Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * linux/fs/adfs/inode.c |
| 4 | * |
| 5 | * Copyright (C) 1997-1999 Russell King |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | #include <linux/buffer_head.h> |
Matthew Wilcox (Oracle) | 81d469d | 2023-12-15 20:02:36 +0000 | [diff] [blame] | 8 | #include <linux/mpage.h> |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 9 | #include <linux/writeback.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include "adfs.h" |
| 11 | |
| 12 | /* |
| 13 | * Lookup/Create a block at offset 'block' into 'inode'. We currently do |
| 14 | * not support creation of new blocks, so we return -EIO for this case. |
| 15 | */ |
| 16 | static int |
| 17 | adfs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh, |
| 18 | int create) |
| 19 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | if (!create) { |
| 21 | if (block >= inode->i_blocks) |
| 22 | goto abort_toobig; |
| 23 | |
Russell King | 25e5d4d | 2019-12-09 11:11:38 +0000 | [diff] [blame] | 24 | block = __adfs_block_map(inode->i_sb, ADFS_I(inode)->indaddr, |
| 25 | block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | if (block) |
| 27 | map_bh(bh, inode->i_sb, block); |
| 28 | return 0; |
| 29 | } |
| 30 | /* don't support allocation of blocks yet */ |
| 31 | return -EIO; |
| 32 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | abort_toobig: |
| 34 | return 0; |
| 35 | } |
| 36 | |
Matthew Wilcox (Oracle) | 81d469d | 2023-12-15 20:02:36 +0000 | [diff] [blame] | 37 | static int adfs_writepages(struct address_space *mapping, |
| 38 | struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | { |
Matthew Wilcox (Oracle) | 81d469d | 2023-12-15 20:02:36 +0000 | [diff] [blame] | 40 | return mpage_writepages(mapping, wbc, adfs_get_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | } |
| 42 | |
Matthew Wilcox (Oracle) | 2c69e20 | 2022-04-29 10:40:40 -0400 | [diff] [blame] | 43 | static int adfs_read_folio(struct file *file, struct folio *folio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | { |
Matthew Wilcox (Oracle) | 2c69e20 | 2022-04-29 10:40:40 -0400 | [diff] [blame] | 45 | return block_read_full_folio(folio, adfs_get_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | } |
| 47 | |
Marco Stornelli | 6229518 | 2012-12-15 11:51:11 +0100 | [diff] [blame] | 48 | static void adfs_write_failed(struct address_space *mapping, loff_t to) |
| 49 | { |
| 50 | struct inode *inode = mapping->host; |
| 51 | |
| 52 | if (to > inode->i_size) |
Kirill A. Shutemov | 7caef26 | 2013-09-12 15:13:56 -0700 | [diff] [blame] | 53 | truncate_pagecache(inode, inode->i_size); |
Marco Stornelli | 6229518 | 2012-12-15 11:51:11 +0100 | [diff] [blame] | 54 | } |
| 55 | |
Nick Piggin | b458572 | 2007-10-16 01:25:23 -0700 | [diff] [blame] | 56 | static int adfs_write_begin(struct file *file, struct address_space *mapping, |
Matthew Wilcox (Oracle) | 9d6b0cd | 2022-02-22 14:31:43 -0500 | [diff] [blame] | 57 | loff_t pos, unsigned len, |
Nick Piggin | b458572 | 2007-10-16 01:25:23 -0700 | [diff] [blame] | 58 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | { |
Christoph Hellwig | 282dc17 | 2010-06-04 11:29:55 +0200 | [diff] [blame] | 60 | int ret; |
| 61 | |
Nick Piggin | b458572 | 2007-10-16 01:25:23 -0700 | [diff] [blame] | 62 | *pagep = NULL; |
Matthew Wilcox (Oracle) | be3bbbc | 2022-02-22 11:25:12 -0500 | [diff] [blame] | 63 | ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata, |
