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提交 0783fcfc 编写于 作者: C Chris Mason 提交者： David Woodhouse
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Btrfs: struct item endian fixes 

Signed-off-by: NChris Mason <chris.mason@oracle.com>
上级 e2fa7227
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Showing with 141 addition and 90 deletion
fs/btrfs/ctree.c
浏览文件 @ 0783fcfc
......@@ -76,7 +76,7 @@ static inline unsigned int leaf_data_end(struct leaf *leaf)
u32 nr = btrfs_header_nritems(&leaf->header);
if (nr == 0)
return sizeof(leaf->data);
return leaf->items[nr-1].offset;
return btrfs_item_offset(leaf->items + nr - 1);
}
/*
......@@ -174,10 +174,11 @@ int check_leaf(struct ctree_path *path, int level)
btrfs_disk_key_to_cpu(&cpukey, &leaf->items[i + 1].key);
BUG_ON(comp_keys(&leaf->items[i].key,
&cpukey) >= 0);
BUG_ON(leaf->items[i].offset != leaf->items[i + 1].offset +
leaf->items[i + 1].size);
BUG_ON(btrfs_item_offset(leaf->items + i) !=
btrfs_item_end(leaf->items + i + 1));
if (i == 0) {
BUG_ON(leaf->items[i].offset + leaf->items[i].size !=
BUG_ON(btrfs_item_offset(leaf->items + i) +
btrfs_item_size(leaf->items + i) !=
LEAF_DATA_SIZE);
}
}
......@@ -235,7 +236,8 @@ int bin_search(struct node *c, struct btrfs_key *key, int *slot)
{
if (btrfs_is_leaf(c)) {
struct leaf *l = (struct leaf *)c;
return generic_bin_search((void *)l->items, sizeof(struct item),
return generic_bin_search((void *)l->items,
sizeof(struct btrfs_item),
key, btrfs_header_nritems(&c->header),
slot);
} else {
......@@ -485,7 +487,7 @@ int search_slot(struct ctree_root *root, struct btrfs_key *key,
struct leaf *l = (struct leaf *)c;
p->slots[level] = slot;
if (ins_len > 0 && leaf_free_space(l) <
sizeof(struct item) + ins_len) {
sizeof(struct btrfs_item) + ins_len) {
int sret = split_leaf(root, p, ins_len);
BUG_ON(sret > 0);
if (sret)
......@@ -780,9 +782,9 @@ static int leaf_space_used(struct leaf *l, int start, int nr)
if (!nr)
return 0;
data_len = l->items[start].offset + l->items[start].size;
data_len = data_len - l->items[end].offset;
data_len += sizeof(struct item) * nr;
data_len = btrfs_item_end(l->items + start);
data_len = data_len - btrfs_item_offset(l->items + end);
data_len += sizeof(struct btrfs_item) * nr;
return data_len;
}
......@@ -806,7 +808,7 @@ static int push_leaf_right(struct ctree_root *root, struct ctree_path *path,
int free_space;
int push_space = 0;
int push_items = 0;
struct item *item;
struct btrfs_item *item;
u32 left_nritems;
u32 right_nritems;
......@@ -821,7 +823,7 @@ static int push_leaf_right(struct ctree_root *root, struct ctree_path *path,
right_buf = read_tree_block(root, upper->node.blockptrs[slot + 1]);
right = &right_buf->leaf;
free_space = leaf_free_space(right);
if (free_space < data_size + sizeof(struct item)) {
if (free_space < data_size + sizeof(struct btrfs_item)) {
tree_block_release(root, right_buf);
return 1;
}
......@@ -829,7 +831,7 @@ static int push_leaf_right(struct ctree_root *root, struct ctree_path *path,
btrfs_cow_block(root, right_buf, upper, slot + 1, &right_buf);
right = &right_buf->leaf;
free_space = leaf_free_space(right);
if (free_space < data_size + sizeof(struct item)) {
if (free_space < data_size + sizeof(struct btrfs_item)) {
tree_block_release(root, right_buf);
