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> 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds #include <asm/uaccess.h> 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds #define NFSDDBG_FACILITY NFSDDBG_FILEOP 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds /* 651da177e4SLinus Torvalds * This is a cache of readahead params that help us choose the proper 661da177e4SLinus Torvalds * readahead strategy. Initially, we set all readahead parameters to 0 671da177e4SLinus Torvalds * and let the VFS handle things. 681da177e4SLinus Torvalds * If you increase the number of cached files very much, you'll need to 691da177e4SLinus Torvalds * add a hash table here. 701da177e4SLinus Torvalds */ 711da177e4SLinus Torvalds struct raparms { 721da177e4SLinus Torvalds struct raparms *p_next; 731da177e4SLinus Torvalds unsigned int p_count; 741da177e4SLinus Torvalds ino_t p_ino; 751da177e4SLinus Torvalds dev_t p_dev; 761da177e4SLinus Torvalds int p_set; 771da177e4SLinus Torvalds struct file_ra_state p_ra; 78fce1456aSGreg Banks unsigned int p_hindex; 791da177e4SLinus Torvalds }; 801da177e4SLinus Torvalds 81fce1456aSGreg Banks struct raparm_hbucket { 82fce1456aSGreg Banks struct raparms *pb_head; 83fce1456aSGreg Banks spinlock_t pb_lock; 84fce1456aSGreg Banks } ____cacheline_aligned_in_smp; 85fce1456aSGreg Banks 86fce1456aSGreg Banks #define RAPARM_HASH_BITS 4 87fce1456aSGreg Banks #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) 88fce1456aSGreg Banks #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) 89fce1456aSGreg Banks static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds /* 921da177e4SLinus Torvalds * Called from nfsd_lookup and encode_dirent. Check if we have crossed 931da177e4SLinus Torvalds * a mount point. 94e0bb89efSJ.Bruce Fields * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, 951da177e4SLinus Torvalds * or nfs_ok having possibly changed *dpp and *expp 961da177e4SLinus Torvalds */ 971da177e4SLinus Torvalds int 981da177e4SLinus Torvalds nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 991da177e4SLinus Torvalds struct svc_export **expp) 1001da177e4SLinus Torvalds { 1011da177e4SLinus Torvalds struct svc_export *exp = *expp, *exp2 = NULL; 1021da177e4SLinus Torvalds struct dentry *dentry = *dpp; 10354775491SJan Blunck struct vfsmount *mnt = mntget(exp->ex_path.mnt); 1041da177e4SLinus Torvalds struct dentry *mounts = dget(dentry); 1056264d69dSAl Viro int err = 0; 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts)); 1081da177e4SLinus Torvalds 1090989a788SJ. Bruce Fields exp2 = rqst_exp_get_by_name(rqstp, mnt, mounts); 1101da177e4SLinus Torvalds if (IS_ERR(exp2)) { 111a1033be7SNeil Brown if (PTR_ERR(exp2) != -ENOENT) 1121da177e4SLinus Torvalds err = PTR_ERR(exp2); 1131da177e4SLinus Torvalds dput(mounts); 1141da177e4SLinus Torvalds mntput(mnt); 1151da177e4SLinus Torvalds goto out; 1161da177e4SLinus Torvalds } 1175d3dbbeaSJ. Bruce Fields if ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { 1181da177e4SLinus Torvalds /* successfully crossed mount point */ 1191da177e4SLinus Torvalds exp_put(exp); 1201da177e4SLinus Torvalds *expp = exp2; 1211da177e4SLinus Torvalds dput(dentry); 1221da177e4SLinus Torvalds *dpp = mounts; 1231da177e4SLinus Torvalds } else { 1245d3dbbeaSJ. Bruce Fields exp_put(exp2); 1251da177e4SLinus Torvalds dput(mounts); 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds mntput(mnt); 1281da177e4SLinus Torvalds out: 1291da177e4SLinus Torvalds return err; 1301da177e4SLinus Torvalds } 1311da177e4SLinus Torvalds 1326264d69dSAl Viro __be32 1336c0a654dSJ. Bruce Fields nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, 1345a022fc8SChuck Lever const char *name, unsigned int len, 1356c0a654dSJ. Bruce Fields struct svc_export **exp_ret, struct dentry **dentry_ret) 1361da177e4SLinus Torvalds { 1371da177e4SLinus Torvalds struct svc_export *exp; 1381da177e4SLinus Torvalds struct dentry *dparent; 1391da177e4SLinus Torvalds struct dentry *dentry; 1406264d69dSAl Viro __be32 err; 1416264d69dSAl Viro int host_err; 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds /* Obtain dentry and export. */ 1468837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 1471da177e4SLinus Torvalds if (err) 1481da177e4SLinus Torvalds return err; 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds dparent = fhp->fh_dentry; 1511da177e4SLinus Torvalds exp = fhp->fh_export; 1521da177e4SLinus Torvalds exp_get(exp); 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds /* Lookup the name, but don't follow links */ 1551da177e4SLinus Torvalds if (isdotent(name, len)) { 1561da177e4SLinus Torvalds if (len==1) 1571da177e4SLinus Torvalds dentry = dget(dparent); 15854775491SJan Blunck else if (dparent != exp->ex_path.dentry) 1591da177e4SLinus Torvalds dentry = dget_parent(dparent); 16054775491SJan Blunck else if (!EX_NOHIDE(exp)) 1611da177e4SLinus Torvalds dentry = dget(dparent); /* .. == . just like at / */ 1621da177e4SLinus Torvalds else { 1631da177e4SLinus Torvalds /* checking mountpoint crossing is very different when stepping up */ 1641da177e4SLinus Torvalds struct svc_export *exp2 = NULL; 1651da177e4SLinus Torvalds struct dentry *dp; 16654775491SJan Blunck struct vfsmount *mnt = mntget(exp->ex_path.mnt); 1671da177e4SLinus Torvalds dentry = dget(dparent); 1681da177e4SLinus Torvalds while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry)) 1691da177e4SLinus Torvalds ; 1701da177e4SLinus Torvalds dp = dget_parent(dentry); 1711da177e4SLinus Torvalds dput(dentry); 1721da177e4SLinus Torvalds dentry = dp; 1731da177e4SLinus Torvalds 1740989a788SJ. Bruce Fields exp2 = rqst_exp_parent(rqstp, mnt, dentry); 1752d3bb252SJ. Bruce Fields if (PTR_ERR(exp2) == -ENOENT) { 1762d3bb252SJ. Bruce Fields dput(dentry); 1772d3bb252SJ. Bruce Fields dentry = dget(dparent); 1782d3bb252SJ. Bruce Fields } else if (IS_ERR(exp2)) { 1796264d69dSAl Viro host_err = PTR_ERR(exp2); 1801da177e4SLinus Torvalds dput(dentry); 1811da177e4SLinus Torvalds mntput(mnt); 1821da177e4SLinus Torvalds goto out_nfserr; 1831da177e4SLinus Torvalds } else { 1841da177e4SLinus Torvalds exp_put(exp); 1851da177e4SLinus Torvalds exp = exp2; 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds mntput(mnt); 1881da177e4SLinus Torvalds } 1891da177e4SLinus Torvalds } else { 1901da177e4SLinus Torvalds fh_lock(fhp); 1911da177e4SLinus Torvalds dentry = lookup_one_len(name, dparent, len); 1926264d69dSAl Viro host_err = PTR_ERR(dentry); 1931da177e4SLinus Torvalds if (IS_ERR(dentry)) 1941da177e4SLinus Torvalds goto out_nfserr; 1951da177e4SLinus Torvalds /* 1961da177e4SLinus Torvalds * check if we have crossed a mount point ... 1971da177e4SLinus Torvalds */ 1981da177e4SLinus Torvalds if (d_mountpoint(dentry)) { 1996264d69dSAl Viro if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 2001da177e4SLinus Torvalds dput(dentry); 2011da177e4SLinus Torvalds goto out_nfserr; 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds } 2056c0a654dSJ. Bruce Fields *dentry_ret = dentry; 2066c0a654dSJ. Bruce Fields *exp_ret = exp; 2076c0a654dSJ. Bruce Fields return 0; 2086c0a654dSJ. Bruce Fields 2096c0a654dSJ. Bruce Fields out_nfserr: 2106c0a654dSJ. Bruce Fields exp_put(exp); 2116c0a654dSJ. Bruce Fields return nfserrno(host_err); 2126c0a654dSJ. Bruce Fields } 2136c0a654dSJ. Bruce Fields 2146c0a654dSJ. Bruce Fields /* 2156c0a654dSJ. Bruce Fields * Look up one component of a pathname. 2166c0a654dSJ. Bruce Fields * N.B. After this call _both_ fhp and resfh need an fh_put 2176c0a654dSJ. Bruce Fields * 2186c0a654dSJ. Bruce Fields * If the lookup would cross a mountpoint, and the mounted filesystem 2196c0a654dSJ. Bruce Fields * is exported to the client with NFSEXP_NOHIDE, then the lookup is 2206c0a654dSJ. Bruce Fields * accepted as it stands and the mounted directory is 2216c0a654dSJ. Bruce Fields * returned. Otherwise the covered directory is returned. 2226c0a654dSJ. Bruce Fields * NOTE: this mountpoint crossing is not supported properly by all 2236c0a654dSJ. Bruce Fields * clients and is explicitly disallowed for NFSv3 2246c0a654dSJ. Bruce Fields * NeilBrown <neilb@cse.unsw.edu.au> 2256c0a654dSJ. Bruce Fields */ 2266c0a654dSJ. Bruce Fields __be32 2276c0a654dSJ. Bruce Fields nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 2285a022fc8SChuck Lever unsigned int len, struct svc_fh *resfh) 2296c0a654dSJ. Bruce Fields { 2306c0a654dSJ. Bruce Fields struct svc_export *exp; 2316c0a654dSJ. Bruce Fields struct dentry *dentry; 2326c0a654dSJ. Bruce Fields __be32 err; 2336c0a654dSJ. Bruce Fields 2346c0a654dSJ. Bruce Fields err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); 2356c0a654dSJ. Bruce Fields if (err) 2366c0a654dSJ. Bruce Fields return err; 23732c1eb0cSAndy Adamson err = check_nfsd_access(exp, rqstp); 23832c1eb0cSAndy Adamson if (err) 23932c1eb0cSAndy Adamson goto out; 2401da177e4SLinus Torvalds /* 2411da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2421da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2431da177e4SLinus Torvalds */ 2441da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2451da177e4SLinus Torvalds if (!err && !dentry->d_inode) 2461da177e4SLinus Torvalds err = nfserr_noent; 24732c1eb0cSAndy Adamson out: 2481da177e4SLinus Torvalds dput(dentry); 2491da177e4SLinus Torvalds exp_put(exp); 2501da177e4SLinus Torvalds return err; 2511da177e4SLinus Torvalds } 2521da177e4SLinus Torvalds 2536c0a654dSJ. Bruce Fields 2541da177e4SLinus Torvalds /* 2551da177e4SLinus Torvalds * Set various file attributes. 2561da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 2571da177e4SLinus Torvalds */ 2586264d69dSAl Viro __be32 2591da177e4SLinus Torvalds nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 2601da177e4SLinus Torvalds int check_guard, time_t guardtime) 2611da177e4SLinus Torvalds { 2621da177e4SLinus Torvalds struct dentry *dentry; 2631da177e4SLinus Torvalds struct inode *inode; 2648837abcaSMiklos Szeredi int accmode = NFSD_MAY_SATTR; 2651da177e4SLinus Torvalds int ftype = 0; 2666264d69dSAl Viro __be32 err; 2676264d69dSAl Viro int host_err; 2681da177e4SLinus Torvalds int size_change = 0; 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) 2718837abcaSMiklos Szeredi accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; 2721da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) 2731da177e4SLinus Torvalds ftype = S_IFREG; 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds /* Get inode */ 2761da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 27715b7a1b8SNeilBrown if (err) 2781da177e4SLinus Torvalds goto out; 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds dentry = fhp->fh_dentry; 2811da177e4SLinus Torvalds inode = dentry->d_inode; 2821da177e4SLinus Torvalds 28315b7a1b8SNeilBrown /* Ignore any mode updates on symlinks */ 28415b7a1b8SNeilBrown if (S_ISLNK(inode->i_mode)) 28515b7a1b8SNeilBrown iap->ia_valid &= ~ATTR_MODE; 28615b7a1b8SNeilBrown 28715b7a1b8SNeilBrown if (!iap->ia_valid) 28815b7a1b8SNeilBrown goto out; 28915b7a1b8SNeilBrown 2909c85fca5SChristoph Hellwig /* 2919c85fca5SChristoph Hellwig * NFSv2 does not differentiate between "set-[ac]time-to-now" 2921da177e4SLinus Torvalds * which only requires access, and "set-[ac]time-to-X" which 2931da177e4SLinus Torvalds * requires ownership. 2941da177e4SLinus Torvalds * So if it looks like it might be "set both to the same time which 2951da177e4SLinus Torvalds * is close to now", and if inode_change_ok fails, then we 2961da177e4SLinus Torvalds * convert to "set to now" instead of "set to explicit time" 2971da177e4SLinus Torvalds * 2981da177e4SLinus Torvalds * We only call inode_change_ok as the last test as technically 2991da177e4SLinus Torvalds * it is not an interface that we should be using. It is only 3001da177e4SLinus Torvalds * valid if the filesystem does not define it's own i_op->setattr. 3011da177e4SLinus Torvalds */ 3021da177e4SLinus Torvalds #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) 3031da177e4SLinus Torvalds #define MAX_TOUCH_TIME_ERROR (30*60) 3049c85fca5SChristoph Hellwig if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && 3059c85fca5SChristoph Hellwig iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { 3069c85fca5SChristoph Hellwig /* 3079c85fca5SChristoph Hellwig * Looks probable. 3089c85fca5SChristoph Hellwig * 3099c85fca5SChristoph Hellwig * Now just make sure time is in the right ballpark. 3109c85fca5SChristoph Hellwig * Solaris, at least, doesn't seem to care what the time 3119c85fca5SChristoph Hellwig * request is. We require it be within 30 minutes of now. 3121da177e4SLinus Torvalds */ 3131da177e4SLinus Torvalds time_t delta = iap->ia_atime.tv_sec - get_seconds(); 3149c85fca5SChristoph Hellwig if (delta < 0) 3159c85fca5SChristoph Hellwig delta = -delta; 3161da177e4SLinus Torvalds if (delta < MAX_TOUCH_TIME_ERROR && 3171da177e4SLinus Torvalds inode_change_ok(inode, iap) != 0) { 3189c85fca5SChristoph Hellwig /* 3199c85fca5SChristoph Hellwig * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. 