[mirror_ubuntu-jammy-kernel.git] / fs / hpfs / file.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/fs/hpfs/file.c
 *
 *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
 *
 *  file VFS functions
 */

#include "hpfs_fn.h"
#include <linux/mpage.h>
#include <linux/iomap.h>
#include <linux/fiemap.h>

#define BLOCKS(size) (((size) + 511) >> 9)

static int hpfs_file_release(struct inode *inode, struct file *file)
{
	hpfs_lock(inode->i_sb);
	hpfs_write_if_changed(inode);
	hpfs_unlock(inode->i_sb);
	return 0;
}

int hpfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
	struct inode *inode = file->f_mapping->host;
	int ret;

	ret = file_write_and_wait_range(file, start, end);
	if (ret)
		return ret;
	return sync_blockdev(inode->i_sb->s_bdev);
}

/*
 * generic_file_read often calls bmap with non-existing sector,
 * so we must ignore such errors.
 */

static secno hpfs_bmap(struct inode *inode, unsigned file_secno, unsigned *n_secs)
{
	struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
	unsigned n, disk_secno;
	struct fnode *fnode;
	struct buffer_head *bh;
	if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;
	n = file_secno - hpfs_inode->i_file_sec;
	if (n < hpfs_inode->i_n_secs) {
		*n_secs = hpfs_inode->i_n_secs - n;
		return hpfs_inode->i_disk_sec + n;
	}
	if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
	disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
	if (disk_secno == -1) return 0;
	if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
	n = file_secno - hpfs_inode->i_file_sec;
	if (n < hpfs_inode->i_n_secs) {
		*n_secs = hpfs_inode->i_n_secs - n;
		return hpfs_inode->i_disk_sec + n;
	}
	*n_secs = 1;
	return disk_secno;
}

void hpfs_truncate(struct inode *i)
{
	if (IS_IMMUTABLE(i)) return /*-EPERM*/;
	hpfs_lock_assert(i->i_sb);

	hpfs_i(i)->i_n_secs = 0;
	i->i_blocks = 1 + ((i->i_size + 511) >> 9);
	hpfs_i(i)->mmu_private = i->i_size;
	hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
	hpfs_write_inode(i);
	hpfs_i(i)->i_n_secs = 0;
}

static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
{
	int r;
	secno s;
	unsigned n_secs;
	hpfs_lock(inode->i_sb);
	s = hpfs_bmap(inode, iblock, &n_secs);
	if (s) {
		if (bh_result->b_size >> 9 < n_secs)
			n_secs = bh_result->b_size >> 9;
		n_secs = hpfs_search_hotfix_map_for_range(inode->i_sb, s, n_secs);
		if (unlikely(!n_secs)) {
			s = hpfs_search_hotfix_map(inode->i_sb, s);
			n_secs = 1;
		}
		map_bh(bh_result, inode->i_sb, s);
		bh_result->b_size = n_secs << 9;
		goto ret_0;
	}
	if (!create) goto ret_0;
	if (iblock<<9 != hpfs_i(inode)->mmu_private) {
		BUG();
		r = -EIO;
		goto ret_r;
	}
	if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
		hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
		r = -ENOSPC;
		goto ret_r;
	}
	inode->i_blocks++;
	hpfs_i(inode)->mmu_private += 512;
	set_buffer_new(bh_result);
	map_bh(bh_result, inode->i_sb, hpfs_search_hotfix_map(inode->i_sb, s));
	ret_0:
	r = 0;
	ret_r:
	hpfs_unlock(inode->i_sb);
	return r;
}

static int hpfs_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
		unsigned flags, struct iomap *iomap, struct iomap *srcmap)
{
	struct super_block *sb = inode->i_sb;
	unsigned int blkbits = inode->i_blkbits;
	unsigned int n_secs;
	secno s;

	if (WARN_ON_ONCE(flags & (IOMAP_WRITE | IOMAP_ZERO)))
		return -EINVAL;

	iomap->bdev = inode->i_sb->s_bdev;
	iomap->offset = offset;

