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> 201da177e4SLinus Torvalds #include "internal.h" 211da177e4SLinus Torvalds 22260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 231da177e4SLinus Torvalds struct nameidata *nd); 241da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file); 25260a9803SDavid Howells static int afs_readdir(struct file *file, void *dirent, filldir_t filldir); 261da177e4SLinus Torvalds static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd); 27fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry); 28260a9803SDavid Howells static void afs_d_release(struct dentry *dentry); 29260a9803SDavid Howells static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, 30afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 31260a9803SDavid Howells static int afs_create(struct inode *dir, struct dentry *dentry, int mode, 32260a9803SDavid Howells struct nameidata *nd); 33260a9803SDavid Howells static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode); 34260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry); 35260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry); 36260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 37260a9803SDavid Howells struct dentry *dentry); 38260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 39260a9803SDavid Howells const char *content); 40260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 41260a9803SDavid Howells struct inode *new_dir, struct dentry *new_dentry); 421da177e4SLinus Torvalds 434b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 441da177e4SLinus Torvalds .open = afs_dir_open, 4500d3b7a4SDavid Howells .release = afs_release, 46260a9803SDavid Howells .readdir = afs_readdir, 47e8d6c554SDavid Howells .lock = afs_lock, 483222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 491da177e4SLinus Torvalds }; 501da177e4SLinus Torvalds 51754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 52260a9803SDavid Howells .create = afs_create, 53260a9803SDavid Howells .lookup = afs_lookup, 54260a9803SDavid Howells .link = afs_link, 55260a9803SDavid Howells .unlink = afs_unlink, 56260a9803SDavid Howells .symlink = afs_symlink, 57260a9803SDavid Howells .mkdir = afs_mkdir, 58260a9803SDavid Howells .rmdir = afs_rmdir, 59260a9803SDavid Howells .rename = afs_rename, 6000d3b7a4SDavid Howells .permission = afs_permission, 61416351f2SDavid Howells .getattr = afs_getattr, 6231143d5dSDavid Howells .setattr = afs_setattr, 631da177e4SLinus Torvalds }; 641da177e4SLinus Torvalds 6579be57ccSAl Viro static const struct dentry_operations afs_fs_dentry_operations = { 661da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 671da177e4SLinus Torvalds .d_delete = afs_d_delete, 68260a9803SDavid Howells .d_release = afs_d_release, 691da177e4SLinus Torvalds }; 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds #define AFS_DIR_HASHTBL_SIZE 128 721da177e4SLinus Torvalds #define AFS_DIR_DIRENT_SIZE 32 731da177e4SLinus Torvalds #define AFS_DIRENT_PER_BLOCK 64 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds union afs_dirent { 761da177e4SLinus Torvalds struct { 771da177e4SLinus Torvalds uint8_t valid; 781da177e4SLinus Torvalds uint8_t unused[1]; 791da177e4SLinus Torvalds __be16 hash_next; 801da177e4SLinus Torvalds __be32 vnode; 811da177e4SLinus Torvalds __be32 unique; 821da177e4SLinus Torvalds uint8_t name[16]; 831da177e4SLinus Torvalds uint8_t overflow[4]; /* if any char of the name (inc 841da177e4SLinus Torvalds * NUL) reaches here, consume 851da177e4SLinus Torvalds * the next dirent too */ 861da177e4SLinus Torvalds } u; 871da177e4SLinus Torvalds uint8_t extended_name[32]; 881da177e4SLinus Torvalds }; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ 911da177e4SLinus Torvalds struct afs_dir_pagehdr { 921da177e4SLinus Torvalds __be16 npages; 931da177e4SLinus Torvalds __be16 magic; 941da177e4SLinus Torvalds #define AFS_DIR_MAGIC htons(1234) 951da177e4SLinus Torvalds uint8_t nentries; 961da177e4SLinus Torvalds uint8_t bitmap[8]; 971da177e4SLinus Torvalds uint8_t pad[19]; 981da177e4SLinus Torvalds }; 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds /* directory block layout */ 1011da177e4SLinus Torvalds union afs_dir_block { 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds struct { 1061da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1071da177e4SLinus Torvalds uint8_t alloc_ctrs[128]; 1081da177e4SLinus Torvalds /* dir hash table */ 1091da177e4SLinus Torvalds uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; 1101da177e4SLinus Torvalds } hdr; 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; 1131da177e4SLinus Torvalds }; 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds /* layout on a linux VM page */ 1161da177e4SLinus Torvalds struct afs_dir_page { 1171da177e4SLinus Torvalds union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; 1181da177e4SLinus Torvalds }; 1191da177e4SLinus Torvalds 120260a9803SDavid Howells struct afs_lookup_cookie { 1211da177e4SLinus Torvalds struct afs_fid fid; 1221da177e4SLinus Torvalds const char *name; 1231da177e4SLinus Torvalds size_t nlen; 1241da177e4SLinus Torvalds int found; 1251da177e4SLinus Torvalds }; 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds /* 1281da177e4SLinus Torvalds * check that a directory page is valid 1291da177e4SLinus Torvalds */ 1301da177e4SLinus Torvalds static inline void afs_dir_check_page(struct inode *dir, struct page *page) 1311da177e4SLinus Torvalds { 1321da177e4SLinus Torvalds struct afs_dir_page *dbuf; 1331da177e4SLinus Torvalds loff_t latter; 1341da177e4SLinus Torvalds int tmp, qty; 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds #if 0 1371da177e4SLinus Torvalds /* check the page count */ 1381da177e4SLinus Torvalds qty = desc.size / sizeof(dbuf->blocks[0]); 1391da177e4SLinus Torvalds if (qty == 0) 1401da177e4SLinus Torvalds goto error; 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { 1431da177e4SLinus Torvalds printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", 144530b6412SHarvey Harrison __func__, dir->i_ino, qty, 14508e0e7c8SDavid Howells ntohs(dbuf->blocks[0].pagehdr.npages)); 1461da177e4SLinus Torvalds goto error; 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds #endif 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds /* determine how many magic numbers there should be in this page */ 15154b21a79SAndrew Morton latter = dir->i_size - page_offset(page); 1521da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1531da177e4SLinus Torvalds qty = PAGE_SIZE; 1541da177e4SLinus Torvalds else 1551da177e4SLinus Torvalds qty = latter; 1561da177e4SLinus Torvalds qty /= sizeof(union afs_dir_block); 