This cleans up the now unneeded code from the old btrfs implementation.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
#
# 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
-obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
- extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o \
+obj-y := btrfs.o compression.o ctree.o dev.o dir-item.o \
+ extent-io.o inode.o subvolume.o crypto/hash.o disk-io.o \
common/rbtree-utils.o extent-cache.o volumes.o root-tree.o
#include "crypto/hash.h"
#include "disk-io.h"
-struct btrfs_info btrfs_info;
struct btrfs_fs_info *current_fs_info;
static int show_dir(struct btrfs_root *root, struct extent_buffer *eb,
struct btrfs_fs_info *fs_info;
int ret = -1;
- btrfs_blk_desc = fs_dev_desc;
- btrfs_part_info = fs_partition;
-
- memset(&btrfs_info, 0, sizeof(btrfs_info));
-
btrfs_hash_init();
- if (btrfs_read_superblock())
- return -1;
-
- if (btrfs_chunk_map_init()) {
- printf("%s: failed to init chunk map\n", __func__);
- return -1;
- }
-
- btrfs_info.tree_root.objectid = 0;
- btrfs_info.tree_root.bytenr = btrfs_info.sb.root;
- btrfs_info.chunk_root.objectid = 0;
- btrfs_info.chunk_root.bytenr = btrfs_info.sb.chunk_root;
-
- if (__btrfs_read_chunk_tree()) {
- printf("%s: failed to read chunk tree\n", __func__);
- return -1;
- }
-
- if (btrfs_find_root(btrfs_get_default_subvol_objectid(),
- &btrfs_info.fs_root, NULL)) {
- printf("%s: failed to find default subvolume\n", __func__);
- return -1;
- }
-
fs_info = open_ctree_fs_info(fs_dev_desc, fs_partition);
if (fs_info) {
current_fs_info = fs_info;
void btrfs_close(void)
{
- btrfs_chunk_map_exit();
if (current_fs_info) {
close_ctree_fs_info(current_fs_info);
current_fs_info = NULL;
#include <linux/rbtree.h>
#include "conv-funcs.h"
-struct btrfs_info {
- struct btrfs_super_block sb;
-
- struct __btrfs_root tree_root;
- struct __btrfs_root fs_root;
- struct __btrfs_root chunk_root;
-
- struct rb_root chunks_root;
-};
-
extern struct btrfs_info btrfs_info;
extern struct btrfs_fs_info *current_fs_info;
-/* dev.c */
-extern struct blk_desc *btrfs_blk_desc;
-extern struct disk_partition *btrfs_part_info;
-
-int btrfs_devread(u64, int, void *);
-
-/* chunk-map.c */
-u64 btrfs_map_logical_to_physical(u64);
-int btrfs_chunk_map_init(void);
-void btrfs_chunk_map_exit(void);
-int __btrfs_read_chunk_tree(void);
-
/* compression.c */
u32 btrfs_decompress(u8 type, const char *, u32, char *, u32);
-/* super.c */
-int btrfs_read_superblock(void);
-
-/* dir-item.c */
-int __btrfs_lookup_dir_item(const struct __btrfs_root *, u64, const char *, int,
- struct btrfs_dir_item *);
-/* root.c */
-int btrfs_find_root(u64, struct __btrfs_root *, struct btrfs_root_item *);
-u64 btrfs_lookup_root_ref(u64, struct btrfs_root_ref *, char *);
-
/* inode.c */
-u64 __btrfs_lookup_inode_ref(struct __btrfs_root *, u64, struct btrfs_inode_ref *,
- char *);
-int __btrfs_lookup_inode(const struct __btrfs_root *, struct btrfs_key *,
- struct btrfs_inode_item *, struct __btrfs_root *);
-int __btrfs_readlink(const struct __btrfs_root *, u64, char *);
int btrfs_readlink(struct btrfs_root *root, u64 ino, char *target);
-u64 __btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
- struct btrfs_inode_item *, int);
-u64 __btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
int btrfs_file_read(struct btrfs_root *root, u64 ino, u64 file_offset, u64 len,
char *dest);
/* subvolume.c */
u64 btrfs_get_default_subvol_objectid(void);
-/* extent-io.c */
-u64 __btrfs_read_extent_inline(struct __btrfs_path *,
- struct btrfs_file_extent_item *, u64, u64,
- char *);
-u64 __btrfs_read_extent_reg(struct __btrfs_path *, struct btrfs_file_extent_item *,
- u64, u64, char *);
-
#endif /* !__BTRFS_BTRFS_H__ */
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * BTRFS filesystem implementation for U-Boot
- *
- * 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
- */
-
-#include "btrfs.h"
-#include <log.h>
-#include <malloc.h>
-
-struct chunk_map_item {
- struct rb_node node;
- u64 logical;
- u64 length;
- u64 physical;
-};
-
-static int add_chunk_mapping(struct btrfs_key *key, struct btrfs_chunk *chunk)
-{
- struct btrfs_stripe *stripe;
- u64 block_profile = chunk->type & BTRFS_BLOCK_GROUP_PROFILE_MASK;
- struct rb_node **new = &(btrfs_info.chunks_root.rb_node), *prnt = NULL;
- struct chunk_map_item *map_item;
-
- if (block_profile && block_profile != BTRFS_BLOCK_GROUP_DUP) {
- printf("%s: unsupported chunk profile %llu\n", __func__,
