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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/nfs/file.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 */
7#include <linux/fs.h>
8#include <linux/file.h>
9#include <linux/falloc.h>
10#include <linux/nfs_fs.h>
11#include "delegation.h"
12#include "internal.h"
13#include "iostat.h"
14#include "fscache.h"
15#include "pnfs.h"
16
17#include "nfstrace.h"
18
19#ifdef CONFIG_NFS_V4_2
20#include "nfs42.h"
21#endif
22
23#define NFSDBG_FACILITY NFSDBG_FILE
24
25static int
26nfs4_file_open(struct inode *inode, struct file *filp)
27{
28 struct nfs_open_context *ctx;
29 struct dentry *dentry = file_dentry(filp);
30 struct dentry *parent = NULL;
31 struct inode *dir;
32 unsigned openflags = filp->f_flags;
33 struct iattr attr;
34 int err;
35
36 /*
37 * If no cached dentry exists or if it's negative, NFSv4 handled the
38 * opens in ->lookup() or ->create().
39 *
40 * We only get this far for a cached positive dentry. We skipped
41 * revalidation, so handle it here by dropping the dentry and returning
42 * -EOPENSTALE. The VFS will retry the lookup/create/open.
43 */
44
45 dprintk("NFS: open file(%pd2)\n", dentry);
46
47 err = nfs_check_flags(openflags);
48 if (err)
49 return err;
50
51 if ((openflags & O_ACCMODE) == 3)
52 openflags--;
53
54 /* We can't create new files here */
55 openflags &= ~(O_CREAT|O_EXCL);
56
57 parent = dget_parent(dentry);
58 dir = d_inode(parent);
59
60 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
61 err = PTR_ERR(ctx);
62 if (IS_ERR(ctx))
63 goto out;
64
65 attr.ia_valid = ATTR_OPEN;
66 if (openflags & O_TRUNC) {
67 attr.ia_valid |= ATTR_SIZE;
68 attr.ia_size = 0;
69 filemap_write_and_wait(inode->i_mapping);
70 }
71
72 inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
73 if (IS_ERR(inode)) {
74 err = PTR_ERR(inode);
75 switch (err) {
76 case -EPERM:
77 case -EACCES:
78 case -EDQUOT:
79 case -ENOSPC:
80 case -EROFS:
81 goto out_put_ctx;
82 default:
83 goto out_drop;
84 }
85 }
86 if (inode != d_inode(dentry))
87 goto out_drop;
88
89 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
90 nfs_file_set_open_context(filp, ctx);
91 nfs_fscache_open_file(inode, filp);
92 err = 0;
93
94out_put_ctx:
95 put_nfs_open_context(ctx);
96out:
97 dput(parent);
98 return err;
99
100out_drop:
101 d_drop(dentry);
102 err = -EOPENSTALE;
103 goto out_put_ctx;
104}
105
106/*
107 * Flush all dirty pages, and check for write errors.
108 */
109static int
110nfs4_file_flush(struct file *file, fl_owner_t id)
111{
112 struct inode *inode = file_inode(file);
113
114 dprintk("NFS: flush(%pD2)\n", file);
115
116 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
117 if ((file->f_mode & FMODE_WRITE) == 0)
118 return 0;
119
120 /*
121 * If we're holding a write delegation, then check if we're required
122 * to flush the i/o on close. If not, then just start the i/o now.
