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fix get_active_super()/umount() race

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This one needs restarts...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2010-03-22 20:15:33 -04:00
parent e7fe0585ca
commit 1494583de5
1 changed files with 7 additions and 7 deletions
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14
fs/super.c
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@ -471,17 +471,17 @@ struct super_block *get_active_super(struct block_device *bdev)
if (!bdev)
return NULL;
restart:
spin_lock(&sb_lock);
list_for_each_entry(sb, &super_blocks, s_list) {
if (list_empty(&sb->s_instances))
continue;
if (sb->s_bdev != bdev)
continue;
if (grab_super(sb)) /* drops sb_lock */
return sb;
spin_lock(&sb_lock);
if (sb->s_bdev == bdev) {
if (grab_super(sb)) /* drops sb_lock */
return sb;
else
goto restart;
}
}
spin_unlock(&sb_lock);
return NULL;