[PATCH v3 2/2] xfs_quota: additional changes to allow use on ext4

["Bill O'Donnell" <billodo@xxxxxxxxxx>]

Further changes to allow xfs_quota to be used on foreign filesystem(s)
(e.g. ext4) for project quota testing in xfstests.

Add CMD_SKIP_CHECK to enable "generic" xfs_quota commands (help and
quit) when xfs_quota is run on foreign filesystems.
Use CMD_FLAG_FOREIGN_OK on commands suitable for foreign filesystems.
Refactor init_check_command in quota/init.c for clarity.

Signed-off-by: Bill O'Donnell <billodo@xxxxxxxxxx>
---
 libxcmd/help.c |  4 +++-
 libxcmd/quit.c |  4 +++-
 quota/init.c   | 29 ++++++++++++++++++++---------
 quota/init.h   |  2 ++
 4 files changed, 28 insertions(+), 11 deletions(-)

diff --git a/libxcmd/help.c b/libxcmd/help.c
index fad0ab9..d2e72a0 100644
--- a/libxcmd/help.c
+++ b/libxcmd/help.c
@@ -18,6 +18,7 @@
 
 #include "platform_defs.h"
 #include "command.h"
+#include "../quota/init.h"
 
 static cmdinfo_t help_cmd;
 static void help_onecmd(const char *cmd, const cmdinfo_t *ct);
@@ -88,7 +89,8 @@ help_init(void)
        help_cmd.cfunc = help_f;
        help_cmd.argmin = 0;
        help_cmd.argmax = 1;
-       help_cmd.flags = CMD_FLAG_GLOBAL;
+       help_cmd.flags = CMD_FLAG_GLOBAL | CMD_FLAG_FOREIGN_OK |
+               CMD_SKIP_CHECK;
        help_cmd.args = _("[command]");
        help_cmd.oneline = _("help for one or all commands");
 
diff --git a/libxcmd/quit.c b/libxcmd/quit.c
index 0183b8f..9dbd29a 100644
--- a/libxcmd/quit.c
+++ b/libxcmd/quit.c
@@ -18,6 +18,7 @@
 
 #include "platform_defs.h"
 #include "command.h"
+#include "../quota/init.h"
 
 static cmdinfo_t quit_cmd;
 
@@ -38,7 +39,8 @@ quit_init(void)
        quit_cmd.cfunc = quit_f;
        quit_cmd.argmin = -1;
        quit_cmd.argmax = -1;
-       quit_cmd.flags = CMD_FLAG_GLOBAL;
+       quit_cmd.flags = CMD_FLAG_GLOBAL | CMD_FLAG_FOREIGN_OK |
+               CMD_SKIP_CHECK;
        quit_cmd.oneline = _("exit the program");
 
        add_command(&quit_cmd);
diff --git a/quota/init.c b/quota/init.c
index 137cd68..b487dd5 100644
--- a/quota/init.c
+++ b/quota/init.c
@@ -109,15 +109,26 @@ static int
 init_check_command(
        const cmdinfo_t *ct)
 {
-       if (fs_path &&
-           !(ct->flags & CMD_FLAG_FOREIGN_OK) &&
-            (fs_path->fs_flags & FS_FOREIGN)) {
-               fprintf(stderr,
-       _("foreign mount active, %s command is for XFS filesystems only\n"),
-                       ct->name);
-               return 0;
-       }
-       return 1;
+       if (!fs_path)
+               return 1;
+
+       /* Always run commands that we are told to skip here */
+       if (ct->flags & CMD_SKIP_CHECK)
+               return 1;
+
+       /* if it's an XFS filesystem, always run the command */
+       if (!(fs_path->fs_flags & FS_FOREIGN))
+               return 1;
+
+       /* If the user specified foreign filesysetms are ok, run it */
+       if (foreign_allowed &&
+           (ct->flags & CMD_FLAG_FOREIGN_OK))
+               return 1;
+
+       /* foreign filesystem and it's no a valid command! */
+       fprintf(stderr, _("%s command is for XFS filesystems only\n"),
+               ct->name);
+       return 0;
 }
 
 static void
diff --git a/quota/init.h b/quota/init.h
index 6879855..aa1cc51 100644
--- a/quota/init.h
+++ b/quota/init.h
@@ -31,3 +31,5 @@ extern void   report_init(void);
 extern void    state_init(void);
 
 extern void init_cvtnum(unsigned int *, unsigned int *);
+
+#define CMD_SKIP_CHECK (1<<0) /* command is always run */
-- 
2.7.4