|
@@ -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
|
|
|
*/
|
|
@@ -329,14 +329,16 @@ static void scrub_fixup(struct scrub_bio *sbio, int ix)
|
|
|
if (i == multi->num_stripes)
|
|
|
goto uncorrectable;
|
|
|
|
|
|
- /*
|
|
|
- * bi_io_vec[ix].bv_page now contains good data, write it back
|
|
|
- */
|
|
|
- if (scrub_fixup_io(WRITE, sdev->dev->bdev,
|
|
|
- (sbio->physical + ix * PAGE_SIZE) >> 9,
|
|
|
- sbio->bio->bi_io_vec[ix].bv_page)) {
|
|
|
- /* I/O-error, writeback failed, give up */
|
|
|
- goto uncorrectable;
|
|
|
+ if (!sdev->readonly) {
|
|
|
+ /*
|
|
|
+ * bi_io_vec[ix].bv_page now contains good data, write it back
|
|
|
+ */
|
|
|
+ if (scrub_fixup_io(WRITE, sdev->dev->bdev,
|
|
|
+ (sbio->physical + ix * PAGE_SIZE) >> 9,
|
|
|
+ sbio->bio->bi_io_vec[ix].bv_page)) {
|
|
|
+ /* I/O-error, writeback failed, give up */
|
|
|
+ goto uncorrectable;
|
|
|
+ }
|
|
|
}
|
|
|
|
|
|
kfree(multi);
|
|
@@ -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);
|