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> 151da177e4SLinus Torvalds #include <linux/file.h> 161da177e4SLinus Torvalds #include <linux/stat.h> 171da177e4SLinus Torvalds #include <linux/errno.h> 181da177e4SLinus Torvalds #include <linux/string.h> 191da177e4SLinus Torvalds #include <linux/smp_lock.h> 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds #include <asm/uaccess.h> 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds #include <linux/coda.h> 241da177e4SLinus Torvalds #include <linux/coda_linux.h> 251da177e4SLinus Torvalds #include <linux/coda_psdev.h> 261da177e4SLinus Torvalds #include <linux/coda_fs_i.h> 271da177e4SLinus Torvalds #include <linux/coda_cache.h> 281da177e4SLinus Torvalds #include <linux/coda_proc.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); 501da177e4SLinus Torvalds static int coda_dentry_delete(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 631da177e4SLinus Torvalds static 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 .flush = coda_flush, 911da177e4SLinus Torvalds .release = coda_release, 921da177e4SLinus Torvalds .fsync = coda_fsync, 931da177e4SLinus Torvalds }; 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds /* inode operations for directories */ 971da177e4SLinus Torvalds /* access routines: lookup, readlink, permission */ 981da177e4SLinus Torvalds static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, struct nameidata *nd) 991da177e4SLinus Torvalds { 100ed36f723SJan Harkes struct inode *inode = NULL; 1011da177e4SLinus Torvalds struct CodaFid resfid = { { 0, } }; 1021da177e4SLinus Torvalds int type = 0; 1031da177e4SLinus Torvalds int error = 0; 1041da177e4SLinus Torvalds const char *name = entry->d_name.name; 1051da177e4SLinus Torvalds size_t length = entry->d_name.len; 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds if (length > CODA_MAXNAMLEN) { 108ed36f723SJan Harkes printk(KERN_ERR "name too long: lookup, %s (%*s)\n", 1091da177e4SLinus Torvalds coda_i2s(dir), (int)length, name); 1101da177e4SLinus Torvalds return ERR_PTR(-ENAMETOOLONG); 1111da177e4SLinus Torvalds } 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds /* control object, create inode on the fly */ 1141da177e4SLinus Torvalds if (coda_isroot(dir) && coda_iscontrol(name, length)) { 115ed36f723SJan Harkes error = coda_cnode_makectl(&inode, dir->i_sb); 116ed36f723SJan Harkes type = CODA_NOCACHE; 1171da177e4SLinus Torvalds goto exit; 1181da177e4SLinus Torvalds } 1191da177e4SLinus Torvalds 120ed36f723SJan Harkes lock_kernel(); 1211da177e4SLinus Torvalds 122ed36f723SJan Harkes error = venus_lookup(dir->i_sb, coda_i2f(dir), name, length, 123ed36f723SJan Harkes &type, &resfid); 124ed36f723SJan Harkes if (!error) 125ed36f723SJan Harkes error = coda_cnode_make(&inode, &resfid, dir->i_sb); 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds unlock_kernel(); 128ed36f723SJan Harkes 129ed36f723SJan Harkes if (error && error != -ENOENT) 1301da177e4SLinus Torvalds return ERR_PTR(error); 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds exit: 1331da177e4SLinus Torvalds entry->d_op = &coda_dentry_operations; 134ed36f723SJan Harkes 135ed36f723SJan Harkes if (inode && (type & CODA_NOCACHE)) 136ed36f723SJan Harkes coda_flag_inode(inode, C_VATTR | C_PURGE); 137ed36f723SJan Harkes 138ed36f723SJan Harkes return d_splice_alias(inode, entry); 1391da177e4SLinus Torvalds } 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds int coda_permission(struct inode *inode, int mask, struct nameidata *nd) 1431da177e4SLinus Torvalds { 1441da177e4SLinus Torvalds int error = 0; 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds if (!mask) 1471da177e4SLinus Torvalds return 0; 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds lock_kernel(); 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds coda_vfs_stat.permission++; 