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: 2091da177e4SLinus Torvalds SetPageChecked(page); 210be5b82dbSAl Viro return true; 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds error: 2131da177e4SLinus Torvalds SetPageError(page); 214be5b82dbSAl Viro return false; 215ec26815aSDavid Howells } 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvalds /* 2181da177e4SLinus Torvalds * discard a page cached in the pagecache 2191da177e4SLinus Torvalds */ 2201da177e4SLinus Torvalds static inline void afs_dir_put_page(struct page *page) 2211da177e4SLinus Torvalds { 2221da177e4SLinus Torvalds kunmap(page); 223dab17c1aSDavid Howells unlock_page(page); 22409cbfeafSKirill A. Shutemov put_page(page); 225ec26815aSDavid Howells } 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds /* 2281da177e4SLinus Torvalds * get a page into the pagecache 2291da177e4SLinus Torvalds */ 23000d3b7a4SDavid Howells static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, 23100d3b7a4SDavid Howells struct key *key) 2321da177e4SLinus Torvalds { 2331da177e4SLinus Torvalds struct page *page; 2341da177e4SLinus Torvalds _enter("{%lu},%lu", dir->i_ino, index); 2351da177e4SLinus Torvalds 236f6d335c0SAl Viro page = read_cache_page(dir->i_mapping, index, afs_page_filler, key); 2371da177e4SLinus Torvalds if (!IS_ERR(page)) { 238dab17c1aSDavid Howells lock_page(page); 2391da177e4SLinus Torvalds kmap(page); 240be5b82dbSAl Viro if (unlikely(!PageChecked(page))) { 241dab17c1aSDavid Howells if (PageError(page)) 2421da177e4SLinus Torvalds goto fail; 2431da177e4SLinus Torvalds } 244be5b82dbSAl Viro } 2451da177e4SLinus Torvalds return page; 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds fail: 2481da177e4SLinus Torvalds afs_dir_put_page(page); 24908e0e7c8SDavid Howells _leave(" = -EIO"); 2501da177e4SLinus Torvalds return ERR_PTR(-EIO); 251ec26815aSDavid Howells } 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds /* 2541da177e4SLinus Torvalds * open an AFS directory file 2551da177e4SLinus Torvalds */ 2561da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 2571da177e4SLinus Torvalds { 2581da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 2591da177e4SLinus Torvalds 2602ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 2612ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 2621da177e4SLinus Torvalds 26308e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2641da177e4SLinus Torvalds return -ENOENT; 2651da177e4SLinus Torvalds 26600d3b7a4SDavid Howells return afs_open(inode, file); 267ec26815aSDavid Howells } 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds /* 2701da177e4SLinus Torvalds * deal with one block in an AFS directory 2711da177e4SLinus Torvalds */ 2721bbae9f8SAl Viro static int afs_dir_iterate_block(struct dir_context *ctx, 2731da177e4SLinus Torvalds union afs_dir_block *block, 2741bbae9f8SAl Viro unsigned blkoff) 2751da177e4SLinus Torvalds { 2761da177e4SLinus Torvalds union afs_dirent *dire; 2771da177e4SLinus Torvalds unsigned offset, next, curr; 2781da177e4SLinus Torvalds size_t nlen; 2791bbae9f8SAl Viro int tmp; 2801da177e4SLinus Torvalds 2811bbae9f8SAl Viro _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 2821da177e4SLinus Torvalds 2831bbae9f8SAl Viro curr = (ctx->pos - blkoff) / sizeof(union afs_dirent); 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 2861da177e4SLinus Torvalds for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; 2871da177e4SLinus Torvalds offset < AFS_DIRENT_PER_BLOCK; 2881da177e4SLinus Torvalds offset = next 2891da177e4SLinus Torvalds ) { 2901da177e4SLinus Torvalds next = offset + 1; 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 2931da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[offset / 8] & 2941da177e4SLinus Torvalds (1 << (offset % 8)))) { 2955b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: unused", 2961da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset); 2971da177e4SLinus Torvalds if (offset >= curr) 2981bbae9f8SAl Viro ctx->pos = blkoff + 2991da177e4SLinus Torvalds next * sizeof(union afs_dirent); 3001da177e4SLinus Torvalds continue; 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds /* got a valid entry */ 3041da177e4SLinus Torvalds dire = &block->dirents[offset]; 3051da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 3061da177e4SLinus Torvalds sizeof(*block) - 3071da177e4SLinus Torvalds offset * sizeof(union afs_dirent)); 3081da177e4SLinus Torvalds 3095b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: %s %zu \"%s\"", 3101da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset, 3111da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 3121da177e4SLinus Torvalds nlen, dire->u.name); 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds /* work out where the next possible entry is */ 3151da177e4SLinus Torvalds for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { 3161da177e4SLinus Torvalds if (next >= AFS_DIRENT_PER_BLOCK) { 3175b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 3181da177e4SLinus Torvalds " %u travelled beyond end dir block" 3195b5e0928SAlexey Dobriyan " (len %u/%zu)", 3201da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 3211da177e4SLinus Torvalds offset, next, tmp, nlen); 3221da177e4SLinus Torvalds return -EIO; 3231da177e4SLinus Torvalds } 3241da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[next / 8] & 3251da177e4SLinus Torvalds (1 << (next % 8)))) { 3265b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 3275b5e0928SAlexey Dobriyan " %u unmarked extension (len %u/%zu)", 3281da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 3291da177e4SLinus Torvalds offset, next, tmp, nlen); 3301da177e4SLinus Torvalds return -EIO; 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds 3335b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: ext %u/%zu", 3341da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 3351da177e4SLinus Torvalds next, tmp, nlen); 3361da177e4SLinus Torvalds next++; 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds /* skip if starts before the current position */ 3401da177e4SLinus Torvalds if (offset < curr) 3411da177e4SLinus Torvalds continue; 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds /* found the next entry */ 3441bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 3451da177e4SLinus Torvalds ntohl(dire->u.vnode), 3465cf9dd55SDavid Howells (ctx->actor == afs_lookup_filldir || 3475cf9dd55SDavid Howells ctx->actor == afs_lookup_one_filldir)? 3481bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 3491da177e4SLinus Torvalds _leave(" = 0 [full]"); 3501da177e4SLinus Torvalds return 0; 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds 3531bbae9f8SAl Viro ctx->pos = blkoff + next * sizeof(union afs_dirent); 3541da177e4SLinus Torvalds } 3551da177e4SLinus Torvalds 3561da177e4SLinus Torvalds _leave(" = 1 [more]"); 3571da177e4SLinus Torvalds return 1; 358ec26815aSDavid Howells } 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds /* 36108e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 3621da177e4SLinus Torvalds */ 3631bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 3641bbae9f8SAl Viro struct key *key) 3651da177e4SLinus Torvalds { 3661da177e4SLinus Torvalds union afs_dir_block *dblock; 3671da177e4SLinus Torvalds struct afs_dir_page *dbuf; 3681da177e4SLinus Torvalds struct page *page; 3691da177e4SLinus Torvalds unsigned blkoff, limit; 3701da177e4SLinus Torvalds int ret; 3711da177e4SLinus Torvalds 3721bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 3731da177e4SLinus Torvalds 37408e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 3751da177e4SLinus Torvalds _leave(" = -ESTALE"); 3761da177e4SLinus Torvalds return -ESTALE; 3771da177e4SLinus