11da177e4SLinus Torvalds 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * Directory operations for Coda filesystem 41da177e4SLinus Torvalds * Original version: (C) 1996 P. Braam and M. Callahan 51da177e4SLinus Torvalds * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * Carnegie Mellon encourages users to contribute improvements to 81da177e4SLinus Torvalds * the Coda project. Contact Peter Braam (coda@cs.cmu.edu). 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds #include <linux/types.h> 121da177e4SLinus Torvalds #include <linux/kernel.h> 131da177e4SLinus Torvalds #include <linux/time.h> 141da177e4SLinus Torvalds #include <linux/fs.h> 155a0e3ad6STejun Heo #include <linux/slab.h> 161da177e4SLinus Torvalds #include <linux/file.h> 171da177e4SLinus Torvalds #include <linux/stat.h> 181da177e4SLinus Torvalds #include <linux/errno.h> 191da177e4SLinus Torvalds #include <linux/string.h> 20b5ce1d83SYoshihisa Abe #include <linux/spinlock.h> 2134286d66SNick Piggin #include <linux/namei.h> 22834b46c3SFabian Frederick #include <linux/uaccess.h> 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds #include <linux/coda.h> 251da177e4SLinus Torvalds #include <linux/coda_psdev.h> 2631a203dfSAl Viro #include "coda_linux.h" 2731a203dfSAl Viro #include "coda_cache.h" 281da177e4SLinus Torvalds 29c98d8cfbSAdrian Bunk #include "coda_int.h" 30c98d8cfbSAdrian Bunk 311da177e4SLinus Torvalds /* dir inode-ops */ 32ebfc3b49SAl Viro static int coda_create(struct inode *dir, struct dentry *new, umode_t mode, bool excl); 3300cd8dd3SAl Viro static struct dentry *coda_lookup(struct inode *dir, struct dentry *target, unsigned int flags); 341da177e4SLinus Torvalds static int coda_link(struct dentry *old_dentry, struct inode *dir_inode, 351da177e4SLinus Torvalds struct dentry *entry); 361da177e4SLinus Torvalds static int coda_unlink(struct inode *dir_inode, struct dentry *entry); 371da177e4SLinus Torvalds static int coda_symlink(struct inode *dir_inode, struct dentry *entry, 381da177e4SLinus Torvalds const char *symname); 3918bb1db3SAl Viro static int coda_mkdir(struct inode *dir_inode, struct dentry *entry, umode_t mode); 401da177e4SLinus Torvalds static int coda_rmdir(struct inode *dir_inode, struct dentry *entry); 411da177e4SLinus Torvalds static int coda_rename(struct inode *old_inode, struct dentry *old_dentry, 421da177e4SLinus Torvalds struct inode *new_inode, struct dentry *new_dentry); 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds /* dir file-ops */ 45e924f251SAl Viro static int coda_readdir(struct file *file, struct dir_context *ctx); 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds /* dentry ops */ 480b728e19SAl Viro static int coda_dentry_revalidate(struct dentry *de, unsigned int flags); 49fe15ce44SNick Piggin static int coda_dentry_delete(const struct dentry *); 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds /* support routines */ 52e924f251SAl Viro static int coda_venus_readdir(struct file *, struct dir_context *); 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds /* same as fs/bad_inode.c */ 551da177e4SLinus Torvalds static int coda_return_EIO(void) 561da177e4SLinus Torvalds { 571da177e4SLinus Torvalds return -EIO; 581da177e4SLinus Torvalds } 591da177e4SLinus Torvalds #define CODA_EIO_ERROR ((void *) (coda_return_EIO)) 601da177e4SLinus Torvalds 619501e4c4SAl Viro const struct dentry_operations coda_dentry_operations = 621da177e4SLinus Torvalds { 631da177e4SLinus Torvalds .d_revalidate = coda_dentry_revalidate, 641da177e4SLinus Torvalds .d_delete = coda_dentry_delete, 651da177e4SLinus Torvalds }; 661da177e4SLinus Torvalds 67754661f1SArjan van de Ven const struct inode_operations coda_dir_inode_operations = 681da177e4SLinus Torvalds { 691da177e4SLinus Torvalds .create = coda_create, 701da177e4SLinus Torvalds .lookup = coda_lookup, 711da177e4SLinus Torvalds .link = coda_link, 721da177e4SLinus Torvalds .unlink = coda_unlink, 731da177e4SLinus Torvalds .symlink = coda_symlink, 741da177e4SLinus Torvalds .mkdir = coda_mkdir, 751da177e4SLinus Torvalds .rmdir = coda_rmdir, 761da177e4SLinus Torvalds .mknod = CODA_EIO_ERROR, 771da177e4SLinus Torvalds .rename = coda_rename, 781da177e4SLinus Torvalds .permission = coda_permission, 791da177e4SLinus Torvalds .getattr = coda_getattr, 801da177e4SLinus Torvalds .setattr = coda_setattr, 811da177e4SLinus Torvalds }; 821da177e4SLinus Torvalds 834b6f5d20SArjan van de Ven const struct file_operations coda_dir_operations = { 841da177e4SLinus Torvalds .llseek = generic_file_llseek, 851da177e4SLinus Torvalds .read = generic_read_dir, 86e924f251SAl Viro .iterate = coda_readdir, 871da177e4SLinus Torvalds .open = coda_open, 881da177e4SLinus Torvalds .release = coda_release, 891da177e4SLinus Torvalds .fsync = coda_fsync, 901da177e4SLinus Torvalds }; 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds /* inode operations for directories */ 941da177e4SLinus Torvalds /* access routines: lookup, readlink, permission */ 9500cd8dd3SAl Viro static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, unsigned int flags) 961da177e4SLinus Torvalds { 97f4947fbcSAl Viro struct super_block *sb = dir->i_sb; 981da177e4SLinus Torvalds const char *name = entry->d_name.name; 991da177e4SLinus Torvalds size_t length = entry->d_name.len; 100f4947fbcSAl Viro struct inode *inode; 101f4947fbcSAl Viro int type = 0; 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds if (length > CODA_MAXNAMLEN) { 104d9b4b319SFabian Frederick pr_err("name too long: lookup, %s (%*s)\n", 1051da177e4SLinus Torvalds coda_i2s(dir), (int)length, name); 1061da177e4SLinus Torvalds return ERR_PTR(-ENAMETOOLONG); 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds /* control object, create inode on the fly */ 110a7400222SAl Viro if (is_root_inode(dir) && coda_iscontrol(name, length)) { 111f4947fbcSAl Viro inode = coda_cnode_makectl(sb); 112ed36f723SJan Harkes type = CODA_NOCACHE; 113f4947fbcSAl Viro } else { 114f4947fbcSAl Viro struct CodaFid fid = { { 0, } }; 115f4947fbcSAl Viro int error = venus_lookup(sb, coda_i2f(dir), name, length, 116f4947fbcSAl Viro &type, &fid); 117f4947fbcSAl Viro inode = !error ? coda_cnode_make(&fid, sb) : ERR_PTR(error); 1181da177e4SLinus Torvalds } 1191da177e4SLinus Torvalds 120f4947fbcSAl Viro if (!IS_ERR(inode) && (type & CODA_NOCACHE)) 121ed36f723SJan Harkes coda_flag_inode(inode, C_VATTR | C_PURGE); 122ed36f723SJan Harkes 123f4947fbcSAl Viro if (inode == ERR_PTR(-ENOENT)) 124f4947fbcSAl Viro inode = NULL; 125f4947fbcSAl Viro 126ed36f723SJan Harkes return d_splice_alias(inode, entry); 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds 13010556cb2SAl Viro int coda_permission(struct inode *inode, int mask) 1311da177e4SLinus Torvalds { 132f7cc02b8SYoshihisa Abe int error; 1331da177e4SLinus Torvalds 13410556cb2SAl Viro if (mask & MAY_NOT_BLOCK) 135b74c79e9SNick Piggin return -ECHILD; 136b74c79e9SNick Piggin 137e6305c43SAl Viro mask &= MAY_READ | MAY_WRITE | MAY_EXEC; 138e6305c43SAl Viro 1391da177e4SLinus Torvalds if (!mask) 1401da177e4SLinus Torvalds return 0; 1411da177e4SLinus Torvalds 142f696a365SMiklos Szeredi if ((mask & MAY_EXEC) && !execute_ok(inode)) 143f696a365SMiklos Szeredi return -EACCES; 144f696a365SMiklos Szeredi 1451da177e4SLinus Torvalds if (coda_cache_check(inode, mask)) 146f7cc02b8SYoshihisa Abe return 0; 1471da177e4SLinus Torvalds 1481da177e4SLinus Torvalds error = venus_access(inode->i_sb, coda_i2f(inode), mask); 