Loading...
1/*
2 * linux/fs/nfs/file.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 */
6#include <linux/nfs_fs.h>
7#include "internal.h"
8#include "fscache.h"
9#include "pnfs.h"
10
11#define NFSDBG_FACILITY NFSDBG_FILE
12
13static int
14nfs4_file_open(struct inode *inode, struct file *filp)
15{
16 struct nfs_open_context *ctx;
17 struct dentry *dentry = filp->f_path.dentry;
18 struct dentry *parent = NULL;
19 struct inode *dir;
20 unsigned openflags = filp->f_flags;
21 struct iattr attr;
22 int opened = 0;
23 int err;
24
25 /*
26 * If no cached dentry exists or if it's negative, NFSv4 handled the
27 * opens in ->lookup() or ->create().
28 *
29 * We only get this far for a cached positive dentry. We skipped
30 * revalidation, so handle it here by dropping the dentry and returning
31 * -EOPENSTALE. The VFS will retry the lookup/create/open.
32 */
33
34 dprintk("NFS: open file(%pd2)\n", dentry);
35
36 if ((openflags & O_ACCMODE) == 3)
37 openflags--;
38
39 /* We can't create new files here */
40 openflags &= ~(O_CREAT|O_EXCL);
41
42 parent = dget_parent(dentry);
43 dir = parent->d_inode;
44
45 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
46 err = PTR_ERR(ctx);
47 if (IS_ERR(ctx))
48 goto out;
49
50 attr.ia_valid = ATTR_OPEN;
51 if (openflags & O_TRUNC) {
52 attr.ia_valid |= ATTR_SIZE;
53 attr.ia_size = 0;
54 nfs_wb_all(inode);
55 }
56
57 inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, &opened);
58 if (IS_ERR(inode)) {
59 err = PTR_ERR(inode);
60 switch (err) {
61 case -EPERM:
62 case -EACCES:
63 case -EDQUOT:
64 case -ENOSPC:
65 case -EROFS:
66 goto out_put_ctx;
67 default:
68 goto out_drop;
69 }
70 }
71 if (inode != dentry->d_inode)
72 goto out_drop;
73
74 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
75 nfs_file_set_open_context(filp, ctx);
76 nfs_fscache_open_file(inode, filp);
77 err = 0;
78
79out_put_ctx:
80 put_nfs_open_context(ctx);
81out:
82 dput(parent);
83 return err;
84
85out_drop:
86 d_drop(dentry);
87 err = -EOPENSTALE;
88 goto out_put_ctx;
89}
90
91static int
92nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
93{
94 int ret;
95 struct inode *inode = file_inode(file);
96
97 do {
98 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
99 if (ret != 0)
100 break;
101 mutex_lock(&inode->i_mutex);
102 ret = nfs_file_fsync_commit(file, start, end, datasync);
103 if (!ret && !datasync)
104 /* application has asked for meta-data sync */
105 ret = pnfs_layoutcommit_inode(inode, true);
106 mutex_unlock(&inode->i_mutex);
107 /*
108 * If nfs_file_fsync_commit detected a server reboot, then
109 * resend all dirty pages that might have been covered by
110 * the NFS_CONTEXT_RESEND_WRITES flag
111 */
112 start = 0;
113 end = LLONG_MAX;
114 } while (ret == -EAGAIN);
115
116 return ret;
117}
118
119const struct file_operations nfs4_file_operations = {
120 .llseek = nfs_file_llseek,
121 .read = do_sync_read,
122 .write = do_sync_write,
123 .aio_read = nfs_file_read,
124 .aio_write = nfs_file_write,
125 .mmap = nfs_file_mmap,
126 .open = nfs4_file_open,
127 .flush = nfs_file_flush,
128 .release = nfs_file_release,
129 .fsync = nfs4_file_fsync,
130 .lock = nfs_lock,
131 .flock = nfs_flock,
132 .splice_read = nfs_file_splice_read,
133 .splice_write = nfs_file_splice_write,
134 .check_flags = nfs_check_flags,
135 .setlease = nfs_setlease,
136};
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 "delegation.h"
13#include "internal.h"
14#include "iostat.h"
15#include "fscache.h"
16#include "pnfs.h"
17
18#include "nfstrace.h"
19
20#ifdef CONFIG_NFS_V4_2
21#include "nfs42.h"
22#endif
23
24#define NFSDBG_FACILITY NFSDBG_FILE
25
26static int
27nfs4_file_open(struct inode *inode, struct file *filp)
28{
29 struct nfs_open_context *ctx;
30 struct dentry *dentry = file_dentry(filp);
31 struct dentry *parent = NULL;
32 struct inode *dir;
33 unsigned openflags = filp->f_flags;
34 struct iattr attr;
35 int err;
36
37 /*
38 * If no cached dentry exists or if it's negative, NFSv4 handled the
39 * opens in ->lookup() or ->create().
