The BTRFS_IOC_RESIZE ioctl returns 0 on success, negative for POSIX
errors, and positive for btrfs-specific errors.
If resize fails with a btrfs-specific error, decode the error and
report it. If we can't decode the error, report its numeric value so
that the userspace tool is not instantly useless when a new error code
is defined in the kernel.
Exit with non-zero status on any resize error. This is very important
for scripts that will shrink the underlying storage when btrfs reports
success!
---
cmds-filesystem.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/cmds-filesystem.c b/cmds-filesystem.c
index f3fc160..85f0406 100644
--- a/cmds-filesystem.c
+++ b/cmds-filesystem.c
@@ -1263,6 +1263,16 @@ static int cmd_resize(int argc, char **argv)
fprintf(stderr, "ERROR: unable to resize '%s' - %s\n",
path, strerror(e));
return 1;
+ } else if (res > 0) {
+ const char *err_str = btrfs_err_str(res);
+ if (err_str) {
+ fprintf(stderr, "ERROR: btrfs error resizing '%s' - %s\n",
+ path, err_str);
+ } else {
+ fprintf(stderr, "ERROR: btrfs error resizing '%s' - unknown btrfs_err_code %d\n",
+ path, res);
+ }
+ return 1;
}
return 0;
}
--
1.7.10.4
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