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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 | /* * File operations for Coda. * Original version: (C) 1996 Peter Braam * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University * * Carnegie Mellon encourages users of this code to contribute improvements * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>. */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/fs.h> #include <linux/stat.h> #include <linux/errno.h> #include <linux/locks.h> #include <asm/segment.h> #include <linux/string.h> #include <asm/uaccess.h> #include <linux/coda.h> #include <linux/coda_linux.h> #include <linux/coda_fs_i.h> #include <linux/coda_psdev.h> #include <linux/coda_cache.h> #include <linux/coda_proc.h> /* file operations */ static int coda_readpage(struct file *file, struct page * page); static ssize_t coda_file_read(struct file *f, char *buf, size_t count, loff_t *off); static ssize_t coda_file_write(struct file *f, const char *buf, size_t count, loff_t *off); static int coda_file_mmap(struct file * file, struct vm_area_struct * vma); /* also exported from this file (used for dirs) */ int coda_fsync(struct file *, struct dentry *dentry); struct inode_operations coda_file_inode_operations = { &coda_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 */ coda_readpage, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ coda_permission, /* permission */ NULL, /* smap */ NULL, /* update page */ coda_revalidate_inode /* revalidate */ }; struct file_operations coda_file_operations = { NULL, /* lseek - default should work for coda */ coda_file_read, /* read */ coda_file_write, /* write */ NULL, /* readdir */ NULL, /* select - default */ NULL, /* ioctl */ coda_file_mmap, /* mmap */ coda_open, /* open */ NULL, coda_release, /* release */ coda_fsync, /* fsync */ NULL, /* fasync */ NULL, /* check_media_change */ NULL, /* revalidate */ NULL /* lock */ }; /* File file operations */ static int coda_readpage(struct file * coda_file, struct page * page) { struct dentry *de = coda_file->f_dentry; struct inode *coda_inode = de->d_inode; struct dentry cont_dentry; struct file cont_file; struct coda_inode_info *cii; ENTRY; coda_vfs_stat.readpage++; cii = ITOC(coda_inode); if ( ! cii->c_ovp ) { printk("coda_readpage: no open inode for ino %ld, %s\n", coda_inode->i_ino, de->d_name.name); return -ENXIO; } coda_prepare_openfile(coda_inode, coda_file, cii->c_ovp, &cont_file, &cont_dentry); CDEBUG(D_INODE, "coda ino: %ld, cached ino %ld, page offset: %lx\n", coda_inode->i_ino, cii->c_ovp->i_ino, page->offset); generic_readpage(&cont_file, page); EXIT; return 0; } static int coda_file_mmap(struct file * file, struct vm_area_struct * vma) { struct coda_inode_info *cii; int res; coda_vfs_stat.file_mmap++; ENTRY; cii = ITOC(file->f_dentry->d_inode); res =generic_file_mmap(file, vma); EXIT; return res; } static ssize_t coda_file_read(struct file *coda_file, char *buff, size_t count, loff_t *ppos) { struct coda_inode_info *cnp; struct inode *coda_inode = coda_file->f_dentry->d_inode; struct inode *cont_inode = NULL; struct file cont_file; struct dentry cont_dentry; int result = 0; ENTRY; coda_vfs_stat.file_read++; cnp = ITOC(coda_inode); cont_inode = cnp->c_ovp; if ( cont_inode == NULL ) { printk("coda_file_read: cached inode is 0!\n"); return -1; } coda_prepare_openfile(coda_inode, coda_file, cont_inode, &cont_file, &cont_dentry); if (!cont_file.f_op || ! cont_file.f_op->read) { printk( "container file has no read in file operations.