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btrfs-progs: balance: use btrfs_open_dir for btrfs balance 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 balance start /mnt/tmp
  ERROR: error during balancing '/mnt/tmp' - Inappropriate ioctl for device
  There may be more info in syslog - try dmesg | tail
  #

After patch:
  # btrfs balance start /mnt/tmp
  ERROR: not btrfs filesystem: /mnt/tmp
  #

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 21:22:56 +08:00 committed by David Sterba
parent d0c0f90b38
commit 45401669b0
1 changed files with 10 additions and 20 deletions
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30
cmds-balance.c
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@ -306,11 +306,9 @@ static int do_balance(const char *path, struct btrfs_ioctl_balance_args *args,
int e;
DIR *dirstream = NULL;
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_BALANCE_V2, args);
e = errno;
@ -503,11 +501,9 @@ static int cmd_balance_pause(int argc, char **argv)
path = 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_BALANCE_CTL, BTRFS_BALANCE_CTL_PAUSE);
e = errno;
@ -544,11 +540,9 @@ static int cmd_balance_cancel(int argc, char **argv)
path = 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_BALANCE_CTL, BTRFS_BALANCE_CTL_CANCEL);
e = errno;
@ -586,11 +580,9 @@ static int cmd_balance_resume(int argc, char **argv)
path = 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;
}
memset(&args, 0, sizeof(args));
args.flags |= BTRFS_BALANCE_RESUME;
@ -679,11 +671,9 @@ static int cmd_balance_status(int argc, char **argv)
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 2;
}
ret = ioctl(fd, BTRFS_IOC_BALANCE_PROGRESS, &args);
e = errno;