From: Ian Kent <raven@themaw.net>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Kernel Mailing List <linux-kernel@vger.kernel.org>,
autofs mailing list <autofs@linux.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Sage Weil <sage@newdream.net>, Al Viro <viro@ZenIV.linux.org.uk>,
Andreas Dilger <adilger@sun.com>,
Christoph Hellwig <hch@infradead.org>,
Yehuda Saheh <yehuda@newdream.net>
Subject: [PATCH 04/10] autofs4 - use autofs_info for pending flag
Date: Thu, 01 Oct 2009 09:01:21 +0800 [thread overview]
Message-ID: <20091001010121.7675.79804.stgit@zeus.themaw.net> (raw)
In-Reply-To: <20091001010054.7675.77673.stgit@zeus.themaw.net>
Eliminate the use of the d_lock spin lock by using the autofs super
block info spin lock. This reduces the number of spin locks we use
by one and makes the code for the following patch (to redirect
->d_revalidate() to ->lookup()) a little simpler.
Signed-off-by: Ian Kent <raven@themaw.net>
---
fs/autofs4/autofs_i.h | 3 ++-
fs/autofs4/expire.c | 2 +-
fs/autofs4/root.c | 58 +++++++++++++++++++++++++++----------------------
3 files changed, 35 insertions(+), 28 deletions(-)
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index fe9fc23..3d283ab 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -97,6 +97,7 @@ struct autofs_info {
#define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */
#define AUTOFS_INF_MOUNTPOINT (1<<1) /* mountpoint status for direct expire */
+#define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */
struct autofs_wait_queue {
wait_queue_head_t queue;
@@ -163,7 +164,7 @@ static inline int autofs4_ispending(struct dentry *dentry)
{
struct autofs_info *inf = autofs4_dentry_ino(dentry);
- if (dentry->d_flags & DCACHE_AUTOFS_PENDING)
+ if (inf->flags & AUTOFS_INF_PENDING)
return 1;
if (inf->flags & AUTOFS_INF_EXPIRING)
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index 3da18d4..a796c94 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -27,7 +27,7 @@ static inline int autofs4_can_expire(struct dentry *dentry,
return 0;
/* No point expiring a pending mount */
- if (dentry->d_flags & DCACHE_AUTOFS_PENDING)
+ if (ino->flags & AUTOFS_INF_PENDING)
return 0;
if (!do_now) {
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index f6e8ca9..305136b 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -166,32 +166,32 @@ static int try_to_fill_dentry(struct dentry *dentry, int flags)
/* Turn this into a real negative dentry? */
if (status == -ENOENT) {
- spin_lock(&dentry->d_lock);
- dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
- spin_unlock(&dentry->d_lock);
+ spin_lock(&sbi->fs_lock);
+ ino->flags &= ~AUTOFS_INF_PENDING;
+ spin_unlock(&sbi->fs_lock);
return status;
} else if (status) {
/* Return a negative dentry, but leave it "pending" */
return status;
}
/* Trigger mount for path component or follow link */
- } else if (dentry->d_flags & DCACHE_AUTOFS_PENDING ||
+ } else if (ino->flags & AUTOFS_INF_PENDING ||
autofs4_need_mount(flags) ||
current->link_count) {
DPRINTK("waiting for mount name=%.*s",
dentry->d_name.len, dentry->d_name.name);
- spin_lock(&dentry->d_lock);
- dentry->d_flags |= DCACHE_AUTOFS_PENDING;
- spin_unlock(&dentry->d_lock);
+ spin_lock(&sbi->fs_lock);
+ ino->flags |= AUTOFS_INF_PENDING;
+ spin_unlock(&sbi->fs_lock);
status = autofs4_wait(sbi, dentry, NFY_MOUNT);
DPRINTK("mount done status=%d", status);
if (status) {
- spin_lock(&dentry->d_lock);
- dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
- spin_unlock(&dentry->d_lock);
+ spin_lock(&sbi->fs_lock);
+ ino->flags &= ~AUTOFS_INF_PENDING;
+ spin_unlock(&sbi->fs_lock);
return status;
}
}
@@ -200,9 +200,9 @@ static int try_to_fill_dentry(struct dentry *dentry, int flags)
if (ino)
ino->last_used = jiffies;
- spin_lock(&dentry->d_lock);
- dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
- spin_unlock(&dentry->d_lock);
+ spin_lock(&sbi->fs_lock);
+ ino->flags &= ~AUTOFS_INF_PENDING;
+ spin_unlock(&sbi->fs_lock);
return 0;
}
@@ -243,18 +243,23 @@ static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd)
/* We trigger a mount for almost all flags */
lookup_type = autofs4_need_mount(nd->flags);
- if (!(lookup_type || dentry->d_flags & DCACHE_AUTOFS_PENDING))
+ spin_lock(&sbi->fs_lock);
+ spin_lock(&dcache_lock);
+ if (!(lookup_type || ino->flags & AUTOFS_INF_PENDING)) {
+ spin_unlock(&dcache_lock);
+ spin_unlock(&sbi->fs_lock);
goto follow;
+ }
/*
* If the dentry contains directories then it is an autofs
* multi-mount with no root mount offset. So don't try to
* mount it again.
