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authorNick Piggin <npiggin@kernel.dk>2011-01-07 17:49:32 +1100
committerNick Piggin <npiggin@kernel.dk>2011-01-07 17:50:21 +1100
commitb7ab39f631f505edc2bbdb86620d5493f995c9da (patch)
tree62be97ebc7fc69ceb601f23312d335ebb8038ee7 /fs/nfs
parent2304450783dfde7b0b94ae234edd0dbffa865073 (diff)
fs: dcache scale dentry refcount
Make d_count non-atomic and protect it with d_lock. This allows us to ensure a 0 refcount dentry remains 0 without dcache_lock. It is also fairly natural when we start protecting many other dentry members with d_lock. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/dir.c6
-rw-r--r--fs/nfs/unlink.c2
2 files changed, 4 insertions, 4 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 9184c7c80f7..12de824edb5 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1720,7 +1720,7 @@ static int nfs_unlink(struct inode *dir, struct dentry *dentry)
spin_lock(&dcache_lock);
spin_lock(&dentry->d_lock);
- if (atomic_read(&dentry->d_count) > 1) {
+ if (dentry->d_count > 1) {
spin_unlock(&dentry->d_lock);
spin_unlock(&dcache_lock);
/* Start asynchronous writeout of the inode */
@@ -1868,7 +1868,7 @@ static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n",
old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
new_dentry->d_parent->d_name.name, new_dentry->d_name.name,
- atomic_read(&new_dentry->d_count));
+ new_dentry->d_count);
/*
* For non-directories, check whether the target is busy and if so,
@@ -1886,7 +1886,7 @@ static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
rehash = new_dentry;
}
- if (atomic_read(&new_dentry->d_count) > 2) {
+ if (new_dentry->d_count > 2) {
int err;
/* copy the target dentry's name */
diff --git a/fs/nfs/unlink.c b/fs/nfs/unlink.c
index 7bdec853140..8fe9eb47a97 100644
--- a/fs/nfs/unlink.c
+++ b/fs/nfs/unlink.c
@@ -496,7 +496,7 @@ nfs_sillyrename(struct inode *dir, struct dentry *dentry)
dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
- atomic_read(&dentry->d_count));
+ dentry->d_count);
nfs_inc_stats(dir, NFSIOS_SILLYRENAME);
/*