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inotify: convert to idr_alloc()

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Convert to the much saner new idr interface.

Note that the adhoc cyclic id allocation is buggy.  If wraparound
happens, the previous code with idr_get_new_above() may segfault and
the converted code will trigger WARN and return -EINVAL.  Even if it's
fixed to wrap to zero, the code will be prone to unnecessary -ENOSPC
failures after the first wraparound.  We probably need to implement
proper cyclic support in idr.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: John McCutchan <john@johnmccutchan.com>
Cc: Robert Love <rlove@rlove.org>
Cc: Eric Paris <eparis@parisplace.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tejun Heo 2013-02-27 17:04:50 -08:00 committed by Linus Torvalds
parent 2a86b3e74f
commit 4542da631a
1 changed files with 11 additions and 13 deletions
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18
fs/notify/inotify/inotify_user.c
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@ -364,22 +364,20 @@ static int inotify_add_to_idr(struct idr *idr, spinlock_t *idr_lock,
{
int ret;
do {
if (unlikely(!idr_pre_get(idr, GFP_KERNEL)))
return -ENOMEM;
idr_preload(GFP_KERNEL);
spin_lock(idr_lock);
ret = idr_get_new_above(idr, i_mark, *last_wd + 1,
&i_mark->wd);
ret = idr_alloc(idr, i_mark, *last_wd + 1, 0, GFP_NOWAIT);
if (ret >= 0) {
/* we added the mark to the idr, take a reference */
if (!ret) {
i_mark->wd = ret;
*last_wd = i_mark->wd;
fsnotify_get_mark(&i_mark->fsn_mark);
}
spin_unlock(idr_lock);
} while (ret == -EAGAIN);
return ret;
spin_unlock(idr_lock);
idr_preload_end();
return ret < 0 ? ret : 0;
}
static struct inotify_inode_mark *inotify_idr_find_locked(struct fsnotify_group *group,