Commit Graph

1832 Commits

Author SHA1 Message Date
Jan Kara
0efb3b2300 ext4: move several mount options to standard handling loop
Several mount option (resuid, resgid, journal_dev, journal_ioprio) are
currently handled before we enter standard option handling loop. I don't
see a reason for this so move them to normal handling loop to make things
more regular.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-02-02 22:52:19 -05:00
Cong Ding
0e79537d30 ext4: reduce one "if" comparison in ext4_dirhash()
It is unnecessary to check i<4 after the loop; just do it before the
break.

Signed-off-by: Cong Ding <dinggnu@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-02-01 22:33:21 -05:00
Niu Yawei
f116700971 ext4: fix race in ext4_mb_add_n_trim()
In ext4_mb_add_n_trim(), lg_prealloc_lock should be taken when
changing the lg_prealloc_list.

Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org
2013-02-01 21:31:27 -05:00
Akria Fujita
87e698734b ext4: fix smatch warning in move_extent.c's mext_replace_branches()
Commit 2147b1a6a4 resulted in a new smatch warning:

> fs/ext4/move_extent.c:693 mext_replace_branches()
> 	 warn: variable dereferenced before check 'dext' (see line 683)

Fix this by adding a check to make sure dext is non-NULL before we
derefrence it.

Signed-off-by: Akria Fujita <a-fujita@rs.jp.nec.com>
[ modified by tytso to make sure an ext4_error is called ]
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-02-01 20:52:46 -05:00
Julia Lawall
524c19ebc9 ext4: use WARN in ext4_alloc_blocks
Use WARN rather than printk followed by WARN_ON(1), for conciseness.

A simplified version of the semantic patch that makes this transformation
is as follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression list es;
@@

-printk(
+WARN(1,
  es);
-WARN_ON(1);
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-02-01 20:07:21 -05:00
Jan Kara
091e26dfc1 ext4: fix possible use-after-free with AIO
Running AIO is pinning inode in memory using file reference. Once AIO
is completed using aio_complete(), file reference is put and inode can
be freed from memory. So we have to be sure that calling aio_complete()
is the last thing we do with the inode.

CC: stable@vger.kernel.org
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-29 22:48:17 -05:00
Guo Chao
b1deefc99e ext4: remove unnecessary NULL pointer check
brelse() and ext4_journal_force_commit() are both inlined and able
to handle NULL.

Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-28 21:41:02 -05:00
Guo Chao
41be871f74 ext4: remove useless assignment in dx_probe()
Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-28 21:33:28 -05:00
Guo Chao
2bbbee2a68 ext4: remove unused variable in add_dirent_to_buf()
After commit 978fef9 (create __ext4_insert_dentry for dir entry
insertion), 'reclen' is not used anymore.

Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
2013-01-28 21:26:44 -05:00
Guo Chao
d5ac777305 ext4: release buffer when checksum failed
Commit b0336e8d (ext4: calculate and verify checksums of directory
leaf blocks) and commit dbe89444 (ext4: Calculate and verify checksums
for htree nodes) forget to release buffer when checksum failed, at
some places.

Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
2013-01-28 21:23:24 -05:00
Lukas Czerner
b06acd38a4 ext4: remove explicit WARN_ON when ext4_map_blocks() fails
In two places we call WARN_ON() before we print out the debug message,
however we agreed that the WARN_ON() is unnecessary at those places so
remove them.

Also use ext4_warning() instead of ext4_msg() and printk().

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-28 21:21:12 -05:00
Lukas Czerner
cfa7275482 ext4: remove unused variable flags
Remove unused variable flags from dump_completed_IO(). The code is
only exercised when EXT4FS_DEBUG is defined.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
2013-01-28 21:14:11 -05:00
Jan Kara
fe386132f6 ext4: fix ext4_writepage() to achieve data=ordered guarantees
So far ext4_writepage() skipped writing pages that had any delayed or
unwritten buffers attached. When blocksize < pagesize this breaks
data=ordered mode guarantees as we can have a page with one freshly
allocated buffer whose allocation is part of the committing
transaction and another buffer in the page which is delayed or
unwritten. So fix this problem by calling ext4_bio_writepage()
anyway. It will submit mapped buffers and leave others alone.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-28 21:06:42 -05:00
Jan Kara
8a850c3fb8 ext4: Make ext4_bio_writepage() handle unprepared buffers
So far ext4_bio_writepage() unconditionally cleared dirty bit on all
buffers underlying the page. That implicitely assumes we can write all
buffers. So far that is true because callers call into
ext4_bio_writepage() make sure all buffers in the page are mapped but:

a) it's a data corruption bug waiting to happen
b) in data=ordered mode when blocksize < pagesize we do need to write
   pages that may have only some of dirty buffers mapped.

