4 files changed, 25 insertions, 2 deletions

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 8bbd60633f37..8e58c4cc2cb9 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1052,7 +1052,7 @@ static int f2fs_write_end(struct file *file,
 
         trace_f2fs_write_end(inode, pos, len, copied);
 
-        if (f2fs_is_atomic_file(inode))
+        if (f2fs_is_atomic_file(inode) || f2fs_is_volatile_file(inode))
                 register_inmem_page(inode, page);
         else
                 set_page_dirty(page);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 07fda632430b..8171e80b2ee9 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -198,6 +198,7 @@ static inline bool __has_cursum_space(struct f2fs_summary_block *sum, int size,
 #define F2FS_IOCTL_MAGIC                0xf5
 #define F2FS_IOC_START_ATOMIC_WRITE     _IO(F2FS_IOCTL_MAGIC, 1)
 #define F2FS_IOC_COMMIT_ATOMIC_WRITE    _IO(F2FS_IOCTL_MAGIC, 2)
+#define F2FS_IOC_START_VOLATILE_WRITE   _IO(F2FS_IOCTL_MAGIC, 3)
 
 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 /*
@@ -1060,6 +1061,7 @@ enum {
         FI_UPDATE_WRITE,        /* inode has in-place-update data */
         FI_NEED_IPU,            /* used for ipu per file */
         FI_ATOMIC_FILE,         /* indicate atomic file */
+        FI_VOLATILE_FILE,       /* indicate volatile file */
 };
 
 static inline void set_inode_flag(struct f2fs_inode_info *fi, int flag)
@@ -1151,6 +1153,11 @@ static inline bool f2fs_is_atomic_file(struct inode *inode)
         return is_inode_flag_set(F2FS_I(inode), FI_ATOMIC_FILE);
 }
 
+static inline bool f2fs_is_volatile_file(struct inode *inode)
+{
+        return is_inode_flag_set(F2FS_I(inode), FI_VOLATILE_FILE);
+}
+
 static inline void *inline_data_addr(struct page *page)
 {
         struct f2fs_inode *ri = F2FS_INODE(page);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 3708b80125d0..8e68bb64f835 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -885,6 +885,9 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp)
         if (!inode_owner_or_capable(inode))
                 return -EACCES;
 
+        if (f2fs_is_volatile_file(inode))
+                return 0;
+
         ret = mnt_want_write_file(filp);
         if (ret)
                 return ret;
@@ -897,6 +900,17 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp)
         return ret;
 }
 
+static int f2fs_ioc_start_volatile_write(struct file *filp)
+{
+        struct inode *inode = file_inode(filp);
+
+        if (!inode_owner_or_capable(inode))
+                return -EACCES;
+
+        set_inode_flag(F2FS_I(inode), FI_VOLATILE_FILE);
+        return 0;
+}
+
 static int f2fs_ioc_fitrim(struct file *filp, unsigned long arg)
 {
         struct inode *inode = file_inode(filp);
@@ -938,6 +952,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
                 return f2fs_ioc_start_atomic_write(filp);
         case F2FS_IOC_COMMIT_ATOMIC_WRITE:
                 return f2fs_ioc_commit_atomic_write(filp);
+        case F2FS_IOC_START_VOLATILE_WRITE:
+                return f2fs_ioc_start_volatile_write(filp);
         case FITRIM:
                 return f2fs_ioc_fitrim(filp, arg);
         default:
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 1b85f72d0071..0deead4505e7 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -270,7 +270,7 @@ void f2fs_evict_inode(struct inode *inode)
         nid_t xnid = F2FS_I(inode)->i_xattr_nid;
 
         /* some remained atomic pages should discarded */
-        if (f2fs_is_atomic_file(inode))
+        if (f2fs_is_atomic_file(inode) || f2fs_is_volatile_file(inode))
                 commit_inmem_pages(inode, true);
 
         trace_f2fs_evict_inode(inode);