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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 10:41:08 -0700
commit09cbfeaf1a5a67bfb3201e0c83c810cecb2efa5a (patch)
tree6cdf210c9c0f981cd22544feeba701892ec19464 /fs/ntfs/logfile.c
parentc05c2ec96bb8b7310da1055c7b9d786a3ec6dc0c (diff)
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/ntfs/logfile.c')
-rw-r--r--fs/ntfs/logfile.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/fs/ntfs/logfile.c b/fs/ntfs/logfile.c
index c71de292c5ad..9d71213ca81e 100644
--- a/fs/ntfs/logfile.c
+++ b/fs/ntfs/logfile.c
@@ -381,7 +381,7 @@ static int ntfs_check_and_load_restart_page(struct inode *vi,
* completely inside @rp, just copy it from there. Otherwise map all
* the required pages and copy the data from them.
*/
- size = PAGE_CACHE_SIZE - (pos & ~PAGE_CACHE_MASK);
+ size = PAGE_SIZE - (pos & ~PAGE_MASK);
if (size >= le32_to_cpu(rp->system_page_size)) {
memcpy(trp, rp, le32_to_cpu(rp->system_page_size));
} else {
@@ -394,8 +394,8 @@ static int ntfs_check_and_load_restart_page(struct inode *vi,
/* Copy the remaining data one page at a time. */
have_read = size;
to_read = le32_to_cpu(rp->system_page_size) - size;
- idx = (pos + size) >> PAGE_CACHE_SHIFT;
- BUG_ON((pos + size) & ~PAGE_CACHE_MASK);
+ idx = (pos + size) >> PAGE_SHIFT;
+ BUG_ON((pos + size) & ~PAGE_MASK);
do {
page = ntfs_map_page(vi->i_mapping, idx);
if (IS_ERR(page)) {
@@ -406,7 +406,7 @@ static int ntfs_check_and_load_restart_page(struct inode *vi,
err = -EIO;
goto err_out;
}
- size = min_t(int, to_read, PAGE_CACHE_SIZE);
+ size = min_t(int, to_read, PAGE_SIZE);
memcpy((u8*)trp + have_read, page_address(page), size);
ntfs_unmap_page(page);
have_read += size;
@@ -509,11 +509,11 @@ bool ntfs_check_logfile(struct inode *log_vi, RESTART_PAGE_HEADER **rp)
* log page size if the page cache size is between the default log page
* size and twice that.
*/
- if (PAGE_CACHE_SIZE >= DefaultLogPageSize && PAGE_CACHE_SIZE <=
+ if (PAGE_SIZE >= DefaultLogPageSize && PAGE_SIZE <=
DefaultLogPageSize * 2)
log_page_size = DefaultLogPageSize;
else
- log_page_size = PAGE_CACHE_SIZE;
+ log_page_size = PAGE_SIZE;
log_page_mask = log_page_size - 1;
/*
* Use ntfs_ffs() instead of ffs() to enable the compiler to
@@ -539,7 +539,7 @@ bool ntfs_check_logfile(struct inode *log_vi, RESTART_PAGE_HEADER **rp)
* to be empty.
*/
for (pos = 0; pos < size; pos <<= 1) {
- pgoff_t idx = pos >> PAGE_CACHE_SHIFT;
+ pgoff_t idx = pos >> PAGE_SHIFT;
if (!page || page->index != idx) {
if (page)
ntfs_unmap_page(page);
@@ -550,7 +550,7 @@ bool ntfs_check_logfile(struct inode *log_vi, RESTART_PAGE_HEADER **rp)
goto err_out;
}
}
- kaddr = (u8*)page_address(page) + (pos & ~PAGE_CACHE_MASK);
+ kaddr = (u8*)page_address(page) + (pos & ~PAGE_MASK);
/*
* A non-empty block means the logfile is not empty while an
* empty block after a non-empty block has been encountered