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

/*
 *  linux/fs/adfs/inode.c
 *
 *  Copyright (C) 1997-1999 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/buffer_head.h>
#include <linux/writeback.h>
#include "adfs.h"

/*
 * Lookup/Create a block at offset 'block' into 'inode'.  We currently do
 * not support creation of new blocks, so we return -EIO for this case.
 */
static int
adfs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh,
	       int create)
{
	if (!create) {
		if (block >= inode->i_blocks)
			goto abort_toobig;

		block = __adfs_block_map(inode->i_sb, inode->i_ino, block);
		if (block)
			map_bh(bh, inode->i_sb, block);
		return 0;
	}
	/* don't support allocation of blocks yet */
	return -EIO;

abort_toobig:
	return 0;
}

static int adfs_writepage(struct page *page, struct writeback_control *wbc)
{
	return block_write_full_page(page, adfs_get_block, wbc);
}

static int adfs_readpage(struct file *file, struct page *page)
{
	return block_read_full_page(page, adfs_get_block);
}

static int adfs_write_begin(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata)
{
	int ret;

	*pagep = NULL;
	ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
				adfs_get_block,
				&ADFS_I(mapping->host)->mmu_private);
	if (unlikely(ret)) {
		loff_t isize = mapping->host->i_size;
		if (pos + len > isize)
			vmtruncate(mapping->host, isize);
	}

	return ret;
}

static sector_t _adfs_bmap(struct address_space *mapping, sector_t block)
{
	return generic_block_bmap(mapping, block, adfs_get_block);
}

static const struct address_space_operations adfs_aops = {
	.readpage	= adfs_readpage,
	.writepage	= adfs_writepage,
	.write_begin	= adfs_write_begin,
	.write_end	= generic_write_end,
	.bmap		= _adfs_bmap
};

/*
 * Convert ADFS attributes and filetype to Linux permission.
 */
static umode_t
adfs_atts2mode(struct super_block *sb, struct inode *inode)
{
	unsigned int attr = ADFS_I(inode)->attr;
	umode_t mode, rmask;
	struct adfs_sb_info *asb = ADFS_SB(sb);

	if (attr & ADFS_NDA_DIRECTORY) {
		mode = S_IRUGO & asb->s_owner_mask;
		return S_IFDIR | S_IXUGO | mode;
	}

	switch (ADFS_I(inode)->filetype) {
	case 0xfc0:	/* LinkFS */
		return S_IFLNK|S_IRWXUGO;

	case 0xfe6:	/* UnixExec */
		rmask = S_IRUGO | S_IXUGO;
		break;

	default:
		rmask = S_IRUGO;
	}

	mode = S_IFREG;

	if (attr & ADFS_NDA_OWNER_READ)
		mode |= rmask & asb->s_owner_mask;

	if (attr & ADFS_NDA_OWNER_WRITE)
		mode |= S_IWUGO & asb->s_owner_mask;

	if (attr & ADFS_NDA_PUBLIC_READ)
		mode |= rmask & asb->s_other_mask;

	if (attr & ADFS_NDA_PUBLIC_WRITE)
		mode |= S_IWUGO & asb->s_other_mask;
	return mode;
}

/*
 * Convert Linux permission to ADFS attribute.  We try to do the reverse
 * of atts2mode, but there is not a 1:1 translation.
 */
static int
adfs_mode2atts(struct super_block *sb, struct inode *inode)
{
	umode_t mode;
	int attr;
	struct adfs_sb_info *asb = ADFS_SB(sb);