3209c85fca5SChristoph Hellwig * This will cause notify_change to set these times 3219c85fca5SChristoph Hellwig * to "now" 3221da177e4SLinus Torvalds */ 3231da177e4SLinus Torvalds iap->ia_valid &= ~BOTH_TIME_SET; 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds } 3261da177e4SLinus Torvalds 3279c85fca5SChristoph Hellwig /* 3289c85fca5SChristoph Hellwig * The size case is special. 3299c85fca5SChristoph Hellwig * It changes the file as well as the attributes. 3309c85fca5SChristoph Hellwig */ 3311da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) { 3321da177e4SLinus Torvalds if (iap->ia_size < inode->i_size) { 3338837abcaSMiklos Szeredi err = nfsd_permission(rqstp, fhp->fh_export, dentry, 3348837abcaSMiklos Szeredi NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE); 3351da177e4SLinus Torvalds if (err) 3361da177e4SLinus Torvalds goto out; 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds /* 3401da177e4SLinus Torvalds * If we are changing the size of the file, then 3411da177e4SLinus Torvalds * we need to break all leases. 3421da177e4SLinus Torvalds */ 3436264d69dSAl Viro host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK); 3446264d69dSAl Viro if (host_err == -EWOULDBLOCK) 3456264d69dSAl Viro host_err = -ETIMEDOUT; 3466264d69dSAl Viro if (host_err) /* ENOMEM or EWOULDBLOCK */ 3471da177e4SLinus Torvalds goto out_nfserr; 3481da177e4SLinus Torvalds 3496264d69dSAl Viro host_err = get_write_access(inode); 3506264d69dSAl Viro if (host_err) 3511da177e4SLinus Torvalds goto out_nfserr; 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds size_change = 1; 3546264d69dSAl Viro host_err = locks_verify_truncate(inode, NULL, iap->ia_size); 3556264d69dSAl Viro if (host_err) { 3561da177e4SLinus Torvalds put_write_access(inode); 3571da177e4SLinus Torvalds goto out_nfserr; 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds DQUOT_INIT(inode); 3601da177e4SLinus Torvalds } 3611da177e4SLinus Torvalds 362ca456252SJeff Layton /* sanitize the mode change */ 3631da177e4SLinus Torvalds if (iap->ia_valid & ATTR_MODE) { 3641da177e4SLinus Torvalds iap->ia_mode &= S_IALLUGO; 365dee3209dSJeff Layton iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); 3661da177e4SLinus Torvalds } 367ca456252SJeff Layton 368ca456252SJeff Layton /* Revoke setuid/setgid on chown */ 369ca456252SJeff Layton if (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) || 370ca456252SJeff Layton ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)) { 371ca456252SJeff Layton iap->ia_valid |= ATTR_KILL_PRIV; 372ca456252SJeff Layton if (iap->ia_valid & ATTR_MODE) { 373ca456252SJeff Layton /* we're setting mode too, just clear the s*id bits */ 374ca456252SJeff Layton iap->ia_mode &= ~S_ISUID; 375ca456252SJeff Layton if (iap->ia_mode & S_IXGRP) 3768a0ce7d9SJeff Layton iap->ia_mode &= ~S_ISGID; 3778a0ce7d9SJeff Layton } else { 378ca456252SJeff Layton /* set ATTR_KILL_* bits and let VFS handle it */ 379ca456252SJeff Layton iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); 380ca456252SJeff Layton } 3818a0ce7d9SJeff Layton } 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds /* Change the attributes. */ 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds err = nfserr_notsync; 3881da177e4SLinus Torvalds if (!check_guard || guardtime == inode->i_ctime.tv_sec) { 3891da177e4SLinus Torvalds fh_lock(fhp); 3906264d69dSAl Viro host_err = notify_change(dentry, iap); 3916264d69dSAl Viro err = nfserrno(host_err); 3921da177e4SLinus Torvalds fh_unlock(fhp); 3931da177e4SLinus Torvalds } 3941da177e4SLinus Torvalds if (size_change) 3951da177e4SLinus Torvalds put_write_access(inode); 3961da177e4SLinus Torvalds if (!err) 3971da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 3981da177e4SLinus Torvalds write_inode_now(inode, 1); 3991da177e4SLinus Torvalds out: 4001da177e4SLinus Torvalds return err; 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds out_nfserr: 4036264d69dSAl Viro err = nfserrno(host_err); 4041da177e4SLinus Torvalds goto out; 4051da177e4SLinus Torvalds } 4061da177e4SLinus Torvalds 4075be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V2_ACL) || \ 4085be196e5SChristoph Hellwig defined(CONFIG_NFSD_V3_ACL) || \ 4095be196e5SChristoph Hellwig defined(CONFIG_NFSD_V4) 4105be196e5SChristoph Hellwig static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) 4115be196e5SChristoph Hellwig { 4125be196e5SChristoph Hellwig ssize_t buflen; 4136c6a426fSKrishna Kumar ssize_t ret; 4141da177e4SLinus Torvalds 4155be196e5SChristoph Hellwig buflen = vfs_getxattr(dentry, key, NULL, 0); 4165be196e5SChristoph Hellwig if (buflen <= 0) 4175be196e5SChristoph Hellwig return buflen; 4185be196e5SChristoph Hellwig 4195be196e5SChristoph Hellwig *buf = kmalloc(buflen, GFP_KERNEL); 4205be196e5SChristoph Hellwig if (!*buf) 4215be196e5SChristoph Hellwig return -ENOMEM; 4225be196e5SChristoph Hellwig 4236c6a426fSKrishna Kumar ret = vfs_getxattr(dentry, key, *buf, buflen); 4246c6a426fSKrishna Kumar if (ret < 0) 4256c6a426fSKrishna Kumar kfree(*buf); 4266c6a426fSKrishna Kumar return ret; 4275be196e5SChristoph Hellwig } 4285be196e5SChristoph Hellwig #endif 4295be196e5SChristoph Hellwig 4305be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V4) 4311da177e4SLinus Torvalds static int 4321da177e4SLinus Torvalds set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) 4331da177e4SLinus Torvalds { 4341da177e4SLinus Torvalds int len; 4351da177e4SLinus Torvalds size_t buflen; 4361da177e4SLinus Torvalds char *buf = NULL; 4371da177e4SLinus Torvalds int error = 0; 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds buflen = posix_acl_xattr_size(pacl->a_count); 4401da177e4SLinus Torvalds buf = kmalloc(buflen, GFP_KERNEL); 4411da177e4SLinus Torvalds error = -ENOMEM; 4421da177e4SLinus Torvalds if (buf == NULL) 4431da177e4SLinus Torvalds goto out; 4441da177e4SLinus Torvalds 4451da177e4SLinus Torvalds len = posix_acl_to_xattr(pacl, buf, buflen); 4461da177e4SLinus Torvalds if (len < 0) { 4471da177e4SLinus Torvalds error = len; 4481da177e4SLinus Torvalds goto out; 4491da177e4SLinus Torvalds } 4501da177e4SLinus Torvalds 4515be196e5SChristoph Hellwig error = vfs_setxattr(dentry, key, buf, len, 0); 4521da177e4SLinus Torvalds out: 4531da177e4SLinus Torvalds kfree(buf); 4541da177e4SLinus Torvalds return error; 4551da177e4SLinus Torvalds } 4561da177e4SLinus Torvalds 4576264d69dSAl Viro __be32 4581da177e4SLinus Torvalds nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, 4591da177e4SLinus Torvalds struct nfs4_acl *acl) 4601da177e4SLinus Torvalds { 4616264d69dSAl Viro __be32 error; 4626264d69dSAl Viro int host_error; 4631da177e4SLinus Torvalds struct dentry *dentry; 4641da177e4SLinus Torvalds struct inode *inode; 4651da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 4661da177e4SLinus Torvalds unsigned int flags = 0; 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds /* Get inode */ 4698837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); 4701da177e4SLinus Torvalds if (error) 4714b2ca38aSJ. Bruce Fields return error; 4721da177e4SLinus Torvalds 4731da177e4SLinus Torvalds dentry = fhp->fh_dentry; 4741da177e4SLinus Torvalds inode = dentry->d_inode; 4751da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) 4761da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 4771da177e4SLinus Torvalds 4786264d69dSAl Viro host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); 4796264d69dSAl Viro if (host_error == -EINVAL) { 4804b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 4816264d69dSAl Viro } else if (host_error < 0) 4821da177e4SLinus Torvalds goto out_nfserr; 4831da177e4SLinus Torvalds 4846264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); 4856264d69dSAl Viro if (host_error < 0) 4864b2ca38aSJ. Bruce Fields goto out_release; 4871da177e4SLinus Torvalds 4884b2ca38aSJ. Bruce Fields if (S_ISDIR(inode->i_mode)) 4896264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); 4901da177e4SLinus Torvalds 4914b2ca38aSJ. Bruce Fields out_release: 4921da177e4SLinus Torvalds posix_acl_release(pacl); 4931da177e4SLinus Torvalds posix_acl_release(dpacl); 4941da177e4SLinus Torvalds out_nfserr: 495f34f9242SJ. Bruce Fields if (host_error == -EOPNOTSUPP) 4964b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 497f34f9242SJ. Bruce Fields else 4984b2ca38aSJ. Bruce Fields return nfserrno(host_error); 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds 5011da177e4SLinus Torvalds static struct posix_acl * 5021da177e4SLinus Torvalds _get_posix_acl(struct dentry *dentry, char *key) 5031da177e4SLinus Torvalds { 5045be196e5SChristoph Hellwig void *buf = NULL; 5051da177e4SLinus Torvalds struct posix_acl *pacl = NULL; 5065be196e5SChristoph Hellwig int buflen; 5071da177e4SLinus Torvalds 5085be196e5SChristoph Hellwig buflen = nfsd_getxattr(dentry, key, &buf); 5095be196e5SChristoph Hellwig if (!buflen) 5105be196e5SChristoph Hellwig buflen = -ENODATA; 5115be196e5SChristoph Hellwig if (buflen <= 0) 5125be196e5SChristoph Hellwig return ERR_PTR(buflen); 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds pacl = posix_acl_from_xattr(buf, buflen); 5151da177e4SLinus Torvalds kfree(buf); 5161da177e4SLinus Torvalds return pacl; 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds 5191da177e4SLinus Torvalds int 5201da177e4SLinus Torvalds nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) 5211da177e4SLinus Torvalds { 5221da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 5231da177e4SLinus Torvalds int error = 0; 5241da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 5251da177e4SLinus Torvalds unsigned int flags = 0; 5261da177e4SLinus Torvalds 5279a59f452SChristoph Hellwig pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); 5281da177e4SLinus Torvalds if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) 5291da177e4SLinus Torvalds pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 5301da177e4SLinus Torvalds if (IS_ERR(pacl)) { 5311da177e4SLinus Torvalds error = PTR_ERR(pacl); 5321da177e4SLinus Torvalds pacl = NULL; 5331da177e4SLinus Torvalds goto out; 5341da177e4SLinus Torvalds } 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) { 5379a59f452SChristoph Hellwig dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); 5381da177e4SLinus Torvalds if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) 5391da177e4SLinus Torvalds dpacl = NULL; 5401da177e4SLinus Torvalds else if (IS_ERR(dpacl)) { 5411da177e4SLinus Torvalds error = PTR_ERR(dpacl); 5421da177e4SLinus Torvalds dpacl = NULL; 5431da177e4SLinus Torvalds goto out; 5441da177e4SLinus Torvalds } 5451da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5461da177e4SLinus Torvalds } 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); 5491da177e4SLinus Torvalds if (IS_ERR(*acl)) { 5501da177e4SLinus Torvalds error = PTR_ERR(*acl); 5511da177e4SLinus Torvalds *acl = NULL; 5521da177e4SLinus Torvalds } 5531da177e4SLinus Torvalds out: 5541da177e4SLinus Torvalds posix_acl_release(pacl); 5551da177e4SLinus Torvalds posix_acl_release(dpacl); 5561da177e4SLinus Torvalds return error; 5571da177e4SLinus Torvalds } 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds #endif /* defined(CONFIG_NFS_V4) */ 5601da177e4SLinus Torvalds 5611da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 5621da177e4SLinus Torvalds /* 5631da177e4SLinus Torvalds * Check server access rights to a file system object 5641da177e4SLinus Torvalds */ 5651da177e4SLinus Torvalds struct accessmap { 5661da177e4SLinus Torvalds u32 access; 5671da177e4SLinus Torvalds int how; 5681da177e4SLinus Torvalds }; 5691da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 5708837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 5718837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 5728837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, 5738837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, 5741da177e4SLinus Torvalds 5751da177e4SLinus Torvalds { 0, 0 } 5761da177e4SLinus Torvalds }; 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 5798837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 5808837abcaSMiklos Szeredi { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, 5818837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, 5828837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, 5838837abcaSMiklos Szeredi { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds { 0, 0 } 5861da177e4SLinus Torvalds }; 5871da177e4SLinus Torvalds 5881da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 5891da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 5901da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 5911da177e4SLinus Torvalds * (which really, the server doesn't care about). So 5921da177e4SLinus Torvalds * We provide simple access checking for them, looking 5931da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 5941da177e4SLinus Torvalds * filesystem checks 5951da177e4SLinus Torvalds */ 5968837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 5978837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 5988837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 5998837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds { 0, 0 } 6021da177e4SLinus Torvalds }; 6031da177e4SLinus Torvalds 6046264d69dSAl Viro __be32 6051da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 6061da177e4SLinus Torvalds { 6071da177e4SLinus Torvalds struct accessmap *map; 6081da177e4SLinus Torvalds struct svc_export *export; 6091da177e4SLinus Torvalds struct dentry *dentry; 6101da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 6116264d69dSAl Viro __be32 error; 6121da177e4SLinus Torvalds 6138837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 6141da177e4SLinus Torvalds if (error) 6151da177e4SLinus Torvalds goto out; 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds export = fhp->fh_export; 6181da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds if (S_ISREG(dentry->d_inode->i_mode)) 6211da177e4SLinus Torvalds map = nfs3_regaccess; 6221da177e4SLinus Torvalds else if (S_ISDIR(dentry->d_inode->i_mode)) 6231da177e4SLinus Torvalds map = nfs3_diraccess; 6241da177e4SLinus Torvalds else 6251da177e4SLinus Torvalds map = nfs3_anyaccess; 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds query = *access; 6291da177e4SLinus Torvalds for (; map->access; map++) { 6301da177e4SLinus Torvalds if (map->access & query) { 6316264d69dSAl Viro __be32 err2; 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds sresult |= map->access; 6341da177e4SLinus Torvalds 6350ec757dfSJ. Bruce Fields err2 = nfsd_permission(rqstp, export, dentry, map->how); 6361da177e4SLinus Torvalds switch (err2) { 6371da177e4SLinus Torvalds case nfs_ok: 6381da177e4SLinus Torvalds result |= map->access; 6391da177e4SLinus Torvalds break; 6401da177e4SLinus Torvalds 6411da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 6421da177e4SLinus Torvalds * rather than an error occurred */ 6431da177e4SLinus Torvalds case nfserr_rofs: 6441da177e4SLinus Torvalds case nfserr_acces: 6451da177e4SLinus Torvalds case nfserr_perm: 6461da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 6471da177e4SLinus Torvalds break; 6481da177e4SLinus Torvalds default: 6491da177e4SLinus Torvalds error = err2; 6501da177e4SLinus Torvalds goto out; 6511da177e4SLinus Torvalds } 6521da177e4SLinus Torvalds } 6531da177e4SLinus Torvalds } 6541da177e4SLinus Torvalds *access = result; 6551da177e4SLinus Torvalds if (supported) 6561da177e4SLinus Torvalds *supported = sresult; 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds out: 6591da177e4SLinus Torvalds return error; 6601da177e4SLinus Torvalds } 6611da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds /* 6661da177e4SLinus Torvalds * Open an existing file or directory. 6671da177e4SLinus Torvalds * The access argument indicates the type of open (read/write/lock) 6681da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 6691da177e4SLinus Torvalds */ 6706264d69dSAl Viro __be32 6711da177e4SLinus Torvalds nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 6721da177e4SLinus Torvalds int access, struct file **filp) 6731da177e4SLinus Torvalds { 674*745ca247SDavid Howells const struct cred *cred = current_cred(); 6751da177e4SLinus Torvalds struct dentry *dentry; 6761da177e4SLinus Torvalds struct inode *inode; 6776264d69dSAl Viro int flags = O_RDONLY|O_LARGEFILE; 6786264d69dSAl Viro __be32 err; 6796264d69dSAl Viro int host_err; 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds /* 6821da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 6831da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 6841da177e4SLinus Torvalds * in case a chmod has now revoked permission. 6851da177e4SLinus Torvalds */ 6868837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE); 6871da177e4SLinus Torvalds if (err) 6881da177e4SLinus Torvalds goto out; 6891da177e4SLinus Torvalds 6901da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6911da177e4SLinus Torvalds inode = dentry->d_inode; 6921da177e4SLinus Torvalds 6931da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 6941da177e4SLinus Torvalds * or any access when mandatory locking enabled 6951da177e4SLinus Torvalds */ 6961da177e4SLinus Torvalds err = nfserr_perm; 6978837abcaSMiklos Szeredi if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE)) 6981da177e4SLinus Torvalds goto out; 6995e7fc436SJ. Bruce Fields /* 7005e7fc436SJ. Bruce Fields * We must ignore files (but only files) which might have mandatory 7015e7fc436SJ. Bruce Fields * locks on them because there is no way to know if the accesser has 7025e7fc436SJ. Bruce Fields * the lock. 7035e7fc436SJ. Bruce Fields */ 7045e7fc436SJ. Bruce Fields if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) 7051da177e4SLinus Torvalds goto out; 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds if (!inode->i_fop) 7081da177e4SLinus Torvalds goto out; 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds /* 7111da177e4SLinus Torvalds * Check to see if there are any leases on this file. 7121da177e4SLinus Torvalds * This may block while leases are broken. 7131da177e4SLinus Torvalds */ 7148837abcaSMiklos Szeredi host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? FMODE_WRITE : 0)); 7156264d69dSAl Viro if (host_err == -EWOULDBLOCK) 7166264d69dSAl Viro host_err = -ETIMEDOUT; 7176264d69dSAl Viro if (host_err) /* NOMEM or WOULDBLOCK */ 7181da177e4SLinus Torvalds goto out_nfserr; 7191da177e4SLinus Torvalds 7208837abcaSMiklos Szeredi if (access & NFSD_MAY_WRITE) { 7218837abcaSMiklos Szeredi if (access & NFSD_MAY_READ) 7229ecb6a08SJ. Bruce Fields flags = O_RDWR|O_LARGEFILE; 7239ecb6a08SJ. Bruce Fields else 7241da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds DQUOT_INIT(inode); 7271da177e4SLinus Torvalds } 72854775491SJan Blunck *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt), 729*745ca247SDavid Howells flags, cred); 7301da177e4SLinus Torvalds if (IS_ERR(*filp)) 7316264d69dSAl Viro host_err = PTR_ERR(*filp); 7321da177e4SLinus Torvalds out_nfserr: 7336264d69dSAl Viro err = nfserrno(host_err); 7341da177e4SLinus Torvalds out: 7351da177e4SLinus Torvalds return err; 7361da177e4SLinus Torvalds } 7371da177e4SLinus Torvalds 7381da177e4SLinus Torvalds /* 7391da177e4SLinus Torvalds * Close a file. 7401da177e4SLinus Torvalds */ 7411da177e4SLinus Torvalds void 7421da177e4SLinus Torvalds nfsd_close(struct file *filp) 7431da177e4SLinus Torvalds { 7441da177e4SLinus Torvalds fput(filp); 7451da177e4SLinus Torvalds } 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds /* 7481da177e4SLinus Torvalds * Sync a file 7491da177e4SLinus Torvalds * As this calls fsync (not fdatasync) there is no need for a write_inode 7501da177e4SLinus Torvalds * after it. 7511da177e4SLinus Torvalds */ 752a334de28SDavid Shaw static inline int nfsd_dosync(struct file *filp, struct dentry *dp, 75399ac48f5SArjan van de Ven const struct file_operations *fop) 7541da177e4SLinus Torvalds { 7551da177e4SLinus Torvalds struct inode *inode = dp->d_inode; 7561da177e4SLinus Torvalds int (*fsync) (struct file *, struct dentry *, int); 757f193fbabSYAMAMOTO Takashi int err; 7581da177e4SLinus Torvalds 759f193fbabSYAMAMOTO Takashi err = filemap_fdatawrite(inode->i_mapping); 760f193fbabSYAMAMOTO Takashi if (err == 0 && fop && (fsync = fop->fsync)) 761a334de28SDavid Shaw err = fsync(filp, dp, 0); 762f193fbabSYAMAMOTO Takashi if (err == 0) 763f193fbabSYAMAMOTO Takashi err = filemap_fdatawait(inode->i_mapping); 764a334de28SDavid Shaw 765f193fbabSYAMAMOTO Takashi return err; 7661da177e4SLinus Torvalds } 7671da177e4SLinus Torvalds 7681da177e4SLinus Torvalds 769a334de28SDavid Shaw static int 7701da177e4SLinus Torvalds nfsd_sync(struct file *filp) 7711da177e4SLinus Torvalds { 772a334de28SDavid Shaw int err; 7737eaa36e2SJosef "Jeff" Sipek struct inode *inode = filp->f_path.dentry->d_inode; 7747eaa36e2SJosef "Jeff" Sipek dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name); 7751b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 7767eaa36e2SJosef "Jeff" Sipek err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op); 7771b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 778a334de28SDavid Shaw 779a334de28SDavid Shaw return err; 7801da177e4SLinus Torvalds } 7811da177e4SLinus Torvalds 782f193fbabSYAMAMOTO Takashi int 7831da177e4SLinus Torvalds nfsd_sync_dir(struct dentry *dp) 7841da177e4SLinus Torvalds { 785f193fbabSYAMAMOTO Takashi return nfsd_dosync(NULL, dp, dp->d_inode->i_fop); 7861da177e4SLinus Torvalds } 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds /* 7891da177e4SLinus Torvalds * Obtain the readahead parameters for the file 7901da177e4SLinus Torvalds * specified by (dev, ino). 7911da177e4SLinus Torvalds */ 7921da177e4SLinus Torvalds 7931da177e4SLinus Torvalds static inline struct raparms * 7941da177e4SLinus Torvalds nfsd_get_raparms(dev_t dev, ino_t ino) 7951da177e4SLinus Torvalds { 7961da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 7971da177e4SLinus Torvalds int depth = 0; 798fce1456aSGreg Banks unsigned int hash; 799fce1456aSGreg Banks struct raparm_hbucket *rab; 8001da177e4SLinus Torvalds 801fce1456aSGreg Banks hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; 802fce1456aSGreg Banks rab = &raparm_hash[hash]; 803fce1456aSGreg Banks 804fce1456aSGreg Banks spin_lock(&rab->pb_lock); 805fce1456aSGreg Banks for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { 8061da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 8071da177e4SLinus Torvalds goto found; 8081da177e4SLinus Torvalds depth++; 8091da177e4SLinus Torvalds if (ra->p_count == 0) 8101da177e4SLinus Torvalds frap = rap; 8111da177e4SLinus Torvalds } 8121da177e4SLinus Torvalds depth = nfsdstats.ra_size*11/10; 8131da177e4SLinus Torvalds if (!frap) { 814fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8151da177e4SLinus Torvalds return NULL; 8161da177e4SLinus Torvalds } 8171da177e4SLinus Torvalds rap = frap; 8181da177e4SLinus Torvalds ra = *frap; 8191da177e4SLinus Torvalds ra->p_dev = dev; 8201da177e4SLinus Torvalds ra->p_ino = ino; 8211da177e4SLinus Torvalds ra->p_set = 0; 822fce1456aSGreg Banks ra->p_hindex = hash; 8231da177e4SLinus Torvalds found: 824fce1456aSGreg Banks if (rap != &rab->pb_head) { 8251da177e4SLinus Torvalds *rap = ra->p_next; 826fce1456aSGreg Banks ra->p_next = rab->pb_head; 827fce1456aSGreg Banks rab->pb_head = ra; 8281da177e4SLinus Torvalds } 8291da177e4SLinus Torvalds ra->p_count++; 8301da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 831fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8321da177e4SLinus Torvalds return ra; 8331da177e4SLinus Torvalds } 8341da177e4SLinus Torvalds 8351da177e4SLinus Torvalds /* 836cf8208d0SJens Axboe * Grab and keep cached pages associated with a file in the svc_rqst 837cf8208d0SJens Axboe * so that they can be passed to the network sendmsg/sendpage routines 838cf8208d0SJens Axboe * directly. They will be released after the sending has completed. 