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); 29ac7576f4SMiklos Szeredi static int afs_lookup_filldir(struct dir_context *ctx, 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, 411cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 421cd66c93SMiklos Szeredi unsigned int flags); 431da177e4SLinus Torvalds 444b6f5d20SArjan van de Ven const struct file_operations afs_dir_file_operations = { 451da177e4SLinus Torvalds .open = afs_dir_open, 4600d3b7a4SDavid Howells .release = afs_release, 4729884effSAl Viro .iterate_shared = afs_readdir, 48e8d6c554SDavid Howells .lock = afs_lock, 493222a3e5SChristoph Hellwig .llseek = generic_file_llseek, 501da177e4SLinus Torvalds }; 511da177e4SLinus Torvalds 52754661f1SArjan van de Ven const struct inode_operations afs_dir_inode_operations = { 53260a9803SDavid Howells .create = afs_create, 54260a9803SDavid Howells .lookup = afs_lookup, 55260a9803SDavid Howells .link = afs_link, 56260a9803SDavid Howells .unlink = afs_unlink, 57260a9803SDavid Howells .symlink = afs_symlink, 58260a9803SDavid Howells .mkdir = afs_mkdir, 59260a9803SDavid Howells .rmdir = afs_rmdir, 602773bf00SMiklos Szeredi .rename = afs_rename, 6100d3b7a4SDavid Howells .permission = afs_permission, 62416351f2SDavid Howells .getattr = afs_getattr, 6331143d5dSDavid Howells .setattr = afs_setattr, 64d3e3b7eaSDavid Howells .listxattr = afs_listxattr, 651da177e4SLinus Torvalds }; 661da177e4SLinus Torvalds 67d61dcce2SAl Viro const struct dentry_operations afs_fs_dentry_operations = { 681da177e4SLinus Torvalds .d_revalidate = afs_d_revalidate, 691da177e4SLinus Torvalds .d_delete = afs_d_delete, 70260a9803SDavid Howells .d_release = afs_d_release, 71d18610b0SDavid Howells .d_automount = afs_d_automount, 721da177e4SLinus Torvalds }; 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds #define AFS_DIR_HASHTBL_SIZE 128 751da177e4SLinus Torvalds #define AFS_DIR_DIRENT_SIZE 32 761da177e4SLinus Torvalds #define AFS_DIRENT_PER_BLOCK 64 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds union afs_dirent { 791da177e4SLinus Torvalds struct { 801da177e4SLinus Torvalds uint8_t valid; 811da177e4SLinus Torvalds uint8_t unused[1]; 821da177e4SLinus Torvalds __be16 hash_next; 831da177e4SLinus Torvalds __be32 vnode; 841da177e4SLinus Torvalds __be32 unique; 851da177e4SLinus Torvalds uint8_t name[16]; 861da177e4SLinus Torvalds uint8_t overflow[4]; /* if any char of the name (inc 871da177e4SLinus Torvalds * NUL) reaches here, consume 881da177e4SLinus Torvalds * the next dirent too */ 891da177e4SLinus Torvalds } u; 901da177e4SLinus Torvalds uint8_t extended_name[32]; 911da177e4SLinus Torvalds }; 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ 941da177e4SLinus Torvalds struct afs_dir_pagehdr { 951da177e4SLinus Torvalds __be16 npages; 961da177e4SLinus Torvalds __be16 magic; 971da177e4SLinus Torvalds #define AFS_DIR_MAGIC htons(1234) 981da177e4SLinus Torvalds uint8_t nentries; 991da177e4SLinus Torvalds uint8_t bitmap[8]; 1001da177e4SLinus Torvalds uint8_t pad[19]; 1011da177e4SLinus Torvalds }; 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds /* directory block layout */ 1041da177e4SLinus Torvalds union afs_dir_block { 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds struct { 1091da177e4SLinus Torvalds struct afs_dir_pagehdr pagehdr; 1101da177e4SLinus Torvalds uint8_t alloc_ctrs[128]; 1111da177e4SLinus Torvalds /* dir hash table */ 1121da177e4SLinus Torvalds uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; 1131da177e4SLinus Torvalds } hdr; 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; 1161da177e4SLinus Torvalds }; 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds /* layout on a linux VM page */ 1191da177e4SLinus Torvalds struct afs_dir_page { 1201da177e4SLinus Torvalds union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; 1211da177e4SLinus Torvalds }; 1221da177e4SLinus Torvalds 123260a9803SDavid Howells struct afs_lookup_cookie { 1241bbae9f8SAl Viro struct dir_context ctx; 1251da177e4SLinus Torvalds struct afs_fid fid; 1261bbae9f8SAl Viro struct qstr name; 1271da177e4SLinus Torvalds int found; 1281da177e4SLinus Torvalds }; 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds /* 1311da177e4SLinus Torvalds * check that a directory page is valid 1321da177e4SLinus Torvalds */ 133be5b82dbSAl Viro static inline bool afs_dir_check_page(struct inode *dir, struct page *page) 1341da177e4SLinus Torvalds { 1351da177e4SLinus Torvalds struct afs_dir_page *dbuf; 1361da177e4SLinus Torvalds loff_t latter; 1371da177e4SLinus Torvalds int tmp, qty; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds #if 0 1401da177e4SLinus Torvalds /* check the page count */ 1411da177e4SLinus Torvalds qty = desc.size / sizeof(dbuf->blocks[0]); 1421da177e4SLinus Torvalds if (qty == 0) 1431da177e4SLinus Torvalds goto error; 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { 1461da177e4SLinus Torvalds printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", 147530b6412SHarvey Harrison __func__, dir->i_ino, qty, 14808e0e7c8SDavid Howells ntohs(dbuf->blocks[0].pagehdr.npages)); 1491da177e4SLinus Torvalds goto error; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds #endif 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds /* determine how many magic numbers there should be in this page */ 15454b21a79SAndrew Morton latter = dir->i_size - page_offset(page); 1551da177e4SLinus Torvalds if (latter >= PAGE_SIZE) 1561da177e4SLinus Torvalds qty = PAGE_SIZE; 1571da177e4SLinus Torvalds else 1581da177e4SLinus Torvalds qty = latter; 1591da177e4SLinus Torvalds qty /= sizeof(union afs_dir_block); 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds /* check them */ 1621da177e4SLinus Torvalds dbuf = page_address(page); 1631da177e4SLinus Torvalds for (tmp = 0; tmp < qty; tmp++) { 1641da177e4SLinus Torvalds if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { 1651da177e4SLinus Torvalds printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n", 166530b6412SHarvey Harrison __func__, dir->i_ino, tmp, qty, 1671da177e4SLinus Torvalds ntohs(dbuf->blocks[tmp].pagehdr.magic)); 1681da177e4SLinus Torvalds goto error; 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds } 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds SetPageChecked(page); 173be5b82dbSAl Viro return true; 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds error: 1761da177e4SLinus Torvalds SetPageError(page); 177be5b82dbSAl Viro return false; 178ec26815aSDavid Howells } 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds /* 1811da177e4SLinus Torvalds * discard a page cached in the pagecache 1821da177e4SLinus Torvalds */ 1831da177e4SLinus Torvalds static inline void afs_dir_put_page(struct page *page) 1841da177e4SLinus Torvalds { 1851da177e4SLinus Torvalds kunmap(page); 18609cbfeafSKirill A. Shutemov put_page(page); 187ec26815aSDavid Howells } 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds /* 1901da177e4SLinus Torvalds * get a page into the pagecache 1911da177e4SLinus Torvalds */ 19200d3b7a4SDavid Howells static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, 19300d3b7a4SDavid Howells struct key *key) 1941da177e4SLinus Torvalds { 1951da177e4SLinus Torvalds struct page *page; 1961da177e4SLinus Torvalds _enter("{%lu},%lu", dir->i_ino, index); 1971da177e4SLinus Torvalds 198f6d335c0SAl Viro page = read_cache_page(dir->i_mapping, index, afs_page_filler, key); 1991da177e4SLinus Torvalds if (!IS_ERR(page)) { 2001da177e4SLinus Torvalds kmap(page); 201be5b82dbSAl Viro if (unlikely(!PageChecked(page))) { 202be5b82dbSAl Viro if (PageError(page) || !afs_dir_check_page(dir, page)) 2031da177e4SLinus Torvalds goto fail; 2041da177e4SLinus Torvalds } 205be5b82dbSAl Viro } 2061da177e4SLinus Torvalds return page; 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds fail: 2091da177e4SLinus Torvalds afs_dir_put_page(page); 21008e0e7c8SDavid Howells _leave(" = -EIO"); 2111da177e4SLinus Torvalds return ERR_PTR(-EIO); 212ec26815aSDavid Howells } 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds /* 2151da177e4SLinus Torvalds * open an AFS directory file 2161da177e4SLinus Torvalds */ 2171da177e4SLinus Torvalds static int afs_dir_open(struct inode *inode, struct file *file) 2181da177e4SLinus Torvalds { 2191da177e4SLinus Torvalds _enter("{%lu}", inode->i_ino); 2201da177e4SLinus Torvalds 2212ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 2222ecd05aeSAlexey Dobriyan BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 2231da177e4SLinus Torvalds 22408e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 2251da177e4SLinus Torvalds return -ENOENT; 2261da177e4SLinus Torvalds 22700d3b7a4SDavid Howells return afs_open(inode, file); 228ec26815aSDavid Howells } 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds /* 2311da177e4SLinus Torvalds * deal with one block in an AFS directory 2321da177e4SLinus Torvalds */ 2331bbae9f8SAl Viro static int afs_dir_iterate_block(struct dir_context *ctx, 2341da177e4SLinus Torvalds union afs_dir_block *block, 2351bbae9f8SAl Viro unsigned blkoff) 2361da177e4SLinus Torvalds { 2371da177e4SLinus Torvalds union afs_dirent *dire; 2381da177e4SLinus Torvalds unsigned offset, next, curr; 2391da177e4SLinus Torvalds size_t nlen; 2401bbae9f8SAl Viro int tmp; 2411da177e4SLinus Torvalds 2421bbae9f8SAl Viro _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 2431da177e4SLinus Torvalds 2441bbae9f8SAl Viro curr = (ctx->pos - 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)))) { 2565b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]: unused", 2571da177e4SLinus Torvalds blkoff / sizeof(union afs_dir_block), offset); 2581da177e4SLinus Torvalds if (offset >= curr) 2591bbae9f8SAl Viro ctx->pos = 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 2705b5e0928SAlexey Dobriyan _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) { 2785b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 2791da177e4SLinus Torvalds " %u travelled beyond end dir block" 2805b5e0928SAlexey Dobriyan " (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)))) { 2875b5e0928SAlexey Dobriyan _debug("ENT[%zu.%u]:" 2885b5e0928SAlexey Dobriyan " %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 2945b5e0928SAlexey Dobriyan _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 */ 3051bbae9f8SAl Viro if (!dir_emit(ctx, dire->u.name, nlen, 3061da177e4SLinus Torvalds ntohl(dire->u.vnode), 3071bbae9f8SAl Viro ctx->actor == afs_lookup_filldir ? 3081bbae9f8SAl Viro ntohl(dire->u.unique) : DT_UNKNOWN)) { 3091da177e4SLinus Torvalds _leave(" = 0 [full]"); 3101da177e4SLinus Torvalds return 0; 3111da177e4SLinus Torvalds } 3121da177e4SLinus Torvalds 3131bbae9f8SAl Viro ctx->pos = blkoff + next * sizeof(union afs_dirent); 3141da177e4SLinus Torvalds } 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds _leave(" = 1 [more]"); 3171da177e4SLinus Torvalds return 1; 318ec26815aSDavid Howells } 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds /* 32108e0e7c8SDavid Howells * iterate through the data blob that lists the contents of an AFS directory 3221da177e4SLinus Torvalds */ 3231bbae9f8SAl Viro static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 3241bbae9f8SAl Viro struct key *key) 3251da177e4SLinus Torvalds { 3261da177e4SLinus Torvalds union afs_dir_block *dblock; 3271da177e4SLinus Torvalds struct