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-rw-r--r--fs/hostfs/hostfs.h36
-rw-r--r--fs/hostfs/hostfs_kern.c154
-rw-r--r--fs/hostfs/hostfs_user.c59
3 files changed, 115 insertions, 134 deletions
diff --git a/fs/hostfs/hostfs.h b/fs/hostfs/hostfs.h
index 8b39c15c408c..aa02599b770f 100644
--- a/fs/hostfs/hostfs.h
+++ b/fs/hostfs/hostfs.h
@@ -3,40 +3,8 @@
#define __UM_FS_HOSTFS
#include <os.h>
+#include <generated/asm-offsets.h>
-/*
- * These are exactly the same definitions as in fs.h, but the names are
- * changed so that this file can be included in both kernel and user files.
- */
-
-#define HOSTFS_ATTR_MODE 1
-#define HOSTFS_ATTR_UID 2
-#define HOSTFS_ATTR_GID 4
-#define HOSTFS_ATTR_SIZE 8
-#define HOSTFS_ATTR_ATIME 16
-#define HOSTFS_ATTR_MTIME 32
-#define HOSTFS_ATTR_CTIME 64
-#define HOSTFS_ATTR_ATIME_SET 128
-#define HOSTFS_ATTR_MTIME_SET 256
-
-/* This one is unused by hostfs. */
-#define HOSTFS_ATTR_FORCE 512 /* Not a change, but a change it */
-#define HOSTFS_ATTR_ATTR_FLAG 1024
-
-/*
- * If you are very careful, you'll notice that these two are missing:
- *
- * #define ATTR_KILL_SUID 2048
- * #define ATTR_KILL_SGID 4096
- *
- * and this is because they were added in 2.5 development.
- * Actually, they are not needed by most ->setattr() methods - they are set by
- * callers of notify_change() to notify that the setuid/setgid bits must be
- * dropped.
- * notify_change() will delete those flags, make sure attr->ia_valid & ATTR_MODE
- * is on, and remove the appropriate bits from attr->ia_mode (attr is a
- * "struct iattr *"). -BlaisorBlade
- */
struct hostfs_timespec {
long long tv_sec;
long long tv_nsec;
@@ -60,7 +28,7 @@ struct hostfs_stat {
unsigned int uid;
unsigned int gid;
unsigned long long size;
- struct hostfs_timespec atime, mtime, ctime;
+ struct hostfs_timespec atime, mtime, ctime, btime;
unsigned int blksize;
unsigned long long blocks;
struct {
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 6d1cf2436ead..51d26aa2b93e 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -33,6 +33,7 @@ struct hostfs_inode_info {
struct inode vfs_inode;
struct mutex open_mutex;
dev_t dev;
+ struct hostfs_timespec btime;
};
static inline struct hostfs_inode_info *HOSTFS_I(struct inode *inode)
@@ -57,6 +58,7 @@ static int __init hostfs_args(char *options, int *add)
{
char *ptr;
+ *add = 0;
ptr = strchr(options, ',');
if (ptr != NULL)
*ptr++ = '\0';
@@ -94,32 +96,17 @@ __uml_setup("hostfs=", hostfs_args,
static char *__dentry_name(struct dentry *dentry, char *name)
{
char *p = dentry_path_raw(dentry, name, PATH_MAX);
- char *root;
- size_t len;
- struct hostfs_fs_info *fsi;
-
- fsi = dentry->d_sb->s_fs_info;
- root = fsi->host_root_path;
- len = strlen(root);
- if (IS_ERR(p)) {
- __putname(name);
- return NULL;
- }
-
- /*
- * This function relies on the fact that dentry_path_raw() will place
- * the path name at the end of the provided buffer.
