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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/nfs_fs.h> | |
11 | #include "delegation.h" | |
12 | #include "internal.h" | |
13 | #include "iostat.h" | |
14 | #include "fscache.h" | |
15 | #include "pnfs.h" | |
16 | ||
17 | #include "nfstrace.h" | |
18 | ||
19 | #ifdef CONFIG_NFS_V4_2 | |
20 | #include "nfs42.h" | |
21 | #endif | |
22 | ||
23 | #define NFSDBG_FACILITY NFSDBG_FILE | |
24 | ||
25 | static int | |
26 | nfs4_file_open(struct inode *inode, struct file *filp) | |
27 | { | |
28 | struct nfs_open_context *ctx; | |
29 | struct dentry *dentry = file_dentry(filp); | |
30 | struct dentry *parent = NULL; | |
31 | struct inode *dir; | |
32 | unsigned openflags = filp->f_flags; | |
33 | struct iattr attr; | |
34 | int err; | |
35 | ||
36 | /* | |
37 | * If no cached dentry exists or if it's negative, NFSv4 handled the | |
38 | * opens in ->lookup() or ->create(). | |
39 | * | |
40 | * We only get this far for a cached positive dentry. We skipped | |
41 | * revalidation, so handle it here by dropping the dentry and returning | |
42 | * -EOPENSTALE. The VFS will retry the lookup/create/open. | |
43 | */ | |
44 | ||
45 | dprintk("NFS: open file(%pd2)\n", dentry); | |
46 | ||
47 | err = nfs_check_flags(openflags); | |
48 | if (err) | |
49 | return err; | |
50 | ||
51 | if ((openflags & O_ACCMODE) == 3) | |
52 | openflags--; | |
53 | ||
54 | /* We can't create new files here */ | |
55 | openflags &= ~(O_CREAT|O_EXCL); | |
56 | ||
57 | parent = dget_parent(dentry); | |
58 | dir = d_inode(parent); | |
59 | ||
60 | ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp); | |
61 | err = PTR_ERR(ctx); | |
62 | if (IS_ERR(ctx)) | |
63 | goto out; | |
64 | ||
65 | attr.ia_valid = ATTR_OPEN; | |
66 | if (openflags & O_TRUNC) { | |
67 | attr.ia_valid |= ATTR_SIZE; | |
68 | attr.ia_size = 0; | |
69 | filemap_write_and_wait(inode->i_mapping); | |
70 | } | |
71 | ||
72 | inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL); | |
73 | if (IS_ERR(inode)) { | |
74 | err = PTR_ERR(inode); | |
75 | switch (err) { | |
76 | case -EPERM: | |
77 | case -EACCES: | |
78 | case -EDQUOT: | |
79 | case -ENOSPC: | |
80 | case -EROFS: | |
81 | goto out_put_ctx; | |
82 | default: | |
83 | goto out_drop; | |
84 | } | |
85 | } | |
86 | if (inode != d_inode(dentry)) | |
87 | goto out_drop; | |
88 | ||
89 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
90 | nfs_file_set_open_context(filp, ctx); | |
91 | nfs_fscache_open_file(inode, filp); | |
92 | err = 0; | |
93 | ||
94 | out_put_ctx: | |
95 | put_nfs_open_context(ctx); | |
96 | out: | |
97 | dput(parent); | |
98 | return err; | |
99 | ||
100 | out_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 | */ | |
109 | static int | |
110 | nfs4_file_flush(struct file *file, fl_owner_t id) | |
111 | { | |
112 | struct inode *inode = file_inode(file); | |
113 | ||
114 | dprintk("NFS: flush(%pD2)\n", file); | |
115 | ||
116 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); | |
117 | if ((file->f_mode & FMODE_WRITE) == 0) | |
118 | return 0; | |
119 | ||
120 | /* | |
121 | * If we're holding a write delegation, then check if we're required | |
122 | * to flush the i/o on close. If not, then just start the i/o now. | |
123 | */ | |
124 | if (!nfs4_delegation_flush_on_close(inode)) | |
125 | return filemap_fdatawrite(file->f_mapping); | |
126 | ||
127 | /* Flush writes to the server and return any errors */ | |
128 | return nfs_wb_all(inode); | |
129 | } | |
130 | ||
131 | #ifdef CONFIG_NFS_V4_2 | |
132 | static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in, | |
133 | struct file *file_out, loff_t pos_out, | |
134 | size_t count, unsigned int flags) | |
135 | { | |
136 | /* Only offload copy if superblock is the same */ | |
137 | if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb) | |
138 | return -EXDEV; | |
139 | if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY)) | |
140 | return -EOPNOTSUPP; | |
141 | if (file_inode(file_in) == file_inode(file_out)) | |
142 | return -EOPNOTSUPP; | |
143 | return nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count); | |
144 | } | |
145 | ||
146 | static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in, | |
147 | struct file *file_out, loff_t pos_out, | |
148 | size_t count, unsigned int flags) | |
149 | { | |
150 | ssize_t ret; | |
151 | ||
152 | ret = __nfs4_copy_file_range(file_in, pos_in, file_out, pos_out, count, | |
153 | flags); | |
154 | if (ret == -EOPNOTSUPP || ret == -EXDEV) | |
