mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-07 02:16:40 +07:00
09cbfeaf1a
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time ago with promise that one day it will be possible to implement page cache with bigger chunks than PAGE_SIZE. This promise never materialized. And unlikely will. We have many places where PAGE_CACHE_SIZE assumed to be equal to PAGE_SIZE. And it's constant source of confusion on whether PAGE_CACHE_* or PAGE_* constant should be used in a particular case, especially on the border between fs and mm. Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much breakage to be doable. Let's stop pretending that pages in page cache are special. They are not. The changes are pretty straight-forward: - <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>; - <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>; - PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN}; - page_cache_get() -> get_page(); - page_cache_release() -> put_page(); This patch contains automated changes generated with coccinelle using script below. For some reason, coccinelle doesn't patch header files. I've called spatch for them manually. The only adjustment after coccinelle is revert of changes to PAGE_CAHCE_ALIGN definition: we are going to drop it later. There are few places in the code where coccinelle didn't reach. I'll fix them manually in a separate patch. Comments and documentation also will be addressed with the separate patch. virtual patch @@ expression E; @@ - E << (PAGE_CACHE_SHIFT - PAGE_SHIFT) + E @@ expression E; @@ - E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) + E @@ @@ - PAGE_CACHE_SHIFT + PAGE_SHIFT @@ @@ - PAGE_CACHE_SIZE + PAGE_SIZE @@ @@ - PAGE_CACHE_MASK + PAGE_MASK @@ expression E; @@ - PAGE_CACHE_ALIGN(E) + PAGE_ALIGN(E) @@ expression E; @@ - page_cache_get(E) + get_page(E) @@ expression E; @@ - page_cache_release(E) + put_page(E) Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
370 lines
8.6 KiB
C
370 lines
8.6 KiB
C
/*
|
|
* linux/fs/hfs/btree.c
|
|
*
|
|
* Copyright (C) 2001
|
|
* Brad Boyer (flar@allandria.com)
|
|
* (C) 2003 Ardis Technologies <roman@ardistech.com>
|
|
*
|
|
* Handle opening/closing btree
|
|
*/
|
|
|
|
#include <linux/pagemap.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/log2.h>
|
|
|
|
#include "btree.h"
|
|
|
|
/* Get a reference to a B*Tree and do some initial checks */
|
|
struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id, btree_keycmp keycmp)
|
|
{
|
|
struct hfs_btree *tree;
|
|
struct hfs_btree_header_rec *head;
|
|
struct address_space *mapping;
|
|
struct page *page;
|
|
unsigned int size;
|
|
|
|
tree = kzalloc(sizeof(*tree), GFP_KERNEL);
|
|
if (!tree)
|
|
return NULL;
|
|
|
|
mutex_init(&tree->tree_lock);
|
|
spin_lock_init(&tree->hash_lock);
|
|
/* Set the correct compare function */
|
|
tree->sb = sb;
|
|
tree->cnid = id;
|
|
tree->keycmp = keycmp;
|
|
|
|