Nick Piggin | b458572 | 2007-10-16 01:25:23 -0700 | [diff] [blame] | 64 | adfs_get_block, |
| 65 | &ADFS_I(mapping->host)->mmu_private); |
Marco Stornelli | 6229518 | 2012-12-15 11:51:11 +0100 | [diff] [blame] | 66 | if (unlikely(ret)) |
| 67 | adfs_write_failed(mapping, pos + len); |
Christoph Hellwig | 282dc17 | 2010-06-04 11:29:55 +0200 | [diff] [blame] | 68 | |
| 69 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | static sector_t _adfs_bmap(struct address_space *mapping, sector_t block) |
| 73 | { |
| 74 | return generic_block_bmap(mapping, block, adfs_get_block); |
| 75 | } |
| 76 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 77 | static const struct address_space_operations adfs_aops = { |
Matthew Wilcox (Oracle) | e621900 | 2022-02-09 20:22:12 +0000 | [diff] [blame] | 78 | .dirty_folio = block_dirty_folio, |
Matthew Wilcox (Oracle) | 7ba13ab | 2022-02-09 20:21:34 +0000 | [diff] [blame] | 79 | .invalidate_folio = block_invalidate_folio, |
Matthew Wilcox (Oracle) | 2c69e20 | 2022-04-29 10:40:40 -0400 | [diff] [blame] | 80 | .read_folio = adfs_read_folio, |
Matthew Wilcox (Oracle) | 81d469d | 2023-12-15 20:02:36 +0000 | [diff] [blame] | 81 | .writepages = adfs_writepages, |
Nick Piggin | b458572 | 2007-10-16 01:25:23 -0700 | [diff] [blame] | 82 | .write_begin = adfs_write_begin, |
| 83 | .write_end = generic_write_end, |
Matthew Wilcox (Oracle) | 81d469d | 2023-12-15 20:02:36 +0000 | [diff] [blame] | 84 | .migrate_folio = buffer_migrate_folio, |
| 85 | .bmap = _adfs_bmap, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | }; |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | /* |
| 89 | * Convert ADFS attributes and filetype to Linux permission. |
| 90 | */ |
| 91 | static umode_t |
| 92 | adfs_atts2mode(struct super_block *sb, struct inode *inode) |
| 93 | { |
Stuart Swales | da23ef0 | 2011-03-22 16:35:06 -0700 | [diff] [blame] | 94 | unsigned int attr = ADFS_I(inode)->attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | umode_t mode, rmask; |
| 96 | struct adfs_sb_info *asb = ADFS_SB(sb); |
| 97 | |
| 98 | if (attr & ADFS_NDA_DIRECTORY) { |
| 99 | mode = S_IRUGO & asb->s_owner_mask; |
| 100 | return S_IFDIR | S_IXUGO | mode; |
| 101 | } |
| 102 | |
Russell King | b4ed8f7 | 2019-06-04 14:50:24 +0100 | [diff] [blame] | 103 | switch (adfs_filetype(ADFS_I(inode)->loadaddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | case 0xfc0: /* LinkFS */ |
| 105 | return S_IFLNK|S_IRWXUGO; |
| 106 | |
| 107 | case 0xfe6: /* UnixExec */ |
| 108 | rmask = S_IRUGO | S_IXUGO; |
| 109 | break; |
| 110 | |
| 111 | default: |
| 112 | rmask = S_IRUGO; |
| 113 | } |
| 114 | |
| 115 | mode = S_IFREG; |
| 116 | |
| 117 | if (attr & ADFS_NDA_OWNER_READ) |
| 118 | mode |= rmask & asb->s_owner_mask; |
| 119 | |
| 120 | if (attr & ADFS_NDA_OWNER_WRITE) |
| 121 | mode |= S_IWUGO & asb->s_owner_mask; |
| 122 | |
| 123 | if (attr & ADFS_NDA_PUBLIC_READ) |
| 124 | mode |= rmask & asb->s_other_mask; |
| 125 | |
| 126 | if (attr & ADFS_NDA_PUBLIC_WRITE) |
| 127 | mode |= S_IWUGO & asb->s_other_mask; |
| 128 | return mode; |
| 129 | } |
| 130 | |
| 131 | /* |
| 132 | * Convert Linux permission to ADFS attribute. We try to do the reverse |
| 133 | * of atts2mode, but there is not a 1:1 translation. |
| 134 | */ |
Russell King | 8191624 | 2019-12-09 11:08:23 +0000 | [diff] [blame] | 135 | static int adfs_mode2atts(struct super_block *sb, struct inode *inode, |
| 136 | umode_t ia_mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
Russell King | 8191624 | 2019-12-09 11:08:23 +0000 | [diff] [blame] | 138 | struct adfs_sb_info *asb = ADFS_SB(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | umode_t mode; |
| 140 | int attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
| 142 | /* FIXME: should we be able to alter a link? */ |
| 143 | if (S_ISLNK(inode->i_mode)) |
| 144 | return ADFS_I(inode)->attr; |
| 145 | |
Russell King | 8191624 | 2019-12-09 11:08:23 +0000 | [diff] [blame] | 146 | /* Directories do not have read/write permissions on the media */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | if (S_ISDIR(inode->i_mode)) |
Russell King | 8191624 | 2019-12-09 11:08:23 +0000 | [diff] [blame] | 148 | return ADFS_NDA_DIRECTORY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
Russell King | 8191624 | 2019-12-09 11:08:23 +0000 | [diff] [blame] | 150 | attr = 0; |
| 151 | mode = ia_mode & asb->s_owner_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | if (mode & S_IRUGO) |
| 153 | attr |= ADFS_NDA_OWNER_READ; |
| 154 | if (mode & S_IWUGO) |
| 155 | attr |= ADFS_NDA_OWNER_WRITE; |
| 156 | |
Russell King | 8191624 | 2019-12-09 11:08:23 +0000 | [diff] [blame] | 157 | mode = ia_mode & asb->s_other_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | mode &= ~asb->s_owner_mask; |
| 159 | if (mode & S_IRUGO) |
| 160 | attr |= ADFS_NDA_PUBLIC_READ; |
| 161 | if (mode & S_IWUGO) |
| 162 | attr |= ADFS_NDA_PUBLIC_WRITE; |
| 163 | |
| 164 | return attr; |
| 165 | } |
| 166 | |
Russell King | eeeb9dd | 2019-12-09 11:08:18 +0000 | [diff] [blame] | 167 | static const s64 nsec_unix_epoch_diff_risc_os_epoch = 2208988800000000000LL; |
| 168 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | /* |
| 170 | * Convert an ADFS time to Unix time. ADFS has a 40-bit centi-second time |
Stuart Swales | 7a9730a | 2011-03-22 16:35:05 -0700 | [diff] [blame] | 171 | * referenced to 1 Jan 1900 (til 2248) so we need to discard 2208988800 seconds |
| 172 | * of time to convert from RISC OS epoch to Unix epoch. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | */ |
| 174 | static void |
Arnd Bergmann | d9edcbc4 | 2018-08-21 22:01:09 -0700 | [diff] [blame] | 175 | adfs_adfs2unix_time(struct timespec64 *tv, struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | { |
| 177 | unsigned int high, low; |
Stuart Swales | 7a9730a | 2011-03-22 16:35:05 -0700 | [diff] [blame] | 178 | /* 01 Jan 1970 00:00:00 (Unix epoch) as nanoseconds since |
| 179 | * 01 Jan 1900 00:00:00 (RISC OS epoch) |
| 180 | */ |
Stuart Swales | 7a9730a | 2011-03-22 16:35:05 -0700 | [diff] [blame] | 181 | s64 nsec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
Russell King | b4ed8f7 | 2019-06-04 14:50:24 +0100 | [diff] [blame] | 183 | if (!adfs_inode_is_stamped(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | goto cur_time; |
| 185 | |
Stuart Swales | 7a9730a | 2011-03-22 16:35:05 -0700 | [diff] [blame] | 186 | high = ADFS_I(inode)->loadaddr & 0xFF; /* top 8 bits of timestamp */ |
| 187 | low = ADFS_I(inode)->execaddr; /* bottom 32 bits of timestamp */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
Stuart Swales | 7a9730a | 2011-03-22 16:35:05 -0700 | [diff] [blame] | 189 | /* convert 40-bit centi-seconds to 32-bit seconds |
