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> 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds #include <asm/uaccess.h> 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds #include <linux/coda.h> 261da177e4SLinus Torvalds #include <linux/coda_psdev.h> 2731a203dfSAl Viro #include "coda_linux.h" 2831a203dfSAl Viro #include "coda_cache.h" 291da177e4SLinus Torvalds 30c98d8cfbSAdrian Bunk #include "coda_int.h" 31c98d8cfbSAdrian Bunk 321da177e4SLinus Torvalds /* dir inode-ops */ 33ebfc3b49SAl Viro static int coda_create(struct inode *dir, struct dentry *new, umode_t mode, bool excl); 3400cd8dd3SAl Viro static struct dentry *coda_lookup(struct inode *dir, struct dentry *target, unsigned int flags); 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); 4018bb1db3SAl Viro static int coda_mkdir(struct inode *dir_inode, struct dentry *entry, umode_t 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 */ 46e924f251SAl Viro static int coda_readdir(struct file *file, struct dir_context *ctx); 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds /* dentry ops */ 490b728e19SAl Viro static int coda_dentry_revalidate(struct dentry *de, unsigned int flags); 50fe15ce44SNick Piggin static int coda_dentry_delete(const struct dentry *); 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds /* support routines */ 53e924f251SAl Viro static int coda_venus_readdir(struct file *, struct dir_context *); 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds /* same as fs/bad_inode.c */ 561da177e4SLinus Torvalds static int coda_return_EIO(void) 571da177e4SLinus Torvalds { 581da177e4SLinus Torvalds return -EIO; 591da177e4SLinus Torvalds } 601da177e4SLinus Torvalds #define CODA_EIO_ERROR ((void *) (coda_return_EIO)) 611da177e4SLinus Torvalds 629501e4c4SAl Viro const struct dentry_operations coda_dentry_operations = 631da177e4SLinus Torvalds { 641da177e4SLinus Torvalds .d_revalidate = coda_dentry_revalidate, 651da177e4SLinus Torvalds .d_delete = coda_dentry_delete, 661da177e4SLinus Torvalds }; 671da177e4SLinus Torvalds 68754661f1SArjan van de Ven const struct inode_operations coda_dir_inode_operations = 691da177e4SLinus Torvalds { 701da177e4SLinus Torvalds .create = coda_create, 711da177e4SLinus Torvalds .lookup = coda_lookup, 721da177e4SLinus Torvalds .link = coda_link, 731da177e4SLinus Torvalds .unlink = coda_unlink, 741da177e4SLinus Torvalds .symlink = coda_symlink, 751da177e4SLinus Torvalds .mkdir = coda_mkdir, 761da177e4SLinus Torvalds .rmdir = coda_rmdir, 771da177e4SLinus Torvalds .mknod = CODA_EIO_ERROR, 781da177e4SLinus Torvalds .rename = coda_rename, 791da177e4SLinus Torvalds .permission = coda_permission, 801da177e4SLinus Torvalds .getattr = coda_getattr, 811da177e4SLinus Torvalds .setattr = coda_setattr, 821da177e4SLinus Torvalds }; 831da177e4SLinus Torvalds 844b6f5d20SArjan van de Ven const struct file_operations coda_dir_operations = { 851da177e4SLinus Torvalds .llseek = generic_file_llseek, 861da177e4SLinus Torvalds .read = generic_read_dir, 87e924f251SAl Viro .iterate = coda_readdir, 881da177e4SLinus Torvalds .open = coda_open, 891da177e4SLinus Torvalds .release = coda_release, 901da177e4SLinus Torvalds .fsync = coda_fsync, 911da177e4SLinus Torvalds }; 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds /* inode operations for directories */ 951da177e4SLinus Torvalds /* access routines: lookup, readlink, permission */ 9600cd8dd3SAl Viro static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, unsigned int flags) 971da177e4SLinus Torvalds { 