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds if (coda_cache_check(inode, mask)) 1541da177e4SLinus Torvalds goto out; 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds error = venus_access(inode->i_sb, coda_i2f(inode), mask); 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds if (!error) 1591da177e4SLinus Torvalds coda_cache_enter(inode, mask); 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds out: 1621da177e4SLinus Torvalds unlock_kernel(); 1631da177e4SLinus Torvalds return error; 1641da177e4SLinus Torvalds } 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds 167d728900cSJan Harkes static inline void coda_dir_update_mtime(struct inode *dir) 1681da177e4SLinus Torvalds { 1691da177e4SLinus Torvalds #ifdef REQUERY_VENUS_FOR_MTIME 1701da177e4SLinus Torvalds /* invalidate the directory cnode's attributes so we refetch the 1711da177e4SLinus Torvalds * attributes from venus next time the inode is referenced */ 1721da177e4SLinus Torvalds coda_flag_inode(dir, C_VATTR); 1731da177e4SLinus Torvalds #else 1741da177e4SLinus Torvalds /* optimistically we can also act as if our nose bleeds. The 1751da177e4SLinus Torvalds * granularity of the mtime is coarse anyways so we might actually be 1761da177e4SLinus Torvalds * right most of the time. Note: we only do this for directories. */ 1771da177e4SLinus Torvalds dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC; 1781da177e4SLinus Torvalds #endif 179d728900cSJan Harkes } 180d728900cSJan Harkes 181d728900cSJan Harkes /* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a 182d728900cSJan Harkes * trick to fool GNU find's optimizations. If we can't be sure of the link 183d728900cSJan Harkes * (because of volume mount points) we set i_nlink to 1 which forces find 184d728900cSJan Harkes * to consider every child as a possible directory. We should also never 185d728900cSJan Harkes * see an increment or decrement for deleted directories where i_nlink == 0 */ 186d728900cSJan Harkes static inline void coda_dir_inc_nlink(struct inode *dir) 187d728900cSJan Harkes { 188d728900cSJan Harkes if (dir->i_nlink >= 2) 189d728900cSJan Harkes inc_nlink(dir); 190d728900cSJan Harkes } 191d728900cSJan Harkes 192d728900cSJan Harkes static inline void coda_dir_drop_nlink(struct inode *dir) 193d728900cSJan Harkes { 194d728900cSJan Harkes if (dir->i_nlink > 2) 195d728900cSJan Harkes drop_nlink(dir); 1961da177e4SLinus Torvalds } 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds /* creation routines: create, mknod, mkdir, link, symlink */ 1991da177e4SLinus Torvalds static int coda_create(struct inode *dir, struct dentry *de, int mode, struct nameidata *nd) 2001da177e4SLinus Torvalds { 2011da177e4SLinus Torvalds int error=0; 2021da177e4SLinus Torvalds const char *name=de->d_name.name; 2031da177e4SLinus Torvalds int length=de->d_name.len; 2041da177e4SLinus Torvalds struct inode *inode; 2051da177e4SLinus Torvalds struct CodaFid newfid; 2061da177e4SLinus Torvalds struct coda_vattr attrs; 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds lock_kernel(); 2091da177e4SLinus Torvalds coda_vfs_stat.create++; 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds if (coda_isroot(dir) && coda_iscontrol(name, length)) { 2121da177e4SLinus Torvalds unlock_kernel(); 2131da177e4SLinus Torvalds return -EPERM; 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds error = venus_create(dir->i_sb, coda_i2f(dir), name, length, 2171da177e4SLinus Torvalds 0, mode, &newfid, &attrs); 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds if ( error ) { 2201da177e4SLinus Torvalds unlock_kernel(); 2211da177e4SLinus Torvalds d_drop(de); 2221da177e4SLinus Torvalds return error; 2231da177e4SLinus Torvalds } 2241da177e4SLinus Torvalds 2251da177e4SLinus Torvalds inode = coda_iget(dir->i_sb, &newfid, &attrs); 2261da177e4SLinus Torvalds if ( IS_ERR(inode) ) { 2271da177e4SLinus Torvalds unlock_kernel(); 2281da177e4SLinus Torvalds d_drop(de); 2291da177e4SLinus Torvalds return PTR_ERR(inode); 2301da177e4SLinus Torvalds } 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds /* invalidate the directory cnode's attributes */ 233d728900cSJan Harkes coda_dir_update_mtime(dir); 2341da177e4SLinus Torvalds unlock_kernel(); 2351da177e4SLinus Torvalds d_instantiate(de, inode); 2361da177e4SLinus Torvalds return 0; 2371da177e4SLinus Torvalds } 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds static int coda_mkdir(struct inode *dir, struct dentry *de, int mode) 2401da177e4SLinus Torvalds { 2411da177e4SLinus Torvalds struct inode *inode; 2421da177e4SLinus Torvalds struct coda_vattr attrs; 2431da177e4SLinus Torvalds const char *name = de->d_name.name; 2441da177e4SLinus Torvalds int len = de->d_name.len; 2451da177e4SLinus Torvalds int error; 2461da177e4SLinus Torvalds struct CodaFid newfid; 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds lock_kernel(); 2491da177e4SLinus Torvalds coda_vfs_stat.mkdir++; 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds if (coda_isroot(dir) && coda_iscontrol(name, len)) { 2521da177e4SLinus Torvalds unlock_kernel(); 2531da177e4SLinus Torvalds return -EPERM; 2541da177e4SLinus Torvalds } 2551da177e4SLinus Torvalds 2561da177e4SLinus Torvalds attrs.va_mode = mode; 2571da177e4SLinus Torvalds error = venus_mkdir(dir->i_sb, coda_i2f(dir), 2581da177e4SLinus Torvalds name, len, &newfid, &attrs); 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds if ( error ) { 2611da177e4SLinus Torvalds unlock_kernel(); 2621da177e4SLinus Torvalds d_drop(de); 2631da177e4SLinus Torvalds return error; 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds inode = coda_iget(dir->i_sb, &newfid, &attrs); 2671da177e4SLinus Torvalds if ( IS_ERR(inode) ) { 2681da177e4SLinus Torvalds unlock_kernel(); 2691da177e4SLinus Torvalds d_drop(de); 2701da177e4SLinus Torvalds return PTR_ERR(inode); 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds /* invalidate the directory cnode's attributes */ 274d728900cSJan Harkes coda_dir_inc_nlink(dir); 275d728900cSJan Harkes coda_dir_update_mtime(dir); 2761da177e4SLinus Torvalds unlock_kernel(); 2771da177e4SLinus Torvalds d_instantiate(de, inode); 2781da177e4SLinus Torvalds return 0; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds /* try to make de an entry in dir_inodde linked to source_de */ 2821da177e4SLinus Torvalds static int coda_link(struct dentry *source_de, struct inode *dir_inode, 2831da177e4SLinus Torvalds struct dentry *de) 2841da177e4SLinus Torvalds { 2851da177e4SLinus Torvalds struct inode *inode = source_de->d_inode; 2861da177e4SLinus Torvalds const char * name = de->d_name.name; 2871da177e4SLinus Torvalds int len = de->d_name.len; 2881da177e4SLinus Torvalds int error; 2891da177e4SLinus Torvalds 2901da177e4SLinus Torvalds lock_kernel(); 2911da177e4SLinus Torvalds coda_vfs_stat.link++; 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) { 2941da177e4SLinus Torvalds unlock_kernel(); 2951da177e4SLinus Torvalds return -EPERM; 2961da177e4SLinus Torvalds } 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds error = venus_link(dir_inode->i_sb, coda_i2f(inode), 2991da177e4SLinus Torvalds coda_i2f(dir_inode), (const char *)name, len); 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds if (error) { 3021da177e4SLinus Torvalds d_drop(de); 3031da177e4SLinus Torvalds goto out; 3041da177e4SLinus Torvalds } 3051da177e4SLinus Torvalds 306d728900cSJan Harkes coda_dir_update_mtime(dir_inode); 3071da177e4SLinus Torvalds atomic_inc(&inode->i_count); 3081da177e4SLinus Torvalds d_instantiate(de, inode); 309d8c76e6fSDave Hansen inc_nlink(inode); 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds out: 3121da177e4SLinus Torvalds unlock_kernel(); 3131da177e4SLinus