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds if (!error) 1511da177e4SLinus Torvalds coda_cache_enter(inode, mask); 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds return error; 1541da177e4SLinus Torvalds } 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds 157d728900cSJan Harkes static inline void coda_dir_update_mtime(struct inode *dir) 1581da177e4SLinus Torvalds { 1591da177e4SLinus Torvalds #ifdef REQUERY_VENUS_FOR_MTIME 1601da177e4SLinus Torvalds /* invalidate the directory cnode's attributes so we refetch the 1611da177e4SLinus Torvalds * attributes from venus next time the inode is referenced */ 1621da177e4SLinus Torvalds coda_flag_inode(dir, C_VATTR); 1631da177e4SLinus Torvalds #else 1641da177e4SLinus Torvalds /* optimistically we can also act as if our nose bleeds. The 1651da177e4SLinus Torvalds * granularity of the mtime is coarse anyways so we might actually be 1661da177e4SLinus Torvalds * right most of the time. Note: we only do this for directories. */ 1671da177e4SLinus Torvalds dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC; 1681da177e4SLinus Torvalds #endif 169d728900cSJan Harkes } 170d728900cSJan Harkes 171d728900cSJan Harkes /* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a 172d728900cSJan Harkes * trick to fool GNU find's optimizations. If we can't be sure of the link 173d728900cSJan Harkes * (because of volume mount points) we set i_nlink to 1 which forces find 174d728900cSJan Harkes * to consider every child as a possible directory. We should also never 175d728900cSJan Harkes * see an increment or decrement for deleted directories where i_nlink == 0 */ 176d728900cSJan Harkes static inline void coda_dir_inc_nlink(struct inode *dir) 177d728900cSJan Harkes { 178d728900cSJan Harkes if (dir->i_nlink >= 2) 179d728900cSJan Harkes inc_nlink(dir); 180d728900cSJan Harkes } 181d728900cSJan Harkes 182d728900cSJan Harkes static inline void coda_dir_drop_nlink(struct inode *dir) 183d728900cSJan Harkes { 184d728900cSJan Harkes if (dir->i_nlink > 2) 185d728900cSJan Harkes drop_nlink(dir); 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds /* creation routines: create, mknod, mkdir, link, symlink */ 189ebfc3b49SAl Viro static int coda_create(struct inode *dir, struct dentry *de, umode_t mode, bool excl) 1901da177e4SLinus Torvalds { 191f7cc02b8SYoshihisa Abe int error; 1921da177e4SLinus Torvalds const char *name=de->d_name.name; 1931da177e4SLinus Torvalds int length=de->d_name.len; 1941da177e4SLinus Torvalds struct inode *inode; 1951da177e4SLinus Torvalds struct CodaFid newfid; 1961da177e4SLinus Torvalds struct coda_vattr attrs; 1971da177e4SLinus Torvalds 198a7400222SAl Viro if (is_root_inode(dir) && coda_iscontrol(name, length)) 1991da177e4SLinus Torvalds return -EPERM; 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds error = venus_create(dir->i_sb, coda_i2f(dir), name, length, 2021da177e4SLinus Torvalds 0, mode, &newfid, &attrs); 203f7cc02b8SYoshihisa Abe if (error) 204f7cc02b8SYoshihisa Abe goto err_out; 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds inode = coda_iget(dir->i_sb, &newfid, &attrs); 2071da177e4SLinus Torvalds if (IS_ERR(inode)) { 208f7cc02b8SYoshihisa Abe error = PTR_ERR(inode); 209f7cc02b8SYoshihisa Abe goto err_out; 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds /* invalidate the directory cnode's attributes */ 213d728900cSJan Harkes coda_dir_update_mtime(dir); 2141da177e4SLinus Torvalds d_instantiate(de, inode); 2151da177e4SLinus Torvalds return 0; 216f7cc02b8SYoshihisa Abe err_out: 217f7cc02b8SYoshihisa Abe d_drop(de); 218f7cc02b8SYoshihisa Abe return error; 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds 22118bb1db3SAl Viro static int coda_mkdir(struct inode *dir, struct dentry *de, umode_t mode) 2221da177e4SLinus Torvalds { 2231da177e4SLinus Torvalds struct inode *inode; 2241da177e4SLinus Torvalds struct coda_vattr attrs; 2251da177e4SLinus Torvalds const char *name = de->d_name.name; 2261da177e4SLinus Torvalds int len = de->d_name.len; 2271da177e4SLinus Torvalds int error; 2281da177e4SLinus Torvalds struct CodaFid newfid; 2291da177e4SLinus Torvalds 230a7400222SAl Viro if (is_root_inode(dir) && coda_iscontrol(name, len)) 2311da177e4SLinus Torvalds return -EPERM; 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds attrs.va_mode = mode; 2341da177e4SLinus Torvalds error = venus_mkdir(dir->i_sb, coda_i2f(dir), 2351da177e4SLinus Torvalds name, len, &newfid, &attrs); 236f7cc02b8SYoshihisa Abe if (error) 237f7cc02b8SYoshihisa Abe goto err_out; 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds inode = coda_iget(dir->i_sb, &newfid, &attrs); 2401da177e4SLinus Torvalds if (IS_ERR(inode)) { 241f7cc02b8SYoshihisa Abe error = PTR_ERR(inode); 242f7cc02b8SYoshihisa Abe goto err_out; 2431da177e4SLinus Torvalds } 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds /* invalidate the directory cnode's attributes */ 246d728900cSJan Harkes coda_dir_inc_nlink(dir); 247d728900cSJan Harkes coda_dir_update_mtime(dir); 2481da177e4SLinus Torvalds d_instantiate(de, inode); 2491da177e4SLinus Torvalds return 0; 250f7cc02b8SYoshihisa Abe err_out: 251f7cc02b8SYoshihisa Abe d_drop(de); 252f7cc02b8SYoshihisa Abe return error; 2531da177e4SLinus Torvalds } 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds /* try to make de an entry in dir_inodde linked to source_de */ 2561da177e4SLinus Torvalds static int coda_link(struct dentry *source_de, struct inode *dir_inode, 2571da177e4SLinus Torvalds struct dentry *de) 2581da177e4SLinus Torvalds { 2591da177e4SLinus Torvalds struct inode *inode = source_de->d_inode; 2601da177e4SLinus Torvalds const char * name = de->d_name.name; 2611da177e4SLinus Torvalds int len = de->d_name.len; 2621da177e4SLinus Torvalds int error; 2631da177e4SLinus Torvalds 264a7400222SAl Viro if (is_root_inode(dir_inode) && coda_iscontrol(name, len)) 2651da177e4SLinus Torvalds return -EPERM; 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds error = venus_link(dir_inode->i_sb, coda_i2f(inode), 2681da177e4SLinus Torvalds coda_i2f(dir_inode), (const char *)name, len); 2691da177e4SLinus Torvalds if (error) { 2701da177e4SLinus Torvalds d_drop(de); 271f7cc02b8SYoshihisa Abe return error; 2721da177e4SLinus Torvalds } 2731da177e4SLinus Torvalds 274d728900cSJan Harkes coda_dir_update_mtime(dir_inode); 2757de9c6eeSAl Viro ihold(inode); 2761da177e4SLinus Torvalds d_instantiate(de, inode); 277d8c76e6fSDave Hansen inc_nlink(inode); 278f7cc02b8SYoshihisa Abe return 0; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds static int coda_symlink(struct inode *dir_inode, struct dentry *de, 2831da177e4SLinus Torvalds const char *symname) 2841da177e4SLinus Torvalds { 2851da177e4SLinus Torvalds const char *name = de->d_name.name; 2861da177e4SLinus Torvalds int len = de->d_name.len; 2871da177e4SLinus Torvalds int symlen; 288f7cc02b8SYoshihisa Abe int error; 2891da177e4SLinus Torvalds 290a7400222SAl Viro if (is_root_inode(dir_inode) && coda_iscontrol(name, len)) 2911da177e4SLinus Torvalds return -EPERM; 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds symlen = strlen(symname); 294f7cc02b8SYoshihisa Abe if (symlen > CODA_MAXPATHLEN) 2951da177e4SLinus Torvalds return -ENAMETOOLONG; 2961da177e4SLinus Torvalds 2971da177e4SLinus Torvalds /* 2981da177e4SLinus Torvalds * This entry is now negative. Since we do not create 2991da177e4SLinus Torvalds * an