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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ce4ef7c0 BS |
2 | /* |
3 | * linux/fs/nfs/file.c | |
4 | * | |
5 | * Copyright (C) 1992 Rick Sladkey | |
6 | */ | |
f4ac1674 | 7 | #include <linux/fs.h> |
bea51b30 | 8 | #include <linux/file.h> |
f4ac1674 | 9 | #include <linux/falloc.h> |
f2aedb71 | 10 | #include <linux/mount.h> |
ce4ef7c0 | 11 | #include <linux/nfs_fs.h> |
0cfcd405 | 12 | #include <linux/nfs_ssc.h> |
5445b1fb | 13 | #include "delegation.h" |
ce4ef7c0 | 14 | #include "internal.h" |
5445b1fb | 15 | #include "iostat.h" |
a4ff1468 | 16 | #include "fscache.h" |
ce4ef7c0 BS |
17 | #include "pnfs.h" |
18 | ||
81b79afb TM |
19 | #include "nfstrace.h" |
20 | ||
1c6dcbe5 AS |
21 | #ifdef CONFIG_NFS_V4_2 |
22 | #include "nfs42.h" | |
23 | #endif | |
24 | ||
ce4ef7c0 BS |
25 | #define NFSDBG_FACILITY NFSDBG_FILE |
26 | ||
27 | static int | |
28 | nfs4_file_open(struct inode *inode, struct file *filp) | |
29 | { | |
30 | struct nfs_open_context *ctx; | |
be62a1a8 | 31 | struct dentry *dentry = file_dentry(filp); |
ce4ef7c0 BS |
32 | struct dentry *parent = NULL; |
33 | struct inode *dir; | |
34 | unsigned openflags = filp->f_flags; | |
35 | struct iattr attr; | |
36 | int err; | |
37 | ||
ce4ef7c0 BS |
38 | /* |
39 | * If no cached dentry exists or if it's negative, NFSv4 handled the | |
40 | * opens in ->lookup() or ->create(). | |
41 | * | |
42 | * We only get this far for a cached positive dentry. We skipped | |
43 | * revalidation, so handle it here by dropping the dentry and returning | |
44 | * -EOPENSTALE. The VFS will retry the lookup/create/open. | |
45 | */ | |
46 | ||
6de1472f | 47 | dprintk("NFS: open file(%pd2)\n", dentry); |
ce4ef7c0 | 48 | |
18a60089 BC |
49 | err = nfs_check_flags(openflags); |
50 | if (err) | |
51 | return err; | |
52 | ||
ce4ef7c0 | 53 | if ((openflags & O_ACCMODE) == 3) |
44942b4e | 54 | return nfs_open(inode, filp); |
ce4ef7c0 BS |
55 | |
56 | /* We can't create new files here */ | |
57 | openflags &= ~(O_CREAT|O_EXCL); | |
58 | ||
59 | parent = dget_parent(dentry); | |
2b0143b5 | 60 | dir = d_inode(parent); |
ce4ef7c0 | 61 | |
532d4def | 62 | ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp); |
ce4ef7c0 BS |
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; | |
8b7d9d09 | 71 | filemap_write_and_wait(inode->i_mapping); |
ce4ef7c0 BS |
72 | } |
73 | ||
c5c3fb5f | 74 | inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL); |
ce4ef7c0 BS |
75 | if (IS_ERR(inode)) { |
76 | err = PTR_ERR(inode); | |
77 | switch (err) { | |
ce4ef7c0 | 78 | default: |
90cf500e TM |
79 | goto out_put_ctx; |
80 | case -ENOENT: | |
81 | case -ESTALE: | |
82 | case -EISDIR: | |
83 | case -ENOTDIR: | |
84 | case -ELOOP: | |
ce4ef7c0 BS |
85 | goto out_drop; |
86 | } | |
87 | } | |
2b0143b5 | 88 | if (inode != d_inode(dentry)) |
ce4ef7c0 BS |
89 | goto out_drop; |
90 | ||
ce4ef7c0 | 91 | nfs_file_set_open_context(filp, ctx); |
f1fe29b4 | 92 | nfs_fscache_open_file(inode, filp); |
ce4ef7c0 BS |
93 | err = 0; |
94 | ||
95 | out_put_ctx: | |
96 | put_nfs_open_context(ctx); | |
97 | out: | |
98 | dput(parent); | |
99 | return err; | |
100 | ||