123 */
124 if (!nfs4_delegation_flush_on_close(inode))
125 return filemap_fdatawrite(file->f_mapping);
126
127 /* Flush writes to the server and return any errors */
128 return vfs_fsync(file, 0);
129}
130
131#ifdef CONFIG_NFS_V4_2
132static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
133 struct file *file_out, loff_t pos_out,
134 size_t count, unsigned int flags)
135{
136 if (file_inode(file_in) == file_inode(file_out))
137 return -EINVAL;
138
139 return nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count);
140}
141
142static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
143{
144 loff_t ret;
145
146 switch (whence) {
147 case SEEK_HOLE:
148 case SEEK_DATA:
149 ret = nfs42_proc_llseek(filep, offset, whence);
150 if (ret != -ENOTSUPP)
151 return ret;
152 default:
153 return nfs_file_llseek(filep, offset, whence);
154 }
155}
156
157static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
158{
159 struct inode *inode = file_inode(filep);
160 long ret;
161
162 if (!S_ISREG(inode->i_mode))
163 return -EOPNOTSUPP;
164
165 if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
166 return -EOPNOTSUPP;
167
168 ret = inode_newsize_ok(inode, offset + len);
169 if (ret < 0)
170 return ret;
171
172 if (mode & FALLOC_FL_PUNCH_HOLE)
173 return nfs42_proc_deallocate(filep, offset, len);
174 return nfs42_proc_allocate(filep, offset, len);
175}
176
177static int nfs42_clone_file_range(struct file *src_file, loff_t src_off,
178 struct file *dst_file, loff_t dst_off, u64 count)
179{
180 struct inode *dst_inode = file_inode(dst_file);
181 struct nfs_server *server = NFS_SERVER(dst_inode);
182 struct inode *src_inode = file_inode(src_file);
183 unsigned int bs = server->clone_blksize;
184 bool same_inode = false;
185 int ret;
186
187 /* check alignment w.r.t. clone_blksize */
188 ret = -EINVAL;
189 if (bs) {
190 if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs))
191 goto out;
192 if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
193 goto out;
194 }
195
196 if (src_inode == dst_inode)
197 same_inode = true;
198
199 /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
200 if (same_inode) {
201 inode_lock(src_inode);
202 } else if (dst_inode < src_inode) {
203 inode_lock_nested(dst_inode, I_MUTEX_PARENT);
204 inode_lock_nested(src_inode, I_MUTEX_CHILD);
205 } else {
206 inode_lock_nested(src_inode, I_MUTEX_PARENT);
207 inode_lock_nested(dst_inode, I_MUTEX_CHILD);
208 }
209
210 /* flush all pending writes on both src and dst so that server
211 * has the latest data */
212 ret = nfs_sync_inode(src_inode);
213 if (ret)
214 goto out_unlock;
215 ret = nfs_sync_inode(dst_inode);
216 if (ret)
217 goto out_unlock;
218
219 ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
220
221 /* truncate inode page cache of the dst range so that future reads can fetch
222 * new data from server */
223 if (!ret)
224 truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);
225
226out_unlock:
227 if (same_inode) {
228 inode_unlock(src_inode);
229 } else if (dst_inode < src_inode) {
230 inode_unlock(src_inode);
231 inode_unlock(dst_inode);
232 } else {
233 inode_unlock(dst_inode);
234 inode_unlock(src_inode);
235 }
236out:
237 return ret;
238}
239#endif /* CONFIG_NFS_V4_2 */
240
241const struct file_operations nfs4_file_operations = {
242 .read_iter = nfs_file_read,
243 .write_iter = nfs_file_write,
244 .mmap = nfs_file_mmap,
245 .open = nfs4_file_open,
246 .flush = nfs4_file_flush,
247 .release = nfs_file_release,
248 .fsync = nfs_file_fsync,
249 .lock = nfs_lock,
250 .flock = nfs_flock,
251 .splice_read = generic_file_splice_read,
252 .splice_write = iter_file_splice_write,
253 .check_flags = nfs_check_flags,
254 .setlease = simple_nosetlease,
255#ifdef CONFIG_NFS_V4_2
256 .copy_file_range = nfs4_copy_file_range,
257 .llseek = nfs4_file_llseek,
258 .fallocate = nfs42_fallocate,
259 .clone_file_range = nfs42_clone_file_range,
260#else
261 .llseek = nfs_file_llseek,
262#endif
263};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/nfs/file.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 */
7#include <linux/fs.h>
8#include <linux/file.h>
9#include <linux/falloc.h>
10#include <linux/mount.h>
11#include <linux/nfs_fs.h>
12#include <linux/nfs_ssc.h>
13#include <linux/splice.h>
14#include "delegation.h"
15#include "internal.h"
16#include "iostat.h"
17#include "fscache.h"
18#include "pnfs.h"
19
20#include "nfstrace.h"
21
22#ifdef CONFIG_NFS_V4_2
23#include "nfs42.h"
24#endif
25
26#define NFSDBG_FACILITY NFSDBG_FILE
27
28static int
29nfs4_file_open(struct inode *inode, struct file *filp)
30{
31 struct nfs_open_context *ctx;
32 struct dentry *dentry = file_dentry(filp);
33 struct dentry *parent = NULL;
34 struct inode *dir;
35 unsigned openflags = filp->f_flags;
36 struct iattr attr;
37 int err;
38
39 /*
40 * If no cached dentry exists or if it's negative, NFSv4 handled the
41 * opens in ->lookup() or ->create().
42 *
43 * We only get this far for a cached positive dentry. We skipped
44 * revalidation, so handle it here by dropping the dentry and returning
45 * -EOPENSTALE. The VFS will retry the lookup/create/open.
