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![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>
366 lines
8.6 KiB
C
366 lines
8.6 KiB
C
/*
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* linux/fs/9p/vfs_super.c
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*
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* This file contians superblock ops for 9P2000. It is intended that
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* you mount this file system on directories.
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*
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/inet.h>
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#include <linux/pagemap.h>
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#include <linux/seq_file.h>
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#include <linux/mount.h>
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#include <linux/idr.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/statfs.h>
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#include <linux/magic.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include "v9fs.h"
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#include "v9fs_vfs.h"
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#include "fid.h"
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#include "xattr.h"
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#include "acl.h"
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static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl;
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/**
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* v9fs_set_super - set the superblock
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* @s: super block
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* @data: file system specific data
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*
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*/
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static int v9fs_set_super(struct super_block *s, void *data)
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{
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s->s_fs_info = data;
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return set_anon_super(s, data);
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}
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/**
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* v9fs_fill_super - populate superblock with info
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* @sb: superblock
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* @v9ses: session information
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* @flags: flags propagated from v9fs_mount()
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*
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*/
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static void
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v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
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int flags, void *data)
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{
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
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sb->s_blocksize = 1 << sb->s_blocksize_bits;
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sb->s_magic = V9FS_MAGIC;
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if (v9fs_proto_dotl(v9ses)) {
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sb->s_op = &v9fs_super_ops_dotl;
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sb->s_xattr = v9fs_xattr_handlers;
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} else
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sb->s_op = &v9fs_super_ops;
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sb->s_bdi = &v9ses->bdi;
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if (v9ses->cache)
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sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024)/PAGE_SIZE;
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sb->s_flags |= MS_ACTIVE | MS_DIRSYNC | MS_NOATIME;
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if (!v9ses->cache)
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sb->s_flags |= MS_SYNCHRONOUS;
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#ifdef CONFIG_9P_FS_POSIX_ACL
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if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL)
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sb->s_flags |= MS_POSIXACL;
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#endif
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save_mount_options(sb, data);
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}
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/**
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* v9fs_mount - mount a superblock
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* @fs_type: file system type
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* @flags: mount flags
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* @dev_name: device name that was mounted
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* @data: mount options
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*
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*/
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static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
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const char *dev_name, void *data)
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{
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struct super_block *sb = NULL;
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struct inode *inode = NULL;
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struct dentry *root = NULL;
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struct v9fs_session_info *v9ses = NULL;
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umode_t mode = S_IRWXUGO | S_ISVTX;
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struct p9_fid *fid;
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int retval = 0;
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p9_debug(P9_DEBUG_VFS, "\n");
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v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
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if (!v9ses)
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return ERR_PTR(-ENOMEM);
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fid = v9fs_session_init(v9ses, dev_name, data);
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if (IS_ERR(fid)) {
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retval = PTR_ERR(fid);
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goto free_session;
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}
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sb = sget(fs_type, NULL, v9fs_set_super, flags, v9ses);
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if (IS_ERR(sb)) {
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retval = PTR_ERR(sb);
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goto clunk_fid;
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}
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v9fs_fill_super(sb, v9ses, flags, data);
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if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
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sb->s_d_op = &v9fs_cached_dentry_operations;
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else
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sb->s_d_op = &v9fs_dentry_operations;
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inode = v9fs_get_inode(sb, S_IFDIR | mode, 0);
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if (IS_ERR(inode)) {
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retval = PTR_ERR(inode);
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goto release_sb;
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}
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root = d_make_root(inode);
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if (!root) {
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retval = -ENOMEM;
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goto release_sb;
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}
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sb->s_root = root;
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if (v9fs_proto_dotl(v9ses)) {
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struct p9_stat_dotl *st = NULL;
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st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
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if (IS_ERR(st)) {
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retval = PTR_ERR(st);
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goto release_sb;
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}
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d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
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v9fs_stat2inode_dotl(st, d_inode(root));
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kfree(st);
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} else {
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struct p9_wstat *st = NULL;
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st = p9_client_stat(fid);
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if (IS_ERR(st)) {
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retval = PTR_ERR(st);
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goto release_sb;
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}
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d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
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v9fs_stat2inode(st, d_inode(root), sb);
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p9stat_free(st);
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kfree(st);
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}
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retval = v9fs_get_acl(inode, fid);
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if (retval)
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goto release_sb;
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v9fs_fid_add(root, fid);
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p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n");
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return dget(sb->s_root);
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clunk_fid:
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p9_client_clunk(fid);
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v9fs_session_close(v9ses);
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free_session:
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kfree(v9ses);
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return ERR_PTR(retval);
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release_sb:
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/*
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* we will do the session_close and root dentry release
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* in the below call. But we need to clunk fid, because we haven't
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* attached the fid to dentry so it won't get clunked
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* automatically.
