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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * file.c | |
3 | * | |
4 | * Copyright (C) 1995, 1996 by Volker Lendecke | |
5 | * Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache | |
6 | * | |
7 | */ | |
8 | ||
b41f8b84 JP |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
10 | ||
1da177e4 | 11 | #include <asm/uaccess.h> |
1da177e4 LT |
12 | |
13 | #include <linux/time.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/fcntl.h> | |
17 | #include <linux/stat.h> | |
18 | #include <linux/mm.h> | |
1da177e4 | 19 | #include <linux/vmalloc.h> |
e8edc6e0 | 20 | #include <linux/sched.h> |
1da177e4 | 21 | |
32c419d9 | 22 | #include "ncp_fs.h" |
1da177e4 | 23 | |
02c24a82 | 24 | static int ncp_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
1da177e4 | 25 | { |
02c24a82 | 26 | return filemap_write_and_wait_range(file->f_mapping, start, end); |
1da177e4 LT |
27 | } |
28 | ||
29 | /* | |
30 | * Open a file with the specified read/write mode. | |
31 | */ | |
32 | int ncp_make_open(struct inode *inode, int right) | |
33 | { | |
34 | int error; | |
35 | int access; | |
36 | ||
37 | error = -EINVAL; | |
38 | if (!inode) { | |
b41f8b84 | 39 | pr_err("%s: got NULL inode\n", __func__); |
1da177e4 LT |
40 | goto out; |
41 | } | |
42 | ||
d3b73ca1 | 43 | ncp_dbg(1, "opened=%d, volume # %u, dir entry # %u\n", |
1da177e4 LT |
44 | atomic_read(&NCP_FINFO(inode)->opened), |
45 | NCP_FINFO(inode)->volNumber, | |
46 | NCP_FINFO(inode)->dirEntNum); | |
47 | error = -EACCES; | |
8e3f9045 | 48 | mutex_lock(&NCP_FINFO(inode)->open_mutex); |
1da177e4 LT |
49 | if (!atomic_read(&NCP_FINFO(inode)->opened)) { |
50 | struct ncp_entry_info finfo; | |
51 | int result; | |
52 | ||
53 | /* tries max. rights */ | |
54 | finfo.access = O_RDWR; | |
55 | result = ncp_open_create_file_or_subdir(NCP_SERVER(inode), | |
56 | inode, NULL, OC_MODE_OPEN, | |
57 | 0, AR_READ | AR_WRITE, &finfo); | |
58 | if (!result) | |
59 | goto update; | |
60 | /* RDWR did not succeeded, try readonly or writeonly as requested */ | |
61 | switch (right) { | |
62 | case O_RDONLY: | |
63 | finfo.access = O_RDONLY; | |
64 | result = ncp_open_create_file_or_subdir(NCP_SERVER(inode), | |
65 | inode, NULL, OC_MODE_OPEN, | |
66 | 0, AR_READ, &finfo); | |
67 | break; | |
68 | case O_WRONLY: | |
69 | finfo.access = O_WRONLY; | |
70 | result = ncp_open_create_file_or_subdir(NCP_SERVER(inode), | |
71 | inode, NULL, OC_MODE_OPEN, | |
72 | 0, AR_WRITE, &finfo); | |
73 | break; | |
74 | } | |
75 | if (result) { | |
e45ca8ba | 76 | ncp_vdbg("failed, result=%d\n", result); |
1da177e4 LT |
77 | goto out_unlock; |
78 | } | |
79 | /* | |
80 | * Update the inode information. | |
81 | */ | |
82 | update: | |
83 | ncp_update_inode(inode, &finfo); | |
84 | atomic_set(&NCP_FINFO(inode)->opened, 1); | |
85 | } | |
86 | ||
87 | access = NCP_FINFO(inode)->access; | |
e45ca8ba | 88 | ncp_vdbg("file open, access=%x\n", access); |
1da177e4 LT |
89 | if (access == right || access == O_RDWR) { |