98f4947fbcSAl Viro struct super_block *sb = dir->i_sb; 991da177e4SLinus Torvalds const char *name = entry->d_name.name; 1001da177e4SLinus Torvalds size_t length = entry->d_name.len; 101f4947fbcSAl Viro struct inode *inode; 102f4947fbcSAl Viro int type = 0; 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds if (length > CODA_MAXNAMLEN) { 105d9b4b319SFabian Frederick pr_err("name too long: lookup, %s (%*s)\n", 1061da177e4SLinus Torvalds coda_i2s(dir), (int)length, name); 1071da177e4SLinus Torvalds return ERR_PTR(-ENAMETOOLONG); 1081da177e4SLinus Torvalds } 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds /* control object, create inode on the fly */ 1111da177e4SLinus Torvalds if (coda_isroot(dir) && coda_iscontrol(name, length)) { 112f4947fbcSAl Viro inode = coda_cnode_makectl(sb); 113ed36f723SJan Harkes type = CODA_NOCACHE; 114f4947fbcSAl Viro } else { 115f4947fbcSAl Viro struct CodaFid fid = { { 0, } }; 116f4947fbcSAl Viro int error = venus_lookup(sb, coda_i2f(dir), name, length, 117f4947fbcSAl Viro &type, &fid); 118f4947fbcSAl Viro inode = !error ? coda_cnode_make(&fid, sb) : ERR_PTR(error); 1191da177e4SLinus Torvalds } 1201da177e4SLinus Torvalds 121f4947fbcSAl Viro if (!IS_ERR(inode) && (type & CODA_NOCACHE)) 122ed36f723SJan Harkes coda_flag_inode(inode, C_VATTR | C_PURGE); 123ed36f723SJan Harkes 124f4947fbcSAl Viro if (inode == ERR_PTR(-ENOENT)) 125f4947fbcSAl Viro inode = NULL; 126f4947fbcSAl Viro 127ed36f723SJan Harkes return d_splice_alias(inode, entry); 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds 13110556cb2SAl Viro int coda_permission(struct inode *inode, int mask) 1321da177e4SLinus Torvalds { 133f7cc02b8SYoshihisa Abe int error; 1341da177e4SLinus Torvalds 13510556cb2SAl Viro if (mask & MAY_NOT_BLOCK) 136b74c79e9SNick Piggin return -ECHILD; 137b74c79e9SNick Piggin 138e6305c43SAl Viro mask &= MAY_READ | MAY_WRITE | MAY_EXEC; 139e6305c43SAl Viro 1401da177e4SLinus Torvalds if (!mask) 1411da177e4SLinus Torvalds return 0; 1421da177e4SLinus Torvalds 143f696a365SMiklos Szeredi if ((mask & MAY_EXEC) && !execute_ok(inode)) 144f696a365SMiklos Szeredi return -EACCES; 145f696a365SMiklos Szeredi 1461da177e4SLinus Torvalds if (coda_cache_check(inode, mask)) 147f7cc02b8SYoshihisa Abe return 0; 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds error = venus_access(inode->i_sb, coda_i2f(inode), mask); 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds if (!error) 1521da177e4SLinus Torvalds coda_cache_enter(inode, mask); 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds return error; 1551da177e4SLinus Torvalds } 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds 158d728900cSJan Harkes static inline void coda_dir_update_mtime(struct inode *dir) 1591da177e4SLinus Torvalds { 1601da177e4SLinus Torvalds #ifdef REQUERY_VENUS_FOR_MTIME 1611da177e4SLinus Torvalds /* invalidate the directory cnode's attributes so we refetch the 1621da177e4SLinus Torvalds * attributes from venus next time the inode is referenced */ 1631da177e4SLinus Torvalds coda_flag_inode(dir, C_VATTR); 1641da177e4SLinus Torvalds #else 1651da177e4SLinus Torvalds /* optimistically we can also act as if our nose bleeds. The 1661da177e4SLinus Torvalds * granularity of the mtime is coarse anyways so we might actually be 1671da177e4SLinus Torvalds * right most of the time. Note: we only do this for directories. */ 1681da177e4SLinus Torvalds dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC; 1691da177e4SLinus Torvalds #endif 170d728900cSJan Harkes } 171d728900cSJan Harkes 172d728900cSJan Harkes /* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a 173d728900cSJan Harkes * trick to fool GNU find's optimizations. If we can't be sure of the link 174d728900cSJan Harkes * (because of volume mount points) we set i_nlink to 1 which forces find 175d728900cSJan Harkes * to consider every child as a possible directory. We should also never 176d728900cSJan Harkes * see an increment or decrement for deleted directories where i_nlink == 0 */ 177d728900cSJan Harkes static inline void coda_dir_inc_nlink(struct inode *dir) 178d728900cSJan Harkes { 179d728900cSJan Harkes if (dir->i_nlink >= 2) 180d728900cSJan Harkes inc_nlink(dir); 181d728900cSJan Harkes } 182d728900cSJan Harkes 183d728900cSJan Harkes static inline void coda_dir_drop_nlink(struct inode *dir) 184d728900cSJan Harkes { 185d728900cSJan Harkes if (dir->i_nlink > 2) 186d728900cSJan Harkes drop_nlink(dir); 1871da177e4SLinus Torvalds } 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds /* creation routines: create, mknod, mkdir, link, symlink */ 190ebfc3b49SAl Viro static int coda_create(struct inode *dir, struct dentry *de, umode_t mode, bool excl) 1911da177e4SLinus Torvalds { 192f7cc02b8SYoshihisa Abe int error; 1931da177e4SLinus Torvalds const char *name=de->d_name.name; 1941da177e4SLinus Torvalds int length=de->d_name.len; 1951da177e4SLinus Torvalds struct inode *inode; 1961da177e4SLinus Torvalds struct CodaFid newfid; 1971da177e4SLinus Torvalds struct coda_vattr attrs; 1981da177e4SLinus Torvalds 199f7cc02b8SYoshihisa Abe if (coda_isroot(dir) && coda_iscontrol(name, length)) 2001da177e4SLinus Torvalds return -EPERM; 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds error = venus_create(dir->i_sb, coda_i2f(dir), name, length, 2031da177e4SLinus Torvalds 0, mode, &newfid, &attrs); 204f7cc02b8SYoshihisa Abe if (error) 205f7cc02b8SYoshihisa Abe goto err_out; 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds inode = coda_iget(dir->i_sb, &newfid, &attrs); 2081da177e4SLinus Torvalds if (IS_ERR(inode)) { 209f7cc02b8SYoshihisa Abe error = PTR_ERR(inode); 210f7cc02b8SYoshihisa Abe goto err_out; 2111da177e4SLinus Torvalds } 2121da177e4SLinus Torvalds 2131da177e4SLinus Torvalds /* invalidate the directory cnode's attributes */ 214d728900cSJan Harkes coda_dir_update_mtime(dir); 2151da177e4SLinus Torvalds d_instantiate(de, inode); 2161da177e4SLinus Torvalds return 0; 217f7cc02b8SYoshihisa Abe err_out: 218f7cc02b8SYoshihisa Abe d_drop(de); 219f7cc02b8SYoshihisa Abe return error; 2201da177e4SLinus Torvalds } 2211da177e4SLinus Torvalds 22218bb1db3SAl Viro static int coda_mkdir(struct inode *dir, struct dentry *de, umode_t mode) 2231da177e4SLinus Torvalds { 2241da177e4SLinus Torvalds struct inode *inode; 2251da177e4SLinus Torvalds struct coda_vattr attrs; 2261da177e4SLinus Torvalds const char *name = de->d_name.name; 2271da177e4SLinus Torvalds int len = de->d_name.len; 2281da177e4SLinus Torvalds int error; 2291da177e4SLinus Torvalds struct CodaFid newfid; 2301da177e4SLinus Torvalds 231f7cc02b8SYoshihisa Abe if (coda_isroot(dir) && coda_iscontrol(name, len)) 2321da177e4SLinus Torvalds return -EPERM; 2331da177e4SLinus Torvalds 2341da177e4SLinus Torvalds attrs.va_mode = mode; 2351da177e4SLinus Torvalds error = venus_mkdir(dir->i_sb, coda_i2f(dir), 2361da177e4SLinus Torvalds name, len, &newfid, &attrs); 237f7cc02b8SYoshihisa Abe if (error) 238f7cc02b8SYoshihisa Abe goto err_out; 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds inode = coda_iget(dir->i_sb, &newfid, &attrs); 