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> 319a74af21SBoaz Harrosh 329a74af21SBoaz Harrosh #ifdef CONFIG_NFSD_V3 339a74af21SBoaz Harrosh #include "xdr3.h" 349a74af21SBoaz Harrosh #endif /* CONFIG_NFSD_V3 */ 359a74af21SBoaz Harrosh 365be196e5SChristoph Hellwig #ifdef CONFIG_NFSD_V4 372ca72e17SJ. Bruce Fields #include "acl.h" 382ca72e17SJ. Bruce Fields #include "idmap.h" 391da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V4 */ 401da177e4SLinus Torvalds 419a74af21SBoaz Harrosh #include "nfsd.h" 429a74af21SBoaz Harrosh #include "vfs.h" 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds #define NFSDDBG_FACILITY NFSDDBG_FILEOP 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds /* 481da177e4SLinus Torvalds * This is a cache of readahead params that help us choose the proper 491da177e4SLinus Torvalds * readahead strategy. Initially, we set all readahead parameters to 0 501da177e4SLinus Torvalds * and let the VFS handle things. 511da177e4SLinus Torvalds * If you increase the number of cached files very much, you'll need to 521da177e4SLinus Torvalds * add a hash table here. 531da177e4SLinus Torvalds */ 541da177e4SLinus Torvalds struct raparms { 551da177e4SLinus Torvalds struct raparms *p_next; 561da177e4SLinus Torvalds unsigned int p_count; 571da177e4SLinus Torvalds ino_t p_ino; 581da177e4SLinus Torvalds dev_t p_dev; 591da177e4SLinus Torvalds int p_set; 601da177e4SLinus Torvalds struct file_ra_state p_ra; 61fce1456aSGreg Banks unsigned int p_hindex; 621da177e4SLinus Torvalds }; 631da177e4SLinus Torvalds 64fce1456aSGreg Banks struct raparm_hbucket { 65fce1456aSGreg Banks struct raparms *pb_head; 66fce1456aSGreg Banks spinlock_t pb_lock; 67fce1456aSGreg Banks } ____cacheline_aligned_in_smp; 68fce1456aSGreg Banks 69fce1456aSGreg Banks #define RAPARM_HASH_BITS 4 70fce1456aSGreg Banks #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) 71fce1456aSGreg Banks #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) 72fce1456aSGreg Banks static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds /* 751da177e4SLinus Torvalds * Called from nfsd_lookup and encode_dirent. Check if we have crossed 761da177e4SLinus Torvalds * a mount point. 77e0bb89efSJ.Bruce Fields * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, 781da177e4SLinus Torvalds * or nfs_ok having possibly changed *dpp and *expp 791da177e4SLinus Torvalds */ 801da177e4SLinus Torvalds int 811da177e4SLinus Torvalds nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 821da177e4SLinus Torvalds struct svc_export **expp) 831da177e4SLinus Torvalds { 841da177e4SLinus Torvalds struct svc_export *exp = *expp, *exp2 = NULL; 851da177e4SLinus Torvalds struct dentry *dentry = *dpp; 8691c9fa8fSAl Viro struct path path = {.mnt = mntget(exp->ex_path.mnt), 8791c9fa8fSAl Viro .dentry = dget(dentry)}; 886264d69dSAl Viro int err = 0; 891da177e4SLinus Torvalds 909393bd07SAl Viro while (d_mountpoint(path.dentry) && follow_down(&path)) 9191c9fa8fSAl Viro ; 921da177e4SLinus Torvalds 9391c9fa8fSAl Viro exp2 = rqst_exp_get_by_name(rqstp, &path); 941da177e4SLinus Torvalds if (IS_ERR(exp2)) { 951da177e4SLinus Torvalds err = PTR_ERR(exp2); 963b6cee7bSJ. Bruce Fields /* 973b6cee7bSJ. Bruce Fields * We normally allow NFS clients to continue 983b6cee7bSJ. Bruce Fields * "underneath" a mountpoint that is not exported. 993b6cee7bSJ. Bruce Fields * The exception is V4ROOT, where no traversal is ever 1003b6cee7bSJ. Bruce Fields * allowed without an explicit export of the new 1013b6cee7bSJ. Bruce Fields * directory. 1023b6cee7bSJ. Bruce Fields */ 1033b6cee7bSJ. Bruce Fields if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) 1043b6cee7bSJ. Bruce Fields err = 0; 10591c9fa8fSAl Viro path_put(&path); 1061da177e4SLinus Torvalds goto out; 1071da177e4SLinus Torvalds } 1083c394ddaSSteve Dickson if (nfsd_v4client(rqstp) || 1093c394ddaSSteve Dickson (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { 1101da177e4SLinus Torvalds /* successfully crossed mount point */ 1111644ccc8SAl Viro /* 11291c9fa8fSAl Viro * This is subtle: path.dentry is *not* on path.mnt 11391c9fa8fSAl Viro * at this point. The only reason we are safe is that 11491c9fa8fSAl Viro * original mnt is pinned down by exp, so we should 11591c9fa8fSAl Viro * put path *before* putting exp 1161644ccc8SAl Viro */ 11791c9fa8fSAl Viro *dpp = path.dentry; 11891c9fa8fSAl Viro path.dentry = dentry; 1191644ccc8SAl Viro *expp = exp2; 12091c9fa8fSAl Viro exp2 = exp; 1211da177e4SLinus Torvalds } 12291c9fa8fSAl Viro path_put(&path); 12391c9fa8fSAl Viro exp_put(exp2); 1241da177e4SLinus Torvalds out: 1251da177e4SLinus Torvalds return err; 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 128289ede45SJ. Bruce Fields static void follow_to_parent(struct path *path) 129289ede45SJ. Bruce Fields { 130289ede45SJ. Bruce Fields struct dentry *dp; 131289ede45SJ. Bruce Fields 132289ede45SJ. Bruce Fields while (path->dentry == path->mnt->mnt_root && follow_up(path)) 133289ede45SJ. Bruce Fields ; 134289ede45SJ. Bruce Fields dp = dget_parent(path->dentry); 135289ede45SJ. Bruce Fields dput(path->dentry); 136289ede45SJ. Bruce Fields path->dentry = dp; 137289ede45SJ. Bruce Fields } 138289ede45SJ. Bruce Fields 139289ede45SJ. Bruce Fields static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) 140289ede45SJ. Bruce Fields { 141289ede45SJ. Bruce Fields struct svc_export *exp2; 142289ede45SJ. Bruce Fields struct path path = {.mnt = mntget((*exp)->ex_path.mnt), 143289ede45SJ. Bruce Fields .dentry = dget(dparent)}; 144289ede45SJ. Bruce Fields 145289ede45SJ. Bruce Fields follow_to_parent(&path); 146289ede45SJ. Bruce Fields 147289ede45SJ. Bruce Fields exp2 = rqst_exp_parent(rqstp, &path); 148289ede45SJ. Bruce Fields if (PTR_ERR(exp2) == -ENOENT) { 149289ede45SJ. Bruce Fields *dentryp = dget(dparent); 150289ede45SJ. Bruce Fields } else if (IS_ERR(exp2)) { 151289ede45SJ. Bruce Fields path_put(&path); 152289ede45SJ. Bruce Fields return PTR_ERR(exp2); 153289ede45SJ. Bruce Fields } else { 154289ede45SJ. Bruce Fields *dentryp = dget(path.dentry); 155289ede45SJ. Bruce Fields exp_put(*exp); 156289ede45SJ. Bruce Fields *exp = exp2; 157289ede45SJ. Bruce Fields } 158289ede45SJ. Bruce Fields path_put(&path); 159289ede45SJ. Bruce Fields return 0; 160289ede45SJ. Bruce Fields } 161289ede45SJ. Bruce Fields 16282ead7feSJ. Bruce Fields /* 16382ead7feSJ. Bruce Fields * For nfsd purposes, we treat V4ROOT exports as though there was an 16482ead7feSJ. Bruce Fields * export at *every* directory. 16582ead7feSJ. Bruce Fields */ 1663227fa41SJ. Bruce Fields int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) 16782ead7feSJ. Bruce Fields { 16882ead7feSJ. Bruce Fields if (d_mountpoint(dentry)) 16982ead7feSJ. Bruce Fields return 1; 17082ead7feSJ. Bruce Fields if (!(exp->ex_flags & NFSEXP_V4ROOT)) 17182ead7feSJ. Bruce Fields return 0; 17282ead7feSJ. Bruce Fields return dentry->d_inode != NULL; 17382ead7feSJ. Bruce Fields } 17482ead7feSJ. Bruce Fields 1756264d69dSAl Viro __be32 1766c0a654dSJ. Bruce Fields nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, 1775a022fc8SChuck Lever const char *name, unsigned int len, 1786c0a654dSJ. Bruce Fields struct svc_export **exp_ret, struct dentry **dentry_ret) 1791da177e4SLinus Torvalds { 1801da177e4SLinus Torvalds struct svc_export *exp; 1811da177e4SLinus Torvalds struct dentry *dparent; 1821da177e4SLinus Torvalds struct dentry *dentry; 1836264d69dSAl Viro __be32 err; 1846264d69dSAl Viro int host_err; 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds /* Obtain dentry and export. */ 1898837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 1901da177e4SLinus Torvalds if (err) 1911da177e4SLinus Torvalds return err; 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds dparent = fhp->fh_dentry; 1941da177e4SLinus Torvalds exp = fhp->fh_export; 1951da177e4SLinus Torvalds exp_get(exp); 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds /* Lookup the name, but don't follow links */ 1981da177e4SLinus Torvalds if (isdotent(name, len)) { 1991da177e4SLinus Torvalds if (len==1) 2001da177e4SLinus Torvalds dentry = dget(dparent); 20154775491SJan Blunck else if (dparent != exp->ex_path.dentry) 2021da177e4SLinus Torvalds dentry = dget_parent(dparent); 203fed83811SJ. Bruce Fields else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) 2041da177e4SLinus Torvalds dentry = dget(dparent); /* .. == . just like at / */ 2051da177e4SLinus Torvalds else { 2061da177e4SLinus Torvalds /* checking mountpoint crossing is very different when stepping up */ 207289ede45SJ. Bruce Fields host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); 208289ede45SJ. Bruce Fields if (host_err) 2091da177e4SLinus Torvalds goto out_nfserr; 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds } else { 2121da177e4SLinus Torvalds fh_lock(fhp); 2131da177e4SLinus Torvalds dentry = lookup_one_len(name, dparent, len); 2146264d69dSAl Viro host_err = PTR_ERR(dentry); 2151da177e4SLinus Torvalds if (IS_ERR(dentry)) 2161da177e4SLinus Torvalds goto out_nfserr; 2171da177e4SLinus Torvalds /* 2181da177e4SLinus Torvalds * check if we have crossed a mount point ... 2191da177e4SLinus Torvalds */ 22082ead7feSJ. Bruce Fields if (nfsd_mountpoint(dentry, exp)) { 2216264d69dSAl Viro if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 2221da177e4SLinus Torvalds dput(dentry); 2231da177e4SLinus Torvalds goto out_nfserr; 2241da177e4SLinus Torvalds } 2251da177e4SLinus Torvalds } 2261da177e4SLinus Torvalds } 2276c0a654dSJ. Bruce Fields *dentry_ret = dentry; 2286c0a654dSJ. Bruce Fields *exp_ret = exp; 2296c0a654dSJ. Bruce Fields return 0; 2306c0a654dSJ. Bruce Fields 2316c0a654dSJ. Bruce Fields out_nfserr: 2326c0a654dSJ. Bruce Fields exp_put(exp); 2336c0a654dSJ. Bruce Fields return nfserrno(host_err); 2346c0a654dSJ. Bruce Fields } 2356c0a654dSJ. Bruce Fields 2366c0a654dSJ. Bruce Fields /* 2376c0a654dSJ. Bruce Fields * Look up one component of a pathname. 2386c0a654dSJ. Bruce Fields * N.B. After this call _both_ fhp and resfh need an fh_put 2396c0a654dSJ. Bruce Fields * 2406c0a654dSJ. Bruce Fields * If the lookup would cross a mountpoint, and the mounted filesystem 2416c0a654dSJ. Bruce Fields * is exported to the client with NFSEXP_NOHIDE, then the lookup is 2426c0a654dSJ. Bruce Fields * accepted as it stands and the mounted directory is 2436c0a654dSJ. Bruce Fields * returned. Otherwise the covered directory is returned. 2446c0a654dSJ. Bruce Fields * NOTE: this mountpoint crossing is not supported properly by all 2456c0a654dSJ. Bruce Fields * clients and is explicitly disallowed for NFSv3 2466c0a654dSJ. Bruce Fields * NeilBrown <neilb@cse.unsw.edu.au> 2476c0a654dSJ. Bruce Fields */ 2486c0a654dSJ. Bruce Fields __be32 2496c0a654dSJ. Bruce Fields nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 2505a022fc8SChuck Lever unsigned int len, struct svc_fh *resfh) 2516c0a654dSJ. Bruce Fields { 2526c0a654dSJ. Bruce Fields struct svc_export *exp; 2536c0a654dSJ. Bruce Fields struct dentry *dentry; 2546c0a654dSJ. Bruce Fields __be32 err; 2556c0a654dSJ. Bruce Fields 2566c0a654dSJ. Bruce Fields err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); 2576c0a654dSJ. Bruce Fields if (err) 2586c0a654dSJ. Bruce Fields return err; 25932c1eb0cSAndy Adamson err = check_nfsd_access(exp, rqstp); 26032c1eb0cSAndy Adamson if (err) 26132c1eb0cSAndy Adamson goto out; 2621da177e4SLinus Torvalds /* 2631da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2641da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2651da177e4SLinus Torvalds */ 2661da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2671da177e4SLinus Torvalds if (!err && !dentry->d_inode) 2681da177e4SLinus Torvalds err = nfserr_noent; 26932c1eb0cSAndy Adamson out: 2701da177e4SLinus Torvalds dput(dentry); 2711da177e4SLinus Torvalds exp_put(exp); 2721da177e4SLinus Torvalds return err; 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds 275f501912aSBen Myers /* 276f501912aSBen Myers * Commit metadata changes to stable storage. 277f501912aSBen Myers */ 278f501912aSBen Myers static int 279f501912aSBen Myers commit_metadata(struct svc_fh *fhp) 280f501912aSBen Myers { 281f501912aSBen Myers struct inode *inode = fhp->fh_dentry->d_inode; 282f501912aSBen Myers const struct export_operations *export_ops = inode->i_sb->s_export_op; 283f501912aSBen Myers 284f501912aSBen Myers if (!EX_ISSYNC(fhp->fh_export)) 285f501912aSBen Myers return 0; 286f501912aSBen Myers 287c3765016SChristoph Hellwig if (export_ops->commit_metadata) 288c3765016SChristoph Hellwig return export_ops->commit_metadata(inode); 289c3765016SChristoph Hellwig return sync_inode_metadata(inode, 1); 290f501912aSBen Myers } 2916c0a654dSJ. Bruce Fields 2921da177e4SLinus Torvalds /* 2931da177e4SLinus Torvalds * Set various file attributes. 2941da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 2951da177e4SLinus Torvalds */ 2966264d69dSAl Viro __be32 2971da177e4SLinus Torvalds nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 2981da177e4SLinus Torvalds int check_guard, time_t guardtime) 2991da177e4SLinus Torvalds { 3001da177e4SLinus Torvalds struct dentry *dentry; 3011da177e4SLinus Torvalds struct inode *inode; 3028837abcaSMiklos Szeredi int accmode = NFSD_MAY_SATTR; 3031da177e4SLinus Torvalds int ftype = 0; 3046264d69dSAl Viro __be32 err; 3056264d69dSAl Viro int host_err; 3061da177e4SLinus Torvalds int size_change = 0; 3071da177e4SLinus Torvalds 3081da177e4SLinus Torvalds if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) 3098837abcaSMiklos Szeredi accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; 3101da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) 3111da177e4SLinus Torvalds ftype = S_IFREG; 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds /* Get inode */ 3141da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 31515b7a1b8SNeilBrown if (err) 3161da177e4SLinus Torvalds goto out; 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds dentry = fhp->fh_dentry; 3191da177e4SLinus Torvalds inode = dentry->d_inode; 3201da177e4SLinus Torvalds 32115b7a1b8SNeilBrown /* Ignore any mode updates on symlinks */ 32215b7a1b8SNeilBrown if (S_ISLNK(inode->i_mode)) 32315b7a1b8SNeilBrown iap->ia_valid &= ~ATTR_MODE; 32415b7a1b8SNeilBrown 32515b7a1b8SNeilBrown if (!iap->ia_valid) 32615b7a1b8SNeilBrown goto out; 32715b7a1b8SNeilBrown 3289c85fca5SChristoph Hellwig /* 3299c85fca5SChristoph Hellwig * NFSv2 does not differentiate between "set-[ac]time-to-now" 3301da177e4SLinus Torvalds * which only requires access, and "set-[ac]time-to-X" which 3311da177e4SLinus Torvalds * requires ownership. 3321da177e4SLinus Torvalds * So if it looks like it might be "set both to the same time which 3331da177e4SLinus Torvalds * is close to now", and if inode_change_ok fails, then we 3341da177e4SLinus Torvalds * convert to "set to now" instead of "set to explicit time" 3351da177e4SLinus Torvalds * 3361da177e4SLinus Torvalds * We only call inode_change_ok as the last test as technically 3371da177e4SLinus Torvalds * it is not an interface that we should be using. It is only 3381da177e4SLinus Torvalds * valid if the filesystem does not define it's own i_op->setattr. 3391da177e4SLinus Torvalds */ 3401da177e4SLinus Torvalds #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) 3411da177e4SLinus Torvalds #define MAX_TOUCH_TIME_ERROR (30*60) 3429c85fca5SChristoph Hellwig if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && 3439c85fca5SChristoph Hellwig iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { 3449c85fca5SChristoph Hellwig /* 3459c85fca5SChristoph Hellwig * Looks probable. 3469c85fca5SChristoph Hellwig * 3479c85fca5SChristoph Hellwig * Now just make sure time is in the right ballpark. 3489c85fca5SChristoph Hellwig * Solaris, at least, doesn't seem to care what the time 3499c85fca5SChristoph Hellwig * request is. We require it be within 30 minutes of now. 3501da177e4SLinus Torvalds */ 3511da177e4SLinus Torvalds time_t delta = iap->ia_atime.tv_sec - get_seconds(); 3529c85fca5SChristoph Hellwig if (delta < 0) 3539c85fca5SChristoph Hellwig delta = -delta; 3541da177e4SLinus Torvalds if (delta < MAX_TOUCH_TIME_ERROR && 3551da177e4SLinus Torvalds inode_change_ok(inode, iap) != 0) { 3569c85fca5SChristoph Hellwig /* 3579c85fca5SChristoph Hellwig * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. 3589c85fca5SChristoph Hellwig * This will cause notify_change to set these times 3599c85fca5SChristoph Hellwig * to "now" 3601da177e4SLinus Torvalds */ 3611da177e4SLinus Torvalds iap->ia_valid &= ~BOTH_TIME_SET; 3621da177e4SLinus Torvalds } 3631da177e4SLinus Torvalds } 3641da177e4SLinus Torvalds 3659c85fca5SChristoph Hellwig /* 3669c85fca5SChristoph Hellwig * The size case is special. 3679c85fca5SChristoph Hellwig * It changes the file as well as the attributes. 3689c85fca5SChristoph Hellwig */ 3691da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) { 3701da177e4SLinus Torvalds if (iap->ia_size < inode->i_size) { 3718837abcaSMiklos Szeredi err = nfsd_permission(rqstp, fhp->fh_export, dentry, 3728837abcaSMiklos Szeredi NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE); 3731da177e4SLinus Torvalds if (err) 3741da177e4SLinus Torvalds goto out; 3751da177e4SLinus Torvalds } 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds /* 3781da177e4SLinus Torvalds * If we are changing the size of the file, then 3791da177e4SLinus Torvalds * we need to break all leases. 3801da177e4SLinus Torvalds */ 3818737c930SAl Viro host_err = break_lease(inode, O_WRONLY | O_NONBLOCK); 3826264d69dSAl Viro if (host_err) /* ENOMEM or EWOULDBLOCK */ 3831da177e4SLinus Torvalds goto out_nfserr; 3841da177e4SLinus Torvalds 3856264d69dSAl Viro host_err = get_write_access(inode); 3866264d69dSAl Viro if (host_err) 3871da177e4SLinus Torvalds goto out_nfserr; 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds size_change = 1; 3906264d69dSAl Viro host_err = locks_verify_truncate(inode, NULL, iap->ia_size); 3916264d69dSAl Viro if (host_err) { 3921da177e4SLinus Torvalds put_write_access(inode); 3931da177e4SLinus Torvalds goto out_nfserr; 3941da177e4SLinus Torvalds } 3951da177e4SLinus Torvalds } 3961da177e4SLinus Torvalds 397ca456252SJeff Layton /* sanitize the mode change */ 3981da177e4SLinus Torvalds if (iap->ia_valid & ATTR_MODE) { 3991da177e4SLinus Torvalds iap->ia_mode &= S_IALLUGO; 400dee3209dSJeff Layton iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); 4011da177e4SLinus Torvalds } 402ca456252SJeff Layton 403ca456252SJeff Layton /* Revoke setuid/setgid on chown */ 4040953e620SSachin S. Prabhu if (!S_ISDIR(inode->i_mode) && 4050953e620SSachin S. Prabhu (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) || 4060953e620SSachin S. Prabhu ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) { 407ca456252SJeff Layton iap->ia_valid |= ATTR_KILL_PRIV; 408ca456252SJeff Layton if (iap->ia_valid & ATTR_MODE) { 409ca456252SJeff Layton /* we're setting mode too, just clear the s*id bits */ 410ca456252SJeff Layton iap->ia_mode &= ~S_ISUID; 411ca456252SJeff Layton if (iap->ia_mode & S_IXGRP) 4128a0ce7d9SJeff Layton iap->ia_mode &= ~S_ISGID; 4138a0ce7d9SJeff Layton } else { 414ca456252SJeff Layton /* set ATTR_KILL_* bits and let VFS handle it */ 415ca456252SJeff Layton iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); 416ca456252SJeff Layton } 4178a0ce7d9SJeff Layton } 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds /* Change the attributes. */ 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds err = nfserr_notsync; 4241da177e4SLinus Torvalds if (!check_guard || guardtime == inode->i_ctime.tv_sec) { 4251da177e4SLinus Torvalds fh_lock(fhp); 4266264d69dSAl Viro host_err = notify_change(dentry, iap); 4276264d69dSAl Viro err = nfserrno(host_err); 4281da177e4SLinus Torvalds fh_unlock(fhp); 4291da177e4SLinus Torvalds } 4301da177e4SLinus Torvalds if (size_change) 4311da177e4SLinus Torvalds put_write_access(inode); 4321da177e4SLinus Torvalds if (!err) 433b160fdabSChristoph Hellwig commit_metadata(fhp); 4341da177e4SLinus Torvalds out: 4351da177e4SLinus Torvalds return err; 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds out_nfserr: 4386264d69dSAl Viro err = nfserrno(host_err); 4391da177e4SLinus Torvalds goto out; 4401da177e4SLinus Torvalds } 4411da177e4SLinus Torvalds 4425be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V2_ACL) || \ 4435be196e5SChristoph Hellwig defined(CONFIG_NFSD_V3_ACL) || \ 4445be196e5SChristoph Hellwig defined(CONFIG_NFSD_V4) 4455be196e5SChristoph Hellwig static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) 4465be196e5SChristoph Hellwig { 4475be196e5SChristoph Hellwig ssize_t buflen; 4486c6a426fSKrishna Kumar ssize_t ret; 4491da177e4SLinus Torvalds 4505be196e5SChristoph Hellwig buflen = vfs_getxattr(dentry, key, NULL, 0); 4515be196e5SChristoph Hellwig if (buflen <= 0) 4525be196e5SChristoph Hellwig return buflen; 4535be196e5SChristoph Hellwig 4545be196e5SChristoph Hellwig *buf = kmalloc(buflen, GFP_KERNEL); 4555be196e5SChristoph Hellwig if (!*buf) 4565be196e5SChristoph Hellwig return -ENOMEM; 4575be196e5SChristoph Hellwig 4586c6a426fSKrishna Kumar ret = vfs_getxattr(dentry, key, *buf, buflen); 4596c6a426fSKrishna Kumar if (ret < 0) 4606c6a426fSKrishna Kumar kfree(*buf); 4616c6a426fSKrishna Kumar return ret; 4625be196e5SChristoph Hellwig } 4635be196e5SChristoph Hellwig #endif 4645be196e5SChristoph Hellwig 4655be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V4) 4661da177e4SLinus Torvalds static int 4671da177e4SLinus Torvalds set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) 4681da177e4SLinus Torvalds { 4691da177e4SLinus Torvalds int len; 4701da177e4SLinus Torvalds size_t buflen; 4711da177e4SLinus Torvalds char *buf = NULL; 4721da177e4SLinus Torvalds int error = 0; 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds buflen = posix_acl_xattr_size(pacl->a_count); 4751da177e4SLinus Torvalds buf = kmalloc(buflen, GFP_KERNEL); 4761da177e4SLinus Torvalds error = -ENOMEM; 4771da177e4SLinus Torvalds if (buf == NULL) 4781da177e4SLinus Torvalds goto out; 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds len = posix_acl_to_xattr(pacl, buf, buflen); 4811da177e4SLinus Torvalds if (len < 0) { 4821da177e4SLinus Torvalds error = len; 4831da177e4SLinus Torvalds goto out; 4841da177e4SLinus Torvalds } 4851da177e4SLinus Torvalds 4865be196e5SChristoph Hellwig error = vfs_setxattr(dentry, key, buf, len, 0); 4871da177e4SLinus Torvalds out: 4881da177e4SLinus Torvalds kfree(buf); 4891da177e4SLinus Torvalds return error; 4901da177e4SLinus Torvalds } 4911da177e4SLinus Torvalds 4926264d69dSAl Viro __be32 4931da177e4SLinus Torvalds nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, 4941da177e4SLinus Torvalds struct nfs4_acl *acl) 4951da177e4SLinus Torvalds { 4966264d69dSAl Viro __be32 error; 4976264d69dSAl Viro int host_error; 4981da177e4SLinus Torvalds struct dentry *dentry; 4991da177e4SLinus Torvalds struct inode *inode; 5001da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 5011da177e4SLinus Torvalds unsigned int flags = 0; 5021da177e4SLinus Torvalds 5031da177e4SLinus Torvalds /* Get inode */ 5048837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); 5051da177e4SLinus Torvalds if (error) 5064b2ca38aSJ. Bruce Fields return error; 5071da177e4SLinus Torvalds 5081da177e4SLinus Torvalds dentry = fhp->fh_dentry; 5091da177e4SLinus Torvalds inode = dentry->d_inode; 5101da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) 5111da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5121da177e4SLinus Torvalds 5136264d69dSAl Viro host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); 5146264d69dSAl Viro if (host_error == -EINVAL) { 5154b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 5166264d69dSAl Viro } else if (host_error < 0) 5171da177e4SLinus Torvalds goto out_nfserr; 5181da177e4SLinus Torvalds 5196264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); 5206264d69dSAl Viro if (host_error < 0) 5214b2ca38aSJ. Bruce Fields goto out_release; 5221da177e4SLinus Torvalds 5234b2ca38aSJ. Bruce Fields if (S_ISDIR(inode->i_mode)) 5246264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); 5251da177e4SLinus Torvalds 5264b2ca38aSJ. Bruce Fields out_release: 5271da177e4SLinus Torvalds posix_acl_release(pacl); 5281da177e4SLinus Torvalds posix_acl_release(dpacl); 5291da177e4SLinus Torvalds out_nfserr: 530f34f9242SJ. Bruce Fields if (host_error == -EOPNOTSUPP) 5314b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 532f34f9242SJ. Bruce Fields else 5334b2ca38aSJ. Bruce Fields return nfserrno(host_error); 5341da177e4SLinus Torvalds } 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds static struct posix_acl * 5371da177e4SLinus Torvalds _get_posix_acl(struct dentry *dentry, char *key) 5381da177e4SLinus Torvalds { 5395be196e5SChristoph Hellwig void *buf = NULL; 5401da177e4SLinus Torvalds struct posix_acl *pacl = NULL; 5415be196e5SChristoph Hellwig int buflen; 5421da177e4SLinus Torvalds 5435be196e5SChristoph Hellwig buflen = nfsd_getxattr(dentry, key, &buf); 5445be196e5SChristoph Hellwig if (!buflen) 5455be196e5SChristoph Hellwig buflen = -ENODATA; 5465be196e5SChristoph Hellwig if (buflen <= 0) 5475be196e5SChristoph Hellwig return ERR_PTR(buflen); 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds pacl = posix_acl_from_xattr(buf, buflen); 5501da177e4SLinus Torvalds kfree(buf); 5511da177e4SLinus Torvalds return pacl; 5521da177e4SLinus Torvalds } 5531da177e4SLinus Torvalds 5541da177e4SLinus Torvalds int 5551da177e4SLinus Torvalds nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) 5561da177e4SLinus Torvalds { 5571da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 5581da177e4SLinus Torvalds int error = 0; 5591da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 5601da177e4SLinus Torvalds unsigned int flags = 0; 5611da177e4SLinus Torvalds 5629a59f452SChristoph Hellwig pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); 5631da177e4SLinus Torvalds if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) 5641da177e4SLinus Torvalds pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 5651da177e4SLinus Torvalds if (IS_ERR(pacl)) { 5661da177e4SLinus Torvalds error = PTR_ERR(pacl); 5671da177e4SLinus Torvalds pacl = NULL; 5681da177e4SLinus Torvalds goto out; 5691da177e4SLinus Torvalds } 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) { 5729a59f452SChristoph Hellwig dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); 