[PATCH 1/3] btrfs: rst: remove encoding field from stripe_extent

Johannes Thumshirn
2024-06-10T08:40:34Z

From: Johannes Thumshirn <johannes.thumshirn@wdc.com>

Remove the encoding field from 'struct btrfs_stripe_extent'. It was
originally intended to encode the RAID type as well as if we're a data
or a parity stripe.

But the RAID type can be inferred form the block-group and the data vs.
parity differentiation can be done easier with adding a new key type
for parity stripes in the RAID stripe tree.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
fs/btrfs/accessors.h | 3 ---
fs/btrfs/print-tree.c | 5 -----
fs/btrfs/raid-stripe-tree.c | 13 -------------
fs/btrfs/raid-stripe-tree.h | 3 +--
fs/btrfs/tree-checker.c | 19 -------------------
include/uapi/linux/btrfs_tree.h | 14 +-------------
6 files changed, 2 insertions(+), 55 deletions(-)

diff --git a/fs/btrfs/accessors.h b/fs/btrfs/accessors.h
index 6c3deaa3e878..b2eb9cde2c5d 100644
--- a/fs/btrfs/accessors.h
+++ b/fs/btrfs/accessors.h
@@ -315,11 +315,8 @@ BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);

-BTRFS_SETGET_FUNCS(stripe_extent_encoding, struct btrfs_stripe_extent, encoding, 8);
BTRFS_SETGET_FUNCS(raid_stride_devid, struct btrfs_raid_stride, devid, 64);
BTRFS_SETGET_FUNCS(raid_stride_physical, struct btrfs_raid_stride, physical, 64);
-BTRFS_SETGET_STACK_FUNCS(stack_stripe_extent_encoding,
- struct btrfs_stripe_extent, encoding, 8);
BTRFS_SETGET_STACK_FUNCS(stack_raid_stride_devid, struct btrfs_raid_stride, devid, 64);
BTRFS_SETGET_STACK_FUNCS(stack_raid_stride_physical, struct btrfs_raid_stride, physical, 64);

diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index 7e46aa8a0444..9f1e5e11bf71 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -208,11 +208,6 @@ static void print_raid_stripe_key(const struct extent_buffer *eb, u32 item_size,
struct btrfs_stripe_extent *stripe)
{
const int num_stripes = btrfs_num_raid_stripes(item_size);
- const u8 encoding = btrfs_stripe_extent_encoding(eb, stripe);
-
- pr_info("\t\t\tencoding: %s\n",
- (encoding && encoding < BTRFS_NR_RAID_TYPES) ?
- btrfs_raid_array[encoding].raid_name : "unknown");

for (int i = 0; i < num_stripes; i++)
pr_info("\t\t\tstride %d devid %llu physical %llu\n",
diff --git a/fs/btrfs/raid-stripe-tree.c b/fs/btrfs/raid-stripe-tree.c
index 6af6b4b9a32e..e6f7a234b8f6 100644
--- a/fs/btrfs/raid-stripe-tree.c
+++ b/fs/btrfs/raid-stripe-tree.c
@@ -80,7 +80,6 @@ static int btrfs_insert_one_raid_extent(struct btrfs_trans_handle *trans,
struct btrfs_key stripe_key;
struct btrfs_root *stripe_root = fs_info->stripe_root;
const int num_stripes = btrfs_bg_type_to_factor(bioc->map_type);
- u8 encoding = btrfs_bg_flags_to_raid_index(bioc->map_type);
struct btrfs_stripe_extent *stripe_extent;
const size_t item_size = struct_size(stripe_extent, strides, num_stripes);
int ret;
@@ -94,7 +93,6 @@ static int btrfs_insert_one_raid_extent(struct btrfs_trans_handle *trans,

trace_btrfs_insert_one_raid_extent(fs_info, bioc->logical, bioc->size,
num_stripes);
- btrfs_set_stack_stripe_extent_encoding(stripe_extent, encoding);
for (int i = 0; i < num_stripes; i++) {
u64 devid = bioc->stripes[i].dev->devid;
u64 physical = bioc->stripes[i].physical;
@@ -159,7 +157,6 @@ int btrfs_get_raid_extent_offset(struct btrfs_fs_info *fs_info,
struct extent_buffer *leaf;
const u64 end = logical + *length;
int num_stripes;
- u8 encoding;
u64 offset;
u64 found_logical;
u64 found_length;
@@ -222,16 +219,6 @@ int btrfs_get_raid_extent_offset(struct btrfs_fs_info *fs_info,