- block_profile);
- return -1;
- } else if (!chunk->length) {
- printf("%s: zero length chunk\n", __func__);
- return -1;
- }
-
- stripe = &chunk->stripe;
- btrfs_stripe_to_cpu(stripe);
-
- while (*new) {
- struct chunk_map_item *this;
-
- this = rb_entry(*new, struct chunk_map_item, node);
-
- prnt = *new;
- if (key->offset < this->logical) {
- new = &((*new)->rb_left);
- } else if (key->offset > this->logical) {
- new = &((*new)->rb_right);
- } else {
- debug("%s: Logical address %llu already in map!\n",
- __func__, key->offset);
- return 0;
- }
- }
-
- map_item = malloc(sizeof(struct chunk_map_item));
- if (!map_item)
- return -1;
-
- map_item->logical = key->offset;
- map_item->length = chunk->length;
- map_item->physical = le64_to_cpu(chunk->stripe.offset);
- rb_link_node(&map_item->node, prnt, new);
- rb_insert_color(&map_item->node, &btrfs_info.chunks_root);
-
- debug("%s: Mapping %llu to %llu\n", __func__, map_item->logical,
- map_item->physical);
-
- return 0;
-}
-
-u64 btrfs_map_logical_to_physical(u64 logical)
-{
- struct rb_node *node = btrfs_info.chunks_root.rb_node;
-
- while (node) {
- struct chunk_map_item *item;
-
- item = rb_entry(node, struct chunk_map_item, node);
-
- if (item->logical > logical)
- node = node->rb_left;
- else if (logical >= item->logical + item->length)
- node = node->rb_right;
- else
- return item->physical + logical - item->logical;
- }
-
- printf("%s: Cannot map logical address %llu to physical\n", __func__,
- logical);
-
- return -1ULL;
-}
-
-void btrfs_chunk_map_exit(void)
-{
- struct rb_node *now, *next;
- struct chunk_map_item *item;
-
- for (now = rb_first_postorder(&btrfs_info.chunks_root); now; now = next)
- {
- item = rb_entry(now, struct chunk_map_item, node);
- next = rb_next_postorder(now);
- free(item);
- }
-}
-
-int btrfs_chunk_map_init(void)
-{
- u8 sys_chunk_array_copy[sizeof(btrfs_info.sb.sys_chunk_array)];
- u8 * const start = sys_chunk_array_copy;
- u8 * const end = start + btrfs_info.sb.sys_chunk_array_size;
- u8 *cur;
- struct btrfs_key *key;
- struct btrfs_chunk *chunk;
-
- btrfs_info.chunks_root = RB_ROOT;
-
- memcpy(sys_chunk_array_copy, btrfs_info.sb.sys_chunk_array,
- sizeof(sys_chunk_array_copy));
-
- for (cur = start; cur < end;) {
- key = (struct btrfs_key *) cur;
- cur += sizeof(struct btrfs_key);
- chunk = (struct btrfs_chunk *) cur;
-
- btrfs_key_to_cpu(key);
- btrfs_chunk_to_cpu(chunk);
-
- if (key->type != BTRFS_CHUNK_ITEM_KEY) {
- printf("%s: invalid key type %u\n", __func__,
- key->type);
- return -1;
- }
-
- if (add_chunk_mapping(key, chunk))
- return -1;
-
- cur += sizeof(struct btrfs_chunk);
- cur += sizeof(struct btrfs_stripe) * (chunk->num_stripes - 1);
- }
-
- return 0;
-}
-
-int __btrfs_read_chunk_tree(void)
-{
- struct __btrfs_path path;
- struct btrfs_key key, *found_key;
- struct btrfs_chunk *chunk;
- int res = 0;
-
- key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
- key.type = BTRFS_CHUNK_ITEM_KEY;
- key.offset = 0;
-
- if (btrfs_search_tree(&btrfs_info.chunk_root, &key, &path))
- return -1;
-
- do {
- found_key = btrfs_path_leaf_key(&path);
- if (btrfs_comp_keys_type(&key, found_key))
- continue;
-
- chunk = btrfs_path_item_ptr(&path, struct btrfs_chunk);
- btrfs_chunk_to_cpu(chunk);
- if (add_chunk_mapping(found_key, chunk)) {
- res = -1;
- break;
- }
- } while (!(res = btrfs_next_slot(&path)));
-
- __btrfs_free_path(&path);
-
- if (res < 0)
- return -1;
-
- return 0;
-}
while (stream.total_in < clen) {
stream.next_in = cbuf + stream.total_in;
stream.avail_in = min((u32) (clen - stream.total_in),
- (u32) btrfs_info.sb.sectorsize);
+ current_fs_info->sectorsize);
ret = inflate(&stream, Z_NO_FLUSH);
if (ret != Z_OK)
memset(p, 0, sizeof(*p));
}
-int __btrfs_comp_keys(struct btrfs_key *a, struct btrfs_key *b)
-{
- if (a->objectid > b->objectid)
- return 1;
- if (a->objectid < b->objectid)
- return -1;
- if (a->type > b->type)
- return 1;
- if (a->type < b->type)
- return -1;
- if (a->offset > b->offset)
- return 1;
- if (a->offset < b->offset)
- return -1;
- return 0;
-}
-
-int btrfs_comp_keys_type(struct btrfs_key *a, struct btrfs_key *b)
-{
- if (a->objectid > b->objectid)
- return 1;
- if (a->objectid < b->objectid)
- return -1;
- if (a->type > b->type)
- return 1;
- if (a->type < b->type)
- return -1;
- return 0;
-}
-
-/*
- * search for key in the extent_buffer. The items start at offset p,
- * and they are item_size apart. There are 'max' items in p.
