Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 9 | #include <asm/uaccess.h> |
| 10 | #include <asm/system.h> |
| 11 | |
| 12 | #include <linux/time.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/errno.h> |
| 15 | #include <linux/fcntl.h> |
| 16 | #include <linux/stat.h> |
| 17 | #include <linux/mm.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/vmalloc.h> |
| 20 | #include <linux/smp_lock.h> |
| 21 | |
| 22 | #include <linux/ncp_fs.h> |
| 23 | #include "ncplib_kernel.h" |
| 24 | |
| 25 | static int ncp_fsync(struct file *file, struct dentry *dentry, int datasync) |
| 26 | { |
| 27 | return 0; |
| 28 | } |
| 29 | |
| 30 | /* |
| 31 | * Open a file with the specified read/write mode. |
| 32 | */ |
| 33 | int ncp_make_open(struct inode *inode, int right) |
| 34 | { |
| 35 | int error; |
| 36 | int access; |
| 37 | |
| 38 | error = -EINVAL; |
| 39 | if (!inode) { |
| 40 | printk(KERN_ERR "ncp_make_open: got NULL inode\n"); |
| 41 | goto out; |
| 42 | } |
| 43 | |
| 44 | DPRINTK("ncp_make_open: opened=%d, volume # %u, dir entry # %u\n", |
| 45 | atomic_read(&NCP_FINFO(inode)->opened), |
| 46 | NCP_FINFO(inode)->volNumber, |
| 47 | NCP_FINFO(inode)->dirEntNum); |
| 48 | error = -EACCES; |
Ingo Molnar | 8e3f904 | 2006-03-23 03:00:43 -0800 | [diff] [blame] | 49 | mutex_lock(&NCP_FINFO(inode)->open_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | if (!atomic_read(&NCP_FINFO(inode)->opened)) { |
| 51 | struct ncp_entry_info finfo; |
| 52 | int result; |
| 53 | |
| 54 | /* tries max. rights */ |
| 55 | finfo.access = O_RDWR; |
| 56 | result = ncp_open_create_file_or_subdir(NCP_SERVER(inode), |
| 57 | inode, NULL, OC_MODE_OPEN, |
| 58 | 0, AR_READ | AR_WRITE, &finfo); |
| 59 | if (!result) |
| 60 | goto update; |
| 61 | /* RDWR did not succeeded, try readonly or writeonly as requested */ |
| 62 | switch (right) { |
| 63 | case O_RDONLY: |
| 64 | finfo.access = O_RDONLY; |
| 65 | result = ncp_open_create_file_or_subdir(NCP_SERVER(inode), |
| 66 | inode, NULL, OC_MODE_OPEN, |
| 67 | 0, AR_READ, &finfo); |
| 68 | break; |
| 69 | case O_WRONLY: |
| 70 | finfo.access = O_WRONLY; |
| 71 | result = ncp_open_create_file_or_subdir(NCP_SERVER(inode), |
| 72 | inode, NULL, OC_MODE_OPEN, |
| 73 | 0, AR_WRITE, &finfo); |
| 74 | break; |
| 75 | } |
| 76 | if (result) { |
| 77 | PPRINTK("ncp_make_open: failed, result=%d\n", result); |
| 78 | goto out_unlock; |
| 79 | } |
| 80 | /* |
| 81 | * Update the inode information. |
| 82 | */ |
| 83 | update: |
| 84 | ncp_update_inode(inode, &finfo); |
| 85 | atomic_set(&NCP_FINFO(inode)->opened, 1); |
| 86 | } |
| 87 | |
| 88 | access = NCP_FINFO(inode)->access; |
| 89 | PPRINTK("ncp_make_open: file open, access=%x\n", access); |
| 90 | if (access == right || access == O_RDWR) { |
| 91 | atomic_inc(&NCP_FINFO(inode)->opened); |
| 92 | error = 0; |
| 93 | } |
| 94 | |
| 95 | out_unlock: |
Ingo Molnar | 8e3f904 | 2006-03-23 03:00:43 -0800 | [diff] [blame] | 96 | mutex_unlock(&NCP_FINFO(inode)->open_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | out: |
| 98 | return error; |
| 99 | } |
| 100 | |
| 101 | static ssize_t |