8391da177e4SLinus Torvalds */ 8401da177e4SLinus Torvalds static int 841cf8208d0SJens Axboe nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, 842cf8208d0SJens Axboe struct splice_desc *sd) 8431da177e4SLinus Torvalds { 844cf8208d0SJens Axboe struct svc_rqst *rqstp = sd->u.data; 84544524359SNeilBrown struct page **pp = rqstp->rq_respages + rqstp->rq_resused; 846cf8208d0SJens Axboe struct page *page = buf->page; 847cf8208d0SJens Axboe size_t size; 848cf8208d0SJens Axboe int ret; 8491da177e4SLinus Torvalds 850cac36bb0SJens Axboe ret = buf->ops->confirm(pipe, buf); 851cf8208d0SJens Axboe if (unlikely(ret)) 852cf8208d0SJens Axboe return ret; 853cf8208d0SJens Axboe 854cf8208d0SJens Axboe size = sd->len; 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 8571da177e4SLinus Torvalds get_page(page); 85844524359SNeilBrown put_page(*pp); 85944524359SNeilBrown *pp = page; 86044524359SNeilBrown rqstp->rq_resused++; 861cf8208d0SJens Axboe rqstp->rq_res.page_base = buf->offset; 8621da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 86344524359SNeilBrown } else if (page != pp[-1]) { 8641da177e4SLinus Torvalds get_page(page); 865250f3915SNeilBrown if (*pp) 86644524359SNeilBrown put_page(*pp); 86744524359SNeilBrown *pp = page; 86844524359SNeilBrown rqstp->rq_resused++; 8691da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 87044524359SNeilBrown } else 8711da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8721da177e4SLinus Torvalds 8731da177e4SLinus Torvalds return size; 8741da177e4SLinus Torvalds } 8751da177e4SLinus Torvalds 876cf8208d0SJens Axboe static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, 877cf8208d0SJens Axboe struct splice_desc *sd) 878cf8208d0SJens Axboe { 879cf8208d0SJens Axboe return __splice_from_pipe(pipe, sd, nfsd_splice_actor); 880cf8208d0SJens Axboe } 881cf8208d0SJens Axboe 882a8754beeSDave Hansen static inline int svc_msnfs(struct svc_fh *ffhp) 883a8754beeSDave Hansen { 884a8754beeSDave Hansen #ifdef MSNFS 885a8754beeSDave Hansen return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS); 886a8754beeSDave Hansen #else 887a8754beeSDave Hansen return 0; 888a8754beeSDave Hansen #endif 889a8754beeSDave Hansen } 890a8754beeSDave Hansen 8916264d69dSAl Viro static __be32 8921da177e4SLinus Torvalds nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 8931da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 8941da177e4SLinus Torvalds { 8951da177e4SLinus Torvalds struct inode *inode; 8961da177e4SLinus Torvalds struct raparms *ra; 8971da177e4SLinus Torvalds mm_segment_t oldfs; 8986264d69dSAl Viro __be32 err; 8996264d69dSAl Viro int host_err; 9001da177e4SLinus Torvalds 9011da177e4SLinus Torvalds err = nfserr_perm; 9027eaa36e2SJosef "Jeff" Sipek inode = file->f_path.dentry->d_inode; 903a8754beeSDave Hansen 904a8754beeSDave Hansen if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count)) 9051da177e4SLinus Torvalds goto out; 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds /* Get readahead parameters */ 9081da177e4SLinus Torvalds ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds if (ra && ra->p_set) 9111da177e4SLinus Torvalds file->f_ra = ra->p_ra; 9121da177e4SLinus Torvalds 913cf8208d0SJens Axboe if (file->f_op->splice_read && rqstp->rq_splice_ok) { 914cf8208d0SJens Axboe struct splice_desc sd = { 915cf8208d0SJens Axboe .len = 0, 916cf8208d0SJens Axboe .total_len = *count, 917cf8208d0SJens Axboe .pos = offset, 918cf8208d0SJens Axboe .u.data = rqstp, 919cf8208d0SJens Axboe }; 920cf8208d0SJens Axboe 9214fbef206SJens Axboe rqstp->rq_resused = 1; 922cf8208d0SJens Axboe host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); 9231da177e4SLinus Torvalds } else { 9241da177e4SLinus Torvalds oldfs = get_fs(); 9251da177e4SLinus Torvalds set_fs(KERNEL_DS); 9266264d69dSAl Viro host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); 9271da177e4SLinus Torvalds set_fs(oldfs); 9281da177e4SLinus Torvalds } 9291da177e4SLinus Torvalds 9301da177e4SLinus Torvalds /* Write back readahead params */ 9311da177e4SLinus Torvalds if (ra) { 932fce1456aSGreg Banks struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; 933fce1456aSGreg Banks spin_lock(&rab->pb_lock); 9341da177e4SLinus Torvalds ra->p_ra = file->f_ra; 9351da177e4SLinus Torvalds ra->p_set = 1; 9361da177e4SLinus Torvalds ra->p_count--; 937fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 9381da177e4SLinus Torvalds } 9391da177e4SLinus Torvalds 9406264d69dSAl Viro if (host_err >= 0) { 9416264d69dSAl Viro nfsdstats.io_read += host_err; 9426264d69dSAl Viro *count = host_err; 9431da177e4SLinus Torvalds err = 0; 9447eaa36e2SJosef "Jeff" Sipek fsnotify_access(file->f_path.dentry); 9451da177e4SLinus Torvalds } else 9466264d69dSAl Viro err = nfserrno(host_err); 9471da177e4SLinus Torvalds out: 9481da177e4SLinus Torvalds return err; 9491da177e4SLinus Torvalds } 9501da177e4SLinus Torvalds 9519f708e40SNeil Brown static void kill_suid(struct dentry *dentry) 9529f708e40SNeil Brown { 9539f708e40SNeil Brown struct iattr ia; 954b5376771SSerge E. Hallyn ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; 9559f708e40SNeil Brown 9561b1dcc1bSJes Sorensen mutex_lock(&dentry->d_inode->i_mutex); 9579f708e40SNeil Brown notify_change(dentry, &ia); 9581b1dcc1bSJes Sorensen mutex_unlock(&dentry->d_inode->i_mutex); 9599f708e40SNeil Brown } 9609f708e40SNeil Brown 9616264d69dSAl Viro static __be32 9621da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 9631da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 9641da177e4SLinus Torvalds unsigned long cnt, int *stablep) 9651da177e4SLinus Torvalds { 9661da177e4SLinus Torvalds struct svc_export *exp; 9671da177e4SLinus Torvalds struct dentry *dentry; 9681da177e4SLinus Torvalds struct inode *inode; 9691da177e4SLinus Torvalds mm_segment_t oldfs; 9706264d69dSAl Viro __be32 err = 0; 9716264d69dSAl Viro int host_err; 9721da177e4SLinus Torvalds int stable = *stablep; 9731da177e4SLinus Torvalds 97445bd3b3dSNeilBrown #ifdef MSNFS 9751da177e4SLinus Torvalds err = nfserr_perm; 9761da177e4SLinus Torvalds 9771da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 9787eaa36e2SJosef "Jeff" Sipek (!lock_may_write(file->f_path.dentry->d_inode, offset, cnt))) 9791da177e4SLinus Torvalds goto out; 9801da177e4SLinus Torvalds #endif 9811da177e4SLinus Torvalds 9827eaa36e2SJosef "Jeff" Sipek dentry = file->f_path.dentry; 9831da177e4SLinus Torvalds inode = dentry->d_inode; 9841da177e4SLinus Torvalds exp = fhp->fh_export; 9851da177e4SLinus Torvalds 9861da177e4SLinus Torvalds /* 9871da177e4SLinus Torvalds * Request sync writes if 9881da177e4SLinus Torvalds * - the sync export option has been set, or 9891da177e4SLinus Torvalds * - the client requested O_SYNC behavior (NFSv3 feature). 9901da177e4SLinus Torvalds * - The file system doesn't support fsync(). 9911da177e4SLinus Torvalds * When gathered writes have been configured for this volume, 9921da177e4SLinus Torvalds * flushing the data to disk is handled separately below. 9931da177e4SLinus Torvalds */ 9941da177e4SLinus Torvalds 9953ba15148SHarvey Harrison if (!file->f_op->fsync) {/* COMMIT3 cannot work */ 9961da177e4SLinus Torvalds stable = 2; 9971da177e4SLinus Torvalds *stablep = 2; /* FILE_SYNC */ 9981da177e4SLinus Torvalds } 9991da177e4SLinus Torvalds 10001da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 10011da177e4SLinus Torvalds stable = 0; 10021da177e4SLinus Torvalds if (stable && !EX_WGATHER(exp)) 10031da177e4SLinus Torvalds file->f_flags |= O_SYNC; 10041da177e4SLinus Torvalds 10051da177e4SLinus Torvalds /* Write the data. */ 10061da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 10076264d69dSAl Viro host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); 10081da177e4SLinus Torvalds set_fs(oldfs); 10096264d69dSAl Viro if (host_err >= 0) { 10101da177e4SLinus Torvalds nfsdstats.io_write += cnt; 10117eaa36e2SJosef "Jeff" Sipek fsnotify_modify(file->f_path.dentry); 10121da177e4SLinus Torvalds } 10131da177e4SLinus Torvalds 10141da177e4SLinus Torvalds /* clear setuid/setgid flag after write */ 10156264d69dSAl Viro if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) 10169f708e40SNeil Brown kill_suid(dentry); 10171da177e4SLinus Torvalds 10186264d69dSAl Viro if (host_err >= 0 && stable) { 10191da177e4SLinus Torvalds static ino_t last_ino; 10201da177e4SLinus Torvalds static dev_t last_dev; 10211da177e4SLinus Torvalds 10221da177e4SLinus Torvalds /* 10231da177e4SLinus Torvalds * Gathered writes: If another process is currently 10241da177e4SLinus Torvalds * writing to the file, there's a high chance 10251da177e4SLinus Torvalds * this is another nfsd (triggered by a bulk write 10261da177e4SLinus Torvalds * from a client's biod). Rather than syncing the 10271da177e4SLinus Torvalds * file with each write request, we sleep for 10 msec. 10281da177e4SLinus Torvalds * 10291da177e4SLinus Torvalds * I don't know if this roughly approximates 10301da177e4SLinus Torvalds * C. Juszak's idea of gathered writes, but it's a 10311da177e4SLinus Torvalds * nice and simple solution (IMHO), and it seems to 10321da177e4SLinus Torvalds * work:-) 10331da177e4SLinus Torvalds */ 10341da177e4SLinus Torvalds if (EX_WGATHER(exp)) { 10351da177e4SLinus Torvalds if (atomic_read(&inode->i_writecount) > 1 10361da177e4SLinus Torvalds || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 1037ba25f9dcSPavel Emelyanov dprintk("nfsd: write defer %d\n", task_pid_nr(current)); 10381da177e4SLinus Torvalds msleep(10); 1039ba25f9dcSPavel Emelyanov dprintk("nfsd: write resume %d\n", task_pid_nr(current)); 10401da177e4SLinus Torvalds } 10411da177e4SLinus Torvalds 10421da177e4SLinus Torvalds if (inode->i_state & I_DIRTY) { 1043ba25f9dcSPavel Emelyanov dprintk("nfsd: write sync %d\n", task_pid_nr(current)); 10446264d69dSAl Viro host_err=nfsd_sync(file); 10451da177e4SLinus Torvalds } 10461da177e4SLinus Torvalds #if 0 10471da177e4SLinus Torvalds wake_up(&inode->i_wait); 10481da177e4SLinus Torvalds #endif 10491da177e4SLinus Torvalds } 10501da177e4SLinus Torvalds last_ino = inode->i_ino; 10511da177e4SLinus Torvalds last_dev = inode->i_sb->s_dev; 10521da177e4SLinus Torvalds } 10531da177e4SLinus Torvalds 10546264d69dSAl Viro dprintk("nfsd: write complete host_err=%d\n", host_err); 10556264d69dSAl Viro if (host_err >= 0) 10561da177e4SLinus Torvalds err = 0; 10571da177e4SLinus Torvalds else 10586264d69dSAl Viro err = nfserrno(host_err); 10591da177e4SLinus Torvalds out: 10601da177e4SLinus Torvalds return err; 10611da177e4SLinus Torvalds } 10621da177e4SLinus Torvalds 10631da177e4SLinus Torvalds /* 10641da177e4SLinus Torvalds * Read data from a file. count must contain the requested read count 10651da177e4SLinus Torvalds * on entry. On return, *count contains the number of bytes actually read. 10661da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10671da177e4SLinus Torvalds */ 10686264d69dSAl Viro __be32 10691da177e4SLinus Torvalds nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10701da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 10711da177e4SLinus Torvalds unsigned long *count) 10721da177e4SLinus Torvalds { 10736264d69dSAl Viro __be32 err; 10741da177e4SLinus Torvalds 10751da177e4SLinus Torvalds if (file) { 10760ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 10778837abcaSMiklos Szeredi NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); 10781da177e4SLinus Torvalds if (err) 10791da177e4SLinus Torvalds goto out; 10801da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 10811da177e4SLinus Torvalds } else { 10828837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 10831da177e4SLinus Torvalds if (err) 10841da177e4SLinus Torvalds goto out; 10851da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 10861da177e4SLinus Torvalds nfsd_close(file); 10871da177e4SLinus Torvalds } 10881da177e4SLinus Torvalds out: 10891da177e4SLinus Torvalds return err; 10901da177e4SLinus Torvalds } 10911da177e4SLinus Torvalds 10921da177e4SLinus Torvalds /* 10931da177e4SLinus Torvalds * Write data to a file. 10941da177e4SLinus Torvalds * The stable flag requests synchronous writes. 10951da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10961da177e4SLinus Torvalds */ 10976264d69dSAl Viro __be32 10981da177e4SLinus Torvalds nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10991da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long cnt, 11001da177e4SLinus Torvalds int *stablep) 11011da177e4SLinus Torvalds { 11026264d69dSAl Viro __be32 err = 0; 11031da177e4SLinus Torvalds 11041da177e4SLinus Torvalds if (file) { 11050ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 11068837abcaSMiklos Szeredi NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); 11071da177e4SLinus Torvalds if (err) 11081da177e4SLinus Torvalds goto out; 11091da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, 11101da177e4SLinus Torvalds stablep); 11111da177e4SLinus Torvalds } else { 11128837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 11131da177e4SLinus Torvalds if (err) 11141da177e4SLinus Torvalds goto out; 11151da177e4SLinus Torvalds 11161da177e4SLinus Torvalds if (cnt) 11171da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, 11181da177e4SLinus Torvalds cnt, stablep); 11191da177e4SLinus Torvalds nfsd_close(file); 11201da177e4SLinus Torvalds } 11211da177e4SLinus Torvalds out: 11221da177e4SLinus Torvalds return err; 11231da177e4SLinus Torvalds } 11241da177e4SLinus Torvalds 11251da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 11261da177e4SLinus Torvalds /* 11271da177e4SLinus Torvalds * Commit all pending writes to stable storage. 