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btrfs-progs: convert: Make read_disk_extent return more -EIO instead of -1

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When pread64() returns value smaller than expected, it normally means
EIO, so just return -EIO to replace the intermediate number.  So when IO
fails, we should be able to get more meaningful error number of than
EPERM.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2018-09-14 15:25:04 +08:00 committed by David Sterba
parent 251d32ea5c
commit 6a659dbfde
1 changed files with 1 additions and 1 deletions
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convert/source-fs.c
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@ -201,7 +201,7 @@ int read_disk_extent(struct btrfs_root *root, u64 bytenr,
ret = 0;
fail:
if (ret > 0)
ret = -1;
ret = -EIO;
return ret;
}