forked from Minki/linux
09cbfeaf1a
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>
290 lines
6.4 KiB
C
290 lines
6.4 KiB
C
/**
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* @file oprofilefs.c
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*
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* @remark Copyright 2002 OProfile authors
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* @remark Read the file COPYING
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*
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* @author John Levon
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*
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* A simple filesystem for configuration and
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* access of oprofile.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/oprofile.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <asm/uaccess.h>
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#include "oprof.h"
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#define OPROFILEFS_MAGIC 0x6f70726f
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DEFINE_RAW_SPINLOCK(oprofilefs_lock);
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static struct inode *oprofilefs_get_inode(struct super_block *sb, int mode)
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{
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struct inode *inode = new_inode(sb);
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if (inode) {
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inode->i_ino = get_next_ino();
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inode->i_mode = mode;
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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}
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return inode;
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}
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static const struct super_operations s_ops = {
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.statfs = simple_statfs,
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.drop_inode = generic_delete_inode,
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};
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ssize_t oprofilefs_str_to_user(char const *str, char __user *buf, size_t count, loff_t *offset)
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{
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return simple_read_from_buffer(buf, count, offset, str, strlen(str));
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}
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#define TMPBUFSIZE 50
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ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user *buf, size_t count, loff_t *offset)
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{
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char tmpbuf[TMPBUFSIZE];
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size_t maxlen = snprintf(tmpbuf, TMPBUFSIZE, "%lu\n", val);
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if (maxlen > TMPBUFSIZE)
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maxlen = TMPBUFSIZE;
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return simple_read_from_buffer(buf, count, offset, tmpbuf, maxlen);
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}
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/*
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* Note: If oprofilefs_ulong_from_user() returns 0, then *val remains
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* unchanged and might be uninitialized. This follows write syscall
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* implementation when count is zero: "If count is zero ... [and if]
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* no errors are detected, 0 will be returned without causing any
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* other effect." (man 2 write)
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*/
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int oprofilefs_ulong_from_user(unsigned long *val, char const __user *buf, size_t count)
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{
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char tmpbuf[TMPBUFSIZE];
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unsigned long flags;
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if (!count)
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return 0;
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if (count > TMPBUFSIZE - 1)
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return -EINVAL;
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memset(tmpbuf, 0x0, TMPBUFSIZE);
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if (copy_from_user(tmpbuf, buf, count))
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return -EFAULT;
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raw_spin_lock_irqsave(&oprofilefs_lock, flags);
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*val = simple_strtoul(tmpbuf, NULL, 0);
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raw_spin_unlock_irqrestore(&oprofilefs_lock, flags);
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return count;
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}
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static ssize_t ulong_read_file(struct file *file, char __user *buf, size_t count, loff_t *offset)
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{
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unsigned long *val = file->private_data;
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return oprofilefs_ulong_to_user(*val, buf, count, offset);
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}
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static ssize_t ulong_write_file(struct file *file, char const __user *buf, size_t count, loff_t *offset)
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{
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unsigned long value;
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int retval;
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if (*offset)
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return -EINVAL;
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retval = oprofilefs_ulong_from_user(&value, buf, count);
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if (retval <= 0)
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return retval;
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retval = oprofile_set_ulong(file->private_data, value);
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if (retval)
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return retval;
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return count;
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}
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static const struct file_operations ulong_fops = {
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.read = ulong_read_file,
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.write = ulong_write_file,
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.open = simple_open,
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.llseek = default_llseek,
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};
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static const struct file_operations ulong_ro_fops = {
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.read = ulong_read_file,
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.open = simple_open,
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.llseek = default_llseek,
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};
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static int __oprofilefs_create_file(struct dentry *root, char const *name,
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const struct file_operations *fops, int perm, void *priv)
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{
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struct dentry *dentry;
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struct inode *inode;
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inode_lock(d_inode(root));
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dentry = d_alloc_name(root, name);
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if (!dentry) {
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inode_unlock(d_inode(root));
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return -ENOMEM;
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}
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inode = oprofilefs_get_inode(root->d_sb, S_IFREG | perm);
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if (!inode) {
