diff options
Diffstat (limited to 'fs/affs/affs.h')
| -rw-r--r-- | fs/affs/affs.h | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/fs/affs/affs.h b/fs/affs/affs.h new file mode 100644 index 000000000..a92eb6ae2 --- /dev/null +++ b/fs/affs/affs.h @@ -0,0 +1,322 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifdef pr_fmt +#undef pr_fmt +#endif + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/types.h> +#include <linux/fs.h> +#include <linux/buffer_head.h> +#include "amigaffs.h" +#include <linux/mutex.h> +#include <linux/workqueue.h> + +/* Ugly macros make the code more pretty. */ + +#define GET_END_PTR(st,p,sz) ((st *)((char *)(p)+((sz)-sizeof(st)))) +#define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey]) +#define AFFS_BLOCK(sb, bh, blk) (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)]) + +#define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data) +#define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail))) +#define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data) +#define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail))) +#define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data) +#define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data) + +#define AFFS_CACHE_SIZE PAGE_SIZE + +#define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2) +#define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2) +#define AFFS_AC_MASK (AFFS_AC_SIZE-1) + +#define AFFSNAMEMAX 30U + +struct affs_ext_key { + u32 ext; /* idx of the extended block */ + u32 key; /* block number */ +}; + +/* + * affs fs inode data in memory + */ +struct affs_inode_info { + atomic_t i_opencnt; + struct semaphore i_link_lock; /* Protects internal inode access. */ + struct semaphore i_ext_lock; /* Protects internal inode access. */ +#define i_hash_lock i_ext_lock + u32 i_blkcnt; /* block count */ + u32 i_extcnt; /* extended block count */ + u32 *i_lc; /* linear cache of extended blocks */ + u32 i_lc_size; + u32 i_lc_shift; + u32 i_lc_mask; + struct affs_ext_key *i_ac; /* associative cache of extended blocks */ + u32 i_ext_last; /* last accessed extended block */ + struct buffer_head *i_ext_bh; /* bh of last extended block */ + loff_t mmu_private; + u32 i_protect; /* unused attribute bits */ + u32 i_lastalloc; /* last allocated block */ + int i_pa_cnt; /* number of preallocated blocks */ + struct inode vfs_inode; +}; + +/* short cut to get to the affs specific inode data */ +static inline struct affs_inode_info *AFFS_I(struct inode *inode) +{ + return container_of(inode, struct affs_inode_info, vfs_inode); +} + +/* + * super-block data in memory + * + * Block numbers are adjusted for their actual size + * + */ + +struct affs_bm_info { + u32 bm_key; /* Disk block number */ + u32 bm_free; /* Free blocks in here */ +}; + +struct affs_sb_info { + int s_partition_size; /* Partition size in blocks. */ + int s_reserved; /* Number of reserved blocks. */ + //u32 s_blksize; /* Initial device blksize */ + u32 s_data_blksize; /* size of the data block w/o header */ + u32 s_root_block; /* FFS root block number. */ + int s_hashsize; /* Size of hash table. */ + unsigned long s_flags; /* See below. */ + kuid_t s_uid; /* uid to override */ + kgid_t s_gid; /* gid to override */ + umode_t s_mode; /* mode to override */ + struct buffer_head *s_root_bh; /* Cached root block. */ + struct mutex s_bmlock; /* Protects bitmap access. */ + struct affs_bm_info *s_bitmap; /* Bitmap infos. */ + u32 s_bmap_count; /* # of bitmap blocks. */ + u32 s_bmap_bits; /* # of bits in one bitmap blocks */ + u32 s_last_bmap; + struct buffer_head *s_bmap_bh; + char *s_prefix; /* Prefix for volumes and assigns. */ + char s_volume[32]; /* Volume prefix for absolute symlinks. */ + spinlock_t symlink_lock; /* protects the previous two */ + struct super_block *sb; /* the VFS superblock object */ + int work_queued; /* non-zero delayed work is queued */ + struct delayed_work sb_work; /* superblock flush delayed work */ + spinlock_t work_lock; /* protects sb_work and work_queued */ +}; + +#define AFFS_MOUNT_SF_INTL 0x0001 /* International filesystem. */ +#define AFFS_MOUNT_SF_BM_VALID 0x0002 /* Bitmap is valid. */ +#define AFFS_MOUNT_SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */ +#define AFFS_MOUNT_SF_QUIET 0x0008 /* chmod errors will be not reported */ +#define AFFS_MOUNT_SF_SETUID 0x0010 /* Ignore Amiga uid */ +#define AFFS_MOUNT_SF_SETGID 0x0020 /* Ignore Amiga gid */ +#define AFFS_MOUNT_SF_SETMODE 0x0040 /* Ignore Amiga protection bits */ +#define AFFS_MOUNT_SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */ +#define AFFS_MOUNT_SF_OFS 0x0200 /* Old filesystem */ +#define AFFS_MOUNT_SF_PREFIX 0x0400 /* Buffer for prefix is allocated */ +#define AFFS_MOUNT_SF_VERBOSE 0x0800 /* Talk about fs when mounting */ +#define AFFS_MOUNT_SF_NO_TRUNCATE 0x1000 /* Don't truncate filenames */ + +#define affs_clear_opt(o, opt) (o &= ~AFFS_MOUNT_##opt) +#define affs_set_opt(o, opt) (o |= AFFS_MOUNT_##opt) +#define affs_test_opt(o, opt) ((o) & AFFS_MOUNT_##opt) + +/* short cut to get to the affs specific sb data */ +static inline struct affs_sb_info *AFFS_SB(struct super_block *sb) +{ + return sb->s_fs_info; +} + +void affs_mark_sb_dirty(struct super_block *sb); + +/* amigaffs.c */ + +extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh); +extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh); +extern int affs_remove_header(struct dentry *dentry); +extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh); +extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh); +extern void