[PATCH 3/4] btrfs-progs: Check for exclusive operation before issuing ioctl

[Goldwyn Rodrigues <rgoldwyn@suse.de>]

From: Goldwyn Rodrigues <rgoldwyn@suse.com>

Check if an exclusive operation is running and if it is, err with the
name of the exclusive operation running.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
---
 cmds/device.c     | 14 ++++++++++++++
 cmds/filesystem.c |  7 +++++++
 2 files changed, 21 insertions(+)

diff --git a/cmds/device.c b/cmds/device.c
index 99ceed93..6acd4ae6 100644
--- a/cmds/device.c
+++ b/cmds/device.c
@@ -61,6 +61,7 @@ static int cmd_device_add(const struct cmd_struct *cmd,
 	int discard = 1;
 	int force = 0;
 	int last_dev;
+	char exop[BTRFS_SYSFS_EXOP_SIZE];
 
 	optind = 0;
 	while (1) {
@@ -96,6 +97,12 @@ static int cmd_device_add(const struct cmd_struct *cmd,
 	if (fdmnt < 0)
 		return 1;
 
+	if (get_exclusive_operation(fdmnt, exop) > 0 && strcmp(exop, "none")) {
+		error("unable to add device: %s in progress", exop);
+		close_file_or_dir(fdmnt, dirstream);
+		return 1;
+	}
+
 	for (i = optind; i < last_dev; i++){
 		struct btrfs_ioctl_vol_args ioctl_args;
 		int	devfd, res;
@@ -155,6 +162,7 @@ static int _cmd_device_remove(const struct cmd_struct *cmd,
 	char	*mntpnt;
 	int i, fdmnt, ret = 0;
 	DIR	*dirstream = NULL;
+	char exop[BTRFS_SYSFS_EXOP_SIZE];
 
 	clean_args_no_options(cmd, argc, argv);
 
@@ -167,6 +175,12 @@ static int _cmd_device_remove(const struct cmd_struct *cmd,
 	if (fdmnt < 0)
 		return 1;
 
+	if (get_exclusive_operation(fdmnt, exop) > 0 && strcmp(exop, "none")) {
+		error("unable to remove device: %s in progress", exop);
+		close_file_or_dir(fdmnt, dirstream);
+		return 1;
+	}
+
 	for(i = optind; i < argc - 1; i++) {
 		struct	btrfs_ioctl_vol_args arg;
 		struct btrfs_ioctl_vol_args_v2 argv2 = {0};
diff --git a/cmds/filesystem.c b/cmds/filesystem.c
index 6c1b6908..c3efb405 100644
--- a/cmds/filesystem.c
+++ b/cmds/filesystem.c
@@ -1079,6 +1079,7 @@ static int cmd_filesystem_resize(const struct cmd_struct *cmd,
 	char	*amount, *path;
 	DIR	*dirstream = NULL;
 	struct stat st;
+	char exop[BTRFS_SYSFS_EXOP_SIZE];
 
 	clean_args_no_options_relaxed(cmd, argc, argv);
 
@@ -1110,6 +1111,12 @@ static int cmd_filesystem_resize(const struct cmd_struct *cmd,
 	if (fd < 0)
 		return 1;
 
+	if (get_exclusive_operation(fd, exop) > 0 && strcmp(exop, "none")) {
+		error("unable to resize: %s in progress", exop);
+		close_file_or_dir(fd, dirstream);
+		return 1;
+	}
+
 	printf("Resize '%s' of '%s'\n", path, amount);
 	memset(&args, 0, sizeof(args));
 	strncpy_null(args.name, amount);
-- 
2.26.2