From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- fs/affs/inode.c | 416 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 416 insertions(+) create mode 100644 fs/affs/inode.c (limited to 'fs/affs/inode.c') diff --git a/fs/affs/inode.c b/fs/affs/inode.c new file mode 100644 index 000000000..a022f4acc --- /dev/null +++ b/fs/affs/inode.c @@ -0,0 +1,416 @@ +/* + * 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 +#include +#include "affs.h" + +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_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_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; + } + + tail = AFFS_TAIL(sb, bh); + prot = be32_to_cpu(tail->protect); + + inode->i_size = 0; + set_nlink(inode, 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 (affs_test_opt(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 || affs_test_opt(sbi->s_flags, SF_SETUID)) + inode->i_uid = sbi->s_uid; + else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS)) + i_uid_write(inode, 0); + else + i_uid_write(inode, id); + + id = be16_to_cpu(tail->gid); + if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETGID)) + inode->i_gid = sbi->s_gid; + else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS)) + i_gid_write(inode, 0); + else + i_gid_write(inode, 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 || + affs_test_opt(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) + set_nlink(inode, 2); + inode->i_mapping->a_ops = affs_test_opt(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, struct writeback_control *wbc) +{ + struct super_block *sb = inode->i_sb; + struct buffer_head *bh; + struct affs_tail *tail; + uid_t uid; + gid_t gid; + + pr_debug("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 = i_uid_read(inode); + gid = i_gid_read(inode); + if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) { + if (uid == 0 || uid == 0xFFFF) + uid = uid ^ ~0; + if (gid == 0 || gid == 0xFFFF) + gid = gid ^ ~0; + } + if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID)) + tail->uid = cpu_to_be16(uid); + if (!affs_test_opt(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 = d_inode(dentry); + int error; + + pr_debug("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_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) || + ((attr->ia_valid & ATTR_GID) && + affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) || + ((attr->ia_valid & ATTR_MODE) && + (AFFS_SB(inode->i_sb)->s_flags & + (AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) { + if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET)) + error = -EPERM; + goto out; + } + + if ((attr->ia_valid & ATTR_SIZE) && + attr->ia_size != i_size_read(inode)) { + error = inode_newsize_ok(inode, attr->ia_size); + if (error) + return error; + + truncate_setsize(inode, attr->ia_size); + affs_truncate(inode); + } + + setattr_copy(inode, attr); + mark_inode_dirty(inode); + + if (attr->ia_valid & ATTR_MODE) + mode_to_prot(inode); +out: + return error; +} + +void +affs_evict_inode(struct inode *inode) +{ + unsigned long cache_page; + pr_debug("evict_inode(ino=%lu, nlink=%u)\n", + inode->i_ino, inode->i_nlink); + truncate_inode_pages_final(&inode->i_data); + + if (!inode->i_nlink) { + inode->i_size = 0; + affs_truncate(inode); + } + + invalidate_inode_buffers(inode); + clear_inode(inode); + affs_free_prealloc(inode); + cache_page = (unsigned long)AFFS_I(inode)->i_lc; + if (cache_page) { + pr_debug("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; + + if (!inode->i_nlink) + affs_free_block(inode->i_sb, inode->i_ino); +} + +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; + set_nlink(inode, 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("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__, + dir->i_ino, inode->i_ino, dentry, 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); + set_nlink(inode, 2); + ihold(inode); + } + 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; +} -- cgit v1.2.3-54-g00ecf