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> 29cbcc268bSMatthew Wilcox (Oracle) #include <linux/pagemap.h> 305a0e3ad6STejun Heo #include <linux/slab.h> 317c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 32f501912aSBen Myers #include <linux/exportfs.h> 33f501912aSBen Myers #include <linux/writeback.h> 3418032ca0SDavid Quigley #include <linux/security.h> 359a74af21SBoaz Harrosh 369a74af21SBoaz Harrosh #include "xdr3.h" 379a74af21SBoaz Harrosh 385be196e5SChristoph Hellwig #ifdef CONFIG_NFSD_V4 39ffa0160aSChristoph Hellwig #include "../internal.h" 402ca72e17SJ. Bruce Fields #include "acl.h" 412ca72e17SJ. Bruce Fields #include "idmap.h" 42a2f4c3faSTrond Myklebust #include "xdr4.h" 431da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V4 */ 441da177e4SLinus Torvalds 459a74af21SBoaz Harrosh #include "nfsd.h" 469a74af21SBoaz Harrosh #include "vfs.h" 47b4935239SJeff Layton #include "filecache.h" 486e8b50d1SJeff Layton #include "trace.h" 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds #define NFSDDBG_FACILITY NFSDDBG_FILEOP 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds /* 531da177e4SLinus Torvalds * Called from nfsd_lookup and encode_dirent. Check if we have crossed 541da177e4SLinus Torvalds * a mount point. 55e0bb89efSJ.Bruce Fields * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, 561da177e4SLinus Torvalds * or nfs_ok having possibly changed *dpp and *expp 571da177e4SLinus Torvalds */ 581da177e4SLinus Torvalds int 591da177e4SLinus Torvalds nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 601da177e4SLinus Torvalds struct svc_export **expp) 611da177e4SLinus Torvalds { 621da177e4SLinus Torvalds struct svc_export *exp = *expp, *exp2 = NULL; 631da177e4SLinus Torvalds struct dentry *dentry = *dpp; 6491c9fa8fSAl Viro struct path path = {.mnt = mntget(exp->ex_path.mnt), 6591c9fa8fSAl Viro .dentry = dget(dentry)}; 666264d69dSAl Viro int err = 0; 671da177e4SLinus Torvalds 687cc90cc3SAl Viro err = follow_down(&path); 69cc53ce53SDavid Howells if (err < 0) 70cc53ce53SDavid Howells goto out; 7199bbf6ecSNeilBrown if (path.mnt == exp->ex_path.mnt && path.dentry == dentry && 7299bbf6ecSNeilBrown nfsd_mountpoint(dentry, exp) == 2) { 7399bbf6ecSNeilBrown /* This is only a mountpoint in some other namespace */ 7499bbf6ecSNeilBrown path_put(&path); 7599bbf6ecSNeilBrown goto out; 7699bbf6ecSNeilBrown } 771da177e4SLinus Torvalds 7891c9fa8fSAl Viro exp2 = rqst_exp_get_by_name(rqstp, &path); 791da177e4SLinus Torvalds if (IS_ERR(exp2)) { 801da177e4SLinus Torvalds err = PTR_ERR(exp2); 813b6cee7bSJ. Bruce Fields /* 823b6cee7bSJ. Bruce Fields * We normally allow NFS clients to continue 833b6cee7bSJ. Bruce Fields * "underneath" a mountpoint that is not exported. 843b6cee7bSJ. Bruce Fields * The exception is V4ROOT, where no traversal is ever 853b6cee7bSJ. Bruce Fields * allowed without an explicit export of the new 863b6cee7bSJ. Bruce Fields * directory. 873b6cee7bSJ. Bruce Fields */ 883b6cee7bSJ. Bruce Fields if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) 893b6cee7bSJ. Bruce Fields err = 0; 9091c9fa8fSAl Viro path_put(&path); 911da177e4SLinus Torvalds goto out; 921da177e4SLinus Torvalds } 933c394ddaSSteve Dickson if (nfsd_v4client(rqstp) || 943c394ddaSSteve Dickson (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { 951da177e4SLinus Torvalds /* successfully crossed mount point */ 961644ccc8SAl Viro /* 9791c9fa8fSAl Viro * This is subtle: path.dentry is *not* on path.mnt 9891c9fa8fSAl Viro * at this point. The only reason we are safe is that 9991c9fa8fSAl Viro * original mnt is pinned down by exp, so we should 10091c9fa8fSAl Viro * put path *before* putting exp 1011644ccc8SAl Viro */ 10291c9fa8fSAl Viro *dpp = path.dentry; 10391c9fa8fSAl Viro path.dentry = dentry; 1041644ccc8SAl Viro *expp = exp2; 10591c9fa8fSAl Viro exp2 = exp; 1061da177e4SLinus Torvalds } 10791c9fa8fSAl Viro path_put(&path); 10891c9fa8fSAl Viro exp_put(exp2); 1091da177e4SLinus Torvalds out: 1101da177e4SLinus Torvalds return err; 1111da177e4SLinus Torvalds } 1121da177e4SLinus Torvalds 113289ede45SJ. Bruce Fields static void follow_to_parent(struct path *path) 114289ede45SJ. Bruce Fields { 115289ede45SJ. Bruce Fields struct dentry *dp; 116289ede45SJ. Bruce Fields 117289ede45SJ. Bruce Fields while (path->dentry == path->mnt->mnt_root && follow_up(path)) 118289ede45SJ. Bruce Fields ; 119289ede45SJ. Bruce Fields dp = dget_parent(path->dentry); 120289ede45SJ. Bruce Fields dput(path->dentry); 121289ede45SJ. Bruce Fields path->dentry = dp; 122289ede45SJ. Bruce Fields } 123289ede45SJ. Bruce Fields 124289ede45SJ. Bruce Fields static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) 125289ede45SJ. Bruce Fields { 126289ede45SJ. Bruce Fields struct svc_export *exp2; 127289ede45SJ. Bruce Fields struct path path = {.mnt = mntget((*exp)->ex_path.mnt), 128289ede45SJ. Bruce Fields .dentry = dget(dparent)}; 129289ede45SJ. Bruce Fields 130289ede45SJ. Bruce Fields follow_to_parent(&path); 131289ede45SJ. Bruce Fields 132289ede45SJ. Bruce Fields exp2 = rqst_exp_parent(rqstp, &path); 133289ede45SJ. Bruce Fields if (PTR_ERR(exp2) == -ENOENT) { 134289ede45SJ. Bruce Fields *dentryp = dget(dparent); 135289ede45SJ. Bruce Fields } else if (IS_ERR(exp2)) { 136289ede45SJ. Bruce Fields path_put(&path); 137289ede45SJ. Bruce Fields return PTR_ERR(exp2); 138289ede45SJ. Bruce Fields } else { 139289ede45SJ. Bruce Fields *dentryp = dget(path.dentry); 140289ede45SJ. Bruce Fields exp_put(*exp); 141289ede45SJ. Bruce Fields *exp = exp2; 142289ede45SJ. Bruce Fields } 143289ede45SJ. Bruce Fields path_put(&path); 144289ede45SJ. Bruce Fields return 0; 145289ede45SJ. Bruce Fields } 146289ede45SJ. Bruce Fields 14782ead7feSJ. Bruce Fields /* 14882ead7feSJ. Bruce Fields * For nfsd purposes, we treat V4ROOT exports as though there was an 14982ead7feSJ. Bruce Fields * export at *every* directory. 15099bbf6ecSNeilBrown * We return: 15199bbf6ecSNeilBrown * '1' if this dentry *must* be an export point, 15299bbf6ecSNeilBrown * '2' if it might be, if there is really a mount here, and 15399bbf6ecSNeilBrown * '0' if there is no chance of an export point here. 15482ead7feSJ. Bruce Fields */ 1553227fa41SJ. Bruce Fields int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) 15682ead7feSJ. Bruce Fields { 15799bbf6ecSNeilBrown if (!d_inode(dentry)) 15899bbf6ecSNeilBrown return 0; 15999bbf6ecSNeilBrown if (exp->ex_flags & NFSEXP_V4ROOT) 16082ead7feSJ. Bruce Fields return 1; 16111fcee02STrond Myklebust if (nfsd4_is_junction(dentry)) 16211fcee02STrond Myklebust return 1; 16399bbf6ecSNeilBrown if (d_mountpoint(dentry)) 16499bbf6ecSNeilBrown /* 16599bbf6ecSNeilBrown * Might only be a mountpoint in a different namespace, 16699bbf6ecSNeilBrown * but we need to check. 16799bbf6ecSNeilBrown */ 16899bbf6ecSNeilBrown return 2; 16982ead7feSJ. Bruce Fields return 0; 17082ead7feSJ. Bruce Fields } 17182ead7feSJ. Bruce Fields 1726264d69dSAl Viro __be32 1736c0a654dSJ. Bruce Fields nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, 1745a022fc8SChuck Lever const char *name, unsigned int len, 1756c0a654dSJ. Bruce Fields struct svc_export **exp_ret, struct dentry **dentry_ret) 1761da177e4SLinus Torvalds { 1771da177e4SLinus Torvalds struct svc_export *exp; 1781da177e4SLinus Torvalds struct dentry *dparent; 1791da177e4SLinus Torvalds struct dentry *dentry; 1806264d69dSAl Viro int host_err; 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds dparent = fhp->fh_dentry; 185bf18f163SKinglong Mee exp = exp_get(fhp->fh_export); 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds /* Lookup the name, but don't follow links */ 1881da177e4SLinus Torvalds if (isdotent(name, len)) { 1891da177e4SLinus Torvalds if (len==1) 1901da177e4SLinus Torvalds dentry = dget(dparent); 19154775491SJan Blunck else if (dparent != exp->ex_path.dentry) 1921da177e4SLinus Torvalds dentry = dget_parent(dparent); 193fed83811SJ. Bruce Fields else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) 1941da177e4SLinus Torvalds dentry = dget(dparent); /* .. == . just like at / */ 1951da177e4SLinus Torvalds else { 1961da177e4SLinus Torvalds /* checking mountpoint crossing is very different when stepping up */ 197289ede45SJ. Bruce Fields host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); 198289ede45SJ. Bruce Fields if (host_err) 1991da177e4SLinus Torvalds goto out_nfserr; 2001da177e4SLinus Torvalds } 2011da177e4SLinus Torvalds } else { 20219d008b4SNeilBrown dentry = lookup_one_len_unlocked(name, dparent, len); 2036264d69dSAl Viro host_err = PTR_ERR(dentry); 2041da177e4SLinus Torvalds if (IS_ERR(dentry)) 2051da177e4SLinus Torvalds goto out_nfserr; 20682ead7feSJ. Bruce Fields if (nfsd_mountpoint(dentry, exp)) { 20719d008b4SNeilBrown host_err = nfsd_cross_mnt(rqstp, &dentry, &exp); 20819d008b4SNeilBrown if (host_err) { 2091da177e4SLinus Torvalds dput(dentry); 2101da177e4SLinus Torvalds goto out_nfserr; 2111da177e4SLinus Torvalds } 2121da177e4SLinus Torvalds } 2131da177e4SLinus Torvalds } 2146c0a654dSJ. Bruce Fields *dentry_ret = dentry; 2156c0a654dSJ. Bruce Fields *exp_ret = exp; 2166c0a654dSJ. Bruce Fields return 0; 2176c0a654dSJ. Bruce Fields 2186c0a654dSJ. Bruce Fields out_nfserr: 2196c0a654dSJ. Bruce Fields exp_put(exp); 2206c0a654dSJ. Bruce Fields return nfserrno(host_err); 2216c0a654dSJ. Bruce Fields } 2226c0a654dSJ. Bruce Fields 22319d008b4SNeilBrown /** 22419d008b4SNeilBrown * nfsd_lookup - look up a single path component for nfsd 22519d008b4SNeilBrown * 22619d008b4SNeilBrown * @rqstp: the request context 22719d008b4SNeilBrown * @fhp: the file handle of the directory 22819d008b4SNeilBrown * @name: the component name, or %NULL to look up parent 22919d008b4SNeilBrown * @len: length of name to examine 23019d008b4SNeilBrown * @resfh: pointer to pre-initialised filehandle to hold result. 23119d008b4SNeilBrown * 2326c0a654dSJ. Bruce Fields * Look up one component of a pathname. 2336c0a654dSJ. Bruce Fields * N.B. After this call _both_ fhp and resfh need an fh_put 2346c0a654dSJ. Bruce Fields * 2356c0a654dSJ. Bruce Fields * If the lookup would cross a mountpoint, and the mounted filesystem 2366c0a654dSJ. Bruce Fields * is exported to the client with NFSEXP_NOHIDE, then the lookup is 2376c0a654dSJ. Bruce Fields * accepted as it stands and the mounted directory is 2386c0a654dSJ. Bruce Fields * returned. Otherwise the covered directory is returned. 2396c0a654dSJ. Bruce Fields * NOTE: this mountpoint crossing is not supported properly by all 2406c0a654dSJ. Bruce Fields * clients and is explicitly disallowed for NFSv3 24119d008b4SNeilBrown * 2426c0a654dSJ. Bruce Fields */ 2436c0a654dSJ. Bruce Fields __be32 2446c0a654dSJ. Bruce Fields nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 2455a022fc8SChuck Lever unsigned int len, struct svc_fh *resfh) 2466c0a654dSJ. Bruce Fields { 2476c0a654dSJ. Bruce Fields struct svc_export *exp; 2486c0a654dSJ. Bruce Fields struct dentry *dentry; 2496c0a654dSJ. Bruce Fields __be32 err; 2506c0a654dSJ. Bruce Fields 25129a78a3eSJ. Bruce Fields err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 25229a78a3eSJ. Bruce Fields if (err) 25329a78a3eSJ. Bruce Fields return err; 2546c0a654dSJ. Bruce Fields err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); 2556c0a654dSJ. Bruce Fields if (err) 2566c0a654dSJ. Bruce Fields return err; 25732c1eb0cSAndy Adamson err = check_nfsd_access(exp, rqstp); 25832c1eb0cSAndy Adamson if (err) 25932c1eb0cSAndy Adamson goto out; 2601da177e4SLinus Torvalds /* 2611da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2621da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2631da177e4SLinus Torvalds */ 2641da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2652b0143b5SDavid Howells if (!err && d_really_is_negative(dentry)) 2661da177e4SLinus Torvalds err = nfserr_noent; 26732c1eb0cSAndy Adamson out: 2681da177e4SLinus Torvalds dput(dentry); 2691da177e4SLinus Torvalds exp_put(exp); 2701da177e4SLinus Torvalds return err; 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds 273f501912aSBen Myers /* 274f501912aSBen Myers * Commit metadata changes to stable storage. 275f501912aSBen Myers */ 276f501912aSBen Myers static int 27757f64034STrond Myklebust commit_inode_metadata(struct inode *inode) 278f501912aSBen Myers { 279f501912aSBen Myers const struct export_operations *export_ops = inode->i_sb->s_export_op; 280f501912aSBen Myers 281c3765016SChristoph Hellwig if (export_ops->commit_metadata) 282c3765016SChristoph Hellwig return export_ops->commit_metadata(inode); 283c3765016SChristoph Hellwig return sync_inode_metadata(inode, 1); 284f501912aSBen Myers } 2856c0a654dSJ. Bruce Fields 28657f64034STrond Myklebust static int 28757f64034STrond Myklebust commit_metadata(struct svc_fh *fhp) 28857f64034STrond Myklebust { 28957f64034STrond Myklebust struct inode *inode = d_inode(fhp->fh_dentry); 29057f64034STrond Myklebust 29157f64034STrond Myklebust if (!EX_ISSYNC(fhp->fh_export)) 29257f64034STrond Myklebust return 0; 29357f64034STrond Myklebust return commit_inode_metadata(inode); 29457f64034STrond Myklebust } 29557f64034STrond Myklebust 2961da177e4SLinus Torvalds /* 297818e5a22SChristoph Hellwig * Go over the attributes and take care of the small differences between 298818e5a22SChristoph Hellwig * NFS semantics and what Linux expects. 