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authorNick Piggin <npiggin@kernel.dk>2011-01-07 01:49:32 -0500
committerNick Piggin <npiggin@kernel.dk>2011-01-07 01:50:21 -0500
commitb7ab39f631f505edc2bbdb86620d5493f995c9da (patch)
tree62be97ebc7fc69ceb601f23312d335ebb8038ee7 /fs/locks.c
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/locks.c')
-rw-r--r--fs/locks.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/locks.c b/fs/locks.c
index 8729347bcd1a..08415b2a6d36 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1389,7 +1389,7 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp)
1389 if ((arg == F_RDLCK) && (atomic_read(&inode->i_writecount) > 0)) 1389 if ((arg == F_RDLCK) && (atomic_read(&inode->i_writecount) > 0))
1390 goto out; 1390 goto out;
1391 if ((arg == F_WRLCK) 1391 if ((arg == F_WRLCK)
1392 && ((atomic_read(&dentry->d_count) > 1) 1392 && ((dentry->d_count > 1)
1393 || (atomic_read(&inode->i_count) > 1))) 1393 || (atomic_read(&inode->i_count) > 1)))
1394 goto out; 1394 goto out;
1395 } 1395 }