/* 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 mutex i_link_lock; /* Protects internal inode access. */ struct mutex 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) { mutex_lock(&AFFS_I(inode)->i_link_lock); } static inline void affs_unlock_link(struct inode *inode) { mutex_unlock(&AFFS_I(inode)->i_link_lock); } static inline void affs_lock_dir(struct inode *inode) { mutex_lock_nested(&AFFS_I(inode)->i_hash_lock, SINGLE_DEPTH_NESTING); } static inline void affs_unlock_dir(struct inode *inode) { mutex_unlock(&AFFS_I(inode)->i_hash_lock); } static inline void affs_lock_ext(struct inode *inode) { mutex_lock(&AFFS_I(inode)->i_ext_lock); } static inline void affs_unlock_ext(struct inode *inode) { mutex_unlock(&AFFS_I(inode)->i_ext_lock); }