Merge tag 'arc-v3.10-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git...

[firefly-linux-kernel-4.4.55.git] / include / linux / fs.h

diff --git a/include/linux/fs.h b/include/linux/fs.h
index e8cd6b8396753901227a34659cedca367beb0926..43db02e9c9fa11bed1b058fba9dd9039ea9c226d 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2091,7 +2091,7 @@ extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
                                               void *holder);
 extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode,
                                              void *holder);
-extern int blkdev_put(struct block_device *bdev, fmode_t mode);
+extern void blkdev_put(struct block_device *bdev, fmode_t mode);
 #ifdef CONFIG_SYSFS
 extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
 extern void bd_unlink_disk_holder(struct block_device *bdev,
@@ -2227,6 +2227,13 @@ static inline void file_start_write(struct file *file)
        __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true);
 }
 
+static inline bool file_start_write_trylock(struct file *file)
+{
+       if (!S_ISREG(file_inode(file)->i_mode))
+               return true;
+       return __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, false);
+}
+
 static inline void file_end_write(struct file *file)
 {
        if (!S_ISREG(file_inode(file)->i_mode))