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

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/fs/adfs/inode.c
 *
 *  Copyright (C) 1997-1999 Russell King
 */
#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, ADFS_I(inode)->indaddr,
					 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 void adfs_write_failed(struct address_space *mapping, loff_t to)
{
	struct inode *inode = mapping->host;

	if (to > inode->i_size)
		truncate_pagecache(inode, inode->i_size);
}

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))
		adfs_write_failed(mapping, pos + len);

	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_filetype(ADFS_I(inode)->loadaddr)) {
	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 ia_mode)
{
	struct adfs_sb_info *asb = ADFS_SB(sb);
	umode_t mode;
	int attr;

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

	/* Directories do not have read/write permissions on the media */
	if (S_ISDIR(inode->i_mode))
		return ADFS_NDA_DIRECTORY;

	attr = 0;
	mode = ia_mode & asb->s_owner_mask;
	if (mode & S_IRUGO)
		attr |= ADFS_NDA_OWNER_READ;
	if (mode & S_IWUGO)
		attr |= ADFS_NDA_OWNER_WRITE;

	mode = ia_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;
}

static const s64 nsec_unix_epoch_diff_risc_os_epoch = 2208988800000000000LL;

/*
 * 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 timespec64 *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)
	 */
	s64 nsec;

	if (!adfs_inode_is_stamped(inode))
		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_timespec64(nsec);
	return;

 cur_time:
	*tv = current_time(inode);
	return;

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

/* Convert an Unix time to ADFS time for an entry that is already stamped. */
static void adfs_unix2adfs_time(struct inode *inode,
				const struct timespec64 *ts)
{
	s64 cs, nsec = timespec64_to_ns(ts);

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

	/* convert from nanoseconds to centiseconds */
	cs = div_s64(nsec, 10000000);

	cs = clamp_t(s64, cs, 0, 0xffffffffff);

	ADFS_I(inode)->loadaddr &= ~0xff;
	ADFS_I(inode)->loadaddr |= (cs >> 32) & 0xff;
	ADFS_I(inode)->execaddr = cs;
}

/*
 * 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->indaddr;
	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)->indaddr   = obj->indaddr;
	ADFS_I(inode)->loadaddr  = obj->loadaddr;
	ADFS_I(inode)->execaddr  = obj->execaddr;
	ADFS_I(inode)->attr      = obj->attr;

	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;
	}

	inode_fake_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 user_namespace *mnt_userns, struct dentry *dentry,
		   struct iattr *attr)
{
	struct inode *inode = d_inode(dentry);
	struct super_block *sb = inode->i_sb;
	unsigned int ia_valid = attr->ia_valid;
	int error;
	
	error = setattr_prepare(&init_user_ns, dentry, 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 && !uid_eq(attr->ia_uid, ADFS_SB(sb)->s_uid)) ||
	    (ia_valid & ATTR_GID && !gid_eq(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 && adfs_inode_is_stamped(inode)) {
		adfs_unix2adfs_time(inode, &attr->ia_mtime);
		adfs_adfs2unix_time(&inode->i_mtime, inode);
	}

