11da177e4SLinus Torvalds #define MSNFS /* HACK HACK */ 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * linux/fs/nfsd/vfs.c 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * File operations used by nfsd. Some of these have been ripped from 61da177e4SLinus Torvalds * other parts of the kernel because they weren't exported, others 71da177e4SLinus Torvalds * are partial duplicates with added or changed functionality. 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * Note that several functions dget() the dentry upon which they want 101da177e4SLinus Torvalds * to act, most notably those that create directory entries. Response 111da177e4SLinus Torvalds * dentry's are dput()'d if necessary in the release callback. 121da177e4SLinus Torvalds * So if you notice code paths that apparently fail to dput() the 131da177e4SLinus Torvalds * dentry, don't worry--they have been taken care of. 141da177e4SLinus Torvalds * 151da177e4SLinus Torvalds * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> 161da177e4SLinus Torvalds * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> 171da177e4SLinus Torvalds */ 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds #include <linux/string.h> 201da177e4SLinus Torvalds #include <linux/time.h> 211da177e4SLinus Torvalds #include <linux/errno.h> 221da177e4SLinus Torvalds #include <linux/fs.h> 231da177e4SLinus Torvalds #include <linux/file.h> 241da177e4SLinus Torvalds #include <linux/mount.h> 251da177e4SLinus Torvalds #include <linux/major.h> 26d6b29d7cSJens Axboe #include <linux/splice.h> 271da177e4SLinus Torvalds #include <linux/proc_fs.h> 281da177e4SLinus Torvalds #include <linux/stat.h> 291da177e4SLinus Torvalds #include <linux/fcntl.h> 301da177e4SLinus Torvalds #include <linux/net.h> 311da177e4SLinus Torvalds #include <linux/unistd.h> 321da177e4SLinus Torvalds #include <linux/slab.h> 331da177e4SLinus Torvalds #include <linux/pagemap.h> 341da177e4SLinus Torvalds #include <linux/in.h> 351da177e4SLinus Torvalds #include <linux/module.h> 361da177e4SLinus Torvalds #include <linux/namei.h> 371da177e4SLinus Torvalds #include <linux/vfs.h> 381da177e4SLinus Torvalds #include <linux/delay.h> 391da177e4SLinus Torvalds #include <linux/sunrpc/svc.h> 401da177e4SLinus Torvalds #include <linux/nfsd/nfsd.h> 411da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 421da177e4SLinus Torvalds #include <linux/nfs3.h> 431da177e4SLinus Torvalds #include <linux/nfsd/xdr3.h> 441da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 451da177e4SLinus Torvalds #include <linux/nfsd/nfsfh.h> 461da177e4SLinus Torvalds #include <linux/quotaops.h> 470eeca283SRobert Love #include <linux/fsnotify.h> 481da177e4SLinus Torvalds #include <linux/posix_acl.h> 491da177e4SLinus Torvalds #include <linux/posix_acl_xattr.h> 501da177e4SLinus Torvalds #include <linux/xattr.h> 515be196e5SChristoph Hellwig #ifdef CONFIG_NFSD_V4 521da177e4SLinus Torvalds #include <linux/nfs4.h> 531da177e4SLinus Torvalds #include <linux/nfs4_acl.h> 541da177e4SLinus Torvalds #include <linux/nfsd_idmap.h> 551da177e4SLinus Torvalds #include <linux/security.h> 561da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V4 */ 57fce1456aSGreg Banks #include <linux/jhash.h> 5814dba533SMimi Zohar #include <linux/ima.h> 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds #include <asm/uaccess.h> 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds #define NFSDDBG_FACILITY NFSDDBG_FILEOP 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds /* 661da177e4SLinus Torvalds * This is a cache of readahead params that help us choose the proper 671da177e4SLinus Torvalds * readahead strategy. Initially, we set all readahead parameters to 0 681da177e4SLinus Torvalds * and let the VFS handle things. 691da177e4SLinus Torvalds * If you increase the number of cached files very much, you'll need to 701da177e4SLinus Torvalds * add a hash table here. 711da177e4SLinus Torvalds */ 721da177e4SLinus Torvalds struct raparms { 731da177e4SLinus Torvalds struct raparms *p_next; 741da177e4SLinus Torvalds unsigned int p_count; 751da177e4SLinus Torvalds ino_t p_ino; 761da177e4SLinus Torvalds dev_t p_dev; 771da177e4SLinus Torvalds int p_set; 781da177e4SLinus Torvalds struct file_ra_state p_ra; 79fce1456aSGreg Banks unsigned int p_hindex; 801da177e4SLinus Torvalds }; 811da177e4SLinus Torvalds 82fce1456aSGreg Banks struct raparm_hbucket { 83fce1456aSGreg Banks struct raparms *pb_head; 84fce1456aSGreg Banks spinlock_t pb_lock; 85fce1456aSGreg Banks } ____cacheline_aligned_in_smp; 86fce1456aSGreg Banks 87fce1456aSGreg Banks #define RAPARM_HASH_BITS 4 88fce1456aSGreg Banks #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) 89fce1456aSGreg Banks #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) 90fce1456aSGreg Banks static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; 911da177e4SLinus Torvalds 923c394ddaSSteve Dickson static inline int 933c394ddaSSteve Dickson nfsd_v4client(struct svc_rqst *rq) 943c394ddaSSteve Dickson { 953c394ddaSSteve Dickson return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4; 963c394ddaSSteve Dickson } 973c394ddaSSteve Dickson 981da177e4SLinus Torvalds /* 991da177e4SLinus Torvalds * Called from nfsd_lookup and encode_dirent. Check if we have crossed 1001da177e4SLinus Torvalds * a mount point. 101e0bb89efSJ.Bruce Fields * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, 1021da177e4SLinus Torvalds * or nfs_ok having possibly changed *dpp and *expp 1031da177e4SLinus Torvalds */ 1041da177e4SLinus Torvalds int 1051da177e4SLinus Torvalds nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 1061da177e4SLinus Torvalds struct svc_export **expp) 1071da177e4SLinus Torvalds { 1081da177e4SLinus Torvalds struct svc_export *exp = *expp, *exp2 = NULL; 1091da177e4SLinus Torvalds struct dentry *dentry = *dpp; 11091c9fa8fSAl Viro struct path path = {.mnt = mntget(exp->ex_path.mnt), 11191c9fa8fSAl Viro .dentry = dget(dentry)}; 1126264d69dSAl Viro int err = 0; 1131da177e4SLinus Torvalds 1149393bd07SAl Viro while (d_mountpoint(path.dentry) && follow_down(&path)) 11591c9fa8fSAl Viro ; 1161da177e4SLinus Torvalds 11791c9fa8fSAl Viro exp2 = rqst_exp_get_by_name(rqstp, &path); 1181da177e4SLinus Torvalds if (IS_ERR(exp2)) { 119a1033be7SNeil Brown if (PTR_ERR(exp2) != -ENOENT) 1201da177e4SLinus Torvalds err = PTR_ERR(exp2); 12191c9fa8fSAl Viro path_put(&path); 1221da177e4SLinus Torvalds goto out; 1231da177e4SLinus Torvalds } 1243c394ddaSSteve Dickson if (nfsd_v4client(rqstp) || 1253c394ddaSSteve Dickson (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { 1261da177e4SLinus Torvalds /* successfully crossed mount point */ 1271644ccc8SAl Viro /* 12891c9fa8fSAl Viro * This is subtle: path.dentry is *not* on path.mnt 12991c9fa8fSAl Viro * at this point. The only reason we are safe is that 13091c9fa8fSAl Viro * original mnt is pinned down by exp, so we should 13191c9fa8fSAl Viro * put path *before* putting exp 1321644ccc8SAl Viro */ 13391c9fa8fSAl Viro *dpp = path.dentry; 13491c9fa8fSAl Viro path.dentry = dentry; 1351644ccc8SAl Viro *expp = exp2; 13691c9fa8fSAl Viro exp2 = exp; 1371da177e4SLinus Torvalds } 13891c9fa8fSAl Viro path_put(&path); 13991c9fa8fSAl Viro exp_put(exp2); 1401da177e4SLinus Torvalds out: 1411da177e4SLinus Torvalds return err; 1421da177e4SLinus Torvalds } 1431da177e4SLinus Torvalds 1446264d69dSAl Viro __be32 1456c0a654dSJ. Bruce Fields nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, 1465a022fc8SChuck Lever const char *name, unsigned int len, 1476c0a654dSJ. Bruce Fields struct svc_export **exp_ret, struct dentry **dentry_ret) 1481da177e4SLinus Torvalds { 1491da177e4SLinus Torvalds struct svc_export *exp; 1501da177e4SLinus Torvalds struct dentry *dparent; 1511da177e4SLinus Torvalds struct dentry *dentry; 1526264d69dSAl Viro __be32 err; 1536264d69dSAl Viro int host_err; 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds /* Obtain dentry and export. */ 1588837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 1591da177e4SLinus Torvalds if (err) 1601da177e4SLinus Torvalds return err; 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds dparent = fhp->fh_dentry; 1631da177e4SLinus Torvalds exp = fhp->fh_export; 1641da177e4SLinus Torvalds exp_get(exp); 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds /* Lookup the name, but don't follow links */ 1671da177e4SLinus Torvalds if (isdotent(name, len)) { 1681da177e4SLinus Torvalds if (len==1) 1691da177e4SLinus Torvalds dentry = dget(dparent); 17054775491SJan Blunck else if (dparent != exp->ex_path.dentry) 1711da177e4SLinus Torvalds dentry = dget_parent(dparent); 17254775491SJan Blunck else if (!EX_NOHIDE(exp)) 1731da177e4SLinus Torvalds dentry = dget(dparent); /* .. == . just like at / */ 1741da177e4SLinus Torvalds else { 1751da177e4SLinus Torvalds /* checking mountpoint crossing is very different when stepping up */ 1761da177e4SLinus Torvalds struct svc_export *exp2 = NULL; 1771da177e4SLinus Torvalds struct dentry *dp; 178e64c390cSAl Viro struct path path = {.mnt = mntget(exp->ex_path.mnt), 179e64c390cSAl Viro .dentry = dget(dparent)}; 1801da177e4SLinus Torvalds 181e64c390cSAl Viro while (path.dentry == path.mnt->mnt_root && 182bab77ebfSAl Viro follow_up(&path)) 183e64c390cSAl Viro ; 184e64c390cSAl Viro dp = dget_parent(path.dentry); 185e64c390cSAl Viro dput(path.dentry); 186e64c390cSAl Viro path.dentry = dp; 187e64c390cSAl Viro 188e64c390cSAl Viro exp2 = rqst_exp_parent(rqstp, &path); 1892d3bb252SJ. Bruce Fields if (PTR_ERR(exp2) == -ENOENT) { 1902d3bb252SJ. Bruce Fields dentry = dget(dparent); 1912d3bb252SJ. Bruce Fields } else if (IS_ERR(exp2)) { 1926264d69dSAl Viro host_err = PTR_ERR(exp2); 193e64c390cSAl Viro path_put(&path); 1941da177e4SLinus Torvalds goto out_nfserr; 1951da177e4SLinus Torvalds } else { 196e64c390cSAl Viro dentry = dget(path.dentry); 1971da177e4SLinus Torvalds exp_put(exp); 1981da177e4SLinus Torvalds exp = exp2; 1991da177e4SLinus Torvalds } 200e64c390cSAl Viro path_put(&path); 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds } else { 2031da177e4SLinus Torvalds fh_lock(fhp); 2041da177e4SLinus Torvalds dentry = lookup_one_len(name, dparent, len); 2056264d69dSAl Viro host_err = PTR_ERR(dentry); 2061da177e4SLinus Torvalds if (IS_ERR(dentry)) 2071da177e4SLinus Torvalds goto out_nfserr; 2081da177e4SLinus Torvalds /* 2091da177e4SLinus Torvalds * check if we have crossed a mount point ... 2101da177e4SLinus Torvalds */ 2111da177e4SLinus Torvalds if (d_mountpoint(dentry)) { 2126264d69dSAl Viro if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 2131da177e4SLinus Torvalds dput(dentry); 2141da177e4SLinus Torvalds goto out_nfserr; 2151da177e4SLinus Torvalds } 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds } 2186c0a654dSJ. Bruce Fields *dentry_ret = dentry; 2196c0a654dSJ. Bruce Fields *exp_ret = exp; 2206c0a654dSJ. Bruce Fields return 0; 2216c0a654dSJ. Bruce Fields 2226c0a654dSJ. Bruce Fields out_nfserr: 2236c0a654dSJ. Bruce Fields exp_put(exp); 2246c0a654dSJ. Bruce Fields return nfserrno(host_err); 2256c0a654dSJ. Bruce Fields } 2266c0a654dSJ. Bruce Fields 2276c0a654dSJ. Bruce Fields /* 2286c0a654dSJ. Bruce Fields * Look up one component of a pathname. 2296c0a654dSJ. Bruce Fields * N.B. After this call _both_ fhp and resfh need an fh_put 2306c0a654dSJ. Bruce Fields * 2316c0a654dSJ. Bruce Fields * If the lookup would cross a mountpoint, and the mounted filesystem 2326c0a654dSJ. Bruce Fields * is exported to the client with NFSEXP_NOHIDE, then the lookup is 2336c0a654dSJ. Bruce Fields * accepted as it stands and the mounted directory is 2346c0a654dSJ. Bruce Fields * returned. Otherwise the covered directory is returned. 2356c0a654dSJ. Bruce Fields * NOTE: this mountpoint crossing is not supported properly by all 2366c0a654dSJ. Bruce Fields * clients and is explicitly disallowed for NFSv3 2376c0a654dSJ. Bruce Fields * NeilBrown <neilb@cse.unsw.edu.au> 2386c0a654dSJ. Bruce Fields */ 2396c0a654dSJ. Bruce Fields __be32 2406c0a654dSJ. Bruce Fields nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 2415a022fc8SChuck Lever unsigned int len, struct svc_fh *resfh) 2426c0a654dSJ. Bruce Fields { 2436c0a654dSJ. Bruce Fields struct svc_export *exp; 2446c0a654dSJ. Bruce Fields struct dentry *dentry; 2456c0a654dSJ. Bruce Fields __be32 err; 2466c0a654dSJ. Bruce Fields 2476c0a654dSJ. Bruce Fields err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); 2486c0a654dSJ. Bruce Fields if (err) 2496c0a654dSJ. Bruce Fields return err; 25032c1eb0cSAndy Adamson err = check_nfsd_access(exp, rqstp); 25132c1eb0cSAndy Adamson if (err) 25232c1eb0cSAndy Adamson goto out; 2531da177e4SLinus Torvalds /* 2541da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2551da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2561da177e4SLinus Torvalds */ 2571da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2581da177e4SLinus Torvalds if (!err && !dentry->d_inode) 2591da177e4SLinus Torvalds err = nfserr_noent; 26032c1eb0cSAndy Adamson out: 2611da177e4SLinus Torvalds dput(dentry); 2621da177e4SLinus Torvalds exp_put(exp); 2631da177e4SLinus Torvalds return err; 2641da177e4SLinus Torvalds } 2651da177e4SLinus Torvalds 2666c0a654dSJ. Bruce Fields 2671da177e4SLinus Torvalds /* 2681da177e4SLinus Torvalds * Set various file attributes. 