1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * File operations used by nfsd. Some of these have been ripped from 41da177e4SLinus Torvalds * other parts of the kernel because they weren't exported, others 51da177e4SLinus Torvalds * are partial duplicates with added or changed functionality. 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * Note that several functions dget() the dentry upon which they want 81da177e4SLinus Torvalds * to act, most notably those that create directory entries. Response 91da177e4SLinus Torvalds * dentry's are dput()'d if necessary in the release callback. 101da177e4SLinus Torvalds * So if you notice code paths that apparently fail to dput() the 111da177e4SLinus Torvalds * dentry, don't worry--they have been taken care of. 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> 141da177e4SLinus Torvalds * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> 151da177e4SLinus Torvalds */ 161da177e4SLinus Torvalds 171da177e4SLinus Torvalds #include <linux/fs.h> 181da177e4SLinus Torvalds #include <linux/file.h> 19d6b29d7cSJens Axboe #include <linux/splice.h> 2095d871f0SAnna Schumaker #include <linux/falloc.h> 211da177e4SLinus Torvalds #include <linux/fcntl.h> 221da177e4SLinus Torvalds #include <linux/namei.h> 231da177e4SLinus Torvalds #include <linux/delay.h> 240eeca283SRobert Love #include <linux/fsnotify.h> 251da177e4SLinus Torvalds #include <linux/posix_acl_xattr.h> 261da177e4SLinus Torvalds #include <linux/xattr.h> 279a74af21SBoaz Harrosh #include <linux/jhash.h> 289a74af21SBoaz Harrosh #include <linux/ima.h> 295a0e3ad6STejun Heo #include <linux/slab.h> 307c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 31f501912aSBen Myers #include <linux/exportfs.h> 32f501912aSBen Myers #include <linux/writeback.h> 3318032ca0SDavid Quigley #include <linux/security.h> 349a74af21SBoaz Harrosh 359a74af21SBoaz Harrosh #ifdef CONFIG_NFSD_V3 369a74af21SBoaz Harrosh #include "xdr3.h" 379a74af21SBoaz Harrosh #endif /* CONFIG_NFSD_V3 */ 389a74af21SBoaz Harrosh 395be196e5SChristoph Hellwig #ifdef CONFIG_NFSD_V4 40ffa0160aSChristoph Hellwig #include "../internal.h" 412ca72e17SJ. Bruce Fields #include "acl.h" 422ca72e17SJ. Bruce Fields #include "idmap.h" 431da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V4 */ 441da177e4SLinus Torvalds 459a74af21SBoaz Harrosh #include "nfsd.h" 469a74af21SBoaz Harrosh #include "vfs.h" 476e8b50d1SJeff Layton #include "trace.h" 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds #define NFSDDBG_FACILITY NFSDDBG_FILEOP 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds /* 531da177e4SLinus Torvalds * This is a cache of readahead params that help us choose the proper 541da177e4SLinus Torvalds * readahead strategy. Initially, we set all readahead parameters to 0 551da177e4SLinus Torvalds * and let the VFS handle things. 561da177e4SLinus Torvalds * If you increase the number of cached files very much, you'll need to 571da177e4SLinus Torvalds * add a hash table here. 581da177e4SLinus Torvalds */ 591da177e4SLinus Torvalds struct raparms { 601da177e4SLinus Torvalds struct raparms *p_next; 611da177e4SLinus Torvalds unsigned int p_count; 621da177e4SLinus Torvalds ino_t p_ino; 631da177e4SLinus Torvalds dev_t p_dev; 641da177e4SLinus Torvalds int p_set; 651da177e4SLinus Torvalds struct file_ra_state p_ra; 66fce1456aSGreg Banks unsigned int p_hindex; 671da177e4SLinus Torvalds }; 681da177e4SLinus Torvalds 69fce1456aSGreg Banks struct raparm_hbucket { 70fce1456aSGreg Banks struct raparms *pb_head; 71fce1456aSGreg Banks spinlock_t pb_lock; 72fce1456aSGreg Banks } ____cacheline_aligned_in_smp; 73fce1456aSGreg Banks 74fce1456aSGreg Banks #define RAPARM_HASH_BITS 4 75fce1456aSGreg Banks #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) 76fce1456aSGreg Banks #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) 77fce1456aSGreg Banks static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds /* 801da177e4SLinus Torvalds * Called from nfsd_lookup and encode_dirent. Check if we have crossed 811da177e4SLinus Torvalds * a mount point. 82e0bb89efSJ.Bruce Fields * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, 831da177e4SLinus Torvalds * or nfs_ok having possibly changed *dpp and *expp 841da177e4SLinus Torvalds */ 851da177e4SLinus Torvalds int 861da177e4SLinus Torvalds nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 871da177e4SLinus Torvalds struct svc_export **expp) 881da177e4SLinus Torvalds { 891da177e4SLinus Torvalds struct svc_export *exp = *expp, *exp2 = NULL; 901da177e4SLinus Torvalds struct dentry *dentry = *dpp; 9191c9fa8fSAl Viro struct path path = {.mnt = mntget(exp->ex_path.mnt), 9291c9fa8fSAl Viro .dentry = dget(dentry)}; 936264d69dSAl Viro int err = 0; 941da177e4SLinus Torvalds 957cc90cc3SAl Viro err = follow_down(&path); 96cc53ce53SDavid Howells if (err < 0) 97cc53ce53SDavid Howells goto out; 9899bbf6ecSNeilBrown if (path.mnt == exp->ex_path.mnt && path.dentry == dentry && 9999bbf6ecSNeilBrown nfsd_mountpoint(dentry, exp) == 2) { 10099bbf6ecSNeilBrown /* This is only a mountpoint in some other namespace */ 10199bbf6ecSNeilBrown path_put(&path); 10299bbf6ecSNeilBrown goto out; 10399bbf6ecSNeilBrown } 1041da177e4SLinus Torvalds 10591c9fa8fSAl Viro exp2 = rqst_exp_get_by_name(rqstp, &path); 1061da177e4SLinus Torvalds if (IS_ERR(exp2)) { 1071da177e4SLinus Torvalds err = PTR_ERR(exp2); 1083b6cee7bSJ. Bruce Fields /* 1093b6cee7bSJ. Bruce Fields * We normally allow NFS clients to continue 1103b6cee7bSJ. Bruce Fields * "underneath" a mountpoint that is not exported. 1113b6cee7bSJ. Bruce Fields * The exception is V4ROOT, where no traversal is ever 1123b6cee7bSJ. Bruce Fields * allowed without an explicit export of the new 1133b6cee7bSJ. Bruce Fields * directory. 1143b6cee7bSJ. Bruce Fields */ 1153b6cee7bSJ. Bruce Fields if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) 1163b6cee7bSJ. Bruce Fields err = 0; 11791c9fa8fSAl Viro path_put(&path); 1181da177e4SLinus Torvalds goto out; 1191da177e4SLinus Torvalds } 1203c394ddaSSteve Dickson if (nfsd_v4client(rqstp) || 1213c394ddaSSteve Dickson (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { 1221da177e4SLinus Torvalds /* successfully crossed mount point */ 1231644ccc8SAl Viro /* 12491c9fa8fSAl Viro * This is subtle: path.dentry is *not* on path.mnt 12591c9fa8fSAl Viro * at this point. The only reason we are safe is that 12691c9fa8fSAl Viro * original mnt is pinned down by exp, so we should 12791c9fa8fSAl Viro * put path *before* putting exp 1281644ccc8SAl Viro */ 12991c9fa8fSAl Viro *dpp = path.dentry; 13091c9fa8fSAl Viro path.dentry = dentry; 1311644ccc8SAl Viro *expp = exp2; 13291c9fa8fSAl Viro exp2 = exp; 1331da177e4SLinus Torvalds } 13491c9fa8fSAl Viro path_put(&path); 13591c9fa8fSAl Viro exp_put(exp2); 1361da177e4SLinus Torvalds out: 1371da177e4SLinus Torvalds return err; 1381da177e4SLinus Torvalds } 1391da177e4SLinus Torvalds 140289ede45SJ. Bruce Fields static void follow_to_parent(struct path *path) 141289ede45SJ. Bruce Fields { 142289ede45SJ. Bruce Fields struct dentry *dp; 143289ede45SJ. Bruce Fields 144289ede45SJ. Bruce Fields while (path->dentry == path->mnt->mnt_root && follow_up(path)) 145289ede45SJ. Bruce Fields ; 146289ede45SJ. Bruce Fields dp = dget_parent(path->dentry); 147289ede45SJ. Bruce Fields dput(path->dentry); 148289ede45SJ. Bruce Fields path->dentry = dp; 149289ede45SJ. Bruce Fields } 150289ede45SJ. Bruce Fields 151289ede45SJ. Bruce Fields static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) 152289ede45SJ. Bruce Fields { 153289ede45SJ. Bruce Fields struct svc_export *exp2; 154289ede45SJ. Bruce Fields struct path path = {.mnt = mntget((*exp)->ex_path.mnt), 155289ede45SJ. Bruce Fields .dentry = dget(dparent)}; 156289ede45SJ. Bruce Fields 157289ede45SJ. Bruce Fields follow_to_parent(&path); 158289ede45SJ. Bruce Fields 159289ede45SJ. Bruce Fields exp2 = rqst_exp_parent(rqstp, &path); 160289ede45SJ. Bruce Fields if (PTR_ERR(exp2) == -ENOENT) { 161289ede45SJ. Bruce Fields *dentryp = dget(dparent); 162289ede45SJ. Bruce Fields } else if (IS_ERR(exp2)) { 163289ede45SJ. Bruce Fields path_put(&path); 164289ede45SJ. Bruce Fields return PTR_ERR(exp2); 165289ede45SJ. Bruce Fields } else { 166289ede45SJ. Bruce Fields *dentryp = dget(path.dentry); 167289ede45SJ. Bruce Fields exp_put(*exp); 168289ede45SJ. Bruce Fields *exp = exp2; 169289ede45SJ. Bruce Fields } 170289ede45SJ. Bruce Fields path_put(&path); 171289ede45SJ. Bruce Fields return 0; 172289ede45SJ. Bruce Fields } 173289ede45SJ. Bruce Fields 17482ead7feSJ. Bruce Fields /* 17582ead7feSJ. Bruce Fields * For nfsd purposes, we treat V4ROOT exports as though there was an 17682ead7feSJ. Bruce Fields * export at *every* directory. 17799bbf6ecSNeilBrown * We return: 17899bbf6ecSNeilBrown * '1' if this dentry *must* be an export point, 17999bbf6ecSNeilBrown * '2' if it might be, if there is really a mount here, and 18099bbf6ecSNeilBrown * '0' if there is no chance of an export point here. 18182ead7feSJ. Bruce Fields */ 1823227fa41SJ. Bruce Fields int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) 18382ead7feSJ. Bruce Fields { 18499bbf6ecSNeilBrown if (!d_inode(dentry)) 18599bbf6ecSNeilBrown return 0; 18699bbf6ecSNeilBrown if (exp->ex_flags & NFSEXP_V4ROOT) 18782ead7feSJ. Bruce Fields return 1; 18811fcee02STrond Myklebust if (nfsd4_is_junction(dentry)) 18911fcee02STrond Myklebust return 1; 19099bbf6ecSNeilBrown if (d_mountpoint(dentry)) 19199bbf6ecSNeilBrown /* 19299bbf6ecSNeilBrown * Might only be a mountpoint in a different namespace, 19399bbf6ecSNeilBrown * but we need to check. 19499bbf6ecSNeilBrown */ 19599bbf6ecSNeilBrown return 2; 19682ead7feSJ. Bruce Fields return 0; 19782ead7feSJ. Bruce Fields } 19882ead7feSJ. Bruce Fields 1996264d69dSAl Viro __be32 2006c0a654dSJ. Bruce Fields nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, 2015a022fc8SChuck Lever const char *name, unsigned int len, 2026c0a654dSJ. Bruce Fields struct svc_export **exp_ret, struct dentry **dentry_ret) 2031da177e4SLinus Torvalds { 2041da177e4SLinus Torvalds struct svc_export *exp; 2051da177e4SLinus Torvalds struct dentry *dparent; 2061da177e4SLinus Torvalds struct dentry *dentry; 2076264d69dSAl Viro int host_err; 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds dparent = fhp->fh_dentry; 212bf18f163SKinglong Mee exp = exp_get(fhp->fh_export); 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds /* Lookup the name, but don't follow links */ 2151da177e4SLinus Torvalds if (isdotent(name, len)) { 2161da177e4SLinus Torvalds if (len==1) 2171da177e4SLinus Torvalds dentry = dget(dparent); 21854775491SJan Blunck else if (dparent != exp->ex_path.dentry) 2191da177e4SLinus Torvalds dentry = dget_parent(dparent); 220fed83811SJ. Bruce Fields else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) 2211da177e4SLinus Torvalds dentry = dget(dparent); /* .. == . just like at / */ 2221da177e4SLinus Torvalds else { 2231da177e4SLinus Torvalds /* checking mountpoint crossing is very different when stepping up */ 224289ede45SJ. Bruce Fields host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); 225289ede45SJ. Bruce Fields if (host_err) 2261da177e4SLinus Torvalds goto out_nfserr; 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds } else { 2294335723eSJ. Bruce Fields /* 2304335723eSJ. Bruce Fields * In the nfsd4_open() case, this may be held across 2314335723eSJ. Bruce Fields * subsequent open and delegation acquisition which may 2324335723eSJ. Bruce Fields * need to take the child's i_mutex: 2334335723eSJ. Bruce Fields */ 2344335723eSJ. Bruce Fields fh_lock_nested(fhp, I_MUTEX_PARENT); 2351da177e4SLinus Torvalds dentry = lookup_one_len(name, dparent, len); 2366264d69dSAl Viro host_err = PTR_ERR(dentry); 2371da177e4SLinus Torvalds if (IS_ERR(dentry)) 2381da177e4SLinus Torvalds goto out_nfserr; 23982ead7feSJ. Bruce Fields if (nfsd_mountpoint(dentry, exp)) { 240bbddca8eSNeilBrown /* 241bbddca8eSNeilBrown * We don't need the i_mutex after all. It's 242bbddca8eSNeilBrown * still possible we could open this (regular 243bbddca8eSNeilBrown * files can be mountpoints too), but the 244bbddca8eSNeilBrown * i_mutex is just there to prevent renames of 245bbddca8eSNeilBrown * something that we might be about to delegate, 246bbddca8eSNeilBrown * and a mountpoint won't be renamed: 247bbddca8eSNeilBrown */ 248bbddca8eSNeilBrown fh_unlock(fhp); 2496264d69dSAl Viro if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 2501da177e4SLinus Torvalds dput(dentry); 2511da177e4SLinus Torvalds goto out_nfserr; 2521da177e4SLinus Torvalds } 2531da177e4SLinus Torvalds } 2541da177e4SLinus Torvalds } 2556c0a654dSJ. Bruce Fields *dentry_ret = dentry; 2566c0a654dSJ. Bruce Fields *exp_ret = exp; 2576c0a654dSJ. Bruce Fields return 0; 2586c0a654dSJ. Bruce Fields 2596c0a654dSJ. Bruce Fields out_nfserr: 2606c0a654dSJ. Bruce Fields exp_put(exp); 2616c0a654dSJ. Bruce Fields return nfserrno(host_err); 2626c0a654dSJ. Bruce Fields } 2636c0a654dSJ. Bruce Fields 2646c0a654dSJ. Bruce Fields /* 2656c0a654dSJ. Bruce Fields * Look up one component of a pathname. 2666c0a654dSJ. Bruce Fields * N.B. After this call _both_ fhp and resfh need an fh_put 2676c0a654dSJ. Bruce Fields * 2686c0a654dSJ. Bruce Fields * If the lookup would cross a mountpoint, and the mounted filesystem 2696c0a654dSJ. Bruce Fields * is exported to the client with NFSEXP_NOHIDE, then the lookup is 2706c0a654dSJ. Bruce Fields * accepted as it stands and the mounted directory is 2716c0a654dSJ. Bruce Fields * returned. Otherwise the covered directory is returned. 2726c0a654dSJ. Bruce Fields * NOTE: this mountpoint crossing is not supported properly by all 2736c0a654dSJ. Bruce Fields * clients and is explicitly disallowed for NFSv3 2746c0a654dSJ. Bruce Fields * NeilBrown <neilb@cse.unsw.edu.au> 2756c0a654dSJ. Bruce Fields */ 2766c0a654dSJ. Bruce Fields __be32 2776c0a654dSJ. Bruce Fields nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 2785a022fc8SChuck Lever unsigned int len, struct svc_fh *resfh) 2796c0a654dSJ. Bruce Fields { 2806c0a654dSJ. Bruce Fields struct svc_export *exp; 2816c0a654dSJ. Bruce Fields struct dentry *dentry; 2826c0a654dSJ. Bruce Fields __be32 err; 2836c0a654dSJ. Bruce Fields 28429a78a3eSJ. Bruce Fields err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 28529a78a3eSJ. Bruce Fields if (err) 28629a78a3eSJ. Bruce Fields return err; 2876c0a654dSJ. Bruce Fields err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); 2886c0a654dSJ. Bruce Fields if (err) 2896c0a654dSJ. Bruce Fields return err; 29032c1eb0cSAndy Adamson err = check_nfsd_access(exp, rqstp); 29132c1eb0cSAndy Adamson if (err) 29232c1eb0cSAndy Adamson goto out; 2931da177e4SLinus Torvalds /* 2941da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2951da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2961da177e4SLinus Torvalds */ 2971da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2982b0143b5SDavid Howells if (!err && d_really_is_negative(dentry)) 2991da177e4SLinus Torvalds err = nfserr_noent; 30032c1eb0cSAndy Adamson out: 3011da177e4SLinus Torvalds dput(dentry); 3021da177e4SLinus Torvalds exp_put(exp); 3031da177e4SLinus Torvalds return err; 3041da177e4SLinus Torvalds } 3051da177e4SLinus Torvalds 306f501912aSBen Myers /* 307f501912aSBen Myers * Commit metadata changes to stable storage. 308f501912aSBen Myers */ 309f501912aSBen Myers static int 310f501912aSBen Myers commit_metadata(struct svc_fh *fhp) 311f501912aSBen Myers { 3122b0143b5SDavid Howells struct inode *inode = d_inode(fhp->fh_dentry); 313f501912aSBen Myers const struct export_operations *export_ops = inode->i_sb->s_export_op; 314f501912aSBen Myers 315f501912aSBen Myers if (!EX_ISSYNC(fhp->fh_export)) 316f501912aSBen Myers return 0; 317f501912aSBen Myers 318c3765016SChristoph Hellwig if (export_ops->commit_metadata) 319c3765016SChristoph Hellwig return export_ops->commit_metadata(inode); 320c3765016SChristoph Hellwig return sync_inode_metadata(inode, 1); 321f501912aSBen Myers } 3226c0a654dSJ. Bruce Fields 3231da177e4SLinus Torvalds /* 324818e5a22SChristoph Hellwig * Go over the attributes and take care of the small differences between 325818e5a22SChristoph Hellwig * NFS semantics and what Linux expects. 326818e5a22SChristoph Hellwig */ 327818e5a22SChristoph Hellwig static void 328818e5a22SChristoph Hellwig nfsd_sanitize_attrs(struct inode *inode, struct iattr *iap) 329818e5a22SChristoph Hellwig { 330818e5a22SChristoph Hellwig /* sanitize the mode change */ 331818e5a22SChristoph Hellwig if (iap->ia_valid & ATTR_MODE) { 332818e5a22SChristoph Hellwig iap->ia_mode &= S_IALLUGO; 333818e5a22SChristoph Hellwig iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); 334818e5a22SChristoph Hellwig } 335818e5a22SChristoph Hellwig 336818e5a22SChristoph Hellwig /* Revoke setuid/setgid on chown */ 337818e5a22SChristoph Hellwig if (!S_ISDIR(inode->i_mode) && 338c4fa6d7cSStanislav Kholmanskikh ((iap->ia_valid & ATTR_UID) || (iap->ia_valid & ATTR_GID))) { 339818e5a22SChristoph Hellwig iap->ia_valid |= ATTR_KILL_PRIV; 340818e5a22SChristoph Hellwig if (iap->ia_valid & ATTR_MODE) { 341818e5a22SChristoph Hellwig /* we're setting mode too, just clear the s*id bits */ 342818e5a22SChristoph Hellwig iap->ia_mode &= ~S_ISUID; 343818e5a22SChristoph Hellwig if (iap->ia_mode & S_IXGRP) 344818e5a22SChristoph Hellwig iap->ia_mode &= ~S_ISGID; 345818e5a22SChristoph Hellwig } else { 346818e5a22SChristoph Hellwig /* set ATTR_KILL_* bits and let VFS handle it */ 347818e5a22SChristoph Hellwig iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); 348818e5a22SChristoph Hellwig } 349818e5a22SChristoph Hellwig } 350818e5a22SChristoph Hellwig } 351818e5a22SChristoph Hellwig 3520839ffb8SJ. Bruce Fields static __be32 3530839ffb8SJ. Bruce Fields nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp, 3540839ffb8SJ. Bruce Fields struct iattr *iap) 3550839ffb8SJ. Bruce Fields { 3560839ffb8SJ. Bruce Fields struct inode *inode = d_inode(fhp->fh_dentry); 3570839ffb8SJ. Bruce Fields int host_err; 3580839ffb8SJ. Bruce Fields 3590839ffb8SJ. Bruce Fields if (iap->ia_size < inode->i_size) { 3600839ffb8SJ. Bruce Fields __be32 err; 3610839ffb8SJ. Bruce Fields 3620839ffb8SJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 3630839ffb8SJ. Bruce Fields NFSD_MAY_TRUNC | NFSD_MAY_OWNER_OVERRIDE); 3640839ffb8SJ. Bruce Fields if (err) 3650839ffb8SJ. Bruce Fields return err; 3660839ffb8SJ. Bruce Fields } 3670839ffb8SJ. Bruce Fields 3680839ffb8SJ. Bruce Fields host_err = get_write_access(inode); 3690839ffb8SJ. Bruce Fields if (host_err) 3700839ffb8SJ. Bruce Fields goto out_nfserrno; 3710839ffb8SJ. Bruce Fields 3720839ffb8SJ. Bruce Fields host_err = locks_verify_truncate(inode, NULL, iap->ia_size); 3730839ffb8SJ. Bruce Fields if (host_err) 3740839ffb8SJ. Bruce Fields goto out_put_write_access; 3750839ffb8SJ. Bruce Fields return 0; 3760839ffb8SJ. Bruce Fields 3770839ffb8SJ. Bruce Fields out_put_write_access: 3780839ffb8SJ. Bruce Fields put_write_access(inode); 3790839ffb8SJ. Bruce Fields out_nfserrno: 3800839ffb8SJ. Bruce Fields return nfserrno(host_err); 3810839ffb8SJ. Bruce Fields } 3820839ffb8SJ. Bruce Fields 383818e5a22SChristoph Hellwig /* 384818e5a22SChristoph Hellwig * Set various file attributes. After this call fhp needs an fh_put. 3851da177e4SLinus Torvalds */ 3866264d69dSAl Viro __be32 3871da177e4SLinus Torvalds nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 3881da177e4SLinus Torvalds int check_guard, time_t guardtime) 3891da177e4SLinus Torvalds { 3901da177e4SLinus Torvalds struct dentry *dentry; 3911da177e4SLinus Torvalds struct inode *inode; 3928837abcaSMiklos Szeredi int accmode = NFSD_MAY_SATTR; 393175a4eb7SAl Viro umode_t ftype = 0; 3946264d69dSAl Viro __be32 err; 3956264d69dSAl Viro int host_err; 3969f67f189SJ. Bruce Fields bool get_write_count; 397758e99feSChristoph Hellwig bool size_change = (iap->ia_valid & ATTR_SIZE); 3981da177e4SLinus Torvalds 399*255fbca6Szhengbin if (iap->ia_valid & ATTR_SIZE) { 4008837abcaSMiklos Szeredi accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; 4011da177e4SLinus Torvalds ftype = S_IFREG; 402*255fbca6Szhengbin } 403*255fbca6Szhengbin 404*255fbca6Szhengbin /* 405*255fbca6Szhengbin * If utimes(2) and friends are called with times not NULL, we should 406*255fbca6Szhengbin * not set NFSD_MAY_WRITE bit. Otherwise fh_verify->nfsd_permission 407*255fbca6Szhengbin * will return EACCESS, when the caller's effective UID does not match 408*255fbca6Szhengbin * the owner of the file, and the caller is not privileged. In this 409*255fbca6Szhengbin * situation, we should return EPERM(notify_change will return this). 410*255fbca6Szhengbin */ 411*255fbca6Szhengbin if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME)) { 412*255fbca6Szhengbin accmode |= NFSD_MAY_OWNER_OVERRIDE; 413*255fbca6Szhengbin if (!(iap->ia_valid & (ATTR_ATIME_SET | ATTR_MTIME_SET))) 414*255fbca6Szhengbin accmode |= NFSD_MAY_WRITE; 415*255fbca6Szhengbin } 4161da177e4SLinus Torvalds 4179f67f189SJ. Bruce Fields /* Callers that do fh_verify should do the fh_want_write: */ 4189f67f189SJ. Bruce Fields get_write_count = !fhp->fh_dentry; 4199f67f189SJ. Bruce Fields 4201da177e4SLinus Torvalds /* Get inode */ 4211da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 42215b7a1b8SNeilBrown if (err) 423758e99feSChristoph Hellwig return err; 4249f67f189SJ. Bruce Fields if (get_write_count) { 4259f67f189SJ. Bruce Fields host_err = fh_want_write(fhp); 4269f67f189SJ. Bruce Fields if (host_err) 427758e99feSChristoph Hellwig goto out; 4289f67f189SJ. Bruce Fields } 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds dentry = fhp->fh_dentry; 4312b0143b5SDavid Howells inode = d_inode(dentry); 4321da177e4SLinus Torvalds 43315b7a1b8SNeilBrown /* Ignore any mode updates on symlinks */ 43415b7a1b8SNeilBrown if (S_ISLNK(inode->i_mode)) 43515b7a1b8SNeilBrown iap->ia_valid &= ~ATTR_MODE; 43615b7a1b8SNeilBrown 43715b7a1b8SNeilBrown if (!iap->ia_valid) 438758e99feSChristoph Hellwig return 0; 43915b7a1b8SNeilBrown 440818e5a22SChristoph Hellwig nfsd_sanitize_attrs(inode, iap); 4411da177e4SLinus Torvalds 442758e99feSChristoph Hellwig if (check_guard && guardtime != inode->i_ctime.tv_sec) 443758e99feSChristoph Hellwig return nfserr_notsync; 444758e99feSChristoph Hellwig 445f0c63124SChristoph Hellwig /* 44641f53350SChristoph Hellwig * The size case is special, it changes the file in addition to the 447783112f7SChristoph Hellwig * attributes, and file systems don't expect it to be mixed with 448783112f7SChristoph Hellwig * "random" attribute changes. We thus split out the size change 449783112f7SChristoph Hellwig * into a separate call to ->setattr, and do the rest as a separate 450783112f7SChristoph Hellwig * setattr call. 451f0c63124SChristoph Hellwig */ 452758e99feSChristoph Hellwig if (size_change) { 4530839ffb8SJ. Bruce Fields err = nfsd_get_write_access(rqstp, fhp, iap); 4540839ffb8SJ. Bruce Fields if (err) 455758e99feSChristoph Hellwig return err; 456783112f7SChristoph Hellwig } 45741f53350SChristoph Hellwig 458783112f7SChristoph Hellwig fh_lock(fhp); 459783112f7SChristoph Hellwig if (size_change) { 46041f53350SChristoph Hellwig /* 4610839ffb8SJ. Bruce Fields * RFC5661, Section 18.30.4: 4620839ffb8SJ. Bruce Fields * Changing the size of a file with SETATTR indirectly 4630839ffb8SJ. Bruce Fields * changes the time_modify and change attributes. 4640839ffb8SJ. Bruce Fields * 4650839ffb8SJ. Bruce Fields * (and similar for the older RFCs) 46641f53350SChristoph Hellwig */ 467783112f7SChristoph Hellwig struct iattr size_attr = { 468783112f7SChristoph Hellwig .ia_valid = ATTR_SIZE | ATTR_CTIME | ATTR_MTIME, 469783112f7SChristoph Hellwig .ia_size = iap->ia_size, 470783112f7SChristoph Hellwig }; 471783112f7SChristoph Hellwig 472783112f7SChristoph Hellwig host_err = notify_change(dentry, &size_attr, NULL); 473783112f7SChristoph Hellwig if (host_err) 474783112f7SChristoph Hellwig goto out_unlock; 475783112f7SChristoph Hellwig iap->ia_valid &= ~ATTR_SIZE; 476783112f7SChristoph Hellwig 477783112f7SChristoph Hellwig /* 478783112f7SChristoph Hellwig * Avoid the additional setattr call below if the only other 479783112f7SChristoph Hellwig * attribute that the client sends is the mtime, as we update 480783112f7SChristoph Hellwig * it as part of the size change above. 481783112f7SChristoph Hellwig */ 482783112f7SChristoph Hellwig if ((iap->ia_valid & ~ATTR_MTIME) == 0) 483783112f7SChristoph Hellwig goto out_unlock; 4841da177e4SLinus Torvalds } 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 48727ac0ffeSJ. Bruce Fields host_err = notify_change(dentry, iap, NULL); 488987da479SChristoph Hellwig 489783112f7SChristoph Hellwig out_unlock: 490783112f7SChristoph Hellwig fh_unlock(fhp); 4910839ffb8SJ. Bruce Fields if (size_change) 4920839ffb8SJ. Bruce Fields put_write_access(inode); 4930839ffb8SJ. Bruce Fields out: 494758e99feSChristoph Hellwig if (!host_err) 495758e99feSChristoph Hellwig host_err = commit_metadata(fhp); 496758e99feSChristoph Hellwig return nfserrno(host_err); 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds 4995be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V4) 5009b4146e8SChuck Lever /* 5019b4146e8SChuck Lever * NFS junction information is stored in an extended attribute. 5029b4146e8SChuck Lever */ 5039b4146e8SChuck Lever #define NFSD_JUNCTION_XATTR_NAME XATTR_TRUSTED_PREFIX "junction.nfs" 5049b4146e8SChuck Lever 5059b4146e8SChuck Lever /** 5069b4146e8SChuck Lever * nfsd4_is_junction - Test if an object could be an NFS junction 5079b4146e8SChuck Lever * 5089b4146e8SChuck Lever * @dentry: object to test 5099b4146e8SChuck Lever * 5109b4146e8SChuck Lever * Returns 1 if "dentry" appears to contain NFS junction information. 5119b4146e8SChuck Lever * Otherwise 0 is returned. 5129b4146e8SChuck Lever */ 51311fcee02STrond Myklebust int nfsd4_is_junction(struct dentry *dentry) 51411fcee02STrond Myklebust { 5152b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 51611fcee02STrond Myklebust 51711fcee02STrond Myklebust if (inode == NULL) 51811fcee02STrond Myklebust return 0; 51911fcee02STrond Myklebust if (inode->i_mode & S_IXUGO) 52011fcee02STrond Myklebust return 0; 52111fcee02STrond Myklebust if (!(inode->i_mode & S_ISVTX)) 52211fcee02STrond Myklebust return 0; 5239b4146e8SChuck Lever if (vfs_getxattr(dentry, NFSD_JUNCTION_XATTR_NAME, NULL, 0) <= 0) 52411fcee02STrond Myklebust return 0; 52511fcee02STrond Myklebust return 1; 52611fcee02STrond Myklebust } 52718032ca0SDavid Quigley #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 52818032ca0SDavid Quigley __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp, 52918032ca0SDavid Quigley struct xdr_netobj *label) 53018032ca0SDavid Quigley { 53118032ca0SDavid Quigley __be32 error; 53218032ca0SDavid Quigley int host_error; 53318032ca0SDavid Quigley struct dentry *dentry; 53418032ca0SDavid Quigley 53518032ca0SDavid Quigley error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); 53618032ca0SDavid Quigley if (error) 53718032ca0SDavid Quigley return error; 53818032ca0SDavid Quigley 53918032ca0SDavid Quigley dentry = fhp->fh_dentry; 54018032ca0SDavid Quigley 5415955102cSAl Viro inode_lock(d_inode(dentry)); 54218032ca0SDavid Quigley host_error = security_inode_setsecctx(dentry, label->data, label->len); 5435955102cSAl Viro inode_unlock(d_inode(dentry)); 54418032ca0SDavid Quigley return nfserrno(host_error); 54518032ca0SDavid Quigley } 54618032ca0SDavid Quigley #else 54718032ca0SDavid Quigley __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp, 54818032ca0SDavid Quigley struct xdr_netobj *label) 54918032ca0SDavid Quigley { 55018032ca0SDavid Quigley return nfserr_notsupp; 55118032ca0SDavid Quigley } 55218032ca0SDavid Quigley #endif 55318032ca0SDavid Quigley 554ffa0160aSChristoph Hellwig __be32 nfsd4_clone_file_range(struct file *src, u64 src_pos, struct file *dst, 555ffa0160aSChristoph Hellwig u64 dst_pos, u64 count) 556ffa0160aSChristoph Hellwig { 55742ec3d4cSDarrick J. Wong loff_t cloned; 55842ec3d4cSDarrick J. Wong 559452ce659SDarrick J. Wong cloned = vfs_clone_file_range(src, src_pos, dst, dst_pos, count, 0); 56042ec3d4cSDarrick J. Wong if (count && cloned != count) 56142ec3d4cSDarrick J. Wong cloned = -EINVAL; 56242ec3d4cSDarrick J. Wong return nfserrno(cloned < 0 ? cloned : 0); 563ffa0160aSChristoph Hellwig } 564ffa0160aSChristoph Hellwig 56529ae7f9dSAnna Schumaker ssize_t nfsd_copy_file_range(struct file *src, u64 src_pos, struct file *dst, 56629ae7f9dSAnna Schumaker u64 dst_pos, u64 count) 56729ae7f9dSAnna Schumaker { 56829ae7f9dSAnna Schumaker 56929ae7f9dSAnna Schumaker /* 57029ae7f9dSAnna Schumaker * Limit copy to 4MB to prevent indefinitely blocking an nfsd 57129ae7f9dSAnna Schumaker * thread and client rpc slot. The choice of 4MB is somewhat 57229ae7f9dSAnna Schumaker * arbitrary. We might instead base this on r/wsize, or make it 57329ae7f9dSAnna Schumaker * tunable, or use a time instead of a byte limit, or implement 57429ae7f9dSAnna Schumaker * asynchronous copy. In theory a client could also recognize a 57529ae7f9dSAnna Schumaker * limit like this and pipeline multiple COPY requests. 57629ae7f9dSAnna Schumaker */ 57729ae7f9dSAnna Schumaker count = min_t(u64, count, 1 << 22); 57829ae7f9dSAnna Schumaker return vfs_copy_file_range(src, src_pos, dst, dst_pos, count, 0); 57929ae7f9dSAnna Schumaker } 58029ae7f9dSAnna Schumaker 58195d871f0SAnna Schumaker __be32 nfsd4_vfs_fallocate(struct svc_rqst *rqstp, struct svc_fh *fhp, 58295d871f0SAnna Schumaker struct file *file, loff_t offset, loff_t len, 58395d871f0SAnna Schumaker int flags) 58495d871f0SAnna Schumaker { 58595d871f0SAnna Schumaker int error; 58695d871f0SAnna Schumaker 58795d871f0SAnna Schumaker if (!S_ISREG(file_inode(file)->i_mode)) 58895d871f0SAnna Schumaker return nfserr_inval; 58995d871f0SAnna Schumaker 59095d871f0SAnna Schumaker error = vfs_fallocate(file, flags, offset, len); 59195d871f0SAnna Schumaker if (!error) 59295d871f0SAnna Schumaker error = commit_metadata(fhp); 59395d871f0SAnna Schumaker 59495d871f0SAnna Schumaker return nfserrno(error); 59595d871f0SAnna Schumaker } 5966a85d6c7SJ. Bruce Fields #endif /* defined(CONFIG_NFSD_V4) */ 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 5991da177e4SLinus Torvalds /* 6001da177e4SLinus Torvalds * Check server access rights to a file system object 6011da177e4SLinus Torvalds */ 6021da177e4SLinus Torvalds struct accessmap { 6031da177e4SLinus Torvalds u32 access; 6041da177e4SLinus Torvalds int how; 6051da177e4SLinus Torvalds }; 6061da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 6078837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6088837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6098837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, 6108837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds { 0, 0 } 6131da177e4SLinus Torvalds }; 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 6168837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6178837abcaSMiklos Szeredi { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, 6188837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, 6198837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, 6208837abcaSMiklos Szeredi { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, 6211da177e4SLinus Torvalds 6221da177e4SLinus Torvalds { 0, 0 } 6231da177e4SLinus Torvalds }; 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 6261da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 6271da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 6281da177e4SLinus Torvalds * (which really, the server doesn't care about). So 6291da177e4SLinus Torvalds * We provide simple access checking for them, looking 6301da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 6311da177e4SLinus Torvalds * filesystem checks 6321da177e4SLinus Torvalds */ 6338837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6348837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6358837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6368837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6371da177e4SLinus Torvalds 6381da177e4SLinus Torvalds { 0, 0 } 6391da177e4SLinus Torvalds }; 6401da177e4SLinus Torvalds 6416264d69dSAl Viro __be32 6421da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 6431da177e4SLinus Torvalds { 6441da177e4SLinus Torvalds struct accessmap *map; 6451da177e4SLinus Torvalds struct svc_export *export; 6461da177e4SLinus Torvalds struct dentry *dentry; 6471da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 6486264d69dSAl Viro __be32 error; 6491da177e4SLinus Torvalds 6508837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 6511da177e4SLinus Torvalds if (error) 6521da177e4SLinus Torvalds goto out; 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvalds export = fhp->fh_export; 6551da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6561da177e4SLinus Torvalds 657e36cb0b8SDavid Howells if (d_is_reg(dentry)) 6581da177e4SLinus Torvalds map = nfs3_regaccess; 659e36cb0b8SDavid Howells else if (d_is_dir(dentry)) 6601da177e4SLinus Torvalds map = nfs3_diraccess; 6611da177e4SLinus Torvalds else 6621da177e4SLinus Torvalds map = nfs3_anyaccess; 6631da177e4SLinus Torvalds 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds query = *access; 6661da177e4SLinus Torvalds for (; map->access; map++) { 6671da177e4SLinus Torvalds if (map->access & query) { 6686264d69dSAl Viro __be32 err2; 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds sresult |= map->access; 6711da177e4SLinus Torvalds 6720ec757dfSJ. Bruce Fields err2 = nfsd_permission(rqstp, export, dentry, map->how); 6731da177e4SLinus Torvalds switch (err2) { 6741da177e4SLinus Torvalds case nfs_ok: 6751da177e4SLinus Torvalds result |= map->access; 6761da177e4SLinus Torvalds break; 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 6791da177e4SLinus Torvalds * rather than an error occurred */ 6801da177e4SLinus Torvalds case nfserr_rofs: 6811da177e4SLinus Torvalds case nfserr_acces: 6821da177e4SLinus Torvalds case nfserr_perm: 6831da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 6841da177e4SLinus Torvalds break; 6851da177e4SLinus Torvalds default: 6861da177e4SLinus Torvalds error = err2; 6871da177e4SLinus Torvalds goto out; 6881da177e4SLinus Torvalds } 6891da177e4SLinus Torvalds } 6901da177e4SLinus Torvalds } 6911da177e4SLinus Torvalds *access = result; 6921da177e4SLinus Torvalds if (supported) 6931da177e4SLinus Torvalds *supported = sresult; 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds out: 6961da177e4SLinus Torvalds return error; 6971da177e4SLinus Torvalds } 6981da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 6991da177e4SLinus Torvalds 700105f4622SJ. Bruce Fields static int nfsd_open_break_lease(struct inode *inode, int access) 701105f4622SJ. Bruce Fields { 702105f4622SJ. Bruce Fields unsigned int mode; 7031da177e4SLinus Torvalds 704105f4622SJ. Bruce Fields if (access & NFSD_MAY_NOT_BREAK_LEASE) 705105f4622SJ. Bruce Fields return 0; 706105f4622SJ. Bruce Fields mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; 707105f4622SJ. Bruce Fields return break_lease(inode, mode | O_NONBLOCK); 708105f4622SJ. Bruce Fields } 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds /* 7111da177e4SLinus Torvalds * Open an existing file or directory. 712999448a8SBernd Schubert * The may_flags argument indicates the type of open (read/write/lock) 713999448a8SBernd Schubert * and additional flags. 7141da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 7151da177e4SLinus Torvalds */ 7166264d69dSAl Viro __be32 717175a4eb7SAl Viro nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, 718999448a8SBernd Schubert int may_flags, struct file **filp) 7191da177e4SLinus Torvalds { 720765927b2SAl Viro struct path path; 7211da177e4SLinus Torvalds struct inode *inode; 7228519f994SKinglong Mee struct file *file; 7236264d69dSAl Viro int flags = O_RDONLY|O_LARGEFILE; 7246264d69dSAl Viro __be32 err; 72591885258SJeff Layton int host_err = 0; 7261da177e4SLinus Torvalds 727e0e81739SDavid Howells validate_process_creds(); 728e0e81739SDavid Howells 7291da177e4SLinus Torvalds /* 7301da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 7311da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 7321da177e4SLinus Torvalds * in case a chmod has now revoked permission. 733d91d0b56SJ. Bruce Fields * 734d91d0b56SJ. Bruce Fields * Arguably we should also allow the owner override for 735d91d0b56SJ. Bruce Fields * directories, but we never have and it doesn't seem to have 736d91d0b56SJ. Bruce Fields * caused anyone a problem. If we were to change this, note 737d91d0b56SJ. Bruce Fields * also that our filldir callbacks would need a variant of 738d91d0b56SJ. Bruce Fields * lookup_one_len that doesn't check permissions. 7391da177e4SLinus Torvalds */ 740d91d0b56SJ. Bruce Fields if (type == S_IFREG) 741d91d0b56SJ. Bruce Fields may_flags |= NFSD_MAY_OWNER_OVERRIDE; 742d91d0b56SJ. Bruce Fields err = fh_verify(rqstp, fhp, type, may_flags); 7431da177e4SLinus Torvalds if (err) 7441da177e4SLinus Torvalds goto out; 7451da177e4SLinus Torvalds 746765927b2SAl Viro path.mnt = fhp->fh_export->ex_path.mnt; 747765927b2SAl Viro path.dentry = fhp->fh_dentry; 7482b0143b5SDavid Howells inode = d_inode(path.dentry); 7491da177e4SLinus Torvalds 7501da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 7511da177e4SLinus Torvalds * or any access when mandatory locking enabled 7521da177e4SLinus Torvalds */ 7531da177e4SLinus Torvalds err = nfserr_perm; 754999448a8SBernd Schubert if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE)) 7551da177e4SLinus Torvalds goto out; 7565e7fc436SJ. Bruce Fields /* 7575e7fc436SJ. Bruce Fields * We must ignore files (but only files) which might have mandatory 7585e7fc436SJ. Bruce Fields * locks on them because there is no way to know if the accesser has 7595e7fc436SJ. Bruce Fields * the lock. 7605e7fc436SJ. Bruce Fields */ 7615e7fc436SJ. Bruce Fields if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) 7621da177e4SLinus Torvalds goto out; 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds if (!inode->i_fop) 7651da177e4SLinus Torvalds goto out; 7661da177e4SLinus Torvalds 767999448a8SBernd Schubert host_err = nfsd_open_break_lease(inode, may_flags); 7686264d69dSAl Viro if (host_err) /* NOMEM or WOULDBLOCK */ 7691da177e4SLinus Torvalds goto out_nfserr; 7701da177e4SLinus Torvalds 771999448a8SBernd Schubert if (may_flags & NFSD_MAY_WRITE) { 772999448a8SBernd Schubert if (may_flags & NFSD_MAY_READ) 7739ecb6a08SJ. Bruce Fields flags = O_RDWR|O_LARGEFILE; 7749ecb6a08SJ. Bruce Fields else 7751da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 7761da177e4SLinus Torvalds } 777999448a8SBernd Schubert 7788519f994SKinglong Mee file = dentry_open(&path, flags, current_cred()); 7798519f994SKinglong Mee if (IS_ERR(file)) { 7808519f994SKinglong Mee host_err = PTR_ERR(file); 7818519f994SKinglong Mee goto out_nfserr; 