272 lines
6.8 KiB
C
272 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/hpfs/file.c
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*
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* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
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*
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* file VFS functions
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*/
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#include "hpfs_fn.h"
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#include <linux/mpage.h>
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#include <linux/iomap.h>
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#include <linux/fiemap.h>
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#define BLOCKS(size) (((size) + 511) >> 9)
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static int hpfs_file_release(struct inode *inode, struct file *file)
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{
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hpfs_lock(inode->i_sb);
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hpfs_write_if_changed(inode);
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hpfs_unlock(inode->i_sb);
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return 0;
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}
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int hpfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
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{
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struct inode *inode = file->f_mapping->host;
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int ret;
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ret = file_write_and_wait_range(file, start, end);
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if (ret)
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return ret;
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return sync_blockdev(inode->i_sb->s_bdev);
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}
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/*
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* generic_file_read often calls bmap with non-existing sector,
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* so we must ignore such errors.
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*/
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static secno hpfs_bmap(struct inode *inode, unsigned file_secno, unsigned *n_secs)
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{
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struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
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unsigned n, disk_secno;
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struct fnode *fnode;
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struct buffer_head *bh;
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if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;
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n = file_secno - hpfs_inode->i_file_sec;
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if (n < hpfs_inode->i_n_secs) {
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*n_secs = hpfs_inode->i_n_secs - n;
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return hpfs_inode->i_disk_sec + n;
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}
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if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
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disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
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if (disk_secno == -1) return 0;
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if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
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n = file_secno - hpfs_inode->i_file_sec;
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if (n < hpfs_inode->i_n_secs) {
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*n_secs = hpfs_inode->i_n_secs - n;
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return hpfs_inode->i_disk_sec + n;
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}
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*n_secs = 1;
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return disk_secno;
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}
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void hpfs_truncate(struct inode *i)
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{
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if (IS_IMMUTABLE(i)) return /*-EPERM*/;
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hpfs_lock_assert(i->i_sb);
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hpfs_i(i)->i_n_secs = 0;
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i->i_blocks = 1 + ((i->i_size + 511) >> 9);
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hpfs_i(i)->mmu_private = i->i_size;
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hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
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hpfs_write_inode(i);
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hpfs_i(i)->i_n_secs = 0;
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}
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static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
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{
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int r;
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secno s;
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unsigned n_secs;
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hpfs_lock(inode->i_sb);
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s = hpfs_bmap(inode, iblock, &n_secs);
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if (s) {
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if (bh_result->b_size >> 9 < n_secs)
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n_secs = bh_result->b_size >> 9;
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n_secs = hpfs_search_hotfix_map_for_range(inode->i_sb, s, n_secs);
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if (unlikely(!n_secs)) {
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s = hpfs_search_hotfix_map(inode->i_sb, s);
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n_secs = 1;
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}
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map_bh(bh_result, inode->i_sb, s);
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bh_result->b_size = n_secs << 9;
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goto ret_0;
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}
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if (!create) goto ret_0;
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if (iblock<<9 != hpfs_i(inode)->mmu_private) {
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BUG();
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r = -EIO;
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goto ret_r;
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}
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if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
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hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
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r = -ENOSPC;
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goto ret_r;
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}
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inode->i_blocks++;
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hpfs_i(inode)->mmu_private += 512;
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set_buffer_new(bh_result);
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map_bh(bh_result, inode->i_sb, hpfs_search_hotfix_map(inode->i_sb, s));
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ret_0:
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r = 0;
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ret_r:
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hpfs_unlock(inode->i_sb);
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return r;
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}
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static int hpfs_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
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unsigned flags, struct iomap *iomap, struct iomap *srcmap)
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{
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struct super_block *sb = inode->i_sb;
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unsigned int blkbits = inode->i_blkbits;
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unsigned int n_secs;
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secno s;
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if (WARN_ON_ONCE(flags & (IOMAP_WRITE | IOMAP_ZERO)))
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return -EINVAL;
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iomap->bdev = inode->i_sb->s_bdev;
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iomap->offset = offset;
