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  1. 26 11月, 2008 1 次提交
    • J
      jbd2: improve jbd2 fsync batching · e07f7183
      由 Josef Bacik 提交于 
      This patch removes the static sleep time in favor of a more self
optimizing approach where we measure the average amount of time it
takes to commit a transaction to disk and the ammount of time a
transaction has been running.  If somebody does a sync write or an
fsync() traditionally we would sleep for 1 jiffies, which depending on
the value of HZ could be a significant amount of time compared to how
long it takes to commit a transaction to the underlying storage.  With
this patch instead of sleeping for a jiffie, we check to see if the
amount of time this transaction has been running is less than the
average commit time, and if it is we sleep for the delta using
schedule_hrtimeout to give us a higher precision sleep time.  This
greatly benefits high end storage where you could end up sleeping for
longer than it takes to commit the transaction and therefore sitting
idle instead of allowing the transaction to be committed by keeping
the sleep time to a minimum so you are sure to always be doing
something.
Signed-off-by: NJosef Bacik <jbacik@redhat.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      e07f7183
  3. 06 1月, 2009 3 次提交
    • A
      ext4: Don't overwrite allocation_context ac_status · 032115fc
      由 Aneesh Kumar K.V 提交于 
      We can call ext4_mb_check_limits even after successfully allocating
the requested blocks.  In that case, make sure we don't overwrite
ac_status if it already has the status AC_STATUS_FOUND.  This fixes
the lockdep warning:

=============================================
[ INFO: possible recursive locking detected ]
2.6.28-rc6-autokern1 #1
---------------------------------------------
fsstress/11948 is trying to acquire lock:
 (&meta_group_info[i]->alloc_sem){----}, at: [<c04d9a49>] ext4_mb_load_buddy+0x9f/0x278
.....

stack backtrace:
.....
 [<c04db974>] ext4_mb_regular_allocator+0xbb5/0xd44
.....

but task is already holding lock:
 (&meta_group_info[i]->alloc_sem){----}, at: [<c04d9a49>] ext4_mb_load_buddy+0x9f/0x278
Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
      032115fc
    • T
      ext4: remove extraneous newlines from calls to ext4_error() and ext4_warning() · fde4d95a
      由 Theodore Ts'o 提交于 
      This removes annoying blank syslog entries emitted by ext4_error() or
ext4_warning(), since these functions add their own newline.
Signed-off-by: NNick Warne <nick@ukfsn.org>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      fde4d95a
    • T
      jbd2: Add barrier not supported test to journal_wait_on_commit_record · fd98496f
      由 Theodore Ts'o 提交于 
      Xen doesn't report that barriers are not supported until buffer I/O is
reported as completed, instead of when the buffer I/O is submitted.
Add a check and a fallback codepath to journal_wait_on_commit_record()
to detect this case, so that attempts to mount ext4 filesystems on
LVM/devicemapper devices on Xen guests don't blow up with an "Aborting
journal on device XXX"; "Remounting filesystem read-only" error.

Thanks to Andreas Sundstrom for reporting this issue.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
      fd98496f
  5. 07 1月, 2009 1 次提交
    • F
      ext4: Allow ext4 to run without a journal · 0390131b
      由 Frank Mayhar 提交于 
      A few weeks ago I posted a patch for discussion that allowed ext4 to run
without a journal.  Since that time I've integrated the excellent
comments from Andreas and fixed several serious bugs.  We're currently
running with this patch and generating some performance numbers against
both ext2 (with backported reservations code) and ext4 with and without
a journal.  It just so happens that running without a journal is
slightly faster for most everything.

We did
	iozone -T -t 4 s 2g -r 256k -T -I -i0 -i1 -i2

which creates 4 threads, each of which create and do reads and writes on
a 2G file, with a buffer size of 256K, using O_DIRECT for all file opens
to bypass the page cache.  Results:

                     ext2        ext4, default   ext4, no journal
  initial writes   13.0 MB/s        15.4 MB/s          15.7 MB/s
  rewrites         13.1 MB/s        15.6 MB/s          15.9 MB/s
  reads            15.2 MB/s        16.9 MB/s          17.2 MB/s
  re-reads         15.3 MB/s        16.9 MB/s          17.2 MB/s
  random readers    5.6 MB/s         5.6 MB/s           5.7 MB/s
  random writers    5.1 MB/s         5.3 MB/s           5.4 MB/s 

So it seems that, so far, this was a useful exercise.
Signed-off-by: NFrank Mayhar <fmayhar@google.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      0390131b
  7. 17 12月, 2008 1 次提交
  9. 27 11月, 2008 1 次提交
  11. 26 11月, 2008 3 次提交
  13. 06 1月, 2009 2 次提交
  15. 05 11月, 2008 1 次提交
    • T
      ext4: tone down ext4_da_writepages warnings · 2a21e37e
      由 Theodore Ts'o 提交于 
      If the filesystem has errors, ext4_da_writepages() will return a *lot*
of errors, including lots and lots of stack dumps.  While it's true
that we are dropping user data on the floor, which is unfortunate, the
stack dumps aren't helpful, and they tend to obscure the true original
root cause of the problem.  So in the case where the filesystem has
aborted, return an EROFS right away.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      2a21e37e
  17. 13 12月, 2008 1 次提交
    • T
      ext4: remove do_blk_alloc() · 97df5d15
      由 Theodore Ts'o 提交于 
      The convenience function do_blk_alloc() is a static function with only
one caller, so fold it into ext4_new_meta_blocks() to simplify the
code and to make it easier to understand.

To save more stack space, if count is a null pointer in
ext4_new_meta_blocks() assume that caller wanted a single block (and
if there is an error, no blocks were allocated).
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      97df5d15
  19. 08 12月, 2008 1 次提交
    • T
      ext4: remove ext4_new_meta_block() · cfe82c85
      由 Theodore Ts'o 提交于 
      There were only two one callers of the function ext4_new_meta_block(),
which just a very simpler wrapper function around
ext4_new_meta_blocks().  Change those two functions to call
ext4_new_meta_blocks() directly, to save code and stack space usage.
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
      cfe82c85
  21. 02 1月, 2009 1 次提交
  23. 07 1月, 2009 1 次提交
  25. 07 12月, 2008 1 次提交
  27. 29 10月, 2008 2 次提交
  29. 30 10月, 2008 1 次提交
  31. 05 1月, 2009 19 次提交