11da177e4SLinus Torvalds /* dir.c: AFS filesystem directory handling 21da177e4SLinus Torvalds * 31da177e4SLinus Torvalds * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. 41da177e4SLinus Torvalds * Written by David Howells (dhowells@redhat.com) 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 71da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 81da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 91da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds #include <linux/kernel.h> 131da177e4SLinus Torvalds #include <linux/module.h> 141da177e4SLinus Torvalds #include <linux/init.h> 151da177e4SLinus Torvalds #include <linux/slab.h> 161da177e4SLinus Torvalds #include <linux/fs.h> 171da177e4SLinus Torvalds #include <linux/pagemap.h> 1800d3b7a4SDavid Howells #include <linux/ctype.h> 191da177e4SLinus Torvalds #include "internal.h" 201da177e4SLinus Torvalds 21260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 221da177e4SLinus Torvalds struct nameidata *nd); 231da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file); 24260a9803SDavid Howells static int afs_readdir(struct file *file, void *dirent, filldir_t filldir); 251da177e4SLinus Torvalds static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd); 261da177e4SLinus Torvalds static int afs_d_delete(struct dentry *dentry); 27260a9803SDavid Howells static void afs_d_release(struct dentry *dentry); 28260a9803SDavid Howells static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, 29afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 30260a9803SDavid Howells static int afs_create(struct inode *dir, struct dentry *dentry, int mode, 31260a9803SDavid Howells struct nameidata *nd); 32260a9803SDavid Howells static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode); 33260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry); 34260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry); 35260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 36260a9803SDavid Howells struct dentry *dentry); 37260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 38260a9803SDavid Howells const char *content); 39260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 40260a9803SDavid Howells struct inode *new_dir, struct dentry *new_dentry); 411da177e4SLinus Torvalds 424b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 431da177e4SLinus Torvalds .open = afs_dir_open, 4400d3b7a4SDavid Howells .release = afs_release, 45260a9803SDavid Howells .readdir = afs_readdir, 461da177e4SLinus Torvalds }; 471da177e4SLinus Torvalds 48754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 49260a9803SDavid Howells .create = afs_create, 50260a9803SDavid Howells .lookup = afs_lookup, 51260a9803SDavid Howells .link = afs_link, 52260a9803SDavid Howells .unlink = afs_unlink, 53260a9803SDavid Howells .symlink = afs_symlink, 54260a9803SDavid Howells .mkdir = afs_mkdir, 55260a9803SDavid Howells .rmdir = afs_rmdir, 56260a9803SDavid Howells .rename = afs_rename, 5700d3b7a4SDavid Howells .permission = afs_permission, 58416351f2SDavid Howells .getattr = afs_getattr, 5931143d5dSDavid Howells .setattr = afs_setattr, 601da177e4SLinus Torvalds }; 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds static struct dentry_operations afs_fs_dentry_operations = { 631da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 641da177e4SLinus Torvalds .d_delete = afs_d_delete, 65260a9803SDavid Howells .d_release = afs_d_release, 661da177e4SLinus Torvalds }; 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds #define AFS_DIR_HASHTBL_SIZE 128 691da177e4SLinus Torvalds #define AFS_DIR_DIRENT_SIZE 32 701da177e4SLinus Torvalds #define AFS_DIRENT_PER_BLOCK 64 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds union afs_dirent { 731da177e4SLinus Torvalds struct { 741da177e4SLinus Torvalds uint8_t valid; 751da177e4SLinus Torvalds uint8_t unused[1]; 761da177e4SLinus Torvalds __be16 hash_next; 771da177e4SLinus Torvalds __be32 vnode; 781da177e4SLinus Torvalds __be32 unique; 791da177e4SLinus Torvalds uint8_t name[16]; 801da177e4SLinus Torvalds uint8_t overflow[4]; /* if any char of the name (inc 811da177e4SLinus Torvalds * NUL) reaches here, consume 821da177e4SLinus Torvalds * the next dirent too */ 831da177e4SLinus Torvalds } u; 841da177e4SLinus Torvalds uint8_t extended_name[32]; 851da177e4SLinus Torvalds }; 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ 881da177e4SLinus Torvalds struct afs_dir_pagehdr { 891da177e4SLinus Torvalds __be16 npages; 901da177e4SLinus Torvalds __be16 magic; 911da177e4SLinus Torvalds #define AFS_DIR_MAGIC htons(1234) 921da177e4SLinus Torvalds uint8_t nentries; 931da177e4SLinus Torvalds uint8_t bitmap[8]; 941da177e4SLinus Torvalds uint8_t pad[19]; 951da177e4SLinus Torvalds }; 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds /* directory block layout */ 981da177e4SLinus Torvalds union afs_dir_block { 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds struct { 1031da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1041da177e4SLinus Torvalds uint8_t alloc_ctrs[128]; 1051da177e4SLinus Torvalds /* dir hash table */ 1061da177e4SLinus Torvalds uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; 1071da177e4SLinus Torvalds } hdr; 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; 1101da177e4SLinus Torvalds }; 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds /* layout on a linux VM page */ 1131da177e4SLinus Torvalds struct afs_dir_page { 1141da177e4SLinus Torvalds union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; 1151da177e4SLinus Torvalds }; 1161da177e4SLinus Torvalds 117260a9803SDavid Howells struct afs_lookup_cookie { 1181da177e4SLinus Torvalds struct afs_fid fid; 1191da177e4SLinus Torvalds const char *name; 1201da177e4SLinus Torvalds size_t nlen; 1211da177e4SLinus Torvalds int found; 1221da177e4SLinus Torvalds }; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds /* 1251da177e4SLinus Torvalds * check that a directory page is valid 1261da177e4SLinus Torvalds */ 1271da177e4SLinus Torvalds static inline void afs_dir_check_page(struct inode *dir, struct page *page) 1281da177e4SLinus Torvalds { 1291da177e4SLinus Torvalds struct afs_dir_page *dbuf; 1301da177e4SLinus Torvalds loff_t latter; 1311da177e4SLinus Torvalds int tmp, qty; 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds #if 0 1341da177e4SLinus Torvalds /* check the page count */ 1351da177e4SLinus Torvalds qty = desc.size / sizeof(dbuf->blocks[0]); 1361da177e4SLinus Torvalds if (qty == 0) 