Torvalds } 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 3801bbae9f8SAl Viro ctx->pos += sizeof(union afs_dirent) - 1; 3811bbae9f8SAl Viro ctx->pos &= ~(sizeof(union afs_dirent) - 1); 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds /* walk through the blocks in sequence */ 3841da177e4SLinus Torvalds ret = 0; 3851bbae9f8SAl Viro while (ctx->pos < dir->i_size) { 3861bbae9f8SAl Viro blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1); 3871da177e4SLinus Torvalds 3881da177e4SLinus Torvalds /* fetch the appropriate page from the directory */ 38900d3b7a4SDavid Howells page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); 3901da177e4SLinus Torvalds if (IS_ERR(page)) { 3911da177e4SLinus Torvalds ret = PTR_ERR(page); 3921da177e4SLinus Torvalds break; 3931da177e4SLinus Torvalds } 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 3961da177e4SLinus Torvalds 3971da177e4SLinus Torvalds dbuf = page_address(page); 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 4001da177e4SLinus Torvalds do { 4011da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 4021da177e4SLinus Torvalds sizeof(union afs_dir_block)]; 4031bbae9f8SAl Viro ret = afs_dir_iterate_block(ctx, dblock, blkoff); 4041da177e4SLinus Torvalds if (ret != 1) { 4051da177e4SLinus Torvalds afs_dir_put_page(page); 4061da177e4SLinus Torvalds goto out; 4071da177e4SLinus Torvalds } 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds blkoff += sizeof(union afs_dir_block); 4101da177e4SLinus Torvalds 4111bbae9f8SAl Viro } while (ctx->pos < dir->i_size && blkoff < limit); 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds afs_dir_put_page(page); 4141da177e4SLinus Torvalds ret = 0; 4151da177e4SLinus Torvalds } 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds out: 4181da177e4SLinus Torvalds _leave(" = %d", ret); 4191da177e4SLinus Torvalds return ret; 420ec26815aSDavid Howells } 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds /* 4231da177e4SLinus Torvalds * read an AFS directory 4241da177e4SLinus Torvalds */ 4251bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx) 4261da177e4SLinus Torvalds { 427215804a9SDavid Howells return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file)); 428ec26815aSDavid Howells } 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds /* 4315cf9dd55SDavid Howells * Search the directory for a single name 4321da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 4331da177e4SLinus Torvalds * uniquifier through dtype 4341da177e4SLinus Torvalds */ 4355cf9dd55SDavid Howells static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, 436ac7576f4SMiklos Szeredi int nlen, loff_t fpos, u64 ino, unsigned dtype) 4371da177e4SLinus Torvalds { 4385cf9dd55SDavid Howells struct afs_lookup_one_cookie *cookie = 4395cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_one_cookie, ctx); 4401da177e4SLinus Torvalds 4411bbae9f8SAl Viro _enter("{%s,%u},%s,%u,,%llu,%u", 4421bbae9f8SAl Viro cookie->name.name, cookie->name.len, name, nlen, 443ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 4441da177e4SLinus Torvalds 44508e0e7c8SDavid Howells /* insanity checks first */ 44608e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 44708e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 44808e0e7c8SDavid Howells 4491bbae9f8SAl Viro if (cookie->name.len != nlen || 4501bbae9f8SAl Viro memcmp(cookie->name.name, name, nlen) != 0) { 4511da177e4SLinus Torvalds _leave(" = 0 [no]"); 4521da177e4SLinus Torvalds return 0; 4531da177e4SLinus Torvalds } 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds cookie->fid.vnode = ino; 4561da177e4SLinus Torvalds cookie->fid.unique = dtype; 4571da177e4SLinus Torvalds cookie->found = 1; 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds _leave(" = -1 [found]"); 4601da177e4SLinus Torvalds return -1; 461ec26815aSDavid Howells } 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds /* 4645cf9dd55SDavid Howells * Do a lookup of a single name in a directory 465260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 4661da177e4SLinus Torvalds */ 4675cf9dd55SDavid Howells static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, 46800d3b7a4SDavid Howells struct afs_fid *fid, struct key *key) 4691da177e4SLinus Torvalds { 4701bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 4715cf9dd55SDavid Howells struct afs_lookup_one_cookie cookie = { 4725cf9dd55SDavid Howells .ctx.actor = afs_lookup_one_filldir, 4731bbae9f8SAl Viro .name = dentry->d_name, 4741bbae9f8SAl Viro .fid.vid = as->volume->vid 4751bbae9f8SAl Viro }; 4761da177e4SLinus Torvalds int ret; 4771da177e4SLinus Torvalds 478a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds /* search the directory */ 4811bbae9f8SAl Viro ret = afs_dir_iterate(dir, &cookie.ctx, key); 4821da177e4SLinus Torvalds if (ret < 0) { 48308e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 48408e0e7c8SDavid Howells return ret; 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds ret = -ENOENT; 4881da177e4SLinus Torvalds if (!cookie.found) { 48908e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 49008e0e7c8SDavid Howells return -ENOENT; 49108e0e7c8SDavid Howells } 49208e0e7c8SDavid Howells 49308e0e7c8SDavid Howells *fid = cookie.fid; 49408e0e7c8SDavid Howells _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); 49508e0e7c8SDavid Howells return 0; 49608e0e7c8SDavid Howells } 49708e0e7c8SDavid Howells 49808e0e7c8SDavid Howells /* 4995cf9dd55SDavid Howells * search the directory for a name 5005cf9dd55SDavid Howells * - if afs_dir_iterate_block() spots this function, it'll pass the FID 5015cf9dd55SDavid Howells * uniquifier through dtype 5025cf9dd55SDavid Howells */ 5035cf9dd55SDavid Howells static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 5045cf9dd55SDavid Howells int nlen, loff_t fpos, u64 ino, unsigned dtype) 5055cf9dd55SDavid Howells { 5065cf9dd55SDavid Howells struct afs_lookup_cookie *cookie = 5075cf9dd55SDavid Howells container_of(ctx, struct afs_lookup_cookie, ctx); 5085cf9dd55SDavid Howells int ret; 5095cf9dd55SDavid Howells 5105cf9dd55SDavid Howells _enter("{%s,%u},%s,%u,,%llu,%u", 5115cf9dd55SDavid Howells cookie->name.name, cookie->name.len, name, nlen, 5125cf9dd55SDavid Howells (unsigned long long) ino, dtype); 5135cf9dd55SDavid Howells 5145cf9dd55SDavid Howells /* insanity checks first */ 5155cf9dd55SDavid Howells BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 5165cf9dd55SDavid Howells BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 5175cf9dd55SDavid Howells 5185cf9dd55SDavid Howells if (cookie->found) { 5195cf9dd55SDavid Howells if (cookie->nr_fids < 50) { 5205cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].vnode = ino; 5215cf9dd55SDavid Howells cookie->fids[cookie->nr_fids].unique = dtype; 5225cf9dd55SDavid Howells cookie->nr_fids++; 5235cf9dd55SDavid Howells } 5245cf9dd55SDavid Howells } else if (cookie->name.len == nlen && 5255cf9dd55SDavid Howells memcmp(cookie->name.name, name, nlen) == 0) { 5265cf9dd55SDavid Howells cookie->fids[0].vnode = ino; 5275cf9dd55SDavid Howells cookie->fids[0].unique = dtype; 5285cf9dd55SDavid Howells cookie->found = 1; 5295cf9dd55SDavid Howells if (cookie->one_only) 5305cf9dd55SDavid Howells return -1; 5315cf9dd55SDavid Howells } 5325cf9dd55SDavid Howells 5335cf9dd55SDavid Howells ret = cookie->nr_fids >= 50 ? -1 : 0; 5345cf9dd55SDavid Howells _leave(" = %d", ret); 5355cf9dd55SDavid Howells return ret; 5365cf9dd55SDavid Howells } 5375cf9dd55SDavid Howells 5385cf9dd55SDavid Howells /* 5395cf9dd55SDavid Howells * Do a lookup in a directory. We make use of bulk lookup to query a slew of 5405cf9dd55SDavid Howells * files in one go and create inodes for them. The inode of the file we were 5415cf9dd55SDavid Howells * asked for is returned. 5425cf9dd55SDavid Howells */ 5435cf9dd55SDavid Howells static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 5445cf9dd55SDavid Howells struct key *key) 5455cf9dd55SDavid Howells { 5465cf9dd55SDavid Howells struct afs_lookup_cookie *cookie; 5475cf9dd55SDavid Howells struct afs_cb_interest *cbi = NULL; 5485cf9dd55SDavid Howells struct afs_super_info *as = dir->i_sb->s_fs_info; 5495cf9dd55SDavid Howells struct afs_iget_data data; 5505cf9dd55SDavid Howells struct afs_fs_cursor fc; 5515cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 5525cf9dd55SDavid Howells struct inode *inode = NULL; 5535cf9dd55SDavid Howells int ret, i; 5545cf9dd55SDavid Howells 5555cf9dd55SDavid Howells _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 5565cf9dd55SDavid Howells 5575cf9dd55SDavid Howells cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 5585cf9dd55SDavid Howells if (!cookie) 5595cf9dd55SDavid Howells return ERR_PTR(-ENOMEM); 5605cf9dd55SDavid Howells 5615cf9dd55SDavid Howells cookie->ctx.actor = afs_lookup_filldir; 5625cf9dd55SDavid Howells cookie->name = dentry->d_name; 5635cf9dd55SDavid Howells cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */ 5645cf9dd55SDavid Howells 5655cf9dd55SDavid Howells read_seqlock_excl(&dvnode->cb_lock); 5665cf9dd55SDavid Howells if (dvnode->cb_interest && 5675cf9dd55SDavid Howells dvnode->cb_interest->server && 5685cf9dd55SDavid Howells test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags)) 5695cf9dd55SDavid Howells cookie->one_only = true; 5705cf9dd55SDavid Howells read_sequnlock_excl(&dvnode->cb_lock); 5715cf9dd55SDavid Howells 5725cf9dd55SDavid Howells for (i = 0; i < 50; i++) 5735cf9dd55SDavid Howells cookie->fids[i].vid = as->volume->vid; 5745cf9dd55SDavid Howells 5755cf9dd55SDavid Howells /* search the directory */ 5765cf9dd55SDavid Howells ret = afs_dir_iterate(dir, &cookie->ctx, key); 5775cf9dd55SDavid Howells if (ret < 0) { 5785cf9dd55SDavid Howells inode = ERR_PTR(ret); 5795cf9dd55SDavid Howells goto out; 5805cf9dd55SDavid Howells } 5815cf9dd55SDavid Howells 5825cf9dd55SDavid Howells inode = ERR_PTR(-ENOENT); 5835cf9dd55SDavid Howells if (!cookie->found) 5845cf9dd55SDavid Howells goto out; 5855cf9dd55SDavid Howells 5865cf9dd55SDavid Howells /* Check to see if we already have an inode for the primary fid. */ 5875cf9dd55SDavid Howells data.volume = dvnode->volume; 5885cf9dd55SDavid Howells data.fid = cookie->fids[0]; 5895cf9dd55SDavid Howells inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data); 5905cf9dd55SDavid Howells if (inode) 5915cf9dd55SDavid Howells goto out; 5925cf9dd55SDavid Howells 5935cf9dd55SDavid Howells /* Need space for examining all the selected files */ 5945cf9dd55SDavid Howells inode = ERR_PTR(-ENOMEM); 5955cf9dd55SDavid Howells cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status), 5965cf9dd55SDavid Howells GFP_KERNEL); 5975cf9dd55SDavid Howells if (!cookie->statuses) 5985cf9dd55SDavid Howells goto out; 5995cf9dd55SDavid Howells 6005cf9dd55SDavid Howells cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback), 6015cf9dd55SDavid Howells GFP_KERNEL); 6025cf9dd55SDavid Howells if (!cookie->callbacks) 6035cf9dd55SDavid Howells goto out_s; 6045cf9dd55SDavid Howells 6055cf9dd55SDavid Howells /* Try FS.InlineBulkStatus first. Abort codes for the individual 6065cf9dd55SDavid Howells * lookups contained therein are stored in the reply without aborting 6075cf9dd55SDavid Howells * the whole operation. 6085cf9dd55SDavid Howells */ 6095cf9dd55SDavid Howells if (cookie->one_only) 6105cf9dd55SDavid Howells goto no_inline_bulk_status; 6115cf9dd55SDavid Howells 6125cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 6135cf9dd55SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 6145cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 6155cf9dd55SDavid Howells if (test_bit(AFS_SERVER_FL_NO_IBULK, 6165cf9dd55SDavid Howells &fc.cbi->server->flags)) { 6175cf9dd55SDavid Howells fc.ac.abort_code = RX_INVALID_OPERATION; 6185cf9dd55SDavid Howells fc.ac.error = -ECONNABORTED; 6195cf9dd55SDavid Howells break; 6205cf9dd55SDavid Howells } 6215cf9dd55SDavid Howells afs_fs_inline_bulk_status(&fc, 6225cf9dd55SDavid Howells afs_v2net(dvnode), 6235cf9dd55SDavid Howells cookie->fids, 6245cf9dd55SDavid Howells cookie->statuses, 6255cf9dd55SDavid Howells cookie->callbacks, 6265cf9dd55SDavid Howells cookie->nr_fids, NULL); 6275cf9dd55SDavid Howells } 6285cf9dd55SDavid Howells 6295cf9dd55SDavid Howells if (fc.ac.error == 0) 6305cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 6315cf9dd55SDavid Howells if (fc.ac.abort_code == RX_INVALID_OPERATION) 6325cf9dd55SDavid Howells set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags); 6335cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 6345cf9dd55SDavid Howells } 6355cf9dd55SDavid Howells 6365cf9dd55SDavid Howells if (!IS_ERR(inode)) 6375cf9dd55SDavid Howells goto success; 6385cf9dd55SDavid Howells if (fc.ac.abort_code != RX_INVALID_OPERATION) 6395cf9dd55SDavid Howells goto out_c; 6405cf9dd55SDavid Howells 6415cf9dd55SDavid Howells no_inline_bulk_status: 6425cf9dd55SDavid Howells /* We could try FS.BulkStatus next, but this aborts the entire op if 6435cf9dd55SDavid Howells * any of the lookups fails - so, for the moment, revert to 6445cf9dd55SDavid Howells * FS.FetchStatus for just the primary fid. 6455cf9dd55SDavid Howells */ 6465cf9dd55SDavid Howells cookie->nr_fids = 1; 6475cf9dd55SDavid Howells inode = ERR_PTR(-ERESTARTSYS); 6485cf9dd55SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 6495cf9dd55SDavid Howells while (afs_select_fileserver(&fc)) { 6505cf9dd55SDavid Howells afs_fs_fetch_status(&fc, 6515cf9dd55SDavid Howells afs_v2net(dvnode), 6525cf9dd55SDavid Howells cookie->fids, 6535cf9dd55SDavid Howells cookie->statuses, 6545cf9dd55SDavid Howells cookie->callbacks, 6555cf9dd55SDavid Howells NULL); 6565cf9dd55SDavid Howells } 6575cf9dd55SDavid Howells 6585cf9dd55SDavid Howells if (fc.ac.error == 0) 6595cf9dd55SDavid Howells cbi = afs_get_cb_interest(fc.cbi); 6605cf9dd55SDavid Howells inode = ERR_PTR(afs_end_vnode_operation(&fc)); 6615cf9dd55SDavid Howells } 6625cf9dd55SDavid Howells 6635cf9dd55SDavid Howells if (IS_ERR(inode)) 6645cf9dd55SDavid Howells goto out_c; 6655cf9dd55SDavid Howells 6665cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) 6675cf9dd55SDavid Howells cookie->statuses[i].abort_code = 0; 6685cf9dd55SDavid Howells 6695cf9dd55SDavid Howells success: 6705cf9dd55SDavid Howells /* Turn all the files into inodes and save the first one - which is the 6715cf9dd55SDavid Howells * one we actually want. 6725cf9dd55SDavid Howells */ 6735cf9dd55SDavid Howells if (cookie->statuses[0].abort_code != 0) 6745cf9dd55SDavid Howells inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code)); 6755cf9dd55SDavid Howells 6765cf9dd55SDavid Howells for (i = 0; i < cookie->nr_fids; i++) { 6775cf9dd55SDavid Howells struct inode *ti; 6785cf9dd55SDavid Howells 6795cf9dd55SDavid Howells if (cookie->statuses[i].abort_code != 0) 6805cf9dd55SDavid Howells continue; 6815cf9dd55SDavid Howells 6825cf9dd55SDavid Howells ti = afs_iget(dir->i_sb, key, &cookie->fids[i], 6835cf9dd55SDavid Howells &cookie->statuses[i], 6845cf9dd55SDavid Howells &cookie->callbacks[i], 6855cf9dd55SDavid Howells cbi); 6865cf9dd55SDavid Howells if (i == 0) { 6875cf9dd55SDavid Howells inode = ti; 6885cf9dd55SDavid Howells } else { 6895cf9dd55SDavid Howells if (!IS_ERR(ti)) 6905cf9dd55SDavid Howells iput(ti); 6915cf9dd55SDavid Howells } 6925cf9dd55SDavid Howells } 6935cf9dd55SDavid Howells 6945cf9dd55SDavid Howells out_c: 6955cf9dd55SDavid Howells afs_put_cb_interest(afs_v2net(dvnode), cbi); 6965cf9dd55SDavid Howells kfree(cookie->callbacks); 6975cf9dd55SDavid Howells out_s: 6985cf9dd55SDavid Howells kfree(cookie->statuses); 6995cf9dd55SDavid Howells out: 7005cf9dd55SDavid Howells kfree(cookie); 7015cf9dd55SDavid Howells return inode; 7025cf9dd55SDavid Howells } 7035cf9dd55SDavid Howells 7045cf9dd55SDavid Howells /* 7054d673da1SDavid Howells * Probe to see if a cell may exist. This prevents positive dentries from 7064d673da1SDavid Howells * being created unnecessarily. 