	hpfs_lock(sb);
	s = hpfs_bmap(inode, offset >> blkbits, &n_secs);
	if (s) {
		n_secs = hpfs_search_hotfix_map_for_range(sb, s,
				min_t(loff_t, n_secs, length));
		if (unlikely(!n_secs)) {
			s = hpfs_search_hotfix_map(sb, s);
			n_secs = 1;
		}
		iomap->type = IOMAP_MAPPED;
		iomap->flags = IOMAP_F_MERGED;
		iomap->addr = (u64)s << blkbits;
		iomap->length = (u64)n_secs << blkbits;
	} else {
		iomap->type = IOMAP_HOLE;
		iomap->addr = IOMAP_NULL_ADDR;
		iomap->length = 1 << blkbits;
	}

	hpfs_unlock(sb);
	return 0;
}

static const struct iomap_ops hpfs_iomap_ops = {
	.iomap_begin		= hpfs_iomap_begin,
};

static int hpfs_readpage(struct file *file, struct page *page)
{
	return mpage_readpage(page, hpfs_get_block);
}

static int hpfs_writepage(struct page *page, struct writeback_control *wbc)
{
	return block_write_full_page(page, hpfs_get_block, wbc);
}

static void hpfs_readahead(struct readahead_control *rac)
{
	mpage_readahead(rac, hpfs_get_block);
}

static int hpfs_writepages(struct address_space *mapping,
			   struct writeback_control *wbc)
{
	return mpage_writepages(mapping, wbc, hpfs_get_block);
}

static void hpfs_write_failed(struct address_space *mapping, loff_t to)
{
	struct inode *inode = mapping->host;

	hpfs_lock(inode->i_sb);

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

	hpfs_unlock(inode->i_sb);
}

static int hpfs_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,
				hpfs_get_block,
				&hpfs_i(mapping->host)->mmu_private);
	if (unlikely(ret))
		hpfs_write_failed(mapping, pos + len);

	return ret;
}

static int hpfs_write_end(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned copied,
			struct page *pagep, void *fsdata)
{
	struct inode *inode = mapping->host;
	int err;
	err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
	if (err < len)
		hpfs_write_failed(mapping, pos + len);
	if (!(err < 0)) {
		/* make sure we write it on close, if not earlier */
		hpfs_lock(inode->i_sb);
		hpfs_i(inode)->i_dirty = 1;
		hpfs_unlock(inode->i_sb);
	}
	return err;
}

static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
{
	return generic_block_bmap(mapping, block, hpfs_get_block);
}

static int hpfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, u64 start, u64 len)
{
	int ret;

	inode_lock(inode);
	len = min_t(u64, len, i_size_read(inode));
	ret = iomap_fiemap(inode, fieinfo, start, len, &hpfs_iomap_ops);
	inode_unlock(inode);

	return ret;
}

const struct address_space_operations hpfs_aops = {
	.set_page_dirty	= __set_page_dirty_buffers,
	.readpage = hpfs_readpage,
	.writepage = hpfs_writepage,
	.readahead = hpfs_readahead,
	.writepages = hpfs_writepages,
	.write_begin = hpfs_write_begin,
	.write_end = hpfs_write_end,
	.bmap = _hpfs_bmap
};

const struct file_operations hpfs_file_ops =
{
	.llseek		= generic_file_llseek,
	.read_iter	= generic_file_read_iter,
	.write_iter	= generic_file_write_iter,
	.mmap		= generic_file_mmap,
	.release	= hpfs_file_release,
	.fsync		= hpfs_file_fsync,
	.splice_read	= generic_file_splice_read,
	.unlocked_ioctl	= hpfs_ioctl,
	.compat_ioctl	= compat_ptr_ioctl,
};

