1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2014-2016 Christoph Hellwig. 4 */ 5 #include <linux/exportfs.h> 6 #include <linux/iomap.h> 7 #include <linux/slab.h> 8 #include <linux/pr.h> 9 10 #include <linux/nfsd/debug.h> 11 12 #include "blocklayoutxdr.h" 13 #include "pnfs.h" 14 #include "filecache.h" 15 16 #define NFSDDBG_FACILITY NFSDDBG_PNFS 17 18 19 static __be32 20 nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp, 21 struct nfsd4_layoutget *args) 22 { 23 struct nfsd4_layout_seg *seg = &args->lg_seg; 24 struct super_block *sb = inode->i_sb; 25 u32 block_size = i_blocksize(inode); 26 struct pnfs_block_extent *bex; 27 struct iomap iomap; 28 u32 device_generation = 0; 29 int error; 30 31 if (seg->offset & (block_size - 1)) { 32 dprintk("pnfsd: I/O misaligned\n"); 33 goto out_layoutunavailable; 34 } 35 36 /* 37 * Some clients barf on non-zero block numbers for NONE or INVALID 38 * layouts, so make sure to zero the whole structure. 39 */ 40 error = -ENOMEM; 41 bex = kzalloc(sizeof(*bex), GFP_KERNEL); 42 if (!bex) 43 goto out_error; 44 args->lg_content = bex; 45 46 error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length, 47 &iomap, seg->iomode != IOMODE_READ, 48 &device_generation); 49 if (error) { 50 if (error == -ENXIO) 51 goto out_layoutunavailable; 52 goto out_error; 53 } 54 55 if (iomap.length < args->lg_minlength) { 56 dprintk("pnfsd: extent smaller than minlength\n"); 57 goto out_layoutunavailable; 58 } 59 60 switch (iomap.type) { 61 case IOMAP_MAPPED: 62 if (seg->iomode == IOMODE_READ) 63 bex->es = PNFS_BLOCK_READ_DATA; 64 else 65 bex->es = PNFS_BLOCK_READWRITE_DATA; 66 bex->soff = iomap.addr; 67 break; 68 case IOMAP_UNWRITTEN: 69 if (seg->iomode & IOMODE_RW) { 70 /* 71 * Crack monkey special case from section 2.3.1. 72 */ 73 if (args->lg_minlength == 0) { 74 dprintk("pnfsd: no soup for you!\n"); 75 goto out_layoutunavailable; 76 } 77 78 bex->es = PNFS_BLOCK_INVALID_DATA; 79 bex->soff = iomap.addr; 80 break; 81 } 82 fallthrough; 83 case IOMAP_HOLE: 84 if (seg->iomode == IOMODE_READ) { 85 bex->es = PNFS_BLOCK_NONE_DATA; 86 break; 87 } 88 fallthrough; 89 case IOMAP_DELALLOC: 90 default: 91 WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type); 92 goto out_layoutunavailable; 93 } 94 95 error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation); 96 if (error) 97 goto out_error; 98 bex->foff = iomap.offset; 99 bex->len = iomap.length; 100 101 seg->offset = iomap.offset; 102 seg->length = iomap.length; 103 104 dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es); 105 return 0; 106 107 out_error: 108 seg->length = 0; 109 return nfserrno(error); 110 out_layoutunavailable: 111 seg->length = 0; 112 return nfserr_layoutunavailable; 113 } 114 115 static __be32 116 nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp, 117 struct iomap *iomaps, int nr_iomaps) 118 { 119 loff_t new_size = lcp->lc_last_wr + 1; 120 struct iattr iattr = { .ia_valid = 0 }; 121 int error; 122 123 if (lcp->lc_mtime.tv_nsec == UTIME_NOW || 124 timespec64_compare(&lcp->lc_mtime, &inode->i_mtime) < 0) 125 lcp->lc_mtime = current_time(inode); 126 iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME; 127 iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime; 128 129 if (new_size > i_size_read(inode)) { 130 iattr.ia_valid |= ATTR_SIZE; 131 iattr.ia_size = new_size; 132 } 133 134 