Torvalds return(error); 3141da177e4SLinus Torvalds } 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvalds static int coda_symlink(struct inode *dir_inode, struct dentry *de, 3181da177e4SLinus Torvalds const char *symname) 3191da177e4SLinus Torvalds { 3201da177e4SLinus Torvalds const char *name = de->d_name.name; 3211da177e4SLinus Torvalds int len = de->d_name.len; 3221da177e4SLinus Torvalds int symlen; 3231da177e4SLinus Torvalds int error=0; 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds lock_kernel(); 3261da177e4SLinus Torvalds coda_vfs_stat.symlink++; 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) { 3291da177e4SLinus Torvalds unlock_kernel(); 3301da177e4SLinus Torvalds return -EPERM; 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds symlen = strlen(symname); 3341da177e4SLinus Torvalds if ( symlen > CODA_MAXPATHLEN ) { 3351da177e4SLinus Torvalds unlock_kernel(); 3361da177e4SLinus Torvalds return -ENAMETOOLONG; 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds /* 3401da177e4SLinus Torvalds * This entry is now negative. Since we do not create 3411da177e4SLinus Torvalds * an inode for the entry we have to drop it. 3421da177e4SLinus Torvalds */ 3431da177e4SLinus Torvalds d_drop(de); 3441da177e4SLinus Torvalds error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len, 3451da177e4SLinus Torvalds symname, symlen); 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds /* mtime is no good anymore */ 3481da177e4SLinus Torvalds if ( !error ) 349d728900cSJan Harkes coda_dir_update_mtime(dir_inode); 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds unlock_kernel(); 3521da177e4SLinus Torvalds return error; 3531da177e4SLinus Torvalds } 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds /* destruction routines: unlink, rmdir */ 3561da177e4SLinus Torvalds int coda_unlink(struct inode *dir, struct dentry *de) 3571da177e4SLinus Torvalds { 3581da177e4SLinus Torvalds int error; 3591da177e4SLinus Torvalds const char *name = de->d_name.name; 3601da177e4SLinus Torvalds int len = de->d_name.len; 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds lock_kernel(); 3631da177e4SLinus Torvalds coda_vfs_stat.unlink++; 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds error = venus_remove(dir->i_sb, coda_i2f(dir), name, len); 3661da177e4SLinus Torvalds if ( error ) { 3671da177e4SLinus Torvalds unlock_kernel(); 3681da177e4SLinus Torvalds return error; 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds 371d728900cSJan Harkes coda_dir_update_mtime(dir); 3729a53c3a7SDave Hansen drop_nlink(de->d_inode); 3731da177e4SLinus Torvalds unlock_kernel(); 3741da177e4SLinus Torvalds return 0; 3751da177e4SLinus Torvalds } 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds int coda_rmdir(struct inode *dir, struct dentry *de) 3781da177e4SLinus Torvalds { 3791da177e4SLinus Torvalds const char *name = de->d_name.name; 3801da177e4SLinus Torvalds int len = de->d_name.len; 3811da177e4SLinus Torvalds int error; 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds lock_kernel(); 3841da177e4SLinus Torvalds coda_vfs_stat.rmdir++; 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len); 3878c6d2152SJan Harkes if (!error) { 3888c6d2152SJan Harkes /* VFS may delete the child */ 3898c6d2152SJan Harkes if (de->d_inode) 3908c6d2152SJan Harkes de->d_inode->i_nlink = 0; 3911da177e4SLinus Torvalds 3928c6d2152SJan Harkes /* fix the link count of the parent */ 393d728900cSJan Harkes coda_dir_drop_nlink(dir); 394d728900cSJan Harkes coda_dir_update_mtime(dir); 3958c6d2152SJan Harkes } 3961da177e4SLinus Torvalds unlock_kernel(); 3978c6d2152SJan Harkes return error; 3981da177e4SLinus Torvalds } 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds /* rename */ 4011da177e4SLinus Torvalds static int coda_rename(struct inode *old_dir, struct dentry *old_dentry, 