mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-15 19:05:50 +00:00
c0f32c54a3
Offline btrfs tools, like btrfs-image, will infinitely loop when there is missing device. The reason is, for missing device, it's fd will be set to -1, but before we reading, we only check the fd validation by checking if it's 0. So in that case, -1 will pass the validation check, and cause pread to return 0, and loop to read. Just change the validation check from "== 0" to "<= 0" to avoid such problem. Reported-by: Timothy Normand Miller <theosib@gmail.com> Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.com>
888 lines
20 KiB
C
888 lines
20 KiB
C
|
|
/*
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License v2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public
|
|
* License along with this program; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 021110-1307, USA.
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include "kerncompat.h"
|
|
#include "extent_io.h"
|
|
#include "list.h"
|
|
#include "ctree.h"
|
|
#include "volumes.h"
|
|
|
|
void extent_io_tree_init(struct extent_io_tree *tree)
|
|
{
|
|
cache_tree_init(&tree->state);
|
|
cache_tree_init(&tree->cache);
|
|
INIT_LIST_HEAD(&tree->lru);
|
|
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);
|
|
}
|
|
|
|
void extent_io_tree_cleanup(struct extent_io_tree *tree)
|
|
{
|
|
struct extent_buffer *eb;
|
|
|
|
while(!list_empty(&tree->lru)) {
|
|
eb = list_entry(tree->lru.next, struct extent_buffer, lru);
|
|
fprintf(stderr, "extent buffer leak: "
|
|
"start %llu len %u\n",
|
|
(unsigned long long)eb->start, eb->len);
|
|
free_extent_buffer(eb);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* clear some bits on a range in the tree.
|
|
*/
|
|
int clear_extent_bits(struct extent_io_tree *tree, u64 start,
|
|
u64 end, int bits, gfp_t mask)
|
|
{
|
|
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, gfp_t mask)
|
|
{
|
|
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,
|
|
gfp_t mask)
|
|
{
|
|
return set_extent_bits(tree, start, end, EXTENT_DIRTY, mask);
|
|
}
|
|
|
|
int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
|
|
gfp_t mask)
|
|
{
|
|
return clear_extent_bits(tree, start, end, EXTENT_DIRTY, mask);
|
|
}
|
|
|
|
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 extent_io_tree *tree,
|
|
u64 bytenr, u32 blocksize)
|
|
{
|
|
struct extent_buffer *eb;
|
|
|
|
eb = malloc(sizeof(struct extent_buffer) + blocksize);
|
|
if (!eb) {
|
|
BUG();
|
|
return NULL;
|
|
}
|
|
memset(eb, 0, sizeof(struct extent_buffer) + blocksize);
|
|
|
|
eb->start = bytenr;
|
|
eb->len = blocksize;
|
|
eb->refs = 1;
|
|
eb->flags = 0;
|
|
eb->tree = tree;
|
|
eb->fd = -1;
|
|
eb->dev_bytenr = (u64)-1;
|
|
eb->cache_node.start = bytenr;
|
|
eb->cache_node.size = blocksize;
|
|
INIT_LIST_HEAD(&eb->recow);
|
|
|
|
return eb;
|
|
}
|
|
|
|
struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src)
|
|
{
|
|
struct extent_buffer *new;
|
|
|
|
new = __alloc_extent_buffer(NULL, src->start, src->len);
|
|
if (new == NULL)
|
|
return NULL;
|
|
|
|
copy_extent_buffer(new, src, 0, 0, src->len);
|
|
new->flags |= EXTENT_BUFFER_DUMMY;
|
|
|
|
return new;
|
|
}
|
|
|
|
void free_extent_buffer(struct extent_buffer *eb)
|
|
{
|
|
if (!eb || IS_ERR(eb))
|
|
return;
|
|
|
|
eb->refs--;
|
|
BUG_ON(eb->refs < 0);
|
|
if (eb->refs == 0) {
|
|
struct extent_io_tree *tree = eb->tree;
|
|
BUG_ON(eb->flags & EXTENT_DIRTY);
|
|
list_del_init(&eb->lru);
|
|
list_del_init(&eb->recow);
|
|
if (!(eb->flags & EXTENT_BUFFER_DUMMY)) {
|
|
BUG_ON(tree->cache_size < eb->len);
|
|
remove_cache_extent(&tree->cache, &eb->cache_node);
|
|
tree->cache_size -= eb->len;
|
|
}
|
|
free(eb);
|
|
}
|
|
}
|
|
|
|
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);
|
|
list_move_tail(&eb->lru, &tree->lru);
|
|
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);
|
|
list_move_tail(&eb->lru, &tree->lru);
|
|
eb->refs++;
|
|
}
|
|
return eb;
|
|
}
|
|
|
|
struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
|
|
u64 bytenr, u32 blocksize)
|
|
{
|
|
struct extent_buffer *eb;
|
|
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);
|
|
list_move_tail(&eb->lru, &tree->lru);
|
|
eb->refs++;
|
|
} else {
|
|
int ret;
|
|
|
|
if (cache) {
|
|
eb = container_of(cache, struct extent_buffer,
|
|
cache_node);
|
|
free_extent_buffer(eb);
|
|
}
|
|
eb = __alloc_extent_buffer(tree, bytenr, blocksize);
|
|
if (!eb)
|
|
return NULL;
|
|
ret = insert_cache_extent(&tree->cache, &eb->cache_node);
|
|
if (ret) {
|
|
free(eb);
|
|
return NULL;
|
|
}
|
|
list_add_tail(&eb->lru, &tree->lru);
|
|
tree->cache_size += blocksize;
|
|
}
|
|
return eb;
|
|
}
|
|
|
|
int read_extent_from_disk(struct extent_buffer *eb,
|
|
unsigned long offset, unsigned long len)
|
|
{
|
|
int ret;
|
|
ret = pread(eb->fd, eb->data + offset, len, eb->dev_bytenr);
|
|
if (ret < 0) {
|
|
ret = -errno;
|
|
goto out;
|
|
}
|
|
if (ret != len) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int write_extent_to_disk(struct extent_buffer *eb)
|
|
{
|
|
int ret;
|
|
ret = pwrite(eb->fd, eb->data, eb->len, eb->dev_bytenr);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret != eb->len) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int read_data_from_disk(struct btrfs_fs_info *info, void *buf, u64 offset,
|
|
u64 bytes, int mirror)
|
|
{
|
|
struct btrfs_multi_bio *multi = NULL;
|
|
struct btrfs_device *device;
|
|
u64 bytes_left = bytes;
|
|
u64 read_len;
|
|
u64 total_read = 0;
|
|
int ret;
|
|
|
|
while (bytes_left) {
|
|
read_len = bytes_left;
|
|
ret = btrfs_map_block(&info->mapping_tree, READ, offset,
|
|
&read_len, &multi, mirror, NULL);
|
|
if (ret) {
|
|
fprintf(stderr, "Couldn't map the block %Lu\n",
|
|
offset);
|
|
return -EIO;
|
|
}
|
|
device = multi->stripes[0].dev;
|
|
|
|
read_len = min(bytes_left, read_len);
|
|
if (device->fd <= 0) {
|
|
kfree(multi);
|
|
return -EIO;
|
|
}
|
|
|
|
ret = pread(device->fd, buf + total_read, read_len,
|
|
multi->stripes[0].physical);
|
|
kfree(multi);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "Error reading %Lu, %d\n", offset,
|
|
ret);
|
|
return ret;
|
|
}
|
|
if (ret != read_len) {
|
|
fprintf(stderr, "Short read for %Lu, read %d, "
|
|
"read_len %Lu\n", offset, ret, read_len);
|
|
return -EIO;
|
|
}
|
|
|
|
bytes_left -= read_len;
|
|
offset += read_len;
|
|
total_read += read_len;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int write_data_to_disk(struct btrfs_fs_info *info, void *buf, u64 offset,
|
|
u64 bytes, int mirror)
|
|
{
|
|
struct btrfs_multi_bio *multi = NULL;
|
|
struct btrfs_device *device;
|
|
u64 bytes_left = bytes;
|
|
u64 this_len;
|
|
u64 total_write = 0;
|
|
u64 *raid_map = NULL;
|
|
u64 dev_bytenr;
|
|
int dev_nr;
|
|
int ret = 0;
|
|
|
|
while (bytes_left > 0) {
|
|
this_len = bytes_left;
|
|
dev_nr = 0;
|
|
|
|
ret = btrfs_map_block(&info->mapping_tree, WRITE, offset,
|
|
&this_len, &multi, mirror, &raid_map);
|
|
if (ret) {
|
|
fprintf(stderr, "Couldn't map the block %Lu\n",
|
|
offset);
|
|
return -EIO;
|
|
}
|
|
|
|
if (raid_map) {
|
|
struct extent_buffer *eb;
|
|
u64 stripe_len = this_len;
|
|
|
|
this_len = min(this_len, bytes_left);
|
|
this_len = min(this_len, (u64)info->tree_root->leafsize);
|
|
|
|
eb = malloc(sizeof(struct extent_buffer) + this_len);
|
|
BUG_ON(!eb);
|
|
|
|
memset(eb, 0, sizeof(struct extent_buffer) + this_len);
|
|
eb->start = offset;
|
|
eb->len = this_len;
|
|
|
|
memcpy(eb->data, buf + total_write, this_len);
|
|
ret = write_raid56_with_parity(info, eb, multi,
|
|
stripe_len, raid_map);
|
|
BUG_ON(ret);
|
|
|
|
free(eb);
|
|
kfree(raid_map);
|
|
raid_map = NULL;
|
|
} else while (dev_nr < multi->num_stripes) {
|
|
device = multi->stripes[dev_nr].dev;
|
|
if (device->fd <= 0) {
|
|
kfree(multi);
|
|
return -EIO;
|
|
}
|
|
|
|
dev_bytenr = multi->stripes[dev_nr].physical;
|
|
this_len = min(this_len, bytes_left);
|
|
dev_nr++;
|
|
|
|
ret = pwrite(device->fd, buf + total_write, this_len, dev_bytenr);
|
|
if (ret != this_len) {
|
|
if (ret < 0) {
|
|
fprintf(stderr, "Error writing to "
|
|
"device %d\n", errno);
|
|
ret = errno;
|
|
kfree(multi);
|
|
return ret;
|
|
} else {
|
|
fprintf(stderr, "Short write\n");
|
|
kfree(multi);
|
|
return -EIO;
|
|
}
|
|
}
|
|
}
|
|
|
|
BUG_ON(bytes_left < this_len);
|
|
|
|
bytes_left -= this_len;
|
|
offset += this_len;
|
|
total_write += this_len;
|
|
|
|
kfree(multi);
|
|
multi = NULL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int set_extent_buffer_dirty(struct extent_buffer *eb)
|
|
{
|
|
struct extent_io_tree *tree = eb->tree;
|
|
if (!(eb->flags & EXTENT_DIRTY)) {
|
|
eb->flags |= EXTENT_DIRTY;
|
|
set_extent_dirty(tree, eb->start, eb->start + eb->len - 1, 0);
|
|
extent_buffer_get(eb);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int clear_extent_buffer_dirty(struct extent_buffer *eb)
|
|
{
|
|
struct extent_io_tree *tree = eb->tree;
|
|
if (eb->flags & EXTENT_DIRTY) {
|
|
eb->flags &= ~EXTENT_DIRTY;
|
|
clear_extent_dirty(tree, eb->start, eb->start + eb->len - 1, 0);
|
|
free_extent_buffer(eb);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
|
|
unsigned long start, unsigned long len)
|
|
{
|
|
return memcmp(eb->data + start, ptrv, len);
|
|
}
|
|
|
|
void read_extent_buffer(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);
|
|
}
|