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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 "delegation.h"
14#include "internal.h"
15#include "iostat.h"
16#include "fscache.h"
17#include "pnfs.h"
18
19#include "nfstrace.h"
20
21#ifdef CONFIG_NFS_V4_2
22#include "nfs42.h"
23#endif
24
25#define NFSDBG_FACILITY NFSDBG_FILE
26
27static int
28nfs4_file_open(struct inode *inode, struct file *filp)
29{
30 struct nfs_open_context *ctx;
31 struct dentry *dentry = file_dentry(filp);
32 struct dentry *parent = NULL;
33 struct inode *dir;
34 unsigned openflags = filp->f_flags;
35 struct iattr attr;
36 int err;
37
38
39
40
41
42
43
44
45
46
47 dprintk("NFS: open file(%pd2)\n", dentry);
48
49 err = nfs_check_flags(openflags);
50 if (err)
51 return err;
52
53 if ((openflags & O_ACCMODE) == 3)
54 return nfs_open(inode, filp);
55
56
57 openflags &= ~(O_CREAT|O_EXCL);
58
59 parent = dget_parent(dentry);
60 dir = d_inode(parent);
61
62 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
63 err = PTR_ERR(ctx);
64 if (IS_ERR(ctx))
65 goto out;
66
67 attr.ia_valid = ATTR_OPEN;
68 if (openflags & O_TRUNC) {
69 attr.ia_valid |= ATTR_SIZE;
70 attr.ia_size = 0;
71 filemap_write_and_wait(inode->i_mapping);
72 }
73
74 inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
75 if (IS_ERR(inode)) {
76 err = PTR_ERR(inode);
77 switch (err) {
78 default:
79 goto out_put_ctx;
80 case -ENOENT:
81 case -ESTALE:
82 case -EISDIR:
83 case -ENOTDIR:
84 case -ELOOP:
85 goto out_drop;
86 }
87 }
88 if (inode != d_inode(dentry))
89 goto out_drop;
90
91 nfs_file_set_open_context(filp, ctx);
92 nfs_fscache_open_file(inode, filp);
93 err = 0;
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
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
124
125
126 if (!nfs4_delegation_flush_on_close(inode))
127 return filemap_fdatawrite(file->f_mapping);
128
129
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
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
155
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
163
164
165 if (sync)
166 return -EOPNOTSUPP;
167 cn_resp = kzalloc(sizeof(struct nfs42_copy_notify_res),
168 GFP_NOFS);
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 if (!nfs42_files_from_same_server(file_in, file_out))
184 kfree(cn_resp);
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 = generic_copy_file_range(file_in, pos_in, file_out,
200 pos_out, count, flags);
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
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
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
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
285
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
296
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;
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_SERVER(ss_mnt->mnt_root->d_inode);
330
331 nfs_fattr_init(&fattr);
332
333 status = nfs4_proc_getattr(server, src_fh, &fattr, NULL, NULL);
334 if (status < 0) {
335 res = ERR_PTR(status);
336 goto out;
337 }
338
339 res = ERR_PTR(-ENOMEM);
340 len = strlen(SSC_READ_NAME_BODY) + 16;
341 read_name = kzalloc(len, GFP_NOFS);
342 if (read_name == NULL)
343 goto out;
344 snprintf(read_name, len, SSC_READ_NAME_BODY, read_name_gen++);
345
346 r_ino = nfs_fhget(ss_mnt->mnt_root->d_inode->i_sb, src_fh, &fattr,
347 NULL);
348 if (IS_ERR(r_ino)) {
349 res = ERR_CAST(r_ino);
350 goto out_free_name;
351 }
352
353 filep = alloc_file_pseudo(r_ino, ss_mnt, read_name, FMODE_READ,
354 r_ino->i_fop);
355 if (IS_ERR(filep)) {
356 res = ERR_CAST(filep);
357 goto out_free_name;
358 }
359 filep->f_mode |= FMODE_READ;
360
361 ctx = alloc_nfs_open_context(filep->f_path.dentry, filep->f_mode,
362 filep);
363 if (IS_ERR(ctx)) {
364 res = ERR_CAST(ctx);
365 goto out_filep;
366 }
367
368 res = ERR_PTR(-EINVAL);
369 sp = nfs4_get_state_owner(server, ctx->cred, GFP_KERNEL);
370 if (sp == NULL)
371 goto out_ctx;
372
373 ctx->state = nfs4_get_open_state(r_ino, sp);
374 if (ctx->state == NULL)
375 goto out_stateowner;
376
377 set_bit(NFS_SRV_SSC_COPY_STATE, &ctx->state->flags);
378 memcpy(&ctx->state->open_stateid.other, &stateid->other,
379 NFS4_STATEID_OTHER_SIZE);
380 update_open_stateid(ctx->state, stateid, NULL, filep->f_mode);
381 set_bit(NFS_OPEN_STATE, &ctx->state->flags);
382
383 nfs_file_set_open_context(filep, ctx);
384 put_nfs_open_context(ctx);
385
386 file_ra_state_init(&filep->f_ra, filep->f_mapping->host->i_mapping);
387 res = filep;
388out_free_name:
389 kfree(read_name);
390out:
391 return res;
392out_stateowner:
393 nfs4_put_state_owner(sp);
394out_ctx:
395 put_nfs_open_context(ctx);
396out_filep:
397 fput(filep);
398 goto out_free_name;
399}
400
401static void __nfs42_ssc_close(struct file *filep)
402{
403 struct nfs_open_context *ctx = nfs_file_open_context(filep);
404
405 ctx->state->flags = 0;
406}
407
408static const struct nfs4_ssc_client_ops nfs4_ssc_clnt_ops_tbl = {
409 .sco_open = __nfs42_ssc_open,
410 .sco_close = __nfs42_ssc_close,
411};
412
413
414
415
416
417
418
419void nfs42_ssc_register_ops(void)
420{
421 nfs42_ssc_register(&nfs4_ssc_clnt_ops_tbl);
422}
423
424
425
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427
428
429
430void nfs42_ssc_unregister_ops(void)
431{
432 nfs42_ssc_unregister(&nfs4_ssc_clnt_ops_tbl);
433}
434#endif
435
436static int nfs4_setlease(struct file *file, long arg, struct file_lock **lease,
437 void **priv)
438{
439 return nfs4_proc_setlease(file, arg, lease, priv);
440}
441
442const struct file_operations nfs4_file_operations = {
443 .read_iter = nfs_file_read,
444 .write_iter = nfs_file_write,
445 .mmap = nfs_file_mmap,
446 .open = nfs4_file_open,
447 .flush = nfs4_file_flush,
448 .release = nfs_file_release,
449 .fsync = nfs_file_fsync,
450 .lock = nfs_lock,
451 .flock = nfs_flock,
452 .splice_read = generic_file_splice_read,
453 .splice_write = iter_file_splice_write,
454 .check_flags = nfs_check_flags,
455 .setlease = nfs4_setlease,
456#ifdef CONFIG_NFS_V4_2
457 .copy_file_range = nfs4_copy_file_range,
458 .llseek = nfs4_file_llseek,
459 .fallocate = nfs42_fallocate,
460 .remap_file_range = nfs42_remap_file_range,
461#else
462 .llseek = nfs_file_llseek,
463#endif
464};
465
