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, 2300cd8dd3SAl Viro unsigned int flags); 241da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file); 251bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx); 260b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); 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); 314acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 32ebfc3b49SAl Viro bool excl); 3318bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t 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, 461bbae9f8SAl Viro .iterate = 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 { 1221bbae9f8SAl Viro struct dir_context ctx; 1231da177e4SLinus Torvalds struct afs_fid fid; 1241bbae9f8SAl Viro struct qstr name; 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 */ 2311bbae9f8SAl Viro static int afs_dir_iterate_block(struct dir_context *ctx, 2321da177e4SLinus Torvalds union afs_dir_block *block, 2331bbae9f8SAl Viro unsigned blkoff) 2341da177e4SLinus Torvalds { 2351da177e4SLinus Torvalds union afs_dirent *dire; 2361da177e4SLinus Torvalds unsigned offset, next, curr; 2371da177e4SLinus Torvalds size_t nlen; 2381bbae9f8SAl Viro int tmp; 2391da177e4SLinus Torvalds 2401bbae9f8SAl Viro _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 2411da177e4SLinus Torvalds 2421bbae9f8SAl Viro curr = (ctx->pos - blkoff) / sizeof(union afs_dirent); 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds /* walk through the block, an entry at a time */ 2451da177e4SLinus Torvalds for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; 2461da177e4SLinus Torvalds offset < AFS_DIRENT_PER_BLOCK; 2471da177e4SLinus Torvalds offset = next 2481da177e4SLinus Torvalds ) { 2491da177e4SLinus Torvalds next = offset + 1; 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds /* skip entries marked unused in the bitmap */ 2521da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[offset / 8] & 2531da177e4SLinus Torvalds (1 << (offset % 8)))) { 25408e0e7c8SDavid Howells _debug("ENT[%Zu.%u]: unused", 2551da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset); 2561da177e4SLinus Torvalds if (offset >= curr) 2571bbae9f8SAl Viro ctx->pos = blkoff + 2581da177e4SLinus Torvalds next * sizeof(union afs_dirent); 2591da177e4SLinus Torvalds continue; 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds /* got a valid entry */ 2631da177e4SLinus Torvalds dire = &block->dirents[offset]; 2641da177e4SLinus Torvalds nlen = strnlen(dire->u.name, 2651da177e4SLinus Torvalds sizeof(*block) - 2661da177e4SLinus Torvalds offset * sizeof(union afs_dirent)); 2671da177e4SLinus Torvalds 26808e0e7c8SDavid Howells _debug("ENT[%Zu.%u]: %s %Zu \"%s\"", 2691da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset, 2701da177e4SLinus Torvalds (offset < curr ? "skip" : "fill"), 2711da177e4SLinus Torvalds nlen, dire->u.name); 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds /* work out where the next possible entry is */ 2741da177e4SLinus Torvalds for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { 2751da177e4SLinus Torvalds if (next >= AFS_DIRENT_PER_BLOCK) { 2761da177e4SLinus Torvalds _debug("ENT[%Zu.%u]:" 2771da177e4SLinus Torvalds " %u travelled beyond end dir block" 27808e0e7c8SDavid Howells " (len %u/%Zu)", 2791da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 2801da177e4SLinus Torvalds offset, next, tmp, nlen); 2811da177e4SLinus Torvalds return -EIO; 2821da177e4SLinus Torvalds } 2831da177e4SLinus Torvalds if (!(block->pagehdr.bitmap[next / 8] & 2841da177e4SLinus Torvalds (1 << (next % 8)))) { 2851da177e4SLinus Torvalds _debug("ENT[%Zu.%u]:" 28608e0e7c8SDavid Howells " %u unmarked extension (len %u/%Zu)", 2871da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 2881da177e4SLinus Torvalds offset, next, tmp, nlen); 2891da177e4SLinus Torvalds return -EIO; 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds 29208e0e7c8SDavid Howells _debug("ENT[%Zu.%u]: ext %u/%Zu", 2931da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), 2941da177e4SLinus Torvalds next, tmp, nlen); 2951da177e4SLinus Torvalds next++; 2961da177e4SLinus Torvalds } 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds /* skip if starts before the current position */ 2991da177e4SLinus Torvalds if (offset < curr) 3001da177e4SLinus Torvalds continue; 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds /* found the next entry */ 3031bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 3041da177e4SLinus Torvalds ntohl(dire->u.vnode), 3051bbae9f8SAl Viro ctx->actor == afs_lookup_filldir ? 3061bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 3071da177e4SLinus Torvalds _leave(" = 0 [full]"); 3081da177e4SLinus Torvalds return 0; 3091da177e4SLinus Torvalds } 3101da177e4SLinus Torvalds 3111bbae9f8SAl Viro ctx->pos = blkoff + next * sizeof(union afs_dirent); 3121da177e4SLinus Torvalds } 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds _leave(" = 1 [more]"); 3151da177e4SLinus Torvalds return 1; 316ec26815aSDavid Howells } 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds /* 31908e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 3201da177e4SLinus Torvalds */ 3211bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 3221bbae9f8SAl Viro struct key *key) 3231da177e4SLinus Torvalds { 3241da177e4SLinus Torvalds union afs_dir_block *dblock; 3251da177e4SLinus Torvalds struct afs_dir_page *dbuf; 3261da177e4SLinus Torvalds struct page *page; 3271da177e4SLinus Torvalds unsigned blkoff, limit; 3281da177e4SLinus Torvalds int ret; 3291da177e4SLinus Torvalds 3301bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 3311da177e4SLinus Torvalds 33208e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 3331da177e4SLinus Torvalds _leave(" = -ESTALE"); 3341da177e4SLinus Torvalds return -ESTALE; 3351da177e4SLinus Torvalds } 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 3381bbae9f8SAl Viro ctx->pos += sizeof(union afs_dirent) - 1; 3391bbae9f8SAl Viro ctx->pos &= ~(sizeof(union afs_dirent) - 1); 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds /* walk through the blocks in sequence */ 3421da177e4SLinus Torvalds ret = 0; 3431bbae9f8SAl Viro while (ctx->pos < dir->i_size) { 3441bbae9f8SAl Viro blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1); 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds /* fetch the appropriate page from the directory */ 34700d3b7a4SDavid Howells page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); 3481da177e4SLinus Torvalds if (IS_ERR(page)) { 3491da177e4SLinus Torvalds ret = PTR_ERR(page); 3501da177e4SLinus Torvalds break; 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds dbuf = page_address(page); 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 3581da177e4SLinus Torvalds do { 3591da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 3601da177e4SLinus Torvalds sizeof(union afs_dir_block)]; 3611bbae9f8SAl Viro ret = afs_dir_iterate_block(ctx, dblock, blkoff); 3621da177e4SLinus Torvalds if (ret != 1) { 3631da177e4SLinus Torvalds afs_dir_put_page(page); 3641da177e4SLinus Torvalds goto out; 3651da177e4SLinus Torvalds } 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds blkoff += sizeof(union afs_dir_block); 3681da177e4SLinus Torvalds 3691bbae9f8SAl Viro } while (ctx->pos < dir->i_size && blkoff < limit); 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds afs_dir_put_page(page); 3721da177e4SLinus Torvalds ret = 0; 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds out: 3761da177e4SLinus Torvalds _leave(" = %d", ret); 3771da177e4SLinus Torvalds return ret; 378ec26815aSDavid Howells } 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds /* 3811da177e4SLinus Torvalds * read an AFS directory 3821da177e4SLinus Torvalds */ 3831bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx) 3841da177e4SLinus Torvalds { 3851bbae9f8SAl Viro return afs_dir_iterate(file_inode(file), 3861bbae9f8SAl Viro ctx, file->private_data); 387ec26815aSDavid Howells } 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds /* 3901da177e4SLinus Torvalds * search the directory for a name 3911da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 3921da177e4SLinus Torvalds * uniquifier through dtype 3931da177e4SLinus Torvalds */ 394260a9803SDavid Howells static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, 395afefdbb2SDavid Howells loff_t fpos, u64 ino, unsigned dtype) 3961da177e4SLinus Torvalds { 397260a9803SDavid Howells struct afs_lookup_cookie *cookie = _cookie; 3981da177e4SLinus Torvalds 3991bbae9f8SAl Viro _enter("{%s,%u},%s,%u,,%llu,%u", 4001bbae9f8SAl Viro cookie->name.name, cookie->name.len, name, nlen, 401ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 4021da177e4SLinus Torvalds 40308e0e7c8SDavid Howells /* insanity checks first */ 40408e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 40508e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 40608e0e7c8SDavid Howells 4071bbae9f8SAl Viro if (cookie->name.len != nlen || 4081bbae9f8SAl Viro memcmp(cookie->name.name, name, nlen) != 0) { 4091da177e4SLinus Torvalds _leave(" = 0 [no]"); 4101da177e4SLinus Torvalds return 0; 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds cookie->fid.vnode = ino; 4141da177e4SLinus Torvalds cookie->fid.unique = dtype; 4151da177e4SLinus Torvalds cookie->found = 1; 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds _leave(" = -1 [found]"); 4181da177e4SLinus Torvalds return -1; 419ec26815aSDavid Howells } 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds /* 42208e0e7c8SDavid Howells * do a lookup in a directory 423260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 4241da177e4SLinus Torvalds */ 42508e0e7c8SDavid Howells static int afs_do_lookup(struct inode *dir, struct dentry *dentry, 42600d3b7a4SDavid Howells struct afs_fid *fid, struct key *key) 4271da177e4SLinus Torvalds { 4281bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 4291bbae9f8SAl Viro struct afs_lookup_cookie cookie = { 4301bbae9f8SAl Viro .ctx.actor = afs_lookup_filldir, 4311bbae9f8SAl Viro .name = dentry->d_name, 4321bbae9f8SAl Viro .fid.vid = as->volume->vid 4331bbae9f8SAl Viro }; 4341da177e4SLinus Torvalds int ret; 4351da177e4SLinus Torvalds 43608e0e7c8SDavid Howells _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name); 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds /* search the directory */ 4391bbae9f8SAl Viro ret = afs_dir_iterate(dir, &cookie.ctx, key); 4401da177e4SLinus Torvalds if (ret < 0) { 44108e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 44208e0e7c8SDavid Howells return ret; 4431da177e4SLinus Torvalds } 4441da177e4SLinus Torvalds 4451da177e4SLinus Torvalds ret = -ENOENT; 4461da177e4SLinus Torvalds if (!cookie.found) { 44708e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 44808e0e7c8SDavid Howells return -ENOENT; 44908e0e7c8SDavid Howells } 45008e0e7c8SDavid Howells 45108e0e7c8SDavid Howells *fid = cookie.fid; 45208e0e7c8SDavid Howells _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); 45308e0e7c8SDavid Howells return 0; 45408e0e7c8SDavid Howells } 45508e0e7c8SDavid Howells 45608e0e7c8SDavid Howells /* 457bec5eb61Swanglei * Try to auto mount the mountpoint with pseudo directory, if the autocell 458bec5eb61Swanglei * operation is setted. 