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/io.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) (limited to 'fs/ubifs/io.c') diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c index 18a4b8d7c84..d82173182ee 100644 --- a/fs/ubifs/io.c +++ b/fs/ubifs/io.c @@ -356,10 +356,9 @@ int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf) dbg_io("LEB %d:%d, %d bytes, jhead %s", wbuf->lnum, wbuf->offs, wbuf->used, dbg_jhead(wbuf->jhead)); - ubifs_assert(!(c->vfs_sb->s_flags & MS_RDONLY)); ubifs_assert(!(wbuf->avail & 7)); ubifs_assert(wbuf->offs + c->min_io_size <= c->leb_size); - ubifs_assert(!c->ro_media); + ubifs_assert(!c->ro_media && !c->ro_mount); if (c->ro_error) return -EROFS; @@ -441,7 +440,7 @@ int ubifs_bg_wbufs_sync(struct ubifs_info *c) { int err, i; - ubifs_assert(!c->ro_media); + ubifs_assert(!c->ro_media && !c->ro_mount); if (!c->need_wbuf_sync) return 0; c->need_wbuf_sync = 0; @@ -521,7 +520,7 @@ int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len) ubifs_assert(!(wbuf->offs & 7) && wbuf->offs <= c->leb_size); ubifs_assert(wbuf->avail > 0 && wbuf->avail <= c->min_io_size); ubifs_assert(mutex_is_locked(&wbuf->io_mutex)); - ubifs_assert(!c->ro_media); + ubifs_assert(!c->ro_media && !c->ro_mount); if (c->leb_size - wbuf->offs - wbuf->used < aligned_len) { err = -ENOSPC; @@ -666,7 +665,7 @@ int ubifs_write_node(struct ubifs_info *c, void *buf, int len, int lnum, buf_len); ubifs_assert(lnum >= 0 && lnum < c->leb_cnt && offs >= 0); ubifs_assert(offs % c->min_io_size == 0 && offs < c->leb_size); - ubifs_assert(!c->ro_media); + ubifs_assert(!c->ro_media && !c->ro_mount); if (c->ro_error) return -EROFS; -- cgit v1.2.3