2691da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 2701da177e4SLinus Torvalds */ 2716264d69dSAl Viro __be32 2721da177e4SLinus Torvalds nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 2731da177e4SLinus Torvalds int check_guard, time_t guardtime) 2741da177e4SLinus Torvalds { 2751da177e4SLinus Torvalds struct dentry *dentry; 2761da177e4SLinus Torvalds struct inode *inode; 2778837abcaSMiklos Szeredi int accmode = NFSD_MAY_SATTR; 2781da177e4SLinus Torvalds int ftype = 0; 2796264d69dSAl Viro __be32 err; 2806264d69dSAl Viro int host_err; 2811da177e4SLinus Torvalds int size_change = 0; 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) 2848837abcaSMiklos Szeredi accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; 2851da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) 2861da177e4SLinus Torvalds ftype = S_IFREG; 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds /* Get inode */ 2891da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 29015b7a1b8SNeilBrown if (err) 2911da177e4SLinus Torvalds goto out; 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds dentry = fhp->fh_dentry; 2941da177e4SLinus Torvalds inode = dentry->d_inode; 2951da177e4SLinus Torvalds 29615b7a1b8SNeilBrown /* Ignore any mode updates on symlinks */ 29715b7a1b8SNeilBrown if (S_ISLNK(inode->i_mode)) 29815b7a1b8SNeilBrown iap->ia_valid &= ~ATTR_MODE; 29915b7a1b8SNeilBrown 30015b7a1b8SNeilBrown if (!iap->ia_valid) 30115b7a1b8SNeilBrown goto out; 30215b7a1b8SNeilBrown 3039c85fca5SChristoph Hellwig /* 3049c85fca5SChristoph Hellwig * NFSv2 does not differentiate between "set-[ac]time-to-now" 3051da177e4SLinus Torvalds * which only requires access, and "set-[ac]time-to-X" which 3061da177e4SLinus Torvalds * requires ownership. 3071da177e4SLinus Torvalds * So if it looks like it might be "set both to the same time which 3081da177e4SLinus Torvalds * is close to now", and if inode_change_ok fails, then we 3091da177e4SLinus Torvalds * convert to "set to now" instead of "set to explicit time" 3101da177e4SLinus Torvalds * 3111da177e4SLinus Torvalds * We only call inode_change_ok as the last test as technically 3121da177e4SLinus Torvalds * it is not an interface that we should be using. It is only 3131da177e4SLinus Torvalds * valid if the filesystem does not define it's own i_op->setattr. 3141da177e4SLinus Torvalds */ 3151da177e4SLinus Torvalds #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) 3161da177e4SLinus Torvalds #define MAX_TOUCH_TIME_ERROR (30*60) 3179c85fca5SChristoph Hellwig if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && 3189c85fca5SChristoph Hellwig iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { 3199c85fca5SChristoph Hellwig /* 3209c85fca5SChristoph Hellwig * Looks probable. 3219c85fca5SChristoph Hellwig * 3229c85fca5SChristoph Hellwig * Now just make sure time is in the right ballpark. 3239c85fca5SChristoph Hellwig * Solaris, at least, doesn't seem to care what the time 3249c85fca5SChristoph Hellwig * request is. We require it be within 30 minutes of now. 3251da177e4SLinus Torvalds */ 3261da177e4SLinus Torvalds time_t delta = iap->ia_atime.tv_sec - get_seconds(); 3279c85fca5SChristoph Hellwig if (delta < 0) 3289c85fca5SChristoph Hellwig delta = -delta; 3291da177e4SLinus Torvalds if (delta < MAX_TOUCH_TIME_ERROR && 3301da177e4SLinus Torvalds inode_change_ok(inode, iap) != 0) { 3319c85fca5SChristoph Hellwig /* 3329c85fca5SChristoph Hellwig * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. 3339c85fca5SChristoph Hellwig * This will cause notify_change to set these times 3349c85fca5SChristoph Hellwig * to "now" 3351da177e4SLinus Torvalds */ 3361da177e4SLinus Torvalds iap->ia_valid &= ~BOTH_TIME_SET; 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds 3409c85fca5SChristoph Hellwig /* 3419c85fca5SChristoph Hellwig * The size case is special. 3429c85fca5SChristoph Hellwig * It changes the file as well as the attributes. 3439c85fca5SChristoph Hellwig */ 3441da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) { 3451da177e4SLinus Torvalds if (iap->ia_size < inode->i_size) { 3468837abcaSMiklos Szeredi err = nfsd_permission(rqstp, fhp->fh_export, dentry, 3478837abcaSMiklos Szeredi NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE); 3481da177e4SLinus Torvalds if (err) 3491da177e4SLinus Torvalds goto out; 3501da177e4SLinus Torvalds } 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds /* 3531da177e4SLinus Torvalds * If we are changing the size of the file, then 3541da177e4SLinus Torvalds * we need to break all leases. 3551da177e4SLinus Torvalds */ 3566264d69dSAl Viro host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK); 3576264d69dSAl Viro if (host_err == -EWOULDBLOCK) 3586264d69dSAl Viro host_err = -ETIMEDOUT; 3596264d69dSAl Viro if (host_err) /* ENOMEM or EWOULDBLOCK */ 3601da177e4SLinus Torvalds goto out_nfserr; 3611da177e4SLinus Torvalds 3626264d69dSAl Viro host_err = get_write_access(inode); 3636264d69dSAl Viro if (host_err) 3641da177e4SLinus Torvalds goto out_nfserr; 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds size_change = 1; 3676264d69dSAl Viro host_err = locks_verify_truncate(inode, NULL, iap->ia_size); 3686264d69dSAl Viro if (host_err) { 3691da177e4SLinus Torvalds put_write_access(inode); 3701da177e4SLinus Torvalds goto out_nfserr; 3711da177e4SLinus Torvalds } 37290c0af05SJan Kara vfs_dq_init(inode); 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds 375ca456252SJeff Layton /* sanitize the mode change */ 3761da177e4SLinus Torvalds if (iap->ia_valid & ATTR_MODE) { 3771da177e4SLinus Torvalds iap->ia_mode &= S_IALLUGO; 378dee3209dSJeff Layton iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); 3791da177e4SLinus Torvalds } 380ca456252SJeff Layton 381ca456252SJeff Layton /* Revoke setuid/setgid on chown */ 3820953e620SSachin S. Prabhu if (!S_ISDIR(inode->i_mode) && 3830953e620SSachin S. Prabhu (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) || 3840953e620SSachin S. Prabhu ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) { 385ca456252SJeff Layton iap->ia_valid |= ATTR_KILL_PRIV; 386ca456252SJeff Layton if (iap->ia_valid & ATTR_MODE) { 387ca456252SJeff Layton /* we're setting mode too, just clear the s*id bits */ 388ca456252SJeff Layton iap->ia_mode &= ~S_ISUID; 389ca456252SJeff Layton if (iap->ia_mode & S_IXGRP) 3908a0ce7d9SJeff Layton iap->ia_mode &= ~S_ISGID; 3918a0ce7d9SJeff Layton } else { 392ca456252SJeff Layton /* set ATTR_KILL_* bits and let VFS handle it */ 393ca456252SJeff Layton iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); 394ca456252SJeff Layton } 3958a0ce7d9SJeff Layton } 3961da177e4SLinus Torvalds 3971da177e4SLinus Torvalds /* Change the attributes. */ 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds err = nfserr_notsync; 4021da177e4SLinus Torvalds if (!check_guard || guardtime == inode->i_ctime.tv_sec) { 4031da177e4SLinus Torvalds fh_lock(fhp); 4046264d69dSAl Viro host_err = notify_change(dentry, iap); 4056264d69dSAl Viro err = nfserrno(host_err); 4061da177e4SLinus Torvalds fh_unlock(fhp); 4071da177e4SLinus Torvalds } 4081da177e4SLinus Torvalds if (size_change) 4091da177e4SLinus Torvalds put_write_access(inode); 4101da177e4SLinus Torvalds if (!err) 4111da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 4121da177e4SLinus Torvalds write_inode_now(inode, 1); 4131da177e4SLinus Torvalds out: 4141da177e4SLinus Torvalds return err; 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds out_nfserr: 4176264d69dSAl Viro err = nfserrno(host_err); 4181da177e4SLinus Torvalds goto out; 4191da177e4SLinus Torvalds } 4201da177e4SLinus Torvalds 4215be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V2_ACL) || \ 4225be196e5SChristoph Hellwig defined(CONFIG_NFSD_V3_ACL) || \ 4235be196e5SChristoph Hellwig defined(CONFIG_NFSD_V4) 4245be196e5SChristoph Hellwig static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) 4255be196e5SChristoph Hellwig { 4265be196e5SChristoph Hellwig ssize_t buflen; 4276c6a426fSKrishna Kumar ssize_t ret; 4281da177e4SLinus Torvalds 4295be196e5SChristoph Hellwig buflen = vfs_getxattr(dentry, key, NULL, 0); 4305be196e5SChristoph Hellwig if (buflen <= 0) 4315be196e5SChristoph Hellwig return buflen; 4325be196e5SChristoph Hellwig 4335be196e5SChristoph Hellwig *buf = kmalloc(buflen, GFP_KERNEL); 4345be196e5SChristoph Hellwig if (!*buf) 4355be196e5SChristoph Hellwig return -ENOMEM; 4365be196e5SChristoph Hellwig 4376c6a426fSKrishna Kumar ret = vfs_getxattr(dentry, key, *buf, buflen); 4386c6a426fSKrishna Kumar if (ret < 0) 4396c6a426fSKrishna Kumar kfree(*buf); 4406c6a426fSKrishna Kumar return ret; 4415be196e5SChristoph Hellwig } 4425be196e5SChristoph Hellwig #endif 4435be196e5SChristoph Hellwig 4445be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V4) 4451da177e4SLinus Torvalds static int 4461da177e4SLinus Torvalds set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) 4471da177e4SLinus Torvalds { 4481da177e4SLinus Torvalds int len; 4491da177e4SLinus Torvalds size_t buflen; 4501da177e4SLinus Torvalds char *buf = NULL; 4511da177e4SLinus Torvalds int error = 0; 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds buflen = posix_acl_xattr_size(pacl->a_count); 4541da177e4SLinus Torvalds buf = kmalloc(buflen, GFP_KERNEL); 4551da177e4SLinus Torvalds error = -ENOMEM; 4561da177e4SLinus Torvalds if (buf == NULL) 4571da177e4SLinus Torvalds goto out; 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds len = posix_acl_to_xattr(pacl, buf, buflen); 4601da177e4SLinus Torvalds if (len < 0) { 4611da177e4SLinus Torvalds error = len; 4621da177e4SLinus Torvalds goto out; 4631da177e4SLinus Torvalds } 4641da177e4SLinus Torvalds 4655be196e5SChristoph Hellwig error = vfs_setxattr(dentry, key, buf, len, 0); 4661da177e4SLinus Torvalds out: 4671da177e4SLinus Torvalds kfree(buf); 4681da177e4SLinus Torvalds return error; 4691da177e4SLinus Torvalds } 4701da177e4SLinus Torvalds 4716264d69dSAl Viro __be32 4721da177e4SLinus Torvalds nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, 4731da177e4SLinus Torvalds struct nfs4_acl *acl) 4741da177e4SLinus Torvalds { 4756264d69dSAl Viro __be32 error; 4766264d69dSAl Viro int host_error; 4771da177e4SLinus Torvalds struct dentry *dentry; 4781da177e4SLinus Torvalds struct inode *inode; 4791da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 4801da177e4SLinus Torvalds unsigned int flags = 0; 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds /* Get inode */ 4838837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); 4841da177e4SLinus Torvalds if (error) 4854b2ca38aSJ. Bruce Fields return error; 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds dentry = fhp->fh_dentry; 4881da177e4SLinus Torvalds inode = dentry->d_inode; 4891da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) 4901da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 4911da177e4SLinus Torvalds 4926264d69dSAl Viro host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); 4936264d69dSAl Viro if (host_error == -EINVAL) { 4944b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 4956264d69dSAl Viro } else if (host_error < 0) 4961da177e4SLinus Torvalds goto out_nfserr; 4971da177e4SLinus Torvalds 4986264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); 4996264d69dSAl Viro if (host_error < 0) 5004b2ca38aSJ. Bruce Fields goto out_release; 5011da177e4SLinus Torvalds 5024b2ca38aSJ. Bruce Fields if (S_ISDIR(inode->i_mode)) 5036264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); 5041da177e4SLinus Torvalds 5054b2ca38aSJ. Bruce Fields out_release: 5061da177e4SLinus Torvalds posix_acl_release(pacl); 5071da177e4SLinus Torvalds posix_acl_release(dpacl); 5081da177e4SLinus Torvalds out_nfserr: 509f34f9242SJ. Bruce Fields if (host_error == -EOPNOTSUPP) 5104b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 511f34f9242SJ. Bruce Fields else 5124b2ca38aSJ. Bruce Fields return nfserrno(host_error); 5131da177e4SLinus Torvalds } 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds static struct posix_acl * 5161da177e4SLinus Torvalds _get_posix_acl(struct dentry *dentry, char *key) 5171da177e4SLinus Torvalds { 5185be196e5SChristoph Hellwig void *buf = NULL; 5191da177e4SLinus Torvalds struct posix_acl *pacl = NULL; 5205be196e5SChristoph Hellwig int buflen; 5211da177e4SLinus Torvalds 5225be196e5SChristoph Hellwig buflen = nfsd_getxattr(dentry, key, &buf); 5235be196e5SChristoph Hellwig if (!buflen) 5245be196e5SChristoph Hellwig buflen = -ENODATA; 5255be196e5SChristoph Hellwig if (buflen <= 0) 5265be196e5SChristoph Hellwig return ERR_PTR(buflen); 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds pacl = posix_acl_from_xattr(buf, buflen); 5291da177e4SLinus Torvalds kfree(buf); 5301da177e4SLinus Torvalds return pacl; 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds int 5341da177e4SLinus Torvalds nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) 5351da177e4SLinus Torvalds { 5361da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 5371da177e4SLinus Torvalds int error = 0; 5381da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 5391da177e4SLinus Torvalds unsigned int flags = 0; 5401da177e4SLinus Torvalds 5419a59f452SChristoph Hellwig pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); 5421da177e4SLinus Torvalds if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) 5431da177e4SLinus Torvalds pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 5441da177e4SLinus Torvalds if (IS_ERR(pacl)) { 5451da177e4SLinus Torvalds error = PTR_ERR(pacl); 5461da177e4SLinus Torvalds pacl = NULL; 5471da177e4SLinus Torvalds goto out; 5481da177e4SLinus Torvalds } 5491da177e4SLinus Torvalds 5501da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) { 5519a59f452SChristoph Hellwig dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); 5521da177e4SLinus Torvalds if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) 