11da177e4SLinus Torvalds /* dir.c: AFS filesystem directory handling 21da177e4SLinus Torvalds * 31da177e4SLinus Torvalds * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. 41da177e4SLinus Torvalds * Written by David Howells (dhowells@redhat.com) 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 71da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 81da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 91da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds #include <linux/kernel.h> 131da177e4SLinus Torvalds #include <linux/module.h> 141da177e4SLinus Torvalds #include <linux/init.h> 151da177e4SLinus Torvalds #include <linux/fs.h> 1634286d66SNick Piggin #include <linux/namei.h> 171da177e4SLinus Torvalds #include <linux/pagemap.h> 1800d3b7a4SDavid Howells #include <linux/ctype.h> 19e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 204d673da1SDavid Howells #include <linux/dns_resolver.h> 211da177e4SLinus Torvalds #include "internal.h" 221da177e4SLinus Torvalds 23260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 2400cd8dd3SAl Viro unsigned int flags); 254d673da1SDavid Howells static struct dentry *afs_dynroot_lookup(struct inode *dir, struct dentry *dentry, 264d673da1SDavid Howells unsigned int flags); 271da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file); 281bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx); 290b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); 30fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry); 31260a9803SDavid Howells static void afs_d_release(struct dentry *dentry); 325cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, 335cf9dd55SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 34ac7576f4SMiklos Szeredi static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, 35afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 364acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 37ebfc3b49SAl Viro bool excl); 3818bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); 39260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry); 40260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry); 41260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 42260a9803SDavid Howells struct dentry *dentry); 43260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 44260a9803SDavid Howells const char *content); 45260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 461cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 471cd66c93SMiklos Szeredi unsigned int flags); 481da177e4SLinus Torvalds 494b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 501da177e4SLinus Torvalds .open = afs_dir_open, 5100d3b7a4SDavid Howells .release = afs_release, 5229884effSAl Viro .iterate_shared = afs_readdir, 53e8d6c554SDavid Howells .lock = afs_lock, 543222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 551da177e4SLinus Torvalds }; 561da177e4SLinus Torvalds 57754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 58260a9803SDavid Howells .create = afs_create, 59260a9803SDavid Howells .lookup = afs_lookup, 60260a9803SDavid Howells .link = afs_link, 61260a9803SDavid Howells .unlink = afs_unlink, 62260a9803SDavid Howells .symlink = afs_symlink, 63260a9803SDavid Howells .mkdir = afs_mkdir, 64260a9803SDavid Howells .rmdir = afs_rmdir, 652773bf00SMiklos Szeredi .rename = afs_rename, 6600d3b7a4SDavid Howells .permission = afs_permission, 67416351f2SDavid Howells .getattr = afs_getattr, 6831143d5dSDavid Howells .setattr = afs_setattr, 69d3e3b7eaSDavid Howells .listxattr = afs_listxattr, 701da177e4SLinus Torvalds }; 711da177e4SLinus Torvalds 724d673da1SDavid Howells const struct file_operations afs_dynroot_file_operations = { 734d673da1SDavid Howells .open = dcache_dir_open, 744d673da1SDavid Howells .release = dcache_dir_close, 754d673da1SDavid Howells .iterate_shared = dcache_readdir, 764d673da1SDavid Howells .llseek = dcache_dir_lseek, 774d673da1SDavid Howells }; 784d673da1SDavid Howells 794d673da1SDavid Howells const struct inode_operations afs_dynroot_inode_operations = { 804d673da1SDavid Howells .lookup = afs_dynroot_lookup, 814d673da1SDavid Howells }; 824d673da1SDavid Howells 83d61dcce2SAl Viro const struct dentry_operations afs_fs_dentry_operations = { 841da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 851da177e4SLinus Torvalds .d_delete = afs_d_delete, 86260a9803SDavid Howells .d_release = afs_d_release, 87d18610b0SDavid Howells .d_automount = afs_d_automount, 881da177e4SLinus Torvalds }; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds #define AFS_DIR_HASHTBL_SIZE 128 911da177e4SLinus Torvalds #define AFS_DIR_DIRENT_SIZE 32 921da177e4SLinus Torvalds #define AFS_DIRENT_PER_BLOCK 64 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds union afs_dirent { 951da177e4SLinus Torvalds struct { 961da177e4SLinus Torvalds uint8_t valid; 971da177e4SLinus Torvalds uint8_t unused[1]; 981da177e4SLinus Torvalds __be16 hash_next; 991da177e4SLinus Torvalds __be32 vnode; 1001da177e4SLinus Torvalds __be32 unique; 1011da177e4SLinus Torvalds uint8_t name[16]; 1021da177e4SLinus Torvalds uint8_t overflow[4]; /* if any char of the name (inc 1031da177e4SLinus Torvalds * NUL) reaches here, consume 1041da177e4SLinus Torvalds * the next dirent too */ 1051da177e4SLinus Torvalds } u; 1061da177e4SLinus Torvalds uint8_t extended_name[32]; 1071da177e4SLinus Torvalds }; 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ 1101da177e4SLinus Torvalds struct afs_dir_pagehdr { 1111da177e4SLinus Torvalds __be16 npages; 1121da177e4SLinus Torvalds __be16 magic; 1131da177e4SLinus Torvalds #define AFS_DIR_MAGIC htons(1234) 1141da177e4SLinus Torvalds uint8_t nentries; 1151da177e4SLinus Torvalds uint8_t bitmap[8]; 1161da177e4SLinus Torvalds uint8_t pad[19]; 1171da177e4SLinus Torvalds }; 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvalds /* directory block layout */ 1201da177e4SLinus Torvalds union afs_dir_block { 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds struct { 1251da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1261da177e4SLinus Torvalds uint8_t alloc_ctrs[128]; 1271da177e4SLinus Torvalds /* dir hash table */ 1281da177e4SLinus Torvalds uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; 1291da177e4SLinus Torvalds } hdr; 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; 1321da177e4SLinus Torvalds }; 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds /* layout on a linux VM page */ 1351da177e4SLinus Torvalds struct afs_dir_page { 1361da177e4SLinus Torvalds union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; 1371da177e4SLinus Torvalds }; 1381da177e4SLinus Torvalds 1395cf9dd55SDavid Howells struct afs_lookup_one_cookie { 1405cf9dd55SDavid Howells struct dir_context ctx; 1415cf9dd55SDavid Howells struct qstr name; 1425cf9dd55SDavid Howells bool found; 1435cf9dd55SDavid Howells struct afs_fid fid; 1445cf9dd55SDavid Howells }; 1455cf9dd55SDavid Howells 146260a9803SDavid Howells struct afs_lookup_cookie { 1471bbae9f8SAl Viro struct dir_context ctx; 1481bbae9f8SAl Viro struct qstr name; 1495cf9dd55SDavid Howells bool found; 1505cf9dd55SDavid Howells bool one_only; 1515cf9dd55SDavid Howells unsigned short nr_fids; 1525cf9dd55SDavid Howells struct afs_file_status *statuses; 1535cf9dd55SDavid Howells struct afs_callback *callbacks; 1545cf9dd55SDavid Howells struct afs_fid fids[50]; 1551da177e4SLinus Torvalds }; 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds /* 1581da177e4SLinus Torvalds * check that a directory page is valid 1591da177e4SLinus Torvalds */ 160dab17c1aSDavid Howells bool afs_dir_check_page(struct inode *dir, struct page *page) 1611da177e4SLinus Torvalds { 1621da177e4SLinus Torvalds struct afs_dir_page *dbuf; 163dab17c1aSDavid Howells struct afs_vnode *vnode = AFS_FS_I(dir); 164dab17c1aSDavid Howells loff_t latter, i_size, off; 1651da177e4SLinus Torvalds int tmp, qty; 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds #if 0 1681da177e4SLinus Torvalds /* check the page count */ 1691da177e4SLinus Torvalds qty = desc.size / sizeof(dbuf->blocks[0]); 1701da177e4SLinus Torvalds if (qty == 0) 1711da177e4SLinus Torvalds goto error; 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { 1741da177e4SLinus Torvalds printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", 175530b6412SHarvey Harrison __func__, dir->i_ino, qty, 17608e0e7c8SDavid Howells ntohs(dbuf->blocks[0].pagehdr.npages)); 1771da177e4SLinus Torvalds goto error; 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds #endif 1801da177e4SLinus Torvalds 181dab17c1aSDavid Howells /* Determine how many magic numbers there should be in this page, but 182dab17c1aSDavid Howells * we must take care because the directory may change size under us. 183dab17c1aSDavid Howells */ 184dab17c1aSDavid Howells off = page_offset(page); 185dab17c1aSDavid Howells i_size = i_size_read(dir); 186dab17c1aSDavid Howells if (i_size <= off) 187dab17c1aSDavid Howells goto checked; 188dab17c1aSDavid Howells 189dab17c1aSDavid Howells latter = i_size - off; 1901da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1911da177e4SLinus Torvalds qty = PAGE_SIZE; 1921da177e4SLinus Torvalds else 1931da177e4SLinus Torvalds qty = latter; 1941da177e4SLinus Torvalds qty /= sizeof(union afs_dir_block); 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds /* check them */ 1971da177e4SLinus Torvalds dbuf = page_address(page); 1981da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 1991da177e4SLinus Torvalds if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { 200dab17c1aSDavid Howells printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", 201530b6412SHarvey Harrison __func__, dir->i_ino, tmp, qty, 2021da177e4SLinus Torvalds ntohs(dbuf->blocks[tmp].pagehdr.magic)); 203dab17c1aSDavid Howells trace_afs_dir_check_failed(vnode, off, i_size); 2041da177e4SLinus Torvalds goto error; 2051da177e4SLinus Torvalds } 2061da177e4SLinus Torvalds } 2071da177e4SLinus Torvalds 208dab17c1aSDavid Howells checked: 209d55b4da4SDavid Howells afs_stat_v(vnode, n_read_dir); 2101da177e4SLinus Torvalds SetPageChecked(page); 211be5b82dbSAl Viro return true; 2121da177e4SLinus Torvalds 2131da177e4SLinus Torvalds error: 2141da177e4SLinus Torvalds SetPageError(page); 215be5b82dbSAl Viro return false; 216ec26815aSDavid Howells } 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds /* 2191da177e4SLinus Torvalds * discard a page cached in the pagecache 2201da177e4SLinus Torvalds */ 2211da177e4SLinus Torvalds static inline void afs_dir_put_page(struct page *page) 2221da177e4SLinus Torvalds { 2231da177e4SLinus Torvalds kunmap(page); 224dab17c1aSDavid Howells unlock_page(page); 22509cbfeafSKirill A. Shutemov put_page(page); 226ec26815aSDavid Howells } 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds /* 2291da177e4SLinus Torvalds * get a page into the pagecache 2301da177e4SLinus Torvalds */ 23100d3b7a4SDavid Howells static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, 23200d3b7a4SDavid Howells struct key *key) 2331da177e4SLinus Torvalds { 2341da177e4SLinus Torvalds struct page *page; 2351da177e4SLinus Torvalds _enter("{%lu},%lu", dir->i_ino, index); 2361da177e4SLinus Torvalds 237f6d335c0SAl Viro page = read_cache_page(dir->i_mapping, index, afs_page_filler, key); 2381da177e4SLinus Torvalds if (!IS_ERR(page)) { 239dab17c1aSDavid Howells lock_page(page); 2401da177e4SLinus Torvalds kmap(page); 241be5b82dbSAl Viro if (unlikely(!PageChecked(page))) { 242dab17c1aSDavid Howells if (PageError(page)) 2431da177e4SLinus Torvalds goto fail; 2441da177e4SLinus Torvalds } 245be5b82dbSAl Viro } 2461da177e4SLinus Torvalds return page; 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds fail: 2491da177e4SLinus Torvalds afs_dir_put_page(page); 25008e0e7c8SDavid Howells _leave(" = -EIO"); 2511da177e4SLinus Torvalds return ERR_PTR(-EIO); 252ec26815aSDavid Howells } 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds /* 2551da177e4SLinus Torvalds * open an AFS directory file 2561da177e4SLinus Torvalds */ 2571da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 2581da177e4SLinus Torvalds { 2591da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 2601da177e4SLinus Torvalds 2612ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 2622ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 2631da177e4SLinus Torvalds 26408e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2651da177e4SLinus Torvalds return -ENOENT; 2661da177e4SLinus Torvalds 26700d3b7a4SDavid Howells return afs_open(inode, file); 268ec26815aSDavid Howells } 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds /* 2711da177e4SLinus Torvalds * deal with one block in an AFS directory 2721da177e4SLinus Torvalds */ 2731bbae9f8SAl Viro static int afs_dir_iterate_block(struct dir_context *ctx, 2741da177e4SLinus Torvalds union afs_dir_block *block, 2751bbae9f8SAl Viro unsigned blkoff) 2761da177e4SLinus Torvalds { 2771da177e4SLinus Torvalds union afs_dirent *dire; 2781da177e4SLinus Torvalds unsigned offset, next, curr; 2791da177e4SLinus Torvalds size_t nlen; 2801bbae9f8SAl Viro int tmp; 2811da177e4SLinus Torvalds 2821bbae9f8SAl Viro _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 2831da177e4SLinus Torvalds 2841bbae9f8SAl Viro curr = (ctx->pos - blkoff) / sizeof(union afs_dirent); 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 2871da177e4SLinus Torvalds for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; 2881da177e4SLinus Torvalds offset < AFS_DIRENT_PER_BLOCK; 2891da177e4SLinus Torvalds offset = next 2901da177e4SLinus Torvalds ) { 2911da177e4SLinus Torvalds next = offset + 1; 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 2941da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[offset / 8] & 2951da177e4SLinus Torvalds (1 << (offset % 8)))) { 2965b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: unused", 2971da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset); 2981da177e4SLinus Torvalds if (offset >= curr) 2991bbae9f8SAl Viro ctx->pos = blkoff + 3001da177e4SLinus Torvalds next * sizeof(union afs_dirent); 3011da177e4SLinus Torvalds continue; 3021da177e4SLinus Torvalds } 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds /* got a valid entry */ 3051da177e4SLinus Torvalds dire = &block->dirents[offset]; 3061da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 3071da177e4SLinus Torvalds sizeof(*block) - 3081da177e4SLinus Torvalds offset * sizeof(union afs_dirent)); 3091da177e4SLinus Torvalds 3105b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: %s %zu \"%s\"", 3111da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset, 3121da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 3131da177e4SLinus Torvalds nlen, dire->u.name); 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds /* work out where the next possible entry is */ 3161da177e4SLinus Torvalds for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { 3171da177e4SLinus Torvalds if (next >= AFS_DIRENT_PER_BLOCK) { 3185b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 3191da177e4SLinus Torvalds " %u travelled beyond end dir block" 3205b5e0928SAlexey Dobriyan " (len %u/%zu)", 3211da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 3221da177e4SLinus Torvalds offset, next, tmp, nlen); 3231da177e4SLinus Torvalds return -EIO; 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[next / 8] & 3261da177e4SLinus Torvalds (1 << (next % 8)))) { 3275b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 3285b5e0928SAlexey Dobriyan " %u unmarked extension (len %u/%zu)", 3291da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 3301da177e4SLinus Torvalds offset, next, tmp, nlen); 3311da177e4SLinus Torvalds return -EIO; 3321da177e4SLinus Torvalds } 3331da177e4SLinus Torvalds 3345b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: ext %u/%zu", 3351da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 3361da177e4SLinus Torvalds next, tmp, nlen); 3371da177e4SLinus Torvalds next++; 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds /* skip if starts before the current position */ 3411da177e4SLinus Torvalds if (offset < curr) 3421da177e4SLinus Torvalds continue; 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds /* found the next entry */ 3451bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 3461da177e4SLinus Torvalds ntohl(dire->u.vnode), 3475cf9dd55SDavid Howells (ctx->actor == afs_lookup_filldir || 3485cf9dd55SDavid Howells ctx->actor == afs_lookup_one_filldir)? 3491bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 3501da177e4SLinus Torvalds _leave(" = 0 [full]"); 3511da177e4SLinus Torvalds return 0; 3521da177e4SLinus Torvalds } 3531da177e4SLinus Torvalds 3541bbae9f8SAl Viro ctx->pos = blkoff + next * sizeof(union afs_dirent); 3551da177e4SLinus Torvalds } 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds _leave(" = 1 [more]"); 3581da177e4SLinus Torvalds return 1; 359ec26815aSDavid Howells } 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds /* 36208e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 3631da177e4SLinus Torvalds */ 3641bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 3651bbae9f8SAl Viro struct key *key) 3661da177e4SLinus Torvalds { 3671da177e4SLinus Torvalds union afs_dir_block *dblock; 3681da177e4SLinus Torvalds struct afs_dir_page *dbuf; 3691da177e4SLinus Torvalds struct page *page; 3701da177e4SLinus Torvalds unsigned blkoff, limit; 3711da177e4SLinus Torvalds int ret; 3721da177e4SLinus Torvalds 3731bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 3741da177e4SLinus Torvalds 37508e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 3761da177e4SLinus Torvalds _leave(" = -ESTALE"); 3771da177e4SLinus Torvalds return -ESTALE; 3781da177e4SLinus Torvalds } 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 3811bbae9f8SAl Viro ctx->pos += sizeof(union afs_dirent) - 1; 3821bbae9f8SAl Viro ctx->pos &= ~(sizeof(union afs_dirent) - 1); 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds /* walk through the blocks in sequence */ 3851da177e4SLinus Torvalds ret = 0; 3861bbae9f8SAl Viro while (ctx->pos < dir->i_size) { 3871bbae9f8SAl Viro blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1); 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds /* fetch the appropriate page from the directory */ 39000d3b7a4SDavid Howells page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); 3911da177e4SLinus Torvalds if (IS_ERR(page)) { 3921da177e4SLinus Torvalds ret = PTR_ERR(page); 3931da177e4SLinus Torvalds break; 3941da177e4SLinus Torvalds } 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 3971da177e4SLinus Torvalds 3981da177e4SLinus Torvalds dbuf = page_address(page); 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 4011da177e4SLinus Torvalds do { 4021da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 4031da177e4SLinus Torvalds sizeof(union afs_dir_block)]; 4041bbae9f8SAl Viro ret = afs_dir_iterate_block(ctx, dblock, blkoff); 4051da177e4SLinus Torvalds if (ret != 1) { 4061da177e4SLinus Torvalds afs_dir_put_page(page); 4071da177e4SLinus Torvalds goto out; 4081da177e4SLinus Torvalds } 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds blkoff += sizeof(union afs_dir_block); 4111da177e4SLinus Torvalds 4121bbae9f8SAl Viro } while (ctx->pos < dir->i_size && blkoff < limit); 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds afs_dir_put_page(page); 4151da177e4SLinus