1. 04 Nov, 2014 26 commits
  2. 07 Oct, 2014 2 commits
    • Jaegeuk Kim's avatar
      f2fs: support volatile operations for transient data · 02a1335f
      Jaegeuk Kim authored
      
      
      This patch adds support for volatile writes which keep data pages in memory
      until f2fs_evict_inode is called by iput.
      
      For instance, we can use this feature for the sqlite database as follows.
      While supporting atomic writes for main database file, we can keep its journal
      data temporarily in the page cache by the following sequence.
      
      1. open
       -> ioctl(F2FS_IOC_START_VOLATILE_WRITE);
      2. writes
       : keep all the data in the page cache.
      3. flush to the database file with atomic writes
        a. ioctl(F2FS_IOC_START_ATOMIC_WRITE);
        b. writes
        c. ioctl(F2FS_IOC_COMMIT_ATOMIC_WRITE);
      4. close
       -> drop the cached data
      Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
      02a1335f
    • Jaegeuk Kim's avatar
      f2fs: support atomic writes · 88b88a66
      Jaegeuk Kim authored
      This patch introduces a very limited functionality for atomic write support.
      In order to support atomic write, this patch adds two ioctls:
       o F2FS_IOC_START_ATOMIC_WRITE
       o F2FS_IOC_COMMIT_ATOMIC_WRITE
      
      The database engine should be aware of the following sequence.
      1. open
       -> ioctl(F2FS_IOC_START_ATOMIC_WRITE);
      2. writes
        : all the written data will be treated as atomic pages.
      3. commit
       -> ioctl(F2FS_IOC_COMMIT_ATOMIC_WRITE);
        : this flushes all the data blocks to the disk, which will be shown all or
        nothing by f2fs recovery procedure.
      4. repeat to #2
      
      .
      
      The IO pattens should be:
      
        ,- START_ATOMIC_WRITE                  ,- COMMIT_ATOMIC_WRITE
       CP | D D D D D D | FSYNC | D D D D | FSYNC ...
                            `- COMMIT_ATOMIC_WRITE
      Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
      88b88a66
  3. 06 Oct, 2014 1 commit
  4. 30 Sep, 2014 7 commits
  5. 23 Sep, 2014 4 commits