5731da177e4SLinus Torvalds if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) 5741da177e4SLinus Torvalds dpacl = NULL; 5751da177e4SLinus Torvalds else if (IS_ERR(dpacl)) { 5761da177e4SLinus Torvalds error = PTR_ERR(dpacl); 5771da177e4SLinus Torvalds dpacl = NULL; 5781da177e4SLinus Torvalds goto out; 5791da177e4SLinus Torvalds } 5801da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5811da177e4SLinus Torvalds } 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); 5841da177e4SLinus Torvalds if (IS_ERR(*acl)) { 5851da177e4SLinus Torvalds error = PTR_ERR(*acl); 5861da177e4SLinus Torvalds *acl = NULL; 5871da177e4SLinus Torvalds } 5881da177e4SLinus Torvalds out: 5891da177e4SLinus Torvalds posix_acl_release(pacl); 5901da177e4SLinus Torvalds posix_acl_release(dpacl); 5911da177e4SLinus Torvalds return error; 5921da177e4SLinus Torvalds } 5931da177e4SLinus Torvalds 5946a85d6c7SJ. Bruce Fields #endif /* defined(CONFIG_NFSD_V4) */ 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 5971da177e4SLinus Torvalds /* 5981da177e4SLinus Torvalds * Check server access rights to a file system object 5991da177e4SLinus Torvalds */ 6001da177e4SLinus Torvalds struct accessmap { 6011da177e4SLinus Torvalds u32 access; 6021da177e4SLinus Torvalds int how; 6031da177e4SLinus Torvalds }; 6041da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 6058837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6068837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6078837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, 6088837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds { 0, 0 } 6111da177e4SLinus Torvalds }; 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 6148837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6158837abcaSMiklos Szeredi { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, 6168837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, 6178837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, 6188837abcaSMiklos Szeredi { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds { 0, 0 } 6211da177e4SLinus Torvalds }; 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 6241da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 6251da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 6261da177e4SLinus Torvalds * (which really, the server doesn't care about). So 6271da177e4SLinus Torvalds * We provide simple access checking for them, looking 6281da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 6291da177e4SLinus Torvalds * filesystem checks 6301da177e4SLinus Torvalds */ 6318837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6328837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6338837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6348837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds { 0, 0 } 6371da177e4SLinus Torvalds }; 6381da177e4SLinus Torvalds 6396264d69dSAl Viro __be32 6401da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 6411da177e4SLinus Torvalds { 6421da177e4SLinus Torvalds struct accessmap *map; 6431da177e4SLinus Torvalds struct svc_export *export; 6441da177e4SLinus Torvalds struct dentry *dentry; 6451da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 6466264d69dSAl Viro __be32 error; 6471da177e4SLinus Torvalds 6488837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 6491da177e4SLinus Torvalds if (error) 6501da177e4SLinus Torvalds goto out; 6511da177e4SLinus Torvalds 6521da177e4SLinus Torvalds export = fhp->fh_export; 6531da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds if (S_ISREG(dentry->d_inode->i_mode)) 6561da177e4SLinus Torvalds map = nfs3_regaccess; 6571da177e4SLinus Torvalds else if (S_ISDIR(dentry->d_inode->i_mode)) 6581da177e4SLinus Torvalds map = nfs3_diraccess; 6591da177e4SLinus Torvalds else 6601da177e4SLinus Torvalds map = nfs3_anyaccess; 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds query = *access; 6641da177e4SLinus Torvalds for (; map->access; map++) { 6651da177e4SLinus Torvalds if (map->access & query) { 6666264d69dSAl Viro __be32 err2; 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds sresult |= map->access; 6691da177e4SLinus Torvalds 6700ec757dfSJ. Bruce Fields err2 = nfsd_permission(rqstp, export, dentry, map->how); 6711da177e4SLinus Torvalds switch (err2) { 6721da177e4SLinus Torvalds case nfs_ok: 6731da177e4SLinus Torvalds result |= map->access; 6741da177e4SLinus Torvalds break; 6751da177e4SLinus Torvalds 6761da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 6771da177e4SLinus Torvalds * rather than an error occurred */ 6781da177e4SLinus Torvalds case nfserr_rofs: 6791da177e4SLinus Torvalds case nfserr_acces: 6801da177e4SLinus Torvalds case nfserr_perm: 6811da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 6821da177e4SLinus Torvalds break; 6831da177e4SLinus Torvalds default: 6841da177e4SLinus Torvalds error = err2; 6851da177e4SLinus Torvalds goto out; 6861da177e4SLinus Torvalds } 6871da177e4SLinus Torvalds } 6881da177e4SLinus Torvalds } 6891da177e4SLinus Torvalds *access = result; 6901da177e4SLinus Torvalds if (supported) 6911da177e4SLinus Torvalds *supported = sresult; 6921da177e4SLinus Torvalds 6931da177e4SLinus Torvalds out: 6941da177e4SLinus Torvalds return error; 6951da177e4SLinus Torvalds } 6961da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds /* 7011da177e4SLinus Torvalds * Open an existing file or directory. 7021da177e4SLinus Torvalds * The access argument indicates the type of open (read/write/lock) 7031da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 7041da177e4SLinus Torvalds */ 7056264d69dSAl Viro __be32 7061da177e4SLinus Torvalds nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 7071da177e4SLinus Torvalds int access, struct file **filp) 7081da177e4SLinus Torvalds { 7091da177e4SLinus Torvalds struct dentry *dentry; 7101da177e4SLinus Torvalds struct inode *inode; 7116264d69dSAl Viro int flags = O_RDONLY|O_LARGEFILE; 7126264d69dSAl Viro __be32 err; 71391885258SJeff Layton int host_err = 0; 7141da177e4SLinus Torvalds 715e0e81739SDavid Howells validate_process_creds(); 716e0e81739SDavid Howells 7171da177e4SLinus Torvalds /* 7181da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 7191da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 7201da177e4SLinus Torvalds * in case a chmod has now revoked permission. 7211da177e4SLinus Torvalds */ 7228837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE); 7231da177e4SLinus Torvalds if (err) 7241da177e4SLinus Torvalds goto out; 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds dentry = fhp->fh_dentry; 7271da177e4SLinus Torvalds inode = dentry->d_inode; 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 7301da177e4SLinus Torvalds * or any access when mandatory locking enabled 7311da177e4SLinus Torvalds */ 7321da177e4SLinus Torvalds err = nfserr_perm; 7338837abcaSMiklos Szeredi if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE)) 7341da177e4SLinus Torvalds goto out; 7355e7fc436SJ. Bruce Fields /* 7365e7fc436SJ. Bruce Fields * We must ignore files (but only files) which might have mandatory 7375e7fc436SJ. Bruce Fields * locks on them because there is no way to know if the accesser has 7385e7fc436SJ. Bruce Fields * the lock. 7395e7fc436SJ. Bruce Fields */ 7405e7fc436SJ. Bruce Fields if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) 7411da177e4SLinus Torvalds goto out; 7421da177e4SLinus Torvalds 7431da177e4SLinus Torvalds if (!inode->i_fop) 7441da177e4SLinus Torvalds goto out; 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds /* 7471da177e4SLinus Torvalds * Check to see if there are any leases on this file. 7481da177e4SLinus Torvalds * This may block while leases are broken. 7491da177e4SLinus Torvalds */ 75091885258SJeff Layton if (!(access & NFSD_MAY_NOT_BREAK_LEASE)) 7518737c930SAl Viro host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? O_WRONLY : 0)); 7526264d69dSAl Viro if (host_err) /* NOMEM or WOULDBLOCK */ 7531da177e4SLinus Torvalds goto out_nfserr; 7541da177e4SLinus Torvalds 7558837abcaSMiklos Szeredi if (access & NFSD_MAY_WRITE) { 7568837abcaSMiklos Szeredi if (access & NFSD_MAY_READ) 7579ecb6a08SJ. Bruce Fields flags = O_RDWR|O_LARGEFILE; 7589ecb6a08SJ. Bruce Fields else 7591da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 7601da177e4SLinus Torvalds } 76154775491SJan Blunck *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt), 762033a666cSDavid Howells flags, current_cred()); 7631da177e4SLinus Torvalds if (IS_ERR(*filp)) 7646264d69dSAl Viro host_err = PTR_ERR(*filp); 765aeaa5ccdSChuck Ebbert else 7669bbb6cadSMimi Zohar host_err = ima_file_check(*filp, access); 7671da177e4SLinus Torvalds out_nfserr: 7686264d69dSAl Viro err = nfserrno(host_err); 7691da177e4SLinus Torvalds out: 770e0e81739SDavid Howells validate_process_creds(); 7711da177e4SLinus Torvalds return err; 7721da177e4SLinus Torvalds } 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvalds /* 7751da177e4SLinus Torvalds * Close a file. 7761da177e4SLinus Torvalds */ 7771da177e4SLinus Torvalds void 7781da177e4SLinus Torvalds nfsd_close(struct file *filp) 7791da177e4SLinus Torvalds { 7801da177e4SLinus Torvalds fput(filp); 7811da177e4SLinus Torvalds } 7821da177e4SLinus Torvalds 7839a8d248eSJ. Bruce Fields /* 7841da177e4SLinus Torvalds * Obtain the readahead parameters for the file 7851da177e4SLinus Torvalds * specified by (dev, ino). 7861da177e4SLinus Torvalds */ 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds static inline struct raparms * 7891da177e4SLinus Torvalds nfsd_get_raparms(dev_t dev, ino_t ino) 7901da177e4SLinus Torvalds { 7911da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 7921da177e4SLinus Torvalds int depth = 0; 793fce1456aSGreg Banks unsigned int hash; 794fce1456aSGreg Banks struct raparm_hbucket *rab; 7951da177e4SLinus Torvalds 796fce1456aSGreg Banks hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; 797fce1456aSGreg Banks rab = &raparm_hash[hash]; 798fce1456aSGreg Banks 799fce1456aSGreg Banks spin_lock(&rab->pb_lock); 800fce1456aSGreg Banks for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { 8011da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 8021da177e4SLinus Torvalds goto found; 8031da177e4SLinus Torvalds depth++; 8041da177e4SLinus Torvalds if (ra->p_count == 0) 8051da177e4SLinus Torvalds frap = rap; 8061da177e4SLinus Torvalds } 8071da177e4SLinus Torvalds depth = nfsdstats.ra_size*11/10; 8081da177e4SLinus Torvalds if (!frap) { 809fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8101da177e4SLinus Torvalds return NULL; 8111da177e4SLinus Torvalds } 8121da177e4SLinus Torvalds rap = frap; 8131da177e4SLinus Torvalds ra = *frap; 8141da177e4SLinus Torvalds ra->p_dev = dev; 8151da177e4SLinus Torvalds ra->p_ino = ino; 8161da177e4SLinus Torvalds ra->p_set = 0; 817fce1456aSGreg Banks ra->p_hindex = hash; 8181da177e4SLinus Torvalds found: 819fce1456aSGreg Banks if (rap != &rab->pb_head) { 8201da177e4SLinus Torvalds *rap = ra->p_next; 821fce1456aSGreg Banks ra->p_next = rab->pb_head; 822fce1456aSGreg Banks rab->pb_head = ra; 8231da177e4SLinus Torvalds } 8241da177e4SLinus Torvalds ra->p_count++; 8251da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 826fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8271da177e4SLinus Torvalds return ra; 8281da177e4SLinus Torvalds } 8291da177e4SLinus Torvalds 8301da177e4SLinus Torvalds /* 831cf8208d0SJens Axboe * Grab and keep cached pages associated with a file in the svc_rqst 832cf8208d0SJens Axboe * so that they can be passed to the network sendmsg/sendpage routines 833cf8208d0SJens Axboe * directly. They will be released after the sending has completed. 