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authorLinus Torvalds <torvalds@linux-foundation.org>2019-05-07 20:03:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-07 20:03:32 -0700
commitd27fb65bc2389621040e5107baedb94b4cccf641 (patch)
tree4123a7b82dd048dc8b0602994a5db6f4b9885998 /fs
parentd3511f53bb2475f2a4e8460bee5a1ae6dea2a433 (diff)
parent795d673af1afae8146ac3070a2d77cfae5287c43 (diff)
Merge branch 'work.dcache' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull misc dcache updates from Al Viro: "Most of this pile is putting name length into struct name_snapshot and making use of it. The beginning of this series ("ovl_lookup_real_one(): don't bother with strlen()") ought to have been split in two (separate switch of name_snapshot to struct qstr from overlayfs reaping the trivial benefits of that), but I wanted to avoid a rebase - by the time I'd spotted that it was (a) in -next and (b) close to 5.1-final ;-/" * 'work.dcache' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: audit_compare_dname_path(): switch to const struct qstr * audit_update_watch(): switch to const struct qstr * inotify_handle_event(): don't bother with strlen() fsnotify: switch send_to_group() and ->handle_event to const struct qstr * fsnotify(): switch to passing const struct qstr * for file_name switch fsnotify_move() to passing const struct qstr * for old_name ovl_lookup_real_one(): don't bother with strlen() sysv: bury the broken "quietly truncate the long filenames" logics nsfs: unobfuscate unexport d_alloc_pseudo()
Diffstat (limited to 'fs')
-rw-r--r--fs/dcache.c18
-rw-r--r--fs/debugfs/inode.c2
-rw-r--r--fs/internal.h1
-rw-r--r--fs/kernfs/file.c6
-rw-r--r--fs/namei.c4
-rw-r--r--fs/notify/dnotify/dnotify.c2
-rw-r--r--fs/notify/fanotify/fanotify.c2
-rw-r--r--fs/notify/fsnotify.c8
-rw-r--r--fs/notify/inotify/inotify.h2
-rw-r--r--fs/notify/inotify/inotify_fsnotify.c6
-rw-r--r--fs/nsfs.c23
-rw-r--r--fs/overlayfs/export.c2
-rw-r--r--fs/sysv/namei.c15
-rw-r--r--fs/sysv/super.c3
-rw-r--r--fs/sysv/sysv.h3
15 files changed, 38 insertions, 59 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index c663c602f9ef..982d97bbb72c 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -284,25 +284,23 @@ static inline int dname_external(const struct dentry *dentry)
void take_dentry_name_snapshot(struct name_snapshot *name, struct dentry *dentry)
{
spin_lock(&dentry->d_lock);
+ name->name = dentry->d_name;
if (unlikely(dname_external(dentry))) {
- struct external_name *p = external_name(dentry);
- atomic_inc(&p->u.count);
- spin_unlock(&dentry->d_lock);
- name->name = p->name;
+ atomic_inc(&external_name(dentry)->u.count);
} else {
memcpy(name->inline_name, dentry->d_iname,
dentry->d_name.len + 1);
- spin_unlock(&dentry->d_lock);
- name->name = name->inline_name;
+ name->name.name = name->inline_name;
}
+ spin_unlock(&dentry->d_lock);
}
EXPORT_SYMBOL(take_dentry_name_snapshot);
void release_dentry_name_snapshot(struct name_snapshot *name)
{
- if (unlikely(name->name != name->inline_name)) {
+ if (unlikely(name->name.name != name->inline_name)) {
struct external_name *p;
- p = container_of(name->name, struct external_name, name[0]);
+ p = container_of(name->name.name, struct external_name, name[0]);
if (unlikely(atomic_dec_and_test(&p->u.count)))
kfree_rcu(p, u.head);
}
@@ -1742,6 +1740,9 @@ struct dentry *d_alloc_cursor(struct dentry * parent)
* never be anyone's children or parents. Unlike all other
* dentries, these will not have RCU delay between dropping the
* last reference and freeing them.
+ *
+ * The only user is alloc_file_pseudo() and that's what should
+ * be considered a public interface. Don't use directly.
