11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * File operations used by nfsd. Some of these have been ripped from 31da177e4SLinus Torvalds * other parts of the kernel because they weren't exported, others 41da177e4SLinus Torvalds * are partial duplicates with added or changed functionality. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Note that several functions dget() the dentry upon which they want 71da177e4SLinus Torvalds * to act, most notably those that create directory entries. Response 81da177e4SLinus Torvalds * dentry's are dput()'d if necessary in the release callback. 91da177e4SLinus Torvalds * So if you notice code paths that apparently fail to dput() the 101da177e4SLinus Torvalds * dentry, don't worry--they have been taken care of. 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> 131da177e4SLinus Torvalds * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> 141da177e4SLinus Torvalds */ 151da177e4SLinus Torvalds 161da177e4SLinus Torvalds #include <linux/fs.h> 171da177e4SLinus Torvalds #include <linux/file.h> 18d6b29d7cSJens Axboe #include <linux/splice.h> 1995d871f0SAnna Schumaker #include <linux/falloc.h> 201da177e4SLinus Torvalds #include <linux/fcntl.h> 211da177e4SLinus Torvalds #include <linux/namei.h> 221da177e4SLinus Torvalds #include <linux/delay.h> 230eeca283SRobert Love #include <linux/fsnotify.h> 241da177e4SLinus Torvalds #include <linux/posix_acl_xattr.h> 251da177e4SLinus Torvalds #include <linux/xattr.h> 269a74af21SBoaz Harrosh #include <linux/jhash.h> 279a74af21SBoaz Harrosh #include <linux/ima.h> 285a0e3ad6STejun Heo #include <linux/slab.h> 297c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 30f501912aSBen Myers #include <linux/exportfs.h> 31f501912aSBen Myers #include <linux/writeback.h> 3218032ca0SDavid Quigley #include <linux/security.h> 339a74af21SBoaz Harrosh 349a74af21SBoaz Harrosh #ifdef CONFIG_NFSD_V3 359a74af21SBoaz Harrosh #include "xdr3.h" 369a74af21SBoaz Harrosh #endif /* CONFIG_NFSD_V3 */ 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" 421da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V4 */ 431da177e4SLinus Torvalds 449a74af21SBoaz Harrosh #include "nfsd.h" 459a74af21SBoaz Harrosh #include "vfs.h" 466e8b50d1SJeff Layton #include "trace.h" 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds #define NFSDDBG_FACILITY NFSDDBG_FILEOP 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds /* 521da177e4SLinus Torvalds * This is a cache of readahead params that help us choose the proper 531da177e4SLinus Torvalds * readahead strategy. Initially, we set all readahead parameters to 0 541da177e4SLinus Torvalds * and let the VFS handle things. 551da177e4SLinus Torvalds * If you increase the number of cached files very much, you'll need to 561da177e4SLinus Torvalds * add a hash table here. 571da177e4SLinus Torvalds */ 581da177e4SLinus Torvalds struct raparms { 591da177e4SLinus Torvalds struct raparms *p_next; 601da177e4SLinus Torvalds unsigned int p_count; 611da177e4SLinus Torvalds ino_t p_ino; 621da177e4SLinus Torvalds dev_t p_dev; 631da177e4SLinus Torvalds int p_set; 641da177e4SLinus Torvalds struct file_ra_state p_ra; 65fce1456aSGreg Banks unsigned int p_hindex; 661da177e4SLinus Torvalds }; 671da177e4SLinus Torvalds 68fce1456aSGreg Banks struct raparm_hbucket { 69fce1456aSGreg Banks struct raparms *pb_head; 70fce1456aSGreg Banks spinlock_t pb_lock; 71fce1456aSGreg Banks } ____cacheline_aligned_in_smp; 72fce1456aSGreg Banks 73fce1456aSGreg Banks #define RAPARM_HASH_BITS 4 74fce1456aSGreg Banks #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) 75fce1456aSGreg Banks #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) 76fce1456aSGreg Banks static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds /* 791da177e4SLinus Torvalds * Called from nfsd_lookup and encode_dirent. Check if we have crossed 801da177e4SLinus Torvalds * a mount point. 81e0bb89efSJ.Bruce Fields * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, 821da177e4SLinus Torvalds * or nfs_ok having possibly changed *dpp and *expp 831da177e4SLinus Torvalds */ 841da177e4SLinus Torvalds int 851da177e4SLinus Torvalds nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 861da177e4SLinus Torvalds struct svc_export **expp) 871da177e4SLinus Torvalds { 881da177e4SLinus Torvalds struct svc_export *exp = *expp, *exp2 = NULL; 891da177e4SLinus Torvalds struct dentry *dentry = *dpp; 9091c9fa8fSAl Viro struct path path = {.mnt = mntget(exp->ex_path.mnt), 9191c9fa8fSAl Viro .dentry = dget(dentry)}; 926264d69dSAl Viro int err = 0; 931da177e4SLinus Torvalds 947cc90cc3SAl Viro err = follow_down(&path); 95cc53ce53SDavid Howells if (err < 0) 96cc53ce53SDavid Howells goto out; 971da177e4SLinus Torvalds 9891c9fa8fSAl Viro exp2 = rqst_exp_get_by_name(rqstp, &path); 991da177e4SLinus Torvalds if (IS_ERR(exp2)) { 1001da177e4SLinus Torvalds err = PTR_ERR(exp2); 1013b6cee7bSJ. Bruce Fields /* 1023b6cee7bSJ. Bruce Fields * We normally allow NFS clients to continue 1033b6cee7bSJ. Bruce Fields * "underneath" a mountpoint that is not exported. 1043b6cee7bSJ. Bruce Fields * The exception is V4ROOT, where no traversal is ever 1053b6cee7bSJ. Bruce Fields * allowed without an explicit export of the new 1063b6cee7bSJ. Bruce Fields * directory. 1073b6cee7bSJ. Bruce Fields */ 1083b6cee7bSJ. Bruce Fields if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) 1093b6cee7bSJ. Bruce Fields err = 0; 11091c9fa8fSAl Viro path_put(&path); 1111da177e4SLinus Torvalds goto out; 1121da177e4SLinus Torvalds } 1133c394ddaSSteve Dickson if (nfsd_v4client(rqstp) || 1143c394ddaSSteve Dickson (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { 1151da177e4SLinus Torvalds /* successfully crossed mount point */ 1161644ccc8SAl Viro /* 11791c9fa8fSAl Viro * This is subtle: path.dentry is *not* on path.mnt 11891c9fa8fSAl Viro * at this point. The only reason we are safe is that 11991c9fa8fSAl Viro * original mnt is pinned down by exp, so we should 12091c9fa8fSAl Viro * put path *before* putting exp 1211644ccc8SAl Viro */ 12291c9fa8fSAl Viro *dpp = path.dentry; 12391c9fa8fSAl Viro path.dentry = dentry; 1241644ccc8SAl Viro *expp = exp2; 12591c9fa8fSAl Viro exp2 = exp; 1261da177e4SLinus Torvalds } 12791c9fa8fSAl Viro path_put(&path); 12891c9fa8fSAl Viro exp_put(exp2); 1291da177e4SLinus Torvalds out: 1301da177e4SLinus Torvalds return err; 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds 133289ede45SJ. Bruce Fields static void follow_to_parent(struct path *path) 134289ede45SJ. Bruce Fields { 135289ede45SJ. Bruce Fields struct dentry *dp; 136289ede45SJ. Bruce Fields 137289ede45SJ. Bruce Fields while (path->dentry == path->mnt->mnt_root && follow_up(path)) 138289ede45SJ. Bruce Fields ; 139289ede45SJ. Bruce Fields dp = dget_parent(path->dentry); 140289ede45SJ. Bruce Fields dput(path->dentry); 141289ede45SJ. Bruce Fields path->dentry = dp; 142289ede45SJ. Bruce Fields } 143289ede45SJ. Bruce Fields 144289ede45SJ. Bruce Fields static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) 145289ede45SJ. Bruce Fields { 146289ede45SJ. Bruce Fields struct svc_export *exp2; 147289ede45SJ. Bruce Fields struct path path = {.mnt = mntget((*exp)->ex_path.mnt), 148289ede45SJ. Bruce Fields .dentry = dget(dparent)}; 149289ede45SJ. Bruce Fields 150289ede45SJ. Bruce Fields follow_to_parent(&path); 151289ede45SJ. Bruce Fields 152289ede45SJ. Bruce Fields exp2 = rqst_exp_parent(rqstp, &path); 153289ede45SJ. Bruce Fields if (PTR_ERR(exp2) == -ENOENT) { 154289ede45SJ. Bruce Fields *dentryp = dget(dparent); 155289ede45SJ. Bruce Fields } else if (IS_ERR(exp2)) { 156289ede45SJ. Bruce Fields path_put(&path); 157289ede45SJ. Bruce Fields return PTR_ERR(exp2); 158289ede45SJ. Bruce Fields } else { 159289ede45SJ. Bruce Fields *dentryp = dget(path.dentry); 160289ede45SJ. Bruce Fields exp_put(*exp); 161289ede45SJ. Bruce Fields *exp = exp2; 162289ede45SJ. Bruce Fields } 163289ede45SJ. Bruce Fields path_put(&path); 164289ede45SJ. Bruce Fields return 0; 165289ede45SJ. Bruce Fields } 166289ede45SJ. Bruce Fields 16782ead7feSJ. Bruce Fields /* 16882ead7feSJ. Bruce Fields * For nfsd purposes, we treat V4ROOT exports as though there was an 16982ead7feSJ. Bruce Fields * export at *every* directory. 17082ead7feSJ. Bruce Fields */ 1713227fa41SJ. Bruce Fields int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) 17282ead7feSJ. Bruce Fields { 17382ead7feSJ. Bruce Fields if (d_mountpoint(dentry)) 17482ead7feSJ. Bruce Fields return 1; 17511fcee02STrond Myklebust if (nfsd4_is_junction(dentry)) 17611fcee02STrond Myklebust return 1; 17782ead7feSJ. Bruce Fields if (!(exp->ex_flags & NFSEXP_V4ROOT)) 17882ead7feSJ. Bruce Fields return 0; 1792b0143b5SDavid Howells return d_inode(dentry) != NULL; 18082ead7feSJ. Bruce Fields } 18182ead7feSJ. Bruce Fields 1826264d69dSAl Viro __be32 1836c0a654dSJ. Bruce Fields nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, 1845a022fc8SChuck Lever const char *name, unsigned int len, 1856c0a654dSJ. Bruce Fields struct svc_export **exp_ret, struct dentry **dentry_ret) 1861da177e4SLinus Torvalds { 1871da177e4SLinus Torvalds struct svc_export *exp; 1881da177e4SLinus Torvalds struct dentry *dparent; 1891da177e4SLinus Torvalds struct dentry *dentry; 1906264d69dSAl Viro int host_err; 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds dparent = fhp->fh_dentry; 195bf18f163SKinglong Mee exp = exp_get(fhp->fh_export); 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds /* Lookup the name, but don't follow links */ 1981da177e4SLinus Torvalds if (isdotent(name, len)) { 1991da177e4SLinus Torvalds if (len==1) 2001da177e4SLinus Torvalds dentry = dget(dparent); 20154775491SJan Blunck else if (dparent != exp->ex_path.dentry) 2021da177e4SLinus Torvalds dentry = dget_parent(dparent); 203fed83811SJ. Bruce Fields else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) 2041da177e4SLinus Torvalds dentry = dget(dparent); /* .. == . just like at / */ 2051da177e4SLinus Torvalds else { 2061da177e4SLinus Torvalds /* checking mountpoint crossing is very different when stepping up */ 207289ede45SJ. Bruce Fields host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); 208289ede45SJ. Bruce Fields if (host_err) 2091da177e4SLinus Torvalds goto out_nfserr; 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds } else { 2124335723eSJ. Bruce Fields /* 2134335723eSJ. Bruce Fields * In the nfsd4_open() case, this may be held across 2144335723eSJ. Bruce Fields * subsequent open and delegation acquisition which may 2154335723eSJ. Bruce Fields * need to take the child's i_mutex: 2164335723eSJ. Bruce Fields */ 2174335723eSJ. Bruce Fields fh_lock_nested(fhp, I_MUTEX_PARENT); 2181da177e4SLinus Torvalds dentry = lookup_one_len(name, dparent, len); 2196264d69dSAl Viro host_err = PTR_ERR(dentry); 2201da177e4SLinus Torvalds if (IS_ERR(dentry)) 2211da177e4SLinus Torvalds goto out_nfserr; 22282ead7feSJ. Bruce Fields if (nfsd_mountpoint(dentry, exp)) { 223bbddca8eSNeilBrown /* 224bbddca8eSNeilBrown * We don't need the i_mutex after all. It's 225bbddca8eSNeilBrown * still possible we could open this (regular 226bbddca8eSNeilBrown * files can be mountpoints too), but the 227bbddca8eSNeilBrown * i_mutex is just there to prevent renames of 228bbddca8eSNeilBrown * something that we might be about to delegate, 229bbddca8eSNeilBrown * and a mountpoint won't be renamed: 230bbddca8eSNeilBrown */ 231bbddca8eSNeilBrown fh_unlock(fhp); 2326264d69dSAl Viro if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 2331da177e4SLinus Torvalds dput(dentry); 2341da177e4SLinus Torvalds goto out_nfserr; 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds } 2371da177e4SLinus Torvalds } 2386c0a654dSJ. Bruce Fields *dentry_ret = dentry; 2396c0a654dSJ. Bruce Fields *exp_ret = exp; 2406c0a654dSJ. Bruce Fields return 0; 2416c0a654dSJ. Bruce Fields 2426c0a654dSJ. Bruce Fields out_nfserr: 2436c0a654dSJ. Bruce Fields exp_put(exp); 2446c0a654dSJ. Bruce Fields return nfserrno(host_err); 2456c0a654dSJ. Bruce Fields } 2466c0a654dSJ. Bruce Fields 2476c0a654dSJ. Bruce Fields /* 2486c0a654dSJ. Bruce Fields * Look up one component of a pathname. 2496c0a654dSJ. Bruce Fields * N.B. After this call _both_ fhp and resfh need an fh_put 2506c0a654dSJ. Bruce Fields * 2516c0a654dSJ. Bruce Fields * If the lookup would cross a mountpoint, and the mounted filesystem 2526c0a654dSJ. Bruce Fields * is exported to the client with NFSEXP_NOHIDE, then the lookup is 2536c0a654dSJ. Bruce Fields * accepted as it stands and the mounted directory is 2546c0a654dSJ. Bruce Fields * returned. Otherwise the covered directory is returned. 