4021da177e4SLinus Torvalds struct inode *new_dir, struct dentry *new_dentry) 4031da177e4SLinus Torvalds { 4041da177e4SLinus Torvalds const char *old_name = old_dentry->d_name.name; 4051da177e4SLinus Torvalds const char *new_name = new_dentry->d_name.name; 4061da177e4SLinus Torvalds int old_length = old_dentry->d_name.len; 4071da177e4SLinus Torvalds int new_length = new_dentry->d_name.len; 4081da177e4SLinus Torvalds int error; 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds lock_kernel(); 4111da177e4SLinus Torvalds coda_vfs_stat.rename++; 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds error = venus_rename(old_dir->i_sb, coda_i2f(old_dir), 4141da177e4SLinus Torvalds coda_i2f(new_dir), old_length, new_length, 4151da177e4SLinus Torvalds (const char *) old_name, (const char *)new_name); 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds if ( !error ) { 4181da177e4SLinus Torvalds if ( new_dentry->d_inode ) { 419d728900cSJan Harkes if ( S_ISDIR(new_dentry->d_inode->i_mode) ) { 420d728900cSJan Harkes coda_dir_drop_nlink(old_dir); 421d728900cSJan Harkes coda_dir_inc_nlink(new_dir); 422d728900cSJan Harkes } 423d728900cSJan Harkes coda_dir_update_mtime(old_dir); 424d728900cSJan Harkes coda_dir_update_mtime(new_dir); 4251da177e4SLinus Torvalds coda_flag_inode(new_dentry->d_inode, C_VATTR); 4261da177e4SLinus Torvalds } else { 4271da177e4SLinus Torvalds coda_flag_inode(old_dir, C_VATTR); 4281da177e4SLinus Torvalds coda_flag_inode(new_dir, C_VATTR); 4291da177e4SLinus Torvalds } 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds unlock_kernel(); 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds return error; 4341da177e4SLinus Torvalds } 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds /* file operations for directories */ 43897875253SJan Harkes int coda_readdir(struct file *coda_file, void *buf, filldir_t filldir) 4391da177e4SLinus Torvalds { 4401da177e4SLinus Torvalds struct coda_file_info *cfi; 4411da177e4SLinus Torvalds struct file *host_file; 4421da177e4SLinus Torvalds int ret; 4431da177e4SLinus Torvalds 4441da177e4SLinus Torvalds cfi = CODA_FTOC(coda_file); 4451da177e4SLinus Torvalds BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); 4461da177e4SLinus Torvalds host_file = cfi->cfi_container; 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds coda_vfs_stat.readdir++; 4491da177e4SLinus Torvalds 45097875253SJan Harkes if (!host_file->f_op) 45197875253SJan Harkes return -ENOTDIR; 45297875253SJan Harkes 45397875253SJan Harkes if (host_file->f_op->readdir) 45497875253SJan Harkes { 45597875253SJan Harkes /* potemkin case: we were handed a directory inode. 45697875253SJan Harkes * We can't use vfs_readdir because we have to keep the file 45797875253SJan Harkes * position in sync between the coda_file and the host_file. 45897875253SJan Harkes * and as such we need grab the inode mutex. */ 45997875253SJan Harkes struct inode *host_inode = host_file->f_path.dentry->d_inode; 46097875253SJan Harkes 4611b1dcc1bSJes Sorensen mutex_lock(&host_inode->i_mutex); 4621da177e4SLinus Torvalds host_file->f_pos = coda_file->f_pos; 4631da177e4SLinus Torvalds 4641da177e4SLinus Torvalds ret = -ENOENT; 4651da177e4SLinus Torvalds if (!IS_DEADDIR(host_inode)) { 46697875253SJan Harkes ret = host_file->f_op->readdir(host_file, buf, filldir); 4671da177e4SLinus Torvalds file_accessed(host_file); 4681da177e4SLinus Torvalds } 46997875253SJan Harkes 4701da177e4SLinus Torvalds coda_file->f_pos = host_file->f_pos; 4711b1dcc1bSJes Sorensen mutex_unlock(&host_inode->i_mutex); 47297875253SJan Harkes } 47397875253SJan Harkes else /* Venus: we must read Venus dirents from a file */ 47497875253SJan Harkes ret = coda_venus_readdir(coda_file, buf, filldir); 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds return ret; 4771da177e4SLinus Torvalds } 