5531da177e4SLinus Torvalds dpacl = NULL; 5541da177e4SLinus Torvalds else if (IS_ERR(dpacl)) { 5551da177e4SLinus Torvalds error = PTR_ERR(dpacl); 5561da177e4SLinus Torvalds dpacl = NULL; 5571da177e4SLinus Torvalds goto out; 5581da177e4SLinus Torvalds } 5591da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5601da177e4SLinus Torvalds } 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvalds *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); 5631da177e4SLinus Torvalds if (IS_ERR(*acl)) { 5641da177e4SLinus Torvalds error = PTR_ERR(*acl); 5651da177e4SLinus Torvalds *acl = NULL; 5661da177e4SLinus Torvalds } 5671da177e4SLinus Torvalds out: 5681da177e4SLinus Torvalds posix_acl_release(pacl); 5691da177e4SLinus Torvalds posix_acl_release(dpacl); 5701da177e4SLinus Torvalds return error; 5711da177e4SLinus Torvalds } 5721da177e4SLinus Torvalds 5731da177e4SLinus Torvalds #endif /* defined(CONFIG_NFS_V4) */ 5741da177e4SLinus Torvalds 5751da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 5761da177e4SLinus Torvalds /* 5771da177e4SLinus Torvalds * Check server access rights to a file system object 5781da177e4SLinus Torvalds */ 5791da177e4SLinus Torvalds struct accessmap { 5801da177e4SLinus Torvalds u32 access; 5811da177e4SLinus Torvalds int how; 5821da177e4SLinus Torvalds }; 5831da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 5848837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 5858837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 5868837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, 5878837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvalds { 0, 0 } 5901da177e4SLinus Torvalds }; 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 5938837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 5948837abcaSMiklos Szeredi { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, 5958837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, 5968837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, 5978837abcaSMiklos Szeredi { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds { 0, 0 } 6001da177e4SLinus Torvalds }; 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 6031da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 6041da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 6051da177e4SLinus Torvalds * (which really, the server doesn't care about). So 6061da177e4SLinus Torvalds * We provide simple access checking for them, looking 6071da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 6081da177e4SLinus Torvalds * filesystem checks 6091da177e4SLinus Torvalds */ 6108837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6118837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6128837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6138837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds { 0, 0 } 6161da177e4SLinus Torvalds }; 6171da177e4SLinus Torvalds 6186264d69dSAl Viro __be32 6191da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 6201da177e4SLinus Torvalds { 6211da177e4SLinus Torvalds struct accessmap *map; 6221da177e4SLinus Torvalds struct svc_export *export; 6231da177e4SLinus Torvalds struct dentry *dentry; 6241da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 6256264d69dSAl Viro __be32 error; 6261da177e4SLinus Torvalds 6278837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 6281da177e4SLinus Torvalds if (error) 6291da177e4SLinus Torvalds goto out; 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds export = fhp->fh_export; 6321da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds if (S_ISREG(dentry->d_inode->i_mode)) 6351da177e4SLinus Torvalds map = nfs3_regaccess; 6361da177e4SLinus Torvalds else if (S_ISDIR(dentry->d_inode->i_mode)) 6371da177e4SLinus Torvalds map = nfs3_diraccess; 6381da177e4SLinus Torvalds else 6391da177e4SLinus Torvalds map = nfs3_anyaccess; 6401da177e4SLinus Torvalds 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds query = *access; 6431da177e4SLinus Torvalds for (; map->access; map++) { 6441da177e4SLinus Torvalds if (map->access & query) { 6456264d69dSAl Viro __be32 err2; 6461da177e4SLinus Torvalds 6471da177e4SLinus Torvalds sresult |= map->access; 6481da177e4SLinus Torvalds 6490ec757dfSJ. Bruce Fields err2 = nfsd_permission(rqstp, export, dentry, map->how); 6501da177e4SLinus Torvalds switch (err2) { 6511da177e4SLinus Torvalds case nfs_ok: 6521da177e4SLinus Torvalds result |= map->access; 6531da177e4SLinus Torvalds break; 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 6561da177e4SLinus Torvalds * rather than an error occurred */ 6571da177e4SLinus Torvalds case nfserr_rofs: 6581da177e4SLinus Torvalds case nfserr_acces: 6591da177e4SLinus Torvalds case nfserr_perm: 6601da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 6611da177e4SLinus Torvalds break; 6621da177e4SLinus Torvalds default: 6631da177e4SLinus Torvalds error = err2; 6641da177e4SLinus Torvalds goto out; 6651da177e4SLinus Torvalds } 6661da177e4SLinus Torvalds } 6671da177e4SLinus Torvalds } 6681da177e4SLinus Torvalds *access = result; 6691da177e4SLinus Torvalds if (supported) 6701da177e4SLinus Torvalds *supported = sresult; 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds out: 6731da177e4SLinus Torvalds return error; 6741da177e4SLinus Torvalds } 6751da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds 6791da177e4SLinus Torvalds /* 6801da177e4SLinus Torvalds * Open an existing file or directory. 6811da177e4SLinus Torvalds * The access argument indicates the type of open (read/write/lock) 6821da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 6831da177e4SLinus Torvalds */ 6846264d69dSAl Viro __be32 6851da177e4SLinus Torvalds nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 6861da177e4SLinus Torvalds int access, struct file **filp) 6871da177e4SLinus Torvalds { 6881da177e4SLinus Torvalds struct dentry *dentry; 6891da177e4SLinus Torvalds struct inode *inode; 6906264d69dSAl Viro int flags = O_RDONLY|O_LARGEFILE; 6916264d69dSAl Viro __be32 err; 6926264d69dSAl Viro int host_err; 6931da177e4SLinus Torvalds 694e0e81739SDavid Howells validate_process_creds(); 695e0e81739SDavid Howells 6961da177e4SLinus Torvalds /* 6971da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 6981da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 6991da177e4SLinus Torvalds * in case a chmod has now revoked permission. 7001da177e4SLinus Torvalds */ 7018837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE); 7021da177e4SLinus Torvalds if (err) 7031da177e4SLinus Torvalds goto out; 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds dentry = fhp->fh_dentry; 7061da177e4SLinus Torvalds inode = dentry->d_inode; 7071da177e4SLinus Torvalds 7081da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 7091da177e4SLinus Torvalds * or any access when mandatory locking enabled 7101da177e4SLinus Torvalds */ 7111da177e4SLinus Torvalds err = nfserr_perm; 7128837abcaSMiklos Szeredi if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE)) 7131da177e4SLinus Torvalds goto out; 7145e7fc436SJ. Bruce Fields /* 7155e7fc436SJ. Bruce Fields * We must ignore files (but only files) which might have mandatory 7165e7fc436SJ. Bruce Fields * locks on them because there is no way to know if the accesser has 7175e7fc436SJ. Bruce Fields * the lock. 7185e7fc436SJ. Bruce Fields */ 7195e7fc436SJ. Bruce Fields if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) 7201da177e4SLinus Torvalds goto out; 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds if (!inode->i_fop) 7231da177e4SLinus Torvalds goto out; 7241da177e4SLinus Torvalds 7251da177e4SLinus Torvalds /* 7261da177e4SLinus Torvalds * Check to see if there are any leases on this file. 7271da177e4SLinus Torvalds * This may block while leases are broken. 7281da177e4SLinus Torvalds */ 7298837abcaSMiklos Szeredi host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? FMODE_WRITE : 0)); 7306264d69dSAl Viro if (host_err == -EWOULDBLOCK) 7316264d69dSAl Viro host_err = -ETIMEDOUT; 7326264d69dSAl Viro if (host_err) /* NOMEM or WOULDBLOCK */ 7331da177e4SLinus Torvalds goto out_nfserr; 7341da177e4SLinus Torvalds 7358837abcaSMiklos Szeredi if (access & NFSD_MAY_WRITE) { 7368837abcaSMiklos Szeredi if (access & NFSD_MAY_READ) 7379ecb6a08SJ. Bruce Fields flags = O_RDWR|O_LARGEFILE; 7389ecb6a08SJ. Bruce Fields else 7391da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 7401da177e4SLinus Torvalds 74190c0af05SJan Kara vfs_dq_init(inode); 7421da177e4SLinus Torvalds } 74354775491SJan Blunck *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt), 744033a666cSDavid Howells flags, current_cred()); 7451da177e4SLinus Torvalds if (IS_ERR(*filp)) 7466264d69dSAl Viro host_err = PTR_ERR(*filp); 7471da177e4SLinus Torvalds out_nfserr: 7486264d69dSAl Viro err = nfserrno(host_err); 7491da177e4SLinus Torvalds out: 750e0e81739SDavid Howells validate_process_creds(); 7511da177e4SLinus Torvalds return err; 7521da177e4SLinus Torvalds } 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds /* 7551da177e4SLinus Torvalds * Close a file. 7561da177e4SLinus Torvalds */ 7571da177e4SLinus Torvalds void 7581da177e4SLinus Torvalds nfsd_close(struct file *filp) 7591da177e4SLinus Torvalds { 7601da177e4SLinus Torvalds fput(filp); 7611da177e4SLinus Torvalds } 7621da177e4SLinus Torvalds 7639a8d248eSJ. Bruce Fields /* 7649a8d248eSJ. Bruce Fields * Sync a file 7659a8d248eSJ. Bruce Fields * As this calls fsync (not fdatasync) there is no need for a write_inode 7669a8d248eSJ. Bruce Fields * after it. 7679a8d248eSJ. Bruce Fields */ 7689a8d248eSJ. Bruce Fields static inline int nfsd_dosync(struct file *filp, struct dentry *dp, 7699a8d248eSJ. Bruce Fields const struct file_operations *fop) 7709a8d248eSJ. Bruce Fields { 7719a8d248eSJ. Bruce Fields struct inode *inode = dp->d_inode; 7729a8d248eSJ. Bruce Fields int (*fsync) (struct file *, struct dentry *, int); 7739a8d248eSJ. Bruce Fields int err; 7749a8d248eSJ. Bruce Fields 7759a8d248eSJ. Bruce Fields err = filemap_fdatawrite(inode->i_mapping); 7769a8d248eSJ. Bruce Fields if (err == 0 && fop && (fsync = fop->fsync)) 7779a8d248eSJ. Bruce Fields err = fsync(filp, dp, 0); 7789a8d248eSJ. Bruce Fields if (err == 0) 7799a8d248eSJ. Bruce Fields err = filemap_fdatawait(inode->i_mapping); 7809a8d248eSJ. Bruce Fields 7819a8d248eSJ. Bruce Fields return err; 7829a8d248eSJ. Bruce Fields } 7839a8d248eSJ. Bruce Fields 784a334de28SDavid Shaw static int 7851da177e4SLinus Torvalds nfsd_sync(struct file *filp) 7861da177e4SLinus Torvalds { 7879a8d248eSJ. Bruce Fields int err; 7889a8d248eSJ. Bruce Fields struct inode *inode = filp->f_path.dentry->d_inode; 7899a8d248eSJ. Bruce Fields dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name); 7909a8d248eSJ. Bruce Fields mutex_lock(&inode->i_mutex); 7919a8d248eSJ. Bruce Fields err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op); 7929a8d248eSJ. Bruce Fields mutex_unlock(&inode->i_mutex); 7939a8d248eSJ. Bruce Fields 7949a8d248eSJ. Bruce Fields return err; 7951da177e4SLinus Torvalds } 7961da177e4SLinus Torvalds 797f193fbabSYAMAMOTO Takashi int 7989a8d248eSJ. Bruce Fields nfsd_sync_dir(struct dentry *dp) 7991da177e4SLinus Torvalds { 8009a8d248eSJ. Bruce Fields return nfsd_dosync(NULL, dp, dp->d_inode->i_fop); 8011da177e4SLinus Torvalds } 8021da177e4SLinus Torvalds 8031da177e4SLinus Torvalds /* 8041da177e4SLinus Torvalds * Obtain the readahead parameters for the file 8051da177e4SLinus Torvalds * specified by (dev, ino). 8061da177e4SLinus Torvalds */ 8071da177e4SLinus Torvalds 8081da177e4SLinus Torvalds static inline struct raparms * 8091da177e4SLinus Torvalds nfsd_get_raparms(dev_t dev, ino_t ino) 8101da177e4SLinus Torvalds { 8111da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 8121da177e4SLinus Torvalds int depth = 0; 813fce1456aSGreg Banks unsigned int hash; 814fce1456aSGreg Banks struct raparm_hbucket *rab; 8151da177e4SLinus Torvalds 816fce1456aSGreg Banks hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; 817fce1456aSGreg Banks rab = &raparm_hash[hash]; 818fce1456aSGreg Banks 819fce1456aSGreg Banks spin_lock(&rab->pb_lock); 820fce1456aSGreg Banks for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { 8211da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 8221da177e4SLinus Torvalds goto found; 8231da177e4SLinus Torvalds depth++; 8241da177e4SLinus Torvalds if (ra->p_count == 0) 8251da177e4SLinus Torvalds frap = rap; 8261da177e4SLinus Torvalds } 8271da177e4SLinus Torvalds depth = nfsdstats.ra_size*11/10; 8281da177e4SLinus Torvalds if (!frap) { 829fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8301da177e4SLinus Torvalds return NULL; 8311da177e4SLinus Torvalds } 8321da177e4SLinus Torvalds rap = frap; 8331da177e4SLinus Torvalds ra = *frap; 8341da177e4SLinus Torvalds ra->p_dev = dev; 8351da177e4SLinus Torvalds ra->p_ino = ino; 8361da177e4SLinus Torvalds ra->p_set = 0; 837fce1456aSGreg Banks ra->p_hindex = hash; 8381da177e4SLinus Torvalds found: 839fce1456aSGreg Banks if (rap != &rab->pb_head) { 8401da177e4SLinus Torvalds *rap = ra->p_next; 841fce1456aSGreg Banks ra->p_next = rab->pb_head; 842fce1456aSGreg Banks rab->pb_head = ra; 8431da177e4SLinus Torvalds } 8441da177e4SLinus Torvalds ra->p_count++; 8451da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 846fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8471da177e4SLinus Torvalds return ra; 8481da177e4SLinus Torvalds } 8491da177e4SLinus Torvalds 8501da177e4SLinus Torvalds /* 851cf8208d0SJens Axboe * Grab and keep cached pages associated with a file in the svc_rqst 852cf8208d0SJens Axboe * so that they can be passed to the network sendmsg/sendpage routines 853cf8208d0SJens Axboe * directly. They will be released after the sending has completed. 