--- /dev/null
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public Licens
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-
+ */
+
+#include <ext2fs.h>
+#include <linux/module.h>
+#include <linux/ext4_xattr.h>
+
+static ext4_fsblk_t ext4_new_meta_blocks(void *icb, struct inode *inode,
+ ext4_fsblk_t goal,
+ unsigned int flags,
+ unsigned long *count, int *errp)
+{
+ NTSTATUS status;
+ ULONG blockcnt = (count) ? *count : 1;
+ ULONG block = 0;
+
+ status = Ext2NewBlock((PEXT2_IRP_CONTEXT)icb,
+ inode->i_sb->s_priv,
+ 0, (ULONG)goal,
+ &block,
+ &blockcnt);
+ if (count)
+ *count = blockcnt;
+
+ if (!NT_SUCCESS(status)) {
+ *errp = Ext2LinuxError(status);
+ return 0;
+ }
+ inode->i_blocks += (blockcnt * (inode->i_sb->s_blocksize >> 9));
+ return block;
+}
+
+static void ext4_free_blocks(void *icb, struct inode *inode,
+ ext4_fsblk_t block, int count, int flags)
+{
+ Ext2FreeBlock((PEXT2_IRP_CONTEXT)icb, inode->i_sb->s_priv, (ULONG)block, count);
+ inode->i_blocks -= count * (inode->i_sb->s_blocksize >> 9);
+ return;
+}
+
+static inline ext4_fsblk_t ext4_inode_to_goal_block(struct inode *inode)
+{
+ PEXT2_VCB Vcb;
+ Vcb = inode->i_sb->s_priv;
+ return (inode->i_ino - 1) / BLOCKS_PER_GROUP;
+}
+
+#define NAME_HASH_SHIFT 5
+#define VALUE_HASH_SHIFT 16
+
+static inline void ext4_xattr_compute_hash(struct ext4_xattr_header *header,
+ struct ext4_xattr_entry *entry)
+{
+ __u32 hash = 0;
+ char *name = EXT4_XATTR_NAME(entry);
+ int n;
+
+ for (n = 0; n < entry->e_name_len; n++) {
+ hash = (hash << NAME_HASH_SHIFT) ^
+ (hash >> (8 * sizeof(hash) - NAME_HASH_SHIFT)) ^ *name++;
+ }
+
+ if (entry->e_value_block == 0 && entry->e_value_size != 0) {
+ __le32 *value =
+ (__le32 *)((char *)header + le16_to_cpu(entry->e_value_offs));
+ for (n = (le32_to_cpu(entry->e_value_size) + EXT4_XATTR_ROUND) >>
+ EXT4_XATTR_PAD_BITS;
+ n; n--) {
+ hash = (hash << VALUE_HASH_SHIFT) ^
+ (hash >> (8 * sizeof(hash) - VALUE_HASH_SHIFT)) ^
+ le32_to_cpu(*value++);
+ }
+ }
+ entry->e_hash = cpu_to_le32(hash);
+}
+
+#define BLOCK_HASH_SHIFT 16
+
+/*
+ * ext4_xattr_rehash()
+ *
+ * Re-compute the extended attribute hash value after an entry has changed.
+ */
+static void ext4_xattr_rehash(struct ext4_xattr_header *header,
+ struct ext4_xattr_entry *entry)
+{
+ struct ext4_xattr_entry *here;
+ __u32 hash = 0;
+
+ ext4_xattr_compute_hash(header, entry);
+ here = EXT4_XATTR_ENTRY(header + 1);
+ while (!EXT4_XATTR_IS_LAST_ENTRY(here)) {
+ if (!here->e_hash) {
+ /* Block is not shared if an entry's hash value == 0 */
+ hash = 0;
+ break;
+ }
+ hash = (hash << BLOCK_HASH_SHIFT) ^
+ (hash >> (8 * sizeof(hash) - BLOCK_HASH_SHIFT)) ^
+ le32_to_cpu(here->e_hash);
+ here = EXT4_XATTR_NEXT(here);
+ }
+ header->h_hash = cpu_to_le32(hash);
+}
+
+#if CONFIG_META_CSUM_ENABLE
+static __u32
+ext4_xattr_block_checksum(PEXT2_MCB inode_ref,
+ ext4_fsblk_t blocknr,
+ struct ext4_xattr_header *header)
+{
+ __u32 checksum = 0;
+ __u64 le64_blocknr = blocknr;
+ struct ext4_sblock *sb = &inode_ref->fs->sb;
+
+ if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM)) {
+ __u32 orig_checksum;
+
+ /* Preparation: temporarily set bg checksum to 0 */
+ orig_checksum = header->h_checksum;
+ header->h_checksum = 0;
+ /* First calculate crc32 checksum against fs uuid */
+ checksum = ext4_crc32c(EXT4_CRC32_INIT, sb->uuid,
+ sizeof(sb->uuid));
+ /* Then calculate crc32 checksum block number */
+ checksum = ext4_crc32c(checksum, &le64_blocknr,
+ sizeof(le64_blocknr));
+ /* Finally calculate crc32 checksum against
+ * the entire xattr block */
+ checksum = ext4_crc32c(checksum, header,
+ ext4_sb_get_block_size(sb));
+ header->h_checksum = orig_checksum;
+ }
+ return checksum;
+}
+#else
+#define ext4_xattr_block_checksum(...) 0
+#endif
+
+static void
+ext4_xattr_set_block_checksum(PEXT2_MCB inode_ref,
+ ext4_fsblk_t blocknr,
+ struct ext4_xattr_header *header)
+{
+ /* TODO: Need METADATA_CSUM supports. */
+ header->h_checksum = 0;
+}
+
+static int ext4_xattr_item_cmp(struct rb_node *_a,
+ struct rb_node *_b)
+{
+ int result;
+ struct ext4_xattr_item *a, *b;
+ a = container_of(_a, struct ext4_xattr_item, node);
+ a = container_of(_a, struct ext4_xattr_item, node);
+ b = container_of(_b, struct ext4_xattr_item, node);
+
+ if (a->is_data && !b->is_data)
+ return -1;
+
+ if (!a->is_data && b->is_data)
+ return 1;
+
+ result = a->name_index - b->name_index;
+ if (result)
+ return result;
+
+ if (a->name_len < b->name_len)
+ return -1;
+
+ if (a->name_len > b->name_len)
+ return 1;
+
+ return memcmp(a->name, b->name, a->name_len);
+}
+
+//
+// Red-black tree insert routine.
