11da177e4SLinus Torvalds #define MSNFS /* HACK HACK */ 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * File operations used by nfsd. Some of these have been ripped from 41da177e4SLinus Torvalds * other parts of the kernel because they weren't exported, others 51da177e4SLinus Torvalds * are partial duplicates with added or changed functionality. 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * Note that several functions dget() the dentry upon which they want 81da177e4SLinus Torvalds * to act, most notably those that create directory entries. Response 91da177e4SLinus Torvalds * dentry's are dput()'d if necessary in the release callback. 101da177e4SLinus Torvalds * So if you notice code paths that apparently fail to dput() the 111da177e4SLinus Torvalds * dentry, don't worry--they have been taken care of. 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> 141da177e4SLinus Torvalds * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> 151da177e4SLinus Torvalds */ 161da177e4SLinus Torvalds 171da177e4SLinus Torvalds #include <linux/fs.h> 181da177e4SLinus Torvalds #include <linux/file.h> 19d6b29d7cSJens Axboe #include <linux/splice.h> 201da177e4SLinus Torvalds #include <linux/fcntl.h> 211da177e4SLinus Torvalds #include <linux/namei.h> 221da177e4SLinus Torvalds #include <linux/delay.h> 231da177e4SLinus Torvalds #include <linux/quotaops.h> 240eeca283SRobert Love #include <linux/fsnotify.h> 251da177e4SLinus Torvalds #include <linux/posix_acl_xattr.h> 261da177e4SLinus Torvalds #include <linux/xattr.h> 279a74af21SBoaz Harrosh #include <linux/jhash.h> 289a74af21SBoaz Harrosh #include <linux/ima.h> 299a74af21SBoaz Harrosh #include <asm/uaccess.h> 309a74af21SBoaz Harrosh 319a74af21SBoaz Harrosh #ifdef CONFIG_NFSD_V3 329a74af21SBoaz Harrosh #include "xdr3.h" 339a74af21SBoaz Harrosh #endif /* CONFIG_NFSD_V3 */ 349a74af21SBoaz Harrosh 355be196e5SChristoph Hellwig #ifdef CONFIG_NFSD_V4 361da177e4SLinus Torvalds #include <linux/nfs4_acl.h> 371da177e4SLinus Torvalds #include <linux/nfsd_idmap.h> 381da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V4 */ 391da177e4SLinus Torvalds 409a74af21SBoaz Harrosh #include "nfsd.h" 419a74af21SBoaz Harrosh #include "vfs.h" 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds #define NFSDDBG_FACILITY NFSDDBG_FILEOP 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds /* 471da177e4SLinus Torvalds * This is a cache of readahead params that help us choose the proper 481da177e4SLinus Torvalds * readahead strategy. Initially, we set all readahead parameters to 0 491da177e4SLinus Torvalds * and let the VFS handle things. 501da177e4SLinus Torvalds * If you increase the number of cached files very much, you'll need to 511da177e4SLinus Torvalds * add a hash table here. 521da177e4SLinus Torvalds */ 531da177e4SLinus Torvalds struct raparms { 541da177e4SLinus Torvalds struct raparms *p_next; 551da177e4SLinus Torvalds unsigned int p_count; 561da177e4SLinus Torvalds ino_t p_ino; 571da177e4SLinus Torvalds dev_t p_dev; 581da177e4SLinus Torvalds int p_set; 591da177e4SLinus Torvalds struct file_ra_state p_ra; 60fce1456aSGreg Banks unsigned int p_hindex; 611da177e4SLinus Torvalds }; 621da177e4SLinus Torvalds 63fce1456aSGreg Banks struct raparm_hbucket { 64fce1456aSGreg Banks struct raparms *pb_head; 65fce1456aSGreg Banks spinlock_t pb_lock; 66fce1456aSGreg Banks } ____cacheline_aligned_in_smp; 67fce1456aSGreg Banks 68fce1456aSGreg Banks #define RAPARM_HASH_BITS 4 69fce1456aSGreg Banks #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) 70fce1456aSGreg Banks #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) 71fce1456aSGreg Banks static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds /* 741da177e4SLinus Torvalds * Called from nfsd_lookup and encode_dirent. Check if we have crossed 751da177e4SLinus Torvalds * a mount point. 76e0bb89efSJ.Bruce Fields * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, 771da177e4SLinus Torvalds * or nfs_ok having possibly changed *dpp and *expp 781da177e4SLinus Torvalds */ 791da177e4SLinus Torvalds int 801da177e4SLinus Torvalds nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 811da177e4SLinus Torvalds struct svc_export **expp) 821da177e4SLinus Torvalds { 831da177e4SLinus Torvalds struct svc_export *exp = *expp, *exp2 = NULL; 841da177e4SLinus Torvalds struct dentry *dentry = *dpp; 8591c9fa8fSAl Viro struct path path = {.mnt = mntget(exp->ex_path.mnt), 8691c9fa8fSAl Viro .dentry = dget(dentry)}; 876264d69dSAl Viro int err = 0; 881da177e4SLinus Torvalds 899393bd07SAl Viro while (d_mountpoint(path.dentry) && follow_down(&path)) 9091c9fa8fSAl Viro ; 911da177e4SLinus Torvalds 9291c9fa8fSAl Viro exp2 = rqst_exp_get_by_name(rqstp, &path); 931da177e4SLinus Torvalds if (IS_ERR(exp2)) { 941da177e4SLinus Torvalds err = PTR_ERR(exp2); 953b6cee7bSJ. Bruce Fields /* 963b6cee7bSJ. Bruce Fields * We normally allow NFS clients to continue 973b6cee7bSJ. Bruce Fields * "underneath" a mountpoint that is not exported. 983b6cee7bSJ. Bruce Fields * The exception is V4ROOT, where no traversal is ever 993b6cee7bSJ. Bruce Fields * allowed without an explicit export of the new 1003b6cee7bSJ. Bruce Fields * directory. 1013b6cee7bSJ. Bruce Fields */ 1023b6cee7bSJ. Bruce Fields if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) 1033b6cee7bSJ. Bruce Fields err = 0; 10491c9fa8fSAl Viro path_put(&path); 1051da177e4SLinus Torvalds goto out; 1061da177e4SLinus Torvalds } 1073c394ddaSSteve Dickson if (nfsd_v4client(rqstp) || 1083c394ddaSSteve Dickson (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { 1091da177e4SLinus Torvalds /* successfully crossed mount point */ 1101644ccc8SAl Viro /* 11191c9fa8fSAl Viro * This is subtle: path.dentry is *not* on path.mnt 11291c9fa8fSAl Viro * at this point. The only reason we are safe is that 11391c9fa8fSAl Viro * original mnt is pinned down by exp, so we should 11491c9fa8fSAl Viro * put path *before* putting exp 1151644ccc8SAl Viro */ 11691c9fa8fSAl Viro *dpp = path.dentry; 11791c9fa8fSAl Viro path.dentry = dentry; 1181644ccc8SAl Viro *expp = exp2; 11991c9fa8fSAl Viro exp2 = exp; 1201da177e4SLinus Torvalds } 12191c9fa8fSAl Viro path_put(&path); 12291c9fa8fSAl Viro exp_put(exp2); 1231da177e4SLinus Torvalds out: 1241da177e4SLinus Torvalds return err; 1251da177e4SLinus Torvalds } 1261da177e4SLinus Torvalds 127289ede45SJ. Bruce Fields static void follow_to_parent(struct path *path) 128289ede45SJ. Bruce Fields { 129289ede45SJ. Bruce Fields struct dentry *dp; 130289ede45SJ. Bruce Fields 131289ede45SJ. Bruce Fields while (path->dentry == path->mnt->mnt_root && follow_up(path)) 132289ede45SJ. Bruce Fields ; 133289ede45SJ. Bruce Fields dp = dget_parent(path->dentry); 134289ede45SJ. Bruce Fields dput(path->dentry); 135289ede45SJ. Bruce Fields path->dentry = dp; 136289ede45SJ. Bruce Fields } 137289ede45SJ. Bruce Fields 138289ede45SJ. Bruce Fields static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) 139289ede45SJ. Bruce Fields { 140289ede45SJ. Bruce Fields struct svc_export *exp2; 141289ede45SJ. Bruce Fields struct path path = {.mnt = mntget((*exp)->ex_path.mnt), 142289ede45SJ. Bruce Fields .dentry = dget(dparent)}; 143289ede45SJ. Bruce Fields 144289ede45SJ. Bruce Fields follow_to_parent(&path); 145289ede45SJ. Bruce Fields 146289ede45SJ. Bruce Fields exp2 = rqst_exp_parent(rqstp, &path); 147289ede45SJ. Bruce Fields if (PTR_ERR(exp2) == -ENOENT) { 148289ede45SJ. Bruce Fields *dentryp = dget(dparent); 149289ede45SJ. Bruce Fields } else if (IS_ERR(exp2)) { 150289ede45SJ. Bruce Fields path_put(&path); 151289ede45SJ. Bruce Fields return PTR_ERR(exp2); 152289ede45SJ. Bruce Fields } else { 153289ede45SJ. Bruce Fields *dentryp = dget(path.dentry); 154289ede45SJ. Bruce Fields exp_put(*exp); 155289ede45SJ. Bruce Fields *exp = exp2; 156289ede45SJ. Bruce Fields } 157289ede45SJ. Bruce Fields path_put(&path); 158289ede45SJ. Bruce Fields return 0; 159289ede45SJ. Bruce Fields } 160289ede45SJ. Bruce Fields 16182ead7feSJ. Bruce Fields /* 16282ead7feSJ. Bruce Fields * For nfsd purposes, we treat V4ROOT exports as though there was an 16382ead7feSJ. Bruce Fields * export at *every* directory. 16482ead7feSJ. Bruce Fields */ 1653227fa41SJ. Bruce Fields int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) 16682ead7feSJ. Bruce Fields { 16782ead7feSJ. Bruce Fields if (d_mountpoint(dentry)) 16882ead7feSJ. Bruce Fields return 1; 16982ead7feSJ. Bruce Fields if (!(exp->ex_flags & NFSEXP_V4ROOT)) 17082ead7feSJ. Bruce Fields return 0; 17182ead7feSJ. Bruce Fields return dentry->d_inode != NULL; 17282ead7feSJ. Bruce Fields } 17382ead7feSJ. Bruce Fields 1746264d69dSAl Viro __be32 1756c0a654dSJ. Bruce Fields nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, 1765a022fc8SChuck Lever const char *name, unsigned int len, 1776c0a654dSJ. Bruce Fields struct svc_export **exp_ret, struct dentry **dentry_ret) 1781da177e4SLinus Torvalds { 1791da177e4SLinus Torvalds struct svc_export *exp; 1801da177e4SLinus Torvalds struct dentry *dparent; 1811da177e4SLinus Torvalds struct dentry *dentry; 1826264d69dSAl Viro __be32 err; 1836264d69dSAl Viro int host_err; 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds /* Obtain dentry and export. */ 1888837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 1891da177e4SLinus Torvalds if (err) 1901da177e4SLinus Torvalds return err; 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds dparent = fhp->fh_dentry; 1931da177e4SLinus Torvalds exp = fhp->fh_export; 1941da177e4SLinus Torvalds exp_get(exp); 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds /* Lookup the name, but don't follow links */ 1971da177e4SLinus Torvalds if (isdotent(name, len)) { 1981da177e4SLinus Torvalds if (len==1) 1991da177e4SLinus Torvalds dentry = dget(dparent); 20054775491SJan Blunck else if (dparent != exp->ex_path.dentry) 2011da177e4SLinus Torvalds dentry = dget_parent(dparent); 202fed83811SJ. Bruce Fields else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) 2031da177e4SLinus Torvalds dentry = dget(dparent); /* .. == . just like at / */ 2041da177e4SLinus Torvalds else { 2051da177e4SLinus Torvalds /* checking mountpoint crossing is very different when stepping up */ 206289ede45SJ. Bruce Fields host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); 207289ede45SJ. Bruce Fields if (host_err) 2081da177e4SLinus Torvalds goto out_nfserr; 2091da177e4SLinus Torvalds } 2101da177e4SLinus Torvalds } else { 2111da177e4SLinus Torvalds fh_lock(fhp); 2121da177e4SLinus Torvalds dentry = lookup_one_len(name, dparent, len); 2136264d69dSAl Viro host_err = PTR_ERR(dentry); 2141da177e4SLinus Torvalds if (IS_ERR(dentry)) 2151da177e4SLinus Torvalds goto out_nfserr; 2161da177e4SLinus Torvalds /* 2171da177e4SLinus Torvalds * check if we have crossed a mount point ... 2181da177e4SLinus Torvalds */ 21982ead7feSJ. Bruce Fields if (nfsd_mountpoint(dentry, exp)) { 2206264d69dSAl Viro if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 2211da177e4SLinus Torvalds dput(dentry); 2221da177e4SLinus Torvalds goto out_nfserr; 2231da177e4SLinus Torvalds } 2241da177e4SLinus Torvalds } 2251da177e4SLinus Torvalds } 2266c0a654dSJ. Bruce Fields *dentry_ret = dentry; 2276c0a654dSJ. Bruce Fields *exp_ret = exp; 2286c0a654dSJ. Bruce Fields return 0; 2296c0a654dSJ. Bruce Fields 2306c0a654dSJ. Bruce Fields out_nfserr: 2316c0a654dSJ. Bruce Fields exp_put(exp); 2326c0a654dSJ. Bruce Fields return nfserrno(host_err); 2336c0a654dSJ. Bruce Fields } 2346c0a654dSJ. Bruce Fields 2356c0a654dSJ. Bruce Fields /* 2366c0a654dSJ. Bruce Fields * Look up one component of a pathname. 2376c0a654dSJ. Bruce Fields * N.B. After this call _both_ fhp and resfh need an fh_put 2386c0a654dSJ. Bruce Fields * 2396c0a654dSJ. Bruce Fields * If the lookup would cross a mountpoint, and the mounted filesystem 2406c0a654dSJ. Bruce Fields * is exported to the client with NFSEXP_NOHIDE, then the lookup is 2416c0a654dSJ. Bruce Fields * accepted as it stands and the mounted directory is 2426c0a654dSJ. Bruce Fields * returned. Otherwise the covered directory is returned. 2436c0a654dSJ. Bruce Fields * NOTE: this mountpoint crossing is not supported properly by all 2446c0a654dSJ. Bruce Fields * clients and is explicitly disallowed for NFSv3 2456c0a654dSJ. Bruce Fields * NeilBrown <neilb@cse.unsw.edu.au> 2466c0a654dSJ. Bruce Fields */ 2476c0a654dSJ. Bruce Fields __be32 2486c0a654dSJ. Bruce Fields nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 2495a022fc8SChuck Lever unsigned int len, struct svc_fh *resfh) 2506c0a654dSJ. Bruce Fields { 2516c0a654dSJ. Bruce Fields struct svc_export *exp; 2526c0a654dSJ. Bruce Fields struct dentry *dentry; 2536c0a654dSJ. Bruce Fields __be32 err; 2546c0a654dSJ. Bruce Fields 2556c0a654dSJ. Bruce Fields err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); 2566c0a654dSJ. Bruce Fields if (err) 2576c0a654dSJ. Bruce Fields return err; 25832c1eb0cSAndy Adamson err = check_nfsd_access(exp, rqstp); 25932c1eb0cSAndy Adamson if (err) 26032c1eb0cSAndy Adamson goto out; 2611da177e4SLinus Torvalds /* 2621da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2631da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2641da177e4SLinus Torvalds */ 2651da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2661da177e4SLinus Torvalds if (!err && !dentry->d_inode) 2671da177e4SLinus Torvalds err = nfserr_noent; 26832c1eb0cSAndy Adamson out: 2691da177e4SLinus Torvalds dput(dentry); 2701da177e4SLinus Torvalds exp_put(exp); 2711da177e4SLinus Torvalds return err; 2721da177e4SLinus Torvalds } 2731da177e4SLinus Torvalds 2746c0a654dSJ. Bruce Fields 2751da177e4SLinus Torvalds /* 2761da177e4SLinus Torvalds * Set various file attributes. 