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btrfs: add readonly flag

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

Signed-off-by: Arne Jansen <sensille@gmx.net>
This commit is contained in:
Arne Jansen
2011-03-23 16:34:19 +01:00
parent 96e369208e
commit 8628764e1a
4 changed files with 16 additions and 12 deletions
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23
fs/btrfs/scrub.c
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@@ -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);