mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
125 lines
2.7 KiB
C
125 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* BTRFS filesystem implementation for U-Boot
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*
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* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
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*/
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#include "btrfs.h"
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static int verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
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{
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u16 max_len = BTRFS_NAME_LEN;
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u32 end;
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if (item->type >= BTRFS_FT_MAX) {
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printf("%s: invalid dir item type: %i\n", __func__, item->type);
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return 1;
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}
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if (item->type == BTRFS_FT_XATTR)
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max_len = 255; /* XATTR_NAME_MAX */
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end = start + sizeof(*item) + item->name_len;
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if (item->name_len > max_len || end > total) {
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printf("%s: invalid dir item name len: %u\n", __func__,
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item->name_len);
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return 1;
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}
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return 0;
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}
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static struct btrfs_dir_item *
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btrfs_match_dir_item_name(struct btrfs_path *path, const char *name,
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int name_len)
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{
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struct btrfs_dir_item *item;
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u32 total_len, cur = 0, this_len;
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const char *name_ptr;
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item = btrfs_path_item_ptr(path, struct btrfs_dir_item);
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total_len = btrfs_path_item_size(path);
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while (cur < total_len) {
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btrfs_dir_item_to_cpu(item);
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this_len = sizeof(*item) + item->name_len + item->data_len;
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name_ptr = (const char *) (item + 1);
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if (verify_dir_item(item, cur, total_len))
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return NULL;
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if (item->name_len == name_len && !memcmp(name_ptr, name,
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name_len))
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return item;
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cur += this_len;
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item = (struct btrfs_dir_item *) ((u8 *) item + this_len);
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}
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return NULL;
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}
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int btrfs_lookup_dir_item(const struct btrfs_root *root, u64 dir,
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const char *name, int name_len,
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struct btrfs_dir_item *item)
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{
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struct btrfs_path path;
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struct btrfs_key key;
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struct btrfs_dir_item *res = NULL;
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key.objectid = dir;
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key.type = BTRFS_DIR_ITEM_KEY;
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key.offset = btrfs_name_hash(name, name_len);
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if (btrfs_search_tree(root, &key, &path))
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return -1;
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if (btrfs_comp_keys_type(&key, btrfs_path_leaf_key(&path)))
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goto out;
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res = btrfs_match_dir_item_name(&path, name, name_len);
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if (res)
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*item = *res;
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out:
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btrfs_free_path(&path);
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return res ? 0 : -1;
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}
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int btrfs_readdir(const struct btrfs_root *root, u64 dir,
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btrfs_readdir_callback_t callback)
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{
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struct btrfs_path path;
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struct btrfs_key key, *found_key;
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struct btrfs_dir_item *item;
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int res = 0;
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key.objectid = dir;
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key.type = BTRFS_DIR_INDEX_KEY;
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key.offset = 0;
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if (btrfs_search_tree(root, &key, &path))
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return -1;
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do {
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found_key = btrfs_path_leaf_key(&path);
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if (btrfs_comp_keys_type(&key, found_key))
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break;
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item = btrfs_path_item_ptr(&path, struct btrfs_dir_item);
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btrfs_dir_item_to_cpu(item);
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if (verify_dir_item(item, 0, sizeof(*item) + item->name_len))
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continue;
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if (item->type == BTRFS_FT_XATTR)
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continue;
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if (callback(root, item))
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break;
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} while (!(res = btrfs_next_slot(&path)));
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btrfs_free_path(&path);
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return res < 0 ? -1 : 0;
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}
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