Torvalds ret = 0; 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds out: 4191da177e4SLinus Torvalds _leave(" = %d", ret); 4201da177e4SLinus Torvalds return ret; 421ec26815aSDavid Howells } 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds /* 4241da177e4SLinus Torvalds * read an AFS directory 4251da177e4SLinus Torvalds */ 4261bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx) 4271da177e4SLinus Torvalds { 428215804a9SDavid Howells return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); 429ec26815aSDavid Howells } 4301da177e4SLinus Torvalds 4311da177e4SLinus Torvalds /* 4325cf9dd55SDavid Howells * Search the directory for a single name 4331da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 4341da177e4SLinus Torvalds * uniquifier through dtype 4351da177e4SLinus Torvalds */ 4365cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, 437ac7576f4SMiklos Szeredi int nlen, loff_t fpos, u64 ino, unsigned dtype) 4381da177e4SLinus Torvalds { 4395cf9dd55SDavid Howells struct afs_lookup_one_cookie *cookie = 4405cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_one_cookie, ctx); 4411da177e4SLinus Torvalds 4421bbae9f8SAl Viro _enter("{%s,%u},%s,%u,,%llu,%u", 4431bbae9f8SAl Viro cookie->name.name, cookie->name.len, name, nlen, 444ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 4451da177e4SLinus Torvalds 44608e0e7c8SDavid Howells /* insanity checks first */ 44708e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 44808e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 44908e0e7c8SDavid Howells 4501bbae9f8SAl Viro if (cookie->name.len != nlen || 4511bbae9f8SAl Viro memcmp(cookie->name.name, name, nlen) != 0) { 4521da177e4SLinus Torvalds _leave(" = 0 [no]"); 4531da177e4SLinus Torvalds return 0; 4541da177e4SLinus Torvalds } 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds cookie->fid.vnode = ino; 4571da177e4SLinus Torvalds cookie->fid.unique = dtype; 4581da177e4SLinus Torvalds cookie->found = 1; 4591da177e4SLinus Torvalds 4601da177e4SLinus Torvalds _leave(" = -1 [found]"); 4611da177e4SLinus Torvalds return -1; 462ec26815aSDavid Howells } 4631da177e4SLinus Torvalds 4641da177e4SLinus Torvalds /* 4655cf9dd55SDavid Howells * Do a lookup of a single name in a directory 466260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 4671da177e4SLinus Torvalds */ 4685cf9dd55SDavid Howells static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, 46900d3b7a4SDavid Howells struct afs_fid *fid, struct key *key) 4701da177e4SLinus Torvalds { 4711bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 4725cf9dd55SDavid Howells struct afs_lookup_one_cookie cookie = { 4735cf9dd55SDavid Howells .ctx.actor = afs_lookup_one_filldir, 4741bbae9f8SAl Viro .name = dentry->d_name, 4751bbae9f8SAl Viro .fid.vid = as->volume->vid 4761bbae9f8SAl Viro }; 4771da177e4SLinus Torvalds int ret; 4781da177e4SLinus Torvalds 479a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds /* search the directory */ 4821bbae9f8SAl Viro ret = afs_dir_iterate(dir, &cookie.ctx, key); 4831da177e4SLinus Torvalds if (ret < 0) { 48408e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 48508e0e7c8SDavid Howells return ret; 4861da177e4SLinus Torvalds } 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds ret = -ENOENT; 4891da177e4SLinus Torvalds if (!cookie.found) { 49008e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 49108e0e7c8SDavid Howells return -ENOENT; 49208e0e7c8SDavid Howells } 49308e0e7c8SDavid Howells 49408e0e7c8SDavid Howells *fid = cookie.fid; 49508e0e7c8SDavid Howells _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); 49608e0e7c8SDavid Howells return 0; 49708e0e7c8SDavid Howells } 49808e0e7c8SDavid Howells 49908e0e7c8SDavid Howells /* 5005cf9dd55SDavid Howells * search the directory for a name 5015cf9dd55SDavid Howells * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5025cf9dd55SDavid Howells * uniquifier through dtype 5035cf9dd55SDavid Howells */ 5045cf9dd55SDavid Howells static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 5055cf9dd55SDavid Howells int nlen, loff_t fpos, u64 ino, unsigned dtype) 5065cf9dd55SDavid Howells { 5075cf9dd55SDavid Howells struct afs_lookup_cookie *cookie = 5085cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_cookie, ctx); 5095cf9dd55SDavid Howells int ret; 5105cf9dd55SDavid Howells 5115cf9dd55SDavid Howells _enter("{%s,%u},%s,%u,,%llu,%u", 5125cf9dd55SDavid Howells cookie->name.name, cookie->name.len, name, nlen, 5135cf9dd55SDavid Howells (unsigned long long) ino, dtype); 5145cf9dd55SDavid Howells 5155cf9dd55SDavid Howells /* insanity checks first */ 5165cf9dd55SDavid Howells BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 5175cf9dd55SDavid Howells BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 5185cf9dd55SDavid Howells 5195cf9dd55SDavid Howells if (cookie->found) { 5205cf9dd55SDavid Howells if (cookie->nr_fids < 50) { 5215cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].vnode = ino; 5225cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].unique = dtype; 5235cf9dd55SDavid Howells cookie->nr_fids++; 5245cf9dd55SDavid Howells } 5255cf9dd55SDavid Howells } else if (cookie->name.len == nlen && 5265cf9dd55SDavid Howells memcmp(cookie->name.name, name, nlen) == 0) { 5275cf9dd55SDavid Howells cookie->fids[0].vnode = ino; 5285cf9dd55SDavid Howells cookie->fids[0].unique = dtype; 5295cf9dd55SDavid Howells cookie->found = 1; 5305cf9dd55SDavid Howells if (cookie->one_only) 5315cf9dd55SDavid Howells return -1; 5325cf9dd55SDavid Howells } 5335cf9dd55SDavid Howells 5345cf9dd55SDavid Howells ret = cookie->nr_fids >= 50 ? -1 : 0; 5355cf9dd55SDavid Howells _leave(" = %d", ret); 5365cf9dd55SDavid Howells return ret; 5375cf9dd55SDavid Howells } 5385cf9dd55SDavid Howells 5395cf9dd55SDavid Howells /* 5405cf9dd55SDavid Howells * Do a lookup in a directory. We make use of bulk lookup to query a slew of 5415cf9dd55SDavid Howells * files in one go and create inodes for them. The inode of the file we were 5425cf9dd55SDavid Howells * asked for is returned. 5435cf9dd55SDavid Howells */ 5445cf9dd55SDavid Howells static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 5455cf9dd55SDavid Howells struct key *key) 5465cf9dd55SDavid Howells { 5475cf9dd55SDavid Howells struct afs_lookup_cookie *cookie; 5485cf9dd55SDavid Howells struct afs_cb_interest *cbi = NULL; 5495cf9dd55SDavid Howells struct afs_super_info *as = dir->i_sb->s_fs_info; 5505cf9dd55SDavid Howells struct afs_iget_data data; 5515cf9dd55SDavid Howells struct afs_fs_cursor fc; 5525cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 5535cf9dd55SDavid Howells struct inode *inode = NULL; 5545cf9dd55SDavid Howells int ret, i; 5555cf9dd55SDavid Howells 5565cf9dd55SDavid Howells _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 5575cf9dd55SDavid Howells 5585cf9dd55SDavid Howells cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 5595cf9dd55SDavid Howells if (!cookie) 5605cf9dd55SDavid Howells return ERR_PTR(-ENOMEM); 5615cf9dd55SDavid Howells 5625cf9dd55SDavid Howells cookie->ctx.actor = afs_lookup_filldir; 5635cf9dd55SDavid Howells cookie->name = dentry->d_name; 5645cf9dd55SDavid Howells cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ 5655cf9dd55SDavid Howells 5665cf9dd55SDavid Howells read_seqlock_excl(&dvnode->cb_lock); 5675cf9dd55SDavid Howells if (dvnode->cb_interest && 5685cf9dd55SDavid Howells dvnode->cb_interest->server && 5695cf9dd55SDavid Howells test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags)) 5705cf9dd55SDavid Howells cookie->one_only = true; 5715cf9dd55SDavid Howells read_sequnlock_excl(&dvnode->cb_lock); 5725cf9dd55SDavid Howells 5735cf9dd55SDavid Howells for (i = 0; i < 50; i++) 5745cf9dd55SDavid Howells cookie->fids[i].vid = as->volume->vid; 5755cf9dd55SDavid Howells 5765cf9dd55SDavid Howells /* search the directory */ 5775cf9dd55SDavid Howells ret = afs_dir_iterate(dir, &cookie->ctx, key); 5785cf9dd55SDavid Howells if (ret < 0) { 5795cf9dd55SDavid Howells inode = ERR_PTR(ret); 5805cf9dd55SDavid Howells goto out; 5815cf9dd55SDavid Howells } 5825cf9dd55SDavid Howells 5835cf9dd55SDavid Howells inode = ERR_PTR(-ENOENT); 5845cf9dd55SDavid Howells if (!cookie->found) 5855cf9dd55SDavid Howells goto out; 5865cf9dd55SDavid Howells 5875cf9dd55SDavid Howells /* Check to see if we already have an inode for the primary fid. */ 5885cf9dd55SDavid Howells data.volume = dvnode->volume; 5895cf9dd55SDavid Howells data.fid = cookie->fids[0]; 5905cf9dd55SDavid Howells inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); 5915cf9dd55SDavid Howells if (inode) 5925cf9dd55SDavid Howells goto out; 5935cf9dd55SDavid Howells 5945cf9dd55SDavid Howells /* Need space for examining all the selected files */ 5955cf9dd55SDavid Howells inode = ERR_PTR(-ENOMEM); 5965cf9dd55SDavid Howells cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status), 5975cf9dd55SDavid Howells GFP_KERNEL); 5985cf9dd55SDavid Howells if (!cookie->statuses) 5995cf9dd55SDavid Howells goto out; 6005cf9dd55SDavid Howells 6015cf9dd55SDavid Howells cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback), 6025cf9dd55SDavid Howells GFP_KERNEL); 6035cf9dd55SDavid Howells if (!cookie->callbacks) 6045cf9dd55SDavid Howells goto out_s; 6055cf9dd55SDavid Howells 6065cf9dd55SDavid Howells /* Try FS.InlineBulkStatus first. Abort codes for the individual 6075cf9dd55SDavid Howells * lookups contained therein are stored in the reply without aborting 6085cf9dd55SDavid Howells * the whole operation. 