This patch provides an ioctl to check if the FS is performing
any device exclusive operations like device add remove balance
etc. Basically any operation which will set
fs_info->mutually_exclusive_operation_running to true
This will be necessary for any user cli which has to know
the state before putting long running commands to background.
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
---
fs/btrfs/ioctl.c | 10 ++++++++++
include/uapi/linux/btrfs.h | 1 +
2 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 89f346c..3544a90 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4420,6 +4420,14 @@ out_unlock:
return ret;
}
+static int btrfs_ioctl_check_dev_excl_op(struct btrfs_root *root,
+ void __user *arg)
+{
+ if (atomic_read(&root->fs_info->mutually_exclusive_operation_running))
+ return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
+ return 0;
+}
+
long btrfs_ioctl(struct file *file, unsigned int
cmd, unsigned long arg)
{
@@ -4532,6 +4540,8 @@ long btrfs_ioctl(struct file *file, unsigned int
return btrfs_ioctl_set_fslabel(file, argp);
case BTRFS_IOC_FILE_EXTENT_SAME:
return btrfs_ioctl_file_extent_same(file, argp);
+ case BTRFS_IOC_CHECK_DEV_EXCL_OPS:
+ return btrfs_ioctl_check_dev_excl_op(root, NULL);
}
return -ENOTTY;
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index 90d7bd9..a4fa6eb 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -606,5 +606,6 @@ static inline char *btrfs_err_str(enum btrfs_err_code err_code)
struct btrfs_ioctl_dev_replace_args)
#define BTRFS_IOC_FILE_EXTENT_SAME _IOWR(BTRFS_IOCTL_MAGIC, 54, \
struct btrfs_ioctl_same_args)
+#define BTRFS_IOC_CHECK_DEV_EXCL_OPS _IO(BTRFS_IOCTL_MAGIC, 56)
#endif /* _UAPI_LINUX_BTRFS_H */
--
1.7.1
--
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