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> 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds #include <asm/uaccess.h> 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds #include <linux/coda.h> 251da177e4SLinus Torvalds #include <linux/coda_linux.h> 261da177e4SLinus Torvalds #include <linux/coda_psdev.h> 271da177e4SLinus Torvalds #include <linux/coda_fs_i.h> 281da177e4SLinus Torvalds #include <linux/coda_cache.h> 291da177e4SLinus Torvalds 30c98d8cfbSAdrian Bunk #include "coda_int.h" 31c98d8cfbSAdrian Bunk 321da177e4SLinus Torvalds /* dir inode-ops */ 331da177e4SLinus Torvalds static int coda_create(struct inode *dir, struct dentry *new, int mode, struct nameidata *nd); 341da177e4SLinus Torvalds static struct dentry *coda_lookup(struct inode *dir, struct dentry *target, struct nameidata *nd); 351da177e4SLinus Torvalds static int coda_link(struct dentry *old_dentry, struct inode *dir_inode, 361da177e4SLinus Torvalds struct dentry *entry); 371da177e4SLinus Torvalds static int coda_unlink(struct inode *dir_inode, struct dentry *entry); 381da177e4SLinus Torvalds static int coda_symlink(struct inode *dir_inode, struct dentry *entry, 391da177e4SLinus Torvalds const char *symname); 401da177e4SLinus Torvalds static int coda_mkdir(struct inode *dir_inode, struct dentry *entry, int mode); 411da177e4SLinus Torvalds static int coda_rmdir(struct inode *dir_inode, struct dentry *entry); 421da177e4SLinus Torvalds static int coda_rename(struct inode *old_inode, struct dentry *old_dentry, 431da177e4SLinus Torvalds struct inode *new_inode, struct dentry *new_dentry); 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds /* dir file-ops */ 4697875253SJan Harkes static int coda_readdir(struct file *file, void *buf, filldir_t filldir); 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds /* dentry ops */ 491da177e4SLinus Torvalds static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd); 50fe15ce44SNick Piggin static int coda_dentry_delete(const struct dentry *); 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds /* support routines */ 5397875253SJan Harkes static int coda_venus_readdir(struct file *coda_file, void *buf, 5497875253SJan Harkes filldir_t filldir); 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds /* same as fs/bad_inode.c */ 571da177e4SLinus Torvalds static int coda_return_EIO(void) 581da177e4SLinus Torvalds { 591da177e4SLinus Torvalds return -EIO; 601da177e4SLinus Torvalds } 611da177e4SLinus Torvalds #define CODA_EIO_ERROR ((void *) (coda_return_EIO)) 621da177e4SLinus Torvalds 63e16404edSAl Viro static const struct dentry_operations coda_dentry_operations = 641da177e4SLinus Torvalds { 651da177e4SLinus Torvalds .d_revalidate = coda_dentry_revalidate, 661da177e4SLinus Torvalds .d_delete = coda_dentry_delete, 671da177e4SLinus Torvalds }; 681da177e4SLinus Torvalds 69754661f1SArjan van de Ven const struct inode_operations coda_dir_inode_operations = 701da177e4SLinus Torvalds { 711da177e4SLinus Torvalds .create = coda_create, 721da177e4SLinus Torvalds .lookup = coda_lookup, 731da177e4SLinus Torvalds .link = coda_link, 741da177e4SLinus Torvalds .unlink = coda_unlink, 751da177e4SLinus Torvalds .symlink = coda_symlink, 761da177e4SLinus Torvalds .mkdir = coda_mkdir, 771da177e4SLinus Torvalds .rmdir = coda_rmdir, 781da177e4SLinus Torvalds .mknod = CODA_EIO_ERROR, 791da177e4SLinus Torvalds .rename = coda_rename, 801da177e4SLinus Torvalds .permission = coda_permission, 811da177e4SLinus Torvalds .getattr = coda_getattr, 821da177e4SLinus Torvalds .setattr = coda_setattr, 831da177e4SLinus Torvalds }; 841da177e4SLinus Torvalds 854b6f5d20SArjan van de Ven const struct file_operations coda_dir_operations = { 861da177e4SLinus Torvalds .llseek = generic_file_llseek, 871da177e4SLinus Torvalds .read = generic_read_dir, 881da177e4SLinus Torvalds .readdir = coda_readdir, 891da177e4SLinus Torvalds .open = coda_open, 901da177e4SLinus Torvalds .release = coda_release, 911da177e4SLinus Torvalds .fsync = coda_fsync, 921da177e4SLinus Torvalds }; 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds /* inode operations for directories */ 961da177e4SLinus Torvalds /* access routines: lookup, readlink, permission */ 971da177e4SLinus Torvalds static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, struct nameidata *nd) 981da177e4SLinus Torvalds { 99ed36f723SJan Harkes struct inode *inode = NULL; 1001da177e4SLinus Torvalds struct CodaFid resfid = { { 0, } }; 1011da177e4SLinus Torvalds int type = 0; 1021da177e4SLinus Torvalds int error = 0; 1031da177e4SLinus Torvalds const char *name = entry->d_name.name; 1041da177e4SLinus Torvalds size_t length = entry->d_name.len; 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds if (length > CODA_MAXNAMLEN) { 107ed36f723SJan Harkes printk(KERN_ERR "name too long: lookup, %s (%*s)\n", 1081da177e4SLinus Torvalds coda_i2s(dir), (int)length, name); 1091da177e4SLinus Torvalds return ERR_PTR(-ENAMETOOLONG); 1101da177e4SLinus Torvalds } 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds /* control object, create inode on the fly */ 1131da177e4SLinus Torvalds if (coda_isroot(dir) && coda_iscontrol(name, length)) { 114ed36f723SJan Harkes error = coda_cnode_makectl(&inode, dir->i_sb); 115ed36f723SJan Harkes type = CODA_NOCACHE; 1161da177e4SLinus Torvalds goto exit; 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds 119ed36f723SJan Harkes error = venus_lookup(dir->i_sb, coda_i2f(dir), name, length, 120ed36f723SJan Harkes &type, &resfid); 121ed36f723SJan Harkes if (!error) 122ed36f723SJan Harkes error = coda_cnode_make(&inode, &resfid, dir->i_sb); 1231da177e4SLinus Torvalds 124ed36f723SJan Harkes if (error && error != -ENOENT) 1251da177e4SLinus Torvalds return ERR_PTR(error); 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds exit: 1281da177e4SLinus Torvalds entry->d_op = &coda_dentry_operations; 129ed36f723SJan Harkes 130ed36f723SJan Harkes if (inode && (type & CODA_NOCACHE)) 131ed36f723SJan Harkes coda_flag_inode(inode, C_VATTR | C_PURGE); 132ed36f723SJan Harkes 133ed36f723SJan Harkes return d_splice_alias(inode, entry); 1341da177e4SLinus Torvalds } 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds 137e6305c43SAl Viro int coda_permission(struct inode *inode, int mask) 1381da177e4SLinus Torvalds { 139f7cc02b8SYoshihisa Abe int error; 1401da177e4SLinus Torvalds 141e6305c43SAl Viro mask &= MAY_READ | MAY_WRITE | MAY_EXEC; 142e6305c43SAl Viro 1431da177e4SLinus Torvalds if (!mask) 1441da177e4SLinus Torvalds return 0; 1451da177e4SLinus Torvalds 146f696a365SMiklos Szeredi if ((mask & MAY_EXEC) && !execute_ok(inode)) 147f696a365SMiklos Szeredi return -EACCES; 148f696a365SMiklos Szeredi 1491da177e4SLinus Torvalds if (coda_cache_check(inode, mask)) 150f7cc02b8SYoshihisa Abe return 0; 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds error = venus_access(inode->i_sb, coda_i2f(inode), mask); 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds if (!error) 1551da177e4SLinus Torvalds coda_cache_enter(inode, mask); 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds return error; 1581da177e4SLinus Torvalds } 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds 161d728900cSJan Harkes static inline void coda_dir_update_mtime(struct inode *dir) 1621da177e4SLinus Torvalds { 1631da177e4SLinus Torvalds #ifdef REQUERY_VENUS_FOR_MTIME 1641da177e4SLinus Torvalds /* invalidate the directory cnode's attributes so we refetch the 1651da177e4SLinus Torvalds * attributes from venus next time the inode is referenced */ 1661da177e4SLinus Torvalds coda_flag_inode(dir, C_VATTR); 1671da177e4SLinus Torvalds #else 1681da177e4SLinus Torvalds /* optimistically we can also act as if our nose bleeds. The 1691da177e4SLinus Torvalds * granularity of the mtime is coarse anyways so we might actually be 1701da177e4SLinus Torvalds * right most of the time. Note: we only do this for directories. */ 1711da177e4SLinus Torvalds dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC; 1721da177e4SLinus Torvalds #endif 173d728900cSJan Harkes } 174d728900cSJan Harkes 175d728900cSJan Harkes /* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a 176d728900cSJan Harkes * trick to fool GNU find's optimizations. If we can't be sure of the link 177d728900cSJan Harkes * (because of volume mount points) we set i_nlink to 1 which forces find 178d728900cSJan Harkes * to consider every child as a possible directory. We should also never 179d728900cSJan Harkes * see an increment or decrement for deleted directories where i_nlink == 0 */ 180d728900cSJan Harkes static inline void coda_dir_inc_nlink(struct inode *dir) 181d728900cSJan Harkes { 182d728900cSJan Harkes if (dir->i_nlink >= 2) 183d728900cSJan Harkes inc_nlink(dir); 184d728900cSJan Harkes } 185d728900cSJan Harkes 186d728900cSJan Harkes static inline void coda_dir_drop_nlink(struct inode *dir) 187d728900cSJan Harkes { 188d728900cSJan Harkes if (dir->i_nlink > 2) 189d728900cSJan Harkes drop_nlink(dir); 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds /* creation routines: create, mknod, mkdir, link, symlink */ 1931da177e4SLinus Torvalds static int coda_create(struct inode *dir, struct dentry *de, int mode, struct nameidata *nd) 1941da177e4SLinus Torvalds { 195f7cc02b8SYoshihisa Abe int error; 1961da177e4SLinus Torvalds const char *name=de->d_name.name; 1971da177e4SLinus Torvalds int length=de->d_name.len; 1981da177e4SLinus Torvalds struct inode *inode; 1991da177e4SLinus Torvalds struct CodaFid newfid; 2001da177e4SLinus Torvalds struct coda_vattr attrs; 2011da177e4SLinus Torvalds 202f7cc02b8SYoshihisa Abe if (coda_isroot(dir) && coda_iscontrol(name, length)) 2031da177e4SLinus Torvalds return -EPERM; 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds error = venus_create(dir->i_sb, coda_i2f(dir), name, length, 2061da177e4SLinus Torvalds 0, mode, &newfid, &attrs); 207f7cc02b8SYoshihisa Abe if (error) 208f7cc02b8SYoshihisa Abe goto err_out; 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds inode = coda_iget(dir->i_sb, &newfid, &attrs); 2111da177e4SLinus Torvalds if (IS_ERR(inode)) { 212f7cc02b8SYoshihisa Abe error = PTR_ERR(inode); 213f7cc02b8SYoshihisa Abe goto err_out; 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds /* invalidate the directory cnode's attributes */ 217d728900cSJan Harkes coda_dir_update_mtime(dir); 2181da177e4SLinus Torvalds d_instantiate(de, inode); 2191da177e4SLinus Torvalds return 0; 220f7cc02b8SYoshihisa Abe err_out: 221f7cc02b8SYoshihisa Abe d_drop(de); 222f7cc02b8SYoshihisa Abe return error; 2231da177e4SLinus Torvalds } 2241da177e4SLinus Torvalds 2251da177e4SLinus Torvalds static int coda_mkdir(struct inode *dir, struct dentry *de, int mode) 2261da177e4SLinus Torvalds { 2271da177e4SLinus Torvalds struct inode *inode; 2281da177e4SLinus Torvalds struct coda_vattr attrs; 2291da177e4SLinus Torvalds const char *name = de->d_name.name; 2301da177e4SLinus Torvalds int len = de->d_name.len; 2311da177e4SLinus Torvalds int error; 2321da177e4SLinus Torvalds struct CodaFid newfid; 2331da177e4SLinus Torvalds 234f7cc02b8SYoshihisa Abe if (coda_isroot(dir) && coda_iscontrol(name, len)) 2351da177e4SLinus Torvalds return -EPERM; 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds attrs.va_mode = mode; 2381da177e4SLinus Torvalds error = venus_mkdir(dir->i_sb, coda_i2f(dir), 2391da177e4SLinus Torvalds name, len, &newfid, &attrs); 240f7cc02b8SYoshihisa Abe if (error) 241f7cc02b8SYoshihisa Abe goto err_out; 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds inode = coda_iget(dir->i_sb, &newfid, &attrs); 2441da177e4SLinus Torvalds if (IS_ERR(inode)) { 245f7cc02b8SYoshihisa Abe error = PTR_ERR(inode); 246f7cc02b8SYoshihisa Abe goto err_out; 2471da177e4SLinus Torvalds } 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds /* invalidate the directory cnode's attributes */ 250d728900cSJan Harkes coda_dir_inc_nlink(dir); 251d728900cSJan Harkes coda_dir_update_mtime(dir); 2521da177e4SLinus Torvalds d_instantiate(de, inode); 2531da177e4SLinus Torvalds return 0; 254f7cc02b8SYoshihisa Abe err_out: 255f7cc02b8SYoshihisa Abe d_drop(de); 256f7cc02b8SYoshihisa Abe return error; 2571da177e4SLinus Torvalds } 2581da177e4SLinus Torvalds 2591da177e4SLinus Torvalds /* try to make de an entry in dir_inodde linked to source_de */ 2601da177e4SLinus Torvalds static int coda_link(struct dentry *source_de, struct inode *dir_inode, 2611da177e4SLinus Torvalds struct dentry *de) 2621da177e4SLinus Torvalds { 2631da177e4SLinus Torvalds struct inode *inode = source_de->d_inode; 2641da177e4SLinus Torvalds const char * name = de->d_name.name; 2651da177e4SLinus Torvalds int len = de->d_name.len; 2661da177e4SLinus Torvalds int error; 2671da177e4SLinus Torvalds 268f7cc02b8SYoshihisa Abe if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) 2691da177e4SLinus Torvalds return -EPERM; 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds error = venus_link(dir_inode->i_sb, coda_i2f(inode), 2721da177e4SLinus Torvalds coda_i2f(dir_inode), (const char *)name, len); 2731da177e4SLinus Torvalds if (error) { 2741da177e4SLinus Torvalds d_drop(de); 275f7cc02b8SYoshihisa Abe return error; 2761da177e4SLinus Torvalds } 2771da177e4SLinus Torvalds 278d728900cSJan Harkes coda_dir_update_mtime(dir_inode); 2797de9c6eeSAl Viro ihold(inode); 2801da177e4SLinus Torvalds d_instantiate(de, inode); 281d8c76e6fSDave Hansen inc_nlink(inode); 282f7cc02b8SYoshihisa Abe return 0; 2831da177e4SLinus Torvalds } 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds static int coda_symlink(struct inode *dir_inode, struct dentry *de, 2871da177e4SLinus Torvalds const char *symname) 2881da177e4SLinus Torvalds { 2891da177e4SLinus Torvalds const char *name = de->d_name.name; 2901da177e4SLinus Torvalds int len = de->d_name.len; 2911da177e4SLinus Torvalds int symlen; 292f7cc02b8SYoshihisa Abe int error; 2931da177e4SLinus Torvalds 294f7cc02b8SYoshihisa Abe if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) 2951da177e4SLinus Torvalds return -EPERM; 2961da177e4SLinus Torvalds 2971da177e4SLinus Torvalds symlen = strlen(symname); 298f7cc02b8SYoshihisa Abe if (symlen > CODA_MAXPATHLEN) 2991da177e4SLinus Torvalds return -ENAMETOOLONG; 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds /* 3021da177e4SLinus Torvalds * This entry is now negative. Since we do not create 3031da177e4SLinus Torvalds * an inode for the entry we have to drop it. 3041da177e4SLinus Torvalds */ 3051da177e4SLinus Torvalds d_drop(de); 3061da177e4SLinus Torvalds error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len, 3071da177e4SLinus Torvalds symname, symlen); 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds /* mtime is no good anymore */ 3101da177e4SLinus Torvalds if (!error) 311d728900cSJan Harkes coda_dir_update_mtime(dir_inode); 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds return error; 3141da177e4SLinus Torvalds } 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds /* destruction routines: unlink, rmdir */ 3179fe76c76SHarvey Harrison static int coda_unlink(struct inode *dir, struct dentry *de) 3181da177e4SLinus Torvalds { 3191da177e4SLinus Torvalds int error; 3201da177e4SLinus Torvalds const char *name = de->d_name.name; 3211da177e4SLinus Torvalds int len = de->d_name.len; 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds error = venus_remove(dir->i_sb, coda_i2f(dir), name, len); 324f7cc02b8SYoshihisa Abe if (error) 3251da177e4SLinus Torvalds return error; 3261da177e4SLinus Torvalds 327d728900cSJan Harkes coda_dir_update_mtime(dir); 3289a53c3a7SDave Hansen drop_nlink(de->d_inode); 3291da177e4SLinus Torvalds return 0; 3301da177e4SLinus Torvalds } 3311da177e4SLinus Torvalds 3329fe76c76SHarvey Harrison static int coda_rmdir(struct inode *dir, struct dentry *de) 3331da177e4SLinus Torvalds { 3341da177e4SLinus Torvalds const char *name = de->d_name.name; 3351da177e4SLinus Torvalds int len = de->d_name.len; 3361da177e4SLinus Torvalds int error; 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len); 3398c6d2152SJan Harkes if (!error) { 3408c6d2152SJan Harkes /* VFS may delete the child */ 3418c6d2152SJan Harkes if (de->d_inode) 3428c6d2152SJan Harkes de->d_inode->i_nlink = 0; 3431da177e4SLinus Torvalds 3448c6d2152SJan Harkes /* fix the link count of the parent */ 345d728900cSJan Harkes coda_dir_drop_nlink(dir); 346d728900cSJan Harkes coda_dir_update_mtime(dir); 3478c6d2152SJan Harkes } 3488c6d2152SJan Harkes return error; 3491da177e4SLinus Torvalds } 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds /* rename */ 3521da177e4SLinus Torvalds static int coda_rename(struct inode *old_dir, struct dentry *old_dentry, 3531da177e4SLinus Torvalds struct inode *new_dir, struct dentry *new_dentry) 3541da177e4SLinus Torvalds { 3551da177e4SLinus Torvalds const char *old_name = old_dentry->d_name.name; 3561da177e4SLinus Torvalds const char *new_name = new_dentry->d_name.name; 3571da177e4SLinus Torvalds int old_length = old_dentry->d_name.len; 3581da177e4SLinus Torvalds int new_length = new_dentry->d_name.len; 3591da177e4SLinus Torvalds int error; 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds error = venus_rename(old_dir->i_sb, coda_i2f(old_dir), 3621da177e4SLinus Torvalds coda_i2f(new_dir), old_length, new_length, 3631da177e4SLinus Torvalds (const char *) old_name, (const char *)new_name); 3641da177e4SLinus Torvalds if (!error) { 3651da177e4SLinus Torvalds if (new_dentry->d_inode) { 366d728900cSJan Harkes if (S_ISDIR(new_dentry->d_inode->i_mode)) { 367d728900cSJan Harkes coda_dir_drop_nlink(old_dir); 368d728900cSJan Harkes coda_dir_inc_nlink(new_dir); 369d728900cSJan Harkes } 370d728900cSJan Harkes coda_dir_update_mtime(old_dir); 371d728900cSJan Harkes coda_dir_update_mtime(new_dir); 3721da177e4SLinus Torvalds coda_flag_inode(new_dentry->d_inode, C_VATTR); 3731da177e4SLinus Torvalds } else { 3741da177e4SLinus Torvalds coda_flag_inode(old_dir, C_VATTR); 3751da177e4SLinus Torvalds coda_flag_inode(new_dir, C_VATTR); 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds } 3781da177e4SLinus Torvalds return error; 3791da177e4SLinus Torvalds } 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds /* file operations for directories */ 3839fe76c76SHarvey Harrison static int coda_readdir(struct file *coda_file, void *buf, filldir_t filldir) 3841da177e4SLinus Torvalds { 3851da177e4SLinus Torvalds struct coda_file_info *cfi; 3861da177e4SLinus Torvalds struct file *host_file; 3871da177e4SLinus Torvalds int ret; 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds cfi = CODA_FTOC(coda_file); 3901da177e4SLinus Torvalds BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); 3911da177e4SLinus Torvalds host_file = cfi->cfi_container; 3921da177e4SLinus Torvalds 39397875253SJan Harkes if (!host_file->f_op) 39497875253SJan Harkes return -ENOTDIR; 39597875253SJan Harkes 39697875253SJan Harkes if (host_file->f_op->readdir) 39797875253SJan Harkes { 39897875253SJan Harkes /* potemkin case: we were handed a directory inode. 39997875253SJan Harkes * We can't use vfs_readdir because we have to keep the file 40097875253SJan Harkes * position in sync between the coda_file and the host_file. 40197875253SJan Harkes * and as such we need grab the inode mutex. */ 40297875253SJan Harkes struct inode *host_inode = host_file->f_path.dentry->d_inode; 40397875253SJan Harkes 4041b1dcc1bSJes Sorensen mutex_lock(&host_inode->i_mutex); 4051da177e4SLinus Torvalds host_file->f_pos = coda_file->f_pos; 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds ret = -ENOENT; 4081da177e4SLinus Torvalds if (!IS_DEADDIR(host_inode)) { 40997875253SJan Harkes ret = host_file->f_op->readdir(host_file, buf, filldir); 4101da177e4SLinus Torvalds file_accessed(host_file); 4111da177e4SLinus Torvalds } 41297875253SJan Harkes 4131da177e4SLinus Torvalds coda_file->f_pos = host_file->f_pos; 4141b1dcc1bSJes Sorensen mutex_unlock(&host_inode->i_mutex); 41597875253SJan Harkes } 41697875253SJan Harkes else /* Venus: we must read Venus dirents from a file */ 41797875253SJan Harkes ret = coda_venus_readdir(coda_file, buf, filldir); 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds return ret; 4201da177e4SLinus Torvalds } 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds static inline unsigned int CDT2DT(unsigned char cdt) 4231da177e4SLinus Torvalds { 4241da177e4SLinus Torvalds unsigned int dt; 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds switch(cdt) { 4271da177e4SLinus Torvalds case CDT_UNKNOWN: dt = DT_UNKNOWN; break; 4281da177e4SLinus Torvalds case CDT_FIFO: dt = DT_FIFO; break; 4291da177e4SLinus Torvalds case CDT_CHR: dt = DT_CHR; break; 4301da177e4SLinus Torvalds case CDT_DIR: dt = DT_DIR; break; 4311da177e4SLinus Torvalds case CDT_BLK: dt = DT_BLK; break; 4321da177e4SLinus Torvalds case CDT_REG: dt = DT_REG; break; 4331da177e4SLinus Torvalds case CDT_LNK: dt = DT_LNK; break; 4341da177e4SLinus Torvalds case CDT_SOCK: dt = DT_SOCK; break; 4351da177e4SLinus Torvalds case CDT_WHT: dt = DT_WHT; break; 4361da177e4SLinus Torvalds default: dt = DT_UNKNOWN; break; 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds return dt; 4391da177e4SLinus Torvalds } 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds /* support routines */ 44297875253SJan Harkes static int coda_venus_readdir(struct file *coda_file, void *buf, 44397875253SJan Harkes filldir_t filldir) 4441da177e4SLinus Torvalds { 4451da177e4SLinus Torvalds int result = 0; /* # of entries returned */ 44697875253SJan Harkes struct coda_file_info *cfi; 44797875253SJan Harkes struct coda_inode_info *cii; 44897875253SJan Harkes struct file *host_file; 44997875253SJan Harkes struct dentry *de; 4501da177e4SLinus Torvalds struct venus_dirent *vdir; 4511da177e4SLinus Torvalds unsigned long vdir_size = 4521da177e4SLinus Torvalds (unsigned long)(&((struct venus_dirent *)0)->d_name); 4531da177e4SLinus Torvalds unsigned int type; 4541da177e4SLinus Torvalds struct qstr name; 4551da177e4SLinus Torvalds ino_t ino; 45697875253SJan Harkes int ret; 45797875253SJan Harkes 45897875253SJan Harkes cfi = CODA_FTOC(coda_file); 45997875253SJan Harkes BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); 46097875253SJan Harkes host_file = cfi->cfi_container; 46197875253SJan Harkes 46297875253SJan Harkes de = coda_file->f_path.dentry; 46397875253SJan Harkes cii = ITOC(de->d_inode); 4641da177e4SLinus Torvalds 465f52720caSPanagiotis Issaris vdir = kmalloc(sizeof(*vdir), GFP_KERNEL); 4661da177e4SLinus Torvalds if (!vdir) return -ENOMEM; 4671da177e4SLinus Torvalds 4685f47c7eaSAl Viro if (coda_file->f_pos == 0) { 46997875253SJan Harkes ret = filldir(buf, ".", 1, 0, de->d_inode->i_ino, DT_DIR); 4705f47c7eaSAl Viro if (ret < 0) 4715f47c7eaSAl Viro goto out; 4721da177e4SLinus Torvalds result++; 47397875253SJan Harkes coda_file->f_pos++; 4745f47c7eaSAl Viro } 4755f47c7eaSAl Viro if (coda_file->f_pos == 1) { 47697875253SJan Harkes ret = filldir(buf, "..", 2, 1, de->d_parent->d_inode->i_ino, DT_DIR); 4775f47c7eaSAl Viro if (ret < 0) 4785f47c7eaSAl Viro goto out; 4791da177e4SLinus Torvalds result++; 48097875253SJan Harkes coda_file->f_pos++; 4815f47c7eaSAl Viro } 4821da177e4SLinus Torvalds while (1) { 4831da177e4SLinus Torvalds /* read entries from the directory file */ 48497875253SJan Harkes ret = kernel_read(host_file, coda_file->f_pos - 2, (char *)vdir, 4851da177e4SLinus Torvalds sizeof(*vdir)); 4861da177e4SLinus Torvalds if (ret < 0) { 48797875253SJan Harkes printk(KERN_ERR "coda readdir: read dir %s failed %d\n", 48897875253SJan Harkes coda_f2s(&cii->c_fid), ret); 4891da177e4SLinus Torvalds break; 4901da177e4SLinus Torvalds } 4911da177e4SLinus Torvalds if (ret == 0) break; /* end of directory file reached */ 4921da177e4SLinus Torvalds 4931da177e4SLinus Torvalds /* catch truncated reads */ 4941da177e4SLinus Torvalds if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) { 49597875253SJan Harkes printk(KERN_ERR "coda readdir: short read on %s\n", 49697875253SJan Harkes coda_f2s(&cii->c_fid)); 4971da177e4SLinus Torvalds ret = -EBADF; 4981da177e4SLinus Torvalds break; 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds /* validate whether the directory file actually makes sense */ 5011da177e4SLinus Torvalds if (vdir->d_reclen < vdir_size + vdir->d_namlen) { 50297875253SJan Harkes printk(KERN_ERR "coda readdir: invalid dir %s\n", 50397875253SJan Harkes coda_f2s(&cii->c_fid)); 5041da177e4SLinus Torvalds ret = -EBADF; 5051da177e4SLinus Torvalds break; 5061da177e4SLinus Torvalds } 5071da177e4SLinus Torvalds 5081da177e4SLinus Torvalds name.len = vdir->d_namlen; 5091da177e4SLinus Torvalds name.name = vdir->d_name; 5101da177e4SLinus Torvalds 5111da177e4SLinus Torvalds /* Make sure we skip '.' and '..', we already got those */ 5121da177e4SLinus Torvalds if (name.name[0] == '.' && (name.len == 1 || 5131da177e4SLinus Torvalds (vdir->d_name[1] == '.' && name.len == 2))) 5141da177e4SLinus Torvalds vdir->d_fileno = name.len = 0; 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds /* skip null entries */ 5171da177e4SLinus Torvalds if (vdir->d_fileno && name.len) { 5181da177e4SLinus Torvalds /* try to look up this entry in the dcache, that way 5191da177e4SLinus Torvalds * userspace doesn't have to worry about breaking 5201da177e4SLinus Torvalds * getcwd by having mismatched inode numbers for 5211da177e4SLinus Torvalds * internal volume mountpoints. */ 52297875253SJan Harkes ino = find_inode_number(de, &name); 5231da177e4SLinus Torvalds if (!ino) ino = vdir->d_fileno; 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds type = CDT2DT(vdir->d_type); 52697875253SJan Harkes ret = filldir(buf, name.name, name.len, 52797875253SJan Harkes coda_file->f_pos, ino, type); 5281da177e4SLinus Torvalds /* failure means no space for filling in this round */ 5291da177e4SLinus Torvalds if (ret < 0) break; 5301da177e4SLinus Torvalds result++; 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds /* we'll always have progress because d_reclen is unsigned and 5331da177e4SLinus Torvalds * we've already established it is non-zero. */ 53497875253SJan Harkes coda_file->f_pos += vdir->d_reclen; 5351da177e4SLinus Torvalds } 5365f47c7eaSAl Viro out: 5371da177e4SLinus Torvalds kfree(vdir); 5381da177e4SLinus Torvalds return result ? result : ret; 5391da177e4SLinus Torvalds } 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds /* called when a cache lookup succeeds */ 5421da177e4SLinus Torvalds static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd) 5431da177e4SLinus Torvalds { 5441da177e4SLinus Torvalds struct inode *inode = de->d_inode; 5451da177e4SLinus Torvalds struct coda_inode_info *cii; 5461da177e4SLinus Torvalds 547f7cc02b8SYoshihisa Abe if (!inode || coda_isroot(inode)) 5481da177e4SLinus Torvalds goto out; 5491da177e4SLinus Torvalds if (is_bad_inode(inode)) 5501da177e4SLinus Torvalds goto bad; 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds cii = ITOC(de->d_inode); 5531da177e4SLinus Torvalds if (!(cii->c_flags & (C_PURGE | C_FLUSH))) 5541da177e4SLinus Torvalds goto out; 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds shrink_dcache_parent(de); 5571da177e4SLinus Torvalds 5581da177e4SLinus Torvalds /* propagate for a flush */ 5591da177e4SLinus Torvalds if (cii->c_flags & C_FLUSH) 5601da177e4SLinus Torvalds coda_flag_inode_children(inode, C_FLUSH); 5611da177e4SLinus Torvalds 562b7ab39f6SNick Piggin if (de->d_count > 1) 5631da177e4SLinus Torvalds /* pretend it's valid, but don't change the flags */ 5641da177e4SLinus Torvalds goto out; 5651da177e4SLinus Torvalds 5661da177e4SLinus Torvalds /* clear the flags. */ 567b5ce1d83SYoshihisa Abe spin_lock(&cii->c_lock); 5681da177e4SLinus Torvalds cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); 569b5ce1d83SYoshihisa Abe spin_unlock(&cii->c_lock); 5701da177e4SLinus Torvalds bad: 5711da177e4SLinus Torvalds return 0; 5721da177e4SLinus Torvalds out: 5731da177e4SLinus Torvalds return 1; 5741da177e4SLinus Torvalds } 5751da177e4SLinus Torvalds 5761da177e4SLinus Torvalds /* 5771da177e4SLinus Torvalds * This is the callback from dput() when d_count is going to 0. 5781da177e4SLinus Torvalds * We use this to unhash dentries with bad inodes. 5791da177e4SLinus Torvalds */ 580fe15ce44SNick Piggin static int coda_dentry_delete(const struct dentry * dentry) 5811da177e4SLinus Torvalds { 5821da177e4SLinus Torvalds int flags; 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds if (!dentry->d_inode) 5851da177e4SLinus Torvalds return 0; 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds flags = (ITOC(dentry->d_inode)->c_flags) & C_PURGE; 5881da177e4SLinus Torvalds if (is_bad_inode(dentry->d_inode) || flags) { 5891da177e4SLinus Torvalds return 1; 5901da177e4SLinus Torvalds } 5911da177e4SLinus Torvalds return 0; 5921da177e4SLinus Torvalds } 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds /* 5971da177e4SLinus Torvalds * This is called when we want to check if the inode has 5981da177e4SLinus Torvalds * changed on the server. Coda makes this easy since the 5991da177e4SLinus Torvalds * cache manager Venus issues a downcall to the kernel when this 6001da177e4SLinus Torvalds * happens 6011da177e4SLinus Torvalds */ 6021da177e4SLinus Torvalds int coda_revalidate_inode(struct dentry *dentry) 6031da177e4SLinus Torvalds { 6041da177e4SLinus Torvalds struct coda_vattr attr; 605f7cc02b8SYoshihisa Abe int error; 6061da177e4SLinus Torvalds int old_mode; 6071da177e4SLinus Torvalds ino_t old_ino; 6081da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 6091da177e4SLinus Torvalds struct coda_inode_info *cii = ITOC(inode); 6101da177e4SLinus Torvalds 6111da177e4SLinus Torvalds if (!cii->c_flags) 612f7cc02b8SYoshihisa Abe return 0; 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) { 6151da177e4SLinus Torvalds error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr); 6161da177e4SLinus Torvalds if (error) 617f7cc02b8SYoshihisa Abe return -EIO; 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds /* this inode may be lost if: 6201da177e4SLinus Torvalds - it's ino changed 6211da177e4SLinus Torvalds - type changes must be permitted for repair and 6221da177e4SLinus Torvalds missing mount points. 6231da177e4SLinus Torvalds */ 6241da177e4SLinus Torvalds old_mode = inode->i_mode; 6251da177e4SLinus Torvalds old_ino = inode->i_ino; 6261da177e4SLinus Torvalds coda_vattr_to_iattr(inode, &attr); 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) { 6291da177e4SLinus Torvalds printk("Coda: inode %ld, fid %s changed type!\n", 6301da177e4SLinus Torvalds inode->i_ino, coda_f2s(&(cii->c_fid))); 6311da177e4SLinus Torvalds } 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds /* the following can happen when a local fid is replaced 6341da177e4SLinus Torvalds with a global one, here we lose and declare the inode bad */ 6351da177e4SLinus Torvalds if (inode->i_ino != old_ino) 636f7cc02b8SYoshihisa Abe return -EIO; 6371da177e4SLinus Torvalds 6381da177e4SLinus Torvalds coda_flag_inode_children(inode, C_FLUSH); 639b5ce1d83SYoshihisa Abe 640b5ce1d83SYoshihisa Abe spin_lock(&cii->c_lock); 6411da177e4SLinus Torvalds cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); 642b5ce1d83SYoshihisa Abe spin_unlock(&cii->c_lock); 6431da177e4SLinus Torvalds } 6441da177e4SLinus Torvalds return 0; 6451da177e4SLinus Torvalds } 646