6095cf9dd55SDavid Howells */ 6105cf9dd55SDavid Howells if (cookie->one_only) 6115cf9dd55SDavid Howells goto no_inline_bulk_status; 6125cf9dd55SDavid Howells 6135cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 6145cf9dd55SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 6155cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 6165cf9dd55SDavid Howells if (test_bit(AFS_SERVER_FL_NO_IBULK, 6175cf9dd55SDavid Howells &fc.cbi->server->flags)) { 6185cf9dd55SDavid Howells fc.ac.abort_code = RX_INVALID_OPERATION; 6195cf9dd55SDavid Howells fc.ac.error = -ECONNABORTED; 6205cf9dd55SDavid Howells break; 6215cf9dd55SDavid Howells } 6225cf9dd55SDavid Howells afs_fs_inline_bulk_status(&fc, 6235cf9dd55SDavid Howells afs_v2net(dvnode), 6245cf9dd55SDavid Howells cookie->fids, 6255cf9dd55SDavid Howells cookie->statuses, 6265cf9dd55SDavid Howells cookie->callbacks, 6275cf9dd55SDavid Howells cookie->nr_fids, NULL); 6285cf9dd55SDavid Howells } 6295cf9dd55SDavid Howells 6305cf9dd55SDavid Howells if (fc.ac.error == 0) 6315cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 6325cf9dd55SDavid Howells if (fc.ac.abort_code == RX_INVALID_OPERATION) 6335cf9dd55SDavid Howells set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); 6345cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 6355cf9dd55SDavid Howells } 6365cf9dd55SDavid Howells 6375cf9dd55SDavid Howells if (!IS_ERR(inode)) 6385cf9dd55SDavid Howells goto success; 6395cf9dd55SDavid Howells if (fc.ac.abort_code != RX_INVALID_OPERATION) 6405cf9dd55SDavid Howells goto out_c; 6415cf9dd55SDavid Howells 6425cf9dd55SDavid Howells no_inline_bulk_status: 6435cf9dd55SDavid Howells /* We could try FS.BulkStatus next, but this aborts the entire op if 6445cf9dd55SDavid Howells * any of the lookups fails - so, for the moment, revert to 6455cf9dd55SDavid Howells * FS.FetchStatus for just the primary fid. 6465cf9dd55SDavid Howells */ 6475cf9dd55SDavid Howells cookie->nr_fids = 1; 6485cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 6495cf9dd55SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 6505cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 6515cf9dd55SDavid Howells afs_fs_fetch_status(&fc, 6525cf9dd55SDavid Howells afs_v2net(dvnode), 6535cf9dd55SDavid Howells cookie->fids, 6545cf9dd55SDavid Howells cookie->statuses, 6555cf9dd55SDavid Howells cookie->callbacks, 6565cf9dd55SDavid Howells NULL); 6575cf9dd55SDavid Howells } 6585cf9dd55SDavid Howells 6595cf9dd55SDavid Howells if (fc.ac.error == 0) 6605cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 6615cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 6625cf9dd55SDavid Howells } 6635cf9dd55SDavid Howells 6645cf9dd55SDavid Howells if (IS_ERR(inode)) 6655cf9dd55SDavid Howells goto out_c; 6665cf9dd55SDavid Howells 6675cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) 6685cf9dd55SDavid Howells cookie->statuses[i].abort_code = 0; 6695cf9dd55SDavid Howells 6705cf9dd55SDavid Howells success: 6715cf9dd55SDavid Howells /* Turn all the files into inodes and save the first one - which is the 6725cf9dd55SDavid Howells * one we actually want. 6735cf9dd55SDavid Howells */ 6745cf9dd55SDavid Howells if (cookie->statuses[0].abort_code != 0) 6755cf9dd55SDavid Howells inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code)); 6765cf9dd55SDavid Howells 6775cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) { 6785cf9dd55SDavid Howells struct inode *ti; 6795cf9dd55SDavid Howells 6805cf9dd55SDavid Howells if (cookie->statuses[i].abort_code != 0) 6815cf9dd55SDavid Howells continue; 6825cf9dd55SDavid Howells 6835cf9dd55SDavid Howells ti = afs_iget(dir->i_sb, key, &cookie->fids[i], 6845cf9dd55SDavid Howells &cookie->statuses[i], 6855cf9dd55SDavid Howells &cookie->callbacks[i], 6865cf9dd55SDavid Howells cbi); 6875cf9dd55SDavid Howells if (i == 0) { 6885cf9dd55SDavid Howells inode = ti; 6895cf9dd55SDavid Howells } else { 6905cf9dd55SDavid Howells if (!IS_ERR(ti)) 6915cf9dd55SDavid Howells iput(ti); 6925cf9dd55SDavid Howells } 6935cf9dd55SDavid Howells } 6945cf9dd55SDavid Howells 6955cf9dd55SDavid Howells out_c: 6965cf9dd55SDavid Howells afs_put_cb_interest(afs_v2net(dvnode), cbi); 6975cf9dd55SDavid Howells kfree(cookie->callbacks); 6985cf9dd55SDavid Howells out_s: 6995cf9dd55SDavid Howells kfree(cookie->statuses); 7005cf9dd55SDavid Howells out: 7015cf9dd55SDavid Howells kfree(cookie); 7025cf9dd55SDavid Howells return inode; 7035cf9dd55SDavid Howells } 7045cf9dd55SDavid Howells 7055cf9dd55SDavid Howells /* 7064d673da1SDavid Howells * Probe to see if a cell may exist. This prevents positive dentries from 7074d673da1SDavid Howells * being created unnecessarily. 7084d673da1SDavid Howells */ 7094d673da1SDavid Howells static int afs_probe_cell_name(struct dentry *dentry) 7104d673da1SDavid Howells { 7114d673da1SDavid Howells struct afs_cell *cell; 7124d673da1SDavid Howells const char *name = dentry->d_name.name; 7134d673da1SDavid Howells size_t len = dentry->d_name.len; 7144d673da1SDavid Howells int ret; 7154d673da1SDavid Howells 7164d673da1SDavid Howells /* Names prefixed with a dot are R/W mounts. */ 7174d673da1SDavid Howells if (name[0] == '.') { 7184d673da1SDavid Howells if (len == 1) 7194d673da1SDavid Howells return -EINVAL; 7204d673da1SDavid Howells name++; 7214d673da1SDavid Howells len--; 7224d673da1SDavid Howells } 7234d673da1SDavid Howells 7244d673da1SDavid Howells cell = afs_lookup_cell_rcu(afs_d2net(dentry), name, len); 7254d673da1SDavid Howells if (!IS_ERR(cell)) { 7264d673da1SDavid Howells afs_put_cell(afs_d2net(dentry), cell); 7274d673da1SDavid Howells return 0; 7284d673da1SDavid Howells } 7294d673da1SDavid Howells 7304d673da1SDavid Howells ret = dns_query("afsdb", name, len, "ipv4", NULL, NULL); 7314d673da1SDavid Howells if (ret == -ENODATA) 7324d673da1SDavid Howells ret = -EDESTADDRREQ; 7334d673da1SDavid Howells return ret; 7344d673da1SDavid Howells } 7354d673da1SDavid Howells 7364d673da1SDavid Howells /* 737bec5eb61Swanglei * Try to auto mount the mountpoint with pseudo directory, if the autocell 738bec5eb61Swanglei * operation is setted. 739bec5eb61Swanglei */ 7405cf9dd55SDavid Howells static struct inode *afs_try_auto_mntpt(struct dentry *dentry, struct inode *dir) 741bec5eb61Swanglei { 742bec5eb61Swanglei struct afs_vnode *vnode = AFS_FS_I(dir); 743bec5eb61Swanglei struct inode *inode; 7444d673da1SDavid Howells int ret = -ENOENT; 745bec5eb61Swanglei 7464d673da1SDavid Howells _enter("%p{%pd}, {%x:%u}", 7474d673da1SDavid Howells dentry, dentry, vnode->fid.vid, vnode->fid.vnode); 748bec5eb61Swanglei 7494d673da1SDavid Howells if (!test_bit(AFS_VNODE_AUTOCELL, &vnode->flags)) 750bec5eb61Swanglei goto out; 751bec5eb61Swanglei 7524d673da1SDavid Howells ret = afs_probe_cell_name(dentry); 7534d673da1SDavid Howells if (ret < 0) 7544d673da1SDavid Howells goto out; 7554d673da1SDavid Howells 7564d673da1SDavid Howells inode = afs_iget_pseudo_dir(dir->i_sb, false); 757bec5eb61Swanglei if (IS_ERR(inode)) { 758bec5eb61Swanglei ret = PTR_ERR(inode); 759bec5eb61Swanglei goto out; 760bec5eb61Swanglei } 761bec5eb61Swanglei 762bec5eb61Swanglei _leave("= %p", inode); 763bec5eb61Swanglei return inode; 764bec5eb61Swanglei 765bec5eb61Swanglei out: 766bec5eb61Swanglei _leave("= %d", ret); 767bec5eb61Swanglei return ERR_PTR(ret); 768bec5eb61Swanglei } 769bec5eb61Swanglei 770bec5eb61Swanglei /* 7716f8880d8SDavid Howells * Look up an entry in a directory with @sys substitution. 7726f8880d8SDavid Howells */ 7736f8880d8SDavid Howells static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 7746f8880d8SDavid Howells struct key *key) 7756f8880d8SDavid Howells { 7766f8880d8SDavid Howells struct afs_sysnames *subs; 7776f8880d8SDavid Howells struct afs_net *net = afs_i2net(dir); 7786f8880d8SDavid Howells struct dentry *ret; 7796f8880d8SDavid Howells char *buf, *p, *name; 7806f8880d8SDavid Howells int len, i; 7816f8880d8SDavid Howells 7826f8880d8SDavid Howells _enter(""); 7836f8880d8SDavid Howells 7846f8880d8SDavid Howells ret = ERR_PTR(-ENOMEM); 7856f8880d8SDavid Howells p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 7866f8880d8SDavid Howells if (!buf) 7876f8880d8SDavid Howells goto out_p; 7886f8880d8SDavid Howells if (dentry->d_name.len > 4) { 7896f8880d8SDavid Howells memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 7906f8880d8SDavid Howells p += dentry->d_name.len - 4; 7916f8880d8SDavid Howells } 7926f8880d8SDavid Howells 7936f8880d8SDavid Howells /* There is an ordered list of substitutes that we have to try. */ 7946f8880d8SDavid Howells read_lock(&net->sysnames_lock); 7956f8880d8SDavid Howells subs = net->sysnames; 7966f8880d8SDavid Howells refcount_inc(&subs->usage); 7976f8880d8SDavid Howells read_unlock(&net->sysnames_lock); 7986f8880d8SDavid Howells 7996f8880d8SDavid Howells for (i = 0; i < subs->nr; i++) { 8006f8880d8SDavid Howells name = subs->subs[i]; 8016f8880d8SDavid Howells len = dentry->d_name.len - 4 + strlen(name); 8026f8880d8SDavid Howells if (len >= AFSNAMEMAX) { 8036f8880d8SDavid Howells ret = ERR_PTR(-ENAMETOOLONG); 8046f8880d8SDavid Howells goto out_s; 8056f8880d8SDavid Howells } 8066f8880d8SDavid Howells 8076f8880d8SDavid Howells strcpy(p, name); 8086f8880d8SDavid Howells ret = lookup_one_len(buf, dentry->d_parent, len); 8096f8880d8SDavid Howells if (IS_ERR(ret) || d_is_positive(ret)) 8106f8880d8SDavid Howells goto out_s; 8116f8880d8SDavid Howells dput(ret); 8126f8880d8SDavid Howells } 8136f8880d8SDavid Howells 8146f8880d8SDavid Howells /* We don't want to d_add() the @sys dentry here as we don't want to 8156f8880d8SDavid Howells * the cached dentry to hide changes to the sysnames list. 8166f8880d8SDavid Howells */ 8176f8880d8SDavid Howells ret = NULL; 8186f8880d8SDavid Howells out_s: 8196f8880d8SDavid Howells afs_put_sysnames(subs); 8206f8880d8SDavid Howells kfree(buf); 8216f8880d8SDavid Howells out_p: 8226f8880d8SDavid