[PATCH 3/5] vfs: EXPORT_SYMBOL for fiemap_check_ranges()

[Ritesh Harjani <riteshh@linux.ibm.com>]

1. fiemap_check_ranges() is needed by ovl_fiemap() to check for ranges
before calling underlying inode's ->fiemap() call.
2. With this change even ext4 can use generic fiemap_check_ranges() instead of
having a duplicate copy of it.

So make this EXPORT_SYMBOL for use by overlayfs.

Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
---
 fs/ioctl.c         | 5 +++--
 include/linux/fs.h | 2 ++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/ioctl.c b/fs/ioctl.c
index 282d45be6f45..f1d93263186c 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -166,8 +166,8 @@ int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
 }
 EXPORT_SYMBOL(fiemap_check_flags);
 
-static int fiemap_check_ranges(struct super_block *sb,
-			       u64 start, u64 len, u64 *new_len)
+int fiemap_check_ranges(struct super_block *sb, u64 start, u64 len,
+			u64 *new_len)
 {
 	u64 maxbytes = (u64) sb->s_maxbytes;
 
@@ -187,6 +187,7 @@ static int fiemap_check_ranges(struct super_block *sb,
 
 	return 0;
 }
+EXPORT_SYMBOL(fiemap_check_ranges);
 
 static int ioctl_fiemap(struct file *filp, struct fiemap __user *ufiemap)
 {
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 4f6f59b4f22a..1ea70fe07618 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1759,6 +1759,8 @@ int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
 			    u64 phys, u64 len, u32 flags);
 int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
 
+int fiemap_check_ranges(struct super_block *sb, u64 start, u64 len,
+			u64 *new_len);
 /*
  * This is the "filldir" function type, used by readdir() to let
  * the kernel specify what kind of dirent layout it wants to have.
-- 
2.21.0