7074d673da1SDavid Howells */ 7084d673da1SDavid Howells static int afs_probe_cell_name(struct dentry *dentry) 7094d673da1SDavid Howells { 7104d673da1SDavid Howells struct afs_cell *cell; 7114d673da1SDavid Howells const char *name = dentry->d_name.name; 7124d673da1SDavid Howells size_t len = dentry->d_name.len; 7134d673da1SDavid Howells int ret; 7144d673da1SDavid Howells 7154d673da1SDavid Howells /* Names prefixed with a dot are R/W mounts. */ 7164d673da1SDavid Howells if (name[0] == '.') { 7174d673da1SDavid Howells if (len == 1) 7184d673da1SDavid Howells return -EINVAL; 7194d673da1SDavid Howells name++; 7204d673da1SDavid Howells len--; 7214d673da1SDavid Howells } 7224d673da1SDavid Howells 7234d673da1SDavid Howells cell = afs_lookup_cell_rcu(afs_d2net(dentry), name, len); 7244d673da1SDavid Howells if (!IS_ERR(cell)) { 7254d673da1SDavid Howells afs_put_cell(afs_d2net(dentry), cell); 7264d673da1SDavid Howells return 0; 7274d673da1SDavid Howells } 7284d673da1SDavid Howells 7294d673da1SDavid Howells ret = dns_query("afsdb", name, len, "ipv4", NULL, NULL); 7304d673da1SDavid Howells if (ret == -ENODATA) 7314d673da1SDavid Howells ret = -EDESTADDRREQ; 7324d673da1SDavid Howells return ret; 7334d673da1SDavid Howells } 7344d673da1SDavid Howells 7354d673da1SDavid Howells /* 736bec5eb61Swanglei * Try to auto mount the mountpoint with pseudo directory, if the autocell 737bec5eb61Swanglei * operation is setted. 738bec5eb61Swanglei */ 7395cf9dd55SDavid Howells static struct inode *afs_try_auto_mntpt(struct dentry *dentry, struct inode *dir) 740bec5eb61Swanglei { 741bec5eb61Swanglei struct afs_vnode *vnode = AFS_FS_I(dir); 742bec5eb61Swanglei struct inode *inode; 7434d673da1SDavid Howells int ret = -ENOENT; 744bec5eb61Swanglei 7454d673da1SDavid Howells _enter("%p{%pd}, {%x:%u}", 7464d673da1SDavid Howells dentry, dentry, vnode->fid.vid, vnode->fid.vnode); 747bec5eb61Swanglei 7484d673da1SDavid Howells if (!test_bit(AFS_VNODE_AUTOCELL, &vnode->flags)) 749bec5eb61Swanglei goto out; 750bec5eb61Swanglei 7514d673da1SDavid Howells ret = afs_probe_cell_name(dentry); 7524d673da1SDavid Howells if (ret < 0) 7534d673da1SDavid Howells goto out; 7544d673da1SDavid Howells 7554d673da1SDavid Howells inode = afs_iget_pseudo_dir(dir->i_sb, false); 756bec5eb61Swanglei if (IS_ERR(inode)) { 757bec5eb61Swanglei ret = PTR_ERR(inode); 758bec5eb61Swanglei goto out; 759bec5eb61Swanglei } 760bec5eb61Swanglei 761bec5eb61Swanglei _leave("= %p", inode); 762bec5eb61Swanglei return inode; 763bec5eb61Swanglei 764bec5eb61Swanglei out: 765bec5eb61Swanglei _leave("= %d", ret); 766bec5eb61Swanglei return ERR_PTR(ret); 767bec5eb61Swanglei } 768bec5eb61Swanglei 769bec5eb61Swanglei /* 77008e0e7c8SDavid Howells * look up an entry in a directory 77108e0e7c8SDavid Howells */ 772260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 77300cd8dd3SAl Viro unsigned int flags) 77408e0e7c8SDavid Howells { 7755cf9dd55SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 77608e0e7c8SDavid Howells struct inode *inode; 77700d3b7a4SDavid Howells struct key *key; 77808e0e7c8SDavid Howells int ret; 77908e0e7c8SDavid Howells 780a455589fSAl Viro _enter("{%x:%u},%p{%pd},", 7815cf9dd55SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 782260a9803SDavid Howells 7832b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 78408e0e7c8SDavid Howells 78545222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 78608e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 78708e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 78808e0e7c8SDavid Howells } 78908e0e7c8SDavid Howells 7905cf9dd55SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 79108e0e7c8SDavid Howells _leave(" = -ESTALE"); 79208e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 79308e0e7c8SDavid Howells } 79408e0e7c8SDavid Howells 7955cf9dd55SDavid Howells key = afs_request_key(dvnode->volume->cell); 79600d3b7a4SDavid Howells if (IS_ERR(key)) { 79700d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 798e231c2eeSDavid Howells return ERR_CAST(key); 79900d3b7a4SDavid Howells } 80000d3b7a4SDavid Howells 8015cf9dd55SDavid Howells ret = afs_validate(dvnode, key); 80208e0e7c8SDavid Howells if (ret < 0) { 80300d3b7a4SDavid Howells key_put(key); 804260a9803SDavid Howells _leave(" = %d [val]", ret); 8051da177e4SLinus Torvalds return ERR_PTR(ret); 8061da177e4SLinus Torvalds } 8071da177e4SLinus Torvalds 8085cf9dd55SDavid Howells inode = afs_do_lookup(dir, dentry, key); 8095cf9dd55SDavid Howells if (IS_ERR(inode)) { 8105cf9dd55SDavid Howells ret = PTR_ERR(inode); 8114d673da1SDavid Howells if (ret == -ENOENT) { 8125cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 813bec5eb61Swanglei if (!IS_ERR(inode)) { 814bec5eb61Swanglei key_put(key); 815bec5eb61Swanglei goto success; 816bec5eb61Swanglei } 817bec5eb61Swanglei 818bec5eb61Swanglei ret = PTR_ERR(inode); 8194d673da1SDavid Howells } 8204d673da1SDavid Howells 821260a9803SDavid Howells key_put(key); 822260a9803SDavid Howells if (ret == -ENOENT) { 823260a9803SDavid Howells d_add(dentry, NULL); 824260a9803SDavid Howells _leave(" = NULL [negative]"); 825260a9803SDavid Howells return NULL; 826260a9803SDavid Howells } 827260a9803SDavid Howells _leave(" = %d [do]", ret); 828260a9803SDavid Howells return ERR_PTR(ret); 829260a9803SDavid Howells } 8305cf9dd55SDavid Howells dentry->d_fsdata = (void *)(unsigned long)dvnode->status.data_version; 831260a9803SDavid Howells 8321da177e4SLinus Torvalds /* instantiate the dentry */ 83300d3b7a4SDavid Howells key_put(key); 83408e0e7c8SDavid Howells if (IS_ERR(inode)) { 83508e0e7c8SDavid Howells _leave(" = %ld", PTR_ERR(inode)); 836e231c2eeSDavid Howells return ERR_CAST(inode); 8371da177e4SLinus Torvalds } 8381da177e4SLinus Torvalds 839bec5eb61Swanglei success: 8401da177e4SLinus Torvalds d_add(dentry, inode); 8415cf9dd55SDavid Howells _leave(" = 0 { ino=%lu v=%u }", 8422b0143b5SDavid Howells d_inode(dentry)->i_ino, 8432b0143b5SDavid Howells d_inode(dentry)->i_generation); 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvalds return NULL; 846ec26815aSDavid Howells } 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds /* 8494d673da1SDavid Howells * Look up an entry in a dynroot directory. 8504d673da1SDavid Howells */ 8514d673da1SDavid Howells static struct dentry *afs_dynroot_lookup(struct inode *dir, struct dentry *dentry, 8524d673da1SDavid Howells unsigned int flags) 8534d673da1SDavid Howells { 8544d673da1SDavid Howells struct afs_vnode *vnode; 8554d673da1SDavid Howells struct inode *inode; 8564d673da1SDavid Howells int ret; 8574d673da1SDavid Howells 8584d673da1SDavid Howells vnode = AFS_FS_I(dir); 8594d673da1SDavid Howells 8604d673da1SDavid Howells _enter("%pd", dentry); 8614d673da1SDavid Howells 8624d673da1SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 8634d673da1SDavid Howells 8644d673da1SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 8654d673da1SDavid Howells _leave(" = -ENAMETOOLONG"); 8664d673da1SDavid Howells return ERR_PTR(-ENAMETOOLONG); 8674d673da1SDavid Howells } 8684d673da1SDavid Howells 8695cf9dd55SDavid Howells inode = afs_try_auto_mntpt(dentry, dir); 8704d673da1SDavid Howells if (IS_ERR(inode)) { 8714d673da1SDavid Howells ret = PTR_ERR(inode); 8724d673da1SDavid Howells if (ret == -ENOENT) { 8734d673da1SDavid Howells d_add(dentry, NULL); 8744d673da1SDavid Howells _leave(" = NULL [negative]"); 8754d673da1SDavid Howells return NULL; 8764d673da1SDavid Howells } 8774d673da1SDavid Howells _leave(" = %d [do]", ret); 8784d673da1SDavid Howells return ERR_PTR(ret); 8794d673da1SDavid Howells } 8804d673da1SDavid Howells 8814d673da1SDavid Howells d_add(dentry, inode); 8824d673da1SDavid Howells _leave(" = 0 { ino=%lu v=%u }", 8834d673da1SDavid Howells d_inode(dentry)->i_ino, d_inode(dentry)->i_generation); 8844d673da1SDavid Howells return NULL; 8854d673da1SDavid Howells } 8864d673da1SDavid Howells 8874d673da1SDavid Howells /* 8881da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 8891da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 8901da177e4SLinus Torvalds * inode 8911da177e4SLinus Torvalds */ 8920b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 8931da177e4SLinus Torvalds { 8944d673da1SDavid Howells struct afs_super_info *as = dentry->d_sb->s_fs_info; 895260a9803SDavid Howells struct afs_vnode *vnode, *dir; 896dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 8971da177e4SLinus Torvalds struct dentry *parent; 898c435ee34SDavid Howells struct inode *inode; 89900d3b7a4SDavid Howells struct key *key; 900260a9803SDavid Howells void *dir_version; 9011da177e4SLinus Torvalds int ret; 9021da177e4SLinus Torvalds 9030b728e19SAl Viro if (flags & LOOKUP_RCU) 90434286d66SNick Piggin return -ECHILD; 90534286d66SNick Piggin 9064d673da1SDavid Howells if (as->dyn_root) 9074d673da1SDavid Howells return 1; 9084d673da1SDavid Howells 909c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 9102b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 911a455589fSAl Viro _enter("{v={%x:%u} n=%pd fl=%lx},", 912a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 913260a9803SDavid Howells vnode->flags); 914c435ee34SDavid Howells } else { 915a455589fSAl Viro _enter("{neg n=%pd}", dentry); 916c435ee34SDavid Howells } 9171da177e4SLinus Torvalds 918260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 91900d3b7a4SDavid Howells if (IS_ERR(key)) 92000d3b7a4SDavid Howells key = NULL; 92100d3b7a4SDavid Howells 922c435ee34SDavid Howells if (d_really_is_positive(dentry)) { 923c435ee34SDavid Howells inode = d_inode(dentry); 924c435ee34SDavid Howells if (inode) { 925c435ee34SDavid Howells vnode = AFS_FS_I(inode); 926c435ee34SDavid Howells afs_validate(vnode, key); 927c435ee34SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 928c435ee34SDavid Howells goto out_bad; 929c435ee34SDavid Howells } 930c435ee34SDavid Howells } 931c435ee34SDavid Howells 9321da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 93308e0e7c8SDavid Howells parent = dget_parent(dentry); 9342b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 9351da177e4SLinus Torvalds 936260a9803SDavid Howells /* validate the parent directory */ 937260a9803SDavid Howells afs_validate(dir, key); 938260a9803SDavid Howells 939260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 940a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 941c435ee34SDavid Howells goto out_bad_parent; 9421da177e4SLinus Torvalds } 9431da177e4SLinus Torvalds 944260a9803SDavid Howells dir_version = (void *) (unsigned long) dir->status.data_version; 945260a9803SDavid Howells if (dentry->d_fsdata == dir_version) 946260a9803SDavid Howells goto out_valid; /* the dir contents are unchanged */ 947260a9803SDavid Howells 94808e0e7c8SDavid Howells _debug("dir modified"); 9491da177e4SLinus Torvalds 9501da177e4SLinus Torvalds /* search the directory for this vnode */ 9515cf9dd55SDavid Howells ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key); 952260a9803SDavid Howells switch (ret) { 953260a9803SDavid Howells case 0: 954260a9803SDavid Howells /* the filename maps to something */ 9552b0143b5SDavid Howells if (d_really_is_negative(dentry)) 956c435ee34SDavid Howells goto out_bad_parent; 957c435ee34SDavid Howells inode = d_inode(dentry); 958c435ee34SDavid Howells if (is_bad_inode(inode)) { 959a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 960a455589fSAl Viro dentry); 961c435ee34SDavid Howells goto out_bad_parent; 9621da177e4SLinus Torvalds } 9631da177e4SLinus Torvalds 964c435ee34SDavid Howells vnode = AFS_FS_I(inode); 965c435ee34SDavid Howells 9661da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 9671da177e4SLinus Torvalds * different file */ 96808e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 969a455589fSAl Viro _debug("%pd: dirent changed [%u != %u]", 970a455589fSAl Viro dentry, fid.vnode, 97108e0e7c8SDavid Howells vnode->fid.vnode); 9721da177e4SLinus Torvalds goto not_found; 9731da177e4SLinus Torvalds } 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 976260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 977260a9803SDavid Howells * been reused */ 97808e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 979a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 980a455589fSAl Viro dentry, fid.unique, 9817a224228SJean Noel Cordenner vnode->fid.unique, 982c435ee34SDavid Howells vnode->vfs_inode.i_generation); 983c435ee34SDavid Howells write_seqlock(&vnode->cb_lock); 98408e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 985c435ee34SDavid Howells write_sequnlock(&vnode->cb_lock); 986260a9803SDavid Howells goto not_found; 987260a9803SDavid Howells } 988260a9803SDavid Howells goto out_valid; 989260a9803SDavid Howells 990260a9803SDavid Howells case -ENOENT: 991260a9803SDavid Howells /* the filename is unknown */ 992a455589fSAl Viro _debug("%pd: dirent not found", dentry); 9932b0143b5SDavid Howells if (d_really_is_positive(dentry)) 994260a9803SDavid Howells goto not_found; 995260a9803SDavid Howells goto out_valid; 996260a9803SDavid Howells 997260a9803SDavid Howells default: 998a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 999a455589fSAl Viro parent, ret); 1000c435ee34SDavid Howells goto out_bad_parent; 10011da177e4SLinus Torvalds } 100208e0e7c8SDavid Howells 10031da177e4SLinus Torvalds out_valid: 1004260a9803SDavid Howells dentry->d_fsdata = dir_version; 10051da177e4SLinus Torvalds dput(parent); 100600d3b7a4SDavid Howells key_put(key); 10071da177e4SLinus Torvalds _leave(" = 1 [valid]"); 10081da177e4SLinus Torvalds return 1; 10091da177e4SLinus Torvalds 10101da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 10111da177e4SLinus Torvalds not_found: 10121da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 10131da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 10141da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 10151da177e4SLinus Torvalds 1016c435ee34SDavid Howells out_bad_parent: 1017a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 10181da177e4SLinus Torvalds dput(parent); 1019c435ee34SDavid Howells out_bad: 102000d3b7a4SDavid Howells key_put(key); 10211da177e4SLinus Torvalds 10221da177e4SLinus Torvalds _leave(" = 0 [bad]"); 10231da177e4SLinus Torvalds return 0; 1024ec26815aSDavid Howells } 10251da177e4SLinus Torvalds 10261da177e4SLinus Torvalds /* 10271da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 10281da177e4SLinus Torvalds * sleep) 10291da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 10301da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 10311da177e4SLinus Torvalds */ 1032fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 10331da177e4SLinus Torvalds { 1034a455589fSAl Viro _enter("%pd", dentry); 10351da177e4SLinus Torvalds 10361da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 10371da177e4SLinus Torvalds goto zap; 10381da177e4SLinus Torvalds 10392b0143b5SDavid Howells if (d_really_is_positive(dentry) && 10402b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 10412b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 10421da177e4SLinus Torvalds goto zap; 10431da177e4SLinus Torvalds 10441da177e4SLinus Torvalds _leave(" = 0 [keep]"); 10451da177e4SLinus Torvalds return 0; 10461da177e4SLinus Torvalds 10471da177e4SLinus Torvalds zap: 10481da177e4SLinus Torvalds _leave(" = 1 [zap]"); 10491da177e4SLinus Torvalds return 1; 1050ec26815aSDavid Howells } 1051260a9803SDavid Howells 1052260a9803SDavid Howells /* 1053260a9803SDavid Howells * handle dentry release 1054260a9803SDavid Howells */ 1055260a9803SDavid Howells static void afs_d_release(struct dentry *dentry) 1056260a9803SDavid Howells { 1057a455589fSAl Viro _enter("%pd", dentry); 1058260a9803SDavid Howells } 1059260a9803SDavid Howells 1060260a9803SDavid Howells /* 1061d2ddc776SDavid Howells * Create a new inode for create/mkdir/symlink 1062d2ddc776SDavid Howells */ 1063d2ddc776SDavid Howells static void afs_vnode_new_inode(struct afs_fs_cursor *fc, 1064d2ddc776SDavid Howells struct dentry *new_dentry, 1065d2ddc776SDavid Howells struct afs_fid *newfid, 1066d2ddc776SDavid Howells struct afs_file_status *newstatus, 1067d2ddc776SDavid Howells struct afs_callback *newcb) 1068d2ddc776SDavid Howells { 1069d2ddc776SDavid Howells struct inode *inode; 1070d2ddc776SDavid Howells 1071d2ddc776SDavid Howells if (fc->ac.error < 0) 1072d2ddc776SDavid Howells return; 1073d2ddc776SDavid Howells 1074bc1527dcSDavid Howells d_drop(new_dentry); 1075bc1527dcSDavid Howells 1076d2ddc776SDavid Howells inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key, 1077d2ddc776SDavid Howells newfid, newstatus, newcb, fc->cbi); 1078d2ddc776SDavid Howells if (IS_ERR(inode)) { 1079d2ddc776SDavid Howells /* ENOMEM or EINTR at a really inconvenient time - just abandon 1080d2ddc776SDavid Howells * the new directory on the server. 1081d2ddc776SDavid Howells */ 1082d2ddc776SDavid Howells fc->ac.error = PTR_ERR(inode); 1083d2ddc776SDavid Howells return; 1084d2ddc776SDavid Howells } 1085d2ddc776SDavid Howells 1086bc1527dcSDavid Howells d_add(new_dentry, inode); 1087d2ddc776SDavid Howells } 1088d2ddc776SDavid Howells 1089d2ddc776SDavid Howells /* 1090260a9803SDavid Howells * create a directory on an AFS filesystem 1091260a9803SDavid Howells */ 109218bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 1093260a9803SDavid Howells { 1094d2ddc776SDavid Howells struct afs_file_status newstatus; 1095d2ddc776SDavid Howells struct afs_fs_cursor fc; 1096d2ddc776SDavid Howells struct afs_callback newcb; 1097d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1098d2ddc776SDavid Howells struct afs_fid newfid; 1099260a9803SDavid Howells struct key *key; 1100260a9803SDavid Howells int ret; 1101260a9803SDavid Howells 1102d2ddc776SDavid Howells mode |= S_IFDIR; 1103260a9803SDavid Howells 1104a455589fSAl Viro _enter("{%x:%u},{%pd},%ho", 1105a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1106260a9803SDavid Howells 1107260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1108260a9803SDavid Howells if (IS_ERR(key)) { 1109260a9803SDavid Howells ret = PTR_ERR(key); 1110260a9803SDavid Howells goto error; 1111260a9803SDavid Howells } 1112260a9803SDavid Howells 1113d2ddc776SDavid Howells ret = -ERESTARTSYS; 1114d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1115d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1116d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1117d2ddc776SDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, 1118d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1119d2ddc776SDavid Howells } 1120d2ddc776SDavid Howells 1121d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1122d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1123d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1124d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1125260a9803SDavid Howells if (ret < 0) 1126d2ddc776SDavid Howells goto error_key; 11274433b691SDavid Howells } else { 11284433b691SDavid Howells goto error_key; 1129260a9803SDavid Howells } 1130260a9803SDavid Howells 1131260a9803SDavid Howells key_put(key); 1132260a9803SDavid Howells _leave(" = 0"); 1133260a9803SDavid Howells return 0; 1134260a9803SDavid Howells 1135d2ddc776SDavid Howells error_key: 1136260a9803SDavid Howells key_put(key); 1137260a9803SDavid Howells error: 1138260a9803SDavid Howells d_drop(dentry); 1139260a9803SDavid Howells _leave(" = %d", ret); 1140260a9803SDavid Howells return ret; 1141260a9803SDavid Howells } 1142260a9803SDavid Howells 1143260a9803SDavid Howells /* 1144d2ddc776SDavid Howells * Remove a subdir from a directory. 1145260a9803SDavid Howells */ 1146d2ddc776SDavid Howells static void afs_dir_remove_subdir(struct dentry *dentry) 1147260a9803SDavid Howells { 11482b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1149d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1150d2ddc776SDavid Howells 1151260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 1152260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1153c435ee34SDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1154260a9803SDavid Howells } 1155260a9803SDavid Howells } 1156260a9803SDavid Howells 1157260a9803SDavid Howells /* 1158d2ddc776SDavid Howells * remove a directory from an AFS filesystem 1159260a9803SDavid Howells */ 1160d2ddc776SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1161260a9803SDavid Howells { 1162d2ddc776SDavid Howells struct afs_fs_cursor fc; 1163d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1164260a9803SDavid Howells struct key *key; 1165260a9803SDavid Howells int ret; 1166260a9803SDavid Howells 1167a455589fSAl Viro _enter("{%x:%u},{%pd}", 1168a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 1169260a9803SDavid Howells 1170260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1171260a9803SDavid Howells if (IS_ERR(key)) { 1172260a9803SDavid Howells ret = PTR_ERR(key); 1173260a9803SDavid Howells goto error; 1174260a9803SDavid Howells } 1175260a9803SDavid Howells 1176d2ddc776SDavid Howells ret = -ERESTARTSYS; 1177d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1178d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1179d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1180d2ddc776SDavid Howells afs_fs_remove(&fc, dentry->d_name.name, true); 1181260a9803SDavid Howells } 1182260a9803SDavid Howells 1183d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1184d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1185d2ddc776SDavid Howells if (ret == 0) 1186d2ddc776SDavid Howells afs_dir_remove_subdir(dentry); 1187260a9803SDavid Howells } 1188260a9803SDavid Howells 1189260a9803SDavid Howells key_put(key); 1190d2ddc776SDavid Howells error: 1191d2ddc776SDavid Howells return ret; 1192d2ddc776SDavid Howells } 1193260a9803SDavid Howells 1194d2ddc776SDavid Howells /* 1195d2ddc776SDavid Howells * Remove a link to a file or symlink from a directory. 1196d2ddc776SDavid Howells * 1197d2ddc776SDavid Howells * If the file was not deleted due to excess hard links, the fileserver will 1198d2ddc776SDavid Howells * break the callback promise on the file - if it had one - before it returns 1199d2ddc776SDavid Howells * to us, and if it was deleted, it won't 1200d2ddc776SDavid Howells * 1201d2ddc776SDavid Howells * However, if we didn't have a callback promise outstanding, or it was 1202d2ddc776SDavid Howells * outstanding on a different server, then it won't break it either... 1203d2ddc776SDavid Howells */ 1204440fbc3aSDavid Howells static int afs_dir_remove_link(struct dentry *dentry, struct key *key, 1205440fbc3aSDavid Howells unsigned long d_version_before, 1206440fbc3aSDavid Howells unsigned long d_version_after) 1207d2ddc776SDavid Howells { 1208440fbc3aSDavid Howells bool dir_valid; 1209d2ddc776SDavid Howells int ret = 0; 1210d2ddc776SDavid Howells 1211440fbc3aSDavid Howells /* There were no intervening changes on the server if the version 1212440fbc3aSDavid Howells * number we got back was incremented by exactly 1. 1213440fbc3aSDavid Howells */ 1214440fbc3aSDavid Howells dir_valid = (d_version_after == d_version_before + 1); 1215440fbc3aSDavid Howells 1216d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1217d2ddc776SDavid Howells struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1218d2ddc776SDavid Howells 1219440fbc3aSDavid Howells if (dir_valid) { 1220440fbc3aSDavid Howells drop_nlink(&vnode->vfs_inode); 1221440fbc3aSDavid Howells if (vnode->vfs_inode.i_nlink == 0) { 1222440fbc3aSDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 1223440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1224440fbc3aSDavid Howells } 1225440fbc3aSDavid Howells ret = 0; 1226440fbc3aSDavid Howells } else { 1227440fbc3aSDavid Howells clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1228440fbc3aSDavid Howells 1229d2ddc776SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1230d2ddc776SDavid Howells kdebug("AFS_VNODE_DELETED"); 1231d2ddc776SDavid Howells 1232d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1233d2ddc776SDavid Howells if (ret == -ESTALE) 1234d2ddc776SDavid Howells ret = 0; 1235440fbc3aSDavid Howells } 1236d2ddc776SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 1237d2ddc776SDavid Howells } 1238d2ddc776SDavid Howells 1239d2ddc776SDavid Howells return ret; 1240d2ddc776SDavid Howells } 1241d2ddc776SDavid Howells 1242d2ddc776SDavid Howells /* 1243d2ddc776SDavid Howells * Remove a file or symlink from an AFS filesystem. 1244d2ddc776SDavid Howells */ 1245d2ddc776SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 1246d2ddc776SDavid Howells { 1247d2ddc776SDavid Howells struct afs_fs_cursor fc; 1248d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; 1249d2ddc776SDavid Howells struct key *key; 1250440fbc3aSDavid Howells unsigned long d_version = (unsigned long)dentry->d_fsdata; 1251d2ddc776SDavid Howells int ret; 1252d2ddc776SDavid Howells 1253d2ddc776SDavid Howells _enter("{%x:%u},{%pd}", 1254d2ddc776SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry); 1255d2ddc776SDavid Howells 1256d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1257d2ddc776SDavid Howells return -ENAMETOOLONG; 1258d2ddc776SDavid Howells 1259d2ddc776SDavid Howells key = afs_request_key(dvnode->volume->cell); 1260d2ddc776SDavid Howells if (IS_ERR(key)) { 1261d2ddc776SDavid Howells ret = PTR_ERR(key); 1262d2ddc776SDavid Howells goto error; 1263d2ddc776SDavid Howells } 1264d2ddc776SDavid Howells 1265d2ddc776SDavid Howells /* Try to make sure we have a callback promise on the victim. */ 1266d2ddc776SDavid Howells if (d_really_is_positive(dentry)) { 1267d2ddc776SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 1268d2ddc776SDavid Howells ret = afs_validate(vnode, key); 1269d2ddc776SDavid Howells if (ret < 0) 1270d2ddc776SDavid Howells goto error_key; 1271d2ddc776SDavid Howells } 1272d2ddc776SDavid Howells 1273d2ddc776SDavid Howells ret = -ERESTARTSYS; 1274d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1275d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1276d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1277d2ddc776SDavid Howells afs_fs_remove(&fc, dentry->d_name.name, false); 1278d2ddc776SDavid Howells } 1279d2ddc776SDavid Howells 1280d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1281d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1282d2ddc776SDavid Howells if (ret == 0) 1283440fbc3aSDavid Howells ret = afs_dir_remove_link( 1284440fbc3aSDavid Howells dentry, key, d_version, 1285440fbc3aSDavid Howells (unsigned long)dvnode->status.data_version); 1286d2ddc776SDavid Howells } 1287d2ddc776SDavid Howells 1288d2ddc776SDavid Howells error_key: 1289260a9803SDavid Howells key_put(key); 1290260a9803SDavid Howells error: 1291260a9803SDavid Howells _leave(" = %d", ret); 1292260a9803SDavid Howells return ret; 1293260a9803SDavid Howells } 1294260a9803SDavid Howells 1295260a9803SDavid Howells /* 1296260a9803SDavid Howells * create a regular file on an AFS filesystem 1297260a9803SDavid Howells */ 12984acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 1299ebfc3b49SAl Viro bool excl) 1300260a9803SDavid Howells { 1301d2ddc776SDavid Howells struct afs_fs_cursor fc; 1302d2ddc776SDavid Howells struct afs_file_status newstatus; 1303d2ddc776SDavid Howells struct afs_callback newcb; 130443dd388bSColin Ian King struct afs_vnode *dvnode = AFS_FS_I(dir); 1305d2ddc776SDavid Howells struct afs_fid newfid; 1306260a9803SDavid Howells struct key *key; 1307260a9803SDavid Howells int ret; 1308260a9803SDavid Howells 1309d2ddc776SDavid Howells mode |= S_IFREG; 1310260a9803SDavid Howells 1311a455589fSAl Viro _enter("{%x:%u},{%pd},%ho,", 1312a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1313260a9803SDavid Howells 1314d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1315d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1316d2ddc776SDavid Howells goto error; 1317d2ddc776SDavid Howells 1318260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1319260a9803SDavid Howells if (IS_ERR(key)) { 1320260a9803SDavid Howells ret = PTR_ERR(key); 1321260a9803SDavid Howells goto error; 1322260a9803SDavid Howells } 1323260a9803SDavid Howells 1324d2ddc776SDavid Howells ret = -ERESTARTSYS; 1325d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1326d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1327d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1328d2ddc776SDavid Howells afs_fs_create(&fc, dentry->d_name.name, mode, 1329d2ddc776SDavid Howells &newfid, &newstatus, &newcb); 1330d2ddc776SDavid Howells } 1331d2ddc776SDavid Howells 1332d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1333d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1334d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb); 1335d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1336260a9803SDavid Howells if (ret < 0) 1337d2ddc776SDavid Howells goto error_key; 13384433b691SDavid Howells } else { 13394433b691SDavid Howells goto error_key; 1340260a9803SDavid Howells } 1341260a9803SDavid Howells 1342260a9803SDavid Howells key_put(key); 1343260a9803SDavid Howells _leave(" = 0"); 1344260a9803SDavid Howells return 0; 1345260a9803SDavid Howells 1346d2ddc776SDavid Howells error_key: 1347260a9803SDavid Howells key_put(key); 1348260a9803SDavid Howells error: 1349260a9803SDavid Howells d_drop(dentry); 1350260a9803SDavid Howells _leave(" = %d", ret); 1351260a9803SDavid Howells return ret; 1352260a9803SDavid Howells } 1353260a9803SDavid Howells 1354260a9803SDavid Howells /* 1355260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1356260a9803SDavid Howells */ 1357260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1358260a9803SDavid Howells struct dentry *dentry) 1359260a9803SDavid Howells { 1360d2ddc776SDavid Howells struct afs_fs_cursor fc; 1361260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1362260a9803SDavid Howells struct key *key; 1363260a9803SDavid Howells int ret; 1364260a9803SDavid Howells 13652b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(from)); 1366260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1367260a9803SDavid Howells 1368a455589fSAl Viro _enter("{%x:%u},{%x:%u},{%pd}", 1369260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1370260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1371a455589fSAl Viro dentry); 1372260a9803SDavid Howells 1373d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1374d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1375d2ddc776SDavid Howells goto error; 1376d2ddc776SDavid Howells 1377260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1378260a9803SDavid