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author | avg <avg@FreeBSD.org> | 2015-05-11 09:43:03 +0000 |
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committer | avg <avg@FreeBSD.org> | 2015-05-11 09:43:03 +0000 |
commit | fa15cb3cc7c5cfe8c9e46afbc3cdf38ecece3025 (patch) | |
tree | a945dec7733b5669eb86f5dcb49946d40c488fa6 /sys/cddl | |
parent | af4d550915cff94c9d7018deaa43c001343503ea (diff) | |
download | FreeBSD-src-fa15cb3cc7c5cfe8c9e46afbc3cdf38ecece3025.zip FreeBSD-src-fa15cb3cc7c5cfe8c9e46afbc3cdf38ecece3025.tar.gz |
MFC r282131: replace a comment about zfs recv -F corner case with a longer one
Diffstat (limited to 'sys/cddl')
-rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c index f92ddd44..3383c74 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c @@ -1320,15 +1320,25 @@ zfs_rezget(znode_t *zp) } /* - * XXXPJD: Not sure how is that possible, but under heavy - * zfs recv -F load it happens that z_gen is the same, but - * vnode type is different than znode type. This would mean - * that for example regular file was replaced with directory - * which has the same object number. + * It is highly improbable but still quite possible that two + * objects in different datasets are created with the same + * object numbers and in transaction groups with the same + * numbers. znodes corresponding to those objects would + * have the same z_id and z_gen, but their other attributes + * may be different. + * zfs recv -F may replace one of such objects with the other. + * As a result file properties recorded in the replaced + * object's vnode may no longer match the received object's + * properties. At present the only cached property is the + * files type recorded in v_type. + * So, handle this case by leaving the old vnode and znode + * disassociated from the actual object. A new vnode and a + * znode will be created if the object is accessed + * (e.g. via a look-up). The old vnode and znode will be + * recycled when the last vnode reference is dropped. */ vp = ZTOV(zp); - if (vp != NULL && - vp->v_type != IFTOVT((mode_t)zp->z_mode)) { + if (vp != NULL && vp->v_type != IFTOVT((mode_t)zp->z_mode)) { zfs_znode_dmu_fini(zp); ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); return (EIO); |