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xfs: add discontiguous buffer map interface

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With the internal interfaces supporting discontiguous buffer maps,
add external lookup, read and get interfaces so they can start to be
used.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Dave Chinner 2012-06-22 18:50:10 +10:00 committed by Ben Myers
parent 3e85c868a6
commit 6dde27077e
2 changed files with 58 additions and 25 deletions
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37
fs/xfs/xfs_buf.c
View File

@ -581,22 +581,21 @@ found:
* more hits than misses.
*/
struct xfs_buf *
xfs_buf_get(
xfs_buftarg_t *target,
xfs_daddr_t blkno,
size_t numblks,
xfs_buf_get_map(
struct xfs_buftarg *target,
struct xfs_buf_map *map,
int nmaps,
xfs_buf_flags_t flags)
{
struct xfs_buf *bp;
struct xfs_buf *new_bp;
int error = 0;
DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
bp = _xfs_buf_find(target, &map, 1, flags, NULL);
bp = _xfs_buf_find(target, map, nmaps, flags, NULL);
if (likely(bp))
goto found;
new_bp = _xfs_buf_alloc(target, &map, 1, flags);
new_bp = _xfs_buf_alloc(target, map, nmaps, flags);
if (unlikely(!new_bp))
return NULL;
@ -606,7 +605,7 @@ xfs_buf_get(
return NULL;
}
bp = _xfs_buf_find(target, &map, 1, flags, new_bp);
bp = _xfs_buf_find(target, map, nmaps, flags, new_bp);
if (!bp) {
xfs_buf_free(new_bp);
return NULL;
@ -649,17 +648,17 @@ _xfs_buf_read(
}
xfs_buf_t *
xfs_buf_read(
xfs_buftarg_t *target,
xfs_daddr_t blkno,
size_t numblks,
xfs_buf_read_map(
struct xfs_buftarg *target,
struct xfs_buf_map *map,
int nmaps,
xfs_buf_flags_t flags)
{
xfs_buf_t *bp;
struct xfs_buf *bp;
flags |= XBF_READ;
bp = xfs_buf_get(target, blkno, numblks, flags);
bp = xfs_buf_get_map(target, map, nmaps, flags);
if (bp) {
trace_xfs_buf_read(bp, flags, _RET_IP_);
@ -687,15 +686,15 @@ xfs_buf_read(
* safe manner.
*/
void
xfs_buf_readahead(
xfs_buftarg_t *target,
xfs_daddr_t blkno,
size_t numblks)
xfs_buf_readahead_map(
struct xfs_buftarg *target,
struct xfs_buf_map *map,
int nmaps)
{
if (bdi_read_congested(target->bt_bdi))
return;
xfs_buf_read(target, blkno, numblks,
xfs_buf_read_map(target, map, nmaps,
XBF_TRYLOCK|XBF_ASYNC|XBF_READ_AHEAD);
}

46
fs/xfs/xfs_buf.h
View File

@ -184,12 +184,46 @@ xfs_buf_alloc(
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);
struct xfs_buf *xfs_buf_read(struct xfs_buftarg *target, xfs_daddr_t blkno,
size_t numblks, xfs_buf_flags_t flags);
void xfs_buf_readahead(struct xfs_buftarg *target, xfs_daddr_t blkno,
size_t numblks);
struct xfs_buf *xfs_buf_get_map(struct xfs_buftarg *target,
struct xfs_buf_map *map, int nmaps,
xfs_buf_flags_t flags);
struct xfs_buf *xfs_buf_read_map(struct xfs_buftarg *target,
struct xfs_buf_map *map, int nmaps,
xfs_buf_flags_t flags);
void xfs_buf_readahead_map(struct xfs_buftarg *target,
struct xfs_buf_map *map, int nmaps);
static inline struct xfs_buf *
xfs_buf_get(
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_get_map(target, &map, 1, flags);
}
static inline struct xfs_buf *
xfs_buf_read(
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_read_map(target, &map, 1, flags);
}
static inline void
xfs_buf_readahead(
struct xfs_buftarg *target,
xfs_daddr_t blkno,
size_t numblks)
{
DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
return xfs_buf_readahead_map(target, &map, 1);
}
struct xfs_buf *xfs_buf_get_empty(struct xfs_buftarg *target, size_t numblks);
void xfs_buf_set_empty(struct xfs_buf *bp, size_t numblks);