305 lines
10 KiB
C
305 lines
10 KiB
C
#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/amigaffs.h>
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#include <linux/mutex.h>
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/* AmigaOS allows file names with up to 30 characters length.
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* Names longer than that will be silently truncated. If you
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* want to disallow this, comment out the following #define.
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* Creating filesystem objects with longer names will then
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* result in an error (ENAMETOOLONG).
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*/
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/*#define AFFS_NO_TRUNCATE */
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/* Ugly macros make the code more pretty. */
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#define GET_END_PTR(st,p,sz) ((st *)((char *)(p)+((sz)-sizeof(st))))
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#define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
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#define AFFS_BLOCK(sb, bh, blk) (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
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#ifdef __LITTLE_ENDIAN
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#define BO_EXBITS 0x18UL
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#elif defined(__BIG_ENDIAN)
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#define BO_EXBITS 0x00UL
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#else
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#error Endianness must be known for affs to work.
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#endif
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#define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data)
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#define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
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#define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data)
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#define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
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#define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data)
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#define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data)
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#define AFFS_CACHE_SIZE PAGE_SIZE
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#define AFFS_MAX_PREALLOC 32
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#define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2)
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#define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
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#define AFFS_AC_MASK (AFFS_AC_SIZE-1)
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struct affs_ext_key {
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u32 ext; /* idx of the extended block */
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u32 key; /* block number */
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};
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/*
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* affs fs inode data in memory
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*/
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struct affs_inode_info {
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atomic_t i_opencnt;
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struct semaphore i_link_lock; /* Protects internal inode access. */
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struct semaphore i_ext_lock; /* Protects internal inode access. */
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#define i_hash_lock i_ext_lock
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u32 i_blkcnt; /* block count */
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u32 i_extcnt; /* extended block count */
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u32 *i_lc; /* linear cache of extended blocks */
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u32 i_lc_size;
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u32 i_lc_shift;
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u32 i_lc_mask;
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struct affs_ext_key *i_ac; /* associative cache of extended blocks */
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u32 i_ext_last; /* last accessed extended block */
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struct buffer_head *i_ext_bh; /* bh of last extended block */
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loff_t mmu_private;
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u32 i_protect; /* unused attribute bits */
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u32 i_lastalloc; /* last allocated block */
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int i_pa_cnt; /* number of preallocated blocks */
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struct inode vfs_inode;
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};
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/* short cut to get to the affs specific inode data */
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static inline struct affs_inode_info *AFFS_I(struct inode *inode)
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{
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return list_entry(inode, struct affs_inode_info, vfs_inode);
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}
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/*
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* super-block data in memory
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*
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* Block numbers are adjusted for their actual size
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*
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*/
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struct affs_bm_info {
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u32 bm_key; /* Disk block number */
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u32 bm_free; /* Free blocks in here */
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};
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struct affs_sb_info {
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int s_partition_size; /* Partition size in blocks. */
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int s_reserved; /* Number of reserved blocks. */
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//u32 s_blksize; /* Initial device blksize */
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u32 s_data_blksize; /* size of the data block w/o header */
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u32 s_root_block; /* FFS root block number. */
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int s_hashsize; /* Size of hash table. */
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unsigned long s_flags; /* See below. */
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uid_t s_uid; /* uid to override */
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gid_t s_gid; /* gid to override */
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umode_t s_mode; /* mode to override */
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struct buffer_head *s_root_bh; /* Cached root block. */
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struct mutex s_bmlock; /* Protects bitmap access. */
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struct affs_bm_info *s_bitmap; /* Bitmap infos. */
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u32 s_bmap_count; /* # of bitmap blocks. */
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u32 s_bmap_bits; /* # of bits in one bitmap blocks */
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u32 s_last_bmap;
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struct buffer_head *s_bmap_bh;
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char *s_prefix; /* Prefix for volumes and assigns. */
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char s_volume[32]; /* Volume prefix for absolute symlinks. */
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spinlock_t symlink_lock; /* protects the previous two */
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};
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#define SF_INTL 0x0001 /* International filesystem. */
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#define SF_BM_VALID 0x0002 /* Bitmap is valid. */
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#define SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */
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#define SF_QUIET 0x0008 /* chmod errors will be not reported */
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#define SF_SETUID 0x0010 /* Ignore Amiga uid */
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#define SF_SETGID 0x0020 /* Ignore Amiga gid */
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#define SF_SETMODE 0x0040 /* Ignore Amiga protection bits */
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#define SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */
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#define SF_OFS 0x0200 /* Old filesystem */
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#define SF_PREFIX 0x0400 /* Buffer for prefix is allocated */
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#define SF_VERBOSE 0x0800 /* Talk about fs when mounting */
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/* short cut to get to the affs specific sb data */
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static inline struct affs_sb_info *AFFS_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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/* amigaffs.c */
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extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh);
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extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
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extern int affs_remove_header(struct dentry *dentry);
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extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
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extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
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extern void secs_to_datestamp(time_t secs, struct affs_date *ds);
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extern mode_t prot_to_mode(u32 prot);
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extern void mode_to_prot(struct inode *inode);
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extern void affs_error(struct super_block *sb, const char *function, const char *fmt, ...);
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extern void affs_warning(struct super_block *sb, const char *function, const char *fmt, ...);
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extern int affs_check_name(const unsigned char *name, int len);
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extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry);
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/* bitmap. c */
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extern u32 affs_count_free_blocks(struct super_block *s);
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extern void affs_free_block(struct super_block *sb, u32 block);