| 190 | * going via nanoseconds to retain precision |
| 191 | */ |
| 192 | nsec = (((s64) high << 32) | (s64) low) * 10000000; /* cs to ns */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
| 194 | /* Files dated pre 01 Jan 1970 00:00:00. */ |
Stuart Swales | 7a9730a | 2011-03-22 16:35:05 -0700 | [diff] [blame] | 195 | if (nsec < nsec_unix_epoch_diff_risc_os_epoch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | goto too_early; |
| 197 | |
Stuart Swales | 7a9730a | 2011-03-22 16:35:05 -0700 | [diff] [blame] | 198 | /* convert from RISC OS to Unix epoch */ |
| 199 | nsec -= nsec_unix_epoch_diff_risc_os_epoch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
Arnd Bergmann | d9edcbc4 | 2018-08-21 22:01:09 -0700 | [diff] [blame] | 201 | *tv = ns_to_timespec64(nsec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | return; |
| 203 | |
| 204 | cur_time: |
Arnd Bergmann | d9edcbc4 | 2018-08-21 22:01:09 -0700 | [diff] [blame] | 205 | *tv = current_time(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | return; |
| 207 | |
| 208 | too_early: |
| 209 | tv->tv_sec = tv->tv_nsec = 0; |
| 210 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } |
| 212 | |
Russell King | eeeb9dd | 2019-12-09 11:08:18 +0000 | [diff] [blame] | 213 | /* Convert an Unix time to ADFS time for an entry that is already stamped. */ |
| 214 | static void adfs_unix2adfs_time(struct inode *inode, |
| 215 | const struct timespec64 *ts) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | { |
Russell King | eeeb9dd | 2019-12-09 11:08:18 +0000 | [diff] [blame] | 217 | s64 cs, nsec = timespec64_to_ns(ts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | |
Russell King | eeeb9dd | 2019-12-09 11:08:18 +0000 | [diff] [blame] | 219 | /* convert from Unix to RISC OS epoch */ |
| 220 | nsec += nsec_unix_epoch_diff_risc_os_epoch; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
Russell King | eeeb9dd | 2019-12-09 11:08:18 +0000 | [diff] [blame] | 222 | /* convert from nanoseconds to centiseconds */ |
| 223 | cs = div_s64(nsec, 10000000); |
| 224 | |
| 225 | cs = clamp_t(s64, cs, 0, 0xffffffffff); |
| 226 | |
| 227 | ADFS_I(inode)->loadaddr &= ~0xff; |
| 228 | ADFS_I(inode)->loadaddr |= (cs >> 32) & 0xff; |
| 229 | ADFS_I(inode)->execaddr = cs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | } |
| 231 | |
| 232 | /* |
| 233 | * Fill in the inode information from the object information. |
| 234 | * |
| 235 | * Note that this is an inode-less filesystem, so we can't use the inode |
| 236 | * number to reference the metadata on the media. Instead, we use the |
| 237 | * inode number to hold the object ID, which in turn will tell us where |
| 238 | * the data is held. We also save the parent object ID, and with these |
| 239 | * two, we can locate the metadata. |
| 240 | * |
| 241 | * This does mean that we rely on an objects parent remaining the same at |
| 242 | * all times - we cannot cope with a cross-directory rename (yet). |
| 243 | */ |
| 244 | struct inode * |
| 245 | adfs_iget(struct super_block *sb, struct object_info *obj) |
| 246 | { |
| 247 | struct inode *inode; |
Jeff Layton | ca9649e | 2023-10-04 14:52:01 -0400 | [diff] [blame] | 248 | struct timespec64 ts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
| 250 | inode = new_inode(sb); |
| 251 | if (!inode) |
| 252 | goto out; |
| 253 | |