	/*
	 * 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, attr->ia_mode);
		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.indaddr	= ADFS_I(inode)->indaddr;
	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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/*
	3	* linux/fs/adfs/inode.c
	4	*
	5	* Copyright (C) 1997-1999 Russell King
1da177e4	6	*/
1da177e4	7	#include <linux/buffer_head.h>
a9185b41	8	#include <linux/writeback.h>
1da177e4 LT	9	#include "adfs.h"
	10
	11	/*
	12	* Lookup/Create a block at offset 'block' into 'inode'. We currently do
	13	* not support creation of new blocks, so we return -EIO for this case.
	14	*/
	15	static int
	16	adfs_get_block(struct inode inode, sector_t block, struct buffer_head bh,
	17	int create)
	18	{
1da177e4 LT	19	if (!create) {
	20	if (block >= inode->i_blocks)
	21	goto abort_toobig;
	22
25e5d4df RK	23	block = __adfs_block_map(inode->i_sb, ADFS_I(inode)->indaddr,
25e5d4df RK	24	block);
1da177e4 LT	25	if (block)
	26	map_bh(bh, inode->i_sb, block);
	27	return 0;
	28	}
	29	/* don't support allocation of blocks yet */
	30	return -EIO;
	31
1da177e4 LT	32	abort_toobig:
	33	return 0;
	34	}
	35
	36	static int adfs_writepage(struct page page, struct writeback_control wbc)
	37	{
	38	return block_write_full_page(page, adfs_get_block, wbc);
	39	}
	40
	41	static int adfs_readpage(struct file file, struct page page)
	42	{
	43	return block_read_full_page(page, adfs_get_block);
	44	}
	45
62295183 MS	46	static void adfs_write_failed(struct address_space *mapping, loff_t to)
	47	{
	48	struct inode *inode = mapping->host;
	49
	50	if (to > inode->i_size)
7caef267	51	truncate_pagecache(inode, inode->i_size);
62295183 MS	52	}
62295183 MS	53
b4585729 NP	54	static int adfs_write_begin(struct file file, struct address_space mapping,
	55	loff_t pos, unsigned len, unsigned flags,
	56	struct page pagep, void fsdata)
1da177e4	57	{
282dc178 CH	58	int ret;
282dc178 CH	59
b4585729	60	*pagep = NULL;
282dc178	61	ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
b4585729 NP	62	adfs_get_block,
b4585729 NP	63	&ADFS_I(mapping->host)->mmu_private);
62295183 MS	64	if (unlikely(ret))
62295183 MS	65	adfs_write_failed(mapping, pos + len);
282dc178 CH	66
282dc178 CH	67	return ret;
1da177e4 LT	68	}
	69
	70	static sector_t _adfs_bmap(struct address_space *mapping, sector_t block)
	71	{
	72	return generic_block_bmap(mapping, block, adfs_get_block);
	73	}
	74
f5e54d6e	75	static const struct address_space_operations adfs_aops = {
1da177e4 LT	76	.readpage = adfs_readpage,
1da177e4 LT	77	.writepage = adfs_writepage,
b4585729 NP	78	.write_begin = adfs_write_begin,
b4585729 NP	79	.write_end = generic_write_end,
1da177e4 LT	80	.bmap = _adfs_bmap
	81	};
	82
1da177e4 LT	83	/*
	84	* Convert ADFS attributes and filetype to Linux permission.
	85	*/
	86	static umode_t
	87	adfs_atts2mode(struct super_block sb, struct inode inode)
	88	{
da23ef05	89	unsigned int attr = ADFS_I(inode)->attr;
1da177e4 LT	90	umode_t mode, rmask;
	91	struct adfs_sb_info *asb = ADFS_SB(sb);
	92
	93	if (attr & ADFS_NDA_DIRECTORY) {
	94	mode = S_IRUGO & asb->s_owner_mask;
	95	return S_IFDIR \| S_IXUGO \| mode;
