xiaomi-sm8450/android_kernel_xiaomi_sm8450
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fs: dcache scale dentry refcount

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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
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8
fs/autofs4/expire.c
View File

@@ -198,7 +198,7 @@ static int autofs4_tree_busy(struct vfsmount *mnt,
else
ino_count++;
if (atomic_read(&p->d_count) > ino_count) {
if (p->d_count > ino_count) {
top_ino->last_used = jiffies;
dput(p);
return 1;
@@ -347,7 +347,7 @@ struct dentry *autofs4_expire_indirect(struct super_block *sb,
/* Path walk currently on this dentry? */
ino_count = atomic_read(&ino->count) + 2;
if (atomic_read(&dentry->d_count) > ino_count)
if (dentry->d_count > ino_count)
goto next;
/* Can we umount this guy */
@@ -369,7 +369,7 @@ struct dentry *autofs4_expire_indirect(struct super_block *sb,
if (!exp_leaves) {
/* Path walk currently on this dentry? */
ino_count = atomic_read(&ino->count) + 1;
if (atomic_read(&dentry->d_count) > ino_count)
if (dentry->d_count > ino_count)
goto next;
if (!autofs4_tree_busy(mnt, dentry, timeout, do_now)) {
@@ -383,7 +383,7 @@ struct dentry *autofs4_expire_indirect(struct super_block *sb,
} else {
/* Path walk currently on this dentry? */
ino_count = atomic_read(&ino->count) + 1;
if (atomic_read(&dentry->d_count) > ino_count)
if (dentry->d_count > ino_count)
goto next;
expired = autofs4_check_leaves(mnt, dentry, timeout, do_now);

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);