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 921da177e4SLinus Torvalds /* 931da177e4SLinus Torvalds * Called from nfsd_lookup and encode_dirent. Check if we have crossed 941da177e4SLinus Torvalds * a mount point. 95e0bb89efSJ.Bruce Fields * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, 961da177e4SLinus Torvalds * or nfs_ok having possibly changed *dpp and *expp 971da177e4SLinus Torvalds */ 981da177e4SLinus Torvalds int 991da177e4SLinus Torvalds nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 1001da177e4SLinus Torvalds struct svc_export **expp) 1011da177e4SLinus Torvalds { 1021da177e4SLinus Torvalds struct svc_export *exp = *expp, *exp2 = NULL; 1031da177e4SLinus Torvalds struct dentry *dentry = *dpp; 10491c9fa8fSAl Viro struct path path = {.mnt = mntget(exp->ex_path.mnt), 10591c9fa8fSAl Viro .dentry = dget(dentry)}; 1066264d69dSAl Viro int err = 0; 1071da177e4SLinus Torvalds 10891c9fa8fSAl Viro while (follow_down(&path.mnt, &path.dentry) && 10991c9fa8fSAl Viro d_mountpoint(path.dentry)) 11091c9fa8fSAl Viro ; 1111da177e4SLinus Torvalds 11291c9fa8fSAl Viro exp2 = rqst_exp_get_by_name(rqstp, &path); 1131da177e4SLinus Torvalds if (IS_ERR(exp2)) { 114a1033be7SNeil Brown if (PTR_ERR(exp2) != -ENOENT) 1151da177e4SLinus Torvalds err = PTR_ERR(exp2); 11691c9fa8fSAl Viro path_put(&path); 1171da177e4SLinus Torvalds goto out; 1181da177e4SLinus Torvalds } 1195d3dbbeaSJ. Bruce Fields if ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { 1201da177e4SLinus Torvalds /* successfully crossed mount point */ 1211644ccc8SAl Viro /* 12291c9fa8fSAl Viro * This is subtle: path.dentry is *not* on path.mnt 12391c9fa8fSAl Viro * at this point. The only reason we are safe is that 12491c9fa8fSAl Viro * original mnt is pinned down by exp, so we should 12591c9fa8fSAl Viro * put path *before* putting exp 1261644ccc8SAl Viro */ 12791c9fa8fSAl Viro *dpp = path.dentry; 12891c9fa8fSAl Viro path.dentry = dentry; 1291644ccc8SAl Viro *expp = exp2; 13091c9fa8fSAl Viro exp2 = exp; 1311da177e4SLinus Torvalds } 13291c9fa8fSAl Viro path_put(&path); 13391c9fa8fSAl Viro exp_put(exp2); 1341da177e4SLinus Torvalds out: 1351da177e4SLinus Torvalds return err; 1361da177e4SLinus Torvalds } 1371da177e4SLinus Torvalds 1386264d69dSAl Viro __be32 1396c0a654dSJ. Bruce Fields nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, 1405a022fc8SChuck Lever const char *name, unsigned int len, 1416c0a654dSJ. Bruce Fields struct svc_export **exp_ret, struct dentry **dentry_ret) 1421da177e4SLinus Torvalds { 1431da177e4SLinus Torvalds struct svc_export *exp; 1441da177e4SLinus Torvalds struct dentry *dparent; 1451da177e4SLinus Torvalds struct dentry *dentry; 1466264d69dSAl Viro __be32 err; 1476264d69dSAl Viro int host_err; 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds /* Obtain dentry and export. */ 1528837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 1531da177e4SLinus Torvalds if (err) 1541da177e4SLinus Torvalds return err; 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds dparent = fhp->fh_dentry; 1571da177e4SLinus Torvalds exp = fhp->fh_export; 1581da177e4SLinus Torvalds exp_get(exp); 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds /* Lookup the name, but don't follow links */ 1611da177e4SLinus Torvalds if (isdotent(name, len)) { 1621da177e4SLinus Torvalds if (len==1) 1631da177e4SLinus Torvalds dentry = dget(dparent); 16454775491SJan Blunck else if (dparent != exp->ex_path.dentry) 1651da177e4SLinus Torvalds dentry = dget_parent(dparent); 16654775491SJan Blunck else if (!EX_NOHIDE(exp)) 1671da177e4SLinus Torvalds dentry = dget(dparent); /* .. == . just like at / */ 1681da177e4SLinus Torvalds else { 1691da177e4SLinus Torvalds /* checking mountpoint crossing is very different when stepping up */ 1701da177e4SLinus Torvalds struct svc_export *exp2 = NULL; 1711da177e4SLinus Torvalds struct dentry *dp; 172e64c390cSAl Viro struct path path = {.mnt = mntget(exp->ex_path.mnt), 173e64c390cSAl Viro .dentry = dget(dparent)}; 1741da177e4SLinus Torvalds 175e64c390cSAl Viro while (path.dentry == path.mnt->mnt_root && 176*bab77ebfSAl Viro follow_up(&path)) 177e64c390cSAl Viro ; 178e64c390cSAl Viro dp = dget_parent(path.dentry); 179e64c390cSAl Viro dput(path.dentry); 180e64c390cSAl Viro path.dentry = dp; 181e64c390cSAl Viro 182e64c390cSAl Viro exp2 = rqst_exp_parent(rqstp, &path); 1832d3bb252SJ. Bruce Fields if (PTR_ERR(exp2) == -ENOENT) { 1842d3bb252SJ. Bruce Fields dentry = dget(dparent); 1852d3bb252SJ. Bruce Fields } else if (IS_ERR(exp2)) { 1866264d69dSAl Viro host_err = PTR_ERR(exp2); 187e64c390cSAl Viro path_put(&path); 1881da177e4SLinus Torvalds goto out_nfserr; 1891da177e4SLinus Torvalds } else { 190e64c390cSAl Viro dentry = dget(path.dentry); 1911da177e4SLinus Torvalds exp_put(exp); 1921da177e4SLinus Torvalds exp = exp2; 1931da177e4SLinus Torvalds } 194e64c390cSAl Viro path_put(&path); 1951da177e4SLinus Torvalds } 1961da177e4SLinus Torvalds } else { 1971da177e4SLinus Torvalds fh_lock(fhp); 1981da177e4SLinus Torvalds dentry = lookup_one_len(name, dparent, len); 1996264d69dSAl Viro host_err = PTR_ERR(dentry); 2001da177e4SLinus Torvalds if (IS_ERR(dentry)) 2011da177e4SLinus Torvalds goto out_nfserr; 2021da177e4SLinus Torvalds /* 2031da177e4SLinus Torvalds * check if we have crossed a mount point ... 2041da177e4SLinus Torvalds */ 2051da177e4SLinus Torvalds if (d_mountpoint(dentry)) { 2066264d69dSAl Viro if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 2071da177e4SLinus Torvalds dput(dentry); 2081da177e4SLinus Torvalds goto out_nfserr; 2091da177e4SLinus Torvalds } 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds } 2126c0a654dSJ. Bruce Fields *dentry_ret = dentry; 2136c0a654dSJ. Bruce Fields *exp_ret = exp; 2146c0a654dSJ. Bruce Fields return 0; 2156c0a654dSJ. Bruce Fields 2166c0a654dSJ. Bruce Fields out_nfserr: 2176c0a654dSJ. Bruce Fields exp_put(exp); 2186c0a654dSJ. Bruce Fields return nfserrno(host_err); 2196c0a654dSJ. Bruce Fields } 2206c0a654dSJ. Bruce Fields 2216c0a654dSJ. Bruce Fields /* 2226c0a654dSJ. Bruce Fields * Look up one component of a pathname. 2236c0a654dSJ. Bruce Fields * N.B. After this call _both_ fhp and resfh need an fh_put 2246c0a654dSJ. Bruce Fields * 2256c0a654dSJ. Bruce Fields * If the lookup would cross a mountpoint, and the mounted filesystem 2266c0a654dSJ. Bruce Fields * is exported to the client with NFSEXP_NOHIDE, then the lookup is 2276c0a654dSJ. Bruce Fields * accepted as it stands and the mounted directory is 2286c0a654dSJ. Bruce Fields * returned. Otherwise the covered directory is returned. 2296c0a654dSJ. Bruce Fields * NOTE: this mountpoint crossing is not supported properly by all 2306c0a654dSJ. Bruce Fields * clients and is explicitly disallowed for NFSv3 2316c0a654dSJ. Bruce Fields * NeilBrown <neilb@cse.unsw.edu.au> 2326c0a654dSJ. Bruce Fields */ 2336c0a654dSJ. Bruce Fields __be32 2346c0a654dSJ. Bruce Fields nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 2355a022fc8SChuck Lever unsigned int len, struct svc_fh *resfh) 2366c0a654dSJ. Bruce Fields { 2376c0a654dSJ. Bruce Fields struct svc_export *exp; 2386c0a654dSJ. Bruce Fields struct dentry *dentry; 2396c0a654dSJ. Bruce Fields __be32 err; 2406c0a654dSJ. Bruce Fields 2416c0a654dSJ. Bruce Fields err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); 2426c0a654dSJ. Bruce Fields if (err) 2436c0a654dSJ. Bruce Fields return err; 24432c1eb0cSAndy Adamson err = check_nfsd_access(exp, rqstp); 24532c1eb0cSAndy Adamson if (err) 24632c1eb0cSAndy Adamson goto out; 2471da177e4SLinus Torvalds /* 2481da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2491da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2501da177e4SLinus Torvalds */ 2511da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2521da177e4SLinus Torvalds if (!err && !dentry->d_inode) 2531da177e4SLinus Torvalds err = nfserr_noent; 25432c1eb0cSAndy Adamson out: 2551da177e4SLinus Torvalds dput(dentry); 2561da177e4SLinus Torvalds exp_put(exp); 2571da177e4SLinus Torvalds return err; 2581da177e4SLinus Torvalds } 2591da177e4SLinus Torvalds 2606c0a654dSJ. Bruce Fields 2611da177e4SLinus Torvalds /* 2621da177e4SLinus Torvalds * Set various file attributes. 2631da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 2641da177e4SLinus Torvalds */ 2656264d69dSAl Viro __be32 2661da177e4SLinus Torvalds nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 2671da177e4SLinus Torvalds int check_guard, time_t guardtime) 2681da177e4SLinus Torvalds { 2691da177e4SLinus Torvalds struct dentry *dentry; 2701da177e4SLinus Torvalds struct inode *inode; 2718837abcaSMiklos Szeredi int accmode = NFSD_MAY_SATTR; 2721da177e4SLinus Torvalds int ftype = 0; 2736264d69dSAl Viro __be32 err; 2746264d69dSAl Viro int host_err; 2751da177e4SLinus Torvalds int size_change = 0; 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) 2788837abcaSMiklos Szeredi accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; 2791da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) 2801da177e4SLinus Torvalds ftype = S_IFREG; 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds /* Get inode */ 2831da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 28415b7a1b8SNeilBrown if (err) 2851da177e4SLinus Torvalds goto out; 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds dentry = fhp->fh_dentry; 2881da177e4SLinus Torvalds inode = dentry->d_inode; 2891da177e4SLinus Torvalds 29015b7a1b8SNeilBrown /* Ignore any mode updates on symlinks */ 29115b7a1b8SNeilBrown if (S_ISLNK(inode->i_mode)) 29215b7a1b8SNeilBrown iap->ia_valid &= ~ATTR_MODE; 29315b7a1b8SNeilBrown 29415b7a1b8SNeilBrown if (!iap->ia_valid) 29515b7a1b8SNeilBrown goto out; 29615b7a1b8SNeilBrown 2979c85fca5SChristoph Hellwig /* 2989c85fca5SChristoph Hellwig * NFSv2 does not differentiate between "set-[ac]time-to-now" 2991da177e4SLinus Torvalds * which only requires access, and "set-[ac]time-to-X" which 3001da177e4SLinus Torvalds * requires ownership. 3011da177e4SLinus Torvalds * So if it looks like it might be "set both to the same time which 3021da177e4SLinus Torvalds * is close to now", and if inode_change_ok fails, then we 3031da177e4SLinus Torvalds * convert to "set to now" instead of "set to explicit time" 3041da177e4SLinus Torvalds * 3051da177e4SLinus Torvalds * We only call inode_change_ok as the last test as technically 3061da177e4SLinus Torvalds * it is not an interface that we should be using. It is only 3071da177e4SLinus Torvalds * valid if the filesystem does not define it's own i_op->setattr. 3081da177e4SLinus Torvalds */ 3091da177e4SLinus Torvalds #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) 3101da177e4SLinus Torvalds #define MAX_TOUCH_TIME_ERROR (30*60) 3119c85fca5SChristoph Hellwig if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && 3129c85fca5SChristoph Hellwig iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { 3139c85fca5SChristoph Hellwig /* 3149c85fca5SChristoph Hellwig * Looks probable. 3159c85fca5SChristoph Hellwig * 3169c85fca5SChristoph Hellwig * Now just make sure time is in the right ballpark. 3179c85fca5SChristoph Hellwig * Solaris, at least, doesn't seem to care what the time 3189c85fca5SChristoph Hellwig * request is. We require it be within 30 minutes of now. 3191da177e4SLinus Torvalds */ 3201da177e4SLinus Torvalds time_t delta = iap->ia_atime.tv_sec - get_seconds(); 3219c85fca5SChristoph Hellwig if (delta < 0) 3229c85fca5SChristoph Hellwig delta = -delta; 3231da177e4SLinus Torvalds if (delta < MAX_TOUCH_TIME_ERROR && 3241da177e4SLinus Torvalds inode_change_ok(inode, iap) != 0) { 3259c85fca5SChristoph Hellwig /* 3269c85fca5SChristoph Hellwig * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. 3279c85fca5SChristoph Hellwig * This will cause notify_change to set these times 3289c85fca5SChristoph Hellwig * to "now" 3291da177e4SLinus Torvalds */ 3301da177e4SLinus Torvalds iap->ia_valid &= ~BOTH_TIME_SET; 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds } 3331da177e4SLinus Torvalds 3349c85fca5SChristoph Hellwig /* 3359c85fca5SChristoph Hellwig * The size case is special. 3369c85fca5SChristoph Hellwig * It changes the file as well as the attributes. 3379c85fca5SChristoph Hellwig */ 3381da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) { 3391da177e4SLinus Torvalds if (iap->ia_size < inode->i_size) { 3408837abcaSMiklos Szeredi err = nfsd_permission(rqstp, fhp->fh_export, dentry, 3418837abcaSMiklos Szeredi NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE); 3421da177e4SLinus Torvalds if (err) 3431da177e4SLinus Torvalds goto out; 3441da177e4SLinus Torvalds } 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds /* 3471da177e4SLinus Torvalds * If we are changing the size of the file, then 3481da177e4SLinus Torvalds * we need to break all leases. 