return 1;
}
......@@ -839,10 +841,11 @@ static int push_leaf_right(struct ctree_root *root, struct ctree_path *path,
item = left->items + i;
if (path->slots[0] == i)
push_space += data_size + sizeof(*item);
if (item->size + sizeof(*item) + push_space > free_space)
if (btrfs_item_size(item) + sizeof(*item) + push_space >
free_space)
break;
push_items++;
push_space += item->size + sizeof(*item);
push_space += btrfs_item_size(item) + sizeof(*item);
}
if (push_items == 0) {
tree_block_release(root, right_buf);
......@@ -850,8 +853,7 @@ static int push_leaf_right(struct ctree_root *root, struct ctree_path *path,
}
right_nritems = btrfs_header_nritems(&right->header);
/* push left to right */
push_space = left->items[left_nritems - push_items].offset +
left->items[left_nritems - push_items].size;
push_space = btrfs_item_end(left->items + left_nritems - push_items);
push_space -= leaf_data_end(left);
/* make room in the right data area */
memmove(right->data + leaf_data_end(right) - push_space,
......@@ -862,18 +864,19 @@ static int push_leaf_right(struct ctree_root *root, struct ctree_path *path,
left->data + leaf_data_end(left),
push_space);
memmove(right->items + push_items, right->items,
right_nritems * sizeof(struct item));
right_nritems * sizeof(struct btrfs_item));
/* copy the items from left to right */
memcpy(right->items, left->items + left_nritems - push_items,
push_items * sizeof(struct item));
push_items * sizeof(struct btrfs_item));
/* update the item pointers */
right_nritems += push_items;
btrfs_set_header_nritems(&right->header, right_nritems);
push_space = LEAF_DATA_SIZE;
for (i = 0; i < right_nritems; i++) {
right->items[i].offset = push_space - right->items[i].size;
push_space = right->items[i].offset;
btrfs_set_item_offset(right->items + i, push_space -
btrfs_item_size(right->items + i));
push_space = btrfs_item_offset(right->items + i);
}
left_nritems -= push_items;
btrfs_set_header_nritems(&left->header, left_nritems);
......@@ -911,7 +914,7 @@ static int push_leaf_left(struct ctree_root *root, struct ctree_path *path,
int free_space;
int push_space = 0;
int push_items = 0;
struct item *item;
struct btrfs_item *item;
u32 old_left_nritems;
int ret = 0;
int wret;
......@@ -926,7 +929,7 @@ static int push_leaf_left(struct ctree_root *root, struct ctree_path *path,
t = read_tree_block(root, path->nodes[1]->node.blockptrs[slot - 1]);
left = &t->leaf;
free_space = leaf_free_space(left);
if (free_space < data_size + sizeof(struct item)) {
if (free_space < data_size + sizeof(struct btrfs_item)) {
tree_block_release(root, t);
return 1;
}
......@@ -935,7 +938,7 @@ static int push_leaf_left(struct ctree_root *root, struct ctree_path *path,
btrfs_cow_block(root, t, path->nodes[1], slot - 1, &t);
left = &t->leaf;
free_space = leaf_free_space(left);
if (free_space < data_size + sizeof(struct item)) {
if (free_space < data_size + sizeof(struct btrfs_item)) {
tree_block_release(root, t);
return 1;
}
......@@ -944,10 +947,11 @@ static int push_leaf_left(struct ctree_root *root, struct ctree_path *path,
item = right->items + i;
if (path->slots[0] == i)
push_space += data_size + sizeof(*item);
if (item->size + sizeof(*item) + push_space > free_space)
if (btrfs_item_size(item) + sizeof(*item) + push_space >
free_space)
break;
push_items++;
push_space += item->size + sizeof(*item);
push_space += btrfs_item_size(item) + sizeof(*item);
}
if (push_items == 0) {
tree_block_release(root, t);
......@@ -955,35 +959,40 @@ static int push_leaf_left(struct ctree_root *root, struct ctree_path *path,
}
/* push data from right to left */
memcpy(left->items + btrfs_header_nritems(&left->header),
right->items, push_items * sizeof(struct item));
push_space = LEAF_DATA_SIZE - right->items[push_items -1].offset;
right->items, push_items * sizeof(struct btrfs_item));
push_space = LEAF_DATA_SIZE -
btrfs_item_offset(right->items + push_items -1);
memcpy(left->data + leaf_data_end(left) - push_space,
right->data + right->items[push_items - 1].offset,
right->data + btrfs_item_offset(right->items + push_items - 1),
push_space);
old_left_nritems = btrfs_header_nritems(&left->header);
BUG_ON(old_left_nritems < 0);
for(i = old_left_nritems; i < old_left_nritems + push_items; i++) {
left->items[i].offset -= LEAF_DATA_SIZE -
left->items[old_left_nritems -1].offset;
for (i = old_left_nritems; i < old_left_nritems + push_items; i++) {
u16 ioff = btrfs_item_offset(left->items + i);
btrfs_set_item_offset(left->items + i, ioff - (LEAF_DATA_SIZE -
btrfs_item_offset(left->items +
old_left_nritems - 1)));
}
btrfs_set_header_nritems(&left->header, old_left_nritems + push_items);
/* fixup right node */
push_space = right->items[push_items-1].offset - leaf_data_end(right);
push_space = btrfs_item_offset(right->items + push_items - 1) -
leaf_data_end(right);
memmove(right->data + LEAF_DATA_SIZE - push_space, right->data +
leaf_data_end(right), push_space);
memmove(right->items, right->items + push_items,
(btrfs_header_nritems(&right->header) - push_items) *
sizeof(struct item));
sizeof(struct btrfs_item));
btrfs_set_header_nritems(&right->header,
btrfs_header_nritems(&right->header) -
push_items);
push_space = LEAF_DATA_SIZE;
for (i = 0; i < btrfs_header_nritems(&right->header); i++) {
right->items[i].offset = push_space - right->items[i].size;
push_space = right->items[i].offset;
btrfs_set_item_offset(right->items + i, push_space -
btrfs_item_size(right->items + i));
push_space = btrfs_item_offset(right->items + i);
}
BUG_ON(list_empty(&t->dirty));
......@@ -1023,7 +1032,7 @@ static int split_leaf(struct ctree_root *root, struct ctree_path *path,
int slot;
struct leaf *right;
struct tree_buffer *right_buffer;
int space_needed = data_size + sizeof(struct item);
int space_needed = data_size + sizeof(struct btrfs_item);
int data_copy_size;
int rt_data_off;
int i;
......@@ -1034,7 +1043,7 @@ static int split_leaf(struct ctree_root *root, struct ctree_path *path,
l = &l_buf->leaf;
/* did the pushes work? */
if (leaf_free_space(l) >= sizeof(struct item) + data_size)
if (leaf_free_space(l) >= sizeof(struct btrfs_item) + data_size)
return 0;
if (!path->nodes[1]) {
......@@ -1066,17 +1075,17 @@ static int split_leaf(struct ctree_root *root, struct ctree_path *path,
btrfs_set_header_level(&right->header, 0);
btrfs_set_header_parentid(&right->header,
btrfs_header_parentid(&root->node->node.header));
data_copy_size = l->items[mid].offset + l->items[mid].size -
leaf_data_end(l);
data_copy_size = btrfs_item_end(l->items + mid) - leaf_data_end(l);