299818e5a22SChristoph Hellwig */ 300818e5a22SChristoph Hellwig static void 301818e5a22SChristoph Hellwig nfsd_sanitize_attrs(struct inode *inode, struct iattr *iap) 302818e5a22SChristoph Hellwig { 30300801cd9SNeilBrown /* Ignore mode updates on symlinks */ 30400801cd9SNeilBrown if (S_ISLNK(inode->i_mode)) 30500801cd9SNeilBrown iap->ia_valid &= ~ATTR_MODE; 30600801cd9SNeilBrown 307818e5a22SChristoph Hellwig /* sanitize the mode change */ 308818e5a22SChristoph Hellwig if (iap->ia_valid & ATTR_MODE) { 309818e5a22SChristoph Hellwig iap->ia_mode &= S_IALLUGO; 310818e5a22SChristoph Hellwig iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); 311818e5a22SChristoph Hellwig } 312818e5a22SChristoph Hellwig 313818e5a22SChristoph Hellwig /* Revoke setuid/setgid on chown */ 314818e5a22SChristoph Hellwig if (!S_ISDIR(inode->i_mode) && 315c4fa6d7cSStanislav Kholmanskikh ((iap->ia_valid & ATTR_UID) || (iap->ia_valid & ATTR_GID))) { 316818e5a22SChristoph Hellwig iap->ia_valid |= ATTR_KILL_PRIV; 317818e5a22SChristoph Hellwig if (iap->ia_valid & ATTR_MODE) { 318818e5a22SChristoph Hellwig /* we're setting mode too, just clear the s*id bits */ 319818e5a22SChristoph Hellwig iap->ia_mode &= ~S_ISUID; 320818e5a22SChristoph Hellwig if (iap->ia_mode & S_IXGRP) 321818e5a22SChristoph Hellwig iap->ia_mode &= ~S_ISGID; 322818e5a22SChristoph Hellwig } else { 323818e5a22SChristoph Hellwig /* set ATTR_KILL_* bits and let VFS handle it */ 324818e5a22SChristoph Hellwig iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); 325818e5a22SChristoph Hellwig } 326818e5a22SChristoph Hellwig } 327818e5a22SChristoph Hellwig } 328818e5a22SChristoph Hellwig 3290839ffb8SJ. Bruce Fields static __be32 3300839ffb8SJ. Bruce Fields nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp, 3310839ffb8SJ. Bruce Fields struct iattr *iap) 3320839ffb8SJ. Bruce Fields { 3330839ffb8SJ. Bruce Fields struct inode *inode = d_inode(fhp->fh_dentry); 3340839ffb8SJ. Bruce Fields 3350839ffb8SJ. Bruce Fields if (iap->ia_size < inode->i_size) { 3360839ffb8SJ. Bruce Fields __be32 err; 3370839ffb8SJ. Bruce Fields 3380839ffb8SJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 3390839ffb8SJ. Bruce Fields NFSD_MAY_TRUNC | NFSD_MAY_OWNER_OVERRIDE); 3400839ffb8SJ. Bruce Fields if (err) 3410839ffb8SJ. Bruce Fields return err; 3420839ffb8SJ. Bruce Fields } 343f7e33bdbSJeff Layton return nfserrno(get_write_access(inode)); 3440839ffb8SJ. Bruce Fields } 3450839ffb8SJ. Bruce Fields 346c0aa1913SChuck Lever static int __nfsd_setattr(struct dentry *dentry, struct iattr *iap) 347c0aa1913SChuck Lever { 348c0aa1913SChuck Lever int host_err; 349c0aa1913SChuck Lever 350c0aa1913SChuck Lever if (iap->ia_valid & ATTR_SIZE) { 351818e5a22SChristoph Hellwig /* 352c0aa1913SChuck Lever * RFC5661, Section 18.30.4: 353c0aa1913SChuck Lever * Changing the size of a file with SETATTR indirectly 354c0aa1913SChuck Lever * changes the time_modify and change attributes. 355c0aa1913SChuck Lever * 356c0aa1913SChuck Lever * (and similar for the older RFCs) 357c0aa1913SChuck Lever */ 358c0aa1913SChuck Lever struct iattr size_attr = { 359c0aa1913SChuck Lever .ia_valid = ATTR_SIZE | ATTR_CTIME | ATTR_MTIME, 360c0aa1913SChuck Lever .ia_size = iap->ia_size, 361c0aa1913SChuck Lever }; 362c0aa1913SChuck Lever 363c0aa1913SChuck Lever if (iap->ia_size < 0) 364c0aa1913SChuck Lever return -EFBIG; 365c0aa1913SChuck Lever 366c0aa1913SChuck Lever host_err = notify_change(&init_user_ns, dentry, &size_attr, NULL); 367c0aa1913SChuck Lever if (host_err) 368c0aa1913SChuck Lever return host_err; 369c0aa1913SChuck Lever iap->ia_valid &= ~ATTR_SIZE; 370c0aa1913SChuck Lever 371c0aa1913SChuck Lever /* 372c0aa1913SChuck Lever * Avoid the additional setattr call below if the only other 373c0aa1913SChuck Lever * attribute that the client sends is the mtime, as we update 374c0aa1913SChuck Lever * it as part of the size change above. 375c0aa1913SChuck Lever */ 376c0aa1913SChuck Lever if ((iap->ia_valid & ~ATTR_MTIME) == 0) 377c0aa1913SChuck Lever return 0; 378c0aa1913SChuck Lever } 379c0aa1913SChuck Lever 380c0aa1913SChuck Lever if (!iap->ia_valid) 381c0aa1913SChuck Lever return 0; 382c0aa1913SChuck Lever 383c0aa1913SChuck Lever iap->ia_valid |= ATTR_CTIME; 384c0aa1913SChuck Lever return notify_change(&init_user_ns, dentry, iap, NULL); 385c0aa1913SChuck Lever } 386c0aa1913SChuck Lever 387c0aa1913SChuck Lever /** 388c0aa1913SChuck Lever * nfsd_setattr - Set various file attributes. 389c0aa1913SChuck Lever * @rqstp: controlling RPC transaction 390c0aa1913SChuck Lever * @fhp: filehandle of target 391c0aa1913SChuck Lever * @attr: attributes to set 392c0aa1913SChuck Lever * @check_guard: set to 1 if guardtime is a valid timestamp 393c0aa1913SChuck Lever * @guardtime: do not act if ctime.tv_sec does not match this timestamp 394c0aa1913SChuck Lever * 395c0aa1913SChuck Lever * This call may adjust the contents of @attr (in particular, this 396c0aa1913SChuck Lever * call may change the bits in the na_iattr.ia_valid field). 397c0aa1913SChuck Lever * 398c0aa1913SChuck Lever * Returns nfs_ok on success, otherwise an NFS status code is 399c0aa1913SChuck Lever * returned. Caller must release @fhp by calling fh_put in either 400c0aa1913SChuck Lever * case. 4011da177e4SLinus Torvalds */ 4026264d69dSAl Viro __be32 4037fe2a71dSNeilBrown nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, 4047fe2a71dSNeilBrown struct nfsd_attrs *attr, 4052a1aa489SArnd Bergmann int check_guard, time64_t guardtime) 4061da177e4SLinus Torvalds { 4071da177e4SLinus Torvalds struct dentry *dentry; 4081da177e4SLinus Torvalds struct inode *inode; 4097fe2a71dSNeilBrown struct iattr *iap = attr->na_iattr; 4108837abcaSMiklos Szeredi int accmode = NFSD_MAY_SATTR; 411175a4eb7SAl Viro umode_t ftype = 0; 4126264d69dSAl Viro __be32 err; 413c0aa1913SChuck Lever int host_err; 4149f67f189SJ. Bruce Fields bool get_write_count; 415758e99feSChristoph Hellwig bool size_change = (iap->ia_valid & ATTR_SIZE); 41634b91ddaSChuck Lever int retries; 4171da177e4SLinus Torvalds 418255fbca6Szhengbin if (iap->ia_valid & ATTR_SIZE) { 4198837abcaSMiklos Szeredi accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; 4201da177e4SLinus Torvalds ftype = S_IFREG; 421255fbca6Szhengbin } 422255fbca6Szhengbin 423255fbca6Szhengbin /* 424255fbca6Szhengbin * If utimes(2) and friends are called with times not NULL, we should 425255fbca6Szhengbin * not set NFSD_MAY_WRITE bit. Otherwise fh_verify->nfsd_permission 426e977cc83SGeert Uytterhoeven * will return EACCES, when the caller's effective UID does not match 427255fbca6Szhengbin * the owner of the file, and the caller is not privileged. In this 428255fbca6Szhengbin * situation, we should return EPERM(notify_change will return this). 429255fbca6Szhengbin */ 430255fbca6Szhengbin if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME)) { 431255fbca6Szhengbin accmode |= NFSD_MAY_OWNER_OVERRIDE; 432255fbca6Szhengbin if (!(iap->ia_valid & (ATTR_ATIME_SET | ATTR_MTIME_SET))) 433255fbca6Szhengbin accmode |= NFSD_MAY_WRITE; 434255fbca6Szhengbin } 4351da177e4SLinus Torvalds 4369f67f189SJ. Bruce Fields /* Callers that do fh_verify should do the fh_want_write: */ 4379f67f189SJ. Bruce Fields get_write_count = !fhp->fh_dentry; 4389f67f189SJ. Bruce Fields 4391da177e4SLinus Torvalds /* Get inode */ 4401da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 44115b7a1b8SNeilBrown if (err) 442758e99feSChristoph Hellwig return err; 4439f67f189SJ. Bruce Fields if (get_write_count) { 4449f67f189SJ. Bruce Fields host_err = fh_want_write(fhp); 4459f67f189SJ. Bruce Fields if (host_err) 446758e99feSChristoph Hellwig goto out; 4479f67f189SJ. Bruce Fields } 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds dentry = fhp->fh_dentry; 4502b0143b5SDavid Howells inode = d_inode(dentry); 4511da177e4SLinus Torvalds 452818e5a22SChristoph Hellwig nfsd_sanitize_attrs(inode, iap); 4531da177e4SLinus Torvalds 454758e99feSChristoph Hellwig if (check_guard && guardtime != inode->i_ctime.tv_sec) 455758e99feSChristoph Hellwig return nfserr_notsync; 456758e99feSChristoph Hellwig 457f0c63124SChristoph Hellwig /* 45841f53350SChristoph Hellwig * The size case is special, it changes the file in addition to the 459783112f7SChristoph Hellwig * attributes, and file systems don't expect it to be mixed with 460783112f7SChristoph Hellwig * "random" attribute changes. We thus split out the size change 461783112f7SChristoph Hellwig * into a separate call to ->setattr, and do the rest as a separate 462783112f7SChristoph Hellwig * setattr call. 463f0c63124SChristoph Hellwig */ 464758e99feSChristoph Hellwig if (size_change) { 4650839ffb8SJ. Bruce Fields err = nfsd_get_write_access(rqstp, fhp, iap); 4660839ffb8SJ. Bruce Fields if (err) 467758e99feSChristoph Hellwig return err; 468783112f7SChristoph Hellwig } 46941f53350SChristoph Hellwig 470bb4d53d6SNeilBrown inode_lock(inode); 47134b91ddaSChuck Lever for (retries = 1;;) { 472c0aa1913SChuck Lever host_err = __nfsd_setattr(dentry, iap); 47334b91ddaSChuck Lever if (host_err != -EAGAIN || !retries--) 47434b91ddaSChuck Lever break; 47534b91ddaSChuck Lever if (!nfsd_wait_for_delegreturn(rqstp, inode)) 47634b91ddaSChuck Lever break; 47734b91ddaSChuck Lever } 478d6a97d3fSNeilBrown if (attr->na_seclabel && attr->na_seclabel->len) 479d6a97d3fSNeilBrown attr->na_labelerr = security_inode_setsecctx(dentry, 480d6a97d3fSNeilBrown attr->na_seclabel->data, attr->na_seclabel->len); 481c0cbe707SNeilBrown if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && attr->na_pacl) 482c0cbe707SNeilBrown attr->na_aclerr = set_posix_acl(&init_user_ns, 483c0cbe707SNeilBrown inode, ACL_TYPE_ACCESS, 484c0cbe707SNeilBrown attr->na_pacl); 485c0cbe707SNeilBrown if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && 486c0cbe707SNeilBrown !attr->na_aclerr && attr->na_dpacl && S_ISDIR(inode->i_mode)) 487c0cbe707SNeilBrown attr->na_aclerr = set_posix_acl(&init_user_ns, 488c0cbe707SNeilBrown inode, ACL_TYPE_DEFAULT, 489c0cbe707SNeilBrown attr->na_dpacl); 490bb4d53d6SNeilBrown inode_unlock(inode); 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; 523c7c7a1a1STycho Andersen if (vfs_getxattr(&init_user_ns, dentry, NFSD_JUNCTION_XATTR_NAME, 524c7c7a1a1STycho Andersen NULL, 0) <= 0) 52511fcee02STrond Myklebust return 0; 52611fcee02STrond Myklebust return 1; 52711fcee02STrond Myklebust } 52818032ca0SDavid Quigley 529a2f4c3faSTrond Myklebust static struct nfsd4_compound_state *nfsd4_get_cstate(struct svc_rqst *rqstp) 530a2f4c3faSTrond Myklebust { 531a2f4c3faSTrond Myklebust return &((struct nfsd4_compoundres *)rqstp->rq_resp)->cstate; 532a2f4c3faSTrond Myklebust } 533a2f4c3faSTrond Myklebust 534a2f4c3faSTrond Myklebust __be32 nfsd4_clone_file_range(struct svc_rqst *rqstp, 535a2f4c3faSTrond Myklebust struct nfsd_file *nf_src, u64 src_pos, 536a2f4c3faSTrond Myklebust struct nfsd_file *nf_dst, u64 dst_pos, 537a2f4c3faSTrond Myklebust u64 count, bool sync) 538ffa0160aSChristoph Hellwig { 539b66ae6ddSTrond Myklebust struct file *src = nf_src->nf_file; 540b66ae6ddSTrond Myklebust struct file *dst = nf_dst->nf_file; 541555dbf1aSTrond Myklebust errseq_t since; 54242ec3d4cSDarrick J. Wong loff_t cloned; 5431b28d756STrond Myklebust __be32 ret = 0; 54442ec3d4cSDarrick J. Wong 545555dbf1aSTrond Myklebust since = READ_ONCE(dst->f_wb_err); 546452ce659SDarrick J. Wong cloned = vfs_clone_file_range(src, src_pos, dst, dst_pos, count, 0); 5471b28d756STrond Myklebust if (cloned < 0) { 5481b28d756STrond Myklebust ret = nfserrno(cloned); 5491b28d756STrond Myklebust goto out_err; 5501b28d756STrond Myklebust } 5511b28d756STrond Myklebust if (count && cloned != count) { 5521b28d756STrond Myklebust ret = nfserrno(-EINVAL); 5531b28d756STrond Myklebust goto out_err; 5541b28d756STrond Myklebust } 555a25e3726STrond Myklebust if (sync) { 556a25e3726STrond Myklebust loff_t dst_end = count ? dst_pos + count - 1 : LLONG_MAX; 557a25e3726STrond Myklebust int status = vfs_fsync_range(dst, dst_pos, dst_end, 0); 55857f64034STrond Myklebust 55957f64034STrond Myklebust if (!status) 560555dbf1aSTrond Myklebust status = filemap_check_wb_err(dst->f_mapping, since); 561555dbf1aSTrond Myklebust if (!status) 56257f64034STrond Myklebust status = commit_inode_metadata(file_inode(src)); 5631b28d756STrond Myklebust if (status < 0) { 56475acacb6SChuck Lever struct nfsd_net *nn = net_generic(nf_dst->nf_net, 56575acacb6SChuck Lever nfsd_net_id); 56675acacb6SChuck Lever 567a2f4c3faSTrond Myklebust trace_nfsd_clone_file_range_err(rqstp, 568a2f4c3faSTrond Myklebust &nfsd4_get_cstate(rqstp)->save_fh, 569a2f4c3faSTrond Myklebust src_pos, 570a2f4c3faSTrond Myklebust &nfsd4_get_cstate(rqstp)->current_fh, 571a2f4c3faSTrond Myklebust dst_pos, 572a2f4c3faSTrond Myklebust count, status); 57375acacb6SChuck Lever nfsd_reset_write_verifier(nn); 57475acacb6SChuck Lever trace_nfsd_writeverf_reset(nn, rqstp, status); 5751b28d756STrond Myklebust ret = nfserrno(status); 576a25e3726STrond Myklebust } 5771b28d756STrond Myklebust } 5781b28d756STrond Myklebust out_err: 5791b28d756STrond Myklebust return ret; 580ffa0160aSChristoph Hellwig } 581ffa0160aSChristoph Hellwig 58229ae7f9dSAnna Schumaker ssize_t nfsd_copy_file_range(struct file *src, u64 src_pos, struct file *dst, 58329ae7f9dSAnna Schumaker u64 dst_pos, u64 count) 58429ae7f9dSAnna Schumaker { 585868f9f2fSAmir Goldstein ssize_t ret; 58629ae7f9dSAnna Schumaker 58729ae7f9dSAnna Schumaker /* 58829ae7f9dSAnna Schumaker * Limit copy to 4MB to prevent indefinitely blocking an nfsd 58929ae7f9dSAnna Schumaker * thread and client rpc slot. The choice of 4MB is somewhat 59029ae7f9dSAnna Schumaker * arbitrary. We might instead base this on r/wsize, or make it 59129ae7f9dSAnna Schumaker * tunable, or use a time instead of a byte limit, or implement 59229ae7f9dSAnna Schumaker * asynchronous copy. In theory a client could also recognize a 59329ae7f9dSAnna Schumaker * limit like this and pipeline multiple COPY requests. 