So change ext4_bio_writepage() to skip buffers that cannot be written without
clearing their dirty bit.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-28 20:53:28 -05:00
Jan Kara
b6a8e62f8b ext4: simplify mpage_add_bh_to_extent()
The argument b_size of mpage_add_bh_to_extent() was bogus since it was
always == blocksize (which we can easily derive from inode->i_blkbits).
Also second branch of condition:
	if (nrblocks >= EXT4_MAX_TRANS_DATA) {
	} else if ((nrblocks + (b_size >> mpd->inode->i_blkbits)) >
						EXT4_MAX_TRANS_DATA) {
	}
was never taken because (b_size >> mpd->inode->i_blkbits) == 1.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-28 13:06:48 -05:00
Jan Kara
f8bec37037 ext4: dirty page has always buffers attached
ext4_writepage(), write_cache_pages_da(), and mpage_da_submit_io()
doesn't have to deal with the case when page doesn't have buffers. We
attach buffers to a page in ->write_begin() and ->page_mkwrite() which
covers all places where a page can become dirty.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-28 12:55:08 -05:00
Jan Kara
002bd7fa3a ext4: simplify list handling in ext4_do_flush_completed_IO()
The function splices i_completed_io_list to its private list
first.  From that moment on we don't need any lock for working with
io_end structures because all io_end structure on the list are only
our own. So we can remove the other two lists in the function and free
io_end immediately after we are done with it.

CC: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-28 09:49:15 -05:00
Jan Kara
84c17543ab ext4: move work from io_end to inode
It does not make much sense to have struct work in ext4_io_end_t
because we always use it for only one ext4_io_end_t per inode (the
first one in the i_completed_io list). So just move the structure to
inode itself.  This also allows for a small simplification in
processing io_end structures.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-28 09:43:46 -05:00
Jan Kara
fe089c77f1 ext4: remove __ext4_journalled_writepage() from mpage_da_submit_io()
We don't support delayed allocation in data=journal mode. So checking for it in
mpage_da_submit_io() doesn't make really sence. If we ever decide to extend
delayed allocation support to data=journal mode, adding
__ext4_journalled_writepage() call will be the least of problems we have to
solve. Most likely we'd have to implement separate writepages call anyways
because we don't have transaction credits for writing more than a single page
so mapping of page buffers would have to be done differently.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-28 09:38:49 -05:00
Jan Kara
1ae48a6354 ext4: use redirty_page_for_writepage() in ext4_bio_write_page()
When we cannot write a page we should use redirty_page_for_writepage()
instead of plain set_page_dirty(). That tells writeback code we have
problems, redirties only the page (redirtying buffers is not needed),
and updates mm accounting of failed page writes.

Also move clearing of buffer dirty flag after io_submit_add_bh(). At that
moment we are sure buffer will be going to disk.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-28 09:32:54 -05:00
Jan Kara
36ade451a5 ext4: Always use ext4_bio_write_page() for writeout
Currently we sometimes used block_write_full_page() and sometimes
ext4_bio_write_page() for writeback (depending on mount options and call
path). Let's always use ext4_bio_write_page() to simplify things a bit.

Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-28 09:30:52 -05:00
Zheng Liu
8bad6fc813 ext4: add punching hole support for non-extent-mapped files
This patch add supports for indirect file support punching hole.  It
is almost the same as ext4_ext_punch_hole.  First, we invalidate all
pages between this hole, and then we try to deallocate all blocks of
this hole.

A recursive function is used to handle deallocation of blocks.  In
this function, it iterates over the entries in inode's i_blocks or
indirect blocks, and try to free the block for each one of them.

After applying this patch, xfstest #255 will not pass w/o extent because
indirect-based file doesn't support unwritten extents.

Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-28 09:21:37 -05:00
Chen Gang
03dafb5f59 ext4: fix memory leak when quota options are specified multiple times
When usrjquota or grpjquota mount options are specified several times,
we leak memory storing the names. Free the memory correctly.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
2013-01-24 23:24:58 -05:00
Theodore Ts'o
72ba74508b ext4: release sysfs kobject when failing to enable quotas on mount
In addition, print the error returned from ext4_enable_quotas()

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Cc: stable@vger.kernel.org
2013-01-24 23:24:54 -05:00
Zheng Liu
aaddea812c ext4: add tracepoint in punching hole
This patch adds a tracepoint in ext4_punch_hole.

