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xfs: use xfs_iext_get_extent in xfs_bmap_first_unused 

Use the bmap abstraction instead of open-coding bmbt details here.

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 2017-08-29 15:44:12 -07:00 committed by Darrick J. Wong
parent 50bb44c286
commit f2285c148c
1 changed files with 7 additions and 5 deletions
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12
fs/xfs/libxfs/xfs_bmap.c
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@ -1359,7 +1359,6 @@ xfs_bmap_first_unused(
xfs_fileoff_t lastaddr; /* last block number seen */
xfs_fileoff_t lowest; /* lowest useful block */
xfs_fileoff_t max; /* starting useful block */
xfs_fileoff_t off; /* offset for this block */
xfs_extnum_t nextents; /* number of extent entries */
ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
@ -1376,16 +1375,19 @@ xfs_bmap_first_unused(
lowest = *first_unused;
nextents = xfs_iext_count(ifp);
for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) {
xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
off = xfs_bmbt_get_startoff(ep);
struct xfs_bmbt_irec got;
xfs_iext_get_extent(ifp, idx, &got);
/*
* See if the hole before this extent will work.
*/
if (off >= lowest + len && off - max >= len) {
if (got.br_startoff >= lowest + len &&
got.br_startoff - max >= len) {
*first_unused = max;
return 0;
}
lastaddr = off + xfs_bmbt_get_blockcount(ep);
lastaddr = got.br_startoff + got.br_blockcount;
max = XFS_FILEOFF_MAX(lastaddr, lowest);
}
*first_unused = max;