46 */
47
48 dprintk("NFS: open file(%pd2)\n", dentry);
49
50 err = nfs_check_flags(openflags);
51 if (err)
52 return err;
53
54 /* We can't create new files here */
55 openflags &= ~(O_CREAT|O_EXCL);
56
57 parent = dget_parent(dentry);
58 dir = d_inode(parent);
59
60 ctx = alloc_nfs_open_context(file_dentry(filp),
61 flags_to_mode(openflags), filp);
62 err = PTR_ERR(ctx);
63 if (IS_ERR(ctx))
64 goto out;
65
66 attr.ia_valid = ATTR_OPEN;
67 if (openflags & O_TRUNC) {
68 attr.ia_valid |= ATTR_SIZE;
69 attr.ia_size = 0;
70 filemap_write_and_wait(inode->i_mapping);
71 }
72
73 inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
74 if (IS_ERR(inode)) {
75 err = PTR_ERR(inode);
76 switch (err) {
77 default:
78 goto out_put_ctx;
79 case -ENOENT:
80 case -ESTALE:
81 case -EISDIR:
82 case -ENOTDIR:
83 case -ELOOP:
84 goto out_drop;
85 }
86 }
87 if (inode != d_inode(dentry))
88 goto out_drop;
89
90 nfs_file_set_open_context(filp, ctx);
91 nfs_fscache_open_file(inode, filp);
92 err = 0;
93 filp->f_mode |= FMODE_CAN_ODIRECT;
94
95out_put_ctx:
96 put_nfs_open_context(ctx);
97out:
98 dput(parent);
99 return err;
100
101out_drop:
102 d_drop(dentry);
103 err = -EOPENSTALE;
104 goto out_put_ctx;
105}
106
107/*
108 * Flush all dirty pages, and check for write errors.
109 */
110static int
111nfs4_file_flush(struct file *file, fl_owner_t id)
112{
113 struct inode *inode = file_inode(file);
114 errseq_t since;
115
116 dprintk("NFS: flush(%pD2)\n", file);
117
118 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
119 if ((file->f_mode & FMODE_WRITE) == 0)
120 return 0;
121
122 /*
123 * If we're holding a write delegation, then check if we're required
124 * to flush the i/o on close. If not, then just start the i/o now.
125 */
126 if (!nfs4_delegation_flush_on_close(inode))
127 return filemap_fdatawrite(file->f_mapping);
128
129 /* Flush writes to the server and return any errors */
130 since = filemap_sample_wb_err(file->f_mapping);
131 nfs_wb_all(inode);
132 return filemap_check_wb_err(file->f_mapping, since);
133}
134
135#ifdef CONFIG_NFS_V4_2
136static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
137 struct file *file_out, loff_t pos_out,
138 size_t count, unsigned int flags)
139{
140 struct nfs42_copy_notify_res *cn_resp = NULL;
141 struct nl4_server *nss = NULL;
142 nfs4_stateid *cnrs = NULL;
143 ssize_t ret;
144 bool sync = false;
145
146 /* Only offload copy if superblock is the same */
147 if (file_in->f_op != &nfs4_file_operations)
148 return -EXDEV;
149 if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY) ||
150 !nfs_server_capable(file_inode(file_in), NFS_CAP_COPY))
151 return -EOPNOTSUPP;
152 if (file_inode(file_in) == file_inode(file_out))
153 return -EOPNOTSUPP;
154 /* if the copy size if smaller than 2 RPC payloads, make it
155 * synchronous
156 */
157 if (count <= 2 * NFS_SERVER(file_inode(file_in))->rsize)
158 sync = true;
159retry:
160 if (!nfs42_files_from_same_server(file_in, file_out)) {
161 /*
162 * for inter copy, if copy size is too small
163 * then fallback to generic copy.
