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authorMiao Xie <miaox@cn.fujitsu.com>2014-10-23 10:42:50 +0400
committerMiao Xie <miaox@cn.fujitsu.com>2014-12-03 05:18:45 +0300
commitaf8e2d1df9848b39dd86b1e696bf8781d2020a88 (patch)
tree0abf72105056f1c5fe7038c37f4c5d63ea29c875 /fs/btrfs/raid56.c
parentb89e1b012c7f81123344058d5f245b844464d30c (diff)
downloadlinux-af8e2d1df9848b39dd86b1e696bf8781d2020a88.tar.xz
Btrfs, scrub: repair the common data on RAID5/6 if it is corrupted
This patch implement the RAID5/6 common data repair function, the implementation is similar to the scrub on the other RAID such as RAID1, the differentia is that we don't read the data from the mirror, we use the data repair function of RAID5/6. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Diffstat (limited to 'fs/btrfs/raid56.c')
-rw-r--r--fs/btrfs/raid56.c52
1 files changed, 40 insertions, 12 deletions
diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
index c54b0e64c590..95053a903474 100644
--- a/fs/btrfs/raid56.c
+++ b/fs/btrfs/raid56.c
@@ -58,6 +58,15 @@
*/
#define RBIO_CACHE_READY_BIT 3
+/*
+ * bbio and raid_map is managed by the caller, so we shouldn't free
+ * them here. And besides that, all rbios with this flag should not
+ * be cached, because we need raid_map to check the rbios' stripe
+ * is the same or not, but it is very likely that the caller has
+ * free raid_map, so don't cache those rbios.
+ */
+#define RBIO_HOLD_BBIO_MAP_BIT 4
+
#define RBIO_CACHE_SIZE 1024
struct btrfs_raid_bio {
@@ -799,6 +808,21 @@ done_nolock:
remove_rbio_from_cache(rbio);
}
+static inline void
+__free_bbio_and_raid_map(struct btrfs_bio *bbio, u64 *raid_map, int need)
+{
+ if (need) {
+ kfree(raid_map);
+ kfree(bbio);
+ }
+}
+
+static inline void free_bbio_and_raid_map(struct btrfs_raid_bio *rbio)
+{
+ __free_bbio_and_raid_map(rbio->bbio, rbio->raid_map,
+ !test_bit(RBIO_HOLD_BBIO_MAP_BIT, &rbio->flags));
+}
+
static void __free_raid_bio(struct btrfs_raid_bio *rbio)
{
int i;
@@ -817,8 +841,9 @@ static void __free_raid_bio(struct btrfs_raid_bio *rbio)
rbio->stripe_pages[i] = NULL;
}
}
- kfree(rbio->raid_map);
- kfree(rbio->bbio);
+
+ free_bbio_and_raid_map(rbio);
+
kfree(rbio);
}
@@ -933,11 +958,8 @@ static struct btrfs_raid_bio *alloc_rbio(struct btrfs_root *root,
rbio = kzalloc(sizeof(*rbio) + num_pages * sizeof(struct page *) * 2,
GFP_NOFS);
- if (!rbio) {
- kfree(raid_map);
- kfree(bbio);
+ if (!rbio)
return ERR_PTR(-ENOMEM);
- }
bio_list_init(&rbio->bio_list);
INIT_LIST_HEAD(&rbio->plug_list);
@@ -1692,8 +1714,10 @@ int raid56_parity_write(struct btrfs_root *root, struct bio *bio,
struct blk_plug_cb *cb;
rbio = alloc_rbio(root, bbio, raid_map, stripe_len);
- if (IS_ERR(rbio))
+ if (IS_ERR(rbio)) {
+ __free_bbio_and_raid_map(bbio, raid_map, 1);
return PTR_ERR(rbio);
+ }
bio_list_add(&rbio->bio_list, bio);
rbio->bio_list_bytes = bio->bi_iter.bi_size;
@@ -1888,7 +1912,8 @@ cleanup:
cleanup_io:
if (rbio->read_rebuild) {
- if (err == 0)
+ if (err == 0 &&
+ !test_bit(RBIO_HOLD_BBIO_MAP_BIT, &rbio->flags))
cache_rbio_pages(rbio);
else
clear_bit(RBIO_CACHE_READY_BIT, &rbio->flags);
@@ -2038,15 +2063,19 @@ cleanup:
*/
int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
struct btrfs_bio *bbio, u64 *raid_map,
- u64 stripe_len, int mirror_num)
+ u64 stripe_len, int mirror_num, int hold_bbio)
{
struct btrfs_raid_bio *rbio;
int ret;
rbio = alloc_rbio(root, bbio, raid_map, stripe_len);
- if (IS_ERR(rbio))
+ if (IS_ERR(rbio)) {
+ __free_bbio_and_raid_map(bbio, raid_map, !hold_bbio);
return PTR_ERR(rbio);
+ }
+ if (hold_bbio)
+ set_bit(RBIO_HOLD_BBIO_MAP_BIT, &rbio->flags);
rbio->read_rebuild = 1;
bio_list_add(&rbio->bio_list, bio);
rbio->bio_list_bytes = bio->bi_iter.bi_size;
@@ -2054,8 +2083,7 @@ int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
rbio->faila = find_logical_bio_stripe(rbio, bio);
if (rbio->faila == -1) {
BUG();
- kfree(raid_map);
- kfree(bbio);
+ __free_bbio_and_raid_map(bbio, raid_map, !hold_bbio);
kfree(rbio);
return -EIO;
}