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authorNick Piggin <npiggin@kernel.dk>2011-01-07 01:49:27 -0500
committerNick Piggin <npiggin@kernel.dk>2011-01-07 01:50:19 -0500
commit621e155a3591962420eacdd39f6f0aa29ceb221e (patch)
tree387a9fb396f1bf24514b712c294182e36ba51076 /fs/dcache.c
parentfb2d5b86aff355a27ebfc132d3c99f4a940cc3fe (diff)
fs: change d_compare for rcu-walk
Change d_compare so it may be called from lock-free RCU lookups. This does put significant restrictions on what may be done from the callback, however there don't seem to have been any problems with in-tree fses. If some strange use case pops up that _really_ cannot cope with the rcu-walk rules, we can just add new rcu-unaware callbacks, which would cause name lookup to drop out of rcu-walk mode. For in-tree filesystems, this is just a mechanical change. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'fs/dcache.c')
-rw-r--r--fs/dcache.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index 814e5f491e9c..7075555fbb04 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1437,7 +1437,9 @@ struct dentry * __d_lookup(struct dentry * parent, struct qstr * name)
1437 */ 1437 */
1438 qstr = &dentry->d_name; 1438 qstr = &dentry->d_name;
1439 if (parent->d_op && parent->d_op->d_compare) { 1439 if (parent->d_op && parent->d_op->d_compare) {
1440 if (parent->d_op->d_compare(parent, qstr, name)) 1440 if (parent->d_op->d_compare(parent, parent->d_inode,
1441 dentry, dentry->d_inode,
1442 qstr->len, qstr->name, name))
1441 goto next; 1443 goto next;
1442 } else { 1444 } else {
1443 if (qstr->len != len) 1445 if (qstr->len != len)