164 */
165 if (sync)
166 return -EOPNOTSUPP;
167 cn_resp = kzalloc(sizeof(struct nfs42_copy_notify_res),
168 GFP_KERNEL);
169 if (unlikely(cn_resp == NULL))
170 return -ENOMEM;
171
172 ret = nfs42_proc_copy_notify(file_in, file_out, cn_resp);
173 if (ret) {
174 ret = -EOPNOTSUPP;
175 goto out;
176 }
177 nss = &cn_resp->cnr_src;
178 cnrs = &cn_resp->cnr_stateid;
179 }
180 ret = nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count,
181 nss, cnrs, sync);
182out:
183 kfree(cn_resp);
184
185 if (ret == -EAGAIN)
186 goto retry;
187 return ret;
188}
189
190static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
191 struct file *file_out, loff_t pos_out,
192 size_t count, unsigned int flags)
193{
194 ssize_t ret;
195
196 ret = __nfs4_copy_file_range(file_in, pos_in, file_out, pos_out, count,
197 flags);
198 if (ret == -EOPNOTSUPP || ret == -EXDEV)
199 ret = splice_copy_file_range(file_in, pos_in, file_out,
200 pos_out, count);
201 return ret;
202}
203
204static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
205{
206 loff_t ret;
207
208 switch (whence) {
209 case SEEK_HOLE:
210 case SEEK_DATA:
211 ret = nfs42_proc_llseek(filep, offset, whence);
212 if (ret != -EOPNOTSUPP)
213 return ret;
214 fallthrough;
215 default:
216 return nfs_file_llseek(filep, offset, whence);
217 }
218}
219
220static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
221{
222 struct inode *inode = file_inode(filep);
223 long ret;
224
225 if (!S_ISREG(inode->i_mode))
226 return -EOPNOTSUPP;
227
228 if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
229 return -EOPNOTSUPP;
230
231 ret = inode_newsize_ok(inode, offset + len);
232 if (ret < 0)
233 return ret;
234
235 if (mode & FALLOC_FL_PUNCH_HOLE)
236 return nfs42_proc_deallocate(filep, offset, len);
237 return nfs42_proc_allocate(filep, offset, len);
238}
239
240static loff_t nfs42_remap_file_range(struct file *src_file, loff_t src_off,
241 struct file *dst_file, loff_t dst_off, loff_t count,
242 unsigned int remap_flags)
243{
244 struct inode *dst_inode = file_inode(dst_file);
245 struct nfs_server *server = NFS_SERVER(dst_inode);
246 struct inode *src_inode = file_inode(src_file);
247 unsigned int bs = server->clone_blksize;
248 bool same_inode = false;
249 int ret;
250
251 /* NFS does not support deduplication. */
252 if (remap_flags & REMAP_FILE_DEDUP)
253 return -EOPNOTSUPP;
254
255 if (remap_flags & ~REMAP_FILE_ADVISORY)
256 return -EINVAL;
257
258 if (IS_SWAPFILE(dst_inode) || IS_SWAPFILE(src_inode))
259 return -ETXTBSY;
260
261 /* check alignment w.r.t. clone_blksize */
262 ret = -EINVAL;
263 if (bs) {
264 if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs))
265 goto out;
266 if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
267 goto out;
268 }
269
270 if (src_inode == dst_inode)
271 same_inode = true;
272
273 /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
274 if (same_inode) {
275 inode_lock(src_inode);
276 } else if (dst_inode < src_inode) {
277 inode_lock_nested(dst_inode, I_MUTEX_PARENT);
278 inode_lock_nested(src_inode, I_MUTEX_CHILD);
279 } else {
280 inode_lock_nested(src_inode, I_MUTEX_PARENT);
281 inode_lock_nested(dst_inode, I_MUTEX_CHILD);
282 }
283
284 /* flush all pending writes on both src and dst so that server
285 * has the latest data */
286 ret = nfs_sync_inode(src_inode);
287 if (ret)
288 goto out_unlock;
289 ret = nfs_sync_inode(dst_inode);
290 if (ret)
291 goto out_unlock;
292
293 ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
294
295 /* truncate inode page cache of the dst range so that future reads can fetch
296 * new data from server */
297 if (!ret)
298 truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);
299
300out_unlock:
301 if (same_inode) {
302 inode_unlock(src_inode);
303 } else if (dst_inode < src_inode) {
304 inode_unlock(src_inode);
305 inode_unlock(dst_inode);
306 } else {
307 inode_unlock(dst_inode);
308 inode_unlock(src_inode);
309 }
310out:
311 return ret < 0 ? ret : count;
312}
313
314static int read_name_gen = 1;
315#define SSC_READ_NAME_BODY "ssc_read_%d"