8541da177e4SLinus Torvalds */ 8551da177e4SLinus Torvalds static int 856cf8208d0SJens Axboe nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, 857cf8208d0SJens Axboe struct splice_desc *sd) 8581da177e4SLinus Torvalds { 859cf8208d0SJens Axboe struct svc_rqst *rqstp = sd->u.data; 86044524359SNeilBrown struct page **pp = rqstp->rq_respages + rqstp->rq_resused; 861cf8208d0SJens Axboe struct page *page = buf->page; 862cf8208d0SJens Axboe size_t size; 863cf8208d0SJens Axboe int ret; 8641da177e4SLinus Torvalds 865cac36bb0SJens Axboe ret = buf->ops->confirm(pipe, buf); 866cf8208d0SJens Axboe if (unlikely(ret)) 867cf8208d0SJens Axboe return ret; 868cf8208d0SJens Axboe 869cf8208d0SJens Axboe size = sd->len; 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 8721da177e4SLinus Torvalds get_page(page); 87344524359SNeilBrown put_page(*pp); 87444524359SNeilBrown *pp = page; 87544524359SNeilBrown rqstp->rq_resused++; 876cf8208d0SJens Axboe rqstp->rq_res.page_base = buf->offset; 8771da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 87844524359SNeilBrown } else if (page != pp[-1]) { 8791da177e4SLinus Torvalds get_page(page); 880250f3915SNeilBrown if (*pp) 88144524359SNeilBrown put_page(*pp); 88244524359SNeilBrown *pp = page; 88344524359SNeilBrown rqstp->rq_resused++; 8841da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 88544524359SNeilBrown } else 8861da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8871da177e4SLinus Torvalds 8881da177e4SLinus Torvalds return size; 8891da177e4SLinus Torvalds } 8901da177e4SLinus Torvalds 891cf8208d0SJens Axboe static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, 892cf8208d0SJens Axboe struct splice_desc *sd) 893cf8208d0SJens Axboe { 894cf8208d0SJens Axboe return __splice_from_pipe(pipe, sd, nfsd_splice_actor); 895cf8208d0SJens Axboe } 896cf8208d0SJens Axboe 897a8754beeSDave Hansen static inline int svc_msnfs(struct svc_fh *ffhp) 898a8754beeSDave Hansen { 899a8754beeSDave Hansen #ifdef MSNFS 900a8754beeSDave Hansen return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS); 901a8754beeSDave Hansen #else 902a8754beeSDave Hansen return 0; 903a8754beeSDave Hansen #endif 904a8754beeSDave Hansen } 905a8754beeSDave Hansen 9066264d69dSAl Viro static __be32 9071da177e4SLinus Torvalds nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 9081da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 9091da177e4SLinus Torvalds { 9101da177e4SLinus Torvalds struct inode *inode; 9111da177e4SLinus Torvalds struct raparms *ra; 9121da177e4SLinus Torvalds mm_segment_t oldfs; 9136264d69dSAl Viro __be32 err; 9146264d69dSAl Viro int host_err; 9151da177e4SLinus Torvalds 9161da177e4SLinus Torvalds err = nfserr_perm; 9177eaa36e2SJosef "Jeff" Sipek inode = file->f_path.dentry->d_inode; 918a8754beeSDave Hansen 919a8754beeSDave Hansen if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count)) 9201da177e4SLinus Torvalds goto out; 9211da177e4SLinus Torvalds 9221da177e4SLinus Torvalds /* Get readahead parameters */ 9231da177e4SLinus Torvalds ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); 9241da177e4SLinus Torvalds 9251da177e4SLinus Torvalds if (ra && ra->p_set) 9261da177e4SLinus Torvalds file->f_ra = ra->p_ra; 9271da177e4SLinus Torvalds 928cf8208d0SJens Axboe if (file->f_op->splice_read && rqstp->rq_splice_ok) { 929cf8208d0SJens Axboe struct splice_desc sd = { 930cf8208d0SJens Axboe .len = 0, 931cf8208d0SJens Axboe .total_len = *count, 932cf8208d0SJens Axboe .pos = offset, 933cf8208d0SJens Axboe .u.data = rqstp, 934cf8208d0SJens Axboe }; 935cf8208d0SJens Axboe 9364fbef206SJens Axboe rqstp->rq_resused = 1; 937cf8208d0SJens Axboe host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); 9381da177e4SLinus Torvalds } else { 9391da177e4SLinus Torvalds oldfs = get_fs(); 9401da177e4SLinus Torvalds set_fs(KERNEL_DS); 9416264d69dSAl Viro host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); 9421da177e4SLinus Torvalds set_fs(oldfs); 9431da177e4SLinus Torvalds } 9441da177e4SLinus Torvalds 9451da177e4SLinus Torvalds /* Write back readahead params */ 9461da177e4SLinus Torvalds if (ra) { 947fce1456aSGreg Banks struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; 948fce1456aSGreg Banks spin_lock(&rab->pb_lock); 9491da177e4SLinus Torvalds ra->p_ra = file->f_ra; 9501da177e4SLinus Torvalds ra->p_set = 1; 9511da177e4SLinus Torvalds ra->p_count--; 952fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 9531da177e4SLinus Torvalds } 9541da177e4SLinus Torvalds 9556264d69dSAl Viro if (host_err >= 0) { 9566264d69dSAl Viro nfsdstats.io_read += host_err; 9576264d69dSAl Viro *count = host_err; 9581da177e4SLinus Torvalds err = 0; 9597eaa36e2SJosef "Jeff" Sipek fsnotify_access(file->f_path.dentry); 9601da177e4SLinus Torvalds } else 9616264d69dSAl Viro err = nfserrno(host_err); 9621da177e4SLinus Torvalds out: 9631da177e4SLinus Torvalds return err; 9641da177e4SLinus Torvalds } 9651da177e4SLinus Torvalds 9669f708e40SNeil Brown static void kill_suid(struct dentry *dentry) 9679f708e40SNeil Brown { 9689f708e40SNeil Brown struct iattr ia; 969b5376771SSerge E. Hallyn ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; 9709f708e40SNeil Brown 9711b1dcc1bSJes Sorensen mutex_lock(&dentry->d_inode->i_mutex); 9729f708e40SNeil Brown notify_change(dentry, &ia); 9731b1dcc1bSJes Sorensen mutex_unlock(&dentry->d_inode->i_mutex); 9749f708e40SNeil Brown } 9759f708e40SNeil Brown 976d911df7bSJ. Bruce Fields /* 977d911df7bSJ. Bruce Fields * Gathered writes: If another process is currently writing to the file, 978d911df7bSJ. Bruce Fields * there's a high chance this is another nfsd (triggered by a bulk write 979d911df7bSJ. Bruce Fields * from a client's biod). Rather than syncing the file with each write 980d911df7bSJ. Bruce Fields * request, we sleep for 10 msec. 981d911df7bSJ. Bruce Fields * 982d911df7bSJ. Bruce Fields * I don't know if this roughly approximates C. Juszak's idea of 983d911df7bSJ. Bruce Fields * gathered writes, but it's a nice and simple solution (IMHO), and it 984d911df7bSJ. Bruce Fields * seems to work:-) 985d911df7bSJ. Bruce Fields * 986d911df7bSJ. Bruce Fields * Note: we do this only in the NFSv2 case, since v3 and higher have a 987d911df7bSJ. Bruce Fields * better tool (separate unstable writes and commits) for solving this 988d911df7bSJ. Bruce Fields * problem. 989d911df7bSJ. Bruce Fields */ 990d911df7bSJ. Bruce Fields static int wait_for_concurrent_writes(struct file *file) 991d911df7bSJ. Bruce Fields { 992d911df7bSJ. Bruce Fields struct inode *inode = file->f_path.dentry->d_inode; 993d911df7bSJ. Bruce Fields static ino_t last_ino; 994d911df7bSJ. Bruce Fields static dev_t last_dev; 995d911df7bSJ. Bruce Fields int err = 0; 996d911df7bSJ. Bruce Fields 997d911df7bSJ. Bruce Fields if (atomic_read(&inode->i_writecount) > 1 998d911df7bSJ. Bruce Fields || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 999d911df7bSJ. Bruce Fields dprintk("nfsd: write defer %d\n", task_pid_nr(current)); 1000d911df7bSJ. Bruce Fields msleep(10); 1001d911df7bSJ. Bruce Fields dprintk("nfsd: write resume %d\n", task_pid_nr(current)); 1002d911df7bSJ. Bruce Fields } 1003d911df7bSJ. Bruce Fields 1004d911df7bSJ. Bruce Fields if (inode->i_state & I_DIRTY) { 1005d911df7bSJ. Bruce Fields dprintk("nfsd: write sync %d\n", task_pid_nr(current)); 1006d911df7bSJ. Bruce Fields err = nfsd_sync(file); 1007d911df7bSJ. Bruce Fields } 1008d911df7bSJ. Bruce Fields last_ino = inode->i_ino; 1009d911df7bSJ. Bruce Fields last_dev = inode->i_sb->s_dev; 1010d911df7bSJ. Bruce Fields return err; 1011d911df7bSJ. Bruce Fields } 1012d911df7bSJ. Bruce Fields 10136264d69dSAl Viro static __be32 10141da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10151da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 101631dec253SDavid Shaw unsigned long *cnt, int *stablep) 10171da177e4SLinus Torvalds { 10181da177e4SLinus Torvalds struct svc_export *exp; 10191da177e4SLinus Torvalds struct dentry *dentry; 10201da177e4SLinus Torvalds struct inode *inode; 10211da177e4SLinus Torvalds mm_segment_t oldfs; 10226264d69dSAl Viro __be32 err = 0; 10236264d69dSAl Viro int host_err; 10241da177e4SLinus Torvalds int stable = *stablep; 102548e03bc5STrond Myklebust int use_wgather; 10261da177e4SLinus Torvalds 102745bd3b3dSNeilBrown #ifdef MSNFS 10281da177e4SLinus Torvalds err = nfserr_perm; 10291da177e4SLinus Torvalds 10301da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 103131dec253SDavid Shaw (!lock_may_write(file->f_path.dentry->d_inode, offset, *cnt))) 10321da177e4SLinus Torvalds goto out; 10331da177e4SLinus Torvalds #endif 10341da177e4SLinus Torvalds 10357eaa36e2SJosef "Jeff" Sipek dentry = file->f_path.dentry; 10361da177e4SLinus Torvalds inode = dentry->d_inode; 10371da177e4SLinus Torvalds exp = fhp->fh_export; 10381da177e4SLinus Torvalds 10391da177e4SLinus Torvalds /* 10401da177e4SLinus Torvalds * Request sync writes if 10411da177e4SLinus Torvalds * - the sync export option has been set, or 10421da177e4SLinus Torvalds * - the client requested O_SYNC behavior (NFSv3 feature). 10431da177e4SLinus Torvalds * - The file system doesn't support fsync(). 104448e03bc5STrond Myklebust * When NFSv2 gathered writes have been configured for this volume, 10451da177e4SLinus Torvalds * flushing the data to disk is handled separately below. 10461da177e4SLinus Torvalds */ 104748e03bc5STrond Myklebust use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); 10481da177e4SLinus Torvalds 10493ba15148SHarvey Harrison if (!file->f_op->fsync) {/* COMMIT3 cannot work */ 10501da177e4SLinus Torvalds stable = 2; 10511da177e4SLinus Torvalds *stablep = 2; /* FILE_SYNC */ 10521da177e4SLinus Torvalds } 10531da177e4SLinus Torvalds 10541da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 10551da177e4SLinus Torvalds stable = 0; 105648e03bc5STrond Myklebust if (stable && !use_wgather) { 1057db1dd4d3SJonathan Corbet spin_lock(&file->f_lock); 10581da177e4SLinus Torvalds file->f_flags |= O_SYNC; 1059db1dd4d3SJonathan Corbet spin_unlock(&file->f_lock); 1060db1dd4d3SJonathan Corbet } 10611da177e4SLinus Torvalds 10621da177e4SLinus Torvalds /* Write the data. */ 10631da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 10646264d69dSAl Viro host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); 10651da177e4SLinus Torvalds set_fs(oldfs); 1066e4636d53SJ. Bruce Fields if (host_err < 0) 1067e4636d53SJ. Bruce Fields goto out_nfserr; 1068a0d24b29SWei Yongjun *cnt = host_err; 106931dec253SDavid Shaw nfsdstats.io_write += host_err; 10707eaa36e2SJosef "Jeff" Sipek fsnotify_modify(file->f_path.dentry); 10711da177e4SLinus Torvalds 10721da177e4SLinus Torvalds /* clear setuid/setgid flag after write */ 1073e4636d53SJ. Bruce Fields if (inode->i_mode & (S_ISUID | S_ISGID)) 10749f708e40SNeil Brown kill_suid(dentry); 10751da177e4SLinus Torvalds 1076e4636d53SJ. Bruce Fields if (stable && use_wgather) 1077d911df7bSJ. Bruce Fields host_err = wait_for_concurrent_writes(file); 10781da177e4SLinus Torvalds 1079e4636d53SJ. Bruce Fields out_nfserr: 10806264d69dSAl Viro dprintk("nfsd: write complete host_err=%d\n", host_err); 1081a0d24b29SWei Yongjun if (host_err >= 0) 10821da177e4SLinus Torvalds err = 0; 1083a0d24b29SWei Yongjun else 10846264d69dSAl Viro err = nfserrno(host_err); 10851da177e4SLinus Torvalds out: 10861da177e4SLinus Torvalds return err; 10871da177e4SLinus Torvalds } 10881da177e4SLinus Torvalds 10891da177e4SLinus Torvalds /* 10901da177e4SLinus Torvalds * Read data from a file. count must contain the requested read count 10911da177e4SLinus Torvalds * on entry. On return, *count contains the number of bytes actually read. 10921da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10931da177e4SLinus Torvalds */ 10946264d69dSAl Viro __be32 10951da177e4SLinus Torvalds nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10961da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 10971da177e4SLinus Torvalds unsigned long *count) 10981da177e4SLinus Torvalds { 10996264d69dSAl Viro __be32 err; 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds if (file) { 11020ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 11038837abcaSMiklos Szeredi NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); 11041da177e4SLinus Torvalds if (err) 11051da177e4SLinus Torvalds goto out; 11061da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 11071da177e4SLinus Torvalds } else { 11088837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 11091da177e4SLinus Torvalds if (err) 11101da177e4SLinus Torvalds goto out; 11111da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 11121da177e4SLinus Torvalds nfsd_close(file); 11131da177e4SLinus Torvalds } 11141da177e4SLinus Torvalds out: 11151da177e4SLinus Torvalds return err; 11161da177e4SLinus Torvalds } 11171da177e4SLinus Torvalds 11181da177e4SLinus Torvalds /* 11191da177e4SLinus Torvalds * Write data to a file. 11201da177e4SLinus Torvalds * The stable flag requests synchronous writes. 