78206effdbbSBernd Schubert } 78306effdbbSBernd Schubert 7846035a27bSAl Viro host_err = ima_file_check(file, may_flags); 7858519f994SKinglong Mee if (host_err) { 786fd891454SChristoph Hellwig fput(file); 7878519f994SKinglong Mee goto out_nfserr; 7888519f994SKinglong Mee } 7898519f994SKinglong Mee 7908519f994SKinglong Mee if (may_flags & NFSD_MAY_64BIT_COOKIE) 7918519f994SKinglong Mee file->f_mode |= FMODE_64BITHASH; 7928519f994SKinglong Mee else 7938519f994SKinglong Mee file->f_mode |= FMODE_32BITHASH; 7948519f994SKinglong Mee 7958519f994SKinglong Mee *filp = file; 7961da177e4SLinus Torvalds out_nfserr: 7976264d69dSAl Viro err = nfserrno(host_err); 7981da177e4SLinus Torvalds out: 799e0e81739SDavid Howells validate_process_creds(); 8001da177e4SLinus Torvalds return err; 8011da177e4SLinus Torvalds } 8021da177e4SLinus Torvalds 803e749a462SChristoph Hellwig struct raparms * 804e749a462SChristoph Hellwig nfsd_init_raparms(struct file *file) 8051da177e4SLinus Torvalds { 806e749a462SChristoph Hellwig struct inode *inode = file_inode(file); 807e749a462SChristoph Hellwig dev_t dev = inode->i_sb->s_dev; 808e749a462SChristoph Hellwig ino_t ino = inode->i_ino; 8091da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 8101da177e4SLinus Torvalds int depth = 0; 811fce1456aSGreg Banks unsigned int hash; 812fce1456aSGreg Banks struct raparm_hbucket *rab; 8131da177e4SLinus Torvalds 814fce1456aSGreg Banks hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; 815fce1456aSGreg Banks rab = &raparm_hash[hash]; 816fce1456aSGreg Banks 817fce1456aSGreg Banks spin_lock(&rab->pb_lock); 818fce1456aSGreg Banks for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { 8191da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 8201da177e4SLinus Torvalds goto found; 8211da177e4SLinus Torvalds depth++; 8221da177e4SLinus Torvalds if (ra->p_count == 0) 8231da177e4SLinus Torvalds frap = rap; 8241da177e4SLinus Torvalds } 8253aa6e0aaSKonstantin Khorenko depth = nfsdstats.ra_size; 8261da177e4SLinus Torvalds if (!frap) { 827fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8281da177e4SLinus Torvalds return NULL; 8291da177e4SLinus Torvalds } 8301da177e4SLinus Torvalds rap = frap; 8311da177e4SLinus Torvalds ra = *frap; 8321da177e4SLinus Torvalds ra->p_dev = dev; 8331da177e4SLinus Torvalds ra->p_ino = ino; 8341da177e4SLinus Torvalds ra->p_set = 0; 835fce1456aSGreg Banks ra->p_hindex = hash; 8361da177e4SLinus Torvalds found: 837fce1456aSGreg Banks if (rap != &rab->pb_head) { 8381da177e4SLinus Torvalds *rap = ra->p_next; 839fce1456aSGreg Banks ra->p_next = rab->pb_head; 840fce1456aSGreg Banks rab->pb_head = ra; 8411da177e4SLinus Torvalds } 8421da177e4SLinus Torvalds ra->p_count++; 8431da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 844fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 845e749a462SChristoph Hellwig 846e749a462SChristoph Hellwig if (ra->p_set) 847e749a462SChristoph Hellwig file->f_ra = ra->p_ra; 8481da177e4SLinus Torvalds return ra; 8491da177e4SLinus Torvalds } 8501da177e4SLinus Torvalds 851e749a462SChristoph Hellwig void nfsd_put_raparams(struct file *file, struct raparms *ra) 852e749a462SChristoph Hellwig { 853e749a462SChristoph Hellwig struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; 854e749a462SChristoph Hellwig 855e749a462SChristoph Hellwig spin_lock(&rab->pb_lock); 856e749a462SChristoph Hellwig ra->p_ra = file->f_ra; 857e749a462SChristoph Hellwig ra->p_set = 1; 858e749a462SChristoph Hellwig ra->p_count--; 859e749a462SChristoph Hellwig spin_unlock(&rab->pb_lock); 860e749a462SChristoph Hellwig } 861e749a462SChristoph Hellwig 8621da177e4SLinus Torvalds /* 863cf8208d0SJens Axboe * Grab and keep cached pages associated with a file in the svc_rqst 864cf8208d0SJens Axboe * so that they can be passed to the network sendmsg/sendpage routines 865cf8208d0SJens Axboe * directly. They will be released after the sending has completed. 8661da177e4SLinus Torvalds */ 8671da177e4SLinus Torvalds static int 868cf8208d0SJens Axboe nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, 869cf8208d0SJens Axboe struct splice_desc *sd) 8701da177e4SLinus Torvalds { 871cf8208d0SJens Axboe struct svc_rqst *rqstp = sd->u.data; 872afc59400SJ. Bruce Fields struct page **pp = rqstp->rq_next_page; 873cf8208d0SJens Axboe struct page *page = buf->page; 874cf8208d0SJens Axboe size_t size; 875cf8208d0SJens Axboe 876cf8208d0SJens Axboe size = sd->len; 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 8791da177e4SLinus Torvalds get_page(page); 880afc59400SJ. Bruce Fields put_page(*rqstp->rq_next_page); 881afc59400SJ. Bruce Fields *(rqstp->rq_next_page++) = page; 882cf8208d0SJens Axboe rqstp->rq_res.page_base = buf->offset; 8831da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 88444524359SNeilBrown } else if (page != pp[-1]) { 8851da177e4SLinus Torvalds get_page(page); 886afc59400SJ. Bruce Fields if (*rqstp->rq_next_page) 887afc59400SJ. Bruce Fields put_page(*rqstp->rq_next_page); 888afc59400SJ. Bruce Fields *(rqstp->rq_next_page++) = page; 8891da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 89044524359SNeilBrown } else 8911da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8921da177e4SLinus Torvalds 8931da177e4SLinus Torvalds return size; 8941da177e4SLinus Torvalds } 8951da177e4SLinus Torvalds 896cf8208d0SJens Axboe static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, 897cf8208d0SJens Axboe struct splice_desc *sd) 898cf8208d0SJens Axboe { 899cf8208d0SJens Axboe return __splice_from_pipe(pipe, sd, nfsd_splice_actor); 900cf8208d0SJens Axboe } 901cf8208d0SJens Axboe 90287c5942eSChuck Lever static __be32 nfsd_finish_read(struct svc_rqst *rqstp, struct svc_fh *fhp, 90387c5942eSChuck Lever struct file *file, loff_t offset, 90487c5942eSChuck Lever unsigned long *count, int host_err) 9051da177e4SLinus Torvalds { 906dc97618dSJ. Bruce Fields if (host_err >= 0) { 907dc97618dSJ. Bruce Fields nfsdstats.io_read += host_err; 908dc97618dSJ. Bruce Fields *count = host_err; 909dc97618dSJ. Bruce Fields fsnotify_access(file); 91087c5942eSChuck Lever trace_nfsd_read_io_done(rqstp, fhp, offset, *count); 911dc97618dSJ. Bruce Fields return 0; 91287c5942eSChuck Lever } else { 91387c5942eSChuck Lever trace_nfsd_read_err(rqstp, fhp, offset, host_err); 914dc97618dSJ. Bruce Fields return nfserrno(host_err); 915dc97618dSJ. Bruce Fields } 91687c5942eSChuck Lever } 9171da177e4SLinus Torvalds 91887c5942eSChuck Lever __be32 nfsd_splice_read(struct svc_rqst *rqstp, struct svc_fh *fhp, 919dc97618dSJ. Bruce Fields struct file *file, loff_t offset, unsigned long *count) 920dc97618dSJ. Bruce Fields { 921cf8208d0SJens Axboe struct splice_desc sd = { 922cf8208d0SJens Axboe .len = 0, 923cf8208d0SJens Axboe .total_len = *count, 924cf8208d0SJens Axboe .pos = offset, 925cf8208d0SJens Axboe .u.data = rqstp, 926cf8208d0SJens Axboe }; 927dc97618dSJ. Bruce Fields int host_err; 928cf8208d0SJens Axboe 92987c5942eSChuck Lever trace_nfsd_read_splice(rqstp, fhp, offset, *count); 930afc59400SJ. Bruce Fields rqstp->rq_next_page = rqstp->rq_respages + 1; 931cf8208d0SJens Axboe host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); 93287c5942eSChuck Lever return nfsd_finish_read(rqstp, fhp, file, offset, count, host_err); 933dc97618dSJ. Bruce Fields } 934dc97618dSJ. Bruce Fields 93587c5942eSChuck Lever __be32 nfsd_readv(struct svc_rqst *rqstp, struct svc_fh *fhp, 93687c5942eSChuck Lever struct file *file, loff_t offset, 93787c5942eSChuck Lever struct kvec *vec, int vlen, unsigned long *count) 938dc97618dSJ. Bruce Fields { 93973da852eSChristoph Hellwig struct iov_iter iter; 940dc97618dSJ. Bruce Fields int host_err; 941dc97618dSJ. Bruce Fields 94287c5942eSChuck Lever trace_nfsd_read_vector(rqstp, fhp, offset, *count); 943aa563d7bSDavid Howells iov_iter_kvec(&iter, READ, vec, vlen, *count); 94473da852eSChristoph Hellwig host_err = vfs_iter_read(file, &iter, &offset, 0); 94587c5942eSChuck Lever return nfsd_finish_read(rqstp, fhp, file, offset, count, host_err); 9461da177e4SLinus Torvalds } 9471da177e4SLinus Torvalds 948d911df7bSJ. Bruce Fields /* 949d911df7bSJ. Bruce Fields * Gathered writes: If another process is currently writing to the file, 950d911df7bSJ. Bruce Fields * there's a high chance this is another nfsd (triggered by a bulk write 951d911df7bSJ. Bruce Fields * from a client's biod). Rather than syncing the file with each write 952d911df7bSJ. Bruce Fields * request, we sleep for 10 msec. 953d911df7bSJ. Bruce Fields * 954d911df7bSJ. Bruce Fields * I don't know if this roughly approximates C. Juszak's idea of 955d911df7bSJ. Bruce Fields * gathered writes, but it's a nice and simple solution (IMHO), and it 956d911df7bSJ. Bruce Fields * seems to work:-) 957d911df7bSJ. Bruce Fields * 958d911df7bSJ. Bruce Fields * Note: we do this only in the NFSv2 case, since v3 and higher have a 959d911df7bSJ. Bruce Fields * better tool (separate unstable writes and commits) for solving this 960d911df7bSJ. Bruce Fields * problem. 961d911df7bSJ. Bruce Fields */ 962d911df7bSJ. Bruce Fields static int wait_for_concurrent_writes(struct file *file) 963d911df7bSJ. Bruce Fields { 964496ad9aaSAl Viro struct inode *inode = file_inode(file); 965d911df7bSJ. Bruce Fields static ino_t last_ino; 966d911df7bSJ. Bruce Fields static dev_t last_dev; 967d911df7bSJ. Bruce Fields int err = 0; 968d911df7bSJ. Bruce Fields 969d911df7bSJ. Bruce Fields if (atomic_read(&inode->i_writecount) > 1 970d911df7bSJ. Bruce Fields || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 971d911df7bSJ. Bruce Fields dprintk("nfsd: write defer %d\n", task_pid_nr(current)); 972d911df7bSJ. Bruce Fields msleep(10); 973d911df7bSJ. Bruce Fields dprintk("nfsd: write resume %d\n", task_pid_nr(current)); 974d911df7bSJ. Bruce Fields } 975d911df7bSJ. Bruce Fields 976d911df7bSJ. Bruce Fields if (inode->i_state & I_DIRTY) { 977d911df7bSJ. Bruce Fields dprintk("nfsd: write sync %d\n", task_pid_nr(current)); 9788018ab05SChristoph Hellwig err = vfs_fsync(file, 0); 979d911df7bSJ. Bruce Fields } 980d911df7bSJ. Bruce Fields last_ino = inode->i_ino; 981d911df7bSJ. Bruce Fields last_dev = inode->i_sb->s_dev; 982d911df7bSJ. Bruce Fields return err; 983d911df7bSJ. Bruce Fields } 984d911df7bSJ. Bruce Fields 985af90f707SChristoph Hellwig __be32 9861da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 9871da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 98854bbb7d2SKinglong Mee unsigned long *cnt, int stable) 9891da177e4SLinus Torvalds { 9901da177e4SLinus Torvalds struct svc_export *exp; 99173da852eSChristoph Hellwig struct iov_iter iter; 992d890be15SChuck Lever __be32 nfserr; 9936264d69dSAl Viro int host_err; 99448e03bc5STrond Myklebust int use_wgather; 995e49dbbf3SKent Overstreet loff_t pos = offset; 9968658452eSNeilBrown unsigned int pflags = current->flags; 997ddef7ed2SChristoph Hellwig rwf_t flags = 0; 9988658452eSNeilBrown 999d890be15SChuck Lever trace_nfsd_write_opened(rqstp, fhp, offset, *cnt); 1000d890be15SChuck Lever 10017501cc2bSJeff Layton if (test_bit(RQ_LOCAL, &rqstp->rq_flags)) 10028658452eSNeilBrown /* 10038658452eSNeilBrown * We want less throttling in balance_dirty_pages() 10048658452eSNeilBrown * and shrink_inactive_list() so that nfs to 10058658452eSNeilBrown * localhost doesn't cause nfsd to lock up due to all 10068658452eSNeilBrown * the client's dirty pages or its congested queue. 