8341da177e4SLinus Torvalds */ 8351da177e4SLinus Torvalds static int 836cf8208d0SJens Axboe nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, 837cf8208d0SJens Axboe struct splice_desc *sd) 8381da177e4SLinus Torvalds { 839cf8208d0SJens Axboe struct svc_rqst *rqstp = sd->u.data; 84044524359SNeilBrown struct page **pp = rqstp->rq_respages + rqstp->rq_resused; 841cf8208d0SJens Axboe struct page *page = buf->page; 842cf8208d0SJens Axboe size_t size; 843cf8208d0SJens Axboe int ret; 8441da177e4SLinus Torvalds 845cac36bb0SJens Axboe ret = buf->ops->confirm(pipe, buf); 846cf8208d0SJens Axboe if (unlikely(ret)) 847cf8208d0SJens Axboe return ret; 848cf8208d0SJens Axboe 849cf8208d0SJens Axboe size = sd->len; 8501da177e4SLinus Torvalds 8511da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 8521da177e4SLinus Torvalds get_page(page); 85344524359SNeilBrown put_page(*pp); 85444524359SNeilBrown *pp = page; 85544524359SNeilBrown rqstp->rq_resused++; 856cf8208d0SJens Axboe rqstp->rq_res.page_base = buf->offset; 8571da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 85844524359SNeilBrown } else if (page != pp[-1]) { 8591da177e4SLinus Torvalds get_page(page); 860250f3915SNeilBrown if (*pp) 86144524359SNeilBrown put_page(*pp); 86244524359SNeilBrown *pp = page; 86344524359SNeilBrown rqstp->rq_resused++; 8641da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 86544524359SNeilBrown } else 8661da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8671da177e4SLinus Torvalds 8681da177e4SLinus Torvalds return size; 8691da177e4SLinus Torvalds } 8701da177e4SLinus Torvalds 871cf8208d0SJens Axboe static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, 872cf8208d0SJens Axboe struct splice_desc *sd) 873cf8208d0SJens Axboe { 874cf8208d0SJens Axboe return __splice_from_pipe(pipe, sd, nfsd_splice_actor); 875cf8208d0SJens Axboe } 876cf8208d0SJens Axboe 8776264d69dSAl Viro static __be32 8781da177e4SLinus Torvalds nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 8791da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 8801da177e4SLinus Torvalds { 8811da177e4SLinus Torvalds struct inode *inode; 8821da177e4SLinus Torvalds mm_segment_t oldfs; 8836264d69dSAl Viro __be32 err; 8846264d69dSAl Viro int host_err; 8851da177e4SLinus Torvalds 8861da177e4SLinus Torvalds err = nfserr_perm; 8877eaa36e2SJosef "Jeff" Sipek inode = file->f_path.dentry->d_inode; 888a8754beeSDave Hansen 889cf8208d0SJens Axboe if (file->f_op->splice_read && rqstp->rq_splice_ok) { 890cf8208d0SJens Axboe struct splice_desc sd = { 891cf8208d0SJens Axboe .len = 0, 892cf8208d0SJens Axboe .total_len = *count, 893cf8208d0SJens Axboe .pos = offset, 894cf8208d0SJens Axboe .u.data = rqstp, 895cf8208d0SJens Axboe }; 896cf8208d0SJens Axboe 8974fbef206SJens Axboe rqstp->rq_resused = 1; 898cf8208d0SJens Axboe host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); 8991da177e4SLinus Torvalds } else { 9001da177e4SLinus Torvalds oldfs = get_fs(); 9011da177e4SLinus Torvalds set_fs(KERNEL_DS); 9026264d69dSAl Viro host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); 9031da177e4SLinus Torvalds set_fs(oldfs); 9041da177e4SLinus Torvalds } 9051da177e4SLinus Torvalds 9066264d69dSAl Viro if (host_err >= 0) { 9076264d69dSAl Viro nfsdstats.io_read += host_err; 9086264d69dSAl Viro *count = host_err; 9091da177e4SLinus Torvalds err = 0; 9102a12a9d7SEric Paris fsnotify_access(file); 9111da177e4SLinus Torvalds } else 9126264d69dSAl Viro err = nfserrno(host_err); 9131da177e4SLinus Torvalds return err; 9141da177e4SLinus Torvalds } 9151da177e4SLinus Torvalds 9169f708e40SNeil Brown static void kill_suid(struct dentry *dentry) 9179f708e40SNeil Brown { 9189f708e40SNeil Brown struct iattr ia; 919b5376771SSerge E. Hallyn ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; 9209f708e40SNeil Brown 9211b1dcc1bSJes Sorensen mutex_lock(&dentry->d_inode->i_mutex); 9229f708e40SNeil Brown notify_change(dentry, &ia); 9231b1dcc1bSJes Sorensen mutex_unlock(&dentry->d_inode->i_mutex); 9249f708e40SNeil Brown } 9259f708e40SNeil Brown 926d911df7bSJ. Bruce Fields /* 927d911df7bSJ. Bruce Fields * Gathered writes: If another process is currently writing to the file, 928d911df7bSJ. Bruce Fields * there's a high chance this is another nfsd (triggered by a bulk write 929d911df7bSJ. Bruce Fields * from a client's biod). Rather than syncing the file with each write 930d911df7bSJ. Bruce Fields * request, we sleep for 10 msec. 931d911df7bSJ. Bruce Fields * 932d911df7bSJ. Bruce Fields * I don't know if this roughly approximates C. Juszak's idea of 933d911df7bSJ. Bruce Fields * gathered writes, but it's a nice and simple solution (IMHO), and it 934d911df7bSJ. Bruce Fields * seems to work:-) 935d911df7bSJ. Bruce Fields * 936d911df7bSJ. Bruce Fields * Note: we do this only in the NFSv2 case, since v3 and higher have a 937d911df7bSJ. Bruce Fields * better tool (separate unstable writes and commits) for solving this 938d911df7bSJ. Bruce Fields * problem. 939d911df7bSJ. Bruce Fields */ 940d911df7bSJ. Bruce Fields static int wait_for_concurrent_writes(struct file *file) 941d911df7bSJ. Bruce Fields { 942d911df7bSJ. Bruce Fields struct inode *inode = file->f_path.dentry->d_inode; 943d911df7bSJ. Bruce Fields static ino_t last_ino; 944d911df7bSJ. Bruce Fields static dev_t last_dev; 945d911df7bSJ. Bruce Fields int err = 0; 946d911df7bSJ. Bruce Fields 947d911df7bSJ. Bruce Fields if (atomic_read(&inode->i_writecount) > 1 948d911df7bSJ. Bruce Fields || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 949d911df7bSJ. Bruce Fields dprintk("nfsd: write defer %d\n", task_pid_nr(current)); 950d911df7bSJ. Bruce Fields msleep(10); 951d911df7bSJ. Bruce Fields dprintk("nfsd: write resume %d\n", task_pid_nr(current)); 952d911df7bSJ. Bruce Fields } 953d911df7bSJ. Bruce Fields 954d911df7bSJ. Bruce Fields if (inode->i_state & I_DIRTY) { 955d911df7bSJ. Bruce Fields dprintk("nfsd: write sync %d\n", task_pid_nr(current)); 9568018ab05SChristoph Hellwig err = vfs_fsync(file, 0); 957d911df7bSJ. Bruce Fields } 958d911df7bSJ. Bruce Fields last_ino = inode->i_ino; 959d911df7bSJ. Bruce Fields last_dev = inode->i_sb->s_dev; 960d911df7bSJ. Bruce Fields return err; 961d911df7bSJ. Bruce Fields } 962d911df7bSJ. Bruce Fields 9636264d69dSAl Viro static __be32 9641da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 9651da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 96631dec253SDavid Shaw unsigned long *cnt, int *stablep) 9671da177e4SLinus Torvalds { 9681da177e4SLinus Torvalds struct svc_export *exp; 9691da177e4SLinus Torvalds struct dentry *dentry; 9701da177e4SLinus Torvalds struct inode *inode; 9711da177e4SLinus Torvalds mm_segment_t oldfs; 9726264d69dSAl Viro __be32 err = 0; 9736264d69dSAl Viro int host_err; 9741da177e4SLinus Torvalds int stable = *stablep; 97548e03bc5STrond Myklebust int use_wgather; 9761da177e4SLinus Torvalds 9777eaa36e2SJosef "Jeff" Sipek dentry = file->f_path.dentry; 9781da177e4SLinus Torvalds inode = dentry->d_inode; 9791da177e4SLinus Torvalds exp = fhp->fh_export; 9801da177e4SLinus Torvalds 9811da177e4SLinus Torvalds /* 9821da177e4SLinus Torvalds * Request sync writes if 9831da177e4SLinus Torvalds * - the sync export option has been set, or 9841da177e4SLinus Torvalds * - the client requested O_SYNC behavior (NFSv3 feature). 9851da177e4SLinus Torvalds * - The file system doesn't support fsync(). 98648e03bc5STrond Myklebust * When NFSv2 gathered writes have been configured for this volume, 9871da177e4SLinus Torvalds * flushing the data to disk is handled separately below. 9881da177e4SLinus Torvalds */ 98948e03bc5STrond Myklebust use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); 9901da177e4SLinus Torvalds 9913ba15148SHarvey Harrison if (!file->f_op->fsync) {/* COMMIT3 cannot work */ 9921da177e4SLinus Torvalds stable = 2; 9931da177e4SLinus Torvalds *stablep = 2; /* FILE_SYNC */ 9941da177e4SLinus Torvalds } 9951da177e4SLinus Torvalds 9961da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 9971da177e4SLinus Torvalds stable = 0; 99848e03bc5STrond Myklebust if (stable && !use_wgather) { 999db1dd4d3SJonathan Corbet spin_lock(&file->f_lock); 10001da177e4SLinus Torvalds file->f_flags |= O_SYNC; 1001db1dd4d3SJonathan Corbet spin_unlock(&file->f_lock); 1002db1dd4d3SJonathan Corbet } 10031da177e4SLinus Torvalds 10041da177e4SLinus Torvalds /* Write the data. */ 10051da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 10066264d69dSAl Viro host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); 10071da177e4SLinus Torvalds set_fs(oldfs); 1008e4636d53SJ. Bruce Fields if (host_err < 0) 1009e4636d53SJ. Bruce Fields goto out_nfserr; 1010a0d24b29SWei Yongjun *cnt = host_err; 101131dec253SDavid Shaw nfsdstats.io_write += host_err; 10122a12a9d7SEric Paris fsnotify_modify(file); 10131da177e4SLinus Torvalds 10141da177e4SLinus Torvalds /* clear setuid/setgid flag after write */ 1015e4636d53SJ. Bruce Fields if (inode->i_mode & (S_ISUID | S_ISGID)) 10169f708e40SNeil Brown kill_suid(dentry); 10171da177e4SLinus Torvalds 1018e4636d53SJ. Bruce Fields if (stable && use_wgather) 1019d911df7bSJ. Bruce Fields host_err = wait_for_concurrent_writes(file); 10201da177e4SLinus Torvalds 1021e4636d53SJ. Bruce Fields out_nfserr: 10226264d69dSAl Viro dprintk("nfsd: write complete host_err=%d\n", host_err); 1023a0d24b29SWei Yongjun if (host_err >= 0) 10241da177e4SLinus Torvalds err = 0; 1025a0d24b29SWei Yongjun else 10266264d69dSAl Viro err = nfserrno(host_err); 10271da177e4SLinus Torvalds return err; 10281da177e4SLinus Torvalds } 10291da177e4SLinus Torvalds 10301da177e4SLinus Torvalds /* 10311da177e4SLinus Torvalds * Read data from a file. count must contain the requested read count 10321da177e4SLinus Torvalds * on entry. On return, *count contains the number of bytes actually read. 10331da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10341da177e4SLinus Torvalds */ 1035039a87caSJ. Bruce Fields __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, 1036fa0a2126SJ. Bruce Fields loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 1037fa0a2126SJ. Bruce Fields { 1038fa0a2126SJ. Bruce Fields struct file *file; 1039fa0a2126SJ. Bruce Fields struct inode *inode; 1040fa0a2126SJ. Bruce Fields struct raparms *ra; 1041fa0a2126SJ. Bruce Fields __be32 err; 1042fa0a2126SJ. Bruce Fields 1043fa0a2126SJ. Bruce Fields err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 1044fa0a2126SJ. Bruce Fields if (err) 1045fa0a2126SJ. Bruce Fields return err; 1046fa0a2126SJ. Bruce Fields 1047fa0a2126SJ. Bruce Fields inode = file->f_path.dentry->d_inode; 1048fa0a2126SJ. Bruce Fields 1049fa0a2126SJ. Bruce Fields /* Get readahead parameters */ 1050fa0a2126SJ. Bruce Fields ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); 1051fa0a2126SJ. Bruce Fields 1052fa0a2126SJ. Bruce Fields if (ra && ra->p_set) 1053fa0a2126SJ. Bruce Fields file->f_ra = ra->p_ra; 1054fa0a2126SJ. Bruce Fields 1055fa0a2126SJ. Bruce Fields err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 1056fa0a2126SJ. Bruce Fields 1057fa0a2126SJ. Bruce Fields /* Write back readahead params */ 1058fa0a2126SJ. Bruce Fields if (ra) { 1059fa0a2126SJ. Bruce Fields struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; 1060fa0a2126SJ. Bruce Fields spin_lock(&rab->pb_lock); 1061fa0a2126SJ. Bruce Fields ra->p_ra = file->f_ra; 1062fa0a2126SJ. Bruce Fields ra->p_set = 1; 1063fa0a2126SJ. Bruce Fields ra->p_count--; 1064fa0a2126SJ. Bruce Fields spin_unlock(&rab->pb_lock); 1065fa0a2126SJ. Bruce Fields } 1066fa0a2126SJ. Bruce Fields 1067fa0a2126SJ. Bruce Fields nfsd_close(file); 1068fa0a2126SJ. Bruce Fields return err; 1069fa0a2126SJ. Bruce Fields } 1070fa0a2126SJ. Bruce Fields 1071039a87caSJ. Bruce Fields /* As above, but use the provided file descriptor. */ 10726264d69dSAl Viro __be32 1073039a87caSJ. Bruce Fields nfsd_read_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10741da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 10751da177e4SLinus Torvalds unsigned long *count) 10761da177e4SLinus Torvalds { 10776264d69dSAl Viro __be32 err; 10781da177e4SLinus Torvalds 10791da177e4SLinus Torvalds if (file) { 10800ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 10818837abcaSMiklos Szeredi NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); 10821da177e4SLinus Torvalds if (err) 10831da177e4SLinus Torvalds goto out; 10841da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 1085039a87caSJ. Bruce Fields } else /* Note file may still be NULL in NFSv4 special stateid case: */ 1086039a87caSJ. Bruce Fields err = nfsd_read(rqstp, fhp, offset, vec, vlen, count); 10871da177e4SLinus Torvalds out: 10881da177e4SLinus Torvalds return err; 10891da177e4SLinus Torvalds } 10901da177e4SLinus Torvalds 10911da177e4SLinus Torvalds /* 10921da177e4SLinus Torvalds * Write data to a file. 10931da177e4SLinus Torvalds * The stable flag requests synchronous writes. 10941da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10951da177e4SLinus Torvalds */ 10966264d69dSAl Viro __be32 10971da177e4SLinus Torvalds nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 109831dec253SDavid Shaw loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, 10991da177e4SLinus Torvalds int *stablep) 11001da177e4SLinus Torvalds { 11016264d69dSAl Viro __be32 err = 0; 11021da177e4SLinus Torvalds 11031da177e4SLinus Torvalds if (file) { 11040ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 11058837abcaSMiklos Szeredi NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); 11061da177e4SLinus Torvalds if (err) 11071da177e4SLinus Torvalds goto out; 11081da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, 11091da177e4SLinus Torvalds stablep); 11101da177e4SLinus Torvalds } else { 11118837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 11121da177e4SLinus Torvalds if (err) 11131da177e4SLinus Torvalds goto out; 11141da177e4SLinus Torvalds 11151da177e4SLinus Torvalds if (cnt) 11161da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, 11171da177e4SLinus Torvalds cnt, stablep); 11181da177e4SLinus Torvalds nfsd_close(file); 11191da177e4SLinus Torvalds } 11201da177e4SLinus Torvalds out: 11211da177e4SLinus Torvalds return err; 11221da177e4SLinus Torvalds } 11231da177e4SLinus Torvalds 11241da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 11251da177e4SLinus Torvalds /* 11261da177e4SLinus Torvalds * Commit all pending writes to stable storage. 1127aa696a6fSTrond Myklebust * 1128aa696a6fSTrond Myklebust * Note: we only guarantee that data that lies within the range specified 1129aa696a6fSTrond Myklebust * by the 'offset' and 'count' parameters will be synced. 11301da177e4SLinus Torvalds * 11311da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 11321da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 11331da177e4SLinus Torvalds */ 11346264d69dSAl Viro __be32 11351da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 11361da177e4SLinus Torvalds loff_t offset, unsigned long count) 11371da177e4SLinus Torvalds { 11381da177e4SLinus Torvalds struct file *file; 1139aa696a6fSTrond Myklebust loff_t end = LLONG_MAX; 1140aa696a6fSTrond Myklebust __be32 err = nfserr_inval; 11411da177e4SLinus Torvalds 1142aa696a6fSTrond Myklebust if (offset < 0) 1143aa696a6fSTrond Myklebust goto out; 1144aa696a6fSTrond Myklebust if (count != 0) { 1145aa696a6fSTrond Myklebust end = offset + (loff_t)count - 1; 1146aa696a6fSTrond Myklebust if (end < offset) 1147aa696a6fSTrond Myklebust goto out; 1148aa696a6fSTrond Myklebust } 11491da177e4SLinus Torvalds 115091885258SJeff Layton err = nfsd_open(rqstp, fhp, S_IFREG, 115191885258SJeff Layton NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file); 11528837abcaSMiklos Szeredi if (err) 1153aa696a6fSTrond Myklebust goto out; 11541da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 11558018ab05SChristoph Hellwig int err2 = vfs_fsync_range(file, offset, end, 0); 1156aa696a6fSTrond Myklebust 1157aa696a6fSTrond Myklebust if (err2 != -EINVAL) 1158aa696a6fSTrond Myklebust err = nfserrno(err2); 1159aa696a6fSTrond Myklebust else 11601da177e4SLinus Torvalds err = nfserr_notsupp; 11611da177e4SLinus Torvalds } 11621da177e4SLinus Torvalds 11631da177e4SLinus Torvalds nfsd_close(file); 1164aa696a6fSTrond Myklebust out: 11651da177e4SLinus Torvalds return err; 11661da177e4SLinus Torvalds } 11671da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 11681da177e4SLinus Torvalds 1169f2b0dee2SAdrian Bunk static __be32 11705c002b3bSJ. Bruce Fields nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, 11715c002b3bSJ. Bruce Fields struct iattr *iap) 11725c002b3bSJ. Bruce Fields { 11735c002b3bSJ. Bruce Fields /* 11745c002b3bSJ. Bruce Fields * Mode has already been set earlier in create: 11755c002b3bSJ. Bruce Fields */ 11765c002b3bSJ. Bruce Fields iap->ia_valid &= ~ATTR_MODE; 11775c002b3bSJ. Bruce Fields /* 11785c002b3bSJ. Bruce Fields * Setting uid/gid works only for root. Irix appears to 11795c002b3bSJ. Bruce Fields * send along the gid on create when it tries to implement 11805c002b3bSJ. Bruce Fields * setgid directories via NFS: 11815c002b3bSJ. Bruce Fields */ 11825cc0a840SDavid Howells if (current_fsuid() != 0) 11835c002b3bSJ. Bruce Fields iap->ia_valid &= ~(ATTR_UID|ATTR_GID); 11845c002b3bSJ. Bruce Fields if (iap->ia_valid) 11855c002b3bSJ. Bruce Fields return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 11865c002b3bSJ. Bruce Fields return 0; 11875c002b3bSJ. Bruce Fields } 11885c002b3bSJ. Bruce Fields 11894ac35c2fSwengang wang /* HPUX client sometimes creates a file in mode 000, and sets size to 0. 11904ac35c2fSwengang wang * setting size to 0 may fail for some specific file systems by the permission 11914ac35c2fSwengang wang * checking which requires WRITE permission but the mode is 000. 11924ac35c2fSwengang wang * we ignore the resizing(to 0) on the just new created file, since the size is 11934ac35c2fSwengang wang * 0 after file created. 11944ac35c2fSwengang wang * 11954ac35c2fSwengang wang * call this only after vfs_create() is called. 11964ac35c2fSwengang wang * */ 11974ac35c2fSwengang wang static void 11984ac35c2fSwengang wang nfsd_check_ignore_resizing(struct iattr *iap) 11994ac35c2fSwengang wang { 12004ac35c2fSwengang wang if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) 12014ac35c2fSwengang wang iap->ia_valid &= ~ATTR_SIZE; 12024ac35c2fSwengang wang } 12034ac35c2fSwengang wang 12041da177e4SLinus Torvalds /* 12051da177e4SLinus Torvalds * Create a file (regular, directory, device, fifo); UNIX sockets 12061da177e4SLinus Torvalds * not yet implemented. 12071da177e4SLinus Torvalds * If the response fh has been verified, the parent directory should 12081da177e4SLinus Torvalds * already be locked. Note that the parent directory is left locked. 12091da177e4SLinus Torvalds * 12101da177e4SLinus Torvalds * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 12111da177e4SLinus Torvalds */ 12126264d69dSAl Viro __be32 12131da177e4SLinus Torvalds nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 12141da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 12151da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 12161da177e4SLinus Torvalds { 12171da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 12181da177e4SLinus Torvalds struct inode *dirp; 12196264d69dSAl Viro __be32 err; 12205c002b3bSJ. Bruce Fields __be32 err2; 12216264d69dSAl Viro int host_err; 12221da177e4SLinus Torvalds 12231da177e4SLinus Torvalds err = nfserr_perm; 12241da177e4SLinus Torvalds if (!flen) 12251da177e4SLinus Torvalds goto out; 12261da177e4SLinus Torvalds err = nfserr_exist; 12271da177e4SLinus Torvalds if (isdotent(fname, flen)) 12281da177e4SLinus Torvalds goto out; 12291da177e4SLinus Torvalds 12308837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 12311da177e4SLinus Torvalds if (err) 12321da177e4SLinus Torvalds goto out; 12331da177e4SLinus Torvalds 12341da177e4SLinus Torvalds dentry = fhp->fh_dentry; 12351da177e4SLinus Torvalds dirp = dentry->d_inode; 12361da177e4SLinus Torvalds 12371da177e4SLinus Torvalds err = nfserr_notdir; 1238acfa4380SAl Viro if (!dirp->i_op->lookup) 12391da177e4SLinus Torvalds goto out; 12401da177e4SLinus Torvalds /* 12411da177e4SLinus Torvalds * Check whether the response file handle has been verified yet. 12421da177e4SLinus Torvalds * If it has, the parent directory should already be locked. 12431da177e4SLinus Torvalds */ 12441da177e4SLinus Torvalds if (!resfhp->fh_dentry) { 12451da177e4SLinus Torvalds /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ 124612fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 12471da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 12486264d69dSAl Viro host_err = PTR_ERR(dchild); 12491da177e4SLinus Torvalds if (IS_ERR(dchild)) 12501da177e4SLinus Torvalds goto out_nfserr; 12511da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 12521da177e4SLinus Torvalds if (err) 12531da177e4SLinus Torvalds goto out; 12541da177e4SLinus Torvalds } else { 12551da177e4SLinus Torvalds /* called from nfsd_proc_create */ 12561da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 12571da177e4SLinus Torvalds if (!fhp->fh_locked) { 12581da177e4SLinus Torvalds /* not actually possible */ 12591da177e4SLinus Torvalds printk(KERN_ERR 12601da177e4SLinus Torvalds "nfsd_create: parent %s/%s not locked!\n", 12611da177e4SLinus Torvalds dentry->d_parent->d_name.name, 12621da177e4SLinus Torvalds dentry->d_name.name); 1263d75f2b9fSAl Viro err = nfserr_io; 12641da177e4SLinus Torvalds goto out; 12651da177e4SLinus Torvalds } 12661da177e4SLinus Torvalds } 12671da177e4SLinus Torvalds /* 12681da177e4SLinus Torvalds * Make sure the child dentry is still negative ... 12691da177e4SLinus Torvalds */ 12701da177e4SLinus Torvalds err = nfserr_exist; 12711da177e4SLinus Torvalds if (dchild->d_inode) { 12721da177e4SLinus Torvalds dprintk("nfsd_create: dentry %s/%s not negative!\n", 12731da177e4SLinus Torvalds dentry->d_name.name, dchild->d_name.name); 12741da177e4SLinus Torvalds goto out; 12751da177e4SLinus Torvalds } 12761da177e4SLinus Torvalds 12771da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 12781da177e4SLinus Torvalds iap->ia_mode = 0; 12791da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 12801da177e4SLinus Torvalds 128107cad1d2SMiklos Szeredi err = nfserr_inval; 128207cad1d2SMiklos Szeredi if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { 128307cad1d2SMiklos Szeredi printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", 128407cad1d2SMiklos Szeredi type); 128507cad1d2SMiklos Szeredi goto out; 128607cad1d2SMiklos Szeredi } 128707cad1d2SMiklos Szeredi 128807cad1d2SMiklos Szeredi host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 128907cad1d2SMiklos Szeredi if (host_err) 129007cad1d2SMiklos Szeredi goto out_nfserr; 129107cad1d2SMiklos Szeredi 12921da177e4SLinus Torvalds /* 12931da177e4SLinus Torvalds * Get the dir op function pointer. 12941da177e4SLinus Torvalds */ 1295088406bcSJ. Bruce Fields err = 0; 12961da177e4SLinus Torvalds switch (type) { 12971da177e4SLinus Torvalds case S_IFREG: 12986264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 12994ac35c2fSwengang wang if (!host_err) 13004ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 13011da177e4SLinus Torvalds break; 13021da177e4SLinus Torvalds case S_IFDIR: 13036264d69dSAl Viro host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); 13041da177e4SLinus Torvalds break; 13051da177e4SLinus Torvalds case S_IFCHR: 13061da177e4SLinus Torvalds case S_IFBLK: 13071da177e4SLinus Torvalds case S_IFIFO: 13081da177e4SLinus Torvalds case S_IFSOCK: 13096264d69dSAl Viro host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 13101da177e4SLinus Torvalds break; 1311463c3197SDave Hansen } 1312463c3197SDave Hansen if (host_err < 0) { 1313463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1314463c3197SDave Hansen goto out_nfserr; 1315463c3197SDave Hansen } 13161da177e4SLinus Torvalds 1317f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 13181da177e4SLinus Torvalds 1319f501912aSBen Myers /* 1320f501912aSBen Myers * nfsd_setattr already committed the child. Transactional filesystems 1321f501912aSBen Myers * had a chance to commit changes for both parent and child 1322f501912aSBen Myers * simultaneously making the following commit_metadata a noop. 1323f501912aSBen Myers */ 1324f501912aSBen Myers err2 = nfserrno(commit_metadata(fhp)); 1325f193fbabSYAMAMOTO Takashi if (err2) 1326f193fbabSYAMAMOTO Takashi err = err2; 1327463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 13281da177e4SLinus Torvalds /* 13291da177e4SLinus Torvalds * Update the file handle to get the new inode info. 13301da177e4SLinus Torvalds */ 13311da177e4SLinus Torvalds if (!err) 13321da177e4SLinus Torvalds err = fh_update(resfhp); 13331da177e4SLinus Torvalds out: 13341da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 13351da177e4SLinus Torvalds dput(dchild); 13361da177e4SLinus Torvalds return err; 13371da177e4SLinus Torvalds 13381da177e4SLinus Torvalds out_nfserr: 13396264d69dSAl Viro err = nfserrno(host_err); 13401da177e4SLinus Torvalds goto out; 13411da177e4SLinus Torvalds } 13421da177e4SLinus Torvalds 13431da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 13441da177e4SLinus Torvalds /* 13451da177e4SLinus Torvalds * NFSv3 version of nfsd_create 13461da177e4SLinus Torvalds */ 13476264d69dSAl Viro __be32 13481da177e4SLinus Torvalds nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, 13491da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 13501da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 135181ac95c5SJ. Bruce Fields int *truncp, int *created) 13521da177e4SLinus Torvalds { 13531da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 13541da177e4SLinus Torvalds struct inode *dirp; 13556264d69dSAl Viro __be32 err; 13566264d69dSAl Viro int host_err; 13571da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 13581da177e4SLinus Torvalds 13591da177e4SLinus Torvalds err = nfserr_perm; 13601da177e4SLinus Torvalds if (!flen) 13611da177e4SLinus Torvalds goto out; 13621da177e4SLinus Torvalds err = nfserr_exist; 13631da177e4SLinus Torvalds if (isdotent(fname, flen)) 13641da177e4SLinus Torvalds goto out; 13651da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 13661da177e4SLinus Torvalds iap->ia_mode = 0; 13678837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 13681da177e4SLinus Torvalds if (err) 13691da177e4SLinus Torvalds goto out; 13701da177e4SLinus Torvalds 13711da177e4SLinus Torvalds dentry = fhp->fh_dentry; 13721da177e4SLinus Torvalds dirp = dentry->d_inode; 13731da177e4SLinus Torvalds 13741da177e4SLinus Torvalds /* Get all the sanity checks out of the way before 13751da177e4SLinus Torvalds * we lock the parent. */ 13761da177e4SLinus Torvalds err = nfserr_notdir; 1377acfa4380SAl Viro if (!dirp->i_op->lookup) 13781da177e4SLinus Torvalds goto out; 137912fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 13801da177e4SLinus Torvalds 13811da177e4SLinus Torvalds /* 13821da177e4SLinus Torvalds * Compose the response file handle. 13831da177e4SLinus Torvalds */ 13841da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 13856264d69dSAl Viro host_err = PTR_ERR(dchild); 13861da177e4SLinus Torvalds if (IS_ERR(dchild)) 13871da177e4SLinus Torvalds goto out_nfserr; 13881da177e4SLinus Torvalds 13891da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 13901da177e4SLinus Torvalds if (err) 13911da177e4SLinus Torvalds goto out; 13921da177e4SLinus Torvalds 13931da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1394c397852cSPeter Staubach /* solaris7 gets confused (bugid 4218508) if these have 1395749997e5SJeff Layton * the high bit set, so just clear the high bits. If this is 1396749997e5SJeff Layton * ever changed to use different attrs for storing the 1397749997e5SJeff Layton * verifier, then do_open_lookup() will also need to be fixed 1398749997e5SJeff Layton * accordingly. 