/* * linux/fs/affs/inode.c * * (c) 1996 Hans-Joachim Widmaier - Rewritten * * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. * * (C) 1992 Eric Youngdale Modified for ISO9660 filesystem. * * (C) 1991 Linus Torvalds - minix filesystem */ #include <linux/sched.h> #include "affs.h" extern const struct inode_operations affs_symlink_inode_operations; extern struct timezone sys_tz; struct inode *affs_iget(struct super_block *sb, unsigned long ino) { struct affs_sb_info *sbi = AFFS_SB(sb); struct buffer_head *bh; struct affs_head *head; struct affs_tail *tail; struct inode *inode; u32 block; u32 size; u32 prot; u16 id; inode = iget_locked(sb, ino); if (!inode) return ERR_PTR(-ENOMEM); if (!(inode->i_state & I_NEW)) return inode; pr_debug("AFFS: affs_iget(%lu)\n", inode->i_ino); block = inode->i_ino; bh = affs_bread(sb, block); if (!bh) { affs_warning(sb, "read_inode", "Cannot read block %d", block); goto bad_inode; } if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) { affs_warning(sb,"read_inode", "Checksum or type (ptype=%d) error on inode %d", AFFS_HEAD(bh)->ptype, block); goto bad_inode; } head = AFFS_HEAD(bh); tail = AFFS_TAIL(sb, bh); prot = be32_to_cpu(tail->protect); inode->i_size = 0; inode->i_nlink = 1; inode->i_mode = 0; AFFS_I(inode)->i_extcnt = 1; AFFS_I(inode)->i_ext_last = ~1; AFFS_I(inode)->i_protect = prot; atomic_set(&AFFS_I(inode)->i_opencnt, 0); AFFS_I(inode)->i_blkcnt = 0; AFFS_I(inode)->i_lc = NULL; AFFS_I(inode)->i_lc_size = 0; AFFS_I(inode)->i_lc_shift = 0; AFFS_I(inode)->i_lc_mask = 0; AFFS_I(inode)->i_ac = NULL; AFFS_I(inode)->i_ext_bh = NULL; AFFS_I(inode)->mmu_private = 0; AFFS_I(inode)->i_lastalloc = 0; AFFS_I(inode)->i_pa_cnt = 0; if (sbi->s_flags & SF_SETMODE) inode->i_mode = sbi->s_mode; else inode->i_mode = prot_to_mode(prot); id = be16_to_cpu(tail->uid); if (id == 0 || sbi->s_flags & SF_SETUID) inode->i_uid = sbi->s_uid; else if (id == 0xFFFF && sbi->s_flags & SF_MUFS) inode->i_uid = 0; else inode->i_uid = id; id = be16_to_cpu(tail->gid); if (id == 0 || sbi->s_flags & SF_SETGID) inode->i_gid = sbi->s_gid; else if (id == 0xFFFF && sbi->s_flags & SF_MUFS) inode->i_gid = 0; else inode->i_gid = id; switch (be32_to_cpu(tail->stype)) { case ST_ROOT: inode->i_uid = sbi->s_uid; inode->i_gid = sbi->s_gid; /* fall through */ case ST_USERDIR: if (be32_to_cpu(tail->stype) == ST_USERDIR || sbi->s_flags & SF_SETMODE) { if (inode->i_mode & S_IRUSR) inode->i_mode |= S_IXUSR; if (inode->i_mode & S_IRGRP) inode->i_mode |= S_IXGRP; if (inode->i_mode & S_IROTH) inode->i_mode |= S_IXOTH; inode->i_mode |= S_IFDIR; } else inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR; /* Maybe it should be controlled by mount parameter? */ //inode->i_mode |= S_ISVTX; inode->i_op = &affs_dir_inode_operations; inode->i_fop = &affs_dir_operations; break; case ST_LINKDIR: #if 0 affs_warning(sb, "read_inode", "inode is LINKDIR"); goto bad_inode; #else inode->i_mode |= S_IFDIR; /* ... and leave ->i_op and ->i_fop pointing to empty */ break; #endif case ST_LINKFILE: affs_warning(sb, "read_inode", "inode is LINKFILE"); goto bad_inode; case ST_FILE: size = be32_to_cpu(tail->size); inode->i_mode |= S_IFREG; AFFS_I(inode)->mmu_private = inode->i_size = size; if (inode->i_size) { AFFS_I(inode)->i_blkcnt = (size - 1) / sbi->s_data_blksize + 1; AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) / sbi->s_hashsize + 1; } if (tail->link_chain) inode->i_nlink = 2; inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops; inode->i_op = &affs_file_inode_operations; inode->i_fop = &affs_file_operations; break; case ST_SOFTLINK: inode->i_mode |= S_IFLNK; inode->i_op = &affs_symlink_inode_operations; inode->i_data.a_ops = &affs_symlink_aops; break; } inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) + be32_to_cpu(tail->change.mins) * 60 + be32_to_cpu(tail->change.ticks) / 50 + ((8 * 365 + 2) * 24 * 60 * 60)) + sys_tz.tz_minuteswest * 60; inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0; affs_brelse(bh); unlock_new_inode(inode); return inode; bad_inode: affs_brelse(bh); iget_failed(inode); return ERR_PTR(-EIO); } int affs_write_inode(struct inode *inode, int unused) { struct super_block *sb = inode->i_sb; struct buffer_head *bh; struct affs_tail *tail; uid_t uid; gid_t gid; pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino); if (!inode->i_nlink) // possibly free block return 0; bh = affs_bread(sb, inode->i_ino); if (!bh) { affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino); return -EIO; } tail = AFFS_TAIL(sb, bh); if (tail->stype == cpu_to_be32(ST_ROOT)) { secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change); } else { tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect); tail->size = cpu_to_be32(inode->i_size); secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change); if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) { uid = inode->i_uid; gid = inode->i_gid; if (AFFS_SB(sb)->s_flags & SF_MUFS) { if (inode->i_uid == 0 || inode->i_uid == 0xFFFF) uid = inode->i_uid ^ ~0; if (inode->i_gid == 0 || inode->i_gid == 0xFFFF) gid = inode->i_gid ^ ~0; } if (!