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, 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 */ 394ac7576f4SMiklos Szeredi static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 395ac7576f4SMiklos Szeredi int nlen, loff_t fpos, u64 ino, unsigned dtype) 3961da177e4SLinus Torvalds { 397ac7576f4SMiklos Szeredi struct afs_lookup_cookie *cookie = 398ac7576f4SMiklos Szeredi container_of(ctx, struct afs_lookup_cookie, ctx); 3991da177e4SLinus Torvalds 4001bbae9f8SAl Viro _enter("{%s,%u},%s,%u,,%llu,%u", 4011bbae9f8SAl Viro cookie->name.name, cookie->name.len, name, nlen, 402ba3e0e1aSDavid S. Miller (unsigned long long) ino, dtype); 4031da177e4SLinus Torvalds 40408e0e7c8SDavid Howells /* insanity checks first */ 40508e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 40608e0e7c8SDavid Howells BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 40708e0e7c8SDavid Howells 4081bbae9f8SAl Viro if (cookie->name.len != nlen || 4091bbae9f8SAl Viro memcmp(cookie->name.name, name, nlen) != 0) { 4101da177e4SLinus Torvalds _leave(" = 0 [no]"); 4111da177e4SLinus Torvalds return 0; 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds cookie->fid.vnode = ino; 4151da177e4SLinus Torvalds cookie->fid.unique = dtype; 4161da177e4SLinus Torvalds cookie->found = 1; 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds _leave(" = -1 [found]"); 4191da177e4SLinus Torvalds return -1; 420ec26815aSDavid Howells } 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds /* 42308e0e7c8SDavid Howells * do a lookup in a directory 424260a9803SDavid Howells * - just returns the FID the dentry name maps to if found 4251da177e4SLinus Torvalds */ 42608e0e7c8SDavid Howells static int afs_do_lookup(struct inode *dir, struct dentry *dentry, 42700d3b7a4SDavid Howells struct afs_fid *fid, struct key *key) 4281da177e4SLinus Torvalds { 4291bbae9f8SAl Viro struct afs_super_info *as = dir->i_sb->s_fs_info; 4301bbae9f8SAl Viro struct afs_lookup_cookie cookie = { 4311bbae9f8SAl Viro .ctx.actor = afs_lookup_filldir, 4321bbae9f8SAl Viro .name = dentry->d_name, 4331bbae9f8SAl Viro .fid.vid = as->volume->vid 4341bbae9f8SAl Viro }; 4351da177e4SLinus Torvalds int ret; 4361da177e4SLinus Torvalds 437a455589fSAl Viro _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds /* search the directory */ 4401bbae9f8SAl Viro ret = afs_dir_iterate(dir, &cookie.ctx, key); 4411da177e4SLinus Torvalds if (ret < 0) { 44208e0e7c8SDavid Howells _leave(" = %d [iter]", ret); 44308e0e7c8SDavid Howells return ret; 4441da177e4SLinus Torvalds } 4451da177e4SLinus Torvalds 4461da177e4SLinus Torvalds ret = -ENOENT; 4471da177e4SLinus Torvalds if (!cookie.found) { 44808e0e7c8SDavid Howells _leave(" = -ENOENT [not found]"); 44908e0e7c8SDavid Howells return -ENOENT; 45008e0e7c8SDavid Howells } 45108e0e7c8SDavid Howells 45208e0e7c8SDavid Howells *fid = cookie.fid; 45308e0e7c8SDavid Howells _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); 45408e0e7c8SDavid Howells return 0; 45508e0e7c8SDavid Howells } 45608e0e7c8SDavid Howells 45708e0e7c8SDavid Howells /* 458bec5eb61Swanglei * Try to auto mount the mountpoint with pseudo directory, if the autocell 459bec5eb61Swanglei * operation is setted. 460bec5eb61Swanglei */ 461bec5eb61Swanglei static struct inode *afs_try_auto_mntpt( 462bec5eb61Swanglei int ret, struct dentry *dentry, struct inode *dir, struct key *key, 463bec5eb61Swanglei struct afs_fid *fid) 464bec5eb61Swanglei { 465bec5eb61Swanglei const char *devname = dentry->d_name.name; 466bec5eb61Swanglei struct afs_vnode *vnode = AFS_FS_I(dir); 467bec5eb61Swanglei struct inode *inode; 468bec5eb61Swanglei 469a455589fSAl Viro _enter("%d, %p{%pd}, {%x:%u}, %p", 470a455589fSAl Viro ret, dentry, dentry, vnode->fid.vid, vnode->fid.vnode, key); 471bec5eb61Swanglei 472bec5eb61Swanglei if (ret != -ENOENT || 473bec5eb61Swanglei !