11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * File operations used by nfsd. Some of these have been ripped from 31da177e4SLinus Torvalds * other parts of the kernel because they weren't exported, others 41da177e4SLinus Torvalds * are partial duplicates with added or changed functionality. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Note that several functions dget() the dentry upon which they want 71da177e4SLinus Torvalds * to act, most notably those that create directory entries. Response 81da177e4SLinus Torvalds * dentry's are dput()'d if necessary in the release callback. 91da177e4SLinus Torvalds * So if you notice code paths that apparently fail to dput() the 101da177e4SLinus Torvalds * dentry, don't worry--they have been taken care of. 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> 131da177e4SLinus Torvalds * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> 141da177e4SLinus Torvalds */ 151da177e4SLinus Torvalds 161da177e4SLinus Torvalds #include <linux/fs.h> 171da177e4SLinus Torvalds #include <linux/file.h> 18d6b29d7cSJens Axboe #include <linux/splice.h> 191da177e4SLinus Torvalds #include <linux/fcntl.h> 201da177e4SLinus Torvalds #include <linux/namei.h> 211da177e4SLinus Torvalds #include <linux/delay.h> 220eeca283SRobert Love #include <linux/fsnotify.h> 231da177e4SLinus Torvalds #include <linux/posix_acl_xattr.h> 241da177e4SLinus Torvalds #include <linux/xattr.h> 259a74af21SBoaz Harrosh #include <linux/jhash.h> 269a74af21SBoaz Harrosh #include <linux/ima.h> 275a0e3ad6STejun Heo #include <linux/slab.h> 289a74af21SBoaz Harrosh #include <asm/uaccess.h> 29f501912aSBen Myers #include <linux/exportfs.h> 30f501912aSBen Myers #include <linux/writeback.h> 319a74af21SBoaz Harrosh 329a74af21SBoaz Harrosh #ifdef CONFIG_NFSD_V3 339a74af21SBoaz Harrosh #include "xdr3.h" 349a74af21SBoaz Harrosh #endif /* CONFIG_NFSD_V3 */ 359a74af21SBoaz Harrosh 365be196e5SChristoph Hellwig #ifdef CONFIG_NFSD_V4 372ca72e17SJ. Bruce Fields #include "acl.h" 382ca72e17SJ. Bruce Fields #include "idmap.h" 391da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V4 */ 401da177e4SLinus Torvalds 419a74af21SBoaz Harrosh #include "nfsd.h" 429a74af21SBoaz Harrosh #include "vfs.h" 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds #define NFSDDBG_FACILITY NFSDDBG_FILEOP 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds /* 481da177e4SLinus Torvalds * This is a cache of readahead params that help us choose the proper 491da177e4SLinus Torvalds * readahead strategy. Initially, we set all readahead parameters to 0 501da177e4SLinus Torvalds * and let the VFS handle things. 511da177e4SLinus Torvalds * If you increase the number of cached files very much, you'll need to 521da177e4SLinus Torvalds * add a hash table here. 531da177e4SLinus Torvalds */ 541da177e4SLinus Torvalds struct raparms { 551da177e4SLinus Torvalds struct raparms *p_next; 561da177e4SLinus Torvalds unsigned int p_count; 571da177e4SLinus Torvalds ino_t p_ino; 581da177e4SLinus Torvalds dev_t p_dev; 591da177e4SLinus Torvalds int p_set; 601da177e4SLinus Torvalds struct file_ra_state p_ra; 61fce1456aSGreg Banks unsigned int p_hindex; 621da177e4SLinus Torvalds }; 631da177e4SLinus Torvalds 64fce1456aSGreg Banks struct raparm_hbucket { 65fce1456aSGreg Banks struct raparms *pb_head; 66fce1456aSGreg Banks spinlock_t pb_lock; 67fce1456aSGreg Banks } ____cacheline_aligned_in_smp; 68fce1456aSGreg Banks 69fce1456aSGreg Banks #define RAPARM_HASH_BITS 4 70fce1456aSGreg Banks #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) 71fce1456aSGreg Banks #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) 72fce1456aSGreg Banks static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds /* 751da177e4SLinus Torvalds * Called from nfsd_lookup and encode_dirent. Check if we have crossed 761da177e4SLinus Torvalds * a mount point. 77e0bb89efSJ.Bruce Fields * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, 781da177e4SLinus Torvalds * or nfs_ok having possibly changed *dpp and *expp 791da177e4SLinus Torvalds */ 801da177e4SLinus Torvalds int 811da177e4SLinus Torvalds nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 821da177e4SLinus Torvalds struct svc_export **expp) 831da177e4SLinus Torvalds { 841da177e4SLinus Torvalds struct svc_export *exp = *expp, *exp2 = NULL; 851da177e4SLinus Torvalds struct dentry *dentry = *dpp; 8691c9fa8fSAl Viro struct path path = {.mnt = mntget(exp->ex_path.mnt), 8791c9fa8fSAl Viro .dentry = dget(dentry)}; 886264d69dSAl Viro int err = 0; 891da177e4SLinus Torvalds 907cc90cc3SAl Viro err = follow_down(&path); 91cc53ce53SDavid Howells if (err < 0) 92cc53ce53SDavid Howells goto out; 931da177e4SLinus Torvalds 9491c9fa8fSAl Viro exp2 = rqst_exp_get_by_name(rqstp, &path); 951da177e4SLinus Torvalds if (IS_ERR(exp2)) { 961da177e4SLinus Torvalds err = PTR_ERR(exp2); 973b6cee7bSJ. Bruce Fields /* 983b6cee7bSJ. Bruce Fields * We normally allow NFS clients to continue 993b6cee7bSJ. Bruce Fields * "underneath" a mountpoint that is not exported. 1003b6cee7bSJ. Bruce Fields * The exception is V4ROOT, where no traversal is ever 1013b6cee7bSJ. Bruce Fields * allowed without an explicit export of the new 1023b6cee7bSJ. Bruce Fields * directory. 1033b6cee7bSJ. Bruce Fields */ 1043b6cee7bSJ. Bruce Fields if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) 1053b6cee7bSJ. Bruce Fields err = 0; 10691c9fa8fSAl Viro path_put(&path); 1071da177e4SLinus Torvalds goto out; 1081da177e4SLinus Torvalds } 1093c394ddaSSteve Dickson if (nfsd_v4client(rqstp) || 1103c394ddaSSteve Dickson (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { 1111da177e4SLinus Torvalds /* successfully crossed mount point */ 1121644ccc8SAl Viro /* 11391c9fa8fSAl Viro * This is subtle: path.dentry is *not* on path.mnt 11491c9fa8fSAl Viro * at this point. The only reason we are safe is that 11591c9fa8fSAl Viro * original mnt is pinned down by exp, so we should 11691c9fa8fSAl Viro * put path *before* putting exp 1171644ccc8SAl Viro */ 11891c9fa8fSAl Viro *dpp = path.dentry; 11991c9fa8fSAl Viro path.dentry = dentry; 1201644ccc8SAl Viro *expp = exp2; 12191c9fa8fSAl Viro exp2 = exp; 1221da177e4SLinus Torvalds } 12391c9fa8fSAl Viro path_put(&path); 12491c9fa8fSAl Viro exp_put(exp2); 1251da177e4SLinus Torvalds out: 1261da177e4SLinus Torvalds return err; 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 129289ede45SJ. Bruce Fields static void follow_to_parent(struct path *path) 130289ede45SJ. Bruce Fields { 131289ede45SJ. Bruce Fields struct dentry *dp; 132289ede45SJ. Bruce Fields 133289ede45SJ. Bruce Fields while (path->dentry == path->mnt->mnt_root && follow_up(path)) 134289ede45SJ. Bruce Fields ; 135289ede45SJ. Bruce Fields dp = dget_parent(path->dentry); 136289ede45SJ. Bruce Fields dput(path->dentry); 137289ede45SJ. Bruce Fields path->dentry = dp; 138289ede45SJ. Bruce Fields } 139289ede45SJ. Bruce Fields 140289ede45SJ. Bruce Fields static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) 141289ede45SJ. Bruce Fields { 142289ede45SJ. Bruce Fields struct svc_export *exp2; 143289ede45SJ. Bruce Fields struct path path = {.mnt = mntget((*exp)->ex_path.mnt), 144289ede45SJ. Bruce Fields .dentry = dget(dparent)}; 145289ede45SJ. Bruce Fields 146289ede45SJ. Bruce Fields follow_to_parent(&path); 147289ede45SJ. Bruce Fields 148289ede45SJ. Bruce Fields exp2 = rqst_exp_parent(rqstp, &path); 149289ede45SJ. Bruce Fields if (PTR_ERR(exp2) == -ENOENT) { 150289ede45SJ. Bruce Fields *dentryp = dget(dparent); 151289ede45SJ. Bruce Fields } else if (IS_ERR(exp2)) { 152289ede45SJ. Bruce Fields path_put(&path); 153289ede45SJ. Bruce Fields return PTR_ERR(exp2); 154289ede45SJ. Bruce Fields } else { 155289ede45SJ. Bruce Fields *dentryp = dget(path.dentry); 156289ede45SJ. Bruce Fields exp_put(*exp); 157289ede45SJ. Bruce Fields *exp = exp2; 158289ede45SJ. Bruce Fields } 159289ede45SJ. Bruce Fields path_put(&path); 160289ede45SJ. Bruce Fields return 0; 161289ede45SJ. Bruce Fields } 162289ede45SJ. Bruce Fields 16382ead7feSJ. Bruce Fields /* 16482ead7feSJ. Bruce Fields * For nfsd purposes, we treat V4ROOT exports as though there was an 16582ead7feSJ. Bruce Fields * export at *every* directory. 16682ead7feSJ. Bruce Fields */ 1673227fa41SJ. Bruce Fields int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) 16882ead7feSJ. Bruce Fields { 16982ead7feSJ. Bruce Fields if (d_mountpoint(dentry)) 17082ead7feSJ. Bruce Fields return 1; 171*11fcee02STrond Myklebust if (nfsd4_is_junction(dentry)) 172*11fcee02STrond Myklebust return 1; 17382ead7feSJ. Bruce Fields if (!(exp->ex_flags & NFSEXP_V4ROOT)) 17482ead7feSJ. Bruce Fields return 0; 17582ead7feSJ. Bruce Fields return dentry->d_inode != NULL; 17682ead7feSJ. Bruce Fields } 17782ead7feSJ. Bruce Fields 1786264d69dSAl Viro __be32 1796c0a654dSJ. Bruce Fields nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, 1805a022fc8SChuck Lever const char *name, unsigned int len, 1816c0a654dSJ. Bruce Fields struct svc_export **exp_ret, struct dentry **dentry_ret) 1821da177e4SLinus Torvalds { 1831da177e4SLinus Torvalds struct svc_export *exp; 1841da177e4SLinus Torvalds struct dentry *dparent; 1851da177e4SLinus Torvalds struct dentry *dentry; 1866264d69dSAl Viro int host_err; 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds dparent = fhp->fh_dentry; 1911da177e4SLinus Torvalds exp = fhp->fh_export; 1921da177e4SLinus Torvalds exp_get(exp); 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds /* Lookup the name, but don't follow links */ 1951da177e4SLinus Torvalds if (isdotent(name, len)) { 1961da177e4SLinus Torvalds if (len==1) 1971da177e4SLinus Torvalds dentry = dget(dparent); 19854775491SJan Blunck else if (dparent != exp->ex_path.dentry) 1991da177e4SLinus Torvalds dentry = dget_parent(dparent); 200fed83811SJ. Bruce Fields else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) 2011da177e4SLinus Torvalds dentry = dget(dparent); /* .. == . just like at / */ 2021da177e4SLinus Torvalds else { 2031da177e4SLinus Torvalds /* checking mountpoint crossing is very different when stepping up */ 204289ede45SJ. Bruce Fields host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); 205289ede45SJ. Bruce Fields if (host_err) 2061da177e4SLinus Torvalds goto out_nfserr; 2071da177e4SLinus Torvalds } 2081da177e4SLinus Torvalds } else { 2091da177e4SLinus Torvalds fh_lock(fhp); 2101da177e4SLinus Torvalds dentry = lookup_one_len(name, dparent, len); 2116264d69dSAl Viro host_err = PTR_ERR(dentry); 2121da177e4SLinus Torvalds if (IS_ERR(dentry)) 2131da177e4SLinus Torvalds goto out_nfserr; 2141da177e4SLinus Torvalds /* 2151da177e4SLinus Torvalds * check if we have crossed a mount point ... 2161da177e4SLinus Torvalds */ 21782ead7feSJ. Bruce Fields if (nfsd_mountpoint(dentry, exp)) { 2186264d69dSAl Viro if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 2191da177e4SLinus Torvalds dput(dentry); 2201da177e4SLinus Torvalds goto out_nfserr; 2211da177e4SLinus Torvalds } 2221da177e4SLinus Torvalds } 2231da177e4SLinus Torvalds } 2246c0a654dSJ. Bruce Fields *dentry_ret = dentry; 2256c0a654dSJ. Bruce Fields *exp_ret = exp; 2266c0a654dSJ. Bruce Fields return 0; 2276c0a654dSJ. Bruce Fields 2286c0a654dSJ. Bruce Fields out_nfserr: 2296c0a654dSJ. Bruce Fields exp_put(exp); 2306c0a654dSJ. Bruce Fields return nfserrno(host_err); 2316c0a654dSJ. Bruce Fields } 2326c0a654dSJ. Bruce Fields 2336c0a654dSJ. Bruce Fields /* 2346c0a654dSJ. Bruce Fields * Look up one component of a pathname. 2356c0a654dSJ. Bruce Fields * N.B. After this call _both_ fhp and resfh need an fh_put 2366c0a654dSJ. Bruce Fields * 2376c0a654dSJ. Bruce Fields * If the lookup would cross a mountpoint, and the mounted filesystem 2386c0a654dSJ. Bruce Fields * is exported to the client with NFSEXP_NOHIDE, then the lookup is 2396c0a654dSJ. Bruce Fields * accepted as it stands and the mounted directory is 2406c0a654dSJ. Bruce Fields * returned. Otherwise the covered directory is returned. 2416c0a654dSJ. Bruce Fields * NOTE: this mountpoint crossing is not supported properly by all 2426c0a654dSJ. Bruce Fields * clients and is explicitly disallowed for NFSv3 2436c0a654dSJ. Bruce Fields * NeilBrown <neilb@cse.unsw.edu.au> 2446c0a654dSJ. Bruce Fields */ 2456c0a654dSJ. Bruce Fields __be32 2466c0a654dSJ. Bruce Fields nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 2475a022fc8SChuck Lever unsigned int len, struct svc_fh *resfh) 2486c0a654dSJ. Bruce Fields { 2496c0a654dSJ. Bruce Fields struct svc_export *exp; 2506c0a654dSJ. Bruce Fields struct dentry *dentry; 2516c0a654dSJ. Bruce Fields __be32 err; 2526c0a654dSJ. Bruce Fields 25329a78a3eSJ. Bruce Fields err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 25429a78a3eSJ. Bruce Fields if (err) 25529a78a3eSJ. Bruce Fields return err; 2566c0a654dSJ. Bruce Fields err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); 2576c0a654dSJ. Bruce Fields if (err) 2586c0a654dSJ. Bruce Fields return err; 25932c1eb0cSAndy Adamson err = check_nfsd_access(exp, rqstp); 26032c1eb0cSAndy Adamson if (err) 26132c1eb0cSAndy Adamson goto out; 2621da177e4SLinus Torvalds /* 2631da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2641da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2651da177e4SLinus Torvalds */ 2661da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2671da177e4SLinus Torvalds if (!err && !dentry->d_inode) 2681da177e4SLinus Torvalds err = nfserr_noent; 26932c1eb0cSAndy Adamson out: 2701da177e4SLinus Torvalds dput(dentry); 2711da177e4SLinus Torvalds exp_put(exp); 2721da177e4SLinus Torvalds return err; 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds 2754795bb37SJ. Bruce Fields static int nfsd_break_lease(struct inode *inode) 2764795bb37SJ. Bruce Fields { 2774795bb37SJ. Bruce Fields if (!S_ISREG(inode->i_mode)) 2784795bb37SJ. Bruce Fields return 0; 2794795bb37SJ. Bruce Fields return break_lease(inode, O_WRONLY | O_NONBLOCK); 2804795bb37SJ. Bruce Fields } 2814795bb37SJ. Bruce Fields 282f501912aSBen Myers /* 283f501912aSBen Myers * Commit metadata changes to stable storage. 