2771da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 2781da177e4SLinus Torvalds */ 2796264d69dSAl Viro __be32 2801da177e4SLinus Torvalds nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 2811da177e4SLinus Torvalds int check_guard, time_t guardtime) 2821da177e4SLinus Torvalds { 2831da177e4SLinus Torvalds struct dentry *dentry; 2841da177e4SLinus Torvalds struct inode *inode; 2858837abcaSMiklos Szeredi int accmode = NFSD_MAY_SATTR; 2861da177e4SLinus Torvalds int ftype = 0; 2876264d69dSAl Viro __be32 err; 2886264d69dSAl Viro int host_err; 2891da177e4SLinus Torvalds int size_change = 0; 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) 2928837abcaSMiklos Szeredi accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; 2931da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) 2941da177e4SLinus Torvalds ftype = S_IFREG; 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds /* Get inode */ 2971da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 29815b7a1b8SNeilBrown if (err) 2991da177e4SLinus Torvalds goto out; 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds dentry = fhp->fh_dentry; 3021da177e4SLinus Torvalds inode = dentry->d_inode; 3031da177e4SLinus Torvalds 30415b7a1b8SNeilBrown /* Ignore any mode updates on symlinks */ 30515b7a1b8SNeilBrown if (S_ISLNK(inode->i_mode)) 30615b7a1b8SNeilBrown iap->ia_valid &= ~ATTR_MODE; 30715b7a1b8SNeilBrown 30815b7a1b8SNeilBrown if (!iap->ia_valid) 30915b7a1b8SNeilBrown goto out; 31015b7a1b8SNeilBrown 3119c85fca5SChristoph Hellwig /* 3129c85fca5SChristoph Hellwig * NFSv2 does not differentiate between "set-[ac]time-to-now" 3131da177e4SLinus Torvalds * which only requires access, and "set-[ac]time-to-X" which 3141da177e4SLinus Torvalds * requires ownership. 3151da177e4SLinus Torvalds * So if it looks like it might be "set both to the same time which 3161da177e4SLinus Torvalds * is close to now", and if inode_change_ok fails, then we 3171da177e4SLinus Torvalds * convert to "set to now" instead of "set to explicit time" 3181da177e4SLinus Torvalds * 3191da177e4SLinus Torvalds * We only call inode_change_ok as the last test as technically 3201da177e4SLinus Torvalds * it is not an interface that we should be using. It is only 3211da177e4SLinus Torvalds * valid if the filesystem does not define it's own i_op->setattr. 3221da177e4SLinus Torvalds */ 3231da177e4SLinus Torvalds #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) 3241da177e4SLinus Torvalds #define MAX_TOUCH_TIME_ERROR (30*60) 3259c85fca5SChristoph Hellwig if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && 3269c85fca5SChristoph Hellwig iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { 3279c85fca5SChristoph Hellwig /* 3289c85fca5SChristoph Hellwig * Looks probable. 3299c85fca5SChristoph Hellwig * 3309c85fca5SChristoph Hellwig * Now just make sure time is in the right ballpark. 3319c85fca5SChristoph Hellwig * Solaris, at least, doesn't seem to care what the time 3329c85fca5SChristoph Hellwig * request is. We require it be within 30 minutes of now. 3331da177e4SLinus Torvalds */ 3341da177e4SLinus Torvalds time_t delta = iap->ia_atime.tv_sec - get_seconds(); 3359c85fca5SChristoph Hellwig if (delta < 0) 3369c85fca5SChristoph Hellwig delta = -delta; 3371da177e4SLinus Torvalds if (delta < MAX_TOUCH_TIME_ERROR && 3381da177e4SLinus Torvalds inode_change_ok(inode, iap) != 0) { 3399c85fca5SChristoph Hellwig /* 3409c85fca5SChristoph Hellwig * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. 3419c85fca5SChristoph Hellwig * This will cause notify_change to set these times 3429c85fca5SChristoph Hellwig * to "now" 3431da177e4SLinus Torvalds */ 3441da177e4SLinus Torvalds iap->ia_valid &= ~BOTH_TIME_SET; 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds } 3471da177e4SLinus Torvalds 3489c85fca5SChristoph Hellwig /* 3499c85fca5SChristoph Hellwig * The size case is special. 3509c85fca5SChristoph Hellwig * It changes the file as well as the attributes. 3519c85fca5SChristoph Hellwig */ 3521da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) { 3531da177e4SLinus Torvalds if (iap->ia_size < inode->i_size) { 3548837abcaSMiklos Szeredi err = nfsd_permission(rqstp, fhp->fh_export, dentry, 3558837abcaSMiklos Szeredi NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE); 3561da177e4SLinus Torvalds if (err) 3571da177e4SLinus Torvalds goto out; 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds /* 3611da177e4SLinus Torvalds * If we are changing the size of the file, then 3621da177e4SLinus Torvalds * we need to break all leases. 3631da177e4SLinus Torvalds */ 3646264d69dSAl Viro host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK); 3656264d69dSAl Viro if (host_err == -EWOULDBLOCK) 3666264d69dSAl Viro host_err = -ETIMEDOUT; 3676264d69dSAl Viro if (host_err) /* ENOMEM or EWOULDBLOCK */ 3681da177e4SLinus Torvalds goto out_nfserr; 3691da177e4SLinus Torvalds 3706264d69dSAl Viro host_err = get_write_access(inode); 3716264d69dSAl Viro if (host_err) 3721da177e4SLinus Torvalds goto out_nfserr; 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds size_change = 1; 3756264d69dSAl Viro host_err = locks_verify_truncate(inode, NULL, iap->ia_size); 3766264d69dSAl Viro if (host_err) { 3771da177e4SLinus Torvalds put_write_access(inode); 3781da177e4SLinus Torvalds goto out_nfserr; 3791da177e4SLinus Torvalds } 38090c0af05SJan Kara vfs_dq_init(inode); 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds 383ca456252SJeff Layton /* sanitize the mode change */ 3841da177e4SLinus Torvalds if (iap->ia_valid & ATTR_MODE) { 3851da177e4SLinus Torvalds iap->ia_mode &= S_IALLUGO; 386dee3209dSJeff Layton iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); 3871da177e4SLinus Torvalds } 388ca456252SJeff Layton 389ca456252SJeff Layton /* Revoke setuid/setgid on chown */ 3900953e620SSachin S. Prabhu if (!S_ISDIR(inode->i_mode) && 3910953e620SSachin S. Prabhu (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) || 3920953e620SSachin S. Prabhu ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) { 393ca456252SJeff Layton iap->ia_valid |= ATTR_KILL_PRIV; 394ca456252SJeff Layton if (iap->ia_valid & ATTR_MODE) { 395ca456252SJeff Layton /* we're setting mode too, just clear the s*id bits */ 396ca456252SJeff Layton iap->ia_mode &= ~S_ISUID; 397ca456252SJeff Layton if (iap->ia_mode & S_IXGRP) 3988a0ce7d9SJeff Layton iap->ia_mode &= ~S_ISGID; 3998a0ce7d9SJeff Layton } else { 400ca456252SJeff Layton /* set ATTR_KILL_* bits and let VFS handle it */ 401ca456252SJeff Layton iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); 402ca456252SJeff Layton } 4038a0ce7d9SJeff Layton } 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds /* Change the attributes. */ 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds err = nfserr_notsync; 4101da177e4SLinus Torvalds if (!check_guard || guardtime == inode->i_ctime.tv_sec) { 4111da177e4SLinus Torvalds fh_lock(fhp); 4126264d69dSAl Viro host_err = notify_change(dentry, iap); 4136264d69dSAl Viro err = nfserrno(host_err); 4141da177e4SLinus Torvalds fh_unlock(fhp); 4151da177e4SLinus Torvalds } 4161da177e4SLinus Torvalds if (size_change) 4171da177e4SLinus Torvalds put_write_access(inode); 4181da177e4SLinus Torvalds if (!err) 4191da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 4201da177e4SLinus Torvalds write_inode_now(inode, 1); 4211da177e4SLinus Torvalds out: 4221da177e4SLinus Torvalds return err; 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds out_nfserr: 4256264d69dSAl Viro err = nfserrno(host_err); 4261da177e4SLinus Torvalds goto out; 4271da177e4SLinus Torvalds } 4281da177e4SLinus Torvalds 4295be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V2_ACL) || \ 4305be196e5SChristoph Hellwig defined(CONFIG_NFSD_V3_ACL) || \ 4315be196e5SChristoph Hellwig defined(CONFIG_NFSD_V4) 4325be196e5SChristoph Hellwig static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) 4335be196e5SChristoph Hellwig { 4345be196e5SChristoph Hellwig ssize_t buflen; 4356c6a426fSKrishna Kumar ssize_t ret; 4361da177e4SLinus Torvalds 4375be196e5SChristoph Hellwig buflen = vfs_getxattr(dentry, key, NULL, 0); 4385be196e5SChristoph Hellwig if (buflen <= 0) 4395be196e5SChristoph Hellwig return buflen; 4405be196e5SChristoph Hellwig 4415be196e5SChristoph Hellwig *buf = kmalloc(buflen, GFP_KERNEL); 4425be196e5SChristoph Hellwig if (!*buf) 4435be196e5SChristoph Hellwig return -ENOMEM; 4445be196e5SChristoph Hellwig 4456c6a426fSKrishna Kumar ret = vfs_getxattr(dentry, key, *buf, buflen); 4466c6a426fSKrishna Kumar if (ret < 0) 4476c6a426fSKrishna Kumar kfree(*buf); 4486c6a426fSKrishna Kumar return ret; 4495be196e5SChristoph Hellwig } 4505be196e5SChristoph Hellwig #endif 4515be196e5SChristoph Hellwig 4525be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V4) 4531da177e4SLinus Torvalds static int 4541da177e4SLinus Torvalds set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) 4551da177e4SLinus Torvalds { 4561da177e4SLinus Torvalds int len; 4571da177e4SLinus Torvalds size_t buflen; 4581da177e4SLinus Torvalds char *buf = NULL; 4591da177e4SLinus Torvalds int error = 0; 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds buflen = posix_acl_xattr_size(pacl->a_count); 4621da177e4SLinus Torvalds buf = kmalloc(buflen, GFP_KERNEL); 4631da177e4SLinus Torvalds error = -ENOMEM; 4641da177e4SLinus Torvalds if (buf == NULL) 4651da177e4SLinus Torvalds goto out; 4661da177e4SLinus Torvalds 4671da177e4SLinus Torvalds len = posix_acl_to_xattr(pacl, buf, buflen); 4681da177e4SLinus Torvalds if (len < 0) { 4691da177e4SLinus Torvalds error = len; 4701da177e4SLinus Torvalds goto out; 4711da177e4SLinus Torvalds } 4721da177e4SLinus Torvalds 4735be196e5SChristoph Hellwig error = vfs_setxattr(dentry, key, buf, len, 0); 4741da177e4SLinus Torvalds out: 4751da177e4SLinus Torvalds kfree(buf); 4761da177e4SLinus Torvalds return error; 4771da177e4SLinus Torvalds } 4781da177e4SLinus Torvalds 4796264d69dSAl Viro __be32 4801da177e4SLinus Torvalds nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, 4811da177e4SLinus Torvalds struct nfs4_acl *acl) 4821da177e4SLinus Torvalds { 4836264d69dSAl Viro __be32 error; 4846264d69dSAl Viro int host_error; 4851da177e4SLinus Torvalds struct dentry *dentry; 4861da177e4SLinus Torvalds struct inode *inode; 4871da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 4881da177e4SLinus Torvalds unsigned int flags = 0; 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds /* Get inode */ 4918837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); 4921da177e4SLinus Torvalds if (error) 4934b2ca38aSJ. Bruce Fields return error; 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds dentry = fhp->fh_dentry; 4961da177e4SLinus Torvalds inode = dentry->d_inode; 4971da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) 4981da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 4991da177e4SLinus Torvalds 5006264d69dSAl Viro host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); 5016264d69dSAl Viro if (host_error == -EINVAL) { 5024b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 5036264d69dSAl Viro } else if (host_error < 0) 5041da177e4SLinus Torvalds goto out_nfserr; 5051da177e4SLinus Torvalds 5066264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); 5076264d69dSAl Viro if (host_error < 0) 5084b2ca38aSJ. Bruce Fields goto out_release; 5091da177e4SLinus Torvalds 5104b2ca38aSJ. Bruce Fields if (S_ISDIR(inode->i_mode)) 5116264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); 5121da177e4SLinus Torvalds 5134b2ca38aSJ. Bruce Fields out_release: 5141da177e4SLinus Torvalds posix_acl_release(pacl); 5151da177e4SLinus Torvalds posix_acl_release(dpacl); 5161da177e4SLinus Torvalds out_nfserr: 517f34f9242SJ. Bruce Fields if (host_error == -EOPNOTSUPP) 5184b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 519f34f9242SJ. Bruce Fields else 5204b2ca38aSJ. Bruce Fields return nfserrno(host_error); 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds static struct posix_acl * 5241da177e4SLinus Torvalds _get_posix_acl(struct dentry *dentry, char *key) 5251da177e4SLinus Torvalds { 5265be196e5SChristoph Hellwig void *buf = NULL; 5271da177e4SLinus Torvalds struct posix_acl *pacl = NULL; 5285be196e5SChristoph Hellwig int buflen; 5291da177e4SLinus Torvalds 5305be196e5SChristoph Hellwig buflen = nfsd_getxattr(dentry, key, &buf); 5315be196e5SChristoph Hellwig if (!buflen) 5325be196e5SChristoph Hellwig buflen = -ENODATA; 5335be196e5SChristoph Hellwig if (buflen <= 0) 5345be196e5SChristoph Hellwig return ERR_PTR(buflen); 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds pacl = posix_acl_from_xattr(buf, buflen); 5371da177e4SLinus Torvalds kfree(buf); 5381da177e4SLinus Torvalds return pacl; 5391da177e4SLinus Torvalds } 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds int 5421da177e4SLinus Torvalds nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) 5431da177e4SLinus Torvalds { 5441da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 5451da177e4SLinus Torvalds int error = 0; 5461da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 5471da177e4SLinus Torvalds unsigned int flags = 0; 5481da177e4SLinus Torvalds 5499a59f452SChristoph Hellwig pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); 5501da177e4SLinus Torvalds if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) 5511da177e4SLinus Torvalds pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 