[PATCH] btrfs-progs: qgroup: Check for ENOTCONN error on create/assign/limit

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From: Marcos Paulo de Souza <mpdesouza@xxxxxxxx>

Current btrfs code returns ENOTCONN when the user tries to create a
qgroup on a subvolume without quota enabled. In order to present a
meaningful message to the user, we now handle ENOTCONN showing
the message "quota not enabled".

Signed-off-by: Marcos Paulo de Souza <mpdesouza@xxxxxxxx>
---
 This patch survived a full btrfs-progs tests run

 cmds/qgroup.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/cmds/qgroup.c b/cmds/qgroup.c
index ba81052a..6bfb4949 100644
--- a/cmds/qgroup.c
+++ b/cmds/qgroup.c
@@ -98,7 +98,9 @@ static int _cmd_qgroup_assign(const struct cmd_struct *cmd, int assign,
 
 	ret = ioctl(fd, BTRFS_IOC_QGROUP_ASSIGN, &args);
 	if (ret < 0) {
-		error("unable to assign quota group: %m");
+		error("unable to assign quota group: %s",
+				errno == ENOTCONN ? "quota not enabled"
+						: strerror(errno));
 		close_file_or_dir(fd, dirstream);
 		return 1;
 	}
@@ -152,8 +154,10 @@ static int _cmd_qgroup_create(int create, int argc, char **argv)
 	ret = ioctl(fd, BTRFS_IOC_QGROUP_CREATE, &args);
 	close_file_or_dir(fd, dirstream);
 	if (ret < 0) {
-		error("unable to %s quota group: %m",
-			create ? "create":"destroy");
+		error("unable to %s quota group: %s",
+			create ? "create":"destroy",
+				errno == ENOTCONN ? "quota not enabled"
+						: strerror(errno));
 		return 1;
 	}
 	return 0;
@@ -447,7 +451,10 @@ static int cmd_qgroup_limit(const struct cmd_struct *cmd, int argc, char **argv)
 	ret = ioctl(fd, BTRFS_IOC_QGROUP_LIMIT, &args);
 	close_file_or_dir(fd, dirstream);
 	if (ret < 0) {
-		error("unable to limit requested quota group: %m");
+		error("unable to limit requested quota group: %s",
+				errno == ENOTCONN ? "quota not enabled"
+						: strerror(errno));
+
 		return 1;
 	}
 	return 0;
-- 
2.23.0




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