155 | ret = generic_copy_file_range(file_in, pos_in, file_out, | |
156 | pos_out, count, flags); | |
157 | return ret; | |
158 | } | |
159 | ||
160 | static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence) | |
161 | { | |
162 | loff_t ret; | |
163 | ||
164 | switch (whence) { | |
165 | case SEEK_HOLE: | |
166 | case SEEK_DATA: | |
167 | ret = nfs42_proc_llseek(filep, offset, whence); | |
168 | if (ret != -ENOTSUPP) | |
169 | return ret; | |
170 | /* Fall through */ | |
171 | default: | |
172 | return nfs_file_llseek(filep, offset, whence); | |
173 | } | |
174 | } | |
175 | ||
176 | static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len) | |
177 | { | |
178 | struct inode *inode = file_inode(filep); | |
179 | long ret; | |
180 | ||
181 | if (!S_ISREG(inode->i_mode)) | |
182 | return -EOPNOTSUPP; | |
183 | ||
184 | if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))) | |
185 | return -EOPNOTSUPP; | |
186 | ||
187 | ret = inode_newsize_ok(inode, offset + len); | |
188 | if (ret < 0) | |
189 | return ret; | |
190 | ||
191 | if (mode & FALLOC_FL_PUNCH_HOLE) | |
192 | return nfs42_proc_deallocate(filep, offset, len); | |
193 | return nfs42_proc_allocate(filep, offset, len); | |
194 | } | |
195 | ||
196 | static loff_t nfs42_remap_file_range(struct file *src_file, loff_t src_off, | |
197 | struct file *dst_file, loff_t dst_off, loff_t count, | |
198 | unsigned int remap_flags) | |
199 | { | |
200 | struct inode *dst_inode = file_inode(dst_file); | |
201 | struct nfs_server *server = NFS_SERVER(dst_inode); | |
202 | struct inode *src_inode = file_inode(src_file); | |
203 | unsigned int bs = server->clone_blksize; | |
204 | bool same_inode = false; | |
205 | int ret; | |
206 | ||
207 | if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY)) | |
208 | return -EINVAL; | |
209 | ||
210 | /* check alignment w.r.t. clone_blksize */ | |
211 | ret = -EINVAL; | |
212 | if (bs) { | |
213 | if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs)) | |
214 | goto out; | |
215 | if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count)) | |
216 | goto out; | |
217 | } | |
218 | ||
219 | if (src_inode == dst_inode) | |
220 | same_inode = true; | |
221 | ||
222 | /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */ | |
223 | if (same_inode) { | |
224 | inode_lock(src_inode); | |
225 | } else if (dst_inode < src_inode) { | |
226 | inode_lock_nested(dst_inode, I_MUTEX_PARENT); | |
227 | inode_lock_nested(src_inode, I_MUTEX_CHILD); | |
228 | } else { | |
229 | inode_lock_nested(src_inode, I_MUTEX_PARENT); | |
230 | inode_lock_nested(dst_inode, I_MUTEX_CHILD); | |
231 | } | |
232 | ||
233 | /* flush all pending writes on both src and dst so that server | |
234 | * has the latest data */ | |
235 | ret = nfs_sync_inode(src_inode); | |
236 | if (ret) | |
237 | goto out_unlock; | |
238 | ret = nfs_sync_inode(dst_inode); | |
239 | if (ret) | |
240 | goto out_unlock; | |
241 | ||
242 | ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count); | |
243 | ||
244 | /* truncate inode page cache of the dst range so that future reads can fetch | |
245 | * new data from server */ | |
246 | if (!ret) | |
247 | truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1); | |
248 | ||
249 | out_unlock: | |
250 | if (same_inode) { | |
251 | inode_unlock(src_inode); | |
252 | } else if (dst_inode < src_inode) { | |
253 | inode_unlock(src_inode); | |
254 | inode_unlock(dst_inode); | |
255 | } else { | |
256 | inode_unlock(dst_inode); | |
257 | inode_unlock(src_inode); | |
258 | } | |
259 | out: | |
260 | return ret < 0 ? ret : count; | |
261 | } | |
262 | #endif /* CONFIG_NFS_V4_2 */ | |
263 | ||
264 | const struct file_operations nfs4_file_operations = { | |
265 | .read_iter = nfs_file_read, | |
266 | .write_iter = nfs_file_write, | |
267 | .mmap = nfs_file_mmap, | |
268 | .open = nfs4_file_open, | |
269 | .flush = nfs4_file_flush, | |
270 | .release = nfs_file_release, | |
271 | .fsync = nfs_file_fsync, | |
272 | .lock = nfs_lock, | |
273 | .flock = nfs_flock, | |
274 | .splice_read = generic_file_splice_read, | |
275 | .splice_write = iter_file_splice_write, | |
276 | .check_flags = nfs_check_flags, | |
277 | .setlease = simple_nosetlease, | |
278 | #ifdef CONFIG_NFS_V4_2 | |
279 | .copy_file_range = nfs4_copy_file_range, | |
280 | .llseek = nfs4_file_llseek, | |
281 | .fallocate = nfs42_fallocate, | |
282 | .remap_file_range = nfs42_remap_file_range, | |
283 | #else | |
284 | .llseek = nfs_file_llseek, | |
285 | #endif | |
286 | }; |