- */
- BUG_ON(p + strlen(p) + 1 != name + PATH_MAX);
+ struct hostfs_fs_info *fsi = dentry->d_sb->s_fs_info;
+ char *root = fsi->host_root_path;
+ size_t len = strlen(root);
- strscpy(name, root, PATH_MAX);
- if (len > p - name) {
+ if (IS_ERR(p) || len > p - name) {
__putname(name);
return NULL;
}
- if (p > name + len)
- strcpy(name + len, p);
+ memcpy(name, root, len);
+ memmove(name + len, p, name + PATH_MAX - p);
return name;
}
@@ -274,7 +261,7 @@ static int hostfs_show_options(struct seq_file *seq, struct dentry *root)
static const struct super_operations hostfs_sbops = {
.alloc_inode = hostfs_alloc_inode,
.free_inode = hostfs_free_inode,
- .drop_inode = generic_delete_inode,
+ .drop_inode = inode_just_drop,
.evict_inode = hostfs_evict_inode,
.statfs = hostfs_statfs,
.show_options = hostfs_show_options,
@@ -395,7 +382,7 @@ static const struct file_operations hostfs_file_fops = {
.splice_write = iter_file_splice_write,
.read_iter = generic_file_read_iter,
.write_iter = generic_file_write_iter,
- .mmap = generic_file_mmap,
+ .mmap_prepare = generic_file_mmap_prepare,
.open = hostfs_open,
.release = hostfs_file_release,
.fsync = hostfs_fsync,
@@ -409,38 +396,33 @@ static const struct file_operations hostfs_dir_fops = {
.fsync = hostfs_fsync,
};
-static int hostfs_writepage(struct page *page, struct writeback_control *wbc)
+static int hostfs_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
{
- struct address_space *mapping = page->mapping;
struct inode *inode = mapping->host;
- char *buffer;
- loff_t base = page_offset(page);
- int count = PAGE_SIZE;
- int end_index = inode->i_size >> PAGE_SHIFT;
- int err;
-
- if (page->index >= end_index)
- count = inode->i_size & (PAGE_SIZE-1);
-
- buffer = kmap_local_page(page);
-
- err = write_file(HOSTFS_I(inode)->fd, &base, buffer, count);
- if (err != count) {
- if (err >= 0)
- err = -EIO;
- mapping_set_error(mapping, err);
- goto out;
+ struct folio *folio = NULL;
+ loff_t i_size = i_size_read(inode);
+ int err = 0;
+
+ while ((folio = writeback_iter(mapping, wbc, folio, &err))) {
+ loff_t pos = folio_pos(folio);
+ size_t count = folio_size(folio);
+ char *buffer;
+ int ret;
+
+ if (count > i_size - pos)
+ count = i_size - pos;
+
+ buffer = kmap_local_folio(folio, 0);
+ ret = write_file(HOSTFS_I(inode)->fd, &pos, buffer, count);
+ kunmap_local(buffer);
+ folio_unlock(folio);
+ if (ret != count) {
+ err = ret < 0 ? ret : -EIO;
+ mapping_set_error(mapping, err);
+ }
}
- if (base > inode->i_size)
- inode->i_size = base;
-
- err = 0;
-
- out:
- kunmap_local(buffer);
- unlock_page(page);
-
return err;
}
@@ -463,7 +445,8 @@ static int hostfs_read_folio(struct file *file, struct folio *folio)
return ret;
}
-static int hostfs_write_begin(struct file *file, struct address_space *mapping,
+static int hostfs_write_begin(const struct kiocb *iocb,
+ struct address_space *mapping,
loff_t pos, unsigned len,
struct folio **foliop, void **fsdata)
{
@@ -471,12 +454,13 @@ static int hostfs_write_begin(struct file *file, struct address_space *mapping,
*foliop = __filemap_get_folio(mapping, index, FGP_WRITEBEGIN,
mapping_gfp_mask(mapping));
- if (!*foliop)
- return -ENOMEM;
+ if (IS_ERR(*foliop))
+ return PTR_ERR(*foliop);
return 0;
}
-static int hostfs_write_end(struct file *file, struct address_space *mapping,
+static int hostfs_write_end(const struct kiocb *iocb,
+ struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct folio *folio, void *fsdata)
{