11281da177e4SLinus Torvalds * Strictly speaking, we could sync just the indicated file region here, 11291da177e4SLinus Torvalds * but there's currently no way we can ask the VFS to do so. 11301da177e4SLinus Torvalds * 11311da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 11321da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 11331da177e4SLinus Torvalds */ 11346264d69dSAl Viro __be32 11351da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 11361da177e4SLinus Torvalds loff_t offset, unsigned long count) 11371da177e4SLinus Torvalds { 11381da177e4SLinus Torvalds struct file *file; 11396264d69dSAl Viro __be32 err; 11401da177e4SLinus Torvalds 11411da177e4SLinus Torvalds if ((u64)count > ~(u64)offset) 11421da177e4SLinus Torvalds return nfserr_inval; 11431da177e4SLinus Torvalds 11448837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 11458837abcaSMiklos Szeredi if (err) 11461da177e4SLinus Torvalds return err; 11471da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 11481da177e4SLinus Torvalds if (file->f_op && file->f_op->fsync) { 114945bd3b3dSNeilBrown err = nfserrno(nfsd_sync(file)); 11501da177e4SLinus Torvalds } else { 11511da177e4SLinus Torvalds err = nfserr_notsupp; 11521da177e4SLinus Torvalds } 11531da177e4SLinus Torvalds } 11541da177e4SLinus Torvalds 11551da177e4SLinus Torvalds nfsd_close(file); 11561da177e4SLinus Torvalds return err; 11571da177e4SLinus Torvalds } 11581da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 11591da177e4SLinus Torvalds 1160f2b0dee2SAdrian Bunk static __be32 11615c002b3bSJ. Bruce Fields nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, 11625c002b3bSJ. Bruce Fields struct iattr *iap) 11635c002b3bSJ. Bruce Fields { 11645c002b3bSJ. Bruce Fields /* 11655c002b3bSJ. Bruce Fields * Mode has already been set earlier in create: 11665c002b3bSJ. Bruce Fields */ 11675c002b3bSJ. Bruce Fields iap->ia_valid &= ~ATTR_MODE; 11685c002b3bSJ. Bruce Fields /* 11695c002b3bSJ. Bruce Fields * Setting uid/gid works only for root. Irix appears to 11705c002b3bSJ. Bruce Fields * send along the gid on create when it tries to implement 11715c002b3bSJ. Bruce Fields * setgid directories via NFS: 11725c002b3bSJ. Bruce Fields */ 11735cc0a840SDavid Howells if (current_fsuid() != 0) 11745c002b3bSJ. Bruce Fields iap->ia_valid &= ~(ATTR_UID|ATTR_GID); 11755c002b3bSJ. Bruce Fields if (iap->ia_valid) 11765c002b3bSJ. Bruce Fields return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 11775c002b3bSJ. Bruce Fields return 0; 11785c002b3bSJ. Bruce Fields } 11795c002b3bSJ. Bruce Fields 11801da177e4SLinus Torvalds /* 11811da177e4SLinus Torvalds * Create a file (regular, directory, device, fifo); UNIX sockets 11821da177e4SLinus Torvalds * not yet implemented. 11831da177e4SLinus Torvalds * If the response fh has been verified, the parent directory should 11841da177e4SLinus Torvalds * already be locked. Note that the parent directory is left locked. 11851da177e4SLinus Torvalds * 11861da177e4SLinus Torvalds * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 11871da177e4SLinus Torvalds */ 11886264d69dSAl Viro __be32 11891da177e4SLinus Torvalds nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 11901da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 11911da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 11921da177e4SLinus Torvalds { 11931da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 11941da177e4SLinus Torvalds struct inode *dirp; 11956264d69dSAl Viro __be32 err; 11965c002b3bSJ. Bruce Fields __be32 err2; 11976264d69dSAl Viro int host_err; 11981da177e4SLinus Torvalds 11991da177e4SLinus Torvalds err = nfserr_perm; 12001da177e4SLinus Torvalds if (!flen) 12011da177e4SLinus Torvalds goto out; 12021da177e4SLinus Torvalds err = nfserr_exist; 12031da177e4SLinus Torvalds if (isdotent(fname, flen)) 12041da177e4SLinus Torvalds goto out; 12051da177e4SLinus Torvalds 12068837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 12071da177e4SLinus Torvalds if (err) 12081da177e4SLinus Torvalds goto out; 12091da177e4SLinus Torvalds 12101da177e4SLinus Torvalds dentry = fhp->fh_dentry; 12111da177e4SLinus Torvalds dirp = dentry->d_inode; 12121da177e4SLinus Torvalds 12131da177e4SLinus Torvalds err = nfserr_notdir; 12141da177e4SLinus Torvalds if(!dirp->i_op || !dirp->i_op->lookup) 12151da177e4SLinus Torvalds goto out; 12161da177e4SLinus Torvalds /* 12171da177e4SLinus Torvalds * Check whether the response file handle has been verified yet. 12181da177e4SLinus Torvalds * If it has, the parent directory should already be locked. 12191da177e4SLinus Torvalds */ 12201da177e4SLinus Torvalds if (!resfhp->fh_dentry) { 12211da177e4SLinus Torvalds /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ 122212fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 12231da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 12246264d69dSAl Viro host_err = PTR_ERR(dchild); 12251da177e4SLinus Torvalds if (IS_ERR(dchild)) 12261da177e4SLinus Torvalds goto out_nfserr; 12271da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 12281da177e4SLinus Torvalds if (err) 12291da177e4SLinus Torvalds goto out; 12301da177e4SLinus Torvalds } else { 12311da177e4SLinus Torvalds /* called from nfsd_proc_create */ 12321da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 12331da177e4SLinus Torvalds if (!fhp->fh_locked) { 12341da177e4SLinus Torvalds /* not actually possible */ 12351da177e4SLinus Torvalds printk(KERN_ERR 12361da177e4SLinus Torvalds "nfsd_create: parent %s/%s not locked!\n", 12371da177e4SLinus Torvalds dentry->d_parent->d_name.name, 12381da177e4SLinus Torvalds dentry->d_name.name); 1239d75f2b9fSAl Viro err = nfserr_io; 12401da177e4SLinus Torvalds goto out; 12411da177e4SLinus Torvalds } 12421da177e4SLinus Torvalds } 12431da177e4SLinus Torvalds /* 12441da177e4SLinus Torvalds * Make sure the child dentry is still negative ... 12451da177e4SLinus Torvalds */ 12461da177e4SLinus Torvalds err = nfserr_exist; 12471da177e4SLinus Torvalds if (dchild->d_inode) { 12481da177e4SLinus Torvalds dprintk("nfsd_create: dentry %s/%s not negative!\n", 12491da177e4SLinus Torvalds dentry->d_name.name, dchild->d_name.name); 12501da177e4SLinus Torvalds goto out; 12511da177e4SLinus Torvalds } 12521da177e4SLinus Torvalds 12531da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 12541da177e4SLinus Torvalds iap->ia_mode = 0; 12551da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 12561da177e4SLinus Torvalds 125707cad1d2SMiklos Szeredi err = nfserr_inval; 125807cad1d2SMiklos Szeredi if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { 125907cad1d2SMiklos Szeredi printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", 126007cad1d2SMiklos Szeredi type); 126107cad1d2SMiklos Szeredi goto out; 126207cad1d2SMiklos Szeredi } 126307cad1d2SMiklos Szeredi 126407cad1d2SMiklos Szeredi host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 126507cad1d2SMiklos Szeredi if (host_err) 126607cad1d2SMiklos Szeredi goto out_nfserr; 126707cad1d2SMiklos Szeredi 12681da177e4SLinus Torvalds /* 12691da177e4SLinus Torvalds * Get the dir op function pointer. 12701da177e4SLinus Torvalds */ 1271088406bcSJ. Bruce Fields err = 0; 12721da177e4SLinus Torvalds switch (type) { 12731da177e4SLinus Torvalds case S_IFREG: 12746264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 12751da177e4SLinus Torvalds break; 12761da177e4SLinus Torvalds case S_IFDIR: 12776264d69dSAl Viro host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); 12781da177e4SLinus Torvalds break; 12791da177e4SLinus Torvalds case S_IFCHR: 12801da177e4SLinus Torvalds case S_IFBLK: 12811da177e4SLinus Torvalds case S_IFIFO: 12821da177e4SLinus Torvalds case S_IFSOCK: 12836264d69dSAl Viro host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 12841da177e4SLinus Torvalds break; 1285463c3197SDave Hansen } 1286463c3197SDave Hansen if (host_err < 0) { 1287463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1288463c3197SDave Hansen goto out_nfserr; 1289463c3197SDave Hansen } 12901da177e4SLinus Torvalds 12911da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 129245bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(dentry)); 12931da177e4SLinus Torvalds write_inode_now(dchild->d_inode, 1); 12941da177e4SLinus Torvalds } 12951da177e4SLinus Torvalds 12965c002b3bSJ. Bruce Fields err2 = nfsd_create_setattr(rqstp, resfhp, iap); 1297f193fbabSYAMAMOTO Takashi if (err2) 1298f193fbabSYAMAMOTO Takashi err = err2; 1299463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 13001da177e4SLinus Torvalds /* 13011da177e4SLinus Torvalds * Update the file handle to get the new inode info. 13021da177e4SLinus Torvalds */ 13031da177e4SLinus Torvalds if (!err) 13041da177e4SLinus Torvalds err = fh_update(resfhp); 13051da177e4SLinus Torvalds out: 13061da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 13071da177e4SLinus Torvalds dput(dchild); 13081da177e4SLinus Torvalds return err; 13091da177e4SLinus Torvalds 13101da177e4SLinus Torvalds out_nfserr: 13116264d69dSAl Viro err = nfserrno(host_err); 13121da177e4SLinus Torvalds goto out; 13131da177e4SLinus Torvalds } 13141da177e4SLinus Torvalds 13151da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 13161da177e4SLinus Torvalds /* 13171da177e4SLinus Torvalds * NFSv3 version of nfsd_create 13181da177e4SLinus Torvalds */ 13196264d69dSAl Viro __be32 13201da177e4SLinus Torvalds nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, 13211da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 13221da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 132381ac95c5SJ. Bruce Fields int *truncp, int *created) 13241da177e4SLinus Torvalds { 13251da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 13261da177e4SLinus Torvalds struct inode *dirp; 13276264d69dSAl Viro __be32 err; 13285c002b3bSJ. Bruce Fields __be32 err2; 13296264d69dSAl Viro int host_err; 13301da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 13311da177e4SLinus Torvalds 13321da177e4SLinus Torvalds err = nfserr_perm; 13331da177e4SLinus Torvalds if (!flen) 13341da177e4SLinus Torvalds goto out; 13351da177e4SLinus Torvalds err = nfserr_exist; 13361da177e4SLinus Torvalds if (isdotent(fname, flen)) 13371da177e4SLinus Torvalds goto out; 13381da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 13391da177e4SLinus Torvalds iap->ia_mode = 0; 13408837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 13411da177e4SLinus Torvalds if (err) 13421da177e4SLinus Torvalds goto out; 13431da177e4SLinus Torvalds 13441da177e4SLinus Torvalds dentry = fhp->fh_dentry; 13451da177e4SLinus Torvalds dirp = dentry->d_inode; 13461da177e4SLinus Torvalds 13471da177e4SLinus Torvalds /* Get all the sanity checks out of the way before 13481da177e4SLinus Torvalds * we lock the parent. */ 13491da177e4SLinus Torvalds err = nfserr_notdir; 13501da177e4SLinus Torvalds if(!dirp->i_op || !dirp->i_op->lookup) 13511da177e4SLinus Torvalds goto out; 135212fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 13531da177e4SLinus Torvalds 13541da177e4SLinus Torvalds /* 13551da177e4SLinus Torvalds * Compose the response file handle. 13561da177e4SLinus Torvalds */ 13571da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 13586264d69dSAl Viro host_err = PTR_ERR(dchild); 13591da177e4SLinus Torvalds if (IS_ERR(dchild)) 13601da177e4SLinus Torvalds goto out_nfserr; 13611da177e4SLinus Torvalds 13621da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 13631da177e4SLinus Torvalds if (err) 13641da177e4SLinus Torvalds goto out; 13651da177e4SLinus Torvalds 13661da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1367c397852cSPeter Staubach /* solaris7 gets confused (bugid 4218508) if these have 1368749997e5SJeff Layton * the high bit set, so just clear the high bits. If this is 1369749997e5SJeff Layton * ever changed to use different attrs for storing the 1370749997e5SJeff Layton * verifier, then do_open_lookup() will also need to be fixed 1371749997e5SJeff Layton * accordingly. 