btrfs: add readonly flag
setting the readonly flag prevents writes in case an error is detected
Signed-off-by: Arne Jansen <sensille@gmx.net>
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 6a50801..a31f2a9 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -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 @@
u16 csum_size;
struct list_head csum_list;
atomic_t cancel_req;
+ int readonly;
/*
* statistics
*/
@@ -329,14 +329,16 @@
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 @@
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 @@
scrub_workers_put(root);
return PTR_ERR(sdev);
}
+ sdev->readonly = readonly;
dev->scrub_device = sdev;
atomic_inc(&fs_info->scrubs_running);