40 *
41 * We only get this far for a cached positive dentry. We skipped
42 * revalidation, so handle it here by dropping the dentry and returning
43 * -EOPENSTALE. The VFS will retry the lookup/create/open.
44 */
45
46 dprintk("NFS: open file(%pd2)\n", dentry);
47
48 err = nfs_check_flags(openflags);
49 if (err)
50 return err;
51
52 if ((openflags & O_ACCMODE) == 3)
53 return nfs_open(inode, filp);
54
55 /* We can't create new files here */
56 openflags &= ~(O_CREAT|O_EXCL);
57
58 parent = dget_parent(dentry);
59 dir = d_inode(parent);
60
61 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, 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
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 errseq_t since;
114
115 dprintk("NFS: flush(%pD2)\n", file);
116
117 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
118 if ((file->f_mode & FMODE_WRITE) == 0)
119 return 0;
120
121 /*
122 * If we're holding a write delegation, then check if we're required
123 * to flush the i/o on close. If not, then just start the i/o now.
124 */
125 if (!nfs4_delegation_flush_on_close(inode))
126 return filemap_fdatawrite(file->f_mapping);
127
128 /* Flush writes to the server and return any errors */
129 since = filemap_sample_wb_err(file->f_mapping);
130 nfs_wb_all(inode);
131 return filemap_check_wb_err(file->f_mapping, since);
132}
133
134#ifdef CONFIG_NFS_V4_2
135static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
136 struct file *file_out, loff_t pos_out,
137 size_t count, unsigned int flags)
138{
139 struct nfs42_copy_notify_res *cn_resp = NULL;
140 struct nl4_server *nss = NULL;
141 nfs4_stateid *cnrs = NULL;
142 ssize_t ret;
143 bool sync = false;
144
145 /* Only offload copy if superblock is the same */
146 if (file_in->f_op != &nfs4_file_operations)
147 return -EXDEV;
148 if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY))
149 return -EOPNOTSUPP;
150 if (file_inode(file_in) == file_inode(file_out))
151 return -EOPNOTSUPP;
152 /* if the copy size if smaller than 2 RPC payloads, make it
153 * synchronous
154 */
155 if (count <= 2 * NFS_SERVER(file_inode(file_in))->rsize)
156 sync = true;
157retry:
158 if (!nfs42_files_from_same_server(file_in, file_out)) {
159 /* for inter copy, if copy size if smaller than 12 RPC
160 * payloads, fallback to traditional copy. There are
161 * 14 RPCs during an NFSv4.x mount between source/dest
162 * servers.