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds static inline unsigned int CDT2DT(unsigned char cdt) 4801da177e4SLinus Torvalds { 4811da177e4SLinus Torvalds unsigned int dt; 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds switch(cdt) { 4841da177e4SLinus Torvalds case CDT_UNKNOWN: dt = DT_UNKNOWN; break; 4851da177e4SLinus Torvalds case CDT_FIFO: dt = DT_FIFO; break; 4861da177e4SLinus Torvalds case CDT_CHR: dt = DT_CHR; break; 4871da177e4SLinus Torvalds case CDT_DIR: dt = DT_DIR; break; 4881da177e4SLinus Torvalds case CDT_BLK: dt = DT_BLK; break; 4891da177e4SLinus Torvalds case CDT_REG: dt = DT_REG; break; 4901da177e4SLinus Torvalds case CDT_LNK: dt = DT_LNK; break; 4911da177e4SLinus Torvalds case CDT_SOCK: dt = DT_SOCK; break; 4921da177e4SLinus Torvalds case CDT_WHT: dt = DT_WHT; break; 4931da177e4SLinus Torvalds default: dt = DT_UNKNOWN; break; 4941da177e4SLinus Torvalds } 4951da177e4SLinus Torvalds return dt; 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds 4981da177e4SLinus Torvalds /* support routines */ 49997875253SJan Harkes static int coda_venus_readdir(struct file *coda_file, void *buf, 50097875253SJan Harkes filldir_t filldir) 5011da177e4SLinus Torvalds { 5021da177e4SLinus Torvalds int result = 0; /* # of entries returned */ 50397875253SJan Harkes struct coda_file_info *cfi; 50497875253SJan Harkes struct coda_inode_info *cii; 50597875253SJan Harkes struct file *host_file; 50697875253SJan Harkes struct dentry *de; 5071da177e4SLinus Torvalds struct venus_dirent *vdir; 5081da177e4SLinus Torvalds unsigned long vdir_size = 5091da177e4SLinus Torvalds (unsigned long)(&((struct venus_dirent *)0)->d_name); 5101da177e4SLinus Torvalds unsigned int type; 5111da177e4SLinus Torvalds struct qstr name; 5121da177e4SLinus Torvalds ino_t ino; 51397875253SJan Harkes int ret; 51497875253SJan Harkes 51597875253SJan Harkes cfi = CODA_FTOC(coda_file); 51697875253SJan Harkes BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); 51797875253SJan Harkes host_file = cfi->cfi_container; 51897875253SJan Harkes 51997875253SJan Harkes de = coda_file->f_path.dentry; 52097875253SJan Harkes cii = ITOC(de->d_inode); 5211da177e4SLinus Torvalds 522f52720caSPanagiotis Issaris vdir = kmalloc(sizeof(*vdir), GFP_KERNEL); 5231da177e4SLinus Torvalds if (!vdir) return -ENOMEM; 5241da177e4SLinus Torvalds 52597875253SJan Harkes switch (coda_file->f_pos) { 5261da177e4SLinus Torvalds case 0: 52797875253SJan Harkes ret = filldir(buf, ".", 1, 0, de->d_inode->i_ino, DT_DIR); 5281da177e4SLinus Torvalds if (ret < 0) break; 5291da177e4SLinus Torvalds result++; 53097875253SJan Harkes coda_file->f_pos++; 5311da177e4SLinus Torvalds /* fallthrough */ 5321da177e4SLinus Torvalds case 1: 53397875253SJan Harkes ret = filldir(buf, "..", 2, 1, de->d_parent->d_inode->i_ino, DT_DIR); 5341da177e4SLinus Torvalds if (ret < 0) break; 5351da177e4SLinus Torvalds result++; 53697875253SJan Harkes coda_file->f_pos++; 5371da177e4SLinus Torvalds /* fallthrough */ 5381da177e4SLinus Torvalds default: 5391da177e4SLinus Torvalds while (1) { 5401da177e4SLinus Torvalds /* read entries from the directory file */ 54197875253SJan Harkes ret = kernel_read(host_file, coda_file->f_pos - 2, (char *)vdir, 5421da177e4SLinus Torvalds sizeof(*vdir)); 5431da177e4SLinus Torvalds if (ret < 0) { 54497875253SJan Harkes printk(KERN_ERR "coda readdir: read dir %s failed %d\n", 54597875253SJan Harkes coda_f2s(&cii->c_fid), ret); 5461da177e4SLinus Torvalds break; 5471da177e4SLinus Torvalds } 5481da177e4SLinus Torvalds if (ret == 0) break; /* end of directory file reached */ 5491da177e4SLinus Torvalds 5501da177e4SLinus Torvalds /* catch truncated reads */ 5511da177e4SLinus Torvalds if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) { 55297875253SJan Harkes printk(KERN_ERR "coda readdir: short read on %s\n", 55397875253SJan Harkes coda_f2s(&cii->c_fid)); 