284f501912aSBen Myers */ 285f501912aSBen Myers static int 286f501912aSBen Myers commit_metadata(struct svc_fh *fhp) 287f501912aSBen Myers { 288f501912aSBen Myers struct inode *inode = fhp->fh_dentry->d_inode; 289f501912aSBen Myers const struct export_operations *export_ops = inode->i_sb->s_export_op; 290f501912aSBen Myers 291f501912aSBen Myers if (!EX_ISSYNC(fhp->fh_export)) 292f501912aSBen Myers return 0; 293f501912aSBen Myers 294c3765016SChristoph Hellwig if (export_ops->commit_metadata) 295c3765016SChristoph Hellwig return export_ops->commit_metadata(inode); 296c3765016SChristoph Hellwig return sync_inode_metadata(inode, 1); 297f501912aSBen Myers } 2986c0a654dSJ. Bruce Fields 2991da177e4SLinus Torvalds /* 3001da177e4SLinus Torvalds * Set various file attributes. 3011da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 3021da177e4SLinus Torvalds */ 3036264d69dSAl Viro __be32 3041da177e4SLinus Torvalds nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 3051da177e4SLinus Torvalds int check_guard, time_t guardtime) 3061da177e4SLinus Torvalds { 3071da177e4SLinus Torvalds struct dentry *dentry; 3081da177e4SLinus Torvalds struct inode *inode; 3098837abcaSMiklos Szeredi int accmode = NFSD_MAY_SATTR; 3101da177e4SLinus Torvalds int ftype = 0; 3116264d69dSAl Viro __be32 err; 3126264d69dSAl Viro int host_err; 3131da177e4SLinus Torvalds int size_change = 0; 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) 3168837abcaSMiklos Szeredi accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; 3171da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) 3181da177e4SLinus Torvalds ftype = S_IFREG; 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds /* Get inode */ 3211da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 32215b7a1b8SNeilBrown if (err) 3231da177e4SLinus Torvalds goto out; 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds dentry = fhp->fh_dentry; 3261da177e4SLinus Torvalds inode = dentry->d_inode; 3271da177e4SLinus Torvalds 32815b7a1b8SNeilBrown /* Ignore any mode updates on symlinks */ 32915b7a1b8SNeilBrown if (S_ISLNK(inode->i_mode)) 33015b7a1b8SNeilBrown iap->ia_valid &= ~ATTR_MODE; 33115b7a1b8SNeilBrown 33215b7a1b8SNeilBrown if (!iap->ia_valid) 33315b7a1b8SNeilBrown goto out; 33415b7a1b8SNeilBrown 3359c85fca5SChristoph Hellwig /* 3369c85fca5SChristoph Hellwig * NFSv2 does not differentiate between "set-[ac]time-to-now" 3371da177e4SLinus Torvalds * which only requires access, and "set-[ac]time-to-X" which 3381da177e4SLinus Torvalds * requires ownership. 3391da177e4SLinus Torvalds * So if it looks like it might be "set both to the same time which 3401da177e4SLinus Torvalds * is close to now", and if inode_change_ok fails, then we 3411da177e4SLinus Torvalds * convert to "set to now" instead of "set to explicit time" 3421da177e4SLinus Torvalds * 3431da177e4SLinus Torvalds * We only call inode_change_ok as the last test as technically 3441da177e4SLinus Torvalds * it is not an interface that we should be using. It is only 3451da177e4SLinus Torvalds * valid if the filesystem does not define it's own i_op->setattr. 3461da177e4SLinus Torvalds */ 3471da177e4SLinus Torvalds #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) 3481da177e4SLinus Torvalds #define MAX_TOUCH_TIME_ERROR (30*60) 3499c85fca5SChristoph Hellwig if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && 3509c85fca5SChristoph Hellwig iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { 3519c85fca5SChristoph Hellwig /* 3529c85fca5SChristoph Hellwig * Looks probable. 3539c85fca5SChristoph Hellwig * 3549c85fca5SChristoph Hellwig * Now just make sure time is in the right ballpark. 3559c85fca5SChristoph Hellwig * Solaris, at least, doesn't seem to care what the time 3569c85fca5SChristoph Hellwig * request is. We require it be within 30 minutes of now. 3571da177e4SLinus Torvalds */ 3581da177e4SLinus Torvalds time_t delta = iap->ia_atime.tv_sec - get_seconds(); 3599c85fca5SChristoph Hellwig if (delta < 0) 3609c85fca5SChristoph Hellwig delta = -delta; 3611da177e4SLinus Torvalds if (delta < MAX_TOUCH_TIME_ERROR && 3621da177e4SLinus Torvalds inode_change_ok(inode, iap) != 0) { 3639c85fca5SChristoph Hellwig /* 3649c85fca5SChristoph Hellwig * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. 3659c85fca5SChristoph Hellwig * This will cause notify_change to set these times 3669c85fca5SChristoph Hellwig * to "now" 3671da177e4SLinus Torvalds */ 3681da177e4SLinus Torvalds iap->ia_valid &= ~BOTH_TIME_SET; 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds 3729c85fca5SChristoph Hellwig /* 3739c85fca5SChristoph Hellwig * The size case is special. 3749c85fca5SChristoph Hellwig * It changes the file as well as the attributes. 3759c85fca5SChristoph Hellwig */ 3761da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) { 3771da177e4SLinus Torvalds if (iap->ia_size < inode->i_size) { 3788837abcaSMiklos Szeredi err = nfsd_permission(rqstp, fhp->fh_export, dentry, 3798837abcaSMiklos Szeredi NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE); 3801da177e4SLinus Torvalds if (err) 3811da177e4SLinus Torvalds goto out; 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 3846264d69dSAl Viro host_err = get_write_access(inode); 3856264d69dSAl Viro if (host_err) 3861da177e4SLinus Torvalds goto out_nfserr; 3871da177e4SLinus Torvalds 3881da177e4SLinus Torvalds size_change = 1; 3896264d69dSAl Viro host_err = locks_verify_truncate(inode, NULL, iap->ia_size); 3906264d69dSAl Viro if (host_err) { 3911da177e4SLinus Torvalds put_write_access(inode); 3921da177e4SLinus Torvalds goto out_nfserr; 3931da177e4SLinus Torvalds } 3941da177e4SLinus Torvalds } 3951da177e4SLinus Torvalds 396ca456252SJeff Layton /* sanitize the mode change */ 3971da177e4SLinus Torvalds if (iap->ia_valid & ATTR_MODE) { 3981da177e4SLinus Torvalds iap->ia_mode &= S_IALLUGO; 399dee3209dSJeff Layton iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); 4001da177e4SLinus Torvalds } 401ca456252SJeff Layton 402ca456252SJeff Layton /* Revoke setuid/setgid on chown */ 4030953e620SSachin S. Prabhu if (!S_ISDIR(inode->i_mode) && 4040953e620SSachin S. Prabhu (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) || 4050953e620SSachin S. Prabhu ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) { 406ca456252SJeff Layton iap->ia_valid |= ATTR_KILL_PRIV; 407ca456252SJeff Layton if (iap->ia_valid & ATTR_MODE) { 408ca456252SJeff Layton /* we're setting mode too, just clear the s*id bits */ 409ca456252SJeff Layton iap->ia_mode &= ~S_ISUID; 410ca456252SJeff Layton if (iap->ia_mode & S_IXGRP) 4118a0ce7d9SJeff Layton iap->ia_mode &= ~S_ISGID; 4128a0ce7d9SJeff Layton } else { 413ca456252SJeff Layton /* set ATTR_KILL_* bits and let VFS handle it */ 414ca456252SJeff Layton iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); 415ca456252SJeff Layton } 4168a0ce7d9SJeff Layton } 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds /* Change the attributes. */ 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds err = nfserr_notsync; 4231da177e4SLinus Torvalds if (!check_guard || guardtime == inode->i_ctime.tv_sec) { 4244795bb37SJ. Bruce Fields host_err = nfsd_break_lease(inode); 4256a76bebeSJ. Bruce Fields if (host_err) 4266a76bebeSJ. Bruce Fields goto out_nfserr; 4271da177e4SLinus Torvalds fh_lock(fhp); 4286a76bebeSJ. Bruce Fields 4296264d69dSAl Viro host_err = notify_change(dentry, iap); 4306264d69dSAl Viro err = nfserrno(host_err); 4311da177e4SLinus Torvalds fh_unlock(fhp); 4321da177e4SLinus Torvalds } 4331da177e4SLinus Torvalds if (size_change) 4341da177e4SLinus Torvalds put_write_access(inode); 4351da177e4SLinus Torvalds if (!err) 436b160fdabSChristoph Hellwig commit_metadata(fhp); 4371da177e4SLinus Torvalds out: 4381da177e4SLinus Torvalds return err; 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds out_nfserr: 4416264d69dSAl Viro err = nfserrno(host_err); 4421da177e4SLinus Torvalds goto out; 4431da177e4SLinus Torvalds } 4441da177e4SLinus Torvalds 4455be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V2_ACL) || \ 4465be196e5SChristoph Hellwig defined(CONFIG_NFSD_V3_ACL) || \ 4475be196e5SChristoph Hellwig defined(CONFIG_NFSD_V4) 4485be196e5SChristoph Hellwig static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) 4495be196e5SChristoph Hellwig { 4505be196e5SChristoph Hellwig ssize_t buflen; 4516c6a426fSKrishna Kumar ssize_t ret; 4521da177e4SLinus Torvalds 4535be196e5SChristoph Hellwig buflen = vfs_getxattr(dentry, key, NULL, 0); 4545be196e5SChristoph Hellwig if (buflen <= 0) 4555be196e5SChristoph Hellwig return buflen; 4565be196e5SChristoph Hellwig 4575be196e5SChristoph Hellwig *buf = kmalloc(buflen, GFP_KERNEL); 4585be196e5SChristoph Hellwig if (!*buf) 4595be196e5SChristoph Hellwig return -ENOMEM; 4605be196e5SChristoph Hellwig 4616c6a426fSKrishna Kumar ret = vfs_getxattr(dentry, key, *buf, buflen); 4626c6a426fSKrishna Kumar if (ret < 0) 4636c6a426fSKrishna Kumar kfree(*buf); 4646c6a426fSKrishna Kumar return ret; 4655be196e5SChristoph Hellwig } 4665be196e5SChristoph Hellwig #endif 4675be196e5SChristoph Hellwig 4685be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V4) 4691da177e4SLinus Torvalds static int 4701da177e4SLinus Torvalds set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) 4711da177e4SLinus Torvalds { 4721da177e4SLinus Torvalds int len; 4731da177e4SLinus Torvalds size_t buflen; 4741da177e4SLinus Torvalds char *buf = NULL; 4751da177e4SLinus Torvalds int error = 0; 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds buflen = posix_acl_xattr_size(pacl->a_count); 4781da177e4SLinus Torvalds buf = kmalloc(buflen, GFP_KERNEL); 4791da177e4SLinus Torvalds error = -ENOMEM; 4801da177e4SLinus Torvalds if (buf == NULL) 4811da177e4SLinus Torvalds goto out; 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds len = posix_acl_to_xattr(pacl, buf, buflen); 4841da177e4SLinus Torvalds if (len < 0) { 4851da177e4SLinus Torvalds error = len; 4861da177e4SLinus Torvalds goto out; 4871da177e4SLinus Torvalds } 4881da177e4SLinus Torvalds 4895be196e5SChristoph Hellwig error = vfs_setxattr(dentry, key, buf, len, 0); 4901da177e4SLinus Torvalds out: 4911da177e4SLinus Torvalds kfree(buf); 4921da177e4SLinus Torvalds return error; 4931da177e4SLinus Torvalds } 4941da177e4SLinus Torvalds 4956264d69dSAl Viro __be32 4961da177e4SLinus Torvalds nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, 4971da177e4SLinus Torvalds struct nfs4_acl *acl) 4981da177e4SLinus Torvalds { 4996264d69dSAl Viro __be32 error; 5006264d69dSAl Viro int host_error; 5011da177e4SLinus Torvalds struct dentry *dentry; 5021da177e4SLinus Torvalds struct inode *inode; 5031da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 5041da177e4SLinus Torvalds unsigned int flags = 0; 5051da177e4SLinus Torvalds 5061da177e4SLinus Torvalds /* Get inode */ 507e281d810SJ. Bruce Fields error = fh_verify(rqstp, fhp, 0, NFSD_MAY_SATTR); 5081da177e4SLinus Torvalds if (error) 5094b2ca38aSJ. Bruce Fields return error; 5101da177e4SLinus Torvalds 5111da177e4SLinus Torvalds dentry = fhp->fh_dentry; 5121da177e4SLinus Torvalds inode = dentry->d_inode; 5131da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) 5141da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5151da177e4SLinus Torvalds 5166264d69dSAl Viro host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); 5176264d69dSAl Viro if (host_error == -EINVAL) { 5184b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 5196264d69dSAl Viro } else if (host_error < 0) 5201da177e4SLinus Torvalds goto out_nfserr; 5211da177e4SLinus Torvalds 5226264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); 5236264d69dSAl Viro if (host_error < 0) 5244b2ca38aSJ. Bruce Fields goto out_release; 5251da177e4SLinus Torvalds 5264b2ca38aSJ. Bruce Fields if (S_ISDIR(inode->i_mode)) 5276264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); 5281da177e4SLinus Torvalds 5294b2ca38aSJ. Bruce Fields out_release: 5301da177e4SLinus Torvalds posix_acl_release(pacl); 5311da177e4SLinus Torvalds posix_acl_release(dpacl); 5321da177e4SLinus Torvalds out_nfserr: 533f34f9242SJ. Bruce Fields if (host_error == -EOPNOTSUPP) 5344b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 535f34f9242SJ. Bruce Fields else 5364b2ca38aSJ. Bruce Fields return nfserrno(host_error); 5371da177e4SLinus Torvalds } 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds static struct posix_acl * 5401da177e4SLinus Torvalds _get_posix_acl(struct dentry *dentry, char *key) 5411da177e4SLinus Torvalds { 5425be196e5SChristoph Hellwig void *buf = NULL; 5431da177e4SLinus Torvalds struct posix_acl *pacl = NULL; 5445be196e5SChristoph Hellwig int buflen; 5451da177e4SLinus Torvalds 5465be196e5SChristoph Hellwig buflen = nfsd_getxattr(dentry, key, &buf); 5475be196e5SChristoph Hellwig if (!buflen) 5485be196e5SChristoph Hellwig buflen = -ENODATA; 5495be196e5SChristoph Hellwig if (buflen <= 0) 5505be196e5SChristoph Hellwig return ERR_PTR(buflen); 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds pacl = posix_acl_from_xattr(buf, buflen); 5531da177e4SLinus Torvalds kfree(buf); 5541da177e4SLinus Torvalds return pacl; 5551da177e4SLinus Torvalds } 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds int 5581da177e4SLinus Torvalds nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) 5591da177e4SLinus Torvalds { 5601da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 5611da177e4SLinus Torvalds int error = 0; 5621da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 5631da177e4SLinus Torvalds unsigned int flags = 0; 5641da177e4SLinus Torvalds 5659a59f452SChristoph Hellwig pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); 5661da177e4SLinus Torvalds if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) 5671da177e4SLinus Torvalds pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 5681da177e4SLinus Torvalds if (IS_ERR(pacl)) { 5691da177e4SLinus Torvalds error = PTR_ERR(pacl); 5701da177e4SLinus Torvalds pacl = NULL; 5711da177e4SLinus Torvalds goto out; 5721da177e4SLinus Torvalds } 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) { 5759a59f452SChristoph Hellwig dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); 5761da177e4SLinus Torvalds if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) 5771da177e4SLinus Torvalds dpacl = NULL; 5781da177e4SLinus Torvalds else if (IS_ERR(dpacl)) { 5791da177e4SLinus Torvalds error = PTR_ERR(dpacl); 5801da177e4SLinus Torvalds dpacl = NULL; 5811da177e4SLinus Torvalds goto out; 5821da177e4SLinus Torvalds } 5831da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5841da177e4SLinus Torvalds } 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); 5871da177e4SLinus Torvalds if (IS_ERR(*acl)) { 5881da177e4SLinus Torvalds error = PTR_ERR(*acl); 5891da177e4SLinus Torvalds *acl = NULL; 5901da177e4SLinus Torvalds } 5911da177e4SLinus Torvalds out: 5921da177e4SLinus Torvalds posix_acl_release(pacl); 5931da177e4SLinus Torvalds posix_acl_release(dpacl); 5941da177e4SLinus Torvalds return error; 5951da177e4SLinus Torvalds } 5961da177e4SLinus Torvalds 597*11fcee02STrond Myklebust #define NFSD_XATTR_JUNCTION_PREFIX XATTR_TRUSTED_PREFIX "junction." 