^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/inode.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) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/writeback.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include "adfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Lookup/Create a block at offset 'block' into 'inode'. We currently do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * not support creation of new blocks, so we return -EIO for this case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) adfs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) int create)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) if (!create) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) if (block >= inode->i_blocks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) goto abort_toobig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) block = __adfs_block_map(inode->i_sb, ADFS_I(inode)->indaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) if (block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) map_bh(bh, inode->i_sb, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) /* don't support allocation of blocks yet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) abort_toobig:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static int adfs_writepage(struct page *page, struct writeback_control *wbc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) return block_write_full_page(page, adfs_get_block, wbc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static int adfs_readpage(struct file *file, struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return block_read_full_page(page, adfs_get_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static void adfs_write_failed(struct address_space *mapping, loff_t to)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct inode *inode = mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (to > inode->i_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) truncate_pagecache(inode, inode->i_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static int adfs_write_begin(struct file *file, struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) loff_t pos, unsigned len, unsigned flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) struct page **pagep, void **fsdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) *pagep = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) adfs_get_block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) &ADFS_I(mapping->host)->mmu_private);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (unlikely(ret))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) adfs_write_failed(mapping, pos + len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static sector_t _adfs_bmap(struct address_space *mapping, sector_t block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return generic_block_bmap(mapping, block, adfs_get_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static const struct address_space_operations adfs_aops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) .readpage = adfs_readpage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) .writepage = adfs_writepage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) .write_begin = adfs_write_begin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) .write_end = generic_write_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) .bmap = _adfs_bmap
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * Convert ADFS attributes and filetype to Linux permission.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) static umode_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) adfs_atts2mode(struct super_block *sb, struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) unsigned int attr = ADFS_I(inode)->attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) umode_t mode, rmask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) struct adfs_sb_info *asb = ADFS_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (attr & ADFS_NDA_DIRECTORY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) mode = S_IRUGO & asb->s_owner_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return S_IFDIR | S_IXUGO | mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) switch (adfs_filetype(ADFS_I(inode)->loadaddr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) case 0xfc0: /* LinkFS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return S_IFLNK|S_IRWXUGO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) case 0xfe6: /* UnixExec */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) rmask = S_IRUGO | S_IXUGO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) rmask = S_IRUGO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) mode = S_IFREG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (attr & ADFS_NDA_OWNER_READ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) mode |= rmask & asb->s_owner_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (attr & ADFS_NDA_OWNER_WRITE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) mode |= S_IWUGO & asb->s_owner_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (attr & ADFS_NDA_PUBLIC_READ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) mode |= rmask & asb->s_other_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (attr & ADFS_NDA_PUBLIC_WRITE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) mode |= S_IWUGO & asb->s_other_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * Convert Linux permission to ADFS attribute. We try to do the reverse
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * of atts2mode, but there is not a 1:1 translation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static int adfs_mode2atts(struct super_block *sb, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) umode_t ia_mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) struct adfs_sb_info *asb = ADFS_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) umode_t mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) int attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /* FIXME: should we be able to alter a link? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) if (S_ISLNK(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return ADFS_I(inode)->attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /* Directories do not have read/write permissions on the media */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (S_ISDIR(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return ADFS_NDA_DIRECTORY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) attr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) mode = ia_mode & asb->s_owner_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (mode & S_IRUGO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) attr |= ADFS_NDA_OWNER_READ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (mode & S_IWUGO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) attr |= ADFS_NDA_OWNER_WRITE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) mode = ia_mode & asb->s_other_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) mode &= ~asb->s_owner_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) if (mode & S_IRUGO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) attr |= ADFS_NDA_PUBLIC_READ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (mode & S_IWUGO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) attr |= ADFS_NDA_PUBLIC_WRITE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) return attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static const s64 nsec_unix_epoch_diff_risc_os_epoch = 2208988800000000000LL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * Convert an ADFS time to Unix time. ADFS has a 40-bit centi-second time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * referenced to 1 Jan 1900 (til 2248) so we need to discard 2208988800 seconds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) * of time to convert from RISC OS epoch to Unix epoch.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) adfs_adfs2unix_time(struct timespec64 *tv, struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) unsigned int high, low;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) /* 01 Jan 1970 00:00:00 (Unix epoch) as nanoseconds since
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * 01 Jan 1900 00:00:00 (RISC OS epoch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) s64 nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if (!adfs_inode_is_stamped(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) goto cur_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) high = ADFS_I(inode)->loadaddr & 0xFF; /* top 8 bits of timestamp */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) low = ADFS_I(inode)->execaddr; /* bottom 32 bits of timestamp */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) /* convert 40-bit centi-seconds to 32-bit seconds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) * going via nanoseconds to retain precision
