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btrfs-progs: convert: Introduce function to read out btrfs reserved range

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Introduce a new function, read_reserved_ranges(), to allow later
rollback to use these data to do rollback.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
This commit is contained in:
Qu Wenruo 2017-02-23 15:17:16 +08:00 committed by David Sterba
parent 5613d32e75
commit b82b12265b
1 changed files with 30 additions and 0 deletions
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30
convert/main.c
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@ -1513,6 +1513,36 @@ fail:
return -1;
}
/*
* Read out data of convert image which is in btrfs reserved ranges so we can
* use them to overwrite the ranges during rollback.
*/
static int read_reserved_ranges(struct btrfs_root *root, u64 ino,
u64 total_bytes, char *reserved_ranges[])
{
int i;
int ret = 0;
for (i = 0; i < ARRAY_SIZE(btrfs_reserved_ranges); i++) {
struct simple_range *range = &btrfs_reserved_ranges[i];
if (range->start + range->len >= total_bytes)
break;
ret = btrfs_read_file(root, ino, range->start, range->len,
reserved_ranges[i]);
if (ret < range->len) {
error(
"failed to read data of convert image, offset=%llu len=%llu ret=%d",
range->start, range->len, ret);
if (ret >= 0)
ret = -EIO;
break;
}
ret = 0;
}
return ret;
}
static int do_rollback(const char *devname)
{
int fd = -1;