598*11fcee02STrond Myklebust #define NFSD_XATTR_JUNCTION_TYPE NFSD_XATTR_JUNCTION_PREFIX "type" 599*11fcee02STrond Myklebust int nfsd4_is_junction(struct dentry *dentry) 600*11fcee02STrond Myklebust { 601*11fcee02STrond Myklebust struct inode *inode = dentry->d_inode; 602*11fcee02STrond Myklebust 603*11fcee02STrond Myklebust if (inode == NULL) 604*11fcee02STrond Myklebust return 0; 605*11fcee02STrond Myklebust if (inode->i_mode & S_IXUGO) 606*11fcee02STrond Myklebust return 0; 607*11fcee02STrond Myklebust if (!(inode->i_mode & S_ISVTX)) 608*11fcee02STrond Myklebust return 0; 609*11fcee02STrond Myklebust if (vfs_getxattr(dentry, NFSD_XATTR_JUNCTION_TYPE, NULL, 0) <= 0) 610*11fcee02STrond Myklebust return 0; 611*11fcee02STrond Myklebust return 1; 612*11fcee02STrond Myklebust } 6136a85d6c7SJ. Bruce Fields #endif /* defined(CONFIG_NFSD_V4) */ 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 6161da177e4SLinus Torvalds /* 6171da177e4SLinus Torvalds * Check server access rights to a file system object 6181da177e4SLinus Torvalds */ 6191da177e4SLinus Torvalds struct accessmap { 6201da177e4SLinus Torvalds u32 access; 6211da177e4SLinus Torvalds int how; 6221da177e4SLinus Torvalds }; 6231da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 6248837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6258837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6268837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, 6278837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds { 0, 0 } 6301da177e4SLinus Torvalds }; 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 6338837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6348837abcaSMiklos Szeredi { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, 6358837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, 6368837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, 6378837abcaSMiklos Szeredi { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, 6381da177e4SLinus Torvalds 6391da177e4SLinus Torvalds { 0, 0 } 6401da177e4SLinus Torvalds }; 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 6431da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 6441da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 6451da177e4SLinus Torvalds * (which really, the server doesn't care about). So 6461da177e4SLinus Torvalds * We provide simple access checking for them, looking 6471da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 6481da177e4SLinus Torvalds * filesystem checks 6491da177e4SLinus Torvalds */ 6508837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6518837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6528837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6538837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds { 0, 0 } 6561da177e4SLinus Torvalds }; 6571da177e4SLinus Torvalds 6586264d69dSAl Viro __be32 6591da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 6601da177e4SLinus Torvalds { 6611da177e4SLinus Torvalds struct accessmap *map; 6621da177e4SLinus Torvalds struct svc_export *export; 6631da177e4SLinus Torvalds struct dentry *dentry; 6641da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 6656264d69dSAl Viro __be32 error; 6661da177e4SLinus Torvalds 6678837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 6681da177e4SLinus Torvalds if (error) 6691da177e4SLinus Torvalds goto out; 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds export = fhp->fh_export; 6721da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds if (S_ISREG(dentry->d_inode->i_mode)) 6751da177e4SLinus Torvalds map = nfs3_regaccess; 6761da177e4SLinus Torvalds else if (S_ISDIR(dentry->d_inode->i_mode)) 6771da177e4SLinus Torvalds map = nfs3_diraccess; 6781da177e4SLinus Torvalds else 6791da177e4SLinus Torvalds map = nfs3_anyaccess; 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds query = *access; 6831da177e4SLinus Torvalds for (; map->access; map++) { 6841da177e4SLinus Torvalds if (map->access & query) { 6856264d69dSAl Viro __be32 err2; 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds sresult |= map->access; 6881da177e4SLinus Torvalds 6890ec757dfSJ. Bruce Fields err2 = nfsd_permission(rqstp, export, dentry, map->how); 6901da177e4SLinus Torvalds switch (err2) { 6911da177e4SLinus Torvalds case nfs_ok: 6921da177e4SLinus Torvalds result |= map->access; 6931da177e4SLinus Torvalds break; 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 6961da177e4SLinus Torvalds * rather than an error occurred */ 6971da177e4SLinus Torvalds case nfserr_rofs: 6981da177e4SLinus Torvalds case nfserr_acces: 6991da177e4SLinus Torvalds case nfserr_perm: 7001da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 7011da177e4SLinus Torvalds break; 7021da177e4SLinus Torvalds default: 7031da177e4SLinus Torvalds error = err2; 7041da177e4SLinus Torvalds goto out; 7051da177e4SLinus Torvalds } 7061da177e4SLinus Torvalds } 7071da177e4SLinus Torvalds } 7081da177e4SLinus Torvalds *access = result; 7091da177e4SLinus Torvalds if (supported) 7101da177e4SLinus Torvalds *supported = sresult; 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds out: 7131da177e4SLinus Torvalds return error; 7141da177e4SLinus Torvalds } 7151da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 7161da177e4SLinus Torvalds 717105f4622SJ. Bruce Fields static int nfsd_open_break_lease(struct inode *inode, int access) 718105f4622SJ. Bruce Fields { 719105f4622SJ. Bruce Fields unsigned int mode; 7201da177e4SLinus Torvalds 721105f4622SJ. Bruce Fields if (access & NFSD_MAY_NOT_BREAK_LEASE) 722105f4622SJ. Bruce Fields return 0; 723105f4622SJ. Bruce Fields mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; 724105f4622SJ. Bruce Fields return break_lease(inode, mode | O_NONBLOCK); 725105f4622SJ. Bruce Fields } 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds /* 7281da177e4SLinus Torvalds * Open an existing file or directory. 7291da177e4SLinus Torvalds * The access argument indicates the type of open (read/write/lock) 7301da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 7311da177e4SLinus Torvalds */ 7326264d69dSAl Viro __be32 7331da177e4SLinus Torvalds nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 7341da177e4SLinus Torvalds int access, struct file **filp) 7351da177e4SLinus Torvalds { 7361da177e4SLinus Torvalds struct dentry *dentry; 7371da177e4SLinus Torvalds struct inode *inode; 7386264d69dSAl Viro int flags = O_RDONLY|O_LARGEFILE; 7396264d69dSAl Viro __be32 err; 74091885258SJeff Layton int host_err = 0; 7411da177e4SLinus Torvalds 742e0e81739SDavid Howells validate_process_creds(); 743e0e81739SDavid Howells 7441da177e4SLinus Torvalds /* 7451da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 7461da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 7471da177e4SLinus Torvalds * in case a chmod has now revoked permission. 7481da177e4SLinus Torvalds */ 7498837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE); 7501da177e4SLinus Torvalds if (err) 7511da177e4SLinus Torvalds goto out; 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds dentry = fhp->fh_dentry; 7541da177e4SLinus Torvalds inode = dentry->d_inode; 7551da177e4SLinus Torvalds 7561da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 7571da177e4SLinus Torvalds * or any access when mandatory locking enabled 7581da177e4SLinus Torvalds */ 7591da177e4SLinus Torvalds err = nfserr_perm; 7608837abcaSMiklos Szeredi if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE)) 7611da177e4SLinus Torvalds goto out; 7625e7fc436SJ. Bruce Fields /* 7635e7fc436SJ. Bruce Fields * We must ignore files (but only files) which might have mandatory 7645e7fc436SJ. Bruce Fields * locks on them because there is no way to know if the accesser has 7655e7fc436SJ. Bruce Fields * the lock. 7665e7fc436SJ. Bruce Fields */ 7675e7fc436SJ. Bruce Fields if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) 7681da177e4SLinus Torvalds goto out; 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvalds if (!inode->i_fop) 7711da177e4SLinus Torvalds goto out; 7721da177e4SLinus Torvalds 773105f4622SJ. Bruce Fields host_err = nfsd_open_break_lease(inode, access); 7746264d69dSAl Viro if (host_err) /* NOMEM or WOULDBLOCK */ 7751da177e4SLinus Torvalds goto out_nfserr; 7761da177e4SLinus Torvalds 7778837abcaSMiklos Szeredi if (access & NFSD_MAY_WRITE) { 7788837abcaSMiklos Szeredi if (access & NFSD_MAY_READ) 7799ecb6a08SJ. Bruce Fields flags = O_RDWR|O_LARGEFILE; 7809ecb6a08SJ. Bruce Fields else 7811da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 7821da177e4SLinus Torvalds } 78354775491SJan Blunck *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt), 784033a666cSDavid Howells flags, current_cred()); 7851da177e4SLinus Torvalds if (IS_ERR(*filp)) 7866264d69dSAl Viro host_err = PTR_ERR(*filp); 787aeaa5ccdSChuck Ebbert else 7889bbb6cadSMimi Zohar host_err = ima_file_check(*filp, access); 7891da177e4SLinus Torvalds out_nfserr: 7906264d69dSAl Viro err = nfserrno(host_err); 7911da177e4SLinus Torvalds out: 792e0e81739SDavid Howells validate_process_creds(); 7931da177e4SLinus Torvalds return err; 7941da177e4SLinus Torvalds } 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds /* 7971da177e4SLinus Torvalds * Close a file. 7981da177e4SLinus Torvalds */ 7991da177e4SLinus Torvalds void 8001da177e4SLinus Torvalds nfsd_close(struct file *filp) 8011da177e4SLinus Torvalds { 8021da177e4SLinus Torvalds fput(filp); 8031da177e4SLinus Torvalds } 8041da177e4SLinus Torvalds 8059a8d248eSJ. Bruce Fields /* 8061da177e4SLinus Torvalds * Obtain the readahead parameters for the file 8071da177e4SLinus Torvalds * specified by (dev, ino). 8081da177e4SLinus Torvalds */ 8091da177e4SLinus Torvalds 8101da177e4SLinus Torvalds static inline struct raparms * 8111da177e4SLinus Torvalds nfsd_get_raparms(dev_t dev, ino_t ino) 8121da177e4SLinus Torvalds { 8131da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 8141da177e4SLinus Torvalds int depth = 0; 815fce1456aSGreg Banks unsigned int hash; 816fce1456aSGreg Banks struct raparm_hbucket *rab; 8171da177e4SLinus Torvalds 818fce1456aSGreg Banks hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; 819fce1456aSGreg Banks rab = &raparm_hash[hash]; 820fce1456aSGreg Banks 821fce1456aSGreg Banks spin_lock(&rab->pb_lock); 822fce1456aSGreg Banks for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { 8231da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 8241da177e4SLinus Torvalds goto found; 8251da177e4SLinus Torvalds depth++; 8261da177e4SLinus Torvalds if (ra->p_count == 0) 8271da177e4SLinus Torvalds frap = rap; 8281da177e4SLinus Torvalds } 8293aa6e0aaSKonstantin Khorenko depth = nfsdstats.ra_size; 8301da177e4SLinus Torvalds if (!frap) { 831fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8321da177e4SLinus Torvalds return NULL; 8331da177e4SLinus Torvalds } 8341da177e4SLinus Torvalds rap = frap; 8351da177e4SLinus Torvalds ra = *frap; 8361da177e4SLinus Torvalds ra->p_dev = dev; 8371da177e4SLinus Torvalds ra->p_ino = ino; 8381da177e4SLinus Torvalds ra->p_set = 0; 839fce1456aSGreg Banks ra->p_hindex = hash; 8401da177e4SLinus Torvalds found: 841fce1456aSGreg Banks if (rap != &rab->pb_head) { 8421da177e4SLinus Torvalds *rap = ra->p_next; 843fce1456aSGreg Banks ra->p_next = rab->pb_head; 844fce1456aSGreg Banks rab->pb_head = ra; 8451da177e4SLinus Torvalds } 8461da177e4SLinus Torvalds ra->p_count++; 8471da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 848fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8491da177e4SLinus Torvalds return ra; 8501da177e4SLinus Torvalds } 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds /* 853cf8208d0SJens Axboe * Grab and keep cached pages associated with a file in the svc_rqst 854cf8208d0SJens Axboe * so that they can be passed to the network sendmsg/sendpage routines 855cf8208d0SJens Axboe * directly. They will be released after the sending has completed. 