d2912cb15bdda (Thomas Gleixner 2019-06-04 10:11:33 +0200 1) // SPDX-License-Identifier: GPL-2.0-only
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 2) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 3) * linux/fs/adfs/dir_f.c
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 4) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 5) * Copyright (C) 1997-1999 Russell King
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 6) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 7) * E and F format directory handling
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 8) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 9) #include "adfs.h"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 10) #include "dir_f.h"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 11)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 12) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 13) * Read an (unaligned) value of length 1..4 bytes
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 14) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 15) static inline unsigned int adfs_readval(unsigned char *p, int len)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 16) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 17) unsigned int val = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 18)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 19) switch (len) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 20) case 4: val |= p[3] << 24;
df561f6688fef (Gustavo A. R. Silva 2020-08-23 17:36:59 -0500 21) fallthrough;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 22) case 3: val |= p[2] << 16;
df561f6688fef (Gustavo A. R. Silva 2020-08-23 17:36:59 -0500 23) fallthrough;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 24) case 2: val |= p[1] << 8;
df561f6688fef (Gustavo A. R. Silva 2020-08-23 17:36:59 -0500 25) fallthrough;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 26) default: val |= p[0];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 27) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 28) return val;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 29) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 30)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 31) static inline void adfs_writeval(unsigned char *p, int len, unsigned int val)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 32) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 33) switch (len) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 34) case 4: p[3] = val >> 24;
df561f6688fef (Gustavo A. R. Silva 2020-08-23 17:36:59 -0500 35) fallthrough;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 36) case 3: p[2] = val >> 16;
df561f6688fef (Gustavo A. R. Silva 2020-08-23 17:36:59 -0500 37) fallthrough;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 38) case 2: p[1] = val >> 8;
df561f6688fef (Gustavo A. R. Silva 2020-08-23 17:36:59 -0500 39) fallthrough;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 40) default: p[0] = val;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 41) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 42) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 43)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 44) #define ror13(v) ((v >> 13) | (v << 19))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 45)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 46) #define dir_u8(idx) \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 47) ({ int _buf = idx >> blocksize_bits; \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 48) int _off = idx - (_buf << blocksize_bits);\
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 49) *(u8 *)(bh[_buf]->b_data + _off); \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 50) })
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 51)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 52) #define dir_u32(idx) \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 53) ({ int _buf = idx >> blocksize_bits; \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 54) int _off = idx - (_buf << blocksize_bits);\
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 55) *(__le32 *)(bh[_buf]->b_data + _off); \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 56) })
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 57)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 58) #define bufoff(_bh,_idx) \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 59) ({ int _buf = _idx >> blocksize_bits; \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 60) int _off = _idx - (_buf << blocksize_bits);\
016936b32131d (Russell King 2019-12-09 11:10:21 +0000 61) (void *)(_bh[_buf]->b_data + _off); \
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 62) })
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 63)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 64) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 65) * There are some algorithms that are nice in
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 66) * assembler, but a bitch in C... This is one
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 67) * of them.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 68) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 69) static u8
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 70) adfs_dir_checkbyte(const struct adfs_dir *dir)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 71) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 72) struct buffer_head * const *bh = dir->bh;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 73) const int blocksize_bits = dir->sb->s_blocksize_bits;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 74) union { __le32 *ptr32; u8 *ptr8; } ptr, end;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 75) u32 dircheck = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 76) int last = 5 - 26;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 77) int i = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 78)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 79) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 80) * Accumulate each word up to the last whole
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 81) * word of the last directory entry. This
