[linux.git] / fs / affs / inode.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  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 <linux/cred.h>
#include <linux/gfp.h>
#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 = affs_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_size = strlen((char *)AFFS_HEAD(bh)->table);
		inode->i_mode |= S_IFLNK;
		inode_nohighmem(inode);
		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)) {
		affs_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);
		affs_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 = setattr_prepare(dentry, 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)
		affs_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(inode);
	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;
	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;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* linux/fs/affs/inode.c
	4	*
	5	* (c) 1996 Hans-Joachim Widmaier - Rewritten
	6	*
	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 filesystem
	12	*/
e8edc6e0	13	#include <linux/sched.h>
5b825c3a	14	#include <linux/cred.h>
5a0e3ad6	15	#include <linux/gfp.h>
1da177e4 LT	16	#include "affs.h"
1da177e4 LT	17
210f8559	18	struct inode affs_iget(struct super_block sb, unsigned long ino)
1da177e4	19	{
1da177e4 LT	20	struct affs_sb_info *sbi = AFFS_SB(sb);
1da177e4 LT	21	struct buffer_head *bh;
1da177e4	22	struct affs_tail *tail;
210f8559	23	struct inode *inode;
1da177e4 LT	24	u32 block;
	25	u32 size;
	26	u32 prot;
	27	u16 id;
	28
210f8559 DH	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
9606d9aa	35	pr_debug("affs_iget(%lu)\n", inode->i_ino);
1da177e4 LT	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
1da177e4 LT	50	tail = AFFS_TAIL(sb, bh);
	51	prot = be32_to_cpu(tail->protect);
	52
	53	inode->i_size = 0;
bfe86848	54	set_nlink(inode, 1);
1da177e4 LT	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;
dca3c336	59	atomic_set(&AFFS_I(inode)->i_opencnt, 0);
1da177e4 LT	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
79bda4d5	71	if (affs_test_opt(sbi->s_flags, SF_SETMODE))
1da177e4 LT	72	inode->i_mode = sbi->s_mode;
1da177e4 LT	73	else
c1618208	74	inode->i_mode = affs_prot_to_mode(prot);
1da177e4 LT	75
1da177e4 LT	76	id = be16_to_cpu(tail->uid);
79bda4d5	77	if (id == 0 \|\| affs_test_opt(sbi->s_flags, SF_SETUID))
1da177e4	78	inode->i_uid = sbi->s_uid;
79bda4d5	79	else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
8fed10be	80	i_uid_write(inode, 0);
1da177e4	81	else
8fed10be	82	i_uid_write(inode, id);
1da177e4 LT	83
1da177e4 LT	84	id = be16_to_cpu(tail->gid);
79bda4d5	85	if (id == 0 \|\| affs_test_opt(sbi->s_flags, SF_SETGID))
1da177e4	86	inode->i_gid = sbi->s_gid;
79bda4d5	87	else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS))
8fed10be	88	i_gid_write(inode, 0);
1da177e4	89	else
8fed10be	90	i_gid_write(inode, id);
1da177e4 LT	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	/* fall through */
	97	case ST_USERDIR:
	98	if (be32_to_cpu(tail->stype) == ST_USERDIR \|\|
79bda4d5	99	affs_test_opt(sbi->s_flags, SF_SETMODE)) {
1da177e4 LT	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	} else
	108	inode->i_mode = S_IRUGO \| S_IXUGO \| S_IWUSR \| S_IFDIR;
1da177e4 LT	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 0
	116	affs_warning(sb, "read_inode", "inode is LINKDIR");
	117	goto bad_inode;
	118	#else
	119	inode->i_mode \|= S_IFDIR;
c765d479	120	/* ... and leave ->i_op and ->i_fop pointing to empty */
1da177e4 LT	121	break;
	122	#endif
	123	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)
bfe86848	137	set_nlink(inode, 2);
79bda4d5	138	inode->i_mapping->a_ops = affs_test_opt(sbi->s_flags, SF_OFS) ?
