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f2fs: support volatile operations for transient data

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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: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
2014-10-06 16:11:16 -07:00
parent 88b88a6679
commit 02a1335f25
4 changed files with 25 additions and 2 deletions
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2
fs/f2fs/data.c
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@@ -1052,7 +1052,7 @@ static int f2fs_write_end(struct file *file,
trace_f2fs_write_end(inode, pos, len, copied);
if (f2fs_is_atomic_file(inode))
if (f2fs_is_atomic_file(inode) || f2fs_is_volatile_file(inode))
register_inmem_page(inode, page);
else
set_page_dirty(page);