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Illumos 3139 - zdb dies when it tries to determine path of unlinked file

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3139 zdb dies when it tries to determine path of unlinked file
Reviewed by: Matt Ahrens <matthew.ahrens@delphix.com>
Reviewed by: Christopher Siden <chris.siden@delphix.com>
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Approved by: Dan McDonald <danmcd@nexenta.com>

References:
  https://github.com/illumos/illumos-gate/commit/1ce39b5
  https://www.illumos.org/issues/3139

Ported-by: kernelOfTruth kerneloftruth@gmail.com
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Jeremy Jones 2015-12-31 16:41:52 +01:00 committed by Brian Behlendorf
parent cfe86c01d5
commit b23ad7f350
1 changed files with 30 additions and 4 deletions
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34
module/zfs/zfs_znode.c
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@ -1820,13 +1820,16 @@ zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db, void *tag)
* or not the object is an extended attribute directory.
*/
static int
zfs_obj_to_pobj(sa_handle_t *hdl, sa_attr_type_t *sa_table, uint64_t *pobjp,
int *is_xattrdir)
zfs_obj_to_pobj(objset_t *osp, sa_handle_t *hdl, sa_attr_type_t *sa_table,
uint64_t *pobjp, int *is_xattrdir)
{
uint64_t parent;
uint64_t pflags;
uint64_t mode;
uint64_t parent_mode;
sa_bulk_attr_t bulk[3];
sa_handle_t *sa_hdl;
dmu_buf_t *sa_db;
int count = 0;
int error;
@ -1840,9 +1843,32 @@ zfs_obj_to_pobj(sa_handle_t *hdl, sa_attr_type_t *sa_table, uint64_t *pobjp,
if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0)
return (error);
*pobjp = parent;
/*
* When a link is removed its parent pointer is not changed and will
* be invalid. There are two cases where a link is removed but the
* file stays around, when it goes to the delete queue and when there
* are additional links.
*/
error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG);
if (error != 0)
return (error);
error = sa_lookup(sa_hdl, ZPL_MODE, &parent_mode, sizeof (parent_mode));
zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
if (error != 0)
return (error);
*is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode);
/*
* Extended attributes can be applied to files, directories, etc.
* Otherwise the parent must be a directory.
*/
if (!*is_xattrdir && !S_ISDIR(parent_mode))
return (EINVAL);
*pobjp = parent;
return (0);
}
@ -1891,7 +1917,7 @@ zfs_obj_to_path_impl(objset_t *osp, uint64_t obj, sa_handle_t *hdl,
if (prevdb)
zfs_release_sa_handle(prevhdl, prevdb, FTAG);
if ((error = zfs_obj_to_pobj(sa_hdl, sa_table, &pobj,
if ((error = zfs_obj_to_pobj(osp, sa_hdl, sa_table, &pobj,
&is_xattrdir)) != 0)
break;