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>

1 files changed, 7 insertions, 7 deletions

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index c18ab45f8d21..5308841756be 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -770,14 +770,14 @@ static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
 {
         struct address_space *mapping = inode->i_mapping;
         struct page *page;
-        unsigned long index = abs_from >> PAGE_CACHE_SHIFT;
+        unsigned long index = abs_from >> PAGE_SHIFT;
         handle_t *handle;
         int ret = 0;
         unsigned zero_from, zero_to, block_start, block_end;
         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
 
         BUG_ON(abs_from >= abs_to);
-        BUG_ON(abs_to > (((u64)index + 1) << PAGE_CACHE_SHIFT));
+        BUG_ON(abs_to > (((u64)index + 1) << PAGE_SHIFT));
         BUG_ON(abs_from & (inode->i_blkbits - 1));
 
         handle = ocfs2_zero_start_ordered_transaction(inode, di_bh);
@@ -794,10 +794,10 @@ static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
         }
 
         /* Get the offsets within the page that we want to zero */
-        zero_from = abs_from & (PAGE_CACHE_SIZE - 1);
-        zero_to = abs_to & (PAGE_CACHE_SIZE - 1);
+        zero_from = abs_from & (PAGE_SIZE - 1);
+        zero_to = abs_to & (PAGE_SIZE - 1);
         if (!zero_to)
-                zero_to = PAGE_CACHE_SIZE;
+                zero_to = PAGE_SIZE;
 
         trace_ocfs2_write_zero_page(
                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
@@ -851,7 +851,7 @@ static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
 
 out_unlock:
         unlock_page(page);
-        page_cache_release(page);
+        put_page(page);
 out_commit_trans:
         if (handle)
                 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
@@ -959,7 +959,7 @@ static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start,
         BUG_ON(range_start >= range_end);
 
         while (zero_pos < range_end) {
-                next_pos = (zero_pos & PAGE_CACHE_MASK) + PAGE_CACHE_SIZE;
+                next_pos = (zero_pos & PAGE_MASK) + PAGE_SIZE;
                 if (next_pos > range_end)
                         next_pos = range_end;
                 rc = ocfs2_write_zero_page(inode, zero_pos, next_pos, di_bh);