+/*
+ * Copyright (c) 2015 Grzegorz Kostka (kostka.grzegorz@gmail.com)
+ * Copyright (c) 2015 Kaho Ng (ngkaho1234@gmail.com)
+ *
+ *
+ * HelenOS:
+ * Copyright (c) 2012 Martin Sucha
+ * Copyright (c) 2012 Frantisek Princ
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup lwext4
+ * @{
+ */
+/**
+ * @file ext4_xattr.c
+ * @brief Extended Attribute manipulation.
+ */
+
#include "ext4_config.h"
#include "ext4_types.h"
#include "ext4_fs.h"
#include "ext4_debug.h"
#include "ext4_block_group.h"
#include "ext4_balloc.h"
-#include "ext4_bitmap.h"
#include "ext4_inode.h"
-#include "ext4_ialloc.h"
#include "ext4_extent.h"
#include <string.h>
+#include <stdlib.h>
+
+/**
+ * @file ext4_xattr.c
+ * @brief Extended Attribute Manipulation
+ */
+
+#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)
+{
+ uint32_t 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) {
+ uint32_t *value = (uint32_t *)((char *)header +
+ to_le16(entry->e_value_offs));
+ for (n = (to_le32(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)) ^
+ to_le32(*value++);
+ }
+ }
+ entry->e_hash = 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;
+ uint32_t 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)) ^
+ to_le32(here->e_hash);
+ here = EXT4_XATTR_NEXT(here);
+ }
+ header->h_hash = to_le32(hash);
+}
+
+static int ext4_xattr_item_cmp(struct ext4_xattr_item *a,
+ struct ext4_xattr_item *b)
+{
+ int result;
+ result = a->name_index - b->name_index;
+ if (result)
+ return result;
+
+ result = a->name_len - b->name_len;
+ if (result)
+ return result;
+
+ return memcmp(a->name, b->name, a->name_len);
+}
+
+RB_GENERATE_INTERNAL(ext4_xattr_tree,
+ ext4_xattr_item,
+ node,
+ ext4_xattr_item_cmp,
+ static inline)
+
+static struct ext4_xattr_item *
+ext4_xattr_item_alloc(uint8_t name_index,
+ char *name,
+ size_t name_len)
+{
+ struct ext4_xattr_item *item;
+ item = malloc(sizeof(struct ext4_xattr_item) +
+ name_len);
+ 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;
+
+ memset(&item->node, 0, sizeof(item->node));
+ memcpy(item->name, name, name_len);
+
+ return item;
+}
+
+static int
+ext4_xattr_item_alloc_data(struct ext4_xattr_item *item,
+ void *orig_data,
+ size_t data_size)
+{
+ void *data = NULL;
+ ext4_assert(!item->data);
+ data = malloc(data_size);
+ if (!data)
+ return ENOMEM;
+
+ if (orig_data)
+ memcpy(data, orig_data, data_size);
+
+ item->data = data;
+ item->data_size = data_size;
+ return EOK;
+}
+
+static void
+ext4_xattr_item_free_data(struct ext4_xattr_item *item)
+{
+ ext4_assert(item->data);
+ free(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 = realloc(item->data, new_data_size);
+ if (!new_data)
+ return ENOMEM;
+
+ item->data = new_data;
+ item->data_size = new_data_size;
+ }
+ return EOK;
+}
+
+static void
+ext4_xattr_item_free(struct ext4_xattr_item *item)
+{
+ if (item->data)
+ ext4_xattr_item_free_data(item);
+
+ free(item);
+}
+
static void *ext4_xattr_entry_data(struct ext4_xattr_ref *xattr_ref,
struct ext4_xattr_entry *entry,
return ret;
}
-static int ext4_xattr_block_lookup(struct ext4_xattr_ref *xattr_ref,
- uint8_t name_index,
- char *name,
- size_t name_len,
- struct ext4_xattr_entry **found_entry,
- void **out_data,