5521da177e4SLinus Torvalds if (IS_ERR(pacl)) { 5531da177e4SLinus Torvalds error = PTR_ERR(pacl); 5541da177e4SLinus Torvalds pacl = NULL; 5551da177e4SLinus Torvalds goto out; 5561da177e4SLinus Torvalds } 5571da177e4SLinus Torvalds 5581da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) { 5599a59f452SChristoph Hellwig dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); 5601da177e4SLinus Torvalds if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) 5611da177e4SLinus Torvalds dpacl = NULL; 5621da177e4SLinus Torvalds else if (IS_ERR(dpacl)) { 5631da177e4SLinus Torvalds error = PTR_ERR(dpacl); 5641da177e4SLinus Torvalds dpacl = NULL; 5651da177e4SLinus Torvalds goto out; 5661da177e4SLinus Torvalds } 5671da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5681da177e4SLinus Torvalds } 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); 5711da177e4SLinus Torvalds if (IS_ERR(*acl)) { 5721da177e4SLinus Torvalds error = PTR_ERR(*acl); 5731da177e4SLinus Torvalds *acl = NULL; 5741da177e4SLinus Torvalds } 5751da177e4SLinus Torvalds out: 5761da177e4SLinus Torvalds posix_acl_release(pacl); 5771da177e4SLinus Torvalds posix_acl_release(dpacl); 5781da177e4SLinus Torvalds return error; 5791da177e4SLinus Torvalds } 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds #endif /* defined(CONFIG_NFS_V4) */ 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 5841da177e4SLinus Torvalds /* 5851da177e4SLinus Torvalds * Check server access rights to a file system object 5861da177e4SLinus Torvalds */ 5871da177e4SLinus Torvalds struct accessmap { 5881da177e4SLinus Torvalds u32 access; 5891da177e4SLinus Torvalds int how; 5901da177e4SLinus Torvalds }; 5911da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 5928837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 5938837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 5948837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, 5958837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds { 0, 0 } 5981da177e4SLinus Torvalds }; 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 6018837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6028837abcaSMiklos Szeredi { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, 6038837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, 6048837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, 6058837abcaSMiklos Szeredi { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvalds { 0, 0 } 6081da177e4SLinus Torvalds }; 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 6111da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 6121da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 6131da177e4SLinus Torvalds * (which really, the server doesn't care about). So 6141da177e4SLinus Torvalds * We provide simple access checking for them, looking 6151da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 6161da177e4SLinus Torvalds * filesystem checks 6171da177e4SLinus Torvalds */ 6188837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6198837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6208837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6218837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds { 0, 0 } 6241da177e4SLinus Torvalds }; 6251da177e4SLinus Torvalds 6266264d69dSAl Viro __be32 6271da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 6281da177e4SLinus Torvalds { 6291da177e4SLinus Torvalds struct accessmap *map; 6301da177e4SLinus Torvalds struct svc_export *export; 6311da177e4SLinus Torvalds struct dentry *dentry; 6321da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 6336264d69dSAl Viro __be32 error; 6341da177e4SLinus Torvalds 6358837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 6361da177e4SLinus Torvalds if (error) 6371da177e4SLinus Torvalds goto out; 6381da177e4SLinus Torvalds 6391da177e4SLinus Torvalds export = fhp->fh_export; 6401da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds if (S_ISREG(dentry->d_inode->i_mode)) 6431da177e4SLinus Torvalds map = nfs3_regaccess; 6441da177e4SLinus Torvalds else if (S_ISDIR(dentry->d_inode->i_mode)) 6451da177e4SLinus Torvalds map = nfs3_diraccess; 6461da177e4SLinus Torvalds else 6471da177e4SLinus Torvalds map = nfs3_anyaccess; 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds query = *access; 6511da177e4SLinus Torvalds for (; map->access; map++) { 6521da177e4SLinus Torvalds if (map->access & query) { 6536264d69dSAl Viro __be32 err2; 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds sresult |= map->access; 6561da177e4SLinus Torvalds 6570ec757dfSJ. Bruce Fields err2 = nfsd_permission(rqstp, export, dentry, map->how); 6581da177e4SLinus Torvalds switch (err2) { 6591da177e4SLinus Torvalds case nfs_ok: 6601da177e4SLinus Torvalds result |= map->access; 6611da177e4SLinus Torvalds break; 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 6641da177e4SLinus Torvalds * rather than an error occurred */ 6651da177e4SLinus Torvalds case nfserr_rofs: 6661da177e4SLinus Torvalds case nfserr_acces: 6671da177e4SLinus Torvalds case nfserr_perm: 6681da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 6691da177e4SLinus Torvalds break; 6701da177e4SLinus Torvalds default: 6711da177e4SLinus Torvalds error = err2; 6721da177e4SLinus Torvalds goto out; 6731da177e4SLinus Torvalds } 6741da177e4SLinus Torvalds } 6751da177e4SLinus Torvalds } 6761da177e4SLinus Torvalds *access = result; 6771da177e4SLinus Torvalds if (supported) 6781da177e4SLinus Torvalds *supported = sresult; 6791da177e4SLinus Torvalds 6801da177e4SLinus Torvalds out: 6811da177e4SLinus Torvalds return error; 6821da177e4SLinus Torvalds } 6831da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds /* 6881da177e4SLinus Torvalds * Open an existing file or directory. 6891da177e4SLinus Torvalds * The access argument indicates the type of open (read/write/lock) 6901da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 6911da177e4SLinus Torvalds */ 6926264d69dSAl Viro __be32 6931da177e4SLinus Torvalds nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 6941da177e4SLinus Torvalds int access, struct file **filp) 6951da177e4SLinus Torvalds { 6961da177e4SLinus Torvalds struct dentry *dentry; 6971da177e4SLinus Torvalds struct inode *inode; 6986264d69dSAl Viro int flags = O_RDONLY|O_LARGEFILE; 6996264d69dSAl Viro __be32 err; 7006264d69dSAl Viro int host_err; 7011da177e4SLinus Torvalds 702e0e81739SDavid Howells validate_process_creds(); 703e0e81739SDavid Howells 7041da177e4SLinus Torvalds /* 7051da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 7061da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 7071da177e4SLinus Torvalds * in case a chmod has now revoked permission. 7081da177e4SLinus Torvalds */ 7098837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE); 7101da177e4SLinus Torvalds if (err) 7111da177e4SLinus Torvalds goto out; 7121da177e4SLinus Torvalds 7131da177e4SLinus Torvalds dentry = fhp->fh_dentry; 7141da177e4SLinus Torvalds inode = dentry->d_inode; 7151da177e4SLinus Torvalds 7161da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 7171da177e4SLinus Torvalds * or any access when mandatory locking enabled 7181da177e4SLinus Torvalds */ 7191da177e4SLinus Torvalds err = nfserr_perm; 7208837abcaSMiklos Szeredi if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE)) 7211da177e4SLinus Torvalds goto out; 7225e7fc436SJ. Bruce Fields /* 7235e7fc436SJ. Bruce Fields * We must ignore files (but only files) which might have mandatory 7245e7fc436SJ. Bruce Fields * locks on them because there is no way to know if the accesser has 7255e7fc436SJ. Bruce Fields * the lock. 7265e7fc436SJ. Bruce Fields */ 7275e7fc436SJ. Bruce Fields if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) 7281da177e4SLinus Torvalds goto out; 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds if (!inode->i_fop) 7311da177e4SLinus Torvalds goto out; 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds /* 7341da177e4SLinus Torvalds * Check to see if there are any leases on this file. 7351da177e4SLinus Torvalds * This may block while leases are broken. 7361da177e4SLinus Torvalds */ 7378837abcaSMiklos Szeredi host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? FMODE_WRITE : 0)); 7386264d69dSAl Viro if (host_err == -EWOULDBLOCK) 7396264d69dSAl Viro host_err = -ETIMEDOUT; 7406264d69dSAl Viro if (host_err) /* NOMEM or WOULDBLOCK */ 7411da177e4SLinus Torvalds goto out_nfserr; 7421da177e4SLinus Torvalds 7438837abcaSMiklos Szeredi if (access & NFSD_MAY_WRITE) { 7448837abcaSMiklos Szeredi if (access & NFSD_MAY_READ) 7459ecb6a08SJ. Bruce Fields flags = O_RDWR|O_LARGEFILE; 7469ecb6a08SJ. Bruce Fields else 7471da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 7481da177e4SLinus Torvalds 74990c0af05SJan Kara vfs_dq_init(inode); 7501da177e4SLinus Torvalds } 75154775491SJan Blunck *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt), 752033a666cSDavid Howells flags, current_cred()); 7531da177e4SLinus Torvalds if (IS_ERR(*filp)) 7546264d69dSAl Viro host_err = PTR_ERR(*filp); 7551da177e4SLinus Torvalds out_nfserr: 7566264d69dSAl Viro err = nfserrno(host_err); 7571da177e4SLinus Torvalds out: 758e0e81739SDavid Howells validate_process_creds(); 7591da177e4SLinus Torvalds return err; 7601da177e4SLinus Torvalds } 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds /* 7631da177e4SLinus Torvalds * Close a file. 7641da177e4SLinus Torvalds */ 7651da177e4SLinus Torvalds void 7661da177e4SLinus Torvalds nfsd_close(struct file *filp) 7671da177e4SLinus Torvalds { 7681da177e4SLinus Torvalds fput(filp); 7691da177e4SLinus Torvalds } 7701da177e4SLinus Torvalds 7719a8d248eSJ. Bruce Fields /* 772*6a68f89eSChristoph Hellwig * Sync a directory to disk. 773*6a68f89eSChristoph Hellwig * 774*6a68f89eSChristoph Hellwig * We can't just call vfs_fsync because our requirements are slightly odd: 775*6a68f89eSChristoph Hellwig * 776*6a68f89eSChristoph Hellwig * a) we do not have a file struct available 777*6a68f89eSChristoph Hellwig * b) we expect to have i_mutex already held by the caller 7789a8d248eSJ. Bruce Fields */ 779f193fbabSYAMAMOTO Takashi int 780*6a68f89eSChristoph Hellwig nfsd_sync_dir(struct dentry *dentry) 7811da177e4SLinus Torvalds { 782*6a68f89eSChristoph Hellwig struct inode *inode = dentry->d_inode; 783*6a68f89eSChristoph Hellwig int error; 784*6a68f89eSChristoph Hellwig 785*6a68f89eSChristoph Hellwig WARN_ON(!mutex_is_locked(&inode->i_mutex)); 786*6a68f89eSChristoph Hellwig 787*6a68f89eSChristoph Hellwig error = filemap_write_and_wait(inode->i_mapping); 788*6a68f89eSChristoph Hellwig if (!error && inode->i_fop->fsync) 789*6a68f89eSChristoph Hellwig error = inode->i_fop->fsync(NULL, dentry, 0); 790*6a68f89eSChristoph Hellwig return error; 7911da177e4SLinus Torvalds } 7921da177e4SLinus Torvalds 7931da177e4SLinus Torvalds /* 7941da177e4SLinus Torvalds * Obtain the readahead parameters for the file 7951da177e4SLinus Torvalds * specified by (dev, ino). 7961da177e4SLinus Torvalds */ 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds static inline struct raparms * 7991da177e4SLinus Torvalds nfsd_get_raparms(dev_t dev, ino_t ino) 8001da177e4SLinus Torvalds { 8011da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 8021da177e4SLinus Torvalds int depth = 0; 803fce1456aSGreg Banks unsigned int hash; 804fce1456aSGreg Banks struct raparm_hbucket *rab; 8051da177e4SLinus Torvalds 806fce1456aSGreg Banks hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; 807fce1456aSGreg Banks rab = &raparm_hash[hash]; 808fce1456aSGreg Banks 809fce1456aSGreg Banks spin_lock(&rab->pb_lock); 810fce1456aSGreg Banks for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { 8111da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 8121da177e4SLinus Torvalds goto found; 8131da177e4SLinus Torvalds depth++; 8141da177e4SLinus Torvalds if (ra->p_count == 0) 8151da177e4SLinus Torvalds frap = rap; 8161da177e4SLinus Torvalds } 8171da177e4SLinus Torvalds depth = nfsdstats.ra_size*11/10; 8181da177e4SLinus Torvalds if (!frap) { 819fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8201da177e4SLinus Torvalds return NULL; 8211da177e4SLinus Torvalds } 8221da177e4SLinus Torvalds rap = frap; 8231da177e4SLinus Torvalds ra = *frap; 8241da177e4SLinus Torvalds ra->p_dev = dev; 8251da177e4SLinus Torvalds ra->p_ino = ino; 8261da177e4SLinus Torvalds ra->p_set = 0; 827fce1456aSGreg Banks ra->p_hindex = hash; 8281da177e4SLinus Torvalds found: 829fce1456aSGreg Banks if (rap != &rab->pb_head) { 8301da177e4SLinus Torvalds *rap = ra->p_next; 831fce1456aSGreg Banks ra->p_next = rab->pb_head; 832fce1456aSGreg Banks rab->pb_head = ra; 8331da177e4SLinus Torvalds } 8341da177e4SLinus Torvalds ra->p_count++; 8351da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 836fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8371da177e4SLinus Torvalds return ra; 8381da177e4SLinus Torvalds } 8391da177e4SLinus Torvalds 8401da177e4SLinus Torvalds /* 841cf8208d0SJens Axboe * Grab and keep cached pages associated with a file in the svc_rqst 842cf8208d0SJens Axboe * so that they can be passed to the network sendmsg/sendpage routines 843cf8208d0SJens Axboe * directly. They will be released after the sending has completed. 