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fs: btrfs: Crossport extent-io.[ch] from btrfs-progs

Browse source 
This brings the extent_io_tree infrastructure, with which we can finally
bring in proper btrfs_fs_info structure to ctree.h.

With read/write_extent_buffer() implemented we also backport
read/write_eb_member() to ctree.h.

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 18:02:52 +02:00 committed by Tom Rini
parent ab5c3046f2
commit 9a9be5ec17
3 changed files with 1019 additions and 1 deletions
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55
fs/btrfs/ctree.h
View file

@ -11,8 +11,10 @@
#include <common.h>
#include <compiler.h>
#include <linux/rbtree.h>
#include "kernel-shared/btrfs_tree.h"
#include "compat.h"
#include "extent-io.h"
#define BTRFS_MAX_MIRRORS 3
@ -48,6 +50,18 @@
#define BTRFS_FS_STATE_DEV_REPLACING 3
#define BTRFS_FS_STATE_DUMMY_FS_INFO 4
#define read_eb_member(eb, ptr, type, member, result) ( \
read_extent_buffer(eb, (char *)(result), \
((unsigned long)(ptr)) + \
offsetof(type, member), \
sizeof(((type *)0)->member)))
#define write_eb_member(eb, ptr, type, member, result) ( \
write_extent_buffer(eb, (char *)(result), \
((unsigned long)(ptr)) + \
offsetof(type, member), \
sizeof(((type *)0)->member)))
#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
static inline u##bits btrfs_##name(const type *s) \
{ \
@ -75,6 +89,47 @@ struct btrfs_root {
u64 root_dirid;
};
struct btrfs_mapping_tree {
struct cache_tree cache_tree;
};
struct btrfs_device;
struct btrfs_fs_info {
u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
u8 *new_chunk_tree_uuid;
struct btrfs_root *fs_root;
struct btrfs_root *tree_root;
struct btrfs_root *chunk_root;
struct btrfs_root *csum_root;
struct rb_root fs_root_tree;
struct extent_io_tree extent_cache;
struct extent_io_tree free_space_cache;
struct extent_io_tree pinned_extents;
struct extent_io_tree extent_ins;
struct extent_io_tree *excluded_extents;
struct rb_root block_group_cache_tree;
/* logical->physical extent mapping */
struct btrfs_mapping_tree mapping_tree;
u64 generation;
u64 last_trans_committed;
struct btrfs_super_block *super_copy;
u64 super_bytenr;
/* Only support one device yet */
struct btrfs_devvice *dev;
/* Cached block sizes */
u32 nodesize;
u32 sectorsize;
u32 stripesize;
};
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 *);

801
fs/btrfs/extent-io.c
View file

@ -5,9 +5,14 @@
* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
*/
#include "btrfs.h"
#include <linux/kernel.h>
#include <linux/bug.h>
#include <malloc.h>
#include <memalign.h>
#include "btrfs.h"
#include "ctree.h"
#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,
@ -124,3 +129,797 @@ err:
free(cbuf);
return -1ULL;
}
void extent_io_tree_init(struct extent_io_tree *tree)
{
cache_tree_init(&tree->state);
cache_tree_init(&tree->cache);
tree->cache_size = 0;
}
static struct extent_state *alloc_extent_state(void)
{
struct extent_state *state;
state = malloc(sizeof(*state));
if (!state)
return NULL;
state->cache_node.objectid = 0;
state->refs = 1;
state->state = 0;
state->xprivate = 0;
return state;
}
static void btrfs_free_extent_state(struct extent_state *state)
{
state->refs--;
BUG_ON(state->refs < 0);
if (state->refs == 0)
free(state);
}
static void free_extent_state_func(struct cache_extent *cache)
{
struct extent_state *es;
es = container_of(cache, struct extent_state, cache_node);
btrfs_free_extent_state(es);
}
static void free_extent_buffer_final(struct extent_buffer *eb);
void extent_io_tree_cleanup(struct extent_io_tree *tree)
{
cache_tree_free_extents(&tree->state, free_extent_state_func);
}
static inline void update_extent_state(struct extent_state *state)
{
state->cache_node.start = state->start;
state->cache_node.size = state->end + 1 - state->start;
}
/*
* Utility function to look for merge candidates inside a given range.