inode for the entry we have to drop it. 3001da177e4SLinus Torvalds */ 3011da177e4SLinus Torvalds d_drop(de); 3021da177e4SLinus Torvalds error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len, 3031da177e4SLinus Torvalds symname, symlen); 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds /* mtime is no good anymore */ 3061da177e4SLinus Torvalds if (!error) 307d728900cSJan Harkes coda_dir_update_mtime(dir_inode); 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds return error; 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds /* destruction routines: unlink, rmdir */ 3139fe76c76SHarvey Harrison static int coda_unlink(struct inode *dir, struct dentry *de) 3141da177e4SLinus Torvalds { 3151da177e4SLinus Torvalds int error; 3161da177e4SLinus Torvalds const char *name = de->d_name.name; 3171da177e4SLinus Torvalds int len = de->d_name.len; 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds error = venus_remove(dir->i_sb, coda_i2f(dir), name, len); 320f7cc02b8SYoshihisa Abe if (error) 3211da177e4SLinus Torvalds return error; 3221da177e4SLinus Torvalds 323d728900cSJan Harkes coda_dir_update_mtime(dir); 3249a53c3a7SDave Hansen drop_nlink(de->d_inode); 3251da177e4SLinus Torvalds return 0; 3261da177e4SLinus Torvalds } 3271da177e4SLinus Torvalds 3289fe76c76SHarvey Harrison static int coda_rmdir(struct inode *dir, struct dentry *de) 3291da177e4SLinus Torvalds { 3301da177e4SLinus Torvalds const char *name = de->d_name.name; 3311da177e4SLinus Torvalds int len = de->d_name.len; 3321da177e4SLinus Torvalds int error; 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len); 3358c6d2152SJan Harkes if (!error) { 3368c6d2152SJan Harkes /* VFS may delete the child */ 3378c6d2152SJan Harkes if (de->d_inode) 3386d6b77f1SMiklos Szeredi clear_nlink(de->d_inode); 3391da177e4SLinus Torvalds 3408c6d2152SJan Harkes /* fix the link count of the parent */ 341d728900cSJan Harkes coda_dir_drop_nlink(dir); 342d728900cSJan Harkes coda_dir_update_mtime(dir); 3438c6d2152SJan Harkes } 3448c6d2152SJan Harkes return error; 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds /* rename */ 3481da177e4SLinus Torvalds static int coda_rename(struct inode *old_dir, struct dentry *old_dentry, 3491da177e4SLinus Torvalds struct inode *new_dir, struct dentry *new_dentry) 3501da177e4SLinus Torvalds { 3511da177e4SLinus Torvalds const char *old_name = old_dentry->d_name.name; 3521da177e4SLinus Torvalds const char *new_name = new_dentry->d_name.name; 3531da177e4SLinus Torvalds int old_length = old_dentry->d_name.len; 3541da177e4SLinus Torvalds int new_length = new_dentry->d_name.len; 3551da177e4SLinus Torvalds int error; 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds error = venus_rename(old_dir->i_sb, coda_i2f(old_dir), 3581da177e4SLinus Torvalds coda_i2f(new_dir), old_length, new_length, 3591da177e4SLinus Torvalds (const char *) old_name, (const char *)new_name); 3601da177e4SLinus Torvalds if (!error) { 3611da177e4SLinus Torvalds if (new_dentry->d_inode) { 362d728900cSJan Harkes if (S_ISDIR(new_dentry->d_inode->i_mode)) { 363d728900cSJan Harkes coda_dir_drop_nlink(old_dir); 364d728900cSJan Harkes coda_dir_inc_nlink(new_dir); 365d728900cSJan Harkes } 366d728900cSJan Harkes coda_dir_update_mtime(old_dir); 367d728900cSJan Harkes coda_dir_update_mtime(new_dir); 3681da177e4SLinus Torvalds coda_flag_inode(new_dentry->d_inode, C_VATTR); 3691da177e4SLinus Torvalds } else { 3701da177e4SLinus Torvalds coda_flag_inode(old_dir, C_VATTR); 3711da177e4SLinus Torvalds coda_flag_inode(new_dir, C_VATTR); 3721da177e4SLinus Torvalds } 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds return error; 3751da177e4SLinus Torvalds } 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds /* file operations for directories */ 379e924f251SAl Viro static int coda_readdir(struct file *coda_file, struct dir_context *ctx) 3801da177e4SLinus Torvalds { 3811da177e4SLinus Torvalds struct coda_file_info *cfi; 3821da177e4SLinus Torvalds struct file *host_file; 3831da177e4SLinus Torvalds int ret; 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds cfi = CODA_FTOC(coda_file); 3861da177e4SLinus Torvalds BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); 3871da177e4SLinus Torvalds host_file = cfi->cfi_container; 3881da177e4SLinus Torvalds 389e924f251SAl Viro if (host_file->f_op->iterate) { 390496ad9aaSAl Viro struct inode *host_inode = file_inode(host_file); 391bb6f619bSAl Viro mutex_lock(&host_inode->i_mutex); 392bb6f619bSAl Viro ret = -ENOENT; 393bb6f619bSAl Viro if (!IS_DEADDIR(host_inode)) { 394bb6f619bSAl Viro ret = host_file->f_op->iterate(host_file, ctx); 395bb6f619bSAl Viro file_accessed(host_file); 39697875253SJan Harkes } 397bb6f619bSAl Viro mutex_unlock(&host_inode->i_mutex); 3981da177e4SLinus Torvalds return ret; 3991da177e4SLinus Torvalds } 400e924f251SAl Viro /* Venus: we must read Venus dirents from a file */ 401e924f251SAl Viro return coda_venus_readdir(coda_file, ctx); 402e924f251SAl Viro } 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds static inline unsigned int CDT2DT(unsigned char cdt) 4051da177e4SLinus Torvalds { 4061da177e4SLinus Torvalds unsigned int dt; 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds switch(cdt) { 4091da177e4SLinus Torvalds case CDT_UNKNOWN: dt = DT_UNKNOWN; break; 4101da177e4SLinus Torvalds case CDT_FIFO: dt = DT_FIFO; break; 4111da177e4SLinus Torvalds case CDT_CHR: dt = DT_CHR; break; 4121da177e4SLinus Torvalds case CDT_DIR: dt = DT_DIR; break; 4131da177e4SLinus Torvalds case CDT_BLK: dt = DT_BLK; break; 4141da177e4SLinus Torvalds case CDT_REG: dt = DT_REG; break; 4151da177e4SLinus Torvalds case CDT_LNK: dt = DT_LNK; break; 4161da177e4SLinus Torvalds case CDT_SOCK: dt = DT_SOCK; break; 4171da177e4SLinus Torvalds case CDT_WHT: dt = DT_WHT; break; 4181da177e4SLinus Torvalds default: dt = DT_UNKNOWN; break; 4191da177e4SLinus Torvalds } 4201da177e4SLinus Torvalds return dt; 4211da177e4SLinus Torvalds } 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds /* support routines */ 424e924f251SAl Viro static int coda_venus_readdir(struct file *coda_file, struct dir_context *ctx) 4251da177e4SLinus Torvalds { 42697875253SJan Harkes struct coda_file_info *cfi; 42797875253SJan Harkes struct coda_inode_info *cii; 42897875253SJan Harkes struct file *host_file; 4291da177e4SLinus Torvalds struct venus_dirent *vdir; 430ee60498fSAl Viro unsigned long vdir_size = offsetof(struct venus_dirent, d_name); 4311da177e4SLinus Torvalds unsigned int type; 4321da177e4SLinus Torvalds struct qstr name; 4331da177e4SLinus Torvalds ino_t ino; 43497875253SJan Harkes int ret; 43597875253SJan Harkes 43697875253SJan Harkes cfi = CODA_FTOC(coda_file); 43797875253SJan Harkes BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); 43897875253SJan Harkes host_file = cfi->cfi_container; 43997875253SJan Harkes 44093fe74b2SAl Viro cii = ITOC(file_inode(coda_file)); 4411da177e4SLinus Torvalds 442f52720caSPanagiotis Issaris vdir = kmalloc(sizeof(*vdir), GFP_KERNEL); 4431da177e4SLinus Torvalds if (!vdir) return -ENOMEM; 4441da177e4SLinus Torvalds 445e924f251SAl Viro if (!dir_emit_dots(coda_file, ctx)) 4465f47c7eaSAl Viro goto out; 447e924f251SAl Viro 4481da177e4SLinus Torvalds while (1) { 4491da177e4SLinus Torvalds /* read entries from the directory file */ 450e924f251SAl Viro ret = kernel_read(host_file, ctx->pos - 2, (char *)vdir, 4511da177e4SLinus Torvalds sizeof(*vdir)); 