- New API: inode.[ch]::ntfs_inode_add_attrlist.
(Logical change 1.579)edge.strict_endians
(none)!yura
parent
7428b93f99
commit
64bd37518d
139
libntfs/inode.c
139
libntfs/inode.c
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@ -33,6 +33,7 @@
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#include "debug.h"
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#include "mft.h"
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#include "attrib.h"
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#include "attrlist.h"
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#include "runlist.h"
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/**
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@ -472,3 +473,141 @@ int ntfs_inode_sync(ntfs_inode *ni)
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errno = err;
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return -1;
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}
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/**
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* ntfs_inode_add_attrlist - add attribute list to inode and fill it
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* @ni - opened ntfs inode to which add attribute list
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*
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* Return 0 on success or -1 on error with errno set to the error code.
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* The following error codes are defined:
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* EINVAL - Invalid arguments were passed to the function.
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* EEXIST - Attibute list already exist.
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* EIO - Input/Ouput error occured.
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* ENOTSUP - Add requires code that has not been imlemented yet.
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* ENOMEM - Not enogh memory to perform add.
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*/
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int ntfs_inode_add_attrlist(ntfs_inode *ni)
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{
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int err;
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ntfs_attr_search_ctx *ctx;
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u8 *al, *aln;
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int al_len, al_allocated;
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ATTR_LIST_ENTRY *ale;
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if (!ni) {
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Dprintf("%s(): Invalid argumets.\n", __FUNCTION__);
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errno = EINVAL;
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return -1;
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}
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Dprintf("%s(): Entering for inode 0x%llx.\n",
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__FUNCTION__, (long long) ni->mft_no);
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if (NInoAttrList(ni) || ni->nr_extents) {
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Dprintf("%s(): Inode already has got attribute list.\n",
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__FUNCTION__);
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errno = EEXIST;
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return -1;
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}
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al_allocated = 0x40;
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al_len = 0;
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al = malloc(al_allocated);
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ale = (ATTR_LIST_ENTRY *) al;
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if (!al) {
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Dprintf("%s(): Not enough memory.\n", __FUNCTION__);
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errno = ENOMEM;
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return -1;
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}
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/* Form attribute list. */
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ctx = ntfs_attr_get_search_ctx(NULL, ni->mrec);
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if (!ctx) {
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err = errno;
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Dprintf("%s(): Coudn't get search context.\n", __FUNCTION__);
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goto err_out;
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}
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/* Walk through all attributes. */
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while (!ntfs_attr_lookup(AT_UNUSED, NULL, 0, 0, 0, NULL, 0, ctx)) {
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if (ctx->attr->type == AT_ATTRIBUTE_LIST) {
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err = EIO;
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Dprintf("%s(): Eeek! Attribute list already present.\n",
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__FUNCTION__);
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goto put_err_out;
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}
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/* Calculate new length of attribute list. */
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al_len += (sizeof(ATTR_LIST_ENTRY) + sizeof(ntfschar) *
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ctx->attr->name_length + 7) & ~7;
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/* Allocate more memory if needed. */
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while (al_len > al_allocated) {
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al_allocated += 0x40;
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aln = realloc(al, al_allocated);
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if (!aln) {
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Dprintf("%s(): Not enough memory.\n",
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__FUNCTION__);
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errno = ENOMEM;
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goto put_err_out;
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}
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ale = (ATTR_LIST_ENTRY *)(aln + ((u8 *)ale - al));
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al = aln;
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}
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/* Add attribute to attribute list. */
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ale->type = ctx->attr->type;
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ale->length = cpu_to_le16((sizeof(ATTR_LIST_ENTRY) +
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sizeof(ntfschar) * ctx->attr->name_length + 7) & ~7);
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ale->name_length = ctx->attr->name_length;
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ale->name_offset = (u8 *)ale->name - (u8 *)ale;
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if (ctx->attr->non_resident)
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ale->lowest_vcn = ctx->attr->lowest_vcn;
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else
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ale->lowest_vcn = 0;
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ale->mft_reference = MK_LE_MREF(ni->mft_no,
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le16_to_cpu(ni->mrec->sequence_number));
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ale->instance = ctx->attr->instance;
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memcpy(ale->name, (u8 *)ctx->attr +
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ctx->attr->name_offset, ctx->attr->name_length);
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ale = (ATTR_LIST_ENTRY *)(al + al_len);
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}
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/* Check for real error occured. */
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if (errno != ENOENT) {
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err = errno;
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Dprintf("%s(): Attribute lookup failed.\n", __FUNCTION__);
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goto put_err_out;
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}
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/* Deallocate trailing memory. */
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aln = realloc(al, al_len);
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if (!aln) {
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err = errno;
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Dprintf("%s(): realloc() failed.\n", __FUNCTION__);
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goto put_err_out;
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}
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al = aln;
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ntfs_attr_put_search_ctx(ctx);
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/* Add $ATTRIBUTE_LIST to mft record. */
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if (ntfs_resident_attr_record_add(ni, AT_ATTRIBUTE_LIST, 0, 0, 0) < 0) {
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err = errno;
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Dprintf("%s(): Couldn't add $ATTRIBUTE_LIST to MFT record.\n",
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__FUNCTION__);
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if (err == ENOSPC) {
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//FIXME: Move out attributes and try once again.
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err = ENOTSUP;
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}
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goto err_out;
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}
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/* Set new attribute list. */
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if (ntfs_attrlist_set(ni, al, al_len)) {
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err = errno;
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Dprintf("%s(): Coudn't set attribute list.\n", __FUNCTION__);
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goto err_out;
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}
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return 0;
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put_err_out:
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ntfs_attr_put_search_ctx(ctx);
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err_out:
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free(al);
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errno = err;
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return -1;
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}
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