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1/*
2 * Copyright (c) 2014 Christoph Hellwig.
3 */
4#include <linux/exportfs.h>
5#include <linux/genhd.h>
6#include <linux/slab.h>
7
8#include <linux/nfsd/debug.h>
9
10#include "blocklayoutxdr.h"
11#include "pnfs.h"
12
13#define NFSDDBG_FACILITY NFSDDBG_PNFS
14
15
16static int
17nfsd4_block_get_device_info_simple(struct super_block *sb,
18 struct nfsd4_getdeviceinfo *gdp)
19{
20 struct pnfs_block_deviceaddr *dev;
21 struct pnfs_block_volume *b;
22
23 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
24 sizeof(struct pnfs_block_volume), GFP_KERNEL);
25 if (!dev)
26 return -ENOMEM;
27 gdp->gd_device = dev;
28
29 dev->nr_volumes = 1;
30 b = &dev->volumes[0];
31
32 b->type = PNFS_BLOCK_VOLUME_SIMPLE;
33 b->simple.sig_len = PNFS_BLOCK_UUID_LEN;
34 return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len,
35 &b->simple.offset);
36}
37
38static __be32
39nfsd4_block_proc_getdeviceinfo(struct super_block *sb,
40 struct nfsd4_getdeviceinfo *gdp)
41{
42 if (sb->s_bdev != sb->s_bdev->bd_contains)
43 return nfserr_inval;
44 return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp));
45}
46
47static __be32
48nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
49 struct nfsd4_layoutget *args)
50{
51 struct nfsd4_layout_seg *seg = &args->lg_seg;
52 struct super_block *sb = inode->i_sb;
53 u32 block_size = (1 << inode->i_blkbits);
54 struct pnfs_block_extent *bex;
55 struct iomap iomap;
56 u32 device_generation = 0;
57 int error;
58
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59 if (seg->offset & (block_size - 1)) {
60 dprintk("pnfsd: I/O misaligned\n");
61 goto out_layoutunavailable;
62 }
63
64 /*
65 * Some clients barf on non-zero block numbers for NONE or INVALID
66 * layouts, so make sure to zero the whole structure.
67 */
68 error = -ENOMEM;
69 bex = kzalloc(sizeof(*bex), GFP_KERNEL);
70 if (!bex)
71 goto out_error;
72 args->lg_content = bex;
73
74 error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length,
75 &iomap, seg->iomode != IOMODE_READ,
76 &device_generation);
77 if (error) {
78 if (error == -ENXIO)
79 goto out_layoutunavailable;
80 goto out_error;
81 }
82
83 if (iomap.length < args->lg_minlength) {
84 dprintk("pnfsd: extent smaller than minlength\n");
85 goto out_layoutunavailable;
86 }
87
88 switch (iomap.type) {
89 case IOMAP_MAPPED:
90 if (seg->iomode == IOMODE_READ)
91 bex->es = PNFS_BLOCK_READ_DATA;
92 else
93 bex->es = PNFS_BLOCK_READWRITE_DATA;
94 bex->soff = (iomap.blkno << 9);
95 break;
96 case IOMAP_UNWRITTEN:
97 if (seg->iomode & IOMODE_RW) {
98 /*
99 * Crack monkey special case from section 2.3.1.
100 */
101 if (args->lg_minlength == 0) {
102 dprintk("pnfsd: no soup for you!\n");
103 goto out_layoutunavailable;
104 }
105
106 bex->es = PNFS_BLOCK_INVALID_DATA;
107 bex->soff = (iomap.blkno << 9);
108 break;
109 }
110 /*FALLTHRU*/
111 case IOMAP_HOLE:
112 if (seg->iomode == IOMODE_READ) {
113 bex->es = PNFS_BLOCK_NONE_DATA;
114 break;
115 }
116 /*FALLTHRU*/
117 case IOMAP_DELALLOC:
118 default:
119 WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type);
120 goto out_layoutunavailable;
121 }
122
123 error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation);
124 if (error)
125 goto out_error;
126 bex->foff = iomap.offset;
127 bex->len = iomap.length;
128
129 seg->offset = iomap.offset;
130 seg->length = iomap.length;
131
85369523 132 dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es);
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133 return 0;
134
135out_error:
136 seg->length = 0;
137 return nfserrno(error);
138out_layoutunavailable:
139 seg->length = 0;
140 return nfserr_layoutunavailable;
141}
142
143static __be32
144nfsd4_block_proc_layoutcommit(struct inode *inode,
145 struct nfsd4_layoutcommit *lcp)
146{
147 loff_t new_size = lcp->lc_last_wr + 1;
148 struct iattr iattr = { .ia_valid = 0 };
149 struct iomap *iomaps;
150 int nr_iomaps;
151 int error;
152
153 nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout,
154 lcp->lc_up_len, &iomaps, 1 << inode->i_blkbits);
155 if (nr_iomaps < 0)
156 return nfserrno(nr_iomaps);
157
158 if (lcp->lc_mtime.tv_nsec == UTIME_NOW ||
159 timespec_compare(&lcp->lc_mtime, &inode->i_mtime) < 0)
160 lcp->lc_mtime = current_fs_time(inode->i_sb);
161 iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME;
162 iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime;
163
164 if (new_size > i_size_read(inode)) {
165 iattr.ia_valid |= ATTR_SIZE;
166 iattr.ia_size = new_size;
167 }
168
169 error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps,
170 nr_iomaps, &iattr);
171 kfree(iomaps);
172 return nfserrno(error);
173}
174
175const struct nfsd4_layout_ops bl_layout_ops = {
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176 /*
177 * Pretend that we send notification to the client. This is a blatant
178 * lie to force recent Linux clients to cache our device IDs.
179 * We rarely ever change the device ID, so the harm of leaking deviceids
180 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess
181 * in this regard, but I filed errata 4119 for this a while ago, and
182 * hopefully the Linux client will eventually start caching deviceids
183 * without this again.
184 */
185 .notify_types =
186 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
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187 .proc_getdeviceinfo = nfsd4_block_proc_getdeviceinfo,
188 .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo,
189 .proc_layoutget = nfsd4_block_proc_layoutget,
190 .encode_layoutget = nfsd4_block_encode_layoutget,
191 .proc_layoutcommit = nfsd4_block_proc_layoutcommit,
192};