+//
+
+static struct ext4_xattr_item *
+ext4_xattr_item_search(struct ext4_xattr_ref *xattr_ref,
+ struct ext4_xattr_item *name)
+{
+ struct rb_node *new = xattr_ref->root.rb_node;
+
+ while (new) {
+ struct ext4_xattr_item *node =
+ container_of(new, struct ext4_xattr_item, node);
+ int result = ext4_xattr_item_cmp(&name->node, new);
+
+ if (result < 0)
+ new = new->rb_left;
+ else if (result > 0)
+ new = new->rb_right;
+ else
+ return node;
+
+ }
+
+ return NULL;
+}
+
+static void ext4_xattr_item_insert(struct ext4_xattr_ref *xattr_ref,
+ struct ext4_xattr_item *item)
+{
+ rb_insert(&xattr_ref->root, &item->node,
+ ext4_xattr_item_cmp);
+ list_add_tail(&item->list_node, &xattr_ref->ordered_list);
+}
+
+static void ext4_xattr_item_remove(struct ext4_xattr_ref *xattr_ref,
+ struct ext4_xattr_item *item)
+{
+ rb_erase(&item->node, &xattr_ref->root);
+ list_del_init(&item->list_node);
+}
+
+static struct ext4_xattr_item *
+ext4_xattr_item_alloc(__u8 name_index, const char *name, size_t name_len)
+{
+ struct ext4_xattr_item *item;
+ item = kzalloc(sizeof(struct ext4_xattr_item) + name_len, GFP_NOFS);
+ if (!item)
+ return NULL;
+
+ item->name_index = name_index;
+ item->name = (char *)(item + 1);
+ item->name_len = name_len;
+ item->data = NULL;
+ item->data_size = 0;
+ INIT_LIST_HEAD(&item->list_node);
+
+ memcpy(item->name, name, name_len);
+
+ if (name_index == EXT4_XATTR_INDEX_SYSTEM &&
+ name_len == 4 &&
+ !memcmp(name, "data", 4))
+ item->is_data = TRUE;
+ else
+ item->is_data = FALSE;
+
+ return item;
+}
+
+static int ext4_xattr_item_alloc_data(struct ext4_xattr_item *item,
+ const void *orig_data, size_t data_size)
+{
+ void *data = NULL;
+ ASSERT(!item->data);
+ data = kmalloc(data_size, GFP_NOFS);
+ if (!data)
+ return -ENOMEM;
+
+ if (orig_data)
+ memcpy(data, orig_data, data_size);
+
+ item->data = data;
+ item->data_size = data_size;
+ return 0;
+}
+
+static void ext4_xattr_item_free_data(struct ext4_xattr_item *item)
+{
+ ASSERT(item->data);
+ kfree(item->data);
+ item->data = NULL;
+ item->data_size = 0;
+}
+
+static int ext4_xattr_item_resize_data(struct ext4_xattr_item *item,
+ size_t new_data_size)
+{
+ if (new_data_size != item->data_size) {
+ void *new_data;
+ new_data = kmalloc(new_data_size, GFP_NOFS);
+ if (!new_data)
+ return -ENOMEM;
+
+ memcpy(new_data, item->data, item->data_size);
+ kfree(item->data);
+
+ item->data = new_data;
+ item->data_size = new_data_size;
+ }
+ return 0;
+}
+
+static void ext4_xattr_item_free(struct ext4_xattr_item *item)
+{
+ if (item->data)
+ ext4_xattr_item_free_data(item);
+
+ kfree(item);
+}
+
+static void *ext4_xattr_entry_data(struct ext4_xattr_ref *xattr_ref,
+ struct ext4_xattr_entry *entry,
+ BOOL in_inode)
+{
+ char *ret;
+ int block_size;
+ if (in_inode) {
+ struct ext4_xattr_ibody_header *header;
+ struct ext4_xattr_entry *first_entry;
+ int inode_size = xattr_ref->fs->InodeSize;
+ header = EXT4_XATTR_IHDR(xattr_ref->OnDiskInode);
+ first_entry = EXT4_XATTR_IFIRST(header);
+
+ ret = ((char *)first_entry + le16_to_cpu(entry->e_value_offs));
+ if (ret + EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) -
+ (char *)xattr_ref->OnDiskInode > inode_size)
+ ret = NULL;
+
+ return ret;
+
+ }
+ block_size = xattr_ref->fs->BlockSize;
+ ret = ((char *)xattr_ref->block_bh->b_data + le16_to_cpu(entry->e_value_offs));
+ if (ret + EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) -
+ (char *)xattr_ref->block_bh->b_data > block_size)
+ ret = NULL;
+ return ret;
+}
+
+static int ext4_xattr_block_fetch(struct ext4_xattr_ref *xattr_ref)
+{
+ int ret = 0;
+ size_t size_rem;
+ void *data;
+ struct ext4_xattr_entry *entry = NULL;
+
+ ASSERT(xattr_ref->block_bh->b_data);
+ entry = EXT4_XATTR_BFIRST(xattr_ref->block_bh);
+
+ size_rem = xattr_ref->fs->BlockSize;
+ for (; size_rem > 0 && !EXT4_XATTR_IS_LAST_ENTRY(entry);
+ entry = EXT4_XATTR_NEXT(entry),
+ size_rem -= EXT4_XATTR_LEN(entry->e_name_len)) {
+ struct ext4_xattr_item *item;
+ char *e_name = EXT4_XATTR_NAME(entry);
+
+ data = ext4_xattr_entry_data(xattr_ref, entry, FALSE);
+ if (!data) {
+ ret = -EIO;
