Commit | Line | Data |
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8650b8a0 CH |
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 | ||
16 | static int | |
17 | nfsd4_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 | ||
38 | static __be32 | |
39 | nfsd4_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 | ||
47 | static __be32 | |
48 | nfsd4_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 | ||
59 | /* | |
60 | * We do not attempt to support I/O smaller than the fs block size, | |
61 | * or not aligned to it. | |
62 | */ | |
63 | if (args->lg_minlength < block_size) { | |
64 | dprintk("pnfsd: I/O too small\n"); | |
65 | goto out_layoutunavailable; | |
66 | } | |
67 | if (seg->offset & (block_size - 1)) { | |
68 | dprintk("pnfsd: I/O misaligned\n"); | |
69 | goto out_layoutunavailable; | |
70 | } | |
71 | ||
72 | /* | |
73 | * Some clients barf on non-zero block numbers for NONE or INVALID | |
74 | * layouts, so make sure to zero the whole structure. | |
75 | */ | |
76 | error = -ENOMEM; | |
77 | bex = kzalloc(sizeof(*bex), GFP_KERNEL); | |
78 | if (!bex) | |
79 | goto out_error; | |
80 | args->lg_content = bex; | |
81 | ||
82 | error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length, | |
83 | &iomap, seg->iomode != IOMODE_READ, | |
84 | &device_generation); | |
85 | if (error) { | |
86 | if (error == -ENXIO) | |
87 | goto out_layoutunavailable; | |
88 | goto out_error; | |
89 | } | |
90 | ||
91 | if (iomap.length < args->lg_minlength) { | |
92 | dprintk("pnfsd: extent smaller than minlength\n"); | |
93 | goto out_layoutunavailable; | |
94 | } | |
95 | ||
96 | switch (iomap.type) { | |
97 | case IOMAP_MAPPED: | |
98 | if (seg->iomode == IOMODE_READ) | |
99 | bex->es = PNFS_BLOCK_READ_DATA; | |
100 | else | |
101 | bex->es = PNFS_BLOCK_READWRITE_DATA; | |
102 | bex->soff = (iomap.blkno << 9); | |
103 | break; | |
104 | case IOMAP_UNWRITTEN: | |
105 | if (seg->iomode & IOMODE_RW) { | |
106 | /* | |
107 | * Crack monkey special case from section 2.3.1. | |
108 | */ | |
109 | if (args->lg_minlength == 0) { | |
110 | dprintk("pnfsd: no soup for you!\n"); | |
111 | goto out_layoutunavailable; | |
112 | } | |
113 | ||
114 | bex->es = PNFS_BLOCK_INVALID_DATA; | |
115 | bex->soff = (iomap.blkno << 9); | |
116 | break; | |
117 | } | |
118 | /*FALLTHRU*/ | |
119 | case IOMAP_HOLE: | |
120 | if (seg->iomode == IOMODE_READ) { | |
121 | bex->es = PNFS_BLOCK_NONE_DATA; | |
122 | break; | |
123 | } | |
124 | /*FALLTHRU*/ | |
125 | case IOMAP_DELALLOC: | |
126 | default: | |
127 | WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type); | |
128 | goto out_layoutunavailable; | |
129 | } | |
130 | ||
131 | error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation); | |
132 | if (error) | |
133 | goto out_error; | |
134 | bex->foff = iomap.offset; | |
135 | bex->len = iomap.length; | |
136 | ||
137 | seg->offset = iomap.offset; | |
138 | seg->length = iomap.length; | |
139 | ||
140 | dprintk("GET: %lld:%lld %d\n", bex->foff, bex->len, bex->es); | |
141 | return 0; | |
142 | ||
143 | out_error: | |
144 | seg->length = 0; | |
145 | return nfserrno(error); | |
146 | out_layoutunavailable: | |
147 | seg->length = 0; | |
148 | return nfserr_layoutunavailable; | |
149 | } | |
150 | ||
151 | static __be32 | |
152 | nfsd4_block_proc_layoutcommit(struct inode *inode, | |
153 | struct nfsd4_layoutcommit *lcp) | |
154 | { | |
155 | loff_t new_size = lcp->lc_last_wr + 1; | |
156 | struct iattr iattr = { .ia_valid = 0 }; | |
157 | struct iomap *iomaps; | |
158 | int nr_iomaps; | |
159 | int error; | |
160 | ||
161 | nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout, | |
162 | lcp->lc_up_len, &iomaps, 1 << inode->i_blkbits); | |
163 | if (nr_iomaps < 0) | |
164 | return nfserrno(nr_iomaps); | |
165 | ||
166 | if (lcp->lc_mtime.tv_nsec == UTIME_NOW || | |
167 | timespec_compare(&lcp->lc_mtime, &inode->i_mtime) < 0) | |
168 | lcp->lc_mtime = current_fs_time(inode->i_sb); | |
169 | iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME; | |
170 | iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime; | |
171 | ||
172 | if (new_size > i_size_read(inode)) { | |
173 | iattr.ia_valid |= ATTR_SIZE; | |
174 | iattr.ia_size = new_size; | |
175 | } | |
176 | ||
177 | error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps, | |
178 | nr_iomaps, &iattr); | |
179 | kfree(iomaps); | |
180 | return nfserrno(error); | |
181 | } | |
182 | ||
183 | const struct nfsd4_layout_ops bl_layout_ops = { | |
184 | .proc_getdeviceinfo = nfsd4_block_proc_getdeviceinfo, | |
185 | .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, | |
186 | .proc_layoutget = nfsd4_block_proc_layoutget, | |
187 | .encode_layoutget = nfsd4_block_encode_layoutget, | |
188 | .proc_layoutcommit = nfsd4_block_proc_layoutcommit, | |
189 | }; |