2411da177e4SLinus Torvalds if (IS_ERR(inode)) { 242f7cc02b8SYoshihisa Abe error = PTR_ERR(inode); 243f7cc02b8SYoshihisa Abe goto err_out; 2441da177e4SLinus Torvalds } 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds /* invalidate the directory cnode's attributes */ 247d728900cSJan Harkes coda_dir_inc_nlink(dir); 248d728900cSJan Harkes coda_dir_update_mtime(dir); 2491da177e4SLinus Torvalds d_instantiate(de, inode); 2501da177e4SLinus Torvalds return 0; 251f7cc02b8SYoshihisa Abe err_out: 252f7cc02b8SYoshihisa Abe d_drop(de); 253f7cc02b8SYoshihisa Abe return error; 2541da177e4SLinus Torvalds } 2551da177e4SLinus Torvalds 2561da177e4SLinus Torvalds /* try to make de an entry in dir_inodde linked to source_de */ 2571da177e4SLinus Torvalds static int coda_link(struct dentry *source_de, struct inode *dir_inode, 2581da177e4SLinus Torvalds struct dentry *de) 2591da177e4SLinus Torvalds { 2601da177e4SLinus Torvalds struct inode *inode = source_de->d_inode; 2611da177e4SLinus Torvalds const char * name = de->d_name.name; 2621da177e4SLinus Torvalds int len = de->d_name.len; 2631da177e4SLinus Torvalds int error; 2641da177e4SLinus Torvalds 265f7cc02b8SYoshihisa Abe if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) 2661da177e4SLinus Torvalds return -EPERM; 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds error = venus_link(dir_inode->i_sb, coda_i2f(inode), 2691da177e4SLinus Torvalds coda_i2f(dir_inode), (const char *)name, len); 2701da177e4SLinus Torvalds if (error) { 2711da177e4SLinus Torvalds d_drop(de); 272f7cc02b8SYoshihisa Abe return error; 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds 275d728900cSJan Harkes coda_dir_update_mtime(dir_inode); 2767de9c6eeSAl Viro ihold(inode); 2771da177e4SLinus Torvalds d_instantiate(de, inode); 278d8c76e6fSDave Hansen inc_nlink(inode); 279f7cc02b8SYoshihisa Abe return 0; 2801da177e4SLinus Torvalds } 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds static int coda_symlink(struct inode *dir_inode, struct dentry *de, 2841da177e4SLinus Torvalds const char *symname) 2851da177e4SLinus Torvalds { 2861da177e4SLinus Torvalds const char *name = de->d_name.name; 2871da177e4SLinus Torvalds int len = de->d_name.len; 2881da177e4SLinus Torvalds int symlen; 289f7cc02b8SYoshihisa Abe int error; 2901da177e4SLinus Torvalds 291f7cc02b8SYoshihisa Abe if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) 2921da177e4SLinus Torvalds return -EPERM; 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds symlen = strlen(symname); 295f7cc02b8SYoshihisa Abe if (symlen > CODA_MAXPATHLEN) 2961da177e4SLinus Torvalds return -ENAMETOOLONG; 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds /* 2991da177e4SLinus Torvalds * This entry is now negative. Since we do not create 3001da177e4SLinus Torvalds * an inode for the entry we have to drop it. 3011da177e4SLinus Torvalds */ 3021da177e4SLinus Torvalds d_drop(de); 3031da177e4SLinus Torvalds error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len, 3041da177e4SLinus Torvalds symname, symlen); 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds /* mtime is no good anymore */ 3071da177e4SLinus Torvalds if (!error) 308d728900cSJan Harkes coda_dir_update_mtime(dir_inode); 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds return error; 3111da177e4SLinus Torvalds } 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds /* destruction routines: unlink, rmdir */ 3149fe76c76SHarvey Harrison static int coda_unlink(struct inode *dir, struct dentry *de) 3151da177e4SLinus Torvalds { 