[RFC PATCH 3/6] Btrfs: add support for setting btime

Omar Sandoval
2019-02-14T10:01:03Z

From: Omar Sandoval <osandov@fb.com>

The Btrfs inode format has always included btime (under the name otime),
so setting it is trivial.

Signed-off-by: Omar Sandoval <osandov@fb.com>
---
fs/btrfs/inode.c | 2 ++
fs/btrfs/super.c | 4 ++--
2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 5c349667c761..49ad777d8057 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5153,6 +5153,8 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)

if (attr->ia_valid) {
setattr_copy(inode, attr);
+ if (attr->ia_valid & ATTR_BTIME)
+ BTRFS_I(inode)->i_otime = attr->ia_btime;
inode_inc_iversion(inode);
err = btrfs_dirty_inode(inode);

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 0a3f122dd61f..2af368cad2aa 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -2140,7 +2140,7 @@ static struct file_system_type btrfs_fs_type = {
.name = "btrfs",
.mount = btrfs_mount,
.kill_sb = btrfs_kill_super,
- .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA,
+ .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA | FS_HAS_BTIME,
};

static struct file_system_type btrfs_root_fs_type = {
@@ -2148,7 +2148,7 @@ static struct file_system_type btrfs_root_fs_type = {
.name = "btrfs",
.mount = btrfs_mount_root,
.kill_sb = btrfs_kill_super,
- .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA,
+ .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA | FS_HAS_BTIME,
};

MODULE_ALIAS_FS("btrfs");
--
2.20.1