11211da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 11221da177e4SLinus Torvalds */ 11236264d69dSAl Viro __be32 11241da177e4SLinus Torvalds nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 112531dec253SDavid Shaw loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, 11261da177e4SLinus Torvalds int *stablep) 11271da177e4SLinus Torvalds { 11286264d69dSAl Viro __be32 err = 0; 11291da177e4SLinus Torvalds 11301da177e4SLinus Torvalds if (file) { 11310ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 11328837abcaSMiklos Szeredi NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); 11331da177e4SLinus Torvalds if (err) 11341da177e4SLinus Torvalds goto out; 11351da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, 11361da177e4SLinus Torvalds stablep); 11371da177e4SLinus Torvalds } else { 11388837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 11391da177e4SLinus Torvalds if (err) 11401da177e4SLinus Torvalds goto out; 11411da177e4SLinus Torvalds 11421da177e4SLinus Torvalds if (cnt) 11431da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, 11441da177e4SLinus Torvalds cnt, stablep); 11451da177e4SLinus Torvalds nfsd_close(file); 11461da177e4SLinus Torvalds } 11471da177e4SLinus Torvalds out: 11481da177e4SLinus Torvalds return err; 11491da177e4SLinus Torvalds } 11501da177e4SLinus Torvalds 11511da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 11521da177e4SLinus Torvalds /* 11531da177e4SLinus Torvalds * Commit all pending writes to stable storage. 11541da177e4SLinus Torvalds * Strictly speaking, we could sync just the indicated file region here, 11551da177e4SLinus Torvalds * but there's currently no way we can ask the VFS to do so. 11561da177e4SLinus Torvalds * 11571da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 11581da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 11591da177e4SLinus Torvalds */ 11606264d69dSAl Viro __be32 11611da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 11621da177e4SLinus Torvalds loff_t offset, unsigned long count) 11631da177e4SLinus Torvalds { 11641da177e4SLinus Torvalds struct file *file; 11656264d69dSAl Viro __be32 err; 11661da177e4SLinus Torvalds 11671da177e4SLinus Torvalds if ((u64)count > ~(u64)offset) 11681da177e4SLinus Torvalds return nfserr_inval; 11691da177e4SLinus Torvalds 11708837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 11718837abcaSMiklos Szeredi if (err) 11721da177e4SLinus Torvalds return err; 11731da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 11741da177e4SLinus Torvalds if (file->f_op && file->f_op->fsync) { 117545bd3b3dSNeilBrown err = nfserrno(nfsd_sync(file)); 11761da177e4SLinus Torvalds } else { 11771da177e4SLinus Torvalds err = nfserr_notsupp; 11781da177e4SLinus Torvalds } 11791da177e4SLinus Torvalds } 11801da177e4SLinus Torvalds 11811da177e4SLinus Torvalds nfsd_close(file); 11821da177e4SLinus Torvalds return err; 11831da177e4SLinus Torvalds } 11841da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 11851da177e4SLinus Torvalds 1186f2b0dee2SAdrian Bunk static __be32 11875c002b3bSJ. Bruce Fields nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, 11885c002b3bSJ. Bruce Fields struct iattr *iap) 11895c002b3bSJ. Bruce Fields { 11905c002b3bSJ. Bruce Fields /* 11915c002b3bSJ. Bruce Fields * Mode has already been set earlier in create: 11925c002b3bSJ. Bruce Fields */ 11935c002b3bSJ. Bruce Fields iap->ia_valid &= ~ATTR_MODE; 11945c002b3bSJ. Bruce Fields /* 11955c002b3bSJ. Bruce Fields * Setting uid/gid works only for root. Irix appears to 11965c002b3bSJ. Bruce Fields * send along the gid on create when it tries to implement 11975c002b3bSJ. Bruce Fields * setgid directories via NFS: 11985c002b3bSJ. Bruce Fields */ 11995cc0a840SDavid Howells if (current_fsuid() != 0) 12005c002b3bSJ. Bruce Fields iap->ia_valid &= ~(ATTR_UID|ATTR_GID); 12015c002b3bSJ. Bruce Fields if (iap->ia_valid) 12025c002b3bSJ. Bruce Fields return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 12035c002b3bSJ. Bruce Fields return 0; 12045c002b3bSJ. Bruce Fields } 12055c002b3bSJ. Bruce Fields 12064ac35c2fSwengang wang /* HPUX client sometimes creates a file in mode 000, and sets size to 0. 12074ac35c2fSwengang wang * setting size to 0 may fail for some specific file systems by the permission 12084ac35c2fSwengang wang * checking which requires WRITE permission but the mode is 000. 12094ac35c2fSwengang wang * we ignore the resizing(to 0) on the just new created file, since the size is 12104ac35c2fSwengang wang * 0 after file created. 12114ac35c2fSwengang wang * 12124ac35c2fSwengang wang * call this only after vfs_create() is called. 12134ac35c2fSwengang wang * */ 12144ac35c2fSwengang wang static void 12154ac35c2fSwengang wang nfsd_check_ignore_resizing(struct iattr *iap) 12164ac35c2fSwengang wang { 12174ac35c2fSwengang wang if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) 12184ac35c2fSwengang wang iap->ia_valid &= ~ATTR_SIZE; 12194ac35c2fSwengang wang } 12204ac35c2fSwengang wang 12211da177e4SLinus Torvalds /* 12221da177e4SLinus Torvalds * Create a file (regular, directory, device, fifo); UNIX sockets 12231da177e4SLinus Torvalds * not yet implemented. 12241da177e4SLinus Torvalds * If the response fh has been verified, the parent directory should 12251da177e4SLinus Torvalds * already be locked. Note that the parent directory is left locked. 12261da177e4SLinus Torvalds * 12271da177e4SLinus Torvalds * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 12281da177e4SLinus Torvalds */ 12296264d69dSAl Viro __be32 12301da177e4SLinus Torvalds nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 12311da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 12321da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 12331da177e4SLinus Torvalds { 12341da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 12351da177e4SLinus Torvalds struct inode *dirp; 12366264d69dSAl Viro __be32 err; 12375c002b3bSJ. Bruce Fields __be32 err2; 12386264d69dSAl Viro int host_err; 12391da177e4SLinus Torvalds 12401da177e4SLinus Torvalds err = nfserr_perm; 12411da177e4SLinus Torvalds if (!flen) 12421da177e4SLinus Torvalds goto out; 12431da177e4SLinus Torvalds err = nfserr_exist; 12441da177e4SLinus Torvalds if (isdotent(fname, flen)) 12451da177e4SLinus Torvalds goto out; 12461da177e4SLinus Torvalds 12478837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 12481da177e4SLinus Torvalds if (err) 12491da177e4SLinus Torvalds goto out; 12501da177e4SLinus Torvalds 12511da177e4SLinus Torvalds dentry = fhp->fh_dentry; 12521da177e4SLinus Torvalds dirp = dentry->d_inode; 12531da177e4SLinus Torvalds 12541da177e4SLinus Torvalds err = nfserr_notdir; 1255acfa4380SAl Viro if (!dirp->i_op->lookup) 12561da177e4SLinus Torvalds goto out; 12571da177e4SLinus Torvalds /* 12581da177e4SLinus Torvalds * Check whether the response file handle has been verified yet. 12591da177e4SLinus Torvalds * If it has, the parent directory should already be locked. 12601da177e4SLinus Torvalds */ 12611da177e4SLinus Torvalds if (!resfhp->fh_dentry) { 12621da177e4SLinus Torvalds /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ 126312fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 12641da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 12656264d69dSAl Viro host_err = PTR_ERR(dchild); 12661da177e4SLinus Torvalds if (IS_ERR(dchild)) 12671da177e4SLinus Torvalds goto out_nfserr; 12681da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 12691da177e4SLinus Torvalds if (err) 12701da177e4SLinus Torvalds goto out; 12711da177e4SLinus Torvalds } else { 12721da177e4SLinus Torvalds /* called from nfsd_proc_create */ 12731da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 12741da177e4SLinus Torvalds if (!fhp->fh_locked) { 12751da177e4SLinus Torvalds /* not actually possible */ 12761da177e4SLinus Torvalds printk(KERN_ERR 12771da177e4SLinus Torvalds "nfsd_create: parent %s/%s not locked!\n", 12781da177e4SLinus Torvalds dentry->d_parent->d_name.name, 12791da177e4SLinus Torvalds dentry->d_name.name); 1280d75f2b9fSAl Viro err = nfserr_io; 12811da177e4SLinus Torvalds goto out; 12821da177e4SLinus Torvalds } 12831da177e4SLinus Torvalds } 12841da177e4SLinus Torvalds /* 12851da177e4SLinus Torvalds * Make sure the child dentry is still negative ... 12861da177e4SLinus Torvalds */ 12871da177e4SLinus Torvalds err = nfserr_exist; 12881da177e4SLinus Torvalds if (dchild->d_inode) { 12891da177e4SLinus Torvalds dprintk("nfsd_create: dentry %s/%s not negative!\n", 12901da177e4SLinus Torvalds dentry->d_name.name, dchild->d_name.name); 12911da177e4SLinus Torvalds goto out; 12921da177e4SLinus Torvalds } 12931da177e4SLinus Torvalds 12941da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 12951da177e4SLinus Torvalds iap->ia_mode = 0; 12961da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 12971da177e4SLinus Torvalds 129807cad1d2SMiklos Szeredi err = nfserr_inval; 129907cad1d2SMiklos Szeredi if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { 130007cad1d2SMiklos Szeredi printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", 130107cad1d2SMiklos Szeredi type); 130207cad1d2SMiklos Szeredi goto out; 130307cad1d2SMiklos Szeredi } 130407cad1d2SMiklos Szeredi 130507cad1d2SMiklos Szeredi host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 130607cad1d2SMiklos Szeredi if (host_err) 130707cad1d2SMiklos Szeredi goto out_nfserr; 130807cad1d2SMiklos Szeredi 13091da177e4SLinus Torvalds /* 13101da177e4SLinus Torvalds * Get the dir op function pointer. 13111da177e4SLinus Torvalds */ 1312088406bcSJ. Bruce Fields err = 0; 13131da177e4SLinus Torvalds switch (type) { 13141da177e4SLinus Torvalds case S_IFREG: 13156264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 13164ac35c2fSwengang wang if (!host_err) 13174ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 13181da177e4SLinus Torvalds break; 13191da177e4SLinus Torvalds case S_IFDIR: 13206264d69dSAl Viro host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); 13211da177e4SLinus Torvalds break; 13221da177e4SLinus Torvalds case S_IFCHR: 13231da177e4SLinus Torvalds case S_IFBLK: 13241da177e4SLinus Torvalds case S_IFIFO: 13251da177e4SLinus Torvalds case S_IFSOCK: 13266264d69dSAl Viro host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 13271da177e4SLinus Torvalds break; 1328463c3197SDave Hansen } 1329463c3197SDave Hansen if (host_err < 0) { 1330463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1331463c3197SDave Hansen goto out_nfserr; 1332463c3197SDave Hansen } 13331da177e4SLinus Torvalds 13341da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 133545bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(dentry)); 13361da177e4SLinus Torvalds write_inode_now(dchild->d_inode, 1); 13371da177e4SLinus Torvalds } 13381da177e4SLinus Torvalds 13395c002b3bSJ. Bruce Fields err2 = nfsd_create_setattr(rqstp, resfhp, iap); 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 13591da177e4SLinus Torvalds /* 13601da177e4SLinus Torvalds * NFSv3 version of nfsd_create 13611da177e4SLinus Torvalds */ 13626264d69dSAl Viro __be32 13631da177e4SLinus Torvalds nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, 13641da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 13651da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 136681ac95c5SJ. Bruce Fields int *truncp, int *created) 13671da177e4SLinus Torvalds { 13681da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 13691da177e4SLinus Torvalds struct inode *dirp; 13706264d69dSAl Viro __be32 err; 13715c002b3bSJ. Bruce Fields __be32 err2; 13726264d69dSAl Viro int host_err; 13731da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 13741da177e4SLinus Torvalds 13751da177e4SLinus Torvalds err = nfserr_perm; 13761da177e4SLinus Torvalds if (!flen) 13771da177e4SLinus Torvalds goto out; 13781da177e4SLinus Torvalds err = nfserr_exist; 13791da177e4SLinus Torvalds if (isdotent(fname, flen)) 13801da177e4SLinus Torvalds goto out; 13811da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 13821da177e4SLinus Torvalds iap->ia_mode = 0; 13838837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 13841da177e4SLinus Torvalds if (err) 13851da177e4SLinus Torvalds goto out; 13861da177e4SLinus Torvalds 13871da177e4SLinus Torvalds dentry = fhp->fh_dentry; 13881da177e4SLinus Torvalds dirp = dentry->d_inode; 13891da177e4SLinus Torvalds 13901da177e4SLinus Torvalds /* Get all the sanity checks out of the way before 13911da177e4SLinus Torvalds * we lock the parent. */ 13921da177e4SLinus Torvalds err = nfserr_notdir; 1393acfa4380SAl Viro if (!dirp->i_op->lookup) 13941da177e4SLinus Torvalds goto out; 139512fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 13961da177e4SLinus Torvalds 13971da177e4SLinus Torvalds /* 13981da177e4SLinus Torvalds * Compose the response file handle. 13991da177e4SLinus Torvalds */ 14001da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 14016264d69dSAl Viro host_err = PTR_ERR(dchild); 14021da177e4SLinus Torvalds if (IS_ERR(dchild)) 14031da177e4SLinus Torvalds goto out_nfserr; 14041da177e4SLinus Torvalds 14051da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 14061da177e4SLinus Torvalds if (err) 14071da177e4SLinus Torvalds goto out; 14081da177e4SLinus Torvalds 14091da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1410c397852cSPeter Staubach /* solaris7 gets confused (bugid 4218508) if these have 1411749997e5SJeff Layton * the high bit set, so just clear the high bits. If this is 1412749997e5SJeff Layton * ever changed to use different attrs for storing the 1413749997e5SJeff Layton * verifier, then do_open_lookup() will also need to be fixed 1414749997e5SJeff Layton * accordingly. 