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authorAl Viro <viro@zeniv.linux.org.uk>2014-05-03 00:02:25 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2014-05-03 16:45:06 -0400
commitfe91522a7ba82ca1a51b07e19954b3825e4aaa22 (patch)
treec0676a69fe25019e6aaa2f676740e495ec8c1b1d /fs/dcache.c
parent41edf278fc2f042f4e22a12ed87d19c5201210e1 (diff)
downloadlwn-fe91522a7ba82ca1a51b07e19954b3825e4aaa22.tar.gz
lwn-fe91522a7ba82ca1a51b07e19954b3825e4aaa22.zip
don't remove from shrink list in select_collect()
If we find something already on a shrink list, just increment data->found and do nothing else. Loops in shrink_dcache_parent() and check_submounts_and_drop() will do the right thing - everything we did put into our list will be evicted and if there had been nothing, but data->found got non-zero, well, we have somebody else shrinking those guys; just try again. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/dcache.c')
-rw-r--r--fs/dcache.c31
1 files changed, 10 insertions, 21 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index 58e26bee7ef4..f39a6f5a1220 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1229,34 +1229,23 @@ static enum d_walk_ret select_collect(void *_data, struct dentry *dentry)
if (data->start == dentry)
goto out;
- /*
- * move only zero ref count dentries to the dispose list.
- *
- * Those which are presently on the shrink list, being processed
- * by shrink_dentry_list(), shouldn't be moved. Otherwise the
- * loop in shrink_dcache_parent() might not make any progress
- * and loop forever.
- */
- if (dentry->d_lockref.count) {
- dentry_lru_del(dentry);
- } else if (!(dentry->d_flags & DCACHE_SHRINK_LIST)) {
- /*
- * We can't use d_lru_shrink_move() because we
- * need to get the global LRU lock and do the
- * LRU accounting.
- */
- d_lru_del(dentry);
- d_shrink_add(dentry, &data->dispose);
+ if (dentry->d_flags & DCACHE_SHRINK_LIST) {
data->found++;
- ret = D_WALK_NORETRY;
+ } else {
+ if (dentry->d_flags & DCACHE_LRU_LIST)
+ d_lru_del(dentry);
+ if (!dentry->d_lockref.count) {
+ d_shrink_add(dentry, &data->dispose);
+ data->found++;
+ }
}
/*
* We can return to the caller if we have found some (this
* ensures forward progress). We'll be coming back to find
* the rest.
*/
- if (data->found && need_resched())
- ret = D_WALK_QUIT;
+ if (!list_empty(&data->dispose))
+ ret = need_resched() ? D_WALK_QUIT : D_WALK_NORETRY;
out:
return ret;
}