4521da177e4SLinus Torvalds if (ret < 0) { 4536d6bd94fSFabian Frederick pr_err("%s: read dir %s failed %d\n", 4546d6bd94fSFabian Frederick __func__, coda_f2s(&cii->c_fid), ret); 4551da177e4SLinus Torvalds break; 4561da177e4SLinus Torvalds } 4571da177e4SLinus Torvalds if (ret == 0) break; /* end of directory file reached */ 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds /* catch truncated reads */ 4601da177e4SLinus Torvalds if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) { 4616d6bd94fSFabian Frederick pr_err("%s: short read on %s\n", 4626d6bd94fSFabian Frederick __func__, coda_f2s(&cii->c_fid)); 4631da177e4SLinus Torvalds ret = -EBADF; 4641da177e4SLinus Torvalds break; 4651da177e4SLinus Torvalds } 4661da177e4SLinus Torvalds /* validate whether the directory file actually makes sense */ 4671da177e4SLinus Torvalds if (vdir->d_reclen < vdir_size + vdir->d_namlen) { 4686d6bd94fSFabian Frederick pr_err("%s: invalid dir %s\n", 4696d6bd94fSFabian Frederick __func__, coda_f2s(&cii->c_fid)); 4701da177e4SLinus Torvalds ret = -EBADF; 4711da177e4SLinus Torvalds break; 4721da177e4SLinus Torvalds } 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds name.len = vdir->d_namlen; 4751da177e4SLinus Torvalds name.name = vdir->d_name; 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds /* Make sure we skip '.' and '..', we already got those */ 4781da177e4SLinus Torvalds if (name.name[0] == '.' && (name.len == 1 || 479e924f251SAl Viro (name.name[1] == '.' && name.len == 2))) 4801da177e4SLinus Torvalds vdir->d_fileno = name.len = 0; 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds /* skip null entries */ 4831da177e4SLinus Torvalds if (vdir->d_fileno && name.len) { 4846b5e1223SAl Viro ino = vdir->d_fileno; 4851da177e4SLinus Torvalds type = CDT2DT(vdir->d_type); 486e924f251SAl Viro if (!dir_emit(ctx, name.name, name.len, ino, type)) 487e924f251SAl Viro break; 4881da177e4SLinus Torvalds } 4891da177e4SLinus Torvalds /* we'll always have progress because d_reclen is unsigned and 4901da177e4SLinus Torvalds * we've already established it is non-zero. */ 491e924f251SAl Viro ctx->pos += vdir->d_reclen; 4921da177e4SLinus Torvalds } 4935f47c7eaSAl Viro out: 4941da177e4SLinus Torvalds kfree(vdir); 495e924f251SAl Viro return 0; 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds 4981da177e4SLinus Torvalds /* called when a cache lookup succeeds */ 4990b728e19SAl Viro static int coda_dentry_revalidate(struct dentry *de, unsigned int flags) 5001da177e4SLinus Torvalds { 50134286d66SNick Piggin struct inode *inode; 5021da177e4SLinus Torvalds struct coda_inode_info *cii; 5031da177e4SLinus Torvalds 5040b728e19SAl Viro if (flags & LOOKUP_RCU) 50534286d66SNick Piggin return -ECHILD; 50634286d66SNick Piggin 50734286d66SNick Piggin inode = de->d_inode; 508a7400222SAl Viro if (!inode || is_root_inode(inode)) 5091da177e4SLinus Torvalds goto out; 5101da177e4SLinus Torvalds if (is_bad_inode(inode)) 5111da177e4SLinus Torvalds goto bad; 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds cii = ITOC(de->d_inode); 5141da177e4SLinus Torvalds if (!(cii->c_flags & (C_PURGE | C_FLUSH))) 5151da177e4SLinus Torvalds goto out; 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds shrink_dcache_parent(de); 5181da177e4SLinus Torvalds 5191da177e4SLinus Torvalds /* propagate for a flush */ 5201da177e4SLinus Torvalds if (cii->c_flags & C_FLUSH) 5211da177e4SLinus Torvalds coda_flag_inode_children(inode, C_FLUSH); 5221da177e4SLinus Torvalds 52384d08fa8SAl Viro if (d_count(de) > 1) 5241da177e4SLinus Torvalds /* pretend it's valid, but don't change the flags */ 5251da177e4SLinus Torvalds goto out; 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds /* clear the flags. */ 528b5ce1d83SYoshihisa Abe spin_lock(&cii->c_lock); 5291da177e4SLinus Torvalds cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); 530b5ce1d83SYoshihisa Abe spin_unlock(&cii->c_lock); 5311da177e4SLinus Torvalds bad: 5321da177e4SLinus Torvalds return 0; 5331da177e4SLinus Torvalds out: 5341da177e4SLinus Torvalds return 1; 5351da177e4SLinus Torvalds } 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds /* 5381da177e4SLinus Torvalds * This is the callback from dput() when d_count is going to 0. 