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-rw-r--r--fs/fat/.kunitconfig5
-rw-r--r--fs/fat/Kconfig43
-rw-r--r--fs/fat/Makefile3
-rw-r--r--fs/fat/cache.c105
-rw-r--r--fs/fat/dir.c100
-rw-r--r--fs/fat/fat.h102
-rw-r--r--fs/fat/fat_test.c197
-rw-r--r--fs/fat/fatent.c259
-rw-r--r--fs/fat/file.c220
-rw-r--r--fs/fat/inode.c1399
-rw-r--r--fs/fat/misc.c149
-rw-r--r--fs/fat/namei_msdos.c123
-rw-r--r--fs/fat/namei_vfat.c448
-rw-r--r--fs/fat/nfs.c26
14 files changed, 2209 insertions, 970 deletions
diff --git a/fs/fat/.kunitconfig b/fs/fat/.kunitconfig
new file mode 100644
index 000000000000..0a6971dbeccb
--- /dev/null
+++ b/fs/fat/.kunitconfig
@@ -0,0 +1,5 @@
+CONFIG_KUNIT=y
+CONFIG_FAT_FS=y
+CONFIG_MSDOS_FS=y
+CONFIG_VFAT_FS=y
+CONFIG_FAT_KUNIT_TEST=y
diff --git a/fs/fat/Kconfig b/fs/fat/Kconfig
index 182f9ffe2b51..25fae1c83725 100644
--- a/fs/fat/Kconfig
+++ b/fs/fat/Kconfig
@@ -1,6 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
config FAT_FS
tristate
+ select BUFFER_HEAD
select NLS
+ select LEGACY_DIRECT_IO
help
If you want to use one of the FAT-based file systems (the MS-DOS and
VFAT (Windows 95) file systems), then you must say Y or M here
@@ -40,7 +43,7 @@ config MSDOS_FS
they are compressed; to access compressed MSDOS partitions under
Linux, you can either use the DOS emulator DOSEMU, described in the
DOSEMU-HOWTO, available from
- <http://www.tldp.org/docs.html#howto>, or try dmsdosfs in
+ <https://www.tldp.org/docs.html#howto>, or try dmsdosfs in
<ftp://ibiblio.org/pub/Linux/system/filesystems/dosfs/>. If you
intend to use dosemu with a non-compressed MSDOS partition, say Y
here) and MSDOS floppies. This means that file access becomes
@@ -68,7 +71,7 @@ config VFAT_FS
The VFAT support enlarges your kernel by about 10 KB and it only
works if you said Y to the "DOS FAT fs support" above. Please read
- the file <file:Documentation/filesystems/vfat.txt> for details. If
+ the file <file:Documentation/filesystems/vfat.rst> for details. If
unsure, say Y.
To compile this as a module, choose M here: the module will be called
@@ -76,12 +79,12 @@ config VFAT_FS
config FAT_DEFAULT_CODEPAGE
int "Default codepage for FAT"
- depends on MSDOS_FS || VFAT_FS
+ depends on FAT_FS
default 437
help
This option should be set to the codepage of your FAT filesystems.
It can be overridden with the "codepage" mount option.
- See <file:Documentation/filesystems/vfat.txt> for more information.
+ See <file:Documentation/filesystems/vfat.rst> for more information.
config FAT_DEFAULT_IOCHARSET
string "Default iocharset for FAT"
@@ -93,8 +96,36 @@ config FAT_DEFAULT_IOCHARSET
that most of your FAT filesystems use, and can be overridden
with the "iocharset" mount option for FAT filesystems.
Note that "utf8" is not recommended for FAT filesystems.
- If unsure, you shouldn't set "utf8" here.
- See <file:Documentation/filesystems/vfat.txt> for more information.
+ If unsure, you shouldn't set "utf8" here - select the next option
+ instead if you would like to use UTF-8 encoded file names by default.
+ See <file:Documentation/filesystems/vfat.rst> for more information.
Enable any character sets you need in File Systems/Native Language
Support.
+
+config FAT_DEFAULT_UTF8
+ bool "Enable FAT UTF-8 option by default"
+ depends on VFAT_FS
+ default n
+ help
+ Set this if you would like to have "utf8" mount option set
+ by default when mounting FAT filesystems.
+
+ Even if you say Y here can always disable UTF-8 for
+ particular mount by adding "utf8=0" to mount options.
+
+ Say Y if you use UTF-8 encoding for file names, N otherwise.
+
+ See <file:Documentation/filesystems/vfat.rst> for more information.
+
+config FAT_KUNIT_TEST
+ tristate "Unit Tests for FAT filesystems" if !KUNIT_ALL_TESTS
+ depends on KUNIT && FAT_FS
+ default KUNIT_ALL_TESTS
+ help
+ This builds the FAT KUnit tests
+
+ For more information on KUnit and unit tests in general, please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit
+
+ If unsure, say N
diff --git a/fs/fat/Makefile b/fs/fat/Makefile
index 964b634f6667..2b034112690d 100644
--- a/fs/fat/Makefile
+++ b/fs/fat/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
#
# Makefile for the Linux fat filesystem support.
#
@@ -9,3 +10,5 @@ obj-$(CONFIG_MSDOS_FS) += msdos.o
fat-y := cache.o dir.o fatent.o file.o inode.o misc.o nfs.o
vfat-y := namei_vfat.o
msdos-y := namei_msdos.o
+
+obj-$(CONFIG_FAT_KUNIT_TEST) += fat_test.o
diff --git a/fs/fat/cache.c b/fs/fat/cache.c
index 91ad9e1c9441..2af424e200b3 100644
--- a/fs/fat/cache.c
+++ b/fs/fat/cache.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* linux/fs/fat/cache.c
*
@@ -8,9 +9,7 @@
* May 1999. AV. Fixed the bogosity with FAT32 (read "FAT28"). Fscking lusers.
*/
-#include <linux/fs.h>
#include <linux/slab.h>
-#include <linux/buffer_head.h>
#include "fat.h"
/* this must be > 0. */
@@ -48,7 +47,7 @@ int __init fat_cache_init(void)
{
fat_cache_cachep = kmem_cache_create("fat_cache",
sizeof(struct fat_cache),
- 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
+ 0, SLAB_RECLAIM_ACCOUNT,
init_once);
if (fat_cache_cachep == NULL)
return -ENOMEM;
@@ -226,7 +225,8 @@ static inline void cache_init(struct fat_cache_id *cid, int fclus, int dclus)
int fat_get_cluster(struct inode *inode, int cluster, int *fclus, int *dclus)
{
struct super_block *sb = inode->i_sb;
- const int limit = sb->s_maxbytes >> MSDOS_SB(sb)->cluster_bits;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ const int limit = sb->s_maxbytes >> sbi->cluster_bits;
struct fat_entry fatent;
struct fat_cache_id cid;
int nr;
@@ -235,6 +235,12 @@ int fat_get_cluster(struct inode *inode, int cluster, int *fclus, int *dclus)
*fclus = 0;
*dclus = MSDOS_I(inode)->i_start;
+ if (!fat_valid_entry(sbi, *dclus)) {
+ fat_fs_error_ratelimit(sb,
+ "%s: invalid start cluster (i_pos %lld, start %08x)",
+ __func__, MSDOS_I(inode)->i_pos, *dclus);
+ return -EIO;
+ }
if (cluster == 0)
return 0;
@@ -251,9 +257,8 @@ int fat_get_cluster(struct inode *inode, int cluster, int *fclus, int *dclus)
/* prevent the infinite loop of cluster chain */
if (*fclus > limit) {
fat_fs_error_ratelimit(sb,
- "%s: detected the cluster chain loop"
- " (i_pos %lld)", __func__,
- MSDOS_I(inode)->i_pos);
+ "%s: detected the cluster chain loop (i_pos %lld)",
+ __func__, MSDOS_I(inode)->i_pos);
nr = -EIO;
goto out;
}
@@ -263,9 +268,8 @@ int fat_get_cluster(struct inode *inode, int cluster, int *fclus, int *dclus)
goto out;
else if (nr == FAT_ENT_FREE) {
fat_fs_error_ratelimit(sb,
- "%s: invalid cluster chain (i_pos %lld)",
- __func__,
- MSDOS_I(inode)->i_pos);
+ "%s: invalid cluster chain (i_pos %lld)",
+ __func__, MSDOS_I(inode)->i_pos);
nr = -EIO;
goto out;
} else if (nr == FAT_ENT_EOF) {
@@ -303,19 +307,63 @@ static int fat_bmap_cluster(struct inode *inode, int cluster)
return dclus;
}
-int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
- unsigned long *mapped_blocks, int create)
+int fat_get_mapped_cluster(struct inode *inode, sector_t sector,
+ sector_t last_block,
+ unsigned long *mapped_blocks, sector_t *bmap)
{
struct super_block *sb = inode->i_sb;
struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ int cluster, offset;
+
+ cluster = sector >> (sbi->cluster_bits - sb->s_blocksize_bits);
+ offset = sector & (sbi->sec_per_clus - 1);
+ cluster = fat_bmap_cluster(inode, cluster);
+ if (cluster < 0)
+ return cluster;
+ else if (cluster) {
+ *bmap = fat_clus_to_blknr(sbi, cluster) + offset;
+ *mapped_blocks = sbi->sec_per_clus - offset;
+ if (*mapped_blocks > last_block - sector)
+ *mapped_blocks = last_block - sector;
+ }
+
+ return 0;
+}
+
+static int is_exceed_eof(struct inode *inode, sector_t sector,
+ sector_t *last_block, int create)
+{
+ struct super_block *sb = inode->i_sb;
const unsigned long blocksize = sb->s_blocksize;
const unsigned char blocksize_bits = sb->s_blocksize_bits;
+
+ *last_block = (i_size_read(inode) + (blocksize - 1)) >> blocksize_bits;
+ if (sector >= *last_block) {
+ if (!create)
+ return 1;
+
+ /*
+ * ->mmu_private can access on only allocation path.
+ * (caller must hold ->i_mutex)
+ */
+ *last_block = (MSDOS_I(inode)->mmu_private + (blocksize - 1))
+ >> blocksize_bits;
+ if (sector >= *last_block)
+ return 1;
+ }
+
+ return 0;
+}
+
+int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
+ unsigned long *mapped_blocks, int create, bool from_bmap)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
sector_t last_block;
- int cluster, offset;
*phys = 0;
*mapped_blocks = 0;
- if ((sbi->fat_bits != 32) && (inode->i_ino == MSDOS_ROOT_INO)) {
+ if (!is_fat32(sbi) && (inode->i_ino == MSDOS_ROOT_INO)) {
if (sector < (sbi->dir_entries >> sbi->dir_per_block_bits)) {
*phys = sector + sbi->dir_start;
*mapped_blocks = 1;
@@ -323,31 +371,16 @@ int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
return 0;
}
- last_block = (i_size_read(inode) + (blocksize - 1)) >> blocksize_bits;
- if (sector >= last_block) {
- if (!create)
+ if (!from_bmap) {
+ if (is_exceed_eof(inode, sector, &last_block, create))
return 0;
-
- /*
- * ->mmu_private can access on only allocation path.
- * (caller must hold ->i_mutex)
- */
- last_block = (MSDOS_I(inode)->mmu_private + (blocksize - 1))
- >> blocksize_bits;
+ } else {
+ last_block = inode->i_blocks >>
+ (inode->i_sb->s_blocksize_bits - 9);
if (sector >= last_block)
return 0;
}
- cluster = sector >> (sbi->cluster_bits - sb->s_blocksize_bits);
- offset = sector & (sbi->sec_per_clus - 1);
- cluster = fat_bmap_cluster(inode, cluster);
- if (cluster < 0)
- return cluster;
- else if (cluster) {
- *phys = fat_clus_to_blknr(sbi, cluster) + offset;
- *mapped_blocks = sbi->sec_per_clus - offset;
- if (*mapped_blocks > last_block - sector)
- *mapped_blocks = last_block - sector;
- }
- return 0;
+ return fat_get_mapped_cluster(inode, sector, last_block, mapped_blocks,
+ phys);
}
diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index 3963ede84eb0..92b091783966 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/fs/fat/dir.c
*
@@ -13,13 +14,10 @@
* Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de>
*/
-#include <linux/module.h>
#include <linux/slab.h>
-#include <linux/time.h>
-#include <linux/buffer_head.h>
#include <linux/compat.h>
#include <linux/uaccess.h>
-#include <linux/kernel.h>
+#include <linux/iversion.h>
#include "fat.h"
/*
@@ -60,7 +58,7 @@ static inline void fat_dir_readahead(struct inode *dir, sector_t iblock,
if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1)
return;
/* root dir of FAT12/FAT16 */
- if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO))
+ if (!is_fat32(sbi) && (dir->i_ino == MSDOS_ROOT_INO))
return;
bh = sb_find_get_block(sb, phys);
@@ -90,12 +88,10 @@ static int fat__get_entry(struct inode *dir, loff_t *pos,
int err, offset;
next:
- if (*bh)
- brelse(*bh);
-
+ brelse(*bh);
*bh = NULL;
iblock = *pos >> sb->s_blocksize_bits;
- err = fat_bmap(dir, iblock, &phys, &mapped_blocks, 0);
+ err = fat_bmap(dir, iblock, &phys, &mapped_blocks, 0, false);
if (err || !phys)
return -1; /* beyond EOF or error */
@@ -273,6 +269,18 @@ enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, };
/**
* fat_parse_long - Parse extended directory entry.
*
+ * @dir: Pointer to the inode that represents the directory.
+ * @pos: On input, contains the starting position to read from.
+ * On output, updated with the new position.
+ * @bh: Pointer to the buffer head that may be used for reading directory
+ * entries. May be updated.
+ * @de: On input, points to the current directory entry.
+ * On output, points to the next directory entry.
+ * @unicode: Pointer to a buffer where the parsed Unicode long filename will be
+ * stored.
+ * @nr_slots: Pointer to a variable that will store the number of longname
+ * slots found.
+ *
* This function returns zero on success, negative value on error, or one of
* the following:
*
@@ -295,7 +303,6 @@ static int fat_parse_long(struct inode *dir, loff_t *pos,
}
}
parse_long:
- slots = 0;
ds = (struct msdos_dir_slot *)*de;
id = ds->id;
if (!(id & 0x40))
@@ -373,7 +380,9 @@ static int fat_parse_short(struct super_block *sb,
}
memcpy(work, de->name, sizeof(work));
- /* see namei.c, msdos_format_name */
+ /* For an explanation of the special treatment of 0x05 in
+ * filenames, see msdos_format_name in namei_msdos.c
+ */
if (work[0] == 0x05)
work[0] = 0xE5;
@@ -614,9 +623,9 @@ parse_record:
int status = fat_parse_long(inode, &cpos, &bh, &de,
&unicode, &nr_slots);
if (status < 0) {
- ctx->pos = cpos;
+ bh = NULL;
ret = status;
- goto out;
+ goto end_of_dir;
} else if (status == PARSE_INVALID)
goto record_end;
else if (status == PARSE_NOT_LONGNAME)
@@ -658,8 +667,9 @@ parse_record:
fill_len = short_len;
start_filldir:
- if (!fake_offset)
- ctx->pos = cpos - (nr_slots + 1) * sizeof(struct msdos_dir_entry);
+ ctx->pos = cpos - (nr_slots + 1) * sizeof(struct msdos_dir_entry);
+ if (fake_offset && ctx->pos < 2)
+ ctx->pos = 2;
if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME)) {
if (!dir_emit_dot(file, ctx))
@@ -685,14 +695,19 @@ record_end:
fake_offset = 0;
ctx->pos = cpos;
goto get_new;
+
end_of_dir:
- ctx->pos = cpos;
+ if (fake_offset && cpos < 2)
+ ctx->pos = 2;
+ else
+ ctx->pos = cpos;
fill_failed:
brelse(bh);
if (unicode)
__putname(unicode);
out:
mutex_unlock(&sbi->s_lock);
+
return ret;
}
@@ -702,15 +717,16 @@ static int fat_readdir(struct file *file, struct dir_context *ctx)
}
#define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \
-static int func(void *__buf, const char *name, int name_len, \
+static bool func(struct dir_context *ctx, const char *name, int name_len, \
loff_t offset, u64 ino, unsigned int d_type) \
{ \
- struct fat_ioctl_filldir_callback *buf = __buf; \
+ struct fat_ioctl_filldir_callback *buf = \
+ container_of(ctx, struct fat_ioctl_filldir_callback, ctx); \
struct dirent_type __user *d1 = buf->dirent; \
struct dirent_type __user *d2 = d1 + 1; \
\
if (buf->result) \
- return -EINVAL; \
+ return false; \
buf->result++; \
\
if (name != NULL) { \
@@ -718,7 +734,7 @@ static int func(void *__buf, const char *name, int name_len, \
if (name_len >= sizeof(d1->d_name)) \
name_len = sizeof(d1->d_name) - 1; \
\
- if (put_user(0, d2->d_name) || \
+ if (put_user(0, &d2->d_name[0]) || \
put_user(0, &d2->d_reclen) || \
copy_to_user(d1->d_name, name, name_len) || \
put_user(0, d1->d_name + name_len) || \
@@ -746,10 +762,10 @@ static int func(void *__buf, const char *name, int name_len, \
put_user(short_len, &d1->d_reclen)) \
goto efault; \
} \
- return 0; \
+ return true; \
efault: \
buf->result = -EFAULT; \
- return -EFAULT; \
+ return false; \
}
FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, __fat_dirent)
@@ -766,7 +782,7 @@ static int fat_ioctl_readdir(struct inode *inode, struct file *file,
buf.dirent = dirent;
buf.result = 0;
- mutex_lock(&inode->i_mutex);
+ inode_lock_shared(inode);
buf.ctx.pos = file->f_pos;
ret = -ENOENT;
if (!IS_DEADDIR(inode)) {
@@ -774,7 +790,7 @@ static int fat_ioctl_readdir(struct inode *inode, struct file *file,
short_only, both ? &buf : NULL);
file->f_pos = buf.ctx.pos;
}
- mutex_unlock(&inode->i_mutex);
+ inode_unlock_shared(inode);
if (ret >= 0)
ret = buf.result;
return ret;
@@ -800,8 +816,6 @@ static long fat_dir_ioctl(struct file *filp, unsigned int cmd,
return fat_generic_ioctl(filp, cmd, arg);
}
- if (!access_ok(VERIFY_WRITE, d1, sizeof(struct __fat_dirent[2])))
- return -EFAULT;
/*
* Yes, we don't need this put_user() absolutely. However old
* code didn't return the right value. So, app use this value,
@@ -840,8 +854,6 @@ static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd,
return fat_generic_ioctl(filp, cmd, (unsigned long)arg);
}
- if (!access_ok(VERIFY_WRITE, d1, sizeof(struct compat_dirent[2])))
- return -EFAULT;
/*
* Yes, we don't need this put_user() absolutely. However old
* code didn't return the right value. So, app use this value,
@@ -858,7 +870,7 @@ static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd,
const struct file_operations fat_dir_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
- .iterate = fat_readdir,
+ .iterate_shared = fat_readdir,
.unlocked_ioctl = fat_dir_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = fat_compat_dir_ioctl,
@@ -1053,7 +1065,7 @@ int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo)
brelse(bh);
if (err)
return err;
- dir->i_version++;
+ inode_inc_iversion(dir);
if (nr_slots) {
/*
@@ -1068,7 +1080,7 @@ int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo)
}
}
- dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC;
+ fat_truncate_time(dir, NULL, S_ATIME|S_MTIME);
if (IS_DIRSYNC(dir))
(void)fat_sync_inode(dir);
else
@@ -1094,8 +1106,11 @@ static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used,
err = -ENOMEM;
goto error;
}
+ /* Avoid race with userspace read via bdev */
+ lock_buffer(bhs[n]);
memset(bhs[n]->b_data, 0, sb->s_blocksize);
set_buffer_uptodate(bhs[n]);
+ unlock_buffer(bhs[n]);
mark_buffer_dirty_inode(bhs[n], dir);
n++;
@@ -1127,7 +1142,7 @@ error:
return err;
}
-int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
+int fat_alloc_new_dir(struct inode *dir, struct timespec64 *ts)
{
struct super_block *sb = dir->i_sb;
struct msdos_sb_info *sbi = MSDOS_SB(sb);
@@ -1152,6 +1167,8 @@ int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
fat_time_unix2fat(sbi, ts, &time, &date, &time_cs);
de = (struct msdos_dir_entry *)bhs[0]->b_data;
+ /* Avoid race with userspace read via bdev */
+ lock_buffer(bhs[0]);
/* filling the new directory slots ("." and ".." entries) */
memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME);
memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME);
@@ -1174,6 +1191,7 @@ int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
de[0].size = de[1].size = 0;
memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de));
set_buffer_uptodate(bhs[0]);
+ unlock_buffer(bhs[0]);
mark_buffer_dirty_inode(bhs[0], dir);
err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE);
@@ -1191,7 +1209,7 @@ EXPORT_SYMBOL_GPL(fat_alloc_new_dir);
static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
int *nr_cluster, struct msdos_dir_entry **de,
- struct buffer_head **bh, loff_t *i_pos)
+ struct buffer_head **bh)
{
struct super_block *sb = dir->i_sb;
struct msdos_sb_info *sbi = MSDOS_SB(sb);
@@ -1231,11 +1249,14 @@ static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
/* fill the directory entry */
copy = min(size, sb->s_blocksize);
+ /* Avoid race with userspace read via bdev */
+ lock_buffer(bhs[n]);
memcpy(bhs[n]->b_data, slots, copy);
- slots += copy;
- size -= copy;
set_buffer_uptodate(bhs[n]);
+ unlock_buffer(bhs[n]);
mark_buffer_dirty_inode(bhs[n], dir);
+ slots += copy;
+ size -= copy;
if (!size)
break;
n++;
@@ -1248,7 +1269,6 @@ static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
get_bh(bhs[n]);
*bh = bhs[n];
*de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
- *i_pos = fat_make_i_pos(sb, *bh, *de);
/* Second stage: clear the rest of cluster, and write outs */
err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE);
@@ -1275,9 +1295,9 @@ int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
struct super_block *sb = dir->i_sb;
struct msdos_sb_info *sbi = MSDOS_SB(sb);
struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */
- struct msdos_dir_entry *uninitialized_var(de);
+ struct msdos_dir_entry *de;
int err, free_slots, i, nr_bhs;
- loff_t pos, i_pos;
+ loff_t pos;
sinfo->nr_slots = nr_slots;
@@ -1308,7 +1328,7 @@ int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
}
}
if (dir->i_ino == MSDOS_ROOT_INO) {
- if (sbi->fat_bits != 32)
+ if (!is_fat32(sbi))
goto error;
} else if (MSDOS_I(dir)->i_start == 0) {
fat_msg(sb, KERN_ERR, "Corrupted directory (i_pos %lld)",
@@ -1365,7 +1385,7 @@ found:
* add the cluster to dir.