- *
- * the slot in the array is returned via slot, and it points to
- * the place where you would insert key if it is not found in
- * the array.
- *
- * slot may point to max if the key is bigger than all of the keys
- */
-static int __generic_bin_search(void *addr, int item_size, struct btrfs_key *key,
- int max, int *slot)
-{
- int low = 0, high = max, mid, ret;
- struct btrfs_key *tmp;
-
- while (low < high) {
- mid = (low + high) / 2;
-
- tmp = (struct btrfs_key *) ((u8 *) addr + mid*item_size);
- ret = __btrfs_comp_keys(tmp, key);
-
- if (ret < 0) {
- low = mid + 1;
- } else if (ret > 0) {
- high = mid;
- } else {
- *slot = mid;
- return 0;
- }
- }
-
- *slot = low;
- return 1;
-}
-
-int __btrfs_bin_search(union btrfs_tree_node *p, struct btrfs_key *key,
- int *slot)
-{
- void *addr;
- unsigned long size;
-
- if (p->header.level) {
- addr = p->node.ptrs;
- size = sizeof(struct btrfs_key_ptr);
- } else {
- addr = p->leaf.items;
- size = sizeof(struct btrfs_item);
- }
-
- return __generic_bin_search(addr, size, key, p->header.nritems, slot);
-}
-
-static void clear_path(struct __btrfs_path *p)
-{
- int i;
-
- for (i = 0; i < BTRFS_MAX_LEVEL; ++i) {
- p->nodes[i] = NULL;
- p->slots[i] = 0;
- }
-}
-
-void __btrfs_free_path(struct __btrfs_path *p)
-{
- int i;
-
- for (i = 0; i < BTRFS_MAX_LEVEL; ++i) {
- if (p->nodes[i])
- free(p->nodes[i]);
- }
-
- clear_path(p);
-}
-
-static int read_tree_node(u64 physical, union btrfs_tree_node **buf)
-{
- ALLOC_CACHE_ALIGN_BUFFER(struct btrfs_header, hdr,
- sizeof(struct btrfs_header));
- unsigned long size, offset = sizeof(*hdr);
- union btrfs_tree_node *res;
- u32 i;
-
- if (!btrfs_devread(physical, sizeof(*hdr), hdr))
- return -1;
-
- btrfs_header_to_cpu(hdr);
-
- if (hdr->level)
- size = sizeof(struct btrfs_node)
- + hdr->nritems * sizeof(struct btrfs_key_ptr);
- else
- size = btrfs_info.sb.nodesize;
-
- res = malloc_cache_aligned(size);
- if (!res) {
- debug("%s: malloc failed\n", __func__);
- return -1;
- }
-
- if (!btrfs_devread(physical + offset, size - offset,
- ((u8 *) res) + offset)) {
- free(res);
- return -1;
- }
-
- memcpy(&res->header, hdr, sizeof(*hdr));
- if (hdr->level)
- for (i = 0; i < hdr->nritems; ++i)
- btrfs_key_ptr_to_cpu(&res->node.ptrs[i]);
- else
- for (i = 0; i < hdr->nritems; ++i)
- btrfs_item_to_cpu(&res->leaf.items[i]);
-
- *buf = res;
-
- return 0;
-}
-
-int btrfs_search_tree(const struct __btrfs_root *root, struct btrfs_key *key,
- struct __btrfs_path *p)
-{
- u8 lvl, prev_lvl;
- int i, slot, ret;
- u64 logical, physical;
- union btrfs_tree_node *buf;
-
- clear_path(p);
-
- logical = root->bytenr;
-
- for (i = 0; i < BTRFS_MAX_LEVEL; ++i) {
- physical = btrfs_map_logical_to_physical(logical);
- if (physical == -1ULL)
- goto err;
-
- if (read_tree_node(physical, &buf))
- goto err;
-
- lvl = buf->header.level;
- if (i && prev_lvl != lvl + 1) {
- printf("%s: invalid level in header at %llu\n",
- __func__, logical);
- goto err;
- }
- prev_lvl = lvl;
-
- ret = __btrfs_bin_search(buf, key, &slot);
- if (ret < 0)
- goto err;
- if (ret && slot > 0 && lvl)
- slot -= 1;
-
- p->slots[lvl] = slot;
- p->nodes[lvl] = buf;
-
- if (lvl) {
- logical = buf->node.ptrs[slot].blockptr;
- } else {
- /*
- * The path might be invalid if:
- * cur leaf max < searched value < next leaf min
- *
- * Jump to the next valid element if it exists.