3161da177e4SLinus Torvalds int error; 3171da177e4SLinus Torvalds const char *name = de->d_name.name; 3181da177e4SLinus Torvalds int len = de->d_name.len; 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds error = venus_remove(dir->i_sb, coda_i2f(dir), name, len); 321f7cc02b8SYoshihisa Abe if (error) 3221da177e4SLinus Torvalds return error; 3231da177e4SLinus Torvalds 324d728900cSJan Harkes coda_dir_update_mtime(dir); 3259a53c3a7SDave Hansen drop_nlink(de->d_inode); 3261da177e4SLinus Torvalds return 0; 3271da177e4SLinus Torvalds } 3281da177e4SLinus Torvalds 3299fe76c76SHarvey Harrison static int coda_rmdir(struct inode *dir, struct dentry *de) 3301da177e4SLinus Torvalds { 3311da177e4SLinus Torvalds const char *name = de->d_name.name; 3321da177e4SLinus Torvalds int len = de->d_name.len; 3331da177e4SLinus Torvalds int error; 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len); 3368c6d2152SJan Harkes if (!error) { 3378c6d2152SJan Harkes /* VFS may delete the child */ 3388c6d2152SJan Harkes if (de->d_inode) 3396d6b77f1SMiklos Szeredi clear_nlink(de->d_inode); 3401da177e4SLinus Torvalds 3418c6d2152SJan Harkes /* fix the link count of the parent */ 342d728900cSJan Harkes coda_dir_drop_nlink(dir); 343d728900cSJan Harkes coda_dir_update_mtime(dir); 3448c6d2152SJan Harkes } 3458c6d2152SJan Harkes return error; 3461da177e4SLinus Torvalds } 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds /* rename */ 3491da177e4SLinus Torvalds static int coda_rename(struct inode *old_dir, struct dentry *old_dentry, 3501da177e4SLinus Torvalds struct inode *new_dir, struct dentry *new_dentry) 3511da177e4SLinus Torvalds { 3521da177e4SLinus Torvalds const char *old_name = old_dentry->d_name.name; 3531da177e4SLinus Torvalds const char *new_name = new_dentry->d_name.name; 3541da177e4SLinus Torvalds int old_length = old_dentry->d_name.len; 3551da177e4SLinus Torvalds int new_length = new_dentry->d_name.len; 3561da177e4SLinus Torvalds int error; 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds error = venus_rename(old_dir->i_sb, coda_i2f(old_dir), 3591da177e4SLinus Torvalds coda_i2f(new_dir), old_length, new_length, 3601da177e4SLinus Torvalds (const char *) old_name, (const char *)new_name); 3611da177e4SLinus Torvalds if (!error) { 3621da177e4SLinus Torvalds if (new_dentry->d_inode) { 363d728900cSJan Harkes if (S_ISDIR(new_dentry->d_inode->i_mode)) { 364d728900cSJan Harkes coda_dir_drop_nlink(old_dir); 365d728900cSJan Harkes coda_dir_inc_nlink(new_dir); 366d728900cSJan Harkes } 367d728900cSJan Harkes coda_dir_update_mtime(old_dir); 368d728900cSJan Harkes coda_dir_update_mtime(new_dir); 3691da177e4SLinus Torvalds coda_flag_inode(new_dentry->d_inode, C_VATTR); 3701da177e4SLinus Torvalds } else { 3711da177e4SLinus Torvalds coda_flag_inode(old_dir, C_VATTR); 3721da177e4SLinus Torvalds coda_flag_inode(new_dir, C_VATTR); 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds } 3751da177e4SLinus Torvalds return error; 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds /* file operations for directories */ 380e924f251SAl Viro static int coda_readdir(struct file *coda_file, struct dir_context *ctx) 3811da177e4SLinus Torvalds { 3821da177e4SLinus Torvalds struct coda_file_info *cfi; 3831da177e4SLinus Torvalds struct file *host_file; 3841da177e4SLinus Torvalds int ret; 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds cfi = CODA_FTOC(coda_file); 3871da177e4SLinus Torvalds BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); 3881da177e4SLinus Torvalds host_file = cfi->cfi_container; 