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authorMike Frysinger <vapier@gentoo.org>2009-06-14 17:56:48 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-14 20:58:25 -0400
commit0a8eba9b7f7aa3ad0305627c99ad4d6deedd871d (patch)
treec714028520de3facd053e33abc280dbd214df8fd /fs/ramfs
parent45e3e1935e2857c54783291107d33323b3ef33c8 (diff)
ramfs: ignore unknown mount options
On systems where CONFIG_SHMEM is disabled, mounting tmpfs filesystems can fail when tmpfs options are used. This is because tmpfs creates a small wrapper around ramfs which rejects unknown options, and ramfs itself only supports a tiny subset of what tmpfs supports. This makes it pretty hard to use the same userspace systems across different configuration systems. As such, ramfs should ignore the tmpfs options when tmpfs is merely a wrapper around ramfs. This used to work before commit c3b1b1cbf0 as previously, ramfs would ignore all options. But now, we get: ramfs: bad mount option: size=10M mount: mounting mdev on /dev failed: Invalid argument Another option might be to restore the previous behavior, where ramfs simply ignored all unknown mount options ... which is what Hugh prefers. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Acked-by: Matt Mackall <mpm@selenic.com> Acked-by: Wu Fengguang <fengguang.wu@intel.com> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ramfs')
-rw-r--r--fs/ramfs/inode.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index 3a6b193d8444..0ff7566c767c 100644
--- a/fs/ramfs/inode.c
+++ b/fs/ramfs/inode.c
@@ -202,9 +202,12 @@ static int ramfs_parse_options(char *data, struct ramfs_mount_opts *opts)
202 return -EINVAL; 202 return -EINVAL;
203 opts->mode = option & S_IALLUGO; 203 opts->mode = option & S_IALLUGO;
204 break; 204 break;
205 default: 205 /*
206 printk(KERN_ERR "ramfs: bad mount option: %s\n", p); 206 * We might like to report bad mount options here;
207 return -EINVAL; 207 * but traditionally ramfs has ignored all mount options,
208 * and as it is used as a !CONFIG_SHMEM simple substitute
209 * for tmpfs, better continue to ignore other mount options.
210 */
208 } 211 }
209 } 212 }
210 213