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authorNick Piggin <npiggin@kernel.dk>2011-01-07 17:49:35 +1100
committerNick Piggin <npiggin@kernel.dk>2011-01-07 17:50:22 +1100
commitb23fb0a60379a95e10c671f646b259ea2558421e (patch)
tree7c3644b91241d32fda502a7be0b78e4c225f8091 /fs/exportfs
parent2fd6b7f50797f2e993eea59e0a0b8c6399c811dc (diff)
fs: scale inode alias list
Add a new lock, dcache_inode_lock, to protect the inode's i_dentry list from concurrent modification. d_alias is also protected by d_lock. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'fs/exportfs')
-rw-r--r--fs/exportfs/expfs.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 51b304056f10..84b8c460a781 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -48,8 +48,10 @@ find_acceptable_alias(struct dentry *result,
return result;
spin_lock(&dcache_lock);
+ spin_lock(&dcache_inode_lock);
list_for_each_entry(dentry, &result->d_inode->i_dentry, d_alias) {
dget_locked(dentry);
+ spin_unlock(&dcache_inode_lock);
spin_unlock(&dcache_lock);
if (toput)
dput(toput);
@@ -58,8 +60,10 @@ find_acceptable_alias(struct dentry *result,
return dentry;
}
spin_lock(&dcache_lock);
+ spin_lock(&dcache_inode_lock);
toput = dentry;
}
+ spin_unlock(&dcache_inode_lock);
spin_unlock(&dcache_lock);
if (toput)