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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2016-2021 Christoph Hellwig.
4 */
5#include <linux/module.h>
6#include <linux/compiler.h>
7#include <linux/fs.h>
8#include <linux/iomap.h>
9#include <linux/fiemap.h>
10#include <linux/pagemap.h>
11
12static int iomap_to_fiemap(struct fiemap_extent_info *fi,
13 const struct iomap *iomap, u32 flags)
14{
15 switch (iomap->type) {
16 case IOMAP_HOLE:
17 /* skip holes */
18 return 0;
19 case IOMAP_DELALLOC:
20 flags |= FIEMAP_EXTENT_DELALLOC | FIEMAP_EXTENT_UNKNOWN;
21 break;
22 case IOMAP_MAPPED:
23 break;
24 case IOMAP_UNWRITTEN:
25 flags |= FIEMAP_EXTENT_UNWRITTEN;
26 break;
27 case IOMAP_INLINE:
28 flags |= FIEMAP_EXTENT_DATA_INLINE;
29 break;
30 }
31
32 if (iomap->flags & IOMAP_F_MERGED)
33 flags |= FIEMAP_EXTENT_MERGED;
34 if (iomap->flags & IOMAP_F_SHARED)
35 flags |= FIEMAP_EXTENT_SHARED;
36
37 return fiemap_fill_next_extent(fi, iomap->offset,
38 iomap->addr != IOMAP_NULL_ADDR ? iomap->addr : 0,
39 iomap->length, flags);
40}
41
42static loff_t iomap_fiemap_iter(const struct iomap_iter *iter,
43 struct fiemap_extent_info *fi, struct iomap *prev)
44{
45 int ret;
46
47 if (iter->iomap.type == IOMAP_HOLE)
48 return iomap_length(iter);
49
50 ret = iomap_to_fiemap(fi, prev, 0);
51 *prev = iter->iomap;
52 switch (ret) {
53 case 0: /* success */
54 return iomap_length(iter);
55 case 1: /* extent array full */
56 return 0;
57 default: /* error */
58 return ret;
59 }
60}
61
62int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fi,
63 u64 start, u64 len, const struct iomap_ops *ops)
64{
65 struct iomap_iter iter = {
66 .inode = inode,
67 .pos = start,
68 .len = len,
69 .flags = IOMAP_REPORT,
70 };
71 struct iomap prev = {
72 .type = IOMAP_HOLE,
73 };
74 int ret;
75
76 ret = fiemap_prep(inode, fi, start, &iter.len, 0);
77 if (ret)
78 return ret;
79
80 while ((ret = iomap_iter(&iter, ops)) > 0)
81 iter.processed = iomap_fiemap_iter(&iter, fi, &prev);
82
83 if (prev.type != IOMAP_HOLE) {
84 ret = iomap_to_fiemap(fi, &prev, FIEMAP_EXTENT_LAST);
85 if (ret < 0)
86 return ret;
87 }
88
89 /* inode with no (attribute) mapping will give ENOENT */
90 if (ret < 0 && ret != -ENOENT)
91 return ret;
92 return 0;
93}
94EXPORT_SYMBOL_GPL(iomap_fiemap);
95
96/* legacy ->bmap interface. 0 is the error return (!) */
97sector_t
98iomap_bmap(struct address_space *mapping, sector_t bno,
99 const struct iomap_ops *ops)
100{
101 struct iomap_iter iter = {
102 .inode = mapping->host,
103 .pos = (loff_t)bno << mapping->host->i_blkbits,
104 .len = i_blocksize(mapping->host),
105 .flags = IOMAP_REPORT,
106 };
107 const unsigned int blkshift = mapping->host->i_blkbits - SECTOR_SHIFT;
108 int ret;
109
110 if (filemap_write_and_wait(mapping))
111 return 0;
112
113 bno = 0;
114 while ((ret = iomap_iter(&iter, ops)) > 0) {
115 if (iter.iomap.type == IOMAP_MAPPED)
116 bno = iomap_sector(&iter.iomap, iter.pos) >> blkshift;
117 /* leave iter.processed unset to abort loop */
118 }
119 if (ret)
120 return 0;
121
122 return bno;
123}
124EXPORT_SYMBOL_GPL(iomap_bmap);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2016-2018 Christoph Hellwig.
