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authorDave Chinner <dchinner@redhat.com>2012-06-22 18:50:09 +1000
committerBen Myers <bpm@sgi.com>2012-07-01 14:50:05 -0500
commit3e85c868a697805a3d4c7800a6bacdfc81d15cdf (patch)
treec4c1ee345e2e84a6ff9abdef782cccc6293fc7c7 /fs/xfs/xfs_buf.h
parentcbb7baab285a540f173ef1ec3d5bcf9d0ad29d16 (diff)
downloadvexpress-lsk-3e85c868a697805a3d4c7800a6bacdfc81d15cdf.tar.gz
xfs: convert internal buffer functions to pass maps
While the external interface currently uses separate blockno/length variables, we need to move internal interfaces to passing and parsing vector maps. This will then allow us to add external interfaces to support discontiguous buffer maps as the internal code will already support them. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_buf.h')
-rw-r--r--fs/xfs/xfs_buf.h43
1 files changed, 35 insertions, 8 deletions
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index c9c2ba90c53..67d134994ae 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -105,6 +105,9 @@ struct xfs_buf_map {
int bm_len; /* size of I/O */
};
+#define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \
+ struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) };
+
typedef struct xfs_buf {
/*
* first cacheline holds all the fields needed for an uncontended cache
@@ -134,7 +137,9 @@ 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 */
+ struct xfs_buf_map *b_maps; /* compound buffer map */
+ struct xfs_buf_map b_map; /* inline compound buffer map */
+ int b_map_count;
int b_io_length; /* IO size in BBs */
atomic_t b_pin_count; /* pin count */
atomic_t b_io_remaining; /* #outstanding I/O requests */
@@ -149,11 +154,35 @@ typedef struct xfs_buf {
/* Finding and Reading Buffers */
-struct xfs_buf *_xfs_buf_find(struct xfs_buftarg *target, xfs_daddr_t blkno,
- size_t numblks, xfs_buf_flags_t flags,
- struct xfs_buf *new_bp);
-#define xfs_incore(buftarg,blkno,len,lockit) \
- _xfs_buf_find(buftarg, blkno ,len, lockit, NULL)
+struct xfs_buf *_xfs_buf_find(struct xfs_buftarg *target,
+ struct xfs_buf_map *map, int nmaps,
+ xfs_buf_flags_t flags, struct xfs_buf *new_bp);
+
+static inline struct xfs_buf *
+xfs_incore(
+ struct xfs_buftarg *target,
+ xfs_daddr_t blkno,
+ size_t numblks,
+ xfs_buf_flags_t flags)
+{
+ DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
+ return _xfs_buf_find(target, &map, 1, flags, NULL);
+}
+
+struct xfs_buf *_xfs_buf_alloc(struct xfs_buftarg *target,
+ struct xfs_buf_map *map, int nmaps,
+ xfs_buf_flags_t flags);
+
+static inline struct xfs_buf *
+xfs_buf_alloc(
+ struct xfs_buftarg *target,
+ xfs_daddr_t blkno,
+ size_t numblks,
+ xfs_buf_flags_t flags)
+{
+ DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
+ return _xfs_buf_alloc(target, &map, 1, flags);
+}
struct xfs_buf *xfs_buf_get(struct xfs_buftarg *target, xfs_daddr_t blkno,
size_t numblks, xfs_buf_flags_t flags);
@@ -163,8 +192,6 @@ void xfs_buf_readahead(struct xfs_buftarg *target, xfs_daddr_t blkno,
size_t numblks);
struct xfs_buf *xfs_buf_get_empty(struct xfs_buftarg *target, size_t numblks);
-struct xfs_buf *xfs_buf_alloc(struct xfs_buftarg *target, xfs_daddr_t blkno,
- size_t numblks, xfs_buf_flags_t flags);
void xfs_buf_set_empty(struct xfs_buf *bp, size_t numblks);
int xfs_buf_associate_memory(struct xfs_buf *bp, void *mem, size_t length);