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Commit 8628764e authored by Arne Jansen's avatar Arne Jansen
Browse files

btrfs: add readonly flag 



setting the readonly flag prevents writes in case an error is detected

Signed-off-by: default avatarArne Jansen <sensille@gmx.net>
parent 96e36920

fs/btrfs/ctree.h

+1 −1
Original line number Diff line number Diff line
@@ -2657,7 +2657,7 @@ void btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, 


/* scrub.c */

int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end,

		    struct btrfs_scrub_progress *progress);

		    struct btrfs_scrub_progress *progress, int readonly);

int btrfs_scrub_pause(struct btrfs_root *root);

int btrfs_scrub_pause_super(struct btrfs_root *root);

int btrfs_scrub_continue(struct btrfs_root *root);

fs/btrfs/ioctl.c

+1 −1
Original line number Diff line number Diff line
@@ -2547,7 +2547,7 @@ static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg) 
		return PTR_ERR(sa);



	ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end,

			      &sa->progress);

			      &sa->progress, sa->flags & BTRFS_SCRUB_READONLY);



	if (copy_to_user(arg, sa, sizeof(*sa)))

		ret = -EFAULT;

fs/btrfs/ioctl.h

+1 −0
Original line number Diff line number Diff line
@@ -81,6 +81,7 @@ struct btrfs_scrub_progress { 
					 * Intermittent error. */

};



#define BTRFS_SCRUB_READONLY	1

struct btrfs_ioctl_scrub_args {

	__u64 devid;				/* in */

	__u64 start;				/* in */

fs/btrfs/scrub.c

+13 −10
Original line number Diff line number Diff line
@@ -42,7 +42,6 @@ 
 *  - In case of a read error on files with nodatasum, map the file and read

 *    the extent to trigger a writeback of the good copy

 *  - track and record media errors, throw out bad devices

 *  - add a readonly mode

 *  - add a mode to also read unallocated space

 *  - make the prefetch cancellable

 */
@@ -99,6 +98,7 @@ struct scrub_dev { 
	u16			csum_size;

	struct list_head	csum_list;

	atomic_t		cancel_req;

	int			readonly;

	/*

	 * statistics

	 */
@@ -329,6 +329,7 @@ static void scrub_fixup(struct scrub_bio *sbio, int ix) 
	if (i == multi->num_stripes)

		goto uncorrectable;



	if (!sdev->readonly) {

		/*

		 * bi_io_vec[ix].bv_page now contains good data, write it back

		 */
@@ -338,6 +339,7 @@ static void scrub_fixup(struct scrub_bio *sbio, int ix) 
			/* I/O-error, writeback failed, give up */

			goto uncorrectable;

		}

	}



	kfree(multi);

	spin_lock(&sdev->stat_lock);
@@ -1156,7 +1158,7 @@ static noinline_for_stack void scrub_workers_put(struct btrfs_root *root) 




int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end,

		    struct btrfs_scrub_progress *progress)

		    struct btrfs_scrub_progress *progress, int readonly)

{

	struct scrub_dev *sdev;

	struct btrfs_fs_info *fs_info = root->fs_info;
@@ -1209,6 +1211,7 @@ int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end, 
		scrub_workers_put(root);

		return PTR_ERR(sdev);

	}

	sdev->readonly = readonly;

	dev->scrub_device = sdev;



	atomic_inc(&fs_info->scrubs_running);