tree->inode = iget_locked(sb, id);
|
|
if (!tree->inode)
|
|
goto free_tree;
|
|
BUG_ON(!(tree->inode->i_state & I_NEW));
|
|
{
|
|
struct hfs_mdb *mdb = HFS_SB(sb)->mdb;
|
|
HFS_I(tree->inode)->flags = 0;
|
|
mutex_init(&HFS_I(tree->inode)->extents_lock);
|
|
switch (id) {
|
|
case HFS_EXT_CNID:
|
|
hfs_inode_read_fork(tree->inode, mdb->drXTExtRec, mdb->drXTFlSize,
|
|
mdb->drXTFlSize, be32_to_cpu(mdb->drXTClpSiz));
|
|
if (HFS_I(tree->inode)->alloc_blocks >
|
|
HFS_I(tree->inode)->first_blocks) {
|
|
pr_err("invalid btree extent records\n");
|
|
unlock_new_inode(tree->inode);
|
|
goto free_inode;
|
|
}
|
|
|
|
tree->inode->i_mapping->a_ops = &hfs_btree_aops;
|
|
break;
|
|
case HFS_CAT_CNID:
|
|
hfs_inode_read_fork(tree->inode, mdb->drCTExtRec, mdb->drCTFlSize,
|
|
mdb->drCTFlSize, be32_to_cpu(mdb->drCTClpSiz));
|
|
|
|
if (!HFS_I(tree->inode)->first_blocks) {
|
|
pr_err("invalid btree extent records (0 size)\n");
|
|
unlock_new_inode(tree->inode);
|
|
goto free_inode;
|
|
}
|
|
|
|
tree->inode->i_mapping->a_ops = &hfs_btree_aops;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
unlock_new_inode(tree->inode);
|
|
|
|
mapping = tree->inode->i_mapping;
|
|
page = read_mapping_page(mapping, 0, NULL);
|
|
if (IS_ERR(page))
|
|
goto free_inode;
|
|
|
|
/* Load the header */
|
|
head = (struct hfs_btree_header_rec *)(kmap(page) + sizeof(struct hfs_bnode_desc));
|
|
tree->root = be32_to_cpu(head->root);
|
|
tree->leaf_count = be32_to_cpu(head->leaf_count);
|
|
tree->leaf_head = be32_to_cpu(head->leaf_head);
|
|
tree->leaf_tail = be32_to_cpu(head->leaf_tail);
|
|
tree->node_count = be32_to_cpu(head->node_count);
|
|
tree->free_nodes = be32_to_cpu(head->free_nodes);
|
|
tree->attributes = be32_to_cpu(head->attributes);
|
|
tree->node_size = be16_to_cpu(head->node_size);
|
|
tree->max_key_len = be16_to_cpu(head->max_key_len);
|
|
tree->depth = be16_to_cpu(head->depth);
|
|
|
|
size = tree->node_size;
|
|
if (!is_power_of_2(size))
|
|
goto fail_page;
|
|
if (!tree->node_count)
|
|
goto fail_page;
|
|
switch (id) {
|
|
case HFS_EXT_CNID:
|
|
if (tree->max_key_len != HFS_MAX_EXT_KEYLEN) {
|
|
pr_err("invalid extent max_key_len %d\n",
|
|
tree->max_key_len);
|
|
goto fail_page;
|
|
}
|
|
break;
|
|
case HFS_CAT_CNID:
|
|
if (tree->max_key_len != HFS_MAX_CAT_KEYLEN) {
|
|
pr_err("invalid catalog max_key_len %d\n",
|
|
tree->max_key_len);
|
|
goto fail_page;
|
|
}
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
tree->node_size_shift = ffs(size) - 1;
|
|
tree->pages_per_bnode = (tree->node_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
|
|
|
|
kunmap(page);
|
|
put_page(page);
|
|
return tree;
|
|
|
|
fail_page:
|
|
put_page(page);
|
|
free_inode:
|
|
tree->inode->i_mapping->a_ops = &hfs_aops;
|
|
iput(tree->inode);
|
|
free_tree:
|
|
kfree(tree);
|
|
return NULL;
|
|
}
|
|
|
|
/* Release resources used by a btree */
|
|
void hfs_btree_close(struct hfs_btree *tree)
|
|
{
|
|