3491da177e4SLinus Torvalds */ 3506264d69dSAl Viro host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK); 3516264d69dSAl Viro if (host_err == -EWOULDBLOCK) 3526264d69dSAl Viro host_err = -ETIMEDOUT; 3536264d69dSAl Viro if (host_err) /* ENOMEM or EWOULDBLOCK */ 3541da177e4SLinus Torvalds goto out_nfserr; 3551da177e4SLinus Torvalds 3566264d69dSAl Viro host_err = get_write_access(inode); 3576264d69dSAl Viro if (host_err) 3581da177e4SLinus Torvalds goto out_nfserr; 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds size_change = 1; 3616264d69dSAl Viro host_err = locks_verify_truncate(inode, NULL, iap->ia_size); 3626264d69dSAl Viro if (host_err) { 3631da177e4SLinus Torvalds put_write_access(inode); 3641da177e4SLinus Torvalds goto out_nfserr; 3651da177e4SLinus Torvalds } 36690c0af05SJan Kara vfs_dq_init(inode); 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds 369ca456252SJeff Layton /* sanitize the mode change */ 3701da177e4SLinus Torvalds if (iap->ia_valid & ATTR_MODE) { 3711da177e4SLinus Torvalds iap->ia_mode &= S_IALLUGO; 372dee3209dSJeff Layton iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); 3731da177e4SLinus Torvalds } 374ca456252SJeff Layton 375ca456252SJeff Layton /* Revoke setuid/setgid on chown */ 3760953e620SSachin S. Prabhu if (!S_ISDIR(inode->i_mode) && 3770953e620SSachin S. Prabhu (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) || 3780953e620SSachin S. Prabhu ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) { 379ca456252SJeff Layton iap->ia_valid |= ATTR_KILL_PRIV; 380ca456252SJeff Layton if (iap->ia_valid & ATTR_MODE) { 381ca456252SJeff Layton /* we're setting mode too, just clear the s*id bits */ 382ca456252SJeff Layton iap->ia_mode &= ~S_ISUID; 383ca456252SJeff Layton if (iap->ia_mode & S_IXGRP) 3848a0ce7d9SJeff Layton iap->ia_mode &= ~S_ISGID; 3858a0ce7d9SJeff Layton } else { 386ca456252SJeff Layton /* set ATTR_KILL_* bits and let VFS handle it */ 387ca456252SJeff Layton iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); 388ca456252SJeff Layton } 3898a0ce7d9SJeff Layton } 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds /* Change the attributes. */ 3921da177e4SLinus Torvalds 3931da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvalds err = nfserr_notsync; 3961da177e4SLinus Torvalds if (!check_guard || guardtime == inode->i_ctime.tv_sec) { 3971da177e4SLinus Torvalds fh_lock(fhp); 3986264d69dSAl Viro host_err = notify_change(dentry, iap); 3996264d69dSAl Viro err = nfserrno(host_err); 4001da177e4SLinus Torvalds fh_unlock(fhp); 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds if (size_change) 4031da177e4SLinus Torvalds put_write_access(inode); 4041da177e4SLinus Torvalds if (!err) 4051da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 4061da177e4SLinus Torvalds write_inode_now(inode, 1); 4071da177e4SLinus Torvalds out: 4081da177e4SLinus Torvalds return err; 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds out_nfserr: 4116264d69dSAl Viro err = nfserrno(host_err); 4121da177e4SLinus Torvalds goto out; 4131da177e4SLinus Torvalds } 4141da177e4SLinus Torvalds 4155be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V2_ACL) || \ 4165be196e5SChristoph Hellwig defined(CONFIG_NFSD_V3_ACL) || \ 4175be196e5SChristoph Hellwig defined(CONFIG_NFSD_V4) 4185be196e5SChristoph Hellwig static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) 4195be196e5SChristoph Hellwig { 4205be196e5SChristoph Hellwig ssize_t buflen; 4216c6a426fSKrishna Kumar ssize_t ret; 4221da177e4SLinus Torvalds 4235be196e5SChristoph Hellwig buflen = vfs_getxattr(dentry, key, NULL, 0); 4245be196e5SChristoph Hellwig if (buflen <= 0) 4255be196e5SChristoph Hellwig return buflen; 4265be196e5SChristoph Hellwig 4275be196e5SChristoph Hellwig *buf = kmalloc(buflen, GFP_KERNEL); 4285be196e5SChristoph Hellwig if (!*buf) 4295be196e5SChristoph Hellwig return -ENOMEM; 4305be196e5SChristoph Hellwig 4316c6a426fSKrishna Kumar ret = vfs_getxattr(dentry, key, *buf, buflen); 4326c6a426fSKrishna Kumar if (ret < 0) 4336c6a426fSKrishna Kumar kfree(*buf); 4346c6a426fSKrishna Kumar return ret; 4355be196e5SChristoph Hellwig } 4365be196e5SChristoph Hellwig #endif 4375be196e5SChristoph Hellwig 4385be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V4) 4391da177e4SLinus Torvalds static int 4401da177e4SLinus Torvalds set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) 4411da177e4SLinus Torvalds { 4421da177e4SLinus Torvalds int len; 4431da177e4SLinus Torvalds size_t buflen; 4441da177e4SLinus Torvalds char *buf = NULL; 4451da177e4SLinus Torvalds int error = 0; 4461da177e4SLinus Torvalds 4471da177e4SLinus Torvalds buflen = posix_acl_xattr_size(pacl->a_count); 4481da177e4SLinus Torvalds buf = kmalloc(buflen, GFP_KERNEL); 4491da177e4SLinus Torvalds error = -ENOMEM; 4501da177e4SLinus Torvalds if (buf == NULL) 4511da177e4SLinus Torvalds goto out; 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds len = posix_acl_to_xattr(pacl, buf, buflen); 4541da177e4SLinus Torvalds if (len < 0) { 4551da177e4SLinus Torvalds error = len; 4561da177e4SLinus Torvalds goto out; 4571da177e4SLinus Torvalds } 4581da177e4SLinus Torvalds 4595be196e5SChristoph Hellwig error = vfs_setxattr(dentry, key, buf, len, 0); 4601da177e4SLinus Torvalds out: 4611da177e4SLinus Torvalds kfree(buf); 4621da177e4SLinus Torvalds return error; 4631da177e4SLinus Torvalds } 4641da177e4SLinus Torvalds 4656264d69dSAl Viro __be32 4661da177e4SLinus Torvalds nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, 4671da177e4SLinus Torvalds struct nfs4_acl *acl) 4681da177e4SLinus Torvalds { 4696264d69dSAl Viro __be32 error; 4706264d69dSAl Viro int host_error; 4711da177e4SLinus Torvalds struct dentry *dentry; 4721da177e4SLinus Torvalds struct inode *inode; 4731da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 4741da177e4SLinus Torvalds unsigned int flags = 0; 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds /* Get inode */ 4778837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); 4781da177e4SLinus Torvalds if (error) 4794b2ca38aSJ. Bruce Fields return error; 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds dentry = fhp->fh_dentry; 4821da177e4SLinus Torvalds inode = dentry->d_inode; 4831da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) 4841da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 4851da177e4SLinus Torvalds 4866264d69dSAl Viro host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); 4876264d69dSAl Viro if (host_error == -EINVAL) { 4884b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 4896264d69dSAl Viro } else if (host_error < 0) 4901da177e4SLinus Torvalds goto out_nfserr; 4911da177e4SLinus Torvalds 4926264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); 4936264d69dSAl Viro if (host_error < 0) 4944b2ca38aSJ. Bruce Fields goto out_release; 4951da177e4SLinus Torvalds 4964b2ca38aSJ. Bruce Fields if (S_ISDIR(inode->i_mode)) 4976264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); 4981da177e4SLinus Torvalds 4994b2ca38aSJ. Bruce Fields out_release: 5001da177e4SLinus Torvalds posix_acl_release(pacl); 5011da177e4SLinus Torvalds posix_acl_release(dpacl); 5021da177e4SLinus Torvalds out_nfserr: 503f34f9242SJ. Bruce Fields if (host_error == -EOPNOTSUPP) 5044b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 505f34f9242SJ. Bruce Fields else 5064b2ca38aSJ. Bruce Fields return nfserrno(host_error); 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds static struct posix_acl * 5101da177e4SLinus Torvalds _get_posix_acl(struct dentry *dentry, char *key) 5111da177e4SLinus Torvalds { 5125be196e5SChristoph Hellwig void *buf = NULL; 5131da177e4SLinus Torvalds struct posix_acl *pacl = NULL; 5145be196e5SChristoph Hellwig int buflen; 5151da177e4SLinus Torvalds 5165be196e5SChristoph Hellwig buflen = nfsd_getxattr(dentry, key, &buf); 5175be196e5SChristoph Hellwig if (!buflen) 5185be196e5SChristoph Hellwig buflen = -ENODATA; 5195be196e5SChristoph Hellwig if (buflen <= 0) 5205be196e5SChristoph Hellwig return ERR_PTR(buflen); 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds pacl = posix_acl_from_xattr(buf, buflen); 5231da177e4SLinus Torvalds kfree(buf); 5241da177e4SLinus Torvalds return pacl; 5251da177e4SLinus Torvalds } 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds int 5281da177e4SLinus Torvalds nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) 5291da177e4SLinus Torvalds { 5301da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 5311da177e4SLinus Torvalds int error = 0; 5321da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 5331da177e4SLinus Torvalds unsigned int flags = 0; 5341da177e4SLinus Torvalds 5359a59f452SChristoph Hellwig pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); 5361da177e4SLinus Torvalds if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) 5371da177e4SLinus Torvalds pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 5381da177e4SLinus Torvalds if (IS_ERR(pacl)) { 5391da177e4SLinus Torvalds error = PTR_ERR(pacl); 5401da177e4SLinus Torvalds pacl = NULL; 5411da177e4SLinus Torvalds goto out; 5421da177e4SLinus Torvalds } 5431da177e4SLinus Torvalds 5441da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) { 5459a59f452SChristoph Hellwig dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); 5461da177e4SLinus Torvalds if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) 5471da177e4SLinus Torvalds dpacl = NULL; 5481da177e4SLinus Torvalds else if (IS_ERR(dpacl)) { 5491da177e4SLinus Torvalds error = PTR_ERR(dpacl); 5501da177e4SLinus Torvalds dpacl = NULL; 5511da177e4SLinus Torvalds goto out; 5521da177e4SLinus Torvalds } 5531da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5541da177e4SLinus Torvalds } 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); 5571da177e4SLinus Torvalds if (IS_ERR(*acl)) { 5581da177e4SLinus Torvalds error = PTR_ERR(*acl); 5591da177e4SLinus Torvalds *acl = NULL; 5601da177e4SLinus Torvalds } 5611da177e4SLinus Torvalds out: 5621da177e4SLinus Torvalds posix_acl_release(pacl); 5631da177e4SLinus Torvalds posix_acl_release(dpacl); 5641da177e4SLinus Torvalds return error; 5651da177e4SLinus Torvalds } 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds #endif /* defined(CONFIG_NFS_V4) */ 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 5701da177e4SLinus Torvalds /* 5711da177e4SLinus Torvalds * Check server access rights to a file system object 5721da177e4SLinus Torvalds */ 5731da177e4SLinus Torvalds struct accessmap { 5741da177e4SLinus Torvalds u32 access; 5751da177e4SLinus Torvalds int how; 5761da177e4SLinus Torvalds }; 5771da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 5788837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 5798837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 5808837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, 5818837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds { 0, 0 } 5841da177e4SLinus Torvalds }; 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 5878837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 5888837abcaSMiklos Szeredi { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, 5898837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, 5908837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, 5918837abcaSMiklos Szeredi { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, 5921da177e4SLinus Torvalds 5931da177e4SLinus Torvalds { 0, 0 } 5941da177e4SLinus Torvalds }; 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 5971da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 5981da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 5991da177e4SLinus Torvalds * (which really, the server doesn't care about). So 6001da177e4SLinus Torvalds * We provide simple access checking for them, looking 6011da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 6021da177e4SLinus Torvalds * filesystem checks 6031da177e4SLinus Torvalds */ 6048837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6058837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6068837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6078837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6081da177e4SLinus Torvalds 6091da177e4SLinus Torvalds { 0, 0 } 6101da177e4SLinus Torvalds }; 6111da177e4SLinus Torvalds 6126264d69dSAl Viro __be32 6131da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 6141da177e4SLinus Torvalds { 6151da177e4SLinus Torvalds struct accessmap *map; 6161da177e4SLinus Torvalds struct svc_export *export; 6171da177e4SLinus Torvalds struct dentry *dentry; 6181da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 6196264d69dSAl Viro __be32 error; 6201da177e4SLinus Torvalds 6218837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 6221da177e4SLinus Torvalds if (error) 6231da177e4SLinus Torvalds goto out; 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds export = fhp->fh_export; 6261da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds if (S_ISREG(dentry->d_inode->i_mode)) 6291da177e4SLinus Torvalds map = nfs3_regaccess; 6301da177e4SLinus Torvalds else if (S_ISDIR(dentry->d_inode->i_mode)) 6311da177e4SLinus Torvalds map = nfs3_diraccess; 6321da177e4SLinus Torvalds else 6331da177e4SLinus Torvalds map = nfs3_anyaccess; 6341da177e4SLinus Torvalds 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds query = *access; 6371da177e4SLinus Torvalds for (; map->access; map++) { 6381da177e4SLinus Torvalds if (map->access & query) { 6396264d69dSAl Viro __be32 err2; 6401da177e4SLinus Torvalds 6411da177e4SLinus Torvalds sresult |= map->access; 6421da177e4SLinus Torvalds 6430ec757dfSJ. Bruce Fields err2 = nfsd_permission(rqstp, export, dentry, map->how); 6441da177e4SLinus Torvalds switch (err2) { 6451da177e4SLinus Torvalds case nfs_ok: 6461da177e4SLinus Torvalds result |= map->access; 6471da177e4SLinus Torvalds break; 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 6501da177e4SLinus Torvalds * rather than an error occurred */ 6511da177e4SLinus Torvalds case nfserr_rofs: 6521da177e4SLinus Torvalds case nfserr_acces: 6531da177e4SLinus Torvalds case nfserr_perm: 6541da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 6551da177e4SLinus Torvalds break; 6561da177e4SLinus Torvalds default: 6571da177e4SLinus Torvalds error = err2; 6581da177e4SLinus Torvalds goto out; 6591da177e4SLinus Torvalds } 6601da177e4SLinus Torvalds } 6611da177e4SLinus Torvalds } 6621da177e4SLinus Torvalds *access = result; 6631da177e4SLinus Torvalds if (supported) 6641da177e4SLinus Torvalds *supported = sresult; 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds out: 6671da177e4SLinus Torvalds return error; 6681da177e4SLinus Torvalds } 6691da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds /* 6741da177e4SLinus Torvalds * Open an existing file or directory. 