4 */
5#include <linux/module.h>
6#include <linux/compiler.h>
7#include <linux/fs.h>
8#include <linux/iomap.h>
9#include <linux/fiemap.h>
10
11struct fiemap_ctx {
12 struct fiemap_extent_info *fi;
13 struct iomap prev;
14};
15
16static int iomap_to_fiemap(struct fiemap_extent_info *fi,
17 struct iomap *iomap, u32 flags)
18{
19 switch (iomap->type) {
20 case IOMAP_HOLE:
21 /* skip holes */
22 return 0;
23 case IOMAP_DELALLOC:
24 flags |= FIEMAP_EXTENT_DELALLOC | FIEMAP_EXTENT_UNKNOWN;
25 break;
26 case IOMAP_MAPPED:
27 break;
28 case IOMAP_UNWRITTEN:
29 flags |= FIEMAP_EXTENT_UNWRITTEN;
30 break;
31 case IOMAP_INLINE:
32 flags |= FIEMAP_EXTENT_DATA_INLINE;
33 break;
34 }
35
36 if (iomap->flags & IOMAP_F_MERGED)
37 flags |= FIEMAP_EXTENT_MERGED;
38 if (iomap->flags & IOMAP_F_SHARED)
39 flags |= FIEMAP_EXTENT_SHARED;
40
41 return fiemap_fill_next_extent(fi, iomap->offset,
42 iomap->addr != IOMAP_NULL_ADDR ? iomap->addr : 0,
43 iomap->length, flags);
44}
45
46static loff_t
47iomap_fiemap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
48 struct iomap *iomap, struct iomap *srcmap)
49{
50 struct fiemap_ctx *ctx = data;
51 loff_t ret = length;
52
53 if (iomap->type == IOMAP_HOLE)
54 return length;
55
56 ret = iomap_to_fiemap(ctx->fi, &ctx->prev, 0);
57 ctx->prev = *iomap;
58 switch (ret) {
59 case 0: /* success */
60 return length;
61 case 1: /* extent array full */
62 return 0;
63 default:
64 return ret;
65 }
66}
67
68int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fi,
69 u64 start, u64 len, const struct iomap_ops *ops)
70{
71 struct fiemap_ctx ctx;
72 loff_t ret;
73
74 memset(&ctx, 0, sizeof(ctx));
75 ctx.fi = fi;
76 ctx.prev.type = IOMAP_HOLE;
77
78 ret = fiemap_prep(inode, fi, start, &len, 0);
79 if (ret)
80 return ret;
81
82 while (len > 0) {
83 ret = iomap_apply(inode, start, len, IOMAP_REPORT, ops, &ctx,
84 iomap_fiemap_actor);
85 /* inode with no (attribute) mapping will give ENOENT */
86 if (ret == -ENOENT)
87 break;
88 if (ret < 0)
89 return ret;
90 if (ret == 0)
91 break;
92
93 start += ret;
94 len -= ret;
95 }
96
97 if (ctx.prev.type != IOMAP_HOLE) {
98 ret = iomap_to_fiemap(fi, &ctx.prev, FIEMAP_EXTENT_LAST);
99 if (ret < 0)
100 return ret;
101 }
102
103 return 0;
104}
105EXPORT_SYMBOL_GPL(iomap_fiemap);
106
107static loff_t
108iomap_bmap_actor(struct inode *inode, loff_t pos, loff_t length,
109 void *data, struct iomap *iomap, struct iomap *srcmap)
110{
111 sector_t *bno = data, addr;
112
113 if (iomap->type == IOMAP_MAPPED) {
114 addr = (pos - iomap->offset + iomap->addr) >> inode->i_blkbits;
115 *bno = addr;
116 }
117 return 0;
118}
119
120/* legacy ->bmap interface. 0 is the error return (!) */
121sector_t
122iomap_bmap(struct address_space *mapping, sector_t bno,
123 const struct iomap_ops *ops)
124{
125 struct inode *inode = mapping->host;
126 loff_t pos = bno << inode->i_blkbits;
127 unsigned blocksize = i_blocksize(inode);
128 int ret;
129
130 if (filemap_write_and_wait(mapping))
131 return 0;
132
133 bno = 0;
134 ret = iomap_apply(inode, pos, blocksize, 0, ops, &bno,
135 iomap_bmap_actor);
136 if (ret)
137 return 0;
138 return bno;
139}
140EXPORT_SYMBOL_GPL(iomap_bmap);