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![Arjan van de Ven](/assets/img/avatar_default.png)
Many struct inode_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
164 lines
4.9 KiB
C
164 lines
4.9 KiB
C
/*
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* ntfs.h - Defines for NTFS Linux kernel driver. Part of the Linux-NTFS
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* project.
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*
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* Copyright (c) 2001-2005 Anton Altaparmakov
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* Copyright (C) 2002 Richard Russon
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of 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 (in the main directory of the Linux-NTFS
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LINUX_NTFS_H
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#define _LINUX_NTFS_H
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#include <linux/stddef.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/compiler.h>
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#include <linux/fs.h>
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#include <linux/nls.h>
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#include <linux/smp.h>
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#include <linux/pagemap.h>
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#include "types.h"
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#include "volume.h"
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#include "layout.h"
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typedef enum {
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NTFS_BLOCK_SIZE = 512,
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NTFS_BLOCK_SIZE_BITS = 9,
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NTFS_SB_MAGIC = 0x5346544e, /* 'NTFS' */
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NTFS_MAX_NAME_LEN = 255,
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NTFS_MAX_ATTR_NAME_LEN = 255,
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NTFS_MAX_CLUSTER_SIZE = 64 * 1024, /* 64kiB */
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NTFS_MAX_PAGES_PER_CLUSTER = NTFS_MAX_CLUSTER_SIZE / PAGE_CACHE_SIZE,
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} NTFS_CONSTANTS;
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/* Global variables. */
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/* Slab caches (from super.c). */
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extern struct kmem_cache *ntfs_name_cache;
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extern struct kmem_cache *ntfs_inode_cache;
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extern struct kmem_cache *ntfs_big_inode_cache;
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extern struct kmem_cache *ntfs_attr_ctx_cache;
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extern struct kmem_cache *ntfs_index_ctx_cache;
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/* The various operations structs defined throughout the driver files. */
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extern const struct address_space_operations ntfs_aops;
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extern const struct address_space_operations ntfs_mst_aops;
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extern const struct file_operations ntfs_file_ops;
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extern const struct inode_operations ntfs_file_inode_ops;
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extern const struct file_operations ntfs_dir_ops;
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extern const struct inode_operations ntfs_dir_inode_ops;
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extern const struct file_operations ntfs_empty_file_ops;
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extern const struct inode_operations ntfs_empty_inode_ops;
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extern struct export_operations ntfs_export_ops;
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/**
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* NTFS_SB - return the ntfs volume given a vfs super block
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* @sb: VFS super block
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*
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* NTFS_SB() returns the ntfs volume associated with the VFS super block @sb.
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*/
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static inline ntfs_volume *NTFS_SB(struct super_block *sb)
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{
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return sb->s_fs_info;
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}
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/* Declarations of functions and global variables. */
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/* From fs/ntfs/compress.c */
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extern int ntfs_read_compressed_block(struct page *page);
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extern int allocate_compression_buffers(void);
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extern void free_compression_buffers(void);
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/* From fs/ntfs/super.c */
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#define default_upcase_len 0x10000
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extern struct mutex ntfs_lock;
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typedef struct {
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int val;
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char *str;
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} option_t;
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extern const option_t on_errors_arr[];
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/* From fs/ntfs/mst.c */
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extern int post_read_mst_fixup(NTFS_RECORD *b, const u32 size);
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extern int pre_write_mst_fixup(NTFS_RECORD *b, const u32 size);
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extern void post_write_mst_fixup(NTFS_RECORD *b);
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/* From fs/ntfs/unistr.c */
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extern bool ntfs_are_names_equal(const ntfschar *s1, size_t s1_len,
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const ntfschar *s2, size_t s2_len,
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const IGNORE_CASE_BOOL ic,
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const ntfschar *upcase, const u32 upcase_size);
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extern int ntfs_collate_names(const ntfschar *name1, const u32 name1_len,
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const ntfschar *name2, const u32 name2_len,
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const int err_val, const IGNORE_CASE_BOOL ic,
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const ntfschar *upcase, const u32 upcase_len);
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extern int ntfs_ucsncmp(const ntfschar *s1, const ntfschar *s2, size_t n);
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extern int ntfs_ucsncasecmp(const ntfschar *s1, const ntfschar *s2, size_t n,
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const ntfschar *upcase, const u32 upcase_size);
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extern void ntfs_upcase_name(ntfschar *name, u32 name_len,
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const ntfschar *upcase, const u32 upcase_len);
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extern void ntfs_file_upcase_value(FILE_NAME_ATTR *file_name_attr,
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const ntfschar *upcase, const u32 upcase_len);
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extern int ntfs_file_compare_values(FILE_NAME_ATTR *file_name_attr1,
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FILE_NAME_ATTR *file_name_attr2,
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const int err_val, const IGNORE_CASE_BOOL ic,
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const ntfschar *upcase, const u32 upcase_len);
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extern int ntfs_nlstoucs(const ntfs_volume *vol, const char *ins,
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const int ins_len, ntfschar **outs);
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extern int ntfs_ucstonls(const ntfs_volume *vol, const ntfschar *ins,
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const int ins_len, unsigned char **outs, int outs_len);
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/* From fs/ntfs/upcase.c */
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extern ntfschar *generate_default_upcase(void);
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static inline int ntfs_ffs(int x)
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{
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int r = 1;
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if (!x)
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return 0;
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if (!(x & 0xffff)) {
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x >>= 16;
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r += 16;
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}
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if (!(x & 0xff)) {
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x >>= 8;
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r += 8;
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}
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if (!(x & 0xf)) {
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x >>= 4;
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r += 4;
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}
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if (!(x & 3)) {
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x >>= 2;
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r += 2;
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}
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if (!(x & 1)) {
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x >>= 1;
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r += 1;
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}
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return r;
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}
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#endif /* _LINUX_NTFS_H */
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