- */
- if (slot >= buf->header.nritems)
- if (btrfs_next_slot(p) < 0)
- goto err;
- break;
- }
- }
-
- return 0;
-err:
- __btrfs_free_path(p);
- return -1;
-}
-
-static int jump_leaf(struct __btrfs_path *path, int dir)
-{
- struct __btrfs_path p;
- u32 slot;
- int level = 1, from_level, i;
-
- dir = dir >= 0 ? 1 : -1;
-
- p = *path;
-
- while (level < BTRFS_MAX_LEVEL) {
- if (!p.nodes[level])
- return 1;
-
- slot = p.slots[level];
- if ((dir > 0 && slot + dir >= p.nodes[level]->header.nritems)
- || (dir < 0 && !slot))
- level++;
- else
- break;
- }
-
- if (level == BTRFS_MAX_LEVEL)
- return 1;
-
- p.slots[level] = slot + dir;
- level--;
- from_level = level;
-
- while (level >= 0) {
- u64 logical, physical;
-
- slot = p.slots[level + 1];
- logical = p.nodes[level + 1]->node.ptrs[slot].blockptr;
- physical = btrfs_map_logical_to_physical(logical);
- if (physical == -1ULL)
- goto err;
-
- if (read_tree_node(physical, &p.nodes[level]))
- goto err;
-
- if (dir > 0)
- p.slots[level] = 0;
- else
- p.slots[level] = p.nodes[level]->header.nritems - 1;
- level--;
- }
-
- /* Free rewritten nodes in path */
- for (i = 0; i <= from_level; ++i)
- free(path->nodes[i]);
-
- *path = p;
- return 0;
-
-err:
- /* Free rewritten nodes in p */
- for (i = level + 1; i <= from_level; ++i)
- free(p.nodes[i]);
- return -1;
-}
-
-int btrfs_prev_slot(struct __btrfs_path *p)
-{
- if (!p->slots[0])
- return jump_leaf(p, -1);
-
- p->slots[0]--;
- return 0;
-}
-
-int btrfs_next_slot(struct __btrfs_path *p)
-{
- struct btrfs_leaf *leaf = &p->nodes[0]->leaf;
-
- if (p->slots[0] + 1 >= leaf->header.nritems)
- return jump_leaf(p, 1);
-
- p->slots[0]++;
- return 0;
-}
-
int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2)
{
if (k1->objectid > k2->objectid)
struct btrfs_node node;
};
-struct __btrfs_path {
- union btrfs_tree_node *nodes[BTRFS_MAX_LEVEL];
- u32 slots[BTRFS_MAX_LEVEL];
-};
-
-struct __btrfs_root {
- u64 objectid;
- u64 bytenr;
- u64 root_dirid;
-};
-
-int __btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
-int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
-int __btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
-void __btrfs_free_path(struct __btrfs_path *);
-int btrfs_search_tree(const struct __btrfs_root *, struct btrfs_key *,
- struct __btrfs_path *);
-int btrfs_prev_slot(struct __btrfs_path *);
-int btrfs_next_slot(struct __btrfs_path *);
-
-static inline struct btrfs_key *btrfs_path_leaf_key(struct __btrfs_path *p) {
- /* At tree read time we have converted the endian for btrfs_disk_key */
- return (struct btrfs_key *)&p->nodes[0]->leaf.items[p->slots[0]].key;
-}
-
-static inline struct btrfs_key *
-btrfs_search_tree_key_type(const struct __btrfs_root *root, u64 objectid,
- u8 type, struct __btrfs_path *path)
-{
- struct btrfs_key key, *res;
-
- key.objectid = objectid;
- key.type = type;
- key.offset = 0;
-
- if (btrfs_search_tree(root, &key, path))
- return NULL;
-
- res = btrfs_path_leaf_key(path);
- if (btrfs_comp_keys_type(&key, res)) {
- __btrfs_free_path(path);
- return NULL;
- }
-
- return res;
-}
-
-static inline u32 btrfs_path_item_size(struct __btrfs_path *p)
-{
- return p->nodes[0]->leaf.items[p->slots[0]].size;
-}
-
-static inline void *__btrfs_leaf_data(struct btrfs_leaf *leaf, u32 slot)
-{
- return ((u8 *) leaf) + sizeof(struct btrfs_header)
- + leaf->items[slot].offset;
-}
-
-static inline void *btrfs_path_leaf_data(struct __btrfs_path *p)
-{
- return __btrfs_leaf_data(&p->nodes[0]->leaf, p->slots[0]);
-}
-
#define btrfs_path_item_ptr(p,t) \
((t *) btrfs_path_leaf_data((p)))
return btrfs_match_dir_item_name(root, path, name, name_len);
}
-static int __verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
-{
- u16 max_len = BTRFS_NAME_LEN;
- u32 end;
-
- if (item->type >= BTRFS_FT_MAX) {
- printf("%s: invalid dir item type: %i\n", __func__, item->type);
- return 1;
- }
-
- if (item->type == BTRFS_FT_XATTR)
- max_len = 255; /* XATTR_NAME_MAX */
-
- end = start + sizeof(*item) + item->name_len;
- if (item->name_len > max_len || end > total) {
- printf("%s: invalid dir item name len: %u\n", __func__,
- item->name_len);
- return 1;
- }
-
- return 0;
-}
-
-static struct btrfs_dir_item *
-__btrfs_match_dir_item_name(struct __btrfs_path *path, const char *name,
- int name_len)
-{
- struct btrfs_dir_item *item;
- u32 total_len, cur = 0, this_len;
- const char *name_ptr;
-
- item = btrfs_path_item_ptr(path, struct btrfs_dir_item);
-
- total_len = btrfs_path_item_size(path);