8441da177e4SLinus Torvalds */ 8451da177e4SLinus Torvalds static int 846cf8208d0SJens Axboe nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, 847cf8208d0SJens Axboe struct splice_desc *sd) 8481da177e4SLinus Torvalds { 849cf8208d0SJens Axboe struct svc_rqst *rqstp = sd->u.data; 85044524359SNeilBrown struct page **pp = rqstp->rq_respages + rqstp->rq_resused; 851cf8208d0SJens Axboe struct page *page = buf->page; 852cf8208d0SJens Axboe size_t size; 853cf8208d0SJens Axboe int ret; 8541da177e4SLinus Torvalds 855cac36bb0SJens Axboe ret = buf->ops->confirm(pipe, buf); 856cf8208d0SJens Axboe if (unlikely(ret)) 857cf8208d0SJens Axboe return ret; 858cf8208d0SJens Axboe 859cf8208d0SJens Axboe size = sd->len; 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 8621da177e4SLinus Torvalds get_page(page); 86344524359SNeilBrown put_page(*pp); 86444524359SNeilBrown *pp = page; 86544524359SNeilBrown rqstp->rq_resused++; 866cf8208d0SJens Axboe rqstp->rq_res.page_base = buf->offset; 8671da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 86844524359SNeilBrown } else if (page != pp[-1]) { 8691da177e4SLinus Torvalds get_page(page); 870250f3915SNeilBrown if (*pp) 87144524359SNeilBrown put_page(*pp); 87244524359SNeilBrown *pp = page; 87344524359SNeilBrown rqstp->rq_resused++; 8741da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 87544524359SNeilBrown } else 8761da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds return size; 8791da177e4SLinus Torvalds } 8801da177e4SLinus Torvalds 881cf8208d0SJens Axboe static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, 882cf8208d0SJens Axboe struct splice_desc *sd) 883cf8208d0SJens Axboe { 884cf8208d0SJens Axboe return __splice_from_pipe(pipe, sd, nfsd_splice_actor); 885cf8208d0SJens Axboe } 886cf8208d0SJens Axboe 887a8754beeSDave Hansen static inline int svc_msnfs(struct svc_fh *ffhp) 888a8754beeSDave Hansen { 889a8754beeSDave Hansen #ifdef MSNFS 890a8754beeSDave Hansen return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS); 891a8754beeSDave Hansen #else 892a8754beeSDave Hansen return 0; 893a8754beeSDave Hansen #endif 894a8754beeSDave Hansen } 895a8754beeSDave Hansen 8966264d69dSAl Viro static __be32 8971da177e4SLinus Torvalds nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 8981da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 8991da177e4SLinus Torvalds { 9001da177e4SLinus Torvalds struct inode *inode; 9011da177e4SLinus Torvalds struct raparms *ra; 9021da177e4SLinus Torvalds mm_segment_t oldfs; 9036264d69dSAl Viro __be32 err; 9046264d69dSAl Viro int host_err; 9051da177e4SLinus Torvalds 9061da177e4SLinus Torvalds err = nfserr_perm; 9077eaa36e2SJosef "Jeff" Sipek inode = file->f_path.dentry->d_inode; 908a8754beeSDave Hansen 909a8754beeSDave Hansen if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count)) 9101da177e4SLinus Torvalds goto out; 9111da177e4SLinus Torvalds 9121da177e4SLinus Torvalds /* Get readahead parameters */ 9131da177e4SLinus Torvalds ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); 9141da177e4SLinus Torvalds 9151da177e4SLinus Torvalds if (ra && ra->p_set) 9161da177e4SLinus Torvalds file->f_ra = ra->p_ra; 9171da177e4SLinus Torvalds 918cf8208d0SJens Axboe if (file->f_op->splice_read && rqstp->rq_splice_ok) { 919cf8208d0SJens Axboe struct splice_desc sd = { 920cf8208d0SJens Axboe .len = 0, 921cf8208d0SJens Axboe .total_len = *count, 922cf8208d0SJens Axboe .pos = offset, 923cf8208d0SJens Axboe .u.data = rqstp, 924cf8208d0SJens Axboe }; 925cf8208d0SJens Axboe 9264fbef206SJens Axboe rqstp->rq_resused = 1; 927cf8208d0SJens Axboe host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); 9281da177e4SLinus Torvalds } else { 9291da177e4SLinus Torvalds oldfs = get_fs(); 9301da177e4SLinus Torvalds set_fs(KERNEL_DS); 9316264d69dSAl Viro host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); 9321da177e4SLinus Torvalds set_fs(oldfs); 9331da177e4SLinus Torvalds } 9341da177e4SLinus Torvalds 9351da177e4SLinus Torvalds /* Write back readahead params */ 9361da177e4SLinus Torvalds if (ra) { 937fce1456aSGreg Banks struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; 938fce1456aSGreg Banks spin_lock(&rab->pb_lock); 9391da177e4SLinus Torvalds ra->p_ra = file->f_ra; 9401da177e4SLinus Torvalds ra->p_set = 1; 9411da177e4SLinus Torvalds ra->p_count--; 942fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 9431da177e4SLinus Torvalds } 9441da177e4SLinus Torvalds 9456264d69dSAl Viro if (host_err >= 0) { 9466264d69dSAl Viro nfsdstats.io_read += host_err; 9476264d69dSAl Viro *count = host_err; 9481da177e4SLinus Torvalds err = 0; 9497eaa36e2SJosef "Jeff" Sipek fsnotify_access(file->f_path.dentry); 9501da177e4SLinus Torvalds } else 9516264d69dSAl Viro err = nfserrno(host_err); 9521da177e4SLinus Torvalds out: 9531da177e4SLinus Torvalds return err; 9541da177e4SLinus Torvalds } 9551da177e4SLinus Torvalds 9569f708e40SNeil Brown static void kill_suid(struct dentry *dentry) 9579f708e40SNeil Brown { 9589f708e40SNeil Brown struct iattr ia; 959b5376771SSerge E. Hallyn ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; 9609f708e40SNeil Brown 9611b1dcc1bSJes Sorensen mutex_lock(&dentry->d_inode->i_mutex); 9629f708e40SNeil Brown notify_change(dentry, &ia); 9631b1dcc1bSJes Sorensen mutex_unlock(&dentry->d_inode->i_mutex); 9649f708e40SNeil Brown } 9659f708e40SNeil Brown 966d911df7bSJ. Bruce Fields /* 967d911df7bSJ. Bruce Fields * Gathered writes: If another process is currently writing to the file, 968d911df7bSJ. Bruce Fields * there's a high chance this is another nfsd (triggered by a bulk write 969d911df7bSJ. Bruce Fields * from a client's biod). Rather than syncing the file with each write 970d911df7bSJ. Bruce Fields * request, we sleep for 10 msec. 971d911df7bSJ. Bruce Fields * 972d911df7bSJ. Bruce Fields * I don't know if this roughly approximates C. Juszak's idea of 973d911df7bSJ. Bruce Fields * gathered writes, but it's a nice and simple solution (IMHO), and it 974d911df7bSJ. Bruce Fields * seems to work:-) 975d911df7bSJ. Bruce Fields * 976d911df7bSJ. Bruce Fields * Note: we do this only in the NFSv2 case, since v3 and higher have a 977d911df7bSJ. Bruce Fields * better tool (separate unstable writes and commits) for solving this 978d911df7bSJ. Bruce Fields * problem. 979d911df7bSJ. Bruce Fields */ 980d911df7bSJ. Bruce Fields static int wait_for_concurrent_writes(struct file *file) 981d911df7bSJ. Bruce Fields { 982d911df7bSJ. Bruce Fields struct inode *inode = file->f_path.dentry->d_inode; 983d911df7bSJ. Bruce Fields static ino_t last_ino; 984d911df7bSJ. Bruce Fields static dev_t last_dev; 985d911df7bSJ. Bruce Fields int err = 0; 986d911df7bSJ. Bruce Fields 987d911df7bSJ. Bruce Fields if (atomic_read(&inode->i_writecount) > 1 988d911df7bSJ. Bruce Fields || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 989d911df7bSJ. Bruce Fields dprintk("nfsd: write defer %d\n", task_pid_nr(current)); 990d911df7bSJ. Bruce Fields msleep(10); 991d911df7bSJ. Bruce Fields dprintk("nfsd: write resume %d\n", task_pid_nr(current)); 992d911df7bSJ. Bruce Fields } 993d911df7bSJ. Bruce Fields 994d911df7bSJ. Bruce Fields if (inode->i_state & I_DIRTY) { 995d911df7bSJ. Bruce Fields dprintk("nfsd: write sync %d\n", task_pid_nr(current)); 996*6a68f89eSChristoph Hellwig err = vfs_fsync(file, file->f_path.dentry, 0); 997d911df7bSJ. Bruce Fields } 998d911df7bSJ. Bruce Fields last_ino = inode->i_ino; 999d911df7bSJ. Bruce Fields last_dev = inode->i_sb->s_dev; 1000d911df7bSJ. Bruce Fields return err; 1001d911df7bSJ. Bruce Fields } 1002d911df7bSJ. Bruce Fields 10036264d69dSAl Viro static __be32 10041da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10051da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 100631dec253SDavid Shaw unsigned long *cnt, int *stablep) 10071da177e4SLinus Torvalds { 10081da177e4SLinus Torvalds struct svc_export *exp; 10091da177e4SLinus Torvalds struct dentry *dentry; 10101da177e4SLinus Torvalds struct inode *inode; 10111da177e4SLinus Torvalds mm_segment_t oldfs; 10126264d69dSAl Viro __be32 err = 0; 10136264d69dSAl Viro int host_err; 10141da177e4SLinus Torvalds int stable = *stablep; 101548e03bc5STrond Myklebust int use_wgather; 10161da177e4SLinus Torvalds 101745bd3b3dSNeilBrown #ifdef MSNFS 10181da177e4SLinus Torvalds err = nfserr_perm; 10191da177e4SLinus Torvalds 10201da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 102131dec253SDavid Shaw (!lock_may_write(file->f_path.dentry->d_inode, offset, *cnt))) 10221da177e4SLinus Torvalds goto out; 10231da177e4SLinus Torvalds #endif 10241da177e4SLinus Torvalds 10257eaa36e2SJosef "Jeff" Sipek dentry = file->f_path.dentry; 10261da177e4SLinus Torvalds inode = dentry->d_inode; 10271da177e4SLinus Torvalds exp = fhp->fh_export; 10281da177e4SLinus Torvalds 10291da177e4SLinus Torvalds /* 10301da177e4SLinus Torvalds * Request sync writes if 10311da177e4SLinus Torvalds * - the sync export option has been set, or 10321da177e4SLinus Torvalds * - the client requested O_SYNC behavior (NFSv3 feature). 10331da177e4SLinus Torvalds * - The file system doesn't support fsync(). 103448e03bc5STrond Myklebust * When NFSv2 gathered writes have been configured for this volume, 10351da177e4SLinus Torvalds * flushing the data to disk is handled separately below. 10361da177e4SLinus Torvalds */ 103748e03bc5STrond Myklebust use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); 10381da177e4SLinus Torvalds 10393ba15148SHarvey Harrison if (!file->f_op->fsync) {/* COMMIT3 cannot work */ 10401da177e4SLinus Torvalds stable = 2; 10411da177e4SLinus Torvalds *stablep = 2; /* FILE_SYNC */ 10421da177e4SLinus Torvalds } 10431da177e4SLinus Torvalds 10441da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 10451da177e4SLinus Torvalds stable = 0; 104648e03bc5STrond Myklebust if (stable && !use_wgather) { 1047db1dd4d3SJonathan Corbet spin_lock(&file->f_lock); 10481da177e4SLinus Torvalds file->f_flags |= O_SYNC; 1049db1dd4d3SJonathan Corbet spin_unlock(&file->f_lock); 1050db1dd4d3SJonathan Corbet } 10511da177e4SLinus Torvalds 10521da177e4SLinus Torvalds /* Write the data. */ 10531da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 10546264d69dSAl Viro host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); 10551da177e4SLinus Torvalds set_fs(oldfs); 1056e4636d53SJ. Bruce Fields if (host_err < 0) 1057e4636d53SJ. Bruce Fields goto out_nfserr; 1058a0d24b29SWei Yongjun *cnt = host_err; 105931dec253SDavid Shaw nfsdstats.io_write += host_err; 10607eaa36e2SJosef "Jeff" Sipek fsnotify_modify(file->f_path.dentry); 10611da177e4SLinus Torvalds 10621da177e4SLinus Torvalds /* clear setuid/setgid flag after write */ 1063e4636d53SJ. Bruce Fields if (inode->i_mode & (S_ISUID | S_ISGID)) 10649f708e40SNeil Brown kill_suid(dentry); 10651da177e4SLinus Torvalds 1066e4636d53SJ. Bruce Fields if (stable && use_wgather) 1067d911df7bSJ. Bruce Fields host_err = wait_for_concurrent_writes(file); 10681da177e4SLinus Torvalds 1069e4636d53SJ. Bruce Fields out_nfserr: 10706264d69dSAl Viro dprintk("nfsd: write complete host_err=%d\n", host_err); 1071a0d24b29SWei Yongjun if (host_err >= 0) 10721da177e4SLinus Torvalds err = 0; 1073a0d24b29SWei Yongjun else 10746264d69dSAl Viro err = nfserrno(host_err); 10751da177e4SLinus Torvalds out: 10761da177e4SLinus Torvalds return err; 10771da177e4SLinus Torvalds } 10781da177e4SLinus Torvalds 10791da177e4SLinus Torvalds /* 10801da177e4SLinus Torvalds * Read data from a file. count must contain the requested read count 10811da177e4SLinus Torvalds * on entry. On return, *count contains the number of bytes actually read. 10821da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10831da177e4SLinus Torvalds */ 10846264d69dSAl Viro __be32 10851da177e4SLinus Torvalds nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10861da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 10871da177e4SLinus Torvalds unsigned long *count) 10881da177e4SLinus Torvalds { 10896264d69dSAl Viro __be32 err; 10901da177e4SLinus Torvalds 10911da177e4SLinus Torvalds if (file) { 10920ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 10938837abcaSMiklos Szeredi NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); 10941da177e4SLinus Torvalds if (err) 10951da177e4SLinus Torvalds goto out; 10961da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 10971da177e4SLinus Torvalds } else { 10988837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 10991da177e4SLinus Torvalds if (err) 11001da177e4SLinus Torvalds goto out; 11011da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 11021da177e4SLinus Torvalds nfsd_close(file); 11031da177e4SLinus Torvalds } 11041da177e4SLinus Torvalds out: 11051da177e4SLinus Torvalds return err; 11061da177e4SLinus Torvalds } 11071da177e4SLinus Torvalds 11081da177e4SLinus Torvalds /* 11091da177e4SLinus Torvalds * Write data to a file. 11101da177e4SLinus Torvalds * The stable flag requests synchronous writes. 11111da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 11121da177e4SLinus Torvalds */ 11136264d69dSAl Viro __be32 11141da177e4SLinus Torvalds nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 111531dec253SDavid Shaw loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, 11161da177e4SLinus Torvalds int *stablep) 11171da177e4SLinus Torvalds { 11186264d69dSAl Viro __be32 err = 0; 11191da177e4SLinus Torvalds 11201da177e4SLinus Torvalds if (file) { 11210ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 11228837abcaSMiklos Szeredi NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); 11231da177e4SLinus Torvalds if (err) 11241da177e4SLinus Torvalds goto out; 11251da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, 11261da177e4SLinus Torvalds stablep); 11271da177e4SLinus Torvalds } else { 11288837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 11291da177e4SLinus Torvalds if (err) 11301da177e4SLinus Torvalds goto out; 11311da177e4SLinus Torvalds 11321da177e4SLinus Torvalds if (cnt) 11331da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, 11341da177e4SLinus Torvalds cnt, stablep); 11351da177e4SLinus Torvalds nfsd_close(file); 11361da177e4SLinus Torvalds } 11371da177e4SLinus Torvalds out: 11381da177e4SLinus Torvalds return err; 11391da177e4SLinus Torvalds } 11401da177e4SLinus Torvalds 11411da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 11421da177e4SLinus Torvalds /* 11431da177e4SLinus Torvalds * Commit all pending writes to stable storage. 