(AFFS_SB(sb)->s_flags & SF_SETUID)) tail->uid = cpu_to_be16(uid); if (!(AFFS_SB(sb)->s_flags & SF_SETGID)) tail->gid = cpu_to_be16(gid); } } affs_fix_checksum(sb, bh); mark_buffer_dirty_inode(bh, inode); affs_brelse(bh); affs_free_prealloc(inode); return 0; } int affs_notify_change(struct dentry *dentry, struct iattr *attr) { struct inode *inode = dentry->d_inode; int error; pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid); error = inode_change_ok(inode,attr); if (error) goto out; if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) || ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) || ((attr->ia_valid & ATTR_MODE) && (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) { if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET)) error = -EPERM; goto out; } error = inode_setattr(inode, attr); if (!error && (attr->ia_valid & ATTR_MODE)) mode_to_prot(inode); out: return error; } void affs_delete_inode(struct inode *inode) { pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink); truncate_inode_pages(&inode->i_data, 0); inode->i_size = 0; affs_truncate(inode); clear_inode(inode); affs_free_block(inode->i_sb, inode->i_ino); } void affs_clear_inode(struct inode *inode) { unsigned long cache_page; pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink); affs_free_prealloc(inode); cache_page = (unsigned long)AFFS_I(inode)->i_lc; if (cache_page) { pr_debug("AFFS: freeing ext cache\n"); AFFS_I(inode)->i_lc = NULL; AFFS_I(inode)->i_ac = NULL; free_page(cache_page); } affs_brelse(AFFS_I(inode)->i_ext_bh); AFFS_I(inode)->i_ext_last = ~1; AFFS_I(inode)->i_ext_bh = NULL; } struct inode * affs_new_inode(struct inode *dir) { struct super_block *sb = dir->i_sb; struct inode *inode; u32 block; struct buffer_head *bh; if (!(inode = new_inode(sb))) goto err_inode; if (!(block = affs_alloc_block(dir, dir->i_ino))) goto err_block; bh = affs_getzeroblk(sb, block); if (!bh) goto err_bh; mark_buffer_dirty_inode(bh, inode); affs_brelse(bh); inode->i_uid = current_fsuid(); inode->i_gid = current_fsgid(); inode->i_ino = block; inode->i_nlink = 1; inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; atomic_set(&AFFS_I(inode)->i_opencnt, 0); AFFS_I(inode)->i_blkcnt = 0; AFFS_I(inode)->i_lc = NULL; AFFS_I(inode)->i_lc_size = 0; AFFS_I(inode)->i_lc_shift = 0; AFFS_I(inode)->i_lc_mask = 0; AFFS_I(inode)->i_ac = NULL; AFFS_I(inode)->i_ext_bh = NULL; AFFS_I(inode)->mmu_private = 0; AFFS_I(inode)->i_protect = 0; AFFS_I(inode)->i_lastalloc = 0; AFFS_I(inode)->i_pa_cnt = 0; AFFS_I(inode)->i_extcnt = 1; AFFS_I(inode)->i_ext_last = ~1; insert_inode_hash(inode); return inode; err_bh: affs_free_block(sb, block); err_block: iput(inode); err_inode: return NULL; } /* * Add an entry to a directory. Create the header block * and insert it into the hash table. */ int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type) { struct super_block *sb = dir->i_sb; struct buffer_head *inode_bh = NULL; struct buffer_head *bh = NULL; u32 block = 0; int retval; pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino, (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type); retval = -EIO; bh = affs_bread(sb, inode->i_ino); if (!bh) goto done; affs_lock_link(inode); switch (type) { case ST_LINKFILE: case ST_LINKDIR: retval = -ENOSPC; block = affs_alloc_block(dir, dir->i_ino); if (!block) goto err; retval = -EIO; inode_bh = bh; bh = affs_getzeroblk(sb, block); if (!bh) goto err; break; default: break; } AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT); AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr); affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry); AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type); AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); if (inode_bh) { __be32 chain; chain = AFFS_TAIL(sb, inode_bh)->link_chain; AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino); AFFS_TAIL(sb, bh)->link_chain = chain; AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block); affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain)); mark_buffer_dirty_inode(inode_bh, inode); inode->i_nlink = 2; atomic_inc(&inode->i_count); } affs_fix_checksum(sb, bh); mark_buffer_dirty_inode(bh, inode); dentry->d_fsdata = (void *)(long)bh->b_blocknr; affs_lock_dir(dir); retval = affs_insert_hash(dir, bh); mark_buffer_dirty_inode(bh, inode); affs_unlock_dir(dir); affs_unlock_link(inode); d_instantiate(dentry, inode); done: affs_brelse(inode_bh); affs_brelse(bh); return retval; err: if (block) affs_free_block(sb, block); affs_unlock_link(inode); goto done; }