CC: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-16 20:21:26 -05:00
Theodore Ts'o
7f5118629f ext4: trigger the lazy inode table initialization after resize
After we have finished extending the file system, we need to trigger a
the lazy inode table thread to zero out the inode tables.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-13 08:41:45 -05:00
Eryu Guan
15b49132fc ext4: check bh in ext4_read_block_bitmap()
Validate the bh pointer before using it, since
ext4_read_block_bitmap_nowait() might return NULL.

I've seen this in fsfuzz testing.

 EXT4-fs error (device loop0): ext4_read_block_bitmap_nowait:385: comm touch: Cannot get buffer for block bitmap - block_group = 0, block_bitmap = 3925999616
 BUG: unable to handle kernel NULL pointer dereference at           (null)
 IP: [<ffffffff8121de25>] ext4_wait_block_bitmap+0x25/0xe0
 ...
 Call Trace:
  [<ffffffff8121e1e5>] ext4_read_block_bitmap+0x35/0x60
  [<ffffffff8125e9c6>] ext4_free_blocks+0x236/0xb80
  [<ffffffff811d0d36>] ? __getblk+0x36/0x70
  [<ffffffff811d0a5f>] ? __find_get_block+0x8f/0x210
  [<ffffffff81191ef3>] ? kmem_cache_free+0x33/0x140
  [<ffffffff812678e5>] ext4_xattr_release_block+0x1b5/0x1d0
  [<ffffffff812679be>] ext4_xattr_delete_inode+0xbe/0x100
  [<ffffffff81222a7c>] ext4_free_inode+0x7c/0x4d0
  [<ffffffff812277b8>] ? ext4_mark_inode_dirty+0x88/0x230
  [<ffffffff8122993c>] ext4_evict_inode+0x32c/0x490
  [<ffffffff811b8cd7>] evict+0xa7/0x1c0
  [<ffffffff811b8ed3>] iput_final+0xe3/0x170
  [<ffffffff811b8f9e>] iput+0x3e/0x50
  [<ffffffff812316fd>] ext4_add_nondir+0x4d/0x90
  [<ffffffff81231d0b>] ext4_create+0xeb/0x170
  [<ffffffff811aae9c>] vfs_create+0xac/0xd0
  [<ffffffff811ac845>] lookup_open+0x185/0x1c0
  [<ffffffff8129e3b9>] ? selinux_inode_permission+0xa9/0x170
  [<ffffffff811acb54>] do_last+0x2d4/0x7a0
  [<ffffffff811af743>] path_openat+0xb3/0x480
  [<ffffffff8116a8a1>] ? handle_mm_fault+0x251/0x3b0
  [<ffffffff811afc49>] do_filp_open+0x49/0xa0
  [<ffffffff811bbaad>] ? __alloc_fd+0xdd/0x150
  [<ffffffff8119da28>] do_sys_open+0x108/0x1f0
  [<ffffffff8119db51>] sys_open+0x21/0x30
  [<ffffffff81618959>] system_call_fastpath+0x16/0x1b

Also fix comment for ext4_read_block_bitmap_nowait()

Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org
2013-01-12 16:33:25 -05:00
Wang Shilong
aebf02430d ext4: use unlikely to improve the efficiency of the kernel
Because the function 'sb_getblk' seldomly fails to return NULL
value,it will be better to use 'unlikely' to optimize it.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-12 16:28:47 -05:00
Theodore Ts'o
860d21e2c5 ext4: return ENOMEM if sb_getblk() fails
The only reason for sb_getblk() failing is if it can't allocate the
buffer_head.  So ENOMEM is more appropriate than EIO.  In addition,
make sure that the file system is marked as being inconsistent if
sb_getblk() fails.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org
2013-01-12 16:19:36 -05:00
Guo Chao
fef0ebdb22 ext4: remove duplicate call to ext4_bread() in ext4_init_new_dir()
This fixes a buffer cache leak when creating a directory, introduced
in commit a774f9c20.

Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Tao Ma <boyu.mt@taobao.com>
2013-01-06 23:40:25 -05:00
Guo Chao
0ecaef0644 ext4: release buffer in failed path in dx_probe()
If checksum fails, we should also release the buffer
read from previous iteration.

Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>-
Cc: stable@vger.kernel.org
--
 fs/ext4/namei.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
2013-01-06 23:38:47 -05:00
Valerie Aurora
96465efee1 ext4: fix configuration dependencies for ext4 ACLs and security labels
Commit "ext4: Remove CONFIG_EXT4_FS_XATTR" removed the configuration
dependencies for ext4 xattrs from the ext4 ACLs and security labels
configuration options, but did not replace them with a dependency on
ext4 itself.  Add back the dependency on ext4 so the options only show
up if ext4 is enabled.

Signed-off-by: Valerie Aurora <val@vaaconsulting.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Tao Ma <boyu.mt@taobao.com>
2013-01-06 23:38:44 -05:00
Linus Torvalds
5439ca6b8f Various bug fixes for ext4. Perhaps the most serious bug fixed is one
which could cause file system corruptions when performing file punch
 operations.
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Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 bug fixes from Ted Ts'o:
 "Various bug fixes for ext4.  Perhaps the most serious bug fixed is one
  which could cause file system corruptions when performing file punch
  operations."

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: avoid hang when mounting non-journal filesystems with orphan list
  ext4: lock i_mutex when truncating orphan inodes
  ext4: do not try to write superblock on ro remount w/o journal
  ext4: include journal blocks in df overhead calcs
  ext4: remove unaligned AIO warning printk
  ext4: fix an incorrect comment about i_mutex
  ext4: fix deadlock in journal_unmap_buffer()
  ext4: split off ext4_journalled_invalidatepage()
  jbd2: fix assertion failure in jbd2_journal_flush()
  ext4: check dioread_nolock on remount
  ext4: fix extent tree corruption caused by hole punch
2013-01-02 09:57:34 -08:00
Theodore Ts'o
0e9a9a1ad6 ext4: avoid hang when mounting non-journal filesystems with orphan list
When trying to mount a file system which does not contain a journal,
but which does have a orphan list containing an inode which needs to
be truncated, the mount call with hang forever in
ext4_orphan_cleanup() because ext4_orphan_del() will return
immediately without removing the inode from the orphan list, leading
to an uninterruptible loop in kernel code which will busy out one of
the CPU's on the system.

This can be trivially reproduced by trying to mount the file system
found in tests/f_orphan_extents_inode/image.gz from the e2fsprogs
source tree.  If a malicious user were to put this on a USB stick, and
mount it on a Linux desktop which has automatic mounts enabled, this
could be considered a potential denial of service attack.  (Not a big
deal in practice, but professional paranoids worry about such things,
and have even been known to allocate CVE numbers for such problems.)

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Cc: stable@vger.kernel.org
2012-12-27 01:42:50 -05:00
Theodore Ts'o
721e3eba21 ext4: lock i_mutex when truncating orphan inodes
Commit c278531d39 added a warning when ext4_flush_unwritten_io() is
called without i_mutex being taken.  It had previously not been taken
during orphan cleanup since races weren't possible at that point in
the mount process, but as a result of this c278531d39, we will now see
a kernel WARN_ON in this case.  Take the i_mutex in
ext4_orphan_cleanup() to suppress this warning.

Reported-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Cc: stable@vger.kernel.org
2012-12-27 01:42:48 -05:00
Michael Tokarev
d096ad0f79 ext4: do not try to write superblock on ro remount w/o journal
When a journal-less ext4 filesystem is mounted on a read-only block
device (blockdev --setro will do), each remount (for other, unrelated,
flags, like suid=>nosuid etc) results in a series of scary messages
from kernel telling about I/O errors on the device.

This is becauese of the following code ext4_remount():

       if (sbi->s_journal == NULL)
                ext4_commit_super(sb, 1);

at the end of remount procedure, which forces writing (flushing) of
a superblock regardless whenever it is dirty or not, if the filesystem
is readonly or not, and whenever the device itself is readonly or not.

We only need call ext4_commit_super when the file system had been
previously mounted read/write.

Thanks to Eric Sandeen for help in diagnosing this issue.

Signed-off-By: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org
2012-12-25 14:08:16 -05:00
Eric Sandeen
0875a2b448 ext4: include journal blocks in df overhead calcs
To more accurately calculate overhead for "bsd" style
df reporting, we should count the journal blocks as
overhead as well.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Tested-by: Eric Whitney <enwlinux@gmail.com>
2012-12-25 13:56:01 -05:00
Eric Sandeen
a28a9178e8 ext4: remove unaligned AIO warning printk
Although I put this in, I now think it was a bad decision.  For most
users, there is very little to be done in this case.  They get the
message, once per day, with no real context or proposed action.  TBH,
it generates support calls when it probably does not need to; the
message sounds more dire than the situation really is.

