From 88b88a66797159949cec32eaab12b4968f6fae2d Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim Date: Mon, 6 Oct 2014 17:39:50 -0700 Subject: f2fs: support atomic writes 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: Jaegeuk Kim --- fs/f2fs/inline.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'fs/f2fs/inline.c') diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c index 6aef11d69e33..88036fd75797 100644 --- a/fs/f2fs/inline.c +++ b/fs/f2fs/inline.c @@ -21,6 +21,9 @@ bool f2fs_may_inline(struct inode *inode) if (!test_opt(F2FS_I_SB(inode), INLINE_DATA)) return false; + if (f2fs_is_atomic_file(inode)) + return false; + nr_blocks = F2FS_I(inode)->i_xattr_nid ? 3 : 2; if (inode->i_blocks > nr_blocks) return false; -- cgit v1.2.3