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btrfs-progs: use btrfs_open_dir for btrfs device command

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We can use btrfs_open_dir() to check whether the target dir is
under btrfs mount point before openning, instead of checking it in kernel
through ioctl, and returning a  fuzzy error message.

Before patch:
  # (/mnt/tmp is not btrfs mountpoint)
  #
  # btrfs device add -f /dev/sda13 /mnt/tmp
  ERROR: error adding the device '/dev/sda13' - Inappropriate ioctl for device
  #

After patch:
  # btrfs device add -f /dev/sda13 /mnt/tmp
  ERROR: not btrfs filesystem: /mnt/tmp
  #

Similar fix for device remove and device usage.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
[renamed to btrfs_open_dir]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Zhao Lei 2015-08-26 17:04:23 +08:00 committed by David Sterba
parent 87c25626c4
commit abe48ca860
1 changed files with 5 additions and 11 deletions
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16
cmds-device.c
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@ -84,11 +84,9 @@ static int cmd_device_add(int argc, char **argv)
mntpnt = argv[optind + argc - 1];
fdmnt = open_file_or_dir(mntpnt, &dirstream);
if (fdmnt < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", mntpnt);
fdmnt = btrfs_open_dir(mntpnt, &dirstream, 1);
if (fdmnt < 0)
return 1;
}
for (i = optind; i < optind + argc - 1; i++){
struct btrfs_ioctl_vol_args ioctl_args;
@ -157,11 +155,9 @@ static int _cmd_device_remove(int argc, char **argv,
mntpnt = argv[argc - 1];
fdmnt = open_file_or_dir(mntpnt, &dirstream);
if (fdmnt < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", mntpnt);
fdmnt = btrfs_open_dir(mntpnt, &dirstream, 1);
if (fdmnt < 0)
return 1;
}
for(i=1 ; i < argc - 1; i++ ){
struct btrfs_ioctl_vol_args arg;
@ -588,10 +584,8 @@ int cmd_device_usage(int argc, char **argv)
if (more_than_one)
printf("\n");
fd = open_file_or_dir(argv[i], &dirstream);
fd = btrfs_open_dir(argv[i], &dirstream, 1);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n",
argv[1]);
ret = 1;
goto out;
}