13991da177e4SLinus Torvalds */ 14001da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 14011da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 14021da177e4SLinus Torvalds } 14031da177e4SLinus Torvalds 1404463c3197SDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 1405463c3197SDave Hansen if (host_err) 1406463c3197SDave Hansen goto out_nfserr; 14071da177e4SLinus Torvalds if (dchild->d_inode) { 14081da177e4SLinus Torvalds err = 0; 14091da177e4SLinus Torvalds 14101da177e4SLinus Torvalds switch (createmode) { 14111da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 14121da177e4SLinus Torvalds if (! S_ISREG(dchild->d_inode->i_mode)) 14131da177e4SLinus Torvalds err = nfserr_exist; 14141da177e4SLinus Torvalds else if (truncp) { 14151da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 14161da177e4SLinus Torvalds * differently. we don't want to truncate the 14171da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 14181da177e4SLinus Torvalds * fails for some other reason. furthermore, 14191da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 14201da177e4SLinus Torvalds * according to spec! 14211da177e4SLinus Torvalds */ 14221da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 14231da177e4SLinus Torvalds } 14241da177e4SLinus Torvalds else { 14251da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 14261da177e4SLinus Torvalds goto set_attr; 14271da177e4SLinus Torvalds } 14281da177e4SLinus Torvalds break; 14291da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 14301da177e4SLinus Torvalds if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 14311da177e4SLinus Torvalds && dchild->d_inode->i_atime.tv_sec == v_atime 14321da177e4SLinus Torvalds && dchild->d_inode->i_size == 0 ) 14331da177e4SLinus Torvalds break; 14341da177e4SLinus Torvalds /* fallthru */ 14351da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 14361da177e4SLinus Torvalds err = nfserr_exist; 14371da177e4SLinus Torvalds } 1438463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14391da177e4SLinus Torvalds goto out; 14401da177e4SLinus Torvalds } 14411da177e4SLinus Torvalds 14426264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 1443463c3197SDave Hansen if (host_err < 0) { 1444463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14451da177e4SLinus Torvalds goto out_nfserr; 1446463c3197SDave Hansen } 144781ac95c5SJ. Bruce Fields if (created) 144881ac95c5SJ. Bruce Fields *created = 1; 14491da177e4SLinus Torvalds 14504ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 14514ac35c2fSwengang wang 14521da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1453c397852cSPeter Staubach /* Cram the verifier into atime/mtime */ 14541da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 1455c397852cSPeter Staubach | ATTR_MTIME_SET|ATTR_ATIME_SET; 14561da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 14571da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 14581da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 14591da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 14601da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 14611da177e4SLinus Torvalds } 14621da177e4SLinus Torvalds 14631da177e4SLinus Torvalds set_attr: 1464f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 1465f501912aSBen Myers 1466f501912aSBen Myers /* 1467f501912aSBen Myers * nfsd_setattr already committed the child (and possibly also the parent). 1468f501912aSBen Myers */ 1469f501912aSBen Myers if (!err) 1470f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 1471f193fbabSYAMAMOTO Takashi 1472463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1473f193fbabSYAMAMOTO Takashi /* 1474f193fbabSYAMAMOTO Takashi * Update the filehandle to get the new inode info. 1475f193fbabSYAMAMOTO Takashi */ 1476f193fbabSYAMAMOTO Takashi if (!err) 1477f193fbabSYAMAMOTO Takashi err = fh_update(resfhp); 14781da177e4SLinus Torvalds 14791da177e4SLinus Torvalds out: 14801da177e4SLinus Torvalds fh_unlock(fhp); 14811da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 14821da177e4SLinus Torvalds dput(dchild); 14831da177e4SLinus Torvalds return err; 14841da177e4SLinus Torvalds 14851da177e4SLinus Torvalds out_nfserr: 14866264d69dSAl Viro err = nfserrno(host_err); 14871da177e4SLinus Torvalds goto out; 14881da177e4SLinus Torvalds } 14891da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 14901da177e4SLinus Torvalds 14911da177e4SLinus Torvalds /* 14921da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 14931da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 14941da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 14951da177e4SLinus Torvalds */ 14966264d69dSAl Viro __be32 14971da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 14981da177e4SLinus Torvalds { 14991da177e4SLinus Torvalds struct dentry *dentry; 15001da177e4SLinus Torvalds struct inode *inode; 15011da177e4SLinus Torvalds mm_segment_t oldfs; 15026264d69dSAl Viro __be32 err; 15036264d69dSAl Viro int host_err; 15041da177e4SLinus Torvalds 15058837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); 15061da177e4SLinus Torvalds if (err) 15071da177e4SLinus Torvalds goto out; 15081da177e4SLinus Torvalds 15091da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15101da177e4SLinus Torvalds inode = dentry->d_inode; 15111da177e4SLinus Torvalds 15121da177e4SLinus Torvalds err = nfserr_inval; 1513acfa4380SAl Viro if (!inode->i_op->readlink) 15141da177e4SLinus Torvalds goto out; 15151da177e4SLinus Torvalds 151654775491SJan Blunck touch_atime(fhp->fh_export->ex_path.mnt, dentry); 15171da177e4SLinus Torvalds /* N.B. Why does this call need a get_fs()?? 15181da177e4SLinus Torvalds * Remove the set_fs and watch the fireworks:-) --okir 15191da177e4SLinus Torvalds */ 15201da177e4SLinus Torvalds 15211da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 15226264d69dSAl Viro host_err = inode->i_op->readlink(dentry, buf, *lenp); 15231da177e4SLinus Torvalds set_fs(oldfs); 15241da177e4SLinus Torvalds 15256264d69dSAl Viro if (host_err < 0) 15261da177e4SLinus Torvalds goto out_nfserr; 15276264d69dSAl Viro *lenp = host_err; 15281da177e4SLinus Torvalds err = 0; 15291da177e4SLinus Torvalds out: 15301da177e4SLinus Torvalds return err; 15311da177e4SLinus Torvalds 15321da177e4SLinus Torvalds out_nfserr: 15336264d69dSAl Viro err = nfserrno(host_err); 15341da177e4SLinus Torvalds goto out; 15351da177e4SLinus Torvalds } 15361da177e4SLinus Torvalds 15371da177e4SLinus Torvalds /* 15381da177e4SLinus Torvalds * Create a symlink and look up its inode 15391da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 15401da177e4SLinus Torvalds */ 15416264d69dSAl Viro __be32 15421da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 15431da177e4SLinus Torvalds char *fname, int flen, 15441da177e4SLinus Torvalds char *path, int plen, 15451da177e4SLinus Torvalds struct svc_fh *resfhp, 15461da177e4SLinus Torvalds struct iattr *iap) 15471da177e4SLinus Torvalds { 15481da177e4SLinus Torvalds struct dentry *dentry, *dnew; 15496264d69dSAl Viro __be32 err, cerr; 15506264d69dSAl Viro int host_err; 15511da177e4SLinus Torvalds 15521da177e4SLinus Torvalds err = nfserr_noent; 15531da177e4SLinus Torvalds if (!flen || !plen) 15541da177e4SLinus Torvalds goto out; 15551da177e4SLinus Torvalds err = nfserr_exist; 15561da177e4SLinus Torvalds if (isdotent(fname, flen)) 15571da177e4SLinus Torvalds goto out; 15581da177e4SLinus Torvalds 15598837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 15601da177e4SLinus Torvalds if (err) 15611da177e4SLinus Torvalds goto out; 15621da177e4SLinus Torvalds fh_lock(fhp); 15631da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15641da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 15656264d69dSAl Viro host_err = PTR_ERR(dnew); 15661da177e4SLinus Torvalds if (IS_ERR(dnew)) 15671da177e4SLinus Torvalds goto out_nfserr; 15681da177e4SLinus Torvalds 156975c3f29dSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 157075c3f29dSDave Hansen if (host_err) 157175c3f29dSDave Hansen goto out_nfserr; 157275c3f29dSDave Hansen 15731da177e4SLinus Torvalds if (unlikely(path[plen] != 0)) { 15741da177e4SLinus Torvalds char *path_alloced = kmalloc(plen+1, GFP_KERNEL); 15751da177e4SLinus Torvalds if (path_alloced == NULL) 15766264d69dSAl Viro host_err = -ENOMEM; 15771da177e4SLinus Torvalds else { 15781da177e4SLinus Torvalds strncpy(path_alloced, path, plen); 15791da177e4SLinus Torvalds path_alloced[plen] = 0; 1580db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); 15811da177e4SLinus Torvalds kfree(path_alloced); 15821da177e4SLinus Torvalds } 15831da177e4SLinus Torvalds } else 1584db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path); 15856264d69dSAl Viro err = nfserrno(host_err); 1586f501912aSBen Myers if (!err) 1587f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 15881da177e4SLinus Torvalds fh_unlock(fhp); 15891da177e4SLinus Torvalds 159075c3f29dSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 159175c3f29dSDave Hansen 15921da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 15931da177e4SLinus Torvalds dput(dnew); 15941da177e4SLinus Torvalds if (err==0) err = cerr; 15951da177e4SLinus Torvalds out: 15961da177e4SLinus Torvalds return err; 15971da177e4SLinus Torvalds 15981da177e4SLinus Torvalds out_nfserr: 15996264d69dSAl Viro err = nfserrno(host_err); 16001da177e4SLinus Torvalds goto out; 16011da177e4SLinus Torvalds } 16021da177e4SLinus Torvalds 16031da177e4SLinus Torvalds /* 16041da177e4SLinus Torvalds * Create a hardlink 16051da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16061da177e4SLinus Torvalds */ 16076264d69dSAl Viro __be32 16081da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 16091da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 16101da177e4SLinus Torvalds { 16111da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 161255b13354SJ. Bruce Fields struct inode *dirp; 16136264d69dSAl Viro __be32 err; 16146264d69dSAl Viro int host_err; 16151da177e4SLinus Torvalds 16168837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); 16171da177e4SLinus Torvalds if (err) 16181da177e4SLinus Torvalds goto out; 16198837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP); 16201da177e4SLinus Torvalds if (err) 16211da177e4SLinus Torvalds goto out; 16221da177e4SLinus Torvalds 16231da177e4SLinus Torvalds err = nfserr_perm; 16241da177e4SLinus Torvalds if (!len) 16251da177e4SLinus Torvalds goto out; 16261da177e4SLinus Torvalds err = nfserr_exist; 16271da177e4SLinus Torvalds if (isdotent(name, len)) 16281da177e4SLinus Torvalds goto out; 16291da177e4SLinus Torvalds 163012fd3520SPeter Zijlstra fh_lock_nested(ffhp, I_MUTEX_PARENT); 16311da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 16321da177e4SLinus Torvalds dirp = ddir->d_inode; 16331da177e4SLinus Torvalds 16341da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 16356264d69dSAl Viro host_err = PTR_ERR(dnew); 16361da177e4SLinus Torvalds if (IS_ERR(dnew)) 16371da177e4SLinus Torvalds goto out_nfserr; 16381da177e4SLinus Torvalds 16391da177e4SLinus Torvalds dold = tfhp->fh_dentry; 16401da177e4SLinus Torvalds 164175c3f29dSDave Hansen host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt); 164275c3f29dSDave Hansen if (host_err) { 164375c3f29dSDave Hansen err = nfserrno(host_err); 164475c3f29dSDave Hansen goto out_dput; 164575c3f29dSDave Hansen } 16466264d69dSAl Viro host_err = vfs_link(dold, dirp, dnew); 16476264d69dSAl Viro if (!host_err) { 1648f501912aSBen Myers err = nfserrno(commit_metadata(ffhp)); 1649f501912aSBen Myers if (!err) 1650f501912aSBen Myers err = nfserrno(commit_metadata(tfhp)); 16511da177e4SLinus Torvalds } else { 16526264d69dSAl Viro if (host_err == -EXDEV && rqstp->rq_vers == 2) 16531da177e4SLinus Torvalds err = nfserr_acces; 16541da177e4SLinus Torvalds else 16556264d69dSAl Viro err = nfserrno(host_err); 16561da177e4SLinus Torvalds } 165775c3f29dSDave Hansen mnt_drop_write(tfhp->fh_export->ex_path.mnt); 165875c3f29dSDave Hansen out_dput: 16591da177e4SLinus Torvalds dput(dnew); 1660270d56e5SDavid M. Richter out_unlock: 1661270d56e5SDavid M. Richter fh_unlock(ffhp); 16621da177e4SLinus Torvalds out: 16631da177e4SLinus Torvalds return err; 16641da177e4SLinus Torvalds 16651da177e4SLinus Torvalds out_nfserr: 16666264d69dSAl Viro err = nfserrno(host_err); 1667270d56e5SDavid M. Richter goto out_unlock; 16681da177e4SLinus Torvalds } 16691da177e4SLinus Torvalds 16701da177e4SLinus Torvalds /* 16711da177e4SLinus Torvalds * Rename a file 16721da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16731da177e4SLinus Torvalds */ 16746264d69dSAl Viro __be32 16751da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 16761da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 16771da177e4SLinus Torvalds { 16781da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 16791da177e4SLinus Torvalds struct inode *fdir, *tdir; 16806264d69dSAl Viro __be32 err; 16816264d69dSAl Viro int host_err; 16821da177e4SLinus Torvalds 16838837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); 16841da177e4SLinus Torvalds if (err) 16851da177e4SLinus Torvalds goto out; 16868837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); 16871da177e4SLinus Torvalds if (err) 16881da177e4SLinus Torvalds goto out; 16891da177e4SLinus Torvalds 16901da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 16911da177e4SLinus