	/* FIXME: should we be able to alter a link? */
	if (S_ISLNK(inode->i_mode))
		return ADFS_I(inode)->attr;

	if (S_ISDIR(inode->i_mode))
		attr = ADFS_NDA_DIRECTORY;
	else
		attr = 0;

	mode = inode->i_mode & asb->s_owner_mask;
	if (mode & S_IRUGO)
		attr |= ADFS_NDA_OWNER_READ;
	if (mode & S_IWUGO)
		attr |= ADFS_NDA_OWNER_WRITE;

	mode = inode->i_mode & asb->s_other_mask;
	mode &= ~asb->s_owner_mask;
	if (mode & S_IRUGO)
		attr |= ADFS_NDA_PUBLIC_READ;
	if (mode & S_IWUGO)
		attr |= ADFS_NDA_PUBLIC_WRITE;

	return attr;
}

/*
 * Convert an ADFS time to Unix time.  ADFS has a 40-bit centi-second time
 * referenced to 1 Jan 1900 (til 2248) so we need to discard 2208988800 seconds
 * of time to convert from RISC OS epoch to Unix epoch.
 */
static void
adfs_adfs2unix_time(struct timespec *tv, struct inode *inode)
{
	unsigned int high, low;
	/* 01 Jan 1970 00:00:00 (Unix epoch) as nanoseconds since
	 * 01 Jan 1900 00:00:00 (RISC OS epoch)
	 */
	static const s64 nsec_unix_epoch_diff_risc_os_epoch =
							2208988800000000000LL;
	s64 nsec;

	if (ADFS_I(inode)->stamped == 0)
		goto cur_time;

	high = ADFS_I(inode)->loadaddr & 0xFF; /* top 8 bits of timestamp */
	low  = ADFS_I(inode)->execaddr;    /* bottom 32 bits of timestamp */

	/* convert 40-bit centi-seconds to 32-bit seconds
	 * going via nanoseconds to retain precision
	 */
	nsec = (((s64) high << 32) | (s64) low) * 10000000; /* cs to ns */

	/* Files dated pre  01 Jan 1970 00:00:00. */
	if (nsec < nsec_unix_epoch_diff_risc_os_epoch)
		goto too_early;

	/* convert from RISC OS to Unix epoch */
	nsec -= nsec_unix_epoch_diff_risc_os_epoch;

	*tv = ns_to_timespec(nsec);
	return;

 cur_time:
	*tv = CURRENT_TIME;
	return;

 too_early:
	tv->tv_sec = tv->tv_nsec = 0;
	return;
}

/*
 * Convert an Unix time to ADFS time.  We only do this if the entry has a
 * time/date stamp already.
 */
static void
adfs_unix2adfs_time(struct inode *inode, unsigned int secs)
{
	unsigned int high, low;

	if (ADFS_I(inode)->stamped) {
		/* convert 32-bit seconds to 40-bit centi-seconds */
		low  = (secs & 255) * 100;
		high = (secs / 256) * 100 + (low >> 8) + 0x336e996a;

		ADFS_I(inode)->loadaddr = (high >> 24) |
				(ADFS_I(inode)->loadaddr & ~0xff);
		ADFS_I(inode)->execaddr = (low & 255) | (high << 8);
	}
}

/*
 * Fill in the inode information from the object information.
 *
 * Note that this is an inode-less filesystem, so we can't use the inode
 * number to reference the metadata on the media.  Instead, we use the
 * inode number to hold the object ID, which in turn will tell us where
 * the data is held.  We also save the parent object ID, and with these
 * two, we can locate the metadata.
 *
 * This does mean that we rely on an objects parent remaining the same at
 * all times - we cannot cope with a cross-directory rename (yet).
 */
struct inode *
adfs_iget(struct super_block *sb, struct object_info *obj)
{
	struct inode *inode;

	inode = new_inode(sb);
	if (!inode)
		goto out;

	inode->i_uid	 = ADFS_SB(sb)->s_uid;
	inode->i_gid	 = ADFS_SB(sb)->s_gid;
	inode->i_ino	 = obj->file_id;
	inode->i_size	 = obj->size;
	set_nlink(inode, 2);
	inode->i_blocks	 = (inode->i_size + sb->s_blocksize - 1) >>
			    sb->s_blocksize_bits;

	/*
	 * we need to save the parent directory ID so that
	 * write_inode can update the directory information
	 * for this file.  This will need special handling
	 * for cross-directory renames.
	 */
	ADFS_I(inode)->parent_id = obj->parent_id;
	ADFS_I(inode)->loadaddr  = obj->loadaddr;
	ADFS_I(inode)->execaddr  = obj->execaddr;
	ADFS_I(inode)->attr      = obj->attr;
	ADFS_I(inode)->filetype  = obj->filetype;
	ADFS_I(inode)->stamped   = ((obj->loadaddr & 0xfff00000) == 0xfff00000);

	inode->i_mode	 = adfs_atts2mode(sb, inode);
	adfs_adfs2unix_time(&inode->i_mtime, inode);
	inode->i_atime = inode->i_mtime;
	inode->i_ctime = inode->i_mtime;

	if (S_ISDIR(inode->i_mode)) {
		inode->i_op	= &adfs_dir_inode_operations;
		inode->i_fop	= &adfs_dir_operations;
	} else if (S_ISREG(inode->i_mode)) {
		inode->i_op	= &adfs_file_inode_operations;
		inode->i_fop	= &adfs_file_operations;
		inode->i_mapping->a_ops = &adfs_aops;
		ADFS_I(inode)->mmu_private = inode->i_size;
	}

	insert_inode_hash(inode);

out:
	return inode;
}

/*
 * Validate and convert a changed access mode/time to their ADFS equivalents.
 * adfs_write_inode will actually write the information back to the directory
 * later.
 */
int
adfs_notify_change(struct dentry *dentry, struct iattr *attr)
{
	struct inode *inode = dentry->d_inode;
	struct super_block *sb = inode->i_sb;
	unsigned int ia_valid = attr->ia_valid;
	int error;
	
	error = inode_change_ok(inode, attr);

	/*
	 * we can't change the UID or GID of any file -
	 * we have a global UID/GID in the superblock
	 */
	if ((ia_valid & ATTR_UID && attr->ia_uid != ADFS_SB(sb)->s_uid) ||
	    (ia_valid & ATTR_GID && attr->ia_gid != ADFS_SB(sb)->s_gid))
		error = -EPERM;

	if (error)
		goto out;

	/* XXX: this is missing some actual on-disk truncation.. */
	if (ia_valid & ATTR_SIZE)
		truncate_setsize(inode, attr->ia_size);

	if (ia_valid & ATTR_MTIME) {
		inode->i_mtime = attr->ia_mtime;
		adfs_unix2adfs_time(inode, attr->ia_mtime.tv_sec);
	}
	/*
	 * FIXME: should we make these == to i_mtime since we don't
	 * have the ability to represent them in our filesystem?
	 */
	if (ia_valid & ATTR_ATIME)
		inode->i_atime = attr->ia_atime;
	if (ia_valid & ATTR_CTIME)
		inode->i_ctime = attr->ia_ctime;
	if (ia_valid & ATTR_MODE) {
		ADFS_I(inode)->attr = adfs_mode2atts(sb, inode);
		inode->i_mode = adfs_atts2mode(sb, inode);
	}

	/*
	 * FIXME: should we be marking this inode dirty even if
	 * we don't have any metadata to write back?
	 */
	if (ia_valid & (ATTR_SIZE | ATTR_MTIME | ATTR_MODE))
		mark_inode_dirty(inode);
out:
	return error;
}

