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/slab.h> 161da177e4SLinus Torvalds #include <linux/fs.h> 171da177e4SLinus Torvalds #include <linux/pagemap.h> 1800d3b7a4SDavid Howells #include <linux/ctype.h> 191da177e4SLinus Torvalds #include "internal.h" 201da177e4SLinus Torvalds 21260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 221da177e4SLinus Torvalds struct nameidata *nd); 231da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file); 24260a9803SDavid Howells static int afs_readdir(struct file *file, void *dirent, filldir_t filldir); 251da177e4SLinus Torvalds static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd); 261da177e4SLinus Torvalds static int afs_d_delete(struct dentry *dentry); 27260a9803SDavid Howells static void afs_d_release(struct dentry *dentry); 28260a9803SDavid Howells static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, 29afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 30260a9803SDavid Howells static int afs_create(struct inode *dir, struct dentry *dentry, int mode, 31260a9803SDavid Howells struct nameidata *nd); 32260a9803SDavid Howells static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode); 33260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry); 34260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry); 35260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 36260a9803SDavid Howells struct dentry *dentry); 37260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 38260a9803SDavid Howells const char *content); 39260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 40260a9803SDavid Howells struct inode *new_dir, struct dentry *new_dentry); 411da177e4SLinus Torvalds 424b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 431da177e4SLinus Torvalds .open = afs_dir_open, 4400d3b7a4SDavid Howells .release = afs_release, 45260a9803SDavid Howells .readdir = afs_readdir, 461da177e4SLinus Torvalds }; 471da177e4SLinus Torvalds 48754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 49260a9803SDavid Howells .create = afs_create, 50260a9803SDavid Howells .lookup = afs_lookup, 51260a9803SDavid Howells .link = afs_link, 52260a9803SDavid Howells .unlink = afs_unlink, 53260a9803SDavid Howells .symlink = afs_symlink, 54260a9803SDavid Howells .mkdir = afs_mkdir, 55260a9803SDavid Howells .rmdir = afs_rmdir, 56260a9803SDavid Howells .rename = afs_rename, 5700d3b7a4SDavid Howells .permission = afs_permission, 58416351f2SDavid Howells .getattr = afs_getattr, 591da177e4SLinus Torvalds }; 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds static struct dentry_operations afs_fs_dentry_operations = { 621da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 631da177e4SLinus Torvalds .d_delete = afs_d_delete, 64260a9803SDavid Howells .d_release = afs_d_release, 651da177e4SLinus Torvalds }; 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds #define AFS_DIR_HASHTBL_SIZE 128 681da177e4SLinus Torvalds #define AFS_DIR_DIRENT_SIZE 32 691da177e4SLinus Torvalds #define AFS_DIRENT_PER_BLOCK 64 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds union afs_dirent { 721da177e4SLinus Torvalds struct { 731da177e4SLinus Torvalds uint8_t valid; 741da177e4SLinus Torvalds uint8_t unused[1]; 751da177e4SLinus Torvalds __be16 hash_next; 761da177e4SLinus Torvalds __be32 vnode; 771da177e4SLinus Torvalds __be32 unique; 781da177e4SLinus Torvalds uint8_t name[16]; 791da177e4SLinus Torvalds uint8_t overflow[4]; /* if any char of the name (inc 801da177e4SLinus Torvalds * NUL) reaches here, consume 811da177e4SLinus Torvalds * the next dirent too */ 821da177e4SLinus Torvalds } u; 831da177e4SLinus Torvalds uint8_t extended_name[32]; 841da177e4SLinus Torvalds }; 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ 871da177e4SLinus Torvalds struct afs_dir_pagehdr { 881da177e4SLinus Torvalds __be16 npages; 891da177e4SLinus Torvalds __be16 magic; 901da177e4SLinus Torvalds #define AFS_DIR_MAGIC htons(1234) 911da177e4SLinus Torvalds uint8_t nentries; 921da177e4SLinus Torvalds uint8_t bitmap[8]; 931da177e4SLinus Torvalds uint8_t pad[19]; 941da177e4SLinus Torvalds }; 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds /* directory block layout */ 971da177e4SLinus Torvalds union afs_dir_block { 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds struct { 1021da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1031da177e4SLinus Torvalds uint8_t alloc_ctrs[128]; 1041da177e4SLinus Torvalds /* dir hash table */ 1051da177e4SLinus Torvalds uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; 1061da177e4SLinus Torvalds } hdr; 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; 1091da177e4SLinus Torvalds }; 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds /* layout on a linux VM page */ 1121da177e4SLinus Torvalds struct afs_dir_page { 1131da177e4SLinus Torvalds union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; 1141da177e4SLinus Torvalds }; 1151da177e4SLinus Torvalds 116260a9803SDavid Howells struct afs_lookup_cookie { 1171da177e4SLinus Torvalds struct afs_fid fid; 1181da177e4SLinus Torvalds const char *name; 1191da177e4SLinus Torvalds size_t nlen; 1201da177e4SLinus Torvalds int found; 1211da177e4SLinus Torvalds }; 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds /* 1241da177e4SLinus Torvalds * check that a directory page is valid 1251da177e4SLinus Torvalds */ 1261da177e4SLinus Torvalds static inline void afs_dir_check_page(struct inode *dir, struct page *page) 1271da177e4SLinus Torvalds { 1281da177e4SLinus Torvalds struct afs_dir_page *dbuf; 1291da177e4SLinus Torvalds loff_t latter; 1301da177e4SLinus Torvalds int tmp, qty; 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds #if 0 1331da177e4SLinus Torvalds /* check the page count */ 1341da177e4SLinus Torvalds qty = desc.size / sizeof(dbuf->blocks[0]); 1351da177e4SLinus Torvalds if (qty == 0) 1361da177e4SLinus Torvalds goto error; 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { 1391da177e4SLinus Torvalds printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", 14008e0e7c8SDavid Howells __FUNCTION__, dir->i_ino, qty, 14108e0e7c8SDavid Howells ntohs(dbuf->blocks[0].pagehdr.npages)); 1421da177e4SLinus Torvalds goto error; 1431da177e4SLinus Torvalds } 1441da177e4SLinus Torvalds #endif 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds /* determine how many magic numbers there should be in this page */ 14754b21a79SAndrew Morton latter = dir->i_size - page_offset(page); 1481da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1491da177e4SLinus Torvalds qty = PAGE_SIZE; 1501da177e4SLinus Torvalds else 1511da177e4SLinus Torvalds qty = latter; 1521da177e4SLinus Torvalds qty /= sizeof(union afs_dir_block); 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds /* check them */ 1551da177e4SLinus Torvalds dbuf = page_address(page); 1561da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 1571da177e4SLinus Torvalds if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { 1581da177e4SLinus Torvalds printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n", 1591da177e4SLinus Torvalds __FUNCTION__, dir->i_ino, tmp, qty, 1601da177e4SLinus Torvalds ntohs(dbuf->blocks[tmp].pagehdr.magic)); 1611da177e4SLinus Torvalds goto error; 1621da177e4SLinus Torvalds } 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds SetPageChecked(page); 1661da177e4SLinus Torvalds return; 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds error: 1691da177e4SLinus Torvalds SetPageChecked(page); 1701da177e4SLinus Torvalds SetPageError(page); 171ec26815aSDavid Howells } 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds /* 1741da177e4SLinus Torvalds * discard a page cached in the pagecache 1751da177e4SLinus Torvalds */ 1761da177e4SLinus Torvalds static inline void afs_dir_put_page(struct page *page) 1771da177e4SLinus Torvalds { 1781da177e4SLinus Torvalds kunmap(page); 1791da177e4SLinus Torvalds page_cache_release(page); 180ec26815aSDavid Howells } 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds /* 1831da177e4SLinus Torvalds * get a page into the pagecache 1841da177e4SLinus Torvalds */ 18500d3b7a4SDavid Howells static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, 18600d3b7a4SDavid Howells struct key *key) 1871da177e4SLinus Torvalds { 1881da177e4SLinus Torvalds struct page *page; 18900d3b7a4SDavid Howells struct file file = { 19000d3b7a4SDavid Howells .private_data = key, 19100d3b7a4SDavid Howells }; 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds _enter("{%lu},%lu", dir->i_ino, index); 1941da177e4SLinus Torvalds 19500d3b7a4SDavid Howells page = read_mapping_page(dir->i_mapping, index, &file); 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 /* 48108e0e7c8SDavid Howells * look up an entry in a directory 48208e0e7c8SDavid Howells */ 483260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 48408e0e7c8SDavid Howells struct nameidata *nd) 48508e0e7c8SDavid Howells { 48608e0e7c8SDavid Howells struct afs_vnode *vnode; 48708e0e7c8SDavid Howells struct afs_fid fid; 48808e0e7c8SDavid Howells struct inode *inode; 48900d3b7a4SDavid Howells struct key *key; 49008e0e7c8SDavid Howells int ret; 49108e0e7c8SDavid Howells 492260a9803SDavid Howells vnode = AFS_FS_I(dir); 493260a9803SDavid Howells 494416351f2SDavid Howells _enter("{%x:%u},%p{%s},", 495260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name); 496260a9803SDavid Howells 497260a9803SDavid Howells ASSERTCMP(dentry->d_inode, ==, NULL); 49808e0e7c8SDavid Howells 49908e0e7c8SDavid Howells if (dentry->d_name.len > 255) { 50008e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 50108e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 50208e0e7c8SDavid Howells } 50308e0e7c8SDavid Howells 50408e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 50508e0e7c8SDavid Howells _leave(" = -ESTALE"); 50608e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 50708e0e7c8SDavid Howells } 50808e0e7c8SDavid Howells 50900d3b7a4SDavid Howells key = afs_request_key(vnode->volume->cell); 51000d3b7a4SDavid Howells if (IS_ERR(key)) { 51100d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 51200d3b7a4SDavid Howells return ERR_PTR(PTR_ERR(key)); 51300d3b7a4SDavid Howells } 51400d3b7a4SDavid Howells 515260a9803SDavid Howells ret = afs_validate(vnode, key); 51608e0e7c8SDavid Howells if (ret < 0) { 51700d3b7a4SDavid Howells key_put(key); 518260a9803SDavid Howells _leave(" = %d [val]", ret); 5191da177e4SLinus Torvalds return ERR_PTR(ret); 5201da177e4SLinus Torvalds } 5211da177e4SLinus Torvalds 522260a9803SDavid Howells ret = afs_do_lookup(dir, dentry, &fid, key); 523260a9803SDavid Howells if (ret < 0) { 524260a9803SDavid Howells key_put(key); 525260a9803SDavid Howells if (ret == -ENOENT) { 526260a9803SDavid Howells d_add(dentry, NULL); 527260a9803SDavid Howells _leave(" = NULL [negative]"); 528260a9803SDavid Howells return NULL; 529260a9803SDavid Howells } 530260a9803SDavid Howells _leave(" = %d [do]", ret); 531260a9803SDavid Howells return ERR_PTR(ret); 532260a9803SDavid Howells } 533260a9803SDavid Howells dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; 534260a9803SDavid Howells 5351da177e4SLinus Torvalds /* instantiate the dentry */ 536260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); 53700d3b7a4SDavid Howells key_put(key); 53808e0e7c8SDavid Howells if (IS_ERR(inode)) { 53908e0e7c8SDavid Howells _leave(" = %ld", PTR_ERR(inode)); 54008e0e7c8SDavid Howells return ERR_PTR(PTR_ERR(inode)); 5411da177e4SLinus Torvalds } 5421da177e4SLinus Torvalds 5431da177e4SLinus Torvalds dentry->d_op = &afs_fs_dentry_operations; 5441da177e4SLinus Torvalds 5451da177e4SLinus Torvalds d_add(dentry, inode); 5461da177e4SLinus Torvalds _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%lu }", 54708e0e7c8SDavid Howells fid.vnode, 54808e0e7c8SDavid Howells fid.unique, 5491da177e4SLinus Torvalds dentry->d_inode->i_ino, 5501da177e4SLinus Torvalds dentry->d_inode->i_version); 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds return NULL; 553ec26815aSDavid Howells } 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds /* 5561da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 5571da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 5581da177e4SLinus Torvalds * inode 5591da177e4SLinus Torvalds */ 5601da177e4SLinus Torvalds static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd) 5611da177e4SLinus Torvalds { 562260a9803SDavid Howells struct afs_vnode *vnode, *dir; 56308e0e7c8SDavid Howells struct afs_fid fid; 5641da177e4SLinus Torvalds struct dentry *parent; 56500d3b7a4SDavid Howells struct key *key; 566260a9803SDavid Howells void *dir_version; 5671da177e4SLinus Torvalds int ret; 5681da177e4SLinus Torvalds 56908e0e7c8SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 57008e0e7c8SDavid Howells 571260a9803SDavid Howells if (dentry->d_inode) 572260a9803SDavid Howells _enter("{v={%x:%u} n=%s fl=%lx},", 573260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name, 574260a9803SDavid Howells vnode->flags); 575260a9803SDavid Howells else 576260a9803SDavid Howells _enter("{neg n=%s}", dentry->d_name.name); 5771da177e4SLinus Torvalds 578260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 57900d3b7a4SDavid Howells if (IS_ERR(key)) 58000d3b7a4SDavid Howells key = NULL; 58100d3b7a4SDavid Howells 5821da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 58308e0e7c8SDavid Howells parent = dget_parent(dentry); 584260a9803SDavid Howells if (!parent->d_inode) 5851da177e4SLinus Torvalds goto out_bad; 5861da177e4SLinus Torvalds 587260a9803SDavid Howells dir = AFS_FS_I(parent->d_inode); 5881da177e4SLinus Torvalds 589260a9803SDavid Howells /* validate the parent directory */ 590260a9803SDavid Howells if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) 591260a9803SDavid Howells afs_validate(dir, key); 592260a9803SDavid Howells 593260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 5941da177e4SLinus Torvalds _debug("%s: parent dir deleted", dentry->d_name.name); 5951da177e4SLinus Torvalds goto out_bad; 5961da177e4SLinus Torvalds } 5971da177e4SLinus Torvalds 598260a9803SDavid Howells dir_version = (void *) (unsigned long) dir->status.data_version; 599260a9803SDavid Howells if (dentry->d_fsdata == dir_version) 600260a9803SDavid Howells goto out_valid; /* the dir contents are unchanged */ 601260a9803SDavid Howells 60208e0e7c8SDavid Howells _debug("dir