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> 19e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 201da177e4SLinus Torvalds #include "internal.h" 211da177e4SLinus Torvalds 22260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 231da177e4SLinus Torvalds struct nameidata *nd); 241da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file); 25260a9803SDavid Howells static int afs_readdir(struct file *file, void *dirent, filldir_t filldir); 261da177e4SLinus Torvalds static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd); 271da177e4SLinus Torvalds static int afs_d_delete(struct dentry *dentry); 28260a9803SDavid Howells static void afs_d_release(struct dentry *dentry); 29260a9803SDavid Howells static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, 30afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 31260a9803SDavid Howells static int afs_create(struct inode *dir, struct dentry *dentry, int mode, 32260a9803SDavid Howells struct nameidata *nd); 33260a9803SDavid Howells static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode); 34260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry); 35260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry); 36260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 37260a9803SDavid Howells struct dentry *dentry); 38260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 39260a9803SDavid Howells const char *content); 40260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 41260a9803SDavid Howells struct inode *new_dir, struct dentry *new_dentry); 421da177e4SLinus Torvalds 434b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 441da177e4SLinus Torvalds .open = afs_dir_open, 4500d3b7a4SDavid Howells .release = afs_release, 46260a9803SDavid Howells .readdir = afs_readdir, 47e8d6c554SDavid Howells .lock = afs_lock, 483222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 491da177e4SLinus Torvalds }; 501da177e4SLinus Torvalds 51754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 52260a9803SDavid Howells .create = afs_create, 53260a9803SDavid Howells .lookup = afs_lookup, 54260a9803SDavid Howells .link = afs_link, 55260a9803SDavid Howells .unlink = afs_unlink, 56260a9803SDavid Howells .symlink = afs_symlink, 57260a9803SDavid Howells .mkdir = afs_mkdir, 58260a9803SDavid Howells .rmdir = afs_rmdir, 59260a9803SDavid Howells .rename = afs_rename, 6000d3b7a4SDavid Howells .permission = afs_permission, 61416351f2SDavid Howells .getattr = afs_getattr, 6231143d5dSDavid Howells .setattr = afs_setattr, 631da177e4SLinus Torvalds }; 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds static struct dentry_operations afs_fs_dentry_operations = { 661da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 671da177e4SLinus Torvalds .d_delete = afs_d_delete, 68260a9803SDavid Howells .d_release = afs_d_release, 691da177e4SLinus Torvalds }; 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds #define AFS_DIR_HASHTBL_SIZE 128 721da177e4SLinus Torvalds #define AFS_DIR_DIRENT_SIZE 32 731da177e4SLinus Torvalds #define AFS_DIRENT_PER_BLOCK 64 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds union afs_dirent { 761da177e4SLinus Torvalds struct { 771da177e4SLinus Torvalds uint8_t valid; 781da177e4SLinus Torvalds uint8_t unused[1]; 791da177e4SLinus Torvalds __be16 hash_next; 801da177e4SLinus Torvalds __be32 vnode; 811da177e4SLinus Torvalds __be32 unique; 821da177e4SLinus Torvalds uint8_t name[16]; 831da177e4SLinus Torvalds uint8_t overflow[4]; /* if any char of the name (inc 841da177e4SLinus Torvalds * NUL) reaches here, consume 851da177e4SLinus Torvalds * the next dirent too */ 861da177e4SLinus Torvalds } u; 871da177e4SLinus Torvalds uint8_t extended_name[32]; 881da177e4SLinus Torvalds }; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ 911da177e4SLinus Torvalds struct afs_dir_pagehdr { 921da177e4SLinus Torvalds __be16 npages; 931da177e4SLinus Torvalds __be16 magic; 941da177e4SLinus Torvalds #define AFS_DIR_MAGIC htons(1234) 951da177e4SLinus Torvalds uint8_t nentries; 961da177e4SLinus Torvalds uint8_t bitmap[8]; 971da177e4SLinus Torvalds uint8_t pad[19]; 981da177e4SLinus Torvalds }; 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds /* directory block layout */ 1011da177e4SLinus Torvalds union afs_dir_block { 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds struct { 1061da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1071da177e4SLinus Torvalds uint8_t alloc_ctrs[128]; 1081da177e4SLinus Torvalds /* dir hash table */ 1091da177e4SLinus Torvalds uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; 1101da177e4SLinus Torvalds } hdr; 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; 1131da177e4SLinus Torvalds }; 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds /* layout on a linux VM page */ 1161da177e4SLinus Torvalds struct afs_dir_page { 1171da177e4SLinus Torvalds union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; 1181da177e4SLinus Torvalds }; 1191da177e4SLinus Torvalds 120260a9803SDavid Howells struct afs_lookup_cookie { 1211da177e4SLinus Torvalds struct afs_fid fid; 1221da177e4SLinus Torvalds const char *name; 1231da177e4SLinus Torvalds size_t nlen; 1241da177e4SLinus Torvalds int found; 1251da177e4SLinus Torvalds }; 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds /* 1281da177e4SLinus Torvalds * check that a directory page is valid 1291da177e4SLinus Torvalds */ 1301da177e4SLinus Torvalds static inline void afs_dir_check_page(struct inode *dir, struct page *page) 1311da177e4SLinus Torvalds { 1321da177e4SLinus Torvalds struct afs_dir_page *dbuf; 1331da177e4SLinus Torvalds loff_t latter; 1341da177e4SLinus Torvalds int tmp, qty; 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds #if 0 1371da177e4SLinus Torvalds /* check the page count */ 1381da177e4SLinus Torvalds qty = desc.size / sizeof(dbuf->blocks[0]); 1391da177e4SLinus Torvalds if (qty == 0) 1401da177e4SLinus Torvalds goto error; 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { 1431da177e4SLinus Torvalds printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", 144530b6412SHarvey Harrison __func__, dir->i_ino, qty, 14508e0e7c8SDavid Howells ntohs(dbuf->blocks[0].pagehdr.npages)); 1461da177e4SLinus Torvalds goto error; 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds #endif 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds /* determine how many magic numbers there should be in this page */ 15154b21a79SAndrew Morton latter = dir->i_size - page_offset(page); 1521da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1531da177e4SLinus Torvalds qty = PAGE_SIZE; 1541da177e4SLinus Torvalds else 1551da177e4SLinus Torvalds qty = latter; 1561da177e4SLinus Torvalds qty /= sizeof(union afs_dir_block); 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds /* check them */ 1591da177e4SLinus Torvalds dbuf = page_address(page); 1601da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 1611da177e4SLinus Torvalds if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { 1621da177e4SLinus Torvalds printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n", 163530b6412SHarvey Harrison __func__, dir->i_ino, tmp, qty, 1641da177e4SLinus Torvalds ntohs(dbuf->blocks[tmp].pagehdr.magic)); 1651da177e4SLinus Torvalds goto error; 1661da177e4SLinus Torvalds } 1671da177e4SLinus Torvalds } 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds SetPageChecked(page); 1701da177e4SLinus Torvalds return; 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds error: 1731da177e4SLinus Torvalds SetPageChecked(page); 1741da177e4SLinus Torvalds SetPageError(page); 175ec26815aSDavid Howells } 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds /* 1781da177e4SLinus Torvalds * discard a page cached in the pagecache 1791da177e4SLinus Torvalds */ 1801da177e4SLinus Torvalds static inline void afs_dir_put_page(struct page *page) 1811da177e4SLinus Torvalds { 1821da177e4SLinus Torvalds kunmap(page); 1831da177e4SLinus Torvalds page_cache_release(page); 184ec26815aSDavid Howells } 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds /* 1871da177e4SLinus Torvalds * get a page into the pagecache 1881da177e4SLinus Torvalds */ 18900d3b7a4SDavid Howells static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, 19000d3b7a4SDavid Howells struct key *key) 1911da177e4SLinus Torvalds { 1921da177e4SLinus Torvalds struct page *page; 19300d3b7a4SDavid Howells struct file file = { 19400d3b7a4SDavid Howells .private_data = key, 19500d3b7a4SDavid Howells }; 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds _enter("{%lu},%lu", dir->i_ino, index); 1981da177e4SLinus Torvalds 19900d3b7a4SDavid Howells page = read_mapping_page(dir->i_mapping, index, &file); 2001da177e4SLinus Torvalds if (!IS_ERR(page)) { 2011da177e4SLinus Torvalds kmap(page); 2021da177e4SLinus Torvalds if (!PageChecked(page)) 2031da177e4SLinus Torvalds afs_dir_check_page(dir, page); 2041da177e4SLinus Torvalds if (PageError(page)) 2051da177e4SLinus Torvalds goto fail; 2061da177e4SLinus Torvalds } 2071da177e4SLinus Torvalds return page; 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds fail: 2101da177e4SLinus Torvalds afs_dir_put_page(page); 21108e0e7c8SDavid Howells _leave(" = -EIO"); 2121da177e4SLinus Torvalds return ERR_PTR(-EIO); 213ec26815aSDavid Howells } 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds /* 2161da177e4SLinus Torvalds * open an AFS directory file 2171da177e4SLinus Torvalds */ 2181da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 2191da177e4SLinus Torvalds { 2201da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 2211da177e4SLinus Torvalds 2222ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 2232ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 2241da177e4SLinus Torvalds 22508e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2261da177e4SLinus Torvalds return -ENOENT; 2271da177e4SLinus Torvalds 22800d3b7a4SDavid Howells return afs_open(inode, file); 229ec26815aSDavid Howells } 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds /* 2321da177e4SLinus Torvalds * deal with one block in an AFS directory 2331da177e4SLinus Torvalds */ 2341da177e4SLinus Torvalds static int afs_dir_iterate_block(unsigned *fpos, 2351da177e4SLinus Torvalds union afs_dir_block *block, 2361da177e4SLinus Torvalds unsigned blkoff, 2371da177e4SLinus Torvalds void *cookie, 2381da177e4SLinus Torvalds filldir_t filldir) 2391da177e4SLinus Torvalds { 2401da177e4SLinus Torvalds union afs_dirent *dire; 2411da177e4SLinus Torvalds unsigned offset, next, curr; 2421da177e4SLinus Torvalds size_t nlen; 2431da177e4SLinus Torvalds int tmp, ret; 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds _enter("%u,%x,%p,,",*fpos,blkoff,block); 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds curr = (*fpos - blkoff) / sizeof(union afs_dirent); 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 2501da177e4SLinus Torvalds for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; 2511da177e4SLinus Torvalds offset < AFS_DIRENT_PER_BLOCK; 2521da177e4SLinus Torvalds offset = next 2531da177e4SLinus Torvalds ) { 2541da177e4SLinus Torvalds next = offset + 1; 2551da177e4SLinus Torvalds 2561da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 2571da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[offset / 8] & 2581da177e4SLinus Torvalds (1 << (offset % 8)))) { 25908e0e7c8SDavid Howells _debug("ENT[%Zu.%u]: unused", 2601da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset); 2611da177e4SLinus Torvalds if (offset >= curr) 2621da177e4SLinus Torvalds *fpos = blkoff + 2631da177e4SLinus Torvalds next * sizeof(union afs_dirent); 2641da177e4SLinus Torvalds continue; 2651da177e4SLinus Torvalds } 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds /* got a valid entry */ 2681da177e4SLinus Torvalds dire = &block->dirents[offset]; 2691da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 2701da177e4SLinus Torvalds sizeof(*block) - 2711da177e4SLinus Torvalds offset * sizeof(union afs_dirent)); 2721da177e4SLinus Torvalds 27308e0e7c8SDavid Howells _debug("ENT[%Zu.%u]: %s %Zu \"%s\"", 2741da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset, 2751da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 2761da177e4SLinus Torvalds nlen, dire->u.name); 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds /* work out where the next possible entry is */ 2791da177e4SLinus Torvalds for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { 2801da177e4SLinus Torvalds if (next >= AFS_DIRENT_PER_BLOCK) { 2811da177e4SLinus Torvalds _debug("ENT[%Zu.%u]:" 2821da177e4SLinus Torvalds " %u travelled beyond end dir block" 28308e0e7c8SDavid Howells " (len %u/%Zu)", 2841da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 2851da177e4SLinus Torvalds offset, next, tmp, nlen); 2861da177e4SLinus Torvalds return -EIO; 2871da177e4SLinus Torvalds } 2881da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[next / 8] & 2891da177e4SLinus Torvalds (1 << (next % 8)))) { 2901da177e4SLinus Torvalds _debug("ENT[%Zu.