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authorAl Viro <viro@zeniv.linux.org.uk>2010-07-25 02:31:46 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2010-08-09 16:49:02 -0400
commitdca332528bc69e05f67161e1ed59929633d5e63d (patch)
tree0ec5576d52bead57c73983d2412cfe71814b5f8d /fs/super.c
parent7a4dec53897ecd3367efb1e12fe8a4edc47dc0e9 (diff)
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no need for list_for_each_entry_safe()/resetting with superblock list
just delay __put_super() a bit Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/super.c')
-rw-r--r--fs/super.c36
1 files changed, 21 insertions, 15 deletions
diff --git a/fs/super.c b/fs/super.c
index bd9eea4bb2b..9674ab2c871 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -363,10 +363,10 @@ EXPORT_SYMBOL(drop_super);
*/
void sync_supers(void)
{
- struct super_block *sb, *n;
+ struct super_block *sb, *p = NULL;
spin_lock(&sb_lock);
- list_for_each_entry_safe(sb, n, &super_blocks, s_list) {
+ list_for_each_entry(sb, &super_blocks, s_list) {
if (list_empty(&sb->s_instances))
continue;
if (sb->s_op->write_super && sb->s_dirt) {
@@ -379,11 +379,13 @@ void sync_supers(void)
up_read(&sb->s_umount);
spin_lock(&sb_lock);
- /* lock was dropped, must reset next */
- list_safe_reset_next(sb, n, s_list);
- __put_super(sb);
+ if (p)
+ __put_super(p);
+ p = sb;
}
}
+ if (p)
+ __put_super(p);
spin_unlock(&sb_lock);
}
@@ -397,10 +399,10 @@ void sync_supers(void)
*/
void iterate_supers(void (*f)(struct super_block *, void *), void *arg)
{
- struct super_block *sb, *n;
+ struct super_block *sb, *p = NULL;
spin_lock(&sb_lock);
- list_for_each_entry_safe(sb, n, &super_blocks, s_list) {
+ list_for_each_entry(sb, &super_blocks, s_list) {
if (list_empty(&sb->s_instances))
continue;
sb->s_count++;
@@ -412,10 +414,12 @@ void iterate_supers(void (*f)(struct super_block *, void *), void *arg)
up_read(&sb->s_umount);
spin_lock(&sb_lock);
- /* lock was dropped, must reset next */
- list_safe_reset_next(sb, n, s_list);
- __put_super(sb);
+ if (p)
+ __put_super(p);
+ p = sb;
}
+ if (p)
+ __put_super(p);
spin_unlock(&sb_lock);
}
@@ -577,10 +581,10 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
static void do_emergency_remount(struct work_struct *work)
{
- struct super_block *sb, *n;
+ struct super_block *sb, *p = NULL;
spin_lock(&sb_lock);
- list_for_each_entry_safe(sb, n, &super_blocks, s_list) {
+ list_for_each_entry(sb, &super_blocks, s_list) {
if (list_empty(&sb->s_instances))
continue;
sb->s_count++;
@@ -594,10 +598,12 @@ static void do_emergency_remount(struct work_struct *work)
}
up_write(&sb->s_umount);
spin_lock(&sb_lock);
- /* lock was dropped, must reset next */
- list_safe_reset_next(sb, n, s_list);
- __put_super(sb);
+ if (p)
+ __put_super(p);
+ p = sb;
}
+ if (p)
+ __put_super(p);
spin_unlock(&sb_lock);
kfree(work);
printk("Emergency Remount complete\n");