1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (c) 2016-2018 Christoph Hellwig.
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun #include <linux/module.h>
6*4882a593Smuzhiyun #include <linux/compiler.h>
7*4882a593Smuzhiyun #include <linux/fs.h>
8*4882a593Smuzhiyun #include <linux/iomap.h>
9*4882a593Smuzhiyun #include <linux/fiemap.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun struct fiemap_ctx {
12*4882a593Smuzhiyun struct fiemap_extent_info *fi;
13*4882a593Smuzhiyun struct iomap prev;
14*4882a593Smuzhiyun };
15*4882a593Smuzhiyun
iomap_to_fiemap(struct fiemap_extent_info * fi,struct iomap * iomap,u32 flags)16*4882a593Smuzhiyun static int iomap_to_fiemap(struct fiemap_extent_info *fi,
17*4882a593Smuzhiyun struct iomap *iomap, u32 flags)
18*4882a593Smuzhiyun {
19*4882a593Smuzhiyun switch (iomap->type) {
20*4882a593Smuzhiyun case IOMAP_HOLE:
21*4882a593Smuzhiyun /* skip holes */
22*4882a593Smuzhiyun return 0;
23*4882a593Smuzhiyun case IOMAP_DELALLOC:
24*4882a593Smuzhiyun flags |= FIEMAP_EXTENT_DELALLOC | FIEMAP_EXTENT_UNKNOWN;
25*4882a593Smuzhiyun break;
26*4882a593Smuzhiyun case IOMAP_MAPPED:
27*4882a593Smuzhiyun break;
28*4882a593Smuzhiyun case IOMAP_UNWRITTEN:
29*4882a593Smuzhiyun flags |= FIEMAP_EXTENT_UNWRITTEN;
30*4882a593Smuzhiyun break;
31*4882a593Smuzhiyun case IOMAP_INLINE:
32*4882a593Smuzhiyun flags |= FIEMAP_EXTENT_DATA_INLINE;
33*4882a593Smuzhiyun break;
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun if (iomap->flags & IOMAP_F_MERGED)
37*4882a593Smuzhiyun flags |= FIEMAP_EXTENT_MERGED;
38*4882a593Smuzhiyun if (iomap->flags & IOMAP_F_SHARED)
39*4882a593Smuzhiyun flags |= FIEMAP_EXTENT_SHARED;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun return fiemap_fill_next_extent(fi, iomap->offset,
42*4882a593Smuzhiyun iomap->addr != IOMAP_NULL_ADDR ? iomap->addr : 0,
43*4882a593Smuzhiyun iomap->length, flags);
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun static loff_t
iomap_fiemap_actor(struct inode * inode,loff_t pos,loff_t length,void * data,struct iomap * iomap,struct iomap * srcmap)47*4882a593Smuzhiyun iomap_fiemap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
48*4882a593Smuzhiyun struct iomap *iomap, struct iomap *srcmap)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun struct fiemap_ctx *ctx = data;
51*4882a593Smuzhiyun loff_t ret = length;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun if (iomap->type == IOMAP_HOLE)
54*4882a593Smuzhiyun return length;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun ret = iomap_to_fiemap(ctx->fi, &ctx->prev, 0);
57*4882a593Smuzhiyun ctx->prev = *iomap;
58*4882a593Smuzhiyun switch (ret) {
59*4882a593Smuzhiyun case 0: /* success */
60*4882a593Smuzhiyun return length;
61*4882a593Smuzhiyun case 1: /* extent array full */
62*4882a593Smuzhiyun return 0;
63*4882a593Smuzhiyun default:
64*4882a593Smuzhiyun return ret;
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
iomap_fiemap(struct inode * inode,struct fiemap_extent_info * fi,u64 start,u64 len,const struct iomap_ops * ops)68*4882a593Smuzhiyun int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fi,
69*4882a593Smuzhiyun u64 start, u64 len, const struct iomap_ops *ops)
70*4882a593Smuzhiyun {