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags)) 474bec5eb61Swanglei goto out; 475bec5eb61Swanglei 476bec5eb61Swanglei inode = afs_iget_autocell(dir, devname, strlen(devname), key); 477bec5eb61Swanglei if (IS_ERR(inode)) { 478bec5eb61Swanglei ret = PTR_ERR(inode); 479bec5eb61Swanglei goto out; 480bec5eb61Swanglei } 481bec5eb61Swanglei 482bec5eb61Swanglei *fid = AFS_FS_I(inode)->fid; 483bec5eb61Swanglei _leave("= %p", inode); 484bec5eb61Swanglei return inode; 485bec5eb61Swanglei 486bec5eb61Swanglei out: 487bec5eb61Swanglei _leave("= %d", ret); 488bec5eb61Swanglei return ERR_PTR(ret); 489bec5eb61Swanglei } 490bec5eb61Swanglei 491bec5eb61Swanglei /* 49208e0e7c8SDavid Howells * look up an entry in a directory 49308e0e7c8SDavid Howells */ 494260a9803SDavid Howells static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 49500cd8dd3SAl Viro unsigned int flags) 49608e0e7c8SDavid Howells { 49708e0e7c8SDavid Howells struct afs_vnode *vnode; 49808e0e7c8SDavid Howells struct afs_fid fid; 49908e0e7c8SDavid Howells struct inode *inode; 50000d3b7a4SDavid Howells struct key *key; 50108e0e7c8SDavid Howells int ret; 50208e0e7c8SDavid Howells 503260a9803SDavid Howells vnode = AFS_FS_I(dir); 504260a9803SDavid Howells 505a455589fSAl Viro _enter("{%x:%u},%p{%pd},", 506a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, dentry); 507260a9803SDavid Howells 5082b0143b5SDavid Howells ASSERTCMP(d_inode(dentry), ==, NULL); 50908e0e7c8SDavid Howells 51045222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) { 51108e0e7c8SDavid Howells _leave(" = -ENAMETOOLONG"); 51208e0e7c8SDavid Howells return ERR_PTR(-ENAMETOOLONG); 51308e0e7c8SDavid Howells } 51408e0e7c8SDavid Howells 51508e0e7c8SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 51608e0e7c8SDavid Howells _leave(" = -ESTALE"); 51708e0e7c8SDavid Howells return ERR_PTR(-ESTALE); 51808e0e7c8SDavid Howells } 51908e0e7c8SDavid Howells 52000d3b7a4SDavid Howells key = afs_request_key(vnode->volume->cell); 52100d3b7a4SDavid Howells if (IS_ERR(key)) { 52200d3b7a4SDavid Howells _leave(" = %ld [key]", PTR_ERR(key)); 523e231c2eeSDavid Howells return ERR_CAST(key); 52400d3b7a4SDavid Howells } 52500d3b7a4SDavid Howells 526260a9803SDavid Howells ret = afs_validate(vnode, key); 52708e0e7c8SDavid Howells if (ret < 0) { 52800d3b7a4SDavid Howells key_put(key); 529260a9803SDavid Howells _leave(" = %d [val]", ret); 5301da177e4SLinus Torvalds return ERR_PTR(ret); 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds 533260a9803SDavid Howells ret = afs_do_lookup(dir, dentry, &fid, key); 534260a9803SDavid Howells if (ret < 0) { 535bec5eb61Swanglei inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid); 536bec5eb61Swanglei if (!IS_ERR(inode)) { 537bec5eb61Swanglei key_put(key); 538bec5eb61Swanglei goto success; 539bec5eb61Swanglei } 540bec5eb61Swanglei 541bec5eb61Swanglei ret = PTR_ERR(inode); 542260a9803SDavid Howells key_put(key); 543260a9803SDavid Howells if (ret == -ENOENT) { 544260a9803SDavid Howells d_add(dentry, NULL); 545260a9803SDavid Howells _leave(" = NULL [negative]"); 546260a9803SDavid Howells return NULL; 547260a9803SDavid Howells } 548260a9803SDavid Howells _leave(" = %d [do]", ret); 549260a9803SDavid Howells return ERR_PTR(ret); 550260a9803SDavid Howells } 551260a9803SDavid Howells dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; 552260a9803SDavid Howells 5531da177e4SLinus Torvalds /* instantiate the dentry */ 554260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); 55500d3b7a4SDavid Howells key_put(key); 55608e0e7c8SDavid Howells if (IS_ERR(inode)) { 55708e0e7c8SDavid Howells _leave(" = %ld", PTR_ERR(inode)); 558e231c2eeSDavid Howells return ERR_CAST(inode); 5591da177e4SLinus Torvalds } 5601da177e4SLinus Torvalds 561bec5eb61Swanglei success: 5621da177e4SLinus Torvalds d_add(dentry, inode); 563d6e43f75SDavid Howells _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }", 56408e0e7c8SDavid Howells fid.vnode, 56508e0e7c8SDavid Howells fid.unique, 5662b0143b5SDavid Howells d_inode(dentry)->i_ino, 5672b0143b5SDavid Howells d_inode(dentry)->i_generation); 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds return NULL; 570ec26815aSDavid Howells } 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds /* 5731da177e4SLinus Torvalds * check that a dentry lookup hit has found a valid entry 5741da177e4SLinus Torvalds * - NOTE! the hit can be a negative hit too, so we can't assume we have an 5751da177e4SLinus Torvalds * inode 5761da177e4SLinus Torvalds */ 5770b728e19SAl Viro static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 5781da177e4SLinus Torvalds { 579260a9803SDavid Howells struct afs_vnode *vnode, *dir; 580dd0d9a46SArtem Bityutskiy struct afs_fid uninitialized_var(fid); 5811da177e4SLinus Torvalds struct dentry *parent; 58200d3b7a4SDavid Howells struct key *key; 583260a9803SDavid Howells void *dir_version; 5841da177e4SLinus Torvalds int ret; 5851da177e4SLinus Torvalds 5860b728e19SAl Viro if (flags & LOOKUP_RCU) 58734286d66SNick Piggin return -ECHILD; 58834286d66SNick Piggin 5892b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 59008e0e7c8SDavid Howells 5912b0143b5SDavid Howells if (d_really_is_positive(dentry)) 592a455589fSAl Viro _enter("{v={%x:%u} n=%pd fl=%lx},", 593a455589fSAl Viro vnode->fid.vid, vnode->fid.vnode, dentry, 594260a9803SDavid Howells vnode->flags); 595260a9803SDavid Howells else 596a455589fSAl Viro _enter("{neg n=%pd}", dentry); 5971da177e4SLinus Torvalds 598260a9803SDavid Howells key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 59900d3b7a4SDavid Howells if (IS_ERR(key)) 60000d3b7a4SDavid Howells key = NULL; 60100d3b7a4SDavid Howells 6021da177e4SLinus Torvalds /* lock down the parent dentry so we can peer at it */ 60308e0e7c8SDavid Howells parent = dget_parent(dentry); 6042b0143b5SDavid Howells dir = AFS_FS_I(d_inode(parent)); 6051da177e4SLinus Torvalds 606260a9803SDavid Howells /* validate the parent directory */ 607260a9803SDavid Howells if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) 608260a9803SDavid Howells afs_validate(dir, key); 609260a9803SDavid Howells 610260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 611a455589fSAl Viro _debug("%pd: parent dir deleted", dentry); 6121da177e4SLinus Torvalds goto out_bad; 6131da177e4SLinus Torvalds } 6141da177e4SLinus Torvalds 615260a9803SDavid Howells dir_version = (void *) (unsigned long) dir->status.data_version; 616260a9803SDavid Howells if (dentry->d_fsdata == dir_version) 617260a9803SDavid Howells goto out_valid; /* the dir contents are unchanged */ 618260a9803SDavid Howells 61908e0e7c8SDavid Howells _debug("dir modified"); 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds /* search the directory for this vnode */ 622260a9803SDavid Howells ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); 623260a9803SDavid Howells switch (ret) { 624260a9803SDavid Howells case 0: 625260a9803SDavid Howells /* the filename maps to something */ 6262b0143b5SDavid Howells if (d_really_is_negative(dentry)) 627260a9803SDavid Howells goto out_bad; 6282b0143b5SDavid Howells if (is_bad_inode(d_inode(dentry))) { 629a455589fSAl Viro printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 630a455589fSAl Viro dentry); 6311da177e4SLinus Torvalds goto out_bad; 6321da177e4SLinus Torvalds } 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds /* if the vnode ID has changed, then the dirent points to a 6351da177e4SLinus Torvalds * different file */ 63608e0e7c8SDavid Howells if (fid.vnode != vnode->fid.vnode) { 637a455589fSAl Viro _debug("%pd: dirent changed [%u != %u]", 638a455589fSAl Viro dentry, fid.vnode, 63908e0e7c8SDavid Howells vnode->fid.vnode); 6401da177e4SLinus Torvalds goto not_found; 6411da177e4SLinus Torvalds } 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds /* if the vnode ID uniqifier has changed, then the file has 644260a9803SDavid Howells * been deleted and replaced, and the original vnode ID has 645260a9803SDavid Howells * been reused */ 64608e0e7c8SDavid Howells if (fid.unique != vnode->fid.unique) { 647a455589fSAl Viro _debug("%pd: file deleted (uq %u -> %u I:%u)", 648a455589fSAl Viro dentry, fid.unique, 6497a224228SJean Noel Cordenner vnode->fid.unique, 6502b0143b5SDavid Howells d_inode(dentry)->i_generation); 65108e0e7c8SDavid Howells spin_lock(&vnode->lock); 65208e0e7c8SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 65308e0e7c8SDavid Howells spin_unlock(&vnode->lock); 654260a9803SDavid Howells goto not_found; 655260a9803SDavid Howells } 656260a9803SDavid Howells goto out_valid; 657260a9803SDavid Howells 658260a9803SDavid Howells case -ENOENT: 659260a9803SDavid Howells /* the filename is unknown */ 660a455589fSAl Viro _debug("%pd: dirent not found", dentry); 6612b0143b5SDavid Howells if (d_really_is_positive(dentry)) 662260a9803SDavid Howells goto not_found; 663260a9803SDavid Howells goto out_valid; 664260a9803SDavid Howells 665260a9803SDavid Howells default: 666a455589fSAl Viro _debug("failed to iterate dir %pd: %d", 667a455589fSAl Viro parent, ret); 6681da177e4SLinus Torvalds goto out_bad; 6691da177e4SLinus Torvalds } 67008e0e7c8SDavid Howells 6711da177e4SLinus Torvalds out_valid: 672260a9803SDavid Howells dentry->d_fsdata = dir_version; 6731da177e4SLinus Torvalds dput(parent); 67400d3b7a4SDavid Howells key_put(key); 6751da177e4SLinus Torvalds _leave(" = 1 [valid]"); 6761da177e4SLinus Torvalds return 1; 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds /* the dirent, if it exists, now points to a different vnode */ 6791da177e4SLinus Torvalds not_found: 6801da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 6811da177e4SLinus Torvalds dentry->d_flags |= DCACHE_NFSFS_RENAMED; 6821da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 6831da177e4SLinus Torvalds 6841da177e4SLinus Torvalds out_bad: 685a455589fSAl Viro _debug("dropping dentry %pd2", dentry); 6861da177e4SLinus Torvalds dput(parent); 68700d3b7a4SDavid Howells key_put(key); 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvalds _leave(" = 0 [bad]"); 6901da177e4SLinus Torvalds return 0; 691ec26815aSDavid Howells } 6921da177e4SLinus Torvalds 6931da177e4SLinus Torvalds /* 6941da177e4SLinus Torvalds * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 6951da177e4SLinus Torvalds * sleep) 6961da177e4SLinus Torvalds * - called from dput() when d_count is going to 0. 6971da177e4SLinus Torvalds * - return 1 to request dentry be unhashed, 0 otherwise 6981da177e4SLinus Torvalds */ 699fe15ce44SNick Piggin static int afs_d_delete(const struct dentry *dentry) 7001da177e4SLinus Torvalds { 701a455589fSAl Viro _enter("%pd", dentry); 7021da177e4SLinus Torvalds 7031da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 7041da177e4SLinus Torvalds goto zap; 7051da177e4SLinus Torvalds 7062b0143b5SDavid Howells if (d_really_is_positive(dentry) && 7072b0143b5SDavid Howells (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 7082b0143b5SDavid Howells test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 7091da177e4SLinus Torvalds goto zap; 7101da177e4SLinus Torvalds 7111da177e4SLinus Torvalds _leave(" = 0 [keep]"); 7121da177e4SLinus Torvalds return 0; 7131da177e4SLinus Torvalds 7141da177e4SLinus Torvalds zap: 7151da177e4SLinus Torvalds _leave(" = 1 [zap]"); 7161da177e4SLinus Torvalds return 1; 717ec26815aSDavid Howells } 718260a9803SDavid Howells 719260a9803SDavid Howells /* 720260a9803SDavid Howells * handle dentry release 721260a9803SDavid Howells */ 722260a9803SDavid Howells static void afs_d_release(struct dentry *dentry) 723260a9803SDavid Howells { 724a455589fSAl Viro _enter("%pd", dentry); 725260a9803SDavid Howells } 726260a9803SDavid Howells 727260a9803SDavid Howells /* 728260a9803SDavid Howells * create a directory on an AFS filesystem 729260a9803SDavid Howells */ 73018bb1db3SAl Viro static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 731260a9803SDavid Howells { 732260a9803SDavid Howells struct afs_file_status status; 733260a9803SDavid Howells struct afs_callback cb; 734260a9803SDavid Howells struct afs_server *server; 735260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 736260a9803SDavid Howells struct afs_fid fid; 737260a9803SDavid Howells struct inode *inode; 738260a9803SDavid Howells struct key *key; 739260a9803SDavid Howells int ret; 740260a9803SDavid Howells 741260a9803SDavid Howells dvnode = AFS_FS_I(dir); 742260a9803SDavid Howells 743a455589fSAl Viro _enter("{%x:%u},{%pd},%ho", 744a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 745260a9803SDavid Howells 746260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 747260a9803SDavid Howells if (IS_ERR(key)) { 748260a9803SDavid Howells ret = PTR_ERR(key); 749260a9803SDavid Howells goto error; 750260a9803SDavid Howells } 751260a9803SDavid Howells 752260a9803SDavid Howells mode |= S_IFDIR; 753260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 754260a9803SDavid Howells mode, &fid, &status, &cb, &server); 755260a9803SDavid Howells if (ret < 0) 756260a9803SDavid Howells goto mkdir_error; 757260a9803SDavid Howells 758260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 759260a9803SDavid Howells if (IS_ERR(inode)) { 760260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 761260a9803SDavid Howells * directory on the server */ 762260a9803SDavid Howells ret = PTR_ERR(inode); 763260a9803SDavid Howells goto iget_error; 764260a9803SDavid Howells } 765260a9803SDavid Howells 766260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 767260a9803SDavid Howells vnode = AFS_FS_I(inode); 768260a9803SDavid Howells spin_lock(&vnode->lock); 769260a9803SDavid Howells vnode->update_cnt++; 770260a9803SDavid Howells spin_unlock(&vnode->lock); 771260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 772260a9803SDavid Howells afs_put_server(server); 773260a9803SDavid Howells 774260a9803SDavid Howells d_instantiate(dentry, inode); 775260a9803SDavid Howells if (d_unhashed(dentry)) { 776260a9803SDavid Howells _debug("not hashed"); 777260a9803SDavid Howells d_rehash(dentry); 778260a9803SDavid Howells } 779260a9803SDavid Howells key_put(key); 780260a9803SDavid Howells _leave(" = 0"); 781260a9803SDavid Howells return 0; 782260a9803SDavid Howells 783260a9803SDavid Howells iget_error: 784260a9803SDavid Howells afs_put_server(server); 785260a9803SDavid Howells mkdir_error: 786260a9803SDavid Howells key_put(key); 787260a9803SDavid Howells error: 788260a9803SDavid Howells d_drop(dentry); 789260a9803SDavid Howells _leave(" = %d", ret); 790260a9803SDavid Howells return ret; 791260a9803SDavid Howells } 792260a9803SDavid Howells 793260a9803SDavid Howells /* 794260a9803SDavid Howells * remove a directory from an AFS filesystem 795260a9803SDavid Howells */ 796260a9803SDavid Howells static int afs_rmdir(struct inode *dir, struct dentry *dentry) 797260a9803SDavid Howells { 798260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 799260a9803SDavid Howells struct key *key; 800260a9803SDavid Howells int ret; 801260a9803SDavid Howells 802260a9803SDavid Howells dvnode = AFS_FS_I(dir); 803260a9803SDavid Howells 804a455589fSAl Viro _enter("{%x:%u},{%pd}", 805a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 806260a9803SDavid Howells 807260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 808260a9803SDavid Howells if (IS_ERR(key)) { 809260a9803SDavid Howells ret = PTR_ERR(key); 810260a9803SDavid Howells goto error; 811260a9803SDavid Howells } 812260a9803SDavid Howells 813260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); 814260a9803SDavid Howells if (ret < 0) 815260a9803SDavid Howells goto rmdir_error; 816260a9803SDavid Howells 8172b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 8182b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 819260a9803SDavid Howells clear_nlink(&vnode->vfs_inode); 820260a9803SDavid Howells set_bit(AFS_VNODE_DELETED, &vnode->flags); 821260a9803SDavid Howells afs_discard_callback_on_delete(vnode); 822260a9803SDavid Howells } 823260a9803SDavid Howells 824260a9803SDavid Howells key_put(key); 825260a9803SDavid Howells _leave(" = 0"); 826260a9803SDavid Howells return 0; 827260a9803SDavid Howells 828260a9803SDavid Howells rmdir_error: 829260a9803SDavid Howells key_put(key); 830260a9803SDavid Howells error: 831260a9803SDavid Howells _leave(" = %d", ret); 832260a9803SDavid Howells return ret; 833260a9803SDavid Howells } 834260a9803SDavid Howells 835260a9803SDavid Howells /* 836260a9803SDavid Howells * remove a file from an AFS filesystem 837260a9803SDavid Howells */ 838260a9803SDavid Howells static int afs_unlink(struct inode *dir, struct dentry *dentry) 839260a9803SDavid Howells { 840260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 841260a9803SDavid Howells struct key *key; 842260a9803SDavid Howells int ret; 843260a9803SDavid Howells 844260a9803SDavid Howells dvnode = AFS_FS_I(dir); 845260a9803SDavid Howells 846a455589fSAl Viro _enter("{%x:%u},{%pd}", 847a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry); 848260a9803SDavid Howells 849260a9803SDavid Howells ret = -ENAMETOOLONG; 85045222b9eSDavid Howells if (dentry->d_name.len >= AFSNAMEMAX) 851260a9803SDavid Howells goto error; 852260a9803SDavid Howells 853260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 854260a9803SDavid Howells if (IS_ERR(key)) { 855260a9803SDavid Howells ret = PTR_ERR(key); 856260a9803SDavid Howells goto error; 857260a9803SDavid Howells } 858260a9803SDavid Howells 8592b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 8602b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 861260a9803SDavid Howells 862260a9803SDavid Howells /* make sure we have a callback promise on the victim */ 863260a9803SDavid Howells ret = afs_validate(vnode, key); 864260a9803SDavid Howells if (ret < 0) 865260a9803SDavid Howells goto error; 866260a9803SDavid Howells } 867260a9803SDavid Howells 868260a9803SDavid Howells ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); 869260a9803SDavid Howells if (ret < 0) 870260a9803SDavid Howells goto remove_error; 871260a9803SDavid Howells 8722b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 873260a9803SDavid Howells /* if the file wasn't deleted due to excess hard links, the 874260a9803SDavid Howells * fileserver will break the callback promise on the file - if 875260a9803SDavid Howells * it had one - before it returns to us, and if it was deleted, 876260a9803SDavid Howells * it won't 877260a9803SDavid Howells * 878260a9803SDavid Howells * however, if we didn't have a callback promise outstanding, 879260a9803SDavid Howells * or it was outstanding on a different server, then it won't 880260a9803SDavid Howells * break it either... 881260a9803SDavid Howells */ 8822b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(dentry)); 883260a9803SDavid Howells if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 884260a9803SDavid Howells _debug("AFS_VNODE_DELETED"); 885260a9803SDavid Howells if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) 886260a9803SDavid Howells _debug("AFS_VNODE_CB_BROKEN"); 887260a9803SDavid Howells set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); 888260a9803SDavid Howells ret = afs_validate(vnode, key); 889260a9803SDavid Howells _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 890260a9803SDavid Howells } 891260a9803SDavid Howells 892260a9803SDavid Howells key_put(key); 893260a9803SDavid Howells _leave(" = 0"); 894260a9803SDavid Howells return 0; 895260a9803SDavid Howells 896260a9803SDavid Howells remove_error: 897260a9803SDavid Howells key_put(key); 898260a9803SDavid Howells error: 899260a9803SDavid Howells _leave(" = %d", ret); 900260a9803SDavid Howells return ret; 901260a9803SDavid Howells } 902260a9803SDavid Howells 903260a9803SDavid Howells /* 904260a9803SDavid Howells * create a regular file on an AFS filesystem 905260a9803SDavid Howells */ 9064acdaf27SAl Viro static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 907ebfc3b49SAl Viro bool excl) 908260a9803SDavid Howells { 909260a9803SDavid Howells struct afs_file_status status; 910260a9803SDavid Howells struct afs_callback cb; 911260a9803SDavid Howells struct afs_server *server; 912260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 913260a9803SDavid Howells struct afs_fid fid; 914260a9803SDavid Howells struct inode *inode; 915260a9803SDavid Howells struct key *key; 916260a9803SDavid Howells int ret; 917260a9803SDavid Howells 918260a9803SDavid Howells dvnode = AFS_FS_I(dir); 919260a9803SDavid Howells 920a455589fSAl Viro _enter("{%x:%u},{%pd},%ho,", 921a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 922260a9803SDavid Howells 923260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 924260a9803SDavid Howells if (IS_ERR(key)) { 925260a9803SDavid Howells ret = PTR_ERR(key); 926260a9803SDavid Howells goto error; 927260a9803SDavid Howells } 928260a9803SDavid Howells 929260a9803SDavid Howells mode |= S_IFREG; 930260a9803SDavid Howells ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 931260a9803SDavid Howells mode, &fid, &status, &cb, &server); 932260a9803SDavid Howells if (ret < 0) 933260a9803SDavid Howells goto create_error; 934260a9803SDavid Howells 935260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 936260a9803SDavid Howells if (IS_ERR(inode)) { 937260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 938260a9803SDavid Howells * directory on the server */ 939260a9803SDavid Howells ret = PTR_ERR(inode); 940260a9803SDavid Howells goto iget_error; 941260a9803SDavid Howells } 942260a9803SDavid Howells 943260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 944260a9803SDavid Howells vnode = AFS_FS_I(inode); 945260a9803SDavid Howells spin_lock(&vnode->lock); 946260a9803SDavid Howells vnode->update_cnt++; 947260a9803SDavid Howells spin_unlock(&vnode->lock); 948260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 949260a9803SDavid Howells afs_put_server(server); 950260a9803SDavid Howells 951260a9803SDavid Howells d_instantiate(dentry, inode); 952260a9803SDavid Howells if (d_unhashed(dentry)) { 953260a9803SDavid Howells _debug("not hashed"); 954260a9803SDavid Howells d_rehash(dentry); 955260a9803SDavid Howells } 956260a9803SDavid Howells key_put(key); 957260a9803SDavid Howells _leave(" = 0"); 958260a9803SDavid Howells return 0; 959260a9803SDavid Howells 960260a9803SDavid Howells iget_error: 961260a9803SDavid Howells afs_put_server(server); 962260a9803SDavid Howells create_error: 963260a9803SDavid Howells key_put(key); 964260a9803SDavid Howells error: 965260a9803SDavid Howells d_drop(dentry); 966260a9803SDavid Howells _leave(" = %d", ret); 967260a9803SDavid Howells return ret; 968260a9803SDavid Howells } 969260a9803SDavid Howells 970260a9803SDavid Howells /* 971260a9803SDavid Howells * create a hard link between files in an AFS filesystem 972260a9803SDavid Howells */ 973260a9803SDavid Howells static int afs_link(struct dentry *from, struct inode *dir, 974260a9803SDavid Howells struct dentry *dentry) 975260a9803SDavid Howells { 976260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 977260a9803SDavid Howells struct key *key; 978260a9803SDavid Howells int ret; 979260a9803SDavid Howells 9802b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(from)); 981260a9803SDavid Howells dvnode = AFS_FS_I(dir); 982260a9803SDavid Howells 983a455589fSAl Viro _enter("{%x:%u},{%x:%u},{%pd}", 984260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 985260a9803SDavid Howells dvnode->fid.vid, dvnode->fid.vnode, 986a455589fSAl Viro dentry); 987260a9803SDavid Howells 988260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 989260a9803SDavid Howells if (IS_ERR(key)) { 990260a9803SDavid Howells ret = PTR_ERR(key); 991260a9803SDavid Howells goto error; 992260a9803SDavid Howells } 993260a9803SDavid Howells 994260a9803SDavid Howells ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); 995260a9803SDavid Howells if (ret < 0) 996260a9803SDavid Howells goto link_error; 997260a9803SDavid Howells 9987de9c6eeSAl Viro ihold(&vnode->vfs_inode); 999260a9803SDavid Howells d_instantiate(dentry, &vnode->vfs_inode); 1000260a9803SDavid Howells key_put(key); 1001260a9803SDavid Howells _leave(" = 0"); 1002260a9803SDavid Howells return 0; 1003260a9803SDavid Howells 1004260a9803SDavid Howells link_error: 1005260a9803SDavid Howells key_put(key); 1006260a9803SDavid Howells error: 1007260a9803SDavid Howells d_drop(dentry); 1008260a9803SDavid Howells _leave(" = %d", ret); 1009260a9803SDavid Howells return ret; 1010260a9803SDavid Howells } 1011260a9803SDavid Howells 1012260a9803SDavid Howells /* 1013260a9803SDavid Howells * create a symlink in an AFS filesystem 1014260a9803SDavid Howells */ 1015260a9803SDavid Howells static int afs_symlink(struct inode *dir, struct dentry *dentry, 1016260a9803SDavid Howells const char *content) 1017260a9803SDavid Howells { 1018260a9803SDavid Howells struct afs_file_status status; 1019260a9803SDavid Howells struct afs_server *server; 1020260a9803SDavid Howells struct afs_vnode *dvnode, *vnode; 1021260a9803SDavid Howells struct afs_fid fid; 1022260a9803SDavid Howells struct inode *inode; 1023260a9803SDavid Howells struct key *key; 1024260a9803SDavid Howells int ret; 1025260a9803SDavid Howells 1026260a9803SDavid Howells dvnode = AFS_FS_I(dir); 1027260a9803SDavid Howells 1028a455589fSAl Viro _enter("{%x:%u},{%pd},%s", 1029a455589fSAl Viro dvnode->fid.vid, dvnode->fid.vnode, dentry, 1030260a9803SDavid Howells content); 1031260a9803SDavid Howells 1032260a9803SDavid Howells ret = -EINVAL; 103345222b9eSDavid Howells if (strlen(content) >= AFSPATHMAX) 1034260a9803SDavid Howells goto error; 1035260a9803SDavid Howells 1036260a9803SDavid Howells key = afs_request_key(dvnode->volume->cell); 1037260a9803SDavid Howells if (IS_ERR(key)) { 1038260a9803SDavid Howells ret = PTR_ERR(key); 1039260a9803SDavid Howells goto error; 1040260a9803SDavid Howells } 1041260a9803SDavid Howells 1042260a9803SDavid Howells ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, 1043260a9803SDavid Howells &fid, &status, &server); 1044260a9803SDavid Howells if (ret < 0) 1045260a9803SDavid Howells goto create_error; 1046260a9803SDavid Howells 1047260a9803SDavid Howells inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); 1048260a9803SDavid Howells if (IS_ERR(inode)) { 1049260a9803SDavid Howells /* ENOMEM at a really inconvenient time - just abandon the new 1050260a9803SDavid Howells * directory on the server */ 1051260a9803SDavid Howells ret = PTR_ERR(inode); 1052260a9803SDavid Howells goto iget_error; 1053260a9803SDavid Howells } 1054260a9803SDavid Howells 1055260a9803SDavid Howells /* apply the status report we've got for the new vnode */ 1056260a9803SDavid Howells vnode = AFS_FS_I(inode); 1057260a9803SDavid Howells spin_lock(&vnode->lock); 1058260a9803SDavid Howells vnode->update_cnt++; 1059260a9803SDavid Howells spin_unlock(&vnode->lock); 1060260a9803SDavid Howells afs_vnode_finalise_status_update(vnode, server); 1061260a9803SDavid Howells afs_put_server(server); 1062260a9803SDavid Howells 1063260a9803SDavid Howells d_instantiate(dentry, inode); 1064260a9803SDavid Howells if (d_unhashed(dentry)) { 1065260a9803SDavid Howells _debug("not hashed"); 1066260a9803SDavid Howells d_rehash(dentry); 1067260a9803SDavid Howells } 1068260a9803SDavid Howells key_put(key); 1069260a9803SDavid Howells _leave(" = 0"); 1070260a9803SDavid Howells return 0; 1071260a9803SDavid Howells 1072260a9803SDavid Howells iget_error: 1073260a9803SDavid Howells afs_put_server(server); 1074260a9803SDavid Howells create_error: 1075260a9803SDavid Howells key_put(key); 1076260a9803SDavid Howells error: 1077260a9803SDavid Howells d_drop(dentry); 1078260a9803SDavid Howells _leave(" = %d", ret); 1079260a9803SDavid Howells return ret; 1080260a9803SDavid Howells } 1081260a9803SDavid Howells 1082260a9803SDavid Howells /* 1083260a9803SDavid Howells * rename a file in an AFS filesystem and/or move it between directories 1084260a9803SDavid Howells */ 1085260a9803SDavid Howells static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 1086260a9803SDavid Howells struct inode *new_dir, struct dentry *new_dentry) 1087260a9803SDavid Howells { 1088260a9803SDavid Howells struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1089260a9803SDavid Howells struct key *key; 1090260a9803SDavid Howells int ret; 1091260a9803SDavid Howells 10922b0143b5SDavid Howells vnode = AFS_FS_I(d_inode(old_dentry)); 1093260a9803SDavid Howells orig_dvnode = AFS_FS_I(old_dir); 1094260a9803SDavid Howells new_dvnode = AFS_FS_I(new_dir); 1095260a9803SDavid Howells 1096a455589fSAl Viro _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", 1097260a9803SDavid Howells orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1098260a9803SDavid Howells vnode->fid.vid, vnode->fid.vnode, 1099260a9803SDavid Howells new_dvnode->fid.vid, new_dvnode->fid.vnode, 1100a455589fSAl Viro new_dentry); 1101260a9803SDavid Howells 1102260a9803SDavid Howells key = afs_request_key(orig_dvnode->volume->cell); 1103260a9803SDavid Howells if (IS_ERR(key)) { 1104260a9803SDavid Howells ret = PTR_ERR(key); 1105260a9803SDavid Howells goto error; 1106260a9803SDavid Howells } 1107260a9803SDavid Howells 1108260a9803SDavid Howells ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, 1109260a9803SDavid Howells old_dentry->d_name.name, 1110260a9803SDavid Howells new_dentry->d_name.name); 1111260a9803SDavid Howells if (ret < 0) 1112260a9803SDavid Howells goto rename_error; 1113260a9803SDavid Howells key_put(key); 1114260a9803SDavid Howells _leave(" = 0"); 1115260a9803SDavid Howells return 0; 1116260a9803SDavid Howells 1117260a9803SDavid Howells rename_error: 1118260a9803SDavid Howells key_put(key); 1119260a9803SDavid Howells error: 1120260a9803SDavid Howells d_drop(new_dentry); 1121260a9803SDavid Howells _leave(" = %d", ret); 1122260a9803SDavid Howells return ret; 1123260a9803SDavid Howells } 1124