3891da177e4SLinus Torvalds 390e924f251SAl Viro if (host_file->f_op->iterate) { 391496ad9aaSAl Viro struct inode *host_inode = file_inode(host_file); 392bb6f619bSAl Viro mutex_lock(&host_inode->i_mutex); 393bb6f619bSAl Viro ret = -ENOENT; 394bb6f619bSAl Viro if (!IS_DEADDIR(host_inode)) { 395bb6f619bSAl Viro ret = host_file->f_op->iterate(host_file, ctx); 396bb6f619bSAl Viro file_accessed(host_file); 39797875253SJan Harkes } 398bb6f619bSAl Viro mutex_unlock(&host_inode->i_mutex); 3991da177e4SLinus Torvalds return ret; 4001da177e4SLinus Torvalds } 401e924f251SAl Viro /* Venus: we must read Venus dirents from a file */ 402e924f251SAl Viro return coda_venus_readdir(coda_file, ctx); 403e924f251SAl Viro } 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds static inline unsigned int CDT2DT(unsigned char cdt) 4061da177e4SLinus Torvalds { 4071da177e4SLinus Torvalds unsigned int dt; 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds switch(cdt) { 4101da177e4SLinus Torvalds case CDT_UNKNOWN: dt = DT_UNKNOWN; break; 4111da177e4SLinus Torvalds case CDT_FIFO: dt = DT_FIFO; break; 4121da177e4SLinus Torvalds case CDT_CHR: dt = DT_CHR; break; 4131da177e4SLinus Torvalds case CDT_DIR: dt = DT_DIR; break; 4141da177e4SLinus Torvalds case CDT_BLK: dt = DT_BLK; break; 4151da177e4SLinus Torvalds case CDT_REG: dt = DT_REG; break; 4161da177e4SLinus Torvalds case CDT_LNK: dt = DT_LNK; break; 4171da177e4SLinus Torvalds case CDT_SOCK: dt = DT_SOCK; break; 4181da177e4SLinus Torvalds case CDT_WHT: dt = DT_WHT; break; 4191da177e4SLinus Torvalds default: dt = DT_UNKNOWN; break; 4201da177e4SLinus Torvalds } 4211da177e4SLinus Torvalds return dt; 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds /* support routines */ 425e924f251SAl Viro static int coda_venus_readdir(struct file *coda_file, struct dir_context *ctx) 4261da177e4SLinus Torvalds { 42797875253SJan Harkes struct coda_file_info *cfi; 42897875253SJan Harkes struct coda_inode_info *cii; 42997875253SJan Harkes struct file *host_file; 43097875253SJan Harkes struct dentry *de; 4311da177e4SLinus Torvalds struct venus_dirent *vdir; 432ee60498fSAl Viro unsigned long vdir_size = offsetof(struct venus_dirent, d_name); 4331da177e4SLinus Torvalds unsigned int type; 4341da177e4SLinus Torvalds struct qstr name; 4351da177e4SLinus Torvalds ino_t ino; 43697875253SJan Harkes int ret; 43797875253SJan Harkes 43897875253SJan Harkes cfi = CODA_FTOC(coda_file); 43997875253SJan Harkes BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); 44097875253SJan Harkes host_file = cfi->cfi_container; 44197875253SJan Harkes 44297875253SJan Harkes de = coda_file->f_path.dentry; 44397875253SJan Harkes cii = ITOC(de->d_inode); 4441da177e4SLinus Torvalds 445f52720caSPanagiotis Issaris vdir = kmalloc(sizeof(*vdir), GFP_KERNEL); 4461da177e4SLinus Torvalds if (!vdir) return -ENOMEM; 4471da177e4SLinus Torvalds 448e924f251SAl Viro if (!dir_emit_dots(coda_file, ctx)) 4495f47c7eaSAl Viro goto out; 450e924f251SAl Viro 4511da177e4SLinus Torvalds while (1) { 4521da177e4SLinus Torvalds /* read entries from the directory file */ 453e924f251SAl Viro ret = kernel_read(host_file, ctx->pos - 2, (char *)vdir, 4541da177e4SLinus Torvalds sizeof(*vdir)); 4551da177e4SLinus Torvalds if (ret < 0) { 4566d6bd94fSFabian Frederick pr_err("%s: read dir %s failed %d\n", 4576d6bd94fSFabian Frederick __func__, coda_f2s(&cii->c_fid), ret); 4581da177e4SLinus Torvalds break; 4591da177e4SLinus Torvalds } 4601da177e4SLinus Torvalds if (ret == 0) break; /* end of directory file reached */ 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds /* catch truncated reads */ 4631da177e4SLinus Torvalds if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) { 4646d6bd94fSFabian Frederick pr_err("%s: short read on %s\n", 4656d6bd94fSFabian Frederick __func__, coda_f2s(&cii->c_fid)); 4661da177e4SLinus Torvalds ret = -EBADF; 4671da177e4SLinus Torvalds break; 4681da177e4SLinus Torvalds } 4691da177e4SLinus Torvalds /* validate whether the directory file actually makes sense */ 4701da177e4SLinus Torvalds if (vdir->d_reclen < vdir_size + vdir->d_namlen) { 4716d6bd94fSFabian Frederick pr_err("%s: invalid dir %s\n", 4726d6bd94fSFabian Frederick __func__, coda_f2s(&cii->c_fid)); 4731da177e4SLinus Torvalds ret = -EBADF; 4741da177e4SLinus Torvalds break; 4751da177e4SLinus Torvalds } 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds name.len = vdir->d_namlen; 4781da177e4SLinus Torvalds name.name = vdir->d_name; 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds /* Make sure we skip '.' and '..', we already got those */ 4811da177e4SLinus Torvalds if (name.name[0] == '.' && (name.len == 1 || 482e924f251SAl Viro (name.name[1] == '.' && name.len == 2))) 4831da177e4SLinus Torvalds vdir->d_fileno = name.len = 0; 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds /* skip null entries */ 4861da177e4SLinus Torvalds if (vdir->d_fileno && name.len) { 4876b5e1223SAl Viro ino = vdir->d_fileno; 4881da177e4SLinus Torvalds type = CDT2DT(vdir->d_type); 489e924f251SAl Viro if (!dir_emit(ctx, name.name, name.len, ino, type)) 490e924f251SAl Viro break; 4911da177e4SLinus Torvalds } 4921da177e4SLinus Torvalds /* we'll always have progress because d_reclen is unsigned and 4931da177e4SLinus Torvalds * we've already established it is non-zero. */ 494e924f251SAl Viro ctx->pos += vdir->d_reclen; 4951da177e4SLinus Torvalds } 4965f47c7eaSAl Viro out: 4971da177e4SLinus Torvalds kfree(vdir); 498e924f251SAl Viro return 0; 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds 5011da177e4SLinus Torvalds /* called when a cache lookup succeeds */ 5020b728e19SAl Viro static int coda_dentry_revalidate(struct dentry *de, unsigned int flags) 5031da177e4SLinus Torvalds { 50434286d66SNick Piggin struct inode *inode; 5051da177e4SLinus Torvalds struct coda_inode_info *cii; 5061da177e4SLinus Torvalds 5070b728e19SAl Viro if (flags & LOOKUP_RCU) 50834286d66SNick Piggin return -ECHILD; 50934286d66SNick Piggin 51034286d66SNick Piggin inode = de->d_inode; 511f7cc02b8SYoshihisa Abe if (!inode || coda_isroot(inode)) 5121da177e4SLinus Torvalds goto out; 5131da177e4SLinus Torvalds if (is_bad_inode(inode)) 5141da177e4SLinus Torvalds goto bad; 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds cii = ITOC(de->d_inode); 5171da177e4SLinus Torvalds if (!(cii->c_flags & (C_PURGE | C_FLUSH))) 5181da177e4SLinus Torvalds goto out; 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds shrink_dcache_parent(de); 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds /* propagate for a flush */ 5231da177e4SLinus Torvalds if (cii->c_flags & C_FLUSH) 5241da177e4SLinus Torvalds coda_flag_inode_children(inode, C_FLUSH); 5251da177e4SLinus Torvalds 52684d08fa8SAl Viro if (d_count(de) > 1) 5271da177e4SLinus Torvalds /* pretend it's valid, but don't change the flags */ 5281da177e4SLinus Torvalds goto out; 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds /* clear the flags. */ 531b5ce1d83SYoshihisa Abe spin_lock(&cii->c_lock); 5321da177e4SLinus Torvalds cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); 533b5ce1d83SYoshihisa Abe spin_unlock(&cii->c_lock); 5341da177e4SLinus Torvalds bad: 5351da177e4SLinus Torvalds return 0; 5361da177e4SLinus Torvalds out: 5371da177e4SLinus Torvalds return 1; 5381da177e4SLinus Torvalds } 5391da177e4SLinus Torvalds 5401da177e4SLinus Torvalds /* 5411da177e4SLinus Torvalds * This is the callback from dput() when d_count is going to 0. 