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writeback: enforce s_umount locking in writeback_inodes_sb

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Make sure that not only sync_filesystem but all callers of writeback_inodes_sb
have the superblock protected against remount.  As-is this disables all
functionality for these callers, but the next patch relies on this locking to
fix writeback_inodes_sb for sync_filesystem.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2010-06-08 18:14:51 +02:00 • committed by Jens Axboe
commit cf37e97247
2 changed files with 8 additions and 0 deletions
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2
fs/ubifs/budget.c
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@ -62,7 +62,9 @@
*/
static void shrink_liability(struct ubifs_info *c, int nr_to_write)
{
down_read(&c->vfs_sb->s_umount);
writeback_inodes_sb(c->vfs_sb);
up_read(&c->vfs_sb->s_umount);
}
/**