diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2017-07-07 14:51:19 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-11 09:30:11 -0700 |
| commit | a1dbc0979b4f92f3b0d0bb86671639e09315f43c (patch) | |
| tree | 868e7b83c92834529ec9010d7fc34691ce63a332 /include | |
| parent | f31f0a166c5ee34204e2b9b1533b6d7435bb8621 (diff) | |
dentry name snapshots
commit 49d31c2f389acfe83417083e1208422b4091cd9e upstream.
take_dentry_name_snapshot() takes a safe snapshot of dentry name;
if the name is a short one, it gets copied into caller-supplied
structure, otherwise an extra reference to external name is grabbed
(those are never modified). In either case the pointer to stable
string is stored into the same structure.
dentry must be held by the caller of take_dentry_name_snapshot(),
but may be freely dropped afterwards - the snapshot will stay
until destroyed by release_dentry_name_snapshot().
Intended use:
struct name_snapshot s;
take_dentry_name_snapshot(&s, dentry);
...
access s.name
...
release_dentry_name_snapshot(&s);
Replaces fsnotify_oldname_...(), gets used in fsnotify to obtain the name
to pass down with event.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/dcache.h | 7 | ||||
| -rw-r--r-- | include/linux/fsnotify.h | 31 |
2 files changed, 7 insertions, 31 deletions
diff --git a/include/linux/dcache.h b/include/linux/dcache.h index 340ee0dae93b..493926ff1717 100644 --- a/include/linux/dcache.h +++ b/include/linux/dcache.h @@ -527,4 +527,11 @@ static inline struct dentry *d_backing_dentry(struct dentry *upper) return upper; } +struct name_snapshot { + const char *name; + char inline_name[DNAME_INLINE_LEN]; +}; +void take_dentry_name_snapshot(struct name_snapshot *, struct dentry *); +void release_dentry_name_snapshot(struct name_snapshot *); + #endif /* __LINUX_DCACHE_H */ diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h index 7ee1774edee5..a7789559078b 100644 --- a/include/linux/fsnotify.h +++ b/include/linux/fsnotify.h @@ -310,35 +310,4 @@ static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid) } } -#if defined(CONFIG_FSNOTIFY) /* notify helpers */ - -/* - * fsnotify_oldname_init - save off the old filename before we change it - */ -static inline const unsigned char *fsnotify_oldname_init(const unsigned char *name) -{ - return kstrdup(name, GFP_KERNEL); -} - -/* - * fsnotify_oldname_free - free the name we got from fsnotify_oldname_init - */ -static inline void fsnotify_oldname_free(const unsigned char *old_name) -{ - kfree(old_name); -} - -#else /* CONFIG_FSNOTIFY */ - -static inline const char *fsnotify_oldname_init(const unsigned char *name) -{ - return NULL; -} - -static inline void fsnotify_oldname_free(const unsigned char *old_name) -{ -} - -#endif /* CONFIG_FSNOTIFY */ - #endif /* _LINUX_FS_NOTIFY_H */ |