linux-toradex.git/fs, branch v3.3.1

lockd: fix arg parsing for grace_period and timeout.

2012-04-02T17:32:23+00:00

commit de5b8e8e047534aac6bc9803f96e7257436aef9c upstream.

If you try to set grace_period or timeout via a module parameter
to lockd, and do this on a big-endian machine where

   sizeof(int) != sizeof(unsigned long)

it won't work.  This number given will be effectively shifted right
by the difference in those two sizes.

So cast kp->arg properly to get correct result.

Signed-off-by: NeilBrown 
Signed-off-by: J. Bruce Fields 
Signed-off-by: Greg Kroah-Hartman

NFSv4.1: Fix layoutcommit error handling

2012-04-02T17:32:22+00:00

commit e59d27e05a6435f8c04d5ad843f37fa795f2eaaa upstream.

Firstly, task->tk_status will always return negative error values,
so the current tests for 'NFS4ERR_DELEG_REVOKED' etc. are all being
ignored.
Secondly, clean up the code so that we only need to test
task->tk_status once!

Signed-off-by: Trond Myklebust 
Signed-off-by: Greg Kroah-Hartman

NFSv4: Fix two infinite loops in the mount code

2012-04-02T17:32:22+00:00

commit 05e9cfb408b24debb3a85fd98edbfd09dd148881 upstream.

We can currently loop forever in nfs4_lookup_root() and in
nfs41_proc_secinfo_no_name(), if the first iteration returns a
NFS4ERR_DELAY or something else that causes exception.retry to get
set.

Reported-by: Weston Andros Adamson 
Signed-off-by: Trond Myklebust 
Signed-off-by: Greg Kroah-Hartman

xfs: Fix oops on IO error during xlog_recover_process_iunlinks()

2012-04-02T17:32:21+00:00

commit d97d32edcd732110758799ae60af725e5110b3dc upstream.

When an IO error happens during inode deletion run from
xlog_recover_process_iunlinks() filesystem gets shutdown. Thus any subsequent
attempt to read buffers fails. Code in xlog_recover_process_iunlinks() does not
count with the fact that read of a buffer which was read a while ago can
really fail which results in the oops on
  agi = XFS_BUF_TO_AGI(agibp);

Fix the problem by cleaning up the buffer handling in
xlog_recover_process_iunlinks() as suggested by Dave Chinner. We release buffer
lock but keep buffer reference to AG buffer. That is enough for buffer to stay
pinned in memory and we don't have to call xfs_read_agi() all the time.

Signed-off-by: Jan Kara 
Reviewed-by: Dave Chinner 
Signed-off-by: Ben Myers 
Signed-off-by: Greg Kroah-Hartman

vfs: fix d_ancestor() case in d_materialize_unique

2012-04-02T17:32:20+00:00

commit b18dafc86bb879d2f38a1743985d7ceb283c2f4d upstream.

In d_materialise_unique() there are 3 subcases to the 'aliased dentry'
case; in two subcases the inode i_lock is properly released but this
does not occur in the -ELOOP subcase.

This seems to have been introduced by commit 1836750115f2 ("fix loop
checks in d_materialise_unique()").

Signed-off-by: Michel Lespinasse 
[ Added a comment, and moved the unlock to where we generate the -ELOOP,
  which seems to be more natural.

  You probably can't actually trigger this without a buggy network file
  server - d_materialize_unique() is for finding aliases on non-local
  filesystems, and the d_ancestor() case is for a hardlinked directory
  loop.

  But we should be robust in the case of such buggy servers anyway. ]
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

ext4: check for zero length extent

2012-04-02T17:32:20+00:00

commit 31d4f3a2f3c73f279ff96a7135d7202ef6833f12 upstream.

Explicitly test for an extent whose length is zero, and flag that as a
corrupted extent.

This avoids a kernel BUG_ON assertion failure.

Tested: Without this patch, the file system image found in
tests/f_ext_zero_len/image.gz in the latest e2fsprogs sources causes a
kernel panic.  With this patch, an ext4 file system error is noted
instead, and the file system is marked as being corrupted.

https://bugzilla.kernel.org/show_bug.cgi?id=42859

Signed-off-by: "Theodore Ts'o" 
Signed-off-by: Greg Kroah-Hartman

ext4: fix race between sync and completed io work

2012-04-02T17:32:20+00:00

commit 491caa43639abcffaa645fbab372a7ef4ce2975c upstream.

The following command line will leave the aio-stress process unkillable
on an ext4 file system (in my case, mounted on /mnt/test):

aio-stress -t 20 -s 10 -O -S -o 2 -I 1000 /mnt/test/aiostress.3561.4 /mnt/test/aiostress.3561.4.20 /mnt/test/aiostress.3561.4.19 /mnt/test/aiostress.3561.4.18 /mnt/test/aiostress.3561.4.17 /mnt/test/aiostress.3561.4.16 /mnt/test/aiostress.3561.4.15 /mnt/test/aiostress.3561.4.14 /mnt/test/aiostress.3561.4.13 /mnt/test/aiostress.3561.4.12 /mnt/test/aiostress.3561.4.11 /mnt/test/aiostress.3561.4.10 /mnt/test/aiostress.3561.4.9 /mnt/test/aiostress.3561.4.8 /mnt/test/aiostress.3561.4.7 /mnt/test/aiostress.3561.4.6 /mnt/test/aiostress.3561.4.5 /mnt/test/aiostress.3561.4.4 /mnt/test/aiostress.3561.4.3 /mnt/test/aiostress.3561.4.2

This is using the aio-stress program from the xfstests test suite.
That particular command line tells aio-stress to do random writes to
20 files from 20 threads (one thread per file). The files are NOT
preallocated, so you will get writes to random offsets within the
file, thus creating holes and extending i_size. It also opens the
file with O_DIRECT and O_SYNC.