+ goto Finish;
+ }
+
+ item = ext4_xattr_item_alloc(entry->e_name_index, e_name,
+ (size_t)entry->e_name_len);
+ if (!item) {
+ ret = -ENOMEM;
+ goto Finish;
+ }
+ if (ext4_xattr_item_alloc_data(
+ item, data, le32_to_cpu(entry->e_value_size)) != 0) {
+ ext4_xattr_item_free(item);
+ ret = -ENOMEM;
+ goto Finish;
+ }
+ ext4_xattr_item_insert(xattr_ref, item);
+ xattr_ref->block_size_rem -=
+ EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ xattr_ref->ea_size += EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ }
+
+Finish:
+ return ret;
+}
+
+static int ext4_xattr_inode_fetch(struct ext4_xattr_ref *xattr_ref)
+{
+ void *data;
+ size_t size_rem;
+ int ret = 0;
+ struct ext4_xattr_ibody_header *header = NULL;
+ struct ext4_xattr_entry *entry = NULL;
+ int inode_size = xattr_ref->fs->InodeSize;
+
+ header = EXT4_XATTR_IHDR(xattr_ref->OnDiskInode);
+ entry = EXT4_XATTR_IFIRST(header);
+
+ size_rem = inode_size - EXT4_GOOD_OLD_INODE_SIZE -
+ xattr_ref->OnDiskInode->i_extra_isize;
+ for (; size_rem > 0 && !EXT4_XATTR_IS_LAST_ENTRY(entry);
+ entry = EXT4_XATTR_NEXT(entry),
+ size_rem -= EXT4_XATTR_LEN(entry->e_name_len)) {
+ struct ext4_xattr_item *item;
+ char *e_name = EXT4_XATTR_NAME(entry);
+
+ data = ext4_xattr_entry_data(xattr_ref, entry, TRUE);
+ if (!data) {
+ ret = -EIO;
+ goto Finish;
+ }
+
+ item = ext4_xattr_item_alloc(entry->e_name_index, e_name,
+ (size_t)entry->e_name_len);
+ if (!item) {
+ ret = -ENOMEM;
+ goto Finish;
+ }
+ if (ext4_xattr_item_alloc_data(
+ item, data, le32_to_cpu(entry->e_value_size)) != 0) {
+ ext4_xattr_item_free(item);
+ ret = -ENOMEM;
+ goto Finish;
+ }
+ item->in_inode = TRUE;
+ ext4_xattr_item_insert(xattr_ref, item);
+ xattr_ref->inode_size_rem -=
+ EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ xattr_ref->ea_size += EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ }
+
+Finish:
+ return ret;
+}
+
+static __s32 ext4_xattr_inode_space(struct ext4_xattr_ref *xattr_ref)
+{
+ int inode_size = xattr_ref->fs->InodeSize;
+ int size_rem = inode_size - EXT4_GOOD_OLD_INODE_SIZE -
+ xattr_ref->OnDiskInode->i_extra_isize;
+ return size_rem;
+}
+
+static __s32 ext4_xattr_block_space(struct ext4_xattr_ref *xattr_ref)
+{
+ return xattr_ref->fs->BlockSize;
+}
+
+static int ext4_xattr_fetch(struct ext4_xattr_ref *xattr_ref)
+{
+ int ret = 0;
+ int inode_size = xattr_ref->fs->InodeSize;
+ if (inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
+ ret = ext4_xattr_inode_fetch(xattr_ref);
+ if (ret != 0)
+ return ret;
+ }
+
+ if (xattr_ref->block_loaded)
+ ret = ext4_xattr_block_fetch(xattr_ref);
+
+ xattr_ref->dirty = FALSE;
+ return ret;
+}
+
+static struct ext4_xattr_item *
+ext4_xattr_lookup_item(struct ext4_xattr_ref *xattr_ref, __u8 name_index,
+ const char *name, size_t name_len)
+{
+ struct ext4_xattr_item tmp = {
+ FALSE,
+ FALSE,
+ name_index,
+ (char *)name, /*won't touch this string*/
+ name_len,
+ };
+ if (name_index == EXT4_XATTR_INDEX_SYSTEM &&
+ name_len == 4 &&
+ !memcmp(name, "data", 4))
+ tmp.is_data = TRUE;
+
+ return ext4_xattr_item_search(xattr_ref, &tmp);
+}
+
+static struct ext4_xattr_item *
+ext4_xattr_insert_item(struct ext4_xattr_ref *xattr_ref, __u8 name_index,
+ const char *name, size_t name_len, const void *data,
+ size_t data_size,
+ int *err)
+{
+ struct ext4_xattr_item *item;
+ item = ext4_xattr_item_alloc(name_index, name, name_len);
+ if (!item) {
+ if (err)
+ *err = -ENOMEM;
+
+ return NULL;
+ }
+
+ item->in_inode = TRUE;
+ if (xattr_ref->inode_size_rem <
+ EXT4_XATTR_SIZE(data_size) +
+ EXT4_XATTR_LEN(item->name_len)) {
+ if (xattr_ref->block_size_rem <
+ EXT4_XATTR_SIZE(data_size) +
+ EXT4_XATTR_LEN(item->name_len)) {
+ if (err)
+ *err = -ENOSPC;
+
+ return NULL;
+ }
+
+ item->in_inode = FALSE;
+ }
+ if (ext4_xattr_item_alloc_data(item, data, data_size) != 0) {
+ ext4_xattr_item_free(item);
+ if (err)
+ *err = -ENOMEM;
+
+ return NULL;
+ }
+ ext4_xattr_item_insert(xattr_ref, item);
+ xattr_ref->ea_size +=
+ EXT4_XATTR_SIZE(item->data_size) + EXT4_XATTR_LEN(item->name_len);
+ if (item->in_inode) {
+ xattr_ref->inode_size_rem -=
+ EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ } else {
+ xattr_ref->block_size_rem -=
+ EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ }
+ xattr_ref->dirty = TRUE;
+ if (err)
+ *err = 0;
+
+ return item;
+}
+
+static struct ext4_xattr_item *
+ext4_xattr_insert_item_ordered(struct ext4_xattr_ref *xattr_ref, __u8 name_index,
+ const char *name, size_t name_len, const void *data,
+ size_t data_size,
+ int *err)
+{
+ struct ext4_xattr_item *item, *last_item = NULL;
+ item = ext4_xattr_item_alloc(name_index, name, name_len);
+ if (!item) {
+ if (err)
+ *err = -ENOMEM;
+
+ return NULL;
+ }
+
+ if (!list_empty(&xattr_ref->ordered_list))
+ last_item = list_entry(xattr_ref->ordered_list.prev,
+ struct ext4_xattr_item,
+ list_node);
+
+ item->in_inode = TRUE;
+ if ((xattr_ref->inode_size_rem <
+ EXT4_XATTR_SIZE(data_size) +
+ EXT4_XATTR_LEN(item->name_len))
+ ||
+ (last_item && !last_item->in_inode)) {
+ if (xattr_ref->block_size_rem <
+ EXT4_XATTR_SIZE(data_size) +
+ EXT4_XATTR_LEN(item->name_len)) {
+ if (err)
+ *err = -ENOSPC;
+
+ return NULL;
+ }
+
+ item->in_inode = FALSE;
+ }
+ if (ext4_xattr_item_alloc_data(item, data, data_size) != 0) {
+ ext4_xattr_item_free(item);
+ if (err)
+ *err = -ENOMEM;
+
+ return NULL;
+ }
+ ext4_xattr_item_insert(xattr_ref, item);
+ xattr_ref->ea_size +=
+ EXT4_XATTR_SIZE(item->data_size) + EXT4_XATTR_LEN(item->name_len);
+ if (item->in_inode) {
+ xattr_ref->inode_size_rem -=
+ EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ }
+ else {
+ xattr_ref->block_size_rem -=
+ EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ }
+ xattr_ref->dirty = TRUE;
+ if (err)
+ *err = 0;
+
+ return item;
+}
+
+static int ext4_xattr_remove_item(struct ext4_xattr_ref *xattr_ref,
+ __u8 name_index, const char *name,
+ size_t name_len)
+{
+ int ret = -ENOENT;
+ struct ext4_xattr_item *item =
+ ext4_xattr_lookup_item(xattr_ref, name_index, name, name_len);
+ if (item) {
+ if (item == xattr_ref->iter_from) {
+ struct rb_node *next_node;
+ next_node = rb_next(&item->node);
+ if (next_node)
+ xattr_ref->iter_from =
+ container_of(next_node,
+ struct ext4_xattr_item,
+ node);
+ else
+ xattr_ref->iter_from = NULL;
+ }
+
+ xattr_ref->ea_size -= EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+
+ if (item->in_inode) {
+ xattr_ref->inode_size_rem +=
+ EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ } else {
+ xattr_ref->block_size_rem +=
+ EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ }
+
+ ext4_xattr_item_remove(xattr_ref, item);
+ ext4_xattr_item_free(item);
+ xattr_ref->dirty = TRUE;
+ ret = 0;
+ }
+ return ret;
+}
+
+static int ext4_xattr_resize_item(struct ext4_xattr_ref *xattr_ref,
+ struct ext4_xattr_item *item,
+ size_t new_data_size)
+{
+ int ret = 0;
+ BOOL to_inode = FALSE, to_block = FALSE;
+ size_t old_data_size = item->data_size;
+ size_t orig_room_size = item->in_inode ?
+ xattr_ref->inode_size_rem :
+ xattr_ref->block_size_rem;
+
+ /*
+ * Check if we can hold this entry in both in-inode and
+ * on-block form
+ *
+ * More complicated case: we do not allow entries stucking in
+ * the middle between in-inode space and on-block space, so
+ * the entry has to stay in either inode space or block space.
+ */
+ if (item->in_inode) {
+ if (xattr_ref->inode_size_rem +
+ EXT4_XATTR_SIZE(old_data_size) <
+ EXT4_XATTR_SIZE(new_data_size)) {
+ if (xattr_ref->block_size_rem <
+ EXT4_XATTR_SIZE(new_data_size) +
+ EXT4_XATTR_LEN(item->name_len))
+ return -ENOSPC;
+
+ to_block = TRUE;
+ }
+ } else {
+ if (xattr_ref->block_size_rem +
+ EXT4_XATTR_SIZE(old_data_size) <
+ EXT4_XATTR_SIZE(new_data_size)) {
+ if (xattr_ref->inode_size_rem <
+ EXT4_XATTR_SIZE(new_data_size) +
+ EXT4_XATTR_LEN(item->name_len))
+ return -ENOSPC;
+
+ to_inode = TRUE;
+ }
+ }
+ ret = ext4_xattr_item_resize_data(item, new_data_size);
+ if (ret)
+ return ret;
+
+ xattr_ref->ea_size =
+ xattr_ref->ea_size -
+ EXT4_XATTR_SIZE(old_data_size) +
+ EXT4_XATTR_SIZE(new_data_size);
+
+ /*
+ * This entry may originally lie in inode space or block space,
+ * and it is going to be transferred to another place.