modified"); 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds /* search the directory for this vnode */ 605260a9803SDavid Howells ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); 606260a9803SDavid Howells switch (ret) { 607260a9803SDavid Howells case 0: 608260a9803SDavid Howells /* the filename maps to something */ 609260a9803SDavid Howells if (!dentry->d_inode) 610260a9803SDavid Howells goto out_bad; 611260a9803SDavid Howells if (is_bad_inode(dentry->d_inode)) { 612260a9803SDavid Howells printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n", 613260a9803SDavid Howells parent->d_name.name, dentry->d_name.name); 6141da177e4SLinus Torvalds goto out_bad; 6151da177e4SLinus Torvalds } 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 6181da177e4SLinus Torvalds * different file */ 61908e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 62008e0e7c8SDavid Howells _debug("%s: dirent changed [%u != %u]", 62108e0e7c8SDavid Howells dentry->d_name.name, fid.vnode, 62208e0e7c8SDavid Howells vnode->fid.vnode); 6231da177e4SLinus Torvalds goto not_found; 6241da177e4SLinus Torvalds } 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 627260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 628260a9803SDavid Howells * been reused */ 62908e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 6301da177e4SLinus Torvalds _debug("%s: file deleted (uq %u -> %u I:%lu)", 63108e0e7c8SDavid Howells dentry->d_name.name, fid.unique, 632260a9803SDavid Howells vnode->fid.unique, dentry->d_inode->i_version); 63308e0e7c8SDavid Howells spin_lock(&vnode->lock); 63408e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 63508e0e7c8SDavid Howells spin_unlock(&vnode->lock); 636260a9803SDavid Howells goto not_found; 637260a9803SDavid Howells } 638260a9803SDavid Howells goto out_valid; 639260a9803SDavid Howells 640260a9803SDavid Howells case -ENOENT: 641260a9803SDavid Howells /* the filename is unknown */ 642260a9803SDavid Howells _debug("%s: dirent not found", dentry->d_name.name); 643260a9803SDavid Howells if (dentry->d_inode) 644260a9803SDavid Howells goto not_found; 645260a9803SDavid Howells goto out_valid; 646260a9803SDavid Howells 647260a9803SDavid Howells default: 648260a9803SDavid Howells _debug("failed to iterate dir %s: %d", 649260a9803SDavid Howells parent->d_name.name, ret); 6501da177e4SLinus Torvalds goto out_bad; 6511da177e4SLinus Torvalds } 65208e0e7c8SDavid Howells 6531da177e4SLinus Torvalds out_valid: 654260a9803SDavid Howells dentry->d_fsdata = dir_version; 655260a9803SDavid Howells out_skip: 6561da177e4SLinus Torvalds dput(parent); 65700d3b7a4SDavid Howells key_put(key); 6581da177e4SLinus Torvalds _leave(" = 1 [valid]"); 6591da177e4SLinus Torvalds return 1; 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 6621da177e4SLinus Torvalds not_found: 6631da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 6641da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 6651da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds out_bad: 668260a9803SDavid Howells if (dentry->d_inode) { 6691da177e4SLinus Torvalds /* don't unhash if we have submounts */ 6701da177e4SLinus Torvalds if (have_submounts(dentry)) 671260a9803SDavid Howells goto out_skip; 6721da177e4SLinus Torvalds } 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds _debug("dropping dentry %s/%s", 67508e0e7c8SDavid Howells parent->d_name.name, dentry->d_name.name); 67608e0e7c8SDavid Howells shrink_dcache_parent(dentry); 6771da177e4SLinus Torvalds d_drop(dentry); 6781da177e4SLinus Torvalds dput(parent); 67900d3b7a4SDavid Howells key_put(key); 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds _leave(" = 0 [bad]"); 6821da177e4SLinus Torvalds return 0; 683ec26815aSDavid Howells } 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds /* 6861da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 6871da177e4SLinus Torvalds * sleep) 6881da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 6891da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 6901da177e4SLinus Torvalds */ 6911da177e4SLinus Torvalds static int afs_d_delete(struct dentry *dentry) 6921da177e4SLinus Torvalds { 6931da177e4SLinus Torvalds _enter("%s", dentry->d_name.name); 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 6961da177e4SLinus Torvalds goto zap; 6971da177e4SLinus Torvalds 69808e0e7c8SDavid Howells if (dentry->d_inode && 69908e0e7c8SDavid Howells test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags)) 7001da177e4SLinus Torvalds goto zap; 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds _leave(" = 0 [keep]"); 7031da177e4SLinus Torvalds return 0; 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds zap: 7061da177e4SLinus Torvalds _leave(" = 1 [zap]"); 7071da177e4SLinus Torvalds return 1; 708ec26815aSDavid Howells } 709260a9803SDavid Howells 710260a9803SDavid Howells /* 711260a9803SDavid Howells * handle dentry release 712260a9803SDavid Howells */ 713260a9803SDavid Howells static void afs_d_release(struct dentry *dentry) 714260a9803SDavid Howells { 715260a9803SDavid Howells _enter("%s", dentry->d_name.name); 716260a9803SDavid Howells } 717260a9803SDavid Howells 718260a9803SDavid Howells /* 719260a9803SDavid Howells * create a directory on an AFS filesystem 720260a9803SDavid Howells */ 721260a9803SDavid Howells static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 722260a9803SDavid Howells { 723260a9803SDavid Howells struct afs_file_status status; 724260a9803SDavid Howells struct afs_callback cb; 725260a9803SDavid Howells struct afs_server *server; 726260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 727260a9803SDavid Howells struct afs_fid fid; 728260a9803SDavid Howells struct inode *inode; 729260a9803SDavid Howells struct key *key; 730260a9803SDavid Howells int ret; 731260a9803SDavid Howells 732260a9803SDavid Howells dvnode = AFS_FS_I(dir); 733260a9803SDavid Howells 734416351f2SDavid Howells _enter("{%x:%u},{%s},%o", 735260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 736260a9803SDavid Howells 737260a9803SDavid Howells ret = -ENAMETOOLONG; 738260a9803SDavid Howells if (dentry->d_name.len > 255) 739260a9803SDavid Howells goto error; 740260a9803SDavid Howells 741260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 742260a9803SDavid Howells if (IS_ERR(key)) { 743260a9803SDavid Howells ret = PTR_ERR(key); 744260a9803SDavid Howells goto error; 745260a9803SDavid Howells } 746260a9803SDavid Howells 747260a9803SDavid Howells mode |= S_IFDIR; 748260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 749260a9803SDavid Howells mode, &fid, &status, &cb, &server); 750260a9803SDavid Howells if (ret < 0) 751260a9803SDavid Howells goto mkdir_error; 752260a9803SDavid Howells 753260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 754260a9803SDavid Howells if (IS_ERR(inode)) { 755260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 756260a9803SDavid Howells * directory on the server */ 757260a9803SDavid Howells ret = PTR_ERR(inode); 758260a9803SDavid Howells goto iget_error; 759260a9803SDavid Howells } 760260a9803SDavid Howells 761260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 762260a9803SDavid Howells vnode = AFS_FS_I(inode); 763260a9803SDavid Howells spin_lock(&vnode->lock); 764260a9803SDavid Howells vnode->update_cnt++; 765260a9803SDavid Howells spin_unlock(&vnode->lock); 766260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 767260a9803SDavid Howells afs_put_server(server); 768260a9803SDavid Howells 769260a9803SDavid Howells d_instantiate(dentry, inode); 770260a9803SDavid Howells if (d_unhashed(dentry)) { 771260a9803SDavid Howells _debug("not hashed"); 772260a9803SDavid Howells d_rehash(dentry); 773260a9803SDavid Howells } 774260a9803SDavid Howells key_put(key); 775260a9803SDavid Howells _leave(" = 0"); 776260a9803SDavid Howells return 0; 777260a9803SDavid Howells 778260a9803SDavid Howells iget_error: 779260a9803SDavid Howells afs_put_server(server); 780260a9803SDavid Howells mkdir_error: 781260a9803SDavid Howells key_put(key); 782260a9803SDavid Howells error: 783260a9803SDavid Howells d_drop(dentry); 784260a9803SDavid Howells _leave(" = %d", ret); 785260a9803SDavid Howells return ret; 786260a9803SDavid Howells } 787260a9803SDavid Howells 788260a9803SDavid Howells /* 789260a9803SDavid Howells * remove a directory from an AFS filesystem 790260a9803SDavid Howells */ 791260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 792260a9803SDavid Howells { 793260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 794260a9803SDavid Howells struct key *key; 795260a9803SDavid Howells int ret; 796260a9803SDavid Howells 797260a9803SDavid Howells dvnode = AFS_FS_I(dir); 798260a9803SDavid Howells 799416351f2SDavid Howells _enter("{%x:%u},{%s}", 800260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 801260a9803SDavid Howells 802260a9803SDavid Howells ret = -ENAMETOOLONG; 803260a9803SDavid Howells if (dentry->d_name.len > 255) 804260a9803SDavid Howells goto error; 805260a9803SDavid Howells 806260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 807260a9803SDavid Howells if (IS_ERR(key)) { 808260a9803SDavid Howells ret = PTR_ERR(key); 809260a9803SDavid Howells goto error; 810260a9803SDavid Howells } 811260a9803SDavid Howells 812260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); 813260a9803SDavid Howells if (ret < 0) 814260a9803SDavid Howells goto rmdir_error; 815260a9803SDavid Howells 816260a9803SDavid Howells if (dentry->d_inode) { 817260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 818260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 