14151da177e4SLinus Torvalds */ 14161da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 14171da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 14181da177e4SLinus Torvalds } 14191da177e4SLinus Torvalds 1420463c3197SDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 1421463c3197SDave Hansen if (host_err) 1422463c3197SDave Hansen goto out_nfserr; 14231da177e4SLinus Torvalds if (dchild->d_inode) { 14241da177e4SLinus Torvalds err = 0; 14251da177e4SLinus Torvalds 14261da177e4SLinus Torvalds switch (createmode) { 14271da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 14281da177e4SLinus Torvalds if (! S_ISREG(dchild->d_inode->i_mode)) 14291da177e4SLinus Torvalds err = nfserr_exist; 14301da177e4SLinus Torvalds else if (truncp) { 14311da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 14321da177e4SLinus Torvalds * differently. we don't want to truncate the 14331da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 14341da177e4SLinus Torvalds * fails for some other reason. furthermore, 14351da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 14361da177e4SLinus Torvalds * according to spec! 14371da177e4SLinus Torvalds */ 14381da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 14391da177e4SLinus Torvalds } 14401da177e4SLinus Torvalds else { 14411da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 14421da177e4SLinus Torvalds goto set_attr; 14431da177e4SLinus Torvalds } 14441da177e4SLinus Torvalds break; 14451da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 14461da177e4SLinus Torvalds if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 14471da177e4SLinus Torvalds && dchild->d_inode->i_atime.tv_sec == v_atime 14481da177e4SLinus Torvalds && dchild->d_inode->i_size == 0 ) 14491da177e4SLinus Torvalds break; 14501da177e4SLinus Torvalds /* fallthru */ 14511da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 14521da177e4SLinus Torvalds err = nfserr_exist; 14531da177e4SLinus Torvalds } 1454463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14551da177e4SLinus Torvalds goto out; 14561da177e4SLinus Torvalds } 14571da177e4SLinus Torvalds 14586264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 1459463c3197SDave Hansen if (host_err < 0) { 1460463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14611da177e4SLinus Torvalds goto out_nfserr; 1462463c3197SDave Hansen } 146381ac95c5SJ. Bruce Fields if (created) 146481ac95c5SJ. Bruce Fields *created = 1; 14651da177e4SLinus Torvalds 14661da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 146745bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(dentry)); 14681da177e4SLinus Torvalds /* setattr will sync the child (or not) */ 14691da177e4SLinus Torvalds } 14701da177e4SLinus Torvalds 14714ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 14724ac35c2fSwengang wang 14731da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1474c397852cSPeter Staubach /* Cram the verifier into atime/mtime */ 14751da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 1476c397852cSPeter Staubach | ATTR_MTIME_SET|ATTR_ATIME_SET; 14771da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 14781da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 14791da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 14801da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 14811da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 14821da177e4SLinus Torvalds } 14831da177e4SLinus Torvalds 14841da177e4SLinus Torvalds set_attr: 14855c002b3bSJ. Bruce Fields err2 = nfsd_create_setattr(rqstp, resfhp, iap); 1486f193fbabSYAMAMOTO Takashi if (err2) 148745bd3b3dSNeilBrown err = err2; 1488f193fbabSYAMAMOTO Takashi 1489463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1490f193fbabSYAMAMOTO Takashi /* 1491f193fbabSYAMAMOTO Takashi * Update the filehandle to get the new inode info. 1492f193fbabSYAMAMOTO Takashi */ 1493f193fbabSYAMAMOTO Takashi if (!err) 1494f193fbabSYAMAMOTO Takashi err = fh_update(resfhp); 14951da177e4SLinus Torvalds 14961da177e4SLinus Torvalds out: 14971da177e4SLinus Torvalds fh_unlock(fhp); 14981da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 14991da177e4SLinus Torvalds dput(dchild); 15001da177e4SLinus Torvalds return err; 15011da177e4SLinus Torvalds 15021da177e4SLinus Torvalds out_nfserr: 15036264d69dSAl Viro err = nfserrno(host_err); 15041da177e4SLinus Torvalds goto out; 15051da177e4SLinus Torvalds } 15061da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 15071da177e4SLinus Torvalds 15081da177e4SLinus Torvalds /* 15091da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 15101da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 15111da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 15121da177e4SLinus Torvalds */ 15136264d69dSAl Viro __be32 15141da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 15151da177e4SLinus Torvalds { 15161da177e4SLinus Torvalds struct dentry *dentry; 15171da177e4SLinus Torvalds struct inode *inode; 15181da177e4SLinus Torvalds mm_segment_t oldfs; 15196264d69dSAl Viro __be32 err; 15206264d69dSAl Viro int host_err; 15211da177e4SLinus Torvalds 15228837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); 15231da177e4SLinus Torvalds if (err) 15241da177e4SLinus Torvalds goto out; 15251da177e4SLinus Torvalds 15261da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15271da177e4SLinus Torvalds inode = dentry->d_inode; 15281da177e4SLinus Torvalds 15291da177e4SLinus Torvalds err = nfserr_inval; 1530acfa4380SAl Viro if (!inode->i_op->readlink) 15311da177e4SLinus Torvalds goto out; 15321da177e4SLinus Torvalds 153354775491SJan Blunck touch_atime(fhp->fh_export->ex_path.mnt, dentry); 15341da177e4SLinus Torvalds /* N.B. Why does this call need a get_fs()?? 15351da177e4SLinus Torvalds * Remove the set_fs and watch the fireworks:-) --okir 15361da177e4SLinus Torvalds */ 15371da177e4SLinus Torvalds 15381da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 15396264d69dSAl Viro host_err = inode->i_op->readlink(dentry, buf, *lenp); 15401da177e4SLinus Torvalds set_fs(oldfs); 15411da177e4SLinus Torvalds 15426264d69dSAl Viro if (host_err < 0) 15431da177e4SLinus Torvalds goto out_nfserr; 15446264d69dSAl Viro *lenp = host_err; 15451da177e4SLinus Torvalds err = 0; 15461da177e4SLinus Torvalds out: 15471da177e4SLinus Torvalds return err; 15481da177e4SLinus Torvalds 15491da177e4SLinus Torvalds out_nfserr: 15506264d69dSAl Viro err = nfserrno(host_err); 15511da177e4SLinus Torvalds goto out; 15521da177e4SLinus Torvalds } 15531da177e4SLinus Torvalds 15541da177e4SLinus Torvalds /* 15551da177e4SLinus Torvalds * Create a symlink and look up its inode 15561da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 15571da177e4SLinus Torvalds */ 15586264d69dSAl Viro __be32 15591da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 15601da177e4SLinus Torvalds char *fname, int flen, 15611da177e4SLinus Torvalds char *path, int plen, 15621da177e4SLinus Torvalds struct svc_fh *resfhp, 15631da177e4SLinus Torvalds struct iattr *iap) 15641da177e4SLinus Torvalds { 15651da177e4SLinus Torvalds struct dentry *dentry, *dnew; 15666264d69dSAl Viro __be32 err, cerr; 15676264d69dSAl Viro int host_err; 15681da177e4SLinus Torvalds 15691da177e4SLinus Torvalds err = nfserr_noent; 15701da177e4SLinus Torvalds if (!flen || !plen) 15711da177e4SLinus Torvalds goto out; 15721da177e4SLinus Torvalds err = nfserr_exist; 15731da177e4SLinus Torvalds if (isdotent(fname, flen)) 15741da177e4SLinus Torvalds goto out; 15751da177e4SLinus Torvalds 15768837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 15771da177e4SLinus Torvalds if (err) 15781da177e4SLinus Torvalds goto out; 15791da177e4SLinus Torvalds fh_lock(fhp); 15801da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15811da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 15826264d69dSAl Viro host_err = PTR_ERR(dnew); 15831da177e4SLinus Torvalds if (IS_ERR(dnew)) 15841da177e4SLinus Torvalds goto out_nfserr; 15851da177e4SLinus Torvalds 158675c3f29dSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 158775c3f29dSDave Hansen if (host_err) 158875c3f29dSDave Hansen goto out_nfserr; 158975c3f29dSDave Hansen 15901da177e4SLinus Torvalds if (unlikely(path[plen] != 0)) { 15911da177e4SLinus Torvalds char *path_alloced = kmalloc(plen+1, GFP_KERNEL); 15921da177e4SLinus Torvalds if (path_alloced == NULL) 15936264d69dSAl Viro host_err = -ENOMEM; 15941da177e4SLinus Torvalds else { 15951da177e4SLinus Torvalds strncpy(path_alloced, path, plen); 15961da177e4SLinus Torvalds path_alloced[plen] = 0; 1597db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); 15981da177e4SLinus Torvalds kfree(path_alloced); 15991da177e4SLinus Torvalds } 16001da177e4SLinus Torvalds } else 1601db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path); 16021da177e4SLinus Torvalds 16036264d69dSAl Viro if (!host_err) { 16041da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 16056264d69dSAl Viro host_err = nfsd_sync_dir(dentry); 16066264d69dSAl Viro } 16076264d69dSAl Viro err = nfserrno(host_err); 16081da177e4SLinus Torvalds fh_unlock(fhp); 16091da177e4SLinus Torvalds 161075c3f29dSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 161175c3f29dSDave Hansen 16121da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 16131da177e4SLinus Torvalds dput(dnew); 16141da177e4SLinus Torvalds if (err==0) err = cerr; 16151da177e4SLinus Torvalds out: 16161da177e4SLinus Torvalds return err; 16171da177e4SLinus Torvalds 16181da177e4SLinus Torvalds out_nfserr: 16196264d69dSAl Viro err = nfserrno(host_err); 16201da177e4SLinus Torvalds goto out; 16211da177e4SLinus Torvalds } 16221da177e4SLinus Torvalds 16231da177e4SLinus Torvalds /* 16241da177e4SLinus Torvalds * Create a hardlink 16251da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16261da177e4SLinus Torvalds */ 16276264d69dSAl Viro __be32 16281da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 16291da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 16301da177e4SLinus Torvalds { 16311da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 16321da177e4SLinus Torvalds struct inode *dirp, *dest; 16336264d69dSAl Viro __be32 err; 16346264d69dSAl Viro int host_err; 16351da177e4SLinus Torvalds 16368837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); 16371da177e4SLinus Torvalds if (err) 16381da177e4SLinus Torvalds goto out; 16398837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP); 16401da177e4SLinus Torvalds if (err) 16411da177e4SLinus Torvalds goto out; 16421da177e4SLinus Torvalds 16431da177e4SLinus Torvalds err = nfserr_perm; 16441da177e4SLinus Torvalds if (!len) 16451da177e4SLinus Torvalds goto out; 16461da177e4SLinus Torvalds err = nfserr_exist; 16471da177e4SLinus Torvalds if (isdotent(name, len)) 16481da177e4SLinus Torvalds goto out; 16491da177e4SLinus Torvalds 165012fd3520SPeter Zijlstra fh_lock_nested(ffhp, I_MUTEX_PARENT); 16511da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 16521da177e4SLinus Torvalds dirp = ddir->d_inode; 16531da177e4SLinus Torvalds 16541da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 16556264d69dSAl Viro host_err = PTR_ERR(dnew); 16561da177e4SLinus Torvalds if (IS_ERR(dnew)) 16571da177e4SLinus Torvalds goto out_nfserr; 16581da177e4SLinus Torvalds 16591da177e4SLinus Torvalds dold = tfhp->fh_dentry; 16601da177e4SLinus Torvalds dest = dold->d_inode; 16611da177e4SLinus Torvalds 166275c3f29dSDave Hansen host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt); 166375c3f29dSDave Hansen if (host_err) { 166475c3f29dSDave Hansen err = nfserrno(host_err); 166575c3f29dSDave Hansen goto out_dput; 166675c3f29dSDave Hansen } 16676264d69dSAl Viro host_err = vfs_link(dold, dirp, dnew); 16686264d69dSAl Viro if (!host_err) { 16691da177e4SLinus Torvalds if (EX_ISSYNC(ffhp->fh_export)) { 167045bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(ddir)); 16711da177e4SLinus Torvalds write_inode_now(dest, 1); 16721da177e4SLinus Torvalds } 16736264d69dSAl Viro err = 0; 16741da177e4SLinus Torvalds } else { 16756264d69dSAl Viro if (host_err == -EXDEV && rqstp->rq_vers == 2) 16761da177e4SLinus Torvalds err = nfserr_acces; 16771da177e4SLinus Torvalds else 16786264d69dSAl Viro err = nfserrno(host_err); 16791da177e4SLinus Torvalds } 168075c3f29dSDave Hansen mnt_drop_write(tfhp->fh_export->ex_path.mnt); 168175c3f29dSDave Hansen out_dput: 16821da177e4SLinus Torvalds dput(dnew); 1683270d56e5SDavid M. Richter out_unlock: 1684270d56e5SDavid M. Richter fh_unlock(ffhp); 16851da177e4SLinus Torvalds out: 16861da177e4SLinus Torvalds return err; 16871da177e4SLinus Torvalds 16881da177e4SLinus Torvalds out_nfserr: 16896264d69dSAl Viro err = nfserrno(host_err); 1690270d56e5SDavid M. Richter goto out_unlock; 16911da177e4SLinus Torvalds } 16921da177e4SLinus Torvalds 16931da177e4SLinus Torvalds /* 16941da177e4SLinus Torvalds * Rename a file 16951da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16961da177e4SLinus Torvalds */ 16976264d69dSAl Viro __be32 16981da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 16991da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 17001da177e4SLinus Torvalds { 17011da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 17021da177e4SLinus Torvalds struct inode *fdir, *tdir; 17036264d69dSAl Viro __be32 err; 17046264d69dSAl Viro int host_err; 17051da177e4SLinus Torvalds 17068837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); 17071da177e4SLinus Torvalds if (err) 17081da177e4SLinus Torvalds goto out; 17098837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); 17101da177e4SLinus Torvalds if (err) 17111da177e4SLinus Torvalds goto out; 17121da177e4SLinus Torvalds 17131da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 17141da177e4SLinus Torvalds fdir = fdentry->d_inode; 17151da177e4SLinus Torvalds 17161da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 17171da177e4SLinus Torvalds tdir = tdentry->d_inode; 17181da177e4SLinus Torvalds 17191da177e4SLinus Torvalds err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; 