Select chunks which have at least one byte of at least one stripe
located on a device with devid X in a given [pstart,pend) physical
address range.
This filter only works when devid filter is turned on.
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
---
fs/btrfs/volumes.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/volumes.h | 1 +
2 files changed, 46 insertions(+), 0 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index ce2a9e0..4393f6d 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2237,6 +2237,45 @@ static int chunk_devid_filter(struct extent_buffer *leaf,
return 1;
}
+/* [pstart, pend) */
+static int chunk_drange_filter(struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk,
+ u64 chunk_offset,
+ struct btrfs_restripe_args *rargs)
+{
+ struct btrfs_stripe *stripe;
+ int num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
+ u64 stripe_offset;
+ u64 stripe_length;
+ int factor;
+ int i;
+
+ BUG_ON(!(rargs->flags & BTRFS_RESTRIPE_ARGS_DEVID));
+
+ if (btrfs_chunk_type(leaf, chunk) & (BTRFS_BLOCK_GROUP_DUP |
+ BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10))
+ factor = 2;
+ else
+ factor = 1;
+ factor = num_stripes / factor;
+
+ for (i = 0; i < num_stripes; i++) {
+ stripe = btrfs_stripe_nr(chunk, i);
+ if (btrfs_stripe_devid(leaf, stripe) != rargs->devid)
+ continue;
+
+ stripe_offset = btrfs_stripe_offset(leaf, stripe);
+ stripe_length = btrfs_chunk_length(leaf, chunk);
+ do_div(stripe_length, factor);
+
+ if (stripe_offset < rargs->pend &&
+ stripe_offset + stripe_length > rargs->pstart)
+ return 0;
+ }
+
+ return 1;
+}
+
static int chunk_soft_convert_filter(u64 chunk_profile,
struct btrfs_restripe_args *rargs)
{
@@ -2292,6 +2331,12 @@ static int should_restripe_chunk(struct btrfs_root *root,
return 0;
}
+ /* drange filter, makes sense only with devid filter */
+ if ((rargs->flags & BTRFS_RESTRIPE_ARGS_DRANGE) &&
+ chunk_drange_filter(leaf, chunk, chunk_offset, rargs)) {
+ return 0;
+ }
+
/* soft profile changing mode */
if ((rargs->flags & BTRFS_RESTRIPE_ARGS_SOFT) &&
chunk_soft_convert_filter(chunk_type, rargs)) {
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 1b8dc3e..8d4bbcb 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -188,6 +188,7 @@ struct map_lookup {
#define BTRFS_RESTRIPE_ARGS_PROFILES (1ULL << 0)
#define BTRFS_RESTRIPE_ARGS_USAGE (1ULL << 1)
#define BTRFS_RESTRIPE_ARGS_DEVID (1ULL << 2)
+#define BTRFS_RESTRIPE_ARGS_DRANGE (1ULL << 3)
/*
* Profile changing flags. When SOFT is set we won't relocate chunk if
--
1.7.5.4
--
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