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379 lines
13 KiB
379 lines
13 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* linux/fs/hpfs/hpfs_fn.h |
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* |
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* Mikulas Patocka ([email protected]), 1998-1999 |
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* |
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* function headers |
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*/ |
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//#define DBG |
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//#define DEBUG_LOCKS |
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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/mutex.h> |
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#include <linux/pagemap.h> |
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#include <linux/buffer_head.h> |
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#include <linux/slab.h> |
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#include <linux/sched/signal.h> |
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#include <linux/blkdev.h> |
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#include <asm/unaligned.h> |
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#include "hpfs.h" |
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#define EIOERROR EIO |
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#define EFSERROR EUCLEAN |
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#define ANODE_ALLOC_FWD 512 |
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#define FNODE_ALLOC_FWD 0 |
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#define ALLOC_FWD_MIN 16 |
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#define ALLOC_FWD_MAX 128 |
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#define ALLOC_M 1 |
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#define FNODE_RD_AHEAD 16 |
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#define ANODE_RD_AHEAD 0 |
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#define DNODE_RD_AHEAD 72 |
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#define COUNT_RD_AHEAD 62 |
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#define FREE_DNODES_ADD 58 |
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#define FREE_DNODES_DEL 29 |
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#define CHKCOND(x,y) if (!(x)) printk y |
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struct hpfs_inode_info { |
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loff_t mmu_private; |
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ino_t i_parent_dir; /* (directories) gives fnode of parent dir */ |
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unsigned i_dno; /* (directories) root dnode */ |
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unsigned i_dpos; /* (directories) temp for readdir */ |
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unsigned i_dsubdno; /* (directories) temp for readdir */ |
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unsigned i_file_sec; /* (files) minimalist cache of alloc info */ |
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unsigned i_disk_sec; /* (files) minimalist cache of alloc info */ |
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unsigned i_n_secs; /* (files) minimalist cache of alloc info */ |
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unsigned i_ea_size; /* size of extended attributes */ |
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unsigned i_ea_mode : 1; /* file's permission is stored in ea */ |
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unsigned i_ea_uid : 1; /* file's uid is stored in ea */ |
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unsigned i_ea_gid : 1; /* file's gid is stored in ea */ |
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unsigned i_dirty : 1; |
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loff_t **i_rddir_off; |
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struct inode vfs_inode; |
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}; |
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struct hpfs_sb_info { |
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struct mutex hpfs_mutex; /* global hpfs lock */ |
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ino_t sb_root; /* inode number of root dir */ |
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unsigned sb_fs_size; /* file system size, sectors */ |
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unsigned sb_bitmaps; /* sector number of bitmap list */ |
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unsigned sb_dirband_start; /* directory band start sector */ |
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unsigned sb_dirband_size; /* directory band size, dnodes */ |
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unsigned sb_dmap; /* sector number of dnode bit map */ |
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unsigned sb_n_free; /* free blocks for statfs, or -1 */ |
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unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */ |
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kuid_t sb_uid; /* uid from mount options */ |
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kgid_t sb_gid; /* gid from mount options */ |
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umode_t sb_mode; /* mode from mount options */ |
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unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */ |
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unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */ |
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unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */ |
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unsigned sb_lowercase : 1; /* downcase filenames hackery */ |
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unsigned sb_was_error : 1; /* there was an error, set dirty flag */ |
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unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */ |
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unsigned char *sb_cp_table; /* code page tables: */ |
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/* 128 bytes uppercasing table & */ |
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/* 128 bytes lowercasing table */ |
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__le32 *sb_bmp_dir; /* main bitmap directory */ |
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unsigned sb_c_bitmap; /* current bitmap */ |
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unsigned sb_max_fwd_alloc; /* max forwad allocation */ |
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int sb_timeshift; |
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struct rcu_head rcu; |
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unsigned n_hotfixes; |
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secno hotfix_from[256]; |
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secno hotfix_to[256]; |
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}; |
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/* Four 512-byte buffers and the 2k block obtained by concatenating them */ |
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struct quad_buffer_head { |
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struct buffer_head *bh[4]; |
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void *data; |
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}; |
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/* The b-tree down pointer from a dir entry */ |
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static inline dnode_secno de_down_pointer (struct hpfs_dirent *de) |
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{ |
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CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n")); |
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return le32_to_cpu(*(__le32 *) ((void *) de + le16_to_cpu(de->length) - 4)); |
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} |
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/* The first dir entry in a dnode */ |
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static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode) |
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{ |
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return (void *) dnode->dirent; |
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} |
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/* The end+1 of the dir entries */ |
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static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode) |
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{ |
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CHKCOND(le32_to_cpu(dnode->first_free)>=0x14 && le32_to_cpu(dnode->first_free)<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %x\n",(unsigned)le32_to_cpu(dnode->first_free))); |
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return (void *) dnode + le32_to_cpu(dnode->first_free); |
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} |
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/* The dir entry after dir entry de */ |
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static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de) |
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{ |
