mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 05:14:38 +00:00
4b6f5d20b0
This is a conversion to make the various file_operations structs in fs/ const. Basically a regexp job, with a few manual fixups The goal is both to increase correctness (harder to accidentally write to shared datastructures) and reducing the false sharing of cachelines with things that get dirty in .data (while .rodata is nicely read only and thus cache clean) Signed-off-by: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
/* Internal data structures for ADFS */
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#define ADFS_FREE_FRAG 0
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#define ADFS_BAD_FRAG 1
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#define ADFS_ROOT_FRAG 2
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#define ADFS_NDA_OWNER_READ (1 << 0)
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#define ADFS_NDA_OWNER_WRITE (1 << 1)
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#define ADFS_NDA_LOCKED (1 << 2)
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#define ADFS_NDA_DIRECTORY (1 << 3)
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#define ADFS_NDA_EXECUTE (1 << 4)
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#define ADFS_NDA_PUBLIC_READ (1 << 5)
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#define ADFS_NDA_PUBLIC_WRITE (1 << 6)
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#include "dir_f.h"
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struct buffer_head;
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/*
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* Directory handling
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*/
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struct adfs_dir {
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struct super_block *sb;
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int nr_buffers;
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struct buffer_head *bh[4];
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unsigned int pos;
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unsigned int parent_id;
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struct adfs_dirheader dirhead;
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union adfs_dirtail dirtail;
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};
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/*
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* This is the overall maximum name length
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*/
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#define ADFS_MAX_NAME_LEN 256
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struct object_info {
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__u32 parent_id; /* parent object id */
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__u32 file_id; /* object id */
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__u32 loadaddr; /* load address */
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__u32 execaddr; /* execution address */
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__u32 size; /* size */
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__u8 attr; /* RISC OS attributes */
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unsigned char name_len; /* name length */
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char name[ADFS_MAX_NAME_LEN];/* file name */
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};
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struct adfs_dir_ops {
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int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
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int (*setpos)(struct adfs_dir *dir, unsigned int fpos);
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int (*getnext)(struct adfs_dir *dir, struct object_info *obj);
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int (*update)(struct adfs_dir *dir, struct object_info *obj);
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int (*create)(struct adfs_dir *dir, struct object_info *obj);
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int (*remove)(struct adfs_dir *dir, struct object_info *obj);
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void (*free)(struct adfs_dir *dir);
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};
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struct adfs_discmap {
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struct buffer_head *dm_bh;
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__u32 dm_startblk;
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unsigned int dm_startbit;
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unsigned int dm_endbit;
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};
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/* Inode stuff */
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struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
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int adfs_write_inode(struct inode *inode,int unused);
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int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
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/* map.c */
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extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset);
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extern unsigned int adfs_map_free(struct super_block *sb);
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/* Misc */
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void __adfs_error(struct super_block *sb, const char *function,
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const char *fmt, ...);
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#define adfs_error(sb, fmt...) __adfs_error(sb, __FUNCTION__, fmt)
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/* super.c */
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/*
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* Inodes and file operations
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*/
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/* dir_*.c */
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extern struct inode_operations adfs_dir_inode_operations;
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extern const struct file_operations adfs_dir_operations;
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extern struct dentry_operations adfs_dentry_operations;
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extern struct adfs_dir_ops adfs_f_dir_ops;
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extern struct adfs_dir_ops adfs_fplus_dir_ops;
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extern int adfs_dir_update(struct super_block *sb, struct object_info *obj);
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/* file.c */
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extern struct inode_operations adfs_file_inode_operations;
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extern const struct file_operations adfs_file_operations;
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static inline __u32 signed_asl(__u32 val, signed int shift)
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{
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if (shift >= 0)
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val <<= shift;
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else
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val >>= -shift;
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return val;
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}
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/*
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* Calculate the address of a block in an object given the block offset
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* and the object identity.
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*
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* The root directory ID should always be looked up in the map [3.4]
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*/
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static inline int
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__adfs_block_map(struct super_block *sb, unsigned int object_id,
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unsigned int block)
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{
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if (object_id & 255) {
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unsigned int off;
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off = (object_id & 255) - 1;
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block += off << ADFS_SB(sb)->s_log2sharesize;
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}
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return adfs_map_lookup(sb, object_id >> 8, block);
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}
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