-
- while (cur < total_len) {
- btrfs_dir_item_to_cpu(item);
- this_len = sizeof(*item) + item->name_len + item->data_len;
- name_ptr = (const char *) (item + 1);
-
- if (__verify_dir_item(item, cur, total_len))
- return NULL;
- if (item->name_len == name_len && !memcmp(name_ptr, name,
- name_len))
- return item;
-
- cur += this_len;
- item = (struct btrfs_dir_item *) ((u8 *) item + this_len);
- }
-
- return NULL;
-}
-
-int __btrfs_lookup_dir_item(const struct __btrfs_root *root, u64 dir,
- const char *name, int name_len,
- struct btrfs_dir_item *item)
-{
- struct __btrfs_path path;
- struct btrfs_key key;
- struct btrfs_dir_item *res = NULL;
-
- key.objectid = dir;
- key.type = BTRFS_DIR_ITEM_KEY;
- key.offset = btrfs_name_hash(name, name_len);
-
- if (btrfs_search_tree(root, &key, &path))
- return -1;
-
- if (btrfs_comp_keys_type(&key, btrfs_path_leaf_key(&path)))
- goto out;
-
- res = __btrfs_match_dir_item_name(&path, name, name_len);
- if (res)
- *item = *res;
-out:
- __btrfs_free_path(&path);
- return res ? 0 : -1;
-}
-
int btrfs_iter_dir(struct btrfs_root *root, u64 ino,
btrfs_iter_dir_callback_t callback)
{
return 0;
}
-int btrfs_read_superblock(void)
-{
- ALLOC_CACHE_ALIGN_BUFFER(char, raw_sb, BTRFS_SUPER_INFO_SIZE);
- struct btrfs_super_block *sb = (struct btrfs_super_block *) raw_sb;
- int ret;
-
-
- btrfs_info.sb.generation = 0;
-
- ret = btrfs_read_dev_super(btrfs_blk_desc, btrfs_part_info, sb);
- if (ret < 0) {
- pr_debug("%s: No valid BTRFS superblock found!\n", __func__);
- return ret;
- }
- btrfs_super_block_to_cpu(sb);
- memcpy(&btrfs_info.sb, sb, sizeof(*sb));
-
- if (btrfs_info.sb.num_devices != 1) {
- printf("%s: Unsupported number of devices (%lli). This driver "
- "only supports filesystem on one device.\n", __func__,
- btrfs_info.sb.num_devices);
- return -1;
- }
-
- pr_debug("Chosen superblock with generation = %llu\n",
- btrfs_info.sb.generation);
-
- return 0;
-}
-
static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
int verify, int silent, u16 csum_type)
{
#define BTRFS_SUPER_INFO_OFFSET SZ_64K
#define BTRFS_SUPER_INFO_SIZE SZ_4K
-/* U-boot specific */
-int btrfs_read_superblock(void);
-
/* From btrfs-progs */
int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror);
struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
#include "extent-io.h"
#include "disk-io.h"
-u64 __btrfs_read_extent_inline(struct __btrfs_path *path,
- struct btrfs_file_extent_item *extent, u64 offset,
- u64 size, char *out)
-{
- u32 clen, dlen, orig_size = size, res;
- const char *cbuf;
- char *dbuf;
- const int data_off = offsetof(struct btrfs_file_extent_item,
- disk_bytenr);
-
- clen = btrfs_path_item_size(path) - data_off;
- cbuf = (const char *) extent + data_off;
- dlen = extent->ram_bytes;
-
- if (offset > dlen)
- return -1ULL;
-
- if (size > dlen - offset)
- size = dlen - offset;
-
- if (extent->compression == BTRFS_COMPRESS_NONE) {
- memcpy(out, cbuf + offset, size);
- return size;
- }
-
- if (dlen > orig_size) {
- dbuf = malloc(dlen);
- if (!dbuf)
- return -1ULL;
- } else {
- dbuf = out;
- }
-
- res = btrfs_decompress(extent->compression, cbuf, clen, dbuf, dlen);
- if (res == -1 || res != dlen)
- goto err;
-
- if (dlen > orig_size) {
- memcpy(out, dbuf + offset, size);
- free(dbuf);
- } else if (offset) {
- memmove(out, dbuf + offset, size);
- }
-
- return size;
-
-err:
- if (dlen > orig_size)
- free(dbuf);
- return -1ULL;
-}
-
-u64 __btrfs_read_extent_reg(struct __btrfs_path *path,
- struct btrfs_file_extent_item *extent, u64 offset,
- u64 size, char *out)
-{
- u64 physical, clen, dlen, orig_size = size;
- u32 res;
- char *cbuf, *dbuf;
-
- clen = extent->disk_num_bytes;
- dlen = extent->num_bytes;
-
- if (offset > dlen)
- return -1ULL;
-
- if (size > dlen - offset)
- size = dlen - offset;
-
- /* sparse extent */
- if (extent->disk_bytenr == 0) {
- memset(out, 0, size);
- return size;
- }
-
- physical = btrfs_map_logical_to_physical(extent->disk_bytenr);
- if (physical == -1ULL)
- return -1ULL;
-
- if (extent->compression == BTRFS_COMPRESS_NONE) {
- physical += extent->offset + offset;
- if (!btrfs_devread(physical, size, out))
- return -1ULL;
-
- return size;
- }
-
- cbuf = malloc_cache_aligned(dlen > size ? clen + dlen : clen);
- if (!cbuf)
- return -1ULL;
-
- if (dlen > orig_size)
- dbuf = cbuf + clen;
- else
- dbuf = out;
-
- if (!btrfs_devread(physical, clen, cbuf))
- goto err;
-
- res = btrfs_decompress(extent->compression, cbuf, clen, dbuf, dlen);
