• 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
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