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![Christoph Hellwig](/assets/img/avatar_default.png)
This gives the filesystem more information about the writeback that is happening. Trond requested this for the NFS unstable write handling, and other filesystems might benefit from this too by beeing able to distinguish between the different callers in more detail. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
183 lines
5 KiB
C
183 lines
5 KiB
C
#include <linux/fs.h>
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#include <linux/adfs_fs.h>
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/* 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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* adfs file system inode data in memory
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*/
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struct adfs_inode_info {
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loff_t mmu_private;
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unsigned long parent_id; /* object id of parent */
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__u32 loadaddr; /* RISC OS load address */
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__u32 execaddr; /* RISC OS exec address */
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unsigned int filetype; /* RISC OS file type */
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unsigned int attr; /* RISC OS permissions */
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unsigned int stamped:1; /* RISC OS file has date/time */
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struct inode vfs_inode;
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};
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/*
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* Forward-declare this
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*/
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struct adfs_discmap;
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struct adfs_dir_ops;
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/*
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* ADFS file system superblock data in memory
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*/
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struct adfs_sb_info {
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struct adfs_discmap *s_map; /* bh list containing map */
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struct adfs_dir_ops *s_dir; /* directory operations */
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uid_t s_uid; /* owner uid */
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gid_t s_gid; /* owner gid */
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umode_t s_owner_mask; /* ADFS owner perm -> unix perm */
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umode_t s_other_mask; /* ADFS other perm -> unix perm */
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__u32 s_ids_per_zone; /* max. no ids in one zone */
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__u32 s_idlen; /* length of ID in map */
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__u32 s_map_size; /* sector size of a map */
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unsigned long s_size; /* total size (in blocks) of this fs */
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signed int s_map2blk; /* shift left by this for map->sector */
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unsigned int s_log2sharesize;/* log2 share size */
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__le32 s_version; /* disc format version */
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unsigned int s_namelen; /* maximum number of characters in name */
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};
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static inline struct adfs_sb_info *ADFS_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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static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
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{
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return container_of(inode, struct adfs_inode_info, vfs_inode);
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}
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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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int (*sync)(struct adfs_dir *dir);
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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, struct writeback_control *wbc);
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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, __func__, 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 const struct inode_operations adfs_dir_inode_operations;
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extern const struct file_operations adfs_dir_operations;
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extern const 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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int wait);
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/* file.c */
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extern const 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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