Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *  linux/fs/adfs/dir_f.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 1997-1999 Russell King
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *  E and F format directory handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include "adfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include "dir_f.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * Read an (unaligned) value of length 1..4 bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) static inline unsigned int adfs_readval(unsigned char *p, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	unsigned int val = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	switch (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	case 4:		val |= p[3] << 24;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 		fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	case 3:		val |= p[2] << 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 		fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	case 2:		val |= p[1] << 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 		fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	default:	val |= p[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	return val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) static inline void adfs_writeval(unsigned char *p, int len, unsigned int val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	switch (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	case 4:		p[3] = val >> 24;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 		fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	case 3:		p[2] = val >> 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	case 2:		p[1] = val >> 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	default:	p[0] = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #define ror13(v) ((v >> 13) | (v << 19))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) #define dir_u8(idx)				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	({ int _buf = idx >> blocksize_bits;	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	   int _off = idx - (_buf << blocksize_bits);\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	  *(u8 *)(bh[_buf]->b_data + _off);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	})
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) #define dir_u32(idx)				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	({ int _buf = idx >> blocksize_bits;	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	   int _off = idx - (_buf << blocksize_bits);\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	  *(__le32 *)(bh[_buf]->b_data + _off);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	})
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) #define bufoff(_bh,_idx)			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	({ int _buf = _idx >> blocksize_bits;	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	   int _off = _idx - (_buf << blocksize_bits);\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	  (void *)(_bh[_buf]->b_data + _off);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	})
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65)  * There are some algorithms that are nice in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66)  * assembler, but a bitch in C...  This is one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67)  * of them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) static u8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) adfs_dir_checkbyte(const struct adfs_dir *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	struct buffer_head * const *bh = dir->bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	const int blocksize_bits = dir->sb->s_blocksize_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	union { __le32 *ptr32; u8 *ptr8; } ptr, end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	u32 dircheck = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	int last = 5 - 26;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	int i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	 * Accumulate each word up to the last whole
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	 * word of the last directory entry.  This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	 * can spread across several buffer heads.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		last += 26;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 			dircheck = le32_to_cpu(dir_u32(i)) ^ ror13(dircheck);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 			i += sizeof(u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		} while (i < (last & ~3));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	} while (dir_u8(last) != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	 * Accumulate the last few bytes.  These
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	 * bytes will be within the same bh.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	if (i != last) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		ptr.ptr8 = bufoff(bh, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		end.ptr8 = ptr.ptr8 + last - i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 			dircheck = *ptr.ptr8++ ^ ror13(dircheck);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		} while (ptr.ptr8 < end.ptr8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	 * The directory tail is in the final bh
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	 * Note that contary to the RISC OS PRMs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	 * the first few bytes are NOT included
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	 * in the check.  All bytes are in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	 * same bh.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	ptr.ptr8 = bufoff(bh, 2008);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	end.ptr8 = ptr.ptr8 + 36;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		__le32 v = *ptr.ptr32++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		dircheck = le32_to_cpu(v) ^ ror13(dircheck);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	} while (ptr.ptr32 < end.ptr32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	return (dircheck ^ (dircheck >> 8) ^ (dircheck >> 16) ^ (dircheck >> 24)) & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static int adfs_f_validate(struct adfs_dir *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	struct adfs_dirheader *head = dir->dirhead;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	struct adfs_newdirtail *tail = dir->newtail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	if (head->startmasseq != tail->endmasseq ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	    tail->dirlastmask || tail->reserved[0] || tail->reserved[1] ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	    (memcmp(&head->startname, "Nick", 4) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	     memcmp(&head->startname, "Hugo", 4)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	    memcmp(&head->startname, &tail->endname, 4) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	    adfs_dir_checkbyte(dir) != tail->dircheckbyte)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) /* Read and check that a directory is valid */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static int adfs_f_read(struct super_block *sb, u32 indaddr, unsigned int size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		       struct adfs_dir *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	const unsigned int blocksize_bits = sb->s_blocksize_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	if (size && size != ADFS_NEWDIR_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	ret = adfs_dir_read_buffers(sb, indaddr, ADFS_NEWDIR_SIZE, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	dir->dirhead = bufoff(dir->bh, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	dir->newtail = bufoff(dir->bh, 2007);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	if (adfs_f_validate(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		goto bad_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	dir->parent_id = adfs_readval(dir->newtail->dirparent, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) bad_dir:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	adfs_error(sb, "dir %06x is corrupted", indaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	adfs_dir_relse(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)  * convert a disk-based directory entry to a Linux ADFS directory entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) adfs_dir2obj(struct adfs_dir *dir, struct object_info *obj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	struct adfs_direntry *de)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	unsigned int name_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	for (name_len = 0; name_len < ADFS_F_NAME_LEN; name_len++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		if (de->dirobname[name_len] < ' ')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		obj->name[name_len] = de->dirobname[name_len];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	obj->name_len =	name_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	obj->indaddr  = adfs_readval(de->dirinddiscadd, 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	obj->loadaddr = adfs_readval(de->dirload, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	obj->execaddr = adfs_readval(de->direxec, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	obj->size     = adfs_readval(de->dirlen,  4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	obj->attr     = de->newdiratts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	adfs_object_fixup(dir, obj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)  * convert a Linux ADFS directory entry to a disk-based directory entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) adfs_obj2dir(struct adfs_direntry *de, struct object_info *obj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	adfs_writeval(de->dirinddiscadd, 3, obj->indaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	adfs_writeval(de->dirload, 4, obj->loadaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	adfs_writeval(de->direxec, 4, obj->execaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	adfs_writeval(de->dirlen,  4, obj->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	de->newdiratts = obj->attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)  * get a directory entry.  Note that the caller is responsible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)  * for holding the relevant locks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) __adfs_dir_get(struct adfs_dir *dir, int pos, struct object_info *obj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	struct adfs_direntry de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	ret = adfs_dir_copyfrom(&de, dir, pos, 26);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	if (!de.dirobname[0])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	adfs_dir2obj(dir, obj, &de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) adfs_f_setpos(struct adfs_dir *dir, unsigned int fpos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	if (fpos >= ADFS_NUM_DIR_ENTRIES)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	dir->pos = 5 + fpos * 26;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) adfs_f_getnext(struct adfs_dir *dir, struct object_info *obj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	unsigned int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	ret = __adfs_dir_get(dir, dir->pos, obj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		dir->pos += 26;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static int adfs_f_iterate(struct adfs_dir *dir, struct dir_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	struct object_info obj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	int pos = 5 + (ctx->pos - 2) * 26;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	while (ctx->pos < 2 + ADFS_NUM_DIR_ENTRIES) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		if (__adfs_dir_get(dir, pos, &obj))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		if (!dir_emit(ctx, obj.name, obj.name_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 			      obj.indaddr, DT_UNKNOWN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		pos += 26;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		ctx->pos++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) static int adfs_f_update(struct adfs_dir *dir, struct object_info *obj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	struct adfs_direntry de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	int offset, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	offset = 5 - (int)sizeof(de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		offset += sizeof(de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		ret = adfs_dir_copyfrom(&de, dir, offset, sizeof(de));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 			adfs_error(dir->sb, "error reading directory entry");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 			return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		if (!de.dirobname[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			adfs_error(dir->sb, "unable to locate entry to update");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 			return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	} while (adfs_readval(de.dirinddiscadd, 3) != obj->indaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	/* Update the directory entry with the new object state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	adfs_obj2dir(&de, obj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	/* Write the directory entry back to the directory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	return adfs_dir_copyto(dir, offset, &de, 26);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) static int adfs_f_commit(struct adfs_dir *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	/* Increment directory sequence number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	dir->dirhead->startmasseq += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	dir->newtail->endmasseq += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	/* Update directory check byte */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	dir->newtail->dircheckbyte = adfs_dir_checkbyte(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	/* Make sure the directory still validates correctly */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	ret = adfs_f_validate(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		adfs_msg(dir->sb, KERN_ERR, "error: update broke directory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) const struct adfs_dir_ops adfs_f_dir_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	.read		= adfs_f_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	.iterate	= adfs_f_iterate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	.setpos		= adfs_f_setpos,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	.getnext	= adfs_f_getnext,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	.update		= adfs_f_update,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	.commit		= adfs_f_commit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) };