Howells key_put(key); 8236f8880d8SDavid Howells return ret; 8246f8880d8SDavid Howells } 8256f8880d8SDavid Howells 8266f8880d8SDavid Howells /* 82708e0e7c8SDavid Howells * look up an entry in a directory 82808e0e7c8SDavid Howells */ 829260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 83000cd8dd3SAl Viro unsigned int flags) 83108e0e7c8SDavid Howells { 8325cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 83308e0e7c8SDavid Howells struct inode *inode; 83400d3b7a4SDavid Howells struct key *key; 83508e0e7c8SDavid Howells int ret; 83608e0e7c8SDavid Howells 837a455589fSAl Viro _enter("{%x:%u},%p{%pd},", 8385cf9dd55SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 839260a9803SDavid Howells 8402b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 84108e0e7c8SDavid Howells 84245222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 84308e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 84408e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 84508e0e7c8SDavid Howells } 84608e0e7c8SDavid Howells 8475cf9dd55SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 84808e0e7c8SDavid Howells _leave(" = -ESTALE"); 84908e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 85008e0e7c8SDavid Howells } 85108e0e7c8SDavid Howells 8525cf9dd55SDavid Howells key = afs_request_key(dvnode->volume->cell); 85300d3b7a4SDavid Howells if (IS_ERR(key)) { 85400d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 855e231c2eeSDavid Howells return ERR_CAST(key); 85600d3b7a4SDavid Howells } 85700d3b7a4SDavid Howells 8585cf9dd55SDavid Howells ret = afs_validate(dvnode, key); 85908e0e7c8SDavid Howells if (ret < 0) { 86000d3b7a4SDavid Howells key_put(key); 861260a9803SDavid Howells _leave(" = %d [val]", ret); 8621da177e4SLinus Torvalds return ERR_PTR(ret); 8631da177e4SLinus Torvalds } 8641da177e4SLinus Torvalds 8656f8880d8SDavid Howells if (dentry->d_name.len >= 4 && 8666f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 4] == '@' && 8676f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 3] == 's' && 8686f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 8696f8880d8SDavid Howells dentry->d_name.name[dentry->d_name.len - 1] == 's') 8706f8880d8SDavid Howells return afs_lookup_atsys(dir, dentry, key); 8716f8880d8SDavid Howells 872d55b4da4SDavid Howells afs_stat_v(dvnode, n_lookup); 8735cf9dd55SDavid Howells inode = afs_do_lookup(dir, dentry, key); 8745cf9dd55SDavid Howells if (IS_ERR(inode)) { 8755cf9dd55SDavid Howells ret = PTR_ERR(inode); 8764d673da1SDavid Howells if (ret == -ENOENT) { 8775cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 878bec5eb61Swanglei if (!IS_ERR(inode)) { 879bec5eb61Swanglei key_put(key); 880bec5eb61Swanglei goto success; 881bec5eb61Swanglei } 882bec5eb61Swanglei 883bec5eb61Swanglei ret = PTR_ERR(inode); 8844d673da1SDavid Howells } 8854d673da1SDavid Howells 886260a9803SDavid Howells key_put(key); 887260a9803SDavid Howells if (ret == -ENOENT) { 888260a9803SDavid Howells d_add(dentry, NULL); 889260a9803SDavid Howells _leave(" = NULL [negative]"); 890260a9803SDavid Howells return NULL; 891260a9803SDavid Howells } 892260a9803SDavid Howells _leave(" = %d [do]", ret); 893260a9803SDavid Howells return ERR_PTR(ret); 894260a9803SDavid Howells } 8955cf9dd55SDavid Howells dentry->d_fsdata = (void *)(unsigned long)dvnode->status.data_version; 896260a9803SDavid Howells 8971da177e4SLinus Torvalds /* instantiate the dentry */ 89800d3b7a4SDavid Howells key_put(key); 89908e0e7c8SDavid Howells if (IS_ERR(inode)) { 90008e0e7c8SDavid Howells _leave(" = %ld", PTR_ERR(inode)); 901e231c2eeSDavid Howells return ERR_CAST(inode); 9021da177e4SLinus Torvalds } 9031da177e4SLinus Torvalds 904bec5eb61Swanglei success: 9051da177e4SLinus Torvalds d_add(dentry, inode); 9065cf9dd55SDavid Howells _leave(" = 0 { ino=%lu v=%u }", 9072b0143b5SDavid Howells d_inode(dentry)->i_ino, 9082b0143b5SDavid Howells d_inode(dentry)->i_generation); 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds return NULL; 911ec26815aSDavid Howells } 9121da177e4SLinus Torvalds 9131da177e4SLinus Torvalds /* 91437ab6368SDavid Howells * Look up @cell in a dynroot directory. This is a substitution for the 91537ab6368SDavid Howells * local cell name for the net namespace. 91637ab6368SDavid Howells */ 91737ab6368SDavid Howells static struct dentry *afs_lookup_atcell(struct dentry *dentry) 91837ab6368SDavid Howells { 91937ab6368SDavid Howells struct afs_cell *cell; 92037ab6368SDavid Howells struct afs_net *net = afs_d2net(dentry); 92137ab6368SDavid Howells struct dentry *ret; 92237ab6368SDavid Howells unsigned int seq = 0; 92337ab6368SDavid Howells char *name; 92437ab6368SDavid Howells int len; 92537ab6368SDavid Howells 92637ab6368SDavid Howells if (!net->ws_cell) 92737ab6368SDavid Howells return ERR_PTR(-ENOENT); 92837ab6368SDavid Howells 92937ab6368SDavid Howells ret = ERR_PTR(-ENOMEM); 93037ab6368SDavid Howells name = kmalloc(AFS_MAXCELLNAME + 1, GFP_KERNEL); 93137ab6368SDavid Howells if (!name) 93237ab6368SDavid Howells goto out_p; 93337ab6368SDavid Howells 93437ab6368SDavid Howells rcu_read_lock(); 93537ab6368SDavid Howells do { 93637ab6368SDavid Howells read_seqbegin_or_lock(&net->cells_lock, &seq); 93737ab6368SDavid Howells cell = rcu_dereference_raw(net->ws_cell); 93837ab6368SDavid Howells if (cell) { 93937ab6368SDavid Howells len = cell->name_len; 94037ab6368SDavid Howells memcpy(name, cell->name, len + 1); 94137ab6368SDavid Howells } 94237ab6368SDavid Howells } while (need_seqretry(&net->cells_lock, seq)); 94337ab6368SDavid Howells done_seqretry(&net->cells_lock, seq); 94437ab6368SDavid Howells rcu_read_unlock(); 94537ab6368SDavid Howells 94637ab6368SDavid Howells ret = ERR_PTR(-ENOENT); 94737ab6368SDavid Howells if (!cell) 94837ab6368SDavid Howells goto out_n; 94937ab6368SDavid Howells 95037ab6368SDavid Howells ret = lookup_one_len(name, dentry->d_parent, len); 95137ab6368SDavid Howells 95237ab6368SDavid Howells /* We don't want to d_add() the @cell dentry here as we don't want to 95337ab6368SDavid Howells * the cached dentry to hide changes to the local cell name. 95437ab6368SDavid Howells */ 95537ab6368SDavid Howells 95637ab6368SDavid Howells out_n: 95737ab6368SDavid Howells kfree(name); 95837ab6368SDavid Howells out_p: 95937ab6368SDavid Howells return ret; 96037ab6368SDavid Howells } 96137ab6368SDavid Howells 96237ab6368SDavid Howells /* 9634d673da1SDavid Howells * Look up an entry in a dynroot directory. 9644d673da1SDavid Howells */ 9654d673da1SDavid Howells static struct dentry *afs_dynroot_lookup(struct inode *dir, struct dentry *dentry, 9664d673da1SDavid Howells unsigned int flags) 9674d673da1SDavid Howells { 9684d673da1SDavid Howells struct afs_vnode *vnode; 9694d673da1SDavid Howells struct inode *inode; 9704d673da1SDavid Howells int ret; 9714d673da1SDavid Howells 9724d673da1SDavid Howells vnode = AFS_FS_I(dir); 9734d673da1SDavid Howells 9744d673da1SDavid Howells _enter("%pd", dentry); 9754d673da1SDavid Howells 9764d673da1SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 9774d673da1SDavid Howells 9784d673da1SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 9794d673da1SDavid Howells _leave(" = -ENAMETOOLONG"); 9804d673da1SDavid Howells return ERR_PTR(-ENAMETOOLONG); 9814d673da1SDavid Howells } 9824d673da1SDavid Howells 98337ab6368SDavid Howells if (dentry->d_name.len == 5 && 98437ab6368SDavid Howells memcmp(dentry->d_name.name, "@cell", 5) == 0) 98537ab6368SDavid Howells return afs_lookup_atcell(dentry); 98637ab6368SDavid Howells 9875cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 9884d673da1SDavid Howells if (IS_ERR(inode)) { 9894d673da1SDavid Howells ret = PTR_ERR(inode); 9904d673da1SDavid Howells if (ret == -ENOENT) { 9914d673da1SDavid Howells d_add(dentry, NULL); 9924d673da1SDavid Howells _leave(" = NULL [negative]"); 9934d673da1SDavid Howells return NULL; 9944d673da1SDavid Howells } 9954d673da1SDavid Howells _leave(" = %d [do]", ret); 9964d673da1SDavid Howells return ERR_PTR(ret); 9974d673da1SDavid Howells } 9984d673da1SDavid Howells 9994d673da1SDavid Howells d_add(dentry, inode); 10004d673da1SDavid Howells _leave(" = 0 { ino=%lu v=%u }", 10014d673da1SDavid Howells d_inode(dentry)->i_ino, d_inode(dentry)->i_generation); 10024d673da1SDavid Howells return NULL; 10034d673da1SDavid Howells } 10044d673da1SDavid Howells 10054d673da1SDavid Howells /* 10061da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 10071da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 10081da177e4SLinus Torvalds * inode 10091da177e4SLinus Torvalds */ 10100b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 10111da177e4SLinus Torvalds { 10124d673da1SDavid Howells struct afs_super_info *as = dentry->d_sb->s_fs_info; 1013260a9803SDavid Howells struct afs_vnode *vnode, *dir; 1014dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 10151da177e4SLinus Torvalds struct dentry *parent; 1016c435ee34SDavid Howells struct inode *inode; 101700d3b7a4SDavid Howells struct key *key; 1018a4ff7401SDavid Howells long dir_version, de_version; 10191da177e4SLinus Torvalds int ret; 10201da177e4SLinus Torvalds 10210b728e19SAl Viro if (flags & LOOKUP_RCU) 102234286d66SNick Piggin return -ECHILD; 102334286d66SNick Piggin 10244d673da1SDavid Howells if (as->dyn_root) 10254d673da1SDavid Howells return 1; 10264d673da1SDavid Howells 1027c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 10282b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1029a455589fSAl Viro _enter("{v={%x:%u} n=%pd fl=%lx},", 1030a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 1031260a9803SDavid Howells vnode->flags); 1032c435ee34SDavid Howells } else { 1033a455589fSAl Viro _enter("{neg n=%pd}", dentry); 1034c435ee34SDavid