1. 06 Jun, 2012 1 commit
  2. 05 Jun, 2012 23 commits
  3. 04 Jun, 2012 14 commits
  4. 03 Jun, 2012 2 commits
    • Linus Torvalds's avatar
      vfs: move inode stat information closer together · 2f9d3df8
      Linus Torvalds authored
      The comment above it says "Stat data, not accessed from path walking",
      but in fact some of inode fields we use for the common stat data was way
      down at the end of the inode, causing unnecessary cache misses for the
      common stat operations.
      
      The inode structure is pretty big, and this can change padding depending
      on field width, but at least on the common 64-bit configurations this
      doesn't change the size.  Some of our inode layout has historically been
      to tro to avoid unnecessary padding fields, but cache locality is at
      least as important for layout, if not more.
      
      Noticed by looking at kernel profiles, and noticing that the "i_blkbits"
      access stood out like a sore thumb.
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      2f9d3df8
    • Nicholas Bellinger's avatar
      target/file: Use O_DSYNC by default for FILEIO backends · a4dff304
      Nicholas Bellinger authored
      Convert to use O_DSYNC for all cases at FILEIO backend creation time to
      avoid the extra syncing of pure timestamp updates with legacy O_SYNC during
      default operation as recommended by hch.  Continue to do this independently of
      Write Cache Enable (WCE) bit, as WCE=0 is currently the default for all backend
      devices and enabled by user on per device basis via attrib/emulate_write_cache.
      
      This patch drops the now unnecessary fd_buffered_io= token usage that was
      originally signalling when to explictly disable O_SYNC at backend creation
      time for buffered I/O operation.  This can end up being dangerous for a number
      of reasons during physical node failure, so go ahead and drop this option
      for now when O_DSYNC is used as the default.
      
      Also allow explict FUA WRITEs -> vfs_fsync_range() call to function in
      fd_execute_cmd() independently of WCE bit setting.
      Reported-by: default avatarChristoph Hellwig <hch@lst.de>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
      a4dff304