Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ce4ef7c0 BS |
2 | /* |
3 | * linux/fs/nfs/file.c | |
4 | * | |
5 | * Copyright (C) 1992 Rick Sladkey | |
6 | */ | |
f4ac1674 | 7 | #include <linux/fs.h> |
bea51b30 | 8 | #include <linux/file.h> |
f4ac1674 | 9 | #include <linux/falloc.h> |
ce4ef7c0 | 10 | #include <linux/nfs_fs.h> |
5445b1fb | 11 | #include "delegation.h" |
ce4ef7c0 | 12 | #include "internal.h" |
5445b1fb | 13 | #include "iostat.h" |
a4ff1468 | 14 | #include "fscache.h" |
ce4ef7c0 BS |
15 | #include "pnfs.h" |
16 | ||
81b79afb TM |
17 | #include "nfstrace.h" |
18 | ||
1c6dcbe5 AS |
19 | #ifdef CONFIG_NFS_V4_2 |
20 | #include "nfs42.h" | |
21 | #endif | |
22 | ||
ce4ef7c0 BS |
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; | |
be62a1a8 | 29 | struct dentry *dentry = file_dentry(filp); |
ce4ef7c0 BS |
30 | struct dentry *parent = NULL; |
31 | struct inode *dir; | |
32 | unsigned openflags = filp->f_flags; | |
33 | struct iattr attr; | |
34 | int err; | |
35 | ||
ce4ef7c0 BS |
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 | ||
6de1472f | 45 | dprintk("NFS: open file(%pd2)\n", dentry); |
ce4ef7c0 | 46 | |
18a60089 BC |
47 | err = nfs_check_flags(openflags); |
48 | if (err) | |
49 | return err; | |
50 | ||
ce4ef7c0 | 51 | if ((openflags & O_ACCMODE) == 3) |
44942b4e | 52 | return nfs_open(inode, filp); |
ce4ef7c0 BS |
53 | |
54 | /* We can't create new files here */ | |
55 | openflags &= ~(O_CREAT|O_EXCL); | |
56 | ||
57 | parent = dget_parent(dentry); | |
2b0143b5 | 58 | dir = d_inode(parent); |
ce4ef7c0 | 59 | |
532d4def | 60 | ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp); |
ce4ef7c0 BS |
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; | |
8b7d9d09 | 69 | filemap_write_and_wait(inode->i_mapping); |
ce4ef7c0 BS |
70 | } |
71 | ||
c5c3fb5f | 72 | inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL); |
ce4ef7c0 BS |
73 | if (IS_ERR(inode)) { |
74 | err = PTR_ERR(inode); | |
75 | switch (err) { | |
ce4ef7c0 | 76 | default: |
90cf500e TM |
77 | goto out_put_ctx; |
78 | case -ENOENT: | |
79 | case -ESTALE: | |
80 | case -EISDIR: | |
81 | case -ENOTDIR: | |
82 | case -ELOOP: | |
ce4ef7c0 BS |
83 | goto out_drop; |
84 | } | |
85 | } | |
2b0143b5 | 86 | if (inode != d_inode(dentry)) |
ce4ef7c0 BS |
87 | goto out_drop; |
88 | ||
89 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
90 | nfs_file_set_open_context(filp, ctx); | |
f1fe29b4 | 91 | nfs_fscache_open_file(inode, filp); |
ce4ef7c0 BS |
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 | ||
5445b1fb TM |
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 */ | |
aded8d7b | 128 | return nfs_wb_all(inode); |
5445b1fb TM |
129 | } |
130 | ||
1c6dcbe5 | 131 | #ifdef CONFIG_NFS_V4_2 |
64bf5ff5 DC |
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) | |
2e72448b | 135 | { |
5dae222a AG |
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; | |
0769663b OK |
139 | if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY)) |
140 | return -EOPNOTSUPP; | |
837bb1d7 | 141 | if (file_inode(file_in) == file_inode(file_out)) |
0769663b | 142 | return -EOPNOTSUPP; |
45ac486e | 143 | return nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count); |
2e72448b AS |
144 | } |
145 | ||
64bf5ff5 DC |
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); | |
5dae222a | 154 | if (ret == -EOPNOTSUPP || ret == -EXDEV) |
64bf5ff5 DC |
155 | ret = generic_copy_file_range(file_in, pos_in, file_out, |
156 | pos_out, count, flags); | |
157 | return ret; | |
158 | } | |
159 | ||
1c6dcbe5 AS |
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; | |
01e03bdc | 170 | /* Fall through */ |
1c6dcbe5 AS |
171 | default: |
172 | return nfs_file_llseek(filep, offset, whence); | |
173 | } | |
174 | } | |
f4ac1674 AS |
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 | ||
624bd5b7 | 184 | if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))) |
f4ac1674 AS |
185 | return -EOPNOTSUPP; |
186 | ||
187 | ret = inode_newsize_ok(inode, offset + len); | |
188 | if (ret < 0) | |
189 | return ret; | |
190 | ||
