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 { 2101da177e4SLinus Torvalds fh_lock(fhp); 2111da177e4SLinus Torvalds dentry = lookup_one_len(name, dparent, len); 2126264d69dSAl Viro host_err = PTR_ERR(dentry); 2131da177e4SLinus Torvalds if (IS_ERR(dentry)) 2141da177e4SLinus Torvalds goto out_nfserr; 2151da177e4SLinus Torvalds /* 2161da177e4SLinus Torvalds * check if we have crossed a mount point ... 2171da177e4SLinus Torvalds */ 21882ead7feSJ. Bruce Fields if (nfsd_mountpoint(dentry, exp)) { 2196264d69dSAl Viro if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 2201da177e4SLinus Torvalds dput(dentry); 2211da177e4SLinus Torvalds goto out_nfserr; 2221da177e4SLinus Torvalds } 2231da177e4SLinus Torvalds } 2241da177e4SLinus Torvalds } 2256c0a654dSJ. Bruce Fields *dentry_ret = dentry; 2266c0a654dSJ. Bruce Fields *exp_ret = exp; 2276c0a654dSJ. Bruce Fields return 0; 2286c0a654dSJ. Bruce Fields 2296c0a654dSJ. Bruce Fields out_nfserr: 2306c0a654dSJ. Bruce Fields exp_put(exp); 2316c0a654dSJ. Bruce Fields return nfserrno(host_err); 2326c0a654dSJ. Bruce Fields } 2336c0a654dSJ. Bruce Fields 2346c0a654dSJ. Bruce Fields /* 2356c0a654dSJ. Bruce Fields * Look up one component of a pathname. 2366c0a654dSJ. Bruce Fields * N.B. After this call _both_ fhp and resfh need an fh_put 2376c0a654dSJ. Bruce Fields * 2386c0a654dSJ. Bruce Fields * If the lookup would cross a mountpoint, and the mounted filesystem 2396c0a654dSJ. Bruce Fields * is exported to the client with NFSEXP_NOHIDE, then the lookup is 2406c0a654dSJ. Bruce Fields * accepted as it stands and the mounted directory is 2416c0a654dSJ. Bruce Fields * returned. Otherwise the covered directory is returned. 2426c0a654dSJ. Bruce Fields * NOTE: this mountpoint crossing is not supported properly by all 2436c0a654dSJ. Bruce Fields * clients and is explicitly disallowed for NFSv3 2446c0a654dSJ. Bruce Fields * NeilBrown <neilb@cse.unsw.edu.au> 2456c0a654dSJ. Bruce Fields */ 2466c0a654dSJ. Bruce Fields __be32 2476c0a654dSJ. Bruce Fields nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 2485a022fc8SChuck Lever unsigned int len, struct svc_fh *resfh) 2496c0a654dSJ. Bruce Fields { 2506c0a654dSJ. Bruce Fields struct svc_export *exp; 2516c0a654dSJ. Bruce Fields struct dentry *dentry; 2526c0a654dSJ. Bruce Fields __be32 err; 2536c0a654dSJ. Bruce Fields 25429a78a3eSJ. Bruce Fields err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 25529a78a3eSJ. Bruce Fields if (err) 25629a78a3eSJ. Bruce Fields return err; 2576c0a654dSJ. Bruce Fields err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); 2586c0a654dSJ. Bruce Fields if (err) 2596c0a654dSJ. Bruce Fields return err; 26032c1eb0cSAndy Adamson err = check_nfsd_access(exp, rqstp); 26132c1eb0cSAndy Adamson if (err) 26232c1eb0cSAndy Adamson goto out; 2631da177e4SLinus Torvalds /* 2641da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2651da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2661da177e4SLinus Torvalds */ 2671da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2681da177e4SLinus Torvalds if (!err && !dentry->d_inode) 2691da177e4SLinus Torvalds err = nfserr_noent; 27032c1eb0cSAndy Adamson out: 2711da177e4SLinus Torvalds dput(dentry); 2721da177e4SLinus Torvalds exp_put(exp); 2731da177e4SLinus Torvalds return err; 2741da177e4SLinus Torvalds } 2751da177e4SLinus Torvalds 2764795bb37SJ. Bruce Fields static int nfsd_break_lease(struct inode *inode) 2774795bb37SJ. Bruce Fields { 2784795bb37SJ. Bruce Fields if (!S_ISREG(inode->i_mode)) 2794795bb37SJ. Bruce Fields return 0; 2804795bb37SJ. Bruce Fields return break_lease(inode, O_WRONLY | O_NONBLOCK); 2814795bb37SJ. Bruce Fields } 2824795bb37SJ. Bruce Fields 283f501912aSBen Myers /* 284f501912aSBen Myers * Commit metadata changes to stable storage. 285f501912aSBen Myers */ 286f501912aSBen Myers static int 287f501912aSBen Myers commit_metadata(struct svc_fh *fhp) 288f501912aSBen Myers { 289f501912aSBen Myers struct inode *inode = fhp->fh_dentry->d_inode; 290f501912aSBen Myers const struct export_operations *export_ops = inode->i_sb->s_export_op; 291f501912aSBen Myers 292f501912aSBen Myers if (!EX_ISSYNC(fhp->fh_export)) 293f501912aSBen Myers return 0; 294f501912aSBen Myers 295c3765016SChristoph Hellwig if (export_ops->commit_metadata) 296c3765016SChristoph Hellwig return export_ops->commit_metadata(inode); 297c3765016SChristoph Hellwig return sync_inode_metadata(inode, 1); 298f501912aSBen Myers } 2996c0a654dSJ. Bruce Fields 3001da177e4SLinus Torvalds /* 301*818e5a22SChristoph Hellwig * Go over the attributes and take care of the small differences between 302*818e5a22SChristoph Hellwig * NFS semantics and what Linux expects. 303*818e5a22SChristoph Hellwig */ 304*818e5a22SChristoph Hellwig static void 305*818e5a22SChristoph Hellwig nfsd_sanitize_attrs(struct inode *inode, struct iattr *iap) 306*818e5a22SChristoph Hellwig { 307*818e5a22SChristoph Hellwig /* 308*818e5a22SChristoph Hellwig * NFSv2 does not differentiate between "set-[ac]time-to-now" 309*818e5a22SChristoph Hellwig * which only requires access, and "set-[ac]time-to-X" which 310*818e5a22SChristoph Hellwig * requires ownership. 311*818e5a22SChristoph Hellwig * So if it looks like it might be "set both to the same time which 312*818e5a22SChristoph Hellwig * is close to now", and if inode_change_ok fails, then we 313*818e5a22SChristoph Hellwig * convert to "set to now" instead of "set to explicit time" 314*818e5a22SChristoph Hellwig * 315*818e5a22SChristoph Hellwig * We only call inode_change_ok as the last test as technically 316*818e5a22SChristoph Hellwig * it is not an interface that we should be using. 317*818e5a22SChristoph Hellwig */ 318*818e5a22SChristoph Hellwig #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) 319*818e5a22SChristoph Hellwig #define MAX_TOUCH_TIME_ERROR (30*60) 320*818e5a22SChristoph Hellwig if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && 321*818e5a22SChristoph Hellwig iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { 322*818e5a22SChristoph Hellwig /* 323*818e5a22SChristoph Hellwig * Looks probable. 324*818e5a22SChristoph Hellwig * 325*818e5a22SChristoph Hellwig * Now just make sure time is in the right ballpark. 326*818e5a22SChristoph Hellwig * Solaris, at least, doesn't seem to care what the time 327*818e5a22SChristoph Hellwig * request is. We require it be within 30 minutes of now. 328*818e5a22SChristoph Hellwig */ 329*818e5a22SChristoph Hellwig time_t delta = iap->ia_atime.tv_sec - get_seconds(); 330*818e5a22SChristoph Hellwig if (delta < 0) 331*818e5a22SChristoph Hellwig delta = -delta; 332*818e5a22SChristoph Hellwig if (delta < MAX_TOUCH_TIME_ERROR && 333*818e5a22SChristoph Hellwig inode_change_ok(inode, iap) != 0) { 334*818e5a22SChristoph Hellwig /* 335*818e5a22SChristoph Hellwig * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. 336*818e5a22SChristoph Hellwig * This will cause notify_change to set these times 337*818e5a22SChristoph Hellwig * to "now" 338*818e5a22SChristoph Hellwig */ 339*818e5a22SChristoph Hellwig iap->ia_valid &= ~BOTH_TIME_SET; 340*818e5a22SChristoph Hellwig } 341*818e5a22SChristoph Hellwig } 342*818e5a22SChristoph Hellwig 343*818e5a22SChristoph Hellwig /* sanitize the mode change */ 344*818e5a22SChristoph Hellwig if (iap->ia_valid & ATTR_MODE) { 345*818e5a22SChristoph Hellwig iap->ia_mode &= S_IALLUGO; 346*818e5a22SChristoph Hellwig iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); 347*818e5a22SChristoph Hellwig } 348*818e5a22SChristoph Hellwig 349*818e5a22SChristoph Hellwig /* Revoke setuid/setgid on chown */ 350*818e5a22SChristoph Hellwig if (!S_ISDIR(inode->i_mode) && 351*818e5a22SChristoph Hellwig (((iap->ia_valid & ATTR_UID) && !uid_eq(iap->ia_uid, inode->i_uid)) || 352*818e5a22SChristoph Hellwig ((iap->ia_valid & ATTR_GID) && !gid_eq(iap->ia_gid, inode->i_gid)))) { 353*818e5a22SChristoph Hellwig iap->ia_valid |= ATTR_KILL_PRIV; 354*818e5a22SChristoph Hellwig if (iap->ia_valid & ATTR_MODE) { 355*818e5a22SChristoph Hellwig /* we're setting mode too, just clear the s*id bits */ 356*818e5a22SChristoph Hellwig iap->ia_mode &= ~S_ISUID; 357*818e5a22SChristoph Hellwig if (iap->ia_mode & S_IXGRP) 358*818e5a22SChristoph Hellwig iap->ia_mode &= ~S_ISGID; 359*818e5a22SChristoph Hellwig } else { 360*818e5a22SChristoph Hellwig /* set ATTR_KILL_* bits and let VFS handle it */ 361*818e5a22SChristoph Hellwig iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); 362*818e5a22SChristoph Hellwig } 363*818e5a22SChristoph Hellwig } 364*818e5a22SChristoph Hellwig } 365*818e5a22SChristoph Hellwig 366*818e5a22SChristoph Hellwig static __be32 367*818e5a22SChristoph Hellwig nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp, 368*818e5a22SChristoph Hellwig struct iattr *iap) 369*818e5a22SChristoph Hellwig { 370*818e5a22SChristoph Hellwig struct inode *inode = fhp->fh_dentry->d_inode; 371*818e5a22SChristoph Hellwig int host_err; 372*818e5a22SChristoph Hellwig 373*818e5a22SChristoph Hellwig if (iap->ia_size < inode->i_size) { 374*818e5a22SChristoph Hellwig __be32 err; 375*818e5a22SChristoph Hellwig 376*818e5a22SChristoph Hellwig err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 377*818e5a22SChristoph Hellwig NFSD_MAY_TRUNC | NFSD_MAY_OWNER_OVERRIDE); 378*818e5a22SChristoph Hellwig if (err) 379*818e5a22SChristoph Hellwig return err; 380*818e5a22SChristoph Hellwig } 381*818e5a22SChristoph Hellwig 382*818e5a22SChristoph Hellwig host_err = get_write_access(inode); 383*818e5a22SChristoph Hellwig if (host_err) 384*818e5a22SChristoph Hellwig goto out_nfserrno; 385*818e5a22SChristoph Hellwig 386*818e5a22SChristoph Hellwig host_err = locks_verify_truncate(inode, NULL, iap->ia_size); 387*818e5a22SChristoph Hellwig if (host_err) 388*818e5a22SChristoph Hellwig goto out_put_write_access; 389*818e5a22SChristoph Hellwig return 0; 390*818e5a22SChristoph Hellwig 391*818e5a22SChristoph Hellwig out_put_write_access: 392*818e5a22SChristoph Hellwig put_write_access(inode); 393*818e5a22SChristoph Hellwig out_nfserrno: 394*818e5a22SChristoph Hellwig return nfserrno(host_err); 395*818e5a22SChristoph Hellwig } 396*818e5a22SChristoph Hellwig 397*818e5a22SChristoph Hellwig /* 398*818e5a22SChristoph Hellwig * Set various file attributes. After this call fhp needs an fh_put. 3991da177e4SLinus Torvalds */ 4006264d69dSAl Viro __be32 4011da177e4SLinus Torvalds nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 4021da177e4SLinus Torvalds int check_guard, time_t guardtime) 4031da177e4SLinus Torvalds { 4041da177e4SLinus Torvalds struct dentry *dentry; 4051da177e4SLinus Torvalds struct inode *inode; 4068837abcaSMiklos Szeredi int accmode = NFSD_MAY_SATTR; 407175a4eb7SAl Viro umode_t ftype = 0; 4086264d69dSAl Viro __be32 err; 4096264d69dSAl Viro int host_err; 4101da177e4SLinus Torvalds int size_change = 0; 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) 4138837abcaSMiklos Szeredi accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; 4141da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) 4151da177e4SLinus Torvalds ftype = S_IFREG; 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds /* Get inode */ 4181da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 41915b7a1b8SNeilBrown if (err) 4201da177e4SLinus Torvalds goto out; 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds dentry = fhp->fh_dentry; 4231da177e4SLinus Torvalds inode = dentry->d_inode; 4241da177e4SLinus Torvalds 42515b7a1b8SNeilBrown /* Ignore any mode updates on symlinks */ 42615b7a1b8SNeilBrown if (S_ISLNK(inode->i_mode)) 42715b7a1b8SNeilBrown iap->ia_valid &= ~ATTR_MODE; 42815b7a1b8SNeilBrown 42915b7a1b8SNeilBrown if (!iap->ia_valid) 43015b7a1b8SNeilBrown goto out; 43115b7a1b8SNeilBrown 432*818e5a22SChristoph Hellwig nfsd_sanitize_attrs(inode, iap); 4331da177e4SLinus Torvalds 4349c85fca5SChristoph Hellwig /* 435*818e5a22SChristoph Hellwig * The size case is special, it changes the file in addition to the 436*818e5a22SChristoph Hellwig * attributes. 4379c85fca5SChristoph Hellwig */ 4381da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) { 439*818e5a22SChristoph Hellwig err = nfsd_get_write_access(rqstp, fhp, iap); 4401da177e4SLinus Torvalds if (err) 4411da177e4SLinus Torvalds goto out; 4421da177e4SLinus Torvalds size_change = 1; 4431da177e4SLinus Torvalds } 4441da177e4SLinus Torvalds 4451da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 4461da177e4SLinus Torvalds 4471da177e4SLinus Torvalds err = nfserr_notsync; 4481da177e4SLinus Torvalds if (!check_guard || guardtime == inode->i_ctime.tv_sec) { 4494795bb37SJ. Bruce Fields host_err = nfsd_break_lease(inode); 4506a76bebeSJ. Bruce Fields if (host_err) 4516a76bebeSJ. Bruce Fields goto out_nfserr; 4521da177e4SLinus Torvalds fh_lock(fhp); 4536a76bebeSJ. Bruce Fields 45427ac0ffeSJ. Bruce Fields host_err = notify_change(dentry, iap, NULL); 4556264d69dSAl Viro err = nfserrno(host_err); 4561da177e4SLinus Torvalds fh_unlock(fhp); 4571da177e4SLinus Torvalds } 4581da177e4SLinus Torvalds if (size_change) 4591da177e4SLinus Torvalds put_write_access(inode); 4601da177e4SLinus Torvalds if (!err) 461b160fdabSChristoph Hellwig commit_metadata(fhp); 4621da177e4SLinus Torvalds out: 4631da177e4SLinus Torvalds return err; 4641da177e4SLinus Torvalds 4651da177e4SLinus Torvalds out_nfserr: 4666264d69dSAl Viro err = nfserrno(host_err); 4671da177e4SLinus Torvalds goto out; 4681da177e4SLinus Torvalds } 4691da177e4SLinus Torvalds 4705be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V2_ACL) || \ 4715be196e5SChristoph Hellwig defined(CONFIG_NFSD_V3_ACL) || \ 4725be196e5SChristoph Hellwig defined(CONFIG_NFSD_V4) 4735be196e5SChristoph Hellwig static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) 4745be196e5SChristoph Hellwig { 4755be196e5SChristoph Hellwig ssize_t buflen; 4766c6a426fSKrishna Kumar ssize_t ret; 4771da177e4SLinus Torvalds 4785be196e5SChristoph Hellwig buflen = vfs_getxattr(dentry, key, NULL, 0); 4795be196e5SChristoph Hellwig if (buflen <= 0) 4805be196e5SChristoph Hellwig return buflen; 4815be196e5SChristoph Hellwig 4825be196e5SChristoph Hellwig *buf = kmalloc(buflen, GFP_KERNEL); 4835be196e5SChristoph Hellwig if (!*buf) 4845be196e5SChristoph Hellwig return -ENOMEM; 4855be196e5SChristoph Hellwig 4866c6a426fSKrishna Kumar ret = vfs_getxattr(dentry, key, *buf, buflen); 4876c6a426fSKrishna Kumar if (ret < 0) 4886c6a426fSKrishna Kumar kfree(*buf); 4896c6a426fSKrishna Kumar return ret; 4905be196e5SChristoph Hellwig } 4915be196e5SChristoph Hellwig #endif 4925be196e5SChristoph Hellwig 4935be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V4) 4941da177e4SLinus Torvalds static int 4951da177e4SLinus Torvalds set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) 4961da177e4SLinus Torvalds { 4971da177e4SLinus Torvalds int len; 4981da177e4SLinus Torvalds size_t buflen; 4991da177e4SLinus Torvalds char *buf = NULL; 5001da177e4SLinus Torvalds int error = 0; 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds buflen = posix_acl_xattr_size(pacl->a_count); 5031da177e4SLinus Torvalds buf = kmalloc(buflen, GFP_KERNEL); 5041da177e4SLinus Torvalds error = -ENOMEM; 5051da177e4SLinus Torvalds if (buf == NULL) 5061da177e4SLinus Torvalds goto out; 5071da177e4SLinus Torvalds 5085f3a4a28SEric W. Biederman len = posix_acl_to_xattr(&init_user_ns, pacl, buf, buflen); 5091da177e4SLinus Torvalds if (len < 0) { 5101da177e4SLinus Torvalds error = len; 5111da177e4SLinus Torvalds goto out; 5121da177e4SLinus Torvalds } 5131da177e4SLinus Torvalds 5145be196e5SChristoph Hellwig error = vfs_setxattr(dentry, key, buf, len, 0); 5151da177e4SLinus Torvalds out: 5161da177e4SLinus Torvalds kfree(buf); 5171da177e4SLinus Torvalds return error; 5181da177e4SLinus Torvalds } 5191da177e4SLinus Torvalds 5206264d69dSAl Viro __be32 5211da177e4SLinus Torvalds nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, 5221da177e4SLinus Torvalds struct nfs4_acl *acl) 5231da177e4SLinus Torvalds { 5246264d69dSAl Viro __be32 error; 5256264d69dSAl Viro int host_error; 5261da177e4SLinus Torvalds struct dentry *dentry; 5271da177e4SLinus Torvalds struct inode *inode; 5281da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 5291da177e4SLinus Torvalds unsigned int flags = 0; 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds /* Get inode */ 532e281d810SJ. Bruce Fields error = fh_verify(rqstp, fhp, 0, NFSD_MAY_SATTR); 5331da177e4SLinus Torvalds if (error) 5344b2ca38aSJ. Bruce Fields return error; 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds dentry = fhp->fh_dentry; 5371da177e4SLinus Torvalds inode = dentry->d_inode; 5381da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) 5391da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5401da177e4SLinus Torvalds 5416264d69dSAl Viro host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); 5426264d69dSAl Viro if (host_error == -EINVAL) { 5434b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 5446264d69dSAl Viro } else if (host_error < 0) 5451da177e4SLinus Torvalds goto out_nfserr; 5461da177e4SLinus Torvalds 5476264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); 5486264d69dSAl Viro if (host_error < 0) 5494b2ca38aSJ. Bruce Fields goto out_release; 5501da177e4SLinus Torvalds 5514b2ca38aSJ. Bruce Fields if (S_ISDIR(inode->i_mode)) 5526264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); 5531da177e4SLinus Torvalds 5544b2ca38aSJ. Bruce Fields out_release: 5551da177e4SLinus Torvalds posix_acl_release(pacl); 5561da177e4SLinus Torvalds posix_acl_release(dpacl); 5571da177e4SLinus Torvalds out_nfserr: 558f34f9242SJ. Bruce Fields if (host_error == -EOPNOTSUPP) 5594b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 560f34f9242SJ. Bruce Fields else 5614b2ca38aSJ. Bruce Fields return nfserrno(host_error); 5621da177e4SLinus Torvalds } 5631da177e4SLinus Torvalds 5641da177e4SLinus Torvalds static struct posix_acl * 5651da177e4SLinus Torvalds _get_posix_acl(struct dentry *dentry, char *key) 5661da177e4SLinus Torvalds { 5675be196e5SChristoph Hellwig void *buf = NULL; 5681da177e4SLinus Torvalds struct posix_acl *pacl = NULL; 5695be196e5SChristoph Hellwig int buflen; 5701da177e4SLinus Torvalds 5715be196e5SChristoph Hellwig buflen = nfsd_getxattr(dentry, key, &buf); 5725be196e5SChristoph Hellwig if (!buflen) 5735be196e5SChristoph Hellwig buflen = -ENODATA; 5745be196e5SChristoph Hellwig if (buflen <= 0) 5755be196e5SChristoph Hellwig return ERR_PTR(buflen); 5761da177e4SLinus Torvalds 5775f3a4a28SEric W. Biederman pacl = posix_acl_from_xattr(&init_user_ns, buf, buflen); 5781da177e4SLinus Torvalds kfree(buf); 5791da177e4SLinus Torvalds return pacl; 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds int 5831da177e4SLinus Torvalds nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) 5841da177e4SLinus Torvalds { 5851da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 5861da177e4SLinus Torvalds int error = 0; 5871da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 5881da177e4SLinus Torvalds unsigned int flags = 0; 5891da177e4SLinus Torvalds 5909a59f452SChristoph Hellwig pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); 5911da177e4SLinus Torvalds if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) 5921da177e4SLinus Torvalds pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 5931da177e4SLinus Torvalds if (IS_ERR(pacl)) { 5941da177e4SLinus Torvalds error = PTR_ERR(pacl); 5951da177e4SLinus Torvalds pacl = NULL; 5961da177e4SLinus Torvalds goto out; 5971da177e4SLinus Torvalds } 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) { 6009a59f452SChristoph Hellwig dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); 6011da177e4SLinus Torvalds if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) 6021da177e4SLinus Torvalds dpacl = NULL; 6031da177e4SLinus Torvalds else if (IS_ERR(dpacl)) { 6041da177e4SLinus Torvalds error = PTR_ERR(dpacl); 6051da177e4SLinus Torvalds dpacl = NULL; 6061da177e4SLinus Torvalds goto out; 6071da177e4SLinus Torvalds } 6081da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 6091da177e4SLinus Torvalds } 6101da177e4SLinus Torvalds 6111da177e4SLinus Torvalds *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); 6121da177e4SLinus Torvalds if (IS_ERR(*acl)) { 6131da177e4SLinus Torvalds error = PTR_ERR(*acl); 6141da177e4SLinus Torvalds *acl = NULL; 6151da177e4SLinus Torvalds } 6161da177e4SLinus Torvalds out: 6171da177e4SLinus Torvalds posix_acl_release(pacl); 6181da177e4SLinus Torvalds posix_acl_release(dpacl); 6191da177e4SLinus Torvalds return error; 6201da177e4SLinus Torvalds } 6211da177e4SLinus Torvalds 6229b4146e8SChuck Lever /* 6239b4146e8SChuck Lever * NFS junction information is stored in an extended attribute. 6249b4146e8SChuck Lever */ 6259b4146e8SChuck Lever #define NFSD_JUNCTION_XATTR_NAME XATTR_TRUSTED_PREFIX "junction.nfs" 6269b4146e8SChuck Lever 6279b4146e8SChuck Lever /** 6289b4146e8SChuck Lever * nfsd4_is_junction - Test if an object could be an NFS junction 6299b4146e8SChuck Lever * 6309b4146e8SChuck Lever * @dentry: object to test 6319b4146e8SChuck Lever * 6329b4146e8SChuck Lever * Returns 1 if "dentry" appears to contain NFS junction information. 6339b4146e8SChuck Lever * Otherwise 0 is returned. 6349b4146e8SChuck Lever */ 63511fcee02STrond Myklebust int nfsd4_is_junction(struct dentry *dentry) 63611fcee02STrond Myklebust { 63711fcee02STrond Myklebust struct inode *inode = dentry->d_inode; 63811fcee02STrond Myklebust 63911fcee02STrond Myklebust if (inode == NULL) 64011fcee02STrond Myklebust return 0; 64111fcee02STrond Myklebust if (inode->i_mode & S_IXUGO) 64211fcee02STrond Myklebust return 0; 64311fcee02STrond Myklebust if (!(inode->i_mode & S_ISVTX)) 64411fcee02STrond Myklebust return 0; 6459b4146e8SChuck Lever if (vfs_getxattr(dentry, NFSD_JUNCTION_XATTR_NAME, NULL, 0) <= 0) 64611fcee02STrond Myklebust return 0; 64711fcee02STrond Myklebust return 1; 64811fcee02STrond Myklebust } 64918032ca0SDavid Quigley #ifdef CONFIG_NFSD_V4_SECURITY_LABEL 65018032ca0SDavid Quigley __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp, 65118032ca0SDavid Quigley struct xdr_netobj *label) 65218032ca0SDavid Quigley { 65318032ca0SDavid Quigley __be32 error; 65418032ca0SDavid Quigley int host_error; 65518032ca0SDavid Quigley struct dentry *dentry; 65618032ca0SDavid Quigley 65718032ca0SDavid Quigley error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); 65818032ca0SDavid Quigley if (error) 65918032ca0SDavid Quigley return error; 66018032ca0SDavid Quigley 66118032ca0SDavid Quigley dentry = fhp->fh_dentry; 66218032ca0SDavid Quigley 66318032ca0SDavid Quigley mutex_lock(&dentry->d_inode->i_mutex); 66418032ca0SDavid Quigley host_error = security_inode_setsecctx(dentry, label->data, label->len); 66518032ca0SDavid Quigley mutex_unlock(&dentry->d_inode->i_mutex); 66618032ca0SDavid Quigley return nfserrno(host_error); 66718032ca0SDavid Quigley } 66818032ca0SDavid Quigley #else 66918032ca0SDavid Quigley __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp, 67018032ca0SDavid Quigley struct xdr_netobj *label) 67118032ca0SDavid Quigley { 67218032ca0SDavid Quigley return nfserr_notsupp; 67318032ca0SDavid Quigley } 67418032ca0SDavid Quigley #endif 67518032ca0SDavid Quigley 6766a85d6c7SJ. Bruce Fields #endif /* defined(CONFIG_NFSD_V4) */ 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 6791da177e4SLinus Torvalds /* 6801da177e4SLinus Torvalds * Check server access rights to a file system object 6811da177e4SLinus Torvalds */ 6821da177e4SLinus Torvalds struct accessmap { 6831da177e4SLinus Torvalds u32 access; 6841da177e4SLinus Torvalds int how; 6851da177e4SLinus Torvalds }; 6861da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 6878837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6888837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6898837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, 6908837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, 6911da177e4SLinus Torvalds 6921da177e4SLinus Torvalds { 0, 0 } 6931da177e4SLinus Torvalds }; 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 6968837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6978837abcaSMiklos Szeredi { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, 6988837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, 6998837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, 7008837abcaSMiklos Szeredi { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds { 0, 0 } 7031da177e4SLinus Torvalds }; 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 7061da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 7071da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 7081da177e4SLinus Torvalds * (which really, the server doesn't care about). So 7091da177e4SLinus Torvalds * We provide simple access checking for them, looking 7101da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 7111da177e4SLinus Torvalds * filesystem checks 7121da177e4SLinus Torvalds */ 7138837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 7148837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 7158837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 7168837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds { 0, 0 } 7191da177e4SLinus Torvalds }; 7201da177e4SLinus Torvalds 7216264d69dSAl Viro __be32 7221da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 7231da177e4SLinus Torvalds { 7241da177e4SLinus Torvalds struct accessmap *map; 7251da177e4SLinus Torvalds struct svc_export *export; 7261da177e4SLinus Torvalds struct dentry *dentry; 7271da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 7286264d69dSAl Viro __be32 error; 7291da177e4SLinus Torvalds 7308837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 7311da177e4SLinus Torvalds if (error) 7321da177e4SLinus Torvalds goto out; 7331da177e4SLinus Torvalds 7341da177e4SLinus Torvalds export = fhp->fh_export; 7351da177e4SLinus Torvalds dentry = fhp->fh_dentry; 7361da177e4SLinus Torvalds 7371da177e4SLinus Torvalds if (S_ISREG(dentry->d_inode->i_mode)) 7381da177e4SLinus Torvalds map = nfs3_regaccess; 7391da177e4SLinus Torvalds else if (S_ISDIR(dentry->d_inode->i_mode)) 7401da177e4SLinus Torvalds map = nfs3_diraccess; 7411da177e4SLinus Torvalds else 7421da177e4SLinus Torvalds map = nfs3_anyaccess; 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvalds query = *access; 7461da177e4SLinus Torvalds for (; map->access; map++) { 7471da177e4SLinus Torvalds if (map->access & query) { 7486264d69dSAl Viro __be32 err2; 7491da177e4SLinus Torvalds 7501da177e4SLinus Torvalds sresult |= map->access; 7511da177e4SLinus Torvalds 7520ec757dfSJ. Bruce Fields err2 = nfsd_permission(rqstp, export, dentry, map->how); 7531da177e4SLinus Torvalds switch (err2) { 7541da177e4SLinus Torvalds case nfs_ok: 7551da177e4SLinus Torvalds result |= map->access; 7561da177e4SLinus Torvalds break; 7571da177e4SLinus Torvalds 7581da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 7591da177e4SLinus Torvalds * rather than an error occurred */ 7601da177e4SLinus Torvalds case nfserr_rofs: 7611da177e4SLinus Torvalds case nfserr_acces: 7621da177e4SLinus Torvalds case nfserr_perm: 7631da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 7641da177e4SLinus Torvalds break; 7651da177e4SLinus Torvalds default: 7661da177e4SLinus Torvalds error = err2; 7671da177e4SLinus Torvalds goto out; 7681da177e4SLinus Torvalds } 7691da177e4SLinus Torvalds } 7701da177e4SLinus Torvalds } 7711da177e4SLinus Torvalds *access = result; 7721da177e4SLinus Torvalds if (supported) 7731da177e4SLinus Torvalds *supported = sresult; 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds out: 7761da177e4SLinus Torvalds return error; 7771da177e4SLinus Torvalds } 7781da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 7791da177e4SLinus Torvalds 780105f4622SJ. Bruce Fields static int nfsd_open_break_lease(struct inode *inode, int access) 781105f4622SJ. Bruce Fields { 782105f4622SJ. Bruce Fields unsigned int mode; 7831da177e4SLinus Torvalds 784105f4622SJ. Bruce Fields if (access & NFSD_MAY_NOT_BREAK_LEASE) 785105f4622SJ. Bruce Fields return 0; 786105f4622SJ. Bruce Fields mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; 787105f4622SJ. Bruce Fields return break_lease(inode, mode | O_NONBLOCK); 788105f4622SJ. Bruce Fields } 7891da177e4SLinus Torvalds 7901da177e4SLinus Torvalds /* 7911da177e4SLinus Torvalds * Open an existing file or directory. 792999448a8SBernd Schubert * The may_flags argument indicates the type of open (read/write/lock) 793999448a8SBernd Schubert * and additional flags. 7941da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 7951da177e4SLinus Torvalds */ 7966264d69dSAl Viro __be32 797175a4eb7SAl Viro nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, 798999448a8SBernd Schubert int may_flags, struct file **filp) 7991da177e4SLinus Torvalds { 800765927b2SAl Viro struct path path; 8011da177e4SLinus Torvalds struct inode *inode; 8026264d69dSAl Viro int flags = O_RDONLY|O_LARGEFILE; 8036264d69dSAl Viro __be32 err; 80491885258SJeff Layton int host_err = 0; 8051da177e4SLinus Torvalds 806e0e81739SDavid Howells validate_process_creds(); 807e0e81739SDavid Howells 8081da177e4SLinus Torvalds /* 8091da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 8101da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 8111da177e4SLinus Torvalds * in case a chmod has now revoked permission. 812d91d0b56SJ. Bruce Fields * 813d91d0b56SJ. Bruce Fields * Arguably we should also allow the owner override for 814d91d0b56SJ. Bruce Fields * directories, but we never have and it doesn't seem to have 815d91d0b56SJ. Bruce Fields * caused anyone a problem. If we were to change this, note 816d91d0b56SJ. Bruce Fields * also that our filldir callbacks would need a variant of 817d91d0b56SJ. Bruce Fields * lookup_one_len that doesn't check permissions. 8181da177e4SLinus Torvalds */ 819d91d0b56SJ. Bruce Fields if (type == S_IFREG) 820d91d0b56SJ. Bruce Fields may_flags |= NFSD_MAY_OWNER_OVERRIDE; 821d91d0b56SJ. Bruce Fields err = fh_verify(rqstp, fhp, type, may_flags); 8221da177e4SLinus Torvalds if (err) 8231da177e4SLinus Torvalds goto out; 8241da177e4SLinus Torvalds 825765927b2SAl Viro path.mnt = fhp->fh_export->ex_path.mnt; 826765927b2SAl Viro path.dentry = fhp->fh_dentry; 827765927b2SAl Viro inode = path.dentry->d_inode; 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 8301da177e4SLinus Torvalds * or any access when mandatory locking enabled 8311da177e4SLinus Torvalds */ 8321da177e4SLinus Torvalds err = nfserr_perm; 833999448a8SBernd Schubert if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE)) 8341da177e4SLinus Torvalds goto out; 8355e7fc436SJ. Bruce Fields /* 8365e7fc436SJ. Bruce Fields * We must ignore files (but only files) which might have mandatory 8375e7fc436SJ. Bruce Fields * locks on them because there is no way to know if the accesser has 8385e7fc436SJ. Bruce Fields * the lock. 8395e7fc436SJ. Bruce Fields */ 8405e7fc436SJ. Bruce Fields if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) 8411da177e4SLinus Torvalds goto out; 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds if (!inode->i_fop) 8441da177e4SLinus Torvalds goto out; 8451da177e4SLinus Torvalds 846999448a8SBernd Schubert host_err = nfsd_open_break_lease(inode, may_flags); 8476264d69dSAl Viro if (host_err) /* NOMEM or WOULDBLOCK */ 8481da177e4SLinus Torvalds goto out_nfserr; 8491da177e4SLinus Torvalds 850999448a8SBernd Schubert if (may_flags & NFSD_MAY_WRITE) { 851999448a8SBernd Schubert if (may_flags & NFSD_MAY_READ) 8529ecb6a08SJ. Bruce Fields flags = O_RDWR|O_LARGEFILE; 8539ecb6a08SJ. Bruce Fields else 8541da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 8551da177e4SLinus Torvalds } 856765927b2SAl Viro *filp = dentry_open(&path, flags, current_cred()); 857e4daf1ffSHarshula Jayasuriya if (IS_ERR(*filp)) { 8586264d69dSAl Viro host_err = PTR_ERR(*filp); 859e4daf1ffSHarshula Jayasuriya *filp = NULL; 860e4daf1ffSHarshula Jayasuriya } else { 861999448a8SBernd Schubert host_err = ima_file_check(*filp, may_flags); 862999448a8SBernd Schubert 86306effdbbSBernd Schubert if (may_flags & NFSD_MAY_64BIT_COOKIE) 86406effdbbSBernd Schubert (*filp)->f_mode |= FMODE_64BITHASH; 865aeaa5ccdSChuck Ebbert else 86606effdbbSBernd Schubert (*filp)->f_mode |= FMODE_32BITHASH; 86706effdbbSBernd Schubert } 86806effdbbSBernd Schubert 8691da177e4SLinus Torvalds out_nfserr: 8706264d69dSAl Viro err = nfserrno(host_err); 8711da177e4SLinus Torvalds out: 872e0e81739SDavid Howells validate_process_creds(); 8731da177e4SLinus Torvalds return err; 8741da177e4SLinus Torvalds } 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds /* 8771da177e4SLinus Torvalds * Close a file. 8781da177e4SLinus Torvalds */ 8791da177e4SLinus Torvalds void 8801da177e4SLinus Torvalds nfsd_close(struct file *filp) 8811da177e4SLinus Torvalds { 8821da177e4SLinus Torvalds fput(filp); 8831da177e4SLinus Torvalds } 8841da177e4SLinus Torvalds 8859a8d248eSJ. Bruce Fields /* 8861da177e4SLinus Torvalds * Obtain the readahead parameters for the file 8871da177e4SLinus Torvalds * specified by (dev, ino). 8881da177e4SLinus Torvalds */ 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds static inline struct raparms * 8911da177e4SLinus Torvalds nfsd_get_raparms(dev_t dev, ino_t ino) 8921da177e4SLinus Torvalds { 8931da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 8941da177e4SLinus Torvalds int depth = 0; 895fce1456aSGreg Banks unsigned int hash; 896fce1456aSGreg Banks struct raparm_hbucket *rab; 8971da177e4SLinus Torvalds 898fce1456aSGreg Banks hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; 899fce1456aSGreg Banks rab = &raparm_hash[hash]; 900fce1456aSGreg Banks 901fce1456aSGreg Banks spin_lock(&rab->pb_lock); 902fce1456aSGreg Banks for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { 9031da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 9041da177e4SLinus Torvalds goto found; 9051da177e4SLinus Torvalds depth++; 9061da177e4SLinus Torvalds if (ra->p_count == 0) 9071da177e4SLinus Torvalds frap = rap; 9081da177e4SLinus Torvalds } 9093aa6e0aaSKonstantin Khorenko depth = nfsdstats.ra_size; 9101da177e4SLinus Torvalds if (!frap) { 911fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 9121da177e4SLinus Torvalds return NULL; 9131da177e4SLinus Torvalds } 9141da177e4SLinus Torvalds rap = frap; 9151da177e4SLinus Torvalds ra = *frap; 9161da177e4SLinus Torvalds ra->p_dev = dev; 9171da177e4SLinus Torvalds ra->p_ino = ino; 9181da177e4SLinus Torvalds ra->p_set = 0; 919fce1456aSGreg Banks ra->p_hindex = hash; 9201da177e4SLinus Torvalds found: 921fce1456aSGreg Banks if (rap != &rab->pb_head) { 9221da177e4SLinus Torvalds *rap = ra->p_next; 923fce1456aSGreg Banks ra->p_next = rab->pb_head; 924fce1456aSGreg Banks rab->pb_head = ra; 9251da177e4SLinus Torvalds } 9261da177e4SLinus Torvalds ra->p_count++; 9271da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 928fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 9291da177e4SLinus Torvalds return ra; 9301da177e4SLinus Torvalds } 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds /* 933cf8208d0SJens Axboe * Grab and keep cached pages associated with a file in the svc_rqst 934cf8208d0SJens Axboe * so that they can be passed to the network sendmsg/sendpage routines 935cf8208d0SJens Axboe * directly. They will be released after the sending has completed. 9361da177e4SLinus Torvalds */ 9371da177e4SLinus Torvalds static int 938cf8208d0SJens Axboe nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, 939cf8208d0SJens Axboe struct splice_desc *sd) 9401da177e4SLinus Torvalds { 941cf8208d0SJens Axboe struct svc_rqst *rqstp = sd->u.data; 942afc59400SJ. Bruce Fields struct page **pp = rqstp->rq_next_page; 943cf8208d0SJens Axboe struct page *page = buf->page; 944cf8208d0SJens Axboe size_t size; 945cf8208d0SJens Axboe 946cf8208d0SJens Axboe size = sd->len; 9471da177e4SLinus Torvalds 9481da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 9491da177e4SLinus Torvalds get_page(page); 950afc59400SJ. Bruce Fields put_page(*rqstp->rq_next_page); 951afc59400SJ. Bruce Fields *(rqstp->rq_next_page++) = page; 952cf8208d0SJens Axboe rqstp->rq_res.page_base = buf->offset; 9531da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 95444524359SNeilBrown } else if (page != pp[-1]) { 9551da177e4SLinus Torvalds get_page(page); 956afc59400SJ. Bruce Fields if (*rqstp->rq_next_page) 957afc59400SJ. Bruce Fields put_page(*rqstp->rq_next_page); 958afc59400SJ. Bruce Fields *(rqstp->rq_next_page++) = page; 9591da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 96044524359SNeilBrown } else 9611da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 9621da177e4SLinus Torvalds 9631da177e4SLinus Torvalds return size; 9641da177e4SLinus Torvalds } 9651da177e4SLinus Torvalds 966cf8208d0SJens Axboe static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, 967cf8208d0SJens Axboe struct splice_desc *sd) 968cf8208d0SJens Axboe { 969cf8208d0SJens Axboe return __splice_from_pipe(pipe, sd, nfsd_splice_actor); 970cf8208d0SJens Axboe } 971cf8208d0SJens Axboe 9726264d69dSAl Viro static __be32 9731da177e4SLinus Torvalds nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 9741da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 9751da177e4SLinus Torvalds { 9761da177e4SLinus Torvalds mm_segment_t oldfs; 9776264d69dSAl Viro __be32 err; 9786264d69dSAl Viro int host_err; 9791da177e4SLinus Torvalds 9801da177e4SLinus Torvalds err = nfserr_perm; 981a8754beeSDave Hansen 982cf8208d0SJens Axboe if (file->f_op->splice_read && rqstp->rq_splice_ok) { 983cf8208d0SJens Axboe struct splice_desc sd = { 984cf8208d0SJens Axboe .len = 0, 985cf8208d0SJens Axboe .total_len = *count, 986cf8208d0SJens Axboe .pos = offset, 987cf8208d0SJens Axboe .u.data = rqstp, 988cf8208d0SJens Axboe }; 989cf8208d0SJens Axboe 990afc59400SJ. Bruce Fields rqstp->rq_next_page = rqstp->rq_respages + 1; 991cf8208d0SJens Axboe host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); 9921da177e4SLinus Torvalds } else { 9931da177e4SLinus Torvalds oldfs = get_fs(); 9941da177e4SLinus Torvalds set_fs(KERNEL_DS); 9956264d69dSAl Viro host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); 9961da177e4SLinus Torvalds set_fs(oldfs); 9971da177e4SLinus Torvalds } 9981da177e4SLinus Torvalds 9996264d69dSAl Viro if (host_err >= 0) { 10006264d69dSAl Viro nfsdstats.io_read += host_err; 10016264d69dSAl Viro *count = host_err; 10021da177e4SLinus Torvalds err = 0; 10032a12a9d7SEric Paris fsnotify_access(file); 10041da177e4SLinus Torvalds } else 10056264d69dSAl Viro err = nfserrno(host_err); 10061da177e4SLinus Torvalds return err; 10071da177e4SLinus Torvalds } 10081da177e4SLinus Torvalds 10099f708e40SNeil Brown static void kill_suid(struct dentry *dentry) 10109f708e40SNeil Brown { 10119f708e40SNeil Brown struct iattr ia; 1012b5376771SSerge E. Hallyn ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; 10139f708e40SNeil Brown 10141b1dcc1bSJes Sorensen mutex_lock(&dentry->d_inode->i_mutex); 101527ac0ffeSJ. Bruce Fields /* 101627ac0ffeSJ. Bruce Fields * Note we call this on write, so notify_change will not 101727ac0ffeSJ. Bruce Fields * encounter any conflicting delegations: 101827ac0ffeSJ. Bruce Fields */ 101927ac0ffeSJ. Bruce Fields notify_change(dentry, &ia, NULL); 10201b1dcc1bSJes Sorensen mutex_unlock(&dentry->d_inode->i_mutex); 10219f708e40SNeil Brown } 10229f708e40SNeil Brown 1023d911df7bSJ. Bruce Fields /* 1024d911df7bSJ. Bruce Fields * Gathered writes: If another process is currently writing to the file, 1025d911df7bSJ. Bruce Fields * there's a high chance this is another nfsd (triggered by a bulk write 1026d911df7bSJ. Bruce Fields * from a client's biod). Rather than syncing the file with each write 1027d911df7bSJ. Bruce Fields * request, we sleep for 10 msec. 1028d911df7bSJ. Bruce Fields * 1029d911df7bSJ. Bruce Fields * I don't know if this roughly approximates C. Juszak's idea of 1030d911df7bSJ. Bruce Fields * gathered writes, but it's a nice and simple solution (IMHO), and it 1031d911df7bSJ. Bruce Fields * seems to work:-) 1032d911df7bSJ. Bruce Fields * 1033d911df7bSJ. Bruce Fields * Note: we do this only in the NFSv2 case, since v3 and higher have a 1034d911df7bSJ. Bruce Fields * better tool (separate unstable writes and commits) for solving this 1035d911df7bSJ. Bruce Fields * problem. 