1720a56f3937SNeilBrown if (ffhp->fh_export != tfhp->fh_export) 17211da177e4SLinus Torvalds goto out; 17221da177e4SLinus Torvalds 17231da177e4SLinus Torvalds err = nfserr_perm; 17241da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 17251da177e4SLinus Torvalds goto out; 17261da177e4SLinus Torvalds 17271da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 17281da177e4SLinus Torvalds * so do it by hand */ 17291da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 17301da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 1; 17311da177e4SLinus Torvalds fill_pre_wcc(ffhp); 17321da177e4SLinus Torvalds fill_pre_wcc(tfhp); 17331da177e4SLinus Torvalds 17341da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 17356264d69dSAl Viro host_err = PTR_ERR(odentry); 17361da177e4SLinus Torvalds if (IS_ERR(odentry)) 17371da177e4SLinus Torvalds goto out_nfserr; 17381da177e4SLinus Torvalds 17396264d69dSAl Viro host_err = -ENOENT; 17401da177e4SLinus Torvalds if (!odentry->d_inode) 17411da177e4SLinus Torvalds goto out_dput_old; 17426264d69dSAl Viro host_err = -EINVAL; 17431da177e4SLinus Torvalds if (odentry == trap) 17441da177e4SLinus Torvalds goto out_dput_old; 17451da177e4SLinus Torvalds 17461da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 17476264d69dSAl Viro host_err = PTR_ERR(ndentry); 17481da177e4SLinus Torvalds if (IS_ERR(ndentry)) 17491da177e4SLinus Torvalds goto out_dput_old; 17506264d69dSAl Viro host_err = -ENOTEMPTY; 17511da177e4SLinus Torvalds if (ndentry == trap) 17521da177e4SLinus Torvalds goto out_dput_new; 17531da177e4SLinus Torvalds 17549079b1ebSDave Hansen if (svc_msnfs(ffhp) && 17551da177e4SLinus Torvalds ((atomic_read(&odentry->d_count) > 1) 17561da177e4SLinus Torvalds || (atomic_read(&ndentry->d_count) > 1))) { 17576264d69dSAl Viro host_err = -EPERM; 17589079b1ebSDave Hansen goto out_dput_new; 17599079b1ebSDave Hansen } 17609079b1ebSDave Hansen 17619079b1ebSDave Hansen host_err = -EXDEV; 17629079b1ebSDave Hansen if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) 17639079b1ebSDave Hansen goto out_dput_new; 17649079b1ebSDave Hansen host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt); 17659079b1ebSDave Hansen if (host_err) 17669079b1ebSDave Hansen goto out_dput_new; 17679079b1ebSDave Hansen 17686264d69dSAl Viro host_err = vfs_rename(fdir, odentry, tdir, ndentry); 17696264d69dSAl Viro if (!host_err && EX_ISSYNC(tfhp->fh_export)) { 17706264d69dSAl Viro host_err = nfsd_sync_dir(tdentry); 17716264d69dSAl Viro if (!host_err) 17726264d69dSAl Viro host_err = nfsd_sync_dir(fdentry); 17731da177e4SLinus Torvalds } 17741da177e4SLinus Torvalds 17759079b1ebSDave Hansen mnt_drop_write(ffhp->fh_export->ex_path.mnt); 17769079b1ebSDave Hansen 17771da177e4SLinus Torvalds out_dput_new: 17781da177e4SLinus Torvalds dput(ndentry); 17791da177e4SLinus Torvalds out_dput_old: 17801da177e4SLinus Torvalds dput(odentry); 17811da177e4SLinus Torvalds out_nfserr: 17826264d69dSAl Viro err = nfserrno(host_err); 17831da177e4SLinus Torvalds 17841da177e4SLinus Torvalds /* we cannot reply on fh_unlock on the two filehandles, 17851da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 17861da177e4SLinus Torvalds * were the same, so again we do it by hand 17871da177e4SLinus Torvalds */ 17881da177e4SLinus Torvalds fill_post_wcc(ffhp); 17891da177e4SLinus Torvalds fill_post_wcc(tfhp); 17901da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 17911da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 0; 17921da177e4SLinus Torvalds 17931da177e4SLinus Torvalds out: 17941da177e4SLinus Torvalds return err; 17951da177e4SLinus Torvalds } 17961da177e4SLinus Torvalds 17971da177e4SLinus Torvalds /* 17981da177e4SLinus Torvalds * Unlink a file or directory 17991da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 18001da177e4SLinus Torvalds */ 18016264d69dSAl Viro __be32 18021da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 18031da177e4SLinus Torvalds char *fname, int flen) 18041da177e4SLinus Torvalds { 18051da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 18061da177e4SLinus Torvalds struct inode *dirp; 18076264d69dSAl Viro __be32 err; 18086264d69dSAl Viro int host_err; 18091da177e4SLinus Torvalds 18101da177e4SLinus Torvalds err = nfserr_acces; 18111da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 18121da177e4SLinus Torvalds goto out; 18138837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); 18141da177e4SLinus Torvalds if (err) 18151da177e4SLinus Torvalds goto out; 18161da177e4SLinus Torvalds 181712fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 18181da177e4SLinus Torvalds dentry = fhp->fh_dentry; 18191da177e4SLinus Torvalds dirp = dentry->d_inode; 18201da177e4SLinus Torvalds 18211da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 18226264d69dSAl Viro host_err = PTR_ERR(rdentry); 18231da177e4SLinus Torvalds if (IS_ERR(rdentry)) 18241da177e4SLinus Torvalds goto out_nfserr; 18251da177e4SLinus Torvalds 18261da177e4SLinus Torvalds if (!rdentry->d_inode) { 18271da177e4SLinus Torvalds dput(rdentry); 18281da177e4SLinus Torvalds err = nfserr_noent; 18291da177e4SLinus Torvalds goto out; 18301da177e4SLinus Torvalds } 18311da177e4SLinus Torvalds 18321da177e4SLinus Torvalds if (!type) 18331da177e4SLinus Torvalds type = rdentry->d_inode->i_mode & S_IFMT; 18341da177e4SLinus Torvalds 18350622753bSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 18360622753bSDave Hansen if (host_err) 18370622753bSDave Hansen goto out_nfserr; 18380622753bSDave Hansen 18391da177e4SLinus Torvalds if (type != S_IFDIR) { /* It's UNLINK */ 18401da177e4SLinus Torvalds #ifdef MSNFS 18411da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 18421da177e4SLinus Torvalds (atomic_read(&rdentry->d_count) > 1)) { 18436264d69dSAl Viro host_err = -EPERM; 18441da177e4SLinus Torvalds } else 18451da177e4SLinus Torvalds #endif 18466264d69dSAl Viro host_err = vfs_unlink(dirp, rdentry); 18471da177e4SLinus Torvalds } else { /* It's RMDIR */ 18486264d69dSAl Viro host_err = vfs_rmdir(dirp, rdentry); 18491da177e4SLinus Torvalds } 18501da177e4SLinus Torvalds 18511da177e4SLinus Torvalds dput(rdentry); 18521da177e4SLinus Torvalds 18536264d69dSAl Viro if (host_err) 18540622753bSDave Hansen goto out_drop; 18556264d69dSAl Viro if (EX_ISSYNC(fhp->fh_export)) 18566264d69dSAl Viro host_err = nfsd_sync_dir(dentry); 18571da177e4SLinus Torvalds 18580622753bSDave Hansen out_drop: 18590622753bSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 18601da177e4SLinus Torvalds out_nfserr: 18616264d69dSAl Viro err = nfserrno(host_err); 1862f193fbabSYAMAMOTO Takashi out: 1863f193fbabSYAMAMOTO Takashi return err; 18641da177e4SLinus Torvalds } 18651da177e4SLinus Torvalds 18661da177e4SLinus Torvalds /* 186714f7dd63SDavid Woodhouse * We do this buffering because we must not call back into the file 186814f7dd63SDavid Woodhouse * system's ->lookup() method from the filldir callback. That may well 186914f7dd63SDavid Woodhouse * deadlock a number of file systems. 187014f7dd63SDavid Woodhouse * 187114f7dd63SDavid Woodhouse * This is based heavily on the implementation of same in XFS. 187214f7dd63SDavid Woodhouse */ 187314f7dd63SDavid Woodhouse struct buffered_dirent { 187414f7dd63SDavid Woodhouse u64 ino; 187514f7dd63SDavid Woodhouse loff_t offset; 187614f7dd63SDavid Woodhouse int namlen; 187714f7dd63SDavid Woodhouse unsigned int d_type; 187814f7dd63SDavid Woodhouse char name[]; 187914f7dd63SDavid Woodhouse }; 188014f7dd63SDavid Woodhouse 188114f7dd63SDavid Woodhouse struct readdir_data { 188214f7dd63SDavid Woodhouse char *dirent; 188314f7dd63SDavid Woodhouse size_t used; 188453c9c5c0SAl Viro int full; 188514f7dd63SDavid Woodhouse }; 188614f7dd63SDavid Woodhouse 188714f7dd63SDavid Woodhouse static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, 188814f7dd63SDavid Woodhouse loff_t offset, u64 ino, unsigned int d_type) 188914f7dd63SDavid Woodhouse { 189014f7dd63SDavid Woodhouse struct readdir_data *buf = __buf; 189114f7dd63SDavid Woodhouse struct buffered_dirent *de = (void *)(buf->dirent + buf->used); 189214f7dd63SDavid Woodhouse unsigned int reclen; 189314f7dd63SDavid Woodhouse 189414f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); 189553c9c5c0SAl Viro if (buf->used + reclen > PAGE_SIZE) { 189653c9c5c0SAl Viro buf->full = 1; 189714f7dd63SDavid Woodhouse return -EINVAL; 189853c9c5c0SAl Viro } 189914f7dd63SDavid Woodhouse 190014f7dd63SDavid Woodhouse de->namlen = namlen; 190114f7dd63SDavid Woodhouse de->offset = offset; 190214f7dd63SDavid Woodhouse de->ino = ino; 190314f7dd63SDavid Woodhouse de->d_type = d_type; 190414f7dd63SDavid Woodhouse memcpy(de->name, name, namlen); 190514f7dd63SDavid Woodhouse buf->used += reclen; 190614f7dd63SDavid Woodhouse 190714f7dd63SDavid Woodhouse return 0; 190814f7dd63SDavid Woodhouse } 190914f7dd63SDavid Woodhouse 19102f9092e1SDavid Woodhouse static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func, 19112628b766SDavid Woodhouse struct readdir_cd *cdp, loff_t *offsetp) 19122628b766SDavid Woodhouse { 191314f7dd63SDavid Woodhouse struct readdir_data buf; 191414f7dd63SDavid Woodhouse struct buffered_dirent *de; 19152628b766SDavid Woodhouse int host_err; 191614f7dd63SDavid Woodhouse int size; 191714f7dd63SDavid Woodhouse loff_t offset; 19182628b766SDavid Woodhouse 191914f7dd63SDavid Woodhouse buf.dirent = (void *)__get_free_page(GFP_KERNEL); 192014f7dd63SDavid Woodhouse if (!buf.dirent) 19212f9092e1SDavid Woodhouse return nfserrno(-ENOMEM); 192214f7dd63SDavid Woodhouse 192314f7dd63SDavid Woodhouse offset = *offsetp; 19242628b766SDavid Woodhouse 192514f7dd63SDavid Woodhouse while (1) { 19262f9092e1SDavid Woodhouse struct inode *dir_inode = file->f_path.dentry->d_inode; 192714f7dd63SDavid Woodhouse unsigned int reclen; 192814f7dd63SDavid Woodhouse 1929b726e923SDoug Nazar cdp->err = nfserr_eof; /* will be cleared on successful read */ 193014f7dd63SDavid Woodhouse buf.used = 0; 193153c9c5c0SAl Viro buf.full = 0; 193214f7dd63SDavid Woodhouse 193314f7dd63SDavid Woodhouse host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf); 193453c9c5c0SAl Viro if (buf.full) 193553c9c5c0SAl Viro host_err = 0; 193653c9c5c0SAl Viro 193753c9c5c0SAl Viro if (host_err < 0) 193814f7dd63SDavid Woodhouse break; 193914f7dd63SDavid Woodhouse 194014f7dd63SDavid Woodhouse size = buf.used; 194114f7dd63SDavid Woodhouse 194214f7dd63SDavid Woodhouse if (!size) 194314f7dd63SDavid Woodhouse break; 194414f7dd63SDavid Woodhouse 19452f9092e1SDavid Woodhouse /* 19462f9092e1SDavid Woodhouse * Various filldir functions may end up calling back into 19472f9092e1SDavid Woodhouse * lookup_one_len() and the file system's ->lookup() method. 19482f9092e1SDavid Woodhouse * These expect i_mutex to be held, as it would within readdir. 19492f9092e1SDavid Woodhouse */ 19502f9092e1SDavid Woodhouse host_err = mutex_lock_killable(&dir_inode->i_mutex); 19512f9092e1SDavid Woodhouse if (host_err) 19522f9092e1SDavid Woodhouse break; 19532f9092e1SDavid Woodhouse 195414f7dd63SDavid Woodhouse de = (struct buffered_dirent *)buf.dirent; 195514f7dd63SDavid Woodhouse while (size > 0) { 195614f7dd63SDavid Woodhouse offset = de->offset; 195714f7dd63SDavid Woodhouse 195814f7dd63SDavid Woodhouse if (func(cdp, de->name, de->namlen, de->offset, 195914f7dd63SDavid Woodhouse de->ino, de->d_type)) 19602f9092e1SDavid Woodhouse break; 196114f7dd63SDavid Woodhouse 196214f7dd63SDavid Woodhouse if (cdp->err != nfs_ok) 19632f9092e1SDavid Woodhouse break; 196414f7dd63SDavid Woodhouse 196514f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(*de) + de->namlen, 196614f7dd63SDavid Woodhouse sizeof(u64)); 196714f7dd63SDavid Woodhouse size -= reclen; 196814f7dd63SDavid Woodhouse de = (struct buffered_dirent *)((char *)de + reclen); 196914f7dd63SDavid Woodhouse } 19702f9092e1SDavid Woodhouse mutex_unlock(&dir_inode->i_mutex); 19712f9092e1SDavid Woodhouse if (size > 0) /* We bailed out early */ 19722f9092e1SDavid Woodhouse break; 19732f9092e1SDavid Woodhouse 1974c002a6c7SDavid Woodhouse offset = vfs_llseek(file, 0, SEEK_CUR); 197514f7dd63SDavid Woodhouse } 197614f7dd63SDavid Woodhouse 197714f7dd63SDavid Woodhouse free_page((unsigned long)(buf.dirent)); 19782628b766SDavid Woodhouse 19792628b766SDavid Woodhouse if (host_err) 19802628b766SDavid Woodhouse return nfserrno(host_err); 198114f7dd63SDavid Woodhouse 198214f7dd63SDavid Woodhouse *offsetp = offset; 19832628b766SDavid Woodhouse return cdp->err; 19842628b766SDavid Woodhouse } 19852628b766SDavid Woodhouse 19861da177e4SLinus Torvalds /* 19871da177e4SLinus Torvalds * Read entries from a directory. 