/*
 * write an existing inode back to the directory, and therefore the disk.
 * The adfs-specific inode data has already been updated by
 * adfs_notify_change()
 */
int adfs_write_inode(struct inode *inode, struct writeback_control *wbc)
{
	struct super_block *sb = inode->i_sb;
	struct object_info obj;
	int ret;

	obj.file_id	= inode->i_ino;
	obj.name_len	= 0;
	obj.parent_id	= ADFS_I(inode)->parent_id;
	obj.loadaddr	= ADFS_I(inode)->loadaddr;
	obj.execaddr	= ADFS_I(inode)->execaddr;
	obj.attr	= ADFS_I(inode)->attr;
	obj.size	= inode->i_size;

	ret = adfs_dir_update(sb, &obj, wbc->sync_mode == WB_SYNC_ALL);
	return ret;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/adfs/inode.c
	3	*
	4	* Copyright (C) 1997-1999 Russell King
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
1da177e4	10	#include <linux/buffer_head.h>
a9185b41	11	#include <linux/writeback.h>
1da177e4 LT	12	#include "adfs.h"
	13
	14	/*
	15	* Lookup/Create a block at offset 'block' into 'inode'. We currently do
	16	* not support creation of new blocks, so we return -EIO for this case.
	17	*/
	18	static int
	19	adfs_get_block(struct inode inode, sector_t block, struct buffer_head bh,
	20	int create)
	21	{
1da177e4 LT	22	if (!create) {
	23	if (block >= inode->i_blocks)
	24	goto abort_toobig;
	25
	26	block = __adfs_block_map(inode->i_sb, inode->i_ino, block);
	27	if (block)
	28	map_bh(bh, inode->i_sb, block);
	29	return 0;
	30	}
	31	/* don't support allocation of blocks yet */
	32	return -EIO;
	33
1da177e4 LT	34	abort_toobig:
	35	return 0;
	36	}
	37
	38	static int adfs_writepage(struct page page, struct writeback_control wbc)
	39	{
	40	return block_write_full_page(page, adfs_get_block, wbc);
	41	}
	42
	43	static int adfs_readpage(struct file file, struct page page)
	44	{
	45	return block_read_full_page(page, adfs_get_block);
	46	}
	47
b4585729 NP	48	static int adfs_write_begin(struct file file, struct address_space mapping,
	49	loff_t pos, unsigned len, unsigned flags,
	50	struct page pagep, void fsdata)
1da177e4	51	{
282dc178 CH	52	int ret;
282dc178 CH	53
b4585729	54	*pagep = NULL;
282dc178	55	ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
b4585729 NP	56	adfs_get_block,
b4585729 NP	57	&ADFS_I(mapping->host)->mmu_private);
282dc178 CH	58	if (unlikely(ret)) {
	59	loff_t isize = mapping->host->i_size;
	60	if (pos + len > isize)
	61	vmtruncate(mapping->host, isize);
	62	}
	63
	64	return ret;
1da177e4 LT	65	}
	66
	67	static sector_t _adfs_bmap(struct address_space *mapping, sector_t block)
	68	{
	69	return generic_block_bmap(mapping, block, adfs_get_block);
	70	}
	71
f5e54d6e	72	static const struct address_space_operations adfs_aops = {
1da177e4 LT	73	.readpage = adfs_readpage,
1da177e4 LT	74	.writepage = adfs_writepage,
b4585729 NP	75	.write_begin = adfs_write_begin,
b4585729 NP	76	.write_end = generic_write_end,
1da177e4 LT	77	.bmap = _adfs_bmap
	78	};
	79
1da177e4 LT	80	/*
	81	* Convert ADFS attributes and filetype to Linux permission.
	82	*/
	83	static umode_t