Howells } 10351da177e4SLinus Torvalds 1036260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 103700d3b7a4SDavid Howells if (IS_ERR(key)) 103800d3b7a4SDavid Howells key = NULL; 103900d3b7a4SDavid Howells 1040c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 1041c435ee34SDavid Howells inode = d_inode(dentry); 1042c435ee34SDavid Howells if (inode) { 1043c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1044c435ee34SDavid Howells afs_validate(vnode, key); 1045c435ee34SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1046c435ee34SDavid Howells goto out_bad; 1047c435ee34SDavid Howells } 1048c435ee34SDavid Howells } 1049c435ee34SDavid Howells 10501da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 105108e0e7c8SDavid Howells parent = dget_parent(dentry); 10522b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 10531da177e4SLinus Torvalds 1054260a9803SDavid Howells /* validate the parent directory */ 1055260a9803SDavid Howells afs_validate(dir, key); 1056260a9803SDavid Howells 1057260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 1058a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 1059c435ee34SDavid Howells goto out_bad_parent; 10601da177e4SLinus Torvalds } 10611da177e4SLinus Torvalds 1062a4ff7401SDavid Howells /* We only need to invalidate a dentry if the server's copy changed 1063a4ff7401SDavid Howells * behind our back. If we made the change, it's no problem. Note that 1064a4ff7401SDavid Howells * on a 32-bit system, we only have 32 bits in the dentry to store the 1065a4ff7401SDavid Howells * version. 1066a4ff7401SDavid Howells */ 1067a4ff7401SDavid Howells dir_version = (long)dir->status.data_version; 1068a4ff7401SDavid Howells de_version = (long)dentry->d_fsdata; 1069a4ff7401SDavid Howells if (de_version == dir_version) 1070a4ff7401SDavid Howells goto out_valid; 1071a4ff7401SDavid Howells 1072a4ff7401SDavid Howells dir_version = (long)dir->invalid_before; 1073a4ff7401SDavid Howells if (de_version - dir_version >= 0) 1074a4ff7401SDavid Howells goto out_valid; 1075260a9803SDavid Howells 107608e0e7c8SDavid Howells _debug("dir modified"); 1077d55b4da4SDavid Howells afs_stat_v(dir, n_reval); 10781da177e4SLinus Torvalds 10791da177e4SLinus Torvalds /* search the directory for this vnode */ 10805cf9dd55SDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); 1081260a9803SDavid Howells switch (ret) { 1082260a9803SDavid Howells case 0: 1083260a9803SDavid Howells /* the filename maps to something */ 10842b0143b5SDavid Howells if (d_really_is_negative(dentry)) 1085c435ee34SDavid Howells goto out_bad_parent; 1086c435ee34SDavid Howells inode = d_inode(dentry); 1087c435ee34SDavid Howells if (is_bad_inode(inode)) { 1088a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 1089a455589fSAl Viro dentry); 1090c435ee34SDavid Howells goto out_bad_parent; 10911da177e4SLinus Torvalds } 10921da177e4SLinus Torvalds 1093c435ee34SDavid Howells vnode = AFS_FS_I(inode); 1094c435ee34SDavid Howells 10951da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 10961da177e4SLinus Torvalds * different file */ 109708e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 1098a455589fSAl Viro _debug("%pd: dirent changed [%u != %u]", 1099a455589fSAl Viro dentry, fid.vnode, 110008e0e7c8SDavid Howells vnode->fid.vnode); 11011da177e4SLinus Torvalds goto not_found; 11021da177e4SLinus Torvalds } 11031da177e4SLinus Torvalds 11041da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 1105260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 1106260a9803SDavid Howells * been reused */ 110708e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 1108a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 1109a455589fSAl Viro dentry, fid.unique, 11107a224228SJean Noel Cordenner vnode->fid.unique, 1111c435ee34SDavid Howells vnode->vfs_inode.i_generation); 1112c435ee34SDavid Howells write_seqlock(&vnode->cb_lock); 111308e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1114c435ee34SDavid Howells write_sequnlock(&vnode->cb_lock); 1115260a9803SDavid Howells goto not_found; 1116260a9803SDavid Howells } 1117260a9803SDavid Howells goto out_valid; 1118260a9803SDavid Howells 1119260a9803SDavid Howells case -ENOENT: 1120260a9803SDavid Howells /* the filename is unknown */ 1121a455589fSAl Viro _debug("%pd: dirent not found", dentry); 11222b0143b5SDavid Howells if (d_really_is_positive(dentry)) 1123260a9803SDavid Howells goto not_found; 1124260a9803SDavid Howells goto out_valid; 1125260a9803SDavid Howells 1126260a9803SDavid Howells default: 1127a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 1128a455589fSAl Viro parent, ret); 1129c435ee34SDavid Howells goto out_bad_parent; 11301da177e4SLinus Torvalds } 113108e0e7c8SDavid Howells 11321da177e4SLinus Torvalds out_valid: 1133a4ff7401SDavid Howells dentry->d_fsdata = (void *)dir_version; 11341da177e4SLinus Torvalds dput(parent); 113500d3b7a4SDavid Howells key_put(key); 11361da177e4SLinus Torvalds _leave(" = 1 [valid]"); 11371da177e4SLinus Torvalds return 1; 11381da177e4SLinus Torvalds 11391da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 11401da177e4SLinus Torvalds not_found: 11411da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 11421da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 11431da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 11441da177e4SLinus Torvalds 1145c435ee34SDavid Howells out_bad_parent: 1146a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 11471da177e4SLinus Torvalds dput(parent); 1148c435ee34SDavid Howells out_bad: 114900d3b7a4SDavid Howells key_put(key); 11501da177e4SLinus Torvalds 11511da177e4SLinus Torvalds _leave(" = 0 [bad]"); 11521da177e4SLinus Torvalds return 0; 1153ec26815aSDavid Howells } 11541da177e4SLinus Torvalds 11551da177e4SLinus Torvalds /* 11561da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 11571da177e4SLinus Torvalds * sleep) 11581da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 11591da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 11601da177e4SLinus Torvalds */ 1161fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 11621da177e4SLinus Torvalds { 1163a455589fSAl Viro _enter("%pd", dentry); 11641da177e4SLinus Torvalds 11651da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 11661da177e4SLinus Torvalds goto zap; 11671da177e4SLinus Torvalds 11682b0143b5SDavid Howells if (d_really_is_positive(dentry) && 11692b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 11702b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 11711da177e4SLinus Torvalds goto zap; 11721da177e4SLinus Torvalds 11731da177e4SLinus Torvalds _leave(" = 0 [keep]"); 11741da177e4SLinus Torvalds return 0; 11751da177e4SLinus Torvalds 11761da177e4SLinus Torvalds zap: 11771da177e4SLinus Torvalds _leave(" = 1 [zap]"); 11781da177e4SLinus Torvalds return 1; 1179ec26815aSDavid Howells } 1180260a9803SDavid Howells 1181260a9803SDavid Howells /* 1182260a9803SDavid Howells * handle dentry release 1183260a9803SDavid Howells */ 1184260a9803SDavid Howells static void afs_d_release(struct dentry *dentry) 1185260a9803SDavid Howells { 1186a455589fSAl Viro _enter("%pd", dentry); 1187260a9803SDavid Howells } 1188260a9803SDavid Howells 1189260a9803SDavid Howells /* 1190d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1191d2ddc776SDavid Howells */ 1192d2ddc776SDavid Howells static void afs_vnode_new_inode(struct afs_fs_cursor *fc, 1193d2ddc776SDavid Howells struct dentry *new_dentry, 1194d2ddc776SDavid Howells struct afs_fid *newfid, 1195d2ddc776SDavid Howells struct afs_file_status *newstatus, 1196d2ddc776SDavid Howells struct afs_callback *newcb) 1197d2ddc776SDavid Howells { 1198d2ddc776SDavid Howells struct inode *inode; 1199d2ddc776SDavid Howells 1200d2ddc776SDavid Howells if (fc->ac.error < 0) 1201d2ddc776SDavid Howells return; 1202d2ddc776SDavid Howells 1203bc1527dcSDavid Howells d_drop(new_dentry); 1204bc1527dcSDavid Howells 1205d2ddc776SDavid Howells inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, 1206d2ddc776SDavid Howells newfid, newstatus, newcb, fc->cbi); 1207d2ddc776SDavid Howells if (IS_ERR(inode)) { 1208d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1209d2ddc776SDavid Howells * the new directory on the server. 1210d2ddc776SDavid Howells */ 1211d2ddc776SDavid Howells fc->ac.error = PTR_ERR(inode); 1212d2ddc776SDavid Howells return; 1213d2ddc776SDavid Howells } 1214d2ddc776SDavid Howells 1215bc1527dcSDavid Howells d_add(new_dentry, inode); 1216d2ddc776SDavid Howells } 1217d2ddc776SDavid Howells 1218d2ddc776SDavid Howells /* 1219260a9803SDavid Howells * create a directory on an AFS filesystem 1220260a9803SDavid Howells */ 122118bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1222260a9803SDavid Howells { 1223d2ddc776SDavid Howells struct afs_file_status newstatus; 1224d2ddc776SDavid Howells struct afs_fs_cursor fc; 1225d2ddc776SDavid Howells struct afs_callback newcb; 1226d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1227d2ddc776SDavid Howells struct afs_fid newfid; 1228260a9803SDavid Howells struct key *key; 1229260a9803SDavid Howells int ret; 1230260a9803SDavid Howells 1231d2ddc776SDavid Howells mode |= S_IFDIR; 1232260a9803SDavid Howells 1233a455589fSAl Viro _enter("{%x:%u},{%pd},%ho", 1234a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1235260a9803SDavid Howells 1236260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1237260a9803SDavid Howells if (IS_ERR(key)) { 1238260a9803SDavid Howells ret = PTR_ERR(key); 1239260a9803SDavid Howells goto error; 1240260a9803SDavid Howells } 1241260a9803SDavid Howells 1242d2ddc776SDavid Howells ret = -ERESTARTSYS; 1243d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1244d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1245d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1246d2ddc776SDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, 1247d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1248d2ddc776SDavid Howells } 1249d2ddc776SDavid Howells 1250d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1251d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1252d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1253d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1254260a9803SDavid Howells if (ret < 0) 1255d2ddc776SDavid Howells goto error_key; 12564433b691SDavid Howells } else { 12574433b691SDavid Howells goto error_key; 1258260a9803SDavid Howells } 1259260a9803SDavid Howells 1260260a9803SDavid Howells key_put(key); 1261260a9803SDavid Howells _leave(" = 0"); 1262260a9803SDavid Howells return 0; 1263260a9803SDavid Howells 1264d2ddc776SDavid Howells error_key: 1265260a9803SDavid Howells key_put(key); 1266260a9803SDavid Howells error: 1267260a9803SDavid Howells d_drop(dentry); 1268260a9803SDavid Howells _leave(" = %d", ret); 1269260a9803SDavid Howells return ret; 1270260a9803SDavid Howells } 1271260a9803SDavid Howells 1272260a9803SDavid Howells /* 1273d2ddc776SDavid Howells * Remove a subdir from a directory. 