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dput(dentry);
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inode_unlock(d_inode(root));
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return -ENOMEM;
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}
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inode->i_fop = fops;
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inode->i_private = priv;
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d_add(dentry, inode);
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inode_unlock(d_inode(root));
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return 0;
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}
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int oprofilefs_create_ulong(struct dentry *root,
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char const *name, unsigned long *val)
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{
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return __oprofilefs_create_file(root, name,
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&ulong_fops, 0644, val);
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}
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int oprofilefs_create_ro_ulong(struct dentry *root,
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char const *name, unsigned long *val)
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{
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return __oprofilefs_create_file(root, name,
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&ulong_ro_fops, 0444, val);
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}
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static ssize_t atomic_read_file(struct file *file, char __user *buf, size_t count, loff_t *offset)
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{
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atomic_t *val = file->private_data;
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return oprofilefs_ulong_to_user(atomic_read(val), buf, count, offset);
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}
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static const struct file_operations atomic_ro_fops = {
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.read = atomic_read_file,
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.open = simple_open,
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.llseek = default_llseek,
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};
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int oprofilefs_create_ro_atomic(struct dentry *root,
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char const *name, atomic_t *val)
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{
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return __oprofilefs_create_file(root, name,
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&atomic_ro_fops, 0444, val);
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}
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int oprofilefs_create_file(struct dentry *root,
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char const *name, const struct file_operations *fops)
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{
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return __oprofilefs_create_file(root, name, fops, 0644, NULL);
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}
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int oprofilefs_create_file_perm(struct dentry *root,
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char const *name, const struct file_operations *fops, int perm)
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{
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return __oprofilefs_create_file(root, name, fops, perm, NULL);
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}
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struct dentry *oprofilefs_mkdir(struct dentry *parent, char const *name)
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{
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struct dentry *dentry;
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struct inode *inode;
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inode_lock(d_inode(parent));
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dentry = d_alloc_name(parent, name);
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if (!dentry) {
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inode_unlock(d_inode(parent));
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return NULL;
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}
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inode = oprofilefs_get_inode(parent->d_sb, S_IFDIR | 0755);
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if (!inode) {
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dput(dentry);
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inode_unlock(d_inode(parent));
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return NULL;
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}
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inode->i_op = &simple_dir_inode_operations;
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inode->i_fop = &simple_dir_operations;
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d_add(dentry, inode);
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inode_unlock(d_inode(parent));
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return dentry;
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}
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static int oprofilefs_fill_super(struct super_block *sb, void *data, int silent)
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{
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struct inode *root_inode;
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sb->s_blocksize = PAGE_SIZE;
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sb->s_blocksize_bits = PAGE_SHIFT;
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sb->s_magic = OPROFILEFS_MAGIC;
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sb->s_op = &s_ops;
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sb->s_time_gran = 1;
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root_inode = oprofilefs_get_inode(sb, S_IFDIR | 0755);
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if (!root_inode)
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return -ENOMEM;
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root_inode->i_op = &simple_dir_inode_operations;
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root_inode->i_fop = &simple_dir_operations;
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sb->s_root = d_make_root(root_inode);
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if (!sb->s_root)
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return -ENOMEM;
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oprofile_create_files(sb->s_root);
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// FIXME: verify kill_litter_super removes our dentries
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return 0;
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}
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static struct dentry *oprofilefs_mount(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data)
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{
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return mount_single(fs_type, flags, data, oprofilefs_fill_super);
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}
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static struct file_system_type oprofilefs_type = {
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.owner = THIS_MODULE,
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.name = "oprofilefs",
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.mount = oprofilefs_mount,
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.kill_sb = kill_litter_super,
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};
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MODULE_ALIAS_FS("oprofilefs");
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int __init oprofilefs_register(void)
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{
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return register_filesystem(&oprofilefs_type);
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}
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void __exit oprofilefs_unregister(void)
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{
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unregister_filesystem(&oprofilefs_type);
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}
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