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authorJaegeuk Kim <jaegeuk@kernel.org>2014-10-06 17:39:50 -0700
committerJaegeuk Kim <jaegeuk@kernel.org>2014-10-06 17:39:50 -0700
commit88b88a66797159949cec32eaab12b4968f6fae2d (patch)
treeda80cebeb9cc86d5f9f16718ce7921eef16ed30e /fs/f2fs/segment.h
parent120c2cba1d76494a68e36a11eb630cb335ed1494 (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/segment.h')
-rw-r--r--fs/f2fs/segment.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index afb73627a8ec..2495bec1c621 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -175,6 +175,11 @@ struct segment_allocation {
void (*allocate_segment)(struct f2fs_sb_info *, int, bool);
};
+struct inmem_pages {
+ struct list_head list;
+ struct page *page;
+};
+
struct sit_info {
const struct segment_allocation *s_ops;
@@ -504,7 +509,7 @@ static inline bool need_inplace_update(struct inode *inode)
unsigned int policy = SM_I(sbi)->ipu_policy;
/* IPU can be done only for the user data */
- if (S_ISDIR(inode->i_mode))
+ if (S_ISDIR(inode->i_mode) || f2fs_is_atomic_file(inode))
return false;
if (policy & (0x1 << F2FS_IPU_FORCE))