memcpy(right->items, l->items + mid,
(nritems - mid) * sizeof(struct item));
(nritems - mid) * sizeof(struct btrfs_item));
memcpy(right->data + LEAF_DATA_SIZE - data_copy_size,
l->data + leaf_data_end(l), data_copy_size);
rt_data_off = LEAF_DATA_SIZE -
(l->items[mid].offset + l->items[mid].size);
rt_data_off = LEAF_DATA_SIZE - btrfs_item_end(l->items + mid);
for (i = 0; i < btrfs_header_nritems(&right->header); i++)
right->items[i].offset += rt_data_off;
for (i = 0; i < btrfs_header_nritems(&right->header); i++) {
u16 ioff = btrfs_item_offset(right->items + i);
btrfs_set_item_offset(right->items + i, ioff + rt_data_off);
}
btrfs_set_header_nritems(&l->header, mid);
ret = 0;
......@@ -1136,26 +1145,28 @@ int insert_item(struct ctree_root *root, struct btrfs_key *cpu_key,
nritems = btrfs_header_nritems(&leaf->header);
data_end = leaf_data_end(leaf);
if (leaf_free_space(leaf) < sizeof(struct item) + data_size)
if (leaf_free_space(leaf) < sizeof(struct btrfs_item) + data_size)
BUG();
slot = path.slots[0];
BUG_ON(slot < 0);
if (slot != nritems) {
int i;
unsigned int old_data = leaf->items[slot].offset +
leaf->items[slot].size;
unsigned int old_data = btrfs_item_end(leaf->items + slot);
/*
* item0..itemN ... dataN.offset..dataN.size .. data0.size
*/
/* first correct the data pointers */
for (i = slot; i < nritems; i++)
leaf->items[i].offset -= data_size;
for (i = slot; i < nritems; i++) {
u16 ioff = btrfs_item_offset(leaf->items + i);
btrfs_set_item_offset(leaf->items + i,
ioff - data_size);
}
/* shift the items */
memmove(leaf->items + slot + 1, leaf->items + slot,
(nritems - slot) * sizeof(struct item));
(nritems - slot) * sizeof(struct btrfs_item));
/* shift the data */
memmove(leaf->data + data_end - data_size, leaf->data +
......@@ -1165,8 +1176,8 @@ int insert_item(struct ctree_root *root, struct btrfs_key *cpu_key,
/* copy the new data in */
memcpy(&leaf->items[slot].key, &disk_key,
sizeof(struct btrfs_disk_key));
leaf->items[slot].offset = data_end - data_size;
leaf->items[slot].size = data_size;
btrfs_set_item_offset(leaf->items + slot, data_end - data_size);
btrfs_set_item_size(leaf->items + slot, data_size);
memcpy(leaf->data + data_end - data_size, data, data_size);
btrfs_set_header_nritems(&leaf->header, nritems + 1);
......@@ -1241,8 +1252,8 @@ int del_item(struct ctree_root *root, struct ctree_path *path)
leaf_buf = path->nodes[0];
leaf = &leaf_buf->leaf;
slot = path->slots[0];
doff = leaf->items[slot].offset;
dsize = leaf->items[slot].size;
doff = btrfs_item_offset(leaf->items + slot);
dsize = btrfs_item_size(leaf->items + slot);
nritems = btrfs_header_nritems(&leaf->header);
if (slot != nritems - 1) {
......@@ -1251,10 +1262,12 @@ int del_item(struct ctree_root *root, struct ctree_path *path)
memmove(leaf->data + data_end + dsize,
leaf->data + data_end,
doff - data_end);
for (i = slot + 1; i < nritems; i++)
leaf->items[i].offset += dsize;
for (i = slot + 1; i < nritems; i++) {
u16 ioff = btrfs_item_offset(leaf->items + i);
btrfs_set_item_offset(leaf->items + i, ioff + dsize);
}
memmove(leaf->items + slot, leaf->items + slot + 1,
sizeof(struct item) *
sizeof(struct btrfs_item) *
(nritems - slot - 1));
}
btrfs_set_header_nritems(&leaf->header, nritems - 1);
......
