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Btrfs: virtual address space subset filter 

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>
hifive-unleashed-5.1
Ilya Dryomov 2012-01-16 22:04:48 +02:00
parent 94e60d5a5c
commit ea67176ae8
2 changed files with 21 additions and 0 deletions
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20
fs/btrfs/volumes.c
View File

@ -2207,6 +2207,20 @@ 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)
@ -2252,6 +2266,12 @@ 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;
}

1
fs/btrfs/volumes.h
View File

@ -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 {