+ */
+ if (to_block) {
+ xattr_ref->inode_size_rem +=
+ EXT4_XATTR_SIZE(old_data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ xattr_ref->block_size_rem -=
+ EXT4_XATTR_SIZE(new_data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ item->in_inode = FALSE;
+ } else if (to_inode) {
+ xattr_ref->block_size_rem +=
+ EXT4_XATTR_SIZE(old_data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ xattr_ref->inode_size_rem -=
+ EXT4_XATTR_SIZE(new_data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ item->in_inode = TRUE;
+ } else {
+ /*
+ * No need to transfer as there is enough space for the entry
+ * to stay in inode space or block space it used to be.
+ */
+ orig_room_size +=
+ EXT4_XATTR_SIZE(old_data_size);
+ orig_room_size -=
+ EXT4_XATTR_SIZE(new_data_size);
+ if (item->in_inode)
+ xattr_ref->inode_size_rem = orig_room_size;
+ else
+ xattr_ref->block_size_rem = orig_room_size;
+
+ }
+ xattr_ref->dirty = TRUE;
+ return ret;
+}
+
+void ext4_xattr_purge_items(struct ext4_xattr_ref *xattr_ref)
+{
+ struct rb_node *first_node;
+ struct ext4_xattr_item *item = NULL;
+ first_node = rb_first(&xattr_ref->root);
+ if (first_node)
+ item = container_of(first_node, struct ext4_xattr_item,
+ node);
+
+ while (item) {
+ struct rb_node *next_node;
+ struct ext4_xattr_item *next_item = NULL;
+ next_node = rb_next(&item->node);
+ if (next_node)
+ next_item = container_of(next_node, struct ext4_xattr_item,
+ node);
+ else
+ next_item = NULL;
+
+ ext4_xattr_item_remove(xattr_ref, item);
+ ext4_xattr_item_free(item);
+
+ item = next_item;
+ }
+ xattr_ref->ea_size = 0;
+ if (ext4_xattr_inode_space(xattr_ref) <
+ sizeof(struct ext4_xattr_ibody_header))
+ xattr_ref->inode_size_rem = 0;
+ else
+ xattr_ref->inode_size_rem =
+ ext4_xattr_inode_space(xattr_ref) -
+ sizeof(struct ext4_xattr_ibody_header);
+
+ xattr_ref->block_size_rem =
+ ext4_xattr_block_space(xattr_ref) -
+ sizeof(struct ext4_xattr_header);
+}
+
+static int ext4_xattr_try_alloc_block(struct ext4_xattr_ref *xattr_ref)
+{
+ int ret = 0;
+
+ ext4_fsblk_t xattr_block = 0;
+ xattr_block = xattr_ref->inode_ref->Inode.i_file_acl;
+ if (!xattr_block) {
+ ext4_fsblk_t goal =
+ ext4_inode_to_goal_block(&xattr_ref->inode_ref->Inode);
+
+ xattr_block = ext4_new_meta_blocks(xattr_ref->IrpContext,
+ &xattr_ref->inode_ref->Inode,
+ goal, 0, NULL,
+ &ret);
+ if (ret != 0)
+ goto Finish;
+
+ xattr_ref->block_bh = extents_bwrite(&xattr_ref->fs->sb, xattr_block);
+ if (!xattr_ref->block_bh) {
+ ext4_free_blocks(xattr_ref->IrpContext, &xattr_ref->inode_ref->Inode,
+ xattr_block, 1, 0);
+ ret = -ENOMEM;
+ goto Finish;
+ }
+
+ xattr_ref->inode_ref->Inode.i_file_acl = xattr_block;
+ xattr_ref->IsOnDiskInodeDirty = TRUE;
+ xattr_ref->block_loaded = TRUE;
+ }
+
+Finish:
+ return ret;
+}
+
+static void ext4_xattr_try_free_block(struct ext4_xattr_ref *xattr_ref)
+{
+ ext4_fsblk_t xattr_block;
+ xattr_block = xattr_ref->inode_ref->Inode.i_file_acl;
+ xattr_ref->inode_ref->Inode.i_file_acl = 0;
+ extents_brelse(xattr_ref->block_bh);
+ xattr_ref->block_bh = NULL;
+ ext4_free_blocks(xattr_ref->IrpContext, &xattr_ref->inode_ref->Inode,
+ xattr_block, 1, 0);
+ xattr_ref->IsOnDiskInodeDirty = TRUE;
+ xattr_ref->block_loaded = FALSE;
+}
+
+static void ext4_xattr_set_block_header(struct ext4_xattr_ref *xattr_ref)
+{
+ struct ext4_xattr_header *block_header = NULL;
+ block_header = EXT4_XATTR_BHDR(xattr_ref->block_bh);
+
+ memset(block_header, 0, sizeof(struct ext4_xattr_header));
+ block_header->h_magic = EXT4_XATTR_MAGIC;
+ block_header->h_refcount = cpu_to_le32(1);
+ block_header->h_blocks = cpu_to_le32(1);
+}
+
+static void
+ext4_xattr_set_inode_entry(struct ext4_xattr_item *item,
+ struct ext4_xattr_ibody_header *ibody_header,
+ struct ext4_xattr_entry *entry, void *ibody_data_ptr)
+{
+ entry->e_name_len = (__u8)item->name_len;
+ entry->e_name_index = item->name_index;
+ entry->e_value_offs =
+ cpu_to_le16((char *)ibody_data_ptr - (char *)EXT4_XATTR_IFIRST(ibody_header));