num_stripes = btrfs_num_raid_stripes(btrfs_item_size(leaf, slot));
stripe_extent = btrfs_item_ptr(leaf, slot, struct btrfs_stripe_extent);
- encoding = btrfs_stripe_extent_encoding(leaf, stripe_extent);
-
- if (encoding != btrfs_bg_flags_to_raid_index(map_type)) {
- ret = -EUCLEAN;
- btrfs_handle_fs_error(fs_info, ret,
- "on-disk stripe encoding %d doesn't match RAID index %d",
- encoding,
- btrfs_bg_flags_to_raid_index(map_type));
- goto out;
- }

for (int i = 0; i < num_stripes; i++) {
struct btrfs_raid_stride *stride = &stripe_extent->strides[i];
diff --git a/fs/btrfs/raid-stripe-tree.h b/fs/btrfs/raid-stripe-tree.h
index c9c258f84903..1ac1c21aac2f 100644
--- a/fs/btrfs/raid-stripe-tree.h
+++ b/fs/btrfs/raid-stripe-tree.h
@@ -48,8 +48,7 @@ static inline bool btrfs_need_stripe_tree_update(struct btrfs_fs_info *fs_info,

static inline int btrfs_num_raid_stripes(u32 item_size)
{
- return (item_size - offsetof(struct btrfs_stripe_extent, strides)) /
- sizeof(struct btrfs_raid_stride);
+ return item_size / sizeof(struct btrfs_raid_stride);
}

#endif
diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
index a2c3651a3d8f..1e140f6dabc6 100644
--- a/fs/btrfs/tree-checker.c
+++ b/fs/btrfs/tree-checker.c
@@ -1682,9 +1682,6 @@ static int check_inode_ref(struct extent_buffer *leaf,
static int check_raid_stripe_extent(const struct extent_buffer *leaf,
const struct btrfs_key *key, int slot)
{
- struct btrfs_stripe_extent *stripe_extent =
- btrfs_item_ptr(leaf, slot, struct btrfs_stripe_extent);
-
if (unlikely(!IS_ALIGNED(key->objectid, leaf->fs_info->sectorsize))) {
generic_err(leaf, slot,
"invalid key objectid for raid stripe extent, have %llu expect aligned to %u",
@@ -1698,22 +1695,6 @@ static int check_raid_stripe_extent(const struct extent_buffer *leaf,
return -EUCLEAN;
}

- switch (btrfs_stripe_extent_encoding(leaf, stripe_extent)) {
- case BTRFS_STRIPE_RAID0:
- case BTRFS_STRIPE_RAID1:
- case BTRFS_STRIPE_DUP:
- case BTRFS_STRIPE_RAID10:
- case BTRFS_STRIPE_RAID5:
- case BTRFS_STRIPE_RAID6:
- case BTRFS_STRIPE_RAID1C3:
- case BTRFS_STRIPE_RAID1C4:
- break;
- default:
- generic_err(leaf, slot, "invalid raid stripe encoding %u",
- btrfs_stripe_extent_encoding(leaf, stripe_extent));
- return -EUCLEAN;
- }
-
return 0;
}

diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h
index d24e8e121507..cb103c76d398 100644
--- a/include/uapi/linux/btrfs_tree.h
+++ b/include/uapi/linux/btrfs_tree.h
@@ -747,21 +747,9 @@ struct btrfs_raid_stride {
__le64 physical;
} __attribute__ ((__packed__));

-/* The stripe_extent::encoding, 1:1 mapping of enum btrfs_raid_types. */
-#define BTRFS_STRIPE_RAID0 1
-#define BTRFS_STRIPE_RAID1 2
-#define BTRFS_STRIPE_DUP 3
-#define BTRFS_STRIPE_RAID10 4
-#define BTRFS_STRIPE_RAID5 5
-#define BTRFS_STRIPE_RAID6 6
-#define BTRFS_STRIPE_RAID1C3 7
-#define BTRFS_STRIPE_RAID1C4 8
-
struct btrfs_stripe_extent {
- __u8 encoding;
- __u8 reserved[7];
/* An array of raid strides this stripe is composed of. */
- struct btrfs_raid_stride strides[];
+ __DECLARE_FLEX_ARRAY(struct btrfs_raid_stride, strides);
} __attribute__ ((__packed__));

#define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)

--
2.43.0