- size_t *out_len)
+static int ext4_xattr_block_fetch(struct ext4_xattr_ref *xattr_ref)
{
+ int ret = EOK;
size_t size_rem;
- bool entry_found = false;
void *data;
struct ext4_xattr_entry *entry = NULL;
for(;size_rem > 0 && !EXT4_XATTR_IS_LAST_ENTRY(entry);
entry = EXT4_XATTR_NEXT(entry),
size_rem -= EXT4_XATTR_LEN(entry->e_name_len)) {
- int diff = -1;
- if (name_index == entry->e_name_index &&
- name_len == entry->e_name_len) {
- char *e_name = (char *)(entry + 1);
- diff = memcmp(e_name,
- name,
- name_len);
- }
- if (!diff) {
- entry_found = true;
- break;
- }
- }
- if (!entry_found)
- return ENOENT;
-
- data = ext4_xattr_entry_data(xattr_ref, entry,
- false);
- if (!data)
- return EIO;
+ struct ext4_xattr_item *item;
+ char *e_name = EXT4_XATTR_NAME(entry);
- if (found_entry)
- *found_entry = entry;
+ data = ext4_xattr_entry_data(xattr_ref, entry,
+ false);
+ if (!data) {
+ ret = EIO;
+ goto Finish;
+ }
- if (out_data && out_len) {
- *out_data = data;
- *out_len = to_le32(entry->e_value_size);
+ 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,
+ to_le32(entry->e_value_size))
+ != EOK) {
+ ext4_xattr_item_free(item);
+ ret = ENOMEM;
+ goto Finish;
+ }
+ RB_INSERT(ext4_xattr_tree, &xattr_ref->root, item);
+ xattr_ref->ea_size += EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
}
- return EOK;
+Finish:
+ return ret;
}
-static int ext4_xattr_inode_lookup(struct ext4_xattr_ref *xattr_ref,
- uint8_t name_index,
- char *name,
- size_t name_len,
- struct ext4_xattr_entry **found_entry,
- void **out_data,
- size_t *out_len)
+static int ext4_xattr_inode_fetch(struct ext4_xattr_ref *xattr_ref)
{
void *data;
size_t size_rem;
- bool entry_found = false;
+ int ret = EOK;
struct ext4_xattr_ibody_header *header = NULL;
struct ext4_xattr_entry *entry = NULL;
uint16_t inode_size = ext4_get16(&xattr_ref->fs->sb,
for(;size_rem > 0 && !EXT4_XATTR_IS_LAST_ENTRY(entry);
entry = EXT4_XATTR_NEXT(entry),
size_rem -= EXT4_XATTR_LEN(entry->e_name_len)) {
- int diff = -1;
- if (name_index == entry->e_name_index &&
- name_len == entry->e_name_len) {
- char *e_name = (char *)(entry + 1);
- diff = memcmp(e_name,
- name,
- 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;
}
- if (!diff) {
- entry_found = true;
- break;
+
+ 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,
+ to_le32(entry->e_value_size))
+ != EOK) {
+ ext4_xattr_item_free(item);
+ ret = ENOMEM;
+ goto Finish;
}
+ RB_INSERT(ext4_xattr_tree, &xattr_ref->root, item);
+ xattr_ref->ea_size += EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
}
- if (!entry_found)
- return ENOENT;
- data = ext4_xattr_entry_data(xattr_ref, entry,
- true);
- if (!data)
- return EIO;
+Finish:
+ return ret;
+}
- if (found_entry)
- *found_entry = entry;
- if (out_data && out_len) {
- *out_data = data;
- *out_len = to_le32(entry->e_value_size);
- }
+static size_t
+ext4_xattr_inode_space(struct ext4_xattr_ref *xattr_ref)
+{
+ uint16_t inode_size = ext4_get16(&xattr_ref->fs->sb,
+ inode_size);
+ uint16_t size_rem = inode_size -
+ EXT4_GOOD_OLD_INODE_SIZE -
+ xattr_ref->inode_ref->inode->extra_isize;
+ return size_rem;
+}
- return EOK;
+static size_t
+ext4_xattr_block_space(struct ext4_xattr_ref *xattr_ref)
+{
