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xfs: introduce xfs_bmapi_read() 

xfs_bmapi() currently handles both extent map reading and
allocation. As a result, the code is littered with "if (wr)"
branches to conditionally do allocation operations if required.
This makes the code much harder to follow and causes significant
indent issues with the code.

Given that read mapping is much simpler than allocation, we can
split out read mapping from xfs_bmapi() and reuse the logic that
we have already factored out do do all the hard work of handling the
extent map manipulations. The results in a much simpler function for
the common extent read operations, and will allow the allocation
code to be simplified in another commit.

Once xfs_bmapi_read() is implemented, convert all the callers of
xfs_bmapi() that are only reading extents to use the new function.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner 2011-09-18 20:40:45 +00:00 committed by Alex Elder
parent aef9a89586
commit 5c8ed2021f
13 changed files with 151 additions and 77 deletions
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8
fs/xfs/xfs_aops.c
View File

@ -315,8 +315,8 @@ xfs_map_blocks(
count = mp->m_maxioffset - offset;
end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
offset_fsb = XFS_B_TO_FSBT(mp, offset);
error = xfs_bmapi(NULL, ip, offset_fsb, end_fsb - offset_fsb,
bmapi_flags, NULL, 0, imap, &nimaps, NULL);
error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb,
imap, &nimaps, bmapi_flags);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
if (error)
@ -1138,8 +1138,8 @@ __xfs_get_blocks(
end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + size);
offset_fsb = XFS_B_TO_FSBT(mp, offset);
error = xfs_bmapi(NULL, ip, offset_fsb, end_fsb - offset_fsb,
XFS_BMAPI_ENTIRE, NULL, 0, &imap, &nimaps, NULL);
error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb,
&imap, &nimaps, XFS_BMAPI_ENTIRE);
if (error)
goto out_unlock;

30
fs/xfs/xfs_attr.c
View File

@ -1963,10 +1963,9 @@ xfs_attr_rmtval_get(xfs_da_args_t *args)
lblkno = args->rmtblkno;
while (valuelen > 0) {
nmap = ATTR_RMTVALUE_MAPSIZE;
error = xfs_bmapi(args->trans, args->dp, (xfs_fileoff_t)lblkno,
args->rmtblkcnt,
XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
NULL, 0, map, &nmap, NULL);
error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
args->rmtblkcnt, map, &nmap,
XFS_BMAPI_ATTRFORK);
if (error)
return(error);
ASSERT(nmap >= 1);
@ -2092,14 +2091,11 @@ xfs_attr_rmtval_set(xfs_da_args_t *args)
*/
xfs_bmap_init(args->flist, args->firstblock);
nmap = 1;
error = xfs_bmapi(NULL, dp, (xfs_fileoff_t)lblkno,
args->rmtblkcnt,
XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
args->firstblock, 0, &map, &nmap,
NULL);
if (error) {
error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno,
args->rmtblkcnt, &map, &nmap,
XFS_BMAPI_ATTRFORK);
if (error)
return(error);
}
ASSERT(nmap == 1);
ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
(map.br_startblock != HOLESTARTBLOCK));
@ -2155,16 +2151,12 @@ xfs_attr_rmtval_remove(xfs_da_args_t *args)
/*
* Try to remember where we decided to put the value.
*/
xfs_bmap_init(args->flist, args->firstblock);
nmap = 1;
error = xfs_bmapi(NULL, args->dp, (xfs_fileoff_t)lblkno,
args->rmtblkcnt,
XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
args->firstblock, 0, &map, &nmap,
args->flist);
if (error) {
error = xfs_bmapi_read(args->dp, (xfs_fileoff_t)lblkno,
args->rmtblkcnt, &map, &nmap,
XFS_BMAPI_ATTRFORK);
if (error)
return(error);
}
ASSERT(nmap == 1);
ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
(map.br_startblock != HOLESTARTBLOCK));

5
fs/xfs/xfs_attr_leaf.c
View File

@ -2926,9 +2926,8 @@ xfs_attr_leaf_freextent(xfs_trans_t **trans, xfs_inode_t *dp,
* Try to remember where we decided to put the value.
*/
nmap = 1;
error = xfs_bmapi(*trans, dp, (xfs_fileoff_t)tblkno, tblkcnt,
XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
NULL, 0, &map, &nmap, NULL);
error = xfs_bmapi_read(dp, (xfs_fileoff_t)tblkno, tblkcnt,
&map, &nmap, XFS_BMAPI_ATTRFORK);
if (error) {
return(error);
}

104
fs/xfs/xfs_bmap.c
View File

@ -4349,6 +4349,98 @@ xfs_bmapi_update_map(
*map = mval;
}
/*
* Map file blocks to filesystem blocks without allocation.
*/
int
xfs_bmapi_read(
struct xfs_inode *ip,
xfs_fileoff_t bno,
xfs_filblks_t len,
struct xfs_bmbt_irec *mval,
int *nmap,
int flags)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp;
struct xfs_bmbt_irec got;
struct xfs_bmbt_irec prev;
xfs_fileoff_t obno;
xfs_fileoff_t end;
xfs_extnum_t lastx;
int error;
int eof;
int n = 0;
int whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
XFS_ATTR_FORK : XFS_DATA_FORK;
ASSERT(*nmap >= 1);
ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK|XFS_BMAPI_ENTIRE|
XFS_BMAPI_IGSTATE)));
if (unlikely(XFS_TEST_ERROR(
(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
XFS_ERROR_REPORT("xfs_bmapi_read", XFS_ERRLEVEL_LOW, mp);
return XFS_ERROR(EFSCORRUPTED);
}
if (XFS_FORCED_SHUTDOWN(mp))
return XFS_ERROR(EIO);
XFS_STATS_INC(xs_blk_mapr);
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(ifp->if_ext_max ==
XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(NULL, ip, whichfork);
if (error)
return error;
}
xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got, &prev);
end = bno + len;
obno = bno;
while (bno < end && n < *nmap) {
/* Reading past eof, act as though there's a hole up to end. */
if (eof)
got.br_startoff = end;
if (got.br_startoff > bno) {
/* Reading in a hole. */
mval->br_startoff = bno;
mval->br_startblock = HOLESTARTBLOCK;
mval->br_blockcount =
XFS_FILBLKS_MIN(len, got.br_startoff - bno);
mval->br_state = XFS_EXT_NORM;
bno += mval->br_blockcount;
len -= mval->br_blockcount;
mval++;
n++;
continue;
}
/* set up the extent map to return. */
xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
/* If we're done, stop now. */
if (bno >= end || n >= *nmap)
break;
/* Else go on to the next record. */
if (++lastx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t))
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx), &got);
else
eof = 1;
}
*nmap = n;
return 0;
}
/*
* Map file blocks to filesystem blocks.
* File range is given by the bno/len pair.
@ -5490,10 +5582,9 @@ xfs_getbmap(
do {
nmap = (nexleft > subnex) ? subnex : nexleft;
error = xfs_bmapi(NULL, ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
XFS_BB_TO_FSB(mp, bmv->bmv_length),
bmapi_flags, NULL, 0, map, &nmap,
NULL);
error = xfs_bmapi_read(ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
XFS_BB_TO_FSB(mp, bmv->bmv_length),
map, &nmap, bmapi_flags);
if (error)
goto out_free_map;
ASSERT(nmap <= subnex);
@ -6084,9 +6175,8 @@ xfs_bmap_punch_delalloc_range(
* trying to remove a real extent (which requires a
* transaction) or a hole, which is probably a bad idea...
*/
error = xfs_bmapi(NULL, ip, start_fsb, 1,
XFS_BMAPI_ENTIRE, NULL, 0, &imap,
&nimaps, NULL);
error = xfs_bmapi_read(ip, start_fsb, 1, &imap, &nimaps,
XFS_BMAPI_ENTIRE);
if (error) {
/* something screwed, just bail */

4
fs/xfs/xfs_bmap.h
View File

@ -294,6 +294,10 @@ xfs_bmapi(
int *nmap, /* i/o: mval size/count */
xfs_bmap_free_t *flist); /* i/o: list extents to free */
int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
xfs_filblks_t len, struct xfs_bmbt_irec *mval,
int *nmap, int flags);
/*
* Map file blocks to filesystem blocks, simple version.
* One block only, read-only.

