With discard flag in btrfs_device, we will only push trim request to the
devices support that.
Now we don't return EOPNOTSUPP to the caller, so we won't trigger BUG_ONs
in the walk_log_tree functions if we mount a drive without DISCARD
using -o discard, but it is still possible if we get errors from
blkdev_issue_discard.
This won't affect the return value of fstrim on the drives without DISCARD,
because we've already checked that in btrfs_ioctl_fitrim, Thanks
Signed-off-by: Li Dongyang <lidongyang@xxxxxxxxxx>
---
fs/btrfs/extent-tree.c | 24 ++++++++++++------------
fs/btrfs/volumes.c | 4 ++++
fs/btrfs/volumes.h | 1 +
3 files changed, 17 insertions(+), 12 deletions(-)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 5b9b6b6..507cf8d 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1774,7 +1774,6 @@ static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
u64 discarded_bytes = 0;
struct btrfs_multi_bio *multi = NULL;
-
/* Tell the block device(s) that the sectors can be discarded */
ret = btrfs_map_block(&root->fs_info->mapping_tree, REQ_DISCARD,
bytenr, &num_bytes, &multi, 0);
@@ -1782,25 +1781,26 @@ static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
struct btrfs_bio_stripe *stripe = multi->stripes;
int i;
-
for (i = 0; i < multi->num_stripes; i++, stripe++) {
- ret = btrfs_issue_discard(stripe->dev->bdev,
- stripe->physical,
- stripe->length);
- if (!ret)
- discarded_bytes += stripe->length;
- else if (ret != -EOPNOTSUPP)
- break;
+ if (stripe->dev->discard) {
+ ret = btrfs_issue_discard(stripe->dev->bdev,
+ stripe->physical,
+ stripe->length);
+ if (!ret)
+ discarded_bytes += stripe->length;
+ else if (ret == -EOPNOTSUPP) {
+ stripe->dev->discard = 0;
+ ret = 0;
+ } else
+ break;
+ }
}
kfree(multi);
}
- if (discarded_bytes && ret == -EOPNOTSUPP)
- ret = 0;
if (actual_bytes)
*actual_bytes = discarded_bytes;
-
return ret;
}
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index da541df..bdf5604 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -341,6 +341,7 @@ static noinline int device_list_add(const char *path,
device->work.func = pending_bios_fn;
memcpy(device->uuid, disk_super->dev_item.uuid,
BTRFS_UUID_SIZE);
+ device->discard = 1;
spin_lock_init(&device->io_lock);
device->name = kstrdup(path, GFP_NOFS);
if (!device->name) {
@@ -408,6 +409,7 @@ static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig)
device->devid = orig_dev->devid;
device->work.func = pending_bios_fn;
memcpy(device->uuid, orig_dev->uuid, sizeof(device->uuid));
+ device->discard = 1;
spin_lock_init(&device->io_lock);
INIT_LIST_HEAD(&device->dev_list);
INIT_LIST_HEAD(&device->dev_alloc_list);
@@ -1616,6 +1618,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
lock_chunks(root);
device->writeable = 1;
+ device->discard = 1;
device->work.func = pending_bios_fn;
generate_random_uuid(device->uuid);
spin_lock_init(&device->io_lock);
@@ -3346,6 +3349,7 @@ static struct btrfs_device *add_missing_dev(struct btrfs_root *root,
return NULL;
list_add(&device->dev_list,
&fs_devices->devices);
+ device->discard = 1;
device->dev_root = root->fs_info->dev_root;
device->devid = devid;
device->work.func = pending_bios_fn;
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 7c12d61..9f7e56c 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -45,6 +45,7 @@ struct btrfs_device {
int running_pending;
u64 generation;
+ int discard;
int writeable;
int in_fs_metadata;
int missing;
--
1.7.5.4
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