On to the problem. When an I/O requires unwritten extent conversion,
it is queued onto the completed_io_list for the ext4 inode. Two code
paths will pull work items from this list. The first is the
ext4_end_io_work routine, and the second is ext4_flush_completed_IO,
which is called via the fsync path (and O_SYNC handling, as well).
There are two issues I've found in these code paths. First, if the
fsync path beats the work routine to a particular I/O, the work
routine will free the io_end structure! It does not take into account
the fact that the io_end may still be in use by the fsync path. I've
fixed this issue by adding yet another IO_END flag, indicating that
the io_end is being processed by the fsync path.

The second problem is that the work routine will make an assignment to
io->flag outside of the lock. I have witnessed this result in a hang
at umount. Moving the flag setting inside the lock resolved that
problem.

The problem was introduced by commit b82e384c7b ("ext4: optimize
locking for end_io extent conversion"), which first appeared in 3.2.
As such, the fix should be backported to that release (probably along
with the unwritten extent conversion race fix).

Signed-off-by: Jeff Moyer
Signed-off-by: "Theodore Ts'o"
Signed-off-by: Greg Kroah-Hartman

ext4: fix race between unwritten extent conversion and truncate

2012-04-02T17:32:20+00:00

commit 266991b13890049ee1a6bb95b9817f06339ee3d7 upstream.

The following comment in ext4_end_io_dio caught my attention:

	/* XXX: probably should move into the real I/O completion handler */
        inode_dio_done(inode);

The truncate code takes i_mutex, then calls inode_dio_wait.  Because the
ext4 code path above will end up dropping the mutex before it is
reacquired by the worker thread that does the extent conversion, it
seems to me that the truncate can happen out of order.  Jan Kara
mentioned that this might result in error messages in the system logs,
but that should be the extent of the "damage."

The fix is pretty straight-forward: don't call inode_dio_done until the
extent conversion is complete.

Reviewed-by: Jan Kara 
Signed-off-by: Jeff Moyer 
Signed-off-by: "Theodore Ts'o" 
Signed-off-by: Greg Kroah-Hartman

ext4: ignore EXT4_INODE_JOURNAL_DATA flag with delalloc

2012-04-02T17:32:13+00:00

commit 3d2b158262826e8b75bbbfb7b97010838dd92ac7 upstream.

Ext4 does not support data journalling with delayed allocation enabled.
We even do not allow to mount the file system with delayed allocation
and data journalling enabled, however it can be set via FS_IOC_SETFLAGS
so we can hit the inode with EXT4_INODE_JOURNAL_DATA set even on file
system mounted with delayed allocation (default) and that's where
problem arises. The easies way to reproduce this problem is with the
following set of commands:

 mkfs.ext4 /dev/sdd
 mount /dev/sdd /mnt/test1
 dd if=/dev/zero of=/mnt/test1/file bs=1M count=4
 chattr +j /mnt/test1/file
 dd if=/dev/zero of=/mnt/test1/file bs=1M count=4 conv=notrunc
 chattr -j /mnt/test1/file

Additionally it can be reproduced quite reliably with xfstests 272 and
269. In fact the above reproducer is a part of test 272.

To fix this we should ignore the EXT4_INODE_JOURNAL_DATA inode flag if
the file system is mounted with delayed allocation. This can be easily
done by fixing ext4_should_*_data() functions do ignore data journal
flag when delalloc is set (suggested by Ted). We also have to set the
appropriate address space operations for the inode (again, ignoring data
journal flag if delalloc enabled).

Additionally this commit introduces ext4_inode_journal_mode() function
because ext4_should_*_data() has already had a lot of common code and
this change is putting it all into one function so it is easier to
read.

Successfully tested with xfstests in following configurations:

delalloc + data=ordered
delalloc + data=writeback
data=journal
nodelalloc + data=ordered
nodelalloc + data=writeback
nodelalloc + data=journal

Signed-off-by: Lukas Czerner 
Signed-off-by: "Theodore Ts'o" 
Signed-off-by: Greg Kroah-Hartman

jbd2: clear BH_Delay & BH_Unwritten in journal_unmap_buffer

2012-04-02T17:32:11+00:00

commit 15291164b22a357cb211b618adfef4fa82fc0de3 upstream.

journal_unmap_buffer()'s zap_buffer: code clears a lot of buffer head
state ala discard_buffer(), but does not touch _Delay or _Unwritten as
discard_buffer() does.

This can be problematic in some areas of the ext4 code which assume
that if they have found a buffer marked unwritten or delay, then it's
a live one.  Perhaps those spots should check whether it is mapped
as well, but if jbd2 is going to tear down a buffer, let's really
tear it down completely.

Without this I get some fsx failures on sub-page-block filesystems
up until v3.2, at which point 4e96b2dbbf1d7e81f22047a50f862555a6cb87cb
and 189e868fa8fdca702eb9db9d8afc46b5cb9144c9 make the failures go
away, because buried within that large change is some more flag
clearing.  I still think it's worth doing in jbd2, since
->invalidatepage leads here directly, and it's the right place
to clear away these flags.

Signed-off-by: Eric Sandeen 
Signed-off-by: "Theodore Ts'o" 
Signed-off-by: Greg Kroah-Hartman