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Linus Torvalds d4da6c9ccf Revert "ext4: Remove journal_checksum mount option and enable it by default" 
This reverts commit d0646f7b63, as
requested by Eric Sandeen.

It can basically cause an ext4 filesystem to miss recovery (and thus get
mounted with errors) if the journal checksum does not match.

Quoth Eric:

   "My hand-wavy hunch about what is happening is that we're finding a
    bad checksum on the last partially-written transaction, which is
    not surprising, but if we have a wrapped log and we're doing the
    initial scan for head/tail, and we abort scanning on that bad
    checksum, then we are essentially running an unrecovered filesystem.

    But that's hand-wavy and I need to go look at the code.

    We lived without journal checksums on by default until now, and at
    this point they're doing more harm than good, so we should revert
    the default-changing commit until we can fix it and do some good
    power-fail testing with the fixes in place."

See

	http://bugzilla.kernel.org/show_bug.cgi?id=14354

for all the gory details.

Requested-by: Eric Sandeen <sandeen@redhat.com>
Cc: Theodore Tso <tytso@mit.edu>
Cc: Alexey Fisher <bug-track@fisher-privat.net>
Cc: Maxim Levitsky <maximlevitsky@gmail.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Mathias Burén <mathias.buren@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2009-11-02 10:15:27 -08:00
..
caching trivial: Miscellaneous documentation typo fixes 2009-06-12 18:01:47 +02:00
configfs docsrc: build Documentation/ sources 2008-08-12 16:07:30 -07:00
pohmelfs Staging: Pohmelfs: Added IO permissions and priorities. 2009-04-17 11:06:30 -07:00
00-INDEX update Documentation/filesystems/00-INDEX with new nfsd related docs. 2009-04-28 12:54:45 -04:00
9p.txt 9p: Update documentation to add fscache related bits 2009-09-23 13:03:46 -05:00
Exporting exportfs: update documentation 2007-10-22 08:13:21 -07:00
Locking update Documentation/filesystems/Locking 2009-06-24 08:15:25 -04:00
adfs.txt Fix typos in /Documentation : 'U-Z' 2006-11-30 04:58:40 +01:00
affs.txt [PATCH] kernel Doc/ URL corrections 2005-11-22 09:14:30 -08:00
afs.txt AFS: Documentation updates 2009-08-19 10:40:13 -07:00
autofs4-mount-control.txt trivial: Miscellaneous documentation typo fixes 2009-06-12 18:01:47 +02:00
automount-support.txt VFS: Unexport do_kern_mount() and clean up simple_pin_fs() 2006-06-09 09:34:16 -04:00
befs.txt Fix typos in Documentation/: 'Q'-'R' 2006-10-03 22:54:15 +02:00
bfs.txt remove mention of CONFIG_KMOD from documentation 2008-07-22 19:24:29 +10:00
btrfs.txt Btrfs: Add Documentation/filesystem/btrfs.txt, remove old COPYING 2009-01-07 09:54:24 -05:00
cifs.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
coda.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cramfs.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
debugfs.txt Document the debugfs API 2009-06-06 10:28:14 -06:00
dentry-locking.txt [PATCH] VFS: split dentry locking documentation 2005-11-07 07:53:56 -08:00
devpts.txt Document usage of multiple-instances of devpts 2009-01-02 10:19:36 -08:00
directory-locking Documentation: Fix up docs still talking about i_sem 2007-05-24 10:16:17 -07:00
dlmfs.txt Fix typos in Documentation/: 'D'-'E' 2006-10-03 22:47:42 +02:00
dnotify.txt Documentation: move dnotify.txt to filesystems/ 2008-02-07 08:42:17 -08:00
ecryptfs.txt eCryptfs: Move ecryptfs docs into Documentation/filesystems/ 2007-07-17 10:23:08 -07:00
exofs.txt exofs: Documentation 2009-03-31 19:44:38 +03:00
ext2.txt Doc fix: ext2 can only have 32,000 subdirs, not 32,768 2009-06-18 13:03:44 -07:00
ext3.txt ext3: Update documentation about ext3 quota mount options 2009-10-13 00:06:43 +02:00
ext4.txt Revert "ext4: Remove journal_checksum mount option and enable it by default" 2009-11-02 10:15:27 -08:00