%u]:" 29108e0e7c8SDavid Howells " %u unmarked extension (len %u/%Zu)", 2921da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 2931da177e4SLinus Torvalds offset, next, tmp, nlen); 2941da177e4SLinus Torvalds return -EIO; 2951da177e4SLinus Torvalds } 2961da177e4SLinus Torvalds 29708e0e7c8SDavid Howells _debug("ENT[%Zu.%u]: ext %u/%Zu", 2981da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 2991da177e4SLinus Torvalds next, tmp, nlen); 3001da177e4SLinus Torvalds next++; 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds /* skip if starts before the current position */ 3041da177e4SLinus Torvalds if (offset < curr) 3051da177e4SLinus Torvalds continue; 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvalds /* found the next entry */ 3081da177e4SLinus Torvalds ret = filldir(cookie, 3091da177e4SLinus Torvalds dire->u.name, 3101da177e4SLinus Torvalds nlen, 3111da177e4SLinus Torvalds blkoff + offset * sizeof(union afs_dirent), 3121da177e4SLinus Torvalds ntohl(dire->u.vnode), 313260a9803SDavid Howells filldir == afs_lookup_filldir ? 3141da177e4SLinus Torvalds ntohl(dire->u.unique) : DT_UNKNOWN); 3151da177e4SLinus Torvalds if (ret < 0) { 3161da177e4SLinus Torvalds _leave(" = 0 [full]"); 3171da177e4SLinus Torvalds return 0; 3181da177e4SLinus Torvalds } 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds *fpos = blkoff + next * sizeof(union afs_dirent); 3211da177e4SLinus Torvalds } 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds _leave(" = 1 [more]"); 3241da177e4SLinus Torvalds return 1; 325ec26815aSDavid Howells } 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds /* 32808e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 3291da177e4SLinus Torvalds */ 3301da177e4SLinus Torvalds static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie, 33100d3b7a4SDavid Howells filldir_t filldir, struct key *key) 3321da177e4SLinus Torvalds { 3331da177e4SLinus Torvalds union afs_dir_block *dblock; 3341da177e4SLinus Torvalds struct afs_dir_page *dbuf; 3351da177e4SLinus Torvalds struct page *page; 3361da177e4SLinus Torvalds unsigned blkoff, limit; 3371da177e4SLinus Torvalds int ret; 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds _enter("{%lu},%u,,", dir->i_ino, *fpos); 3401da177e4SLinus Torvalds 34108e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 3421da177e4SLinus Torvalds _leave(" = -ESTALE"); 3431da177e4SLinus Torvalds return -ESTALE; 3441da177e4SLinus Torvalds } 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 3471da177e4SLinus Torvalds *fpos += sizeof(union afs_dirent) - 1; 3481da177e4SLinus Torvalds *fpos &= ~(sizeof(union afs_dirent) - 1); 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds /* walk through the blocks in sequence */ 3511da177e4SLinus Torvalds ret = 0; 3521da177e4SLinus Torvalds while (*fpos < dir->i_size) { 3531da177e4SLinus Torvalds blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1); 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds /* fetch the appropriate page from the directory */ 35600d3b7a4SDavid Howells page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); 3571da177e4SLinus Torvalds if (IS_ERR(page)) { 3581da177e4SLinus Torvalds ret = PTR_ERR(page); 3591da177e4SLinus Torvalds break; 3601da177e4SLinus Torvalds } 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds dbuf = page_address(page); 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 3671da177e4SLinus Torvalds do { 3681da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 3691da177e4SLinus Torvalds sizeof(union afs_dir_block)]; 3701da177e4SLinus Torvalds ret = afs_dir_iterate_block(fpos, dblock, blkoff, 3711da177e4SLinus Torvalds cookie, filldir); 3721da177e4SLinus Torvalds if (ret != 1) { 3731da177e4SLinus Torvalds afs_dir_put_page(page); 3741da177e4SLinus Torvalds goto out; 3751da177e4SLinus Torvalds } 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds blkoff += sizeof(union afs_dir_block); 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds } while (*fpos < dir->i_size && blkoff < limit); 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds afs_dir_put_page(page); 3821da177e4SLinus Torvalds ret = 0; 3831da177e4SLinus Torvalds } 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds out: 3861da177e4SLinus Torvalds _leave(" = %d", ret); 3871da177e4SLinus Torvalds return ret; 388ec26815aSDavid Howells } 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds /* 3911da177e4SLinus Torvalds * read an AFS directory 3921da177e4SLinus Torvalds */ 393260a9803SDavid Howells static int afs_readdir(struct file *file, void *cookie, filldir_t filldir) 3941da177e4SLinus Torvalds { 3951da177e4SLinus Torvalds unsigned fpos; 3961da177e4SLinus Torvalds int ret; 3971da177e4SLinus Torvalds 39808e0e7c8SDavid Howells _enter("{%Ld,{%lu}}", 39908e0e7c8SDavid Howells file->f_pos, file->f_path.dentry->d_inode->i_ino); 4001da177e4SLinus Torvalds 40100d3b7a4SDavid Howells ASSERT(file->private_data != NULL); 40200d3b7a4SDavid Howells 4031da177e4SLinus Torvalds fpos = file->f_pos; 40408e0e7c8SDavid Howells ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos, 40500d3b7a4SDavid Howells cookie, filldir, file->private_data); 4061da177e4SLinus Torvalds file->f_pos = fpos; 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds _leave(" = %d", ret); 4091da177e4SLinus Torvalds return ret; 410ec26815aSDavid Howells } 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds /* 4131da177e4SLinus Torvalds * search the directory for a name 4141da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 4151da177e4SLinus Torvalds * uniquifier through dtype 4161da177e4SLinus Torvalds */ 417260a9803SDavid Howells static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, 418afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype) 4191da177e4SLinus Torvalds { 420260a9803SDavid Howells struct afs_lookup_cookie *cookie = _cookie; 4211da177e4SLinus Torvalds 42208e0e7c8SDavid Howells _enter("{%s,%Zu},%s,%u,,%llu,%u", 423ba3e0e1aSDavid S. Miller cookie->name, cookie->nlen, name, nlen, 424ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 4251da177e4SLinus Torvalds 42608e0e7c8SDavid Howells /* insanity checks first */ 42708e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 42808e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 42908e0e7c8SDavid Howells 4301da177e4SLinus Torvalds if (cookie->nlen != nlen || memcmp(cookie->name, name, nlen) != 0) { 4311da177e4SLinus Torvalds _leave(" = 0 [no]"); 4321da177e4SLinus Torvalds return 0; 4331da177e4SLinus Torvalds } 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds cookie->fid.vnode = ino; 4361da177e4SLinus Torvalds cookie->fid.unique = dtype; 4371da177e4SLinus Torvalds cookie->found = 1; 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds _leave(" = -1 [found]"); 4401da177e4SLinus Torvalds return -1; 441ec26815aSDavid Howells } 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds /* 44408e0e7c8SDavid Howells * do a lookup in a directory 445260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 4461da177e4SLinus Torvalds */ 44708e0e7c8SDavid Howells static int afs_do_lookup(struct inode *dir, struct dentry *dentry, 44800d3b7a4SDavid Howells struct afs_fid *fid, struct key *key) 4491da177e4SLinus Torvalds { 450260a9803SDavid Howells struct afs_lookup_cookie cookie; 4511da177e4SLinus Torvalds struct afs_super_info *as; 4521da177e4SLinus Torvalds unsigned fpos; 4531da177e4SLinus Torvalds int ret; 4541da177e4SLinus Torvalds 45508e0e7c8SDavid Howells _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name); 4561da177e4SLinus Torvalds 4571da177e4SLinus Torvalds as = dir->i_sb->s_fs_info; 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds /* search the directory */ 4601da177e4SLinus Torvalds cookie.name = dentry->d_name.name; 4611da177e4SLinus Torvalds cookie.nlen = dentry->d_name.len; 4621da177e4SLinus Torvalds cookie.fid.vid = as->volume->vid; 4631da177e4SLinus Torvalds cookie.found = 0; 4641da177e4SLinus Torvalds 4651da177e4SLinus Torvalds fpos = 0; 466260a9803SDavid Howells ret = afs_dir_iterate(dir, &fpos, &cookie, afs_lookup_filldir, 46700d3b7a4SDavid Howells key); 4681da177e4SLinus Torvalds if (ret < 0) { 46908e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 47008e0e7c8SDavid Howells return ret; 4711da177e4SLinus Torvalds } 4721da177e4SLinus Torvalds 4731da177e4SLinus Torvalds ret = -ENOENT; 4741da177e4SLinus Torvalds if (!cookie.found) { 47508e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 47608e0e7c8SDavid Howells return -ENOENT; 47708e0e7c8SDavid Howells } 47808e0e7c8SDavid Howells 47908e0e7c8SDavid Howells *fid = cookie.fid; 48008e0e7c8SDavid Howells _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); 48108e0e7c8SDavid Howells return 0; 48208e0e7c8SDavid Howells } 48308e0e7c8SDavid Howells 48408e0e7c8SDavid Howells /* 48508e0e7c8SDavid Howells * look up an entry in a directory 48608e0e7c8SDavid Howells */ 487260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 48808e0e7c8SDavid Howells struct nameidata *nd) 48908e0e7c8SDavid Howells { 49008e0e7c8SDavid Howells struct afs_vnode *vnode; 49108e0e7c8SDavid Howells struct afs_fid fid; 49208e0e7c8SDavid Howells struct inode *inode; 49300d3b7a4SDavid Howells struct key *key; 49408e0e7c8SDavid Howells int ret; 49508e0e7c8SDavid Howells 496260a9803SDavid Howells vnode = AFS_FS_I(dir); 497260a9803SDavid Howells 498416351f2SDavid Howells _enter("{%x:%u},%p{%s},", 499260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name); 500260a9803SDavid Howells 501260a9803SDavid Howells ASSERTCMP(dentry->d_inode, ==, NULL); 50208e0e7c8SDavid Howells 50345222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 50408e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 50508e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 50608e0e7c8SDavid Howells } 50708e0e7c8SDavid Howells 50808e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 50908e0e7c8SDavid Howells _leave(" = -ESTALE"); 51008e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 51108e0e7c8SDavid Howells } 51208e0e7c8SDavid Howells 51300d3b7a4SDavid Howells key = afs_request_key(vnode->volume->cell); 51400d3b7a4SDavid Howells if (IS_ERR(key)) { 51500d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 516e231c2eeSDavid Howells return ERR_CAST(key); 51700d3b7a4SDavid Howells } 51800d3b7a4SDavid Howells 519260a9803SDavid Howells ret = afs_validate(vnode, key); 52008e0e7c8SDavid Howells if (ret < 0) { 52100d3b7a4SDavid Howells key_put(key); 522260a9803SDavid Howells _leave(" = %d [val]", ret); 5231da177e4SLinus Torvalds return ERR_PTR(ret); 5241da177e4SLinus Torvalds } 5251da177e4SLinus Torvalds 526260a9803SDavid Howells ret = afs_do_lookup(dir, dentry, &fid, key); 527260a9803SDavid Howells if (ret < 0) { 528260a9803SDavid Howells key_put(key); 529260a9803SDavid Howells if (ret == -ENOENT) { 530260a9803SDavid Howells d_add(dentry, NULL); 531260a9803SDavid Howells _leave(" = NULL [negative]"); 532260a9803SDavid Howells return NULL; 533260a9803SDavid Howells } 534260a9803SDavid Howells _leave(" = %d [do]", ret); 535260a9803SDavid Howells return ERR_PTR(ret); 536260a9803SDavid Howells } 537260a9803SDavid Howells dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; 538260a9803SDavid Howells 5391da177e4SLinus Torvalds /* instantiate the dentry */ 540260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); 54100d3b7a4SDavid Howells key_put(key); 54208e0e7c8SDavid Howells if (IS_ERR(inode)) { 54308e0e7c8SDavid Howells _leave(" = %ld", PTR_ERR(inode)); 544e231c2eeSDavid Howells return ERR_CAST(inode); 5451da177e4SLinus Torvalds } 5461da177e4SLinus Torvalds 5471da177e4SLinus Torvalds dentry->d_op = &afs_fs_dentry_operations; 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds d_add(dentry, inode); 5507a224228SJean Noel Cordenner _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }", 55108e0e7c8SDavid Howells fid.vnode, 55208e0e7c8SDavid Howells fid.unique, 5531da177e4SLinus Torvalds dentry->d_inode->i_ino, 5547a224228SJean Noel Cordenner (unsigned long long)dentry->d_inode->i_version); 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds return NULL; 557ec26815aSDavid Howells } 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds /* 5601da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 5611da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 5621da177e4SLinus Torvalds * inode 5631da177e4SLinus Torvalds */ 5641da177e4SLinus Torvalds static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd) 5651da177e4SLinus Torvalds { 566260a9803SDavid Howells struct afs_vnode *vnode, *dir; 56708e0e7c8SDavid Howells struct afs_fid fid; 5681da177e4SLinus Torvalds struct dentry *parent; 56900d3b7a4SDavid Howells struct key *key; 570260a9803SDavid Howells void *dir_version; 5711da177e4SLinus Torvalds int ret; 5721da177e4SLinus Torvalds 57308e0e7c8SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 57408e0e7c8SDavid Howells 575260a9803SDavid Howells if (dentry->d_inode) 576260a9803SDavid Howells _enter("{v={%x:%u} n=%s fl=%lx},", 577260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name, 578260a9803SDavid Howells vnode->flags); 579260a9803SDavid Howells else 580260a9803SDavid Howells _enter("{neg n=%s}", dentry->d_name.name); 5811da177e4SLinus Torvalds 582260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 58300d3b7a4SDavid Howells if (IS_ERR(key)) 58400d3b7a4SDavid Howells key = NULL; 58500d3b7a4SDavid Howells 5861da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 58708e0e7c8SDavid Howells parent = dget_parent(dentry); 588260a9803SDavid Howells if (!parent->d_inode) 5891da177e4SLinus Torvalds goto out_bad; 5901da177e4SLinus Torvalds 591260a9803SDavid Howells dir = AFS_FS_I(parent->d_inode); 5921da177e4SLinus Torvalds 593260a9803SDavid Howells /* validate the parent directory */ 594260a9803SDavid Howells if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) 595260a9803SDavid Howells afs_validate(dir, key); 596260a9803SDavid Howells 597260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 5981da177e4SLinus Torvalds _debug("%s: parent dir deleted", dentry->d_name.name); 5991da177e4SLinus Torvalds goto out_bad; 6001da177e4SLinus Torvalds } 6011da177e4SLinus Torvalds 602260a9803SDavid Howells dir_version = (void *) (unsigned long) dir->status.data_version; 603260a9803SDavid Howells if (dentry->d_fsdata == dir_version) 604260a9803SDavid Howells goto out_valid; /* the dir contents are unchanged */ 605260a9803SDavid Howells 60608e0e7c8SDavid Howells _debug("dir modified"); 6071da177e4SLinus Torvalds 6081da177e4SLinus Torvalds /* search the directory for this vnode */ 609260a9803SDavid Howells ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); 610260a9803SDavid Howells switch (ret) { 611260a9803SDavid Howells case 0: 612260a9803SDavid Howells /* the filename maps to something */ 613260a9803SDavid Howells if (!dentry->d_inode) 614260a9803SDavid Howells goto out_bad; 615260a9803SDavid Howells if (is_bad_inode(dentry->d_inode)) { 616260a9803SDavid Howells printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n", 617260a9803SDavid Howells parent->d_name.name, dentry->d_name.name); 6181da177e4SLinus Torvalds goto out_bad; 6191da177e4SLinus Torvalds } 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 6221da177e4SLinus Torvalds * different file */ 62308e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 62408e0e7c8SDavid Howells _debug("%s: dirent changed [%u != %u]", 62508e0e7c8SDavid Howells dentry->d_name.name, fid.vnode, 62608e0e7c8SDavid Howells vnode->fid.vnode); 6271da177e4SLinus Torvalds goto not_found; 6281da177e4SLinus Torvalds } 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 631260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 632260a9803SDavid Howells * been reused */ 63308e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 6347a224228SJean Noel Cordenner _debug("%s: file deleted (uq %u -> %u I:%llu)", 63508e0e7c8SDavid Howells dentry->d_name.name, fid.unique, 6367a224228SJean Noel Cordenner vnode->fid.unique, 6377a224228SJean Noel Cordenner (unsigned long long)dentry->d_inode->i_version); 63808e0e7c8SDavid Howells spin_lock(&vnode->lock); 63908e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 64008e0e7c8SDavid Howells spin_unlock(&vnode->lock); 641260a9803SDavid Howells goto not_found; 642260a9803SDavid Howells } 643260a9803SDavid Howells goto out_valid; 644260a9803SDavid Howells 645260a9803SDavid Howells case -ENOENT: 646260a9803SDavid Howells /* the filename is unknown */ 647260a9803SDavid Howells _debug("%s: dirent not found", dentry->d_name.name); 648260a9803SDavid Howells if (dentry->d_inode) 649260a9803SDavid Howells goto not_found; 650260a9803SDavid Howells goto out_valid; 651260a9803SDavid Howells 652260a9803SDavid Howells default: 653260a9803SDavid Howells _debug("failed to iterate dir %s: %d", 654260a9803SDavid Howells parent->d_name.name, ret); 6551da177e4SLinus Torvalds goto out_bad; 6561da177e4SLinus Torvalds } 65708e0e7c8SDavid Howells 6581da177e4SLinus Torvalds out_valid: 659260a9803SDavid Howells dentry->d_fsdata = dir_version; 660260a9803SDavid Howells out_skip: 6611da177e4SLinus Torvalds dput(parent); 66200d3b7a4SDavid Howells key_put(key); 6631da177e4SLinus Torvalds _leave(" = 1 [valid]"); 6641da177e4SLinus Torvalds return 1; 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 6671da177e4SLinus Torvalds not_found: 6681da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 6691da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 6701da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds out_bad: 673260a9803SDavid Howells if (dentry->d_inode) { 6741da177e4SLinus Torvalds /* don't unhash if we have submounts */ 6751da177e4SLinus Torvalds if (have_submounts(dentry)) 676260a9803SDavid Howells goto out_skip; 6771da177e4SLinus Torvalds } 6781da177e4SLinus Torvalds 6791da177e4SLinus Torvalds _debug("dropping dentry %s/%s", 68008e0e7c8SDavid Howells parent->d_name.name, dentry->d_name.name); 68108e0e7c8SDavid Howells shrink_dcache_parent(dentry); 6821da177e4SLinus Torvalds d_drop(dentry); 6831da177e4SLinus Torvalds dput(parent); 68400d3b7a4SDavid Howells key_put(key); 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds _leave(" = 0 [bad]"); 6871da177e4SLinus Torvalds return 0; 688ec26815aSDavid Howells } 6891da177e4SLinus Torvalds 6901da177e4SLinus Torvalds /* 6911da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 6921da177e4SLinus Torvalds * sleep) 6931da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 6941da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 6951da177e4SLinus Torvalds */ 6961da177e4SLinus Torvalds static int afs_d_delete(struct dentry *dentry) 6971da177e4SLinus Torvalds { 6981da177e4SLinus Torvalds _enter("%s", dentry->d_name.name); 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 7011da177e4SLinus Torvalds goto zap; 7021da177e4SLinus Torvalds 70308e0e7c8SDavid Howells if (dentry->d_inode && 70408e0e7c8SDavid Howells test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags)) 7051da177e4SLinus Torvalds goto zap; 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds _leave(" = 0 [keep]"); 7081da177e4SLinus Torvalds return 0; 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds zap: 7111da177e4SLinus Torvalds _leave(" = 1 [zap]"); 7121da177e4SLinus Torvalds return 1; 713ec26815aSDavid Howells } 714260a9803SDavid Howells 715260a9803SDavid Howells /* 716260a9803SDavid Howells * handle dentry release 717260a9803SDavid Howells */ 718260a9803SDavid Howells static void afs_d_release(struct dentry *dentry) 719260a9803SDavid Howells { 720260a9803SDavid Howells _enter("%s", dentry->d_name.name); 721260a9803SDavid Howells } 722260a9803SDavid Howells 723260a9803SDavid Howells /* 724260a9803SDavid Howells * create a directory on an AFS filesystem 725260a9803SDavid Howells */ 726260a9803SDavid Howells static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 727260a9803SDavid Howells { 728260a9803SDavid Howells struct afs_file_status status; 729260a9803SDavid Howells struct afs_callback cb; 730260a9803SDavid Howells struct afs_server *server; 731260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 732260a9803SDavid Howells struct afs_fid fid; 733260a9803SDavid Howells struct inode *inode; 734260a9803SDavid Howells struct key *key; 735260a9803SDavid Howells int ret; 736260a9803SDavid Howells 737260a9803SDavid Howells dvnode = AFS_FS_I(dir); 738260a9803SDavid Howells 739416351f2SDavid Howells _enter("{%x:%u},{%s},%o", 740260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 741260a9803SDavid Howells 742260a9803SDavid Howells ret = -ENAMETOOLONG; 74345222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 744260a9803SDavid Howells goto error; 745260a9803SDavid Howells 746260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 747260a9803SDavid Howells if (IS_ERR(key)) { 748260a9803SDavid Howells ret = PTR_ERR(key); 749260a9803SDavid Howells goto error; 750260a9803SDavid Howells } 751260a9803SDavid Howells 752260a9803SDavid Howells mode |= S_IFDIR; 753260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 754260a9803SDavid Howells mode, &fid, &status, &cb, &server); 755260a9803SDavid Howells if (ret < 0) 756260a9803SDavid Howells goto mkdir_error; 757260a9803SDavid Howells 758260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 759260a9803SDavid Howells if (IS_ERR(inode)) { 760260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 761260a9803SDavid Howells * directory on the server */ 762260a9803SDavid Howells ret = PTR_ERR(inode); 763260a9803SDavid Howells goto iget_error; 764260a9803SDavid Howells } 765260a9803SDavid Howells 766260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 767260a9803SDavid Howells vnode = AFS_FS_I(inode); 768260a9803SDavid Howells spin_lock(&vnode->lock); 769260a9803SDavid Howells vnode->update_cnt++; 770260a9803SDavid Howells spin_unlock(&vnode->lock); 771260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 772260a9803SDavid Howells afs_put_server(server); 773260a9803SDavid Howells 774260a9803SDavid Howells d_instantiate(dentry, inode); 775260a9803SDavid Howells if (d_unhashed(dentry)) { 776260a9803SDavid Howells _debug("not hashed"); 777260a9803SDavid Howells d_rehash(dentry); 778260a9803SDavid Howells } 779260a9803SDavid Howells key_put(key); 780260a9803SDavid Howells _leave(" = 0"); 781260a9803SDavid Howells return 0; 782260a9803SDavid Howells 783260a9803SDavid Howells iget_error: 784260a9803SDavid Howells afs_put_server(server); 785260a9803SDavid Howells mkdir_error: 786260a9803SDavid Howells key_put(key); 787260a9803SDavid Howells error: 788260a9803SDavid Howells d_drop(dentry); 789260a9803SDavid Howells _leave(" = %d", ret); 790260a9803SDavid Howells return ret; 791260a9803SDavid Howells } 792260a9803SDavid Howells 793260a9803SDavid Howells /* 794260a9803SDavid Howells * remove a directory from an AFS filesystem 795260a9803SDavid Howells */ 796260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 797260a9803SDavid Howells { 798260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 799260a9803SDavid Howells struct key *key; 800260a9803SDavid Howells int ret; 801260a9803SDavid Howells 802260a9803SDavid Howells dvnode = AFS_FS_I(dir); 803260a9803SDavid Howells 804416351f2SDavid Howells _enter("{%x:%u},{%s}", 805260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 806260a9803SDavid Howells 807260a9803SDavid Howells ret = -ENAMETOOLONG; 80845222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 809260a9803SDavid Howells goto error; 810260a9803SDavid Howells 811260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 812260a9803SDavid Howells if (IS_ERR(key)) { 813260a9803SDavid Howells ret = PTR_ERR(key); 814260a9803SDavid Howells goto error; 815260a9803SDavid Howells } 816260a9803SDavid Howells 817260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); 818260a9803SDavid Howells if (ret < 0) 819260a9803SDavid Howells goto rmdir_error; 820260a9803SDavid Howells 821260a9803SDavid Howells if (dentry->d_inode) { 822260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 823260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 824260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 825260a9803SDavid Howells afs_discard_callback_on_delete(vnode); 826260a9803SDavid Howells } 827260a9803SDavid Howells 828260a9803SDavid Howells key_put(key); 829260a9803SDavid Howells _leave(" = 0"); 830260a9803SDavid Howells return 0; 831260a9803SDavid Howells 832260a9803SDavid Howells rmdir_error: 833260a9803SDavid Howells key_put(key); 834260a9803SDavid Howells error: 835260a9803SDavid Howells _leave(" = %d", ret); 836260a9803SDavid Howells return ret; 837260a9803SDavid Howells } 838260a9803SDavid Howells 839260a9803SDavid Howells /* 840260a9803SDavid Howells * remove a file from an AFS filesystem 841260a9803SDavid Howells */ 842260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 843260a9803SDavid Howells { 844260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 845260a9803SDavid Howells struct key *key; 846260a9803SDavid Howells int ret; 847260a9803SDavid Howells 848260a9803SDavid Howells dvnode = AFS_FS_I(dir); 849260a9803SDavid Howells 850416351f2SDavid Howells _enter("{%x:%u},{%s}", 851260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 852260a9803SDavid Howells 853260a9803SDavid Howells ret = -ENAMETOOLONG; 85445222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 855260a9803SDavid Howells goto error; 856260a9803SDavid Howells 857260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 858260a9803SDavid Howells if (IS_ERR(key)) { 859260a9803SDavid Howells ret = PTR_ERR(key); 860260a9803SDavid Howells goto error; 861260a9803SDavid Howells } 862260a9803SDavid Howells 863260a9803SDavid Howells if (dentry->d_inode) { 864260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 865260a9803SDavid Howells 866260a9803SDavid Howells /* make sure we have a callback promise on the victim */ 867260a9803SDavid Howells ret = afs_validate(vnode, key); 868260a9803SDavid Howells if (ret < 0) 869260a9803SDavid Howells goto error; 870260a9803SDavid Howells } 871260a9803SDavid Howells 872260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); 873260a9803SDavid Howells if (ret < 0) 874260a9803SDavid Howells goto remove_error; 875260a9803SDavid Howells 876260a9803SDavid Howells if (dentry->d_inode) { 877260a9803SDavid Howells /* if the file wasn't deleted due to excess hard links, the 878260a9803SDavid Howells * fileserver will break the callback promise on the file - if 879260a9803SDavid Howells * it had one - before it returns to us, and if it was deleted, 880260a9803SDavid Howells * it won't 881260a9803SDavid Howells * 882260a9803SDavid Howells * however, if we didn't have a callback promise outstanding, 883260a9803SDavid Howells * or it was outstanding on a different server, then it won't 884260a9803SDavid Howells * break it either... 885260a9803SDavid Howells */ 886260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 887260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 888260a9803SDavid Howells _debug("AFS_VNODE_DELETED"); 889260a9803SDavid Howells if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) 890260a9803SDavid Howells _debug("AFS_VNODE_CB_BROKEN"); 891260a9803SDavid Howells set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); 892260a9803SDavid Howells ret = afs_validate(vnode, key); 893260a9803SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 894260a9803SDavid Howells } 895260a9803SDavid Howells 896260a9803SDavid Howells key_put(key); 897260a9803SDavid Howells _leave(" = 0"); 898260a9803SDavid Howells return 0; 899260a9803SDavid Howells 900260a9803SDavid Howells remove_error: 901260a9803SDavid Howells key_put(key); 902260a9803SDavid Howells error: 903260a9803SDavid Howells _leave(" = %d", ret); 904260a9803SDavid Howells return ret; 905260a9803SDavid Howells } 906260a9803SDavid Howells 907260a9803SDavid Howells /* 908260a9803SDavid Howells * create a regular file on an AFS filesystem 909260a9803SDavid Howells */ 910260a9803SDavid Howells static int afs_create(struct inode *dir, struct dentry *dentry, int mode, 911260a9803SDavid Howells struct nameidata *nd) 912260a9803SDavid Howells { 913260a9803SDavid Howells struct afs_file_status status; 914260a9803SDavid Howells struct afs_callback cb; 915260a9803SDavid Howells struct afs_server *server; 916260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 917260a9803SDavid Howells struct afs_fid fid; 918260a9803SDavid Howells struct inode *inode; 919260a9803SDavid Howells struct key *key; 920260a9803SDavid Howells int ret; 921260a9803SDavid Howells 922260a9803SDavid Howells dvnode = AFS_FS_I(dir); 923260a9803SDavid Howells 924416351f2SDavid Howells _enter("{%x:%u},{%s},%o,", 925260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 926260a9803SDavid Howells 927260a9803SDavid Howells ret = -ENAMETOOLONG; 92845222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 929260a9803SDavid Howells goto error; 930260a9803SDavid Howells 931260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 932260a9803SDavid Howells if (IS_ERR(key)) { 933260a9803SDavid Howells ret = PTR_ERR(key); 934260a9803SDavid Howells goto error; 935260a9803SDavid Howells } 936260a9803SDavid Howells 937260a9803SDavid Howells mode |= S_IFREG; 938260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 939260a9803SDavid Howells mode, &fid, &status, &cb, &server); 940260a9803SDavid Howells if (ret < 0) 941260a9803SDavid Howells goto create_error; 942260a9803SDavid Howells 943260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 944260a9803SDavid Howells if (IS_ERR(inode)) { 945260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 946260a9803SDavid Howells * directory on the server */ 947260a9803SDavid Howells ret = PTR_ERR(inode); 948260a9803SDavid Howells goto iget_error; 949260a9803SDavid Howells } 950260a9803SDavid Howells 951260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 952260a9803SDavid Howells vnode = AFS_FS_I(inode); 953260a9803SDavid Howells spin_lock(&vnode->lock); 954260a9803SDavid Howells vnode->update_cnt++; 955260a9803SDavid Howells spin_unlock(&vnode->lock); 956260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 957260a9803SDavid Howells afs_put_server(server); 958260a9803SDavid Howells 959260a9803SDavid Howells d_instantiate(dentry, inode); 960260a9803SDavid Howells if (d_unhashed(dentry)) { 961260a9803SDavid Howells _debug("not hashed"); 962260a9803SDavid Howells d_rehash(dentry); 963260a9803SDavid Howells } 964260a9803SDavid Howells key_put(key); 965260a9803SDavid Howells _leave(" = 0"); 966260a9803SDavid Howells return 0; 967260a9803SDavid Howells 968260a9803SDavid Howells iget_error: 969260a9803SDavid Howells afs_put_server(server); 970260a9803SDavid Howells create_error: 971260a9803SDavid Howells key_put(key); 972260a9803SDavid Howells error: 973260a9803SDavid Howells d_drop(dentry); 974260a9803SDavid Howells _leave(" = %d", ret); 975260a9803SDavid Howells return ret; 976260a9803SDavid Howells } 977260a9803SDavid Howells 978260a9803SDavid Howells /* 979260a9803SDavid Howells * create a hard link between files in an AFS filesystem 980260a9803SDavid Howells */ 981260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 982260a9803SDavid Howells struct dentry *dentry) 983260a9803SDavid Howells { 984260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 985260a9803SDavid Howells struct key *key; 986260a9803SDavid Howells int ret; 987260a9803SDavid Howells 988260a9803SDavid Howells vnode = AFS_FS_I(from->d_inode); 989260a9803SDavid Howells dvnode = AFS_FS_I(dir); 990260a9803SDavid Howells 991416351f2SDavid Howells _enter("{%x:%u},{%x:%u},{%s}", 992260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 993260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 994260a9803SDavid Howells dentry->d_name.name); 995260a9803SDavid Howells 996260a9803SDavid Howells ret = -ENAMETOOLONG; 99745222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 998260a9803SDavid Howells goto error; 999260a9803SDavid Howells 