struct hfs_bnode *node;
|
|
int i;
|
|
|
|
if (!tree)
|
|
return;
|
|
|
|
for (i = 0; i < NODE_HASH_SIZE; i++) {
|
|
while ((node = tree->node_hash[i])) {
|
|
tree->node_hash[i] = node->next_hash;
|
|
if (atomic_read(&node->refcnt))
|
|
pr_err("node %d:%d still has %d user(s)!\n",
|
|
node->tree->cnid, node->this,
|
|
atomic_read(&node->refcnt));
|
|
hfs_bnode_free(node);
|
|
tree->node_hash_cnt--;
|
|
}
|
|
}
|
|
iput(tree->inode);
|
|
kfree(tree);
|
|
}
|
|
|
|
void hfs_btree_write(struct hfs_btree *tree)
|
|
{
|
|
struct hfs_btree_header_rec *head;
|
|
struct hfs_bnode *node;
|
|
struct page *page;
|
|
|
|
node = hfs_bnode_find(tree, 0);
|
|
if (IS_ERR(node))
|
|
/* panic? */
|
|
return;
|
|
/* Load the header */
|
|
page = node->page[0];
|
|
head = (struct hfs_btree_header_rec *)(kmap(page) + sizeof(struct hfs_bnode_desc));
|
|
|
|
head->root = cpu_to_be32(tree->root);
|
|
head->leaf_count = cpu_to_be32(tree->leaf_count);
|
|
head->leaf_head = cpu_to_be32(tree->leaf_head);
|
|
head->leaf_tail = cpu_to_be32(tree->leaf_tail);
|
|
head->node_count = cpu_to_be32(tree->node_count);
|
|
head->free_nodes = cpu_to_be32(tree->free_nodes);
|
|
head->attributes = cpu_to_be32(tree->attributes);
|
|
head->depth = cpu_to_be16(tree->depth);
|
|
|
|
kunmap(page);
|
|
set_page_dirty(page);
|
|
hfs_bnode_put(node);
|
|
}
|
|
|
|
static struct hfs_bnode *hfs_bmap_new_bmap(struct hfs_bnode *prev, u32 idx)
|
|
{
|
|
struct hfs_btree *tree = prev->tree;
|
|
struct hfs_bnode *node;
|
|
struct hfs_bnode_desc desc;
|
|
__be32 cnid;
|
|
|
|
node = hfs_bnode_create(tree, idx);
|
|
if (IS_ERR(node))
|
|
return node;
|
|
|
|
if (!tree->free_nodes)
|
|
panic("FIXME!!!");
|
|
tree->free_nodes--;
|
|
prev->next = idx;
|
|
cnid = cpu_to_be32(idx);
|
|
hfs_bnode_write(prev, &cnid, offsetof(struct hfs_bnode_desc, next), 4);
|
|
|
|
node->type = HFS_NODE_MAP;
|
|
node->num_recs = 1;
|
|
hfs_bnode_clear(node, 0, tree->node_size);
|
|
desc.next = 0;
|
|
desc.prev = 0;
|
|
desc.type = HFS_NODE_MAP;
|
|
desc.height = 0;
|
|
desc.num_recs = cpu_to_be16(1);
|
|
desc.reserved = 0;
|
|
hfs_bnode_write(node, &desc, 0, sizeof(desc));
|
|
hfs_bnode_write_u16(node, 14, 0x8000);
|
|
hfs_bnode_write_u16(node, tree->node_size - 2, 14);
|
|
hfs_bnode_write_u16(node, tree->node_size - 4, tree->node_size - 6);
|
|
|
|
return node;
|
|
}
|
|
|
|
struct hfs_bnode *hfs_bmap_alloc(struct hfs_btree *tree)
|
|
{
|
|
struct hfs_bnode *node, *next_node;
|
|
struct page **pagep;
|
|
u32 nidx, idx;
|
|
unsigned off;
|
|
u16 off16;
|
|
u16 len;
|
|
u8 *data, byte, m;
|
|
int i;
|
|
|
|
while (!tree->free_nodes) {
|
|
struct inode *inode = tree->inode;
|
|
u32 count;
|
|
int res;
|
|
|
|
res = hfs_extend_file(inode);
|
|
if (res)
|
|
return ERR_PTR(res);
|
|
HFS_I(inode)->phys_size = inode->i_size =
|
|
(loff_t)HFS_I(inode)->alloc_blocks *
|
|
HFS_SB(tree->sb)->alloc_blksz;
|
|
HFS_I(inode)->fs_blocks = inode->i_size >>
|
|