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds /* check them */ 1591da177e4SLinus Torvalds dbuf = page_address(page); 1601da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 1611da177e4SLinus Torvalds if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { 1621da177e4SLinus Torvalds printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n", 163530b6412SHarvey Harrison __func__, dir->i_ino, tmp, qty, 1641da177e4SLinus Torvalds ntohs(dbuf->blocks[tmp].pagehdr.magic)); 1651da177e4SLinus Torvalds goto error; 1661da177e4SLinus Torvalds } 1671da177e4SLinus Torvalds } 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds SetPageChecked(page); 1701da177e4SLinus Torvalds return; 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds error: 1731da177e4SLinus Torvalds SetPageChecked(page); 1741da177e4SLinus Torvalds SetPageError(page); 175ec26815aSDavid Howells } 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds /* 1781da177e4SLinus Torvalds * discard a page cached in the pagecache 1791da177e4SLinus Torvalds */ 1801da177e4SLinus Torvalds static inline void afs_dir_put_page(struct page *page) 1811da177e4SLinus Torvalds { 1821da177e4SLinus Torvalds kunmap(page); 1831da177e4SLinus Torvalds page_cache_release(page); 184ec26815aSDavid Howells } 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds /* 1871da177e4SLinus Torvalds * get a page into the pagecache 1881da177e4SLinus Torvalds */ 18900d3b7a4SDavid Howells static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, 19000d3b7a4SDavid Howells struct key *key) 1911da177e4SLinus Torvalds { 1921da177e4SLinus Torvalds struct page *page; 1931da177e4SLinus Torvalds _enter("{%lu},%lu", dir->i_ino, index); 1941da177e4SLinus Torvalds 195f6d335c0SAl Viro page = read_cache_page(dir->i_mapping, index, afs_page_filler, key); 1961da177e4SLinus Torvalds if (!IS_ERR(page)) { 1971da177e4SLinus Torvalds kmap(page); 1981da177e4SLinus Torvalds if (!PageChecked(page)) 1991da177e4SLinus Torvalds afs_dir_check_page(dir, page); 2001da177e4SLinus Torvalds if (PageError(page)) 2011da177e4SLinus Torvalds goto fail; 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds return page; 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds fail: 2061da177e4SLinus Torvalds afs_dir_put_page(page); 20708e0e7c8SDavid Howells _leave(" = -EIO"); 2081da177e4SLinus Torvalds return ERR_PTR(-EIO); 209ec26815aSDavid Howells } 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds /* 2121da177e4SLinus Torvalds * open an AFS directory file 2131da177e4SLinus Torvalds */ 2141da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 2151da177e4SLinus Torvalds { 2161da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 2171da177e4SLinus Torvalds 2182ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 2192ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 2201da177e4SLinus Torvalds 22108e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2221da177e4SLinus Torvalds return -ENOENT; 2231da177e4SLinus Torvalds 22400d3b7a4SDavid Howells return afs_open(inode, file); 225ec26815aSDavid Howells } 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds /* 2281da177e4SLinus Torvalds * deal with one block in an AFS directory 2291da177e4SLinus Torvalds */ 2301da177e4SLinus Torvalds static int afs_dir_iterate_block(unsigned *fpos, 2311da177e4SLinus Torvalds union afs_dir_block *block, 2321da177e4SLinus Torvalds unsigned blkoff, 2331da177e4SLinus Torvalds void *cookie, 2341da177e4SLinus Torvalds filldir_t filldir) 2351da177e4SLinus Torvalds { 2361da177e4SLinus Torvalds union afs_dirent *dire; 2371da177e4SLinus Torvalds unsigned offset, next, curr; 2381da177e4SLinus Torvalds size_t nlen; 2391da177e4SLinus Torvalds int tmp, ret; 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds _enter("%u,%x,%p,,",*fpos,blkoff,block); 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds curr = (*fpos - blkoff) / sizeof(union afs_dirent); 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 2461da177e4SLinus Torvalds for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; 2471da177e4SLinus Torvalds offset < AFS_DIRENT_PER_BLOCK; 2481da177e4SLinus Torvalds offset = next 2491da177e4SLinus Torvalds ) { 2501da177e4SLinus Torvalds next = offset + 1; 2511da177e4SLinus Torvalds 2521da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 2531da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[offset / 8] & 2541da177e4SLinus Torvalds (1 << (offset % 8)))) { 25508e0e7c8SDavid Howells _debug("ENT[%Zu.%u]: unused", 2561da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset); 2571da177e4SLinus Torvalds if (offset >= curr) 2581da177e4SLinus Torvalds *fpos = blkoff + 2591da177e4SLinus Torvalds next * sizeof(union afs_dirent); 2601da177e4SLinus Torvalds continue; 2611da177e4SLinus Torvalds } 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds /* got a valid entry */ 2641da177e4SLinus Torvalds dire = &block->dirents[offset]; 2651da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 2661da177e4SLinus Torvalds sizeof(*block) - 2671da177e4SLinus Torvalds offset * sizeof(union afs_dirent)); 2681da177e4SLinus Torvalds 26908e0e7c8SDavid Howells _debug("ENT[%Zu.%u]: %s %Zu \"%s\"", 2701da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset, 2711da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 2721da177e4SLinus Torvalds nlen, dire->u.name); 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds /* work out where the next possible entry is */ 2751da177e4SLinus Torvalds for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { 2761da177e4SLinus Torvalds if (next >= AFS_DIRENT_PER_BLOCK) { 2771da177e4SLinus Torvalds _debug("ENT[%Zu.%u]:" 2781da177e4SLinus Torvalds " %u travelled beyond end dir block" 27908e0e7c8SDavid Howells " (len %u/%Zu)", 2801da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 2811da177e4SLinus Torvalds offset, next, tmp, nlen); 2821da177e4SLinus Torvalds return -EIO; 2831da177e4SLinus Torvalds } 2841da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[next / 8] & 2851da177e4SLinus Torvalds (1 << (next % 8)))) { 2861da177e4SLinus Torvalds _debug("ENT[%Zu.%u]:" 28708e0e7c8SDavid Howells " %u unmarked extension (len %u/%Zu)", 2881da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 2891da177e4SLinus Torvalds offset, next, tmp, nlen); 2901da177e4SLinus Torvalds return -EIO; 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds 29308e0e7c8SDavid Howells _debug("ENT[%Zu.