1000260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1001260a9803SDavid Howells if (IS_ERR(key)) { 1002260a9803SDavid Howells ret = PTR_ERR(key); 1003260a9803SDavid Howells goto error; 1004260a9803SDavid Howells } 1005260a9803SDavid Howells 1006260a9803SDavid Howells ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); 1007260a9803SDavid Howells if (ret < 0) 1008260a9803SDavid Howells goto link_error; 1009260a9803SDavid Howells 1010260a9803SDavid Howells atomic_inc(&vnode->vfs_inode.i_count); 1011260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1012260a9803SDavid Howells key_put(key); 1013260a9803SDavid Howells _leave(" = 0"); 1014260a9803SDavid Howells return 0; 1015260a9803SDavid Howells 1016260a9803SDavid Howells link_error: 1017260a9803SDavid Howells key_put(key); 1018260a9803SDavid Howells error: 1019260a9803SDavid Howells d_drop(dentry); 1020260a9803SDavid Howells _leave(" = %d", ret); 1021260a9803SDavid Howells return ret; 1022260a9803SDavid Howells } 1023260a9803SDavid Howells 1024260a9803SDavid Howells /* 1025260a9803SDavid Howells * create a symlink in an AFS filesystem 1026260a9803SDavid Howells */ 1027260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1028260a9803SDavid Howells const char *content) 1029260a9803SDavid Howells { 1030260a9803SDavid Howells struct afs_file_status status; 1031260a9803SDavid Howells struct afs_server *server; 1032260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1033260a9803SDavid Howells struct afs_fid fid; 1034260a9803SDavid Howells struct inode *inode; 1035260a9803SDavid Howells struct key *key; 1036260a9803SDavid Howells int ret; 1037260a9803SDavid Howells 1038260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1039260a9803SDavid Howells 1040416351f2SDavid Howells _enter("{%x:%u},{%s},%s", 1041260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, 1042260a9803SDavid Howells content); 1043260a9803SDavid Howells 1044260a9803SDavid Howells ret = -ENAMETOOLONG; 104545222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1046260a9803SDavid Howells goto error; 1047260a9803SDavid Howells 1048260a9803SDavid Howells ret = -EINVAL; 104945222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1050260a9803SDavid Howells goto error; 1051260a9803SDavid Howells 1052260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1053260a9803SDavid Howells if (IS_ERR(key)) { 1054260a9803SDavid Howells ret = PTR_ERR(key); 1055260a9803SDavid Howells goto error; 1056260a9803SDavid Howells } 1057260a9803SDavid Howells 1058260a9803SDavid Howells ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, 1059260a9803SDavid Howells &fid, &status, &server); 1060260a9803SDavid Howells if (ret < 0) 1061260a9803SDavid Howells goto create_error; 1062260a9803SDavid Howells 1063260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); 1064260a9803SDavid Howells if (IS_ERR(inode)) { 1065260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 1066260a9803SDavid Howells * directory on the server */ 1067260a9803SDavid Howells ret = PTR_ERR(inode); 1068260a9803SDavid Howells goto iget_error; 1069260a9803SDavid Howells } 1070260a9803SDavid Howells 1071260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 1072260a9803SDavid Howells vnode = AFS_FS_I(inode); 1073260a9803SDavid Howells spin_lock(&vnode->lock); 1074260a9803SDavid Howells vnode->update_cnt++; 1075260a9803SDavid Howells spin_unlock(&vnode->lock); 1076260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 1077260a9803SDavid Howells afs_put_server(server); 1078260a9803SDavid Howells 1079260a9803SDavid Howells d_instantiate(dentry, inode); 1080260a9803SDavid Howells if (d_unhashed(dentry)) { 1081260a9803SDavid Howells _debug("not hashed"); 1082260a9803SDavid Howells d_rehash(dentry); 1083260a9803SDavid Howells } 1084260a9803SDavid Howells key_put(key); 1085260a9803SDavid Howells _leave(" = 0"); 1086260a9803SDavid Howells return 0; 1087260a9803SDavid Howells 1088260a9803SDavid Howells iget_error: 1089260a9803SDavid Howells afs_put_server(server); 1090260a9803SDavid Howells create_error: 1091260a9803SDavid Howells key_put(key); 1092260a9803SDavid Howells error: 1093260a9803SDavid Howells d_drop(dentry); 1094260a9803SDavid Howells _leave(" = %d", ret); 1095260a9803SDavid Howells return ret; 1096260a9803SDavid Howells } 1097260a9803SDavid Howells 1098260a9803SDavid Howells /* 1099260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1100260a9803SDavid Howells */ 1101260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 1102260a9803SDavid Howells struct inode *new_dir, struct dentry *new_dentry) 1103260a9803SDavid Howells { 1104260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1105260a9803SDavid Howells struct key *key; 1106260a9803SDavid Howells int ret; 1107260a9803SDavid Howells 1108260a9803SDavid Howells vnode = AFS_FS_I(old_dentry->d_inode); 1109260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1110260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1111260a9803SDavid Howells 1112416351f2SDavid Howells _enter("{%x:%u},{%x:%u},{%x:%u},{%s}", 1113260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1114260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1115260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1116260a9803SDavid Howells new_dentry->d_name.name); 1117260a9803SDavid Howells 1118260a9803SDavid Howells ret = -ENAMETOOLONG; 111945222b9eSDavid Howells if (new_dentry->d_name.len >= AFSNAMEMAX) 1120260a9803SDavid Howells goto error; 1121260a9803SDavid Howells 1122260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1123260a9803SDavid Howells if (IS_ERR(key)) { 1124260a9803SDavid Howells ret = PTR_ERR(key); 1125260a9803SDavid Howells goto error; 1126260a9803SDavid Howells } 1127260a9803SDavid Howells 1128260a9803SDavid Howells ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, 1129260a9803SDavid Howells old_dentry->d_name.name, 1130260a9803SDavid Howells new_dentry->d_name.name); 1131260a9803SDavid Howells if (ret < 0) 1132260a9803SDavid Howells goto rename_error; 1133260a9803SDavid Howells key_put(key); 1134260a9803SDavid Howells _leave(" = 0"); 1135260a9803SDavid Howells return 0; 1136260a9803SDavid Howells 1137260a9803SDavid Howells rename_error: 1138260a9803SDavid Howells key_put(key); 1139260a9803SDavid Howells error: 1140260a9803SDavid Howells d_drop(new_dentry); 1141260a9803SDavid Howells _leave(" = %d", ret); 1142260a9803SDavid Howells return ret; 1143260a9803SDavid Howells } 1144