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authorStefan Behrens <sbehrens@giantdisaster.de>2012-11-02 19:44:58 +0400
committerJosef Bacik <jbacik@fusionio.com>2012-12-13 02:15:32 +0400
commitb6bfebc13218f1fc1502041a810919d3a81b8b4e (patch)
tree65b6daaa1395fbae0d2e7aee5cb94d54974af5c7 /fs/btrfs/scrub.c
parent34f5c8e90b3f002672cd6b4e6e7c5b959fd981ae (diff)
downloadlinux-b6bfebc13218f1fc1502041a810919d3a81b8b4e.tar.xz
Btrfs: cleanup scrub bio and worker wait code
Just move some code into functions to make everything more readable. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'fs/btrfs/scrub.c')
-rw-r--r--fs/btrfs/scrub.c106
1 files changed, 71 insertions, 35 deletions
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index fcd5bccaa4ed..a67b1a17a009 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2011 STRATO. All rights reserved.
+ * Copyright (C) 2011, 2012 STRATO. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
@@ -104,8 +104,8 @@ struct scrub_ctx {
struct btrfs_root *dev_root;
int first_free;
int curr;
- atomic_t in_flight;
- atomic_t fixup_cnt;
+ atomic_t bios_in_flight;
+ atomic_t workers_pending;
spinlock_t list_lock;
wait_queue_head_t list_wait;
u16 csum_size;
@@ -146,6 +146,10 @@ struct scrub_warning {
};
+static void scrub_pending_bio_inc(struct scrub_ctx *sctx);
+static void scrub_pending_bio_dec(struct scrub_ctx *sctx);
+static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx);
+static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx);
static int scrub_handle_errored_block(struct scrub_block *sblock_to_check);
static int scrub_setup_recheck_block(struct scrub_ctx *sctx,
struct btrfs_mapping_tree *map_tree,
@@ -184,6 +188,59 @@ static void scrub_bio_end_io_worker(struct btrfs_work *work);
static void scrub_block_complete(struct scrub_block *sblock);
+static void scrub_pending_bio_inc(struct scrub_ctx *sctx)
+{
+ atomic_inc(&sctx->bios_in_flight);
+}
+
+static void scrub_pending_bio_dec(struct scrub_ctx *sctx)
+{
+ atomic_dec(&sctx->bios_in_flight);
+ wake_up(&sctx->list_wait);
+}
+
+/*
+ * used for workers that require transaction commits (i.e., for the
+ * NOCOW case)
+ */
+static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx)
+{
+ struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
+
+ /*
+ * increment scrubs_running to prevent cancel requests from
+ * completing as long as a worker is running. we must also
+ * increment scrubs_paused to prevent deadlocking on pause
+ * requests used for transactions commits (as the worker uses a
+ * transaction context). it is safe to regard the worker
+ * as paused for all matters practical. effectively, we only
+ * avoid cancellation requests from completing.
+ */
+ mutex_lock(&fs_info->scrub_lock);
+ atomic_inc(&fs_info->scrubs_running);
+ atomic_inc(&fs_info->scrubs_paused);
+ mutex_unlock(&fs_info->scrub_lock);
+ atomic_inc(&sctx->workers_pending);
+}
+
+/* used for workers that require transaction commits */
+static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx)
+{
+ struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
+
+ /*
+ * see scrub_pending_trans_workers_inc() why we're pretending
+ * to be paused in the scrub counters
+ */
+ mutex_lock(&fs_info->scrub_lock);
+ atomic_dec(&fs_info->scrubs_running);
+ atomic_dec(&fs_info->scrubs_paused);
+ mutex_unlock(&fs_info->scrub_lock);
+ atomic_dec(&sctx->workers_pending);
+ wake_up(&fs_info->scrub_pause_wait);
+ wake_up(&sctx->list_wait);
+}
+
static void scrub_free_csums(struct scrub_ctx *sctx)
{
while (!list_empty(&sctx->csum_list)) {
@@ -264,8 +321,8 @@ struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev)
sctx->nodesize = dev->dev_root->nodesize;
sctx->leafsize = dev->dev_root->leafsize;