a0016ff2	139	&affs_aops_ofs : &affs_aops;
1da177e4 LT	140	inode->i_op = &affs_file_inode_operations;
	141	inode->i_fop = &affs_file_operations;
	142	break;
	143	case ST_SOFTLINK:
f1bf9072	144	inode->i_size = strlen((char *)AFFS_HEAD(bh)->table);
1da177e4	145	inode->i_mode \|= S_IFLNK;
21fc61c7	146	inode_nohighmem(inode);
1da177e4 LT	147	inode->i_op = &affs_symlink_inode_operations;
	148	inode->i_data.a_ops = &affs_symlink_aops;
	149	break;
	150	}
	151
	152	inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
	153	= (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
	154	be32_to_cpu(tail->change.mins) * 60 +
	155	be32_to_cpu(tail->change.ticks) / 50 +
	156	((8 * 365 + 2) * 24 * 60 * 60)) +
	157	sys_tz.tz_minuteswest * 60;
	158	inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
	159	affs_brelse(bh);
210f8559 DH	160	unlock_new_inode(inode);
210f8559 DH	161	return inode;
1da177e4 LT	162
1da177e4 LT	163	bad_inode:
1da177e4	164	affs_brelse(bh);
210f8559 DH	165	iget_failed(inode);
210f8559 DH	166	return ERR_PTR(-EIO);
1da177e4 LT	167	}
	168
	169	int
a9185b41	170	affs_write_inode(struct inode inode, struct writeback_control wbc)
1da177e4 LT	171	{
	172	struct super_block *sb = inode->i_sb;
	173	struct buffer_head *bh;
	174	struct affs_tail *tail;
	175	uid_t uid;
	176	gid_t gid;
	177
9606d9aa	178	pr_debug("write_inode(%lu)\n", inode->i_ino);
1da177e4 LT	179
	180	if (!inode->i_nlink)
	181	// possibly free block
	182	return 0;
	183	bh = affs_bread(sb, inode->i_ino);
	184	if (!bh) {
	185	affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
	186	return -EIO;
	187	}
	188	tail = AFFS_TAIL(sb, bh);
	189	if (tail->stype == cpu_to_be32(ST_ROOT)) {
c1618208 FF	190	affs_secs_to_datestamp(inode->i_mtime.tv_sec,
c1618208 FF	191	&AFFS_ROOT_TAIL(sb, bh)->root_change);
1da177e4 LT	192	} else {
	193	tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
	194	tail->size = cpu_to_be32(inode->i_size);
c1618208	195	affs_secs_to_datestamp(inode->i_mtime.tv_sec, &tail->change);
1da177e4	196	if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
8fed10be EB	197	uid = i_uid_read(inode);
8fed10be EB	198	gid = i_gid_read(inode);
79bda4d5	199	if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) {
8fed10be EB	200	if (uid == 0 \|\| uid == 0xFFFF)
	201	uid = uid ^ ~0;
	202	if (gid == 0 \|\| gid == 0xFFFF)
	203	gid = gid ^ ~0;
1da177e4	204	}
79bda4d5	205	if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID))
1da177e4	206	tail->uid = cpu_to_be16(uid);
79bda4d5	207	if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETGID))
1da177e4 LT	208	tail->gid = cpu_to_be16(gid);
	209	}
	210	}
	211	affs_fix_checksum(sb, bh);
	212	mark_buffer_dirty_inode(bh, inode);
	213	affs_brelse(bh);
	214	affs_free_prealloc(inode);
	215	return 0;
	216	}
	217
	218	int
	219	affs_notify_change(struct dentry dentry, struct iattr attr)
	220	{
2b0143b5	221	struct inode *inode = d_inode(dentry);
1da177e4 LT	222	int error;
1da177e4 LT	223
