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1// SPDX-License-Identifier: GPL-2.02/*3 * linux/fs/affs/inode.c4 *5 * (c) 1996 Hans-Joachim Widmaier - Rewritten6 *7 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.8 *9 * (C) 1992 Eric Youngdale Modified for ISO9660 filesystem.10 *11 * (C) 1991 Linus Torvalds - minix filesystem12 */13#include <linux/sched.h>14#include <linux/cred.h>15#include <linux/gfp.h>16#include "affs.h"17 18struct inode *affs_iget(struct super_block *sb, unsigned long ino)19{20 struct affs_sb_info *sbi = AFFS_SB(sb);21 struct buffer_head *bh;22 struct affs_tail *tail;23 struct inode *inode;24 u32 block;25 u32 size;26 u32 prot;27 u16 id;28 29 inode = iget_locked(sb, ino);30 if (!inode)31 return ERR_PTR(-ENOMEM);32 if (!(inode->i_state & I_NEW))33 return inode;34 35 pr_debug("affs_iget(%lu)\n", inode->i_ino);36 37 block = inode->i_ino;38 bh = affs_bread(sb, block);39 if (!bh) {40 affs_warning(sb, "read_inode", "Cannot read block %d", block);41 goto bad_inode;42 }43 if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {44 affs_warning(sb,"read_inode",45 "Checksum or type (ptype=%d) error on inode %d",46 AFFS_HEAD(bh)->ptype, block);47 goto bad_inode;48 }49 50 tail = AFFS_TAIL(sb, bh);51 prot = be32_to_cpu(tail->protect);52 53 inode->i_size = 0;54 set_nlink(inode, 1);55 inode->i_mode = 0;56 AFFS_I(inode)->i_extcnt = 1;57 AFFS_I(inode)->i_ext_last = ~1;58 AFFS_I(inode)->i_protect = prot;59 atomic_set(&AFFS_I(inode)->i_opencnt, 0);60 AFFS_I(inode)->i_blkcnt = 0;61 AFFS_I(inode)->i_lc = NULL;62 AFFS_I(inode)->i_lc_size = 0;63 AFFS_I(inode)->i_lc_shift = 0;64 AFFS_I(inode)->i_lc_mask = 0;65 AFFS_I(inode)->i_ac = NULL;66 AFFS_I(inode)->i_ext_bh = NULL;67 AFFS_I(inode)->mmu_private = 0;68 AFFS_I(inode)->i_lastalloc = 0;69 AFFS_I(inode)->i_pa_cnt = 0;70 71 if (affs_test_opt(sbi->s_flags, SF_SETMODE))72 inode->i_mode = sbi->s_mode;73 else74 inode->i_mode = affs_prot_to_mode(prot);75 76 id = be16_to_cpu(tail->uid);77 if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETUID))78 inode->i_uid = sbi->s_uid;79 else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))80 i_uid_write(inode, 0);81 else82 i_uid_write(inode, id);83 84 id = be16_to_cpu(tail->gid);85 if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETGID))86 inode->i_gid = sbi->s_gid;87 else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))88 i_gid_write(inode, 0);89 else90 i_gid_write(inode, id);91 92 switch (be32_to_cpu(tail->stype)) {93 case ST_ROOT:94 inode->i_uid = sbi->s_uid;95 inode->i_gid = sbi->s_gid;96 fallthrough;97 case ST_USERDIR:98 if (be32_to_cpu(tail->stype) == ST_USERDIR ||99 affs_test_opt(sbi->s_flags, SF_SETMODE)) {100 if (inode->i_mode & S_IRUSR)101 inode->i_mode |= S_IXUSR;102 if (inode->i_mode & S_IRGRP)103 inode->i_mode |= S_IXGRP;104 if (inode->i_mode & S_IROTH)105 inode->i_mode |= S_IXOTH;106 inode->i_mode |= S_IFDIR;107 } else108 inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;109 /* Maybe it should be controlled by mount parameter? */110 //inode->i_mode |= S_ISVTX;111 inode->i_op = &affs_dir_inode_operations;112 inode->i_fop = &affs_dir_operations;113 break;114 case ST_LINKDIR:115#if 0116 affs_warning(sb, "read_inode", "inode is LINKDIR");117 goto bad_inode;118#else119 inode->i_mode |= S_IFDIR;120 /* ... and leave ->i_op and ->i_fop pointing to empty */121 break;122#endif123 case ST_LINKFILE:124 affs_warning(sb, "read_inode", "inode is LINKFILE");125 goto bad_inode;126 case ST_FILE:127 size = be32_to_cpu(tail->size);128 inode->i_mode |= S_IFREG;129 AFFS_I(inode)->mmu_private = inode->i_size = size;130 if (inode->i_size) {131 AFFS_I(inode)->i_blkcnt = (size - 1) /132 sbi->s_data_blksize + 1;133 AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /134 sbi->s_hashsize + 1;135 }136 if (tail->link_chain)137 set_nlink(inode, 2);138 inode->i_mapping->a_ops = affs_test_opt(sbi->s_flags, SF_OFS) ?139 &affs_aops_ofs : &affs_aops;140 inode->i_op = &affs_file_inode_operations;141 inode->i_fop = &affs_file_operations;142 break;143 case ST_SOFTLINK:144 inode->i_size = strlen((char *)AFFS_HEAD(bh)->table);145 inode->i_mode |= S_IFLNK;146 inode_nohighmem(inode);147 inode->i_op = &affs_symlink_inode_operations;148 inode->i_data.a_ops = &affs_symlink_aops;149 break;150 }151 152 inode_set_mtime(inode,153 inode_set_atime(inode, inode_set_ctime(inode, (be32_to_cpu(tail->change.days) * 86400LL + be32_to_cpu(tail->change.mins) * 60 + be32_to_cpu(tail->change.ticks) / 50 + AFFS_EPOCH_DELTA) + sys_tz.tz_minuteswest * 60, 0).tv_sec, 0).tv_sec,154 0);155 affs_brelse(bh);156 unlock_new_inode(inode);157 return inode;158 159bad_inode:160 affs_brelse(bh);161 iget_failed(inode);162 return ERR_PTR(-EIO);163}164 165int166affs_write_inode(struct inode *inode, struct writeback_control *wbc)167{168 struct super_block *sb = inode->i_sb;169 struct buffer_head *bh;170 struct affs_tail *tail;171 uid_t uid;172 gid_t gid;173 174 pr_debug("write_inode(%lu)\n", inode->i_ino);175 176 if (!inode->i_nlink)177 // possibly free block178 return 0;179 bh = affs_bread(sb, inode->i_ino);180 if (!bh) {181 affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);182 return -EIO;183 }184 tail = AFFS_TAIL(sb, bh);185 if (tail->stype == cpu_to_be32(ST_ROOT)) {186 affs_secs_to_datestamp(inode_get_mtime_sec(inode),187 &AFFS_ROOT_TAIL(sb, bh)->root_change);188 } else {189 tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);190 tail->size = cpu_to_be32(inode->i_size);191 affs_secs_to_datestamp(inode_get_mtime_sec(inode),192 &tail->change);193 if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {194 uid = i_uid_read(inode);195 gid = i_gid_read(inode);196 if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) {197 if (uid == 0 || uid == 0xFFFF)198 uid = uid ^ ~0;199 if (gid == 0 || gid == 0xFFFF)200 gid = gid ^ ~0;201 }202 if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID))203 tail->uid = cpu_to_be16(uid);204 if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETGID))205 tail->gid = cpu_to_be16(gid);206 }207 }208 affs_fix_checksum(sb, bh);209 mark_buffer_dirty_inode(bh, inode);210 affs_brelse(bh);211 affs_free_prealloc(inode);212 return 0;213}214 215int216affs_notify_change(struct mnt_idmap *idmap, struct dentry *dentry,217 struct iattr *attr)218{219 struct inode *inode = d_inode(dentry);220 int error;221 222 pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid);223 224 error = setattr_prepare(&nop_mnt_idmap, dentry, attr);225 if (error)226 goto out;227 228 if (((attr->ia_valid & ATTR_UID) &&229 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) ||230 ((attr->ia_valid & ATTR_GID) &&231 affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) ||232 ((attr->ia_valid & ATTR_MODE) &&233 (AFFS_SB(inode->i_sb)->s_flags &234 (AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) {235 if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET))236 error = -EPERM;237 goto out;238 }239 240 if ((attr->ia_valid & ATTR_SIZE) &&241 attr->ia_size != i_size_read(inode)) {242 error = inode_newsize_ok(inode, attr->ia_size);243 if (error)244 return error;245 246 truncate_setsize(inode, attr->ia_size);247 affs_truncate(inode);248 }249 250 setattr_copy(&nop_mnt_idmap, inode, attr);251 mark_inode_dirty(inode);252 253 if (attr->ia_valid & ATTR_MODE)254 affs_mode_to_prot(inode);255out:256 return error;257}258 259void260affs_evict_inode(struct inode *inode)261{262 unsigned long cache_page;263 pr_debug("evict_inode(ino=%lu, nlink=%u)\n",264 inode->i_ino, inode->i_nlink);265 truncate_inode_pages_final(&inode->i_data);266 267 if (!inode->i_nlink) {268 