tree->sb->s_blocksize_bits;
|
|
inode_set_bytes(inode, inode->i_size);
|
|
count = inode->i_size >> tree->node_size_shift;
|
|
tree->free_nodes = count - tree->node_count;
|
|
tree->node_count = count;
|
|
}
|
|
|
|
nidx = 0;
|
|
node = hfs_bnode_find(tree, nidx);
|
|
if (IS_ERR(node))
|
|
return node;
|
|
len = hfs_brec_lenoff(node, 2, &off16);
|
|
off = off16;
|
|
|
|
off += node->page_offset;
|
|
pagep = node->page + (off >> PAGE_SHIFT);
|
|
data = kmap(*pagep);
|
|
off &= ~PAGE_MASK;
|
|
idx = 0;
|
|
|
|
for (;;) {
|
|
while (len) {
|
|
byte = data[off];
|
|
if (byte != 0xff) {
|
|
for (m = 0x80, i = 0; i < 8; m >>= 1, i++) {
|
|
if (!(byte & m)) {
|
|
idx += i;
|
|
data[off] |= m;
|
|
set_page_dirty(*pagep);
|
|
kunmap(*pagep);
|
|
tree->free_nodes--;
|
|
mark_inode_dirty(tree->inode);
|
|
hfs_bnode_put(node);
|
|
return hfs_bnode_create(tree, idx);
|
|
}
|
|
}
|
|
}
|
|
if (++off >= PAGE_SIZE) {
|
|
kunmap(*pagep);
|
|
data = kmap(*++pagep);
|
|
off = 0;
|
|
}
|
|
idx += 8;
|
|
len--;
|
|
}
|
|
kunmap(*pagep);
|
|
nidx = node->next;
|
|
if (!nidx) {
|
|
printk(KERN_DEBUG "create new bmap node...\n");
|
|
next_node = hfs_bmap_new_bmap(node, idx);
|
|
} else
|
|
next_node = hfs_bnode_find(tree, nidx);
|
|
hfs_bnode_put(node);
|
|
if (IS_ERR(next_node))
|
|
return next_node;
|
|
node = next_node;
|
|
|
|
len = hfs_brec_lenoff(node, 0, &off16);
|
|
off = off16;
|
|
off += node->page_offset;
|
|
pagep = node->page + (off >> PAGE_SHIFT);
|
|
data = kmap(*pagep);
|
|
off &= ~PAGE_MASK;
|
|
}
|
|
}
|
|
|
|
void hfs_bmap_free(struct hfs_bnode *node)
|
|
{
|
|
struct hfs_btree *tree;
|
|
struct page *page;
|
|
u16 off, len;
|
|
u32 nidx;
|
|
u8 *data, byte, m;
|
|
|
|
hfs_dbg(BNODE_MOD, "btree_free_node: %u\n", node->this);
|
|
tree = node->tree;
|
|
nidx = node->this;
|
|
node = hfs_bnode_find(tree, 0);
|
|
if (IS_ERR(node))
|
|
return;
|
|
len = hfs_brec_lenoff(node, 2, &off);
|
|
while (nidx >= len * 8) {
|
|
u32 i;
|
|
|
|
nidx -= len * 8;
|
|
i = node->next;
|
|
hfs_bnode_put(node);
|
|
if (!i) {
|
|
/* panic */;
|
|
pr_crit("unable to free bnode %u. bmap not found!\n",
|
|
node->this);
|
|
return;
|
|
}
|
|
node = hfs_bnode_find(tree, i);
|
|
if (IS_ERR(node))
|
|
return;
|
|
if (node->type != HFS_NODE_MAP) {
|
|
/* panic */;
|
|
pr_crit("invalid bmap found! (%u,%d)\n",
|
|
node->this, node->type);
|
|
hfs_bnode_put(node);
|
|
return;
|
|
}
|
|
len = hfs_brec_lenoff(node, 0, &off);
|
|
}
|
|
off += node->page_offset + nidx / 8;
|
|
page = node->page[off >> PAGE_SHIFT];
|
|
data = kmap(page);
|
|
off &= ~PAGE_MASK;
|
|
m = 1 << (~nidx & 7);
|
|
byte = data[off];
|
|
if (!(byte & m)) {
|
|
pr_crit("trying to free free bnode %u(%d)\n",
|
|
node->this, node->type);
|
|
kunmap(page);
|
|
hfs_bnode_put(node);
|
|
return;
|
|
}
|
|
data[off] = byte & ~m;
|
|
set_page_dirty(page);
|
|
kunmap(page);
|
|
hfs_bnode_put(node);
|
|
tree->free_nodes++;
|
|
mark_inode_dirty(tree->inode);
|
|
}
|