error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps, 135 nr_iomaps, &iattr); 136 kfree(iomaps); 137 return nfserrno(error); 138 } 139 140 #ifdef CONFIG_NFSD_BLOCKLAYOUT 141 static int 142 nfsd4_block_get_device_info_simple(struct super_block *sb, 143 struct nfsd4_getdeviceinfo *gdp) 144 { 145 struct pnfs_block_deviceaddr *dev; 146 struct pnfs_block_volume *b; 147 148 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + 149 sizeof(struct pnfs_block_volume), GFP_KERNEL); 150 if (!dev) 151 return -ENOMEM; 152 gdp->gd_device = dev; 153 154 dev->nr_volumes = 1; 155 b = &dev->volumes[0]; 156 157 b->type = PNFS_BLOCK_VOLUME_SIMPLE; 158 b->simple.sig_len = PNFS_BLOCK_UUID_LEN; 159 return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len, 160 &b->simple.offset); 161 } 162 163 static __be32 164 nfsd4_block_proc_getdeviceinfo(struct super_block *sb, 165 struct svc_rqst *rqstp, 166 struct nfs4_client *clp, 167 struct nfsd4_getdeviceinfo *gdp) 168 { 169 if (bdev_is_partition(sb->s_bdev)) 170 return nfserr_inval; 171 return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp)); 172 } 173 174 static __be32 175 nfsd4_block_proc_layoutcommit(struct inode *inode, 176 struct nfsd4_layoutcommit *lcp) 177 { 178 struct iomap *iomaps; 179 int nr_iomaps; 180 181 nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout, 182 lcp->lc_up_len, &iomaps, i_blocksize(inode)); 183 if (nr_iomaps < 0) 184 return nfserrno(nr_iomaps); 185 186 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); 187 } 188 189 const struct nfsd4_layout_ops bl_layout_ops = { 190 /* 191 * Pretend that we send notification to the client. This is a blatant 192 * lie to force recent Linux clients to cache our device IDs. 193 * We rarely ever change the device ID, so the harm of leaking deviceids 194 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess 195 * in this regard, but I filed errata 4119 for this a while ago, and 196 * hopefully the Linux client will eventually start caching deviceids 197 * without this again. 198 */ 199 .notify_types = 200 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, 201 .proc_getdeviceinfo = nfsd4_block_proc_getdeviceinfo, 202 .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, 203 .proc_layoutget = nfsd4_block_proc_layoutget, 204 .encode_layoutget = nfsd4_block_encode_layoutget, 205 .proc_layoutcommit = nfsd4_block_proc_layoutcommit, 206 }; 207 #endif /* CONFIG_NFSD_BLOCKLAYOUT */ 208 209 #ifdef CONFIG_NFSD_SCSILAYOUT 210 #define NFSD_MDS_PR_KEY 0x0100000000000000ULL 211 212 /* 213 * We use the client ID as a unique key for the reservations. 214 * This allows us to easily fence a client when recalls fail. 215 */ 216 static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp) 217 { 218 return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id; 219 } 220 221 static const u8 designator_types[] = { 222 PS_DESIGNATOR_EUI64, 223 PS_DESIGNATOR_NAA, 224 }; 225 226 static int 227 nfsd4_block_get_unique_id(struct gendisk *disk, struct pnfs_block_volume *b) 228 { 229 int ret, i; 230 231 for (i = 0; i < ARRAY_SIZE(designator_types); i++) { 232 u8 type = designator_types[i]; 233 234 ret = disk->fops->get_unique_id(disk, b->scsi.designator, type); 235 if (ret > 0) { 236 b->scsi.code_set = PS_CODE_SET_BINARY; 237 b->scsi.designator_type = type; 238 b->scsi.designator_len = ret; 239 return 0; 240 } 241 } 242 243 return -EINVAL; 244 } 245 