\n"); return -1; } result = cont_file.f_op->read(&cont_file , buff, count, &(cont_file.f_pos)); CDEBUG(D_FILE, "ops at %p result %d, count %ld, position: %d\n", cont_file.f_op, result, (long)count, (int)cont_file.f_pos); coda_restore_codafile(coda_inode, coda_file, cont_inode, &cont_file); return result; } static ssize_t coda_file_write(struct file *coda_file, const char *buff, size_t count, loff_t *ppos) { struct coda_inode_info *cnp; struct inode *coda_inode = coda_file->f_dentry->d_inode; struct inode *cont_inode = NULL; struct file cont_file; struct dentry cont_dentry; int result = 0; ENTRY; coda_vfs_stat.file_write++; cnp = ITOC(coda_inode); cont_inode = cnp->c_ovp; if ( cont_inode == NULL ) { printk("coda_file_write: cached inode is 0!\n"); return -1; } coda_prepare_openfile(coda_inode, coda_file, cont_inode, &cont_file, &cont_dentry); if (!cont_file.f_op || !cont_file.f_op->write) { printk("coda_file_write: container file has no file ops.\n"); return -1; } down(&cont_inode->i_sem); result = cont_file.f_op->write(&cont_file , buff, count, &(cont_file.f_pos)); up(&cont_inode->i_sem); coda_restore_codafile(coda_inode, coda_file, cont_inode, &cont_file); if (result) cnp->c_flags |= C_VATTR; return result; } int coda_fsync(struct file *coda_file, struct dentry *coda_dentry) { struct coda_inode_info *cnp; struct inode *coda_inode = coda_dentry->d_inode; struct inode *cont_inode = NULL; struct file cont_file; struct dentry cont_dentry; int result = 0; ENTRY; coda_vfs_stat.fsync++; if (!(S_ISREG(coda_inode->i_mode) || S_ISDIR(coda_inode->i_mode) || S_ISLNK(coda_inode->i_mode))) return -EINVAL; cnp = ITOC(coda_inode); cont_inode = cnp->c_ovp; if ( cont_inode == NULL ) { printk("coda_file_write: cached inode is 0!\n"); return -1; } coda_prepare_openfile(coda_inode, coda_file, cont_inode, &cont_file, &cont_dentry); down(&cont_inode->i_sem); result = file_fsync(&cont_file ,&cont_dentry); if ( result == 0 ) { result = venus_fsync(coda_inode->i_sb, &(cnp->c_fid)); } up(&cont_inode->i_sem); coda_restore_codafile(coda_inode, coda_file, cont_inode, &cont_file); return result; } /* * support routines */ /* instantiate the container file and dentry object to do io */ void coda_prepare_openfile(struct inode *i, struct file *coda_file, struct inode *cont_inode, struct file *cont_file, struct dentry *cont_dentry) { cont_file->f_pos = coda_file->f_pos; cont_file->f_mode = coda_file->f_mode; cont_file->f_flags = coda_file->f_flags; cont_file->f_count = coda_file->f_count; cont_file->f_owner = coda_file->f_owner; cont_file->f_op = cont_inode->i_op->default_file_ops; cont_file->f_dentry = cont_dentry; cont_file->f_dentry->d_inode = cont_inode; return ; } /* update the Coda file & inode after I/O */ void coda_restore_codafile(struct inode *coda_inode, struct file *coda_file, struct inode *open_inode, struct file *open_file) { coda_file->f_pos = open_file->f_pos; /* XXX what about setting the mtime here too? */ /* coda_inode->i_mtime = open_inode->i_mtime; */ coda_inode->i_size = open_inode->i_size; return; } /* grab the ext2 inode of the container file */ int coda_inode_grab(dev_t dev, ino_t ino, struct inode **ind) { struct super_block *sbptr; sbptr = get_super(dev); if ( !sbptr ) { printk("coda_inode_grab: coda_find_super returns NULL.\n"); return -ENXIO; } *ind = NULL; *ind = iget(sbptr, ino); if ( *ind == NULL ) { printk("coda_inode_grab: iget(dev: %d, ino: %ld) returns NULL.\n", dev, (long)ino); return -ENOENT; } CDEBUG(D_FILE, "ino: %ld, ops at %p\n", (long)ino, (*ind)->i_op); return 0; } |