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> 261da177e4SLinus Torvalds #include <linux/ext2_fs.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 #define NFSD_PARANOIA 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds /* We must ignore files (but only files) which might have mandatory 661da177e4SLinus Torvalds * locks on them because there is no way to know if the accesser has 671da177e4SLinus Torvalds * the lock. 681da177e4SLinus Torvalds */ 691da177e4SLinus Torvalds #define IS_ISMNDLK(i) (S_ISREG((i)->i_mode) && MANDATORY_LOCK(i)) 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds /* 721da177e4SLinus Torvalds * This is a cache of readahead params that help us choose the proper 731da177e4SLinus Torvalds * readahead strategy. Initially, we set all readahead parameters to 0 741da177e4SLinus Torvalds * and let the VFS handle things. 751da177e4SLinus Torvalds * If you increase the number of cached files very much, you'll need to 761da177e4SLinus Torvalds * add a hash table here. 771da177e4SLinus Torvalds */ 781da177e4SLinus Torvalds struct raparms { 791da177e4SLinus Torvalds struct raparms *p_next; 801da177e4SLinus Torvalds unsigned int p_count; 811da177e4SLinus Torvalds ino_t p_ino; 821da177e4SLinus Torvalds dev_t p_dev; 831da177e4SLinus Torvalds int p_set; 841da177e4SLinus Torvalds struct file_ra_state p_ra; 85fce1456aSGreg Banks unsigned int p_hindex; 861da177e4SLinus Torvalds }; 871da177e4SLinus Torvalds 88fce1456aSGreg Banks struct raparm_hbucket { 89fce1456aSGreg Banks struct raparms *pb_head; 90fce1456aSGreg Banks spinlock_t pb_lock; 91fce1456aSGreg Banks } ____cacheline_aligned_in_smp; 92fce1456aSGreg Banks 931da177e4SLinus Torvalds static struct raparms * raparml; 94fce1456aSGreg Banks #define RAPARM_HASH_BITS 4 95fce1456aSGreg Banks #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) 96fce1456aSGreg Banks #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) 97fce1456aSGreg Banks static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds /* 1001da177e4SLinus Torvalds * Called from nfsd_lookup and encode_dirent. Check if we have crossed 1011da177e4SLinus Torvalds * a mount point. 102e0bb89efSJ.Bruce Fields * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, 1031da177e4SLinus Torvalds * or nfs_ok having possibly changed *dpp and *expp 1041da177e4SLinus Torvalds */ 1051da177e4SLinus Torvalds int 1061da177e4SLinus Torvalds nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 1071da177e4SLinus Torvalds struct svc_export **expp) 1081da177e4SLinus Torvalds { 1091da177e4SLinus Torvalds struct svc_export *exp = *expp, *exp2 = NULL; 1101da177e4SLinus Torvalds struct dentry *dentry = *dpp; 1111da177e4SLinus Torvalds struct vfsmount *mnt = mntget(exp->ex_mnt); 1121da177e4SLinus Torvalds struct dentry *mounts = dget(dentry); 1136264d69dSAl Viro int err = 0; 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts)); 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds exp2 = exp_get_by_name(exp->ex_client, mnt, mounts, &rqstp->rq_chandle); 1181da177e4SLinus Torvalds if (IS_ERR(exp2)) { 1191da177e4SLinus Torvalds err = PTR_ERR(exp2); 1201da177e4SLinus Torvalds dput(mounts); 1211da177e4SLinus Torvalds mntput(mnt); 1221da177e4SLinus Torvalds goto out; 1231da177e4SLinus Torvalds } 1241da177e4SLinus Torvalds if (exp2 && ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2))) { 1251da177e4SLinus Torvalds /* successfully crossed mount point */ 1261da177e4SLinus Torvalds exp_put(exp); 1271da177e4SLinus Torvalds *expp = exp2; 1281da177e4SLinus Torvalds dput(dentry); 1291da177e4SLinus Torvalds *dpp = mounts; 1301da177e4SLinus Torvalds } else { 1311da177e4SLinus Torvalds if (exp2) exp_put(exp2); 1321da177e4SLinus Torvalds dput(mounts); 1331da177e4SLinus Torvalds } 1341da177e4SLinus Torvalds mntput(mnt); 1351da177e4SLinus Torvalds out: 1361da177e4SLinus Torvalds return err; 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds /* 1401da177e4SLinus Torvalds * Look up one component of a pathname. 1411da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfh need an fh_put 1421da177e4SLinus Torvalds * 1431da177e4SLinus Torvalds * If the lookup would cross a mountpoint, and the mounted filesystem 1441da177e4SLinus Torvalds * is exported to the client with NFSEXP_NOHIDE, then the lookup is 1451da177e4SLinus Torvalds * accepted as it stands and the mounted directory is 1461da177e4SLinus Torvalds * returned. Otherwise the covered directory is returned. 1471da177e4SLinus Torvalds * NOTE: this mountpoint crossing is not supported properly by all 1481da177e4SLinus Torvalds * clients and is explicitly disallowed for NFSv3 1491da177e4SLinus Torvalds * NeilBrown <neilb@cse.unsw.edu.au> 1501da177e4SLinus Torvalds */ 1516264d69dSAl Viro __be32 1521da177e4SLinus Torvalds nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 1531da177e4SLinus Torvalds int len, struct svc_fh *resfh) 1541da177e4SLinus Torvalds { 1551da177e4SLinus Torvalds struct svc_export *exp; 1561da177e4SLinus Torvalds struct dentry *dparent; 1571da177e4SLinus Torvalds struct dentry *dentry; 1586264d69dSAl Viro __be32 err; 1596264d69dSAl Viro int host_err; 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds /* Obtain dentry and export. */ 1641da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC); 1651da177e4SLinus Torvalds if (err) 1661da177e4SLinus Torvalds return err; 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds dparent = fhp->fh_dentry; 1691da177e4SLinus Torvalds exp = fhp->fh_export; 1701da177e4SLinus Torvalds exp_get(exp); 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds err = nfserr_acces; 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds /* Lookup the name, but don't follow links */ 1751da177e4SLinus Torvalds if (isdotent(name, len)) { 1761da177e4SLinus Torvalds if (len==1) 1771da177e4SLinus Torvalds dentry = dget(dparent); 1781da177e4SLinus Torvalds else if (dparent != exp->ex_dentry) { 1791da177e4SLinus Torvalds dentry = dget_parent(dparent); 1801da177e4SLinus Torvalds } else if (!EX_NOHIDE(exp)) 1811da177e4SLinus Torvalds dentry = dget(dparent); /* .. == . just like at / */ 1821da177e4SLinus Torvalds else { 1831da177e4SLinus Torvalds /* checking mountpoint crossing is very different when stepping up */ 1841da177e4SLinus Torvalds struct svc_export *exp2 = NULL; 1851da177e4SLinus Torvalds struct dentry *dp; 1861da177e4SLinus Torvalds struct vfsmount *mnt = mntget(exp->ex_mnt); 1871da177e4SLinus Torvalds dentry = dget(dparent); 1881da177e4SLinus Torvalds while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry)) 1891da177e4SLinus Torvalds ; 1901da177e4SLinus Torvalds dp = dget_parent(dentry); 1911da177e4SLinus Torvalds dput(dentry); 1921da177e4SLinus Torvalds dentry = dp; 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds exp2 = exp_parent(exp->ex_client, mnt, dentry, 1951da177e4SLinus Torvalds &rqstp->rq_chandle); 1961da177e4SLinus Torvalds if (IS_ERR(exp2)) { 1976264d69dSAl Viro host_err = PTR_ERR(exp2); 1981da177e4SLinus Torvalds dput(dentry); 1991da177e4SLinus Torvalds mntput(mnt); 2001da177e4SLinus Torvalds goto out_nfserr; 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds if (!exp2) { 2031da177e4SLinus Torvalds dput(dentry); 2041da177e4SLinus Torvalds dentry = dget(dparent); 2051da177e4SLinus Torvalds } else { 2061da177e4SLinus Torvalds exp_put(exp); 2071da177e4SLinus Torvalds exp = exp2; 2081da177e4SLinus Torvalds } 2091da177e4SLinus Torvalds mntput(mnt); 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds } else { 2121da177e4SLinus Torvalds fh_lock(fhp); 2131da177e4SLinus Torvalds dentry = lookup_one_len(name, dparent, len); 2146264d69dSAl Viro host_err = PTR_ERR(dentry); 2151da177e4SLinus Torvalds if (IS_ERR(dentry)) 2161da177e4SLinus Torvalds goto out_nfserr; 2171da177e4SLinus Torvalds /* 2181da177e4SLinus Torvalds * check if we have crossed a mount point ... 2191da177e4SLinus Torvalds */ 2201da177e4SLinus Torvalds if (d_mountpoint(dentry)) { 2216264d69dSAl Viro if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 2221da177e4SLinus Torvalds dput(dentry); 2231da177e4SLinus Torvalds goto out_nfserr; 2241da177e4SLinus Torvalds } 2251da177e4SLinus Torvalds } 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds /* 2281da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2291da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2301da177e4SLinus Torvalds */ 2311da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2321da177e4SLinus Torvalds if (!err && !dentry->d_inode) 2331da177e4SLinus Torvalds err = nfserr_noent; 2341da177e4SLinus Torvalds dput(dentry); 2351da177e4SLinus Torvalds out: 2361da177e4SLinus Torvalds exp_put(exp); 2371da177e4SLinus Torvalds return err; 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds out_nfserr: 2406264d69dSAl Viro err = nfserrno(host_err); 2411da177e4SLinus Torvalds goto out; 2421da177e4SLinus Torvalds } 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds /* 2451da177e4SLinus Torvalds * Set various file attributes. 2461da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 2471da177e4SLinus Torvalds */ 2486264d69dSAl Viro __be32 2491da177e4SLinus Torvalds nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 2501da177e4SLinus Torvalds int check_guard, time_t guardtime) 2511da177e4SLinus Torvalds { 2521da177e4SLinus Torvalds struct dentry *dentry; 2531da177e4SLinus Torvalds struct inode *inode; 2541da177e4SLinus Torvalds int accmode = MAY_SATTR; 2551da177e4SLinus Torvalds int ftype = 0; 2561da177e4SLinus Torvalds int imode; 2576264d69dSAl Viro __be32 err; 2586264d69dSAl Viro int host_err; 2591da177e4SLinus Torvalds int size_change = 0; 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) 2621da177e4SLinus Torvalds accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE; 2631da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) 2641da177e4SLinus Torvalds ftype = S_IFREG; 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds /* Get inode */ 2671da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 26815b7a1b8SNeilBrown if (err) 2691da177e4SLinus Torvalds goto out; 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds dentry = fhp->fh_dentry; 2721da177e4SLinus Torvalds inode = dentry->d_inode; 2731da177e4SLinus Torvalds 27415b7a1b8SNeilBrown /* Ignore any mode updates on symlinks */ 27515b7a1b8SNeilBrown if (S_ISLNK(inode->i_mode)) 27615b7a1b8SNeilBrown iap->ia_valid &= ~ATTR_MODE; 27715b7a1b8SNeilBrown 27815b7a1b8SNeilBrown if (!iap->ia_valid) 27915b7a1b8SNeilBrown goto out; 28015b7a1b8SNeilBrown 2811da177e4SLinus Torvalds /* NFSv2 does not differentiate between "set-[ac]time-to-now" 2821da177e4SLinus Torvalds * which only requires access, and "set-[ac]time-to-X" which 2831da177e4SLinus Torvalds * requires ownership. 2841da177e4SLinus Torvalds * So if it looks like it might be "set both to the same time which 2851da177e4SLinus Torvalds * is close to now", and if inode_change_ok fails, then we 2861da177e4SLinus Torvalds * convert to "set to now" instead of "set to explicit time" 2871da177e4SLinus Torvalds * 2881da177e4SLinus Torvalds * We only call inode_change_ok as the last test as technically 2891da177e4SLinus Torvalds * it is not an interface that we should be using. It is only 2901da177e4SLinus Torvalds * valid if the filesystem does not define it's own i_op->setattr. 2911da177e4SLinus Torvalds */ 2921da177e4SLinus Torvalds #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) 2931da177e4SLinus Torvalds #define MAX_TOUCH_TIME_ERROR (30*60) 2941da177e4SLinus Torvalds if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET 2951da177e4SLinus Torvalds && iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec 2961da177e4SLinus Torvalds ) { 2971da177e4SLinus Torvalds /* Looks probable. Now just make sure time is in the right ballpark. 