*/
cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster,
- &de, &bh, &i_pos);
+ &de, &bh);
if (cluster < 0) {
err = cluster;
goto error_remove;
diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index 4241e6f39e86..d3e426de5f01 100644
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -1,14 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _FAT_H
#define _FAT_H
#include <linux/buffer_head.h>
-#include <linux/string.h>
#include <linux/nls.h>
-#include <linux/fs.h>
#include <linux/hash.h>
-#include <linux/mutex.h>
#include <linux/ratelimit.h>
#include <linux/msdos_fs.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
/*
* vfat shortname flags
@@ -52,7 +52,9 @@ struct fat_mount_options {
usefree:1, /* Use free_clusters for FAT32 */
tz_set:1, /* Filesystem timestamps' offset set */
rodir:1, /* allow ATTR_RO for directory */
- discard:1; /* Issue discard requests on deletions */
+ discard:1, /* Issue discard requests on deletions */
+ dos1xfloppy:1, /* Assume default BPB for DOS 1.x floppies */
+ debug:1; /* Not currently used */
};
#define FAT_HASH_BITS 8
@@ -65,7 +67,7 @@ struct msdos_sb_info {
unsigned short sec_per_clus; /* sectors/cluster */
unsigned short cluster_bits; /* log2(cluster_size) */
unsigned int cluster_size; /* cluster size */
- unsigned char fats, fat_bits; /* number of FATs, FAT bits (12 or 16) */
+ unsigned char fats, fat_bits; /* number of FATs, FAT bits (12,16 or 32) */
unsigned short fat_start;
unsigned long fat_length; /* FAT start & length (sec.) */
unsigned long dir_start;
@@ -89,7 +91,7 @@ struct msdos_sb_info {
unsigned int vol_id; /*volume ID*/
int fatent_shift;
- struct fatent_operations *fatent_ops;
+ const struct fatent_operations *fatent_ops;
struct inode *fat_inode;
struct inode *fsinfo_inode;
@@ -102,6 +104,7 @@ struct msdos_sb_info {
struct hlist_head dir_hashtable[FAT_HASH_SIZE];
unsigned int dirty; /* fs state before mount */
+ struct rcu_head rcu;
};
#define FAT_CACHE_VALID 0 /* special case for valid cache */
@@ -126,6 +129,7 @@ struct msdos_inode_info {
struct hlist_node i_fat_hash; /* hash by i_location */
struct hlist_node i_dir_hash; /* hash by i_logstart */
struct rw_semaphore truncate_lock; /* protect bmap against truncate */
+ struct timespec64 i_crtime; /* File creation (birth) time */
struct inode vfs_inode;
};
@@ -142,6 +146,34 @@ static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb)
return sb->s_fs_info;
}
+/*
+ * Functions that determine the variant of the FAT file system (i.e.,
+ * whether this is FAT12, FAT16 or FAT32.
+ */
+static inline bool is_fat12(const struct msdos_sb_info *sbi)
+{
+ return sbi->fat_bits == 12;
+}
+
+static inline bool is_fat16(const struct msdos_sb_info *sbi)
+{
+ return sbi->fat_bits == 16;
+}
+
+static inline bool is_fat32(const struct msdos_sb_info *sbi)
+{
+ return sbi->fat_bits == 32;
+}
+
+/* Maximum number of clusters */
+static inline u32 max_fat(struct super_block *sb)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+
+ return is_fat32(sbi) ? MAX_FAT32 :
+ is_fat16(sbi) ? MAX_FAT16 : MAX_FAT12;
+}
+
static inline struct msdos_inode_info *MSDOS_I(struct inode *inode)
{
return container_of(inode, struct msdos_inode_info, vfs_inode);
@@ -257,7 +289,7 @@ static inline int fat_get_start(const struct msdos_sb_info *sbi,
const struct msdos_dir_entry *de)
{
int cluster = le16_to_cpu(de->start);
- if (sbi->fat_bits == 32)
+ if (is_fat32(sbi))
cluster |= (le16_to_cpu(de->starthi) << 16);
return cluster;
}
@@ -286,8 +318,11 @@ static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len)
extern void fat_cache_inval_inode(struct inode *inode);
extern int fat_get_cluster(struct inode *inode, int cluster,
int *fclus, int *dclus);
+extern int fat_get_mapped_cluster(struct inode *inode, sector_t sector,
+ sector_t last_block,
+ unsigned long *mapped_blocks, sector_t *bmap);
extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
- unsigned long *mapped_blocks, int create);
+ unsigned long *mapped_blocks, int create, bool from_bmap);
/* fat/dir.c */
extern const struct file_operations fat_dir_operations;
@@ -301,7 +336,7 @@ extern int fat_scan_logstart(struct inode *dir, int i_logstart,
struct fat_slot_info *sinfo);
extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
struct msdos_dir_entry **de);
-extern int fat_alloc_new_dir(struct inode *dir, struct timespec *ts);
+extern int fat_alloc_new_dir(struct inode *dir, struct timespec64 *ts);
extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
struct fat_slot_info *sinfo);
extern int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo);
@@ -345,6 +380,11 @@ static inline void fatent_brelse(struct fat_entry *fatent)
fatent->fat_inode = NULL;
}
+static inline bool fat_valid_entry(struct msdos_sb_info *sbi, int entry)
+{
+ return FAT_START_ENT <= entry && entry < sbi->max_cluster;
+}
+
extern void fat_ent_access_init(struct super_block *sb);
extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent,
int entry);
@@ -354,36 +394,50 @@ extern int fat_alloc_clusters(struct inode *inode, int *cluster,
int nr_cluster);
extern int fat_free_clusters(struct inode *inode, int cluster);
extern int fat_count_free_clusters(struct super_block *sb);
+extern int fat_trim_fs(struct inode *inode, struct fstrim_range *range);
/* fat/file.c */
extern long fat_generic_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg);
extern const struct file_operations fat_file_operations;
extern const struct inode_operations fat_file_inode_operations;
-extern int fat_setattr(struct dentry *dentry, struct iattr *attr);
+extern int fat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
+ struct iattr *attr);
extern void fat_truncate_blocks(struct inode *inode, loff_t offset);
-extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry,
- struct kstat *stat);
+extern int fat_getattr(struct mnt_idmap *idmap,
+ const struct path *path, struct kstat *stat,
+ u32 request_mask, unsigned int flags);
extern int fat_file_fsync(struct file *file, loff_t start, loff_t end,
int datasync);
/* fat/inode.c */
+extern int fat_block_truncate_page(struct inode *inode, loff_t from);
extern void fat_attach(struct inode *inode, loff_t i_pos);
extern void fat_detach(struct inode *inode);
extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos);
extern struct inode *fat_build_inode(struct super_block *sb,
struct msdos_dir_entry *de, loff_t i_pos);
extern int fat_sync_inode(struct inode *inode);
-extern int fat_fill_super(struct super_block *sb, void *data, int silent,
- int isvfat, void (*setup)(struct super_block *));
+extern int fat_fill_super(struct super_block *sb, struct fs_context *fc,
+ void (*setup)(struct super_block *));
extern int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de);
extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
struct inode *i2);
+
+extern const struct fs_parameter_spec fat_param_spec[];
+int fat_init_fs_context(struct fs_context *fc, bool is_vfat);
+void fat_free_fc(struct fs_context *fc);
+
+int fat_parse_param(struct fs_context *fc, struct fs_parameter *param,
+ bool is_vfat);
+int fat_reconfigure(struct fs_context *fc);
+
static inline unsigned long fat_dir_hash(int logstart)
{
return hash_32(logstart, FAT_HASH_BITS);
}
+extern int fat_add_cluster(struct inode *inode);
/* fat/misc.c */
extern __printf(3, 4) __cold
@@ -392,8 +446,15 @@ void __fat_fs_error(struct super_block *sb, int report, const char *fmt, ...);
__fat_fs_error(sb, 1, fmt , ## args)
#define fat_fs_error_ratelimit(sb, fmt, args...) \
__fat_fs_error(sb, __ratelimit(&MSDOS_SB(sb)->ratelimit), fmt , ## args)
+
+#define FAT_PRINTK_PREFIX "%sFAT-fs (%s): "
+#define fat_msg(sb, level, fmt, args...) \
+do { \
+ printk_index_subsys_emit(FAT_PRINTK_PREFIX, level, fmt, ##args);\
+ _fat_msg(sb, level, fmt, ##args); \
+} while (0)
__printf(3, 4) __cold
-void fat_msg(struct super_block *sb, const char *level, const char *fmt, ...);
+void _fat_msg(struct super_block *sb, const char *level, const char *fmt, ...);
#define fat_msg_ratelimit(sb, level, fmt, args...) \
do { \
if (__ratelimit(&MSDOS_SB(sb)->ratelimit)) \
@@ -401,10 +462,17 @@ void fat_msg(struct super_block *sb, const char *level, const char *fmt, ...);
} while (0)
extern int fat_clusters_flush(struct super_block *sb);
extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
-extern void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts,
+extern void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec64 *ts,
__le16 __time, __le16 __date, u8 time_cs);
-extern void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts,
+extern void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec64 *ts,
__le16 *time, __le16 *date, u8 *time_cs);
+extern struct timespec64 fat_truncate_atime(const struct msdos_sb_info *sbi,
+ const struct timespec64 *ts);
+extern struct timespec64 fat_truncate_mtime(const struct msdos_sb_info *sbi,
+ const struct timespec64 *ts);
+extern int fat_truncate_time(struct inode *inode, struct timespec64 *now,
+ int flags);
+extern int fat_update_time(struct inode *inode, int flags);
extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs);
int fat_cache_init(void);
diff --git a/fs/fat/fat_test.c b/fs/fat/fat_test.c
new file mode 100644
index 000000000000..1f0062659067
--- /dev/null
+++ b/fs/fat/fat_test.c
@@ -0,0 +1,197 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KUnit tests for FAT filesystems.
+ *
+ * Copyright (C) 2020 Google LLC.
+ * Author: David Gow <davidgow@google.com>
+ */
+
+#include <kunit/test.h>
+
+#include "fat.h"
+
+static void fat_checksum_test(struct kunit *test)
+{
+ /* With no extension. */
+ KUNIT_EXPECT_EQ(test, fat_checksum("VMLINUX "), (u8)44);
+ /* With 3-letter extension. */
+ KUNIT_EXPECT_EQ(test, fat_checksum("README TXT"), (u8)115);
+ /* With short (1-letter) extension. */
+ KUNIT_EXPECT_EQ(test, fat_checksum("ABCDEFGHA "), (u8)98);
+}
+
+struct fat_timestamp_testcase {
+ const char *name;
+ struct timespec64 ts;
+ __le16 time;
+ __le16 date;
+ u8 cs;
+ int time_offset;
+};
+
+static struct fat_timestamp_testcase time_test_cases[] = {
+ {
+ .name = "Earliest possible UTC (1980-01-01 00:00:00)",
+ .ts = {.tv_sec = 315532800LL, .tv_nsec = 0L},
+ .time = cpu_to_le16(0),
+ .date = cpu_to_le16(33),
+ .cs = 0,
+ .time_offset = 0,
+ },
+ {
+ .name = "Latest possible UTC (2107-12-31 23:59:58)",
+ .ts = {.tv_sec = 4354819198LL, .tv_nsec = 0L},
+ .time = cpu_to_le16(49021),
+ .date = cpu_to_le16(65439),
+ .cs = 0,
+ .time_offset = 0,
+ },
+ {
+ .name = "Earliest possible (UTC-11) (== 1979-12-31 13:00:00 UTC)",
+ .ts = {.tv_sec = 315493200LL, .tv_nsec = 0L},
+ .time = cpu_to_le16(0),
+ .date = cpu_to_le16(33),
+ .cs = 0,
+ .time_offset = 11 * 60,
+ },
+ {
+ .name = "Latest possible (UTC+11) (== 2108-01-01 10:59:58 UTC)",
+ .ts = {.tv_sec = 4354858798LL, .tv_nsec = 0L},
+ .time = cpu_to_le16(49021),
+ .date = cpu_to_le16(65439),
+ .cs = 0,
+ .time_offset = -11 * 60,
+ },
+ {
+ .name = "Leap Day / Year (1996-02-29 00:00:00)",
+ .ts = {.tv_sec = 825552000LL, .tv_nsec = 0L},
+ .time = cpu_to_le16(0),
+ .date = cpu_to_le16(8285),
+ .cs = 0,
+ .time_offset = 0,
+ },
+ {
+ .name = "Year 2000 is leap year (2000-02-29 00:00:00)",
+ .ts = {.tv_sec = 951782400LL, .tv_nsec = 0L},
+ .time = cpu_to_le16(0),
+ .date = cpu_to_le16(10333),
+ .cs = 0,
+ .time_offset = 0,
+ },
+ {
+ .name = "Year 2100 not leap year (2100-03-01 00:00:00)",
+ .ts = {.tv_sec = 4107542400LL, .tv_nsec = 0L},
+ .time = cpu_to_le16(0),
+ .date = cpu_to_le16(61537),
+ .cs = 0,
+ .time_offset = 0,
+ },
+ {
+ .name = "Leap year + timezone UTC+1 (== 2004-02-29 00:30:00 UTC)",
+ .ts = {.tv_sec = 1078014600LL, .tv_nsec = 0L},
+ .time = cpu_to_le16(48064),
+ .date = cpu_to_le16(12380),
+ .cs = 0,
+ .time_offset = -60,
+ },
+ {
+ .name = "Leap year + timezone UTC-1 (== 2004-02-29 23:30:00 UTC)",
+ .ts = {.tv_sec = 1078097400LL, .tv_nsec = 0L},
+ .time = cpu_to_le16(960),
+ .date = cpu_to_le16(12385),
+ .cs = 0,
+ .time_offset = 60,
+ },
+ {
+ .name = "VFAT odd-second resolution (1999-12-31 23:59:59)",
+ .ts = {.tv_sec = 946684799LL, .tv_nsec = 0L},
+ .time = cpu_to_le16(49021),
+ .date = cpu_to_le16(10143),
+ .cs = 100,
+ .time_offset = 0,
+ },
+ {
+ .name = "VFAT 10ms resolution (1980-01-01 00:00:00:0010)",
+ .ts = {.tv_sec = 315532800LL, .tv_nsec = 10000000L},
+ .time = cpu_to_le16(0),
+ .date = cpu_to_le16(33),
+ .cs = 1,
+ .time_offset = 0,
+ },
+};
+
+static void time_testcase_desc(struct fat_timestamp_testcase *t,
+ char *desc)
+{
+ strscpy(desc, t->name, KUNIT_PARAM_DESC_SIZE);
+}
+
+KUNIT_ARRAY_PARAM(fat_time, time_test_cases, time_testcase_desc);
+
+static void fat_time_fat2unix_test(struct kunit *test)
+{
+ static struct msdos_sb_info fake_sb;
+ struct timespec64 ts;
+ struct fat_timestamp_testcase *testcase =
+ (struct fat_timestamp_testcase *)test->param_value;
+
+ fake_sb.options.tz_set = 1;
+ fake_sb.options.time_offset = testcase->time_offset;
+
+ fat_time_fat2unix(&fake_sb, &ts,
+ testcase->time,
+ testcase->date,
+ testcase->cs);
+ KUNIT_EXPECT_EQ_MSG(test,
+ testcase->ts.tv_sec,
+ ts.tv_sec,
+ "Timestamp mismatch (seconds)\n");
+ KUNIT_EXPECT_EQ_MSG(test,
+ testcase->ts.tv_nsec,
+ ts.tv_nsec,
+ "Timestamp mismatch (nanoseconds)\n");
+}
+
+static void fat_time_unix2fat_test(struct kunit *test)
+{
+ static struct msdos_sb_info fake_sb;
+ __le16 date, time;
+ u8 cs;
+ struct fat_timestamp_testcase *testcase =
+ (struct fat_timestamp_testcase *)test->param_value;
+
+ fake_sb.options.tz_set = 1;
+ fake_sb.options.time_offset = testcase->time_offset;
+
+ fat_time_unix2fat(&fake_sb, &testcase->ts,
+ &time, &date, &cs);
+ KUNIT_EXPECT_EQ_MSG(test,
+ le16_to_cpu(testcase->time),
+ le16_to_cpu(time),
+ "Time mismatch\n");
+ KUNIT_EXPECT_EQ_MSG(test,
+ le16_to_cpu(testcase->date),
+ le16_to_cpu(date),
+ "Date mismatch\n");
+ KUNIT_EXPECT_EQ_MSG(test,
+ testcase->cs,
+ cs,
+ "Centisecond mismatch\n");
+}
+
+static struct kunit_case fat_test_cases[] = {
+ KUNIT_CASE(fat_checksum_test),
+ KUNIT_CASE_PARAM(fat_time_fat2unix_test, fat_time_gen_params),
+ KUNIT_CASE_PARAM(fat_time_unix2fat_test, fat_time_gen_params),
+ {},
+};
+
+static struct kunit_suite fat_test_suite = {
+ .name = "fat_test",
+ .test_cases = fat_test_cases,
+};
+
+kunit_test_suites(&fat_test_suite);
+
+MODULE_DESCRIPTION("KUnit tests for FAT filesystems");
+MODULE_LICENSE("GPL v2");
diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
index 260705c58062..a7061c2ad8e4 100644
--- a/fs/fat/fatent.c
+++ b/fs/fat/fatent.c
@@ -1,12 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2004, OGAWA Hirofumi
- * Released under GPL v2.
*/
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/msdos_fs.h>
#include <linux/blkdev.h>
+#include <linux/sched/signal.h>
+#include <linux/backing-dev-defs.h>
#include "fat.h"
struct fatent_operations {
@@ -26,7 +25,7 @@ static void fat12_ent_blocknr(struct super_block *sb, int entry,
{
struct msdos_sb_info *sbi = MSDOS_SB(sb);
int bytes = entry + (entry >> 1);
- WARN_ON(entry < FAT_START_ENT || sbi->max_cluster <= entry);
+ WARN_ON(!fat_valid_entry(sbi, entry));
*offset = bytes & (sb->s_blocksize - 1);
*blocknr = sbi->fat_start + (bytes >> sb->s_blocksize_bits);
}
@@ -36,7 +35,7 @@ static void fat_ent_blocknr(struct super_block *sb, int entry,
{
struct msdos_sb_info *sbi = MSDOS_SB(sb);
int bytes = (entry << sbi->fatent_shift);
- WARN_ON(entry < FAT_START_ENT || sbi->max_cluster <= entry);
+ WARN_ON(!fat_valid_entry(sbi, entry));
*offset = bytes & (sb->s_blocksize - 1);
*blocknr = sbi->fat_start + (bytes >> sb->s_blocksize_bits);
}
@@ -95,21 +94,22 @@ static int fat12_ent_bread(struct super_block *sb, struct fat_entry *fatent,
err_brelse:
brelse(bhs[0]);
err:
- fat_msg(sb, KERN_ERR, "FAT read failed (blocknr %llu)", (llu)blocknr);
+ fat_msg_ratelimit(sb, KERN_ERR, "FAT read failed (blocknr %llu)",
+ (llu)blocknr);
return -EIO;
}
static int fat_ent_bread(struct super_block *sb, struct fat_entry *fatent,
int offset, sector_t blocknr)
{
- struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
+ const struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
WARN_ON(blocknr < MSDOS_SB(sb)->fat_start);
fatent->fat_inode = MSDOS_SB(sb)->fat_inode;
fatent->bhs[0] = sb_bread(sb, blocknr);
if (!fatent->bhs[0]) {
- fat_msg(sb, KERN_ERR, "FAT read failed (blocknr %llu)",
- (llu)blocknr);
+ fat_msg_ratelimit(sb, KERN_ERR, "FAT read failed (blocknr %llu)",
+ (llu)blocknr);
return -EIO;
}
fatent->nr_bhs = 1;
@@ -249,7 +249,7 @@ static int fat32_ent_next(struct fat_entry *fatent)
return 0;
}
-static struct fatent_operations fat12_ops = {
+static const struct fatent_operations fat12_ops = {
.ent_blocknr = fat12_ent_blocknr,
.ent_set_ptr = fat12_ent_set_ptr,
.ent_bread = fat12_ent_bread,
@@ -258,7 +258,7 @@ static struct fatent_operations fat12_ops = {
.ent_next = fat12_ent_next,
};
-static struct fatent_operations fat16_ops = {
+static const struct fatent_operations fat16_ops = {
.ent_blocknr = fat_ent_blocknr,
.ent_set_ptr = fat16_ent_set_ptr,
.ent_bread = fat_ent_bread,
@@ -267,7 +267,7 @@ static struct fatent_operations fat16_ops = {
.ent_next = fat16_ent_next,
};
-static struct fatent_operations fat32_ops = {
+static const struct fatent_operations fat32_ops = {
.ent_blocknr = fat_ent_blocknr,
.ent_set_ptr = fat32_ent_set_ptr,
.ent_bread = fat_ent_bread,
@@ -292,19 +292,17 @@ void fat_ent_access_init(struct super_block *sb)
mutex_init(&sbi->fat_lock);
- switch (sbi->fat_bits) {
- case 32:
+ if (is_fat32(sbi)) {
sbi->fatent_shift = 2;
sbi->fatent_ops = &fat32_ops;
- break;
- case 16:
+ } else if (is_fat16(sbi)) {
sbi->fatent_shift = 1;
sbi->fatent_ops = &fat16_ops;
- break;
- case 12:
+ } else if (is_fat12(sbi)) {
sbi->fatent_shift = -1;
sbi->fatent_ops = &fat12_ops;
- break;
+ } else {
+ fat_fs_error(sb, "invalid FAT variant, %u bits", sbi->fat_bits);
}
}
@@ -312,7 +310,7 @@ static void mark_fsinfo_dirty(struct super_block *sb)
{
struct msdos_sb_info *sbi = MSDOS_SB(sb);
- if (sb->s_flags & MS_RDONLY || sbi->fat_bits != 32)
+ if (sb_rdonly(sb) || !is_fat32(sbi))
return;
__mark_inode_dirty(sbi->fsinfo_inode, I_DIRTY_SYNC);
@@ -323,13 +321,13 @@ static inline int fat_ent_update_ptr(struct super_block *sb,
int offset, sector_t blocknr)
{
struct msdos_sb_info *sbi = MSDOS_SB(sb);
- struct fatent_operations *ops = sbi->fatent_ops;
+ const struct fatent_operations *ops = sbi->fatent_ops;
struct buffer_head **bhs = fatent->bhs;
/* Is this fatent's blocks including this entry? */
if (!fatent->nr_bhs || bhs[0]->b_blocknr != blocknr)
return 0;
- if (sbi->fat_bits == 12) {
+ if (is_fat12(sbi)) {
if ((offset + 1) < sb->s_blocksize) {
/* This entry is on bhs[0]. */
if (fatent->nr_bhs == 2) {
@@ -352,13 +350,13 @@ int fat_ent_read(struct inode *inode, struct fat_entry *fatent, int entry)
{
struct super_block *sb = inode->i_sb;
struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
- struct fatent_operations *ops = sbi->fatent_ops;
+ const struct fatent_operations *ops = sbi->fatent_ops;
int err, offset;
sector_t blocknr;
- if (entry < FAT_START_ENT || sbi->max_cluster <= entry) {
+ if (!fat_valid_entry(sbi, entry)) {
fatent_brelse(fatent);
- fat_fs_error(sb, "invalid access to FAT (entry 0x%08x)", entry);
+ fat_fs_error_ratelimit(sb, "invalid access to FAT (entry 0x%08x)", entry);
return -EIO;
}
@@ -392,10 +390,13 @@ static int fat_mirror_bhs(struct super_block *sb, struct buffer_head **bhs,
err = -ENOMEM;
goto error;
}
+ /* Avoid race with userspace read via bdev */
+ lock_buffer(c_bh);
memcpy(c_bh->b_data, bhs[n]->b_data, sb->s_blocksize);
set_buffer_uptodate(c_bh);
+ unlock_buffer(c_bh);
mark_buffer_dirty_inode(c_bh, sbi->fat_inode);
- if (sb->s_flags & MS_SYNCHRONOUS)
+ if (sb->s_flags & SB_SYNCHRONOUS)
err = sync_dirty_buffer(c_bh);
brelse(c_bh);
if (err)
@@ -410,7 +411,7 @@ int fat_ent_write(struct inode *inode, struct fat_entry *fatent,
int new, int wait)
{
struct super_block *sb = inode->i_sb;
- struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
+ const struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
int err;
ops->ent_put(fatent, new);
@@ -435,7 +436,7 @@ static inline int fat_ent_next(struct msdos_sb_info *sbi,
static inline int fat_ent_read_block(struct super_block *sb,
struct fat_entry *fatent)
{
- struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
+ const struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
sector_t blocknr;
int offset;
@@ -466,7 +467,7 @@ int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster)
{
struct super_block *sb = inode->i_sb;
struct msdos_sb_info *sbi = MSDOS_SB(sb);
- struct fatent_operations *ops = sbi->fatent_ops;
+ const struct fatent_operations *ops = sbi->fatent_ops;
struct fat_entry fatent, prev_ent;
struct buffer_head *bhs[MAX_BUF_PER_PAGE];
int i, count, err, nr_bhs, idx_clus;
@@ -554,7 +555,7 @@ int fat_free_clusters(struct inode *inode, int cluster)
{
struct super_block *sb = inode->i_sb;
struct msdos_sb_info *sbi = MSDOS_SB(sb);
- struct fatent_operations *ops = sbi->fatent_ops;
+ const struct fatent_operations *ops = sbi->fatent_ops;
struct fat_entry fatent;
struct buffer_head *bhs[MAX_BUF_PER_PAGE];
int i, err, nr_bhs;
@@ -600,7 +601,7 @@ int fat_free_clusters(struct inode *inode, int cluster)
}
if (nr_bhs + fatent.nr_bhs > MAX_BUF_PER_PAGE) {
- if (sb->s_flags & MS_SYNCHRONOUS) {
+ if (sb->s_flags & SB_SYNCHRONOUS) {
err = fat_sync_bhs(bhs, nr_bhs);
if (err)
goto error;
@@ -615,7 +616,7 @@ int fat_free_clusters(struct inode *inode, int cluster)
fat_collect_bhs(bhs, &nr_bhs, &fatent);
} while (cluster != FAT_ENT_EOF);
- if (sb->s_flags & MS_SYNCHRONOUS) {
+ if (sb->s_flags & SB_SYNCHRONOUS) {
err = fat_sync_bhs(bhs, nr_bhs);
if (err)
goto error;
@@ -633,48 +634,104 @@ error:
}
EXPORT_SYMBOL_GPL(fat_free_clusters);
-/* 128kb is the whole sectors for FAT12 and FAT16 */
-#define FAT_READA_SIZE (128 * 1024)
+struct fatent_ra {
+ sector_t cur;
+ sector_t limit;
+
+ unsigned int ra_blocks;
+ sector_t ra_advance;
+ sector_t ra_next;
+ sector_t ra_limit;
+};
-static void fat_ent_reada(struct super_block *sb, struct fat_entry *fatent,
- unsigned long reada_blocks)
+static void fat_ra_init(struct super_block *sb, struct fatent_ra *ra,
+ struct fat_entry *fatent, int ent_limit)
{
- struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
- sector_t blocknr;
- int i, offset;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ const struct fatent_operations *ops = sbi->fatent_ops;
+ sector_t blocknr, block_end;
+ int offset;
+ /*
+ * This is the sequential read, so ra_pages * 2 (but try to
+ * align the optimal hardware IO size).
