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Date: Wed, 3 Jul 2013 16:21:24 -0400
From: Waiman Long <Waiman.Long@...com>
To: Alexander Viro <viro@...iv.linux.org.uk>,
Jeff Layton <jlayton@...hat.com>,
Miklos Szeredi <mszeredi@...e.cz>,
Ingo Molnar <mingo@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>
Cc: Waiman Long <Waiman.Long@...com>, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org,
Peter Zijlstra <peterz@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Andi Kleen <andi@...stfloor.org>,
"Chandramouleeswaran, Aswin" <aswin@...com>,
"Norton, Scott J" <scott.norton@...com>
Subject: [PATCH v3 13/25] vfs: Change how dentry's d_lock and d_count fields are accessed
Because of the changes made in dcache.h header file, files that use
the d_lock and d_count fields of the dentry structure need to be
changed accordingly. All the d_lock's spin_lock() and spin_unlock()
calls are replaced by the corresponding d_lock() and d_unlock() calls.
References to d_count are replaced by the d_ret_count() calls.
There is no change in logic and everything should just work.
Signed-off-by: Waiman Long <Waiman.Long@...com>
---
fs/dcookies.c | 8 ++++----
fs/fs-writeback.c | 4 ++--
fs/libfs.c | 36 ++++++++++++++++++------------------
fs/namei.c | 28 ++++++++++++++--------------
fs/namespace.c | 10 +++++-----
5 files changed, 43 insertions(+), 43 deletions(-)
diff --git a/fs/dcookies.c b/fs/dcookies.c
index ab5954b..fa674e8 100644
--- a/fs/dcookies.c
+++ b/fs/dcookies.c
@@ -99,9 +99,9 @@ static struct dcookie_struct *alloc_dcookie(struct path *path)
return NULL;
d = path->dentry;
- spin_lock(&d->d_lock);
+ d_lock(d);
d->d_flags |= DCACHE_COOKIE;
- spin_unlock(&d->d_lock);
+ d_unlock(d);
dcs->path = *path;
path_get(path);
@@ -272,9 +272,9 @@ static void free_dcookie(struct dcookie_struct * dcs)
{
struct dentry *d = dcs->path.dentry;
- spin_lock(&d->d_lock);
+ d_lock(d);
d->d_flags &= ~DCACHE_COOKIE;
- spin_unlock(&d->d_lock);
+ d_unlock(d);
path_put(&dcs->path);
kmem_cache_free(dcookie_cache, dcs);
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 3be5718..a8d95d6 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1073,7 +1073,7 @@ static noinline void block_dump___mark_inode_dirty(struct inode *inode)
dentry = d_find_alias(inode);
if (dentry) {
- spin_lock(&dentry->d_lock);
+ d_lock(dentry);
name = (const char *) dentry->d_name.name;
}
printk(KERN_DEBUG
@@ -1081,7 +1081,7 @@ static noinline void block_dump___mark_inode_dirty(struct inode *inode)
current->comm, task_pid_nr(current), inode->i_ino,
name, inode->i_sb->s_id);
if (dentry) {
- spin_unlock(&dentry->d_lock);
+ d_unlock(dentry);
dput(dentry);
}
}
diff --git a/fs/libfs.c b/fs/libfs.c
index 916da8c..5cba740 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -102,21 +102,21 @@ loff_t dcache_dir_lseek(struct file *file, loff_t offset, int whence)
struct dentry *cursor = file->private_data;
loff_t n = file->f_pos - 2;
- spin_lock(&dentry->d_lock);
+ d_lock(dentry);
/* d_lock not required for cursor */
list_del(&cursor->d_u.d_child);
p = dentry->d_subdirs.next;
while (n && p != &dentry->d_subdirs) {
struct dentry *next;
next = list_entry(p, struct dentry, d_u.d_child);
- spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
+ d_lock_nested(next, DENTRY_D_LOCK_NESTED);
if (simple_positive(next))
n--;
- spin_unlock(&next->d_lock);
+ d_unlock(next);
p = p->next;
}
list_add_tail(&cursor->d_u.d_child, p);
- spin_unlock(&dentry->d_lock);
+ d_unlock(dentry);
}
}
mutex_unlock(&dentry->d_inode->i_mutex);
@@ -159,35 +159,35 @@ int dcache_readdir(struct file * filp, void * dirent, filldir_t filldir)
i++;
/* fallthrough */
default:
- spin_lock(&dentry->d_lock);
+ d_lock(dentry);
if (filp->f_pos == 2)
list_move(q, &dentry->d_subdirs);
for (p=q->next; p != &dentry->d_subdirs; p=p->next) {
struct dentry *next;
next = list_entry(p, struct dentry, d_u.d_child);
- spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
+ d_lock_nested(next, DENTRY_D_LOCK_NESTED);
if (!simple_positive(next)) {
- spin_unlock(&next->d_lock);
+ d_unlock(next);
continue;
}
- spin_unlock(&next->d_lock);
- spin_unlock(&dentry->d_lock);
+ d_unlock(next);
+ d_unlock(dentry);
if (filldir(dirent, next->d_name.name,