6751da177e4SLinus Torvalds * The access argument indicates the type of open (read/write/lock) 6761da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 6771da177e4SLinus Torvalds */ 6786264d69dSAl Viro __be32 6791da177e4SLinus Torvalds nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 6801da177e4SLinus Torvalds int access, struct file **filp) 6811da177e4SLinus Torvalds { 682745ca247SDavid Howells const struct cred *cred = current_cred(); 6831da177e4SLinus Torvalds struct dentry *dentry; 6841da177e4SLinus Torvalds struct inode *inode; 6856264d69dSAl Viro int flags = O_RDONLY|O_LARGEFILE; 6866264d69dSAl Viro __be32 err; 6876264d69dSAl Viro int host_err; 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvalds /* 6901da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 6911da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 6921da177e4SLinus Torvalds * in case a chmod has now revoked permission. 6931da177e4SLinus Torvalds */ 6948837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE); 6951da177e4SLinus Torvalds if (err) 6961da177e4SLinus Torvalds goto out; 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6991da177e4SLinus Torvalds inode = dentry->d_inode; 7001da177e4SLinus Torvalds 7011da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 7021da177e4SLinus Torvalds * or any access when mandatory locking enabled 7031da177e4SLinus Torvalds */ 7041da177e4SLinus Torvalds err = nfserr_perm; 7058837abcaSMiklos Szeredi if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE)) 7061da177e4SLinus Torvalds goto out; 7075e7fc436SJ. Bruce Fields /* 7085e7fc436SJ. Bruce Fields * We must ignore files (but only files) which might have mandatory 7095e7fc436SJ. Bruce Fields * locks on them because there is no way to know if the accesser has 7105e7fc436SJ. Bruce Fields * the lock. 7115e7fc436SJ. Bruce Fields */ 7125e7fc436SJ. Bruce Fields if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) 7131da177e4SLinus Torvalds goto out; 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds if (!inode->i_fop) 7161da177e4SLinus Torvalds goto out; 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds /* 7191da177e4SLinus Torvalds * Check to see if there are any leases on this file. 7201da177e4SLinus Torvalds * This may block while leases are broken. 7211da177e4SLinus Torvalds */ 7228837abcaSMiklos Szeredi host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? FMODE_WRITE : 0)); 7236264d69dSAl Viro if (host_err == -EWOULDBLOCK) 7246264d69dSAl Viro host_err = -ETIMEDOUT; 7256264d69dSAl Viro if (host_err) /* NOMEM or WOULDBLOCK */ 7261da177e4SLinus Torvalds goto out_nfserr; 7271da177e4SLinus Torvalds 7288837abcaSMiklos Szeredi if (access & NFSD_MAY_WRITE) { 7298837abcaSMiklos Szeredi if (access & NFSD_MAY_READ) 7309ecb6a08SJ. Bruce Fields flags = O_RDWR|O_LARGEFILE; 7319ecb6a08SJ. Bruce Fields else 7321da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 7331da177e4SLinus Torvalds 73490c0af05SJan Kara vfs_dq_init(inode); 7351da177e4SLinus Torvalds } 73654775491SJan Blunck *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt), 737745ca247SDavid Howells flags, cred); 7381da177e4SLinus Torvalds if (IS_ERR(*filp)) 7396264d69dSAl Viro host_err = PTR_ERR(*filp); 74014dba533SMimi Zohar else 74114dba533SMimi Zohar ima_counts_get(*filp); 7421da177e4SLinus Torvalds out_nfserr: 7436264d69dSAl Viro err = nfserrno(host_err); 7441da177e4SLinus Torvalds out: 7451da177e4SLinus Torvalds return err; 7461da177e4SLinus Torvalds } 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds /* 7491da177e4SLinus Torvalds * Close a file. 7501da177e4SLinus Torvalds */ 7511da177e4SLinus Torvalds void 7521da177e4SLinus Torvalds nfsd_close(struct file *filp) 7531da177e4SLinus Torvalds { 7541da177e4SLinus Torvalds fput(filp); 7551da177e4SLinus Torvalds } 7561da177e4SLinus Torvalds 7579a8d248eSJ. Bruce Fields /* 7589a8d248eSJ. Bruce Fields * Sync a file 7599a8d248eSJ. Bruce Fields * As this calls fsync (not fdatasync) there is no need for a write_inode 7609a8d248eSJ. Bruce Fields * after it. 7619a8d248eSJ. Bruce Fields */ 7629a8d248eSJ. Bruce Fields static inline int nfsd_dosync(struct file *filp, struct dentry *dp, 7639a8d248eSJ. Bruce Fields const struct file_operations *fop) 7649a8d248eSJ. Bruce Fields { 7659a8d248eSJ. Bruce Fields struct inode *inode = dp->d_inode; 7669a8d248eSJ. Bruce Fields int (*fsync) (struct file *, struct dentry *, int); 7679a8d248eSJ. Bruce Fields int err; 7689a8d248eSJ. Bruce Fields 7699a8d248eSJ. Bruce Fields err = filemap_fdatawrite(inode->i_mapping); 7709a8d248eSJ. Bruce Fields if (err == 0 && fop && (fsync = fop->fsync)) 7719a8d248eSJ. Bruce Fields err = fsync(filp, dp, 0); 7729a8d248eSJ. Bruce Fields if (err == 0) 7739a8d248eSJ. Bruce Fields err = filemap_fdatawait(inode->i_mapping); 7749a8d248eSJ. Bruce Fields 7759a8d248eSJ. Bruce Fields return err; 7769a8d248eSJ. Bruce Fields } 7779a8d248eSJ. Bruce Fields 778a334de28SDavid Shaw static int 7791da177e4SLinus Torvalds nfsd_sync(struct file *filp) 7801da177e4SLinus Torvalds { 7819a8d248eSJ. Bruce Fields int err; 7829a8d248eSJ. Bruce Fields struct inode *inode = filp->f_path.dentry->d_inode; 7839a8d248eSJ. Bruce Fields dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name); 7849a8d248eSJ. Bruce Fields mutex_lock(&inode->i_mutex); 7859a8d248eSJ. Bruce Fields err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op); 7869a8d248eSJ. Bruce Fields mutex_unlock(&inode->i_mutex); 7879a8d248eSJ. Bruce Fields 7889a8d248eSJ. Bruce Fields return err; 7891da177e4SLinus Torvalds } 7901da177e4SLinus Torvalds 791f193fbabSYAMAMOTO Takashi int 7929a8d248eSJ. Bruce Fields nfsd_sync_dir(struct dentry *dp) 7931da177e4SLinus Torvalds { 7949a8d248eSJ. Bruce Fields return nfsd_dosync(NULL, dp, dp->d_inode->i_fop); 7951da177e4SLinus Torvalds } 7961da177e4SLinus Torvalds 7971da177e4SLinus Torvalds /* 7981da177e4SLinus Torvalds * Obtain the readahead parameters for the file 7991da177e4SLinus Torvalds * specified by (dev, ino). 8001da177e4SLinus Torvalds */ 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvalds static inline struct raparms * 8031da177e4SLinus Torvalds nfsd_get_raparms(dev_t dev, ino_t ino) 8041da177e4SLinus Torvalds { 8051da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 8061da177e4SLinus Torvalds int depth = 0; 807fce1456aSGreg Banks unsigned int hash; 808fce1456aSGreg Banks struct raparm_hbucket *rab; 8091da177e4SLinus Torvalds 810fce1456aSGreg Banks hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; 811fce1456aSGreg Banks rab = &raparm_hash[hash]; 812fce1456aSGreg Banks 813fce1456aSGreg Banks spin_lock(&rab->pb_lock); 814fce1456aSGreg Banks for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { 8151da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 8161da177e4SLinus Torvalds goto found; 8171da177e4SLinus Torvalds depth++; 8181da177e4SLinus Torvalds if (ra->p_count == 0) 8191da177e4SLinus Torvalds frap = rap; 8201da177e4SLinus Torvalds } 8211da177e4SLinus Torvalds depth = nfsdstats.ra_size*11/10; 8221da177e4SLinus Torvalds if (!frap) { 823fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8241da177e4SLinus Torvalds return NULL; 8251da177e4SLinus Torvalds } 8261da177e4SLinus Torvalds rap = frap; 8271da177e4SLinus Torvalds ra = *frap; 8281da177e4SLinus Torvalds ra->p_dev = dev; 8291da177e4SLinus Torvalds ra->p_ino = ino; 8301da177e4SLinus Torvalds ra->p_set = 0; 831fce1456aSGreg Banks ra->p_hindex = hash; 8321da177e4SLinus Torvalds found: 833fce1456aSGreg Banks if (rap != &rab->pb_head) { 8341da177e4SLinus Torvalds *rap = ra->p_next; 835fce1456aSGreg Banks ra->p_next = rab->pb_head; 836fce1456aSGreg Banks rab->pb_head = ra; 8371da177e4SLinus Torvalds } 8381da177e4SLinus Torvalds ra->p_count++; 8391da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 840fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8411da177e4SLinus Torvalds return ra; 8421da177e4SLinus Torvalds } 8431da177e4SLinus Torvalds 8441da177e4SLinus Torvalds /* 845cf8208d0SJens Axboe * Grab and keep cached pages associated with a file in the svc_rqst 846cf8208d0SJens Axboe * so that they can be passed to the network sendmsg/sendpage routines 847cf8208d0SJens Axboe * directly. They will be released after the sending has completed. 8481da177e4SLinus Torvalds */ 8491da177e4SLinus Torvalds static int 850cf8208d0SJens Axboe nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, 851cf8208d0SJens Axboe struct splice_desc *sd) 8521da177e4SLinus Torvalds { 853cf8208d0SJens Axboe struct svc_rqst *rqstp = sd->u.data; 85444524359SNeilBrown struct page **pp = rqstp->rq_respages + rqstp->rq_resused; 855cf8208d0SJens Axboe struct page *page = buf->page; 856cf8208d0SJens Axboe size_t size; 857cf8208d0SJens Axboe int ret; 8581da177e4SLinus Torvalds 859cac36bb0SJens Axboe ret = buf->ops->confirm(pipe, buf); 860cf8208d0SJens Axboe if (unlikely(ret)) 861cf8208d0SJens Axboe return ret; 862cf8208d0SJens Axboe 863cf8208d0SJens Axboe size = sd->len; 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 8661da177e4SLinus Torvalds get_page(page); 86744524359SNeilBrown put_page(*pp); 86844524359SNeilBrown *pp = page; 86944524359SNeilBrown rqstp->rq_resused++; 870cf8208d0SJens Axboe rqstp->rq_res.page_base = buf->offset; 8711da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 87244524359SNeilBrown } else if (page != pp[-1]) { 8731da177e4SLinus Torvalds get_page(page); 874250f3915SNeilBrown if (*pp) 87544524359SNeilBrown put_page(*pp); 87644524359SNeilBrown *pp = page; 87744524359SNeilBrown rqstp->rq_resused++; 8781da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 87944524359SNeilBrown } else 8801da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds return size; 8831da177e4SLinus Torvalds } 8841da177e4SLinus Torvalds 885cf8208d0SJens Axboe static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, 886cf8208d0SJens Axboe struct splice_desc *sd) 887cf8208d0SJens Axboe { 888cf8208d0SJens Axboe return __splice_from_pipe(pipe, sd, nfsd_splice_actor); 889cf8208d0SJens Axboe } 890cf8208d0SJens Axboe 891a8754beeSDave Hansen static inline int svc_msnfs(struct svc_fh *ffhp) 892a8754beeSDave Hansen { 893a8754beeSDave Hansen #ifdef MSNFS 894a8754beeSDave Hansen return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS); 895a8754beeSDave Hansen #else 896a8754beeSDave Hansen return 0; 897a8754beeSDave Hansen #endif 898a8754beeSDave Hansen } 899a8754beeSDave Hansen 9006264d69dSAl Viro static __be32 9011da177e4SLinus Torvalds nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 9021da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 9031da177e4SLinus Torvalds { 9041da177e4SLinus Torvalds struct inode *inode; 9051da177e4SLinus Torvalds struct raparms *ra; 9061da177e4SLinus Torvalds mm_segment_t oldfs; 9076264d69dSAl Viro __be32 err; 9086264d69dSAl Viro int host_err; 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds err = nfserr_perm; 9117eaa36e2SJosef "Jeff" Sipek inode = file->f_path.dentry->d_inode; 912a8754beeSDave Hansen 913a8754beeSDave Hansen if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count)) 9141da177e4SLinus Torvalds goto out; 9151da177e4SLinus Torvalds 9161da177e4SLinus Torvalds /* Get readahead parameters */ 9171da177e4SLinus Torvalds ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds if (ra && ra->p_set) 9201da177e4SLinus Torvalds file->f_ra = ra->p_ra; 9211da177e4SLinus Torvalds 922cf8208d0SJens Axboe if (file->f_op->splice_read && rqstp->rq_splice_ok) { 923cf8208d0SJens Axboe struct splice_desc sd = { 924cf8208d0SJens Axboe .len = 0, 925cf8208d0SJens Axboe .total_len = *count, 926cf8208d0SJens Axboe .pos = offset, 927cf8208d0SJens Axboe .u.data = rqstp, 928cf8208d0SJens Axboe }; 929cf8208d0SJens Axboe 9304fbef206SJens Axboe rqstp->rq_resused = 1; 931cf8208d0SJens Axboe host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); 9321da177e4SLinus Torvalds } else { 9331da177e4SLinus Torvalds oldfs = get_fs(); 9341da177e4SLinus Torvalds set_fs(KERNEL_DS); 9356264d69dSAl Viro host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); 9361da177e4SLinus Torvalds set_fs(oldfs); 9371da177e4SLinus Torvalds } 9381da177e4SLinus Torvalds 9391da177e4SLinus Torvalds /* Write back readahead params */ 9401da177e4SLinus Torvalds if (ra) { 941fce1456aSGreg Banks struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; 942fce1456aSGreg Banks spin_lock(&rab->pb_lock); 9431da177e4SLinus Torvalds ra->p_ra = file->f_ra; 9441da177e4SLinus Torvalds ra->p_set = 1; 9451da177e4SLinus Torvalds ra->p_count--; 946fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 9471da177e4SLinus Torvalds } 9481da177e4SLinus Torvalds 9496264d69dSAl Viro if (host_err >= 0) { 9506264d69dSAl Viro nfsdstats.io_read += host_err; 9516264d69dSAl Viro *count = host_err; 9521da177e4SLinus Torvalds err = 0; 9537eaa36e2SJosef "Jeff" Sipek fsnotify_access(file->f_path.dentry); 9541da177e4SLinus Torvalds } else 9556264d69dSAl Viro err = nfserrno(host_err); 9561da177e4SLinus Torvalds out: 9571da177e4SLinus Torvalds return err; 9581da177e4SLinus Torvalds } 9591da177e4SLinus Torvalds 9609f708e40SNeil Brown static void kill_suid(struct dentry *dentry) 9619f708e40SNeil Brown { 9629f708e40SNeil Brown struct iattr ia; 963b5376771SSerge E. Hallyn ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; 9649f708e40SNeil Brown 9651b1dcc1bSJes Sorensen mutex_lock(&dentry->d_inode->i_mutex); 9669f708e40SNeil Brown notify_change(dentry, &ia); 9671b1dcc1bSJes Sorensen mutex_unlock(&dentry->d_inode->i_mutex); 9689f708e40SNeil Brown } 9699f708e40SNeil Brown 9706264d69dSAl Viro static __be32 9711da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 9721da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 97331dec253SDavid Shaw unsigned long *cnt, int *stablep) 9741da177e4SLinus Torvalds { 9751da177e4SLinus Torvalds struct svc_export *exp; 9761da177e4SLinus Torvalds struct dentry *dentry; 9771da177e4SLinus Torvalds struct inode *inode; 9781da177e4SLinus Torvalds mm_segment_t oldfs; 9796264d69dSAl Viro __be32 err = 0; 9806264d69dSAl Viro int host_err; 9811da177e4SLinus Torvalds int stable = *stablep; 9821da177e4SLinus Torvalds 98345bd3b3dSNeilBrown #ifdef MSNFS 9841da177e4SLinus Torvalds err = nfserr_perm; 9851da177e4SLinus Torvalds 9861da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 98731dec253SDavid Shaw (!lock_may_write(file->f_path.dentry->d_inode, offset, *cnt))) 9881da177e4SLinus Torvalds goto out; 9891da177e4SLinus Torvalds #endif 9901da177e4SLinus Torvalds 9917eaa36e2SJosef "Jeff" Sipek dentry = file->f_path.dentry; 9921da177e4SLinus Torvalds inode = dentry->d_inode; 9931da177e4SLinus Torvalds exp = fhp->fh_export; 9941da177e4SLinus Torvalds 9951da177e4SLinus Torvalds /* 9961da177e4SLinus Torvalds * Request sync writes if 9971da177e4SLinus Torvalds * - the sync export option has been set, or 9981da177e4SLinus Torvalds * - the client requested O_SYNC behavior (NFSv3 feature). 9991da177e4SLinus Torvalds * - The file system doesn't support fsync(). 10001da177e4SLinus Torvalds * When gathered writes have been configured for this volume, 10011da177e4SLinus Torvalds * flushing the data to disk is handled separately below. 10021da177e4SLinus Torvalds */ 10031da177e4SLinus Torvalds 10043ba15148SHarvey Harrison if (!file->f_op->fsync) {/* COMMIT3 cannot work */ 10051da177e4SLinus Torvalds stable = 2; 10061da177e4SLinus Torvalds *stablep = 2; /* FILE_SYNC */ 10071da177e4SLinus Torvalds } 10081da177e4SLinus Torvalds 10091da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 10101da177e4SLinus Torvalds stable = 0; 1011db1dd4d3SJonathan Corbet if (stable && !EX_WGATHER(exp)) { 1012db1dd4d3SJonathan Corbet spin_lock(&file->f_lock); 10131da177e4SLinus Torvalds file->f_flags |= O_SYNC; 1014db1dd4d3SJonathan Corbet spin_unlock(&file->f_lock); 1015db1dd4d3SJonathan Corbet } 10161da177e4SLinus Torvalds 10171da177e4SLinus Torvalds /* Write the data. */ 10181da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 10196264d69dSAl Viro host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); 10201da177e4SLinus Torvalds set_fs(oldfs); 10216264d69dSAl Viro if (host_err >= 0) { 1022a0d24b29SWei Yongjun *cnt = host_err; 102331dec253SDavid Shaw nfsdstats.io_write += host_err; 10247eaa36e2SJosef "Jeff" Sipek fsnotify_modify(file->f_path.dentry); 10251da177e4SLinus Torvalds } 10261da177e4SLinus Torvalds 10271da177e4SLinus Torvalds /* clear setuid/setgid flag after write */ 10286264d69dSAl Viro if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) 10299f708e40SNeil Brown kill_suid(dentry); 10301da177e4SLinus Torvalds 10316264d69dSAl Viro if (host_err >= 0 && stable) { 10321da177e4SLinus Torvalds static ino_t last_ino; 10331da177e4SLinus Torvalds static dev_t last_dev; 10341da177e4SLinus Torvalds 10351da177e4SLinus Torvalds /* 10361da177e4SLinus Torvalds * Gathered writes: If another process is currently 10371da177e4SLinus Torvalds * writing to the file, there's a high chance 10381da177e4SLinus Torvalds * this is another nfsd (triggered by a bulk write 10391da177e4SLinus Torvalds * from a client's biod). Rather than syncing the 10401da177e4SLinus Torvalds * file with each write request, we sleep for 10 msec. 10411da177e4SLinus Torvalds * 10421da177e4SLinus Torvalds * I don't know if this roughly approximates 10431da177e4SLinus Torvalds * C. Juszak's idea of gathered writes, but it's a 10441da177e4SLinus Torvalds * nice and simple solution (IMHO), and it seems to 10451da177e4SLinus Torvalds * work:-) 10461da177e4SLinus Torvalds */ 10471da177e4SLinus Torvalds if (EX_WGATHER(exp)) { 10481da177e4SLinus Torvalds if (atomic_read(&inode->i_writecount) > 1 10491da177e4SLinus Torvalds || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 1050ba25f9dcSPavel Emelyanov dprintk("nfsd: write defer %d\n", task_pid_nr(current)); 10511da177e4SLinus Torvalds msleep(10); 1052ba25f9dcSPavel Emelyanov dprintk("nfsd: write resume %d\n", task_pid_nr(current)); 10531da177e4SLinus Torvalds } 10541da177e4SLinus Torvalds 10551da177e4SLinus Torvalds if (inode->i_state & I_DIRTY) { 1056ba25f9dcSPavel Emelyanov dprintk("nfsd: write sync %d\n", task_pid_nr(current)); 10576264d69dSAl Viro host_err=nfsd_sync(file); 10581da177e4SLinus Torvalds } 10591da177e4SLinus Torvalds #if 0 10601da177e4SLinus Torvalds wake_up(&inode->i_wait); 10611da177e4SLinus Torvalds #endif 10621da177e4SLinus Torvalds } 10631da177e4SLinus Torvalds last_ino = inode->i_ino; 10641da177e4SLinus Torvalds last_dev = inode->i_sb->s_dev; 10651da177e4SLinus Torvalds } 10661da177e4SLinus Torvalds 10676264d69dSAl Viro dprintk("nfsd: write complete host_err=%d\n", host_err); 1068a0d24b29SWei Yongjun if (host_err >= 0) 10691da177e4SLinus Torvalds err = 0; 1070a0d24b29SWei Yongjun else 10716264d69dSAl Viro err = nfserrno(host_err); 10721da177e4SLinus Torvalds out: 10731da177e4SLinus Torvalds return err; 10741da177e4SLinus Torvalds } 10751da177e4SLinus Torvalds 10761da177e4SLinus Torvalds /* 10771da177e4SLinus Torvalds * Read data from a file. count must contain the requested read count 10781da177e4SLinus Torvalds * on entry. On return, *count contains the number of bytes actually read. 10791da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10801da177e4SLinus Torvalds */ 10816264d69dSAl Viro __be32 10821da177e4SLinus Torvalds nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10831da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 10841da177e4SLinus Torvalds unsigned long *count) 10851da177e4SLinus Torvalds { 10866264d69dSAl Viro __be32 err; 10871da177e4SLinus Torvalds 10881da177e4SLinus Torvalds if (file) { 10890ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 10908837abcaSMiklos Szeredi NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); 10911da177e4SLinus Torvalds if (err) 10921da177e4SLinus Torvalds goto out; 10931da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 10941da177e4SLinus Torvalds } else { 10958837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 10961da177e4SLinus Torvalds if (err) 10971da177e4SLinus Torvalds goto out; 10981da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 10991da177e4SLinus Torvalds nfsd_close(file); 11001da177e4SLinus Torvalds } 11011da177e4SLinus Torvalds out: 11021da177e4SLinus Torvalds return err; 11031da177e4SLinus Torvalds } 11041da177e4SLinus Torvalds 11051da177e4SLinus Torvalds /* 11061da177e4SLinus Torvalds * Write data to a file. 11071da177e4SLinus Torvalds * The stable flag requests synchronous writes. 11081da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 11091da177e4SLinus Torvalds */ 11106264d69dSAl Viro __be32 11111da177e4SLinus Torvalds nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 111231dec253SDavid Shaw loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, 11131da177e4SLinus Torvalds int *stablep) 11141da177e4SLinus Torvalds { 11156264d69dSAl Viro __be32 err = 0; 11161da177e4SLinus Torvalds 11171da177e4SLinus Torvalds if (file) { 11180ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 11198837abcaSMiklos Szeredi NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); 11201da177e4SLinus Torvalds if (err) 11211da177e4SLinus Torvalds goto out; 11221da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, 11231da177e4SLinus Torvalds stablep); 11241da177e4SLinus Torvalds } else { 11258837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 11261da177e4SLinus Torvalds if (err) 11271da177e4SLinus Torvalds goto out; 11281da177e4SLinus Torvalds 11291da177e4SLinus Torvalds if (cnt) 11301da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, 11311da177e4SLinus Torvalds cnt, stablep); 11321da177e4SLinus Torvalds nfsd_close(file); 11331da177e4SLinus Torvalds } 11341da177e4SLinus Torvalds out: 11351da177e4SLinus Torvalds return err; 11361da177e4SLinus Torvalds } 11371da177e4SLinus Torvalds 11381da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 11391da177e4SLinus Torvalds /* 11401da177e4SLinus Torvalds * Commit all pending writes to stable storage. 11411da177e4SLinus Torvalds * Strictly speaking, we could sync just the indicated file region here, 11421da177e4SLinus Torvalds * but there's currently no way we can ask the VFS to do so. 11431da177e4SLinus Torvalds * 11441da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 11451da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 11461da177e4SLinus Torvalds */ 11476264d69dSAl Viro __be32 11481da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 11491da177e4SLinus Torvalds loff_t offset, unsigned long count) 11501da177e4SLinus Torvalds { 11511da177e4SLinus Torvalds struct file *file; 11526264d69dSAl Viro __be32 err; 11531da177e4SLinus Torvalds 11541da177e4SLinus Torvalds if ((u64)count > ~(u64)offset) 11551da177e4SLinus Torvalds return nfserr_inval; 11561da177e4SLinus Torvalds 11578837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 11588837abcaSMiklos Szeredi if (err) 11591da177e4SLinus Torvalds return err; 11601da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 11611da177e4SLinus Torvalds if (file->f_op && file->f_op->fsync) { 116245bd3b3dSNeilBrown err = nfserrno(nfsd_sync(file)); 11631da177e4SLinus Torvalds } else { 11641da177e4SLinus Torvalds err = nfserr_notsupp; 11651da177e4SLinus Torvalds } 11661da177e4SLinus Torvalds } 11671da177e4SLinus Torvalds 11681da177e4SLinus Torvalds nfsd_close(file); 11691da177e4SLinus Torvalds return err; 11701da177e4SLinus Torvalds } 11711da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 11721da177e4SLinus Torvalds 1173f2b0dee2SAdrian Bunk static __be32 11745c002b3bSJ. Bruce Fields nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, 11755c002b3bSJ. Bruce Fields struct iattr *iap) 11765c002b3bSJ. Bruce Fields { 11775c002b3bSJ. Bruce Fields /* 11785c002b3bSJ. Bruce Fields * Mode has already been set earlier in create: 11795c002b3bSJ. Bruce Fields */ 11805c002b3bSJ. Bruce Fields iap->ia_valid &= ~ATTR_MODE; 11815c002b3bSJ. Bruce Fields /* 11825c002b3bSJ. Bruce Fields * Setting uid/gid works only for root. Irix appears to 11835c002b3bSJ. Bruce Fields * send along the gid on create when it tries to implement 11845c002b3bSJ. Bruce Fields * setgid directories via NFS: 11855c002b3bSJ. Bruce Fields */ 11865cc0a840SDavid Howells if (current_fsuid() != 0) 11875c002b3bSJ. Bruce Fields iap->ia_valid &= ~(ATTR_UID|ATTR_GID); 11885c002b3bSJ. Bruce Fields if (iap->ia_valid) 11895c002b3bSJ. Bruce Fields return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 11905c002b3bSJ. Bruce Fields return 0; 11915c002b3bSJ. Bruce Fields } 11925c002b3bSJ. Bruce Fields 11934ac35c2fSwengang wang /* HPUX client sometimes creates a file in mode 000, and sets size to 0. 