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 "delegation.h"
20 #ifdef CONFIG_NFS_V4_2
24 #define NFSDBG_FACILITY NFSDBG_FILE
27 nfs4_file_open(struct inode *inode, struct file *filp)
29 struct nfs_open_context *ctx;
30 struct dentry *dentry = file_dentry(filp);
31 struct dentry *parent = NULL;
33 unsigned openflags = filp->f_flags;
38 * If no cached dentry exists or if it's negative, NFSv4 handled the
39 * opens in ->lookup() or ->create().
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.
46 dprintk("NFS: open file(%pd2)\n", dentry);
48 err = nfs_check_flags(openflags);
52 if ((openflags & O_ACCMODE) == 3)
53 return nfs_open(inode, filp);
55 /* We can't create new files here */
56 openflags &= ~(O_CREAT|O_EXCL);
58 parent = dget_parent(dentry);
59 dir = d_inode(parent);
61 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
66 attr.ia_valid = ATTR_OPEN;
67 if (openflags & O_TRUNC) {
68 attr.ia_valid |= ATTR_SIZE;
70 filemap_write_and_wait(inode->i_mapping);
73 inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
87 if (inode != d_inode(dentry))
90 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
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);
115 dprintk("NFS: flush(%pD2)\n", file);
117 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
118 if ((file->f_mode & FMODE_WRITE) == 0)
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.
125 if (!nfs4_delegation_flush_on_close(inode))
126 return filemap_fdatawrite(file->f_mapping);
128 /* Flush writes to the server and return any errors */
129 return nfs_wb_all(inode);
132 #ifdef CONFIG_NFS_V4_2
133 static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
134 struct file *file_out, loff_t pos_out,
135 size_t count, unsigned int flags)
137 struct nfs42_copy_notify_res *cn_resp = NULL;
138 struct nl4_server *nss = NULL;
139 nfs4_stateid *cnrs = NULL;
143 /* Only offload copy if superblock is the same */
144 if (file_in->f_op != &nfs4_file_operations)
146 if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY))
148 if (file_inode(file_in) == file_inode(file_out))
150 /* if the copy size if smaller than 2 RPC payloads, make it
153 if (count <= 2 * NFS_SERVER(file_inode(file_in))->rsize)
156 if (!nfs42_files_from_same_server(file_in, file_out)) {
157 /* for inter copy, if copy size if smaller than 12 RPC
158 * payloads, fallback to traditional copy. There are
159 * 14 RPCs during an NFSv4.x mount between source/dest
163 count <= 14 * NFS_SERVER(file_inode(file_in))->rsize)
165 cn_resp = kzalloc(sizeof(struct nfs42_copy_notify_res),
167 if (unlikely(cn_resp == NULL))
170 ret = nfs42_proc_copy_notify(file_in, file_out, cn_resp);
175 nss = &cn_resp->cnr_src;
176 cnrs = &cn_resp->cnr_stateid;
178 ret = nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count,
181 if (!nfs42_files_from_same_server(file_in, file_out))
188 static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
189 struct file *file_out, loff_t pos_out,
190 size_t count, unsigned int flags)
194 ret = __nfs4_copy_file_range(file_in, pos_in, file_out, pos_out, count,
196 if (ret == -EOPNOTSUPP || ret == -EXDEV)
197 ret = generic_copy_file_range(file_in, pos_in, file_out,
198 pos_out, count, flags);
202 static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
209 ret = nfs42_proc_llseek(filep, offset, whence);
210 if (ret != -ENOTSUPP)
214 return nfs_file_llseek(filep, offset, whence);
218 static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
220 struct inode *inode = file_inode(filep);
223 if (!S_ISREG(inode->i_mode))
226 if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
229 ret = inode_newsize_ok(inode, offset + len);
233 if (mode & FALLOC_FL_PUNCH_HOLE)
234 return nfs42_proc_deallocate(filep, offset, len);
235 return nfs42_proc_allocate(filep, offset, len);
238 static loff_t nfs42_remap_file_range(struct file *src_file, loff_t src_off,
239 struct file *dst_file, loff_t dst_off, loff_t count,
240 unsigned int remap_flags)
242 struct inode *dst_inode = file_inode(dst_file);
243 struct nfs_server *server = NFS_SERVER(dst_inode);
244 struct inode *src_inode = file_inode(src_file);
245 unsigned int bs = server->clone_blksize;
246 bool same_inode = false;
249 /* NFS does not support deduplication. */
250 if (remap_flags & REMAP_FILE_DEDUP)
253 if (remap_flags & ~REMAP_FILE_ADVISORY)
256 /* check alignment w.r.t. clone_blksize */
259 if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs))
261 if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
265 if (src_inode == dst_inode)
268 /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
270 inode_lock(src_inode);
271 } else if (dst_inode < src_inode) {
272 inode_lock_nested(dst_inode, I_MUTEX_PARENT);
273 inode_lock_nested(src_inode, I_MUTEX_CHILD);
275 inode_lock_nested(src_inode, I_MUTEX_PARENT);
276 inode_lock_nested(dst_inode, I_MUTEX_CHILD);
279 /* flush all pending writes on both src and dst so that server
280 * has the latest data */
281 ret = nfs_sync_inode(src_inode);
284 ret = nfs_sync_inode(dst_inode);
288 ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
290 /* truncate inode page cache of the dst range so that future reads can fetch
291 * new data from server */
293 truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);
297 inode_unlock(src_inode);
298 } else if (dst_inode < src_inode) {
299 inode_unlock(src_inode);
300 inode_unlock(dst_inode);
302 inode_unlock(dst_inode);
303 inode_unlock(src_inode);
306 return ret < 0 ? ret : count;
309 static int read_name_gen = 1;
310 #define SSC_READ_NAME_BODY "ssc_read_%d"
313 nfs42_ssc_open(struct vfsmount *ss_mnt, struct nfs_fh *src_fh,
314 nfs4_stateid *stateid)
316 struct nfs_fattr fattr;
317 struct file *filep, *res;
318 struct nfs_server *server;
319 struct inode *r_ino = NULL;
320 struct nfs_open_context *ctx;
321 struct nfs4_state_owner *sp;
322 char *read_name = NULL;
325 server = NFS_SERVER(ss_mnt->mnt_root->d_inode);
327 nfs_fattr_init(&fattr);
329 status = nfs4_proc_getattr(server, src_fh, &fattr, NULL, NULL);
331 res = ERR_PTR(status);
335 res = ERR_PTR(-ENOMEM);
336 len = strlen(SSC_READ_NAME_BODY) + 16;
337 read_name = kzalloc(len, GFP_NOFS);
338 if (read_name == NULL)
340 snprintf(read_name, len, SSC_READ_NAME_BODY, read_name_gen++);
342 r_ino = nfs_fhget(ss_mnt->mnt_root->d_inode->i_sb, src_fh, &fattr,
345 res = ERR_CAST(r_ino);
349 filep = alloc_file_pseudo(r_ino, ss_mnt, read_name, FMODE_READ,
352 res = ERR_CAST(filep);
355 filep->f_mode |= FMODE_READ;
357 ctx = alloc_nfs_open_context(filep->f_path.dentry, filep->f_mode,
364 res = ERR_PTR(-EINVAL);
365 sp = nfs4_get_state_owner(server, ctx->cred, GFP_KERNEL);
369 ctx->state = nfs4_get_open_state(r_ino, sp);
370 if (ctx->state == NULL)
373 set_bit(NFS_SRV_SSC_COPY_STATE, &ctx->state->flags);
374 set_bit(NFS_OPEN_STATE, &ctx->state->flags);
375 memcpy(&ctx->state->open_stateid.other, &stateid->other,
376 NFS4_STATEID_OTHER_SIZE);
377 update_open_stateid(ctx->state, stateid, NULL, filep->f_mode);
379 nfs_file_set_open_context(filep, ctx);
380 put_nfs_open_context(ctx);
382 file_ra_state_init(&filep->f_ra, filep->f_mapping->host->i_mapping);
389 nfs4_put_state_owner(sp);
391 put_nfs_open_context(ctx);
396 EXPORT_SYMBOL_GPL(nfs42_ssc_open);
397 void nfs42_ssc_close(struct file *filep)
399 struct nfs_open_context *ctx = nfs_file_open_context(filep);
401 ctx->state->flags = 0;
403 EXPORT_SYMBOL_GPL(nfs42_ssc_close);
404 #endif /* CONFIG_NFS_V4_2 */
406 const struct file_operations nfs4_file_operations = {
407 .read_iter = nfs_file_read,
408 .write_iter = nfs_file_write,
409 .mmap = nfs_file_mmap,
410 .open = nfs4_file_open,
411 .flush = nfs4_file_flush,
412 .release = nfs_file_release,
413 .fsync = nfs_file_fsync,
416 .splice_read = generic_file_splice_read,
417 .splice_write = iter_file_splice_write,
418 .check_flags = nfs_check_flags,
419 .setlease = simple_nosetlease,
420 #ifdef CONFIG_NFS_V4_2
421 .copy_file_range = nfs4_copy_file_range,
422 .llseek = nfs4_file_llseek,
423 .fallocate = nfs42_fallocate,
424 .remap_file_range = nfs42_remap_file_range,
426 .llseek = nfs_file_llseek,