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- implement ntfs_attrlist_entry_rm 

(Logical change 1.566)
edge.strict_endians
(none)!yura 2004-09-19 14:39:47 +00:00
parent 02bda1c69a
commit 3337c4f57f
1 changed files with 83 additions and 2 deletions
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85
libntfs/attrlist.c
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@ -208,8 +208,89 @@ err_out:
*
* Return 0 on success and -1 on error with errno set to the error code.
*/
int ntfs_attrlist_entry_rm(ntfs_attr_search_ctx *ctx __attribute__((unused)))
int ntfs_attrlist_entry_rm(ntfs_attr_search_ctx *ctx)
{
errno = ENOTSUP;
u8 *new_al;
int new_al_len;
ntfs_inode *base_ni;
ntfs_attr *na;
ATTR_LIST_ENTRY *ale;
runlist *rl, *rln;
int err;
if (!ctx || !ctx->ntfs_ino || !ctx->attr || !ctx->al_entry) {
errno = EINVAL;
return -1;
}
if (ctx->base_ntfs_ino)
base_ni = ctx->base_ntfs_ino;
else
base_ni = ctx->ntfs_ino;
ale = ctx->al_entry;
Dprintf("%s(): Entering for inode 0x%llx, attr 0x%x, lowest_vcn "
"%lld.\n", __FUNCTION__, ctx->ntfs_ino->mft_no,
le32_to_cpu(ctx->attr->type),
le64_to_cpu(ctx->attr->lowest_vcn));
new_al_len = base_ni->attr_list_size - le16_to_cpu(ale->length);
new_al = malloc(new_al_len);
if (!new_al) {
Dprintf("%s(): Not enough memory.\n", __FUNCTION__);
errno = ENOMEM;
return -1;
}
memcpy(new_al, base_ni->attr_list, (u8*)ale - base_ni->attr_list);
memcpy(new_al + ((u8*)ale - base_ni->attr_list), (u8*)ale + le16_to_cpu(
ale->length), new_al_len - ((u8*)ale - base_ni->attr_list));
/* Resize $ATTRIBUTE_LIST attribute. */
na = ntfs_attr_open(base_ni, AT_ATTRIBUTE_LIST, 0, 0);
if (!na) {
err = errno;
Dprintf("%s(): Coudn't open $ATTRIBUTE_LIST.\n", __FUNCTION__);
goto err_out;
}
if (ntfs_attr_truncate(na, new_al_len)) {
err = errno;
Dprintf("%s(): $ATTRIBUTE_LIST resize failed.\n", __FUNCTION__);
goto err_out;
}
/* Update ntfs inode. */
if (NAttrNonResident(na)) {
/* Create copy of new runlist. */
if (ntfs_attr_map_whole_runlist(na)) {
Dprintf("%s(): Failed to map runlist.\n", __FUNCTION__);
if (ntfs_attr_truncate(na, base_ni->attr_list_size))
Dprintf("%s(): Rollback failed. Leaving "
"inconsist metadata.\n", __FUNCTION__);
err = EIO;
goto err_out;
}
/* Assume that runlist shoudn't grow after resize. */
for (rl = na->rl, rln = base_ni->attr_list_rl;; rl++, rln++) {
rln->vcn = rl->vcn;
rln->lcn = rl->lcn;
rln->length = rl->length;
if (!rl->length)
break;
}
NInoSetAttrListNonResident(base_ni);
} else
NInoClearAttrListNonResident(base_ni);
free(base_ni->attr_list);
base_ni->attr_list = new_al;
base_ni->attr_list_size = new_al_len;
NInoAttrListSetDirty(base_ni);
return 0;
err_out:
free(new_al);
if (na)
ntfs_attr_close(na);
errno = err;
return -1;
}