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| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2014-10-06 17:39:50 -0700 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2014-10-06 17:39:50 -0700 |
| commit | 88b88a66797159949cec32eaab12b4968f6fae2d (patch) | |
| tree | da80cebeb9cc86d5f9f16718ce7921eef16ed30e /fs/f2fs/inline.c | |
| parent | 120c2cba1d76494a68e36a11eb630cb335ed1494 (diff) | |
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 <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/inline.c')
| -rw-r--r-- | fs/f2fs/inline.c | 3 |
1 files changed, 3 insertions, 0 deletions
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; |