101 | out_drop: | |
102 | d_drop(dentry); | |
103 | err = -EOPENSTALE; | |
104 | goto out_put_ctx; | |
105 | } | |
106 | ||
5445b1fb TM |
107 | /* |
108 | * Flush all dirty pages, and check for write errors. | |
109 | */ | |
110 | static int | |
111 | nfs4_file_flush(struct file *file, fl_owner_t id) | |
112 | { | |
113 | struct inode *inode = file_inode(file); | |
67dd23f9 | 114 | errseq_t since; |
5445b1fb TM |
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 */ | |
67dd23f9 SM |
130 | since = filemap_sample_wb_err(file->f_mapping); |
131 | nfs_wb_all(inode); | |
132 | return filemap_check_wb_err(file->f_mapping, since); | |
5445b1fb TM |
133 | } |
134 | ||
1c6dcbe5 | 135 | #ifdef CONFIG_NFS_V4_2 |
64bf5ff5 DC |
136 | static 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) | |
2e72448b | 139 | { |
0491567b | 140 | struct nfs42_copy_notify_res *cn_resp = NULL; |
1d38f3f0 OK |
141 | struct nl4_server *nss = NULL; |
142 | nfs4_stateid *cnrs = NULL; | |
0491567b | 143 | ssize_t ret; |
12751010 | 144 | bool sync = false; |
0491567b | 145 | |
5dae222a | 146 | /* Only offload copy if superblock is the same */ |
8dff1df5 | 147 | if (file_in->f_op != &nfs4_file_operations) |
5dae222a | 148 | return -EXDEV; |
d8a6ad91 DW |
149 | if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY) || |
150 | !nfs_server_capable(file_inode(file_in), NFS_CAP_COPY)) | |
0769663b | 151 | return -EOPNOTSUPP; |
837bb1d7 | 152 | if (file_inode(file_in) == file_inode(file_out)) |
0769663b | 153 | return -EOPNOTSUPP; |
12751010 OK |
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; | |
0e65a32c | 159 | retry: |
0491567b | 160 | if (!nfs42_files_from_same_server(file_in, file_out)) { |
12751010 OK |
161 | /* for inter copy, if copy size if smaller than 12 RPC |
162 | * payloads, fallback to traditional copy. There are | |
163 | * 14 RPCs during an NFSv4.x mount between source/dest | |
164 | * servers. | |
165 | */ | |
166 | if (sync || | |
167 | count <= 14 * NFS_SERVER(file_inode(file_in))->rsize) | |
168 | return -EOPNOTSUPP; | |
0491567b OK |
169 | cn_resp = kzalloc(sizeof(struct nfs42_copy_notify_res), |
170 | GFP_NOFS); | |
171 | if (unlikely(cn_resp == NULL)) | |
172 | return -ENOMEM; | |
173 | ||
174 | ret = nfs42_proc_copy_notify(file_in, file_out, cn_resp); | |
175 | if (ret) { | |
176 | ret = -EOPNOTSUPP; | |
177 | goto out; | |
178 | } | |
1d38f3f0 OK |
179 | nss = &cn_resp->cnr_src; |
180 | cnrs = &cn_resp->cnr_stateid; | |
0491567b | 181 | } |
1d38f3f0 | 182 | ret = nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count, |
12751010 | 183 | nss, cnrs, sync); |
0491567b | 184 | out: |
66588abe OK |
185 | if (!nfs42_files_from_same_server(file_in, file_out)) |
186 | kfree(cn_resp); | |
0e65a32c OK |
187 | if (ret == -EAGAIN) |
188 | goto retry; | |
0491567b | 189 | return ret; |
2e72448b AS |
190 | } |
191 | ||
64bf5ff5 DC |
192 | static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in, |
193 | struct file *file_out, loff_t pos_out, | |
194 | size_t count, unsigned int flags) | |
195 | { | |
196 | ssize_t ret; | |
197 | ||
198 | ret = __nfs4_copy_file_range(file_in, pos_in, file_out, pos_out, count, | |
199 | flags); | |
