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In get_super() and user_get_super() restarts are unconditional 

If superblock had been still alive, we would've returned it...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2010-03-22 20:23:25 -04:00
parent 1494583de5
commit df40c01a92
1 changed files with 10 additions and 8 deletions
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18
fs/super.c
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@ -425,7 +425,7 @@ void sync_supers(void)
* mounted on the device given. %NULL is returned if no match is found.
*/
struct super_block * get_super(struct block_device *bdev)
struct super_block *get_super(struct block_device *bdev)
{
struct super_block *sb;
@ -441,13 +441,14 @@ rescan:
sb->s_count++;
spin_unlock(&sb_lock);
down_read(&sb->s_umount);
/* still alive? */
if (sb->s_root)
return sb;
up_read(&sb->s_umount);
/* restart only when sb is no longer on the list */
/* nope, got unmounted */
spin_lock(&sb_lock);
if (__put_super_and_need_restart(sb))
goto rescan;
__put_super(sb);
goto rescan;
}
}
spin_unlock(&sb_lock);
@ -487,7 +488,7 @@ restart:
return NULL;
}
struct super_block * user_get_super(dev_t dev)
struct super_block *user_get_super(dev_t dev)
{
struct super_block *sb;
@ -500,13 +501,14 @@ rescan:
sb->s_count++;
spin_unlock(&sb_lock);
down_read(&sb->s_umount);
/* still alive? */
if (sb->s_root)
return sb;
up_read(&sb->s_umount);
/* restart only when sb is no longer on the list */
/* nope, got unmounted */
spin_lock(&sb_lock);
if (__put_super_and_need_restart(sb))
goto rescan;
__put_super(sb);
goto rescan;
}
}
spin_unlock(&sb_lock);