| 254 | inode->i_uid = ADFS_SB(sb)->s_uid; |
| 255 | inode->i_gid = ADFS_SB(sb)->s_gid; |
Russell King | 5ed70bb | 2019-06-04 14:49:57 +0100 | [diff] [blame] | 256 | inode->i_ino = obj->indaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | inode->i_size = obj->size; |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 258 | set_nlink(inode, 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | inode->i_blocks = (inode->i_size + sb->s_blocksize - 1) >> |
| 260 | sb->s_blocksize_bits; |
| 261 | |
| 262 | /* |
| 263 | * we need to save the parent directory ID so that |
| 264 | * write_inode can update the directory information |
| 265 | * for this file. This will need special handling |
| 266 | * for cross-directory renames. |
| 267 | */ |
| 268 | ADFS_I(inode)->parent_id = obj->parent_id; |
Russell King | 25e5d4d | 2019-12-09 11:11:38 +0000 | [diff] [blame] | 269 | ADFS_I(inode)->indaddr = obj->indaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | ADFS_I(inode)->loadaddr = obj->loadaddr; |
| 271 | ADFS_I(inode)->execaddr = obj->execaddr; |
| 272 | ADFS_I(inode)->attr = obj->attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | |
| 274 | inode->i_mode = adfs_atts2mode(sb, inode); |
Jeff Layton | ca9649e | 2023-10-04 14:52:01 -0400 | [diff] [blame] | 275 | adfs_adfs2unix_time(&ts, inode); |
| 276 | inode_set_atime_to_ts(inode, ts); |
| 277 | inode_set_mtime_to_ts(inode, ts); |
| 278 | inode_set_ctime_to_ts(inode, ts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
| 280 | if (S_ISDIR(inode->i_mode)) { |
| 281 | inode->i_op = &adfs_dir_inode_operations; |
| 282 | inode->i_fop = &adfs_dir_operations; |
| 283 | } else if (S_ISREG(inode->i_mode)) { |
| 284 | inode->i_op = &adfs_file_inode_operations; |
| 285 | inode->i_fop = &adfs_file_operations; |
| 286 | inode->i_mapping->a_ops = &adfs_aops; |
| 287 | ADFS_I(inode)->mmu_private = inode->i_size; |
| 288 | } |
| 289 | |
Al Viro | d8e78da | 2018-06-30 03:15:49 -0400 | [diff] [blame] | 290 | inode_fake_hash(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
| 292 | out: |
| 293 | return inode; |
| 294 | } |
| 295 | |
| 296 | /* |
| 297 | * Validate and convert a changed access mode/time to their ADFS equivalents. |
| 298 | * adfs_write_inode will actually write the information back to the directory |
| 299 | * later. |
| 300 | */ |
| 301 | int |
Christian Brauner | c1632a0 | 2023-01-13 12:49:11 +0100 | [diff] [blame] | 302 | adfs_notify_change(struct mnt_idmap *idmap, struct dentry *dentry, |
Christian Brauner | 549c729 | 2021-01-21 14:19:43 +0100 | [diff] [blame] | 303 | struct iattr *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 305 | struct inode *inode = d_inode(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | struct super_block *sb = inode->i_sb; |
| 307 | unsigned int ia_valid = attr->ia_valid; |
| 308 | int error; |
| 309 | |
Christian Brauner | c1632a0 | 2023-01-13 12:49:11 +0100 | [diff] [blame] | 310 | error = setattr_prepare(&nop_mnt_idmap, dentry, attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | |
| 312 | /* |
| 313 | * we can't change the UID or GID of any file - |
| 314 | * we have a global UID/GID in the superblock |
| 315 | */ |
Eric W. Biederman | c010d1f | 2012-02-07 15:58:38 -0800 | [diff] [blame] | 316 | if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, ADFS_SB(sb)->s_uid)) || |