+ entry->e_value_block = 0;
+ entry->e_value_size = cpu_to_le32(item->data_size);
+}
+
+static void ext4_xattr_set_block_entry(struct ext4_xattr_item *item,
+ struct ext4_xattr_header *block_header,
+ struct ext4_xattr_entry *block_entry,
+ void *block_data_ptr)
+{
+ block_entry->e_name_len = (__u8)item->name_len;
+ block_entry->e_name_index = item->name_index;
+ block_entry->e_value_offs =
+ cpu_to_le16((char *)block_data_ptr - (char *)block_header);
+ block_entry->e_value_block = 0;
+ block_entry->e_value_size = cpu_to_le32(item->data_size);
+}
+
+static int ext4_xattr_write_to_disk(struct ext4_xattr_ref *xattr_ref)
+{
+ int ret = 0;
+ BOOL block_modified = FALSE;
+ void *ibody_data = NULL;
+ void *block_data = NULL;
+ size_t inode_size_rem, block_size_rem;
+ struct ext4_xattr_ibody_header *ibody_header = NULL;
+ struct ext4_xattr_header *block_header = NULL;
+ struct ext4_xattr_entry *entry = NULL;
+ struct ext4_xattr_entry *block_entry = NULL;
+ struct ext4_xattr_item *item = NULL;
+
+ inode_size_rem = ext4_xattr_inode_space(xattr_ref);
+ block_size_rem = ext4_xattr_block_space(xattr_ref);
+ if (inode_size_rem > sizeof(struct ext4_xattr_ibody_header)) {
+ ibody_header = EXT4_XATTR_IHDR(xattr_ref->OnDiskInode);
+ entry = EXT4_XATTR_IFIRST(ibody_header);
+ }
+
+ if (!xattr_ref->dirty)
+ goto Finish;
+ /* If there are enough spaces in the ibody EA table.*/
+ if (inode_size_rem > sizeof(struct ext4_xattr_ibody_header)) {
+ memset(ibody_header, 0, inode_size_rem);
+ ibody_header->h_magic = EXT4_XATTR_MAGIC;
+ ibody_data = (char *)ibody_header + inode_size_rem;
+ inode_size_rem -= sizeof(struct ext4_xattr_ibody_header);
+
+ xattr_ref->IsOnDiskInodeDirty = TRUE;
+ }
+ /* If we need an extra block to hold the EA entries*/
+ if (xattr_ref->ea_size > inode_size_rem) {
+ if (!xattr_ref->block_loaded) {
+ ret = ext4_xattr_try_alloc_block(xattr_ref);
+ if (ret != 0)
+ goto Finish;
+ }
+ memset(xattr_ref->block_bh->b_data, 0, xattr_ref->fs->BlockSize);
+ block_header = EXT4_XATTR_BHDR(xattr_ref->block_bh);
+ block_entry = EXT4_XATTR_BFIRST(xattr_ref->block_bh);
+ ext4_xattr_set_block_header(xattr_ref);
+ block_data = (char *)block_header + block_size_rem;
+ block_size_rem -= sizeof(struct ext4_xattr_header);
+
+ extents_mark_buffer_dirty(xattr_ref->block_bh);
+ } else {
+ /* We don't need an extra block.*/
+ if (xattr_ref->block_loaded) {
+ block_header = EXT4_XATTR_BHDR(xattr_ref->block_bh);
+ le32_add_cpu(&block_header->h_refcount, -1);
+ if (!block_header->h_refcount) {
+ ext4_xattr_try_free_block(xattr_ref);
+ block_header = NULL;
+ } else {
+ block_entry =
+ EXT4_XATTR_BFIRST(xattr_ref->block_bh);
+ block_data =
+ (char *)block_header + block_size_rem;
+ block_size_rem -=
+ sizeof(struct ext4_xattr_header);
+ xattr_ref->inode_ref->Inode.i_file_acl = 0;
+
+ xattr_ref->IsOnDiskInodeDirty = TRUE;
+ extents_mark_buffer_dirty(xattr_ref->block_bh);
+ }
+ }
+ }
+
+ list_for_each_entry(item, &xattr_ref->ordered_list, struct ext4_xattr_item, list_node) {
+ if (item->in_inode) {
+ ibody_data = (char *)ibody_data -
+ EXT4_XATTR_SIZE(item->data_size);
+ ext4_xattr_set_inode_entry(item, ibody_header, entry,
+ ibody_data);
+ memcpy(EXT4_XATTR_NAME(entry), item->name,
+ item->name_len);
+ memcpy(ibody_data, item->data, item->data_size);
+ entry = EXT4_XATTR_NEXT(entry);
+ inode_size_rem -= EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+
+ xattr_ref->IsOnDiskInodeDirty = TRUE;
+ continue;
+ }
+ if (EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len) >
+ block_size_rem) {
+ ret = -ENOSPC;
+ DbgPrint("ext4_xattr.c: IMPOSSIBLE -ENOSPC AS WE DID INSPECTION!\n");
+ ASSERT(0);
+ }
+ block_data =
+ (char *)block_data - EXT4_XATTR_SIZE(item->data_size);
+ ext4_xattr_set_block_entry(item, block_header, block_entry,
+ block_data);
+ memcpy(EXT4_XATTR_NAME(block_entry), item->name,
+ item->name_len);
+ memcpy(block_data, item->data, item->data_size);