2981da177e4SLinus Torvalds * Solaris, at least, doesn't seem to care what the time request is. 2991da177e4SLinus Torvalds * We require it be within 30 minutes of now. 3001da177e4SLinus Torvalds */ 3011da177e4SLinus Torvalds time_t delta = iap->ia_atime.tv_sec - get_seconds(); 3021da177e4SLinus Torvalds if (delta<0) delta = -delta; 3031da177e4SLinus Torvalds if (delta < MAX_TOUCH_TIME_ERROR && 3041da177e4SLinus Torvalds inode_change_ok(inode, iap) != 0) { 3051da177e4SLinus Torvalds /* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME 3061da177e4SLinus Torvalds * this will cause notify_change to set these times to "now" 3071da177e4SLinus Torvalds */ 3081da177e4SLinus Torvalds iap->ia_valid &= ~BOTH_TIME_SET; 3091da177e4SLinus Torvalds } 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds /* The size case is special. It changes the file as well as the attributes. */ 3131da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) { 3141da177e4SLinus Torvalds if (iap->ia_size < inode->i_size) { 3151da177e4SLinus Torvalds err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE); 3161da177e4SLinus Torvalds if (err) 3171da177e4SLinus Torvalds goto out; 3181da177e4SLinus Torvalds } 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds /* 3211da177e4SLinus Torvalds * If we are changing the size of the file, then 3221da177e4SLinus Torvalds * we need to break all leases. 3231da177e4SLinus Torvalds */ 3246264d69dSAl Viro host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK); 3256264d69dSAl Viro if (host_err == -EWOULDBLOCK) 3266264d69dSAl Viro host_err = -ETIMEDOUT; 3276264d69dSAl Viro if (host_err) /* ENOMEM or EWOULDBLOCK */ 3281da177e4SLinus Torvalds goto out_nfserr; 3291da177e4SLinus Torvalds 3306264d69dSAl Viro host_err = get_write_access(inode); 3316264d69dSAl Viro if (host_err) 3321da177e4SLinus Torvalds goto out_nfserr; 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds size_change = 1; 3356264d69dSAl Viro host_err = locks_verify_truncate(inode, NULL, iap->ia_size); 3366264d69dSAl Viro if (host_err) { 3371da177e4SLinus Torvalds put_write_access(inode); 3381da177e4SLinus Torvalds goto out_nfserr; 3391da177e4SLinus Torvalds } 3401da177e4SLinus Torvalds DQUOT_INIT(inode); 3411da177e4SLinus Torvalds } 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds imode = inode->i_mode; 3441da177e4SLinus Torvalds if (iap->ia_valid & ATTR_MODE) { 3451da177e4SLinus Torvalds iap->ia_mode &= S_IALLUGO; 3461da177e4SLinus Torvalds imode = iap->ia_mode |= (imode & ~S_IALLUGO); 3471da177e4SLinus Torvalds } 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds /* Revoke setuid/setgid bit on chown/chgrp */ 3501da177e4SLinus Torvalds if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) 3511da177e4SLinus Torvalds iap->ia_valid |= ATTR_KILL_SUID; 3521da177e4SLinus Torvalds if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid) 3531da177e4SLinus Torvalds iap->ia_valid |= ATTR_KILL_SGID; 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds /* Change the attributes. */ 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds err = nfserr_notsync; 3601da177e4SLinus Torvalds if (!check_guard || guardtime == inode->i_ctime.tv_sec) { 3611da177e4SLinus Torvalds fh_lock(fhp); 3626264d69dSAl Viro host_err = notify_change(dentry, iap); 3636264d69dSAl Viro err = nfserrno(host_err); 3641da177e4SLinus Torvalds fh_unlock(fhp); 3651da177e4SLinus Torvalds } 3661da177e4SLinus Torvalds if (size_change) 3671da177e4SLinus Torvalds put_write_access(inode); 3681da177e4SLinus Torvalds if (!err) 3691da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 3701da177e4SLinus Torvalds write_inode_now(inode, 1); 3711da177e4SLinus Torvalds out: 3721da177e4SLinus Torvalds return err; 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvalds out_nfserr: 3756264d69dSAl Viro err = nfserrno(host_err); 3761da177e4SLinus Torvalds goto out; 3771da177e4SLinus Torvalds } 3781da177e4SLinus Torvalds 3795be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V2_ACL) || \ 3805be196e5SChristoph Hellwig defined(CONFIG_NFSD_V3_ACL) || \ 3815be196e5SChristoph Hellwig defined(CONFIG_NFSD_V4) 3825be196e5SChristoph Hellwig static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) 3835be196e5SChristoph Hellwig { 3845be196e5SChristoph Hellwig ssize_t buflen; 3851da177e4SLinus Torvalds 3865be196e5SChristoph Hellwig buflen = vfs_getxattr(dentry, key, NULL, 0); 3875be196e5SChristoph Hellwig if (buflen <= 0) 3885be196e5SChristoph Hellwig return buflen; 3895be196e5SChristoph Hellwig 3905be196e5SChristoph Hellwig *buf = kmalloc(buflen, GFP_KERNEL); 3915be196e5SChristoph Hellwig if (!