1274260a9803SDavid Howells */ 1275d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1276260a9803SDavid Howells { 12772b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1278d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1279d2ddc776SDavid Howells 1280260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1281260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1282c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1283260a9803SDavid Howells } 1284260a9803SDavid Howells } 1285260a9803SDavid Howells 1286260a9803SDavid Howells /* 1287d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1288260a9803SDavid Howells */ 1289d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1290260a9803SDavid Howells { 1291d2ddc776SDavid Howells struct afs_fs_cursor fc; 1292d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1293260a9803SDavid Howells struct key *key; 1294260a9803SDavid Howells int ret; 1295260a9803SDavid Howells 1296a455589fSAl Viro _enter("{%x:%u},{%pd}", 1297a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1298260a9803SDavid Howells 1299260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1300260a9803SDavid Howells if (IS_ERR(key)) { 1301260a9803SDavid Howells ret = PTR_ERR(key); 1302260a9803SDavid Howells goto error; 1303260a9803SDavid Howells } 1304260a9803SDavid Howells 1305d2ddc776SDavid Howells ret = -ERESTARTSYS; 1306d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1307d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1308d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1309d2ddc776SDavid Howells afs_fs_remove(&fc, dentry->d_name.name, true); 1310260a9803SDavid Howells } 1311260a9803SDavid Howells 1312d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1313d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1314d2ddc776SDavid Howells if (ret == 0) 1315d2ddc776SDavid Howells afs_dir_remove_subdir(dentry); 1316260a9803SDavid Howells } 1317260a9803SDavid Howells 1318260a9803SDavid Howells key_put(key); 1319d2ddc776SDavid Howells error: 1320d2ddc776SDavid Howells return ret; 1321d2ddc776SDavid Howells } 1322260a9803SDavid Howells 1323d2ddc776SDavid Howells /* 1324d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1325d2ddc776SDavid Howells * 1326d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1327d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1328d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1329d2ddc776SDavid Howells * 1330d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1331d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1332d2ddc776SDavid Howells */ 1333440fbc3aSDavid Howells static int afs_dir_remove_link(struct dentry *dentry, struct key *key, 1334440fbc3aSDavid Howells unsigned long d_version_before, 1335440fbc3aSDavid Howells unsigned long d_version_after) 1336d2ddc776SDavid Howells { 1337440fbc3aSDavid Howells bool dir_valid; 1338d2ddc776SDavid Howells int ret = 0; 1339d2ddc776SDavid Howells 1340440fbc3aSDavid Howells /* There were no intervening changes on the server if the version 1341440fbc3aSDavid Howells * number we got back was incremented by exactly 1. 1342440fbc3aSDavid Howells */ 1343440fbc3aSDavid Howells dir_valid = (d_version_after == d_version_before + 1); 1344440fbc3aSDavid Howells 1345d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1346d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1347d2ddc776SDavid Howells 1348440fbc3aSDavid Howells if (dir_valid) { 1349440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1350440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1351440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1352440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1353440fbc3aSDavid Howells } 1354440fbc3aSDavid Howells ret = 0; 1355440fbc3aSDavid Howells } else { 1356440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1357440fbc3aSDavid Howells 1358d2ddc776SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1359d2ddc776SDavid Howells kdebug("AFS_VNODE_DELETED"); 1360d2ddc776SDavid Howells 1361d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1362d2ddc776SDavid Howells if (ret == -ESTALE) 1363d2ddc776SDavid Howells ret = 0; 1364440fbc3aSDavid Howells } 1365d2ddc776SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 1366d2ddc776SDavid Howells } 1367d2ddc776SDavid Howells 1368d2ddc776SDavid Howells return ret; 1369d2ddc776SDavid Howells } 1370d2ddc776SDavid Howells 1371d2ddc776SDavid Howells /* 1372d2ddc776SDavid Howells * Remove a file or symlink from an AFS filesystem. 1373d2ddc776SDavid Howells */ 1374d2ddc776SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 1375d2ddc776SDavid Howells { 1376d2ddc776SDavid Howells struct afs_fs_cursor fc; 1377d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; 1378d2ddc776SDavid Howells struct key *key; 1379440fbc3aSDavid Howells unsigned long d_version = (unsigned long)dentry->d_fsdata; 1380d2ddc776SDavid Howells int ret; 1381d2ddc776SDavid Howells 1382d2ddc776SDavid Howells _enter("{%x:%u},{%pd}", 1383d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1384d2ddc776SDavid Howells 1385d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1386d2ddc776SDavid Howells return -ENAMETOOLONG; 1387d2ddc776SDavid Howells 1388d2ddc776SDavid Howells key = afs_request_key(dvnode->volume->cell); 1389d2ddc776SDavid Howells if (IS_ERR(key)) { 1390d2ddc776SDavid Howells ret = PTR_ERR(key); 1391d2ddc776SDavid Howells goto error; 1392d2ddc776SDavid Howells } 1393d2ddc776SDavid Howells 1394d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1395d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1396d2ddc776SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1397d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1398d2ddc776SDavid Howells if (ret < 0) 1399d2ddc776SDavid Howells goto error_key; 1400d2ddc776SDavid Howells } 1401d2ddc776SDavid Howells 1402d2ddc776SDavid Howells ret = -ERESTARTSYS; 1403d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1404d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1405d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1406d2ddc776SDavid Howells afs_fs_remove(&fc, dentry->d_name.name, false); 1407d2ddc776SDavid Howells } 1408d2ddc776SDavid Howells 1409d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1410d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1411d2ddc776SDavid Howells if (ret == 0) 1412440fbc3aSDavid Howells ret = afs_dir_remove_link( 1413440fbc3aSDavid Howells dentry, key, d_version, 1414440fbc3aSDavid Howells (unsigned long)dvnode->status.data_version); 1415d2ddc776SDavid Howells } 1416d2ddc776SDavid Howells 1417d2ddc776SDavid Howells error_key: 1418260a9803SDavid Howells key_put(key); 1419260a9803SDavid Howells error: 1420260a9803SDavid Howells _leave(" = %d", ret); 1421260a9803SDavid Howells return ret; 1422260a9803SDavid Howells } 1423260a9803SDavid Howells 1424260a9803SDavid Howells /* 1425260a9803SDavid Howells * create a regular file on an AFS filesystem 1426260a9803SDavid Howells */ 14274acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 1428ebfc3b49SAl Viro bool excl) 1429260a9803SDavid Howells { 1430d2ddc776SDavid Howells struct afs_fs_cursor fc; 1431d2ddc776SDavid Howells struct afs_file_status newstatus; 1432d2ddc776SDavid Howells struct afs_callback newcb; 143343dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1434d2ddc776SDavid Howells struct afs_fid newfid; 1435260a9803SDavid Howells struct key *key; 1436260a9803SDavid Howells int ret; 1437260a9803SDavid Howells 1438d2ddc776SDavid Howells mode |= S_IFREG; 1439260a9803SDavid Howells 1440a455589fSAl Viro _enter("{%x:%u},{%pd},%ho,", 1441a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1442260a9803SDavid Howells 1443d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1444d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1445d2ddc776SDavid Howells goto error; 1446d2ddc776SDavid Howells 1447260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1448260a9803SDavid Howells if (IS_ERR(key)) { 1449260a9803SDavid Howells ret = PTR_ERR(key); 1450260a9803SDavid Howells goto error; 1451260a9803SDavid Howells } 1452260a9803SDavid Howells 1453d2ddc776SDavid Howells ret = -ERESTARTSYS; 1454d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1455d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1456d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1457d2ddc776SDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, 