+ ext4_xattr_compute_hash(block_header, block_entry);
+ block_entry = EXT4_XATTR_NEXT(block_entry);
+ block_size_rem -= EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+
+ block_modified = TRUE;
+ }
+ xattr_ref->dirty = FALSE;
+ if (block_modified) {
+ ext4_xattr_rehash(block_header,
+ EXT4_XATTR_BFIRST(xattr_ref->block_bh));
+ ext4_xattr_set_block_checksum(xattr_ref->inode_ref,
+ xattr_ref->block_bh->b_blocknr,
+ block_header);
+ extents_mark_buffer_dirty(xattr_ref->block_bh);
+ }
+
+Finish:
+ return ret;
+}
+
+void ext4_fs_xattr_iterate(struct ext4_xattr_ref *ref,
+ int (*iter)(struct ext4_xattr_ref *ref,
+ struct ext4_xattr_item *item,
+ BOOL is_last))
+{
+ struct ext4_xattr_item *item;
+ if (!ref->iter_from) {
+ struct list_head *first_node;
+ first_node = ref->ordered_list.next;
+ if (first_node && first_node != &ref->ordered_list) {
+ ref->iter_from =
+ list_entry(first_node,
+ struct ext4_xattr_item,
+ list_node);
+ }
+ }
+
+ item = ref->iter_from;
+ while (item) {
+ struct list_head *next_node;
+ struct ext4_xattr_item *next_item;
+ int ret = EXT4_XATTR_ITERATE_CONT;
+ next_node = item->list_node.next;
+ if (next_node && next_node != &ref->ordered_list)
+ next_item = list_entry(next_node, struct ext4_xattr_item,
+ list_node);
+ else
+ next_item = NULL;
+ if (iter)
+ ret = iter(ref, item, !next_item);
+
+ if (ret != EXT4_XATTR_ITERATE_CONT) {
+ if (ret == EXT4_XATTR_ITERATE_STOP)
+ ref->iter_from = NULL;
+
+ break;
+ }
+ item = next_item;
+ }
+}
+
+void ext4_fs_xattr_iterate_reset(struct ext4_xattr_ref *ref)
+{
+ ref->iter_from = NULL;
+}
+
+int ext4_fs_set_xattr(struct ext4_xattr_ref *ref, __u8 name_index,
+ const char *name, size_t name_len, const void *data,
+ size_t data_size, BOOL replace)
+{
+ int ret = 0;
+ struct ext4_xattr_item *item =
+ ext4_xattr_lookup_item(ref, name_index, name, name_len);
+ if (replace) {
+ if (!item) {
+ ret = -ENODATA;
+ goto Finish;
+ }
+ if (item->data_size != data_size)
+ ret = ext4_xattr_resize_item(ref, item, data_size);
+
+ if (ret != 0) {
+ goto Finish;
+ }
+ memcpy(item->data, data, data_size);
+ } else {
+ if (item) {
+ ret = -EEXIST;
+ goto Finish;
+ }
+ item = ext4_xattr_insert_item(ref, name_index, name, name_len,
+ data, data_size, &ret);
+ }
+Finish:
+ return ret;
+}
+
+int ext4_fs_set_xattr_ordered(struct ext4_xattr_ref *ref, __u8 name_index,
+ const char *name, size_t name_len, const void *data,
+ size_t data_size)
+{
+ int ret = 0;
+ struct ext4_xattr_item *item =
+ ext4_xattr_lookup_item(ref, name_index, name, name_len);
+ if (item) {
+ ret = -EEXIST;
+ goto Finish;
+ }
+ item = ext4_xattr_insert_item_ordered(ref, name_index, name, name_len,
+ data, data_size, &ret);
+Finish:
+ return ret;
+}
+
+int ext4_fs_remove_xattr(struct ext4_xattr_ref *ref, __u8 name_index,
+ const char *name, size_t name_len)
+{
+ return ext4_xattr_remove_item(ref, name_index, name, name_len);
+}
+
+int ext4_fs_get_xattr(struct ext4_xattr_ref *ref, __u8 name_index,
+ const char *name, size_t name_len, void *buf,
+ size_t buf_size, size_t *data_size)
+{
+ int ret = 0;
+ size_t item_size = 0;
+ struct ext4_xattr_item *item =
+ ext4_xattr_lookup_item(ref, name_index, name, name_len);
+
+ if (!item) {
+ ret = -ENODATA;
+ goto Finish;
+ }
+ item_size = item->data_size;
+ if (buf_size > item_size)
+ buf_size = item_size;
+
+ if (buf)
+ memcpy(buf, item->data, buf_size);
+
+Finish:
+ if (data_size)
+ *data_size = item_size;
+
+ return ret;
+}
+
+int ext4_fs_get_xattr_ref(PEXT2_IRP_CONTEXT IrpContext, PEXT2_VCB fs, PEXT2_MCB inode_ref,
+ struct ext4_xattr_ref *ref)
+{
+ int rc;
+ ext4_fsblk_t xattr_block;
+ xattr_block = inode_ref->Inode.i_file_acl;
+ memset(&ref->root, 0, sizeof(struct rb_root));
+ ref->ea_size = 0;
+ ref->iter_from = NULL;
+ if (xattr_block) {
+ ref->block_bh = extents_bread(&fs->sb, xattr_block);
+ if (!ref->block_bh)
+ return -EIO;
+
+ ref->block_loaded = TRUE;
+ } else
+ ref->block_loaded = FALSE;
+