	84	adfs_atts2mode(struct super_block sb, struct inode inode)
	85	{
da23ef05	86	unsigned int attr = ADFS_I(inode)->attr;
1da177e4 LT	87	umode_t mode, rmask;
	88	struct adfs_sb_info *asb = ADFS_SB(sb);
	89
	90	if (attr & ADFS_NDA_DIRECTORY) {
	91	mode = S_IRUGO & asb->s_owner_mask;
	92	return S_IFDIR \| S_IXUGO \| mode;
	93	}
	94
da23ef05	95	switch (ADFS_I(inode)->filetype) {
1da177e4 LT	96	case 0xfc0: /* LinkFS */
	97	return S_IFLNK\|S_IRWXUGO;
	98
	99	case 0xfe6: /* UnixExec */
	100	rmask = S_IRUGO \| S_IXUGO;
	101	break;
	102
	103	default:
	104	rmask = S_IRUGO;
	105	}
	106
	107	mode = S_IFREG;
	108
	109	if (attr & ADFS_NDA_OWNER_READ)
	110	mode \|= rmask & asb->s_owner_mask;
	111
	112	if (attr & ADFS_NDA_OWNER_WRITE)
	113	mode \|= S_IWUGO & asb->s_owner_mask;
	114
	115	if (attr & ADFS_NDA_PUBLIC_READ)
	116	mode \|= rmask & asb->s_other_mask;
	117
	118	if (attr & ADFS_NDA_PUBLIC_WRITE)
	119	mode \|= S_IWUGO & asb->s_other_mask;
	120	return mode;
	121	}
	122
	123	/*
	124	* Convert Linux permission to ADFS attribute. We try to do the reverse
	125	* of atts2mode, but there is not a 1:1 translation.
	126	*/
	127	static int
	128	adfs_mode2atts(struct super_block sb, struct inode inode)
	129	{
	130	umode_t mode;
	131	int attr;
	132	struct adfs_sb_info *asb = ADFS_SB(sb);
	133
	134	/* FIXME: should we be able to alter a link? */
	135	if (S_ISLNK(inode->i_mode))
	136	return ADFS_I(inode)->attr;
	137
	138	if (S_ISDIR(inode->i_mode))
	139	attr = ADFS_NDA_DIRECTORY;
	140	else
	141	attr = 0;
	142
	143	mode = inode->i_mode & asb->s_owner_mask;
	144	if (mode & S_IRUGO)
	145	attr \|= ADFS_NDA_OWNER_READ;
	146	if (mode & S_IWUGO)
	147	attr \|= ADFS_NDA_OWNER_WRITE;
	148
	149	mode = inode->i_mode & asb->s_other_mask;
	150	mode &= ~asb->s_owner_mask;
	151	if (mode & S_IRUGO)
	152	attr \|= ADFS_NDA_PUBLIC_READ;
	153	if (mode & S_IWUGO)
	154	attr \|= ADFS_NDA_PUBLIC_WRITE;
	155
	156	return attr;
	157	}
	158
	159	/*
160	* Convert an ADFS time to Unix time. ADFS has a 40-bit centi-second time
7a9730af SS	161	* referenced to 1 Jan 1900 (til 2248) so we need to discard 2208988800 seconds
7a9730af SS	162	* of time to convert from RISC OS epoch to Unix epoch.
1da177e4 LT	163	*/
	164	static void
	165	adfs_adfs2unix_time(struct timespec tv, struct inode inode)
	166	{
	167	unsigned int high, low;
7a9730af SS	168	/* 01 Jan 1970 00:00:00 (Unix epoch) as nanoseconds since
	169	* 01 Jan 1900 00:00:00 (RISC OS epoch)
	170	*/
	171	static const s64 nsec_unix_epoch_diff_risc_os_epoch =
	172	2208988800000000000LL;
	173	s64 nsec;
1da177e4 LT	174
	175	if (ADFS_I(inode)->stamped == 0)
	176	goto cur_time;
	177
7a9730af SS	178	high = ADFS_I(inode)->loadaddr & 0xFF; /* top 8 bits of timestamp */
7a9730af SS	179	low = ADFS_I(inode)->execaddr; /* bottom 32 bits of timestamp */
1da177e4	180
7a9730af SS	181	/* convert 40-bit centi-seconds to 32-bit seconds
	182	* going via nanoseconds to retain precision
	183	*/
	184	nsec = (((s64) high << 32) \| (s64) low) * 10000000; /* cs to ns */
