diff options
Diffstat (limited to 'fs/xfs/xfs_buf.h')
| -rw-r--r-- | fs/xfs/xfs_buf.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h index d5d88dda4d31..995339534db6 100644 --- a/fs/xfs/xfs_buf.h +++ b/fs/xfs/xfs_buf.h @@ -88,6 +88,19 @@ typedef unsigned int xfs_buf_flags_t; */ #define XFS_BSTATE_DISPOSE (1 << 0) /* buffer being discarded */ +/* + * The xfs_buftarg contains 2 notions of "sector size" - + * + * 1) The metadata sector size, which is the minimum unit and + * alignment of IO which will be performed by metadata operations. + * 2) The device logical sector size + * + * The first is specified at mkfs time, and is stored on-disk in the + * superblock's sb_sectsize. + * + * The latter is derived from the underlying device, and controls direct IO + * alignment constraints. + */ typedef struct xfs_buftarg { dev_t bt_dev; struct block_device *bt_bdev; @@ -95,6 +108,8 @@ typedef struct xfs_buftarg { struct xfs_mount *bt_mount; unsigned int bt_meta_sectorsize; size_t bt_meta_sectormask; + size_t bt_logical_sectorsize; + size_t bt_logical_sectormask; /* LRU control structures */ struct shrinker bt_shrinker; |