fs/nfsd/blocklayout.c

   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(struct_size(dev, volumes, 1), GFP_KERNEL);
 151         if (!dev)
 152                 return -ENOMEM;
 153         gdp->gd_device = dev;
 154
 155         dev->nr_volumes = 1;
 156         b = &dev->volumes[0];
 157
 158         b->type = PNFS_BLOCK_VOLUME_SIMPLE;
 159         b->simple.sig_len = PNFS_BLOCK_UUID_LEN;
 160         return sb->s_export_op->get_uuid(sb, b->simple.sig, &b->simple.sig_len,
 161                         &b->simple.offset);
 162 }
 163
 164 static __be32
 165 nfsd4_block_proc_getdeviceinfo(struct super_block *sb,
 166                 struct svc_rqst *rqstp,
 167                 struct nfs4_client *clp,
 168                 struct nfsd4_getdeviceinfo *gdp)
 169 {
 170         if (bdev_is_partition(sb->s_bdev))
 171                 return nfserr_inval;
 172         return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp));
 173 }
 174
 175 static __be32
 176 nfsd4_block_proc_layoutcommit(struct inode *inode,
 177                 struct nfsd4_layoutcommit *lcp)
 178 {
 179         struct iomap *iomaps;
 180         int nr_iomaps;
 181
 182         nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout,
 183                         lcp->lc_up_len, &iomaps, i_blocksize(inode));
 184         if (nr_iomaps < 0)
 185                 return nfserrno(nr_iomaps);
 186
 187         return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
 188 }
 189
 190 const struct nfsd4_layout_ops bl_layout_ops = {
 191         /*
 192          * Pretend that we send notification to the client.  This is a blatant
 193          * lie to force recent Linux clients to cache our device IDs.
 194          * We rarely ever change the device ID, so the harm of leaking deviceids
 195          * for a while isn't too bad.  Unfortunately RFC5661 is a complete mess
 196          * in this regard, but I filed errata 4119 for this a while ago, and
 197          * hopefully the Linux client will eventually start caching deviceids
 198          * without this again.
 199          */
 200         .notify_types           =
 201                         NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
 202         .proc_getdeviceinfo     = nfsd4_block_proc_getdeviceinfo,
 203         .encode_getdeviceinfo   = nfsd4_block_encode_getdeviceinfo,
 204         .proc_layoutget         = nfsd4_block_proc_layoutget,
 205         .encode_layoutget       = nfsd4_block_encode_layoutget,
 206         .proc_layoutcommit      = nfsd4_block_proc_layoutcommit,
 207 };
 208 #endif /* CONFIG_NFSD_BLOCKLAYOUT */
 209
 210 #ifdef CONFIG_NFSD_SCSILAYOUT
 211 #define NFSD_MDS_PR_KEY         0x0100000000000000ULL
 212
 213 /*
 214  * We use the client ID as a unique key for the reservations.
 215  * This allows us to easily fence a client when recalls fail.
 216  */
 217 static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp)
 218 {
 219         return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id;
 220 }
 221
 222 static const u8 designator_types[] = {
 223         PS_DESIGNATOR_EUI64,
 224         PS_DESIGNATOR_NAA,
 225 };
 226
 227 static int
 228 nfsd4_block_get_unique_id(struct gendisk *disk, struct pnfs_block_volume *b)
 229 {
 230         int ret, i;
 231
 232         for (i = 0; i < ARRAY_SIZE(designator_types); i++) {
 233                 u8 type = designator_types[i];
 234
 235                 ret = disk->fops->get_unique_id(disk, b->scsi.designator, type);
 236                 if (ret > 0) {
 237                         b->scsi.code_set = PS_CODE_SET_BINARY;
 238                         b->scsi.designator_type = type;
 239                         b->scsi.designator_len = ret;
 240                         return 0;
 241                 }
 242         }
 243
 244         return -EINVAL;
 245 }
 246
 247 static int
 248 nfsd4_block_get_device_info_scsi(struct super_block *sb,
 249                 struct nfs4_client *clp,
 250                 struct nfsd4_getdeviceinfo *gdp)
 251 {
 252         struct pnfs_block_deviceaddr *dev;
 253         struct pnfs_block_volume *b;
 254         const struct pr_ops *ops;
 255         int ret;
 256
 257         dev = kzalloc(struct_size(dev, volumes, 1), 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         gdp->gd_device = NULL;
 300         return ret;
 301 }
 302
 303 static __be32
 304 nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb,
 305                 struct svc_rqst *rqstp,
 306                 struct nfs4_client *clp,
 307                 struct nfsd4_getdeviceinfo *gdp)
 308 {
 309         if (bdev_is_partition(sb->s_bdev))
 310                 return nfserr_inval;
 311         return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp));
 312 }
 313 static __be32
 314 nfsd4_scsi_proc_layoutcommit(struct inode *inode,
 315                 struct nfsd4_layoutcommit *lcp)
 316 {
 317         struct iomap *iomaps;
 318         int nr_iomaps;
 319
 320         nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout,
 321                         lcp->lc_up_len, &iomaps, i_blocksize(inode));
 322         if (nr_iomaps < 0)
 323                 return nfserrno(nr_iomaps);
 324
 325         return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
 326 }
 327
 328 static void
 329 nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls, struct nfsd_file *file)
 330 {
 331         struct nfs4_client *clp = ls->ls_stid.sc_client;
 332         struct block_device *bdev = file->nf_file->f_path.mnt->mnt_sb->s_bdev;
 333
 334         bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY,
 335                         nfsd4_scsi_pr_key(clp), 0, true);
 336 }
 337
 338 const struct nfsd4_layout_ops scsi_layout_ops = {
 339         /*
 340          * Pretend that we send notification to the client.  This is a blatant
 341          * lie to force recent Linux clients to cache our device IDs.
 342          * We rarely ever change the device ID, so the harm of leaking deviceids
 343          * for a while isn't too bad.  Unfortunately RFC5661 is a complete mess
 344          * in this regard, but I filed errata 4119 for this a while ago, and
 345          * hopefully the Linux client will eventually start caching deviceids
 346          * without this again.
 347          */
 348         .notify_types           =
 349                         NOTIFY_DEVICEID4_DELETE | NOTIFY_DEVICEID4_CHANGE,
 350         .proc_getdeviceinfo     = nfsd4_scsi_proc_getdeviceinfo,
 351         .encode_getdeviceinfo   = nfsd4_block_encode_getdeviceinfo,
 352         .proc_layoutget         = nfsd4_block_proc_layoutget,
 353         .encode_layoutget       = nfsd4_block_encode_layoutget,
 354         .proc_layoutcommit      = nfsd4_scsi_proc_layoutcommit,
 355         .fence_client           = nfsd4_scsi_fence_client,
 356 };
 357 #endif /* CONFIG_NFSD_SCSILAYOUT */