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> 161da177e4SLinus Torvalds #include <linux/pagemap.h> 1700d3b7a4SDavid Howells #include <linux/ctype.h> 18e8edc6e0SAlexey Dobriyan #include <linux/sched.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); 26fe15ce44SNick Piggin static int afs_d_delete(const 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, 46e8d6c554SDavid Howells .lock = afs_lock, 473222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 481da177e4SLinus Torvalds }; 491da177e4SLinus Torvalds 50754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 51260a9803SDavid Howells .create = afs_create, 52260a9803SDavid Howells .lookup = afs_lookup, 53260a9803SDavid Howells .link = afs_link, 54260a9803SDavid Howells .unlink = afs_unlink, 55260a9803SDavid Howells .symlink = afs_symlink, 56260a9803SDavid Howells .mkdir = afs_mkdir, 57260a9803SDavid Howells .rmdir = afs_rmdir, 58260a9803SDavid Howells .rename = afs_rename, 5900d3b7a4SDavid Howells .permission = afs_permission, 60416351f2SDavid Howells .getattr = afs_getattr, 6131143d5dSDavid Howells .setattr = afs_setattr, 621da177e4SLinus Torvalds }; 631da177e4SLinus Torvalds 6479be57ccSAl Viro static const struct dentry_operations afs_fs_dentry_operations = { 651da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 661da177e4SLinus Torvalds .d_delete = afs_d_delete, 67260a9803SDavid Howells .d_release = afs_d_release, 681da177e4SLinus Torvalds }; 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds #define AFS_DIR_HASHTBL_SIZE 128 711da177e4SLinus Torvalds #define AFS_DIR_DIRENT_SIZE 32 721da177e4SLinus Torvalds #define AFS_DIRENT_PER_BLOCK 64 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds union afs_dirent { 751da177e4SLinus Torvalds struct { 761da177e4SLinus Torvalds uint8_t valid; 771da177e4SLinus Torvalds uint8_t unused[1]; 781da177e4SLinus Torvalds __be16 hash_next; 791da177e4SLinus Torvalds __be32 vnode; 801da177e4SLinus Torvalds __be32 unique; 811da177e4SLinus Torvalds uint8_t name[16]; 821da177e4SLinus Torvalds uint8_t overflow[4]; /* if any char of the name (inc 831da177e4SLinus Torvalds * NUL) reaches here, consume 841da177e4SLinus Torvalds * the next dirent too */ 851da177e4SLinus Torvalds } u; 861da177e4SLinus Torvalds uint8_t extended_name[32]; 871da177e4SLinus Torvalds }; 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ 901da177e4SLinus Torvalds struct afs_dir_pagehdr { 911da177e4SLinus Torvalds __be16 npages; 921da177e4SLinus Torvalds __be16 magic; 931da177e4SLinus Torvalds #define AFS_DIR_MAGIC htons(1234) 941da177e4SLinus Torvalds uint8_t nentries; 951da177e4SLinus Torvalds uint8_t bitmap[8]; 961da177e4SLinus Torvalds uint8_t pad[19]; 971da177e4SLinus Torvalds }; 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds /* directory block layout */ 1001da177e4SLinus Torvalds union afs_dir_block { 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds struct { 1051da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1061da177e4SLinus Torvalds uint8_t alloc_ctrs[128]; 1071da177e4SLinus Torvalds /* dir hash table */ 1081da177e4SLinus Torvalds uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; 1091da177e4SLinus Torvalds } hdr; 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; 1121da177e4SLinus Torvalds }; 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds /* layout on a linux VM page */ 1151da177e4SLinus Torvalds struct afs_dir_page { 1161da177e4SLinus Torvalds union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; 1171da177e4SLinus Torvalds }; 1181da177e4SLinus Torvalds 119260a9803SDavid Howells struct afs_lookup_cookie { 1201da177e4SLinus Torvalds struct afs_fid fid; 1211da177e4SLinus Torvalds const char *name; 1221da177e4SLinus Torvalds size_t nlen; 1231da177e4SLinus Torvalds int found; 1241da177e4SLinus Torvalds }; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds /* 1271da177e4SLinus Torvalds * check that a directory page is valid 1281da177e4SLinus Torvalds */ 1291da177e4SLinus Torvalds static inline void afs_dir_check_page(struct inode *dir, struct page *page) 1301da177e4SLinus Torvalds { 1311da177e4SLinus Torvalds struct afs_dir_page *dbuf; 1321da177e4SLinus Torvalds loff_t latter; 1331da177e4SLinus Torvalds int tmp, qty; 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds #if 0 1361da177e4SLinus Torvalds /* check the page count */ 1371da177e4SLinus Torvalds qty = desc.size / sizeof(dbuf->blocks[0]); 1381da177e4SLinus Torvalds if (qty == 0) 1391da177e4SLinus Torvalds goto error; 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { 1421da177e4SLinus Torvalds printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", 143530b6412SHarvey Harrison __func__, dir->i_ino, qty, 14408e0e7c8SDavid Howells ntohs(dbuf->blocks[0].pagehdr.npages)); 1451da177e4SLinus Torvalds goto error; 1461da177e4SLinus Torvalds } 1471da177e4SLinus Torvalds #endif 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds /* determine how many magic numbers there should be in this page */ 15054b21a79SAndrew Morton latter = dir->i_size - page_offset(page); 1511da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1521da177e4SLinus Torvalds qty = PAGE_SIZE; 1531da177e4SLinus Torvalds else 1541da177e4SLinus Torvalds qty = latter; 1551da177e4SLinus Torvalds qty /= sizeof(union afs_dir_block); 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds /* check them */ 1581da177e4SLinus Torvalds dbuf = page_address(page); 1591da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 1601da177e4SLinus Torvalds if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { 1611da177e4SLinus Torvalds printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n", 162530b6412SHarvey Harrison __func__, dir->i_ino, tmp, qty, 1631da177e4SLinus Torvalds ntohs(dbuf->blocks[tmp].pagehdr.magic)); 1641da177e4SLinus Torvalds goto error; 1651da177e4SLinus Torvalds } 1661da177e4SLinus Torvalds } 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds SetPageChecked(page); 1691da177e4SLinus Torvalds return; 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds error: 1721da177e4SLinus Torvalds SetPageChecked(page); 1731da177e4SLinus Torvalds SetPageError(page); 174ec26815aSDavid Howells } 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds /* 1771da177e4SLinus Torvalds * discard a page cached in the pagecache 1781da177e4SLinus Torvalds */ 1791da177e4SLinus Torvalds static inline void afs_dir_put_page(struct page *page) 1801da177e4SLinus Torvalds { 1811da177e4SLinus Torvalds kunmap(page); 1821da177e4SLinus Torvalds page_cache_release(page); 183ec26815aSDavid Howells } 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds /* 1861da177e4SLinus Torvalds * get a page into the pagecache 1871da177e4SLinus Torvalds */ 18800d3b7a4SDavid Howells static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, 18900d3b7a4SDavid Howells struct key *key) 1901da177e4SLinus Torvalds { 1911da177e4SLinus Torvalds struct page *page; 1921da177e4SLinus Torvalds _enter("{%lu},%lu", dir->i_ino, index); 1931da177e4SLinus Torvalds 194f6d335c0SAl Viro page = read_cache_page(dir->i_mapping, index, afs_page_filler, key); 1951da177e4SLinus Torvalds if (!IS_ERR(page)) { 1961da177e4SLinus Torvalds kmap(page); 1971da177e4SLinus Torvalds if (!PageChecked(page)) 1981da177e4SLinus Torvalds afs_dir_check_page(dir, page); 1991da177e4SLinus Torvalds if (PageError(page)) 2001da177e4SLinus Torvalds goto fail; 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds return page; 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds fail: 2051da177e4SLinus Torvalds afs_dir_put_page(page); 20608e0e7c8SDavid Howells _leave(" = -EIO"); 2071da177e4SLinus Torvalds return ERR_PTR(-EIO); 208ec26815aSDavid Howells } 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds /* 2111da177e4SLinus Torvalds * open an AFS directory file 2121da177e4SLinus Torvalds */ 2131da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 2141da177e4SLinus Torvalds { 2151da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 2161da177e4SLinus Torvalds 2172ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 2182ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 2191da177e4SLinus Torvalds 22008e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2211da177e4SLinus Torvalds return -ENOENT; 2221da177e4SLinus Torvalds 22300d3b7a4SDavid Howells return afs_open(inode, file); 224ec26815aSDavid Howells } 2251da177e4SLinus Torvalds 2261da177e4SLinus Torvalds /* 2271da177e4SLinus Torvalds * deal with one block in an AFS directory 2281da177e4SLinus Torvalds */ 2291da177e4SLinus Torvalds static int afs_dir_iterate_block(unsigned *fpos, 2301da177e4SLinus Torvalds union afs_dir_block *block, 2311da177e4SLinus Torvalds unsigned blkoff, 2321da177e4SLinus Torvalds void *cookie, 2331da177e4SLinus Torvalds filldir_t filldir) 2341da177e4SLinus Torvalds { 2351da177e4SLinus Torvalds union afs_dirent *dire; 2361da177e4SLinus Torvalds unsigned offset, next, curr; 2371da177e4SLinus Torvalds size_t nlen; 2381da177e4SLinus Torvalds int tmp, ret; 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds _enter("%u,%x,%p,,",*fpos,blkoff,block); 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds curr = (*fpos - blkoff) / sizeof(union afs_dirent); 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 2451da177e4SLinus Torvalds for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; 2461da177e4SLinus Torvalds offset < AFS_DIRENT_PER_BLOCK; 2471da177e4SLinus Torvalds offset = next 2481da177e4SLinus Torvalds ) { 2491da177e4SLinus Torvalds next = offset + 1; 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 2521da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[offset / 8] & 2531da177e4SLinus Torvalds (1 << (offset % 8)))) { 25408e0e7c8SDavid Howells _debug("ENT[%Zu.%u]: unused", 2551da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset); 2561da177e4SLinus Torvalds if (offset >= curr) 2571da177e4SLinus Torvalds *fpos = blkoff + 2581da177e4SLinus Torvalds next * sizeof(union afs_dirent); 2591da177e4SLinus Torvalds continue; 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds /* got a valid entry */ 2631da177e4SLinus Torvalds dire = &block->dirents[offset]; 2641da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 2651da177e4SLinus Torvalds sizeof(*block) - 2661da177e4SLinus Torvalds offset * sizeof(union afs_dirent)); 2671da177e4SLinus Torvalds 26808e0e7c8SDavid Howells _debug("ENT[%Zu.%u]: %s %Zu \"%s\"", 2691da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset, 2701da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 2711da177e4SLinus Torvalds nlen, dire->u.name); 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds /* work out where the next possible entry is */ 2741da177e4SLinus Torvalds for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { 2751da177e4SLinus Torvalds if (next >= AFS_DIRENT_PER_BLOCK) { 2761da177e4SLinus Torvalds _debug("ENT[%Zu.%u]:" 2771da177e4SLinus Torvalds " %u travelled beyond end dir block" 27808e0e7c8SDavid Howells " (len %u/%Zu)", 2791da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 2801da177e4SLinus Torvalds offset, next, tmp, nlen); 2811da177e4SLinus Torvalds return -EIO; 2821da177e4SLinus Torvalds } 2831da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[next / 8] & 2841da177e4SLinus Torvalds (1 << (next % 8)))) { 2851da177e4SLinus Torvalds _debug("ENT[%Zu.%u]:" 28608e0e7c8SDavid Howells " %u unmarked extension (len %u/%Zu)", 2871da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 2881da177e4SLinus Torvalds offset, next, tmp, nlen); 2891da177e4SLinus Torvalds return -EIO; 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds 29208e0e7c8SDavid Howells _debug("ENT[%Zu.%u]: ext %u/%Zu", 2931da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 2941da177e4SLinus Torvalds next, tmp, nlen); 2951da177e4SLinus Torvalds next++; 2961da177e4SLinus Torvalds } 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds /* skip if starts before the current position */ 2991da177e4SLinus Torvalds if (offset < curr) 3001da177e4SLinus Torvalds continue; 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds /* found the next entry */ 3031da177e4SLinus Torvalds ret = filldir(cookie, 3041da177e4SLinus Torvalds dire->u.name, 3051da177e4SLinus Torvalds nlen, 3061da177e4SLinus Torvalds blkoff + offset * sizeof(union afs_dirent), 3071da177e4SLinus Torvalds ntohl(dire->u.vnode), 308260a9803SDavid Howells filldir == afs_lookup_filldir ? 3091da177e4SLinus Torvalds ntohl(dire->u.unique) : DT_UNKNOWN); 3101da177e4SLinus Torvalds if (ret < 0) { 3111da177e4SLinus Torvalds _leave(" = 0 [full]"); 3121da177e4SLinus Torvalds return 0; 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds *fpos = blkoff + next * sizeof(union afs_dirent); 3161da177e4SLinus Torvalds } 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds _leave(" = 1 [more]"); 3191da177e4SLinus Torvalds return 1; 320ec26815aSDavid Howells } 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvalds /* 32308e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 3241da177e4SLinus Torvalds */ 3251da177e4SLinus Torvalds static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie, 32600d3b7a4SDavid Howells filldir_t filldir, struct key *key) 3271da177e4SLinus Torvalds { 3281da177e4SLinus Torvalds union afs_dir_block *dblock; 3291da177e4SLinus Torvalds struct afs_dir_page *dbuf; 3301da177e4SLinus Torvalds struct page *page; 3311da177e4SLinus Torvalds unsigned blkoff, limit; 3321da177e4SLinus Torvalds int ret; 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds _enter("{%lu},%u,,", dir->i_ino, *fpos); 3351da177e4SLinus Torvalds 33608e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 3371da177e4SLinus Torvalds _leave(" = -ESTALE"); 3381da177e4SLinus Torvalds return -ESTALE; 3391da177e4SLinus Torvalds } 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 3421da177e4SLinus Torvalds *fpos += sizeof(union afs_dirent) - 1; 3431da177e4SLinus Torvalds *fpos &= ~(sizeof(union afs_dirent) - 1); 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds /* walk through the blocks in sequence */ 3461da177e4SLinus Torvalds ret = 0; 3471da177e4SLinus Torvalds while (*fpos < dir->i_size) { 3481da177e4SLinus Torvalds blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1); 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds /* fetch the appropriate page from the directory */ 35100d3b7a4SDavid Howells page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); 3521da177e4SLinus Torvalds if (IS_ERR(page)) { 3531da177e4SLinus Torvalds ret = PTR_ERR(page); 3541da177e4SLinus Torvalds break; 3551da177e4SLinus Torvalds } 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds dbuf = page_address(page); 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 3621da177e4SLinus Torvalds do { 3631da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 3641da177e4SLinus Torvalds sizeof(union afs_dir_block)]; 3651da177e4SLinus Torvalds ret = afs_dir_iterate_block(fpos, dblock, blkoff, 3661da177e4SLinus Torvalds cookie, filldir); 3671da177e4SLinus Torvalds if (ret != 1) { 3681da177e4SLinus Torvalds afs_dir_put_page(page); 3691da177e4SLinus Torvalds goto out; 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds blkoff += sizeof(union afs_dir_block); 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds } while (*fpos < dir->i_size && blkoff < limit); 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds afs_dir_put_page(page); 3771da177e4SLinus Torvalds ret = 0; 3781da177e4SLinus Torvalds } 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds out: 3811da177e4SLinus Torvalds _leave(" = %d", ret); 3821da177e4SLinus Torvalds return ret; 383ec26815aSDavid Howells } 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds /* 3861da177e4SLinus Torvalds * read an AFS directory 3871da177e4SLinus Torvalds */ 388260a9803SDavid Howells static int afs_readdir(struct file *file, void *cookie, filldir_t filldir) 3891da177e4SLinus Torvalds { 3901da177e4SLinus Torvalds unsigned fpos; 3911da177e4SLinus Torvalds int ret; 3921da177e4SLinus Torvalds 39308e0e7c8SDavid Howells _enter("{%Ld,{%lu}}", 39408e0e7c8SDavid Howells file->f_pos, file->f_path.dentry->d_inode->i_ino); 3951da177e4SLinus Torvalds 39600d3b7a4SDavid Howells ASSERT(file->private_data != NULL); 39700d3b7a4SDavid Howells 3981da177e4SLinus Torvalds fpos = file->f_pos; 39908e0e7c8SDavid Howells ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos, 40000d3b7a4SDavid Howells cookie, filldir, file->private_data); 4011da177e4SLinus Torvalds file->f_pos = fpos; 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds _leave(" = %d", ret); 4041da177e4SLinus Torvalds return ret; 405ec26815aSDavid Howells } 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds /* 4081da177e4SLinus Torvalds * search the directory for a name 4091da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 4101da177e4SLinus Torvalds * uniquifier through dtype 4111da177e4SLinus Torvalds */ 412260a9803SDavid Howells static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, 413afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype) 4141da177e4SLinus Torvalds { 415260a9803SDavid Howells struct afs_lookup_cookie *cookie = _cookie; 4161da177e4SLinus Torvalds 41708e0e7c8SDavid Howells _enter("{%s,%Zu},%s,%u,,%llu,%u", 418ba3e0e1aSDavid S. Miller cookie->name, cookie->nlen, name, nlen, 419ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 4201da177e4SLinus Torvalds 42108e0e7c8SDavid Howells /* insanity checks first */ 42208e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 42308e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 42408e0e7c8SDavid Howells 4251da177e4SLinus Torvalds if (cookie->nlen != nlen || memcmp(cookie->name, name, nlen) != 0) { 4261da177e4SLinus Torvalds _leave(" = 0 [no]"); 4271da177e4SLinus Torvalds return 0; 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds cookie->fid.vnode = ino; 4311da177e4SLinus Torvalds cookie->fid.unique = dtype; 4321da177e4SLinus Torvalds cookie->found = 1; 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds _leave(" = -1 [found]"); 4351da177e4SLinus Torvalds return -1; 436ec26815aSDavid Howells } 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds /* 43908e0e7c8SDavid Howells * do a lookup in a directory 440260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 4411da177e4SLinus Torvalds */ 44208e0e7c8SDavid Howells static int afs_do_lookup(struct inode *dir, struct dentry *dentry, 44300d3b7a4SDavid Howells struct afs_fid *fid, struct key *key) 4441da177e4SLinus Torvalds { 445260a9803SDavid Howells struct afs_lookup_cookie cookie; 4461da177e4SLinus Torvalds struct afs_super_info *as; 4471da177e4SLinus Torvalds unsigned fpos; 4481da177e4SLinus Torvalds int ret; 4491da177e4SLinus Torvalds 45008e0e7c8SDavid Howells _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name); 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds as = dir->i_sb->s_fs_info; 4531da177e4SLinus Torvalds 4541da177e4SLinus Torvalds /* search the directory */ 4551da177e4SLinus Torvalds cookie.name = dentry->d_name.name; 4561da177e4SLinus Torvalds cookie.nlen = dentry->d_name.len; 4571da177e4SLinus Torvalds cookie.fid.vid = as->volume->vid; 4581da177e4SLinus Torvalds cookie.found = 0; 4591da177e4SLinus Torvalds 4601da177e4SLinus Torvalds fpos = 0; 461260a9803SDavid Howells ret = afs_dir_iterate(dir, &fpos, &cookie, afs_lookup_filldir, 46200d3b7a4SDavid Howells key); 4631da177e4SLinus Torvalds if (ret < 0) { 46408e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 46508e0e7c8SDavid Howells return ret; 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds ret = -ENOENT; 4691da177e4SLinus Torvalds if (!cookie.found) { 47008e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 47108e0e7c8SDavid Howells return -ENOENT; 47208e0e7c8SDavid Howells } 47308e0e7c8SDavid Howells 47408e0e7c8SDavid Howells *fid = cookie.fid; 47508e0e7c8SDavid Howells _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); 47608e0e7c8SDavid Howells return 0; 47708e0e7c8SDavid Howells } 47808e0e7c8SDavid Howells 47908e0e7c8SDavid Howells /* 480bec5eb61Swanglei * Try to auto mount the mountpoint with pseudo directory, if the autocell 481bec5eb61Swanglei * operation is setted. 482bec5eb61Swanglei */ 483bec5eb61Swanglei static struct inode *afs_try_auto_mntpt( 484bec5eb61Swanglei int ret, struct dentry *dentry, struct inode *dir, struct key *key, 485bec5eb61Swanglei struct afs_fid *fid) 486bec5eb61Swanglei { 487bec5eb61Swanglei const char *devname = dentry->d_name.name; 488bec5eb61Swanglei struct afs_vnode *vnode = AFS_FS_I(dir); 489bec5eb61Swanglei struct inode *inode; 490bec5eb61Swanglei 491bec5eb61Swanglei _enter("%d, %p{%s}, {%x:%u}, %p", 492bec5eb61Swanglei ret, dentry, devname, vnode->fid.vid, vnode->fid.vnode, key); 493bec5eb61Swanglei 494bec5eb61Swanglei if (ret != -ENOENT || 495bec5eb61Swanglei !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags)) 496bec5eb61Swanglei goto out; 497bec5eb61Swanglei 498bec5eb61Swanglei inode = afs_iget_autocell(dir, devname, strlen(devname), key); 499bec5eb61Swanglei if (IS_ERR(inode)) { 500bec5eb61Swanglei ret = PTR_ERR(inode); 501bec5eb61Swanglei goto out; 502bec5eb61Swanglei } 503bec5eb61Swanglei 504bec5eb61Swanglei *fid = AFS_FS_I(inode)->fid; 505bec5eb61Swanglei _leave("= %p", inode); 506bec5eb61Swanglei return inode; 507bec5eb61Swanglei 508bec5eb61Swanglei out: 509bec5eb61Swanglei _leave("= %d", ret); 510bec5eb61Swanglei return ERR_PTR(ret); 511bec5eb61Swanglei } 512bec5eb61Swanglei 513bec5eb61Swanglei /* 51408e0e7c8SDavid Howells * look up an entry in a directory 51508e0e7c8SDavid Howells */ 516260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 51708e0e7c8SDavid Howells struct nameidata *nd) 51808e0e7c8SDavid Howells { 51908e0e7c8SDavid Howells struct afs_vnode *vnode; 52008e0e7c8SDavid Howells struct afs_fid fid; 52108e0e7c8SDavid Howells struct inode *inode; 52200d3b7a4SDavid Howells struct key *key; 52308e0e7c8SDavid Howells int ret; 52408e0e7c8SDavid Howells 525260a9803SDavid Howells vnode = AFS_FS_I(dir); 526260a9803SDavid Howells 527416351f2SDavid Howells _enter("{%x:%u},%p{%s},", 528260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name); 529260a9803SDavid Howells 530260a9803SDavid Howells ASSERTCMP(dentry->d_inode, ==, NULL); 53108e0e7c8SDavid Howells 53245222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 53308e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 53408e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 53508e0e7c8SDavid Howells } 53608e0e7c8SDavid Howells 53708e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 53808e0e7c8SDavid Howells _leave(" = -ESTALE"); 53908e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 54008e0e7c8SDavid Howells } 54108e0e7c8SDavid Howells 54200d3b7a4SDavid Howells key = afs_request_key(vnode->volume->cell); 54300d3b7a4SDavid Howells if (IS_ERR(key)) { 54400d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 545e231c2eeSDavid Howells return ERR_CAST(key); 54600d3b7a4SDavid Howells } 54700d3b7a4SDavid Howells 548260a9803SDavid Howells ret = afs_validate(vnode, key); 54908e0e7c8SDavid Howells if (ret < 0) { 55000d3b7a4SDavid Howells key_put(key); 551260a9803SDavid Howells _leave(" = %d [val]", ret); 5521da177e4SLinus Torvalds return ERR_PTR(ret); 5531da177e4SLinus Torvalds } 5541da177e4SLinus Torvalds 555260a9803SDavid Howells ret = afs_do_lookup(dir, dentry, &fid, key); 556260a9803SDavid Howells if (ret < 0) { 557bec5eb61Swanglei inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid); 558bec5eb61Swanglei if (!IS_ERR(inode)) { 559bec5eb61Swanglei key_put(key); 560bec5eb61Swanglei goto success; 561bec5eb61Swanglei } 562bec5eb61Swanglei 563bec5eb61Swanglei ret = PTR_ERR(inode); 564260a9803SDavid Howells key_put(key); 565260a9803SDavid Howells if (ret == -ENOENT) { 566260a9803SDavid Howells d_add(dentry, NULL); 567260a9803SDavid Howells _leave(" = NULL [negative]"); 568260a9803SDavid Howells return NULL; 569260a9803SDavid Howells } 570260a9803SDavid Howells _leave(" = %d [do]", ret); 571260a9803SDavid Howells return ERR_PTR(ret); 572260a9803SDavid Howells } 573260a9803SDavid Howells dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; 574260a9803SDavid Howells 5751da177e4SLinus Torvalds /* instantiate the dentry */ 576260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); 57700d3b7a4SDavid Howells key_put(key); 57808e0e7c8SDavid Howells if (IS_ERR(inode)) { 57908e0e7c8SDavid Howells _leave(" = %ld", PTR_ERR(inode)); 580e231c2eeSDavid Howells return ERR_CAST(inode); 5811da177e4SLinus Torvalds } 5821da177e4SLinus Torvalds 583bec5eb61Swanglei success: 5841da177e4SLinus Torvalds dentry->d_op = &afs_fs_dentry_operations; 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds d_add(dentry, inode); 5877a224228SJean Noel Cordenner _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }", 58808e0e7c8SDavid Howells fid.vnode, 58908e0e7c8SDavid Howells fid.unique, 5901da177e4SLinus Torvalds dentry->d_inode->i_ino, 5917a224228SJean Noel Cordenner (unsigned long long)dentry->d_inode->i_version); 5921da177e4SLinus Torvalds 5931da177e4SLinus Torvalds return NULL; 594ec26815aSDavid Howells } 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds /* 5971da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 5981da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 5991da177e4SLinus Torvalds * inode 6001da177e4SLinus Torvalds */ 6011da177e4SLinus Torvalds static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd) 6021da177e4SLinus Torvalds { 603260a9803SDavid Howells struct afs_vnode *vnode, *dir; 604dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 6051da177e4SLinus Torvalds struct dentry *parent; 60600d3b7a4SDavid Howells struct key *key; 607260a9803SDavid Howells void *dir_version; 6081da177e4SLinus Torvalds int ret; 6091da177e4SLinus Torvalds 