2556c0a654dSJ. Bruce Fields * NOTE: this mountpoint crossing is not supported properly by all 2566c0a654dSJ. Bruce Fields * clients and is explicitly disallowed for NFSv3 2576c0a654dSJ. Bruce Fields * NeilBrown <neilb@cse.unsw.edu.au> 2586c0a654dSJ. Bruce Fields */ 2596c0a654dSJ. Bruce Fields __be32 2606c0a654dSJ. Bruce Fields nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 2615a022fc8SChuck Lever unsigned int len, struct svc_fh *resfh) 2626c0a654dSJ. Bruce Fields { 2636c0a654dSJ. Bruce Fields struct svc_export *exp; 2646c0a654dSJ. Bruce Fields struct dentry *dentry; 2656c0a654dSJ. Bruce Fields __be32 err; 2666c0a654dSJ. Bruce Fields 26729a78a3eSJ. Bruce Fields err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 26829a78a3eSJ. Bruce Fields if (err) 26929a78a3eSJ. Bruce Fields return err; 2706c0a654dSJ. Bruce Fields err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); 2716c0a654dSJ. Bruce Fields if (err) 2726c0a654dSJ. Bruce Fields return err; 27332c1eb0cSAndy Adamson err = check_nfsd_access(exp, rqstp); 27432c1eb0cSAndy Adamson if (err) 27532c1eb0cSAndy Adamson goto out; 2761da177e4SLinus Torvalds /* 2771da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2781da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2791da177e4SLinus Torvalds */ 2801da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2812b0143b5SDavid Howells if (!err && d_really_is_negative(dentry)) 2821da177e4SLinus Torvalds err = nfserr_noent; 28332c1eb0cSAndy Adamson out: 2841da177e4SLinus Torvalds dput(dentry); 2851da177e4SLinus Torvalds exp_put(exp); 2861da177e4SLinus Torvalds return err; 2871da177e4SLinus Torvalds } 2881da177e4SLinus Torvalds 289f501912aSBen Myers /* 290f501912aSBen Myers * Commit metadata changes to stable storage. 291f501912aSBen Myers */ 292f501912aSBen Myers static int 293f501912aSBen Myers commit_metadata(struct svc_fh *fhp) 294f501912aSBen Myers { 2952b0143b5SDavid Howells struct inode *inode = d_inode(fhp->fh_dentry); 296f501912aSBen Myers const struct export_operations *export_ops = inode->i_sb->s_export_op; 297f501912aSBen Myers 298f501912aSBen Myers if (!EX_ISSYNC(fhp->fh_export)) 299f501912aSBen Myers return 0; 300f501912aSBen Myers 301c3765016SChristoph Hellwig if (export_ops->commit_metadata) 302c3765016SChristoph Hellwig return export_ops->commit_metadata(inode); 303c3765016SChristoph Hellwig return sync_inode_metadata(inode, 1); 304f501912aSBen Myers } 3056c0a654dSJ. Bruce Fields 3061da177e4SLinus Torvalds /* 307818e5a22SChristoph Hellwig * Go over the attributes and take care of the small differences between 308818e5a22SChristoph Hellwig * NFS semantics and what Linux expects. 309818e5a22SChristoph Hellwig */ 310818e5a22SChristoph Hellwig static void 311818e5a22SChristoph Hellwig nfsd_sanitize_attrs(struct inode *inode, struct iattr *iap) 312818e5a22SChristoph Hellwig { 313818e5a22SChristoph Hellwig /* sanitize the mode change */ 314818e5a22SChristoph Hellwig if (iap->ia_valid & ATTR_MODE) { 315818e5a22SChristoph Hellwig iap->ia_mode &= S_IALLUGO; 316818e5a22SChristoph Hellwig iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); 317818e5a22SChristoph Hellwig } 318818e5a22SChristoph Hellwig 319818e5a22SChristoph Hellwig /* Revoke setuid/setgid on chown */ 320818e5a22SChristoph Hellwig if (!S_ISDIR(inode->i_mode) && 321c4fa6d7cSStanislav Kholmanskikh ((iap->ia_valid & ATTR_UID) || (iap->ia_valid & ATTR_GID))) { 322818e5a22SChristoph Hellwig iap->ia_valid |= ATTR_KILL_PRIV; 323818e5a22SChristoph Hellwig if (iap->ia_valid & ATTR_MODE) { 324818e5a22SChristoph Hellwig /* we're setting mode too, just clear the s*id bits */ 325818e5a22SChristoph Hellwig iap->ia_mode &= ~S_ISUID; 326818e5a22SChristoph Hellwig if (iap->ia_mode & S_IXGRP) 327818e5a22SChristoph Hellwig iap->ia_mode &= ~S_ISGID; 328818e5a22SChristoph Hellwig } else { 329818e5a22SChristoph Hellwig /* set ATTR_KILL_* bits and let VFS handle it */ 330818e5a22SChristoph Hellwig iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); 331818e5a22SChristoph Hellwig } 332818e5a22SChristoph Hellwig } 333818e5a22SChristoph Hellwig } 334818e5a22SChristoph Hellwig 3350839ffb8SJ. Bruce Fields static __be32 3360839ffb8SJ. Bruce Fields nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp, 3370839ffb8SJ. Bruce Fields struct iattr *iap) 3380839ffb8SJ. Bruce Fields { 3390839ffb8SJ. Bruce Fields struct inode *inode = d_inode(fhp->fh_dentry); 3400839ffb8SJ. Bruce Fields int host_err; 3410839ffb8SJ. Bruce Fields 3420839ffb8SJ. Bruce Fields if (iap->ia_size < inode->i_size) { 3430839ffb8SJ. Bruce Fields __be32 err; 3440839ffb8SJ. Bruce Fields 3450839ffb8SJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 3460839ffb8SJ. Bruce Fields NFSD_MAY_TRUNC | NFSD_MAY_OWNER_OVERRIDE); 3470839ffb8SJ. Bruce Fields if (err) 3480839ffb8SJ. Bruce Fields return err; 3490839ffb8SJ. Bruce Fields } 3500839ffb8SJ. Bruce Fields 3510839ffb8SJ. Bruce Fields host_err = get_write_access(inode); 3520839ffb8SJ. Bruce Fields if (host_err) 3530839ffb8SJ. Bruce Fields goto out_nfserrno; 3540839ffb8SJ. Bruce Fields 3550839ffb8SJ. Bruce Fields host_err = locks_verify_truncate(inode, NULL, iap->ia_size); 3560839ffb8SJ. Bruce Fields if (host_err) 3570839ffb8SJ. Bruce Fields goto out_put_write_access; 3580839ffb8SJ. Bruce Fields return 0; 3590839ffb8SJ. Bruce Fields 3600839ffb8SJ. Bruce Fields out_put_write_access: 3610839ffb8SJ. Bruce Fields put_write_access(inode); 3620839ffb8SJ. Bruce Fields out_nfserrno: 3630839ffb8SJ. Bruce Fields return nfserrno(host_err); 3640839ffb8SJ. Bruce Fields } 3650839ffb8SJ. Bruce Fields 366818e5a22SChristoph Hellwig /* 367818e5a22SChristoph Hellwig * Set various file attributes. After this call fhp needs an fh_put. 3681da177e4SLinus Torvalds */ 3696264d69dSAl Viro __be32 3701da177e4SLinus Torvalds nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 3711da177e4SLinus Torvalds int check_guard, time_t guardtime) 3721da177e4SLinus Torvalds { 3731da177e4SLinus Torvalds struct dentry *dentry; 3741da177e4SLinus Torvalds struct inode *inode; 3758837abcaSMiklos Szeredi int accmode = NFSD_MAY_SATTR; 376175a4eb7SAl Viro umode_t ftype = 0; 3776264d69dSAl Viro __be32 err; 3786264d69dSAl Viro int host_err; 3799f67f189SJ. Bruce Fields bool get_write_count; 380758e99feSChristoph Hellwig bool size_change = (iap->ia_valid & ATTR_SIZE); 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) 3838837abcaSMiklos Szeredi accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; 3841da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) 3851da177e4SLinus Torvalds ftype = S_IFREG; 3861da177e4SLinus Torvalds 3879f67f189SJ. Bruce Fields /* Callers that do fh_verify should do the fh_want_write: */ 3889f67f189SJ. Bruce Fields get_write_count = !fhp->fh_dentry; 3899f67f189SJ. Bruce Fields 3901da177e4SLinus Torvalds /* Get inode */ 3911da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 39215b7a1b8SNeilBrown if (err) 393758e99feSChristoph Hellwig return err; 3949f67f189SJ. Bruce Fields if (get_write_count) { 3959f67f189SJ. Bruce Fields host_err = fh_want_write(fhp); 3969f67f189SJ. Bruce Fields if (host_err) 397758e99feSChristoph Hellwig goto out; 3989f67f189SJ. Bruce Fields } 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds dentry = fhp->fh_dentry; 4012b0143b5SDavid Howells inode = d_inode(dentry); 4021da177e4SLinus Torvalds 40315b7a1b8SNeilBrown /* Ignore any mode updates on symlinks */ 40415b7a1b8SNeilBrown if (S_ISLNK(inode->i_mode)) 40515b7a1b8SNeilBrown iap->ia_valid &= ~ATTR_MODE; 40615b7a1b8SNeilBrown 40715b7a1b8SNeilBrown if (!iap->ia_valid) 408758e99feSChristoph Hellwig return 0; 40915b7a1b8SNeilBrown 410818e5a22SChristoph Hellwig nfsd_sanitize_attrs(inode, iap); 4111da177e4SLinus Torvalds 412758e99feSChristoph Hellwig if (check_guard && guardtime != inode->i_ctime.tv_sec) 413758e99feSChristoph Hellwig return nfserr_notsync; 414758e99feSChristoph Hellwig 415f0c63124SChristoph Hellwig /* 41641f53350SChristoph Hellwig * The size case is special, it changes the file in addition to the 417*783112f7SChristoph Hellwig * attributes, and file systems don't expect it to be mixed with 418*783112f7SChristoph Hellwig * "random" attribute changes. We thus split out the size change 419*783112f7SChristoph Hellwig * into a separate call to ->setattr, and do the rest as a separate 420*783112f7SChristoph Hellwig * setattr call. 421f0c63124SChristoph Hellwig */ 422758e99feSChristoph Hellwig if (size_change) { 4230839ffb8SJ. Bruce Fields err = nfsd_get_write_access(rqstp, fhp, iap); 4240839ffb8SJ. Bruce Fields if (err) 425758e99feSChristoph Hellwig return err; 426*783112f7SChristoph Hellwig } 42741f53350SChristoph Hellwig 428*783112f7SChristoph Hellwig fh_lock(fhp); 429*783112f7SChristoph Hellwig if (size_change) { 43041f53350SChristoph Hellwig /* 4310839ffb8SJ. Bruce Fields * RFC5661, Section 18.30.4: 4320839ffb8SJ. Bruce Fields * Changing the size of a file with SETATTR indirectly 4330839ffb8SJ. Bruce Fields * changes the time_modify and change attributes. 4340839ffb8SJ. Bruce Fields * 4350839ffb8SJ. Bruce Fields * (and similar for the older RFCs) 43641f53350SChristoph Hellwig */ 437*783112f7SChristoph Hellwig struct iattr size_attr = { 438*783112f7SChristoph Hellwig .ia_valid = ATTR_SIZE | ATTR_CTIME | ATTR_MTIME, 439*783112f7SChristoph Hellwig .ia_size = iap->ia_size, 440*783112f7SChristoph Hellwig }; 441*783112f7SChristoph Hellwig 442*783112f7SChristoph Hellwig host_err = notify_change(dentry, &size_attr, NULL); 443*783112f7SChristoph Hellwig if (host_err) 444*783112f7SChristoph Hellwig goto out_unlock; 445*783112f7SChristoph Hellwig iap->ia_valid &= ~ATTR_SIZE; 446*783112f7SChristoph Hellwig 447*783112f7SChristoph Hellwig /* 448*783112f7SChristoph Hellwig * Avoid the additional setattr call below if the only other 449*783112f7SChristoph Hellwig * attribute that the client sends is the mtime, as we update 450*783112f7SChristoph Hellwig * it as part of the size change above. 451*783112f7SChristoph Hellwig */ 452*783112f7SChristoph Hellwig if ((iap->ia_valid & ~ATTR_MTIME) == 0) 453*783112f7SChristoph Hellwig goto out_unlock; 4541da177e4SLinus Torvalds } 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 45727ac0ffeSJ. Bruce Fields host_err = notify_change(dentry, iap, NULL); 458987da479SChristoph Hellwig 459*783112f7SChristoph Hellwig out_unlock: 460*783112f7SChristoph Hellwig fh_unlock(fhp); 4610839ffb8SJ. Bruce Fields if (size_change) 4620839ffb8SJ. Bruce Fields put_write_access(inode); 4630839ffb8SJ. Bruce Fields out: 464758e99feSChristoph Hellwig if (!host_err) 465758e99feSChristoph Hellwig host_err = commit_metadata(fhp); 466758e99feSChristoph Hellwig return nfserrno(host_err); 4671da177e4SLinus Torvalds } 4681da177e4SLinus Torvalds 4695be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V4) 4709b4146e8SChuck Lever /* 4719b4146e8SChuck Lever * NFS junction information is stored in an extended attribute. 4729b4146e8SChuck Lever */ 4739b4146e8SChuck Lever #define NFSD_JUNCTION_XATTR_NAME XATTR_TRUSTED_PREFIX "junction.nfs" 4749b4146e8SChuck Lever 4759b4146e8SChuck Lever /** 4769b4146e8SChuck Lever * nfsd4_is_junction - Test if an object could be an NFS junction 4779b4146e8SChuck Lever * 4789b4146e8SChuck Lever * @dentry: object to test 4799b4146e8SChuck Lever * 4809b4146e8SChuck Lever * Returns 1 if "dentry" appears to contain NFS junction information. 4819b4146e8SChuck Lever * Otherwise 0 is returned. 4829b4146e8SChuck Lever */ 48311fcee02STrond Myklebust int nfsd4_is_junction(struct dentry *dentry) 48411fcee02STrond Myklebust { 4852b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 48611fcee02STrond Myklebust 48711fcee02STrond Myklebust if (inode == NULL) 48811fcee02STrond Myklebust return 0; 48911fcee02STrond Myklebust if (inode->i_mode & S_IXUGO) 49011fcee02STrond Myklebust return 0; 49111fcee02STrond Myklebust if (!(inode->i_mode & S_ISVTX)) 49211fcee02STrond Myklebust return 0; 4939b4146e8SChuck Lever if (vfs_getxattr(dentry, NFSD_JUNCTION_XATTR_NAME, NULL, 0) <= 0) 49411fcee02STrond Myklebust return 0; 49511fcee02STrond Myklebust return 1; 49611fcee02STrond Myklebust } 49718032ca0SDavid Quigley #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 49818032ca0SDavid Quigley __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp, 49918032ca0SDavid Quigley struct xdr_netobj *label) 50018032ca0SDavid Quigley { 50118032ca0SDavid Quigley __be32 error; 50218032ca0SDavid Quigley int host_error; 50318032ca0SDavid Quigley struct dentry *dentry; 50418032ca0SDavid Quigley 50518032ca0SDavid Quigley error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); 50618032ca0SDavid Quigley if (error) 50718032ca0SDavid Quigley return error; 50818032ca0SDavid Quigley 50918032ca0SDavid Quigley dentry = fhp->fh_dentry; 51018032ca0SDavid Quigley 5115955102cSAl Viro inode_lock(d_inode(dentry)); 51218032ca0SDavid Quigley host_error = security_inode_setsecctx(dentry, label->data, label->len); 5135955102cSAl Viro inode_unlock(d_inode(dentry)); 51418032ca0SDavid Quigley return nfserrno(host_error); 51518032ca0SDavid Quigley } 51618032ca0SDavid Quigley #else 51718032ca0SDavid Quigley __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp, 51818032ca0SDavid Quigley struct xdr_netobj *label) 51918032ca0SDavid Quigley { 52018032ca0SDavid Quigley return nfserr_notsupp; 52118032ca0SDavid Quigley } 52218032ca0SDavid Quigley #endif 52318032ca0SDavid Quigley 524ffa0160aSChristoph Hellwig __be32 nfsd4_clone_file_range(struct file *src, u64 src_pos, struct file *dst, 525ffa0160aSChristoph Hellwig u64 dst_pos, u64 count) 526ffa0160aSChristoph Hellwig { 527031a072aSAmir Goldstein return nfserrno(do_clone_file_range(src, src_pos, dst, dst_pos, count)); 528ffa0160aSChristoph Hellwig } 529ffa0160aSChristoph Hellwig 53029ae7f9dSAnna Schumaker ssize_t nfsd_copy_file_range(struct file *src, u64 src_pos, struct file *dst, 53129ae7f9dSAnna Schumaker u64 dst_pos, u64 count) 53229ae7f9dSAnna Schumaker { 53329ae7f9dSAnna Schumaker 53429ae7f9dSAnna Schumaker /* 53529ae7f9dSAnna Schumaker * Limit copy to 4MB to prevent indefinitely blocking an nfsd 53629ae7f9dSAnna Schumaker * thread and client rpc slot. The choice of 4MB is somewhat 53729ae7f9dSAnna Schumaker * arbitrary. We might instead base this on r/wsize, or make it 53829ae7f9dSAnna Schumaker * tunable, or use a time instead of a byte limit, or implement 53929ae7f9dSAnna Schumaker * asynchronous copy. In theory a client could also recognize a 54029ae7f9dSAnna Schumaker * limit like this and pipeline multiple COPY requests. 54129ae7f9dSAnna Schumaker */ 54229ae7f9dSAnna Schumaker count = min_t(u64, count, 1 << 22); 54329ae7f9dSAnna Schumaker return vfs_copy_file_range(src, src_pos, dst, dst_pos, count, 0); 54429ae7f9dSAnna Schumaker } 54529ae7f9dSAnna Schumaker 54695d871f0SAnna Schumaker __be32 nfsd4_vfs_fallocate(struct svc_rqst *rqstp, struct svc_fh *fhp, 54795d871f0SAnna Schumaker struct file *file, loff_t offset, loff_t len, 54895d871f0SAnna Schumaker int flags) 54995d871f0SAnna Schumaker { 55095d871f0SAnna Schumaker int error; 55195d871f0SAnna Schumaker 55295d871f0SAnna Schumaker if (!S_ISREG(file_inode(file)->i_mode)) 55395d871f0SAnna Schumaker return nfserr_inval; 55495d871f0SAnna Schumaker 55595d871f0SAnna Schumaker error = vfs_fallocate(file, flags, offset, len); 55695d871f0SAnna Schumaker if (!error) 55795d871f0SAnna Schumaker error = commit_metadata(fhp); 55895d871f0SAnna Schumaker 55995d871f0SAnna Schumaker return nfserrno(error); 56095d871f0SAnna Schumaker } 5616a85d6c7SJ. Bruce Fields #endif /* defined(CONFIG_NFSD_V4) */ 5621da177e4SLinus Torvalds 5631da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 5641da177e4SLinus Torvalds /* 5651da177e4SLinus Torvalds * Check server access rights to a file system object 5661da177e4SLinus Torvalds */ 5671da177e4SLinus Torvalds struct accessmap { 5681da177e4SLinus Torvalds u32 access; 5691da177e4SLinus Torvalds int how; 5701da177e4SLinus Torvalds }; 5711da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 5728837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 5738837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 5748837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, 5758837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvalds { 0, 0 } 5781da177e4SLinus Torvalds }; 5791da177e4SLinus Torvalds 5801da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 5818837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 5828837abcaSMiklos Szeredi { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, 5838837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, 5848837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, 5858837abcaSMiklos Szeredi { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds { 0, 0 } 5881da177e4SLinus Torvalds }; 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 5911da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 5921da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 5931da177e4SLinus Torvalds * (which really, the server doesn't care about). So 5941da177e4SLinus Torvalds * We provide simple access checking for them, looking 5951da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 5961da177e4SLinus Torvalds * filesystem checks 5971da177e4SLinus Torvalds */ 5988837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 5998837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6008837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6018837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6021da177e4SLinus Torvalds 6031da177e4SLinus Torvalds { 0, 0 } 6041da177e4SLinus Torvalds }; 6051da177e4SLinus Torvalds 6066264d69dSAl Viro __be32 6071da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 6081da177e4SLinus Torvalds { 6091da177e4SLinus Torvalds struct accessmap *map; 6101da177e4SLinus Torvalds struct svc_export *export; 6111da177e4SLinus Torvalds struct dentry *dentry; 6121da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 6136264d69dSAl Viro __be32 error; 6141da177e4SLinus Torvalds 6158837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 6161da177e4SLinus Torvalds if (error) 6171da177e4SLinus Torvalds goto out; 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds export = fhp->fh_export; 6201da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6211da177e4SLinus Torvalds 622e36cb0b8SDavid Howells if (d_is_reg(dentry)) 6231da177e4SLinus Torvalds map = nfs3_regaccess; 624e36cb0b8SDavid Howells else if (d_is_dir(dentry)) 6251da177e4SLinus Torvalds map = nfs3_diraccess; 6261da177e4SLinus Torvalds else 6271da177e4SLinus Torvalds map = nfs3_anyaccess; 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds query = *access; 6311da177e4SLinus Torvalds for (; map->access; map++) { 6321da177e4SLinus Torvalds if (map->access & query) { 6336264d69dSAl Viro __be32 err2; 6341da177e4SLinus Torvalds 6351da177e4SLinus Torvalds sresult |= map->access; 6361da177e4SLinus Torvalds 6370ec757dfSJ. Bruce Fields err2 = nfsd_permission(rqstp, export, dentry, map->how); 6381da177e4SLinus Torvalds switch (err2) { 6391da177e4SLinus Torvalds case nfs_ok: 6401da177e4SLinus Torvalds result |= map->access; 6411da177e4SLinus Torvalds break; 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 6441da177e4SLinus Torvalds * rather than an error occurred */ 6451da177e4SLinus Torvalds case nfserr_rofs: 6461da177e4SLinus Torvalds case nfserr_acces: 6471da177e4SLinus Torvalds case nfserr_perm: 6481da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 6491da177e4SLinus Torvalds break; 6501da177e4SLinus Torvalds default: 6511da177e4SLinus Torvalds error = err2; 6521da177e4SLinus Torvalds goto out; 6531da177e4SLinus Torvalds } 6541da177e4SLinus Torvalds } 6551da177e4SLinus Torvalds } 6561da177e4SLinus Torvalds *access = result; 6571da177e4SLinus Torvalds if (supported) 6581da177e4SLinus Torvalds *supported = sresult; 6591da177e4SLinus Torvalds 6601da177e4SLinus Torvalds out: 6611da177e4SLinus Torvalds return error; 6621da177e4SLinus Torvalds } 6631da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 6641da177e4SLinus Torvalds 665105f4622SJ. Bruce Fields static int nfsd_open_break_lease(struct inode *inode, int access) 666105f4622SJ. Bruce Fields { 667105f4622SJ. Bruce Fields unsigned int mode; 6681da177e4SLinus Torvalds 669105f4622SJ. Bruce Fields if (access & NFSD_MAY_NOT_BREAK_LEASE) 670105f4622SJ. Bruce Fields return 0; 671105f4622SJ. Bruce Fields mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; 672105f4622SJ. Bruce Fields return break_lease(inode, mode | O_NONBLOCK); 673105f4622SJ. Bruce Fields } 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds /* 6761da177e4SLinus Torvalds * Open an existing file or directory. 677999448a8SBernd Schubert * The may_flags argument indicates the type of open (read/write/lock) 678999448a8SBernd Schubert * and additional flags. 6791da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 6801da177e4SLinus Torvalds */ 6816264d69dSAl Viro __be32 682175a4eb7SAl Viro nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, 683999448a8SBernd Schubert int may_flags, struct file **filp) 6841da177e4SLinus Torvalds { 685765927b2SAl Viro struct path path; 6861da177e4SLinus Torvalds struct inode *inode; 6878519f994SKinglong Mee struct file *file; 6886264d69dSAl Viro int flags = O_RDONLY|O_LARGEFILE; 6896264d69dSAl Viro __be32 err; 69091885258SJeff Layton int host_err = 0; 6911da177e4SLinus Torvalds 692e0e81739SDavid Howells validate_process_creds(); 693e0e81739SDavid Howells 6941da177e4SLinus Torvalds /* 6951da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 6961da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 6971da177e4SLinus Torvalds * in case a chmod has now revoked permission. 698d91d0b56SJ. Bruce Fields * 699d91d0b56SJ. Bruce Fields * Arguably we should also allow the owner override for 700d91d0b56SJ. Bruce Fields * directories, but we never have and it doesn't seem to have 701d91d0b56SJ. Bruce Fields * caused anyone a problem. If we were to change this, note 702d91d0b56SJ. Bruce Fields * also that our filldir callbacks would need a variant of 703d91d0b56SJ. Bruce Fields * lookup_one_len that doesn't check permissions. 7041da177e4SLinus Torvalds */ 705d91d0b56SJ. Bruce Fields if (type == S_IFREG) 706d91d0b56SJ. Bruce Fields may_flags |= NFSD_MAY_OWNER_OVERRIDE; 707d91d0b56SJ. Bruce Fields err = fh_verify(rqstp, fhp, type, may_flags); 7081da177e4SLinus Torvalds if (err) 7091da177e4SLinus Torvalds goto out; 7101da177e4SLinus Torvalds 711765927b2SAl Viro path.mnt = fhp->fh_export->ex_path.mnt; 712765927b2SAl Viro path.dentry = fhp->fh_dentry; 7132b0143b5SDavid Howells inode = d_inode(path.dentry); 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 7161da177e4SLinus Torvalds * or any access when mandatory locking enabled 7171da177e4SLinus Torvalds */ 7181da177e4SLinus Torvalds err = nfserr_perm; 719999448a8SBernd Schubert if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE)) 7201da177e4SLinus Torvalds goto out; 7215e7fc436SJ. Bruce Fields /* 7225e7fc436SJ. Bruce Fields * We must ignore files (but only files) which might have mandatory 7235e7fc436SJ. Bruce Fields * locks on them because there is no way to know if the accesser has 7245e7fc436SJ. Bruce Fields * the lock. 7255e7fc436SJ. Bruce Fields */ 7265e7fc436SJ. Bruce Fields if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) 7271da177e4SLinus Torvalds goto out; 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds if (!inode->i_fop) 7301da177e4SLinus Torvalds goto out; 7311da177e4SLinus Torvalds 732999448a8SBernd Schubert host_err = nfsd_open_break_lease(inode, may_flags); 7336264d69dSAl Viro if (host_err) /* NOMEM or WOULDBLOCK */ 7341da177e4SLinus Torvalds goto out_nfserr; 7351da177e4SLinus Torvalds 736999448a8SBernd Schubert if (may_flags & NFSD_MAY_WRITE) { 737999448a8SBernd Schubert if (may_flags & NFSD_MAY_READ) 7389ecb6a08SJ. Bruce Fields flags = O_RDWR|O_LARGEFILE; 7399ecb6a08SJ. Bruce Fields else 7401da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 7411da177e4SLinus Torvalds } 742999448a8SBernd Schubert 7438519f994SKinglong Mee file = dentry_open(&path, flags, current_cred()); 7448519f994SKinglong Mee if (IS_ERR(file)) { 7458519f994SKinglong Mee host_err = PTR_ERR(file); 7468519f994SKinglong Mee goto out_nfserr; 74706effdbbSBernd Schubert } 74806effdbbSBernd Schubert 7495e40d331SLinus Torvalds host_err = ima_file_check(file, may_flags, 0); 7508519f994SKinglong Mee if (host_err) { 751fd891454SChristoph Hellwig fput(file); 7528519f994SKinglong Mee goto out_nfserr; 7538519f994SKinglong Mee } 7548519f994SKinglong Mee 7558519f994SKinglong Mee if (may_flags & NFSD_MAY_64BIT_COOKIE) 7568519f994SKinglong Mee file->f_mode |= FMODE_64BITHASH; 7578519f994SKinglong Mee else 7588519f994SKinglong Mee file->f_mode |= FMODE_32BITHASH; 7598519f994SKinglong Mee 7608519f994SKinglong Mee *filp = file; 7611da177e4SLinus Torvalds out_nfserr: 7626264d69dSAl Viro err = nfserrno(host_err); 7631da177e4SLinus Torvalds out: 764e0e81739SDavid Howells validate_process_creds(); 7651da177e4SLinus Torvalds return err; 7661da177e4SLinus Torvalds } 7671da177e4SLinus Torvalds 768e749a462SChristoph Hellwig struct raparms * 769e749a462SChristoph Hellwig nfsd_init_raparms(struct file *file) 7701da177e4SLinus Torvalds { 771e749a462SChristoph Hellwig struct inode *inode = file_inode(file); 772e749a462SChristoph Hellwig dev_t dev = inode->i_sb->s_dev; 773e749a462SChristoph Hellwig ino_t ino = inode->i_ino; 7741da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 7751da177e4SLinus Torvalds int depth = 0; 776fce1456aSGreg Banks unsigned int hash; 777fce1456aSGreg Banks struct raparm_hbucket *rab; 7781da177e4SLinus Torvalds 779fce1456aSGreg Banks hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; 780fce1456aSGreg Banks rab = &raparm_hash[hash]; 781fce1456aSGreg Banks 782fce1456aSGreg Banks spin_lock(&rab->pb_lock); 783fce1456aSGreg Banks for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { 7841da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 7851da177e4SLinus Torvalds goto found; 7861da177e4SLinus Torvalds depth++; 7871da177e4SLinus Torvalds if (ra->p_count == 0) 7881da177e4SLinus Torvalds frap = rap; 7891da177e4SLinus Torvalds } 7903aa6e0aaSKonstantin Khorenko depth = nfsdstats.ra_size; 7911da177e4SLinus Torvalds if (!frap) { 792fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 7931da177e4SLinus Torvalds return NULL; 7941da177e4SLinus Torvalds } 7951da177e4SLinus Torvalds rap = frap; 7961da177e4SLinus Torvalds ra = *frap; 7971da177e4SLinus Torvalds ra->p_dev = dev; 7981da177e4SLinus Torvalds ra->p_ino = ino; 7991da177e4SLinus Torvalds ra->p_set = 0; 800fce1456aSGreg Banks ra->p_hindex = hash; 8011da177e4SLinus Torvalds found: 802fce1456aSGreg Banks if (rap != &rab->pb_head) { 8031da177e4SLinus Torvalds *rap = ra->p_next; 804fce1456aSGreg Banks ra->p_next = rab->pb_head; 805fce1456aSGreg Banks rab->pb_head = ra; 8061da177e4SLinus Torvalds } 8071da177e4SLinus Torvalds ra->p_count++; 8081da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 809fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 810e749a462SChristoph Hellwig 811e749a462SChristoph Hellwig if (ra->p_set) 812e749a462SChristoph Hellwig file->f_ra = ra->p_ra; 8131da177e4SLinus Torvalds return ra; 8141da177e4SLinus Torvalds } 8151da177e4SLinus Torvalds 816e749a462SChristoph Hellwig void nfsd_put_raparams(struct file *file, struct raparms *ra) 817e749a462SChristoph Hellwig { 818e749a462SChristoph Hellwig struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; 819e749a462SChristoph Hellwig 820e749a462SChristoph Hellwig spin_lock(&rab->pb_lock); 821e749a462SChristoph Hellwig ra->p_ra = file->f_ra; 822e749a462SChristoph Hellwig ra->p_set = 1; 823e749a462SChristoph Hellwig ra->p_count--; 824e749a462SChristoph Hellwig spin_unlock(&rab->pb_lock); 825e749a462SChristoph Hellwig } 826e749a462SChristoph Hellwig 8271da177e4SLinus Torvalds /* 828cf8208d0SJens Axboe * Grab and keep cached pages associated with a file in the svc_rqst 829cf8208d0SJens Axboe * so that they can be passed to the network sendmsg/sendpage routines 830cf8208d0SJens Axboe * directly. They will be released after the sending has completed. 8311da177e4SLinus Torvalds */ 8321da177e4SLinus Torvalds static int 833cf8208d0SJens Axboe nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, 834cf8208d0SJens Axboe struct splice_desc *sd) 8351da177e4SLinus Torvalds { 836cf8208d0SJens Axboe struct svc_rqst *rqstp = sd->u.data; 837afc59400SJ. Bruce Fields struct page **pp = rqstp->rq_next_page; 838cf8208d0SJens Axboe struct page *page = buf->page; 839cf8208d0SJens Axboe size_t size; 840cf8208d0SJens Axboe 841cf8208d0SJens Axboe size = sd->len; 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 8441da177e4SLinus Torvalds get_page(page); 845afc59400SJ. Bruce Fields put_page(*rqstp->rq_next_page); 846afc59400SJ. Bruce Fields *(rqstp->rq_next_page++) = page; 847cf8208d0SJens Axboe rqstp->rq_res.page_base = buf->offset; 8481da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 84944524359SNeilBrown } else if (page != pp[-1]) { 8501da177e4SLinus Torvalds get_page(page); 851afc59400SJ. Bruce Fields if (*rqstp->rq_next_page) 852afc59400SJ. Bruce Fields put_page(*rqstp->rq_next_page); 853afc59400SJ. Bruce Fields *(rqstp->rq_next_page++) = page; 8541da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 85544524359SNeilBrown } else 8561da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8571da177e4SLinus Torvalds 8581da177e4SLinus Torvalds return size; 8591da177e4SLinus Torvalds } 8601da177e4SLinus Torvalds 861cf8208d0SJens Axboe static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, 862cf8208d0SJens Axboe struct splice_desc *sd) 863cf8208d0SJens Axboe { 864cf8208d0SJens Axboe return __splice_from_pipe(pipe, sd, nfsd_splice_actor); 865cf8208d0SJens Axboe } 866cf8208d0SJens Axboe 867e2afc819SJeff Layton static __be32 868e2afc819SJeff Layton nfsd_finish_read(struct file *file, unsigned long *count, int host_err) 8691da177e4SLinus Torvalds { 870dc97618dSJ. Bruce Fields if (host_err >= 0) { 871dc97618dSJ. Bruce Fields nfsdstats.io_read += host_err; 872dc97618dSJ. Bruce Fields *count = host_err; 873dc97618dSJ. Bruce Fields fsnotify_access(file); 874dc97618dSJ. Bruce Fields return 0; 875dc97618dSJ. Bruce Fields } else 876dc97618dSJ. Bruce Fields return nfserrno(host_err); 877dc97618dSJ. Bruce Fields } 8781da177e4SLinus Torvalds 879e2afc819SJeff Layton __be32 nfsd_splice_read(struct svc_rqst *rqstp, 880dc97618dSJ. Bruce Fields struct file *file, loff_t offset, unsigned long *count) 881dc97618dSJ. Bruce Fields { 882cf8208d0SJens Axboe struct splice_desc sd = { 883cf8208d0SJens Axboe .len = 0, 884cf8208d0SJens Axboe .total_len = *count, 885cf8208d0SJens Axboe .pos = offset, 886cf8208d0SJens Axboe .u.data = rqstp, 887cf8208d0SJens Axboe }; 888dc97618dSJ. Bruce Fields int host_err; 889cf8208d0SJens Axboe 890afc59400SJ. Bruce Fields rqstp->rq_next_page = rqstp->rq_respages + 1; 891cf8208d0SJens Axboe host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); 892dc97618dSJ. Bruce Fields return nfsd_finish_read(file, count, host_err); 893dc97618dSJ. Bruce Fields } 894dc97618dSJ. Bruce Fields 895e2afc819SJeff Layton __be32 nfsd_readv(struct file *file, loff_t offset, struct kvec *vec, int vlen, 896dc97618dSJ. Bruce Fields unsigned long *count) 897dc97618dSJ. Bruce Fields { 898dc97618dSJ. Bruce Fields mm_segment_t oldfs; 899dc97618dSJ. Bruce Fields int host_err; 900dc97618dSJ. Bruce Fields 9011da177e4SLinus Torvalds oldfs = get_fs(); 9021da177e4SLinus Torvalds set_fs(KERNEL_DS); 903793b80efSChristoph Hellwig host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset, 0); 9041da177e4SLinus Torvalds set_fs(oldfs); 905dc97618dSJ. Bruce Fields return nfsd_finish_read(file, count, host_err); 9061da177e4SLinus Torvalds } 9071da177e4SLinus Torvalds 908dc97618dSJ. Bruce Fields static __be32 909dc97618dSJ. Bruce Fields nfsd_vfs_read(struct svc_rqst *rqstp, struct file *file, 910dc97618dSJ. Bruce Fields loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 911dc97618dSJ. Bruce Fields { 912779fb0f3SJeff Layton if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &rqstp->rq_flags)) 913dc97618dSJ. Bruce Fields return nfsd_splice_read(rqstp, file, offset, count); 914dc97618dSJ. Bruce Fields else 915dc97618dSJ. Bruce Fields return nfsd_readv(file, offset, vec, vlen, count); 9161da177e4SLinus Torvalds } 9171da177e4SLinus Torvalds 918d911df7bSJ. Bruce Fields /* 919d911df7bSJ. Bruce Fields * Gathered writes: If another process is currently writing to the file, 920d911df7bSJ. Bruce Fields * there's a high chance this is another nfsd (triggered by a bulk write 921d911df7bSJ. Bruce Fields * from a client's biod). Rather than syncing the file with each write 922d911df7bSJ. Bruce Fields * request, we sleep for 10 msec. 923d911df7bSJ. Bruce Fields * 924d911df7bSJ. Bruce Fields * I don't know if this roughly approximates C. Juszak's idea of 925d911df7bSJ. Bruce Fields * gathered writes, but it's a nice and simple solution (IMHO), and it 926d911df7bSJ. Bruce Fields * seems to work:-) 927d911df7bSJ. Bruce Fields * 928d911df7bSJ. Bruce Fields * Note: we do this only in the NFSv2 case, since v3 and higher have a 929d911df7bSJ. Bruce Fields * better tool (separate unstable writes and commits) for solving this 930d911df7bSJ. Bruce Fields * problem. 931d911df7bSJ. Bruce Fields */ 932d911df7bSJ. Bruce Fields static int wait_for_concurrent_writes(struct file *file) 933d911df7bSJ. Bruce Fields { 934496ad9aaSAl Viro struct inode *inode = file_inode(file); 935d911df7bSJ. Bruce Fields static ino_t last_ino; 936d911df7bSJ. Bruce Fields static dev_t last_dev; 937d911df7bSJ. Bruce Fields int err = 0; 938d911df7bSJ. Bruce Fields 939d911df7bSJ. Bruce Fields if (atomic_read(&inode->i_writecount) > 1 940d911df7bSJ. Bruce Fields || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 941d911df7bSJ. Bruce Fields dprintk("nfsd: write defer %d\n", task_pid_nr(current)); 942d911df7bSJ. Bruce Fields msleep(10); 943d911df7bSJ. Bruce Fields dprintk("nfsd: write resume %d\n", task_pid_nr(current)); 944d911df7bSJ. Bruce Fields } 945d911df7bSJ. Bruce Fields 946d911df7bSJ. Bruce Fields if (inode->i_state & I_DIRTY) { 947d911df7bSJ. Bruce Fields dprintk("nfsd: write sync %d\n", task_pid_nr(current)); 9488018ab05SChristoph Hellwig err = vfs_fsync(file, 0); 949d911df7bSJ. Bruce Fields } 950d911df7bSJ. Bruce Fields last_ino = inode->i_ino; 951d911df7bSJ. Bruce Fields last_dev = inode->i_sb->s_dev; 952d911df7bSJ. Bruce Fields return err; 953d911df7bSJ. Bruce Fields } 954d911df7bSJ. Bruce Fields 955af90f707SChristoph Hellwig __be32 9561da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 9571da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 95854bbb7d2SKinglong Mee unsigned long *cnt, int stable) 9591da177e4SLinus Torvalds { 9601da177e4SLinus Torvalds struct svc_export *exp; 9611da177e4SLinus Torvalds mm_segment_t oldfs; 9626264d69dSAl Viro __be32 err = 0; 9636264d69dSAl Viro int host_err; 96448e03bc5STrond Myklebust int use_wgather; 965e49dbbf3SKent Overstreet loff_t pos = offset; 9668658452eSNeilBrown unsigned int pflags = current->flags; 96724368aadSChristoph Hellwig int flags = 0; 9688658452eSNeilBrown 9697501cc2bSJeff Layton if (test_bit(RQ_LOCAL, &rqstp->rq_flags)) 9708658452eSNeilBrown /* 9718658452eSNeilBrown * We want less throttling in balance_dirty_pages() 9728658452eSNeilBrown * and shrink_inactive_list() so that nfs to 9738658452eSNeilBrown * localhost doesn't cause nfsd to lock up due to all 9748658452eSNeilBrown * the client's dirty pages or its congested queue. 9758658452eSNeilBrown */ 9768658452eSNeilBrown current->flags |= PF_LESS_THROTTLE; 9771da177e4SLinus Torvalds 9781da177e4SLinus Torvalds exp = fhp->fh_export; 97948e03bc5STrond Myklebust use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); 9801da177e4SLinus Torvalds 9811da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 98254bbb7d2SKinglong Mee stable = NFS_UNSTABLE; 9831da177e4SLinus Torvalds 98424368aadSChristoph Hellwig if (stable && !use_wgather) 98524368aadSChristoph Hellwig flags |= RWF_SYNC; 98624368aadSChristoph Hellwig 9871da177e4SLinus Torvalds /* Write the data. */ 9881da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 98924368aadSChristoph Hellwig host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &pos, flags); 9901da177e4SLinus Torvalds set_fs(oldfs); 991e4636d53SJ. Bruce Fields if (host_err < 0) 992e4636d53SJ. Bruce Fields goto out_nfserr; 993a0d24b29SWei Yongjun *cnt = host_err; 99431dec253SDavid Shaw nfsdstats.io_write += host_err; 9952a12a9d7SEric Paris fsnotify_modify(file); 9961da177e4SLinus Torvalds 99724368aadSChristoph Hellwig if (stable && use_wgather) 998d911df7bSJ. Bruce Fields host_err = wait_for_concurrent_writes(file); 9991da177e4SLinus Torvalds 1000e4636d53SJ. Bruce Fields out_nfserr: 10016264d69dSAl Viro dprintk("nfsd: write complete host_err=%d\n", host_err); 1002a0d24b29SWei Yongjun if (host_err >= 0) 10031da177e4SLinus Torvalds err = 0; 1004a0d24b29SWei Yongjun else 10056264d69dSAl Viro err = nfserrno(host_err); 10067501cc2bSJeff Layton if (test_bit(RQ_LOCAL, &rqstp->rq_flags)) 10078658452eSNeilBrown tsk_restore_flags(current, pflags, PF_LESS_THROTTLE); 10081da177e4SLinus Torvalds return err; 10091da177e4SLinus Torvalds } 10101da177e4SLinus Torvalds 1011dc97618dSJ. Bruce Fields /* 1012dc97618dSJ. Bruce Fields * Read data from a file. count must contain the requested read count 1013dc97618dSJ. Bruce Fields * on entry. On return, *count contains the number of bytes actually read. 1014dc97618dSJ. Bruce Fields * N.B. After this call fhp needs an fh_put 1015dc97618dSJ. Bruce Fields */ 1016dc97618dSJ. Bruce Fields __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, 1017dc97618dSJ. Bruce Fields loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 1018dc97618dSJ. Bruce Fields { 1019dc97618dSJ. Bruce Fields struct file *file; 1020dc97618dSJ. Bruce Fields struct raparms *ra; 1021dc97618dSJ. Bruce Fields __be32 err; 1022dc97618dSJ. Bruce Fields 10236e8b50d1SJeff Layton trace_read_start(rqstp, fhp, offset, vlen); 1024e749a462SChristoph Hellwig err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 1025dc97618dSJ. Bruce Fields if (err) 1026dc97618dSJ. Bruce Fields return err; 1027dc97618dSJ. Bruce Fields 1028e749a462SChristoph Hellwig ra = nfsd_init_raparms(file); 10296e8b50d1SJeff Layton 10306e8b50d1SJeff Layton trace_read_opened(rqstp, fhp, offset, vlen); 1031dc97618dSJ. Bruce Fields err = nfsd_vfs_read(rqstp, file, offset, vec, vlen, count); 10326e8b50d1SJeff Layton trace_read_io_done(rqstp, fhp, offset, vlen); 10336e8b50d1SJeff Layton 1034e749a462SChristoph Hellwig if (ra) 1035e749a462SChristoph Hellwig nfsd_put_raparams(file, ra); 1036e749a462SChristoph Hellwig fput(file); 1037dc97618dSJ. Bruce Fields 10386e8b50d1SJeff Layton trace_read_done(rqstp, fhp, offset, vlen); 10396e8b50d1SJeff Layton 1040fa0a2126SJ. Bruce Fields return err; 1041fa0a2126SJ. Bruce Fields } 1042fa0a2126SJ. Bruce Fields 10431da177e4SLinus Torvalds /* 10441da177e4SLinus Torvalds * Write data to a file. 10451da177e4SLinus Torvalds * The stable flag requests synchronous writes. 10461da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10471da177e4SLinus Torvalds */ 10486264d69dSAl Viro __be32 104952e380e0SKinglong Mee nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t offset, 105052e380e0SKinglong Mee struct kvec *vec, int vlen, unsigned long *cnt, int stable) 10511da177e4SLinus Torvalds { 105252e380e0SKinglong Mee struct file *file = NULL; 10536264d69dSAl Viro __be32 err = 0; 10541da177e4SLinus Torvalds 10556e8b50d1SJeff Layton trace_write_start(rqstp, fhp, offset, vlen); 10566e8b50d1SJeff Layton 10578837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 10581da177e4SLinus Torvalds if (err) 10591da177e4SLinus Torvalds goto out; 10601da177e4SLinus Torvalds 10616e8b50d1SJeff Layton trace_write_opened(rqstp, fhp, offset, vlen); 106252e380e0SKinglong Mee err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, stable); 10636e8b50d1SJeff Layton trace_write_io_done(rqstp, fhp, offset, vlen); 1064fd891454SChristoph Hellwig fput(file); 10651da177e4SLinus Torvalds out: 10666e8b50d1SJeff Layton trace_write_done(rqstp, fhp, offset, vlen); 10671da177e4SLinus Torvalds return err; 10681da177e4SLinus Torvalds } 10691da177e4SLinus Torvalds 10701da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 10711da177e4SLinus Torvalds /* 10721da177e4SLinus Torvalds * Commit all pending writes to stable storage. 1073aa696a6fSTrond Myklebust * 1074aa696a6fSTrond Myklebust * Note: we only guarantee that data that lies within the range specified 1075aa696a6fSTrond Myklebust * by the 'offset' and 'count' parameters will be synced. 10761da177e4SLinus Torvalds * 10771da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 10781da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 10791da177e4SLinus Torvalds */ 10806264d69dSAl Viro __be32 10811da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 10821da177e4SLinus Torvalds loff_t offset, unsigned long count) 10831da177e4SLinus Torvalds { 10841da177e4SLinus Torvalds struct file *file; 1085aa696a6fSTrond Myklebust loff_t end = LLONG_MAX; 1086aa696a6fSTrond Myklebust __be32 err = nfserr_inval; 10871da177e4SLinus Torvalds 1088aa696a6fSTrond Myklebust if (offset < 0) 1089aa696a6fSTrond Myklebust goto out; 1090aa696a6fSTrond Myklebust if (count != 0) { 1091aa696a6fSTrond Myklebust end = offset + (loff_t)count - 1; 1092aa696a6fSTrond Myklebust if (end < offset) 1093aa696a6fSTrond Myklebust goto out; 1094aa696a6fSTrond Myklebust } 10951da177e4SLinus Torvalds 109691885258SJeff Layton err = nfsd_open(rqstp, fhp, S_IFREG, 109791885258SJeff Layton NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file); 10988837abcaSMiklos Szeredi if (err) 1099aa696a6fSTrond Myklebust goto out; 11001da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 11018018ab05SChristoph Hellwig int err2 = vfs_fsync_range(file, offset, end, 0); 1102aa696a6fSTrond Myklebust 1103aa696a6fSTrond Myklebust if (err2 != -EINVAL) 1104aa696a6fSTrond Myklebust err = nfserrno(err2); 1105aa696a6fSTrond Myklebust else 11061da177e4SLinus Torvalds err = nfserr_notsupp; 11071da177e4SLinus Torvalds } 11081da177e4SLinus Torvalds 1109fd891454SChristoph Hellwig fput(file); 1110aa696a6fSTrond Myklebust out: 11111da177e4SLinus Torvalds return err; 11121da177e4SLinus Torvalds } 11131da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 11141da177e4SLinus Torvalds 1115f2b0dee2SAdrian Bunk static __be32 11165c002b3bSJ. Bruce Fields nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, 11175c002b3bSJ. Bruce Fields struct iattr *iap) 11185c002b3bSJ. Bruce Fields { 11195c002b3bSJ. Bruce Fields /* 11205c002b3bSJ. Bruce Fields * Mode has already been set earlier in create: 11215c002b3bSJ. Bruce Fields */ 11225c002b3bSJ. Bruce Fields iap->ia_valid &= ~ATTR_MODE; 11235c002b3bSJ. Bruce Fields /* 11245c002b3bSJ. Bruce Fields * Setting uid/gid works only for root. Irix appears to 11255c002b3bSJ. Bruce Fields * send along the gid on create when it tries to implement 11265c002b3bSJ. Bruce Fields * setgid directories via NFS: 11275c002b3bSJ. Bruce Fields */ 11286fab8779SEric W. Biederman if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) 11295c002b3bSJ. Bruce Fields iap->ia_valid &= ~(ATTR_UID|ATTR_GID); 11305c002b3bSJ. Bruce Fields if (iap->ia_valid) 11315c002b3bSJ. Bruce Fields return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 11320f3a24b4STrond Myklebust /* Callers expect file metadata to be committed here */ 1133722b620dSJeff Layton return nfserrno(commit_metadata(resfhp)); 11345c002b3bSJ. Bruce Fields } 11355c002b3bSJ. Bruce Fields 11364ac35c2fSwengang wang /* HPUX client sometimes creates a file in mode 000, and sets size to 0. 11374ac35c2fSwengang wang * setting size to 0 may fail for some specific file systems by the permission 11384ac35c2fSwengang wang * checking which requires WRITE permission but the mode is 000. 11394ac35c2fSwengang wang * we ignore the resizing(to 0) on the just new created file, since the size is 11404ac35c2fSwengang wang * 0 after file created. 11414ac35c2fSwengang wang * 11424ac35c2fSwengang wang * call this only after vfs_create() is called. 11434ac35c2fSwengang wang * */ 11444ac35c2fSwengang wang static void 11454ac35c2fSwengang wang nfsd_check_ignore_resizing(struct iattr *iap) 11464ac35c2fSwengang wang { 11474ac35c2fSwengang wang if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) 11484ac35c2fSwengang wang iap->ia_valid &= ~ATTR_SIZE; 11494ac35c2fSwengang wang } 11504ac35c2fSwengang wang 1151b44061d0SJ. Bruce Fields /* The parent directory should already be locked: */ 11526264d69dSAl Viro __be32 1153b44061d0SJ. Bruce Fields nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp, 11541da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 11551da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 11561da177e4SLinus Torvalds { 11572b118859SDan Carpenter struct dentry *dentry, *dchild; 11581da177e4SLinus Torvalds struct inode *dirp; 11596264d69dSAl Viro __be32 err; 11605c002b3bSJ. Bruce Fields __be32 err2; 11616264d69dSAl Viro int host_err; 11621da177e4SLinus Torvalds 11631da177e4SLinus Torvalds dentry = fhp->fh_dentry; 11642b0143b5SDavid Howells dirp = d_inode(dentry); 11651da177e4SLinus Torvalds 11661da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 11671da177e4SLinus Torvalds if (!fhp->fh_locked) { 1168b44061d0SJ. Bruce Fields WARN_ONCE(1, "nfsd_create: parent %pd2 not locked!\n", 1169a6a9f18fSAl Viro dentry); 1170d75f2b9fSAl Viro err = nfserr_io; 11711da177e4SLinus Torvalds goto out; 11721da177e4SLinus Torvalds } 11731da177e4SLinus Torvalds 11747eed34f1SOleg Drokin err = nfsd_permission(rqstp, fhp->fh_export, dentry, NFSD_MAY_CREATE); 11757eed34f1SOleg Drokin if (err) 11767eed34f1SOleg Drokin goto out; 11777eed34f1SOleg Drokin 11781da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 11791da177e4SLinus Torvalds iap->ia_mode = 0; 11801da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 11811da177e4SLinus Torvalds 1182088406bcSJ. Bruce Fields err = 0; 11834a55c101SJan Kara host_err = 0; 11841da177e4SLinus Torvalds switch (type) { 11851da177e4SLinus Torvalds case S_IFREG: 1186312b63fbSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, true); 11874ac35c2fSwengang wang if (!host_err) 11884ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 11891da177e4SLinus Torvalds break; 11901da177e4SLinus Torvalds case S_IFDIR: 11916264d69dSAl Viro host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); 11921da177e4SLinus Torvalds break; 11931da177e4SLinus Torvalds case S_IFCHR: 11941da177e4SLinus Torvalds case S_IFBLK: 11951da177e4SLinus Torvalds case S_IFIFO: 11961da177e4SLinus Torvalds case S_IFSOCK: 11976264d69dSAl Viro host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 11981da177e4SLinus Torvalds break; 119971423274SJ. Bruce Fields default: 120071423274SJ. Bruce Fields printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", 120171423274SJ. Bruce Fields type); 120271423274SJ. Bruce Fields host_err = -EINVAL; 1203463c3197SDave Hansen } 12044a55c101SJan Kara if (host_err < 0) 1205463c3197SDave Hansen goto out_nfserr; 12061da177e4SLinus Torvalds 1207f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 12081da177e4SLinus Torvalds 1209f501912aSBen Myers /* 12100f3a24b4STrond Myklebust * nfsd_create_setattr already committed the child. Transactional 12110f3a24b4STrond Myklebust * filesystems had a chance to commit changes for both parent and 1212b44061d0SJ. Bruce Fields * child simultaneously making the following commit_metadata a 12130f3a24b4STrond Myklebust * noop. 1214f501912aSBen Myers */ 1215f501912aSBen Myers err2 = nfserrno(commit_metadata(fhp)); 1216f193fbabSYAMAMOTO Takashi if (err2) 1217f193fbabSYAMAMOTO Takashi err = err2; 12181da177e4SLinus Torvalds /* 12191da177e4SLinus Torvalds * Update the file handle to get the new inode info. 12201da177e4SLinus Torvalds */ 12211da177e4SLinus Torvalds if (!err) 12221da177e4SLinus Torvalds err = fh_update(resfhp); 12231da177e4SLinus Torvalds out: 12241da177e4SLinus Torvalds dput(dchild); 12251da177e4SLinus Torvalds return err; 12261da177e4SLinus Torvalds 12271da177e4SLinus Torvalds out_nfserr: 12286264d69dSAl Viro err = nfserrno(host_err); 12291da177e4SLinus Torvalds goto out; 12301da177e4SLinus Torvalds } 12311da177e4SLinus Torvalds 1232b44061d0SJ. Bruce Fields /* 1233b44061d0SJ. Bruce Fields * Create a filesystem object (regular, directory, special). 1234b44061d0SJ. Bruce Fields * Note that the parent directory is left locked. 1235b44061d0SJ. Bruce Fields * 1236b44061d0SJ. Bruce Fields * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 1237b44061d0SJ. Bruce Fields */ 1238b44061d0SJ. Bruce Fields __be32 1239b44061d0SJ. Bruce Fields nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 1240b44061d0SJ. Bruce Fields char *fname, int flen, struct iattr *iap, 1241b44061d0SJ. Bruce Fields int type, dev_t rdev, struct svc_fh *resfhp) 1242b44061d0SJ. Bruce Fields { 1243b44061d0SJ. Bruce Fields struct dentry *dentry, *dchild = NULL; 1244b44061d0SJ. Bruce Fields struct inode *dirp; 1245b44061d0SJ. Bruce Fields __be32 err; 1246b44061d0SJ. Bruce Fields int host_err; 1247b44061d0SJ. Bruce Fields 1248b44061d0SJ. Bruce Fields if (isdotent(fname, flen)) 1249b44061d0SJ. Bruce Fields return nfserr_exist; 1250b44061d0SJ. Bruce Fields 1251fa08139dSJ. Bruce Fields err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_NOP); 1252b44061d0SJ. Bruce Fields if (err) 1253b44061d0SJ. Bruce Fields return err; 1254b44061d0SJ. Bruce Fields 1255b44061d0SJ. Bruce Fields dentry = fhp->fh_dentry; 1256b44061d0SJ. Bruce Fields dirp = d_inode(dentry); 1257b44061d0SJ. Bruce Fields 1258b44061d0SJ. Bruce Fields host_err = fh_want_write(fhp); 1259b44061d0SJ. Bruce Fields if (host_err) 1260b44061d0SJ. Bruce Fields return nfserrno(host_err); 1261b44061d0SJ. Bruce Fields 1262b44061d0SJ. Bruce Fields fh_lock_nested(fhp, I_MUTEX_PARENT); 1263b44061d0SJ. Bruce Fields dchild = lookup_one_len(fname, dentry, flen); 1264b44061d0SJ. Bruce Fields host_err = PTR_ERR(dchild); 1265b44061d0SJ. Bruce Fields if (IS_ERR(dchild)) 1266b44061d0SJ. Bruce Fields return nfserrno(host_err); 1267b44061d0SJ. Bruce Fields err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 1268502aa0a5SJosef Bacik /* 1269502aa0a5SJosef Bacik * We unconditionally drop our ref to dchild as fh_compose will have 1270502aa0a5SJosef Bacik * already grabbed its own ref for it. 1271502aa0a5SJosef Bacik */ 1272b44061d0SJ. Bruce Fields dput(dchild); 1273502aa0a5SJosef Bacik if (err) 1274b44061d0SJ. Bruce Fields return err; 1275b44061d0SJ. Bruce Fields return nfsd_create_locked(rqstp, fhp, fname, flen, iap, type, 1276b44061d0SJ. Bruce Fields rdev, resfhp); 1277b44061d0SJ. Bruce Fields } 1278b44061d0SJ. Bruce Fields 12791da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 1280ac6721a1SMi Jinlong 12811da177e4SLinus Torvalds /* 1282ac6721a1SMi Jinlong * NFSv3 and NFSv4 version of nfsd_create 12831da177e4SLinus Torvalds */ 12846264d69dSAl Viro __be32 1285ac6721a1SMi Jinlong do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 12861da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 12871da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 1288856121b2SJ. Bruce Fields bool *truncp, bool *created) 12891da177e4SLinus Torvalds { 12901da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 12911da177e4SLinus Torvalds struct inode *dirp; 12926264d69dSAl Viro __be32 err; 12936264d69dSAl Viro int host_err; 12941da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 12951da177e4SLinus Torvalds 12961da177e4SLinus Torvalds err = nfserr_perm; 12971da177e4SLinus Torvalds if (!flen) 12981da177e4SLinus Torvalds goto out; 12991da177e4SLinus Torvalds err = nfserr_exist; 13001da177e4SLinus Torvalds if (isdotent(fname, flen)) 13011da177e4SLinus Torvalds goto out; 13021da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 13031da177e4SLinus Torvalds iap->ia_mode = 0; 13041574dff8SSachin Prabhu err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 13051da177e4SLinus Torvalds if (err) 13061da177e4SLinus Torvalds goto out; 13071da177e4SLinus Torvalds 13081da177e4SLinus Torvalds dentry = fhp->fh_dentry; 13092b0143b5SDavid Howells dirp = d_inode(dentry); 13101da177e4SLinus Torvalds 13114a55c101SJan Kara host_err = fh_want_write(fhp); 13124a55c101SJan Kara if (host_err) 13134a55c101SJan Kara goto out_nfserr; 13144a55c101SJan Kara 131512fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 13161da177e4SLinus Torvalds 13171da177e4SLinus Torvalds /* 13181da177e4SLinus Torvalds * Compose the response file handle. 13191da177e4SLinus Torvalds */ 13201da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 13216264d69dSAl Viro host_err = PTR_ERR(dchild); 13221da177e4SLinus Torvalds if (IS_ERR(dchild)) 13231da177e4SLinus Torvalds goto out_nfserr; 13241da177e4SLinus Torvalds 13251574dff8SSachin Prabhu /* If file doesn't exist, check for permissions to create one */ 13262b0143b5SDavid Howells if (d_really_is_negative(dchild)) { 13271574dff8SSachin Prabhu err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 13281574dff8SSachin Prabhu if (err) 13291574dff8SSachin Prabhu goto out; 13301574dff8SSachin Prabhu } 13311574dff8SSachin Prabhu 13321da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 13331da177e4SLinus Torvalds if (err) 13341da177e4SLinus Torvalds goto out; 13351da177e4SLinus Torvalds 1336ac6721a1SMi Jinlong if (nfsd_create_is_exclusive(createmode)) { 1337c397852cSPeter Staubach /* solaris7 gets confused (bugid 4218508) if these have 1338749997e5SJeff Layton * the high bit set, so just clear the high bits. If this is 1339749997e5SJeff Layton * ever changed to use different attrs for storing the 1340749997e5SJeff Layton * verifier, then do_open_lookup() will also need to be fixed 1341749997e5SJeff Layton * accordingly. 13421da177e4SLinus Torvalds */ 13431da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 13441da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 13451da177e4SLinus Torvalds } 13461da177e4SLinus Torvalds 13472b0143b5SDavid Howells if (d_really_is_positive(dchild)) { 13481da177e4SLinus Torvalds err = 0; 13491da177e4SLinus Torvalds 13501da177e4SLinus Torvalds switch (createmode) { 13511da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 1352e36cb0b8SDavid Howells if (! d_is_reg(dchild)) 13539dc4e6c4SJ. Bruce Fields goto out; 13541da177e4SLinus Torvalds else if (truncp) { 13551da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 13561da177e4SLinus Torvalds * differently. we don't want to truncate the 13571da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 13581da177e4SLinus Torvalds * fails for some other reason. furthermore, 13591da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 13601da177e4SLinus Torvalds * according to spec! 13611da177e4SLinus Torvalds */ 13621da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 13631da177e4SLinus Torvalds } 13641da177e4SLinus Torvalds else { 13651da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 13661da177e4SLinus Torvalds goto set_attr; 13671da177e4SLinus Torvalds } 13681da177e4SLinus Torvalds break; 13691da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 13702b0143b5SDavid Howells if ( d_inode(dchild)->i_mtime.tv_sec == v_mtime 13712b0143b5SDavid Howells && d_inode(dchild)->i_atime.tv_sec == v_atime 13722b0143b5SDavid Howells && d_inode(dchild)->i_size == 0 ) { 13737007c90fSNeil Brown if (created) 13747007c90fSNeil Brown *created = 1; 13751da177e4SLinus Torvalds break; 13767007c90fSNeil Brown } 1377ac6721a1SMi Jinlong case NFS4_CREATE_EXCLUSIVE4_1: 13782b0143b5SDavid Howells if ( d_inode(dchild)->i_mtime.tv_sec == v_mtime 13792b0143b5SDavid Howells && d_inode(dchild)->i_atime.tv_sec == v_atime 13802b0143b5SDavid Howells && d_inode(dchild)->i_size == 0 ) { 13817007c90fSNeil Brown if (created) 13827007c90fSNeil Brown *created = 1; 1383ac6721a1SMi Jinlong goto set_attr; 13847007c90fSNeil Brown } 13851da177e4SLinus Torvalds /* fallthru */ 13861da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 13871da177e4SLinus Torvalds err = nfserr_exist; 13881da177e4SLinus Torvalds } 1389bad0dcffSAl Viro fh_drop_write(fhp); 13901da177e4SLinus Torvalds goto out; 13911da177e4SLinus Torvalds } 13921da177e4SLinus Torvalds 1393312b63fbSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, true); 1394463c3197SDave Hansen if (host_err < 0) { 1395bad0dcffSAl Viro fh_drop_write(fhp); 13961da177e4SLinus Torvalds goto out_nfserr; 1397463c3197SDave Hansen } 139881ac95c5SJ. Bruce Fields if (created) 139981ac95c5SJ. Bruce Fields *created = 1; 14001da177e4SLinus Torvalds 14014ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 14024ac35c2fSwengang wang 1403ac6721a1SMi Jinlong if (nfsd_create_is_exclusive(createmode)) { 1404c397852cSPeter Staubach /* Cram the verifier into atime/mtime */ 14051da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 1406c397852cSPeter Staubach | ATTR_MTIME_SET|ATTR_ATIME_SET; 14071da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 14081da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 14091da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 14101da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 14111da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 14121da177e4SLinus Torvalds } 14131da177e4SLinus Torvalds 14141da177e4SLinus Torvalds set_attr: 1415f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 1416f501912aSBen Myers 1417f501912aSBen Myers /* 14180f3a24b4STrond Myklebust * nfsd_create_setattr already committed the child 14190f3a24b4STrond Myklebust * (and possibly also the parent). 1420f501912aSBen Myers */ 1421f501912aSBen Myers if (!err) 1422f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 1423f193fbabSYAMAMOTO Takashi 1424f193fbabSYAMAMOTO Takashi /* 1425f193fbabSYAMAMOTO Takashi * Update the filehandle to get the new inode info. 1426f193fbabSYAMAMOTO Takashi */ 1427f193fbabSYAMAMOTO Takashi if (!err) 1428f193fbabSYAMAMOTO Takashi err = fh_update(resfhp); 14291da177e4SLinus Torvalds 14301da177e4SLinus Torvalds out: 14311da177e4SLinus Torvalds fh_unlock(fhp); 14321da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 14331da177e4SLinus Torvalds dput(dchild); 14344a55c101SJan Kara fh_drop_write(fhp); 14351da177e4SLinus Torvalds return err; 14361da177e4SLinus Torvalds 14371da177e4SLinus Torvalds out_nfserr: 14386264d69dSAl Viro err = nfserrno(host_err); 14391da177e4SLinus Torvalds goto out; 14401da177e4SLinus Torvalds } 14411da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 14421da177e4SLinus Torvalds 14431da177e4SLinus Torvalds /* 14441da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 14451da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 14461da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 14471da177e4SLinus Torvalds */ 14486264d69dSAl Viro __be32 14491da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 14501da177e4SLinus Torvalds { 14511da177e4SLinus Torvalds mm_segment_t oldfs; 14526264d69dSAl Viro __be32 err; 14536264d69dSAl Viro int host_err; 145468ac1234SAl Viro struct path path; 14551da177e4SLinus Torvalds 14568837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); 14571da177e4SLinus Torvalds if (err) 14581da177e4SLinus Torvalds goto out; 14591da177e4SLinus Torvalds 146068ac1234SAl Viro path.mnt = fhp->fh_export->ex_path.mnt; 146168ac1234SAl Viro path.dentry = fhp->fh_dentry; 14621da177e4SLinus Torvalds 14631da177e4SLinus Torvalds err = nfserr_inval; 1464fd4a0edfSMiklos Szeredi if (!d_is_symlink(path.dentry)) 14651da177e4SLinus Torvalds goto out; 14661da177e4SLinus Torvalds 146768ac1234SAl Viro touch_atime(&path); 14681da177e4SLinus Torvalds /* N.B. Why does this call need a get_fs()?? 14691da177e4SLinus Torvalds * Remove the set_fs and watch the fireworks:-) --okir 14701da177e4SLinus Torvalds */ 14711da177e4SLinus Torvalds 14721da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 1473fd4a0edfSMiklos Szeredi host_err = vfs_readlink(path.dentry, (char __user *)buf, *lenp); 14741da177e4SLinus Torvalds set_fs(oldfs); 14751da177e4SLinus Torvalds 14766264d69dSAl Viro if (host_err < 0) 14771da177e4SLinus Torvalds goto out_nfserr; 14786264d69dSAl Viro *lenp = host_err; 14791da177e4SLinus Torvalds err = 0; 14801da177e4SLinus Torvalds out: 14811da177e4SLinus Torvalds return err; 14821da177e4SLinus Torvalds 14831da177e4SLinus Torvalds out_nfserr: 14846264d69dSAl Viro err = nfserrno(host_err); 14851da177e4SLinus Torvalds goto out; 14861da177e4SLinus Torvalds } 14871da177e4SLinus Torvalds 14881da177e4SLinus Torvalds /* 14891da177e4SLinus Torvalds * Create a symlink and look up its inode 14901da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 14911da177e4SLinus Torvalds */ 14926264d69dSAl Viro __be32 14931da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 14941da177e4SLinus Torvalds char *fname, int flen, 149552ee0433SJ. Bruce Fields char *path, 14961e444f5bSKinglong Mee struct svc_fh *resfhp) 14971da177e4SLinus Torvalds { 14981da177e4SLinus Torvalds struct dentry *dentry, *dnew; 14996264d69dSAl Viro __be32 err, cerr; 15006264d69dSAl Viro int host_err; 15011da177e4SLinus Torvalds 15021da177e4SLinus Torvalds err = nfserr_noent; 150352ee0433SJ. Bruce Fields if (!flen || path[0] == '\0') 15041da177e4SLinus Torvalds goto out; 15051da177e4SLinus Torvalds err = nfserr_exist; 15061da177e4SLinus Torvalds if (isdotent(fname, flen)) 15071da177e4SLinus Torvalds goto out; 15081da177e4SLinus Torvalds 15098837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 15101da177e4SLinus Torvalds if (err) 15111da177e4SLinus Torvalds goto out; 15124a55c101SJan Kara 15134a55c101SJan Kara host_err = fh_want_write(fhp); 15144a55c101SJan Kara if (host_err) 15154a55c101SJan Kara goto out_nfserr; 15164a55c101SJan Kara 15171da177e4SLinus Torvalds fh_lock(fhp); 15181da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15191da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 15206264d69dSAl Viro host_err = PTR_ERR(dnew); 15211da177e4SLinus Torvalds if (IS_ERR(dnew)) 15221da177e4SLinus Torvalds goto out_nfserr; 15231da177e4SLinus Torvalds 15242b0143b5SDavid Howells host_err = vfs_symlink(d_inode(dentry), dnew, path); 15256264d69dSAl Viro err = nfserrno(host_err); 1526f501912aSBen Myers if (!err) 1527f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 15281da177e4SLinus Torvalds fh_unlock(fhp); 15291da177e4SLinus Torvalds 1530bad0dcffSAl Viro fh_drop_write(fhp); 153175c3f29dSDave Hansen 15321da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 15331da177e4SLinus Torvalds dput(dnew); 15341da177e4SLinus Torvalds if (err==0) err = cerr; 15351da177e4SLinus Torvalds out: 15361da177e4SLinus Torvalds return err; 15371da177e4SLinus Torvalds 15381da177e4SLinus Torvalds out_nfserr: 15396264d69dSAl Viro err = nfserrno(host_err); 15401da177e4SLinus Torvalds goto out; 15411da177e4SLinus Torvalds } 15421da177e4SLinus Torvalds 15431da177e4SLinus Torvalds /* 15441da177e4SLinus Torvalds * Create a hardlink 15451da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 15461da177e4SLinus Torvalds */ 15476264d69dSAl Viro __be32 15481da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 15491da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 15501da177e4SLinus Torvalds { 15511da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 155255b13354SJ. Bruce Fields struct inode *dirp; 15536264d69dSAl Viro __be32 err; 15546264d69dSAl Viro int host_err; 15551da177e4SLinus Torvalds 15568837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); 15571da177e4SLinus Torvalds if (err) 15581da177e4SLinus Torvalds goto out; 15597d818a7bSJ. Bruce Fields err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); 15601da177e4SLinus Torvalds if (err) 15611da177e4SLinus Torvalds goto out; 15627d818a7bSJ. Bruce Fields err = nfserr_isdir; 1563e36cb0b8SDavid Howells if (d_is_dir(tfhp->fh_dentry)) 15647d818a7bSJ. Bruce Fields goto out; 15651da177e4SLinus Torvalds err = nfserr_perm; 15661da177e4SLinus Torvalds if (!len) 15671da177e4SLinus Torvalds goto out; 15681da177e4SLinus Torvalds err = nfserr_exist; 15691da177e4SLinus Torvalds if (isdotent(name, len)) 15701da177e4SLinus Torvalds goto out; 15711da177e4SLinus Torvalds 15724a55c101SJan Kara host_err = fh_want_write(tfhp); 15734a55c101SJan Kara if (host_err) { 15744a55c101SJan Kara err = nfserrno(host_err); 15754a55c101SJan Kara goto out; 15764a55c101SJan Kara } 15774a55c101SJan Kara 157812fd3520SPeter Zijlstra fh_lock_nested(ffhp, I_MUTEX_PARENT); 15791da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 15802b0143b5SDavid Howells dirp = d_inode(ddir); 15811da177e4SLinus Torvalds 15821da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 15836264d69dSAl Viro host_err = PTR_ERR(dnew); 15841da177e4SLinus Torvalds if (IS_ERR(dnew)) 15851da177e4SLinus Torvalds goto out_nfserr; 15861da177e4SLinus Torvalds 15871da177e4SLinus Torvalds dold = tfhp->fh_dentry; 15881da177e4SLinus Torvalds 15894795bb37SJ. Bruce Fields err = nfserr_noent; 15902b0143b5SDavid Howells if (d_really_is_negative(dold)) 15914a55c101SJan Kara goto out_dput; 1592146a8595SJ. Bruce Fields host_err = vfs_link(dold, dirp, dnew, NULL); 15936264d69dSAl Viro if (!host_err) { 1594f501912aSBen Myers err = nfserrno(commit_metadata(ffhp)); 1595f501912aSBen Myers if (!err) 1596f501912aSBen Myers err = nfserrno(commit_metadata(tfhp)); 15971da177e4SLinus Torvalds } else { 15986264d69dSAl Viro if (host_err == -EXDEV && rqstp->rq_vers == 2) 15991da177e4SLinus Torvalds err = nfserr_acces; 16001da177e4SLinus Torvalds else 16016264d69dSAl Viro err = nfserrno(host_err); 16021da177e4SLinus Torvalds } 160375c3f29dSDave Hansen out_dput: 16041da177e4SLinus Torvalds dput(dnew); 1605270d56e5SDavid M. Richter out_unlock: 1606270d56e5SDavid M. Richter fh_unlock(ffhp); 16074a55c101SJan Kara fh_drop_write(tfhp); 16081da177e4SLinus Torvalds out: 16091da177e4SLinus Torvalds return err; 16101da177e4SLinus Torvalds 16111da177e4SLinus Torvalds out_nfserr: 16126264d69dSAl Viro err = nfserrno(host_err); 1613270d56e5SDavid M. Richter goto out_unlock; 16141da177e4SLinus Torvalds } 16151da177e4SLinus Torvalds 16161da177e4SLinus Torvalds /* 16171da177e4SLinus Torvalds * Rename a file 16181da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16191da177e4SLinus Torvalds */ 16206264d69dSAl Viro __be32 16211da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 16221da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 16231da177e4SLinus Torvalds { 16241da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 16251da177e4SLinus Torvalds struct inode *fdir, *tdir; 16266264d69dSAl Viro __be32 err; 16276264d69dSAl Viro int host_err; 16281da177e4SLinus Torvalds 16298837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); 16301da177e4SLinus Torvalds if (err) 16311da177e4SLinus Torvalds goto out; 16328837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); 16331da177e4SLinus Torvalds if (err) 16341da177e4SLinus Torvalds goto out; 16351da177e4SLinus Torvalds 16361da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 16372b0143b5SDavid Howells fdir = d_inode(fdentry); 16381da177e4SLinus Torvalds 16391da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 16402b0143b5SDavid Howells tdir = d_inode(tdentry); 16411da177e4SLinus Torvalds 16421da177e4SLinus Torvalds err = nfserr_perm; 16431da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 16441da177e4SLinus Torvalds goto out; 16451da177e4SLinus Torvalds 16464a55c101SJan Kara host_err = fh_want_write(ffhp); 16474a55c101SJan Kara if (host_err) { 16484a55c101SJan Kara err = nfserrno(host_err); 16494a55c101SJan Kara goto out; 16504a55c101SJan Kara } 16514a55c101SJan Kara 16521da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 16531da177e4SLinus Torvalds * so do it by hand */ 16541da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 1655aaf91ec1SJeff Layton ffhp->fh_locked = tfhp->fh_locked = true; 16561da177e4SLinus Torvalds fill_pre_wcc(ffhp); 16571da177e4SLinus Torvalds fill_pre_wcc(tfhp); 16581da177e4SLinus Torvalds 16591da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 16606264d69dSAl Viro host_err = PTR_ERR(odentry); 16611da177e4SLinus Torvalds if (IS_ERR(odentry)) 16621da177e4SLinus Torvalds goto out_nfserr; 16631da177e4SLinus Torvalds 16646264d69dSAl Viro host_err = -ENOENT; 16652b0143b5SDavid Howells if (d_really_is_negative(odentry)) 16661da177e4SLinus Torvalds goto out_dput_old; 16676264d69dSAl Viro host_err = -EINVAL; 16681da177e4SLinus Torvalds if (odentry == trap) 16691da177e4SLinus Torvalds goto out_dput_old; 16701da177e4SLinus Torvalds 16711da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 16726264d69dSAl Viro host_err = PTR_ERR(ndentry); 16731da177e4SLinus Torvalds if (IS_ERR(ndentry)) 16741da177e4SLinus Torvalds goto out_dput_old; 16756264d69dSAl Viro host_err = -ENOTEMPTY; 16761da177e4SLinus Torvalds if (ndentry == trap) 16771da177e4SLinus Torvalds goto out_dput_new; 16781da177e4SLinus Torvalds 16799079b1ebSDave Hansen host_err = -EXDEV; 16809079b1ebSDave Hansen if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) 16819079b1ebSDave Hansen goto out_dput_new; 1682aa387d6cSJ. Bruce Fields if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry) 1683aa387d6cSJ. Bruce Fields goto out_dput_new; 16849079b1ebSDave Hansen 1685520c8b16SMiklos Szeredi host_err = vfs_rename(fdir, odentry, tdir, ndentry, NULL, 0); 1686f501912aSBen Myers if (!host_err) { 1687f501912aSBen Myers host_err = commit_metadata(tfhp); 16886264d69dSAl Viro if (!host_err) 1689f501912aSBen Myers host_err = commit_metadata(ffhp); 16901da177e4SLinus Torvalds } 16911da177e4SLinus Torvalds out_dput_new: 16921da177e4SLinus Torvalds dput(ndentry); 16931da177e4SLinus Torvalds out_dput_old: 16941da177e4SLinus Torvalds dput(odentry); 16951da177e4SLinus Torvalds out_nfserr: 16966264d69dSAl Viro err = nfserrno(host_err); 1697fbb74a34SJ. Bruce Fields /* 1698fbb74a34SJ. Bruce Fields * We cannot rely on fh_unlock on the two filehandles, 16991da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 1700fbb74a34SJ. Bruce Fields * were the same, so again we do it by hand. 17011da177e4SLinus Torvalds */ 17021da177e4SLinus Torvalds fill_post_wcc(ffhp); 17031da177e4SLinus Torvalds fill_post_wcc(tfhp); 17041da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 1705aaf91ec1SJeff Layton ffhp->fh_locked = tfhp->fh_locked = false; 17064a55c101SJan Kara fh_drop_write(ffhp); 17071da177e4SLinus Torvalds 17081da177e4SLinus Torvalds out: 17091da177e4SLinus Torvalds return err; 17101da177e4SLinus Torvalds } 17111da177e4SLinus Torvalds 17121da177e4SLinus Torvalds /* 17131da177e4SLinus Torvalds * Unlink a file or directory 17141da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 17151da177e4SLinus Torvalds */ 17166264d69dSAl Viro __be32 17171da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 17181da177e4SLinus Torvalds char *fname, int flen) 17191da177e4SLinus Torvalds { 17201da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 17211da177e4SLinus Torvalds struct inode *dirp; 17226264d69dSAl Viro __be32 err; 17236264d69dSAl Viro int host_err; 17241da177e4SLinus Torvalds 17251da177e4SLinus Torvalds err = nfserr_acces; 17261da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 17271da177e4SLinus Torvalds goto out; 17288837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); 17291da177e4SLinus Torvalds if (err) 17301da177e4SLinus Torvalds goto out; 17311da177e4SLinus Torvalds 17324a55c101SJan Kara host_err = fh_want_write(fhp); 17334a55c101SJan Kara if (host_err) 17344a55c101SJan Kara goto out_nfserr; 17354a55c101SJan Kara 173612fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 17371da177e4SLinus Torvalds dentry = fhp->fh_dentry; 17382b0143b5SDavid Howells dirp = d_inode(dentry); 17391da177e4SLinus Torvalds 17401da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 17416264d69dSAl Viro host_err = PTR_ERR(rdentry); 17421da177e4SLinus Torvalds if (IS_ERR(rdentry)) 17431da177e4SLinus Torvalds goto out_nfserr; 17441da177e4SLinus Torvalds 17452b0143b5SDavid Howells if (d_really_is_negative(rdentry)) { 17461da177e4SLinus Torvalds dput(rdentry); 17471da177e4SLinus Torvalds err = nfserr_noent; 17481da177e4SLinus Torvalds goto out; 17491da177e4SLinus Torvalds } 17501da177e4SLinus Torvalds 17511da177e4SLinus Torvalds if (!type) 17522b0143b5SDavid Howells type = d_inode(rdentry)->i_mode & S_IFMT; 17531da177e4SLinus Torvalds 17549ce137eeSJ. Bruce Fields if (type != S_IFDIR) 1755b21996e3SJ. Bruce Fields host_err = vfs_unlink(dirp, rdentry, NULL); 17569ce137eeSJ. Bruce Fields else 17576264d69dSAl Viro host_err = vfs_rmdir(dirp, rdentry); 1758541ce98cSJ. Bruce Fields if (!host_err) 1759541ce98cSJ. Bruce Fields host_err = commit_metadata(fhp); 17601da177e4SLinus Torvalds dput(rdentry); 17611da177e4SLinus Torvalds 17621da177e4SLinus Torvalds out_nfserr: 17636264d69dSAl Viro err = nfserrno(host_err); 1764f193fbabSYAMAMOTO Takashi out: 1765f193fbabSYAMAMOTO Takashi return err; 17661da177e4SLinus Torvalds } 17671da177e4SLinus Torvalds 17681da177e4SLinus Torvalds /* 176914f7dd63SDavid Woodhouse * We do this buffering because we must not call back into the file 177014f7dd63SDavid Woodhouse * system's ->lookup() method from the filldir callback. That may well 177114f7dd63SDavid Woodhouse * deadlock a number of file systems. 177214f7dd63SDavid Woodhouse * 177314f7dd63SDavid Woodhouse * This is based heavily on the implementation of same in XFS. 177414f7dd63SDavid Woodhouse */ 177514f7dd63SDavid Woodhouse struct buffered_dirent { 177614f7dd63SDavid Woodhouse u64 ino; 177714f7dd63SDavid Woodhouse loff_t offset; 177814f7dd63SDavid Woodhouse int namlen; 177914f7dd63SDavid Woodhouse unsigned int d_type; 178014f7dd63SDavid Woodhouse char name[]; 178114f7dd63SDavid Woodhouse }; 178214f7dd63SDavid Woodhouse 178314f7dd63SDavid Woodhouse struct readdir_data { 17845c0ba4e0SAl Viro struct dir_context ctx; 178514f7dd63SDavid Woodhouse char *dirent; 178614f7dd63SDavid Woodhouse size_t used; 178753c9c5c0SAl Viro int full; 178814f7dd63SDavid Woodhouse }; 178914f7dd63SDavid Woodhouse 1790ac7576f4SMiklos Szeredi static int nfsd_buffered_filldir(struct dir_context *ctx, const char *name, 1791ac7576f4SMiklos Szeredi int namlen, loff_t offset, u64 ino, 1792ac7576f4SMiklos Szeredi unsigned int d_type) 179314f7dd63SDavid Woodhouse { 1794ac7576f4SMiklos Szeredi struct readdir_data *buf = 1795ac7576f4SMiklos Szeredi container_of(ctx, struct readdir_data, ctx); 179614f7dd63SDavid Woodhouse struct buffered_dirent *de = (void *)(buf->dirent + buf->used); 179714f7dd63SDavid Woodhouse unsigned int reclen; 179814f7dd63SDavid Woodhouse 179914f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); 180053c9c5c0SAl Viro if (buf->used + reclen > PAGE_SIZE) { 180153c9c5c0SAl Viro buf->full = 1; 180214f7dd63SDavid Woodhouse return -EINVAL; 180353c9c5c0SAl Viro } 180414f7dd63SDavid Woodhouse 180514f7dd63SDavid Woodhouse de->namlen = namlen; 180614f7dd63SDavid Woodhouse de->offset = offset; 180714f7dd63SDavid Woodhouse de->ino = ino; 180814f7dd63SDavid Woodhouse de->d_type = d_type; 180914f7dd63SDavid Woodhouse memcpy(de->name, name, namlen); 181014f7dd63SDavid Woodhouse buf->used += reclen; 181114f7dd63SDavid Woodhouse 181214f7dd63SDavid Woodhouse return 0; 181314f7dd63SDavid Woodhouse } 181414f7dd63SDavid Woodhouse 1815ac7576f4SMiklos Szeredi static __be32 nfsd_buffered_readdir(struct file *file, nfsd_filldir_t func, 18162628b766SDavid Woodhouse struct readdir_cd *cdp, loff_t *offsetp) 18172628b766SDavid Woodhouse { 181814f7dd63SDavid Woodhouse struct buffered_dirent *de; 18192628b766SDavid Woodhouse int host_err; 182014f7dd63SDavid Woodhouse int size; 182114f7dd63SDavid Woodhouse loff_t offset; 1822ac6614b7SAl Viro struct readdir_data buf = { 1823ac6614b7SAl Viro .ctx.actor = nfsd_buffered_filldir, 1824ac6614b7SAl Viro .dirent = (void *)__get_free_page(GFP_KERNEL) 1825ac6614b7SAl Viro }; 18262628b766SDavid Woodhouse 182714f7dd63SDavid Woodhouse if (!buf.dirent) 18282f9092e1SDavid Woodhouse return nfserrno(-ENOMEM); 182914f7dd63SDavid Woodhouse 183014f7dd63SDavid Woodhouse offset = *offsetp; 18312628b766SDavid Woodhouse 183214f7dd63SDavid Woodhouse while (1) { 183314f7dd63SDavid Woodhouse unsigned int reclen; 183414f7dd63SDavid Woodhouse 1835b726e923SDoug Nazar cdp->err = nfserr_eof; /* will be cleared on successful read */ 183614f7dd63SDavid Woodhouse buf.used = 0; 183753c9c5c0SAl Viro buf.full = 0; 183814f7dd63SDavid Woodhouse 18395c0ba4e0SAl Viro host_err = iterate_dir(file, &buf.ctx); 184053c9c5c0SAl Viro if (buf.full) 184153c9c5c0SAl Viro host_err = 0; 184253c9c5c0SAl Viro 184353c9c5c0SAl Viro if (host_err < 0) 184414f7dd63SDavid Woodhouse break; 184514f7dd63SDavid Woodhouse 184614f7dd63SDavid Woodhouse size = buf.used; 184714f7dd63SDavid Woodhouse 184814f7dd63SDavid Woodhouse if (!size) 184914f7dd63SDavid Woodhouse break; 185014f7dd63SDavid Woodhouse 185114f7dd63SDavid Woodhouse de = (struct buffered_dirent *)buf.dirent; 185214f7dd63SDavid Woodhouse while (size > 0) { 185314f7dd63SDavid Woodhouse offset = de->offset; 185414f7dd63SDavid Woodhouse 185514f7dd63SDavid Woodhouse if (func(cdp, de->name, de->namlen, de->offset, 185614f7dd63SDavid Woodhouse de->ino, de->d_type)) 18572f9092e1SDavid Woodhouse break; 185814f7dd63SDavid Woodhouse 185914f7dd63SDavid Woodhouse if (cdp->err != nfs_ok) 18602f9092e1SDavid Woodhouse break; 186114f7dd63SDavid Woodhouse 186214f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(*de) + de->namlen, 186314f7dd63SDavid Woodhouse sizeof(u64)); 186414f7dd63SDavid Woodhouse size -= reclen; 186514f7dd63SDavid Woodhouse de = (struct buffered_dirent *)((char *)de + reclen); 186614f7dd63SDavid Woodhouse } 18672f9092e1SDavid Woodhouse if (size > 0) /* We bailed out early */ 18682f9092e1SDavid Woodhouse break; 18692f9092e1SDavid Woodhouse 1870c002a6c7SDavid Woodhouse offset = vfs_llseek(file, 0, SEEK_CUR); 187114f7dd63SDavid Woodhouse } 187214f7dd63SDavid Woodhouse 187314f7dd63SDavid Woodhouse free_page((unsigned long)(buf.dirent)); 18742628b766SDavid Woodhouse 18752628b766SDavid Woodhouse if (host_err) 18762628b766SDavid Woodhouse return nfserrno(host_err); 187714f7dd63SDavid Woodhouse 187814f7dd63SDavid Woodhouse *offsetp = offset; 18792628b766SDavid Woodhouse return cdp->err; 18802628b766SDavid Woodhouse } 18812628b766SDavid Woodhouse 18821da177e4SLinus Torvalds /* 18831da177e4SLinus Torvalds * Read entries from a directory. 18841da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 18851da177e4SLinus Torvalds */ 18866264d69dSAl Viro __be32 18871da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 1888ac7576f4SMiklos Szeredi struct readdir_cd *cdp, nfsd_filldir_t func) 18891da177e4SLinus Torvalds { 18906264d69dSAl Viro __be32 err; 18911da177e4SLinus Torvalds struct file *file; 18921da177e4SLinus Torvalds loff_t offset = *offsetp; 189306effdbbSBernd Schubert int may_flags = NFSD_MAY_READ; 18941da177e4SLinus Torvalds 189506effdbbSBernd Schubert /* NFSv2 only supports 32 bit cookies */ 189606effdbbSBernd Schubert if (rqstp->rq_vers > 2) 189706effdbbSBernd Schubert may_flags |= NFSD_MAY_64BIT_COOKIE; 189806effdbbSBernd Schubert 189906effdbbSBernd Schubert err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file); 19001da177e4SLinus Torvalds if (err) 19011da177e4SLinus Torvalds goto out; 19021da177e4SLinus Torvalds 1903b108fe6bSJeff Layton offset = vfs_llseek(file, offset, SEEK_SET); 19041da177e4SLinus Torvalds if (offset < 0) { 19051da177e4SLinus Torvalds err = nfserrno((int)offset); 19061da177e4SLinus Torvalds goto out_close; 19071da177e4SLinus Torvalds } 19081da177e4SLinus Torvalds 190914f7dd63SDavid Woodhouse err = nfsd_buffered_readdir(file, func, cdp, offsetp); 19101da177e4SLinus Torvalds 19111da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 19121da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 19131da177e4SLinus Torvalds out_close: 1914fd891454SChristoph Hellwig fput(file); 19151da177e4SLinus Torvalds out: 19161da177e4SLinus Torvalds return err; 19171da177e4SLinus Torvalds } 19181da177e4SLinus Torvalds 19191da177e4SLinus Torvalds /* 19201da177e4SLinus Torvalds * Get file system stats 19211da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 19221da177e4SLinus Torvalds */ 19236264d69dSAl Viro __be32 192404716e66SJ. Bruce Fields nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) 19251da177e4SLinus Torvalds { 1926f6360efbSTakashi Iwai __be32 err; 1927f6360efbSTakashi Iwai 1928f6360efbSTakashi Iwai err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); 1929f6360efbSTakashi Iwai if (!err) { 1930ebabe9a9SChristoph Hellwig struct path path = { 1931ebabe9a9SChristoph Hellwig .mnt = fhp->fh_export->ex_path.mnt, 1932ebabe9a9SChristoph Hellwig .dentry = fhp->fh_dentry, 1933ebabe9a9SChristoph Hellwig }; 1934f6360efbSTakashi Iwai if (vfs_statfs(&path, stat)) 19351da177e4SLinus Torvalds err = nfserr_io; 1936f6360efbSTakashi Iwai } 19371da177e4SLinus Torvalds return err; 19381da177e4SLinus Torvalds } 19391da177e4SLinus Torvalds 1940c7d51402SJ. Bruce Fields static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) 1941e22841c6SJ. Bruce Fields { 1942c7d51402SJ. Bruce Fields return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; 1943e22841c6SJ. Bruce Fields } 1944e22841c6SJ. Bruce Fields 19451da177e4SLinus Torvalds /* 19461da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 19471da177e4SLinus Torvalds */ 19486264d69dSAl Viro __be32 19490ec757dfSJ. Bruce Fields nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, 19500ec757dfSJ. Bruce Fields struct dentry *dentry, int acc) 19511da177e4SLinus Torvalds { 19522b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 19531da177e4SLinus Torvalds int err; 19541da177e4SLinus Torvalds 1955aea93397SJ. Bruce Fields if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) 19561da177e4SLinus Torvalds return 0; 19571da177e4SLinus Torvalds #if 0 19581da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 19591da177e4SLinus Torvalds acc, 19608837abcaSMiklos Szeredi (acc & NFSD_MAY_READ)? " read" : "", 19618837abcaSMiklos Szeredi (acc & NFSD_MAY_WRITE)? " write" : "", 19628837abcaSMiklos Szeredi (acc & NFSD_MAY_EXEC)? " exec" : "", 19638837abcaSMiklos Szeredi (acc & NFSD_MAY_SATTR)? " sattr" : "", 19648837abcaSMiklos Szeredi (acc & NFSD_MAY_TRUNC)? " trunc" : "", 19658837abcaSMiklos Szeredi (acc & NFSD_MAY_LOCK)? " lock" : "", 19668837abcaSMiklos Szeredi (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", 19671da177e4SLinus Torvalds inode->i_mode, 19681da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 19691da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 19702c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); 19711da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 19725cc0a840SDavid Howells inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); 19731da177e4SLinus Torvalds #endif 19741da177e4SLinus Torvalds 19751da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 19761da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 19771da177e4SLinus Torvalds * device special file, we ignore rofs. 19781da177e4SLinus Torvalds */ 19798837abcaSMiklos Szeredi if (!(acc & NFSD_MAY_LOCAL_ACCESS)) 19808837abcaSMiklos Szeredi if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { 19812c463e95SDave Hansen if (exp_rdonly(rqstp, exp) || 19822c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)) 19831da177e4SLinus Torvalds return nfserr_rofs; 19848837abcaSMiklos Szeredi if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) 19851da177e4SLinus Torvalds return nfserr_perm; 19861da177e4SLinus Torvalds } 19878837abcaSMiklos Szeredi if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) 19881da177e4SLinus Torvalds return nfserr_perm; 19891da177e4SLinus Torvalds 19908837abcaSMiklos Szeredi if (acc & NFSD_MAY_LOCK) { 19911da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 19921da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 19931da177e4SLinus Torvalds * ownership 19941da177e4SLinus Torvalds */ 19951da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 19961da177e4SLinus Torvalds return 0; 19971da177e4SLinus Torvalds else 19988837abcaSMiklos Szeredi acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; 19991da177e4SLinus Torvalds } 20001da177e4SLinus Torvalds /* 20011da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 20021da177e4SLinus Torvalds * would normally be checked at open time. This is to make 20031da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 20041da177e4SLinus Torvalds * 20051da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 20061da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 20071da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 20081da177e4SLinus Torvalds * always implies file truncation. 20091da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 20101da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 20111da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 20121da177e4SLinus Torvalds * with NFSv3. 20131da177e4SLinus Torvalds */ 20148837abcaSMiklos Szeredi if ((acc & NFSD_MAY_OWNER_OVERRIDE) && 20156fab8779SEric W. Biederman uid_eq(inode->i_uid, current_fsuid())) 20161da177e4SLinus Torvalds return 0; 20171da177e4SLinus Torvalds 20188837abcaSMiklos Szeredi /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ 2019f419a2e3SAl Viro err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); 20201da177e4SLinus Torvalds 20211da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 20221da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 2023a043226bSJ. Bruce Fields (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || 2024a043226bSJ. Bruce Fields acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) 2025f419a2e3SAl Viro err = inode_permission(inode, MAY_EXEC); 20261da177e4SLinus Torvalds 20271da177e4SLinus Torvalds return err? nfserrno(err) : 0; 20281da177e4SLinus Torvalds } 20291da177e4SLinus Torvalds 20301da177e4SLinus Torvalds void 20311da177e4SLinus Torvalds nfsd_racache_shutdown(void) 20321da177e4SLinus Torvalds { 203354a66e54SJeff Layton struct raparms *raparm, *last_raparm; 203454a66e54SJeff Layton unsigned int i; 203554a66e54SJeff Layton 20361da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 203754a66e54SJeff Layton 203854a66e54SJeff Layton for (i = 0; i < RAPARM_HASH_SIZE; i++) { 203954a66e54SJeff Layton raparm = raparm_hash[i].pb_head; 204054a66e54SJeff Layton while(raparm) { 204154a66e54SJeff Layton last_raparm = raparm; 204254a66e54SJeff Layton raparm = raparm->p_next; 204354a66e54SJeff Layton kfree(last_raparm); 204454a66e54SJeff Layton } 204554a66e54SJeff Layton raparm_hash[i].pb_head = NULL; 204654a66e54SJeff Layton } 20471da177e4SLinus Torvalds } 20481da177e4SLinus Torvalds /* 20491da177e4SLinus Torvalds * Initialize readahead param cache 20501da177e4SLinus Torvalds */ 20511da177e4SLinus Torvalds int 20521da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 20531da177e4SLinus Torvalds { 20541da177e4SLinus Torvalds int i; 2055fce1456aSGreg Banks int j = 0; 2056fce1456aSGreg Banks int nperbucket; 205754a66e54SJeff Layton struct raparms **raparm = NULL; 20581da177e4SLinus Torvalds 2059fce1456aSGreg Banks 206054a66e54SJeff Layton if (raparm_hash[0].pb_head) 20611da177e4SLinus Torvalds return 0; 206254a66e54SJeff Layton nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); 20633c7aa15dSKinglong Mee nperbucket = max(2, nperbucket); 206454a66e54SJeff Layton cache_size = nperbucket * RAPARM_HASH_SIZE; 20654b3bb06bSYan Burman 20664b3bb06bSYan Burman dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); 206754a66e54SJeff Layton 2068fce1456aSGreg Banks for (i = 0; i < RAPARM_HASH_SIZE; i++) { 2069fce1456aSGreg Banks spin_lock_init(&raparm_hash[i].pb_lock); 207054a66e54SJeff Layton 207154a66e54SJeff Layton raparm = &raparm_hash[i].pb_head; 207254a66e54SJeff Layton for (j = 0; j < nperbucket; j++) { 207354a66e54SJeff Layton *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); 207454a66e54SJeff Layton if (!*raparm) 207554a66e54SJeff Layton goto out_nomem; 207654a66e54SJeff Layton raparm = &(*raparm)->p_next; 2077fce1456aSGreg Banks } 207854a66e54SJeff Layton *raparm = NULL; 20791da177e4SLinus Torvalds } 20804b3bb06bSYan Burman 20811da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 20821da177e4SLinus Torvalds return 0; 208354a66e54SJeff Layton 208454a66e54SJeff Layton out_nomem: 208554a66e54SJeff Layton dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); 208654a66e54SJeff Layton nfsd_racache_shutdown(); 208754a66e54SJeff Layton return -ENOMEM; 20881da177e4SLinus Torvalds } 2089