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[PATCH] read_mapping_page for address space 

Add read_mapping_page() which is used for callers that pass
mapping->a_ops->readpage as the filler for read_cache_page.  This removes
some duplication from filesystem code.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Pekka Enberg 2006-06-23 02:05:08 -07:00 committed by Linus Torvalds
parent c330dda908
commit 090d2b185d
22 changed files with 38 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/afs/dir.c
View File

@ -185,9 +185,7 @@ static struct page *afs_dir_get_page(struct inode *dir, unsigned long index)
_enter("{%lu},%lu", dir->i_ino, index);
page = read_cache_page(dir->i_mapping,index,
(filler_t *) dir->i_mapping->a_ops->readpage,
NULL);
page = read_mapping_page(dir->i_mapping, index, NULL);
if (!IS_ERR(page)) {
wait_on_page_locked(page);
kmap(page);

11
fs/afs/mntpt.c
View File

@ -63,7 +63,6 @@ unsigned long afs_mntpt_expiry_timeout = 20;
int afs_mntpt_check_symlink(struct afs_vnode *vnode)
{
struct page *page;
filler_t *filler;
size_t size;
char *buf;
int ret;
@ -71,10 +70,7 @@ int afs_mntpt_check_symlink(struct afs_vnode *vnode)
_enter("{%u,%u}", vnode->fid.vnode, vnode->fid.unique);
/* read the contents of the symlink into the pagecache */
filler = (filler_t *) AFS_VNODE_TO_I(vnode)->i_mapping->a_ops->readpage;
page = read_cache_page(AFS_VNODE_TO_I(vnode)->i_mapping, 0,
filler, NULL);
page = read_mapping_page(AFS_VNODE_TO_I(vnode)->i_mapping, 0, NULL);
if (IS_ERR(page)) {
ret = PTR_ERR(page);
goto out;
@ -160,7 +156,6 @@ static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
struct page *page = NULL;
size_t size;
char *buf, *devname = NULL, *options = NULL;
filler_t *filler;
int ret;
kenter("{%s}", mntpt->d_name.name);
@ -182,9 +177,7 @@ static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
goto error;
/* read the contents of the AFS special symlink */
filler = (filler_t *)mntpt->d_inode->i_mapping->a_ops->readpage;
page = read_cache_page(mntpt->d_inode->i_mapping, 0, filler, NULL);
page = read_mapping_page(mntpt->d_inode->i_mapping, 0, NULL);
if (IS_ERR(page)) {
ret = PTR_ERR(page);
goto error;

4
fs/cramfs/inode.c
View File

@ -181,9 +181,7 @@ static void *cramfs_read(struct super_block *sb, unsigned int offset, unsigned i
struct page *page = NULL;
if (blocknr + i < devsize) {
page = read_cache_page(mapping, blocknr + i,
(filler_t *)mapping->a_ops->readpage,
NULL);
page = read_mapping_page(mapping, blocknr + i, NULL);
/* synchronous error? */
if (IS_ERR(page))
page = NULL;

3
fs/ext2/dir.c
View File

@ -159,8 +159,7 @@ fail:
static struct page * ext2_get_page(struct inode *dir, unsigned long n)
{
struct address_space *mapping = dir->i_mapping;
struct page *page = read_cache_page(mapping, n,
(filler_t*)mapping->a_ops->readpage, NULL);
struct page *page = read_mapping_page(mapping, n, NULL);
if (!IS_ERR(page)) {
wait_on_page_locked(page);
kmap(page);

3
fs/freevxfs/vxfs_subr.c
View File

@ -71,8 +71,7 @@ vxfs_get_page(struct address_space *mapping, u_long n)
{
struct page * pp;
pp = read_cache_page(mapping, n,
(filler_t*)mapping->a_ops->readpage, NULL);
pp = read_mapping_page(mapping, n, NULL);
if (!IS_ERR(pp)) {
wait_on_page_locked(pp);

2
fs/hfs/bnode.c
View File

@ -280,7 +280,7 @@ static struct hfs_bnode *__hfs_bnode_create(struct hfs_btree *tree, u32 cnid)
block = off >> PAGE_CACHE_SHIFT;
node->page_offset = off & ~PAGE_CACHE_MASK;
for (i = 0; i < tree->pages_per_bnode; i++) {
page = read_cache_page(mapping, block++, (filler_t *)mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, block++, NULL);
if (IS_ERR(page))
goto fail;
if (PageError(page)) {

2
fs/hfs/btree.c
View File

@ -59,7 +59,7 @@ struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id, btree_keycmp ke
unlock_new_inode(tree->inode);
mapping = tree->inode->i_mapping;
page = read_cache_page(mapping, 0, (filler_t *)mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, 0, NULL);
if (IS_ERR(page))
goto free_tree;

