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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> |
0f42a6a9 | 11 | #include <uapi/linux/btrfs.h> /* BTRFS_IOC_CLONE/BTRFS_IOC_CLONE_RANGE */ |
5445b1fb | 12 | #include "delegation.h" |
ce4ef7c0 | 13 | #include "internal.h" |
5445b1fb | 14 | #include "iostat.h" |
a4ff1468 | 15 | #include "fscache.h" |
ce4ef7c0 BS |
16 | #include "pnfs.h" |
17 | ||
81b79afb TM |
18 | #include "nfstrace.h" |
19 | ||
1c6dcbe5 AS |
20 | #ifdef CONFIG_NFS_V4_2 |
21 | #include "nfs42.h" | |
22 | #endif | |
23 | ||
ce4ef7c0 BS |
24 | #define NFSDBG_FACILITY NFSDBG_FILE |
25 | ||
26 | static int | |
27 | nfs4_file_open(struct inode *inode, struct file *filp) | |
28 | { | |
29 | struct nfs_open_context *ctx; | |
be62a1a8 | 30 | struct dentry *dentry = file_dentry(filp); |
ce4ef7c0 BS |
31 | struct dentry *parent = NULL; |
32 | struct inode *dir; | |
33 | unsigned openflags = filp->f_flags; | |
34 | struct iattr attr; | |
35 | int err; | |
36 | ||
ce4ef7c0 BS |
37 | /* |
38 | * If no cached dentry exists or if it's negative, NFSv4 handled the | |
39 | * opens in ->lookup() or ->create(). | |
40 | * | |
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. | |
44 | */ | |
45 | ||
6de1472f | 46 | dprintk("NFS: open file(%pd2)\n", dentry); |
ce4ef7c0 | 47 | |
18a60089 BC |
48 | err = nfs_check_flags(openflags); |
49 | if (err) | |
50 | return err; | |
51 | ||
ce4ef7c0 BS |
52 | if ((openflags & O_ACCMODE) == 3) |
53 | openflags--; | |
54 | ||
55 | /* We can't create new files here */ | |
56 | openflags &= ~(O_CREAT|O_EXCL); | |
57 | ||
58 | parent = dget_parent(dentry); | |
2b0143b5 | 59 | dir = d_inode(parent); |
ce4ef7c0 | 60 | |
532d4def | 61 | ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp); |
ce4ef7c0 BS |
62 | err = PTR_ERR(ctx); |
63 | if (IS_ERR(ctx)) | |
64 | goto out; | |
65 | ||
66 | attr.ia_valid = ATTR_OPEN; | |
67 | if (openflags & O_TRUNC) { | |
68 | attr.ia_valid |= ATTR_SIZE; | |
69 | attr.ia_size = 0; | |
8b7d9d09 | 70 | filemap_write_and_wait(inode->i_mapping); |
ce4ef7c0 BS |
71 | } |
72 | ||
c5c3fb5f | 73 | inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL); |
ce4ef7c0 BS |
74 | if (IS_ERR(inode)) { |
75 | err = PTR_ERR(inode); | |
76 | switch (err) { | |
77 | case -EPERM: | |
78 | case -EACCES: | |
79 | case -EDQUOT: | |
80 | case -ENOSPC: | |
81 | case -EROFS: | |
82 | goto out_put_ctx; | |
83 | default: | |
84 | goto out_drop; | |
85 | } | |
86 | } | |
2b0143b5 | 87 | if (inode != d_inode(dentry)) |
ce4ef7c0 BS |
88 | goto out_drop; |
89 | ||
90 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
91 | nfs_file_set_open_context(filp, ctx); | |
f1fe29b4 | 92 | nfs_fscache_open_file(inode, filp); |
ce4ef7c0 BS |
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 | ||
5445b1fb TM |
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 | ||
115 | dprintk("NFS: flush(%pD2)\n", file); | |
116 | ||
117 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); | |
118 | if ((file->f_mode & FMODE_WRITE) == 0) | |
119 | return 0; | |
120 | ||
121 | /* | |
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. | |
124 | */ | |
125 | if (!nfs4_delegation_flush_on_close(inode)) | |
126 | return filemap_fdatawrite(file->f_mapping); | |
127 | ||
128 | /* Flush writes to the server and return any errors */ | |
129 | return vfs_fsync(file, 0); | |
130 | } | |
131 | ||
1c6dcbe5 | 132 | #ifdef CONFIG_NFS_V4_2 |
2e72448b AS |
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) | |
136 | { | |
837bb1d7 | 137 | if (file_inode(file_in) == file_inode(file_out)) |
2e72448b AS |
138 | return -EINVAL; |
139 | ||
2e72448b AS |
140 | return nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count); |
141 | } | |
142 | ||
1c6dcbe5 AS |
143 | static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence) |
144 | { | |
145 | loff_t ret; | |
146 | ||
147 | switch (whence) { | |
148 | case SEEK_HOLE: | |
149 | case SEEK_DATA: | |
150 | ret = nfs42_proc_llseek(filep, offset, whence); | |
151 | if (ret != -ENOTSUPP) | |
152 | return ret; | |
153 | default: | |
154 | return nfs_file_llseek(filep, offset, whence); | |
155 | } | |
156 | } | |
f4ac1674 AS |
157 | |
158 | static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len) | |
159 | { | |