9606d9aa	224	pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid);
1da177e4	225
31051c85	226	error = setattr_prepare(dentry, attr);
1da177e4 LT	227	if (error)
	228	goto out;
	229
a0016ff2	230	if (((attr->ia_valid & ATTR_UID) &&
79bda4d5	231	affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) \|\|
a0016ff2	232	((attr->ia_valid & ATTR_GID) &&
79bda4d5	233	affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) \|\|
1da177e4	234	((attr->ia_valid & ATTR_MODE) &&
a0016ff2 FF	235	(AFFS_SB(inode->i_sb)->s_flags &
a0016ff2 FF	236	(AFFS_MOUNT_SF_SETMODE \| AFFS_MOUNT_SF_IMMUTABLE)))) {
79bda4d5	237	if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET))
1da177e4 LT	238	error = -EPERM;
	239	goto out;
	240	}
	241
1025774c CH	242	if ((attr->ia_valid & ATTR_SIZE) &&
1025774c CH	243	attr->ia_size != i_size_read(inode)) {
1dc1834f	244	error = inode_newsize_ok(inode, attr->ia_size);
1025774c CH	245	if (error)
1025774c CH	246	return error;
1dc1834f MS	247
	248	truncate_setsize(inode, attr->ia_size);
	249	affs_truncate(inode);
1025774c CH	250	}
	251
	252	setattr_copy(inode, attr);
	253	mark_inode_dirty(inode);
	254
	255	if (attr->ia_valid & ATTR_MODE)
c1618208	256	affs_mode_to_prot(inode);
1da177e4 LT	257	out:
	258	return error;
	259	}
	260
1da177e4	261	void
f053ddde	262	affs_evict_inode(struct inode *inode)
1da177e4	263	{
dca3c336	264	unsigned long cache_page;
9606d9aa FF	265	pr_debug("evict_inode(ino=%lu, nlink=%u)\n",
9606d9aa FF	266	inode->i_ino, inode->i_nlink);
91b0abe3	267	truncate_inode_pages_final(&inode->i_data);
1da177e4	268
f053ddde AV	269	if (!inode->i_nlink) {
	270	inode->i_size = 0;
	271	affs_truncate(inode);
	272	}
dca3c336	273
f053ddde	274	invalidate_inode_buffers(inode);
dbd5768f	275	clear_inode(inode);
dca3c336 RZ	276	affs_free_prealloc(inode);
dca3c336 RZ	277	cache_page = (unsigned long)AFFS_I(inode)->i_lc;
1da177e4	278	if (cache_page) {
9606d9aa	279	pr_debug("freeing ext cache\n");
1da177e4 LT	280	AFFS_I(inode)->i_lc = NULL;
	281	AFFS_I(inode)->i_ac = NULL;
	282	free_page(cache_page);
	283	}
	284	affs_brelse(AFFS_I(inode)->i_ext_bh);
	285	AFFS_I(inode)->i_ext_last = ~1;
	286	AFFS_I(inode)->i_ext_bh = NULL;
f053ddde AV	287
	288	if (!inode->i_nlink)
	289	affs_free_block(inode->i_sb, inode->i_ino);
1da177e4 LT	290	}
	291
	292	struct inode *
	293	affs_new_inode(struct inode *dir)
	294	{
	295	struct super_block *sb = dir->i_sb;
	296	struct inode *inode;
	297	u32 block;
	298	struct buffer_head *bh;
	299
	300	if (!(inode = new_inode(sb)))
	301	goto err_inode;
	302
	303	if (!(block = affs_alloc_block(dir, dir->i_ino)))
	304	goto err_block;
	305
	306	bh = affs_getzeroblk(sb, block);
	307	if (!bh)
	308	goto err_bh;
	309	mark_buffer_dirty_inode(bh, inode);
	310	affs_brelse(bh);
	311
21559981 DH	312	inode->i_uid = current_fsuid();
21559981 DH	313	inode->i_gid = current_fsgid();
1da177e4	314	inode->i_ino = block;
bfe86848	315	set_nlink(inode, 1);
02027d42	316	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
dca3c336	317	atomic_set(&AFFS_I(inode)->i_opencnt, 0);
