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authorNick Piggin <npiggin@kernel.dk>2011-01-07 17:50:06 +1100
committerNick Piggin <npiggin@kernel.dk>2011-01-07 17:50:31 +1100
commit873feea09ebc980cbd3631b767356ce1eee65ec1 (patch)
tree59a8fce9b138086abee7cf845f62ff70a390cf81 /fs/exportfs
parentceb5bdc2d246f6d81cf61ed70f325308a11821d2 (diff)
downloadlinux-stericsson-873feea09ebc980cbd3631b767356ce1eee65ec1.tar.gz
fs: dcache per-inode inode alias locking
dcache_inode_lock can be replaced with per-inode locking. Use existing inode->i_lock for this. This is slightly non-trivial because we sometimes need to find the inode from the dentry, which requires d_inode to be stabilised (either with refcount or d_lock). Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'fs/exportfs')
-rw-r--r--fs/exportfs/expfs.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index f06a940065f6..4b6825740dd5 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -43,24 +43,26 @@ find_acceptable_alias(struct dentry *result,
void *context)
{
struct dentry *dentry, *toput = NULL;
+ struct inode *inode;
if (acceptable(context, result))
return result;
- spin_lock(&dcache_inode_lock);
- list_for_each_entry(dentry, &result->d_inode->i_dentry, d_alias) {
+ inode = result->d_inode;
+ spin_lock(&inode->i_lock);
+ list_for_each_entry(dentry, &inode->i_dentry, d_alias) {
dget(dentry);
- spin_unlock(&dcache_inode_lock);
+ spin_unlock(&inode->i_lock);
if (toput)
dput(toput);
if (dentry != result && acceptable(context, dentry)) {
dput(result);
return dentry;
}
- spin_lock(&dcache_inode_lock);
+ spin_lock(&inode->i_lock);
toput = dentry;
}
- spin_unlock(&dcache_inode_lock);
+ spin_unlock(&inode->i_lock);
if (toput)
dput(toput);