[PATCH 11/21] Btrfs: virtual address space subset filter
From: Ilya Dryomov <idryomov@gmail.com>
Date: 2012-01-06 14:30:59
Subsystem:
btrfs file system, filesystems (vfs and infrastructure), the rest · Maintainers:
Chris Mason, David Sterba, Alexander Viro, Christian Brauner, Linus Torvalds
Select chunks which have at least one byte located inside a given [vstart, vend) virtual address space range. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> --- fs/btrfs/volumes.c | 20 ++++++++++++++++++++ fs/btrfs/volumes.h | 1 + 2 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index a5a2d65..719e61d 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c@@ -2206,6 +2206,20 @@ static int chunk_drange_filter(struct extent_buffer *leaf, return 1; } +/* [vstart, vend) */ +static int chunk_vrange_filter(struct extent_buffer *leaf, + struct btrfs_chunk *chunk, + u64 chunk_offset, + struct btrfs_balance_args *bargs) +{ + if (chunk_offset < bargs->vend && + chunk_offset + btrfs_chunk_length(leaf, chunk) > bargs->vstart) + /* at least part of the chunk is inside this vrange */ + return 0; + + return 1; +} + static int should_balance_chunk(struct btrfs_root *root, struct extent_buffer *leaf, struct btrfs_chunk *chunk, u64 chunk_offset)
@@ -2251,6 +2265,12 @@ static int should_balance_chunk(struct btrfs_root *root, return 0; } + /* vrange filter */ + if ((bargs->flags & BTRFS_BALANCE_ARGS_VRANGE) && + chunk_vrange_filter(leaf, chunk, chunk_offset, bargs)) { + return 0; + } + return 1; }
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 75fb5f2..879afcb 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h@@ -203,6 +203,7 @@ struct map_lookup { #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1) #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2) #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3) +#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4) struct btrfs_balance_args; struct btrfs_balance_control {
--
1.7.6.3