15
fs/hfsplus/bitmap.c
View File

@ -31,8 +31,7 @@ int hfsplus_block_allocate(struct super_block *sb, u32 size, u32 offset, u32 *ma
dprint(DBG_BITMAP, "block_allocate: %u,%u,%u\n", size, offset, len);
mutex_lock(&HFSPLUS_SB(sb).alloc_file->i_mutex);
mapping = HFSPLUS_SB(sb).alloc_file->i_mapping;
page = read_cache_page(mapping, offset / PAGE_CACHE_BITS,
(filler_t *)mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, offset / PAGE_CACHE_BITS, NULL);
pptr = kmap(page);
curr = pptr + (offset & (PAGE_CACHE_BITS - 1)) / 32;
i = offset % 32;
@ -72,8 +71,8 @@ int hfsplus_block_allocate(struct super_block *sb, u32 size, u32 offset, u32 *ma
offset += PAGE_CACHE_BITS;
if (offset >= size)
break;
page = read_cache_page(mapping, offset / PAGE_CACHE_BITS,
(filler_t *)mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, offset / PAGE_CACHE_BITS,
NULL);
curr = pptr = kmap(page);
if ((size ^ offset) / PAGE_CACHE_BITS)
end = pptr + PAGE_CACHE_BITS / 32;
@ -119,8 +118,8 @@ found:
set_page_dirty(page);
kunmap(page);
offset += PAGE_CACHE_BITS;
page = read_cache_page(mapping, offset / PAGE_CACHE_BITS,
(filler_t *)mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, offset / PAGE_CACHE_BITS,
NULL);
pptr = kmap(page);
curr = pptr;
end = pptr + PAGE_CACHE_BITS / 32;
@ -167,7 +166,7 @@ int hfsplus_block_free(struct super_block *sb, u32 offset, u32 count)
mutex_lock(&HFSPLUS_SB(sb).alloc_file->i_mutex);
mapping = HFSPLUS_SB(sb).alloc_file->i_mapping;
pnr = offset / PAGE_CACHE_BITS;
page = read_cache_page(mapping, pnr, (filler_t *)mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, pnr, NULL);
pptr = kmap(page);
curr = pptr + (offset & (PAGE_CACHE_BITS - 1)) / 32;
end = pptr + PAGE_CACHE_BITS / 32;
@ -199,7 +198,7 @@ int hfsplus_block_free(struct super_block *sb, u32 offset, u32 count)
break;
set_page_dirty(page);
kunmap(page);
page = read_cache_page(mapping, ++pnr, (filler_t *)mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, ++pnr, NULL);
pptr = kmap(page);
curr = pptr;
end = pptr + PAGE_CACHE_BITS / 32;

2
fs/hfsplus/bnode.c
View File

@ -440,7 +440,7 @@ static struct hfs_bnode *__hfs_bnode_create(struct hfs_btree *tree, u32 cnid)
block = off >> PAGE_CACHE_SHIFT;
node->page_offset = off & ~PAGE_CACHE_MASK;
for (i = 0; i < tree->pages_per_bnode; block++, i++) {
page = read_cache_page(mapping, block, (filler_t *)mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, block, NULL);
if (IS_ERR(page))
goto fail;
if (PageError(page)) {

2
fs/hfsplus/btree.c
View File

@ -38,7 +38,7 @@ struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id)
goto free_tree;
mapping = tree->inode->i_mapping;
page = read_cache_page(mapping, 0, (filler_t *)mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, 0, NULL);
if (IS_ERR(page))
goto free_tree;

5
fs/jfs/jfs_metapage.c
View File

@ -632,10 +632,9 @@ struct metapage *__get_metapage(struct inode *inode, unsigned long lblock,
}
SetPageUptodate(page);
} else {
page = read_cache_page(mapping, page_index,
(filler_t *)mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, page_index, NULL);
if (IS_ERR(page) || !PageUptodate(page)) {
jfs_err("read_cache_page failed!");
jfs_err("read_mapping_page failed!");
return NULL;
}
lock_page(page);

3
fs/minix/dir.c
View File

@ -60,8 +60,7 @@ static int dir_commit_chunk(struct page *page, unsigned from, unsigned to)
static struct page * dir_get_page(struct inode *dir, unsigned long n)
{
struct address_space *mapping = dir->i_mapping;
struct page *page = read_cache_page(mapping, n,
(filler_t*)mapping->a_ops->readpage, NULL);
struct page *page = read_mapping_page(mapping, n, NULL);
if (!IS_ERR(page)) {
wait_on_page_locked(page);
kmap(page);

3
fs/namei.c
View File

@ -2577,8 +2577,7 @@ static char *page_getlink(struct dentry * dentry, struct page **ppage)
{
struct page * page;
struct address_space *mapping = dentry->d_inode->i_mapping;
page = read_cache_page(mapping, 0, (filler_t *)mapping->a_ops->readpage,
NULL);
page = read_mapping_page(mapping, 0, NULL);
if (IS_ERR(page))
goto sync_fail;
wait_on_page_locked(page);

