int
attr_sf_entry_size(
void *obj,
int startoff,
int idx)
{
xfs_attr_sf_entry_t *e;
int i;
xfs_attr_shortform_t *sf;
ASSERT(bitoffs(startoff) == 0);
sf = (xfs_attr_shortform_t *)((char *)obj + byteize(startoff));
e = &sf->list[0];
for (i = 0; i < idx; i++)
e = XFS_ATTR_SF_NEXTENTRY(e);
return bitize((int)XFS_ATTR_SF_ENTSIZE(e));
}
int
xfs_attr_sf_entsize(xfs_attr_sf_entry_t *sfep)
{
return XFS_ATTR_SF_ENTSIZE(sfep);
}
/*
* this routine validates the attributes in shortform format.
* a non-zero return repair value means certain attributes are bogus
* and were cleared if possible. Warnings do not generate error conditions
* if you cannot modify the structures. repair is set to 1, if anything
* was fixed.
*/
static int
process_shortform_attr(
struct xfs_mount *mp,
xfs_ino_t ino,
xfs_dinode_t *dip,
int *repair)
{
xfs_attr_shortform_t *asf;
xfs_attr_sf_entry_t *currententry, *nextentry, *tempentry;
int i, junkit;
int currentsize, remainingspace;
*repair = 0;
asf = (xfs_attr_shortform_t *) XFS_DFORK_APTR(dip);
/* Assumption: hdr.totsize is less than a leaf block and was checked
* by lclinode for valid sizes. Check the count though.
*/
if (asf->hdr.count == 0)
/* then the total size should just be the header length */
if (be16_to_cpu(asf->hdr.totsize) != sizeof(xfs_attr_sf_hdr_t)) {
/* whoops there's a discrepancy. Clear the hdr */
if (!no_modify) {
do_warn(
_("there are no attributes in the fork for inode %" PRIu64 "\n"),
ino);
asf->hdr.totsize =
cpu_to_be16(sizeof(xfs_attr_sf_hdr_t));
*repair = 1;
return(1);
} else {
do_warn(
_("would junk the attribute fork since count is 0 for inode %" PRIu64 "\n"),
ino);
return(1);
}
}
currentsize = sizeof(xfs_attr_sf_hdr_t);
remainingspace = be16_to_cpu(asf->hdr.totsize) - currentsize;
nextentry = &asf->list[0];
for (i = 0; i < asf->hdr.count; i++) {
currententry = nextentry;
junkit = 0;
/* don't go off the end if the hdr.count was off */
if ((currentsize + (sizeof(xfs_attr_sf_entry_t) - 1)) >
be16_to_cpu(asf->hdr.totsize))
break; /* get out and reset count and totSize */
/* if the namelen is 0, can't get to the rest of the entries */
if (currententry->namelen == 0) {
do_warn(_("zero length name entry in attribute fork,"));
if (!no_modify) {
do_warn(
_(" truncating attributes for inode %" PRIu64 " to %d\n"), ino, i);
*repair = 1;
break; /* and then update hdr fields */
} else {
do_warn(
_(" would truncate attributes for inode %" PRIu64 " to %d\n"), ino, i);
break;
}
} else {
/* It's okay to have a 0 length valuelen, but do a
* rough check to make sure we haven't gone outside of
* totsize.
*/
if (remainingspace < currententry->namelen ||
((remainingspace - currententry->
namelen) < currententry->valuelen)) {
do_warn(
_("name or value attribute lengths are too large,\n"));
if (!no_modify) {
do_warn(
_(" truncating attributes for inode %" PRIu64 " to %d\n"),
ino, i);
*repair = 1;
break; /* and then update hdr fields */
} else {
do_warn(
_(" would truncate attributes for inode %" PRIu64 " to %d\n"),
ino, i);
break;
}
}
}
/* namecheck checks for / and null terminated for file names.
* attributes names currently follow the same rules.
*/
if (namecheck((char *)¤tentry->nameval[0],
currententry->namelen)) {
do_warn(
_("entry contains illegal character in shortform attribute name\n"));
junkit = 1;
}
if (currententry->flags & XFS_ATTR_INCOMPLETE) {
do_warn(
_("entry has INCOMPLETE flag on in shortform attribute\n"));
junkit = 1;
}
/* Only check values for root security attributes */
if (currententry->flags & XFS_ATTR_ROOT)
junkit |= valuecheck(mp,
(char *)¤tentry->nameval[0],
NULL, currententry->namelen,
currententry->valuelen);
remainingspace = remainingspace -
XFS_ATTR_SF_ENTSIZE(currententry);
if (junkit) {
if (!no_modify) {
/* get rid of only this entry */
do_warn(
_("removing attribute entry %d for inode %" PRIu64 "\n"),
i, ino);
tempentry = (xfs_attr_sf_entry_t *)
((intptr_t) currententry +
XFS_ATTR_SF_ENTSIZE(currententry));
memmove(currententry,tempentry,remainingspace);
asf->hdr.count -= 1;
i--; /* no worries, it will wrap back to 0 */
*repair = 1;
continue; /* go back up now */
} else {
do_warn(
_("would remove attribute entry %d for inode %" PRIu64 "\n"),
i, ino);
}
}
/* Let's get ready for the next entry... */
nextentry = (xfs_attr_sf_entry_t *)((intptr_t) nextentry +
XFS_ATTR_SF_ENTSIZE(currententry));
currentsize = currentsize + XFS_ATTR_SF_ENTSIZE(currententry);
} /* end the loop */
if (asf->hdr.count != i) {
if (no_modify) {
do_warn(
_("would have corrected attribute entry count in inode %" PRIu64 " from %d to %d\n"),
ino, asf->hdr.count, i);
} else {
do_warn(
_("corrected attribute entry count in inode %" PRIu64 ", was %d, now %d\n"),
ino, asf->hdr.count, i);
asf->hdr.count = i;
*repair = 1;
}
}
/* ASSUMPTION: currentsize <= totsize */
if (be16_to_cpu(asf->hdr.totsize) != currentsize) {
if (no_modify) {
do_warn(
_("would have corrected attribute totsize in inode %" PRIu64 " from %d to %d\n"),
ino, be16_to_cpu(asf->hdr.totsize),
currentsize);
} else {
do_warn(
_("corrected attribute entry totsize in inode %" PRIu64 ", was %d, now %d\n"),
ino, be16_to_cpu(asf->hdr.totsize),
currentsize);
asf->hdr.totsize = cpu_to_be16(currentsize);
*repair = 1;
}
}
return(*repair);
}