459bec5eb61Swanglei */ 460bec5eb61Swanglei static struct inode *afs_try_auto_mntpt( 461bec5eb61Swanglei int ret, struct dentry *dentry, struct inode *dir, struct key *key, 462bec5eb61Swanglei struct afs_fid *fid) 463bec5eb61Swanglei { 464bec5eb61Swanglei const char *devname = dentry->d_name.name; 465bec5eb61Swanglei struct afs_vnode *vnode = AFS_FS_I(dir); 466bec5eb61Swanglei struct inode *inode; 467bec5eb61Swanglei 468bec5eb61Swanglei _enter("%d, %p{%s}, {%x:%u}, %p", 469bec5eb61Swanglei ret, dentry, devname, vnode->fid.vid, vnode->fid.vnode, key); 470bec5eb61Swanglei 471bec5eb61Swanglei if (ret != -ENOENT || 472bec5eb61Swanglei !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags)) 473bec5eb61Swanglei goto out; 474bec5eb61Swanglei 475bec5eb61Swanglei inode = afs_iget_autocell(dir, devname, strlen(devname), key); 476bec5eb61Swanglei if (IS_ERR(inode)) { 477bec5eb61Swanglei ret = PTR_ERR(inode); 478bec5eb61Swanglei goto out; 479bec5eb61Swanglei } 480bec5eb61Swanglei 481bec5eb61Swanglei *fid = AFS_FS_I(inode)->fid; 482bec5eb61Swanglei _leave("= %p", inode); 483bec5eb61Swanglei return inode; 484bec5eb61Swanglei 485bec5eb61Swanglei out: 486bec5eb61Swanglei _leave("= %d", ret); 487bec5eb61Swanglei return ERR_PTR(ret); 488bec5eb61Swanglei } 489bec5eb61Swanglei 490bec5eb61Swanglei /* 49108e0e7c8SDavid Howells * look up an entry in a directory 49208e0e7c8SDavid Howells */ 493260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 49400cd8dd3SAl Viro unsigned int flags) 49508e0e7c8SDavid Howells { 49608e0e7c8SDavid Howells struct afs_vnode *vnode; 49708e0e7c8SDavid Howells struct afs_fid fid; 49808e0e7c8SDavid Howells struct inode *inode; 49900d3b7a4SDavid Howells struct key *key; 50008e0e7c8SDavid Howells int ret; 50108e0e7c8SDavid Howells 502260a9803SDavid Howells vnode = AFS_FS_I(dir); 503260a9803SDavid Howells 504416351f2SDavid Howells _enter("{%x:%u},%p{%s},", 505260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name); 506260a9803SDavid Howells 507260a9803SDavid Howells ASSERTCMP(dentry->d_inode, ==, NULL); 50808e0e7c8SDavid Howells 50945222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 51008e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 51108e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 51208e0e7c8SDavid Howells } 51308e0e7c8SDavid Howells 51408e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 51508e0e7c8SDavid Howells _leave(" = -ESTALE"); 51608e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 51708e0e7c8SDavid Howells } 51808e0e7c8SDavid Howells 51900d3b7a4SDavid Howells key = afs_request_key(vnode->volume->cell); 52000d3b7a4SDavid Howells if (IS_ERR(key)) { 52100d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 522e231c2eeSDavid Howells return ERR_CAST(key); 52300d3b7a4SDavid Howells } 52400d3b7a4SDavid Howells 525260a9803SDavid Howells ret = afs_validate(vnode, key); 52608e0e7c8SDavid Howells if (ret < 0) { 52700d3b7a4SDavid Howells key_put(key); 528260a9803SDavid Howells _leave(" = %d [val]", ret); 5291da177e4SLinus Torvalds return ERR_PTR(ret); 5301da177e4SLinus Torvalds } 5311da177e4SLinus Torvalds 532260a9803SDavid Howells ret = afs_do_lookup(dir, dentry, &fid, key); 533260a9803SDavid Howells if (ret < 0) { 534bec5eb61Swanglei inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid); 535bec5eb61Swanglei if (!IS_ERR(inode)) { 536bec5eb61Swanglei key_put(key); 537bec5eb61Swanglei goto success; 538bec5eb61Swanglei } 539bec5eb61Swanglei 540bec5eb61Swanglei ret = PTR_ERR(inode); 541260a9803SDavid Howells key_put(key); 542260a9803SDavid Howells if (ret == -ENOENT) { 543260a9803SDavid Howells d_add(dentry, NULL); 544260a9803SDavid Howells _leave(" = NULL [negative]"); 545260a9803SDavid Howells return NULL; 546260a9803SDavid Howells } 547260a9803SDavid Howells _leave(" = %d [do]", ret); 548260a9803SDavid Howells return ERR_PTR(ret); 549260a9803SDavid Howells } 550260a9803SDavid Howells dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; 551260a9803SDavid Howells 5521da177e4SLinus Torvalds /* instantiate the dentry */ 553260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); 55400d3b7a4SDavid Howells key_put(key); 55508e0e7c8SDavid Howells if (IS_ERR(inode)) { 55608e0e7c8SDavid Howells _leave(" = %ld", PTR_ERR(inode)); 557e231c2eeSDavid Howells return ERR_CAST(inode); 5581da177e4SLinus Torvalds } 5591da177e4SLinus Torvalds 560bec5eb61Swanglei success: 5611da177e4SLinus Torvalds d_add(dentry, inode); 562d6e43f75SDavid Howells _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }", 56308e0e7c8SDavid Howells fid.vnode, 56408e0e7c8SDavid Howells fid.unique, 5651da177e4SLinus Torvalds dentry->d_inode->i_ino, 566d6e43f75SDavid Howells