| 102 | ncp_file_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) |
| 103 | { |
| 104 | struct dentry *dentry = file->f_dentry; |
| 105 | struct inode *inode = dentry->d_inode; |
| 106 | size_t already_read = 0; |
| 107 | off_t pos; |
| 108 | size_t bufsize; |
| 109 | int error; |
| 110 | void* freepage; |
| 111 | size_t freelen; |
| 112 | |
| 113 | DPRINTK("ncp_file_read: enter %s/%s\n", |
| 114 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 115 | |
| 116 | if (!ncp_conn_valid(NCP_SERVER(inode))) |
| 117 | return -EIO; |
| 118 | |
| 119 | pos = *ppos; |
| 120 | |
| 121 | if ((ssize_t) count < 0) { |
| 122 | return -EINVAL; |
| 123 | } |
| 124 | if (!count) |
| 125 | return 0; |
| 126 | if (pos > inode->i_sb->s_maxbytes) |
| 127 | return 0; |
| 128 | if (pos + count > inode->i_sb->s_maxbytes) { |
| 129 | count = inode->i_sb->s_maxbytes - pos; |
| 130 | } |
| 131 | |
| 132 | error = ncp_make_open(inode, O_RDONLY); |
| 133 | if (error) { |
| 134 | DPRINTK(KERN_ERR "ncp_file_read: open failed, error=%d\n", error); |
| 135 | return error; |
| 136 | } |
| 137 | |
| 138 | bufsize = NCP_SERVER(inode)->buffer_size; |
| 139 | |
| 140 | error = -EIO; |
| 141 | freelen = ncp_read_bounce_size(bufsize); |
| 142 | freepage = vmalloc(freelen); |
| 143 | if (!freepage) |
| 144 | goto outrel; |
| 145 | error = 0; |
| 146 | /* First read in as much as possible for each bufsize. */ |
| 147 | while (already_read < count) { |
| 148 | int read_this_time; |
| 149 | size_t to_read = min_t(unsigned int, |
| 150 | bufsize - (pos % bufsize), |
| 151 | count - already_read); |
| 152 | |
| 153 | error = ncp_read_bounce(NCP_SERVER(inode), |
| 154 | NCP_FINFO(inode)->file_handle, |
| 155 | pos, to_read, buf, &read_this_time, |
| 156 | freepage, freelen); |
| 157 | if (error) { |
| 158 | error = -EIO; /* NW errno -> Linux errno */ |
| 159 | break; |
| 160 | } |
| 161 | pos += read_this_time; |
| 162 | buf += read_this_time; |
| 163 | already_read += read_this_time; |
| 164 | |
| 165 | if (read_this_time != to_read) { |
| 166 | break; |
| 167 | } |
| 168 | } |
| 169 | vfree(freepage); |
| 170 | |
| 171 | *ppos = pos; |
| 172 | |
| 173 | file_accessed(file); |
| 174 | |
| 175 | DPRINTK("ncp_file_read: exit %s/%s\n", |
| 176 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 177 | outrel: |
| 178 | ncp_inode_close(inode); |
| 179 | return already_read ? already_read : error; |
| 180 | } |
| 181 | |
| 182 | static ssize_t |
| 183 | ncp_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) |
| 184 | { |
| 185 | struct dentry *dentry = file->f_dentry; |
| 186 | struct inode *inode = dentry->d_inode; |
| 187 | size_t already_written = 0; |
| 188 | off_t pos; |
| 189 | size_t bufsize; |
| 190 | int errno; |
| 191 | void* bouncebuffer; |
| 192 | |
| 193 | DPRINTK("ncp_file_write: enter %s/%s\n", |
| 194 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 195 | if (!ncp_conn_valid(NCP_SERVER(inode))) |
| 196 | return -EIO; |
| 197 | if ((ssize_t) count < 0) |
| 198 | return -EINVAL; |
| 199 | pos = *ppos; |
| 200 | if (file->f_flags & O_APPEND) { |
| 201 | pos = inode->i_size; |
