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d208bbdda9
linux/fs
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Nick Piggin d208bbdda9 fs: improve remount,ro vs buffercache coherency 
Invalidate sb->s_bdev on remount,ro.

Fixes a problem reported by Jorge Boncompte who is seeing corruption
trying to snapshot a minix filesystem image.  Some filesystems modify
their metadata via a path other than the bdev buffer cache (eg.  they may
use a private linear mapping for their metadata, or implement directories
in pagecache, etc).  Also, file data modifications usually go to the bdev
via their own mappings.

These updates are not coherent with buffercache IO (eg.  via /dev/bdev)
and never have been.  However there could be a reasonable expectation that
after a mount -oremount,ro operation then the buffercache should
subsequently be coherent with previous filesystem modifications.

So invalidate the bdev mappings on a remount,ro operation to provide a
coherency point.

The problem was exposed when we switched the old rd to brd because old rd
didn't really function like a normal block device and updates to rd via
mappings other than the buffercache would still end up going into its
buffercache.  But the same problem has always affected other "normal"
block devices, including loop.

[akpm@linux-foundation.org: repair comment layout]
Reported-by: "Jorge Boncompte [DTI2]" <jorge@dti2.net>
Tested-by: "Jorge Boncompte [DTI2]" <jorge@dti2.net>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-03-03 13:00:20 -05:00
..
9p 9p: fix memory leak in v9fs_parse_options() 2010-02-08 17:59:34 -06:00
adfs
affs fix affs parse_options() 2010-01-26 22:22:25 -05:00
afs afs: remove manual O_SYNC handling 2009-12-10 15:02:50 +01:00
autofs
autofs4 Revert "autofs4: always use lookup for lookup" 2010-03-03 12:58:31 -05:00
befs befs: fix leak 2010-02-07 03:06:21 -05:00
bfs Fix failure exits in bfs_fill_super() 2010-01-26 22:22:25 -05:00
btrfs Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable 2010-02-15 19:56:21 -08:00
cachefiles CacheFiles: Fix a race in cachefiles_delete_object() vs rename 2010-02-20 10:06:35 -05:00
cifs Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6 2010-02-10 07:16:44 -08:00
coda
configfs Fix configfs leak 2010-01-14 09:05:42 -05:00
cramfs
debugfs get rid of pointless checks after simple_pin_fs() 2010-01-26 22:22:26 -05:00
devpts devpts_get_tty() should validate inode 2009-12-11 15:18:05 -08:00
dlm Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm 2009-12-10 09:33:59 -08:00
ecryptfs ecryptfs: use after free 2010-01-19 22:36:06 -06:00
efs
exofs exofs: simple_write_end does not mark_inode_dirty 2010-01-05 09:14:32 +02:00
exportfs
ext2 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-12-16 12:04:02 -08:00
ext3 ext3: Replace lock/unlock_super() with an explicit lock for resizing 2009-12-23 13:44:12 +01:00
ext4 ext4: Fix quota accounting error with fallocate 2010-01-25 04:00:31 -05:00
fat Merge git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6 2009-12-16 10:29:26 -08:00
freevxfs
fscache FS-Cache: Avoid maybe-used-uninitialised warning on variable 2009-12-16 07:20:13 -08:00
fuse mm: flush dcache before writing into page to avoid alias 2010-02-02 18:11:21 -08:00
gfs2 GFS2: Fix bmap allocation corner-case bug 2010-02-12 10:16:14 +00:00
hfs hfs: fix a potential buffer overflow 2009-12-15 08:53:10 -08:00
hfsplus
hostfs
hpfs hpfs: use bitmap_weight() 2009-12-16 07:20:06 -08:00
hppfs hppfs: handle ->put_link() 2010-01-14 09:05:25 -05:00
hugetlbfs Untangling ima mess, part 1: alloc_file() 2009-12-16 12:16:47 -05:00
isofs Merge branch 'for-2.6.33' of git://linux-nfs.org/~bfields/linux 2009-12-16 10:43:34 -08:00
jbd jbd: jbd-debug and jbd2-debug should be writable 2009-12-23 13:44:13 +01:00
jbd2 jbd2: don't use __GFP_NOFAIL in journal_init_common() 2009-12-23 08:05:15 -05:00
jffs2 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-12-16 12:04:02 -08:00
jfs jfs: Fix 32bit build warning 2009-12-22 12:27:35 -05:00
lockd Merge branch 'for-2.6.33' of git://linux-nfs.org/~bfields/linux 2009-12-16 10:43:34 -08:00
minix
ncpfs tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
nfs NFS: Too many GETATTR and ACCESS calls after direct I/O 2010-02-15 19:53:43 -08:00
nfs_common
nfsd vfs: don't call ima_file_check() unconditionally in nfsd_open() 2010-02-20 00:47:31 -05:00
nilfs2 nilfs2: fix potential leak of dirty data on umount 2010-01-31 14:57:31 +09:00
nls
