[patch 1/1] reiserfs: make resize option auto-get new device size

[blaisorblade@yahoo.it]

Cc: <reiserfs-dev@namesys.com>, <reiserfs-list@namesys.com>, <mtk-manpages@gmx.net>

It's trivial for the resize option to auto-get the underlying device size, while
it's harder for the user. I've copied the code from jfs.

Since of the different reiserfs option parser (which does not use the superior
match_token used by almost every other filesystem), I've had to use the
"resize=auto" and not "resize" option to specify this behaviour. Changing the
option parser to the kernel one wouldn't be bad but I've no time to do this
cleanup in this moment.

Btw, the mount(8) man page should be updated to include this option. Cc the
relevant people, please (I hope I cc'ed the right people).

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
---

 linux-2.6.11-paolo/fs/reiserfs/super.c |   21 ++++++++++++++-------
 1 files changed, 14 insertions(+), 7 deletions(-)

diff -puN fs/reiserfs/super.c~reiserfs-resize-option-like-jfs-auto-get fs/reiserfs/super.c
--- linux-2.6.11/fs/reiserfs/super.c~reiserfs-resize-option-like-jfs-auto-get	2005-04-07 20:37:58.000000000 +0200
+++ linux-2.6.11-paolo/fs/reiserfs/super.c	2005-04-08 01:01:18.000000000 +0200
@@ -889,12 +889,18 @@ static int reiserfs_parse_options (struc
 	    char * p;
 	    
 	    p = NULL;
-	    /* "resize=NNN" */
-	    *blocks = simple_strtoul (arg, &p, 0);
-	    if (*p != '\0') {
-		/* NNN does not look like a number */
-		reiserfs_warning (s, "reiserfs_parse_options: bad value %s", arg);
-		return 0;
+	    /* "resize=NNN" or "resize=auto" */
+
+	    if (!strcmp(arg, "auto")) {
+		    /* From JFS code, to auto-get the size.*/
+		    *blocks = s->s_bdev->bd_inode->i_size >> s->s_blocksize_bits;
+	    } else {
+		    *blocks = simple_strtoul (arg, &p, 0);
+		    if (*p != '\0') {
+			/* NNN does not look like a number */
+			reiserfs_warning (s, "reiserfs_parse_options: bad value %s", arg);
+			return 0;
+		    }
 	    }
 	}
 
@@ -903,7 +909,8 @@ static int reiserfs_parse_options (struc
 		unsigned long val = simple_strtoul (arg, &p, 0);
 		/* commit=NNN (time in seconds) */
 		if ( *p != '\0' || val >= (unsigned int)-1) {
-			reiserfs_warning (s, "reiserfs_parse_options: bad value %s", arg);			return 0;
+			reiserfs_warning (s, "reiserfs_parse_options: bad value %s", arg);
+			return 0;
 		}
 		*commit_max_age = (unsigned int)val;
 	}
_
-
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