	96	}
	97
b4ed8f75	98	switch (adfs_filetype(ADFS_I(inode)->loadaddr)) {
1da177e4 LT	99	case 0xfc0: /* LinkFS */
	100	return S_IFLNK\|S_IRWXUGO;
	101
	102	case 0xfe6: /* UnixExec */
	103	rmask = S_IRUGO \| S_IXUGO;
	104	break;
	105
	106	default:
	107	rmask = S_IRUGO;
	108	}
	109
	110	mode = S_IFREG;
	111
	112	if (attr & ADFS_NDA_OWNER_READ)
	113	mode \|= rmask & asb->s_owner_mask;
	114
	115	if (attr & ADFS_NDA_OWNER_WRITE)
	116	mode \|= S_IWUGO & asb->s_owner_mask;
	117
	118	if (attr & ADFS_NDA_PUBLIC_READ)
	119	mode \|= rmask & asb->s_other_mask;
	120
	121	if (attr & ADFS_NDA_PUBLIC_WRITE)
	122	mode \|= S_IWUGO & asb->s_other_mask;
	123	return mode;
	124	}
	125
	126	/*
	127	* Convert Linux permission to ADFS attribute. We try to do the reverse
	128	* of atts2mode, but there is not a 1:1 translation.
	129	*/
81916245 RK	130	static int adfs_mode2atts(struct super_block sb, struct inode inode,
81916245 RK	131	umode_t ia_mode)
1da177e4	132	{
81916245	133	struct adfs_sb_info *asb = ADFS_SB(sb);
1da177e4 LT	134	umode_t mode;
1da177e4 LT	135	int attr;
1da177e4 LT	136
	137	/* FIXME: should we be able to alter a link? */
	138	if (S_ISLNK(inode->i_mode))
	139	return ADFS_I(inode)->attr;
	140
81916245	141	/* Directories do not have read/write permissions on the media */
1da177e4	142	if (S_ISDIR(inode->i_mode))
81916245	143	return ADFS_NDA_DIRECTORY;
1da177e4	144
81916245 RK	145	attr = 0;
81916245 RK	146	mode = ia_mode & asb->s_owner_mask;
1da177e4 LT	147	if (mode & S_IRUGO)
	148	attr \|= ADFS_NDA_OWNER_READ;
	149	if (mode & S_IWUGO)
	150	attr \|= ADFS_NDA_OWNER_WRITE;
	151
81916245	152	mode = ia_mode & asb->s_other_mask;
1da177e4 LT	153	mode &= ~asb->s_owner_mask;
	154	if (mode & S_IRUGO)
	155	attr \|= ADFS_NDA_PUBLIC_READ;
	156	if (mode & S_IWUGO)
	157	attr \|= ADFS_NDA_PUBLIC_WRITE;
	158
	159	return attr;
	160	}
	161
eeeb9dd9 RK	162	static const s64 nsec_unix_epoch_diff_risc_os_epoch = 2208988800000000000LL;
eeeb9dd9 RK	163
1da177e4 LT	164	/*
1da177e4 LT	165	* Convert an ADFS time to Unix time. ADFS has a 40-bit centi-second time
7a9730af SS	166	* referenced to 1 Jan 1900 (til 2248) so we need to discard 2208988800 seconds
7a9730af SS	167	* of time to convert from RISC OS epoch to Unix epoch.
1da177e4 LT	168	*/
1da177e4 LT	169	static void
d9edcbc4	170	adfs_adfs2unix_time(struct timespec64 tv, struct inode inode)
1da177e4 LT	171	{
1da177e4 LT	172	unsigned int high, low;
7a9730af SS	173	/* 01 Jan 1970 00:00:00 (Unix epoch) as nanoseconds since
	174	* 01 Jan 1900 00:00:00 (RISC OS epoch)
	175	*/
7a9730af	176	s64 nsec;
1da177e4	177
b4ed8f75	178	if (!adfs_inode_is_stamped(inode))
1da177e4 LT	179	goto cur_time;
1da177e4 LT	180
7a9730af SS	181	high = ADFS_I(inode)->loadaddr & 0xFF; /* top 8 bits of timestamp */
7a9730af SS	182	low = ADFS_I(inode)->execaddr; /* bottom 32 bits of timestamp */
1da177e4	183
7a9730af SS	184	/* convert 40-bit centi-seconds to 32-bit seconds
	185	* going via nanoseconds to retain precision
	186	*/
	187	nsec = (((s64) high << 32) \| (s64) low) * 10000000; /* cs to ns */
1da177e4 LT	188
1da177e4 LT	189	/* Files dated pre 01 Jan 1970 00:00:00. */
