diff options
Diffstat (limited to 'fs/xfs/xfs_buf.h')
| -rw-r--r-- | fs/xfs/xfs_buf.h | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h index 7f1d1392ce37..c9c2ba90c53c 100644 --- a/fs/xfs/xfs_buf.h +++ b/fs/xfs/xfs_buf.h @@ -58,6 +58,7 @@ typedef enum { #define _XBF_PAGES (1 << 20)/* backed by refcounted pages */ #define _XBF_KMEM (1 << 21)/* backed by heap memory */ #define _XBF_DELWRI_Q (1 << 22)/* buffer on a delwri queue */ +#define _XBF_COMPOUND (1 << 23)/* compound buffer */ typedef unsigned int xfs_buf_flags_t; @@ -75,7 +76,8 @@ typedef unsigned int xfs_buf_flags_t; { XBF_UNMAPPED, "UNMAPPED" }, /* ditto */\ { _XBF_PAGES, "PAGES" }, \ { _XBF_KMEM, "KMEM" }, \ - { _XBF_DELWRI_Q, "DELWRI_Q" } + { _XBF_DELWRI_Q, "DELWRI_Q" }, \ + { _XBF_COMPOUND, "COMPOUND" } typedef struct xfs_buftarg { dev_t bt_dev; @@ -98,6 +100,11 @@ typedef void (*xfs_buf_iodone_t)(struct xfs_buf *); #define XB_PAGES 2 +struct xfs_buf_map { + xfs_daddr_t bm_bn; /* block number for I/O */ + int bm_len; /* size of I/O */ +}; + typedef struct xfs_buf { /* * first cacheline holds all the fields needed for an uncontended cache @@ -107,7 +114,7 @@ typedef struct xfs_buf { * fast-path on locking. */ struct rb_node b_rbnode; /* rbtree node */ - xfs_daddr_t b_bn; /* block number for I/O */ + xfs_daddr_t b_bn; /* block number of buffer */ int b_length; /* size of buffer in BBs */ atomic_t b_hold; /* reference count */ atomic_t b_lru_ref; /* lru reclaim ref count */ @@ -127,12 +134,14 @@ typedef struct xfs_buf { struct xfs_trans *b_transp; struct page **b_pages; /* array of page pointers */ struct page *b_page_array[XB_PAGES]; /* inline pages */ + struct xfs_buf_map b_map; /* compound buffer map */ int b_io_length; /* IO size in BBs */ atomic_t b_pin_count; /* pin count */ atomic_t b_io_remaining; /* #outstanding I/O requests */ unsigned int b_page_count; /* size of page array */ unsigned int b_offset; /* page offset in first page */ unsigned short b_error; /* error code on I/O */ + #ifdef XFS_BUF_LOCK_TRACKING int b_last_holder; #endif @@ -233,8 +242,18 @@ void xfs_buf_stale(struct xfs_buf *bp); #define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE) #define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE) -#define XFS_BUF_ADDR(bp) ((bp)->b_bn) -#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_bn = (xfs_daddr_t)(bno)) +/* + * These macros use the IO block map rather than b_bn. b_bn is now really + * just for the buffer cache index for cached buffers. As IO does not use b_bn + * anymore, uncached buffers do not use b_bn at all and hence must modify the IO + * map directly. Uncached buffers are not allowed to be discontiguous, so this + * is safe to do. + * + * In future, uncached buffers will pass the block number directly to the io + * request function and hence these macros will go away at that point. + */ +#define XFS_BUF_ADDR(bp) ((bp)->b_map.bm_bn) +#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_map.bm_bn = (xfs_daddr_t)(bno)) static inline void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref) { |