1371da177e4SLinus Torvalds goto error; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { 1401da177e4SLinus Torvalds printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", 14108e0e7c8SDavid Howells __FUNCTION__, dir->i_ino, qty, 14208e0e7c8SDavid Howells ntohs(dbuf->blocks[0].pagehdr.npages)); 1431da177e4SLinus Torvalds goto error; 1441da177e4SLinus Torvalds } 1451da177e4SLinus Torvalds #endif 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds /* determine how many magic numbers there should be in this page */ 14854b21a79SAndrew Morton latter = dir->i_size - page_offset(page); 1491da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1501da177e4SLinus Torvalds qty = PAGE_SIZE; 1511da177e4SLinus Torvalds else 1521da177e4SLinus Torvalds qty = latter; 1531da177e4SLinus Torvalds qty /= sizeof(union afs_dir_block); 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds /* check them */ 1561da177e4SLinus Torvalds dbuf = page_address(page); 1571da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 1581da177e4SLinus Torvalds if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { 1591da177e4SLinus Torvalds printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n", 1601da177e4SLinus Torvalds __FUNCTION__, dir->i_ino, tmp, qty, 1611da177e4SLinus Torvalds ntohs(dbuf->blocks[tmp].pagehdr.magic)); 1621da177e4SLinus Torvalds goto error; 1631da177e4SLinus Torvalds } 1641da177e4SLinus Torvalds } 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds SetPageChecked(page); 1671da177e4SLinus Torvalds return; 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds error: 1701da177e4SLinus Torvalds SetPageChecked(page); 1711da177e4SLinus Torvalds SetPageError(page); 172ec26815aSDavid Howells } 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds /* 1751da177e4SLinus Torvalds * discard a page cached in the pagecache 1761da177e4SLinus Torvalds */ 1771da177e4SLinus Torvalds static inline void afs_dir_put_page(struct page *page) 1781da177e4SLinus Torvalds { 1791da177e4SLinus Torvalds kunmap(page); 1801da177e4SLinus Torvalds page_cache_release(page); 181ec26815aSDavid Howells } 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds /* 1841da177e4SLinus Torvalds * get a page into the pagecache 1851da177e4SLinus Torvalds */ 18600d3b7a4SDavid Howells static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, 18700d3b7a4SDavid Howells struct key *key) 1881da177e4SLinus Torvalds { 1891da177e4SLinus Torvalds struct page *page; 19000d3b7a4SDavid Howells struct file file = { 19100d3b7a4SDavid Howells .private_data = key, 19200d3b7a4SDavid Howells }; 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds _enter("{%lu},%lu", dir->i_ino, index); 1951da177e4SLinus Torvalds 19600d3b7a4SDavid Howells page = read_mapping_page(dir->i_mapping, index, &file); 1971da177e4SLinus Torvalds if (!IS_ERR(page)) { 1981da177e4SLinus Torvalds kmap(page); 1991da177e4SLinus Torvalds if (!PageChecked(page)) 2001da177e4SLinus Torvalds afs_dir_check_page(dir, page); 2011da177e4SLinus Torvalds if (PageError(page)) 2021da177e4SLinus Torvalds goto fail; 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds return page; 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds fail: 2071da177e4SLinus Torvalds afs_dir_put_page(page); 20808e0e7c8SDavid Howells _leave(" = -EIO"); 2091da177e4SLinus Torvalds return ERR_PTR(-EIO); 210ec26815aSDavid Howells } 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds /* 2131da177e4SLinus Torvalds * open an AFS directory file 2141da177e4SLinus Torvalds */ 2151da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 2161da177e4SLinus Torvalds { 2171da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 2181da177e4SLinus Torvalds 2192ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 2202ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 2211da177e4SLinus Torvalds 22208e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2231da177e4SLinus Torvalds return -ENOENT; 2241da177e4SLinus Torvalds 22500d3b7a4SDavid Howells return afs_open(inode, file); 226ec26815aSDavid Howells } 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds /* 2291da177e4SLinus Torvalds * deal with one block in an AFS directory 2301da177e4SLinus Torvalds */ 2311da177e4SLinus Torvalds static int afs_dir_iterate_block(unsigned *fpos, 2321da177e4SLinus Torvalds union afs_dir_block *block, 2331da177e4SLinus Torvalds unsigned blkoff, 2341da177e4SLinus Torvalds void *cookie, 2351da177e4SLinus Torvalds filldir_t filldir) 2361da177e4SLinus Torvalds { 2371da177e4SLinus Torvalds union afs_dirent *dire; 2381da177e4SLinus Torvalds unsigned offset, next, curr; 2391da177e4SLinus Torvalds size_t nlen; 2401da177e4SLinus Torvalds int tmp, ret; 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds _enter("%u,%x,%p,,",*fpos,blkoff,block); 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds curr = (*fpos - blkoff) / sizeof(union afs_dirent); 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 2471da177e4SLinus Torvalds for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; 2481da177e4SLinus Torvalds offset < AFS_DIRENT_PER_BLOCK; 2491da177e4SLinus Torvalds offset = next 2501da177e4SLinus Torvalds ) { 2511da177e4SLinus Torvalds next = offset + 1; 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 2541da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[offset / 8] & 2551da177e4SLinus Torvalds (1 << (offset % 8)))) { 25608e0e7c8SDavid Howells _debug("ENT[%Zu.%u]: unused", 2571da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset); 2581da177e4SLinus Torvalds if (offset >= curr) 2591da177e4SLinus Torvalds *fpos = blkoff + 2601da177e4SLinus Torvalds next * sizeof(union afs_dirent); 2611da177e4SLinus Torvalds continue; 2621da177e4SLinus Torvalds } 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds /* got a valid entry */ 2651da177e4SLinus Torvalds dire = &block->dirents[offset]; 2661da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 2671da177e4SLinus Torvalds sizeof(*block) - 2681da177e4SLinus Torvalds offset * sizeof(union afs_dirent)); 2691da177e4SLinus Torvalds 27008e0e7c8SDavid Howells _debug("ENT[%Zu.%u]: %s %Zu \"%s\"", 2711da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset, 2721da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 2731da177e4SLinus Torvalds nlen, dire->u.name); 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds /* work out where the next possible entry is */ 2761da177e4SLinus Torvalds for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { 2771da177e4SLinus Torvalds if (next >= AFS_DIRENT_PER_BLOCK) { 2781da177e4SLinus Torvalds _debug("ENT[%Zu.%u]:" 2791da177e4SLinus Torvalds " %u travelled beyond end dir block" 28008e0e7c8SDavid Howells " (len %u/%Zu)", 2811da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 2821da177e4SLinus Torvalds offset, next, tmp, nlen); 2831da177e4SLinus Torvalds return -EIO; 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[next / 8] & 2861da177e4SLinus Torvalds (1 << (next % 8)))) { 2871da177e4SLinus Torvalds _debug("ENT[%Zu.%u]:" 28808e0e7c8SDavid Howells " %u unmarked extension (len %u/%Zu)", 2891da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 2901da177e4SLinus Torvalds offset, next, tmp, nlen); 2911da177e4SLinus Torvalds return -EIO; 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds 29408e0e7c8SDavid Howells _debug("ENT[%Zu.%u]: ext %u/%Zu", 2951da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 2961da177e4SLinus Torvalds next, tmp, nlen); 2971da177e4SLinus Torvalds next++; 2981da177e4SLinus Torvalds } 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds /* skip if starts before the current position */ 3011da177e4SLinus Torvalds if (offset < curr) 3021da177e4SLinus Torvalds continue; 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds /* found the next entry */ 3051da177e4SLinus Torvalds ret = filldir(cookie, 3061da177e4SLinus Torvalds dire->u.name, 3071da177e4SLinus Torvalds nlen, 3081da177e4SLinus Torvalds blkoff + offset * sizeof(union afs_dirent), 3091da177e4SLinus Torvalds ntohl(dire->u.vnode), 310260a9803SDavid Howells filldir == afs_lookup_filldir ? 3111da177e4SLinus Torvalds ntohl(dire->u.unique) : DT_UNKNOWN); 3121da177e4SLinus Torvalds if (ret < 0) { 3131da177e4SLinus Torvalds _leave(" = 0 [full]"); 3141da177e4SLinus Torvalds return 0; 3151da177e4SLinus Torvalds } 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvalds *fpos = blkoff + next * sizeof(union afs_dirent); 3181da177e4SLinus Torvalds } 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds _leave(" = 1 [more]"); 3211da177e4SLinus Torvalds return 1; 322ec26815aSDavid Howells } 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds /* 32508e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 3261da177e4SLinus Torvalds */ 3271da177e4SLinus Torvalds static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie, 32800d3b7a4SDavid Howells filldir_t filldir, struct key *key) 3291da177e4SLinus Torvalds { 3301da177e4SLinus Torvalds union afs_dir_block *dblock; 3311da177e4SLinus Torvalds struct afs_dir_page *dbuf; 3321da177e4SLinus Torvalds struct page *page; 3331da177e4SLinus Torvalds unsigned blkoff, limit; 3341da177e4SLinus Torvalds int ret; 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds _enter("{%lu},%u,,", dir->i_ino, *fpos); 3371da177e4SLinus Torvalds 33808e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 3391da177e4SLinus Torvalds _leave(" = -ESTALE"); 3401da177e4SLinus Torvalds return -ESTALE; 3411da177e4SLinus Torvalds } 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 3441da177e4SLinus Torvalds *fpos += sizeof(union afs_dirent) - 1; 3451da177e4SLinus Torvalds *fpos &= ~(sizeof(union afs_dirent) - 1); 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds /* walk through the blocks in sequence */ 3481da177e4SLinus Torvalds ret = 0; 3491da177e4SLinus Torvalds while (*fpos < dir->i_size) { 3501da177e4SLinus Torvalds blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1); 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds /* fetch the appropriate page from the directory */ 35300d3b7a4SDavid Howells page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); 3541da177e4SLinus Torvalds if (IS_ERR(page)) { 3551da177e4SLinus Torvalds ret = PTR_ERR(page); 3561da177e4SLinus Torvalds break; 3571da177e4SLinus Torvalds } 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds dbuf = page_address(page); 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 3641da177e4SLinus Torvalds do { 3651da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 3661da177e4SLinus Torvalds sizeof(union afs_dir_block)]; 3671da177e4SLinus Torvalds ret = afs_dir_iterate_block(fpos, dblock, blkoff, 3681da177e4SLinus Torvalds cookie, filldir); 3691da177e4SLinus Torvalds if (ret != 1) { 3701da177e4SLinus Torvalds afs_dir_put_page(page); 3711da177e4SLinus Torvalds goto out; 3721da177e4SLinus Torvalds } 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds blkoff += sizeof(union afs_dir_block); 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds } while (*fpos < dir->i_size && blkoff < limit); 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds afs_dir_put_page(page); 3791da177e4SLinus Torvalds ret = 0; 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds out: 3831da177e4SLinus Torvalds _leave(" = %d", ret); 3841da177e4SLinus Torvalds return ret; 385ec26815aSDavid Howells } 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds /* 3881da177e4SLinus Torvalds * read an AFS directory 3891da177e4SLinus Torvalds */ 390260a9803SDavid Howells static int afs_readdir(struct file *file, void *cookie, filldir_t filldir) 3911da177e4SLinus Torvalds { 3921da177e4SLinus Torvalds unsigned fpos; 3931da177e4SLinus Torvalds int ret; 3941da177e4SLinus Torvalds 39508e0e7c8SDavid Howells _enter("{%Ld,{%lu}}", 39608e0e7c8SDavid Howells file->f_pos, file->f_path.dentry->d_inode->i_ino); 3971da177e4SLinus Torvalds 39800d3b7a4SDavid Howells ASSERT(file->private_data != NULL); 39900d3b7a4SDavid Howells 4001da177e4SLinus Torvalds fpos = file->f_pos; 40108e0e7c8SDavid Howells ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos, 40200d3b7a4SDavid Howells cookie, filldir, file->private_data); 4031da177e4SLinus Torvalds file->f_pos = fpos; 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds _leave(" = %d", ret); 4061da177e4SLinus Torvalds return ret; 407ec26815aSDavid Howells } 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds /* 4101da177e4SLinus Torvalds * search the directory for a name 4111da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 4121da177e4SLinus Torvalds * uniquifier through dtype 4131da177e4SLinus Torvalds */ 414260a9803SDavid Howells static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, 415afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype) 4161da177e4SLinus Torvalds { 417260a9803SDavid Howells struct afs_lookup_cookie *cookie = _cookie; 4181da177e4SLinus Torvalds 41908e0e7c8SDavid Howells _enter("{%s,%Zu},%s,%u,,%llu,%u", 420ba3e0e1aSDavid S. Miller cookie->name, cookie->nlen, name, nlen, 421ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 4221da177e4SLinus Torvalds 42308e0e7c8SDavid Howells /* insanity checks first */ 42408e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 42508e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 42608e0e7c8SDavid Howells 4271da177e4SLinus Torvalds if (cookie->nlen != nlen || memcmp(cookie->name, name, nlen) != 0) { 4281da177e4SLinus Torvalds _leave(" = 0 [no]"); 4291da177e4SLinus Torvalds return 0; 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds cookie->fid.vnode = ino; 4331da177e4SLinus Torvalds cookie->fid.unique = dtype; 4341da177e4SLinus Torvalds cookie->found = 1; 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds _leave(" = -1 [found]"); 4371da177e4SLinus Torvalds return -1; 438ec26815aSDavid Howells } 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds /* 44108e0e7c8SDavid Howells * do a lookup in a directory 442260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 4431da177e4SLinus Torvalds */ 44408e0e7c8SDavid Howells static int afs_do_lookup(struct inode *dir, struct dentry *dentry, 44500d3b7a4SDavid Howells struct afs_fid *fid, struct key *key) 4461da177e4SLinus Torvalds { 447260a9803SDavid Howells struct afs_lookup_cookie cookie; 4481da177e4SLinus Torvalds struct afs_super_info *as; 4491da177e4SLinus Torvalds unsigned fpos; 4501da177e4SLinus Torvalds int ret; 4511da177e4SLinus Torvalds 45208e0e7c8SDavid Howells _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name); 4531da177e4SLinus Torvalds 4541da177e4SLinus Torvalds as = dir->i_sb->s_fs_info; 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds /* search the directory */ 4571da177e4SLinus Torvalds cookie.name = dentry->d_name.name; 4581da177e4SLinus Torvalds cookie.nlen = dentry->d_name.len; 4591da177e4SLinus Torvalds cookie.fid.vid = as->volume->vid; 4601da177e4SLinus Torvalds cookie.found = 0; 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds fpos = 0; 463260a9803SDavid Howells ret = afs_dir_iterate(dir, &fpos, &cookie, afs_lookup_filldir, 46400d3b7a4SDavid Howells key); 4651da177e4SLinus Torvalds if (ret < 0) { 46608e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 46708e0e7c8SDavid Howells return ret; 4681da177e4SLinus Torvalds } 4691da177e4SLinus Torvalds 4701da177e4SLinus Torvalds ret = -ENOENT; 4711da177e4SLinus Torvalds if (!cookie.found) { 47208e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 47308e0e7c8SDavid Howells return -ENOENT; 47408e0e7c8SDavid Howells } 47508e0e7c8SDavid Howells 47608e0e7c8SDavid Howells *fid = cookie.fid; 47708e0e7c8SDavid Howells _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); 47808e0e7c8SDavid Howells return 0; 47908e0e7c8SDavid Howells } 48008e0e7c8SDavid Howells 48108e0e7c8SDavid Howells /* 48208e0e7c8SDavid Howells * look up an entry in a directory 48308e0e7c8SDavid Howells */ 484260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 48508e0e7c8SDavid Howells struct nameidata *nd) 48608e0e7c8SDavid Howells { 48708e0e7c8SDavid Howells struct afs_vnode *vnode; 48808e0e7c8SDavid Howells struct afs_fid fid; 48908e0e7c8SDavid Howells struct inode *inode; 49000d3b7a4SDavid Howells struct key *key; 49108e0e7c8SDavid Howells int ret; 49208e0e7c8SDavid Howells 493260a9803SDavid Howells vnode = AFS_FS_I(dir); 494260a9803SDavid Howells 495416351f2SDavid Howells _enter("{%x:%u},%p{%s},", 496260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name); 497260a9803SDavid Howells 498260a9803SDavid Howells ASSERTCMP(dentry->d_inode, ==, NULL); 49908e0e7c8SDavid Howells 50045222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 50108e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 50208e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 50308e0e7c8SDavid Howells } 50408e0e7c8SDavid Howells 50508e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 50608e0e7c8SDavid Howells _leave(" = -ESTALE"); 50708e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 50808e0e7c8SDavid Howells } 50908e0e7c8SDavid Howells 51000d3b7a4SDavid Howells key = afs_request_key(vnode->volume->cell); 51100d3b7a4SDavid Howells if (IS_ERR(key)) { 51200d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 51300d3b7a4SDavid Howells return ERR_PTR(PTR_ERR(key)); 51400d3b7a4SDavid Howells } 51500d3b7a4SDavid Howells 516260a9803SDavid Howells ret = afs_validate(vnode, key); 51708e0e7c8SDavid Howells if (ret < 0) { 51800d3b7a4SDavid Howells key_put(key); 519260a9803SDavid Howells _leave(" = %d [val]", ret); 5201da177e4SLinus Torvalds return ERR_PTR(ret); 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds 523260a9803SDavid Howells ret = afs_do_lookup(dir, dentry, &fid, key); 524260a9803SDavid Howells if (ret < 0) { 525260a9803SDavid Howells key_put(key); 526260a9803SDavid Howells if (ret == -ENOENT) { 527260a9803SDavid Howells d_add(dentry, NULL); 528260a9803SDavid Howells _leave(" = NULL [negative]"); 529260a9803SDavid Howells return NULL; 530260a9803SDavid Howells } 531260a9803SDavid Howells _leave(" = %d [do]", ret); 532260a9803SDavid Howells return ERR_PTR(ret); 533260a9803SDavid Howells } 534260a9803SDavid Howells dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; 535260a9803SDavid Howells 5361da177e4SLinus Torvalds /* instantiate the dentry */ 537260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); 53800d3b7a4SDavid Howells key_put(key); 53908e0e7c8SDavid Howells if (IS_ERR(inode)) { 54008e0e7c8SDavid Howells _leave(" = %ld", PTR_ERR(inode)); 54108e0e7c8SDavid Howells return ERR_PTR(PTR_ERR(inode)); 5421da177e4SLinus Torvalds } 5431da177e4SLinus Torvalds 5441da177e4SLinus Torvalds dentry->d_op = &afs_fs_dentry_operations; 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds d_add(dentry, inode); 5471da177e4SLinus Torvalds _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%lu }", 54808e0e7c8SDavid Howells fid.vnode, 54908e0e7c8SDavid Howells fid.unique, 5501da177e4SLinus Torvalds dentry->d_inode->i_ino, 5511da177e4SLinus Torvalds dentry->d_inode->i_version); 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds return NULL; 554ec26815aSDavid Howells } 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds /* 5571da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 5581da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 5591da177e4SLinus Torvalds * inode 5601da177e4SLinus Torvalds */ 5611da177e4SLinus Torvalds static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd) 5621da177e4SLinus Torvalds { 563260a9803SDavid Howells struct afs_vnode *vnode, *dir; 56408e0e7c8SDavid Howells struct afs_fid fid; 5651da177e4SLinus Torvalds struct dentry *parent; 56600d3b7a4SDavid Howells struct key *key; 567260a9803SDavid Howells void *dir_version; 5681da177e4SLinus Torvalds int ret; 5691da177e4SLinus Torvalds 57008e0e7c8SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 57108e0e7c8SDavid Howells 572260a9803SDavid Howells if (dentry->d_inode) 573260a9803SDavid Howells _enter("{v={%x:%u} n=%s fl=%lx},", 574260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name, 575260a9803SDavid Howells vnode->flags); 576260a9803SDavid Howells else 577260a9803SDavid Howells _enter("{neg n=%s}", dentry->d_name.name); 5781da177e4SLinus Torvalds 579260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 58000d3b7a4SDavid Howells if (IS_ERR(key)) 58100d3b7a4SDavid Howells key = NULL; 58200d3b7a4SDavid Howells 5831da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 58408e0e7c8SDavid Howells parent = dget_parent(dentry); 585260a9803SDavid Howells if (!parent->d_inode) 5861da177e4SLinus Torvalds goto out_bad; 5871da177e4SLinus Torvalds 588260a9803SDavid Howells dir = AFS_FS_I(parent->d_inode); 5891da177e4SLinus Torvalds 590260a9803SDavid Howells /* validate the parent directory */ 591260a9803SDavid Howells if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) 592260a9803SDavid Howells afs_validate(dir, key); 593260a9803SDavid Howells 594260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 5951da177e4SLinus Torvalds _debug("%s: parent dir deleted", dentry->d_name.name); 5961da177e4SLinus Torvalds goto out_bad; 5971da177e4SLinus Torvalds } 5981da177e4SLinus Torvalds 599260a9803SDavid Howells dir_version = (void *) (unsigned long) dir->status.data_version; 600260a9803SDavid Howells if (dentry->d_fsdata == dir_version) 601260a9803SDavid Howells goto out_valid; /* the dir contents are unchanged */ 602260a9803SDavid Howells 60308e0e7c8SDavid Howells _debug("dir modified"); 6041da177e4SLinus Torvalds 6051da177e4SLinus Torvalds /* search the directory for this vnode */ 606260a9803SDavid Howells ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); 607260a9803SDavid Howells switch (ret) { 608260a9803SDavid Howells case 0: 609260a9803SDavid Howells /* the filename maps to something */ 610260a9803SDavid Howells if (!dentry->d_inode) 611260a9803SDavid Howells goto out_bad; 612260a9803SDavid Howells if (is_bad_inode(dentry->d_inode)) { 613260a9803SDavid Howells printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n", 614260a9803SDavid Howells parent->d_name.name, dentry->d_name.name); 6151da177e4SLinus Torvalds goto out_bad; 6161da177e4SLinus Torvalds } 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 6191da177e4SLinus Torvalds * different file */ 62008e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 62108e0e7c8SDavid Howells _debug("%s: dirent changed [%u != %u]", 62208e0e7c8SDavid Howells dentry->d_name.name, fid.vnode, 62308e0e7c8SDavid Howells vnode->fid.vnode); 6241da177e4SLinus Torvalds goto not_found; 6251da177e4SLinus Torvalds } 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 628260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 629260a9803SDavid Howells * been reused */ 63008e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 6311da177e4SLinus Torvalds _debug("%s: file deleted (uq %u -> %u I:%lu)", 63208e0e7c8SDavid Howells dentry->d_name.name, fid.unique, 633260a9803SDavid Howells vnode->fid.unique, dentry->d_inode->i_version); 63408e0e7c8SDavid Howells spin_lock(&vnode->lock); 63508e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 63608e0e7c8SDavid Howells spin_unlock(&vnode->lock); 637260a9803SDavid Howells goto not_found; 638260a9803SDavid Howells } 639260a9803SDavid Howells goto out_valid; 640260a9803SDavid Howells 641260a9803SDavid Howells case -ENOENT: 642260a9803SDavid Howells /* the filename is unknown */ 643260a9803SDavid Howells _debug("%s: dirent not found", dentry->d_name.name); 644260a9803SDavid Howells if (dentry->d_inode) 645260a9803SDavid Howells goto not_found; 646260a9803SDavid Howells goto out_valid; 647260a9803SDavid Howells 648260a9803SDavid Howells default: 649260a9803SDavid Howells _debug("failed to iterate dir %s: %d", 650260a9803SDavid Howells parent->d_name.name, ret); 6511da177e4SLinus Torvalds goto out_bad; 6521da177e4SLinus Torvalds } 65308e0e7c8SDavid Howells 6541da177e4SLinus Torvalds out_valid: 655260a9803SDavid Howells dentry->d_fsdata = dir_version; 656260a9803SDavid Howells out_skip: 6571da177e4SLinus Torvalds dput(parent); 65800d3b7a4SDavid Howells key_put(key); 6591da177e4SLinus Torvalds _leave(" = 1 [valid]"); 6601da177e4SLinus Torvalds return 1; 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 6631da177e4SLinus Torvalds not_found: 6641da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 6651da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 6661da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds out_bad: 669260a9803SDavid Howells if (dentry->d_inode) { 6701da177e4SLinus Torvalds /* don't unhash if we have submounts */ 6711da177e4SLinus Torvalds if (have_submounts(dentry)) 672260a9803SDavid Howells goto out_skip; 6731da177e4SLinus Torvalds } 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds _debug("dropping dentry %s/%s", 67608e0e7c8SDavid Howells parent->d_name.name, dentry->d_name.name); 67708e0e7c8SDavid Howells shrink_dcache_parent(dentry); 6781da177e4SLinus Torvalds d_drop(dentry); 6791da177e4SLinus Torvalds dput(parent); 68000d3b7a4SDavid Howells key_put(key); 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds _leave(" = 0 [bad]"); 6831da177e4SLinus Torvalds return 0; 684ec26815aSDavid Howells } 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds /* 6871da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 6881da177e4SLinus Torvalds * sleep) 6891da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 6901da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 6911da177e4SLinus Torvalds */ 6921da177e4SLinus Torvalds static int afs_d_delete(struct dentry *dentry) 6931da177e4SLinus Torvalds { 6941da177e4SLinus Torvalds _enter("%s", dentry->d_name.name); 6951da177e4SLinus Torvalds 6961da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 6971da177e4SLinus Torvalds goto zap; 6981da177e4SLinus Torvalds 69908e0e7c8SDavid Howells if (dentry->d_inode && 70008e0e7c8SDavid Howells test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags)) 7011da177e4SLinus Torvalds goto zap; 7021da177e4SLinus Torvalds 7031da177e4SLinus Torvalds _leave(" = 0 [keep]"); 7041da177e4SLinus Torvalds return 0; 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds zap: 7071da177e4SLinus Torvalds _leave(" = 1 [zap]"); 7081da177e4SLinus Torvalds return 1; 709ec26815aSDavid Howells } 710260a9803SDavid Howells 711260a9803SDavid Howells /* 712260a9803SDavid Howells * handle dentry release 713260a9803SDavid Howells */ 714260a9803SDavid Howells static void afs_d_release(struct dentry *dentry) 715260a9803SDavid Howells { 716260a9803SDavid Howells _enter("%s", dentry->d_name.name); 717260a9803SDavid Howells } 718260a9803SDavid Howells 719260a9803SDavid Howells /* 720260a9803SDavid Howells * create a directory on an AFS filesystem 721260a9803SDavid Howells */ 722260a9803SDavid Howells static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 723260a9803SDavid Howells { 724260a9803SDavid Howells struct afs_file_status status; 725260a9803SDavid Howells struct afs_callback cb; 726260a9803SDavid Howells struct afs_server *server; 727260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 728260a9803SDavid Howells struct afs_fid fid; 729260a9803SDavid Howells struct inode *inode; 730260a9803SDavid Howells struct key *key; 731260a9803SDavid Howells int ret; 732260a9803SDavid Howells 733260a9803SDavid Howells dvnode = AFS_FS_I(dir); 734260a9803SDavid Howells 735416351f2SDavid Howells _enter("{%x:%u},{%s},%o", 736260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 737260a9803SDavid Howells 738260a9803SDavid Howells ret = -ENAMETOOLONG; 73945222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 740260a9803SDavid Howells goto error; 741260a9803SDavid Howells 742260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 743260a9803SDavid Howells if (IS_ERR(key)) { 744260a9803SDavid Howells ret = PTR_ERR(key); 745260a9803SDavid Howells goto error; 746260a9803SDavid Howells } 747260a9803SDavid Howells 748260a9803SDavid Howells mode |= S_IFDIR; 749260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 750260a9803SDavid Howells mode, &fid, &status, &cb, &server); 751260a9803SDavid Howells if (ret < 0) 752260a9803SDavid Howells goto mkdir_error; 753260a9803SDavid Howells 754260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 755260a9803SDavid Howells if (IS_ERR(inode)) { 756260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 757260a9803SDavid Howells * directory on the server */ 758260a9803SDavid Howells ret = PTR_ERR(inode); 759260a9803SDavid Howells goto iget_error; 760260a9803SDavid Howells } 761260a9803SDavid Howells 762260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 763260a9803SDavid Howells vnode = AFS_FS_I(inode); 764260a9803SDavid Howells spin_lock(&vnode->lock); 765260a9803SDavid Howells vnode->update_cnt++; 766260a9803SDavid Howells spin_unlock(&vnode->lock); 767260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 768260a9803SDavid Howells afs_put_server(server); 769260a9803SDavid Howells 770260a9803SDavid Howells d_instantiate(dentry, inode); 771260a9803SDavid Howells if (d_unhashed(dentry)) { 772260a9803SDavid Howells _debug("not hashed"); 773260a9803SDavid Howells d_rehash(dentry); 774260a9803SDavid Howells } 775260a9803SDavid Howells key_put(key); 776260a9803SDavid Howells _leave(" = 0"); 777260a9803SDavid Howells return 0; 778260a9803SDavid Howells 779260a9803SDavid Howells iget_error: 780260a9803SDavid Howells afs_put_server(server); 781260a9803SDavid Howells mkdir_error: 782260a9803SDavid Howells key_put(key); 783260a9803SDavid Howells error: 784260a9803SDavid Howells d_drop(dentry); 785260a9803SDavid Howells _leave(" = %d", ret); 786260a9803SDavid Howells return ret; 787260a9803SDavid Howells } 788260a9803SDavid Howells 789260a9803SDavid Howells /* 790260a9803SDavid Howells * remove a directory from an AFS filesystem 791260a9803SDavid Howells */ 792260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 793260a9803SDavid Howells { 794260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 795260a9803SDavid Howells struct key *key; 796260a9803SDavid Howells int ret; 797260a9803SDavid Howells 798260a9803SDavid Howells dvnode = AFS_FS_I(dir); 799260a9803SDavid Howells 800416351f2SDavid Howells _enter("{%x:%u},{%s}", 801260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 802260a9803SDavid Howells 803260a9803SDavid Howells ret = -ENAMETOOLONG; 80445222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 805260a9803SDavid Howells goto error; 806260a9803SDavid Howells 807260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 808260a9803SDavid Howells if (IS_ERR(key)) { 809260a9803SDavid Howells ret = PTR_ERR(key); 810260a9803SDavid Howells goto error; 811260a9803SDavid Howells } 812260a9803SDavid Howells 813260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); 814260a9803SDavid Howells if (ret < 0) 815260a9803SDavid Howells goto rmdir_error; 816260a9803SDavid Howells 817260a9803SDavid Howells if (dentry->d_inode) { 818260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 819260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 820260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 821260a9803SDavid Howells afs_discard_callback_on_delete(vnode); 822260a9803SDavid Howells } 823260a9803SDavid Howells 824260a9803SDavid Howells key_put(key); 825260a9803SDavid Howells _leave(" = 0"); 826260a9803SDavid Howells return 0; 827260a9803SDavid Howells 828260a9803SDavid Howells rmdir_error: 829260a9803SDavid Howells key_put(key); 830260a9803SDavid Howells error: 831260a9803SDavid Howells _leave(" = %d", ret); 832260a9803SDavid Howells return ret; 833260a9803SDavid Howells } 834260a9803SDavid Howells 835260a9803SDavid Howells /* 836260a9803SDavid Howells * remove a file from an AFS filesystem 837260a9803SDavid Howells */ 838260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 839260a9803SDavid Howells { 840260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 841260a9803SDavid Howells struct key *key; 842260a9803SDavid Howells int ret; 843260a9803SDavid Howells 844260a9803SDavid Howells dvnode = AFS_FS_I(dir); 845260a9803SDavid Howells 846416351f2SDavid Howells _enter("{%x:%u},{%s}", 847260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 848260a9803SDavid Howells 849260a9803SDavid Howells ret = -ENAMETOOLONG; 85045222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 851260a9803SDavid Howells goto error; 852260a9803SDavid Howells 853260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 