1da177e4 LT	318	AFFS_I(inode)->i_blkcnt = 0;
	319	AFFS_I(inode)->i_lc = NULL;
	320	AFFS_I(inode)->i_lc_size = 0;
	321	AFFS_I(inode)->i_lc_shift = 0;
	322	AFFS_I(inode)->i_lc_mask = 0;
	323	AFFS_I(inode)->i_ac = NULL;
	324	AFFS_I(inode)->i_ext_bh = NULL;
	325	AFFS_I(inode)->mmu_private = 0;
	326	AFFS_I(inode)->i_protect = 0;
	327	AFFS_I(inode)->i_lastalloc = 0;
	328	AFFS_I(inode)->i_pa_cnt = 0;
	329	AFFS_I(inode)->i_extcnt = 1;
	330	AFFS_I(inode)->i_ext_last = ~1;
	331
	332	insert_inode_hash(inode);
	333
	334	return inode;
	335
	336	err_bh:
	337	affs_free_block(sb, block);
	338	err_block:
	339	iput(inode);
	340	err_inode:
	341	return NULL;
	342	}
	343
	344	/*
	345	* Add an entry to a directory. Create the header block
	346	* and insert it into the hash table.
	347	*/
	348
	349	int
	350	affs_add_entry(struct inode dir, struct inode inode, struct dentry *dentry, s32 type)
	351	{
	352	struct super_block *sb = dir->i_sb;
	353	struct buffer_head *inode_bh = NULL;
78f444f6	354	struct buffer_head *bh;
1da177e4 LT	355	u32 block = 0;
	356	int retval;
	357
08fe100d GU	358	pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__,
08fe100d GU	359	dir->i_ino, inode->i_ino, dentry, type);
1da177e4 LT	360
	361	retval = -EIO;
	362	bh = affs_bread(sb, inode->i_ino);
	363	if (!bh)
	364	goto done;
	365
	366	affs_lock_link(inode);
	367	switch (type) {
	368	case ST_LINKFILE:
	369	case ST_LINKDIR:
1da177e4 LT	370	retval = -ENOSPC;
	371	block = affs_alloc_block(dir, dir->i_ino);
	372	if (!block)
	373	goto err;
	374	retval = -EIO;
dca3c336	375	inode_bh = bh;
1da177e4 LT	376	bh = affs_getzeroblk(sb, block);
	377	if (!bh)
	378	goto err;
	379	break;
	380	default:
	381	break;
	382	}
	383
	384	AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
	385	AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
	386	affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
	387	AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
	388	AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
	389
	390	if (inode_bh) {
	391	__be32 chain;
	392	chain = AFFS_TAIL(sb, inode_bh)->link_chain;
	393	AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
	394	AFFS_TAIL(sb, bh)->link_chain = chain;
	395	AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
	396	affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
	397	mark_buffer_dirty_inode(inode_bh, inode);
bfe86848	398	set_nlink(inode, 2);
7de9c6ee	399	ihold(inode);
1da177e4 LT	400	}
	401	affs_fix_checksum(sb, bh);
	402	mark_buffer_dirty_inode(bh, inode);
	403	dentry->d_fsdata = (void *)(long)bh->b_blocknr;
	404
	405	affs_lock_dir(dir);
	406	retval = affs_insert_hash(dir, bh);
	407	mark_buffer_dirty_inode(bh, inode);
	408	affs_unlock_dir(dir);
	409	affs_unlock_link(inode);
	410
	411	d_instantiate(dentry, inode);
	412	done:
	413	affs_brelse(inode_bh);
	414	affs_brelse(bh);
	415	return retval;
	416	err:
	417	if (block)
	418	affs_free_block(sb, block);
	419	affs_unlock_link(inode);
	420	goto done;
	421	}