8561da177e4SLinus Torvalds */ 8571da177e4SLinus Torvalds static int 858cf8208d0SJens Axboe nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, 859cf8208d0SJens Axboe struct splice_desc *sd) 8601da177e4SLinus Torvalds { 861cf8208d0SJens Axboe struct svc_rqst *rqstp = sd->u.data; 86244524359SNeilBrown struct page **pp = rqstp->rq_respages + rqstp->rq_resused; 863cf8208d0SJens Axboe struct page *page = buf->page; 864cf8208d0SJens Axboe size_t size; 865cf8208d0SJens Axboe 866cf8208d0SJens Axboe size = sd->len; 8671da177e4SLinus Torvalds 8681da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 8691da177e4SLinus Torvalds get_page(page); 87044524359SNeilBrown put_page(*pp); 87144524359SNeilBrown *pp = page; 87244524359SNeilBrown rqstp->rq_resused++; 873cf8208d0SJens Axboe rqstp->rq_res.page_base = buf->offset; 8741da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 87544524359SNeilBrown } else if (page != pp[-1]) { 8761da177e4SLinus Torvalds get_page(page); 877250f3915SNeilBrown if (*pp) 87844524359SNeilBrown put_page(*pp); 87944524359SNeilBrown *pp = page; 88044524359SNeilBrown rqstp->rq_resused++; 8811da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 88244524359SNeilBrown } else 8831da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds return size; 8861da177e4SLinus Torvalds } 8871da177e4SLinus Torvalds 888cf8208d0SJens Axboe static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, 889cf8208d0SJens Axboe struct splice_desc *sd) 890cf8208d0SJens Axboe { 891cf8208d0SJens Axboe return __splice_from_pipe(pipe, sd, nfsd_splice_actor); 892cf8208d0SJens Axboe } 893cf8208d0SJens Axboe 8946264d69dSAl Viro static __be32 8951da177e4SLinus Torvalds nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 8961da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 8971da177e4SLinus Torvalds { 8981da177e4SLinus Torvalds mm_segment_t oldfs; 8996264d69dSAl Viro __be32 err; 9006264d69dSAl Viro int host_err; 9011da177e4SLinus Torvalds 9021da177e4SLinus Torvalds err = nfserr_perm; 903a8754beeSDave Hansen 904cf8208d0SJens Axboe if (file->f_op->splice_read && rqstp->rq_splice_ok) { 905cf8208d0SJens Axboe struct splice_desc sd = { 906cf8208d0SJens Axboe .len = 0, 907cf8208d0SJens Axboe .total_len = *count, 908cf8208d0SJens Axboe .pos = offset, 909cf8208d0SJens Axboe .u.data = rqstp, 910cf8208d0SJens Axboe }; 911cf8208d0SJens Axboe 9124fbef206SJens Axboe rqstp->rq_resused = 1; 913cf8208d0SJens Axboe host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); 9141da177e4SLinus Torvalds } else { 9151da177e4SLinus Torvalds oldfs = get_fs(); 9161da177e4SLinus Torvalds set_fs(KERNEL_DS); 9176264d69dSAl Viro host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); 9181da177e4SLinus Torvalds set_fs(oldfs); 9191da177e4SLinus Torvalds } 9201da177e4SLinus Torvalds 9216264d69dSAl Viro if (host_err >= 0) { 9226264d69dSAl Viro nfsdstats.io_read += host_err; 9236264d69dSAl Viro *count = host_err; 9241da177e4SLinus Torvalds err = 0; 9252a12a9d7SEric Paris fsnotify_access(file); 9261da177e4SLinus Torvalds } else 9276264d69dSAl Viro err = nfserrno(host_err); 9281da177e4SLinus Torvalds return err; 9291da177e4SLinus Torvalds } 9301da177e4SLinus Torvalds 9319f708e40SNeil Brown static void kill_suid(struct dentry *dentry) 9329f708e40SNeil Brown { 9339f708e40SNeil Brown struct iattr ia; 934b5376771SSerge E. Hallyn ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; 9359f708e40SNeil Brown 9361b1dcc1bSJes Sorensen mutex_lock(&dentry->d_inode->i_mutex); 9379f708e40SNeil Brown notify_change(dentry, &ia); 9381b1dcc1bSJes Sorensen mutex_unlock(&dentry->d_inode->i_mutex); 9399f708e40SNeil Brown } 9409f708e40SNeil Brown 941d911df7bSJ. Bruce Fields /* 942d911df7bSJ. Bruce Fields * Gathered writes: If another process is currently writing to the file, 943d911df7bSJ. Bruce Fields * there's a high chance this is another nfsd (triggered by a bulk write 944d911df7bSJ. Bruce Fields * from a client's biod). Rather than syncing the file with each write 945d911df7bSJ. Bruce Fields * request, we sleep for 10 msec. 946d911df7bSJ. Bruce Fields * 947d911df7bSJ. Bruce Fields * I don't know if this roughly approximates C. Juszak's idea of 948d911df7bSJ. Bruce Fields * gathered writes, but it's a nice and simple solution (IMHO), and it 949d911df7bSJ. Bruce Fields * seems to work:-) 950d911df7bSJ. Bruce Fields * 951d911df7bSJ. Bruce Fields * Note: we do this only in the NFSv2 case, since v3 and higher have a 952d911df7bSJ. Bruce Fields * better tool (separate unstable writes and commits) for solving this 953d911df7bSJ. Bruce Fields * problem. 954d911df7bSJ. Bruce Fields */ 955d911df7bSJ. Bruce Fields static int wait_for_concurrent_writes(struct file *file) 956d911df7bSJ. Bruce Fields { 957d911df7bSJ. Bruce Fields struct inode *inode = file->f_path.dentry->d_inode; 958d911df7bSJ. Bruce Fields static ino_t last_ino; 959d911df7bSJ. Bruce Fields static dev_t last_dev; 960d911df7bSJ. Bruce Fields int err = 0; 961d911df7bSJ. Bruce Fields 962d911df7bSJ. Bruce Fields if (atomic_read(&inode->i_writecount) > 1 963d911df7bSJ. Bruce Fields || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 964d911df7bSJ. Bruce Fields dprintk("nfsd: write defer %d\n", task_pid_nr(current)); 965d911df7bSJ. Bruce Fields msleep(10); 966d911df7bSJ. Bruce Fields dprintk("nfsd: write resume %d\n", task_pid_nr(current)); 967d911df7bSJ. Bruce Fields } 968d911df7bSJ. Bruce Fields 969d911df7bSJ. Bruce Fields if (inode->i_state & I_DIRTY) { 970d911df7bSJ. Bruce Fields dprintk("nfsd: write sync %d\n", task_pid_nr(current)); 9718018ab05SChristoph Hellwig err = vfs_fsync(file, 0); 972d911df7bSJ. Bruce Fields } 973d911df7bSJ. Bruce Fields last_ino = inode->i_ino; 974d911df7bSJ. Bruce Fields last_dev = inode->i_sb->s_dev; 975d911df7bSJ. Bruce Fields return err; 976d911df7bSJ. Bruce Fields } 977d911df7bSJ. Bruce Fields 9786264d69dSAl Viro static __be32 9791da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 9801da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 98131dec253SDavid Shaw unsigned long *cnt, int *stablep) 9821da177e4SLinus Torvalds { 9831da177e4SLinus Torvalds struct svc_export *exp; 9841da177e4SLinus Torvalds struct dentry *dentry; 9851da177e4SLinus Torvalds struct inode *inode; 9861da177e4SLinus Torvalds mm_segment_t oldfs; 9876264d69dSAl Viro __be32 err = 0; 9886264d69dSAl Viro int host_err; 9891da177e4SLinus Torvalds int stable = *stablep; 99048e03bc5STrond Myklebust int use_wgather; 9911da177e4SLinus Torvalds 9927eaa36e2SJosef "Jeff" Sipek dentry = file->f_path.dentry; 9931da177e4SLinus Torvalds inode = dentry->d_inode; 9941da177e4SLinus Torvalds exp = fhp->fh_export; 9951da177e4SLinus Torvalds 9961da177e4SLinus Torvalds /* 9971da177e4SLinus Torvalds * Request sync writes if 9981da177e4SLinus Torvalds * - the sync export option has been set, or 9991da177e4SLinus Torvalds * - the client requested O_SYNC behavior (NFSv3 feature). 10001da177e4SLinus Torvalds * - The file system doesn't support fsync(). 100148e03bc5STrond Myklebust * When NFSv2 gathered writes have been configured for this volume, 10021da177e4SLinus Torvalds * flushing the data to disk is handled separately below. 10031da177e4SLinus Torvalds */ 100448e03bc5STrond Myklebust use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); 10051da177e4SLinus Torvalds 10063ba15148SHarvey Harrison if (!file->f_op->fsync) {/* COMMIT3 cannot work */ 10071da177e4SLinus Torvalds stable = 2; 10081da177e4SLinus Torvalds *stablep = 2; /* FILE_SYNC */ 10091da177e4SLinus Torvalds } 10101da177e4SLinus Torvalds 10111da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 10121da177e4SLinus Torvalds stable = 0; 101348e03bc5STrond Myklebust if (stable && !use_wgather) { 1014db1dd4d3SJonathan Corbet spin_lock(&file->f_lock); 10151da177e4SLinus Torvalds file->f_flags |= O_SYNC; 1016db1dd4d3SJonathan Corbet spin_unlock(&file->f_lock); 1017db1dd4d3SJonathan Corbet } 10181da177e4SLinus Torvalds 10191da177e4SLinus Torvalds /* Write the data. */ 10201da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 10216264d69dSAl Viro host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); 10221da177e4SLinus Torvalds set_fs(oldfs); 1023e4636d53SJ. Bruce Fields if (host_err < 0) 1024e4636d53SJ. Bruce Fields goto out_nfserr; 1025a0d24b29SWei Yongjun *cnt = host_err; 102631dec253SDavid Shaw nfsdstats.io_write += host_err; 10272a12a9d7SEric Paris fsnotify_modify(file); 10281da177e4SLinus Torvalds 10291da177e4SLinus Torvalds /* clear setuid/setgid flag after write */ 1030e4636d53SJ. Bruce Fields if (inode->i_mode & (S_ISUID | S_ISGID)) 10319f708e40SNeil Brown kill_suid(dentry); 10321da177e4SLinus Torvalds 1033e4636d53SJ. Bruce Fields if (stable && use_wgather) 1034d911df7bSJ. Bruce Fields host_err = wait_for_concurrent_writes(file); 10351da177e4SLinus Torvalds 1036e4636d53SJ. Bruce Fields out_nfserr: 10376264d69dSAl Viro dprintk("nfsd: write complete host_err=%d\n", host_err); 1038a0d24b29SWei Yongjun if (host_err >= 0) 10391da177e4SLinus Torvalds err = 0; 1040a0d24b29SWei Yongjun else 10416264d69dSAl Viro err = nfserrno(host_err); 10421da177e4SLinus Torvalds return err; 10431da177e4SLinus Torvalds } 10441da177e4SLinus Torvalds 10451da177e4SLinus Torvalds /* 10461da177e4SLinus Torvalds * Read data from a file. count must contain the requested read count 10471da177e4SLinus Torvalds * on entry. On return, *count contains the number of bytes actually read. 10481da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10491da177e4SLinus Torvalds */ 1050039a87caSJ. Bruce Fields __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, 1051fa0a2126SJ. Bruce Fields loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 1052fa0a2126SJ. Bruce Fields { 1053fa0a2126SJ. Bruce Fields struct file *file; 1054fa0a2126SJ. Bruce Fields struct inode *inode; 1055fa0a2126SJ. Bruce Fields struct raparms *ra; 1056fa0a2126SJ. Bruce Fields __be32 err; 1057fa0a2126SJ. Bruce Fields 1058fa0a2126SJ. Bruce Fields err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 1059fa0a2126SJ. Bruce Fields if (err) 1060fa0a2126SJ. Bruce Fields return err; 1061fa0a2126SJ. Bruce Fields 1062fa0a2126SJ. Bruce Fields inode = file->f_path.dentry->d_inode; 1063fa0a2126SJ. Bruce Fields 1064fa0a2126SJ. Bruce Fields /* Get readahead parameters */ 1065fa0a2126SJ. Bruce Fields ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); 1066fa0a2126SJ. Bruce Fields 1067fa0a2126SJ. Bruce Fields if (ra && ra->p_set) 1068fa0a2126SJ. Bruce Fields file->f_ra = ra->p_ra; 1069fa0a2126SJ. Bruce Fields 1070fa0a2126SJ. Bruce Fields err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 1071fa0a2126SJ. Bruce Fields 1072fa0a2126SJ. Bruce Fields /* Write back readahead params */ 1073fa0a2126SJ. Bruce Fields if (ra) { 1074fa0a2126SJ. Bruce Fields struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; 1075fa0a2126SJ. Bruce Fields spin_lock(&rab->pb_lock); 1076fa0a2126SJ. Bruce Fields ra->p_ra = file->f_ra; 1077fa0a2126SJ. Bruce Fields ra->p_set = 1; 1078fa0a2126SJ. Bruce Fields ra->p_count--; 1079fa0a2126SJ. Bruce Fields spin_unlock(&rab->pb_lock); 1080fa0a2126SJ. Bruce Fields } 1081fa0a2126SJ. Bruce Fields 1082fa0a2126SJ. Bruce Fields nfsd_close(file); 1083fa0a2126SJ. Bruce Fields return err; 1084fa0a2126SJ. Bruce Fields } 1085fa0a2126SJ. Bruce Fields 1086039a87caSJ. Bruce Fields /* As above, but use the provided file descriptor. */ 10876264d69dSAl Viro __be32 1088039a87caSJ. Bruce Fields nfsd_read_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10891da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 10901da177e4SLinus Torvalds unsigned long *count) 10911da177e4SLinus Torvalds { 10926264d69dSAl Viro __be32 err; 10931da177e4SLinus Torvalds 10941da177e4SLinus Torvalds if (file) { 10950ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 10968837abcaSMiklos Szeredi NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); 10971da177e4SLinus Torvalds if (err) 10981da177e4SLinus Torvalds goto out; 10991da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 1100039a87caSJ. Bruce Fields } else /* Note file may still be NULL in NFSv4 special stateid case: */ 1101039a87caSJ. Bruce Fields err = nfsd_read(rqstp, fhp, offset, vec, vlen, count); 11021da177e4SLinus Torvalds out: 11031da177e4SLinus Torvalds return err; 11041da177e4SLinus Torvalds } 11051da177e4SLinus Torvalds 11061da177e4SLinus Torvalds /* 11071da177e4SLinus Torvalds * Write data to a file. 11081da177e4SLinus Torvalds * The stable flag requests synchronous writes. 11091da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 11101da177e4SLinus Torvalds */ 11116264d69dSAl Viro __be32 11121da177e4SLinus Torvalds nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 111331dec253SDavid Shaw loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, 11141da177e4SLinus Torvalds int *stablep) 11151da177e4SLinus Torvalds { 11166264d69dSAl Viro __be32 err = 0; 11171da177e4SLinus Torvalds 11181da177e4SLinus Torvalds if (file) { 11190ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 11208837abcaSMiklos Szeredi NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); 11211da177e4SLinus Torvalds if (err) 11221da177e4SLinus Torvalds goto out; 11231da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, 11241da177e4SLinus Torvalds stablep); 11251da177e4SLinus Torvalds } else { 11268837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 11271da177e4SLinus Torvalds if (err) 11281da177e4SLinus Torvalds goto out; 11291da177e4SLinus Torvalds 11301da177e4SLinus Torvalds if (cnt) 11311da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, 11321da177e4SLinus Torvalds cnt, stablep); 11331da177e4SLinus Torvalds nfsd_close(file); 11341da177e4SLinus Torvalds } 11351da177e4SLinus Torvalds out: 11361da177e4SLinus Torvalds return err; 11371da177e4SLinus Torvalds } 11381da177e4SLinus Torvalds 11391da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 11401da177e4SLinus Torvalds /* 11411da177e4SLinus Torvalds * Commit all pending writes to stable storage. 1142aa696a6fSTrond Myklebust * 1143aa696a6fSTrond Myklebust * Note: we only guarantee that data that lies within the range specified 1144aa696a6fSTrond Myklebust * by the 'offset' and 'count' parameters will be synced. 11451da177e4SLinus Torvalds * 11461da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 11471da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 11481da177e4SLinus Torvalds */ 11496264d69dSAl Viro __be32 11501da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 11511da177e4SLinus Torvalds loff_t offset, unsigned long count) 11521da177e4SLinus Torvalds { 11531da177e4SLinus Torvalds struct file *file; 1154aa696a6fSTrond Myklebust loff_t end = LLONG_MAX; 1155aa696a6fSTrond Myklebust __be32 err = nfserr_inval; 11561da177e4SLinus Torvalds 1157aa696a6fSTrond Myklebust if (offset < 0) 1158aa696a6fSTrond Myklebust goto out; 1159aa696a6fSTrond Myklebust if (count != 0) { 1160aa696a6fSTrond Myklebust end = offset + (loff_t)count - 1; 1161aa696a6fSTrond Myklebust if (end < offset) 1162aa696a6fSTrond Myklebust goto out; 1163aa696a6fSTrond Myklebust } 11641da177e4SLinus Torvalds 116591885258SJeff Layton err = nfsd_open(rqstp, fhp, S_IFREG, 116691885258SJeff Layton NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file); 11678837abcaSMiklos Szeredi if (err) 1168aa696a6fSTrond Myklebust goto out; 11691da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 11708018ab05SChristoph Hellwig int err2 = vfs_fsync_range(file, offset, end, 0); 1171aa696a6fSTrond Myklebust 1172aa696a6fSTrond Myklebust if (err2 != -EINVAL) 1173aa696a6fSTrond Myklebust err = nfserrno(err2); 1174aa696a6fSTrond Myklebust else 11751da177e4SLinus Torvalds err = nfserr_notsupp; 11761da177e4SLinus Torvalds } 11771da177e4SLinus Torvalds 11781da177e4SLinus Torvalds nfsd_close(file); 1179aa696a6fSTrond Myklebust out: 11801da177e4SLinus Torvalds return err; 11811da177e4SLinus Torvalds } 11821da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 11831da177e4SLinus Torvalds 1184f2b0dee2SAdrian Bunk static __be32 11855c002b3bSJ. Bruce Fields nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, 11865c002b3bSJ. Bruce Fields struct iattr *iap) 11875c002b3bSJ. Bruce Fields { 11885c002b3bSJ. Bruce Fields /* 11895c002b3bSJ. Bruce Fields * Mode has already been set earlier in create: 11905c002b3bSJ. Bruce Fields */ 11915c002b3bSJ. Bruce Fields iap->ia_valid &= ~ATTR_MODE; 11925c002b3bSJ. Bruce Fields /* 11935c002b3bSJ. Bruce Fields * Setting uid/gid works only for root. Irix appears to 11945c002b3bSJ. Bruce Fields * send along the gid on create when it tries to implement 11955c002b3bSJ. Bruce Fields * setgid directories via NFS: 11965c002b3bSJ. Bruce Fields */ 11975cc0a840SDavid Howells if (current_fsuid() != 0) 11985c002b3bSJ. Bruce Fields iap->ia_valid &= ~(ATTR_UID|ATTR_GID); 11995c002b3bSJ. Bruce Fields if (iap->ia_valid) 12005c002b3bSJ. Bruce Fields return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 12015c002b3bSJ. Bruce Fields return 0; 12025c002b3bSJ. Bruce Fields } 12035c002b3bSJ. Bruce Fields 12044ac35c2fSwengang wang /* HPUX client sometimes creates a file in mode 000, and sets size to 0. 12054ac35c2fSwengang wang * setting size to 0 may fail for some specific file systems by the permission 12064ac35c2fSwengang wang * checking which requires WRITE permission but the mode is 000. 12074ac35c2fSwengang wang * we ignore the resizing(to 0) on the just new created file, since the size is 12084ac35c2fSwengang wang * 0 after file created. 12094ac35c2fSwengang wang * 12104ac35c2fSwengang wang * call this only after vfs_create() is called. 12114ac35c2fSwengang wang * */ 12124ac35c2fSwengang wang static void 12134ac35c2fSwengang wang nfsd_check_ignore_resizing(struct iattr *iap) 12144ac35c2fSwengang wang { 12154ac35c2fSwengang wang if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) 12164ac35c2fSwengang wang iap->ia_valid &= ~ATTR_SIZE; 12174ac35c2fSwengang wang } 12184ac35c2fSwengang wang 12191da177e4SLinus Torvalds /* 12201da177e4SLinus Torvalds * Create a file (regular, directory, device, fifo); UNIX sockets 12211da177e4SLinus Torvalds * not yet implemented. 12221da177e4SLinus Torvalds * If the response fh has been verified, the parent directory should 12231da177e4SLinus Torvalds * already be locked. Note that the parent directory is left locked. 12241da177e4SLinus Torvalds * 12251da177e4SLinus Torvalds * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 12261da177e4SLinus Torvalds */ 12276264d69dSAl Viro __be32 12281da177e4SLinus Torvalds nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 12291da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 12301da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 12311da177e4SLinus Torvalds { 12321da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 12331da177e4SLinus Torvalds struct inode *dirp; 12346264d69dSAl Viro __be32 err; 12355c002b3bSJ. Bruce Fields __be32 err2; 12366264d69dSAl Viro int host_err; 12371da177e4SLinus Torvalds 12381da177e4SLinus Torvalds err = nfserr_perm; 12391da177e4SLinus Torvalds if (!flen) 12401da177e4SLinus Torvalds goto out; 12411da177e4SLinus Torvalds err = nfserr_exist; 12421da177e4SLinus Torvalds if (isdotent(fname, flen)) 12431da177e4SLinus Torvalds goto out; 12441da177e4SLinus Torvalds 12458837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 12461da177e4SLinus Torvalds if (err) 12471da177e4SLinus Torvalds goto out; 12481da177e4SLinus Torvalds 12491da177e4SLinus Torvalds dentry = fhp->fh_dentry; 12501da177e4SLinus Torvalds dirp = dentry->d_inode; 12511da177e4SLinus Torvalds 12521da177e4SLinus Torvalds err = nfserr_notdir; 1253acfa4380SAl Viro if (!dirp->i_op->lookup) 12541da177e4SLinus Torvalds goto out; 12551da177e4SLinus Torvalds /* 12561da177e4SLinus Torvalds * Check whether the response file handle has been verified yet. 12571da177e4SLinus Torvalds * If it has, the parent directory should already be locked. 12581da177e4SLinus Torvalds */ 12591da177e4SLinus Torvalds if (!resfhp->fh_dentry) { 12601da177e4SLinus Torvalds /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ 126112fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 12621da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 12636264d69dSAl Viro host_err = PTR_ERR(dchild); 12641da177e4SLinus Torvalds if (IS_ERR(dchild)) 12651da177e4SLinus Torvalds goto out_nfserr; 12661da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 12671da177e4SLinus Torvalds if (err) 12681da177e4SLinus Torvalds goto out; 12691da177e4SLinus Torvalds } else { 12701da177e4SLinus Torvalds /* called from nfsd_proc_create */ 12711da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 12721da177e4SLinus Torvalds if (!fhp->fh_locked) { 12731da177e4SLinus Torvalds /* not actually possible */ 12741da177e4SLinus Torvalds printk(KERN_ERR 12751da177e4SLinus Torvalds "nfsd_create: parent %s/%s not locked!\n", 12761da177e4SLinus Torvalds dentry->d_parent->d_name.name, 12771da177e4SLinus Torvalds dentry->d_name.name); 1278d75f2b9fSAl Viro err = nfserr_io; 12791da177e4SLinus Torvalds goto out; 12801da177e4SLinus Torvalds } 12811da177e4SLinus Torvalds } 12821da177e4SLinus Torvalds /* 12831da177e4SLinus Torvalds * Make sure the child dentry is still negative ... 12841da177e4SLinus Torvalds */ 12851da177e4SLinus Torvalds err = nfserr_exist; 12861da177e4SLinus Torvalds if (dchild->d_inode) { 12871da177e4SLinus Torvalds dprintk("nfsd_create: dentry %s/%s not negative!\n", 12881da177e4SLinus Torvalds dentry->d_name.name, dchild->d_name.name); 12891da177e4SLinus Torvalds goto out; 12901da177e4SLinus Torvalds } 12911da177e4SLinus Torvalds 12921da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 12931da177e4SLinus Torvalds iap->ia_mode = 0; 12941da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 12951da177e4SLinus Torvalds 129607cad1d2SMiklos Szeredi err = nfserr_inval; 129707cad1d2SMiklos Szeredi if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { 129807cad1d2SMiklos Szeredi printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", 129907cad1d2SMiklos Szeredi type); 130007cad1d2SMiklos Szeredi goto out; 130107cad1d2SMiklos Szeredi } 130207cad1d2SMiklos Szeredi 130307cad1d2SMiklos Szeredi host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 130407cad1d2SMiklos Szeredi if (host_err) 130507cad1d2SMiklos Szeredi goto out_nfserr; 130607cad1d2SMiklos Szeredi 13071da177e4SLinus Torvalds /* 13081da177e4SLinus Torvalds * Get the dir op function pointer. 13091da177e4SLinus Torvalds */ 1310088406bcSJ. Bruce Fields err = 0; 13111da177e4SLinus Torvalds switch (type) { 13121da177e4SLinus Torvalds case S_IFREG: 13136264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 13144ac35c2fSwengang wang if (!host_err) 13154ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 13161da177e4SLinus Torvalds break; 13171da177e4SLinus Torvalds case S_IFDIR: 13186264d69dSAl Viro host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); 13191da177e4SLinus Torvalds break; 13201da177e4SLinus Torvalds case S_IFCHR: 13211da177e4SLinus Torvalds case S_IFBLK: 13221da177e4SLinus Torvalds case S_IFIFO: 13231da177e4SLinus Torvalds case S_IFSOCK: 13246264d69dSAl Viro host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 13251da177e4SLinus Torvalds break; 1326463c3197SDave Hansen } 1327463c3197SDave Hansen if (host_err < 0) { 1328463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1329463c3197SDave Hansen goto out_nfserr; 1330463c3197SDave Hansen } 13311da177e4SLinus Torvalds 1332f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 13331da177e4SLinus Torvalds 1334f501912aSBen Myers /* 1335f501912aSBen Myers * nfsd_setattr already committed the child. Transactional filesystems 1336f501912aSBen Myers * had a chance to commit changes for both parent and child 1337f501912aSBen Myers * simultaneously making the following commit_metadata a noop. 1338f501912aSBen Myers */ 1339f501912aSBen Myers err2 = nfserrno(commit_metadata(fhp)); 1340f193fbabSYAMAMOTO Takashi if (err2) 1341f193fbabSYAMAMOTO Takashi err = err2; 1342463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 13431da177e4SLinus Torvalds /* 13441da177e4SLinus Torvalds * Update the file handle to get the new inode info. 13451da177e4SLinus Torvalds */ 13461da177e4SLinus Torvalds if (!err) 13471da177e4SLinus Torvalds err = fh_update(resfhp); 13481da177e4SLinus Torvalds out: 13491da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 13501da177e4SLinus Torvalds dput(dchild); 13511da177e4SLinus Torvalds return err; 13521da177e4SLinus Torvalds 13531da177e4SLinus Torvalds out_nfserr: 13546264d69dSAl Viro err = nfserrno(host_err); 13551da177e4SLinus Torvalds goto out; 13561da177e4SLinus Torvalds } 13571da177e4SLinus Torvalds 13581da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 1359ac6721a1SMi Jinlong 1360ac6721a1SMi Jinlong static inline int nfsd_create_is_exclusive(int createmode) 1361ac6721a1SMi Jinlong { 1362ac6721a1SMi Jinlong return createmode == NFS3_CREATE_EXCLUSIVE 1363ac6721a1SMi Jinlong || createmode == NFS4_CREATE_EXCLUSIVE4_1; 1364ac6721a1SMi Jinlong } 1365ac6721a1SMi Jinlong 13661da177e4SLinus Torvalds /* 1367ac6721a1SMi Jinlong * NFSv3 and NFSv4 version of nfsd_create 13681da177e4SLinus Torvalds */ 13696264d69dSAl Viro __be32 1370ac6721a1SMi Jinlong do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 13711da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 13721da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 137381ac95c5SJ. Bruce Fields int *truncp, int *created) 13741da177e4SLinus Torvalds { 13751da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 13761da177e4SLinus Torvalds struct inode *dirp; 13776264d69dSAl Viro __be32 err; 13786264d69dSAl Viro int host_err; 13791da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 13801da177e4SLinus Torvalds 13811da177e4SLinus Torvalds err = nfserr_perm; 13821da177e4SLinus Torvalds if (!flen) 13831da177e4SLinus Torvalds goto out; 13841da177e4SLinus Torvalds err = nfserr_exist; 13851da177e4SLinus Torvalds if (isdotent(fname, flen)) 13861da177e4SLinus Torvalds goto out; 13871da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 13881da177e4SLinus Torvalds iap->ia_mode = 0; 13891574dff8SSachin Prabhu err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 13901da177e4SLinus Torvalds if (err) 13911da177e4SLinus Torvalds goto out; 13921da177e4SLinus Torvalds 13931da177e4SLinus Torvalds dentry = fhp->fh_dentry; 13941da177e4SLinus Torvalds dirp = dentry->d_inode; 13951da177e4SLinus Torvalds 13961da177e4SLinus Torvalds /* Get all the sanity checks out of the way before 13971da177e4SLinus Torvalds * we lock the parent. */ 13981da177e4SLinus Torvalds err = nfserr_notdir; 1399acfa4380SAl Viro if (!dirp->i_op->lookup) 14001da177e4SLinus Torvalds goto out; 140112fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 14021da177e4SLinus Torvalds 14031da177e4SLinus Torvalds /* 14041da177e4SLinus Torvalds * Compose the response file handle. 14051da177e4SLinus Torvalds */ 14061da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 14076264d69dSAl Viro host_err = PTR_ERR(dchild); 14081da177e4SLinus Torvalds if (IS_ERR(dchild)) 14091da177e4SLinus Torvalds goto out_nfserr; 14101da177e4SLinus Torvalds 14111574dff8SSachin Prabhu /* If file doesn't exist, check for permissions to create one */ 14121574dff8SSachin Prabhu if (!dchild->d_inode) { 14131574dff8SSachin Prabhu err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 14141574dff8SSachin Prabhu if (err) 14151574dff8SSachin Prabhu goto out; 14161574dff8SSachin Prabhu } 14171574dff8SSachin Prabhu 14181da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 14191da177e4SLinus Torvalds if (err) 14201da177e4SLinus Torvalds goto out; 14211da177e4SLinus Torvalds 1422ac6721a1SMi Jinlong if (nfsd_create_is_exclusive(createmode)) { 1423c397852cSPeter Staubach /* solaris7 gets confused (bugid 4218508) if these have 1424749997e5SJeff Layton * the high bit set, so just clear the high bits. If this is 1425749997e5SJeff Layton * ever changed to use different attrs for storing the 1426749997e5SJeff Layton * verifier, then do_open_lookup() will also need to be fixed 1427749997e5SJeff Layton * accordingly. 14281da177e4SLinus Torvalds */ 14291da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 14301da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 14311da177e4SLinus Torvalds } 14321da177e4SLinus Torvalds 1433463c3197SDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 1434463c3197SDave Hansen if (host_err) 1435463c3197SDave Hansen goto out_nfserr; 14361da177e4SLinus Torvalds if (dchild->d_inode) { 14371da177e4SLinus Torvalds err = 0; 14381da177e4SLinus Torvalds 14391da177e4SLinus Torvalds switch (createmode) { 14401da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 14411da177e4SLinus Torvalds if (! S_ISREG(dchild->d_inode->i_mode)) 14421da177e4SLinus Torvalds err = nfserr_exist; 14431da177e4SLinus Torvalds else if (truncp) { 14441da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 14451da177e4SLinus Torvalds * differently. we don't want to truncate the 14461da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 14471da177e4SLinus Torvalds * fails for some other reason. furthermore, 14481da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 14491da177e4SLinus Torvalds * according to spec! 14501da177e4SLinus Torvalds */ 14511da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 14521da177e4SLinus Torvalds } 14531da177e4SLinus Torvalds else { 14541da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 14551da177e4SLinus Torvalds goto set_attr; 14561da177e4SLinus Torvalds } 14571da177e4SLinus Torvalds break; 14581da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 14591da177e4SLinus Torvalds if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 14601da177e4SLinus Torvalds && dchild->d_inode->i_atime.tv_sec == v_atime 14611da177e4SLinus Torvalds && dchild->d_inode->i_size == 0 ) 14621da177e4SLinus Torvalds break; 1463ac6721a1SMi Jinlong case NFS4_CREATE_EXCLUSIVE4_1: 1464ac6721a1SMi Jinlong if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 1465ac6721a1SMi Jinlong && dchild->d_inode->i_atime.tv_sec == v_atime 1466ac6721a1SMi Jinlong && dchild->d_inode->i_size == 0 ) 1467ac6721a1SMi Jinlong goto set_attr; 14681da177e4SLinus Torvalds /* fallthru */ 14691da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 14701da177e4SLinus Torvalds err = nfserr_exist; 14711da177e4SLinus Torvalds } 1472463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14731da177e4SLinus Torvalds goto out; 14741da177e4SLinus Torvalds } 14751da177e4SLinus Torvalds 14766264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 1477463c3197SDave Hansen if (host_err < 0) { 1478463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14791da177e4SLinus Torvalds goto out_nfserr; 1480463c3197SDave Hansen } 148181ac95c5SJ. Bruce Fields if (created) 148281ac95c5SJ. Bruce Fields *created = 1; 14831da177e4SLinus Torvalds 14844ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 14854ac35c2fSwengang wang 1486ac6721a1SMi Jinlong if (nfsd_create_is_exclusive(createmode)) { 1487c397852cSPeter Staubach /* Cram the verifier into atime/mtime */ 14881da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 1489c397852cSPeter Staubach | ATTR_MTIME_SET|ATTR_ATIME_SET; 14901da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 14911da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 14921da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 14931da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 14941da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 14951da177e4SLinus Torvalds } 14961da177e4SLinus Torvalds 14971da177e4SLinus Torvalds set_attr: 1498f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 1499f501912aSBen Myers 1500f501912aSBen Myers /* 1501f501912aSBen Myers * nfsd_setattr already committed the child (and possibly also the parent). 1502f501912aSBen Myers */ 1503f501912aSBen Myers if (!err) 1504f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 1505f193fbabSYAMAMOTO Takashi 1506463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1507f193fbabSYAMAMOTO Takashi /* 1508f193fbabSYAMAMOTO Takashi * Update the filehandle to get the new inode info. 1509f193fbabSYAMAMOTO Takashi */ 1510f193fbabSYAMAMOTO Takashi if (!err) 1511f193fbabSYAMAMOTO Takashi err = fh_update(resfhp); 15121da177e4SLinus Torvalds 15131da177e4SLinus Torvalds out: 15141da177e4SLinus Torvalds fh_unlock(fhp); 15151da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 15161da177e4SLinus Torvalds dput(dchild); 15171da177e4SLinus Torvalds return err; 15181da177e4SLinus Torvalds 15191da177e4SLinus Torvalds out_nfserr: 15206264d69dSAl Viro err = nfserrno(host_err); 15211da177e4SLinus Torvalds goto out; 15221da177e4SLinus Torvalds } 15231da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 15241da177e4SLinus Torvalds 15251da177e4SLinus Torvalds /* 15261da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 15271da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 15281da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 15291da177e4SLinus Torvalds */ 15306264d69dSAl Viro __be32 15311da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 15321da177e4SLinus Torvalds { 15331da177e4SLinus Torvalds struct dentry *dentry; 15341da177e4SLinus Torvalds struct inode *inode; 15351da177e4SLinus Torvalds mm_segment_t oldfs; 15366264d69dSAl Viro __be32 err; 15376264d69dSAl Viro int host_err; 15381da177e4SLinus Torvalds 15398837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); 15401da177e4SLinus Torvalds if (err) 15411da177e4SLinus Torvalds goto out; 15421da177e4SLinus Torvalds 15431da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15441da177e4SLinus Torvalds inode = dentry->d_inode; 15451da177e4SLinus Torvalds 15461da177e4SLinus Torvalds err = nfserr_inval; 1547acfa4380SAl Viro if (!inode->i_op->readlink) 15481da177e4SLinus Torvalds goto out; 15491da177e4SLinus Torvalds 155054775491SJan Blunck touch_atime(fhp->fh_export->ex_path.mnt, dentry); 15511da177e4SLinus Torvalds /* N.B. Why does this call need a get_fs()?? 15521da177e4SLinus Torvalds * Remove the set_fs and watch the fireworks:-) --okir 15531da177e4SLinus Torvalds */ 15541da177e4SLinus Torvalds 15551da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 15566264d69dSAl Viro host_err = inode->i_op->readlink(dentry, buf, *lenp); 15571da177e4SLinus Torvalds set_fs(oldfs); 15581da177e4SLinus Torvalds 15596264d69dSAl Viro if (host_err < 0) 15601da177e4SLinus Torvalds goto out_nfserr; 15616264d69dSAl Viro *lenp = host_err; 15621da177e4SLinus Torvalds err = 0; 15631da177e4SLinus Torvalds out: 15641da177e4SLinus Torvalds return err; 15651da177e4SLinus Torvalds 15661da177e4SLinus Torvalds out_nfserr: 15676264d69dSAl Viro err = nfserrno(host_err); 15681da177e4SLinus Torvalds goto out; 15691da177e4SLinus Torvalds } 15701da177e4SLinus Torvalds 15711da177e4SLinus Torvalds /* 15721da177e4SLinus Torvalds * Create a symlink and look up its inode 15731da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 15741da177e4SLinus Torvalds */ 15756264d69dSAl Viro __be32 15761da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 15771da177e4SLinus Torvalds char *fname, int flen, 15781da177e4SLinus Torvalds char *path, int plen, 15791da177e4SLinus Torvalds struct svc_fh *resfhp, 15801da177e4SLinus Torvalds struct iattr *iap) 15811da177e4SLinus Torvalds { 15821da177e4SLinus Torvalds struct dentry *dentry, *dnew; 15836264d69dSAl Viro __be32 err, cerr; 15846264d69dSAl Viro int host_err; 15851da177e4SLinus Torvalds 15861da177e4SLinus Torvalds err = nfserr_noent; 15871da177e4SLinus Torvalds if (!flen || !plen) 15881da177e4SLinus Torvalds goto out; 15891da177e4SLinus Torvalds err = nfserr_exist; 15901da177e4SLinus Torvalds if (isdotent(fname, flen)) 15911da177e4SLinus Torvalds goto out; 15921da177e4SLinus Torvalds 15938837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 15941da177e4SLinus Torvalds if (err) 15951da177e4SLinus Torvalds goto out; 15961da177e4SLinus Torvalds fh_lock(fhp); 15971da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15981da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 15996264d69dSAl Viro host_err = PTR_ERR(dnew); 16001da177e4SLinus Torvalds if (IS_ERR(dnew)) 16011da177e4SLinus Torvalds goto out_nfserr; 16021da177e4SLinus Torvalds 160375c3f29dSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 160475c3f29dSDave Hansen if (host_err) 160575c3f29dSDave Hansen goto out_nfserr; 160675c3f29dSDave Hansen 16071da177e4SLinus Torvalds if (unlikely(path[plen] != 0)) { 16081da177e4SLinus Torvalds char *path_alloced = kmalloc(plen+1, GFP_KERNEL); 16091da177e4SLinus Torvalds if (path_alloced == NULL) 16106264d69dSAl Viro host_err = -ENOMEM; 16111da177e4SLinus Torvalds else { 16121da177e4SLinus Torvalds strncpy(path_alloced, path, plen); 16131da177e4SLinus Torvalds path_alloced[plen] = 0; 1614db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); 16151da177e4SLinus Torvalds kfree(path_alloced); 16161da177e4SLinus Torvalds } 16171da177e4SLinus Torvalds } else 1618db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path); 16196264d69dSAl Viro err = nfserrno(host_err); 1620f501912aSBen Myers if (!err) 1621f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 16221da177e4SLinus Torvalds fh_unlock(fhp); 16231da177e4SLinus Torvalds 162475c3f29dSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 162575c3f29dSDave Hansen 16261da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 16271da177e4SLinus Torvalds dput(dnew); 16281da177e4SLinus Torvalds if (err==0) err = cerr; 16291da177e4SLinus Torvalds out: 16301da177e4SLinus Torvalds return err; 16311da177e4SLinus Torvalds 16321da177e4SLinus Torvalds out_nfserr: 16336264d69dSAl Viro err = nfserrno(host_err); 16341da177e4SLinus Torvalds goto out; 16351da177e4SLinus Torvalds } 16361da177e4SLinus Torvalds 16371da177e4SLinus Torvalds /* 16381da177e4SLinus Torvalds * Create a hardlink 16391da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16401da177e4SLinus Torvalds */ 16416264d69dSAl Viro __be32 16421da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 16431da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 16441da177e4SLinus Torvalds { 16451da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 164655b13354SJ. Bruce Fields struct inode *dirp; 16476264d69dSAl Viro __be32 err; 16486264d69dSAl Viro int host_err; 16491da177e4SLinus Torvalds 16508837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); 16511da177e4SLinus Torvalds if (err) 16521da177e4SLinus Torvalds goto out; 16537d818a7bSJ. Bruce Fields err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); 16541da177e4SLinus Torvalds if (err) 16551da177e4SLinus Torvalds goto out; 16567d818a7bSJ. Bruce Fields err = nfserr_isdir; 16577d818a7bSJ. Bruce Fields if (S_ISDIR(tfhp->fh_dentry->d_inode->i_mode)) 16587d818a7bSJ. Bruce Fields goto out; 16591da177e4SLinus Torvalds err = nfserr_perm; 16601da177e4SLinus Torvalds if (!len) 16611da177e4SLinus Torvalds goto out; 16621da177e4SLinus Torvalds err = nfserr_exist; 16631da177e4SLinus Torvalds if (isdotent(name, len)) 16641da177e4SLinus Torvalds goto out; 16651da177e4SLinus Torvalds 166612fd3520SPeter Zijlstra fh_lock_nested(ffhp, I_MUTEX_PARENT); 16671da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 16681da177e4SLinus Torvalds dirp = ddir->d_inode; 16691da177e4SLinus Torvalds 16701da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 16716264d69dSAl Viro host_err = PTR_ERR(dnew); 16721da177e4SLinus Torvalds if (IS_ERR(dnew)) 16731da177e4SLinus Torvalds goto out_nfserr; 16741da177e4SLinus Torvalds 16751da177e4SLinus Torvalds dold = tfhp->fh_dentry; 16761da177e4SLinus Torvalds 167775c3f29dSDave Hansen host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt); 167875c3f29dSDave Hansen if (host_err) { 167975c3f29dSDave Hansen err = nfserrno(host_err); 168075c3f29dSDave Hansen goto out_dput; 168175c3f29dSDave Hansen } 16824795bb37SJ. Bruce Fields err = nfserr_noent; 16834795bb37SJ. Bruce Fields if (!dold->d_inode) 16844795bb37SJ. Bruce Fields goto out_drop_write; 16854795bb37SJ. Bruce Fields host_err = nfsd_break_lease(dold->d_inode); 16867d751f6fSCasey Bodley if (host_err) { 16877d751f6fSCasey Bodley err = nfserrno(host_err); 16884795bb37SJ. Bruce Fields goto out_drop_write; 16897d751f6fSCasey Bodley } 16906264d69dSAl Viro host_err = vfs_link(dold, dirp, dnew); 16916264d69dSAl Viro if (!host_err) { 1692f501912aSBen Myers err = nfserrno(commit_metadata(ffhp)); 1693f501912aSBen Myers if (!err) 1694f501912aSBen Myers err = nfserrno(commit_metadata(tfhp)); 16951da177e4SLinus Torvalds } else { 16966264d69dSAl Viro if (host_err == -EXDEV && rqstp->rq_vers == 2) 16971da177e4SLinus Torvalds err = nfserr_acces; 16981da177e4SLinus Torvalds else 16996264d69dSAl Viro err = nfserrno(host_err); 17001da177e4SLinus Torvalds } 17014795bb37SJ. Bruce Fields out_drop_write: 170275c3f29dSDave Hansen mnt_drop_write(tfhp->fh_export->ex_path.mnt); 170375c3f29dSDave Hansen out_dput: 17041da177e4SLinus Torvalds dput(dnew); 1705270d56e5SDavid M. Richter out_unlock: 1706270d56e5SDavid M. Richter fh_unlock(ffhp); 17071da177e4SLinus Torvalds out: 17081da177e4SLinus Torvalds return err; 17091da177e4SLinus Torvalds 17101da177e4SLinus Torvalds out_nfserr: 17116264d69dSAl Viro err = nfserrno(host_err); 1712270d56e5SDavid M. Richter goto out_unlock; 17131da177e4SLinus Torvalds } 17141da177e4SLinus Torvalds 17151da177e4SLinus Torvalds /* 17161da177e4SLinus Torvalds * Rename a file 17171da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 17181da177e4SLinus Torvalds */ 17196264d69dSAl Viro __be32 17201da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 17211da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 17221da177e4SLinus Torvalds { 17231da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 17241da177e4SLinus Torvalds struct