Btrfs: add support for device replace ioctls (3f6bcfbd) · Commits · 戴 / test

fs/btrfs/ioctl.c

+48 −0

Original line number	Diff line number	Diff line
		@@ -55,6 +55,7 @@
		#include "backref.h"
		#include "rcu-string.h"
		#include "send.h"
		#include "dev-replace.h"

		/* Mask out flags that are inappropriate for the given type of inode. */
		static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
		@@ -3171,6 +3172,51 @@ static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
		return ret;
		}

		static long btrfs_ioctl_dev_replace(struct btrfs_root root, void __user arg)
		{
		struct btrfs_ioctl_dev_replace_args *p;
		int ret;

		if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

		p = memdup_user(arg, sizeof(*p));
		if (IS_ERR(p))
		return PTR_ERR(p);

		switch (p->cmd) {
		case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
		if (atomic_xchg(
		&root->fs_info->mutually_exclusive_operation_running,
		1)) {
		pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
		ret = -EINPROGRESS;
		} else {
		ret = btrfs_dev_replace_start(root, p);
		atomic_set(
		&root->fs_info->mutually_exclusive_operation_running,
		0);
		}
		break;
		case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
		btrfs_dev_replace_status(root->fs_info, p);
		ret = 0;
		break;
		case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
		ret = btrfs_dev_replace_cancel(root->fs_info, p);
		break;
		default:
		ret = -EINVAL;
		break;
		}

		if (copy_to_user(arg, p, sizeof(*p)))
		ret = -EFAULT;

		kfree(p);
		return ret;
		}

		static long btrfs_ioctl_ino_to_path(struct btrfs_root root, void __user arg)
		{
		int ret = 0;
		@@ -3826,6 +3872,8 @@ long btrfs_ioctl(struct file *file, unsigned int
		return btrfs_ioctl_qgroup_create(root, argp);
		case BTRFS_IOC_QGROUP_LIMIT:
		return btrfs_ioctl_qgroup_limit(root, argp);
		case BTRFS_IOC_DEV_REPLACE:
		return btrfs_ioctl_dev_replace(root, argp);
		}

		return -ENOTTY;

fs/btrfs/ioctl.h

+4 −3

Original line number	Diff line number	Diff line
		@@ -30,6 +30,8 @@ struct btrfs_ioctl_vol_args {
		char name[BTRFS_PATH_NAME_MAX + 1];
		};

		#define BTRFS_DEVICE_PATH_NAME_MAX 1024

		#define BTRFS_SUBVOL_CREATE_ASYNC (1ULL << 0)
		#define BTRFS_SUBVOL_RDONLY (1ULL << 1)
		#define BTRFS_SUBVOL_QGROUP_INHERIT (1ULL << 2)
		@@ -127,10 +129,10 @@ struct btrfs_ioctl_scrub_args {
		#define BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID 1
		struct btrfs_ioctl_dev_replace_start_params {
		__u64 srcdevid; /* in, if 0, use srcdev_name instead */
		__u8 srcdev_name[BTRFS_PATH_NAME_MAX + 1]; /* in */
		__u8 tgtdev_name[BTRFS_PATH_NAME_MAX + 1]; /* in */
		__u64 cont_reading_from_srcdev_mode; /* in, see #define
		* above */
		__u8 srcdev_name[BTRFS_DEVICE_PATH_NAME_MAX + 1]; /* in */
		__u8 tgtdev_name[BTRFS_DEVICE_PATH_NAME_MAX + 1]; /* in */
		};

		#define BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED 0
		@@ -165,7 +167,6 @@ struct btrfs_ioctl_dev_replace_args {
		__u64 spare[64];
		};

		#define BTRFS_DEVICE_PATH_NAME_MAX 1024
		struct btrfs_ioctl_dev_info_args {
		__u64 devid; /* in/out */
		__u8 uuid[BTRFS_UUID_SIZE]; /* in/out */

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