%u]: ext %u/%Zu", 2941da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 2951da177e4SLinus Torvalds next, tmp, nlen); 2961da177e4SLinus Torvalds next++; 2971da177e4SLinus Torvalds } 2981da177e4SLinus Torvalds 2991da177e4SLinus Torvalds /* skip if starts before the current position */ 3001da177e4SLinus Torvalds if (offset < curr) 3011da177e4SLinus Torvalds continue; 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds /* found the next entry */ 3041da177e4SLinus Torvalds ret = filldir(cookie, 3051da177e4SLinus Torvalds dire->u.name, 3061da177e4SLinus Torvalds nlen, 3071da177e4SLinus Torvalds blkoff + offset * sizeof(union afs_dirent), 3081da177e4SLinus Torvalds ntohl(dire->u.vnode), 309260a9803SDavid Howells filldir == afs_lookup_filldir ? 3101da177e4SLinus Torvalds ntohl(dire->u.unique) : DT_UNKNOWN); 3111da177e4SLinus Torvalds if (ret < 0) { 3121da177e4SLinus Torvalds _leave(" = 0 [full]"); 3131da177e4SLinus Torvalds return 0; 3141da177e4SLinus Torvalds } 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds *fpos = blkoff + next * sizeof(union afs_dirent); 3171da177e4SLinus Torvalds } 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds _leave(" = 1 [more]"); 3201da177e4SLinus Torvalds return 1; 321ec26815aSDavid Howells } 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds /* 32408e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 3251da177e4SLinus Torvalds */ 3261da177e4SLinus Torvalds static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie, 32700d3b7a4SDavid Howells filldir_t filldir, struct key *key) 3281da177e4SLinus Torvalds { 3291da177e4SLinus Torvalds union afs_dir_block *dblock; 3301da177e4SLinus Torvalds struct afs_dir_page *dbuf; 3311da177e4SLinus Torvalds struct page *page; 3321da177e4SLinus Torvalds unsigned blkoff, limit; 3331da177e4SLinus Torvalds int ret; 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds _enter("{%lu},%u,,", dir->i_ino, *fpos); 3361da177e4SLinus Torvalds 33708e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 3381da177e4SLinus Torvalds _leave(" = -ESTALE"); 3391da177e4SLinus Torvalds return -ESTALE; 3401da177e4SLinus Torvalds } 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 3431da177e4SLinus Torvalds *fpos += sizeof(union afs_dirent) - 1; 3441da177e4SLinus Torvalds *fpos &= ~(sizeof(union afs_dirent) - 1); 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds /* walk through the blocks in sequence */ 3471da177e4SLinus Torvalds ret = 0; 3481da177e4SLinus Torvalds while (*fpos < dir->i_size) { 3491da177e4SLinus Torvalds blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1); 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds /* fetch the appropriate page from the directory */ 35200d3b7a4SDavid Howells page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); 3531da177e4SLinus Torvalds if (IS_ERR(page)) { 3541da177e4SLinus Torvalds ret = PTR_ERR(page); 3551da177e4SLinus Torvalds break; 3561da177e4SLinus Torvalds } 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds dbuf = page_address(page); 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 3631da177e4SLinus Torvalds do { 3641da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 3651da177e4SLinus Torvalds sizeof(union afs_dir_block)]; 3661da177e4SLinus Torvalds ret = afs_dir_iterate_block(fpos, dblock, blkoff, 3671da177e4SLinus Torvalds cookie, filldir); 3681da177e4SLinus Torvalds if (ret != 1) { 3691da177e4SLinus Torvalds afs_dir_put_page(page); 3701da177e4SLinus Torvalds goto out; 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds blkoff += sizeof(union afs_dir_block); 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds } while (*fpos < dir->i_size && blkoff < limit); 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds afs_dir_put_page(page); 3781da177e4SLinus Torvalds ret = 0; 3791da177e4SLinus Torvalds } 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds out: 3821da177e4SLinus Torvalds _leave(" = %d", ret); 3831da177e4SLinus Torvalds return ret; 384ec26815aSDavid Howells } 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds /* 3871da177e4SLinus Torvalds * read an AFS directory 3881da177e4SLinus Torvalds */ 389260a9803SDavid Howells static int afs_readdir(struct file *file, void *cookie, filldir_t filldir) 3901da177e4SLinus Torvalds { 3911da177e4SLinus Torvalds unsigned fpos; 3921da177e4SLinus Torvalds int ret; 3931da177e4SLinus Torvalds 39408e0e7c8SDavid Howells _enter("{%Ld,{%lu}}", 39508e0e7c8SDavid Howells file->f_pos, file->f_path.dentry->d_inode->i_ino); 3961da177e4SLinus Torvalds 39700d3b7a4SDavid Howells ASSERT(file->private_data != NULL); 39800d3b7a4SDavid Howells 3991da177e4SLinus Torvalds fpos = file->f_pos; 40008e0e7c8SDavid Howells ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos, 40100d3b7a4SDavid Howells cookie, filldir, file->private_data); 4021da177e4SLinus Torvalds file->f_pos = fpos; 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds _leave(" = %d", ret); 4051da177e4SLinus Torvalds return ret; 406ec26815aSDavid Howells } 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds /* 4091da177e4SLinus Torvalds * search the directory for a name 4101da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 4111da177e4SLinus Torvalds * uniquifier through dtype 4121da177e4SLinus Torvalds */ 413260a9803SDavid Howells static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, 414afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype) 4151da177e4SLinus Torvalds { 416260a9803SDavid Howells struct afs_lookup_cookie *cookie = _cookie; 4171da177e4SLinus Torvalds 41808e0e7c8SDavid Howells _enter("{%s,%Zu},%s,%u,,%llu,%u", 419ba3e0e1aSDavid S. Miller cookie->name, cookie->nlen, name, nlen, 420ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 4211da177e4SLinus Torvalds 42208e0e7c8SDavid Howells /* insanity checks first */ 42308e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 42408e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 42508e0e7c8SDavid Howells 4261da177e4SLinus Torvalds if (cookie->nlen != nlen || memcmp(cookie->name, name, nlen) != 0) { 4271da177e4SLinus Torvalds _leave(" = 0 [no]"); 4281da177e4SLinus Torvalds return 0; 4291da177e4SLinus Torvalds } 4301da177e4SLinus Torvalds 4311da177e4SLinus Torvalds cookie->fid.vnode = ino; 4321da177e4SLinus Torvalds cookie->fid.unique = dtype; 4331da177e4SLinus Torvalds cookie->found = 1; 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds _leave(" = -1 [found]"); 4361da177e4SLinus Torvalds return -1; 437ec26815aSDavid Howells } 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds /* 44008e0e7c8SDavid Howells * do a lookup in a directory 441260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 4421da177e4SLinus Torvalds */ 44308e0e7c8SDavid Howells static int afs_do_lookup(struct inode *dir, struct dentry *dentry, 44400d3b7a4SDavid Howells struct afs_fid *fid, struct key *key) 4451da177e4SLinus Torvalds { 446260a9803SDavid Howells struct afs_lookup_cookie cookie; 4471da177e4SLinus Torvalds struct afs_super_info *as; 4481da177e4SLinus Torvalds unsigned fpos; 4491da177e4SLinus Torvalds int ret; 4501da177e4SLinus Torvalds 45108e0e7c8SDavid Howells _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name); 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds as = dir->i_sb->s_fs_info; 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds /* search the directory */ 4561da177e4SLinus Torvalds cookie.name = dentry->d_name.name; 4571da177e4SLinus Torvalds cookie.nlen = dentry->d_name.len; 4581da177e4SLinus Torvalds cookie.fid.vid = as->volume->vid; 4591da177e4SLinus Torvalds cookie.found = 0; 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds fpos = 0; 462260a9803SDavid Howells ret = afs_dir_iterate(dir, &fpos, &cookie, afs_lookup_filldir, 46300d3b7a4SDavid Howells key); 4641da177e4SLinus Torvalds if (ret < 0) { 46508e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 46608e0e7c8SDavid Howells return ret; 4671da177e4SLinus Torvalds } 4681da177e4SLinus Torvalds 4691da177e4SLinus Torvalds ret = -ENOENT; 4701da177e4SLinus Torvalds if (!cookie.found) { 47108e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 47208e0e7c8SDavid Howells return -ENOENT; 47308e0e7c8SDavid Howells } 47408e0e7c8SDavid Howells 47508e0e7c8SDavid Howells *fid = cookie.fid; 47608e0e7c8SDavid Howells _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); 47708e0e7c8SDavid Howells return 0; 47808e0e7c8SDavid Howells } 47908e0e7c8SDavid Howells 48008e0e7c8SDavid Howells /* 481bec5eb61Swanglei * Try to auto mount the mountpoint with pseudo directory, if the autocell 482bec5eb61Swanglei * operation is setted. 483bec5eb61Swanglei */ 484bec5eb61Swanglei static struct inode *afs_try_auto_mntpt( 485bec5eb61Swanglei int ret, struct dentry *dentry, struct inode *dir, struct key *key, 486bec5eb61Swanglei struct afs_fid *fid) 487bec5eb61Swanglei { 488bec5eb61Swanglei const char *devname = dentry->d_name.name; 489bec5eb61Swanglei struct afs_vnode *vnode = AFS_FS_I(dir); 490bec5eb61Swanglei struct inode *inode; 491bec5eb61Swanglei 492bec5eb61Swanglei _enter("%d, %p{%s}, {%x:%u}, %p", 493bec5eb61Swanglei ret, dentry, devname, vnode->fid.vid, vnode->fid.vnode, key); 494bec5eb61Swanglei 495bec5eb61Swanglei if (ret != -ENOENT || 496bec5eb61Swanglei !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags)) 497bec5eb61Swanglei goto out; 498bec5eb61Swanglei 499bec5eb61Swanglei inode = afs_iget_autocell(dir, devname, strlen(devname), key); 500bec5eb61Swanglei if (IS_ERR(inode)) { 501bec5eb61Swanglei ret = PTR_ERR(inode); 502bec5eb61Swanglei goto out; 503bec5eb61Swanglei } 504bec5eb61Swanglei 505bec5eb61Swanglei *fid = AFS_FS_I(inode)->fid; 506bec5eb61Swanglei _leave("= %p", inode); 507bec5eb61Swanglei return inode; 508bec5eb61Swanglei 509bec5eb61Swanglei out: 510bec5eb61Swanglei _leave("= %d", ret); 511bec5eb61Swanglei return ERR_PTR(ret); 512bec5eb61Swanglei } 513bec5eb61Swanglei 514bec5eb61Swanglei /* 51508e0e7c8SDavid Howells * look up an entry in a directory 51608e0e7c8SDavid Howells */ 517260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 51808e0e7c8SDavid Howells struct nameidata *nd) 51908e0e7c8SDavid Howells { 52008e0e7c8SDavid Howells struct afs_vnode *vnode; 52108e0e7c8SDavid Howells struct afs_fid fid; 52208e0e7c8SDavid Howells struct inode *inode; 52300d3b7a4SDavid Howells struct key *key; 52408e0e7c8SDavid Howells int ret; 52508e0e7c8SDavid Howells 526260a9803SDavid Howells vnode = AFS_FS_I(dir); 527260a9803SDavid Howells 528416351f2SDavid Howells _enter("{%x:%u},%p{%s},", 529260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name); 530260a9803SDavid Howells 531260a9803SDavid Howells ASSERTCMP(dentry->d_inode, ==, NULL); 53208e0e7c8SDavid Howells 53345222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 53408e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 53508e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 53608e0e7c8SDavid Howells } 53708e0e7c8SDavid Howells 53808e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 53908e0e7c8SDavid Howells _leave(" = -ESTALE"); 54008e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 54108e0e7c8SDavid Howells } 54208e0e7c8SDavid Howells 54300d3b7a4SDavid Howells key = afs_request_key(vnode->volume->cell); 54400d3b7a4SDavid Howells if (IS_ERR(key)) { 54500d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 546e231c2eeSDavid Howells return ERR_CAST(key); 54700d3b7a4SDavid Howells } 54800d3b7a4SDavid Howells 549260a9803SDavid Howells ret = afs_validate(vnode, key); 55008e0e7c8SDavid Howells if (ret < 0) { 55100d3b7a4SDavid Howells key_put(key); 552260a9803SDavid Howells _leave(" = %d [val]", ret); 5531da177e4SLinus Torvalds return ERR_PTR(ret); 5541da177e4SLinus Torvalds } 5551da177e4SLinus Torvalds 556260a9803SDavid Howells ret = afs_do_lookup(dir, dentry, &fid, key); 557260a9803SDavid Howells if (ret < 0) { 558bec5eb61Swanglei inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid); 559bec5eb61Swanglei if (!IS_ERR(inode)) { 560bec5eb61Swanglei key_put(key); 561bec5eb61Swanglei goto success; 562bec5eb61Swanglei } 563bec5eb61Swanglei 564bec5eb61Swanglei ret = PTR_ERR(inode); 565260a9803SDavid Howells key_put(key); 566260a9803SDavid Howells if (ret == -ENOENT) { 567260a9803SDavid Howells d_add(dentry, NULL); 568260a9803SDavid Howells _leave(" = NULL [negative]"); 569260a9803SDavid Howells return NULL; 570260a9803SDavid Howells } 571260a9803SDavid Howells _leave(" = %d [do]", ret); 572260a9803SDavid Howells return ERR_PTR(ret); 573260a9803SDavid Howells } 574260a9803SDavid Howells dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; 575260a9803SDavid Howells 5761da177e4SLinus Torvalds /* instantiate the dentry */ 577260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); 57800d3b7a4SDavid Howells key_put(key); 57908e0e7c8SDavid Howells if (IS_ERR(inode)) { 58008e0e7c8SDavid Howells _leave(" = %ld", PTR_ERR(inode)); 581e231c2eeSDavid Howells return ERR_CAST(inode); 5821da177e4SLinus Torvalds } 5831da177e4SLinus Torvalds 584bec5eb61Swanglei success: 585fb045adbSNick Piggin d_set_d_op(dentry, &afs_fs_dentry_operations); 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds d_add(dentry, inode); 5887a224228SJean Noel Cordenner _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }", 58908e0e7c8SDavid Howells fid.vnode, 59008e0e7c8SDavid Howells fid.unique, 5911da177e4SLinus Torvalds dentry->d_inode->i_ino, 5927a224228SJean Noel Cordenner (unsigned long long)dentry->d_inode->i_version); 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds return NULL; 595ec26815aSDavid Howells } 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds /* 5981da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 5991da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 6001da177e4SLinus Torvalds * inode 6011da177e4SLinus Torvalds */ 6021da177e4SLinus Torvalds static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd) 6031da177e4SLinus Torvalds { 604260a9803SDavid Howells struct afs_vnode *vnode, *dir; 605dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 6061da177e4SLinus Torvalds struct dentry *parent; 60700d3b7a4SDavid Howells struct key *key; 608260a9803SDavid Howells void *dir_version; 6091da177e4SLinus Torvalds int ret; 6101da177e4SLinus Torvalds 61134286d66SNick Piggin if (nd->flags & LOOKUP_RCU) 61234286d66SNick Piggin return -ECHILD; 61334286d66SNick Piggin 61408e0e7c8SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 61508e0e7c8SDavid Howells 616260a9803SDavid Howells if (dentry->d_inode) 617260a9803SDavid Howells _enter("{v={%x:%u} n=%s fl=%lx},", 618260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name, 619260a9803SDavid Howells vnode->flags); 620260a9803SDavid Howells else 621260a9803SDavid Howells _enter("{neg n=%s}", dentry->d_name.name); 6221da177e4SLinus Torvalds 623260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 62400d3b7a4SDavid Howells if (IS_ERR(key)) 62500d3b7a4SDavid Howells key = NULL; 62600d3b7a4SDavid Howells 6271da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 62808e0e7c8SDavid Howells parent = dget_parent(dentry); 629260a9803SDavid Howells if (!parent->d_inode) 6301da177e4SLinus Torvalds goto out_bad; 6311da177e4SLinus Torvalds 632260a9803SDavid Howells dir = AFS_FS_I(parent->d_inode); 6331da177e4SLinus Torvalds 634260a9803SDavid Howells /* validate the parent directory */ 635260a9803SDavid Howells if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) 636260a9803SDavid Howells afs_validate(dir, key); 637260a9803SDavid Howells 638260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 6391da177e4SLinus Torvalds _debug("%s: parent dir deleted", dentry->d_name.name); 6401da177e4SLinus Torvalds goto out_bad; 6411da177e4SLinus Torvalds } 6421da177e4SLinus Torvalds 643260a9803SDavid Howells dir_version = (void *) (unsigned long) dir->status.data_version; 644260a9803SDavid Howells if (dentry->d_fsdata == dir_version) 645260a9803SDavid Howells goto out_valid; /* the dir contents are unchanged */ 646260a9803SDavid Howells 64708e0e7c8SDavid Howells _debug("dir modified"); 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds /* search the directory for this vnode */ 650260a9803SDavid Howells ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); 651260a9803SDavid Howells switch (ret) { 652260a9803SDavid Howells case 0: 653260a9803SDavid Howells /* the filename maps to something */ 654260a9803SDavid Howells if (!dentry->d_inode) 655260a9803SDavid Howells goto out_bad; 656260a9803SDavid Howells if (is_bad_inode(dentry->d_inode)) { 657260a9803SDavid Howells printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n", 658260a9803SDavid Howells parent->d_name.name, dentry->d_name.name); 6591da177e4SLinus Torvalds goto out_bad; 6601da177e4SLinus Torvalds } 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 6631da177e4SLinus Torvalds * different file */ 66408e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 66508e0e7c8SDavid Howells _debug("%s: dirent changed [%u != %u]", 66608e0e7c8SDavid Howells dentry->d_name.name, fid.vnode, 66708e0e7c8SDavid Howells vnode->fid.vnode); 6681da177e4SLinus Torvalds goto not_found; 6691da177e4SLinus Torvalds } 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 672260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 673260a9803SDavid Howells * been reused */ 67408e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 6757a224228SJean Noel Cordenner _debug("%s: file deleted (uq %u -> %u I:%llu)", 67608e0e7c8SDavid Howells dentry->d_name.name, fid.unique, 6777a224228SJean Noel Cordenner vnode->fid.unique, 6787a224228SJean Noel Cordenner (unsigned long long)dentry->d_inode->i_version); 67908e0e7c8SDavid Howells spin_lock(&vnode->lock); 68008e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 68108e0e7c8SDavid Howells spin_unlock(&vnode->lock); 682260a9803SDavid Howells goto not_found; 683260a9803SDavid Howells } 684260a9803SDavid Howells goto out_valid; 685260a9803SDavid Howells 686260a9803SDavid Howells case -ENOENT: 687260a9803SDavid Howells /* the filename is unknown */ 688260a9803SDavid Howells _debug("%s: dirent not found", dentry->d_name.name); 689260a9803SDavid Howells if (dentry->d_inode) 690260a9803SDavid Howells goto not_found; 691260a9803SDavid Howells goto out_valid; 692260a9803SDavid Howells 693260a9803SDavid Howells default: 694260a9803SDavid Howells _debug("failed to iterate dir %s: %d", 695260a9803SDavid Howells parent->d_name.name, ret); 6961da177e4SLinus Torvalds goto out_bad; 6971da177e4SLinus Torvalds } 69808e0e7c8SDavid Howells 6991da177e4SLinus Torvalds out_valid: 700260a9803SDavid Howells dentry->d_fsdata = dir_version; 701260a9803SDavid Howells out_skip: 7021da177e4SLinus Torvalds dput(parent); 70300d3b7a4SDavid Howells key_put(key); 7041da177e4SLinus Torvalds _leave(" = 1 [valid]"); 7051da177e4SLinus Torvalds return 1; 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 7081da177e4SLinus Torvalds not_found: 7091da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 7101da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 7111da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 7121da177e4SLinus Torvalds 7131da177e4SLinus Torvalds out_bad: 714260a9803SDavid Howells if (dentry->d_inode) { 7151da177e4SLinus Torvalds /* don't unhash if we have submounts */ 7161da177e4SLinus Torvalds if (have_submounts(dentry)) 717260a9803SDavid Howells goto out_skip; 7181da177e4SLinus Torvalds } 7191da177e4SLinus Torvalds 7201da177e4SLinus Torvalds _debug("dropping dentry %s/%s", 72108e0e7c8SDavid Howells parent->d_name.name, dentry->d_name.name); 72208e0e7c8SDavid Howells shrink_dcache_parent(dentry); 7231da177e4SLinus Torvalds d_drop(dentry); 7241da177e4SLinus Torvalds dput(parent); 72500d3b7a4SDavid Howells key_put(key); 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds _leave(" = 0 [bad]"); 7281da177e4SLinus Torvalds return 0; 729ec26815aSDavid Howells } 7301da177e4SLinus Torvalds 7311da177e4SLinus Torvalds /* 7321da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 7331da177e4SLinus Torvalds * sleep) 7341da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 7351da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 7361da177e4SLinus Torvalds */ 737fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 7381da177e4SLinus Torvalds { 7391da177e4SLinus Torvalds _enter("%s", dentry->d_name.name); 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 7421da177e4SLinus Torvalds goto zap; 7431da177e4SLinus Torvalds 74408e0e7c8SDavid Howells if (dentry->d_inode && 745bec5eb61Swanglei (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags) || 746bec5eb61Swanglei test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(dentry->d_inode)->flags))) 7471da177e4SLinus Torvalds goto zap; 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds _leave(" = 0 [keep]"); 7501da177e4SLinus Torvalds return 0; 7511da177e4SLinus Torvalds 7521da177e4SLinus Torvalds zap: 7531da177e4SLinus Torvalds _leave(" = 1 [zap]"); 7541da177e4SLinus Torvalds return 1; 755ec26815aSDavid Howells } 756260a9803SDavid Howells 757260a9803SDavid Howells /* 758260a9803SDavid Howells * handle dentry release 759260a9803SDavid Howells */ 760260a9803SDavid Howells static void afs_d_release(struct dentry *dentry) 761260a9803SDavid Howells { 762260a9803SDavid Howells _enter("%s", dentry->d_name.name); 763260a9803SDavid Howells } 764260a9803SDavid Howells 765260a9803SDavid Howells /* 766260a9803SDavid Howells * create a directory on an AFS filesystem 767260a9803SDavid Howells */ 768260a9803SDavid Howells static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 769260a9803SDavid Howells { 770260a9803SDavid Howells struct afs_file_status status; 771260a9803SDavid Howells struct afs_callback cb; 772260a9803SDavid Howells struct afs_server *server; 773260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 774260a9803SDavid Howells struct afs_fid fid; 775260a9803SDavid Howells struct inode *inode; 776260a9803SDavid Howells struct key *key; 777260a9803SDavid Howells int ret; 778260a9803SDavid Howells 779260a9803SDavid Howells dvnode = AFS_FS_I(dir); 780260a9803SDavid Howells 781416351f2SDavid Howells _enter("{%x:%u},{%s},%o", 782260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 783260a9803SDavid Howells 784260a9803SDavid Howells ret = -ENAMETOOLONG; 78545222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 786260a9803SDavid Howells goto error; 787260a9803SDavid Howells 788260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 789260a9803SDavid Howells if (IS_ERR(key)) { 790260a9803SDavid Howells ret = PTR_ERR(key); 791260a9803SDavid Howells goto error; 792260a9803SDavid Howells } 793260a9803SDavid Howells 794260a9803SDavid Howells mode |= S_IFDIR; 795260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 796260a9803SDavid Howells mode, &fid, &status, &cb, &server); 797260a9803SDavid Howells if (ret < 0) 798260a9803SDavid Howells goto mkdir_error; 799260a9803SDavid Howells 800260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 801260a9803SDavid Howells if (IS_ERR(inode)) { 802260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 803260a9803SDavid Howells * directory on the server */ 804260a9803SDavid Howells ret = PTR_ERR(inode); 805260a9803SDavid Howells goto iget_error; 806260a9803SDavid Howells } 807260a9803SDavid Howells 808260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 809260a9803SDavid Howells vnode = AFS_FS_I(inode); 810260a9803SDavid Howells spin_lock(&vnode->lock); 811260a9803SDavid Howells vnode->update_cnt++; 812260a9803SDavid Howells spin_unlock(&vnode->lock); 813260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 814260a9803SDavid Howells afs_put_server(server); 815260a9803SDavid Howells 816260a9803SDavid Howells d_instantiate(dentry, inode); 817260a9803SDavid Howells if (d_unhashed(dentry)) { 818260a9803SDavid Howells _debug("not hashed"); 819260a9803SDavid Howells d_rehash(dentry); 820260a9803SDavid Howells } 821260a9803SDavid Howells key_put(key); 822260a9803SDavid Howells _leave(" = 0"); 823260a9803SDavid Howells return 0; 824260a9803SDavid Howells 825260a9803SDavid Howells iget_error: 826260a9803SDavid Howells afs_put_server(server); 827260a9803SDavid Howells mkdir_error: 828260a9803SDavid Howells key_put(key); 829260a9803SDavid Howells error: 830260a9803SDavid Howells d_drop(dentry); 831260a9803SDavid Howells _leave(" = %d", ret); 832260a9803SDavid Howells return ret; 833260a9803SDavid Howells } 834260a9803SDavid Howells 835260a9803SDavid Howells /* 836260a9803SDavid Howells * remove a directory from an AFS filesystem 837260a9803SDavid Howells */ 838260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 839260a9803SDavid Howells { 840260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 841260a9803SDavid Howells struct key *key; 842260a9803SDavid Howells int ret; 843260a9803SDavid Howells 844260a9803SDavid Howells dvnode = AFS_FS_I(dir); 845260a9803SDavid Howells 846416351f2SDavid Howells _enter("{%x:%u},{%s}", 847260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 848260a9803SDavid Howells 849260a9803SDavid Howells ret = -ENAMETOOLONG; 85045222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 851260a9803SDavid Howells goto error; 852260a9803SDavid Howells 853260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 854260a9803SDavid Howells if (IS_ERR(key)) { 855260a9803SDavid Howells ret = PTR_ERR(key); 856260a9803SDavid Howells goto error; 857260a9803SDavid Howells } 858260a9803SDavid Howells 859260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); 860260a9803SDavid Howells if (ret < 0) 861260a9803SDavid Howells goto rmdir_error; 862260a9803SDavid Howells 863260a9803SDavid Howells if (dentry->d_inode) { 864260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 865260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 866260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 867260a9803SDavid Howells afs_discard_callback_on_delete(vnode); 868260a9803SDavid Howells } 869260a9803SDavid Howells 870260a9803SDavid Howells key_put(key); 871260a9803SDavid Howells _leave(" = 0"); 872260a9803SDavid Howells return 0; 873260a9803SDavid Howells 874260a9803SDavid Howells rmdir_error: 875260a9803SDavid Howells key_put(key); 876260a9803SDavid Howells error: 877260a9803SDavid Howells _leave(" = %d", ret); 878260a9803SDavid Howells return ret; 879260a9803SDavid Howells } 880260a9803SDavid Howells 881260a9803SDavid Howells /* 882260a9803SDavid Howells * remove a file from an AFS filesystem 883260a9803SDavid Howells */ 884260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 885260a9803SDavid Howells { 886260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 887260a9803SDavid Howells struct key *key; 888260a9803SDavid Howells int ret; 889260a9803SDavid Howells 890260a9803SDavid Howells dvnode = AFS_FS_I(dir); 891260a9803SDavid Howells 892416351f2SDavid Howells _enter("{%x:%u},{%s}", 893260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 894260a9803SDavid Howells 895260a9803SDavid Howells ret = -ENAMETOOLONG; 89645222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 897260a9803SDavid Howells goto error; 898260a9803SDavid Howells 899260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 900260a9803SDavid Howells if (IS_ERR(key)) { 901260a9803SDavid Howells ret = PTR_ERR(key); 902260a9803SDavid Howells goto error; 903260a9803SDavid Howells } 904260a9803SDavid Howells 905260a9803SDavid Howells if (dentry->d_inode) { 906260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 907260a9803SDavid Howells 908260a9803SDavid Howells /* make sure we have a callback promise on the victim */ 909260a9803SDavid Howells ret = afs_validate(vnode, key); 910260a9803SDavid Howells if (ret < 0) 911260a9803SDavid Howells goto error; 912260a9803SDavid Howells } 913260a9803SDavid Howells 914260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); 915260a9803SDavid Howells if (ret < 0) 916260a9803SDavid Howells goto remove_error; 917260a9803SDavid Howells 918260a9803SDavid Howells if (dentry->d_inode) { 919260a9803SDavid Howells /* if the file wasn't deleted due to excess hard links, the 920260a9803SDavid Howells * fileserver will break the callback promise on the file - if 921260a9803SDavid Howells * it had one - before it returns to us, and if it was deleted, 922260a9803SDavid Howells * it won't 923260a9803SDavid Howells * 924260a9803SDavid Howells * however, if we didn't have a callback promise outstanding, 925260a9803SDavid Howells * or it was outstanding on a different server, then it won't 926260a9803SDavid Howells * break it either... 927260a9803SDavid Howells */ 928260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 929260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 930260a9803SDavid Howells _debug("AFS_VNODE_DELETED"); 931260a9803SDavid Howells if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) 932260a9803SDavid Howells _debug("AFS_VNODE_CB_BROKEN"); 933260a9803SDavid Howells set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); 934260a9803SDavid Howells ret = afs_validate(vnode, key); 935260a9803SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 936260a9803SDavid Howells } 937260a9803SDavid Howells 938260a9803SDavid Howells key_put(key); 939260a9803SDavid Howells _leave(" = 0"); 940260a9803SDavid Howells return 0; 941260a9803SDavid Howells 942260a9803SDavid Howells remove_error: 943260a9803SDavid Howells key_put(key); 944260a9803SDavid Howells error: 945260a9803SDavid Howells _leave(" = %d", ret); 946260a9803SDavid Howells return ret; 947260a9803SDavid Howells } 948260a9803SDavid Howells 949260a9803SDavid Howells /* 950260a9803SDavid Howells * create a regular file on an AFS filesystem 951260a9803SDavid Howells */ 952260a9803SDavid Howells static int afs_create(struct inode *dir, struct dentry *dentry, int mode, 953260a9803SDavid Howells struct nameidata *nd) 954260a9803SDavid Howells { 955260a9803SDavid Howells struct afs_file_status status; 956260a9803SDavid Howells struct afs_callback cb; 957260a9803SDavid Howells struct afs_server *server; 958260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 959260a9803SDavid Howells struct afs_fid fid; 960260a9803SDavid Howells struct inode *inode; 961260a9803SDavid Howells struct key *key; 962260a9803SDavid Howells int ret; 963260a9803SDavid Howells 964260a9803SDavid Howells dvnode = AFS_FS_I(dir); 965260a9803SDavid Howells 966416351f2SDavid Howells _enter("{%x:%u},{%s},%o,", 967260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 968260a9803SDavid Howells 969260a9803SDavid Howells ret = -ENAMETOOLONG; 97045222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 971260a9803SDavid Howells goto error; 972260a9803SDavid Howells 973260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 974260a9803SDavid Howells if (IS_ERR(key)) { 975260a9803SDavid Howells ret = PTR_ERR(key); 976260a9803SDavid Howells goto error; 977260a9803SDavid Howells } 978260a9803SDavid Howells 979260a9803SDavid Howells mode |= S_IFREG; 980260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 981260a9803SDavid Howells mode, &fid, &status, &cb, &server); 982260a9803SDavid Howells if (ret < 0) 983260a9803SDavid Howells goto create_error; 984260a9803SDavid Howells 985260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 986260a9803SDavid Howells if (IS_ERR(inode)) { 987260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 988260a9803SDavid Howells * directory on the server */ 989260a9803SDavid Howells ret = PTR_ERR(inode); 990260a9803SDavid Howells goto iget_error; 991260a9803SDavid Howells } 992260a9803SDavid Howells 993260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 994260a9803SDavid Howells vnode = AFS_FS_I(inode); 995260a9803SDavid Howells spin_lock(&vnode->lock); 996260a9803SDavid Howells vnode->update_cnt++; 997260a9803SDavid Howells spin_unlock(&vnode->lock); 998260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 999260a9803SDavid Howells afs_put_server(server); 1000260a9803SDavid Howells 1001260a9803SDavid Howells d_instantiate(dentry, inode); 1002260a9803SDavid Howells if (d_unhashed(dentry)) { 1003260a9803SDavid Howells _debug("not hashed"); 1004260a9803SDavid Howells d_rehash(dentry); 1005260a9803SDavid Howells } 1006260a9803SDavid Howells key_put(key); 1007260a9803SDavid Howells _leave(" = 0"); 1008260a9803SDavid Howells return 0; 1009260a9803SDavid Howells 1010260a9803SDavid Howells iget_error: 1011260a9803SDavid Howells afs_put_server(server); 1012260a9803SDavid Howells create_error: 1013260a9803SDavid Howells key_put(key); 1014260a9803SDavid Howells error: 1015260a9803SDavid Howells d_drop(dentry); 1016260a9803SDavid Howells _leave(" = %d", ret); 1017260a9803SDavid Howells return ret; 1018260a9803SDavid Howells } 1019260a9803SDavid Howells 1020260a9803SDavid Howells /* 1021260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1022260a9803SDavid Howells */ 1023260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1024260a9803SDavid Howells struct dentry *dentry) 1025260a9803SDavid Howells { 1026260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1027260a9803SDavid Howells struct key *key; 1028260a9803SDavid Howells int ret; 1029260a9803SDavid Howells 1030260a9803SDavid Howells vnode = AFS_FS_I(from->d_inode); 1031260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1032260a9803SDavid Howells 1033416351f2SDavid Howells _enter("{%x:%u},{%x:%u},{%s}", 1034260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1035260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1036260a9803SDavid Howells