Just nuke it.  Normal investigation via blktrace or whatnot can
reveal poor IO patterns if bad performance is encountered.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-12-25 13:33:13 -05:00
Andy Lutomirski
ad96f71155 ext4: fix an incorrect comment about i_mutex
i_mutex is not held when ->sync_file is called.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-12-25 13:31:52 -05:00
Jan Kara
53e872681f ext4: fix deadlock in journal_unmap_buffer()
We cannot wait for transaction commit in journal_unmap_buffer()
because we hold page lock which ranks below transaction start.  We
solve the issue by bailing out of journal_unmap_buffer() and
jbd2_journal_invalidatepage() with -EBUSY.  Caller is then responsible
for waiting for transaction commit to finish and try invalidation
again. Since the issue can happen only for page stradding i_size, it
is simple enough to manually call jbd2_journal_invalidatepage() for
such page from ext4_setattr(), check the return value and wait if
necessary.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-12-25 13:29:52 -05:00
Jan Kara
4520fb3c36 ext4: split off ext4_journalled_invalidatepage()
In data=journal mode we don't need delalloc or DIO handling in invalidatepage
and similarly in other modes we don't need the journal handling. So split
invalidatepage implementations.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-12-25 13:28:54 -05:00
Jan Kara
261cb20cb2 ext4: check dioread_nolock on remount
Currently we allow enabling dioread_nolock mount option on remount for
filesystems where blocksize < PAGE_CACHE_SIZE.  This isn't really
supported so fix the bug by moving the check for blocksize !=
PAGE_CACHE_SIZE into parse_options(). Change the original PAGE_SIZE to
PAGE_CACHE_SIZE along the way because that's what we are really
interested in.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Cc: stable@vger.kernel.org
2012-12-20 00:07:18 -05:00
Andrew Morton
965c8e59cf lseek: the "whence" argument is called "whence"
But the kernel decided to call it "origin" instead.  Fix most of the
sites.

Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-17 17:15:12 -08:00
Forrest Liu
c36575e663 ext4: fix extent tree corruption caused by hole punch
When depth of extent tree is greater than 1, logical start value of
interior node is not correctly updated in ext4_ext_rm_idx.

Signed-off-by: Forrest Liu <forrestl@synology.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Ashish Sangwan <ashishsangwan2@gmail.com>
Cc: stable@vger.kernel.org
2012-12-17 09:55:39 -05:00
Linus Torvalds
36cd5c19c3 There are two major features for this merge window. The first is
inline data, which allows small files or directories to be stored in
 the in-inode extended attribute area.  (This requires that the file
 system use inodes which are at least 256 bytes or larger; 128 byte
 inodes do not have any room for in-inode xattrs.)
 
 The second new feature is SEEK_HOLE/SEEK_DATA support.  This is
 enabled by the extent status tree patches, and this infrastructure
 will be used to further optimize ext4 in the future.
 
 Beyond that, we have the usual collection of code cleanups and bug
 fixes.
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Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 update from Ted Ts'o:
 "There are two major features for this merge window.  The first is
  inline data, which allows small files or directories to be stored in
  the in-inode extended attribute area.  (This requires that the file
  system use inodes which are at least 256 bytes or larger; 128 byte
  inodes do not have any room for in-inode xattrs.)

  The second new feature is SEEK_HOLE/SEEK_DATA support.  This is
  enabled by the extent status tree patches, and this infrastructure
  will be used to further optimize ext4 in the future.

  Beyond that, we have the usual collection of code cleanups and bug
  fixes."

