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0b1e987c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Copyright (c) 2000-2001 Christoph Hellwig. | |
1da177e4 LT |
4 | */ |
5 | ||
6 | /* | |
7 | * Veritas filesystem driver - shared subroutines. | |
8 | */ | |
9 | #include <linux/fs.h> | |
10 | #include <linux/buffer_head.h> | |
11 | #include <linux/kernel.h> | |
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12 | #include <linux/pagemap.h> |
13 | ||
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14 | #include "vxfs_extern.h" |
15 | ||
16 | ||
2c69e205 | 17 | static int vxfs_read_folio(struct file *, struct folio *); |
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18 | static sector_t vxfs_bmap(struct address_space *, sector_t); |
19 | ||
f5e54d6e | 20 | const struct address_space_operations vxfs_aops = { |
2c69e205 | 21 | .read_folio = vxfs_read_folio, |
1da177e4 | 22 | .bmap = vxfs_bmap, |
1da177e4 LT |
23 | }; |
24 | ||
25 | inline void | |
26 | vxfs_put_page(struct page *pp) | |
27 | { | |
28 | kunmap(pp); | |
09cbfeaf | 29 | put_page(pp); |
1da177e4 LT |
30 | } |
31 | ||
32 | /** | |
33 | * vxfs_get_page - read a page into memory. | |
d3fcf834 | 34 | * @mapping: mapping to read from |
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35 | * @n: page number |
36 | * | |
37 | * Description: | |
38 | * vxfs_get_page reads the @n th page of @ip into the pagecache. | |
39 | * | |
40 | * Returns: | |
41 | * The wanted page on success, else a NULL pointer. | |
42 | */ | |
43 | struct page * | |
44 | vxfs_get_page(struct address_space *mapping, u_long n) | |
45 | { | |
46 | struct page * pp; | |
47 | ||
090d2b18 | 48 | pp = read_mapping_page(mapping, n, NULL); |
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49 | |
50 | if (!IS_ERR(pp)) { | |
1da177e4 | 51 | kmap(pp); |
1da177e4 LT |
52 | /** if (!PageChecked(pp)) **/ |
53 | /** vxfs_check_page(pp); **/ | |
1da177e4 LT |
54 | } |
55 | ||
56 | return (pp); | |
1da177e4 LT |
57 | } |
58 | ||
59 | /** | |
60 | * vxfs_bread - read buffer for a give inode,block tuple | |
61 | * @ip: inode | |
62 | * @block: logical block | |
63 | * | |
64 | * Description: | |
65 | * The vxfs_bread function reads block no @block of | |
66 | * @ip into the buffercache. | |
67 | * | |
68 | * Returns: | |
69 | * The resulting &struct buffer_head. | |
70 | */ | |
71 | struct buffer_head * | |
72 | vxfs_bread(struct inode *ip, int block) | |
73 | { | |
74 | struct buffer_head *bp; | |
75 | daddr_t pblock; | |
76 | ||
77 | pblock = vxfs_bmap1(ip, block); | |
78 | bp = sb_bread(ip->i_sb, pblock); | |
79 | ||
80 | return (bp); | |
81 | } | |
82 | ||
83 | /** | |
d3fcf834 | 84 | * vxfs_getblk - locate buffer for given inode,block tuple |
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85 | * @ip: inode |
86 | * @iblock: logical block | |
87 | * @bp: buffer skeleton | |
88 | * @create: %TRUE if blocks may be newly allocated. | |
89 | * | |
90 | * Description: | |
d3fcf834 | 91 | * The vxfs_getblk function fills @bp with the right physical |
1da177e4 LT |
92 | * block and device number to perform a lowlevel read/write on |
93 | * it. | |
94 | * | |
95 | * Returns: | |
96 | * Zero on success, else a negativ error code (-EIO). | |
97 | */ | |
98 | static int | |
99 | vxfs_getblk(struct inode *ip, sector_t iblock, | |
100 | struct buffer_head *bp, int create) | |
101 | { | |
102 | daddr_t pblock; | |
103 | ||
104 | pblock = vxfs_bmap1(ip, iblock); | |
105 | if (pblock != 0) { | |
106 | map_bh(bp, ip->i_sb, pblock); | |
107 | return 0; | |
108 | } | |
109 | ||
110 | return -EIO; | |
111 | } | |
112 | ||
113 | /** | |
2c69e205 | 114 | * vxfs_read_folio - read one page synchronously into the pagecache |
1da177e4 | 115 | * @file: file context (unused) |
2c69e205 | 116 | * @folio: folio to fill in. |
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117 | * |
118 | * Description: | |
2c69e205 | 119 | * The vxfs_read_folio routine reads @folio synchronously into the |
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120 | * pagecache. |
121 | * | |
122 | * Returns: | |
123 | * Zero on success, else a negative error code. | |
124 | * | |
125 | * Locking status: | |
2c69e205 | 126 | * @folio is locked and will be unlocked. |
1da177e4 | 127 | */ |
2c69e205 | 128 | static int vxfs_read_folio(struct file *file, struct folio *folio) |
1da177e4 | 129 | { |
2c69e205 | 130 | return block_read_full_folio(folio, vxfs_getblk); |
1da177e4 LT |
131 | } |
132 | ||
133 | /** | |
134 | * vxfs_bmap - perform logical to physical block mapping | |
135 | * @mapping: logical to physical mapping to use | |
136 | * @block: logical block (relative to @mapping). | |
137 | * | |
138 | * Description: | |
139 | * Vxfs_bmap find out the corresponding phsical block to the | |
140 | * @mapping, @block pair. | |
141 | * | |
142 | * Returns: | |
143 | * Physical block number on success, else Zero. | |
144 | * | |
145 | * Locking status: | |
146 | * We are under the bkl. | |
147 | */ | |
148 | static sector_t | |
149 | vxfs_bmap(struct address_space *mapping, sector_t block) | |
150 | { | |
151 | return generic_block_bmap(mapping, block, vxfs_getblk); | |
152 | } |