19881da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 19891da177e4SLinus Torvalds */ 19906264d69dSAl Viro __be32 19911da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 1992a0ad13efSNeilBrown struct readdir_cd *cdp, filldir_t func) 19931da177e4SLinus Torvalds { 19946264d69dSAl Viro __be32 err; 19951da177e4SLinus Torvalds struct file *file; 19961da177e4SLinus Torvalds loff_t offset = *offsetp; 19971da177e4SLinus Torvalds 19988837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file); 19991da177e4SLinus Torvalds if (err) 20001da177e4SLinus Torvalds goto out; 20011da177e4SLinus Torvalds 20021da177e4SLinus Torvalds offset = vfs_llseek(file, offset, 0); 20031da177e4SLinus Torvalds if (offset < 0) { 20041da177e4SLinus Torvalds err = nfserrno((int)offset); 20051da177e4SLinus Torvalds goto out_close; 20061da177e4SLinus Torvalds } 20071da177e4SLinus Torvalds 200814f7dd63SDavid Woodhouse err = nfsd_buffered_readdir(file, func, cdp, offsetp); 20091da177e4SLinus Torvalds 20101da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 20111da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 20121da177e4SLinus Torvalds out_close: 20131da177e4SLinus Torvalds nfsd_close(file); 20141da177e4SLinus Torvalds out: 20151da177e4SLinus Torvalds return err; 20161da177e4SLinus Torvalds } 20171da177e4SLinus Torvalds 20181da177e4SLinus Torvalds /* 20191da177e4SLinus Torvalds * Get file system stats 20201da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 20211da177e4SLinus Torvalds */ 20226264d69dSAl Viro __be32 202304716e66SJ. Bruce Fields nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) 20241da177e4SLinus Torvalds { 202504716e66SJ. Bruce Fields __be32 err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); 2026726c3342SDavid Howells if (!err && vfs_statfs(fhp->fh_dentry,stat)) 20271da177e4SLinus Torvalds err = nfserr_io; 20281da177e4SLinus Torvalds return err; 20291da177e4SLinus Torvalds } 20301da177e4SLinus Torvalds 2031c7d51402SJ. Bruce Fields static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) 2032e22841c6SJ. Bruce Fields { 2033c7d51402SJ. Bruce Fields return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; 2034e22841c6SJ. Bruce Fields } 2035e22841c6SJ. Bruce Fields 20361da177e4SLinus Torvalds /* 20371da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 20381da177e4SLinus Torvalds */ 20396264d69dSAl Viro __be32 20400ec757dfSJ. Bruce Fields nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, 20410ec757dfSJ. Bruce Fields struct dentry *dentry, int acc) 20421da177e4SLinus Torvalds { 20431da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 204414dba533SMimi Zohar struct path path; 20451da177e4SLinus Torvalds int err; 20461da177e4SLinus Torvalds 20478837abcaSMiklos Szeredi if (acc == NFSD_MAY_NOP) 20481da177e4SLinus Torvalds return 0; 20491da177e4SLinus Torvalds #if 0 20501da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 20511da177e4SLinus Torvalds acc, 20528837abcaSMiklos Szeredi (acc & NFSD_MAY_READ)? " read" : "", 20538837abcaSMiklos Szeredi (acc & NFSD_MAY_WRITE)? " write" : "", 20548837abcaSMiklos Szeredi (acc & NFSD_MAY_EXEC)? " exec" : "", 20558837abcaSMiklos Szeredi (acc & NFSD_MAY_SATTR)? " sattr" : "", 20568837abcaSMiklos Szeredi (acc & NFSD_MAY_TRUNC)? " trunc" : "", 20578837abcaSMiklos Szeredi (acc & NFSD_MAY_LOCK)? " lock" : "", 20588837abcaSMiklos Szeredi (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", 20591da177e4SLinus Torvalds inode->i_mode, 20601da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 20611da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 20622c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); 20631da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 20645cc0a840SDavid Howells inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); 20651da177e4SLinus Torvalds #endif 20661da177e4SLinus Torvalds 20671da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 20681da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 20691da177e4SLinus Torvalds * device special file, we ignore rofs. 20701da177e4SLinus Torvalds */ 20718837abcaSMiklos Szeredi if (!(acc & NFSD_MAY_LOCAL_ACCESS)) 20728837abcaSMiklos Szeredi if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { 20732c463e95SDave Hansen if (exp_rdonly(rqstp, exp) || 20742c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)) 20751da177e4SLinus Torvalds return nfserr_rofs; 20768837abcaSMiklos Szeredi if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) 20771da177e4SLinus Torvalds return nfserr_perm; 20781da177e4SLinus Torvalds } 20798837abcaSMiklos Szeredi if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) 20801da177e4SLinus Torvalds return nfserr_perm; 20811da177e4SLinus Torvalds 20828837abcaSMiklos Szeredi if (acc & NFSD_MAY_LOCK) { 20831da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 20841da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 20851da177e4SLinus Torvalds * ownership 20861da177e4SLinus Torvalds */ 20871da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 20881da177e4SLinus Torvalds return 0; 20891da177e4SLinus Torvalds else 20908837abcaSMiklos Szeredi acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; 20911da177e4SLinus Torvalds } 20921da177e4SLinus Torvalds /* 20931da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 20941da177e4SLinus Torvalds * would normally be checked at open time. This is to make 20951da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 20961da177e4SLinus Torvalds * 20971da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 20981da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 20991da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 21001da177e4SLinus Torvalds * always implies file truncation. 21011da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 21021da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 21031da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 21041da177e4SLinus Torvalds * with NFSv3. 21051da177e4SLinus Torvalds */ 21068837abcaSMiklos Szeredi if ((acc & NFSD_MAY_OWNER_OVERRIDE) && 21075cc0a840SDavid Howells inode->i_uid == current_fsuid()) 21081da177e4SLinus Torvalds return 0; 21091da177e4SLinus Torvalds 21108837abcaSMiklos Szeredi /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ 2111f419a2e3SAl Viro err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); 21121da177e4SLinus Torvalds 21131da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 21141da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 21158837abcaSMiklos Szeredi acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE)) 2116f419a2e3SAl Viro err = inode_permission(inode, MAY_EXEC); 211714dba533SMimi Zohar if (err) 211814dba533SMimi Zohar goto nfsd_out; 21191da177e4SLinus Torvalds 212014dba533SMimi Zohar /* Do integrity (permission) checking now, but defer incrementing 212114dba533SMimi Zohar * IMA counts to the actual file open. 212214dba533SMimi Zohar */ 212314dba533SMimi Zohar path.mnt = exp->ex_path.mnt; 212414dba533SMimi Zohar path.dentry = dentry; 2125*1429b3ecSAl Viro err = ima_path_check(&path, acc & (MAY_READ | MAY_WRITE | MAY_EXEC)); 212614dba533SMimi Zohar nfsd_out: 21271da177e4SLinus Torvalds return err? nfserrno(err) : 0; 21281da177e4SLinus Torvalds } 21291da177e4SLinus Torvalds 21301da177e4SLinus Torvalds void 21311da177e4SLinus Torvalds nfsd_racache_shutdown(void) 21321da177e4SLinus Torvalds { 213354a66e54SJeff Layton struct raparms *raparm, *last_raparm; 213454a66e54SJeff Layton unsigned int i; 213554a66e54SJeff Layton 21361da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 213754a66e54SJeff Layton 213854a66e54SJeff Layton for (i = 0; i < RAPARM_HASH_SIZE; i++) { 213954a66e54SJeff Layton raparm = raparm_hash[i].pb_head; 214054a66e54SJeff Layton while(raparm) { 214154a66e54SJeff Layton last_raparm = raparm; 214254a66e54SJeff Layton raparm = raparm->p_next; 214354a66e54SJeff Layton kfree(last_raparm); 214454a66e54SJeff Layton } 214554a66e54SJeff Layton raparm_hash[i].pb_head = NULL; 214654a66e54SJeff Layton } 21471da177e4SLinus Torvalds } 21481da177e4SLinus Torvalds /* 21491da177e4SLinus Torvalds * Initialize readahead param cache 21501da177e4SLinus Torvalds */ 21511da177e4SLinus Torvalds int 21521da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 21531da177e4SLinus Torvalds { 21541da177e4SLinus Torvalds int i; 2155fce1456aSGreg Banks int j = 0; 2156fce1456aSGreg Banks int nperbucket; 215754a66e54SJeff Layton struct raparms **raparm = NULL; 21581da177e4SLinus Torvalds 2159fce1456aSGreg Banks 216054a66e54SJeff Layton if (raparm_hash[0].pb_head) 21611da177e4SLinus Torvalds return 0; 216254a66e54SJeff Layton nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); 216354a66e54SJeff Layton if (nperbucket < 2) 216454a66e54SJeff Layton nperbucket = 2; 216554a66e54SJeff Layton cache_size = nperbucket * RAPARM_HASH_SIZE; 21664b3bb06bSYan Burman 21674b3bb06bSYan Burman dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); 216854a66e54SJeff Layton 2169fce1456aSGreg Banks for (i = 0; i < RAPARM_HASH_SIZE; i++) { 2170fce1456aSGreg Banks spin_lock_init(&raparm_hash[i].pb_lock); 217154a66e54SJeff Layton 217254a66e54SJeff Layton raparm = &raparm_hash[i].pb_head; 217354a66e54SJeff Layton for (j = 0; j < nperbucket; j++) { 217454a66e54SJeff Layton *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); 217554a66e54SJeff Layton if (!*raparm) 217654a66e54SJeff Layton goto out_nomem; 217754a66e54SJeff Layton raparm = &(*raparm)->p_next; 2178fce1456aSGreg Banks } 217954a66e54SJeff Layton *raparm = NULL; 21801da177e4SLinus Torvalds } 21814b3bb06bSYan Burman 21821da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 21831da177e4SLinus Torvalds return 0; 218454a66e54SJeff Layton 218554a66e54SJeff Layton out_nomem: 218654a66e54SJeff Layton dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); 218754a66e54SJeff Layton nfsd_racache_shutdown(); 218854a66e54SJeff Layton return -ENOMEM; 21891da177e4SLinus Torvalds } 2190a257cdd0SAndreas Gruenbacher 2191a257cdd0SAndreas Gruenbacher #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 2192a257cdd0SAndreas Gruenbacher struct posix_acl * 2193a257cdd0SAndreas Gruenbacher nfsd_get_posix_acl(struct svc_fh *fhp, int type) 2194a257cdd0SAndreas Gruenbacher { 2195a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2196a257cdd0SAndreas Gruenbacher char *name; 2197a257cdd0SAndreas Gruenbacher void *value = NULL; 2198a257cdd0SAndreas Gruenbacher ssize_t size; 2199a257cdd0SAndreas Gruenbacher struct posix_acl *acl; 2200a257cdd0SAndreas Gruenbacher 22015be196e5SChristoph Hellwig if (!IS_POSIXACL(inode)) 2202a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 22035be196e5SChristoph Hellwig 2204a257cdd0SAndreas Gruenbacher switch (type) { 2205a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2206334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2207a257cdd0SAndreas Gruenbacher break; 2208a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2209334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2210a257cdd0SAndreas Gruenbacher break; 2211a257cdd0SAndreas Gruenbacher default: 2212a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 2213a257cdd0SAndreas Gruenbacher } 2214a257cdd0SAndreas Gruenbacher 22155be196e5SChristoph Hellwig size = nfsd_getxattr(fhp->fh_dentry, name, &value); 22165be196e5SChristoph Hellwig if (size < 0) 22175be196e5SChristoph Hellwig return ERR_PTR(size); 2218a257cdd0SAndreas Gruenbacher 2219a257cdd0SAndreas Gruenbacher acl = posix_acl_from_xattr(value, size); 2220a257cdd0SAndreas Gruenbacher kfree(value); 2221a257cdd0SAndreas Gruenbacher return acl; 2222a257cdd0SAndreas Gruenbacher } 2223a257cdd0SAndreas Gruenbacher 2224a257cdd0SAndreas Gruenbacher int 2225a257cdd0SAndreas Gruenbacher nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) 2226a257cdd0SAndreas Gruenbacher { 2227a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2228a257cdd0SAndreas Gruenbacher char *name; 2229a257cdd0SAndreas Gruenbacher void *value = NULL; 2230a257cdd0SAndreas Gruenbacher size_t size; 2231a257cdd0SAndreas Gruenbacher int error; 2232a257cdd0SAndreas Gruenbacher 2233acfa4380SAl Viro if (!IS_POSIXACL(inode) || 2234a257cdd0SAndreas Gruenbacher !inode->i_op->setxattr || !inode->i_op->removexattr) 2235a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2236a257cdd0SAndreas Gruenbacher switch(type) { 2237a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2238334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2239a257cdd0SAndreas Gruenbacher break; 2240a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2241334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2242a257cdd0SAndreas Gruenbacher break; 2243a257cdd0SAndreas Gruenbacher default: 2244a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2245a257cdd0SAndreas Gruenbacher } 2246a257cdd0SAndreas Gruenbacher 2247a257cdd0SAndreas Gruenbacher if (acl && acl->a_count) { 2248334a13ecSChristoph Hellwig size = posix_acl_xattr_size(acl->a_count); 2249a257cdd0SAndreas Gruenbacher value = kmalloc(size, GFP_KERNEL); 2250a257cdd0SAndreas Gruenbacher if (!value) 2251a257cdd0SAndreas Gruenbacher return -ENOMEM; 22529ccfc29cSFlorin Malita error = posix_acl_to_xattr(acl, value, size); 22539ccfc29cSFlorin Malita if (error < 0) 2254a257cdd0SAndreas Gruenbacher goto getout; 22559ccfc29cSFlorin Malita size = error; 2256a257cdd0SAndreas Gruenbacher } else 2257a257cdd0SAndreas Gruenbacher size = 0; 2258a257cdd0SAndreas Gruenbacher 225918f335afSDave Hansen error = mnt_want_write(fhp->fh_export->ex_path.mnt); 226018f335afSDave Hansen if (error) 226118f335afSDave Hansen goto getout; 2262a257cdd0SAndreas Gruenbacher if (size) 22635be196e5SChristoph Hellwig error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); 2264a257cdd0SAndreas Gruenbacher else { 2265a257cdd0SAndreas Gruenbacher if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) 2266a257cdd0SAndreas Gruenbacher error = 0; 2267a257cdd0SAndreas Gruenbacher else { 22685be196e5SChristoph Hellwig error = vfs_removexattr(fhp->fh_dentry, name); 2269a257cdd0SAndreas Gruenbacher if (error == -ENODATA) 2270a257cdd0SAndreas Gruenbacher error = 0; 2271a257cdd0SAndreas Gruenbacher } 2272a257cdd0SAndreas Gruenbacher } 227318f335afSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 2274a257cdd0SAndreas Gruenbacher 2275a257cdd0SAndreas Gruenbacher getout: 2276a257cdd0SAndreas Gruenbacher kfree(value); 2277a257cdd0SAndreas Gruenbacher return error; 2278a257cdd0SAndreas Gruenbacher } 2279a257cdd0SAndreas Gruenbacher #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ 2280