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authorJaegeuk Kim <jaegeuk@kernel.org>2014-10-07 00:39:50 (GMT)
committerJaegeuk Kim <jaegeuk@kernel.org>2014-10-07 00:39:50 (GMT)
commit88b88a66797159949cec32eaab12b4968f6fae2d (patch)
treeda80cebeb9cc86d5f9f16718ce7921eef16ed30e /fs/f2fs/inode.c
parent120c2cba1d76494a68e36a11eb630cb335ed1494 (diff)
downloadlinux-88b88a66797159949cec32eaab12b4968f6fae2d.tar.xz
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/inode.c')
-rw-r--r--fs/f2fs/inode.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 63923ee..1b85f72 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -269,6 +269,10 @@ void f2fs_evict_inode(struct inode *inode)
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
nid_t xnid = F2FS_I(inode)->i_xattr_nid;
+ /* some remained atomic pages should discarded */
+ if (f2fs_is_atomic_file(inode))
+ commit_inmem_pages(inode, true);
+
trace_f2fs_evict_inode(inode);
truncate_inode_pages_final(&inode->i_data);