*/
struct dentry *d_alloc_pseudo(struct super_block *sb, const struct qstr *name)
{
@@ -1750,7 +1751,6 @@ struct dentry *d_alloc_pseudo(struct super_block *sb, const struct qstr *name)
dentry->d_flags |= DCACHE_NORCU;
return dentry;
}
-EXPORT_SYMBOL(d_alloc_pseudo);
struct dentry *d_alloc_name(struct dentry *parent, const char *name)
{
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 414fa4752047..acef14ad53db 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -818,7 +818,7 @@ struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
goto exit;
}
d_move(old_dentry, dentry);
- fsnotify_move(d_inode(old_dir), d_inode(new_dir), old_name.name,
+ fsnotify_move(d_inode(old_dir), d_inode(new_dir), &old_name.name,
d_is_dir(old_dentry),
NULL, old_dentry);
release_dentry_name_snapshot(&old_name);
diff --git a/fs/internal.h b/fs/internal.h
index 82b78aec1ce9..17a8ae967493 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -155,6 +155,7 @@ extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
extern int d_set_mounted(struct dentry *dentry);
extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
extern struct dentry *d_alloc_cursor(struct dentry *);
+extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
/*
* read_write.c
diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index ae948aaa4c53..553ce0a92b05 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -885,6 +885,7 @@ repeat:
list_for_each_entry(info, &kernfs_root(kn)->supers, node) {
struct kernfs_node *parent;
struct inode *inode;
+ struct qstr name;
/*
* We want fsnotify_modify() on @kn but as the
@@ -896,6 +897,7 @@ repeat:
if (!inode)
continue;
+ name = (struct qstr)QSTR_INIT(kn->name, strlen(kn->name));
parent = kernfs_get_parent(kn);
if (parent) {
struct inode *p_inode;
@@ -903,7 +905,7 @@ repeat:
p_inode = ilookup(info->sb, parent->id.ino);
if (p_inode) {
fsnotify(p_inode, FS_MODIFY | FS_EVENT_ON_CHILD,
- inode, FSNOTIFY_EVENT_INODE, kn->name, 0);
+ inode, FSNOTIFY_EVENT_INODE, &name, 0);
iput(p_inode);
}
@@ -911,7 +913,7 @@ repeat:
}
fsnotify(inode, FS_MODIFY, inode, FSNOTIFY_EVENT_INODE,
- kn->name, 0);
+ &name, 0);
iput(inode);
}
diff --git a/fs/namei.c b/fs/namei.c
index dede0147b3f6..5ebd64b21970 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4498,10 +4498,10 @@ out:
inode_unlock(target);
dput(new_dentry);
if (!error) {
- fsnotify_move(old_dir, new_dir, old_name.name, is_dir,
+ fsnotify_move(old_dir, new_dir, &old_name.name, is_dir,
!(flags & RENAME_EXCHANGE) ? target : NULL, old_dentry);
if (flags & RENAME_EXCHANGE) {
- fsnotify_move(new_dir, old_dir, old_dentry->d_name.name,
+ fsnotify_move(new_dir, old_dir, &old_dentry->d_name,
new_is_dir, NULL, new_dentry);
}
}
diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
index 58d77dc696eb..250369d6901d 100644
--- a/fs/notify/dnotify/dnotify.c
+++ b/fs/notify/dnotify/dnotify.c
@@ -81,7 +81,7 @@ static void dnotify_recalc_inode_mask(struct fsnotify_mark *fsn_mark)
static int dnotify_handle_event(struct fsnotify_group *group,
struct inode *inode,
u32 mask, const void *data, int data_type,
- const unsigned char *file_name, u32 cookie,
+ const struct qstr *file_name, u32 cookie,
struct fsnotify_iter_info *iter_info)
{
struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index 63c6bb1f8c4d..e6fde1a5c072 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -367,7 +367,7 @@ static __kernel_fsid_t fanotify_get_fsid(struct fsnotify_iter_info *iter_info)
static int fanotify_handle_event(struct fsnotify_group *group,
struct inode *inode,
u32 mask, const void *data, int data_type,
- const unsigned char *file_name, u32 cookie,
+ const struct qstr *file_name, u32 cookie,
struct fsnotify_iter_info *iter_info)
{
int ret = 0;
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index df06f3da166c..5433e37fb0c5 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -179,10 +179,10 @@ int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask
take_dentry_name_snapshot(&name, dentry);
if (path)
ret = fsnotify(p_inode, mask, path, FSNOTIFY_EVENT_PATH,
- name.name, 0);
+ &name.name, 0);
else
ret = fsnotify(p_inode, mask, dentry->d_inode, FSNOTIFY_EVENT_INODE,
- name.name, 0);
+ &name.name, 0);
release_dentry_name_snapshot(&name);
}
@@ -195,7 +195,7 @@ EXPORT_SYMBOL_GPL(__fsnotify_parent);
static int send_to_group(struct inode *to_tell,
__u32 mask, const void *data,
int data_is, u32 cookie,
- const unsigned char *file_name,
+ const struct qstr *file_name,
struct fsnotify_iter_info *iter_info)
{
struct fsnotify_group *group = NULL;
@@ -325,7 +325,7 @@ static void fsnotify_iter_next(struct fsnotify_iter_info *iter_info)
* notification event in whatever means they feel necessary.