sctx->sectorsize = dev->dev_root->sectorsize;
- atomic_set(&sctx->in_flight, 0);
- atomic_set(&sctx->fixup_cnt, 0);
+ atomic_set(&sctx->bios_in_flight, 0);
+ atomic_set(&sctx->workers_pending, 0);
atomic_set(&sctx->cancel_req, 0);
sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy);
INIT_LIST_HEAD(&sctx->csum_list);
@@ -609,14 +666,7 @@ out:
btrfs_free_path(path);
kfree(fixup);
- /* see caller why we're pretending to be paused in the scrub counters */
- mutex_lock(&fs_info->scrub_lock);
- atomic_dec(&fs_info->scrubs_running);
- atomic_dec(&fs_info->scrubs_paused);
- mutex_unlock(&fs_info->scrub_lock);
- atomic_dec(&sctx->fixup_cnt);
- wake_up(&fs_info->scrub_pause_wait);
- wake_up(&sctx->list_wait);
+ scrub_pending_trans_workers_dec(sctx);
}
/*
@@ -789,20 +839,7 @@ static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
fixup_nodatasum->logical = logical;
fixup_nodatasum->root = fs_info->extent_root;
fixup_nodatasum->mirror_num = failed_mirror_index + 1;
- /*
- * increment scrubs_running to prevent cancel requests from
- * completing as long as a fixup worker is running. we must also
- * increment scrubs_paused to prevent deadlocking on pause
- * requests used for transactions commits (as the worker uses a
- * transaction context). it is safe to regard the fixup worker
- * as paused for all matters practical. effectively, we only
- * avoid cancellation requests from completing.
- */
- mutex_lock(&fs_info->scrub_lock);
- atomic_inc(&fs_info->scrubs_running);
- atomic_inc(&fs_info->scrubs_paused);
- mutex_unlock(&fs_info->scrub_lock);
- atomic_inc(&sctx->fixup_cnt);
+ scrub_pending_trans_workers_inc(sctx);
fixup_nodatasum->work.func = scrub_fixup_nodatasum;
btrfs_queue_worker(&fs_info->scrub_workers,
&fixup_nodatasum->work);
@@ -1491,7 +1528,7 @@ static void scrub_submit(struct scrub_ctx *sctx)
sbio = sctx->bios[sctx->curr];
sctx->curr = -1;
- atomic_inc(&sctx->in_flight);
+ scrub_pending_bio_inc(sctx);
btrfsic_submit_bio(READ, sbio->bio);
}
@@ -1692,8 +1729,7 @@ static void scrub_bio_end_io_worker(struct btrfs_work *work)
sbio->next_free = sctx->first_free;
sctx->first_free = sbio->index;
spin_unlock(&sctx->list_lock);
- atomic_dec(&sctx->in_flight);
- wake_up(&sctx->list_wait);
+ scrub_pending_bio_dec(sctx);
}
static void scrub_block_complete(struct scrub_block *sblock)
@@ -1863,7 +1899,7 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
logical = base + offset;
wait_event(sctx->list_wait,
- atomic_read(&sctx->in_flight) == 0);
+ atomic_read(&sctx->bios_in_flight) == 0);
atomic_inc(&fs_info->scrubs_paused);
wake_up(&fs_info->scrub_pause_wait);
@@ -1928,7 +1964,7 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
/* push queued extents */
scrub_submit(sctx);
wait_event(sctx->list_wait,
- atomic_read(&sctx->in_flight) == 0);
+ atomic_read(&sctx->bios_in_flight) == 0);
atomic_inc(&fs_info->scrubs_paused);
wake_up(&fs_info->scrub_pause_wait);
mutex_lock(&fs_info->scrub_lock);
@@ -2218,7 +2254,7 @@ static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx,
if (ret)
return ret;
}
- wait_event(sctx->list_wait, atomic_read(&sctx->in_flight) == 0);
+ wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
return 0;
}
@@ -2363,11 +2399,11 @@ int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end,
if (!ret)
ret = scrub_enumerate_chunks(sctx, dev, start, end);
- wait_event(sctx->list_wait, atomic_read(&sctx->in_flight) == 0);
+ wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
atomic_dec(&fs_info->scrubs_running);
wake_up(&fs_info->scrub_pause_wait);
- wait_event(sctx->list_wait, atomic_read(&sctx->fixup_cnt) == 0);
+ wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0);
if (progress)
memcpy(progress, &sctx->stat, sizeof(*progress));