1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2000-2001 Christoph Hellwig. 4 */ 5 6 /* 7 * Veritas filesystem driver - support for 'immed' inodes. 8 */ 9 #include <linux/fs.h> 10 #include <linux/pagemap.h> 11 12 #include "vxfs.h" 13 #include "vxfs_extern.h" 14 #include "vxfs_inode.h" 15 16 17 static int vxfs_immed_read_folio(struct file *, struct folio *); 18 19 /* 20 * Address space operations for immed files and directories. 21 */ 22 const struct address_space_operations vxfs_immed_aops = { 23 .read_folio = vxfs_immed_read_folio, 24 }; 25 26 /** 27 * vxfs_immed_read_folio - read part of an immed inode into pagecache 28 * @file: file context (unused) 29 * @folio: folio to fill in. 30 * 31 * Description: 32 * vxfs_immed_read_folio reads a part of the immed area of the 33 * file that hosts @pp into the pagecache. 34 * 35 * Returns: 36 * Zero on success, else a negative error code. 37 * 38 * Locking status: 39 * @folio is locked and will be unlocked. 40 */ 41 static int 42 vxfs_immed_read_folio(struct file *fp, struct folio *folio) 43 { 44 struct page *pp = &folio->page; 45 struct vxfs_inode_info *vip = VXFS_INO(pp->mapping->host); 46 u_int64_t offset = (u_int64_t)pp->index << PAGE_SHIFT; 47 caddr_t kaddr; 48 49 kaddr = kmap(pp); 50 memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_SIZE); 51 kunmap(pp); 52 53 flush_dcache_page(pp); 54 SetPageUptodate(pp); 55 unlock_page(pp); 56 57 return 0; 58 } 59