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Illumos 5695 - dmu_sync'ed holes do not retain birth time

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5695 dmu_sync'ed holes do not retain birth time
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: Bayard Bell <buffer.g.overflow@gmail.com>
Approved by: Dan McDonald <danmcd@omniti.com>

References:
  https://www.illumos.org/issues/5695
  https://github.com/illumos/illumos-gate/commit/70163ac

Ported-by: Chris Dunlop <chris@onthe.net.au>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3229
This commit is contained in:
Prakash Surya 2015-03-27 13:03:22 +11:00 committed by Brian Behlendorf
parent 9540be9b23
commit a4069eef2e
3 changed files with 23 additions and 8 deletions
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4
cmd/zdb/zdb.c
View File

@ -1115,7 +1115,9 @@ snprintf_blkptr_compact(char *blkbuf, size_t buflen, const blkptr_t *bp)
if (BP_IS_HOLE(bp)) {
(void) snprintf(blkbuf + strlen(blkbuf),
buflen - strlen(blkbuf), "B=%llu",
buflen - strlen(blkbuf),
"%llxL B=%llu",
(u_longlong_t)BP_GET_LSIZE(bp),
(u_longlong_t)bp->blk_birth);
} else {
(void) snprintf(blkbuf + strlen(blkbuf),

13
include/sys/spa.h
View File

@ -501,12 +501,13 @@ _NOTE(CONSTCOND) } while (0)
if (bp == NULL) { \
len += func(buf + len, size - len, "<NULL>"); \
} else if (BP_IS_HOLE(bp)) { \
len += func(buf + len, size - len, "<hole>"); \
if (bp->blk_birth > 0) { \
len += func(buf + len, size - len, \
" birth=%lluL", \
(u_longlong_t)bp->blk_birth); \
} \
len += func(buf + len, size - len, \
"HOLE [L%llu %s] " \
"size=%llxL birth=%lluL", \
(u_longlong_t)BP_GET_LEVEL(bp), \
type, \
(u_longlong_t)BP_GET_LSIZE(bp), \
(u_longlong_t)bp->blk_birth); \
} else if (BP_IS_EMBEDDED(bp)) { \
len = func(buf + len, size - len, \
"EMBEDDED [L%llu %s] et=%u %s " \

14
module/zfs/dmu.c
View File

@ -1472,7 +1472,19 @@ dmu_sync_done(zio_t *zio, arc_buf_t *buf, void *varg)
dr->dt.dl.dr_overridden_by = *zio->io_bp;
dr->dt.dl.dr_override_state = DR_OVERRIDDEN;
dr->dt.dl.dr_copies = zio->io_prop.zp_copies;
if (BP_IS_HOLE(&dr->dt.dl.dr_overridden_by))
/*
* Old style holes are filled with all zeros, whereas
* new-style holes maintain their lsize, type, level,
* and birth time (see zio_write_compress). While we
* need to reset the BP_SET_LSIZE() call that happened
* in dmu_sync_ready for old style holes, we do *not*
* want to wipe out the information contained in new
* style holes. Thus, only zero out the block pointer if
* it's an old style hole.
*/
if (BP_IS_HOLE(&dr->dt.dl.dr_overridden_by) &&
dr->dt.dl.dr_overridden_by.blk_birth == 0)
BP_ZERO(&dr->dt.dl.dr_overridden_by);
} else {
dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN;