11da177e4SLinus Torvalds /* dir.c: AFS filesystem directory handling 21da177e4SLinus Torvalds * 31da177e4SLinus Torvalds * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. 41da177e4SLinus Torvalds * Written by David Howells (dhowells@redhat.com) 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 71da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 81da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 91da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds #include <linux/kernel.h> 131da177e4SLinus Torvalds #include <linux/module.h> 141da177e4SLinus Torvalds #include <linux/init.h> 151da177e4SLinus Torvalds #include <linux/fs.h> 1634286d66SNick Piggin #include <linux/namei.h> 171da177e4SLinus Torvalds #include <linux/pagemap.h> 1800d3b7a4SDavid Howells #include <linux/ctype.h> 19e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 201da177e4SLinus Torvalds #include "internal.h" 211da177e4SLinus Torvalds 22260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 231da177e4SLinus Torvalds struct nameidata *nd); 241da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file); 25260a9803SDavid Howells static int afs_readdir(struct file *file, void *dirent, filldir_t filldir); 261da177e4SLinus Torvalds static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd); 27fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry); 28260a9803SDavid Howells static void afs_d_release(struct dentry *dentry); 29260a9803SDavid Howells static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, 30afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype); 31260a9803SDavid Howells static int afs_create(struct inode *dir, struct dentry *dentry, int mode, 32260a9803SDavid Howells struct nameidata *nd); 33260a9803SDavid Howells static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode); 34260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry); 35260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry); 36260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 37260a9803SDavid Howells struct dentry *dentry); 38260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 39260a9803SDavid Howells const char *content); 40260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 41260a9803SDavid Howells struct inode *new_dir, struct dentry *new_dentry); 421da177e4SLinus Torvalds 434b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 441da177e4SLinus Torvalds .open = afs_dir_open, 4500d3b7a4SDavid Howells .release = afs_release, 46260a9803SDavid Howells .readdir = afs_readdir, 47e8d6c554SDavid Howells .lock = afs_lock, 483222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 491da177e4SLinus Torvalds }; 501da177e4SLinus Torvalds 51754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 52260a9803SDavid Howells .create = afs_create, 53260a9803SDavid Howells .lookup = afs_lookup, 54260a9803SDavid Howells .link = afs_link, 55260a9803SDavid Howells .unlink = afs_unlink, 56260a9803SDavid Howells .symlink = afs_symlink, 57260a9803SDavid Howells .mkdir = afs_mkdir, 58260a9803SDavid Howells .rmdir = afs_rmdir, 59260a9803SDavid Howells .rename = afs_rename, 6000d3b7a4SDavid Howells .permission = afs_permission, 61416351f2SDavid Howells .getattr = afs_getattr, 6231143d5dSDavid Howells .setattr = afs_setattr, 631da177e4SLinus Torvalds }; 641da177e4SLinus Torvalds 65d61dcce2SAl Viro const struct dentry_operations afs_fs_dentry_operations = { 661da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 671da177e4SLinus Torvalds .d_delete = afs_d_delete, 68260a9803SDavid Howells .d_release = afs_d_release, 69d18610b0SDavid Howells .d_automount = afs_d_automount, 701da177e4SLinus Torvalds }; 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds #define AFS_DIR_HASHTBL_SIZE 128 731da177e4SLinus Torvalds #define AFS_DIR_DIRENT_SIZE 32 741da177e4SLinus Torvalds #define AFS_DIRENT_PER_BLOCK 64 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds union afs_dirent { 771da177e4SLinus Torvalds struct { 781da177e4SLinus Torvalds uint8_t valid; 791da177e4SLinus Torvalds uint8_t unused[1]; 801da177e4SLinus Torvalds __be16 hash_next; 811da177e4SLinus Torvalds __be32 vnode; 821da177e4SLinus Torvalds __be32 unique; 831da177e4SLinus Torvalds uint8_t name[16]; 841da177e4SLinus Torvalds uint8_t overflow[4]; /* if any char of the name (inc 851da177e4SLinus Torvalds * NUL) reaches here, consume 861da177e4SLinus Torvalds * the next dirent too */ 871da177e4SLinus Torvalds } u; 881da177e4SLinus Torvalds uint8_t extended_name[32]; 891da177e4SLinus Torvalds }; 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ 921da177e4SLinus Torvalds struct afs_dir_pagehdr { 931da177e4SLinus Torvalds __be16 npages; 941da177e4SLinus Torvalds __be16 magic; 951da177e4SLinus Torvalds #define AFS_DIR_MAGIC htons(1234) 961da177e4SLinus Torvalds uint8_t nentries; 971da177e4SLinus Torvalds uint8_t bitmap[8]; 981da177e4SLinus Torvalds uint8_t pad[19]; 991da177e4SLinus Torvalds }; 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds /* directory block layout */ 1021da177e4SLinus Torvalds union afs_dir_block { 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds struct { 1071da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1081da177e4SLinus Torvalds uint8_t alloc_ctrs[128]; 1091da177e4SLinus Torvalds /* dir hash table */ 1101da177e4SLinus Torvalds uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; 1111da177e4SLinus Torvalds } hdr; 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; 1141da177e4SLinus Torvalds }; 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds /* layout on a linux VM page */ 1171da177e4SLinus Torvalds struct afs_dir_page { 1181da177e4SLinus Torvalds union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; 1191da177e4SLinus Torvalds }; 1201da177e4SLinus Torvalds 121260a9803SDavid Howells struct afs_lookup_cookie { 1221da177e4SLinus Torvalds struct afs_fid fid; 1231da177e4SLinus Torvalds const char *name; 1241da177e4SLinus Torvalds size_t nlen; 1251da177e4SLinus Torvalds int found; 1261da177e4SLinus Torvalds }; 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds /* 1291da177e4SLinus Torvalds * check that a directory page is valid 1301da177e4SLinus Torvalds */ 1311da177e4SLinus Torvalds static inline void afs_dir_check_page(struct inode *dir, struct page *page) 1321da177e4SLinus Torvalds { 1331da177e4SLinus Torvalds struct afs_dir_page *dbuf; 1341da177e4SLinus Torvalds loff_t latter; 1351da177e4SLinus Torvalds int tmp, qty; 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds #if 0 1381da177e4SLinus Torvalds /* check the page count */ 1391da177e4SLinus Torvalds qty = desc.size / sizeof(dbuf->blocks[0]); 1401da177e4SLinus Torvalds if (qty == 0) 1411da177e4SLinus Torvalds goto error; 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { 1441da177e4SLinus Torvalds printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", 145530b6412SHarvey Harrison __func__, dir->i_ino, qty, 14608e0e7c8SDavid Howells ntohs(dbuf->blocks[0].pagehdr.npages)); 1471da177e4SLinus Torvalds goto error; 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds #endif 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds /* determine how many magic numbers there should be in this page */ 15254b21a79SAndrew Morton latter = dir->i_size - page_offset(page); 1531da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1541da177e4SLinus Torvalds qty = PAGE_SIZE; 1551da177e4SLinus Torvalds else 1561da177e4SLinus Torvalds qty = latter; 1571da177e4SLinus Torvalds qty /= sizeof(union afs_dir_block); 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds /* check them */ 1601da177e4SLinus Torvalds dbuf = page_address(page); 1611da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 1621da177e4SLinus Torvalds if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { 1631da177e4SLinus Torvalds printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n", 164530b6412SHarvey Harrison __func__, dir->i_ino, tmp, qty, 1651da177e4SLinus Torvalds ntohs(dbuf->blocks[tmp].pagehdr.magic)); 1661da177e4SLinus Torvalds goto error; 1671da177e4SLinus Torvalds } 1681da177e4SLinus Torvalds } 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds SetPageChecked(page); 1711da177e4SLinus Torvalds return; 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds error: 1741da177e4SLinus Torvalds SetPageChecked(page); 1751da177e4SLinus Torvalds SetPageError(page); 176ec26815aSDavid Howells } 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds /* 1791da177e4SLinus Torvalds * discard a page cached in the pagecache 1801da177e4SLinus Torvalds */ 1811da177e4SLinus Torvalds static inline void afs_dir_put_page(struct page *page) 1821da177e4SLinus Torvalds { 1831da177e4SLinus Torvalds kunmap(page); 1841da177e4SLinus Torvalds page_cache_release(page); 185ec26815aSDavid Howells } 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds /* 1881da177e4SLinus Torvalds * get a page into the pagecache 1891da177e4SLinus Torvalds */ 19000d3b7a4SDavid Howells static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, 19100d3b7a4SDavid Howells struct key *key) 1921da177e4SLinus Torvalds { 1931da177e4SLinus Torvalds struct page *page; 1941da177e4SLinus Torvalds _enter("{%lu},%lu", dir->i_ino, index); 1951da177e4SLinus Torvalds 196f6d335c0SAl Viro page = read_cache_page(dir->i_mapping, index, afs_page_filler, key); 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 /* 482bec5eb61Swanglei * Try to auto mount the mountpoint with pseudo directory, if the autocell 483bec5eb61Swanglei * operation is setted. 484bec5eb61Swanglei */ 485bec5eb61Swanglei static struct inode *afs_try_auto_mntpt( 486bec5eb61Swanglei int ret, struct dentry *dentry, struct inode *dir, struct key *key, 487bec5eb61Swanglei struct afs_fid *fid) 488bec5eb61Swanglei { 489bec5eb61Swanglei const char *devname = dentry->d_name.name; 490bec5eb61Swanglei struct afs_vnode *vnode = AFS_FS_I(dir); 491bec5eb61Swanglei struct inode *inode; 492bec5eb61Swanglei 493bec5eb61Swanglei _enter("%d, %p{%s}, {%x:%u}, %p", 494bec5eb61Swanglei ret, dentry, devname, vnode->fid.vid, vnode->fid.vnode, key); 495bec5eb61Swanglei 496bec5eb61Swanglei if (ret != -ENOENT || 497bec5eb61Swanglei !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags)) 498bec5eb61Swanglei goto out; 499bec5eb61Swanglei 500bec5eb61Swanglei inode = afs_iget_autocell(dir, devname, strlen(devname), key); 501bec5eb61Swanglei if (IS_ERR(inode)) { 502bec5eb61Swanglei ret = PTR_ERR(inode); 503bec5eb61Swanglei goto out; 504bec5eb61Swanglei } 505bec5eb61Swanglei 506bec5eb61Swanglei *fid = AFS_FS_I(inode)->fid; 507bec5eb61Swanglei _leave("= %p", inode); 508bec5eb61Swanglei return inode; 509bec5eb61Swanglei 510bec5eb61Swanglei out: 511bec5eb61Swanglei _leave("= %d", ret); 512bec5eb61Swanglei return ERR_PTR(ret); 513bec5eb61Swanglei } 514bec5eb61Swanglei 515bec5eb61Swanglei /* 51608e0e7c8SDavid Howells * look up an entry in a directory 51708e0e7c8SDavid Howells */ 518260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 51908e0e7c8SDavid Howells struct nameidata *nd) 52008e0e7c8SDavid Howells { 52108e0e7c8SDavid Howells struct afs_vnode *vnode; 52208e0e7c8SDavid Howells struct afs_fid fid; 52308e0e7c8SDavid Howells struct inode *inode; 52400d3b7a4SDavid Howells struct key *key; 52508e0e7c8SDavid Howells int ret; 52608e0e7c8SDavid Howells 527260a9803SDavid Howells vnode = AFS_FS_I(dir); 528260a9803SDavid Howells 529416351f2SDavid Howells _enter("{%x:%u},%p{%s},", 530260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name); 531260a9803SDavid Howells 532260a9803SDavid Howells ASSERTCMP(dentry->d_inode, ==, NULL); 53308e0e7c8SDavid Howells 53445222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 53508e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 53608e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 53708e0e7c8SDavid Howells } 53808e0e7c8SDavid Howells 53908e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 54008e0e7c8SDavid Howells _leave(" = -ESTALE"); 54108e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 54208e0e7c8SDavid Howells } 54308e0e7c8SDavid Howells 54400d3b7a4SDavid Howells key = afs_request_key(vnode->volume->cell); 54500d3b7a4SDavid Howells if (IS_ERR(key)) { 54600d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 547e231c2eeSDavid Howells return ERR_CAST(key); 54800d3b7a4SDavid Howells } 54900d3b7a4SDavid Howells 550260a9803SDavid Howells ret = afs_validate(vnode, key); 55108e0e7c8SDavid Howells if (ret < 0) { 55200d3b7a4SDavid Howells key_put(key); 553260a9803SDavid Howells _leave(" = %d [val]", ret); 5541da177e4SLinus Torvalds return ERR_PTR(ret); 5551da177e4SLinus Torvalds } 5561da177e4SLinus Torvalds 557260a9803SDavid Howells ret = afs_do_lookup(dir, dentry, &fid, key); 558260a9803SDavid Howells if (ret < 0) { 559bec5eb61Swanglei inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid); 560bec5eb61Swanglei if (!IS_ERR(inode)) { 561bec5eb61Swanglei key_put(key); 562bec5eb61Swanglei goto success; 563bec5eb61Swanglei } 564bec5eb61Swanglei 565bec5eb61Swanglei ret = PTR_ERR(inode); 566260a9803SDavid Howells key_put(key); 567260a9803SDavid Howells if (ret == -ENOENT) { 568260a9803SDavid Howells d_add(dentry, NULL); 569260a9803SDavid Howells _leave(" = NULL [negative]"); 570260a9803SDavid Howells return NULL; 571260a9803SDavid Howells } 572260a9803SDavid Howells _leave(" = %d [do]", ret); 573260a9803SDavid Howells return ERR_PTR(ret); 574260a9803SDavid Howells } 575260a9803SDavid Howells dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; 576260a9803SDavid Howells 5771da177e4SLinus Torvalds /* instantiate the dentry */ 578260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); 57900d3b7a4SDavid Howells key_put(key); 58008e0e7c8SDavid Howells if (IS_ERR(inode)) { 58108e0e7c8SDavid Howells _leave(" = %ld", PTR_ERR(inode)); 582e231c2eeSDavid Howells return ERR_CAST(inode); 5831da177e4SLinus Torvalds } 5841da177e4SLinus Torvalds 585bec5eb61Swanglei success: 5861da177e4SLinus Torvalds d_add(dentry, inode); 5877a224228SJean Noel Cordenner _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }", 58808e0e7c8SDavid Howells fid.vnode, 58908e0e7c8SDavid Howells fid.unique, 5901da177e4SLinus Torvalds dentry->d_inode->i_ino, 5917a224228SJean Noel Cordenner (unsigned long long)dentry->d_inode->i_version); 5921da177e4SLinus Torvalds 5931da177e4SLinus Torvalds return NULL; 594ec26815aSDavid Howells } 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds /* 5971da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 5981da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 5991da177e4SLinus Torvalds * inode 6001da177e4SLinus Torvalds */ 6011da177e4SLinus Torvalds static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd) 6021da177e4SLinus Torvalds { 603260a9803SDavid Howells struct afs_vnode *vnode, *dir; 604dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 6051da177e4SLinus Torvalds struct dentry *parent; 60600d3b7a4SDavid Howells struct key *key; 607260a9803SDavid Howells void *dir_version; 6081da177e4SLinus Torvalds int ret; 6091da177e4SLinus Torvalds 61034286d66SNick Piggin if (nd->flags & LOOKUP_RCU) 61134286d66SNick Piggin return -ECHILD; 61234286d66SNick Piggin 61308e0e7c8SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 61408e0e7c8SDavid Howells 615260a9803SDavid Howells if (dentry->d_inode) 616260a9803SDavid Howells _enter("{v={%x:%u} n=%s fl=%lx},", 617260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name, 618260a9803SDavid Howells vnode->flags); 619260a9803SDavid Howells else 620260a9803SDavid Howells _enter("{neg n=%s}", dentry->d_name.name); 6211da177e4SLinus Torvalds 622260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 62300d3b7a4SDavid Howells if (IS_ERR(key)) 62400d3b7a4SDavid Howells key = NULL; 62500d3b7a4SDavid Howells 6261da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 62708e0e7c8SDavid Howells parent = dget_parent(dentry); 628260a9803SDavid Howells if (!parent->d_inode) 6291da177e4SLinus Torvalds goto out_bad; 6301da177e4SLinus Torvalds 631260a9803SDavid Howells dir = AFS_FS_I(parent->d_inode); 6321da177e4SLinus Torvalds 633260a9803SDavid Howells /* validate the parent directory */ 634260a9803SDavid Howells if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) 635260a9803SDavid Howells afs_validate(dir, key); 636260a9803SDavid Howells 637260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 6381da177e4SLinus Torvalds _debug("%s: parent dir deleted", dentry->d_name.name); 6391da177e4SLinus Torvalds goto out_bad; 6401da177e4SLinus Torvalds } 6411da177e4SLinus Torvalds 642260a9803SDavid Howells dir_version = (void *) (unsigned long) dir->status.data_version; 643260a9803SDavid Howells if (dentry->d_fsdata == dir_version) 644260a9803SDavid Howells goto out_valid; /* the dir contents are unchanged */ 645260a9803SDavid Howells 64608e0e7c8SDavid Howells _debug("dir modified"); 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvalds /* search the directory for this vnode */ 649260a9803SDavid Howells ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); 650260a9803SDavid Howells switch (ret) { 651260a9803SDavid Howells case 0: 652260a9803SDavid Howells /* the filename maps to something */ 653260a9803SDavid Howells if (!dentry->d_inode) 654260a9803SDavid Howells goto out_bad; 655260a9803SDavid Howells if (is_bad_inode(dentry->d_inode)) { 656260a9803SDavid Howells printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n", 657260a9803SDavid Howells parent->d_name.name, dentry->d_name.name); 6581da177e4SLinus Torvalds goto out_bad; 6591da177e4SLinus Torvalds } 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 6621da177e4SLinus Torvalds * different file */ 66308e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 66408e0e7c8SDavid Howells _debug("%s: dirent changed [%u != %u]", 66508e0e7c8SDavid Howells dentry->d_name.name, fid.vnode, 66608e0e7c8SDavid Howells vnode->fid.vnode); 6671da177e4SLinus Torvalds goto not_found; 6681da177e4SLinus Torvalds } 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 671260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 672260a9803SDavid Howells * been reused */ 67308e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 6747a224228SJean Noel Cordenner _debug("%s: file deleted (uq %u -> %u I:%llu)", 67508e0e7c8SDavid Howells dentry->d_name.name, fid.unique, 6767a224228SJean Noel Cordenner vnode->fid.unique, 6777a224228SJean Noel Cordenner (unsigned long long)dentry->d_inode->i_version); 67808e0e7c8SDavid Howells spin_lock(&vnode->lock); 67908e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 68008e0e7c8SDavid Howells spin_unlock(&vnode->lock); 681260a9803SDavid Howells goto not_found; 682260a9803SDavid Howells } 683260a9803SDavid Howells goto out_valid; 684260a9803SDavid Howells 685260a9803SDavid Howells case -ENOENT: 686260a9803SDavid Howells /* the filename is unknown */ 687260a9803SDavid Howells _debug("%s: dirent not found", dentry->d_name.name); 688260a9803SDavid Howells if (dentry->d_inode) 689260a9803SDavid Howells goto not_found; 690260a9803SDavid Howells goto out_valid; 691260a9803SDavid Howells 692260a9803SDavid Howells default: 693260a9803SDavid Howells _debug("failed to iterate dir %s: %d", 694260a9803SDavid Howells parent->d_name.name, ret); 6951da177e4SLinus Torvalds goto out_bad; 6961da177e4SLinus Torvalds } 69708e0e7c8SDavid Howells 6981da177e4SLinus Torvalds out_valid: 699260a9803SDavid Howells dentry->d_fsdata = dir_version; 700260a9803SDavid Howells out_skip: 7011da177e4SLinus Torvalds dput(parent); 70200d3b7a4SDavid Howells key_put(key); 7031da177e4SLinus Torvalds _leave(" = 1 [valid]"); 7041da177e4SLinus Torvalds return 1; 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 7071da177e4SLinus Torvalds not_found: 7081da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 7091da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 7101da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds out_bad: 713260a9803SDavid Howells if (dentry->d_inode) { 7141da177e4SLinus Torvalds /* don't unhash if we have submounts */ 7151da177e4SLinus Torvalds if (have_submounts(dentry)) 716260a9803SDavid Howells goto out_skip; 7171da177e4SLinus Torvalds } 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds _debug("dropping dentry %s/%s", 72008e0e7c8SDavid Howells parent->d_name.name, dentry->d_name.name); 72108e0e7c8SDavid Howells shrink_dcache_parent(dentry); 7221da177e4SLinus Torvalds d_drop(dentry); 7231da177e4SLinus Torvalds dput(parent); 72400d3b7a4SDavid Howells