854260a9803SDavid Howells if (IS_ERR(key)) { 855260a9803SDavid Howells ret = PTR_ERR(key); 856260a9803SDavid Howells goto error; 857260a9803SDavid Howells } 858260a9803SDavid Howells 859260a9803SDavid Howells if (dentry->d_inode) { 860260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 861260a9803SDavid Howells 862260a9803SDavid Howells /* make sure we have a callback promise on the victim */ 863260a9803SDavid Howells ret = afs_validate(vnode, key); 864260a9803SDavid Howells if (ret < 0) 865260a9803SDavid Howells goto error; 866260a9803SDavid Howells } 867260a9803SDavid Howells 868260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); 869260a9803SDavid Howells if (ret < 0) 870260a9803SDavid Howells goto remove_error; 871260a9803SDavid Howells 872260a9803SDavid Howells if (dentry->d_inode) { 873260a9803SDavid Howells /* if the file wasn't deleted due to excess hard links, the 874260a9803SDavid Howells * fileserver will break the callback promise on the file - if 875260a9803SDavid Howells * it had one - before it returns to us, and if it was deleted, 876260a9803SDavid Howells * it won't 877260a9803SDavid Howells * 878260a9803SDavid Howells * however, if we didn't have a callback promise outstanding, 879260a9803SDavid Howells * or it was outstanding on a different server, then it won't 880260a9803SDavid Howells * break it either... 881260a9803SDavid Howells */ 882260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 883260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 884260a9803SDavid Howells _debug("AFS_VNODE_DELETED"); 885260a9803SDavid Howells if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) 886260a9803SDavid Howells _debug("AFS_VNODE_CB_BROKEN"); 887260a9803SDavid Howells set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); 888260a9803SDavid Howells ret = afs_validate(vnode, key); 889260a9803SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 890260a9803SDavid Howells } 891260a9803SDavid Howells 892260a9803SDavid Howells key_put(key); 893260a9803SDavid Howells _leave(" = 0"); 894260a9803SDavid Howells return 0; 895260a9803SDavid Howells 896260a9803SDavid Howells remove_error: 897260a9803SDavid Howells key_put(key); 898260a9803SDavid Howells error: 899260a9803SDavid Howells _leave(" = %d", ret); 900260a9803SDavid Howells return ret; 901260a9803SDavid Howells } 902260a9803SDavid Howells 903260a9803SDavid Howells /* 904260a9803SDavid Howells * create a regular file on an AFS filesystem 905260a9803SDavid Howells */ 906260a9803SDavid Howells static int afs_create(struct inode *dir, struct dentry *dentry, int mode, 907260a9803SDavid Howells struct nameidata *nd) 908260a9803SDavid Howells { 909260a9803SDavid Howells struct afs_file_status status; 910260a9803SDavid Howells struct afs_callback cb; 911260a9803SDavid Howells struct afs_server *server; 912260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 913260a9803SDavid Howells struct afs_fid fid; 914260a9803SDavid Howells struct inode *inode; 915260a9803SDavid Howells struct key *key; 916260a9803SDavid Howells int ret; 917260a9803SDavid Howells 918260a9803SDavid Howells dvnode = AFS_FS_I(dir); 919260a9803SDavid Howells 920416351f2SDavid Howells _enter("{%x:%u},{%s},%o,", 921260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 922260a9803SDavid Howells 923260a9803SDavid Howells ret = -ENAMETOOLONG; 92445222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 925260a9803SDavid Howells goto error; 926260a9803SDavid Howells 927260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 928260a9803SDavid Howells if (IS_ERR(key)) { 929260a9803SDavid Howells ret = PTR_ERR(key); 930260a9803SDavid Howells goto error; 931260a9803SDavid Howells } 932260a9803SDavid Howells 933260a9803SDavid Howells mode |= S_IFREG; 934260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 935260a9803SDavid Howells mode, &fid, &status, &cb, &server); 936260a9803SDavid Howells if (ret < 0) 937260a9803SDavid Howells goto create_error; 938260a9803SDavid Howells 939260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 940260a9803SDavid Howells if (IS_ERR(inode)) { 941260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 942260a9803SDavid Howells * directory on the server */ 943260a9803SDavid Howells ret = PTR_ERR(inode); 944260a9803SDavid Howells goto iget_error; 945260a9803SDavid Howells } 946260a9803SDavid Howells 947260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 948260a9803SDavid Howells vnode = AFS_FS_I(inode); 949260a9803SDavid Howells spin_lock(&vnode->lock); 950260a9803SDavid Howells vnode->update_cnt++; 951260a9803SDavid Howells spin_unlock(&vnode->lock); 952260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 953260a9803SDavid Howells afs_put_server(server); 954260a9803SDavid Howells 955260a9803SDavid Howells d_instantiate(dentry, inode); 956260a9803SDavid Howells if (d_unhashed(dentry)) { 957260a9803SDavid Howells _debug("not hashed"); 958260a9803SDavid Howells d_rehash(dentry); 959260a9803SDavid Howells } 960260a9803SDavid Howells key_put(key); 961260a9803SDavid Howells _leave(" = 0"); 962260a9803SDavid Howells return 0; 963260a9803SDavid Howells 964260a9803SDavid Howells iget_error: 965260a9803SDavid Howells afs_put_server(server); 966260a9803SDavid Howells create_error: 967260a9803SDavid Howells key_put(key); 968260a9803SDavid Howells error: 969260a9803SDavid Howells d_drop(dentry); 970260a9803SDavid Howells _leave(" = %d", ret); 971260a9803SDavid Howells return ret; 972260a9803SDavid Howells } 973260a9803SDavid Howells 974260a9803SDavid Howells /* 975260a9803SDavid Howells * create a hard link between files in an AFS filesystem 976260a9803SDavid Howells */ 977260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 978260a9803SDavid Howells struct dentry *dentry) 979260a9803SDavid Howells { 980260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 981260a9803SDavid Howells struct key *key; 982260a9803SDavid Howells int ret; 983260a9803SDavid Howells 984260a9803SDavid Howells vnode = AFS_FS_I(from->d_inode); 985260a9803SDavid Howells dvnode = AFS_FS_I(dir); 986260a9803SDavid Howells 987416351f2SDavid Howells _enter("{%x:%u},{%x:%u},{%s}", 988260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 989260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 990260a9803SDavid Howells dentry->d_name.name); 991260a9803SDavid Howells 992260a9803SDavid Howells ret = -ENAMETOOLONG; 99345222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 994260a9803SDavid Howells