notify inotify: only warn once for inotify problems 2010-01-15 14:49:23 -08:00
ntfs kill I_LOCK 2009-12-17 11:03:25 -05:00
ocfs2 ocfs2/cluster: Make o2net connect messages KERN_NOTICE 2010-02-08 13:02:28 -08:00
omfs tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
openpromfs
partitions
proc some clean up in fs/proc 2010-03-03 13:00:18 -05:00
qnx4 qnx4: use hweight8 2009-12-16 07:20:18 -08:00
quota quota: Fix dquot_transfer for filesystems different from ext4 2010-01-11 13:06:41 +01:00
ramfs nommu: fix shared mmap after truncate shrinkage problems 2010-01-16 12:15:40 -08:00
reiserfs reiserfs: Fix softlockup while waiting on an inode 2010-02-14 19:07:56 +01:00
romfs fix leak in romfs_fill_super() 2010-01-26 22:22:26 -05:00
smbfs
squashfs
sysfs sysfs: sysfs_sd_setattr set iattrs unconditionally 2010-02-16 15:42:42 -08:00
sysv
ubifs lib: Introduce generic list_sort function 2010-01-12 21:02:00 -08:00
udf udf: Avoid IO in udf_clear_inode 2009-12-14 21:40:04 +01:00
ufs ufs: NFS support 2009-12-16 07:20:06 -08:00
xfs xfs: xfs_swap_extents needs to handle dynamic fork offsets 2010-01-15 13:49:07 -06:00
aio.c aio: remove unused field 2009-12-16 07:20:13 -08:00
anon_inodes.c Sanitize f_flags helpers 2009-12-22 12:27:34 -05:00
attr.c
bad_inode.c
binfmt_aout.c Split 'flush_old_exec' into two functions 2010-01-29 08:22:01 -08:00
binfmt_elf_fdpic.c Split 'flush_old_exec' into two functions 2010-01-29 08:22:01 -08:00
binfmt_elf.c Split 'flush_old_exec' into two functions 2010-01-29 08:22:01 -08:00
binfmt_em86.c
binfmt_flat.c Split 'flush_old_exec' into two functions 2010-01-29 08:22:01 -08:00
binfmt_misc.c
binfmt_script.c
binfmt_som.c Split 'flush_old_exec' into two functions 2010-01-29 08:22:01 -08:00
bio-integrity.c block: fix bugs in bio-integrity mempool usage 2010-01-30 20:28:19 +01:00
bio.c block: fix bio_add_page for non trivial merge_bvec_fn case 2010-01-28 15:08:29 +01:00
block_dev.c freeze_bdev: don't deactivate successfully frozen MS_RDONLY sb 2010-02-07 03:06:21 -05:00
buffer.c
char_dev.c
compat_binfmt_elf.c
compat_ioctl.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6 2010-02-11 14:05:55 -08:00
compat.c compat.c: Remove dependence on nfsd private headers 2009-12-14 18:12:10 -05:00
dcache.c fs/dcache.c: CodingStyle cleanup 2010-03-03 13:00:19 -05:00
dcookies.c
direct-io.c dio: fix use-after-free 2009-12-17 04:52:13 -05:00
drop_caches.c
eventfd.c eventfd - allow atomic read and waitqueue remove 2010-01-25 12:26:38 -02:00
eventpoll.c anonfd: Allow making anon files read-only 2009-12-22 12:27:34 -05:00
exec.c fs/exec.c: fix initial stack reservation 2010-02-22 19:50:34 -08:00
fcntl.c Fix race in tty_fasync() properly 2010-02-07 10:26:01 -08:00
fifo.c
file_table.c Take ima_file_free() to proper place. 2010-02-07 03:07:29 -05:00
file.c
filesystems.c
fs_struct.c
fs-writeback.c writeback: add missing kernel-doc notation 2010-01-02 10:09:44 -08:00
generic_acl.c make generic_acl slightly more generic 2009-12-16 12:16:49 -05:00
inode.c kill I_LOCK 2009-12-17 11:03:25 -05:00
internal.h Fix f_flags/f_mode in case of lookup_instantiate_filp() from open(pathname, 3) 2009-12-22 12:27:34 -05:00
ioctl.c
ioprio.c
Kconfig Revert "task_struct: make journal_info conditional" 2009-12-17 13:23:24 -08:00
Kconfig.binfmt
libfs.c libfs: Unexport and kill simple_prepare_write 2010-03-03 13:00:17 -05:00
locks.c
Makefile
mbcache.c
mpage.c
namei.c fix LOOKUP_FOLLOW on automount "symlinks" 2010-02-19 03:56:42 -05:00
namespace.c do_add_mount() should sanitize mnt_flags 2010-01-16 13:07:36 -05:00
nfsctl.c vfs: nfsctl.c un-used nfsd #includes 2009-12-14 18:12:11 -05:00
no-block.c
open.c Sanitize f_flags helpers 2009-12-22 12:27:34 -05:00
pipe.c fs: no games with DCACHE_UNHASHED 2009-12-17 10:51:40 -05:00
pnode.c
pnode.h
posix_acl.c
read_write.c
read_write.h
readdir.c
select.c
seq_file.c
signalfd.c anonfd: Allow making anon files read-only 2009-12-22 12:27:34 -05:00
splice.c
stack.c VFS/fsstack: handle 32-bit smp + preempt + large files in fsstack_copy_inode_size 2009-12-17 10:58:17 -05:00
stat.c Add unlocked version of inode_add_bytes() function 2009-12-23 13:33:54 +01:00
super.c fs: improve remount,ro vs buffercache coherency 2010-03-03 13:00:20 -05:00
sync.c fold do_sync_file_range into sys_sync_file_range 2009-12-17 11:03:25 -05:00
timerfd.c anonfd: Allow making anon files read-only 2009-12-22 12:27:34 -05:00
utimes.c
xattr_acl.c
xattr.c sanitize xattr handler prototypes 2009-12-16 12:16:49 -05:00