9
fs/xfs/xfs_da_btree.c
View File

@ -1995,11 +1995,10 @@ xfs_da_do_buf(
} else {
mapp = kmem_alloc(sizeof(*mapp) * nfsb, KM_SLEEP);
nmap = nfsb;
if ((error = xfs_bmapi(trans, dp, (xfs_fileoff_t)bno,
nfsb,
XFS_BMAPI_METADATA |
xfs_bmapi_aflag(whichfork),
NULL, 0, mapp, &nmap, NULL)))
error = xfs_bmapi_read(dp, (xfs_fileoff_t)bno, nfsb,
mapp, &nmap,
xfs_bmapi_aflag(whichfork));
if (error)
goto exit0;
}
} else {

6
fs/xfs/xfs_dir2_leaf.c
View File

@ -888,12 +888,10 @@ xfs_dir2_leaf_getdents(
* we already have in the table.
*/
nmap = map_size - map_valid;
error = xfs_bmapi(NULL, dp,
map_off,
error = xfs_bmapi_read(dp, map_off,
xfs_dir2_byte_to_da(mp,
XFS_DIR2_LEAF_OFFSET) - map_off,
XFS_BMAPI_METADATA, NULL, 0,
&map[map_valid], &nmap, NULL);
&map[map_valid], &nmap, 0);
/*
* Don't know if we should ignore this or
* try to return an error.

5
fs/xfs/xfs_dquot.c
View File

@ -488,9 +488,8 @@ xfs_qm_dqtobp(
/*
* Find the block map; no allocations yet
*/
error = xfs_bmapi(NULL, quotip, dqp->q_fileoffset,
XFS_DQUOT_CLUSTER_SIZE_FSB, XFS_BMAPI_METADATA,
NULL, 0, &map, &nmaps, NULL);
error = xfs_bmapi_read(quotip, dqp->q_fileoffset,
XFS_DQUOT_CLUSTER_SIZE_FSB, &map, &nmaps, 0);
xfs_iunlock(quotip, XFS_ILOCK_SHARED);
if (error)

10
fs/xfs/xfs_file.c
View File

@ -509,11 +509,9 @@ xfs_zero_last_block(
last_fsb = XFS_B_TO_FSBT(mp, isize);
nimaps = 1;
error = xfs_bmapi(NULL, ip, last_fsb, 1, 0, NULL, 0, &imap,
&nimaps, NULL);
if (error) {
error = xfs_bmapi_read(ip, last_fsb, 1, &imap, &nimaps, 0);
if (error)
return error;
}
ASSERT(nimaps > 0);
/*
* If the block underlying isize is just a hole, then there
@ -604,8 +602,8 @@ xfs_zero_eof(
while (start_zero_fsb <= end_zero_fsb) {
nimaps = 1;
zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
error = xfs_bmapi(NULL, ip, start_zero_fsb, zero_count_fsb,
0, NULL, 0, &imap, &nimaps, NULL);
error = xfs_bmapi_read(ip, start_zero_fsb, zero_count_fsb,
&imap, &nimaps, 0);
if (error) {
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
return error;

12
fs/xfs/xfs_inode.c
View File

@ -1187,6 +1187,7 @@ xfs_isize_check(
xfs_fileoff_t map_first;
int nimaps;
xfs_bmbt_irec_t imaps[2];
int error;
if (!S_ISREG(ip->i_d.di_mode))
return;
@ -1203,13 +1204,12 @@ xfs_isize_check(
* The filesystem could be shutting down, so bmapi may return
* an error.
*/
if (xfs_bmapi(NULL, ip, map_first,
error = xfs_bmapi_read(ip, map_first,
(XFS_B_TO_FSB(mp,
(xfs_ufsize_t)XFS_MAXIOFFSET(mp)) -
map_first),
XFS_BMAPI_ENTIRE, NULL, 0, imaps, &nimaps,
NULL))
return;
(xfs_ufsize_t)XFS_MAXIOFFSET(mp)) - map_first),
imaps, &nimaps, XFS_BMAPI_ENTIRE);
if (error)
return;
ASSERT(nimaps == 1);
ASSERT(imaps[0].br_startblock == HOLESTARTBLOCK);
}