+ * [BTW, 128kb covers the whole sectors for FAT12 and FAT16]
+ */
+ unsigned long ra_pages = sb->s_bdi->ra_pages;
+ unsigned int reada_blocks;
+
+ if (fatent->entry >= ent_limit)
+ return;
+ if (ra_pages > sb->s_bdi->io_pages)
+ ra_pages = rounddown(ra_pages, sb->s_bdi->io_pages);
+ reada_blocks = ra_pages << (PAGE_SHIFT - sb->s_blocksize_bits + 1);
+
+ /* Initialize the range for sequential read */
ops->ent_blocknr(sb, fatent->entry, &offset, &blocknr);
+ ops->ent_blocknr(sb, ent_limit - 1, &offset, &block_end);
+ ra->cur = 0;
+ ra->limit = (block_end + 1) - blocknr;
+
+ /* Advancing the window at half size */
+ ra->ra_blocks = reada_blocks >> 1;
+ ra->ra_advance = ra->cur;
+ ra->ra_next = ra->cur;
+ ra->ra_limit = ra->cur + min_t(sector_t, reada_blocks, ra->limit);
+}
- for (i = 0; i < reada_blocks; i++)
- sb_breadahead(sb, blocknr + i);
+/* Assuming to be called before reading a new block (increments ->cur). */
+static void fat_ent_reada(struct super_block *sb, struct fatent_ra *ra,
+ struct fat_entry *fatent)
+{
+ if (ra->ra_next >= ra->ra_limit)
+ return;
+
+ if (ra->cur >= ra->ra_advance) {
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ const struct fatent_operations *ops = sbi->fatent_ops;
+ struct blk_plug plug;
+ sector_t blocknr, diff;
+ int offset;
+
+ ops->ent_blocknr(sb, fatent->entry, &offset, &blocknr);
+
+ diff = blocknr - ra->cur;
+ blk_start_plug(&plug);
+ /*
+ * FIXME: we would want to directly use the bio with
+ * pages to reduce the number of segments.
+ */
+ for (; ra->ra_next < ra->ra_limit; ra->ra_next++)
+ sb_breadahead(sb, ra->ra_next + diff);
+ blk_finish_plug(&plug);
+
+ /* Advance the readahead window */
+ ra->ra_advance += ra->ra_blocks;
+ ra->ra_limit += min_t(sector_t,
+ ra->ra_blocks, ra->limit - ra->ra_limit);
+ }
+ ra->cur++;
}
int fat_count_free_clusters(struct super_block *sb)
{
struct msdos_sb_info *sbi = MSDOS_SB(sb);
- struct fatent_operations *ops = sbi->fatent_ops;
+ const struct fatent_operations *ops = sbi->fatent_ops;
struct fat_entry fatent;
- unsigned long reada_blocks, reada_mask, cur_block;
+ struct fatent_ra fatent_ra;
int err = 0, free;
lock_fat(sbi);
if (sbi->free_clusters != -1 && sbi->free_clus_valid)
goto out;
- reada_blocks = FAT_READA_SIZE >> sb->s_blocksize_bits;
- reada_mask = reada_blocks - 1;
- cur_block = 0;
-
free = 0;
fatent_init(&fatent);
fatent_set_entry(&fatent, FAT_START_ENT);
+ fat_ra_init(sb, &fatent_ra, &fatent, sbi->max_cluster);
while (fatent.entry < sbi->max_cluster) {
/* readahead of fat blocks */
- if ((cur_block & reada_mask) == 0) {
- unsigned long rest = sbi->fat_length - cur_block;
- fat_ent_reada(sb, &fatent, min(reada_blocks, rest));
- }
- cur_block++;
+ fat_ent_reada(sb, &fatent_ra, &fatent);
err = fat_ent_read_block(sb, &fatent);
if (err)
@@ -684,6 +741,7 @@ int fat_count_free_clusters(struct super_block *sb)
if (ops->ent_get(&fatent) == FAT_ENT_FREE)
free++;
} while (fat_ent_next(sbi, &fatent));
+ cond_resched();
}
sbi->free_clusters = free;
sbi->free_clus_valid = 1;
@@ -693,3 +751,98 @@ out:
unlock_fat(sbi);
return err;
}
+
+static int fat_trim_clusters(struct super_block *sb, u32 clus, u32 nr_clus)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ return sb_issue_discard(sb, fat_clus_to_blknr(sbi, clus),
+ nr_clus * sbi->sec_per_clus, GFP_NOFS, 0);
+}
+
+int fat_trim_fs(struct inode *inode, struct fstrim_range *range)
+{
+ struct super_block *sb = inode->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ const struct fatent_operations *ops = sbi->fatent_ops;
+ struct fat_entry fatent;
+ struct fatent_ra fatent_ra;
+ u64 ent_start, ent_end, minlen, trimmed = 0;
+ u32 free = 0;
+ int err = 0;
+
+ /*
+ * FAT data is organized as clusters, trim at the granulary of cluster.
+ *
+ * fstrim_range is in byte, convert values to cluster index.
+ * Treat sectors before data region as all used, not to trim them.
+ */
+ ent_start = max_t(u64, range->start>>sbi->cluster_bits, FAT_START_ENT);
+ ent_end = ent_start + (range->len >> sbi->cluster_bits) - 1;
+ minlen = range->minlen >> sbi->cluster_bits;
+
+ if (ent_start >= sbi->max_cluster || range->len < sbi->cluster_size)
+ return -EINVAL;
+ if (ent_end >= sbi->max_cluster)
+ ent_end = sbi->max_cluster - 1;
+
+ fatent_init(&fatent);
+ lock_fat(sbi);
+ fatent_set_entry(&fatent, ent_start);
+ fat_ra_init(sb, &fatent_ra, &fatent, ent_end + 1);
+ while (fatent.entry <= ent_end) {
+ /* readahead of fat blocks */
+ fat_ent_reada(sb, &fatent_ra, &fatent);
+
+ err = fat_ent_read_block(sb, &fatent);
+ if (err)
+ goto error;
+ do {
+ if (ops->ent_get(&fatent) == FAT_ENT_FREE) {
+ free++;
+ } else if (free) {
+ if (free >= minlen) {
+ u32 clus = fatent.entry - free;
+
+ err = fat_trim_clusters(sb, clus, free);
+ if (err && err != -EOPNOTSUPP)
+ goto error;
+ if (!err)
+ trimmed += free;
+ err = 0;
+ }
+ free = 0;
+ }
+ } while (fat_ent_next(sbi, &fatent) && fatent.entry <= ent_end);
+
+ if (fatal_signal_pending(current)) {
+ err = -ERESTARTSYS;
+ goto error;
+ }
+
+ if (need_resched()) {
+ fatent_brelse(&fatent);
+ unlock_fat(sbi);
+ cond_resched();
+ lock_fat(sbi);
+ }
+ }
+ /* handle scenario when tail entries are all free */
+ if (free && free >= minlen) {
+ u32 clus = fatent.entry - free;
+
+ err = fat_trim_clusters(sb, clus, free);
+ if (err && err != -EOPNOTSUPP)
+ goto error;
+ if (!err)
+ trimmed += free;
+ err = 0;
+ }
+
+error:
+ fatent_brelse(&fatent);
+ unlock_fat(sbi);
+
+ range->len = trimmed << sbi->cluster_bits;
+
+ return err;
+}
diff --git a/fs/fat/file.c b/fs/fat/file.c
index 9b104f543056..4fc49a614fb8 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/fs/fat/file.c
*
@@ -10,22 +11,23 @@
#include <linux/module.h>
#include <linux/compat.h>
#include <linux/mount.h>
-#include <linux/time.h>
-#include <linux/buffer_head.h>
-#include <linux/writeback.h>
-#include <linux/backing-dev.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/fsnotify.h>
#include <linux/security.h>
+#include <linux/falloc.h>
#include "fat.h"
+static long fat_fallocate(struct file *file, int mode,
+ loff_t offset, loff_t len);
+
static int fat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
{
u32 attr;
- mutex_lock(&inode->i_mutex);
+ inode_lock_shared(inode);
attr = fat_make_attrs(inode);
- mutex_unlock(&inode->i_mutex);
+ inode_unlock_shared(inode);
return put_user(attr, user_attr);
}
@@ -46,7 +48,7 @@ static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
err = mnt_want_write_file(file);
if (err)
goto out;
- mutex_lock(&inode->i_mutex);
+ inode_lock(inode);
/*
* ATTR_VOLUME and ATTR_DIR cannot be changed; this also
@@ -62,7 +64,7 @@ static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
/* Equivalent to a chmod() */
ia.ia_valid = ATTR_MODE | ATTR_CTIME;
- ia.ia_ctime = current_fs_time(inode->i_sb);
+ ia.ia_ctime = current_time(inode);
if (is_dir)
ia.ia_mode = fat_make_mode(sbi, attr, S_IRWXUGO);
else {
@@ -88,12 +90,13 @@ static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
* out the RO attribute for checking by the security
* module, just because it maps to a file mode.
*/
- err = security_inode_setattr(file->f_path.dentry, &ia);
+ err = security_inode_setattr(file_mnt_idmap(file),
+ file->f_path.dentry, &ia);
if (err)
goto out_unlock_inode;
/* This MUST be done before doing anything irreversible... */
- err = fat_setattr(file->f_path.dentry, &ia);
+ err = fat_setattr(file_mnt_idmap(file), file->f_path.dentry, &ia);
if (err)
goto out_unlock_inode;
@@ -108,7 +111,7 @@ static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
fat_save_attrs(inode, attr);
mark_inode_dirty(inode);
out_unlock_inode:
- mutex_unlock(&inode->i_mutex);
+ inode_unlock(inode);
mnt_drop_write_file(file);
out:
return err;
@@ -120,6 +123,36 @@ static int fat_ioctl_get_volume_id(struct inode *inode, u32 __user *user_attr)
return put_user(sbi->vol_id, user_attr);
}
+static int fat_ioctl_fitrim(struct inode *inode, unsigned long arg)
+{
+ struct super_block *sb = inode->i_sb;
+ struct fstrim_range __user *user_range;
+ struct fstrim_range range;
+ int err;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (!bdev_max_discard_sectors(sb->s_bdev))
+ return -EOPNOTSUPP;
+
+ user_range = (struct fstrim_range __user *)arg;
+ if (copy_from_user(&range, user_range, sizeof(range)))
+ return -EFAULT;
+
+ range.minlen = max_t(unsigned int, range.minlen,
+ bdev_discard_granularity(sb->s_bdev));
+
+ err = fat_trim_fs(inode, &range);
+ if (err < 0)
+ return err;
+
+ if (copy_to_user(user_range, &range, sizeof(range)))
+ return -EFAULT;
+
+ return 0;
+}
+
long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = file_inode(filp);
@@ -132,26 +165,20 @@ long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return fat_ioctl_set_attributes(filp, user_attr);
case FAT_IOCTL_GET_VOLUME_ID:
return fat_ioctl_get_volume_id(inode, user_attr);
+ case FITRIM:
+ return fat_ioctl_fitrim(inode, arg);
default:
return -ENOTTY; /* Inappropriate ioctl for device */
}
}
-#ifdef CONFIG_COMPAT
-static long fat_generic_compat_ioctl(struct file *filp, unsigned int cmd,
- unsigned long arg)
-
-{
- return fat_generic_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
-}
-#endif
-
static int fat_file_release(struct inode *inode, struct file *filp)
{
if ((filp->f_mode & FMODE_WRITE) &&
- MSDOS_SB(inode->i_sb)->options.flush) {
+ MSDOS_SB(inode->i_sb)->options.flush) {
fat_flush_inodes(inode->i_sb, inode, NULL);
- congestion_wait(BLK_RW_ASYNC, HZ/10);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ io_schedule_timeout(HZ/10);
}
return 0;
}
@@ -159,29 +186,32 @@ static int fat_file_release(struct inode *inode, struct file *filp)
int fat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
{
struct inode *inode = filp->f_mapping->host;
- int res, err;
+ int err;
+
+ err = __generic_file_fsync(filp, start, end, datasync);
+ if (err)
+ return err;
- res = generic_file_fsync(filp, start, end, datasync);
err = sync_mapping_buffers(MSDOS_SB(inode->i_sb)->fat_inode->i_mapping);
+ if (err)
+ return err;
- return res ? res : err;
+ return blkdev_issue_flush(inode->i_sb->s_bdev);
}
const struct file_operations fat_file_operations = {
.llseek = generic_file_llseek,
- .read = do_sync_read,
- .write = do_sync_write,
- .aio_read = generic_file_aio_read,
- .aio_write = generic_file_aio_write,
- .mmap = generic_file_mmap,
+ .read_iter = generic_file_read_iter,
+ .write_iter = generic_file_write_iter,
+ .mmap_prepare = generic_file_mmap_prepare,
.release = fat_file_release,
.unlocked_ioctl = fat_generic_ioctl,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = fat_generic_compat_ioctl,
-#endif
+ .compat_ioctl = compat_ptr_ioctl,
.fsync = fat_file_fsync,
- .splice_read = generic_file_splice_read,
+ .splice_read = filemap_splice_read,
+ .splice_write = iter_file_splice_write,
+ .fallocate = fat_fallocate,
};
static int fat_cont_expand(struct inode *inode, loff_t size)
@@ -194,7 +224,7 @@ static int fat_cont_expand(struct inode *inode, loff_t size)
if (err)
goto out;
- inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
+ fat_truncate_time(inode, NULL, S_CTIME|S_MTIME);
mark_inode_dirty(inode);
if (IS_SYNC(inode)) {
int err2;
@@ -220,6 +250,62 @@ out:
return err;
}
+/*
+ * Preallocate space for a file. This implements fat's fallocate file
+ * operation, which gets called from sys_fallocate system call. User
+ * space requests len bytes at offset. If FALLOC_FL_KEEP_SIZE is set
+ * we just allocate clusters without zeroing them out. Otherwise we
+ * allocate and zero out clusters via an expanding truncate.
+ */
+static long fat_fallocate(struct file *file, int mode,
+ loff_t offset, loff_t len)
+{
+ int nr_cluster; /* Number of clusters to be allocated */
+ loff_t mm_bytes; /* Number of bytes to be allocated for file */
+ loff_t ondisksize; /* block aligned on-disk size in bytes*/
+ struct inode *inode = file->f_mapping->host;
+ struct super_block *sb = inode->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ int err = 0;
+
+ /* No support for hole punch or other fallocate flags. */
+ if (mode & ~FALLOC_FL_KEEP_SIZE)
+ return -EOPNOTSUPP;
+
+ /* No support for dir */
+ if (!S_ISREG(inode->i_mode))
+ return -EOPNOTSUPP;
+
+ inode_lock(inode);
+ if (mode & FALLOC_FL_KEEP_SIZE) {
+ ondisksize = inode->i_blocks << 9;
+ if ((offset + len) <= ondisksize)
+ goto error;
+
+ /* First compute the number of clusters to be allocated */
+ mm_bytes = offset + len - ondisksize;
+ nr_cluster = (mm_bytes + (sbi->cluster_size - 1)) >>
+ sbi->cluster_bits;
+
+ /* Start the allocation.We are not zeroing out the clusters */
+ while (nr_cluster-- > 0) {
+ err = fat_add_cluster(inode);
+ if (err)
+ goto error;
+ }
+ } else {
+ if ((offset + len) <= i_size_read(inode))
+ goto error;
+
+ /* This is just an expanding truncate */
+ err = fat_cont_expand(inode, (offset + len));
+ }
+
+error:
+ inode_unlock(inode);
+ return err;
+}
+
/* Free all clusters after the skip'th cluster. */
static int fat_free(struct inode *inode, int skip)
{
@@ -241,7 +327,7 @@ static int fat_free(struct inode *inode, int skip)
MSDOS_I(inode)->i_logstart = 0;
}
MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
- inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
+ fat_truncate_time(inode, NULL, S_CTIME|S_MTIME);
if (wait) {
err = fat_sync_inode(inode);
if (err) {
@@ -309,16 +395,25 @@ void fat_truncate_blocks(struct inode *inode, loff_t offset)
fat_flush_inodes(inode->i_sb, inode, NULL);
}
-int fat_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
+int fat_getattr(struct mnt_idmap *idmap, const struct path *path,
+ struct kstat *stat, u32 request_mask, unsigned int flags)
{
- struct inode *inode = dentry->d_inode;
- generic_fillattr(inode, stat);
- stat->blksize = MSDOS_SB(inode->i_sb)->cluster_size;
+ struct inode *inode = d_inode(path->dentry);
+ struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+
+ generic_fillattr(idmap, request_mask, inode, stat);
+ stat->blksize = sbi->cluster_size;
- if (MSDOS_SB(inode->i_sb)->options.nfs == FAT_NFS_NOSTALE_RO) {
+ if (sbi->options.nfs == FAT_NFS_NOSTALE_RO) {
/* Use i_pos for ino. This is used as fileid of nfs. */
- stat->ino = fat_i_pos_read(MSDOS_SB(inode->i_sb), inode);
+ stat->ino = fat_i_pos_read(sbi, inode);
}
+
+ if (sbi->options.isvfat && request_mask & STATX_BTIME) {
+ stat->result_mask |= STATX_BTIME;
+ stat->btime = MSDOS_I(inode)->i_crtime;
+ }
+
return 0;
}
EXPORT_SYMBOL_GPL(fat_getattr);
@@ -361,12 +456,14 @@ static int fat_sanitize_mode(const struct msdos_sb_info *sbi,
return 0;
}
-static int fat_allow_set_time(struct msdos_sb_info *sbi, struct inode *inode)
+static int fat_allow_set_time(struct mnt_idmap *idmap,
+ struct msdos_sb_info *sbi, struct inode *inode)
{
umode_t allow_utime = sbi->options.allow_utime;
- if (!uid_eq(current_fsuid(), inode->i_uid)) {
- if (in_group_p(inode->i_gid))
+ if (!vfsuid_eq_kuid(i_uid_into_vfsuid(idmap, inode),
+ current_fsuid())) {
+ if (vfsgid_in_group_p(i_gid_into_vfsgid(idmap, inode)))
allow_utime >>= 3;
if (allow_utime & MAY_WRITE)
return 1;
@@ -380,21 +477,22 @@ static int fat_allow_set_time(struct msdos_sb_info *sbi, struct inode *inode)
/* valid file mode bits */
#define FAT_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXUGO)
-int fat_setattr(struct dentry *dentry, struct iattr *attr)
+int fat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
+ struct iattr *attr)
{
struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
- struct inode *inode = dentry->d_inode;
+ struct inode *inode = d_inode(dentry);
unsigned int ia_valid;
int error;
/* Check for setting the inode time. */
ia_valid = attr->ia_valid;
if (ia_valid & TIMES_SET_FLAGS) {
- if (fat_allow_set_time(sbi, inode))
+ if (fat_allow_set_time(idmap, sbi, inode))
attr->ia_valid &= ~TIMES_SET_FLAGS;
}
- error = inode_change_ok(inode, attr);
+ error = setattr_prepare(idmap, dentry, attr);
attr->ia_valid = ia_valid;
if (error) {
if (sbi->options.quiet)
@@ -420,9 +518,11 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr)
}
if (((attr->ia_valid & ATTR_UID) &&
- (!uid_eq(attr->ia_uid, sbi->options.fs_uid))) ||
+ (!uid_eq(from_vfsuid(idmap, i_user_ns(inode), attr->ia_vfsuid),
+ sbi->options.fs_uid))) ||
((attr->ia_valid & ATTR_GID) &&
- (!gid_eq(attr->ia_gid, sbi->options.fs_gid))) ||
+ (!gid_eq(from_vfsgid(idmap, i_user_ns(inode), attr->ia_vfsgid),
+ sbi->options.fs_gid))) ||
((attr->ia_valid & ATTR_MODE) &&
(attr->ia_mode & ~FAT_VALID_MODE)))
error = -EPERM;
@@ -443,13 +543,28 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr)
}
if (attr->ia_valid & ATTR_SIZE) {
+ error = fat_block_truncate_page(inode, attr->ia_size);
+ if (error)
+ goto out;
down_write(&MSDOS_I(inode)->truncate_lock);
truncate_setsize(inode, attr->ia_size);
fat_truncate_blocks(inode, attr->ia_size);
up_write(&MSDOS_I(inode)->truncate_lock);
}
- setattr_copy(inode, attr);
+ /*
+ * setattr_copy can't truncate these appropriately, so we'll
+ * copy them ourselves
+ */
+ if (attr->ia_valid & ATTR_ATIME)
+ fat_truncate_time(inode, &attr->ia_atime, S_ATIME);
+ if (attr->ia_valid & ATTR_CTIME)
+ fat_truncate_time(inode, &attr->ia_ctime, S_CTIME);
+ if (attr->ia_valid & ATTR_MTIME)
+ fat_truncate_time(inode, &attr->ia_mtime, S_MTIME);
+ attr->ia_valid &= ~(ATTR_ATIME|ATTR_CTIME|ATTR_MTIME);
+
+ setattr_copy(idmap, inode, attr);
mark_inode_dirty(inode);
out:
return error;
@@ -459,4 +574,5 @@ EXPORT_SYMBOL_GPL(fat_setattr);
const struct inode_operations fat_file_inode_operations = {
.setattr = fat_setattr,
.getattr = fat_getattr,
+ .update_time = fat_update_time,
};
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 11b51bb55b42..0b6009cd1844 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/fs/fat/inode.c
*
@@ -11,23 +12,17 @@
*/
#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/time.h>
-#include <linux/slab.h>
-#include <linux/seq_file.h>
#include <linux/pagemap.h>
#include <linux/mpage.h>
-#include <linux/buffer_head.h>
-#include <linux/mount.h>
-#include <linux/aio.h>
#include <linux/vfs.h>
-#include <linux/parser.h>
+#include <linux/seq_file.h>
#include <linux/uio.h>
-#include <linux/writeback.h>
-#include <linux/log2.h>
-#include <linux/hash.h>
#include <linux/blkdev.h>
-#include <asm/unaligned.h>
+#include <linux/backing-dev.h>
+#include <linux/unaligned.h>
+#include <linux/random.h>
+#include <linux/iversion.h>
+#include <linux/fs_struct.h>
#include "fat.h"
#ifndef CONFIG_FAT_DEFAULT_IOCHARSET
@@ -35,11 +30,78 @@
#define CONFIG_FAT_DEFAULT_IOCHARSET ""
#endif
+#define KB_IN_SECTORS 2
+
+/* DOS dates from 1980/1/1 through 2107/12/31 */
+#define FAT_DATE_MIN (0<<9 | 1<<5 | 1)
+#define FAT_DATE_MAX (127<<9 | 12<<5 | 31)
+#define FAT_TIME_MAX (23<<11 | 59<<5 | 29)
+
+/*
+ * A deserialized copy of the on-disk structure laid out in struct
+ * fat_boot_sector.
+ */
+struct fat_bios_param_block {
+ u16 fat_sector_size;
+ u8 fat_sec_per_clus;
+ u16 fat_reserved;
+ u8 fat_fats;
+ u16 fat_dir_entries;
+ u16 fat_sectors;
+ u16 fat_fat_length;
+ u32 fat_total_sect;
+
+ u8 fat16_state;
+ u32 fat16_vol_id;
+
+ u32 fat32_length;
+ u32 fat32_root_cluster;
+ u16 fat32_info_sector;
+ u8 fat32_state;
+ u32 fat32_vol_id;
+};
+
static int fat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE;
static char fat_default_iocharset[] = CONFIG_FAT_DEFAULT_IOCHARSET;
+static struct fat_floppy_defaults {
+ unsigned nr_sectors;
+ unsigned sec_per_clus;
+ unsigned dir_entries;
+ unsigned media;
+ unsigned fat_length;
+} floppy_defaults[] = {
+{
+ .nr_sectors = 160 * KB_IN_SECTORS,
+ .sec_per_clus = 1,
+ .dir_entries = 64,
+ .media = 0xFE,
+ .fat_length = 1,
+},
+{
+ .nr_sectors = 180 * KB_IN_SECTORS,
+ .sec_per_clus = 1,
+ .dir_entries = 64,
+ .media = 0xFC,
+ .fat_length = 2,
+},
+{
+ .nr_sectors = 320 * KB_IN_SECTORS,
+ .sec_per_clus = 2,
+ .dir_entries = 112,
+ .media = 0xFF,
+ .fat_length = 1,
+},
+{
+ .nr_sectors = 360 * KB_IN_SECTORS,
+ .sec_per_clus = 2,
+ .dir_entries = 112,
+ .media = 0xFD,
+ .fat_length = 2,
+},
+};
-static int fat_add_cluster(struct inode *inode)
+int fat_add_cluster(struct inode *inode)
{
int err, cluster;
@@ -61,10 +123,10 @@ static inline int __fat_get_block(struct inode *inode, sector_t iblock,
struct super_block *sb = inode->i_sb;
struct msdos_sb_info *sbi = MSDOS_SB(sb);
unsigned long mapped_blocks;
- sector_t phys;
+ sector_t phys, last_block;
int err, offset;
- err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create);
+ err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create, false);
if (err)
return err;
if (phys) {
@@ -81,8 +143,14 @@ static inline int __fat_get_block(struct inode *inode, sector_t iblock,
return -EIO;
}
+ last_block = inode->i_blocks >> (sb->s_blocksize_bits - 9);
offset = (unsigned long)iblock & (sbi->sec_per_clus - 1);
- if (!offset) {
+ /*
+ * allocate a cluster according to the following.
+ * 1) no more available blocks
+ * 2) not part of fallocate region
+ */
+ if (!offset && !(iblock < last_block)) {
/* TODO: multiple cluster allocation would be desirable. */
err = fat_add_cluster(inode);
if (err)
@@ -94,11 +162,17 @@ static inline int __fat_get_block(struct inode *inode, sector_t iblock,
*max_blocks = min(mapped_blocks, *max_blocks);
MSDOS_I(inode)->mmu_private += *max_blocks << sb->s_blocksize_bits;
- err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create);
+ err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create, false);
if (err)
return err;
+ if (!phys) {
+ fat_fs_error(sb,
+ "invalid FAT chain (i_pos %lld, last_block %llu)",
+ MSDOS_I(inode)->i_pos,
+ (unsigned long long)last_block);
+ return -EIO;
+ }
- BUG_ON(!phys);
BUG_ON(*max_blocks != mapped_blocks);
set_buffer_new(bh_result);
map_bh(bh_result, sb, phys);
@@ -120,26 +194,20 @@ static int fat_get_block(struct inode *inode, sector_t iblock,
return 0;
}
-static int fat_writepage(struct page *page, struct writeback_control *wbc)
-{
- return block_write_full_page(page, fat_get_block, wbc);
-}
-
static int fat_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
return mpage_writepages(mapping, wbc, fat_get_block);
}
-static int fat_readpage(struct file *file, struct page *page)
+static int fat_read_folio(struct file *file, struct folio *folio)
{
- return mpage_readpage(page, fat_get_block);
+ return mpage_read_folio(folio, fat_get_block);
}
-static int fat_readpages(struct file *file, struct address_space *mapping,
- struct list_head *pages, unsigned nr_pages)
+static void fat_readahead(struct readahead_control *rac)
{
- return mpage_readpages(mapping, pages, nr_pages, fat_get_block);
+ mpage_readahead(rac, fat_get_block);
}
static void fat_write_failed(struct address_space *mapping, loff_t to)
@@ -147,53 +215,54 @@ static void fat_write_failed(struct address_space *mapping, loff_t to)
struct inode *inode = mapping->host;
if (to > inode->i_size) {
- truncate_pagecache(inode, to, inode->i_size);
+ truncate_pagecache(inode, inode->i_size);
fat_truncate_blocks(inode, inode->i_size);
}
}
-static int fat_write_begin(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned flags,
- struct page **pagep, void **fsdata)
+static int fat_write_begin(const struct kiocb *iocb,
+ struct address_space *mapping,
+ loff_t pos, unsigned len,
+ struct folio **foliop, void **fsdata)
{
int err;
- *pagep = NULL;
- err = cont_write_begin(file, mapping, pos, len, flags,
- pagep, fsdata, fat_get_block,
+ err = cont_write_begin(iocb, mapping, pos, len,
+ foliop, fsdata, fat_get_block,
&MSDOS_I(mapping->host)->mmu_private);
if (err < 0)
fat_write_failed(mapping, pos + len);
return err;
}
-static int fat_write_end(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned copied,
- struct page *pagep, void *fsdata)
+static int fat_write_end(const struct kiocb *iocb,
+ struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct folio *folio, void *fsdata)
{
struct inode *inode = mapping->host;
int err;
- err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
+ err = generic_write_end(iocb, mapping, pos, len, copied, folio, fsdata);
if (err < len)
fat_write_failed(mapping, pos + len);
if (!(err < 0) && !(MSDOS_I(inode)->i_attrs & ATTR_ARCH)) {
- inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
+ fat_truncate_time(inode, NULL, S_CTIME|S_MTIME);
MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
mark_inode_dirty(inode);
}
return err;
}
-static ssize_t fat_direct_IO(int rw, struct kiocb *iocb,
- const struct iovec *iov,
- loff_t offset, unsigned long nr_segs)
+static ssize_t fat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
+ size_t count = iov_iter_count(iter);
+ loff_t offset = iocb->ki_pos;
ssize_t ret;
- if (rw == WRITE) {
+ if (iov_iter_rw(iter) == WRITE) {
/*
* FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
* so we need to update the ->mmu_private to block boundary.
@@ -203,7 +272,7 @@ static ssize_t fat_direct_IO(int rw, struct kiocb *iocb,
*
* Return 0, and fallback to normal buffered write.
*/
- loff_t size = offset + iov_length(iov, nr_segs);
+ loff_t size = offset + count;
if (MSDOS_I(inode)->mmu_private < size)
return 0;
}
@@ -212,35 +281,73 @@ static ssize_t fat_direct_IO(int rw, struct kiocb *iocb,
* FAT need to use the DIO_LOCKING for avoiding the race
* condition of fat_get_block() and ->truncate().
*/
- ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
- fat_get_block);
- if (ret < 0 && (rw & WRITE))
- fat_write_failed(mapping, offset + iov_length(iov, nr_segs));
+ ret = blockdev_direct_IO(iocb, inode, iter, fat_get_block);
+ if (ret < 0 && iov_iter_rw(iter) == WRITE)
+ fat_write_failed(mapping, offset + count);
return ret;
}
+static int fat_get_block_bmap(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create)
+{
+ struct super_block *sb = inode->i_sb;
+ unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
+ int err;
+ sector_t bmap;
+ unsigned long mapped_blocks;
+
+ BUG_ON(create != 0);
+
+ err = fat_bmap(inode, iblock, &bmap, &mapped_blocks, create, true);
+ if (err)
+ return err;
+
+ if (bmap) {
+ map_bh(bh_result, sb, bmap);
+ max_blocks = min(mapped_blocks, max_blocks);
+ }
+
+ bh_result->b_size = max_blocks << sb->s_blocksize_bits;
+
+ return 0;
+}
+
static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
{
sector_t blocknr;
/* fat_get_cluster() assumes the requested blocknr isn't truncated. */
down_read(&MSDOS_I(mapping->host)->truncate_lock);
- blocknr = generic_block_bmap(mapping, block, fat_get_block);
+ blocknr = generic_block_bmap(mapping, block, fat_get_block_bmap);
up_read(&MSDOS_I(mapping->host)->truncate_lock);
return blocknr;
}
+/*
+ * fat_block_truncate_page() zeroes out a mapping from file offset `from'
+ * up to the end of the block which corresponds to `from'.
+ * This is required during truncate to physically zeroout the tail end
+ * of that block so it doesn't yield old data if the file is later grown.
+ * Also, avoid causing failure from fsx for cases of "data past EOF"
+ */
+int fat_block_truncate_page(struct inode *inode, loff_t from)
+{
+ return block_truncate_page(inode->i_mapping, from, fat_get_block);
+}
+
static const struct address_space_operations fat_aops = {
- .readpage = fat_readpage,
- .readpages = fat_readpages,
- .writepage = fat_writepage,
+ .dirty_folio = block_dirty_folio,
+ .invalidate_folio = block_invalidate_folio,
+ .read_folio = fat_read_folio,
+ .readahead = fat_readahead,
.writepages = fat_writepages,
.write_begin = fat_write_begin,
.write_end = fat_write_end,
.direct_IO = fat_direct_IO,
- .bmap = _fat_bmap
+ .bmap = _fat_bmap,
+ .migrate_folio = buffer_migrate_folio,
};
/*
@@ -359,7 +466,7 @@ struct inode *fat_iget(struct super_block *sb, loff_t i_pos)
static int is_exec(unsigned char *extension)
{
- unsigned char *exe_extensions = "EXECOMBAT", *walk;
+ unsigned char exe_extensions[] = "EXECOMBAT", *walk;
for (walk = exe_extensions; *walk; walk += 3)
if (!strncmp(extension, walk, 3))
@@ -384,17 +491,36 @@ static int fat_calc_dir_size(struct inode *inode)
return 0;
}
+static int fat_validate_dir(struct inode *dir)
+{
+ struct super_block *sb = dir->i_sb;
+
+ if (dir->i_nlink < 2) {
+ /* Directory should have "."/".." entries at least. */
+ fat_fs_error(sb, "corrupted directory (invalid entries)");
+ return -EIO;
+ }
+ if (MSDOS_I(dir)->i_start == 0 ||
+ MSDOS_I(dir)->i_start == MSDOS_SB(sb)->root_cluster) {
+ /* Directory should point valid cluster. */
+ fat_fs_error(sb, "corrupted directory (invalid i_start)");
+ return -EIO;
+ }
+ return 0;
+}
+
/* doesn't deal with root inode */
int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
{
struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+ struct timespec64 mtime;
int error;
MSDOS_I(inode)->i_pos = 0;
inode->i_uid = sbi->options.fs_uid;
inode->i_gid = sbi->options.fs_gid;
- inode->i_version++;
- inode->i_generation = get_seconds();
+ inode_inc_iversion(inode);
+ inode->i_generation = get_random_u32();
if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) {
inode->i_generation &= ~1;
@@ -410,6 +536,10 @@ int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
MSDOS_I(inode)->mmu_private = inode->i_size;
set_nlink(inode, fat_subdirs(inode));
+
+ error = fat_validate_dir(inode);
+ if (error < 0)
+ return error;
} else { /* not a directory */
inode->i_generation |= 1;
inode->i_mode = fat_make_mode(sbi, de->attr,
@@ -433,13 +563,18 @@ int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
& ~((loff_t)sbi->cluster_size - 1)) >> 9;
- fat_time_fat2unix(sbi, &inode->i_mtime, de->time, de->date, 0);
+ fat_time_fat2unix(sbi, &mtime, de->time, de->date, 0);
+ inode_set_mtime_to_ts(inode, mtime);
+ inode_set_ctime_to_ts(inode, mtime);
if (sbi->options.isvfat) {
- fat_time_fat2unix(sbi, &inode->i_ctime, de->ctime,
+ struct timespec64 atime;
+
+ fat_time_fat2unix(sbi, &atime, 0, de->adate, 0);
+ inode_set_atime_to_ts(inode, atime);
+ fat_time_fat2unix(sbi, &MSDOS_I(inode)->i_crtime, de->ctime,
de->cdate, de->ctime_cs);
- fat_time_fat2unix(sbi, &inode->i_atime, 0, de->adate, 0);
} else
- inode->i_ctime = inode->i_atime = inode->i_mtime;
+ inode_set_atime_to_ts(inode, fat_truncate_atime(sbi, &mtime));
return 0;
}
@@ -472,7 +607,7 @@ struct inode *fat_build_inode(struct super_block *sb,
goto out;
}
inode->i_ino = iunique(sb, MSDOS_ROOT_INO);
- inode->i_version = 1;
+ inode_set_iversion(inode, 1);
err = fat_fill_inode(inode, de);
if (err) {
iput(inode);
@@ -488,13 +623,43 @@ out:
EXPORT_SYMBOL_GPL(fat_build_inode);
+static int __fat_write_inode(struct inode *inode, int wait);
+
+static void fat_free_eofblocks(struct inode *inode)
+{
+ /* Release unwritten fallocated blocks on inode eviction. */
+ if ((inode->i_blocks << 9) >
+ round_up(MSDOS_I(inode)->mmu_private,
+ MSDOS_SB(inode->i_sb)->cluster_size)) {
+ int err;
+
+ fat_truncate_blocks(inode, MSDOS_I(inode)->mmu_private);
+ /* Fallocate results in updating the i_start/iogstart
+ * for the zero byte file. So, make it return to
+ * original state during evict and commit it to avoid
+ * any corruption on the next access to the cluster
+ * chain for the file.
+ */
+ err = __fat_write_inode(inode, inode_needs_sync(inode));
+ if (err) {
+ fat_msg(inode->i_sb, KERN_WARNING, "Failed to "
+ "update on disk inode for unused "
+ "fallocated blocks, inode could be "
+ "corrupted. Please run fsck");
+ }
+
+ }
+}
+
static void fat_evict_inode(struct inode *inode)
{
- truncate_inode_pages(&inode->i_data, 0);
+ truncate_inode_pages_final(&inode->i_data);
if (!inode->i_nlink) {
inode->i_size = 0;
fat_truncate_blocks(inode, 0);
- }
+ } else
+ fat_free_eofblocks(inode);
+
invalidate_inode_buffers(inode);
clear_inode(inode);
fat_cache_inval_inode(inode);
@@ -506,10 +671,10 @@ static void fat_set_state(struct super_block *sb,
{
struct buffer_head *bh;
struct fat_boot_sector *b;
- struct msdos_sb_info *sbi = sb->s_fs_info;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
/* do not change any thing if mounted read only */
- if ((sb->s_flags & MS_RDONLY) && !force)
+ if (sb_rdonly(sb) && !force)
return;
/* do not change state if fs was dirty */
@@ -531,7 +696,7 @@ static void fat_set_state(struct super_block *sb,
b = (struct fat_boot_sector *) bh->b_data;
- if (sbi->fat_bits == 32) {
+ if (is_fat32(sbi)) {
if (set)
b->fat32.state |= FAT_STATE_DIRTY;
else
@@ -548,6 +713,24 @@ static void fat_set_state(struct super_block *sb,
brelse(bh);
}
+static void fat_reset_iocharset(struct fat_mount_options *opts)
+{
+ if (opts->iocharset != fat_default_iocharset) {
+ /* Note: opts->iocharset can be NULL here */
+ kfree(opts->iocharset);
+ opts->iocharset = fat_default_iocharset;
+ }
+}
+
+static void delayed_free(struct rcu_head *p)
+{
+ struct msdos_sb_info *sbi = container_of(p, struct msdos_sb_info, rcu);
+ unload_nls(sbi->nls_disk);
+ unload_nls(sbi->nls_io);
+ fat_reset_iocharset(&sbi->options);
+ kfree(sbi);
+}
+
static void fat_put_super(struct super_block *sb)
{
struct msdos_sb_info *sbi = MSDOS_SB(sb);
@@ -557,14 +740,7 @@ static void fat_put_super(struct super_block *sb)
iput(sbi->fsinfo_inode);
iput(sbi->fat_inode);
- unload_nls(sbi->nls_disk);
- unload_nls(sbi->nls_io);
-
- if (sbi->options.iocharset != fat_default_iocharset)
- kfree(sbi->options.iocharset);
-
- sb->s_fs_info = NULL;
- kfree(sbi);
+ call_rcu(&sbi->rcu, delayed_free);
}
static struct kmem_cache *fat_inode_cachep;
@@ -572,25 +748,28 @@ static struct kmem_cache *fat_inode_cachep;
static struct inode *fat_alloc_inode(struct super_block *sb)
{
struct msdos_inode_info *ei;
- ei = kmem_cache_alloc(fat_inode_cachep, GFP_NOFS);
+ ei = alloc_inode_sb(sb, fat_inode_cachep, GFP_NOFS);
if (!ei)
return NULL;
init_rwsem(&ei->truncate_lock);
+ /* Zeroing to allow iput() even if partial initialized inode. */
+ ei->mmu_private = 0;
+ ei->i_start = 0;
+ ei->i_logstart = 0;
+ ei->i_attrs = 0;
+ ei->i_pos = 0;
+ ei->i_crtime.tv_sec = 0;
+ ei->i_crtime.tv_nsec = 0;
+
return &ei->vfs_inode;
}
-static void fat_i_callback(struct rcu_head *head)
+static void fat_free_inode(struct inode *inode)
{
- struct inode *inode = container_of(head, struct inode, i_rcu);
kmem_cache_free(fat_inode_cachep, MSDOS_I(inode));
}
-static void fat_destroy_inode(struct inode *inode)
-{
- call_rcu(&inode->i_rcu, fat_i_callback);
-}
-
static void init_once(void *foo)
{
struct msdos_inode_info *ei = (struct msdos_inode_info *)foo;
@@ -609,7 +788,7 @@ static int __init fat_init_inodecache(void)
fat_inode_cachep = kmem_cache_create("fat_inode_cache",
sizeof(struct msdos_inode_info),
0, (SLAB_RECLAIM_ACCOUNT|
- SLAB_MEM_SPREAD),
+ SLAB_ACCOUNT),
init_once);
if (fat_inode_cachep == NULL)
return -ENOMEM;
@@ -626,15 +805,18 @@ static void __exit fat_destroy_inodecache(void)
kmem_cache_destroy(fat_inode_cachep);
}
-static int fat_remount(struct super_block *sb, int *flags, char *data)
+int fat_reconfigure(struct fs_context *fc)
{
- int new_rdonly;
+ bool new_rdonly;
+ struct super_block *sb = fc->root->d_sb;
struct msdos_sb_info *sbi = MSDOS_SB(sb);
- *flags |= MS_NODIRATIME | (sbi->options.isvfat ? 0 : MS_NOATIME);
+ fc->sb_flags |= SB_NODIRATIME | (sbi->options.isvfat ? 0 : SB_NOATIME);
+
+ sync_filesystem(sb);
/* make sure we update state on remount. */
- new_rdonly = *flags & MS_RDONLY;
- if (new_rdonly != (sb->s_flags & MS_RDONLY)) {
+ new_rdonly = fc->sb_flags & SB_RDONLY;
+ if (new_rdonly != sb_rdonly(sb)) {
if (new_rdonly)
fat_set_state(sb, 0, 0);
else
@@ -642,6 +824,7 @@ static int fat_remount(struct super_block *sb, int *flags, char *data)
}
return 0;
}
+EXPORT_SYMBOL_GPL(fat_reconfigure);
static int fat_statfs(struct dentry *dentry, struct kstatfs *buf)
{
@@ -661,8 +844,7 @@ static int fat_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_blocks = sbi->max_cluster - FAT_START_ENT;
buf->f_bfree = sbi->free_clusters;
buf->f_bavail = sbi->free_clusters;
- buf->f_fsid.val[0] = (u32)id;
- buf->f_fsid.val[1] = (u32)(id >> 32);
+ buf->f_fsid = u64_to_fsid(id);
buf->f_namelen =
(sbi->options.isvfat ? FAT_LFN_LEN : 12) * NLS_MAX_CHARSET_SIZE;
@@ -675,6 +857,7 @@ static int __fat_write_inode(struct inode *inode, int wait)
struct msdos_sb_info *sbi = MSDOS_SB(sb);
struct buffer_head *bh;
struct msdos_dir_entry *raw_entry;
+ struct timespec64 mtime;
loff_t i_pos;
sector_t blocknr;
int err, offset;
@@ -708,14 +891,16 @@ retry:
raw_entry->size = cpu_to_le32(inode->i_size);
raw_entry->attr = fat_make_attrs(inode);
fat_set_start(raw_entry, MSDOS_I(inode)->i_logstart);
- fat_time_unix2fat(sbi, &inode->i_mtime, &raw_entry->time,
+ mtime = inode_get_mtime(inode);
+ fat_time_unix2fat(sbi, &mtime, &raw_entry->time,
&raw_entry->date, NULL);
if (sbi->options.isvfat) {
+ struct timespec64 ts = inode_get_atime(inode);
__le16 atime;
- fat_time_unix2fat(sbi, &inode->i_ctime, &raw_entry->ctime,
+
+ fat_time_unix2fat(sbi, &ts, &atime, &raw_entry->adate, NULL);
+ fat_time_unix2fat(sbi, &MSDOS_I(inode)->i_crtime, &raw_entry->ctime,
&raw_entry->cdate, &raw_entry->ctime_cs);
- fat_time_unix2fat(sbi, &inode->i_atime, &atime,
- &raw_entry->adate, NULL);
}
spin_unlock(&sbi->inode_hash_lock);
mark_buffer_dirty(bh);
@@ -752,13 +937,11 @@ EXPORT_SYMBOL_GPL(fat_sync_inode);
static int fat_show_options(struct seq_file *m, struct dentry *root);
static const struct super_operations fat_sops = {
.alloc_inode = fat_alloc_inode,
- .destroy_inode = fat_destroy_inode,
+ .free_inode = fat_free_inode,
.write_inode = fat_write_inode,
.evict_inode = fat_evict_inode,
.put_super = fat_put_super,
.statfs = fat_statfs,
- .remount_fs = fat_remount,
-
.show_options = fat_show_options,
};
@@ -848,366 +1031,304 @@ static int fat_show_options(struct seq_file *m, struct dentry *root)
seq_puts(m, ",nfs=stale_rw");
if (opts->discard)
seq_puts(m, ",discard");
+ if (opts->dos1xfloppy)
+ seq_puts(m, ",dos1xfloppy");
return 0;
}
enum {
- Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid,
- Opt_umask, Opt_dmask, Opt_fmask, Opt_allow_utime, Opt_codepage,
- Opt_usefree, Opt_nocase, Opt_quiet, Opt_showexec, Opt_debug,
- Opt_immutable, Opt_dots, Opt_nodots,
- Opt_charset, Opt_shortname_lower, Opt_shortname_win95,
- Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
- Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
- Opt_obsolete, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont,