@@ -486,7 +470,7 @@ static int hostfs_write_end(struct file *file, struct address_space *mapping,
int err;
buffer = kmap_local_folio(folio, from);
- err = write_file(FILE_HOSTFS_I(file)->fd, &pos, buffer, copied);
+ err = write_file(FILE_HOSTFS_I(iocb->ki_filp)->fd, &pos, buffer, copied);
kunmap_local(buffer);
if (!folio_test_uptodate(folio) && err == folio_size(folio))
@@ -505,11 +489,12 @@ static int hostfs_write_end(struct file *file, struct address_space *mapping,
}
static const struct address_space_operations hostfs_aops = {
- .writepage = hostfs_writepage,
+ .writepages = hostfs_writepages,
.read_folio = hostfs_read_folio,
.dirty_folio = filemap_dirty_folio,
.write_begin = hostfs_write_begin,
.write_end = hostfs_write_end,
+ .migrate_folio = filemap_migrate_folio,
};
static int hostfs_inode_update(struct inode *ino, const struct hostfs_stat *st)
@@ -565,6 +550,7 @@ static int hostfs_inode_set(struct inode *ino, void *data)
}
HOSTFS_I(ino)->dev = dev;
+ HOSTFS_I(ino)->btime = st->btime;
ino->i_ino = st->ino;
ino->i_mode = st->mode;
return hostfs_inode_update(ino, st);
@@ -575,7 +561,10 @@ static int hostfs_inode_test(struct inode *inode, void *data)
const struct hostfs_stat *st = data;
dev_t dev = MKDEV(st->dev.maj, st->dev.min);
- return inode->i_ino == st->ino && HOSTFS_I(inode)->dev == dev;
+ return inode->i_ino == st->ino && HOSTFS_I(inode)->dev == dev &&
+ (inode->i_mode & S_IFMT) == (st->mode & S_IFMT) &&
+ HOSTFS_I(inode)->btime.tv_sec == st->btime.tv_sec &&
+ HOSTFS_I(inode)->btime.tv_nsec == st->btime.tv_nsec;
}
static struct inode *hostfs_iget(struct super_block *sb, char *name)
@@ -592,7 +581,7 @@ static struct inode *hostfs_iget(struct super_block *sb, char *name)
if (!inode)
return ERR_PTR(-ENOMEM);
- if (inode->i_state & I_NEW) {
+ if (inode_state_read_once(inode) & I_NEW) {
unlock_new_inode(inode);
} else {
spin_lock(&inode->i_lock);
@@ -697,17 +686,25 @@ static int hostfs_symlink(struct mnt_idmap *idmap, struct inode *ino,
return err;
}
-static int hostfs_mkdir(struct mnt_idmap *idmap, struct inode *ino,
- struct dentry *dentry, umode_t mode)
+static struct dentry *hostfs_mkdir(struct mnt_idmap *idmap, struct inode *ino,
+ struct dentry *dentry, umode_t mode)
{
+ struct inode *inode;
char *file;
int err;
if ((file = dentry_name(dentry)) == NULL)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
err = do_mkdir(file, mode);
+ if (err) {
+ dentry = ERR_PTR(err);
+ } else {
+ inode = hostfs_iget(dentry->d_sb, file);
+ d_drop(dentry);
+ dentry = d_splice_alias(inode, dentry);
+ }
__putname(file);
- return err;
+ return dentry;
}
static int hostfs_rmdir(struct inode *ino, struct dentry *dentry)
@@ -938,7 +935,7 @@ static int hostfs_fill_super(struct super_block *sb, struct fs_context *fc)
sb->s_blocksize_bits = 10;
sb->s_magic = HOSTFS_SUPER_MAGIC;
sb->s_op = &hostfs_sbops;
- sb->s_d_op = &simple_dentry_operations;
+ sb->s_d_flags = DCACHE_DONTCACHE;
sb->s_maxbytes = MAX_LFS_FILESIZE;
err = super_setup_bdi(sb);
if (err)
@@ -982,7 +979,7 @@ static int hostfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
struct hostfs_fs_info *fsi = fc->s_fs_info;
struct fs_parse_result result;
- char *host_root;
+ char *host_root, *tmp_root;
int opt;
opt = fs_parse(fc, hostfs_param_specs, param, &result);
@@ -993,11 +990,13 @@ static int hostfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
case Opt_hostfs:
host_root = param->string;
if (!*host_root)
- host_root = "";
- fsi->host_root_path =
- kasprintf(GFP_KERNEL, "%s/%s", root_ino, host_root);