next->d_name.len, filp->f_pos,
next->d_inode->i_ino,
dt_type(next->d_inode)) < 0)
return 0;
- spin_lock(&dentry->d_lock);
- spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
+ d_lock(dentry);
+ d_lock_nested(next, DENTRY_D_LOCK_NESTED);
/* next is still alive */
list_move(q, p);
- spin_unlock(&next->d_lock);
+ d_unlock(next);
p = q;
filp->f_pos++;
}
- spin_unlock(&dentry->d_lock);
+ d_unlock(dentry);
}
return 0;
}
@@ -288,18 +288,18 @@ int simple_empty(struct dentry *dentry)
struct dentry *child;
int ret = 0;
- spin_lock(&dentry->d_lock);
+ d_lock(dentry);
list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child) {
- spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED);
+ d_lock_nested(child, DENTRY_D_LOCK_NESTED);
if (simple_positive(child)) {
- spin_unlock(&child->d_lock);
+ d_unlock(child);
goto out;
}
- spin_unlock(&child->d_lock);
+ d_unlock(child);
}
ret = 1;
out:
- spin_unlock(&dentry->d_lock);
+ d_unlock(dentry);
return ret;
}
diff --git a/fs/namei.c b/fs/namei.c
index 9ed9361..848cb78 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -518,7 +518,7 @@ static int unlazy_walk(struct nameidata *nd, struct dentry *dentry)
nd->root.dentry != fs->root.dentry)
goto err_root;
}
- spin_lock(&parent->d_lock);
+ d_lock(parent);
if (!dentry) {
if (!__d_rcu_to_refcount(parent, nd->seq))
goto err_parent;
@@ -526,7 +526,7 @@ static int unlazy_walk(struct nameidata *nd, struct dentry *dentry)
} else {
if (dentry->d_parent != parent)
goto err_parent;
- spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
+ d_lock_nested(dentry, DENTRY_D_LOCK_NESTED);
if (!__d_rcu_to_refcount(dentry, nd->seq))
goto err_child;
/*
@@ -536,11 +536,11 @@ static int unlazy_walk(struct nameidata *nd, struct dentry *dentry)
* a reference at this point.
*/
BUG_ON(!IS_ROOT(dentry) && dentry->d_parent != parent);
- BUG_ON(!parent->d_count);
- parent->d_count++;
- spin_unlock(&dentry->d_lock);
+ BUG_ON(!d_ret_count(parent));
+ d_ret_count(parent)++;
+ d_unlock(dentry);
}
- spin_unlock(&parent->d_lock);
+ d_unlock(parent);
if (want_root) {
path_get(&nd->root);
spin_unlock(&fs->lock);
@@ -552,9 +552,9 @@ static int unlazy_walk(struct nameidata *nd, struct dentry *dentry)
return 0;
err_child:
- spin_unlock(&dentry->d_lock);
+ d_unlock(dentry);
err_parent:
- spin_unlock(&parent->d_lock);
+ d_unlock(parent);
err_root:
if (want_root)
spin_unlock(&fs->lock);
@@ -585,14 +585,14 @@ static int complete_walk(struct nameidata *nd)
nd->flags &= ~LOOKUP_RCU;
if (!(nd->flags & LOOKUP_ROOT))
nd->root.mnt = NULL;
- spin_lock(&dentry->d_lock);
+ d_lock(dentry);
if (unlikely(!__d_rcu_to_refcount(dentry, nd->seq))) {
- spin_unlock(&dentry->d_lock);
+ d_unlock(dentry);
unlock_rcu_walk();
return -ECHILD;
}
BUG_ON(nd->inode != dentry->d_inode);
- spin_unlock(&dentry->d_lock);
+ d_unlock(dentry);
mntget(nd->path.mnt);
unlock_rcu_walk();
}
@@ -3279,10 +3279,10 @@ SYSCALL_DEFINE2(mkdir, const char __user *, pathname, umode_t, mode)
void dentry_unhash(struct dentry *dentry)
{
shrink_dcache_parent(dentry);
- spin_lock(&dentry->d_lock);
- if (dentry->d_count == 1)
+ d_lock(dentry);
+ if (d_ret_count(dentry) == 1)
__d_drop(dentry);
- spin_unlock(&dentry->d_lock);
+ d_unlock(dentry);
}
int vfs_rmdir(struct inode *dir, struct dentry *dentry)
diff --git a/fs/namespace.c b/fs/namespace.c
index 7b1ca9b..a6bfdc6 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -626,14 +626,14 @@ static struct mountpoint *new_mountpoint(struct dentry *dentry)
if (!mp)
return ERR_PTR(-ENOMEM);
- spin_lock(&dentry->d_lock);
+ d_lock(dentry);
if (d_unlinked(dentry)) {
- spin_unlock(&dentry->d_lock);
+ d_unlock(dentry);
kfree(mp);
return ERR_PTR(-ENOENT);
}
dentry->d_flags |= DCACHE_MOUNTED;
- spin_unlock(&dentry->d_lock);
+ d_unlock(dentry);
mp->m_dentry = dentry;
mp->m_count = 1;
list_add(&mp->m_hash, chain);
@@ -644,9 +644,9 @@ static void put_mountpoint(struct mountpoint *mp)
{
if (!--mp->m_count) {
struct dentry *dentry = mp->m_dentry;
- spin_lock(&dentry->d_lock);
+ d_lock(dentry);
dentry->d_flags &= ~DCACHE_MOUNTED;
- spin_unlock(&dentry->d_lock);
+ d_unlock(dentry);
list_del(&mp->m_hash);
kfree(mp);
}
--
1.7.1
--
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