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 #include "vfs.h" 16 17 #define NFSDDBG_FACILITY NFSDDBG_PNFS 18 19 20 static __be32 21 nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp, 22 struct nfsd4_layoutget *args) 23 { 24 struct nfsd4_layout_seg *seg = &args->lg_seg; 25 struct super_block *sb = inode->i_sb; 26 u32 block_size = i_blocksize(inode); 27 struct pnfs_block_extent *bex; 28 struct iomap iomap; 29 u32 device_generation = 0; 30 int error; 31 32 if (seg->offset & (block_size - 1)) { 33 dprintk("pnfsd: I/O misaligned\n"); 34 goto out_layoutunavailable; 35 } 36 37 /* 38 * Some clients barf on non-zero block numbers for NONE or INVALID 39 * layouts, so make sure to zero the whole structure. 40 */ 41 error = -ENOMEM; 42 bex = kzalloc(sizeof(*bex), GFP_KERNEL); 43 if (!bex) 44 goto out_error; 45 args->lg_content = bex; 46 47 error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length, 48 &iomap, seg->iomode != IOMODE_READ, 49 &device_generation); 50 if (error) { 51 if (error == -ENXIO) 52 goto out_layoutunavailable; 53 goto out_error; 54 } 55 56 if (iomap.length < args->lg_minlength) { 57 dprintk("pnfsd: extent smaller than minlength\n"); 58 goto out_layoutunavailable; 59 } 60 61 switch (iomap.type) { 62 case IOMAP_MAPPED: 63 if (seg->iomode == IOMODE_READ) 64 bex->es = PNFS_BLOCK_READ_DATA; 65 else 66 bex->es = PNFS_BLOCK_READWRITE_DATA; 67 bex->soff = iomap.addr; 68 break; 69 case IOMAP_UNWRITTEN: 70 if (seg->iomode & IOMODE_RW) { 71 /* 72 * Crack monkey special case from section 2.3.1. 73 */ 74 if (args->lg_minlength == 0) { 75 dprintk("pnfsd: no soup for you!\n"); 76 goto out_layoutunavailable; 77 } 78 79 bex->es = PNFS_BLOCK_INVALID_DATA; 80 bex->soff = iomap.addr; 81 break; 82 } 83 fallthrough; 84 case IOMAP_HOLE: 85 if (seg->iomode == IOMODE_READ) { 86 bex->es = PNFS_BLOCK_NONE_DATA; 87 break; 88 } 89 fallthrough; 90 case IOMAP_DELALLOC: 91 default: 92 WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type); 93 goto out_layoutunavailable; 94 } 95 96 error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation); 97 if (error) 98 goto out_error; 99 bex->foff = iomap.offset; 100 bex->len = iomap.length; 101 102 seg->offset = iomap.offset; 103 seg->length = iomap.length; 104 105 dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es); 106 return 0; 107 108 out_error: 109 seg->length = 0; 110 return nfserrno(error); 111 out_layoutunavailable: 112 seg->length = 0; 113 return nfserr_layoutunavailable; 114 } 115 116 static __be32 117 nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp, 118 struct iomap *iomaps, int nr_iomaps) 119 { 120 struct timespec64 mtime = inode_get_mtime(inode); 121 loff_t new_size = lcp->lc_last_wr + 1; 122 struct iattr iattr = { .ia_valid = 0 }; 123 int error; 124 125 if (lcp->lc_mtime.tv_nsec == UTIME_NOW || 126 timespec64_compare(&lcp->lc_mtime, &mtime) < 0) 127 lcp->lc_mtime = current_time(inode); 128 iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME; 129 iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime; 130 131 if (new_size > i_size_read(inode)) { 132 iattr.ia_valid |= ATTR_SIZE; 133 iattr.ia_size = new_size; 134 } 135 136 error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps, 137 nr_iomaps, &iattr); 138 kfree(iomaps); 139 return nfserrno(error); 140 } 141 142 #ifdef CONFIG_NFSD_BLOCKLAYOUT 