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btrfs: btrfs_multi_bio replaced with btrfs_bio

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btrfs_bio is a bio abstraction able to split and not complete after the last
bio has returned (like the old btrfs_multi_bio). Additionally, btrfs_bio
tracks the mirror_num used to read data which can be used for error
correction purposes.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
This commit is contained in:
Jan Schmidt
2011-08-04 17:15:33 +02:00
parent d7728c960d
commit a1d3c4786a
4 changed files with 90 additions and 78 deletions
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20
fs/btrfs/scrub.c
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@@ -572,7 +572,7 @@ static void scrub_fixup(struct scrub_bio *sbio, int ix)
struct scrub_dev *sdev = sbio->sdev;
struct btrfs_fs_info *fs_info = sdev->dev->dev_root->fs_info;
struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
struct btrfs_multi_bio *multi = NULL;
struct btrfs_bio *bbio = NULL;
struct scrub_fixup_nodatasum *fixup;
u64 logical = sbio->logical + ix * PAGE_SIZE;
u64 length;
@@ -610,8 +610,8 @@ static void scrub_fixup(struct scrub_bio *sbio, int ix)
length = PAGE_SIZE;
ret = btrfs_map_block(map_tree, REQ_WRITE, logical, &length,
&multi, 0);
if (ret || !multi || length < PAGE_SIZE) {
&bbio, 0);
if (ret || !bbio || length < PAGE_SIZE) {
printk(KERN_ERR
"scrub_fixup: btrfs_map_block failed us for %llu\n",
(unsigned long long)logical);
@@ -619,19 +619,19 @@ static void scrub_fixup(struct scrub_bio *sbio, int ix)
return;
}
if (multi->num_stripes == 1)
if (bbio->num_stripes == 1)
/* there aren't any replicas */
goto uncorrectable;
/*
* first find a good copy
*/
for (i = 0; i < multi->num_stripes; ++i) {
for (i = 0; i < bbio->num_stripes; ++i) {
if (i + 1 == sbio->spag[ix].mirror_num)
continue;
if (scrub_fixup_io(READ, multi->stripes[i].dev->bdev,
multi->stripes[i].physical >> 9,
if (scrub_fixup_io(READ, bbio->stripes[i].dev->bdev,
bbio->stripes[i].physical >> 9,
sbio->bio->bi_io_vec[ix].bv_page)) {
/* I/O-error, this is not a good copy */
continue;
@@ -640,7 +640,7 @@ static void scrub_fixup(struct scrub_bio *sbio, int ix)
if (scrub_fixup_check(sbio, ix) == 0)
break;
}
if (i == multi->num_stripes)
if (i == bbio->num_stripes)
goto uncorrectable;
if (!sdev->readonly) {
@@ -655,7 +655,7 @@ static void scrub_fixup(struct scrub_bio *sbio, int ix)
}
}
kfree(multi);
kfree(bbio);
spin_lock(&sdev->stat_lock);
++sdev->stat.corrected_errors;
spin_unlock(&sdev->stat_lock);
@@ -665,7 +665,7 @@ static void scrub_fixup(struct scrub_bio *sbio, int ix)
return;
uncorrectable:
kfree(multi);
kfree(bbio);
spin_lock(&sdev->stat_lock);
++sdev->stat.uncorrectable_errors;
spin_unlock(&sdev->stat_lock);