11944ac35c2fSwengang wang * setting size to 0 may fail for some specific file systems by the permission 11954ac35c2fSwengang wang * checking which requires WRITE permission but the mode is 000. 11964ac35c2fSwengang wang * we ignore the resizing(to 0) on the just new created file, since the size is 11974ac35c2fSwengang wang * 0 after file created. 11984ac35c2fSwengang wang * 11994ac35c2fSwengang wang * call this only after vfs_create() is called. 12004ac35c2fSwengang wang * */ 12014ac35c2fSwengang wang static void 12024ac35c2fSwengang wang nfsd_check_ignore_resizing(struct iattr *iap) 12034ac35c2fSwengang wang { 12044ac35c2fSwengang wang if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) 12054ac35c2fSwengang wang iap->ia_valid &= ~ATTR_SIZE; 12064ac35c2fSwengang wang } 12074ac35c2fSwengang wang 12081da177e4SLinus Torvalds /* 12091da177e4SLinus Torvalds * Create a file (regular, directory, device, fifo); UNIX sockets 12101da177e4SLinus Torvalds * not yet implemented. 12111da177e4SLinus Torvalds * If the response fh has been verified, the parent directory should 12121da177e4SLinus Torvalds * already be locked. Note that the parent directory is left locked. 12131da177e4SLinus Torvalds * 12141da177e4SLinus Torvalds * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 12151da177e4SLinus Torvalds */ 12166264d69dSAl Viro __be32 12171da177e4SLinus Torvalds nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 12181da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 12191da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 12201da177e4SLinus Torvalds { 12211da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 12221da177e4SLinus Torvalds struct inode *dirp; 12236264d69dSAl Viro __be32 err; 12245c002b3bSJ. Bruce Fields __be32 err2; 12256264d69dSAl Viro int host_err; 12261da177e4SLinus Torvalds 12271da177e4SLinus Torvalds err = nfserr_perm; 12281da177e4SLinus Torvalds if (!flen) 12291da177e4SLinus Torvalds goto out; 12301da177e4SLinus Torvalds err = nfserr_exist; 12311da177e4SLinus Torvalds if (isdotent(fname, flen)) 12321da177e4SLinus Torvalds goto out; 12331da177e4SLinus Torvalds 12348837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 12351da177e4SLinus Torvalds if (err) 12361da177e4SLinus Torvalds goto out; 12371da177e4SLinus Torvalds 12381da177e4SLinus Torvalds dentry = fhp->fh_dentry; 12391da177e4SLinus Torvalds dirp = dentry->d_inode; 12401da177e4SLinus Torvalds 12411da177e4SLinus Torvalds err = nfserr_notdir; 1242acfa4380SAl Viro if (!dirp->i_op->lookup) 12431da177e4SLinus Torvalds goto out; 12441da177e4SLinus Torvalds /* 12451da177e4SLinus Torvalds * Check whether the response file handle has been verified yet. 12461da177e4SLinus Torvalds * If it has, the parent directory should already be locked. 12471da177e4SLinus Torvalds */ 12481da177e4SLinus Torvalds if (!resfhp->fh_dentry) { 12491da177e4SLinus Torvalds /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ 125012fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 12511da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 12526264d69dSAl Viro host_err = PTR_ERR(dchild); 12531da177e4SLinus Torvalds if (IS_ERR(dchild)) 12541da177e4SLinus Torvalds goto out_nfserr; 12551da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 12561da177e4SLinus Torvalds if (err) 12571da177e4SLinus Torvalds goto out; 12581da177e4SLinus Torvalds } else { 12591da177e4SLinus Torvalds /* called from nfsd_proc_create */ 12601da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 12611da177e4SLinus Torvalds if (!fhp->fh_locked) { 12621da177e4SLinus Torvalds /* not actually possible */ 12631da177e4SLinus Torvalds printk(KERN_ERR 12641da177e4SLinus Torvalds "nfsd_create: parent %s/%s not locked!\n", 12651da177e4SLinus Torvalds dentry->d_parent->d_name.name, 12661da177e4SLinus Torvalds dentry->d_name.name); 1267d75f2b9fSAl Viro err = nfserr_io; 12681da177e4SLinus Torvalds goto out; 12691da177e4SLinus Torvalds } 12701da177e4SLinus Torvalds } 12711da177e4SLinus Torvalds /* 12721da177e4SLinus Torvalds * Make sure the child dentry is still negative ... 12731da177e4SLinus Torvalds */ 12741da177e4SLinus Torvalds err = nfserr_exist; 12751da177e4SLinus Torvalds if (dchild->d_inode) { 12761da177e4SLinus Torvalds dprintk("nfsd_create: dentry %s/%s not negative!\n", 12771da177e4SLinus Torvalds dentry->d_name.name, dchild->d_name.name); 12781da177e4SLinus Torvalds goto out; 12791da177e4SLinus Torvalds } 12801da177e4SLinus Torvalds 12811da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 12821da177e4SLinus Torvalds iap->ia_mode = 0; 12831da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 12841da177e4SLinus Torvalds 128507cad1d2SMiklos Szeredi err = nfserr_inval; 128607cad1d2SMiklos Szeredi if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { 128707cad1d2SMiklos Szeredi printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", 128807cad1d2SMiklos Szeredi type); 128907cad1d2SMiklos Szeredi goto out; 129007cad1d2SMiklos Szeredi } 129107cad1d2SMiklos Szeredi 129207cad1d2SMiklos Szeredi host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 129307cad1d2SMiklos Szeredi if (host_err) 129407cad1d2SMiklos Szeredi goto out_nfserr; 129507cad1d2SMiklos Szeredi 12961da177e4SLinus Torvalds /* 12971da177e4SLinus Torvalds * Get the dir op function pointer. 12981da177e4SLinus Torvalds */ 1299088406bcSJ. Bruce Fields err = 0; 13001da177e4SLinus Torvalds switch (type) { 13011da177e4SLinus Torvalds case S_IFREG: 13026264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 13034ac35c2fSwengang wang if (!host_err) 13044ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 13051da177e4SLinus Torvalds break; 13061da177e4SLinus Torvalds case S_IFDIR: 13076264d69dSAl Viro host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); 13081da177e4SLinus Torvalds break; 13091da177e4SLinus Torvalds case S_IFCHR: 13101da177e4SLinus Torvalds case S_IFBLK: 13111da177e4SLinus Torvalds case S_IFIFO: 13121da177e4SLinus Torvalds case S_IFSOCK: 13136264d69dSAl Viro host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 13141da177e4SLinus Torvalds break; 1315463c3197SDave Hansen } 1316463c3197SDave Hansen if (host_err < 0) { 1317463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1318463c3197SDave Hansen goto out_nfserr; 1319463c3197SDave Hansen } 13201da177e4SLinus Torvalds 13211da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 132245bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(dentry)); 13231da177e4SLinus Torvalds write_inode_now(dchild->d_inode, 1); 13241da177e4SLinus Torvalds } 13251da177e4SLinus Torvalds 13265c002b3bSJ. Bruce Fields err2 = nfsd_create_setattr(rqstp, resfhp, iap); 1327f193fbabSYAMAMOTO Takashi if (err2) 1328f193fbabSYAMAMOTO Takashi err = err2; 1329463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 13301da177e4SLinus Torvalds /* 13311da177e4SLinus Torvalds * Update the file handle to get the new inode info. 13321da177e4SLinus Torvalds */ 13331da177e4SLinus Torvalds if (!err) 13341da177e4SLinus Torvalds err = fh_update(resfhp); 13351da177e4SLinus Torvalds out: 13361da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 13371da177e4SLinus Torvalds dput(dchild); 13381da177e4SLinus Torvalds return err; 13391da177e4SLinus Torvalds 13401da177e4SLinus Torvalds out_nfserr: 13416264d69dSAl Viro err = nfserrno(host_err); 13421da177e4SLinus Torvalds goto out; 13431da177e4SLinus Torvalds } 13441da177e4SLinus Torvalds 13451da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 13461da177e4SLinus Torvalds /* 13471da177e4SLinus Torvalds * NFSv3 version of nfsd_create 13481da177e4SLinus Torvalds */ 13496264d69dSAl Viro __be32 13501da177e4SLinus Torvalds nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, 13511da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 13521da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 135381ac95c5SJ. Bruce Fields int *truncp, int *created) 13541da177e4SLinus Torvalds { 13551da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 13561da177e4SLinus Torvalds struct inode *dirp; 13576264d69dSAl Viro __be32 err; 13585c002b3bSJ. Bruce Fields __be32 err2; 13596264d69dSAl Viro int host_err; 13601da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 13611da177e4SLinus Torvalds 13621da177e4SLinus Torvalds err = nfserr_perm; 13631da177e4SLinus Torvalds if (!flen) 13641da177e4SLinus Torvalds goto out; 13651da177e4SLinus Torvalds err = nfserr_exist; 13661da177e4SLinus Torvalds if (isdotent(fname, flen)) 13671da177e4SLinus Torvalds goto out; 13681da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 13691da177e4SLinus Torvalds iap->ia_mode = 0; 13708837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 13711da177e4SLinus Torvalds if (err) 13721da177e4SLinus Torvalds goto out; 13731da177e4SLinus Torvalds 13741da177e4SLinus Torvalds dentry = fhp->fh_dentry; 13751da177e4SLinus Torvalds dirp = dentry->d_inode; 13761da177e4SLinus Torvalds 13771da177e4SLinus Torvalds /* Get all the sanity checks out of the way before 13781da177e4SLinus Torvalds * we lock the parent. */ 13791da177e4SLinus Torvalds err = nfserr_notdir; 1380acfa4380SAl Viro if (!dirp->i_op->lookup) 13811da177e4SLinus Torvalds goto out; 138212fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 13831da177e4SLinus Torvalds 13841da177e4SLinus Torvalds /* 13851da177e4SLinus Torvalds * Compose the response file handle. 13861da177e4SLinus Torvalds */ 13871da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 13886264d69dSAl Viro host_err = PTR_ERR(dchild); 13891da177e4SLinus Torvalds if (IS_ERR(dchild)) 13901da177e4SLinus Torvalds goto out_nfserr; 13911da177e4SLinus Torvalds 13921da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 13931da177e4SLinus Torvalds if (err) 13941da177e4SLinus Torvalds goto out; 13951da177e4SLinus Torvalds 13961da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1397c397852cSPeter Staubach /* solaris7 gets confused (bugid 4218508) if these have 1398749997e5SJeff Layton * the high bit set, so just clear the high bits. If this is 1399749997e5SJeff Layton * ever changed to use different attrs for storing the 1400749997e5SJeff Layton * verifier, then do_open_lookup() will also need to be fixed 1401749997e5SJeff Layton * accordingly. 14021da177e4SLinus Torvalds */ 14031da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 14041da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 14051da177e4SLinus Torvalds } 14061da177e4SLinus Torvalds 1407463c3197SDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 1408463c3197SDave Hansen if (host_err) 1409463c3197SDave Hansen goto out_nfserr; 14101da177e4SLinus Torvalds if (dchild->d_inode) { 14111da177e4SLinus Torvalds err = 0; 14121da177e4SLinus Torvalds 14131da177e4SLinus Torvalds switch (createmode) { 14141da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 14151da177e4SLinus Torvalds if (! S_ISREG(dchild->d_inode->i_mode)) 14161da177e4SLinus Torvalds err = nfserr_exist; 14171da177e4SLinus Torvalds else if (truncp) { 14181da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 14191da177e4SLinus Torvalds * differently. we don't want to truncate the 14201da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 14211da177e4SLinus Torvalds * fails for some other reason. furthermore, 14221da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 14231da177e4SLinus Torvalds * according to spec! 14241da177e4SLinus Torvalds */ 14251da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 14261da177e4SLinus Torvalds } 14271da177e4SLinus Torvalds else { 14281da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 14291da177e4SLinus Torvalds goto set_attr; 14301da177e4SLinus Torvalds } 14311da177e4SLinus Torvalds break; 14321da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 14331da177e4SLinus Torvalds if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 14341da177e4SLinus Torvalds && dchild->d_inode->i_atime.tv_sec == v_atime 14351da177e4SLinus Torvalds && dchild->d_inode->i_size == 0 ) 14361da177e4SLinus Torvalds break; 14371da177e4SLinus Torvalds /* fallthru */ 14381da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 14391da177e4SLinus Torvalds err = nfserr_exist; 14401da177e4SLinus Torvalds } 1441463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14421da177e4SLinus Torvalds goto out; 14431da177e4SLinus Torvalds } 14441da177e4SLinus Torvalds 14456264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 1446463c3197SDave Hansen if (host_err < 0) { 1447463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14481da177e4SLinus Torvalds