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ovl_lookup_real_one(): don't bother with strlen()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2019-04-26 13:07:27 -04:00
parent 1d8b29fdb7
commit 230c6402b1
7 changed files with 13 additions and 15 deletions
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14
fs/dcache.c
View file

@ -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) void take_dentry_name_snapshot(struct name_snapshot *name, struct dentry *dentry)
{ {
spin_lock(&dentry->d_lock); spin_lock(&dentry->d_lock);
name->name = dentry->d_name;
if (unlikely(dname_external(dentry))) { if (unlikely(dname_external(dentry))) {
struct external_name *p = external_name(dentry); atomic_inc(&external_name(dentry)->u.count);
atomic_inc(&p->u.count);
spin_unlock(&dentry->d_lock);
name->name = p->name;
} else { } else {
memcpy(name->inline_name, dentry->d_iname, memcpy(name->inline_name, dentry->d_iname,
dentry->d_name.len + 1); dentry->d_name.len + 1);
spin_unlock(&dentry->d_lock); name->name.name = name->inline_name;
name->name = name->inline_name;
} }
spin_unlock(&dentry->d_lock);
} }
EXPORT_SYMBOL(take_dentry_name_snapshot); EXPORT_SYMBOL(take_dentry_name_snapshot);
void release_dentry_name_snapshot(struct name_snapshot *name) 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; 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))) if (unlikely(atomic_dec_and_test(&p->u.count)))
kfree_rcu(p, u.head); kfree_rcu(p, u.head);
} }

2
fs/debugfs/inode.c
View file

@ -819,7 +819,7 @@ struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
goto exit; goto exit;
} }
d_move(old_dentry, dentry); 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.name,
d_is_dir(old_dentry), d_is_dir(old_dentry),
NULL, old_dentry); NULL, old_dentry);
release_dentry_name_snapshot(&old_name); release_dentry_name_snapshot(&old_name);

2
fs/namei.c
View file

@ -4498,7 +4498,7 @@ out:
inode_unlock(target); inode_unlock(target);
dput(new_dentry); dput(new_dentry);
if (!error) { if (!error) {
fsnotify_move(old_dir, new_dir, old_name.name, is_dir, fsnotify_move(old_dir, new_dir, old_name.name.name, is_dir,
!(flags & RENAME_EXCHANGE) ? target : NULL, old_dentry); !(flags & RENAME_EXCHANGE) ? target : NULL, old_dentry);
if (flags & RENAME_EXCHANGE) { 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.name,

4
fs/notify/fsnotify.c
View file

@ -179,10 +179,10 @@ int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask
take_dentry_name_snapshot(&name, dentry); take_dentry_name_snapshot(&name, dentry);
if (path) if (path)
ret = fsnotify(p_inode, mask, path, FSNOTIFY_EVENT_PATH, ret = fsnotify(p_inode, mask, path, FSNOTIFY_EVENT_PATH,
name.name, 0); name.name.name, 0);
else else
ret = fsnotify(p_inode, mask, dentry->d_inode, FSNOTIFY_EVENT_INODE, ret = fsnotify(p_inode, mask, dentry->d_inode, FSNOTIFY_EVENT_INODE,
name.name, 0); name.name.name, 0);
release_dentry_name_snapshot(&name); release_dentry_name_snapshot(&name);
} }

2
fs/overlayfs/export.c
View file

@ -398,7 +398,7 @@ static struct dentry *ovl_lookup_real_one(struct dentry *connected,
* pointer because we hold no lock on the real dentry. * pointer because we hold no lock on the real dentry.
*/ */
take_dentry_name_snapshot(&name, real); 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); err = PTR_ERR(this);
if (IS_ERR(this)) { if (IS_ERR(this)) {
goto fail; goto fail;

2
include/linux/dcache.h
View file

@ -593,7 +593,7 @@ static inline struct inode *d_real_inode(const struct dentry *dentry)
} }
struct name_snapshot { struct name_snapshot {
const unsigned char *name; struct qstr name;
unsigned char inline_name[DNAME_INLINE_LEN]; unsigned char inline_name[DNAME_INLINE_LEN];
}; };
void take_dentry_name_snapshot(struct name_snapshot *, struct dentry *); void take_dentry_name_snapshot(struct name_snapshot *, struct dentry *);

2
include/linux/fsnotify.h
View file

@ -178,7 +178,7 @@ static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
take_dentry_name_snapshot(&name, dentry); take_dentry_name_snapshot(&name, dentry);
fsnotify(d_inode(parent), mask, d_inode(dentry), FSNOTIFY_EVENT_INODE, fsnotify(d_inode(parent), mask, d_inode(dentry), FSNOTIFY_EVENT_INODE,
name.name, 0); name.name.name, 0);
release_dentry_name_snapshot(&name); release_dentry_name_snapshot(&name);
dput(parent); dput(parent);