From 2ef13294d29bcfb306e0d360f1b97f37b647b0c0 Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Sun, 19 Sep 2010 18:34:26 +0300 Subject: UBIFS: introduce new flags for RO mounts Commit 2fde99cb55fb9d9b88180512a5e8a5d939d27fec "UBIFS: mark VFS SB RO too" introduced regression. This commit made UBIFS set the 'MS_RDONLY' flag in the VFS superblock when it switches to R/O mode due to an error. This was done to make VFS show the R/O UBIFS flag in /proc/mounts. However, several places in UBIFS relied on the 'MS_RDONLY' flag and assume this flag can only change when we re-mount. For example, 'ubifs_put_super()'. This patch introduces new UBIFS flag - 'c->ro_mount' which changes only when we re-mount, and preserves the way UBIFS was originally mounted (R/W or R/O). This allows us to de-initialize UBIFS cleanly in 'ubifs_put_super()'. This patch also changes all 'ubifs_assert(!c->ro_media)' assertions to 'ubifs_assert(!c->ro_media && !c->ro_mount)', because we never should write anything if the FS was mounter R/O. All the places where we test for 'MS_RDONLY' flag in the VFS SB were changed and now we test the 'c->ro_mount' flag instead, because it preserves the original UBIFS mount type, unlike the 'MS_RDONLY' flag. Signed-off-by: Artem Bityutskiy --- fs/ubifs/misc.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'fs/ubifs/misc.h') diff --git a/fs/ubifs/misc.h b/fs/ubifs/misc.h index 5d476ba184e6..c3de04dc952a 100644 --- a/fs/ubifs/misc.h +++ b/fs/ubifs/misc.h @@ -132,7 +132,7 @@ static inline int ubifs_leb_unmap(const struct ubifs_info *c, int lnum) { int err; - ubifs_assert(!c->ro_media); + ubifs_assert(!c->ro_media && !c->ro_mount); if (c->ro_error) return -EROFS; err = ubi_leb_unmap(c->ubi, lnum); @@ -160,7 +160,7 @@ static inline int ubifs_leb_write(const struct ubifs_info *c, int lnum, { int err; - ubifs_assert(!c->ro_media); + ubifs_assert(!c->ro_media && !c->ro_mount); if (c->ro_error) return -EROFS; err = ubi_leb_write(c->ubi, lnum, buf, offs, len, dtype); @@ -188,7 +188,7 @@ static inline int ubifs_leb_change(const struct ubifs_info *c, int lnum, { int err; - ubifs_assert(!c->ro_media); + ubifs_assert(!c->ro_media && !c->ro_mount); if (c->ro_error) return -EROFS; err = ubi_leb_change(c->ubi, lnum, buf, len, dtype); -- cgit v1.2.3