[PATCH] xfs_quota: fix free command for foreign fs

[Eric Sandeen <sandeen@xxxxxxxxxx>]

The "free" command is really just a fancy df that knows about
log space and realtime blocks for an xfs filesystem.

We can simply use statfs to get more or less the same thing
on a non-xfs filesystem, so, ah, do that I guess, and re-enable
it.

# quota/xfs_quota -f -x -c path -c free /mnt/test
          Filesystem          Pathname
[000] (F) /mnt/test           /dev/sdb1 (uquota)

Filesystem           1K-blocks       Used  Available  Use% Pathname
/dev/sdb1             20511356      45000   20466356    0% /mnt/test

Fix the short help text for -N while we're at it.

Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---

diff --git a/quota/free.c b/quota/free.c
index 3c8a5ce..cee15ee 100644
--- a/quota/free.c
+++ b/quota/free.c
@@ -77,34 +77,50 @@ mount_free_space_data(
                close(fd);
                return 0;
        }
-       if ((xfsctl(mount->fs_dir, fd, XFS_IOC_FSGEOMETRY_V1, &fsgeo)) < 0) {
-               perror("XFS_IOC_FSGEOMETRY_V1");
-               close(fd);
-               return 0;
-       }
-       if ((xfsctl(mount->fs_dir, fd, XFS_IOC_FSCOUNTS, &fscounts)) < 0) {
-               perror("XFS_IOC_FSCOUNTS");
-               close(fd);
-               return 0;
+
+       if (!(mount->fs_flags & FS_FOREIGN)) {
+               if ((xfsctl(mount->fs_dir, fd, XFS_IOC_FSGEOMETRY_V1,
+                                                       &fsgeo)) < 0) {
+                       perror("XFS_IOC_FSGEOMETRY_V1");
+                       close(fd);
+                       return 0;
+               }
+               if ((xfsctl(mount->fs_dir, fd, XFS_IOC_FSCOUNTS,
+                                                       &fscounts)) < 0) {
+                       perror("XFS_IOC_FSCOUNTS");
+                       close(fd);
+                       return 0;
+               }
+
+               logsize = fsgeo.logstart ? fsgeo.logblocks : 0;
+               count = (fsgeo.datablocks - logsize) * fsgeo.blocksize;
+               free  = fscounts.freedata * fsgeo.blocksize;
+               *bcount = BTOBB(count);
+               *bfree  = BTOBB(free);
+               *bused  = BTOBB(count - free);
+
+               count = fsgeo.rtextents * fsgeo.rtextsize * fsgeo.blocksize;
+               free  = fscounts.freertx * fsgeo.rtextsize * fsgeo.blocksize;
+               *rcount = BTOBB(count);
+               *rfree  = BTOBB(free);
+               *rused  = BTOBB(count - free);
+       } else {
+               count = st.f_blocks * st.f_bsize;
+               free = st.f_bfree * st.f_bsize;
+               *bcount = BTOBB(count);
+               *bfree  = BTOBB(free);
+               *bused  = BTOBB(count - free);
+
+               *rcount = BTOBB(0);
+               *rfree  = BTOBB(0);
+               *rused  = BTOBB(0);
        }
 
-       logsize = fsgeo.logstart ? fsgeo.logblocks : 0;
-       count = (fsgeo.datablocks - logsize) * fsgeo.blocksize;
-       free  = fscounts.freedata * fsgeo.blocksize;
-       *bcount = BTOBB(count);
-       *bfree  = BTOBB(free);
-       *bused  = BTOBB(count - free);
 
        *icount = st.f_files;
        *ifree  = st.f_ffree;
        *iused  = st.f_files - st.f_ffree;
 
-       count = fsgeo.rtextents * fsgeo.rtextsize * fsgeo.blocksize;
-       free  = fscounts.freertx * fsgeo.rtextsize * fsgeo.blocksize;
-       *rcount = BTOBB(count);
-       *rfree  = BTOBB(free);
-       *rused  = BTOBB(count - free);
-
        close(fd);
        return 1;
 }
@@ -369,9 +385,10 @@ free_init(void)
        free_cmd.cfunc = free_f;
        free_cmd.argmin = 0;
        free_cmd.argmax = -1;
-       free_cmd.args = _("[-bir] [-hn] [-f file]");
+       free_cmd.args = _("[-bir] [-hN] [-f file]");
        free_cmd.oneline = _("show free and used counts for blocks and inodes");
        free_cmd.help = free_help;
+       free_cmd.flags = CMD_FLAG_FOREIGN_OK;
 
        add_command(&free_cmd);
 }