59429ae7f9dSAnna Schumaker */ 59529ae7f9dSAnna Schumaker count = min_t(u64, count, 1 << 22); 596868f9f2fSAmir Goldstein ret = vfs_copy_file_range(src, src_pos, dst, dst_pos, count, 0); 597868f9f2fSAmir Goldstein 598868f9f2fSAmir Goldstein if (ret == -EOPNOTSUPP || ret == -EXDEV) 599868f9f2fSAmir Goldstein ret = generic_copy_file_range(src, src_pos, dst, dst_pos, 600868f9f2fSAmir Goldstein count, 0); 601868f9f2fSAmir Goldstein return ret; 60229ae7f9dSAnna Schumaker } 60329ae7f9dSAnna Schumaker 60495d871f0SAnna Schumaker __be32 nfsd4_vfs_fallocate(struct svc_rqst *rqstp, struct svc_fh *fhp, 60595d871f0SAnna Schumaker struct file *file, loff_t offset, loff_t len, 60695d871f0SAnna Schumaker int flags) 60795d871f0SAnna Schumaker { 60895d871f0SAnna Schumaker int error; 60995d871f0SAnna Schumaker 61095d871f0SAnna Schumaker if (!S_ISREG(file_inode(file)->i_mode)) 61195d871f0SAnna Schumaker return nfserr_inval; 61295d871f0SAnna Schumaker 61395d871f0SAnna Schumaker error = vfs_fallocate(file, flags, offset, len); 61495d871f0SAnna Schumaker if (!error) 61595d871f0SAnna Schumaker error = commit_metadata(fhp); 61695d871f0SAnna Schumaker 61795d871f0SAnna Schumaker return nfserrno(error); 61895d871f0SAnna Schumaker } 6196a85d6c7SJ. Bruce Fields #endif /* defined(CONFIG_NFSD_V4) */ 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds /* 6221da177e4SLinus Torvalds * Check server access rights to a file system object 6231da177e4SLinus Torvalds */ 6241da177e4SLinus Torvalds struct accessmap { 6251da177e4SLinus Torvalds u32 access; 6261da177e4SLinus Torvalds int how; 6271da177e4SLinus Torvalds }; 6281da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 6298837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6308837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6318837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, 6328837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, 6331da177e4SLinus Torvalds 634c11d7fd1SFrank van der Linden #ifdef CONFIG_NFSD_V4 635c11d7fd1SFrank van der Linden { NFS4_ACCESS_XAREAD, NFSD_MAY_READ }, 636c11d7fd1SFrank van der Linden { NFS4_ACCESS_XAWRITE, NFSD_MAY_WRITE }, 637c11d7fd1SFrank van der Linden { NFS4_ACCESS_XALIST, NFSD_MAY_READ }, 638c11d7fd1SFrank van der Linden #endif 639c11d7fd1SFrank van der Linden 6401da177e4SLinus Torvalds { 0, 0 } 6411da177e4SLinus Torvalds }; 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 6448837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6458837abcaSMiklos Szeredi { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, 6468837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, 6478837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, 6488837abcaSMiklos Szeredi { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, 6491da177e4SLinus Torvalds 650c11d7fd1SFrank van der Linden #ifdef CONFIG_NFSD_V4 651c11d7fd1SFrank van der Linden { NFS4_ACCESS_XAREAD, NFSD_MAY_READ }, 652c11d7fd1SFrank van der Linden { NFS4_ACCESS_XAWRITE, NFSD_MAY_WRITE }, 653c11d7fd1SFrank van der Linden { NFS4_ACCESS_XALIST, NFSD_MAY_READ }, 654c11d7fd1SFrank van der Linden #endif 655c11d7fd1SFrank van der Linden 6561da177e4SLinus Torvalds { 0, 0 } 6571da177e4SLinus Torvalds }; 6581da177e4SLinus Torvalds 6591da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 6601da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 6611da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 6621da177e4SLinus Torvalds * (which really, the server doesn't care about). So 6631da177e4SLinus Torvalds * We provide simple access checking for them, looking 6641da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 6651da177e4SLinus Torvalds * filesystem checks 6661da177e4SLinus Torvalds */ 6678837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6688837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6698837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6708837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds { 0, 0 } 6731da177e4SLinus Torvalds }; 6741da177e4SLinus Torvalds 6756264d69dSAl Viro __be32 6761da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 6771da177e4SLinus Torvalds { 6781da177e4SLinus Torvalds struct accessmap *map; 6791da177e4SLinus Torvalds struct svc_export *export; 6801da177e4SLinus Torvalds struct dentry *dentry; 6811da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 6826264d69dSAl Viro __be32 error; 6831da177e4SLinus Torvalds 6848837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 6851da177e4SLinus Torvalds if (error) 6861da177e4SLinus Torvalds goto out; 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds export = fhp->fh_export; 6891da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6901da177e4SLinus Torvalds 691e36cb0b8SDavid Howells if (d_is_reg(dentry)) 6921da177e4SLinus Torvalds map = nfs3_regaccess; 693e36cb0b8SDavid Howells else if (d_is_dir(dentry)) 6941da177e4SLinus Torvalds map = nfs3_diraccess; 6951da177e4SLinus Torvalds else 6961da177e4SLinus Torvalds map = nfs3_anyaccess; 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds query = *access; 7001da177e4SLinus Torvalds for (; map->access; map++) { 7011da177e4SLinus Torvalds if (map->access & query) { 7026264d69dSAl Viro __be32 err2; 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds sresult |= map->access; 7051da177e4SLinus Torvalds 7060ec757dfSJ. Bruce Fields err2 = nfsd_permission(rqstp, export, dentry, map->how); 7071da177e4SLinus Torvalds switch (err2) { 7081da177e4SLinus Torvalds case nfs_ok: 7091da177e4SLinus Torvalds result |= map->access; 7101da177e4SLinus Torvalds break; 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 7131da177e4SLinus Torvalds * rather than an error occurred */ 7141da177e4SLinus Torvalds case nfserr_rofs: 7151da177e4SLinus Torvalds case nfserr_acces: 7161da177e4SLinus Torvalds case nfserr_perm: 7171da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 7181da177e4SLinus Torvalds break; 7191da177e4SLinus Torvalds default: 7201da177e4SLinus Torvalds error = err2; 7211da177e4SLinus Torvalds goto out; 7221da177e4SLinus Torvalds } 7231da177e4SLinus Torvalds } 7241da177e4SLinus Torvalds } 7251da177e4SLinus Torvalds *access = result; 7261da177e4SLinus Torvalds if (supported) 7271da177e4SLinus Torvalds *supported = sresult; 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds out: 7301da177e4SLinus Torvalds return error; 7311da177e4SLinus Torvalds } 7321da177e4SLinus Torvalds 73365294c1fSJeff Layton int nfsd_open_break_lease(struct inode *inode, int access) 734105f4622SJ. Bruce Fields { 735105f4622SJ. Bruce Fields unsigned int mode; 7361da177e4SLinus Torvalds 737105f4622SJ. Bruce Fields if (access & NFSD_MAY_NOT_BREAK_LEASE) 738105f4622SJ. Bruce Fields return 0; 739105f4622SJ. Bruce Fields mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; 740105f4622SJ. Bruce Fields return break_lease(inode, mode | O_NONBLOCK); 741105f4622SJ. Bruce Fields } 7421da177e4SLinus Torvalds 7431da177e4SLinus Torvalds /* 7441da177e4SLinus Torvalds * Open an existing file or directory. 745999448a8SBernd Schubert * The may_flags argument indicates the type of open (read/write/lock) 746999448a8SBernd Schubert * and additional flags. 7471da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 7481da177e4SLinus Torvalds */ 74965294c1fSJeff Layton static __be32 75065294c1fSJeff Layton __nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, 751999448a8SBernd Schubert int may_flags, struct file **filp) 7521da177e4SLinus Torvalds { 753765927b2SAl Viro struct path path; 7541da177e4SLinus Torvalds struct inode *inode; 7558519f994SKinglong Mee struct file *file; 7566264d69dSAl Viro int flags = O_RDONLY|O_LARGEFILE; 7576264d69dSAl Viro __be32 err; 75891885258SJeff Layton int host_err = 0; 7591da177e4SLinus Torvalds 760765927b2SAl Viro path.mnt = fhp->fh_export->ex_path.mnt; 761765927b2SAl Viro path.dentry = fhp->fh_dentry; 7622b0143b5SDavid Howells inode = d_inode(path.dentry); 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds err = nfserr_perm; 765999448a8SBernd Schubert if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE)) 7661da177e4SLinus Torvalds goto out; 7671da177e4SLinus Torvalds 7681da177e4SLinus Torvalds if (!inode->i_fop) 7691da177e4SLinus Torvalds goto out; 7701da177e4SLinus Torvalds 771999448a8SBernd Schubert host_err = nfsd_open_break_lease(inode, may_flags); 7726264d69dSAl Viro if (host_err) /* NOMEM or WOULDBLOCK */ 7731da177e4SLinus Torvalds goto out_nfserr; 7741da177e4SLinus Torvalds 775999448a8SBernd Schubert if (may_flags & NFSD_MAY_WRITE) { 776999448a8SBernd Schubert if (may_flags & NFSD_MAY_READ) 7779ecb6a08SJ. Bruce Fields flags = O_RDWR|O_LARGEFILE; 7789ecb6a08SJ. Bruce Fields else 7791da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 7801da177e4SLinus Torvalds } 781999448a8SBernd Schubert 7828519f994SKinglong Mee file = dentry_open(&path, flags, current_cred()); 7838519f994SKinglong Mee if (IS_ERR(file)) { 7848519f994SKinglong Mee host_err = PTR_ERR(file); 7858519f994SKinglong Mee goto out_nfserr; 78606effdbbSBernd Schubert } 78706effdbbSBernd Schubert 7886035a27bSAl Viro host_err = ima_file_check(file, may_flags); 7898519f994SKinglong Mee if (host_err) { 790fd891454SChristoph Hellwig fput(file); 7918519f994SKinglong Mee goto out_nfserr; 7928519f994SKinglong Mee } 7938519f994SKinglong Mee 7948519f994SKinglong Mee if (may_flags & NFSD_MAY_64BIT_COOKIE) 7958519f994SKinglong Mee file->f_mode |= FMODE_64BITHASH; 7968519f994SKinglong Mee else 7978519f994SKinglong Mee file->f_mode |= FMODE_32BITHASH; 7988519f994SKinglong Mee 7998519f994SKinglong Mee *filp = file; 8001da177e4SLinus Torvalds out_nfserr: 8016264d69dSAl Viro err = nfserrno(host_err); 8021da177e4SLinus Torvalds out: 80365294c1fSJeff Layton return err; 80465294c1fSJeff Layton } 80565294c1fSJeff Layton 80665294c1fSJeff Layton __be32 80765294c1fSJeff Layton nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, 80865294c1fSJeff Layton int may_flags, struct file **filp) 80965294c1fSJeff Layton { 81065294c1fSJeff Layton __be32 err; 81112bcbd40SJeff Layton bool retried = false; 81265294c1fSJeff Layton 81365294c1fSJeff Layton validate_process_creds(); 81465294c1fSJeff Layton /* 81565294c1fSJeff Layton * If we get here, then the client has already done an "open", 81665294c1fSJeff Layton * and (hopefully) checked permission - so allow OWNER_OVERRIDE 81765294c1fSJeff Layton * in case a chmod has now revoked permission. 81865294c1fSJeff Layton * 81965294c1fSJeff Layton * Arguably we should also allow the owner override for 82065294c1fSJeff Layton * directories, but we never have and it doesn't seem to have 82165294c1fSJeff Layton * caused anyone a problem. If we were to change this, note 82265294c1fSJeff Layton * also that our filldir callbacks would need a variant of 82365294c1fSJeff Layton * lookup_one_len that doesn't check permissions. 82465294c1fSJeff Layton */ 82565294c1fSJeff Layton if (type == S_IFREG) 82665294c1fSJeff Layton may_flags |= NFSD_MAY_OWNER_OVERRIDE; 82712bcbd40SJeff Layton retry: 82865294c1fSJeff Layton err = fh_verify(rqstp, fhp, type, may_flags); 82912bcbd40SJeff Layton if (!err) { 83065294c1fSJeff Layton err = __nfsd_open(rqstp, fhp, type, may_flags, filp); 83112bcbd40SJeff Layton if (err == nfserr_stale && !retried) { 83212bcbd40SJeff Layton retried = true; 83312bcbd40SJeff Layton fh_put(fhp); 83412bcbd40SJeff Layton goto retry; 83512bcbd40SJeff Layton } 83612bcbd40SJeff Layton } 837e0e81739SDavid Howells validate_process_creds(); 8381da177e4SLinus Torvalds return err; 8391da177e4SLinus Torvalds } 8401da177e4SLinus Torvalds 841f4d84c52SChuck Lever /** 842f4d84c52SChuck Lever * nfsd_open_verified - Open a regular file for the filecache 843f4d84c52SChuck Lever * @rqstp: RPC request 844f4d84c52SChuck Lever * @fhp: NFS filehandle of the file to open 845f4d84c52SChuck Lever * @may_flags: internal permission flags 846f4d84c52SChuck Lever * @filp: OUT: open "struct file *" 847f4d84c52SChuck Lever * 848f4d84c52SChuck Lever * Returns an nfsstat value in network byte order. 849f4d84c52SChuck Lever */ 85065294c1fSJeff Layton __be32 851f4d84c52SChuck Lever nfsd_open_verified(struct svc_rqst *rqstp, struct svc_fh *fhp, int may_flags, 852f4d84c52SChuck Lever struct file **filp) 85365294c1fSJeff Layton { 85465294c1fSJeff Layton __be32 err; 85565294c1fSJeff Layton 85665294c1fSJeff Layton validate_process_creds(); 857f4d84c52SChuck Lever err = __nfsd_open(rqstp, fhp, S_IFREG, may_flags, filp); 85865294c1fSJeff Layton validate_process_creds(); 85965294c1fSJeff Layton return err; 86065294c1fSJeff Layton } 86165294c1fSJeff Layton 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; 872bfbfb618SAl Viro struct page *page = buf->page; // may be a compound one 873bfbfb618SAl Viro unsigned offset = buf->offset; 874*ac8db824SChuck Lever struct page *last_page; 8751da177e4SLinus Torvalds 876*ac8db824SChuck Lever last_page = page + (offset + sd->len - 1) / PAGE_SIZE; 877*ac8db824SChuck Lever for (page += offset / PAGE_SIZE; page <= last_page; page++) 878*ac8db824SChuck Lever svc_rqst_replace_page(rqstp, page); 879bfbfb618SAl Viro if (rqstp->rq_res.page_len == 0) // first call 880bfbfb618SAl Viro rqstp->rq_res.page_base = offset % PAGE_SIZE; 881c7e0b781SChuck Lever rqstp->rq_res.page_len += sd->len; 882c7e0b781SChuck Lever return sd->len; 8831da177e4SLinus Torvalds } 8841da177e4SLinus Torvalds 885cf8208d0SJens Axboe static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, 886cf8208d0SJens Axboe struct splice_desc *sd) 887cf8208d0SJens Axboe { 888cf8208d0SJens Axboe return __splice_from_pipe(pipe, sd, nfsd_splice_actor); 889cf8208d0SJens Axboe } 890cf8208d0SJens Axboe 89183a63072STrond Myklebust static u32 nfsd_eof_on_read(struct file *file, loff_t offset, ssize_t len, 89283a63072STrond Myklebust size_t expected) 89383a63072STrond Myklebust { 89483a63072STrond Myklebust if (expected != 0 && len == 0) 89583a63072STrond Myklebust return 1; 89683a63072STrond Myklebust if (offset+len >= i_size_read(file_inode(file))) 89783a63072STrond Myklebust return 1; 89883a63072STrond Myklebust return 0; 89983a63072STrond Myklebust } 90083a63072STrond Myklebust 90187c5942eSChuck Lever static __be32 nfsd_finish_read(struct svc_rqst *rqstp, struct svc_fh *fhp, 90287c5942eSChuck Lever struct file *file, loff_t offset, 90383a63072STrond Myklebust unsigned long *count, u32 *eof, ssize_t host_err) 9041da177e4SLinus Torvalds { 905dc97618dSJ. Bruce Fields if (host_err >= 0) { 90620ad856eSAmir Goldstein nfsd_stats_io_read_add(fhp->fh_export, host_err); 90783a63072STrond Myklebust *eof = nfsd_eof_on_read(file, offset, host_err, *count); 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, 91983a63072STrond Myklebust struct file *file, loff_t offset, unsigned long *count, 92083a63072STrond Myklebust u32 *eof) 921dc97618dSJ. Bruce Fields { 922cf8208d0SJens Axboe struct splice_desc sd = { 