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 82) * can spread across several buffer heads.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 83) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 84) do {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 85) last += 26;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 86) do {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 87) dircheck = le32_to_cpu(dir_u32(i)) ^ ror13(dircheck);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 88)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 89) i += sizeof(u32);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 90) } while (i < (last & ~3));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 91) } while (dir_u8(last) != 0);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 92)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 93) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 94) * Accumulate the last few bytes. These
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 95) * bytes will be within the same bh.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 96) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 97) if (i != last) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 98) ptr.ptr8 = bufoff(bh, i);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 99) end.ptr8 = ptr.ptr8 + last - i;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 100)
e5949050f2610 (Harvey Harrison 2008-04-29 00:58:41 -0700 101) do {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 102) dircheck = *ptr.ptr8++ ^ ror13(dircheck);
e5949050f2610 (Harvey Harrison 2008-04-29 00:58:41 -0700 103) } while (ptr.ptr8 < end.ptr8);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 104) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 105)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 106) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 107) * The directory tail is in the final bh
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 108) * Note that contary to the RISC OS PRMs,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 109) * the first few bytes are NOT included
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 110) * in the check. All bytes are in the
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 111) * same bh.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 112) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 113) ptr.ptr8 = bufoff(bh, 2008);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 114) end.ptr8 = ptr.ptr8 + 36;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 115)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 116) do {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 117) __le32 v = *ptr.ptr32++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 118) dircheck = le32_to_cpu(v) ^ ror13(dircheck);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 119) } while (ptr.ptr32 < end.ptr32);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 120)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 121) return (dircheck ^ (dircheck >> 8) ^ (dircheck >> 16) ^ (dircheck >> 24)) & 0xff;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 122) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 123)
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 124) static int adfs_f_validate(struct adfs_dir *dir)
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 125) {
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 126) struct adfs_dirheader *head = dir->dirhead;
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 127) struct adfs_newdirtail *tail = dir->newtail;
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 128)
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 129) if (head->startmasseq != tail->endmasseq ||
7a0e4048bfd16 (Russell King 2019-12-09 11:10:32 +0000 130) tail->dirlastmask || tail->reserved[0] || tail->reserved[1] ||
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 131) (memcmp(&head->startname, "Nick", 4) &&
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 132) memcmp(&head->startname, "Hugo", 4)) ||
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 133) memcmp(&head->startname, &tail->endname, 4) ||
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 134) adfs_dir_checkbyte(dir) != tail->dircheckbyte)
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 135) return -EIO;
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 136)
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 137) return 0;
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 138) }
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 139)
5ed70bb47767d (Russell King 2019-06-04 14:49:57 +0100 140) /* Read and check that a directory is valid */
9318731bec8d3 (Russell King 2019-12-09 11:10:37 +0000 141) static int adfs_f_read(struct super_block *sb, u32 indaddr, unsigned int size,
9318731bec8d3 (Russell King 2019-12-09 11:10:37 +0000 142) struct adfs_dir *dir)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 143) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 144) const unsigned int blocksize_bits = sb->s_blocksize_bits;
419a6e5e82ca0 (Russell King 2019-12-09 11:09:35 +0000 145) int ret;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 146)
9318731bec8d3 (Russell King 2019-12-09 11:10:37 +0000 147) if (size && size != ADFS_NEWDIR_SIZE)
9318731bec8d3 (Russell King 2019-12-09 11:10:37 +0000 148) return -EIO;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 149)
9318731bec8d3 (Russell King 2019-12-09 11:10:37 +0000 150) ret = adfs_dir_read_buffers(sb, indaddr, ADFS_NEWDIR_SIZE, dir);
419a6e5e82ca0 (Russell King 2019-12-09 11:09:35 +0000 151) if (ret)
419a6e5e82ca0 (Russell King 2019-12-09 11:09:35 +0000 152) return ret;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 153)
016936b32131d (Russell King 2019-12-09 11:10:21 +0000 154) dir->dirhead = bufoff(dir->bh, 0);
016936b32131d (Russell King 2019-12-09 11:10:21 +0000 155) dir->newtail = bufoff(dir->bh, 2007);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 156)
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 157) if (adfs_f_validate(dir))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 158) goto bad_dir;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 159)
9318731bec8d3 (Russell King 2019-12-09 11:10:37 +0000 160) dir->parent_id = adfs_readval(dir->newtail->dirparent, 3);
9318731bec8d3 (Russell King 2019-12-09 11:10:37 +0000 161)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 162) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 163)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 164) bad_dir:
