c/mirror_zfs
1
0
Fork 0
mirror of https://git.proxmox.com/git/mirror_zfs.git synced 2024-12-27 03:19:35 +03:00
Code Issues Packages Projects Releases Wiki Activity

Revert "Report holes when there are only metadata changes"

Browse Source 
This reverts commit ec4f9b8f30 which introduced a narrow race which
can lead to lseek(, SEEK_DATA) incorrectly returning ENXIO.  Resolve
the issue by revering this change to restore the previous behavior
which depends solely on checking the dirty list.

Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed-by: Igor Kozhukhov <igor@dilos.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #8816 
Closes #8834
This commit is contained in:
Brian Behlendorf 2019-05-30 17:13:18 -07:00
parent 94866d8309
commit 4f8eef29e0
1 changed files with 3 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
module/zfs/dmu.c
View File

@ -2373,39 +2373,14 @@ dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, uint64_t *off)
return (err); return (err);
/* /*
* Check if there are dirty data blocks or frees which have not been * Check if dnode is dirty
* synced. Dirty spill and bonus blocks which are external to the
* object can ignored when reporting holes.
*/ */
mutex_enter(&dn->dn_mtx);
for (i = 0; i < TXG_SIZE; i++) { for (i = 0; i < TXG_SIZE; i++) {
if (multilist_link_active(&dn->dn_dirty_link[i])) { if (multilist_link_active(&dn->dn_dirty_link[i])) {
clean = B_FALSE;
if (dn->dn_free_ranges[i] != NULL) {
clean = B_FALSE;
break;
}
list_t *list = &dn->dn_dirty_records[i];
dbuf_dirty_record_t *dr;
for (dr = list_head(list); dr != NULL;
dr = list_next(list, dr)) {
dmu_buf_impl_t *db = dr->dr_dbuf;
if (db->db_blkid == DMU_SPILL_BLKID ||
db->db_blkid == DMU_BONUS_BLKID)
continue;
clean = B_FALSE;
break;
}
}
if (clean == B_FALSE)
break; break;
}
} }
mutex_exit(&dn->dn_mtx);
/* /*
* If compatibility option is on, sync any current changes before * If compatibility option is on, sync any current changes before