- Opt_err_panic, Opt_err_ro, Opt_discard, Opt_nfs, Opt_time_offset,
- Opt_nfs_stale_rw, Opt_nfs_nostale_ro, Opt_err,
+ Opt_check, Opt_uid, Opt_gid, Opt_umask, Opt_dmask, Opt_fmask,
+ Opt_allow_utime, Opt_codepage, Opt_usefree, Opt_nocase, Opt_quiet,
+ Opt_showexec, Opt_debug, Opt_immutable, Opt_dots, Opt_dotsOK,
+ Opt_charset, Opt_shortname, Opt_utf8, Opt_utf8_bool,
+ Opt_uni_xl, Opt_uni_xl_bool, Opt_nonumtail, Opt_nonumtail_bool,
+ Opt_obsolete, Opt_flush, Opt_tz, Opt_rodir, Opt_errors, Opt_discard,
+ Opt_nfs, Opt_nfs_enum, Opt_time_offset, Opt_dos1xfloppy,
};
-static const match_table_t fat_tokens = {
- {Opt_check_r, "check=relaxed"},
- {Opt_check_s, "check=strict"},
- {Opt_check_n, "check=normal"},
- {Opt_check_r, "check=r"},
- {Opt_check_s, "check=s"},
- {Opt_check_n, "check=n"},
- {Opt_uid, "uid=%u"},
- {Opt_gid, "gid=%u"},
- {Opt_umask, "umask=%o"},
- {Opt_dmask, "dmask=%o"},
- {Opt_fmask, "fmask=%o"},
- {Opt_allow_utime, "allow_utime=%o"},
- {Opt_codepage, "codepage=%u"},
- {Opt_usefree, "usefree"},
- {Opt_nocase, "nocase"},
- {Opt_quiet, "quiet"},
- {Opt_showexec, "showexec"},
- {Opt_debug, "debug"},
- {Opt_immutable, "sys_immutable"},
- {Opt_flush, "flush"},
- {Opt_tz_utc, "tz=UTC"},
- {Opt_time_offset, "time_offset=%d"},
- {Opt_err_cont, "errors=continue"},
- {Opt_err_panic, "errors=panic"},
- {Opt_err_ro, "errors=remount-ro"},
- {Opt_discard, "discard"},
- {Opt_nfs_stale_rw, "nfs"},
- {Opt_nfs_stale_rw, "nfs=stale_rw"},
- {Opt_nfs_nostale_ro, "nfs=nostale_ro"},
- {Opt_obsolete, "conv=binary"},
- {Opt_obsolete, "conv=text"},
- {Opt_obsolete, "conv=auto"},
- {Opt_obsolete, "conv=b"},
- {Opt_obsolete, "conv=t"},
- {Opt_obsolete, "conv=a"},
- {Opt_obsolete, "fat=%u"},
- {Opt_obsolete, "blocksize=%u"},
- {Opt_obsolete, "cvf_format=%20s"},
- {Opt_obsolete, "cvf_options=%100s"},
- {Opt_obsolete, "posix"},
- {Opt_err, NULL},
+static const struct constant_table fat_param_check[] = {
+ {"relaxed", 'r'},
+ {"r", 'r'},
+ {"strict", 's'},
+ {"s", 's'},
+ {"normal", 'n'},
+ {"n", 'n'},
+ {}
};
-static const match_table_t msdos_tokens = {
- {Opt_nodots, "nodots"},
- {Opt_nodots, "dotsOK=no"},
- {Opt_dots, "dots"},
- {Opt_dots, "dotsOK=yes"},
- {Opt_err, NULL}
+
+static const struct constant_table fat_param_tz[] = {
+ {"UTC", 0},
+ {}
};
-static const match_table_t vfat_tokens = {
- {Opt_charset, "iocharset=%s"},
- {Opt_shortname_lower, "shortname=lower"},
- {Opt_shortname_win95, "shortname=win95"},
- {Opt_shortname_winnt, "shortname=winnt"},
- {Opt_shortname_mixed, "shortname=mixed"},
- {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */
- {Opt_utf8_no, "utf8=no"},
- {Opt_utf8_no, "utf8=false"},
- {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */
- {Opt_utf8_yes, "utf8=yes"},
- {Opt_utf8_yes, "utf8=true"},
- {Opt_utf8_yes, "utf8"},
- {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */
- {Opt_uni_xl_no, "uni_xlate=no"},
- {Opt_uni_xl_no, "uni_xlate=false"},
- {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */
- {Opt_uni_xl_yes, "uni_xlate=yes"},
- {Opt_uni_xl_yes, "uni_xlate=true"},
- {Opt_uni_xl_yes, "uni_xlate"},
- {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */
- {Opt_nonumtail_no, "nonumtail=no"},
- {Opt_nonumtail_no, "nonumtail=false"},
- {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */
- {Opt_nonumtail_yes, "nonumtail=yes"},
- {Opt_nonumtail_yes, "nonumtail=true"},
- {Opt_nonumtail_yes, "nonumtail"},
- {Opt_rodir, "rodir"},
- {Opt_err, NULL}
+
+static const struct constant_table fat_param_errors[] = {
+ {"continue", FAT_ERRORS_CONT},
+ {"panic", FAT_ERRORS_PANIC},
+ {"remount-ro", FAT_ERRORS_RO},
+ {}
};
-static int parse_options(struct super_block *sb, char *options, int is_vfat,
- int silent, int *debug, struct fat_mount_options *opts)
-{
- char *p;
- substring_t args[MAX_OPT_ARGS];
- int option;
- char *iocharset;
- opts->isvfat = is_vfat;
+static const struct constant_table fat_param_nfs[] = {
+ {"stale_rw", FAT_NFS_STALE_RW},
+ {"nostale_ro", FAT_NFS_NOSTALE_RO},
+ {}
+};
- opts->fs_uid = current_uid();
- opts->fs_gid = current_gid();
- opts->fs_fmask = opts->fs_dmask = current_umask();
- opts->allow_utime = -1;
- opts->codepage = fat_default_codepage;
- opts->iocharset = fat_default_iocharset;
- if (is_vfat) {
- opts->shortname = VFAT_SFN_DISPLAY_WINNT|VFAT_SFN_CREATE_WIN95;
- opts->rodir = 0;
- } else {
- opts->shortname = 0;
- opts->rodir = 1;
- }
- opts->name_check = 'n';
- opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0;
- opts->utf8 = opts->unicode_xlate = 0;
- opts->numtail = 1;
- opts->usefree = opts->nocase = 0;
- opts->tz_set = 0;
- opts->nfs = 0;
- opts->errors = FAT_ERRORS_RO;
- *debug = 0;
+/*
+ * These are all obsolete but we still reject invalid options.
+ * The corresponding values are therefore meaningless.
+ */
+static const struct constant_table fat_param_conv[] = {
+ {"binary", 0},
+ {"text", 0},
+ {"auto", 0},
+ {"b", 0},
+ {"t", 0},
+ {"a", 0},
+ {}
+};
- if (!options)
- goto out;
+/* Core options. See below for vfat and msdos extras */
+const struct fs_parameter_spec fat_param_spec[] = {
+ fsparam_enum ("check", Opt_check, fat_param_check),
+ fsparam_uid ("uid", Opt_uid),
+ fsparam_gid ("gid", Opt_gid),
+ fsparam_u32oct ("umask", Opt_umask),
+ fsparam_u32oct ("dmask", Opt_dmask),
+ fsparam_u32oct ("fmask", Opt_fmask),
+ fsparam_u32oct ("allow_utime", Opt_allow_utime),
+ fsparam_u32 ("codepage", Opt_codepage),
+ fsparam_flag ("usefree", Opt_usefree),
+ fsparam_flag ("nocase", Opt_nocase),
+ fsparam_flag ("quiet", Opt_quiet),
+ fsparam_flag ("showexec", Opt_showexec),
+ fsparam_flag ("debug", Opt_debug),
+ fsparam_flag ("sys_immutable", Opt_immutable),
+ fsparam_flag ("flush", Opt_flush),
+ fsparam_enum ("tz", Opt_tz, fat_param_tz),
+ fsparam_s32 ("time_offset", Opt_time_offset),
+ fsparam_enum ("errors", Opt_errors, fat_param_errors),
+ fsparam_flag ("discard", Opt_discard),
+ fsparam_flag ("nfs", Opt_nfs),
+ fsparam_enum ("nfs", Opt_nfs_enum, fat_param_nfs),
+ fsparam_flag ("dos1xfloppy", Opt_dos1xfloppy),
+ __fsparam(fs_param_is_enum, "conv",
+ Opt_obsolete, fs_param_deprecated, fat_param_conv),
+ __fsparam(fs_param_is_u32, "fat",
+ Opt_obsolete, fs_param_deprecated, NULL),
+ __fsparam(fs_param_is_u32, "blocksize",
+ Opt_obsolete, fs_param_deprecated, NULL),
+ __fsparam(fs_param_is_string, "cvf_format",
+ Opt_obsolete, fs_param_deprecated, NULL),
+ __fsparam(fs_param_is_string, "cvf_options",
+ Opt_obsolete, fs_param_deprecated, NULL),
+ __fsparam(NULL, "posix",
+ Opt_obsolete, fs_param_deprecated, NULL),
+ {}
+};
+EXPORT_SYMBOL_GPL(fat_param_spec);
- while ((p = strsep(&options, ",")) != NULL) {
- int token;
- if (!*p)
- continue;
+static const struct fs_parameter_spec msdos_param_spec[] = {
+ fsparam_flag_no ("dots", Opt_dots),
+ fsparam_bool ("dotsOK", Opt_dotsOK),
+ {}
+};
- token = match_token(p, fat_tokens, args);
- if (token == Opt_err) {
- if (is_vfat)
- token = match_token(p, vfat_tokens, args);
- else
- token = match_token(p, msdos_tokens, args);
- }
- switch (token) {
- case Opt_check_s:
- opts->name_check = 's';
- break;
- case Opt_check_r:
- opts->name_check = 'r';
- break;
- case Opt_check_n:
- opts->name_check = 'n';
- break;
- case Opt_usefree:
- opts->usefree = 1;
- break;
- case Opt_nocase:
- if (!is_vfat)
- opts->nocase = 1;
- else {
- /* for backward compatibility */
- opts->shortname = VFAT_SFN_DISPLAY_WIN95
- | VFAT_SFN_CREATE_WIN95;
- }
- break;
- case Opt_quiet:
- opts->quiet = 1;
- break;
- case Opt_showexec:
- opts->showexec = 1;
- break;
- case Opt_debug:
- *debug = 1;
- break;
- case Opt_immutable:
- opts->sys_immutable = 1;
- break;
- case Opt_uid:
- if (match_int(&args[0], &option))
- return -EINVAL;
- opts->fs_uid = make_kuid(current_user_ns(), option);
- if (!uid_valid(opts->fs_uid))
- return -EINVAL;
- break;
- case Opt_gid:
- if (match_int(&args[0], &option))
- return -EINVAL;
- opts->fs_gid = make_kgid(current_user_ns(), option);
- if (!gid_valid(opts->fs_gid))
- return -EINVAL;
- break;
- case Opt_umask:
- if (match_octal(&args[0], &option))
- return -EINVAL;
- opts->fs_fmask = opts->fs_dmask = option;
- break;
- case Opt_dmask:
- if (match_octal(&args[0], &option))
- return -EINVAL;
- opts->fs_dmask = option;
- break;
- case Opt_fmask:
- if (match_octal(&args[0], &option))
- return -EINVAL;
- opts->fs_fmask = option;
- break;
- case Opt_allow_utime:
- if (match_octal(&args[0], &option))
- return -EINVAL;
- opts->allow_utime = option & (S_IWGRP | S_IWOTH);
- break;
- case Opt_codepage:
- if (match_int(&args[0], &option))
- return -EINVAL;
- opts->codepage = option;
- break;
- case Opt_flush:
- opts->flush = 1;
- break;
- case Opt_time_offset:
- if (match_int(&args[0], &option))
- return -EINVAL;
- if (option < -12 * 60 || option > 12 * 60)
- return -EINVAL;
- opts->tz_set = 1;
- opts->time_offset = option;
- break;
- case Opt_tz_utc:
- opts->tz_set = 1;
- opts->time_offset = 0;
- break;
- case Opt_err_cont:
- opts->errors = FAT_ERRORS_CONT;
- break;
- case Opt_err_panic:
- opts->errors = FAT_ERRORS_PANIC;
- break;
- case Opt_err_ro:
- opts->errors = FAT_ERRORS_RO;
- break;
- case Opt_nfs_stale_rw:
- opts->nfs = FAT_NFS_STALE_RW;
- break;
- case Opt_nfs_nostale_ro:
- opts->nfs = FAT_NFS_NOSTALE_RO;
- break;
+static const struct constant_table fat_param_shortname[] = {
+ {"lower", VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95},
+ {"win95", VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95},
+ {"winnt", VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT},
+ {"mixed", VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95},
+ {}
+};
- /* msdos specific */
- case Opt_dots:
- opts->dotsOK = 1;
- break;
- case Opt_nodots:
- opts->dotsOK = 0;
- break;
+static const struct fs_parameter_spec vfat_param_spec[] = {
+ fsparam_string ("iocharset", Opt_charset),
+ fsparam_enum ("shortname", Opt_shortname, fat_param_shortname),
+ fsparam_flag ("utf8", Opt_utf8),
+ fsparam_bool ("utf8", Opt_utf8_bool),
+ fsparam_flag ("uni_xlate", Opt_uni_xl),
+ fsparam_bool ("uni_xlate", Opt_uni_xl_bool),
+ fsparam_flag ("nonumtail", Opt_nonumtail),
+ fsparam_bool ("nonumtail", Opt_nonumtail_bool),
+ fsparam_flag ("rodir", Opt_rodir),
+ {}
+};
- /* vfat specific */
- case Opt_charset:
- if (opts->iocharset != fat_default_iocharset)
- kfree(opts->iocharset);
- iocharset = match_strdup(&args[0]);
- if (!iocharset)
- return -ENOMEM;
- opts->iocharset = iocharset;
- break;
- case Opt_shortname_lower:
- opts->shortname = VFAT_SFN_DISPLAY_LOWER
- | VFAT_SFN_CREATE_WIN95;
- break;
- case Opt_shortname_win95:
- opts->shortname = VFAT_SFN_DISPLAY_WIN95
- | VFAT_SFN_CREATE_WIN95;
- break;
- case Opt_shortname_winnt:
- opts->shortname = VFAT_SFN_DISPLAY_WINNT
- | VFAT_SFN_CREATE_WINNT;
- break;
- case Opt_shortname_mixed:
- opts->shortname = VFAT_SFN_DISPLAY_WINNT
- | VFAT_SFN_CREATE_WIN95;
- break;
- case Opt_utf8_no: /* 0 or no or false */
- opts->utf8 = 0;
- break;
- case Opt_utf8_yes: /* empty or 1 or yes or true */
- opts->utf8 = 1;
- break;
- case Opt_uni_xl_no: /* 0 or no or false */
- opts->unicode_xlate = 0;
- break;
- case Opt_uni_xl_yes: /* empty or 1 or yes or true */
- opts->unicode_xlate = 1;
- break;
- case Opt_nonumtail_no: /* 0 or no or false */
- opts->numtail = 1; /* negated option */
- break;
- case Opt_nonumtail_yes: /* empty or 1 or yes or true */
- opts->numtail = 0; /* negated option */
- break;
- case Opt_rodir:
- opts->rodir = 1;
- break;
- case Opt_discard:
- opts->discard = 1;
- break;
+int fat_parse_param(struct fs_context *fc, struct fs_parameter *param,
+ bool is_vfat)
+{
+ struct fat_mount_options *opts = fc->fs_private;
+ struct fs_parse_result result;
+ int opt;
- /* obsolete mount options */
- case Opt_obsolete:
- fat_msg(sb, KERN_INFO, "\"%s\" option is obsolete, "
- "not supported now", p);
- break;
- /* unknown option */
- default:
- if (!silent) {
- fat_msg(sb, KERN_ERR,
- "Unrecognized mount option \"%s\" "
- "or missing value", p);
- }
- return -EINVAL;
- }
- }
+ /* remount options have traditionally been ignored */
+ if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)
+ return 0;
-out:
- /* UTF-8 doesn't provide FAT semantics */
- if (!strcmp(opts->iocharset, "utf8")) {
- fat_msg(sb, KERN_WARNING, "utf8 is not a recommended IO charset"
- " for FAT filesystems, filesystem will be "
- "case sensitive!");
+ opt = fs_parse(fc, fat_param_spec, param, &result);
+ /* If option not found in fat_param_spec, try vfat/msdos options */
+ if (opt == -ENOPARAM) {
+ if (is_vfat)
+ opt = fs_parse(fc, vfat_param_spec, param, &result);
+ else
+ opt = fs_parse(fc, msdos_param_spec, param, &result);
}
- /* If user doesn't specify allow_utime, it's initialized from dmask. */
- if (opts->allow_utime == (unsigned short)-1)
- opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH);
- if (opts->unicode_xlate)
- opts->utf8 = 0;
- if (opts->nfs == FAT_NFS_NOSTALE_RO) {
- sb->s_flags |= MS_RDONLY;
- sb->s_export_op = &fat_export_ops_nostale;
+ if (opt < 0)
+ return opt;
+
+ switch (opt) {
+ case Opt_check:
+ opts->name_check = result.uint_32;
+ break;
+ case Opt_usefree:
+ opts->usefree = 1;
+ break;
+ case Opt_nocase:
+ if (!is_vfat)
+ opts->nocase = 1;
+ else {
+ /* for backward compatibility */
+ opts->shortname = VFAT_SFN_DISPLAY_WIN95
+ | VFAT_SFN_CREATE_WIN95;
+ }
+ break;
+ case Opt_quiet:
+ opts->quiet = 1;
+ break;
+ case Opt_showexec:
+ opts->showexec = 1;
+ break;
+ case Opt_debug:
+ opts->debug = 1;
+ break;
+ case Opt_immutable:
+ opts->sys_immutable = 1;
+ break;
+ case Opt_uid:
+ opts->fs_uid = result.uid;
+ break;
+ case Opt_gid:
+ opts->fs_gid = result.gid;
+ break;
+ case Opt_umask:
+ opts->fs_fmask = opts->fs_dmask = result.uint_32;
+ break;
+ case Opt_dmask:
+ opts->fs_dmask = result.uint_32;
+ break;
+ case Opt_fmask:
+ opts->fs_fmask = result.uint_32;
+ break;
+ case Opt_allow_utime:
+ opts->allow_utime = result.uint_32 & (S_IWGRP | S_IWOTH);
+ break;
+ case Opt_codepage:
+ opts->codepage = result.uint_32;
+ break;
+ case Opt_flush:
+ opts->flush = 1;
+ break;
+ case Opt_time_offset:
+ /*
+ * GMT+-12 zones may have DST corrections so at least
+ * 13 hours difference is needed. Make the limit 24
+ * just in case someone invents something unusual.
+ */
+ if (result.int_32 < -24 * 60 || result.int_32 > 24 * 60)
+ return -EINVAL;
+ opts->tz_set = 1;
+ opts->time_offset = result.int_32;
+ break;
+ case Opt_tz:
+ opts->tz_set = 1;
+ opts->time_offset = result.uint_32;
+ break;
+ case Opt_errors:
+ opts->errors = result.uint_32;
+ break;
+ case Opt_nfs:
+ opts->nfs = FAT_NFS_STALE_RW;
+ break;
+ case Opt_nfs_enum:
+ opts->nfs = result.uint_32;
+ break;
+ case Opt_dos1xfloppy:
+ opts->dos1xfloppy = 1;
+ break;
+
+ /* msdos specific */
+ case Opt_dots: /* dots / nodots */
+ opts->dotsOK = !result.negated;
+ break;
+ case Opt_dotsOK: /* dotsOK = yes/no */
+ opts->dotsOK = result.boolean;
+ break;
+
+ /* vfat specific */
+ case Opt_charset:
+ fat_reset_iocharset(opts);
+ opts->iocharset = param->string;
+ param->string = NULL; /* Steal string */
+ break;
+ case Opt_shortname:
+ opts->shortname = result.uint_32;
+ break;
+ case Opt_utf8:
+ opts->utf8 = 1;
+ break;
+ case Opt_utf8_bool:
+ opts->utf8 = result.boolean;
+ break;
+ case Opt_uni_xl:
+ opts->unicode_xlate = 1;
+ break;
+ case Opt_uni_xl_bool:
+ opts->unicode_xlate = result.boolean;
+ break;
+ case Opt_nonumtail:
+ opts->numtail = 0; /* negated option */
+ break;
+ case Opt_nonumtail_bool:
+ opts->numtail = !result.boolean; /* negated option */
+ break;
+ case Opt_rodir:
+ opts->rodir = 1;
+ break;
+ case Opt_discard:
+ opts->discard = 1;
+ break;
+
+ /* obsolete mount options */
+ case Opt_obsolete:
+ printk(KERN_INFO "FAT-fs: \"%s\" option is obsolete, "
+ "not supported now", param->key);
+ break;
+ default:
+ return -EINVAL;
}
return 0;
}
+EXPORT_SYMBOL_GPL(fat_parse_param);
static int fat_read_root(struct inode *inode)
{
- struct super_block *sb = inode->i_sb;
- struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
int error;
MSDOS_I(inode)->i_pos = MSDOS_ROOT_INO;
inode->i_uid = sbi->options.fs_uid;
inode->i_gid = sbi->options.fs_gid;
- inode->i_version++;
+ inode_inc_iversion(inode);
inode->i_generation = 0;
inode->i_mode = fat_make_mode(sbi, ATTR_DIR, S_IRWXUGO);
inode->i_op = sbi->dir_ops;
inode->i_fop = &fat_dir_operations;
- if (sbi->fat_bits == 32) {
+ if (is_fat32(sbi)) {
MSDOS_I(inode)->i_start = sbi->root_cluster;
error = fat_calc_dir_size(inode);
if (error < 0)
@@ -1222,8 +1343,8 @@ static int fat_read_root(struct inode *inode)
MSDOS_I(inode)->mmu_private = inode->i_size;
fat_save_attrs(inode, ATTR_DIR);
- inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0;
- inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0;
+ inode_set_mtime_to_ts(inode,
+ inode_set_atime_to_ts(inode, inode_set_ctime(inode, 0, 0)));
set_nlink(inode, fat_subdirs(inode)+2);
return 0;
@@ -1234,7 +1355,7 @@ static unsigned long calc_fat_clusters(struct super_block *sb)
struct msdos_sb_info *sbi = MSDOS_SB(sb);
/* Divide first to avoid overflow */
- if (sbi->fat_bits != 12) {
+ if (!is_fat12(sbi)) {
unsigned long ent_per_sec = sb->s_blocksize * 8 / sbi->fat_bits;
return ent_per_sec * sbi->fat_length;
}
@@ -1242,27 +1363,194 @@ static unsigned long calc_fat_clusters(struct super_block *sb)
return sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits;
}
+static bool fat_bpb_is_zero(struct fat_boot_sector *b)
+{
+ if (get_unaligned_le16(&b->sector_size))
+ return false;
+ if (b->sec_per_clus)
+ return false;
+ if (b->reserved)
+ return false;
+ if (b->fats)
+ return false;
+ if (get_unaligned_le16(&b->dir_entries))
+ return false;
+ if (get_unaligned_le16(&b->sectors))
+ return false;
+ if (b->media)
+ return false;
+ if (b->fat_length)
+ return false;
+ if (b->secs_track)
+ return false;
+ if (b->heads)
+ return false;
+ return true;
+}
+
+static int fat_read_bpb(struct super_block *sb, struct fat_boot_sector *b,
+ int silent, struct fat_bios_param_block *bpb)
+{
+ int error = -EINVAL;
+
+ /* Read in BPB ... */
+ memset(bpb, 0, sizeof(*bpb));
+ bpb->fat_sector_size = get_unaligned_le16(&b->sector_size);
+ bpb->fat_sec_per_clus = b->sec_per_clus;
+ bpb->fat_reserved = le16_to_cpu(b->reserved);
+ bpb->fat_fats = b->fats;
+ bpb->fat_dir_entries = get_unaligned_le16(&b->dir_entries);
+ bpb->fat_sectors = get_unaligned_le16(&b->sectors);
+ bpb->fat_fat_length = le16_to_cpu(b->fat_length);
+ bpb->fat_total_sect = le32_to_cpu(b->total_sect);
+
+ bpb->fat16_state = b->fat16.state;
+ bpb->fat16_vol_id = get_unaligned_le32(b->fat16.vol_id);
+
+ bpb->fat32_length = le32_to_cpu(b->fat32.length);
+ bpb->fat32_root_cluster = le32_to_cpu(b->fat32.root_cluster);
+ bpb->fat32_info_sector = le16_to_cpu(b->fat32.info_sector);
+ bpb->fat32_state = b->fat32.state;
+ bpb->fat32_vol_id = get_unaligned_le32(b->fat32.vol_id);
+
+ /* Validate this looks like a FAT filesystem BPB */
+ if (!bpb->fat_reserved) {
+ if (!silent)
+ fat_msg(sb, KERN_ERR,
+ "bogus number of reserved sectors");
+ goto out;
+ }
+ if (!bpb->fat_fats) {
+ if (!silent)
+ fat_msg(sb, KERN_ERR, "bogus number of FAT structure");
+ goto out;
+ }
+
+ /*
+ * Earlier we checked here that b->secs_track and b->head are nonzero,
+ * but it turns out valid FAT filesystems can have zero there.
+ */
+
+ if (!fat_valid_media(b->media)) {
+ if (!silent)
+ fat_msg(sb, KERN_ERR, "invalid media value (0x%02x)",
+ (unsigned)b->media);
+ goto out;
+ }
+
+ if (!is_power_of_2(bpb->fat_sector_size)
+ || (bpb->fat_sector_size < 512)
+ || (bpb->fat_sector_size > 4096)) {
+ if (!silent)
+ fat_msg(sb, KERN_ERR, "bogus logical sector size %u",
+ (unsigned)bpb->fat_sector_size);
+ goto out;
+ }
+
+ if (!is_power_of_2(bpb->fat_sec_per_clus)) {
+ if (!silent)
+ fat_msg(sb, KERN_ERR, "bogus sectors per cluster %u",
+ (unsigned)bpb->fat_sec_per_clus);
+ goto out;
+ }
+
+ if (bpb->fat_fat_length == 0 && bpb->fat32_length == 0) {
+ if (!silent)
+ fat_msg(sb, KERN_ERR, "bogus number of FAT sectors");
+ goto out;
+ }
+
+ error = 0;
+
+out:
+ return error;
+}
+
+static int fat_read_static_bpb(struct super_block *sb,
+ struct fat_boot_sector *b, int silent,
+ struct fat_bios_param_block *bpb)
+{
+ static const char *notdos1x = "This doesn't look like a DOS 1.x volume";
+ sector_t bd_sects = bdev_nr_sectors(sb->s_bdev);
+ struct fat_floppy_defaults *fdefaults = NULL;
+ int error = -EINVAL;
+ unsigned i;
+
+ /* 16-bit DOS 1.x reliably wrote bootstrap short-jmp code */
+ if (b->ignored[0] != 0xeb || b->ignored[2] != 0x90) {
+ if (!silent)
+ fat_msg(sb, KERN_ERR,
+ "%s; no bootstrapping code", notdos1x);
+ goto out;
+ }
+
+ /*
+ * If any value in this region is non-zero, it isn't archaic
+ * DOS.
+ */
+ if (!fat_bpb_is_zero(b)) {
+ if (!silent)
+ fat_msg(sb, KERN_ERR,
+ "%s; DOS 2.x BPB is non-zero", notdos1x);
+ goto out;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(floppy_defaults); i++) {
+ if (floppy_defaults[i].nr_sectors == bd_sects) {
+ fdefaults = &floppy_defaults[i];
+ break;
+ }
+ }
+
+ if (fdefaults == NULL) {
+ if (!silent)
+ fat_msg(sb, KERN_WARNING,
+ "This looks like a DOS 1.x volume, but isn't a recognized floppy size (%llu sectors)",
+ (u64)bd_sects);
+ goto out;
+ }
+
+ if (!silent)
+ fat_msg(sb, KERN_INFO,
+ "This looks like a DOS 1.x volume; assuming default BPB values");
+
+ memset(bpb, 0, sizeof(*bpb));
+ bpb->fat_sector_size = SECTOR_SIZE;
+ bpb->fat_sec_per_clus = fdefaults->sec_per_clus;
+ bpb->fat_reserved = 1;
+ bpb->fat_fats = 2;
+ bpb->fat_dir_entries = fdefaults->dir_entries;
+ bpb->fat_sectors = fdefaults->nr_sectors;
+ bpb->fat_fat_length = fdefaults->fat_length;
+
+ error = 0;
+
+out:
+ return error;
+}
+
/*
* Read the super block of an MS-DOS FS.
*/
-int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
+int fat_fill_super(struct super_block *sb, struct fs_context *fc,
void (*setup)(struct super_block *))
{
+ struct fat_mount_options *opts = fc->fs_private;
+ int silent = fc->sb_flags & SB_SILENT;
struct inode *root_inode = NULL, *fat_inode = NULL;
struct inode *fsinfo_inode = NULL;
struct buffer_head *bh;
- struct fat_boot_sector *b;
+ struct fat_bios_param_block bpb;
struct msdos_sb_info *sbi;
u16 logical_sector_size;
u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors;
- int debug;
- unsigned int media;
long error;
char buf[50];
+ struct timespec64 ts;
/*
* GFP_KERNEL is ok here, because while we do hold the
- * supeblock lock, memory pressure can't call back into
+ * superblock lock, memory pressure can't call back into
* the filesystem, since we're only just about to mount
* it and have no inodes etc active!
*/
@@ -1271,122 +1559,127 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
return -ENOMEM;
sb->s_fs_info = sbi;
- sb->s_flags |= MS_NODIRATIME;
+ sb->s_flags |= SB_NODIRATIME;
sb->s_magic = MSDOS_SUPER_MAGIC;
sb->s_op = &fat_sops;
sb->s_export_op = &fat_export_ops;
+ /*
+ * fat timestamps are complex and truncated by fat itself, so
+ * we set 1 here to be fast
+ */
+ sb->s_time_gran = 1;
mutex_init(&sbi->nfs_build_inode_lock);
ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
- error = parse_options(sb, data, isvfat, silent, &debug, &sbi->options);
- if (error)
- goto out_fail;
+ /* UTF-8 doesn't provide FAT semantics */
+ if (!strcmp(opts->iocharset, "utf8")) {
+ fat_msg(sb, KERN_WARNING, "utf8 is not a recommended IO charset"
+ " for FAT filesystems, filesystem will be"
+ " case sensitive!");
+ }
+
+ /* If user doesn't specify allow_utime, it's initialized from dmask. */
+ if (opts->allow_utime == (unsigned short)-1)
+ opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH);
+ if (opts->unicode_xlate)
+ opts->utf8 = 0;
+ if (opts->nfs == FAT_NFS_NOSTALE_RO) {
+ sb->s_flags |= SB_RDONLY;
+ sb->s_export_op = &fat_export_ops_nostale;
+ }
+
+ /* Apply parsed options to sbi (structure copy) */
+ sbi->options = *opts;
+ /* Transfer ownership of iocharset to sbi->options */
+ opts->iocharset = NULL;
setup(sb); /* flavour-specific stuff that needs options */
+ error = -EINVAL;
+ if (!sb_min_blocksize(sb, 512)) {
+ fat_msg(sb, KERN_ERR, "unable to set blocksize");
+ goto out_fail;
+ }
error = -EIO;
- sb_min_blocksize(sb, 512);
bh = sb_bread(sb, 0);
if (bh == NULL) {
fat_msg(sb, KERN_ERR, "unable to read boot sector");
goto out_fail;
}
- b = (struct fat_boot_sector *) bh->b_data;
- if (!b->reserved) {
- if (!silent)
- fat_msg(sb, KERN_ERR, "bogus number of reserved sectors");
- brelse(bh);
- goto out_invalid;
- }
- if (!b->fats) {
- if (!silent)
- fat_msg(sb, KERN_ERR, "bogus number of FAT structure");
- brelse(bh);
- goto out_invalid;
- }
-
- /*
- * Earlier we checked here that b->secs_track and b->head are nonzero,
- * but it turns out valid FAT filesystems can have zero there.
- */
+ error = fat_read_bpb(sb, (struct fat_boot_sector *)bh->b_data, silent,
+ &bpb);
+ if (error == -EINVAL && sbi->options.dos1xfloppy)
+ error = fat_read_static_bpb(sb,
+ (struct fat_boot_sector *)bh->b_data, silent, &bpb);
+ brelse(bh);
- media = b->media;
- if (!fat_valid_media(media)) {
- if (!silent)
- fat_msg(sb, KERN_ERR, "invalid media value (0x%02x)",
- media);
- brelse(bh);
- goto out_invalid;
- }
- logical_sector_size = get_unaligned_le16(&b->sector_size);
- if (!is_power_of_2(logical_sector_size)
- || (logical_sector_size < 512)
- || (logical_sector_size > 4096)) {
- if (!silent)
- fat_msg(sb, KERN_ERR, "bogus logical sector size %u",
- logical_sector_size);
- brelse(bh);
+ if (error == -EINVAL)
goto out_invalid;
- }
- sbi->sec_per_clus = b->sec_per_clus;
- if (!is_power_of_2(sbi->sec_per_clus)) {
- if (!silent)
- fat_msg(sb, KERN_ERR, "bogus sectors per cluster %u",
- sbi->sec_per_clus);
- brelse(bh);
- goto out_invalid;
- }
+ else if (error)
+ goto out_fail;
+ logical_sector_size = bpb.fat_sector_size;
+ sbi->sec_per_clus = bpb.fat_sec_per_clus;
+
+ error = -EIO;
if (logical_sector_size < sb->s_blocksize) {
fat_msg(sb, KERN_ERR, "logical sector size too small for device"
" (logical sector size = %u)", logical_sector_size);
- brelse(bh);
goto out_fail;
}
+
if (logical_sector_size > sb->s_blocksize) {
- brelse(bh);
+ struct buffer_head *bh_resize;
if (!sb_set_blocksize(sb, logical_sector_size)) {
fat_msg(sb, KERN_ERR, "unable to set blocksize %u",
logical_sector_size);
goto out_fail;
}
- bh = sb_bread(sb, 0);
- if (bh == NULL) {
+
+ /* Verify that the larger boot sector is fully readable */
+ bh_resize = sb_bread(sb, 0);
+ if (bh_resize == NULL) {
fat_msg(sb, KERN_ERR, "unable to read boot sector"
" (logical sector size = %lu)",
sb->s_blocksize);
goto out_fail;
}
- b = (struct fat_boot_sector *) bh->b_data;
+ brelse(bh_resize);
}
mutex_init(&sbi->s_lock);
sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus;
sbi->cluster_bits = ffs(sbi->cluster_size) - 1;
- sbi->fats = b->fats;
+ sbi->fats = bpb.fat_fats;
sbi->fat_bits = 0; /* Don't know yet */
- sbi->fat_start = le16_to_cpu(b->reserved);
- sbi->fat_length = le16_to_cpu(b->fat_length);
+ sbi->fat_start = bpb.fat_reserved;
+ sbi->fat_length = bpb.fat_fat_length;
sbi->root_cluster = 0;
sbi->free_clusters = -1; /* Don't know yet */
sbi->free_clus_valid = 0;
sbi->prev_free = FAT_START_ENT;
sb->s_maxbytes = 0xffffffff;
+ fat_time_fat2unix(sbi, &ts, 0, cpu_to_le16(FAT_DATE_MIN), 0);
+ sb->s_time_min = ts.tv_sec;
+
+ fat_time_fat2unix(sbi, &ts, cpu_to_le16(FAT_TIME_MAX),
+ cpu_to_le16(FAT_DATE_MAX), 0);
+ sb->s_time_max = ts.tv_sec;
- if (!sbi->fat_length && b->fat32.length) {
+ if (!sbi->fat_length && bpb.fat32_length) {
struct fat_boot_fsinfo *fsinfo;
struct buffer_head *fsinfo_bh;
/* Must be FAT32 */
sbi->fat_bits = 32;
- sbi->fat_length = le32_to_cpu(b->fat32.length);
- sbi->root_cluster = le32_to_cpu(b->fat32.root_cluster);
+ sbi->fat_length = bpb.fat32_length;
+ sbi->root_cluster = bpb.fat32_root_cluster;
/* MC - if info_sector is 0, don't multiply by 0 */
- sbi->fsinfo_sector = le16_to_cpu(b->fat32.info_sector);
+ sbi->fsinfo_sector = bpb.fat32_info_sector;
if (sbi->fsinfo_sector == 0)
sbi->fsinfo_sector = 1;
@@ -1394,7 +1687,6 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
if (fsinfo_bh == NULL) {
fat_msg(sb, KERN_ERR, "bread failed, FSINFO block"
" (sector = %lu)", sbi->fsinfo_sector);
- brelse(bh);
goto out_fail;
}
@@ -1416,56 +1708,51 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
}
/* interpret volume ID as a little endian 32 bit integer */
- if (sbi->fat_bits == 32)
- sbi->vol_id = (((u32)b->fat32.vol_id[0]) |
- ((u32)b->fat32.vol_id[1] << 8) |
- ((u32)b->fat32.vol_id[2] << 16) |
- ((u32)b->fat32.vol_id[3] << 24));
+ if (is_fat32(sbi))
+ sbi->vol_id = bpb.fat32_vol_id;
else /* fat 16 or 12 */
- sbi->vol_id = (((u32)b->fat16.vol_id[0]) |
- ((u32)b->fat16.vol_id[1] << 8) |
- ((u32)b->fat16.vol_id[2] << 16) |
- ((u32)b->fat16.vol_id[3] << 24));
+ sbi->vol_id = bpb.fat16_vol_id;
+
+ __le32 vol_id_le = cpu_to_le32(sbi->vol_id);
+ super_set_uuid(sb, (void *) &vol_id_le, sizeof(vol_id_le));
sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry);
sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1;
sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length;
- sbi->dir_entries = get_unaligned_le16(&b->dir_entries);
+ sbi->dir_entries = bpb.fat_dir_entries;
if (sbi->dir_entries & (sbi->dir_per_block - 1)) {
if (!silent)
- fat_msg(sb, KERN_ERR, "bogus directory-entries per block"
+ fat_msg(sb, KERN_ERR, "bogus number of directory entries"
" (%u)", sbi->dir_entries);
- brelse(bh);
goto out_invalid;
}
rootdir_sectors = sbi->dir_entries
* sizeof(struct msdos_dir_entry) / sb->s_blocksize;
sbi->data_start = sbi->dir_start + rootdir_sectors;
- total_sectors = get_unaligned_le16(&b->sectors);
+ total_sectors = bpb.fat_sectors;
if (total_sectors == 0)
- total_sectors = le32_to_cpu(b->total_sect);
+ total_sectors = bpb.fat_total_sect;
total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus;
- if (sbi->fat_bits != 32)
+ if (!is_fat32(sbi))
sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12;
/* some OSes set FAT_STATE_DIRTY and clean it on unmount. */
- if (sbi->fat_bits == 32)
- sbi->dirty = b->fat32.state & FAT_STATE_DIRTY;
+ if (is_fat32(sbi))
+ sbi->dirty = bpb.fat32_state & FAT_STATE_DIRTY;
else /* fat 16 or 12 */
- sbi->dirty = b->fat16.state & FAT_STATE_DIRTY;
+ sbi->dirty = bpb.fat16_state & FAT_STATE_DIRTY;
/* check that FAT table does not overflow */
fat_clusters = calc_fat_clusters(sb);
total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT);
- if (total_clusters > MAX_FAT(sb)) {
+ if (total_clusters > max_fat(sb)) {
if (!silent)
fat_msg(sb, KERN_ERR, "count of clusters too big (%u)",
total_clusters);
- brelse(bh);
goto out_invalid;
}
@@ -1478,19 +1765,21 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
if (sbi->prev_free < FAT_START_ENT)
sbi->prev_free = FAT_START_ENT;
- brelse(bh);
-
/* set up enough so that it can read an inode */
fat_hash_init(sb);
dir_hash_init(sb);
fat_ent_access_init(sb);
/*
- * The low byte of FAT's first entry must have same value with
- * media-field. But in real world, too many devices is
- * writing wrong value. So, removed that validity check.
+ * The low byte of the first FAT entry must have the same value as
+ * the media field of the boot sector. But in real world, too many
+ * devices are writing wrong values. So, removed that validity check.
*
- * if (FAT_FIRST_ENT(sb, media) != first)
+ * The removed check compared the first FAT entry to a value dependent
+ * on the media field like this:
+ * == (0x0F00 | media), for FAT12
+ * == (0XFF00 | media), for FAT16
+ * == (0x0FFFFF | media), for FAT32
*/
error = -EINVAL;
@@ -1515,7 +1804,6 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
fat_inode = new_inode(sb);
if (!fat_inode)
goto out_fail;
- MSDOS_I(fat_inode)->i_pos = 0;
sbi->fat_inode = fat_inode;
fsinfo_inode = new_inode(sb);
@@ -1529,7 +1817,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
if (!root_inode)
goto out_fail;
root_inode->i_ino = MSDOS_ROOT_INO;
- root_inode->i_version = 1;
+ inode_set_iversion(root_inode, 1);
error = fat_read_root(root_inode);
if (error < 0) {
iput(root_inode);
@@ -1544,13 +1832,9 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
goto out_fail;
}
- if (sbi->options.discard) {
- struct request_queue *q = bdev_get_queue(sb->s_bdev);
- if (!blk_queue_discard(q))
- fat_msg(sb, KERN_WARNING,
- "mounting with \"discard\" option, but "
- "the device does not support discard");
- }
+ if (sbi->options.discard && !bdev_max_discard_sectors(sb->s_bdev))
+ fat_msg(sb, KERN_WARNING,
+ "mounting with \"discard\" option, but the device does not support discard");
fat_set_state(sb, 1, 0);
return 0;
@@ -1561,14 +1845,11 @@ out_invalid:
fat_msg(sb, KERN_INFO, "Can't find a valid FAT filesystem");
out_fail:
- if (fsinfo_inode)
- iput(fsinfo_inode);
- if (fat_inode)
- iput(fat_inode);
+ iput(fsinfo_inode);
+ iput(fat_inode);
unload_nls(sbi->nls_io);
unload_nls(sbi->nls_disk);
- if (sbi->options.iocharset != fat_default_iocharset)
- kfree(sbi->options.iocharset);
+ fat_reset_iocharset(&sbi->options);
sb->s_fs_info = NULL;
kfree(sbi);
return error;
@@ -1614,14 +1895,63 @@ int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2)
ret = writeback_inode(i1);
if (!ret && i2)
ret = writeback_inode(i2);
- if (!ret) {
- struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
- ret = filemap_flush(mapping);
- }
+ if (!ret)
+ ret = sync_blockdev_nowait(sb->s_bdev);
return ret;
}
EXPORT_SYMBOL_GPL(fat_flush_inodes);
+int fat_init_fs_context(struct fs_context *fc, bool is_vfat)
+{
+ struct fat_mount_options *opts;
+
+ opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+ if (!opts)
+ return -ENOMEM;
+
+ opts->isvfat = is_vfat;
+ opts->fs_uid = current_uid();
+ opts->fs_gid = current_gid();
+ opts->fs_fmask = opts->fs_dmask = current_umask();
+ opts->allow_utime = -1;
+ opts->codepage = fat_default_codepage;
+ fat_reset_iocharset(opts);
+ if (is_vfat) {
+ opts->shortname = VFAT_SFN_DISPLAY_WINNT|VFAT_SFN_CREATE_WIN95;
+ opts->rodir = 0;
+ } else {
+ opts->shortname = 0;
+ opts->rodir = 1;
+ }
+ opts->name_check = 'n';
+ opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0;
+ opts->unicode_xlate = 0;
+ opts->numtail = 1;
+ opts->usefree = opts->nocase = 0;
+ opts->tz_set = 0;
+ opts->nfs = 0;
+ opts->errors = FAT_ERRORS_RO;
+ opts->debug = 0;
+
+ opts->utf8 = IS_ENABLED(CONFIG_FAT_DEFAULT_UTF8) && is_vfat;
+
+ fc->fs_private = opts;
+ /* fc->ops assigned by caller */
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fat_init_fs_context);
+
+void fat_free_fc(struct fs_context *fc)
+{
+ struct fat_mount_options *opts = fc->fs_private;
+
+ if (opts->iocharset != fat_default_iocharset)
+ kfree(opts->iocharset);
+ kfree(fc->fs_private);
+}
+EXPORT_SYMBOL_GPL(fat_free_fc);
+
static int __init init_fat_fs(void)
{
int err;
@@ -1650,4 +1980,5 @@ static void __exit exit_fat_fs(void)
module_init(init_fat_fs)
module_exit(exit_fat_fs)
+MODULE_DESCRIPTION("Core FAT filesystem support");
MODULE_LICENSE("GPL");
diff --git a/fs/fat/misc.c b/fs/fat/misc.c
index 628e22a5a543..950da09f0961 100644
--- a/fs/fat/misc.c
+++ b/fs/fat/misc.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/fs/fat/misc.c
*
@@ -6,11 +7,8 @@
* and date_dos2unix for date==0 by Igor Zhbanov(bsg@uniyar.ac.ru)
*/
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/buffer_head.h>
-#include <linux/time.h>
#include "fat.h"
+#include <linux/iversion.h>
/*
* fat_fs_error reports a file system problem that might indicate fa data
@@ -36,18 +34,24 @@ void __fat_fs_error(struct super_block *sb, int report, const char *fmt, ...)
if (opts->errors == FAT_ERRORS_PANIC)
panic("FAT-fs (%s): fs panic from previous error\n", sb->s_id);
- else if (opts->errors == FAT_ERRORS_RO && !(sb->s_flags & MS_RDONLY)) {
- sb->s_flags |= MS_RDONLY;
+ else if (opts->errors == FAT_ERRORS_RO && !sb_rdonly(sb)) {
+ sb->s_flags |= SB_RDONLY;
fat_msg(sb, KERN_ERR, "Filesystem has been set read-only");
}
}
EXPORT_SYMBOL_GPL(__fat_fs_error);
/**
- * fat_msg() - print preformated FAT specific messages. Every thing what is
- * not fat_fs_error() should be fat_msg().
+ * _fat_msg() - Print a preformatted FAT message based on a superblock.
+ * @sb: A pointer to a &struct super_block
+ * @level: A Kernel printk level constant
+ * @fmt: The printf-style format string to print.
+ *
+ * Everything that is not fat_fs_error() should be fat_msg().
+ *
+ * fat_msg() wraps _fat_msg() for printk indexing.
*/
-void fat_msg(struct super_block *sb, const char *level, const char *fmt, ...)
+void _fat_msg(struct super_block *sb, const char *level, const char *fmt, ...)