61008e0e7c8SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 61108e0e7c8SDavid Howells 612260a9803SDavid Howells if (dentry->d_inode) 613260a9803SDavid Howells _enter("{v={%x:%u} n=%s fl=%lx},", 614260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name, 615260a9803SDavid Howells vnode->flags); 616260a9803SDavid Howells else 617260a9803SDavid Howells _enter("{neg n=%s}", dentry->d_name.name); 6181da177e4SLinus Torvalds 619260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 62000d3b7a4SDavid Howells if (IS_ERR(key)) 62100d3b7a4SDavid Howells key = NULL; 62200d3b7a4SDavid Howells 6231da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 62408e0e7c8SDavid Howells parent = dget_parent(dentry); 625260a9803SDavid Howells if (!parent->d_inode) 6261da177e4SLinus Torvalds goto out_bad; 6271da177e4SLinus Torvalds 628260a9803SDavid Howells dir = AFS_FS_I(parent->d_inode); 6291da177e4SLinus Torvalds 630260a9803SDavid Howells /* validate the parent directory */ 631260a9803SDavid Howells if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) 632260a9803SDavid Howells afs_validate(dir, key); 633260a9803SDavid Howells 634260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 6351da177e4SLinus Torvalds _debug("%s: parent dir deleted", dentry->d_name.name); 6361da177e4SLinus Torvalds goto out_bad; 6371da177e4SLinus Torvalds } 6381da177e4SLinus Torvalds 639260a9803SDavid Howells dir_version = (void *) (unsigned long) dir->status.data_version; 640260a9803SDavid Howells if (dentry->d_fsdata == dir_version) 641260a9803SDavid Howells goto out_valid; /* the dir contents are unchanged */ 642260a9803SDavid Howells 64308e0e7c8SDavid Howells _debug("dir modified"); 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds /* search the directory for this vnode */ 646260a9803SDavid Howells ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); 647260a9803SDavid Howells switch (ret) { 648260a9803SDavid Howells case 0: 649260a9803SDavid Howells /* the filename maps to something */ 650260a9803SDavid Howells if (!dentry->d_inode) 651260a9803SDavid Howells goto out_bad; 652260a9803SDavid Howells if (is_bad_inode(dentry->d_inode)) { 653260a9803SDavid Howells printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n", 654260a9803SDavid Howells parent->d_name.name, dentry->d_name.name); 6551da177e4SLinus Torvalds goto out_bad; 6561da177e4SLinus Torvalds } 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 6591da177e4SLinus Torvalds * different file */ 66008e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 66108e0e7c8SDavid Howells _debug("%s: dirent changed [%u != %u]", 66208e0e7c8SDavid Howells dentry->d_name.name, fid.vnode, 66308e0e7c8SDavid Howells vnode->fid.vnode); 6641da177e4SLinus Torvalds goto not_found; 6651da177e4SLinus Torvalds } 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 668260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 669260a9803SDavid Howells * been reused */ 67008e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 6717a224228SJean Noel Cordenner _debug("%s: file deleted (uq %u -> %u I:%llu)", 67208e0e7c8SDavid Howells dentry->d_name.name, fid.unique, 6737a224228SJean Noel Cordenner vnode->fid.unique, 6747a224228SJean Noel Cordenner (unsigned long long)dentry->d_inode->i_version); 67508e0e7c8SDavid Howells spin_lock(&vnode->lock); 67608e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 67708e0e7c8SDavid Howells spin_unlock(&vnode->lock); 678260a9803SDavid Howells goto not_found; 679260a9803SDavid Howells } 680260a9803SDavid Howells goto out_valid; 681260a9803SDavid Howells 682260a9803SDavid Howells case -ENOENT: 683260a9803SDavid Howells /* the filename is unknown */ 684260a9803SDavid Howells _debug("%s: dirent not found", dentry->d_name.name); 685260a9803SDavid Howells if (dentry->d_inode) 686260a9803SDavid Howells goto not_found; 687260a9803SDavid Howells goto out_valid; 688260a9803SDavid Howells 689260a9803SDavid Howells default: 690260a9803SDavid Howells _debug("failed to iterate dir %s: %d", 691260a9803SDavid Howells parent->d_name.name, ret); 6921da177e4SLinus Torvalds goto out_bad; 6931da177e4SLinus Torvalds } 69408e0e7c8SDavid Howells 6951da177e4SLinus Torvalds out_valid: 696260a9803SDavid Howells dentry->d_fsdata = dir_version; 697260a9803SDavid Howells out_skip: 6981da177e4SLinus Torvalds dput(parent); 69900d3b7a4SDavid Howells key_put(key); 7001da177e4SLinus Torvalds _leave(" = 1 [valid]"); 7011da177e4SLinus Torvalds return 1; 7021da177e4SLinus Torvalds 7031da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 7041da177e4SLinus Torvalds not_found: 7051da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 7061da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 7071da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 7081da177e4SLinus Torvalds 7091da177e4SLinus Torvalds out_bad: 710260a9803SDavid Howells if (dentry->d_inode) { 7111da177e4SLinus Torvalds /* don't unhash if we have submounts */ 7121da177e4SLinus Torvalds if (have_submounts(dentry)) 713260a9803SDavid Howells goto out_skip; 7141da177e4SLinus Torvalds } 7151da177e4SLinus Torvalds 7161da177e4SLinus Torvalds _debug("dropping dentry %s/%s", 71708e0e7c8SDavid Howells parent->d_name.name, dentry->d_name.name); 71808e0e7c8SDavid Howells shrink_dcache_parent(dentry); 7191da177e4SLinus Torvalds d_drop(dentry); 7201da177e4SLinus Torvalds dput(parent); 72100d3b7a4SDavid Howells key_put(key); 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds _leave(" = 0 [bad]"); 7241da177e4SLinus Torvalds return 0; 725ec26815aSDavid Howells } 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds /* 7281da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 7291da177e4SLinus Torvalds * sleep) 7301da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 7311da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 7321da177e4SLinus Torvalds */ 733fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 7341da177e4SLinus Torvalds { 7351da177e4SLinus Torvalds _enter("%s", dentry->d_name.name); 7361da177e4SLinus Torvalds 7371da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 7381da177e4SLinus Torvalds goto zap; 7391da177e4SLinus Torvalds 74008e0e7c8SDavid Howells if (dentry->d_inode && 741bec5eb61Swanglei (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags) || 742bec5eb61Swanglei test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(dentry->d_inode)->flags))) 7431da177e4SLinus Torvalds goto zap; 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvalds _leave(" = 0 [keep]"); 7461da177e4SLinus Torvalds return 0; 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds zap: 7491da177e4SLinus Torvalds _leave(" = 1 [zap]"); 7501da177e4SLinus Torvalds return 1; 751ec26815aSDavid Howells } 752260a9803SDavid Howells 753260a9803SDavid Howells /* 754260a9803SDavid Howells * handle dentry release 755260a9803SDavid Howells */ 756260a9803SDavid Howells static void afs_d_release(struct dentry *dentry) 757260a9803SDavid Howells { 758260a9803SDavid Howells _enter("%s", dentry->d_name.name); 759260a9803SDavid Howells } 760260a9803SDavid Howells 761260a9803SDavid Howells /* 762260a9803SDavid Howells * create a directory on an AFS filesystem 763260a9803SDavid Howells */ 764260a9803SDavid Howells static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 765260a9803SDavid Howells { 766260a9803SDavid Howells struct afs_file_status status; 767260a9803SDavid Howells struct afs_callback cb; 768260a9803SDavid Howells struct afs_server *server; 769260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 770260a9803SDavid Howells struct afs_fid fid; 771260a9803SDavid Howells struct inode *inode; 772260a9803SDavid Howells struct key *key; 773260a9803SDavid Howells int ret; 774260a9803SDavid Howells 775260a9803SDavid Howells dvnode = AFS_FS_I(dir); 776260a9803SDavid Howells 777416351f2SDavid Howells _enter("{%x:%u},{%s},%o", 778260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 779260a9803SDavid Howells 780260a9803SDavid Howells ret = -ENAMETOOLONG; 78145222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 782260a9803SDavid Howells goto error; 783260a9803SDavid Howells 784260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 785260a9803SDavid Howells if (IS_ERR(key)) { 786260a9803SDavid Howells ret = PTR_ERR(key); 787260a9803SDavid Howells goto error; 788260a9803SDavid Howells } 789260a9803SDavid Howells 790260a9803SDavid Howells mode |= S_IFDIR; 791260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 792260a9803SDavid Howells mode, &fid, &status, &cb, &server); 793260a9803SDavid Howells if (ret < 0) 794260a9803SDavid Howells goto mkdir_error; 795260a9803SDavid Howells 796260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 797260a9803SDavid Howells if (IS_ERR(inode)) { 798260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 799260a9803SDavid Howells * directory on the server */ 800260a9803SDavid Howells ret = PTR_ERR(inode); 801260a9803SDavid Howells goto iget_error; 802260a9803SDavid Howells } 803260a9803SDavid Howells 804260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 805260a9803SDavid Howells vnode = AFS_FS_I(inode); 806260a9803SDavid Howells spin_lock(&vnode->lock); 807260a9803SDavid Howells vnode->update_cnt++; 808260a9803SDavid Howells spin_unlock(&vnode->lock); 809260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 810260a9803SDavid Howells afs_put_server(server); 811260a9803SDavid Howells 812260a9803SDavid Howells d_instantiate(dentry, inode); 813260a9803SDavid Howells if (d_unhashed(dentry)) { 814260a9803SDavid Howells _debug("not hashed"); 815260a9803SDavid Howells d_rehash(dentry); 816260a9803SDavid Howells } 817260a9803SDavid Howells key_put(key); 818260a9803SDavid Howells _leave(" = 0"); 819260a9803SDavid Howells return 0; 820260a9803SDavid Howells 821260a9803SDavid Howells iget_error: 822260a9803SDavid Howells afs_put_server(server); 823260a9803SDavid Howells mkdir_error: 824260a9803SDavid Howells key_put(key); 825260a9803SDavid Howells error: 826260a9803SDavid Howells d_drop(dentry); 827260a9803SDavid Howells _leave(" = %d", ret); 828260a9803SDavid Howells return ret; 829260a9803SDavid Howells } 830260a9803SDavid Howells 831260a9803SDavid Howells /* 832260a9803SDavid Howells * remove a directory from an AFS filesystem 833260a9803SDavid Howells */ 834260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 835260a9803SDavid Howells { 836260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 837260a9803SDavid Howells struct key *key; 838260a9803SDavid Howells int ret; 839260a9803SDavid Howells 840260a9803SDavid Howells dvnode = AFS_FS_I(dir); 841260a9803SDavid Howells 842416351f2SDavid Howells _enter("{%x:%u},{%s}", 843260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 844260a9803SDavid Howells 845260a9803SDavid Howells ret = -ENAMETOOLONG; 84645222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 847260a9803SDavid Howells goto error; 848260a9803SDavid Howells 849260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 850260a9803SDavid Howells if (IS_ERR(key)) { 851260a9803SDavid Howells ret = PTR_ERR(key); 852260a9803SDavid Howells goto error; 853260a9803SDavid Howells } 854260a9803SDavid Howells 855260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); 856260a9803SDavid Howells if (ret < 0) 857260a9803SDavid Howells goto rmdir_error; 858260a9803SDavid Howells 859260a9803SDavid Howells if (dentry->d_inode) { 860260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 861260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 862260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 863260a9803SDavid Howells afs_discard_callback_on_delete(vnode); 864260a9803SDavid Howells } 865260a9803SDavid Howells 866260a9803SDavid Howells key_put(key); 867260a9803SDavid Howells _leave(" = 0"); 868260a9803SDavid Howells return 0; 869260a9803SDavid Howells 870260a9803SDavid Howells rmdir_error: 871260a9803SDavid Howells key_put(key); 872260a9803SDavid Howells error: 873260a9803SDavid Howells _leave(" = %d", ret); 874260a9803SDavid Howells return ret; 875260a9803SDavid Howells } 876260a9803SDavid Howells 877260a9803SDavid Howells /* 878260a9803SDavid Howells * remove a file from an AFS filesystem 879260a9803SDavid Howells */ 880260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 881260a9803SDavid Howells { 882260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 883260a9803SDavid Howells struct key *key; 884260a9803SDavid Howells int ret; 885260a9803SDavid Howells 886260a9803SDavid Howells dvnode = AFS_FS_I(dir); 887260a9803SDavid Howells 888416351f2SDavid Howells _enter("{%x:%u},{%s}", 889260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 890260a9803SDavid Howells 891260a9803SDavid Howells ret = -ENAMETOOLONG; 89245222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 893260a9803SDavid Howells goto error; 894260a9803SDavid Howells 895260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 896260a9803SDavid Howells if (IS_ERR(key)) { 