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, 3 insertions, 3 deletions

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index ab07627084f1..de1e2fd32080 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -123,7 +123,7 @@ static int check_compressed_csum(struct inode *inode,
         u32 csum;
         u32 *cb_sum = &cb->sums;
 
-        if (btrfs_test_flag(inode, NODATASUM))
+        if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)
                 return 0;
 
         for (i = 0; i < cb->nr_pages; i++) {
@@ -670,7 +670,7 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
                          */
                         atomic_inc(&cb->pending_bios);
 
-                        if (!btrfs_test_flag(inode, NODATASUM)) {
+                        if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) {
                                 btrfs_lookup_bio_sums(root, inode, comp_bio,
                                                       sums);
                         }
@@ -697,7 +697,7 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
         ret = btrfs_bio_wq_end_io(root->fs_info, comp_bio, 0);
         BUG_ON(ret);
 
-        if (!btrfs_test_flag(inode, NODATASUM))
+        if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
                 btrfs_lookup_bio_sums(root, inode, comp_bio, sums);
 
         ret = btrfs_map_bio(root, READ, comp_bio, mirror_num, 0);