1. 14 Jun, 2010 1 commit
  2. 17 May, 2010 1 commit
  3. 30 Mar, 2010 1 commit
    • Tejun Heo's avatar
      include cleanup: Update gfp.h and slab.h includes to prepare for breaking... · 5a0e3ad6
      Tejun Heo authored
      include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
      
      percpu.h is included by sched.h and module.h and thus ends up being
      included when building most .c files.  percpu.h includes slab.h which
      in turn includes gfp.h making everything defined by the two files
      universally available and complicating inclusion dependencies.
      
      percpu.h -> slab.h dependency is about to be removed.  Prepare for
      this change by updating users of gfp and slab facilities include those
      headers directly instead of assuming availability.  As this conversion
      needs to touch large number of source files, the following script is
      used as the basis of conversion.
      
        http://userweb.kernel.org/~tj/misc/slabh-sweep.py
      
      The script does the followings.
      
      * Scan files for gfp and slab usages and update includes such that
        only the necessary includes are there.  ie. if only gfp is used,
        gfp.h, if slab is used, slab.h.
      
      * When the script inserts a new include, it looks at the include
        blocks and try to put the new include such that its order conforms
        to its surrounding.  It's put in the include block which contains
        core kernel includes, in the same order that the rest are ordered -
        alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
        doesn't seem to be any matching order.
      
      * If the script can't find a place to put a new include (mostly
        because the file doesn't have fitting include block), it prints out
        an error message indicating which .h file needs to be added to the
        file.
      
      The conversion was done in the following steps.
      
      1. The initial automatic conversion of all .c files updated slightly
         over 4000 files, deleting around 700 includes and adding ~480 gfp.h
         and ~3000 slab.h inclusions.  The script emitted errors for ~400
         files.
      
      2. Each error was manually checked.  Some didn't need the inclusion,
         some needed manual addition while adding it to implementation .h or
         embedding .c file was more appropriate for others.  This step added
         inclusions to around 150 files.
      
      3. The script was run again and the output was compared to the edits
         from #2
      
       to make sure no file was left behind.
      
      4. Several build tests were done and a couple of problems were fixed.
         e.g. lib/decompress_*.c used malloc/free() wrappers around slab
         APIs requiring slab.h to be added manually.
      
      5. The script was run on all .h files but without automatically
         editing them as sprinkling gfp.h and slab.h inclusions around .h
         files could easily lead to inclusion dependency hell.  Most gfp.h
         inclusion directives were ignored as stuff from gfp.h was usually
         wildly available and often used in preprocessor macros.  Each
         slab.h inclusion directive was examined and added manually as
         necessary.
      
      6. percpu.h was updated not to include slab.h.
      
      7. Build test were done on the following configurations and failures
         were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
         distributed build env didn't work with gcov compiles) and a few
         more options had to be turned off depending on archs to make things
         build (like ipr on powerpc/64 which failed due to missing writeq).
      
         * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
         * powerpc and powerpc64 SMP allmodconfig
         * sparc and sparc64 SMP allmodconfig
         * ia64 SMP allmodconfig
         * s390 SMP allmodconfig
         * alpha SMP allmodconfig
         * um on x86_64 SMP allmodconfig
      
      8. percpu.h modifications were reverted so that it could be applied as
         a separate patch and serve as bisection point.
      
      Given the fact that I had only a couple of failures from tests on step
      6, I'm fairly confident about the coverage of this conversion patch.
      If there is a breakage, it's likely to be something in one of the arch
      headers which should be easily discoverable easily on most builds of
      the specific arch.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Guess-its-ok-by: default avatarChristoph Lameter <cl@linux-foundation.org>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
      5a0e3ad6
  4. 02 Mar, 2010 1 commit
  5. 24 Jan, 2010 1 commit
    • Theodore Ts'o's avatar
      ext4: Use bitops to read/modify EXT4_I(inode)->i_state · 19f5fb7a
      Theodore Ts'o authored
      
      
      At several places we modify EXT4_I(inode)->i_state without holding
      i_mutex (ext4_release_file, ext4_bmap, ext4_journalled_writepage,
      ext4_do_update_inode, ...). These modifications are racy and we can
      lose updates to i_state. So convert handling of i_state to use bitops
      which are atomic.
      
      Cc: Jan Kara <jack@suse.cz>
      Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      19f5fb7a
  6. 09 Dec, 2009 1 commit
  7. 23 Nov, 2009 1 commit
    • Theodore Ts'o's avatar
      ext4: call ext4_forget() from ext4_free_blocks() · e6362609
      Theodore Ts'o authored
      
      
      Add the facility for ext4_forget() to be called from
      ext4_free_blocks().  This simplifies the code in a large number of
      places, and centralizes most of the work of calling ext4_forget() into
      a single place.
      
      Also fix a bug in the extents migration code; it wasn't calling
      ext4_forget() when releasing the indirect blocks during the
      conversion.  As a result, if the system cashed during or shortly after
      the extents migration, and the released indirect blocks get reused as
      data blocks, the journal replay would corrupt the data blocks.  With
      this new patch, fixing this bug was as simple as adding the
      EXT4_FREE_BLOCKS_FORGET flags to the call to ext4_free_blocks().
      Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
      e6362609
  8. 28 Sep, 2009 1 commit
    • Mingming Cao's avatar
      ext4: Split uninitialized extents for direct I/O · 0031462b
      Mingming Cao authored
      
      
      When writing into an unitialized extent via direct I/O, and the direct
      I/O doesn't exactly cover the unitialized extent, split the extent
      into uninitialized and initialized extents before submitting the I/O.
      This avoids needing to deal with an ENOSPC error in the end_io
      callback that gets used for direct I/O.
      
      When the IO is complete, the written extent will be marked as initialized.
      
      Singed-Off-By: Mingming Cao <cmm@us.ibm.com> 
      Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      0031462b
  9. 17 Sep, 2009 1 commit
    • Theodore Ts'o's avatar
      ext4: store EXT4_EXT_MIGRATE in i_state instead of i_flags · 1b9c12f4
      Theodore Ts'o authored
      
      
      EXT4_EXT_MIGRATE is only intended to be used for an in-memory flag,
      and the hex value assigned to it collides with FS_DIRECTIO_FL (which
      is also stored in i_flags).  There's no reason for the
      EXT4_EXT_MIGRATE bit to be stored in i_flags, so we switch it to use
      i_state instead.
      
      Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
      Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      1b9c12f4
  10. 26 Aug, 2009 1 commit
    • Aneesh Kumar K.V's avatar
      ext4: Add missing unlock_new_inode() call in extent migration code · a8526e84
      Aneesh Kumar K.V authored
      
      
      We need to unlock the new inode before iput.  This patch fixes the
      following warning when calling chattr +e to migrate a file to use
      extents.  It also fixes problems in when e4defrag attempts to
      defragment an inode.
      
      [  470.400044] ------------[ cut here ]------------
      [  470.400065] WARNING: at fs/inode.c:1210 generic_delete_inode+0x65/0x16a()
      [  470.400072] Hardware name: N/A
      .....
      ...
      [  470.400353] Pid: 4451, comm: chattr Not tainted 2.6.31-rc7-red-debug #4
      [  470.400359] Call Trace:
      [  470.400372]  [<ffffffff81037771>] warn_slowpath_common+0x77/0x8f
      [  470.400385]  [<ffffffff81037798>] warn_slowpath_null+0xf/0x11
      [  470.400395]  [<ffffffff810b7f28>] generic_delete_inode+0x65/0x16a
      [  470.400405]  [<ffffffff810b8044>] generic_drop_inode+0x17/0x1bd
      [  470.400413]  [<ffffffff810b7083>] iput+0x61/0x65
      [  470.400455]  [<ffffffffa003b229>] ext4_ext_migrate+0x5eb/0x66a [ext4]
      [  470.400492]  [<ffffffffa002b1f8>] ext4_ioctl+0x340/0x756 [ext4]
      [  470.400507]  [<ffffffff810b1a91>] vfs_ioctl+0x1d/0x82
      [  470.400517]  [<ffffffff810b1ff0>] do_vfs_ioctl+0x483/0x4c9
      [  470.400527]  [<ffffffff81059c30>] ? trace_hardirqs_on+0xd/0xf
      [  470.400537]  [<ffffffff810b2087>] sys_ioctl+0x51/0x74
      [  470.400549]  [<ffffffff8100ba6b>] system_call_fastpath+0x16/0x1b
      [  470.400557] ---[ end trace ab85723542352dac ]---
      Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
      Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      a8526e84
  11. 13 Jun, 2009 2 commits
    • Andreas Dilger's avatar
      ext4: teach the inode allocator to use a goal inode number · 11013911
      Andreas Dilger authored
      
      
      Enhance the inode allocator to take a goal inode number as a
      paremeter; if it is specified, it takes precedence over Orlov or
      parent directory inode allocation algorithms.
      
      The extents migration function uses the goal inode number so that the
      extent trees allocated the migration function use the correct flex_bg.
      In the future, the goal inode functionality will also be used to
      allocate an adjacent inode for the extended attributes.
      
      Also, for testing purposes the goal inode number can be specified via
      /sys/fs/{dev}/inode_goal.  This can be useful for testing inode
      allocation beyond 2^32 blocks on very large filesystems.
      Signed-off-by: default avatarAndreas Dilger <adilger@sun.com>
      Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      11013911
    • Theodore Ts'o's avatar
      ext4: Use a hash of the topdir directory name for the Orlov parent group · f157a4aa
      Theodore Ts'o authored
      
      
      Instead of using a random number to determine the goal parent grop for
      the Orlov top directories, use a hash of the directory name.  This
      allows for repeatable results when trying to benchmark filesystem
      layout algorithms.
      Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      f157a4aa
  12. 16 Feb, 2009 1 commit
  13. 06 Jan, 2009 1 commit
    • Theodore Ts'o's avatar
      ext4: Remove "extents" mount option · 83982b6f
      Theodore Ts'o authored
      
      
      This mount option is largely superfluous, and in fact the way it was
      implemented was buggy; if a filesystem which did not have the extents
      feature flag was mounted -o extents, the filesystem would attempt to
      create and use extents-based file even though the extents feature flag
      was not eabled.  The simplest thing to do is to nuke the mount option
      entirely.  It's not all that useful to force the non-creation of new
      extent-based files if the filesystem can support it.
      Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      83982b6f
  14. 07 Jan, 2009 1 commit
    • Frank Mayhar's avatar
      ext4: Allow ext4 to run without a journal · 0390131b
      Frank Mayhar authored
      
      
      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: default avatarFrank Mayhar <fmayhar@google.com>
      Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      0390131b
  15. 13 Sep, 2008 1 commit
  16. 20 Aug, 2008 1 commit
  17. 29 Apr, 2008 2 commits
  18. 25 Feb, 2008 1 commit
  19. 10 Feb, 2008 1 commit
  20. 05 Feb, 2008 1 commit
  21. 29 Jan, 2008 2 commits