afs_dir_page *dbuf; 3281da177e4SLinus Torvalds struct page *page; 3291da177e4SLinus Torvalds unsigned blkoff, limit; 3301da177e4SLinus Torvalds int ret; 3311da177e4SLinus Torvalds 3321bbae9f8SAl Viro _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 3331da177e4SLinus Torvalds 33408e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 3351da177e4SLinus Torvalds _leave(" = -ESTALE"); 3361da177e4SLinus Torvalds return -ESTALE; 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds /* round the file position up to the next entry boundary */ 3401bbae9f8SAl Viro ctx->pos += sizeof(union afs_dirent) - 1; 3411bbae9f8SAl Viro ctx->pos &= ~(sizeof(union afs_dirent) - 1); 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds /* walk through the blocks in sequence */ 3441da177e4SLinus Torvalds ret = 0; 3451bbae9f8SAl Viro while (ctx->pos < dir->i_size) { 3461bbae9f8SAl Viro blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1); 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds /* fetch the appropriate page from the directory */ 34900d3b7a4SDavid Howells page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); 3501da177e4SLinus Torvalds if (IS_ERR(page)) { 3511da177e4SLinus Torvalds ret = PTR_ERR(page); 3521da177e4SLinus Torvalds break; 3531da177e4SLinus Torvalds } 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds limit = blkoff & ~(PAGE_SIZE - 1); 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds dbuf = page_address(page); 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds /* deal with the individual blocks stashed on this page */ 3601da177e4SLinus Torvalds do { 3611da177e4SLinus Torvalds dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 3621da177e4SLinus Torvalds sizeof(union afs_dir_block)]; 3631bbae9f8SAl Viro ret = afs_dir_iterate_block(ctx, dblock, blkoff); 3641da177e4SLinus Torvalds if (ret != 1) { 3651da177e4SLinus Torvalds afs_dir_put_page(page); 3661da177e4SLinus Torvalds goto out; 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds blkoff += sizeof(union afs_dir_block); 3701da177e4SLinus Torvalds 3711bbae9f8SAl Viro } while (ctx->pos < dir->i_size && blkoff < limit); 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds afs_dir_put_page(page); 3741da177e4SLinus Torvalds ret = 0; 3751da177e4SLinus Torvalds } 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds out: 3781da177e4SLinus Torvalds _leave(" = %d", ret); 3791da177e4SLinus Torvalds return ret; 380ec26815aSDavid Howells } 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds /* 3831da177e4SLinus Torvalds * read an AFS directory 3841da177e4SLinus Torvalds */ 3851bbae9f8SAl Viro static int afs_readdir(struct file *file, struct dir_context *ctx) 3861da177e4SLinus Torvalds { 3871bbae9f8SAl Viro return afs_dir_iterate(file_inode(file), 3881bbae9f8SAl Viro ctx, file->private_data); 389ec26815aSDavid Howells } 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds /* 3921da177e4SLinus Torvalds * search the directory for a name 3931da177e4SLinus Torvalds * - if afs_dir_iterate_block() spots this function, it'll pass the FID 3941da177e4SLinus Torvalds * uniquifier through dtype 3951da177e4SLinus Torvalds */ 396ac7576f4SMiklos Szeredi static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 397ac7576f4SMiklos Szeredi int nlen, loff_t fpos, u64 ino, unsigned dtype) 3981da177e4SLinus Torvalds { 399ac7576f4SMiklos Szeredi struct afs_lookup_cookie *cookie = 400ac7576f4SMiklos Szeredi container_of(ctx, struct afs_lookup_cookie, ctx); 4011da177e4SLinus Torvalds 4021bbae9f8SAl Viro _enter("{%s,%u},%s,%u,,%llu,%u", 4031bbae9f8SAl Viro cookie->name.name, cookie->name.len, name, nlen, 404ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 4051da177e4SLinus Torvalds 40608e0e7c8SDavid Howells /* insanity checks first */ 40708e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 40808e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 40908e0e7c8SDavid Howells 4101bbae9f8SAl Viro if (cookie->name.len != nlen || 4111bbae9f8SAl Viro memcmp(cookie->name.name, name, nlen) != 0) { 4121da177e4SLinus Torvalds _leave(" = 0 [no]"); 4131da177e4SLinus Torvalds return 0; 4141da177e4SLinus Torvalds } 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds cookie->fid.vnode = ino; 4171da177e4SLinus Torvalds cookie->fid.unique = dtype; 4181da177e4SLinus Torvalds cookie->found = 1; 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds _leave(" = -1 [found]"); 4211da177e4SLinus Torvalds return -1; 422ec26815aSDavid Howells } 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds /* 42508e0e7c8SDavid Howells * do a lookup in a directory 426260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 4271da177e4SLinus Torvalds */ 42808e0e7c8SDavid Howells static int afs_do_lookup(struct inode *dir, struct dentry *dentry, 42900d3b7a4SDavid Howells struct afs_fid *fid, struct key *key) 4301da177e4SLinus Torvalds { 4311bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 4321bbae9f8SAl Viro struct afs_lookup_cookie cookie = { 4331bbae9f8SAl Viro .ctx.actor = afs_lookup_filldir, 4341bbae9f8SAl Viro .name = dentry->d_name, 4351bbae9f8SAl Viro .fid.vid = as->volume->vid 4361bbae9f8SAl Viro }; 4371da177e4SLinus Torvalds int ret; 4381da177e4SLinus Torvalds 439a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds /* search the directory */ 4421bbae9f8SAl Viro ret = afs_dir_iterate(dir, &cookie.ctx, key); 4431da177e4SLinus Torvalds if (ret < 0) { 44408e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 44508e0e7c8SDavid Howells return ret; 4461da177e4SLinus Torvalds } 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds ret = -ENOENT; 4491da177e4SLinus Torvalds if (!cookie.found) { 45008e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 45108e0e7c8SDavid Howells return -ENOENT; 45208e0e7c8SDavid Howells } 45308e0e7c8SDavid Howells 45408e0e7c8SDavid Howells *fid = cookie.fid; 45508e0e7c8SDavid Howells _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); 45608e0e7c8SDavid Howells return 0; 45708e0e7c8SDavid Howells } 45808e0e7c8SDavid Howells 45908e0e7c8SDavid Howells /* 460bec5eb61Swanglei * Try to auto mount the mountpoint with pseudo directory, if the autocell 461bec5eb61Swanglei * operation is setted. 