5ed70bb47767d (Russell King 2019-06-04 14:49:57 +0100 165) adfs_error(sb, "dir %06x is corrupted", indaddr);
1dd9f5babfd95 (Russell King 2019-12-09 11:09:20 +0000 166) adfs_dir_relse(dir);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 167)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 168) return -EIO;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 169) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 170)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 171) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 172) * convert a disk-based directory entry to a Linux ADFS directory entry
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 173) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 174) static inline void
da23ef0549d42 (Stuart Swales 2011-03-22 16:35:06 -0700 175) adfs_dir2obj(struct adfs_dir *dir, struct object_info *obj,
da23ef0549d42 (Stuart Swales 2011-03-22 16:35:06 -0700 176) struct adfs_direntry *de)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 177) {
adb514a4e0f6d (Russell King 2019-03-24 13:22:28 +0000 178) unsigned int name_len;
adb514a4e0f6d (Russell King 2019-03-24 13:22:28 +0000 179)
adb514a4e0f6d (Russell King 2019-03-24 13:22:28 +0000 180) for (name_len = 0; name_len < ADFS_F_NAME_LEN; name_len++) {
adb514a4e0f6d (Russell King 2019-03-24 13:22:28 +0000 181) if (de->dirobname[name_len] < ' ')
adb514a4e0f6d (Russell King 2019-03-24 13:22:28 +0000 182) break;
adb514a4e0f6d (Russell King 2019-03-24 13:22:28 +0000 183)
adb514a4e0f6d (Russell King 2019-03-24 13:22:28 +0000 184) obj->name[name_len] = de->dirobname[name_len];
adb514a4e0f6d (Russell King 2019-03-24 13:22:28 +0000 185) }
adb514a4e0f6d (Russell King 2019-03-24 13:22:28 +0000 186)
adb514a4e0f6d (Russell King 2019-03-24 13:22:28 +0000 187) obj->name_len = name_len;
5ed70bb47767d (Russell King 2019-06-04 14:49:57 +0100 188) obj->indaddr = adfs_readval(de->dirinddiscadd, 3);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 189) obj->loadaddr = adfs_readval(de->dirload, 4);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 190) obj->execaddr = adfs_readval(de->direxec, 4);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 191) obj->size = adfs_readval(de->dirlen, 4);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 192) obj->attr = de->newdiratts;
da23ef0549d42 (Stuart Swales 2011-03-22 16:35:06 -0700 193)
411c49bcf32d3 (Russell King 2019-03-24 12:57:32 +0000 194) adfs_object_fixup(dir, obj);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 195) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 196)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 197) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 198) * convert a Linux ADFS directory entry to a disk-based directory entry
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 199) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 200) static inline void
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 201) adfs_obj2dir(struct adfs_direntry *de, struct object_info *obj)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 202) {
5ed70bb47767d (Russell King 2019-06-04 14:49:57 +0100 203) adfs_writeval(de->dirinddiscadd, 3, obj->indaddr);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 204) adfs_writeval(de->dirload, 4, obj->loadaddr);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 205) adfs_writeval(de->direxec, 4, obj->execaddr);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 206) adfs_writeval(de->dirlen, 4, obj->size);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 207) de->newdiratts = obj->attr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 208) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 209)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 210) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 211) * get a directory entry. Note that the caller is responsible
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 212) * for holding the relevant locks.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 213) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 214) static int
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 215) __adfs_dir_get(struct adfs_dir *dir, int pos, struct object_info *obj)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 216) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 217) struct adfs_direntry de;
a317120bf7f83 (Russell King 2019-12-09 11:09:30 +0000 218) int ret;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 219)
a317120bf7f83 (Russell King 2019-12-09 11:09:30 +0000 220) ret = adfs_dir_copyfrom(&de, dir, pos, 26);
a317120bf7f83 (Russell King 2019-12-09 11:09:30 +0000 221) if (ret)
a317120bf7f83 (Russell King 2019-12-09 11:09:30 +0000 222) return ret;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 223)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 224) if (!de.dirobname[0])
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 225) return -ENOENT;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 226)
da23ef0549d42 (Stuart Swales 2011-03-22 16:35:06 -0700 227) adfs_dir2obj(dir, obj, &de);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 228)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 229) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 230) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 231)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 232) static int
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 233) adfs_f_setpos(struct adfs_dir *dir, unsigned int fpos)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 234) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 235) if (fpos >= ADFS_NUM_DIR_ENTRIES)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 236) return -ENOENT;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 237)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 238) dir->pos = 5 + fpos * 26;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 239) return 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 240) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 241)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 242) static int