{
struct va_format vaf;
va_list args;
@@ -55,7 +59,7 @@ void fat_msg(struct super_block *sb, const char *level, const char *fmt, ...)
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
- printk("%sFAT-fs (%s): %pV\n", level, sb->s_id, &vaf);
+ _printk(FAT_PRINTK_PREFIX "%pV\n", level, sb->s_id, &vaf);
va_end(args);
}
@@ -67,7 +71,7 @@ int fat_clusters_flush(struct super_block *sb)
struct buffer_head *bh;
struct fat_boot_fsinfo *fsinfo;
- if (sbi->fat_bits != 32)
+ if (!is_fat32(sbi))
return 0;
bh = sb_bread(sb, sbi->fsinfo_sector);
@@ -154,9 +158,9 @@ int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster)
mark_inode_dirty(inode);
}
if (new_fclus != (inode->i_blocks >> (sbi->cluster_bits - 9))) {
- fat_fs_error(sb, "clusters badly computed (%d != %llu)",
- new_fclus,
- (llu)(inode->i_blocks >> (sbi->cluster_bits - 9)));
+ fat_fs_error_ratelimit(
+ sb, "clusters badly computed (%d != %llu)", new_fclus,
+ (llu)(inode->i_blocks >> (sbi->cluster_bits - 9)));
fat_cache_inval_inode(inode);
}
inode->i_blocks += nr_cluster << (sbi->cluster_bits - 9);
@@ -164,8 +168,6 @@ int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster)
return 0;
}
-extern struct timezone sys_tz;
-
/*
* The epoch of FAT timestamp is 1980.
* : bits : value
@@ -186,17 +188,25 @@ extern struct timezone sys_tz;
#define IS_LEAP_YEAR(y) (!((y) & 3) && (y) != YEAR_2100)
/* Linear day numbers of the respective 1sts in non-leap years. */
-static time_t days_in_year[] = {
+static long days_in_year[] = {
/* Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec */
0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0,
};
+static inline int fat_tz_offset(const struct msdos_sb_info *sbi)
+{
+ return (sbi->options.tz_set ?
+ -sbi->options.time_offset :
+ sys_tz.tz_minuteswest) * SECS_PER_MIN;
+}
+
/* Convert a FAT time/date pair to a UNIX date (seconds since 1 1 70). */
-void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts,
+void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec64 *ts,
__le16 __time, __le16 __date, u8 time_cs)
{
u16 time = le16_to_cpu(__time), date = le16_to_cpu(__date);
- time_t second, day, leap_day, month, year;
+ time64_t second;
+ long day, leap_day, month, year;
year = date >> 9;
month = max(1, (date >> 5) & 0xf);
@@ -211,14 +221,11 @@ void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts,
second = (time & 0x1f) << 1;
second += ((time >> 5) & 0x3f) * SECS_PER_MIN;
second += (time >> 11) * SECS_PER_HOUR;
- second += (year * 365 + leap_day
+ second += (time64_t)(year * 365 + leap_day
+ days_in_year[month] + day
+ DAYS_DELTA) * SECS_PER_DAY;
- if (!sbi->options.tz_set)
- second += sys_tz.tz_minuteswest * SECS_PER_MIN;
- else
- second -= sbi->options.time_offset * SECS_PER_MIN;
+ second += fat_tz_offset(sbi);
if (time_cs) {
ts->tv_sec = second + (time_cs / 100);
@@ -229,14 +236,15 @@ void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts,
}
}
+/* Export fat_time_fat2unix() for the fat_test KUnit tests. */
+EXPORT_SYMBOL_GPL(fat_time_fat2unix);
+
/* Convert linear UNIX date to a FAT time/date pair. */
-void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts,
+void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec64 *ts,
__le16 *time, __le16 *date, u8 *time_cs)
{
struct tm tm;
- time_to_tm(ts->tv_sec,
- (sbi->options.tz_set ? sbi->options.time_offset :
- -sys_tz.tz_minuteswest) * SECS_PER_MIN, &tm);
+ time64_to_tm(ts->tv_sec, -fat_tz_offset(sbi), &tm);
/* FAT can only support year between 1980 to 2107 */
if (tm.tm_year < 1980 - 1900) {
@@ -268,12 +276,95 @@ void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts,
}
EXPORT_SYMBOL_GPL(fat_time_unix2fat);
+static inline struct timespec64 fat_timespec64_trunc_2secs(struct timespec64 ts)
+{
+ return (struct timespec64){ ts.tv_sec & ~1ULL, 0 };
+}
+
+/*
+ * truncate atime to 24 hour granularity (00:00:00 in local timezone)
+ */
+struct timespec64 fat_truncate_atime(const struct msdos_sb_info *sbi,
+ const struct timespec64 *ts)
+{
+ /* to localtime */
+ time64_t seconds = ts->tv_sec - fat_tz_offset(sbi);
+ s32 remainder;
+
+ div_s64_rem(seconds, SECS_PER_DAY, &remainder);
+ /* to day boundary, and back to unix time */
+ seconds = seconds + fat_tz_offset(sbi) - remainder;
+
+ return (struct timespec64){ seconds, 0 };
+}
+
+/*
+ * truncate mtime to 2 second granularity
+ */
+struct timespec64 fat_truncate_mtime(const struct msdos_sb_info *sbi,
+ const struct timespec64 *ts)
+{
+ return fat_timespec64_trunc_2secs(*ts);
+}
+
+/*
+ * truncate the various times with appropriate granularity:
+ * all times in root node are always 0
+ */
+int fat_truncate_time(struct inode *inode, struct timespec64 *now, int flags)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+ struct timespec64 ts;
+
+ if (inode->i_ino == MSDOS_ROOT_INO)
+ return 0;
+
+ if (now == NULL) {
+ now = &ts;
+ ts = current_time(inode);
+ }
+
+ if (flags & S_ATIME)
+ inode_set_atime_to_ts(inode, fat_truncate_atime(sbi, now));
+ /*
+ * ctime and mtime share the same on-disk field, and should be
+ * identical in memory. all mtime updates will be applied to ctime,
+ * but ctime updates are ignored.
+ */
+ if (flags & S_MTIME)
+ inode_set_mtime_to_ts(inode,
+ inode_set_ctime_to_ts(inode, fat_truncate_mtime(sbi, now)));
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fat_truncate_time);
+
+int fat_update_time(struct inode *inode, int flags)
+{
+ int dirty_flags = 0;
+
+ if (inode->i_ino == MSDOS_ROOT_INO)
+ return 0;
+
+ if (flags & (S_ATIME | S_CTIME | S_MTIME)) {
+ fat_truncate_time(inode, NULL, flags);
+ if (inode->i_sb->s_flags & SB_LAZYTIME)
+ dirty_flags |= I_DIRTY_TIME;
+ else
+ dirty_flags |= I_DIRTY_SYNC;
+ }
+
+ __mark_inode_dirty(inode, dirty_flags);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fat_update_time);
+
int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs)
{
int i, err = 0;
for (i = 0; i < nr_bhs; i++)
- write_dirty_buffer(bhs[i], WRITE);
+ write_dirty_buffer(bhs[i], 0);
for (i = 0; i < nr_bhs; i++) {
wait_on_buffer(bhs[i]);
diff --git a/fs/fat/namei_msdos.c b/fs/fat/namei_msdos.c
index a783b0e1272a..0b920ee40a7f 100644
--- a/fs/fat/namei_msdos.c
+++ b/fs/fat/namei_msdos.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/fs/msdos/namei.c
*
@@ -7,8 +8,7 @@
*/
#include <linux/module.h>
-#include <linux/time.h>
-#include <linux/buffer_head.h>
+#include <linux/iversion.h>
#include "fat.h"
/* Characters that are undesirable in an MS-DOS file name */
@@ -156,7 +156,7 @@ static int msdos_hash(const struct dentry *dentry, struct qstr *qstr)
error = msdos_format_name(qstr->name, qstr->len, msdos_name, options);
if (!error)
- qstr->hash = full_name_hash(msdos_name, MSDOS_NAME);
+ qstr->hash = full_name_hash(dentry, msdos_name, MSDOS_NAME);
return 0;
}
@@ -164,10 +164,10 @@ static int msdos_hash(const struct dentry *dentry, struct qstr *qstr)
* Compare two msdos names. If either of the names are invalid,
* we fall back to doing the standard name comparison.
*/
-static int msdos_cmp(const struct dentry *parent, const struct dentry *dentry,
+static int msdos_cmp(const struct dentry *dentry,
unsigned int len, const char *str, const struct qstr *name)
{
- struct fat_mount_options *options = &MSDOS_SB(parent->d_sb)->options;
+ struct fat_mount_options *options = &MSDOS_SB(dentry->d_sb)->options;
unsigned char a_msdos_name[MSDOS_NAME], b_msdos_name[MSDOS_NAME];
int error;
@@ -226,7 +226,7 @@ static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
/***** Creates a directory entry (name is already formatted). */
static int msdos_add_entry(struct inode *dir, const unsigned char *name,
int is_dir, int is_hid, int cluster,
- struct timespec *ts, struct fat_slot_info *sinfo)
+ struct timespec64 *ts, struct fat_slot_info *sinfo)
{
struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
struct msdos_dir_entry de;
@@ -251,7 +251,7 @@ static int msdos_add_entry(struct inode *dir, const unsigned char *name,
if (err)
return err;
- dir->i_ctime = dir->i_mtime = *ts;
+ fat_truncate_time(dir, ts, S_CTIME|S_MTIME);
if (IS_DIRSYNC(dir))
(void)fat_sync_inode(dir);
else
@@ -261,13 +261,13 @@ static int msdos_add_entry(struct inode *dir, const unsigned char *name,
}
/***** Create a file */
-static int msdos_create(struct inode *dir, struct dentry *dentry, umode_t mode,
- bool excl)
+static int msdos_create(struct mnt_idmap *idmap, struct inode *dir,
+ struct dentry *dentry, umode_t mode, bool excl)
{
struct super_block *sb = dir->i_sb;
struct inode *inode = NULL;
struct fat_slot_info sinfo;
- struct timespec ts;
+ struct timespec64 ts;
unsigned char msdos_name[MSDOS_NAME];
int err, is_hid;
@@ -285,7 +285,7 @@ static int msdos_create(struct inode *dir, struct dentry *dentry, umode_t mode,
goto out;
}
- ts = CURRENT_TIME_SEC;
+ ts = current_time(dir);
err = msdos_add_entry(dir, msdos_name, 0, is_hid, 0, &ts, &sinfo);
if (err)
goto out;
@@ -295,7 +295,7 @@ static int msdos_create(struct inode *dir, struct dentry *dentry, umode_t mode,
err = PTR_ERR(inode);
goto out;
}
- inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
+ fat_truncate_time(inode, &ts, S_ATIME|S_CTIME|S_MTIME);
/* timestamp is already written, so mark_inode_dirty() is unneeded. */
d_instantiate(dentry, inode);
@@ -310,15 +310,11 @@ out:
static int msdos_rmdir(struct inode *dir, struct dentry *dentry)
{
struct super_block *sb = dir->i_sb;
- struct inode *inode = dentry->d_inode;
+ struct inode *inode = d_inode(dentry);
struct fat_slot_info sinfo;
int err;
mutex_lock(&MSDOS_SB(sb)->s_lock);
- /*
- * Check whether the directory is not in use, then check
- * whether it is empty.
- */
err = fat_dir_empty(inode);
if (err)
goto out;
@@ -332,7 +328,7 @@ static int msdos_rmdir(struct inode *dir, struct dentry *dentry)
drop_nlink(dir);
clear_nlink(inode);
- inode->i_ctime = CURRENT_TIME_SEC;
+ fat_truncate_time(inode, NULL, S_CTIME);
fat_detach(inode);
out:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
@@ -343,13 +339,14 @@ out:
}
/***** Make a directory */
-static int msdos_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static struct dentry *msdos_mkdir(struct mnt_idmap *idmap, struct inode *dir,
+ struct dentry *dentry, umode_t mode)
{
struct super_block *sb = dir->i_sb;
struct fat_slot_info sinfo;
struct inode *inode;
unsigned char msdos_name[MSDOS_NAME];
- struct timespec ts;
+ struct timespec64 ts;
int err, is_hid, cluster;
mutex_lock(&MSDOS_SB(sb)->s_lock);
@@ -366,7 +363,7 @@ static int msdos_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
goto out;
}
- ts = CURRENT_TIME_SEC;
+ ts = current_time(dir);
cluster = fat_alloc_new_dir(dir, &ts);
if (cluster < 0) {
err = cluster;
@@ -385,26 +382,26 @@ static int msdos_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
goto out;
}
set_nlink(inode, 2);
- inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
+ fat_truncate_time(inode, &ts, S_ATIME|S_CTIME|S_MTIME);
/* timestamp is already written, so mark_inode_dirty() is unneeded. */
d_instantiate(dentry, inode);
mutex_unlock(&MSDOS_SB(sb)->s_lock);
fat_flush_inodes(sb, dir, inode);
- return 0;
+ return NULL;
out_free:
fat_free_clusters(dir, cluster);
out:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
- return err;
+ return ERR_PTR(err);
}
/***** Unlink a file */
static int msdos_unlink(struct inode *dir, struct dentry *dentry)
{
- struct inode *inode = dentry->d_inode;
+ struct inode *inode = d_inode(dentry);
struct super_block *sb = inode->i_sb;
struct fat_slot_info sinfo;
int err;
@@ -418,7 +415,7 @@ static int msdos_unlink(struct inode *dir, struct dentry *dentry)
if (err)
goto out;
clear_nlink(inode);
- inode->i_ctime = CURRENT_TIME_SEC;
+ fat_truncate_time(inode, NULL, S_CTIME);
fat_detach(inode);
out:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
@@ -437,13 +434,13 @@ static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
struct msdos_dir_entry *dotdot_de;
struct inode *old_inode, *new_inode;
struct fat_slot_info old_sinfo, sinfo;
- struct timespec ts;
+ struct timespec64 ts;
loff_t new_i_pos;
int err, old_attrs, is_dir, update_dotdot, corrupt = 0;
old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
- old_inode = old_dentry->d_inode;
- new_inode = new_dentry->d_inode;
+ old_inode = d_inode(old_dentry);
+ new_inode = d_inode(new_dentry);
err = fat_scan(old_dir, old_name, &old_sinfo);
if (err) {
@@ -482,8 +479,8 @@ static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
} else
mark_inode_dirty(old_inode);
- old_dir->i_version++;
- old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
+ inode_inc_iversion(old_dir);
+ fat_truncate_time(old_dir, NULL, S_CTIME|S_MTIME);
if (IS_DIRSYNC(old_dir))
(void)fat_sync_inode(old_dir);
else
@@ -492,7 +489,7 @@ static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
}
}
- ts = CURRENT_TIME_SEC;
+ ts = current_time(old_inode);
if (new_inode) {
if (err)
goto out;
@@ -510,7 +507,7 @@ static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
goto out;
new_i_pos = sinfo.i_pos;
}
- new_dir->i_version++;
+ inode_inc_iversion(new_dir);
fat_detach(old_inode);
fat_attach(old_inode, new_i_pos);
@@ -542,8 +539,8 @@ static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
old_sinfo.bh = NULL;
if (err)
goto error_dotdot;
- old_dir->i_version++;
- old_dir->i_ctime = old_dir->i_mtime = ts;
+ inode_inc_iversion(old_dir);
+ fat_truncate_time(old_dir, &ts, S_CTIME|S_MTIME);
if (IS_DIRSYNC(old_dir))
(void)fat_sync_inode(old_dir);
else
@@ -553,7 +550,7 @@ static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
drop_nlink(new_inode);
if (is_dir)
drop_nlink(new_inode);
- new_inode->i_ctime = ts;
+ fat_truncate_time(new_inode, &ts, S_CTIME);
}
out:
brelse(sinfo.bh);
@@ -597,13 +594,18 @@ error_inode:
}
/***** Rename, a wrapper for rename_same_dir & rename_diff_dir */
-static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry)
+static int msdos_rename(struct mnt_idmap *idmap,
+ struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry,
+ unsigned int flags)
{
struct super_block *sb = old_dir->i_sb;
unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME];
int err, is_hid;
+ if (flags & ~RENAME_NOREPLACE)
+ return -EINVAL;
+
mutex_lock(&MSDOS_SB(sb)->s_lock);
err = msdos_format_name(old_dentry->d_name.name,
@@ -638,33 +640,58 @@ static const struct inode_operations msdos_dir_inode_operations = {
.rename = msdos_rename,
.setattr = fat_setattr,
.getattr = fat_getattr,
+ .update_time = fat_update_time,
};
static void setup(struct super_block *sb)
{
MSDOS_SB(sb)->dir_ops = &msdos_dir_inode_operations;
- sb->s_d_op = &msdos_dentry_operations;
- sb->s_flags |= MS_NOATIME;
+ set_default_d_op(sb, &msdos_dentry_operations);
+ sb->s_flags |= SB_NOATIME;
}
-static int msdos_fill_super(struct super_block *sb, void *data, int silent)
+static int msdos_fill_super(struct super_block *sb, struct fs_context *fc)
{
- return fat_fill_super(sb, data, silent, 0, setup);
+ return fat_fill_super(sb, fc, setup);
}
-static struct dentry *msdos_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name,
- void *data)
+static int msdos_get_tree(struct fs_context *fc)
{
- return mount_bdev(fs_type, flags, dev_name, data, msdos_fill_super);
+ return get_tree_bdev(fc, msdos_fill_super);
+}
+
+static int msdos_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+ return fat_parse_param(fc, param, false);
+}
+
+static const struct fs_context_operations msdos_context_ops = {
+ .parse_param = msdos_parse_param,
+ .get_tree = msdos_get_tree,
+ .reconfigure = fat_reconfigure,
+ .free = fat_free_fc,
+};
+
+static int msdos_init_fs_context(struct fs_context *fc)
+{
+ int err;
+
+ /* Initialize with is_vfat == false */
+ err = fat_init_fs_context(fc, false);
+ if (err)
+ return err;
+
+ fc->ops = &msdos_context_ops;
+ return 0;
}
static struct file_system_type msdos_fs_type = {
.owner = THIS_MODULE,
.name = "msdos",
- .mount = msdos_mount,
.kill_sb = kill_block_super,
- .fs_flags = FS_REQUIRES_DEV,
+ .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
+ .init_fs_context = msdos_init_fs_context,
+ .parameters = fat_param_spec,
};
MODULE_ALIAS_FS("msdos");
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index 6df8d3d885e5..5dbc4cbb8fce 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/fs/vfat/namei.c
*
@@ -16,13 +17,24 @@
*/
#include <linux/module.h>
-#include <linux/jiffies.h>
#include <linux/ctype.h>
#include <linux/slab.h>
-#include <linux/buffer_head.h>
#include <linux/namei.h>
+#include <linux/kernel.h>
+#include <linux/iversion.h>
#include "fat.h"
+static inline unsigned long vfat_d_version(struct dentry *dentry)
+{
+ return (unsigned long) dentry->d_fsdata;
+}
+
+static inline void vfat_d_version_set(struct dentry *dentry,
+ unsigned long version)
+{
+ dentry->d_fsdata = (void *) version;
+}
+
/*
* If new entry was created in the parent, it could create the 8.3
* alias (the shortname of logname). So, the parent may have the
@@ -31,28 +43,25 @@
* If it happened, the negative dentry isn't actually negative
* anymore. So, drop it.
*/
-static int vfat_revalidate_shortname(struct dentry *dentry)
+static bool vfat_revalidate_shortname(struct dentry *dentry, struct inode *dir)
{
- int ret = 1;
- spin_lock(&dentry->d_lock);
- if (dentry->d_time != dentry->d_parent->d_inode->i_version)
- ret = 0;
- spin_unlock(&dentry->d_lock);
- return ret;
+ return inode_eq_iversion(dir, vfat_d_version(dentry));
}
-static int vfat_revalidate(struct dentry *dentry, unsigned int flags)
+static int vfat_revalidate(struct inode *dir, const struct qstr *name,
+ struct dentry *dentry, unsigned int flags)
{
if (flags & LOOKUP_RCU)
return -ECHILD;
/* This is not negative dentry. Always valid. */
- if (dentry->d_inode)
+ if (d_really_is_positive(dentry))
return 1;
- return vfat_revalidate_shortname(dentry);
+ return vfat_revalidate_shortname(dentry, dir);
}
-static int vfat_revalidate_ci(struct dentry *dentry, unsigned int flags)
+static int vfat_revalidate_ci(struct inode *dir, const struct qstr *name,
+ struct dentry *dentry, unsigned int flags)
{
if (flags & LOOKUP_RCU)
return -ECHILD;
@@ -67,7 +76,7 @@ static int vfat_revalidate_ci(struct dentry *dentry, unsigned int flags)
* positive dentry isn't good idea. So it's unsupported like
* rename("filename", "FILENAME") for now.
*/
- if (dentry->d_inode)
+ if (d_really_is_positive(dentry))
return 1;
/*
@@ -85,7 +94,7 @@ static int vfat_revalidate_ci(struct dentry *dentry, unsigned int flags)
if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
return 0;
- return vfat_revalidate_shortname(dentry);
+ return vfat_revalidate_shortname(dentry, dir);
}
/* returns the length of a struct qstr, ignoring trailing dots */
@@ -109,7 +118,7 @@ static unsigned int vfat_striptail_len(const struct qstr *qstr)
*/
static int vfat_hash(const struct dentry *dentry, struct qstr *qstr)
{
- qstr->hash = full_name_hash(qstr->name, vfat_striptail_len(qstr));
+ qstr->hash = full_name_hash(dentry, qstr->name, vfat_striptail_len(qstr));
return 0;
}
@@ -129,7 +138,7 @@ static int vfat_hashi(const struct dentry *dentry, struct qstr *qstr)
name = qstr->name;
len = vfat_striptail_len(qstr);
- hash = init_name_hash();
+ hash = init_name_hash(dentry);
while (len--)
hash = partial_name_hash(nls_tolower(t, *name++), hash);
qstr->hash = end_name_hash(hash);
@@ -140,10 +149,10 @@ static int vfat_hashi(const struct dentry *dentry, struct qstr *qstr)
/*
* Case insensitive compare of two vfat names.
*/
-static int vfat_cmpi(const struct dentry *parent, const struct dentry *dentry,
+static int vfat_cmpi(const struct dentry *dentry,
unsigned int len, const char *str, const struct qstr *name)
{
- struct nls_table *t = MSDOS_SB(parent->d_sb)->nls_io;
+ struct nls_table *t = MSDOS_SB(dentry->d_sb)->nls_io;
unsigned int alen, blen;
/* A filename cannot end in '.' or we treat it like it has none */
@@ -159,7 +168,7 @@ static int vfat_cmpi(const struct dentry *parent, const struct dentry *dentry,
/*
* Case sensitive compare of two vfat names.