11441da177e4SLinus Torvalds * Strictly speaking, we could sync just the indicated file region here, 11451da177e4SLinus Torvalds * but there's currently no way we can ask the VFS to do so. 11461da177e4SLinus Torvalds * 11471da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 11481da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 11491da177e4SLinus Torvalds */ 11506264d69dSAl Viro __be32 11511da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 11521da177e4SLinus Torvalds loff_t offset, unsigned long count) 11531da177e4SLinus Torvalds { 11541da177e4SLinus Torvalds struct file *file; 11556264d69dSAl Viro __be32 err; 11561da177e4SLinus Torvalds 11571da177e4SLinus Torvalds if ((u64)count > ~(u64)offset) 11581da177e4SLinus Torvalds return nfserr_inval; 11591da177e4SLinus Torvalds 11608837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 11618837abcaSMiklos Szeredi if (err) 11621da177e4SLinus Torvalds return err; 11631da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 11641da177e4SLinus Torvalds if (file->f_op && file->f_op->fsync) { 1165*6a68f89eSChristoph Hellwig err = nfserrno(vfs_fsync(file, file->f_path.dentry, 0)); 11661da177e4SLinus Torvalds } else { 11671da177e4SLinus Torvalds err = nfserr_notsupp; 11681da177e4SLinus Torvalds } 11691da177e4SLinus Torvalds } 11701da177e4SLinus Torvalds 11711da177e4SLinus Torvalds nfsd_close(file); 11721da177e4SLinus Torvalds return err; 11731da177e4SLinus Torvalds } 11741da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 11751da177e4SLinus Torvalds 1176f2b0dee2SAdrian Bunk static __be32 11775c002b3bSJ. Bruce Fields nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, 11785c002b3bSJ. Bruce Fields struct iattr *iap) 11795c002b3bSJ. Bruce Fields { 11805c002b3bSJ. Bruce Fields /* 11815c002b3bSJ. Bruce Fields * Mode has already been set earlier in create: 11825c002b3bSJ. Bruce Fields */ 11835c002b3bSJ. Bruce Fields iap->ia_valid &= ~ATTR_MODE; 11845c002b3bSJ. Bruce Fields /* 11855c002b3bSJ. Bruce Fields * Setting uid/gid works only for root. Irix appears to 11865c002b3bSJ. Bruce Fields * send along the gid on create when it tries to implement 11875c002b3bSJ. Bruce Fields * setgid directories via NFS: 11885c002b3bSJ. Bruce Fields */ 11895cc0a840SDavid Howells if (current_fsuid() != 0) 11905c002b3bSJ. Bruce Fields iap->ia_valid &= ~(ATTR_UID|ATTR_GID); 11915c002b3bSJ. Bruce Fields if (iap->ia_valid) 11925c002b3bSJ. Bruce Fields return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 11935c002b3bSJ. Bruce Fields return 0; 11945c002b3bSJ. Bruce Fields } 11955c002b3bSJ. Bruce Fields 11964ac35c2fSwengang wang /* HPUX client sometimes creates a file in mode 000, and sets size to 0. 11974ac35c2fSwengang wang * setting size to 0 may fail for some specific file systems by the permission 11984ac35c2fSwengang wang * checking which requires WRITE permission but the mode is 000. 11994ac35c2fSwengang wang * we ignore the resizing(to 0) on the just new created file, since the size is 12004ac35c2fSwengang wang * 0 after file created. 12014ac35c2fSwengang wang * 12024ac35c2fSwengang wang * call this only after vfs_create() is called. 12034ac35c2fSwengang wang * */ 12044ac35c2fSwengang wang static void 12054ac35c2fSwengang wang nfsd_check_ignore_resizing(struct iattr *iap) 12064ac35c2fSwengang wang { 12074ac35c2fSwengang wang if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) 12084ac35c2fSwengang wang iap->ia_valid &= ~ATTR_SIZE; 12094ac35c2fSwengang wang } 12104ac35c2fSwengang wang 12111da177e4SLinus Torvalds /* 12121da177e4SLinus Torvalds * Create a file (regular, directory, device, fifo); UNIX sockets 12131da177e4SLinus Torvalds * not yet implemented. 12141da177e4SLinus Torvalds * If the response fh has been verified, the parent directory should 12151da177e4SLinus Torvalds * already be locked. Note that the parent directory is left locked. 12161da177e4SLinus Torvalds * 12171da177e4SLinus Torvalds * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 12181da177e4SLinus Torvalds */ 12196264d69dSAl Viro __be32 12201da177e4SLinus Torvalds nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 12211da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 12221da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 12231da177e4SLinus Torvalds { 12241da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 12251da177e4SLinus Torvalds struct inode *dirp; 12266264d69dSAl Viro __be32 err; 12275c002b3bSJ. Bruce Fields __be32 err2; 12286264d69dSAl Viro int host_err; 12291da177e4SLinus Torvalds 12301da177e4SLinus Torvalds err = nfserr_perm; 12311da177e4SLinus Torvalds if (!flen) 12321da177e4SLinus Torvalds goto out; 12331da177e4SLinus Torvalds err = nfserr_exist; 12341da177e4SLinus Torvalds if (isdotent(fname, flen)) 12351da177e4SLinus Torvalds goto out; 12361da177e4SLinus Torvalds 12378837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 12381da177e4SLinus Torvalds if (err) 12391da177e4SLinus Torvalds goto out; 12401da177e4SLinus Torvalds 12411da177e4SLinus Torvalds dentry = fhp->fh_dentry; 12421da177e4SLinus Torvalds dirp = dentry->d_inode; 12431da177e4SLinus Torvalds 12441da177e4SLinus Torvalds err = nfserr_notdir; 1245acfa4380SAl Viro if (!dirp->i_op->lookup) 12461da177e4SLinus Torvalds goto out; 12471da177e4SLinus Torvalds /* 12481da177e4SLinus Torvalds * Check whether the response file handle has been verified yet. 12491da177e4SLinus Torvalds * If it has, the parent directory should already be locked. 12501da177e4SLinus Torvalds */ 12511da177e4SLinus Torvalds if (!resfhp->fh_dentry) { 12521da177e4SLinus Torvalds /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ 125312fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 12541da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 12556264d69dSAl Viro host_err = PTR_ERR(dchild); 12561da177e4SLinus Torvalds if (IS_ERR(dchild)) 12571da177e4SLinus Torvalds goto out_nfserr; 12581da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 12591da177e4SLinus Torvalds if (err) 12601da177e4SLinus Torvalds goto out; 12611da177e4SLinus Torvalds } else { 12621da177e4SLinus Torvalds /* called from nfsd_proc_create */ 12631da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 12641da177e4SLinus Torvalds if (!fhp->fh_locked) { 12651da177e4SLinus Torvalds /* not actually possible */ 12661da177e4SLinus Torvalds printk(KERN_ERR 12671da177e4SLinus Torvalds "nfsd_create: parent %s/%s not locked!\n", 12681da177e4SLinus Torvalds dentry->d_parent->d_name.name, 12691da177e4SLinus Torvalds dentry->d_name.name); 1270d75f2b9fSAl Viro err = nfserr_io; 12711da177e4SLinus Torvalds goto out; 12721da177e4SLinus Torvalds } 12731da177e4SLinus Torvalds } 12741da177e4SLinus Torvalds /* 12751da177e4SLinus Torvalds * Make sure the child dentry is still negative ... 12761da177e4SLinus Torvalds */ 12771da177e4SLinus Torvalds err = nfserr_exist; 12781da177e4SLinus Torvalds if (dchild->d_inode) { 12791da177e4SLinus Torvalds dprintk("nfsd_create: dentry %s/%s not negative!\n", 12801da177e4SLinus Torvalds dentry->d_name.name, dchild->d_name.name); 12811da177e4SLinus Torvalds goto out; 12821da177e4SLinus Torvalds } 12831da177e4SLinus Torvalds 12841da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 12851da177e4SLinus Torvalds iap->ia_mode = 0; 12861da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 12871da177e4SLinus Torvalds 128807cad1d2SMiklos Szeredi err = nfserr_inval; 128907cad1d2SMiklos Szeredi if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { 129007cad1d2SMiklos Szeredi printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", 129107cad1d2SMiklos Szeredi type); 129207cad1d2SMiklos Szeredi goto out; 129307cad1d2SMiklos Szeredi } 129407cad1d2SMiklos Szeredi 129507cad1d2SMiklos Szeredi host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 129607cad1d2SMiklos Szeredi if (host_err) 129707cad1d2SMiklos Szeredi goto out_nfserr; 129807cad1d2SMiklos Szeredi 12991da177e4SLinus Torvalds /* 13001da177e4SLinus Torvalds * Get the dir op function pointer. 13011da177e4SLinus Torvalds */ 1302088406bcSJ. Bruce Fields err = 0; 13031da177e4SLinus Torvalds switch (type) { 13041da177e4SLinus Torvalds case S_IFREG: 13056264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 13064ac35c2fSwengang wang if (!host_err) 13074ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 13081da177e4SLinus Torvalds break; 13091da177e4SLinus Torvalds case S_IFDIR: 13106264d69dSAl Viro host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); 13111da177e4SLinus Torvalds break; 13121da177e4SLinus Torvalds case S_IFCHR: 13131da177e4SLinus Torvalds case S_IFBLK: 13141da177e4SLinus Torvalds case S_IFIFO: 13151da177e4SLinus Torvalds case S_IFSOCK: 13166264d69dSAl Viro host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 13171da177e4SLinus Torvalds break; 1318463c3197SDave Hansen } 1319463c3197SDave Hansen if (host_err < 0) { 1320463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1321463c3197SDave Hansen goto out_nfserr; 1322463c3197SDave Hansen } 13231da177e4SLinus Torvalds 13241da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 132545bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(dentry)); 13261da177e4SLinus Torvalds write_inode_now(dchild->d_inode, 1); 13271da177e4SLinus Torvalds } 13281da177e4SLinus Torvalds 13295c002b3bSJ. Bruce Fields err2 = nfsd_create_setattr(rqstp, resfhp, iap); 1330f193fbabSYAMAMOTO Takashi if (err2) 1331f193fbabSYAMAMOTO Takashi err = err2; 1332463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 13331da177e4SLinus Torvalds /* 13341da177e4SLinus Torvalds * Update the file handle to get the new inode info. 13351da177e4SLinus Torvalds */ 13361da177e4SLinus Torvalds if (!err) 13371da177e4SLinus Torvalds err = fh_update(resfhp); 13381da177e4SLinus Torvalds out: 13391da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 13401da177e4SLinus Torvalds dput(dchild); 13411da177e4SLinus Torvalds return err; 13421da177e4SLinus Torvalds 13431da177e4SLinus Torvalds out_nfserr: 13446264d69dSAl Viro err = nfserrno(host_err); 13451da177e4SLinus Torvalds goto out; 13461da177e4SLinus Torvalds } 13471da177e4SLinus Torvalds 13481da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 13491da177e4SLinus Torvalds /* 13501da177e4SLinus Torvalds * NFSv3 version of nfsd_create 13511da177e4SLinus Torvalds */ 13526264d69dSAl Viro __be32 13531da177e4SLinus Torvalds nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, 13541da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 13551da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 135681ac95c5SJ. Bruce Fields int *truncp, int *created) 13571da177e4SLinus Torvalds { 13581da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 13591da177e4SLinus Torvalds struct inode *dirp; 13606264d69dSAl Viro __be32 err; 13615c002b3bSJ. Bruce Fields __be32 err2; 13626264d69dSAl Viro int host_err; 13631da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 13641da177e4SLinus Torvalds 13651da177e4SLinus Torvalds err = nfserr_perm; 13661da177e4SLinus Torvalds if (!flen) 13671da177e4SLinus Torvalds goto out; 13681da177e4SLinus Torvalds err = nfserr_exist; 13691da177e4SLinus Torvalds if (isdotent(fname, flen)) 13701da177e4SLinus Torvalds goto out; 13711da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 13721da177e4SLinus Torvalds iap->ia_mode = 0; 13738837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 13741da177e4SLinus Torvalds if (err) 13751da177e4SLinus Torvalds goto out; 13761da177e4SLinus Torvalds 13771da177e4SLinus Torvalds dentry = fhp->fh_dentry; 13781da177e4SLinus Torvalds dirp = dentry->d_inode; 13791da177e4SLinus Torvalds 13801da177e4SLinus Torvalds /* Get all the sanity checks out of the way before 13811da177e4SLinus Torvalds * we lock the parent. */ 13821da177e4SLinus Torvalds err = nfserr_notdir; 1383acfa4380SAl Viro if (!dirp->i_op->lookup) 13841da177e4SLinus Torvalds goto out; 138512fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 13861da177e4SLinus Torvalds 13871da177e4SLinus Torvalds /* 13881da177e4SLinus Torvalds * Compose the response file handle. 13891da177e4SLinus Torvalds */ 13901da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 13916264d69dSAl Viro host_err = PTR_ERR(dchild); 13921da177e4SLinus Torvalds if (IS_ERR(dchild)) 13931da177e4SLinus Torvalds goto out_nfserr; 13941da177e4SLinus Torvalds 13951da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 13961da177e4SLinus Torvalds if (err) 13971da177e4SLinus Torvalds goto out; 13981da177e4SLinus Torvalds 13991da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1400c397852cSPeter Staubach /* solaris7 gets confused (bugid 4218508) if these have 1401749997e5SJeff Layton * the high bit set, so just clear the high bits. If this is 1402749997e5SJeff Layton * ever changed to use different attrs for storing the 1403749997e5SJeff Layton * verifier, then do_open_lookup() will also need to be fixed 1404749997e5SJeff Layton * accordingly. 