1457c8996SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * linux/fs/nfs/dir.c 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Copyright (C) 1992 Rick Sladkey 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * nfs directory handling functions 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * 10 Apr 1996 Added silly rename for unlink --okir 101da177e4SLinus Torvalds * 28 Sep 1996 Improved directory cache --okir 111da177e4SLinus Torvalds * 23 Aug 1997 Claus Heine claus@momo.math.rwth-aachen.de 121da177e4SLinus Torvalds * Re-implemented silly rename for unlink, newly implemented 131da177e4SLinus Torvalds * silly rename for nfs_rename() following the suggestions 141da177e4SLinus Torvalds * of Olaf Kirch (okir) found in this file. 151da177e4SLinus Torvalds * Following Linus comments on my original hack, this version 161da177e4SLinus Torvalds * depends only on the dcache stuff and doesn't touch the inode 171da177e4SLinus Torvalds * layer (iput() and friends). 181da177e4SLinus Torvalds * 6 Jun 1999 Cache readdir lookups in the page cache. -DaveM 191da177e4SLinus Torvalds */ 201da177e4SLinus Torvalds 21ddda8e0aSBryan Schumaker #include <linux/module.h> 221da177e4SLinus Torvalds #include <linux/time.h> 231da177e4SLinus Torvalds #include <linux/errno.h> 241da177e4SLinus Torvalds #include <linux/stat.h> 251da177e4SLinus Torvalds #include <linux/fcntl.h> 261da177e4SLinus Torvalds #include <linux/string.h> 271da177e4SLinus Torvalds #include <linux/kernel.h> 281da177e4SLinus Torvalds #include <linux/slab.h> 291da177e4SLinus Torvalds #include <linux/mm.h> 301da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 311da177e4SLinus Torvalds #include <linux/nfs_fs.h> 321da177e4SLinus Torvalds #include <linux/nfs_mount.h> 331da177e4SLinus Torvalds #include <linux/pagemap.h> 34873101b3SChuck Lever #include <linux/pagevec.h> 351da177e4SLinus Torvalds #include <linux/namei.h> 3654ceac45SDavid Howells #include <linux/mount.h> 37a0b8cab3SMel Gorman #include <linux/swap.h> 38e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 3904e4bd1cSCatalin Marinas #include <linux/kmemleak.h> 4064c2ce8bSAneesh Kumar K.V #include <linux/xattr.h> 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds #include "delegation.h" 4391d5b470SChuck Lever #include "iostat.h" 444c30d56eSAdrian Bunk #include "internal.h" 45cd9a1c0eSTrond Myklebust #include "fscache.h" 461da177e4SLinus Torvalds 47f4ce1299STrond Myklebust #include "nfstrace.h" 48f4ce1299STrond Myklebust 491da177e4SLinus Torvalds /* #define NFS_DEBUG_VERBOSE 1 */ 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds static int nfs_opendir(struct inode *, struct file *); 52480c2006SBryan Schumaker static int nfs_closedir(struct inode *, struct file *); 5323db8620SAl Viro static int nfs_readdir(struct file *, struct dir_context *); 5402c24a82SJosef Bacik static int nfs_fsync_dir(struct file *, loff_t, loff_t, int); 55f0dd2136STrond Myklebust static loff_t nfs_llseek_dir(struct file *, loff_t, int); 5611de3b11STrond Myklebust static void nfs_readdir_clear_array(struct page*); 571da177e4SLinus Torvalds 584b6f5d20SArjan van de Ven const struct file_operations nfs_dir_operations = { 59f0dd2136STrond Myklebust .llseek = nfs_llseek_dir, 601da177e4SLinus Torvalds .read = generic_read_dir, 61b044f645SBenjamin Coddington .iterate = nfs_readdir, 621da177e4SLinus Torvalds .open = nfs_opendir, 63480c2006SBryan Schumaker .release = nfs_closedir, 641da177e4SLinus Torvalds .fsync = nfs_fsync_dir, 651da177e4SLinus Torvalds }; 661da177e4SLinus Torvalds 6711de3b11STrond Myklebust const struct address_space_operations nfs_dir_aops = { 6811de3b11STrond Myklebust .freepage = nfs_readdir_clear_array, 69d1bacf9eSBryan Schumaker }; 70d1bacf9eSBryan Schumaker 71684f39b4SNeilBrown static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir, const struct cred *cred) 72480c2006SBryan Schumaker { 73311324adSTrond Myklebust struct nfs_inode *nfsi = NFS_I(dir); 74480c2006SBryan Schumaker struct nfs_open_dir_context *ctx; 75480c2006SBryan Schumaker ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 76480c2006SBryan Schumaker if (ctx != NULL) { 778ef2ce3eSBryan Schumaker ctx->duped = 0; 78311324adSTrond Myklebust ctx->attr_gencount = nfsi->attr_gencount; 79480c2006SBryan Schumaker ctx->dir_cookie = 0; 808ef2ce3eSBryan Schumaker ctx->dup_cookie = 0; 81684f39b4SNeilBrown ctx->cred = get_cred(cred); 82311324adSTrond Myklebust spin_lock(&dir->i_lock); 83311324adSTrond Myklebust list_add(&ctx->list, &nfsi->open_files); 84311324adSTrond Myklebust spin_unlock(&dir->i_lock); 85480c2006SBryan Schumaker return ctx; 86480c2006SBryan Schumaker } 870c030806STrond Myklebust return ERR_PTR(-ENOMEM); 880c030806STrond Myklebust } 89480c2006SBryan Schumaker 90311324adSTrond Myklebust static void put_nfs_open_dir_context(struct inode *dir, struct nfs_open_dir_context *ctx) 91480c2006SBryan Schumaker { 92311324adSTrond Myklebust spin_lock(&dir->i_lock); 93311324adSTrond Myklebust list_del(&ctx->list); 94311324adSTrond Myklebust spin_unlock(&dir->i_lock); 95684f39b4SNeilBrown put_cred(ctx->cred); 96480c2006SBryan Schumaker kfree(ctx); 97480c2006SBryan Schumaker } 98480c2006SBryan Schumaker 991da177e4SLinus Torvalds /* 1001da177e4SLinus Torvalds * Open file 1011da177e4SLinus Torvalds */ 1021da177e4SLinus Torvalds static int 1031da177e4SLinus Torvalds nfs_opendir(struct inode *inode, struct file *filp) 1041da177e4SLinus Torvalds { 105480c2006SBryan Schumaker int res = 0; 106480c2006SBryan Schumaker struct nfs_open_dir_context *ctx; 1071da177e4SLinus Torvalds 1086de1472fSAl Viro dfprintk(FILE, "NFS: open dir(%pD2)\n", filp); 109cc0dd2d1SChuck Lever 110cc0dd2d1SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSOPEN); 1111e7cb3dcSChuck Lever 112684f39b4SNeilBrown ctx = alloc_nfs_open_dir_context(inode, current_cred()); 113480c2006SBryan Schumaker if (IS_ERR(ctx)) { 114480c2006SBryan Schumaker res = PTR_ERR(ctx); 115480c2006SBryan Schumaker goto out; 116480c2006SBryan Schumaker } 117480c2006SBryan Schumaker filp->private_data = ctx; 118480c2006SBryan Schumaker out: 1191da177e4SLinus Torvalds return res; 1201da177e4SLinus Torvalds } 1211da177e4SLinus Torvalds 122480c2006SBryan Schumaker static int 123480c2006SBryan Schumaker nfs_closedir(struct inode *inode, struct file *filp) 124480c2006SBryan Schumaker { 125a455589fSAl Viro put_nfs_open_dir_context(file_inode(filp), filp->private_data); 126480c2006SBryan Schumaker return 0; 127480c2006SBryan Schumaker } 128480c2006SBryan Schumaker 129d1bacf9eSBryan Schumaker struct nfs_cache_array_entry { 130d1bacf9eSBryan Schumaker u64 cookie; 131d1bacf9eSBryan Schumaker u64 ino; 132d1bacf9eSBryan Schumaker struct qstr string; 1330b26a0bfSTrond Myklebust unsigned char d_type; 134d1bacf9eSBryan Schumaker }; 135d1bacf9eSBryan Schumaker 136d1bacf9eSBryan Schumaker struct nfs_cache_array { 13788b8e133SChuck Lever int size; 138d1bacf9eSBryan Schumaker int eof_index; 139d1bacf9eSBryan Schumaker u64 last_cookie; 140d1bacf9eSBryan Schumaker struct nfs_cache_array_entry array[0]; 141d1bacf9eSBryan Schumaker }; 142d1bacf9eSBryan Schumaker 143be4c2d47Sluanshi struct readdirvec { 144be4c2d47Sluanshi unsigned long nr; 145be4c2d47Sluanshi unsigned long index; 146be4c2d47Sluanshi struct page *pages[NFS_MAX_READDIR_RAPAGES]; 147be4c2d47Sluanshi }; 148be4c2d47Sluanshi 149a7a3b1e9SBenjamin Coddington typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, bool); 1501da177e4SLinus Torvalds typedef struct { 1511da177e4SLinus Torvalds struct file *file; 1521da177e4SLinus Torvalds struct page *page; 15323db8620SAl Viro struct dir_context *ctx; 1541da177e4SLinus Torvalds unsigned long page_index; 155be4c2d47Sluanshi struct readdirvec pvec; 156f0dd2136STrond Myklebust u64 *dir_cookie; 1570aded708STrond Myklebust u64 last_cookie; 158f0dd2136STrond Myklebust loff_t current_index; 1591da177e4SLinus Torvalds decode_dirent_t decode; 160d1bacf9eSBryan Schumaker 1611f4eab7eSNeil Brown unsigned long timestamp; 1624704f0e2STrond Myklebust unsigned long gencount; 163d1bacf9eSBryan Schumaker unsigned int cache_entry_index; 164a7a3b1e9SBenjamin Coddington bool plus; 165a7a3b1e9SBenjamin Coddington bool eof; 1661da177e4SLinus Torvalds } nfs_readdir_descriptor_t; 1671da177e4SLinus Torvalds 168d1bacf9eSBryan Schumaker /* 169d1bacf9eSBryan Schumaker * we are freeing strings created by nfs_add_to_readdir_array() 170d1bacf9eSBryan Schumaker */ 171d1bacf9eSBryan Schumaker static 17211de3b11STrond Myklebust void nfs_readdir_clear_array(struct page *page) 173d1bacf9eSBryan Schumaker { 17411de3b11STrond Myklebust struct nfs_cache_array *array; 175d1bacf9eSBryan Schumaker int i; 1768cd51a0cSTrond Myklebust 1772b86ce2dSCong Wang array = kmap_atomic(page); 178d1bacf9eSBryan Schumaker for (i = 0; i < array->size; i++) 179d1bacf9eSBryan Schumaker kfree(array->array[i].string.name); 1802b86ce2dSCong Wang kunmap_atomic(array); 181d1bacf9eSBryan Schumaker } 182d1bacf9eSBryan Schumaker 183d1bacf9eSBryan Schumaker /* 184d1bacf9eSBryan Schumaker * the caller is responsible for freeing qstr.name 185d1bacf9eSBryan Schumaker * when called by nfs_readdir_add_to_array, the strings will be freed in 186d1bacf9eSBryan Schumaker * nfs_clear_readdir_array() 187d1bacf9eSBryan Schumaker */ 188d1bacf9eSBryan Schumaker static 1894a201d6eSTrond Myklebust int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len) 190d1bacf9eSBryan Schumaker { 191d1bacf9eSBryan Schumaker string->len = len; 192d1bacf9eSBryan Schumaker string->name = kmemdup(name, len, GFP_KERNEL); 1934a201d6eSTrond Myklebust if (string->name == NULL) 1944a201d6eSTrond Myklebust return -ENOMEM; 19504e4bd1cSCatalin Marinas /* 19604e4bd1cSCatalin Marinas * Avoid a kmemleak false positive. The pointer to the name is stored 19704e4bd1cSCatalin Marinas * in a page cache page which kmemleak does not scan. 19804e4bd1cSCatalin Marinas */ 19904e4bd1cSCatalin Marinas kmemleak_not_leak(string->name); 2008387ff25SLinus Torvalds string->hash = full_name_hash(NULL, name, len); 2014a201d6eSTrond Myklebust return 0; 202d1bacf9eSBryan Schumaker } 203d1bacf9eSBryan Schumaker 204d1bacf9eSBryan Schumaker static 205d1bacf9eSBryan Schumaker int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) 206d1bacf9eSBryan Schumaker { 2070795bf83SFabian Frederick struct nfs_cache_array *array = kmap(page); 2084a201d6eSTrond Myklebust struct nfs_cache_array_entry *cache_entry; 2094a201d6eSTrond Myklebust int ret; 2104a201d6eSTrond Myklebust 2114a201d6eSTrond Myklebust cache_entry = &array->array[array->size]; 2123020093fSTrond Myklebust 2133020093fSTrond Myklebust /* Check that this entry lies within the page bounds */ 2143020093fSTrond Myklebust ret = -ENOSPC; 2153020093fSTrond Myklebust if ((char *)&cache_entry[1] - (char *)page_address(page) > PAGE_SIZE) 2163020093fSTrond Myklebust goto out; 2173020093fSTrond Myklebust 2184a201d6eSTrond Myklebust cache_entry->cookie = entry->prev_cookie; 2194a201d6eSTrond Myklebust cache_entry->ino = entry->ino; 2200b26a0bfSTrond Myklebust cache_entry->d_type = entry->d_type; 2214a201d6eSTrond Myklebust ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len); 2224a201d6eSTrond Myklebust if (ret) 2234a201d6eSTrond Myklebust goto out; 224d1bacf9eSBryan Schumaker array->last_cookie = entry->cookie; 2258cd51a0cSTrond Myklebust array->size++; 22647c716cbSTrond Myklebust if (entry->eof != 0) 227d1bacf9eSBryan Schumaker array->eof_index = array->size; 2284a201d6eSTrond Myklebust out: 2290795bf83SFabian Frederick kunmap(page); 2304a201d6eSTrond Myklebust return ret; 231d1bacf9eSBryan Schumaker } 232d1bacf9eSBryan Schumaker 233d1bacf9eSBryan Schumaker static 234d1bacf9eSBryan Schumaker int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) 235d1bacf9eSBryan Schumaker { 23623db8620SAl Viro loff_t diff = desc->ctx->pos - desc->current_index; 237d1bacf9eSBryan Schumaker unsigned int index; 238d1bacf9eSBryan Schumaker 239d1bacf9eSBryan Schumaker if (diff < 0) 240d1bacf9eSBryan Schumaker goto out_eof; 241d1bacf9eSBryan Schumaker if (diff >= array->size) { 2428cd51a0cSTrond Myklebust if (array->eof_index >= 0) 243d1bacf9eSBryan Schumaker goto out_eof; 244d1bacf9eSBryan Schumaker return -EAGAIN; 245d1bacf9eSBryan Schumaker } 246d1bacf9eSBryan Schumaker 247d1bacf9eSBryan Schumaker index = (unsigned int)diff; 248d1bacf9eSBryan Schumaker *desc->dir_cookie = array->array[index].cookie; 249d1bacf9eSBryan Schumaker desc->cache_entry_index = index; 250d1bacf9eSBryan Schumaker return 0; 251d1bacf9eSBryan Schumaker out_eof: 2526089dd0dSThomas Meyer desc->eof = true; 253d1bacf9eSBryan Schumaker return -EBADCOOKIE; 254d1bacf9eSBryan Schumaker } 255d1bacf9eSBryan Schumaker 2564db72b40SJeff Layton static bool 2574db72b40SJeff Layton nfs_readdir_inode_mapping_valid(struct nfs_inode *nfsi) 2584db72b40SJeff Layton { 2594db72b40SJeff Layton if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA)) 2604db72b40SJeff Layton return false; 2614db72b40SJeff Layton smp_rmb(); 2624db72b40SJeff Layton return !test_bit(NFS_INO_INVALIDATING, &nfsi->flags); 2634db72b40SJeff Layton } 2644db72b40SJeff Layton 265d1bacf9eSBryan Schumaker static 266d1bacf9eSBryan Schumaker int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) 267d1bacf9eSBryan Schumaker { 268d1bacf9eSBryan Schumaker int i; 2698ef2ce3eSBryan Schumaker loff_t new_pos; 270d1bacf9eSBryan Schumaker int status = -EAGAIN; 271d1bacf9eSBryan Schumaker 272d1bacf9eSBryan Schumaker for (i = 0; i < array->size; i++) { 2738cd51a0cSTrond Myklebust if (array->array[i].cookie == *desc->dir_cookie) { 274496ad9aaSAl Viro struct nfs_inode *nfsi = NFS_I(file_inode(desc->file)); 2750c030806STrond Myklebust struct nfs_open_dir_context *ctx = desc->file->private_data; 2760c030806STrond Myklebust 2778ef2ce3eSBryan Schumaker new_pos = desc->current_index + i; 2784db72b40SJeff Layton if (ctx->attr_gencount != nfsi->attr_gencount || 2794db72b40SJeff Layton !nfs_readdir_inode_mapping_valid(nfsi)) { 2800c030806STrond Myklebust ctx->duped = 0; 2810c030806STrond Myklebust ctx->attr_gencount = nfsi->attr_gencount; 28223db8620SAl Viro } else if (new_pos < desc->ctx->pos) { 2830c030806STrond Myklebust if (ctx->duped > 0 2840c030806STrond Myklebust && ctx->dup_cookie == *desc->dir_cookie) { 2850c030806STrond Myklebust if (printk_ratelimit()) { 2866de1472fSAl Viro pr_notice("NFS: directory %pD2 contains a readdir loop." 2870c030806STrond Myklebust "Please contact your server vendor. " 2889581a4aeSJeff Layton "The file: %.*s has duplicate cookie %llu\n", 2899581a4aeSJeff Layton desc->file, array->array[i].string.len, 2909581a4aeSJeff Layton array->array[i].string.name, *desc->dir_cookie); 2910c030806STrond Myklebust } 2920c030806STrond Myklebust status = -ELOOP; 2930c030806STrond Myklebust goto out; 2940c030806STrond Myklebust } 2958ef2ce3eSBryan Schumaker ctx->dup_cookie = *desc->dir_cookie; 2960c030806STrond Myklebust ctx->duped = -1; 2978ef2ce3eSBryan Schumaker } 29823db8620SAl Viro desc->ctx->pos = new_pos; 2998cd51a0cSTrond Myklebust desc->cache_entry_index = i; 30047c716cbSTrond Myklebust return 0; 3018cd51a0cSTrond Myklebust } 3028cd51a0cSTrond Myklebust } 30347c716cbSTrond Myklebust if (array->eof_index >= 0) { 304d1bacf9eSBryan Schumaker status = -EBADCOOKIE; 30518fb5fe4STrond Myklebust if (*desc->dir_cookie == array->last_cookie) 3066089dd0dSThomas Meyer desc->eof = true; 307d1bacf9eSBryan Schumaker } 3080c030806STrond Myklebust out: 309d1bacf9eSBryan Schumaker return status; 310d1bacf9eSBryan Schumaker } 311d1bacf9eSBryan Schumaker 312d1bacf9eSBryan Schumaker static 313d1bacf9eSBryan Schumaker int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) 314d1bacf9eSBryan Schumaker { 315d1bacf9eSBryan Schumaker struct nfs_cache_array *array; 31647c716cbSTrond Myklebust int status; 317d1bacf9eSBryan Schumaker 3180795bf83SFabian Frederick array = kmap(desc->page); 319d1bacf9eSBryan Schumaker 320d1bacf9eSBryan Schumaker if (*desc->dir_cookie == 0) 321d1bacf9eSBryan Schumaker status = nfs_readdir_search_for_pos(array, desc); 322d1bacf9eSBryan Schumaker else 323d1bacf9eSBryan Schumaker status = nfs_readdir_search_for_cookie(array, desc); 324d1bacf9eSBryan Schumaker 32547c716cbSTrond Myklebust if (status == -EAGAIN) { 3260aded708STrond Myklebust desc->last_cookie = array->last_cookie; 327e47c085aSTrond Myklebust desc->current_index += array->size; 32847c716cbSTrond Myklebust desc->page_index++; 32947c716cbSTrond Myklebust } 3300795bf83SFabian Frederick kunmap(desc->page); 331d1bacf9eSBryan Schumaker return status; 332d1bacf9eSBryan Schumaker } 333d1bacf9eSBryan Schumaker 334d1bacf9eSBryan Schumaker /* Fill a page with xdr information before transferring to the cache page */ 335d1bacf9eSBryan Schumaker static 33656e4ebf8SBryan Schumaker int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, 337d1bacf9eSBryan Schumaker struct nfs_entry *entry, struct file *file, struct inode *inode) 338d1bacf9eSBryan Schumaker { 339480c2006SBryan Schumaker struct nfs_open_dir_context *ctx = file->private_data; 340684f39b4SNeilBrown const struct cred *cred = ctx->cred; 3414704f0e2STrond Myklebust unsigned long timestamp, gencount; 3421da177e4SLinus Torvalds int error; 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds again: 3451da177e4SLinus Torvalds timestamp = jiffies; 3464704f0e2STrond Myklebust gencount = nfs_inc_attr_generation_counter(); 347be62a1a8SMiklos Szeredi