1036d911df7bSJ. Bruce Fields */ 1037d911df7bSJ. Bruce Fields static int wait_for_concurrent_writes(struct file *file) 1038d911df7bSJ. Bruce Fields { 1039496ad9aaSAl Viro struct inode *inode = file_inode(file); 1040d911df7bSJ. Bruce Fields static ino_t last_ino; 1041d911df7bSJ. Bruce Fields static dev_t last_dev; 1042d911df7bSJ. Bruce Fields int err = 0; 1043d911df7bSJ. Bruce Fields 1044d911df7bSJ. Bruce Fields if (atomic_read(&inode->i_writecount) > 1 1045d911df7bSJ. Bruce Fields || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 1046d911df7bSJ. Bruce Fields dprintk("nfsd: write defer %d\n", task_pid_nr(current)); 1047d911df7bSJ. Bruce Fields msleep(10); 1048d911df7bSJ. Bruce Fields dprintk("nfsd: write resume %d\n", task_pid_nr(current)); 1049d911df7bSJ. Bruce Fields } 1050d911df7bSJ. Bruce Fields 1051d911df7bSJ. Bruce Fields if (inode->i_state & I_DIRTY) { 1052d911df7bSJ. Bruce Fields dprintk("nfsd: write sync %d\n", task_pid_nr(current)); 10538018ab05SChristoph Hellwig err = vfs_fsync(file, 0); 1054d911df7bSJ. Bruce Fields } 1055d911df7bSJ. Bruce Fields last_ino = inode->i_ino; 1056d911df7bSJ. Bruce Fields last_dev = inode->i_sb->s_dev; 1057d911df7bSJ. Bruce Fields return err; 1058d911df7bSJ. Bruce Fields } 1059d911df7bSJ. Bruce Fields 10606264d69dSAl Viro static __be32 10611da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10621da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 106331dec253SDavid Shaw unsigned long *cnt, int *stablep) 10641da177e4SLinus Torvalds { 10651da177e4SLinus Torvalds struct svc_export *exp; 10661da177e4SLinus Torvalds struct dentry *dentry; 10671da177e4SLinus Torvalds struct inode *inode; 10681da177e4SLinus Torvalds mm_segment_t oldfs; 10696264d69dSAl Viro __be32 err = 0; 10706264d69dSAl Viro int host_err; 10711da177e4SLinus Torvalds int stable = *stablep; 107248e03bc5STrond Myklebust int use_wgather; 1073e49dbbf3SKent Overstreet loff_t pos = offset; 10741da177e4SLinus Torvalds 10757eaa36e2SJosef "Jeff" Sipek dentry = file->f_path.dentry; 10761da177e4SLinus Torvalds inode = dentry->d_inode; 10771da177e4SLinus Torvalds exp = fhp->fh_export; 10781da177e4SLinus Torvalds 107948e03bc5STrond Myklebust use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); 10801da177e4SLinus Torvalds 10811da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 10821da177e4SLinus Torvalds stable = 0; 10831da177e4SLinus Torvalds 10841da177e4SLinus Torvalds /* Write the data. */ 10851da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 1086e49dbbf3SKent Overstreet host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &pos); 10871da177e4SLinus Torvalds set_fs(oldfs); 1088e4636d53SJ. Bruce Fields if (host_err < 0) 1089e4636d53SJ. Bruce Fields goto out_nfserr; 1090a0d24b29SWei Yongjun *cnt = host_err; 109131dec253SDavid Shaw nfsdstats.io_write += host_err; 10922a12a9d7SEric Paris fsnotify_modify(file); 10931da177e4SLinus Torvalds 10941da177e4SLinus Torvalds /* clear setuid/setgid flag after write */ 1095e4636d53SJ. Bruce Fields if (inode->i_mode & (S_ISUID | S_ISGID)) 10969f708e40SNeil Brown kill_suid(dentry); 10971da177e4SLinus Torvalds 1098face1502SJ. Bruce Fields if (stable) { 1099face1502SJ. Bruce Fields if (use_wgather) 1100d911df7bSJ. Bruce Fields host_err = wait_for_concurrent_writes(file); 1101face1502SJ. Bruce Fields else 1102face1502SJ. Bruce Fields host_err = vfs_fsync_range(file, offset, offset+*cnt, 0); 1103face1502SJ. Bruce Fields } 11041da177e4SLinus Torvalds 1105e4636d53SJ. Bruce Fields out_nfserr: 11066264d69dSAl Viro dprintk("nfsd: write complete host_err=%d\n", host_err); 1107a0d24b29SWei Yongjun if (host_err >= 0) 11081da177e4SLinus Torvalds err = 0; 1109a0d24b29SWei Yongjun else 11106264d69dSAl Viro err = nfserrno(host_err); 11111da177e4SLinus Torvalds return err; 11121da177e4SLinus Torvalds } 11131da177e4SLinus Torvalds 11141da177e4SLinus Torvalds /* 11151da177e4SLinus Torvalds * Read data from a file. count must contain the requested read count 11161da177e4SLinus Torvalds * on entry. On return, *count contains the number of bytes actually read. 11171da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 11181da177e4SLinus Torvalds */ 1119039a87caSJ. Bruce Fields __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, 1120fa0a2126SJ. Bruce Fields loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 1121fa0a2126SJ. Bruce Fields { 1122fa0a2126SJ. Bruce Fields struct file *file; 1123fa0a2126SJ. Bruce Fields struct inode *inode; 1124fa0a2126SJ. Bruce Fields struct raparms *ra; 1125fa0a2126SJ. Bruce Fields __be32 err; 1126fa0a2126SJ. Bruce Fields 1127fa0a2126SJ. Bruce Fields err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 1128fa0a2126SJ. Bruce Fields if (err) 1129fa0a2126SJ. Bruce Fields return err; 1130fa0a2126SJ. Bruce Fields 1131496ad9aaSAl Viro inode = file_inode(file); 1132fa0a2126SJ. Bruce Fields 1133fa0a2126SJ. Bruce Fields /* Get readahead parameters */ 1134fa0a2126SJ. Bruce Fields ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); 1135fa0a2126SJ. Bruce Fields 1136fa0a2126SJ. Bruce Fields if (ra && ra->p_set) 1137fa0a2126SJ. Bruce Fields file->f_ra = ra->p_ra; 1138fa0a2126SJ. Bruce Fields 1139fa0a2126SJ. Bruce Fields err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 1140fa0a2126SJ. Bruce Fields 1141fa0a2126SJ. Bruce Fields /* Write back readahead params */ 1142fa0a2126SJ. Bruce Fields if (ra) { 1143fa0a2126SJ. Bruce Fields struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; 1144fa0a2126SJ. Bruce Fields spin_lock(&rab->pb_lock); 1145fa0a2126SJ. Bruce Fields ra->p_ra = file->f_ra; 1146fa0a2126SJ. Bruce Fields ra->p_set = 1; 1147fa0a2126SJ. Bruce Fields ra->p_count--; 1148fa0a2126SJ. Bruce Fields spin_unlock(&rab->pb_lock); 1149fa0a2126SJ. Bruce Fields } 1150fa0a2126SJ. Bruce Fields 1151fa0a2126SJ. Bruce Fields nfsd_close(file); 1152fa0a2126SJ. Bruce Fields return err; 1153fa0a2126SJ. Bruce Fields } 1154fa0a2126SJ. Bruce Fields 1155039a87caSJ. Bruce Fields /* As above, but use the provided file descriptor. */ 11566264d69dSAl Viro __be32 1157039a87caSJ. Bruce Fields nfsd_read_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 11581da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 11591da177e4SLinus Torvalds unsigned long *count) 11601da177e4SLinus Torvalds { 11616264d69dSAl Viro __be32 err; 11621da177e4SLinus Torvalds 11631da177e4SLinus Torvalds if (file) { 11640ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 11658837abcaSMiklos Szeredi NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); 11661da177e4SLinus Torvalds if (err) 11671da177e4SLinus Torvalds goto out; 11681da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 1169039a87caSJ. Bruce Fields } else /* Note file may still be NULL in NFSv4 special stateid case: */ 1170039a87caSJ. Bruce Fields err = nfsd_read(rqstp, fhp, offset, vec, vlen, count); 11711da177e4SLinus Torvalds out: 11721da177e4SLinus Torvalds return err; 11731da177e4SLinus Torvalds } 11741da177e4SLinus Torvalds 11751da177e4SLinus Torvalds /* 11761da177e4SLinus Torvalds * Write data to a file. 11771da177e4SLinus Torvalds * The stable flag requests synchronous writes. 11781da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 11791da177e4SLinus Torvalds */ 11806264d69dSAl Viro __be32 11811da177e4SLinus Torvalds nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 118231dec253SDavid Shaw loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, 11831da177e4SLinus Torvalds int *stablep) 11841da177e4SLinus Torvalds { 11856264d69dSAl Viro __be32 err = 0; 11861da177e4SLinus Torvalds 11871da177e4SLinus Torvalds if (file) { 11880ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 11898837abcaSMiklos Szeredi NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); 11901da177e4SLinus Torvalds if (err) 11911da177e4SLinus Torvalds goto out; 11921da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, 11931da177e4SLinus Torvalds stablep); 11941da177e4SLinus Torvalds } else { 11958837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 11961da177e4SLinus Torvalds if (err) 11971da177e4SLinus Torvalds goto out; 11981da177e4SLinus Torvalds 11991da177e4SLinus Torvalds if (cnt) 12001da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, 12011da177e4SLinus Torvalds cnt, stablep); 12021da177e4SLinus Torvalds nfsd_close(file); 12031da177e4SLinus Torvalds } 12041da177e4SLinus Torvalds out: 12051da177e4SLinus Torvalds return err; 12061da177e4SLinus Torvalds } 12071da177e4SLinus Torvalds 12081da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 12091da177e4SLinus Torvalds /* 12101da177e4SLinus Torvalds * Commit all pending writes to stable storage. 1211aa696a6fSTrond Myklebust * 1212aa696a6fSTrond Myklebust * Note: we only guarantee that data that lies within the range specified 1213aa696a6fSTrond Myklebust * by the 'offset' and 'count' parameters will be synced. 12141da177e4SLinus Torvalds * 12151da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 12161da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 12171da177e4SLinus Torvalds */ 12186264d69dSAl Viro __be32 12191da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 12201da177e4SLinus Torvalds loff_t offset, unsigned long count) 12211da177e4SLinus Torvalds { 12221da177e4SLinus Torvalds struct file *file; 1223aa696a6fSTrond Myklebust loff_t end = LLONG_MAX; 1224aa696a6fSTrond Myklebust __be32 err = nfserr_inval; 12251da177e4SLinus Torvalds 1226aa696a6fSTrond Myklebust if (offset < 0) 1227aa696a6fSTrond Myklebust goto out; 1228aa696a6fSTrond Myklebust if (count != 0) { 1229aa696a6fSTrond Myklebust end = offset + (loff_t)count - 1; 1230aa696a6fSTrond Myklebust if (end < offset) 1231aa696a6fSTrond Myklebust goto out; 1232aa696a6fSTrond Myklebust } 12331da177e4SLinus Torvalds 123491885258SJeff Layton err = nfsd_open(rqstp, fhp, S_IFREG, 123591885258SJeff Layton NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file); 12368837abcaSMiklos Szeredi if (err) 1237aa696a6fSTrond Myklebust goto out; 12381da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 12398018ab05SChristoph Hellwig int err2 = vfs_fsync_range(file, offset, end, 0); 1240aa696a6fSTrond Myklebust 1241aa696a6fSTrond Myklebust if (err2 != -EINVAL) 1242aa696a6fSTrond Myklebust err = nfserrno(err2); 1243aa696a6fSTrond Myklebust else 12441da177e4SLinus Torvalds err = nfserr_notsupp; 12451da177e4SLinus Torvalds } 12461da177e4SLinus Torvalds 12471da177e4SLinus Torvalds nfsd_close(file); 1248aa696a6fSTrond Myklebust out: 12491da177e4SLinus Torvalds return err; 12501da177e4SLinus Torvalds } 12511da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 12521da177e4SLinus Torvalds 1253f2b0dee2SAdrian Bunk static __be32 12545c002b3bSJ. Bruce Fields nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, 12555c002b3bSJ. Bruce Fields struct iattr *iap) 12565c002b3bSJ. Bruce Fields { 12575c002b3bSJ. Bruce Fields /* 12585c002b3bSJ. Bruce Fields * Mode has already been set earlier in create: 12595c002b3bSJ. Bruce Fields */ 12605c002b3bSJ. Bruce Fields iap->ia_valid &= ~ATTR_MODE; 12615c002b3bSJ. Bruce Fields /* 12625c002b3bSJ. Bruce Fields * Setting uid/gid works only for root. Irix appears to 12635c002b3bSJ. Bruce Fields * send along the gid on create when it tries to implement 12645c002b3bSJ. Bruce Fields * setgid directories via NFS: 12655c002b3bSJ. Bruce Fields */ 12666fab8779SEric W. Biederman if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) 12675c002b3bSJ. Bruce Fields iap->ia_valid &= ~(ATTR_UID|ATTR_GID); 12685c002b3bSJ. Bruce Fields if (iap->ia_valid) 12695c002b3bSJ. Bruce Fields return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 12705c002b3bSJ. Bruce Fields return 0; 12715c002b3bSJ. Bruce Fields } 12725c002b3bSJ. Bruce Fields 12734ac35c2fSwengang wang /* HPUX client sometimes creates a file in mode 000, and sets size to 0. 12744ac35c2fSwengang wang * setting size to 0 may fail for some specific file systems by the permission 12754ac35c2fSwengang wang * checking which requires WRITE permission but the mode is 000. 12764ac35c2fSwengang wang * we ignore the resizing(to 0) on the just new created file, since the size is 12774ac35c2fSwengang wang * 0 after file created. 12784ac35c2fSwengang wang * 12794ac35c2fSwengang wang * call this only after vfs_create() is called. 12804ac35c2fSwengang wang * */ 12814ac35c2fSwengang wang static void 12824ac35c2fSwengang wang nfsd_check_ignore_resizing(struct iattr *iap) 12834ac35c2fSwengang wang { 12844ac35c2fSwengang wang if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) 12854ac35c2fSwengang wang iap->ia_valid &= ~ATTR_SIZE; 12864ac35c2fSwengang wang } 12874ac35c2fSwengang wang 12881da177e4SLinus Torvalds /* 12891da177e4SLinus Torvalds * Create a file (regular, directory, device, fifo); UNIX sockets 12901da177e4SLinus Torvalds * not yet implemented. 12911da177e4SLinus Torvalds * If the response fh has been verified, the parent directory should 12921da177e4SLinus Torvalds * already be locked. Note that the parent directory is left locked. 12931da177e4SLinus Torvalds * 12941da177e4SLinus Torvalds * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 12951da177e4SLinus Torvalds */ 12966264d69dSAl Viro __be32 12971da177e4SLinus Torvalds nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 12981da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 12991da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 13001da177e4SLinus Torvalds { 13011da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 13021da177e4SLinus Torvalds struct inode *dirp; 13036264d69dSAl Viro __be32 err; 13045c002b3bSJ. Bruce Fields __be32 err2; 13056264d69dSAl Viro int host_err; 13061da177e4SLinus Torvalds 13071da177e4SLinus Torvalds err = nfserr_perm; 13081da177e4SLinus Torvalds if (!flen) 13091da177e4SLinus Torvalds goto out; 13101da177e4SLinus Torvalds err = nfserr_exist; 13111da177e4SLinus Torvalds if (isdotent(fname, flen)) 13121da177e4SLinus Torvalds goto out; 13131da177e4SLinus Torvalds 13148837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 13151da177e4SLinus Torvalds if (err) 13161da177e4SLinus Torvalds goto out; 13171da177e4SLinus Torvalds 13181da177e4SLinus Torvalds dentry = fhp->fh_dentry; 13191da177e4SLinus Torvalds dirp = dentry->d_inode; 13201da177e4SLinus Torvalds 13211da177e4SLinus Torvalds err = nfserr_notdir; 1322acfa4380SAl Viro if (!dirp->i_op->lookup) 13231da177e4SLinus Torvalds goto out; 13241da177e4SLinus Torvalds /* 13251da177e4SLinus Torvalds * Check whether the response file handle has been verified yet. 13261da177e4SLinus Torvalds * If it has, the parent directory should already be locked. 13271da177e4SLinus Torvalds */ 13281da177e4SLinus Torvalds if (!resfhp->fh_dentry) { 13294a55c101SJan Kara host_err = fh_want_write(fhp); 13304a55c101SJan Kara if (host_err) 13314a55c101SJan Kara goto out_nfserr; 13324a55c101SJan Kara 13331da177e4SLinus Torvalds /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ 133412fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 13351da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 13366264d69dSAl Viro host_err = PTR_ERR(dchild); 13371da177e4SLinus Torvalds if (IS_ERR(dchild)) 13381da177e4SLinus Torvalds goto out_nfserr; 13391da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 13401da177e4SLinus Torvalds if (err) 13411da177e4SLinus Torvalds goto out; 13421da177e4SLinus Torvalds } else { 13431da177e4SLinus Torvalds /* called from nfsd_proc_create */ 13441da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 13451da177e4SLinus Torvalds if (!fhp->fh_locked) { 13461da177e4SLinus Torvalds /* not actually possible */ 13471da177e4SLinus Torvalds printk(KERN_ERR 1348a6a9f18fSAl Viro "nfsd_create: parent %pd2 not locked!\n", 1349a6a9f18fSAl Viro dentry); 1350d75f2b9fSAl Viro err = nfserr_io; 13511da177e4SLinus Torvalds goto out; 13521da177e4SLinus Torvalds } 13531da177e4SLinus Torvalds } 13541da177e4SLinus Torvalds /* 13551da177e4SLinus Torvalds * Make sure the child dentry is still negative ... 13561da177e4SLinus Torvalds */ 13571da177e4SLinus Torvalds err = nfserr_exist; 13581da177e4SLinus Torvalds if (dchild->d_inode) { 1359a6a9f18fSAl Viro dprintk("nfsd_create: dentry %pd/%pd not negative!\n", 1360a6a9f18fSAl Viro dentry, dchild); 13611da177e4SLinus Torvalds goto out; 13621da177e4SLinus Torvalds } 13631da177e4SLinus Torvalds 13641da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 13651da177e4SLinus Torvalds iap->ia_mode = 0; 13661da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 13671da177e4SLinus Torvalds 136807cad1d2SMiklos Szeredi err = nfserr_inval; 136907cad1d2SMiklos Szeredi if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { 137007cad1d2SMiklos Szeredi printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", 137107cad1d2SMiklos Szeredi type); 137207cad1d2SMiklos Szeredi goto out; 137307cad1d2SMiklos Szeredi } 137407cad1d2SMiklos Szeredi 13751da177e4SLinus Torvalds /* 13761da177e4SLinus Torvalds * Get the dir op function pointer. 13771da177e4SLinus Torvalds */ 1378088406bcSJ. Bruce Fields err = 0; 13794a55c101SJan Kara host_err = 0; 13801da177e4SLinus Torvalds switch (type) { 13811da177e4SLinus Torvalds case S_IFREG: 1382312b63fbSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, true); 13834ac35c2fSwengang wang if (!host_err) 13844ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 13851da177e4SLinus Torvalds break; 13861da177e4SLinus Torvalds case S_IFDIR: 13876264d69dSAl Viro host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); 13881da177e4SLinus Torvalds break; 13891da177e4SLinus Torvalds case S_IFCHR: 13901da177e4SLinus Torvalds case S_IFBLK: 13911da177e4SLinus Torvalds case S_IFIFO: 13921da177e4SLinus Torvalds case S_IFSOCK: 13936264d69dSAl Viro host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 13941da177e4SLinus Torvalds break; 1395463c3197SDave Hansen } 13964a55c101SJan Kara if (host_err < 0) 1397463c3197SDave Hansen goto out_nfserr; 13981da177e4SLinus Torvalds 1399f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 14001da177e4SLinus Torvalds 1401f501912aSBen Myers /* 1402f501912aSBen Myers * nfsd_setattr already committed the child. Transactional filesystems 1403f501912aSBen Myers * had a chance to commit changes for both parent and child 1404f501912aSBen Myers * simultaneously making the following commit_metadata a noop. 1405f501912aSBen Myers */ 1406f501912aSBen Myers err2 = nfserrno(commit_metadata(fhp)); 1407f193fbabSYAMAMOTO Takashi if (err2) 1408f193fbabSYAMAMOTO Takashi err = err2; 14091da177e4SLinus Torvalds /* 14101da177e4SLinus Torvalds * Update the file handle to get the new inode info. 14111da177e4SLinus Torvalds */ 14121da177e4SLinus Torvalds if (!err) 14131da177e4SLinus Torvalds err = fh_update(resfhp); 14141da177e4SLinus Torvalds out: 14151da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 14161da177e4SLinus Torvalds dput(dchild); 14171da177e4SLinus Torvalds return err; 14181da177e4SLinus Torvalds 14191da177e4SLinus Torvalds out_nfserr: 14206264d69dSAl Viro err = nfserrno(host_err); 14211da177e4SLinus Torvalds goto out; 14221da177e4SLinus Torvalds } 14231da177e4SLinus Torvalds 14241da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 1425ac6721a1SMi Jinlong 1426ac6721a1SMi Jinlong static inline int nfsd_create_is_exclusive(int createmode) 1427ac6721a1SMi Jinlong { 1428ac6721a1SMi Jinlong return createmode == NFS3_CREATE_EXCLUSIVE 1429ac6721a1SMi Jinlong || createmode == NFS4_CREATE_EXCLUSIVE4_1; 1430ac6721a1SMi Jinlong } 1431ac6721a1SMi Jinlong 14321da177e4SLinus Torvalds /* 1433ac6721a1SMi Jinlong * NFSv3 and NFSv4 version of nfsd_create 14341da177e4SLinus Torvalds */ 14356264d69dSAl Viro __be32 1436ac6721a1SMi Jinlong do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 14371da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 14381da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 1439856121b2SJ. Bruce Fields bool *truncp, bool *created) 14401da177e4SLinus Torvalds { 14411da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 14421da177e4SLinus Torvalds struct inode *dirp; 14436264d69dSAl Viro __be32 err; 14446264d69dSAl Viro int host_err; 14451da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 14461da177e4SLinus Torvalds 14471da177e4SLinus Torvalds err = nfserr_perm; 14481da177e4SLinus Torvalds if (!flen) 14491da177e4SLinus Torvalds goto out; 14501da177e4SLinus Torvalds err = nfserr_exist; 14511da177e4SLinus Torvalds if (isdotent(fname, flen)) 14521da177e4SLinus Torvalds goto out; 14531da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 14541da177e4SLinus Torvalds iap->ia_mode = 0; 14551574dff8SSachin Prabhu err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 14561da177e4SLinus Torvalds if (err) 14571da177e4SLinus Torvalds goto out; 14581da177e4SLinus Torvalds 14591da177e4SLinus Torvalds dentry = fhp->fh_dentry; 14601da177e4SLinus Torvalds dirp = dentry->d_inode; 14611da177e4SLinus Torvalds 14621da177e4SLinus Torvalds /* Get all the sanity checks out of the way before 14631da177e4SLinus Torvalds * we lock the parent. */ 14641da177e4SLinus Torvalds err = nfserr_notdir; 1465acfa4380SAl Viro if (!dirp->i_op->lookup) 14661da177e4SLinus Torvalds goto out; 14674a55c101SJan Kara 14684a55c101SJan Kara host_err = fh_want_write(fhp); 14694a55c101SJan Kara if (host_err) 14704a55c101SJan Kara goto out_nfserr; 14714a55c101SJan Kara 147212fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 14731da177e4SLinus Torvalds 14741da177e4SLinus Torvalds /* 14751da177e4SLinus Torvalds * Compose the response file handle. 14761da177e4SLinus Torvalds */ 14771da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 14786264d69dSAl Viro host_err = PTR_ERR(dchild); 14791da177e4SLinus Torvalds if (IS_ERR(dchild)) 14801da177e4SLinus Torvalds goto out_nfserr; 14811da177e4SLinus Torvalds 14821574dff8SSachin Prabhu /* If file doesn't exist, check for permissions to create one */ 14831574dff8SSachin Prabhu if (!dchild->d_inode) { 14841574dff8SSachin Prabhu err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 14851574dff8SSachin Prabhu if (err) 14861574dff8SSachin Prabhu goto out; 14871574dff8SSachin Prabhu } 14881574dff8SSachin Prabhu 14891da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 14901da177e4SLinus Torvalds if (err) 14911da177e4SLinus Torvalds goto out; 14921da177e4SLinus Torvalds 1493ac6721a1SMi Jinlong if (nfsd_create_is_exclusive(createmode)) { 1494c397852cSPeter Staubach /* solaris7 gets confused (bugid 4218508) if these have 1495749997e5SJeff Layton * the high bit set, so just clear the high bits. If this is 1496749997e5SJeff Layton * ever changed to use different attrs for storing the 1497749997e5SJeff Layton * verifier, then do_open_lookup() will also need to be fixed 1498749997e5SJeff Layton * accordingly. 14991da177e4SLinus Torvalds */ 15001da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 15011da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 15021da177e4SLinus Torvalds } 15031da177e4SLinus Torvalds 15041da177e4SLinus Torvalds if (dchild->d_inode) { 15051da177e4SLinus Torvalds err = 0; 15061da177e4SLinus Torvalds 15071da177e4SLinus Torvalds switch (createmode) { 15081da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 15091da177e4SLinus Torvalds if (! S_ISREG(dchild->d_inode->i_mode)) 15109dc4e6c4SJ. Bruce Fields goto out; 15111da177e4SLinus Torvalds else if (truncp) { 15121da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 15131da177e4SLinus Torvalds * differently. we don't want to truncate the 15141da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 15151da177e4SLinus Torvalds * fails for some other reason. furthermore, 15161da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 15171da177e4SLinus Torvalds * according to spec! 15181da177e4SLinus Torvalds */ 15191da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 15201da177e4SLinus Torvalds } 15211da177e4SLinus Torvalds else { 15221da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 15231da177e4SLinus Torvalds goto set_attr; 15241da177e4SLinus Torvalds } 15251da177e4SLinus Torvalds break; 15261da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 15271da177e4SLinus Torvalds if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 15281da177e4SLinus Torvalds && dchild->d_inode->i_atime.tv_sec == v_atime 15297007c90fSNeil Brown && dchild->d_inode->i_size == 0 ) { 15307007c90fSNeil Brown if (created) 15317007c90fSNeil Brown *created = 1; 15321da177e4SLinus Torvalds break; 15337007c90fSNeil Brown } 1534ac6721a1SMi Jinlong case NFS4_CREATE_EXCLUSIVE4_1: 1535ac6721a1SMi Jinlong if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 1536ac6721a1SMi Jinlong && dchild->d_inode->i_atime.tv_sec == v_atime 15377007c90fSNeil Brown && dchild->d_inode->i_size == 0 ) { 15387007c90fSNeil Brown if (created) 15397007c90fSNeil Brown *created = 1; 1540ac6721a1SMi Jinlong goto set_attr; 15417007c90fSNeil Brown } 15421da177e4SLinus Torvalds /* fallthru */ 15431da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 15441da177e4SLinus Torvalds err = nfserr_exist; 15451da177e4SLinus Torvalds } 1546bad0dcffSAl Viro fh_drop_write(fhp); 15471da177e4SLinus Torvalds goto out; 15481da177e4SLinus Torvalds } 15491da177e4SLinus Torvalds 1550312b63fbSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, true); 1551463c3197SDave Hansen if (host_err < 0) { 1552bad0dcffSAl Viro fh_drop_write(fhp); 15531da177e4SLinus Torvalds goto out_nfserr; 1554463c3197SDave Hansen } 155581ac95c5SJ. Bruce Fields if (created) 155681ac95c5SJ. Bruce Fields *created = 1; 15571da177e4SLinus Torvalds 15584ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 15594ac35c2fSwengang wang 1560ac6721a1SMi Jinlong if (nfsd_create_is_exclusive(createmode)) { 1561c397852cSPeter Staubach /* Cram the verifier into atime/mtime */ 15621da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 1563c397852cSPeter Staubach | ATTR_MTIME_SET|ATTR_ATIME_SET; 15641da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 15651da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 15661da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 15671da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 15681da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 15691da177e4SLinus Torvalds } 15701da177e4SLinus Torvalds 15711da177e4SLinus Torvalds set_attr: 1572f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 1573f501912aSBen Myers 1574f501912aSBen Myers /* 1575f501912aSBen Myers * nfsd_setattr already committed the child (and possibly also the parent). 1576f501912aSBen Myers */ 1577f501912aSBen Myers if (!err) 1578f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 1579f193fbabSYAMAMOTO Takashi 1580f193fbabSYAMAMOTO Takashi /* 1581f193fbabSYAMAMOTO Takashi * Update the filehandle to get the new inode info. 1582f193fbabSYAMAMOTO Takashi */ 1583f193fbabSYAMAMOTO Takashi if (!err) 1584f193fbabSYAMAMOTO Takashi err = fh_update(resfhp); 15851da177e4SLinus Torvalds 15861da177e4SLinus Torvalds out: 15871da177e4SLinus Torvalds fh_unlock(fhp); 15881da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 15891da177e4SLinus Torvalds dput(dchild); 15904a55c101SJan Kara fh_drop_write(fhp); 15911da177e4SLinus Torvalds return err; 15921da177e4SLinus Torvalds 15931da177e4SLinus Torvalds out_nfserr: 15946264d69dSAl Viro err = nfserrno(host_err); 15951da177e4SLinus Torvalds goto out; 15961da177e4SLinus Torvalds } 15971da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 15981da177e4SLinus Torvalds 15991da177e4SLinus Torvalds /* 16001da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 16011da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 16021da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 16031da177e4SLinus Torvalds */ 16046264d69dSAl Viro __be32 16051da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 16061da177e4SLinus Torvalds { 16071da177e4SLinus Torvalds struct inode *inode; 16081da177e4SLinus Torvalds mm_segment_t oldfs; 16096264d69dSAl Viro __be32 err; 16106264d69dSAl Viro int host_err; 161168ac1234SAl Viro struct path path; 16121da177e4SLinus Torvalds 16138837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); 16141da177e4SLinus Torvalds if (err) 16151da177e4SLinus Torvalds goto out; 16161da177e4SLinus Torvalds 161768ac1234SAl Viro path.mnt = fhp->fh_export->ex_path.mnt; 161868ac1234SAl Viro path.dentry = fhp->fh_dentry; 161968ac1234SAl Viro inode = path.dentry->d_inode; 16201da177e4SLinus Torvalds 16211da177e4SLinus Torvalds err = nfserr_inval; 1622acfa4380SAl Viro if (!inode->i_op->readlink) 16231da177e4SLinus Torvalds goto out; 16241da177e4SLinus Torvalds 162568ac1234SAl Viro touch_atime(&path); 16261da177e4SLinus Torvalds /* N.B. Why does this call need a get_fs()?? 16271da177e4SLinus Torvalds * Remove the set_fs and watch the fireworks:-) --okir 16281da177e4SLinus Torvalds */ 16291da177e4SLinus Torvalds 16301da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 1631fac7a17bSJ. Bruce Fields host_err = inode->i_op->readlink(path.dentry, (char __user *)buf, *lenp); 16321da177e4SLinus Torvalds set_fs(oldfs); 16331da177e4SLinus Torvalds 16346264d69dSAl Viro if (host_err < 0) 16351da177e4SLinus Torvalds goto out_nfserr; 16366264d69dSAl Viro *lenp = host_err; 16371da177e4SLinus Torvalds err = 0; 16381da177e4SLinus Torvalds out: 16391da177e4SLinus Torvalds return err; 16401da177e4SLinus Torvalds 16411da177e4SLinus Torvalds out_nfserr: 16426264d69dSAl Viro err = nfserrno(host_err); 16431da177e4SLinus Torvalds goto out; 16441da177e4SLinus Torvalds } 16451da177e4SLinus Torvalds 16461da177e4SLinus Torvalds /* 16471da177e4SLinus Torvalds * Create a symlink and look up its inode 16481da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 16491da177e4SLinus Torvalds */ 16506264d69dSAl Viro __be32 16511da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 16521da177e4SLinus Torvalds char *fname, int flen, 16531da177e4SLinus Torvalds char *path, int plen, 16541da177e4SLinus Torvalds struct svc_fh *resfhp, 16551da177e4SLinus Torvalds struct iattr *iap) 16561da177e4SLinus Torvalds { 16571da177e4SLinus Torvalds struct dentry *dentry, *dnew; 16586264d69dSAl Viro __be32 err, cerr; 16596264d69dSAl Viro int host_err; 16601da177e4SLinus Torvalds 16611da177e4SLinus Torvalds err = nfserr_noent; 16621da177e4SLinus Torvalds if (!flen || !plen) 16631da177e4SLinus Torvalds goto out; 16641da177e4SLinus Torvalds err = nfserr_exist; 16651da177e4SLinus Torvalds if (isdotent(fname, flen)) 16661da177e4SLinus Torvalds goto out; 16671da177e4SLinus Torvalds 16688837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 16691da177e4SLinus Torvalds if (err) 16701da177e4SLinus Torvalds goto out; 16714a55c101SJan Kara 16724a55c101SJan Kara host_err = fh_want_write(fhp); 16734a55c101SJan Kara if (host_err) 16744a55c101SJan Kara goto out_nfserr; 16754a55c101SJan Kara 16761da177e4SLinus Torvalds fh_lock(fhp); 16771da177e4SLinus Torvalds dentry = fhp->fh_dentry; 16781da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 16796264d69dSAl Viro host_err = PTR_ERR(dnew); 16801da177e4SLinus Torvalds if (IS_ERR(dnew)) 16811da177e4SLinus Torvalds goto out_nfserr; 16821da177e4SLinus Torvalds 16831da177e4SLinus Torvalds if (unlikely(path[plen] != 0)) { 16841da177e4SLinus Torvalds char *path_alloced = kmalloc(plen+1, GFP_KERNEL); 16851da177e4SLinus Torvalds if (path_alloced == NULL) 16866264d69dSAl Viro host_err = -ENOMEM; 16871da177e4SLinus Torvalds else { 16881da177e4SLinus Torvalds strncpy(path_alloced, path, plen); 16891da177e4SLinus Torvalds path_alloced[plen] = 0; 1690db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); 16911da177e4SLinus Torvalds kfree(path_alloced); 16921da177e4SLinus Torvalds } 16931da177e4SLinus Torvalds } else 1694db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path); 16956264d69dSAl Viro err = nfserrno(host_err); 1696f501912aSBen Myers if (!err) 1697f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 16981da177e4SLinus Torvalds fh_unlock(fhp); 16991da177e4SLinus Torvalds 1700bad0dcffSAl Viro fh_drop_write(fhp); 170175c3f29dSDave Hansen 17021da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 17031da177e4SLinus Torvalds dput(dnew); 17041da177e4SLinus Torvalds if (err==0) err = cerr; 17051da177e4SLinus Torvalds out: 17061da177e4SLinus Torvalds return err; 17071da177e4SLinus Torvalds 17081da177e4SLinus Torvalds out_nfserr: 17096264d69dSAl Viro err = nfserrno(host_err); 17101da177e4SLinus Torvalds goto out; 17111da177e4SLinus Torvalds } 17121da177e4SLinus Torvalds 17131da177e4SLinus Torvalds /* 17141da177e4SLinus Torvalds * Create a hardlink 17151da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 17161da177e4SLinus Torvalds */ 17176264d69dSAl Viro __be32 17181da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 17191da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 17201da177e4SLinus Torvalds { 17211da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 172255b13354SJ. Bruce Fields struct inode *dirp; 17236264d69dSAl Viro __be32 err; 17246264d69dSAl Viro int host_err; 17251da177e4SLinus Torvalds 17268837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); 17271da177e4SLinus Torvalds if (err) 17281da177e4SLinus Torvalds goto out; 17297d818a7bSJ. Bruce Fields err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); 17301da177e4SLinus Torvalds if (err) 17311da177e4SLinus Torvalds goto out; 17327d818a7bSJ. Bruce Fields err = nfserr_isdir; 17337d818a7bSJ. Bruce Fields if (S_ISDIR(tfhp->fh_dentry->d_inode->i_mode)) 17347d818a7bSJ. Bruce Fields goto out; 17351da177e4SLinus Torvalds err = nfserr_perm; 17361da177e4SLinus Torvalds if (!len) 17371da177e4SLinus Torvalds goto out; 17381da177e4SLinus Torvalds err = nfserr_exist; 17391da177e4SLinus Torvalds if (isdotent(name, len)) 17401da177e4SLinus Torvalds goto out; 17411da177e4SLinus Torvalds 17424a55c101SJan Kara host_err = fh_want_write(tfhp); 17434a55c101SJan Kara if (host_err) { 17444a55c101SJan Kara err = nfserrno(host_err); 17454a55c101SJan Kara goto out; 17464a55c101SJan Kara } 17474a55c101SJan Kara 174812fd3520SPeter Zijlstra fh_lock_nested(ffhp, I_MUTEX_PARENT); 17491da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 17501da177e4SLinus Torvalds dirp = ddir->d_inode; 17511da177e4SLinus Torvalds 17521da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 17536264d69dSAl Viro host_err = PTR_ERR(dnew); 17541da177e4SLinus Torvalds if (IS_ERR(dnew)) 17551da177e4SLinus Torvalds goto out_nfserr; 17561da177e4SLinus Torvalds 17571da177e4SLinus Torvalds dold = tfhp->fh_dentry; 17581da177e4SLinus Torvalds 17594795bb37SJ. Bruce Fields err = nfserr_noent; 17604795bb37SJ. Bruce Fields if (!dold->d_inode) 17614a55c101SJan Kara goto out_dput; 17624795bb37SJ. Bruce Fields host_err = nfsd_break_lease(dold->d_inode); 17637d751f6fSCasey Bodley if (host_err) { 17647d751f6fSCasey Bodley err = nfserrno(host_err); 17654a55c101SJan Kara goto out_dput; 17667d751f6fSCasey Bodley } 1767146a8595SJ. Bruce Fields host_err = vfs_link(dold, dirp, dnew, NULL); 17686264d69dSAl Viro if (!host_err) { 1769f501912aSBen Myers err = nfserrno(commit_metadata(ffhp)); 1770f501912aSBen Myers if (!err) 1771f501912aSBen Myers err = nfserrno(commit_metadata(tfhp)); 17721da177e4SLinus Torvalds } else { 17736264d69dSAl Viro if (host_err == -EXDEV && rqstp->rq_vers == 2) 17741da177e4SLinus Torvalds err = nfserr_acces; 17751da177e4SLinus Torvalds else 17766264d69dSAl Viro err = nfserrno(host_err); 17771da177e4SLinus Torvalds } 177875c3f29dSDave Hansen out_dput: 17791da177e4SLinus Torvalds dput(dnew); 1780270d56e5SDavid M. Richter out_unlock: 1781270d56e5SDavid M. Richter fh_unlock(ffhp); 17824a55c101SJan Kara fh_drop_write(tfhp); 17831da177e4SLinus Torvalds out: 17841da177e4SLinus Torvalds return err; 17851da177e4SLinus Torvalds 17861da177e4SLinus Torvalds out_nfserr: 17876264d69dSAl Viro err = nfserrno(host_err); 1788270d56e5SDavid M. Richter goto out_unlock; 17891da177e4SLinus Torvalds } 17901da177e4SLinus Torvalds 17911da177e4SLinus Torvalds /* 17921da177e4SLinus Torvalds * Rename a file 17931da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 17941da177e4SLinus Torvalds */ 17956264d69dSAl Viro __be32 17961da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 17971da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 17981da177e4SLinus Torvalds { 17991da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 18001da177e4SLinus Torvalds struct inode *fdir, *tdir; 18016264d69dSAl Viro __be32 err; 18026264d69dSAl Viro int host_err; 18031da177e4SLinus Torvalds 18048837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); 18051da177e4SLinus Torvalds if (err) 18061da177e4SLinus Torvalds goto out; 18078837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); 18081da177e4SLinus Torvalds if (err) 18091da177e4SLinus Torvalds goto out; 18101da177e4SLinus Torvalds 18111da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 18121da177e4SLinus Torvalds fdir = fdentry->d_inode; 18131da177e4SLinus Torvalds 18141da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 18151da177e4SLinus Torvalds tdir = tdentry->d_inode; 18161da177e4SLinus Torvalds 18171da177e4SLinus Torvalds err = nfserr_perm; 18181da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 18191da177e4SLinus Torvalds goto out; 18201da177e4SLinus Torvalds 18214a55c101SJan Kara host_err = fh_want_write(ffhp); 18224a55c101SJan Kara if (host_err) { 18234a55c101SJan Kara err = nfserrno(host_err); 18244a55c101SJan Kara goto out; 18254a55c101SJan Kara } 18264a55c101SJan Kara 18271da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 18281da177e4SLinus Torvalds * so do it by hand */ 18291da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 18301da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 1; 18311da177e4SLinus Torvalds fill_pre_wcc(ffhp); 18321da177e4SLinus Torvalds fill_pre_wcc(tfhp); 18331da177e4SLinus Torvalds 18341da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 18356264d69dSAl Viro host_err = PTR_ERR(odentry); 18361da177e4SLinus Torvalds if (IS_ERR(odentry)) 18371da177e4SLinus Torvalds goto out_nfserr; 18381da177e4SLinus Torvalds 18396264d69dSAl Viro host_err = -ENOENT; 18401da177e4SLinus Torvalds if (!odentry->d_inode) 18411da177e4SLinus Torvalds goto out_dput_old; 18426264d69dSAl Viro host_err = -EINVAL; 18431da177e4SLinus Torvalds if (odentry == trap) 18441da177e4SLinus Torvalds goto out_dput_old; 18451da177e4SLinus Torvalds 18461da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 18476264d69dSAl Viro host_err = PTR_ERR(ndentry); 18481da177e4SLinus Torvalds if (IS_ERR(ndentry)) 18491da177e4SLinus Torvalds goto out_dput_old; 18506264d69dSAl Viro host_err = -ENOTEMPTY; 18511da177e4SLinus Torvalds if (ndentry == trap) 18521da177e4SLinus Torvalds goto out_dput_new; 18531da177e4SLinus Torvalds 18549079b1ebSDave Hansen host_err = -EXDEV; 18559079b1ebSDave Hansen if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) 18569079b1ebSDave Hansen goto out_dput_new; 1857aa387d6cSJ. Bruce Fields if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry) 1858aa387d6cSJ. Bruce Fields goto out_dput_new; 18599079b1ebSDave Hansen 18604795bb37SJ. Bruce Fields host_err = nfsd_break_lease(odentry->d_inode); 18614795bb37SJ. Bruce Fields if (host_err) 18624a55c101SJan Kara goto out_dput_new; 186383f6b0c1SJ. Bruce Fields if (ndentry->d_inode) { 186483f6b0c1SJ. Bruce Fields host_err = nfsd_break_lease(ndentry->d_inode); 186583f6b0c1SJ. Bruce Fields if (host_err) 18664a55c101SJan Kara goto out_dput_new; 186783f6b0c1SJ. Bruce Fields } 18688e6d782cSJ. Bruce Fields host_err = vfs_rename(fdir, odentry, tdir, ndentry, NULL); 1869f501912aSBen Myers if (!host_err) { 1870f501912aSBen Myers host_err = commit_metadata(tfhp); 18716264d69dSAl Viro if (!host_err) 1872f501912aSBen Myers host_err = commit_metadata(ffhp); 18731da177e4SLinus Torvalds } 18741da177e4SLinus Torvalds out_dput_new: 18751da177e4SLinus Torvalds dput(ndentry); 18761da177e4SLinus Torvalds out_dput_old: 18771da177e4SLinus Torvalds dput(odentry); 18781da177e4SLinus Torvalds out_nfserr: 18796264d69dSAl Viro err = nfserrno(host_err); 18801da177e4SLinus Torvalds 18811da177e4SLinus Torvalds /* we cannot reply on fh_unlock on the two filehandles, 18821da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 18831da177e4SLinus Torvalds * were the same, so again we do it by hand 18841da177e4SLinus Torvalds */ 18851da177e4SLinus Torvalds fill_post_wcc(ffhp); 18861da177e4SLinus Torvalds fill_post_wcc(tfhp); 18871da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 18881da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 0; 18894a55c101SJan Kara fh_drop_write(ffhp); 18901da177e4SLinus Torvalds 18911da177e4SLinus Torvalds out: 18921da177e4SLinus Torvalds return err; 18931da177e4SLinus Torvalds } 18941da177e4SLinus Torvalds 18951da177e4SLinus Torvalds /* 18961da177e4SLinus Torvalds * Unlink a file or directory 18971da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 18981da177e4SLinus Torvalds */ 18996264d69dSAl Viro __be32 19001da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 19011da177e4SLinus Torvalds char *fname, int flen) 19021da177e4SLinus Torvalds { 19031da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 19041da177e4SLinus Torvalds struct inode *dirp; 19056264d69dSAl Viro __be32 err; 19066264d69dSAl Viro int host_err; 19071da177e4SLinus Torvalds 19081da177e4SLinus Torvalds err = nfserr_acces; 19091da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 19101da177e4SLinus Torvalds goto out; 19118837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); 19121da177e4SLinus Torvalds if (err) 19131da177e4SLinus Torvalds goto out; 19141da177e4SLinus Torvalds 19154a55c101SJan Kara host_err = fh_want_write(fhp); 19164a55c101SJan Kara if (host_err) 19174a55c101SJan Kara goto out_nfserr; 19184a55c101SJan Kara 191912fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 19201da177e4SLinus Torvalds dentry = fhp->fh_dentry; 19211da177e4SLinus Torvalds dirp = dentry->d_inode; 19221da177e4SLinus Torvalds 19231da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 19246264d69dSAl Viro host_err = PTR_ERR(rdentry); 19251da177e4SLinus Torvalds if (IS_ERR(rdentry)) 19261da177e4SLinus Torvalds goto out_nfserr; 19271da177e4SLinus Torvalds 19281da177e4SLinus Torvalds if (!rdentry->d_inode) { 19291da177e4SLinus Torvalds dput(rdentry); 19301da177e4SLinus Torvalds err = nfserr_noent; 19311da177e4SLinus Torvalds goto out; 19321da177e4SLinus Torvalds } 19331da177e4SLinus Torvalds 19341da177e4SLinus Torvalds if (!type) 19351da177e4SLinus Torvalds type = rdentry->d_inode->i_mode & S_IFMT; 19361da177e4SLinus Torvalds 19374795bb37SJ. Bruce Fields host_err = nfsd_break_lease(rdentry->d_inode); 19384795bb37SJ. Bruce Fields if (host_err) 19394a55c101SJan Kara goto out_put; 19409ce137eeSJ. Bruce Fields if (type != S_IFDIR) 1941b21996e3SJ. Bruce Fields host_err = vfs_unlink(dirp, rdentry, NULL); 19429ce137eeSJ. Bruce Fields else 19436264d69dSAl Viro host_err = vfs_rmdir(dirp, rdentry); 1944541ce98cSJ. Bruce Fields if (!host_err) 1945541ce98cSJ. Bruce Fields host_err = commit_metadata(fhp); 19464795bb37SJ. Bruce Fields out_put: 19471da177e4SLinus Torvalds dput(rdentry); 19481da177e4SLinus Torvalds 19491da177e4SLinus Torvalds out_nfserr: 19506264d69dSAl Viro err = nfserrno(host_err); 1951f193fbabSYAMAMOTO Takashi out: 1952f193fbabSYAMAMOTO Takashi return err; 19531da177e4SLinus Torvalds } 19541da177e4SLinus Torvalds 19551da177e4SLinus Torvalds /* 195614f7dd63SDavid Woodhouse * We do this buffering because we must not call back into the file 195714f7dd63SDavid Woodhouse * system's ->lookup() method from the filldir callback. That may well 195814f7dd63SDavid Woodhouse * deadlock a number of file systems. 195914f7dd63SDavid Woodhouse * 196014f7dd63SDavid Woodhouse * This is based heavily on the implementation of same in XFS. 196114f7dd63SDavid Woodhouse */ 196214f7dd63SDavid Woodhouse struct buffered_dirent { 196314f7dd63SDavid Woodhouse u64 ino; 196414f7dd63SDavid Woodhouse loff_t offset; 196514f7dd63SDavid Woodhouse int namlen; 196614f7dd63SDavid Woodhouse unsigned int d_type; 196714f7dd63SDavid Woodhouse char name[]; 196814f7dd63SDavid Woodhouse }; 196914f7dd63SDavid Woodhouse 197014f7dd63SDavid Woodhouse struct readdir_data { 19715c0ba4e0SAl Viro struct dir_context ctx; 197214f7dd63SDavid Woodhouse char *dirent; 197314f7dd63SDavid Woodhouse size_t used; 197453c9c5c0SAl Viro int full; 197514f7dd63SDavid Woodhouse }; 197614f7dd63SDavid Woodhouse 197714f7dd63SDavid Woodhouse static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, 197814f7dd63SDavid Woodhouse loff_t offset, u64 ino, unsigned int d_type) 197914f7dd63SDavid Woodhouse { 198014f7dd63SDavid Woodhouse struct readdir_data *buf = __buf; 198114f7dd63SDavid Woodhouse struct buffered_dirent *de = (void *)(buf->dirent + buf->used); 198214f7dd63SDavid Woodhouse unsigned int reclen; 198314f7dd63SDavid Woodhouse 198414f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); 198553c9c5c0SAl Viro if (buf->used + reclen > PAGE_SIZE) { 198653c9c5c0SAl Viro buf->full = 1; 198714f7dd63SDavid Woodhouse return -EINVAL; 198853c9c5c0SAl Viro } 198914f7dd63SDavid Woodhouse 199014f7dd63SDavid Woodhouse de->namlen = namlen; 199114f7dd63SDavid Woodhouse de->offset = offset; 199214f7dd63SDavid Woodhouse de->ino = ino; 199314f7dd63SDavid Woodhouse de->d_type = d_type; 199414f7dd63SDavid Woodhouse memcpy(de->name, name, namlen); 199514f7dd63SDavid Woodhouse buf->used += reclen; 199614f7dd63SDavid Woodhouse 199714f7dd63SDavid Woodhouse return 0; 199814f7dd63SDavid Woodhouse } 199914f7dd63SDavid Woodhouse 20002f9092e1SDavid Woodhouse static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func, 20012628b766SDavid Woodhouse struct readdir_cd *cdp, loff_t *offsetp) 20022628b766SDavid Woodhouse { 200314f7dd63SDavid Woodhouse struct buffered_dirent *de; 20042628b766SDavid Woodhouse int host_err; 200514f7dd63SDavid Woodhouse int size; 200614f7dd63SDavid Woodhouse loff_t offset; 2007ac6614b7SAl Viro struct readdir_data buf = { 2008ac6614b7SAl Viro .ctx.actor = nfsd_buffered_filldir, 2009ac6614b7SAl Viro .dirent = (void *)__get_free_page(GFP_KERNEL) 2010ac6614b7SAl Viro }; 20112628b766SDavid Woodhouse 201214f7dd63SDavid Woodhouse if (!buf.dirent) 20132f9092e1SDavid Woodhouse return nfserrno(-ENOMEM); 201414f7dd63SDavid Woodhouse 201514f7dd63SDavid Woodhouse offset = *offsetp; 20162628b766SDavid Woodhouse 201714f7dd63SDavid Woodhouse while (1) { 2018496ad9aaSAl Viro struct inode *dir_inode = file_inode(file); 201914f7dd63SDavid Woodhouse unsigned int reclen; 202014f7dd63SDavid Woodhouse 2021b726e923SDoug Nazar cdp->err = nfserr_eof; /* will be cleared on successful read */ 202214f7dd63SDavid Woodhouse buf.used = 0; 202353c9c5c0SAl Viro buf.full = 0; 202414f7dd63SDavid Woodhouse 20255c0ba4e0SAl Viro host_err = iterate_dir(file, &buf.ctx); 202653c9c5c0SAl Viro if (buf.full) 202753c9c5c0SAl Viro host_err = 0; 202853c9c5c0SAl Viro 202953c9c5c0SAl Viro if (host_err < 0) 203014f7dd63SDavid Woodhouse break; 203114f7dd63SDavid Woodhouse 203214f7dd63SDavid Woodhouse size = buf.used; 203314f7dd63SDavid Woodhouse 203414f7dd63SDavid Woodhouse if (!size) 203514f7dd63SDavid Woodhouse break; 203614f7dd63SDavid Woodhouse 20372f9092e1SDavid Woodhouse /* 20382f9092e1SDavid Woodhouse * Various filldir functions may end up calling back into 20392f9092e1SDavid Woodhouse * lookup_one_len() and the file system's ->lookup() method. 20402f9092e1SDavid Woodhouse * These expect i_mutex to be held, as it would within readdir. 20412f9092e1SDavid Woodhouse */ 20422f9092e1SDavid Woodhouse host_err = mutex_lock_killable(&dir_inode->i_mutex); 20432f9092e1SDavid Woodhouse if (host_err) 20442f9092e1SDavid Woodhouse break; 20452f9092e1SDavid Woodhouse 204614f7dd63SDavid Woodhouse de = (struct buffered_dirent *)buf.dirent; 204714f7dd63SDavid Woodhouse while (size > 0) { 204814f7dd63SDavid Woodhouse offset = de->offset; 204914f7dd63SDavid Woodhouse 205014f7dd63SDavid Woodhouse if (func(cdp, de->name, de->namlen, de->offset, 205114f7dd63SDavid Woodhouse de->ino, de->d_type)) 20522f9092e1SDavid Woodhouse break; 205314f7dd63SDavid Woodhouse 205414f7dd63SDavid Woodhouse if (cdp->err != nfs_ok) 20552f9092e1SDavid Woodhouse break; 205614f7dd63SDavid Woodhouse 205714f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(*de) + de->namlen, 205814f7dd63SDavid Woodhouse sizeof(u64)); 205914f7dd63SDavid Woodhouse size -= reclen; 206014f7dd63SDavid Woodhouse de = (struct buffered_dirent *)((char *)de + reclen); 206114f7dd63SDavid Woodhouse } 20622f9092e1SDavid Woodhouse mutex_unlock(&dir_inode->i_mutex); 20632f9092e1SDavid Woodhouse if (size > 0) /* We bailed out early */ 20642f9092e1SDavid Woodhouse break; 20652f9092e1SDavid Woodhouse 2066c002a6c7SDavid Woodhouse offset = vfs_llseek(file, 0, SEEK_CUR); 206714f7dd63SDavid Woodhouse } 206814f7dd63SDavid Woodhouse 206914f7dd63SDavid Woodhouse free_page((unsigned long)(buf.dirent)); 20702628b766SDavid Woodhouse 20712628b766SDavid Woodhouse if (host_err) 20722628b766SDavid Woodhouse return nfserrno(host_err); 207314f7dd63SDavid Woodhouse 207414f7dd63SDavid Woodhouse *offsetp = offset; 20752628b766SDavid Woodhouse return cdp->err; 20762628b766SDavid Woodhouse } 20772628b766SDavid Woodhouse 20781da177e4SLinus Torvalds /* 20791da177e4SLinus Torvalds * Read entries from a directory. 20801da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 20811da177e4SLinus Torvalds */ 20826264d69dSAl Viro __be32 20831da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 2084a0ad13efSNeilBrown struct readdir_cd *cdp, filldir_t func) 20851da177e4SLinus Torvalds { 20866264d69dSAl Viro __be32 err; 20871da177e4SLinus Torvalds struct file *file; 20881da177e4SLinus Torvalds loff_t offset = *offsetp; 208906effdbbSBernd Schubert int may_flags = NFSD_MAY_READ; 20901da177e4SLinus Torvalds 209106effdbbSBernd Schubert /* NFSv2 only supports 32 bit cookies */ 209206effdbbSBernd Schubert if (rqstp->rq_vers > 2) 209306effdbbSBernd Schubert may_flags |= NFSD_MAY_64BIT_COOKIE; 209406effdbbSBernd Schubert 209506effdbbSBernd Schubert err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file); 20961da177e4SLinus Torvalds if (err) 20971da177e4SLinus Torvalds goto out; 20981da177e4SLinus Torvalds 2099b108fe6bSJeff Layton offset = vfs_llseek(file, offset, SEEK_SET); 21001da177e4SLinus Torvalds if (offset < 0) { 21011da177e4SLinus Torvalds err = nfserrno((int)offset); 21021da177e4SLinus Torvalds goto out_close; 21031da177e4SLinus Torvalds } 21041da177e4SLinus Torvalds 210514f7dd63SDavid Woodhouse err = nfsd_buffered_readdir(file, func, cdp, offsetp); 21061da177e4SLinus Torvalds 21071da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 21081da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 21091da177e4SLinus Torvalds out_close: 21101da177e4SLinus Torvalds nfsd_close(file); 21111da177e4SLinus Torvalds out: 21121da177e4SLinus Torvalds return err; 21131da177e4SLinus Torvalds } 21141da177e4SLinus Torvalds 21151da177e4SLinus Torvalds /* 21161da177e4SLinus Torvalds * Get file system stats 21171da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 21181da177e4SLinus Torvalds */ 21196264d69dSAl Viro __be32 212004716e66SJ. Bruce Fields nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) 21211da177e4SLinus Torvalds { 2122f6360efbSTakashi Iwai __be32 err; 2123f6360efbSTakashi Iwai 2124f6360efbSTakashi Iwai err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); 2125f6360efbSTakashi Iwai if (!err) { 2126ebabe9a9SChristoph Hellwig struct path path = { 2127ebabe9a9SChristoph Hellwig .mnt = fhp->fh_export->ex_path.mnt, 2128ebabe9a9SChristoph Hellwig .dentry = fhp->fh_dentry, 2129ebabe9a9SChristoph Hellwig }; 2130f6360efbSTakashi Iwai if (vfs_statfs(&path, stat)) 21311da177e4SLinus Torvalds err = nfserr_io; 2132f6360efbSTakashi Iwai } 21331da177e4SLinus Torvalds return err; 21341da177e4SLinus Torvalds } 21351da177e4SLinus Torvalds 2136c7d51402SJ. Bruce Fields static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) 2137e22841c6SJ. Bruce Fields { 2138c7d51402SJ. Bruce Fields return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; 2139e22841c6SJ. Bruce Fields } 2140e22841c6SJ. Bruce Fields 21411da177e4SLinus Torvalds /* 21421da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 21431da177e4SLinus Torvalds */ 21446264d69dSAl Viro __be32 21450ec757dfSJ. Bruce Fields nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, 21460ec757dfSJ. Bruce Fields struct dentry *dentry, int acc) 21471da177e4SLinus Torvalds { 21481da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 21491da177e4SLinus Torvalds int err; 21501da177e4SLinus Torvalds 2151aea93397SJ. Bruce Fields if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) 21521da177e4SLinus Torvalds return 0; 21531da177e4SLinus Torvalds #if 0 21541da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 21551da177e4SLinus Torvalds acc, 21568837abcaSMiklos Szeredi (acc & NFSD_MAY_READ)? " read" : "", 21578837abcaSMiklos Szeredi (acc & NFSD_MAY_WRITE)? " write" : "", 21588837abcaSMiklos Szeredi (acc & NFSD_MAY_EXEC)? " exec" : "", 21598837abcaSMiklos Szeredi (acc & NFSD_MAY_SATTR)? " sattr" : "", 21608837abcaSMiklos Szeredi (acc & NFSD_MAY_TRUNC)? " trunc" : "", 21618837abcaSMiklos Szeredi (acc & NFSD_MAY_LOCK)? " lock" : "", 21628837abcaSMiklos Szeredi (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", 21631da177e4SLinus Torvalds inode->i_mode, 21641da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 21651da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 21662c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); 21671da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 21685cc0a840SDavid Howells inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); 21691da177e4SLinus Torvalds #endif 21701da177e4SLinus Torvalds 21711da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 21721da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 21731da177e4SLinus Torvalds * device special file, we ignore rofs. 21741da177e4SLinus Torvalds */ 21758837abcaSMiklos Szeredi if (!(acc & NFSD_MAY_LOCAL_ACCESS)) 21768837abcaSMiklos Szeredi if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { 21772c463e95SDave Hansen if (exp_rdonly(rqstp, exp) || 21782c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)) 21791da177e4SLinus Torvalds return nfserr_rofs; 21808837abcaSMiklos Szeredi if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) 21811da177e4SLinus Torvalds return nfserr_perm; 21821da177e4SLinus Torvalds } 21838837abcaSMiklos Szeredi if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) 21841da177e4SLinus Torvalds return nfserr_perm; 21851da177e4SLinus Torvalds 21868837abcaSMiklos Szeredi if (acc & NFSD_MAY_LOCK) { 21871da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 21881da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 21891da177e4SLinus Torvalds * ownership 21901da177e4SLinus Torvalds */ 21911da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 21921da177e4SLinus Torvalds return 0; 21931da177e4SLinus Torvalds else 21948837abcaSMiklos Szeredi acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; 21951da177e4SLinus Torvalds } 21961da177e4SLinus Torvalds /* 21971da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 21981da177e4SLinus Torvalds * would normally be checked at open time. This is to make 21991da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 22001da177e4SLinus Torvalds * 22011da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 22021da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 22031da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 22041da177e4SLinus Torvalds * always implies file truncation. 22051da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 22061da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 22071da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 22081da177e4SLinus Torvalds * with NFSv3. 22091da177e4SLinus Torvalds */ 22108837abcaSMiklos Szeredi if ((acc & NFSD_MAY_OWNER_OVERRIDE) && 22116fab8779SEric W. Biederman uid_eq(inode->i_uid, current_fsuid())) 22121da177e4SLinus Torvalds return 0; 22131da177e4SLinus Torvalds 22148837abcaSMiklos Szeredi /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ 2215f419a2e3SAl Viro err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); 22161da177e4SLinus Torvalds 22171da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 22181da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 2219a043226bSJ. Bruce Fields (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || 2220a043226bSJ. Bruce Fields acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) 2221f419a2e3SAl Viro err = inode_permission(inode, MAY_EXEC); 22221da177e4SLinus Torvalds 22231da177e4SLinus Torvalds return err? nfserrno(err) : 0; 22241da177e4SLinus Torvalds } 22251da177e4SLinus Torvalds 22261da177e4SLinus Torvalds void 22271da177e4SLinus Torvalds nfsd_racache_shutdown(void) 22281da177e4SLinus Torvalds { 222954a66e54SJeff Layton struct raparms *raparm, *last_raparm; 223054a66e54SJeff Layton unsigned int i; 223154a66e54SJeff Layton 22321da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 223354a66e54SJeff Layton 223454a66e54SJeff Layton for (i = 0; i < RAPARM_HASH_SIZE; i++) { 223554a66e54SJeff Layton raparm = raparm_hash[i].pb_head; 223654a66e54SJeff Layton while(raparm) { 223754a66e54SJeff Layton last_raparm = raparm; 223854a66e54SJeff Layton raparm = raparm->p_next; 223954a66e54SJeff Layton kfree(last_raparm); 224054a66e54SJeff Layton } 224154a66e54SJeff Layton raparm_hash[i].pb_head = NULL; 224254a66e54SJeff Layton } 22431da177e4SLinus Torvalds } 22441da177e4SLinus Torvalds /* 22451da177e4SLinus Torvalds * Initialize readahead param cache 22461da177e4SLinus Torvalds */ 22471da177e4SLinus Torvalds int 22481da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 22491da177e4SLinus Torvalds { 22501da177e4SLinus Torvalds int i; 2251fce1456aSGreg Banks int j = 0; 2252fce1456aSGreg Banks int nperbucket; 225354a66e54SJeff Layton struct raparms **raparm = NULL; 22541da177e4SLinus Torvalds 2255fce1456aSGreg Banks 225654a66e54SJeff Layton if (raparm_hash[0].pb_head) 22571da177e4SLinus Torvalds return 0; 225854a66e54SJeff Layton nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); 225954a66e54SJeff Layton if (nperbucket < 2) 226054a66e54SJeff Layton nperbucket = 2; 226154a66e54SJeff Layton cache_size = nperbucket * RAPARM_HASH_SIZE; 22624b3bb06bSYan Burman 22634b3bb06bSYan Burman dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); 226454a66e54SJeff Layton 2265fce1456aSGreg Banks for (i = 0; i < RAPARM_HASH_SIZE; i++) { 2266fce1456aSGreg Banks spin_lock_init(&raparm_hash[i].pb_lock); 226754a66e54SJeff Layton 226854a66e54SJeff Layton raparm = &raparm_hash[i].pb_head; 226954a66e54SJeff Layton for (j = 0; j < nperbucket; j++) { 227054a66e54SJeff Layton *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); 227154a66e54SJeff Layton if (!*raparm) 227254a66e54SJeff Layton goto out_nomem; 227354a66e54SJeff Layton raparm = &(*raparm)->p_next; 2274fce1456aSGreg Banks } 227554a66e54SJeff Layton *raparm = NULL; 22761da177e4SLinus Torvalds } 22774b3bb06bSYan Burman 22781da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 22791da177e4SLinus Torvalds return 0; 228054a66e54SJeff Layton 228154a66e54SJeff Layton out_nomem: 228254a66e54SJeff Layton dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); 228354a66e54SJeff Layton nfsd_racache_shutdown(); 228454a66e54SJeff Layton return -ENOMEM; 22851da177e4SLinus Torvalds } 2286a257cdd0SAndreas Gruenbacher 2287a257cdd0SAndreas Gruenbacher #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 2288a257cdd0SAndreas Gruenbacher struct posix_acl * 2289a257cdd0SAndreas Gruenbacher nfsd_get_posix_acl(struct svc_fh *fhp, int type) 2290a257cdd0SAndreas Gruenbacher { 2291a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2292a257cdd0SAndreas Gruenbacher char *name; 2293a257cdd0SAndreas Gruenbacher void *value = NULL; 2294a257cdd0SAndreas Gruenbacher ssize_t size; 2295a257cdd0SAndreas Gruenbacher struct posix_acl *acl; 2296a257cdd0SAndreas Gruenbacher 22975be196e5SChristoph Hellwig if (!IS_POSIXACL(inode)) 2298a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 22995be196e5SChristoph Hellwig 2300a257cdd0SAndreas Gruenbacher switch (type) { 2301a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2302334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2303a257cdd0SAndreas Gruenbacher break; 2304a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2305334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2306a257cdd0SAndreas Gruenbacher break; 2307a257cdd0SAndreas Gruenbacher default: 2308a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 2309a257cdd0SAndreas Gruenbacher } 2310a257cdd0SAndreas Gruenbacher 23115be196e5SChristoph Hellwig size = nfsd_getxattr(fhp->fh_dentry, name, &value); 23125be196e5SChristoph Hellwig if (size < 0) 23135be196e5SChristoph Hellwig return ERR_PTR(size); 2314a257cdd0SAndreas Gruenbacher 23155f3a4a28SEric W. Biederman acl = posix_acl_from_xattr(&init_user_ns, value, size); 2316a257cdd0SAndreas Gruenbacher kfree(value); 2317a257cdd0SAndreas Gruenbacher return acl; 2318a257cdd0SAndreas Gruenbacher } 2319a257cdd0SAndreas Gruenbacher 2320a257cdd0SAndreas Gruenbacher int 2321a257cdd0SAndreas Gruenbacher nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) 2322a257cdd0SAndreas Gruenbacher { 2323a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2324a257cdd0SAndreas Gruenbacher char *name; 2325a257cdd0SAndreas Gruenbacher void *value = NULL; 2326a257cdd0SAndreas Gruenbacher size_t size; 2327a257cdd0SAndreas Gruenbacher int error; 2328a257cdd0SAndreas Gruenbacher 2329acfa4380SAl Viro if (!IS_POSIXACL(inode) || 2330a257cdd0SAndreas Gruenbacher !inode->i_op->setxattr || !inode->i_op->removexattr) 2331a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2332a257cdd0SAndreas Gruenbacher switch(type) { 2333a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2334334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2335a257cdd0SAndreas Gruenbacher break; 2336a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2337334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2338a257cdd0SAndreas Gruenbacher break; 2339a257cdd0SAndreas Gruenbacher default: 2340a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2341a257cdd0SAndreas Gruenbacher } 2342a257cdd0SAndreas Gruenbacher 2343a257cdd0SAndreas Gruenbacher if (acl && acl->a_count) { 2344334a13ecSChristoph Hellwig size = posix_acl_xattr_size(acl->a_count); 2345a257cdd0SAndreas Gruenbacher value = kmalloc(size, GFP_KERNEL); 2346a257cdd0SAndreas Gruenbacher if (!value) 2347a257cdd0SAndreas Gruenbacher return -ENOMEM; 23485f3a4a28SEric W. Biederman error = posix_acl_to_xattr(&init_user_ns, acl, value, size); 23499ccfc29cSFlorin Malita if (error < 0) 2350a257cdd0SAndreas Gruenbacher goto getout; 23519ccfc29cSFlorin Malita size = error; 2352a257cdd0SAndreas Gruenbacher } else 2353a257cdd0SAndreas Gruenbacher size = 0; 2354a257cdd0SAndreas Gruenbacher 2355bad0dcffSAl Viro error = fh_want_write(fhp); 235618f335afSDave Hansen if (error) 235718f335afSDave Hansen goto getout; 2358a257cdd0SAndreas Gruenbacher if (size) 23595be196e5SChristoph Hellwig error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); 2360a257cdd0SAndreas Gruenbacher else { 2361a257cdd0SAndreas Gruenbacher if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) 2362a257cdd0SAndreas Gruenbacher error = 0; 2363a257cdd0SAndreas Gruenbacher else { 23645be196e5SChristoph Hellwig error = vfs_removexattr(fhp->fh_dentry, name); 2365a257cdd0SAndreas Gruenbacher if (error == -ENODATA) 2366a257cdd0SAndreas Gruenbacher error = 0; 2367a257cdd0SAndreas Gruenbacher } 2368a257cdd0SAndreas Gruenbacher } 2369bad0dcffSAl Viro fh_drop_write(fhp); 2370a257cdd0SAndreas Gruenbacher 2371a257cdd0SAndreas Gruenbacher getout: 2372a257cdd0SAndreas Gruenbacher kfree(value); 2373a257cdd0SAndreas Gruenbacher return error; 2374a257cdd0SAndreas Gruenbacher } 2375a257cdd0SAndreas Gruenbacher #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ 2376