90 | atomic_inc(&NCP_FINFO(inode)->opened); | |
91 | error = 0; | |
92 | } | |
93 | ||
94 | out_unlock: | |
8e3f9045 | 95 | mutex_unlock(&NCP_FINFO(inode)->open_mutex); |
1da177e4 LT |
96 | out: |
97 | return error; | |
98 | } | |
99 | ||
100 | static ssize_t | |
274a4886 | 101 | ncp_file_read_iter(struct kiocb *iocb, struct iov_iter *to) |
1da177e4 | 102 | { |
274a4886 | 103 | struct file *file = iocb->ki_filp; |
a67f797d | 104 | struct inode *inode = file_inode(file); |
1da177e4 | 105 | size_t already_read = 0; |
274a4886 | 106 | off_t pos = iocb->ki_pos; |
1da177e4 LT |
107 | size_t bufsize; |
108 | int error; | |
274a4886 | 109 | void *freepage; |
1da177e4 LT |
110 | size_t freelen; |
111 | ||
a67f797d | 112 | ncp_dbg(1, "enter %pD2\n", file); |
1da177e4 | 113 | |
274a4886 | 114 | if (!iov_iter_count(to)) |
1da177e4 LT |
115 | return 0; |
116 | if (pos > inode->i_sb->s_maxbytes) | |
117 | return 0; | |
274a4886 | 118 | iov_iter_truncate(to, inode->i_sb->s_maxbytes - pos); |
1da177e4 LT |
119 | |
120 | error = ncp_make_open(inode, O_RDONLY); | |
121 | if (error) { | |
d3b73ca1 | 122 | ncp_dbg(1, "open failed, error=%d\n", error); |
1da177e4 LT |
123 | return error; |
124 | } | |
125 | ||
126 | bufsize = NCP_SERVER(inode)->buffer_size; | |
127 | ||
128 | error = -EIO; | |
129 | freelen = ncp_read_bounce_size(bufsize); | |
130 | freepage = vmalloc(freelen); | |
131 | if (!freepage) | |
132 | goto outrel; | |
133 | error = 0; | |
134 | /* First read in as much as possible for each bufsize. */ | |
274a4886 | 135 | while (iov_iter_count(to)) { |
1da177e4 | 136 | int read_this_time; |
274a4886 | 137 | size_t to_read = min_t(size_t, |
1da177e4 | 138 | bufsize - (pos % bufsize), |
274a4886 | 139 | iov_iter_count(to)); |
1da177e4 LT |
140 | |
141 | error = ncp_read_bounce(NCP_SERVER(inode), | |
142 | NCP_FINFO(inode)->file_handle, | |
274a4886 | 143 | pos, to_read, to, &read_this_time, |
1da177e4 LT |
144 | freepage, freelen); |
145 | if (error) { | |
146 | error = -EIO; /* NW errno -> Linux errno */ | |
147 | break; | |
148 | } | |
149 | pos += read_this_time; | |
1da177e4 LT |
150 | already_read += read_this_time; |
151 | ||
274a4886 | 152 | if (read_this_time != to_read) |
1da177e4 | 153 | break; |
1da177e4 LT |
154 | } |
155 | vfree(freepage); | |
156 | ||
274a4886 | 157 | iocb->ki_pos = pos; |
1da177e4 LT |
158 | |
159 | file_accessed(file); | |
160 | ||
a67f797d | 161 | ncp_dbg(1, "exit %pD2\n", file); |
1da177e4 LT |
162 | outrel: |
163 | ncp_inode_close(inode); | |
164 | return already_read ? already_read : error; | |
165 | } | |
166 | ||
167 | static ssize_t | |
274a4886 | 168 | ncp_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
1da177e4 | 169 | { |
274a4886 | 170 | struct file *file = iocb->ki_filp; |
a67f797d | 171 | struct inode *inode = file_inode(file); |
1da177e4 | 172 | size_t already_written = 0; |
1da177e4 LT |
173 | size_t bufsize; |
174 | int errno; | |
274a4886 | 175 | void *bouncebuffer; |
3309dd04 | 176 | off_t pos; |
1da177e4 | 177 | |