14051da177e4SLinus Torvalds */ 14061da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 14071da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 14081da177e4SLinus Torvalds } 14091da177e4SLinus Torvalds 1410463c3197SDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 1411463c3197SDave Hansen if (host_err) 1412463c3197SDave Hansen goto out_nfserr; 14131da177e4SLinus Torvalds if (dchild->d_inode) { 14141da177e4SLinus Torvalds err = 0; 14151da177e4SLinus Torvalds 14161da177e4SLinus Torvalds switch (createmode) { 14171da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 14181da177e4SLinus Torvalds if (! S_ISREG(dchild->d_inode->i_mode)) 14191da177e4SLinus Torvalds err = nfserr_exist; 14201da177e4SLinus Torvalds else if (truncp) { 14211da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 14221da177e4SLinus Torvalds * differently. we don't want to truncate the 14231da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 14241da177e4SLinus Torvalds * fails for some other reason. furthermore, 14251da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 14261da177e4SLinus Torvalds * according to spec! 14271da177e4SLinus Torvalds */ 14281da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 14291da177e4SLinus Torvalds } 14301da177e4SLinus Torvalds else { 14311da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 14321da177e4SLinus Torvalds goto set_attr; 14331da177e4SLinus Torvalds } 14341da177e4SLinus Torvalds break; 14351da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 14361da177e4SLinus Torvalds if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 14371da177e4SLinus Torvalds && dchild->d_inode->i_atime.tv_sec == v_atime 14381da177e4SLinus Torvalds && dchild->d_inode->i_size == 0 ) 14391da177e4SLinus Torvalds break; 14401da177e4SLinus Torvalds /* fallthru */ 14411da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 14421da177e4SLinus Torvalds err = nfserr_exist; 14431da177e4SLinus Torvalds } 1444463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14451da177e4SLinus Torvalds goto out; 14461da177e4SLinus Torvalds } 14471da177e4SLinus Torvalds 14486264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 1449463c3197SDave Hansen if (host_err < 0) { 1450463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14511da177e4SLinus Torvalds goto out_nfserr; 1452463c3197SDave Hansen } 145381ac95c5SJ. Bruce Fields if (created) 145481ac95c5SJ. Bruce Fields *created = 1; 14551da177e4SLinus Torvalds 14561da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 145745bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(dentry)); 14581da177e4SLinus Torvalds /* setattr will sync the child (or not) */ 14591da177e4SLinus Torvalds } 14601da177e4SLinus Torvalds 14614ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 14624ac35c2fSwengang wang 14631da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1464c397852cSPeter Staubach /* Cram the verifier into atime/mtime */ 14651da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 1466c397852cSPeter Staubach | ATTR_MTIME_SET|ATTR_ATIME_SET; 14671da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 14681da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 14691da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 14701da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 14711da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 14721da177e4SLinus Torvalds } 14731da177e4SLinus Torvalds 14741da177e4SLinus Torvalds set_attr: 14755c002b3bSJ. Bruce Fields err2 = nfsd_create_setattr(rqstp, resfhp, iap); 1476f193fbabSYAMAMOTO Takashi if (err2) 147745bd3b3dSNeilBrown err = err2; 1478f193fbabSYAMAMOTO Takashi 1479463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1480f193fbabSYAMAMOTO Takashi /* 1481f193fbabSYAMAMOTO Takashi * Update the filehandle to get the new inode info. 1482f193fbabSYAMAMOTO Takashi */ 1483f193fbabSYAMAMOTO Takashi if (!err) 1484f193fbabSYAMAMOTO Takashi err = fh_update(resfhp); 14851da177e4SLinus Torvalds 14861da177e4SLinus Torvalds out: 14871da177e4SLinus Torvalds fh_unlock(fhp); 14881da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 14891da177e4SLinus Torvalds dput(dchild); 14901da177e4SLinus Torvalds return err; 14911da177e4SLinus Torvalds 14921da177e4SLinus Torvalds out_nfserr: 14936264d69dSAl Viro err = nfserrno(host_err); 14941da177e4SLinus Torvalds goto out; 14951da177e4SLinus Torvalds } 14961da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 14971da177e4SLinus Torvalds 14981da177e4SLinus Torvalds /* 14991da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 15001da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 15011da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 15021da177e4SLinus Torvalds */ 15036264d69dSAl Viro __be32 15041da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 15051da177e4SLinus Torvalds { 15061da177e4SLinus Torvalds struct dentry *dentry; 15071da177e4SLinus Torvalds struct inode *inode; 15081da177e4SLinus Torvalds mm_segment_t oldfs; 15096264d69dSAl Viro __be32 err; 15106264d69dSAl Viro int host_err; 15111da177e4SLinus Torvalds 15128837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); 15131da177e4SLinus Torvalds if (err) 15141da177e4SLinus Torvalds goto out; 15151da177e4SLinus Torvalds 15161da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15171da177e4SLinus Torvalds inode = dentry->d_inode; 15181da177e4SLinus Torvalds 15191da177e4SLinus Torvalds err = nfserr_inval; 1520acfa4380SAl Viro if (!inode->i_op->readlink) 15211da177e4SLinus Torvalds goto out; 15221da177e4SLinus Torvalds 152354775491SJan Blunck touch_atime(fhp->fh_export->ex_path.mnt, dentry); 15241da177e4SLinus Torvalds /* N.B. Why does this call need a get_fs()?? 15251da177e4SLinus Torvalds * Remove the set_fs and watch the fireworks:-) --okir 15261da177e4SLinus Torvalds */ 15271da177e4SLinus Torvalds 15281da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 15296264d69dSAl Viro host_err = inode->i_op->readlink(dentry, buf, *lenp); 15301da177e4SLinus Torvalds set_fs(oldfs); 15311da177e4SLinus Torvalds 15326264d69dSAl Viro if (host_err < 0) 15331da177e4SLinus Torvalds goto out_nfserr; 15346264d69dSAl Viro *lenp = host_err; 15351da177e4SLinus Torvalds err = 0; 15361da177e4SLinus Torvalds out: 15371da177e4SLinus Torvalds return err; 15381da177e4SLinus Torvalds 15391da177e4SLinus Torvalds out_nfserr: 15406264d69dSAl Viro err = nfserrno(host_err); 15411da177e4SLinus Torvalds goto out; 15421da177e4SLinus Torvalds } 15431da177e4SLinus Torvalds 15441da177e4SLinus Torvalds /* 15451da177e4SLinus Torvalds * Create a symlink and look up its inode 15461da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 15471da177e4SLinus Torvalds */ 15486264d69dSAl Viro __be32 15491da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 15501da177e4SLinus Torvalds char *fname, int flen, 15511da177e4SLinus Torvalds char *path, int plen, 15521da177e4SLinus Torvalds struct svc_fh *resfhp, 15531da177e4SLinus Torvalds struct iattr *iap) 15541da177e4SLinus Torvalds { 15551da177e4SLinus Torvalds struct dentry *dentry, *dnew; 15566264d69dSAl Viro __be32 err, cerr; 15576264d69dSAl Viro int host_err; 15581da177e4SLinus Torvalds 15591da177e4SLinus Torvalds err = nfserr_noent; 15601da177e4SLinus Torvalds if (!flen || !plen) 15611da177e4SLinus Torvalds goto out; 15621da177e4SLinus Torvalds err = nfserr_exist; 15631da177e4SLinus Torvalds if (isdotent(fname, flen)) 15641da177e4SLinus Torvalds goto out; 15651da177e4SLinus Torvalds 15668837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 15671da177e4SLinus Torvalds if (err) 15681da177e4SLinus Torvalds goto out; 15691da177e4SLinus Torvalds fh_lock(fhp); 15701da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15711da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 15726264d69dSAl Viro host_err = PTR_ERR(dnew); 15731da177e4SLinus Torvalds if (IS_ERR(dnew)) 15741da177e4SLinus Torvalds goto out_nfserr; 15751da177e4SLinus Torvalds 157675c3f29dSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 157775c3f29dSDave Hansen if (host_err) 157875c3f29dSDave Hansen goto out_nfserr; 157975c3f29dSDave Hansen 15801da177e4SLinus Torvalds if (unlikely(path[plen] != 0)) { 15811da177e4SLinus Torvalds char *path_alloced = kmalloc(plen+1, GFP_KERNEL); 15821da177e4SLinus Torvalds if (path_alloced == NULL) 15836264d69dSAl Viro host_err = -ENOMEM; 15841da177e4SLinus Torvalds else { 15851da177e4SLinus Torvalds strncpy(path_alloced, path, plen); 15861da177e4SLinus Torvalds path_alloced[plen] = 0; 1587db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); 15881da177e4SLinus Torvalds kfree(path_alloced); 15891da177e4SLinus Torvalds } 15901da177e4SLinus Torvalds } else 1591db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path); 15921da177e4SLinus Torvalds 15936264d69dSAl Viro if (!host_err) { 15941da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 15956264d69dSAl Viro host_err = nfsd_sync_dir(dentry); 15966264d69dSAl Viro } 15976264d69dSAl Viro err = nfserrno(host_err); 15981da177e4SLinus Torvalds fh_unlock(fhp); 15991da177e4SLinus Torvalds 160075c3f29dSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 160175c3f29dSDave Hansen 16021da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 16031da177e4SLinus Torvalds dput(dnew); 16041da177e4SLinus Torvalds if (err==0) err = cerr; 16051da177e4SLinus Torvalds out: 16061da177e4SLinus Torvalds return err; 16071da177e4SLinus Torvalds 16081da177e4SLinus Torvalds out_nfserr: 16096264d69dSAl Viro err = nfserrno(host_err); 16101da177e4SLinus Torvalds goto out; 16111da177e4SLinus Torvalds } 16121da177e4SLinus Torvalds 16131da177e4SLinus Torvalds /* 16141da177e4SLinus Torvalds * Create a hardlink 16151da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16161da177e4SLinus Torvalds */ 16176264d69dSAl Viro __be32 16181da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 16191da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 16201da177e4SLinus Torvalds { 16211da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 16221da177e4SLinus Torvalds struct inode *dirp, *dest; 16236264d69dSAl Viro __be32 err; 16246264d69dSAl Viro int host_err; 16251da177e4SLinus Torvalds 16268837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); 16271da177e4SLinus Torvalds if (err) 16281da177e4SLinus Torvalds goto out; 16298837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP); 16301da177e4SLinus Torvalds if (err) 16311da177e4SLinus Torvalds goto out; 16321da177e4SLinus Torvalds 16331da177e4SLinus Torvalds err = nfserr_perm; 16341da177e4SLinus Torvalds if (!len) 16351da177e4SLinus Torvalds goto out; 16361da177e4SLinus Torvalds err = nfserr_exist; 16371da177e4SLinus Torvalds if (isdotent(name, len)) 16381da177e4SLinus Torvalds goto out; 16391da177e4SLinus Torvalds 164012fd3520SPeter Zijlstra fh_lock_nested(ffhp, I_MUTEX_PARENT); 16411da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 16421da177e4SLinus Torvalds dirp = ddir->d_inode; 16431da177e4SLinus Torvalds 16441da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 16456264d69dSAl Viro host_err = PTR_ERR(dnew); 16461da177e4SLinus Torvalds if (IS_ERR(dnew)) 16471da177e4SLinus Torvalds goto out_nfserr; 16481da177e4SLinus Torvalds 16491da177e4SLinus Torvalds dold = tfhp->fh_dentry; 16501da177e4SLinus Torvalds dest = dold->d_inode; 16511da177e4SLinus Torvalds 165275c3f29dSDave Hansen host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt); 165375c3f29dSDave Hansen if (host_err) { 165475c3f29dSDave Hansen err = nfserrno(host_err); 165575c3f29dSDave Hansen goto out_dput; 165675c3f29dSDave Hansen } 16576264d69dSAl Viro host_err = vfs_link(dold, dirp, dnew); 16586264d69dSAl Viro if (!host_err) { 16591da177e4SLinus Torvalds if (EX_ISSYNC(ffhp->fh_export)) { 166045bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(ddir)); 16611da177e4SLinus Torvalds write_inode_now(dest, 1); 16621da177e4SLinus Torvalds } 16636264d69dSAl Viro err = 0; 16641da177e4SLinus Torvalds } else { 16656264d69dSAl Viro if (host_err == -EXDEV && rqstp->rq_vers == 2) 16661da177e4SLinus Torvalds err = nfserr_acces; 16671da177e4SLinus Torvalds else 16686264d69dSAl Viro err = nfserrno(host_err); 16691da177e4SLinus Torvalds } 167075c3f29dSDave Hansen mnt_drop_write(tfhp->fh_export->ex_path.mnt); 167175c3f29dSDave Hansen out_dput: 16721da177e4SLinus Torvalds dput(dnew); 1673270d56e5SDavid M. Richter out_unlock: 1674270d56e5SDavid M. Richter fh_unlock(ffhp); 16751da177e4SLinus Torvalds out: 16761da177e4SLinus Torvalds return err; 16771da177e4SLinus Torvalds 16781da177e4SLinus Torvalds out_nfserr: 16796264d69dSAl Viro err = nfserrno(host_err); 1680270d56e5SDavid M. Richter goto out_unlock; 16811da177e4SLinus Torvalds } 16821da177e4SLinus Torvalds 16831da177e4SLinus Torvalds /* 16841da177e4SLinus Torvalds * Rename a file 16851da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16861da177e4SLinus Torvalds */ 16876264d69dSAl Viro __be32 16881da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 16891da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 16901da177e4SLinus Torvalds { 16911da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 16921da177e4SLinus Torvalds struct inode *fdir, *tdir; 16936264d69dSAl Viro __be32 err; 16946264d69dSAl Viro int host_err; 16951da177e4SLinus Torvalds 16968837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); 16971da177e4SLinus Torvalds if (err) 16981da177e4SLinus Torvalds goto out; 16998837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); 17001da177e4SLinus Torvalds if (err) 17011da177e4SLinus Torvalds goto out; 17021da177e4SLinus Torvalds 17031da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 