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extern u32 affs_alloc_block(struct inode *inode, u32 goal);
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extern int affs_init_bitmap(struct super_block *sb, int *flags);
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extern void affs_free_bitmap(struct super_block *sb);
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/* namei.c */
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extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
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extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *);
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extern int affs_unlink(struct inode *dir, struct dentry *dentry);
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extern int affs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *);
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extern int affs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
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extern int affs_rmdir(struct inode *dir, struct dentry *dentry);
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extern int affs_link(struct dentry *olddentry, struct inode *dir,
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struct dentry *dentry);
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extern int affs_symlink(struct inode *dir, struct dentry *dentry,
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const char *symname);
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extern int affs_rename(struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry);
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/* inode.c */
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extern unsigned long affs_parent_ino(struct inode *dir);
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extern struct inode *affs_new_inode(struct inode *dir);
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extern int affs_notify_change(struct dentry *dentry, struct iattr *attr);
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extern void affs_delete_inode(struct inode *inode);
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extern void affs_clear_inode(struct inode *inode);
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extern struct inode *affs_iget(struct super_block *sb,
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unsigned long ino);
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extern int affs_write_inode(struct inode *inode, int);
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extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
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/* file.c */
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void affs_free_prealloc(struct inode *inode);
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extern void affs_truncate(struct inode *);
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int affs_file_fsync(struct file *, struct dentry *, int);
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/* dir.c */
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extern void affs_dir_truncate(struct inode *);
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/* jump tables */
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extern const struct inode_operations affs_file_inode_operations;
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extern const struct inode_operations affs_dir_inode_operations;
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extern const struct inode_operations affs_symlink_inode_operations;
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extern const struct file_operations affs_file_operations;
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extern const struct file_operations affs_file_operations_ofs;
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extern const struct file_operations affs_dir_operations;
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extern const struct address_space_operations affs_symlink_aops;
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extern const struct address_space_operations affs_aops;
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extern const struct address_space_operations affs_aops_ofs;
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extern const struct dentry_operations affs_dentry_operations;
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static inline void
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affs_set_blocksize(struct super_block *sb, int size)
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{
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sb_set_blocksize(sb, size);
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}
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static inline struct buffer_head *
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affs_bread(struct super_block *sb, int block)
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{
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pr_debug("affs_bread: %d\n", block);
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if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
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return sb_bread(sb, block);
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return NULL;
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}
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static inline struct buffer_head *
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affs_getblk(struct super_block *sb, int block)
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{
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pr_debug("affs_getblk: %d\n", block);
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if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
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return sb_getblk(sb, block);
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return NULL;
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}
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static inline struct buffer_head *
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affs_getzeroblk(struct super_block *sb, int block)
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{
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struct buffer_head *bh;
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pr_debug("affs_getzeroblk: %d\n", block);
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if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
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bh = sb_getblk(sb, block);
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lock_buffer(bh);
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memset(bh->b_data, 0 , sb->s_blocksize);
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set_buffer_uptodate(bh);
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unlock_buffer(bh);
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return bh;
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}
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return NULL;
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}
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static inline struct buffer_head *
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affs_getemptyblk(struct super_block *sb, int block)
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{
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struct buffer_head *bh;
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pr_debug("affs_getemptyblk: %d\n", block);
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if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
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bh = sb_getblk(sb, block);
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wait_on_buffer(bh);
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set_buffer_uptodate(bh);
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return bh;
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}
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return NULL;
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}
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static inline void
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affs_brelse(struct buffer_head *bh)
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{
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if (bh)
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pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr);
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brelse(bh);
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}
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static inline void
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affs_adjust_checksum(struct buffer_head *bh, u32 val)
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{
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u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
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((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
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}
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static inline void
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affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
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{
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u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
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((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
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}
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static inline void
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affs_lock_link(struct inode *inode)
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{
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down(&AFFS_I(inode)->i_link_lock);
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}
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static inline void
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affs_unlock_link(struct inode *inode)
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{
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up(&AFFS_I(inode)->i_link_lock);
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}
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static inline void
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affs_lock_dir(struct inode *inode)
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{
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down(&AFFS_I(inode)->i_hash_lock);
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}
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static inline void
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affs_unlock_dir(struct inode *inode)
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{
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up(&AFFS_I(inode)->i_hash_lock);
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}
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static inline void
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affs_lock_ext(struct inode *inode)
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{
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down(&AFFS_I(inode)->i_ext_lock);
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}
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static inline void
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affs_unlock_ext(struct inode *inode)
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{
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up(&AFFS_I(inode)->i_ext_lock);
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}
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