819260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 820260a9803SDavid Howells afs_discard_callback_on_delete(vnode); 821260a9803SDavid Howells } 822260a9803SDavid Howells 823260a9803SDavid Howells key_put(key); 824260a9803SDavid Howells _leave(" = 0"); 825260a9803SDavid Howells return 0; 826260a9803SDavid Howells 827260a9803SDavid Howells rmdir_error: 828260a9803SDavid Howells key_put(key); 829260a9803SDavid Howells error: 830260a9803SDavid Howells _leave(" = %d", ret); 831260a9803SDavid Howells return ret; 832260a9803SDavid Howells } 833260a9803SDavid Howells 834260a9803SDavid Howells /* 835260a9803SDavid Howells * remove a file from an AFS filesystem 836260a9803SDavid Howells */ 837260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 838260a9803SDavid Howells { 839260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 840260a9803SDavid Howells struct key *key; 841260a9803SDavid Howells int ret; 842260a9803SDavid Howells 843260a9803SDavid Howells dvnode = AFS_FS_I(dir); 844260a9803SDavid Howells 845416351f2SDavid Howells _enter("{%x:%u},{%s}", 846260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 847260a9803SDavid Howells 848260a9803SDavid Howells ret = -ENAMETOOLONG; 849260a9803SDavid Howells if (dentry->d_name.len > 255) 850260a9803SDavid Howells goto error; 851260a9803SDavid Howells 852260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 853260a9803SDavid Howells if (IS_ERR(key)) { 854260a9803SDavid Howells ret = PTR_ERR(key); 855260a9803SDavid Howells goto error; 856260a9803SDavid Howells } 857260a9803SDavid Howells 858260a9803SDavid Howells if (dentry->d_inode) { 859260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 860260a9803SDavid Howells 861260a9803SDavid Howells /* make sure we have a callback promise on the victim */ 862260a9803SDavid Howells ret = afs_validate(vnode, key); 863260a9803SDavid Howells if (ret < 0) 864260a9803SDavid Howells goto error; 865260a9803SDavid Howells } 866260a9803SDavid Howells 867260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); 868260a9803SDavid Howells if (ret < 0) 869260a9803SDavid Howells goto remove_error; 870260a9803SDavid Howells 871260a9803SDavid Howells if (dentry->d_inode) { 872260a9803SDavid Howells /* if the file wasn't deleted due to excess hard links, the 873260a9803SDavid Howells * fileserver will break the callback promise on the file - if 874260a9803SDavid Howells * it had one - before it returns to us, and if it was deleted, 875260a9803SDavid Howells * it won't 876260a9803SDavid Howells * 877260a9803SDavid Howells * however, if we didn't have a callback promise outstanding, 878260a9803SDavid Howells * or it was outstanding on a different server, then it won't 879260a9803SDavid Howells * break it either... 880260a9803SDavid Howells */ 881260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 882260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 883260a9803SDavid Howells _debug("AFS_VNODE_DELETED"); 884260a9803SDavid Howells if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) 885260a9803SDavid Howells _debug("AFS_VNODE_CB_BROKEN"); 886260a9803SDavid Howells set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); 887260a9803SDavid Howells ret = afs_validate(vnode, key); 888260a9803SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 889260a9803SDavid Howells } 890260a9803SDavid Howells 891260a9803SDavid Howells key_put(key); 892260a9803SDavid Howells _leave(" = 0"); 893260a9803SDavid Howells return 0; 894260a9803SDavid Howells 895260a9803SDavid Howells remove_error: 896260a9803SDavid Howells key_put(key); 897260a9803SDavid Howells error: 898260a9803SDavid Howells _leave(" = %d", ret); 899260a9803SDavid Howells return ret; 900260a9803SDavid Howells } 901260a9803SDavid Howells 902260a9803SDavid Howells /* 903260a9803SDavid Howells * create a regular file on an AFS filesystem 904260a9803SDavid Howells */ 905260a9803SDavid Howells static int afs_create(struct inode *dir, struct dentry *dentry, int mode, 906260a9803SDavid Howells struct nameidata *nd) 907260a9803SDavid Howells { 908260a9803SDavid Howells struct afs_file_status status; 909260a9803SDavid Howells struct afs_callback cb; 910260a9803SDavid Howells struct afs_server *server; 911260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 912260a9803SDavid Howells struct afs_fid fid; 913260a9803SDavid Howells struct inode *inode; 914260a9803SDavid Howells struct key *key; 915260a9803SDavid Howells int ret; 916260a9803SDavid Howells 917260a9803SDavid Howells dvnode = AFS_FS_I(dir); 918260a9803SDavid Howells 919416351f2SDavid Howells _enter("{%x:%u},{%s},%o,", 920260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 921260a9803SDavid Howells 922260a9803SDavid Howells ret = -ENAMETOOLONG; 923260a9803SDavid Howells if (dentry->d_name.len > 255) 924260a9803SDavid Howells goto error; 925260a9803SDavid Howells 926260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 927260a9803SDavid Howells if (IS_ERR(key)) { 928260a9803SDavid Howells ret = PTR_ERR(key); 929260a9803SDavid Howells goto error; 930260a9803SDavid Howells } 931260a9803SDavid Howells 932260a9803SDavid Howells mode |= S_IFREG; 933260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 934260a9803SDavid Howells mode, &fid, &status, &cb, &server); 935260a9803SDavid Howells if (ret < 0) 936260a9803SDavid Howells goto create_error; 937260a9803SDavid Howells 938260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 939260a9803SDavid Howells if (IS_ERR(inode)) { 940260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 941260a9803SDavid Howells * directory on the server */ 942260a9803SDavid Howells ret = PTR_ERR(inode); 943260a9803SDavid Howells goto iget_error; 944260a9803SDavid Howells } 945260a9803SDavid Howells 946260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 947260a9803SDavid Howells vnode = AFS_FS_I(inode); 948260a9803SDavid Howells spin_lock(&vnode->lock); 949260a9803SDavid Howells vnode->update_cnt++; 950260a9803SDavid Howells spin_unlock(&vnode->lock); 951260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 952260a9803SDavid Howells afs_put_server(server); 953260a9803SDavid Howells 954260a9803SDavid Howells d_instantiate(dentry, inode); 955260a9803SDavid Howells if (d_unhashed(dentry)) { 956260a9803SDavid Howells _debug("not hashed"); 957260a9803SDavid Howells d_rehash(dentry); 958260a9803SDavid Howells } 959260a9803SDavid Howells key_put(key); 960260a9803SDavid Howells _leave(" = 0"); 961260a9803SDavid Howells return 0; 962260a9803SDavid Howells 963260a9803SDavid Howells iget_error: 964260a9803SDavid Howells afs_put_server(server); 965260a9803SDavid Howells create_error: 966260a9803SDavid Howells key_put(key); 967260a9803SDavid Howells error: 968260a9803SDavid Howells d_drop(dentry); 969260a9803SDavid Howells _leave(" = %d", ret); 970260a9803SDavid Howells return ret; 971260a9803SDavid Howells } 972260a9803SDavid Howells 973260a9803SDavid Howells /* 974260a9803SDavid Howells * create a hard link between files in an AFS filesystem 975260a9803SDavid Howells */ 976260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 977260a9803SDavid Howells struct dentry *dentry) 978260a9803SDavid Howells { 979260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 980260a9803SDavid Howells struct key *key; 981260a9803SDavid Howells int ret; 982260a9803SDavid Howells 983260a9803SDavid Howells vnode = AFS_FS_I(from->d_inode); 984260a9803SDavid Howells dvnode = AFS_FS_I(dir); 985260a9803SDavid Howells 986416351f2SDavid Howells _enter("{%x:%u},{%x:%u},{%s}", 987260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 988260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 989260a9803SDavid Howells dentry->d_name.name); 990260a9803SDavid Howells 991260a9803SDavid Howells ret = -ENAMETOOLONG; 992260a9803SDavid Howells if (dentry->d_name.len > 255) 993260a9803SDavid Howells goto error; 994260a9803SDavid Howells 995260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 996260a9803SDavid Howells if (IS_ERR(key)) { 997260a9803SDavid Howells ret = PTR_ERR(key); 998260a9803SDavid Howells goto error; 999260a9803SDavid Howells } 1000260a9803SDavid Howells 1001260a9803SDavid Howells ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); 1002260a9803SDavid Howells if (ret < 0) 1003260a9803SDavid Howells goto link_error; 1004260a9803SDavid Howells 1005260a9803SDavid Howells atomic_inc(&vnode->vfs_inode.i_count); 1006260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1007260a9803SDavid Howells key_put(key); 1008260a9803SDavid Howells _leave(" = 0"); 1009260a9803SDavid Howells return 0; 1010260a9803SDavid Howells 1011260a9803SDavid Howells link_error: 1012260a9803SDavid Howells key_put(key); 1013260a9803SDavid Howells error: 1014260a9803SDavid Howells d_drop(dentry); 1015260a9803SDavid Howells _leave(" = %d", ret); 1016260a9803SDavid Howells return ret; 1017260a9803SDavid Howells } 1018260a9803SDavid Howells 1019260a9803SDavid Howells /* 1020260a9803SDavid Howells * create a symlink in an AFS filesystem 1021260a9803SDavid Howells */ 1022260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1023260a9803SDavid Howells const char *content) 1024260a9803SDavid Howells { 1025260a9803SDavid Howells struct afs_file_status status; 1026260a9803SDavid Howells struct afs_server *server; 1027260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1028260a9803SDavid Howells struct afs_fid fid; 1029260a9803SDavid Howells struct inode *inode; 1030260a9803SDavid Howells struct key *key; 1031260a9803SDavid Howells int ret; 1032260a9803SDavid Howells 1033260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1034260a9803SDavid Howells 1035416351f2SDavid Howells _enter("{%x:%u},{%s},%s", 1036260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, 1037260a9803SDavid Howells content); 1038260a9803SDavid Howells 1039260a9803SDavid Howells ret = -ENAMETOOLONG; 1040260a9803SDavid Howells if (dentry->d_name.len > 255) 1041260a9803SDavid Howells goto error; 1042260a9803SDavid Howells 1043260a9803SDavid Howells ret = -EINVAL; 1044260a9803SDavid Howells if (strlen(content) > 1023) 1045260a9803SDavid Howells goto error; 1046260a9803SDavid Howells 1047260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1048260a9803SDavid Howells if (IS_ERR(key)) { 1049260a9803SDavid Howells ret = PTR_ERR(key); 1050260a9803SDavid Howells goto error; 1051260a9803SDavid Howells } 1052260a9803SDavid Howells 1053260a9803SDavid Howells ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, 1054260a9803SDavid Howells &fid, &status, &server); 1055260a9803SDavid Howells if (ret < 0) 1056260a9803SDavid Howells goto create_error; 1057260a9803SDavid Howells 1058260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); 1059260a9803SDavid Howells if (IS_ERR(inode)) { 1060260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 1061260a9803SDavid Howells * directory on the server */ 1062260a9803SDavid Howells ret = PTR_ERR(inode); 1063260a9803SDavid Howells goto iget_error; 1064260a9803SDavid Howells } 1065260a9803SDavid Howells 1066260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 1067260a9803SDavid Howells vnode = AFS_FS_I(inode); 1068260a9803SDavid Howells spin_lock(&vnode->lock); 1069260a9803SDavid Howells vnode->update_cnt++; 1070260a9803SDavid Howells spin_unlock(&vnode->lock); 1071260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 1072260a9803SDavid Howells afs_put_server(server); 1073260a9803SDavid Howells 1074260a9803SDavid Howells d_instantiate(dentry, inode); 1075260a9803SDavid Howells if (d_unhashed(dentry)) { 1076260a9803SDavid Howells _debug("not hashed"); 1077260a9803SDavid Howells d_rehash(dentry); 1078260a9803SDavid Howells } 1079260a9803SDavid Howells key_put(key); 1080260a9803SDavid Howells _leave(" = 0"); 1081260a9803SDavid Howells return 0; 1082260a9803SDavid Howells 1083260a9803SDavid Howells iget_error: 1084260a9803SDavid Howells afs_put_server(server); 1085260a9803SDavid Howells create_error: 1086260a9803SDavid Howells key_put(key); 1087260a9803SDavid Howells error: 1088260a9803SDavid Howells d_drop(dentry); 1089260a9803SDavid Howells _leave(" = %d", ret); 1090260a9803SDavid Howells return ret; 1091260a9803SDavid Howells } 1092260a9803SDavid Howells 1093260a9803SDavid Howells /* 1094260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1095260a9803SDavid Howells */ 1096260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 1097260a9803SDavid Howells struct inode *new_dir, struct dentry *new_dentry) 1098260a9803SDavid Howells { 1099260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1100260a9803SDavid Howells struct key *key; 1101260a9803SDavid Howells int ret; 1102260a9803SDavid Howells 1103260a9803SDavid Howells vnode = AFS_FS_I(old_dentry->d_inode); 1104260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1105260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1106260a9803SDavid Howells 1107416351f2SDavid Howells _enter("{%x:%u},{%x:%u},{%x:%u},{%s}", 1108260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1109260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1110260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1111260a9803SDavid Howells new_dentry->d_name.name); 1112260a9803SDavid Howells 1113260a9803SDavid Howells ret = -ENAMETOOLONG; 1114260a9803SDavid Howells if (new_dentry->d_name.len > 255) 1115260a9803SDavid Howells goto error; 1116260a9803SDavid Howells 1117260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1118260a9803SDavid Howells if (IS_ERR(key)) { 1119260a9803SDavid Howells ret = PTR_ERR(key); 1120260a9803SDavid Howells goto error; 1121260a9803SDavid Howells } 1122260a9803SDavid Howells 1123260a9803SDavid Howells ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, 1124260a9803SDavid Howells old_dentry->d_name.name, 1125260a9803SDavid Howells new_dentry->d_name.name); 1126260a9803SDavid Howells if (ret < 0) 1127260a9803SDavid Howells goto rename_error; 1128260a9803SDavid Howells key_put(key); 1129260a9803SDavid Howells _leave(" = 0"); 1130260a9803SDavid Howells return 0; 1131260a9803SDavid Howells 1132260a9803SDavid Howells rename_error: 1133260a9803SDavid Howells key_put(key); 1134260a9803SDavid Howells error: 1135260a9803SDavid Howells d_drop(new_dentry); 1136260a9803SDavid Howells _leave(" = %d", ret); 1137260a9803SDavid Howells return ret; 1138260a9803SDavid Howells } 1139