1458d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1459d2ddc776SDavid Howells } 1460d2ddc776SDavid Howells 1461d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1462d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1463d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1464d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1465260a9803SDavid Howells if (ret < 0) 1466d2ddc776SDavid Howells goto error_key; 14674433b691SDavid Howells } else { 14684433b691SDavid Howells goto error_key; 1469260a9803SDavid Howells } 1470260a9803SDavid Howells 1471260a9803SDavid Howells key_put(key); 1472260a9803SDavid Howells _leave(" = 0"); 1473260a9803SDavid Howells return 0; 1474260a9803SDavid Howells 1475d2ddc776SDavid Howells error_key: 1476260a9803SDavid Howells key_put(key); 1477260a9803SDavid Howells error: 1478260a9803SDavid Howells d_drop(dentry); 1479260a9803SDavid Howells _leave(" = %d", ret); 1480260a9803SDavid Howells return ret; 1481260a9803SDavid Howells } 1482260a9803SDavid Howells 1483260a9803SDavid Howells /* 1484260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1485260a9803SDavid Howells */ 1486260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1487260a9803SDavid Howells struct dentry *dentry) 1488260a9803SDavid Howells { 1489d2ddc776SDavid Howells struct afs_fs_cursor fc; 1490260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1491260a9803SDavid Howells struct key *key; 1492260a9803SDavid Howells int ret; 1493260a9803SDavid Howells 14942b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(from)); 1495260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1496260a9803SDavid Howells 1497a455589fSAl Viro _enter("{%x:%u},{%x:%u},{%pd}", 1498260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1499260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1500a455589fSAl Viro dentry); 1501260a9803SDavid Howells 1502d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1503d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1504d2ddc776SDavid Howells goto error; 1505d2ddc776SDavid Howells 1506260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1507260a9803SDavid Howells if (IS_ERR(key)) { 1508260a9803SDavid Howells ret = PTR_ERR(key); 1509260a9803SDavid Howells goto error; 1510260a9803SDavid Howells } 1511260a9803SDavid Howells 1512d2ddc776SDavid Howells ret = -ERESTARTSYS; 1513d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1514d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { 1515d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1516bc1527dcSDavid Howells goto error_key; 1517d2ddc776SDavid Howells } 1518260a9803SDavid Howells 1519d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1520d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1521d2ddc776SDavid Howells fc.cb_break_2 = vnode->cb_break + vnode->cb_s_break; 1522d2ddc776SDavid Howells afs_fs_link(&fc, vnode, dentry->d_name.name); 1523d2ddc776SDavid Howells } 1524d2ddc776SDavid Howells 1525d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1526d2ddc776SDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); 15277de9c6eeSAl Viro ihold(&vnode->vfs_inode); 1528260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1529d2ddc776SDavid Howells 1530d2ddc776SDavid Howells mutex_unlock(&vnode->io_lock); 1531d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1532d2ddc776SDavid Howells if (ret < 0) 1533d2ddc776SDavid Howells goto error_key; 15344433b691SDavid Howells } else { 15354433b691SDavid Howells goto error_key; 1536d2ddc776SDavid Howells } 1537d2ddc776SDavid Howells 1538260a9803SDavid Howells key_put(key); 1539260a9803SDavid Howells _leave(" = 0"); 1540260a9803SDavid Howells return 0; 1541260a9803SDavid Howells 1542d2ddc776SDavid Howells error_key: 1543260a9803SDavid Howells key_put(key); 1544260a9803SDavid Howells error: 1545260a9803SDavid Howells d_drop(dentry); 1546260a9803SDavid Howells _leave(" = %d", ret); 1547260a9803SDavid Howells return ret; 1548260a9803SDavid Howells } 1549260a9803SDavid Howells 1550260a9803SDavid Howells /* 1551260a9803SDavid Howells * create a symlink in an AFS filesystem 1552260a9803SDavid Howells */ 1553260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1554260a9803SDavid Howells const char *content) 1555260a9803SDavid Howells { 1556d2ddc776SDavid Howells struct afs_fs_cursor fc; 1557d2ddc776SDavid Howells struct afs_file_status newstatus; 1558d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1559d2ddc776SDavid Howells struct afs_fid newfid; 1560260a9803SDavid Howells struct key *key; 1561260a9803SDavid Howells int ret; 1562260a9803SDavid Howells 1563a455589fSAl Viro _enter("{%x:%u},{%pd},%s", 1564a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1565260a9803SDavid Howells content); 1566260a9803SDavid Howells 1567d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1568d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1569d2ddc776SDavid Howells goto error; 1570d2ddc776SDavid Howells 1571260a9803SDavid Howells ret = -EINVAL; 157245222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1573260a9803SDavid Howells goto error; 1574260a9803SDavid Howells 1575260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1576260a9803SDavid Howells if (IS_ERR(key)) { 1577260a9803SDavid Howells ret = PTR_ERR(key); 1578260a9803SDavid Howells goto error; 1579260a9803SDavid Howells } 1580260a9803SDavid Howells 1581d2ddc776SDavid Howells ret = -ERESTARTSYS; 1582d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1583d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1584d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1585d2ddc776SDavid Howells afs_fs_symlink(&fc, dentry->d_name.name, content, 1586d2ddc776SDavid Howells &newfid, &newstatus); 1587d2ddc776SDavid Howells } 1588d2ddc776SDavid Howells 1589d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1590d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1591d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); 1592d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1593260a9803SDavid Howells if (ret < 0) 1594d2ddc776SDavid Howells goto error_key; 15954433b691SDavid Howells } else { 15964433b691SDavid Howells goto error_key; 1597260a9803SDavid Howells } 1598260a9803SDavid Howells 1599260a9803SDavid Howells key_put(key); 1600260a9803SDavid Howells _leave(" = 0"); 1601260a9803SDavid Howells return 0; 1602260a9803SDavid Howells 1603d2ddc776SDavid Howells error_key: 1604260a9803SDavid Howells key_put(key); 1605260a9803SDavid Howells error: 1606260a9803SDavid Howells d_drop(dentry); 1607260a9803SDavid Howells _leave(" = %d", ret); 1608260a9803SDavid Howells return ret; 1609260a9803SDavid Howells } 1610260a9803SDavid Howells 1611260a9803SDavid Howells /* 1612260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1613260a9803SDavid Howells */ 1614260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 16151cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 16161cd66c93SMiklos Szeredi unsigned int flags) 1617260a9803SDavid Howells { 1618d2ddc776SDavid Howells struct afs_fs_cursor fc; 1619260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1620260a9803SDavid Howells struct key *key; 1621260a9803SDavid Howells int ret; 1622260a9803SDavid Howells 16231cd66c93SMiklos Szeredi if (flags) 16241cd66c93SMiklos Szeredi return -EINVAL; 16251cd66c93SMiklos Szeredi 16262b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1627260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1628260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1629260a9803SDavid Howells 1630a455589fSAl Viro _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", 1631260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1632260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1633260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1634a455589fSAl Viro new_dentry); 1635260a9803SDavid Howells 1636260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1637260a9803SDavid Howells if (IS_ERR(key)) { 1638260a9803SDavid Howells ret = PTR_ERR(key); 1639260a9803SDavid Howells goto error; 1640260a9803SDavid Howells } 1641260a9803SDavid Howells 1642d2ddc776SDavid Howells ret = -ERESTARTSYS; 1643d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { 1644d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) { 1645d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { 1646d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1647bc1527dcSDavid Howells goto error_key; 1648d2ddc776SDavid Howells } 1649d2ddc776SDavid Howells } 1650d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1651d2ddc776SDavid Howells fc.cb_break = orig_dvnode->cb_break + orig_dvnode->cb_s_break; 1652d2ddc776SDavid Howells fc.cb_break_2 = new_dvnode->cb_break + new_dvnode->cb_s_break; 1653d2ddc776SDavid Howells afs_fs_rename(&fc, old_dentry->d_name.name, 1654d2ddc776SDavid Howells new_dvnode, new_dentry->d_name.name); 1655d2ddc776SDavid Howells } 1656d2ddc776SDavid Howells 1657d2ddc776SDavid Howells afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); 1658d2ddc776SDavid Howells afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); 1659d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) 1660d2ddc776SDavid Howells mutex_unlock(&new_dvnode->io_lock); 1661d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1662260a9803SDavid Howells if (ret < 0) 1663d2ddc776SDavid Howells goto error_key; 1664d2ddc776SDavid Howells } 1665d2ddc776SDavid Howells 1666d2ddc776SDavid Howells error_key: 1667260a9803SDavid Howells key_put(key); 1668260a9803SDavid Howells error: 1669260a9803SDavid Howells _leave(" = %d", ret); 1670260a9803SDavid Howells return ret; 1671260a9803SDavid Howells } 1672