+ return ext4_sb_get_block_size(&xattr_ref->fs->sb);
}
-int ext4_xattr_lookup(struct ext4_xattr_ref *xattr_ref,
- uint8_t name_index,
- char *name,
- size_t name_len,
- struct ext4_xattr_entry **found_entry,
- void **out_data,
- size_t *out_len)
+static int ext4_xattr_fetch(struct ext4_xattr_ref *xattr_ref)
{
- int ret = ENOENT;
+ int ret = EOK;
uint16_t inode_size = ext4_get16(&xattr_ref->fs->sb,
inode_size);
if (inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
- ret = ext4_xattr_inode_lookup(xattr_ref,
- name_index,
- name,
- name_len,
- found_entry,
- out_data,
- out_len);
- if (ret != ENOENT)
+ ret = ext4_xattr_inode_fetch(xattr_ref);
+ if (ret != EOK)
return ret;
}
if (xattr_ref->block_loaded)
- ret = ext4_xattr_block_lookup(xattr_ref,
+ 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,
+ uint8_t name_index,
+ char *name,
+ size_t name_len)
+{
+ struct ext4_xattr_item tmp, *ret;
+ tmp.name_index = name_index;
+ tmp.name = name;
+ tmp.name_len = name_len;
+ ret = RB_FIND(ext4_xattr_tree, &xattr_ref->root,
+ &tmp);
+ return ret;
+}
+
+static struct ext4_xattr_item *
+ext4_xattr_insert_item(struct ext4_xattr_ref *xattr_ref,
+ uint8_t name_index,
+ char *name,
+ size_t name_len,
+ void *data,
+ size_t data_size)
+{
+ struct ext4_xattr_item *item;
+ item = ext4_xattr_item_alloc(name_index,
+ name,
+ name_len);
+ if (!item)
+ return NULL;
+
+ if (xattr_ref->ea_size + EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len) >
+ ext4_xattr_inode_space(xattr_ref) +
+ ext4_xattr_block_space(xattr_ref)) {
+ ext4_xattr_item_free(item);
+ return NULL;
+ }
+ if (ext4_xattr_item_alloc_data(item,
+ data,
+ data_size) != EOK) {
+ ext4_xattr_item_free(item);
+ return NULL;
+ }
+ RB_INSERT(ext4_xattr_tree, &xattr_ref->root, item);
+ xattr_ref->ea_size += EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ xattr_ref->dirty = true;
+ return item;
+}
+
+static int
+ext4_xattr_remove_item(struct ext4_xattr_ref *xattr_ref,
+ uint8_t name_index,
+ 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) {
+ RB_REMOVE(ext4_xattr_tree, &xattr_ref->root, item);
+ ext4_xattr_item_free(item);
+ xattr_ref->ea_size -= EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
+ xattr_ref->dirty = true;
+ ret = EOK;
+ }
+ 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 = EOK;
+ if (xattr_ref->ea_size - EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_SIZE(new_data_size) >
+ ext4_xattr_inode_space(xattr_ref) +
+ ext4_xattr_block_space(xattr_ref)) {
+
+ return ENOSPC;
+ }
+ ret = ext4_xattr_item_resize_data(item,
+ new_data_size);
+ if (ret != EOK) {
+ return ret;
+ }
+ xattr_ref->ea_size -= EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_SIZE(new_data_size);
+ xattr_ref->dirty = true;
+ return ret;
+}
+
+static void
+ext4_xattr_purge_items(struct ext4_xattr_ref *xattr_ref)
+{
+ struct ext4_xattr_item *item, *save_item;
+ RB_FOREACH_SAFE(item,
+ ext4_xattr_tree,
+ &xattr_ref->root,
+ save_item) {
+ RB_REMOVE(ext4_xattr_tree, &xattr_ref->root, item);
+ ext4_xattr_item_free(item);
+ }
+ xattr_ref->ea_size = sizeof(struct ext4_xattr_header) +
+ sizeof(struct ext4_xattr_ibody_header);
+}
+
+
+static int
+ext4_xattr_try_alloc_block(struct ext4_xattr_ref *xattr_ref)
+{
