| /* 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); |
| } |