| 317 | (ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, ADFS_SB(sb)->s_gid))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | error = -EPERM; |
| 319 | |
| 320 | if (error) |
| 321 | goto out; |
| 322 | |
npiggin@suse.de | 15c6fd9 | 2010-05-27 01:05:34 +1000 | [diff] [blame] | 323 | /* XXX: this is missing some actual on-disk truncation.. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | if (ia_valid & ATTR_SIZE) |
Christoph Hellwig | 2c27c65 | 2010-06-04 11:30:04 +0200 | [diff] [blame] | 325 | truncate_setsize(inode, attr->ia_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
Russell King | eeeb9dd | 2019-12-09 11:08:18 +0000 | [diff] [blame] | 327 | if (ia_valid & ATTR_MTIME && adfs_inode_is_stamped(inode)) { |
| 328 | adfs_unix2adfs_time(inode, &attr->ia_mtime); |
Jeff Layton | ca9649e | 2023-10-04 14:52:01 -0400 | [diff] [blame] | 329 | adfs_adfs2unix_time(&attr->ia_mtime, inode); |
| 330 | inode_set_mtime_to_ts(inode, attr->ia_mtime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | } |
Russell King | eeeb9dd | 2019-12-09 11:08:18 +0000 | [diff] [blame] | 332 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | /* |
| 334 | * FIXME: should we make these == to i_mtime since we don't |
| 335 | * have the ability to represent them in our filesystem? |
| 336 | */ |
| 337 | if (ia_valid & ATTR_ATIME) |
Jeff Layton | ca9649e | 2023-10-04 14:52:01 -0400 | [diff] [blame] | 338 | inode_set_atime_to_ts(inode, attr->ia_atime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | if (ia_valid & ATTR_CTIME) |
Jeff Layton | 9689414 | 2023-07-05 15:00:47 -0400 | [diff] [blame] | 340 | inode_set_ctime_to_ts(inode, attr->ia_ctime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | if (ia_valid & ATTR_MODE) { |
Russell King | 8191624 | 2019-12-09 11:08:23 +0000 | [diff] [blame] | 342 | ADFS_I(inode)->attr = adfs_mode2atts(sb, inode, attr->ia_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | inode->i_mode = adfs_atts2mode(sb, inode); |
| 344 | } |
| 345 | |
| 346 | /* |
| 347 | * FIXME: should we be marking this inode dirty even if |
| 348 | * we don't have any metadata to write back? |
| 349 | */ |
| 350 | if (ia_valid & (ATTR_SIZE | ATTR_MTIME | ATTR_MODE)) |
| 351 | mark_inode_dirty(inode); |
| 352 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | return error; |
| 354 | } |
| 355 | |
| 356 | /* |
| 357 | * write an existing inode back to the directory, and therefore the disk. |
| 358 | * The adfs-specific inode data has already been updated by |
| 359 | * adfs_notify_change() |
| 360 | */ |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 361 | int adfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | { |
| 363 | struct super_block *sb = inode->i_sb; |
| 364 | struct object_info obj; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
Russell King | 25e5d4d | 2019-12-09 11:11:38 +0000 | [diff] [blame] | 366 | obj.indaddr = ADFS_I(inode)->indaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | obj.name_len = 0; |
| 368 | obj.parent_id = ADFS_I(inode)->parent_id; |
| 369 | obj.loadaddr = ADFS_I(inode)->loadaddr; |
| 370 | obj.execaddr = ADFS_I(inode)->execaddr; |
| 371 | obj.attr = ADFS_I(inode)->attr; |
| 372 | obj.size = inode->i_size; |
| 373 | |
Minghao Chi | 25d2e88 | 2022-01-19 18:09:53 -0800 | [diff] [blame] | 374 | return adfs_dir_update(sb, &obj, wbc->sync_mode == WB_SYNC_ALL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | } |