1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2014-2016 Christoph Hellwig.
5 #include <linux/exportfs.h>
6 #include <linux/iomap.h>
7 #include <linux/genhd.h>
8 #include <linux/slab.h>
11 #include <linux/nfsd/debug.h>
13 #include "blocklayoutxdr.h"
15 #include "filecache.h"
17 #define NFSDDBG_FACILITY NFSDDBG_PNFS
21 nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
22 struct nfsd4_layoutget *args)
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;
29 u32 device_generation = 0;
32 if (seg->offset & (block_size - 1)) {
33 dprintk("pnfsd: I/O misaligned\n");
34 goto out_layoutunavailable;
38 * Some clients barf on non-zero block numbers for NONE or INVALID
39 * layouts, so make sure to zero the whole structure.
42 bex = kzalloc(sizeof(*bex), GFP_KERNEL);
45 args->lg_content = bex;
47 error = sb->s_export_op->map_blocks(inode, seg->offset, seg->length,
48 &iomap, seg->iomode != IOMODE_READ,
52 goto out_layoutunavailable;
56 if (iomap.length < args->lg_minlength) {
57 dprintk("pnfsd: extent smaller than minlength\n");
58 goto out_layoutunavailable;
63 if (seg->iomode == IOMODE_READ)
64 bex->es = PNFS_BLOCK_READ_DATA;
66 bex->es = PNFS_BLOCK_READWRITE_DATA;
67 bex->soff = iomap.addr;
70 if (seg->iomode & IOMODE_RW) {
72 * Crack monkey special case from section 2.3.1.
74 if (args->lg_minlength == 0) {
75 dprintk("pnfsd: no soup for you!\n");
76 goto out_layoutunavailable;
79 bex->es = PNFS_BLOCK_INVALID_DATA;
80 bex->soff = iomap.addr;
85 if (seg->iomode == IOMODE_READ) {
86 bex->es = PNFS_BLOCK_NONE_DATA;
92 WARN(1, "pnfsd: filesystem returned %d extent\n", iomap.type);
93 goto out_layoutunavailable;
96 error = nfsd4_set_deviceid(&bex->vol_id, fhp, device_generation);
99 bex->foff = iomap.offset;
100 bex->len = iomap.length;
102 seg->offset = iomap.offset;
103 seg->length = iomap.length;
105 dprintk("GET: 0x%llx:0x%llx %d\n", bex->foff, bex->len, bex->es);
110 return nfserrno(error);
111 out_layoutunavailable:
113 return nfserr_layoutunavailable;
117 nfsd4_block_commit_blocks(struct inode *inode, struct nfsd4_layoutcommit *lcp,
118 struct iomap *iomaps, int nr_iomaps)
120 loff_t new_size = lcp->lc_last_wr + 1;
121 struct iattr iattr = { .ia_valid = 0 };
124 if (lcp->lc_mtime.tv_nsec == UTIME_NOW ||
125 timespec64_compare(&lcp->lc_mtime, &inode->i_mtime) < 0)
126 lcp->lc_mtime = current_time(inode);
127 iattr.ia_valid |= ATTR_ATIME | ATTR_CTIME | ATTR_MTIME;
128 iattr.ia_atime = iattr.ia_ctime = iattr.ia_mtime = lcp->lc_mtime;
130 if (new_size > i_size_read(inode)) {
131 iattr.ia_valid |= ATTR_SIZE;
132 iattr.ia_size = new_size;
135 error = inode->i_sb->s_export_op->commit_blocks(inode, iomaps,
138 return nfserrno(error);
141 #ifdef CONFIG_NFSD_BLOCKLAYOUT
143 nfsd4_block_get_device_info_simple(struct super_block *sb,
144 struct nfsd4_getdeviceinfo *gdp)
146 struct pnfs_block_deviceaddr *dev;
147 struct pnfs_block_volume *b;
149 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
150 sizeof(struct pnfs_block_volume), GFP_KERNEL);
153 gdp->gd_device = dev;
156 b = &dev->volumes[0];
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,
165 nfsd4_block_proc_getdeviceinfo(struct super_block *sb,
166 struct svc_rqst *rqstp,
167 struct nfs4_client *clp,
168 struct nfsd4_getdeviceinfo *gdp)
170 if (bdev_is_partition(sb->s_bdev))
172 return nfserrno(nfsd4_block_get_device_info_simple(sb, gdp));
176 nfsd4_block_proc_layoutcommit(struct inode *inode,
177 struct nfsd4_layoutcommit *lcp)
179 struct iomap *iomaps;
182 nr_iomaps = nfsd4_block_decode_layoutupdate(lcp->lc_up_layout,
183 lcp->lc_up_len, &iomaps, i_blocksize(inode));
185 return nfserrno(nr_iomaps);
187 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
190 const struct nfsd4_layout_ops bl_layout_ops = {
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.