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*/
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p9_client_clunk(fid);
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deactivate_locked_super(sb);
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return ERR_PTR(retval);
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}
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/**
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* v9fs_kill_super - Kill Superblock
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* @s: superblock
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*
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*/
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static void v9fs_kill_super(struct super_block *s)
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{
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struct v9fs_session_info *v9ses = s->s_fs_info;
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p9_debug(P9_DEBUG_VFS, " %p\n", s);
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kill_anon_super(s);
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v9fs_session_cancel(v9ses);
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v9fs_session_close(v9ses);
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kfree(v9ses);
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s->s_fs_info = NULL;
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p9_debug(P9_DEBUG_VFS, "exiting kill_super\n");
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}
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static void
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v9fs_umount_begin(struct super_block *sb)
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{
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struct v9fs_session_info *v9ses;
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v9ses = sb->s_fs_info;
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v9fs_session_begin_cancel(v9ses);
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}
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static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct v9fs_session_info *v9ses;
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struct p9_fid *fid;
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struct p9_rstatfs rs;
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int res;
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fid = v9fs_fid_lookup(dentry);
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if (IS_ERR(fid)) {
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res = PTR_ERR(fid);
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goto done;
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}
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v9ses = v9fs_dentry2v9ses(dentry);
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if (v9fs_proto_dotl(v9ses)) {
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res = p9_client_statfs(fid, &rs);
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if (res == 0) {
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buf->f_type = rs.type;
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buf->f_bsize = rs.bsize;
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buf->f_blocks = rs.blocks;
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buf->f_bfree = rs.bfree;
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buf->f_bavail = rs.bavail;
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buf->f_files = rs.files;
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buf->f_ffree = rs.ffree;
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buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL;
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buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL;
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buf->f_namelen = rs.namelen;
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}
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if (res != -ENOSYS)
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goto done;
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}
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res = simple_statfs(dentry, buf);
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done:
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return res;
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}
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static int v9fs_drop_inode(struct inode *inode)
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{
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struct v9fs_session_info *v9ses;
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v9ses = v9fs_inode2v9ses(inode);
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if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
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return generic_drop_inode(inode);
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/*
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* in case of non cached mode always drop the
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* the inode because we want the inode attribute
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* to always match that on the server.
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*/
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return 1;
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}
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static int v9fs_write_inode(struct inode *inode,
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struct writeback_control *wbc)
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{
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int ret;
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struct p9_wstat wstat;
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struct v9fs_inode *v9inode;
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/*
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* send an fsync request to server irrespective of
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* wbc->sync_mode.
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*/
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p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
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v9inode = V9FS_I(inode);
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if (!v9inode->writeback_fid)
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return 0;
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v9fs_blank_wstat(&wstat);
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ret = p9_client_wstat(v9inode->writeback_fid, &wstat);
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if (ret < 0) {
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__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
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return ret;
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}
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return 0;
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}
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static int v9fs_write_inode_dotl(struct inode *inode,
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struct writeback_control *wbc)
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{
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int ret;
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struct v9fs_inode *v9inode;
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/*
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* send an fsync request to server irrespective of
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* wbc->sync_mode.
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*/
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v9inode = V9FS_I(inode);
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p9_debug(P9_DEBUG_VFS, "%s: inode %p, writeback_fid %p\n",
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__func__, inode, v9inode->writeback_fid);
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if (!v9inode->writeback_fid)
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return 0;
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ret = p9_client_fsync(v9inode->writeback_fid, 0);
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if (ret < 0) {
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__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
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return ret;
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}
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return 0;
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}
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static const struct super_operations v9fs_super_ops = {
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.alloc_inode = v9fs_alloc_inode,
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.destroy_inode = v9fs_destroy_inode,
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.statfs = simple_statfs,
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.evict_inode = v9fs_evict_inode,
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.show_options = generic_show_options,
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.umount_begin = v9fs_umount_begin,
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.write_inode = v9fs_write_inode,
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};
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static const struct super_operations v9fs_super_ops_dotl = {
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.alloc_inode = v9fs_alloc_inode,
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.destroy_inode = v9fs_destroy_inode,
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.statfs = v9fs_statfs,
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.drop_inode = v9fs_drop_inode,
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.evict_inode = v9fs_evict_inode,
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.show_options = generic_show_options,
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.umount_begin = v9fs_umount_begin,
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.write_inode = v9fs_write_inode_dotl,
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};
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struct file_system_type v9fs_fs_type = {
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.name = "9p",
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.mount = v9fs_mount,
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.kill_sb = v9fs_kill_super,
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.owner = THIS_MODULE,
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.fs_flags = FS_RENAME_DOES_D_MOVE,
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};
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MODULE_ALIAS_FS("9p");
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