17041da177e4SLinus Torvalds fdir = fdentry->d_inode; 17051da177e4SLinus Torvalds 17061da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 17071da177e4SLinus Torvalds tdir = tdentry->d_inode; 17081da177e4SLinus Torvalds 17091da177e4SLinus Torvalds err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; 1710a56f3937SNeilBrown if (ffhp->fh_export != tfhp->fh_export) 17111da177e4SLinus Torvalds goto out; 17121da177e4SLinus Torvalds 17131da177e4SLinus Torvalds err = nfserr_perm; 17141da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 17151da177e4SLinus Torvalds goto out; 17161da177e4SLinus Torvalds 17171da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 17181da177e4SLinus Torvalds * so do it by hand */ 17191da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 17201da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 1; 17211da177e4SLinus Torvalds fill_pre_wcc(ffhp); 17221da177e4SLinus Torvalds fill_pre_wcc(tfhp); 17231da177e4SLinus Torvalds 17241da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 17256264d69dSAl Viro host_err = PTR_ERR(odentry); 17261da177e4SLinus Torvalds if (IS_ERR(odentry)) 17271da177e4SLinus Torvalds goto out_nfserr; 17281da177e4SLinus Torvalds 17296264d69dSAl Viro host_err = -ENOENT; 17301da177e4SLinus Torvalds if (!odentry->d_inode) 17311da177e4SLinus Torvalds goto out_dput_old; 17326264d69dSAl Viro host_err = -EINVAL; 17331da177e4SLinus Torvalds if (odentry == trap) 17341da177e4SLinus Torvalds goto out_dput_old; 17351da177e4SLinus Torvalds 17361da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 17376264d69dSAl Viro host_err = PTR_ERR(ndentry); 17381da177e4SLinus Torvalds if (IS_ERR(ndentry)) 17391da177e4SLinus Torvalds goto out_dput_old; 17406264d69dSAl Viro host_err = -ENOTEMPTY; 17411da177e4SLinus Torvalds if (ndentry == trap) 17421da177e4SLinus Torvalds goto out_dput_new; 17431da177e4SLinus Torvalds 17449079b1ebSDave Hansen if (svc_msnfs(ffhp) && 17451da177e4SLinus Torvalds ((atomic_read(&odentry->d_count) > 1) 17461da177e4SLinus Torvalds || (atomic_read(&ndentry->d_count) > 1))) { 17476264d69dSAl Viro host_err = -EPERM; 17489079b1ebSDave Hansen goto out_dput_new; 17499079b1ebSDave Hansen } 17509079b1ebSDave Hansen 17519079b1ebSDave Hansen host_err = -EXDEV; 17529079b1ebSDave Hansen if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) 17539079b1ebSDave Hansen goto out_dput_new; 17549079b1ebSDave Hansen host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt); 17559079b1ebSDave Hansen if (host_err) 17569079b1ebSDave Hansen goto out_dput_new; 17579079b1ebSDave Hansen 17586264d69dSAl Viro host_err = vfs_rename(fdir, odentry, tdir, ndentry); 17596264d69dSAl Viro if (!host_err && EX_ISSYNC(tfhp->fh_export)) { 17606264d69dSAl Viro host_err = nfsd_sync_dir(tdentry); 17616264d69dSAl Viro if (!host_err) 17626264d69dSAl Viro host_err = nfsd_sync_dir(fdentry); 17631da177e4SLinus Torvalds } 17641da177e4SLinus Torvalds 17659079b1ebSDave Hansen mnt_drop_write(ffhp->fh_export->ex_path.mnt); 17669079b1ebSDave Hansen 17671da177e4SLinus Torvalds out_dput_new: 17681da177e4SLinus Torvalds dput(ndentry); 17691da177e4SLinus Torvalds out_dput_old: 17701da177e4SLinus Torvalds dput(odentry); 17711da177e4SLinus Torvalds out_nfserr: 17726264d69dSAl Viro err = nfserrno(host_err); 17731da177e4SLinus Torvalds 17741da177e4SLinus Torvalds /* we cannot reply on fh_unlock on the two filehandles, 17751da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 17761da177e4SLinus Torvalds * were the same, so again we do it by hand 17771da177e4SLinus Torvalds */ 17781da177e4SLinus Torvalds fill_post_wcc(ffhp); 17791da177e4SLinus Torvalds fill_post_wcc(tfhp); 17801da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 17811da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 0; 17821da177e4SLinus Torvalds 17831da177e4SLinus Torvalds out: 17841da177e4SLinus Torvalds return err; 17851da177e4SLinus Torvalds } 17861da177e4SLinus Torvalds 17871da177e4SLinus Torvalds /* 17881da177e4SLinus Torvalds * Unlink a file or directory 17891da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 17901da177e4SLinus Torvalds */ 17916264d69dSAl Viro __be32 17921da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 17931da177e4SLinus Torvalds char *fname, int flen) 17941da177e4SLinus Torvalds { 17951da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 17961da177e4SLinus Torvalds struct inode *dirp; 17976264d69dSAl Viro __be32 err; 17986264d69dSAl Viro int host_err; 17991da177e4SLinus Torvalds 18001da177e4SLinus Torvalds err = nfserr_acces; 18011da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 18021da177e4SLinus Torvalds goto out; 18038837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); 18041da177e4SLinus Torvalds if (err) 18051da177e4SLinus Torvalds goto out; 18061da177e4SLinus Torvalds 180712fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 18081da177e4SLinus Torvalds dentry = fhp->fh_dentry; 18091da177e4SLinus Torvalds dirp = dentry->d_inode; 18101da177e4SLinus Torvalds 18111da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 18126264d69dSAl Viro host_err = PTR_ERR(rdentry); 18131da177e4SLinus Torvalds if (IS_ERR(rdentry)) 18141da177e4SLinus Torvalds goto out_nfserr; 18151da177e4SLinus Torvalds 18161da177e4SLinus Torvalds if (!rdentry->d_inode) { 18171da177e4SLinus Torvalds dput(rdentry); 18181da177e4SLinus Torvalds err = nfserr_noent; 18191da177e4SLinus Torvalds goto out; 18201da177e4SLinus Torvalds } 18211da177e4SLinus Torvalds 18221da177e4SLinus Torvalds if (!type) 18231da177e4SLinus Torvalds type = rdentry->d_inode->i_mode & S_IFMT; 18241da177e4SLinus Torvalds 18250622753bSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 18260622753bSDave Hansen if (host_err) 18270622753bSDave Hansen goto out_nfserr; 18280622753bSDave Hansen 18291da177e4SLinus Torvalds if (type != S_IFDIR) { /* It's UNLINK */ 18301da177e4SLinus Torvalds #ifdef MSNFS 18311da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 18321da177e4SLinus Torvalds (atomic_read(&rdentry->d_count) > 1)) { 18336264d69dSAl Viro host_err = -EPERM; 18341da177e4SLinus Torvalds } else 18351da177e4SLinus Torvalds #endif 18366264d69dSAl Viro host_err = vfs_unlink(dirp, rdentry); 18371da177e4SLinus Torvalds } else { /* It's RMDIR */ 18386264d69dSAl Viro host_err = vfs_rmdir(dirp, rdentry); 18391da177e4SLinus Torvalds } 18401da177e4SLinus Torvalds 18411da177e4SLinus Torvalds dput(rdentry); 18421da177e4SLinus Torvalds 18436264d69dSAl Viro if (host_err) 18440622753bSDave Hansen goto out_drop; 18456264d69dSAl Viro if (EX_ISSYNC(fhp->fh_export)) 18466264d69dSAl Viro host_err = nfsd_sync_dir(dentry); 18471da177e4SLinus Torvalds 18480622753bSDave Hansen out_drop: 18490622753bSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 18501da177e4SLinus Torvalds out_nfserr: 18516264d69dSAl Viro err = nfserrno(host_err); 1852f193fbabSYAMAMOTO Takashi out: 1853f193fbabSYAMAMOTO Takashi return err; 18541da177e4SLinus Torvalds } 18551da177e4SLinus Torvalds 18561da177e4SLinus Torvalds /* 185714f7dd63SDavid Woodhouse * We do this buffering because we must not call back into the file 185814f7dd63SDavid Woodhouse * system's ->lookup() method from the filldir callback. That may well 185914f7dd63SDavid Woodhouse * deadlock a number of file systems. 186014f7dd63SDavid Woodhouse * 186114f7dd63SDavid Woodhouse * This is based heavily on the implementation of same in XFS. 186214f7dd63SDavid Woodhouse */ 186314f7dd63SDavid Woodhouse struct buffered_dirent { 186414f7dd63SDavid Woodhouse u64 ino; 186514f7dd63SDavid Woodhouse loff_t offset; 186614f7dd63SDavid Woodhouse int namlen; 186714f7dd63SDavid Woodhouse unsigned int d_type; 186814f7dd63SDavid Woodhouse char name[]; 186914f7dd63SDavid Woodhouse }; 187014f7dd63SDavid Woodhouse 187114f7dd63SDavid Woodhouse struct readdir_data { 187214f7dd63SDavid Woodhouse char *dirent; 187314f7dd63SDavid Woodhouse size_t used; 187453c9c5c0SAl Viro int full; 187514f7dd63SDavid Woodhouse }; 187614f7dd63SDavid Woodhouse 187714f7dd63SDavid Woodhouse static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, 187814f7dd63SDavid Woodhouse loff_t offset, u64 ino, unsigned int d_type) 187914f7dd63SDavid Woodhouse { 188014f7dd63SDavid Woodhouse struct readdir_data *buf = __buf; 188114f7dd63SDavid Woodhouse struct buffered_dirent *de = (void *)(buf->dirent + buf->used); 188214f7dd63SDavid Woodhouse unsigned int reclen; 188314f7dd63SDavid Woodhouse 188414f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); 188553c9c5c0SAl Viro if (buf->used + reclen > PAGE_SIZE) { 188653c9c5c0SAl Viro buf->full = 1; 188714f7dd63SDavid Woodhouse return -EINVAL; 188853c9c5c0SAl Viro } 188914f7dd63SDavid Woodhouse 189014f7dd63SDavid Woodhouse de->namlen = namlen; 189114f7dd63SDavid Woodhouse de->offset = offset; 189214f7dd63SDavid Woodhouse de->ino = ino; 189314f7dd63SDavid Woodhouse de->d_type = d_type; 189414f7dd63SDavid Woodhouse memcpy(de->name, name, namlen); 189514f7dd63SDavid Woodhouse buf->used += reclen; 189614f7dd63SDavid Woodhouse 189714f7dd63SDavid Woodhouse return 0; 189814f7dd63SDavid Woodhouse } 189914f7dd63SDavid Woodhouse 19002f9092e1SDavid Woodhouse static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func, 19012628b766SDavid Woodhouse struct readdir_cd *cdp, loff_t *offsetp) 19022628b766SDavid Woodhouse { 190314f7dd63SDavid Woodhouse struct readdir_data buf; 190414f7dd63SDavid Woodhouse struct buffered_dirent *de; 19052628b766SDavid Woodhouse int host_err; 190614f7dd63SDavid Woodhouse int size; 190714f7dd63SDavid Woodhouse loff_t offset; 19082628b766SDavid Woodhouse 190914f7dd63SDavid Woodhouse buf.dirent = (void *)__get_free_page(GFP_KERNEL); 191014f7dd63SDavid Woodhouse if (!buf.dirent) 19112f9092e1SDavid Woodhouse return nfserrno(-ENOMEM); 191214f7dd63SDavid Woodhouse 191314f7dd63SDavid Woodhouse offset = *offsetp; 19142628b766SDavid Woodhouse 191514f7dd63SDavid Woodhouse while (1) { 19162f9092e1SDavid Woodhouse struct inode *dir_inode = file->f_path.dentry->d_inode; 191714f7dd63SDavid Woodhouse unsigned int reclen; 191814f7dd63SDavid Woodhouse 1919b726e923SDoug Nazar cdp->err = nfserr_eof; /* will be cleared on successful read */ 192014f7dd63SDavid Woodhouse buf.used = 0; 192153c9c5c0SAl Viro buf.full = 0; 192214f7dd63SDavid Woodhouse 192314f7dd63SDavid Woodhouse host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf); 192453c9c5c0SAl Viro if (buf.full) 192553c9c5c0SAl Viro host_err = 0; 192653c9c5c0SAl Viro 192753c9c5c0SAl Viro if (host_err < 0) 192814f7dd63SDavid Woodhouse break; 192914f7dd63SDavid Woodhouse 193014f7dd63SDavid Woodhouse size = buf.used; 193114f7dd63SDavid Woodhouse 193214f7dd63SDavid Woodhouse if (!size) 193314f7dd63SDavid Woodhouse break; 193414f7dd63SDavid Woodhouse 19352f9092e1SDavid Woodhouse /* 19362f9092e1SDavid Woodhouse * Various filldir functions may end up calling back into 19372f9092e1SDavid Woodhouse * lookup_one_len() and the file system's ->lookup() method. 19382f9092e1SDavid Woodhouse * These expect i_mutex to be held, as it would within readdir. 19392f9092e1SDavid Woodhouse */ 19402f9092e1SDavid Woodhouse host_err = mutex_lock_killable(&dir_inode->i_mutex); 19412f9092e1SDavid Woodhouse if (host_err) 19422f9092e1SDavid Woodhouse break; 19432f9092e1SDavid Woodhouse 194414f7dd63SDavid Woodhouse de = (struct buffered_dirent *)buf.dirent; 194514f7dd63SDavid Woodhouse while (size > 0) { 194614f7dd63SDavid Woodhouse offset = de->offset; 194714f7dd63SDavid Woodhouse 194814f7dd63SDavid Woodhouse if (func(cdp, de->name, de->namlen, de->offset, 194914f7dd63SDavid Woodhouse de->ino, de->d_type)) 19502f9092e1SDavid Woodhouse break; 195114f7dd63SDavid Woodhouse 195214f7dd63SDavid Woodhouse if (cdp->err != nfs_ok) 19532f9092e1SDavid Woodhouse break; 195414f7dd63SDavid Woodhouse 195514f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(*de) + de->namlen, 195614f7dd63SDavid Woodhouse sizeof(u64)); 195714f7dd63SDavid Woodhouse size -= reclen; 195814f7dd63SDavid Woodhouse de = (struct buffered_dirent *)((char *)de + reclen); 195914f7dd63SDavid Woodhouse } 19602f9092e1SDavid Woodhouse mutex_unlock(&dir_inode->i_mutex); 19612f9092e1SDavid Woodhouse if (size > 0) /* We bailed out early */ 19622f9092e1SDavid Woodhouse break; 19632f9092e1SDavid Woodhouse 1964c002a6c7SDavid Woodhouse offset = vfs_llseek(file, 0, SEEK_CUR); 196514f7dd63SDavid Woodhouse } 196614f7dd63SDavid Woodhouse 196714f7dd63SDavid Woodhouse free_page((unsigned long)(buf.dirent)); 19682628b766SDavid Woodhouse 19692628b766SDavid Woodhouse if (host_err) 19702628b766SDavid Woodhouse return nfserrno(host_err); 197114f7dd63SDavid Woodhouse 197214f7dd63SDavid Woodhouse *offsetp = offset; 19732628b766SDavid Woodhouse return cdp->err; 19742628b766SDavid Woodhouse } 19752628b766SDavid Woodhouse 19761da177e4SLinus Torvalds /* 19771da177e4SLinus Torvalds * Read entries from a directory. 19781da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 19791da177e4SLinus Torvalds */ 19806264d69dSAl Viro __be32 19811da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 1982a0ad13efSNeilBrown struct readdir_cd *cdp, filldir_t func) 19831da177e4SLinus Torvalds { 19846264d69dSAl Viro __be32 err; 19851da177e4SLinus Torvalds struct file *file; 19861da177e4SLinus Torvalds loff_t offset = *offsetp; 19871da177e4SLinus Torvalds 19888837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file); 19891da177e4SLinus Torvalds if (err) 19901da177e4SLinus Torvalds goto out; 19911da177e4SLinus Torvalds 19921da177e4SLinus Torvalds offset = vfs_llseek(file, offset, 0); 19931da177e4SLinus Torvalds if (offset < 0) { 19941da177e4SLinus Torvalds err = nfserrno((int)offset); 19951da177e4SLinus Torvalds goto out_close; 19961da177e4SLinus Torvalds } 19971da177e4SLinus Torvalds 199814f7dd63SDavid Woodhouse err = nfsd_buffered_readdir(file, func, cdp, offsetp); 19991da177e4SLinus Torvalds 20001da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 20011da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 20021da177e4SLinus Torvalds out_close: 20031da177e4SLinus Torvalds nfsd_close(file); 20041da177e4SLinus Torvalds out: 20051da177e4SLinus Torvalds return err; 20061da177e4SLinus Torvalds } 20071da177e4SLinus Torvalds 20081da177e4SLinus Torvalds /* 20091da177e4SLinus Torvalds * Get file system stats 20101da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 20111da177e4SLinus Torvalds */ 20126264d69dSAl Viro __be32 201304716e66SJ. Bruce Fields nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) 20141da177e4SLinus Torvalds { 201504716e66SJ. Bruce Fields __be32 err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); 2016726c3342SDavid Howells if (!err && vfs_statfs(fhp->fh_dentry,stat)) 20171da177e4SLinus Torvalds err = nfserr_io; 20181da177e4SLinus Torvalds return err; 20191da177e4SLinus Torvalds } 20201da177e4SLinus Torvalds 2021c7d51402SJ. Bruce Fields static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) 2022e22841c6SJ. Bruce Fields { 2023c7d51402SJ. Bruce Fields return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; 2024e22841c6SJ. Bruce Fields } 2025e22841c6SJ. Bruce Fields 20261da177e4SLinus Torvalds /* 20271da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 20281da177e4SLinus Torvalds */ 20296264d69dSAl Viro __be32 20300ec757dfSJ. Bruce Fields nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, 20310ec757dfSJ. Bruce Fields struct dentry *dentry, int acc) 20321da177e4SLinus Torvalds { 20331da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 203414dba533SMimi Zohar struct path path; 20351da177e4SLinus Torvalds int err; 20361da177e4SLinus Torvalds 20378837abcaSMiklos Szeredi if (acc == NFSD_MAY_NOP) 20381da177e4SLinus Torvalds return 0; 20391da177e4SLinus Torvalds #if 0 20401da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 20411da177e4SLinus Torvalds acc, 20428837abcaSMiklos Szeredi (acc & NFSD_MAY_READ)? " read" : "", 20438837abcaSMiklos Szeredi (acc & NFSD_MAY_WRITE)? " write" : "", 20448837abcaSMiklos Szeredi (acc & NFSD_MAY_EXEC)? " exec" : "", 20458837abcaSMiklos Szeredi (acc & NFSD_MAY_SATTR)? " sattr" : "", 20468837abcaSMiklos Szeredi (acc & NFSD_MAY_TRUNC)? " trunc" : "", 20478837abcaSMiklos Szeredi (acc & NFSD_MAY_LOCK)? " lock" : "", 20488837abcaSMiklos Szeredi (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", 20491da177e4SLinus Torvalds inode->i_mode, 20501da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 20511da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 20522c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); 20531da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 20545cc0a840SDavid Howells inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); 20551da177e4SLinus Torvalds #endif 20561da177e4SLinus Torvalds 20571da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 20581da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 20591da177e4SLinus Torvalds * device special file, we ignore rofs. 20601da177e4SLinus Torvalds */ 20618837abcaSMiklos Szeredi if (!(acc & NFSD_MAY_LOCAL_ACCESS)) 20628837abcaSMiklos Szeredi if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { 20632c463e95SDave Hansen if (exp_rdonly(rqstp, exp) || 20642c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)) 20651da177e4SLinus Torvalds return nfserr_rofs; 20668837abcaSMiklos Szeredi if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) 20671da177e4SLinus Torvalds return nfserr_perm; 20681da177e4SLinus Torvalds } 20698837abcaSMiklos Szeredi if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) 20701da177e4SLinus Torvalds return nfserr_perm; 20711da177e4SLinus Torvalds 20728837abcaSMiklos Szeredi if (acc & NFSD_MAY_LOCK) { 20731da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 20741da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 20751da177e4SLinus Torvalds * ownership 20761da177e4SLinus Torvalds */ 20771da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 20781da177e4SLinus Torvalds return 0; 20791da177e4SLinus Torvalds else 20808837abcaSMiklos Szeredi acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; 20811da177e4SLinus Torvalds } 20821da177e4SLinus Torvalds /* 20831da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 20841da177e4SLinus Torvalds * would normally be checked at open time. This is to make 20851da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 20861da177e4SLinus Torvalds * 20871da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 20881da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 20891da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 20901da177e4SLinus Torvalds * always implies file truncation. 20911da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 20921da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 20931da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 20941da177e4SLinus Torvalds * with NFSv3. 20951da177e4SLinus Torvalds */ 20968837abcaSMiklos Szeredi if ((acc & NFSD_MAY_OWNER_OVERRIDE) && 20975cc0a840SDavid Howells inode->i_uid == current_fsuid()) 20981da177e4SLinus Torvalds return 0; 20991da177e4SLinus Torvalds 21008837abcaSMiklos Szeredi /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ 2101f419a2e3SAl Viro err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); 21021da177e4SLinus Torvalds 21031da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 21041da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 21058837abcaSMiklos Szeredi acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE)) 2106f419a2e3SAl Viro err = inode_permission(inode, MAY_EXEC); 210714dba533SMimi Zohar if (err) 210814dba533SMimi Zohar goto nfsd_out; 21091da177e4SLinus Torvalds 211014dba533SMimi Zohar /* Do integrity (permission) checking now, but defer incrementing 211114dba533SMimi Zohar * IMA counts to the actual file open. 211214dba533SMimi Zohar */ 211314dba533SMimi Zohar path.mnt = exp->ex_path.mnt; 211414dba533SMimi Zohar path.dentry = dentry; 21151429b3ecSAl Viro err = ima_path_check(&path, acc & (MAY_READ | MAY_WRITE | MAY_EXEC)); 211614dba533SMimi Zohar nfsd_out: 21171da177e4SLinus Torvalds return err? nfserrno(err) : 0; 21181da177e4SLinus Torvalds } 21191da177e4SLinus Torvalds 21201da177e4SLinus Torvalds void 21211da177e4SLinus Torvalds nfsd_racache_shutdown(void) 21221da177e4SLinus Torvalds { 212354a66e54SJeff Layton struct raparms *raparm, *last_raparm; 212454a66e54SJeff Layton unsigned int i; 212554a66e54SJeff Layton 21261da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 212754a66e54SJeff Layton 212854a66e54SJeff Layton for (i = 0; i < RAPARM_HASH_SIZE; i++) { 212954a66e54SJeff Layton raparm = raparm_hash[i].pb_head; 213054a66e54SJeff Layton while(raparm) { 213154a66e54SJeff Layton last_raparm = raparm; 213254a66e54SJeff Layton raparm = raparm->p_next; 213354a66e54SJeff Layton kfree(last_raparm); 213454a66e54SJeff Layton } 213554a66e54SJeff Layton raparm_hash[i].pb_head = NULL; 213654a66e54SJeff Layton } 21371da177e4SLinus Torvalds } 21381da177e4SLinus Torvalds /* 21391da177e4SLinus Torvalds * Initialize readahead param cache 21401da177e4SLinus Torvalds */ 21411da177e4SLinus Torvalds int 21421da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 21431da177e4SLinus Torvalds { 21441da177e4SLinus Torvalds int i; 2145fce1456aSGreg Banks int j = 0; 2146fce1456aSGreg Banks int nperbucket; 214754a66e54SJeff Layton struct raparms **raparm = NULL; 21481da177e4SLinus Torvalds 2149fce1456aSGreg Banks 215054a66e54SJeff Layton if (raparm_hash[0].pb_head) 21511da177e4SLinus Torvalds return 0; 215254a66e54SJeff Layton nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); 215354a66e54SJeff Layton if (nperbucket < 2) 215454a66e54SJeff Layton nperbucket = 2; 215554a66e54SJeff Layton cache_size = nperbucket * RAPARM_HASH_SIZE; 21564b3bb06bSYan Burman 21574b3bb06bSYan Burman dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); 215854a66e54SJeff Layton 2159fce1456aSGreg Banks for (i = 0; i < RAPARM_HASH_SIZE; i++) { 2160fce1456aSGreg Banks spin_lock_init(&raparm_hash[i].pb_lock); 216154a66e54SJeff Layton 216254a66e54SJeff Layton raparm = &raparm_hash[i].pb_head; 216354a66e54SJeff Layton for (j = 0; j < nperbucket; j++) { 216454a66e54SJeff Layton *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); 216554a66e54SJeff Layton if (!*raparm) 216654a66e54SJeff Layton goto out_nomem; 216754a66e54SJeff Layton raparm = &(*raparm)->p_next; 2168fce1456aSGreg Banks } 216954a66e54SJeff Layton *raparm = NULL; 21701da177e4SLinus Torvalds } 21714b3bb06bSYan Burman 21721da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 21731da177e4SLinus Torvalds return 0; 217454a66e54SJeff Layton 217554a66e54SJeff Layton out_nomem: 217654a66e54SJeff Layton dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); 217754a66e54SJeff Layton nfsd_racache_shutdown(); 217854a66e54SJeff Layton return -ENOMEM; 21791da177e4SLinus Torvalds } 2180a257cdd0SAndreas Gruenbacher 2181a257cdd0SAndreas Gruenbacher #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 2182a257cdd0SAndreas Gruenbacher struct posix_acl * 2183a257cdd0SAndreas Gruenbacher nfsd_get_posix_acl(struct svc_fh *fhp, int type) 2184a257cdd0SAndreas Gruenbacher { 2185a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2186a257cdd0SAndreas Gruenbacher char *name; 2187a257cdd0SAndreas Gruenbacher void *value = NULL; 2188a257cdd0SAndreas Gruenbacher ssize_t size; 2189a257cdd0SAndreas Gruenbacher struct posix_acl *acl; 2190a257cdd0SAndreas Gruenbacher 21915be196e5SChristoph Hellwig if (!IS_POSIXACL(inode)) 2192a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 21935be196e5SChristoph Hellwig 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 ERR_PTR(-EOPNOTSUPP); 2203a257cdd0SAndreas Gruenbacher } 2204a257cdd0SAndreas Gruenbacher 22055be196e5SChristoph Hellwig size = nfsd_getxattr(fhp->fh_dentry, name, &value); 22065be196e5SChristoph Hellwig if (size < 0) 22075be196e5SChristoph Hellwig return ERR_PTR(size); 2208a257cdd0SAndreas Gruenbacher 2209a257cdd0SAndreas Gruenbacher acl = posix_acl_from_xattr(value, size); 2210a257cdd0SAndreas Gruenbacher kfree(value); 2211a257cdd0SAndreas Gruenbacher return acl; 2212a257cdd0SAndreas Gruenbacher } 2213a257cdd0SAndreas Gruenbacher 2214a257cdd0SAndreas Gruenbacher int 2215a257cdd0SAndreas Gruenbacher nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) 2216a257cdd0SAndreas Gruenbacher { 2217a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2218a257cdd0SAndreas Gruenbacher char *name; 2219a257cdd0SAndreas Gruenbacher void *value = NULL; 2220a257cdd0SAndreas Gruenbacher size_t size; 2221a257cdd0SAndreas Gruenbacher int error; 2222a257cdd0SAndreas Gruenbacher 2223acfa4380SAl Viro if (!IS_POSIXACL(inode) || 2224a257cdd0SAndreas Gruenbacher !inode->i_op->setxattr || !inode->i_op->removexattr) 2225a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2226a257cdd0SAndreas Gruenbacher switch(type) { 2227a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2228334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2229a257cdd0SAndreas Gruenbacher break; 2230a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2231334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2232a257cdd0SAndreas Gruenbacher break; 2233a257cdd0SAndreas Gruenbacher default: 2234a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2235a257cdd0SAndreas Gruenbacher } 2236a257cdd0SAndreas Gruenbacher 2237a257cdd0SAndreas Gruenbacher if (acl && acl->a_count) { 2238334a13ecSChristoph Hellwig size = posix_acl_xattr_size(acl->a_count); 2239a257cdd0SAndreas Gruenbacher value = kmalloc(size, GFP_KERNEL); 2240a257cdd0SAndreas Gruenbacher if (!value) 2241a257cdd0SAndreas Gruenbacher return -ENOMEM; 22429ccfc29cSFlorin Malita error = posix_acl_to_xattr(acl, value, size); 22439ccfc29cSFlorin Malita if (error < 0) 2244a257cdd0SAndreas Gruenbacher goto getout; 22459ccfc29cSFlorin Malita size = error; 2246a257cdd0SAndreas Gruenbacher } else 2247a257cdd0SAndreas Gruenbacher size = 0; 2248a257cdd0SAndreas Gruenbacher 224918f335afSDave Hansen error = mnt_want_write(fhp->fh_export->ex_path.mnt); 225018f335afSDave Hansen if (error) 225118f335afSDave Hansen goto getout; 2252a257cdd0SAndreas Gruenbacher if (size) 22535be196e5SChristoph Hellwig error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); 2254a257cdd0SAndreas Gruenbacher else { 2255a257cdd0SAndreas Gruenbacher if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) 2256a257cdd0SAndreas Gruenbacher error = 0; 2257a257cdd0SAndreas Gruenbacher else { 22585be196e5SChristoph Hellwig error = vfs_removexattr(fhp->fh_dentry, name); 2259a257cdd0SAndreas Gruenbacher if (error == -ENODATA) 2260a257cdd0SAndreas Gruenbacher error = 0; 2261a257cdd0SAndreas Gruenbacher } 2262a257cdd0SAndreas Gruenbacher } 226318f335afSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 2264a257cdd0SAndreas Gruenbacher 2265a257cdd0SAndreas Gruenbacher getout: 2266a257cdd0SAndreas Gruenbacher kfree(value); 2267a257cdd0SAndreas Gruenbacher return error; 2268a257cdd0SAndreas Gruenbacher } 2269a257cdd0SAndreas Gruenbacher #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ 2270