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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2010-09-19 18:34:26 +0300
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2010-09-19 21:07:58 +0300
commit2ef13294d29bcfb306e0d360f1b97f37b647b0c0 (patch)
tree877e1ece00c14de0f0d79e86b6480d284d309216 /fs/ubifs/file.c
parent2680d722bf2c5f75225dd9acb3ec9e5a9e2652f4 (diff)
downloadlinux-2ef13294d29bcfb306e0d360f1b97f37b647b0c0.tar.bz2
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 <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'fs/ubifs/file.c')
-rw-r--r--fs/ubifs/file.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index c6bc51c9f07c..d77db7e36484 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -433,7 +433,7 @@ static int ubifs_write_begin(struct file *file, struct address_space *mapping,
struct page *page;
ubifs_assert(ubifs_inode(inode)->ui_size == inode->i_size);
- ubifs_assert(!c->ro_media);
+ ubifs_assert(!c->ro_media && !c->ro_mount);
if (unlikely(c->ro_error))
return -EROFS;
@@ -1440,8 +1440,7 @@ static int ubifs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vm
dbg_gen("ino %lu, pg %lu, i_size %lld", inode->i_ino, page->index,
i_size_read(inode));
- ubifs_assert(!(inode->i_sb->s_flags & MS_RDONLY));
- ubifs_assert(!c->ro_media);
+ ubifs_assert(!c->ro_media && !c->ro_mount);
if (unlikely(c->ro_error))
return VM_FAULT_SIGBUS; /* -EROFS */