5391da177e4SLinus Torvalds * We use this to unhash dentries with bad inodes. 5401da177e4SLinus Torvalds */ 541fe15ce44SNick Piggin static int coda_dentry_delete(const struct dentry * dentry) 5421da177e4SLinus Torvalds { 5431da177e4SLinus Torvalds int flags; 5441da177e4SLinus Torvalds 5451da177e4SLinus Torvalds if (!dentry->d_inode) 5461da177e4SLinus Torvalds return 0; 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds flags = (ITOC(dentry->d_inode)->c_flags) & C_PURGE; 5491da177e4SLinus Torvalds if (is_bad_inode(dentry->d_inode) || flags) { 5501da177e4SLinus Torvalds return 1; 5511da177e4SLinus Torvalds } 5521da177e4SLinus Torvalds return 0; 5531da177e4SLinus Torvalds } 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds /* 5581da177e4SLinus Torvalds * This is called when we want to check if the inode has 5591da177e4SLinus Torvalds * changed on the server. Coda makes this easy since the 5601da177e4SLinus Torvalds * cache manager Venus issues a downcall to the kernel when this 5611da177e4SLinus Torvalds * happens 5621da177e4SLinus Torvalds */ 56311d100d9SAl Viro int coda_revalidate_inode(struct inode *inode) 5641da177e4SLinus Torvalds { 5651da177e4SLinus Torvalds struct coda_vattr attr; 566f7cc02b8SYoshihisa Abe int error; 5671da177e4SLinus Torvalds int old_mode; 5681da177e4SLinus Torvalds ino_t old_ino; 5691da177e4SLinus Torvalds struct coda_inode_info *cii = ITOC(inode); 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds if (!cii->c_flags) 572f7cc02b8SYoshihisa Abe return 0; 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) { 5751da177e4SLinus Torvalds error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr); 5761da177e4SLinus Torvalds if (error) 577f7cc02b8SYoshihisa Abe return -EIO; 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds /* this inode may be lost if: 5801da177e4SLinus Torvalds - it's ino changed 5811da177e4SLinus Torvalds - type changes must be permitted for repair and 5821da177e4SLinus Torvalds missing mount points. 5831da177e4SLinus Torvalds */ 5841da177e4SLinus Torvalds old_mode = inode->i_mode; 5851da177e4SLinus Torvalds old_ino = inode->i_ino; 5861da177e4SLinus Torvalds coda_vattr_to_iattr(inode, &attr); 5871da177e4SLinus Torvalds 5881da177e4SLinus Torvalds if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) { 589f38cfb25SFabian Frederick pr_warn("inode %ld, fid %s changed type!\n", 5901da177e4SLinus Torvalds inode->i_ino, coda_f2s(&(cii->c_fid))); 5911da177e4SLinus Torvalds } 5921da177e4SLinus Torvalds 5931da177e4SLinus Torvalds /* the following can happen when a local fid is replaced 5941da177e4SLinus Torvalds with a global one, here we lose and declare the inode bad */ 5951da177e4SLinus Torvalds if (inode->i_ino != old_ino) 596f7cc02b8SYoshihisa Abe return -EIO; 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds coda_flag_inode_children(inode, C_FLUSH); 599b5ce1d83SYoshihisa Abe 600b5ce1d83SYoshihisa Abe spin_lock(&cii->c_lock); 6011da177e4SLinus Torvalds cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); 602b5ce1d83SYoshihisa Abe spin_unlock(&cii->c_lock); 6031da177e4SLinus Torvalds } 6041da177e4SLinus Torvalds return 0; 6051da177e4SLinus Torvalds } 606