71*4882a593Smuzhiyun struct fiemap_ctx ctx;
72*4882a593Smuzhiyun loff_t ret;
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun memset(&ctx, 0, sizeof(ctx));
75*4882a593Smuzhiyun ctx.fi = fi;
76*4882a593Smuzhiyun ctx.prev.type = IOMAP_HOLE;
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun ret = fiemap_prep(inode, fi, start, &len, 0);
79*4882a593Smuzhiyun if (ret)
80*4882a593Smuzhiyun return ret;
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun while (len > 0) {
83*4882a593Smuzhiyun ret = iomap_apply(inode, start, len, IOMAP_REPORT, ops, &ctx,
84*4882a593Smuzhiyun iomap_fiemap_actor);
85*4882a593Smuzhiyun /* inode with no (attribute) mapping will give ENOENT */
86*4882a593Smuzhiyun if (ret == -ENOENT)
87*4882a593Smuzhiyun break;
88*4882a593Smuzhiyun if (ret < 0)
89*4882a593Smuzhiyun return ret;
90*4882a593Smuzhiyun if (ret == 0)
91*4882a593Smuzhiyun break;
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun start += ret;
94*4882a593Smuzhiyun len -= ret;
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun if (ctx.prev.type != IOMAP_HOLE) {
98*4882a593Smuzhiyun ret = iomap_to_fiemap(fi, &ctx.prev, FIEMAP_EXTENT_LAST);
99*4882a593Smuzhiyun if (ret < 0)
100*4882a593Smuzhiyun return ret;
101*4882a593Smuzhiyun }
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun return 0;
104*4882a593Smuzhiyun }
105*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(iomap_fiemap);
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun static loff_t
iomap_bmap_actor(struct inode * inode,loff_t pos,loff_t length,void * data,struct iomap * iomap,struct iomap * srcmap)108*4882a593Smuzhiyun iomap_bmap_actor(struct inode *inode, loff_t pos, loff_t length,
109*4882a593Smuzhiyun void *data, struct iomap *iomap, struct iomap *srcmap)
110*4882a593Smuzhiyun {
111*4882a593Smuzhiyun sector_t *bno = data, addr;
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun if (iomap->type == IOMAP_MAPPED) {
114*4882a593Smuzhiyun addr = (pos - iomap->offset + iomap->addr) >> inode->i_blkbits;
115*4882a593Smuzhiyun *bno = addr;
116*4882a593Smuzhiyun }
117*4882a593Smuzhiyun return 0;
118*4882a593Smuzhiyun }
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun /* legacy ->bmap interface. 0 is the error return (!) */
121*4882a593Smuzhiyun sector_t
iomap_bmap(struct address_space * mapping,sector_t bno,const struct iomap_ops * ops)122*4882a593Smuzhiyun iomap_bmap(struct address_space *mapping, sector_t bno,
123*4882a593Smuzhiyun const struct iomap_ops *ops)
124*4882a593Smuzhiyun {
125*4882a593Smuzhiyun struct inode *inode = mapping->host;
126*4882a593Smuzhiyun loff_t pos = bno << inode->i_blkbits;
127*4882a593Smuzhiyun unsigned blocksize = i_blocksize(inode);
128*4882a593Smuzhiyun int ret;
129*4882a593Smuzhiyun
130*4882a593Smuzhiyun if (filemap_write_and_wait(mapping))
131*4882a593Smuzhiyun return 0;
132*4882a593Smuzhiyun
133*4882a593Smuzhiyun bno = 0;
134*4882a593Smuzhiyun ret = iomap_apply(inode, pos, blocksize, 0, ops, &bno,
135*4882a593Smuzhiyun iomap_bmap_actor);
136*4882a593Smuzhiyun if (ret)
137*4882a593Smuzhiyun return 0;
138*4882a593Smuzhiyun return bno;
139*4882a593Smuzhiyun }
140*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(iomap_bmap);
141