246 static int 247 nfsd4_block_get_device_info_scsi(struct super_block *sb, 248 struct nfs4_client *clp, 249 struct nfsd4_getdeviceinfo *gdp) 250 { 251 struct pnfs_block_deviceaddr *dev; 252 struct pnfs_block_volume *b; 253 const struct pr_ops *ops; 254 int ret; 255 256 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + 257 sizeof(struct pnfs_block_volume), GFP_KERNEL); 258 if (!dev) 259 return -ENOMEM; 260 gdp->gd_device = dev; 261 262 dev->nr_volumes = 1; 263 b = &dev->volumes[0]; 264 265 b->type = PNFS_BLOCK_VOLUME_SCSI; 266 b->scsi.pr_key = nfsd4_scsi_pr_key(clp); 267 268 ret = nfsd4_block_get_unique_id(sb->s_bdev->bd_disk, b); 269 if (ret < 0) 270 goto out_free_dev; 271 272 ret = -EINVAL; 273 ops = sb->s_bdev->bd_disk->fops->pr_ops; 274 if (!ops) { 275 pr_err("pNFS: device %s does not support PRs.\n", 276 sb->s_id); 277 goto out_free_dev; 278 } 279 280 ret = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true); 281 if (ret) { 282 pr_err("pNFS: failed to register key for device %s.\n", 283 sb->s_id); 284 goto out_free_dev; 285 } 286 287 ret = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY, 288 PR_EXCLUSIVE_ACCESS_REG_ONLY, 0); 289 if (ret) { 290 pr_err("pNFS: failed to reserve device %s.\n", 291 sb->s_id); 292 goto out_free_dev; 293 } 294 295 return 0; 296 297 out_free_dev: 298 kfree(dev); 299 return ret; 300 } 301 302 static __be32 303 nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb, 304 struct svc_rqst *rqstp, 305 struct nfs4_client *clp, 306 struct nfsd4_getdeviceinfo *gdp) 307 { 308 if (bdev_is_partition(sb->s_bdev)) 309 return nfserr_inval; 310 return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp)); 311 } 312 static __be32 313 nfsd4_scsi_proc_layoutcommit(struct inode *inode, 314 struct nfsd4_layoutcommit *lcp) 315 { 316 struct iomap *iomaps; 317 int nr_iomaps; 318 319 nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout, 320 lcp->lc_up_len, &iomaps, i_blocksize(inode)); 321 if (nr_iomaps < 0) 322 return nfserrno(nr_iomaps); 323 324 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); 325 } 326 327 static void 328 nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls) 329 { 330 struct nfs4_client *clp = ls->ls_stid.sc_client; 331 struct block_device *bdev = ls->ls_file->nf_file->f_path.mnt->mnt_sb->s_bdev; 332 333 bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY, 334 nfsd4_scsi_pr_key(clp), 0, true); 335 } 336 337 const struct nfsd4_layout_ops scsi_layout_ops = { 338 /* 339 * Pretend that we send notification to the client. This is a blatant 340 * lie to force recent Linux clients to cache our device IDs. 341 * We rarely ever change the device ID, so the harm of leaking deviceids 342 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess 343 * in this regard, but I filed errata 4119 for this a while ago, and 344 * hopefully the Linux client will eventually start caching deviceids 345 * without this again. 346 */ 347 .notify_types = 348 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, 349 .proc_getdeviceinfo = nfsd4_scsi_proc_getdeviceinfo, 350 .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, 351 .proc_layoutget = nfsd4_block_proc_layoutget, 352 .encode_layoutget = nfsd4_block_encode_layoutget, 353 .proc_layoutcommit = nfsd4_scsi_proc_layoutcommit, 354 .fence_client = nfsd4_scsi_fence_client, 355 }; 356 #endif /* CONFIG_NFSD_SCSILAYOUT */ 357