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CHKCOND(le16_to_cpu(de->length)>=0x20 && le16_to_cpu(de->length)<0x800,("HPFS: de_next_de: de->length = %x\n",(unsigned)le16_to_cpu(de->length))); |
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return (void *) de + le16_to_cpu(de->length); |
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} |
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static inline struct extended_attribute *fnode_ea(struct fnode *fnode) |
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{ |
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return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s)); |
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} |
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static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode) |
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{ |
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return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s)); |
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} |
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static unsigned ea_valuelen(struct extended_attribute *ea) |
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{ |
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return ea->valuelen_lo + 256 * ea->valuelen_hi; |
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} |
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static inline struct extended_attribute *next_ea(struct extended_attribute *ea) |
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{ |
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return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea)); |
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} |
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static inline secno ea_sec(struct extended_attribute *ea) |
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{ |
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return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 9 + ea->namelen))); |
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} |
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static inline secno ea_len(struct extended_attribute *ea) |
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{ |
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return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 5 + ea->namelen))); |
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} |
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static inline char *ea_data(struct extended_attribute *ea) |
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{ |
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return (char *)((char *)ea + 5 + ea->namelen); |
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} |
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static inline unsigned de_size(int namelen, secno down_ptr) |
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{ |
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return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0); |
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} |
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static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src) |
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{ |
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int a; |
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int n; |
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if (!dst || !src) return; |
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a = dst->down; |
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n = dst->not_8x3; |
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memcpy((char *)dst + 2, (char *)src + 2, 28); |
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dst->down = a; |
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dst->not_8x3 = n; |
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} |
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static inline unsigned tstbits(__le32 *bmp, unsigned b, unsigned n) |
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{ |
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int i; |
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if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n; |
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if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1; |
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for (i = 1; i < n; i++) |
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if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1)) |
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return i + 1; |
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return 0; |
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} |
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/* alloc.c */ |
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int hpfs_chk_sectors(struct super_block *, secno, int, char *); |
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secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int); |
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int hpfs_alloc_if_possible(struct super_block *, secno); |
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void hpfs_free_sectors(struct super_block *, secno, unsigned); |
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int hpfs_check_free_dnodes(struct super_block *, int); |
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void hpfs_free_dnode(struct super_block *, secno); |
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struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *); |
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struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **); |
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struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **); |
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int hpfs_trim_fs(struct super_block *, u64, u64, u64, unsigned *); |
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/* anode.c */ |
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secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *); |
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secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned); |
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void hpfs_remove_btree(struct super_block *, struct bplus_header *); |
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int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *); |
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int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *); |
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void hpfs_ea_remove(struct super_block *, secno, int, unsigned); |
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void hpfs_truncate_btree(struct super_block *, secno, int, unsigned); |
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void hpfs_remove_fnode(struct super_block *, fnode_secno fno); |
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/* buffer.c */ |
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secno hpfs_search_hotfix_map(struct super_block *s, secno sec); |
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unsigned hpfs_search_hotfix_map_for_range(struct super_block *s, secno sec, unsigned n); |
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void hpfs_prefetch_sectors(struct super_block *, unsigned, int); |
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void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int); |
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void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **); |
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void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int); |
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void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *); |
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void hpfs_brelse4(struct quad_buffer_head *); |
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void hpfs_mark_4buffers_dirty(struct quad_buffer_head *); |
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/* dentry.c */ |
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extern const struct dentry_operations hpfs_dentry_operations; |
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/* dir.c */ |
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struct dentry *hpfs_lookup(struct inode *, struct dentry *, unsigned int); |
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extern const struct file_operations hpfs_dir_ops; |
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/* dnode.c */ |
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int hpfs_add_pos(struct inode *, loff_t *); |
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void hpfs_del_pos(struct inode *, loff_t *); |
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struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, |
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const unsigned char *, unsigned, secno); |
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int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned, |
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struct hpfs_dirent *); |
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int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int); |
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void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *); |