*/
- spin_lock(&dcache_lock);
- if (dentry->d_flags & DCACHE_AUTOFS_PENDING ||
+ if (ino->flags & AUTOFS_INF_PENDING ||
(!d_mountpoint(dentry) && __simple_empty(dentry))) {
spin_unlock(&dcache_lock);
+ spin_unlock(&sbi->fs_lock);
status = try_to_fill_dentry(dentry, 0);
if (status)
@@ -263,6 +268,7 @@ static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd)
goto follow;
}
spin_unlock(&dcache_lock);
+ spin_unlock(&sbi->fs_lock);
follow:
/*
* If there is no root mount it must be an autofs
@@ -525,9 +531,10 @@ static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, s
current->pid, task_pgrp_nr(current), sbi->catatonic, oz_mode);
unhashed = autofs4_lookup_active(sbi, dentry->d_parent, &dentry->d_name);
- if (unhashed)
+ if (unhashed) {
dentry = unhashed;
- else {
+ ino = autofs4_dentry_ino(dentry);
+ } else {
/*
* Mark the dentry incomplete but don't hash it. We do this
* to serialize our inode creation operations (symlink and
@@ -569,15 +576,14 @@ static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, s
* be quite complete but the directory has been removed
* so it must have been successful, so just wait for it.
*/
- ino = autofs4_dentry_ino(expiring);
autofs4_expire_wait(expiring);
autofs4_del_expiring(expiring);
dput(expiring);
}
- spin_lock(&dentry->d_lock);
- dentry->d_flags |= DCACHE_AUTOFS_PENDING;
- spin_unlock(&dentry->d_lock);
+ spin_lock(&sbi->fs_lock);
+ ino->flags |= AUTOFS_INF_PENDING;
+ spin_unlock(&sbi->fs_lock);
if (dentry->d_op && dentry->d_op->d_revalidate)
(dentry->d_op->d_revalidate)(dentry, nd);
mutex_lock(&dir->i_mutex);
@@ -587,7 +593,7 @@ static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, s
* If we are still pending, check if we had to handle
* a signal. If so we can force a restart..
*/
- if (dentry->d_flags & DCACHE_AUTOFS_PENDING) {
+ if (ino->flags & AUTOFS_INF_PENDING) {
/* See if we were interrupted */
if (signal_pending(current)) {
sigset_t *sigset = ¤t->pending.signal;
@@ -600,9 +606,9 @@ static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, s
}
}
if (!oz_mode) {
- spin_lock(&dentry->d_lock);
- dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
- spin_unlock(&dentry->d_lock);
+ spin_lock(&sbi->fs_lock);
+ ino->flags &= ~AUTOFS_INF_PENDING;
+ spin_unlock(&sbi->fs_lock);
}
}
next prev parent reply other threads:[~2009-10-01 1:01 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-01 1:00 [PATCH 01/10] autofs4 - use macros for active list handling Ian Kent
2009-10-01 1:01 ` [PATCH 02/10] autofs4 - use macros for expiring list Ian Kent
2009-10-01 1:01 ` [PATCH 03/10] autofs4 - use macro for need mount check Ian Kent
2009-10-01 1:01 ` Ian Kent [this message]
2009-10-01 1:01 ` [PATCH 05/10] autofs4 - renamer unhashed to active in autofs4_lookup() Ian Kent
2009-10-01 1:01 ` [PATCH 06/10] autofs4 - cleanup active and expire lookup Ian Kent
2009-10-01 1:01 ` [PATCH 07/10] autofs4 - eliminate d_unhashed in path walk checks Ian Kent
2009-10-01 1:01 ` [PATCH 08/10] autofs4 - rename dentry to active in autofs4_lookup_active() Ian Kent
2009-10-01 1:01 ` [PATCH 09/10] autofs4 - rename dentry to expiring in autofs4_lookup_expiring() Ian Kent
2009-10-01 1:02 ` [PATCH 10/10] autofs4 - always use lookup for lookup Ian Kent
2009-10-06 20:49 ` [PATCH 01/10] autofs4 - use macros for active list handling Andrew Morton
2009-10-07 3:50 ` Ian Kent
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