5dae222a | 200 | if (ret == -EOPNOTSUPP || ret == -EXDEV) |
64bf5ff5 DC |
201 | ret = generic_copy_file_range(file_in, pos_in, file_out, |
202 | pos_out, count, flags); | |
203 | return ret; | |
204 | } | |
205 | ||
1c6dcbe5 AS |
206 | static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence) |
207 | { | |
208 | loff_t ret; | |
209 | ||
210 | switch (whence) { | |
211 | case SEEK_HOLE: | |
212 | case SEEK_DATA: | |
213 | ret = nfs42_proc_llseek(filep, offset, whence); | |
e67afa7e | 214 | if (ret != -EOPNOTSUPP) |
1c6dcbe5 | 215 | return ret; |
df561f66 | 216 | fallthrough; |
1c6dcbe5 AS |
217 | default: |
218 | return nfs_file_llseek(filep, offset, whence); | |
219 | } | |
220 | } | |
f4ac1674 AS |
221 | |
222 | static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len) | |
223 | { | |
224 | struct inode *inode = file_inode(filep); | |
225 | long ret; | |
226 | ||
227 | if (!S_ISREG(inode->i_mode)) | |
228 | return -EOPNOTSUPP; | |
229 | ||
624bd5b7 | 230 | if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))) |
f4ac1674 AS |
231 | return -EOPNOTSUPP; |
232 | ||
233 | ret = inode_newsize_ok(inode, offset + len); | |
234 | if (ret < 0) | |
235 | return ret; | |
236 | ||
624bd5b7 | 237 | if (mode & FALLOC_FL_PUNCH_HOLE) |
f830f7dd AS |
238 | return nfs42_proc_deallocate(filep, offset, len); |
239 | return nfs42_proc_allocate(filep, offset, len); | |
f4ac1674 | 240 | } |
bea51b30 | 241 | |
42ec3d4c DW |
242 | static loff_t nfs42_remap_file_range(struct file *src_file, loff_t src_off, |
243 | struct file *dst_file, loff_t dst_off, loff_t count, | |
2e5dfc99 | 244 | unsigned int remap_flags) |
bea51b30 PT |
245 | { |
246 | struct inode *dst_inode = file_inode(dst_file); | |
811b7b85 | 247 | struct nfs_server *server = NFS_SERVER(dst_inode); |
04b38d60 | 248 | struct inode *src_inode = file_inode(src_file); |
811b7b85 | 249 | unsigned int bs = server->clone_blksize; |
21fad313 | 250 | bool same_inode = false; |
bea51b30 PT |
251 | int ret; |
252 | ||
9026b3a9 DW |
253 | /* NFS does not support deduplication. */ |
254 | if (remap_flags & REMAP_FILE_DEDUP) | |
255 | return -EOPNOTSUPP; | |
256 | ||
257 | if (remap_flags & ~REMAP_FILE_ADVISORY) | |
2e5dfc99 DW |
258 | return -EINVAL; |
259 | ||
f5fdf124 MZ |
260 | if (IS_SWAPFILE(dst_inode) || IS_SWAPFILE(src_inode)) |
261 | return -ETXTBSY; | |
262 | ||
811b7b85 PT |
263 | /* check alignment w.r.t. clone_blksize */ |
264 | ret = -EINVAL; | |
265 | if (bs) { | |
266 | if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs)) | |
04b38d60 | 267 | goto out; |
811b7b85 | 268 | if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count)) |
04b38d60 | 269 | goto out; |
811b7b85 PT |
270 | } |
271 | ||
04b38d60 CH |
272 | if (src_inode == dst_inode) |
273 | same_inode = true; | |
21fad313 | 274 | |
bea51b30 | 275 | /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */ |
21fad313 | 276 | if (same_inode) { |
5955102c | 277 | inode_lock(src_inode); |
21fad313 | 278 | } else if (dst_inode < src_inode) { |
5955102c AV |
279 | inode_lock_nested(dst_inode, I_MUTEX_PARENT); |
280 | inode_lock_nested(src_inode, I_MUTEX_CHILD); | |
bea51b30 | 281 | } else { |
5955102c AV |
