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328 lines
11 KiB
328 lines
11 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifdef pr_fmt |
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#undef pr_fmt |
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#endif |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#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 "amigaffs.h" |
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#include <linux/mutex.h> |
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#include <linux/workqueue.h> |
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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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#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_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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#define AFFSNAMEMAX 30U |
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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 mutex i_link_lock; /* Protects internal inode access. */ |
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struct mutex 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 container_of(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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kuid_t s_uid; /* uid to override */ |
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kgid_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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struct super_block *sb; /* the VFS superblock object */ |
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int work_queued; /* non-zero delayed work is queued */ |
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struct delayed_work sb_work; /* superblock flush delayed work */ |
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spinlock_t work_lock; /* protects sb_work and work_queued */ |
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}; |
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#define AFFS_MOUNT_SF_INTL 0x0001 /* International filesystem. */ |
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#define AFFS_MOUNT_SF_BM_VALID 0x0002 /* Bitmap is valid. */ |
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#define AFFS_MOUNT_SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */ |
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#define AFFS_MOUNT_SF_QUIET 0x0008 /* chmod errors will be not reported */ |
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#define AFFS_MOUNT_SF_SETUID 0x0010 /* Ignore Amiga uid */ |
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#define AFFS_MOUNT_SF_SETGID 0x0020 /* Ignore Amiga gid */ |
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#define AFFS_MOUNT_SF_SETMODE 0x0040 /* Ignore Amiga protection bits */ |
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#define AFFS_MOUNT_SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */ |
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#define AFFS_MOUNT_SF_OFS 0x0200 /* Old filesystem */ |
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#define AFFS_MOUNT_SF_PREFIX 0x0400 /* Buffer for prefix is allocated */ |
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#define AFFS_MOUNT_SF_VERBOSE 0x0800 /* Talk about fs when mounting */ |
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#define AFFS_MOUNT_SF_NO_TRUNCATE 0x1000 /* Don't truncate filenames */ |
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#define affs_clear_opt(o, opt) (o &= ~AFFS_MOUNT_##opt) |
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#define affs_set_opt(o, opt) (o |= AFFS_MOUNT_##opt) |
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#define affs_test_opt(o, opt) ((o) & AFFS_MOUNT_##opt) |
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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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void affs_mark_sb_dirty(struct super_block *sb); |
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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 affs_secs_to_datestamp(time64_t secs, struct affs_date *ds); |
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extern umode_t affs_prot_to_mode(u32 prot); |
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extern void affs_mode_to_prot(struct inode *inode); |
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__printf(3, 4) |
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extern void affs_error(struct super_block *sb, const char *function, |
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const char *fmt, ...); |
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__printf(3, 4) |
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extern void affs_warning(struct super_block *sb, const char *function, |
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const char *fmt, ...); |
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extern bool affs_nofilenametruncate(const struct dentry *dentry); |
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extern int affs_check_name(const unsigned char *name, int len, |
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bool notruncate); |
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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 const struct export_operations affs_export_ops; |
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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, unsigned int); |
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extern int affs_unlink(struct inode *dir, struct dentry *dentry); |
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extern int affs_create(struct user_namespace *mnt_userns, struct inode *dir, |
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struct dentry *dentry, umode_t mode, bool); |
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extern int affs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, |
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struct dentry *dentry, umode_t 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 user_namespace *mnt_userns, |
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struct inode *dir, struct dentry *dentry, |
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const char *symname); |
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extern int affs_rename2(struct user_namespace *mnt_userns, |
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struct inode *old_dir, struct dentry *old_dentry, |
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struct inode *new_dir, struct dentry *new_dentry, |
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unsigned int flags); |
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/* inode.c */ |
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extern struct inode *affs_new_inode(struct inode *dir); |
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extern int affs_notify_change(struct user_namespace *mnt_userns, |
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struct dentry *dentry, struct iattr *attr); |
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extern void affs_evict_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, |
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struct writeback_control *wbc); |
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extern int affs_add_entry(struct inode *dir, struct inode *inode, |
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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 *, loff_t, loff_t, 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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extern const struct dentry_operations affs_intl_dentry_operations; |
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static inline bool affs_validblock(struct super_block *sb, int block) |
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{ |
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return(block >= AFFS_SB(sb)->s_reserved && |
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block < AFFS_SB(sb)->s_partition_size); |
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} |
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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("%s: %d\n", __func__, block); |
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if (affs_validblock(sb, block)) |
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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("%s: %d\n", __func__, block); |
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if (affs_validblock(sb, block)) |
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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("%s: %d\n", __func__, block); |
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if (affs_validblock(sb, block)) { |
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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("%s: %d\n", __func__, block); |
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if (affs_validblock(sb, block)) { |
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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("%s: %lld\n", __func__, (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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mutex_lock(&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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mutex_unlock(&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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mutex_lock_nested(&AFFS_I(inode)->i_hash_lock, SINGLE_DEPTH_NESTING); |
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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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mutex_unlock(&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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mutex_lock(&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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mutex_unlock(&AFFS_I(inode)->i_ext_lock); |
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}
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