goto out_nfserr; 1449463c3197SDave Hansen } 145081ac95c5SJ. Bruce Fields if (created) 145181ac95c5SJ. Bruce Fields *created = 1; 14521da177e4SLinus Torvalds 14531da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 145445bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(dentry)); 14551da177e4SLinus Torvalds /* setattr will sync the child (or not) */ 14561da177e4SLinus Torvalds } 14571da177e4SLinus Torvalds 14584ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 14594ac35c2fSwengang wang 14601da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1461c397852cSPeter Staubach /* Cram the verifier into atime/mtime */ 14621da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 1463c397852cSPeter Staubach | ATTR_MTIME_SET|ATTR_ATIME_SET; 14641da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 14651da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 14661da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 14671da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 14681da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 14691da177e4SLinus Torvalds } 14701da177e4SLinus Torvalds 14711da177e4SLinus Torvalds set_attr: 14725c002b3bSJ. Bruce Fields err2 = nfsd_create_setattr(rqstp, resfhp, iap); 1473f193fbabSYAMAMOTO Takashi if (err2) 147445bd3b3dSNeilBrown err = err2; 1475f193fbabSYAMAMOTO Takashi 1476463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1477f193fbabSYAMAMOTO Takashi /* 1478f193fbabSYAMAMOTO Takashi * Update the filehandle to get the new inode info. 1479f193fbabSYAMAMOTO Takashi */ 1480f193fbabSYAMAMOTO Takashi if (!err) 1481f193fbabSYAMAMOTO Takashi err = fh_update(resfhp); 14821da177e4SLinus Torvalds 14831da177e4SLinus Torvalds out: 14841da177e4SLinus Torvalds fh_unlock(fhp); 14851da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 14861da177e4SLinus Torvalds dput(dchild); 14871da177e4SLinus Torvalds return err; 14881da177e4SLinus Torvalds 14891da177e4SLinus Torvalds out_nfserr: 14906264d69dSAl Viro err = nfserrno(host_err); 14911da177e4SLinus Torvalds goto out; 14921da177e4SLinus Torvalds } 14931da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 14941da177e4SLinus Torvalds 14951da177e4SLinus Torvalds /* 14961da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 14971da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 14981da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 14991da177e4SLinus Torvalds */ 15006264d69dSAl Viro __be32 15011da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 15021da177e4SLinus Torvalds { 15031da177e4SLinus Torvalds struct dentry *dentry; 15041da177e4SLinus Torvalds struct inode *inode; 15051da177e4SLinus Torvalds mm_segment_t oldfs; 15066264d69dSAl Viro __be32 err; 15076264d69dSAl Viro int host_err; 15081da177e4SLinus Torvalds 15098837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); 15101da177e4SLinus Torvalds if (err) 15111da177e4SLinus Torvalds goto out; 15121da177e4SLinus Torvalds 15131da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15141da177e4SLinus Torvalds inode = dentry->d_inode; 15151da177e4SLinus Torvalds 15161da177e4SLinus Torvalds err = nfserr_inval; 1517acfa4380SAl Viro if (!inode->i_op->readlink) 15181da177e4SLinus Torvalds goto out; 15191da177e4SLinus Torvalds 152054775491SJan Blunck touch_atime(fhp->fh_export->ex_path.mnt, dentry); 15211da177e4SLinus Torvalds /* N.B. Why does this call need a get_fs()?? 15221da177e4SLinus Torvalds * Remove the set_fs and watch the fireworks:-) --okir 15231da177e4SLinus Torvalds */ 15241da177e4SLinus Torvalds 15251da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 15266264d69dSAl Viro host_err = inode->i_op->readlink(dentry, buf, *lenp); 15271da177e4SLinus Torvalds set_fs(oldfs); 15281da177e4SLinus Torvalds 15296264d69dSAl Viro if (host_err < 0) 15301da177e4SLinus Torvalds goto out_nfserr; 15316264d69dSAl Viro *lenp = host_err; 15321da177e4SLinus Torvalds err = 0; 15331da177e4SLinus Torvalds out: 15341da177e4SLinus Torvalds return err; 15351da177e4SLinus Torvalds 15361da177e4SLinus Torvalds out_nfserr: 15376264d69dSAl Viro err = nfserrno(host_err); 15381da177e4SLinus Torvalds goto out; 15391da177e4SLinus Torvalds } 15401da177e4SLinus Torvalds 15411da177e4SLinus Torvalds /* 15421da177e4SLinus Torvalds * Create a symlink and look up its inode 15431da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 15441da177e4SLinus Torvalds */ 15456264d69dSAl Viro __be32 15461da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 15471da177e4SLinus Torvalds char *fname, int flen, 15481da177e4SLinus Torvalds char *path, int plen, 15491da177e4SLinus Torvalds struct svc_fh *resfhp, 15501da177e4SLinus Torvalds struct iattr *iap) 15511da177e4SLinus Torvalds { 15521da177e4SLinus Torvalds struct dentry *dentry, *dnew; 15536264d69dSAl Viro __be32 err, cerr; 15546264d69dSAl Viro int host_err; 15551da177e4SLinus Torvalds 15561da177e4SLinus Torvalds err = nfserr_noent; 15571da177e4SLinus Torvalds if (!flen || !plen) 15581da177e4SLinus Torvalds goto out; 15591da177e4SLinus Torvalds err = nfserr_exist; 15601da177e4SLinus Torvalds if (isdotent(fname, flen)) 15611da177e4SLinus Torvalds goto out; 15621da177e4SLinus Torvalds 15638837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 15641da177e4SLinus Torvalds if (err) 15651da177e4SLinus Torvalds goto out; 15661da177e4SLinus Torvalds fh_lock(fhp); 15671da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15681da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 15696264d69dSAl Viro host_err = PTR_ERR(dnew); 15701da177e4SLinus Torvalds if (IS_ERR(dnew)) 15711da177e4SLinus Torvalds goto out_nfserr; 15721da177e4SLinus Torvalds 157375c3f29dSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 157475c3f29dSDave Hansen if (host_err) 157575c3f29dSDave Hansen goto out_nfserr; 157675c3f29dSDave Hansen 15771da177e4SLinus Torvalds if (unlikely(path[plen] != 0)) { 15781da177e4SLinus Torvalds char *path_alloced = kmalloc(plen+1, GFP_KERNEL); 15791da177e4SLinus Torvalds if (path_alloced == NULL) 15806264d69dSAl Viro host_err = -ENOMEM; 15811da177e4SLinus Torvalds else { 15821da177e4SLinus Torvalds strncpy(path_alloced, path, plen); 15831da177e4SLinus Torvalds path_alloced[plen] = 0; 1584db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); 15851da177e4SLinus Torvalds kfree(path_alloced); 15861da177e4SLinus Torvalds } 15871da177e4SLinus Torvalds } else 1588db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path); 15891da177e4SLinus Torvalds 15906264d69dSAl Viro if (!host_err) { 15911da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 15926264d69dSAl Viro host_err = nfsd_sync_dir(dentry); 15936264d69dSAl Viro } 15946264d69dSAl Viro err = nfserrno(host_err); 15951da177e4SLinus Torvalds fh_unlock(fhp); 15961da177e4SLinus Torvalds 159775c3f29dSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 159875c3f29dSDave Hansen 15991da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 16001da177e4SLinus Torvalds dput(dnew); 16011da177e4SLinus Torvalds if (err==0) err = cerr; 16021da177e4SLinus Torvalds out: 16031da177e4SLinus Torvalds return err; 16041da177e4SLinus Torvalds 16051da177e4SLinus Torvalds out_nfserr: 16066264d69dSAl Viro err = nfserrno(host_err); 16071da177e4SLinus Torvalds goto out; 16081da177e4SLinus Torvalds } 16091da177e4SLinus Torvalds 16101da177e4SLinus Torvalds /* 16111da177e4SLinus Torvalds * Create a hardlink 16121da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16131da177e4SLinus Torvalds */ 16146264d69dSAl Viro __be32 16151da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 16161da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 16171da177e4SLinus Torvalds { 16181da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 16191da177e4SLinus Torvalds struct inode *dirp, *dest; 16206264d69dSAl Viro __be32 err; 16216264d69dSAl Viro int host_err; 16221da177e4SLinus Torvalds 16238837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); 16241da177e4SLinus Torvalds if (err) 16251da177e4SLinus Torvalds goto out; 16268837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP); 16271da177e4SLinus Torvalds if (err) 16281da177e4SLinus Torvalds goto out; 16291da177e4SLinus Torvalds 16301da177e4SLinus Torvalds err = nfserr_perm; 16311da177e4SLinus Torvalds if (!len) 16321da177e4SLinus Torvalds goto out; 16331da177e4SLinus Torvalds err = nfserr_exist; 16341da177e4SLinus Torvalds if (isdotent(name, len)) 16351da177e4SLinus Torvalds goto out; 16361da177e4SLinus Torvalds 163712fd3520SPeter Zijlstra fh_lock_nested(ffhp, I_MUTEX_PARENT); 16381da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 16391da177e4SLinus Torvalds dirp = ddir->d_inode; 16401da177e4SLinus Torvalds 16411da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 16426264d69dSAl Viro host_err = PTR_ERR(dnew); 16431da177e4SLinus Torvalds if (IS_ERR(dnew)) 16441da177e4SLinus Torvalds goto out_nfserr; 16451da177e4SLinus Torvalds 16461da177e4SLinus Torvalds dold = tfhp->fh_dentry; 16471da177e4SLinus Torvalds dest = dold->d_inode; 16481da177e4SLinus Torvalds 164975c3f29dSDave Hansen host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt); 165075c3f29dSDave Hansen if (host_err) { 165175c3f29dSDave Hansen err = nfserrno(host_err); 165275c3f29dSDave Hansen goto out_dput; 165375c3f29dSDave Hansen } 16546264d69dSAl Viro host_err = vfs_link(dold, dirp, dnew); 16556264d69dSAl Viro if (!host_err) { 16561da177e4SLinus Torvalds if (EX_ISSYNC(ffhp->fh_export)) { 165745bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(ddir)); 16581da177e4SLinus Torvalds write_inode_now(dest, 1); 16591da177e4SLinus Torvalds } 16606264d69dSAl Viro err = 0; 16611da177e4SLinus Torvalds } else { 16626264d69dSAl Viro if (host_err == -EXDEV && rqstp->rq_vers == 2) 16631da177e4SLinus Torvalds err = nfserr_acces; 16641da177e4SLinus Torvalds else 16656264d69dSAl Viro err = nfserrno(host_err); 16661da177e4SLinus Torvalds } 166775c3f29dSDave Hansen mnt_drop_write(tfhp->fh_export->ex_path.mnt); 166875c3f29dSDave Hansen out_dput: 16691da177e4SLinus Torvalds dput(dnew); 1670270d56e5SDavid M. Richter out_unlock: 1671270d56e5SDavid M. Richter fh_unlock(ffhp); 16721da177e4SLinus Torvalds out: 16731da177e4SLinus Torvalds return err; 16741da177e4SLinus Torvalds 16751da177e4SLinus Torvalds out_nfserr: 16766264d69dSAl Viro err = nfserrno(host_err); 1677270d56e5SDavid M. Richter goto out_unlock; 16781da177e4SLinus Torvalds } 16791da177e4SLinus Torvalds 16801da177e4SLinus Torvalds /* 16811da177e4SLinus Torvalds * Rename a file 16821da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16831da177e4SLinus Torvalds */ 16846264d69dSAl Viro __be32 16851da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 16861da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 16871da177e4SLinus Torvalds { 16881da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 16891da177e4SLinus Torvalds struct inode *fdir, *tdir; 16906264d69dSAl Viro __be32 err; 16916264d69dSAl Viro int host_err; 16921da177e4SLinus Torvalds 16938837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); 16941da177e4SLinus Torvalds if (err) 16951da177e4SLinus Torvalds goto out; 16968837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); 16971da177e4SLinus Torvalds if (err) 16981da177e4SLinus Torvalds goto out; 16991da177e4SLinus Torvalds 17001da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 17011da177e4SLinus Torvalds fdir = fdentry->d_inode; 17021da177e4SLinus Torvalds 17031da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 17041da177e4SLinus Torvalds tdir = tdentry->d_inode; 17051da177e4SLinus Torvalds 17061da177e4SLinus Torvalds err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; 1707a56f3937SNeilBrown if (ffhp->fh_export != tfhp->fh_export) 17081da177e4SLinus Torvalds goto out; 17091da177e4SLinus Torvalds 17101da177e4SLinus Torvalds err = nfserr_perm; 17111da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 17121da177e4SLinus Torvalds goto out; 17131da177e4SLinus Torvalds 17141da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 17151da177e4SLinus Torvalds * so do it by hand */ 17161da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 17171da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 1; 17181da177e4SLinus Torvalds fill_pre_wcc(ffhp); 17191da177e4SLinus Torvalds fill_pre_wcc(tfhp); 17201da177e4SLinus Torvalds 17211da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 17226264d69dSAl Viro host_err = PTR_ERR(odentry); 17231da177e4SLinus Torvalds if (IS_ERR(odentry)) 17241da177e4SLinus Torvalds goto out_nfserr; 17251da177e4SLinus Torvalds 17266264d69dSAl Viro host_err = -ENOENT; 17271da177e4SLinus Torvalds if (!odentry->d_inode) 17281da177e4SLinus Torvalds goto out_dput_old; 17296264d69dSAl Viro host_err = -EINVAL; 17301da177e4SLinus Torvalds if (odentry == trap) 17311da177e4SLinus Torvalds goto out_dput_old; 17321da177e4SLinus Torvalds 17331da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 17346264d69dSAl Viro host_err = PTR_ERR(ndentry); 17351da177e4SLinus Torvalds if (IS_ERR(ndentry)) 17361da177e4SLinus Torvalds goto out_dput_old; 17376264d69dSAl Viro host_err = -ENOTEMPTY; 17381da177e4SLinus Torvalds if (ndentry == trap) 17391da177e4SLinus Torvalds goto out_dput_new; 17401da177e4SLinus Torvalds 17419079b1ebSDave Hansen if (svc_msnfs(ffhp) && 17421da177e4SLinus Torvalds ((atomic_read(&odentry->d_count) > 1) 17431da177e4SLinus Torvalds || (atomic_read(&ndentry->d_count) > 1))) { 17446264d69dSAl Viro host_err = -EPERM; 17459079b1ebSDave Hansen goto out_dput_new; 17469079b1ebSDave Hansen } 17479079b1ebSDave Hansen 17489079b1ebSDave Hansen host_err = -EXDEV; 17499079b1ebSDave Hansen if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) 17509079b1ebSDave Hansen goto out_dput_new; 17519079b1ebSDave Hansen host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt); 17529079b1ebSDave Hansen if (host_err) 17539079b1ebSDave Hansen goto out_dput_new; 17549079b1ebSDave Hansen 17556264d69dSAl Viro host_err = vfs_rename(fdir, odentry, tdir, ndentry); 17566264d69dSAl Viro if (!host_err && EX_ISSYNC(tfhp->fh_export)) { 17576264d69dSAl Viro host_err = nfsd_sync_dir(tdentry); 17586264d69dSAl Viro if (!host_err) 17596264d69dSAl Viro host_err = nfsd_sync_dir(fdentry); 17601da177e4SLinus Torvalds } 17611da177e4SLinus Torvalds 17629079b1ebSDave Hansen mnt_drop_write(ffhp->fh_export->ex_path.mnt); 17639079b1ebSDave Hansen 17641da177e4SLinus Torvalds out_dput_new: 17651da177e4SLinus Torvalds dput(ndentry); 17661da177e4SLinus Torvalds out_dput_old: 17671da177e4SLinus Torvalds dput(odentry); 17681da177e4SLinus Torvalds out_nfserr: 17696264d69dSAl Viro err = nfserrno(host_err); 17701da177e4SLinus Torvalds 17711da177e4SLinus Torvalds /* we cannot reply on fh_unlock on the two filehandles, 17721da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 17731da177e4SLinus Torvalds * were the same, so again we do it by hand 17741da177e4SLinus Torvalds */ 17751da177e4SLinus Torvalds fill_post_wcc(ffhp); 17761da177e4SLinus Torvalds fill_post_wcc(tfhp); 17771da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 17781da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 0; 17791da177e4SLinus Torvalds 17801da177e4SLinus Torvalds out: 17811da177e4SLinus Torvalds return err; 17821da177e4SLinus Torvalds } 17831da177e4SLinus Torvalds 17841da177e4SLinus Torvalds /* 17851da177e4SLinus Torvalds * Unlink a file or directory 17861da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 17871da177e4SLinus Torvalds */ 17886264d69dSAl Viro __be32 17891da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 17901da177e4SLinus Torvalds char *fname, int flen) 17911da177e4SLinus Torvalds { 17921da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 17931da177e4SLinus Torvalds struct inode *dirp; 17946264d69dSAl Viro __be32 err; 17956264d69dSAl Viro int host_err; 17961da177e4SLinus Torvalds 17971da177e4SLinus Torvalds err = nfserr_acces; 17981da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 17991da177e4SLinus Torvalds goto out; 18008837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); 18011da177e4SLinus Torvalds if (err) 18021da177e4SLinus Torvalds goto out; 18031da177e4SLinus Torvalds 180412fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 18051da177e4SLinus Torvalds dentry = fhp->fh_dentry; 18061da177e4SLinus Torvalds dirp = dentry->d_inode; 18071da177e4SLinus Torvalds 18081da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 18096264d69dSAl Viro host_err = PTR_ERR(rdentry); 18101da177e4SLinus Torvalds if (IS_ERR(rdentry)) 18111da177e4SLinus Torvalds goto out_nfserr; 18121da177e4SLinus Torvalds 18131da177e4SLinus Torvalds if (!rdentry->d_inode) { 18141da177e4SLinus Torvalds dput(rdentry); 18151da177e4SLinus Torvalds err = nfserr_noent; 18161da177e4SLinus Torvalds goto out; 18171da177e4SLinus Torvalds } 18181da177e4SLinus Torvalds 18191da177e4SLinus Torvalds if (!type) 18201da177e4SLinus Torvalds type = rdentry->d_inode->i_mode & S_IFMT; 18211da177e4SLinus Torvalds 18220622753bSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 18230622753bSDave Hansen if (host_err) 18240622753bSDave Hansen goto out_nfserr; 18250622753bSDave Hansen 18261da177e4SLinus Torvalds if (type != S_IFDIR) { /* It's UNLINK */ 18271da177e4SLinus Torvalds #ifdef MSNFS 18281da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 18291da177e4SLinus Torvalds (atomic_read(&rdentry->d_count) > 1)) { 18306264d69dSAl Viro host_err = -EPERM; 18311da177e4SLinus Torvalds } else 18321da177e4SLinus Torvalds #endif 18336264d69dSAl Viro host_err = vfs_unlink(dirp, rdentry); 18341da177e4SLinus Torvalds } else { /* It's RMDIR */ 18356264d69dSAl Viro host_err = vfs_rmdir(dirp, rdentry); 18361da177e4SLinus Torvalds } 18371da177e4SLinus Torvalds 18381da177e4SLinus Torvalds dput(rdentry); 18391da177e4SLinus Torvalds 18406264d69dSAl Viro if (host_err) 18410622753bSDave Hansen goto out_drop; 18426264d69dSAl Viro if (EX_ISSYNC(fhp->fh_export)) 18436264d69dSAl Viro host_err = nfsd_sync_dir(dentry); 18441da177e4SLinus Torvalds 18450622753bSDave Hansen out_drop: 18460622753bSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 18471da177e4SLinus Torvalds out_nfserr: 18486264d69dSAl Viro err = nfserrno(host_err); 1849f193fbabSYAMAMOTO Takashi out: 1850f193fbabSYAMAMOTO Takashi return err; 18511da177e4SLinus Torvalds } 18521da177e4SLinus Torvalds 18531da177e4SLinus Torvalds /* 185414f7dd63SDavid Woodhouse * We do this buffering because we must not call back into the file 185514f7dd63SDavid Woodhouse * system's ->lookup() method from the filldir callback. That may well 185614f7dd63SDavid Woodhouse * deadlock a number of file systems. 185714f7dd63SDavid Woodhouse * 185814f7dd63SDavid Woodhouse * This is based heavily on the implementation of same in XFS. 185914f7dd63SDavid Woodhouse */ 186014f7dd63SDavid Woodhouse struct buffered_dirent { 186114f7dd63SDavid Woodhouse u64 ino; 186214f7dd63SDavid Woodhouse loff_t offset; 186314f7dd63SDavid Woodhouse int namlen; 186414f7dd63SDavid Woodhouse unsigned int d_type; 186514f7dd63SDavid Woodhouse char name[]; 186614f7dd63SDavid Woodhouse }; 186714f7dd63SDavid Woodhouse 186814f7dd63SDavid Woodhouse struct readdir_data { 186914f7dd63SDavid Woodhouse char *dirent; 187014f7dd63SDavid Woodhouse size_t used; 187153c9c5c0SAl Viro int full; 187214f7dd63SDavid Woodhouse }; 187314f7dd63SDavid Woodhouse 187414f7dd63SDavid Woodhouse static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, 187514f7dd63SDavid Woodhouse loff_t offset, u64 ino, unsigned int d_type) 187614f7dd63SDavid Woodhouse { 187714f7dd63SDavid Woodhouse struct readdir_data *buf = __buf; 187814f7dd63SDavid Woodhouse struct buffered_dirent *de = (void *)(buf->dirent + buf->used); 187914f7dd63SDavid Woodhouse unsigned int reclen; 188014f7dd63SDavid Woodhouse 188114f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); 188253c9c5c0SAl Viro if (buf->used + reclen > PAGE_SIZE) { 188353c9c5c0SAl Viro buf->full = 1; 188414f7dd63SDavid Woodhouse return -EINVAL; 188553c9c5c0SAl Viro } 188614f7dd63SDavid Woodhouse 188714f7dd63SDavid Woodhouse de->namlen = namlen; 188814f7dd63SDavid Woodhouse de->offset = offset; 188914f7dd63SDavid Woodhouse de->ino = ino; 189014f7dd63SDavid Woodhouse de->d_type = d_type; 189114f7dd63SDavid Woodhouse memcpy(de->name, name, namlen); 189214f7dd63SDavid Woodhouse buf->used += reclen; 189314f7dd63SDavid Woodhouse 189414f7dd63SDavid Woodhouse return 0; 189514f7dd63SDavid Woodhouse } 189614f7dd63SDavid Woodhouse 18972f9092e1SDavid Woodhouse static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func, 18982628b766SDavid Woodhouse struct readdir_cd *cdp, loff_t *offsetp) 18992628b766SDavid Woodhouse { 190014f7dd63SDavid Woodhouse struct readdir_data buf; 190114f7dd63SDavid Woodhouse struct buffered_dirent *de; 19022628b766SDavid Woodhouse int host_err; 190314f7dd63SDavid Woodhouse int size; 190414f7dd63SDavid Woodhouse loff_t offset; 19052628b766SDavid Woodhouse 190614f7dd63SDavid Woodhouse buf.dirent = (void *)__get_free_page(GFP_KERNEL); 190714f7dd63SDavid Woodhouse if (!buf.dirent) 19082f9092e1SDavid Woodhouse return nfserrno(-ENOMEM); 190914f7dd63SDavid Woodhouse 191014f7dd63SDavid Woodhouse offset = *offsetp; 19112628b766SDavid Woodhouse 191214f7dd63SDavid Woodhouse while (1) { 19132f9092e1SDavid Woodhouse struct inode *dir_inode = file->f_path.dentry->d_inode; 191414f7dd63SDavid Woodhouse unsigned int reclen; 191514f7dd63SDavid Woodhouse 1916b726e923SDoug Nazar cdp->err = nfserr_eof; /* will be cleared on successful read */ 191714f7dd63SDavid Woodhouse buf.used = 0; 191853c9c5c0SAl Viro buf.full = 0; 191914f7dd63SDavid Woodhouse 192014f7dd63SDavid Woodhouse host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf); 192153c9c5c0SAl Viro if (buf.full) 192253c9c5c0SAl Viro host_err = 0; 192353c9c5c0SAl Viro 192453c9c5c0SAl Viro if (host_err < 0) 192514f7dd63SDavid Woodhouse break; 192614f7dd63SDavid Woodhouse 192714f7dd63SDavid Woodhouse size = buf.used; 192814f7dd63SDavid Woodhouse 192914f7dd63SDavid Woodhouse if (!size) 193014f7dd63SDavid Woodhouse break; 193114f7dd63SDavid Woodhouse 19322f9092e1SDavid Woodhouse /* 19332f9092e1SDavid Woodhouse * Various filldir functions may end up calling back into 19342f9092e1SDavid Woodhouse * lookup_one_len() and the file system's ->lookup() method. 19352f9092e1SDavid Woodhouse * These expect i_mutex to be held, as it would within readdir. 19362f9092e1SDavid Woodhouse */ 19372f9092e1SDavid Woodhouse host_err = mutex_lock_killable(&dir_inode->i_mutex); 19382f9092e1SDavid Woodhouse if (host_err) 19392f9092e1SDavid Woodhouse break; 19402f9092e1SDavid Woodhouse 194114f7dd63SDavid Woodhouse de = (struct buffered_dirent *)buf.dirent; 194214f7dd63SDavid Woodhouse while (size > 0) { 194314f7dd63SDavid Woodhouse offset = de->offset; 194414f7dd63SDavid Woodhouse 194514f7dd63SDavid Woodhouse if (func(cdp, de->name, de->namlen, de->offset, 194614f7dd63SDavid Woodhouse de->ino, de->d_type)) 19472f9092e1SDavid Woodhouse break; 194814f7dd63SDavid Woodhouse 194914f7dd63SDavid Woodhouse if (cdp->err != nfs_ok) 19502f9092e1SDavid Woodhouse break; 195114f7dd63SDavid Woodhouse 195214f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(*de) + de->namlen, 195314f7dd63SDavid Woodhouse sizeof(u64)); 195414f7dd63SDavid Woodhouse size -= reclen; 195514f7dd63SDavid Woodhouse de = (struct buffered_dirent *)((char *)de + reclen); 195614f7dd63SDavid Woodhouse } 19572f9092e1SDavid Woodhouse mutex_unlock(&dir_inode->i_mutex); 19582f9092e1SDavid Woodhouse if (size > 0) /* We bailed out early */ 19592f9092e1SDavid Woodhouse break; 19602f9092e1SDavid Woodhouse 1961c002a6c7SDavid Woodhouse offset = vfs_llseek(file, 0, SEEK_CUR); 196214f7dd63SDavid Woodhouse } 196314f7dd63SDavid Woodhouse 196414f7dd63SDavid Woodhouse free_page((unsigned long)(buf.dirent)); 19652628b766SDavid Woodhouse 19662628b766SDavid Woodhouse if (host_err) 19672628b766SDavid Woodhouse return nfserrno(host_err); 196814f7dd63SDavid Woodhouse 196914f7dd63SDavid Woodhouse *offsetp = offset; 19702628b766SDavid Woodhouse return cdp->err; 19712628b766SDavid Woodhouse } 19722628b766SDavid Woodhouse 19731da177e4SLinus Torvalds /* 19741da177e4SLinus Torvalds * Read entries from a directory. 