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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
10struct fiemap_ctx {
11 struct fiemap_extent_info *fi;
12 struct iomap prev;
13};
14
15static int iomap_to_fiemap(struct fiemap_extent_info *fi,
16 struct iomap *iomap, u32 flags)
17{
18 switch (iomap->type) {
19 case IOMAP_HOLE:
20 /* skip holes */
21 return 0;
22 case IOMAP_DELALLOC:
23 flags |= FIEMAP_EXTENT_DELALLOC | FIEMAP_EXTENT_UNKNOWN;
24 break;
25 case IOMAP_MAPPED:
26 break;
27 case IOMAP_UNWRITTEN:
28 flags |= FIEMAP_EXTENT_UNWRITTEN;
29 break;
30 case IOMAP_INLINE:
31 flags |= FIEMAP_EXTENT_DATA_INLINE;
32 break;
33 }
34
35 if (iomap->flags & IOMAP_F_MERGED)
36 flags |= FIEMAP_EXTENT_MERGED;
37 if (iomap->flags & IOMAP_F_SHARED)
38 flags |= FIEMAP_EXTENT_SHARED;
39
40 return fiemap_fill_next_extent(fi, iomap->offset,
41 iomap->addr != IOMAP_NULL_ADDR ? iomap->addr : 0,
42 iomap->length, flags);
43}
44
45static loff_t
46iomap_fiemap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
47 struct iomap *iomap)
48{
49 struct fiemap_ctx *ctx = data;
50 loff_t ret = length;
51
52 if (iomap->type == IOMAP_HOLE)
53 return length;
54
55 ret = iomap_to_fiemap(ctx->fi, &ctx->prev, 0);
56 ctx->prev = *iomap;
57 switch (ret) {
58 case 0: /* success */
59 return length;
60 case 1: /* extent array full */
61 return 0;
62 default:
63 return ret;
64 }
65}
66
67int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fi,
68 loff_t start, loff_t len, const struct iomap_ops *ops)
69{
70 struct fiemap_ctx ctx;
71 loff_t ret;
72
73 memset(&ctx, 0, sizeof(ctx));
74 ctx.fi = fi;
75 ctx.prev.type = IOMAP_HOLE;
76
77 ret = fiemap_check_flags(fi, FIEMAP_FLAG_SYNC);
78 if (ret)
79 return ret;
80
81 if (fi->fi_flags & FIEMAP_FLAG_SYNC) {
82 ret = filemap_write_and_wait(inode->i_mapping);
83 if (ret)
84 return ret;
85 }
86
87 while (len > 0) {
88 ret = iomap_apply(inode, start, len, IOMAP_REPORT, ops, &ctx,
89 iomap_fiemap_actor);
90 /* inode with no (attribute) mapping will give ENOENT */
91 if (ret == -ENOENT)
92 break;
93 if (ret < 0)
94 return ret;
95 if (ret == 0)
96 break;
97
98 start += ret;
99 len -= ret;
100 }
101
102 if (ctx.prev.type != IOMAP_HOLE) {
103 ret = iomap_to_fiemap(fi, &ctx.prev, FIEMAP_EXTENT_LAST);
104 if (ret < 0)
105 return ret;
106 }
107
108 return 0;
109}
110EXPORT_SYMBOL_GPL(iomap_fiemap);
111
112static loff_t
113iomap_bmap_actor(struct inode *inode, loff_t pos, loff_t length,
114 void *data, struct iomap *iomap)
115{
116 sector_t *bno = data, addr;
117
118 if (iomap->type == IOMAP_MAPPED) {
119 addr = (pos - iomap->offset + iomap->addr) >> inode->i_blkbits;
120 if (addr > INT_MAX)
121 WARN(1, "would truncate bmap result\n");
122 else
123 *bno = addr;
124 }
125 return 0;
126}
127
128/* legacy ->bmap interface. 0 is the error return (!) */
129sector_t
130iomap_bmap(struct address_space *mapping, sector_t bno,
131 const struct iomap_ops *ops)
132{
133 struct inode *inode = mapping->host;
134 loff_t pos = bno << inode->i_blkbits;
135 unsigned blocksize = i_blocksize(inode);
136
137 if (filemap_write_and_wait(mapping))
138 return 0;
139
140 bno = 0;
141 iomap_apply(inode, pos, blocksize, 0, ops, &bno, iomap_bmap_actor);
142 return bno;
143}
144EXPORT_SYMBOL_GPL(iomap_bmap);