+ int ret = EOK;
+
+ uint64_t xattr_block;
+ xattr_block = ext4_inode_get_file_acl(xattr_ref->inode_ref->inode,
+ &xattr_ref->fs->sb);
+ if (!xattr_block) {
+ ret = ext4_balloc_alloc_block(xattr_ref->inode_ref,
+ (uint32_t *)&xattr_block);
+ if (ret != EOK)
+ goto Finish;
+
+ ret = ext4_block_get(xattr_ref->fs->bdev,
+ &xattr_ref->block,
+ xattr_block);
+ if (ret != EOK) {
+ ext4_balloc_free_block(xattr_ref->inode_ref,
+ xattr_block);
+ goto Finish;
+ }
+
+ ext4_inode_set_file_acl(xattr_ref->inode_ref->inode,
+ &xattr_ref->fs->sb,
+ xattr_block);
+ xattr_ref->inode_ref->dirty = true;
+ xattr_ref->block_loaded = true;
+ xattr_ref->ea_size += sizeof(struct ext4_xattr_header);
+}
+
+Finish:
+ return ret;
+}
+
+static void
+ext4_xattr_try_free_block(struct ext4_xattr_ref *xattr_ref)
+{
+ uint64_t xattr_block;
+ xattr_block =
+ ext4_inode_get_file_acl(xattr_ref->inode_ref->inode,
+ &xattr_ref->fs->sb);
+ ext4_inode_set_file_acl(xattr_ref->inode_ref->inode,
+ &xattr_ref->fs->sb,
+ 0);
+ ext4_block_set(xattr_ref->fs->bdev,
+ &xattr_ref->block);
+ ext4_balloc_free_block(xattr_ref->inode_ref,
+ xattr_block);
+ xattr_ref->inode_ref->dirty = true;
+ xattr_ref->block_loaded = false;
+ xattr_ref->ea_size -= sizeof(struct ext4_xattr_header);
+
+}
+
+static int
+ext4_xattr_write_to_disk(struct ext4_xattr_ref *xattr_ref)
+{
+ int ret = EOK;
+ bool block_modified = false;
+ void *ibody_data, *block_data;
+ struct ext4_xattr_item *item, *save_item;
+ size_t inode_size_rem, block_size_rem;
+ struct ext4_xattr_header *header = NULL;
+ struct ext4_xattr_ibody_header *ibody_header = NULL;
+ struct ext4_xattr_entry *entry = NULL;
+ struct ext4_xattr_entry *block_entry = 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->inode_ref->inode);
+ entry = EXT4_XATTR_IFIRST(ibody_header);
+ }
+
+ if (xattr_ref->dirty) {
+ /* 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;
+ xattr_ref->inode_ref->dirty = true;
+ ibody_data = (char *)ibody_header + inode_size_rem;
+ inode_size_rem -= sizeof(struct ext4_xattr_ibody_header);
+ }
+ /* 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 != EOK)
+ goto Finish;
+
+ }
+ header = EXT4_XATTR_BHDR(&xattr_ref->block);
+ block_entry = EXT4_XATTR_BFIRST(&xattr_ref->block);
+ memset(header, 0, sizeof(struct ext4_xattr_header));
+ header->h_magic = EXT4_XATTR_MAGIC;
+ header->h_refcount = to_le32(1);
+ header->h_blocks = to_le32(1);
+ block_data = (char *)header + block_size_rem;
+ block_size_rem -= sizeof(struct ext4_xattr_header);
+ xattr_ref->block.dirty = true;
+ } else {
+ /* We don't need an extra block.*/
+ if (xattr_ref->block_loaded) {
+ header = EXT4_XATTR_BHDR(&xattr_ref->block);
+ header->h_refcount =
+ to_le32(to_le32(header->h_refcount) - 1);
+ if (!header->h_refcount) {
+ ext4_xattr_try_free_block(xattr_ref);
+ header = NULL;
+ } else {
+ xattr_ref->block.dirty = true;
+ block_entry = EXT4_XATTR_BFIRST(&xattr_ref->block);
+ block_data = (char *)header + block_size_rem;
+ block_size_rem -= sizeof(struct ext4_xattr_header);
+ }
+ }
+ }
+ RB_FOREACH_SAFE(item,
+ ext4_xattr_tree,
+ &xattr_ref->root,
+ save_item) {
+ if (EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len) <=
+ inode_size_rem) {