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dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno); |
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struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *); |
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struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, |
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const unsigned char *, unsigned, dnode_secno *, |
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struct quad_buffer_head *); |
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void hpfs_remove_dtree(struct super_block *, dnode_secno); |
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struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *); |
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/* ea.c */ |
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void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned); |
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int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int); |
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char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *); |
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void hpfs_set_ea(struct inode *, struct fnode *, const char *, |
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const char *, int); |
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/* file.c */ |
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int hpfs_file_fsync(struct file *, loff_t, loff_t, int); |
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void hpfs_truncate(struct inode *); |
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extern const struct file_operations hpfs_file_ops; |
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extern const struct inode_operations hpfs_file_iops; |
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extern const struct address_space_operations hpfs_aops; |
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/* inode.c */ |
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void hpfs_init_inode(struct inode *); |
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void hpfs_read_inode(struct inode *); |
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void hpfs_write_inode(struct inode *); |
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void hpfs_write_inode_nolock(struct inode *); |
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int hpfs_setattr(struct user_namespace *, struct dentry *, struct iattr *); |
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void hpfs_write_if_changed(struct inode *); |
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void hpfs_evict_inode(struct inode *); |
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/* map.c */ |
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__le32 *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *); |
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__le32 *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *); |
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void hpfs_prefetch_bitmap(struct super_block *, unsigned); |
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unsigned char *hpfs_load_code_page(struct super_block *, secno); |
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__le32 *hpfs_load_bitmap_directory(struct super_block *, secno bmp); |
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void hpfs_load_hotfix_map(struct super_block *s, struct hpfs_spare_block *spareblock); |
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struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **); |
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struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **); |
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struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *); |
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dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino); |
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/* name.c */ |
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unsigned char hpfs_upcase(unsigned char *, unsigned char); |
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int hpfs_chk_name(const unsigned char *, unsigned *); |
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unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int); |
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int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned, |
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const unsigned char *, unsigned, int); |
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int hpfs_is_name_long(const unsigned char *, unsigned); |
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void hpfs_adjust_length(const unsigned char *, unsigned *); |
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/* namei.c */ |
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extern const struct inode_operations hpfs_dir_iops; |
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extern const struct address_space_operations hpfs_symlink_aops; |
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static inline struct hpfs_inode_info *hpfs_i(struct inode *inode) |
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{ |
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return container_of(inode, struct hpfs_inode_info, vfs_inode); |
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} |
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static inline struct hpfs_sb_info *hpfs_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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/* super.c */ |
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__printf(2, 3) |
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void hpfs_error(struct super_block *, const char *, ...); |
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int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *); |
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unsigned hpfs_get_free_dnodes(struct super_block *); |
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long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg); |
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/* |
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* local time (HPFS) to GMT (Unix) |
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*/ |
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static inline time64_t local_to_gmt(struct super_block *s, time64_t t) |
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{ |
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extern struct timezone sys_tz; |
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return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift; |
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} |
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static inline time32_t gmt_to_local(struct super_block *s, time64_t t) |
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{ |
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extern struct timezone sys_tz; |
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return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift; |
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} |
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static inline time32_t local_get_seconds(struct super_block *s) |
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{ |
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return gmt_to_local(s, ktime_get_real_seconds()); |
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} |
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/* |
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* Locking: |
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* |
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* hpfs_lock() locks the whole filesystem. It must be taken |
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* on any method called by the VFS. |
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* |
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* We don't do any per-file locking anymore, it is hard to |
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* review and HPFS is not performance-sensitive anyway. |
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*/ |
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static inline void hpfs_lock(struct super_block *s) |
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{ |
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struct hpfs_sb_info *sbi = hpfs_sb(s); |
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mutex_lock(&sbi->hpfs_mutex); |
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} |
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static inline void hpfs_unlock(struct super_block *s) |
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{ |
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struct hpfs_sb_info *sbi = hpfs_sb(s); |
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mutex_unlock(&sbi->hpfs_mutex); |
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} |
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static inline void hpfs_lock_assert(struct super_block *s) |
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{ |
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struct hpfs_sb_info *sbi = hpfs_sb(s); |
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WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex)); |
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}
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