3
fs/ntfs/aops.h
View File

@ -86,8 +86,7 @@ static inline void ntfs_unmap_page(struct page *page)
static inline struct page *ntfs_map_page(struct address_space *mapping,
unsigned long index)
{
struct page *page = read_cache_page(mapping, index,
(filler_t*)mapping->a_ops->readpage, NULL);
struct page *page = read_mapping_page(mapping, index, NULL);
if (!IS_ERR(page)) {
wait_on_page_locked(page);

6
fs/ntfs/attrib.c
View File

@ -2529,8 +2529,7 @@ int ntfs_attr_set(ntfs_inode *ni, const s64 ofs, const s64 cnt, const u8 val)
end >>= PAGE_CACHE_SHIFT;
/* If there is a first partial page, need to do it the slow way. */
if (start_ofs) {
page = read_cache_page(mapping, idx,
(filler_t*)mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, idx, NULL);
if (IS_ERR(page)) {
ntfs_error(vol->sb, "Failed to read first partial "
"page (sync error, index 0x%lx).", idx);
@ -2600,8 +2599,7 @@ int ntfs_attr_set(ntfs_inode *ni, const s64 ofs, const s64 cnt, const u8 val)
}
/* If there is a last partial page, need to do it the slow way. */
if (end_ofs) {
page = read_cache_page(mapping, idx,
(filler_t*)mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, idx, NULL);
if (IS_ERR(page)) {
ntfs_error(vol->sb, "Failed to read last partial page "
"(sync error, index 0x%lx).", idx);

3
fs/ntfs/file.c
View File

@ -231,8 +231,7 @@ do_non_resident_extend:
* Read the page. If the page is not present, this will zero
* the uninitialized regions for us.
*/
page = read_cache_page(mapping, index,
(filler_t*)mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, index, NULL);
if (IS_ERR(page)) {
err = PTR_ERR(page);
goto init_err_out;

3
fs/ocfs2/symlink.c
View File

@ -64,8 +64,7 @@ static char *ocfs2_page_getlink(struct dentry * dentry,
{
struct page * page;
struct address_space *mapping = dentry->d_inode->i_mapping;
page = read_cache_page(mapping, 0,
(filler_t *)mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, 0, NULL);
if (IS_ERR(page))
goto sync_fail;
wait_on_page_locked(page);

4
fs/partitions/check.c
View File

@ -499,8 +499,8 @@ unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
struct address_space *mapping = bdev->bd_inode->i_mapping;
struct page *page;
page = read_cache_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
(filler_t *)mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
NULL);
if (!IS_ERR(page)) {
wait_on_page_locked(page);
if (!PageUptodate(page))

3
fs/reiserfs/xattr.c
View File

@ -452,8 +452,7 @@ static struct page *reiserfs_get_page(struct inode *dir, unsigned long n)
/* We can deadlock if we try to free dentries,
and an unlink/rmdir has just occured - GFP_NOFS avoids this */
mapping_set_gfp_mask(mapping, GFP_NOFS);
page = read_cache_page(mapping, n,
(filler_t *) mapping->a_ops->readpage, NULL);
page = read_mapping_page(mapping, n, NULL);
if (!IS_ERR(page)) {
wait_on_page_locked(page);
kmap(page);

3
fs/sysv/dir.c
View File

@ -53,8 +53,7 @@ static int dir_commit_chunk(struct page *page, unsigned from, unsigned to)
static struct page * dir_get_page(struct inode *dir, unsigned long n)
{
struct address_space *mapping = dir->i_mapping;
struct page *page = read_cache_page(mapping, n,
(filler_t*)mapping->a_ops->readpage, NULL);
struct page *page = read_mapping_page(mapping, n, NULL);
if (!IS_ERR(page)) {
wait_on_page_locked(page);
kmap(page);

7
include/linux/pagemap.h
View File

@ -99,6 +99,13 @@ extern struct page * read_cache_page(struct address_space *mapping,
extern int read_cache_pages(struct address_space *mapping,
struct list_head *pages, filler_t *filler, void *data);
static inline struct page *read_mapping_page(struct address_space *mapping,
unsigned long index, void *data)
{
filler_t *filler = (filler_t *)mapping->a_ops->readpage;
return read_cache_page(mapping, index, filler, data);
}
int add_to_page_cache(struct page *page, struct address_space *mapping,
unsigned long index, gfp_t gfp_mask);
int add_to_page_cache_lru(struct page *page, struct address_space *mapping,

3
mm/swapfile.c
View File

@ -1477,8 +1477,7 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags)
error = -EINVAL;
goto bad_swap;
}
page = read_cache_page(mapping, 0,
(filler_t *)mapping->a_ops->readpage, swap_file);
page = read_mapping_page(mapping, 0, swap_file);
if (IS_ERR(page)) {
error = PTR_ERR(page);
goto bad_swap;