* Any extents with matching state are merged together into a single
* extent in the tree. Extents with EXTENT_IO in their state field are
* not merged
*/
static int merge_state(struct extent_io_tree *tree,
struct extent_state *state)
{
struct extent_state *other;
struct cache_extent *other_node;
if (state->state & EXTENT_IOBITS)
return 0;
other_node = prev_cache_extent(&state->cache_node);
if (other_node) {
other = container_of(other_node, struct extent_state,
cache_node);
if (other->end == state->start - 1 &&
other->state == state->state) {
state->start = other->start;
update_extent_state(state);
remove_cache_extent(&tree->state, &other->cache_node);
btrfs_free_extent_state(other);
}
}
other_node = next_cache_extent(&state->cache_node);
if (other_node) {
other = container_of(other_node, struct extent_state,
cache_node);
if (other->start == state->end + 1 &&
other->state == state->state) {
other->start = state->start;
update_extent_state(other);
remove_cache_extent(&tree->state, &state->cache_node);
btrfs_free_extent_state(state);
}
}
return 0;
}
/*
* insert an extent_state struct into the tree. 'bits' are set on the
* struct before it is inserted.
*/
static int insert_state(struct extent_io_tree *tree,
struct extent_state *state, u64 start, u64 end,
int bits)
{
int ret;
BUG_ON(end < start);
state->state |= bits;
state->start = start;
state->end = end;
update_extent_state(state);
ret = insert_cache_extent(&tree->state, &state->cache_node);
BUG_ON(ret);
merge_state(tree, state);
return 0;
}
/*
* split a given extent state struct in two, inserting the preallocated
* struct 'prealloc' as the newly created second half. 'split' indicates an
* offset inside 'orig' where it should be split.
*/
static int split_state(struct extent_io_tree *tree, struct extent_state *orig,
struct extent_state *prealloc, u64 split)
{
int ret;
prealloc->start = orig->start;
prealloc->end = split - 1;
prealloc->state = orig->state;
update_extent_state(prealloc);
orig->start = split;
update_extent_state(orig);
ret = insert_cache_extent(&tree->state, &prealloc->cache_node);
BUG_ON(ret);
return 0;
}
/*
* clear some bits on a range in the tree.
*/
static int clear_state_bit(struct extent_io_tree *tree,
struct extent_state *state, int bits)
{
int ret = state->state & bits;
state->state &= ~bits;
if (state->state == 0) {
remove_cache_extent(&tree->state, &state->cache_node);
btrfs_free_extent_state(state);
} else {
merge_state(tree, state);
}
return ret;
}
/*
* extent_buffer_bitmap_set - set an area of a bitmap
* @eb: the extent buffer
* @start: offset of the bitmap item in the extent buffer
* @pos: bit number of the first bit
* @len: number of bits to set
*/
void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
unsigned long pos, unsigned long len)
{
u8 *p = (u8 *)eb->data + start + BIT_BYTE(pos);
const unsigned int size = pos + len;
int bits_to_set = BITS_PER_BYTE - (pos % BITS_PER_BYTE);
u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(pos);
while (len >= bits_to_set) {
*p |= mask_to_set;
len -= bits_to_set;
bits_to_set = BITS_PER_BYTE;
mask_to_set = ~0;
p++;
}
if (len) {
mask_to_set &= BITMAP_LAST_BYTE_MASK(size);
*p |= mask_to_set;
}
}
/*
* extent_buffer_bitmap_clear - clear an area of a bitmap
* @eb: the extent buffer
* @start: offset of the bitmap item in the extent buffer
* @pos: bit number of the first bit
* @len: number of bits to clear
*/
void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
unsigned long pos, unsigned long len)
{
u8 *p = (u8 *)eb->data + start + BIT_BYTE(pos);
const unsigned int size = pos + len;
int bits_to_clear = BITS_PER_BYTE - (pos % BITS_PER_BYTE);
u8 mask_to_clear = BITMAP_FIRST_BYTE_MASK(pos);
while (len >= bits_to_clear) {
*p &= ~mask_to_clear;
len -= bits_to_clear;
bits_to_clear = BITS_PER_BYTE;
mask_to_clear = ~0;
p++;
}
if (len) {
mask_to_clear &= BITMAP_LAST_BYTE_MASK(size);
*p &= ~mask_to_clear;
}
}
/*
* clear some bits on a range in the tree.
