Commit | Line | Data |
---|---|---|
ce4ef7c0 BS |
1 | /* |
2 | * linux/fs/nfs/file.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | */ | |
f4ac1674 AS |
6 | #include <linux/fs.h> |
7 | #include <linux/falloc.h> | |
ce4ef7c0 | 8 | #include <linux/nfs_fs.h> |
5445b1fb | 9 | #include "delegation.h" |
ce4ef7c0 | 10 | #include "internal.h" |
5445b1fb | 11 | #include "iostat.h" |
a4ff1468 | 12 | #include "fscache.h" |
ce4ef7c0 BS |
13 | #include "pnfs.h" |
14 | ||
81b79afb TM |
15 | #include "nfstrace.h" |
16 | ||
1c6dcbe5 AS |
17 | #ifdef CONFIG_NFS_V4_2 |
18 | #include "nfs42.h" | |
19 | #endif | |
20 | ||
ce4ef7c0 BS |
21 | #define NFSDBG_FACILITY NFSDBG_FILE |
22 | ||
23 | static int | |
24 | nfs4_file_open(struct inode *inode, struct file *filp) | |
25 | { | |
26 | struct nfs_open_context *ctx; | |
27 | struct dentry *dentry = filp->f_path.dentry; | |
28 | struct dentry *parent = NULL; | |
29 | struct inode *dir; | |
30 | unsigned openflags = filp->f_flags; | |
31 | struct iattr attr; | |
32 | int err; | |
33 | ||
ce4ef7c0 BS |
34 | /* |
35 | * If no cached dentry exists or if it's negative, NFSv4 handled the | |
36 | * opens in ->lookup() or ->create(). | |
37 | * | |
38 | * We only get this far for a cached positive dentry. We skipped | |
39 | * revalidation, so handle it here by dropping the dentry and returning | |
40 | * -EOPENSTALE. The VFS will retry the lookup/create/open. | |
41 | */ | |
42 | ||
6de1472f | 43 | dprintk("NFS: open file(%pd2)\n", dentry); |
ce4ef7c0 | 44 | |
18a60089 BC |
45 | err = nfs_check_flags(openflags); |
46 | if (err) | |
47 | return err; | |
48 | ||
ce4ef7c0 BS |
49 | if ((openflags & O_ACCMODE) == 3) |
50 | openflags--; | |
51 | ||
52 | /* We can't create new files here */ | |
53 | openflags &= ~(O_CREAT|O_EXCL); | |
54 | ||
55 | parent = dget_parent(dentry); | |
2b0143b5 | 56 | dir = d_inode(parent); |
ce4ef7c0 BS |
57 | |
58 | ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode); | |
59 | err = PTR_ERR(ctx); | |
60 | if (IS_ERR(ctx)) | |
61 | goto out; | |
62 | ||
63 | attr.ia_valid = ATTR_OPEN; | |
64 | if (openflags & O_TRUNC) { | |
65 | attr.ia_valid |= ATTR_SIZE; | |
66 | attr.ia_size = 0; | |
9e1681c2 | 67 | nfs_sync_inode(inode); |
ce4ef7c0 BS |
68 | } |
69 | ||
c5c3fb5f | 70 | inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL); |
ce4ef7c0 BS |
71 | if (IS_ERR(inode)) { |
72 | err = PTR_ERR(inode); | |
73 | switch (err) { | |
74 | case -EPERM: | |
75 | case -EACCES: | |
76 | case -EDQUOT: | |
77 | case -ENOSPC: | |
78 | case -EROFS: | |
79 | goto out_put_ctx; | |
80 | default: | |
81 | goto out_drop; | |
82 | } | |
83 | } | |
2b0143b5 | 84 | if (inode != d_inode(dentry)) |
ce4ef7c0 BS |
85 | goto out_drop; |
86 | ||
87 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
88 | nfs_file_set_open_context(filp, ctx); | |
f1fe29b4 | 89 | nfs_fscache_open_file(inode, filp); |
ce4ef7c0 BS |
90 | err = 0; |
91 | ||
92 | out_put_ctx: | |
93 | put_nfs_open_context(ctx); | |
94 | out: | |
95 | dput(parent); | |
96 | return err; | |
97 | ||
98 | out_drop: | |
99 | d_drop(dentry); | |
100 | err = -EOPENSTALE; | |
101 | goto out_put_ctx; | |
102 | } | |
103 | ||
5445b1fb TM |
104 | /* |
105 | * Flush all dirty pages, and check for write errors. | |
106 | */ | |
107 | static int | |
