mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
![Kirill A. Shutemov](/assets/img/avatar_default.png)
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>
337 lines
7.2 KiB
C
337 lines
7.2 KiB
C
/*
|
|
* linux/fs/ufs/namei.c
|
|
*
|
|
* Migration to usage of "page cache" on May 2006 by
|
|
* Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base.
|
|
*
|
|
* Copyright (C) 1998
|
|
* Daniel Pirkl <daniel.pirkl@email.cz>
|
|
* Charles University, Faculty of Mathematics and Physics
|
|
*
|
|
* from
|
|
*
|
|
* linux/fs/ext2/namei.c
|
|
*
|
|
* Copyright (C) 1992, 1993, 1994, 1995
|
|
* Remy Card (card@masi.ibp.fr)
|
|
* Laboratoire MASI - Institut Blaise Pascal
|
|
* Universite Pierre et Marie Curie (Paris VI)
|
|
*
|
|
* from
|
|
*
|
|
* linux/fs/minix/namei.c
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*
|
|
* Big-endian to little-endian byte-swapping/bitmaps by
|
|
* David S. Miller (davem@caip.rutgers.edu), 1995
|
|
*/
|
|
|
|
#include <linux/time.h>
|
|
#include <linux/fs.h>
|
|
|
|
#include "ufs_fs.h"
|
|
#include "ufs.h"
|
|
#include "util.h"
|
|
|
|
static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode)
|
|
{
|
|
int err = ufs_add_link(dentry, inode);
|
|
if (!err) {
|
|
unlock_new_inode(inode);
|
|
d_instantiate(dentry, inode);
|
|
return 0;
|
|
}
|
|
inode_dec_link_count(inode);
|
|
unlock_new_inode(inode);
|
|
iput(inode);
|
|
return err;
|
|
}
|
|
|
|
static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
|
|
{
|
|
struct inode * inode = NULL;
|
|
ino_t ino;
|
|
|
|
if (dentry->d_name.len > UFS_MAXNAMLEN)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
ino = ufs_inode_by_name(dir, &dentry->d_name);
|
|
if (ino)
|
|
inode = ufs_iget(dir->i_sb, ino);
|
|
return d_splice_alias(inode, dentry);
|
|
}
|
|
|
|
/*
|
|
* By the time this is called, we already have created
|
|
* the directory cache entry for the new file, but it
|
|
* is so far negative - it has no inode.
|
|
*
|
|
* If the create succeeds, we fill in the inode information
|
|
* with d_instantiate().
|
|
*/
|
|
static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode,
|
|
bool excl)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = ufs_new_inode(dir, mode);
|
|
if (IS_ERR(inode))
|
|
return PTR_ERR(inode);
|
|
|
|
inode->i_op = &ufs_file_inode_operations;
|
|
inode->i_fop = &ufs_file_operations;
|
|
inode->i_mapping->a_ops = &ufs_aops;
|
|
mark_inode_dirty(inode);
|
|
return ufs_add_nondir(dentry, inode);
|
|
}
|
|
|
|
static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
|
|
{
|
|
struct inode *inode;
|
|
int err;
|
|
|
|
if (!old_valid_dev(rdev))
|
|
return -EINVAL;
|
|
|
|
inode = ufs_new_inode(dir, mode);
|
|
err = PTR_ERR(inode);
|
|
if (!IS_ERR(inode)) {
|
|
init_special_inode(inode, mode, rdev);
|
|
ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
|
|
mark_inode_dirty(inode);
|
|
err = ufs_add_nondir(dentry, inode);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int ufs_symlink (struct inode * dir, struct dentry * dentry,
|
|
const char * symname)
|
|
{
|
|
struct super_block * sb = dir->i_sb;
|
|
int err;
|
|
unsigned l = strlen(symname)+1;
|
|
struct inode * inode;
|
|
|
|
if (l > sb->s_blocksize)
|
|
return -ENAMETOOLONG;
|
|
|
|
inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
|
|
err = PTR_ERR(inode);
|
|
if (IS_ERR(inode))
|
|
return err;
|
|
|
|
if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
|
|
/* slow symlink */
|
|
inode->i_op = &page_symlink_inode_operations;
|
|
inode_nohighmem(inode);
|
|
inode->i_mapping->a_ops = &ufs_aops;
|
|
err = page_symlink(inode, symname, l);
|
|
if (err)
|
|
goto out_fail;
|
|
} else {
|
|
/* fast symlink */
|
|
inode->i_op = &simple_symlink_inode_operations;
|
|
inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
|
|
memcpy(inode->i_link, symname, l);
|
|
inode->i_size = l-1;
|
|
}
|
|
mark_inode_dirty(inode);
|
|
|
|
return ufs_add_nondir(dentry, inode);
|
|
|
|
out_fail:
|
|
inode_dec_link_count(inode);
|
|
unlock_new_inode(inode);
|
|
iput(inode);
|
|
return err;
|
|
}
|
|
|
|
