~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/nfs/nfs4file.c

Version: ~ [ linux-5.16-rc3 ] ~ [ linux-5.15.5 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.82 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.162 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.218 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.256 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.291 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.293 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 "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 
 27 static int
 28 nfs4_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          * 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 
 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         /* We can't create new files here */
 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 
 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 
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);
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
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)
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;
159 retry:
160         if (!nfs42_files_from_same_server(file_in, file_out)) {
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;
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                 }
179                 nss = &cn_resp->cnr_src;
180                 cnrs = &cn_resp->cnr_stateid;
181         }
182         ret = nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count,
183                                 nss, cnrs, sync);
184 out:
185         if (!nfs42_files_from_same_server(file_in, file_out))
186                 kfree(cn_resp);
187         if (ret == -EAGAIN)
188                 goto retry;
189         return ret;
190 }
191 
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);
200         if (ret == -EOPNOTSUPP || ret == -EXDEV)
201                 ret = generic_copy_file_range(file_in, pos_in, file_out,
202                                               pos_out, count, flags);
203         return ret;
204 }
205 
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);
214                 if (ret != -ENOTSUPP)
215                         return ret;
216                 fallthrough;
217         default:
218                 return nfs_file_llseek(filep, offset, whence);
219         }
220 }
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 
230         if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
231                 return -EOPNOTSUPP;
232 
233         ret = inode_newsize_ok(inode, offset + len);
234         if (ret < 0)
235                 return ret;
236 
237         if (mode & FALLOC_FL_PUNCH_HOLE)
238                 return nfs42_proc_deallocate(filep, offset, len);
239         return nfs42_proc_allocate(filep, offset, len);
240 }
241 
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,
244                 unsigned int remap_flags)
245 {
246         struct inode *dst_inode = file_inode(dst_file);
247         struct nfs_server *server = NFS_SERVER(dst_inode);
248         struct inode *src_inode = file_inode(src_file);
249         unsigned int bs = server->clone_blksize;
250         bool same_inode = false;
251         int ret;
252 
253         /* NFS does not support deduplication. */
254         if (remap_flags & REMAP_FILE_DEDUP)
255                 return -EOPNOTSUPP;
256 
257         if (remap_flags & ~REMAP_FILE_ADVISORY)
258                 return -EINVAL;
259 
260         if (IS_SWAPFILE(dst_inode) || IS_SWAPFILE(src_inode))
261                 return -ETXTBSY;
262 
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))
267                         goto out;
268                 if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
269                         goto out;
270         }
271 
272         if (src_inode == dst_inode)
273                 same_inode = true;
274 
275         /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
276         if (same_inode) {
277                 inode_lock(src_inode);
278         } else if (dst_inode < src_inode) {
279                 inode_lock_nested(dst_inode, I_MUTEX_PARENT);
280                 inode_lock_nested(src_inode, I_MUTEX_CHILD);
281         } else {
282                 inode_lock_nested(src_inode, I_MUTEX_PARENT);
283                 inode_lock_nested(dst_inode, I_MUTEX_CHILD);
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 
295         ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
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:
303         if (same_inode) {
304                 inode_unlock(src_inode);
305         } else if (dst_inode < src_inode) {
306                 inode_unlock(src_inode);
307                 inode_unlock(dst_inode);
308         } else {
309                 inode_unlock(dst_inode);
310                 inode_unlock(src_inode);
311         }
312 out:
313         return ret < 0 ? ret : count;
314 }
315 
316 static int read_name_gen = 1;
317 #define SSC_READ_NAME_BODY "ssc_read_%d"
318 
319 static struct file *__nfs42_ssc_open(struct vfsmount *ss_mnt,
320                 struct nfs_fh *src_fh, nfs4_stateid *stateid)
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;
328         char *read_name = NULL;
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);
352                 goto out_free_name;
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);
359                 goto out_free_name;
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 
379         set_bit(NFS_SRV_SSC_COPY_STATE, &ctx->state->flags);
380         set_bit(NFS_OPEN_STATE, &ctx->state->flags);
381         memcpy(&ctx->state->open_stateid.other, &stateid->other,
382                NFS4_STATEID_OTHER_SIZE);
383         update_open_stateid(ctx->state, stateid, NULL, filep->f_mode);
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;
390 out_free_name:
391         kfree(read_name);
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);
400         goto out_free_name;
401 }
402 
403 static void __nfs42_ssc_close(struct file *filep)
404 {
405         struct nfs_open_context *ctx = nfs_file_open_context(filep);
406 
407         ctx->state->flags = 0;
408 }
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 }
436 #endif /* CONFIG_NFS_V4_2 */
437 
438 const struct file_operations nfs4_file_operations = {
439         .read_iter      = nfs_file_read,
440         .write_iter     = nfs_file_write,
441         .mmap           = nfs_file_mmap,
442         .open           = nfs4_file_open,
443         .flush          = nfs4_file_flush,
444         .release        = nfs_file_release,
445         .fsync          = nfs_file_fsync,
446         .lock           = nfs_lock,
447         .flock          = nfs_flock,
448         .splice_read    = generic_file_splice_read,
449         .splice_write   = iter_file_splice_write,
450         .check_flags    = nfs_check_flags,
451         .setlease       = simple_nosetlease,
452 #ifdef CONFIG_NFS_V4_2
453         .copy_file_range = nfs4_copy_file_range,
454         .llseek         = nfs4_file_llseek,
455         .fallocate      = nfs42_fallocate,
456         .remap_file_range = nfs42_remap_file_range,
457 #else
458         .llseek         = nfs_file_llseek,
459 #endif
460 };
461 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp