fscache.c (3c265d7dcefab21a58ca5454c0f778412bde0870) fscache.c (ec00b5e29ce3a2493616a03b56593690574a8c86)
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2022, Alibaba Cloud
4 */
5#include <linux/fscache.h>
6#include "internal.h"
7
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2022, Alibaba Cloud
4 */
5#include <linux/fscache.h>
6#include "internal.h"
7
8/*
9 * Read data from fscache and fill the read data into page cache described by
10 * @start/len, which shall be both aligned with PAGE_SIZE. @pstart describes
11 * the start physical address in the cache file.
12 */
13static int erofs_fscache_read_folios(struct fscache_cookie *cookie,
14 struct address_space *mapping,
15 loff_t start, size_t len,
16 loff_t pstart)
17{
18 enum netfs_io_source source;
19 struct netfs_io_request rreq = {};
20 struct netfs_io_subrequest subreq = { .rreq = &rreq, };
21 struct netfs_cache_resources *cres = &rreq.cache_resources;
22 struct super_block *sb = mapping->host->i_sb;
23 struct iov_iter iter;
24 size_t done = 0;
25 int ret;
26
27 ret = fscache_begin_read_operation(cres, cookie);
28 if (ret)
29 return ret;
30
31 while (done < len) {
32 subreq.start = pstart + done;
33 subreq.len = len - done;
34 subreq.flags = 1 << NETFS_SREQ_ONDEMAND;
35
36 source = cres->ops->prepare_read(&subreq, LLONG_MAX);
37 if (WARN_ON(subreq.len == 0))
38 source = NETFS_INVALID_READ;
39 if (source != NETFS_READ_FROM_CACHE) {
40 erofs_err(sb, "failed to fscache prepare_read (source %d)",
41 source);
42 ret = -EIO;
43 goto out;
44 }
45
46 iov_iter_xarray(&iter, READ, &mapping->i_pages,
47 start + done, subreq.len);
48 ret = fscache_read(cres, subreq.start, &iter,
49 NETFS_READ_HOLE_FAIL, NULL, NULL);
50 if (ret) {
51 erofs_err(sb, "failed to fscache_read (ret %d)", ret);
52 goto out;
53 }
54
55 done += subreq.len;
56 }
57out:
58 fscache_end_operation(cres);
59 return ret;
60}
61
8static const struct address_space_operations erofs_fscache_meta_aops = {
9};
10
11int erofs_fscache_register_cookie(struct super_block *sb,
12 struct erofs_fscache **fscache,
13 char *name, bool need_inode)
14{
15 struct fscache_volume *volume = EROFS_SB(sb)->volume;

--- 96 unchanged lines hidden --- 		62static const struct address_space_operations erofs_fscache_meta_aops = {
63};
64
65int erofs_fscache_register_cookie(struct super_block *sb,
66 struct erofs_fscache **fscache,
67 char *name, bool need_inode)
68{
69 struct fscache_volume *volume = EROFS_SB(sb)->volume;

--- 96 unchanged lines hidden ---