[PATCH 17/22] libxfs: update xfs_alloc to current kernel version

Dave Chinner
2013-06-12T10:37:05Z

libxfs/xfs_alloc.c | 31 +++++++++++++++++++------------
1 file changed, 19 insertions(+), 12 deletions(-)

diff --git a/libxfs/xfs_alloc.c b/libxfs/xfs_alloc.c
index 1d7ea8f..757b43d 100644
--- a/libxfs/xfs_alloc.c
+++ b/libxfs/xfs_alloc.c
@@ -153,6 +153,7 @@ xfs_alloc_compute_diff(
xfs_agblock_t wantbno, /* target starting block */
xfs_extlen_t wantlen, /* target length */
xfs_extlen_t alignment, /* target alignment */
+ char userdata, /* are we allocating data? */
xfs_agblock_t freebno, /* freespace's starting block */
xfs_extlen_t freelen, /* freespace's length */
xfs_agblock_t *newbnop) /* result: best start block from free */
@@ -167,7 +168,14 @@ xfs_alloc_compute_diff(
ASSERT(freelen >= wantlen);
freeend = freebno + freelen;
wantend = wantbno + wantlen;
- if (freebno >= wantbno) {
+ /*
+ * We want to allocate from the start of a free extent if it is past
+ * the desired block or if we are allocating user data and the free
+ * extent is before desired block. The second case is there to allow
+ * for contiguous allocation from the remaining free space if the file
+ * grows in the short term.
+ */
+ if (freebno >= wantbno || (userdata && freeend < wantend)) {
if ((newbno1 = roundup(freebno, alignment)) >= freeend)
newbno1 = NULLAGBLOCK;
} else if (freeend >= wantend && alignment > 1) {
@@ -783,7 +791,8 @@ xfs_alloc_find_best_extent(
xfs_alloc_fix_len(args);

sdiff = xfs_alloc_compute_diff(args->agbno, args->len,
- args->alignment, *sbnoa,
+ args->alignment,
+ args->userdata, *sbnoa,
*slena, &new);

/*
@@ -954,7 +963,8 @@ restart:
if (args->len < blen)
continue;
ltdiff = xfs_alloc_compute_diff(args->agbno, args->len,
- args->alignment, ltbnoa, ltlena, &ltnew);
+ args->alignment, args->userdata, ltbnoa,
+ ltlena, &ltnew);
if (ltnew != NULLAGBLOCK &&
(args->len > blen || ltdiff < bdiff)) {
bdiff = ltdiff;
@@ -1106,7 +1116,8 @@ restart:
args->len = XFS_EXTLEN_MIN(ltlena, args->maxlen);
xfs_alloc_fix_len(args);
ltdiff = xfs_alloc_compute_diff(args->agbno, args->len,
- args->alignment, ltbnoa, ltlena, &ltnew);
+ args->alignment, args->userdata, ltbnoa,
+ ltlena, &ltnew);

error = xfs_alloc_find_best_extent(args,
&bno_cur_lt, &bno_cur_gt,
@@ -1122,7 +1133,8 @@ restart:
args->len = XFS_EXTLEN_MIN(gtlena, args->maxlen);
xfs_alloc_fix_len(args);
gtdiff = xfs_alloc_compute_diff(args->agbno, args->len,
- args->alignment, gtbnoa, gtlena, &gtnew);
+ args->alignment, args->userdata, gtbnoa,
+ gtlena, &gtnew);

error = xfs_alloc_find_best_extent(args,
&bno_cur_gt, &bno_cur_lt,
@@ -1181,7 +1193,7 @@ restart:
}
rlen = args->len;
(void)xfs_alloc_compute_diff(args->agbno, rlen, args->alignment,
- ltbnoa, ltlena, &ltnew);
+ args->userdata, ltbnoa, ltlena, &ltnew);
ASSERT(ltnew >= ltbno);
ASSERT(ltnew + rlen <= ltbnoa + ltlena);
ASSERT(ltnew + rlen <= be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length));
@@ -2173,13 +2185,8 @@ xfs_agf_verify(
struct xfs_agf *agf = XFS_BUF_TO_AGF(bp);

if (xfs_sb_version_hascrc(&mp->m_sb) &&
- !uuid_equal(&agf->agf_uuid, &mp->m_sb.sb_uuid)) {
- char uu[64], uu2[64];
- platform_uuid_unparse(&agf->agf_uuid, uu);
- platform_uuid_unparse(&mp->m_sb.sb_uuid, uu2);
-
+ !uuid_equal(&agf->agf_uuid, &mp->m_sb.sb_uuid))
return false;
- }

if (!(agf->agf_magicnum == cpu_to_be32(XFS_AGF_MAGIC) &&
XFS_AGF_GOOD_VERSION(be32_to_cpu(agf->agf_versionnum)) &&