13721da177e4SLinus Torvalds */ 13731da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 13741da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 13751da177e4SLinus Torvalds } 13761da177e4SLinus Torvalds 1377463c3197SDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 1378463c3197SDave Hansen if (host_err) 1379463c3197SDave Hansen goto out_nfserr; 13801da177e4SLinus Torvalds if (dchild->d_inode) { 13811da177e4SLinus Torvalds err = 0; 13821da177e4SLinus Torvalds 13831da177e4SLinus Torvalds switch (createmode) { 13841da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 13851da177e4SLinus Torvalds if (! S_ISREG(dchild->d_inode->i_mode)) 13861da177e4SLinus Torvalds err = nfserr_exist; 13871da177e4SLinus Torvalds else if (truncp) { 13881da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 13891da177e4SLinus Torvalds * differently. we don't want to truncate the 13901da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 13911da177e4SLinus Torvalds * fails for some other reason. furthermore, 13921da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 13931da177e4SLinus Torvalds * according to spec! 13941da177e4SLinus Torvalds */ 13951da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 13961da177e4SLinus Torvalds } 13971da177e4SLinus Torvalds else { 13981da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 13991da177e4SLinus Torvalds goto set_attr; 14001da177e4SLinus Torvalds } 14011da177e4SLinus Torvalds break; 14021da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 14031da177e4SLinus Torvalds if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 14041da177e4SLinus Torvalds && dchild->d_inode->i_atime.tv_sec == v_atime 14051da177e4SLinus Torvalds && dchild->d_inode->i_size == 0 ) 14061da177e4SLinus Torvalds break; 14071da177e4SLinus Torvalds /* fallthru */ 14081da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 14091da177e4SLinus Torvalds err = nfserr_exist; 14101da177e4SLinus Torvalds } 1411463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14121da177e4SLinus Torvalds goto out; 14131da177e4SLinus Torvalds } 14141da177e4SLinus Torvalds 14156264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 1416463c3197SDave Hansen if (host_err < 0) { 1417463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14181da177e4SLinus Torvalds goto out_nfserr; 1419463c3197SDave Hansen } 142081ac95c5SJ. Bruce Fields if (created) 142181ac95c5SJ. Bruce Fields *created = 1; 14221da177e4SLinus Torvalds 14231da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 142445bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(dentry)); 14251da177e4SLinus Torvalds /* setattr will sync the child (or not) */ 14261da177e4SLinus Torvalds } 14271da177e4SLinus Torvalds 14281da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1429c397852cSPeter Staubach /* Cram the verifier into atime/mtime */ 14301da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 1431c397852cSPeter Staubach | ATTR_MTIME_SET|ATTR_ATIME_SET; 14321da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 14331da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 14341da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 14351da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 14361da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 14371da177e4SLinus Torvalds } 14381da177e4SLinus Torvalds 14391da177e4SLinus Torvalds set_attr: 14405c002b3bSJ. Bruce Fields err2 = nfsd_create_setattr(rqstp, resfhp, iap); 1441f193fbabSYAMAMOTO Takashi if (err2) 144245bd3b3dSNeilBrown err = err2; 1443f193fbabSYAMAMOTO Takashi 1444463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1445f193fbabSYAMAMOTO Takashi /* 1446f193fbabSYAMAMOTO Takashi * Update the filehandle to get the new inode info. 1447f193fbabSYAMAMOTO Takashi */ 1448f193fbabSYAMAMOTO Takashi if (!err) 1449f193fbabSYAMAMOTO Takashi err = fh_update(resfhp); 14501da177e4SLinus Torvalds 14511da177e4SLinus Torvalds out: 14521da177e4SLinus Torvalds fh_unlock(fhp); 14531da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 14541da177e4SLinus Torvalds dput(dchild); 14551da177e4SLinus Torvalds return err; 14561da177e4SLinus Torvalds 14571da177e4SLinus Torvalds out_nfserr: 14586264d69dSAl Viro err = nfserrno(host_err); 14591da177e4SLinus Torvalds goto out; 14601da177e4SLinus Torvalds } 14611da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 14621da177e4SLinus Torvalds 14631da177e4SLinus Torvalds /* 14641da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 14651da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 14661da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 14671da177e4SLinus Torvalds */ 14686264d69dSAl Viro __be32 14691da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 14701da177e4SLinus Torvalds { 14711da177e4SLinus Torvalds struct dentry *dentry; 14721da177e4SLinus Torvalds struct inode *inode; 14731da177e4SLinus Torvalds mm_segment_t oldfs; 14746264d69dSAl Viro __be32 err; 14756264d69dSAl Viro int host_err; 14761da177e4SLinus Torvalds 14778837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); 14781da177e4SLinus Torvalds if (err) 14791da177e4SLinus Torvalds goto out; 14801da177e4SLinus Torvalds 14811da177e4SLinus Torvalds dentry = fhp->fh_dentry; 14821da177e4SLinus Torvalds inode = dentry->d_inode; 14831da177e4SLinus Torvalds 14841da177e4SLinus Torvalds err = nfserr_inval; 14851da177e4SLinus Torvalds if (!inode->i_op || !inode->i_op->readlink) 14861da177e4SLinus Torvalds goto out; 14871da177e4SLinus Torvalds 148854775491SJan Blunck touch_atime(fhp->fh_export->ex_path.mnt, dentry); 14891da177e4SLinus Torvalds /* N.B. Why does this call need a get_fs()?? 14901da177e4SLinus Torvalds * Remove the set_fs and watch the fireworks:-) --okir 14911da177e4SLinus Torvalds */ 14921da177e4SLinus Torvalds 14931da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 14946264d69dSAl Viro host_err = inode->i_op->readlink(dentry, buf, *lenp); 14951da177e4SLinus Torvalds set_fs(oldfs); 14961da177e4SLinus Torvalds 14976264d69dSAl Viro if (host_err < 0) 14981da177e4SLinus Torvalds goto out_nfserr; 14996264d69dSAl Viro *lenp = host_err; 15001da177e4SLinus Torvalds err = 0; 15011da177e4SLinus Torvalds out: 15021da177e4SLinus Torvalds return err; 15031da177e4SLinus Torvalds 15041da177e4SLinus Torvalds out_nfserr: 15056264d69dSAl Viro err = nfserrno(host_err); 15061da177e4SLinus Torvalds goto out; 15071da177e4SLinus Torvalds } 15081da177e4SLinus Torvalds 15091da177e4SLinus Torvalds /* 15101da177e4SLinus Torvalds * Create a symlink and look up its inode 15111da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 15121da177e4SLinus Torvalds */ 15136264d69dSAl Viro __be32 15141da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 15151da177e4SLinus Torvalds char *fname, int flen, 15161da177e4SLinus Torvalds char *path, int plen, 15171da177e4SLinus Torvalds struct svc_fh *resfhp, 15181da177e4SLinus Torvalds struct iattr *iap) 15191da177e4SLinus Torvalds { 15201da177e4SLinus Torvalds struct dentry *dentry, *dnew; 15216264d69dSAl Viro __be32 err, cerr; 15226264d69dSAl Viro int host_err; 15231da177e4SLinus Torvalds 15241da177e4SLinus Torvalds err = nfserr_noent; 15251da177e4SLinus Torvalds if (!flen || !plen) 15261da177e4SLinus Torvalds goto out; 15271da177e4SLinus Torvalds err = nfserr_exist; 15281da177e4SLinus Torvalds if (isdotent(fname, flen)) 15291da177e4SLinus Torvalds goto out; 15301da177e4SLinus Torvalds 15318837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 15321da177e4SLinus Torvalds if (err) 15331da177e4SLinus Torvalds goto out; 15341da177e4SLinus Torvalds fh_lock(fhp); 15351da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15361da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 15376264d69dSAl Viro host_err = PTR_ERR(dnew); 15381da177e4SLinus Torvalds if (IS_ERR(dnew)) 15391da177e4SLinus Torvalds goto out_nfserr; 15401da177e4SLinus Torvalds 154175c3f29dSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 154275c3f29dSDave Hansen if (host_err) 154375c3f29dSDave Hansen goto out_nfserr; 154475c3f29dSDave Hansen 15451da177e4SLinus Torvalds if (unlikely(path[plen] != 0)) { 15461da177e4SLinus Torvalds char *path_alloced = kmalloc(plen+1, GFP_KERNEL); 15471da177e4SLinus Torvalds if (path_alloced == NULL) 15486264d69dSAl Viro host_err = -ENOMEM; 15491da177e4SLinus Torvalds else { 15501da177e4SLinus Torvalds strncpy(path_alloced, path, plen); 15511da177e4SLinus Torvalds path_alloced[plen] = 0; 1552db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); 15531da177e4SLinus Torvalds kfree(path_alloced); 15541da177e4SLinus Torvalds } 15551da177e4SLinus Torvalds } else 1556db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path); 15571da177e4SLinus Torvalds 15586264d69dSAl Viro if (!host_err) { 15591da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 15606264d69dSAl Viro host_err = nfsd_sync_dir(dentry); 15616264d69dSAl Viro } 15626264d69dSAl Viro err = nfserrno(host_err); 15631da177e4SLinus Torvalds fh_unlock(fhp); 15641da177e4SLinus Torvalds 156575c3f29dSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 156675c3f29dSDave Hansen 15671da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 15681da177e4SLinus Torvalds dput(dnew); 15691da177e4SLinus Torvalds if (err==0) err = cerr; 15701da177e4SLinus Torvalds out: 15711da177e4SLinus Torvalds return err; 15721da177e4SLinus Torvalds 15731da177e4SLinus Torvalds out_nfserr: 15746264d69dSAl Viro err = nfserrno(host_err); 15751da177e4SLinus Torvalds goto out; 15761da177e4SLinus Torvalds } 15771da177e4SLinus Torvalds 15781da177e4SLinus Torvalds /* 15791da177e4SLinus Torvalds * Create a hardlink 15801da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 15811da177e4SLinus Torvalds */ 15826264d69dSAl Viro __be32 15831da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 15841da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 15851da177e4SLinus Torvalds { 15861da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 15871da177e4SLinus Torvalds struct inode *dirp, *dest; 15886264d69dSAl Viro __be32 err; 15896264d69dSAl Viro int host_err; 15901da177e4SLinus Torvalds 15918837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); 15921da177e4SLinus Torvalds if (err) 15931da177e4SLinus Torvalds goto out; 15948837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP); 15951da177e4SLinus Torvalds if (err) 15961da177e4SLinus Torvalds goto out; 15971da177e4SLinus Torvalds 15981da177e4SLinus Torvalds err = nfserr_perm; 15991da177e4SLinus Torvalds if (!len) 16001da177e4SLinus Torvalds goto out; 16011da177e4SLinus Torvalds err = nfserr_exist; 16021da177e4SLinus Torvalds if (isdotent(name, len)) 16031da177e4SLinus Torvalds goto out; 16041da177e4SLinus Torvalds 160512fd3520SPeter Zijlstra fh_lock_nested(ffhp, I_MUTEX_PARENT); 16061da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 16071da177e4SLinus Torvalds dirp = ddir->d_inode; 16081da177e4SLinus Torvalds 16091da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 16106264d69dSAl Viro host_err = PTR_ERR(dnew); 16111da177e4SLinus Torvalds if (IS_ERR(dnew)) 16121da177e4SLinus Torvalds goto out_nfserr; 16131da177e4SLinus Torvalds 16141da177e4SLinus Torvalds dold = tfhp->fh_dentry; 16151da177e4SLinus Torvalds dest = dold->d_inode; 16161da177e4SLinus Torvalds 161775c3f29dSDave Hansen host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt); 161875c3f29dSDave Hansen if (host_err) { 161975c3f29dSDave Hansen err = nfserrno(host_err); 162075c3f29dSDave Hansen goto out_dput; 162175c3f29dSDave Hansen } 16226264d69dSAl Viro host_err = vfs_link(dold, dirp, dnew); 16236264d69dSAl Viro if (!host_err) { 16241da177e4SLinus Torvalds if (EX_ISSYNC(ffhp->fh_export)) { 162545bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(ddir)); 16261da177e4SLinus Torvalds write_inode_now(dest, 1); 16271da177e4SLinus Torvalds } 16286264d69dSAl Viro err = 0; 16291da177e4SLinus Torvalds } else { 16306264d69dSAl Viro if (host_err == -EXDEV && rqstp->rq_vers == 2) 16311da177e4SLinus Torvalds err = nfserr_acces; 16321da177e4SLinus Torvalds else 16336264d69dSAl Viro err = nfserrno(host_err); 16341da177e4SLinus Torvalds } 163575c3f29dSDave Hansen mnt_drop_write(tfhp->fh_export->ex_path.mnt); 163675c3f29dSDave Hansen out_dput: 16371da177e4SLinus Torvalds dput(dnew); 1638270d56e5SDavid M. Richter out_unlock: 1639270d56e5SDavid M. Richter fh_unlock(ffhp); 16401da177e4SLinus Torvalds out: 16411da177e4SLinus Torvalds return err; 16421da177e4SLinus Torvalds 16431da177e4SLinus Torvalds out_nfserr: 16446264d69dSAl Viro err = nfserrno(host_err); 1645270d56e5SDavid M. Richter goto out_unlock; 16461da177e4SLinus Torvalds } 16471da177e4SLinus Torvalds 16481da177e4SLinus Torvalds /* 16491da177e4SLinus Torvalds * Rename a file 16501da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16511da177e4SLinus Torvalds */ 16526264d69dSAl Viro __be32 16531da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 16541da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 16551da177e4SLinus Torvalds { 16561da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 16571da177e4SLinus Torvalds struct inode *fdir, *tdir; 16586264d69dSAl Viro __be32 err; 16596264d69dSAl Viro int host_err; 16601da177e4SLinus Torvalds 16618837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); 16621da177e4SLinus Torvalds if (err) 16631da177e4SLinus Torvalds goto out; 16648837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); 16651da177e4SLinus Torvalds if (err) 16661da177e4SLinus Torvalds goto out; 16671da177e4SLinus Torvalds 16681da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 16691da177e4SLinus Torvalds fdir = fdentry->d_inode; 16701da177e4SLinus Torvalds 16711da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 16721da177e4SLinus Torvalds tdir = tdentry->d_inode; 16731da177e4SLinus Torvalds 16741da177e4SLinus Torvalds err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; 1675a56f3937SNeilBrown if (ffhp->fh_export != tfhp->fh_export) 16761da177e4SLinus Torvalds goto out; 16771da177e4SLinus Torvalds 16781da177e4SLinus Torvalds err = nfserr_perm; 16791da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 16801da177e4SLinus Torvalds goto out; 16811da177e4SLinus Torvalds 16821da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 16831da177e4SLinus Torvalds * so do it by hand */ 