923cf8208d0SJens Axboe .len = 0, 924cf8208d0SJens Axboe .total_len = *count, 925cf8208d0SJens Axboe .pos = offset, 926cf8208d0SJens Axboe .u.data = rqstp, 927cf8208d0SJens Axboe }; 92883a63072STrond Myklebust ssize_t host_err; 929cf8208d0SJens Axboe 93087c5942eSChuck Lever trace_nfsd_read_splice(rqstp, fhp, offset, *count); 931afc59400SJ. Bruce Fields rqstp->rq_next_page = rqstp->rq_respages + 1; 932cf8208d0SJens Axboe host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); 93383a63072STrond Myklebust return nfsd_finish_read(rqstp, fhp, file, offset, count, eof, host_err); 934dc97618dSJ. Bruce Fields } 935dc97618dSJ. Bruce Fields 93687c5942eSChuck Lever __be32 nfsd_readv(struct svc_rqst *rqstp, struct svc_fh *fhp, 93787c5942eSChuck Lever struct file *file, loff_t offset, 93883a63072STrond Myklebust struct kvec *vec, int vlen, unsigned long *count, 93983a63072STrond Myklebust u32 *eof) 940dc97618dSJ. Bruce Fields { 94173da852eSChristoph Hellwig struct iov_iter iter; 94283a63072STrond Myklebust loff_t ppos = offset; 94383a63072STrond Myklebust ssize_t host_err; 944dc97618dSJ. Bruce Fields 94587c5942eSChuck Lever trace_nfsd_read_vector(rqstp, fhp, offset, *count); 946aa563d7bSDavid Howells iov_iter_kvec(&iter, READ, vec, vlen, *count); 94783a63072STrond Myklebust host_err = vfs_iter_read(file, &iter, &ppos, 0); 94883a63072STrond Myklebust return nfsd_finish_read(rqstp, fhp, file, offset, count, eof, host_err); 9491da177e4SLinus Torvalds } 9501da177e4SLinus Torvalds 951d911df7bSJ. Bruce Fields /* 952d911df7bSJ. Bruce Fields * Gathered writes: If another process is currently writing to the file, 953d911df7bSJ. Bruce Fields * there's a high chance this is another nfsd (triggered by a bulk write 954d911df7bSJ. Bruce Fields * from a client's biod). Rather than syncing the file with each write 955d911df7bSJ. Bruce Fields * request, we sleep for 10 msec. 956d911df7bSJ. Bruce Fields * 957d911df7bSJ. Bruce Fields * I don't know if this roughly approximates C. Juszak's idea of 958d911df7bSJ. Bruce Fields * gathered writes, but it's a nice and simple solution (IMHO), and it 959d911df7bSJ. Bruce Fields * seems to work:-) 960d911df7bSJ. Bruce Fields * 961d911df7bSJ. Bruce Fields * Note: we do this only in the NFSv2 case, since v3 and higher have a 962d911df7bSJ. Bruce Fields * better tool (separate unstable writes and commits) for solving this 963d911df7bSJ. Bruce Fields * problem. 964d911df7bSJ. Bruce Fields */ 965d911df7bSJ. Bruce Fields static int wait_for_concurrent_writes(struct file *file) 966d911df7bSJ. Bruce Fields { 967496ad9aaSAl Viro struct inode *inode = file_inode(file); 968d911df7bSJ. Bruce Fields static ino_t last_ino; 969d911df7bSJ. Bruce Fields static dev_t last_dev; 970d911df7bSJ. Bruce Fields int err = 0; 971d911df7bSJ. Bruce Fields 972d911df7bSJ. Bruce Fields if (atomic_read(&inode->i_writecount) > 1 973d911df7bSJ. Bruce Fields || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 974d911df7bSJ. Bruce Fields dprintk("nfsd: write defer %d\n", task_pid_nr(current)); 975d911df7bSJ. Bruce Fields msleep(10); 976d911df7bSJ. Bruce Fields dprintk("nfsd: write resume %d\n", task_pid_nr(current)); 977d911df7bSJ. Bruce Fields } 978d911df7bSJ. Bruce Fields 979d911df7bSJ. Bruce Fields if (inode->i_state & I_DIRTY) { 980d911df7bSJ. Bruce Fields dprintk("nfsd: write sync %d\n", task_pid_nr(current)); 9818018ab05SChristoph Hellwig err = vfs_fsync(file, 0); 982d911df7bSJ. Bruce Fields } 983d911df7bSJ. Bruce Fields last_ino = inode->i_ino; 984d911df7bSJ. Bruce Fields last_dev = inode->i_sb->s_dev; 985d911df7bSJ. Bruce Fields return err; 986d911df7bSJ. Bruce Fields } 987d911df7bSJ. Bruce Fields 988af90f707SChristoph Hellwig __be32 98916f8f894STrond Myklebust nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfsd_file *nf, 9901da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 99119e0663fSTrond Myklebust unsigned long *cnt, int stable, 99219e0663fSTrond Myklebust __be32 *verf) 9931da177e4SLinus Torvalds { 994fb7622c2SChuck Lever struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); 99516f8f894STrond Myklebust struct file *file = nf->nf_file; 99601cbf385STrond Myklebust struct super_block *sb = file_inode(file)->i_sb; 9971da177e4SLinus Torvalds struct svc_export *exp; 99873da852eSChristoph Hellwig struct iov_iter iter; 999555dbf1aSTrond Myklebust errseq_t since; 1000d890be15SChuck Lever __be32 nfserr; 10016264d69dSAl Viro int host_err; 100248e03bc5STrond Myklebust int use_wgather; 1003e49dbbf3SKent Overstreet loff_t pos = offset; 100401cbf385STrond Myklebust unsigned long exp_op_flags = 0; 10058658452eSNeilBrown unsigned int pflags = current->flags; 1006ddef7ed2SChristoph Hellwig rwf_t flags = 0; 100701cbf385STrond Myklebust bool restore_flags = false; 10088658452eSNeilBrown 1009d890be15SChuck Lever trace_nfsd_write_opened(rqstp, fhp, offset, *cnt); 1010d890be15SChuck Lever 101101cbf385STrond Myklebust if (sb->s_export_op) 101201cbf385STrond Myklebust exp_op_flags = sb->s_export_op->flags; 101301cbf385STrond Myklebust 101401cbf385STrond Myklebust if (test_bit(RQ_LOCAL, &rqstp->rq_flags) && 101501cbf385STrond Myklebust !(exp_op_flags & EXPORT_OP_REMOTE_FS)) { 10168658452eSNeilBrown /* 1017a37b0715SNeilBrown * We want throttling in balance_dirty_pages() 1018a37b0715SNeilBrown * and shrink_inactive_list() to only consider 1019a37b0715SNeilBrown * the backingdev we are writing to, so that nfs to 10208658452eSNeilBrown * localhost doesn't cause nfsd to lock up due to all 10218658452eSNeilBrown * the client's dirty pages or its congested queue. 10228658452eSNeilBrown */ 1023a37b0715SNeilBrown current->flags |= PF_LOCAL_THROTTLE; 102401cbf385STrond Myklebust restore_flags = true; 102501cbf385STrond Myklebust } 10261da177e4SLinus Torvalds 10271da177e4SLinus Torvalds exp = fhp->fh_export; 102848e03bc5STrond Myklebust use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); 10291da177e4SLinus Torvalds 10301da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 103154bbb7d2SKinglong Mee stable = NFS_UNSTABLE; 10321da177e4SLinus Torvalds 103324368aadSChristoph Hellwig if (stable && !use_wgather) 103424368aadSChristoph Hellwig flags |= RWF_SYNC; 103524368aadSChristoph Hellwig 1036aa563d7bSDavid Howells iov_iter_kvec(&iter, WRITE, vec, vlen, *cnt); 1037555dbf1aSTrond Myklebust since = READ_ONCE(file->f_wb_err); 1038f11ad7aaSChuck Lever if (verf) 10393988a578SChuck Lever nfsd_copy_write_verifier(verf, nn); 104073da852eSChristoph Hellwig host_err = vfs_iter_write(file, &iter, &pos, flags); 10417bf94c6bSTrond Myklebust if (host_err < 0) { 10423988a578SChuck Lever nfsd_reset_write_verifier(nn); 104375acacb6SChuck Lever trace_nfsd_writeverf_reset(nn, rqstp, host_err); 1044e4636d53SJ. Bruce Fields goto out_nfserr; 10457bf94c6bSTrond Myklebust } 104609a80f2aSTrond Myklebust *cnt = host_err; 104720ad856eSAmir Goldstein nfsd_stats_io_write_add(exp, *cnt); 10482a12a9d7SEric Paris fsnotify_modify(file); 1049555dbf1aSTrond Myklebust host_err = filemap_check_wb_err(file->f_mapping, since); 1050555dbf1aSTrond Myklebust if (host_err < 0) 1051555dbf1aSTrond Myklebust goto out_nfserr; 10521da177e4SLinus Torvalds 1053bbf2f098STrond Myklebust if (stable && use_wgather) { 1054d911df7bSJ. Bruce Fields host_err = wait_for_concurrent_writes(file); 105575acacb6SChuck Lever if (host_err < 0) { 10563988a578SChuck Lever nfsd_reset_write_verifier(nn); 105775acacb6SChuck Lever trace_nfsd_writeverf_reset(nn, rqstp, host_err); 105875acacb6SChuck Lever } 1059bbf2f098STrond Myklebust } 10601da177e4SLinus Torvalds 1061e4636d53SJ. Bruce Fields out_nfserr: 1062d890be15SChuck Lever if (host_err >= 0) { 1063d890be15SChuck Lever trace_nfsd_write_io_done(rqstp, fhp, offset, *cnt); 1064d890be15SChuck Lever nfserr = nfs_ok; 1065d890be15SChuck Lever } else { 1066d890be15SChuck Lever trace_nfsd_write_err(rqstp, fhp, offset, host_err); 1067d890be15SChuck Lever nfserr = nfserrno(host_err); 1068d890be15SChuck Lever } 106901cbf385STrond Myklebust if (restore_flags) 1070a37b0715SNeilBrown current_restore_flags(pflags, PF_LOCAL_THROTTLE); 1071d890be15SChuck Lever return nfserr; 10721da177e4SLinus Torvalds } 10731da177e4SLinus Torvalds 1074dc97618dSJ. Bruce Fields /* 1075dc97618dSJ. Bruce Fields * Read data from a file. count must contain the requested read count 1076dc97618dSJ. Bruce Fields * on entry. On return, *count contains the number of bytes actually read. 1077dc97618dSJ. Bruce Fields * N.B. After this call fhp needs an fh_put 1078dc97618dSJ. Bruce Fields */ 1079dc97618dSJ. Bruce Fields __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, 108083a63072STrond Myklebust loff_t offset, struct kvec *vec, int vlen, unsigned long *count, 108183a63072STrond Myklebust u32 *eof) 1082dc97618dSJ. Bruce Fields { 108348cd7b51SJeff Layton struct nfsd_file *nf; 1084dc97618dSJ. Bruce Fields struct file *file; 1085dc97618dSJ. Bruce Fields __be32 err; 1086dc97618dSJ. Bruce Fields 1087f394b62bSChuck Lever trace_nfsd_read_start(rqstp, fhp, offset, *count); 108848cd7b51SJeff Layton err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_READ, &nf); 1089dc97618dSJ. Bruce Fields if (err) 1090dc97618dSJ. Bruce Fields return err; 1091dc97618dSJ. Bruce Fields 109248cd7b51SJeff Layton file = nf->nf_file; 1093a4058c5bSChristoph Hellwig if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &rqstp->rq_flags)) 109483a63072STrond Myklebust err = nfsd_splice_read(rqstp, fhp, file, offset, count, eof); 1095a4058c5bSChristoph Hellwig else 109683a63072STrond Myklebust err = nfsd_readv(rqstp, fhp, file, offset, vec, vlen, count, eof); 10976e8b50d1SJeff Layton 109848cd7b51SJeff Layton nfsd_file_put(nf); 1099dc97618dSJ. Bruce Fields 1100f394b62bSChuck Lever trace_nfsd_read_done(rqstp, fhp, offset, *count); 11016e8b50d1SJeff Layton 1102fa0a2126SJ. Bruce Fields return err; 1103fa0a2126SJ. Bruce Fields } 1104fa0a2126SJ. Bruce Fields 11051da177e4SLinus Torvalds /* 11061da177e4SLinus Torvalds * Write data to a file. 11071da177e4SLinus Torvalds * The stable flag requests synchronous writes. 11081da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 11091da177e4SLinus Torvalds */ 11106264d69dSAl Viro __be32 111152e380e0SKinglong Mee nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t offset, 111219e0663fSTrond Myklebust struct kvec *vec, int vlen, unsigned long *cnt, int stable, 111319e0663fSTrond Myklebust __be32 *verf) 11141da177e4SLinus Torvalds { 1115b4935239SJeff Layton struct nfsd_file *nf; 1116b4935239SJeff Layton __be32 err; 11171da177e4SLinus Torvalds 1118f394b62bSChuck Lever trace_nfsd_write_start(rqstp, fhp, offset, *cnt); 11196e8b50d1SJeff Layton 1120b4935239SJeff Layton err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_WRITE, &nf); 11211da177e4SLinus Torvalds if (err) 11221da177e4SLinus Torvalds goto out; 11231da177e4SLinus Torvalds 112416f8f894STrond Myklebust err = nfsd_vfs_write(rqstp, fhp, nf, offset, vec, 112519e0663fSTrond Myklebust vlen, cnt, stable, verf); 1126b4935239SJeff Layton nfsd_file_put(nf); 11271da177e4SLinus Torvalds out: 1128f394b62bSChuck Lever trace_nfsd_write_done(rqstp, fhp, offset, *cnt); 11291da177e4SLinus Torvalds return err; 11301da177e4SLinus Torvalds } 11311da177e4SLinus Torvalds 11323f965021SChuck Lever /** 11333f965021SChuck Lever * nfsd_commit - Commit pending writes to stable storage 11343f965021SChuck Lever * @rqstp: RPC request being processed 11353f965021SChuck Lever * @fhp: NFS filehandle 11363f965021SChuck Lever * @offset: raw offset from beginning of file 11373f965021SChuck Lever * @count: raw count of bytes to sync 11383f965021SChuck Lever * @verf: filled in with the server's current write verifier 1139aa696a6fSTrond Myklebust * 11403f965021SChuck Lever * Note: we guarantee that data that lies within the range specified 11413f965021SChuck Lever * by the 'offset' and 'count' parameters will be synced. The server 11423f965021SChuck Lever * is permitted to sync data that lies outside this range at the 11433f965021SChuck Lever * same time. 11441da177e4SLinus Torvalds * 11451da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 11461da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 11473f965021SChuck Lever * 11483f965021SChuck Lever * Return values: 11493f965021SChuck Lever * An nfsstat value in network byte order. 11501da177e4SLinus Torvalds */ 11516264d69dSAl Viro __be32 11523f965021SChuck Lever nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, u64 offset, 11533f965021SChuck Lever u32 count, __be32 *verf) 11541da177e4SLinus Torvalds { 11553f965021SChuck Lever u64 maxbytes; 11563f965021SChuck Lever loff_t start, end; 11572c445a0eSChuck Lever struct nfsd_net *nn; 11585920afa3SJeff Layton struct nfsd_file *nf; 11593f965021SChuck Lever __be32 err; 11601da177e4SLinus Torvalds 11615920afa3SJeff Layton err = nfsd_file_acquire(rqstp, fhp, 11625920afa3SJeff Layton NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &nf); 11638837abcaSMiklos Szeredi if (err) 1164aa696a6fSTrond Myklebust goto out; 11653f965021SChuck Lever 11663f965021SChuck Lever /* 11673f965021SChuck Lever * Convert the client-provided (offset, count) range to a 11683f965021SChuck Lever * (start, end) range. If the client-provided range falls 11693f965021SChuck Lever * outside the maximum file size of the underlying FS, 11703f965021SChuck Lever * clamp the sync range appropriately. 