Howells if (IS_ERR(key)) { 1379260a9803SDavid Howells ret = PTR_ERR(key); 1380260a9803SDavid Howells goto error; 1381260a9803SDavid Howells } 1382260a9803SDavid Howells 1383d2ddc776SDavid Howells ret = -ERESTARTSYS; 1384d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1385d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) { 1386d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1387bc1527dcSDavid Howells goto error_key; 1388d2ddc776SDavid Howells } 1389260a9803SDavid Howells 1390d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1391d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1392d2ddc776SDavid Howells fc.cb_break_2 = vnode->cb_break + vnode->cb_s_break; 1393d2ddc776SDavid Howells afs_fs_link(&fc, vnode, dentry->d_name.name); 1394d2ddc776SDavid Howells } 1395d2ddc776SDavid Howells 1396d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1397d2ddc776SDavid Howells afs_vnode_commit_status(&fc, vnode, fc.cb_break_2); 13987de9c6eeSAl Viro ihold(&vnode->vfs_inode); 1399260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1400d2ddc776SDavid Howells 1401d2ddc776SDavid Howells mutex_unlock(&vnode->io_lock); 1402d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1403d2ddc776SDavid Howells if (ret < 0) 1404d2ddc776SDavid Howells goto error_key; 14054433b691SDavid Howells } else { 14064433b691SDavid Howells goto error_key; 1407d2ddc776SDavid Howells } 1408d2ddc776SDavid Howells 1409260a9803SDavid Howells key_put(key); 1410260a9803SDavid Howells _leave(" = 0"); 1411260a9803SDavid Howells return 0; 1412260a9803SDavid Howells 1413d2ddc776SDavid Howells error_key: 1414260a9803SDavid Howells key_put(key); 1415260a9803SDavid Howells error: 1416260a9803SDavid Howells d_drop(dentry); 1417260a9803SDavid Howells _leave(" = %d", ret); 1418260a9803SDavid Howells return ret; 1419260a9803SDavid Howells } 1420260a9803SDavid Howells 1421260a9803SDavid Howells /* 1422260a9803SDavid Howells * create a symlink in an AFS filesystem 1423260a9803SDavid Howells */ 1424260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1425260a9803SDavid Howells const char *content) 1426260a9803SDavid Howells { 1427d2ddc776SDavid Howells struct afs_fs_cursor fc; 1428d2ddc776SDavid Howells struct afs_file_status newstatus; 1429d2ddc776SDavid Howells struct afs_vnode *dvnode = AFS_FS_I(dir); 1430d2ddc776SDavid Howells struct afs_fid newfid; 1431260a9803SDavid Howells struct key *key; 1432260a9803SDavid Howells int ret; 1433260a9803SDavid Howells 1434a455589fSAl Viro _enter("{%x:%u},{%pd},%s", 1435a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1436260a9803SDavid Howells content); 1437260a9803SDavid Howells 1438d2ddc776SDavid Howells ret = -ENAMETOOLONG; 1439d2ddc776SDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1440d2ddc776SDavid Howells goto error; 1441d2ddc776SDavid Howells 1442260a9803SDavid Howells ret = -EINVAL; 144345222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1444260a9803SDavid Howells goto error; 1445260a9803SDavid Howells 1446260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1447260a9803SDavid Howells if (IS_ERR(key)) { 1448260a9803SDavid Howells ret = PTR_ERR(key); 1449260a9803SDavid Howells goto error; 1450260a9803SDavid Howells } 1451260a9803SDavid Howells 1452d2ddc776SDavid Howells ret = -ERESTARTSYS; 1453d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, dvnode, key)) { 1454d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1455d2ddc776SDavid Howells fc.cb_break = dvnode->cb_break + dvnode->cb_s_break; 1456d2ddc776SDavid Howells afs_fs_symlink(&fc, dentry->d_name.name, content, 1457d2ddc776SDavid Howells &newfid, &newstatus); 1458d2ddc776SDavid Howells } 1459d2ddc776SDavid Howells 1460d2ddc776SDavid Howells afs_check_for_remote_deletion(&fc, fc.vnode); 1461d2ddc776SDavid Howells afs_vnode_commit_status(&fc, dvnode, fc.cb_break); 1462d2ddc776SDavid Howells afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL); 1463d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1464260a9803SDavid Howells if (ret < 0) 1465d2ddc776SDavid Howells goto error_key; 14664433b691SDavid Howells } else { 14674433b691SDavid Howells goto error_key; 1468260a9803SDavid Howells } 1469260a9803SDavid Howells 1470260a9803SDavid Howells key_put(key); 1471260a9803SDavid Howells _leave(" = 0"); 1472260a9803SDavid Howells return 0; 1473260a9803SDavid Howells 1474d2ddc776SDavid Howells error_key: 1475260a9803SDavid Howells key_put(key); 1476260a9803SDavid Howells error: 1477260a9803SDavid Howells d_drop(dentry); 1478260a9803SDavid Howells _leave(" = %d", ret); 1479260a9803SDavid Howells return ret; 1480260a9803SDavid Howells } 1481260a9803SDavid Howells 1482260a9803SDavid Howells /* 1483260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1484260a9803SDavid Howells */ 1485260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 14861cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 14871cd66c93SMiklos Szeredi unsigned int flags) 1488260a9803SDavid Howells { 1489d2ddc776SDavid Howells struct afs_fs_cursor fc; 1490260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1491260a9803SDavid Howells struct key *key; 1492260a9803SDavid Howells int ret; 1493260a9803SDavid Howells 14941cd66c93SMiklos Szeredi if (flags) 14951cd66c93SMiklos Szeredi return -EINVAL; 14961cd66c93SMiklos Szeredi 14972b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1498260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1499260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1500260a9803SDavid Howells 1501a455589fSAl Viro _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", 1502260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1503260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1504260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1505a455589fSAl Viro new_dentry); 1506260a9803SDavid Howells 1507260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1508260a9803SDavid Howells if (IS_ERR(key)) { 1509260a9803SDavid Howells ret = PTR_ERR(key); 1510260a9803SDavid Howells goto error; 1511260a9803SDavid Howells } 1512260a9803SDavid Howells 1513d2ddc776SDavid Howells ret = -ERESTARTSYS; 1514d2ddc776SDavid Howells if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) { 1515d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) { 1516d2ddc776SDavid Howells if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) { 1517d2ddc776SDavid Howells afs_end_vnode_operation(&fc); 1518bc1527dcSDavid Howells goto error_key; 1519d2ddc776SDavid Howells } 1520d2ddc776SDavid Howells } 1521d2ddc776SDavid Howells while (afs_select_fileserver(&fc)) { 1522d2ddc776SDavid Howells fc.cb_break = orig_dvnode->cb_break + orig_dvnode->cb_s_break; 1523d2ddc776SDavid Howells fc.cb_break_2 = new_dvnode->cb_break + new_dvnode->cb_s_break; 1524d2ddc776SDavid Howells afs_fs_rename(&fc, old_dentry->d_name.name, 1525d2ddc776SDavid Howells new_dvnode, new_dentry->d_name.name); 1526d2ddc776SDavid Howells } 1527d2ddc776SDavid Howells 1528d2ddc776SDavid Howells afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break); 1529d2ddc776SDavid Howells afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2); 1530d2ddc776SDavid Howells if (orig_dvnode != new_dvnode) 1531d2ddc776SDavid Howells mutex_unlock(&new_dvnode->io_lock); 1532d2ddc776SDavid Howells ret = afs_end_vnode_operation(&fc); 1533260a9803SDavid Howells if (ret < 0) 1534d2ddc776SDavid Howells goto error_key; 1535d2ddc776SDavid Howells } 1536d2ddc776SDavid Howells 1537d2ddc776SDavid Howells error_key: 1538260a9803SDavid Howells key_put(key); 1539260a9803SDavid Howells error: 1540260a9803SDavid Howells _leave(" = %d", ret); 1541260a9803SDavid Howells return ret; 1542260a9803SDavid Howells } 1543