*/
int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits)
{
struct extent_state *state;
struct extent_state *prealloc = NULL;
struct cache_extent *node;
u64 last_end;
int err;
int set = 0;
again:
if (!prealloc) {
prealloc = alloc_extent_state();
if (!prealloc)
return -ENOMEM;
}
/*
* this search will find the extents that end after
* our range starts
*/
node = search_cache_extent(&tree->state, start);
if (!node)
goto out;
state = container_of(node, struct extent_state, cache_node);
if (state->start > end)
goto out;
last_end = state->end;
/*
* | ---- desired range ---- |
* | state | or
* | ------------- state -------------- |
*
* We need to split the extent we found, and may flip
* bits on second half.
*
* If the extent we found extends past our range, we
* just split and search again. It'll get split again
* the next time though.
*
* If the extent we found is inside our range, we clear
* the desired bit on it.
*/
if (state->start < start) {
err = split_state(tree, state, prealloc, start);
BUG_ON(err == -EEXIST);
prealloc = NULL;
if (err)
goto out;
if (state->end <= end) {
set |= clear_state_bit(tree, state, bits);
if (last_end == (u64)-1)
goto out;
start = last_end + 1;
} else {
start = state->start;
}
goto search_again;
}
/*
* | ---- desired range ---- |
* | state |
* We need to split the extent, and clear the bit
* on the first half
*/
if (state->start <= end && state->end > end) {
err = split_state(tree, state, prealloc, end + 1);
BUG_ON(err == -EEXIST);
set |= clear_state_bit(tree, prealloc, bits);
prealloc = NULL;
goto out;
}
start = state->end + 1;
set |= clear_state_bit(tree, state, bits);
if (last_end == (u64)-1)
goto out;
start = last_end + 1;
goto search_again;
out:
if (prealloc)
btrfs_free_extent_state(prealloc);
return set;
search_again:
if (start > end)
goto out;
goto again;
}
/*
* set some bits on a range in the tree.
*/
int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits)
{
struct extent_state *state;
struct extent_state *prealloc = NULL;
struct cache_extent *node;
int err = 0;
u64 last_start;
u64 last_end;
again:
if (!prealloc) {
prealloc = alloc_extent_state();
if (!prealloc)
return -ENOMEM;
}
/*
* this search will find the extents that end after
* our range starts
*/
node = search_cache_extent(&tree->state, start);
if (!node) {
err = insert_state(tree, prealloc, start, end, bits);
BUG_ON(err == -EEXIST);
prealloc = NULL;
goto out;
}
state = container_of(node, struct extent_state, cache_node);
last_start = state->start;
last_end = state->end;
/*
* | ---- desired range ---- |
* | state |
*
* Just lock what we found and keep going
*/
if (state->start == start && state->end <= end) {
state->state |= bits;
merge_state(tree, state);
if (last_end == (u64)-1)
goto out;
start = last_end + 1;
goto search_again;
}
/*
* | ---- desired range ---- |
* | state |
* or
* | ------------- state -------------- |
*
* We need to split the extent we found, and may flip bits on
* second half.
*
* If the extent we found extends past our
* range, we just split and search again. It'll get split
* again the next time though.
*
* If the extent we found is inside our range, we set the
* desired bit on it.
*/
if (state->start < start) {
err = split_state(tree, state, prealloc, start);
BUG_ON(err == -EEXIST);
prealloc = NULL;
if (err)
goto out;
if (state->end <= end) {
state->state |= bits;
start = state->end + 1;
merge_state(tree, state);
if (last_end == (u64)-1)
goto out;
start = last_end + 1;
} else {
start = state->start;
}
goto search_again;
}
/*
* | ---- desired range ---- |
* | state | or | state |
*
* There's a hole, we need to insert something in it and
* ignore the extent we found.
*/
if (state->start > start) {
u64 this_end;
if (end < last_start)
this_end = end;
else
this_end = last_start -1;
err = insert_state(tree, prealloc, start, this_end,
bits);
BUG_ON(err == -EEXIST);
prealloc = NULL;
if (err)
goto out;
start = this_end + 1;
goto search_again;
}
/*
* | ---- desired range ---- |
* | ---------- state ---------- |
* We need to split the extent, and set the bit
* on the first half
*/
err = split_state(tree, state, prealloc, end + 1);
BUG_ON(err == -EEXIST);
state->state |= bits;
merge_state(tree, prealloc);
prealloc = NULL;
out:
if (prealloc)
btrfs_free_extent_state(prealloc);
return err;
search_again:
if (start > end)
goto out;
goto again;
}
int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end)
{
return set_extent_bits(tree, start, end, EXTENT_DIRTY);
}
int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end)
{
return clear_extent_bits(tree, start, end, EXTENT_DIRTY);
}
int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
u64 *start_ret, u64 *end_ret, int bits)
{
struct cache_extent *node;
struct extent_state *state;
int ret = 1;
/*
* this search will find all the extents that end after
* our range starts.
