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xfs: add discontiguous buffer support to transactions 

Now that the buffer cache supports discontiguous buffers, add
support to the transaction buffer interface for getting and reading
buffers.

Note that this patch does not convert the buffer item logging to
support discontiguous buffers. That will be done as a separate
commit.

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 18:50:11 +10:00 committed by Ben Myers
parent 6dde27077e
commit de2a4f5919
2 changed files with 79 additions and 39 deletions
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50
fs/xfs/xfs_trans.h
View File

@ -448,11 +448,51 @@ xfs_trans_t *xfs_trans_dup(xfs_trans_t *);
int xfs_trans_reserve(xfs_trans_t *, uint, uint, uint,
uint, uint);
void xfs_trans_mod_sb(xfs_trans_t *, uint, int64_t);
struct xfs_buf *xfs_trans_get_buf(xfs_trans_t *, struct xfs_buftarg *, xfs_daddr_t,
int, uint);
int xfs_trans_read_buf(struct xfs_mount *, xfs_trans_t *,
struct xfs_buftarg *, xfs_daddr_t, int, uint,
struct xfs_buf **);
struct xfs_buf *xfs_trans_get_buf_map(struct xfs_trans *tp,
struct xfs_buftarg *target,
struct xfs_buf_map *map, int nmaps,
uint flags);
static inline struct xfs_buf *
xfs_trans_get_buf(
struct xfs_trans *tp,
struct xfs_buftarg *target,
xfs_daddr_t blkno,
int numblks,
uint flags)
{
struct xfs_buf_map map = {
.bm_bn = blkno,
.bm_len = numblks,
};
return xfs_trans_get_buf_map(tp, target, &map, 1, flags);
}
int xfs_trans_read_buf_map(struct xfs_mount *mp,
struct xfs_trans *tp,
struct xfs_buftarg *target,
struct xfs_buf_map *map, int nmaps,
xfs_buf_flags_t flags,
struct xfs_buf **bpp);
static inline int
xfs_trans_read_buf(
struct xfs_mount *mp,
struct xfs_trans *tp,
struct xfs_buftarg *target,
xfs_daddr_t blkno,
int numblks,
xfs_buf_flags_t flags,
struct xfs_buf **bpp)
{
struct xfs_buf_map map = {
.bm_bn = blkno,
.bm_len = numblks,
};
return xfs_trans_read_buf_map(mp, tp, target, &map, 1, flags, bpp);
}
struct xfs_buf *xfs_trans_getsb(xfs_trans_t *, struct xfs_mount *, int);
void xfs_trans_brelse(xfs_trans_t *, struct xfs_buf *);

68
fs/xfs/xfs_trans_buf.c
View File

@ -41,20 +41,26 @@ STATIC struct xfs_buf *
xfs_trans_buf_item_match(
struct xfs_trans *tp,
struct xfs_buftarg *target,
xfs_daddr_t blkno,
int len)
struct xfs_buf_map *map,
int nmaps)
{
struct xfs_log_item_desc *lidp;
struct xfs_buf_log_item *blip;
int len = 0;
int i;
for (i = 0; i < nmaps; i++)
len += map[i].bm_len;
len = BBTOB(len);
list_for_each_entry(lidp, &tp->t_items, lid_trans) {
blip = (struct xfs_buf_log_item *)lidp->lid_item;
if (blip->bli_item.li_type == XFS_LI_BUF &&
blip->bli_buf->b_target == target &&
XFS_BUF_ADDR(blip->bli_buf) == blkno &&
BBTOB(blip->bli_buf->b_length) == len)
XFS_BUF_ADDR(blip->bli_buf) == map[0].bm_bn &&
blip->bli_buf->b_length == len) {
ASSERT(blip->bli_buf->b_map_count == nmaps);
return blip->bli_buf;
}
}
return NULL;
@ -128,21 +134,19 @@ xfs_trans_bjoin(
* If the transaction pointer is NULL, make this just a normal
* get_buf() call.
*/
xfs_buf_t *
xfs_trans_get_buf(xfs_trans_t *tp,
xfs_buftarg_t *target_dev,
xfs_daddr_t blkno,
int len,
uint flags)
struct xfs_buf *
xfs_trans_get_buf_map(
struct xfs_trans *tp,
struct xfs_buftarg *target,
struct xfs_buf_map *map,
int nmaps,
xfs_buf_flags_t flags)
{
xfs_buf_t *bp;
xfs_buf_log_item_t *bip;
/*
* Default to a normal get_buf() call if the tp is NULL.
*/
if (tp == NULL)
return xfs_buf_get(target_dev, blkno, len, flags);
if (!tp)
return xfs_buf_get_map(target, map, nmaps, flags);
/*
* If we find the buffer in the cache with this transaction
@ -150,7 +154,7 @@ xfs_trans_get_buf(xfs_trans_t *tp,
* have it locked. In this case we just increment the lock
* recursion count and return the buffer to the caller.
*/
bp = xfs_trans_buf_item_match(tp, target_dev, blkno, len);
bp = xfs_trans_buf_item_match(tp, target, map, nmaps);
if (bp != NULL) {
ASSERT(xfs_buf_islocked(bp));
if (XFS_FORCED_SHUTDOWN(tp->t_mountp)) {
@ -167,7 +171,7 @@ xfs_trans_get_buf(xfs_trans_t *tp,
return (bp);
}
bp = xfs_buf_get(target_dev, blkno, len, flags);
bp = xfs_buf_get_map(target, map, nmaps, flags);
if (bp == NULL) {
return NULL;
}
@ -246,26 +250,22 @@ int xfs_error_mod = 33;
* read_buf() call.
*/
int
xfs_trans_read_buf(
xfs_mount_t *mp,
xfs_trans_t *tp,
xfs_buftarg_t *target,
xfs_daddr_t blkno,
int len,
uint flags,
xfs_buf_t **bpp)
xfs_trans_read_buf_map(
struct xfs_mount *mp,
struct xfs_trans *tp,
struct xfs_buftarg *target,
struct xfs_buf_map *map,
int nmaps,
xfs_buf_flags_t flags,
struct xfs_buf **bpp)
{
xfs_buf_t *bp;
xfs_buf_log_item_t *bip;
int error;
*bpp = NULL;
/*
* Default to a normal get_buf() call if the tp is NULL.
*/
if (tp == NULL) {
bp = xfs_buf_read(target, blkno, len, flags);
if (!tp) {
bp = xfs_buf_read_map(target, map, nmaps, flags);
if (!bp)
return (flags & XBF_TRYLOCK) ?
EAGAIN : XFS_ERROR(ENOMEM);
@ -303,7 +303,7 @@ xfs_trans_read_buf(
* If the buffer is not yet read in, then we read it in, increment
* the lock recursion count, and return it to the caller.
*/
bp = xfs_trans_buf_item_match(tp, target, blkno, len);
bp = xfs_trans_buf_item_match(tp, target, map, nmaps);
if (bp != NULL) {
ASSERT(xfs_buf_islocked(bp));
ASSERT(bp->b_transp == tp);
@ -349,7 +349,7 @@ xfs_trans_read_buf(
return 0;
}
bp = xfs_buf_read(target, blkno, len, flags);
bp = xfs_buf_read_map(target, map, nmaps, flags);
if (bp == NULL) {
*bpp = NULL;
return (flags & XBF_TRYLOCK) ?