16841da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 16851da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 1; 16861da177e4SLinus Torvalds fill_pre_wcc(ffhp); 16871da177e4SLinus Torvalds fill_pre_wcc(tfhp); 16881da177e4SLinus Torvalds 16891da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 16906264d69dSAl Viro host_err = PTR_ERR(odentry); 16911da177e4SLinus Torvalds if (IS_ERR(odentry)) 16921da177e4SLinus Torvalds goto out_nfserr; 16931da177e4SLinus Torvalds 16946264d69dSAl Viro host_err = -ENOENT; 16951da177e4SLinus Torvalds if (!odentry->d_inode) 16961da177e4SLinus Torvalds goto out_dput_old; 16976264d69dSAl Viro host_err = -EINVAL; 16981da177e4SLinus Torvalds if (odentry == trap) 16991da177e4SLinus Torvalds goto out_dput_old; 17001da177e4SLinus Torvalds 17011da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 17026264d69dSAl Viro host_err = PTR_ERR(ndentry); 17031da177e4SLinus Torvalds if (IS_ERR(ndentry)) 17041da177e4SLinus Torvalds goto out_dput_old; 17056264d69dSAl Viro host_err = -ENOTEMPTY; 17061da177e4SLinus Torvalds if (ndentry == trap) 17071da177e4SLinus Torvalds goto out_dput_new; 17081da177e4SLinus Torvalds 17099079b1ebSDave Hansen if (svc_msnfs(ffhp) && 17101da177e4SLinus Torvalds ((atomic_read(&odentry->d_count) > 1) 17111da177e4SLinus Torvalds || (atomic_read(&ndentry->d_count) > 1))) { 17126264d69dSAl Viro host_err = -EPERM; 17139079b1ebSDave Hansen goto out_dput_new; 17149079b1ebSDave Hansen } 17159079b1ebSDave Hansen 17169079b1ebSDave Hansen host_err = -EXDEV; 17179079b1ebSDave Hansen if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) 17189079b1ebSDave Hansen goto out_dput_new; 17199079b1ebSDave Hansen host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt); 17209079b1ebSDave Hansen if (host_err) 17219079b1ebSDave Hansen goto out_dput_new; 17229079b1ebSDave Hansen 17236264d69dSAl Viro host_err = vfs_rename(fdir, odentry, tdir, ndentry); 17246264d69dSAl Viro if (!host_err && EX_ISSYNC(tfhp->fh_export)) { 17256264d69dSAl Viro host_err = nfsd_sync_dir(tdentry); 17266264d69dSAl Viro if (!host_err) 17276264d69dSAl Viro host_err = nfsd_sync_dir(fdentry); 17281da177e4SLinus Torvalds } 17291da177e4SLinus Torvalds 17309079b1ebSDave Hansen mnt_drop_write(ffhp->fh_export->ex_path.mnt); 17319079b1ebSDave Hansen 17321da177e4SLinus Torvalds out_dput_new: 17331da177e4SLinus Torvalds dput(ndentry); 17341da177e4SLinus Torvalds out_dput_old: 17351da177e4SLinus Torvalds dput(odentry); 17361da177e4SLinus Torvalds out_nfserr: 17376264d69dSAl Viro err = nfserrno(host_err); 17381da177e4SLinus Torvalds 17391da177e4SLinus Torvalds /* we cannot reply on fh_unlock on the two filehandles, 17401da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 17411da177e4SLinus Torvalds * were the same, so again we do it by hand 17421da177e4SLinus Torvalds */ 17431da177e4SLinus Torvalds fill_post_wcc(ffhp); 17441da177e4SLinus Torvalds fill_post_wcc(tfhp); 17451da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 17461da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 0; 17471da177e4SLinus Torvalds 17481da177e4SLinus Torvalds out: 17491da177e4SLinus Torvalds return err; 17501da177e4SLinus Torvalds } 17511da177e4SLinus Torvalds 17521da177e4SLinus Torvalds /* 17531da177e4SLinus Torvalds * Unlink a file or directory 17541da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 17551da177e4SLinus Torvalds */ 17566264d69dSAl Viro __be32 17571da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 17581da177e4SLinus Torvalds char *fname, int flen) 17591da177e4SLinus Torvalds { 17601da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 17611da177e4SLinus Torvalds struct inode *dirp; 17626264d69dSAl Viro __be32 err; 17636264d69dSAl Viro int host_err; 17641da177e4SLinus Torvalds 17651da177e4SLinus Torvalds err = nfserr_acces; 17661da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 17671da177e4SLinus Torvalds goto out; 17688837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); 17691da177e4SLinus Torvalds if (err) 17701da177e4SLinus Torvalds goto out; 17711da177e4SLinus Torvalds 177212fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 17731da177e4SLinus Torvalds dentry = fhp->fh_dentry; 17741da177e4SLinus Torvalds dirp = dentry->d_inode; 17751da177e4SLinus Torvalds 17761da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 17776264d69dSAl Viro host_err = PTR_ERR(rdentry); 17781da177e4SLinus Torvalds if (IS_ERR(rdentry)) 17791da177e4SLinus Torvalds goto out_nfserr; 17801da177e4SLinus Torvalds 17811da177e4SLinus Torvalds if (!rdentry->d_inode) { 17821da177e4SLinus Torvalds dput(rdentry); 17831da177e4SLinus Torvalds err = nfserr_noent; 17841da177e4SLinus Torvalds goto out; 17851da177e4SLinus Torvalds } 17861da177e4SLinus Torvalds 17871da177e4SLinus Torvalds if (!type) 17881da177e4SLinus Torvalds type = rdentry->d_inode->i_mode & S_IFMT; 17891da177e4SLinus Torvalds 17900622753bSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 17910622753bSDave Hansen if (host_err) 17920622753bSDave Hansen goto out_nfserr; 17930622753bSDave Hansen 17941da177e4SLinus Torvalds if (type != S_IFDIR) { /* It's UNLINK */ 17951da177e4SLinus Torvalds #ifdef MSNFS 17961da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 17971da177e4SLinus Torvalds (atomic_read(&rdentry->d_count) > 1)) { 17986264d69dSAl Viro host_err = -EPERM; 17991da177e4SLinus Torvalds } else 18001da177e4SLinus Torvalds #endif 18016264d69dSAl Viro host_err = vfs_unlink(dirp, rdentry); 18021da177e4SLinus Torvalds } else { /* It's RMDIR */ 18036264d69dSAl Viro host_err = vfs_rmdir(dirp, rdentry); 18041da177e4SLinus Torvalds } 18051da177e4SLinus Torvalds 18061da177e4SLinus Torvalds dput(rdentry); 18071da177e4SLinus Torvalds 18086264d69dSAl Viro if (host_err) 18090622753bSDave Hansen goto out_drop; 18106264d69dSAl Viro if (EX_ISSYNC(fhp->fh_export)) 18116264d69dSAl Viro host_err = nfsd_sync_dir(dentry); 18121da177e4SLinus Torvalds 18130622753bSDave Hansen out_drop: 18140622753bSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 18151da177e4SLinus Torvalds out_nfserr: 18166264d69dSAl Viro err = nfserrno(host_err); 1817f193fbabSYAMAMOTO Takashi out: 1818f193fbabSYAMAMOTO Takashi return err; 18191da177e4SLinus Torvalds } 18201da177e4SLinus Torvalds 18211da177e4SLinus Torvalds /* 182214f7dd63SDavid Woodhouse * We do this buffering because we must not call back into the file 182314f7dd63SDavid Woodhouse * system's ->lookup() method from the filldir callback. That may well 182414f7dd63SDavid Woodhouse * deadlock a number of file systems. 182514f7dd63SDavid Woodhouse * 182614f7dd63SDavid Woodhouse * This is based heavily on the implementation of same in XFS. 182714f7dd63SDavid Woodhouse */ 182814f7dd63SDavid Woodhouse struct buffered_dirent { 182914f7dd63SDavid Woodhouse u64 ino; 183014f7dd63SDavid Woodhouse loff_t offset; 183114f7dd63SDavid Woodhouse int namlen; 183214f7dd63SDavid Woodhouse unsigned int d_type; 183314f7dd63SDavid Woodhouse char name[]; 183414f7dd63SDavid Woodhouse }; 183514f7dd63SDavid Woodhouse 183614f7dd63SDavid Woodhouse struct readdir_data { 183714f7dd63SDavid Woodhouse char *dirent; 183814f7dd63SDavid Woodhouse size_t used; 183953c9c5c0SAl Viro int full; 184014f7dd63SDavid Woodhouse }; 184114f7dd63SDavid Woodhouse 184214f7dd63SDavid Woodhouse static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, 184314f7dd63SDavid Woodhouse loff_t offset, u64 ino, unsigned int d_type) 184414f7dd63SDavid Woodhouse { 184514f7dd63SDavid Woodhouse struct readdir_data *buf = __buf; 184614f7dd63SDavid Woodhouse struct buffered_dirent *de = (void *)(buf->dirent + buf->used); 184714f7dd63SDavid Woodhouse unsigned int reclen; 184814f7dd63SDavid Woodhouse 184914f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); 185053c9c5c0SAl Viro if (buf->used + reclen > PAGE_SIZE) { 185153c9c5c0SAl Viro buf->full = 1; 185214f7dd63SDavid Woodhouse return -EINVAL; 185353c9c5c0SAl Viro } 185414f7dd63SDavid Woodhouse 185514f7dd63SDavid Woodhouse de->namlen = namlen; 185614f7dd63SDavid Woodhouse de->offset = offset; 185714f7dd63SDavid Woodhouse de->ino = ino; 185814f7dd63SDavid Woodhouse de->d_type = d_type; 185914f7dd63SDavid Woodhouse memcpy(de->name, name, namlen); 186014f7dd63SDavid Woodhouse buf->used += reclen; 186114f7dd63SDavid Woodhouse 186214f7dd63SDavid Woodhouse return 0; 186314f7dd63SDavid Woodhouse } 186414f7dd63SDavid Woodhouse 186514f7dd63SDavid Woodhouse static int nfsd_buffered_readdir(struct file *file, filldir_t func, 18662628b766SDavid Woodhouse struct readdir_cd *cdp, loff_t *offsetp) 18672628b766SDavid Woodhouse { 186814f7dd63SDavid Woodhouse struct readdir_data buf; 186914f7dd63SDavid Woodhouse struct buffered_dirent *de; 18702628b766SDavid Woodhouse int host_err; 187114f7dd63SDavid Woodhouse int size; 187214f7dd63SDavid Woodhouse loff_t offset; 18732628b766SDavid Woodhouse 187414f7dd63SDavid Woodhouse buf.dirent = (void *)__get_free_page(GFP_KERNEL); 187514f7dd63SDavid Woodhouse if (!buf.dirent) 187614f7dd63SDavid Woodhouse return -ENOMEM; 187714f7dd63SDavid Woodhouse 187814f7dd63SDavid Woodhouse offset = *offsetp; 18792628b766SDavid Woodhouse cdp->err = nfserr_eof; /* will be cleared on successful read */ 18802628b766SDavid Woodhouse 188114f7dd63SDavid Woodhouse while (1) { 188214f7dd63SDavid Woodhouse unsigned int reclen; 188314f7dd63SDavid Woodhouse 188414f7dd63SDavid Woodhouse buf.used = 0; 188553c9c5c0SAl Viro buf.full = 0; 188614f7dd63SDavid Woodhouse 188714f7dd63SDavid Woodhouse host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf); 188853c9c5c0SAl Viro if (buf.full) 188953c9c5c0SAl Viro host_err = 0; 189053c9c5c0SAl Viro 189153c9c5c0SAl Viro if (host_err < 0) 189214f7dd63SDavid Woodhouse break; 189314f7dd63SDavid Woodhouse 189414f7dd63SDavid Woodhouse size = buf.used; 189514f7dd63SDavid Woodhouse 189614f7dd63SDavid Woodhouse if (!size) 189714f7dd63SDavid Woodhouse break; 189814f7dd63SDavid Woodhouse 189914f7dd63SDavid Woodhouse de = (struct buffered_dirent *)buf.dirent; 190014f7dd63SDavid Woodhouse while (size > 0) { 190114f7dd63SDavid Woodhouse offset = de->offset; 190214f7dd63SDavid Woodhouse 190314f7dd63SDavid Woodhouse if (func(cdp, de->name, de->namlen, de->offset, 190414f7dd63SDavid Woodhouse de->ino, de->d_type)) 190514f7dd63SDavid Woodhouse goto done; 190614f7dd63SDavid Woodhouse 190714f7dd63SDavid Woodhouse if (cdp->err != nfs_ok) 190814f7dd63SDavid Woodhouse goto done; 190914f7dd63SDavid Woodhouse 191014f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(*de) + de->namlen, 191114f7dd63SDavid Woodhouse sizeof(u64)); 191214f7dd63SDavid Woodhouse size -= reclen; 191314f7dd63SDavid Woodhouse de = (struct buffered_dirent *)((char *)de + reclen); 191414f7dd63SDavid Woodhouse } 1915c002a6c7SDavid Woodhouse offset = vfs_llseek(file, 0, SEEK_CUR); 19168d7c4203SJ. Bruce Fields cdp->err = nfserr_eof; 1917c002a6c7SDavid Woodhouse if (!buf.full) 1918c002a6c7SDavid Woodhouse break; 191914f7dd63SDavid Woodhouse } 192014f7dd63SDavid Woodhouse 192114f7dd63SDavid Woodhouse done: 192214f7dd63SDavid Woodhouse free_page((unsigned long)(buf.dirent)); 19232628b766SDavid Woodhouse 19242628b766SDavid Woodhouse if (host_err) 19252628b766SDavid Woodhouse return nfserrno(host_err); 192614f7dd63SDavid Woodhouse 192714f7dd63SDavid Woodhouse *offsetp = offset; 19282628b766SDavid Woodhouse return cdp->err; 19292628b766SDavid Woodhouse } 19302628b766SDavid Woodhouse 19311da177e4SLinus Torvalds /* 19321da177e4SLinus Torvalds * Read entries from a directory. 