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alistair23-linux
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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>
hifive-unleashed-5.1
Al Viro 2010-07-25 02:31:46 +04:00
parent 7a4dec5389
commit dca332528b
2 changed files with 28 additions and 20 deletions
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12
fs/dcache.c
View File

@ -536,7 +536,7 @@ restart:
*/
static void prune_dcache(int count)
{
struct super_block *sb, *n;
struct super_block *sb, *p = NULL;
int w_count;
int unused = dentry_stat.nr_unused;
int prune_ratio;
@ -550,7 +550,7 @@ static void prune_dcache(int count)
else
prune_ratio = unused / count;
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_nr_dentry_unused == 0)
@ -590,14 +590,16 @@ static void prune_dcache(int count)
up_read(&sb->s_umount);
}
spin_lock(&sb_lock);
/* lock was dropped, must reset next */
list_safe_reset_next(sb, n, s_list);
if (p)
__put_super(p);
count -= pruned;
__put_super(sb);
p = sb;
/* more work left to do? */
if (count <= 0)
break;
}
if (p)
__put_super(p);
spin_unlock(&sb_lock);
spin_unlock(&dcache_lock);
}

36
fs/super.c
View File

@ -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");