+ ref->inode_ref = inode_ref;
+ ref->fs = fs;
+ INIT_LIST_HEAD(&ref->ordered_list);
+
+ ref->OnDiskInode = Ext2AllocateInode(fs);
+ if (!ref->OnDiskInode) {
+ if (xattr_block) {
+ extents_brelse(ref->block_bh);
+ ref->block_bh = NULL;
+ }
+ return -ENOMEM;
+ }
+ if (!Ext2LoadInodeXattr(fs, &inode_ref->Inode, ref->OnDiskInode)) {
+ if (xattr_block) {
+ extents_brelse(ref->block_bh);
+ ref->block_bh = NULL;
+ }
+
+ Ext2DestroyInode(fs, ref->OnDiskInode);
+ return -EIO;
+ }
+ ref->IsOnDiskInodeDirty = FALSE;
+
+ if (ext4_xattr_inode_space(ref) <
+ sizeof(struct ext4_xattr_ibody_header) +
+ sizeof(__u32))
+ ref->inode_size_rem = 0;
+ else {
+ ref->inode_size_rem =
+ ext4_xattr_inode_space(ref) -
+ sizeof(struct ext4_xattr_ibody_header);
+ }
+
+ ref->block_size_rem =
+ ext4_xattr_block_space(ref) -
+ sizeof(struct ext4_xattr_header) -
+ sizeof(__u32);
+
+ rc = ext4_xattr_fetch(ref);
+ if (rc != 0) {
+ ext4_xattr_purge_items(ref);
+ if (xattr_block) {
+ extents_brelse(ref->block_bh);
+ ref->block_bh = NULL;
+ }
+
+ Ext2DestroyInode(fs, ref->OnDiskInode);
+ return rc;
+ }
+ ref->IrpContext = IrpContext;
+ return 0;
+}
+
+int ext4_fs_put_xattr_ref(struct ext4_xattr_ref *ref)
+{
+ int ret;
+ sector_t orig_file_acl = ref->inode_ref->Inode.i_file_acl;
+ ret = ext4_xattr_write_to_disk(ref);
+ if (ref->IsOnDiskInodeDirty) {
+ ASSERT(ref->fs->InodeSize > EXT4_GOOD_OLD_INODE_SIZE);
+
+ /* As we may do block allocation in ext4_xattr_write_to_disk */
+ if (ret)
+ ref->inode_ref->Inode.i_file_acl = orig_file_acl;
+
+ if (!ret) {
+ ret = Ext2SaveInode(ref->IrpContext, ref->fs, &ref->inode_ref->Inode)
+ ? 0 : -EIO;
+ if (!ret) {
+ ret = Ext2SaveInodeXattr(ref->IrpContext,
+ ref->fs,
+ &ref->inode_ref->Inode,
+ ref->OnDiskInode)
+ ? 0 : -EIO;
+ }
+ }
+ ref->IsOnDiskInodeDirty = FALSE;
+ }
+ if (ref->block_loaded) {
+ if (!ret)
+ extents_brelse(ref->block_bh);
+ else
+ extents_bforget(ref->block_bh);
+
+ ref->block_bh = NULL;
+ ref->block_loaded = FALSE;
+ }
+ ext4_xattr_purge_items(ref);
+ Ext2DestroyInode(ref->fs, ref->OnDiskInode);
+ ref->OnDiskInode = NULL;
+ ref->inode_ref = NULL;
+ ref->fs = NULL;
+ return ret;
+}
+
+struct xattr_prefix {
+ const char *prefix;
+ __u8 name_index;
+};
+
+static const struct xattr_prefix prefix_tbl[] = {
+ {"user.", EXT4_XATTR_INDEX_USER},
+ {"system.posix_acl_access", EXT4_XATTR_INDEX_POSIX_ACL_ACCESS},
+ {"system.posix_acl_default", EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT},
+ {"trusted.", EXT4_XATTR_INDEX_TRUSTED},
+ {"security.", EXT4_XATTR_INDEX_SECURITY},
+ {"system.", EXT4_XATTR_INDEX_SYSTEM},
+ {"system.richacl", EXT4_XATTR_INDEX_RICHACL},
+ {NULL, 0},
+};
+
+const char *ext4_extract_xattr_name(const char *full_name, size_t full_name_len,
+ __u8 *name_index, size_t *name_len,
+ BOOL *found)
+{
+ int i;
+ ASSERT(name_index);
+ ASSERT(found);
+
+ *found = FALSE;
+
+ if (!full_name_len) {
+ if (name_len)
+ *name_len = 0;
+
+ return NULL;
+ }
+
+ for (i = 0; prefix_tbl[i].prefix; i++) {
+ size_t prefix_len = strlen(prefix_tbl[i].prefix);
+ if (full_name_len >= prefix_len &&
+ !memcmp(full_name, prefix_tbl[i].prefix, prefix_len)) {
+ BOOL require_name =
+ prefix_tbl[i].prefix[prefix_len - 1] == '.';
+ *name_index = prefix_tbl[i].name_index;
+ if (name_len)
+ *name_len = full_name_len - prefix_len;
+
+ if (!(full_name_len - prefix_len) && require_name)
+ return NULL;
+
+ *found = TRUE;
+ if (require_name)
+ return full_name + prefix_len;
+
+ return NULL;
+ }
+ }
+ if (name_len)
+ *name_len = 0;
+
+ return NULL;
+}
+
+const char *ext4_get_xattr_name_prefix(__u8 name_index,
+ size_t *ret_prefix_len)
+{
+ int i;
+
+ for (i = 0; prefix_tbl[i].prefix; i++) {
+ size_t prefix_len = strlen(prefix_tbl[i].prefix);
+ if (prefix_tbl[i].name_index == name_index) {
+ if (ret_prefix_len)
+ *ret_prefix_len = prefix_len;
+
+ return prefix_tbl[i].prefix;
+ }
+ }
+ if (ret_prefix_len)
+ *ret_prefix_len = 0;
+
+ return NULL;
+}
projects / reactos.git / blobdiff