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fs: btrfs: Cleanup the old implementation

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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>
This commit is contained in:
Qu Wenruo 2020-06-24 18:03:15 +02:00 committed by Tom Rini
parent e8e95c7ee1
commit 5573c20fad
14 changed files with 3 additions and 1366 deletions
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4
fs/btrfs/Makefile
View File

@ -2,6 +2,6 @@
#
# 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

31
fs/btrfs/btrfs.c
View File

@ -13,7 +13,6 @@
#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,
@ -120,36 +119,7 @@ int btrfs_probe(struct blk_desc *fs_dev_desc,
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;
@ -297,7 +267,6 @@ int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
void btrfs_close(void)
{
btrfs_chunk_map_exit();
if (current_fs_info) {
close_ctree_fs_info(current_fs_info);
current_fs_info = NULL;

47
fs/btrfs/btrfs.h
View File

@ -11,65 +11,18 @@
#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__ */

178
fs/btrfs/chunk-map.c
View File

@ -1,178 +0,0 @@
// 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;
}

2
fs/btrfs/compression.c
View File

@ -115,7 +115,7 @@ static u32 decompress_zlib(const u8 *_cbuf, u32 clen, u8 *dbuf, u32 dlen)
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)

290
fs/btrfs/ctree.c
View File

@ -70,296 +70,6 @@ void btrfs_release_path(struct btrfs_path *p)
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)

63
fs/btrfs/ctree.h
View File

@ -1204,69 +1204,6 @@ union btrfs_tree_node {
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)))

79
fs/btrfs/dir-item.c
View File

@ -114,85 +114,6 @@ struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
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)
{

30
fs/btrfs/disk-io.c
View File

@ -310,36 +310,6 @@ int btrfs_read_dev_super(struct blk_desc *desc, struct disk_partition *part,
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)
{

3
fs/btrfs/disk-io.h
View File

@ -10,9 +10,6 @@
#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,

116
fs/btrfs/extent-io.c
View File

@ -14,122 +14,6 @@
#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);

323
fs/btrfs/inode.c
View File

@ -12,81 +12,6 @@
#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.
@ -143,28 +68,6 @@ out:
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)
{
@ -274,58 +177,6 @@ out:
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;
@ -493,180 +344,6 @@ next:
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.
*

92
fs/btrfs/root.c
View File

@ -1,92 +0,0 @@
// 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;
}

111
fs/btrfs/subvolume.c
View File

@ -221,117 +221,6 @@ out:
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;