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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2016-04-01 15:29:47 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-04-04 20:41:08 +0300
commit09cbfeaf1a5a67bfb3201e0c83c810cecb2efa5a (patch)
tree6cdf210c9c0f981cd22544feeba701892ec19464 /fs/ufs/dir.c
parentc05c2ec96bb8b7310da1055c7b9d786a3ec6dc0c (diff)
downloadlinux-09cbfeaf1a5a67bfb3201e0c83c810cecb2efa5a.tar.xz
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
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>
Diffstat (limited to 'fs/ufs/dir.c')
-rw-r--r--fs/ufs/dir.c32
1 files changed, 16 insertions, 16 deletions
diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
index 74f2e80288bf..0b1457292734 100644
--- a/fs/ufs/dir.c
+++ b/fs/ufs/dir.c
@@ -62,7 +62,7 @@ static int ufs_commit_chunk(struct page *page, loff_t pos, unsigned len)
static inline void ufs_put_page(struct page *page)
{
kunmap(page);
- page_cache_release(page);
+ put_page(page);
}
ino_t ufs_inode_by_name(struct inode *dir, const struct qstr *qstr)
@@ -111,13 +111,13 @@ static void ufs_check_page(struct page *page)
struct super_block *sb = dir->i_sb;
char *kaddr = page_address(page);
unsigned offs, rec_len;
- unsigned limit = PAGE_CACHE_SIZE;
+ unsigned limit = PAGE_SIZE;
const unsigned chunk_mask = UFS_SB(sb)->s_uspi->s_dirblksize - 1;
struct ufs_dir_entry *p;
char *error;
- if ((dir->i_size >> PAGE_CACHE_SHIFT) == page->index) {
- limit = dir->i_size & ~PAGE_CACHE_MASK;
+ if ((dir->i_size >> PAGE_SHIFT) == page->index) {
+ limit = dir->i_size & ~PAGE_MASK;
if (limit & chunk_mask)
goto Ebadsize;
if (!limit)
@@ -170,7 +170,7 @@ Einumber:
bad_entry:
ufs_error (sb, "ufs_check_page", "bad entry in directory #%lu: %s - "
"offset=%lu, rec_len=%d, name_len=%d",
- dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT)+offs,
+ dir->i_ino, error, (page->index<<PAGE_SHIFT)+offs,
rec_len, ufs_get_de_namlen(sb, p));
goto fail;
Eend:
@@ -178,7 +178,7 @@ Eend:
ufs_error(sb, __func__,
"entry in directory #%lu spans the page boundary"
"offset=%lu",
- dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs);
+ dir->i_ino, (page->index<<PAGE_SHIFT)+offs);
fail:
SetPageChecked(page);
SetPageError(page);
@@ -211,9 +211,9 @@ ufs_last_byte(struct inode *inode, unsigned long page_nr)
{
unsigned last_byte = inode->i_size;
- last_byte -= page_nr << PAGE_CACHE_SHIFT;
- if (last_byte > PAGE_CACHE_SIZE)
- last_byte = PAGE_CACHE_SIZE;
+ last_byte -= page_nr << PAGE_SHIFT;
+ if (last_byte > PAGE_SIZE)
+ last_byte = PAGE_SIZE;
return last_byte;
}
@@ -341,7 +341,7 @@ int ufs_add_link(struct dentry *dentry, struct inode *inode)
kaddr = page_address(page);
dir_end = kaddr + ufs_last_byte(dir, n);
de = (struct ufs_dir_entry *)kaddr;
- kaddr += PAGE_CACHE_SIZE - reclen;
+ kaddr += PAGE_SIZE - reclen;
while ((char *)de <= kaddr) {
if ((char *)de == dir_end) {
/* We hit i_size */
@@ -432,8 +432,8 @@ ufs_readdir(struct file *file, struct dir_context *ctx)
loff_t pos = ctx->pos;
struct inode *inode = file_inode(file);
struct super_block *sb = inode->i_sb;
- unsigned int offset = pos & ~PAGE_CACHE_MASK;
- unsigned long n = pos >> PAGE_CACHE_SHIFT;
+ unsigned int offset = pos & ~PAGE_MASK;
+ unsigned long n = pos >> PAGE_SHIFT;
unsigned long npages = dir_pages(inode);
unsigned chunk_mask = ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
int need_revalidate = file->f_version != inode->i_version;
@@ -454,14 +454,14 @@ ufs_readdir(struct file *file, struct dir_context *ctx)
ufs_error(sb, __func__,
"bad page in #%lu",
inode->i_ino);
- ctx->pos += PAGE_CACHE_SIZE - offset;
+ ctx->pos += PAGE_SIZE - offset;
return -EIO;
}
kaddr = page_address(page);
if (unlikely(need_revalidate)) {
if (offset) {
offset = ufs_validate_entry(sb, kaddr, offset, chunk_mask);
- ctx->pos = (n<<PAGE_CACHE_SHIFT) + offset;
+ ctx->pos = (n<<PAGE_SHIFT) + offset;
}
file->f_version = inode->i_version;
need_revalidate = 0;
@@ -574,7 +574,7 @@ int ufs_make_empty(struct inode * inode, struct inode *dir)
kmap(page);
base = (char*)page_address(page);
- memset(base, 0, PAGE_CACHE_SIZE);
+ memset(base, 0, PAGE_SIZE);
de = (struct ufs_dir_entry *) base;
@@ -594,7 +594,7 @@ int ufs_make_empty(struct inode * inode, struct inode *dir)
err = ufs_commit_chunk(page, 0, chunk_size);
fail:
- page_cache_release(page);
+ put_page(page);
return err;
}