10078658452eSNeilBrown */ 10088658452eSNeilBrown current->flags |= PF_LESS_THROTTLE; 10091da177e4SLinus Torvalds 10101da177e4SLinus Torvalds exp = fhp->fh_export; 101148e03bc5STrond Myklebust use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); 10121da177e4SLinus Torvalds 10131da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 101454bbb7d2SKinglong Mee stable = NFS_UNSTABLE; 10151da177e4SLinus Torvalds 101624368aadSChristoph Hellwig if (stable && !use_wgather) 101724368aadSChristoph Hellwig flags |= RWF_SYNC; 101824368aadSChristoph Hellwig 1019aa563d7bSDavid Howells iov_iter_kvec(&iter, WRITE, vec, vlen, *cnt); 102073da852eSChristoph Hellwig host_err = vfs_iter_write(file, &iter, &pos, flags); 1021e4636d53SJ. Bruce Fields if (host_err < 0) 1022e4636d53SJ. Bruce Fields goto out_nfserr; 1023d890be15SChuck Lever nfsdstats.io_write += *cnt; 10242a12a9d7SEric Paris fsnotify_modify(file); 10251da177e4SLinus Torvalds 102624368aadSChristoph Hellwig if (stable && use_wgather) 1027d911df7bSJ. Bruce Fields host_err = wait_for_concurrent_writes(file); 10281da177e4SLinus Torvalds 1029e4636d53SJ. Bruce Fields out_nfserr: 1030d890be15SChuck Lever if (host_err >= 0) { 1031d890be15SChuck Lever trace_nfsd_write_io_done(rqstp, fhp, offset, *cnt); 1032d890be15SChuck Lever nfserr = nfs_ok; 1033d890be15SChuck Lever } else { 1034d890be15SChuck Lever trace_nfsd_write_err(rqstp, fhp, offset, host_err); 1035d890be15SChuck Lever nfserr = nfserrno(host_err); 1036d890be15SChuck Lever } 10377501cc2bSJeff Layton if (test_bit(RQ_LOCAL, &rqstp->rq_flags)) 1038717a94b5SNeilBrown current_restore_flags(pflags, PF_LESS_THROTTLE); 1039d890be15SChuck Lever return nfserr; 10401da177e4SLinus Torvalds } 10411da177e4SLinus Torvalds 1042dc97618dSJ. Bruce Fields /* 1043dc97618dSJ. Bruce Fields * Read data from a file. count must contain the requested read count 1044dc97618dSJ. Bruce Fields * on entry. On return, *count contains the number of bytes actually read. 1045dc97618dSJ. Bruce Fields * N.B. After this call fhp needs an fh_put 1046dc97618dSJ. Bruce Fields */ 1047dc97618dSJ. Bruce Fields __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, 1048dc97618dSJ. Bruce Fields loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 1049dc97618dSJ. Bruce Fields { 1050dc97618dSJ. Bruce Fields struct file *file; 1051dc97618dSJ. Bruce Fields struct raparms *ra; 1052dc97618dSJ. Bruce Fields __be32 err; 1053dc97618dSJ. Bruce Fields 1054f394b62bSChuck Lever trace_nfsd_read_start(rqstp, fhp, offset, *count); 1055e749a462SChristoph Hellwig err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 1056dc97618dSJ. Bruce Fields if (err) 1057dc97618dSJ. Bruce Fields return err; 1058dc97618dSJ. Bruce Fields 1059e749a462SChristoph Hellwig ra = nfsd_init_raparms(file); 10606e8b50d1SJeff Layton 1061a4058c5bSChristoph Hellwig if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &rqstp->rq_flags)) 106287c5942eSChuck Lever err = nfsd_splice_read(rqstp, fhp, file, offset, count); 1063a4058c5bSChristoph Hellwig else 106487c5942eSChuck Lever err = nfsd_readv(rqstp, fhp, file, offset, vec, vlen, count); 10656e8b50d1SJeff Layton 1066e749a462SChristoph Hellwig if (ra) 1067e749a462SChristoph Hellwig nfsd_put_raparams(file, ra); 1068e749a462SChristoph Hellwig fput(file); 1069dc97618dSJ. Bruce Fields 1070f394b62bSChuck Lever trace_nfsd_read_done(rqstp, fhp, offset, *count); 10716e8b50d1SJeff Layton 1072fa0a2126SJ. Bruce Fields return err; 1073fa0a2126SJ. Bruce Fields } 1074fa0a2126SJ. Bruce Fields 10751da177e4SLinus Torvalds /* 10761da177e4SLinus Torvalds * Write data to a file. 10771da177e4SLinus Torvalds * The stable flag requests synchronous writes. 10781da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10791da177e4SLinus Torvalds */ 10806264d69dSAl Viro __be32 108152e380e0SKinglong Mee nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t offset, 108252e380e0SKinglong Mee struct kvec *vec, int vlen, unsigned long *cnt, int stable) 10831da177e4SLinus Torvalds { 108452e380e0SKinglong Mee struct file *file = NULL; 10856264d69dSAl Viro __be32 err = 0; 10861da177e4SLinus Torvalds 1087f394b62bSChuck Lever trace_nfsd_write_start(rqstp, fhp, offset, *cnt); 10886e8b50d1SJeff Layton 10898837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 10901da177e4SLinus Torvalds if (err) 10911da177e4SLinus Torvalds goto out; 10921da177e4SLinus Torvalds 109352e380e0SKinglong Mee err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, stable); 1094fd891454SChristoph Hellwig fput(file); 10951da177e4SLinus Torvalds out: 1096f394b62bSChuck Lever trace_nfsd_write_done(rqstp, fhp, offset, *cnt); 10971da177e4SLinus Torvalds return err; 10981da177e4SLinus Torvalds } 10991da177e4SLinus Torvalds 11001da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 11011da177e4SLinus Torvalds /* 11021da177e4SLinus Torvalds * Commit all pending writes to stable storage. 1103aa696a6fSTrond Myklebust * 1104aa696a6fSTrond Myklebust * Note: we only guarantee that data that lies within the range specified 1105aa696a6fSTrond Myklebust * by the 'offset' and 'count' parameters will be synced. 11061da177e4SLinus Torvalds * 11071da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 11081da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 11091da177e4SLinus Torvalds */ 11106264d69dSAl Viro __be32 11111da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 11121da177e4SLinus Torvalds loff_t offset, unsigned long count) 11131da177e4SLinus Torvalds { 11141da177e4SLinus Torvalds struct file *file; 1115aa696a6fSTrond Myklebust loff_t end = LLONG_MAX; 1116aa696a6fSTrond Myklebust __be32 err = nfserr_inval; 11171da177e4SLinus Torvalds 1118aa696a6fSTrond Myklebust if (offset < 0) 1119aa696a6fSTrond Myklebust goto out; 1120aa696a6fSTrond Myklebust if (count != 0) { 1121aa696a6fSTrond Myklebust end = offset + (loff_t)count - 1; 1122aa696a6fSTrond Myklebust if (end < offset) 1123aa696a6fSTrond Myklebust goto out; 1124aa696a6fSTrond Myklebust } 11251da177e4SLinus Torvalds 112691885258SJeff Layton err = nfsd_open(rqstp, fhp, S_IFREG, 112791885258SJeff Layton NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file); 11288837abcaSMiklos Szeredi if (err) 1129aa696a6fSTrond Myklebust goto out; 11301da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 11318018ab05SChristoph Hellwig int err2 = vfs_fsync_range(file, offset, end, 0); 1132aa696a6fSTrond Myklebust 1133aa696a6fSTrond Myklebust if (err2 != -EINVAL) 1134aa696a6fSTrond Myklebust err = nfserrno(err2); 1135aa696a6fSTrond Myklebust else 11361da177e4SLinus Torvalds err = nfserr_notsupp; 11371da177e4SLinus Torvalds } 11381da177e4SLinus Torvalds 1139fd891454SChristoph Hellwig fput(file); 1140aa696a6fSTrond Myklebust out: 11411da177e4SLinus Torvalds return err; 11421da177e4SLinus Torvalds } 11431da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 11441da177e4SLinus Torvalds 1145f2b0dee2SAdrian Bunk static __be32 11465c002b3bSJ. Bruce Fields nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, 11475c002b3bSJ. Bruce Fields struct iattr *iap) 11485c002b3bSJ. Bruce Fields { 11495c002b3bSJ. Bruce Fields /* 11505c002b3bSJ. Bruce Fields * Mode has already been set earlier in create: 11515c002b3bSJ. Bruce Fields */ 11525c002b3bSJ. Bruce Fields iap->ia_valid &= ~ATTR_MODE; 11535c002b3bSJ. Bruce Fields /* 11545c002b3bSJ. Bruce Fields * Setting uid/gid works only for root. Irix appears to 11555c002b3bSJ. Bruce Fields * send along the gid on create when it tries to implement 11565c002b3bSJ. Bruce Fields * setgid directories via NFS: 11575c002b3bSJ. Bruce Fields */ 11586fab8779SEric W. Biederman if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) 11595c002b3bSJ. Bruce Fields iap->ia_valid &= ~(ATTR_UID|ATTR_GID); 11605c002b3bSJ. Bruce Fields if (iap->ia_valid) 11615c002b3bSJ. Bruce Fields return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 11620f3a24b4STrond Myklebust /* Callers expect file metadata to be committed here */ 1163722b620dSJeff Layton return nfserrno(commit_metadata(resfhp)); 11645c002b3bSJ. Bruce Fields } 11655c002b3bSJ. Bruce Fields 11664ac35c2fSwengang wang /* HPUX client sometimes creates a file in mode 000, and sets size to 0. 11674ac35c2fSwengang wang * setting size to 0 may fail for some specific file systems by the permission 11684ac35c2fSwengang wang * checking which requires WRITE permission but the mode is 000. 11694ac35c2fSwengang wang * we ignore the resizing(to 0) on the just new created file, since the size is 11704ac35c2fSwengang wang * 0 after file created. 11714ac35c2fSwengang wang * 11724ac35c2fSwengang wang * call this only after vfs_create() is called. 11734ac35c2fSwengang wang * */ 11744ac35c2fSwengang wang static void 11754ac35c2fSwengang wang nfsd_check_ignore_resizing(struct iattr *iap) 11764ac35c2fSwengang wang { 11774ac35c2fSwengang wang if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) 11784ac35c2fSwengang wang iap->ia_valid &= ~ATTR_SIZE; 11794ac35c2fSwengang wang } 11804ac35c2fSwengang wang 1181b44061d0SJ. Bruce Fields /* The parent directory should already be locked: */ 11826264d69dSAl Viro __be32 1183b44061d0SJ. Bruce Fields nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp, 11841da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 11851da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 11861da177e4SLinus Torvalds { 11872b118859SDan Carpenter struct dentry *dentry, *dchild; 11881da177e4SLinus Torvalds struct inode *dirp; 11896264d69dSAl Viro __be32 err; 11905c002b3bSJ. Bruce Fields __be32 err2; 11916264d69dSAl Viro int host_err; 11921da177e4SLinus Torvalds 11931da177e4SLinus Torvalds dentry = fhp->fh_dentry; 11942b0143b5SDavid Howells dirp = d_inode(dentry); 11951da177e4SLinus Torvalds 11961da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 11971da177e4SLinus Torvalds if (!fhp->fh_locked) { 1198b44061d0SJ. Bruce Fields WARN_ONCE(1, "nfsd_create: parent %pd2 not locked!\n", 1199a6a9f18fSAl Viro dentry); 1200d75f2b9fSAl Viro err = nfserr_io; 12011da177e4SLinus Torvalds goto out; 12021da177e4SLinus Torvalds } 12031da177e4SLinus Torvalds 12047eed34f1SOleg Drokin err = nfsd_permission(rqstp, fhp->fh_export, dentry, NFSD_MAY_CREATE); 12057eed34f1SOleg Drokin if (err) 12067eed34f1SOleg Drokin goto out; 12077eed34f1SOleg Drokin 12081da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 12091da177e4SLinus Torvalds iap->ia_mode = 0; 12101da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 12111da177e4SLinus Torvalds 1212088406bcSJ. Bruce Fields err = 0; 12134a55c101SJan Kara host_err = 0; 12141da177e4SLinus Torvalds switch (type) { 12151da177e4SLinus Torvalds case S_IFREG: 1216312b63fbSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, true); 12174ac35c2fSwengang wang if (!host_err) 12184ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 12191da177e4SLinus Torvalds break; 12201da177e4SLinus Torvalds case S_IFDIR: 12216264d69dSAl Viro host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); 12223819bb0dSAl Viro if (!host_err && unlikely(d_unhashed(dchild))) { 12233819bb0dSAl Viro struct dentry *d; 12243819bb0dSAl Viro d = lookup_one_len(dchild->d_name.name, 12253819bb0dSAl Viro dchild->d_parent, 12263819bb0dSAl Viro dchild->d_name.len); 12273819bb0dSAl Viro if (IS_ERR(d)) { 12283819bb0dSAl Viro host_err = PTR_ERR(d); 12293819bb0dSAl Viro break; 12303819bb0dSAl Viro } 12313819bb0dSAl Viro if (unlikely(d_is_negative(d))) { 12323819bb0dSAl Viro dput(d); 12333819bb0dSAl Viro err = nfserr_serverfault; 12343819bb0dSAl Viro goto out; 12353819bb0dSAl Viro } 12363819bb0dSAl Viro dput(resfhp->fh_dentry); 12373819bb0dSAl Viro resfhp->fh_dentry = dget(d); 12383819bb0dSAl Viro err = fh_update(resfhp); 12393819bb0dSAl Viro dput(dchild); 12403819bb0dSAl Viro dchild = d; 12413819bb0dSAl Viro if (err) 12423819bb0dSAl Viro goto out; 12433819bb0dSAl Viro } 12441da177e4SLinus Torvalds break; 12451da177e4SLinus Torvalds case S_IFCHR: 12461da177e4SLinus Torvalds case S_IFBLK: 12471da177e4SLinus Torvalds case S_IFIFO: 12481da177e4SLinus Torvalds case S_IFSOCK: 12496264d69dSAl Viro host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 12501da177e4SLinus Torvalds break; 125171423274SJ. Bruce Fields default: 125271423274SJ. Bruce Fields printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", 125371423274SJ. Bruce Fields type); 125471423274SJ. Bruce Fields host_err = -EINVAL; 1255463c3197SDave Hansen } 12564a55c101SJan Kara if (host_err < 0) 1257463c3197SDave Hansen goto out_nfserr; 12581da177e4SLinus Torvalds 1259f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 12601da177e4SLinus Torvalds 1261f501912aSBen Myers /* 12620f3a24b4STrond Myklebust * nfsd_create_setattr already committed the child. Transactional 12630f3a24b4STrond Myklebust * filesystems had a chance to commit changes for both parent and 1264b44061d0SJ. Bruce Fields * child simultaneously making the following commit_metadata a 12650f3a24b4STrond Myklebust * noop. 1266f501912aSBen Myers */ 1267f501912aSBen Myers err2 = nfserrno(commit_metadata(fhp)); 1268f193fbabSYAMAMOTO Takashi if (err2) 1269f193fbabSYAMAMOTO Takashi err = err2; 12701da177e4SLinus Torvalds /* 12711da177e4SLinus Torvalds * Update the file handle to get the new inode info. 12721da177e4SLinus Torvalds */ 12731da177e4SLinus Torvalds if (!err) 12741da177e4SLinus Torvalds err = fh_update(resfhp); 12751da177e4SLinus Torvalds out: 12761da177e4SLinus Torvalds dput(dchild); 12771da177e4SLinus Torvalds return err; 12781da177e4SLinus Torvalds 12791da177e4SLinus Torvalds out_nfserr: 12806264d69dSAl Viro err = nfserrno(host_err); 12811da177e4SLinus Torvalds goto out; 12821da177e4SLinus Torvalds } 12831da177e4SLinus Torvalds 1284b44061d0SJ. Bruce Fields /* 1285b44061d0SJ. Bruce Fields * Create a filesystem object (regular, directory, special). 1286b44061d0SJ. Bruce Fields * Note that the parent directory is left locked. 1287b44061d0SJ. Bruce Fields * 1288b44061d0SJ. Bruce Fields * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 1289b44061d0SJ. Bruce Fields */ 1290b44061d0SJ. Bruce Fields __be32 1291b44061d0SJ. Bruce Fields nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 1292b44061d0SJ. Bruce Fields char *fname, int flen, struct iattr *iap, 1293b44061d0SJ. Bruce Fields int type, dev_t rdev, struct svc_fh *resfhp) 1294b44061d0SJ. Bruce Fields { 1295b44061d0SJ. Bruce Fields struct dentry *dentry, *dchild = NULL; 1296b44061d0SJ. Bruce Fields __be32 err; 1297b44061d0SJ. Bruce Fields int host_err; 1298b44061d0SJ. Bruce Fields 1299b44061d0SJ. Bruce Fields if (isdotent(fname, flen)) 1300b44061d0SJ. Bruce Fields return nfserr_exist; 1301b44061d0SJ. Bruce Fields 1302fa08139dSJ. Bruce Fields err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_NOP); 1303b44061d0SJ. Bruce Fields if (err) 1304b44061d0SJ. Bruce Fields return err; 1305b44061d0SJ. Bruce Fields 1306b44061d0SJ. Bruce Fields dentry = fhp->fh_dentry; 1307b44061d0SJ. Bruce Fields 1308b44061d0SJ. Bruce Fields host_err = fh_want_write(fhp); 1309b44061d0SJ. Bruce Fields if (host_err) 1310b44061d0SJ. Bruce Fields return nfserrno(host_err); 1311b44061d0SJ. Bruce Fields 1312b44061d0SJ. Bruce Fields fh_lock_nested(fhp, I_MUTEX_PARENT); 1313b44061d0SJ. Bruce Fields dchild = lookup_one_len(fname, dentry, flen); 1314b44061d0SJ. Bruce Fields host_err = PTR_ERR(dchild); 1315b44061d0SJ. Bruce Fields if (IS_ERR(dchild)) 1316b44061d0SJ. Bruce Fields return nfserrno(host_err); 1317b44061d0SJ. Bruce Fields err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 1318502aa0a5SJosef Bacik /* 1319502aa0a5SJosef Bacik * We unconditionally drop our ref to dchild as fh_compose will have 1320502aa0a5SJosef Bacik * already grabbed its own ref for it. 1321502aa0a5SJosef Bacik */ 1322b44061d0SJ. Bruce Fields dput(dchild); 1323502aa0a5SJosef Bacik if (err) 1324b44061d0SJ. Bruce Fields return err; 1325b44061d0SJ. Bruce Fields return nfsd_create_locked(rqstp, fhp, fname, flen, iap, type, 1326b44061d0SJ. Bruce Fields rdev, resfhp); 1327b44061d0SJ. Bruce Fields } 1328b44061d0SJ. Bruce Fields 13291da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 1330ac6721a1SMi Jinlong 13311da177e4SLinus Torvalds /* 1332ac6721a1SMi Jinlong * NFSv3 and NFSv4 version of nfsd_create 13331da177e4SLinus Torvalds */ 13346264d69dSAl Viro __be32 1335ac6721a1SMi Jinlong do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 13361da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 13371da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 1338856121b2SJ. Bruce Fields bool *truncp, bool *created) 13391da177e4SLinus Torvalds { 13401da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 13411da177e4SLinus Torvalds struct inode *dirp; 13426264d69dSAl Viro __be32 err; 13436264d69dSAl Viro int host_err; 13441da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 13451da177e4SLinus Torvalds 13461da177e4SLinus Torvalds err = nfserr_perm; 13471da177e4SLinus Torvalds if (!flen) 13481da177e4SLinus Torvalds goto out; 13491da177e4SLinus Torvalds err = nfserr_exist; 13501da177e4SLinus Torvalds if (isdotent(fname, flen)) 13511da177e4SLinus Torvalds goto out; 13521da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 13531da177e4SLinus Torvalds iap->ia_mode = 0; 13541574dff8SSachin Prabhu err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 13551da177e4SLinus Torvalds if (err) 13561da177e4SLinus Torvalds goto out; 13571da177e4SLinus Torvalds 13581da177e4SLinus Torvalds dentry = fhp->fh_dentry; 13592b0143b5SDavid Howells dirp = d_inode(dentry); 13601da177e4SLinus Torvalds 13614a55c101SJan Kara host_err = fh_want_write(fhp); 13624a55c101SJan Kara if (host_err) 13634a55c101SJan Kara goto out_nfserr; 13644a55c101SJan Kara 136512fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 13661da177e4SLinus Torvalds 13671da177e4SLinus Torvalds /* 13681da177e4SLinus Torvalds * Compose the response file handle. 13691da177e4SLinus Torvalds */ 13701da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 13716264d69dSAl Viro host_err = PTR_ERR(dchild); 13721da177e4SLinus Torvalds if (IS_ERR(dchild)) 13731da177e4SLinus Torvalds goto out_nfserr; 13741da177e4SLinus Torvalds 13751574dff8SSachin Prabhu /* If file doesn't exist, check for permissions to create one */ 13762b0143b5SDavid Howells if (d_really_is_negative(dchild)) { 13771574dff8SSachin Prabhu err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 13781574dff8SSachin Prabhu if (err) 13791574dff8SSachin Prabhu goto out; 13801574dff8SSachin Prabhu } 13811574dff8SSachin Prabhu 13821da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 13831da177e4SLinus Torvalds if (err) 13841da177e4SLinus Torvalds goto out; 13851da177e4SLinus Torvalds 1386ac6721a1SMi Jinlong if (nfsd_create_is_exclusive(createmode)) { 1387c397852cSPeter Staubach /* solaris7 gets confused (bugid 4218508) if these have 1388749997e5SJeff Layton * the high bit set, so just clear the high bits. If this is 1389749997e5SJeff Layton * ever changed to use different attrs for storing the 1390749997e5SJeff Layton * verifier, then do_open_lookup() will also need to be fixed 1391749997e5SJeff Layton * accordingly. 13921da177e4SLinus Torvalds */ 13931da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 13941da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 13951da177e4SLinus Torvalds } 13961da177e4SLinus Torvalds 13972b0143b5SDavid Howells if (d_really_is_positive(dchild)) { 13981da177e4SLinus Torvalds err = 0; 13991da177e4SLinus Torvalds 14001da177e4SLinus Torvalds switch (createmode) { 14011da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 1402e36cb0b8SDavid Howells if (! d_is_reg(dchild)) 14039dc4e6c4SJ. Bruce Fields goto out; 14041da177e4SLinus Torvalds else if (truncp) { 14051da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 14061da177e4SLinus Torvalds * differently. we don't want to truncate the 14071da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 14081da177e4SLinus Torvalds * fails for some other reason. furthermore, 14091da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 14101da177e4SLinus Torvalds * according to spec! 14111da177e4SLinus Torvalds */ 14121da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 14131da177e4SLinus Torvalds } 14141da177e4SLinus Torvalds else { 14151da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 14161da177e4SLinus Torvalds goto set_attr; 14171da177e4SLinus Torvalds } 14181da177e4SLinus Torvalds break; 14191da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 14202b0143b5SDavid Howells if ( d_inode(dchild)->i_mtime.tv_sec == v_mtime 14212b0143b5SDavid Howells && d_inode(dchild)->i_atime.tv_sec == v_atime 14222b0143b5SDavid Howells && d_inode(dchild)->i_size == 0 ) { 14237007c90fSNeil Brown if (created) 14247007c90fSNeil Brown *created = 1; 14251da177e4SLinus Torvalds break; 14267007c90fSNeil Brown } 14270ac203cbSGustavo A. R. Silva /* fall through */ 1428ac6721a1SMi Jinlong case NFS4_CREATE_EXCLUSIVE4_1: 14292b0143b5SDavid Howells if ( d_inode(dchild)->i_mtime.tv_sec == v_mtime 14302b0143b5SDavid Howells && d_inode(dchild)->i_atime.tv_sec == v_atime 14312b0143b5SDavid Howells && d_inode(dchild)->i_size == 0 ) { 14327007c90fSNeil Brown if (created) 14337007c90fSNeil Brown *created = 1; 1434ac6721a1SMi Jinlong goto set_attr; 14357007c90fSNeil Brown } 14360ac203cbSGustavo A. R. Silva /* fall through */ 14371da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 14381da177e4SLinus Torvalds err = nfserr_exist; 14391da177e4SLinus Torvalds } 1440bad0dcffSAl Viro fh_drop_write(fhp); 14411da177e4SLinus Torvalds goto out; 14421da177e4SLinus Torvalds } 14431da177e4SLinus Torvalds 1444312b63fbSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, true); 1445463c3197SDave Hansen if (host_err < 0) { 1446bad0dcffSAl Viro fh_drop_write(fhp); 14471da177e4SLinus Torvalds goto out_nfserr; 1448463c3197SDave Hansen } 144981ac95c5SJ. Bruce Fields if (created) 145081ac95c5SJ. Bruce Fields *created = 1; 14511da177e4SLinus Torvalds 14524ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 14534ac35c2fSwengang wang 1454ac6721a1SMi Jinlong if (nfsd_create_is_exclusive(createmode)) { 1455c397852cSPeter Staubach /* Cram the verifier into atime/mtime */ 14561da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 1457c397852cSPeter Staubach | ATTR_MTIME_SET|ATTR_ATIME_SET; 14581da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 14591da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 14601da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 14611da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 14621da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 14631da177e4SLinus Torvalds } 14641da177e4SLinus Torvalds 14651da177e4SLinus Torvalds set_attr: 1466f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 1467f501912aSBen Myers 1468f501912aSBen Myers /* 14690f3a24b4STrond Myklebust * nfsd_create_setattr already committed the child 14700f3a24b4STrond Myklebust * (and possibly also the parent). 1471f501912aSBen Myers */ 1472f501912aSBen Myers if (!err) 1473f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 1474f193fbabSYAMAMOTO Takashi 1475f193fbabSYAMAMOTO Takashi /* 1476f193fbabSYAMAMOTO Takashi * Update the filehandle to get the new inode info. 1477f193fbabSYAMAMOTO Takashi */ 1478f193fbabSYAMAMOTO Takashi if (!err) 1479f193fbabSYAMAMOTO Takashi err = fh_update(resfhp); 14801da177e4SLinus Torvalds 14811da177e4SLinus Torvalds out: 14821da177e4SLinus Torvalds fh_unlock(fhp); 14831da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 14841da177e4SLinus Torvalds dput(dchild); 14854a55c101SJan Kara fh_drop_write(fhp); 14861da177e4SLinus Torvalds return err; 14871da177e4SLinus Torvalds 14881da177e4SLinus Torvalds out_nfserr: 14896264d69dSAl Viro err = nfserrno(host_err); 14901da177e4SLinus Torvalds goto out; 14911da177e4SLinus Torvalds } 14921da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 14931da177e4SLinus Torvalds 14941da177e4SLinus Torvalds /* 14951da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 14961da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 14971da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 14981da177e4SLinus Torvalds */ 14996264d69dSAl Viro __be32 15001da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 15011da177e4SLinus Torvalds { 15026264d69dSAl Viro __be32 err; 15034d7edbc3SAl Viro const char *link; 150468ac1234SAl Viro struct path path; 15054d7edbc3SAl Viro DEFINE_DELAYED_CALL(done); 15064d7edbc3SAl Viro int len; 15071da177e4SLinus Torvalds 15088837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); 15094d7edbc3SAl Viro if (unlikely(err)) 15104d7edbc3SAl Viro return err; 15111da177e4SLinus Torvalds 151268ac1234SAl Viro path.mnt = fhp->fh_export->ex_path.mnt; 151368ac1234SAl Viro path.dentry = fhp->fh_dentry; 15141da177e4SLinus Torvalds 15154d7edbc3SAl Viro if (unlikely(!d_is_symlink(path.dentry))) 15164d7edbc3SAl Viro return nfserr_inval; 15171da177e4SLinus Torvalds 151868ac1234SAl Viro touch_atime(&path); 15191da177e4SLinus Torvalds 15204d7edbc3SAl Viro link = vfs_get_link(path.dentry, &done); 15214d7edbc3SAl Viro if (IS_ERR(link)) 15224d7edbc3SAl Viro return nfserrno(PTR_ERR(link)); 15231da177e4SLinus Torvalds 15244d7edbc3SAl Viro len = strlen(link); 15254d7edbc3SAl Viro if (len < *lenp) 15264d7edbc3SAl Viro *lenp = len; 15274d7edbc3SAl Viro memcpy(buf, link, *lenp); 15284d7edbc3SAl Viro do_delayed_call(&done); 15294d7edbc3SAl Viro return 0; 15301da177e4SLinus Torvalds } 15311da177e4SLinus Torvalds 15321da177e4SLinus Torvalds /* 15331da177e4SLinus Torvalds * Create a symlink and look up its inode 15341da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 15351da177e4SLinus Torvalds */ 15366264d69dSAl Viro __be32 15371da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 15381da177e4SLinus Torvalds char *fname, int flen, 153952ee0433SJ. Bruce Fields char *path, 15401e444f5bSKinglong Mee struct svc_fh *resfhp) 15411da177e4SLinus Torvalds { 15421da177e4SLinus Torvalds struct dentry *dentry, *dnew; 15436264d69dSAl Viro __be32 err, cerr; 15446264d69dSAl Viro int host_err; 15451da177e4SLinus Torvalds 15461da177e4SLinus Torvalds err = nfserr_noent; 154752ee0433SJ. Bruce Fields if (!flen || path[0] == '\0') 15481da177e4SLinus Torvalds goto out; 15491da177e4SLinus Torvalds err = nfserr_exist; 15501da177e4SLinus Torvalds if (isdotent(fname, flen)) 15511da177e4SLinus Torvalds goto out; 15521da177e4SLinus Torvalds 15538837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 15541da177e4SLinus Torvalds if (err) 15551da177e4SLinus Torvalds goto out; 15564a55c101SJan Kara 15574a55c101SJan Kara host_err = fh_want_write(fhp); 15584a55c101SJan Kara if (host_err) 15594a55c101SJan Kara goto out_nfserr; 15604a55c101SJan Kara 15611da177e4SLinus Torvalds fh_lock(fhp); 15621da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15631da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 15646264d69dSAl Viro host_err = PTR_ERR(dnew); 15651da177e4SLinus Torvalds if (IS_ERR(dnew)) 15661da177e4SLinus Torvalds goto out_nfserr; 15671da177e4SLinus Torvalds 15682b0143b5SDavid Howells host_err = vfs_symlink(d_inode(dentry), dnew, path); 15696264d69dSAl Viro err = nfserrno(host_err); 1570f501912aSBen Myers if (!err) 1571f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 15721da177e4SLinus Torvalds fh_unlock(fhp); 15731da177e4SLinus Torvalds 1574bad0dcffSAl Viro fh_drop_write(fhp); 157575c3f29dSDave Hansen 15761da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 15771da177e4SLinus Torvalds dput(dnew); 15781da177e4SLinus Torvalds if (err==0) err = cerr; 15791da177e4SLinus Torvalds out: 