Btrfs: implement FS_IOC_GETFLAGS/SETFLAGS/GETVERSION

Add support for the standard attributes set via chattr and read via
lsattr.  Currently we store the attributes in the flags value in
the btrfs inode, but I wonder whether we should split it into two so
that we don't have to keep converting between the two formats.

Remove the btrfs_clear_flag/btrfs_set_flag/btrfs_test_flag macros
as they were confusing the existing code and got in the way of the
new additions.

Also add the FS_IOC_GETVERSION ioctl for getting i_generation as it's
trivial.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 10 insertions, 6 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 5fa7d7d287a4..4d6e0b6f21ea 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1115,12 +1115,14 @@ struct btrfs_root {
 #define BTRFS_INODE_READONLY            (1 << 2)
 #define BTRFS_INODE_NOCOMPRESS          (1 << 3)
 #define BTRFS_INODE_PREALLOC            (1 << 4)
-#define btrfs_clear_flag(inode, flag)   (BTRFS_I(inode)->flags &= \
-                                         ~BTRFS_INODE_##flag)
-#define btrfs_set_flag(inode, flag)     (BTRFS_I(inode)->flags |= \
-                                         BTRFS_INODE_##flag)
-#define btrfs_test_flag(inode, flag)    (BTRFS_I(inode)->flags & \
-                                         BTRFS_INODE_##flag)
+#define BTRFS_INODE_SYNC                (1 << 5)
+#define BTRFS_INODE_IMMUTABLE           (1 << 6)
+#define BTRFS_INODE_APPEND              (1 << 7)
+#define BTRFS_INODE_NODUMP              (1 << 8)
+#define BTRFS_INODE_NOATIME             (1 << 9)
+#define BTRFS_INODE_DIRSYNC             (1 << 10)
+
+
 /* some macros to generate set/get funcs for the struct fields.  This
  * assumes there is a lefoo_to_cpu for every type, so lets make a simple
  * one for u8:
@@ -2260,6 +2262,8 @@ int btrfs_cont_expand(struct inode *inode, loff_t size);
 
 /* ioctl.c */
 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
+void btrfs_update_iflags(struct inode *inode);
+void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
 
 /* file.c */
 int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync);