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Subject[15/36] Use page_cache_xxx functions in fs/ext2
Use page_cache_xxx functions in fs/ext2

Signed-off-by: Christoph Lameter <clameter@sgi.com>
---
fs/ext2/dir.c | 40 +++++++++++++++++++++++-----------------
1 files changed, 23 insertions(+), 17 deletions(-)
diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c
index 2bf49d7..d72926f 100644
--- a/fs/ext2/dir.c
+++ b/fs/ext2/dir.c
@@ -43,7 +43,8 @@ static inline void ext2_put_page(struct page *page)

static inline unsigned long dir_pages(struct inode *inode)
{
- return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
+ return (inode->i_size+page_cache_size(inode->i_mapping)-1)>>
+ page_cache_shift(inode->i_mapping);
}

/*
@@ -54,10 +55,11 @@ static unsigned
ext2_last_byte(struct inode *inode, unsigned long page_nr)
{
unsigned last_byte = inode->i_size;
+ struct address_space *mapping = inode->i_mapping;

- last_byte -= page_nr << PAGE_CACHE_SHIFT;
- if (last_byte > PAGE_CACHE_SIZE)
- last_byte = PAGE_CACHE_SIZE;
+ last_byte -= page_nr << page_cache_shift(mapping);
+ if (last_byte > page_cache_size(mapping))
+ last_byte = page_cache_size(mapping);
return last_byte;
}

@@ -76,18 +78,19 @@ static int ext2_commit_chunk(struct page *page, unsigned from, unsigned to)

static void ext2_check_page(struct page *page)
{
- struct inode *dir = page->mapping->host;
+ struct address_space *mapping = page->mapping;
+ struct inode *dir = mapping->host;
struct super_block *sb = dir->i_sb;
unsigned chunk_size = ext2_chunk_size(dir);
char *kaddr = page_address(page);
u32 max_inumber = le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count);
unsigned offs, rec_len;
- unsigned limit = PAGE_CACHE_SIZE;
+ unsigned limit = page_cache_size(mapping);
ext2_dirent *p;
char *error;

- if ((dir->i_size >> PAGE_CACHE_SHIFT) == page->index) {
- limit = dir->i_size & ~PAGE_CACHE_MASK;
+ if (page_cache_index(mapping, dir->i_size) == page->index) {
+ limit = page_cache_offset(mapping, dir->i_size);
if (limit & (chunk_size - 1))
goto Ebadsize;
if (!limit)
@@ -139,7 +142,7 @@ Einumber:
bad_entry:
ext2_error (sb, "ext2_check_page", "bad entry in directory #%lu: %s - "
"offset=%lu, inode=%lu, rec_len=%d, name_len=%d",
- dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT)+offs,
+ dir->i_ino, error, page_cache_pos(mapping, page->index, offs),
(unsigned long) le32_to_cpu(p->inode),
rec_len, p->name_len);
goto fail;
@@ -148,7 +151,7 @@ Eend:
ext2_error (sb, "ext2_check_page",
"entry in directory #%lu spans the page boundary"
"offset=%lu, inode=%lu",
- dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs,
+ dir->i_ino, page_cache_pos(mapping, page->index, offs),
(unsigned long) le32_to_cpu(p->inode));
fail:
SetPageChecked(page);
@@ -246,8 +249,9 @@ ext2_readdir (struct file * filp, void * dirent, filldir_t filldir)
loff_t pos = filp->f_pos;
struct inode *inode = filp->f_path.dentry->d_inode;
struct super_block *sb = inode->i_sb;
- unsigned int offset = pos & ~PAGE_CACHE_MASK;
- unsigned long n = pos >> PAGE_CACHE_SHIFT;
+ struct address_space *mapping = inode->i_mapping;
+ unsigned int offset = page_cache_offset(mapping, pos);
+ unsigned long n = page_cache_index(mapping, pos);
unsigned long npages = dir_pages(inode);
unsigned chunk_mask = ~(ext2_chunk_size(inode)-1);
unsigned char *types = NULL;
@@ -268,14 +272,14 @@ ext2_readdir (struct file * filp, void * dirent, filldir_t filldir)
ext2_error(sb, __FUNCTION__,
"bad page in #%lu",
inode->i_ino);
- filp->f_pos += PAGE_CACHE_SIZE - offset;
+ filp->f_pos += page_cache_size(mapping) - offset;
return -EIO;
}
kaddr = page_address(page);
if (unlikely(need_revalidate)) {
if (offset) {
offset = ext2_validate_entry(kaddr, offset, chunk_mask);
- filp->f_pos = (n<<PAGE_CACHE_SHIFT) + offset;
+ filp->f_pos = page_cache_pos(mapping, n, offset);
}
filp->f_version = inode->i_version;
need_revalidate = 0;
@@ -298,7 +302,7 @@ ext2_readdir (struct file * filp, void * dirent, filldir_t filldir)

offset = (char *)de - kaddr;
over = filldir(dirent, de->name, de->name_len,
- (n<<PAGE_CACHE_SHIFT) | offset,
+ page_cache_pos(mapping, n, offset),
le32_to_cpu(de->inode), d_type);
if (over) {
ext2_put_page(page);
@@ -324,6 +328,7 @@ struct ext2_dir_entry_2 * ext2_find_entry (struct inode * dir,
struct dentry *dentry, struct page ** res_page)
{
const char *name = dentry->d_name.name;
+ struct address_space *mapping = dir->i_mapping;
int namelen = dentry->d_name.len;
unsigned reclen = EXT2_DIR_REC_LEN(namelen);
unsigned long start, n;
@@ -365,7 +370,7 @@ struct ext2_dir_entry_2 * ext2_find_entry (struct inode * dir,
if (++n >= npages)
n = 0;
/* next page is past the blocks we've got */
- if (unlikely(n > (dir->i_blocks >> (PAGE_CACHE_SHIFT - 9)))) {
+ if (unlikely(n > (dir->i_blocks >> (page_cache_shift(mapping) - 9)))) {
ext2_error(dir->i_sb, __FUNCTION__,
"dir %lu size %lld exceeds block count %llu",
dir->i_ino, dir->i_size,
@@ -434,6 +439,7 @@ void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
int ext2_add_link (struct dentry *dentry, struct inode *inode)
{
struct inode *dir = dentry->d_parent->d_inode;
+ struct address_space *mapping = inode->i_mapping;
const char *name = dentry->d_name.name;
int namelen = dentry->d_name.len;
unsigned chunk_size = ext2_chunk_size(dir);
@@ -463,7 +469,7 @@ int ext2_add_link (struct dentry *dentry, struct inode *inode)
kaddr = page_address(page);
dir_end = kaddr + ext2_last_byte(dir, n);
de = (ext2_dirent *)kaddr;
- kaddr += PAGE_CACHE_SIZE - reclen;
+ kaddr += page_cache_size(mapping) - reclen;
while ((char *)de <= kaddr) {
if ((char *)de == dir_end) {
/* We hit i_size */
--
1.5.2.4
--
-
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