1da177e4 LT	185
1da177e4 LT	186	/* Files dated pre 01 Jan 1970 00:00:00. */
7a9730af	187	if (nsec < nsec_unix_epoch_diff_risc_os_epoch)
1da177e4 LT	188	goto too_early;
1da177e4 LT	189
7a9730af SS	190	/* convert from RISC OS to Unix epoch */
7a9730af SS	191	nsec -= nsec_unix_epoch_diff_risc_os_epoch;
1da177e4	192
7a9730af	193	*tv = ns_to_timespec(nsec);
1da177e4 LT	194	return;
	195
	196	cur_time:
7a9730af	197	*tv = CURRENT_TIME;
1da177e4 LT	198	return;
	199
	200	too_early:
	201	tv->tv_sec = tv->tv_nsec = 0;
	202	return;
1da177e4 LT	203	}
	204
	205	/*
	206	* Convert an Unix time to ADFS time. We only do this if the entry has a
	207	* time/date stamp already.
	208	*/
	209	static void
	210	adfs_unix2adfs_time(struct inode *inode, unsigned int secs)
	211	{
	212	unsigned int high, low;
	213
	214	if (ADFS_I(inode)->stamped) {
	215	/* convert 32-bit seconds to 40-bit centi-seconds */
	216	low = (secs & 255) * 100;
	217	high = (secs / 256) * 100 + (low >> 8) + 0x336e996a;
	218
	219	ADFS_I(inode)->loadaddr = (high >> 24) \|
	220	(ADFS_I(inode)->loadaddr & ~0xff);
	221	ADFS_I(inode)->execaddr = (low & 255) \| (high << 8);
	222	}
	223	}
	224
	225	/*
	226	* Fill in the inode information from the object information.
	227	*
	228	* Note that this is an inode-less filesystem, so we can't use the inode
	229	* number to reference the metadata on the media. Instead, we use the
	230	* inode number to hold the object ID, which in turn will tell us where
	231	* the data is held. We also save the parent object ID, and with these
	232	* two, we can locate the metadata.
	233	*
	234	* This does mean that we rely on an objects parent remaining the same at
	235	* all times - we cannot cope with a cross-directory rename (yet).
	236	*/
	237	struct inode *
	238	adfs_iget(struct super_block sb, struct object_info obj)
	239	{
	240	struct inode *inode;
	241
	242	inode = new_inode(sb);
	243	if (!inode)
	244	goto out;
	245
	246	inode->i_uid = ADFS_SB(sb)->s_uid;
	247	inode->i_gid = ADFS_SB(sb)->s_gid;
	248	inode->i_ino = obj->file_id;
	249	inode->i_size = obj->size;
bfe86848	250	set_nlink(inode, 2);
1da177e4 LT	251	inode->i_blocks = (inode->i_size + sb->s_blocksize - 1) >>
	252	sb->s_blocksize_bits;
	253
	254	/*
	255	* we need to save the parent directory ID so that
	256	* write_inode can update the directory information
	257	* for this file. This will need special handling
	258	* for cross-directory renames.
	259	*/
	260	ADFS_I(inode)->parent_id = obj->parent_id;
	261	ADFS_I(inode)->loadaddr = obj->loadaddr;
	262	ADFS_I(inode)->execaddr = obj->execaddr;
	263	ADFS_I(inode)->attr = obj->attr;
da23ef05 SS	264	ADFS_I(inode)->filetype = obj->filetype;
da23ef05 SS	265	ADFS_I(inode)->stamped = ((obj->loadaddr & 0xfff00000) == 0xfff00000);
1da177e4 LT	266
	267	inode->i_mode = adfs_atts2mode(sb, inode);
	268	adfs_adfs2unix_time(&inode->i_mtime, inode);
	269	inode->i_atime = inode->i_mtime;
	270	inode->i_ctime = inode->i_mtime;
	271
	272	if (S_ISDIR(inode->i_mode)) {