goto error; 995260a9803SDavid Howells 996260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 997260a9803SDavid Howells if (IS_ERR(key)) { 998260a9803SDavid Howells ret = PTR_ERR(key); 999260a9803SDavid Howells goto error; 1000260a9803SDavid Howells } 1001260a9803SDavid Howells 1002260a9803SDavid Howells ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); 1003260a9803SDavid Howells if (ret < 0) 1004260a9803SDavid Howells goto link_error; 1005260a9803SDavid Howells 1006260a9803SDavid Howells atomic_inc(&vnode->vfs_inode.i_count); 1007260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1008260a9803SDavid Howells key_put(key); 1009260a9803SDavid Howells _leave(" = 0"); 1010260a9803SDavid Howells return 0; 1011260a9803SDavid Howells 1012260a9803SDavid Howells link_error: 1013260a9803SDavid Howells key_put(key); 1014260a9803SDavid Howells error: 1015260a9803SDavid Howells d_drop(dentry); 1016260a9803SDavid Howells _leave(" = %d", ret); 1017260a9803SDavid Howells return ret; 1018260a9803SDavid Howells } 1019260a9803SDavid Howells 1020260a9803SDavid Howells /* 1021260a9803SDavid Howells * create a symlink in an AFS filesystem 1022260a9803SDavid Howells */ 1023260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1024260a9803SDavid Howells const char *content) 1025260a9803SDavid Howells { 1026260a9803SDavid Howells struct afs_file_status status; 1027260a9803SDavid Howells struct afs_server *server; 1028260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1029260a9803SDavid Howells struct afs_fid fid; 1030260a9803SDavid Howells struct inode *inode; 1031260a9803SDavid Howells struct key *key; 1032260a9803SDavid Howells int ret; 1033260a9803SDavid Howells 1034260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1035260a9803SDavid Howells 1036416351f2SDavid Howells _enter("{%x:%u},{%s},%s", 1037260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, 1038260a9803SDavid Howells content); 1039260a9803SDavid Howells 1040260a9803SDavid Howells ret = -ENAMETOOLONG; 104145222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1042260a9803SDavid Howells goto error; 1043260a9803SDavid Howells 1044260a9803SDavid Howells ret = -EINVAL; 104545222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1046260a9803SDavid Howells goto error; 1047260a9803SDavid Howells 1048260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1049260a9803SDavid Howells if (IS_ERR(key)) { 1050260a9803SDavid Howells ret = PTR_ERR(key); 1051260a9803SDavid Howells goto error; 1052260a9803SDavid Howells } 1053260a9803SDavid Howells 1054260a9803SDavid Howells ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, 1055260a9803SDavid Howells &fid, &status, &server); 1056260a9803SDavid Howells if (ret < 0) 1057260a9803SDavid Howells goto create_error; 1058260a9803SDavid Howells 1059260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); 1060260a9803SDavid Howells if (IS_ERR(inode)) { 1061260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 1062260a9803SDavid Howells * directory on the server */ 1063260a9803SDavid Howells ret = PTR_ERR(inode); 1064260a9803SDavid Howells goto iget_error; 1065260a9803SDavid Howells } 1066260a9803SDavid Howells 1067260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 1068260a9803SDavid Howells vnode = AFS_FS_I(inode); 1069260a9803SDavid Howells spin_lock(&vnode->lock); 1070260a9803SDavid Howells vnode->update_cnt++; 1071260a9803SDavid Howells spin_unlock(&vnode->lock); 1072260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 1073260a9803SDavid Howells afs_put_server(server); 1074260a9803SDavid Howells 1075260a9803SDavid Howells d_instantiate(dentry, inode); 1076260a9803SDavid Howells if (d_unhashed(dentry)) { 1077260a9803SDavid Howells _debug("not hashed"); 1078260a9803SDavid Howells d_rehash(dentry); 1079260a9803SDavid Howells } 1080260a9803SDavid Howells key_put(key); 1081260a9803SDavid Howells _leave(" = 0"); 1082260a9803SDavid Howells return 0; 1083260a9803SDavid Howells 1084260a9803SDavid Howells iget_error: 1085260a9803SDavid Howells afs_put_server(server); 1086260a9803SDavid Howells create_error: 1087260a9803SDavid Howells key_put(key); 1088260a9803SDavid Howells error: 1089260a9803SDavid Howells d_drop(dentry); 1090260a9803SDavid Howells _leave(" = %d", ret); 1091260a9803SDavid Howells return ret; 1092260a9803SDavid Howells } 1093260a9803SDavid Howells 1094260a9803SDavid Howells /* 1095260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1096260a9803SDavid Howells */ 1097260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 1098260a9803SDavid Howells struct inode *new_dir, struct dentry *new_dentry) 1099260a9803SDavid Howells { 1100260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1101260a9803SDavid Howells struct key *key; 1102260a9803SDavid Howells int ret; 1103260a9803SDavid Howells 1104260a9803SDavid Howells vnode = AFS_FS_I(old_dentry->d_inode); 1105260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1106260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1107260a9803SDavid Howells 1108416351f2SDavid Howells _enter("{%x:%u},{%x:%u},{%x:%u},{%s}", 1109260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1110260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1111260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1112260a9803SDavid Howells new_dentry->d_name.name); 1113260a9803SDavid Howells 1114260a9803SDavid Howells ret = -ENAMETOOLONG; 111545222b9eSDavid Howells if (new_dentry->d_name.len >= AFSNAMEMAX) 1116260a9803SDavid Howells goto error; 1117260a9803SDavid Howells 1118260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1119260a9803SDavid Howells if (IS_ERR(key)) { 1120260a9803SDavid Howells ret = PTR_ERR(key); 1121260a9803SDavid Howells goto error; 1122260a9803SDavid Howells } 1123260a9803SDavid Howells 1124260a9803SDavid Howells ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, 1125260a9803SDavid Howells old_dentry->d_name.name, 1126260a9803SDavid Howells new_dentry->d_name.name); 1127260a9803SDavid Howells if (ret < 0) 1128260a9803SDavid Howells goto rename_error; 1129260a9803SDavid Howells key_put(key); 1130260a9803SDavid Howells _leave(" = 0"); 1131260a9803SDavid Howells return 0; 1132260a9803SDavid Howells 1133260a9803SDavid Howells rename_error: 1134260a9803SDavid Howells key_put(key); 1135260a9803SDavid Howells error: 1136260a9803SDavid Howells d_drop(new_dentry); 1137260a9803SDavid Howells _leave(" = %d", ret); 1138260a9803SDavid Howells return ret; 1139260a9803SDavid Howells } 1140