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zfs: fix sa_modify_attrs handling of variable-sized attributes

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- skip length_idx index for a replaced variable-sized attribute
- skip length_idx index for a removed variable-sized attribute
- also re-arranged code to make sure that length_idx is always
  incremented for variable-sized attributes
- additionally add an assertion that the number of actually produced
  attributes is the same as the expected number of resulting
  attributes

In cooperation with:	Matthew Ahrens <mahrens@delphix.com>
Tested by:	Trent Nelson <trent@snakebite.org>
Reviewed by:	Matthew Ahrens <mahrens@delphix.com> (for upstream)
To do:		get this upstreamed
MFC after:	2 weeks
This commit is contained in:
Andriy Gapon 2012-09-11 07:07:52 +00:00
parent ccb92b3c78
commit 9c5c3cafbd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=240345
1 changed files with 16 additions and 9 deletions
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25
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sa.c
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@ -1604,8 +1604,11 @@ sa_replace_all_by_template(sa_handle_t *hdl, sa_bulk_attr_t *attr_desc,
}
/*
* add/remove/replace a single attribute and then rewrite the entire set
* Add/remove a single attribute or replace a variable-sized attribute value
* with a value of a different size, and then rewrite the entire set
* of attributes.
* Same-length attribute value replacement (including fixed-length attributes)
* is handled more efficiently by the upper layers.
*/
static int
sa_modify_attrs(sa_handle_t *hdl, sa_attr_type_t newattr,
@ -1687,18 +1690,19 @@ sa_modify_attrs(sa_handle_t *hdl, sa_attr_type_t newattr,
attr = idx_tab->sa_layout->lot_attrs[i];
if (attr == newattr) {
if (action == SA_REMOVE) {
j++;
continue;
/* duplicate attributes are not allowed */
ASSERT(action == SA_REPLACE ||
action == SA_REMOVE);
/* must be variable-sized to be replaced here */
if (action == SA_REPLACE) {
ASSERT(SA_REGISTERED_LEN(sa, attr) == 0);
SA_ADD_BULK_ATTR(attr_desc, j, attr,
locator, datastart, buflen);
}
ASSERT(SA_REGISTERED_LEN(sa, attr) == 0);
ASSERT(action == SA_REPLACE);
SA_ADD_BULK_ATTR(attr_desc, j, attr,
locator, datastart, buflen);
} else {
length = SA_REGISTERED_LEN(sa, attr);
if (length == 0) {
length = hdr->sa_lengths[length_idx++];
length = hdr->sa_lengths[length_idx];
}
SA_ADD_BULK_ATTR(attr_desc, j, attr,
@ -1706,6 +1710,8 @@ sa_modify_attrs(sa_handle_t *hdl, sa_attr_type_t newattr,
(TOC_OFF(idx_tab->sa_idx_tab[attr]) +
(uintptr_t)old_data[k]), length);
}
if (SA_REGISTERED_LEN(sa, attr) == 0)
length_idx++;
}
if (k == 0 && hdl->sa_spill) {
hdr = SA_GET_HDR(hdl, SA_SPILL);
@ -1723,6 +1729,7 @@ sa_modify_attrs(sa_handle_t *hdl, sa_attr_type_t newattr,
SA_ADD_BULK_ATTR(attr_desc, j, newattr, locator,
datastart, buflen);
}
ASSERT3U(j, ==, attr_count);
error = sa_build_layouts(hdl, attr_desc, attr_count, tx);