7a9730af	190	if (nsec < nsec_unix_epoch_diff_risc_os_epoch)
1da177e4 LT	191	goto too_early;
1da177e4 LT	192
7a9730af SS	193	/* convert from RISC OS to Unix epoch */
7a9730af SS	194	nsec -= nsec_unix_epoch_diff_risc_os_epoch;
1da177e4	195
d9edcbc4	196	*tv = ns_to_timespec64(nsec);
1da177e4 LT	197	return;
	198
	199	cur_time:
d9edcbc4	200	*tv = current_time(inode);
1da177e4 LT	201	return;
	202
	203	too_early:
	204	tv->tv_sec = tv->tv_nsec = 0;
	205	return;
1da177e4 LT	206	}
1da177e4 LT	207
eeeb9dd9 RK	208	/* Convert an Unix time to ADFS time for an entry that is already stamped. */
	209	static void adfs_unix2adfs_time(struct inode *inode,
	210	const struct timespec64 *ts)
1da177e4	211	{
eeeb9dd9	212	s64 cs, nsec = timespec64_to_ns(ts);
1da177e4	213
eeeb9dd9 RK	214	/* convert from Unix to RISC OS epoch */
eeeb9dd9 RK	215	nsec += nsec_unix_epoch_diff_risc_os_epoch;
1da177e4	216
eeeb9dd9 RK	217	/* convert from nanoseconds to centiseconds */
	218	cs = div_s64(nsec, 10000000);
	219
	220	cs = clamp_t(s64, cs, 0, 0xffffffffff);
	221
	222	ADFS_I(inode)->loadaddr &= ~0xff;
	223	ADFS_I(inode)->loadaddr \|= (cs >> 32) & 0xff;
	224	ADFS_I(inode)->execaddr = cs;
1da177e4 LT	225	}
	226
	227	/*
	228	* Fill in the inode information from the object information.
	229	*
	230	* Note that this is an inode-less filesystem, so we can't use the inode
	231	* number to reference the metadata on the media. Instead, we use the
	232	* inode number to hold the object ID, which in turn will tell us where
	233	* the data is held. We also save the parent object ID, and with these
	234	* two, we can locate the metadata.
	235	*
	236	* This does mean that we rely on an objects parent remaining the same at
	237	* all times - we cannot cope with a cross-directory rename (yet).
	238	*/
	239	struct inode *
	240	adfs_iget(struct super_block sb, struct object_info obj)
	241	{
	242	struct inode *inode;
	243
	244	inode = new_inode(sb);
	245	if (!inode)
	246	goto out;
	247
	248	inode->i_uid = ADFS_SB(sb)->s_uid;
	249	inode->i_gid = ADFS_SB(sb)->s_gid;
5ed70bb4	250	inode->i_ino = obj->indaddr;
1da177e4	251	inode->i_size = obj->size;
bfe86848	252	set_nlink(inode, 2);
1da177e4 LT	253	inode->i_blocks = (inode->i_size + sb->s_blocksize - 1) >>
	254	sb->s_blocksize_bits;
	255
	256	/*
	257	* we need to save the parent directory ID so that
	258	* write_inode can update the directory information
	259	* for this file. This will need special handling
	260	* for cross-directory renames.
	261	*/
	262	ADFS_I(inode)->parent_id = obj->parent_id;
25e5d4df	263	ADFS_I(inode)->indaddr = obj->indaddr;
1da177e4 LT	264	ADFS_I(inode)->loadaddr = obj->loadaddr;
	265	ADFS_I(inode)->execaddr = obj->execaddr;
	266	ADFS_I(inode)->attr = obj->attr;
1da177e4 LT	267
1da177e4 LT	268	inode->i_mode = adfs_atts2mode(sb, inode);
d9edcbc4	269	adfs_adfs2unix_time(&inode->i_mtime, inode);
1da177e4 LT	270	inode->i_atime = inode->i_mtime;
	271	inode->i_ctime = inode->i_mtime;
	272
	273	if (S_ISDIR(inode->i_mode)) {
	274	inode->i_op = &adfs_dir_inode_operations;
	275	inode->i_fop = &adfs_dir_operations;
	276	} else if (S_ISREG(inode->i_mode)) {
	277	inode->i_op = &adfs_file_inode_operations;
