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275 lines
6.9 KiB
275 lines
6.9 KiB
// 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 ([email protected]), 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_readpage(struct file *file, struct page *page) |
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{ |
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return mpage_readpage(page, hpfs_get_block); |
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} |
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static int hpfs_writepage(struct page *page, struct writeback_control *wbc) |
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{ |
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return block_write_full_page(page, hpfs_get_block, wbc); |
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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, unsigned flags, |
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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, flags, 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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.set_page_dirty = __set_page_dirty_buffers, |
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.readpage = hpfs_readpage, |
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.writepage = hpfs_writepage, |
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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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}; |
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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 = generic_file_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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