*/
int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
- const unsigned char *file_name, u32 cookie)
+ const struct qstr *file_name, u32 cookie)
{
struct fsnotify_iter_info iter_info = {};
struct super_block *sb = to_tell->i_sb;
diff --git a/fs/notify/inotify/inotify.h b/fs/notify/inotify/inotify.h
index 74ae60305189..3f246f7b8a92 100644
--- a/fs/notify/inotify/inotify.h
+++ b/fs/notify/inotify/inotify.h
@@ -27,7 +27,7 @@ extern void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark,
extern int inotify_handle_event(struct fsnotify_group *group,
struct inode *inode,
u32 mask, const void *data, int data_type,
- const unsigned char *file_name, u32 cookie,
+ const struct qstr *file_name, u32 cookie,
struct fsnotify_iter_info *iter_info);
extern const struct fsnotify_ops inotify_fsnotify_ops;
diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
index ff30abd6a49b..7e8b131029f8 100644
--- a/fs/notify/inotify/inotify_fsnotify.c
+++ b/fs/notify/inotify/inotify_fsnotify.c
@@ -67,7 +67,7 @@ static int inotify_merge(struct list_head *list,
int inotify_handle_event(struct fsnotify_group *group,
struct inode *inode,
u32 mask, const void *data, int data_type,
- const unsigned char *file_name, u32 cookie,
+ const struct qstr *file_name, u32 cookie,
struct fsnotify_iter_info *iter_info)
{
struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
@@ -89,7 +89,7 @@ int inotify_handle_event(struct fsnotify_group *group,
return 0;
}
if (file_name) {
- len = strlen(file_name);
+ len = file_name->len;
alloc_len += len + 1;
}
@@ -129,7 +129,7 @@ int inotify_handle_event(struct fsnotify_group *group,
event->sync_cookie = cookie;
event->name_len = len;
if (len)
- strcpy(event->name, file_name);
+ strcpy(event->name, file_name->name);
ret = fsnotify_add_event(group, fsn_event, inotify_merge);
if (ret) {
diff --git a/fs/nsfs.c b/fs/nsfs.c
index 30d150a4f0c6..e3bf08c5af41 100644
--- a/fs/nsfs.c
+++ b/fs/nsfs.c
@@ -105,17 +105,16 @@ slow:
void *ns_get_path_cb(struct path *path, ns_get_path_helper_t *ns_get_cb,
void *private_data)
{
- struct ns_common *ns;
void *ret;
-again:
- ns = ns_get_cb(private_data);
- if (!ns)
- return ERR_PTR(-ENOENT);
+ do {
+ struct ns_common *ns = ns_get_cb(private_data);
+ if (!ns)
+ return ERR_PTR(-ENOENT);
+
+ ret = __ns_get_path(path, ns);
+ } while (ret == ERR_PTR(-EAGAIN));
- ret = __ns_get_path(path, ns);
- if (IS_ERR(ret) && PTR_ERR(ret) == -EAGAIN)
- goto again;
return ret;
}
@@ -154,7 +153,7 @@ int open_related_ns(struct ns_common *ns,
if (fd < 0)
return fd;
- while (1) {
+ do {
struct ns_common *relative;
relative = get_ns(ns);
@@ -164,10 +163,8 @@ int open_related_ns(struct ns_common *ns,
}
err = __ns_get_path(&path, relative);
- if (IS_ERR(err) && PTR_ERR(err) == -EAGAIN)
- continue;
- break;
- }
+ } while (err == ERR_PTR(-EAGAIN));
+
if (IS_ERR(err)) {
put_unused_fd(fd);
return PTR_ERR(err);
diff --git a/fs/overlayfs/export.c b/fs/overlayfs/export.c
index 54e5d17d7f3e..cc1c9e5606ba 100644
--- a/fs/overlayfs/export.c
+++ b/fs/overlayfs/export.c
@@ -398,7 +398,7 @@ static struct dentry *ovl_lookup_real_one(struct dentry *connected,
* pointer because we hold no lock on the real dentry.
