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fsnotify(): switch to passing const struct qstr * for file_name

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Note that in fnsotify_move() and fsnotify_link() we are guaranteed
that dentry->d_name won't change during the fsnotify() evaluation
(by having the parent directory locked exclusive), so we don't
need to fetch dentry->d_name.name in the callers.  In fsnotify_dirent()
the same stability of dentry->d_name is also true, but it's a bit
more convoluted - there is one callchain (devpts_pty_new() ->
fsnotify_create() -> fsnotify_dirent()) where the parent is _not_
locked, but on devpts ->d_name of everything is unchanging; it
has neither explicit nor implicit renames.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2019-04-26 13:37:25 -04:00
parent f4ec3a3d43
commit 25b229dff4
4 changed files with 15 additions and 13 deletions
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8
fs/notify/fsnotify.c
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@@ -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.name, 0);
&name.name, 0);
else
ret = fsnotify(p_inode, mask, dentry->d_inode, FSNOTIFY_EVENT_INODE,
name.name.name, 0);
&name.name, 0);
release_dentry_name_snapshot(&name);
}
@@ -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;
@@ -379,7 +379,7 @@ int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is,
*/
while (fsnotify_iter_select_report_types(&iter_info)) {
ret = send_to_group(to_tell, mask, data, data_is, cookie,
file_name, &iter_info);
file_name->name, &iter_info);
if (ret && (mask & ALL_FSNOTIFY_PERM_EVENTS))
goto out;