897260a9803SDavid Howells ret = PTR_ERR(key); 898260a9803SDavid Howells goto error; 899260a9803SDavid Howells } 900260a9803SDavid Howells 901260a9803SDavid Howells if (dentry->d_inode) { 902260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 903260a9803SDavid Howells 904260a9803SDavid Howells /* make sure we have a callback promise on the victim */ 905260a9803SDavid Howells ret = afs_validate(vnode, key); 906260a9803SDavid Howells if (ret < 0) 907260a9803SDavid Howells goto error; 908260a9803SDavid Howells } 909260a9803SDavid Howells 910260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); 911260a9803SDavid Howells if (ret < 0) 912260a9803SDavid Howells goto remove_error; 913260a9803SDavid Howells 914260a9803SDavid Howells if (dentry->d_inode) { 915260a9803SDavid Howells /* if the file wasn't deleted due to excess hard links, the 916260a9803SDavid Howells * fileserver will break the callback promise on the file - if 917260a9803SDavid Howells * it had one - before it returns to us, and if it was deleted, 918260a9803SDavid Howells * it won't 919260a9803SDavid Howells * 920260a9803SDavid Howells * however, if we didn't have a callback promise outstanding, 921260a9803SDavid Howells * or it was outstanding on a different server, then it won't 922260a9803SDavid Howells * break it either... 923260a9803SDavid Howells */ 924260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 925260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 926260a9803SDavid Howells _debug("AFS_VNODE_DELETED"); 927260a9803SDavid Howells if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) 928260a9803SDavid Howells _debug("AFS_VNODE_CB_BROKEN"); 929260a9803SDavid Howells set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); 930260a9803SDavid Howells ret = afs_validate(vnode, key); 931260a9803SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 932260a9803SDavid Howells } 933260a9803SDavid Howells 934260a9803SDavid Howells key_put(key); 935260a9803SDavid Howells _leave(" = 0"); 936260a9803SDavid Howells return 0; 937260a9803SDavid Howells 938260a9803SDavid Howells remove_error: 939260a9803SDavid Howells key_put(key); 940260a9803SDavid Howells error: 941260a9803SDavid Howells _leave(" = %d", ret); 942260a9803SDavid Howells return ret; 943260a9803SDavid Howells } 944260a9803SDavid Howells 945260a9803SDavid Howells /* 946260a9803SDavid Howells * create a regular file on an AFS filesystem 947260a9803SDavid Howells */ 948260a9803SDavid Howells static int afs_create(struct inode *dir, struct dentry *dentry, int mode, 949260a9803SDavid Howells struct nameidata *nd) 950260a9803SDavid Howells { 951260a9803SDavid Howells struct afs_file_status status; 952260a9803SDavid Howells struct afs_callback cb; 953260a9803SDavid Howells struct afs_server *server; 954260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 955260a9803SDavid Howells struct afs_fid fid; 956260a9803SDavid Howells struct inode *inode; 957260a9803SDavid Howells struct key *key; 958260a9803SDavid Howells int ret; 959260a9803SDavid Howells 960260a9803SDavid Howells dvnode = AFS_FS_I(dir); 961260a9803SDavid Howells 962416351f2SDavid Howells _enter("{%x:%u},{%s},%o,", 963260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 964260a9803SDavid Howells 965260a9803SDavid Howells ret = -ENAMETOOLONG; 96645222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 967260a9803SDavid Howells goto error; 968260a9803SDavid Howells 969260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 970260a9803SDavid Howells if (IS_ERR(key)) { 971260a9803SDavid Howells ret = PTR_ERR(key); 972260a9803SDavid Howells goto error; 973260a9803SDavid Howells } 974260a9803SDavid Howells 975260a9803SDavid Howells mode |= S_IFREG; 976260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 977260a9803SDavid Howells mode, &fid, &status, &cb, &server); 978260a9803SDavid Howells if (ret < 0) 979260a9803SDavid Howells goto create_error; 980260a9803SDavid Howells 981260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 982260a9803SDavid Howells if (IS_ERR(inode)) { 983260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 984260a9803SDavid Howells * directory on the server */ 985260a9803SDavid Howells ret = PTR_ERR(inode); 986260a9803SDavid Howells goto iget_error; 987260a9803SDavid Howells } 988260a9803SDavid Howells 989260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 990260a9803SDavid Howells vnode = AFS_FS_I(inode); 991260a9803SDavid Howells spin_lock(&vnode->lock); 992260a9803SDavid Howells vnode->update_cnt++; 993260a9803SDavid Howells spin_unlock(&vnode->lock); 994260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 995260a9803SDavid Howells afs_put_server(server); 996260a9803SDavid Howells 997260a9803SDavid Howells d_instantiate(dentry, inode); 998260a9803SDavid Howells if (d_unhashed(dentry)) { 999260a9803SDavid Howells _debug("not hashed"); 1000260a9803SDavid Howells d_rehash(dentry); 1001260a9803SDavid Howells } 1002260a9803SDavid Howells key_put(key); 1003260a9803SDavid Howells _leave(" = 0"); 1004260a9803SDavid Howells return 0; 1005260a9803SDavid Howells 1006260a9803SDavid Howells iget_error: 1007260a9803SDavid Howells afs_put_server(server); 1008260a9803SDavid Howells create_error: 1009260a9803SDavid Howells key_put(key); 1010260a9803SDavid Howells error: 1011260a9803SDavid Howells d_drop(dentry); 1012260a9803SDavid Howells _leave(" = %d", ret); 1013260a9803SDavid Howells return ret; 1014260a9803SDavid Howells } 1015260a9803SDavid Howells 1016260a9803SDavid Howells /* 1017260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1018260a9803SDavid Howells */ 1019260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1020260a9803SDavid Howells struct dentry *dentry) 1021260a9803SDavid Howells { 1022260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1023260a9803SDavid Howells struct key *key; 1024260a9803SDavid Howells int ret; 1025260a9803SDavid Howells 1026260a9803SDavid Howells vnode = AFS_FS_I(from->d_inode); 1027260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1028260a9803SDavid Howells 1029416351f2SDavid Howells _enter("{%x:%u},{%x:%u},{%s}", 1030260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1031260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1032260a9803SDavid Howells dentry->d_name.name); 1033260a9803SDavid Howells 1034260a9803SDavid Howells ret = -ENAMETOOLONG; 103545222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1036260a9803SDavid Howells goto error; 1037260a9803SDavid Howells 1038260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1039260a9803SDavid Howells if (IS_ERR(key)) { 1040260a9803SDavid Howells ret = PTR_ERR(key); 1041260a9803SDavid Howells goto error; 1042260a9803SDavid Howells } 1043260a9803SDavid Howells 1044260a9803SDavid Howells ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); 1045260a9803SDavid Howells if (ret < 0) 1046260a9803SDavid Howells goto link_error; 1047260a9803SDavid Howells 10487de9c6eeSAl Viro ihold(&vnode->vfs_inode); 1049260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1050260a9803SDavid Howells key_put(key); 1051260a9803SDavid Howells _leave(" = 0"); 1052260a9803SDavid Howells return 0; 1053260a9803SDavid Howells 1054260a9803SDavid Howells link_error: 1055260a9803SDavid Howells key_put(key); 1056260a9803SDavid Howells error: 1057260a9803SDavid Howells d_drop(dentry); 1058260a9803SDavid Howells _leave(" = %d", ret); 1059260a9803SDavid Howells return ret; 1060260a9803SDavid Howells } 1061260a9803SDavid Howells 1062260a9803SDavid Howells /* 1063260a9803SDavid Howells * create a symlink in an AFS filesystem 1064260a9803SDavid Howells */ 1065260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1066260a9803SDavid Howells const char *content) 1067260a9803SDavid Howells { 1068260a9803SDavid Howells struct afs_file_status status; 1069260a9803SDavid Howells struct afs_server *server; 1070260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1071260a9803SDavid Howells struct afs_fid fid; 1072260a9803SDavid Howells struct inode *inode; 1073260a9803SDavid Howells struct key *key; 1074260a9803SDavid Howells int ret; 1075260a9803SDavid Howells 1076260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1077260a9803SDavid Howells 1078416351f2SDavid Howells _enter("{%x:%u},{%s},%s", 1079260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, 1080260a9803SDavid Howells content); 1081260a9803SDavid Howells 1082260a9803SDavid Howells ret = -ENAMETOOLONG; 108345222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1084260a9803SDavid Howells goto error; 1085260a9803SDavid Howells 1086260a9803SDavid Howells ret = -EINVAL; 108745222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1088260a9803SDavid Howells goto error; 1089260a9803SDavid Howells 1090260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1091260a9803SDavid Howells if (IS_ERR(key)) { 1092260a9803SDavid Howells ret = PTR_ERR(key); 1093260a9803SDavid Howells goto error; 1094260a9803SDavid Howells } 1095260a9803SDavid Howells 1096260a9803SDavid Howells ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, 1097260a9803SDavid Howells &fid, &status, &server); 1098260a9803SDavid Howells if (ret < 0) 1099260a9803SDavid Howells goto create_error; 1100260a9803SDavid Howells 1101260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); 1102260a9803SDavid Howells if (IS_ERR(inode)) { 1103260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 1104260a9803SDavid Howells * directory on the server */ 1105260a9803SDavid Howells ret = PTR_ERR(inode); 1106260a9803SDavid Howells goto iget_error; 1107260a9803SDavid Howells } 1108260a9803SDavid Howells 1109260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 1110260a9803SDavid Howells vnode = AFS_FS_I(inode); 1111260a9803SDavid Howells spin_lock(&vnode->lock); 1112260a9803SDavid Howells vnode->update_cnt++; 1113260a9803SDavid Howells spin_unlock(&vnode->lock); 1114260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 1115260a9803SDavid Howells afs_put_server(server); 1116260a9803SDavid Howells 1117260a9803SDavid Howells d_instantiate(dentry, inode); 1118260a9803SDavid Howells if (d_unhashed(dentry)) { 1119260a9803SDavid Howells _debug("not hashed"); 1120260a9803SDavid Howells d_rehash(dentry); 1121260a9803SDavid Howells } 1122260a9803SDavid Howells key_put(key); 1123260a9803SDavid Howells _leave(" = 0"); 1124260a9803SDavid Howells return 0; 1125260a9803SDavid Howells 1126260a9803SDavid Howells iget_error: 1127260a9803SDavid Howells afs_put_server(server); 1128260a9803SDavid Howells create_error: 1129260a9803SDavid Howells key_put(key); 1130260a9803SDavid Howells error: 1131260a9803SDavid Howells d_drop(dentry); 1132260a9803SDavid Howells _leave(" = %d", ret); 1133260a9803SDavid Howells return ret; 1134260a9803SDavid Howells } 1135260a9803SDavid Howells 1136260a9803SDavid Howells /* 1137260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1138260a9803SDavid Howells */ 1139260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 1140260a9803SDavid Howells struct inode *new_dir, struct dentry *new_dentry) 1141260a9803SDavid Howells { 1142260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1143260a9803SDavid Howells struct key *key; 1144260a9803SDavid Howells int ret; 1145260a9803SDavid Howells 1146260a9803SDavid Howells vnode = AFS_FS_I(old_dentry->d_inode); 1147260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1148260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1149260a9803SDavid Howells 1150416351f2SDavid Howells _enter("{%x:%u},{%x:%u},{%x:%u},{%s}", 1151260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1152260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1153260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1154260a9803SDavid Howells new_dentry->d_name.name); 1155260a9803SDavid Howells 1156260a9803SDavid Howells ret = -ENAMETOOLONG; 115745222b9eSDavid Howells if (new_dentry->d_name.len >= AFSNAMEMAX) 1158260a9803SDavid Howells goto error; 1159260a9803SDavid Howells 1160260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1161260a9803SDavid Howells if (IS_ERR(key)) { 1162260a9803SDavid Howells ret = PTR_ERR(key); 1163260a9803SDavid Howells goto error; 1164260a9803SDavid Howells } 1165260a9803SDavid Howells 1166260a9803SDavid Howells ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, 1167260a9803SDavid Howells old_dentry->d_name.name, 1168260a9803SDavid Howells new_dentry->d_name.name); 1169260a9803SDavid Howells if (ret < 0) 1170260a9803SDavid Howells goto rename_error; 1171260a9803SDavid Howells key_put(key); 1172260a9803SDavid Howells _leave(" = 0"); 1173260a9803SDavid Howells return 0; 1174260a9803SDavid Howells 1175260a9803SDavid Howells rename_error: 1176260a9803SDavid Howells key_put(key); 1177260a9803SDavid Howells error: 1178260a9803SDavid Howells d_drop(new_dentry); 1179260a9803SDavid Howells _leave(" = %d", ret); 1180260a9803SDavid Howells return ret; 1181260a9803SDavid Howells } 1182