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) nsec = (((s64) high << 32) | (s64) low) * 10000000; /* cs to ns */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) /* Files dated pre 01 Jan 1970 00:00:00. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) if (nsec < nsec_unix_epoch_diff_risc_os_epoch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) goto too_early;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) /* convert from RISC OS to Unix epoch */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) nsec -= nsec_unix_epoch_diff_risc_os_epoch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) *tv = ns_to_timespec64(nsec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) cur_time:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) *tv = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) too_early:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) tv->tv_sec = tv->tv_nsec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) /* Convert an Unix time to ADFS time for an entry that is already stamped. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) static void adfs_unix2adfs_time(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) const struct timespec64 *ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) s64 cs, nsec = timespec64_to_ns(ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) /* convert from Unix to RISC OS epoch */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) nsec += nsec_unix_epoch_diff_risc_os_epoch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) /* convert from nanoseconds to centiseconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) cs = div_s64(nsec, 10000000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) cs = clamp_t(s64, cs, 0, 0xffffffffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) ADFS_I(inode)->loadaddr &= ~0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) ADFS_I(inode)->loadaddr |= (cs >> 32) & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) ADFS_I(inode)->execaddr = cs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) * Fill in the inode information from the object information.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) * Note that this is an inode-less filesystem, so we can't use the inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) * number to reference the metadata on the media. Instead, we use the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) * inode number to hold the object ID, which in turn will tell us where
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) * the data is held. We also save the parent object ID, and with these
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) * two, we can locate the metadata.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) * This does mean that we rely on an objects parent remaining the same at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) * all times - we cannot cope with a cross-directory rename (yet).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) struct inode *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) adfs_iget(struct super_block *sb, struct object_info *obj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) inode = new_inode(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (!inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) inode->i_uid = ADFS_SB(sb)->s_uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) inode->i_gid = ADFS_SB(sb)->s_gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) inode->i_ino = obj->indaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) inode->i_size = obj->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) set_nlink(inode, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) inode->i_blocks = (inode->i_size + sb->s_blocksize - 1) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) sb->s_blocksize_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) * we need to save the parent directory ID so that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) * write_inode can update the directory information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) * for this file. This will need special handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * for cross-directory renames.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) ADFS_I(inode)->parent_id = obj->parent_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) ADFS_I(inode)->indaddr = obj->indaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) ADFS_I(inode)->loadaddr = obj->loadaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) ADFS_I(inode)->execaddr = obj->execaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) ADFS_I(inode)->attr = obj->attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) inode->i_mode = adfs_atts2mode(sb, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) adfs_adfs2unix_time(&inode->i_mtime, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) inode->i_atime = inode->i_mtime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) inode->i_ctime = inode->i_mtime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (S_ISDIR(inode->i_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) inode->i_op = &adfs_dir_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) inode->i_fop = &adfs_dir_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) } else if (S_ISREG(inode->i_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) inode->i_op = &adfs_file_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) inode->i_fop = &adfs_file_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) inode->i_mapping->a_ops = &adfs_aops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) ADFS_I(inode)->mmu_private = inode->i_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) inode_fake_hash(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * Validate and convert a changed access mode/time to their ADFS equivalents.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) * adfs_write_inode will actually write the information back to the directory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) * later.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) adfs_notify_change(struct dentry *dentry, struct iattr *attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) struct inode *inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) unsigned int ia_valid = attr->ia_valid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) error = setattr_prepare(dentry, attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) * we can't change the UID or GID of any file -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) * we have a global UID/GID in the superblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, ADFS_SB(sb)->s_uid)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) (ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, ADFS_SB(sb)->s_gid)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) error = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) /* XXX: this is missing some actual on-disk truncation.. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) if (ia_valid & ATTR_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) truncate_setsize(inode, attr->ia_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (ia_valid & ATTR_MTIME && adfs_inode_is_stamped(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) adfs_unix2adfs_time(inode, &attr->ia_mtime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) adfs_adfs2unix_time(&inode->i_mtime, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) * FIXME: should we make these == to i_mtime since we don't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) * have the ability to represent them in our filesystem?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) if (ia_valid & ATTR_ATIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) inode->i_atime = attr->ia_atime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) if (ia_valid & ATTR_CTIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) inode->i_ctime = attr->ia_ctime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) if (ia_valid & ATTR_MODE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) ADFS_I(inode)->attr = adfs_mode2atts(sb, inode, attr->ia_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) inode->i_mode = adfs_atts2mode(sb, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) * FIXME: should we be marking this inode dirty even if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) * we don't have any metadata to write back?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) if (ia_valid & (ATTR_SIZE | ATTR_MTIME | ATTR_MODE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) * write an existing inode back to the directory, and therefore the disk.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) * The adfs-specific inode data has already been updated by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) * adfs_notify_change()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) int adfs_write_inode(struct inode *inode, struct writeback_control *wbc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) struct object_info obj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) obj.indaddr = ADFS_I(inode)->indaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) obj.name_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) obj.parent_id = ADFS_I(inode)->parent_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) obj.loadaddr = ADFS_I(inode)->loadaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) obj.execaddr = ADFS_I(inode)->execaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) obj.attr = ADFS_I(inode)->attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) obj.size = inode->i_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) ret = adfs_dir_update(sb, &obj, wbc->sync_mode == WB_SYNC_ALL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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