- if (fsi->host_root_path == NULL)
+ break;
+ tmp_root = kasprintf(GFP_KERNEL, "%s%s",
+ fsi->host_root_path, host_root);
+ if (!tmp_root)
return -ENOMEM;
+ kfree(fsi->host_root_path);
+ fsi->host_root_path = tmp_root;
break;
}
@@ -1007,17 +1006,17 @@ static int hostfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
static int hostfs_parse_monolithic(struct fs_context *fc, void *data)
{
struct hostfs_fs_info *fsi = fc->s_fs_info;
- char *host_root = (char *)data;
+ char *tmp_root, *host_root = (char *)data;
/* NULL is printed as '(null)' by printf(): avoid that. */
if (host_root == NULL)
- host_root = "";
+ return 0;
- fsi->host_root_path =
- kasprintf(GFP_KERNEL, "%s/%s", root_ino, host_root);
- if (fsi->host_root_path == NULL)
+ tmp_root = kasprintf(GFP_KERNEL, "%s%s", fsi->host_root_path, host_root);
+ if (!tmp_root)
return -ENOMEM;
-
+ kfree(fsi->host_root_path);
+ fsi->host_root_path = tmp_root;
return 0;
}
@@ -1052,6 +1051,11 @@ static int hostfs_init_fs_context(struct fs_context *fc)
if (!fsi)
return -ENOMEM;
+ fsi->host_root_path = kasprintf(GFP_KERNEL, "%s/", root_ino);
+ if (!fsi->host_root_path) {
+ kfree(fsi);
+ return -ENOMEM;
+ }
fc->s_fs_info = fsi;
fc->ops = &hostfs_context_ops;
return 0;
diff --git a/fs/hostfs/hostfs_user.c b/fs/hostfs/hostfs_user.c
index 97e9c40a9448..3bcd9f35e70b 100644
--- a/fs/hostfs/hostfs_user.c
+++ b/fs/hostfs/hostfs_user.c
@@ -18,39 +18,48 @@
#include "hostfs.h"
#include <utime.h>
-static void stat64_to_hostfs(const struct stat64 *buf, struct hostfs_stat *p)
+static void statx_to_hostfs(const struct statx *buf, struct hostfs_stat *p)
{
- p->ino = buf->st_ino;
- p->mode = buf->st_mode;
- p->nlink = buf->st_nlink;
- p->uid = buf->st_uid;
- p->gid = buf->st_gid;
- p->size = buf->st_size;
- p->atime.tv_sec = buf->st_atime;
- p->atime.tv_nsec = 0;
- p->ctime.tv_sec = buf->st_ctime;
- p->ctime.tv_nsec = 0;
- p->mtime.tv_sec = buf->st_mtime;
- p->mtime.tv_nsec = 0;
- p->blksize = buf->st_blksize;
- p->blocks = buf->st_blocks;
- p->rdev.maj = os_major(buf->st_rdev);
- p->rdev.min = os_minor(buf->st_rdev);
- p->dev.maj = os_major(buf->st_dev);
- p->dev.min = os_minor(buf->st_dev);
+ p->ino = buf->stx_ino;
+ p->mode = buf->stx_mode;
+ p->nlink = buf->stx_nlink;
+ p->uid = buf->stx_uid;
+ p->gid = buf->stx_gid;
+ p->size = buf->stx_size;
+ p->atime.tv_sec = buf->stx_atime.tv_sec;
+ p->atime.tv_nsec = buf->stx_atime.tv_nsec;
+ p->ctime.tv_sec = buf->stx_ctime.tv_sec;
+ p->ctime.tv_nsec = buf->stx_ctime.tv_nsec;
+ p->mtime.tv_sec = buf->stx_mtime.tv_sec;
+ p->mtime.tv_nsec = buf->stx_mtime.tv_nsec;
+ if (buf->stx_mask & STATX_BTIME) {
+ p->btime.tv_sec = buf->stx_btime.tv_sec;
+ p->btime.tv_nsec = buf->stx_btime.tv_nsec;
+ } else {
+ memset(&p->btime, 0, sizeof(p->btime));
+ }
+ p->blksize = buf->stx_blksize;
+ p->blocks = buf->stx_blocks;
+ p->rdev.maj = buf->stx_rdev_major;
+ p->rdev.min = buf->stx_rdev_minor;
+ p->dev.maj = buf->stx_dev_major;
+ p->dev.min = buf->stx_dev_minor;
}
int stat_file(const char *path, struct hostfs_stat *p, int fd)
{
- struct stat64 buf;
+ struct statx buf;
+ int flags = AT_SYMLINK_NOFOLLOW;
if (fd >= 0) {
- if (fstat64(fd, &buf) < 0)
- return -errno;
- } else if (lstat64(path, &buf) < 0) {
- return -errno;
+ flags |= AT_EMPTY_PATH;
+ path = "";
}
- stat64_to_hostfs(&buf, p);
+
+ if ((statx(fd, path, flags, STATX_BASIC_STATS | STATX_BTIME, &buf)) < 0)
+ return -errno;
+
+ statx_to_hostfs(&buf, p);
return 0;
}
generated by cgit (git 2.34.1) at 2025-12-24 17:14:50 +0000