const struct inode_operations hpfs_file_iops =
{
	.setattr	= hpfs_setattr,
	.fiemap		= hpfs_fiemap,
};
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* linux/fs/hpfs/file.c
	4	*
	5	* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
	6	*
	7	* file VFS functions
	8	*/
	9
	10	#include "hpfs_fn.h"
a0c1b759	11	#include <linux/mpage.h>
e0cba89d	12	#include <linux/iomap.h>
10c5db28	13	#include <linux/fiemap.h>
1da177e4 LT	14
	15	#define BLOCKS(size) (((size) + 511) >> 9)
	16
	17	static int hpfs_file_release(struct inode inode, struct file file)
	18	{
9a311b96	19	hpfs_lock(inode->i_sb);
1da177e4	20	hpfs_write_if_changed(inode);
9a311b96	21	hpfs_unlock(inode->i_sb);
1da177e4 LT	22	return 0;
	23	}
	24
02c24a82	25	int hpfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
1da177e4	26	{
bc8728ee	27	struct inode *inode = file->f_mapping->host;
02c24a82 JB	28	int ret;
02c24a82 JB	29
3b49c9a1	30	ret = file_write_and_wait_range(file, start, end);
02c24a82 JB	31	if (ret)
02c24a82 JB	32	return ret;
bc8728ee	33	return sync_blockdev(inode->i_sb->s_bdev);
1da177e4 LT	34	}
	35
	36	/*
	37	* generic_file_read often calls bmap with non-existing sector,
	38	* so we must ignore such errors.
	39	*/
	40
a0c1b759	41	static secno hpfs_bmap(struct inode inode, unsigned file_secno, unsigned n_secs)
1da177e4 LT	42	{
	43	struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
	44	unsigned n, disk_secno;
	45	struct fnode *fnode;
	46	struct buffer_head *bh;
	47	if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;
	48	n = file_secno - hpfs_inode->i_file_sec;
a0c1b759 MP	49	if (n < hpfs_inode->i_n_secs) {
	50	*n_secs = hpfs_inode->i_n_secs - n;
	51	return hpfs_inode->i_disk_sec + n;
	52	}
1da177e4 LT	53	if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
	54	disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
	55	if (disk_secno == -1) return 0;
	56	if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
a0c1b759 MP	57	n = file_secno - hpfs_inode->i_file_sec;
	58	if (n < hpfs_inode->i_n_secs) {
	59	*n_secs = hpfs_inode->i_n_secs - n;
	60	return hpfs_inode->i_disk_sec + n;
	61	}
	62	*n_secs = 1;
1da177e4 LT	63	return disk_secno;
	64	}
	65
70b31c4c	66	void hpfs_truncate(struct inode *i)
1da177e4 LT	67	{
1da177e4 LT	68	if (IS_IMMUTABLE(i)) return /-EPERM/;
7dd29d8d MP	69	hpfs_lock_assert(i->i_sb);
7dd29d8d MP	70
1da177e4 LT	71	hpfs_i(i)->i_n_secs = 0;
	72	i->i_blocks = 1 + ((i->i_size + 511) >> 9);
	73	hpfs_i(i)->mmu_private = i->i_size;
	74	hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
	75	hpfs_write_inode(i);
	76	hpfs_i(i)->i_n_secs = 0;
1da177e4 LT	77	}
	78
	79	static int hpfs_get_block(struct inode inode, sector_t iblock, struct buffer_head bh_result, int create)
	80	{
7dd29d8d	81	int r;
1da177e4	82	secno s;
a0c1b759	83	unsigned n_secs;
7dd29d8d	84	hpfs_lock(inode->i_sb);
a0c1b759	85	s = hpfs_bmap(inode, iblock, &n_secs);
1da177e4	86	if (s) {
a0c1b759 MP	87	if (bh_result->b_size >> 9 < n_secs)
a0c1b759 MP	88	n_secs = bh_result->b_size >> 9;
a64eefaa MP	89	n_secs = hpfs_search_hotfix_map_for_range(inode->i_sb, s, n_secs);