143 static int 144 nfsd4_block_get_device_info_simple(struct super_block *sb, 145 struct nfsd4_getdeviceinfo *gdp) 146 { 147 struct pnfs_block_deviceaddr *dev; 148 struct pnfs_block_volume *b; 149 150 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + 151 sizeof(struct pnfs_block_volume), GFP_KERNEL); 152 if (!dev) 153 return -ENOMEM; 154 gdp->gd_device = dev; 155 156 dev->nr_volumes = 1; 157 b = &dev->volumes[0]; 158 159 b->type = PNFS_BLOCK_VOLUME_SIMPLE; 160 b->simple.sig_len = PNFS_BLOCK_UUID_LEN; 161 return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len, 162 &b->simple.offset); 163 } 164 165 static __be32 166 nfsd4_block_proc_getdeviceinfo(struct super_block *sb, 167 struct svc_rqst *rqstp, 168 struct nfs4_client *clp, 169 struct nfsd4_getdeviceinfo *gdp) 170 { 171 if (bdev_is_partition(sb->s_bdev)) 172 return nfserr_inval; 173 return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp)); 174 } 175 176 static __be32 177 nfsd4_block_proc_layoutcommit(struct inode *inode, 178 struct nfsd4_layoutcommit *lcp) 179 { 180 struct iomap *iomaps; 181 int nr_iomaps; 182 183 nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout, 184 lcp->lc_up_len, &iomaps, i_blocksize(inode)); 185 if (nr_iomaps < 0) 186 return nfserrno(nr_iomaps); 187 188 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); 189 } 190 191 const struct nfsd4_layout_ops bl_layout_ops = { 192 /* 193 * Pretend that we send notification to the client. This is a blatant 194 * lie to force recent Linux clients to cache our device IDs. 195 * We rarely ever change the device ID, so the harm of leaking deviceids 196 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess 197 * in this regard, but I filed errata 4119 for this a while ago, and 198 * hopefully the Linux client will eventually start caching deviceids 199 * without this again. 200 */ 201 .notify_types = 202 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, 203 .proc_getdeviceinfo = nfsd4_block_proc_getdeviceinfo, 204 .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, 205 .proc_layoutget = nfsd4_block_proc_layoutget, 206 .encode_layoutget = nfsd4_block_encode_layoutget, 207 .proc_layoutcommit = nfsd4_block_proc_layoutcommit, 208 }; 209 #endif /* CONFIG_NFSD_BLOCKLAYOUT */ 210 211 #ifdef CONFIG_NFSD_SCSILAYOUT 212 #define NFSD_MDS_PR_KEY 0x0100000000000000ULL 213 214 /* 215 * We use the client ID as a unique key for the reservations. 216 * This allows us to easily fence a client when recalls fail. 217 */ 218 static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp) 219 { 220 return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id; 221 } 222 223 static const u8 designator_types[] = { 224 PS_DESIGNATOR_EUI64, 225 PS_DESIGNATOR_NAA, 226 }; 227 228 static int 229 nfsd4_block_get_unique_id(struct gendisk *disk, struct pnfs_block_volume *b) 230 { 231 int ret, i; 232 233 for (i = 0; i < ARRAY_SIZE(designator_types); i++) { 234 u8 type = designator_types[i]; 235 236 ret = disk->fops->get_unique_id(disk, b->scsi.designator, type); 237 if (ret > 0) { 238 b->scsi.code_set = PS_CODE_SET_BINARY; 239 b->scsi.designator_type = type; 240 b->scsi.designator_len = ret; 241 return 0; 242 } 243 } 244 245 return -EINVAL; 246 } 247 248 static int 249 nfsd4_block_get_device_info_scsi(struct super_block *sb, 250 struct nfs4_client *clp, 251 struct nfsd4_getdeviceinfo *gdp) 252 { 253 struct pnfs_block_deviceaddr *dev; 254 struct pnfs_block_volume *b; 255 const struct pr_ops *ops; 256 int ret; 257 258 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) + 259 sizeof(struct pnfs_block_volume), GFP_KERNEL); 260 if (!dev) 261 return -ENOMEM; 262 gdp->gd_device = dev; 263 264 dev->nr_volumes = 1; 265 b = &dev->volumes[0]; 266 267 b->type = PNFS_BLOCK_VOLUME_SCSI; 268 b->scsi.pr_key = nfsd4_scsi_pr_key(clp); 269 270 ret = nfsd4_block_get_unique_id(sb->s_bdev->bd_disk, b); 271 if (ret < 0) 272 goto out_free_dev; 273 274 ret = -EINVAL; 275 ops = sb->s_bdev->bd_disk->fops->pr_ops; 276 if (!ops) { 277 pr_err("pNFS: device %s does not support PRs.\n", 278 sb->s_id); 279 goto out_free_dev; 280 } 281 282 ret = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true); 283 if (ret) { 284 pr_err("pNFS: failed to register key for device %s.\n", 285 sb->s_id); 286 goto out_free_dev; 287 } 288 289 ret = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY, 290 PR_EXCLUSIVE_ACCESS_REG_ONLY, 0); 291 if (ret) { 292 pr_err("pNFS: failed to reserve device %s.\n", 293 sb->s_id); 294 goto out_free_dev; 295 } 296 297 return 0; 298 299 out_free_dev: 300 kfree(dev); 301 gdp->gd_device = NULL; 302 return ret; 303 } 304 305 static __be32 306 nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb, 307 struct svc_rqst *rqstp, 308 struct nfs4_client *clp, 309 struct nfsd4_getdeviceinfo *gdp) 310 { 311 if (bdev_is_partition(sb->s_bdev)) 312 return nfserr_inval; 313 return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp)); 314 } 315 static __be32 316 nfsd4_scsi_proc_layoutcommit(struct inode *inode, 317 struct nfsd4_layoutcommit *lcp) 318 { 319 struct iomap *iomaps; 320 int nr_iomaps; 321 322 nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout, 323 lcp->lc_up_len, &iomaps, i_blocksize(inode)); 324 if (nr_iomaps < 0) 325 return nfserrno(nr_iomaps); 326 327 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps); 328 } 329 330 static void 331 nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls, struct nfsd_file *file) 332 { 333 struct nfs4_client *clp = ls->ls_stid.sc_client; 334 struct block_device *bdev = file->nf_file->f_path.mnt->mnt_sb->s_bdev; 335 336 bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY, 337 nfsd4_scsi_pr_key(clp), 0, true); 338 } 339 340 const struct nfsd4_layout_ops scsi_layout_ops = { 341 /* 342 * Pretend that we send notification to the client. This is a blatant 343 * lie to force recent Linux clients to cache our device IDs. 344 * We rarely ever change the device ID, so the harm of leaking deviceids 345 * for a while isn't too bad. Unfortunately RFC5661 is a complete mess 346 * in this regard, but I filed errata 4119 for this a while ago, and 347 * hopefully the Linux client will eventually start caching deviceids 348 * without this again. 349 */ 350 .notify_types = 351 NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE, 352 .proc_getdeviceinfo = nfsd4_scsi_proc_getdeviceinfo, 353 .encode_getdeviceinfo = nfsd4_block_encode_getdeviceinfo, 354 .proc_layoutget = nfsd4_block_proc_layoutget, 355 .encode_layoutget = nfsd4_block_encode_layoutget, 356 .proc_layoutcommit = nfsd4_scsi_proc_layoutcommit, 357 .fence_client = nfsd4_scsi_fence_client, 358 }; 359 #endif /* CONFIG_NFSD_SCSILAYOUT */ 360