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btrfs-progs: qgroup: use btrfs_open_dir for btrfs qgroup command

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We can use btrfs_open_dir() to check whether target dir is
in btrfs's mount point before open, instead of checking it in
kernel space of ioctl, and return fuzzy error message.

Before patch:
  # ./btrfs qgroup create 1/5  /mnt/tmp1
  ERROR: unable to create quota group: Inappropriate ioctl for device
  #
  # ./btrfs qgroup assign 1/5 2/5 /mnt/tmp1
  ERROR: unable to assign quota group: Inappropriate ioctl for device
  #
  # ./btrfs qgroup show /mnt/tmp1
  ERROR: can't perform the search - Inappropriate ioctl for device
  ERROR: can't list qgroups: Inappropriate ioctl for device
  #
  # ./btrfs qgroup limit 1G 1/5  /mnt/tmp1
  ERROR: unable to limit requested quota group: Inappropriate ioctl for device

After patch:
  # ./btrfs qgroup create 1/5 /mnt/tmp1
  ERROR: not a btrfs filesystem: /mnt/tmp1
  # ./btrfs qgroup assign 1/5 2/5 /mnt/tmp1
  ERROR: not a btrfs filesystem: /mnt/tmp1
  # ./btrfs qgroup show /mnt/tmp1
  ERROR: not a btrfs filesystem: /mnt/tmp1
  # ./btrfs qgroup limit 1G 1/5 /mnt/tmp1
  ERROR: not a btrfs filesystem: /mnt/tmp1

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Zhao Lei 2015-10-12 21:23:00 +08:00 committed by David Sterba
parent 7c2bad665e
commit bbbe7fd7d0
1 changed files with 8 additions and 16 deletions
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24
cmds-qgroup.c
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@ -79,11 +79,9 @@ static int qgroup_assign(int assign, int argc, char **argv)
fprintf(stderr, "ERROR: bad relation requested '%s'\n", path);
return 1;
}
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
return 1;
}
ret = ioctl(fd, BTRFS_IOC_QGROUP_ASSIGN, &args);
e = errno;
@ -137,11 +135,9 @@ static int qgroup_create(int create, int argc, char **argv)
args.create = create;
args.qgroupid = parse_qgroupid(argv[1]);
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
return 1;
}
ret = ioctl(fd, BTRFS_IOC_QGROUP_CREATE, &args);
e = errno;
@ -351,11 +347,9 @@ static int cmd_qgroup_show(int argc, char **argv)
usage(cmd_qgroup_show_usage);
path = argv[optind];
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
return 1;
}
if (filter_flag) {
qgroupid = btrfs_get_path_rootid(fd);
@ -460,11 +454,9 @@ static int cmd_qgroup_limit(int argc, char **argv)
} else
usage(cmd_qgroup_limit_usage);
fd = open_file_or_dir(path, &dirstream);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access '%s'\n", path);
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
return 1;
}
ret = ioctl(fd, BTRFS_IOC_QGROUP_LIMIT, &args);
e = errno;