[PATCH 4/4] f2fs: introduce a new ioctl F2FS_IOC_WRITE_CHECKPOINT

[Chao Yu]

This patch introduce a new ioctl for those users who want to trigger
checkpoint from userspace through ioctl.

Signed-off-by: Chao Yu <chao2...@samsung.com>
---
 fs/f2fs/f2fs.h |  1 +
 fs/f2fs/file.c | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 1b2fc23..18e5902 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -231,6 +231,7 @@ static inline bool __has_cursum_space(struct 
f2fs_summary_block *sum, int
size,
 #define F2FS_IOC_RELEASE_VOLATILE_WRITE        _IO(F2FS_IOCTL_MAGIC, 4)
 #define F2FS_IOC_ABORT_VOLATILE_WRITE  _IO(F2FS_IOCTL_MAGIC, 5)
 #define F2FS_IOC_GARBAGE_COLLECT       _IO(F2FS_IOCTL_MAGIC, 6)
+#define F2FS_IOC_WRITE_CHECKPOINT      _IO(F2FS_IOCTL_MAGIC, 7)
 
 #define F2FS_IOC_SET_ENCRYPTION_POLICY                                 \
                _IOR('f', 19, struct f2fs_encryption_policy)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index c269966..b3985a6 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1639,6 +1639,27 @@ static int f2fs_ioc_gc(struct file *filp, unsigned long 
arg)
        return f2fs_gc(sbi, sync);
 }
 
+static int f2fs_ioc_write_checkpoint(struct file *filp, unsigned long arg)
+{
+       struct inode *inode = file_inode(filp);
+       struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+       struct cp_control cpc;
+
+       if (!capable(CAP_SYS_ADMIN))
+               return -EPERM;
+
+       if (f2fs_readonly(sbi->sb))
+               return -EROFS;
+
+       cpc.reason = __get_cp_reason(sbi);
+
+       mutex_lock(&sbi->gc_mutex);
+       write_checkpoint(sbi, &cpc);
+       mutex_unlock(&sbi->gc_mutex);
+
+       return 0;
+}
+
 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
        switch (cmd) {
@@ -1670,6 +1691,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, 
unsigned long arg)
                return f2fs_ioc_get_encryption_pwsalt(filp, arg);
        case F2FS_IOC_GARBAGE_COLLECT:
                return f2fs_ioc_gc(filp, arg);
+       case F2FS_IOC_WRITE_CHECKPOINT:
+               return f2fs_ioc_write_checkpoint(filp, arg);
        default:
                return -ENOTTY;
        }
-- 
2.5.3

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