inode *fdir, *tdir; 17256264d69dSAl Viro __be32 err; 17266264d69dSAl Viro int host_err; 17271da177e4SLinus Torvalds 17288837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); 17291da177e4SLinus Torvalds if (err) 17301da177e4SLinus Torvalds goto out; 17318837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); 17321da177e4SLinus Torvalds if (err) 17331da177e4SLinus Torvalds goto out; 17341da177e4SLinus Torvalds 17351da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 17361da177e4SLinus Torvalds fdir = fdentry->d_inode; 17371da177e4SLinus Torvalds 17381da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 17391da177e4SLinus Torvalds tdir = tdentry->d_inode; 17401da177e4SLinus Torvalds 17411da177e4SLinus Torvalds err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; 1742a56f3937SNeilBrown if (ffhp->fh_export != tfhp->fh_export) 17431da177e4SLinus Torvalds goto out; 17441da177e4SLinus Torvalds 17451da177e4SLinus Torvalds err = nfserr_perm; 17461da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 17471da177e4SLinus Torvalds goto out; 17481da177e4SLinus Torvalds 17491da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 17501da177e4SLinus Torvalds * so do it by hand */ 17511da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 17521da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 1; 17531da177e4SLinus Torvalds fill_pre_wcc(ffhp); 17541da177e4SLinus Torvalds fill_pre_wcc(tfhp); 17551da177e4SLinus Torvalds 17561da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 17576264d69dSAl Viro host_err = PTR_ERR(odentry); 17581da177e4SLinus Torvalds if (IS_ERR(odentry)) 17591da177e4SLinus Torvalds goto out_nfserr; 17601da177e4SLinus Torvalds 17616264d69dSAl Viro host_err = -ENOENT; 17621da177e4SLinus Torvalds if (!odentry->d_inode) 17631da177e4SLinus Torvalds goto out_dput_old; 17646264d69dSAl Viro host_err = -EINVAL; 17651da177e4SLinus Torvalds if (odentry == trap) 17661da177e4SLinus Torvalds goto out_dput_old; 17671da177e4SLinus Torvalds 17681da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 17696264d69dSAl Viro host_err = PTR_ERR(ndentry); 17701da177e4SLinus Torvalds if (IS_ERR(ndentry)) 17711da177e4SLinus Torvalds goto out_dput_old; 17726264d69dSAl Viro host_err = -ENOTEMPTY; 17731da177e4SLinus Torvalds if (ndentry == trap) 17741da177e4SLinus Torvalds goto out_dput_new; 17751da177e4SLinus Torvalds 17769079b1ebSDave Hansen host_err = -EXDEV; 17779079b1ebSDave Hansen if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) 17789079b1ebSDave Hansen goto out_dput_new; 17799079b1ebSDave Hansen host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt); 17809079b1ebSDave Hansen if (host_err) 17819079b1ebSDave Hansen goto out_dput_new; 17829079b1ebSDave Hansen 17834795bb37SJ. Bruce Fields host_err = nfsd_break_lease(odentry->d_inode); 17844795bb37SJ. Bruce Fields if (host_err) 17854795bb37SJ. Bruce Fields goto out_drop_write; 178683f6b0c1SJ. Bruce Fields if (ndentry->d_inode) { 178783f6b0c1SJ. Bruce Fields host_err = nfsd_break_lease(ndentry->d_inode); 178883f6b0c1SJ. Bruce Fields if (host_err) 178983f6b0c1SJ. Bruce Fields goto out_drop_write; 179083f6b0c1SJ. Bruce Fields } 17916264d69dSAl Viro host_err = vfs_rename(fdir, odentry, tdir, ndentry); 1792f501912aSBen Myers if (!host_err) { 1793f501912aSBen Myers host_err = commit_metadata(tfhp); 17946264d69dSAl Viro if (!host_err) 1795f501912aSBen Myers host_err = commit_metadata(ffhp); 17961da177e4SLinus Torvalds } 17974795bb37SJ. Bruce Fields out_drop_write: 17989079b1ebSDave Hansen mnt_drop_write(ffhp->fh_export->ex_path.mnt); 17991da177e4SLinus Torvalds out_dput_new: 18001da177e4SLinus Torvalds dput(ndentry); 18011da177e4SLinus Torvalds out_dput_old: 18021da177e4SLinus Torvalds dput(odentry); 18031da177e4SLinus Torvalds out_nfserr: 18046264d69dSAl Viro err = nfserrno(host_err); 18051da177e4SLinus Torvalds 18061da177e4SLinus Torvalds /* we cannot reply on fh_unlock on the two filehandles, 18071da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 18081da177e4SLinus Torvalds * were the same, so again we do it by hand 18091da177e4SLinus Torvalds */ 18101da177e4SLinus Torvalds fill_post_wcc(ffhp); 18111da177e4SLinus Torvalds fill_post_wcc(tfhp); 18121da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 18131da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 0; 18141da177e4SLinus Torvalds 18151da177e4SLinus Torvalds out: 18161da177e4SLinus Torvalds return err; 18171da177e4SLinus Torvalds } 18181da177e4SLinus Torvalds 18191da177e4SLinus Torvalds /* 18201da177e4SLinus Torvalds * Unlink a file or directory 18211da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 18221da177e4SLinus Torvalds */ 18236264d69dSAl Viro __be32 18241da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 18251da177e4SLinus Torvalds char *fname, int flen) 18261da177e4SLinus Torvalds { 18271da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 18281da177e4SLinus Torvalds struct inode *dirp; 18296264d69dSAl Viro __be32 err; 18306264d69dSAl Viro int host_err; 18311da177e4SLinus Torvalds 18321da177e4SLinus Torvalds err = nfserr_acces; 18331da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 18341da177e4SLinus Torvalds goto out; 18358837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); 18361da177e4SLinus Torvalds if (err) 18371da177e4SLinus Torvalds goto out; 18381da177e4SLinus Torvalds 183912fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 18401da177e4SLinus Torvalds dentry = fhp->fh_dentry; 18411da177e4SLinus Torvalds dirp = dentry->d_inode; 18421da177e4SLinus Torvalds 18431da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 18446264d69dSAl Viro host_err = PTR_ERR(rdentry); 18451da177e4SLinus Torvalds if (IS_ERR(rdentry)) 18461da177e4SLinus Torvalds goto out_nfserr; 18471da177e4SLinus Torvalds 18481da177e4SLinus Torvalds if (!rdentry->d_inode) { 18491da177e4SLinus Torvalds dput(rdentry); 18501da177e4SLinus Torvalds err = nfserr_noent; 18511da177e4SLinus Torvalds goto out; 18521da177e4SLinus Torvalds } 18531da177e4SLinus Torvalds 18541da177e4SLinus Torvalds if (!type) 18551da177e4SLinus Torvalds type = rdentry->d_inode->i_mode & S_IFMT; 18561da177e4SLinus Torvalds 18570622753bSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 18580622753bSDave Hansen if (host_err) 1859541ce98cSJ. Bruce Fields goto out_put; 18600622753bSDave Hansen 18614795bb37SJ. Bruce Fields host_err = nfsd_break_lease(rdentry->d_inode); 18624795bb37SJ. Bruce Fields if (host_err) 1863541ce98cSJ. Bruce Fields goto out_drop_write; 18649ce137eeSJ. Bruce Fields if (type != S_IFDIR) 18656264d69dSAl Viro host_err = vfs_unlink(dirp, rdentry); 18669ce137eeSJ. Bruce Fields else 18676264d69dSAl Viro host_err = vfs_rmdir(dirp, rdentry); 1868541ce98cSJ. Bruce Fields if (!host_err) 1869541ce98cSJ. Bruce Fields host_err = commit_metadata(fhp); 1870541ce98cSJ. Bruce Fields out_drop_write: 1871541ce98cSJ. Bruce Fields mnt_drop_write(fhp->fh_export->ex_path.mnt); 18724795bb37SJ. Bruce Fields out_put: 18731da177e4SLinus Torvalds dput(rdentry); 18741da177e4SLinus Torvalds 18751da177e4SLinus Torvalds out_nfserr: 18766264d69dSAl Viro err = nfserrno(host_err); 1877f193fbabSYAMAMOTO Takashi out: 1878f193fbabSYAMAMOTO Takashi return err; 18791da177e4SLinus Torvalds } 18801da177e4SLinus Torvalds 18811da177e4SLinus Torvalds /* 188214f7dd63SDavid Woodhouse * We do this buffering because we must not call back into the file 188314f7dd63SDavid Woodhouse * system's ->lookup() method from the filldir callback. That may well 188414f7dd63SDavid Woodhouse * deadlock a number of file systems. 188514f7dd63SDavid Woodhouse * 188614f7dd63SDavid Woodhouse * This is based heavily on the implementation of same in XFS. 188714f7dd63SDavid Woodhouse */ 188814f7dd63SDavid Woodhouse struct buffered_dirent { 188914f7dd63SDavid Woodhouse u64 ino; 189014f7dd63SDavid Woodhouse loff_t offset; 189114f7dd63SDavid Woodhouse int namlen; 189214f7dd63SDavid Woodhouse unsigned int d_type; 189314f7dd63SDavid Woodhouse char name[]; 189414f7dd63SDavid Woodhouse }; 189514f7dd63SDavid Woodhouse 189614f7dd63SDavid Woodhouse struct readdir_data { 189714f7dd63SDavid Woodhouse char *dirent; 189814f7dd63SDavid Woodhouse size_t used; 189953c9c5c0SAl Viro int full; 190014f7dd63SDavid Woodhouse }; 190114f7dd63SDavid Woodhouse 190214f7dd63SDavid Woodhouse static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, 190314f7dd63SDavid Woodhouse loff_t offset, u64 ino, unsigned int d_type) 190414f7dd63SDavid Woodhouse { 190514f7dd63SDavid Woodhouse struct readdir_data *buf = __buf; 190614f7dd63SDavid Woodhouse struct buffered_dirent *de = (void *)(buf->dirent + buf->used); 190714f7dd63SDavid Woodhouse unsigned int reclen; 190814f7dd63SDavid Woodhouse 190914f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); 191053c9c5c0SAl Viro if (buf->used + reclen > PAGE_SIZE) { 191153c9c5c0SAl Viro buf->full = 1; 191214f7dd63SDavid Woodhouse return -EINVAL; 191353c9c5c0SAl Viro } 191414f7dd63SDavid Woodhouse 191514f7dd63SDavid Woodhouse de->namlen = namlen; 191614f7dd63SDavid Woodhouse de->offset = offset; 191714f7dd63SDavid Woodhouse de->ino = ino; 191814f7dd63SDavid Woodhouse de->d_type = d_type; 191914f7dd63SDavid Woodhouse memcpy(de->name, name, namlen); 192014f7dd63SDavid Woodhouse buf->used += reclen; 192114f7dd63SDavid Woodhouse 192214f7dd63SDavid Woodhouse return 0; 192314f7dd63SDavid Woodhouse } 192414f7dd63SDavid Woodhouse 19252f9092e1SDavid Woodhouse static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func, 19262628b766SDavid Woodhouse struct readdir_cd *cdp, loff_t *offsetp) 19272628b766SDavid Woodhouse { 192814f7dd63SDavid Woodhouse struct readdir_data buf; 192914f7dd63SDavid Woodhouse struct buffered_dirent *de; 19302628b766SDavid Woodhouse int host_err; 193114f7dd63SDavid Woodhouse int size; 193214f7dd63SDavid Woodhouse loff_t offset; 19332628b766SDavid Woodhouse 193414f7dd63SDavid Woodhouse buf.dirent = (void *)__get_free_page(GFP_KERNEL); 193514f7dd63SDavid Woodhouse if (!buf.dirent) 19362f9092e1SDavid Woodhouse return nfserrno(-ENOMEM); 193714f7dd63SDavid Woodhouse 193814f7dd63SDavid Woodhouse offset = *offsetp; 19392628b766SDavid Woodhouse 194014f7dd63SDavid Woodhouse while (1) { 19412f9092e1SDavid Woodhouse struct inode *dir_inode = file->f_path.dentry->d_inode; 194214f7dd63SDavid Woodhouse unsigned int reclen; 194314f7dd63SDavid Woodhouse 1944b726e923SDoug Nazar cdp->err = nfserr_eof; /* will be cleared on successful read */ 194514f7dd63SDavid Woodhouse buf.used = 0; 194653c9c5c0SAl Viro buf.full = 0; 194714f7dd63SDavid Woodhouse 194814f7dd63SDavid Woodhouse host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf); 194953c9c5c0SAl Viro if (buf.full) 195053c9c5c0SAl Viro host_err = 0; 195153c9c5c0SAl Viro 195253c9c5c0SAl Viro if (host_err < 0) 195314f7dd63SDavid Woodhouse break; 195414f7dd63SDavid Woodhouse 195514f7dd63SDavid Woodhouse size = buf.used; 195614f7dd63SDavid Woodhouse 195714f7dd63SDavid Woodhouse if (!size) 195814f7dd63SDavid Woodhouse break; 195914f7dd63SDavid Woodhouse 19602f9092e1SDavid Woodhouse /* 19612f9092e1SDavid Woodhouse * Various filldir functions may end up calling back into 19622f9092e1SDavid Woodhouse * lookup_one_len() and the file system's ->lookup() method. 19632f9092e1SDavid Woodhouse * These expect i_mutex to be held, as it would within readdir. 19642f9092e1SDavid Woodhouse */ 19652f9092e1SDavid Woodhouse host_err = mutex_lock_killable(&dir_inode->i_mutex); 19662f9092e1SDavid Woodhouse if (host_err) 19672f9092e1SDavid Woodhouse break; 19682f9092e1SDavid Woodhouse 196914f7dd63SDavid Woodhouse de = (struct buffered_dirent *)buf.dirent; 197014f7dd63SDavid Woodhouse while (size > 0) { 197114f7dd63SDavid Woodhouse offset = de->offset; 197214f7dd63SDavid Woodhouse 197314f7dd63SDavid Woodhouse if (func(cdp, de->name, de->namlen, de->offset, 197414f7dd63SDavid Woodhouse de->ino, de->d_type)) 19752f9092e1SDavid Woodhouse break; 197614f7dd63SDavid Woodhouse 197714f7dd63SDavid Woodhouse if (cdp->err != nfs_ok) 19782f9092e1SDavid Woodhouse break; 197914f7dd63SDavid Woodhouse 198014f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(*de) + de->namlen, 198114f7dd63SDavid Woodhouse sizeof(u64)); 198214f7dd63SDavid Woodhouse size -= reclen; 198314f7dd63SDavid Woodhouse de = (struct buffered_dirent *)((char *)de + reclen); 198414f7dd63SDavid Woodhouse } 19852f9092e1SDavid Woodhouse mutex_unlock(&dir_inode->i_mutex); 19862f9092e1SDavid Woodhouse if (size > 0) /* We bailed out early */ 19872f9092e1SDavid Woodhouse break; 19882f9092e1SDavid Woodhouse 1989c002a6c7SDavid Woodhouse offset = vfs_llseek(file, 0, SEEK_CUR); 199014f7dd63SDavid Woodhouse } 199114f7dd63SDavid Woodhouse 199214f7dd63SDavid Woodhouse free_page((unsigned long)(buf.dirent)); 19932628b766SDavid Woodhouse 19942628b766SDavid Woodhouse if (host_err) 19952628b766SDavid Woodhouse return nfserrno(host_err); 199614f7dd63SDavid Woodhouse 199714f7dd63SDavid Woodhouse *offsetp = offset; 19982628b766SDavid Woodhouse return cdp->err; 19992628b766SDavid Woodhouse } 20002628b766SDavid Woodhouse 20011da177e4SLinus Torvalds /* 20021da177e4SLinus Torvalds * Read entries from a directory. 