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fs/dcache: Fix indefinite wait in d_invalidate()

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In the path of task exit, the proc dentries corresponding to this
task will be killed by moving it to a shrink list. If those dentries
are already claimed by another task for shrinking, the exiting
task waits in a tight loop until those dentries are killed. This can
potentially result in a deadlock if those dentries are corresponding
to an RT task but the task which is shrinking those dentries is a
lower priority task. Fix this by not doing tight loop, if our dentries
are claimed by other task.

Change-Id: If6848521469db7dea2bbba0dbaf8597094716267
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
This commit is contained in:
Sahitya Tummala 2017-04-21 21:56:19 +05:30
parent 6ee87610ac
commit cd6afb3e4b
1 changed files with 1 additions and 1 deletions
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2
fs/dcache.c
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@ -1364,7 +1364,7 @@ static enum d_walk_ret select_collect(void *_data, struct dentry *dentry)
goto out;
if (dentry->d_flags & DCACHE_SHRINK_LIST) {
data->found++;
goto out;
} else {
if (dentry->d_flags & DCACHE_LRU_LIST)
d_lru_del(dentry);