282 | inode_lock_nested(src_inode, I_MUTEX_PARENT); |
283 | inode_lock_nested(dst_inode, I_MUTEX_CHILD); | |
bea51b30 PT |
284 | } |
285 | ||
286 | /* flush all pending writes on both src and dst so that server | |
287 | * has the latest data */ | |
288 | ret = nfs_sync_inode(src_inode); | |
289 | if (ret) | |
290 | goto out_unlock; | |
291 | ret = nfs_sync_inode(dst_inode); | |
292 | if (ret) | |
293 | goto out_unlock; | |
294 | ||
04b38d60 | 295 | ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count); |
bea51b30 PT |
296 | |
297 | /* truncate inode page cache of the dst range so that future reads can fetch | |
298 | * new data from server */ | |
299 | if (!ret) | |
300 | truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1); | |
301 | ||
302 | out_unlock: | |
21fad313 | 303 | if (same_inode) { |
5955102c | 304 | inode_unlock(src_inode); |
21fad313 | 305 | } else if (dst_inode < src_inode) { |
5955102c AV |
306 | inode_unlock(src_inode); |
307 | inode_unlock(dst_inode); | |
bea51b30 | 308 | } else { |
5955102c AV |
309 | inode_unlock(dst_inode); |
310 | inode_unlock(src_inode); | |
bea51b30 | 311 | } |
04b38d60 | 312 | out: |
42ec3d4c | 313 | return ret < 0 ? ret : count; |
bea51b30 | 314 | } |
ec4b0925 OK |
315 | |
316 | static int read_name_gen = 1; | |
317 | #define SSC_READ_NAME_BODY "ssc_read_%d" | |
318 | ||
0cfcd405 DN |
319 | static struct file *__nfs42_ssc_open(struct vfsmount *ss_mnt, |
320 | struct nfs_fh *src_fh, nfs4_stateid *stateid) | |
ec4b0925 OK |
321 | { |
322 | struct nfs_fattr fattr; | |
323 | struct file *filep, *res; | |
324 | struct nfs_server *server; | |
325 | struct inode *r_ino = NULL; | |
326 | struct nfs_open_context *ctx; | |
327 | struct nfs4_state_owner *sp; | |
f751c545 | 328 | char *read_name = NULL; |
ec4b0925 OK |
329 | int len, status = 0; |
330 | ||
331 | server = NFS_SERVER(ss_mnt->mnt_root->d_inode); | |
332 | ||
333 | nfs_fattr_init(&fattr); | |
334 | ||
335 | status = nfs4_proc_getattr(server, src_fh, &fattr, NULL, NULL); | |
336 | if (status < 0) { | |
337 | res = ERR_PTR(status); | |
338 | goto out; | |
339 | } | |
340 | ||
341 | res = ERR_PTR(-ENOMEM); | |
342 | len = strlen(SSC_READ_NAME_BODY) + 16; | |
343 | read_name = kzalloc(len, GFP_NOFS); | |
344 | if (read_name == NULL) | |
345 | goto out; | |
346 | snprintf(read_name, len, SSC_READ_NAME_BODY, read_name_gen++); | |
347 | ||
348 | r_ino = nfs_fhget(ss_mnt->mnt_root->d_inode->i_sb, src_fh, &fattr, | |
349 | NULL); | |
350 | if (IS_ERR(r_ino)) { | |
351 | res = ERR_CAST(r_ino); | |
f751c545 | 352 | goto out_free_name; |
ec4b0925 OK |
353 | } |
354 | ||
355 | filep = alloc_file_pseudo(r_ino, ss_mnt, read_name, FMODE_READ, | |
356 | r_ino->i_fop); | |
357 | if (IS_ERR(filep)) { | |
358 | res = ERR_CAST(filep); | |
f751c545 | 359 | goto out_free_name; |
ec4b0925 OK |
360 | } |
361 | filep->f_mode |= FMODE_READ; | |
362 | ||
363 | ctx = alloc_nfs_open_context(filep->f_path.dentry, filep->f_mode, | |
364 | filep); | |
365 | if (IS_ERR(ctx)) { | |
366 | res = ERR_CAST(ctx); | |
367 | goto out_filep; | |
368 | } | |
369 | ||
370 | res = ERR_PTR(-EINVAL); | |
371 | sp = nfs4_get_state_owner(server, ctx->cred, GFP_KERNEL); | |
372 | if (sp == NULL) | |
373 | goto out_ctx; | |
374 | ||
375 | ctx->state = nfs4_get_open_state(r_ino, sp); | |
376 | if (ctx->state == NULL) | |
377 | goto out_stateowner; | |
378 | ||
0b9018b9 | 379 | set_bit(NFS_SRV_SSC_COPY_STATE, &ctx->state->flags); |
ec4b0925 OK |
380 | memcpy(&ctx->state->open_stateid.other, &stateid->other, |
381 | NFS4_STATEID_OTHER_SIZE); | |
382 | update_open_stateid(ctx->state, stateid, NULL, filep->f_mode); | |
fe8eb820 | 383 | set_bit(NFS_OPEN_STATE, &ctx->state->flags); |
ec4b0925 OK |
384 | |
385 | nfs_file_set_open_context(filep, ctx); | |
386 | put_nfs_open_context(ctx); | |
387 | ||
388 | file_ra_state_init(&filep->f_ra, filep->f_mapping->host->i_mapping); | |
389 | res = filep; | |
f751c545 OK |
390 | out_free_name: |
391 | kfree(read_name); | |
ec4b0925 OK |
392 | out: |
393 | return res; | |
394 | out_stateowner: | |
395 | nfs4_put_state_owner(sp); | |
396 | out_ctx: | |
397 | put_nfs_open_context(ctx); | |
398 | out_filep: | |
399 | fput(filep); | |
f751c545 | 400 | goto out_free_name; |
ec4b0925 | 401 | } |
0cfcd405 DN |
402 | |
403 | static void __nfs42_ssc_close(struct file *filep) | |
ec4b0925 OK |
404 | { |
405 | struct nfs_open_context *ctx = nfs_file_open_context(filep); | |
406 | ||
407 | ctx->state->flags = 0; | |
408 | } | |
0cfcd405 DN |
409 | |
410 | static const struct nfs4_ssc_client_ops nfs4_ssc_clnt_ops_tbl = { | |
411 | .sco_open = __nfs42_ssc_open, | |
412 | .sco_close = __nfs42_ssc_close, | |
413 | }; | |
414 | ||
415 | /** | |
416 | * nfs42_ssc_register_ops - Wrapper to register NFS_V4 ops in nfs_common | |
417 | * | |
418 | * Return values: | |
419 | * None | |
420 | */ | |
421 | void nfs42_ssc_register_ops(void) | |
422 | { | |
423 | nfs42_ssc_register(&nfs4_ssc_clnt_ops_tbl); | |
424 | } | |
425 | ||
426 | /** | |
427 | * nfs42_ssc_unregister_ops - wrapper to un-register NFS_V4 ops in nfs_common | |
428 | * | |
429 | * Return values: | |
430 | * None. | |
431 | */ | |
432 | void nfs42_ssc_unregister_ops(void) | |
433 | { | |
434 | nfs42_ssc_unregister(&nfs4_ssc_clnt_ops_tbl); | |
435 | } | |
6b7153da | 436 | #endif /* CONFIG_NFS_V4_2 */ |
bea51b30 | 437 | |
ce4ef7c0 | 438 | const struct file_operations nfs4_file_operations = { |
3aa2d199 | 439 | .read_iter = nfs_file_read, |
edaf4369 | 440 | .write_iter = nfs_file_write, |
ce4ef7c0 BS |
441 | .mmap = nfs_file_mmap, |
442 | .open = nfs4_file_open, | |
5445b1fb | 443 | .flush = nfs4_file_flush, |
ce4ef7c0 | 444 | .release = nfs_file_release, |
4ff79bc7 | 445 | .fsync = nfs_file_fsync, |
ce4ef7c0 BS |
446 | .lock = nfs_lock, |
447 | .flock = nfs_flock, | |
82c156f8 | 448 | .splice_read = generic_file_splice_read, |
4da54c21 | 449 | .splice_write = iter_file_splice_write, |
ce4ef7c0 | 450 | .check_flags = nfs_check_flags, |
1c994a09 | 451 | .setlease = simple_nosetlease, |
6b7153da | 452 | #ifdef CONFIG_NFS_V4_2 |
2e72448b | 453 | .copy_file_range = nfs4_copy_file_range, |
6b7153da CH |
454 | .llseek = nfs4_file_llseek, |
455 | .fallocate = nfs42_fallocate, | |
2e5dfc99 | 456 | .remap_file_range = nfs42_remap_file_range, |
6b7153da CH |
457 | #else |
458 | .llseek = nfs_file_llseek, | |
459 | #endif | |
ce4ef7c0 | 460 | }; |