	90	if (unlikely(!n_secs)) {
	91	s = hpfs_search_hotfix_map(inode->i_sb, s);
	92	n_secs = 1;
	93	}
1da177e4	94	map_bh(bh_result, inode->i_sb, s);
a0c1b759	95	bh_result->b_size = n_secs << 9;
7dd29d8d	96	goto ret_0;
1da177e4	97	}
7dd29d8d	98	if (!create) goto ret_0;
1da177e4 LT	99	if (iblock<<9 != hpfs_i(inode)->mmu_private) {
1da177e4 LT	100	BUG();
7dd29d8d MP	101	r = -EIO;
7dd29d8d MP	102	goto ret_r;
1da177e4 LT	103	}
	104	if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
	105	hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
7dd29d8d MP	106	r = -ENOSPC;
7dd29d8d MP	107	goto ret_r;
1da177e4 LT	108	}
	109	inode->i_blocks++;
	110	hpfs_i(inode)->mmu_private += 512;
	111	set_buffer_new(bh_result);
a64eefaa	112	map_bh(bh_result, inode->i_sb, hpfs_search_hotfix_map(inode->i_sb, s));
7dd29d8d MP	113	ret_0:
	114	r = 0;
	115	ret_r:
	116	hpfs_unlock(inode->i_sb);
	117	return r;
1da177e4 LT	118	}
1da177e4 LT	119
e0cba89d CH	120	static int hpfs_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
	121	unsigned flags, struct iomap iomap, struct iomap srcmap)
	122	{
	123	struct super_block *sb = inode->i_sb;
	124	unsigned int blkbits = inode->i_blkbits;
	125	unsigned int n_secs;
	126	secno s;
	127
	128	if (WARN_ON_ONCE(flags & (IOMAP_WRITE \| IOMAP_ZERO)))
	129	return -EINVAL;
	130
	131	iomap->bdev = inode->i_sb->s_bdev;
	132	iomap->offset = offset;
	133
	134	hpfs_lock(sb);
	135	s = hpfs_bmap(inode, offset >> blkbits, &n_secs);
	136	if (s) {
	137	n_secs = hpfs_search_hotfix_map_for_range(sb, s,
	138	min_t(loff_t, n_secs, length));
	139	if (unlikely(!n_secs)) {
	140	s = hpfs_search_hotfix_map(sb, s);
	141	n_secs = 1;
	142	}
	143	iomap->type = IOMAP_MAPPED;
	144	iomap->flags = IOMAP_F_MERGED;
	145	iomap->addr = (u64)s << blkbits;
	146	iomap->length = (u64)n_secs << blkbits;
	147	} else {
	148	iomap->type = IOMAP_HOLE;
	149	iomap->addr = IOMAP_NULL_ADDR;
	150	iomap->length = 1 << blkbits;
	151	}
	152
	153	hpfs_unlock(sb);
	154	return 0;
	155	}
	156
	157	static const struct iomap_ops hpfs_iomap_ops = {
	158	.iomap_begin = hpfs_iomap_begin,
	159	};
	160
a0c1b759 MP	161	static int hpfs_readpage(struct file file, struct page page)
	162	{
	163	return mpage_readpage(page, hpfs_get_block);
	164	}
	165
1da177e4 LT	166	static int hpfs_writepage(struct page page, struct writeback_control wbc)
1da177e4 LT	167	{
a0c1b759	168	return block_write_full_page(page, hpfs_get_block, wbc);
1da177e4	169	}
d6091b72	170
d4388340	171	static void hpfs_readahead(struct readahead_control *rac)
a0c1b759	172	{
d4388340	173	mpage_readahead(rac, hpfs_get_block);
a0c1b759 MP	174	}
	175
	176	static int hpfs_writepages(struct address_space *mapping,
	177	struct writeback_control *wbc)
1da177e4	178	{
a0c1b759	179	return mpage_writepages(mapping, wbc, hpfs_get_block);
1da177e4	180	}
d6091b72	181
70b31c4c MS	182	static void hpfs_write_failed(struct address_space *mapping, loff_t to)
	183	{
	184	struct inode *inode = mapping->host;
	185
bbd465df MP	186	hpfs_lock(inode->i_sb);
bbd465df MP	187
70b31c4c	188	if (to > inode->i_size) {