dentry->d_name.name); 1037260a9803SDavid Howells 1038260a9803SDavid Howells ret = -ENAMETOOLONG; 103945222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1040260a9803SDavid Howells goto error; 1041260a9803SDavid Howells 1042260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1043260a9803SDavid Howells if (IS_ERR(key)) { 1044260a9803SDavid Howells ret = PTR_ERR(key); 1045260a9803SDavid Howells goto error; 1046260a9803SDavid Howells } 1047260a9803SDavid Howells 1048260a9803SDavid Howells ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); 1049260a9803SDavid Howells if (ret < 0) 1050260a9803SDavid Howells goto link_error; 1051260a9803SDavid Howells 10527de9c6eeSAl Viro ihold(&vnode->vfs_inode); 1053260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1054260a9803SDavid Howells key_put(key); 1055260a9803SDavid Howells _leave(" = 0"); 1056260a9803SDavid Howells return 0; 1057260a9803SDavid Howells 1058260a9803SDavid Howells link_error: 1059260a9803SDavid Howells key_put(key); 1060260a9803SDavid Howells error: 1061260a9803SDavid Howells d_drop(dentry); 1062260a9803SDavid Howells _leave(" = %d", ret); 1063260a9803SDavid Howells return ret; 1064260a9803SDavid Howells } 1065260a9803SDavid Howells 1066260a9803SDavid Howells /* 1067260a9803SDavid Howells * create a symlink in an AFS filesystem 1068260a9803SDavid Howells */ 1069260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1070260a9803SDavid Howells const char *content) 1071260a9803SDavid Howells { 1072260a9803SDavid Howells struct afs_file_status status; 1073260a9803SDavid Howells struct afs_server *server; 1074260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1075260a9803SDavid Howells struct afs_fid fid; 1076260a9803SDavid Howells struct inode *inode; 1077260a9803SDavid Howells struct key *key; 1078260a9803SDavid Howells int ret; 1079260a9803SDavid Howells 1080260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1081260a9803SDavid Howells 1082416351f2SDavid Howells _enter("{%x:%u},{%s},%s", 1083260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, 1084260a9803SDavid Howells content); 1085260a9803SDavid Howells 1086260a9803SDavid Howells ret = -ENAMETOOLONG; 108745222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1088260a9803SDavid Howells goto error; 1089260a9803SDavid Howells 1090260a9803SDavid Howells ret = -EINVAL; 109145222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1092260a9803SDavid Howells goto error; 1093260a9803SDavid Howells 1094260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1095260a9803SDavid Howells if (IS_ERR(key)) { 1096260a9803SDavid Howells ret = PTR_ERR(key); 1097260a9803SDavid Howells goto error; 1098260a9803SDavid Howells } 1099260a9803SDavid Howells 1100260a9803SDavid Howells ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, 1101260a9803SDavid Howells &fid, &status, &server); 1102260a9803SDavid Howells if (ret < 0) 1103260a9803SDavid Howells goto create_error; 1104260a9803SDavid Howells 1105260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); 1106260a9803SDavid Howells if (IS_ERR(inode)) { 1107260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 1108260a9803SDavid Howells * directory on the server */ 1109260a9803SDavid Howells ret = PTR_ERR(inode); 1110260a9803SDavid Howells goto iget_error; 1111260a9803SDavid Howells } 1112260a9803SDavid Howells 1113260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 1114260a9803SDavid Howells vnode = AFS_FS_I(inode); 1115260a9803SDavid Howells spin_lock(&vnode->lock); 1116260a9803SDavid Howells vnode->update_cnt++; 1117260a9803SDavid Howells spin_unlock(&vnode->lock); 1118260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 1119260a9803SDavid Howells afs_put_server(server); 1120260a9803SDavid Howells 1121260a9803SDavid Howells d_instantiate(dentry, inode); 1122260a9803SDavid Howells if (d_unhashed(dentry)) { 1123260a9803SDavid Howells _debug("not hashed"); 1124260a9803SDavid Howells d_rehash(dentry); 1125260a9803SDavid Howells } 1126260a9803SDavid Howells key_put(key); 1127260a9803SDavid Howells _leave(" = 0"); 1128260a9803SDavid Howells return 0; 1129260a9803SDavid Howells 1130260a9803SDavid Howells iget_error: 1131260a9803SDavid Howells afs_put_server(server); 1132260a9803SDavid Howells create_error: 1133260a9803SDavid Howells key_put(key); 1134260a9803SDavid Howells error: 1135260a9803SDavid Howells d_drop(dentry); 1136260a9803SDavid Howells _leave(" = %d", ret); 1137260a9803SDavid Howells return ret; 1138260a9803SDavid Howells } 1139260a9803SDavid Howells 1140260a9803SDavid Howells /* 1141260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1142260a9803SDavid Howells */ 1143260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 1144260a9803SDavid Howells struct inode *new_dir, struct dentry *new_dentry) 1145260a9803SDavid Howells { 1146260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1147260a9803SDavid Howells struct key *key; 1148260a9803SDavid Howells int ret; 1149260a9803SDavid Howells 1150260a9803SDavid Howells vnode = AFS_FS_I(old_dentry->d_inode); 1151260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1152260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1153260a9803SDavid Howells 1154416351f2SDavid Howells _enter("{%x:%u},{%x:%u},{%x:%u},{%s}", 1155260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1156260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1157260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1158260a9803SDavid Howells new_dentry->d_name.name); 1159260a9803SDavid Howells 1160260a9803SDavid Howells ret = -ENAMETOOLONG; 116145222b9eSDavid Howells if (new_dentry->d_name.len >= AFSNAMEMAX) 1162260a9803SDavid Howells goto error; 1163260a9803SDavid Howells 1164260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1165260a9803SDavid Howells if (IS_ERR(key)) { 1166260a9803SDavid Howells ret = PTR_ERR(key); 1167260a9803SDavid Howells goto error; 1168260a9803SDavid Howells } 1169260a9803SDavid Howells 1170260a9803SDavid Howells ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, 1171260a9803SDavid Howells old_dentry->d_name.name, 1172260a9803SDavid Howells new_dentry->d_name.name); 1173260a9803SDavid Howells if (ret < 0) 1174260a9803SDavid Howells goto rename_error; 1175260a9803SDavid Howells key_put(key); 1176260a9803SDavid Howells _leave(" = 0"); 1177260a9803SDavid Howells return 0; 1178260a9803SDavid Howells 1179260a9803SDavid Howells rename_error: 1180260a9803SDavid Howells key_put(key); 1181260a9803SDavid Howells error: 1182260a9803SDavid Howells d_drop(new_dentry); 1183260a9803SDavid Howells _leave(" = %d", ret); 1184260a9803SDavid Howells return ret; 1185260a9803SDavid Howells } 1186