5541da177e4SLinus Torvalds ret = -EBADF; 5551da177e4SLinus Torvalds break; 5561da177e4SLinus Torvalds } 5571da177e4SLinus Torvalds /* validate whether the directory file actually makes sense */ 5581da177e4SLinus Torvalds if (vdir->d_reclen < vdir_size + vdir->d_namlen) { 55997875253SJan Harkes printk(KERN_ERR "coda readdir: invalid dir %s\n", 56097875253SJan Harkes coda_f2s(&cii->c_fid)); 5611da177e4SLinus Torvalds ret = -EBADF; 5621da177e4SLinus Torvalds break; 5631da177e4SLinus Torvalds } 5641da177e4SLinus Torvalds 5651da177e4SLinus Torvalds name.len = vdir->d_namlen; 5661da177e4SLinus Torvalds name.name = vdir->d_name; 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds /* Make sure we skip '.' and '..', we already got those */ 5691da177e4SLinus Torvalds if (name.name[0] == '.' && (name.len == 1 || 5701da177e4SLinus Torvalds (vdir->d_name[1] == '.' && name.len == 2))) 5711da177e4SLinus Torvalds vdir->d_fileno = name.len = 0; 5721da177e4SLinus Torvalds 5731da177e4SLinus Torvalds /* skip null entries */ 5741da177e4SLinus Torvalds if (vdir->d_fileno && name.len) { 5751da177e4SLinus Torvalds /* try to look up this entry in the dcache, that way 5761da177e4SLinus Torvalds * userspace doesn't have to worry about breaking 5771da177e4SLinus Torvalds * getcwd by having mismatched inode numbers for 5781da177e4SLinus Torvalds * internal volume mountpoints. */ 57997875253SJan Harkes ino = find_inode_number(de, &name); 5801da177e4SLinus Torvalds if (!ino) ino = vdir->d_fileno; 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds type = CDT2DT(vdir->d_type); 58397875253SJan Harkes ret = filldir(buf, name.name, name.len, 58497875253SJan Harkes coda_file->f_pos, ino, type); 5851da177e4SLinus Torvalds /* failure means no space for filling in this round */ 5861da177e4SLinus Torvalds if (ret < 0) break; 5871da177e4SLinus Torvalds result++; 5881da177e4SLinus Torvalds } 5891da177e4SLinus Torvalds /* we'll always have progress because d_reclen is unsigned and 5901da177e4SLinus Torvalds * we've already established it is non-zero. */ 59197875253SJan Harkes coda_file->f_pos += vdir->d_reclen; 5921da177e4SLinus Torvalds } 5931da177e4SLinus Torvalds } 5941da177e4SLinus Torvalds kfree(vdir); 5951da177e4SLinus Torvalds return result ? result : ret; 5961da177e4SLinus Torvalds } 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds /* called when a cache lookup succeeds */ 5991da177e4SLinus Torvalds static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd) 6001da177e4SLinus Torvalds { 6011da177e4SLinus Torvalds struct inode *inode = de->d_inode; 6021da177e4SLinus Torvalds struct coda_inode_info *cii; 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds if (!inode) 6051da177e4SLinus Torvalds return 1; 6061da177e4SLinus Torvalds lock_kernel(); 6071da177e4SLinus Torvalds if (coda_isroot(inode)) 6081da177e4SLinus Torvalds goto out; 6091da177e4SLinus Torvalds if (is_bad_inode(inode)) 6101da177e4SLinus Torvalds goto bad; 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds cii = ITOC(de->d_inode); 6131da177e4SLinus Torvalds if (!(cii->c_flags & (C_PURGE | C_FLUSH))) 6141da177e4SLinus Torvalds goto out; 6151da177e4SLinus Torvalds 6161da177e4SLinus Torvalds shrink_dcache_parent(de); 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds /* propagate for a flush */ 6191da177e4SLinus Torvalds if (cii->c_flags & C_FLUSH) 6201da177e4SLinus Torvalds coda_flag_inode_children(inode, C_FLUSH); 6211da177e4SLinus Torvalds 6221da177e4SLinus Torvalds if (atomic_read(&de->d_count) > 1) 6231da177e4SLinus Torvalds /* pretend it's valid, but don't change the flags */ 6241da177e4SLinus Torvalds goto out; 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds /* clear the flags. */ 6271da177e4SLinus Torvalds cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds bad: 6301da177e4SLinus Torvalds unlock_kernel(); 6311da177e4SLinus Torvalds return 0; 6321da177e4SLinus Torvalds out: 6331da177e4SLinus Torvalds unlock_kernel(); 6341da177e4SLinus Torvalds return 1; 6351da177e4SLinus Torvalds } 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds /* 6381da177e4SLinus Torvalds * This is the callback from dput() when d_count is going to 0. 