19331da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 19341da177e4SLinus Torvalds */ 19356264d69dSAl Viro __be32 19361da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 1937a0ad13efSNeilBrown struct readdir_cd *cdp, filldir_t func) 19381da177e4SLinus Torvalds { 19396264d69dSAl Viro __be32 err; 19401da177e4SLinus Torvalds struct file *file; 19411da177e4SLinus Torvalds loff_t offset = *offsetp; 19421da177e4SLinus Torvalds 19438837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file); 19441da177e4SLinus Torvalds if (err) 19451da177e4SLinus Torvalds goto out; 19461da177e4SLinus Torvalds 19471da177e4SLinus Torvalds offset = vfs_llseek(file, offset, 0); 19481da177e4SLinus Torvalds if (offset < 0) { 19491da177e4SLinus Torvalds err = nfserrno((int)offset); 19501da177e4SLinus Torvalds goto out_close; 19511da177e4SLinus Torvalds } 19521da177e4SLinus Torvalds 195314f7dd63SDavid Woodhouse err = nfsd_buffered_readdir(file, func, cdp, offsetp); 19541da177e4SLinus Torvalds 19551da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 19561da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 19571da177e4SLinus Torvalds out_close: 19581da177e4SLinus Torvalds nfsd_close(file); 19591da177e4SLinus Torvalds out: 19601da177e4SLinus Torvalds return err; 19611da177e4SLinus Torvalds } 19621da177e4SLinus Torvalds 19631da177e4SLinus Torvalds /* 19641da177e4SLinus Torvalds * Get file system stats 19651da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 19661da177e4SLinus Torvalds */ 19676264d69dSAl Viro __be32 196804716e66SJ. Bruce Fields nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) 19691da177e4SLinus Torvalds { 197004716e66SJ. Bruce Fields __be32 err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); 1971726c3342SDavid Howells if (!err && vfs_statfs(fhp->fh_dentry,stat)) 19721da177e4SLinus Torvalds err = nfserr_io; 19731da177e4SLinus Torvalds return err; 19741da177e4SLinus Torvalds } 19751da177e4SLinus Torvalds 1976c7d51402SJ. Bruce Fields static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) 1977e22841c6SJ. Bruce Fields { 1978c7d51402SJ. Bruce Fields return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; 1979e22841c6SJ. Bruce Fields } 1980e22841c6SJ. Bruce Fields 19811da177e4SLinus Torvalds /* 19821da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 19831da177e4SLinus Torvalds */ 19846264d69dSAl Viro __be32 19850ec757dfSJ. Bruce Fields nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, 19860ec757dfSJ. Bruce Fields struct dentry *dentry, int acc) 19871da177e4SLinus Torvalds { 19881da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 19891da177e4SLinus Torvalds int err; 19901da177e4SLinus Torvalds 19918837abcaSMiklos Szeredi if (acc == NFSD_MAY_NOP) 19921da177e4SLinus Torvalds return 0; 19931da177e4SLinus Torvalds #if 0 19941da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 19951da177e4SLinus Torvalds acc, 19968837abcaSMiklos Szeredi (acc & NFSD_MAY_READ)? " read" : "", 19978837abcaSMiklos Szeredi (acc & NFSD_MAY_WRITE)? " write" : "", 19988837abcaSMiklos Szeredi (acc & NFSD_MAY_EXEC)? " exec" : "", 19998837abcaSMiklos Szeredi (acc & NFSD_MAY_SATTR)? " sattr" : "", 20008837abcaSMiklos Szeredi (acc & NFSD_MAY_TRUNC)? " trunc" : "", 20018837abcaSMiklos Szeredi (acc & NFSD_MAY_LOCK)? " lock" : "", 20028837abcaSMiklos Szeredi (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", 20031da177e4SLinus Torvalds inode->i_mode, 20041da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 20051da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 20062c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); 20071da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 20085cc0a840SDavid Howells inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); 20091da177e4SLinus Torvalds #endif 20101da177e4SLinus Torvalds 20111da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 20121da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 20131da177e4SLinus Torvalds * device special file, we ignore rofs. 20141da177e4SLinus Torvalds */ 20158837abcaSMiklos Szeredi if (!(acc & NFSD_MAY_LOCAL_ACCESS)) 20168837abcaSMiklos Szeredi if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { 20172c463e95SDave Hansen if (exp_rdonly(rqstp, exp) || 20182c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)) 20191da177e4SLinus Torvalds return nfserr_rofs; 20208837abcaSMiklos Szeredi if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) 20211da177e4SLinus Torvalds return nfserr_perm; 20221da177e4SLinus Torvalds } 20238837abcaSMiklos Szeredi if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) 20241da177e4SLinus Torvalds return nfserr_perm; 20251da177e4SLinus Torvalds 20268837abcaSMiklos Szeredi if (acc & NFSD_MAY_LOCK) { 20271da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 20281da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 20291da177e4SLinus Torvalds * ownership 20301da177e4SLinus Torvalds */ 20311da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 20321da177e4SLinus Torvalds return 0; 20331da177e4SLinus Torvalds else 20348837abcaSMiklos Szeredi acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; 20351da177e4SLinus Torvalds } 20361da177e4SLinus Torvalds /* 20371da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 20381da177e4SLinus Torvalds * would normally be checked at open time. This is to make 20391da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 20401da177e4SLinus Torvalds * 20411da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 20421da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 20431da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 20441da177e4SLinus Torvalds * always implies file truncation. 20451da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 20461da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 20471da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 20481da177e4SLinus Torvalds * with NFSv3. 20491da177e4SLinus Torvalds */ 20508837abcaSMiklos Szeredi if ((acc & NFSD_MAY_OWNER_OVERRIDE) && 20515cc0a840SDavid Howells inode->i_uid == current_fsuid()) 20521da177e4SLinus Torvalds return 0; 20531da177e4SLinus Torvalds 20548837abcaSMiklos Szeredi /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ 2055f419a2e3SAl Viro err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); 20561da177e4SLinus Torvalds 20571da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 20581da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 20598837abcaSMiklos Szeredi acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE)) 2060f419a2e3SAl Viro err = inode_permission(inode, MAY_EXEC); 20611da177e4SLinus Torvalds 20621da177e4SLinus Torvalds return err? nfserrno(err) : 0; 20631da177e4SLinus Torvalds } 20641da177e4SLinus Torvalds 20651da177e4SLinus Torvalds void 20661da177e4SLinus Torvalds nfsd_racache_shutdown(void) 20671da177e4SLinus Torvalds { 206854a66e54SJeff Layton struct raparms *raparm, *last_raparm; 206954a66e54SJeff Layton unsigned int i; 207054a66e54SJeff Layton 20711da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 207254a66e54SJeff Layton 207354a66e54SJeff Layton for (i = 0; i < RAPARM_HASH_SIZE; i++) { 207454a66e54SJeff Layton raparm = raparm_hash[i].pb_head; 207554a66e54SJeff Layton while(raparm) { 207654a66e54SJeff Layton last_raparm = raparm; 207754a66e54SJeff Layton raparm = raparm->p_next; 207854a66e54SJeff Layton kfree(last_raparm); 207954a66e54SJeff Layton } 208054a66e54SJeff Layton raparm_hash[i].pb_head = NULL; 208154a66e54SJeff Layton } 20821da177e4SLinus Torvalds } 20831da177e4SLinus Torvalds /* 20841da177e4SLinus Torvalds * Initialize readahead param cache 20851da177e4SLinus Torvalds */ 20861da177e4SLinus Torvalds int 20871da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 20881da177e4SLinus Torvalds { 20891da177e4SLinus Torvalds int i; 2090fce1456aSGreg Banks int j = 0; 2091fce1456aSGreg Banks int nperbucket; 209254a66e54SJeff Layton struct raparms **raparm = NULL; 20931da177e4SLinus Torvalds 2094fce1456aSGreg Banks 209554a66e54SJeff Layton if (raparm_hash[0].pb_head) 20961da177e4SLinus Torvalds return 0; 209754a66e54SJeff Layton nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); 209854a66e54SJeff Layton if (nperbucket < 2) 209954a66e54SJeff Layton nperbucket = 2; 210054a66e54SJeff Layton cache_size = nperbucket * RAPARM_HASH_SIZE; 21014b3bb06bSYan Burman 21024b3bb06bSYan Burman dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); 210354a66e54SJeff Layton 2104fce1456aSGreg Banks for (i = 0; i < RAPARM_HASH_SIZE; i++) { 2105fce1456aSGreg Banks spin_lock_init(&raparm_hash[i].pb_lock); 210654a66e54SJeff Layton 210754a66e54SJeff Layton raparm = &raparm_hash[i].pb_head; 210854a66e54SJeff Layton for (j = 0; j < nperbucket; j++) { 210954a66e54SJeff Layton *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); 211054a66e54SJeff Layton if (!*raparm) 211154a66e54SJeff Layton goto out_nomem; 211254a66e54SJeff Layton raparm = &(*raparm)->p_next; 2113fce1456aSGreg Banks } 211454a66e54SJeff Layton *raparm = NULL; 21151da177e4SLinus Torvalds } 21164b3bb06bSYan Burman 21171da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 21181da177e4SLinus Torvalds return 0; 211954a66e54SJeff Layton 212054a66e54SJeff Layton out_nomem: 212154a66e54SJeff Layton dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); 212254a66e54SJeff Layton nfsd_racache_shutdown(); 212354a66e54SJeff Layton return -ENOMEM; 21241da177e4SLinus Torvalds } 2125a257cdd0SAndreas Gruenbacher 2126a257cdd0SAndreas Gruenbacher #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 2127a257cdd0SAndreas Gruenbacher struct posix_acl * 2128a257cdd0SAndreas Gruenbacher nfsd_get_posix_acl(struct svc_fh *fhp, int type) 2129a257cdd0SAndreas Gruenbacher { 2130a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2131a257cdd0SAndreas Gruenbacher char *name; 2132a257cdd0SAndreas Gruenbacher void *value = NULL; 2133a257cdd0SAndreas Gruenbacher ssize_t size; 2134a257cdd0SAndreas Gruenbacher struct posix_acl *acl; 2135a257cdd0SAndreas Gruenbacher 21365be196e5SChristoph Hellwig if (!IS_POSIXACL(inode)) 2137a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 21385be196e5SChristoph Hellwig 2139a257cdd0SAndreas Gruenbacher switch (type) { 2140a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2141334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2142a257cdd0SAndreas Gruenbacher break; 2143a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2144334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2145a257cdd0SAndreas Gruenbacher break; 2146a257cdd0SAndreas Gruenbacher default: 2147a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 2148a257cdd0SAndreas Gruenbacher } 2149a257cdd0SAndreas Gruenbacher 21505be196e5SChristoph Hellwig size = nfsd_getxattr(fhp->fh_dentry, name, &value); 21515be196e5SChristoph Hellwig if (size < 0) 21525be196e5SChristoph Hellwig return ERR_PTR(size); 2153a257cdd0SAndreas Gruenbacher 2154a257cdd0SAndreas Gruenbacher acl = posix_acl_from_xattr(value, size); 2155a257cdd0SAndreas Gruenbacher kfree(value); 2156a257cdd0SAndreas Gruenbacher return acl; 2157a257cdd0SAndreas Gruenbacher } 2158a257cdd0SAndreas Gruenbacher 2159a257cdd0SAndreas Gruenbacher int 2160a257cdd0SAndreas Gruenbacher nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) 2161a257cdd0SAndreas Gruenbacher { 2162a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2163a257cdd0SAndreas Gruenbacher char *name; 2164a257cdd0SAndreas Gruenbacher void *value = NULL; 2165a257cdd0SAndreas Gruenbacher size_t size; 2166a257cdd0SAndreas Gruenbacher int error; 2167a257cdd0SAndreas Gruenbacher 2168a257cdd0SAndreas Gruenbacher if (!IS_POSIXACL(inode) || !inode->i_op || 2169a257cdd0SAndreas Gruenbacher !inode->i_op->setxattr || !inode->i_op->removexattr) 2170a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2171a257cdd0SAndreas Gruenbacher switch(type) { 2172a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2173334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2174a257cdd0SAndreas Gruenbacher break; 2175a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2176334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2177a257cdd0SAndreas Gruenbacher break; 2178a257cdd0SAndreas Gruenbacher default: 2179a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2180a257cdd0SAndreas Gruenbacher } 2181a257cdd0SAndreas Gruenbacher 2182a257cdd0SAndreas Gruenbacher if (acl && acl->a_count) { 2183334a13ecSChristoph Hellwig size = posix_acl_xattr_size(acl->a_count); 2184a257cdd0SAndreas Gruenbacher value = kmalloc(size, GFP_KERNEL); 2185a257cdd0SAndreas Gruenbacher if (!value) 2186a257cdd0SAndreas Gruenbacher return -ENOMEM; 21879ccfc29cSFlorin Malita error = posix_acl_to_xattr(acl, value, size); 21889ccfc29cSFlorin Malita if (error < 0) 2189a257cdd0SAndreas Gruenbacher goto getout; 21909ccfc29cSFlorin Malita size = error; 2191a257cdd0SAndreas Gruenbacher } else 2192a257cdd0SAndreas Gruenbacher size = 0; 2193a257cdd0SAndreas Gruenbacher 219418f335afSDave Hansen error = mnt_want_write(fhp->fh_export->ex_path.mnt); 219518f335afSDave Hansen if (error) 219618f335afSDave Hansen goto getout; 2197a257cdd0SAndreas Gruenbacher if (size) 21985be196e5SChristoph Hellwig error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); 2199a257cdd0SAndreas Gruenbacher else { 2200a257cdd0SAndreas Gruenbacher if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) 2201a257cdd0SAndreas Gruenbacher error = 0; 2202a257cdd0SAndreas Gruenbacher else { 22035be196e5SChristoph Hellwig error = vfs_removexattr(fhp->fh_dentry, name); 2204a257cdd0SAndreas Gruenbacher if (error == -ENODATA) 2205a257cdd0SAndreas Gruenbacher error = 0; 2206a257cdd0SAndreas Gruenbacher } 2207a257cdd0SAndreas Gruenbacher } 220818f335afSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 2209a257cdd0SAndreas Gruenbacher 2210a257cdd0SAndreas Gruenbacher getout: 2211a257cdd0SAndreas Gruenbacher kfree(value); 2212a257cdd0SAndreas Gruenbacher return error; 2213a257cdd0SAndreas Gruenbacher } 2214a257cdd0SAndreas Gruenbacher #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ 2215