affs_secs_to_datestamp(time64_t secs, struct affs_date *ds); +extern umode_t affs_prot_to_mode(u32 prot); +extern void affs_mode_to_prot(struct inode *inode); +__printf(3, 4) +extern void affs_error(struct super_block *sb, const char *function, + const char *fmt, ...); +__printf(3, 4) +extern void affs_warning(struct super_block *sb, const char *function, + const char *fmt, ...); +extern bool affs_nofilenametruncate(const struct dentry *dentry); +extern int affs_check_name(const unsigned char *name, int len, + bool notruncate); +extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry); + +/* bitmap. c */ + +extern u32 affs_count_free_blocks(struct super_block *s); +extern void affs_free_block(struct super_block *sb, u32 block); +extern u32 affs_alloc_block(struct inode *inode, u32 goal); +extern int affs_init_bitmap(struct super_block *sb, int *flags); +extern void affs_free_bitmap(struct super_block *sb); + +/* namei.c */ + +extern const struct export_operations affs_export_ops; +extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len); +extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int); +extern int affs_unlink(struct inode *dir, struct dentry *dentry); +extern int affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool); +extern int affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); +extern int affs_rmdir(struct inode *dir, struct dentry *dentry); +extern int affs_link(struct dentry *olddentry, struct inode *dir, + struct dentry *dentry); +extern int affs_symlink(struct inode *dir, struct dentry *dentry, + const char *symname); +extern int affs_rename2(struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry, + unsigned int flags); + +/* inode.c */ + +extern struct inode *affs_new_inode(struct inode *dir); +extern int affs_notify_change(struct dentry *dentry, struct iattr *attr); +extern void affs_evict_inode(struct inode *inode); +extern struct inode *affs_iget(struct super_block *sb, + unsigned long ino); +extern int affs_write_inode(struct inode *inode, + struct writeback_control *wbc); +extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type); + +/* file.c */ + +void affs_free_prealloc(struct inode *inode); +extern void affs_truncate(struct inode *); +int affs_file_fsync(struct file *, loff_t, loff_t, int); + +/* dir.c */ + +extern void affs_dir_truncate(struct inode *); + +/* jump tables */ + +extern const struct inode_operations affs_file_inode_operations; +extern const struct inode_operations affs_dir_inode_operations; +extern const struct inode_operations affs_symlink_inode_operations; +extern const struct file_operations affs_file_operations; +extern const struct file_operations affs_file_operations_ofs; +extern const struct file_operations affs_dir_operations; +extern const struct address_space_operations affs_symlink_aops; +extern const struct address_space_operations affs_aops; +extern const struct address_space_operations affs_aops_ofs; + +extern const struct dentry_operations affs_dentry_operations; +extern const struct dentry_operations affs_intl_dentry_operations; + +static inline bool affs_validblock(struct super_block *sb, int block) +{ + return(block >= AFFS_SB(sb)->s_reserved && + block < AFFS_SB(sb)->s_partition_size); +} + +static inline void +affs_set_blocksize(struct super_block *sb, int size) +{ + sb_set_blocksize(sb, size); +} +static inline struct buffer_head * +affs_bread(struct super_block *sb, int block) +{ + pr_debug("%s: %d\n", __func__, block); + if (affs_validblock(sb, block)) + return sb_bread(sb, block); + return NULL; +} +static inline struct buffer_head * +affs_getblk(struct super_block *sb, int block) +{ + pr_debug("%s: %d\n", __func__, block); + if (affs_validblock(sb, block)) + return sb_getblk(sb, block); + return NULL; +} +static inline struct buffer_head * +affs_getzeroblk(struct super_block *sb, int block) +{ + struct buffer_head *bh; + pr_debug("%s: %d\n", __func__, block); + if (affs_validblock(sb, block)) { + bh = sb_getblk(sb, block); + lock_buffer(bh); + memset(bh->b_data, 0 , sb->s_blocksize); + set_buffer_uptodate(bh); + unlock_buffer(bh); + return bh; + } + return NULL; +} +static inline struct buffer_head * +affs_getemptyblk(struct super_block *sb, int block) +{ + struct buffer_head *bh; + pr_debug("%s: %d\n", __func__, block); + if (affs_validblock(sb, block)) { + bh = sb_getblk(sb, block); + wait_on_buffer(bh); + set_buffer_uptodate(bh); + return bh; + } + return NULL; +} +static inline void +affs_brelse(struct buffer_head *bh) +{ + if (bh) + pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr); + brelse(bh); +} + +static inline void +affs_adjust_checksum(struct buffer_head *bh, u32 val) +{ + u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]); + ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val); +} +static inline void +affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val) +{ + u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]); + ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val); +} + +static inline void +affs_lock_link(struct inode *inode) +{ + down(&AFFS_I(inode)->i_link_lock); +} +static inline void +affs_unlock_link(struct inode *inode) +{ + up(&AFFS_I(inode)->i_link_lock); +} +static inline void +affs_lock_dir(struct inode *inode) +{ + down(&AFFS_I(inode)->i_hash_lock); +} +static inline void +affs_unlock_dir(struct inode *inode) +{ + up(&AFFS_I(inode)->i_hash_lock); +} +static inline void +affs_lock_ext(struct inode *inode) +{ + down(&AFFS_I(inode)->i_ext_lock); +} +static inline void +affs_unlock_ext(struct inode *inode) +{ + up(&AFFS_I(inode)->i_ext_lock); +} |