dentry->d_inode->i_generation); 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds return NULL; 569ec26815aSDavid Howells } 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds /* 5721da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 5731da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 5741da177e4SLinus Torvalds * inode 5751da177e4SLinus Torvalds */ 5760b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 5771da177e4SLinus Torvalds { 578260a9803SDavid Howells struct afs_vnode *vnode, *dir; 579dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 5801da177e4SLinus Torvalds struct dentry *parent; 58100d3b7a4SDavid Howells struct key *key; 582260a9803SDavid Howells void *dir_version; 5831da177e4SLinus Torvalds int ret; 5841da177e4SLinus Torvalds 5850b728e19SAl Viro if (flags & LOOKUP_RCU) 58634286d66SNick Piggin return -ECHILD; 58734286d66SNick Piggin 58808e0e7c8SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 58908e0e7c8SDavid Howells 590260a9803SDavid Howells if (dentry->d_inode) 591260a9803SDavid Howells _enter("{v={%x:%u} n=%s fl=%lx},", 592260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name, 593260a9803SDavid Howells vnode->flags); 594260a9803SDavid Howells else 595260a9803SDavid Howells _enter("{neg n=%s}", dentry->d_name.name); 5961da177e4SLinus Torvalds 597260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 59800d3b7a4SDavid Howells if (IS_ERR(key)) 59900d3b7a4SDavid Howells key = NULL; 60000d3b7a4SDavid Howells 6011da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 60208e0e7c8SDavid Howells parent = dget_parent(dentry); 603260a9803SDavid Howells if (!parent->d_inode) 6041da177e4SLinus Torvalds goto out_bad; 6051da177e4SLinus Torvalds 606260a9803SDavid Howells dir = AFS_FS_I(parent->d_inode); 6071da177e4SLinus Torvalds 608260a9803SDavid Howells /* validate the parent directory */ 609260a9803SDavid Howells if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) 610260a9803SDavid Howells afs_validate(dir, key); 611260a9803SDavid Howells 612260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 6131da177e4SLinus Torvalds _debug("%s: parent dir deleted", dentry->d_name.name); 6141da177e4SLinus Torvalds goto out_bad; 6151da177e4SLinus Torvalds } 6161da177e4SLinus Torvalds 617260a9803SDavid Howells dir_version = (void *) (unsigned long) dir->status.data_version; 618260a9803SDavid Howells if (dentry->d_fsdata == dir_version) 619260a9803SDavid Howells goto out_valid; /* the dir contents are unchanged */ 620260a9803SDavid Howells 62108e0e7c8SDavid Howells _debug("dir modified"); 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds /* search the directory for this vnode */ 624260a9803SDavid Howells ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); 625260a9803SDavid Howells switch (ret) { 626260a9803SDavid Howells case 0: 627260a9803SDavid Howells /* the filename maps to something */ 628260a9803SDavid Howells if (!dentry->d_inode) 629260a9803SDavid Howells goto out_bad; 630260a9803SDavid Howells if (is_bad_inode(dentry->d_inode)) { 631260a9803SDavid Howells printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n", 632260a9803SDavid Howells parent->d_name.name, dentry->d_name.name); 6331da177e4SLinus Torvalds goto out_bad; 6341da177e4SLinus Torvalds } 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 6371da177e4SLinus Torvalds * different file */ 63808e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 63908e0e7c8SDavid Howells _debug("%s: dirent changed [%u != %u]", 64008e0e7c8SDavid Howells dentry->d_name.name, fid.vnode, 64108e0e7c8SDavid Howells vnode->fid.vnode); 6421da177e4SLinus Torvalds goto not_found; 6431da177e4SLinus Torvalds } 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 646260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 647260a9803SDavid Howells * been reused */ 64808e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 649d6e43f75SDavid Howells _debug("%s: file deleted (uq %u -> %u I:%u)", 65008e0e7c8SDavid Howells dentry->d_name.name, fid.unique, 6517a224228SJean Noel Cordenner vnode->fid.unique, 652d6e43f75SDavid Howells dentry->d_inode->i_generation); 65308e0e7c8SDavid Howells spin_lock(&vnode->lock); 65408e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 65508e0e7c8SDavid Howells spin_unlock(&vnode->lock); 656260a9803SDavid Howells goto not_found; 657260a9803SDavid Howells } 658260a9803SDavid Howells goto out_valid; 659260a9803SDavid Howells 660260a9803SDavid Howells case -ENOENT: 661260a9803SDavid Howells /* the filename is unknown */ 662260a9803SDavid Howells _debug("%s: dirent not found", dentry->d_name.name); 663260a9803SDavid Howells if (dentry->d_inode) 664260a9803SDavid Howells goto not_found; 665260a9803SDavid Howells goto out_valid; 666260a9803SDavid Howells 667260a9803SDavid Howells default: 668260a9803SDavid Howells _debug("failed to iterate dir %s: %d", 669260a9803SDavid Howells parent->d_name.name, ret); 6701da177e4SLinus Torvalds goto out_bad; 6711da177e4SLinus Torvalds } 67208e0e7c8SDavid Howells 6731da177e4SLinus Torvalds out_valid: 674260a9803SDavid Howells dentry->d_fsdata = dir_version; 675260a9803SDavid Howells out_skip: 6761da177e4SLinus Torvalds dput(parent); 67700d3b7a4SDavid Howells key_put(key); 6781da177e4SLinus Torvalds _leave(" = 1 [valid]"); 6791da177e4SLinus Torvalds return 1; 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 6821da177e4SLinus Torvalds not_found: 6831da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 6841da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 6851da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds out_bad: 688260a9803SDavid Howells if (dentry->d_inode) { 6891da177e4SLinus Torvalds /* don't unhash if we have submounts */ 6901da177e4SLinus Torvalds if (have_submounts(dentry)) 691260a9803SDavid Howells goto out_skip; 6921da177e4SLinus Torvalds } 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds _debug("dropping dentry %s/%s", 69508e0e7c8SDavid Howells parent->d_name.name, dentry->d_name.name); 69608e0e7c8SDavid Howells shrink_dcache_parent(dentry); 6971da177e4SLinus Torvalds d_drop(dentry); 6981da177e4SLinus Torvalds dput(parent); 69900d3b7a4SDavid Howells key_put(key); 7001da177e4SLinus Torvalds 7011da177e4SLinus Torvalds _leave(" = 0 [bad]"); 7021da177e4SLinus Torvalds return 0; 703ec26815aSDavid Howells } 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds /* 7061da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 7071da177e4SLinus Torvalds * sleep) 7081da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 7091da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 7101da177e4SLinus Torvalds */ 711fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 7121da177e4SLinus Torvalds { 7131da177e4SLinus Torvalds _enter("%s", dentry->d_name.name); 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 7161da177e4SLinus Torvalds goto zap; 7171da177e4SLinus Torvalds 71808e0e7c8SDavid Howells if (dentry->d_inode && 719bec5eb61Swanglei (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags) || 720bec5eb61Swanglei test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(dentry->d_inode)->flags))) 7211da177e4SLinus Torvalds goto zap; 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds _leave(" = 0 [keep]"); 7241da177e4SLinus Torvalds return 0; 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds zap: 7271da177e4SLinus Torvalds _leave(" = 1 [zap]"); 7281da177e4SLinus Torvalds return 1; 729ec26815aSDavid Howells } 730260a9803SDavid Howells 731260a9803SDavid Howells /* 732260a9803SDavid Howells * handle dentry release 733260a9803SDavid Howells */ 734260a9803SDavid Howells static void afs_d_release(struct dentry *dentry) 735260a9803SDavid Howells { 736260a9803SDavid Howells _enter("%s", dentry->d_name.name); 737260a9803SDavid Howells } 738260a9803SDavid Howells 739260a9803SDavid Howells /* 740260a9803SDavid Howells * create a directory on an AFS filesystem 741260a9803SDavid Howells */ 74218bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 743260a9803SDavid Howells { 744260a9803SDavid Howells struct afs_file_status status; 745260a9803SDavid Howells struct afs_callback cb; 746260a9803SDavid Howells struct afs_server *server; 747260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 748260a9803SDavid Howells struct afs_fid fid; 749260a9803SDavid Howells struct inode *inode; 750260a9803SDavid Howells struct key *key; 751260a9803SDavid Howells int ret; 752260a9803SDavid Howells 753260a9803SDavid Howells dvnode = AFS_FS_I(dir); 754260a9803SDavid Howells 75518bb1db3SAl Viro _enter("{%x:%u},{%s},%ho", 756260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 757260a9803SDavid Howells 758260a9803SDavid Howells ret = -ENAMETOOLONG; 75945222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 760260a9803SDavid Howells goto error; 761260a9803SDavid Howells 762260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 763260a9803SDavid Howells if (IS_ERR(key)) { 764260a9803SDavid Howells ret = PTR_ERR(key); 765260a9803SDavid Howells goto error; 766260a9803SDavid Howells } 767260a9803SDavid Howells 768260a9803SDavid Howells mode |= S_IFDIR; 769260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 770260a9803SDavid Howells mode, &fid, &status, &cb, &server); 771260a9803SDavid Howells if (ret < 0) 772260a9803SDavid Howells goto mkdir_error; 773260a9803SDavid Howells 774260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 775260a9803SDavid Howells if (IS_ERR(inode)) { 776260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 777260a9803SDavid Howells * directory on the server */ 778260a9803SDavid Howells ret = PTR_ERR(inode); 779260a9803SDavid Howells goto iget_error; 780260a9803SDavid Howells } 781260a9803SDavid Howells 782260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 783260a9803SDavid Howells vnode = AFS_FS_I(inode); 784260a9803SDavid Howells spin_lock(&vnode->lock); 785260a9803SDavid Howells vnode->update_cnt++; 786260a9803SDavid Howells spin_unlock(&vnode->lock); 787260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 788260a9803SDavid Howells afs_put_server(server); 789260a9803SDavid Howells 790260a9803SDavid Howells d_instantiate(dentry, inode); 791260a9803SDavid Howells if (d_unhashed(dentry)) { 792260a9803SDavid Howells _debug("not hashed"); 793260a9803SDavid Howells d_rehash(dentry); 794260a9803SDavid Howells } 795260a9803SDavid Howells key_put(key); 796260a9803SDavid Howells _leave(" = 0"); 797260a9803SDavid Howells return 0; 798260a9803SDavid Howells 799260a9803SDavid Howells iget_error: 800260a9803SDavid Howells afs_put_server(server); 801260a9803SDavid Howells mkdir_error: 