error = NFS_PROTO(inode)->readdir(file_dentry(file), cred, entry->cookie, pages, 3481da177e4SLinus Torvalds NFS_SERVER(inode)->dtsize, desc->plus); 3491da177e4SLinus Torvalds if (error < 0) { 3501da177e4SLinus Torvalds /* We requested READDIRPLUS, but the server doesn't grok it */ 3511da177e4SLinus Torvalds if (error == -ENOTSUPP && desc->plus) { 3521da177e4SLinus Torvalds NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; 3533a10c30aSBenny Halevy clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); 354a7a3b1e9SBenjamin Coddington desc->plus = false; 3551da177e4SLinus Torvalds goto again; 3561da177e4SLinus Torvalds } 3571da177e4SLinus Torvalds goto error; 3581da177e4SLinus Torvalds } 3591f4eab7eSNeil Brown desc->timestamp = timestamp; 3604704f0e2STrond Myklebust desc->gencount = gencount; 361d1bacf9eSBryan Schumaker error: 362d1bacf9eSBryan Schumaker return error; 363d1bacf9eSBryan Schumaker } 364d1bacf9eSBryan Schumaker 365573c4e1eSChuck Lever static int xdr_decode(nfs_readdir_descriptor_t *desc, 366573c4e1eSChuck Lever struct nfs_entry *entry, struct xdr_stream *xdr) 367d1bacf9eSBryan Schumaker { 368573c4e1eSChuck Lever int error; 369d1bacf9eSBryan Schumaker 370573c4e1eSChuck Lever error = desc->decode(xdr, entry, desc->plus); 371573c4e1eSChuck Lever if (error) 372573c4e1eSChuck Lever return error; 373d1bacf9eSBryan Schumaker entry->fattr->time_start = desc->timestamp; 374d1bacf9eSBryan Schumaker entry->fattr->gencount = desc->gencount; 375d1bacf9eSBryan Schumaker return 0; 376d1bacf9eSBryan Schumaker } 377d1bacf9eSBryan Schumaker 378fa923369STrond Myklebust /* Match file and dirent using either filehandle or fileid 379fa923369STrond Myklebust * Note: caller is responsible for checking the fsid 380fa923369STrond Myklebust */ 381d39ab9deSBryan Schumaker static 382d39ab9deSBryan Schumaker int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) 383d39ab9deSBryan Schumaker { 384d8fdb47fSTrond Myklebust struct inode *inode; 385fa923369STrond Myklebust struct nfs_inode *nfsi; 386fa923369STrond Myklebust 3872b0143b5SDavid Howells if (d_really_is_negative(dentry)) 3882b0143b5SDavid Howells return 0; 389fa923369STrond Myklebust 390d8fdb47fSTrond Myklebust inode = d_inode(dentry); 391d8fdb47fSTrond Myklebust if (is_bad_inode(inode) || NFS_STALE(inode)) 392d8fdb47fSTrond Myklebust return 0; 393d8fdb47fSTrond Myklebust 394d8fdb47fSTrond Myklebust nfsi = NFS_I(inode); 3957dc72d5fSTrond Myklebust if (entry->fattr->fileid != nfsi->fileid) 396d39ab9deSBryan Schumaker return 0; 3977dc72d5fSTrond Myklebust if (entry->fh->size && nfs_compare_fh(entry->fh, &nfsi->fh) != 0) 3987dc72d5fSTrond Myklebust return 0; 3997dc72d5fSTrond Myklebust return 1; 400d39ab9deSBryan Schumaker } 401d39ab9deSBryan Schumaker 402d39ab9deSBryan Schumaker static 40323db8620SAl Viro bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx) 404d69ee9b8STrond Myklebust { 405d69ee9b8STrond Myklebust if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) 406d69ee9b8STrond Myklebust return false; 407d69ee9b8STrond Myklebust if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) 408d69ee9b8STrond Myklebust return true; 40923db8620SAl Viro if (ctx->pos == 0) 410d69ee9b8STrond Myklebust return true; 411d69ee9b8STrond Myklebust return false; 412d69ee9b8STrond Myklebust } 413d69ee9b8STrond Myklebust 414d69ee9b8STrond Myklebust /* 41563519fbcSTrond Myklebust * This function is called by the lookup and getattr code to request the 41663519fbcSTrond Myklebust * use of readdirplus to accelerate any future lookups in the same 417d69ee9b8STrond Myklebust * directory. 418d69ee9b8STrond Myklebust */ 419d69ee9b8STrond Myklebust void nfs_advise_use_readdirplus(struct inode *dir) 420d69ee9b8STrond Myklebust { 42163519fbcSTrond Myklebust struct nfs_inode *nfsi = NFS_I(dir); 42263519fbcSTrond Myklebust 42363519fbcSTrond Myklebust if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && 42463519fbcSTrond Myklebust !list_empty(&nfsi->open_files)) 42563519fbcSTrond Myklebust set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); 426d69ee9b8STrond Myklebust } 427d69ee9b8STrond Myklebust 428311324adSTrond Myklebust /* 429311324adSTrond Myklebust * This function is mainly for use by nfs_getattr(). 430311324adSTrond Myklebust * 431311324adSTrond Myklebust * If this is an 'ls -l', we want to force use of readdirplus. 432311324adSTrond Myklebust * Do this by checking if there is an active file descriptor 433311324adSTrond Myklebust * and calling nfs_advise_use_readdirplus, then forcing a 434311324adSTrond Myklebust * cache flush. 435311324adSTrond Myklebust */ 436311324adSTrond Myklebust void nfs_force_use_readdirplus(struct inode *dir) 437311324adSTrond Myklebust { 43863519fbcSTrond Myklebust struct nfs_inode *nfsi = NFS_I(dir); 43963519fbcSTrond Myklebust 44063519fbcSTrond Myklebust if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && 44163519fbcSTrond Myklebust !list_empty(&nfsi->open_files)) { 44263519fbcSTrond Myklebust set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); 44379f687a3STrond Myklebust invalidate_mapping_pages(dir->i_mapping, 0, -1); 444311324adSTrond Myklebust } 445311324adSTrond Myklebust } 446311324adSTrond Myklebust 447d69ee9b8STrond Myklebust static 448d39ab9deSBryan Schumaker void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) 449d39ab9deSBryan Schumaker { 45026fe5750SLinus Torvalds struct qstr filename = QSTR_INIT(entry->name, entry->len); 4519ac3d3e8SAl Viro DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); 4524a201d6eSTrond Myklebust struct dentry *dentry; 4534a201d6eSTrond Myklebust struct dentry *alias; 4542b0143b5SDavid Howells struct inode *dir = d_inode(parent); 455d39ab9deSBryan Schumaker struct inode *inode; 456aa9c2669SDavid Quigley int status; 457d39ab9deSBryan Schumaker 458fa923369STrond Myklebust if (!(entry->fattr->valid & NFS_ATTR_FATTR_FILEID)) 459fa923369STrond Myklebust return; 4606c441c25STrond Myklebust if (!(entry->fattr->valid & NFS_ATTR_FATTR_FSID)) 4616c441c25STrond Myklebust return; 46278d04af4STrond Myklebust if (filename.len == 0) 46378d04af4STrond Myklebust return; 46478d04af4STrond Myklebust /* Validate that the name doesn't contain any illegal '\0' */ 46578d04af4STrond Myklebust if (strnlen(filename.name, filename.len) != filename.len) 46678d04af4STrond Myklebust return; 46778d04af4STrond Myklebust /* ...or '/' */ 46878d04af4STrond Myklebust if (strnchr(filename.name, filename.len, '/')) 46978d04af4STrond Myklebust return; 4704a201d6eSTrond Myklebust if (filename.name[0] == '.') { 4714a201d6eSTrond Myklebust if (filename.len == 1) 4724a201d6eSTrond Myklebust return; 4734a201d6eSTrond Myklebust if (filename.len == 2 && filename.name[1] == '.') 4744a201d6eSTrond Myklebust return; 4754a201d6eSTrond Myklebust } 4768387ff25SLinus Torvalds filename.hash = full_name_hash(parent, filename.name, filename.len); 477d39ab9deSBryan Schumaker 4784a201d6eSTrond Myklebust dentry = d_lookup(parent, &filename); 4799ac3d3e8SAl Viro again: 4809ac3d3e8SAl Viro if (!dentry) { 4819ac3d3e8SAl Viro dentry = d_alloc_parallel(parent, &filename, &wq); 4829ac3d3e8SAl Viro if (IS_ERR(dentry)) 4839ac3d3e8SAl Viro return; 4849ac3d3e8SAl Viro } 4859ac3d3e8SAl Viro if (!d_in_lookup(dentry)) { 4866c441c25STrond Myklebust /* Is there a mountpoint here? If so, just exit */ 4876c441c25STrond Myklebust if (!nfs_fsid_equal(&NFS_SB(dentry->d_sb)->fsid, 4886c441c25STrond Myklebust &entry->fattr->fsid)) 4896c441c25STrond Myklebust goto out; 490d39ab9deSBryan Schumaker if (nfs_same_file(dentry, entry)) { 4917dc72d5fSTrond Myklebust if (!entry->fh->size) 4927dc72d5fSTrond Myklebust goto out; 493cda57a1eSJeff Layton nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 4942b0143b5SDavid Howells status = nfs_refresh_inode(d_inode(dentry), entry->fattr); 495aa9c2669SDavid Quigley if (!status) 4962b0143b5SDavid Howells nfs_setsecurity(d_inode(dentry), entry->fattr, entry->label); 497d39ab9deSBryan Schumaker goto out; 498d39ab9deSBryan Schumaker } else { 4995542aa2fSEric W. Biederman d_invalidate(dentry); 500d39ab9deSBryan Schumaker dput(dentry); 5019ac3d3e8SAl Viro dentry = NULL; 5029ac3d3e8SAl Viro goto again; 503d39ab9deSBryan Schumaker } 504d39ab9deSBryan Schumaker } 5057dc72d5fSTrond Myklebust if (!entry->fh->size) { 5067dc72d5fSTrond Myklebust d_lookup_done(dentry); 5077dc72d5fSTrond Myklebust goto out; 5087dc72d5fSTrond Myklebust } 509d39ab9deSBryan Schumaker 5101775fd3eSDavid Quigley inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label); 51141d28bcaSAl Viro alias = d_splice_alias(inode, dentry); 5129ac3d3e8SAl Viro d_lookup_done(dentry); 5139ac3d3e8SAl Viro if (alias) { 514d39ab9deSBryan Schumaker if (IS_ERR(alias)) 515d39ab9deSBryan Schumaker goto out; 5169ac3d3e8SAl Viro dput(dentry); 5179ac3d3e8SAl Viro dentry = alias; 5189ac3d3e8SAl Viro } 519d39ab9deSBryan Schumaker nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 520d39ab9deSBryan Schumaker out: 521d39ab9deSBryan Schumaker dput(dentry); 522d39ab9deSBryan Schumaker } 523d39ab9deSBryan Schumaker 524d1bacf9eSBryan Schumaker /* Perform conversion from xdr to cache array */ 525d1bacf9eSBryan Schumaker static 5268cd51a0cSTrond Myklebust int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, 5276650239aSTrond Myklebust struct page **xdr_pages, struct page *page, unsigned int buflen) 528d1bacf9eSBryan Schumaker { 529babddc72SBryan Schumaker struct xdr_stream stream; 530f7da7a12SBenny Halevy struct xdr_buf buf; 5316650239aSTrond Myklebust struct page *scratch; 53299424380SBryan Schumaker struct nfs_cache_array *array; 5335c346854STrond Myklebust unsigned int count = 0; 5345c346854STrond Myklebust int status; 535be4c2d47Sluanshi int max_rapages = NFS_MAX_READDIR_RAPAGES; 536be4c2d47Sluanshi 537be4c2d47Sluanshi desc->pvec.index = desc->page_index; 538be4c2d47Sluanshi desc->pvec.nr = 0; 539babddc72SBryan Schumaker 5406650239aSTrond Myklebust scratch = alloc_page(GFP_KERNEL); 5416650239aSTrond Myklebust if (scratch == NULL) 5426650239aSTrond Myklebust return -ENOMEM; 543babddc72SBryan Schumaker 544ce85cfbeSBenjamin Coddington if (buflen == 0) 545ce85cfbeSBenjamin Coddington goto out_nopages; 546ce85cfbeSBenjamin Coddington 547f7da7a12SBenny Halevy xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); 5486650239aSTrond Myklebust xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); 54999424380SBryan Schumaker 55099424380SBryan Schumaker do { 55199424380SBryan Schumaker status = xdr_decode(desc, entry, &stream); 5528cd51a0cSTrond Myklebust if (status != 0) { 5538cd51a0cSTrond Myklebust if (status == -EAGAIN) 5548cd51a0cSTrond Myklebust status = 0; 55599424380SBryan Schumaker break; 5568cd51a0cSTrond Myklebust } 55799424380SBryan Schumaker 5585c346854STrond Myklebust count++; 5595c346854STrond Myklebust 560a7a3b1e9SBenjamin Coddington if (desc->plus) 561be62a1a8SMiklos Szeredi nfs_prime_dcache(file_dentry(desc->file), entry); 5628cd51a0cSTrond Myklebust 563be4c2d47Sluanshi status = nfs_readdir_add_to_array(entry, desc->pvec.pages[desc->pvec.nr]); 564be4c2d47Sluanshi if (status == -ENOSPC) { 565be4c2d47Sluanshi desc->pvec.nr++; 566be4c2d47Sluanshi if (desc->pvec.nr == max_rapages) 567be4c2d47Sluanshi break; 568be4c2d47Sluanshi status = nfs_readdir_add_to_array(entry, desc->pvec.pages[desc->pvec.nr]); 569be4c2d47Sluanshi } 5708cd51a0cSTrond Myklebust if (status != 0) 5718cd51a0cSTrond Myklebust break; 57299424380SBryan Schumaker } while (!entry->eof); 57399424380SBryan Schumaker 574be4c2d47Sluanshi /* 575be4c2d47Sluanshi * page and desc->pvec.pages[0] are valid, don't need to check 576be4c2d47Sluanshi * whether or not to be NULL. 577be4c2d47Sluanshi */ 578be4c2d47Sluanshi copy_highpage(page, desc->pvec.pages[0]); 579be4c2d47Sluanshi 580ce85cfbeSBenjamin Coddington out_nopages: 58147c716cbSTrond Myklebust if (count == 0 || (status == -EBADCOOKIE && entry->eof != 0)) { 582be4c2d47Sluanshi array = kmap_atomic(desc->pvec.pages[desc->pvec.nr]); 5838cd51a0cSTrond Myklebust array->eof_index = array->size; 58499424380SBryan Schumaker status = 0; 585be4c2d47Sluanshi kunmap_atomic(array); 58656e4ebf8SBryan Schumaker } 5876650239aSTrond Myklebust 5886650239aSTrond Myklebust put_page(scratch); 589be4c2d47Sluanshi 590be4c2d47Sluanshi /* 591be4c2d47Sluanshi * desc->pvec.nr > 0 means at least one page was completely filled, 592be4c2d47Sluanshi * we should return -ENOSPC. Otherwise function 593be4c2d47Sluanshi * nfs_readdir_xdr_to_array will enter infinite loop. 594be4c2d47Sluanshi */ 595be4c2d47Sluanshi if (desc->pvec.nr > 0) 596be4c2d47Sluanshi return -ENOSPC; 5978cd51a0cSTrond Myklebust return status; 5988cd51a0cSTrond Myklebust } 59956e4ebf8SBryan Schumaker 60056e4ebf8SBryan Schumaker static 601c7e9668eSAnna Schumaker void nfs_readdir_free_pages(struct page **pages, unsigned int npages) 60256e4ebf8SBryan Schumaker { 60356e4ebf8SBryan Schumaker unsigned int i; 60456e4ebf8SBryan Schumaker for (i = 0; i < npages; i++) 60556e4ebf8SBryan Schumaker put_page(pages[i]); 60656e4ebf8SBryan Schumaker } 60756e4ebf8SBryan Schumaker 60856e4ebf8SBryan Schumaker /* 609bf211ca1Szhangliguang * nfs_readdir_alloc_pages() will allocate pages that must be freed with a call 610bf211ca1Szhangliguang * to nfs_readdir_free_pages() 61156e4ebf8SBryan Schumaker */ 61256e4ebf8SBryan Schumaker static 613c7e9668eSAnna Schumaker int nfs_readdir_alloc_pages(struct page **pages, unsigned int npages) 61456e4ebf8SBryan Schumaker { 61556e4ebf8SBryan Schumaker unsigned int i; 61656e4ebf8SBryan Schumaker 61756e4ebf8SBryan Schumaker for (i = 0; i < npages; i++) { 61856e4ebf8SBryan Schumaker struct page *page = alloc_page(GFP_KERNEL); 61956e4ebf8SBryan Schumaker if (page == NULL) 62056e4ebf8SBryan Schumaker goto out_freepages; 62156e4ebf8SBryan Schumaker pages[i] = page; 62256e4ebf8SBryan Schumaker } 6236650239aSTrond Myklebust return 0; 62456e4ebf8SBryan Schumaker 62556e4ebf8SBryan Schumaker out_freepages: 626c7e9668eSAnna Schumaker nfs_readdir_free_pages(pages, i); 6276650239aSTrond Myklebust return -ENOMEM; 628d1bacf9eSBryan Schumaker } 629d1bacf9eSBryan Schumaker 630be4c2d47Sluanshi /* 631be4c2d47Sluanshi * nfs_readdir_rapages_init initialize rapages by nfs_cache_array structure. 632be4c2d47Sluanshi */ 633be4c2d47Sluanshi static 634be4c2d47Sluanshi void nfs_readdir_rapages_init(nfs_readdir_descriptor_t *desc) 635be4c2d47Sluanshi { 636be4c2d47Sluanshi struct nfs_cache_array *array; 637be4c2d47Sluanshi int max_rapages = NFS_MAX_READDIR_RAPAGES; 638be4c2d47Sluanshi int index; 639be4c2d47Sluanshi 640be4c2d47Sluanshi for (index = 0; index < max_rapages; index++) { 641be4c2d47Sluanshi array = kmap_atomic(desc->pvec.pages[index]); 642be4c2d47Sluanshi memset(array, 0, sizeof(struct nfs_cache_array)); 643be4c2d47Sluanshi array->eof_index = -1; 644be4c2d47Sluanshi kunmap_atomic(array); 645be4c2d47Sluanshi } 646be4c2d47Sluanshi } 647be4c2d47Sluanshi 648d1bacf9eSBryan Schumaker static 649d1bacf9eSBryan Schumaker int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) 650d1bacf9eSBryan Schumaker { 65156e4ebf8SBryan Schumaker struct page *pages[NFS_MAX_READDIR_PAGES]; 652d1bacf9eSBryan Schumaker struct nfs_entry entry; 653d1bacf9eSBryan Schumaker struct file *file = desc->file; 654d1bacf9eSBryan Schumaker struct nfs_cache_array *array; 6558cd51a0cSTrond Myklebust int status = -ENOMEM; 65656e4ebf8SBryan Schumaker unsigned int array_size = ARRAY_SIZE(pages); 657d1bacf9eSBryan Schumaker 658be4c2d47Sluanshi /* 659be4c2d47Sluanshi * This means we hit readdir rdpages miss, the preallocated rdpages 660be4c2d47Sluanshi * are useless, the preallocate rdpages should be reinitialized. 