static int ufs_link (struct dentry * old_dentry, struct inode * dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct inode *inode = d_inode(old_dentry);
|
|
int error;
|
|
|
|
inode->i_ctime = CURRENT_TIME_SEC;
|
|
inode_inc_link_count(inode);
|
|
ihold(inode);
|
|
|
|
error = ufs_add_link(dentry, inode);
|
|
if (error) {
|
|
inode_dec_link_count(inode);
|
|
iput(inode);
|
|
} else
|
|
d_instantiate(dentry, inode);
|
|
return error;
|
|
}
|
|
|
|
static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
|
|
{
|
|
struct inode * inode;
|
|
int err;
|
|
|
|
inode_inc_link_count(dir);
|
|
|
|
inode = ufs_new_inode(dir, S_IFDIR|mode);
|
|
err = PTR_ERR(inode);
|
|
if (IS_ERR(inode))
|
|
goto out_dir;
|
|
|
|
inode->i_op = &ufs_dir_inode_operations;
|
|
inode->i_fop = &ufs_dir_operations;
|
|
inode->i_mapping->a_ops = &ufs_aops;
|
|
|
|
inode_inc_link_count(inode);
|
|
|
|
err = ufs_make_empty(inode, dir);
|
|
if (err)
|
|
goto out_fail;
|
|
|
|
err = ufs_add_link(dentry, inode);
|
|
if (err)
|
|
goto out_fail;
|
|
|
|
unlock_new_inode(inode);
|
|
d_instantiate(dentry, inode);
|
|
return 0;
|
|
|
|
out_fail:
|
|
inode_dec_link_count(inode);
|
|
inode_dec_link_count(inode);
|
|
unlock_new_inode(inode);
|
|
iput (inode);
|
|
out_dir:
|
|
inode_dec_link_count(dir);
|
|
return err;
|
|
}
|
|
|
|
static int ufs_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct inode * inode = d_inode(dentry);
|
|
struct ufs_dir_entry *de;
|
|
struct page *page;
|
|
int err = -ENOENT;
|
|
|
|
de = ufs_find_entry(dir, &dentry->d_name, &page);
|
|
if (!de)
|
|
goto out;
|
|
|
|
err = ufs_delete_entry(dir, de, page);
|
|
if (err)
|
|
goto out;
|
|
|
|
inode->i_ctime = dir->i_ctime;
|
|
inode_dec_link_count(inode);
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
|
|
{
|
|
struct inode * inode = d_inode(dentry);
|
|
int err= -ENOTEMPTY;
|
|
|
|
if (ufs_empty_dir (inode)) {
|
|
err = ufs_unlink(dir, dentry);
|
|
if (!err) {
|
|
inode->i_size = 0;
|
|
inode_dec_link_count(inode);
|
|
inode_dec_link_count(dir);
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry)
|
|
{
|
|
struct inode *old_inode = d_inode(old_dentry);
|
|
struct inode *new_inode = d_inode(new_dentry);
|
|
struct page *dir_page = NULL;
|
|
struct ufs_dir_entry * dir_de = NULL;
|
|
struct page *old_page;
|
|
struct ufs_dir_entry *old_de;
|
|
int err = -ENOENT;
|
|
|
|
old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
|
|
if (!old_de)
|
|
goto out;
|
|
|
|
if (S_ISDIR(old_inode->i_mode)) {
|
|
err = -EIO;
|
|
dir_de = ufs_dotdot(old_inode, &dir_page);
|
|
if (!dir_de)
|
|
goto out_old;
|
|
}
|
|
|
|
if (new_inode) {
|
|
struct page *new_page;
|
|
struct ufs_dir_entry *new_de;
|
|
|
|
err = -ENOTEMPTY;
|
|
if (dir_de && !ufs_empty_dir(new_inode))
|
|
goto out_dir;
|
|
|
|
err = -ENOENT;
|
|
new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
|
|
if (!new_de)
|
|
goto out_dir;
|
|
ufs_set_link(new_dir, new_de, new_page, old_inode, 1);
|
|
new_inode->i_ctime = CURRENT_TIME_SEC;
|
|
if (dir_de)
|
|
drop_nlink(new_inode);
|
|
inode_dec_link_count(new_inode);
|
|
} else {
|
|
err = ufs_add_link(new_dentry, old_inode);
|
|
if (err)
|
|
goto out_dir;
|
|
if (dir_de)
|
|
inode_inc_link_count(new_dir);
|
|
}
|
|
|
|
/*
|
|
* Like most other Unix systems, set the ctime for inodes on a
|
|
* rename.
|
|
*/
|
|
old_inode->i_ctime = CURRENT_TIME_SEC;
|
|
|
|
ufs_delete_entry(old_dir, old_de, old_page);
|
|
mark_inode_dirty(old_inode);
|
|
|
|
if (dir_de) {
|
|
if (old_dir != new_dir)
|
|
ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0);
|
|
else {
|
|
kunmap(dir_page);
|
|
put_page(dir_page);
|
|
}
|
|
inode_dec_link_count(old_dir);
|
|
}
|
|
return 0;
|
|
|
|
|
|
out_dir:
|
|
if (dir_de) {
|
|
kunmap(dir_page);
|
|
put_page(dir_page);
|
|
}
|
|
out_old:
|
|
kunmap(old_page);
|
|
put_page(old_page);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
const struct inode_operations ufs_dir_inode_operations = {
|
|
.create = ufs_create,
|
|
.lookup = ufs_lookup,
|
|
.link = ufs_link,
|
|
.unlink = ufs_unlink,
|
|
.symlink = ufs_symlink,
|
|
.mkdir = ufs_mkdir,
|
|
.rmdir = ufs_rmdir,
|
|
.mknod = ufs_mknod,
|
|
.rename = ufs_rename,
|
|
};
|