fs/btrfs/ctree.h
浏览文件 @ 0783fcfc
......@@ -98,10 +98,10 @@ struct ctree_super_block {
* the key flags parameter. offset and size tell us where to find
* the item in the leaf (relative to the start of the data area)
*/
struct item {
struct btrfs_item {
struct btrfs_disk_key key;
u16 offset;
u16 size;
__le16 offset;
__le16 size;
} __attribute__ ((__packed__));
/*
......@@ -115,7 +115,8 @@ struct item {
struct leaf {
struct btrfs_header header;
union {
struct item items[LEAF_DATA_SIZE/sizeof(struct item)];
struct btrfs_item items[LEAF_DATA_SIZE/
sizeof(struct btrfs_item)];
u8 data[CTREE_BLOCKSIZE-sizeof(struct btrfs_header)];
};
} __attribute__ ((__packed__));
......@@ -152,6 +153,31 @@ struct ctree_path {
int slots[MAX_LEVEL];
};
static inline u16 btrfs_item_offset(struct btrfs_item *item)
{
return le16_to_cpu(item->offset);
}
static inline void btrfs_set_item_offset(struct btrfs_item *item, u16 val)
{
item->offset = cpu_to_le16(val);
}
static inline u16 btrfs_item_end(struct btrfs_item *item)
{
return le16_to_cpu(item->offset) + le16_to_cpu(item->size);
}
static inline u16 btrfs_item_size(struct btrfs_item *item)
{
return le16_to_cpu(item->size);
}
static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
{
item->size = cpu_to_le16(val);
}
static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
struct btrfs_disk_key *disk)
{
......
fs/btrfs/extent-tree.c
浏览文件 @ 0783fcfc
......@@ -40,8 +40,8 @@ static int inc_block_ref(struct ctree_root *root, u64 blocknr)
BUG();
BUG_ON(ret != 0);
l = &path.nodes[0]->leaf;
item = (struct extent_item *)(l->data +
l->items[path.slots[0]].offset);
item = (struct extent_item *)(l->data + btrfs_item_offset(l->items +
path.slots[0]));
item->refs++;
BUG_ON(list_empty(&path.nodes[0]->dirty));
......@@ -67,7 +67,8 @@ static int lookup_block_ref(struct ctree_root *root, u64 blocknr, u32 *refs)
BUG();
l = &path.nodes[0]->leaf;
item = (struct extent_item *)(l->data +
l->items[path.slots[0]].offset);
btrfs_item_offset(l->items +
path.slots[0]));
*refs = item->refs;
release_path(root->extent_root, &path);
return 0;
......@@ -144,7 +145,7 @@ int __free_extent(struct ctree_root *root, u64 blocknr, u64 num_blocks)
struct btrfs_key key;
struct ctree_root *extent_root = root->extent_root;
int ret;
struct item *item;
struct btrfs_item *item;
struct extent_item *ei;
struct btrfs_key ins;
......@@ -162,7 +163,8 @@ int __free_extent(struct ctree_root *root, u64 blocknr, u64 num_blocks)
BUG();
}
item = path.nodes[0]->leaf.items + path.slots[0];
ei = (struct extent_item *)(path.nodes[0]->leaf.data + item->offset);
ei = (struct extent_item *)(path.nodes[0]->leaf.data +
btrfs_item_offset(item));
BUG_ON(ei->refs == 0);
ei->refs--;
if (ei->refs == 0) {
......
fs/btrfs/mkfs.c
浏览文件 @ 0783fcfc
......@@ -14,7 +14,7 @@ int mkfs(int fd)
{
struct ctree_root_info info[2];
struct leaf empty_leaf;
struct item item;
struct btrfs_item item;
struct extent_item extent_item;
int ret;
......@@ -45,31 +45,37 @@ int mkfs(int fd)
btrfs_set_header_nritems(&empty_leaf.header, 3);
/* item1, reserve blocks 0-16 */
item.key.objectid = cpu_to_le64(0);
item.key.offset = cpu_to_le64(17);
item.key.flags = cpu_to_le32(0);
item.offset = LEAF_DATA_SIZE - sizeof(struct extent_item);
item.size = sizeof(struct extent_item);
btrfs_set_key_objectid(&item.key, 0);
btrfs_set_key_offset(&item.key, 17);
btrfs_set_key_flags(&item.key, 0);
btrfs_set_item_offset(&item,