19751da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 19761da177e4SLinus Torvalds */ 19776264d69dSAl Viro __be32 19781da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 1979a0ad13efSNeilBrown struct readdir_cd *cdp, filldir_t func) 19801da177e4SLinus Torvalds { 19816264d69dSAl Viro __be32 err; 19821da177e4SLinus Torvalds struct file *file; 19831da177e4SLinus Torvalds loff_t offset = *offsetp; 19841da177e4SLinus Torvalds 19858837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file); 19861da177e4SLinus Torvalds if (err) 19871da177e4SLinus Torvalds goto out; 19881da177e4SLinus Torvalds 19891da177e4SLinus Torvalds offset = vfs_llseek(file, offset, 0); 19901da177e4SLinus Torvalds if (offset < 0) { 19911da177e4SLinus Torvalds err = nfserrno((int)offset); 19921da177e4SLinus Torvalds goto out_close; 19931da177e4SLinus Torvalds } 19941da177e4SLinus Torvalds 199514f7dd63SDavid Woodhouse err = nfsd_buffered_readdir(file, func, cdp, offsetp); 19961da177e4SLinus Torvalds 19971da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 19981da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 19991da177e4SLinus Torvalds out_close: 20001da177e4SLinus Torvalds nfsd_close(file); 20011da177e4SLinus Torvalds out: 20021da177e4SLinus Torvalds return err; 20031da177e4SLinus Torvalds } 20041da177e4SLinus Torvalds 20051da177e4SLinus Torvalds /* 20061da177e4SLinus Torvalds * Get file system stats 20071da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 20081da177e4SLinus Torvalds */ 20096264d69dSAl Viro __be32 201004716e66SJ. Bruce Fields nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) 20111da177e4SLinus Torvalds { 201204716e66SJ. Bruce Fields __be32 err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); 2013726c3342SDavid Howells if (!err && vfs_statfs(fhp->fh_dentry,stat)) 20141da177e4SLinus Torvalds err = nfserr_io; 20151da177e4SLinus Torvalds return err; 20161da177e4SLinus Torvalds } 20171da177e4SLinus Torvalds 2018c7d51402SJ. Bruce Fields static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) 2019e22841c6SJ. Bruce Fields { 2020c7d51402SJ. Bruce Fields return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; 2021e22841c6SJ. Bruce Fields } 2022e22841c6SJ. Bruce Fields 20231da177e4SLinus Torvalds /* 20241da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 20251da177e4SLinus Torvalds */ 20266264d69dSAl Viro __be32 20270ec757dfSJ. Bruce Fields nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, 20280ec757dfSJ. Bruce Fields struct dentry *dentry, int acc) 20291da177e4SLinus Torvalds { 20301da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 203114dba533SMimi Zohar struct path path; 20321da177e4SLinus Torvalds int err; 20331da177e4SLinus Torvalds 20348837abcaSMiklos Szeredi if (acc == NFSD_MAY_NOP) 20351da177e4SLinus Torvalds return 0; 20361da177e4SLinus Torvalds #if 0 20371da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 20381da177e4SLinus Torvalds acc, 20398837abcaSMiklos Szeredi (acc & NFSD_MAY_READ)? " read" : "", 20408837abcaSMiklos Szeredi (acc & NFSD_MAY_WRITE)? " write" : "", 20418837abcaSMiklos Szeredi (acc & NFSD_MAY_EXEC)? " exec" : "", 20428837abcaSMiklos Szeredi (acc & NFSD_MAY_SATTR)? " sattr" : "", 20438837abcaSMiklos Szeredi (acc & NFSD_MAY_TRUNC)? " trunc" : "", 20448837abcaSMiklos Szeredi (acc & NFSD_MAY_LOCK)? " lock" : "", 20458837abcaSMiklos Szeredi (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", 20461da177e4SLinus Torvalds inode->i_mode, 20471da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 20481da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 20492c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); 20501da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 20515cc0a840SDavid Howells inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); 20521da177e4SLinus Torvalds #endif 20531da177e4SLinus Torvalds 20541da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 20551da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 20561da177e4SLinus Torvalds * device special file, we ignore rofs. 20571da177e4SLinus Torvalds */ 20588837abcaSMiklos Szeredi if (!(acc & NFSD_MAY_LOCAL_ACCESS)) 20598837abcaSMiklos Szeredi if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { 20602c463e95SDave Hansen if (exp_rdonly(rqstp, exp) || 20612c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)) 20621da177e4SLinus Torvalds return nfserr_rofs; 20638837abcaSMiklos Szeredi if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) 20641da177e4SLinus Torvalds return nfserr_perm; 20651da177e4SLinus Torvalds } 20668837abcaSMiklos Szeredi if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) 20671da177e4SLinus Torvalds return nfserr_perm; 20681da177e4SLinus Torvalds 20698837abcaSMiklos Szeredi if (acc & NFSD_MAY_LOCK) { 20701da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 20711da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 20721da177e4SLinus Torvalds * ownership 20731da177e4SLinus Torvalds */ 20741da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 20751da177e4SLinus Torvalds return 0; 20761da177e4SLinus Torvalds else 20778837abcaSMiklos Szeredi acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; 20781da177e4SLinus Torvalds } 20791da177e4SLinus Torvalds /* 20801da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 20811da177e4SLinus Torvalds * would normally be checked at open time. This is to make 20821da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 20831da177e4SLinus Torvalds * 20841da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 20851da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 20861da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 20871da177e4SLinus Torvalds * always implies file truncation. 20881da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 20891da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 20901da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 20911da177e4SLinus Torvalds * with NFSv3. 20921da177e4SLinus Torvalds */ 20938837abcaSMiklos Szeredi if ((acc & NFSD_MAY_OWNER_OVERRIDE) && 20945cc0a840SDavid Howells inode->i_uid == current_fsuid()) 20951da177e4SLinus Torvalds return 0; 20961da177e4SLinus Torvalds 20978837abcaSMiklos Szeredi /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ 2098f419a2e3SAl Viro err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); 20991da177e4SLinus Torvalds 21001da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 21011da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 21028837abcaSMiklos Szeredi acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE)) 2103f419a2e3SAl Viro err = inode_permission(inode, MAY_EXEC); 210414dba533SMimi Zohar if (err) 210514dba533SMimi Zohar goto nfsd_out; 21061da177e4SLinus Torvalds 210714dba533SMimi Zohar /* Do integrity (permission) checking now, but defer incrementing 210814dba533SMimi Zohar * IMA counts to the actual file open. 210914dba533SMimi Zohar */ 211014dba533SMimi Zohar path.mnt = exp->ex_path.mnt; 211114dba533SMimi Zohar path.dentry = dentry; 211214dba533SMimi Zohar err = ima_path_check(&path, acc & (MAY_READ | MAY_WRITE | MAY_EXEC), 211314dba533SMimi Zohar IMA_COUNT_LEAVE); 211414dba533SMimi Zohar nfsd_out: 21151da177e4SLinus Torvalds return err? nfserrno(err) : 0; 21161da177e4SLinus Torvalds } 21171da177e4SLinus Torvalds 21181da177e4SLinus Torvalds void 21191da177e4SLinus Torvalds nfsd_racache_shutdown(void) 21201da177e4SLinus Torvalds { 212154a66e54SJeff Layton struct raparms *raparm, *last_raparm; 212254a66e54SJeff Layton unsigned int i; 212354a66e54SJeff Layton 21241da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 212554a66e54SJeff Layton 212654a66e54SJeff Layton for (i = 0; i < RAPARM_HASH_SIZE; i++) { 212754a66e54SJeff Layton raparm = raparm_hash[i].pb_head; 212854a66e54SJeff Layton while(raparm) { 212954a66e54SJeff Layton last_raparm = raparm; 213054a66e54SJeff Layton raparm = raparm->p_next; 213154a66e54SJeff Layton kfree(last_raparm); 213254a66e54SJeff Layton } 213354a66e54SJeff Layton raparm_hash[i].pb_head = NULL; 213454a66e54SJeff Layton } 21351da177e4SLinus Torvalds } 21361da177e4SLinus Torvalds /* 21371da177e4SLinus Torvalds * Initialize readahead param cache 21381da177e4SLinus Torvalds */ 21391da177e4SLinus Torvalds int 21401da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 21411da177e4SLinus Torvalds { 21421da177e4SLinus Torvalds int i; 2143fce1456aSGreg Banks int j = 0; 2144fce1456aSGreg Banks int nperbucket; 214554a66e54SJeff Layton struct raparms **raparm = NULL; 21461da177e4SLinus Torvalds 2147fce1456aSGreg Banks 214854a66e54SJeff Layton if (raparm_hash[0].pb_head) 21491da177e4SLinus Torvalds return 0; 215054a66e54SJeff Layton nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); 215154a66e54SJeff Layton if (nperbucket < 2) 215254a66e54SJeff Layton nperbucket = 2; 215354a66e54SJeff Layton cache_size = nperbucket * RAPARM_HASH_SIZE; 21544b3bb06bSYan Burman 21554b3bb06bSYan Burman dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); 215654a66e54SJeff Layton 2157fce1456aSGreg Banks for (i = 0; i < RAPARM_HASH_SIZE; i++) { 2158fce1456aSGreg Banks spin_lock_init(&raparm_hash[i].pb_lock); 215954a66e54SJeff Layton 216054a66e54SJeff Layton raparm = &raparm_hash[i].pb_head; 216154a66e54SJeff Layton for (j = 0; j < nperbucket; j++) { 216254a66e54SJeff Layton *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); 216354a66e54SJeff Layton if (!*raparm) 216454a66e54SJeff Layton goto out_nomem; 216554a66e54SJeff Layton raparm = &(*raparm)->p_next; 2166fce1456aSGreg Banks } 216754a66e54SJeff Layton *raparm = NULL; 21681da177e4SLinus Torvalds } 21694b3bb06bSYan Burman 21701da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 21711da177e4SLinus Torvalds return 0; 217254a66e54SJeff Layton 217354a66e54SJeff Layton out_nomem: 217454a66e54SJeff Layton dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); 217554a66e54SJeff Layton nfsd_racache_shutdown(); 217654a66e54SJeff Layton return -ENOMEM; 21771da177e4SLinus Torvalds } 2178a257cdd0SAndreas Gruenbacher 2179a257cdd0SAndreas Gruenbacher #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 2180a257cdd0SAndreas Gruenbacher struct posix_acl * 2181a257cdd0SAndreas Gruenbacher nfsd_get_posix_acl(struct svc_fh *fhp, int type) 2182a257cdd0SAndreas Gruenbacher { 2183a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2184a257cdd0SAndreas Gruenbacher char *name; 2185a257cdd0SAndreas Gruenbacher void *value = NULL; 2186a257cdd0SAndreas Gruenbacher ssize_t size; 2187a257cdd0SAndreas Gruenbacher struct posix_acl *acl; 2188a257cdd0SAndreas Gruenbacher 21895be196e5SChristoph Hellwig if (!IS_POSIXACL(inode)) 2190a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 21915be196e5SChristoph Hellwig 2192a257cdd0SAndreas Gruenbacher switch (type) { 2193a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2194334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2195a257cdd0SAndreas Gruenbacher break; 2196a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2197334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2198a257cdd0SAndreas Gruenbacher break; 2199a257cdd0SAndreas Gruenbacher default: 2200a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 2201a257cdd0SAndreas Gruenbacher } 2202a257cdd0SAndreas Gruenbacher 22035be196e5SChristoph Hellwig size = nfsd_getxattr(fhp->fh_dentry, name, &value); 22045be196e5SChristoph Hellwig if (size < 0) 22055be196e5SChristoph Hellwig return ERR_PTR(size); 2206a257cdd0SAndreas Gruenbacher 2207a257cdd0SAndreas Gruenbacher acl = posix_acl_from_xattr(value, size); 2208a257cdd0SAndreas Gruenbacher kfree(value); 2209a257cdd0SAndreas Gruenbacher return acl; 2210a257cdd0SAndreas Gruenbacher } 2211a257cdd0SAndreas Gruenbacher 2212a257cdd0SAndreas Gruenbacher int 2213a257cdd0SAndreas Gruenbacher nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) 2214a257cdd0SAndreas Gruenbacher { 2215a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2216a257cdd0SAndreas Gruenbacher char *name; 2217a257cdd0SAndreas Gruenbacher void *value = NULL; 2218a257cdd0SAndreas Gruenbacher size_t size; 2219a257cdd0SAndreas Gruenbacher int error; 2220a257cdd0SAndreas Gruenbacher 2221acfa4380SAl Viro if (!IS_POSIXACL(inode) || 2222a257cdd0SAndreas Gruenbacher !inode->i_op->setxattr || !inode->i_op->removexattr) 2223a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2224a257cdd0SAndreas Gruenbacher switch(type) { 2225a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2226334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2227a257cdd0SAndreas Gruenbacher break; 2228a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2229334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2230a257cdd0SAndreas Gruenbacher break; 2231a257cdd0SAndreas Gruenbacher default: 2232a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2233a257cdd0SAndreas Gruenbacher } 2234a257cdd0SAndreas Gruenbacher 2235a257cdd0SAndreas Gruenbacher if (acl && acl->a_count) { 2236334a13ecSChristoph Hellwig size = posix_acl_xattr_size(acl->a_count); 2237a257cdd0SAndreas Gruenbacher value = kmalloc(size, GFP_KERNEL); 2238a257cdd0SAndreas Gruenbacher if (!value) 2239a257cdd0SAndreas Gruenbacher return -ENOMEM; 22409ccfc29cSFlorin Malita error = posix_acl_to_xattr(acl, value, size); 22419ccfc29cSFlorin Malita if (error < 0) 2242a257cdd0SAndreas Gruenbacher goto getout; 22439ccfc29cSFlorin Malita size = error; 2244a257cdd0SAndreas Gruenbacher } else 2245a257cdd0SAndreas Gruenbacher size = 0; 2246a257cdd0SAndreas Gruenbacher 224718f335afSDave Hansen error = mnt_want_write(fhp->fh_export->ex_path.mnt); 224818f335afSDave Hansen if (error) 224918f335afSDave Hansen goto getout; 2250a257cdd0SAndreas Gruenbacher if (size) 22515be196e5SChristoph Hellwig error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); 2252a257cdd0SAndreas Gruenbacher else { 2253a257cdd0SAndreas Gruenbacher if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) 2254a257cdd0SAndreas Gruenbacher error = 0; 2255a257cdd0SAndreas Gruenbacher else { 22565be196e5SChristoph Hellwig error = vfs_removexattr(fhp->fh_dentry, name); 2257a257cdd0SAndreas Gruenbacher if (error == -ENODATA) 2258a257cdd0SAndreas Gruenbacher error = 0; 2259a257cdd0SAndreas Gruenbacher } 2260a257cdd0SAndreas Gruenbacher } 226118f335afSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 2262a257cdd0SAndreas Gruenbacher 2263a257cdd0SAndreas Gruenbacher getout: 2264a257cdd0SAndreas Gruenbacher kfree(value); 2265a257cdd0SAndreas Gruenbacher return error; 2266a257cdd0SAndreas Gruenbacher } 2267a257cdd0SAndreas Gruenbacher #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ 2268