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xfs: simplify mappedbno handling in xfs_da_{get,read}_buf 

Shortcut the creation of xfs_bmbt_irec and xfs_buf_map for the case
where the callers passed an already mapped xfs_daddr_t.  This is in
preparation for splitting these cases out entirely later.  Also reject
the mappedbno case for xfs_da_reada_buf as no callers currently uses
it and it will be removed soon.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2019-11-20 09:46:00 -08:00 committed by Darrick J. Wong
parent 6519f708cc
commit fa0d44ec7f
1 changed files with 51 additions and 52 deletions
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103
fs/xfs/libxfs/xfs_da_btree.c
View File

@ -110,6 +110,13 @@ xfs_da_state_free(xfs_da_state_t *state)
kmem_cache_free(xfs_da_state_zone, state);
}
static inline int xfs_dabuf_nfsb(struct xfs_mount *mp, int whichfork)
{
if (whichfork == XFS_DATA_FORK)
return mp->m_dir_geo->fsbcount;
return mp->m_attr_geo->fsbcount;
}
void
xfs_da3_node_hdr_from_disk(
struct xfs_mount *mp,
@ -2539,7 +2546,7 @@ xfs_dabuf_map(
int *nmaps)
{
struct xfs_mount *mp = dp->i_mount;
int nfsb;
int nfsb = xfs_dabuf_nfsb(mp, whichfork);
int error = 0;
struct xfs_bmbt_irec irec;
struct xfs_bmbt_irec *irecs = &irec;
@ -2548,35 +2555,13 @@ xfs_dabuf_map(
ASSERT(map && *map);
ASSERT(*nmaps == 1);
if (whichfork == XFS_DATA_FORK)
nfsb = mp->m_dir_geo->fsbcount;
else
nfsb = mp->m_attr_geo->fsbcount;
/*
* Caller doesn't have a mapping. -2 means don't complain
* if we land in a hole.
*/
if (mappedbno == -1 || mappedbno == -2) {
/*
* Optimize the one-block case.
*/
if (nfsb != 1)
irecs = kmem_zalloc(sizeof(irec) * nfsb,
KM_NOFS);
nirecs = nfsb;
error = xfs_bmapi_read(dp, (xfs_fileoff_t)bno, nfsb, irecs,
&nirecs, xfs_bmapi_aflag(whichfork));
if (error)
goto out;
} else {
irecs->br_startblock = XFS_DADDR_TO_FSB(mp, mappedbno);
irecs->br_startoff = (xfs_fileoff_t)bno;
irecs->br_blockcount = nfsb;
irecs->br_state = 0;
nirecs = 1;
}
if (nfsb != 1)
irecs = kmem_zalloc(sizeof(irec) * nfsb, KM_NOFS);
nirecs = nfsb;
error = xfs_bmapi_read(dp, (xfs_fileoff_t)bno, nfsb, irecs,
&nirecs, xfs_bmapi_aflag(whichfork));
if (error)
goto out;
if (!xfs_da_map_covers_blocks(nirecs, irecs, bno, nfsb)) {
/* Caller ok with no mapping. */
@ -2616,24 +2601,29 @@ out:
*/
int
xfs_da_get_buf(
struct xfs_trans *trans,
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_dablk_t bno,
xfs_daddr_t mappedbno,
struct xfs_buf **bpp,
int whichfork)
{
struct xfs_mount *mp = dp->i_mount;
struct xfs_buf *bp;
struct xfs_buf_map map;
struct xfs_buf_map *mapp;
int nmap;
struct xfs_buf_map map, *mapp = &map;
int nmap = 1;
int error;
*bpp = NULL;
mapp = &map;
nmap = 1;
error = xfs_dabuf_map(dp, bno, mappedbno, whichfork,
&mapp, &nmap);
if (mappedbno >= 0) {
bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, mappedbno,
XFS_FSB_TO_BB(mp,
xfs_dabuf_nfsb(mp, whichfork)), 0);
goto done;
}
error = xfs_dabuf_map(dp, bno, mappedbno, whichfork, &mapp, &nmap);
if (error) {
/* mapping a hole is not an error, but we don't continue */
if (error == -1)
@ -2641,12 +2631,12 @@ xfs_da_get_buf(
goto out_free;
}
bp = xfs_trans_get_buf_map(trans, dp->i_mount->m_ddev_targp,
mapp, nmap, 0);
bp = xfs_trans_get_buf_map(tp, mp->m_ddev_targp, mapp, nmap, 0);
done:
error = bp ? bp->b_error : -EIO;
if (error) {
if (bp)
xfs_trans_brelse(trans, bp);
xfs_trans_brelse(tp, bp);
goto out_free;
}
@ -2664,7 +2654,7 @@ out_free:
*/
int
xfs_da_read_buf(
struct xfs_trans *trans,
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_dablk_t bno,
xfs_daddr_t mappedbno,
@ -2672,17 +2662,23 @@ xfs_da_read_buf(
int whichfork,
const struct xfs_buf_ops *ops)
{
struct xfs_mount *mp = dp->i_mount;
struct xfs_buf *bp;
struct xfs_buf_map map;
struct xfs_buf_map *mapp;
int nmap;
struct xfs_buf_map map, *mapp = &map;
int nmap = 1;
int error;
*bpp = NULL;
mapp = &map;
nmap = 1;
error = xfs_dabuf_map(dp, bno, mappedbno, whichfork,
&mapp, &nmap);
if (mappedbno >= 0) {
error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
mappedbno, XFS_FSB_TO_BB(mp,
xfs_dabuf_nfsb(mp, whichfork)),
0, &bp, ops);
goto done;
}
error = xfs_dabuf_map(dp, bno, mappedbno, whichfork, &mapp, &nmap);
if (error) {
/* mapping a hole is not an error, but we don't continue */
if (error == -1)
@ -2690,9 +2686,9 @@ xfs_da_read_buf(
goto out_free;
}
error = xfs_trans_read_buf_map(dp->i_mount, trans,
dp->i_mount->m_ddev_targp,
mapp, nmap, 0, &bp, ops);
error = xfs_trans_read_buf_map(mp, tp, mp->m_ddev_targp, mapp, nmap, 0,
&bp, ops);
done:
if (error)
goto out_free;
@ -2724,6 +2720,9 @@ xfs_da_reada_buf(
int nmap;
int error;
if (mappedbno >= 0)
return -EINVAL;
mapp = &map;
nmap = 1;
error = xfs_dabuf_map(dp, bno, mappedbno, whichfork,