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hpfs_lock(sb);
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s = hpfs_bmap(inode, offset >> blkbits, &n_secs);
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if (s) {
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n_secs = hpfs_search_hotfix_map_for_range(sb, s,
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min_t(loff_t, n_secs, length));
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if (unlikely(!n_secs)) {
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s = hpfs_search_hotfix_map(sb, s);
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n_secs = 1;
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}
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iomap->type = IOMAP_MAPPED;
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iomap->flags = IOMAP_F_MERGED;
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iomap->addr = (u64)s << blkbits;
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iomap->length = (u64)n_secs << blkbits;
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} else {
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iomap->type = IOMAP_HOLE;
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iomap->addr = IOMAP_NULL_ADDR;
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iomap->length = 1 << blkbits;
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}
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hpfs_unlock(sb);
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return 0;
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}
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static const struct iomap_ops hpfs_iomap_ops = {
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.iomap_begin = hpfs_iomap_begin,
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};
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static int hpfs_read_folio(struct file *file, struct folio *folio)
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{
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return mpage_read_folio(folio, hpfs_get_block);
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}
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static void hpfs_readahead(struct readahead_control *rac)
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{
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mpage_readahead(rac, hpfs_get_block);
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}
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static int hpfs_writepages(struct address_space *mapping,
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struct writeback_control *wbc)
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{
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return mpage_writepages(mapping, wbc, hpfs_get_block);
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}
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static void hpfs_write_failed(struct address_space *mapping, loff_t to)
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{
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struct inode *inode = mapping->host;
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hpfs_lock(inode->i_sb);
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if (to > inode->i_size) {
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truncate_pagecache(inode, inode->i_size);
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hpfs_truncate(inode);
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}
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hpfs_unlock(inode->i_sb);
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}
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static int hpfs_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len,
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struct page **pagep, void **fsdata)
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{
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int ret;
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*pagep = NULL;
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ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
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hpfs_get_block,
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&hpfs_i(mapping->host)->mmu_private);
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if (unlikely(ret))
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hpfs_write_failed(mapping, pos + len);
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return ret;
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}
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static int hpfs_write_end(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned copied,
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struct page *pagep, void *fsdata)
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{
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struct inode *inode = mapping->host;
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int err;
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err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
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if (err < len)
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hpfs_write_failed(mapping, pos + len);
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if (!(err < 0)) {
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/* make sure we write it on close, if not earlier */
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hpfs_lock(inode->i_sb);
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hpfs_i(inode)->i_dirty = 1;
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hpfs_unlock(inode->i_sb);
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}
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return err;
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}
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static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
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{
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return generic_block_bmap(mapping, block, hpfs_get_block);
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}
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static int hpfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, u64 start, u64 len)
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{
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int ret;
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inode_lock(inode);
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len = min_t(u64, len, i_size_read(inode));
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ret = iomap_fiemap(inode, fieinfo, start, len, &hpfs_iomap_ops);
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inode_unlock(inode);
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return ret;
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}
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const struct address_space_operations hpfs_aops = {
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.dirty_folio = block_dirty_folio,
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.invalidate_folio = block_invalidate_folio,
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.read_folio = hpfs_read_folio,
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.readahead = hpfs_readahead,
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.writepages = hpfs_writepages,
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.write_begin = hpfs_write_begin,
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.write_end = hpfs_write_end,
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.bmap = _hpfs_bmap,
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.migrate_folio = buffer_migrate_folio,
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};
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const struct file_operations hpfs_file_ops =
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{
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.llseek = generic_file_llseek,
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.read_iter = generic_file_read_iter,
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.write_iter = generic_file_write_iter,
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.mmap = generic_file_mmap,
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.release = hpfs_file_release,
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.fsync = hpfs_file_fsync,
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.splice_read = filemap_splice_read,
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.unlocked_ioctl = hpfs_ioctl,
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.compat_ioctl = compat_ptr_ioctl,
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};
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const struct inode_operations hpfs_file_iops =
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{
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.setattr = hpfs_setattr,
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.fiemap = hpfs_fiemap,
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};
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