Release 4.14 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;
}

Contributors
Person
Tokens
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CommitProp
Linus Torvalds (pre-git)
75
90.36%
2
40.00%
Linus Torvalds
7
8.43%
2
40.00%
Andries E. Brouwer
1
1.20%
1
20.00%
Total
83
100.00%
5
100.00%



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

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Linus Torvalds (pre-git)
19
73.08%
1
50.00%
Andrew Morton
7
26.92%
1
50.00%
Total
26
100.00%
2
100.00%



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

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Linus Torvalds (pre-git)
24
100.00%
2
100.00%
Total
24
100.00%
2
100.00%



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);
}

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Marco Stornelli
40
100.00%
1
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40
100.00%
1
100.00%



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;
}

Contributors
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CommitProp
Nicholas Piggin
36
38.30%
1
16.67%
Linus Torvalds (pre-git)
31
32.98%
2
33.33%
Christoph Hellwig
21
22.34%
1
16.67%
Marco Stornelli
3
3.19%
1
16.67%
Linus Torvalds
3
3.19%
1
16.67%
Total
94
100.00%
6
100.00%



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

Contributors
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CommitProp
Linus Torvalds (pre-git)
22
91.67%
1
50.00%
Andrew Morton
2
8.33%
1
50.00%
Total
24
100.00%
2
100.00%


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;
}

Contributors
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CommitProp
Linus Torvalds (pre-git)
142
86.59%
3
50.00%
Dave Jones
15
9.15%
1
16.67%
Stuart Swales
4
2.44%
1
16.67%
Linus Torvalds
3
1.83%
1
16.67%
Total
164
100.00%
6
100.00%

/*
 * 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;
}

Contributors
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CommitProp
Linus Torvalds (pre-git)
122
88.41%
3
60.00%
Dave Jones
13
9.42%
1
20.00%
Linus Torvalds
3
2.17%
1
20.00%
Total
138
100.00%
5
100.00%

/*
 * 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(inode);
	return;

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

Contributors
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Linus Torvalds (pre-git)
45
32.37%
2
33.33%
Stuart Swales
44
31.65%
1
16.67%
Russell King
37
26.62%
1
16.67%
Linus Torvalds
9
6.47%
1
16.67%
Deepa Dinamani
4
2.88%
1
16.67%
Total
139
100.00%
6
100.00%

/*
 * 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);
	}
}

Contributors
Person
Tokens
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Commits
CommitProp
Linus Torvalds (pre-git)
92
87.62%
2
50.00%
Linus Torvalds
13
12.38%
2
50.00%
Total
105
100.00%
4
100.00%

/*
 * 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;
}

Contributors
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Linus Torvalds (pre-git)
237
80.34%
5
45.45%
Linus Torvalds
18
6.10%
1
9.09%
Stuart Swales
11
3.73%
1
9.09%
Andi Kleen
10
3.39%
1
9.09%
Russell King
9
3.05%
1
9.09%
Dave Jones
6
2.03%
1
9.09%
Miklos Szeredi
4
1.36%
1
9.09%
Total
295
100.00%
11
100.00%

/*
 * 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 = d_inode(dentry);
	struct super_block *sb = inode->i_sb;
	unsigned int ia_valid = attr->ia_valid;
	int error;
	
	error = setattr_prepare(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) {
		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;
}

Contributors
Person
Tokens
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Commits
CommitProp
Linus Torvalds (pre-git)
211
88.28%
3
27.27%
Eric W. Biedermann
10
4.18%
1
9.09%
Dave Jones
6
2.51%
1
9.09%
David Howells
3
1.26%
1
9.09%
Linus Torvalds
3
1.26%
1
9.09%
Andi Kleen
2
0.84%
1
9.09%
Jan Kara
2
0.84%
1
9.09%
Nicholas Piggin
1
0.42%
1
9.09%
Christoph Hellwig
1
0.42%
1
9.09%
Total
239
100.00%
11
100.00%

/*
 * 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;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
85
73.28%
4
50.00%
Linus Torvalds
12
10.34%
1
12.50%
Christoph Hellwig
9
7.76%
1
12.50%
Andrey V. Savochkin
9
7.76%
1
12.50%
Al Viro
1
0.86%
1
12.50%
Total
116
100.00%
8
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
1134
73.73%
12
30.00%
Linus Torvalds
71
4.62%
4
10.00%
Stuart Swales
60
3.90%
2
5.00%
Russell King
56
3.64%
2
5.00%
Marco Stornelli
43
2.80%
1
2.50%
Nicholas Piggin
41
2.67%
2
5.00%
Dave Jones
40
2.60%
1
2.50%
Christoph Hellwig
38
2.47%
5
12.50%
Andi Kleen
12
0.78%
1
2.50%
Eric W. Biedermann
10
0.65%
1
2.50%
Andrew Morton
9
0.59%
2
5.00%
Andrey V. Savochkin
9
0.59%
1
2.50%
Miklos Szeredi
4
0.26%
1
2.50%
Deepa Dinamani
4
0.26%
1
2.50%
David Howells
3
0.20%
1
2.50%
Jan Kara
2
0.13%
1
2.50%
Al Viro
1
0.07%
1
2.50%
Andries E. Brouwer
1
0.07%
1
2.50%
Total
1538
100.00%
40
100.00%
Directory: fs/adfs

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