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-rw-r--r--fs/btrfs/block-group.c86
-rw-r--r--fs/btrfs/block-group.h5
-rw-r--r--fs/btrfs/volumes.c69
-rw-r--r--fs/btrfs/volumes.h2
4 files changed, 91 insertions, 71 deletions
diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c
index 6480976ddc78..00cb40210b53 100644
--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -15,6 +15,7 @@
#include "tree-log.h"
#include "delalloc-space.h"
#include "discard.h"
+#include "raid56.h"
/*
* Return target flags in extended format or 0 if restripe for this chunk_type
@@ -1561,6 +1562,91 @@ static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
write_sequnlock(&fs_info->profiles_lock);
}
+/**
+ * btrfs_rmap_block - Map a physical disk address to a list of logical addresses
+ * @chunk_start: logical address of block group
+ * @physical: physical address to map to logical addresses
+ * @logical: return array of logical addresses which map to @physical
+ * @naddrs: length of @logical
+ * @stripe_len: size of IO stripe for the given block group
+ *
+ * Maps a particular @physical disk address to a list of @logical addresses.
+ * Used primarily to exclude those portions of a block group that contain super
+ * block copies.
+ */
+EXPORT_FOR_TESTS
+int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start,
+ u64 physical, u64 **logical, int *naddrs, int *stripe_len)
+{
+ struct extent_map *em;
+ struct map_lookup *map;
+ u64 *buf;
+ u64 bytenr;
+ u64 length;
+ u64 stripe_nr;
+ u64 rmap_len;
+ int i, j, nr = 0;
+
+ em = btrfs_get_chunk_map(fs_info, chunk_start, 1);
+ if (IS_ERR(em))
+ return -EIO;
+
+ map = em->map_lookup;
+ length = em->len;
+ rmap_len = map->stripe_len;
+
+ if (map->type & BTRFS_BLOCK_GROUP_RAID10)
+ length = div_u64(length, map->num_stripes / map->sub_stripes);
+ else if (map->type & BTRFS_BLOCK_GROUP_RAID0)
+ length = div_u64(length, map->num_stripes);
+ else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
+ length = div_u64(length, nr_data_stripes(map));
+ rmap_len = map->stripe_len * nr_data_stripes(map);
+ }
+
+ buf = kcalloc(map->num_stripes, sizeof(u64), GFP_NOFS);
+ BUG_ON(!buf); /* -ENOMEM */
+
+ for (i = 0; i < map->num_stripes; i++) {
+ if (map->stripes[i].physical > physical ||
+ map->stripes[i].physical + length <= physical)
+ continue;
+
+ stripe_nr = physical - map->stripes[i].physical;
+ stripe_nr = div64_u64(stripe_nr, map->stripe_len);
+
+ if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
+ stripe_nr = stripe_nr * map->num_stripes + i;
+ stripe_nr = div_u64(stripe_nr, map->sub_stripes);
+ } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
+ stripe_nr = stripe_nr * map->num_stripes + i;
+ }
+ /*
+ * The remaining case would be for RAID56, multiply by
+ * nr_data_stripes(). Alternatively, just use rmap_len below
+ * instead of map->stripe_len
+ */
+
+ bytenr = chunk_start + stripe_nr * rmap_len;
+ WARN_ON(nr >= map->num_stripes);
+ for (j = 0; j < nr; j++) {
+ if (buf[j] == bytenr)
+ break;
+ }
+ if (j == nr) {
+ WARN_ON(nr >= map->num_stripes);
+ buf[nr++] = bytenr;
+ }
+ }
+
+ *logical = buf;
+ *naddrs = nr;
+ *stripe_len = rmap_len;
+
+ free_extent_map(em);
+ return 0;
+}
+
static int exclude_super_stripes(struct btrfs_block_group *cache)
{
struct btrfs_fs_info *fs_info = cache->fs_info;
diff --git a/fs/btrfs/block-group.h b/fs/btrfs/block-group.h
index 5cf1ea33f284..107bb557ca8d 100644
--- a/fs/btrfs/block-group.h
+++ b/fs/btrfs/block-group.h
@@ -283,4 +283,9 @@ static inline int btrfs_block_group_done(struct btrfs_block_group *cache)
cache->cached == BTRFS_CACHE_ERROR;
}
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
+int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start,
+ u64 physical, u64 **logical, int *naddrs, int *stripe_len);
+#endif
+
#endif /* BTRFS_BLOCK_GROUP_H */
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 9658c53eec7b..ab1b3c35c5eb 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -6114,75 +6114,6 @@ int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
return __btrfs_map_block(fs_info, op, logical, length, bbio_ret, 0, 1);
}
-int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start,
- u64 physical, u64 **logical, int *naddrs, int *stripe_len)
-{
- struct extent_map *em;
- struct map_lookup *map;
- u64 *buf;
- u64 bytenr;
- u64 length;
- u64 stripe_nr;
- u64 rmap_len;
- int i, j, nr = 0;
-
- em = btrfs_get_chunk_map(fs_info, chunk_start, 1);
- if (IS_ERR(em))
- return -EIO;
-
- map = em->map_lookup;
- length = em->len;
- rmap_len = map->stripe_len;
-
- if (map->type & BTRFS_BLOCK_GROUP_RAID10)
- length = div_u64(length, map->num_stripes / map->sub_stripes);
- else if (map->type & BTRFS_BLOCK_GROUP_RAID0)
- length = div_u64(length, map->num_stripes);
- else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
- length = div_u64(length, nr_data_stripes(map));
- rmap_len = map->stripe_len * nr_data_stripes(map);
- }
-
- buf = kcalloc(map->num_stripes, sizeof(u64), GFP_NOFS);
- BUG_ON(!buf); /* -ENOMEM */
-
- for (i = 0; i < map->num_stripes; i++) {
- if (map->stripes[i].physical > physical ||
- map->stripes[i].physical + length <= physical)
- continue;
-
- stripe_nr = physical - map->stripes[i].physical;
- stripe_nr = div64_u64(stripe_nr, map->stripe_len);
-
- if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
- stripe_nr = stripe_nr * map->num_stripes + i;
- stripe_nr = div_u64(stripe_nr, map->sub_stripes);
- } else if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
- stripe_nr = stripe_nr * map->num_stripes + i;
- } /* else if RAID[56], multiply by nr_data_stripes().
- * Alternatively, just use rmap_len below instead of
- * map->stripe_len */
-
- bytenr = chunk_start + stripe_nr * rmap_len;
- WARN_ON(nr >= map->num_stripes);
- for (j = 0; j < nr; j++) {
- if (buf[j] == bytenr)
- break;
- }
- if (j == nr) {
- WARN_ON(nr >= map->num_stripes);
- buf[nr++] = bytenr;
- }
- }
-
- *logical = buf;
- *naddrs = nr;
- *stripe_len = rmap_len;
-
- free_extent_map(em);
- return 0;
-}
-
static inline void btrfs_end_bbio(struct btrfs_bio *bbio, struct bio *bio)
{
bio->bi_private = bbio->private;
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 81f21e42b887..9c7d4fe5c39a 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -415,8 +415,6 @@ int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
struct btrfs_bio **bbio_ret);
int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
u64 logical, u64 len, struct btrfs_io_geometry *io_geom);
-int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start,
- u64 physical, u64 **logical, int *naddrs, int *stripe_len);
int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, u64 type);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.