462bec5eb61Swanglei */ 463bec5eb61Swanglei static struct inode *afs_try_auto_mntpt( 464bec5eb61Swanglei int ret, struct dentry *dentry, struct inode *dir, struct key *key, 465bec5eb61Swanglei struct afs_fid *fid) 466bec5eb61Swanglei { 467bec5eb61Swanglei const char *devname = dentry->d_name.name; 468bec5eb61Swanglei struct afs_vnode *vnode = AFS_FS_I(dir); 469bec5eb61Swanglei struct inode *inode; 470bec5eb61Swanglei 471a455589fSAl Viro _enter("%d, %p{%pd}, {%x:%u}, %p", 472a455589fSAl Viro ret, dentry, dentry, vnode->fid.vid, vnode->fid.vnode, key); 473bec5eb61Swanglei 474bec5eb61Swanglei if (ret != -ENOENT || 475bec5eb61Swanglei !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags)) 476bec5eb61Swanglei goto out; 477bec5eb61Swanglei 478bec5eb61Swanglei inode = afs_iget_autocell(dir, devname, strlen(devname), key); 479bec5eb61Swanglei if (IS_ERR(inode)) { 480bec5eb61Swanglei ret = PTR_ERR(inode); 481bec5eb61Swanglei goto out; 482bec5eb61Swanglei } 483bec5eb61Swanglei 484bec5eb61Swanglei *fid = AFS_FS_I(inode)->fid; 485bec5eb61Swanglei _leave("= %p", inode); 486bec5eb61Swanglei return inode; 487bec5eb61Swanglei 488bec5eb61Swanglei out: 489bec5eb61Swanglei _leave("= %d", ret); 490bec5eb61Swanglei return ERR_PTR(ret); 491bec5eb61Swanglei } 492bec5eb61Swanglei 493bec5eb61Swanglei /* 49408e0e7c8SDavid Howells * look up an entry in a directory 49508e0e7c8SDavid Howells */ 496260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 49700cd8dd3SAl Viro unsigned int flags) 49808e0e7c8SDavid Howells { 49908e0e7c8SDavid Howells struct afs_vnode *vnode; 50008e0e7c8SDavid Howells struct afs_fid fid; 50108e0e7c8SDavid Howells struct inode *inode; 50200d3b7a4SDavid Howells struct key *key; 50308e0e7c8SDavid Howells int ret; 50408e0e7c8SDavid Howells 505260a9803SDavid Howells vnode = AFS_FS_I(dir); 506260a9803SDavid Howells 507a455589fSAl Viro _enter("{%x:%u},%p{%pd},", 508a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, dentry); 509260a9803SDavid Howells 5102b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 51108e0e7c8SDavid Howells 51245222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 51308e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 51408e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 51508e0e7c8SDavid Howells } 51608e0e7c8SDavid Howells 51708e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 51808e0e7c8SDavid Howells _leave(" = -ESTALE"); 51908e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 52008e0e7c8SDavid Howells } 52108e0e7c8SDavid Howells 52200d3b7a4SDavid Howells key = afs_request_key(vnode->volume->cell); 52300d3b7a4SDavid Howells if (IS_ERR(key)) { 52400d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 525e231c2eeSDavid Howells return ERR_CAST(key); 52600d3b7a4SDavid Howells } 52700d3b7a4SDavid Howells 528260a9803SDavid Howells ret = afs_validate(vnode, key); 52908e0e7c8SDavid Howells if (ret < 0) { 53000d3b7a4SDavid Howells key_put(key); 531260a9803SDavid Howells _leave(" = %d [val]", ret); 5321da177e4SLinus Torvalds return ERR_PTR(ret); 5331da177e4SLinus Torvalds } 5341da177e4SLinus Torvalds 535260a9803SDavid Howells ret = afs_do_lookup(dir, dentry, &fid, key); 536260a9803SDavid Howells if (ret < 0) { 537bec5eb61Swanglei inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid); 538bec5eb61Swanglei if (!IS_ERR(inode)) { 539bec5eb61Swanglei key_put(key); 540bec5eb61Swanglei goto success; 541bec5eb61Swanglei } 542bec5eb61Swanglei 543bec5eb61Swanglei ret = PTR_ERR(inode); 544260a9803SDavid Howells key_put(key); 545260a9803SDavid Howells if (ret == -ENOENT) { 546260a9803SDavid Howells d_add(dentry, NULL); 547260a9803SDavid Howells _leave(" = NULL [negative]"); 548260a9803SDavid Howells return NULL; 549260a9803SDavid Howells } 550260a9803SDavid Howells _leave(" = %d [do]", ret); 551260a9803SDavid Howells return ERR_PTR(ret); 552260a9803SDavid Howells } 553260a9803SDavid Howells dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; 554260a9803SDavid Howells 5551da177e4SLinus Torvalds /* instantiate the dentry */ 556260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); 55700d3b7a4SDavid Howells key_put(key); 55808e0e7c8SDavid Howells if (IS_ERR(inode)) { 55908e0e7c8SDavid Howells _leave(" = %ld", PTR_ERR(inode)); 560e231c2eeSDavid Howells return ERR_CAST(inode); 5611da177e4SLinus Torvalds } 5621da177e4SLinus Torvalds 563bec5eb61Swanglei success: 5641da177e4SLinus Torvalds d_add(dentry, inode); 565d6e43f75SDavid Howells _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }", 56608e0e7c8SDavid Howells fid.vnode, 56708e0e7c8SDavid Howells fid.unique, 5682b0143b5SDavid Howells d_inode(dentry)->i_ino, 5692b0143b5SDavid Howells d_inode(dentry)->i_generation); 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds return NULL; 572ec26815aSDavid Howells } 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds /* 5751da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 5761da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 5771da177e4SLinus Torvalds * inode 5781da177e4SLinus Torvalds */ 5790b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 