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  1. 29 9月, 2012 2 次提交
  3. 05 9月, 2012 2 次提交
    • T
      ext4: grow the s_group_info array as needed · 28623c2f
      由 Theodore Ts'o 提交于 
      Previously we allocated the s_group_info array with enough space for
any future possible growth of the file system via online resize.  This
is unfortunate because it wastes memory, and it doesn't work for the
meta_bg scheme, since there is no limit based on the number of
reserved gdt blocks.  So add the code to grow the s_group_info array
as needed.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      28623c2f
    • T
      ext4: grow the s_flex_groups array as needed when resizing · 117fff10
      由 Theodore Ts'o 提交于 
      Previously, we allocated the s_flex_groups array to the maximum size
that the file system could be resized.  There was two problems with
this approach.  First, it wasted memory in the common case where the
file system was not resized.  Secondly, once we start allowing online
resizing using the meta_bg scheme, there is no maximum size that the
file system can be resized.  So instead, we need to grow the
s_flex_groups at inline resize time.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      117fff10
  5. 17 8月, 2012 2 次提交
    • Z
      ext4: make the zero-out chunk size tunable · 67a5da56
      由 Zheng Liu 提交于 
      Currently in ext4 the length of zero-out chunk is set to 7 file system
blocks.  But if an inode has uninitailized extents from using
fallocate to preallocate space, and the workload issues many random
writes, this can cause a fragmented extent tree that will
unnecessarily grow the extent tree.

So create a new sysfs tunable, extent_max_zeroout_kb, which controls
the maximum size where blocks will be zeroed out instead of creating a
new uninitialized extent.  The default of this has been sent to 32kb.

CC: Zach Brown <zab@zabbo.net>
CC: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: NZheng Liu <wenqing.lz@taobao.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      67a5da56
    • T
      ext4: add max_dir_size_kb mount option · df981d03
      由 Theodore Ts'o 提交于 
      Very large directories can cause significant performance problems, or
perhaps even invoke the OOM killer, if the process is running in a
highly constrained memory environment (whether it is VM's with a small
amount of memory or in a small memory cgroup).

So it is useful, in cloud server/data center environments, to be able
to set a filesystem-wide cap on the maximum size of a directory, to
ensure that directories never get larger than a sane size.  We do this
via a new mount option, max_dir_size_kb.  If there is an attempt to
grow the directory larger than max_dir_size_kb, the system call will
return ENOSPC instead.

Google-Bug-Id: 6863013
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      df981d03
  7. 23 7月, 2012 3 次提交
  9. 10 7月, 2012 2 次提交
    • Z
      ext4: add a new nolock flag in ext4_map_blocks · 729f52c6
      由 Zheng Liu 提交于 
      EXT4_GET_BLOCKS_NO_LOCK flag is added to indicate that we don't need
to acquire i_data_sem lock in ext4_map_blocks.  Meanwhile, it changes
ext4_get_block() to not start a new journal because when we do a
overwrite dio, there is no any metadata that needs to be modified.

We define a new function called ext4_get_block_write_nolock, which is
used in dio overwrite nolock.  In this function, it doesn't try to
acquire i_data_sem lock and doesn't start a new journal as it does a
lookup.

CC: Tao Ma <tm@tao.ma>
CC: Eric Sandeen <sandeen@redhat.com>
CC: Robin Dong <hao.bigrat@gmail.com>
Signed-off-by: NZheng Liu <wenqing.lz@taobao.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      729f52c6
    • T
      ext4: fix overhead calculation used by ext4_statfs() · 952fc18e
      由 Theodore Ts'o 提交于 
      Commit f975d6bc introduced bug which caused ext4_statfs() to
miscalculate the number of file system overhead blocks.  This causes
the f_blocks field in the statfs structure to be larger than it should
be.  This would in turn cause the "df" output to show the number of
data blocks in the file system and the number of data blocks used to
be larger than they should be.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
      952fc18e
  11. 01 7月, 2012 1 次提交
  13. 31 5月, 2012 1 次提交
  15. 29 5月, 2012 1 次提交
  17. 27 5月, 2012 1 次提交
  19. 16 5月, 2012 1 次提交
  21. 30 4月, 2012 9 次提交
  23. 17 4月, 2012 1 次提交
  25. 20 3月, 2012 1 次提交
  27. 19 3月, 2012 1 次提交
  29. 05 3月, 2012 3 次提交
    • C
      ext4: add comments to definition of ext4_io_end_t · 4188188b
      由 Curt Wohlgemuth 提交于 
      This should make it more clear what this structure is used
for, and how some of the (mutually exclusive) fields are
used to keep page cache references.
Signed-off-by: NCurt Wohlgemuth <curtw@google.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      4188188b
    • J
      ext4: fix race between sync and completed io work · 491caa43
      由 Jeff Moyer 提交于 
      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 b82e384c ("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: NJeff Moyer <jmoyer@redhat.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
CC: stable@kernel.org
      491caa43
    • T
      ext4: make ext4_show_options() be table-driven · 5a916be1
      由 Theodore Ts'o 提交于 
      Consistently show mount options which are the non-default, so that
/proc/mounts accurately shows the mount options that would be
necessary to mount the file system in its current mode of operation.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      5a916be1
  31. 04 3月, 2012 1 次提交
  33. 03 3月, 2012 1 次提交
  35. 21 2月, 2012 3 次提交
    • J
      ext4: fix race between unwritten extent conversion and truncate · 266991b1
      由 Jeff Moyer 提交于 
      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: NJan Kara <jack@suse.cz>
Signed-off-by: NJeff Moyer <jmoyer@redhat.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org
      266991b1
    • T
      ext4: fix INCOMPAT feature codepoint reservation for INLINEDATA · 856cbcf9
      由 Theodore Ts'o 提交于 
      In commit 9b90e5e0 I incorrectly reserved the wrong bit for
EXT4_FEATURE_INCOMPAT_INLINEDATA per the discussion on the linux-ext4
list on December 7, 2011.  The codepoint 0x2000 should be used for
EXT4_FEATURE_INCOMPAT_USE_META_CSUM, so INLINEDATA will be assigned
the value 0x8000.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      856cbcf9
    • T
      ext4: fix race when setting bitmap_uptodate flag · 813e5727
      由 Theodore Ts'o 提交于 
      In ext4_read_{inode,block}_bitmap() we were setting bitmap_uptodate()
before submitting the buffer for read.  The is bad, since we check
bitmap_uptodate() without locking the buffer, and so if another
process is racing with us, it's possible that they will think the
bitmap is uptodate even though the read has not completed yet,
resulting in inodes and blocks potentially getting allocated more than
once if we get really unlucky.

Addresses-Google-Bug: 2828254
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      813e5727
  37. 05 1月, 2012 3 次提交
  39. 04 1月, 2012 1 次提交