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Btrfs-progs: map-logical: introduce write_extent_content function

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This function will write extent content info desired file.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Qu Wenruo 2015-06-17 15:49:03 +08:00 committed by David Sterba
parent 1e28ed2f84
commit 1bbd40a1bb
1 changed files with 34 additions and 0 deletions
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34
btrfs-map-logical.c
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@ -30,6 +30,8 @@
#include "list.h"
#include "utils.h"
#define BUFFER_SIZE (64 * 1024)
/* we write the mirror info to stdout unless they are dumping the data
* to stdout
* */
@ -156,6 +158,38 @@ static int print_mapping_info(struct btrfs_fs_info *fs_info, u64 logical,
return ret;
}
/* Same requisition as print_mapping_info function */
static int write_extent_content(struct btrfs_fs_info *fs_info, int out_fd,
u64 logical, u64 length, int mirror)
{
char buffer[BUFFER_SIZE];
u64 cur_offset = 0;
u64 cur_len;
int ret = 0;
while (cur_offset < length) {
cur_len = min_t(u64, length - cur_offset, BUFFER_SIZE);
ret = read_extent_data(fs_info->tree_root, buffer,
logical + cur_offset, &cur_len, mirror);
if (ret < 0) {
fprintf(stderr,
"Failed to read extent at [%llu, %llu]: %s\n",
logical, logical + length, strerror(-ret));
return ret;
}
ret = write(out_fd, buffer, cur_len);
if (ret < 0 || ret != cur_len) {
if (ret > 0)
ret = -EINTR;
fprintf(stderr, "output file write failed: %s\n",
strerror(-ret));
return ret;
}
cur_offset += cur_len;
}
return ret;
}
static struct extent_buffer * debug_read_block(struct btrfs_root *root,
u64 bytenr, u32 blocksize, u64 copy)
{