4
fs/xfs/xfs_iomap.c
View File

@ -300,8 +300,8 @@ xfs_iomap_eof_want_preallocate(
while (count_fsb > 0) {
imaps = nimaps;
firstblock = NULLFSBLOCK;
error = xfs_bmapi(NULL, ip, start_fsb, count_fsb, 0,
&firstblock, 0, imap, &imaps, NULL);
error = xfs_bmapi_read(ip, start_fsb, count_fsb, imap, &imaps,
0);
if (error)
return error;
for (n = 0; n < imaps; n++) {

7
fs/xfs/xfs_qm.c
View File

@ -1347,11 +1347,8 @@ xfs_qm_dqiterate(
* the inode is never added to the transaction.
*/
xfs_ilock(qip, XFS_ILOCK_SHARED);
error = xfs_bmapi(NULL, qip, lblkno,
maxlblkcnt - lblkno,
XFS_BMAPI_METADATA,
NULL,
0, map, &nmaps, NULL);
error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
map, &nmaps, 0);
xfs_iunlock(qip, XFS_ILOCK_SHARED);
if (error)
break;

24
fs/xfs/xfs_vnodeops.c
View File

@ -72,8 +72,8 @@ xfs_readlink_bmap(
xfs_buf_t *bp;
int error = 0;
error = xfs_bmapi(NULL, ip, 0, XFS_B_TO_FSB(mp, pathlen), 0, NULL, 0,
mval, &nmaps, NULL);
error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, pathlen), mval, &nmaps,
0);
if (error)
goto out;
@ -178,8 +178,7 @@ xfs_free_eofblocks(
nimaps = 1;
xfs_ilock(ip, XFS_ILOCK_SHARED);
error = xfs_bmapi(NULL, ip, end_fsb, map_len, 0,
NULL, 0, &imap, &nimaps, NULL);
error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
if (!error && (nimaps != 0) &&
@ -297,9 +296,9 @@ xfs_inactive_symlink_rmt(
done = 0;
xfs_bmap_init(&free_list, &first_block);
nmaps = ARRAY_SIZE(mval);
if ((error = xfs_bmapi(tp, ip, 0, XFS_B_TO_FSB(mp, size),
XFS_BMAPI_METADATA, &first_block, 0, mval, &nmaps,
&free_list)))
error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, size),
mval, &nmaps, 0);
if (error)
goto error0;
/*
* Invalidate the block(s).
@ -1981,8 +1980,7 @@ xfs_zero_remaining_bytes(
for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
offset_fsb = XFS_B_TO_FSBT(mp, offset);
nimap = 1;
error = xfs_bmapi(NULL, ip, offset_fsb, 1, 0,
NULL, 0, &imap, &nimap, NULL);
error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0);
if (error || nimap < 1)
break;
ASSERT(imap.br_blockcount >= 1);
@ -2101,8 +2099,8 @@ xfs_free_file_space(
*/
if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
nimap = 1;
error = xfs_bmapi(NULL, ip, startoffset_fsb,
1, 0, NULL, 0, &imap, &nimap, NULL);
error = xfs_bmapi_read(ip, startoffset_fsb, 1,
&imap, &nimap, 0);
if (error)
goto out_unlock_iolock;
ASSERT(nimap == 0 || nimap == 1);
@ -2116,8 +2114,8 @@ xfs_free_file_space(
startoffset_fsb += mp->m_sb.sb_rextsize - mod;
}
nimap = 1;
error = xfs_bmapi(NULL, ip, endoffset_fsb - 1,
1, 0, NULL, 0, &imap, &nimap, NULL);
error = xfs_bmapi_read(ip, endoffset_fsb - 1, 1,
&imap, &nimap, 0);
if (error)
goto out_unlock_iolock;
ASSERT(nimap == 0 || nimap == 1);