* [PATCH] f2fs: fix race in between GC and atomic open
@ 2018-04-17 9:51 ` Chao Yu
0 siblings, 0 replies; 2+ messages in thread
From: Chao Yu @ 2018-04-17 9:51 UTC (permalink / raw)
To: jaegeuk; +Cc: linux-f2fs-devel, linux-kernel, chao, Chao Yu
Thread GC thread
- f2fs_ioc_start_atomic_write
- get_dirty_pages
- filemap_write_and_wait_range
- f2fs_gc
- do_garbage_collect
- gc_data_segment
- move_data_page
- f2fs_is_atomic_file
- set_page_dirty
- set_inode_flag(, FI_ATOMIC_FILE)
Dirty data page can still be generated by GC in race condition as
above call stack.
This patch adds fi->dio_rwsem[WRITE] in f2fs_ioc_start_atomic_write
to avoid such race.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
fs/f2fs/file.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 9ac837bb0efb..1612e763a69c 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1703,6 +1703,8 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
inode_lock(inode);
+ down_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
+
if (f2fs_is_atomic_file(inode))
goto out;
@@ -1728,6 +1730,7 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
stat_inc_atomic_write(inode);
stat_update_max_atomic_write(inode);
out:
+ up_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
inode_unlock(inode);
mnt_drop_write_file(filp);
return ret;
--
2.15.0.55.gc2ece9dc4de6
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH] f2fs: fix race in between GC and atomic open
@ 2018-04-17 9:51 ` Chao Yu
0 siblings, 0 replies; 2+ messages in thread
From: Chao Yu @ 2018-04-17 9:51 UTC (permalink / raw)
To: jaegeuk; +Cc: linux-f2fs-devel, linux-kernel, chao, Chao Yu
Thread GC thread
- f2fs_ioc_start_atomic_write
- get_dirty_pages
- filemap_write_and_wait_range
- f2fs_gc
- do_garbage_collect
- gc_data_segment
- move_data_page
- f2fs_is_atomic_file
- set_page_dirty
- set_inode_flag(, FI_ATOMIC_FILE)
Dirty data page can still be generated by GC in race condition as
above call stack.
This patch adds fi->dio_rwsem[WRITE] in f2fs_ioc_start_atomic_write
to avoid such race.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
fs/f2fs/file.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 9ac837bb0efb..1612e763a69c 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1703,6 +1703,8 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
inode_lock(inode);
+ down_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
+
if (f2fs_is_atomic_file(inode))
goto out;
@@ -1728,6 +1730,7 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
stat_inc_atomic_write(inode);
stat_update_max_atomic_write(inode);
out:
+ up_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
inode_unlock(inode);
mnt_drop_write_file(filp);
return ret;
--
2.15.0.55.gc2ece9dc4de6
^ permalink raw reply related [flat|nested] 2+ messages in thread
end of thread, other threads:[~2018-04-17 9:52 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
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2018-04-17 9:51 [PATCH] f2fs: fix race in between GC and atomic open Chao Yu
2018-04-17 9:51 ` Chao Yu
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