| 202 | } |
| 203 | |
| 204 | if (pos + count > MAX_NON_LFS && !(file->f_flags&O_LARGEFILE)) { |
| 205 | if (pos >= MAX_NON_LFS) { |
| 206 | send_sig(SIGXFSZ, current, 0); |
| 207 | return -EFBIG; |
| 208 | } |
| 209 | if (count > MAX_NON_LFS - (u32)pos) { |
| 210 | count = MAX_NON_LFS - (u32)pos; |
| 211 | } |
| 212 | } |
| 213 | if (pos >= inode->i_sb->s_maxbytes) { |
| 214 | if (count || pos > inode->i_sb->s_maxbytes) { |
| 215 | send_sig(SIGXFSZ, current, 0); |
| 216 | return -EFBIG; |
| 217 | } |
| 218 | } |
| 219 | if (pos + count > inode->i_sb->s_maxbytes) { |
| 220 | count = inode->i_sb->s_maxbytes - pos; |
| 221 | } |
| 222 | |
| 223 | if (!count) |
| 224 | return 0; |
| 225 | errno = ncp_make_open(inode, O_WRONLY); |
| 226 | if (errno) { |
| 227 | DPRINTK(KERN_ERR "ncp_file_write: open failed, error=%d\n", errno); |
| 228 | return errno; |
| 229 | } |
| 230 | bufsize = NCP_SERVER(inode)->buffer_size; |
| 231 | |
| 232 | already_written = 0; |
| 233 | |
| 234 | bouncebuffer = vmalloc(bufsize); |
| 235 | if (!bouncebuffer) { |
| 236 | errno = -EIO; /* -ENOMEM */ |
| 237 | goto outrel; |
| 238 | } |
| 239 | while (already_written < count) { |
| 240 | int written_this_time; |
| 241 | size_t to_write = min_t(unsigned int, |
| 242 | bufsize - (pos % bufsize), |
| 243 | count - already_written); |
| 244 | |
| 245 | if (copy_from_user(bouncebuffer, buf, to_write)) { |
| 246 | errno = -EFAULT; |
| 247 | break; |
| 248 | } |
| 249 | if (ncp_write_kernel(NCP_SERVER(inode), |
| 250 | NCP_FINFO(inode)->file_handle, |
| 251 | pos, to_write, bouncebuffer, &written_this_time) != 0) { |
| 252 | errno = -EIO; |
| 253 | break; |
| 254 | } |
| 255 | pos += written_this_time; |
| 256 | buf += written_this_time; |
| 257 | already_written += written_this_time; |
| 258 | |
| 259 | if (written_this_time != to_write) { |
| 260 | break; |
| 261 | } |
| 262 | } |
| 263 | vfree(bouncebuffer); |
| 264 | |
Christoph Hellwig | 870f481 | 2006-01-09 20:52:01 -0800 | [diff] [blame] | 265 | file_update_time(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | |
| 267 | *ppos = pos; |
| 268 | |
| 269 | if (pos > inode->i_size) { |
| 270 | inode->i_size = pos; |
| 271 | } |
| 272 | DPRINTK("ncp_file_write: exit %s/%s\n", |
| 273 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 274 | outrel: |
| 275 | ncp_inode_close(inode); |
| 276 | return already_written ? already_written : errno; |
| 277 | } |
| 278 | |
| 279 | static int ncp_release(struct inode *inode, struct file *file) { |
| 280 | if (ncp_make_closed(inode)) { |
| 281 | DPRINTK("ncp_release: failed to close\n"); |
| 282 | } |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | struct file_operations ncp_file_operations = |
| 287 | { |
| 288 | .llseek = remote_llseek, |
| 289 | .read = ncp_file_read, |
| 290 | .write = ncp_file_write, |
| 291 | .ioctl = ncp_ioctl, |
| 292 | .mmap = ncp_mmap, |
| 293 | .release = ncp_release, |
| 294 | .fsync = ncp_fsync, |
| 295 | }; |
| 296 | |
| 297 | struct inode_operations ncp_file_inode_operations = |
| 298 | { |
| 299 | .setattr = ncp_notify_change, |
| 300 | }; |