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fs/hpfs/file.c
5.71 KB
b24413180 License cleanup: ... |
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// SPDX-License-Identifier: GPL-2.0 |
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/* * linux/fs/hpfs/file.c * * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 * * file VFS functions */ #include "hpfs_fn.h" |
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#include <linux/mpage.h> |
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#include <linux/fiemap.h> |
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#define BLOCKS(size) (((size) + 511) >> 9) static int hpfs_file_release(struct inode *inode, struct file *file) { |
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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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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) return ret; |
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return sync_blockdev(inode->i_sb->s_bdev); |
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} /* * generic_file_read often calls bmap with non-existing sector, * so we must ignore such errors. */ |
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static secno hpfs_bmap(struct inode *inode, unsigned file_secno, unsigned *n_secs) |
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{ 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; |
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if (n < hpfs_inode->i_n_secs) { *n_secs = hpfs_inode->i_n_secs - n; return hpfs_inode->i_disk_sec + n; } |
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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; |
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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; |
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return disk_secno; } |
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void hpfs_truncate(struct inode *i) |
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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; 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; |
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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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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) 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); if (unlikely(!n_secs)) { s = hpfs_search_hotfix_map(inode->i_sb, s); n_secs = 1; } |
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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) { BUG(); |
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r = -EIO; goto ret_r; |
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} 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); |
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r = -ENOSPC; goto ret_r; |
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} inode->i_blocks++; hpfs_i(inode)->mmu_private += 512; 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: r = 0; ret_r: hpfs_unlock(inode->i_sb); return r; |
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} |
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static int hpfs_readpage(struct file *file, struct page *page) { return mpage_readpage(page, hpfs_get_block); } |
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static int hpfs_writepage(struct page *page, struct writeback_control *wbc) { |
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return block_write_full_page(page, hpfs_get_block, wbc); |
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} |
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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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} static int hpfs_writepages(struct address_space *mapping, 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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|
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static void hpfs_write_failed(struct address_space *mapping, loff_t to) { 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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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, loff_t pos, unsigned len, unsigned flags, 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, &hpfs_i(mapping->host)->mmu_private); |
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if (unlikely(ret)) hpfs_write_failed(mapping, pos + len); |
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return ret; |
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} |
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|
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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; } |
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static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block) { |
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return generic_block_bmap(mapping, block, hpfs_get_block); |
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} |
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|
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static int hpfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, u64 start, u64 len) { return generic_block_fiemap(inode, fieinfo, start, len, hpfs_get_block); } |
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const struct address_space_operations hpfs_aops = { |
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.readpage = hpfs_readpage, .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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const struct file_operations hpfs_file_ops = |
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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, .release = hpfs_file_release, .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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}; |