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (63 commits)
  ext4: zero out inline data using memset() instead of empty_zero_page
  ext4: ensure Inode flags consistency are checked at build time
  ext4: Remove CONFIG_EXT4_FS_XATTR
  ext4: remove unused variable from ext4_ext_in_cache()
  ext4: remove redundant initialization in ext4_fill_super()
  ext4: remove redundant code in ext4_alloc_inode()
  ext4: use sync_inode_metadata() when syncing inode metadata
  ext4: enable ext4 inline support
  ext4: let fallocate handle inline data correctly
  ext4: let ext4_truncate handle inline data correctly
  ext4: evict inline data out if we need to strore xattr in inode
  ext4: let fiemap work with inline data
  ext4: let ext4_rename handle inline dir
  ext4: let empty_dir handle inline dir
  ext4: let ext4_delete_entry() handle inline data
  ext4: make ext4_delete_entry generic
  ext4: let ext4_find_entry handle inline data
  ext4: create a new function search_dir
  ext4: let ext4_readdir handle inline data
  ext4: let add_dir_entry handle inline data properly
  ...
2012-12-16 17:33:01 -08:00
Linus Torvalds
a2013a13e6 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
Pull trivial branch from Jiri Kosina:
 "Usual stuff -- comment/printk typo fixes, documentation updates, dead
  code elimination."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (39 commits)
  HOWTO: fix double words typo
  x86 mtrr: fix comment typo in mtrr_bp_init
  propagate name change to comments in kernel source
  doc: Update the name of profiling based on sysfs
  treewide: Fix typos in various drivers
  treewide: Fix typos in various Kconfig
  wireless: mwifiex: Fix typo in wireless/mwifiex driver
  messages: i2o: Fix typo in messages/i2o
  scripts/kernel-doc: check that non-void fcts describe their return value
  Kernel-doc: Convention: Use a "Return" section to describe return values
  radeon: Fix typo and copy/paste error in comments
  doc: Remove unnecessary declarations from Documentation/accounting/getdelays.c
  various: Fix spelling of "asynchronous" in comments.
  Fix misspellings of "whether" in comments.
  eisa: Fix spelling of "asynchronous".
  various: Fix spelling of "registered" in comments.
  doc: fix quite a few typos within Documentation
  target: iscsi: fix comment typos in target/iscsi drivers
  treewide: fix typo of "suport" in various comments and Kconfig
  treewide: fix typo of "suppport" in various comments
  ...
2012-12-13 12:00:02 -08:00
Theodore Ts'o
bd9926e803 ext4: zero out inline data using memset() instead of empty_zero_page
Not all architectures (in particular, sparc64) have empty_zero_page.
So instead of copying from empty_zero_page, use memset to clear the
inline data by signalling to ext4_xattr_set_entry() via a magic
pointer value, EXT4_ZERO_ATTR_VALUE, which is defined by casting -1 to
a pointer.

This fixes a build failure on sparc64, and the memset() should be more
efficient than using memcpy() anyway.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-12-11 03:31:49 -05:00
Carlos Maiolino
9a4c801947 ext4: ensure Inode flags consistency are checked at build time
Flags being used by atomic operations in inode flags (e.g.
ext4_test_inode_flag(), should be consistent with that actually stored
in inodes, i.e.: EXT4_XXX_FL.

It ensures that this consistency is checked at build-time, not at
run-time.

Currently, the flags consistency are being checked at run-time, but,
there is no real reason to not do a build-time check instead of a
run-time check. The code is comparing macro defined values with enum
type variables, where both are constants, so, there is no problem in
comparing constants at build-time.

enum variables are treated as constants by the C compiler, according
to the C99 specs (see www.open-std.org/jtc1/sc22/wg14/www/docs/n1124.pdf 
sec. 6.2.5, item 16), so, there is no real problem in comparing an
enumeration type at build time

Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-12-10 16:30:45 -05:00
Tao Ma
939da10844 ext4: Remove CONFIG_EXT4_FS_XATTR
Ted has sent out a RFC about removing this feature. Eric and Jan
confirmed that both RedHat and SUSE enable this feature in all their
product.  David also said that "As far as I know, it's enabled in all
Android kernels that use ext4."  So it seems OK for us.

And what's more, as inline data depends its implementation on xattr,
and to be frank, I don't run any test again inline data enabled while
xattr disabled.  So I think we should add inline data and remove this
config option in the same release.

[ The savings if you disable CONFIG_EXT4_FS_XATTR is only 27k, which
  isn't much in the grand scheme of things.  Since no one seems to be
  testing this configuration except for some automated compile farms, on
  balance we are better removing this config option, and so that it is
  effectively always enabled. -- tytso ]

Cc: David Brown <davidb@codeaurora.org>
Cc: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-12-10 16:30:43 -05:00
Zhi Yong Wu
187fd030d8 ext4: remove unused variable from ext4_ext_in_cache()
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Reviewed-by: Zheng Liu <gnehzuil.liu@gmail.com>
2012-12-10 14:06:04 -05:00