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)
{
ret = NULL;
} else {
- uint32_t block_size =
- ext4_sb_get_block_size(&xattr_ref->fs->sb);
+ int32_t block_size =
+ ext4_sb_get_block_size(&xattr_ref->fs->sb);
ret = (void *)((char *)xattr_ref->block.data +
to_le16(entry->e_value_offs));
if ((char *)ret + EXT4_XATTR_SIZE(to_le32(entry->e_value_size))
goto Finish;
}
RB_INSERT(ext4_xattr_tree, &xattr_ref->root, item);
- xattr_ref->ea_size += item->data_size;
+ xattr_ref->ea_size += EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
}
Finish:
goto Finish;
}
RB_INSERT(ext4_xattr_tree, &xattr_ref->root, item);
- xattr_ref->ea_size += item->data_size;
+ xattr_ref->ea_size += EXT4_XATTR_SIZE(item->data_size) +
+ EXT4_XATTR_LEN(item->name_len);
}
Finish:
return ret;
}
+
+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;
+}
+
+static size_t
+ext4_xattr_block_space(struct ext4_xattr_ref *xattr_ref)
+{
+ return ext4_sb_get_block_size(&xattr_ref->fs->sb);
+}
+
static int ext4_xattr_fetch(struct ext4_xattr_ref *xattr_ref)
{
int ret = EOK;
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) {
+ if (item == xattr_ref->iter_from)
+ xattr_ref->iter_from = RB_NEXT(ext4_xattr_tree,
+ &xattr_ref->root,
+ 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;
+ uint64_t xattr_block = ext4_inode_get_file_acl(xattr_ref->inode_ref->inode,
+ &xattr_ref->fs->sb);
RB_FOREACH_SAFE(item,
ext4_xattr_tree,
&xattr_ref->root,
ext4_xattr_item_free(item);
}
xattr_ref->ea_size = 0;
+ if (xattr_block)
+ xattr_ref->ea_size += sizeof(struct ext4_xattr_header);
+
+ if (ext4_xattr_inode_space(xattr_ref) >
+ sizeof(struct ext4_xattr_ibody_header))
+ xattr_ref->ea_size += sizeof(struct ext4_xattr_ibody_header);
}
-static size_t
-ext4_xattr_inode_space(struct ext4_xattr_ref *xattr_ref)
+
+static int
+ext4_xattr_try_alloc_block(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;
+ int ret = EOK;
+
+ uint64_t xattr_block = 0;
+ 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 size_t
-ext4_xattr_block_space(struct ext4_xattr_ref *xattr_ref)
+static void
+ext4_xattr_try_free_block(struct ext4_xattr_ref *xattr_ref)
{
- return ext4_sb_get_block_size(&xattr_ref->fs->sb);
+ 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 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);
+
+ memset(block_header, 0, sizeof(struct ext4_xattr_header));
+ block_header->h_magic = EXT4_XATTR_MAGIC;
+ block_header->h_refcount = to_le32(1);
+ block_header->h_blocks = 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 = to_le32(item->name_len);
+ entry->e_name_index = item->name_index;
+ entry->e_value_offs =
+ (char *)ibody_data_ptr -
+ (char *)EXT4_XATTR_IFIRST(ibody_header);
+ entry->e_value_block = 0;
+ entry->e_value_size = 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 = to_le32(item->name_len);
+ block_entry->e_name_index = item->name_index;
+ block_entry->e_value_offs =
+ (char *)block_data_ptr - (char *)block_header;
+ block_entry->e_value_block = 0;
+ block_entry->e_value_size = item->data_size;
}
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_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;
+
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;
+ ibody_data = (char *)ibody_header + inode_size_rem;
+ inode_size_rem -= sizeof(struct ext4_xattr_ibody_header);
+
+ xattr_ref->inode_ref->dirty = 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 != EOK)
+ goto Finish;
+
+ }
+ block_header = EXT4_XATTR_BHDR(&xattr_ref->block);
+ block_entry = EXT4_XATTR_BFIRST(&xattr_ref->block);
+ ext4_xattr_set_block_header(xattr_ref);
+ block_data = (char *)block_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) {
+ block_header = EXT4_XATTR_BHDR(&xattr_ref->block);
+ block_header->h_refcount =
+ to_le32(to_le32(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);
+ block_data = (char *)block_header + block_size_rem;
+ block_size_rem -= sizeof(struct ext4_xattr_header);
+ ext4_inode_set_file_acl(xattr_ref->inode_ref->inode,
+ &xattr_ref->fs->sb,
+ 0);
+
+ xattr_ref->inode_ref->dirty = true;
+ xattr_ref->block.dirty = true;
+ }
+ }
+ }
RB_FOREACH_SAFE(item,
ext4_xattr_tree,
&xattr_ref->root,
save_item) {
- /*This should not fail!*/
- ext4_assert(inode_size_rem + block_size_rem);
- if (inode_size_rem) {
-
+ 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);
+ 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->inode_ref->dirty = true;
+ 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);
+ 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);
+ 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));
+ xattr_ref->block.dirty = true;
+ }
}
+
+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))
+{
+ struct ext4_xattr_item *item;
+ if (!ref->iter_from)
+ ref->iter_from = RB_MIN(ext4_xattr_tree, &ref->root);
+
+ RB_FOREACH_FROM(item,
+ ext4_xattr_tree,
+ ref->iter_from) {
+ int ret = EXT4_XATTR_ITERATE_CONT;
+ if (iter)
+ iter(ref, item);
+
+ if (ret != EXT4_XATTR_ITERATE_CONT) {
+ if (ret == EXT4_XATTR_ITERATE_STOP)
+ ref->iter_from = NULL;
+
+ break;
+ }
+ }
+}
+
+static 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,
+ 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,
+ 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;
}
xattr_block = ext4_inode_get_file_acl(inode_ref->inode,
&fs->sb);
RB_INIT(&ref->root);
+ ref->ea_size = 0;
+ ref->iter_from = NULL;
if (xattr_block) {
rc = ext4_block_get(fs->bdev,
- &inode_ref->block, xattr_block);
+ &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);
void ext4_fs_put_xattr_ref(struct ext4_xattr_ref *ref)
{
+ ext4_xattr_write_to_disk(ref);
if (ref->block_loaded) {
ext4_block_set(ref->fs->bdev, &ref->block);
ref->block_loaded = false;
projects / lwext4.git / blobdiff