108 | nfs4_file_flush(struct file *file, fl_owner_t id) | |
109 | { | |
110 | struct inode *inode = file_inode(file); | |
111 | ||
112 | dprintk("NFS: flush(%pD2)\n", file); | |
113 | ||
114 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); | |
115 | if ((file->f_mode & FMODE_WRITE) == 0) | |
116 | return 0; | |
117 | ||
118 | /* | |
119 | * If we're holding a write delegation, then check if we're required | |
120 | * to flush the i/o on close. If not, then just start the i/o now. | |
121 | */ | |
122 | if (!nfs4_delegation_flush_on_close(inode)) | |
123 | return filemap_fdatawrite(file->f_mapping); | |
124 | ||
125 | /* Flush writes to the server and return any errors */ | |
126 | return vfs_fsync(file, 0); | |
127 | } | |
128 | ||
ce4ef7c0 BS |
129 | static int |
130 | nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) | |
131 | { | |
132 | int ret; | |
496ad9aa | 133 | struct inode *inode = file_inode(file); |
ce4ef7c0 | 134 | |
81b79afb TM |
135 | trace_nfs_fsync_enter(inode); |
136 | ||
a0815d55 | 137 | nfs_inode_dio_wait(inode); |
05990d1b TM |
138 | do { |
139 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
140 | if (ret != 0) | |
141 | break; | |
142 | mutex_lock(&inode->i_mutex); | |
143 | ret = nfs_file_fsync_commit(file, start, end, datasync); | |
1b33809e | 144 | if (!ret) |
5bb89b47 | 145 | ret = pnfs_sync_inode(inode, !!datasync); |
05990d1b | 146 | mutex_unlock(&inode->i_mutex); |
dcfc4f25 TM |
147 | /* |
148 | * If nfs_file_fsync_commit detected a server reboot, then | |
149 | * resend all dirty pages that might have been covered by | |
150 | * the NFS_CONTEXT_RESEND_WRITES flag | |
151 | */ | |
152 | start = 0; | |
153 | end = LLONG_MAX; | |
05990d1b TM |
154 | } while (ret == -EAGAIN); |
155 | ||
81b79afb | 156 | trace_nfs_fsync_exit(inode, ret); |
ce4ef7c0 BS |
157 | return ret; |
158 | } | |
159 | ||
1c6dcbe5 AS |
160 | #ifdef CONFIG_NFS_V4_2 |
161 | static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence) | |
162 | { | |
163 | loff_t ret; | |
164 | ||
165 | switch (whence) { | |
166 | case SEEK_HOLE: | |
167 | case SEEK_DATA: | |
168 | ret = nfs42_proc_llseek(filep, offset, whence); | |
169 | if (ret != -ENOTSUPP) | |
170 | return ret; | |
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 | } |
1c6dcbe5 AS |
195 | #endif /* CONFIG_NFS_V4_2 */ |
196 | ||
ce4ef7c0 | 197 | const struct file_operations nfs4_file_operations = { |
1c6dcbe5 AS |
198 | #ifdef CONFIG_NFS_V4_2 |
199 | .llseek = nfs4_file_llseek, | |
200 | #else | |
ce4ef7c0 | 201 | .llseek = nfs_file_llseek, |
1c6dcbe5 | 202 | #endif |
3aa2d199 | 203 | .read_iter = nfs_file_read, |
edaf4369 | 204 | .write_iter = nfs_file_write, |
ce4ef7c0 BS |
205 | .mmap = nfs_file_mmap, |
206 | .open = nfs4_file_open, | |
5445b1fb | 207 | .flush = nfs4_file_flush, |
ce4ef7c0 BS |
208 | .release = nfs_file_release, |
209 | .fsync = nfs4_file_fsync, | |
210 | .lock = nfs_lock, | |
211 | .flock = nfs_flock, | |
212 | .splice_read = nfs_file_splice_read, | |
4da54c21 | 213 | .splice_write = iter_file_splice_write, |
f4ac1674 AS |
214 | #ifdef CONFIG_NFS_V4_2 |
215 | .fallocate = nfs42_fallocate, | |
216 | #endif /* CONFIG_NFS_V4_2 */ | |
ce4ef7c0 | 217 | .check_flags = nfs_check_flags, |
1c994a09 | 218 | .setlease = simple_nosetlease, |
ce4ef7c0 | 219 | }; |