*/
node = search_cache_extent(&tree->state, start);
if (!node)
goto out;
while(1) {
state = container_of(node, struct extent_state, cache_node);
if (state->end >= start && (state->state & bits)) {
*start_ret = state->start;
*end_ret = state->end;
ret = 0;
break;
}
node = next_cache_extent(node);
if (!node)
break;
}
out:
return ret;
}
int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
int bits, int filled)
{
struct extent_state *state = NULL;
struct cache_extent *node;
int bitset = 0;
node = search_cache_extent(&tree->state, start);
while (node && start <= end) {
state = container_of(node, struct extent_state, cache_node);
if (filled && state->start > start) {
bitset = 0;
break;
}
if (state->start > end)
break;
if (state->state & bits) {
bitset = 1;
if (!filled)
break;
} else if (filled) {
bitset = 0;
break;
}
start = state->end + 1;
if (start > end)
break;
node = next_cache_extent(node);
if (!node) {
if (filled)
bitset = 0;
break;
}
}
return bitset;
}
int set_state_private(struct extent_io_tree *tree, u64 start, u64 private)
{
struct cache_extent *node;
struct extent_state *state;
int ret = 0;
node = search_cache_extent(&tree->state, start);
if (!node) {
ret = -ENOENT;
goto out;
}
state = container_of(node, struct extent_state, cache_node);
if (state->start != start) {
ret = -ENOENT;
goto out;
}
state->xprivate = private;
out:
return ret;
}
int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private)
{
struct cache_extent *node;
struct extent_state *state;
int ret = 0;
node = search_cache_extent(&tree->state, start);
if (!node) {
ret = -ENOENT;
goto out;
}
state = container_of(node, struct extent_state, cache_node);
if (state->start != start) {
ret = -ENOENT;
goto out;
}
*private = state->xprivate;
out:
return ret;
}
static struct extent_buffer *__alloc_extent_buffer(struct btrfs_fs_info *info,
u64 bytenr, u32 blocksize)
{
struct extent_buffer *eb;
eb = calloc(1, sizeof(struct extent_buffer));
if (!eb)
return NULL;
eb->data = malloc_cache_aligned(blocksize);
if (!eb->data) {
free(eb);
return NULL;
}
eb->start = bytenr;
eb->len = blocksize;
eb->refs = 1;
eb->flags = 0;
eb->cache_node.start = bytenr;
eb->cache_node.size = blocksize;
eb->fs_info = info;
memset_extent_buffer(eb, 0, 0, blocksize);
return eb;
}
struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src)
{
struct extent_buffer *new;
new = __alloc_extent_buffer(src->fs_info, src->start, src->len);
if (!new)
return NULL;
copy_extent_buffer(new, src, 0, 0, src->len);
new->flags |= EXTENT_BUFFER_DUMMY;
return new;
}
static void free_extent_buffer_final(struct extent_buffer *eb)
{
BUG_ON(eb->refs);
if (!(eb->flags & EXTENT_BUFFER_DUMMY)) {
struct extent_io_tree *tree = &eb->fs_info->extent_cache;
remove_cache_extent(&tree->cache, &eb->cache_node);
BUG_ON(tree->cache_size < eb->len);
tree->cache_size -= eb->len;
}
free(eb->data);
free(eb);
}
static void free_extent_buffer_internal(struct extent_buffer *eb, bool free_now)
{
if (!eb || IS_ERR(eb))
return;
eb->refs--;
BUG_ON(eb->refs < 0);
if (eb->refs == 0) {
if (eb->flags & EXTENT_DIRTY) {
error(
"dirty eb leak (aborted trans): start %llu len %u",
eb->start, eb->len);
}
if (eb->flags & EXTENT_BUFFER_DUMMY || free_now)
free_extent_buffer_final(eb);
}
}
void free_extent_buffer(struct extent_buffer *eb)
{
free_extent_buffer_internal(eb, 1);
}
struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
u64 bytenr, u32 blocksize)
{
struct extent_buffer *eb = NULL;
struct cache_extent *cache;
cache = lookup_cache_extent(&tree->cache, bytenr, blocksize);
if (cache && cache->start == bytenr &&
cache->size == blocksize) {
eb = container_of(cache, struct extent_buffer, cache_node);
eb->refs++;
}
return eb;
}
struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree,
u64 start)
{
struct extent_buffer *eb = NULL;
struct cache_extent *cache;
cache = search_cache_extent(&tree->cache, start);
if (cache) {
eb = container_of(cache, struct extent_buffer, cache_node);
eb->refs++;
}
return eb;
}
struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
u64 bytenr, u32 blocksize)
{
struct extent_buffer *eb;
struct extent_io_tree *tree = &fs_info->extent_cache;
struct cache_extent *cache;
cache = lookup_cache_extent(&tree->cache, bytenr, blocksize);
if (cache && cache->start == bytenr &&
cache->size == blocksize) {
eb = container_of(cache, struct extent_buffer, cache_node);
eb->refs++;
} else {
int ret;
if (cache) {
eb = container_of(cache, struct extent_buffer,
cache_node);
free_extent_buffer(eb);
}
eb = __alloc_extent_buffer(fs_info, bytenr, blocksize);
if (!eb)
return NULL;
ret = insert_cache_extent(&tree->cache, &eb->cache_node);
if (ret) {
free(eb);
return NULL;
}
tree->cache_size += blocksize;
}
return eb;
}
/*
* Allocate a dummy extent buffer which won't be inserted into extent buffer
* cache.