inode->i_size = 0;269 affs_truncate(inode);270 }271 272 invalidate_inode_buffers(inode);273 clear_inode(inode);274 affs_free_prealloc(inode);275 cache_page = (unsigned long)AFFS_I(inode)->i_lc;276 if (cache_page) {277 pr_debug("freeing ext cache\n");278 AFFS_I(inode)->i_lc = NULL;279 AFFS_I(inode)->i_ac = NULL;280 free_page(cache_page);281 }282 affs_brelse(AFFS_I(inode)->i_ext_bh);283 AFFS_I(inode)->i_ext_last = ~1;284 AFFS_I(inode)->i_ext_bh = NULL;285 286 if (!inode->i_nlink)287 affs_free_block(inode->i_sb, inode->i_ino);288}289 290struct inode *291affs_new_inode(struct inode *dir)292{293 struct super_block *sb = dir->i_sb;294 struct inode *inode;295 u32 block;296 struct buffer_head *bh;297 298 if (!(inode = new_inode(sb)))299 goto err_inode;300 301 if (!(block = affs_alloc_block(dir, dir->i_ino)))302 goto err_block;303 304 bh = affs_getzeroblk(sb, block);305 if (!bh)306 goto err_bh;307 mark_buffer_dirty_inode(bh, inode);308 affs_brelse(bh);309 310 inode->i_uid = current_fsuid();311 inode->i_gid = current_fsgid();312 inode->i_ino = block;313 set_nlink(inode, 1);314 simple_inode_init_ts(inode);315 atomic_set(&AFFS_I(inode)->i_opencnt, 0);316 AFFS_I(inode)->i_blkcnt = 0;317 AFFS_I(inode)->i_lc = NULL;318 AFFS_I(inode)->i_lc_size = 0;319 AFFS_I(inode)->i_lc_shift = 0;320 AFFS_I(inode)->i_lc_mask = 0;321 AFFS_I(inode)->i_ac = NULL;322 AFFS_I(inode)->i_ext_bh = NULL;323 AFFS_I(inode)->mmu_private = 0;324 AFFS_I(inode)->i_protect = 0;325 AFFS_I(inode)->i_lastalloc = 0;326 AFFS_I(inode)->i_pa_cnt = 0;327 AFFS_I(inode)->i_extcnt = 1;328 AFFS_I(inode)->i_ext_last = ~1;329 330 insert_inode_hash(inode);331 332 return inode;333 334err_bh:335 affs_free_block(sb, block);336err_block:337 iput(inode);338err_inode:339 return NULL;340}341 342/*343 * Add an entry to a directory. Create the header block344 * and insert it into the hash table.345 */346 347int348affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)349{350 struct super_block *sb = dir->i_sb;351 struct buffer_head *inode_bh = NULL;352 struct buffer_head *bh;353 u32 block = 0;354 int retval;355 356 pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__,357 dir->i_ino, inode->i_ino, dentry, type);358 359 retval = -EIO;360 bh = affs_bread(sb, inode->i_ino);361 if (!bh)362 goto done;363 364 affs_lock_link(inode);365 switch (type) {366 case ST_LINKFILE:367 case ST_LINKDIR:368 retval = -ENOSPC;369 block = affs_alloc_block(dir, dir->i_ino);370 if (!block)371 goto err;372 retval = -EIO;373 inode_bh = bh;374 bh = affs_getzeroblk(sb, block);375 if (!bh)376 goto err;377 break;378 default:379 break;380 }381 382 AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);383 AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);384 affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);385 AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);386 AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);387 388 if (inode_bh) {389 __be32 chain;390 chain = AFFS_TAIL(sb, inode_bh)->link_chain;391 AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);392 AFFS_TAIL(sb, bh)->link_chain = chain;393 AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);394 affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));395 mark_buffer_dirty_inode(inode_bh, inode);396 set_nlink(inode, 2);397 ihold(inode);398 }399 affs_fix_checksum(sb, bh);400 mark_buffer_dirty_inode(bh, inode);401 dentry->d_fsdata = (void *)(long)bh->b_blocknr;402 403 affs_lock_dir(dir);404 retval = affs_insert_hash(dir, bh);405 mark_buffer_dirty_inode(bh, inode);406 affs_unlock_dir(dir);407 affs_unlock_link(inode);408 409 d_instantiate(dentry, inode);410done:411 affs_brelse(inode_bh);412 affs_brelse(bh);413 return retval;414err:415 if (block)416 affs_free_block(sb, block);417 affs_unlock_link(inode);418 goto done;419}420