1. 23 Sep, 2014 2 commits
    • Jaegeuk Kim's avatar
      f2fs: do not skip latest inode information · 19c9c466
      Jaegeuk Kim authored
      
      
      In f2fs_sync_file, if there is no written appended writes, it skips
      to write its node blocks.
      But, if there is up-to-date inode page, we should write it to update
      its metadata during the roll-forward recovery.
      Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
      19c9c466
    • Jaegeuk Kim's avatar
      f2fs: fix conditions to remain recovery information in f2fs_sync_file · 88bd02c9
      Jaegeuk Kim authored
      This patch revisited whole the recovery information during the f2fs_sync_file.
      
      In this patch, there are three information to make a decision.
      
      a) IS_CHECKPOINTED,	/* is it checkpointed before? */
      b) HAS_FSYNCED_INODE,	/* is the inode fsynced before? */
      c) HAS_LAST_FSYNC,	/* has the latest node fsync mark? */
      
      And, the scenarios for our rule are based on:
      
      [Term] F: fsync_mark, D: dentry_mark
      
      1. inode(x) | CP | inode(x) | dnode(F)
      2. inode(x) | CP | inode(F) | dnode(F)
      3. inode(x) | CP | dnode(F) | inode(x) | inode(F)
      4. inode(x) | CP | dnode(F) | inode(F)
      5. CP | inode(x) | dnode(F) | inode(DF)
      6. CP | inode(DF) | dnode(F)
      7. CP | dnode(F) | inode(DF)
      8. CP | dnode(F) | inode(x) | inode(DF)
      
      For example, #3, the three conditions should be changed as follows.
      
         inode(x) | CP | dnode(F) | inode(x) | inode(F)
      a)    x       o      o          o          o
      b)    x       x      x          x          o
      c)    x       o      o          x          o
      
      If f2fs_sync_file stops   ------^,
       it should write inode(F)    --------------^
      
      So, the need_inode_block_update should return true, since
       c) get_nat_flag(e, HAS_LAST_FSYNC), is false.
      
      For example, #8
      
      ,
            CP | alloc | dnode(F) | inode(x) | inode(DF)
      a)    o      x        x          x          x
      b)    x               x          x          o
      c)    o               o          x          o
      
      If f2fs_sync_file stops   -------^,
       it should write inode(DF)    --------------^
      
      Note that, the roll-forward policy should follow this rule, which means,
      if there are any missing blocks, we doesn't need to recover that inode.
      Signed-off-by: default avatarHuang Ying <ying.huang@intel.com>
      Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
      88bd02c9
  2. 16 Sep, 2014 1 commit
    • Jaegeuk Kim's avatar
      f2fs: give an option to enable in-place-updates during fsync to users · c1ce1b02
      Jaegeuk Kim authored
      
      
      If user wrote F2FS_IPU_FSYNC:4 in /sys/fs/f2fs/ipu_policy, f2fs_sync_file
      only starts to try in-place-updates.
      And, if the number of dirty pages is over /sys/fs/f2fs/min_fsync_blocks, it
      keeps out-of-order manner. Otherwise, it triggers in-place-updates.
      
      This may be used by storage showing very high random write performance.
      
      For example, it can be used when,
      
      Seq. writes (Data) + wait + Seq. writes (Node)
      
      is pretty much slower than,
      
      Rand. writes (Data)
      Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
      c1ce1b02
  3. 11 Sep, 2014 1 commit
  4. 09 Sep, 2014 2 commits
  5. 04 Sep, 2014 1 commit
  6. 21 Aug, 2014 2 commits
  7. 19 Aug, 2014 2 commits
  8. 04 Aug, 2014 1 commit
  9. 31 Jul, 2014 1 commit
  10. 30 Jul, 2014 2 commits
  11. 09 Jul, 2014 2 commits
  12. 23 Jun, 2014 2 commits
  13. 12 Jun, 2014 1 commit
    • Al Viro's avatar
      ->splice_write() via ->write_iter() · 8d020765
      Al Viro authored
      
      
      iter_file_splice_write() - a ->splice_write() instance that gathers the
      pipe buffers, builds a bio_vec-based iov_iter covering those and feeds
      it to ->write_iter().  A bunch of simple cases coverted to that...
      
      [AV: fixed the braino spotted by Cyrill]
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      8d020765
  14. 07 Jun, 2014 1 commit
  15. 06 Jun, 2014 1 commit
  16. 07 May, 2014 5 commits
  17. 06 May, 2014 2 commits
  18. 07 Apr, 2014 2 commits
    • Kirill A. Shutemov's avatar
      mm: implement ->map_pages for page cache · f1820361
      Kirill A. Shutemov authored
      
      
      filemap_map_pages() is generic implementation of ->map_pages() for
      filesystems who uses page cache.
      
      It should be safe to use filemap_map_pages() for ->map_pages() if
      filesystem use filemap_fault() for ->fault().
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Andi Kleen <ak@linux.intel.com>
      Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: Dave Chinner <david@fromorbit.com>
      Cc: Ning Qu <quning@gmail.com>
      Cc: Hugh Dickins <hughd@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      f1820361
    • Jaegeuk Kim's avatar
      f2fs: introduce f2fs_issue_flush to avoid redundant flush issue · 6b4afdd7
      Jaegeuk Kim authored
      
      
      Some storage devices show relatively high latencies to complete cache_flush
      commands, even though their normal IO speed is prettry much high. In such
      the case, it needs to merge cache_flush commands as much as possible to avoid
      issuing them redundantly.
      So, this patch introduces a mount option, "-o flush_merge", to mitigate such
      the overhead.
      
      If this option is enabled by user, F2FS merges the cache_flush commands and then
      issues just one cache_flush on behalf of them. Once the single command is
      finished, F2FS sends a completion signal to all the pending threads.
      
      Note that, this option can be used under a workload consisting of very intensive
      concurrent fsync calls, while the storage handles cache_flush commands slowly.
      Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
      6b4afdd7
  19. 20 Mar, 2014 3 commits
  20. 03 Mar, 2014 1 commit
  21. 17 Feb, 2014 1 commit
  22. 26 Jan, 2014 1 commit
  23. 20 Jan, 2014 1 commit
  24. 08 Jan, 2014 1 commit
    • Jaegeuk Kim's avatar
      f2fs: improve write performance under frequent fsync calls · fb5566da
      Jaegeuk Kim authored
      
      
      When considering a bunch of data writes with very frequent fsync calls, we
      are able to think the following performance regression.
      
      N: Node IO, D: Data IO, IO scheduler: cfq
      
      Issue    pending IOs
      	 D1 D2 D3 D4
       D1         D2 D3 D4 N1
       D2            D3 D4 N1 N2
       N1            D3 D4 N2 D1
       --> N1 can be selected by cfq becase of the same priority of N and D.
           Then D3 and D4 would be delayed, resuling in performance degradation.
      
      So, when processing the fsync call, it'd better give higher priority to data IOs
      than node IOs by assigning WRITE and WRITE_SYNC respectively.
      This patch improves the random wirte performance with frequent fsync calls by up
      to 10%.
      Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
      fb5566da
  25. 06 Jan, 2014 1 commit
    • Jaegeuk Kim's avatar
      f2fs: add inline_data recovery routine · 1e1bb4ba
      Jaegeuk Kim authored
      
      
      This patch adds a inline_data recovery routine with the following policy.
      
      [prev.] [next] of inline_data flag
         o       o  -> recover inline_data
         o       x  -> remove inline_data, and then recover data blocks
         x       o  -> remove inline_data, and then recover inline_data
         x       x  -> recover data blocks
      Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
      1e1bb4ba