5801da177e4SLinus Torvalds { 581260a9803SDavid Howells struct afs_vnode *vnode, *dir; 582dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 5831da177e4SLinus Torvalds struct dentry *parent; 58400d3b7a4SDavid Howells struct key *key; 585260a9803SDavid Howells void *dir_version; 5861da177e4SLinus Torvalds int ret; 5871da177e4SLinus Torvalds 5880b728e19SAl Viro if (flags & LOOKUP_RCU) 58934286d66SNick Piggin return -ECHILD; 59034286d66SNick Piggin 5912b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 59208e0e7c8SDavid Howells 5932b0143b5SDavid Howells if (d_really_is_positive(dentry)) 594a455589fSAl Viro _enter("{v={%x:%u} n=%pd fl=%lx},", 595a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 596260a9803SDavid Howells vnode->flags); 597260a9803SDavid Howells else 598a455589fSAl Viro _enter("{neg n=%pd}", dentry); 5991da177e4SLinus Torvalds 600260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 60100d3b7a4SDavid Howells if (IS_ERR(key)) 60200d3b7a4SDavid Howells key = NULL; 60300d3b7a4SDavid Howells 6041da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 60508e0e7c8SDavid Howells parent = dget_parent(dentry); 6062b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 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)) { 613a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 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 */ 6282b0143b5SDavid Howells if (d_really_is_negative(dentry)) 629260a9803SDavid Howells goto out_bad; 6302b0143b5SDavid Howells if (is_bad_inode(d_inode(dentry))) { 631a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 632a455589fSAl Viro dentry); 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) { 639a455589fSAl Viro _debug("%pd: dirent changed [%u != %u]", 640a455589fSAl Viro dentry, 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) { 649a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 650a455589fSAl Viro dentry, fid.unique, 6517a224228SJean Noel Cordenner vnode->fid.unique, 6522b0143b5SDavid Howells d_inode(dentry)->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 */ 662a455589fSAl Viro _debug("%pd: dirent not found", dentry); 6632b0143b5SDavid Howells if (d_really_is_positive(dentry)) 664260a9803SDavid Howells goto not_found; 665260a9803SDavid Howells goto out_valid; 666260a9803SDavid Howells 667260a9803SDavid Howells default: 668a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 669a455589fSAl Viro parent, ret); 6701da177e4SLinus Torvalds goto out_bad; 6711da177e4SLinus Torvalds } 67208e0e7c8SDavid Howells 6731da177e4SLinus Torvalds out_valid: 674260a9803SDavid Howells dentry->d_fsdata = dir_version; 6751da177e4SLinus Torvalds dput(parent); 67600d3b7a4SDavid Howells key_put(key); 6771da177e4SLinus Torvalds _leave(" = 1 [valid]"); 6781da177e4SLinus Torvalds return 1; 6791da177e4SLinus Torvalds 6801da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 6811da177e4SLinus Torvalds not_found: 6821da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 6831da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 6841da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds out_bad: 687a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 6881da177e4SLinus Torvalds dput(parent); 68900d3b7a4SDavid Howells key_put(key); 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds _leave(" = 0 [bad]"); 6921da177e4SLinus Torvalds return 0; 693ec26815aSDavid Howells } 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds /* 6961da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 6971da177e4SLinus Torvalds * sleep) 6981da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 6991da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 7001da177e4SLinus Torvalds */ 701fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 7021da177e4SLinus Torvalds { 703a455589fSAl Viro _enter("%pd", dentry); 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 7061da177e4SLinus Torvalds goto zap; 7071da177e4SLinus Torvalds 7082b0143b5SDavid Howells if (d_really_is_positive(dentry) && 7092b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 7102b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 7111da177e4SLinus Torvalds goto zap; 7121da177e4SLinus Torvalds 7131da177e4SLinus Torvalds _leave(" = 0 [keep]"); 7141da177e4SLinus Torvalds return 0; 7151da177e4SLinus Torvalds 7161da177e4SLinus Torvalds zap: 7171da177e4SLinus Torvalds _leave(" = 1 [zap]"); 7181da177e4SLinus Torvalds return 1; 719ec26815aSDavid Howells } 720260a9803SDavid Howells 721260a9803SDavid Howells /* 722260a9803SDavid Howells * handle dentry release 723260a9803SDavid Howells */ 724260a9803SDavid Howells static void afs_d_release(struct dentry *dentry) 725260a9803SDavid Howells { 726a455589fSAl Viro _enter("%pd", dentry); 727260a9803SDavid Howells } 728260a9803SDavid Howells 729260a9803SDavid Howells /* 730260a9803SDavid Howells * create a directory on an AFS filesystem 731260a9803SDavid Howells */ 73218bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 733260a9803SDavid Howells { 734260a9803SDavid Howells struct afs_file_status status; 735260a9803SDavid Howells struct afs_callback cb; 736260a9803SDavid Howells struct afs_server *server; 737260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 738260a9803SDavid Howells struct afs_fid fid; 739260a9803SDavid Howells struct inode *inode; 740260a9803SDavid Howells struct key *key; 741260a9803SDavid Howells int ret; 742260a9803SDavid Howells 743260a9803SDavid Howells dvnode = AFS_FS_I(dir); 744260a9803SDavid Howells 745a455589fSAl Viro _enter("{%x:%u},{%pd},%ho", 746a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 747260a9803SDavid Howells 748260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 749260a9803SDavid Howells if (IS_ERR(key)) { 750260a9803SDavid Howells ret = PTR_ERR(key); 751260a9803SDavid Howells goto error; 752260a9803SDavid Howells } 753260a9803SDavid Howells 754260a9803SDavid Howells mode |= S_IFDIR; 755260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 756260a9803SDavid Howells mode, &fid, &status, &cb, &server); 757260a9803SDavid Howells if (ret < 0) 758260a9803SDavid Howells goto mkdir_error; 759260a9803SDavid Howells 760260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 761260a9803SDavid Howells if (IS_ERR(inode)) { 762260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 763260a9803SDavid Howells * directory on the server */ 764260a9803SDavid Howells ret = PTR_ERR(inode); 765260a9803SDavid Howells goto iget_error; 766260a9803SDavid Howells } 767260a9803SDavid Howells 768260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 769260a9803SDavid Howells vnode = AFS_FS_I(inode); 770260a9803SDavid Howells spin_lock(&vnode->lock); 771260a9803SDavid Howells vnode->update_cnt++; 772260a9803SDavid Howells spin_unlock(&vnode->lock); 773260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 7749ed900b1SDavid Howells afs_put_server(afs_i2net(dir), server); 775260a9803SDavid Howells 776260a9803SDavid Howells d_instantiate(dentry, inode); 777260a9803SDavid Howells if (d_unhashed(dentry)) { 778260a9803SDavid Howells _debug("not hashed"); 779260a9803SDavid Howells d_rehash(dentry); 780260a9803SDavid Howells } 781260a9803SDavid Howells key_put(key); 782260a9803SDavid Howells _leave(" = 0"); 783260a9803SDavid Howells return 0; 784260a9803SDavid Howells 785260a9803SDavid Howells iget_error: 7869ed900b1SDavid Howells afs_put_server(afs_i2net(dir), server); 787260a9803SDavid Howells mkdir_error: 788260a9803SDavid Howells key_put(key); 789260a9803SDavid Howells error: 790260a9803SDavid Howells d_drop(dentry); 791260a9803SDavid Howells _leave(" = %d", ret); 792260a9803SDavid Howells return ret; 793260a9803SDavid Howells } 794260a9803SDavid Howells 795260a9803SDavid Howells /* 796260a9803SDavid Howells * remove a directory from an AFS filesystem 797260a9803SDavid Howells */ 798260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 799260a9803SDavid Howells { 800260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 801260a9803SDavid Howells struct key *key; 802260a9803SDavid Howells int ret; 803260a9803SDavid Howells 804260a9803SDavid Howells dvnode = AFS_FS_I(dir); 805260a9803SDavid Howells 806a455589fSAl Viro _enter("{%x:%u},{%pd}", 807a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 808260a9803SDavid Howells 809260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 810260a9803SDavid Howells if (IS_ERR(key)) { 811260a9803SDavid Howells ret = PTR_ERR(key); 812260a9803SDavid Howells goto error; 813260a9803SDavid Howells } 814260a9803SDavid Howells 815260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); 816260a9803SDavid Howells if (ret < 0) 817260a9803SDavid Howells goto rmdir_error; 818260a9803SDavid Howells 8192b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 8202b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 821260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 822260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 823260a9803SDavid Howells afs_discard_callback_on_delete(vnode); 824260a9803SDavid Howells } 825260a9803SDavid Howells 826260a9803SDavid Howells key_put(key); 827260a9803SDavid Howells _leave(" = 0"); 828260a9803SDavid Howells return 0; 829260a9803SDavid Howells 830260a9803SDavid Howells rmdir_error: 831260a9803SDavid Howells key_put(key); 832260a9803SDavid Howells error: 833260a9803SDavid Howells _leave(" = %d", ret); 834260a9803SDavid Howells return ret; 835260a9803SDavid Howells } 836260a9803SDavid Howells 837260a9803SDavid Howells /* 838260a9803SDavid Howells * remove a file from an AFS filesystem 839260a9803SDavid Howells */ 840260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 841260a9803SDavid Howells { 842260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 843260a9803SDavid Howells struct key *key; 844260a9803SDavid Howells int ret; 845260a9803SDavid Howells 846260a9803SDavid Howells dvnode = AFS_FS_I(dir); 847260a9803SDavid Howells 848a455589fSAl Viro _enter("{%x:%u},{%pd}", 849a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 850260a9803SDavid Howells 851260a9803SDavid Howells ret = -ENAMETOOLONG; 85245222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 853260a9803SDavid Howells goto error; 854260a9803SDavid Howells 855260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 856260a9803SDavid Howells if (IS_ERR(key)) { 857260a9803SDavid Howells ret = PTR_ERR(key); 858260a9803SDavid Howells goto error; 859260a9803SDavid Howells } 860260a9803SDavid Howells 8612b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 8622b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 863260a9803SDavid Howells 864260a9803SDavid Howells /* make sure we have a callback promise on the victim */ 865260a9803SDavid Howells ret = afs_validate(vnode, key); 866260a9803SDavid Howells if (ret < 0) 867260a9803SDavid Howells goto error; 868260a9803SDavid Howells } 869260a9803SDavid Howells 870260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); 871260a9803SDavid Howells if (ret < 0) 872260a9803SDavid Howells goto remove_error; 873260a9803SDavid Howells 8742b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 875260a9803SDavid Howells /* if the file wasn't deleted due to excess hard links, the 876260a9803SDavid Howells * fileserver will break the callback promise on the file - if 877260a9803SDavid Howells * it had one - before it returns to us, and if it was deleted, 878260a9803SDavid Howells * it won't 879260a9803SDavid Howells * 880260a9803SDavid Howells * however, if we didn't have a callback promise outstanding, 881260a9803SDavid Howells * or it was outstanding on a different server, then it won't 882260a9803SDavid Howells * break it either... 883260a9803SDavid Howells */ 8842b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 885260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 886260a9803SDavid Howells _debug("AFS_VNODE_DELETED"); 887260a9803SDavid Howells if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) 888260a9803SDavid Howells _debug("AFS_VNODE_CB_BROKEN"); 889260a9803SDavid Howells set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); 890260a9803SDavid Howells ret = afs_validate(vnode, key); 891260a9803SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 892260a9803SDavid Howells } 893260a9803SDavid Howells 894260a9803SDavid Howells key_put(key); 895260a9803SDavid Howells _leave(" = 0"); 896260a9803SDavid Howells return 0; 897260a9803SDavid Howells 898260a9803SDavid Howells remove_error: 899260a9803SDavid Howells key_put(key); 900260a9803SDavid Howells error: 901260a9803SDavid Howells _leave(" = %d", ret); 902260a9803SDavid Howells return ret; 903260a9803SDavid Howells } 904260a9803SDavid Howells 905260a9803SDavid Howells /* 906260a9803SDavid Howells * create a regular file on an AFS filesystem 907260a9803SDavid Howells */ 9084acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 909ebfc3b49SAl Viro bool excl) 910260a9803SDavid Howells { 911260a9803SDavid Howells struct afs_file_status status; 912260a9803SDavid Howells struct afs_callback cb; 913260a9803SDavid Howells struct afs_server *server; 914260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 915260a9803SDavid Howells struct afs_fid fid; 916260a9803SDavid Howells struct inode *inode; 917260a9803SDavid Howells struct key *key; 918260a9803SDavid Howells int ret; 919260a9803SDavid Howells 920260a9803SDavid Howells dvnode = AFS_FS_I(dir); 921260a9803SDavid Howells 922a455589fSAl Viro _enter("{%x:%u},{%pd},%ho,", 923a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 924260a9803SDavid Howells 925260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 926260a9803SDavid Howells if (IS_ERR(key)) { 927260a9803SDavid Howells ret = PTR_ERR(key); 928260a9803SDavid Howells goto error; 929260a9803SDavid Howells } 930260a9803SDavid Howells 931260a9803SDavid Howells mode |= S_IFREG; 932260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 933260a9803SDavid Howells mode, &fid, &status, &cb, &server); 934260a9803SDavid Howells if (ret < 0) 935260a9803SDavid Howells goto create_error; 936260a9803SDavid Howells 937260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 938260a9803SDavid Howells if (IS_ERR(inode)) { 939260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 940260a9803SDavid Howells * directory on the server */ 941260a9803SDavid Howells ret = PTR_ERR(inode); 942260a9803SDavid Howells goto iget_error; 943260a9803SDavid Howells } 944260a9803SDavid Howells 945260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 946260a9803SDavid Howells vnode = AFS_FS_I(inode); 947260a9803SDavid Howells spin_lock(&vnode->lock); 948260a9803SDavid Howells vnode->update_cnt++; 949260a9803SDavid Howells spin_unlock(&vnode->lock); 950260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 9519ed900b1SDavid Howells afs_put_server(afs_i2net(dir), server); 952260a9803SDavid Howells 953260a9803SDavid Howells d_instantiate(dentry, inode); 954260a9803SDavid Howells if (d_unhashed(dentry)) { 955260a9803SDavid Howells _debug("not hashed"); 956260a9803SDavid Howells d_rehash(dentry); 957260a9803SDavid Howells } 958260a9803SDavid Howells key_put(key); 959260a9803SDavid Howells _leave(" = 0"); 960260a9803SDavid Howells return 0; 961260a9803SDavid Howells 962260a9803SDavid Howells iget_error: 9639ed900b1SDavid Howells afs_put_server(afs_i2net(dir), server); 964260a9803SDavid Howells create_error: 965260a9803SDavid Howells key_put(key); 966260a9803SDavid Howells error: 967260a9803SDavid Howells d_drop(dentry); 968260a9803SDavid Howells _leave(" = %d", ret); 969260a9803SDavid Howells return ret; 970260a9803SDavid Howells } 971260a9803SDavid Howells 972260a9803SDavid Howells /* 973260a9803SDavid Howells * create a hard link between files in an AFS filesystem 974260a9803SDavid Howells */ 975260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 976260a9803SDavid Howells struct dentry *dentry) 977260a9803SDavid Howells { 978260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 979260a9803SDavid Howells struct key *key; 980260a9803SDavid Howells int ret; 981260a9803SDavid Howells 9822b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(from)); 983260a9803SDavid Howells dvnode = AFS_FS_I(dir); 984260a9803SDavid Howells 985a455589fSAl Viro _enter("{%x:%u},{%x:%u},{%pd}", 986260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 987260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 988a455589fSAl Viro dentry); 989260a9803SDavid Howells 990260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 991260a9803SDavid Howells if (IS_ERR(key)) { 992260a9803SDavid Howells ret = PTR_ERR(key); 993260a9803SDavid Howells goto error; 994260a9803SDavid Howells } 995260a9803SDavid Howells 996260a9803SDavid Howells ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); 997260a9803SDavid Howells if (ret < 0) 998260a9803SDavid Howells goto link_error; 999260a9803SDavid Howells 10007de9c6eeSAl Viro ihold(&vnode->vfs_inode); 1001260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1002260a9803SDavid Howells key_put(key); 1003260a9803SDavid Howells _leave(" = 0"); 1004260a9803SDavid Howells return 0; 1005260a9803SDavid Howells 1006260a9803SDavid Howells link_error: 1007260a9803SDavid Howells key_put(key); 1008260a9803SDavid Howells error: 1009260a9803SDavid Howells d_drop(dentry); 1010260a9803SDavid Howells _leave(" = %d", ret); 1011260a9803SDavid Howells return ret; 1012260a9803SDavid Howells } 1013260a9803SDavid Howells 1014260a9803SDavid Howells /* 1015260a9803SDavid Howells * create a symlink in an AFS filesystem 1016260a9803SDavid Howells */ 1017260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1018260a9803SDavid Howells const char *content) 1019260a9803SDavid Howells { 1020260a9803SDavid Howells struct afs_file_status status; 1021260a9803SDavid Howells struct afs_server *server; 1022260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1023260a9803SDavid Howells struct afs_fid fid; 1024260a9803SDavid Howells struct inode *inode; 1025260a9803SDavid Howells struct key *key; 1026260a9803SDavid Howells int ret; 1027260a9803SDavid Howells 1028260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1029260a9803SDavid Howells 1030a455589fSAl Viro _enter("{%x:%u},{%pd},%s", 1031a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1032260a9803SDavid Howells content); 1033260a9803SDavid Howells 1034260a9803SDavid Howells ret = -EINVAL; 103545222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1036260a9803SDavid Howells goto error; 1037260a9803SDavid Howells 1038260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1039260a9803SDavid Howells if (IS_ERR(key)) { 1040260a9803SDavid Howells ret = PTR_ERR(key); 1041260a9803SDavid Howells goto error; 1042260a9803SDavid Howells } 1043260a9803SDavid Howells 1044260a9803SDavid Howells ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, 1045260a9803SDavid Howells &fid, &status, &server); 1046260a9803SDavid Howells if (ret < 0) 1047260a9803SDavid Howells goto create_error; 1048260a9803SDavid Howells 1049260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); 1050260a9803SDavid Howells if (IS_ERR(inode)) { 1051260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 1052260a9803SDavid Howells * directory on the server */ 1053260a9803SDavid Howells ret = PTR_ERR(inode); 1054260a9803SDavid Howells goto iget_error; 1055260a9803SDavid Howells } 1056260a9803SDavid Howells 1057260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 1058260a9803SDavid Howells vnode = AFS_FS_I(inode); 1059260a9803SDavid Howells spin_lock(&vnode->lock); 1060260a9803SDavid Howells vnode->update_cnt++; 1061260a9803SDavid Howells spin_unlock(&vnode->lock); 1062260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 10639ed900b1SDavid Howells afs_put_server(afs_i2net(dir), server); 1064260a9803SDavid Howells 1065260a9803SDavid Howells d_instantiate(dentry, inode); 1066260a9803SDavid Howells if (d_unhashed(dentry)) { 1067260a9803SDavid Howells _debug("not hashed"); 1068260a9803SDavid Howells d_rehash(dentry); 1069260a9803SDavid Howells } 1070260a9803SDavid Howells key_put(key); 1071260a9803SDavid Howells _leave(" = 0"); 1072260a9803SDavid Howells return 0; 1073260a9803SDavid Howells 1074260a9803SDavid Howells iget_error: 10759ed900b1SDavid Howells afs_put_server(afs_i2net(dir), server); 1076260a9803SDavid Howells create_error: 1077260a9803SDavid Howells key_put(key); 1078260a9803SDavid Howells error: 1079260a9803SDavid Howells d_drop(dentry); 1080260a9803SDavid Howells _leave(" = %d", ret); 1081260a9803SDavid Howells return ret; 1082260a9803SDavid Howells } 1083260a9803SDavid Howells 1084260a9803SDavid Howells /* 1085260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1086260a9803SDavid Howells */ 1087260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 10881cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 10891cd66c93SMiklos Szeredi unsigned int flags) 1090260a9803SDavid Howells { 1091260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1092260a9803SDavid Howells struct key *key; 1093260a9803SDavid Howells int ret; 1094260a9803SDavid Howells 10951cd66c93SMiklos Szeredi if (flags) 10961cd66c93SMiklos Szeredi return -EINVAL; 10971cd66c93SMiklos Szeredi 10982b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1099260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1100260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1101260a9803SDavid Howells 1102a455589fSAl Viro _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", 1103260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1104260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1105260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1106a455589fSAl Viro new_dentry); 1107260a9803SDavid Howells 1108260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1109260a9803SDavid Howells if (IS_ERR(key)) { 1110260a9803SDavid Howells ret = PTR_ERR(key); 1111260a9803SDavid Howells goto error; 1112260a9803SDavid Howells } 1113260a9803SDavid Howells 1114260a9803SDavid Howells ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, 1115260a9803SDavid Howells old_dentry->d_name.name, 1116260a9803SDavid Howells new_dentry->d_name.name); 1117260a9803SDavid Howells if (ret < 0) 1118260a9803SDavid Howells goto rename_error; 1119260a9803SDavid Howells key_put(key); 1120260a9803SDavid Howells _leave(" = 0"); 1121260a9803SDavid Howells return 0; 1122260a9803SDavid Howells 1123260a9803SDavid Howells rename_error: 1124260a9803SDavid Howells key_put(key); 1125260a9803SDavid Howells error: 1126260a9803SDavid Howells d_drop(new_dentry); 1127260a9803SDavid Howells _leave(" = %d", ret); 1128260a9803SDavid Howells return ret; 1129260a9803SDavid Howells } 1130