5421da177e4SLinus Torvalds * We use this to unhash dentries with bad inodes. 5431da177e4SLinus Torvalds */ 544fe15ce44SNick Piggin static int coda_dentry_delete(const struct dentry * dentry) 5451da177e4SLinus Torvalds { 5461da177e4SLinus Torvalds int flags; 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds if (!dentry->d_inode) 5491da177e4SLinus Torvalds return 0; 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds flags = (ITOC(dentry->d_inode)->c_flags) & C_PURGE; 5521da177e4SLinus Torvalds if (is_bad_inode(dentry->d_inode) || flags) { 5531da177e4SLinus Torvalds return 1; 5541da177e4SLinus Torvalds } 5551da177e4SLinus Torvalds return 0; 5561da177e4SLinus Torvalds } 5571da177e4SLinus Torvalds 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds /* 5611da177e4SLinus Torvalds * This is called when we want to check if the inode has 5621da177e4SLinus Torvalds * changed on the server. Coda makes this easy since the 5631da177e4SLinus Torvalds * cache manager Venus issues a downcall to the kernel when this 5641da177e4SLinus Torvalds * happens 5651da177e4SLinus Torvalds */ 56611d100d9SAl Viro int coda_revalidate_inode(struct inode *inode) 5671da177e4SLinus Torvalds { 5681da177e4SLinus Torvalds struct coda_vattr attr; 569f7cc02b8SYoshihisa Abe int error; 5701da177e4SLinus Torvalds int old_mode; 5711da177e4SLinus Torvalds ino_t old_ino; 5721da177e4SLinus Torvalds struct coda_inode_info *cii = ITOC(inode); 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds if (!cii->c_flags) 575f7cc02b8SYoshihisa Abe return 0; 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) { 5781da177e4SLinus Torvalds error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr); 5791da177e4SLinus Torvalds if (error) 580f7cc02b8SYoshihisa Abe return -EIO; 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds /* this inode may be lost if: 5831da177e4SLinus Torvalds - it's ino changed 5841da177e4SLinus Torvalds - type changes must be permitted for repair and 5851da177e4SLinus Torvalds missing mount points. 5861da177e4SLinus Torvalds */ 5871da177e4SLinus Torvalds old_mode = inode->i_mode; 5881da177e4SLinus Torvalds old_ino = inode->i_ino; 5891da177e4SLinus Torvalds coda_vattr_to_iattr(inode, &attr); 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) { 592f38cfb25SFabian Frederick pr_warn("inode %ld, fid %s changed type!\n", 5931da177e4SLinus Torvalds inode->i_ino, coda_f2s(&(cii->c_fid))); 5941da177e4SLinus Torvalds } 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds /* the following can happen when a local fid is replaced 5971da177e4SLinus Torvalds with a global one, here we lose and declare the inode bad */ 5981da177e4SLinus Torvalds if (inode->i_ino != old_ino) 599f7cc02b8SYoshihisa Abe return -EIO; 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds coda_flag_inode_children(inode, C_FLUSH); 602b5ce1d83SYoshihisa Abe 603b5ce1d83SYoshihisa Abe spin_lock(&cii->c_lock); 6041da177e4SLinus Torvalds cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); 605b5ce1d83SYoshihisa Abe spin_unlock(&cii->c_lock); 6061da177e4SLinus Torvalds } 6071da177e4SLinus Torvalds return 0; 6081da177e4SLinus Torvalds } 609