[PATCH 03/10] btrfs: start transaction in btrfs_ioctl_setflags()

[Anand Jain <anand.jain@xxxxxxxxxx>]

Inode attribute can be set through the FS_IOC_SETFLAGS ioctl.
This flags also includes compression attribute for which we would
set/reset the compression extended attribute. While doing this there
is a bit of duplicate code, the following things happens twice-
start/end_transaction, inode_inc_iversion(), current_time update to
inode->i_ctime, and btrfs_update_inode(). These are updated both at
btrfs_ioctl_setflags() and btrfs_set_props() as well.

This patch merges these two duplicate codes at btrfs_ioctl_setflags().

Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
---
RFC->v1: call btrfs_transaction_abort() at the place of error return
 
 fs/btrfs/ioctl.c | 41 +++++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 20 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 63e6e2f5b659..fc3f75c9a210 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -192,6 +192,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
 	u64 old_flags;
 	unsigned int old_i_flags;
 	umode_t mode;
+	const char *comp = NULL;
 
 	if (!inode_owner_or_capable(inode))
 		return -EPERM;
@@ -283,14 +284,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
 	if (fsflags & FS_NOCOMP_FL) {
 		binode->flags &= ~BTRFS_INODE_COMPRESS;
 		binode->flags |= BTRFS_INODE_NOCOMPRESS;
-
-		/* set no-compression no need to validate prop here */
-		ret = btrfs_set_prop_trans(inode, "btrfs.compression", NULL,
-					   0, 0);
-		if (ret && ret != -ENODATA)
-			goto out_drop;
 	} else if (fsflags & FS_COMPR_FL) {
-		const char *comp;
 
 		if (IS_SWAPFILE(inode)) {
 			ret = -ETXTBSY;
@@ -300,36 +294,43 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
 		binode->flags |= BTRFS_INODE_COMPRESS;
 		binode->flags &= ~BTRFS_INODE_NOCOMPRESS;
 
-		/* compress_type is already validated during mount options */
 		comp = btrfs_compress_type2str(fs_info->compress_type);
 		if (!comp || comp[0] == 0)
 			comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
-
-		ret = btrfs_set_prop_trans(inode, "btrfs.compression", comp,
-					   strlen(comp), 0);
-		if (ret)
-			goto out_drop;
-
 	} else {
-		/* reset prop, no need of validate prop here */
-		ret = btrfs_set_prop_trans(inode, "btrfs.compression", NULL,
-					   0, 0);
-		if (ret && ret != -ENODATA)
-			goto out_drop;
 		binode->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
 	}
 
-	trans = btrfs_start_transaction(root, 1);
+	trans = btrfs_start_transaction(root, 3);
 	if (IS_ERR(trans)) {
 		ret = PTR_ERR(trans);
 		goto out_drop;
 	}
 
+	if (comp) {
+		ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp,
+				     strlen(comp), 0);
+		if (ret) {
+			btrfs_abort_transaction(trans, ret);
+			goto out_end_trans;
+		}
+		set_bit(BTRFS_INODE_COPY_EVERYTHING,
+			&BTRFS_I(inode)->runtime_flags);
+	} else {
+		ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL,
+				     0, 0);
+		if (ret && ret != -ENODATA) {
+			btrfs_abort_transaction(trans, ret);
+			goto out_end_trans;
+		}
+	}
+
 	btrfs_sync_inode_flags_to_i_flags(inode);
 	inode_inc_iversion(inode);
 	inode->i_ctime = current_time(inode);
 	ret = btrfs_update_inode(trans, root, inode);
 
+ out_end_trans:
 	btrfs_end_transaction(trans);
  out_drop:
 	if (ret) {
-- 
2.20.1 (Apple Git-117)