6391da177e4SLinus Torvalds * We use this to unhash dentries with bad inodes. 6401da177e4SLinus Torvalds */ 6411da177e4SLinus Torvalds static int coda_dentry_delete(struct dentry * dentry) 6421da177e4SLinus Torvalds { 6431da177e4SLinus Torvalds int flags; 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds if (!dentry->d_inode) 6461da177e4SLinus Torvalds return 0; 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvalds flags = (ITOC(dentry->d_inode)->c_flags) & C_PURGE; 6491da177e4SLinus Torvalds if (is_bad_inode(dentry->d_inode) || flags) { 6501da177e4SLinus Torvalds return 1; 6511da177e4SLinus Torvalds } 6521da177e4SLinus Torvalds return 0; 6531da177e4SLinus Torvalds } 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds /* 6581da177e4SLinus Torvalds * This is called when we want to check if the inode has 6591da177e4SLinus Torvalds * changed on the server. Coda makes this easy since the 6601da177e4SLinus Torvalds * cache manager Venus issues a downcall to the kernel when this 6611da177e4SLinus Torvalds * happens 6621da177e4SLinus Torvalds */ 6631da177e4SLinus Torvalds int coda_revalidate_inode(struct dentry *dentry) 6641da177e4SLinus Torvalds { 6651da177e4SLinus Torvalds struct coda_vattr attr; 6661da177e4SLinus Torvalds int error = 0; 6671da177e4SLinus Torvalds int old_mode; 6681da177e4SLinus Torvalds ino_t old_ino; 6691da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 6701da177e4SLinus Torvalds struct coda_inode_info *cii = ITOC(inode); 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds lock_kernel(); 6731da177e4SLinus Torvalds if ( !cii->c_flags ) 6741da177e4SLinus Torvalds goto ok; 6751da177e4SLinus Torvalds 6761da177e4SLinus Torvalds if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) { 6771da177e4SLinus Torvalds error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr); 6781da177e4SLinus Torvalds if ( error ) 6791da177e4SLinus Torvalds goto return_bad; 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds /* this inode may be lost if: 6821da177e4SLinus Torvalds - it's ino changed 6831da177e4SLinus Torvalds - type changes must be permitted for repair and 6841da177e4SLinus Torvalds missing mount points. 6851da177e4SLinus Torvalds */ 6861da177e4SLinus Torvalds old_mode = inode->i_mode; 6871da177e4SLinus Torvalds old_ino = inode->i_ino; 6881da177e4SLinus Torvalds coda_vattr_to_iattr(inode, &attr); 6891da177e4SLinus Torvalds 6901da177e4SLinus Torvalds if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) { 6911da177e4SLinus Torvalds printk("Coda: inode %ld, fid %s changed type!\n", 6921da177e4SLinus Torvalds inode->i_ino, coda_f2s(&(cii->c_fid))); 6931da177e4SLinus Torvalds } 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds /* the following can happen when a local fid is replaced 6961da177e4SLinus Torvalds with a global one, here we lose and declare the inode bad */ 6971da177e4SLinus Torvalds if (inode->i_ino != old_ino) 6981da177e4SLinus Torvalds goto return_bad; 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds coda_flag_inode_children(inode, C_FLUSH); 7011da177e4SLinus Torvalds cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); 7021da177e4SLinus Torvalds } 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds ok: 7051da177e4SLinus Torvalds unlock_kernel(); 7061da177e4SLinus Torvalds return 0; 7071da177e4SLinus Torvalds 7081da177e4SLinus Torvalds return_bad: 7091da177e4SLinus Torvalds unlock_kernel(); 7101da177e4SLinus Torvalds return -EIO; 7111da177e4SLinus Torvalds } 712