lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

fs: dcache scale dentry refcount

Browse Source 
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>
This commit is contained in:
Nick Piggin
2011-01-07 17:49:32 +11:00
parent 2304450783
commit b7ab39f631
21 changed files with 126 additions and 69 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
fs/autofs4/root.c
View File

@@ -436,7 +436,7 @@ static struct dentry *autofs4_lookup_active(struct dentry *dentry)
spin_lock(&active->d_lock);
/* Already gone? */
if (atomic_read(&active->d_count) == 0)
if (active->d_count == 0)
goto next;
qstr = &active->d_name;
@@ -452,7 +452,7 @@ static struct dentry *autofs4_lookup_active(struct dentry *dentry)
goto next;
if (d_unhashed(active)) {
dget(active);
dget_dlock(active);
spin_unlock(&active->d_lock);
spin_unlock(&sbi->lookup_lock);
spin_unlock(&dcache_lock);
@@ -507,7 +507,7 @@ static struct dentry *autofs4_lookup_expiring(struct dentry *dentry)
goto next;
if (d_unhashed(expiring)) {
dget(expiring);
dget_dlock(expiring);
spin_unlock(&expiring->d_lock);
spin_unlock(&sbi->lookup_lock);
spin_unlock(&dcache_lock);