*/
-static int vfat_cmp(const struct dentry *parent, const struct dentry *dentry,
+static int vfat_cmp(const struct dentry *dentry,
unsigned int len, const char *str, const struct qstr *name)
{
unsigned int alen, blen;
@@ -188,7 +197,7 @@ static const struct dentry_operations vfat_dentry_ops = {
/* Characters that are undesirable in an MS-DOS file name */
-static inline wchar_t vfat_bad_char(wchar_t w)
+static inline bool vfat_bad_char(wchar_t w)
{
return (w < 0x0020)
|| (w == '*') || (w == '?') || (w == '<') || (w == '>')
@@ -196,7 +205,7 @@ static inline wchar_t vfat_bad_char(wchar_t w)
|| (w == '\\');
}
-static inline wchar_t vfat_replace_char(wchar_t w)
+static inline bool vfat_replace_char(wchar_t w)
{
return (w == '[') || (w == ']') || (w == ';') || (w == ',')
|| (w == '+') || (w == '=');
@@ -501,10 +510,8 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
struct nls_table *nls)
{
const unsigned char *ip;
- unsigned char nc;
unsigned char *op;
- unsigned int ec;
- int i, k, fill;
+ int i, fill;
int charlen;
if (utf8) {
@@ -521,33 +528,22 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
i < len && *outlen < FAT_LFN_LEN;
*outlen += 1) {
if (escape && (*ip == ':')) {
+ u8 uc[2];
+
if (i > len - 5)
return -EINVAL;
- ec = 0;
- for (k = 1; k < 5; k++) {
- nc = ip[k];
- ec <<= 4;
- if (nc >= '0' && nc <= '9') {
- ec |= nc - '0';
- continue;
- }
- if (nc >= 'a' && nc <= 'f') {
- ec |= nc - ('a' - 10);
- continue;
- }
- if (nc >= 'A' && nc <= 'F') {
- ec |= nc - ('A' - 10);
- continue;
- }
+
+ if (hex2bin(uc, ip + 1, 2) < 0)
return -EINVAL;
- }
- *op++ = ec & 0xFF;
- *op++ = ec >> 8;
+
+ *(wchar_t *)op = uc[0] << 8 | uc[1];
+
+ op += 2;
ip += 5;
i += 5;
} else {
charlen = nls->char2uni(ip, len - i,
- (wchar_t *)op);
+ (wchar_t *)op);
if (charlen < 0)
return -EINVAL;
ip += charlen;
@@ -579,7 +575,7 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
static int vfat_build_slots(struct inode *dir, const unsigned char *name,
int len, int is_dir, int cluster,
- struct timespec *ts,
+ struct timespec64 *ts,
struct msdos_dir_slot *slots, int *nr_slots)
{
struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
@@ -654,8 +650,8 @@ out_free:
return err;
}
-static int vfat_add_entry(struct inode *dir, struct qstr *qname, int is_dir,
- int cluster, struct timespec *ts,
+static int vfat_add_entry(struct inode *dir, const struct qstr *qname,
+ int is_dir, int cluster, struct timespec64 *ts,
struct fat_slot_info *sinfo)
{
struct msdos_dir_slot *slots;
@@ -666,7 +662,7 @@ static int vfat_add_entry(struct inode *dir, struct qstr *qname, int is_dir,
if (len == 0)
return -ENOENT;
- slots = kmalloc(sizeof(*slots) * MSDOS_SLOTS, GFP_NOFS);
+ slots = kmalloc_array(MSDOS_SLOTS, sizeof(*slots), GFP_NOFS);
if (slots == NULL)
return -ENOMEM;
@@ -680,7 +676,7 @@ static int vfat_add_entry(struct inode *dir, struct qstr *qname, int is_dir,
goto cleanup;
/* update timestamp */
- dir->i_ctime = dir->i_mtime = dir->i_atime = *ts;
+ fat_truncate_time(dir, ts, S_CTIME|S_MTIME);
if (IS_DIRSYNC(dir))
(void)fat_sync_inode(dir);
else
@@ -690,7 +686,7 @@ cleanup:
return err;
}
-static int vfat_find(struct inode *dir, struct qstr *qname,
+static int vfat_find(struct inode *dir, const struct qstr *qname,
struct fat_slot_info *sinfo)
{
unsigned int len = vfat_striptail_len(qname);
@@ -699,15 +695,6 @@ static int vfat_find(struct inode *dir, struct qstr *qname,
return fat_search_long(dir, qname->name, len, sinfo);
}
-/*
- * (nfsd's) anonymous disconnected dentry?
- * NOTE: !IS_ROOT() is not anonymous (I.e. d_splice_alias() did the job).
- */
-static int vfat_d_anon_disconn(struct dentry *dentry)
-{
- return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
-}
-
static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
@@ -736,7 +723,11 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
}
alias = d_find_alias(inode);
- if (alias && !vfat_d_anon_disconn(alias)) {
+ /*
+ * Checking "alias->d_parent == dentry->d_parent" to make sure
+ * FS is not corrupted (especially double linked dir).
+ */
+ if (alias && alias->d_parent == dentry->d_parent) {
/*
* This inode has non anonymous-DCACHE_DISCONNECTED
* dentry. This means, the user did ->lookup() by an
@@ -744,7 +735,6 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
*
* Switch to new one for reason of locality if possible.
*/
- BUG_ON(d_unhashed(alias));
if (!S_ISDIR(inode->i_mode))
d_move(alias, dentry);
iput(inode);
@@ -755,33 +745,30 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
out:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
- dentry->d_time = dentry->d_parent->d_inode->i_version;
- dentry = d_splice_alias(inode, dentry);
- if (dentry)
- dentry->d_time = dentry->d_parent->d_inode->i_version;
- return dentry;
-
+ if (!inode)
+ vfat_d_version_set(dentry, inode_query_iversion(dir));
+ return d_splice_alias(inode, dentry);
error:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
return ERR_PTR(err);
}
-static int vfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
- bool excl)
+static int vfat_create(struct mnt_idmap *idmap, struct inode *dir,
+ struct dentry *dentry, umode_t mode, bool excl)
{
struct super_block *sb = dir->i_sb;
struct inode *inode;
struct fat_slot_info sinfo;
- struct timespec ts;
+ struct timespec64 ts;
int err;
mutex_lock(&MSDOS_SB(sb)->s_lock);
- ts = CURRENT_TIME_SEC;
+ ts = current_time(dir);
err = vfat_add_entry(dir, &dentry->d_name, 0, 0, &ts, &sinfo);
if (err)
goto out;
- dir->i_version++;
+ inode_inc_iversion(dir);
inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
brelse(sinfo.bh);
@@ -789,11 +776,8 @@ static int vfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
err = PTR_ERR(inode);
goto out;
}
- inode->i_version++;
- inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
- /* timestamp is already written, so mark_inode_dirty() is unneeded. */
+ inode_inc_iversion(inode);
- dentry->d_time = dentry->d_parent->d_inode->i_version;
d_instantiate(dentry, inode);
out:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
@@ -802,7 +786,7 @@ out:
static int vfat_rmdir(struct inode *dir, struct dentry *dentry)
{
- struct inode *inode = dentry->d_inode;
+ struct inode *inode = d_inode(dentry);
struct super_block *sb = dir->i_sb;
struct fat_slot_info sinfo;
int err;
@@ -822,8 +806,9 @@ static int vfat_rmdir(struct inode *dir, struct dentry *dentry)
drop_nlink(dir);
clear_nlink(inode);
- inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
+ fat_truncate_time(inode, NULL, S_ATIME|S_MTIME);
fat_detach(inode);
+ vfat_d_version_set(dentry, inode_query_iversion(dir));
out:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
@@ -832,7 +817,7 @@ out:
static int vfat_unlink(struct inode *dir, struct dentry *dentry)
{
- struct inode *inode = dentry->d_inode;
+ struct inode *inode = d_inode(dentry);
struct super_block *sb = dir->i_sb;
struct fat_slot_info sinfo;
int err;
@@ -847,25 +832,27 @@ static int vfat_unlink(struct inode *dir, struct dentry *dentry)
if (err)
goto out;
clear_nlink(inode);
- inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
+ fat_truncate_time(inode, NULL, S_ATIME|S_MTIME);
fat_detach(inode);
+ vfat_d_version_set(dentry, inode_query_iversion(dir));
out:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
return err;
}
-static int vfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+static struct dentry *vfat_mkdir(struct mnt_idmap *idmap, struct inode *dir,
+ struct dentry *dentry, umode_t mode)
{
struct super_block *sb = dir->i_sb;
struct inode *inode;
struct fat_slot_info sinfo;
- struct timespec ts;
+ struct timespec64 ts;
int err, cluster;
mutex_lock(&MSDOS_SB(sb)->s_lock);
- ts = CURRENT_TIME_SEC;
+ ts = current_time(dir);
cluster = fat_alloc_new_dir(dir, &ts);
if (cluster < 0) {
err = cluster;
@@ -874,7 +861,7 @@ static int vfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
err = vfat_add_entry(dir, &dentry->d_name, 1, cluster, &ts, &sinfo);
if (err)
goto out_free;
- dir->i_version++;
+ inode_inc_iversion(dir);
inc_nlink(dir);
inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
@@ -884,54 +871,88 @@ static int vfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
/* the directory was completed, just return a error */
goto out;
}
- inode->i_version++;
+ inode_inc_iversion(inode);
set_nlink(inode, 2);
- inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
- /* timestamp is already written, so mark_inode_dirty() is unneeded. */
- dentry->d_time = dentry->d_parent->d_inode->i_version;
d_instantiate(dentry, inode);
mutex_unlock(&MSDOS_SB(sb)->s_lock);
- return 0;
+ return NULL;
out_free:
fat_free_clusters(dir, cluster);
out:
mutex_unlock(&MSDOS_SB(sb)->s_lock);
- return err;
+ return ERR_PTR(err);
+}
+
+static int vfat_get_dotdot_de(struct inode *inode, struct buffer_head **bh,
+ struct msdos_dir_entry **de)
+{
+ if (S_ISDIR(inode->i_mode)) {
+ if (fat_get_dotdot_entry(inode, bh, de))
+ return -EIO;
+ }
+ return 0;
+}
+
+static int vfat_sync_ipos(struct inode *dir, struct inode *inode)
+{
+ if (IS_DIRSYNC(dir))
+ return fat_sync_inode(inode);
+ mark_inode_dirty(inode);
+ return 0;
+}
+
+static int vfat_update_dotdot_de(struct inode *dir, struct inode *inode,
+ struct buffer_head *dotdot_bh,
+ struct msdos_dir_entry *dotdot_de)
+{
+ fat_set_start(dotdot_de, MSDOS_I(dir)->i_logstart);
+ mark_buffer_dirty_inode(dotdot_bh, inode);
+ if (IS_DIRSYNC(dir))
+ return sync_dirty_buffer(dotdot_bh);
+ return 0;
+}
+
+static void vfat_update_dir_metadata(struct inode *dir, struct timespec64 *ts)
+{
+ inode_inc_iversion(dir);
+ fat_truncate_time(dir, ts, S_CTIME | S_MTIME);
+ if (IS_DIRSYNC(dir))
+ (void)fat_sync_inode(dir);
+ else
+ mark_inode_dirty(dir);
}
static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
struct buffer_head *dotdot_bh;
- struct msdos_dir_entry *dotdot_de;
+ struct msdos_dir_entry *dotdot_de = NULL;
struct inode *old_inode, *new_inode;
struct fat_slot_info old_sinfo, sinfo;
- struct timespec ts;
+ struct timespec64 ts;
loff_t new_i_pos;
- int err, is_dir, update_dotdot, corrupt = 0;
+ int err, is_dir, corrupt = 0;
struct super_block *sb = old_dir->i_sb;
old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
- old_inode = old_dentry->d_inode;
- new_inode = new_dentry->d_inode;
+ old_inode = d_inode(old_dentry);
+ new_inode = d_inode(new_dentry);
mutex_lock(&MSDOS_SB(sb)->s_lock);
err = vfat_find(old_dir, &old_dentry->d_name, &old_sinfo);
if (err)
goto out;
- is_dir = S_ISDIR(old_inode->i_mode);
- update_dotdot = (is_dir && old_dir != new_dir);
- if (update_dotdot) {
- if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de)) {
- err = -EIO;
+ if (old_dir != new_dir) {
+ err = vfat_get_dotdot_de(old_inode, &dotdot_bh, &dotdot_de);
+ if (err)
goto out;
- }
}
- ts = CURRENT_TIME_SEC;
+ is_dir = S_ISDIR(old_inode->i_mode);
+ ts = current_time(old_dir);
if (new_inode) {
if (is_dir) {
err = fat_dir_empty(new_inode);
@@ -947,25 +968,19 @@ static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
goto out;
new_i_pos = sinfo.i_pos;
}
- new_dir->i_version++;
+ inode_inc_iversion(new_dir);
fat_detach(old_inode);
fat_attach(old_inode, new_i_pos);
- if (IS_DIRSYNC(new_dir)) {
- err = fat_sync_inode(old_inode);
- if (err)
- goto error_inode;
- } else
- mark_inode_dirty(old_inode);
+ err = vfat_sync_ipos(new_dir, old_inode);
+ if (err)
+ goto error_inode;
- if (update_dotdot) {
- fat_set_start(dotdot_de, MSDOS_I(new_dir)->i_logstart);
- mark_buffer_dirty_inode(dotdot_bh, old_inode);
- if (IS_DIRSYNC(new_dir)) {
- err = sync_dirty_buffer(dotdot_bh);
- if (err)
- goto error_dotdot;
- }
+ if (dotdot_de) {
+ err = vfat_update_dotdot_de(new_dir, old_inode, dotdot_bh,
+ dotdot_de);
+ if (err)
+ goto error_dotdot;
drop_nlink(old_dir);
if (!new_inode)
inc_nlink(new_dir);
@@ -975,18 +990,13 @@ static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
old_sinfo.bh = NULL;
if (err)
goto error_dotdot;
- old_dir->i_version++;
- old_dir->i_ctime = old_dir->i_mtime = ts;
- if (IS_DIRSYNC(old_dir))
- (void)fat_sync_inode(old_dir);
- else
- mark_inode_dirty(old_dir);
+ vfat_update_dir_metadata(old_dir, &ts);
if (new_inode) {
drop_nlink(new_inode);
if (is_dir)
drop_nlink(new_inode);
- new_inode->i_ctime = ts;
+ fat_truncate_time(new_inode, &ts, S_CTIME);
}
out:
brelse(sinfo.bh);
@@ -1000,10 +1010,9 @@ error_dotdot:
/* data cluster is shared, serious corruption */
corrupt = 1;
- if (update_dotdot) {
- fat_set_start(dotdot_de, MSDOS_I(old_dir)->i_logstart);
- mark_buffer_dirty_inode(dotdot_bh, old_inode);
- corrupt |= sync_dirty_buffer(dotdot_bh);
+ if (dotdot_de) {
+ corrupt |= vfat_update_dotdot_de(old_dir, old_inode, dotdot_bh,
+ dotdot_de);
}
error_inode:
fat_detach(old_inode);
@@ -1025,49 +1034,206 @@ error_inode:
if (corrupt < 0) {
fat_fs_error(new_dir->i_sb,
"%s: Filesystem corrupted (i_pos %lld)",
- __func__, sinfo.i_pos);
+ __func__, new_i_pos);
}
goto out;
}
+static void vfat_exchange_ipos(struct inode *old_inode, struct inode *new_inode,
+ loff_t old_i_pos, loff_t new_i_pos)
+{
+ fat_detach(old_inode);
+ fat_detach(new_inode);
+ fat_attach(old_inode, new_i_pos);
+ fat_attach(new_inode, old_i_pos);
+}
+
+static void vfat_move_nlink(struct inode *src, struct inode *dst)
+{
+ drop_nlink(src);
+ inc_nlink(dst);
+}
+
+static int vfat_rename_exchange(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry)
+{
+ struct buffer_head *old_dotdot_bh = NULL, *new_dotdot_bh = NULL;
+ struct msdos_dir_entry *old_dotdot_de = NULL, *new_dotdot_de = NULL;
+ struct inode *old_inode, *new_inode;
+ struct timespec64 ts = current_time(old_dir);
+ loff_t old_i_pos, new_i_pos;
+ int err, corrupt = 0;
+ struct super_block *sb = old_dir->i_sb;
+
+ old_inode = d_inode(old_dentry);
+ new_inode = d_inode(new_dentry);
+
+ /* Acquire super block lock for the operation to be atomic */
+ mutex_lock(&MSDOS_SB(sb)->s_lock);
+
+ /* if directories are not the same, get ".." info to update */
+ if (old_dir != new_dir) {
+ err = vfat_get_dotdot_de(old_inode, &old_dotdot_bh,
+ &old_dotdot_de);
+ if (err)
+ goto out;
+
+ err = vfat_get_dotdot_de(new_inode, &new_dotdot_bh,
+ &new_dotdot_de);
+ if (err)
+ goto out;
+ }
+
+ old_i_pos = MSDOS_I(old_inode)->i_pos;
+ new_i_pos = MSDOS_I(new_inode)->i_pos;
+
+ vfat_exchange_ipos(old_inode, new_inode, old_i_pos, new_i_pos);
+
+ err = vfat_sync_ipos(old_dir, new_inode);
+ if (err)
+ goto error_exchange;
+ err = vfat_sync_ipos(new_dir, old_inode);
+ if (err)
+ goto error_exchange;
+
+ /* update ".." directory entry info */
+ if (old_dotdot_de) {
+ err = vfat_update_dotdot_de(new_dir, old_inode, old_dotdot_bh,
+ old_dotdot_de);
+ if (err)
+ goto error_old_dotdot;
+ }
+ if (new_dotdot_de) {
+ err = vfat_update_dotdot_de(old_dir, new_inode, new_dotdot_bh,
+ new_dotdot_de);
+ if (err)
+ goto error_new_dotdot;
+ }
+
+ /* if cross directory and only one is a directory, adjust nlink */
+ if (!old_dotdot_de != !new_dotdot_de) {
+ if (old_dotdot_de)
+ vfat_move_nlink(old_dir, new_dir);
+ else
+ vfat_move_nlink(new_dir, old_dir);
+ }
+
+ vfat_update_dir_metadata(old_dir, &ts);
+ /* if directories are not the same, update new_dir as well */
+ if (old_dir != new_dir)
+ vfat_update_dir_metadata(new_dir, &ts);
+
+out:
+ brelse(old_dotdot_bh);
+ brelse(new_dotdot_bh);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
+
+ return err;
+
+error_new_dotdot:
+ if (new_dotdot_de) {
+ corrupt |= vfat_update_dotdot_de(new_dir, new_inode,
+ new_dotdot_bh, new_dotdot_de);
+ }
+
+error_old_dotdot:
+ if (old_dotdot_de) {
+ corrupt |= vfat_update_dotdot_de(old_dir, old_inode,
+ old_dotdot_bh, old_dotdot_de);
+ }
+
+error_exchange:
+ vfat_exchange_ipos(old_inode, new_inode, new_i_pos, old_i_pos);
+ corrupt |= vfat_sync_ipos(new_dir, new_inode);
+ corrupt |= vfat_sync_ipos(old_dir, old_inode);
+
+ if (corrupt < 0) {
+ fat_fs_error(new_dir->i_sb,
+ "%s: Filesystem corrupted (i_pos %lld, %lld)",
+ __func__, old_i_pos, new_i_pos);
+ }
+ goto out;
+}
+
+static int vfat_rename2(struct mnt_idmap *idmap, struct inode *old_dir,
+ struct dentry *old_dentry, struct inode *new_dir,
+ struct dentry *new_dentry, unsigned int flags)
+{
+ if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
+ return -EINVAL;
+
+ if (flags & RENAME_EXCHANGE) {
+ return vfat_rename_exchange(old_dir, old_dentry,
+ new_dir, new_dentry);
+ }
+
+ /* VFS already handled RENAME_NOREPLACE, handle it as a normal rename */
+ return vfat_rename(old_dir, old_dentry, new_dir, new_dentry);
+}
+
static const struct inode_operations vfat_dir_inode_operations = {
.create = vfat_create,
.lookup = vfat_lookup,
.unlink = vfat_unlink,
.mkdir = vfat_mkdir,
.rmdir = vfat_rmdir,
- .rename = vfat_rename,
+ .rename = vfat_rename2,
.setattr = fat_setattr,
.getattr = fat_getattr,
+ .update_time = fat_update_time,
};
static void setup(struct super_block *sb)
{
MSDOS_SB(sb)->dir_ops = &vfat_dir_inode_operations;
if (MSDOS_SB(sb)->options.name_check != 's')
- sb->s_d_op = &vfat_ci_dentry_ops;
+ set_default_d_op(sb, &vfat_ci_dentry_ops);
else
- sb->s_d_op = &vfat_dentry_ops;
+ set_default_d_op(sb, &vfat_dentry_ops);
+}
+
+static int vfat_fill_super(struct super_block *sb, struct fs_context *fc)
+{
+ return fat_fill_super(sb, fc, setup);
}
-static int vfat_fill_super(struct super_block *sb, void *data, int silent)
+static int vfat_get_tree(struct fs_context *fc)
{
- return fat_fill_super(sb, data, silent, 1, setup);
+ return get_tree_bdev(fc, vfat_fill_super);
}
-static struct dentry *vfat_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name,
- void *data)
+static int vfat_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
- return mount_bdev(fs_type, flags, dev_name, data, vfat_fill_super);
+ return fat_parse_param(fc, param, true);
+}
+
+static const struct fs_context_operations vfat_context_ops = {
+ .parse_param = vfat_parse_param,
+ .get_tree = vfat_get_tree,
+ .reconfigure = fat_reconfigure,
+ .free = fat_free_fc,
+};
+
+static int vfat_init_fs_context(struct fs_context *fc)
+{
+ int err;
+
+ /* Initialize with is_vfat == true */
+ err = fat_init_fs_context(fc, true);
+ if (err)
+ return err;
+
+ fc->ops = &vfat_context_ops;
+ return 0;
}
static struct file_system_type vfat_fs_type = {
.owner = THIS_MODULE,
.name = "vfat",
- .mount = vfat_mount,
.kill_sb = kill_block_super,
- .fs_flags = FS_REQUIRES_DEV,
+ .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
+ .init_fs_context = vfat_init_fs_context,
+ .parameters = fat_param_spec,
};
MODULE_ALIAS_FS("vfat");
diff --git a/fs/fat/nfs.c b/fs/fat/nfs.c
index 93e14933dcb6..509eea96a457 100644
--- a/fs/fat/nfs.c
+++ b/fs/fat/nfs.c
@@ -1,14 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
/* fs/fat/nfs.c
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
*/
#include <linux/exportfs.h>
@@ -26,7 +17,7 @@ struct fat_fid {
#define FAT_FID_SIZE_WITHOUT_PARENT 3
#define FAT_FID_SIZE_WITH_PARENT (sizeof(struct fat_fid)/sizeof(u32))
-/**
+/*
* Look up a directory inode given its starting cluster.
*/
static struct inode *fat_dget(struct super_block *sb, int i_logstart)
@@ -139,12 +130,18 @@ fat_encode_fh_nostale(struct inode *inode, __u32 *fh, int *lenp,
fid->parent_i_gen = parent->i_generation;
type = FILEID_FAT_WITH_PARENT;
*lenp = FAT_FID_SIZE_WITH_PARENT;
+ } else {
+ /*
+ * We need to initialize this field because the fh is actually
+ * 12 bytes long
+ */
+ fid->parent_i_pos_hi = 0;
}
return type;
}
-/**
+/*
* Map a NFS file handle to a corresponding dentry.
* The dentry may or may not be connected to the filesystem root.
*/
@@ -266,7 +263,7 @@ struct inode *fat_rebuild_parent(struct super_block *sb, int parent_logstart)
* Find the parent for a directory that is not currently connected to
* the filesystem root.
*
- * On entry, the caller holds child_dir->d_inode->i_mutex.
+ * On entry, the caller holds d_inode(child_dir)->i_mutex.
*/
static struct dentry *fat_get_parent(struct dentry *child_dir)
{
@@ -276,7 +273,7 @@ static struct dentry *fat_get_parent(struct dentry *child_dir)
struct inode *parent_inode = NULL;
struct msdos_sb_info *sbi = MSDOS_SB(sb);
- if (!fat_get_dotdot_entry(child_dir->d_inode, &bh, &de)) {
+ if (!fat_get_dotdot_entry(d_inode(child_dir), &bh, &de)) {
int parent_logstart = fat_get_start(sbi, de);
parent_inode = fat_dget(sb, parent_logstart);
if (!parent_inode && sbi->options.nfs == FAT_NFS_NOSTALE_RO)
@@ -288,6 +285,7 @@ static struct dentry *fat_get_parent(struct dentry *child_dir)
}
const struct export_operations fat_export_ops = {
+ .encode_fh = generic_encode_ino32_fh,
.fh_to_dentry = fat_fh_to_dentry,
.fh_to_parent = fat_fh_to_parent,
.get_parent = fat_get_parent,
generated by cgit (git 2.34.1) at 2025-12-25 12:20:52 +0000