- if (res == -1)
- goto err;
-
- if (dlen > orig_size)
- memcpy(out, dbuf + offset, size);
- else
- memmove(out, dbuf + offset, size);
-
- free(cbuf);
- return res;
-
-err:
- free(cbuf);
- return -1ULL;
-}
-
void extent_io_tree_init(struct extent_io_tree *tree)
{
cache_tree_init(&tree->state);
#include "disk-io.h"
#include "volumes.h"
-u64 __btrfs_lookup_inode_ref(struct __btrfs_root *root, u64 inr,
- struct btrfs_inode_ref *refp, char *name)
-{
- struct __btrfs_path path;
- struct btrfs_key *key;
- struct btrfs_inode_ref *ref;
- u64 res = -1ULL;
-
- key = btrfs_search_tree_key_type(root, inr, BTRFS_INODE_REF_KEY,
- &path);
-
- if (!key)
- return -1ULL;
-
- ref = btrfs_path_item_ptr(&path, struct btrfs_inode_ref);
- btrfs_inode_ref_to_cpu(ref);
-
- if (refp)
- *refp = *ref;
-
- if (name) {
- if (ref->name_len > BTRFS_NAME_LEN) {
- printf("%s: inode name too long: %u\n", __func__,
- ref->name_len);
- goto out;
- }
-
- memcpy(name, ref + 1, ref->name_len);
- }
-
- res = key->offset;
-out:
- __btrfs_free_path(&path);
- return res;
-}
-
-int __btrfs_lookup_inode(const struct __btrfs_root *root,
- struct btrfs_key *location,
- struct btrfs_inode_item *item,
- struct __btrfs_root *new_root)
-{
- struct __btrfs_root tmp_root = *root;
- struct __btrfs_path path;
- int res = -1;
-
- if (location->type == BTRFS_ROOT_ITEM_KEY) {
- if (btrfs_find_root(location->objectid, &tmp_root, NULL))
- return -1;
-
- location->objectid = tmp_root.root_dirid;
- location->type = BTRFS_INODE_ITEM_KEY;
- location->offset = 0;
- }
-
- if (btrfs_search_tree(&tmp_root, location, &path))
- return res;
-
- if (__btrfs_comp_keys(location, btrfs_path_leaf_key(&path)))
- goto out;
-
- if (item) {
- *item = *btrfs_path_item_ptr(&path, struct btrfs_inode_item);
- btrfs_inode_item_to_cpu(item);
- }
-
- if (new_root)
- *new_root = tmp_root;
-
- res = 0;
-
-out:
- __btrfs_free_path(&path);
- return res;
-}
-
/*
* Read the content of symlink inode @ino of @root, into @target.
* NOTE: @target will not be \0 termiated, caller should handle it properly.
return ret;
}
-int __btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
-{
- struct btrfs_root *subvolume;
- struct btrfs_fs_info *fs_info = current_fs_info;
- struct btrfs_key key;
- int ret;
-
- ASSERT(fs_info);
- key.objectid = root->objectid;
- key.type = BTRFS_ROOT_ITEM_KEY;
- key.offset = (u64)-1;
- subvolume = btrfs_read_fs_root(fs_info, &key);
- if (IS_ERR(subvolume))
- return -1;
-
- ret = btrfs_readlink(subvolume, inr, target);
- if (ret < 0)
- return -1;
- target[ret] = '\0';
- return 0;
-}
-
static int lookup_root_ref(struct btrfs_fs_info *fs_info,
u64 rootid, u64 *root_ret, u64 *dir_ret)
{
return ret;
}
-/* inr must be a directory (for regular files with multiple hard links this
- function returns only one of the parents of the file) */
-static u64 __get_parent_inode(struct __btrfs_root *root, u64 inr,
- struct btrfs_inode_item *inode_item)
-{
- struct btrfs_key key;
- u64 res;
-
- if (inr == BTRFS_FIRST_FREE_OBJECTID) {
- if (root->objectid != btrfs_info.fs_root.objectid) {
- u64 parent;
- struct btrfs_root_ref ref;
-
- parent = btrfs_lookup_root_ref(root->objectid, &ref,
- NULL);
- if (parent == -1ULL)
- return -1ULL;
-
- if (btrfs_find_root(parent, root, NULL))
- return -1ULL;
-
- inr = ref.dirid;
- }
-
- if (inode_item) {
- key.objectid = inr;
- key.type = BTRFS_INODE_ITEM_KEY;
- key.offset = 0;
-
- if (__btrfs_lookup_inode(root, &key, inode_item, NULL))
- return -1ULL;
- }
-
- return inr;
- }
-
- res = __btrfs_lookup_inode_ref(root, inr, NULL, NULL);
- if (res == -1ULL)
- return -1ULL;
-
- if (inode_item) {
- key.objectid = res;
- key.type = BTRFS_INODE_ITEM_KEY;
- key.offset = 0;
-
- if (__btrfs_lookup_inode(root, &key, inode_item, NULL))
- return -1ULL;
- }
-
- return res;
-}
-
static inline int next_length(const char *path)
{
int res = 0;
return ret;
}
-u64 __btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
- u8 *type_p, struct btrfs_inode_item *inode_item_p,
- int symlink_limit)
-{
- struct btrfs_dir_item item;
- struct btrfs_inode_item inode_item;
- u8 type = BTRFS_FT_DIR;
- int len, have_inode = 0;
- const char *cur = path;
-
- if (*cur == '/') {
- ++cur;
- inr = root->root_dirid;
- }
-
- do {
- cur = skip_current_directories(cur);
-
- len = next_length(cur);
- if (len > BTRFS_NAME_LEN) {
- printf("%s: Name too long at \"%.*s\"\n", __func__,
- BTRFS_NAME_LEN, cur);
- return -1ULL;
- }
-
- if (len == 1 && cur[0] == '.')
- break;
-
- if (len == 2 && cur[0] == '.' && cur[1] == '.') {
- cur += 2;
- inr = __get_parent_inode(root, inr, &inode_item);
- if (inr == -1ULL)
- return -1ULL;
-
- type = BTRFS_FT_DIR;
- continue;
- }
-
- if (!*cur)
- break;
-
- if (__btrfs_lookup_dir_item(root, inr, cur, len, &item))
- return -1ULL;
-
- type = item.type;
- have_inode = 1;
- if (__btrfs_lookup_inode(root, (struct btrfs_key *)&item.location,
- &inode_item, root))
- return -1ULL;
-
- if (item.type == BTRFS_FT_SYMLINK && symlink_limit >= 0) {
- char *target;
-
- if (!symlink_limit) {
- printf("%s: Too much symlinks!\n", __func__);
- return -1ULL;
- }
-
- target = malloc(min(inode_item.size + 1,
- (u64) btrfs_info.sb.sectorsize));
- if (!target)
- return -1ULL;
-
- if (__btrfs_readlink(root, item.location.objectid,
- target)) {
- free(target);
- return -1ULL;
- }
-
- inr = __btrfs_lookup_path(root, inr, target, &type,
- &inode_item, symlink_limit - 1);
-
- free(target);
-
- if (inr == -1ULL)
- return -1ULL;
- } else if (item.type != BTRFS_FT_DIR && cur[len]) {
- printf("%s: \"%.*s\" not a directory\n", __func__,
- (int) (cur - path + len), path);
- return -1ULL;
- } else {
- inr = item.location.objectid;
- }
-
- cur += len;
- } while (*cur);
-
- if (type_p)
- *type_p = type;
-
- if (inode_item_p) {
- if (!have_inode) {
- struct btrfs_key key;
-
- key.objectid = inr;
- key.type = BTRFS_INODE_ITEM_KEY;
- key.offset = 0;
-
- if (__btrfs_lookup_inode(root, &key, &inode_item, NULL))
- return -1ULL;
- }
-
- *inode_item_p = inode_item;
- }
-
- return inr;
-}
-
-u64 __btrfs_file_read(const struct __btrfs_root *root, u64 inr, u64 offset,
- u64 size, char *buf)
-{
- struct __btrfs_path path;
- struct btrfs_key key;
- struct btrfs_file_extent_item *extent;
- int res = 0;
- u64 rd, rd_all = -1ULL;
-
- key.objectid = inr;
- key.type = BTRFS_EXTENT_DATA_KEY;
- key.offset = offset;
-
- if (btrfs_search_tree(root, &key, &path))
- return -1ULL;
-
- if (__btrfs_comp_keys(&key, btrfs_path_leaf_key(&path)) < 0) {
- if (btrfs_prev_slot(&path))
- goto out;
-
- if (btrfs_comp_keys_type(&key, btrfs_path_leaf_key(&path)))
- goto out;
- }
-
- rd_all = 0;
-
- do {
- if (btrfs_comp_keys_type(&key, btrfs_path_leaf_key(&path)))
- break;
-
- extent = btrfs_path_item_ptr(&path,
- struct btrfs_file_extent_item);
-
- if (extent->type == BTRFS_FILE_EXTENT_INLINE) {
- btrfs_file_extent_item_to_cpu_inl(extent);
- rd = __btrfs_read_extent_inline(&path, extent, offset,
- size, buf);
- } else {
- btrfs_file_extent_item_to_cpu(extent);
- rd = __btrfs_read_extent_reg(&path, extent, offset, size,
- buf);
- }
-
- if (rd == -1ULL) {
- printf("%s: Error reading extent\n", __func__);
- rd_all = -1;
- goto out;
- }
-
- offset = 0;
- buf += rd;
- rd_all += rd;
- size -= rd;
-
- if (!size)
- break;
- } while (!(res = btrfs_next_slot(&path)));
-
- if (res)
- return -1ULL;
-
-out:
- __btrfs_free_path(&path);
- return rd_all;
-}
-
/*
* Read out inline extent.
*
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * BTRFS filesystem implementation for U-Boot
- *
- * 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
- */
-
-#include "btrfs.h"
-
-static void read_root_item(struct __btrfs_path *p, struct btrfs_root_item *item)
-{
- u32 len;
- int reset = 0;
-
- len = btrfs_path_item_size(p);
- memcpy(item, btrfs_path_item_ptr(p, struct btrfs_root_item), len);
- btrfs_root_item_to_cpu(item);
-
- if (len < sizeof(*item))
- reset = 1;
- if (!reset && item->generation != item->generation_v2) {
- if (item->generation_v2 != 0)
- printf("%s: generation != generation_v2 in root item",
- __func__);
- reset = 1;
- }
- if (reset) {
- memset(&item->generation_v2, 0,
- sizeof(*item) - offsetof(struct btrfs_root_item,
- generation_v2));
- }
-}
-
-int btrfs_find_root(u64 objectid, struct __btrfs_root *root,
- struct btrfs_root_item *root_item)
-{
- struct __btrfs_path path;
- struct btrfs_root_item my_root_item;
-
- if (!btrfs_search_tree_key_type(&btrfs_info.tree_root, objectid,
- BTRFS_ROOT_ITEM_KEY, &path))
- return -1;
-
- if (!root_item)
- root_item = &my_root_item;
- read_root_item(&path, root_item);
-
- if (root) {
- root->objectid = objectid;
- root->bytenr = root_item->bytenr;
- root->root_dirid = root_item->root_dirid;
- }
-
- __btrfs_free_path(&path);
- return 0;
-}
-
-u64 btrfs_lookup_root_ref(u64 subvolid, struct btrfs_root_ref *refp, char *name)
-{
- struct __btrfs_path path;
- struct btrfs_key *key;
- struct btrfs_root_ref *ref;
- u64 res = -1ULL;
-
- key = btrfs_search_tree_key_type(&btrfs_info.tree_root, subvolid,
- BTRFS_ROOT_BACKREF_KEY, &path);
-
- if (!key)
- return -1ULL;
-
- ref = btrfs_path_item_ptr(&path, struct btrfs_root_ref);
- btrfs_root_ref_to_cpu(ref);
-
- if (refp)
- *refp = *ref;
-
- if (name) {
- if (ref->name_len > BTRFS_NAME_LEN) {
- printf("%s: volume name too long: %u\n", __func__,
- ref->name_len);
- goto out;
- }
-
- memcpy(name, ref + 1, ref->name_len);
- }
-
- res = key->offset;
-out:
- __btrfs_free_path(&path);
- return res;
-}
-
return ret;
}
-static int get_subvol_name(u64 subvolid, char *name, int max_len)
-{
- struct btrfs_root_ref rref;
- struct btrfs_inode_ref iref;
- struct __btrfs_root root;
- u64 dir;
- char tmp[BTRFS_NAME_LEN];
- char *ptr;
-
- ptr = name + max_len - 1;
- *ptr = '\0';
-
- while (subvolid != BTRFS_FS_TREE_OBJECTID) {
- subvolid = btrfs_lookup_root_ref(subvolid, &rref, tmp);
-
- if (subvolid == -1ULL)
- return -1;
-
- ptr -= rref.name_len + 1;
- if (ptr < name)
- goto too_long;
-
- memcpy(ptr + 1, tmp, rref.name_len);
- *ptr = '/';
-
- if (btrfs_find_root(subvolid, &root, NULL))
- return -1;
-
- dir = rref.dirid;
-
- while (dir != BTRFS_FIRST_FREE_OBJECTID) {
- dir = __btrfs_lookup_inode_ref(&root, dir, &iref, tmp);
-
- if (dir == -1ULL)
- return -1;
-
- ptr -= iref.name_len + 1;
- if (ptr < name)
- goto too_long;
-
- memcpy(ptr + 1, tmp, iref.name_len);
- *ptr = '/';
- }
- }
-
- if (ptr == name + max_len - 1) {
- name[0] = '/';
- name[1] = '\0';
- } else {
- memmove(name, ptr, name + max_len - ptr);
- }
-
- return 0;
-
-too_long:
- printf("%s: subvolume name too long\n", __func__);
- return -1;
-}
-
-u64 btrfs_get_default_subvol_objectid(void)
-{
- struct btrfs_dir_item item;
-
- if (__btrfs_lookup_dir_item(&btrfs_info.tree_root,
- btrfs_info.sb.root_dir_objectid, "default", 7,
- &item))
- return BTRFS_FS_TREE_OBJECTID;
- return item.location.objectid;
-}
-
-static void list_subvols(u64 tree, char *nameptr, int max_name_len, int level)
-{
- struct btrfs_key key, *found_key;
- struct __btrfs_path path;
- struct btrfs_root_ref *ref;
- int res;
-
- key.objectid = tree;
- key.type = BTRFS_ROOT_REF_KEY;
- key.offset = 0;
-
- if (btrfs_search_tree(&btrfs_info.tree_root, &key, &path))
- return;
-
- do {
- found_key = btrfs_path_leaf_key(&path);
- if (btrfs_comp_keys_type(&key, found_key))
- break;
-
- ref = btrfs_path_item_ptr(&path, struct btrfs_root_ref);
- btrfs_root_ref_to_cpu(ref);
-
- printf("ID %llu parent %llu name ", found_key->offset, tree);
- if (nameptr && !get_subvol_name(found_key->offset, nameptr,
- max_name_len))
- printf("%s\n", nameptr);
- else
- printf("%.*s\n", (int) ref->name_len,
- (const char *) (ref + 1));
-
- if (level > 0)
- list_subvols(found_key->offset, nameptr, max_name_len,
- level - 1);
- else
- printf("%s: Too much recursion, maybe skipping some "
- "subvolumes\n", __func__);
- } while (!(res = btrfs_next_slot(&path)));
-
- __btrfs_free_path(&path);
-}
-
void btrfs_list_subvols(void)
{
struct btrfs_fs_info *fs_info = current_fs_info;
projects / platform / kernel / u-boot.git / commitdiff