key_put(key); 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds _leave(" = 0 [bad]"); 7271da177e4SLinus Torvalds return 0; 728ec26815aSDavid Howells } 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds /* 7311da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 7321da177e4SLinus Torvalds * sleep) 7331da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 7341da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 7351da177e4SLinus Torvalds */ 736fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 7371da177e4SLinus Torvalds { 7381da177e4SLinus Torvalds _enter("%s", dentry->d_name.name); 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 7411da177e4SLinus Torvalds goto zap; 7421da177e4SLinus Torvalds 74308e0e7c8SDavid Howells if (dentry->d_inode && 744bec5eb61Swanglei (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags) || 745bec5eb61Swanglei test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(dentry->d_inode)->flags))) 7461da177e4SLinus Torvalds goto zap; 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds _leave(" = 0 [keep]"); 7491da177e4SLinus Torvalds return 0; 7501da177e4SLinus Torvalds 7511da177e4SLinus Torvalds zap: 7521da177e4SLinus Torvalds _leave(" = 1 [zap]"); 7531da177e4SLinus Torvalds return 1; 754ec26815aSDavid Howells } 755260a9803SDavid Howells 756260a9803SDavid Howells /* 757260a9803SDavid Howells * handle dentry release 758260a9803SDavid Howells */ 759260a9803SDavid Howells static void afs_d_release(struct dentry *dentry) 760260a9803SDavid Howells { 761260a9803SDavid Howells _enter("%s", dentry->d_name.name); 762260a9803SDavid Howells } 763260a9803SDavid Howells 764260a9803SDavid Howells /* 765260a9803SDavid Howells * create a directory on an AFS filesystem 766260a9803SDavid Howells */ 767260a9803SDavid Howells static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 768260a9803SDavid Howells { 769260a9803SDavid Howells struct afs_file_status status; 770260a9803SDavid Howells struct afs_callback cb; 771260a9803SDavid Howells struct afs_server *server; 772260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 773260a9803SDavid Howells struct afs_fid fid; 774260a9803SDavid Howells struct inode *inode; 775260a9803SDavid Howells struct key *key; 776260a9803SDavid Howells int ret; 777260a9803SDavid Howells 778260a9803SDavid Howells dvnode = AFS_FS_I(dir); 779260a9803SDavid Howells 780416351f2SDavid Howells _enter("{%x:%u},{%s},%o", 781260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 782260a9803SDavid Howells 783260a9803SDavid Howells ret = -ENAMETOOLONG; 78445222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 785260a9803SDavid Howells goto error; 786260a9803SDavid Howells 787260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 788260a9803SDavid Howells if (IS_ERR(key)) { 789260a9803SDavid Howells ret = PTR_ERR(key); 790260a9803SDavid Howells goto error; 791260a9803SDavid Howells } 792260a9803SDavid Howells 793260a9803SDavid Howells mode |= S_IFDIR; 794260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 795260a9803SDavid Howells mode, &fid, &status, &cb, &server); 796260a9803SDavid Howells if (ret < 0) 797260a9803SDavid Howells goto mkdir_error; 798260a9803SDavid Howells 799260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 800260a9803SDavid Howells if (IS_ERR(inode)) { 801260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 802260a9803SDavid Howells * directory on the server */ 803260a9803SDavid Howells ret = PTR_ERR(inode); 804260a9803SDavid Howells goto iget_error; 805260a9803SDavid Howells } 806260a9803SDavid Howells 807260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 808260a9803SDavid Howells vnode = AFS_FS_I(inode); 809260a9803SDavid Howells spin_lock(&vnode->lock); 810260a9803SDavid Howells vnode->update_cnt++; 811260a9803SDavid Howells spin_unlock(&vnode->lock); 812260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 813260a9803SDavid Howells afs_put_server(server); 814260a9803SDavid Howells 815260a9803SDavid Howells d_instantiate(dentry, inode); 816260a9803SDavid Howells if (d_unhashed(dentry)) { 817260a9803SDavid Howells _debug("not hashed"); 818260a9803SDavid Howells d_rehash(dentry); 819260a9803SDavid Howells } 820260a9803SDavid Howells key_put(key); 821260a9803SDavid Howells _leave(" = 0"); 822260a9803SDavid Howells return 0; 823260a9803SDavid Howells 824260a9803SDavid Howells iget_error: 825260a9803SDavid Howells afs_put_server(server); 826260a9803SDavid Howells mkdir_error: 827260a9803SDavid Howells key_put(key); 828260a9803SDavid Howells error: 829260a9803SDavid Howells d_drop(dentry); 830260a9803SDavid Howells _leave(" = %d", ret); 831260a9803SDavid Howells return ret; 832260a9803SDavid Howells } 833260a9803SDavid Howells 834260a9803SDavid Howells /* 835260a9803SDavid Howells * remove a directory from an AFS filesystem 836260a9803SDavid Howells */ 837260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 838260a9803SDavid Howells { 839260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 840260a9803SDavid Howells struct key *key; 841260a9803SDavid Howells int ret; 842260a9803SDavid Howells 843260a9803SDavid Howells dvnode = AFS_FS_I(dir); 844260a9803SDavid Howells 845416351f2SDavid Howells _enter("{%x:%u},{%s}", 846260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 847260a9803SDavid Howells 848260a9803SDavid Howells ret = -ENAMETOOLONG; 84945222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 850260a9803SDavid Howells goto error; 851260a9803SDavid Howells 852260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 853260a9803SDavid Howells if (IS_ERR(key)) { 854260a9803SDavid Howells ret = PTR_ERR(key); 855260a9803SDavid Howells goto error; 856260a9803SDavid Howells } 857260a9803SDavid Howells 858260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); 859260a9803SDavid Howells if (ret < 0) 860260a9803SDavid Howells goto rmdir_error; 861260a9803SDavid Howells 862260a9803SDavid Howells if (dentry->d_inode) { 863260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 864260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 865260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 866260a9803SDavid Howells afs_discard_callback_on_delete(vnode); 867260a9803SDavid Howells } 868260a9803SDavid Howells 869260a9803SDavid Howells key_put(key); 870260a9803SDavid Howells _leave(" = 0"); 871260a9803SDavid Howells return 0; 872260a9803SDavid Howells 873260a9803SDavid Howells rmdir_error: 874260a9803SDavid Howells key_put(key); 875260a9803SDavid Howells error: 876260a9803SDavid Howells _leave(" = %d", ret); 877260a9803SDavid Howells return ret; 878260a9803SDavid Howells } 879260a9803SDavid Howells 880260a9803SDavid Howells /* 881260a9803SDavid Howells * remove a file from an AFS filesystem 882260a9803SDavid Howells */ 883260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 884260a9803SDavid Howells { 885260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 886260a9803SDavid Howells struct key *key; 887260a9803SDavid Howells int ret; 888260a9803SDavid Howells 889260a9803SDavid Howells dvnode = AFS_FS_I(dir); 890260a9803SDavid Howells 891416351f2SDavid Howells _enter("{%x:%u},{%s}", 892260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 893260a9803SDavid Howells 894260a9803SDavid Howells ret = -ENAMETOOLONG; 89545222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 896260a9803SDavid Howells goto error; 897260a9803SDavid Howells 898260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 899260a9803SDavid Howells if (IS_ERR(key)) { 900260a9803SDavid Howells ret = PTR_ERR(key); 901260a9803SDavid Howells goto error; 902260a9803SDavid Howells } 903260a9803SDavid Howells 904260a9803SDavid Howells if (dentry->d_inode) { 905260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 906260a9803SDavid Howells 907260a9803SDavid Howells /* make sure we have a callback promise on the victim */ 908260a9803SDavid Howells ret = afs_validate(vnode, key); 909260a9803SDavid Howells if (ret < 0) 910260a9803SDavid Howells goto error; 911260a9803SDavid Howells } 912260a9803SDavid Howells 913260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); 914260a9803SDavid Howells if (ret < 0) 915260a9803SDavid Howells goto remove_error; 916260a9803SDavid Howells 917260a9803SDavid Howells if (dentry->d_inode) { 918260a9803SDavid Howells /* if the file wasn't deleted due to excess hard links, the 919260a9803SDavid Howells * fileserver will break the callback promise on the file - if 920260a9803SDavid Howells * it had one - before it returns to us, and if it was deleted, 921260a9803SDavid Howells * it won't 922260a9803SDavid Howells * 923260a9803SDavid Howells * however, if we didn't have a callback promise outstanding, 924260a9803SDavid Howells * or it was outstanding on a different server, then it won't 925260a9803SDavid Howells * break it either... 926260a9803SDavid Howells */ 927260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 928260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 929260a9803SDavid Howells _debug("AFS_VNODE_DELETED"); 930260a9803SDavid Howells if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) 931260a9803SDavid Howells _debug("AFS_VNODE_CB_BROKEN"); 932260a9803SDavid Howells set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); 933260a9803SDavid Howells ret = afs_validate(vnode, key); 934260a9803SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 935260a9803SDavid Howells } 936260a9803SDavid Howells 937260a9803SDavid Howells key_put(key); 938260a9803SDavid Howells _leave(" = 0"); 939260a9803SDavid Howells return 0; 940260a9803SDavid Howells 941260a9803SDavid Howells remove_error: 942260a9803SDavid Howells key_put(key); 943260a9803SDavid Howells error: 944260a9803SDavid Howells _leave(" = %d", ret); 945260a9803SDavid Howells return ret; 946260a9803SDavid Howells } 947260a9803SDavid Howells 948260a9803SDavid Howells /* 949260a9803SDavid Howells * create a regular file on an AFS filesystem 950260a9803SDavid Howells */ 951260a9803SDavid Howells static int afs_create(struct inode *dir, struct dentry *dentry, int mode, 952260a9803SDavid Howells struct nameidata *nd) 953260a9803SDavid Howells { 954260a9803SDavid Howells struct afs_file_status status; 955260a9803SDavid Howells struct afs_callback cb; 956260a9803SDavid Howells struct afs_server *server; 957260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 958260a9803SDavid Howells struct afs_fid fid; 959260a9803SDavid Howells struct inode *inode; 960260a9803SDavid Howells struct key *key; 961260a9803SDavid Howells int ret; 962260a9803SDavid Howells 963260a9803SDavid Howells dvnode = AFS_FS_I(dir); 964260a9803SDavid Howells 965416351f2SDavid Howells _enter("{%x:%u},{%s},%o,", 966260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 967260a9803SDavid Howells 968260a9803SDavid Howells ret = -ENAMETOOLONG; 96945222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 970260a9803SDavid Howells goto error; 971260a9803SDavid Howells 972260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 973260a9803SDavid Howells if (IS_ERR(key)) { 974260a9803SDavid Howells ret = PTR_ERR(key); 975260a9803SDavid Howells goto error; 976260a9803SDavid Howells } 977260a9803SDavid Howells 978260a9803SDavid Howells mode |= S_IFREG; 979260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 980260a9803SDavid Howells mode, &fid, &status, &cb, &server); 981260a9803SDavid Howells if (ret < 0) 982260a9803SDavid Howells goto create_error; 983260a9803SDavid Howells 984260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 985260a9803SDavid Howells if (IS_ERR(inode)) { 986260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 987260a9803SDavid Howells * directory on the server */ 988260a9803SDavid Howells ret = PTR_ERR(inode); 989260a9803SDavid Howells goto iget_error; 990260a9803SDavid Howells } 991260a9803SDavid Howells 992260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 993260a9803SDavid Howells vnode = AFS_FS_I(inode); 994260a9803SDavid Howells spin_lock(&vnode->lock); 995260a9803SDavid Howells vnode->update_cnt++; 996260a9803SDavid Howells spin_unlock(&vnode->lock); 997260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 998260a9803SDavid Howells afs_put_server(server); 999260a9803SDavid Howells 1000260a9803SDavid Howells d_instantiate(dentry, inode); 1001260a9803SDavid Howells if (d_unhashed(dentry)) { 1002260a9803SDavid Howells _debug("not hashed"); 1003260a9803SDavid Howells d_rehash(dentry); 1004260a9803SDavid Howells } 1005260a9803SDavid Howells key_put(key); 1006260a9803SDavid Howells _leave(" = 0"); 1007260a9803SDavid Howells return 0; 1008260a9803SDavid Howells 1009260a9803SDavid Howells iget_error: 1010260a9803SDavid Howells afs_put_server(server); 1011260a9803SDavid Howells create_error: 1012260a9803SDavid Howells key_put(key); 1013260a9803SDavid Howells error: 1014260a9803SDavid Howells d_drop(dentry); 1015260a9803SDavid Howells _leave(" = %d", ret); 1016260a9803SDavid Howells return ret; 1017260a9803SDavid Howells } 1018260a9803SDavid Howells 1019260a9803SDavid Howells /* 1020260a9803SDavid Howells * create a hard link between files in an AFS filesystem 1021260a9803SDavid Howells */ 1022260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 1023260a9803SDavid Howells struct dentry *dentry) 1024260a9803SDavid Howells { 1025260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1026260a9803SDavid Howells struct key *key; 1027260a9803SDavid Howells int ret; 1028260a9803SDavid Howells 1029260a9803SDavid Howells vnode = AFS_FS_I(from->d_inode); 1030260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1031260a9803SDavid Howells 1032416351f2SDavid Howells _enter("{%x:%u},{%x:%u},{%s}", 1033260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1034260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1035260a9803SDavid Howells dentry->d_name.name); 1036260a9803SDavid Howells 1037260a9803SDavid Howells ret = -ENAMETOOLONG; 103845222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1039260a9803SDavid Howells goto error; 1040260a9803SDavid Howells 1041260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1042260a9803SDavid Howells if (IS_ERR(key)) { 1043260a9803SDavid Howells ret = PTR_ERR(key); 1044260a9803SDavid Howells goto error; 1045260a9803SDavid Howells } 1046260a9803SDavid Howells 1047260a9803SDavid Howells ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); 1048260a9803SDavid Howells if (ret < 0) 1049260a9803SDavid Howells goto link_error; 1050260a9803SDavid Howells 10517de9c6eeSAl Viro ihold(&vnode->vfs_inode); 1052260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1053260a9803SDavid Howells key_put(key); 1054260a9803SDavid Howells _leave(" = 0"); 1055260a9803SDavid Howells return 0; 1056260a9803SDavid Howells 1057260a9803SDavid Howells link_error: 1058260a9803SDavid Howells key_put(key); 1059260a9803SDavid Howells error: 1060260a9803SDavid Howells d_drop(dentry); 1061260a9803SDavid Howells _leave(" = %d", ret); 1062260a9803SDavid Howells return ret; 1063260a9803SDavid Howells } 1064260a9803SDavid Howells 1065260a9803SDavid Howells /* 1066260a9803SDavid Howells * create a symlink in an AFS filesystem 1067260a9803SDavid Howells */ 1068260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1069260a9803SDavid Howells const char *content) 1070260a9803SDavid Howells { 1071260a9803SDavid Howells struct afs_file_status status; 1072260a9803SDavid Howells struct afs_server *server; 1073260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1074260a9803SDavid Howells struct afs_fid fid; 1075260a9803SDavid Howells struct inode *inode; 1076260a9803SDavid Howells struct key *key; 1077260a9803SDavid Howells int ret; 1078260a9803SDavid Howells 1079260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1080260a9803SDavid Howells 1081416351f2SDavid Howells _enter("{%x:%u},{%s},%s", 1082260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, 1083260a9803SDavid Howells content); 1084260a9803SDavid Howells 1085260a9803SDavid Howells ret = -ENAMETOOLONG; 108645222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1087260a9803SDavid Howells goto error; 1088260a9803SDavid Howells 1089260a9803SDavid Howells ret = -EINVAL; 109045222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1091260a9803SDavid Howells goto error; 1092260a9803SDavid Howells 1093260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1094260a9803SDavid Howells if (IS_ERR(key)) { 1095260a9803SDavid Howells ret = PTR_ERR(key); 1096260a9803SDavid Howells goto error; 1097260a9803SDavid Howells } 1098260a9803SDavid Howells 1099260a9803SDavid Howells ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, 1100260a9803SDavid Howells &fid, &status, &server); 1101260a9803SDavid Howells if (ret < 0) 1102260a9803SDavid Howells goto create_error; 1103260a9803SDavid Howells 1104260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); 1105260a9803SDavid Howells if (IS_ERR(inode)) { 1106260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 1107260a9803SDavid Howells * directory on the server */ 1108260a9803SDavid Howells ret = PTR_ERR(inode); 1109260a9803SDavid Howells goto iget_error; 1110260a9803SDavid Howells } 1111260a9803SDavid Howells 1112260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 1113260a9803SDavid Howells vnode = AFS_FS_I(inode); 1114260a9803SDavid Howells spin_lock(&vnode->lock); 1115260a9803SDavid Howells vnode->update_cnt++; 1116260a9803SDavid Howells spin_unlock(&vnode->lock); 1117260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 1118260a9803SDavid Howells afs_put_server(server); 1119260a9803SDavid Howells 1120260a9803SDavid Howells d_instantiate(dentry, inode); 1121260a9803SDavid Howells if (d_unhashed(dentry)) { 1122260a9803SDavid Howells _debug("not hashed"); 1123260a9803SDavid Howells d_rehash(dentry); 1124260a9803SDavid Howells } 1125260a9803SDavid Howells key_put(key); 1126260a9803SDavid Howells _leave(" = 0"); 1127260a9803SDavid Howells return 0; 1128260a9803SDavid Howells 1129260a9803SDavid Howells iget_error: 1130260a9803SDavid Howells afs_put_server(server); 1131260a9803SDavid Howells create_error: 1132260a9803SDavid Howells key_put(key); 1133260a9803SDavid Howells error: 1134260a9803SDavid Howells d_drop(dentry); 1135260a9803SDavid Howells _leave(" = %d", ret); 1136260a9803SDavid Howells return ret; 1137260a9803SDavid Howells } 1138260a9803SDavid Howells 1139260a9803SDavid Howells /* 1140260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1141260a9803SDavid Howells */ 1142260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 1143260a9803SDavid Howells struct inode *new_dir, struct dentry *new_dentry) 1144260a9803SDavid Howells { 1145260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1146260a9803SDavid Howells struct key *key; 1147260a9803SDavid Howells int ret; 1148260a9803SDavid Howells 1149260a9803SDavid Howells vnode = AFS_FS_I(old_dentry->d_inode); 1150260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1151260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1152260a9803SDavid Howells 1153416351f2SDavid Howells _enter("{%x:%u},{%x:%u},{%x:%u},{%s}", 1154260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1155260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1156260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1157260a9803SDavid Howells new_dentry->d_name.name); 1158260a9803SDavid Howells 1159260a9803SDavid Howells ret = -ENAMETOOLONG; 116045222b9eSDavid Howells if (new_dentry->d_name.len >= AFSNAMEMAX) 1161260a9803SDavid Howells goto error; 1162260a9803SDavid Howells 1163260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1164260a9803SDavid Howells if (IS_ERR(key)) { 1165260a9803SDavid Howells ret = PTR_ERR(key); 1166260a9803SDavid Howells goto error; 1167260a9803SDavid Howells } 1168260a9803SDavid Howells 1169260a9803SDavid Howells ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, 1170260a9803SDavid Howells old_dentry->d_name.name, 1171260a9803SDavid Howells new_dentry->d_name.name); 1172260a9803SDavid Howells if (ret < 0) 1173260a9803SDavid Howells goto rename_error; 1174260a9803SDavid Howells key_put(key); 1175260a9803SDavid Howells _leave(" = 0"); 1176260a9803SDavid Howells return 0; 1177260a9803SDavid Howells 1178260a9803SDavid Howells rename_error: 1179260a9803SDavid Howells key_put(key); 1180260a9803SDavid Howells error: 1181260a9803SDavid Howells d_drop(new_dentry); 1182260a9803SDavid Howells _leave(" = %d", ret); 1183260a9803SDavid Howells return ret; 1184260a9803SDavid Howells } 1185