| 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 | * vxfs_immed_read_folio - read part of an immed inode into pagecache |
| 18 | * @file: file context (unused) |
| 19 | * @folio: folio to fill in. |
| 20 | * |
| 21 | * Description: |
| 22 | * vxfs_immed_read_folio reads a part of the immed area of the |
| 23 | * file that hosts @folio into the pagecache. |
| 24 | * |
| 25 | * Returns: |
| 26 | * Zero on success, else a negative error code. |
| 27 | * |
| 28 | * Locking status: |
| 29 | * @folio is locked and will be unlocked. |
| 30 | */ |
| 31 | static int vxfs_immed_read_folio(struct file *fp, struct folio *folio) |
| 32 | { |
| 33 | struct vxfs_inode_info *vip = VXFS_INO(inode: folio->mapping->host); |
| 34 | void *src = vip->vii_immed.vi_immed + folio_pos(folio); |
| 35 | unsigned long i; |
| 36 | |
| 37 | for (i = 0; i < folio_nr_pages(folio); i++) { |
| 38 | memcpy_to_page(folio_page(folio, i), offset: 0, from: src, PAGE_SIZE); |
| 39 | src += PAGE_SIZE; |
| 40 | } |
| 41 | |
| 42 | folio_mark_uptodate(folio); |
| 43 | folio_unlock(folio); |
| 44 | |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | /* |
| 49 | * Address space operations for immed files and directories. |
| 50 | */ |
| 51 | const struct address_space_operations vxfs_immed_aops = { |
| 52 | .read_folio = vxfs_immed_read_folio, |
| 53 | }; |
| 54 |