	273	inode->i_op = &adfs_dir_inode_operations;
	274	inode->i_fop = &adfs_dir_operations;
	275	} else if (S_ISREG(inode->i_mode)) {
	276	inode->i_op = &adfs_file_inode_operations;
	277	inode->i_fop = &adfs_file_operations;
	278	inode->i_mapping->a_ops = &adfs_aops;
	279	ADFS_I(inode)->mmu_private = inode->i_size;
	280	}
	281
	282	insert_inode_hash(inode);
	283
	284	out:
	285	return inode;
	286	}
	287
	288	/*
	289	* Validate and convert a changed access mode/time to their ADFS equivalents.
	290	* adfs_write_inode will actually write the information back to the directory
	291	* later.
	292	*/
	293	int
	294	adfs_notify_change(struct dentry dentry, struct iattr attr)
	295	{
	296	struct inode *inode = dentry->d_inode;
	297	struct super_block *sb = inode->i_sb;
	298	unsigned int ia_valid = attr->ia_valid;
	299	int error;
	300
1da177e4 LT	301	error = inode_change_ok(inode, attr);
	302
	303	/*
	304	* we can't change the UID or GID of any file -
	305	* we have a global UID/GID in the superblock
	306	*/
	307	if ((ia_valid & ATTR_UID && attr->ia_uid != ADFS_SB(sb)->s_uid) \|\|
	308	(ia_valid & ATTR_GID && attr->ia_gid != ADFS_SB(sb)->s_gid))
	309	error = -EPERM;
	310
	311	if (error)
	312	goto out;
	313
15c6fd97	314	/* XXX: this is missing some actual on-disk truncation.. */
1da177e4	315	if (ia_valid & ATTR_SIZE)
2c27c65e	316	truncate_setsize(inode, attr->ia_size);
1da177e4 LT	317
	318	if (ia_valid & ATTR_MTIME) {
	319	inode->i_mtime = attr->ia_mtime;
	320	adfs_unix2adfs_time(inode, attr->ia_mtime.tv_sec);
	321	}
	322	/*
	323	* FIXME: should we make these == to i_mtime since we don't
	324	* have the ability to represent them in our filesystem?
	325	*/
	326	if (ia_valid & ATTR_ATIME)
	327	inode->i_atime = attr->ia_atime;
	328	if (ia_valid & ATTR_CTIME)
	329	inode->i_ctime = attr->ia_ctime;
	330	if (ia_valid & ATTR_MODE) {
	331	ADFS_I(inode)->attr = adfs_mode2atts(sb, inode);
	332	inode->i_mode = adfs_atts2mode(sb, inode);
	333	}
	334
	335	/*
	336	* FIXME: should we be marking this inode dirty even if
	337	* we don't have any metadata to write back?
	338	*/
	339	if (ia_valid & (ATTR_SIZE \| ATTR_MTIME \| ATTR_MODE))
	340	mark_inode_dirty(inode);
	341	out:
1da177e4 LT	342	return error;
	343	}
	344
	345	/*
	346	* write an existing inode back to the directory, and therefore the disk.
	347	* The adfs-specific inode data has already been updated by
	348	* adfs_notify_change()
	349	*/
a9185b41	350	int adfs_write_inode(struct inode inode, struct writeback_control wbc)
1da177e4 LT	351	{
	352	struct super_block *sb = inode->i_sb;
	353	struct object_info obj;
	354	int ret;
	355
1da177e4 LT	356	obj.file_id = inode->i_ino;
	357	obj.name_len = 0;
	358	obj.parent_id = ADFS_I(inode)->parent_id;
	359	obj.loadaddr = ADFS_I(inode)->loadaddr;
	360	obj.execaddr = ADFS_I(inode)->execaddr;
	361	obj.attr = ADFS_I(inode)->attr;
	362	obj.size = inode->i_size;
	363
a9185b41	364	ret = adfs_dir_update(sb, &obj, wbc->sync_mode == WB_SYNC_ALL);
1da177e4 LT	365	return ret;
1da177e4 LT	366	}