*
* This mostly allows super block read write using existing eb infrastructure
* without pulluting the eb cache.
*
* This is especially important to avoid injecting eb->start == SZ_64K, as
* fuzzed image could have invalid tree bytenr covers super block range,
* and cause ref count underflow.
*/
struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
u64 bytenr, u32 blocksize)
{
struct extent_buffer *ret;
ret = __alloc_extent_buffer(fs_info, bytenr, blocksize);
if (!ret)
return NULL;
ret->flags |= EXTENT_BUFFER_DUMMY;
return ret;
}
int read_extent_from_disk(struct blk_desc *desc, struct disk_partition *part,
u64 physical, struct extent_buffer *eb,
unsigned long offset, unsigned long len)
{
int ret;
ret = __btrfs_devread(desc, part, eb->data + offset, len, physical);
if (ret < 0)
goto out;
if (ret != len) {
ret = -EIO;
goto out;
}
ret = 0;
out:
return ret;
}
int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
unsigned long start, unsigned long len)
{
return memcmp(eb->data + start, ptrv, len);
}
void read_extent_buffer(const struct extent_buffer *eb, void *dst,
unsigned long start, unsigned long len)
{
memcpy(dst, eb->data + start, len);
}
void write_extent_buffer(struct extent_buffer *eb, const void *src,
unsigned long start, unsigned long len)
{
memcpy(eb->data + start, src, len);
}
void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
unsigned long dst_offset, unsigned long src_offset,
unsigned long len)
{
memcpy(dst->data + dst_offset, src->data + src_offset, len);
}
void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
unsigned long src_offset, unsigned long len)
{
memmove(dst->data + dst_offset, dst->data + src_offset, len);
}
void memset_extent_buffer(struct extent_buffer *eb, char c,
unsigned long start, unsigned long len)
{
memset(eb->data + start, c, len);
}
int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
unsigned long nr)
{
return le_test_bit(nr, (u8 *)eb->data + start);
}
int set_extent_buffer_dirty(struct extent_buffer *eb)
{
struct extent_io_tree *tree = &eb->fs_info->extent_cache;
if (!(eb->flags & EXTENT_DIRTY)) {
eb->flags |= EXTENT_DIRTY;
set_extent_dirty(tree, eb->start, eb->start + eb->len - 1);
extent_buffer_get(eb);
}
return 0;
}
int clear_extent_buffer_dirty(struct extent_buffer *eb)
{
struct extent_io_tree *tree = &eb->fs_info->extent_cache;
if (eb->flags & EXTENT_DIRTY) {
eb->flags &= ~EXTENT_DIRTY;
clear_extent_dirty(tree, eb->start, eb->start + eb->len - 1);
free_extent_buffer(eb);
}
return 0;
}

164
fs/btrfs/extent-io.h Normal file
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// SPDX-License-Identifier: GPL-2.0+
/*
* Crossported from btrfs-progs/extent_io.h
*
* Modification includes:
* - extent_buffer:data
* Use pointer to provide better alignment.
* - Remove max_cache_size related interfaces
* Includes free_extent_buffer_nocache()
* As we don't cache eb in U-boot.
* - Include headers
*
* Write related functions are kept as we still need to modify dummy extent
* buffers even in RO environment.
*/
#ifndef __BTRFS_EXTENT_IO_H__
#define __BTRFS_EXTENT_IO_H__
#include <linux/types.h>
#include <linux/list.h>
#include <linux/err.h>
#include <linux/bitops.h>
#include <fs_internal.h>
#include "extent-cache.h"
#define EXTENT_DIRTY (1U << 0)
#define EXTENT_WRITEBACK (1U << 1)
#define EXTENT_UPTODATE (1U << 2)
#define EXTENT_LOCKED (1U << 3)
#define EXTENT_NEW (1U << 4)
#define EXTENT_DELALLOC (1U << 5)
#define EXTENT_DEFRAG (1U << 6)
#define EXTENT_DEFRAG_DONE (1U << 7)
#define EXTENT_BUFFER_FILLED (1U << 8)
#define EXTENT_CSUM (1U << 9)
#define EXTENT_BAD_TRANSID (1U << 10)
#define EXTENT_BUFFER_DUMMY (1U << 11)
#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
#define BLOCK_GROUP_DATA (1U << 1)
#define BLOCK_GROUP_METADATA (1U << 2)
#define BLOCK_GROUP_SYSTEM (1U << 4)
/*
* The extent buffer bitmap operations are done with byte granularity instead of
* word granularity for two reasons:
* 1. The bitmaps must be little-endian on disk.
* 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
* single word in a bitmap may straddle two pages in the extent buffer.
*/
#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
#define BITMAP_FIRST_BYTE_MASK(start) \
((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
#define BITMAP_LAST_BYTE_MASK(nbits) \
(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
static inline int le_test_bit(int nr, const u8 *addr)
{
return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1)));
}
struct btrfs_fs_info;
struct extent_io_tree {
struct cache_tree state;
struct cache_tree cache;
u64 cache_size;
};
struct extent_state {
struct cache_extent cache_node;
u64 start;
u64 end;
int refs;
unsigned long state;
u64 xprivate;
};
struct extent_buffer {
struct cache_extent cache_node;
u64 start;
u32 len;
int refs;
u32 flags;
struct btrfs_fs_info *fs_info;
char *data;
};
static inline void extent_buffer_get(struct extent_buffer *eb)
{
eb->refs++;
}
void extent_io_tree_init(struct extent_io_tree *tree);
void extent_io_tree_cleanup(struct extent_io_tree *tree);
int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits);
int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits);
int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
u64 *start_ret, u64 *end_ret, int bits);
int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
int bits, int filled);
int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end);
int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end);
static inline int set_extent_buffer_uptodate(struct extent_buffer *eb)
{
eb->flags |= EXTENT_UPTODATE;
return 0;
}
static inline int clear_extent_buffer_uptodate(struct extent_buffer *eb)
{
eb->flags &= ~EXTENT_UPTODATE;
return 0;
}
static inline int extent_buffer_uptodate(struct extent_buffer *eb)
{
if (!eb || IS_ERR(eb))
return 0;
if (eb->flags & EXTENT_UPTODATE)
return 1;
return 0;
}
int set_state_private(struct extent_io_tree *tree, u64 start, u64 xprivate);
int get_state_private(struct extent_io_tree *tree, u64 start, u64 *xprivate);
struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
u64 bytenr, u32 blocksize);
struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree,
u64 start);
struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
u64 bytenr, u32 blocksize);
struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
u64 bytenr, u32 blocksize);
void free_extent_buffer(struct extent_buffer *eb);
int read_extent_from_disk(struct blk_desc *desc, struct disk_partition *part,
u64 physical, struct extent_buffer *eb,
unsigned long offset, unsigned long len);
int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
unsigned long start, unsigned long len);
void read_extent_buffer(const struct extent_buffer *eb, void *dst,
unsigned long start, unsigned long len);
void write_extent_buffer(struct extent_buffer *eb, const void *src,
unsigned long start, unsigned long len);
void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
unsigned long dst_offset, unsigned long src_offset,
unsigned long len);
void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
unsigned long src_offset, unsigned long len);
void memset_extent_buffer(struct extent_buffer *eb, char c,
unsigned long start, unsigned long len);
int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
unsigned long nr);
int set_extent_buffer_dirty(struct extent_buffer *eb);
int clear_extent_buffer_dirty(struct extent_buffer *eb);
void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
unsigned long pos, unsigned long len);
void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
unsigned long pos, unsigned long len);
#endif