11713f965021SChuck Lever */ 11723f965021SChuck Lever start = 0; 11733f965021SChuck Lever end = LLONG_MAX; 11743f965021SChuck Lever maxbytes = (u64)fhp->fh_dentry->d_sb->s_maxbytes; 11753f965021SChuck Lever if (offset < maxbytes) { 11763f965021SChuck Lever start = offset; 11773f965021SChuck Lever if (count && (offset + count - 1 < maxbytes)) 11783f965021SChuck Lever end = offset + count - 1; 11793f965021SChuck Lever } 11803f965021SChuck Lever 11812c445a0eSChuck Lever nn = net_generic(nf->nf_net, nfsd_net_id); 11821da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 1183555dbf1aSTrond Myklebust errseq_t since = READ_ONCE(nf->nf_file->f_wb_err); 1184555dbf1aSTrond Myklebust int err2; 1185aa696a6fSTrond Myklebust 11863f965021SChuck Lever err2 = vfs_fsync_range(nf->nf_file, start, end, 0); 1187bbf2f098STrond Myklebust switch (err2) { 1188bbf2f098STrond Myklebust case 0: 11893988a578SChuck Lever nfsd_copy_write_verifier(verf, nn); 1190555dbf1aSTrond Myklebust err2 = filemap_check_wb_err(nf->nf_file->f_mapping, 1191555dbf1aSTrond Myklebust since); 11928a9ffb8cSAlexey Khoroshilov err = nfserrno(err2); 1193bbf2f098STrond Myklebust break; 1194bbf2f098STrond Myklebust case -EINVAL: 11951da177e4SLinus Torvalds err = nfserr_notsupp; 1196bbf2f098STrond Myklebust break; 1197bbf2f098STrond Myklebust default: 11983988a578SChuck Lever nfsd_reset_write_verifier(nn); 119975acacb6SChuck Lever trace_nfsd_writeverf_reset(nn, rqstp, err2); 1200555dbf1aSTrond Myklebust err = nfserrno(err2); 12018a9ffb8cSAlexey Khoroshilov } 1202524ff1afSTrond Myklebust } else 12033988a578SChuck Lever nfsd_copy_write_verifier(verf, nn); 12041da177e4SLinus Torvalds 12055920afa3SJeff Layton nfsd_file_put(nf); 1206aa696a6fSTrond Myklebust out: 12071da177e4SLinus Torvalds return err; 12081da177e4SLinus Torvalds } 12091da177e4SLinus Torvalds 12105f46e950SChuck Lever /** 12115f46e950SChuck Lever * nfsd_create_setattr - Set a created file's attributes 12125f46e950SChuck Lever * @rqstp: RPC transaction being executed 12135f46e950SChuck Lever * @fhp: NFS filehandle of parent directory 12145f46e950SChuck Lever * @resfhp: NFS filehandle of new object 12157fe2a71dSNeilBrown * @attrs: requested attributes of new object 12165f46e950SChuck Lever * 12175f46e950SChuck Lever * Returns nfs_ok on success, or an nfsstat in network byte order. 12185f46e950SChuck Lever */ 12195f46e950SChuck Lever __be32 12205f46e950SChuck Lever nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, 12217fe2a71dSNeilBrown struct svc_fh *resfhp, struct nfsd_attrs *attrs) 12225c002b3bSJ. Bruce Fields { 12237fe2a71dSNeilBrown struct iattr *iap = attrs->na_iattr; 12245f46e950SChuck Lever __be32 status; 12255f46e950SChuck Lever 12265c002b3bSJ. Bruce Fields /* 12275f46e950SChuck Lever * Mode has already been set by file creation. 12285c002b3bSJ. Bruce Fields */ 12295c002b3bSJ. Bruce Fields iap->ia_valid &= ~ATTR_MODE; 12305f46e950SChuck Lever 12315c002b3bSJ. Bruce Fields /* 12325c002b3bSJ. Bruce Fields * Setting uid/gid works only for root. Irix appears to 12335c002b3bSJ. Bruce Fields * send along the gid on create when it tries to implement 12345c002b3bSJ. Bruce Fields * setgid directories via NFS: 12355c002b3bSJ. Bruce Fields */ 12366fab8779SEric W. Biederman if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) 12375c002b3bSJ. Bruce Fields iap->ia_valid &= ~(ATTR_UID|ATTR_GID); 12385f46e950SChuck Lever 12395f46e950SChuck Lever /* 12405f46e950SChuck Lever * Callers expect new file metadata to be committed even 12415f46e950SChuck Lever * if the attributes have not changed. 12425f46e950SChuck Lever */ 12435c002b3bSJ. Bruce Fields if (iap->ia_valid) 12447fe2a71dSNeilBrown status = nfsd_setattr(rqstp, resfhp, attrs, 0, (time64_t)0); 12455f46e950SChuck Lever else 12465f46e950SChuck Lever status = nfserrno(commit_metadata(resfhp)); 12475f46e950SChuck Lever 12485f46e950SChuck Lever /* 12495f46e950SChuck Lever * Transactional filesystems had a chance to commit changes 12505f46e950SChuck Lever * for both parent and child simultaneously making the 12515f46e950SChuck Lever * following commit_metadata a noop in many cases. 12525f46e950SChuck Lever */ 12535f46e950SChuck Lever if (!status) 12545f46e950SChuck Lever status = nfserrno(commit_metadata(fhp)); 12555f46e950SChuck Lever 12565f46e950SChuck Lever /* 12575f46e950SChuck Lever * Update the new filehandle to pick up the new attributes. 12585f46e950SChuck Lever */ 12595f46e950SChuck Lever if (!status) 12605f46e950SChuck Lever status = fh_update(resfhp); 12615f46e950SChuck Lever 12625f46e950SChuck Lever return status; 12635c002b3bSJ. Bruce Fields } 12645c002b3bSJ. Bruce Fields 12654ac35c2fSwengang wang /* HPUX client sometimes creates a file in mode 000, and sets size to 0. 12664ac35c2fSwengang wang * setting size to 0 may fail for some specific file systems by the permission 12674ac35c2fSwengang wang * checking which requires WRITE permission but the mode is 000. 12684ac35c2fSwengang wang * we ignore the resizing(to 0) on the just new created file, since the size is 12694ac35c2fSwengang wang * 0 after file created. 12704ac35c2fSwengang wang * 12714ac35c2fSwengang wang * call this only after vfs_create() is called. 12724ac35c2fSwengang wang * */ 12734ac35c2fSwengang wang static void 12744ac35c2fSwengang wang nfsd_check_ignore_resizing(struct iattr *iap) 12754ac35c2fSwengang wang { 12764ac35c2fSwengang wang if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) 12774ac35c2fSwengang wang iap->ia_valid &= ~ATTR_SIZE; 12784ac35c2fSwengang wang } 12794ac35c2fSwengang wang 1280b44061d0SJ. Bruce Fields /* The parent directory should already be locked: */ 12816264d69dSAl Viro __be32 1282b44061d0SJ. Bruce Fields nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp, 12839558f930SNeilBrown struct nfsd_attrs *attrs, 12841da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 12851da177e4SLinus Torvalds { 12862b118859SDan Carpenter struct dentry *dentry, *dchild; 12871da177e4SLinus Torvalds struct inode *dirp; 12887fe2a71dSNeilBrown struct iattr *iap = attrs->na_iattr; 12896264d69dSAl Viro __be32 err; 12906264d69dSAl Viro int host_err; 12911da177e4SLinus Torvalds 12921da177e4SLinus Torvalds dentry = fhp->fh_dentry; 12932b0143b5SDavid Howells dirp = d_inode(dentry); 12941da177e4SLinus Torvalds 12951da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 12967eed34f1SOleg Drokin err = nfsd_permission(rqstp, fhp->fh_export, dentry, NFSD_MAY_CREATE); 12977eed34f1SOleg Drokin if (err) 12987eed34f1SOleg Drokin goto out; 12997eed34f1SOleg Drokin 13001da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 13011da177e4SLinus Torvalds iap->ia_mode = 0; 13021da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 13031da177e4SLinus Torvalds 130422cf8419SJ. Bruce Fields if (!IS_POSIXACL(dirp)) 130522cf8419SJ. Bruce Fields iap->ia_mode &= ~current_umask(); 130622cf8419SJ. Bruce Fields 1307088406bcSJ. Bruce Fields err = 0; 13084a55c101SJan Kara host_err = 0; 13091da177e4SLinus Torvalds switch (type) { 13101da177e4SLinus Torvalds case S_IFREG: 13116521f891SChristian Brauner host_err = vfs_create(&init_user_ns, dirp, dchild, iap->ia_mode, true); 13124ac35c2fSwengang wang if (!host_err) 13134ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 13141da177e4SLinus Torvalds break; 13151da177e4SLinus Torvalds case S_IFDIR: 13166521f891SChristian Brauner host_err = vfs_mkdir(&init_user_ns, dirp, dchild, iap->ia_mode); 13173819bb0dSAl Viro if (!host_err && unlikely(d_unhashed(dchild))) { 13183819bb0dSAl Viro struct dentry *d; 13193819bb0dSAl Viro d = lookup_one_len(dchild->d_name.name, 13203819bb0dSAl Viro dchild->d_parent, 13213819bb0dSAl Viro dchild->d_name.len); 13223819bb0dSAl Viro if (IS_ERR(d)) { 13233819bb0dSAl Viro host_err = PTR_ERR(d); 13243819bb0dSAl Viro break; 13253819bb0dSAl Viro } 13263819bb0dSAl Viro if (unlikely(d_is_negative(d))) { 13273819bb0dSAl Viro dput(d); 13283819bb0dSAl Viro err = nfserr_serverfault; 13293819bb0dSAl Viro goto out; 13303819bb0dSAl Viro } 13313819bb0dSAl Viro dput(resfhp->fh_dentry); 13323819bb0dSAl Viro resfhp->fh_dentry = dget(d); 13333819bb0dSAl Viro err = fh_update(resfhp); 13343819bb0dSAl Viro dput(dchild); 13353819bb0dSAl Viro dchild = d; 13363819bb0dSAl Viro if (err) 13373819bb0dSAl Viro goto out; 13383819bb0dSAl Viro } 13391da177e4SLinus Torvalds break; 13401da177e4SLinus Torvalds case S_IFCHR: 13411da177e4SLinus Torvalds case S_IFBLK: 13421da177e4SLinus Torvalds case S_IFIFO: 13431da177e4SLinus Torvalds case S_IFSOCK: 13446521f891SChristian Brauner host_err = vfs_mknod(&init_user_ns, dirp, dchild, 13456521f891SChristian Brauner iap->ia_mode, rdev); 13461da177e4SLinus Torvalds break; 134771423274SJ. Bruce Fields default: 134871423274SJ. Bruce Fields printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", 134971423274SJ. Bruce Fields type); 135071423274SJ. Bruce Fields host_err = -EINVAL; 1351463c3197SDave Hansen } 13524a55c101SJan Kara if (host_err < 0) 1353463c3197SDave Hansen goto out_nfserr; 13541da177e4SLinus Torvalds 13557fe2a71dSNeilBrown err = nfsd_create_setattr(rqstp, fhp, resfhp, attrs); 13561da177e4SLinus Torvalds 13571da177e4SLinus Torvalds out: 13581da177e4SLinus Torvalds dput(dchild); 13591da177e4SLinus Torvalds return err; 13601da177e4SLinus Torvalds 13611da177e4SLinus Torvalds out_nfserr: 13626264d69dSAl Viro err = nfserrno(host_err); 13631da177e4SLinus Torvalds goto out; 13641da177e4SLinus Torvalds } 13651da177e4SLinus Torvalds 1366b44061d0SJ. Bruce Fields /* 1367b44061d0SJ. Bruce Fields * Create a filesystem object (regular, directory, special). 1368b44061d0SJ. Bruce Fields * Note that the parent directory is left locked. 1369b44061d0SJ. Bruce Fields * 1370b44061d0SJ. Bruce Fields * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 1371b44061d0SJ. Bruce Fields */ 1372b44061d0SJ. Bruce Fields __be32 1373b44061d0SJ. Bruce Fields nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 13747fe2a71dSNeilBrown char *fname, int flen, struct nfsd_attrs *attrs, 1375b44061d0SJ. Bruce Fields int type, dev_t rdev, struct svc_fh *resfhp) 1376b44061d0SJ. Bruce Fields { 1377b44061d0SJ. Bruce Fields struct dentry *dentry, *dchild = NULL; 1378b44061d0SJ. Bruce Fields __be32 err; 1379b44061d0SJ. Bruce Fields int host_err; 1380b44061d0SJ. Bruce Fields 1381b44061d0SJ. Bruce Fields if (isdotent(fname, flen)) 1382b44061d0SJ. Bruce Fields return nfserr_exist; 1383b44061d0SJ. Bruce Fields 1384fa08139dSJ. Bruce Fields err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_NOP); 1385b44061d0SJ. Bruce Fields if (err) 1386b44061d0SJ. Bruce Fields return err; 1387b44061d0SJ. Bruce Fields 1388b44061d0SJ. Bruce Fields dentry = fhp->fh_dentry; 1389b44061d0SJ. Bruce Fields 1390b44061d0SJ. Bruce Fields host_err = fh_want_write(fhp); 1391b44061d0SJ. Bruce Fields if (host_err) 1392b44061d0SJ. Bruce Fields return nfserrno(host_err); 1393b44061d0SJ. Bruce Fields 1394debf16f0SNeilBrown inode_lock_nested(dentry->d_inode, I_MUTEX_PARENT); 1395b44061d0SJ. Bruce Fields dchild = lookup_one_len(fname, dentry, flen); 1396b44061d0SJ. Bruce Fields host_err = PTR_ERR(dchild); 1397927bfc56SNeilBrown if (IS_ERR(dchild)) { 1398927bfc56SNeilBrown err = nfserrno(host_err); 1399927bfc56SNeilBrown goto out_unlock; 1400927bfc56SNeilBrown } 1401b44061d0SJ. Bruce Fields err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 1402502aa0a5SJosef Bacik /* 1403502aa0a5SJosef Bacik * We unconditionally drop our ref to dchild as fh_compose will have 1404502aa0a5SJosef Bacik * already grabbed its own ref for it. 1405502aa0a5SJosef Bacik */ 1406b44061d0SJ. Bruce Fields dput(dchild); 1407502aa0a5SJosef Bacik if (err) 1408927bfc56SNeilBrown goto out_unlock; 1409debf16f0SNeilBrown fh_fill_pre_attrs(fhp); 14109558f930SNeilBrown err = nfsd_create_locked(rqstp, fhp, attrs, type, rdev, resfhp); 1411debf16f0SNeilBrown fh_fill_post_attrs(fhp); 1412927bfc56SNeilBrown out_unlock: 1413debf16f0SNeilBrown inode_unlock(dentry->d_inode); 1414927bfc56SNeilBrown return err; 1415b44061d0SJ. Bruce Fields } 1416b44061d0SJ. Bruce Fields 14171da177e4SLinus Torvalds /* 14181da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 14191da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 14201da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 14211da177e4SLinus Torvalds */ 14226264d69dSAl Viro __be32 14231da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 14241da177e4SLinus Torvalds { 14256264d69dSAl Viro __be32 err; 14264d7edbc3SAl Viro const char *link; 142768ac1234SAl Viro struct path path; 14284d7edbc3SAl Viro DEFINE_DELAYED_CALL(done); 14294d7edbc3SAl Viro int len; 14301da177e4SLinus Torvalds 14318837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); 14324d7edbc3SAl Viro if (unlikely(err)) 14334d7edbc3SAl Viro return err; 14341da177e4SLinus Torvalds 143568ac1234SAl Viro path.mnt = fhp->fh_export->ex_path.mnt; 143668ac1234SAl Viro path.dentry = fhp->fh_dentry; 14371da177e4SLinus Torvalds 14384d7edbc3SAl Viro if (unlikely(!d_is_symlink(path.dentry))) 14394d7edbc3SAl Viro return nfserr_inval; 14401da177e4SLinus Torvalds 144168ac1234SAl Viro touch_atime(&path); 14421da177e4SLinus Torvalds 14434d7edbc3SAl Viro link = vfs_get_link(path.dentry, &done); 14444d7edbc3SAl Viro if (IS_ERR(link)) 14454d7edbc3SAl Viro return nfserrno(PTR_ERR(link)); 14461da177e4SLinus Torvalds 14474d7edbc3SAl Viro len = strlen(link); 14484d7edbc3SAl Viro if (len < *lenp) 14494d7edbc3SAl Viro *lenp = len; 14504d7edbc3SAl Viro memcpy(buf, link, *lenp); 14514d7edbc3SAl Viro do_delayed_call(&done); 14524d7edbc3SAl Viro return 0; 14531da177e4SLinus Torvalds } 14541da177e4SLinus Torvalds 145593adc1e3SNeilBrown /** 145693adc1e3SNeilBrown * nfsd_symlink - Create a symlink and look up its inode 145793adc1e3SNeilBrown * @rqstp: RPC transaction being executed 145893adc1e3SNeilBrown * @fhp: NFS filehandle of parent directory 145993adc1e3SNeilBrown * @fname: filename of the new symlink 146093adc1e3SNeilBrown * @flen: length of @fname 146193adc1e3SNeilBrown * @path: content of the new symlink (NUL-terminated) 146293adc1e3SNeilBrown * @attrs: requested attributes of new object 146393adc1e3SNeilBrown * @resfhp: NFS filehandle of new object 146493adc1e3SNeilBrown * 14651da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 146693adc1e3SNeilBrown * 146793adc1e3SNeilBrown * Returns nfs_ok on success, or an nfsstat in network byte order. 14681da177e4SLinus Torvalds */ 14696264d69dSAl Viro __be32 14701da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 14711da177e4SLinus Torvalds char *fname, int flen, 147293adc1e3SNeilBrown char *path, struct nfsd_attrs *attrs, 14731e444f5bSKinglong Mee struct svc_fh *resfhp) 14741da177e4SLinus Torvalds { 14751da177e4SLinus Torvalds struct dentry *dentry, *dnew; 14766264d69dSAl Viro __be32 err, cerr; 14776264d69dSAl Viro int host_err; 14781da177e4SLinus Torvalds 14791da177e4SLinus Torvalds err = nfserr_noent; 148052ee0433SJ. Bruce Fields if (!flen || path[0] == '\0') 14811da177e4SLinus Torvalds goto out; 14821da177e4SLinus Torvalds err = nfserr_exist; 14831da177e4SLinus Torvalds if (isdotent(fname, flen)) 14841da177e4SLinus Torvalds goto out; 14851da177e4SLinus Torvalds 14868837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 14871da177e4SLinus Torvalds if (err) 14881da177e4SLinus Torvalds goto out; 14894a55c101SJan Kara 14904a55c101SJan Kara host_err = fh_want_write(fhp); 1491927bfc56SNeilBrown if (host_err) { 1492927bfc56SNeilBrown err = nfserrno(host_err); 1493927bfc56SNeilBrown goto out; 1494927bfc56SNeilBrown } 14954a55c101SJan Kara 14961da177e4SLinus Torvalds dentry = fhp->fh_dentry; 1497debf16f0SNeilBrown inode_lock_nested(dentry->d_inode, I_MUTEX_PARENT); 14981da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 1499927bfc56SNeilBrown if (IS_ERR(dnew)) { 1500927bfc56SNeilBrown err = nfserrno(PTR_ERR(dnew)); 1501debf16f0SNeilBrown inode_unlock(dentry->d_inode); 1502927bfc56SNeilBrown goto out_drop_write; 1503927bfc56SNeilBrown } 1504debf16f0SNeilBrown fh_fill_pre_attrs(fhp); 15056521f891SChristian Brauner host_err = vfs_symlink(&init_user_ns, d_inode(dentry), dnew, path); 15066264d69dSAl Viro err = nfserrno(host_err); 150793adc1e3SNeilBrown cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 150893adc1e3SNeilBrown if (!err) 150993adc1e3SNeilBrown nfsd_create_setattr(rqstp, fhp, resfhp, attrs); 1510debf16f0SNeilBrown fh_fill_post_attrs(fhp); 1511debf16f0SNeilBrown inode_unlock(dentry->d_inode); 1512f501912aSBen Myers if (!err) 1513f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 15141da177e4SLinus Torvalds dput(dnew); 15151da177e4SLinus Torvalds if (err==0) err = cerr; 1516927bfc56SNeilBrown out_drop_write: 1517927bfc56SNeilBrown fh_drop_write(fhp); 15181da177e4SLinus Torvalds out: 15191da177e4SLinus Torvalds return err; 15201da177e4SLinus Torvalds } 15211da177e4SLinus Torvalds 15221da177e4SLinus Torvalds /* 15231da177e4SLinus Torvalds * Create a hardlink 15241da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 15251da177e4SLinus Torvalds */ 15266264d69dSAl Viro __be32 15271da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 15281da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 15291da177e4SLinus Torvalds { 15301da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 153155b13354SJ. Bruce Fields struct inode *dirp; 15326264d69dSAl Viro __be32 err; 15336264d69dSAl Viro int host_err; 15341da177e4SLinus Torvalds 15358837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); 15361da177e4SLinus Torvalds if (err) 15371da177e4SLinus Torvalds goto out; 15387d818a7bSJ. Bruce Fields err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); 15391da177e4SLinus Torvalds if (err) 15401da177e4SLinus Torvalds goto out; 15417d818a7bSJ. Bruce Fields err = nfserr_isdir; 1542e36cb0b8SDavid Howells if (d_is_dir(tfhp->fh_dentry)) 15437d818a7bSJ. Bruce Fields goto out; 15441da177e4SLinus Torvalds err = nfserr_perm; 15451da177e4SLinus Torvalds if (!len) 15461da177e4SLinus Torvalds goto out; 15471da177e4SLinus Torvalds err = nfserr_exist; 15481da177e4SLinus Torvalds if (isdotent(name, len)) 15491da177e4SLinus Torvalds goto out; 15501da177e4SLinus Torvalds 15514a55c101SJan Kara host_err = fh_want_write(tfhp); 15524a55c101SJan Kara if (host_err) { 15534a55c101SJan Kara err = nfserrno(host_err); 15544a55c101SJan Kara goto out; 15554a55c101SJan Kara } 15564a55c101SJan Kara 15571da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 15582b0143b5SDavid Howells dirp = d_inode(ddir); 1559debf16f0SNeilBrown inode_lock_nested(dirp, I_MUTEX_PARENT); 15601da177e4SLinus Torvalds 15611da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 1562e18bcb33SNeilBrown if (IS_ERR(dnew)) { 1563e18bcb33SNeilBrown err = nfserrno(PTR_ERR(dnew)); 1564e18bcb33SNeilBrown goto out_unlock; 1565e18bcb33SNeilBrown } 15661da177e4SLinus Torvalds 15671da177e4SLinus Torvalds dold = tfhp->fh_dentry; 15681da177e4SLinus Torvalds 15694795bb37SJ. Bruce Fields err = nfserr_noent; 15702b0143b5SDavid Howells if (d_really_is_negative(dold)) 15714a55c101SJan Kara goto out_dput; 1572debf16f0SNeilBrown fh_fill_pre_attrs(ffhp); 15736521f891SChristian Brauner host_err = vfs_link(dold, &init_user_ns, dirp, dnew, NULL); 1574debf16f0SNeilBrown fh_fill_post_attrs(ffhp); 1575debf16f0SNeilBrown inode_unlock(dirp); 15766264d69dSAl Viro if (!host_err) { 1577f501912aSBen Myers err = nfserrno(commit_metadata(ffhp)); 1578f501912aSBen Myers if (!err) 1579f501912aSBen Myers err = nfserrno(commit_metadata(tfhp)); 15801da177e4SLinus Torvalds } else { 15816264d69dSAl Viro if (host_err == -EXDEV && rqstp->rq_vers == 2) 15821da177e4SLinus Torvalds err = nfserr_acces; 15831da177e4SLinus Torvalds else 15846264d69dSAl Viro err = nfserrno(host_err); 15851da177e4SLinus Torvalds } 15861da177e4SLinus Torvalds dput(dnew); 1587e18bcb33SNeilBrown out_drop_write: 15884a55c101SJan Kara fh_drop_write(tfhp); 15891da177e4SLinus Torvalds out: 15901da177e4SLinus Torvalds return err; 15911da177e4SLinus Torvalds 1592e18bcb33SNeilBrown out_dput: 1593e18bcb33SNeilBrown dput(dnew); 1594e18bcb33SNeilBrown out_unlock: 1595debf16f0SNeilBrown inode_unlock(dirp); 1596e18bcb33SNeilBrown goto out_drop_write; 15971da177e4SLinus Torvalds } 15981da177e4SLinus Torvalds 15997775ec57SJeff Layton static void 16007775ec57SJeff Layton nfsd_close_cached_files(struct dentry *dentry) 16017775ec57SJeff Layton { 16027775ec57SJeff Layton struct inode *inode = d_inode(dentry); 16037775ec57SJeff Layton 16047775ec57SJeff Layton if (inode && S_ISREG(inode->i_mode)) 16057775ec57SJeff Layton nfsd_file_close_inode_sync(inode); 16067775ec57SJeff Layton } 16077775ec57SJeff Layton 16087775ec57SJeff Layton static bool 16097775ec57SJeff Layton nfsd_has_cached_files(struct dentry *dentry) 16107775ec57SJeff Layton { 16117775ec57SJeff Layton bool ret = false; 16127775ec57SJeff Layton struct inode *inode = d_inode(dentry); 16137775ec57SJeff Layton 16147775ec57SJeff Layton if (inode && S_ISREG(inode->i_mode)) 16157775ec57SJeff Layton ret = nfsd_file_is_cached(inode); 16167775ec57SJeff Layton return ret; 16177775ec57SJeff Layton } 16187775ec57SJeff Layton 16191da177e4SLinus Torvalds /* 16201da177e4SLinus Torvalds * Rename a file 16211da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16221da177e4SLinus Torvalds */ 16236264d69dSAl Viro __be32 16241da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 16251da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 16261da177e4SLinus Torvalds { 16271da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 16281da177e4SLinus Torvalds struct inode *fdir, *tdir; 16296264d69dSAl Viro __be32 err; 16306264d69dSAl Viro int host_err; 16317f84b488SJeff Layton bool close_cached = false; 16321da177e4SLinus Torvalds 16338837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); 16341da177e4SLinus Torvalds if (err) 16351da177e4SLinus Torvalds goto out; 16368837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); 16371da177e4SLinus Torvalds if (err) 16381da177e4SLinus Torvalds goto out; 16391da177e4SLinus Torvalds 16401da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 16412b0143b5SDavid Howells fdir = d_inode(fdentry); 16421da177e4SLinus Torvalds 16431da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 16442b0143b5SDavid Howells tdir = d_inode(tdentry); 16451da177e4SLinus Torvalds 16461da177e4SLinus Torvalds err = nfserr_perm; 16471da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 16481da177e4SLinus Torvalds goto out; 16491da177e4SLinus Torvalds 16507775ec57SJeff Layton retry: 16514a55c101SJan Kara host_err = fh_want_write(ffhp); 16524a55c101SJan Kara if (host_err) { 16534a55c101SJan Kara err = nfserrno(host_err); 16544a55c101SJan Kara goto out; 16554a55c101SJan Kara } 16564a55c101SJan Kara 16571da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 1658fcb5e3faSChuck Lever fh_fill_pre_attrs(ffhp); 1659fcb5e3faSChuck Lever fh_fill_pre_attrs(tfhp); 16601da177e4SLinus Torvalds 16611da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 16626264d69dSAl Viro host_err = PTR_ERR(odentry); 16631da177e4SLinus Torvalds if (IS_ERR(odentry)) 16641da177e4SLinus Torvalds goto out_nfserr; 16651da177e4SLinus Torvalds 16666264d69dSAl Viro host_err = -ENOENT; 16672b0143b5SDavid Howells if (d_really_is_negative(odentry)) 16681da177e4SLinus Torvalds goto out_dput_old; 16696264d69dSAl Viro host_err = -EINVAL; 16701da177e4SLinus Torvalds if (odentry == trap) 16711da177e4SLinus Torvalds goto out_dput_old; 16721da177e4SLinus Torvalds 16731da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 16746264d69dSAl Viro host_err = PTR_ERR(ndentry); 16751da177e4SLinus Torvalds if (IS_ERR(ndentry)) 16761da177e4SLinus Torvalds goto out_dput_old; 16776264d69dSAl Viro host_err = -ENOTEMPTY; 16781da177e4SLinus Torvalds if (ndentry == trap) 16791da177e4SLinus Torvalds goto out_dput_new; 16801da177e4SLinus Torvalds 16819079b1ebSDave Hansen host_err = -EXDEV; 16829079b1ebSDave Hansen if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) 16839079b1ebSDave Hansen goto out_dput_new; 1684aa387d6cSJ. Bruce Fields if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry) 1685aa387d6cSJ. Bruce Fields goto out_dput_new; 16869079b1ebSDave Hansen 16877f84b488SJeff Layton if ((ndentry->d_sb->s_export_op->flags & EXPORT_OP_CLOSE_BEFORE_UNLINK) && 16887f84b488SJeff Layton nfsd_has_cached_files(ndentry)) { 16897f84b488SJeff Layton close_cached = true; 16907775ec57SJeff Layton goto out_dput_old; 16917775ec57SJeff Layton } else { 16929fe61450SChristian Brauner struct renamedata rd = { 16936521f891SChristian Brauner .old_mnt_userns = &init_user_ns, 16949fe61450SChristian Brauner .old_dir = fdir, 16959fe61450SChristian Brauner .old_dentry = odentry, 16966521f891SChristian Brauner .new_mnt_userns = &init_user_ns, 16979fe61450SChristian Brauner .new_dir = tdir, 16989fe61450SChristian Brauner .new_dentry = ndentry, 16999fe61450SChristian Brauner }; 170068c522afSChuck Lever int retries; 170168c522afSChuck Lever 170268c522afSChuck Lever for (retries = 1;;) { 17039fe61450SChristian Brauner host_err = vfs_rename(&rd); 170468c522afSChuck Lever if (host_err != -EAGAIN || !retries--) 170568c522afSChuck Lever break; 170668c522afSChuck Lever if (!nfsd_wait_for_delegreturn(rqstp, d_inode(odentry))) 170768c522afSChuck Lever break; 170868c522afSChuck Lever } 1709f501912aSBen Myers if (!host_err) { 1710f501912aSBen Myers host_err = commit_metadata(tfhp); 17116264d69dSAl Viro if (!host_err) 1712f501912aSBen Myers host_err = commit_metadata(ffhp); 17131da177e4SLinus Torvalds } 17147775ec57SJeff Layton } 17151da177e4SLinus Torvalds out_dput_new: 17161da177e4SLinus Torvalds dput(ndentry); 17171da177e4SLinus Torvalds out_dput_old: 17181da177e4SLinus Torvalds dput(odentry); 17191da177e4SLinus Torvalds out_nfserr: 17206264d69dSAl Viro err = nfserrno(host_err); 1721dd8dd403SNeilBrown 17227f84b488SJeff Layton if (!close_cached) { 1723fcb5e3faSChuck Lever fh_fill_post_attrs(ffhp); 1724fcb5e3faSChuck Lever fh_fill_post_attrs(tfhp); 17257775ec57SJeff Layton } 17261da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 17274a55c101SJan Kara fh_drop_write(ffhp); 17281da177e4SLinus Torvalds 17297775ec57SJeff Layton /* 17307775ec57SJeff Layton * If the target dentry has cached open files, then we need to try to 17317775ec57SJeff Layton * close them prior to doing the rename. Flushing delayed fput 17327775ec57SJeff Layton * shouldn't be done with locks held however, so we delay it until this 17337775ec57SJeff Layton * point and then reattempt the whole shebang. 17347775ec57SJeff Layton */ 17357f84b488SJeff Layton if (close_cached) { 17367f84b488SJeff Layton close_cached = false; 17377775ec57SJeff Layton nfsd_close_cached_files(ndentry); 17387775ec57SJeff Layton dput(ndentry); 17397775ec57SJeff Layton goto retry; 17407775ec57SJeff Layton } 17411da177e4SLinus Torvalds out: 17421da177e4SLinus Torvalds return err; 17431da177e4SLinus Torvalds } 17441da177e4SLinus Torvalds 17451da177e4SLinus Torvalds /* 17461da177e4SLinus Torvalds * Unlink a file or directory 17471da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 17481da177e4SLinus Torvalds */ 17496264d69dSAl Viro __be32 17501da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 17511da177e4SLinus Torvalds char *fname, int flen) 17521da177e4SLinus Torvalds { 17531da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 17541da177e4SLinus Torvalds struct inode *dirp; 1755e5d74a2dSYu Hsiang Huang struct inode *rinode; 17566264d69dSAl Viro __be32 err; 17576264d69dSAl Viro int host_err; 17581da177e4SLinus Torvalds 17591da177e4SLinus Torvalds err = nfserr_acces; 17601da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 17611da177e4SLinus Torvalds goto out; 17628837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); 17631da177e4SLinus Torvalds if (err) 17641da177e4SLinus Torvalds goto out; 17651da177e4SLinus Torvalds 17664a55c101SJan Kara host_err = fh_want_write(fhp); 17674a55c101SJan Kara if (host_err) 17684a55c101SJan Kara goto out_nfserr; 17694a55c101SJan Kara 17701da177e4SLinus Torvalds dentry = fhp->fh_dentry; 17712b0143b5SDavid Howells dirp = d_inode(dentry); 1772debf16f0SNeilBrown inode_lock_nested(dirp, I_MUTEX_PARENT); 17731da177e4SLinus Torvalds 17741da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 17756264d69dSAl Viro host_err = PTR_ERR(rdentry); 17761da177e4SLinus Torvalds if (IS_ERR(rdentry)) 1777b677c0c6SNeilBrown goto out_unlock; 17781da177e4SLinus Torvalds 17792b0143b5SDavid Howells if (d_really_is_negative(rdentry)) { 17801da177e4SLinus Torvalds dput(rdentry); 17810ca0c9d7SJ. Bruce Fields host_err = -ENOENT; 1782b677c0c6SNeilBrown goto out_unlock; 17831da177e4SLinus Torvalds } 1784e5d74a2dSYu Hsiang Huang rinode = d_inode(rdentry); 1785e5d74a2dSYu Hsiang Huang ihold(rinode); 17861da177e4SLinus Torvalds 17871da177e4SLinus Torvalds if (!type) 17882b0143b5SDavid Howells type = d_inode(rdentry)->i_mode & S_IFMT; 17891da177e4SLinus Torvalds 1790debf16f0SNeilBrown fh_fill_pre_attrs(fhp); 17917775ec57SJeff Layton if (type != S_IFDIR) { 17925f5f8b6dSChuck Lever int retries; 17935f5f8b6dSChuck Lever 17947f84b488SJeff Layton if (rdentry->d_sb->s_export_op->flags & EXPORT_OP_CLOSE_BEFORE_UNLINK) 17957775ec57SJeff Layton nfsd_close_cached_files(rdentry); 17965f5f8b6dSChuck Lever 17975f5f8b6dSChuck Lever for (retries = 1;;) { 17986521f891SChristian Brauner host_err = vfs_unlink(&init_user_ns, dirp, rdentry, NULL); 17995f5f8b6dSChuck Lever if (host_err != -EAGAIN || !retries--) 18005f5f8b6dSChuck Lever break; 18015f5f8b6dSChuck Lever if (!nfsd_wait_for_delegreturn(rqstp, rinode)) 18025f5f8b6dSChuck Lever break; 18035f5f8b6dSChuck Lever } 18047775ec57SJeff Layton } else { 18056521f891SChristian Brauner host_err = vfs_rmdir(&init_user_ns, dirp, rdentry); 18067775ec57SJeff Layton } 1807debf16f0SNeilBrown fh_fill_post_attrs(fhp); 18087775ec57SJeff Layton 1809debf16f0SNeilBrown inode_unlock(dirp); 1810541ce98cSJ. Bruce Fields if (!host_err) 1811541ce98cSJ. Bruce Fields host_err = commit_metadata(fhp); 18121da177e4SLinus Torvalds dput(rdentry); 1813e5d74a2dSYu Hsiang Huang iput(rinode); /* truncate the inode here */ 18141da177e4SLinus Torvalds 18150ca0c9d7SJ. Bruce Fields out_drop_write: 18160ca0c9d7SJ. Bruce Fields fh_drop_write(fhp); 18171da177e4SLinus Torvalds out_nfserr: 1818466e16f0SNeilBrown if (host_err == -EBUSY) { 1819466e16f0SNeilBrown /* name is mounted-on. There is no perfect 1820466e16f0SNeilBrown * error status. 1821466e16f0SNeilBrown */ 1822466e16f0SNeilBrown if (nfsd_v4client(rqstp)) 1823466e16f0SNeilBrown err = nfserr_file_open; 1824466e16f0SNeilBrown else 1825466e16f0SNeilBrown err = nfserr_acces; 1826466e16f0SNeilBrown } else { 18276264d69dSAl Viro err = nfserrno(host_err); 1828466e16f0SNeilBrown } 1829f193fbabSYAMAMOTO Takashi out: 1830f193fbabSYAMAMOTO Takashi return err; 1831b677c0c6SNeilBrown out_unlock: 1832debf16f0SNeilBrown inode_unlock(dirp); 1833b677c0c6SNeilBrown goto out_drop_write; 18341da177e4SLinus Torvalds } 18351da177e4SLinus Torvalds 18361da177e4SLinus Torvalds /* 183714f7dd63SDavid Woodhouse * We do this buffering because we must not call back into the file 183814f7dd63SDavid Woodhouse * system's ->lookup() method from the filldir callback. That may well 183914f7dd63SDavid Woodhouse * deadlock a number of file systems. 184014f7dd63SDavid Woodhouse * 184114f7dd63SDavid Woodhouse * This is based heavily on the implementation of same in XFS. 184214f7dd63SDavid Woodhouse */ 184314f7dd63SDavid Woodhouse struct buffered_dirent { 184414f7dd63SDavid Woodhouse u64 ino; 184514f7dd63SDavid Woodhouse loff_t offset; 184614f7dd63SDavid Woodhouse int namlen; 184714f7dd63SDavid Woodhouse unsigned int d_type; 184814f7dd63SDavid Woodhouse char name[]; 184914f7dd63SDavid Woodhouse }; 185014f7dd63SDavid Woodhouse 185114f7dd63SDavid Woodhouse struct readdir_data { 18525c0ba4e0SAl Viro struct dir_context ctx; 185314f7dd63SDavid Woodhouse char *dirent; 185414f7dd63SDavid Woodhouse size_t used; 185553c9c5c0SAl Viro int full; 185614f7dd63SDavid Woodhouse }; 185714f7dd63SDavid Woodhouse 1858ac7576f4SMiklos Szeredi static int nfsd_buffered_filldir(struct dir_context *ctx, const char *name, 1859ac7576f4SMiklos Szeredi int namlen, loff_t offset, u64 ino, 1860ac7576f4SMiklos Szeredi unsigned int d_type) 186114f7dd63SDavid Woodhouse { 1862ac7576f4SMiklos Szeredi struct readdir_data *buf = 1863ac7576f4SMiklos Szeredi container_of(ctx, struct readdir_data, ctx); 186414f7dd63SDavid Woodhouse struct buffered_dirent *de = (void *)(buf->dirent + buf->used); 186514f7dd63SDavid Woodhouse unsigned int reclen; 186614f7dd63SDavid Woodhouse 186714f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); 186853c9c5c0SAl Viro if (buf->used + reclen > PAGE_SIZE) { 186953c9c5c0SAl Viro buf->full = 1; 187014f7dd63SDavid Woodhouse return -EINVAL; 187153c9c5c0SAl Viro } 187214f7dd63SDavid Woodhouse 187314f7dd63SDavid Woodhouse de->namlen = namlen; 187414f7dd63SDavid Woodhouse de->offset = offset; 187514f7dd63SDavid Woodhouse de->ino = ino; 187614f7dd63SDavid Woodhouse de->d_type = d_type; 187714f7dd63SDavid Woodhouse memcpy(de->name, name, namlen); 187814f7dd63SDavid Woodhouse buf->used += reclen; 187914f7dd63SDavid Woodhouse 188014f7dd63SDavid Woodhouse return 0; 188114f7dd63SDavid Woodhouse } 188214f7dd63SDavid Woodhouse 18836019ce07SChuck Lever static __be32 nfsd_buffered_readdir(struct file *file, struct svc_fh *fhp, 18846019ce07SChuck Lever nfsd_filldir_t func, struct readdir_cd *cdp, 18856019ce07SChuck Lever loff_t *offsetp) 18862628b766SDavid Woodhouse { 188714f7dd63SDavid Woodhouse struct buffered_dirent *de; 18882628b766SDavid Woodhouse int host_err; 188914f7dd63SDavid Woodhouse int size; 189014f7dd63SDavid Woodhouse loff_t offset; 1891ac6614b7SAl Viro struct readdir_data buf = { 1892ac6614b7SAl Viro .ctx.actor = nfsd_buffered_filldir, 1893ac6614b7SAl Viro .dirent = (void *)__get_free_page(GFP_KERNEL) 1894ac6614b7SAl Viro }; 18952628b766SDavid Woodhouse 189614f7dd63SDavid Woodhouse if (!buf.dirent) 18972f9092e1SDavid Woodhouse return nfserrno(-ENOMEM); 189814f7dd63SDavid Woodhouse 189914f7dd63SDavid Woodhouse offset = *offsetp; 19002628b766SDavid Woodhouse 190114f7dd63SDavid Woodhouse while (1) { 190214f7dd63SDavid Woodhouse unsigned int reclen; 190314f7dd63SDavid Woodhouse 1904b726e923SDoug Nazar cdp->err = nfserr_eof; /* will be cleared on successful read */ 190514f7dd63SDavid Woodhouse buf.used = 0; 190653c9c5c0SAl Viro buf.full = 0; 190714f7dd63SDavid Woodhouse 19085c0ba4e0SAl Viro host_err = iterate_dir(file, &buf.ctx); 190953c9c5c0SAl Viro if (buf.full) 191053c9c5c0SAl Viro host_err = 0; 191153c9c5c0SAl Viro 191253c9c5c0SAl Viro if (host_err < 0) 191314f7dd63SDavid Woodhouse break; 191414f7dd63SDavid Woodhouse 191514f7dd63SDavid Woodhouse size = buf.used; 191614f7dd63SDavid Woodhouse 191714f7dd63SDavid Woodhouse if (!size) 191814f7dd63SDavid Woodhouse break; 191914f7dd63SDavid Woodhouse 192014f7dd63SDavid Woodhouse de = (struct buffered_dirent *)buf.dirent; 192114f7dd63SDavid Woodhouse while (size > 0) { 192214f7dd63SDavid Woodhouse offset = de->offset; 192314f7dd63SDavid Woodhouse 192414f7dd63SDavid Woodhouse if (func(cdp, de->name, de->namlen, de->offset, 192514f7dd63SDavid Woodhouse de->ino, de->d_type)) 19262f9092e1SDavid Woodhouse break; 192714f7dd63SDavid Woodhouse 192814f7dd63SDavid Woodhouse if (cdp->err != nfs_ok) 19292f9092e1SDavid Woodhouse break; 193014f7dd63SDavid Woodhouse 19316019ce07SChuck Lever trace_nfsd_dirent(fhp, de->ino, de->name, de->namlen); 19326019ce07SChuck Lever 193314f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(*de) + de->namlen, 193414f7dd63SDavid Woodhouse sizeof(u64)); 193514f7dd63SDavid Woodhouse size -= reclen; 193614f7dd63SDavid Woodhouse de = (struct buffered_dirent *)((char *)de + reclen); 193714f7dd63SDavid Woodhouse } 19382f9092e1SDavid Woodhouse if (size > 0) /* We bailed out early */ 19392f9092e1SDavid Woodhouse break; 19402f9092e1SDavid Woodhouse 1941c002a6c7SDavid Woodhouse offset = vfs_llseek(file, 0, SEEK_CUR); 194214f7dd63SDavid Woodhouse } 194314f7dd63SDavid Woodhouse 194414f7dd63SDavid Woodhouse free_page((unsigned long)(buf.dirent)); 19452628b766SDavid Woodhouse 19462628b766SDavid Woodhouse if (host_err) 19472628b766SDavid Woodhouse return nfserrno(host_err); 194814f7dd63SDavid Woodhouse 194914f7dd63SDavid Woodhouse *offsetp = offset; 19502628b766SDavid Woodhouse return cdp->err; 19512628b766SDavid Woodhouse } 19522628b766SDavid Woodhouse 19531da177e4SLinus Torvalds /* 19541da177e4SLinus Torvalds * Read entries from a directory. 19551da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 19561da177e4SLinus Torvalds */ 19576264d69dSAl Viro __be32 19581da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 1959ac7576f4SMiklos Szeredi struct readdir_cd *cdp, nfsd_filldir_t func) 19601da177e4SLinus Torvalds { 19616264d69dSAl Viro __be32 err; 19621da177e4SLinus Torvalds struct file *file; 19631da177e4SLinus Torvalds loff_t offset = *offsetp; 196406effdbbSBernd Schubert int may_flags = NFSD_MAY_READ; 19651da177e4SLinus Torvalds 196606effdbbSBernd Schubert /* NFSv2 only supports 32 bit cookies */ 196706effdbbSBernd Schubert if (rqstp->rq_vers > 2) 196806effdbbSBernd Schubert may_flags |= NFSD_MAY_64BIT_COOKIE; 196906effdbbSBernd Schubert 197006effdbbSBernd Schubert err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file); 19711da177e4SLinus Torvalds if (err) 19721da177e4SLinus Torvalds goto out; 19731da177e4SLinus Torvalds 1974b108fe6bSJeff Layton offset = vfs_llseek(file, offset, SEEK_SET); 19751da177e4SLinus Torvalds if (offset < 0) { 19761da177e4SLinus Torvalds err = nfserrno((int)offset); 19771da177e4SLinus Torvalds goto out_close; 19781da177e4SLinus Torvalds } 19791da177e4SLinus Torvalds 19806019ce07SChuck Lever err = nfsd_buffered_readdir(file, fhp, func, cdp, offsetp); 19811da177e4SLinus Torvalds 19821da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 19831da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 19841da177e4SLinus Torvalds out_close: 1985fd891454SChristoph Hellwig fput(file); 19861da177e4SLinus Torvalds out: 19871da177e4SLinus Torvalds return err; 19881da177e4SLinus Torvalds } 19891da177e4SLinus Torvalds 19901da177e4SLinus Torvalds /* 19911da177e4SLinus Torvalds * Get file system stats 19921da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 19931da177e4SLinus Torvalds */ 19946264d69dSAl Viro __be32 199504716e66SJ. Bruce Fields nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) 19961da177e4SLinus Torvalds { 1997f6360efbSTakashi Iwai __be32 err; 1998f6360efbSTakashi Iwai 1999f6360efbSTakashi Iwai err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); 2000f6360efbSTakashi Iwai if (!err) { 2001ebabe9a9SChristoph Hellwig struct path path = { 2002ebabe9a9SChristoph Hellwig .mnt = fhp->fh_export->ex_path.mnt, 2003ebabe9a9SChristoph Hellwig .dentry = fhp->fh_dentry, 2004ebabe9a9SChristoph Hellwig }; 2005f6360efbSTakashi Iwai if (vfs_statfs(&path, stat)) 20061da177e4SLinus Torvalds err = nfserr_io; 2007f6360efbSTakashi Iwai } 20081da177e4SLinus Torvalds return err; 20091da177e4SLinus Torvalds } 20101da177e4SLinus Torvalds 2011c7d51402SJ. Bruce Fields static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) 2012e22841c6SJ. Bruce Fields { 2013c7d51402SJ. Bruce Fields return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; 2014e22841c6SJ. Bruce Fields } 2015e22841c6SJ. Bruce Fields 201632119446SFrank van der Linden #ifdef CONFIG_NFSD_V4 201732119446SFrank van der Linden /* 201832119446SFrank van der Linden * Helper function to translate error numbers. In the case of xattr operations, 201932119446SFrank van der Linden * some error codes need to be translated outside of the standard translations. 202032119446SFrank van der Linden * 202132119446SFrank van der Linden * ENODATA needs to be translated to nfserr_noxattr. 202232119446SFrank van der Linden * E2BIG to nfserr_xattr2big. 202332119446SFrank van der Linden * 202432119446SFrank van der Linden * Additionally, vfs_listxattr can return -ERANGE. This means that the 202532119446SFrank van der Linden * file has too many extended attributes to retrieve inside an 202632119446SFrank van der Linden * XATTR_LIST_MAX sized buffer. This is a bug in the xattr implementation: 202732119446SFrank van der Linden * filesystems will allow the adding of extended attributes until they hit 202832119446SFrank van der Linden * their own internal limit. This limit may be larger than XATTR_LIST_MAX. 202932119446SFrank van der Linden * So, at that point, the attributes are present and valid, but can't 203032119446SFrank van der Linden * be retrieved using listxattr, since the upper level xattr code enforces 203132119446SFrank van der Linden * the XATTR_LIST_MAX limit. 203232119446SFrank van der Linden * 203332119446SFrank van der Linden * This bug means that we need to deal with listxattr returning -ERANGE. The 203432119446SFrank van der Linden * best mapping is to return TOOSMALL. 203532119446SFrank van der Linden */ 203632119446SFrank van der Linden static __be32 203732119446SFrank van der Linden nfsd_xattr_errno(int err) 203832119446SFrank van der Linden { 203932119446SFrank van der Linden switch (err) { 204032119446SFrank van der Linden case -ENODATA: 204132119446SFrank van der Linden return nfserr_noxattr; 204232119446SFrank van der Linden case -E2BIG: 204332119446SFrank van der Linden return nfserr_xattr2big; 204432119446SFrank van der Linden case -ERANGE: 204532119446SFrank van der Linden return nfserr_toosmall; 204632119446SFrank van der Linden } 204732119446SFrank van der Linden return nfserrno(err); 204832119446SFrank van der Linden } 204932119446SFrank van der Linden 205032119446SFrank van der Linden /* 205132119446SFrank van der Linden * Retrieve the specified user extended attribute. To avoid always 205232119446SFrank van der Linden * having to allocate the maximum size (since we are not getting 205332119446SFrank van der Linden * a maximum size from the RPC), do a probe + alloc. Hold a reader 205432119446SFrank van der Linden * lock on i_rwsem to prevent the extended attribute from changing 205532119446SFrank van der Linden * size while we're doing this. 205632119446SFrank van der Linden */ 205732119446SFrank van der Linden __be32 205832119446SFrank van der Linden nfsd_getxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name, 205932119446SFrank van der Linden void **bufp, int *lenp) 206032119446SFrank van der Linden { 206132119446SFrank van der Linden ssize_t len; 206232119446SFrank van der Linden __be32 err; 206332119446SFrank van der Linden char *buf; 206432119446SFrank van der Linden struct inode *inode; 206532119446SFrank van der Linden struct dentry *dentry; 206632119446SFrank van der Linden 206732119446SFrank van der Linden err = fh_verify(rqstp, fhp, 0, NFSD_MAY_READ); 206832119446SFrank van der Linden if (err) 206932119446SFrank van der Linden return err; 207032119446SFrank van der Linden 207132119446SFrank van der Linden err = nfs_ok; 207232119446SFrank van der Linden dentry = fhp->fh_dentry; 207332119446SFrank van der Linden inode = d_inode(dentry); 207432119446SFrank van der Linden 207532119446SFrank van der Linden inode_lock_shared(inode); 207632119446SFrank van der Linden 2077c7c7a1a1STycho Andersen len = vfs_getxattr(&init_user_ns, dentry, name, NULL, 0); 207832119446SFrank van der Linden 207932119446SFrank van der Linden /* 208032119446SFrank van der Linden * Zero-length attribute, just return. 208132119446SFrank van der Linden */ 208232119446SFrank van der Linden if (len == 0) { 208332119446SFrank van der Linden *bufp = NULL; 208432119446SFrank van der Linden *lenp = 0; 208532119446SFrank van der Linden goto out; 208632119446SFrank van der Linden } 208732119446SFrank van der Linden 208832119446SFrank van der Linden if (len < 0) { 208932119446SFrank van der Linden err = nfsd_xattr_errno(len); 209032119446SFrank van der Linden goto out; 209132119446SFrank van der Linden } 209232119446SFrank van der Linden 209332119446SFrank van der Linden if (len > *lenp) { 209432119446SFrank van der Linden err = nfserr_toosmall; 209532119446SFrank van der Linden goto out; 209632119446SFrank van der Linden } 209732119446SFrank van der Linden 209832119446SFrank van der Linden buf = kvmalloc(len, GFP_KERNEL | GFP_NOFS); 209932119446SFrank van der Linden if (buf == NULL) { 210032119446SFrank van der Linden err = nfserr_jukebox; 210132119446SFrank van der Linden goto out; 210232119446SFrank van der Linden } 210332119446SFrank van der Linden 2104c7c7a1a1STycho Andersen len = vfs_getxattr(&init_user_ns, dentry, name, buf, len); 210532119446SFrank van der Linden if (len <= 0) { 210632119446SFrank van der Linden kvfree(buf); 210732119446SFrank van der Linden buf = NULL; 210832119446SFrank van der Linden err = nfsd_xattr_errno(len); 210932119446SFrank van der Linden } 211032119446SFrank van der Linden 211132119446SFrank van der Linden *lenp = len; 211232119446SFrank van der Linden *bufp = buf; 211332119446SFrank van der Linden 211432119446SFrank van der Linden out: 211532119446SFrank van der Linden inode_unlock_shared(inode); 211632119446SFrank van der Linden 211732119446SFrank van der Linden return err; 211832119446SFrank van der Linden } 211932119446SFrank van der Linden 212032119446SFrank van der Linden /* 212132119446SFrank van der Linden * Retrieve the xattr names. Since we can't know how many are 212232119446SFrank van der Linden * user extended attributes, we must get all attributes here, 212332119446SFrank van der Linden * and have the XDR encode filter out the "user." ones. 212432119446SFrank van der Linden * 212532119446SFrank van der Linden * While this could always just allocate an XATTR_LIST_MAX 212632119446SFrank van der Linden * buffer, that's a waste, so do a probe + allocate. To 212732119446SFrank van der Linden * avoid any changes between the probe and allocate, wrap 212832119446SFrank van der Linden * this in inode_lock. 212932119446SFrank van der Linden */ 213032119446SFrank van der Linden __be32 213132119446SFrank van der Linden nfsd_listxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char **bufp, 213232119446SFrank van der Linden int *lenp) 213332119446SFrank van der Linden { 213432119446SFrank van der Linden ssize_t len; 213532119446SFrank van der Linden __be32 err; 213632119446SFrank van der Linden char *buf; 213732119446SFrank van der Linden struct inode *inode; 213832119446SFrank van der Linden struct dentry *dentry; 213932119446SFrank van der Linden 214032119446SFrank van der Linden err = fh_verify(rqstp, fhp, 0, NFSD_MAY_READ); 214132119446SFrank van der Linden if (err) 214232119446SFrank van der Linden return err; 214332119446SFrank van der Linden 214432119446SFrank van der Linden dentry = fhp->fh_dentry; 214532119446SFrank van der Linden inode = d_inode(dentry); 214632119446SFrank van der Linden *lenp = 0; 214732119446SFrank van der Linden 214832119446SFrank van der Linden inode_lock_shared(inode); 214932119446SFrank van der Linden 215032119446SFrank van der Linden len = vfs_listxattr(dentry, NULL, 0); 215132119446SFrank van der Linden if (len <= 0) { 215232119446SFrank van der Linden err = nfsd_xattr_errno(len); 215332119446SFrank van der Linden goto out; 215432119446SFrank van der Linden } 215532119446SFrank van der Linden 215632119446SFrank van der Linden if (len > XATTR_LIST_MAX) { 215732119446SFrank van der Linden err = nfserr_xattr2big; 215832119446SFrank van der Linden goto out; 215932119446SFrank van der Linden } 216032119446SFrank van der Linden 216132119446SFrank van der Linden /* 216232119446SFrank van der Linden * We're holding i_rwsem - use GFP_NOFS. 216332119446SFrank van der Linden */ 216432119446SFrank van der Linden buf = kvmalloc(len, GFP_KERNEL | GFP_NOFS); 216532119446SFrank van der Linden if (buf == NULL) { 216632119446SFrank van der Linden err = nfserr_jukebox; 216732119446SFrank van der Linden goto out; 216832119446SFrank van der Linden } 216932119446SFrank van der Linden 217032119446SFrank van der Linden len = vfs_listxattr(dentry, buf, len); 217132119446SFrank van der Linden if (len <= 0) { 217232119446SFrank van der Linden kvfree(buf); 217332119446SFrank van der Linden err = nfsd_xattr_errno(len); 217432119446SFrank van der Linden goto out; 217532119446SFrank van der Linden } 217632119446SFrank van der Linden 217732119446SFrank van der Linden *lenp = len; 217832119446SFrank van der Linden *bufp = buf; 217932119446SFrank van der Linden 218032119446SFrank van der Linden err = nfs_ok; 218132119446SFrank van der Linden out: 218232119446SFrank van der Linden inode_unlock_shared(inode); 218332119446SFrank van der Linden 218432119446SFrank van der Linden return err; 218532119446SFrank van der Linden } 218632119446SFrank van der Linden 2187bb4d53d6SNeilBrown /** 2188bb4d53d6SNeilBrown * nfsd_removexattr - Remove an extended attribute 2189bb4d53d6SNeilBrown * @rqstp: RPC transaction being executed 2190bb4d53d6SNeilBrown * @fhp: NFS filehandle of object with xattr to remove 2191bb4d53d6SNeilBrown * @name: name of xattr to remove (NUL-terminate) 2192bb4d53d6SNeilBrown * 2193bb4d53d6SNeilBrown * Pass in a NULL pointer for delegated_inode, and let the client deal 2194bb4d53d6SNeilBrown * with NFS4ERR_DELAY (same as with e.g. setattr and remove). 2195bb4d53d6SNeilBrown * 2196bb4d53d6SNeilBrown * Returns nfs_ok on success, or an nfsstat in network byte order. 219732119446SFrank van der Linden */ 219832119446SFrank van der Linden __be32 219932119446SFrank van der Linden nfsd_removexattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name) 220032119446SFrank van der Linden { 22018237284aSChuck Lever __be32 err; 22028237284aSChuck Lever int ret; 220332119446SFrank van der Linden 220432119446SFrank van der Linden err = fh_verify(rqstp, fhp, 0, NFSD_MAY_WRITE); 220532119446SFrank van der Linden if (err) 220632119446SFrank van der Linden return err; 220732119446SFrank van der Linden 220832119446SFrank van der Linden ret = fh_want_write(fhp); 220932119446SFrank van der Linden if (ret) 221032119446SFrank van der Linden return nfserrno(ret); 221132119446SFrank van der Linden 2212bb4d53d6SNeilBrown inode_lock(fhp->fh_dentry->d_inode); 2213bb4d53d6SNeilBrown fh_fill_pre_attrs(fhp); 221432119446SFrank van der Linden 2215c7c7a1a1STycho Andersen ret = __vfs_removexattr_locked(&init_user_ns, fhp->fh_dentry, 2216c7c7a1a1STycho Andersen name, NULL); 221732119446SFrank van der Linden 2218bb4d53d6SNeilBrown fh_fill_post_attrs(fhp); 2219bb4d53d6SNeilBrown inode_unlock(fhp->fh_dentry->d_inode); 222032119446SFrank van der Linden fh_drop_write(fhp); 222132119446SFrank van der Linden 222232119446SFrank van der Linden return nfsd_xattr_errno(ret); 222332119446SFrank van der Linden } 222432119446SFrank van der Linden 222532119446SFrank van der Linden __be32 222632119446SFrank van der Linden nfsd_setxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name, 222732119446SFrank van der Linden void *buf, u32 len, u32 flags) 222832119446SFrank van der Linden { 22298237284aSChuck Lever __be32 err; 22308237284aSChuck Lever int ret; 223132119446SFrank van der Linden 223232119446SFrank van der Linden err = fh_verify(rqstp, fhp, 0, NFSD_MAY_WRITE); 223332119446SFrank van der Linden if (err) 223432119446SFrank van der Linden return err; 223532119446SFrank van der Linden 223632119446SFrank van der Linden ret = fh_want_write(fhp); 223732119446SFrank van der Linden if (ret) 223832119446SFrank van der Linden return nfserrno(ret); 2239bb4d53d6SNeilBrown inode_lock(fhp->fh_dentry->d_inode); 2240bb4d53d6SNeilBrown fh_fill_pre_attrs(fhp); 224132119446SFrank van der Linden 2242c7c7a1a1STycho Andersen ret = __vfs_setxattr_locked(&init_user_ns, fhp->fh_dentry, name, buf, 2243c7c7a1a1STycho Andersen len, flags, NULL); 2244bb4d53d6SNeilBrown fh_fill_post_attrs(fhp); 2245bb4d53d6SNeilBrown inode_unlock(fhp->fh_dentry->d_inode); 224632119446SFrank van der Linden fh_drop_write(fhp); 224732119446SFrank van der Linden 224832119446SFrank van der Linden return nfsd_xattr_errno(ret); 224932119446SFrank van der Linden } 225032119446SFrank van der Linden #endif 225132119446SFrank van der Linden 22521da177e4SLinus Torvalds /* 22531da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 22541da177e4SLinus Torvalds */ 22556264d69dSAl Viro __be32 22560ec757dfSJ. Bruce Fields nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, 22570ec757dfSJ. Bruce Fields struct dentry *dentry, int acc) 22581da177e4SLinus Torvalds { 22592b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 22601da177e4SLinus Torvalds int err; 22611da177e4SLinus Torvalds 2262aea93397SJ. Bruce Fields if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) 22631da177e4SLinus Torvalds return 0; 22641da177e4SLinus Torvalds #if 0 22651da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 22661da177e4SLinus Torvalds acc, 22678837abcaSMiklos Szeredi (acc & NFSD_MAY_READ)? " read" : "", 22688837abcaSMiklos Szeredi (acc & NFSD_MAY_WRITE)? " write" : "", 22698837abcaSMiklos Szeredi (acc & NFSD_MAY_EXEC)? " exec" : "", 22708837abcaSMiklos Szeredi (acc & NFSD_MAY_SATTR)? " sattr" : "", 22718837abcaSMiklos Szeredi (acc & NFSD_MAY_TRUNC)? " trunc" : "", 22728837abcaSMiklos Szeredi (acc & NFSD_MAY_LOCK)? " lock" : "", 22738837abcaSMiklos Szeredi (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", 22741da177e4SLinus Torvalds inode->i_mode, 22751da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 22761da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 22772c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); 22781da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 22795cc0a840SDavid Howells inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); 22801da177e4SLinus Torvalds #endif 22811da177e4SLinus Torvalds 22821da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 22831da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 22841da177e4SLinus Torvalds * device special file, we ignore rofs. 22851da177e4SLinus Torvalds */ 22868837abcaSMiklos Szeredi if (!(acc & NFSD_MAY_LOCAL_ACCESS)) 22878837abcaSMiklos Szeredi if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { 22882c463e95SDave Hansen if (exp_rdonly(rqstp, exp) || 22892c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)) 22901da177e4SLinus Torvalds return nfserr_rofs; 22918837abcaSMiklos Szeredi if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) 22921da177e4SLinus Torvalds return nfserr_perm; 22931da177e4SLinus Torvalds } 22948837abcaSMiklos Szeredi if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) 22951da177e4SLinus Torvalds return nfserr_perm; 22961da177e4SLinus Torvalds 22978837abcaSMiklos Szeredi if (acc & NFSD_MAY_LOCK) { 22981da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 22991da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 23001da177e4SLinus Torvalds * ownership 23011da177e4SLinus Torvalds */ 23021da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 23031da177e4SLinus Torvalds return 0; 23041da177e4SLinus Torvalds else 23058837abcaSMiklos Szeredi acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; 23061da177e4SLinus Torvalds } 23071da177e4SLinus Torvalds /* 23081da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 23091da177e4SLinus Torvalds * would normally be checked at open time. This is to make 23101da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 23111da177e4SLinus Torvalds * 23121da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 23131da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 23141da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 23151da177e4SLinus Torvalds * always implies file truncation. 23161da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 23171da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 23181da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 23191da177e4SLinus Torvalds * with NFSv3. 23201da177e4SLinus Torvalds */ 23218837abcaSMiklos Szeredi if ((acc & NFSD_MAY_OWNER_OVERRIDE) && 23226fab8779SEric W. Biederman uid_eq(inode->i_uid, current_fsuid())) 23231da177e4SLinus Torvalds return 0; 23241da177e4SLinus Torvalds 23258837abcaSMiklos Szeredi /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ 232647291baaSChristian Brauner err = inode_permission(&init_user_ns, inode, 232747291baaSChristian Brauner acc & (MAY_READ | MAY_WRITE | MAY_EXEC)); 23281da177e4SLinus Torvalds 23291da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 23301da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 2331a043226bSJ. Bruce Fields (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || 2332a043226bSJ. Bruce Fields acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) 233347291baaSChristian Brauner err = inode_permission(&init_user_ns, inode, MAY_EXEC); 23341da177e4SLinus Torvalds 23351da177e4SLinus Torvalds return err? nfserrno(err) : 0; 23361da177e4SLinus Torvalds } 2337