20031da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 20041da177e4SLinus Torvalds */ 20056264d69dSAl Viro __be32 20061da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 2007a0ad13efSNeilBrown struct readdir_cd *cdp, filldir_t func) 20081da177e4SLinus Torvalds { 20096264d69dSAl Viro __be32 err; 20101da177e4SLinus Torvalds struct file *file; 20111da177e4SLinus Torvalds loff_t offset = *offsetp; 20121da177e4SLinus Torvalds 20138837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file); 20141da177e4SLinus Torvalds if (err) 20151da177e4SLinus Torvalds goto out; 20161da177e4SLinus Torvalds 20171da177e4SLinus Torvalds offset = vfs_llseek(file, offset, 0); 20181da177e4SLinus Torvalds if (offset < 0) { 20191da177e4SLinus Torvalds err = nfserrno((int)offset); 20201da177e4SLinus Torvalds goto out_close; 20211da177e4SLinus Torvalds } 20221da177e4SLinus Torvalds 202314f7dd63SDavid Woodhouse err = nfsd_buffered_readdir(file, func, cdp, offsetp); 20241da177e4SLinus Torvalds 20251da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 20261da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 20271da177e4SLinus Torvalds out_close: 20281da177e4SLinus Torvalds nfsd_close(file); 20291da177e4SLinus Torvalds out: 20301da177e4SLinus Torvalds return err; 20311da177e4SLinus Torvalds } 20321da177e4SLinus Torvalds 20331da177e4SLinus Torvalds /* 20341da177e4SLinus Torvalds * Get file system stats 20351da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 20361da177e4SLinus Torvalds */ 20376264d69dSAl Viro __be32 203804716e66SJ. Bruce Fields nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) 20391da177e4SLinus Torvalds { 2040f6360efbSTakashi Iwai __be32 err; 2041f6360efbSTakashi Iwai 2042f6360efbSTakashi Iwai err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); 2043f6360efbSTakashi Iwai if (!err) { 2044ebabe9a9SChristoph Hellwig struct path path = { 2045ebabe9a9SChristoph Hellwig .mnt = fhp->fh_export->ex_path.mnt, 2046ebabe9a9SChristoph Hellwig .dentry = fhp->fh_dentry, 2047ebabe9a9SChristoph Hellwig }; 2048f6360efbSTakashi Iwai if (vfs_statfs(&path, stat)) 20491da177e4SLinus Torvalds err = nfserr_io; 2050f6360efbSTakashi Iwai } 20511da177e4SLinus Torvalds return err; 20521da177e4SLinus Torvalds } 20531da177e4SLinus Torvalds 2054c7d51402SJ. Bruce Fields static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) 2055e22841c6SJ. Bruce Fields { 2056c7d51402SJ. Bruce Fields return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; 2057e22841c6SJ. Bruce Fields } 2058e22841c6SJ. Bruce Fields 20591da177e4SLinus Torvalds /* 20601da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 20611da177e4SLinus Torvalds */ 20626264d69dSAl Viro __be32 20630ec757dfSJ. Bruce Fields nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, 20640ec757dfSJ. Bruce Fields struct dentry *dentry, int acc) 20651da177e4SLinus Torvalds { 20661da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 20671da177e4SLinus Torvalds int err; 20681da177e4SLinus Torvalds 2069aea93397SJ. Bruce Fields if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) 20701da177e4SLinus Torvalds return 0; 20711da177e4SLinus Torvalds #if 0 20721da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 20731da177e4SLinus Torvalds acc, 20748837abcaSMiklos Szeredi (acc & NFSD_MAY_READ)? " read" : "", 20758837abcaSMiklos Szeredi (acc & NFSD_MAY_WRITE)? " write" : "", 20768837abcaSMiklos Szeredi (acc & NFSD_MAY_EXEC)? " exec" : "", 20778837abcaSMiklos Szeredi (acc & NFSD_MAY_SATTR)? " sattr" : "", 20788837abcaSMiklos Szeredi (acc & NFSD_MAY_TRUNC)? " trunc" : "", 20798837abcaSMiklos Szeredi (acc & NFSD_MAY_LOCK)? " lock" : "", 20808837abcaSMiklos Szeredi (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", 20811da177e4SLinus Torvalds inode->i_mode, 20821da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 20831da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 20842c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); 20851da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 20865cc0a840SDavid Howells inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); 20871da177e4SLinus Torvalds #endif 20881da177e4SLinus Torvalds 20891da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 20901da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 20911da177e4SLinus Torvalds * device special file, we ignore rofs. 20921da177e4SLinus Torvalds */ 20938837abcaSMiklos Szeredi if (!(acc & NFSD_MAY_LOCAL_ACCESS)) 20948837abcaSMiklos Szeredi if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { 20952c463e95SDave Hansen if (exp_rdonly(rqstp, exp) || 20962c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)) 20971da177e4SLinus Torvalds return nfserr_rofs; 20988837abcaSMiklos Szeredi if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) 20991da177e4SLinus Torvalds return nfserr_perm; 21001da177e4SLinus Torvalds } 21018837abcaSMiklos Szeredi if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) 21021da177e4SLinus Torvalds return nfserr_perm; 21031da177e4SLinus Torvalds 21048837abcaSMiklos Szeredi if (acc & NFSD_MAY_LOCK) { 21051da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 21061da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 21071da177e4SLinus Torvalds * ownership 21081da177e4SLinus Torvalds */ 21091da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 21101da177e4SLinus Torvalds return 0; 21111da177e4SLinus Torvalds else 21128837abcaSMiklos Szeredi acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; 21131da177e4SLinus Torvalds } 21141da177e4SLinus Torvalds /* 21151da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 21161da177e4SLinus Torvalds * would normally be checked at open time. This is to make 21171da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 21181da177e4SLinus Torvalds * 21191da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 21201da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 21211da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 21221da177e4SLinus Torvalds * always implies file truncation. 21231da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 21241da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 21251da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 21261da177e4SLinus Torvalds * with NFSv3. 21271da177e4SLinus Torvalds */ 21288837abcaSMiklos Szeredi if ((acc & NFSD_MAY_OWNER_OVERRIDE) && 21295cc0a840SDavid Howells inode->i_uid == current_fsuid()) 21301da177e4SLinus Torvalds return 0; 21311da177e4SLinus Torvalds 21328837abcaSMiklos Szeredi /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ 2133f419a2e3SAl Viro err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); 21341da177e4SLinus Torvalds 21351da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 21361da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 2137a043226bSJ. Bruce Fields (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || 2138a043226bSJ. Bruce Fields acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) 2139f419a2e3SAl Viro err = inode_permission(inode, MAY_EXEC); 21401da177e4SLinus Torvalds 21411da177e4SLinus Torvalds return err? nfserrno(err) : 0; 21421da177e4SLinus Torvalds } 21431da177e4SLinus Torvalds 21441da177e4SLinus Torvalds void 21451da177e4SLinus Torvalds nfsd_racache_shutdown(void) 21461da177e4SLinus Torvalds { 214754a66e54SJeff Layton struct raparms *raparm, *last_raparm; 214854a66e54SJeff Layton unsigned int i; 214954a66e54SJeff Layton 21501da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 215154a66e54SJeff Layton 215254a66e54SJeff Layton for (i = 0; i < RAPARM_HASH_SIZE; i++) { 215354a66e54SJeff Layton raparm = raparm_hash[i].pb_head; 215454a66e54SJeff Layton while(raparm) { 215554a66e54SJeff Layton last_raparm = raparm; 215654a66e54SJeff Layton raparm = raparm->p_next; 215754a66e54SJeff Layton kfree(last_raparm); 215854a66e54SJeff Layton } 215954a66e54SJeff Layton raparm_hash[i].pb_head = NULL; 216054a66e54SJeff Layton } 21611da177e4SLinus Torvalds } 21621da177e4SLinus Torvalds /* 21631da177e4SLinus Torvalds * Initialize readahead param cache 21641da177e4SLinus Torvalds */ 21651da177e4SLinus Torvalds int 21661da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 21671da177e4SLinus Torvalds { 21681da177e4SLinus Torvalds int i; 2169fce1456aSGreg Banks int j = 0; 2170fce1456aSGreg Banks int nperbucket; 217154a66e54SJeff Layton struct raparms **raparm = NULL; 21721da177e4SLinus Torvalds 2173fce1456aSGreg Banks 217454a66e54SJeff Layton if (raparm_hash[0].pb_head) 21751da177e4SLinus Torvalds return 0; 217654a66e54SJeff Layton nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); 217754a66e54SJeff Layton if (nperbucket < 2) 217854a66e54SJeff Layton nperbucket = 2; 217954a66e54SJeff Layton cache_size = nperbucket * RAPARM_HASH_SIZE; 21804b3bb06bSYan Burman 21814b3bb06bSYan Burman dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); 218254a66e54SJeff Layton 2183fce1456aSGreg Banks for (i = 0; i < RAPARM_HASH_SIZE; i++) { 2184fce1456aSGreg Banks spin_lock_init(&raparm_hash[i].pb_lock); 218554a66e54SJeff Layton 218654a66e54SJeff Layton raparm = &raparm_hash[i].pb_head; 218754a66e54SJeff Layton for (j = 0; j < nperbucket; j++) { 218854a66e54SJeff Layton *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); 218954a66e54SJeff Layton if (!*raparm) 219054a66e54SJeff Layton goto out_nomem; 219154a66e54SJeff Layton raparm = &(*raparm)->p_next; 2192fce1456aSGreg Banks } 219354a66e54SJeff Layton *raparm = NULL; 21941da177e4SLinus Torvalds } 21954b3bb06bSYan Burman 21961da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 21971da177e4SLinus Torvalds return 0; 219854a66e54SJeff Layton 219954a66e54SJeff Layton out_nomem: 220054a66e54SJeff Layton dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); 220154a66e54SJeff Layton nfsd_racache_shutdown(); 220254a66e54SJeff Layton return -ENOMEM; 22031da177e4SLinus Torvalds } 2204a257cdd0SAndreas Gruenbacher 2205a257cdd0SAndreas Gruenbacher #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 2206a257cdd0SAndreas Gruenbacher struct posix_acl * 2207a257cdd0SAndreas Gruenbacher nfsd_get_posix_acl(struct svc_fh *fhp, int type) 2208a257cdd0SAndreas Gruenbacher { 2209a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2210a257cdd0SAndreas Gruenbacher char *name; 2211a257cdd0SAndreas Gruenbacher void *value = NULL; 2212a257cdd0SAndreas Gruenbacher ssize_t size; 2213a257cdd0SAndreas Gruenbacher struct posix_acl *acl; 2214a257cdd0SAndreas Gruenbacher 22155be196e5SChristoph Hellwig if (!IS_POSIXACL(inode)) 2216a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 22175be196e5SChristoph Hellwig 2218a257cdd0SAndreas Gruenbacher switch (type) { 2219a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2220334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2221a257cdd0SAndreas Gruenbacher break; 2222a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2223334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2224a257cdd0SAndreas Gruenbacher break; 2225a257cdd0SAndreas Gruenbacher default: 2226a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 2227a257cdd0SAndreas Gruenbacher } 2228a257cdd0SAndreas Gruenbacher 22295be196e5SChristoph Hellwig size = nfsd_getxattr(fhp->fh_dentry, name, &value); 22305be196e5SChristoph Hellwig if (size < 0) 22315be196e5SChristoph Hellwig return ERR_PTR(size); 2232a257cdd0SAndreas Gruenbacher 2233a257cdd0SAndreas Gruenbacher acl = posix_acl_from_xattr(value, size); 2234a257cdd0SAndreas Gruenbacher kfree(value); 2235a257cdd0SAndreas Gruenbacher return acl; 2236a257cdd0SAndreas Gruenbacher } 2237a257cdd0SAndreas Gruenbacher 2238a257cdd0SAndreas Gruenbacher int 2239a257cdd0SAndreas Gruenbacher nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) 2240a257cdd0SAndreas Gruenbacher { 2241a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2242a257cdd0SAndreas Gruenbacher char *name; 2243a257cdd0SAndreas Gruenbacher void *value = NULL; 2244a257cdd0SAndreas Gruenbacher size_t size; 2245a257cdd0SAndreas Gruenbacher int error; 2246a257cdd0SAndreas Gruenbacher 2247acfa4380SAl Viro if (!IS_POSIXACL(inode) || 2248a257cdd0SAndreas Gruenbacher !inode->i_op->setxattr || !inode->i_op->removexattr) 2249a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2250a257cdd0SAndreas Gruenbacher switch(type) { 2251a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2252334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2253a257cdd0SAndreas Gruenbacher break; 2254a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2255334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2256a257cdd0SAndreas Gruenbacher break; 2257a257cdd0SAndreas Gruenbacher default: 2258a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2259a257cdd0SAndreas Gruenbacher } 2260a257cdd0SAndreas Gruenbacher 2261a257cdd0SAndreas Gruenbacher if (acl && acl->a_count) { 2262334a13ecSChristoph Hellwig size = posix_acl_xattr_size(acl->a_count); 2263a257cdd0SAndreas Gruenbacher value = kmalloc(size, GFP_KERNEL); 2264a257cdd0SAndreas Gruenbacher if (!value) 2265a257cdd0SAndreas Gruenbacher return -ENOMEM; 22669ccfc29cSFlorin Malita error = posix_acl_to_xattr(acl, value, size); 22679ccfc29cSFlorin Malita if (error < 0) 2268a257cdd0SAndreas Gruenbacher goto getout; 22699ccfc29cSFlorin Malita size = error; 2270a257cdd0SAndreas Gruenbacher } else 2271a257cdd0SAndreas Gruenbacher size = 0; 2272a257cdd0SAndreas Gruenbacher 227318f335afSDave Hansen error = mnt_want_write(fhp->fh_export->ex_path.mnt); 227418f335afSDave Hansen if (error) 227518f335afSDave Hansen goto getout; 2276a257cdd0SAndreas Gruenbacher if (size) 22775be196e5SChristoph Hellwig error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); 2278a257cdd0SAndreas Gruenbacher else { 2279a257cdd0SAndreas Gruenbacher if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) 2280a257cdd0SAndreas Gruenbacher error = 0; 2281a257cdd0SAndreas Gruenbacher else { 22825be196e5SChristoph Hellwig error = vfs_removexattr(fhp->fh_dentry, name); 2283a257cdd0SAndreas Gruenbacher if (error == -ENODATA) 2284a257cdd0SAndreas Gruenbacher error = 0; 2285a257cdd0SAndreas Gruenbacher } 2286a257cdd0SAndreas Gruenbacher } 228718f335afSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 2288a257cdd0SAndreas Gruenbacher 2289a257cdd0SAndreas Gruenbacher getout: 2290a257cdd0SAndreas Gruenbacher kfree(value); 2291a257cdd0SAndreas Gruenbacher return error; 2292a257cdd0SAndreas Gruenbacher } 2293a257cdd0SAndreas Gruenbacher #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ 2294