Torvalds fdir = fdentry->d_inode; 16921da177e4SLinus Torvalds 16931da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 16941da177e4SLinus Torvalds tdir = tdentry->d_inode; 16951da177e4SLinus Torvalds 16961da177e4SLinus Torvalds err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; 1697a56f3937SNeilBrown if (ffhp->fh_export != tfhp->fh_export) 16981da177e4SLinus Torvalds goto out; 16991da177e4SLinus Torvalds 17001da177e4SLinus Torvalds err = nfserr_perm; 17011da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 17021da177e4SLinus Torvalds goto out; 17031da177e4SLinus Torvalds 17041da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 17051da177e4SLinus Torvalds * so do it by hand */ 17061da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 17071da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 1; 17081da177e4SLinus Torvalds fill_pre_wcc(ffhp); 17091da177e4SLinus Torvalds fill_pre_wcc(tfhp); 17101da177e4SLinus Torvalds 17111da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 17126264d69dSAl Viro host_err = PTR_ERR(odentry); 17131da177e4SLinus Torvalds if (IS_ERR(odentry)) 17141da177e4SLinus Torvalds goto out_nfserr; 17151da177e4SLinus Torvalds 17166264d69dSAl Viro host_err = -ENOENT; 17171da177e4SLinus Torvalds if (!odentry->d_inode) 17181da177e4SLinus Torvalds goto out_dput_old; 17196264d69dSAl Viro host_err = -EINVAL; 17201da177e4SLinus Torvalds if (odentry == trap) 17211da177e4SLinus Torvalds goto out_dput_old; 17221da177e4SLinus Torvalds 17231da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 17246264d69dSAl Viro host_err = PTR_ERR(ndentry); 17251da177e4SLinus Torvalds if (IS_ERR(ndentry)) 17261da177e4SLinus Torvalds goto out_dput_old; 17276264d69dSAl Viro host_err = -ENOTEMPTY; 17281da177e4SLinus Torvalds if (ndentry == trap) 17291da177e4SLinus Torvalds goto out_dput_new; 17301da177e4SLinus Torvalds 17319079b1ebSDave Hansen host_err = -EXDEV; 17329079b1ebSDave Hansen if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) 17339079b1ebSDave Hansen goto out_dput_new; 17349079b1ebSDave Hansen host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt); 17359079b1ebSDave Hansen if (host_err) 17369079b1ebSDave Hansen goto out_dput_new; 17379079b1ebSDave Hansen 17386264d69dSAl Viro host_err = vfs_rename(fdir, odentry, tdir, ndentry); 1739f501912aSBen Myers if (!host_err) { 1740f501912aSBen Myers host_err = commit_metadata(tfhp); 17416264d69dSAl Viro if (!host_err) 1742f501912aSBen Myers host_err = commit_metadata(ffhp); 17431da177e4SLinus Torvalds } 17441da177e4SLinus Torvalds 17459079b1ebSDave Hansen mnt_drop_write(ffhp->fh_export->ex_path.mnt); 17469079b1ebSDave Hansen 17471da177e4SLinus Torvalds out_dput_new: 17481da177e4SLinus Torvalds dput(ndentry); 17491da177e4SLinus Torvalds out_dput_old: 17501da177e4SLinus Torvalds dput(odentry); 17511da177e4SLinus Torvalds out_nfserr: 17526264d69dSAl Viro err = nfserrno(host_err); 17531da177e4SLinus Torvalds 17541da177e4SLinus Torvalds /* we cannot reply on fh_unlock on the two filehandles, 17551da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 17561da177e4SLinus Torvalds * were the same, so again we do it by hand 17571da177e4SLinus Torvalds */ 17581da177e4SLinus Torvalds fill_post_wcc(ffhp); 17591da177e4SLinus Torvalds fill_post_wcc(tfhp); 17601da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 17611da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 0; 17621da177e4SLinus Torvalds 17631da177e4SLinus Torvalds out: 17641da177e4SLinus Torvalds return err; 17651da177e4SLinus Torvalds } 17661da177e4SLinus Torvalds 17671da177e4SLinus Torvalds /* 17681da177e4SLinus Torvalds * Unlink a file or directory 17691da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 17701da177e4SLinus Torvalds */ 17716264d69dSAl Viro __be32 17721da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 17731da177e4SLinus Torvalds char *fname, int flen) 17741da177e4SLinus Torvalds { 17751da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 17761da177e4SLinus Torvalds struct inode *dirp; 17776264d69dSAl Viro __be32 err; 17786264d69dSAl Viro int host_err; 17791da177e4SLinus Torvalds 17801da177e4SLinus Torvalds err = nfserr_acces; 17811da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 17821da177e4SLinus Torvalds goto out; 17838837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); 17841da177e4SLinus Torvalds if (err) 17851da177e4SLinus Torvalds goto out; 17861da177e4SLinus Torvalds 178712fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 17881da177e4SLinus Torvalds dentry = fhp->fh_dentry; 17891da177e4SLinus Torvalds dirp = dentry->d_inode; 17901da177e4SLinus Torvalds 17911da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 17926264d69dSAl Viro host_err = PTR_ERR(rdentry); 17931da177e4SLinus Torvalds if (IS_ERR(rdentry)) 17941da177e4SLinus Torvalds goto out_nfserr; 17951da177e4SLinus Torvalds 17961da177e4SLinus Torvalds if (!rdentry->d_inode) { 17971da177e4SLinus Torvalds dput(rdentry); 17981da177e4SLinus Torvalds err = nfserr_noent; 17991da177e4SLinus Torvalds goto out; 18001da177e4SLinus Torvalds } 18011da177e4SLinus Torvalds 18021da177e4SLinus Torvalds if (!type) 18031da177e4SLinus Torvalds type = rdentry->d_inode->i_mode & S_IFMT; 18041da177e4SLinus Torvalds 18050622753bSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 18060622753bSDave Hansen if (host_err) 18070622753bSDave Hansen goto out_nfserr; 18080622753bSDave Hansen 1809*9ce137eeSJ. Bruce Fields if (type != S_IFDIR) 18106264d69dSAl Viro host_err = vfs_unlink(dirp, rdentry); 1811*9ce137eeSJ. Bruce Fields else 18126264d69dSAl Viro host_err = vfs_rmdir(dirp, rdentry); 18131da177e4SLinus Torvalds 18141da177e4SLinus Torvalds dput(rdentry); 18151da177e4SLinus Torvalds 1816f501912aSBen Myers if (!host_err) 1817f501912aSBen Myers host_err = commit_metadata(fhp); 18181da177e4SLinus Torvalds 18190622753bSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 18201da177e4SLinus Torvalds out_nfserr: 18216264d69dSAl Viro err = nfserrno(host_err); 1822f193fbabSYAMAMOTO Takashi out: 1823f193fbabSYAMAMOTO Takashi return err; 18241da177e4SLinus Torvalds } 18251da177e4SLinus Torvalds 18261da177e4SLinus Torvalds /* 182714f7dd63SDavid Woodhouse * We do this buffering because we must not call back into the file 182814f7dd63SDavid Woodhouse * system's ->lookup() method from the filldir callback. That may well 182914f7dd63SDavid Woodhouse * deadlock a number of file systems. 183014f7dd63SDavid Woodhouse * 183114f7dd63SDavid Woodhouse * This is based heavily on the implementation of same in XFS. 183214f7dd63SDavid Woodhouse */ 183314f7dd63SDavid Woodhouse struct buffered_dirent { 183414f7dd63SDavid Woodhouse u64 ino; 183514f7dd63SDavid Woodhouse loff_t offset; 183614f7dd63SDavid Woodhouse int namlen; 183714f7dd63SDavid Woodhouse unsigned int d_type; 183814f7dd63SDavid Woodhouse char name[]; 183914f7dd63SDavid Woodhouse }; 184014f7dd63SDavid Woodhouse 184114f7dd63SDavid Woodhouse struct readdir_data { 184214f7dd63SDavid Woodhouse char *dirent; 184314f7dd63SDavid Woodhouse size_t used; 184453c9c5c0SAl Viro int full; 184514f7dd63SDavid Woodhouse }; 184614f7dd63SDavid Woodhouse 184714f7dd63SDavid Woodhouse static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, 184814f7dd63SDavid Woodhouse loff_t offset, u64 ino, unsigned int d_type) 184914f7dd63SDavid Woodhouse { 185014f7dd63SDavid Woodhouse struct readdir_data *buf = __buf; 185114f7dd63SDavid Woodhouse struct buffered_dirent *de = (void *)(buf->dirent + buf->used); 185214f7dd63SDavid Woodhouse unsigned int reclen; 185314f7dd63SDavid Woodhouse 185414f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); 185553c9c5c0SAl Viro if (buf->used + reclen > PAGE_SIZE) { 185653c9c5c0SAl Viro buf->full = 1; 185714f7dd63SDavid Woodhouse return -EINVAL; 185853c9c5c0SAl Viro } 185914f7dd63SDavid Woodhouse 186014f7dd63SDavid Woodhouse de->namlen = namlen; 186114f7dd63SDavid Woodhouse de->offset = offset; 186214f7dd63SDavid Woodhouse de->ino = ino; 186314f7dd63SDavid Woodhouse de->d_type = d_type; 186414f7dd63SDavid Woodhouse memcpy(de->name, name, namlen); 186514f7dd63SDavid Woodhouse buf->used += reclen; 186614f7dd63SDavid Woodhouse 186714f7dd63SDavid Woodhouse return 0; 186814f7dd63SDavid Woodhouse } 186914f7dd63SDavid Woodhouse 18702f9092e1SDavid Woodhouse static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func, 18712628b766SDavid Woodhouse struct readdir_cd *cdp, loff_t *offsetp) 18722628b766SDavid Woodhouse { 187314f7dd63SDavid Woodhouse struct readdir_data buf; 187414f7dd63SDavid Woodhouse struct buffered_dirent *de; 18752628b766SDavid Woodhouse int host_err; 187614f7dd63SDavid Woodhouse int size; 187714f7dd63SDavid Woodhouse loff_t offset; 18782628b766SDavid Woodhouse 187914f7dd63SDavid Woodhouse buf.dirent = (void *)__get_free_page(GFP_KERNEL); 188014f7dd63SDavid Woodhouse if (!buf.dirent) 18812f9092e1SDavid Woodhouse return nfserrno(-ENOMEM); 188214f7dd63SDavid Woodhouse 188314f7dd63SDavid Woodhouse offset = *offsetp; 18842628b766SDavid Woodhouse 188514f7dd63SDavid Woodhouse while (1) { 18862f9092e1SDavid Woodhouse struct inode *dir_inode = file->f_path.dentry->d_inode; 188714f7dd63SDavid Woodhouse unsigned int reclen; 188814f7dd63SDavid Woodhouse 1889b726e923SDoug Nazar cdp->err = nfserr_eof; /* will be cleared on successful read */ 189014f7dd63SDavid Woodhouse buf.used = 0; 189153c9c5c0SAl Viro buf.full = 0; 189214f7dd63SDavid Woodhouse 189314f7dd63SDavid Woodhouse host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf); 189453c9c5c0SAl Viro if (buf.full) 189553c9c5c0SAl Viro host_err = 0; 189653c9c5c0SAl Viro 189753c9c5c0SAl Viro if (host_err < 0) 189814f7dd63SDavid Woodhouse break; 189914f7dd63SDavid Woodhouse 190014f7dd63SDavid Woodhouse size = buf.used; 190114f7dd63SDavid Woodhouse 190214f7dd63SDavid Woodhouse if (!size) 190314f7dd63SDavid Woodhouse break; 190414f7dd63SDavid Woodhouse 19052f9092e1SDavid Woodhouse /* 19062f9092e1SDavid Woodhouse * Various filldir functions may end up calling back into 19072f9092e1SDavid Woodhouse * lookup_one_len() and the file system's ->lookup() method. 19082f9092e1SDavid Woodhouse * These expect i_mutex to be held, as it would within readdir. 19092f9092e1SDavid Woodhouse */ 19102f9092e1SDavid Woodhouse host_err = mutex_lock_killable(&dir_inode->i_mutex); 19112f9092e1SDavid Woodhouse if (host_err) 19122f9092e1SDavid Woodhouse break; 19132f9092e1SDavid Woodhouse 191414f7dd63SDavid Woodhouse de = (struct buffered_dirent *)buf.dirent; 191514f7dd63SDavid Woodhouse while (size > 0) { 191614f7dd63SDavid Woodhouse offset = de->offset; 191714f7dd63SDavid Woodhouse 191814f7dd63SDavid Woodhouse if (func(cdp, de->name, de->namlen, de->offset, 191914f7dd63SDavid Woodhouse de->ino, de->d_type)) 19202f9092e1SDavid Woodhouse break; 192114f7dd63SDavid Woodhouse 192214f7dd63SDavid Woodhouse if (cdp->err != nfs_ok) 19232f9092e1SDavid Woodhouse break; 192414f7dd63SDavid Woodhouse 192514f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(*de) + de->namlen, 192614f7dd63SDavid Woodhouse sizeof(u64)); 192714f7dd63SDavid Woodhouse size -= reclen; 192814f7dd63SDavid Woodhouse de = (struct buffered_dirent *)((char *)de + reclen); 192914f7dd63SDavid Woodhouse } 19302f9092e1SDavid Woodhouse mutex_unlock(&dir_inode->i_mutex); 19312f9092e1SDavid Woodhouse if (size > 0) /* We bailed out early */ 19322f9092e1SDavid Woodhouse break; 19332f9092e1SDavid Woodhouse 1934c002a6c7SDavid Woodhouse offset = vfs_llseek(file, 0, SEEK_CUR); 193514f7dd63SDavid Woodhouse } 193614f7dd63SDavid Woodhouse 193714f7dd63SDavid Woodhouse free_page((unsigned long)(buf.dirent)); 19382628b766SDavid Woodhouse 19392628b766SDavid Woodhouse if (host_err) 19402628b766SDavid Woodhouse return nfserrno(host_err); 194114f7dd63SDavid Woodhouse 194214f7dd63SDavid Woodhouse *offsetp = offset; 19432628b766SDavid Woodhouse return cdp->err; 19442628b766SDavid Woodhouse } 19452628b766SDavid Woodhouse 19461da177e4SLinus Torvalds /* 19471da177e4SLinus Torvalds * Read entries from a directory. 19481da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 19491da177e4SLinus Torvalds */ 19506264d69dSAl Viro __be32 19511da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 1952a0ad13efSNeilBrown struct readdir_cd *cdp, filldir_t func) 19531da177e4SLinus Torvalds { 19546264d69dSAl Viro __be32 err; 19551da177e4SLinus Torvalds struct file *file; 19561da177e4SLinus Torvalds loff_t offset = *offsetp; 19571da177e4SLinus Torvalds 19588837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file); 19591da177e4SLinus Torvalds if (err) 19601da177e4SLinus Torvalds goto out; 19611da177e4SLinus Torvalds 19621da177e4SLinus Torvalds offset = vfs_llseek(file, offset, 0); 19631da177e4SLinus Torvalds if (offset < 0) { 19641da177e4SLinus Torvalds err = nfserrno((int)offset); 19651da177e4SLinus Torvalds goto out_close; 19661da177e4SLinus Torvalds } 19671da177e4SLinus Torvalds 196814f7dd63SDavid Woodhouse err = nfsd_buffered_readdir(file, func, cdp, offsetp); 19691da177e4SLinus Torvalds 19701da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 19711da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 19721da177e4SLinus Torvalds out_close: 19731da177e4SLinus Torvalds nfsd_close(file); 19741da177e4SLinus Torvalds out: 19751da177e4SLinus Torvalds return err; 19761da177e4SLinus Torvalds } 19771da177e4SLinus Torvalds 19781da177e4SLinus Torvalds /* 19791da177e4SLinus Torvalds * Get file system stats 19801da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 19811da177e4SLinus Torvalds */ 19826264d69dSAl Viro __be32 198304716e66SJ. Bruce Fields nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) 19841da177e4SLinus Torvalds { 1985f6360efbSTakashi Iwai __be32 err; 1986f6360efbSTakashi Iwai 1987f6360efbSTakashi Iwai err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); 1988f6360efbSTakashi Iwai if (!err) { 1989ebabe9a9SChristoph Hellwig struct path path = { 1990ebabe9a9SChristoph Hellwig .mnt = fhp->fh_export->ex_path.mnt, 1991ebabe9a9SChristoph Hellwig .dentry = fhp->fh_dentry, 1992ebabe9a9SChristoph Hellwig }; 1993f6360efbSTakashi Iwai if (vfs_statfs(&path, stat)) 19941da177e4SLinus Torvalds err = nfserr_io; 1995f6360efbSTakashi Iwai } 19961da177e4SLinus Torvalds return err; 19971da177e4SLinus Torvalds } 19981da177e4SLinus Torvalds 1999c7d51402SJ. Bruce Fields static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) 2000e22841c6SJ. Bruce Fields { 2001c7d51402SJ. Bruce Fields return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; 2002e22841c6SJ. Bruce Fields } 2003e22841c6SJ. Bruce Fields 20041da177e4SLinus Torvalds /* 20051da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 20061da177e4SLinus Torvalds */ 20076264d69dSAl Viro __be32 20080ec757dfSJ. Bruce Fields nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, 20090ec757dfSJ. Bruce Fields struct dentry *dentry, int acc) 20101da177e4SLinus Torvalds { 20111da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 20121da177e4SLinus Torvalds int err; 20131da177e4SLinus Torvalds 20148837abcaSMiklos Szeredi if (acc == NFSD_MAY_NOP) 20151da177e4SLinus Torvalds return 0; 20161da177e4SLinus Torvalds #if 0 20171da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 20181da177e4SLinus Torvalds acc, 20198837abcaSMiklos Szeredi (acc & NFSD_MAY_READ)? " read" : "", 20208837abcaSMiklos Szeredi (acc & NFSD_MAY_WRITE)? " write" : "", 20218837abcaSMiklos Szeredi (acc & NFSD_MAY_EXEC)? " exec" : "", 20228837abcaSMiklos Szeredi (acc & NFSD_MAY_SATTR)? " sattr" : "", 20238837abcaSMiklos Szeredi (acc & NFSD_MAY_TRUNC)? " trunc" : "", 20248837abcaSMiklos Szeredi (acc & NFSD_MAY_LOCK)? " lock" : "", 20258837abcaSMiklos Szeredi (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", 20261da177e4SLinus Torvalds inode->i_mode, 20271da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 20281da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 20292c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); 20301da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 20315cc0a840SDavid Howells inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); 20321da177e4SLinus Torvalds #endif 20331da177e4SLinus Torvalds 20341da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 20351da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 20361da177e4SLinus Torvalds * device special file, we ignore rofs. 20371da177e4SLinus Torvalds */ 20388837abcaSMiklos Szeredi if (!(acc & NFSD_MAY_LOCAL_ACCESS)) 20398837abcaSMiklos Szeredi if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { 20402c463e95SDave Hansen if (exp_rdonly(rqstp, exp) || 20412c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)) 20421da177e4SLinus Torvalds return nfserr_rofs; 20438837abcaSMiklos Szeredi if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) 20441da177e4SLinus Torvalds return nfserr_perm; 20451da177e4SLinus Torvalds } 20468837abcaSMiklos Szeredi if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) 20471da177e4SLinus Torvalds return nfserr_perm; 20481da177e4SLinus Torvalds 20498837abcaSMiklos Szeredi if (acc & NFSD_MAY_LOCK) { 20501da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 20511da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 20521da177e4SLinus Torvalds * ownership 20531da177e4SLinus Torvalds */ 20541da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 20551da177e4SLinus Torvalds return 0; 20561da177e4SLinus Torvalds else 20578837abcaSMiklos Szeredi acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; 20581da177e4SLinus Torvalds } 20591da177e4SLinus Torvalds /* 20601da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 20611da177e4SLinus Torvalds * would normally be checked at open time. This is to make 20621da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 20631da177e4SLinus Torvalds * 20641da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 20651da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 20661da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 20671da177e4SLinus Torvalds * always implies file truncation. 20681da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 20691da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 20701da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 20711da177e4SLinus Torvalds * with NFSv3. 20721da177e4SLinus Torvalds */ 20738837abcaSMiklos Szeredi if ((acc & NFSD_MAY_OWNER_OVERRIDE) && 20745cc0a840SDavid Howells inode->i_uid == current_fsuid()) 20751da177e4SLinus Torvalds return 0; 20761da177e4SLinus Torvalds 20778837abcaSMiklos Szeredi /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ 2078f419a2e3SAl Viro err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); 20791da177e4SLinus Torvalds 20801da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 20811da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 20828837abcaSMiklos Szeredi acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE)) 2083f419a2e3SAl Viro err = inode_permission(inode, MAY_EXEC); 20841da177e4SLinus Torvalds 20851da177e4SLinus Torvalds return err? nfserrno(err) : 0; 20861da177e4SLinus Torvalds } 20871da177e4SLinus Torvalds 20881da177e4SLinus Torvalds void 20891da177e4SLinus Torvalds nfsd_racache_shutdown(void) 20901da177e4SLinus Torvalds { 209154a66e54SJeff Layton struct raparms *raparm, *last_raparm; 209254a66e54SJeff Layton unsigned int i; 209354a66e54SJeff Layton 20941da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 209554a66e54SJeff Layton 209654a66e54SJeff Layton for (i = 0; i < RAPARM_HASH_SIZE; i++) { 209754a66e54SJeff Layton raparm = raparm_hash[i].pb_head; 209854a66e54SJeff Layton while(raparm) { 209954a66e54SJeff Layton last_raparm = raparm; 210054a66e54SJeff Layton raparm = raparm->p_next; 210154a66e54SJeff Layton kfree(last_raparm); 210254a66e54SJeff Layton } 210354a66e54SJeff Layton raparm_hash[i].pb_head = NULL; 210454a66e54SJeff Layton } 21051da177e4SLinus Torvalds } 21061da177e4SLinus Torvalds /* 21071da177e4SLinus Torvalds * Initialize readahead param cache 21081da177e4SLinus Torvalds */ 21091da177e4SLinus Torvalds int 21101da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 21111da177e4SLinus Torvalds { 21121da177e4SLinus Torvalds int i; 2113fce1456aSGreg Banks int j = 0; 2114fce1456aSGreg Banks int nperbucket; 211554a66e54SJeff Layton struct raparms **raparm = NULL; 21161da177e4SLinus Torvalds 2117fce1456aSGreg Banks 211854a66e54SJeff Layton if (raparm_hash[0].pb_head) 21191da177e4SLinus Torvalds return 0; 212054a66e54SJeff Layton nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); 212154a66e54SJeff Layton if (nperbucket < 2) 212254a66e54SJeff Layton nperbucket = 2; 212354a66e54SJeff Layton cache_size = nperbucket * RAPARM_HASH_SIZE; 21244b3bb06bSYan Burman 21254b3bb06bSYan Burman dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); 212654a66e54SJeff Layton 2127fce1456aSGreg Banks for (i = 0; i < RAPARM_HASH_SIZE; i++) { 2128fce1456aSGreg Banks spin_lock_init(&raparm_hash[i].pb_lock); 212954a66e54SJeff Layton 213054a66e54SJeff Layton raparm = &raparm_hash[i].pb_head; 213154a66e54SJeff Layton for (j = 0; j < nperbucket; j++) { 213254a66e54SJeff Layton *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); 213354a66e54SJeff Layton if (!*raparm) 213454a66e54SJeff Layton goto out_nomem; 213554a66e54SJeff Layton raparm = &(*raparm)->p_next; 2136fce1456aSGreg Banks } 213754a66e54SJeff Layton *raparm = NULL; 21381da177e4SLinus Torvalds } 21394b3bb06bSYan Burman 21401da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 21411da177e4SLinus Torvalds return 0; 214254a66e54SJeff Layton 214354a66e54SJeff Layton out_nomem: 214454a66e54SJeff Layton dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); 214554a66e54SJeff Layton nfsd_racache_shutdown(); 214654a66e54SJeff Layton return -ENOMEM; 21471da177e4SLinus Torvalds } 2148a257cdd0SAndreas Gruenbacher 2149a257cdd0SAndreas Gruenbacher #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 2150a257cdd0SAndreas Gruenbacher struct posix_acl * 2151a257cdd0SAndreas Gruenbacher nfsd_get_posix_acl(struct svc_fh *fhp, int type) 2152a257cdd0SAndreas Gruenbacher { 2153a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2154a257cdd0SAndreas Gruenbacher char *name; 2155a257cdd0SAndreas Gruenbacher void *value = NULL; 2156a257cdd0SAndreas Gruenbacher ssize_t size; 2157a257cdd0SAndreas Gruenbacher struct posix_acl *acl; 2158a257cdd0SAndreas Gruenbacher 21595be196e5SChristoph Hellwig if (!IS_POSIXACL(inode)) 2160a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 21615be196e5SChristoph Hellwig 2162a257cdd0SAndreas Gruenbacher switch (type) { 2163a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2164334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2165a257cdd0SAndreas Gruenbacher break; 2166a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2167334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2168a257cdd0SAndreas Gruenbacher break; 2169a257cdd0SAndreas Gruenbacher default: 2170a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 2171a257cdd0SAndreas Gruenbacher } 2172a257cdd0SAndreas Gruenbacher 21735be196e5SChristoph Hellwig size = nfsd_getxattr(fhp->fh_dentry, name, &value); 21745be196e5SChristoph Hellwig if (size < 0) 21755be196e5SChristoph Hellwig return ERR_PTR(size); 2176a257cdd0SAndreas Gruenbacher 2177a257cdd0SAndreas Gruenbacher acl = posix_acl_from_xattr(value, size); 2178a257cdd0SAndreas Gruenbacher kfree(value); 2179a257cdd0SAndreas Gruenbacher return acl; 2180a257cdd0SAndreas Gruenbacher } 2181a257cdd0SAndreas Gruenbacher 2182a257cdd0SAndreas Gruenbacher int 2183a257cdd0SAndreas Gruenbacher nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) 2184a257cdd0SAndreas Gruenbacher { 2185a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2186a257cdd0SAndreas Gruenbacher char *name; 2187a257cdd0SAndreas Gruenbacher void *value = NULL; 2188a257cdd0SAndreas Gruenbacher size_t size; 2189a257cdd0SAndreas Gruenbacher int error; 2190a257cdd0SAndreas Gruenbacher 2191acfa4380SAl Viro if (!IS_POSIXACL(inode) || 2192a257cdd0SAndreas Gruenbacher !inode->i_op->setxattr || !inode->i_op->removexattr) 2193a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2194a257cdd0SAndreas Gruenbacher switch(type) { 2195a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2196334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2197a257cdd0SAndreas Gruenbacher break; 2198a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2199334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2200a257cdd0SAndreas Gruenbacher break; 2201a257cdd0SAndreas Gruenbacher default: 2202a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2203a257cdd0SAndreas Gruenbacher } 2204a257cdd0SAndreas Gruenbacher 2205a257cdd0SAndreas Gruenbacher if (acl && acl->a_count) { 2206334a13ecSChristoph Hellwig size = posix_acl_xattr_size(acl->a_count); 2207a257cdd0SAndreas Gruenbacher value = kmalloc(size, GFP_KERNEL); 2208a257cdd0SAndreas Gruenbacher if (!value) 2209a257cdd0SAndreas Gruenbacher return -ENOMEM; 22109ccfc29cSFlorin Malita error = posix_acl_to_xattr(acl, value, size); 22119ccfc29cSFlorin Malita if (error < 0) 2212a257cdd0SAndreas Gruenbacher goto getout; 22139ccfc29cSFlorin Malita size = error; 2214a257cdd0SAndreas Gruenbacher } else 2215a257cdd0SAndreas Gruenbacher size = 0; 2216a257cdd0SAndreas Gruenbacher 221718f335afSDave Hansen error = mnt_want_write(fhp->fh_export->ex_path.mnt); 221818f335afSDave Hansen if (error) 221918f335afSDave Hansen goto getout; 2220a257cdd0SAndreas Gruenbacher if (size) 22215be196e5SChristoph Hellwig error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); 2222a257cdd0SAndreas Gruenbacher else { 2223a257cdd0SAndreas Gruenbacher if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) 2224a257cdd0SAndreas Gruenbacher error = 0; 2225a257cdd0SAndreas Gruenbacher else { 22265be196e5SChristoph Hellwig error = vfs_removexattr(fhp->fh_dentry, name); 2227a257cdd0SAndreas Gruenbacher if (error == -ENODATA) 2228a257cdd0SAndreas Gruenbacher error = 0; 2229a257cdd0SAndreas Gruenbacher } 2230a257cdd0SAndreas Gruenbacher } 223118f335afSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 2232a257cdd0SAndreas Gruenbacher 2233a257cdd0SAndreas Gruenbacher getout: 2234a257cdd0SAndreas Gruenbacher kfree(value); 2235a257cdd0SAndreas Gruenbacher return error; 2236a257cdd0SAndreas Gruenbacher } 2237a257cdd0SAndreas Gruenbacher #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ 2238