624bd5b7 | 191 | if (mode & FALLOC_FL_PUNCH_HOLE) |
f830f7dd AS |
192 | return nfs42_proc_deallocate(filep, offset, len); |
193 | return nfs42_proc_allocate(filep, offset, len); | |
f4ac1674 | 194 | } |
bea51b30 | 195 | |
42ec3d4c DW |
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, | |
2e5dfc99 | 198 | unsigned int remap_flags) |
bea51b30 PT |
199 | { |
200 | struct inode *dst_inode = file_inode(dst_file); | |
811b7b85 | 201 | struct nfs_server *server = NFS_SERVER(dst_inode); |
04b38d60 | 202 | struct inode *src_inode = file_inode(src_file); |
811b7b85 | 203 | unsigned int bs = server->clone_blksize; |
21fad313 | 204 | bool same_inode = false; |
bea51b30 PT |
205 | int ret; |
206 | ||
9026b3a9 DW |
207 | /* NFS does not support deduplication. */ |
208 | if (remap_flags & REMAP_FILE_DEDUP) | |
209 | return -EOPNOTSUPP; | |
210 | ||
211 | if (remap_flags & ~REMAP_FILE_ADVISORY) | |
2e5dfc99 DW |
212 | return -EINVAL; |
213 | ||
811b7b85 PT |
214 | /* check alignment w.r.t. clone_blksize */ |
215 | ret = -EINVAL; | |
216 | if (bs) { | |
217 | if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs)) | |
04b38d60 | 218 | goto out; |
811b7b85 | 219 | if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count)) |
04b38d60 | 220 | goto out; |
811b7b85 PT |
221 | } |
222 | ||
04b38d60 CH |
223 | if (src_inode == dst_inode) |
224 | same_inode = true; | |
21fad313 | 225 | |
bea51b30 | 226 | /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */ |
21fad313 | 227 | if (same_inode) { |
5955102c | 228 | inode_lock(src_inode); |
21fad313 | 229 | } else if (dst_inode < src_inode) { |
5955102c AV |
230 | inode_lock_nested(dst_inode, I_MUTEX_PARENT); |
231 | inode_lock_nested(src_inode, I_MUTEX_CHILD); | |
bea51b30 | 232 | } else { |
5955102c AV |
233 | inode_lock_nested(src_inode, I_MUTEX_PARENT); |
234 | inode_lock_nested(dst_inode, I_MUTEX_CHILD); | |
bea51b30 PT |
235 | } |
236 | ||
237 | /* flush all pending writes on both src and dst so that server | |
238 | * has the latest data */ | |
239 | ret = nfs_sync_inode(src_inode); | |
240 | if (ret) | |
241 | goto out_unlock; | |
242 | ret = nfs_sync_inode(dst_inode); | |
243 | if (ret) | |
244 | goto out_unlock; | |
245 | ||
04b38d60 | 246 | ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count); |
bea51b30 PT |
247 | |
248 | /* truncate inode page cache of the dst range so that future reads can fetch | |
249 | * new data from server */ | |
250 | if (!ret) | |
251 | truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1); | |
252 | ||
253 | out_unlock: | |
21fad313 | 254 | if (same_inode) { |
5955102c | 255 | inode_unlock(src_inode); |
21fad313 | 256 | } else if (dst_inode < src_inode) { |
5955102c AV |
257 | inode_unlock(src_inode); |
258 | inode_unlock(dst_inode); | |
bea51b30 | 259 | } else { |
5955102c AV |
260 | inode_unlock(dst_inode); |
261 | inode_unlock(src_inode); | |
bea51b30 | 262 | } |
04b38d60 | 263 | out: |
42ec3d4c | 264 | return ret < 0 ? ret : count; |
bea51b30 | 265 | } |
6b7153da | 266 | #endif /* CONFIG_NFS_V4_2 */ |
bea51b30 | 267 | |
ce4ef7c0 | 268 | const struct file_operations nfs4_file_operations = { |
3aa2d199 | 269 | .read_iter = nfs_file_read, |
edaf4369 | 270 | .write_iter = nfs_file_write, |
ce4ef7c0 BS |
271 | .mmap = nfs_file_mmap, |
272 | .open = nfs4_file_open, | |
5445b1fb | 273 | .flush = nfs4_file_flush, |
ce4ef7c0 | 274 | .release = nfs_file_release, |
4ff79bc7 | 275 | .fsync = nfs_file_fsync, |
ce4ef7c0 BS |
276 | .lock = nfs_lock, |
277 | .flock = nfs_flock, | |
82c156f8 | 278 | .splice_read = generic_file_splice_read, |
4da54c21 | 279 | .splice_write = iter_file_splice_write, |
ce4ef7c0 | 280 | .check_flags = nfs_check_flags, |
1c994a09 | 281 | .setlease = simple_nosetlease, |
6b7153da | 282 | #ifdef CONFIG_NFS_V4_2 |
2e72448b | 283 | .copy_file_range = nfs4_copy_file_range, |
6b7153da CH |
284 | .llseek = nfs4_file_llseek, |
285 | .fallocate = nfs42_fallocate, | |
2e5dfc99 | 286 | .remap_file_range = nfs42_remap_file_range, |
6b7153da CH |
287 | #else |
288 | .llseek = nfs_file_llseek, | |
289 | #endif | |
ce4ef7c0 | 290 | }; |