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,
208 #endif /* CONFIG_NFSD_BLOCKLAYOUT */
210 #ifdef CONFIG_NFSD_SCSILAYOUT
211 #define NFSD_MDS_PR_KEY 0x0100000000000000ULL
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.
217 static u64 nfsd4_scsi_pr_key(struct nfs4_client *clp)
219 return ((u64)clp->cl_clientid.cl_boot << 32) | clp->cl_clientid.cl_id;
222 static const u8 designator_types[] = {
228 nfsd4_block_get_unique_id(struct gendisk *disk, struct pnfs_block_volume *b)
232 for (i = 0; i < ARRAY_SIZE(designator_types); i++) {
233 u8 type = designator_types[i];
235 ret = disk->fops->get_unique_id(disk, b->scsi.designator, type);
237 b->scsi.code_set = PS_CODE_SET_BINARY;
238 b->scsi.designator_type = type;
239 b->scsi.designator_len = ret;
248 nfsd4_block_get_device_info_scsi(struct super_block *sb,
249 struct nfs4_client *clp,
250 struct nfsd4_getdeviceinfo *gdp)
252 struct pnfs_block_deviceaddr *dev;
253 struct pnfs_block_volume *b;
254 const struct pr_ops *ops;
257 dev = kzalloc(sizeof(struct pnfs_block_deviceaddr) +
258 sizeof(struct pnfs_block_volume), GFP_KERNEL);
261 gdp->gd_device = dev;
264 b = &dev->volumes[0];
266 b->type = PNFS_BLOCK_VOLUME_SCSI;
267 b->scsi.pr_key = nfsd4_scsi_pr_key(clp);
269 ret = nfsd4_block_get_unique_id(sb->s_bdev->bd_disk, b);
274 ops = sb->s_bdev->bd_disk->fops->pr_ops;
276 pr_err("pNFS: device %s does not support PRs.\n",
281 ret = ops->pr_register(sb->s_bdev, 0, NFSD_MDS_PR_KEY, true);
283 pr_err("pNFS: failed to register key for device %s.\n",
288 ret = ops->pr_reserve(sb->s_bdev, NFSD_MDS_PR_KEY,
289 PR_EXCLUSIVE_ACCESS_REG_ONLY, 0);
291 pr_err("pNFS: failed to reserve device %s.\n",
304 nfsd4_scsi_proc_getdeviceinfo(struct super_block *sb,
305 struct svc_rqst *rqstp,
306 struct nfs4_client *clp,
307 struct nfsd4_getdeviceinfo *gdp)
309 if (bdev_is_partition(sb->s_bdev))
311 return nfserrno(nfsd4_block_get_device_info_scsi(sb, clp, gdp));
314 nfsd4_scsi_proc_layoutcommit(struct inode *inode,
315 struct nfsd4_layoutcommit *lcp)
317 struct iomap *iomaps;
320 nr_iomaps = nfsd4_scsi_decode_layoutupdate(lcp->lc_up_layout,
321 lcp->lc_up_len, &iomaps, i_blocksize(inode));
323 return nfserrno(nr_iomaps);
325 return nfsd4_block_commit_blocks(inode, lcp, iomaps, nr_iomaps);
329 nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls)
331 struct nfs4_client *clp = ls->ls_stid.sc_client;
332 struct block_device *bdev = ls->ls_file->nf_file->f_path.mnt->mnt_sb->s_bdev;
334 bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY,
335 nfsd4_scsi_pr_key(clp), 0, true);
338 const struct nfsd4_layout_ops scsi_layout_ops = {
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.
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,
357 #endif /* CONFIG_NFSD_SCSILAYOUT */