7caef267	189	truncate_pagecache(inode, inode->i_size);
70b31c4c MS	190	hpfs_truncate(inode);
70b31c4c MS	191	}
bbd465df MP	192
bbd465df MP	193	hpfs_unlock(inode->i_sb);
70b31c4c MS	194	}
70b31c4c MS	195
d6091b72 NP	196	static int hpfs_write_begin(struct file file, struct address_space mapping,
	197	loff_t pos, unsigned len, unsigned flags,
	198	struct page pagep, void fsdata)
1da177e4	199	{
282dc178 CH	200	int ret;
282dc178 CH	201
d6091b72	202	*pagep = NULL;
282dc178	203	ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
d6091b72 NP	204	hpfs_get_block,
d6091b72 NP	205	&hpfs_i(mapping->host)->mmu_private);
70b31c4c MS	206	if (unlikely(ret))
70b31c4c MS	207	hpfs_write_failed(mapping, pos + len);
282dc178 CH	208
282dc178 CH	209	return ret;
1da177e4	210	}
d6091b72	211
5f2e354f AV	212	static int hpfs_write_end(struct file file, struct address_space mapping,
	213	loff_t pos, unsigned len, unsigned copied,
	214	struct page pagep, void fsdata)
	215	{
	216	struct inode *inode = mapping->host;
	217	int err;
	218	err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
	219	if (err < len)
	220	hpfs_write_failed(mapping, pos + len);
	221	if (!(err < 0)) {
	222	/* make sure we write it on close, if not earlier */
	223	hpfs_lock(inode->i_sb);
	224	hpfs_i(inode)->i_dirty = 1;
	225	hpfs_unlock(inode->i_sb);
	226	}
	227	return err;
	228	}
	229
1da177e4 LT	230	static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
1da177e4 LT	231	{
a64eefaa	232	return generic_block_bmap(mapping, block, hpfs_get_block);
1da177e4	233	}
d6091b72	234
91fff9b3 MP	235	static int hpfs_fiemap(struct inode inode, struct fiemap_extent_info fieinfo, u64 start, u64 len)
91fff9b3 MP	236	{
e0cba89d CH	237	int ret;
	238
	239	inode_lock(inode);
	240	len = min_t(u64, len, i_size_read(inode));
	241	ret = iomap_fiemap(inode, fieinfo, start, len, &hpfs_iomap_ops);
	242	inode_unlock(inode);
	243
	244	return ret;
91fff9b3 MP	245	}
91fff9b3 MP	246
f5e54d6e	247	const struct address_space_operations hpfs_aops = {
0af57378	248	.set_page_dirty = __set_page_dirty_buffers,
1da177e4 LT	249	.readpage = hpfs_readpage,
1da177e4 LT	250	.writepage = hpfs_writepage,
d4388340	251	.readahead = hpfs_readahead,
a0c1b759	252	.writepages = hpfs_writepages,
d6091b72	253	.write_begin = hpfs_write_begin,
5f2e354f	254	.write_end = hpfs_write_end,
1da177e4 LT	255	.bmap = _hpfs_bmap
	256	};
	257
4b6f5d20	258	const struct file_operations hpfs_file_ops =
1da177e4 LT	259	{
1da177e4 LT	260	.llseek = generic_file_llseek,
aad4f8bb	261	.read_iter = generic_file_read_iter,
8174202b	262	.write_iter = generic_file_write_iter,
1da177e4 LT	263	.mmap = generic_file_mmap,
	264	.release = hpfs_file_release,
	265	.fsync = hpfs_file_fsync,
5ffc4ef4	266	.splice_read = generic_file_splice_read,
a27b5b97	267	.unlocked_ioctl = hpfs_ioctl,
314999dc	268	.compat_ioctl = compat_ptr_ioctl,
1da177e4 LT	269	};
1da177e4 LT	270
92e1d5be	271	const struct inode_operations hpfs_file_iops =
1da177e4	272	{
ca30bc99	273	.setattr = hpfs_setattr,
91fff9b3	274	.fiemap = hpfs_fiemap,
1da177e4	275	};