316
317static struct file *__nfs42_ssc_open(struct vfsmount *ss_mnt,
318 struct nfs_fh *src_fh, nfs4_stateid *stateid)
319{
320 struct nfs_fattr *fattr = nfs_alloc_fattr();
321 struct file *filep, *res;
322 struct nfs_server *server;
323 struct inode *r_ino = NULL;
324 struct nfs_open_context *ctx;
325 struct nfs4_state_owner *sp;
326 char *read_name = NULL;
327 int len, status = 0;
328
329 server = NFS_SB(ss_mnt->mnt_sb);
330
331 if (!fattr)
332 return ERR_PTR(-ENOMEM);
333
334 status = nfs4_proc_getattr(server, src_fh, fattr, NULL);
335 if (status < 0) {
336 res = ERR_PTR(status);
337 goto out;
338 }
339
340 if (!S_ISREG(fattr->mode)) {
341 res = ERR_PTR(-EBADF);
342 goto out;
343 }
344
345 res = ERR_PTR(-ENOMEM);
346 len = strlen(SSC_READ_NAME_BODY) + 16;
347 read_name = kzalloc(len, GFP_KERNEL);
348 if (read_name == NULL)
349 goto out;
350 snprintf(read_name, len, SSC_READ_NAME_BODY, read_name_gen++);
351
352 r_ino = nfs_fhget(ss_mnt->mnt_sb, src_fh, fattr);
353 if (IS_ERR(r_ino)) {
354 res = ERR_CAST(r_ino);
355 goto out_free_name;
356 }
357
358 filep = alloc_file_pseudo(r_ino, ss_mnt, read_name, O_RDONLY,
359 r_ino->i_fop);
360 if (IS_ERR(filep)) {
361 res = ERR_CAST(filep);
362 iput(r_ino);
363 goto out_free_name;
364 }
365
366 ctx = alloc_nfs_open_context(filep->f_path.dentry,
367 flags_to_mode(filep->f_flags), filep);
368 if (IS_ERR(ctx)) {
369 res = ERR_CAST(ctx);
370 goto out_filep;
371 }
372
373 res = ERR_PTR(-EINVAL);
374 sp = nfs4_get_state_owner(server, ctx->cred, GFP_KERNEL);
375 if (sp == NULL)
376 goto out_ctx;
377
378 ctx->state = nfs4_get_open_state(r_ino, sp);
379 if (ctx->state == NULL)
380 goto out_stateowner;
381
382 set_bit(NFS_SRV_SSC_COPY_STATE, &ctx->state->flags);
383 memcpy(&ctx->state->open_stateid.other, &stateid->other,
384 NFS4_STATEID_OTHER_SIZE);
385 update_open_stateid(ctx->state, stateid, NULL, filep->f_mode);
386 set_bit(NFS_OPEN_STATE, &ctx->state->flags);
387
388 nfs_file_set_open_context(filep, ctx);
389 put_nfs_open_context(ctx);
390
391 file_ra_state_init(&filep->f_ra, filep->f_mapping->host->i_mapping);
392 res = filep;
393out_free_name:
394 kfree(read_name);
395out:
396 nfs_free_fattr(fattr);
397 return res;
398out_stateowner:
399 nfs4_put_state_owner(sp);
400out_ctx:
401 put_nfs_open_context(ctx);
402out_filep:
403 fput(filep);
404 goto out_free_name;
405}
406
407static void __nfs42_ssc_close(struct file *filep)
408{
409 struct nfs_open_context *ctx = nfs_file_open_context(filep);
410
411 ctx->state->flags = 0;
412}
413
414static const struct nfs4_ssc_client_ops nfs4_ssc_clnt_ops_tbl = {
415 .sco_open = __nfs42_ssc_open,
416 .sco_close = __nfs42_ssc_close,
417};
418
419/**
420 * nfs42_ssc_register_ops - Wrapper to register NFS_V4 ops in nfs_common
421 *
422 * Return values:
423 * None
424 */
425void nfs42_ssc_register_ops(void)
426{
427 nfs42_ssc_register(&nfs4_ssc_clnt_ops_tbl);
428}
429
430/**
431 * nfs42_ssc_unregister_ops - wrapper to un-register NFS_V4 ops in nfs_common
432 *
433 * Return values:
434 * None.
435 */
436void nfs42_ssc_unregister_ops(void)
437{
438 nfs42_ssc_unregister(&nfs4_ssc_clnt_ops_tbl);
439}
440#endif /* CONFIG_NFS_V4_2 */
441
442static int nfs4_setlease(struct file *file, int arg, struct file_lease **lease,
443 void **priv)
444{
445 return nfs4_proc_setlease(file, arg, lease, priv);
446}
447
448const struct file_operations nfs4_file_operations = {
449 .read_iter = nfs_file_read,
450 .write_iter = nfs_file_write,
451 .mmap = nfs_file_mmap,
452 .open = nfs4_file_open,
453 .flush = nfs4_file_flush,
454 .release = nfs_file_release,
455 .fsync = nfs_file_fsync,
456 .lock = nfs_lock,
457 .flock = nfs_flock,
458 .splice_read = nfs_file_splice_read,
459 .splice_write = iter_file_splice_write,
460 .check_flags = nfs_check_flags,
461 .setlease = nfs4_setlease,
462#ifdef CONFIG_NFS_V4_2
463 .copy_file_range = nfs4_copy_file_range,
464 .llseek = nfs4_file_llseek,
465 .fallocate = nfs42_fallocate,
466 .remap_file_range = nfs42_remap_file_range,
467#else
468 .llseek = nfs_file_llseek,
469#endif
470};