1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 1992 Rick Sladkey
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"
21 #ifdef CONFIG_NFS_V4_2
25 #define NFSDBG_FACILITY NFSDBG_FILE
28 nfs4_file_open(struct inode *inode, struct file *filp)
30 struct nfs_open_context *ctx;
31 struct dentry *dentry = file_dentry(filp);
32 struct dentry *parent = NULL;
34 unsigned openflags = filp->f_flags;
39 * If no cached dentry exists or if it's negative, NFSv4 handled the
40 * opens in ->lookup() or ->create().
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.
47 dprintk("NFS: open file(%pd2)\n", dentry);
49 err = nfs_check_flags(openflags);
53 if ((openflags & O_ACCMODE) == 3)
54 return nfs_open(inode, filp);
56 /* We can't create new files here */
57 openflags &= ~(O_CREAT|O_EXCL);
59 parent = dget_parent(dentry);
60 dir = d_inode(parent);
62 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
67 attr.ia_valid = ATTR_OPEN;
68 if (openflags & O_TRUNC) {
69 attr.ia_valid |= ATTR_SIZE;
71 filemap_write_and_wait(inode->i_mapping);
74 inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
88 if (inode != d_inode(dentry))
91 nfs_file_set_open_context(filp, ctx);
92 nfs_fscache_open_file(inode, filp);
96 put_nfs_open_context(ctx);
108 * Flush all dirty pages, and check for write errors.
111 nfs4_file_flush(struct file *file, fl_owner_t id)
113 struct inode *inode = file_inode(file);
116 dprintk("NFS: flush(%pD2)\n", file);
118 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
119 if ((file->f_mode & FMODE_WRITE) == 0)
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.
126 if (!nfs4_delegation_flush_on_close(inode))
127 return filemap_fdatawrite(file->f_mapping);
129 /* Flush writes to the server and return any errors */
130 since = filemap_sample_wb_err(file->f_mapping);
132 return filemap_check_wb_err(file->f_mapping, since);
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)
140 struct nfs42_copy_notify_res *cn_resp = NULL;
141 struct nl4_server *nss = NULL;
142 nfs4_stateid *cnrs = NULL;
146 /* Only offload copy if superblock is the same */
147 if (file_in->f_op != &nfs4_file_operations)
149 if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY) ||
150 !nfs_server_capable(file_inode(file_in), NFS_CAP_COPY))
152 if (file_inode(file_in) == file_inode(file_out))
154 /* if the copy size if smaller than 2 RPC payloads, make it
157 if (count <= 2 * NFS_SERVER(file_inode(file_in))->rsize)
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
167 count <= 14 * NFS_SERVER(file_inode(file_in))->rsize)
169 cn_resp = kzalloc(sizeof(struct nfs42_copy_notify_res),
171 if (unlikely(cn_resp == NULL))
174 ret = nfs42_proc_copy_notify(file_in, file_out, cn_resp);
179 nss = &cn_resp->cnr_src;
180 cnrs = &cn_resp->cnr_stateid;
182 ret = nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count,
185 if (!nfs42_files_from_same_server(file_in, file_out))
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)
198 ret = __nfs4_copy_file_range(file_in, pos_in, file_out, pos_out, count,
200 if (ret == -EOPNOTSUPP || ret == -EXDEV)
201 ret = generic_copy_file_range(file_in, pos_in, file_out,
202 pos_out, count, flags);
206 static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
213 ret = nfs42_proc_llseek(filep, offset, whence);
214 if (ret != -EOPNOTSUPP)
218 return nfs_file_llseek(filep, offset, whence);
222 static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
224 struct inode *inode = file_inode(filep);
227 if (!S_ISREG(inode->i_mode))
230 if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
233 ret = inode_newsize_ok(inode, offset + len);
237 if (mode & FALLOC_FL_PUNCH_HOLE)
238 return nfs42_proc_deallocate(filep, offset, len);
239 return nfs42_proc_allocate(filep, offset, len);
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)
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;
253 /* NFS does not support deduplication. */
254 if (remap_flags & REMAP_FILE_DEDUP)
257 if (remap_flags & ~REMAP_FILE_ADVISORY)
260 if (IS_SWAPFILE(dst_inode) || IS_SWAPFILE(src_inode))
263 /* check alignment w.r.t. clone_blksize */
266 if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs))
268 if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
272 if (src_inode == dst_inode)
275 /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
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);
282 inode_lock_nested(src_inode, I_MUTEX_PARENT);
283 inode_lock_nested(dst_inode, I_MUTEX_CHILD);
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);
291 ret = nfs_sync_inode(dst_inode);
295 ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
297 /* truncate inode page cache of the dst range so that future reads can fetch
298 * new data from server */
300 truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);
304 inode_unlock(src_inode);
305 } else if (dst_inode < src_inode) {
306 inode_unlock(src_inode);
307 inode_unlock(dst_inode);
309 inode_unlock(dst_inode);
310 inode_unlock(src_inode);
313 return ret < 0 ? ret : count;
316 static int read_name_gen = 1;
317 #define SSC_READ_NAME_BODY "ssc_read_%d"
319 static struct file *__nfs42_ssc_open(struct vfsmount *ss_mnt,
320 struct nfs_fh *src_fh, nfs4_stateid *stateid)
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;
331 server = NFS_SERVER(ss_mnt->mnt_root->d_inode);
333 nfs_fattr_init(&fattr);
335 status = nfs4_proc_getattr(server, src_fh, &fattr, NULL, NULL);
337 res = ERR_PTR(status);
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)
346 snprintf(read_name, len, SSC_READ_NAME_BODY, read_name_gen++);
348 r_ino = nfs_fhget(ss_mnt->mnt_root->d_inode->i_sb, src_fh, &fattr,
351 res = ERR_CAST(r_ino);
355 filep = alloc_file_pseudo(r_ino, ss_mnt, read_name, FMODE_READ,
358 res = ERR_CAST(filep);
361 filep->f_mode |= FMODE_READ;
363 ctx = alloc_nfs_open_context(filep->f_path.dentry, filep->f_mode,
370 res = ERR_PTR(-EINVAL);
371 sp = nfs4_get_state_owner(server, ctx->cred, GFP_KERNEL);
375 ctx->state = nfs4_get_open_state(r_ino, sp);
376 if (ctx->state == NULL)
379 set_bit(NFS_SRV_SSC_COPY_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 set_bit(NFS_OPEN_STATE, &ctx->state->flags);
385 nfs_file_set_open_context(filep, ctx);
386 put_nfs_open_context(ctx);
388 file_ra_state_init(&filep->f_ra, filep->f_mapping->host->i_mapping);
395 nfs4_put_state_owner(sp);
397 put_nfs_open_context(ctx);
403 static void __nfs42_ssc_close(struct file *filep)
405 struct nfs_open_context *ctx = nfs_file_open_context(filep);
407 ctx->state->flags = 0;
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,
416 * nfs42_ssc_register_ops - Wrapper to register NFS_V4 ops in nfs_common
421 void nfs42_ssc_register_ops(void)
423 nfs42_ssc_register(&nfs4_ssc_clnt_ops_tbl);
427 * nfs42_ssc_unregister_ops - wrapper to un-register NFS_V4 ops in nfs_common
432 void nfs42_ssc_unregister_ops(void)
434 nfs42_ssc_unregister(&nfs4_ssc_clnt_ops_tbl);
436 #endif /* CONFIG_NFS_V4_2 */
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,
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,
458 .llseek = nfs_file_llseek,