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author | Linus Torvalds | 2018-08-17 18:52:15 +0200 |
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committer | Linus Torvalds | 2018-08-17 18:52:15 +0200 |
commit | b0e5c29426940bd6f137b6a3222fe87766323ae5 (patch) | |
tree | f005473e83be269f7a69a43af5c304a3fe4c3e0c /drivers/md/dm-snap.c | |
parent | Merge tag 'fsnotify_for_v4.19-rc1' of git://git.kernel.org/pub/scm/linux/kern... (diff) | |
parent | dm writecache: fix a crash due to reading past end of dirty_bitmap (diff) | |
download | kernel-qcow2-linux-b0e5c29426940bd6f137b6a3222fe87766323ae5.tar.gz kernel-qcow2-linux-b0e5c29426940bd6f137b6a3222fe87766323ae5.tar.xz kernel-qcow2-linux-b0e5c29426940bd6f137b6a3222fe87766323ae5.zip |
Merge tag 'for-4.19/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
Pull device mapper updates from Mike Snitzer:
- A couple stable fixes for the DM writecache target.
- A stable fix for the DM cache target that fixes the potential for
data corruption after an unclean shutdown of a cache device using
writeback mode.
- Update DM integrity target to allow the metadata to be stored on a
separate device from data.
- Fix DM kcopyd and the snapshot target to cond_resched() where
appropriate and be more efficient with processing completed work.
- A few fixes and improvements for DM crypt.
- Add DM delay target feature to configure delay of flushes independent
of writes.
- Update DM thin-provisioning target to include metadata_low_watermark
threshold in pool status.
- Fix stale DM thin-provisioning Documentation.
* tag 'for-4.19/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: (26 commits)
dm writecache: fix a crash due to reading past end of dirty_bitmap
dm crypt: don't decrease device limits
dm cache metadata: set dirty on all cache blocks after a crash
dm snapshot: remove stale FIXME in snapshot_map()
dm snapshot: improve performance by switching out_of_order_list to rbtree
dm kcopyd: avoid softlockup in run_complete_job
dm cache metadata: save in-core policy_hint_size to on-disk superblock
dm thin: stop no_space_timeout worker when switching to write-mode
dm kcopyd: return void from dm_kcopyd_copy()
dm thin: include metadata_low_watermark threshold in pool status
dm writecache: report start_sector in status line
dm crypt: convert essiv from ahash to shash
dm crypt: use wake_up_process() instead of a wait queue
dm integrity: recalculate checksums on creation
dm integrity: flush journal on suspend when using separate metadata device
dm integrity: use version 2 for separate metadata
dm integrity: allow separate metadata device
dm integrity: add ic->start in get_data_sector()
dm integrity: report provided data sectors in the status
dm integrity: implement fair range locks
...
Diffstat (limited to 'drivers/md/dm-snap.c')
-rw-r--r-- | drivers/md/dm-snap.c | 41 |
1 files changed, 26 insertions, 15 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index 97de7a7334d4..ae4b33d10924 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -85,7 +85,7 @@ struct dm_snapshot { * A list of pending exceptions that completed out of order. * Protected by kcopyd single-threaded callback. */ - struct list_head out_of_order_list; + struct rb_root out_of_order_tree; mempool_t pending_pool; @@ -200,7 +200,7 @@ struct dm_snap_pending_exception { /* A sequence number, it is used for in-order completion. */ sector_t exception_sequence; - struct list_head out_of_order_entry; + struct rb_node out_of_order_node; /* * For writing a complete chunk, bypassing the copy. @@ -1173,7 +1173,7 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv) atomic_set(&s->pending_exceptions_count, 0); s->exception_start_sequence = 0; s->exception_complete_sequence = 0; - INIT_LIST_HEAD(&s->out_of_order_list); + s->out_of_order_tree = RB_ROOT; mutex_init(&s->lock); INIT_LIST_HEAD(&s->list); spin_lock_init(&s->pe_lock); @@ -1539,28 +1539,41 @@ static void copy_callback(int read_err, unsigned long write_err, void *context) pe->copy_error = read_err || write_err; if (pe->exception_sequence == s->exception_complete_sequence) { + struct rb_node *next; + s->exception_complete_sequence++; complete_exception(pe); - while (!list_empty(&s->out_of_order_list)) { - pe = list_entry(s->out_of_order_list.next, - struct dm_snap_pending_exception, out_of_order_entry); + next = rb_first(&s->out_of_order_tree); + while (next) { + pe = rb_entry(next, struct dm_snap_pending_exception, + out_of_order_node); if (pe->exception_sequence != s->exception_complete_sequence) break; + next = rb_next(next); s->exception_complete_sequence++; - list_del(&pe->out_of_order_entry); + rb_erase(&pe->out_of_order_node, &s->out_of_order_tree); complete_exception(pe); + cond_resched(); } } else { - struct list_head *lh; + struct rb_node *parent = NULL; + struct rb_node **p = &s->out_of_order_tree.rb_node; struct dm_snap_pending_exception *pe2; - list_for_each_prev(lh, &s->out_of_order_list) { - pe2 = list_entry(lh, struct dm_snap_pending_exception, out_of_order_entry); - if (pe2->exception_sequence < pe->exception_sequence) - break; + while (*p) { + pe2 = rb_entry(*p, struct dm_snap_pending_exception, out_of_order_node); + parent = *p; + + BUG_ON(pe->exception_sequence == pe2->exception_sequence); + if (pe->exception_sequence < pe2->exception_sequence) + p = &((*p)->rb_left); + else + p = &((*p)->rb_right); } - list_add(&pe->out_of_order_entry, lh); + + rb_link_node(&pe->out_of_order_node, parent, p); + rb_insert_color(&pe->out_of_order_node, &s->out_of_order_tree); } } @@ -1694,8 +1707,6 @@ static int snapshot_map(struct dm_target *ti, struct bio *bio) if (!s->valid) return DM_MAPIO_KILL; - /* FIXME: should only take write lock if we need - * to copy an exception */ mutex_lock(&s->lock); if (!s->valid || (unlikely(s->snapshot_overflowed) && |