a67f797d | 178 | ncp_dbg(1, "enter %pD2\n", file); |
3309dd04 AV |
179 | errno = generic_write_checks(iocb, from); |
180 | if (errno <= 0) | |
274a4886 | 181 | return errno; |
274a4886 | 182 | |
1da177e4 LT |
183 | errno = ncp_make_open(inode, O_WRONLY); |
184 | if (errno) { | |
d3b73ca1 | 185 | ncp_dbg(1, "open failed, error=%d\n", errno); |
1da177e4 LT |
186 | return errno; |
187 | } | |
188 | bufsize = NCP_SERVER(inode)->buffer_size; | |
189 | ||
c3b2da31 JB |
190 | errno = file_update_time(file); |
191 | if (errno) | |
192 | goto outrel; | |
193 | ||
1da177e4 LT |
194 | bouncebuffer = vmalloc(bufsize); |
195 | if (!bouncebuffer) { | |
196 | errno = -EIO; /* -ENOMEM */ | |
197 | goto outrel; | |
198 | } | |
3309dd04 | 199 | pos = iocb->ki_pos; |
274a4886 | 200 | while (iov_iter_count(from)) { |
1da177e4 | 201 | int written_this_time; |
274a4886 | 202 | size_t to_write = min_t(size_t, |
3309dd04 | 203 | bufsize - (pos % bufsize), |
274a4886 | 204 | iov_iter_count(from)); |
1da177e4 | 205 | |
274a4886 | 206 | if (copy_from_iter(bouncebuffer, to_write, from) != to_write) { |
1da177e4 LT |
207 | errno = -EFAULT; |
208 | break; | |
209 | } | |
210 | if (ncp_write_kernel(NCP_SERVER(inode), | |
211 | NCP_FINFO(inode)->file_handle, | |
212 | pos, to_write, bouncebuffer, &written_this_time) != 0) { | |
213 | errno = -EIO; | |
214 | break; | |
215 | } | |
216 | pos += written_this_time; | |
1da177e4 LT |
217 | already_written += written_this_time; |
218 | ||
274a4886 | 219 | if (written_this_time != to_write) |
1da177e4 | 220 | break; |
1da177e4 LT |
221 | } |
222 | vfree(bouncebuffer); | |
223 | ||
274a4886 | 224 | iocb->ki_pos = pos; |
1da177e4 | 225 | |
2e54eb96 | 226 | if (pos > i_size_read(inode)) { |
5955102c | 227 | inode_lock(inode); |
2e54eb96 PV |
228 | if (pos > i_size_read(inode)) |
229 | i_size_write(inode, pos); | |
5955102c | 230 | inode_unlock(inode); |
1da177e4 | 231 | } |
a67f797d | 232 | ncp_dbg(1, "exit %pD2\n", file); |
1da177e4 LT |
233 | outrel: |
234 | ncp_inode_close(inode); | |
235 | return already_written ? already_written : errno; | |
236 | } | |
237 | ||
238 | static int ncp_release(struct inode *inode, struct file *file) { | |
239 | if (ncp_make_closed(inode)) { | |
d3b73ca1 | 240 | ncp_dbg(1, "failed to close\n"); |
1da177e4 LT |
241 | } |
242 | return 0; | |
243 | } | |
244 | ||
4b6f5d20 | 245 | const struct file_operations ncp_file_operations = |
1da177e4 | 246 | { |
2e54eb96 | 247 | .llseek = generic_file_llseek, |
274a4886 AV |
248 | .read_iter = ncp_file_read_iter, |
249 | .write_iter = ncp_file_write_iter, | |
93d84b6d | 250 | .unlocked_ioctl = ncp_ioctl, |
54f67f63 PV |
251 | #ifdef CONFIG_COMPAT |
252 | .compat_ioctl = ncp_compat_ioctl, | |
253 | #endif | |
1da177e4 LT |
254 | .mmap = ncp_mmap, |
255 | .release = ncp_release, | |
256 | .fsync = ncp_fsync, | |
257 | }; | |
258 | ||
92e1d5be | 259 | const struct inode_operations ncp_file_inode_operations = |
1da177e4 LT |
260 | { |
261 | .setattr = ncp_notify_change, | |
262 | }; |