160 | struct inode *inode = file_inode(filep); | |
161 | long ret; | |
162 | ||
163 | if (!S_ISREG(inode->i_mode)) | |
164 | return -EOPNOTSUPP; | |
165 | ||
624bd5b7 | 166 | if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))) |
f4ac1674 AS |
167 | return -EOPNOTSUPP; |
168 | ||
169 | ret = inode_newsize_ok(inode, offset + len); | |
170 | if (ret < 0) | |
171 | return ret; | |
172 | ||
624bd5b7 | 173 | if (mode & FALLOC_FL_PUNCH_HOLE) |
f830f7dd AS |
174 | return nfs42_proc_deallocate(filep, offset, len); |
175 | return nfs42_proc_allocate(filep, offset, len); | |
f4ac1674 | 176 | } |
bea51b30 | 177 | |
04b38d60 CH |
178 | static int nfs42_clone_file_range(struct file *src_file, loff_t src_off, |
179 | struct file *dst_file, loff_t dst_off, u64 count) | |
bea51b30 PT |
180 | { |
181 | struct inode *dst_inode = file_inode(dst_file); | |
811b7b85 | 182 | struct nfs_server *server = NFS_SERVER(dst_inode); |
04b38d60 | 183 | struct inode *src_inode = file_inode(src_file); |
811b7b85 | 184 | unsigned int bs = server->clone_blksize; |
21fad313 | 185 | bool same_inode = false; |
bea51b30 PT |
186 | int ret; |
187 | ||
811b7b85 PT |
188 | /* check alignment w.r.t. clone_blksize */ |
189 | ret = -EINVAL; | |
190 | if (bs) { | |
191 | if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs)) | |
04b38d60 | 192 | goto out; |
811b7b85 | 193 | if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count)) |
04b38d60 | 194 | goto out; |
811b7b85 PT |
195 | } |
196 | ||
04b38d60 CH |
197 | if (src_inode == dst_inode) |
198 | same_inode = true; | |
21fad313 | 199 | |
bea51b30 | 200 | /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */ |
21fad313 | 201 | if (same_inode) { |
5955102c | 202 | inode_lock(src_inode); |
21fad313 | 203 | } else if (dst_inode < src_inode) { |
5955102c AV |
204 | inode_lock_nested(dst_inode, I_MUTEX_PARENT); |
205 | inode_lock_nested(src_inode, I_MUTEX_CHILD); | |
bea51b30 | 206 | } else { |
5955102c AV |
207 | inode_lock_nested(src_inode, I_MUTEX_PARENT); |
208 | inode_lock_nested(dst_inode, I_MUTEX_CHILD); | |
bea51b30 PT |
209 | } |
210 | ||
211 | /* flush all pending writes on both src and dst so that server | |
212 | * has the latest data */ | |
213 | ret = nfs_sync_inode(src_inode); | |
214 | if (ret) | |
215 | goto out_unlock; | |
216 | ret = nfs_sync_inode(dst_inode); | |
217 | if (ret) | |
218 | goto out_unlock; | |
219 | ||
04b38d60 | 220 | ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count); |
bea51b30 PT |
221 | |
222 | /* truncate inode page cache of the dst range so that future reads can fetch | |
223 | * new data from server */ | |
224 | if (!ret) | |
225 | truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1); | |
226 | ||
227 | out_unlock: | |
21fad313 | 228 | if (same_inode) { |
5955102c | 229 | inode_unlock(src_inode); |
21fad313 | 230 | } else if (dst_inode < src_inode) { |
5955102c AV |
231 | inode_unlock(src_inode); |
232 | inode_unlock(dst_inode); | |
bea51b30 | 233 | } else { |
5955102c AV |
234 | inode_unlock(dst_inode); |
235 | inode_unlock(src_inode); | |
bea51b30 | 236 | } |
04b38d60 | 237 | out: |
bea51b30 PT |
238 | return ret; |
239 | } | |
6b7153da | 240 | #endif /* CONFIG_NFS_V4_2 */ |
bea51b30 | 241 | |
ce4ef7c0 | 242 | const struct file_operations nfs4_file_operations = { |
3aa2d199 | 243 | .read_iter = nfs_file_read, |
edaf4369 | 244 | .write_iter = nfs_file_write, |
ce4ef7c0 BS |
245 | .mmap = nfs_file_mmap, |
246 | .open = nfs4_file_open, | |
5445b1fb | 247 | .flush = nfs4_file_flush, |
ce4ef7c0 | 248 | .release = nfs_file_release, |
4ff79bc7 | 249 | .fsync = nfs_file_fsync, |
ce4ef7c0 BS |
250 | .lock = nfs_lock, |
251 | .flock = nfs_flock, | |
82c156f8 | 252 | .splice_read = generic_file_splice_read, |
4da54c21 | 253 | .splice_write = iter_file_splice_write, |
ce4ef7c0 | 254 | .check_flags = nfs_check_flags, |
1c994a09 | 255 | .setlease = simple_nosetlease, |
6b7153da | 256 | #ifdef CONFIG_NFS_V4_2 |
2e72448b | 257 | .copy_file_range = nfs4_copy_file_range, |
6b7153da CH |
258 | .llseek = nfs4_file_llseek, |
259 | .fallocate = nfs42_fallocate, | |
04b38d60 | 260 | .clone_file_range = nfs42_clone_file_range, |
6b7153da CH |
261 | #else |
262 | .llseek = nfs_file_llseek, | |
263 | #endif | |
ce4ef7c0 | 264 | }; |