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 243) adfs_f_getnext(struct adfs_dir *dir, struct object_info *obj)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 244) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 245) unsigned int ret;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 246)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 247) ret = __adfs_dir_get(dir, dir->pos, obj);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 248) if (ret == 0)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 249) dir->pos += 26;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 250)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 251) return ret;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 252) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 253)
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 254) static int adfs_f_iterate(struct adfs_dir *dir, struct dir_context *ctx)
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 255) {
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 256) struct object_info obj;
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 257) int pos = 5 + (ctx->pos - 2) * 26;
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 258)
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 259) while (ctx->pos < 2 + ADFS_NUM_DIR_ENTRIES) {
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 260) if (__adfs_dir_get(dir, pos, &obj))
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 261) break;
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 262) if (!dir_emit(ctx, obj.name, obj.name_len,
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 263) obj.indaddr, DT_UNKNOWN))
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 264) break;
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 265) pos += 26;
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 266) ctx->pos++;
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 267) }
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 268) return 0;
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 269) }
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 270)
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 271) static int adfs_f_update(struct adfs_dir *dir, struct object_info *obj)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 272) {
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 273) struct adfs_direntry de;
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 274) int offset, ret;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 275)
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 276) offset = 5 - (int)sizeof(de);
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 277)
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 278) do {
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 279) offset += sizeof(de);
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 280) ret = adfs_dir_copyfrom(&de, dir, offset, sizeof(de));
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 281) if (ret) {
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 282) adfs_error(dir->sb, "error reading directory entry");
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 283) return -ENOENT;
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 284) }
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 285) if (!de.dirobname[0]) {
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 286) adfs_error(dir->sb, "unable to locate entry to update");
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 287) return -ENOENT;
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 288) }
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 289) } while (adfs_readval(de.dirinddiscadd, 3) != obj->indaddr);
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 290)
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 291) /* Update the directory entry with the new object state */
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 292) adfs_obj2dir(&de, obj);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 293)
cc625ccd0e6c2 (Russell King 2019-12-09 11:10:42 +0000 294) /* Write the directory entry back to the directory */
aacc954c1be89 (Russell King 2019-12-09 11:10:47 +0000 295) return adfs_dir_copyto(dir, offset, &de, 26);
aacc954c1be89 (Russell King 2019-12-09 11:10:47 +0000 296) }
aacc954c1be89 (Russell King 2019-12-09 11:10:47 +0000 297)
aacc954c1be89 (Russell King 2019-12-09 11:10:47 +0000 298) static int adfs_f_commit(struct adfs_dir *dir)
aacc954c1be89 (Russell King 2019-12-09 11:10:47 +0000 299) {
aacc954c1be89 (Russell King 2019-12-09 11:10:47 +0000 300) int ret;
aacc954c1be89 (Russell King 2019-12-09 11:10:47 +0000 301)
aacc954c1be89 (Russell King 2019-12-09 11:10:47 +0000 302) /* Increment directory sequence number */
016936b32131d (Russell King 2019-12-09 11:10:21 +0000 303) dir->dirhead->startmasseq += 1;
016936b32131d (Russell King 2019-12-09 11:10:21 +0000 304) dir->newtail->endmasseq += 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 305)
aacc954c1be89 (Russell King 2019-12-09 11:10:47 +0000 306) /* Update directory check byte */
aacc954c1be89 (Russell King 2019-12-09 11:10:47 +0000 307) dir->newtail->dircheckbyte = adfs_dir_checkbyte(dir);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 308)
aacc954c1be89 (Russell King 2019-12-09 11:10:47 +0000 309) /* Make sure the directory still validates correctly */
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 310) ret = adfs_f_validate(dir);
ffc8df347e493 (Russell King 2019-12-09 11:10:27 +0000 311) if (ret)
aacc954c1be89 (Russell King 2019-12-09 11:10:47 +0000 312) adfs_msg(dir->sb, KERN_ERR, "error: update broke directory");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 313)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 314) return ret;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 315) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 316)
0125f504ed320 (Julia Lawall 2015-11-21 16:15:37 +0100 317) const struct adfs_dir_ops adfs_f_dir_ops = {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 318) .read = adfs_f_read,
4287e4deb1280 (Russell King 2019-12-09 11:10:16 +0000 319) .iterate = adfs_f_iterate,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 320) .setpos = adfs_f_setpos,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 321) .getnext = adfs_f_getnext,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 322) .update = adfs_f_update,
aacc954c1be89 (Russell King 2019-12-09 11:10:47 +0000 323) .commit = adfs_f_commit,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 324) };
VisionFive2 Linux kernel
StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)
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