fiemap.txt trivial: Miscellaneous documentation typo fixes 2009-06-12 18:01:47 +02:00
files.txt fix f_count description in Documentation/filesystems/files.txt 2008-12-31 18:07:42 -05:00
fuse.txt [PATCH] fuse: fix typo 2006-12-30 10:56:45 -08:00
gfs2-glocks.txt GFS2: Update docs 2009-05-19 10:23:23 +01:00
gfs2-uevents.txt GFS2: Add a document explaining GFS2's uevents 2009-08-17 11:11:41 +01:00
gfs2.txt GFS2: Update docs 2009-05-19 10:23:23 +01:00
hfs.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
hfsplus.txt Documentation: document HFSPlus 2007-07-31 15:39:38 -07:00
hpfs.txt misc doc and kconfig typos 2007-05-09 08:58:15 +02:00
inotify.txt [PATCH] inotify (5/5): update kernel documentation 2006-06-20 05:25:19 -04:00
isofs.txt isofs: let mode and dmode mount options override rock ridge mode setting 2009-06-18 13:03:45 -07:00
jfs.txt JFS: document uid, gid, and umask mount options in jfs.txt 2007-03-09 10:27:31 -06:00
knfsd-stats.txt Document /proc/fs/nfsd/pool_stats 2009-03-27 19:24:27 -04:00
locks.txt Documentation: move locks.txt in filesystems/ 2007-10-09 18:32:45 -04:00
mandatory-locking.txt locks: add warning about mandatory locking races 2007-10-09 18:32:45 -04:00
ncpfs.txt ncpfs: remove dead URL from documentation 2009-09-23 07:39:42 -07:00
nfs-rdma.txt trivial: Miscellaneous documentation typo fixes 2009-06-12 18:01:47 +02:00
nfs.txt NFS: Add a dns resolver for use with NFSv4 referrals and migration 2009-08-19 18:22:15 -04:00
nfs41-server.txt nfsd: revise 4.1 status documentation 2009-09-21 11:13:45 -04:00
nfsroot.txt trivial: fix typo "for for" in multiple files 2009-09-21 15:14:54 +02:00
nilfs2.txt nilfs2: modify list of unsupported features in caveats 2009-06-10 23:41:11 +09:00
ntfs.txt NTFS: update homepage 2008-09-02 19:21:37 -07:00
ocfs2.txt ocfs2: add mount option and Kconfig option for acl 2009-01-05 08:36:52 -08:00
omfs.txt omfs: add filesystem documentation 2008-07-26 12:00:05 -07:00
porting iget: remove iget() and the read_inode() super op as being obsolete 2008-02-07 08:42:29 -08:00
proc.txt ext4: Use tracepoints for mb_history trace file 2009-09-30 00:32:42 -04:00
quota.txt quota: documentation for sending "below quota" messages via netlink and tiny doc update 2008-08-12 16:07:27 -07:00
ramfs-rootfs-initramfs.txt Trivial Documentation/filesystems/ramfs-rootfs-initramfs.txt fix 2008-11-30 11:40:56 -08:00
relay.txt relay: add buffer-only channels; useful for early logging 2008-07-26 12:00:04 -07:00
romfs.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
rpc-cache.txt Documentation: move rpc-cache.txt to filesystems/ 2008-04-11 13:20:52 -06:00
seq_file.txt Doc: seq_file.txt fix wrong dd command example. 2009-09-10 14:33:35 -06:00
sharedsubtree.txt doc/filesystems: more mount cleanups 2009-09-24 07:20:57 -07:00
smbfs.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
spufs.txt Fix typos in /Documentation : 'U-Z' 2006-11-30 04:58:40 +01:00
squashfs.txt Squashfs: fix documentation typo, Cramfs filesystem limit is 256 MiB 2009-03-05 00:40:13 +00:00
sysfs-pci.txt trivial: Miscellaneous documentation typo fixes 2009-06-12 18:01:47 +02:00
sysfs.txt driver core: documentation: make it clear that sysfs is optional 2009-07-28 13:45:23 -07:00
sysv-fs.txt [PATCH] fs/sysv/: doc cleanup 2006-12-07 08:39:44 -08:00
tmpfs.txt hugh: update email address 2009-05-21 13:14:32 -07:00
ubifs.txt UBIFS: remove fast unmounting 2009-01-29 16:34:30 +02:00
udf.txt udf: implement mode and dmode mounting options 2009-04-02 12:29:50 +02:00
ufs.txt [PATCH] ufs2 write: mount as rw 2007-02-12 09:48:40 -08:00
vfat.txt vfat: change the default from shortname=lower to shortname=mixed 2009-08-01 21:35:25 +09:00
vfs.txt HWPOISON: Define a new error_remove_page address space op for async truncation 2009-09-16 11:50:13 +02:00
xfs.txt [XFS] remove restricted chown parameter from xfs linux 2008-10-30 18:30:09 +11:00
xip.txt DOC: update xip method info 2008-11-12 17:17:17 -08:00