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36a43502e1
Reorganise the file to remove the forward declaration. Use folios throughout vxfs_immed_read_folio(). Use memcpy_to_page() instead of an open-coded kmap()/kunmap(). Remove flush_dcache_page() as this is embedded in memcpy_to_page(). Use folio_pos() instead of opencoding it. Handle multi-page folios. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2000-2001 Christoph Hellwig.
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*/
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/*
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* Veritas filesystem driver - support for 'immed' inodes.
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*/
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include "vxfs.h"
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#include "vxfs_extern.h"
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#include "vxfs_inode.h"
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/**
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* vxfs_immed_read_folio - read part of an immed inode into pagecache
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* @file: file context (unused)
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* @folio: folio to fill in.
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*
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* Description:
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* vxfs_immed_read_folio reads a part of the immed area of the
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* file that hosts @folio into the pagecache.
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*
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* Returns:
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* Zero on success, else a negative error code.
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*
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* Locking status:
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* @folio is locked and will be unlocked.
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*/
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static int vxfs_immed_read_folio(struct file *fp, struct folio *folio)
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{
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struct vxfs_inode_info *vip = VXFS_INO(folio->mapping->host);
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void *src = vip->vii_immed.vi_immed + folio_pos(folio);
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unsigned long i;
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for (i = 0; i < folio_nr_pages(folio); i++) {
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memcpy_to_page(folio_page(folio, i), 0, src, PAGE_SIZE);
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src += PAGE_SIZE;
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}
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folio_mark_uptodate(folio);
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folio_unlock(folio);
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return 0;
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}
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/*
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* Address space operations for immed files and directories.
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*/
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const struct address_space_operations vxfs_immed_aops = {
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.read_folio = vxfs_immed_read_folio,
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};
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