Re: [PATCH 1/7] btrfs: use btrfs_item_size_nr/btrfs_item_offset_nr everywhere
From: Qu Wenruo <hidden>
Date: 2021-10-21 23:27:04
On 2021/10/22 02:58, Josef Bacik wrote:
We have this pattern in a lot of places item = btrfs_item_nr(slot); btrfs_item_size(leaf, item); when we could simply use btrfs_item_size(leaf, slot); Fix all callers of btrfs_item_size() and btrfs_item_offset() to use the _nr variation of the helpers. Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Yeah, for such simple structure (only key + offset + size), there is really no need to use item potiner. Reviewed-by: Qu Wenruo <redacted> Thanks, Qu
quoted hunk ↗ jump to hunk
--- fs/btrfs/backref.c | 4 +--- fs/btrfs/ctree.c | 22 +++++++--------------- fs/btrfs/dir-item.c | 6 ++---- fs/btrfs/inode-item.c | 4 +--- fs/btrfs/print-tree.c | 4 +--- fs/btrfs/send.c | 8 ++------ fs/btrfs/tests/extent-buffer-tests.c | 17 +++++------------ fs/btrfs/xattr.c | 4 +--- 8 files changed, 20 insertions(+), 49 deletions(-)diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index f735b8798ba1..8066b524916c 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c@@ -2058,7 +2058,6 @@ static int iterate_inode_refs(u64 inum, struct btrfs_root *fs_root, u64 parent = 0; int found = 0; struct extent_buffer *eb; - struct btrfs_item *item; struct btrfs_inode_ref *iref; struct btrfs_key found_key;@@ -2084,10 +2083,9 @@ static int iterate_inode_refs(u64 inum, struct btrfs_root *fs_root, } btrfs_release_path(path); - item = btrfs_item_nr(slot); iref = btrfs_item_ptr(eb, slot, struct btrfs_inode_ref); - for (cur = 0; cur < btrfs_item_size(eb, item); cur += len) { + for (cur = 0; cur < btrfs_item_size_nr(eb, slot); cur += len) { name_len = btrfs_inode_ref_name_len(eb, iref); /* path must be released before calling iterate()! */ btrfs_debug(fs_root->fs_info,diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 74c8e18f3720..ec8b1266fd92 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c@@ -2614,19 +2614,15 @@ static noinline int split_node(struct btrfs_trans_handle *trans, */ static int leaf_space_used(struct extent_buffer *l, int start, int nr) { - struct btrfs_item *start_item; - struct btrfs_item *end_item; int data_len; int nritems = btrfs_header_nritems(l); int end = min(nritems, start + nr) - 1; if (!nr) return 0; - start_item = btrfs_item_nr(start); - end_item = btrfs_item_nr(end); - data_len = btrfs_item_offset(l, start_item) + - btrfs_item_size(l, start_item); - data_len = data_len - btrfs_item_offset(l, end_item); + data_len = btrfs_item_offset_nr(l, start) + + btrfs_item_size_nr(l, start); + data_len = data_len - btrfs_item_offset_nr(l, end); data_len += sizeof(struct btrfs_item) * nr; WARN_ON(data_len < 0); return data_len;@@ -2690,8 +2686,6 @@ static noinline int __push_leaf_right(struct btrfs_path *path, slot = path->slots[1]; i = left_nritems - 1; while (i >= nr) { - item = btrfs_item_nr(i); - if (!empty && push_items > 0) { if (path->slots[0] > i) break;@@ -2706,7 +2700,7 @@ static noinline int __push_leaf_right(struct btrfs_path *path, if (path->slots[0] == i) push_space += data_size; - this_item_size = btrfs_item_size(left, item); + this_item_size = btrfs_item_size_nr(left, i); if (this_item_size + sizeof(*item) + push_space > free_space) break;@@ -2917,8 +2911,6 @@ static noinline int __push_leaf_left(struct btrfs_path *path, int data_size, nr = min(right_nritems - 1, max_slot); for (i = 0; i < nr; i++) { - item = btrfs_item_nr(i); - if (!empty && push_items > 0) { if (path->slots[0] < i) break;@@ -2933,7 +2925,7 @@ static noinline int __push_leaf_left(struct btrfs_path *path, int data_size, if (path->slots[0] == i) push_space += data_size; - this_item_size = btrfs_item_size(right, item); + this_item_size = btrfs_item_size_nr(right, i); if (this_item_size + sizeof(*item) + push_space > free_space) break;@@ -3500,8 +3492,8 @@ static noinline int split_item(struct btrfs_path *path, BUG_ON(btrfs_leaf_free_space(leaf) < sizeof(struct btrfs_item)); item = btrfs_item_nr(path->slots[0]); - orig_offset = btrfs_item_offset(leaf, item); - item_size = btrfs_item_size(leaf, item); + orig_offset = btrfs_item_offset_nr(leaf, path->slots[0]); + item_size = btrfs_item_size_nr(leaf, path->slots[0]); buf = kmalloc(item_size, GFP_NOFS); if (!buf)diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c index 7721ce0c0604..7f46c42a26fa 100644 --- a/fs/btrfs/dir-item.c +++ b/fs/btrfs/dir-item.c@@ -27,7 +27,6 @@ static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle struct btrfs_fs_info *fs_info = root->fs_info; int ret; char *ptr; - struct btrfs_item *item; struct extent_buffer *leaf; ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);@@ -41,10 +40,9 @@ static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle return ERR_PTR(ret); WARN_ON(ret > 0); leaf = path->nodes[0]; - item = btrfs_item_nr(path->slots[0]); ptr = btrfs_item_ptr(leaf, path->slots[0], char); - BUG_ON(data_size > btrfs_item_size(leaf, item)); - ptr += btrfs_item_size(leaf, item) - data_size; + ASSERT(data_size <= btrfs_item_size_nr(leaf, path->slots[0])); + ptr += btrfs_item_size_nr(leaf, path->slots[0]) - data_size; return (struct btrfs_dir_item *)ptr; }diff --git a/fs/btrfs/inode-item.c b/fs/btrfs/inode-item.c index 37f36ffdaf6b..65111c484d15 100644 --- a/fs/btrfs/inode-item.c +++ b/fs/btrfs/inode-item.c@@ -256,7 +256,6 @@ static int btrfs_insert_inode_extref(struct btrfs_trans_handle *trans, struct btrfs_path *path; struct btrfs_key key; struct extent_buffer *leaf; - struct btrfs_item *item; key.objectid = inode_objectid; key.type = BTRFS_INODE_EXTREF_KEY;@@ -282,9 +281,8 @@ static int btrfs_insert_inode_extref(struct btrfs_trans_handle *trans, goto out; leaf = path->nodes[0]; - item = btrfs_item_nr(path->slots[0]); ptr = (unsigned long)btrfs_item_ptr(leaf, path->slots[0], char); - ptr += btrfs_item_size(leaf, item) - ins_len; + ptr += btrfs_item_size_nr(leaf, path->slots[0]) - ins_len; extref = (struct btrfs_inode_extref *)ptr; btrfs_set_inode_extref_name_len(path->nodes[0], extref, name_len);diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c index aae1027bd76a..52370af39afe 100644 --- a/fs/btrfs/print-tree.c +++ b/fs/btrfs/print-tree.c@@ -200,7 +200,6 @@ void btrfs_print_leaf(struct extent_buffer *l) struct btrfs_fs_info *fs_info; int i; u32 type, nr; - struct btrfs_item *item; struct btrfs_root_item *ri; struct btrfs_dir_item *di; struct btrfs_inode_item *ii;@@ -224,12 +223,11 @@ void btrfs_print_leaf(struct extent_buffer *l) btrfs_leaf_free_space(l), btrfs_header_owner(l)); print_eb_refs_lock(l); for (i = 0 ; i < nr ; i++) { - item = btrfs_item_nr(i); btrfs_item_key_to_cpu(l, &key, i); type = key.type; pr_info("\titem %d key (%llu %u %llu) itemoff %d itemsize %d\n", i, key.objectid, type, key.offset, - btrfs_item_offset(l, item), btrfs_item_size(l, item)); + btrfs_item_offset_nr(l, i), btrfs_item_size_nr(l, i)); switch (type) { case BTRFS_INODE_ITEM_KEY: ii = btrfs_item_ptr(l, i, struct btrfs_inode_item);diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index afdcbe7844e0..e15f18dec9a6 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c@@ -886,7 +886,6 @@ static int iterate_inode_ref(struct btrfs_root *root, struct btrfs_path *path, iterate_inode_ref_t iterate, void *ctx) { struct extent_buffer *eb = path->nodes[0]; - struct btrfs_item *item; struct btrfs_inode_ref *iref; struct btrfs_inode_extref *extref; struct btrfs_path *tmp_path;@@ -918,8 +917,7 @@ static int iterate_inode_ref(struct btrfs_root *root, struct btrfs_path *path, if (found_key->type == BTRFS_INODE_REF_KEY) { ptr = (unsigned long)btrfs_item_ptr(eb, slot, struct btrfs_inode_ref); - item = btrfs_item_nr(slot); - total = btrfs_item_size(eb, item); + total = btrfs_item_size_nr(eb, slot); elem_size = sizeof(*iref); } else { ptr = btrfs_item_ptr_offset(eb, slot);@@ -1006,7 +1004,6 @@ static int iterate_dir_item(struct btrfs_root *root, struct btrfs_path *path, { int ret = 0; struct extent_buffer *eb; - struct btrfs_item *item; struct btrfs_dir_item *di; struct btrfs_key di_key; char *buf = NULL;@@ -1035,11 +1032,10 @@ static int iterate_dir_item(struct btrfs_root *root, struct btrfs_path *path, eb = path->nodes[0]; slot = path->slots[0]; - item = btrfs_item_nr(slot); di = btrfs_item_ptr(eb, slot, struct btrfs_dir_item); cur = 0; len = 0; - total = btrfs_item_size(eb, item); + total = btrfs_item_size_nr(eb, slot); num = 0; while (cur < total) {diff --git a/fs/btrfs/tests/extent-buffer-tests.c b/fs/btrfs/tests/extent-buffer-tests.c index 2a95f7224e18..bbef99175564 100644 --- a/fs/btrfs/tests/extent-buffer-tests.c +++ b/fs/btrfs/tests/extent-buffer-tests.c@@ -15,7 +15,6 @@ static int test_btrfs_split_item(u32 sectorsize, u32 nodesize) struct btrfs_path *path = NULL; struct btrfs_root *root = NULL; struct extent_buffer *eb; - struct btrfs_item *item; char *value = "mary had a little lamb"; char *split1 = "mary had a little"; char *split2 = " lamb";@@ -61,7 +60,6 @@ static int test_btrfs_split_item(u32 sectorsize, u32 nodesize) key.offset = 0; btrfs_setup_item_for_insert(root, path, &key, value_len); - item = btrfs_item_nr(0); write_extent_buffer(eb, value, btrfs_item_ptr_offset(eb, 0), value_len);@@ -90,8 +88,7 @@ static int test_btrfs_split_item(u32 sectorsize, u32 nodesize) goto out; } - item = btrfs_item_nr(0); - if (btrfs_item_size(eb, item) != strlen(split1)) { + if (btrfs_item_size_nr(eb, 0) != strlen(split1)) { test_err("invalid len in the first split"); ret = -EINVAL; goto out;@@ -115,8 +112,7 @@ static int test_btrfs_split_item(u32 sectorsize, u32 nodesize) goto out; } - item = btrfs_item_nr(1); - if (btrfs_item_size(eb, item) != strlen(split2)) { + if (btrfs_item_size_nr(eb, 1) != strlen(split2)) { test_err("invalid len in the second split"); ret = -EINVAL; goto out;@@ -147,8 +143,7 @@ static int test_btrfs_split_item(u32 sectorsize, u32 nodesize) goto out; } - item = btrfs_item_nr(0); - if (btrfs_item_size(eb, item) != strlen(split3)) { + if (btrfs_item_size_nr(eb, 0) != strlen(split3)) { test_err("invalid len in the first split"); ret = -EINVAL; goto out;@@ -171,8 +166,7 @@ static int test_btrfs_split_item(u32 sectorsize, u32 nodesize) goto out; } - item = btrfs_item_nr(1); - if (btrfs_item_size(eb, item) != strlen(split4)) { + if (btrfs_item_size_nr(eb, 1) != strlen(split4)) { test_err("invalid len in the second split"); ret = -EINVAL; goto out;@@ -195,8 +189,7 @@ static int test_btrfs_split_item(u32 sectorsize, u32 nodesize) goto out; } - item = btrfs_item_nr(2); - if (btrfs_item_size(eb, item) != strlen(split2)) { + if (btrfs_item_size_nr(eb, 2) != strlen(split2)) { test_err("invalid len in the second split"); ret = -EINVAL; goto out;diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c index 2837b4c8424d..0f04bb7f3ce4 100644 --- a/fs/btrfs/xattr.c +++ b/fs/btrfs/xattr.c@@ -170,7 +170,6 @@ int btrfs_setxattr(struct btrfs_trans_handle *trans, struct inode *inode, const u16 old_data_len = btrfs_dir_data_len(leaf, di); const u32 item_size = btrfs_item_size_nr(leaf, slot); const u32 data_size = sizeof(*di) + name_len + size; - struct btrfs_item *item; unsigned long data_ptr; char *ptr;@@ -196,9 +195,8 @@ int btrfs_setxattr(struct btrfs_trans_handle *trans, struct inode *inode, btrfs_extend_item(path, data_size); } - item = btrfs_item_nr(slot); ptr = btrfs_item_ptr(leaf, slot, char); - ptr += btrfs_item_size(leaf, item) - data_size; + ptr += btrfs_item_size_nr(leaf, slot) - data_size; di = (struct btrfs_dir_item *)ptr; btrfs_set_dir_data_len(leaf, di, size); data_ptr = ((unsigned long)(di + 1)) + name_len;