661be4c2d47Sluanshi */ 662be4c2d47Sluanshi nfs_readdir_rapages_init(desc); 663be4c2d47Sluanshi 664d1bacf9eSBryan Schumaker entry.prev_cookie = 0; 6650aded708STrond Myklebust entry.cookie = desc->last_cookie; 666d1bacf9eSBryan Schumaker entry.eof = 0; 667d1bacf9eSBryan Schumaker entry.fh = nfs_alloc_fhandle(); 668d1bacf9eSBryan Schumaker entry.fattr = nfs_alloc_fattr(); 669573c4e1eSChuck Lever entry.server = NFS_SERVER(inode); 670d1bacf9eSBryan Schumaker if (entry.fh == NULL || entry.fattr == NULL) 671d1bacf9eSBryan Schumaker goto out; 672d1bacf9eSBryan Schumaker 67314c43f76SDavid Quigley entry.label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); 67414c43f76SDavid Quigley if (IS_ERR(entry.label)) { 67514c43f76SDavid Quigley status = PTR_ERR(entry.label); 67614c43f76SDavid Quigley goto out; 67714c43f76SDavid Quigley } 67814c43f76SDavid Quigley 6790795bf83SFabian Frederick array = kmap(page); 680d1bacf9eSBryan Schumaker memset(array, 0, sizeof(struct nfs_cache_array)); 681d1bacf9eSBryan Schumaker array->eof_index = -1; 682d1bacf9eSBryan Schumaker 683c7e9668eSAnna Schumaker status = nfs_readdir_alloc_pages(pages, array_size); 6846650239aSTrond Myklebust if (status < 0) 685d1bacf9eSBryan Schumaker goto out_release_array; 686d1bacf9eSBryan Schumaker do { 687ac396128STrond Myklebust unsigned int pglen; 68856e4ebf8SBryan Schumaker status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); 689babddc72SBryan Schumaker 690d1bacf9eSBryan Schumaker if (status < 0) 691d1bacf9eSBryan Schumaker break; 692ac396128STrond Myklebust pglen = status; 6936650239aSTrond Myklebust status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); 6948cd51a0cSTrond Myklebust if (status < 0) { 6958cd51a0cSTrond Myklebust if (status == -ENOSPC) 6968cd51a0cSTrond Myklebust status = 0; 6978cd51a0cSTrond Myklebust break; 6988cd51a0cSTrond Myklebust } 6998cd51a0cSTrond Myklebust } while (array->eof_index < 0); 700d1bacf9eSBryan Schumaker 701c7e9668eSAnna Schumaker nfs_readdir_free_pages(pages, array_size); 702d1bacf9eSBryan Schumaker out_release_array: 7030795bf83SFabian Frederick kunmap(page); 70414c43f76SDavid Quigley nfs4_label_free(entry.label); 705d1bacf9eSBryan Schumaker out: 706d1bacf9eSBryan Schumaker nfs_free_fattr(entry.fattr); 707d1bacf9eSBryan Schumaker nfs_free_fhandle(entry.fh); 708d1bacf9eSBryan Schumaker return status; 709d1bacf9eSBryan Schumaker } 710d1bacf9eSBryan Schumaker 711d1bacf9eSBryan Schumaker /* 712d1bacf9eSBryan Schumaker * Now we cache directories properly, by converting xdr information 713d1bacf9eSBryan Schumaker * to an array that can be used for lookups later. This results in 714d1bacf9eSBryan Schumaker * fewer cache pages, since we can store more information on each page. 715d1bacf9eSBryan Schumaker * We only need to convert from xdr once so future lookups are much simpler 7161da177e4SLinus Torvalds */ 717d1bacf9eSBryan Schumaker static 718a46126ccSChristoph Hellwig int nfs_readdir_filler(void *data, struct page* page) 719d1bacf9eSBryan Schumaker { 720a46126ccSChristoph Hellwig nfs_readdir_descriptor_t *desc = data; 721496ad9aaSAl Viro struct inode *inode = file_inode(desc->file); 7228cd51a0cSTrond Myklebust int ret; 723d1bacf9eSBryan Schumaker 724be4c2d47Sluanshi /* 725be4c2d47Sluanshi * If desc->page_index in range desc->pvec.index and 726be4c2d47Sluanshi * desc->pvec.index + desc->pvec.nr, we get readdir cache hit. 727be4c2d47Sluanshi */ 728be4c2d47Sluanshi if (desc->page_index >= desc->pvec.index && 729be4c2d47Sluanshi desc->page_index < (desc->pvec.index + desc->pvec.nr)) { 730be4c2d47Sluanshi /* 731be4c2d47Sluanshi * page and desc->pvec.pages[x] are valid, don't need to check 732be4c2d47Sluanshi * whether or not to be NULL. 733be4c2d47Sluanshi */ 734be4c2d47Sluanshi copy_highpage(page, desc->pvec.pages[desc->page_index - desc->pvec.index]); 735be4c2d47Sluanshi ret = 0; 736be4c2d47Sluanshi } else { 7378cd51a0cSTrond Myklebust ret = nfs_readdir_xdr_to_array(desc, page, inode); 7388cd51a0cSTrond Myklebust if (ret < 0) 739d1bacf9eSBryan Schumaker goto error; 740be4c2d47Sluanshi } 741be4c2d47Sluanshi 742d1bacf9eSBryan Schumaker SetPageUptodate(page); 743d1bacf9eSBryan Schumaker 7442aac05a9STrond Myklebust if (invalidate_inode_pages2_range(inode->i_mapping, page->index + 1, -1) < 0) { 745cd9ae2b6STrond Myklebust /* Should never happen */ 746cd9ae2b6STrond Myklebust nfs_zap_mapping(inode, inode->i_mapping); 747cd9ae2b6STrond Myklebust } 7481da177e4SLinus Torvalds unlock_page(page); 7491da177e4SLinus Torvalds return 0; 7501da177e4SLinus Torvalds error: 7511da177e4SLinus Torvalds unlock_page(page); 7528cd51a0cSTrond Myklebust return ret; 7531da177e4SLinus Torvalds } 7541da177e4SLinus Torvalds 755d1bacf9eSBryan Schumaker static 756d1bacf9eSBryan Schumaker void cache_page_release(nfs_readdir_descriptor_t *desc) 7571da177e4SLinus Torvalds { 758b044f645SBenjamin Coddington if (!desc->page->mapping) 75911de3b11STrond Myklebust nfs_readdir_clear_array(desc->page); 76009cbfeafSKirill A. Shutemov put_page(desc->page); 7611da177e4SLinus Torvalds desc->page = NULL; 7621da177e4SLinus Torvalds } 7631da177e4SLinus Torvalds 764d1bacf9eSBryan Schumaker static 765d1bacf9eSBryan Schumaker struct page *get_cache_page(nfs_readdir_descriptor_t *desc) 7661da177e4SLinus Torvalds { 767a46126ccSChristoph Hellwig return read_cache_page(desc->file->f_mapping, desc->page_index, 768a46126ccSChristoph Hellwig nfs_readdir_filler, desc); 7691da177e4SLinus Torvalds } 7701da177e4SLinus Torvalds 7711da177e4SLinus Torvalds /* 772d1bacf9eSBryan Schumaker * Returns 0 if desc->dir_cookie was found on page desc->page_index 7731da177e4SLinus Torvalds */ 774d1bacf9eSBryan Schumaker static 775d1bacf9eSBryan Schumaker int find_cache_page(nfs_readdir_descriptor_t *desc) 776d1bacf9eSBryan Schumaker { 777d1bacf9eSBryan Schumaker int res; 778d1bacf9eSBryan Schumaker 779d1bacf9eSBryan Schumaker desc->page = get_cache_page(desc); 780d1bacf9eSBryan Schumaker if (IS_ERR(desc->page)) 781d1bacf9eSBryan Schumaker return PTR_ERR(desc->page); 782d1bacf9eSBryan Schumaker 783d1bacf9eSBryan Schumaker res = nfs_readdir_search_array(desc); 78447c716cbSTrond Myklebust if (res != 0) 785d1bacf9eSBryan Schumaker cache_page_release(desc); 786d1bacf9eSBryan Schumaker return res; 787d1bacf9eSBryan Schumaker } 788d1bacf9eSBryan Schumaker 789d1bacf9eSBryan Schumaker /* Search for desc->dir_cookie from the beginning of the page cache */ 7901da177e4SLinus Torvalds static inline 7911da177e4SLinus Torvalds int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) 7921da177e4SLinus Torvalds { 7938cd51a0cSTrond Myklebust int res; 794d1bacf9eSBryan Schumaker 7950aded708STrond Myklebust if (desc->page_index == 0) { 7968cd51a0cSTrond Myklebust desc->current_index = 0; 7970aded708STrond Myklebust desc->last_cookie = 0; 7980aded708STrond Myklebust } 79947c716cbSTrond Myklebust do { 800d1bacf9eSBryan Schumaker res = find_cache_page(desc); 80147c716cbSTrond Myklebust } while (res == -EAGAIN); 8021da177e4SLinus Torvalds return res; 8031da177e4SLinus Torvalds } 8041da177e4SLinus Torvalds 8051da177e4SLinus Torvalds /* 8061da177e4SLinus Torvalds * Once we've found the start of the dirent within a page: fill 'er up... 8071da177e4SLinus Torvalds */ 8081da177e4SLinus Torvalds static 80923db8620SAl Viro int nfs_do_filldir(nfs_readdir_descriptor_t *desc) 8101da177e4SLinus Torvalds { 8111da177e4SLinus Torvalds struct file *file = desc->file; 812d1bacf9eSBryan Schumaker int i = 0; 813d1bacf9eSBryan Schumaker int res = 0; 814d1bacf9eSBryan Schumaker struct nfs_cache_array *array = NULL; 8158ef2ce3eSBryan Schumaker struct nfs_open_dir_context *ctx = file->private_data; 8168ef2ce3eSBryan Schumaker 8170795bf83SFabian Frederick array = kmap(desc->page); 818d1bacf9eSBryan Schumaker for (i = desc->cache_entry_index; i < array->size; i++) { 819ece0b423STrond Myklebust struct nfs_cache_array_entry *ent; 8201da177e4SLinus Torvalds 821ece0b423STrond Myklebust ent = &array->array[i]; 82223db8620SAl Viro if (!dir_emit(desc->ctx, ent->string.name, ent->string.len, 82323db8620SAl Viro nfs_compat_user_ino64(ent->ino), ent->d_type)) { 8246089dd0dSThomas Meyer desc->eof = true; 8251da177e4SLinus Torvalds break; 826ece0b423STrond Myklebust } 82723db8620SAl Viro desc->ctx->pos++; 828d1bacf9eSBryan Schumaker if (i < (array->size-1)) 829d1bacf9eSBryan Schumaker *desc->dir_cookie = array->array[i+1].cookie; 830d1bacf9eSBryan Schumaker else 831d1bacf9eSBryan Schumaker *desc->dir_cookie = array->last_cookie; 8320c030806STrond Myklebust if (ctx->duped != 0) 8330c030806STrond Myklebust ctx->duped = 1; 8348cd51a0cSTrond Myklebust } 83547c716cbSTrond Myklebust if (array->eof_index >= 0) 8366089dd0dSThomas Meyer desc->eof = true; 837d1bacf9eSBryan Schumaker 8380795bf83SFabian Frederick kunmap(desc->page); 839d1bacf9eSBryan Schumaker cache_page_release(desc); 8401e7cb3dcSChuck Lever dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", 8411e7cb3dcSChuck Lever (unsigned long long)*desc->dir_cookie, res); 8421da177e4SLinus Torvalds return res; 8431da177e4SLinus Torvalds } 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvalds /* 8461da177e4SLinus Torvalds * If we cannot find a cookie in our cache, we suspect that this is 8471da177e4SLinus Torvalds * because it points to a deleted file, so we ask the server to return 8481da177e4SLinus Torvalds * whatever it thinks is the next entry. We then feed this to filldir. 8491da177e4SLinus Torvalds * If all goes well, we should then be able to find our way round the 8501da177e4SLinus Torvalds * cache on the next call to readdir_search_pagecache(); 8511da177e4SLinus Torvalds * 8521da177e4SLinus Torvalds * NOTE: we cannot add the anonymous page to the pagecache because 8531da177e4SLinus Torvalds * the data it contains might not be page aligned. Besides, 8541da177e4SLinus Torvalds * we should already have a complete representation of the 8551da177e4SLinus Torvalds * directory in the page cache by the time we get here. 8561da177e4SLinus Torvalds */ 8571da177e4SLinus Torvalds static inline 85823db8620SAl Viro int uncached_readdir(nfs_readdir_descriptor_t *desc) 8591da177e4SLinus Torvalds { 8601da177e4SLinus Torvalds struct page *page = NULL; 8611da177e4SLinus Torvalds int status; 862496ad9aaSAl Viro struct inode *inode = file_inode(desc->file); 8630c030806STrond Myklebust struct nfs_open_dir_context *ctx = desc->file->private_data; 8641da177e4SLinus Torvalds 8651e7cb3dcSChuck Lever dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", 8661e7cb3dcSChuck Lever (unsigned long long)*desc->dir_cookie); 8671da177e4SLinus Torvalds 8681da177e4SLinus Torvalds page = alloc_page(GFP_HIGHUSER); 8691da177e4SLinus Torvalds if (!page) { 8701da177e4SLinus Torvalds status = -ENOMEM; 8711da177e4SLinus Torvalds goto out; 8721da177e4SLinus Torvalds } 8731da177e4SLinus Torvalds 8747a8e1dc3STrond Myklebust desc->page_index = 0; 8750aded708STrond Myklebust desc->last_cookie = *desc->dir_cookie; 8767a8e1dc3STrond Myklebust desc->page = page; 8770c030806STrond Myklebust ctx->duped = 0; 8787a8e1dc3STrond Myklebust 87985f8607eSTrond Myklebust status = nfs_readdir_xdr_to_array(desc, page, inode); 88085f8607eSTrond Myklebust if (status < 0) 881d1bacf9eSBryan Schumaker goto out_release; 882d1bacf9eSBryan Schumaker 88323db8620SAl Viro status = nfs_do_filldir(desc); 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds out: 8861e7cb3dcSChuck Lever dfprintk(DIRCACHE, "NFS: %s: returns %d\n", 8873110ff80SHarvey Harrison __func__, status); 8881da177e4SLinus Torvalds return status; 8891da177e4SLinus Torvalds out_release: 890d1bacf9eSBryan Schumaker cache_page_release(desc); 8911da177e4SLinus Torvalds goto out; 8921da177e4SLinus Torvalds } 8931da177e4SLinus Torvalds 89400a92642SOlivier Galibert /* The file offset position represents the dirent entry number. A 89500a92642SOlivier Galibert last cookie cache takes care of the common case of reading the 89600a92642SOlivier Galibert whole directory. 8971da177e4SLinus Torvalds */ 89823db8620SAl Viro static int nfs_readdir(struct file *file, struct dir_context *ctx) 8991da177e4SLinus Torvalds { 900be62a1a8SMiklos Szeredi struct dentry *dentry = file_dentry(file); 9012b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 9021da177e4SLinus Torvalds nfs_readdir_descriptor_t my_desc, 9031da177e4SLinus Torvalds *desc = &my_desc; 90423db8620SAl Viro struct nfs_open_dir_context *dir_ctx = file->private_data; 90507b5ce8eSScott Mayhew int res = 0; 906be4c2d47Sluanshi int max_rapages = NFS_MAX_READDIR_RAPAGES; 9071da177e4SLinus Torvalds 9086de1472fSAl Viro dfprintk(FILE, "NFS: readdir(%pD2) starting at cookie %llu\n", 9096de1472fSAl Viro file, (long long)ctx->pos); 91091d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); 91191d5b470SChuck Lever 9121da177e4SLinus Torvalds /* 91323db8620SAl Viro * ctx->pos points to the dirent entry number. 914f0dd2136STrond Myklebust * *desc->dir_cookie has the cookie for the next entry. We have 91500a92642SOlivier Galibert * to either find the entry with the appropriate number or 91600a92642SOlivier Galibert * revalidate the cookie. 9171da177e4SLinus Torvalds */ 9181da177e4SLinus Torvalds memset(desc, 0, sizeof(*desc)); 9191da177e4SLinus Torvalds 92023db8620SAl Viro desc->file = file; 92123db8620SAl Viro desc->ctx = ctx; 922480c2006SBryan Schumaker desc->dir_cookie = &dir_ctx->dir_cookie; 9231da177e4SLinus Torvalds desc->decode = NFS_PROTO(inode)->decode_dirent; 924a7a3b1e9SBenjamin Coddington desc->plus = nfs_use_readdirplus(inode, ctx); 9251da177e4SLinus Torvalds 926be4c2d47Sluanshi res = nfs_readdir_alloc_pages(desc->pvec.pages, max_rapages); 927be4c2d47Sluanshi if (res < 0) 928be4c2d47Sluanshi return -ENOMEM; 929be4c2d47Sluanshi 930be4c2d47Sluanshi nfs_readdir_rapages_init(desc); 931be4c2d47Sluanshi 93279f687a3STrond Myklebust if (ctx->pos == 0 || nfs_attribute_cache_expired(inode)) 93323db8620SAl Viro res = nfs_revalidate_mapping(inode, file->f_mapping); 934fccca7fcSTrond Myklebust if (res < 0) 935fccca7fcSTrond Myklebust goto out; 936fccca7fcSTrond Myklebust 93747c716cbSTrond Myklebust do { 9381da177e4SLinus Torvalds res = readdir_search_pagecache(desc); 93900a92642SOlivier Galibert 9401da177e4SLinus Torvalds if (res == -EBADCOOKIE) { 941ece0b423STrond Myklebust res = 0; 9421da177e4SLinus Torvalds /* This means either end of directory */ 9436089dd0dSThomas Meyer if (*desc->dir_cookie && !desc->eof) { 9441da177e4SLinus Torvalds /* Or that the server has 'lost' a cookie */ 94523db8620SAl Viro res = uncached_readdir(desc); 946ece0b423STrond Myklebust if (res == 0) 9471da177e4SLinus Torvalds continue; 9481da177e4SLinus Torvalds } 9491da177e4SLinus Torvalds break; 9501da177e4SLinus Torvalds } 9511da177e4SLinus Torvalds if (res == -ETOOSMALL && desc->plus) { 9523a10c30aSBenny Halevy clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); 9531da177e4SLinus Torvalds nfs_zap_caches(inode); 954baf57a09STrond Myklebust desc->page_index = 0; 955a7a3b1e9SBenjamin Coddington desc->plus = false; 956a7a3b1e9SBenjamin Coddington desc->eof = false; 9571da177e4SLinus Torvalds continue; 9581da177e4SLinus Torvalds } 9591da177e4SLinus Torvalds if (res < 0) 9601da177e4SLinus Torvalds break; 9611da177e4SLinus Torvalds 96223db8620SAl Viro res = nfs_do_filldir(desc); 963ece0b423STrond Myklebust if (res < 0) 9641da177e4SLinus Torvalds break; 96547c716cbSTrond Myklebust } while (!desc->eof); 966fccca7fcSTrond Myklebust out: 967be4c2d47Sluanshi nfs_readdir_free_pages(desc->pvec.pages, max_rapages); 9681e7cb3dcSChuck Lever if (res > 0) 9691e7cb3dcSChuck Lever res = 0; 9706de1472fSAl Viro dfprintk(FILE, "NFS: readdir(%pD2) returns %d\n", file, res); 9711da177e4SLinus Torvalds return res; 9721da177e4SLinus Torvalds } 9731da177e4SLinus Torvalds 974965c8e59SAndrew Morton static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence) 975f0dd2136STrond Myklebust { 976b044f645SBenjamin Coddington struct inode *inode = file_inode(filp); 977480c2006SBryan Schumaker struct nfs_open_dir_context *dir_ctx = filp->private_data; 978b84e06c5SChuck Lever 9796de1472fSAl Viro dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n", 9806de1472fSAl Viro filp, offset, whence); 981b84e06c5SChuck Lever 982965c8e59SAndrew Morton switch (whence) { 983f0dd2136STrond Myklebust default: 984b2b1ff3dSTrond Myklebust return -EINVAL; 985b2b1ff3dSTrond Myklebust case SEEK_SET: 986b2b1ff3dSTrond Myklebust if (offset < 0) 987b2b1ff3dSTrond Myklebust return -EINVAL; 988b2b1ff3dSTrond Myklebust inode_lock(inode); 989b2b1ff3dSTrond Myklebust break; 990b2b1ff3dSTrond Myklebust case SEEK_CUR: 991b2b1ff3dSTrond Myklebust if (offset == 0) 992b2b1ff3dSTrond Myklebust return filp->f_pos; 993b2b1ff3dSTrond Myklebust inode_lock(inode); 994b2b1ff3dSTrond Myklebust offset += filp->f_pos; 995b2b1ff3dSTrond Myklebust if (offset < 0) { 996b2b1ff3dSTrond Myklebust inode_unlock(inode); 997b2b1ff3dSTrond Myklebust return -EINVAL; 998b2b1ff3dSTrond Myklebust } 999f0dd2136STrond Myklebust } 1000f0dd2136STrond Myklebust if (offset != filp->f_pos) { 1001f0dd2136STrond Myklebust filp->f_pos = offset; 1002480c2006SBryan Schumaker dir_ctx->dir_cookie = 0; 10038ef2ce3eSBryan Schumaker dir_ctx->duped = 0; 1004f0dd2136STrond Myklebust } 1005b044f645SBenjamin Coddington inode_unlock(inode); 1006f0dd2136STrond Myklebust return offset; 1007f0dd2136STrond Myklebust } 1008f0dd2136STrond Myklebust 10091da177e4SLinus Torvalds /* 10101da177e4SLinus Torvalds * All directory operations under NFS are synchronous, so fsync() 10111da177e4SLinus Torvalds * is a dummy operation. 10121da177e4SLinus Torvalds */ 101302c24a82SJosef Bacik static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, 101402c24a82SJosef Bacik int datasync) 10151da177e4SLinus Torvalds { 10166de1472fSAl Viro struct inode *inode = file_inode(filp); 10177ea80859SChristoph Hellwig 10186de1472fSAl Viro dfprintk(FILE, "NFS: fsync dir(%pD2) datasync %d\n", filp, datasync); 10191e7cb3dcSChuck Lever 10205955102cSAl Viro inode_lock(inode); 10216de1472fSAl Viro nfs_inc_stats(inode, NFSIOS_VFSFSYNC); 10225955102cSAl Viro inode_unlock(inode); 10231da177e4SLinus Torvalds return 0; 10241da177e4SLinus Torvalds } 10251da177e4SLinus Torvalds 1026bfc69a45STrond Myklebust /** 1027bfc69a45STrond Myklebust * nfs_force_lookup_revalidate - Mark the directory as having changed 1028302fad7bSTrond Myklebust * @dir: pointer to directory inode 1029bfc69a45STrond Myklebust * 1030bfc69a45STrond Myklebust * This forces the revalidation code in nfs_lookup_revalidate() to do a 1031bfc69a45STrond Myklebust * full lookup on all child dentries of 'dir' whenever a change occurs 1032bfc69a45STrond Myklebust * on the server that might have invalidated our dcache. 1033bfc69a45STrond Myklebust * 1034bfc69a45STrond Myklebust * The caller should be holding dir->i_lock 1035bfc69a45STrond Myklebust */ 1036bfc69a45STrond Myklebust void nfs_force_lookup_revalidate(struct inode *dir) 1037bfc69a45STrond Myklebust { 1038011935a0STrond Myklebust NFS_I(dir)->cache_change_attribute++; 1039bfc69a45STrond Myklebust } 104089d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate); 1041bfc69a45STrond Myklebust 10421da177e4SLinus Torvalds /* 10431da177e4SLinus Torvalds * A check for whether or not the parent directory has changed. 10441da177e4SLinus Torvalds * In the case it has, we assume that the dentries are untrustworthy 10451da177e4SLinus Torvalds * and may need to be looked up again. 1046912a108dSNeilBrown * If rcu_walk prevents us from performing a full check, return 0. 10471da177e4SLinus Torvalds */ 1048912a108dSNeilBrown static int nfs_check_verifier(struct inode *dir, struct dentry *dentry, 1049912a108dSNeilBrown int rcu_walk) 10501da177e4SLinus Torvalds { 10511da177e4SLinus Torvalds if (IS_ROOT(dentry)) 10521da177e4SLinus Torvalds return 1; 10534eec952eSTrond Myklebust if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 10544eec952eSTrond Myklebust return 0; 1055f2c77f4eSTrond Myklebust if (!nfs_verify_change_attribute(dir, dentry->d_time)) 10566ecc5e8fSTrond Myklebust return 0; 1057f2c77f4eSTrond Myklebust /* Revalidate nfsi->cache_change_attribute before we declare a match */ 10581cd9cb05STrond Myklebust if (nfs_mapping_need_revalidate_inode(dir)) { 1059912a108dSNeilBrown if (rcu_walk) 1060f2c77f4eSTrond Myklebust return 0; 10611cd9cb05STrond Myklebust if (__nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) 10621cd9cb05STrond Myklebust return 0; 10631cd9cb05STrond Myklebust } 1064f2c77f4eSTrond Myklebust if (!nfs_verify_change_attribute(dir, dentry->d_time)) 1065f2c77f4eSTrond Myklebust return 0; 1066f2c77f4eSTrond Myklebust return 1; 10671da177e4SLinus Torvalds } 10681da177e4SLinus Torvalds 10691da177e4SLinus Torvalds /* 1070a12802caSTrond Myklebust * Use intent information to check whether or not we're going to do 1071a12802caSTrond Myklebust * an O_EXCL create using this path component. 1072a12802caSTrond Myklebust */ 1073fa3c56bbSAl Viro static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) 1074a12802caSTrond Myklebust { 1075a12802caSTrond Myklebust if (NFS_PROTO(dir)->version == 2) 1076a12802caSTrond Myklebust return 0; 1077fa3c56bbSAl Viro return flags & LOOKUP_EXCL; 1078a12802caSTrond Myklebust } 1079a12802caSTrond Myklebust 1080a12802caSTrond Myklebust /* 10811d6757fbSTrond Myklebust * Inode and filehandle revalidation for lookups. 10821d6757fbSTrond Myklebust * 10831d6757fbSTrond Myklebust * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, 10841d6757fbSTrond Myklebust * or if the intent information indicates that we're about to open this 10851d6757fbSTrond Myklebust * particular file and the "nocto" mount flag is not set. 10861d6757fbSTrond Myklebust * 10871d6757fbSTrond Myklebust */ 108865a0c149STrond Myklebust static 1089fa3c56bbSAl Viro int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) 10901da177e4SLinus Torvalds { 10911da177e4SLinus Torvalds struct nfs_server *server = NFS_SERVER(inode); 109265a0c149STrond Myklebust int ret; 10931da177e4SLinus Torvalds 109436d43a43SDavid Howells if (IS_AUTOMOUNT(inode)) 10954e99a1ffSTrond Myklebust return 0; 109647921921STrond Myklebust 109747921921STrond Myklebust if (flags & LOOKUP_OPEN) { 109847921921STrond Myklebust switch (inode->i_mode & S_IFMT) { 109947921921STrond Myklebust case S_IFREG: 110047921921STrond Myklebust /* A NFSv4 OPEN will revalidate later */ 110147921921STrond Myklebust if (server->caps & NFS_CAP_ATOMIC_OPEN) 110247921921STrond Myklebust goto out; 110347921921STrond Myklebust /* Fallthrough */ 110447921921STrond Myklebust case S_IFDIR: 110547921921STrond Myklebust if (server->flags & NFS_MOUNT_NOCTO) 110647921921STrond Myklebust break; 110747921921STrond Myklebust /* NFS close-to-open cache consistency validation */ 110847921921STrond Myklebust goto out_force; 110947921921STrond Myklebust } 111047921921STrond Myklebust } 111147921921STrond Myklebust 11121da177e4SLinus Torvalds /* VFS wants an on-the-wire revalidation */ 1113fa3c56bbSAl Viro if (flags & LOOKUP_REVAL) 11141da177e4SLinus Torvalds goto out_force; 111565a0c149STrond Myklebust out: 1116a61246c9SLance Shelton return (inode->i_nlink == 0) ? -ESTALE : 0; 11171da177e4SLinus Torvalds out_force: 11181fa1e384SNeilBrown if (flags & LOOKUP_RCU) 11191fa1e384SNeilBrown return -ECHILD; 112065a0c149STrond Myklebust ret = __nfs_revalidate_inode(server, inode); 112165a0c149STrond Myklebust if (ret != 0) 112265a0c149STrond Myklebust return ret; 112365a0c149STrond Myklebust goto out; 11241da177e4SLinus Torvalds } 11251da177e4SLinus Torvalds 11261da177e4SLinus Torvalds /* 11271da177e4SLinus Torvalds * We judge how long we want to trust negative 11281da177e4SLinus Torvalds * dentries by looking at the parent inode mtime. 11291da177e4SLinus Torvalds * 11301da177e4SLinus Torvalds * If parent mtime has changed, we revalidate, else we wait for a 11311da177e4SLinus Torvalds * period corresponding to the parent's attribute cache timeout value. 1132912a108dSNeilBrown * 1133912a108dSNeilBrown * If LOOKUP_RCU prevents us from performing a full check, return 1 1134912a108dSNeilBrown * suggesting a reval is needed. 11359f6d44d4STrond Myklebust * 11369f6d44d4STrond Myklebust * Note that when creating a new file, or looking up a rename target, 11379f6d44d4STrond Myklebust * then it shouldn't be necessary to revalidate a negative dentry. 11381da177e4SLinus Torvalds */ 11391da177e4SLinus Torvalds static inline 11401da177e4SLinus Torvalds int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, 1141fa3c56bbSAl Viro unsigned int flags) 11421da177e4SLinus Torvalds { 11439f6d44d4STrond Myklebust if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) 11441da177e4SLinus Torvalds return 0; 11454eec952eSTrond Myklebust if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) 11464eec952eSTrond Myklebust return 1; 1147912a108dSNeilBrown return !nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU); 11481da177e4SLinus Torvalds } 11491da177e4SLinus Torvalds 11505ceb9d7fSTrond Myklebust static int 11515ceb9d7fSTrond Myklebust nfs_lookup_revalidate_done(struct inode *dir, struct dentry *dentry, 11525ceb9d7fSTrond Myklebust struct inode *inode, int error) 11531da177e4SLinus Torvalds { 11545ceb9d7fSTrond Myklebust switch (error) { 11555ceb9d7fSTrond Myklebust case 1: 11566de1472fSAl Viro dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is valid\n", 11576de1472fSAl Viro __func__, dentry); 11581da177e4SLinus Torvalds return 1; 11595ceb9d7fSTrond Myklebust case 0: 1160a1643a92STrond Myklebust nfs_mark_for_revalidate(dir); 11611da177e4SLinus Torvalds if (inode && S_ISDIR(inode->i_mode)) { 11621da177e4SLinus Torvalds /* Purge readdir caches. */ 11631da177e4SLinus Torvalds nfs_zap_caches(inode); 1164a3f432bfSJ. Bruce Fields /* 1165a3f432bfSJ. Bruce Fields * We can't d_drop the root of a disconnected tree: 1166a3f432bfSJ. Bruce Fields * its d_hash is on the s_anon list and d_drop() would hide 1167a3f432bfSJ. Bruce Fields * it from shrink_dcache_for_unmount(), leading to busy 1168a3f432bfSJ. Bruce Fields * inodes on unmount and further oopses. 1169a3f432bfSJ. Bruce Fields */ 1170a3f432bfSJ. Bruce Fields if (IS_ROOT(dentry)) 11715ceb9d7fSTrond Myklebust return 1; 11721da177e4SLinus Torvalds } 11736de1472fSAl Viro dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is invalid\n", 11746de1472fSAl Viro __func__, dentry); 11751da177e4SLinus Torvalds return 0; 11765ceb9d7fSTrond Myklebust } 11776de1472fSAl Viro dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) lookup returned error %d\n", 11786de1472fSAl Viro __func__, dentry, error); 1179e1fb4d05STrond Myklebust return error; 11801da177e4SLinus Torvalds } 11811da177e4SLinus Torvalds 11825ceb9d7fSTrond Myklebust static int 11835ceb9d7fSTrond Myklebust nfs_lookup_revalidate_negative(struct inode *dir, struct dentry *dentry, 11845ceb9d7fSTrond Myklebust unsigned int flags) 11855ceb9d7fSTrond Myklebust { 11865ceb9d7fSTrond Myklebust int ret = 1; 11875ceb9d7fSTrond Myklebust if (nfs_neg_need_reval(dir, dentry, flags)) { 11885ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) 11895ceb9d7fSTrond Myklebust return -ECHILD; 11905ceb9d7fSTrond Myklebust ret = 0; 11915ceb9d7fSTrond Myklebust } 11925ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, NULL, ret); 11935ceb9d7fSTrond Myklebust } 11945ceb9d7fSTrond Myklebust 11955ceb9d7fSTrond Myklebust static int 11965ceb9d7fSTrond Myklebust nfs_lookup_revalidate_delegated(struct inode *dir, struct dentry *dentry, 11975ceb9d7fSTrond Myklebust struct inode *inode) 11985ceb9d7fSTrond Myklebust { 11995ceb9d7fSTrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 12005ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, 1); 12015ceb9d7fSTrond Myklebust } 12025ceb9d7fSTrond Myklebust 12035ceb9d7fSTrond Myklebust static int 12045ceb9d7fSTrond Myklebust nfs_lookup_revalidate_dentry(struct inode *dir, struct dentry *dentry, 12055ceb9d7fSTrond Myklebust struct inode *inode) 12065ceb9d7fSTrond Myklebust { 12075ceb9d7fSTrond Myklebust struct nfs_fh *fhandle; 12085ceb9d7fSTrond Myklebust struct nfs_fattr *fattr; 12095ceb9d7fSTrond Myklebust struct nfs4_label *label; 12105ceb9d7fSTrond Myklebust int ret; 12115ceb9d7fSTrond Myklebust 12125ceb9d7fSTrond Myklebust ret = -ENOMEM; 12135ceb9d7fSTrond Myklebust fhandle = nfs_alloc_fhandle(); 12145ceb9d7fSTrond Myklebust fattr = nfs_alloc_fattr(); 12155ceb9d7fSTrond Myklebust label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 12165ceb9d7fSTrond Myklebust if (fhandle == NULL || fattr == NULL || IS_ERR(label)) 12175ceb9d7fSTrond Myklebust goto out; 12185ceb9d7fSTrond Myklebust 12195ceb9d7fSTrond Myklebust ret = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); 12205ceb9d7fSTrond Myklebust if (ret < 0) { 12215ceb9d7fSTrond Myklebust if (ret == -ESTALE || ret == -ENOENT) 12225ceb9d7fSTrond Myklebust ret = 0; 12235ceb9d7fSTrond Myklebust goto out; 12245ceb9d7fSTrond Myklebust } 12255ceb9d7fSTrond Myklebust ret = 0; 12265ceb9d7fSTrond Myklebust if (nfs_compare_fh(NFS_FH(inode), fhandle)) 12275ceb9d7fSTrond Myklebust goto out; 12285ceb9d7fSTrond Myklebust if (nfs_refresh_inode(inode, fattr) < 0) 12295ceb9d7fSTrond Myklebust goto out; 12305ceb9d7fSTrond Myklebust 12315ceb9d7fSTrond Myklebust nfs_setsecurity(inode, fattr, label); 12325ceb9d7fSTrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 12335ceb9d7fSTrond Myklebust 12345ceb9d7fSTrond Myklebust /* set a readdirplus hint that we had a cache miss */ 12355ceb9d7fSTrond Myklebust nfs_force_use_readdirplus(dir); 12365ceb9d7fSTrond Myklebust ret = 1; 12375ceb9d7fSTrond Myklebust out: 12385ceb9d7fSTrond Myklebust nfs_free_fattr(fattr); 12395ceb9d7fSTrond Myklebust nfs_free_fhandle(fhandle); 12405ceb9d7fSTrond Myklebust nfs4_label_free(label); 12415ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, ret); 12425ceb9d7fSTrond Myklebust } 12435ceb9d7fSTrond Myklebust 12445ceb9d7fSTrond Myklebust /* 12455ceb9d7fSTrond Myklebust * This is called every time the dcache has a lookup hit, 12465ceb9d7fSTrond Myklebust * and we should check whether we can really trust that 12475ceb9d7fSTrond Myklebust * lookup. 12485ceb9d7fSTrond Myklebust * 12495ceb9d7fSTrond Myklebust * NOTE! The hit can be a negative hit too, don't assume 12505ceb9d7fSTrond Myklebust * we have an inode! 12515ceb9d7fSTrond Myklebust * 12525ceb9d7fSTrond Myklebust * If the parent directory is seen to have changed, we throw out the 12535ceb9d7fSTrond Myklebust * cached dentry and do a new lookup. 12545ceb9d7fSTrond Myklebust */ 12555ceb9d7fSTrond Myklebust static int 12565ceb9d7fSTrond Myklebust nfs_do_lookup_revalidate(struct inode *dir, struct dentry *dentry, 12575ceb9d7fSTrond Myklebust unsigned int flags) 12585ceb9d7fSTrond Myklebust { 12595ceb9d7fSTrond Myklebust struct inode *inode; 12605ceb9d7fSTrond Myklebust int error; 12615ceb9d7fSTrond Myklebust 12625ceb9d7fSTrond Myklebust nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); 12635ceb9d7fSTrond Myklebust inode = d_inode(dentry); 12645ceb9d7fSTrond Myklebust 12655ceb9d7fSTrond Myklebust if (!inode) 12665ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_negative(dir, dentry, flags); 12675ceb9d7fSTrond Myklebust 12685ceb9d7fSTrond Myklebust if (is_bad_inode(inode)) { 12695ceb9d7fSTrond Myklebust dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", 12705ceb9d7fSTrond Myklebust __func__, dentry); 12715ceb9d7fSTrond Myklebust goto out_bad; 12725ceb9d7fSTrond Myklebust } 12735ceb9d7fSTrond Myklebust 12745ceb9d7fSTrond Myklebust if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ)) 12755ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_delegated(dir, dentry, inode); 12765ceb9d7fSTrond Myklebust 12775ceb9d7fSTrond Myklebust /* Force a full look up iff the parent directory has changed */ 12785ceb9d7fSTrond Myklebust if (!(flags & (LOOKUP_EXCL | LOOKUP_REVAL)) && 12795ceb9d7fSTrond Myklebust nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) { 12805ceb9d7fSTrond Myklebust error = nfs_lookup_verify_inode(inode, flags); 12815ceb9d7fSTrond Myklebust if (error) { 12825ceb9d7fSTrond Myklebust if (error == -ESTALE) 12835ceb9d7fSTrond Myklebust nfs_zap_caches(dir); 12845ceb9d7fSTrond Myklebust goto out_bad; 12855ceb9d7fSTrond Myklebust } 12865ceb9d7fSTrond Myklebust nfs_advise_use_readdirplus(dir); 12875ceb9d7fSTrond Myklebust goto out_valid; 12885ceb9d7fSTrond Myklebust } 12895ceb9d7fSTrond Myklebust 12905ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) 12915ceb9d7fSTrond Myklebust return -ECHILD; 12925ceb9d7fSTrond Myklebust 12935ceb9d7fSTrond Myklebust if (NFS_STALE(inode)) 12945ceb9d7fSTrond Myklebust goto out_bad; 12955ceb9d7fSTrond Myklebust 12965ceb9d7fSTrond Myklebust trace_nfs_lookup_revalidate_enter(dir, dentry, flags); 12975ceb9d7fSTrond Myklebust error = nfs_lookup_revalidate_dentry(dir, dentry, inode); 12985ceb9d7fSTrond Myklebust trace_nfs_lookup_revalidate_exit(dir, dentry, flags, error); 12995ceb9d7fSTrond Myklebust return error; 13005ceb9d7fSTrond Myklebust out_valid: 13015ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, 1); 13025ceb9d7fSTrond Myklebust out_bad: 13035ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) 13045ceb9d7fSTrond Myklebust return -ECHILD; 13055ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, 0); 13065ceb9d7fSTrond Myklebust } 13075ceb9d7fSTrond Myklebust 13085ceb9d7fSTrond Myklebust static int 1309c7944ebbSTrond Myklebust __nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags, 1310c7944ebbSTrond Myklebust int (*reval)(struct inode *, struct dentry *, unsigned int)) 13115ceb9d7fSTrond Myklebust { 13125ceb9d7fSTrond Myklebust struct dentry *parent; 13135ceb9d7fSTrond Myklebust struct inode *dir; 13145ceb9d7fSTrond Myklebust int ret; 13155ceb9d7fSTrond Myklebust 13165ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) { 13175ceb9d7fSTrond Myklebust parent = READ_ONCE(dentry->d_parent); 13185ceb9d7fSTrond Myklebust dir = d_inode_rcu(parent); 13195ceb9d7fSTrond Myklebust if (!dir) 13205ceb9d7fSTrond Myklebust return -ECHILD; 1321c7944ebbSTrond Myklebust ret = reval(dir, dentry, flags); 13225ceb9d7fSTrond Myklebust if (parent != READ_ONCE(dentry->d_parent)) 13235ceb9d7fSTrond Myklebust return -ECHILD; 13245ceb9d7fSTrond Myklebust } else { 13255ceb9d7fSTrond Myklebust parent = dget_parent(dentry); 1326c7944ebbSTrond Myklebust ret = reval(d_inode(parent), dentry, flags); 13275ceb9d7fSTrond Myklebust dput(parent); 13285ceb9d7fSTrond Myklebust } 13295ceb9d7fSTrond Myklebust return ret; 13305ceb9d7fSTrond Myklebust } 13315ceb9d7fSTrond Myklebust 1332c7944ebbSTrond Myklebust static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) 1333c7944ebbSTrond Myklebust { 1334c7944ebbSTrond Myklebust return __nfs_lookup_revalidate(dentry, flags, nfs_do_lookup_revalidate); 1335c7944ebbSTrond Myklebust } 1336c7944ebbSTrond Myklebust 13371da177e4SLinus Torvalds /* 13382b0143b5SDavid Howells * A weaker form of d_revalidate for revalidating just the d_inode(dentry) 1339ecf3d1f1SJeff Layton * when we don't really care about the dentry name. This is called when a 1340ecf3d1f1SJeff Layton * pathwalk ends on a dentry that was not found via a normal lookup in the 1341ecf3d1f1SJeff Layton * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals). 1342ecf3d1f1SJeff Layton * 1343ecf3d1f1SJeff Layton * In this situation, we just want to verify that the inode itself is OK 1344ecf3d1f1SJeff Layton * since the dentry might have changed on the server. 1345ecf3d1f1SJeff Layton */ 1346ecf3d1f1SJeff Layton static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags) 1347ecf3d1f1SJeff Layton { 13482b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 13499cdd1d3fSTrond Myklebust int error = 0; 1350ecf3d1f1SJeff Layton 1351ecf3d1f1SJeff Layton /* 1352ecf3d1f1SJeff Layton * I believe we can only get a negative dentry here in the case of a 1353ecf3d1f1SJeff Layton * procfs-style symlink. Just assume it's correct for now, but we may 1354ecf3d1f1SJeff Layton * eventually need to do something more here. 1355ecf3d1f1SJeff Layton */ 1356ecf3d1f1SJeff Layton if (!inode) { 13576de1472fSAl Viro dfprintk(LOOKUPCACHE, "%s: %pd2 has negative inode\n", 13586de1472fSAl Viro __func__, dentry); 1359ecf3d1f1SJeff Layton return 1; 1360ecf3d1f1SJeff Layton } 1361ecf3d1f1SJeff Layton 1362ecf3d1f1SJeff Layton if (is_bad_inode(inode)) { 13636de1472fSAl Viro dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", 13646de1472fSAl Viro __func__, dentry); 1365ecf3d1f1SJeff Layton return 0; 1366ecf3d1f1SJeff Layton } 1367ecf3d1f1SJeff Layton 1368b688741cSNeilBrown error = nfs_lookup_verify_inode(inode, flags); 1369ecf3d1f1SJeff Layton dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n", 1370ecf3d1f1SJeff Layton __func__, inode->i_ino, error ? "invalid" : "valid"); 1371ecf3d1f1SJeff Layton return !error; 1372ecf3d1f1SJeff Layton } 1373ecf3d1f1SJeff Layton 1374ecf3d1f1SJeff Layton /* 13751da177e4SLinus Torvalds * This is called from dput() when d_count is going to 0. 13761da177e4SLinus Torvalds */ 1377fe15ce44SNick Piggin static int nfs_dentry_delete(const struct dentry *dentry) 13781da177e4SLinus Torvalds { 13796de1472fSAl Viro dfprintk(VFS, "NFS: dentry_delete(%pd2, %x)\n", 13806de1472fSAl Viro dentry, dentry->d_flags); 13811da177e4SLinus Torvalds 138277f11192STrond Myklebust /* Unhash any dentry with a stale inode */ 13832b0143b5SDavid Howells if (d_really_is_positive(dentry) && NFS_STALE(d_inode(dentry))) 138477f11192STrond Myklebust return 1; 138577f11192STrond Myklebust 13861da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { 13871da177e4SLinus Torvalds /* Unhash it, so that ->d_iput() would be called */ 13881da177e4SLinus Torvalds return 1; 13891da177e4SLinus Torvalds } 13901751e8a6SLinus Torvalds if (!(dentry->d_sb->s_flags & SB_ACTIVE)) { 13911da177e4SLinus Torvalds /* Unhash it, so that ancestors of killed async unlink 13921da177e4SLinus Torvalds * files will be cleaned up during umount */ 13931da177e4SLinus Torvalds return 1; 13941da177e4SLinus Torvalds } 13951da177e4SLinus Torvalds return 0; 13961da177e4SLinus Torvalds 13971da177e4SLinus Torvalds } 13981da177e4SLinus Torvalds 13991f018458STrond Myklebust /* Ensure that we revalidate inode->i_nlink */ 14001b83d707STrond Myklebust static void nfs_drop_nlink(struct inode *inode) 14011b83d707STrond Myklebust { 14021b83d707STrond Myklebust spin_lock(&inode->i_lock); 14031f018458STrond Myklebust /* drop the inode if we're reasonably sure this is the last link */ 140459a707b0STrond Myklebust if (inode->i_nlink > 0) 140559a707b0STrond Myklebust drop_nlink(inode); 140659a707b0STrond Myklebust NFS_I(inode)->attr_gencount = nfs_inc_attr_generation_counter(); 140716e14375STrond Myklebust NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE 140816e14375STrond Myklebust | NFS_INO_INVALID_CTIME 140959a707b0STrond Myklebust | NFS_INO_INVALID_OTHER 141059a707b0STrond Myklebust | NFS_INO_REVAL_FORCED; 14111b83d707STrond Myklebust spin_unlock(&inode->i_lock); 14121b83d707STrond Myklebust } 14131b83d707STrond Myklebust 14141da177e4SLinus Torvalds /* 14151da177e4SLinus Torvalds * Called when the dentry loses inode. 14161da177e4SLinus Torvalds * We use it to clean up silly-renamed files. 14171da177e4SLinus Torvalds */ 14181da177e4SLinus Torvalds static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) 14191da177e4SLinus Torvalds { 142083672d39SNeil Brown if (S_ISDIR(inode->i_mode)) 142183672d39SNeil Brown /* drop any readdir cache as it could easily be old */ 142283672d39SNeil Brown NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; 142383672d39SNeil Brown 14241da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { 1425e4eff1a6STrond Myklebust nfs_complete_unlink(dentry, inode); 14261f018458STrond Myklebust nfs_drop_nlink(inode); 14271da177e4SLinus Torvalds } 14281da177e4SLinus Torvalds iput(inode); 14291da177e4SLinus Torvalds } 14301da177e4SLinus Torvalds 1431b1942c5fSAl Viro static void nfs_d_release(struct dentry *dentry) 1432b1942c5fSAl Viro { 1433b1942c5fSAl Viro /* free cached devname value, if it survived that far */ 1434b1942c5fSAl Viro if (unlikely(dentry->d_fsdata)) { 1435b1942c5fSAl Viro if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 1436b1942c5fSAl Viro WARN_ON(1); 1437b1942c5fSAl Viro else 1438b1942c5fSAl Viro kfree(dentry->d_fsdata); 1439b1942c5fSAl Viro } 1440b1942c5fSAl Viro } 1441b1942c5fSAl Viro 1442f786aa90SAl Viro const struct dentry_operations nfs_dentry_operations = { 14431da177e4SLinus Torvalds .d_revalidate = nfs_lookup_revalidate, 1444ecf3d1f1SJeff Layton .d_weak_revalidate = nfs_weak_revalidate, 14451da177e4SLinus Torvalds .d_delete = nfs_dentry_delete, 14461da177e4SLinus Torvalds .d_iput = nfs_dentry_iput, 144736d43a43SDavid Howells .d_automount = nfs_d_automount, 1448b1942c5fSAl Viro .d_release = nfs_d_release, 14491da177e4SLinus Torvalds }; 1450ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_dentry_operations); 14511da177e4SLinus Torvalds 1452597d9289SBryan Schumaker struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) 14531da177e4SLinus Torvalds { 14541da177e4SLinus Torvalds struct dentry *res; 14551da177e4SLinus Torvalds struct inode *inode = NULL; 1456e1fb4d05STrond Myklebust struct nfs_fh *fhandle = NULL; 1457e1fb4d05STrond Myklebust struct nfs_fattr *fattr = NULL; 14581775fd3eSDavid Quigley struct nfs4_label *label = NULL; 14591da177e4SLinus Torvalds int error; 14601da177e4SLinus Torvalds 14616de1472fSAl Viro dfprintk(VFS, "NFS: lookup(%pd2)\n", dentry); 146291d5b470SChuck Lever nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); 14631da177e4SLinus Torvalds 1464130f9ab7SAl Viro if (unlikely(dentry->d_name.len > NFS_SERVER(dir)->namelen)) 1465130f9ab7SAl Viro return ERR_PTR(-ENAMETOOLONG); 14661da177e4SLinus Torvalds 1467fd684071STrond Myklebust /* 1468fd684071STrond Myklebust * If we're doing an exclusive create, optimize away the lookup 1469fd684071STrond Myklebust * but don't hash the dentry. 1470fd684071STrond Myklebust */ 14719f6d44d4STrond Myklebust if (nfs_is_exclusive_create(dir, flags) || flags & LOOKUP_RENAME_TARGET) 1472130f9ab7SAl Viro return NULL; 14731da177e4SLinus Torvalds 1474e1fb4d05STrond Myklebust res = ERR_PTR(-ENOMEM); 1475e1fb4d05STrond Myklebust fhandle = nfs_alloc_fhandle(); 1476e1fb4d05STrond Myklebust fattr = nfs_alloc_fattr(); 1477e1fb4d05STrond Myklebust if (fhandle == NULL || fattr == NULL) 1478e1fb4d05STrond Myklebust goto out; 1479e1fb4d05STrond Myklebust 148014c43f76SDavid Quigley label = nfs4_label_alloc(NFS_SERVER(dir), GFP_NOWAIT); 148114c43f76SDavid Quigley if (IS_ERR(label)) 148214c43f76SDavid Quigley goto out; 148314c43f76SDavid Quigley 14846e0d0be7STrond Myklebust trace_nfs_lookup_enter(dir, dentry, flags); 14851775fd3eSDavid Quigley error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); 14861da177e4SLinus Torvalds if (error == -ENOENT) 14871da177e4SLinus Torvalds goto no_entry; 14881da177e4SLinus Torvalds if (error < 0) { 14891da177e4SLinus Torvalds res = ERR_PTR(error); 1490bf130914SAl Viro goto out_label; 14911da177e4SLinus Torvalds } 14921775fd3eSDavid Quigley inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); 1493bf0c84f1SNamhyung Kim res = ERR_CAST(inode); 149403f28e3aSTrond Myklebust if (IS_ERR(res)) 1495bf130914SAl Viro goto out_label; 149654ceac45SDavid Howells 149763519fbcSTrond Myklebust /* Notify readdir to use READDIRPLUS */ 149863519fbcSTrond Myklebust nfs_force_use_readdirplus(dir); 1499d69ee9b8STrond Myklebust 15001da177e4SLinus Torvalds no_entry: 150141d28bcaSAl Viro res = d_splice_alias(inode, dentry); 15029eaef27bSTrond Myklebust if (res != NULL) { 15039eaef27bSTrond Myklebust if (IS_ERR(res)) 1504bf130914SAl Viro goto out_label; 15051da177e4SLinus Torvalds dentry = res; 15069eaef27bSTrond Myklebust } 15071da177e4SLinus Torvalds nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 1508bf130914SAl Viro out_label: 15096e0d0be7STrond Myklebust trace_nfs_lookup_exit(dir, dentry, flags, error); 151014c43f76SDavid Quigley nfs4_label_free(label); 15111da177e4SLinus Torvalds out: 1512e1fb4d05STrond Myklebust nfs_free_fattr(fattr); 1513e1fb4d05STrond Myklebust nfs_free_fhandle(fhandle); 15141da177e4SLinus Torvalds return res; 15151da177e4SLinus Torvalds } 1516ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_lookup); 15171da177e4SLinus Torvalds 151889d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V4) 15190b728e19SAl Viro static int nfs4_lookup_revalidate(struct dentry *, unsigned int); 15201da177e4SLinus Torvalds 1521f786aa90SAl Viro const struct dentry_operations nfs4_dentry_operations = { 15220ef97dcfSMiklos Szeredi .d_revalidate = nfs4_lookup_revalidate, 1523b688741cSNeilBrown .d_weak_revalidate = nfs_weak_revalidate, 15241da177e4SLinus Torvalds .d_delete = nfs_dentry_delete, 15251da177e4SLinus Torvalds .d_iput = nfs_dentry_iput, 152636d43a43SDavid Howells .d_automount = nfs_d_automount, 1527b1942c5fSAl Viro .d_release = nfs_d_release, 15281da177e4SLinus Torvalds }; 152989d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs4_dentry_operations); 15301da177e4SLinus Torvalds 15318a5e929dSAl Viro static fmode_t flags_to_mode(int flags) 15328a5e929dSAl Viro { 15338a5e929dSAl Viro fmode_t res = (__force fmode_t)flags & FMODE_EXEC; 15348a5e929dSAl Viro if ((flags & O_ACCMODE) != O_WRONLY) 15358a5e929dSAl Viro res |= FMODE_READ; 15368a5e929dSAl Viro if ((flags & O_ACCMODE) != O_RDONLY) 15378a5e929dSAl Viro res |= FMODE_WRITE; 15388a5e929dSAl Viro return res; 15398a5e929dSAl Viro } 15408a5e929dSAl Viro 1541532d4defSNeilBrown static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags, struct file *filp) 1542cd9a1c0eSTrond Myklebust { 1543532d4defSNeilBrown return alloc_nfs_open_context(dentry, flags_to_mode(open_flags), filp); 1544cd9a1c0eSTrond Myklebust } 1545cd9a1c0eSTrond Myklebust 1546cd9a1c0eSTrond Myklebust static int do_open(struct inode *inode, struct file *filp) 1547cd9a1c0eSTrond Myklebust { 1548f1fe29b4SDavid Howells nfs_fscache_open_file(inode, filp); 1549cd9a1c0eSTrond Myklebust return 0; 1550cd9a1c0eSTrond Myklebust } 1551cd9a1c0eSTrond Myklebust 1552d9585277SAl Viro static int nfs_finish_open(struct nfs_open_context *ctx, 15530dd2b474SMiklos Szeredi struct dentry *dentry, 1554b452a458SAl Viro struct file *file, unsigned open_flags) 1555cd9a1c0eSTrond Myklebust { 15560dd2b474SMiklos Szeredi int err; 15570dd2b474SMiklos Szeredi 1558be12af3eSAl Viro err = finish_open(file, dentry, do_open); 155930d90494SAl Viro if (err) 1560d9585277SAl Viro goto out; 1561eaa2b82cSNeilBrown if (S_ISREG(file->f_path.dentry->d_inode->i_mode)) 156230d90494SAl Viro nfs_file_set_open_context(file, ctx); 1563eaa2b82cSNeilBrown else 1564eaa2b82cSNeilBrown err = -ESTALE; 1565cd9a1c0eSTrond Myklebust out: 1566d9585277SAl Viro return err; 1567cd9a1c0eSTrond Myklebust } 1568cd9a1c0eSTrond Myklebust 156973a79706SBryan Schumaker int nfs_atomic_open(struct inode *dir, struct dentry *dentry, 157030d90494SAl Viro struct file *file, unsigned open_flags, 157144907d79SAl Viro umode_t mode) 15721da177e4SLinus Torvalds { 1573c94c0953SAl Viro DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); 1574cd9a1c0eSTrond Myklebust struct nfs_open_context *ctx; 15750dd2b474SMiklos Szeredi struct dentry *res; 15760dd2b474SMiklos Szeredi struct iattr attr = { .ia_valid = ATTR_OPEN }; 1577f46e0bd3STrond Myklebust struct inode *inode; 15781472b83eSTrond Myklebust unsigned int lookup_flags = 0; 1579c94c0953SAl Viro bool switched = false; 158073a09dd9SAl Viro int created = 0; 1581898f635cSTrond Myklebust int err; 15821da177e4SLinus Torvalds 15830dd2b474SMiklos Szeredi /* Expect a negative dentry */ 15842b0143b5SDavid Howells BUG_ON(d_inode(dentry)); 15850dd2b474SMiklos Szeredi 15861e8968c5SNiels de Vos dfprintk(VFS, "NFS: atomic_open(%s/%lu), %pd\n", 15876de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 15881e7cb3dcSChuck Lever 15899597c13bSJeff Layton err = nfs_check_flags(open_flags); 15909597c13bSJeff Layton if (err) 15919597c13bSJeff Layton return err; 15929597c13bSJeff Layton 15930dd2b474SMiklos Szeredi /* NFS only supports OPEN on regular files */ 15940dd2b474SMiklos Szeredi if ((open_flags & O_DIRECTORY)) { 159500699ad8SAl Viro if (!d_in_lookup(dentry)) { 15960dd2b474SMiklos Szeredi /* 15970dd2b474SMiklos Szeredi * Hashed negative dentry with O_DIRECTORY: dentry was 15980dd2b474SMiklos Szeredi * revalidated and is fine, no need to perform lookup 15990dd2b474SMiklos Szeredi * again 16000dd2b474SMiklos Szeredi */ 1601d9585277SAl Viro return -ENOENT; 16020dd2b474SMiklos Szeredi } 16031472b83eSTrond Myklebust lookup_flags = LOOKUP_OPEN|LOOKUP_DIRECTORY; 16041da177e4SLinus Torvalds goto no_open; 16051da177e4SLinus Torvalds } 16061da177e4SLinus Torvalds 16070dd2b474SMiklos Szeredi if (dentry->d_name.len > NFS_SERVER(dir)->namelen) 1608d9585277SAl Viro return -ENAMETOOLONG; 16091da177e4SLinus Torvalds 16100dd2b474SMiklos Szeredi if (open_flags & O_CREAT) { 1611dff25ddbSAndreas Gruenbacher struct nfs_server *server = NFS_SERVER(dir); 1612dff25ddbSAndreas Gruenbacher 1613dff25ddbSAndreas Gruenbacher if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 1614dff25ddbSAndreas Gruenbacher mode &= ~current_umask(); 1615dff25ddbSAndreas Gruenbacher 1616536e43d1STrond Myklebust attr.ia_valid |= ATTR_MODE; 1617dff25ddbSAndreas Gruenbacher attr.ia_mode = mode; 16180dd2b474SMiklos Szeredi } 1619536e43d1STrond Myklebust if (open_flags & O_TRUNC) { 1620536e43d1STrond Myklebust attr.ia_valid |= ATTR_SIZE; 1621536e43d1STrond Myklebust attr.ia_size = 0; 1622cd9a1c0eSTrond Myklebust } 1623cd9a1c0eSTrond Myklebust 1624c94c0953SAl Viro if (!(open_flags & O_CREAT) && !d_in_lookup(dentry)) { 1625c94c0953SAl Viro d_drop(dentry); 1626c94c0953SAl Viro switched = true; 1627c94c0953SAl Viro dentry = d_alloc_parallel(dentry->d_parent, 1628c94c0953SAl Viro &dentry->d_name, &wq); 1629c94c0953SAl Viro if (IS_ERR(dentry)) 1630c94c0953SAl Viro return PTR_ERR(dentry); 1631c94c0953SAl Viro if (unlikely(!d_in_lookup(dentry))) 1632c94c0953SAl Viro return finish_no_open(file, dentry); 1633c94c0953SAl Viro } 1634c94c0953SAl Viro 1635532d4defSNeilBrown ctx = create_nfs_open_context(dentry, open_flags, file); 16360dd2b474SMiklos Szeredi err = PTR_ERR(ctx); 16370dd2b474SMiklos Szeredi if (IS_ERR(ctx)) 1638d9585277SAl Viro goto out; 16390dd2b474SMiklos Szeredi 16406e0d0be7STrond Myklebust trace_nfs_atomic_open_enter(dir, ctx, open_flags); 164173a09dd9SAl Viro inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, &created); 164273a09dd9SAl Viro if (created) 164373a09dd9SAl Viro file->f_mode |= FMODE_CREATED; 1644275bb307STrond Myklebust if (IS_ERR(inode)) { 16450dd2b474SMiklos Szeredi err = PTR_ERR(inode); 16466e0d0be7STrond Myklebust trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); 16472d9db750STrond Myklebust put_nfs_open_context(ctx); 1648d20cb71dSAl Viro d_drop(dentry); 16490dd2b474SMiklos Szeredi switch (err) { 16501da177e4SLinus Torvalds case -ENOENT: 1651774d9513SPeng Tao d_splice_alias(NULL, dentry); 1652809fd143STrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 16530dd2b474SMiklos Szeredi break; 16541788ea6eSJeff Layton case -EISDIR: 16556f926b5bSTrond Myklebust case -ENOTDIR: 16566f926b5bSTrond Myklebust goto no_open; 16571da177e4SLinus Torvalds case -ELOOP: 16580dd2b474SMiklos Szeredi if (!(open_flags & O_NOFOLLOW)) 16591da177e4SLinus Torvalds goto no_open; 16600dd2b474SMiklos Szeredi break; 16611da177e4SLinus Torvalds /* case -EINVAL: */ 16621da177e4SLinus Torvalds default: 16630dd2b474SMiklos Szeredi break; 16641da177e4SLinus Torvalds } 16651da177e4SLinus Torvalds goto out; 16661da177e4SLinus Torvalds } 16670dd2b474SMiklos Szeredi 1668b452a458SAl Viro err = nfs_finish_open(ctx, ctx->dentry, file, open_flags); 16696e0d0be7STrond Myklebust trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); 16702d9db750STrond Myklebust put_nfs_open_context(ctx); 1671d9585277SAl Viro out: 1672c94c0953SAl Viro if (unlikely(switched)) { 1673c94c0953SAl Viro d_lookup_done(dentry); 1674c94c0953SAl Viro dput(dentry); 1675c94c0953SAl Viro } 1676d9585277SAl Viro return err; 16770dd2b474SMiklos Szeredi 16781da177e4SLinus Torvalds no_open: 16791472b83eSTrond Myklebust res = nfs_lookup(dir, dentry, lookup_flags); 1680c94c0953SAl Viro if (switched) { 1681c94c0953SAl Viro d_lookup_done(dentry); 1682c94c0953SAl Viro if (!res) 1683c94c0953SAl Viro res = dentry; 1684c94c0953SAl Viro else 1685c94c0953SAl Viro dput(dentry); 1686c94c0953SAl Viro } 16870dd2b474SMiklos Szeredi if (IS_ERR(res)) 1688c94c0953SAl Viro return PTR_ERR(res); 1689e45198a6SAl Viro return finish_no_open(file, res); 16901da177e4SLinus Torvalds } 169189d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_atomic_open); 16921da177e4SLinus Torvalds 1693c7944ebbSTrond Myklebust static int 1694c7944ebbSTrond Myklebust nfs4_do_lookup_revalidate(struct inode *dir, struct dentry *dentry, 1695c7944ebbSTrond Myklebust unsigned int flags) 16961da177e4SLinus Torvalds { 1697657e94b6SNick Piggin struct inode *inode; 16981da177e4SLinus Torvalds 1699fa3c56bbSAl Viro if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) 1700c7944ebbSTrond Myklebust goto full_reval; 1701eda72afbSMiklos Szeredi if (d_mountpoint(dentry)) 1702c7944ebbSTrond Myklebust goto full_reval; 17032b484297STrond Myklebust 17042b0143b5SDavid Howells inode = d_inode(dentry); 17052b484297STrond Myklebust 17061da177e4SLinus Torvalds /* We can't create new files in nfs_open_revalidate(), so we 17071da177e4SLinus Torvalds * optimize away revalidation of negative dentries. 17081da177e4SLinus Torvalds */ 1709c7944ebbSTrond Myklebust if (inode == NULL) 1710c7944ebbSTrond Myklebust goto full_reval; 171149317a7fSNeilBrown 1712c7944ebbSTrond Myklebust if (NFS_PROTO(dir)->have_delegation(inode, FMODE_READ)) 1713c7944ebbSTrond Myklebust return nfs_lookup_revalidate_delegated(dir, dentry, inode); 1714216d5d06STrond Myklebust 17151da177e4SLinus Torvalds /* NFS only supports OPEN on regular files */ 17161da177e4SLinus Torvalds if (!S_ISREG(inode->i_mode)) 1717c7944ebbSTrond Myklebust goto full_reval; 1718c7944ebbSTrond Myklebust 17191da177e4SLinus Torvalds /* We cannot do exclusive creation on a positive dentry */ 1720c7944ebbSTrond Myklebust if (flags & (LOOKUP_EXCL | LOOKUP_REVAL)) 1721c7944ebbSTrond Myklebust goto reval_dentry; 1722c7944ebbSTrond Myklebust 1723c7944ebbSTrond Myklebust /* Check if the directory changed */ 1724c7944ebbSTrond Myklebust if (!nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) 1725c7944ebbSTrond Myklebust goto reval_dentry; 17261da177e4SLinus Torvalds 17270ef97dcfSMiklos Szeredi /* Let f_op->open() actually open (and revalidate) the file */ 1728c7944ebbSTrond Myklebust return 1; 1729c7944ebbSTrond Myklebust reval_dentry: 1730c7944ebbSTrond Myklebust if (flags & LOOKUP_RCU) 1731c7944ebbSTrond Myklebust return -ECHILD; 173242f72cf3Szhangliguang return nfs_lookup_revalidate_dentry(dir, dentry, inode); 17330ef97dcfSMiklos Szeredi 1734c7944ebbSTrond Myklebust full_reval: 1735c7944ebbSTrond Myklebust return nfs_do_lookup_revalidate(dir, dentry, flags); 1736c7944ebbSTrond Myklebust } 1737535918f1STrond Myklebust 1738c7944ebbSTrond Myklebust static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) 1739c7944ebbSTrond Myklebust { 1740c7944ebbSTrond Myklebust return __nfs_lookup_revalidate(dentry, flags, 1741c7944ebbSTrond Myklebust nfs4_do_lookup_revalidate); 1742c0204fd2STrond Myklebust } 1743c0204fd2STrond Myklebust 17441da177e4SLinus Torvalds #endif /* CONFIG_NFSV4 */ 17451da177e4SLinus Torvalds 17461da177e4SLinus Torvalds /* 17471da177e4SLinus Torvalds * Code common to create, mkdir, and mknod. 17481da177e4SLinus Torvalds */ 17491da177e4SLinus Torvalds int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, 17501775fd3eSDavid Quigley struct nfs_fattr *fattr, 17511775fd3eSDavid Quigley struct nfs4_label *label) 17521da177e4SLinus Torvalds { 1753fab728e1STrond Myklebust struct dentry *parent = dget_parent(dentry); 17542b0143b5SDavid Howells struct inode *dir = d_inode(parent); 17551da177e4SLinus Torvalds struct inode *inode; 1756b0c6108eSAl Viro struct dentry *d; 17571da177e4SLinus Torvalds int error = -EACCES; 17581da177e4SLinus Torvalds 1759fab728e1STrond Myklebust d_drop(dentry); 1760fab728e1STrond Myklebust 17611da177e4SLinus Torvalds /* We may have been initialized further down */ 17622b0143b5SDavid Howells if (d_really_is_positive(dentry)) 1763fab728e1STrond Myklebust goto out; 17641da177e4SLinus Torvalds if (fhandle->size == 0) { 17651775fd3eSDavid Quigley error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, NULL); 17661da177e4SLinus Torvalds if (error) 1767fab728e1STrond Myklebust goto out_error; 17681da177e4SLinus Torvalds } 17695724ab37STrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 17701da177e4SLinus Torvalds if (!(fattr->valid & NFS_ATTR_FATTR)) { 17711da177e4SLinus Torvalds struct nfs_server *server = NFS_SB(dentry->d_sb); 1772a841b54dSTrond Myklebust error = server->nfs_client->rpc_ops->getattr(server, fhandle, 1773a841b54dSTrond Myklebust fattr, NULL, NULL); 17741da177e4SLinus Torvalds if (error < 0) 1775fab728e1STrond Myklebust goto out_error; 17761da177e4SLinus Torvalds } 17771775fd3eSDavid Quigley inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); 1778b0c6108eSAl Viro d = d_splice_alias(inode, dentry); 1779b0c6108eSAl Viro if (IS_ERR(d)) { 1780b0c6108eSAl Viro error = PTR_ERR(d); 1781fab728e1STrond Myklebust goto out_error; 1782b0c6108eSAl Viro } 1783b0c6108eSAl Viro dput(d); 1784fab728e1STrond Myklebust out: 1785fab728e1STrond Myklebust dput(parent); 17861da177e4SLinus Torvalds return 0; 1787fab728e1STrond Myklebust out_error: 1788fab728e1STrond Myklebust nfs_mark_for_revalidate(dir); 1789fab728e1STrond Myklebust dput(parent); 1790fab728e1STrond Myklebust return error; 17911da177e4SLinus Torvalds } 1792ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_instantiate); 17931da177e4SLinus Torvalds 17941da177e4SLinus Torvalds /* 17951da177e4SLinus Torvalds * Following a failed create operation, we drop the dentry rather 17961da177e4SLinus Torvalds * than retain a negative dentry. This avoids a problem in the event 17971da177e4SLinus Torvalds * that the operation succeeded on the server, but an error in the 17981da177e4SLinus Torvalds * reply path made it appear to have failed. 17991da177e4SLinus Torvalds */ 1800597d9289SBryan Schumaker int nfs_create(struct inode *dir, struct dentry *dentry, 1801ebfc3b49SAl Viro umode_t mode, bool excl) 18021da177e4SLinus Torvalds { 18031da177e4SLinus Torvalds struct iattr attr; 1804ebfc3b49SAl Viro int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; 18051da177e4SLinus Torvalds int error; 18061da177e4SLinus Torvalds 18071e8968c5SNiels de Vos dfprintk(VFS, "NFS: create(%s/%lu), %pd\n", 18086de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 18091da177e4SLinus Torvalds 18101da177e4SLinus Torvalds attr.ia_mode = mode; 18111da177e4SLinus Torvalds attr.ia_valid = ATTR_MODE; 18121da177e4SLinus Torvalds 18138b0ad3d4STrond Myklebust trace_nfs_create_enter(dir, dentry, open_flags); 18148867fe58SMiklos Szeredi error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); 18158b0ad3d4STrond Myklebust trace_nfs_create_exit(dir, dentry, open_flags, error); 18161da177e4SLinus Torvalds if (error != 0) 18171da177e4SLinus Torvalds goto out_err; 18181da177e4SLinus Torvalds return 0; 18191da177e4SLinus Torvalds out_err: 18201da177e4SLinus Torvalds d_drop(dentry); 18211da177e4SLinus Torvalds return error; 18221da177e4SLinus Torvalds } 1823ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_create); 18241da177e4SLinus Torvalds 18251da177e4SLinus Torvalds /* 18261da177e4SLinus Torvalds * See comments for nfs_proc_create regarding failed operations. 18271da177e4SLinus Torvalds */ 1828597d9289SBryan Schumaker int 18291a67aafbSAl Viro nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 18301da177e4SLinus Torvalds { 18311da177e4SLinus Torvalds struct iattr attr; 18321da177e4SLinus Torvalds int status; 18331da177e4SLinus Torvalds 18341e8968c5SNiels de Vos dfprintk(VFS, "NFS: mknod(%s/%lu), %pd\n", 18356de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 18361da177e4SLinus Torvalds 18371da177e4SLinus Torvalds attr.ia_mode = mode; 18381da177e4SLinus Torvalds attr.ia_valid = ATTR_MODE; 18391da177e4SLinus Torvalds 18401ca42382STrond Myklebust trace_nfs_mknod_enter(dir, dentry); 18411da177e4SLinus Torvalds status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); 18421ca42382STrond Myklebust trace_nfs_mknod_exit(dir, dentry, status); 18431da177e4SLinus Torvalds if (status != 0) 18441da177e4SLinus Torvalds goto out_err; 18451da177e4SLinus Torvalds return 0; 18461da177e4SLinus Torvalds out_err: 18471da177e4SLinus Torvalds d_drop(dentry); 18481da177e4SLinus Torvalds return status; 18491da177e4SLinus Torvalds } 1850ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_mknod); 18511da177e4SLinus Torvalds 18521da177e4SLinus Torvalds /* 18531da177e4SLinus Torvalds * See comments for nfs_proc_create regarding failed operations. 18541da177e4SLinus Torvalds */ 1855597d9289SBryan Schumaker int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 18561da177e4SLinus Torvalds { 18571da177e4SLinus Torvalds struct iattr attr; 18581da177e4SLinus Torvalds int error; 18591da177e4SLinus Torvalds 18601e8968c5SNiels de Vos dfprintk(VFS, "NFS: mkdir(%s/%lu), %pd\n", 18616de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 18621da177e4SLinus Torvalds 18631da177e4SLinus Torvalds attr.ia_valid = ATTR_MODE; 18641da177e4SLinus Torvalds attr.ia_mode = mode | S_IFDIR; 18651da177e4SLinus Torvalds 18661ca42382STrond Myklebust trace_nfs_mkdir_enter(dir, dentry); 18671da177e4SLinus Torvalds error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); 18681ca42382STrond Myklebust trace_nfs_mkdir_exit(dir, dentry, error); 18691da177e4SLinus Torvalds if (error != 0) 18701da177e4SLinus Torvalds goto out_err; 18711da177e4SLinus Torvalds return 0; 18721da177e4SLinus Torvalds out_err: 18731da177e4SLinus Torvalds d_drop(dentry); 18741da177e4SLinus Torvalds return error; 18751da177e4SLinus Torvalds } 1876ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_mkdir); 18771da177e4SLinus Torvalds 1878d45b9d8bSTrond Myklebust static void nfs_dentry_handle_enoent(struct dentry *dentry) 1879d45b9d8bSTrond Myklebust { 1880dc3f4198SAl Viro if (simple_positive(dentry)) 1881d45b9d8bSTrond Myklebust d_delete(dentry); 1882d45b9d8bSTrond Myklebust } 1883d45b9d8bSTrond Myklebust 1884597d9289SBryan Schumaker int nfs_rmdir(struct inode *dir, struct dentry *dentry) 18851da177e4SLinus Torvalds { 18861da177e4SLinus Torvalds int error; 18871da177e4SLinus Torvalds 18881e8968c5SNiels de Vos dfprintk(VFS, "NFS: rmdir(%s/%lu), %pd\n", 18896de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 18901da177e4SLinus Torvalds 18911ca42382STrond Myklebust trace_nfs_rmdir_enter(dir, dentry); 18922b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 1893884be175SAl Viro down_write(&NFS_I(d_inode(dentry))->rmdir_sem); 18941da177e4SLinus Torvalds error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); 18951da177e4SLinus Torvalds /* Ensure the VFS deletes this inode */ 1896ba6c0592STrond Myklebust switch (error) { 1897ba6c0592STrond Myklebust case 0: 18982b0143b5SDavid Howells clear_nlink(d_inode(dentry)); 1899ba6c0592STrond Myklebust break; 1900ba6c0592STrond Myklebust case -ENOENT: 1901d45b9d8bSTrond Myklebust nfs_dentry_handle_enoent(dentry); 1902ba6c0592STrond Myklebust } 1903884be175SAl Viro up_write(&NFS_I(d_inode(dentry))->rmdir_sem); 1904ba6c0592STrond Myklebust } else 1905ba6c0592STrond Myklebust error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); 19061ca42382STrond Myklebust trace_nfs_rmdir_exit(dir, dentry, error); 19071da177e4SLinus Torvalds 19081da177e4SLinus Torvalds return error; 19091da177e4SLinus Torvalds } 1910ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_rmdir); 19111da177e4SLinus Torvalds 19121da177e4SLinus Torvalds /* 19131da177e4SLinus Torvalds * Remove a file after making sure there are no pending writes, 19141da177e4SLinus Torvalds * and after checking that the file has only one user. 19151da177e4SLinus Torvalds * 19161da177e4SLinus Torvalds * We invalidate the attribute cache and free the inode prior to the operation 19171da177e4SLinus Torvalds * to avoid possible races if the server reuses the inode. 19181da177e4SLinus Torvalds */ 19191da177e4SLinus Torvalds static int nfs_safe_remove(struct dentry *dentry) 19201da177e4SLinus Torvalds { 19212b0143b5SDavid Howells struct inode *dir = d_inode(dentry->d_parent); 19222b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 19231da177e4SLinus Torvalds int error = -EBUSY; 19241da177e4SLinus Torvalds 19256de1472fSAl Viro dfprintk(VFS, "NFS: safe_remove(%pd2)\n", dentry); 19261da177e4SLinus Torvalds 19271da177e4SLinus Torvalds /* If the dentry was sillyrenamed, we simply call d_delete() */ 19281da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { 19291da177e4SLinus Torvalds error = 0; 19301da177e4SLinus Torvalds goto out; 19311da177e4SLinus Torvalds } 19321da177e4SLinus Torvalds 19331ca42382STrond Myklebust trace_nfs_remove_enter(dir, dentry); 19341da177e4SLinus Torvalds if (inode != NULL) { 1935912678dbSTrond Myklebust error = NFS_PROTO(dir)->remove(dir, dentry); 19361da177e4SLinus Torvalds if (error == 0) 19371b83d707STrond Myklebust nfs_drop_nlink(inode); 19381da177e4SLinus Torvalds } else 1939912678dbSTrond Myklebust error = NFS_PROTO(dir)->remove(dir, dentry); 1940d45b9d8bSTrond Myklebust if (error == -ENOENT) 1941d45b9d8bSTrond Myklebust nfs_dentry_handle_enoent(dentry); 19421ca42382STrond Myklebust trace_nfs_remove_exit(dir, dentry, error); 19431da177e4SLinus Torvalds out: 19441da177e4SLinus Torvalds return error; 19451da177e4SLinus Torvalds } 19461da177e4SLinus Torvalds 19471da177e4SLinus Torvalds /* We do silly rename. In case sillyrename() returns -EBUSY, the inode 19481da177e4SLinus Torvalds * belongs to an active ".nfs..." file and we return -EBUSY. 19491da177e4SLinus Torvalds * 19501da177e4SLinus Torvalds * If sillyrename() returns 0, we do nothing, otherwise we unlink. 19511da177e4SLinus Torvalds */ 1952597d9289SBryan Schumaker int nfs_unlink(struct inode *dir, struct dentry *dentry) 19531da177e4SLinus Torvalds { 19541da177e4SLinus Torvalds int error; 19551da177e4SLinus Torvalds int need_rehash = 0; 19561da177e4SLinus Torvalds 19571e8968c5SNiels de Vos dfprintk(VFS, "NFS: unlink(%s/%lu, %pd)\n", dir->i_sb->s_id, 19586de1472fSAl Viro dir->i_ino, dentry); 19591da177e4SLinus Torvalds 19601ca42382STrond Myklebust trace_nfs_unlink_enter(dir, dentry); 19611da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 196284d08fa8SAl Viro if (d_count(dentry) > 1) { 19631da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 1964ccfeb506STrond Myklebust /* Start asynchronous writeout of the inode */ 19652b0143b5SDavid Howells write_inode_now(d_inode(dentry), 0); 19661da177e4SLinus Torvalds error = nfs_sillyrename(dir, dentry); 19671ca42382STrond Myklebust goto out; 19681da177e4SLinus Torvalds } 19691da177e4SLinus Torvalds if (!d_unhashed(dentry)) { 19701da177e4SLinus Torvalds __d_drop(dentry); 19711da177e4SLinus Torvalds need_rehash = 1; 19721da177e4SLinus Torvalds } 19731da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 19741da177e4SLinus Torvalds error = nfs_safe_remove(dentry); 1975d45b9d8bSTrond Myklebust if (!error || error == -ENOENT) { 19761da177e4SLinus Torvalds nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 19771da177e4SLinus Torvalds } else if (need_rehash) 19781da177e4SLinus Torvalds d_rehash(dentry); 19791ca42382STrond Myklebust out: 19801ca42382STrond Myklebust trace_nfs_unlink_exit(dir, dentry, error); 19811da177e4SLinus Torvalds return error; 19821da177e4SLinus Torvalds } 1983ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_unlink); 19841da177e4SLinus Torvalds 1985873101b3SChuck Lever /* 1986873101b3SChuck Lever * To create a symbolic link, most file systems instantiate a new inode, 1987873101b3SChuck Lever * add a page to it containing the path, then write it out to the disk 1988873101b3SChuck Lever * using prepare_write/commit_write. 1989873101b3SChuck Lever * 1990873101b3SChuck Lever * Unfortunately the NFS client can't create the in-core inode first 1991873101b3SChuck Lever * because it needs a file handle to create an in-core inode (see 1992873101b3SChuck Lever * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the 1993873101b3SChuck Lever * symlink request has completed on the server. 1994873101b3SChuck Lever * 1995873101b3SChuck Lever * So instead we allocate a raw page, copy the symname into it, then do 1996873101b3SChuck Lever * the SYMLINK request with the page as the buffer. If it succeeds, we 1997873101b3SChuck Lever * now have a new file handle and can instantiate an in-core NFS inode 1998873101b3SChuck Lever * and move the raw page into its mapping. 1999873101b3SChuck Lever */ 2000597d9289SBryan Schumaker int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 20011da177e4SLinus Torvalds { 2002873101b3SChuck Lever struct page *page; 2003873101b3SChuck Lever char *kaddr; 20041da177e4SLinus Torvalds struct iattr attr; 2005873101b3SChuck Lever unsigned int pathlen = strlen(symname); 20061da177e4SLinus Torvalds int error; 20071da177e4SLinus Torvalds 20081e8968c5SNiels de Vos dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s)\n", dir->i_sb->s_id, 20096de1472fSAl Viro dir->i_ino, dentry, symname); 20101da177e4SLinus Torvalds 2011873101b3SChuck Lever if (pathlen > PAGE_SIZE) 2012873101b3SChuck Lever return -ENAMETOOLONG; 20131da177e4SLinus Torvalds 2014873101b3SChuck Lever attr.ia_mode = S_IFLNK | S_IRWXUGO; 2015873101b3SChuck Lever attr.ia_valid = ATTR_MODE; 20161da177e4SLinus Torvalds 2017e8ecde25SAl Viro page = alloc_page(GFP_USER); 201876566991STrond Myklebust if (!page) 2019873101b3SChuck Lever return -ENOMEM; 2020873101b3SChuck Lever 2021e8ecde25SAl Viro kaddr = page_address(page); 2022873101b3SChuck Lever memcpy(kaddr, symname, pathlen); 2023873101b3SChuck Lever if (pathlen < PAGE_SIZE) 2024873101b3SChuck Lever memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); 2025873101b3SChuck Lever 20261ca42382STrond Myklebust trace_nfs_symlink_enter(dir, dentry); 202794a6d753SChuck Lever error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); 20281ca42382STrond Myklebust trace_nfs_symlink_exit(dir, dentry, error); 2029873101b3SChuck Lever if (error != 0) { 20301e8968c5SNiels de Vos dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s) error %d\n", 2031873101b3SChuck Lever dir->i_sb->s_id, dir->i_ino, 20326de1472fSAl Viro dentry, symname, error); 20331da177e4SLinus Torvalds d_drop(dentry); 2034873101b3SChuck Lever __free_page(page); 20351da177e4SLinus Torvalds return error; 20361da177e4SLinus Torvalds } 20371da177e4SLinus Torvalds 2038873101b3SChuck Lever /* 2039873101b3SChuck Lever * No big deal if we can't add this page to the page cache here. 2040873101b3SChuck Lever * READLINK will get the missing page from the server if needed. 2041873101b3SChuck Lever */ 20422b0143b5SDavid Howells if (!add_to_page_cache_lru(page, d_inode(dentry)->i_mapping, 0, 2043873101b3SChuck Lever GFP_KERNEL)) { 2044873101b3SChuck Lever SetPageUptodate(page); 2045873101b3SChuck Lever unlock_page(page); 2046a0b54addSRafael Aquini /* 2047a0b54addSRafael Aquini * add_to_page_cache_lru() grabs an extra page refcount. 2048a0b54addSRafael Aquini * Drop it here to avoid leaking this page later. 2049a0b54addSRafael Aquini */ 205009cbfeafSKirill A. Shutemov put_page(page); 2051873101b3SChuck Lever } else 2052873101b3SChuck Lever __free_page(page); 2053873101b3SChuck Lever 2054873101b3SChuck Lever return 0; 2055873101b3SChuck Lever } 2056ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_symlink); 2057873101b3SChuck Lever 2058597d9289SBryan Schumaker int 20591da177e4SLinus Torvalds nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) 20601da177e4SLinus Torvalds { 20612b0143b5SDavid Howells struct inode *inode = d_inode(old_dentry); 20621da177e4SLinus Torvalds int error; 20631da177e4SLinus Torvalds 20646de1472fSAl Viro dfprintk(VFS, "NFS: link(%pd2 -> %pd2)\n", 20656de1472fSAl Viro old_dentry, dentry); 20661da177e4SLinus Torvalds 20671fd1085bSTrond Myklebust trace_nfs_link_enter(inode, dir, dentry); 20689697d234STrond Myklebust d_drop(dentry); 20691da177e4SLinus Torvalds error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); 2070cf809556STrond Myklebust if (error == 0) { 20717de9c6eeSAl Viro ihold(inode); 20729697d234STrond Myklebust d_add(dentry, inode); 2073cf809556STrond Myklebust } 20741fd1085bSTrond Myklebust trace_nfs_link_exit(inode, dir, dentry, error); 20751da177e4SLinus Torvalds return error; 20761da177e4SLinus Torvalds } 2077ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_link); 20781da177e4SLinus Torvalds 20791da177e4SLinus Torvalds /* 20801da177e4SLinus Torvalds * RENAME 20811da177e4SLinus Torvalds * FIXME: Some nfsds, like the Linux user space nfsd, may generate a 20821da177e4SLinus Torvalds * different file handle for the same inode after a rename (e.g. when 20831da177e4SLinus Torvalds * moving to a different directory). A fail-safe method to do so would 20841da177e4SLinus Torvalds * be to look up old_dir/old_name, create a link to new_dir/new_name and 20851da177e4SLinus Torvalds * rename the old file using the sillyrename stuff. This way, the original 20861da177e4SLinus Torvalds * file in old_dir will go away when the last process iput()s the inode. 20871da177e4SLinus Torvalds * 20881da177e4SLinus Torvalds * FIXED. 20891da177e4SLinus Torvalds * 20901da177e4SLinus Torvalds * It actually works quite well. One needs to have the possibility for 20911da177e4SLinus Torvalds * at least one ".nfs..." file in each directory the file ever gets 20921da177e4SLinus Torvalds * moved or linked to which happens automagically with the new 20931da177e4SLinus Torvalds * implementation that only depends on the dcache stuff instead of 20941da177e4SLinus Torvalds * using the inode layer 20951da177e4SLinus Torvalds * 20961da177e4SLinus Torvalds * Unfortunately, things are a little more complicated than indicated 20971da177e4SLinus Torvalds * above. For a cross-directory move, we want to make sure we can get 20981da177e4SLinus Torvalds * rid of the old inode after the operation. This means there must be 20991da177e4SLinus Torvalds * no pending writes (if it's a file), and the use count must be 1. 21001da177e4SLinus Torvalds * If these conditions are met, we can drop the dentries before doing 21011da177e4SLinus Torvalds * the rename. 21021da177e4SLinus Torvalds */ 2103597d9289SBryan Schumaker int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, 21041cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 21051cd66c93SMiklos Szeredi unsigned int flags) 21061da177e4SLinus Torvalds { 21072b0143b5SDavid Howells struct inode *old_inode = d_inode(old_dentry); 21082b0143b5SDavid Howells struct inode *new_inode = d_inode(new_dentry); 2109d9f29500SBenjamin Coddington struct dentry *dentry = NULL, *rehash = NULL; 211080a491fdSJeff Layton struct rpc_task *task; 21111da177e4SLinus Torvalds int error = -EBUSY; 21121da177e4SLinus Torvalds 21131cd66c93SMiklos Szeredi if (flags) 21141cd66c93SMiklos Szeredi return -EINVAL; 21151cd66c93SMiklos Szeredi 21166de1472fSAl Viro dfprintk(VFS, "NFS: rename(%pd2 -> %pd2, ct=%d)\n", 21176de1472fSAl Viro old_dentry, new_dentry, 211884d08fa8SAl Viro d_count(new_dentry)); 21191da177e4SLinus Torvalds 212070ded201STrond Myklebust trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry); 21211da177e4SLinus Torvalds /* 212228f79a1aSMiklos Szeredi * For non-directories, check whether the target is busy and if so, 212328f79a1aSMiklos Szeredi * make a copy of the dentry and then do a silly-rename. If the 212428f79a1aSMiklos Szeredi * silly-rename succeeds, the copied dentry is hashed and becomes 212528f79a1aSMiklos Szeredi * the new target. 21261da177e4SLinus Torvalds */ 212727226104SMiklos Szeredi if (new_inode && !S_ISDIR(new_inode->i_mode)) { 212827226104SMiklos Szeredi /* 212927226104SMiklos Szeredi * To prevent any new references to the target during the 213027226104SMiklos Szeredi * rename, we unhash the dentry in advance. 213127226104SMiklos Szeredi */ 2132d9f29500SBenjamin Coddington if (!d_unhashed(new_dentry)) { 213327226104SMiklos Szeredi d_drop(new_dentry); 2134d9f29500SBenjamin Coddington rehash = new_dentry; 2135d9f29500SBenjamin Coddington } 213627226104SMiklos Szeredi 213784d08fa8SAl Viro if (d_count(new_dentry) > 2) { 21381da177e4SLinus Torvalds int err; 213927226104SMiklos Szeredi 21401da177e4SLinus Torvalds /* copy the target dentry's name */ 21411da177e4SLinus Torvalds dentry = d_alloc(new_dentry->d_parent, 21421da177e4SLinus Torvalds &new_dentry->d_name); 21431da177e4SLinus Torvalds if (!dentry) 21441da177e4SLinus Torvalds goto out; 21451da177e4SLinus Torvalds 21461da177e4SLinus Torvalds /* silly-rename the existing target ... */ 21471da177e4SLinus Torvalds err = nfs_sillyrename(new_dir, new_dentry); 214824e93025SMiklos Szeredi if (err) 21491da177e4SLinus Torvalds goto out; 215024e93025SMiklos Szeredi 215124e93025SMiklos Szeredi new_dentry = dentry; 2152d9f29500SBenjamin Coddington rehash = NULL; 215324e93025SMiklos Szeredi new_inode = NULL; 2154b1e4adf4STrond Myklebust } 215527226104SMiklos Szeredi } 21561da177e4SLinus Torvalds 2157d9f29500SBenjamin Coddington task = nfs_async_rename(old_dir, new_dir, old_dentry, new_dentry, NULL); 215880a491fdSJeff Layton if (IS_ERR(task)) { 215980a491fdSJeff Layton error = PTR_ERR(task); 216080a491fdSJeff Layton goto out; 216180a491fdSJeff Layton } 216280a491fdSJeff Layton 216380a491fdSJeff Layton error = rpc_wait_for_completion_task(task); 2164818a8dbeSBenjamin Coddington if (error != 0) { 2165818a8dbeSBenjamin Coddington ((struct nfs_renamedata *)task->tk_calldata)->cancelled = 1; 2166818a8dbeSBenjamin Coddington /* Paired with the atomic_dec_and_test() barrier in rpc_do_put_task() */ 2167818a8dbeSBenjamin Coddington smp_wmb(); 2168818a8dbeSBenjamin Coddington } else 216980a491fdSJeff Layton error = task->tk_status; 217080a491fdSJeff Layton rpc_put_task(task); 217159a707b0STrond Myklebust /* Ensure the inode attributes are revalidated */ 217259a707b0STrond Myklebust if (error == 0) { 217359a707b0STrond Myklebust spin_lock(&old_inode->i_lock); 217459a707b0STrond Myklebust NFS_I(old_inode)->attr_gencount = nfs_inc_attr_generation_counter(); 217559a707b0STrond Myklebust NFS_I(old_inode)->cache_validity |= NFS_INO_INVALID_CHANGE 217659a707b0STrond Myklebust | NFS_INO_INVALID_CTIME 217759a707b0STrond Myklebust | NFS_INO_REVAL_FORCED; 217859a707b0STrond Myklebust spin_unlock(&old_inode->i_lock); 217959a707b0STrond Myklebust } 21801da177e4SLinus Torvalds out: 2181d9f29500SBenjamin Coddington if (rehash) 2182d9f29500SBenjamin Coddington d_rehash(rehash); 218370ded201STrond Myklebust trace_nfs_rename_exit(old_dir, old_dentry, 218470ded201STrond Myklebust new_dir, new_dentry, error); 2185d9f29500SBenjamin Coddington if (!error) { 2186d9f29500SBenjamin Coddington if (new_inode != NULL) 2187d9f29500SBenjamin Coddington nfs_drop_nlink(new_inode); 2188d9f29500SBenjamin Coddington /* 2189d9f29500SBenjamin Coddington * The d_move() should be here instead of in an async RPC completion 2190d9f29500SBenjamin Coddington * handler because we need the proper locks to move the dentry. If 2191d9f29500SBenjamin Coddington * we're interrupted by a signal, the async RPC completion handler 2192d9f29500SBenjamin Coddington * should mark the directories for revalidation. 2193d9f29500SBenjamin Coddington */ 2194d9f29500SBenjamin Coddington d_move(old_dentry, new_dentry); 2195d803224cSTrond Myklebust nfs_set_verifier(old_dentry, 2196d9f29500SBenjamin Coddington nfs_save_change_attribute(new_dir)); 2197d9f29500SBenjamin Coddington } else if (error == -ENOENT) 2198d9f29500SBenjamin Coddington nfs_dentry_handle_enoent(old_dentry); 2199d9f29500SBenjamin Coddington 22001da177e4SLinus Torvalds /* new dentry created? */ 22011da177e4SLinus Torvalds if (dentry) 22021da177e4SLinus Torvalds dput(dentry); 22031da177e4SLinus Torvalds return error; 22041da177e4SLinus Torvalds } 2205ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_rename); 22061da177e4SLinus Torvalds 2207cfcea3e8STrond Myklebust static DEFINE_SPINLOCK(nfs_access_lru_lock); 2208cfcea3e8STrond Myklebust static LIST_HEAD(nfs_access_lru_list); 2209cfcea3e8STrond Myklebust static atomic_long_t nfs_access_nr_entries; 2210cfcea3e8STrond Myklebust 22113a505845STrond Myklebust static unsigned long nfs_access_max_cachesize = ULONG_MAX; 22123a505845STrond Myklebust module_param(nfs_access_max_cachesize, ulong, 0644); 22133a505845STrond Myklebust MODULE_PARM_DESC(nfs_access_max_cachesize, "NFS access maximum total cache length"); 22143a505845STrond Myklebust 22151c3c07e9STrond Myklebust static void nfs_access_free_entry(struct nfs_access_entry *entry) 22161c3c07e9STrond Myklebust { 2217b68572e0SNeilBrown put_cred(entry->cred); 2218f682a398SNeilBrown kfree_rcu(entry, rcu_head); 22194e857c58SPeter Zijlstra smp_mb__before_atomic(); 2220cfcea3e8STrond Myklebust atomic_long_dec(&nfs_access_nr_entries); 22214e857c58SPeter Zijlstra smp_mb__after_atomic(); 22221c3c07e9STrond Myklebust } 22231c3c07e9STrond Myklebust 22241a81bb8aSTrond Myklebust static void nfs_access_free_list(struct list_head *head) 22251a81bb8aSTrond Myklebust { 22261a81bb8aSTrond Myklebust struct nfs_access_entry *cache; 22271a81bb8aSTrond Myklebust 22281a81bb8aSTrond Myklebust while (!list_empty(head)) { 22291a81bb8aSTrond Myklebust cache = list_entry(head->next, struct nfs_access_entry, lru); 22301a81bb8aSTrond Myklebust list_del(&cache->lru); 22311a81bb8aSTrond Myklebust nfs_access_free_entry(cache); 22321a81bb8aSTrond Myklebust } 22331a81bb8aSTrond Myklebust } 22341a81bb8aSTrond Myklebust 22353a505845STrond Myklebust static unsigned long 22363a505845STrond Myklebust nfs_do_access_cache_scan(unsigned int nr_to_scan) 2237979df72eSTrond Myklebust { 2238979df72eSTrond Myklebust LIST_HEAD(head); 2239aa510da5STrond Myklebust struct nfs_inode *nfsi, *next; 2240979df72eSTrond Myklebust struct nfs_access_entry *cache; 22411ab6c499SDave Chinner long freed = 0; 2242979df72eSTrond Myklebust 2243a50f7951STrond Myklebust spin_lock(&nfs_access_lru_lock); 2244aa510da5STrond Myklebust list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { 2245979df72eSTrond Myklebust struct inode *inode; 2246979df72eSTrond Myklebust 2247979df72eSTrond Myklebust if (nr_to_scan-- == 0) 2248979df72eSTrond Myklebust break; 22499c7e7e23STrond Myklebust inode = &nfsi->vfs_inode; 2250979df72eSTrond Myklebust spin_lock(&inode->i_lock); 2251979df72eSTrond Myklebust if (list_empty(&nfsi->access_cache_entry_lru)) 2252979df72eSTrond Myklebust goto remove_lru_entry; 2253979df72eSTrond Myklebust cache = list_entry(nfsi->access_cache_entry_lru.next, 2254979df72eSTrond Myklebust struct nfs_access_entry, lru); 2255979df72eSTrond Myklebust list_move(&cache->lru, &head); 2256979df72eSTrond Myklebust rb_erase(&cache->rb_node, &nfsi->access_cache); 22571ab6c499SDave Chinner freed++; 2258979df72eSTrond Myklebust if (!list_empty(&nfsi->access_cache_entry_lru)) 2259979df72eSTrond Myklebust list_move_tail(&nfsi->access_cache_inode_lru, 2260979df72eSTrond Myklebust &nfs_access_lru_list); 2261979df72eSTrond Myklebust else { 2262979df72eSTrond Myklebust remove_lru_entry: 2263979df72eSTrond Myklebust list_del_init(&nfsi->access_cache_inode_lru); 22644e857c58SPeter Zijlstra smp_mb__before_atomic(); 2265979df72eSTrond Myklebust clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); 22664e857c58SPeter Zijlstra smp_mb__after_atomic(); 2267979df72eSTrond Myklebust } 226859844a9bSTrond Myklebust spin_unlock(&inode->i_lock); 2269979df72eSTrond Myklebust } 2270979df72eSTrond Myklebust spin_unlock(&nfs_access_lru_lock); 22711a81bb8aSTrond Myklebust nfs_access_free_list(&head); 22721ab6c499SDave Chinner return freed; 22731ab6c499SDave Chinner } 22741ab6c499SDave Chinner 22751ab6c499SDave Chinner unsigned long 22763a505845STrond Myklebust nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc) 22773a505845STrond Myklebust { 22783a505845STrond Myklebust int nr_to_scan = sc->nr_to_scan; 22793a505845STrond Myklebust gfp_t gfp_mask = sc->gfp_mask; 22803a505845STrond Myklebust 22813a505845STrond Myklebust if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) 22823a505845STrond Myklebust return SHRINK_STOP; 22833a505845STrond Myklebust return nfs_do_access_cache_scan(nr_to_scan); 22843a505845STrond Myklebust } 22853a505845STrond Myklebust 22863a505845STrond Myklebust 22873a505845STrond Myklebust unsigned long 22881ab6c499SDave Chinner nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc) 22891ab6c499SDave Chinner { 229055f841ceSGlauber Costa return vfs_pressure_ratio(atomic_long_read(&nfs_access_nr_entries)); 2291979df72eSTrond Myklebust } 2292979df72eSTrond Myklebust 22933a505845STrond Myklebust static void 22943a505845STrond Myklebust nfs_access_cache_enforce_limit(void) 22953a505845STrond Myklebust { 22963a505845STrond Myklebust long nr_entries = atomic_long_read(&nfs_access_nr_entries); 22973a505845STrond Myklebust unsigned long diff; 22983a505845STrond Myklebust unsigned int nr_to_scan; 22993a505845STrond Myklebust 23003a505845STrond Myklebust if (nr_entries < 0 || nr_entries <= nfs_access_max_cachesize) 23013a505845STrond Myklebust return; 23023a505845STrond Myklebust nr_to_scan = 100; 23033a505845STrond Myklebust diff = nr_entries - nfs_access_max_cachesize; 23043a505845STrond Myklebust if (diff < nr_to_scan) 23053a505845STrond Myklebust nr_to_scan = diff; 23063a505845STrond Myklebust nfs_do_access_cache_scan(nr_to_scan); 23073a505845STrond Myklebust } 23083a505845STrond Myklebust 23091a81bb8aSTrond Myklebust static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) 23101c3c07e9STrond Myklebust { 23111c3c07e9STrond Myklebust struct rb_root *root_node = &nfsi->access_cache; 23121a81bb8aSTrond Myklebust struct rb_node *n; 23131c3c07e9STrond Myklebust struct nfs_access_entry *entry; 23141c3c07e9STrond Myklebust 23151c3c07e9STrond Myklebust /* Unhook entries from the cache */ 23161c3c07e9STrond Myklebust while ((n = rb_first(root_node)) != NULL) { 23171c3c07e9STrond Myklebust entry = rb_entry(n, struct nfs_access_entry, rb_node); 23181c3c07e9STrond Myklebust rb_erase(n, root_node); 23191a81bb8aSTrond Myklebust list_move(&entry->lru, head); 23201c3c07e9STrond Myklebust } 23211c3c07e9STrond Myklebust nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; 23221c3c07e9STrond Myklebust } 23231c3c07e9STrond Myklebust 23241c3c07e9STrond Myklebust void nfs_access_zap_cache(struct inode *inode) 23251c3c07e9STrond Myklebust { 23261a81bb8aSTrond Myklebust LIST_HEAD(head); 23271a81bb8aSTrond Myklebust 23281a81bb8aSTrond Myklebust if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) 23291a81bb8aSTrond Myklebust return; 2330cfcea3e8STrond Myklebust /* Remove from global LRU init */ 2331cfcea3e8STrond Myklebust spin_lock(&nfs_access_lru_lock); 23321a81bb8aSTrond Myklebust if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) 2333cfcea3e8STrond Myklebust list_del_init(&NFS_I(inode)->access_cache_inode_lru); 2334cfcea3e8STrond Myklebust 23351c3c07e9STrond Myklebust spin_lock(&inode->i_lock); 23361a81bb8aSTrond Myklebust __nfs_access_zap_cache(NFS_I(inode), &head); 23371a81bb8aSTrond Myklebust spin_unlock(&inode->i_lock); 23381a81bb8aSTrond Myklebust spin_unlock(&nfs_access_lru_lock); 23391a81bb8aSTrond Myklebust nfs_access_free_list(&head); 23401c3c07e9STrond Myklebust } 23411c606fb7SBryan Schumaker EXPORT_SYMBOL_GPL(nfs_access_zap_cache); 23421c3c07e9STrond Myklebust 2343b68572e0SNeilBrown static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, const struct cred *cred) 23441c3c07e9STrond Myklebust { 23451c3c07e9STrond Myklebust struct rb_node *n = NFS_I(inode)->access_cache.rb_node; 23461c3c07e9STrond Myklebust 23471c3c07e9STrond Myklebust while (n != NULL) { 2348b68572e0SNeilBrown struct nfs_access_entry *entry = 2349b68572e0SNeilBrown rb_entry(n, struct nfs_access_entry, rb_node); 2350b68572e0SNeilBrown int cmp = cred_fscmp(cred, entry->cred); 23511c3c07e9STrond Myklebust 2352b68572e0SNeilBrown if (cmp < 0) 23531c3c07e9STrond Myklebust n = n->rb_left; 2354b68572e0SNeilBrown else if (cmp > 0) 23551c3c07e9STrond Myklebust n = n->rb_right; 23561c3c07e9STrond Myklebust else 23571c3c07e9STrond Myklebust return entry; 23581c3c07e9STrond Myklebust } 23591c3c07e9STrond Myklebust return NULL; 23601c3c07e9STrond Myklebust } 23611c3c07e9STrond Myklebust 2362b68572e0SNeilBrown static int nfs_access_get_cached(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res, bool may_block) 23631da177e4SLinus Torvalds { 236455296809SChuck Lever struct nfs_inode *nfsi = NFS_I(inode); 23651c3c07e9STrond Myklebust struct nfs_access_entry *cache; 236657b69181STrond Myklebust bool retry = true; 236757b69181STrond Myklebust int err; 23681da177e4SLinus Torvalds 23691c3c07e9STrond Myklebust spin_lock(&inode->i_lock); 237057b69181STrond Myklebust for(;;) { 23711c3c07e9STrond Myklebust if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) 23721c3c07e9STrond Myklebust goto out_zap; 23731c3c07e9STrond Myklebust cache = nfs_access_search_rbtree(inode, cred); 237457b69181STrond Myklebust err = -ENOENT; 23751c3c07e9STrond Myklebust if (cache == NULL) 23761c3c07e9STrond Myklebust goto out; 237757b69181STrond Myklebust /* Found an entry, is our attribute cache valid? */ 237821c3ba7eSTrond Myklebust if (!nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) 237957b69181STrond Myklebust break; 238057b69181STrond Myklebust err = -ECHILD; 238157b69181STrond Myklebust if (!may_block) 238257b69181STrond Myklebust goto out; 238357b69181STrond Myklebust if (!retry) 238457b69181STrond Myklebust goto out_zap; 238557b69181STrond Myklebust spin_unlock(&inode->i_lock); 238657b69181STrond Myklebust err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 238757b69181STrond Myklebust if (err) 238857b69181STrond Myklebust return err; 238957b69181STrond Myklebust spin_lock(&inode->i_lock); 239057b69181STrond Myklebust retry = false; 239157b69181STrond Myklebust } 23921c3c07e9STrond Myklebust res->cred = cache->cred; 23931c3c07e9STrond Myklebust res->mask = cache->mask; 2394cfcea3e8STrond Myklebust list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); 23951c3c07e9STrond Myklebust err = 0; 23961c3c07e9STrond Myklebust out: 23971c3c07e9STrond Myklebust spin_unlock(&inode->i_lock); 23981c3c07e9STrond Myklebust return err; 23991c3c07e9STrond Myklebust out_zap: 24001a81bb8aSTrond Myklebust spin_unlock(&inode->i_lock); 24011a81bb8aSTrond Myklebust nfs_access_zap_cache(inode); 24021c3c07e9STrond Myklebust return -ENOENT; 24031c3c07e9STrond Myklebust } 24041c3c07e9STrond Myklebust 2405b68572e0SNeilBrown static int nfs_access_get_cached_rcu(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res) 2406f682a398SNeilBrown { 2407f682a398SNeilBrown /* Only check the most recently returned cache entry, 2408f682a398SNeilBrown * but do it without locking. 2409f682a398SNeilBrown */ 2410f682a398SNeilBrown struct nfs_inode *nfsi = NFS_I(inode); 2411f682a398SNeilBrown struct nfs_access_entry *cache; 2412f682a398SNeilBrown int err = -ECHILD; 2413f682a398SNeilBrown struct list_head *lh; 2414f682a398SNeilBrown 2415f682a398SNeilBrown rcu_read_lock(); 2416f682a398SNeilBrown if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) 2417f682a398SNeilBrown goto out; 2418f682a398SNeilBrown lh = rcu_dereference(nfsi->access_cache_entry_lru.prev); 2419f682a398SNeilBrown cache = list_entry(lh, struct nfs_access_entry, lru); 2420f682a398SNeilBrown if (lh == &nfsi->access_cache_entry_lru || 2421f682a398SNeilBrown cred != cache->cred) 2422f682a398SNeilBrown cache = NULL; 2423f682a398SNeilBrown if (cache == NULL) 2424f682a398SNeilBrown goto out; 242521c3ba7eSTrond Myklebust if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) 2426f682a398SNeilBrown goto out; 2427f682a398SNeilBrown res->cred = cache->cred; 2428f682a398SNeilBrown res->mask = cache->mask; 242921c3ba7eSTrond Myklebust err = 0; 2430f682a398SNeilBrown out: 2431f682a398SNeilBrown rcu_read_unlock(); 2432f682a398SNeilBrown return err; 2433f682a398SNeilBrown } 2434f682a398SNeilBrown 24351c3c07e9STrond Myklebust static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) 24361c3c07e9STrond Myklebust { 2437cfcea3e8STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 2438cfcea3e8STrond Myklebust struct rb_root *root_node = &nfsi->access_cache; 24391c3c07e9STrond Myklebust struct rb_node **p = &root_node->rb_node; 24401c3c07e9STrond Myklebust struct rb_node *parent = NULL; 24411c3c07e9STrond Myklebust struct nfs_access_entry *entry; 2442b68572e0SNeilBrown int cmp; 24431c3c07e9STrond Myklebust 24441c3c07e9STrond Myklebust spin_lock(&inode->i_lock); 24451c3c07e9STrond Myklebust while (*p != NULL) { 24461c3c07e9STrond Myklebust parent = *p; 24471c3c07e9STrond Myklebust entry = rb_entry(parent, struct nfs_access_entry, rb_node); 2448b68572e0SNeilBrown cmp = cred_fscmp(set->cred, entry->cred); 24491c3c07e9STrond Myklebust 2450b68572e0SNeilBrown if (cmp < 0) 24511c3c07e9STrond Myklebust p = &parent->rb_left; 2452b68572e0SNeilBrown else if (cmp > 0) 24531c3c07e9STrond Myklebust p = &parent->rb_right; 24541c3c07e9STrond Myklebust else 24551c3c07e9STrond Myklebust goto found; 24561c3c07e9STrond Myklebust } 24571c3c07e9STrond Myklebust rb_link_node(&set->rb_node, parent, p); 24581c3c07e9STrond Myklebust rb_insert_color(&set->rb_node, root_node); 2459cfcea3e8STrond Myklebust list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); 24601c3c07e9STrond Myklebust spin_unlock(&inode->i_lock); 24611c3c07e9STrond Myklebust return; 24621c3c07e9STrond Myklebust found: 24631c3c07e9STrond Myklebust rb_replace_node(parent, &set->rb_node, root_node); 2464cfcea3e8STrond Myklebust list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); 2465cfcea3e8STrond Myklebust list_del(&entry->lru); 24661c3c07e9STrond Myklebust spin_unlock(&inode->i_lock); 24671c3c07e9STrond Myklebust nfs_access_free_entry(entry); 24681da177e4SLinus Torvalds } 24691da177e4SLinus Torvalds 24706168f62cSWeston Andros Adamson void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) 24711da177e4SLinus Torvalds { 24721c3c07e9STrond Myklebust struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); 24731c3c07e9STrond Myklebust if (cache == NULL) 24741c3c07e9STrond Myklebust return; 24751c3c07e9STrond Myklebust RB_CLEAR_NODE(&cache->rb_node); 2476b68572e0SNeilBrown cache->cred = get_cred(set->cred); 24771da177e4SLinus Torvalds cache->mask = set->mask; 24781c3c07e9STrond Myklebust 2479f682a398SNeilBrown /* The above field assignments must be visible 2480f682a398SNeilBrown * before this item appears on the lru. We cannot easily 2481f682a398SNeilBrown * use rcu_assign_pointer, so just force the memory barrier. 2482f682a398SNeilBrown */ 2483f682a398SNeilBrown smp_wmb(); 24841c3c07e9STrond Myklebust nfs_access_add_rbtree(inode, cache); 2485cfcea3e8STrond Myklebust 2486cfcea3e8STrond Myklebust /* Update accounting */ 24874e857c58SPeter Zijlstra smp_mb__before_atomic(); 2488cfcea3e8STrond Myklebust atomic_long_inc(&nfs_access_nr_entries); 24894e857c58SPeter Zijlstra smp_mb__after_atomic(); 2490cfcea3e8STrond Myklebust 2491cfcea3e8STrond Myklebust /* Add inode to global LRU list */ 24921a81bb8aSTrond Myklebust if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { 2493cfcea3e8STrond Myklebust spin_lock(&nfs_access_lru_lock); 24941a81bb8aSTrond Myklebust if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) 24951a81bb8aSTrond Myklebust list_add_tail(&NFS_I(inode)->access_cache_inode_lru, 24961a81bb8aSTrond Myklebust &nfs_access_lru_list); 2497cfcea3e8STrond Myklebust spin_unlock(&nfs_access_lru_lock); 2498cfcea3e8STrond Myklebust } 24993a505845STrond Myklebust nfs_access_cache_enforce_limit(); 25001da177e4SLinus Torvalds } 25016168f62cSWeston Andros Adamson EXPORT_SYMBOL_GPL(nfs_access_add_cache); 25026168f62cSWeston Andros Adamson 25033c181827SAnna Schumaker #define NFS_MAY_READ (NFS_ACCESS_READ) 25043c181827SAnna Schumaker #define NFS_MAY_WRITE (NFS_ACCESS_MODIFY | \ 25053c181827SAnna Schumaker NFS_ACCESS_EXTEND | \ 25063c181827SAnna Schumaker NFS_ACCESS_DELETE) 25073c181827SAnna Schumaker #define NFS_FILE_MAY_WRITE (NFS_ACCESS_MODIFY | \ 25083c181827SAnna Schumaker NFS_ACCESS_EXTEND) 2509ecbb903cSTrond Myklebust #define NFS_DIR_MAY_WRITE NFS_MAY_WRITE 25103c181827SAnna Schumaker #define NFS_MAY_LOOKUP (NFS_ACCESS_LOOKUP) 25113c181827SAnna Schumaker #define NFS_MAY_EXECUTE (NFS_ACCESS_EXECUTE) 251215d4b73aSTrond Myklebust static int 2513ecbb903cSTrond Myklebust nfs_access_calc_mask(u32 access_result, umode_t umode) 251415d4b73aSTrond Myklebust { 251515d4b73aSTrond Myklebust int mask = 0; 251615d4b73aSTrond Myklebust 251715d4b73aSTrond Myklebust if (access_result & NFS_MAY_READ) 251815d4b73aSTrond Myklebust mask |= MAY_READ; 2519ecbb903cSTrond Myklebust if (S_ISDIR(umode)) { 2520ecbb903cSTrond Myklebust if ((access_result & NFS_DIR_MAY_WRITE) == NFS_DIR_MAY_WRITE) 252115d4b73aSTrond Myklebust mask |= MAY_WRITE; 2522ecbb903cSTrond Myklebust if ((access_result & NFS_MAY_LOOKUP) == NFS_MAY_LOOKUP) 252315d4b73aSTrond Myklebust mask |= MAY_EXEC; 2524ecbb903cSTrond Myklebust } else if (S_ISREG(umode)) { 2525ecbb903cSTrond Myklebust if ((access_result & NFS_FILE_MAY_WRITE) == NFS_FILE_MAY_WRITE) 2526ecbb903cSTrond Myklebust mask |= MAY_WRITE; 2527ecbb903cSTrond Myklebust if ((access_result & NFS_MAY_EXECUTE) == NFS_MAY_EXECUTE) 252815d4b73aSTrond Myklebust mask |= MAY_EXEC; 2529ecbb903cSTrond Myklebust } else if (access_result & NFS_MAY_WRITE) 2530ecbb903cSTrond Myklebust mask |= MAY_WRITE; 253115d4b73aSTrond Myklebust return mask; 253215d4b73aSTrond Myklebust } 253315d4b73aSTrond Myklebust 25346168f62cSWeston Andros Adamson void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result) 25356168f62cSWeston Andros Adamson { 2536bd8b2441STrond Myklebust entry->mask = access_result; 25376168f62cSWeston Andros Adamson } 25386168f62cSWeston Andros Adamson EXPORT_SYMBOL_GPL(nfs_access_set_mask); 25391da177e4SLinus Torvalds 2540b68572e0SNeilBrown static int nfs_do_access(struct inode *inode, const struct cred *cred, int mask) 25411da177e4SLinus Torvalds { 25421da177e4SLinus Torvalds struct nfs_access_entry cache; 254357b69181STrond Myklebust bool may_block = (mask & MAY_NOT_BLOCK) == 0; 2544bd8b2441STrond Myklebust int cache_mask; 25451da177e4SLinus Torvalds int status; 25461da177e4SLinus Torvalds 2547f4ce1299STrond Myklebust trace_nfs_access_enter(inode); 2548f4ce1299STrond Myklebust 2549f682a398SNeilBrown status = nfs_access_get_cached_rcu(inode, cred, &cache); 2550f682a398SNeilBrown if (status != 0) 255157b69181STrond Myklebust status = nfs_access_get_cached(inode, cred, &cache, may_block); 25521da177e4SLinus Torvalds if (status == 0) 2553f4ce1299STrond Myklebust goto out_cached; 25541da177e4SLinus Torvalds 2555f3324a2aSNeilBrown status = -ECHILD; 255657b69181STrond Myklebust if (!may_block) 2557f3324a2aSNeilBrown goto out; 2558f3324a2aSNeilBrown 25591750d929SAnna Schumaker /* 25601750d929SAnna Schumaker * Determine which access bits we want to ask for... 25611750d929SAnna Schumaker */ 25621750d929SAnna Schumaker cache.mask = NFS_ACCESS_READ | NFS_ACCESS_MODIFY | NFS_ACCESS_EXTEND; 25631750d929SAnna Schumaker if (S_ISDIR(inode->i_mode)) 25641750d929SAnna Schumaker cache.mask |= NFS_ACCESS_DELETE | NFS_ACCESS_LOOKUP; 25651750d929SAnna Schumaker else 25661750d929SAnna Schumaker cache.mask |= NFS_ACCESS_EXECUTE; 25671da177e4SLinus Torvalds cache.cred = cred; 25681da177e4SLinus Torvalds status = NFS_PROTO(inode)->access(inode, &cache); 2569a71ee337SSuresh Jayaraman if (status != 0) { 2570a71ee337SSuresh Jayaraman if (status == -ESTALE) { 2571a71ee337SSuresh Jayaraman nfs_zap_caches(inode); 2572a71ee337SSuresh Jayaraman if (!S_ISDIR(inode->i_mode)) 2573a71ee337SSuresh Jayaraman set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); 2574a71ee337SSuresh Jayaraman } 2575f4ce1299STrond Myklebust goto out; 2576a71ee337SSuresh Jayaraman } 25771da177e4SLinus Torvalds nfs_access_add_cache(inode, &cache); 2578f4ce1299STrond Myklebust out_cached: 2579ecbb903cSTrond Myklebust cache_mask = nfs_access_calc_mask(cache.mask, inode->i_mode); 2580bd8b2441STrond Myklebust if ((mask & ~cache_mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0) 2581f4ce1299STrond Myklebust status = -EACCES; 25821da177e4SLinus Torvalds out: 2583f4ce1299STrond Myklebust trace_nfs_access_exit(inode, status); 2584f4ce1299STrond Myklebust return status; 25851da177e4SLinus Torvalds } 25861da177e4SLinus Torvalds 2587af22f94aSTrond Myklebust static int nfs_open_permission_mask(int openflags) 2588af22f94aSTrond Myklebust { 2589af22f94aSTrond Myklebust int mask = 0; 2590af22f94aSTrond Myklebust 2591f8d9a897SWeston Andros Adamson if (openflags & __FMODE_EXEC) { 2592f8d9a897SWeston Andros Adamson /* ONLY check exec rights */ 2593f8d9a897SWeston Andros Adamson mask = MAY_EXEC; 2594f8d9a897SWeston Andros Adamson } else { 25958a5e929dSAl Viro if ((openflags & O_ACCMODE) != O_WRONLY) 2596af22f94aSTrond Myklebust mask |= MAY_READ; 25978a5e929dSAl Viro if ((openflags & O_ACCMODE) != O_RDONLY) 2598af22f94aSTrond Myklebust mask |= MAY_WRITE; 2599f8d9a897SWeston Andros Adamson } 2600f8d9a897SWeston Andros Adamson 2601af22f94aSTrond Myklebust return mask; 2602af22f94aSTrond Myklebust } 2603af22f94aSTrond Myklebust 2604b68572e0SNeilBrown int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags) 2605af22f94aSTrond Myklebust { 2606af22f94aSTrond Myklebust return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); 2607af22f94aSTrond Myklebust } 260889d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_may_open); 2609af22f94aSTrond Myklebust 26105c5fc09aSTrond Myklebust static int nfs_execute_ok(struct inode *inode, int mask) 26115c5fc09aSTrond Myklebust { 26125c5fc09aSTrond Myklebust struct nfs_server *server = NFS_SERVER(inode); 261321c3ba7eSTrond Myklebust int ret = 0; 26145c5fc09aSTrond Myklebust 26153825827eSTrond Myklebust if (S_ISDIR(inode->i_mode)) 26163825827eSTrond Myklebust return 0; 2617cf834027STrond Myklebust if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_OTHER)) { 26185c5fc09aSTrond Myklebust if (mask & MAY_NOT_BLOCK) 261921c3ba7eSTrond Myklebust return -ECHILD; 262021c3ba7eSTrond Myklebust ret = __nfs_revalidate_inode(server, inode); 262121c3ba7eSTrond Myklebust } 26225c5fc09aSTrond Myklebust if (ret == 0 && !execute_ok(inode)) 26235c5fc09aSTrond Myklebust ret = -EACCES; 26245c5fc09aSTrond Myklebust return ret; 26255c5fc09aSTrond Myklebust } 26265c5fc09aSTrond Myklebust 262710556cb2SAl Viro int nfs_permission(struct inode *inode, int mask) 26281da177e4SLinus Torvalds { 2629b68572e0SNeilBrown const struct cred *cred = current_cred(); 26301da177e4SLinus Torvalds int res = 0; 26311da177e4SLinus Torvalds 263291d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSACCESS); 263391d5b470SChuck Lever 2634e6305c43SAl Viro if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) 26351da177e4SLinus Torvalds goto out; 26361da177e4SLinus Torvalds /* Is this sys_access() ? */ 26379cfcac81SEric Paris if (mask & (MAY_ACCESS | MAY_CHDIR)) 26381da177e4SLinus Torvalds goto force_lookup; 26391da177e4SLinus Torvalds 26401da177e4SLinus Torvalds switch (inode->i_mode & S_IFMT) { 26411da177e4SLinus Torvalds case S_IFLNK: 26421da177e4SLinus Torvalds goto out; 26431da177e4SLinus Torvalds case S_IFREG: 2644762674f8STrond Myklebust if ((mask & MAY_OPEN) && 2645762674f8STrond Myklebust nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN)) 2646762674f8STrond Myklebust return 0; 26471da177e4SLinus Torvalds break; 26481da177e4SLinus Torvalds case S_IFDIR: 26491da177e4SLinus Torvalds /* 26501da177e4SLinus Torvalds * Optimize away all write operations, since the server 26511da177e4SLinus Torvalds * will check permissions when we perform the op. 26521da177e4SLinus Torvalds */ 26531da177e4SLinus Torvalds if ((mask & MAY_WRITE) && !(mask & MAY_READ)) 26541da177e4SLinus Torvalds goto out; 26551da177e4SLinus Torvalds } 26561da177e4SLinus Torvalds 26571da177e4SLinus Torvalds force_lookup: 26581da177e4SLinus Torvalds if (!NFS_PROTO(inode)->access) 26591da177e4SLinus Torvalds goto out_notsup; 26601da177e4SLinus Torvalds 2661f3324a2aSNeilBrown /* Always try fast lookups first */ 2662f3324a2aSNeilBrown rcu_read_lock(); 2663f3324a2aSNeilBrown res = nfs_do_access(inode, cred, mask|MAY_NOT_BLOCK); 2664f3324a2aSNeilBrown rcu_read_unlock(); 2665f3324a2aSNeilBrown if (res == -ECHILD && !(mask & MAY_NOT_BLOCK)) { 2666f3324a2aSNeilBrown /* Fast lookup failed, try the slow way */ 26671da177e4SLinus Torvalds res = nfs_do_access(inode, cred, mask); 2668f3324a2aSNeilBrown } 26691da177e4SLinus Torvalds out: 26705c5fc09aSTrond Myklebust if (!res && (mask & MAY_EXEC)) 26715c5fc09aSTrond Myklebust res = nfs_execute_ok(inode, mask); 2672f696a365SMiklos Szeredi 26731e8968c5SNiels de Vos dfprintk(VFS, "NFS: permission(%s/%lu), mask=0x%x, res=%d\n", 26741e7cb3dcSChuck Lever inode->i_sb->s_id, inode->i_ino, mask, res); 26751da177e4SLinus Torvalds return res; 26761da177e4SLinus Torvalds out_notsup: 2677d51ac1a8SNeilBrown if (mask & MAY_NOT_BLOCK) 2678d51ac1a8SNeilBrown return -ECHILD; 2679d51ac1a8SNeilBrown 26801da177e4SLinus Torvalds res = nfs_revalidate_inode(NFS_SERVER(inode), inode); 26811da177e4SLinus Torvalds if (res == 0) 26822830ba7fSAl Viro res = generic_permission(inode, mask); 26831e7cb3dcSChuck Lever goto out; 26841da177e4SLinus Torvalds } 2685ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_permission); 26861da177e4SLinus Torvalds 26871da177e4SLinus Torvalds /* 26881da177e4SLinus Torvalds * Local variables: 26891da177e4SLinus Torvalds * version-control: t 26901da177e4SLinus Torvalds * kept-new-versions: 5 26911da177e4SLinus Torvalds * End: 26921da177e4SLinus Torvalds */ 2693