LEAF_DATA_SIZE - sizeof(struct extent_item));
btrfs_set_item_size(&item, sizeof(struct extent_item));
extent_item.refs = 1;
extent_item.owner = 0;
memcpy(empty_leaf.items, &item, sizeof(item));
memcpy(empty_leaf.data + item.offset, &extent_item, item.size);
memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item,
btrfs_item_size(&item));
/* item2, give block 17 to the root */
item.key.objectid = cpu_to_le64(17);
item.key.offset = cpu_to_le64(1);
item.offset = LEAF_DATA_SIZE - sizeof(struct extent_item) * 2;
btrfs_set_key_objectid(&item.key, 17);
btrfs_set_key_offset(&item.key, 1);
btrfs_set_item_offset(&item,
LEAF_DATA_SIZE - sizeof(struct extent_item) * 2);
extent_item.owner = 1;
memcpy(empty_leaf.items + 1, &item, sizeof(item));
memcpy(empty_leaf.data + item.offset, &extent_item, item.size);
memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item,
btrfs_item_size(&item));
/* item3, give block 18 for the extent root */
item.key.objectid = cpu_to_le64(18);
item.key.offset = cpu_to_le64(1);
item.offset = LEAF_DATA_SIZE - sizeof(struct extent_item) * 3;
btrfs_set_key_objectid(&item.key, 18);
btrfs_set_key_offset(&item.key, 1);
btrfs_set_item_offset(&item,
LEAF_DATA_SIZE - sizeof(struct extent_item) * 3);
extent_item.owner = 2;
memcpy(empty_leaf.items + 2, &item, sizeof(item));
memcpy(empty_leaf.data + item.offset, &extent_item, item.size);
memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item,
btrfs_item_size(&item));
ret = pwrite(fd, &empty_leaf, sizeof(empty_leaf), 18 * CTREE_BLOCKSIZE);
if (ret != sizeof(empty_leaf))
return -1;
......
fs/btrfs/print-tree.c
浏览文件 @ 0783fcfc
......@@ -9,7 +9,7 @@ void print_leaf(struct leaf *l)
{
int i;
u32 nr = btrfs_header_nritems(&l->header);
struct item *item;
struct btrfs_item *item;
struct extent_item *ei;
printf("leaf %Lu total ptrs %d free space %d\n",
btrfs_header_blocknr(&l->header), nr, leaf_free_space(l));
......@@ -18,12 +18,15 @@ void print_leaf(struct leaf *l)
item = l->items + i;
printf("\titem %d key (%Lu %u %Lu) itemoff %d itemsize %d\n",
i,
item->key.objectid, item->key.flags, item->key.offset,
item->offset, item->size);
btrfs_key_objectid(&item->key),
btrfs_key_flags(&item->key),
btrfs_key_offset(&item->key),
btrfs_item_offset(item),
btrfs_item_size(item));
fflush(stdout);
printf("\t\titem data %.*s\n", item->size,
l->data+item->offset);
ei = (struct extent_item *)(l->data + item->offset);
printf("\t\titem data %.*s\n", btrfs_item_size(item),
l->data + btrfs_item_offset(item));
ei = (struct extent_item *)(l->data + btrfs_item_offset(item));
printf("\t\textent data refs %u owner %Lu\n", ei->refs,
ei->owner);
fflush(stdout);
......
fs/btrfs/random-test.c
浏览文件 @ 0783fcfc
......@@ -173,7 +173,7 @@ static int empty_tree(struct ctree_root *root, struct radix_tree_root *radix,
path.slots[0] -= 1;
}
slot = path.slots[0];
found = path.nodes[0]->leaf.items[slot].key.objectid;
found=btrfs_key_objectid(&path.nodes[0]->leaf.items[slot].key);
ret = del_item(root, &path);
count++;
if (ret) {
......@@ -274,7 +274,8 @@ static int fill_radix(struct ctree_root *root, struct radix_tree_root *radix)
slot -= 1;
}
for (i = slot; i >= 0; i--) {
found = path.nodes[0]->leaf.items[i].key.objectid;
found = btrfs_key_objectid(&path.nodes[0]->
leaf.items[i].key);
radix_tree_preload(GFP_KERNEL);
ret = radix_tree_insert(radix, found, (void *)found);
if (ret) {
......
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