+ ibody_data = (char *)ibody_data - EXT4_XATTR_SIZE(item->data_size);
+ entry->e_name_len = to_le32(item->name_len);
+ entry->e_name_index = item->name_index;
+ entry->e_value_offs =
+ (char *)ibody_data -
+ (char *)EXT4_XATTR_IFIRST(ibody_header);
+ entry->e_value_block = 0;
+ entry->e_value_size = item->data_size;
+ 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);
+ continue;
+ }
+ if (EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len) > block_size_rem) {
+ ret = ENOSPC;
+ goto Finish;
+ }
+ block_data = (char *)block_data - EXT4_XATTR_SIZE(item->data_size);
+ block_entry->e_name_len = to_le32(item->name_len);
+ block_entry->e_name_index = item->name_index;
+ block_entry->e_value_offs =
+ (char *)block_data - (char *)header;
+ block_entry->e_value_block = 0;
+ block_entry->e_value_size = item->data_size;
+ memcpy(EXT4_XATTR_NAME(block_entry), item->name, item->name_len);
+ memcpy(block_data, item->data, item->data_size);
+ 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(header,
+ EXT4_XATTR_BFIRST(&xattr_ref->block));
+ }
+ }
+
+Finish:
+ return ret;
+}
+
+
+int ext4_fs_set_xattr(struct ext4_xattr_ref *ref,
+ uint8_t name_index,
+ char *name,
+ size_t name_len,
+ void *data,
+ size_t data_size,
+ bool replace)
+{
+ int ret = EOK;
+ struct ext4_xattr_item *item =
+ ext4_xattr_lookup_item(ref,
+ name_index,
+ name,
+ name_len);
+ if (replace) {
+ if (!item) {
+ ret = ENOATTR;
+ goto Finish;
+ }
+ if (item->data_size != data_size)
+ ret = ext4_xattr_resize_item(ref,
+ item,
+ data_size);
+
+ if (ret != EOK) {
+ 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,
- found_entry,
- out_data,
- out_len);
+ data,
+ data_size);
+ if (!item)
+ ret = ENOMEM;
+
+ }
+Finish:
+ return ret;
+}
+
+int ext4_fs_remove_xattr(struct ext4_xattr_ref *ref,
+ uint8_t name_index,
+ 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,
+ uint8_t name_index,
+ char *name,
+ size_t name_len,
+ void *buf,
+ size_t buf_size,
+ size_t *size_got)
+{
+ int ret = EOK;
+ size_t item_size = 0;
+ struct ext4_xattr_item *item =
+ ext4_xattr_lookup_item(ref,
+ name_index,
+ name,
+ name_len);
+
+ if (!item) {
+ ret = ENOATTR;
+ 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 (size_got)
+ *size_got = buf_size;
+
return ret;
}
uint64_t xattr_block;
xattr_block = ext4_inode_get_file_acl(inode_ref->inode,
&fs->sb);
+ RB_INIT(&ref->root);
+ ref->ea_size = 0;
if (xattr_block) {
rc = ext4_block_get(fs->bdev,
&inode_ref->block, xattr_block);
if (rc != EOK)
return EIO;
+ ref->ea_size += sizeof(struct ext4_xattr_header);
ref->block_loaded = true;
} else
ref->block_loaded = false;
ref->inode_ref = inode_ref;
ref->fs = fs;
+
+ if (ext4_xattr_inode_space(ref) >
+ sizeof(struct ext4_xattr_ibody_header))
+ ref->ea_size += sizeof(struct ext4_xattr_ibody_header);
+
+ rc = ext4_xattr_fetch(ref);
+ if (rc != EOK) {
+ ext4_xattr_purge_items(ref);
+ if (xattr_block)
+ ext4_block_set(fs->bdev, &inode_ref->block);
+
+ ref->block_loaded = false;
+ return rc;
+ }
return EOK;
}
ext4_block_set(ref->fs->bdev, &ref->block);
ref->block_loaded = false;
}
+ ext4_xattr_write_to_disk(ref);
+ ext4_xattr_purge_items(ref);
ref->inode_ref = NULL;
ref->fs = NULL;
}
+/**
+ * @}
+ */
projects / lwext4.git / blobdiff