	278	inode->i_fop = &adfs_file_operations;
	279	inode->i_mapping->a_ops = &adfs_aops;
	280	ADFS_I(inode)->mmu_private = inode->i_size;
	281	}
	282
d8e78da8	283	inode_fake_hash(inode);
1da177e4 LT	284
	285	out:
	286	return inode;
	287	}
	288
	289	/*
	290	* Validate and convert a changed access mode/time to their ADFS equivalents.
	291	* adfs_write_inode will actually write the information back to the directory
	292	* later.
	293	*/
	294	int
549c7297 CB	295	adfs_notify_change(struct user_namespace mnt_userns, struct dentry dentry,
549c7297 CB	296	struct iattr *attr)
1da177e4	297	{
2b0143b5	298	struct inode *inode = d_inode(dentry);
1da177e4 LT	299	struct super_block *sb = inode->i_sb;
	300	unsigned int ia_valid = attr->ia_valid;
	301	int error;
	302
2f221d6f	303	error = setattr_prepare(&init_user_ns, dentry, attr);
1da177e4 LT	304
	305	/*
	306	* we can't change the UID or GID of any file -
	307	* we have a global UID/GID in the superblock
	308	*/
c010d1ff EB	309	if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, ADFS_SB(sb)->s_uid)) \|\|
c010d1ff EB	310	(ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, ADFS_SB(sb)->s_gid)))
1da177e4 LT	311	error = -EPERM;
	312
	313	if (error)
	314	goto out;
	315
15c6fd97	316	/* XXX: this is missing some actual on-disk truncation.. */
1da177e4	317	if (ia_valid & ATTR_SIZE)
2c27c65e	318	truncate_setsize(inode, attr->ia_size);
1da177e4	319
eeeb9dd9 RK	320	if (ia_valid & ATTR_MTIME && adfs_inode_is_stamped(inode)) {
	321	adfs_unix2adfs_time(inode, &attr->ia_mtime);
	322	adfs_adfs2unix_time(&inode->i_mtime, inode);
1da177e4	323	}
eeeb9dd9	324
1da177e4 LT	325	/*
	326	* FIXME: should we make these == to i_mtime since we don't
	327	* have the ability to represent them in our filesystem?
	328	*/
	329	if (ia_valid & ATTR_ATIME)
	330	inode->i_atime = attr->ia_atime;
	331	if (ia_valid & ATTR_CTIME)
	332	inode->i_ctime = attr->ia_ctime;
	333	if (ia_valid & ATTR_MODE) {
81916245	334	ADFS_I(inode)->attr = adfs_mode2atts(sb, inode, attr->ia_mode);
1da177e4 LT	335	inode->i_mode = adfs_atts2mode(sb, inode);
	336	}
	337
	338	/*
	339	* FIXME: should we be marking this inode dirty even if
	340	* we don't have any metadata to write back?
	341	*/
	342	if (ia_valid & (ATTR_SIZE \| ATTR_MTIME \| ATTR_MODE))
	343	mark_inode_dirty(inode);
	344	out:
1da177e4 LT	345	return error;
	346	}
	347
	348	/*
	349	* write an existing inode back to the directory, and therefore the disk.
	350	* The adfs-specific inode data has already been updated by
	351	* adfs_notify_change()
	352	*/
a9185b41	353	int adfs_write_inode(struct inode inode, struct writeback_control wbc)
1da177e4 LT	354	{
	355	struct super_block *sb = inode->i_sb;
	356	struct object_info obj;
	357	int ret;
	358
25e5d4df	359	obj.indaddr = ADFS_I(inode)->indaddr;
1da177e4 LT	360	obj.name_len = 0;
	361	obj.parent_id = ADFS_I(inode)->parent_id;
	362	obj.loadaddr = ADFS_I(inode)->loadaddr;
	363	obj.execaddr = ADFS_I(inode)->execaddr;
	364	obj.attr = ADFS_I(inode)->attr;
	365	obj.size = inode->i_size;
	366
a9185b41	367	ret = adfs_dir_update(sb, &obj, wbc->sync_mode == WB_SYNC_ALL);
1da177e4 LT	368	return ret;
1da177e4 LT	369	}