From eccf081799be8d83852f183838bf26e1ca099db4 Mon Sep 17 00:00:00 2001 From: Alasdair G Kergon Date: Mon, 27 Mar 2006 01:17:42 -0800 Subject: [PATCH] [PATCH] device-mapper snapshot: fix origin_write pending_exception submission Say you have several snapshots of the same origin and then you issue a write to some place in the origin for the first time. Before the device-mapper snapshot target lets the write go through to the underlying device, it needs to make a copy of the data that is about to be overwritten. Each snapshot is independent, so it makes one copy for each snapshot. __origin_write() loops through each snapshot and checks to see whether a copy is needed for that snapshot. (A copy is only needed the first time that data changes.) If a copy is needed, the code allocates a 'pending_exception' structure holding the details. It links these together for all the snapshots, then works its way through this list and submits the copying requests to the kcopyd thread by calling start_copy(). When each request is completed, the original pending_exception structure gets freed in pending_complete(). If you're very unlucky, this structure can get freed *before* the submission process has finished walking the list. This patch: 1) Creates a new temporary list pe_queue to hold the pending exception structures; 2) Does all the bookkeeping up-front, then walks through the new list safely and calls start_copy() for each pending_exception that needed it; 3) Avoids attempting to add pe->siblings to the list if it's already connected. [NB This does not fix all the races in this code. More patches will follow.] Signed-off-by: Alasdair G Kergon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/md/dm-snap.c | 41 +++++++++++++++++++---------------------- 1 file changed, 19 insertions(+), 22 deletions(-) diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index 7401540086df..874f145431d8 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -48,6 +48,11 @@ struct pending_exception { struct bio_list origin_bios; struct bio_list snapshot_bios; + /* + * Short-term queue of pending exceptions prior to submission. + */ + struct list_head list; + /* * Other pending_exceptions that are processing this * chunk. When this list is empty, we know we can @@ -930,8 +935,9 @@ static int __origin_write(struct list_head *snapshots, struct bio *bio) int r = 1, first = 1; struct dm_snapshot *snap; struct exception *e; - struct pending_exception *pe, *last = NULL; + struct pending_exception *pe, *next_pe, *last = NULL; chunk_t chunk; + LIST_HEAD(pe_queue); /* Do all the snapshots on this origin */ list_for_each_entry (snap, snapshots, list) { @@ -965,12 +971,19 @@ static int __origin_write(struct list_head *snapshots, struct bio *bio) snap->valid = 0; } else { - if (last) + if (first) { + bio_list_add(&pe->origin_bios, bio); + r = 0; + first = 0; + } + if (last && list_empty(&pe->siblings)) list_merge(&pe->siblings, &last->siblings); - + if (!pe->started) { + pe->started = 1; + list_add_tail(&pe->list, &pe_queue); + } last = pe; - r = 0; } } @@ -980,24 +993,8 @@ static int __origin_write(struct list_head *snapshots, struct bio *bio) /* * Now that we have a complete pe list we can start the copying. */ - if (last) { - pe = last; - do { - down_write(&pe->snap->lock); - if (first) - bio_list_add(&pe->origin_bios, bio); - if (!pe->started) { - pe->started = 1; - up_write(&pe->snap->lock); - start_copy(pe); - } else - up_write(&pe->snap->lock); - first = 0; - pe = list_entry(pe->siblings.next, - struct pending_exception, siblings); - - } while (pe != last); - } + list_for_each_entry_safe(pe, next_pe, &pe_queue, list) + start_copy(pe); return r; } -- 2.20.1