*/
take_dentry_name_snapshot(&name, real);
- this = lookup_one_len(name.name, connected, strlen(name.name));
+ this = lookup_one_len(name.name.name, connected, name.name.len);
err = PTR_ERR(this);
if (IS_ERR(this)) {
goto fail;
diff --git a/fs/sysv/namei.c b/fs/sysv/namei.c
index 4d5d20491ffd..ea2414b385ec 100644
--- a/fs/sysv/namei.c
+++ b/fs/sysv/namei.c
@@ -28,21 +28,6 @@ static int add_nondir(struct dentry *dentry, struct inode *inode)
return err;
}
-static int sysv_hash(const struct dentry *dentry, struct qstr *qstr)
-{
- /* Truncate the name in place, avoids having to define a compare
- function. */
- if (qstr->len > SYSV_NAMELEN) {
- qstr->len = SYSV_NAMELEN;
- qstr->hash = full_name_hash(dentry, qstr->name, qstr->len);
- }
- return 0;
-}
-
-const struct dentry_operations sysv_dentry_operations = {
- .d_hash = sysv_hash,
-};
-
static struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry, unsigned int flags)
{
struct inode * inode = NULL;
diff --git a/fs/sysv/super.c b/fs/sysv/super.c
index 89765ddfb738..d3b2f54d6449 100644
--- a/fs/sysv/super.c
+++ b/fs/sysv/super.c
@@ -312,7 +312,6 @@ static int complete_read_super(struct super_block *sb, int silent, int size)
flavour_setup[sbi->s_type](sbi, &sb->s_max_links);
- sbi->s_truncate = 1;
sbi->s_ndatazones = sbi->s_nzones - sbi->s_firstdatazone;
sbi->s_inodes_per_block = bsize >> 6;
sbi->s_inodes_per_block_1 = (bsize >> 6)-1;
@@ -334,8 +333,6 @@ static int complete_read_super(struct super_block *sb, int silent, int size)
sb->s_op = &sysv_sops;
if (sbi->s_forced_ro)
sb->s_flags |= SB_RDONLY;
- if (sbi->s_truncate)
- sb->s_d_op = &sysv_dentry_operations;
root_inode = sysv_iget(sb, SYSV_ROOT_INO);
if (IS_ERR(root_inode)) {
printk("SysV FS: get root inode failed\n");
diff --git a/fs/sysv/sysv.h b/fs/sysv/sysv.h
index e913698779c0..1cff585526b1 100644
--- a/fs/sysv/sysv.h
+++ b/fs/sysv/sysv.h
@@ -23,8 +23,6 @@ struct sysv_sb_info {
struct super_block *s_sb; /* VFS superblock */
int s_type; /* file system type: FSTYPE_{XENIX|SYSV|COH} */
char s_bytesex; /* bytesex (le/be/pdp) */
- char s_truncate; /* if 1: names > SYSV_NAMELEN chars are truncated */
- /* if 0: they are disallowed (ENAMETOOLONG) */
unsigned int s_inodes_per_block; /* number of inodes per block */
unsigned int s_inodes_per_block_1; /* inodes_per_block - 1 */
unsigned int s_inodes_per_block_bits; /* log2(inodes_per_block) */
@@ -166,7 +164,6 @@ extern const struct file_operations sysv_file_operations;
extern const struct file_operations sysv_dir_operations;
extern const struct address_space_operations sysv_aops;
extern const struct super_operations sysv_sops;
-extern const struct dentry_operations sysv_dentry_operations;
enum {