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Date: Thu, 8 Jan 2015 17:40:06 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Dave Chinner <david@...morbit.com>
Cc: linux-fsdevel@...r.kernel.org, Eric Sandeen <sandeen@...deen.net>,
linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 2/6 v2] f2fs: support goingdown for fs shutdown
Change log from v1:
o introduce FS_IOC_GOINGDOWN ioctl
o introduce three options: FS_GOING_DOWN_FULLSYNC, FS_GOING_DOWN_METASYNC,
and FS_GOING_DOWN_NOSYNC
This patch add an ioctl to shutdown f2fs, which stops all the further block
writes after this point.
The ioctl, FS_IOC_GOINGDOWN, provides the following three options.
1. FS_GOING_DOWN_FULLSYNC
: this will flush all the data and dentry blocks, and do checkpoint before
shutdown.
2. FS_GOING_DOWN_METASYNC
: this will do checkpoint before shutdown.
3. FS_GOING_DOWN_NOSYNC
: this will trigger shutdown as is.
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
fs/f2fs/file.c | 37 +++++++++++++++++++++++++++++++++++++
include/uapi/linux/fs.h | 8 ++++++++
2 files changed, 45 insertions(+)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 5df3367..474fb91 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1020,6 +1020,41 @@ static int f2fs_ioc_abort_volatile_write(struct file *filp)
return ret;
}
+static int f2fs_ioc_goingdown(struct file *filp, unsigned long arg)
+{
+ struct inode *inode = file_inode(filp);
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+ struct super_block *sb = sbi->sb;
+ __u32 in;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (get_user(in, (__u32 __user *)arg))
+ return -EFAULT;
+
+ switch (in) {
+ case FS_GOING_DOWN_FULLSYNC:
+ sb = freeze_bdev(sb->s_bdev);
+ if (sb && !IS_ERR(sb)) {
+ f2fs_stop_checkpoint(sbi);
+ thaw_bdev(sb->s_bdev, sb);
+ }
+ break;
+ case FS_GOING_DOWN_METASYNC:
+ /* do checkpoint only */
+ f2fs_sync_fs(sb, 1);
+ f2fs_stop_checkpoint(sbi);
+ break;
+ case FS_GOING_DOWN_NOSYNC:
+ f2fs_stop_checkpoint(sbi);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
static int f2fs_ioc_fitrim(struct file *filp, unsigned long arg)
{
struct inode *inode = file_inode(filp);
@@ -1067,6 +1102,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return f2fs_ioc_release_volatile_write(filp);
case F2FS_IOC_ABORT_VOLATILE_WRITE:
return f2fs_ioc_abort_volatile_write(filp);
+ case FS_IOC_GOINGDOWN:
+ return f2fs_ioc_goingdown(filp, arg);
case FITRIM:
return f2fs_ioc_fitrim(filp, arg);
default:
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 3735fa0..f37c699 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -157,6 +157,7 @@ struct inodes_stat_t {
#define FIFREEZE _IOWR('X', 119, int) /* Freeze */
#define FITHAW _IOWR('X', 120, int) /* Thaw */
#define FITRIM _IOWR('X', 121, struct fstrim_range) /* Trim */
+#define FS_IOC_GOINGDOWN _IOR('X', 125, __u32) /* shutdown */
#define FS_IOC_GETFLAGS _IOR('f', 1, long)
#define FS_IOC_SETFLAGS _IOW('f', 2, long)
@@ -205,4 +206,11 @@ struct inodes_stat_t {
#define SYNC_FILE_RANGE_WRITE 2
#define SYNC_FILE_RANGE_WAIT_AFTER 4
+/*
+ * Flags for going down operation used by FS_IOC_GOINGDOWN
+ */
+#define FS_GOING_DOWN_FULLSYNC 0x0 /* going down with full sync */
+#define FS_GOING_DOWN_METASYNC 0x1 /* going down with metadata */
+#define FS_GOING_DOWN_NOSYNC 0x2 /* going down */
+
#endif /* _UAPI_LINUX_FS_H */
--
2.1.1
--
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