802260a9803SDavid Howells key_put(key); 803260a9803SDavid Howells error: 804260a9803SDavid Howells d_drop(dentry); 805260a9803SDavid Howells _leave(" = %d", ret); 806260a9803SDavid Howells return ret; 807260a9803SDavid Howells } 808260a9803SDavid Howells 809260a9803SDavid Howells /* 810260a9803SDavid Howells * remove a directory from an AFS filesystem 811260a9803SDavid Howells */ 812260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 813260a9803SDavid Howells { 814260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 815260a9803SDavid Howells struct key *key; 816260a9803SDavid Howells int ret; 817260a9803SDavid Howells 818260a9803SDavid Howells dvnode = AFS_FS_I(dir); 819260a9803SDavid Howells 820416351f2SDavid Howells _enter("{%x:%u},{%s}", 821260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 822260a9803SDavid Howells 823260a9803SDavid Howells ret = -ENAMETOOLONG; 82445222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 825260a9803SDavid Howells goto error; 826260a9803SDavid Howells 827260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 828260a9803SDavid Howells if (IS_ERR(key)) { 829260a9803SDavid Howells ret = PTR_ERR(key); 830260a9803SDavid Howells goto error; 831260a9803SDavid Howells } 832260a9803SDavid Howells 833260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); 834260a9803SDavid Howells if (ret < 0) 835260a9803SDavid Howells goto rmdir_error; 836260a9803SDavid Howells 837260a9803SDavid Howells if (dentry->d_inode) { 838260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 839260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 840260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 841260a9803SDavid Howells afs_discard_callback_on_delete(vnode); 842260a9803SDavid Howells } 843260a9803SDavid Howells 844260a9803SDavid Howells key_put(key); 845260a9803SDavid Howells _leave(" = 0"); 846260a9803SDavid Howells return 0; 847260a9803SDavid Howells 848260a9803SDavid Howells rmdir_error: 849260a9803SDavid Howells key_put(key); 850260a9803SDavid Howells error: 851260a9803SDavid Howells _leave(" = %d", ret); 852260a9803SDavid Howells return ret; 853260a9803SDavid Howells } 854260a9803SDavid Howells 855260a9803SDavid Howells /* 856260a9803SDavid Howells * remove a file from an AFS filesystem 857260a9803SDavid Howells */ 858260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 859260a9803SDavid Howells { 860260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 861260a9803SDavid Howells struct key *key; 862260a9803SDavid Howells int ret; 863260a9803SDavid Howells 864260a9803SDavid Howells dvnode = AFS_FS_I(dir); 865260a9803SDavid Howells 866416351f2SDavid Howells _enter("{%x:%u},{%s}", 867260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 868260a9803SDavid Howells 869260a9803SDavid Howells ret = -ENAMETOOLONG; 87045222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 871260a9803SDavid Howells goto error; 872260a9803SDavid Howells 873260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 874260a9803SDavid Howells if (IS_ERR(key)) { 875260a9803SDavid Howells ret = PTR_ERR(key); 876260a9803SDavid Howells goto error; 877260a9803SDavid Howells } 878260a9803SDavid Howells 879260a9803SDavid Howells if (dentry->d_inode) { 880260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 881260a9803SDavid Howells 882260a9803SDavid Howells /* make sure we have a callback promise on the victim */ 883260a9803SDavid Howells ret = afs_validate(vnode, key); 884260a9803SDavid Howells if (ret < 0) 885260a9803SDavid Howells goto error; 886260a9803SDavid Howells } 887260a9803SDavid Howells 888260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); 889260a9803SDavid Howells if (ret < 0) 890260a9803SDavid Howells goto remove_error; 891260a9803SDavid Howells 892260a9803SDavid Howells if (dentry->d_inode) { 893260a9803SDavid Howells /* if the file wasn't deleted due to excess hard links, the 894260a9803SDavid Howells * fileserver will break the callback promise on the file - if 895260a9803SDavid Howells * it had one - before it returns to us, and if it was deleted, 896260a9803SDavid Howells * it won't 897260a9803SDavid Howells * 898260a9803SDavid Howells * however, if we didn't have a callback promise outstanding, 899260a9803SDavid Howells * or it was outstanding on a different server, then it won't 900260a9803SDavid Howells * break it either... 901260a9803SDavid Howells */ 902260a9803SDavid Howells vnode = AFS_FS_I(dentry->d_inode); 903260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 904260a9803SDavid Howells _debug("AFS_VNODE_DELETED"); 905260a9803SDavid Howells if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) 906260a9803SDavid Howells _debug("AFS_VNODE_CB_BROKEN"); 907260a9803SDavid Howells set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); 908260a9803SDavid Howells ret = afs_validate(vnode, key); 909260a9803SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 910260a9803SDavid Howells } 911260a9803SDavid Howells 912260a9803SDavid Howells key_put(key); 913260a9803SDavid Howells _leave(" = 0"); 914260a9803SDavid Howells return 0; 915260a9803SDavid Howells 916260a9803SDavid Howells remove_error: 917260a9803SDavid Howells key_put(key); 918260a9803SDavid Howells error: 919260a9803SDavid Howells _leave(" = %d", ret); 920260a9803SDavid Howells return ret; 921260a9803SDavid Howells } 922260a9803SDavid Howells 923260a9803SDavid Howells /* 924260a9803SDavid Howells * create a regular file on an AFS filesystem 925260a9803SDavid Howells */ 9264acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 927ebfc3b49SAl Viro bool excl) 928260a9803SDavid Howells { 929260a9803SDavid Howells struct afs_file_status status; 930260a9803SDavid Howells struct afs_callback cb; 931260a9803SDavid Howells struct afs_server *server; 932260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 933260a9803SDavid Howells struct afs_fid fid; 934260a9803SDavid Howells struct inode *inode; 935260a9803SDavid Howells struct key *key; 936260a9803SDavid Howells int ret; 937260a9803SDavid Howells 938260a9803SDavid Howells dvnode = AFS_FS_I(dir); 939260a9803SDavid Howells 9404acdaf27SAl Viro _enter("{%x:%u},{%s},%ho,", 941260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 942260a9803SDavid Howells 943260a9803SDavid Howells ret = -ENAMETOOLONG; 94445222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 945260a9803SDavid Howells goto error; 946260a9803SDavid Howells 947260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 948260a9803SDavid Howells if (IS_ERR(key)) { 949260a9803SDavid Howells ret = PTR_ERR(key); 950260a9803SDavid Howells goto error; 951260a9803SDavid Howells } 952260a9803SDavid Howells 953260a9803SDavid Howells mode |= S_IFREG; 954260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 955260a9803SDavid Howells mode, &fid, &status, &cb, &server); 956260a9803SDavid Howells if (ret < 0) 957260a9803SDavid Howells goto create_error; 958260a9803SDavid Howells 959260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 960260a9803SDavid Howells if (IS_ERR(inode)) { 961260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 962260a9803SDavid Howells * directory on the server */ 963260a9803SDavid Howells ret = PTR_ERR(inode); 964260a9803SDavid Howells goto iget_error; 965260a9803SDavid Howells } 966260a9803SDavid Howells 967260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 968260a9803SDavid Howells vnode = AFS_FS_I(inode); 969260a9803SDavid Howells spin_lock(&vnode->lock); 970260a9803SDavid Howells vnode->update_cnt++; 971260a9803SDavid Howells spin_unlock(&vnode->lock); 972260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 973260a9803SDavid Howells afs_put_server(server); 974260a9803SDavid Howells 975260a9803SDavid Howells d_instantiate(dentry, inode); 976260a9803SDavid Howells if (d_unhashed(dentry)) { 977260a9803SDavid Howells _debug("not hashed"); 978260a9803SDavid Howells d_rehash(dentry); 979260a9803SDavid Howells } 980260a9803SDavid Howells key_put(key); 981260a9803SDavid Howells _leave(" = 0"); 982260a9803SDavid Howells return 0; 983260a9803SDavid Howells 984260a9803SDavid Howells iget_error: 985260a9803SDavid Howells afs_put_server(server); 986260a9803SDavid Howells create_error: 987260a9803SDavid Howells key_put(key); 988260a9803SDavid Howells error: 989260a9803SDavid Howells d_drop(dentry); 990260a9803SDavid Howells _leave(" = %d", ret); 991260a9803SDavid Howells return ret; 992260a9803SDavid Howells } 993260a9803SDavid Howells 994260a9803SDavid Howells /* 995260a9803SDavid Howells * create a hard link between files in an AFS filesystem 996260a9803SDavid Howells */ 997260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 998260a9803SDavid Howells struct dentry *dentry) 999260a9803SDavid Howells { 1000260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1001260a9803SDavid Howells struct key *key; 1002260a9803SDavid Howells int ret; 1003260a9803SDavid Howells 1004260a9803SDavid Howells vnode = AFS_FS_I(from->d_inode); 1005260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1006260a9803SDavid Howells 1007416351f2SDavid Howells _enter("{%x:%u},{%x:%u},{%s}", 1008260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1009260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 1010260a9803SDavid Howells dentry->d_name.name); 1011260a9803SDavid Howells 1012260a9803SDavid Howells ret = -ENAMETOOLONG; 101345222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1014260a9803SDavid Howells goto error; 1015260a9803SDavid Howells 1016260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1017260a9803SDavid Howells if (IS_ERR(key)) { 1018260a9803SDavid Howells ret = PTR_ERR(key); 1019260a9803SDavid Howells goto error; 1020260a9803SDavid Howells } 1021260a9803SDavid Howells 1022260a9803SDavid Howells ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); 1023260a9803SDavid Howells if (ret < 0) 1024260a9803SDavid Howells goto link_error; 1025260a9803SDavid Howells 10267de9c6eeSAl Viro ihold(&vnode->vfs_inode); 1027260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1028260a9803SDavid Howells key_put(key); 1029260a9803SDavid Howells _leave(" = 0"); 1030260a9803SDavid Howells return 0; 1031260a9803SDavid Howells 1032260a9803SDavid Howells link_error: 1033260a9803SDavid Howells key_put(key); 1034260a9803SDavid Howells error: 1035260a9803SDavid Howells d_drop(dentry); 1036260a9803SDavid Howells _leave(" = %d", ret); 1037260a9803SDavid Howells return ret; 1038260a9803SDavid Howells } 1039260a9803SDavid Howells 1040260a9803SDavid Howells /* 1041260a9803SDavid Howells * create a symlink in an AFS filesystem 1042260a9803SDavid Howells */ 1043260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1044260a9803SDavid Howells const char *content) 1045260a9803SDavid Howells { 1046260a9803SDavid Howells struct afs_file_status status; 1047260a9803SDavid Howells struct afs_server *server; 1048260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1049260a9803SDavid Howells struct afs_fid fid; 1050260a9803SDavid Howells struct inode *inode; 1051260a9803SDavid Howells struct key *key; 1052260a9803SDavid Howells int ret; 1053260a9803SDavid Howells 1054260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1055260a9803SDavid Howells 1056416351f2SDavid Howells _enter("{%x:%u},{%s},%s", 1057260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, 1058260a9803SDavid Howells content); 1059260a9803SDavid Howells 1060260a9803SDavid Howells ret = -ENAMETOOLONG; 106145222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 1062260a9803SDavid Howells goto error; 1063260a9803SDavid Howells 1064260a9803SDavid Howells ret = -EINVAL; 106545222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1066260a9803SDavid Howells goto error; 1067260a9803SDavid Howells 1068260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1069260a9803SDavid Howells if (IS_ERR(key)) { 1070260a9803SDavid Howells ret = PTR_ERR(key); 1071260a9803SDavid Howells goto error; 1072260a9803SDavid Howells } 1073260a9803SDavid Howells 1074260a9803SDavid Howells ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, 1075260a9803SDavid Howells &fid, &status, &server); 1076260a9803SDavid Howells if (ret < 0) 1077260a9803SDavid Howells goto create_error; 1078260a9803SDavid Howells 1079260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); 1080260a9803SDavid Howells if (IS_ERR(inode)) { 1081260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 1082260a9803SDavid Howells * directory on the server */ 1083260a9803SDavid Howells ret = PTR_ERR(inode); 1084260a9803SDavid Howells goto iget_error; 1085260a9803SDavid Howells } 1086260a9803SDavid Howells 1087260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 1088260a9803SDavid Howells vnode = AFS_FS_I(inode); 1089260a9803SDavid Howells spin_lock(&vnode->lock); 1090260a9803SDavid Howells vnode->update_cnt++; 1091260a9803SDavid Howells spin_unlock(&vnode->lock); 1092260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 1093260a9803SDavid Howells afs_put_server(server); 1094260a9803SDavid Howells 1095260a9803SDavid Howells d_instantiate(dentry, inode); 1096260a9803SDavid Howells if (d_unhashed(dentry)) { 1097260a9803SDavid Howells _debug("not hashed"); 1098260a9803SDavid Howells d_rehash(dentry); 1099260a9803SDavid Howells } 1100260a9803SDavid Howells key_put(key); 1101260a9803SDavid Howells _leave(" = 0"); 1102260a9803SDavid Howells return 0; 1103260a9803SDavid Howells 1104260a9803SDavid Howells iget_error: 1105260a9803SDavid Howells afs_put_server(server); 1106260a9803SDavid Howells create_error: 1107260a9803SDavid Howells key_put(key); 1108260a9803SDavid Howells error: 1109260a9803SDavid Howells d_drop(dentry); 1110260a9803SDavid Howells _leave(" = %d", ret); 1111260a9803SDavid Howells return ret; 1112260a9803SDavid Howells } 1113260a9803SDavid Howells 1114260a9803SDavid Howells /* 1115260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1116260a9803SDavid Howells */ 1117260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 1118260a9803SDavid Howells struct inode *new_dir, struct dentry *new_dentry) 1119260a9803SDavid Howells { 1120260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1121260a9803SDavid Howells struct key *key; 1122260a9803SDavid Howells int ret; 1123260a9803SDavid Howells 1124260a9803SDavid Howells vnode = AFS_FS_I(old_dentry->d_inode); 1125260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1126260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1127260a9803SDavid Howells 1128416351f2SDavid Howells _enter("{%x:%u},{%x:%u},{%x:%u},{%s}", 1129260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1130260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1131260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1132260a9803SDavid Howells new_dentry->d_name.name); 1133260a9803SDavid Howells 1134260a9803SDavid Howells ret = -ENAMETOOLONG; 113545222b9eSDavid Howells if (new_dentry->d_name.len >= AFSNAMEMAX) 1136260a9803SDavid Howells goto error; 1137260a9803SDavid Howells 1138260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1139260a9803SDavid Howells if (IS_ERR(key)) { 1140260a9803SDavid Howells ret = PTR_ERR(key); 1141260a9803SDavid Howells goto error; 1142260a9803SDavid Howells } 1143260a9803SDavid Howells 1144260a9803SDavid Howells ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, 1145260a9803SDavid Howells old_dentry->d_name.name, 1146260a9803SDavid Howells new_dentry->d_name.name); 1147260a9803SDavid Howells if (ret < 0) 1148260a9803SDavid Howells goto rename_error; 1149260a9803SDavid Howells key_put(key); 1150260a9803SDavid Howells _leave(" = 0"); 1151260a9803SDavid Howells return 0; 1152260a9803SDavid Howells 1153260a9803SDavid Howells rename_error: 1154260a9803SDavid Howells key_put(key); 1155260a9803SDavid Howells error: 1156260a9803SDavid Howells d_drop(new_dentry); 1157260a9803SDavid Howells _leave(" = %d", ret); 1158260a9803SDavid Howells return ret; 1159260a9803SDavid Howells } 1160