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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 | /* * file.c * * Copyright (C) 1995 by Paal-Kr. Engstad and Volker Lendecke * */ #include <asm/segment.h> #include <asm/system.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/fcntl.h> #include <linux/stat.h> #include <linux/mm.h> #include <linux/smb_fs.h> #include <linux/malloc.h> static inline int min(int a, int b) { return a<b ? a : b; } static int smb_fsync(struct inode *inode, struct file *file) { return 0; } int smb_make_open(struct inode *i, int right) { struct smb_dirent *dirent; int open_result; if (i == NULL) { printk("smb_make_open: got NULL inode\n"); return -EINVAL; } dirent = &(SMB_INOP(i)->finfo); DDPRINTK("smb_make_open: dirent->opened = %d\n", dirent->opened); if ((dirent->opened) == 0) { /* tries max. rights */ open_result = smb_proc_open(SMB_SERVER(i), dirent->path, dirent->len, dirent); if (open_result) return open_result; dirent->opened = 1; } if ( ((right == O_RDONLY) && ( (dirent->access == O_RDONLY) || (dirent->access == O_RDWR))) || ((right == O_WRONLY) && ( (dirent->access == O_WRONLY) || (dirent->access == O_RDWR))) || ((right == O_RDWR) && (dirent->access == O_RDWR))) return 0; return -EACCES; } static int smb_file_read(struct inode *inode, struct file *file, char *buf, int count) { int result, bufsize, to_read, already_read; off_t pos; int errno; DPRINTK("smb_file_read: enter %s\n", SMB_FINFO(inode)->path); if (!inode) { DPRINTK("smb_file_read: inode = NULL\n"); return -EINVAL; } if (!S_ISREG(inode->i_mode)) { DPRINTK("smb_file_read: read from non-file, mode %07o\n", inode->i_mode); return -EINVAL; } if ((errno = smb_make_open(inode, O_RDONLY)) != 0) return errno; pos = file->f_pos; if (pos + count > inode->i_size) count = inode->i_size - pos; if (count <= 0) return 0; bufsize = SMB_SERVER(inode)->max_xmit - SMB_HEADER_LEN - 5 * 2 - 5; already_read = 0; /* First read in as much as possible for each bufsize. */ while (already_read < count) { result = 0; to_read = 0; if ((SMB_SERVER(inode)->blkmode & 1) != 0) { to_read = min(65535, count - already_read); DPRINTK("smb_file_read: Raw %d bytes\n", to_read); result = smb_proc_read_raw(SMB_SERVER(inode), SMB_FINFO(inode), pos, to_read, buf); DPRINTK("smb_file_read: returned %d\n", result); } if (result <= 0) { to_read = min(bufsize, count - already_read); result = smb_proc_read(SMB_SERVER(inode), SMB_FINFO(inode), pos, to_read, buf, 1); } if (result < 0) return result; pos += result; buf += result; already_read += result; if (result < to_read) { break; } } file->f_pos = pos; if (!IS_RDONLY(inode)) inode->i_atime = CURRENT_TIME; inode->i_dirt = 1; DPRINTK("smb_file_read: exit %s\n", SMB_FINFO(inode)->path); return already_read; } static int smb_file_write(struct inode *inode, struct file *file, const char *buf, int count) { int result, bufsize, to_write, already_written; off_t pos; int errno; if (!inode) { DPRINTK("smb_file_write: inode = NULL\n"); return -EINVAL; } if (!S_ISREG(inode->i_mode)) { DPRINTK("smb_file_write: write to non-file, mode %07o\n", inode->i_mode); return -EINVAL; } DPRINTK("smb_file_write: enter %s\n", SMB_FINFO(inode)->path); if (count <= 0) return 0; if ((errno = smb_make_open(inode, O_RDWR)) != 0) return errno; pos = file->f_pos; if (file->f_flags & O_APPEND) pos = inode->i_size; bufsize = SMB_SERVER(inode)->max_xmit - SMB_HEADER_LEN - 5 * 2 - 5; already_written = 0; DPRINTK("smb_write_file: blkmode = %d, blkmode & 2 = %d\n", SMB_SERVER(inode)->blkmode, SMB_SERVER(inode)->blkmode & 2); while (already_written < count) { result = 0; to_write = 0; if ((SMB_SERVER(inode)->blkmode & 2) != 0) { to_write = min(65535, count - already_written); DPRINTK("smb_file_write: Raw %d bytes\n", to_write); result = smb_proc_write_raw(SMB_SERVER(inode), SMB_FINFO(inode), pos, to_write, buf); DPRINTK("smb_file_write: returned %d\n", result); } if (result <= 0) { to_write = min(bufsize, count - already_written); result = smb_proc_write(SMB_SERVER(inode), SMB_FINFO(inode), pos, to_write, buf); } if (result < 0) return result; pos += result; buf += result; already_written += result; if (result < to_write) { break; } } inode->i_mtime = inode->i_ctime = CURRENT_TIME; inode->i_dirt = 1; file->f_pos = pos; if (pos > inode->i_size) { inode->i_size = pos; } DPRINTK("smb_file_write: exit %s\n", SMB_FINFO(inode)->path); return already_written; } static struct file_operations smb_file_operations = { NULL, /* lseek - default */ smb_file_read, /* read */ smb_file_write, /* write */ NULL, /* readdir - bad */ NULL, /* select - default */ smb_ioctl, /* ioctl */ smb_mmap, /* mmap */ NULL, /* open */ NULL, /* release */ smb_fsync, /* fsync */ }; struct inode_operations smb_file_inode_operations = { &smb_file_operations, /* default file operations */ NULL, /* create */ NULL, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ NULL, /* readlink */ NULL, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL /* truncate */ }; /* * Overrides for Emacs so that we follow Linus's tabbing style. * Emacs will notice this stuff at the end of the file and automatically * adjust the settings for this buffer only. This must remain at the end * of the file. * --------------------------------------------------------------------------- * Local variables: * c-indent-level: 8 * c-brace-imaginary-offset: 0 * c-brace-offset: -8 * c-argdecl-indent: 8 * c-label-offset: -8 * c-continued-statement-offset: 8 * c-continued-brace-offset: 0 * End: */ |