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> 191da177e4SLinus Torvalds #include <linux/fcntl.h> 201da177e4SLinus Torvalds #include <linux/namei.h> 211da177e4SLinus Torvalds #include <linux/delay.h> 220eeca283SRobert Love #include <linux/fsnotify.h> 231da177e4SLinus Torvalds #include <linux/posix_acl_xattr.h> 241da177e4SLinus Torvalds #include <linux/xattr.h> 259a74af21SBoaz Harrosh #include <linux/jhash.h> 269a74af21SBoaz Harrosh #include <linux/ima.h> 275a0e3ad6STejun Heo #include <linux/slab.h> 289a74af21SBoaz Harrosh #include <asm/uaccess.h> 29f501912aSBen Myers #include <linux/exportfs.h> 30f501912aSBen Myers #include <linux/writeback.h> 3118032ca0SDavid Quigley #include <linux/security.h> 329a74af21SBoaz Harrosh 339a74af21SBoaz Harrosh #ifdef CONFIG_NFSD_V3 349a74af21SBoaz Harrosh #include "xdr3.h" 359a74af21SBoaz Harrosh #endif /* CONFIG_NFSD_V3 */ 369a74af21SBoaz Harrosh 375be196e5SChristoph Hellwig #ifdef CONFIG_NFSD_V4 382ca72e17SJ. Bruce Fields #include "acl.h" 392ca72e17SJ. Bruce Fields #include "idmap.h" 401da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V4 */ 411da177e4SLinus Torvalds 429a74af21SBoaz Harrosh #include "nfsd.h" 439a74af21SBoaz Harrosh #include "vfs.h" 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds #define NFSDDBG_FACILITY NFSDDBG_FILEOP 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds /* 491da177e4SLinus Torvalds * This is a cache of readahead params that help us choose the proper 501da177e4SLinus Torvalds * readahead strategy. Initially, we set all readahead parameters to 0 511da177e4SLinus Torvalds * and let the VFS handle things. 521da177e4SLinus Torvalds * If you increase the number of cached files very much, you'll need to 531da177e4SLinus Torvalds * add a hash table here. 541da177e4SLinus Torvalds */ 551da177e4SLinus Torvalds struct raparms { 561da177e4SLinus Torvalds struct raparms *p_next; 571da177e4SLinus Torvalds unsigned int p_count; 581da177e4SLinus Torvalds ino_t p_ino; 591da177e4SLinus Torvalds dev_t p_dev; 601da177e4SLinus Torvalds int p_set; 611da177e4SLinus Torvalds struct file_ra_state p_ra; 62fce1456aSGreg Banks unsigned int p_hindex; 631da177e4SLinus Torvalds }; 641da177e4SLinus Torvalds 65fce1456aSGreg Banks struct raparm_hbucket { 66fce1456aSGreg Banks struct raparms *pb_head; 67fce1456aSGreg Banks spinlock_t pb_lock; 68fce1456aSGreg Banks } ____cacheline_aligned_in_smp; 69fce1456aSGreg Banks 70fce1456aSGreg Banks #define RAPARM_HASH_BITS 4 71fce1456aSGreg Banks #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) 72fce1456aSGreg Banks #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) 73fce1456aSGreg Banks static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds /* 761da177e4SLinus Torvalds * Called from nfsd_lookup and encode_dirent. Check if we have crossed 771da177e4SLinus Torvalds * a mount point. 78e0bb89efSJ.Bruce Fields * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, 791da177e4SLinus Torvalds * or nfs_ok having possibly changed *dpp and *expp 801da177e4SLinus Torvalds */ 811da177e4SLinus Torvalds int 821da177e4SLinus Torvalds nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 831da177e4SLinus Torvalds struct svc_export **expp) 841da177e4SLinus Torvalds { 851da177e4SLinus Torvalds struct svc_export *exp = *expp, *exp2 = NULL; 861da177e4SLinus Torvalds struct dentry *dentry = *dpp; 8791c9fa8fSAl Viro struct path path = {.mnt = mntget(exp->ex_path.mnt), 8891c9fa8fSAl Viro .dentry = dget(dentry)}; 896264d69dSAl Viro int err = 0; 901da177e4SLinus Torvalds 917cc90cc3SAl Viro err = follow_down(&path); 92cc53ce53SDavid Howells if (err < 0) 93cc53ce53SDavid Howells goto out; 941da177e4SLinus Torvalds 9591c9fa8fSAl Viro exp2 = rqst_exp_get_by_name(rqstp, &path); 961da177e4SLinus Torvalds if (IS_ERR(exp2)) { 971da177e4SLinus Torvalds err = PTR_ERR(exp2); 983b6cee7bSJ. Bruce Fields /* 993b6cee7bSJ. Bruce Fields * We normally allow NFS clients to continue 1003b6cee7bSJ. Bruce Fields * "underneath" a mountpoint that is not exported. 1013b6cee7bSJ. Bruce Fields * The exception is V4ROOT, where no traversal is ever 1023b6cee7bSJ. Bruce Fields * allowed without an explicit export of the new 1033b6cee7bSJ. Bruce Fields * directory. 1043b6cee7bSJ. Bruce Fields */ 1053b6cee7bSJ. Bruce Fields if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) 1063b6cee7bSJ. Bruce Fields err = 0; 10791c9fa8fSAl Viro path_put(&path); 1081da177e4SLinus Torvalds goto out; 1091da177e4SLinus Torvalds } 1103c394ddaSSteve Dickson if (nfsd_v4client(rqstp) || 1113c394ddaSSteve Dickson (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { 1121da177e4SLinus Torvalds /* successfully crossed mount point */ 1131644ccc8SAl Viro /* 11491c9fa8fSAl Viro * This is subtle: path.dentry is *not* on path.mnt 11591c9fa8fSAl Viro * at this point. The only reason we are safe is that 11691c9fa8fSAl Viro * original mnt is pinned down by exp, so we should 11791c9fa8fSAl Viro * put path *before* putting exp 1181644ccc8SAl Viro */ 11991c9fa8fSAl Viro *dpp = path.dentry; 12091c9fa8fSAl Viro path.dentry = dentry; 1211644ccc8SAl Viro *expp = exp2; 12291c9fa8fSAl Viro exp2 = exp; 1231da177e4SLinus Torvalds } 12491c9fa8fSAl Viro path_put(&path); 12591c9fa8fSAl Viro exp_put(exp2); 1261da177e4SLinus Torvalds out: 1271da177e4SLinus Torvalds return err; 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds 130289ede45SJ. Bruce Fields static void follow_to_parent(struct path *path) 131289ede45SJ. Bruce Fields { 132289ede45SJ. Bruce Fields struct dentry *dp; 133289ede45SJ. Bruce Fields 134289ede45SJ. Bruce Fields while (path->dentry == path->mnt->mnt_root && follow_up(path)) 135289ede45SJ. Bruce Fields ; 136289ede45SJ. Bruce Fields dp = dget_parent(path->dentry); 137289ede45SJ. Bruce Fields dput(path->dentry); 138289ede45SJ. Bruce Fields path->dentry = dp; 139289ede45SJ. Bruce Fields } 140289ede45SJ. Bruce Fields 141289ede45SJ. Bruce Fields static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) 142289ede45SJ. Bruce Fields { 143289ede45SJ. Bruce Fields struct svc_export *exp2; 144289ede45SJ. Bruce Fields struct path path = {.mnt = mntget((*exp)->ex_path.mnt), 145289ede45SJ. Bruce Fields .dentry = dget(dparent)}; 146289ede45SJ. Bruce Fields 147289ede45SJ. Bruce Fields follow_to_parent(&path); 148289ede45SJ. Bruce Fields 149289ede45SJ. Bruce Fields exp2 = rqst_exp_parent(rqstp, &path); 150289ede45SJ. Bruce Fields if (PTR_ERR(exp2) == -ENOENT) { 151289ede45SJ. Bruce Fields *dentryp = dget(dparent); 152289ede45SJ. Bruce Fields } else if (IS_ERR(exp2)) { 153289ede45SJ. Bruce Fields path_put(&path); 154289ede45SJ. Bruce Fields return PTR_ERR(exp2); 155289ede45SJ. Bruce Fields } else { 156289ede45SJ. Bruce Fields *dentryp = dget(path.dentry); 157289ede45SJ. Bruce Fields exp_put(*exp); 158289ede45SJ. Bruce Fields *exp = exp2; 159289ede45SJ. Bruce Fields } 160289ede45SJ. Bruce Fields path_put(&path); 161289ede45SJ. Bruce Fields return 0; 162289ede45SJ. Bruce Fields } 163289ede45SJ. Bruce Fields 16482ead7feSJ. Bruce Fields /* 16582ead7feSJ. Bruce Fields * For nfsd purposes, we treat V4ROOT exports as though there was an 16682ead7feSJ. Bruce Fields * export at *every* directory. 16782ead7feSJ. Bruce Fields */ 1683227fa41SJ. Bruce Fields int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) 16982ead7feSJ. Bruce Fields { 17082ead7feSJ. Bruce Fields if (d_mountpoint(dentry)) 17182ead7feSJ. Bruce Fields return 1; 17211fcee02STrond Myklebust if (nfsd4_is_junction(dentry)) 17311fcee02STrond Myklebust return 1; 17482ead7feSJ. Bruce Fields if (!(exp->ex_flags & NFSEXP_V4ROOT)) 17582ead7feSJ. Bruce Fields return 0; 17682ead7feSJ. Bruce Fields return dentry->d_inode != NULL; 17782ead7feSJ. Bruce Fields } 17882ead7feSJ. Bruce Fields 1796264d69dSAl Viro __be32 1806c0a654dSJ. Bruce Fields nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, 1815a022fc8SChuck Lever const char *name, unsigned int len, 1826c0a654dSJ. Bruce Fields struct svc_export **exp_ret, struct dentry **dentry_ret) 1831da177e4SLinus Torvalds { 1841da177e4SLinus Torvalds struct svc_export *exp; 1851da177e4SLinus Torvalds struct dentry *dparent; 1861da177e4SLinus Torvalds struct dentry *dentry; 1876264d69dSAl Viro int host_err; 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds dparent = fhp->fh_dentry; 1921da177e4SLinus Torvalds exp = fhp->fh_export; 1931da177e4SLinus Torvalds exp_get(exp); 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds /* Lookup the name, but don't follow links */ 1961da177e4SLinus Torvalds if (isdotent(name, len)) { 1971da177e4SLinus Torvalds if (len==1) 1981da177e4SLinus Torvalds dentry = dget(dparent); 19954775491SJan Blunck else if (dparent != exp->ex_path.dentry) 2001da177e4SLinus Torvalds dentry = dget_parent(dparent); 201fed83811SJ. Bruce Fields else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) 2021da177e4SLinus Torvalds dentry = dget(dparent); /* .. == . just like at / */ 2031da177e4SLinus Torvalds else { 2041da177e4SLinus Torvalds /* checking mountpoint crossing is very different when stepping up */ 205289ede45SJ. Bruce Fields host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); 206289ede45SJ. Bruce Fields if (host_err) 2071da177e4SLinus Torvalds goto out_nfserr; 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds } else { 2104335723eSJ. Bruce Fields /* 2114335723eSJ. Bruce Fields * In the nfsd4_open() case, this may be held across 2124335723eSJ. Bruce Fields * subsequent open and delegation acquisition which may 2134335723eSJ. Bruce Fields * need to take the child's i_mutex: 2144335723eSJ. Bruce Fields */ 2154335723eSJ. Bruce Fields fh_lock_nested(fhp, I_MUTEX_PARENT); 2161da177e4SLinus Torvalds dentry = lookup_one_len(name, dparent, len); 2176264d69dSAl Viro host_err = PTR_ERR(dentry); 2181da177e4SLinus Torvalds if (IS_ERR(dentry)) 2191da177e4SLinus Torvalds goto out_nfserr; 2201da177e4SLinus Torvalds /* 2211da177e4SLinus Torvalds * check if we have crossed a mount point ... 2221da177e4SLinus Torvalds */ 22382ead7feSJ. Bruce Fields if (nfsd_mountpoint(dentry, exp)) { 2246264d69dSAl Viro if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 2251da177e4SLinus Torvalds dput(dentry); 2261da177e4SLinus Torvalds goto out_nfserr; 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds } 2291da177e4SLinus Torvalds } 2306c0a654dSJ. Bruce Fields *dentry_ret = dentry; 2316c0a654dSJ. Bruce Fields *exp_ret = exp; 2326c0a654dSJ. Bruce Fields return 0; 2336c0a654dSJ. Bruce Fields 2346c0a654dSJ. Bruce Fields out_nfserr: 2356c0a654dSJ. Bruce Fields exp_put(exp); 2366c0a654dSJ. Bruce Fields return nfserrno(host_err); 2376c0a654dSJ. Bruce Fields } 2386c0a654dSJ. Bruce Fields 2396c0a654dSJ. Bruce Fields /* 2406c0a654dSJ. Bruce Fields * Look up one component of a pathname. 2416c0a654dSJ. Bruce Fields * N.B. After this call _both_ fhp and resfh need an fh_put 2426c0a654dSJ. Bruce Fields * 2436c0a654dSJ. Bruce Fields * If the lookup would cross a mountpoint, and the mounted filesystem 2446c0a654dSJ. Bruce Fields * is exported to the client with NFSEXP_NOHIDE, then the lookup is 2456c0a654dSJ. Bruce Fields * accepted as it stands and the mounted directory is 2466c0a654dSJ. Bruce Fields * returned. Otherwise the covered directory is returned. 2476c0a654dSJ. Bruce Fields * NOTE: this mountpoint crossing is not supported properly by all 2486c0a654dSJ. Bruce Fields * clients and is explicitly disallowed for NFSv3 2496c0a654dSJ. Bruce Fields * NeilBrown <neilb@cse.unsw.edu.au> 2506c0a654dSJ. Bruce Fields */ 2516c0a654dSJ. Bruce Fields __be32 2526c0a654dSJ. Bruce Fields nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 2535a022fc8SChuck Lever unsigned int len, struct svc_fh *resfh) 2546c0a654dSJ. Bruce Fields { 2556c0a654dSJ. Bruce Fields struct svc_export *exp; 2566c0a654dSJ. Bruce Fields struct dentry *dentry; 2576c0a654dSJ. Bruce Fields __be32 err; 2586c0a654dSJ. Bruce Fields 25929a78a3eSJ. Bruce Fields err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 26029a78a3eSJ. Bruce Fields if (err) 26129a78a3eSJ. Bruce Fields return err; 2626c0a654dSJ. Bruce Fields err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); 2636c0a654dSJ. Bruce Fields if (err) 2646c0a654dSJ. Bruce Fields return err; 26532c1eb0cSAndy Adamson err = check_nfsd_access(exp, rqstp); 26632c1eb0cSAndy Adamson if (err) 26732c1eb0cSAndy Adamson goto out; 2681da177e4SLinus Torvalds /* 2691da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2701da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2711da177e4SLinus Torvalds */ 2721da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2731da177e4SLinus Torvalds if (!err && !dentry->d_inode) 2741da177e4SLinus Torvalds err = nfserr_noent; 27532c1eb0cSAndy Adamson out: 2761da177e4SLinus Torvalds dput(dentry); 2771da177e4SLinus Torvalds exp_put(exp); 2781da177e4SLinus Torvalds return err; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 281f501912aSBen Myers /* 282f501912aSBen Myers * Commit metadata changes to stable storage. 283f501912aSBen Myers */ 284f501912aSBen Myers static int 285f501912aSBen Myers commit_metadata(struct svc_fh *fhp) 286f501912aSBen Myers { 287f501912aSBen Myers struct inode *inode = fhp->fh_dentry->d_inode; 288f501912aSBen Myers const struct export_operations *export_ops = inode->i_sb->s_export_op; 289f501912aSBen Myers 290f501912aSBen Myers if (!EX_ISSYNC(fhp->fh_export)) 291f501912aSBen Myers return 0; 292f501912aSBen Myers 293c3765016SChristoph Hellwig if (export_ops->commit_metadata) 294c3765016SChristoph Hellwig return export_ops->commit_metadata(inode); 295c3765016SChristoph Hellwig return sync_inode_metadata(inode, 1); 296f501912aSBen Myers } 2976c0a654dSJ. Bruce Fields 2981da177e4SLinus Torvalds /* 299818e5a22SChristoph Hellwig * Go over the attributes and take care of the small differences between 300818e5a22SChristoph Hellwig * NFS semantics and what Linux expects. 301818e5a22SChristoph Hellwig */ 302818e5a22SChristoph Hellwig static void 303818e5a22SChristoph Hellwig nfsd_sanitize_attrs(struct inode *inode, struct iattr *iap) 304818e5a22SChristoph Hellwig { 305818e5a22SChristoph Hellwig /* 306818e5a22SChristoph Hellwig * NFSv2 does not differentiate between "set-[ac]time-to-now" 307818e5a22SChristoph Hellwig * which only requires access, and "set-[ac]time-to-X" which 308818e5a22SChristoph Hellwig * requires ownership. 309818e5a22SChristoph Hellwig * So if it looks like it might be "set both to the same time which 310818e5a22SChristoph Hellwig * is close to now", and if inode_change_ok fails, then we 311818e5a22SChristoph Hellwig * convert to "set to now" instead of "set to explicit time" 312818e5a22SChristoph Hellwig * 313818e5a22SChristoph Hellwig * We only call inode_change_ok as the last test as technically 314818e5a22SChristoph Hellwig * it is not an interface that we should be using. 315818e5a22SChristoph Hellwig */ 316818e5a22SChristoph Hellwig #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) 317818e5a22SChristoph Hellwig #define MAX_TOUCH_TIME_ERROR (30*60) 318818e5a22SChristoph Hellwig if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && 319818e5a22SChristoph Hellwig iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { 320818e5a22SChristoph Hellwig /* 321818e5a22SChristoph Hellwig * Looks probable. 322818e5a22SChristoph Hellwig * 323818e5a22SChristoph Hellwig * Now just make sure time is in the right ballpark. 324818e5a22SChristoph Hellwig * Solaris, at least, doesn't seem to care what the time 325818e5a22SChristoph Hellwig * request is. We require it be within 30 minutes of now. 326818e5a22SChristoph Hellwig */ 327818e5a22SChristoph Hellwig time_t delta = iap->ia_atime.tv_sec - get_seconds(); 328818e5a22SChristoph Hellwig if (delta < 0) 329818e5a22SChristoph Hellwig delta = -delta; 330818e5a22SChristoph Hellwig if (delta < MAX_TOUCH_TIME_ERROR && 331818e5a22SChristoph Hellwig inode_change_ok(inode, iap) != 0) { 332818e5a22SChristoph Hellwig /* 333818e5a22SChristoph Hellwig * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. 334818e5a22SChristoph Hellwig * This will cause notify_change to set these times 335818e5a22SChristoph Hellwig * to "now" 336818e5a22SChristoph Hellwig */ 337818e5a22SChristoph Hellwig iap->ia_valid &= ~BOTH_TIME_SET; 338818e5a22SChristoph Hellwig } 339818e5a22SChristoph Hellwig } 340818e5a22SChristoph Hellwig 341818e5a22SChristoph Hellwig /* sanitize the mode change */ 342818e5a22SChristoph Hellwig if (iap->ia_valid & ATTR_MODE) { 343818e5a22SChristoph Hellwig iap->ia_mode &= S_IALLUGO; 344818e5a22SChristoph Hellwig iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); 345818e5a22SChristoph Hellwig } 346818e5a22SChristoph Hellwig 347818e5a22SChristoph Hellwig /* Revoke setuid/setgid on chown */ 348818e5a22SChristoph Hellwig if (!S_ISDIR(inode->i_mode) && 349c4fa6d7cSStanislav Kholmanskikh ((iap->ia_valid & ATTR_UID) || (iap->ia_valid & ATTR_GID))) { 350818e5a22SChristoph Hellwig iap->ia_valid |= ATTR_KILL_PRIV; 351818e5a22SChristoph Hellwig if (iap->ia_valid & ATTR_MODE) { 352818e5a22SChristoph Hellwig /* we're setting mode too, just clear the s*id bits */ 353818e5a22SChristoph Hellwig iap->ia_mode &= ~S_ISUID; 354818e5a22SChristoph Hellwig if (iap->ia_mode & S_IXGRP) 355818e5a22SChristoph Hellwig iap->ia_mode &= ~S_ISGID; 356818e5a22SChristoph Hellwig } else { 357818e5a22SChristoph Hellwig /* set ATTR_KILL_* bits and let VFS handle it */ 358818e5a22SChristoph Hellwig iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); 359818e5a22SChristoph Hellwig } 360818e5a22SChristoph Hellwig } 361818e5a22SChristoph Hellwig } 362818e5a22SChristoph Hellwig 363818e5a22SChristoph Hellwig static __be32 364818e5a22SChristoph Hellwig nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp, 365818e5a22SChristoph Hellwig struct iattr *iap) 366818e5a22SChristoph Hellwig { 367818e5a22SChristoph Hellwig struct inode *inode = fhp->fh_dentry->d_inode; 368818e5a22SChristoph Hellwig int host_err; 369818e5a22SChristoph Hellwig 370818e5a22SChristoph Hellwig if (iap->ia_size < inode->i_size) { 371818e5a22SChristoph Hellwig __be32 err; 372818e5a22SChristoph Hellwig 373818e5a22SChristoph Hellwig err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 374818e5a22SChristoph Hellwig NFSD_MAY_TRUNC | NFSD_MAY_OWNER_OVERRIDE); 375818e5a22SChristoph Hellwig if (err) 376818e5a22SChristoph Hellwig return err; 377818e5a22SChristoph Hellwig } 378818e5a22SChristoph Hellwig 379818e5a22SChristoph Hellwig host_err = get_write_access(inode); 380818e5a22SChristoph Hellwig if (host_err) 381818e5a22SChristoph Hellwig goto out_nfserrno; 382818e5a22SChristoph Hellwig 383818e5a22SChristoph Hellwig host_err = locks_verify_truncate(inode, NULL, iap->ia_size); 384818e5a22SChristoph Hellwig if (host_err) 385818e5a22SChristoph Hellwig goto out_put_write_access; 386818e5a22SChristoph Hellwig return 0; 387818e5a22SChristoph Hellwig 388818e5a22SChristoph Hellwig out_put_write_access: 389818e5a22SChristoph Hellwig put_write_access(inode); 390818e5a22SChristoph Hellwig out_nfserrno: 391818e5a22SChristoph Hellwig return nfserrno(host_err); 392818e5a22SChristoph Hellwig } 393818e5a22SChristoph Hellwig 394818e5a22SChristoph Hellwig /* 395818e5a22SChristoph Hellwig * Set various file attributes. After this call fhp needs an fh_put. 3961da177e4SLinus Torvalds */ 3976264d69dSAl Viro __be32 3981da177e4SLinus Torvalds nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 3991da177e4SLinus Torvalds int check_guard, time_t guardtime) 4001da177e4SLinus Torvalds { 4011da177e4SLinus Torvalds struct dentry *dentry; 4021da177e4SLinus Torvalds struct inode *inode; 4038837abcaSMiklos Szeredi int accmode = NFSD_MAY_SATTR; 404175a4eb7SAl Viro umode_t ftype = 0; 4056264d69dSAl Viro __be32 err; 4066264d69dSAl Viro int host_err; 4079f67f189SJ. Bruce Fields bool get_write_count; 4081da177e4SLinus Torvalds int size_change = 0; 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) 4118837abcaSMiklos Szeredi accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; 4121da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) 4131da177e4SLinus Torvalds ftype = S_IFREG; 4141da177e4SLinus Torvalds 4159f67f189SJ. Bruce Fields /* Callers that do fh_verify should do the fh_want_write: */ 4169f67f189SJ. Bruce Fields get_write_count = !fhp->fh_dentry; 4179f67f189SJ. Bruce Fields 4181da177e4SLinus Torvalds /* Get inode */ 4191da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 42015b7a1b8SNeilBrown if (err) 4211da177e4SLinus Torvalds goto out; 4229f67f189SJ. Bruce Fields if (get_write_count) { 4239f67f189SJ. Bruce Fields host_err = fh_want_write(fhp); 4249f67f189SJ. Bruce Fields if (host_err) 4259f67f189SJ. Bruce Fields return nfserrno(host_err); 4269f67f189SJ. Bruce Fields } 4271da177e4SLinus Torvalds 4281da177e4SLinus Torvalds dentry = fhp->fh_dentry; 4291da177e4SLinus Torvalds inode = dentry->d_inode; 4301da177e4SLinus Torvalds 43115b7a1b8SNeilBrown /* Ignore any mode updates on symlinks */ 43215b7a1b8SNeilBrown if (S_ISLNK(inode->i_mode)) 43315b7a1b8SNeilBrown iap->ia_valid &= ~ATTR_MODE; 43415b7a1b8SNeilBrown 43515b7a1b8SNeilBrown if (!iap->ia_valid) 43615b7a1b8SNeilBrown goto out; 43715b7a1b8SNeilBrown 438818e5a22SChristoph Hellwig nfsd_sanitize_attrs(inode, iap); 4391da177e4SLinus Torvalds 4409c85fca5SChristoph Hellwig /* 441818e5a22SChristoph Hellwig * The size case is special, it changes the file in addition to the 442818e5a22SChristoph Hellwig * attributes. 4439c85fca5SChristoph Hellwig */ 4441da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) { 445818e5a22SChristoph Hellwig err = nfsd_get_write_access(rqstp, fhp, iap); 4461da177e4SLinus Torvalds if (err) 4471da177e4SLinus Torvalds goto out; 4481da177e4SLinus Torvalds size_change = 1; 4491da177e4SLinus Torvalds } 4501da177e4SLinus Torvalds 4511da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 4521da177e4SLinus Torvalds 453987da479SChristoph Hellwig if (check_guard && guardtime != inode->i_ctime.tv_sec) { 4541da177e4SLinus Torvalds err = nfserr_notsync; 455987da479SChristoph Hellwig goto out_put_write_access; 456987da479SChristoph Hellwig } 457987da479SChristoph Hellwig 458987da479SChristoph Hellwig fh_lock(fhp); 45927ac0ffeSJ. Bruce Fields host_err = notify_change(dentry, iap, NULL); 4601da177e4SLinus Torvalds fh_unlock(fhp); 4611406b916SJ. R. Okajima err = nfserrno(host_err); 462987da479SChristoph Hellwig 463987da479SChristoph Hellwig out_put_write_access: 4641da177e4SLinus Torvalds if (size_change) 4651da177e4SLinus Torvalds put_write_access(inode); 4661da177e4SLinus Torvalds if (!err) 467b160fdabSChristoph Hellwig commit_metadata(fhp); 4681da177e4SLinus Torvalds out: 4691da177e4SLinus Torvalds return err; 4701da177e4SLinus Torvalds } 4711da177e4SLinus Torvalds 4725be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V4) 4739b4146e8SChuck Lever /* 4749b4146e8SChuck Lever * NFS junction information is stored in an extended attribute. 4759b4146e8SChuck Lever */ 4769b4146e8SChuck Lever #define NFSD_JUNCTION_XATTR_NAME XATTR_TRUSTED_PREFIX "junction.nfs" 4779b4146e8SChuck Lever 4789b4146e8SChuck Lever /** 4799b4146e8SChuck Lever * nfsd4_is_junction - Test if an object could be an NFS junction 4809b4146e8SChuck Lever * 4819b4146e8SChuck Lever * @dentry: object to test 4829b4146e8SChuck Lever * 4839b4146e8SChuck Lever * Returns 1 if "dentry" appears to contain NFS junction information. 4849b4146e8SChuck Lever * Otherwise 0 is returned. 4859b4146e8SChuck Lever */ 48611fcee02STrond Myklebust int nfsd4_is_junction(struct dentry *dentry) 48711fcee02STrond Myklebust { 48811fcee02STrond Myklebust struct inode *inode = dentry->d_inode; 48911fcee02STrond Myklebust 49011fcee02STrond Myklebust if (inode == NULL) 49111fcee02STrond Myklebust return 0; 49211fcee02STrond Myklebust if (inode->i_mode & S_IXUGO) 49311fcee02STrond Myklebust return 0; 49411fcee02STrond Myklebust if (!(inode->i_mode & S_ISVTX)) 49511fcee02STrond Myklebust return 0; 4969b4146e8SChuck Lever if (vfs_getxattr(dentry, NFSD_JUNCTION_XATTR_NAME, NULL, 0) <= 0) 49711fcee02STrond Myklebust return 0; 49811fcee02STrond Myklebust return 1; 49911fcee02STrond Myklebust } 50018032ca0SDavid Quigley #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 50118032ca0SDavid Quigley __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp, 50218032ca0SDavid Quigley struct xdr_netobj *label) 50318032ca0SDavid Quigley { 50418032ca0SDavid Quigley __be32 error; 50518032ca0SDavid Quigley int host_error; 50618032ca0SDavid Quigley struct dentry *dentry; 50718032ca0SDavid Quigley 50818032ca0SDavid Quigley error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); 50918032ca0SDavid Quigley if (error) 51018032ca0SDavid Quigley return error; 51118032ca0SDavid Quigley 51218032ca0SDavid Quigley dentry = fhp->fh_dentry; 51318032ca0SDavid Quigley 51418032ca0SDavid Quigley mutex_lock(&dentry->d_inode->i_mutex); 51518032ca0SDavid Quigley host_error = security_inode_setsecctx(dentry, label->data, label->len); 51618032ca0SDavid Quigley mutex_unlock(&dentry->d_inode->i_mutex); 51718032ca0SDavid Quigley return nfserrno(host_error); 51818032ca0SDavid Quigley } 51918032ca0SDavid Quigley #else 52018032ca0SDavid Quigley __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp, 52118032ca0SDavid Quigley struct xdr_netobj *label) 52218032ca0SDavid Quigley { 52318032ca0SDavid Quigley return nfserr_notsupp; 52418032ca0SDavid Quigley } 52518032ca0SDavid Quigley #endif 52618032ca0SDavid Quigley 5276a85d6c7SJ. Bruce Fields #endif /* defined(CONFIG_NFSD_V4) */ 5281da177e4SLinus Torvalds 5291da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 5301da177e4SLinus Torvalds /* 5311da177e4SLinus Torvalds * Check server access rights to a file system object 5321da177e4SLinus Torvalds */ 5331da177e4SLinus Torvalds struct accessmap { 5341da177e4SLinus Torvalds u32 access; 5351da177e4SLinus Torvalds int how; 5361da177e4SLinus Torvalds }; 5371da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 5388837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 5398837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 5408837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, 5418837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, 5421da177e4SLinus Torvalds 5431da177e4SLinus Torvalds { 0, 0 } 5441da177e4SLinus Torvalds }; 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 5478837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 5488837abcaSMiklos Szeredi { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, 5498837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, 5508837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, 5518837abcaSMiklos Szeredi { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds { 0, 0 } 5541da177e4SLinus Torvalds }; 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 5571da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 5581da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 5591da177e4SLinus Torvalds * (which really, the server doesn't care about). So 5601da177e4SLinus Torvalds * We provide simple access checking for them, looking 5611da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 5621da177e4SLinus Torvalds * filesystem checks 5631da177e4SLinus Torvalds */ 5648837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 5658837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 5668837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 5678837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds { 0, 0 } 5701da177e4SLinus Torvalds }; 5711da177e4SLinus Torvalds 5726264d69dSAl Viro __be32 5731da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 5741da177e4SLinus Torvalds { 5751da177e4SLinus Torvalds struct accessmap *map; 5761da177e4SLinus Torvalds struct svc_export *export; 5771da177e4SLinus Torvalds struct dentry *dentry; 5781da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 5796264d69dSAl Viro __be32 error; 5801da177e4SLinus Torvalds 5818837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 5821da177e4SLinus Torvalds if (error) 5831da177e4SLinus Torvalds goto out; 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds export = fhp->fh_export; 5861da177e4SLinus Torvalds dentry = fhp->fh_dentry; 5871da177e4SLinus Torvalds 5881da177e4SLinus Torvalds if (S_ISREG(dentry->d_inode->i_mode)) 5891da177e4SLinus Torvalds map = nfs3_regaccess; 5901da177e4SLinus Torvalds else if (S_ISDIR(dentry->d_inode->i_mode)) 5911da177e4SLinus Torvalds map = nfs3_diraccess; 5921da177e4SLinus Torvalds else 5931da177e4SLinus Torvalds map = nfs3_anyaccess; 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds query = *access; 5971da177e4SLinus Torvalds for (; map->access; map++) { 5981da177e4SLinus Torvalds if (map->access & query) { 5996264d69dSAl Viro __be32 err2; 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds sresult |= map->access; 6021da177e4SLinus Torvalds 6030ec757dfSJ. Bruce Fields err2 = nfsd_permission(rqstp, export, dentry, map->how); 6041da177e4SLinus Torvalds switch (err2) { 6051da177e4SLinus Torvalds case nfs_ok: 6061da177e4SLinus Torvalds result |= map->access; 6071da177e4SLinus Torvalds break; 6081da177e4SLinus Torvalds 6091da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 6101da177e4SLinus Torvalds * rather than an error occurred */ 6111da177e4SLinus Torvalds case nfserr_rofs: 6121da177e4SLinus Torvalds case nfserr_acces: 6131da177e4SLinus Torvalds case nfserr_perm: 6141da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 6151da177e4SLinus Torvalds break; 6161da177e4SLinus Torvalds default: 6171da177e4SLinus Torvalds error = err2; 6181da177e4SLinus Torvalds goto out; 6191da177e4SLinus Torvalds } 6201da177e4SLinus Torvalds } 6211da177e4SLinus Torvalds } 6221da177e4SLinus Torvalds *access = result; 6231da177e4SLinus Torvalds if (supported) 6241da177e4SLinus Torvalds *supported = sresult; 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds out: 6271da177e4SLinus Torvalds return error; 6281da177e4SLinus Torvalds } 6291da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 6301da177e4SLinus Torvalds 631105f4622SJ. Bruce Fields static int nfsd_open_break_lease(struct inode *inode, int access) 632105f4622SJ. Bruce Fields { 633105f4622SJ. Bruce Fields unsigned int mode; 6341da177e4SLinus Torvalds 635105f4622SJ. Bruce Fields if (access & NFSD_MAY_NOT_BREAK_LEASE) 636105f4622SJ. Bruce Fields return 0; 637105f4622SJ. Bruce Fields mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; 638105f4622SJ. Bruce Fields return break_lease(inode, mode | O_NONBLOCK); 639105f4622SJ. Bruce Fields } 6401da177e4SLinus Torvalds 6411da177e4SLinus Torvalds /* 6421da177e4SLinus Torvalds * Open an existing file or directory. 643999448a8SBernd Schubert * The may_flags argument indicates the type of open (read/write/lock) 644999448a8SBernd Schubert * and additional flags. 6451da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 6461da177e4SLinus Torvalds */ 6476264d69dSAl Viro __be32 648175a4eb7SAl Viro nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, 649999448a8SBernd Schubert int may_flags, struct file **filp) 6501da177e4SLinus Torvalds { 651765927b2SAl Viro struct path path; 6521da177e4SLinus Torvalds struct inode *inode; 6536264d69dSAl Viro int flags = O_RDONLY|O_LARGEFILE; 6546264d69dSAl Viro __be32 err; 65591885258SJeff Layton int host_err = 0; 6561da177e4SLinus Torvalds 657e0e81739SDavid Howells validate_process_creds(); 658e0e81739SDavid Howells 6591da177e4SLinus Torvalds /* 6601da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 6611da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 6621da177e4SLinus Torvalds * in case a chmod has now revoked permission. 663d91d0b56SJ. Bruce Fields * 664d91d0b56SJ. Bruce Fields * Arguably we should also allow the owner override for 665d91d0b56SJ. Bruce Fields * directories, but we never have and it doesn't seem to have 666d91d0b56SJ. Bruce Fields * caused anyone a problem. If we were to change this, note 667d91d0b56SJ. Bruce Fields * also that our filldir callbacks would need a variant of 668d91d0b56SJ. Bruce Fields * lookup_one_len that doesn't check permissions. 6691da177e4SLinus Torvalds */ 670d91d0b56SJ. Bruce Fields if (type == S_IFREG) 671d91d0b56SJ. Bruce Fields may_flags |= NFSD_MAY_OWNER_OVERRIDE; 672d91d0b56SJ. Bruce Fields err = fh_verify(rqstp, fhp, type, may_flags); 6731da177e4SLinus Torvalds if (err) 6741da177e4SLinus Torvalds goto out; 6751da177e4SLinus Torvalds 676765927b2SAl Viro path.mnt = fhp->fh_export->ex_path.mnt; 677765927b2SAl Viro path.dentry = fhp->fh_dentry; 678765927b2SAl Viro inode = path.dentry->d_inode; 6791da177e4SLinus Torvalds 6801da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 6811da177e4SLinus Torvalds * or any access when mandatory locking enabled 6821da177e4SLinus Torvalds */ 6831da177e4SLinus Torvalds err = nfserr_perm; 684999448a8SBernd Schubert if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE)) 6851da177e4SLinus Torvalds goto out; 6865e7fc436SJ. Bruce Fields /* 6875e7fc436SJ. Bruce Fields * We must ignore files (but only files) which might have mandatory 6885e7fc436SJ. Bruce Fields * locks on them because there is no way to know if the accesser has 6895e7fc436SJ. Bruce Fields * the lock. 6905e7fc436SJ. Bruce Fields */ 6915e7fc436SJ. Bruce Fields if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) 6921da177e4SLinus Torvalds goto out; 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds if (!inode->i_fop) 6951da177e4SLinus Torvalds goto out; 6961da177e4SLinus Torvalds 697999448a8SBernd Schubert host_err = nfsd_open_break_lease(inode, may_flags); 6986264d69dSAl Viro if (host_err) /* NOMEM or WOULDBLOCK */ 6991da177e4SLinus Torvalds goto out_nfserr; 7001da177e4SLinus Torvalds 701999448a8SBernd Schubert if (may_flags & NFSD_MAY_WRITE) { 702999448a8SBernd Schubert if (may_flags & NFSD_MAY_READ) 7039ecb6a08SJ. Bruce Fields flags = O_RDWR|O_LARGEFILE; 7049ecb6a08SJ. Bruce Fields else 7051da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 7061da177e4SLinus Torvalds } 707765927b2SAl Viro *filp = dentry_open(&path, flags, current_cred()); 708e4daf1ffSHarshula Jayasuriya if (IS_ERR(*filp)) { 7096264d69dSAl Viro host_err = PTR_ERR(*filp); 710e4daf1ffSHarshula Jayasuriya *filp = NULL; 711e4daf1ffSHarshula Jayasuriya } else { 712999448a8SBernd Schubert host_err = ima_file_check(*filp, may_flags); 713999448a8SBernd Schubert 71406effdbbSBernd Schubert if (may_flags & NFSD_MAY_64BIT_COOKIE) 71506effdbbSBernd Schubert (*filp)->f_mode |= FMODE_64BITHASH; 716aeaa5ccdSChuck Ebbert else 71706effdbbSBernd Schubert (*filp)->f_mode |= FMODE_32BITHASH; 71806effdbbSBernd Schubert } 71906effdbbSBernd Schubert 7201da177e4SLinus Torvalds out_nfserr: 7216264d69dSAl Viro err = nfserrno(host_err); 7221da177e4SLinus Torvalds out: 723e0e81739SDavid Howells validate_process_creds(); 7241da177e4SLinus Torvalds return err; 7251da177e4SLinus Torvalds } 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds /* 7281da177e4SLinus Torvalds * Close a file. 7291da177e4SLinus Torvalds */ 7301da177e4SLinus Torvalds void 7311da177e4SLinus Torvalds nfsd_close(struct file *filp) 7321da177e4SLinus Torvalds { 7331da177e4SLinus Torvalds fput(filp); 7341da177e4SLinus Torvalds } 7351da177e4SLinus Torvalds 7369a8d248eSJ. Bruce Fields /* 7371da177e4SLinus Torvalds * Obtain the readahead parameters for the file 7381da177e4SLinus Torvalds * specified by (dev, ino). 7391da177e4SLinus Torvalds */ 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvalds static inline struct raparms * 7421da177e4SLinus Torvalds nfsd_get_raparms(dev_t dev, ino_t ino) 7431da177e4SLinus Torvalds { 7441da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 7451da177e4SLinus Torvalds int depth = 0; 746fce1456aSGreg Banks unsigned int hash; 747fce1456aSGreg Banks struct raparm_hbucket *rab; 7481da177e4SLinus Torvalds 749fce1456aSGreg Banks hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; 750fce1456aSGreg Banks rab = &raparm_hash[hash]; 751fce1456aSGreg Banks 752fce1456aSGreg Banks spin_lock(&rab->pb_lock); 753fce1456aSGreg Banks for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { 7541da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 7551da177e4SLinus Torvalds goto found; 7561da177e4SLinus Torvalds depth++; 7571da177e4SLinus Torvalds if (ra->p_count == 0) 7581da177e4SLinus Torvalds frap = rap; 7591da177e4SLinus Torvalds } 7603aa6e0aaSKonstantin Khorenko depth = nfsdstats.ra_size; 7611da177e4SLinus Torvalds if (!frap) { 762fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 7631da177e4SLinus Torvalds return NULL; 7641da177e4SLinus Torvalds } 7651da177e4SLinus Torvalds rap = frap; 7661da177e4SLinus Torvalds ra = *frap; 7671da177e4SLinus Torvalds ra->p_dev = dev; 7681da177e4SLinus Torvalds ra->p_ino = ino; 7691da177e4SLinus Torvalds ra->p_set = 0; 770fce1456aSGreg Banks ra->p_hindex = hash; 7711da177e4SLinus Torvalds found: 772fce1456aSGreg Banks if (rap != &rab->pb_head) { 7731da177e4SLinus Torvalds *rap = ra->p_next; 774fce1456aSGreg Banks ra->p_next = rab->pb_head; 775fce1456aSGreg Banks rab->pb_head = ra; 7761da177e4SLinus Torvalds } 7771da177e4SLinus Torvalds ra->p_count++; 7781da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 779fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 7801da177e4SLinus Torvalds return ra; 7811da177e4SLinus Torvalds } 7821da177e4SLinus Torvalds 7831da177e4SLinus Torvalds /* 784cf8208d0SJens Axboe * Grab and keep cached pages associated with a file in the svc_rqst 785cf8208d0SJens Axboe * so that they can be passed to the network sendmsg/sendpage routines 786cf8208d0SJens Axboe * directly. They will be released after the sending has completed. 7871da177e4SLinus Torvalds */ 7881da177e4SLinus Torvalds static int 789cf8208d0SJens Axboe nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, 790cf8208d0SJens Axboe struct splice_desc *sd) 7911da177e4SLinus Torvalds { 792cf8208d0SJens Axboe struct svc_rqst *rqstp = sd->u.data; 793afc59400SJ. Bruce Fields struct page **pp = rqstp->rq_next_page; 794cf8208d0SJens Axboe struct page *page = buf->page; 795cf8208d0SJens Axboe size_t size; 796cf8208d0SJens Axboe 797cf8208d0SJens Axboe size = sd->len; 7981da177e4SLinus Torvalds 7991da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 8001da177e4SLinus Torvalds get_page(page); 801afc59400SJ. Bruce Fields put_page(*rqstp->rq_next_page); 802afc59400SJ. Bruce Fields *(rqstp->rq_next_page++) = page; 803cf8208d0SJens Axboe rqstp->rq_res.page_base = buf->offset; 8041da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 80544524359SNeilBrown } else if (page != pp[-1]) { 8061da177e4SLinus Torvalds get_page(page); 807afc59400SJ. Bruce Fields if (*rqstp->rq_next_page) 808afc59400SJ. Bruce Fields put_page(*rqstp->rq_next_page); 809afc59400SJ. Bruce Fields *(rqstp->rq_next_page++) = page; 8101da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 81144524359SNeilBrown } else 8121da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8131da177e4SLinus Torvalds 8141da177e4SLinus Torvalds return size; 8151da177e4SLinus Torvalds } 8161da177e4SLinus Torvalds 817cf8208d0SJens Axboe static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, 818cf8208d0SJens Axboe struct splice_desc *sd) 819cf8208d0SJens Axboe { 820cf8208d0SJens Axboe return __splice_from_pipe(pipe, sd, nfsd_splice_actor); 821cf8208d0SJens Axboe } 822cf8208d0SJens Axboe 8236264d69dSAl Viro static __be32 8241da177e4SLinus Torvalds nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 8251da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 8261da177e4SLinus Torvalds { 8271da177e4SLinus Torvalds mm_segment_t oldfs; 8286264d69dSAl Viro __be32 err; 8296264d69dSAl Viro int host_err; 8301da177e4SLinus Torvalds 8311da177e4SLinus Torvalds err = nfserr_perm; 832a8754beeSDave Hansen 833cf8208d0SJens Axboe if (file->f_op->splice_read && rqstp->rq_splice_ok) { 834cf8208d0SJens Axboe struct splice_desc sd = { 835cf8208d0SJens Axboe .len = 0, 836cf8208d0SJens Axboe .total_len = *count, 837cf8208d0SJens Axboe .pos = offset, 838cf8208d0SJens Axboe .u.data = rqstp, 839cf8208d0SJens Axboe }; 840cf8208d0SJens Axboe 841afc59400SJ. Bruce Fields rqstp->rq_next_page = rqstp->rq_respages + 1; 842cf8208d0SJens Axboe host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); 8431da177e4SLinus Torvalds } else { 8441da177e4SLinus Torvalds oldfs = get_fs(); 8451da177e4SLinus Torvalds set_fs(KERNEL_DS); 8466264d69dSAl Viro host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); 8471da177e4SLinus Torvalds set_fs(oldfs); 8481da177e4SLinus Torvalds } 8491da177e4SLinus Torvalds 8506264d69dSAl Viro if (host_err >= 0) { 8516264d69dSAl Viro nfsdstats.io_read += host_err; 8526264d69dSAl Viro *count = host_err; 8531da177e4SLinus Torvalds err = 0; 8542a12a9d7SEric Paris fsnotify_access(file); 8551da177e4SLinus Torvalds } else 8566264d69dSAl Viro err = nfserrno(host_err); 8571da177e4SLinus Torvalds return err; 8581da177e4SLinus Torvalds } 8591da177e4SLinus Torvalds 860d911df7bSJ. Bruce Fields /* 861d911df7bSJ. Bruce Fields * Gathered writes: If another process is currently writing to the file, 862d911df7bSJ. Bruce Fields * there's a high chance this is another nfsd (triggered by a bulk write 863d911df7bSJ. Bruce Fields * from a client's biod). Rather than syncing the file with each write 864d911df7bSJ. Bruce Fields * request, we sleep for 10 msec. 865d911df7bSJ. Bruce Fields * 866d911df7bSJ. Bruce Fields * I don't know if this roughly approximates C. Juszak's idea of 867d911df7bSJ. Bruce Fields * gathered writes, but it's a nice and simple solution (IMHO), and it 868d911df7bSJ. Bruce Fields * seems to work:-) 869d911df7bSJ. Bruce Fields * 870d911df7bSJ. Bruce Fields * Note: we do this only in the NFSv2 case, since v3 and higher have a 871d911df7bSJ. Bruce Fields * better tool (separate unstable writes and commits) for solving this 872d911df7bSJ. Bruce Fields * problem. 873d911df7bSJ. Bruce Fields */ 874d911df7bSJ. Bruce Fields static int wait_for_concurrent_writes(struct file *file) 875d911df7bSJ. Bruce Fields { 876496ad9aaSAl Viro struct inode *inode = file_inode(file); 877d911df7bSJ. Bruce Fields static ino_t last_ino; 878d911df7bSJ. Bruce Fields static dev_t last_dev; 879d911df7bSJ. Bruce Fields int err = 0; 880d911df7bSJ. Bruce Fields 881d911df7bSJ. Bruce Fields if (atomic_read(&inode->i_writecount) > 1 882d911df7bSJ. Bruce Fields || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 883d911df7bSJ. Bruce Fields dprintk("nfsd: write defer %d\n", task_pid_nr(current)); 884d911df7bSJ. Bruce Fields msleep(10); 885d911df7bSJ. Bruce Fields dprintk("nfsd: write resume %d\n", task_pid_nr(current)); 886d911df7bSJ. Bruce Fields } 887d911df7bSJ. Bruce Fields 888d911df7bSJ. Bruce Fields if (inode->i_state & I_DIRTY) { 889d911df7bSJ. Bruce Fields dprintk("nfsd: write sync %d\n", task_pid_nr(current)); 8908018ab05SChristoph Hellwig err = vfs_fsync(file, 0); 891d911df7bSJ. Bruce Fields } 892d911df7bSJ. Bruce Fields last_ino = inode->i_ino; 893d911df7bSJ. Bruce Fields last_dev = inode->i_sb->s_dev; 894d911df7bSJ. Bruce Fields return err; 895d911df7bSJ. Bruce Fields } 896d911df7bSJ. Bruce Fields 8976264d69dSAl Viro static __be32 8981da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 8991da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 90031dec253SDavid Shaw unsigned long *cnt, int *stablep) 9011da177e4SLinus Torvalds { 9021da177e4SLinus Torvalds struct svc_export *exp; 9031da177e4SLinus Torvalds struct dentry *dentry; 9041da177e4SLinus Torvalds struct inode *inode; 9051da177e4SLinus Torvalds mm_segment_t oldfs; 9066264d69dSAl Viro __be32 err = 0; 9076264d69dSAl Viro int host_err; 9081da177e4SLinus Torvalds int stable = *stablep; 90948e03bc5STrond Myklebust int use_wgather; 910e49dbbf3SKent Overstreet loff_t pos = offset; 911*8658452eSNeilBrown unsigned int pflags = current->flags; 912*8658452eSNeilBrown 913*8658452eSNeilBrown if (rqstp->rq_local) 914*8658452eSNeilBrown /* 915*8658452eSNeilBrown * We want less throttling in balance_dirty_pages() 916*8658452eSNeilBrown * and shrink_inactive_list() so that nfs to 917*8658452eSNeilBrown * localhost doesn't cause nfsd to lock up due to all 918*8658452eSNeilBrown * the client's dirty pages or its congested queue. 919*8658452eSNeilBrown */ 920*8658452eSNeilBrown current->flags |= PF_LESS_THROTTLE; 9211da177e4SLinus Torvalds 9227eaa36e2SJosef "Jeff" Sipek dentry = file->f_path.dentry; 9231da177e4SLinus Torvalds inode = dentry->d_inode; 9241da177e4SLinus Torvalds exp = fhp->fh_export; 9251da177e4SLinus Torvalds 92648e03bc5STrond Myklebust use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); 9271da177e4SLinus Torvalds 9281da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 9291da177e4SLinus Torvalds stable = 0; 9301da177e4SLinus Torvalds 9311da177e4SLinus Torvalds /* Write the data. */ 9321da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 933e49dbbf3SKent Overstreet host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &pos); 9341da177e4SLinus Torvalds set_fs(oldfs); 935e4636d53SJ. Bruce Fields if (host_err < 0) 936e4636d53SJ. Bruce Fields goto out_nfserr; 937a0d24b29SWei Yongjun *cnt = host_err; 93831dec253SDavid Shaw nfsdstats.io_write += host_err; 9392a12a9d7SEric Paris fsnotify_modify(file); 9401da177e4SLinus Torvalds 941face1502SJ. Bruce Fields if (stable) { 942face1502SJ. Bruce Fields if (use_wgather) 943d911df7bSJ. Bruce Fields host_err = wait_for_concurrent_writes(file); 944face1502SJ. Bruce Fields else 945face1502SJ. Bruce Fields host_err = vfs_fsync_range(file, offset, offset+*cnt, 0); 946face1502SJ. Bruce Fields } 9471da177e4SLinus Torvalds 948e4636d53SJ. Bruce Fields out_nfserr: 9496264d69dSAl Viro dprintk("nfsd: write complete host_err=%d\n", host_err); 950a0d24b29SWei Yongjun if (host_err >= 0) 9511da177e4SLinus Torvalds err = 0; 952a0d24b29SWei Yongjun else 9536264d69dSAl Viro err = nfserrno(host_err); 954*8658452eSNeilBrown if (rqstp->rq_local) 955*8658452eSNeilBrown tsk_restore_flags(current, pflags, PF_LESS_THROTTLE); 9561da177e4SLinus Torvalds return err; 9571da177e4SLinus Torvalds } 9581da177e4SLinus Torvalds 9591da177e4SLinus Torvalds /* 9601da177e4SLinus Torvalds * Read data from a file. count must contain the requested read count 9611da177e4SLinus Torvalds * on entry. On return, *count contains the number of bytes actually read. 9621da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 9631da177e4SLinus Torvalds */ 964039a87caSJ. Bruce Fields __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, 965fa0a2126SJ. Bruce Fields loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 966fa0a2126SJ. Bruce Fields { 967fa0a2126SJ. Bruce Fields struct file *file; 968fa0a2126SJ. Bruce Fields struct inode *inode; 969fa0a2126SJ. Bruce Fields struct raparms *ra; 970fa0a2126SJ. Bruce Fields __be32 err; 971fa0a2126SJ. Bruce Fields 972fa0a2126SJ. Bruce Fields err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 973fa0a2126SJ. Bruce Fields if (err) 974fa0a2126SJ. Bruce Fields return err; 975fa0a2126SJ. Bruce Fields 976496ad9aaSAl Viro inode = file_inode(file); 977fa0a2126SJ. Bruce Fields 978fa0a2126SJ. Bruce Fields /* Get readahead parameters */ 979fa0a2126SJ. Bruce Fields ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); 980fa0a2126SJ. Bruce Fields 981fa0a2126SJ. Bruce Fields if (ra && ra->p_set) 982fa0a2126SJ. Bruce Fields file->f_ra = ra->p_ra; 983fa0a2126SJ. Bruce Fields 984fa0a2126SJ. Bruce Fields err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 985fa0a2126SJ. Bruce Fields 986fa0a2126SJ. Bruce Fields /* Write back readahead params */ 987fa0a2126SJ. Bruce Fields if (ra) { 988fa0a2126SJ. Bruce Fields struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; 989fa0a2126SJ. Bruce Fields spin_lock(&rab->pb_lock); 990fa0a2126SJ. Bruce Fields ra->p_ra = file->f_ra; 991fa0a2126SJ. Bruce Fields ra->p_set = 1; 992fa0a2126SJ. Bruce Fields ra->p_count--; 993fa0a2126SJ. Bruce Fields spin_unlock(&rab->pb_lock); 994fa0a2126SJ. Bruce Fields } 995fa0a2126SJ. Bruce Fields 996fa0a2126SJ. Bruce Fields nfsd_close(file); 997fa0a2126SJ. Bruce Fields return err; 998fa0a2126SJ. Bruce Fields } 999fa0a2126SJ. Bruce Fields 1000039a87caSJ. Bruce Fields /* As above, but use the provided file descriptor. */ 10016264d69dSAl Viro __be32 1002039a87caSJ. Bruce Fields nfsd_read_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10031da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 10041da177e4SLinus Torvalds unsigned long *count) 10051da177e4SLinus Torvalds { 10066264d69dSAl Viro __be32 err; 10071da177e4SLinus Torvalds 10081da177e4SLinus Torvalds if (file) { 10090ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 10108837abcaSMiklos Szeredi NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); 10111da177e4SLinus Torvalds if (err) 10121da177e4SLinus Torvalds goto out; 10131da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 1014039a87caSJ. Bruce Fields } else /* Note file may still be NULL in NFSv4 special stateid case: */ 1015039a87caSJ. Bruce Fields err = nfsd_read(rqstp, fhp, offset, vec, vlen, count); 10161da177e4SLinus Torvalds out: 10171da177e4SLinus Torvalds return err; 10181da177e4SLinus Torvalds } 10191da177e4SLinus Torvalds 10201da177e4SLinus Torvalds /* 10211da177e4SLinus Torvalds * Write data to a file. 10221da177e4SLinus Torvalds * The stable flag requests synchronous writes. 10231da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10241da177e4SLinus Torvalds */ 10256264d69dSAl Viro __be32 10261da177e4SLinus Torvalds nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 102731dec253SDavid Shaw loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, 10281da177e4SLinus Torvalds int *stablep) 10291da177e4SLinus Torvalds { 10306264d69dSAl Viro __be32 err = 0; 10311da177e4SLinus Torvalds 10321da177e4SLinus Torvalds if (file) { 10330ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 10348837abcaSMiklos Szeredi NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); 10351da177e4SLinus Torvalds if (err) 10361da177e4SLinus Torvalds goto out; 10371da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, 10381da177e4SLinus Torvalds stablep); 10391da177e4SLinus Torvalds } else { 10408837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 10411da177e4SLinus Torvalds if (err) 10421da177e4SLinus Torvalds goto out; 10431da177e4SLinus Torvalds 10441da177e4SLinus Torvalds if (cnt) 10451da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, 10461da177e4SLinus Torvalds cnt, stablep); 10471da177e4SLinus Torvalds nfsd_close(file); 10481da177e4SLinus Torvalds } 10491da177e4SLinus Torvalds out: 10501da177e4SLinus Torvalds return err; 10511da177e4SLinus Torvalds } 10521da177e4SLinus Torvalds 10531da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 10541da177e4SLinus Torvalds /* 10551da177e4SLinus Torvalds * Commit all pending writes to stable storage. 1056aa696a6fSTrond Myklebust * 1057aa696a6fSTrond Myklebust * Note: we only guarantee that data that lies within the range specified 1058aa696a6fSTrond Myklebust * by the 'offset' and 'count' parameters will be synced. 10591da177e4SLinus Torvalds * 10601da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 10611da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 10621da177e4SLinus Torvalds */ 10636264d69dSAl Viro __be32 10641da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 10651da177e4SLinus Torvalds loff_t offset, unsigned long count) 10661da177e4SLinus Torvalds { 10671da177e4SLinus Torvalds struct file *file; 1068aa696a6fSTrond Myklebust loff_t end = LLONG_MAX; 1069aa696a6fSTrond Myklebust __be32 err = nfserr_inval; 10701da177e4SLinus Torvalds 1071aa696a6fSTrond Myklebust if (offset < 0) 1072aa696a6fSTrond Myklebust goto out; 1073aa696a6fSTrond Myklebust if (count != 0) { 1074aa696a6fSTrond Myklebust end = offset + (loff_t)count - 1; 1075aa696a6fSTrond Myklebust if (end < offset) 1076aa696a6fSTrond Myklebust goto out; 1077aa696a6fSTrond Myklebust } 10781da177e4SLinus Torvalds 107991885258SJeff Layton err = nfsd_open(rqstp, fhp, S_IFREG, 108091885258SJeff Layton NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file); 10818837abcaSMiklos Szeredi if (err) 1082aa696a6fSTrond Myklebust goto out; 10831da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 10848018ab05SChristoph Hellwig int err2 = vfs_fsync_range(file, offset, end, 0); 1085aa696a6fSTrond Myklebust 1086aa696a6fSTrond Myklebust if (err2 != -EINVAL) 1087aa696a6fSTrond Myklebust err = nfserrno(err2); 1088aa696a6fSTrond Myklebust else 10891da177e4SLinus Torvalds err = nfserr_notsupp; 10901da177e4SLinus Torvalds } 10911da177e4SLinus Torvalds 10921da177e4SLinus Torvalds nfsd_close(file); 1093aa696a6fSTrond Myklebust out: 10941da177e4SLinus Torvalds return err; 10951da177e4SLinus Torvalds } 10961da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 10971da177e4SLinus Torvalds 1098f2b0dee2SAdrian Bunk static __be32 10995c002b3bSJ. Bruce Fields nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, 11005c002b3bSJ. Bruce Fields struct iattr *iap) 11015c002b3bSJ. Bruce Fields { 11025c002b3bSJ. Bruce Fields /* 11035c002b3bSJ. Bruce Fields * Mode has already been set earlier in create: 11045c002b3bSJ. Bruce Fields */ 11055c002b3bSJ. Bruce Fields iap->ia_valid &= ~ATTR_MODE; 11065c002b3bSJ. Bruce Fields /* 11075c002b3bSJ. Bruce Fields * Setting uid/gid works only for root. Irix appears to 11085c002b3bSJ. Bruce Fields * send along the gid on create when it tries to implement 11095c002b3bSJ. Bruce Fields * setgid directories via NFS: 11105c002b3bSJ. Bruce Fields */ 11116fab8779SEric W. Biederman if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) 11125c002b3bSJ. Bruce Fields iap->ia_valid &= ~(ATTR_UID|ATTR_GID); 11135c002b3bSJ. Bruce Fields if (iap->ia_valid) 11145c002b3bSJ. Bruce Fields return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 11155c002b3bSJ. Bruce Fields return 0; 11165c002b3bSJ. Bruce Fields } 11175c002b3bSJ. Bruce Fields 11184ac35c2fSwengang wang /* HPUX client sometimes creates a file in mode 000, and sets size to 0. 11194ac35c2fSwengang wang * setting size to 0 may fail for some specific file systems by the permission 11204ac35c2fSwengang wang * checking which requires WRITE permission but the mode is 000. 11214ac35c2fSwengang wang * we ignore the resizing(to 0) on the just new created file, since the size is 11224ac35c2fSwengang wang * 0 after file created. 11234ac35c2fSwengang wang * 11244ac35c2fSwengang wang * call this only after vfs_create() is called. 11254ac35c2fSwengang wang * */ 11264ac35c2fSwengang wang static void 11274ac35c2fSwengang wang nfsd_check_ignore_resizing(struct iattr *iap) 11284ac35c2fSwengang wang { 11294ac35c2fSwengang wang if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) 11304ac35c2fSwengang wang iap->ia_valid &= ~ATTR_SIZE; 11314ac35c2fSwengang wang } 11324ac35c2fSwengang wang 11331da177e4SLinus Torvalds /* 11341da177e4SLinus Torvalds * Create a file (regular, directory, device, fifo); UNIX sockets 11351da177e4SLinus Torvalds * not yet implemented. 11361da177e4SLinus Torvalds * If the response fh has been verified, the parent directory should 11371da177e4SLinus Torvalds * already be locked. Note that the parent directory is left locked. 11381da177e4SLinus Torvalds * 11391da177e4SLinus Torvalds * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 11401da177e4SLinus Torvalds */ 11416264d69dSAl Viro __be32 11421da177e4SLinus Torvalds nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 11431da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 11441da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 11451da177e4SLinus Torvalds { 11461da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 11471da177e4SLinus Torvalds struct inode *dirp; 11486264d69dSAl Viro __be32 err; 11495c002b3bSJ. Bruce Fields __be32 err2; 11506264d69dSAl Viro int host_err; 11511da177e4SLinus Torvalds 11521da177e4SLinus Torvalds err = nfserr_perm; 11531da177e4SLinus Torvalds if (!flen) 11541da177e4SLinus Torvalds goto out; 11551da177e4SLinus Torvalds err = nfserr_exist; 11561da177e4SLinus Torvalds if (isdotent(fname, flen)) 11571da177e4SLinus Torvalds goto out; 11581da177e4SLinus Torvalds 11598837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 11601da177e4SLinus Torvalds if (err) 11611da177e4SLinus Torvalds goto out; 11621da177e4SLinus Torvalds 11631da177e4SLinus Torvalds dentry = fhp->fh_dentry; 11641da177e4SLinus Torvalds dirp = dentry->d_inode; 11651da177e4SLinus Torvalds 11661da177e4SLinus Torvalds err = nfserr_notdir; 1167acfa4380SAl Viro if (!dirp->i_op->lookup) 11681da177e4SLinus Torvalds goto out; 11691da177e4SLinus Torvalds /* 11701da177e4SLinus Torvalds * Check whether the response file handle has been verified yet. 11711da177e4SLinus Torvalds * If it has, the parent directory should already be locked. 11721da177e4SLinus Torvalds */ 11731da177e4SLinus Torvalds if (!resfhp->fh_dentry) { 11744a55c101SJan Kara host_err = fh_want_write(fhp); 11754a55c101SJan Kara if (host_err) 11764a55c101SJan Kara goto out_nfserr; 11774a55c101SJan Kara 11781da177e4SLinus Torvalds /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ 117912fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 11801da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 11816264d69dSAl Viro host_err = PTR_ERR(dchild); 11821da177e4SLinus Torvalds if (IS_ERR(dchild)) 11831da177e4SLinus Torvalds goto out_nfserr; 11841da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 11851da177e4SLinus Torvalds if (err) 11861da177e4SLinus Torvalds goto out; 11871da177e4SLinus Torvalds } else { 11881da177e4SLinus Torvalds /* called from nfsd_proc_create */ 11891da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 11901da177e4SLinus Torvalds if (!fhp->fh_locked) { 11911da177e4SLinus Torvalds /* not actually possible */ 11921da177e4SLinus Torvalds printk(KERN_ERR 1193a6a9f18fSAl Viro "nfsd_create: parent %pd2 not locked!\n", 1194a6a9f18fSAl Viro dentry); 1195d75f2b9fSAl Viro err = nfserr_io; 11961da177e4SLinus Torvalds goto out; 11971da177e4SLinus Torvalds } 11981da177e4SLinus Torvalds } 11991da177e4SLinus Torvalds /* 12001da177e4SLinus Torvalds * Make sure the child dentry is still negative ... 12011da177e4SLinus Torvalds */ 12021da177e4SLinus Torvalds err = nfserr_exist; 12031da177e4SLinus Torvalds if (dchild->d_inode) { 1204a6a9f18fSAl Viro dprintk("nfsd_create: dentry %pd/%pd not negative!\n", 1205a6a9f18fSAl Viro dentry, dchild); 12061da177e4SLinus Torvalds goto out; 12071da177e4SLinus Torvalds } 12081da177e4SLinus Torvalds 12091da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 12101da177e4SLinus Torvalds iap->ia_mode = 0; 12111da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 12121da177e4SLinus Torvalds 121307cad1d2SMiklos Szeredi err = nfserr_inval; 121407cad1d2SMiklos Szeredi if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { 121507cad1d2SMiklos Szeredi printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", 121607cad1d2SMiklos Szeredi type); 121707cad1d2SMiklos Szeredi goto out; 121807cad1d2SMiklos Szeredi } 121907cad1d2SMiklos Szeredi 12201da177e4SLinus Torvalds /* 12211da177e4SLinus Torvalds * Get the dir op function pointer. 12221da177e4SLinus Torvalds */ 1223088406bcSJ. Bruce Fields err = 0; 12244a55c101SJan Kara host_err = 0; 12251da177e4SLinus Torvalds switch (type) { 12261da177e4SLinus Torvalds case S_IFREG: 1227312b63fbSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, true); 12284ac35c2fSwengang wang if (!host_err) 12294ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 12301da177e4SLinus Torvalds break; 12311da177e4SLinus Torvalds case S_IFDIR: 12326264d69dSAl Viro host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); 12331da177e4SLinus Torvalds break; 12341da177e4SLinus Torvalds case S_IFCHR: 12351da177e4SLinus Torvalds case S_IFBLK: 12361da177e4SLinus Torvalds case S_IFIFO: 12371da177e4SLinus Torvalds case S_IFSOCK: 12386264d69dSAl Viro host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 12391da177e4SLinus Torvalds break; 1240463c3197SDave Hansen } 12414a55c101SJan Kara if (host_err < 0) 1242463c3197SDave Hansen goto out_nfserr; 12431da177e4SLinus Torvalds 1244f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 12451da177e4SLinus Torvalds 1246f501912aSBen Myers /* 1247f501912aSBen Myers * nfsd_setattr already committed the child. Transactional filesystems 1248f501912aSBen Myers * had a chance to commit changes for both parent and child 1249f501912aSBen Myers * simultaneously making the following commit_metadata a noop. 1250f501912aSBen Myers */ 1251f501912aSBen Myers err2 = nfserrno(commit_metadata(fhp)); 1252f193fbabSYAMAMOTO Takashi if (err2) 1253f193fbabSYAMAMOTO Takashi err = err2; 12541da177e4SLinus Torvalds /* 12551da177e4SLinus Torvalds * Update the file handle to get the new inode info. 12561da177e4SLinus Torvalds */ 12571da177e4SLinus Torvalds if (!err) 12581da177e4SLinus Torvalds err = fh_update(resfhp); 12591da177e4SLinus Torvalds out: 12601da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 12611da177e4SLinus Torvalds dput(dchild); 12621da177e4SLinus Torvalds return err; 12631da177e4SLinus Torvalds 12641da177e4SLinus Torvalds out_nfserr: 12656264d69dSAl Viro err = nfserrno(host_err); 12661da177e4SLinus Torvalds goto out; 12671da177e4SLinus Torvalds } 12681da177e4SLinus Torvalds 12691da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 1270ac6721a1SMi Jinlong 1271ac6721a1SMi Jinlong static inline int nfsd_create_is_exclusive(int createmode) 1272ac6721a1SMi Jinlong { 1273ac6721a1SMi Jinlong return createmode == NFS3_CREATE_EXCLUSIVE 1274ac6721a1SMi Jinlong || createmode == NFS4_CREATE_EXCLUSIVE4_1; 1275ac6721a1SMi Jinlong } 1276ac6721a1SMi Jinlong 12771da177e4SLinus Torvalds /* 1278ac6721a1SMi Jinlong * NFSv3 and NFSv4 version of nfsd_create 12791da177e4SLinus Torvalds */ 12806264d69dSAl Viro __be32 1281ac6721a1SMi Jinlong do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 12821da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 12831da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 1284856121b2SJ. Bruce Fields bool *truncp, bool *created) 12851da177e4SLinus Torvalds { 12861da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 12871da177e4SLinus Torvalds struct inode *dirp; 12886264d69dSAl Viro __be32 err; 12896264d69dSAl Viro int host_err; 12901da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 12911da177e4SLinus Torvalds 12921da177e4SLinus Torvalds err = nfserr_perm; 12931da177e4SLinus Torvalds if (!flen) 12941da177e4SLinus Torvalds goto out; 12951da177e4SLinus Torvalds err = nfserr_exist; 12961da177e4SLinus Torvalds if (isdotent(fname, flen)) 12971da177e4SLinus Torvalds goto out; 12981da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 12991da177e4SLinus Torvalds iap->ia_mode = 0; 13001574dff8SSachin Prabhu err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 13011da177e4SLinus Torvalds if (err) 13021da177e4SLinus Torvalds goto out; 13031da177e4SLinus Torvalds 13041da177e4SLinus Torvalds dentry = fhp->fh_dentry; 13051da177e4SLinus Torvalds dirp = dentry->d_inode; 13061da177e4SLinus Torvalds 13071da177e4SLinus Torvalds /* Get all the sanity checks out of the way before 13081da177e4SLinus Torvalds * we lock the parent. */ 13091da177e4SLinus Torvalds err = nfserr_notdir; 1310acfa4380SAl Viro if (!dirp->i_op->lookup) 13111da177e4SLinus Torvalds goto out; 13124a55c101SJan Kara 13134a55c101SJan Kara host_err = fh_want_write(fhp); 13144a55c101SJan Kara if (host_err) 13154a55c101SJan Kara goto out_nfserr; 13164a55c101SJan Kara 131712fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 13181da177e4SLinus Torvalds 13191da177e4SLinus Torvalds /* 13201da177e4SLinus Torvalds * Compose the response file handle. 13211da177e4SLinus Torvalds */ 13221da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 13236264d69dSAl Viro host_err = PTR_ERR(dchild); 13241da177e4SLinus Torvalds if (IS_ERR(dchild)) 13251da177e4SLinus Torvalds goto out_nfserr; 13261da177e4SLinus Torvalds 13271574dff8SSachin Prabhu /* If file doesn't exist, check for permissions to create one */ 13281574dff8SSachin Prabhu if (!dchild->d_inode) { 13291574dff8SSachin Prabhu err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 13301574dff8SSachin Prabhu if (err) 13311574dff8SSachin Prabhu goto out; 13321574dff8SSachin Prabhu } 13331574dff8SSachin Prabhu 13341da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 13351da177e4SLinus Torvalds if (err) 13361da177e4SLinus Torvalds goto out; 13371da177e4SLinus Torvalds 1338ac6721a1SMi Jinlong if (nfsd_create_is_exclusive(createmode)) { 1339c397852cSPeter Staubach /* solaris7 gets confused (bugid 4218508) if these have 1340749997e5SJeff Layton * the high bit set, so just clear the high bits. If this is 1341749997e5SJeff Layton * ever changed to use different attrs for storing the 1342749997e5SJeff Layton * verifier, then do_open_lookup() will also need to be fixed 1343749997e5SJeff Layton * accordingly. 13441da177e4SLinus Torvalds */ 13451da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 13461da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 13471da177e4SLinus Torvalds } 13481da177e4SLinus Torvalds 13491da177e4SLinus Torvalds if (dchild->d_inode) { 13501da177e4SLinus Torvalds err = 0; 13511da177e4SLinus Torvalds 13521da177e4SLinus Torvalds switch (createmode) { 13531da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 13541da177e4SLinus Torvalds if (! S_ISREG(dchild->d_inode->i_mode)) 13559dc4e6c4SJ. Bruce Fields goto out; 13561da177e4SLinus Torvalds else if (truncp) { 13571da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 13581da177e4SLinus Torvalds * differently. we don't want to truncate the 13591da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 13601da177e4SLinus Torvalds * fails for some other reason. furthermore, 13611da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 13621da177e4SLinus Torvalds * according to spec! 13631da177e4SLinus Torvalds */ 13641da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 13651da177e4SLinus Torvalds } 13661da177e4SLinus Torvalds else { 13671da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 13681da177e4SLinus Torvalds goto set_attr; 13691da177e4SLinus Torvalds } 13701da177e4SLinus Torvalds break; 13711da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 13721da177e4SLinus Torvalds if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 13731da177e4SLinus Torvalds && dchild->d_inode->i_atime.tv_sec == v_atime 13747007c90fSNeil Brown && dchild->d_inode->i_size == 0 ) { 13757007c90fSNeil Brown if (created) 13767007c90fSNeil Brown *created = 1; 13771da177e4SLinus Torvalds break; 13787007c90fSNeil Brown } 1379ac6721a1SMi Jinlong case NFS4_CREATE_EXCLUSIVE4_1: 1380ac6721a1SMi Jinlong if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 1381ac6721a1SMi Jinlong && dchild->d_inode->i_atime.tv_sec == v_atime 13827007c90fSNeil Brown && dchild->d_inode->i_size == 0 ) { 13837007c90fSNeil Brown if (created) 13847007c90fSNeil Brown *created = 1; 1385ac6721a1SMi Jinlong goto set_attr; 13867007c90fSNeil Brown } 13871da177e4SLinus Torvalds /* fallthru */ 13881da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 13891da177e4SLinus Torvalds err = nfserr_exist; 13901da177e4SLinus Torvalds } 1391bad0dcffSAl Viro fh_drop_write(fhp); 13921da177e4SLinus Torvalds goto out; 13931da177e4SLinus Torvalds } 13941da177e4SLinus Torvalds 1395312b63fbSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, true); 1396463c3197SDave Hansen if (host_err < 0) { 1397bad0dcffSAl Viro fh_drop_write(fhp); 13981da177e4SLinus Torvalds goto out_nfserr; 1399463c3197SDave Hansen } 140081ac95c5SJ. Bruce Fields if (created) 140181ac95c5SJ. Bruce Fields *created = 1; 14021da177e4SLinus Torvalds 14034ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 14044ac35c2fSwengang wang 1405ac6721a1SMi Jinlong if (nfsd_create_is_exclusive(createmode)) { 1406c397852cSPeter Staubach /* Cram the verifier into atime/mtime */ 14071da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 1408c397852cSPeter Staubach | ATTR_MTIME_SET|ATTR_ATIME_SET; 14091da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 14101da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 14111da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 14121da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 14131da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 14141da177e4SLinus Torvalds } 14151da177e4SLinus Torvalds 14161da177e4SLinus Torvalds set_attr: 1417f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 1418f501912aSBen Myers 1419f501912aSBen Myers /* 1420f501912aSBen Myers * nfsd_setattr already committed the child (and possibly also the parent). 1421f501912aSBen Myers */ 1422f501912aSBen Myers if (!err) 1423f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 1424f193fbabSYAMAMOTO Takashi 1425f193fbabSYAMAMOTO Takashi /* 1426f193fbabSYAMAMOTO Takashi * Update the filehandle to get the new inode info. 1427f193fbabSYAMAMOTO Takashi */ 1428f193fbabSYAMAMOTO Takashi if (!err) 1429f193fbabSYAMAMOTO Takashi err = fh_update(resfhp); 14301da177e4SLinus Torvalds 14311da177e4SLinus Torvalds out: 14321da177e4SLinus Torvalds fh_unlock(fhp); 14331da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 14341da177e4SLinus Torvalds dput(dchild); 14354a55c101SJan Kara fh_drop_write(fhp); 14361da177e4SLinus Torvalds return err; 14371da177e4SLinus Torvalds 14381da177e4SLinus Torvalds out_nfserr: 14396264d69dSAl Viro err = nfserrno(host_err); 14401da177e4SLinus Torvalds goto out; 14411da177e4SLinus Torvalds } 14421da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 14431da177e4SLinus Torvalds 14441da177e4SLinus Torvalds /* 14451da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 14461da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 14471da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 14481da177e4SLinus Torvalds */ 14496264d69dSAl Viro __be32 14501da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 14511da177e4SLinus Torvalds { 14521da177e4SLinus Torvalds struct inode *inode; 14531da177e4SLinus Torvalds mm_segment_t oldfs; 14546264d69dSAl Viro __be32 err; 14556264d69dSAl Viro int host_err; 145668ac1234SAl Viro struct path path; 14571da177e4SLinus Torvalds 14588837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); 14591da177e4SLinus Torvalds if (err) 14601da177e4SLinus Torvalds goto out; 14611da177e4SLinus Torvalds 146268ac1234SAl Viro path.mnt = fhp->fh_export->ex_path.mnt; 146368ac1234SAl Viro path.dentry = fhp->fh_dentry; 146468ac1234SAl Viro inode = path.dentry->d_inode; 14651da177e4SLinus Torvalds 14661da177e4SLinus Torvalds err = nfserr_inval; 1467acfa4380SAl Viro if (!inode->i_op->readlink) 14681da177e4SLinus Torvalds goto out; 14691da177e4SLinus Torvalds 147068ac1234SAl Viro touch_atime(&path); 14711da177e4SLinus Torvalds /* N.B. Why does this call need a get_fs()?? 14721da177e4SLinus Torvalds * Remove the set_fs and watch the fireworks:-) --okir 14731da177e4SLinus Torvalds */ 14741da177e4SLinus Torvalds 14751da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 1476fac7a17bSJ. Bruce Fields host_err = inode->i_op->readlink(path.dentry, (char __user *)buf, *lenp); 14771da177e4SLinus Torvalds set_fs(oldfs); 14781da177e4SLinus Torvalds 14796264d69dSAl Viro if (host_err < 0) 14801da177e4SLinus Torvalds goto out_nfserr; 14816264d69dSAl Viro *lenp = host_err; 14821da177e4SLinus Torvalds err = 0; 14831da177e4SLinus Torvalds out: 14841da177e4SLinus Torvalds return err; 14851da177e4SLinus Torvalds 14861da177e4SLinus Torvalds out_nfserr: 14876264d69dSAl Viro err = nfserrno(host_err); 14881da177e4SLinus Torvalds goto out; 14891da177e4SLinus Torvalds } 14901da177e4SLinus Torvalds 14911da177e4SLinus Torvalds /* 14921da177e4SLinus Torvalds * Create a symlink and look up its inode 14931da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 14941da177e4SLinus Torvalds */ 14956264d69dSAl Viro __be32 14961da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 14971da177e4SLinus Torvalds char *fname, int flen, 14981da177e4SLinus Torvalds char *path, int plen, 14991da177e4SLinus Torvalds struct svc_fh *resfhp, 15001da177e4SLinus Torvalds struct iattr *iap) 15011da177e4SLinus Torvalds { 15021da177e4SLinus Torvalds struct dentry *dentry, *dnew; 15036264d69dSAl Viro __be32 err, cerr; 15046264d69dSAl Viro int host_err; 15051da177e4SLinus Torvalds 15061da177e4SLinus Torvalds err = nfserr_noent; 15071da177e4SLinus Torvalds if (!flen || !plen) 15081da177e4SLinus Torvalds goto out; 15091da177e4SLinus Torvalds err = nfserr_exist; 15101da177e4SLinus Torvalds if (isdotent(fname, flen)) 15111da177e4SLinus Torvalds goto out; 15121da177e4SLinus Torvalds 15138837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 15141da177e4SLinus Torvalds if (err) 15151da177e4SLinus Torvalds goto out; 15164a55c101SJan Kara 15174a55c101SJan Kara host_err = fh_want_write(fhp); 15184a55c101SJan Kara if (host_err) 15194a55c101SJan Kara goto out_nfserr; 15204a55c101SJan Kara 15211da177e4SLinus Torvalds fh_lock(fhp); 15221da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15231da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 15246264d69dSAl Viro host_err = PTR_ERR(dnew); 15251da177e4SLinus Torvalds if (IS_ERR(dnew)) 15261da177e4SLinus Torvalds goto out_nfserr; 15271da177e4SLinus Torvalds 15281da177e4SLinus Torvalds if (unlikely(path[plen] != 0)) { 15291da177e4SLinus Torvalds char *path_alloced = kmalloc(plen+1, GFP_KERNEL); 15301da177e4SLinus Torvalds if (path_alloced == NULL) 15316264d69dSAl Viro host_err = -ENOMEM; 15321da177e4SLinus Torvalds else { 15331da177e4SLinus Torvalds strncpy(path_alloced, path, plen); 15341da177e4SLinus Torvalds path_alloced[plen] = 0; 1535db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); 15361da177e4SLinus Torvalds kfree(path_alloced); 15371da177e4SLinus Torvalds } 15381da177e4SLinus Torvalds } else 1539db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path); 15406264d69dSAl Viro err = nfserrno(host_err); 1541f501912aSBen Myers if (!err) 1542f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 15431da177e4SLinus Torvalds fh_unlock(fhp); 15441da177e4SLinus Torvalds 1545bad0dcffSAl Viro fh_drop_write(fhp); 154675c3f29dSDave Hansen 15471da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 15481da177e4SLinus Torvalds dput(dnew); 15491da177e4SLinus Torvalds if (err==0) err = cerr; 15501da177e4SLinus Torvalds out: 15511da177e4SLinus Torvalds return err; 15521da177e4SLinus Torvalds 15531da177e4SLinus Torvalds out_nfserr: 15546264d69dSAl Viro err = nfserrno(host_err); 15551da177e4SLinus Torvalds goto out; 15561da177e4SLinus Torvalds } 15571da177e4SLinus Torvalds 15581da177e4SLinus Torvalds /* 15591da177e4SLinus Torvalds * Create a hardlink 15601da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 15611da177e4SLinus Torvalds */ 15626264d69dSAl Viro __be32 15631da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 15641da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 15651da177e4SLinus Torvalds { 15661da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 156755b13354SJ. Bruce Fields struct inode *dirp; 15686264d69dSAl Viro __be32 err; 15696264d69dSAl Viro int host_err; 15701da177e4SLinus Torvalds 15718837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); 15721da177e4SLinus Torvalds if (err) 15731da177e4SLinus Torvalds goto out; 15747d818a7bSJ. Bruce Fields err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); 15751da177e4SLinus Torvalds if (err) 15761da177e4SLinus Torvalds goto out; 15777d818a7bSJ. Bruce Fields err = nfserr_isdir; 15787d818a7bSJ. Bruce Fields if (S_ISDIR(tfhp->fh_dentry->d_inode->i_mode)) 15797d818a7bSJ. Bruce Fields goto out; 15801da177e4SLinus Torvalds err = nfserr_perm; 15811da177e4SLinus Torvalds if (!len) 15821da177e4SLinus Torvalds goto out; 15831da177e4SLinus Torvalds err = nfserr_exist; 15841da177e4SLinus Torvalds if (isdotent(name, len)) 15851da177e4SLinus Torvalds goto out; 15861da177e4SLinus Torvalds 15874a55c101SJan Kara host_err = fh_want_write(tfhp); 15884a55c101SJan Kara if (host_err) { 15894a55c101SJan Kara err = nfserrno(host_err); 15904a55c101SJan Kara goto out; 15914a55c101SJan Kara } 15924a55c101SJan Kara 159312fd3520SPeter Zijlstra fh_lock_nested(ffhp, I_MUTEX_PARENT); 15941da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 15951da177e4SLinus Torvalds dirp = ddir->d_inode; 15961da177e4SLinus Torvalds 15971da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 15986264d69dSAl Viro host_err = PTR_ERR(dnew); 15991da177e4SLinus Torvalds if (IS_ERR(dnew)) 16001da177e4SLinus Torvalds goto out_nfserr; 16011da177e4SLinus Torvalds 16021da177e4SLinus Torvalds dold = tfhp->fh_dentry; 16031da177e4SLinus Torvalds 16044795bb37SJ. Bruce Fields err = nfserr_noent; 16054795bb37SJ. Bruce Fields if (!dold->d_inode) 16064a55c101SJan Kara goto out_dput; 1607146a8595SJ. Bruce Fields host_err = vfs_link(dold, dirp, dnew, NULL); 16086264d69dSAl Viro if (!host_err) { 1609f501912aSBen Myers err = nfserrno(commit_metadata(ffhp)); 1610f501912aSBen Myers if (!err) 1611f501912aSBen Myers err = nfserrno(commit_metadata(tfhp)); 16121da177e4SLinus Torvalds } else { 16136264d69dSAl Viro if (host_err == -EXDEV && rqstp->rq_vers == 2) 16141da177e4SLinus Torvalds err = nfserr_acces; 16151da177e4SLinus Torvalds else 16166264d69dSAl Viro err = nfserrno(host_err); 16171da177e4SLinus Torvalds } 161875c3f29dSDave Hansen out_dput: 16191da177e4SLinus Torvalds dput(dnew); 1620270d56e5SDavid M. Richter out_unlock: 1621270d56e5SDavid M. Richter fh_unlock(ffhp); 16224a55c101SJan Kara fh_drop_write(tfhp); 16231da177e4SLinus Torvalds out: 16241da177e4SLinus Torvalds return err; 16251da177e4SLinus Torvalds 16261da177e4SLinus Torvalds out_nfserr: 16276264d69dSAl Viro err = nfserrno(host_err); 1628270d56e5SDavid M. Richter goto out_unlock; 16291da177e4SLinus Torvalds } 16301da177e4SLinus Torvalds 16311da177e4SLinus Torvalds /* 16321da177e4SLinus Torvalds * Rename a file 16331da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16341da177e4SLinus Torvalds */ 16356264d69dSAl Viro __be32 16361da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 16371da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 16381da177e4SLinus Torvalds { 16391da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 16401da177e4SLinus Torvalds struct inode *fdir, *tdir; 16416264d69dSAl Viro __be32 err; 16426264d69dSAl Viro int host_err; 16431da177e4SLinus Torvalds 16448837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); 16451da177e4SLinus Torvalds if (err) 16461da177e4SLinus Torvalds goto out; 16478837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); 16481da177e4SLinus Torvalds if (err) 16491da177e4SLinus Torvalds goto out; 16501da177e4SLinus Torvalds 16511da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 16521da177e4SLinus Torvalds fdir = fdentry->d_inode; 16531da177e4SLinus Torvalds 16541da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 16551da177e4SLinus Torvalds tdir = tdentry->d_inode; 16561da177e4SLinus Torvalds 16571da177e4SLinus Torvalds err = nfserr_perm; 16581da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 16591da177e4SLinus Torvalds goto out; 16601da177e4SLinus Torvalds 16614a55c101SJan Kara host_err = fh_want_write(ffhp); 16624a55c101SJan Kara if (host_err) { 16634a55c101SJan Kara err = nfserrno(host_err); 16644a55c101SJan Kara goto out; 16654a55c101SJan Kara } 16664a55c101SJan Kara 16671da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 16681da177e4SLinus Torvalds * so do it by hand */ 16691da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 16701da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 1; 16711da177e4SLinus Torvalds fill_pre_wcc(ffhp); 16721da177e4SLinus Torvalds fill_pre_wcc(tfhp); 16731da177e4SLinus Torvalds 16741da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 16756264d69dSAl Viro host_err = PTR_ERR(odentry); 16761da177e4SLinus Torvalds if (IS_ERR(odentry)) 16771da177e4SLinus Torvalds goto out_nfserr; 16781da177e4SLinus Torvalds 16796264d69dSAl Viro host_err = -ENOENT; 16801da177e4SLinus Torvalds if (!odentry->d_inode) 16811da177e4SLinus Torvalds goto out_dput_old; 16826264d69dSAl Viro host_err = -EINVAL; 16831da177e4SLinus Torvalds if (odentry == trap) 16841da177e4SLinus Torvalds goto out_dput_old; 16851da177e4SLinus Torvalds 16861da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 16876264d69dSAl Viro host_err = PTR_ERR(ndentry); 16881da177e4SLinus Torvalds if (IS_ERR(ndentry)) 16891da177e4SLinus Torvalds goto out_dput_old; 16906264d69dSAl Viro host_err = -ENOTEMPTY; 16911da177e4SLinus Torvalds if (ndentry == trap) 16921da177e4SLinus Torvalds goto out_dput_new; 16931da177e4SLinus Torvalds 16949079b1ebSDave Hansen host_err = -EXDEV; 16959079b1ebSDave Hansen if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) 16969079b1ebSDave Hansen goto out_dput_new; 1697aa387d6cSJ. Bruce Fields if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry) 1698aa387d6cSJ. Bruce Fields goto out_dput_new; 16999079b1ebSDave Hansen 1700520c8b16SMiklos Szeredi host_err = vfs_rename(fdir, odentry, tdir, ndentry, NULL, 0); 1701f501912aSBen Myers if (!host_err) { 1702f501912aSBen Myers host_err = commit_metadata(tfhp); 17036264d69dSAl Viro if (!host_err) 1704f501912aSBen Myers host_err = commit_metadata(ffhp); 17051da177e4SLinus Torvalds } 17061da177e4SLinus Torvalds out_dput_new: 17071da177e4SLinus Torvalds dput(ndentry); 17081da177e4SLinus Torvalds out_dput_old: 17091da177e4SLinus Torvalds dput(odentry); 17101da177e4SLinus Torvalds out_nfserr: 17116264d69dSAl Viro err = nfserrno(host_err); 1712fbb74a34SJ. Bruce Fields /* 1713fbb74a34SJ. Bruce Fields * We cannot rely on fh_unlock on the two filehandles, 17141da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 1715fbb74a34SJ. Bruce Fields * were the same, so again we do it by hand. 17161da177e4SLinus Torvalds */ 17171da177e4SLinus Torvalds fill_post_wcc(ffhp); 17181da177e4SLinus Torvalds fill_post_wcc(tfhp); 17191da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 17201da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 0; 17214a55c101SJan Kara fh_drop_write(ffhp); 17221da177e4SLinus Torvalds 17231da177e4SLinus Torvalds out: 17241da177e4SLinus Torvalds return err; 17251da177e4SLinus Torvalds } 17261da177e4SLinus Torvalds 17271da177e4SLinus Torvalds /* 17281da177e4SLinus Torvalds * Unlink a file or directory 17291da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 17301da177e4SLinus Torvalds */ 17316264d69dSAl Viro __be32 17321da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 17331da177e4SLinus Torvalds char *fname, int flen) 17341da177e4SLinus Torvalds { 17351da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 17361da177e4SLinus Torvalds struct inode *dirp; 17376264d69dSAl Viro __be32 err; 17386264d69dSAl Viro int host_err; 17391da177e4SLinus Torvalds 17401da177e4SLinus Torvalds err = nfserr_acces; 17411da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 17421da177e4SLinus Torvalds goto out; 17438837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); 17441da177e4SLinus Torvalds if (err) 17451da177e4SLinus Torvalds goto out; 17461da177e4SLinus Torvalds 17474a55c101SJan Kara host_err = fh_want_write(fhp); 17484a55c101SJan Kara if (host_err) 17494a55c101SJan Kara goto out_nfserr; 17504a55c101SJan Kara 175112fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 17521da177e4SLinus Torvalds dentry = fhp->fh_dentry; 17531da177e4SLinus Torvalds dirp = dentry->d_inode; 17541da177e4SLinus Torvalds 17551da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 17566264d69dSAl Viro host_err = PTR_ERR(rdentry); 17571da177e4SLinus Torvalds if (IS_ERR(rdentry)) 17581da177e4SLinus Torvalds goto out_nfserr; 17591da177e4SLinus Torvalds 17601da177e4SLinus Torvalds if (!rdentry->d_inode) { 17611da177e4SLinus Torvalds dput(rdentry); 17621da177e4SLinus Torvalds err = nfserr_noent; 17631da177e4SLinus Torvalds goto out; 17641da177e4SLinus Torvalds } 17651da177e4SLinus Torvalds 17661da177e4SLinus Torvalds if (!type) 17671da177e4SLinus Torvalds type = rdentry->d_inode->i_mode & S_IFMT; 17681da177e4SLinus Torvalds 17699ce137eeSJ. Bruce Fields if (type != S_IFDIR) 1770b21996e3SJ. Bruce Fields host_err = vfs_unlink(dirp, rdentry, NULL); 17719ce137eeSJ. Bruce Fields else 17726264d69dSAl Viro host_err = vfs_rmdir(dirp, rdentry); 1773541ce98cSJ. Bruce Fields if (!host_err) 1774541ce98cSJ. Bruce Fields host_err = commit_metadata(fhp); 17751da177e4SLinus Torvalds dput(rdentry); 17761da177e4SLinus Torvalds 17771da177e4SLinus Torvalds out_nfserr: 17786264d69dSAl Viro err = nfserrno(host_err); 1779f193fbabSYAMAMOTO Takashi out: 1780f193fbabSYAMAMOTO Takashi return err; 17811da177e4SLinus Torvalds } 17821da177e4SLinus Torvalds 17831da177e4SLinus Torvalds /* 178414f7dd63SDavid Woodhouse * We do this buffering because we must not call back into the file 178514f7dd63SDavid Woodhouse * system's ->lookup() method from the filldir callback. That may well 178614f7dd63SDavid Woodhouse * deadlock a number of file systems. 178714f7dd63SDavid Woodhouse * 178814f7dd63SDavid Woodhouse * This is based heavily on the implementation of same in XFS. 178914f7dd63SDavid Woodhouse */ 179014f7dd63SDavid Woodhouse struct buffered_dirent { 179114f7dd63SDavid Woodhouse u64 ino; 179214f7dd63SDavid Woodhouse loff_t offset; 179314f7dd63SDavid Woodhouse int namlen; 179414f7dd63SDavid Woodhouse unsigned int d_type; 179514f7dd63SDavid Woodhouse char name[]; 179614f7dd63SDavid Woodhouse }; 179714f7dd63SDavid Woodhouse 179814f7dd63SDavid Woodhouse struct readdir_data { 17995c0ba4e0SAl Viro struct dir_context ctx; 180014f7dd63SDavid Woodhouse char *dirent; 180114f7dd63SDavid Woodhouse size_t used; 180253c9c5c0SAl Viro int full; 180314f7dd63SDavid Woodhouse }; 180414f7dd63SDavid Woodhouse 180514f7dd63SDavid Woodhouse static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, 180614f7dd63SDavid Woodhouse loff_t offset, u64 ino, unsigned int d_type) 180714f7dd63SDavid Woodhouse { 180814f7dd63SDavid Woodhouse struct readdir_data *buf = __buf; 180914f7dd63SDavid Woodhouse struct buffered_dirent *de = (void *)(buf->dirent + buf->used); 181014f7dd63SDavid Woodhouse unsigned int reclen; 181114f7dd63SDavid Woodhouse 181214f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); 181353c9c5c0SAl Viro if (buf->used + reclen > PAGE_SIZE) { 181453c9c5c0SAl Viro buf->full = 1; 181514f7dd63SDavid Woodhouse return -EINVAL; 181653c9c5c0SAl Viro } 181714f7dd63SDavid Woodhouse 181814f7dd63SDavid Woodhouse de->namlen = namlen; 181914f7dd63SDavid Woodhouse de->offset = offset; 182014f7dd63SDavid Woodhouse de->ino = ino; 182114f7dd63SDavid Woodhouse de->d_type = d_type; 182214f7dd63SDavid Woodhouse memcpy(de->name, name, namlen); 182314f7dd63SDavid Woodhouse buf->used += reclen; 182414f7dd63SDavid Woodhouse 182514f7dd63SDavid Woodhouse return 0; 182614f7dd63SDavid Woodhouse } 182714f7dd63SDavid Woodhouse 18282f9092e1SDavid Woodhouse static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func, 18292628b766SDavid Woodhouse struct readdir_cd *cdp, loff_t *offsetp) 18302628b766SDavid Woodhouse { 183114f7dd63SDavid Woodhouse struct buffered_dirent *de; 18322628b766SDavid Woodhouse int host_err; 183314f7dd63SDavid Woodhouse int size; 183414f7dd63SDavid Woodhouse loff_t offset; 1835ac6614b7SAl Viro struct readdir_data buf = { 1836ac6614b7SAl Viro .ctx.actor = nfsd_buffered_filldir, 1837ac6614b7SAl Viro .dirent = (void *)__get_free_page(GFP_KERNEL) 1838ac6614b7SAl Viro }; 18392628b766SDavid Woodhouse 184014f7dd63SDavid Woodhouse if (!buf.dirent) 18412f9092e1SDavid Woodhouse return nfserrno(-ENOMEM); 184214f7dd63SDavid Woodhouse 184314f7dd63SDavid Woodhouse offset = *offsetp; 18442628b766SDavid Woodhouse 184514f7dd63SDavid Woodhouse while (1) { 1846496ad9aaSAl Viro struct inode *dir_inode = file_inode(file); 184714f7dd63SDavid Woodhouse unsigned int reclen; 184814f7dd63SDavid Woodhouse 1849b726e923SDoug Nazar cdp->err = nfserr_eof; /* will be cleared on successful read */ 185014f7dd63SDavid Woodhouse buf.used = 0; 185153c9c5c0SAl Viro buf.full = 0; 185214f7dd63SDavid Woodhouse 18535c0ba4e0SAl Viro host_err = iterate_dir(file, &buf.ctx); 185453c9c5c0SAl Viro if (buf.full) 185553c9c5c0SAl Viro host_err = 0; 185653c9c5c0SAl Viro 185753c9c5c0SAl Viro if (host_err < 0) 185814f7dd63SDavid Woodhouse break; 185914f7dd63SDavid Woodhouse 186014f7dd63SDavid Woodhouse size = buf.used; 186114f7dd63SDavid Woodhouse 186214f7dd63SDavid Woodhouse if (!size) 186314f7dd63SDavid Woodhouse break; 186414f7dd63SDavid Woodhouse 18652f9092e1SDavid Woodhouse /* 18662f9092e1SDavid Woodhouse * Various filldir functions may end up calling back into 18672f9092e1SDavid Woodhouse * lookup_one_len() and the file system's ->lookup() method. 18682f9092e1SDavid Woodhouse * These expect i_mutex to be held, as it would within readdir. 18692f9092e1SDavid Woodhouse */ 18702f9092e1SDavid Woodhouse host_err = mutex_lock_killable(&dir_inode->i_mutex); 18712f9092e1SDavid Woodhouse if (host_err) 18722f9092e1SDavid Woodhouse break; 18732f9092e1SDavid Woodhouse 187414f7dd63SDavid Woodhouse de = (struct buffered_dirent *)buf.dirent; 187514f7dd63SDavid Woodhouse while (size > 0) { 187614f7dd63SDavid Woodhouse offset = de->offset; 187714f7dd63SDavid Woodhouse 187814f7dd63SDavid Woodhouse if (func(cdp, de->name, de->namlen, de->offset, 187914f7dd63SDavid Woodhouse de->ino, de->d_type)) 18802f9092e1SDavid Woodhouse break; 188114f7dd63SDavid Woodhouse 188214f7dd63SDavid Woodhouse if (cdp->err != nfs_ok) 18832f9092e1SDavid Woodhouse break; 188414f7dd63SDavid Woodhouse 188514f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(*de) + de->namlen, 188614f7dd63SDavid Woodhouse sizeof(u64)); 188714f7dd63SDavid Woodhouse size -= reclen; 188814f7dd63SDavid Woodhouse de = (struct buffered_dirent *)((char *)de + reclen); 188914f7dd63SDavid Woodhouse } 18902f9092e1SDavid Woodhouse mutex_unlock(&dir_inode->i_mutex); 18912f9092e1SDavid Woodhouse if (size > 0) /* We bailed out early */ 18922f9092e1SDavid Woodhouse break; 18932f9092e1SDavid Woodhouse 1894c002a6c7SDavid Woodhouse offset = vfs_llseek(file, 0, SEEK_CUR); 189514f7dd63SDavid Woodhouse } 189614f7dd63SDavid Woodhouse 189714f7dd63SDavid Woodhouse free_page((unsigned long)(buf.dirent)); 18982628b766SDavid Woodhouse 18992628b766SDavid Woodhouse if (host_err) 19002628b766SDavid Woodhouse return nfserrno(host_err); 190114f7dd63SDavid Woodhouse 190214f7dd63SDavid Woodhouse *offsetp = offset; 19032628b766SDavid Woodhouse return cdp->err; 19042628b766SDavid Woodhouse } 19052628b766SDavid Woodhouse 19061da177e4SLinus Torvalds /* 19071da177e4SLinus Torvalds * Read entries from a directory. 19081da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 19091da177e4SLinus Torvalds */ 19106264d69dSAl Viro __be32 19111da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 1912a0ad13efSNeilBrown struct readdir_cd *cdp, filldir_t func) 19131da177e4SLinus Torvalds { 19146264d69dSAl Viro __be32 err; 19151da177e4SLinus Torvalds struct file *file; 19161da177e4SLinus Torvalds loff_t offset = *offsetp; 191706effdbbSBernd Schubert int may_flags = NFSD_MAY_READ; 19181da177e4SLinus Torvalds 191906effdbbSBernd Schubert /* NFSv2 only supports 32 bit cookies */ 192006effdbbSBernd Schubert if (rqstp->rq_vers > 2) 192106effdbbSBernd Schubert may_flags |= NFSD_MAY_64BIT_COOKIE; 192206effdbbSBernd Schubert 192306effdbbSBernd Schubert err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file); 19241da177e4SLinus Torvalds if (err) 19251da177e4SLinus Torvalds goto out; 19261da177e4SLinus Torvalds 1927b108fe6bSJeff Layton offset = vfs_llseek(file, offset, SEEK_SET); 19281da177e4SLinus Torvalds if (offset < 0) { 19291da177e4SLinus Torvalds err = nfserrno((int)offset); 19301da177e4SLinus Torvalds goto out_close; 19311da177e4SLinus Torvalds } 19321da177e4SLinus Torvalds 193314f7dd63SDavid Woodhouse err = nfsd_buffered_readdir(file, func, cdp, offsetp); 19341da177e4SLinus Torvalds 19351da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 19361da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 19371da177e4SLinus Torvalds out_close: 19381da177e4SLinus Torvalds nfsd_close(file); 19391da177e4SLinus Torvalds out: 19401da177e4SLinus Torvalds return err; 19411da177e4SLinus Torvalds } 19421da177e4SLinus Torvalds 19431da177e4SLinus Torvalds /* 19441da177e4SLinus Torvalds * Get file system stats 19451da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 19461da177e4SLinus Torvalds */ 19476264d69dSAl Viro __be32 194804716e66SJ. Bruce Fields nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) 19491da177e4SLinus Torvalds { 1950f6360efbSTakashi Iwai __be32 err; 1951f6360efbSTakashi Iwai 1952f6360efbSTakashi Iwai err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); 1953f6360efbSTakashi Iwai if (!err) { 1954ebabe9a9SChristoph Hellwig struct path path = { 1955ebabe9a9SChristoph Hellwig .mnt = fhp->fh_export->ex_path.mnt, 1956ebabe9a9SChristoph Hellwig .dentry = fhp->fh_dentry, 1957ebabe9a9SChristoph Hellwig }; 1958f6360efbSTakashi Iwai if (vfs_statfs(&path, stat)) 19591da177e4SLinus Torvalds err = nfserr_io; 1960f6360efbSTakashi Iwai } 19611da177e4SLinus Torvalds return err; 19621da177e4SLinus Torvalds } 19631da177e4SLinus Torvalds 1964c7d51402SJ. Bruce Fields static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) 1965e22841c6SJ. Bruce Fields { 1966c7d51402SJ. Bruce Fields return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; 1967e22841c6SJ. Bruce Fields } 1968e22841c6SJ. Bruce Fields 19691da177e4SLinus Torvalds /* 19701da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 19711da177e4SLinus Torvalds */ 19726264d69dSAl Viro __be32 19730ec757dfSJ. Bruce Fields nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, 19740ec757dfSJ. Bruce Fields struct dentry *dentry, int acc) 19751da177e4SLinus Torvalds { 19761da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 19771da177e4SLinus Torvalds int err; 19781da177e4SLinus Torvalds 1979aea93397SJ. Bruce Fields if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) 19801da177e4SLinus Torvalds return 0; 19811da177e4SLinus Torvalds #if 0 19821da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 19831da177e4SLinus Torvalds acc, 19848837abcaSMiklos Szeredi (acc & NFSD_MAY_READ)? " read" : "", 19858837abcaSMiklos Szeredi (acc & NFSD_MAY_WRITE)? " write" : "", 19868837abcaSMiklos Szeredi (acc & NFSD_MAY_EXEC)? " exec" : "", 19878837abcaSMiklos Szeredi (acc & NFSD_MAY_SATTR)? " sattr" : "", 19888837abcaSMiklos Szeredi (acc & NFSD_MAY_TRUNC)? " trunc" : "", 19898837abcaSMiklos Szeredi (acc & NFSD_MAY_LOCK)? " lock" : "", 19908837abcaSMiklos Szeredi (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", 19911da177e4SLinus Torvalds inode->i_mode, 19921da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 19931da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 19942c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); 19951da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 19965cc0a840SDavid Howells inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); 19971da177e4SLinus Torvalds #endif 19981da177e4SLinus Torvalds 19991da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 20001da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 20011da177e4SLinus Torvalds * device special file, we ignore rofs. 20021da177e4SLinus Torvalds */ 20038837abcaSMiklos Szeredi if (!(acc & NFSD_MAY_LOCAL_ACCESS)) 20048837abcaSMiklos Szeredi if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { 20052c463e95SDave Hansen if (exp_rdonly(rqstp, exp) || 20062c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)) 20071da177e4SLinus Torvalds return nfserr_rofs; 20088837abcaSMiklos Szeredi if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) 20091da177e4SLinus Torvalds return nfserr_perm; 20101da177e4SLinus Torvalds } 20118837abcaSMiklos Szeredi if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) 20121da177e4SLinus Torvalds return nfserr_perm; 20131da177e4SLinus Torvalds 20148837abcaSMiklos Szeredi if (acc & NFSD_MAY_LOCK) { 20151da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 20161da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 20171da177e4SLinus Torvalds * ownership 20181da177e4SLinus Torvalds */ 20191da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 20201da177e4SLinus Torvalds return 0; 20211da177e4SLinus Torvalds else 20228837abcaSMiklos Szeredi acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; 20231da177e4SLinus Torvalds } 20241da177e4SLinus Torvalds /* 20251da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 20261da177e4SLinus Torvalds * would normally be checked at open time. This is to make 20271da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 20281da177e4SLinus Torvalds * 20291da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 20301da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 20311da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 20321da177e4SLinus Torvalds * always implies file truncation. 20331da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 20341da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 20351da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 20361da177e4SLinus Torvalds * with NFSv3. 20371da177e4SLinus Torvalds */ 20388837abcaSMiklos Szeredi if ((acc & NFSD_MAY_OWNER_OVERRIDE) && 20396fab8779SEric W. Biederman uid_eq(inode->i_uid, current_fsuid())) 20401da177e4SLinus Torvalds return 0; 20411da177e4SLinus Torvalds 20428837abcaSMiklos Szeredi /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ 2043f419a2e3SAl Viro err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); 20441da177e4SLinus Torvalds 20451da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 20461da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 2047a043226bSJ. Bruce Fields (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || 2048a043226bSJ. Bruce Fields acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) 2049f419a2e3SAl Viro err = inode_permission(inode, MAY_EXEC); 20501da177e4SLinus Torvalds 20511da177e4SLinus Torvalds return err? nfserrno(err) : 0; 20521da177e4SLinus Torvalds } 20531da177e4SLinus Torvalds 20541da177e4SLinus Torvalds void 20551da177e4SLinus Torvalds nfsd_racache_shutdown(void) 20561da177e4SLinus Torvalds { 205754a66e54SJeff Layton struct raparms *raparm, *last_raparm; 205854a66e54SJeff Layton unsigned int i; 205954a66e54SJeff Layton 20601da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 206154a66e54SJeff Layton 206254a66e54SJeff Layton for (i = 0; i < RAPARM_HASH_SIZE; i++) { 206354a66e54SJeff Layton raparm = raparm_hash[i].pb_head; 206454a66e54SJeff Layton while(raparm) { 206554a66e54SJeff Layton last_raparm = raparm; 206654a66e54SJeff Layton raparm = raparm->p_next; 206754a66e54SJeff Layton kfree(last_raparm); 206854a66e54SJeff Layton } 206954a66e54SJeff Layton raparm_hash[i].pb_head = NULL; 207054a66e54SJeff Layton } 20711da177e4SLinus Torvalds } 20721da177e4SLinus Torvalds /* 20731da177e4SLinus Torvalds * Initialize readahead param cache 20741da177e4SLinus Torvalds */ 20751da177e4SLinus Torvalds int 20761da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 20771da177e4SLinus Torvalds { 20781da177e4SLinus Torvalds int i; 2079fce1456aSGreg Banks int j = 0; 2080fce1456aSGreg Banks int nperbucket; 208154a66e54SJeff Layton struct raparms **raparm = NULL; 20821da177e4SLinus Torvalds 2083fce1456aSGreg Banks 208454a66e54SJeff Layton if (raparm_hash[0].pb_head) 20851da177e4SLinus Torvalds return 0; 208654a66e54SJeff Layton nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); 208754a66e54SJeff Layton if (nperbucket < 2) 208854a66e54SJeff Layton nperbucket = 2; 208954a66e54SJeff Layton cache_size = nperbucket * RAPARM_HASH_SIZE; 20904b3bb06bSYan Burman 20914b3bb06bSYan Burman dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); 209254a66e54SJeff Layton 2093fce1456aSGreg Banks for (i = 0; i < RAPARM_HASH_SIZE; i++) { 2094fce1456aSGreg Banks spin_lock_init(&raparm_hash[i].pb_lock); 209554a66e54SJeff Layton 209654a66e54SJeff Layton raparm = &raparm_hash[i].pb_head; 209754a66e54SJeff Layton for (j = 0; j < nperbucket; j++) { 209854a66e54SJeff Layton *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); 209954a66e54SJeff Layton if (!*raparm) 210054a66e54SJeff Layton goto out_nomem; 210154a66e54SJeff Layton raparm = &(*raparm)->p_next; 2102fce1456aSGreg Banks } 210354a66e54SJeff Layton *raparm = NULL; 21041da177e4SLinus Torvalds } 21054b3bb06bSYan Burman 21061da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 21071da177e4SLinus Torvalds return 0; 210854a66e54SJeff Layton 210954a66e54SJeff Layton out_nomem: 211054a66e54SJeff Layton dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); 211154a66e54SJeff Layton nfsd_racache_shutdown(); 211254a66e54SJeff Layton return -ENOMEM; 21131da177e4SLinus Torvalds } 2114