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Btrfs: minor cleanup in scrub 

Just a minor cleanup commit in preparation for the big block changes.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Stefan Behrens 2012-03-27 14:21:26 -04:00 committed by Chris Mason
parent 94598ba8d8
commit 1623edebee
1 changed files with 25 additions and 36 deletions
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61
fs/btrfs/scrub.c
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@ -36,28 +36,11 @@
* Future enhancements:
* - In case an unrepairable extent is encountered, track which files are
* affected and report them
* - In case of a read error on files with nodatasum, map the file and read
* the extent to trigger a writeback of the good copy
* - track and record media errors, throw out bad devices
* - add a mode to also read unallocated space
*/
struct scrub_bio;
struct scrub_page;
struct scrub_dev;
static void scrub_bio_end_io(struct bio *bio, int err);
static void scrub_checksum(struct btrfs_work *work);
static int scrub_checksum_data(struct scrub_dev *sdev,
struct scrub_page *spag, void *buffer);
static int scrub_checksum_tree_block(struct scrub_dev *sdev,
struct scrub_page *spag, u64 logical,
void *buffer);
static int scrub_checksum_super(struct scrub_bio *sbio, void *buffer);
static int scrub_fixup_check(struct scrub_bio *sbio, int ix);
static void scrub_fixup_end_io(struct bio *bio, int err);
static int scrub_fixup_io(int rw, struct block_device *bdev, sector_t sector,
struct page *page);
static void scrub_fixup(struct scrub_bio *sbio, int ix);
#define SCRUB_PAGES_PER_BIO 16 /* 64k per bio */
#define SCRUB_BIOS_PER_DEV 16 /* 1 MB per device in flight */
@ -124,6 +107,21 @@ struct scrub_warning {
int scratch_bufsize;
};
static void scrub_bio_end_io(struct bio *bio, int err);
static void scrub_checksum(struct btrfs_work *work);
static int scrub_checksum_data(struct scrub_dev *sdev,
struct scrub_page *spag, void *buffer);
static int scrub_checksum_tree_block(struct scrub_dev *sdev,
struct scrub_page *spag, u64 logical,
void *buffer);
static int scrub_checksum_super(struct scrub_bio *sbio, void *buffer);
static int scrub_fixup_check(struct scrub_bio *sbio, int ix);
static void scrub_fixup_end_io(struct bio *bio, int err);
static int scrub_fixup_io(int rw, struct block_device *bdev, sector_t sector,
struct page *page);
static void scrub_fixup(struct scrub_bio *sbio, int ix);
static void scrub_free_csums(struct scrub_dev *sdev)
{
while (!list_empty(&sdev->csum_list)) {
@ -342,7 +340,8 @@ static void scrub_print_warning(const char *errstr, struct scrub_bio *sbio,
do {
ret = tree_backref_for_extent(&ptr, eb, ei, item_size,
&ref_root, &ref_level);
printk(KERN_WARNING "%s at logical %llu on dev %s, "
printk(KERN_WARNING
"btrfs: %s at logical %llu on dev %s, "
"sector %llu: metadata %s (level %d) in tree "
"%llu\n", errstr, swarn.logical, dev->name,
(unsigned long long)swarn.sector,
@ -948,12 +947,12 @@ static int scrub_checksum_super(struct scrub_bio *sbio, void *buffer)
return fail;
}
static int scrub_submit(struct scrub_dev *sdev)
static void scrub_submit(struct scrub_dev *sdev)
{
struct scrub_bio *sbio;
if (sdev->curr == -1)
return 0;
return;
sbio = sdev->bios[sdev->curr];
sbio->err = 0;
@ -961,8 +960,6 @@ static int scrub_submit(struct scrub_dev *sdev)
atomic_inc(&sdev->in_flight);
btrfsic_submit_bio(READ, sbio->bio);
return 0;
}
static int scrub_page(struct scrub_dev *sdev, u64 logical, u64 len,
@ -1008,9 +1005,7 @@ again:
sbio->bio = bio;
} else if (sbio->physical + sbio->count * PAGE_SIZE != physical ||
sbio->logical + sbio->count * PAGE_SIZE != logical) {
ret = scrub_submit(sdev);
if (ret)
return ret;
scrub_submit(sdev);
goto again;
}
sbio->spag[sbio->count].flags = flags;
@ -1025,9 +1020,7 @@ again:
ret = bio_add_page(sbio->bio, page, PAGE_SIZE, 0);
if (!ret) {
__free_page(page);
ret = scrub_submit(sdev);
if (ret)
return ret;
scrub_submit(sdev);
goto again;
}
@ -1036,13 +1029,8 @@ again:
memcpy(sbio->spag[sbio->count].csum, csum, sdev->csum_size);
}
++sbio->count;
if (sbio->count == SCRUB_PAGES_PER_BIO || force) {
int ret;
ret = scrub_submit(sdev);
if (ret)
return ret;
}
if (sbio->count == SCRUB_PAGES_PER_BIO || force)
scrub_submit(sdev);
return 0;
}
@ -1520,7 +1508,7 @@ static noinline_for_stack int scrub_supers(struct scrub_dev *sdev)
for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
bytenr = btrfs_sb_offset(i);
if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes)
if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
break;
ret = scrub_page(sdev, bytenr, PAGE_SIZE, bytenr,
@ -1741,6 +1729,7 @@ int btrfs_scrub_cancel_dev(struct btrfs_root *root, struct btrfs_device *dev)
return 0;
}
int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid)
{
struct btrfs_fs_info *fs_info = root->fs_info;