15801da177e4SLinus Torvalds return err; 15811da177e4SLinus Torvalds 15821da177e4SLinus Torvalds out_nfserr: 15836264d69dSAl Viro err = nfserrno(host_err); 15841da177e4SLinus Torvalds goto out; 15851da177e4SLinus Torvalds } 15861da177e4SLinus Torvalds 15871da177e4SLinus Torvalds /* 15881da177e4SLinus Torvalds * Create a hardlink 15891da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 15901da177e4SLinus Torvalds */ 15916264d69dSAl Viro __be32 15921da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 15931da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 15941da177e4SLinus Torvalds { 15951da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 159655b13354SJ. Bruce Fields struct inode *dirp; 15976264d69dSAl Viro __be32 err; 15986264d69dSAl Viro int host_err; 15991da177e4SLinus Torvalds 16008837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); 16011da177e4SLinus Torvalds if (err) 16021da177e4SLinus Torvalds goto out; 16037d818a7bSJ. Bruce Fields err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); 16041da177e4SLinus Torvalds if (err) 16051da177e4SLinus Torvalds goto out; 16067d818a7bSJ. Bruce Fields err = nfserr_isdir; 1607e36cb0b8SDavid Howells if (d_is_dir(tfhp->fh_dentry)) 16087d818a7bSJ. Bruce Fields goto out; 16091da177e4SLinus Torvalds err = nfserr_perm; 16101da177e4SLinus Torvalds if (!len) 16111da177e4SLinus Torvalds goto out; 16121da177e4SLinus Torvalds err = nfserr_exist; 16131da177e4SLinus Torvalds if (isdotent(name, len)) 16141da177e4SLinus Torvalds goto out; 16151da177e4SLinus Torvalds 16164a55c101SJan Kara host_err = fh_want_write(tfhp); 16174a55c101SJan Kara if (host_err) { 16184a55c101SJan Kara err = nfserrno(host_err); 16194a55c101SJan Kara goto out; 16204a55c101SJan Kara } 16214a55c101SJan Kara 162212fd3520SPeter Zijlstra fh_lock_nested(ffhp, I_MUTEX_PARENT); 16231da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 16242b0143b5SDavid Howells dirp = d_inode(ddir); 16251da177e4SLinus Torvalds 16261da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 16276264d69dSAl Viro host_err = PTR_ERR(dnew); 16281da177e4SLinus Torvalds if (IS_ERR(dnew)) 16291da177e4SLinus Torvalds goto out_nfserr; 16301da177e4SLinus Torvalds 16311da177e4SLinus Torvalds dold = tfhp->fh_dentry; 16321da177e4SLinus Torvalds 16334795bb37SJ. Bruce Fields err = nfserr_noent; 16342b0143b5SDavid Howells if (d_really_is_negative(dold)) 16354a55c101SJan Kara goto out_dput; 1636146a8595SJ. Bruce Fields host_err = vfs_link(dold, dirp, dnew, NULL); 16376264d69dSAl Viro if (!host_err) { 1638f501912aSBen Myers err = nfserrno(commit_metadata(ffhp)); 1639f501912aSBen Myers if (!err) 1640f501912aSBen Myers err = nfserrno(commit_metadata(tfhp)); 16411da177e4SLinus Torvalds } else { 16426264d69dSAl Viro if (host_err == -EXDEV && rqstp->rq_vers == 2) 16431da177e4SLinus Torvalds err = nfserr_acces; 16441da177e4SLinus Torvalds else 16456264d69dSAl Viro err = nfserrno(host_err); 16461da177e4SLinus Torvalds } 164775c3f29dSDave Hansen out_dput: 16481da177e4SLinus Torvalds dput(dnew); 1649270d56e5SDavid M. Richter out_unlock: 1650270d56e5SDavid M. Richter fh_unlock(ffhp); 16514a55c101SJan Kara fh_drop_write(tfhp); 16521da177e4SLinus Torvalds out: 16531da177e4SLinus Torvalds return err; 16541da177e4SLinus Torvalds 16551da177e4SLinus Torvalds out_nfserr: 16566264d69dSAl Viro err = nfserrno(host_err); 1657270d56e5SDavid M. Richter goto out_unlock; 16581da177e4SLinus Torvalds } 16591da177e4SLinus Torvalds 16601da177e4SLinus Torvalds /* 16611da177e4SLinus Torvalds * Rename a file 16621da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16631da177e4SLinus Torvalds */ 16646264d69dSAl Viro __be32 16651da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 16661da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 16671da177e4SLinus Torvalds { 16681da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 16691da177e4SLinus Torvalds struct inode *fdir, *tdir; 16706264d69dSAl Viro __be32 err; 16716264d69dSAl Viro int host_err; 16721da177e4SLinus Torvalds 16738837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); 16741da177e4SLinus Torvalds if (err) 16751da177e4SLinus Torvalds goto out; 16768837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); 16771da177e4SLinus Torvalds if (err) 16781da177e4SLinus Torvalds goto out; 16791da177e4SLinus Torvalds 16801da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 16812b0143b5SDavid Howells fdir = d_inode(fdentry); 16821da177e4SLinus Torvalds 16831da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 16842b0143b5SDavid Howells tdir = d_inode(tdentry); 16851da177e4SLinus Torvalds 16861da177e4SLinus Torvalds err = nfserr_perm; 16871da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 16881da177e4SLinus Torvalds goto out; 16891da177e4SLinus Torvalds 16904a55c101SJan Kara host_err = fh_want_write(ffhp); 16914a55c101SJan Kara if (host_err) { 16924a55c101SJan Kara err = nfserrno(host_err); 16934a55c101SJan Kara goto out; 16944a55c101SJan Kara } 16954a55c101SJan Kara 16961da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 16971da177e4SLinus Torvalds * so do it by hand */ 16981da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 1699aaf91ec1SJeff Layton ffhp->fh_locked = tfhp->fh_locked = true; 17001da177e4SLinus Torvalds fill_pre_wcc(ffhp); 17011da177e4SLinus Torvalds fill_pre_wcc(tfhp); 17021da177e4SLinus Torvalds 17031da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 17046264d69dSAl Viro host_err = PTR_ERR(odentry); 17051da177e4SLinus Torvalds if (IS_ERR(odentry)) 17061da177e4SLinus Torvalds goto out_nfserr; 17071da177e4SLinus Torvalds 17086264d69dSAl Viro host_err = -ENOENT; 17092b0143b5SDavid Howells if (d_really_is_negative(odentry)) 17101da177e4SLinus Torvalds goto out_dput_old; 17116264d69dSAl Viro host_err = -EINVAL; 17121da177e4SLinus Torvalds if (odentry == trap) 17131da177e4SLinus Torvalds goto out_dput_old; 17141da177e4SLinus Torvalds 17151da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 17166264d69dSAl Viro host_err = PTR_ERR(ndentry); 17171da177e4SLinus Torvalds if (IS_ERR(ndentry)) 17181da177e4SLinus Torvalds goto out_dput_old; 17196264d69dSAl Viro host_err = -ENOTEMPTY; 17201da177e4SLinus Torvalds if (ndentry == trap) 17211da177e4SLinus Torvalds goto out_dput_new; 17221da177e4SLinus Torvalds 17239079b1ebSDave Hansen host_err = -EXDEV; 17249079b1ebSDave Hansen if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) 17259079b1ebSDave Hansen goto out_dput_new; 1726aa387d6cSJ. Bruce Fields if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry) 1727aa387d6cSJ. Bruce Fields goto out_dput_new; 17289079b1ebSDave Hansen 1729520c8b16SMiklos Szeredi host_err = vfs_rename(fdir, odentry, tdir, ndentry, NULL, 0); 1730f501912aSBen Myers if (!host_err) { 1731f501912aSBen Myers host_err = commit_metadata(tfhp); 17326264d69dSAl Viro if (!host_err) 1733f501912aSBen Myers host_err = commit_metadata(ffhp); 17341da177e4SLinus Torvalds } 17351da177e4SLinus Torvalds out_dput_new: 17361da177e4SLinus Torvalds dput(ndentry); 17371da177e4SLinus Torvalds out_dput_old: 17381da177e4SLinus Torvalds dput(odentry); 17391da177e4SLinus Torvalds out_nfserr: 17406264d69dSAl Viro err = nfserrno(host_err); 1741fbb74a34SJ. Bruce Fields /* 1742fbb74a34SJ. Bruce Fields * We cannot rely on fh_unlock on the two filehandles, 17431da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 1744fbb74a34SJ. Bruce Fields * were the same, so again we do it by hand. 17451da177e4SLinus Torvalds */ 17461da177e4SLinus Torvalds fill_post_wcc(ffhp); 17471da177e4SLinus Torvalds fill_post_wcc(tfhp); 17481da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 1749aaf91ec1SJeff Layton ffhp->fh_locked = tfhp->fh_locked = false; 17504a55c101SJan Kara fh_drop_write(ffhp); 17511da177e4SLinus Torvalds 17521da177e4SLinus Torvalds out: 17531da177e4SLinus Torvalds return err; 17541da177e4SLinus Torvalds } 17551da177e4SLinus Torvalds 17561da177e4SLinus Torvalds /* 17571da177e4SLinus Torvalds * Unlink a file or directory 17581da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 17591da177e4SLinus Torvalds */ 17606264d69dSAl Viro __be32 17611da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 17621da177e4SLinus Torvalds char *fname, int flen) 17631da177e4SLinus Torvalds { 17641da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 17651da177e4SLinus Torvalds struct inode *dirp; 17666264d69dSAl Viro __be32 err; 17676264d69dSAl Viro int host_err; 17681da177e4SLinus Torvalds 17691da177e4SLinus Torvalds err = nfserr_acces; 17701da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 17711da177e4SLinus Torvalds goto out; 17728837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); 17731da177e4SLinus Torvalds if (err) 17741da177e4SLinus Torvalds goto out; 17751da177e4SLinus Torvalds 17764a55c101SJan Kara host_err = fh_want_write(fhp); 17774a55c101SJan Kara if (host_err) 17784a55c101SJan Kara goto out_nfserr; 17794a55c101SJan Kara 178012fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 17811da177e4SLinus Torvalds dentry = fhp->fh_dentry; 17822b0143b5SDavid Howells dirp = d_inode(dentry); 17831da177e4SLinus Torvalds 17841da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 17856264d69dSAl Viro host_err = PTR_ERR(rdentry); 17861da177e4SLinus Torvalds if (IS_ERR(rdentry)) 17871da177e4SLinus Torvalds goto out_nfserr; 17881da177e4SLinus Torvalds 17892b0143b5SDavid Howells if (d_really_is_negative(rdentry)) { 17901da177e4SLinus Torvalds dput(rdentry); 17911da177e4SLinus Torvalds err = nfserr_noent; 17921da177e4SLinus Torvalds goto out; 17931da177e4SLinus Torvalds } 17941da177e4SLinus Torvalds 17951da177e4SLinus Torvalds if (!type) 17962b0143b5SDavid Howells type = d_inode(rdentry)->i_mode & S_IFMT; 17971da177e4SLinus Torvalds 17989ce137eeSJ. Bruce Fields if (type != S_IFDIR) 1799b21996e3SJ. Bruce Fields host_err = vfs_unlink(dirp, rdentry, NULL); 18009ce137eeSJ. Bruce Fields else 18016264d69dSAl Viro host_err = vfs_rmdir(dirp, rdentry); 1802541ce98cSJ. Bruce Fields if (!host_err) 1803541ce98cSJ. Bruce Fields host_err = commit_metadata(fhp); 18041da177e4SLinus Torvalds dput(rdentry); 18051da177e4SLinus Torvalds 18061da177e4SLinus Torvalds out_nfserr: 18076264d69dSAl Viro err = nfserrno(host_err); 1808f193fbabSYAMAMOTO Takashi out: 1809f193fbabSYAMAMOTO Takashi return err; 18101da177e4SLinus Torvalds } 18111da177e4SLinus Torvalds 18121da177e4SLinus Torvalds /* 181314f7dd63SDavid Woodhouse * We do this buffering because we must not call back into the file 181414f7dd63SDavid Woodhouse * system's ->lookup() method from the filldir callback. That may well 181514f7dd63SDavid Woodhouse * deadlock a number of file systems. 181614f7dd63SDavid Woodhouse * 181714f7dd63SDavid Woodhouse * This is based heavily on the implementation of same in XFS. 181814f7dd63SDavid Woodhouse */ 181914f7dd63SDavid Woodhouse struct buffered_dirent { 182014f7dd63SDavid Woodhouse u64 ino; 182114f7dd63SDavid Woodhouse loff_t offset; 182214f7dd63SDavid Woodhouse int namlen; 182314f7dd63SDavid Woodhouse unsigned int d_type; 182414f7dd63SDavid Woodhouse char name[]; 182514f7dd63SDavid Woodhouse }; 182614f7dd63SDavid Woodhouse 182714f7dd63SDavid Woodhouse struct readdir_data { 18285c0ba4e0SAl Viro struct dir_context ctx; 182914f7dd63SDavid Woodhouse char *dirent; 183014f7dd63SDavid Woodhouse size_t used; 183153c9c5c0SAl Viro int full; 183214f7dd63SDavid Woodhouse }; 183314f7dd63SDavid Woodhouse 1834ac7576f4SMiklos Szeredi static int nfsd_buffered_filldir(struct dir_context *ctx, const char *name, 1835ac7576f4SMiklos Szeredi int namlen, loff_t offset, u64 ino, 1836ac7576f4SMiklos Szeredi unsigned int d_type) 183714f7dd63SDavid Woodhouse { 1838ac7576f4SMiklos Szeredi struct readdir_data *buf = 1839ac7576f4SMiklos Szeredi container_of(ctx, struct readdir_data, ctx); 184014f7dd63SDavid Woodhouse struct buffered_dirent *de = (void *)(buf->dirent + buf->used); 184114f7dd63SDavid Woodhouse unsigned int reclen; 184214f7dd63SDavid Woodhouse 184314f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); 184453c9c5c0SAl Viro if (buf->used + reclen > PAGE_SIZE) { 184553c9c5c0SAl Viro buf->full = 1; 184614f7dd63SDavid Woodhouse return -EINVAL; 184753c9c5c0SAl Viro } 184814f7dd63SDavid Woodhouse 184914f7dd63SDavid Woodhouse de->namlen = namlen; 185014f7dd63SDavid Woodhouse de->offset = offset; 185114f7dd63SDavid Woodhouse de->ino = ino; 185214f7dd63SDavid Woodhouse de->d_type = d_type; 185314f7dd63SDavid Woodhouse memcpy(de->name, name, namlen); 185414f7dd63SDavid Woodhouse buf->used += reclen; 185514f7dd63SDavid Woodhouse 185614f7dd63SDavid Woodhouse return 0; 185714f7dd63SDavid Woodhouse } 185814f7dd63SDavid Woodhouse 1859ac7576f4SMiklos Szeredi static __be32 nfsd_buffered_readdir(struct file *file, nfsd_filldir_t func, 18602628b766SDavid Woodhouse struct readdir_cd *cdp, loff_t *offsetp) 18612628b766SDavid Woodhouse { 186214f7dd63SDavid Woodhouse struct buffered_dirent *de; 18632628b766SDavid Woodhouse int host_err; 186414f7dd63SDavid Woodhouse int size; 186514f7dd63SDavid Woodhouse loff_t offset; 1866ac6614b7SAl Viro struct readdir_data buf = { 1867ac6614b7SAl Viro .ctx.actor = nfsd_buffered_filldir, 1868ac6614b7SAl Viro .dirent = (void *)__get_free_page(GFP_KERNEL) 1869ac6614b7SAl Viro }; 18702628b766SDavid Woodhouse 187114f7dd63SDavid Woodhouse if (!buf.dirent) 18722f9092e1SDavid Woodhouse return nfserrno(-ENOMEM); 187314f7dd63SDavid Woodhouse 187414f7dd63SDavid Woodhouse offset = *offsetp; 18752628b766SDavid Woodhouse 187614f7dd63SDavid Woodhouse while (1) { 187714f7dd63SDavid Woodhouse unsigned int reclen; 187814f7dd63SDavid Woodhouse 1879b726e923SDoug Nazar cdp->err = nfserr_eof; /* will be cleared on successful read */ 188014f7dd63SDavid Woodhouse buf.used = 0; 188153c9c5c0SAl Viro buf.full = 0; 188214f7dd63SDavid Woodhouse 18835c0ba4e0SAl Viro host_err = iterate_dir(file, &buf.ctx); 188453c9c5c0SAl Viro if (buf.full) 188553c9c5c0SAl Viro host_err = 0; 188653c9c5c0SAl Viro 188753c9c5c0SAl Viro if (host_err < 0) 188814f7dd63SDavid Woodhouse break; 188914f7dd63SDavid Woodhouse 189014f7dd63SDavid Woodhouse size = buf.used; 189114f7dd63SDavid Woodhouse 189214f7dd63SDavid Woodhouse if (!size) 189314f7dd63SDavid Woodhouse break; 189414f7dd63SDavid Woodhouse 189514f7dd63SDavid Woodhouse de = (struct buffered_dirent *)buf.dirent; 189614f7dd63SDavid Woodhouse while (size > 0) { 189714f7dd63SDavid Woodhouse offset = de->offset; 189814f7dd63SDavid Woodhouse 189914f7dd63SDavid Woodhouse if (func(cdp, de->name, de->namlen, de->offset, 190014f7dd63SDavid Woodhouse de->ino, de->d_type)) 19012f9092e1SDavid Woodhouse break; 190214f7dd63SDavid Woodhouse 190314f7dd63SDavid Woodhouse if (cdp->err != nfs_ok) 19042f9092e1SDavid Woodhouse break; 190514f7dd63SDavid Woodhouse 190614f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(*de) + de->namlen, 190714f7dd63SDavid Woodhouse sizeof(u64)); 190814f7dd63SDavid Woodhouse size -= reclen; 190914f7dd63SDavid Woodhouse de = (struct buffered_dirent *)((char *)de + reclen); 191014f7dd63SDavid Woodhouse } 19112f9092e1SDavid Woodhouse if (size > 0) /* We bailed out early */ 19122f9092e1SDavid Woodhouse break; 19132f9092e1SDavid Woodhouse 1914c002a6c7SDavid Woodhouse offset = vfs_llseek(file, 0, SEEK_CUR); 191514f7dd63SDavid Woodhouse } 191614f7dd63SDavid Woodhouse 191714f7dd63SDavid Woodhouse free_page((unsigned long)(buf.dirent)); 19182628b766SDavid Woodhouse 19192628b766SDavid Woodhouse if (host_err) 19202628b766SDavid Woodhouse return nfserrno(host_err); 192114f7dd63SDavid Woodhouse 192214f7dd63SDavid Woodhouse *offsetp = offset; 19232628b766SDavid Woodhouse return cdp->err; 19242628b766SDavid Woodhouse } 19252628b766SDavid Woodhouse 19261da177e4SLinus Torvalds /* 19271da177e4SLinus Torvalds * Read entries from a directory. 19281da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 19291da177e4SLinus Torvalds */ 19306264d69dSAl Viro __be32 19311da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 1932ac7576f4SMiklos Szeredi struct readdir_cd *cdp, nfsd_filldir_t func) 19331da177e4SLinus Torvalds { 19346264d69dSAl Viro __be32 err; 19351da177e4SLinus Torvalds struct file *file; 19361da177e4SLinus Torvalds loff_t offset = *offsetp; 193706effdbbSBernd Schubert int may_flags = NFSD_MAY_READ; 19381da177e4SLinus Torvalds 193906effdbbSBernd Schubert /* NFSv2 only supports 32 bit cookies */ 194006effdbbSBernd Schubert if (rqstp->rq_vers > 2) 194106effdbbSBernd Schubert may_flags |= NFSD_MAY_64BIT_COOKIE; 194206effdbbSBernd Schubert 194306effdbbSBernd Schubert err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file); 19441da177e4SLinus Torvalds if (err) 19451da177e4SLinus Torvalds goto out; 19461da177e4SLinus Torvalds 1947b108fe6bSJeff Layton offset = vfs_llseek(file, offset, SEEK_SET); 19481da177e4SLinus Torvalds if (offset < 0) { 19491da177e4SLinus Torvalds err = nfserrno((int)offset); 19501da177e4SLinus Torvalds goto out_close; 19511da177e4SLinus Torvalds } 19521da177e4SLinus Torvalds 195314f7dd63SDavid Woodhouse err = nfsd_buffered_readdir(file, func, cdp, offsetp); 19541da177e4SLinus Torvalds 19551da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 19561da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 19571da177e4SLinus Torvalds out_close: 1958fd891454SChristoph Hellwig fput(file); 19591da177e4SLinus Torvalds out: 19601da177e4SLinus Torvalds return err; 19611da177e4SLinus Torvalds } 19621da177e4SLinus Torvalds 19631da177e4SLinus Torvalds /* 19641da177e4SLinus Torvalds * Get file system stats 19651da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 19661da177e4SLinus Torvalds */ 19676264d69dSAl Viro __be32 196804716e66SJ. Bruce Fields nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) 19691da177e4SLinus Torvalds { 1970f6360efbSTakashi Iwai __be32 err; 1971f6360efbSTakashi Iwai 1972f6360efbSTakashi Iwai err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); 1973f6360efbSTakashi Iwai if (!err) { 1974ebabe9a9SChristoph Hellwig struct path path = { 1975ebabe9a9SChristoph Hellwig .mnt = fhp->fh_export->ex_path.mnt, 1976ebabe9a9SChristoph Hellwig .dentry = fhp->fh_dentry, 1977ebabe9a9SChristoph Hellwig }; 1978f6360efbSTakashi Iwai if (vfs_statfs(&path, stat)) 19791da177e4SLinus Torvalds err = nfserr_io; 1980f6360efbSTakashi Iwai } 19811da177e4SLinus Torvalds return err; 19821da177e4SLinus Torvalds } 19831da177e4SLinus Torvalds 1984c7d51402SJ. Bruce Fields static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) 1985e22841c6SJ. Bruce Fields { 1986c7d51402SJ. Bruce Fields return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; 1987e22841c6SJ. Bruce Fields } 1988e22841c6SJ. Bruce Fields 19891da177e4SLinus Torvalds /* 19901da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 19911da177e4SLinus Torvalds */ 19926264d69dSAl Viro __be32 19930ec757dfSJ. Bruce Fields nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, 19940ec757dfSJ. Bruce Fields struct dentry *dentry, int acc) 19951da177e4SLinus Torvalds { 19962b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 19971da177e4SLinus Torvalds int err; 19981da177e4SLinus Torvalds 1999aea93397SJ. Bruce Fields if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) 20001da177e4SLinus Torvalds return 0; 20011da177e4SLinus Torvalds #if 0 20021da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 20031da177e4SLinus Torvalds acc, 20048837abcaSMiklos Szeredi (acc & NFSD_MAY_READ)? " read" : "", 20058837abcaSMiklos Szeredi (acc & NFSD_MAY_WRITE)? " write" : "", 20068837abcaSMiklos Szeredi (acc & NFSD_MAY_EXEC)? " exec" : "", 20078837abcaSMiklos Szeredi (acc & NFSD_MAY_SATTR)? " sattr" : "", 20088837abcaSMiklos Szeredi (acc & NFSD_MAY_TRUNC)? " trunc" : "", 20098837abcaSMiklos Szeredi (acc & NFSD_MAY_LOCK)? " lock" : "", 20108837abcaSMiklos Szeredi (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", 20111da177e4SLinus Torvalds inode->i_mode, 20121da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 20131da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 20142c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); 20151da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 20165cc0a840SDavid Howells inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); 20171da177e4SLinus Torvalds #endif 20181da177e4SLinus Torvalds 20191da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 20201da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 20211da177e4SLinus Torvalds * device special file, we ignore rofs. 20221da177e4SLinus Torvalds */ 20238837abcaSMiklos Szeredi if (!(acc & NFSD_MAY_LOCAL_ACCESS)) 20248837abcaSMiklos Szeredi if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { 20252c463e95SDave Hansen if (exp_rdonly(rqstp, exp) || 20262c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)) 20271da177e4SLinus Torvalds return nfserr_rofs; 20288837abcaSMiklos Szeredi if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) 20291da177e4SLinus Torvalds return nfserr_perm; 20301da177e4SLinus Torvalds } 20318837abcaSMiklos Szeredi if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) 20321da177e4SLinus Torvalds return nfserr_perm; 20331da177e4SLinus Torvalds 20348837abcaSMiklos Szeredi if (acc & NFSD_MAY_LOCK) { 20351da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 20361da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 20371da177e4SLinus Torvalds * ownership 20381da177e4SLinus Torvalds */ 20391da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 20401da177e4SLinus Torvalds return 0; 20411da177e4SLinus Torvalds else 20428837abcaSMiklos Szeredi acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; 20431da177e4SLinus Torvalds } 20441da177e4SLinus Torvalds /* 20451da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 20461da177e4SLinus Torvalds * would normally be checked at open time. This is to make 20471da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 20481da177e4SLinus Torvalds * 20491da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 20501da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 20511da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 20521da177e4SLinus Torvalds * always implies file truncation. 20531da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 20541da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 20551da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 20561da177e4SLinus Torvalds * with NFSv3. 20571da177e4SLinus Torvalds */ 20588837abcaSMiklos Szeredi if ((acc & NFSD_MAY_OWNER_OVERRIDE) && 20596fab8779SEric W. Biederman uid_eq(inode->i_uid, current_fsuid())) 20601da177e4SLinus Torvalds return 0; 20611da177e4SLinus Torvalds 20628837abcaSMiklos Szeredi /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ 2063f419a2e3SAl Viro err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); 20641da177e4SLinus Torvalds 20651da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 20661da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 2067a043226bSJ. Bruce Fields (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || 2068a043226bSJ. Bruce Fields acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) 2069f419a2e3SAl Viro err = inode_permission(inode, MAY_EXEC); 20701da177e4SLinus Torvalds 20711da177e4SLinus Torvalds return err? nfserrno(err) : 0; 20721da177e4SLinus Torvalds } 20731da177e4SLinus Torvalds 20741da177e4SLinus Torvalds void 20751da177e4SLinus Torvalds nfsd_racache_shutdown(void) 20761da177e4SLinus Torvalds { 207754a66e54SJeff Layton struct raparms *raparm, *last_raparm; 207854a66e54SJeff Layton unsigned int i; 207954a66e54SJeff Layton 20801da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 208154a66e54SJeff Layton 208254a66e54SJeff Layton for (i = 0; i < RAPARM_HASH_SIZE; i++) { 208354a66e54SJeff Layton raparm = raparm_hash[i].pb_head; 208454a66e54SJeff Layton while(raparm) { 208554a66e54SJeff Layton last_raparm = raparm; 208654a66e54SJeff Layton raparm = raparm->p_next; 208754a66e54SJeff Layton kfree(last_raparm); 208854a66e54SJeff Layton } 208954a66e54SJeff Layton raparm_hash[i].pb_head = NULL; 209054a66e54SJeff Layton } 20911da177e4SLinus Torvalds } 20921da177e4SLinus Torvalds /* 20931da177e4SLinus Torvalds * Initialize readahead param cache 20941da177e4SLinus Torvalds */ 20951da177e4SLinus Torvalds int 20961da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 20971da177e4SLinus Torvalds { 20981da177e4SLinus Torvalds int i; 2099fce1456aSGreg Banks int j = 0; 2100fce1456aSGreg Banks int nperbucket; 210154a66e54SJeff Layton struct raparms **raparm = NULL; 21021da177e4SLinus Torvalds 2103fce1456aSGreg Banks 210454a66e54SJeff Layton if (raparm_hash[0].pb_head) 21051da177e4SLinus Torvalds return 0; 210654a66e54SJeff Layton nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); 21073c7aa15dSKinglong Mee nperbucket = max(2, nperbucket); 210854a66e54SJeff Layton cache_size = nperbucket * RAPARM_HASH_SIZE; 21094b3bb06bSYan Burman 21104b3bb06bSYan Burman dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); 211154a66e54SJeff Layton 2112fce1456aSGreg Banks for (i = 0; i < RAPARM_HASH_SIZE; i++) { 2113fce1456aSGreg Banks spin_lock_init(&raparm_hash[i].pb_lock); 211454a66e54SJeff Layton 211554a66e54SJeff Layton raparm = &raparm_hash[i].pb_head; 211654a66e54SJeff Layton for (j = 0; j < nperbucket; j++) { 211754a66e54SJeff Layton *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); 211854a66e54SJeff Layton if (!*raparm) 211954a66e54SJeff Layton goto out_nomem; 212054a66e54SJeff Layton raparm = &(*raparm)->p_next; 2121fce1456aSGreg Banks } 212254a66e54SJeff Layton *raparm = NULL; 21231da177e4SLinus Torvalds } 21244b3bb06bSYan Burman 21251da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 21261da177e4SLinus Torvalds return 0; 212754a66e54SJeff Layton 212854a66e54SJeff Layton out_nomem: 212954a66e54SJeff Layton dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); 213054a66e54SJeff Layton nfsd_racache_shutdown(); 213154a66e54SJeff Layton return -ENOMEM; 21321da177e4SLinus Torvalds } 2133