163 */
164 if (sync ||
165 count <= 14 * NFS_SERVER(file_inode(file_in))->rsize)
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 != -ENOTSUPP)
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
317struct file *
318nfs42_ssc_open(struct vfsmount *ss_mnt, struct nfs_fh *src_fh,
319 nfs4_stateid *stateid)
320{
321 struct nfs_fattr fattr;
322 struct file *filep, *res;
323 struct nfs_server *server;
324 struct inode *r_ino = NULL;
325 struct nfs_open_context *ctx;
326 struct nfs4_state_owner *sp;
327 char *read_name = NULL;
328 int len, status = 0;
329
330 server = NFS_SERVER(ss_mnt->mnt_root->d_inode);
331
332 nfs_fattr_init(&fattr);
333
334 status = nfs4_proc_getattr(server, src_fh, &fattr, NULL, NULL);
335 if (status < 0) {
336 res = ERR_PTR(status);
337 goto out;
338 }
339
340 res = ERR_PTR(-ENOMEM);
341 len = strlen(SSC_READ_NAME_BODY) + 16;
342 read_name = kzalloc(len, GFP_NOFS);
343 if (read_name == NULL)
344 goto out;
345 snprintf(read_name, len, SSC_READ_NAME_BODY, read_name_gen++);
346
347 r_ino = nfs_fhget(ss_mnt->mnt_root->d_inode->i_sb, src_fh, &fattr,
348 NULL);
349 if (IS_ERR(r_ino)) {
350 res = ERR_CAST(r_ino);
351 goto out_free_name;
352 }
353
354 filep = alloc_file_pseudo(r_ino, ss_mnt, read_name, FMODE_READ,
355 r_ino->i_fop);
356 if (IS_ERR(filep)) {
357 res = ERR_CAST(filep);
358 goto out_free_name;
359 }
360 filep->f_mode |= FMODE_READ;
361
362 ctx = alloc_nfs_open_context(filep->f_path.dentry, filep->f_mode,
363 filep);
364 if (IS_ERR(ctx)) {
365 res = ERR_CAST(ctx);
366 goto out_filep;
367 }
368
369 res = ERR_PTR(-EINVAL);
370 sp = nfs4_get_state_owner(server, ctx->cred, GFP_KERNEL);
371 if (sp == NULL)
372 goto out_ctx;
373
374 ctx->state = nfs4_get_open_state(r_ino, sp);
375 if (ctx->state == NULL)
376 goto out_stateowner;
377
378 set_bit(NFS_SRV_SSC_COPY_STATE, &ctx->state->flags);
379 set_bit(NFS_OPEN_STATE, &ctx->state->flags);
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);
383
384 nfs_file_set_open_context(filep, ctx);
385 put_nfs_open_context(ctx);
386
387 file_ra_state_init(&filep->f_ra, filep->f_mapping->host->i_mapping);
388 res = filep;
389out_free_name:
390 kfree(read_name);
391out:
392 return res;
393out_stateowner:
394 nfs4_put_state_owner(sp);
395out_ctx:
396 put_nfs_open_context(ctx);
397out_filep:
398 fput(filep);
399 goto out_free_name;
400}
401EXPORT_SYMBOL_GPL(nfs42_ssc_open);
402void nfs42_ssc_close(struct file *filep)
403{
404 struct nfs_open_context *ctx = nfs_file_open_context(filep);
405
406 ctx->state->flags = 0;
407}
408EXPORT_SYMBOL_GPL(nfs42_ssc_close);
409#endif /* CONFIG_NFS_V4_2 */
410
411const struct file_operations nfs4_file_operations = {
412 .read_iter = nfs_file_read,
413 .write_iter = nfs_file_write,
414 .mmap = nfs_file_mmap,
415 .open = nfs4_file_open,
416 .flush = nfs4_file_flush,
417 .release = nfs_file_release,
418 .fsync = nfs_file_fsync,
419 .lock = nfs_lock,
420 .flock = nfs_flock,
421 .splice_read = generic_file_splice_read,
422 .splice_write = iter_file_splice_write,
423 .check_flags = nfs_check_flags,
424 .setlease = simple_nosetlease,
425#ifdef CONFIG_NFS_V4_2
426 .copy_file_range = nfs4_copy_file_range,
427 .llseek = nfs4_file_llseek,
428 .fallocate = nfs42_fallocate,
429 .remap_file_range = nfs42_remap_file_range,
430#else
431 .llseek = nfs_file_llseek,
432#endif
433};