*buf) 3925be196e5SChristoph Hellwig return -ENOMEM; 3935be196e5SChristoph Hellwig 394b5872b0dSNeilBrown return vfs_getxattr(dentry, key, *buf, buflen); 3955be196e5SChristoph Hellwig } 3965be196e5SChristoph Hellwig #endif 3975be196e5SChristoph Hellwig 3985be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V4) 3991da177e4SLinus Torvalds static int 4001da177e4SLinus Torvalds set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) 4011da177e4SLinus Torvalds { 4021da177e4SLinus Torvalds int len; 4031da177e4SLinus Torvalds size_t buflen; 4041da177e4SLinus Torvalds char *buf = NULL; 4051da177e4SLinus Torvalds int error = 0; 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds buflen = posix_acl_xattr_size(pacl->a_count); 4081da177e4SLinus Torvalds buf = kmalloc(buflen, GFP_KERNEL); 4091da177e4SLinus Torvalds error = -ENOMEM; 4101da177e4SLinus Torvalds if (buf == NULL) 4111da177e4SLinus Torvalds goto out; 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds len = posix_acl_to_xattr(pacl, buf, buflen); 4141da177e4SLinus Torvalds if (len < 0) { 4151da177e4SLinus Torvalds error = len; 4161da177e4SLinus Torvalds goto out; 4171da177e4SLinus Torvalds } 4181da177e4SLinus Torvalds 4195be196e5SChristoph Hellwig error = vfs_setxattr(dentry, key, buf, len, 0); 4201da177e4SLinus Torvalds out: 4211da177e4SLinus Torvalds kfree(buf); 4221da177e4SLinus Torvalds return error; 4231da177e4SLinus Torvalds } 4241da177e4SLinus Torvalds 4256264d69dSAl Viro __be32 4261da177e4SLinus Torvalds nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, 4271da177e4SLinus Torvalds struct nfs4_acl *acl) 4281da177e4SLinus Torvalds { 4296264d69dSAl Viro __be32 error; 4306264d69dSAl Viro int host_error; 4311da177e4SLinus Torvalds struct dentry *dentry; 4321da177e4SLinus Torvalds struct inode *inode; 4331da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 4341da177e4SLinus Torvalds unsigned int flags = 0; 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds /* Get inode */ 4371da177e4SLinus Torvalds error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR); 4381da177e4SLinus Torvalds if (error) 4391da177e4SLinus Torvalds goto out; 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds dentry = fhp->fh_dentry; 4421da177e4SLinus Torvalds inode = dentry->d_inode; 4431da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) 4441da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 4451da177e4SLinus Torvalds 4466264d69dSAl Viro host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); 4476264d69dSAl Viro if (host_error == -EINVAL) { 4481da177e4SLinus Torvalds error = nfserr_attrnotsupp; 4491da177e4SLinus Torvalds goto out; 4506264d69dSAl Viro } else if (host_error < 0) 4511da177e4SLinus Torvalds goto out_nfserr; 4521da177e4SLinus Torvalds 4536264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); 4546264d69dSAl Viro if (host_error < 0) 4551da177e4SLinus Torvalds goto out_nfserr; 4561da177e4SLinus Torvalds 457b66285ceSJ.Bruce Fields if (S_ISDIR(inode->i_mode)) { 4586264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); 4596264d69dSAl Viro if (host_error < 0) 4601da177e4SLinus Torvalds goto out_nfserr; 4611da177e4SLinus Torvalds } 4621da177e4SLinus Torvalds 4631da177e4SLinus Torvalds error = nfs_ok; 4641da177e4SLinus Torvalds 4651da177e4SLinus Torvalds out: 4661da177e4SLinus Torvalds posix_acl_release(pacl); 4671da177e4SLinus Torvalds posix_acl_release(dpacl); 4681da177e4SLinus Torvalds return (error); 4691da177e4SLinus Torvalds out_nfserr: 4706264d69dSAl Viro error = nfserrno(host_error); 4711da177e4SLinus Torvalds goto out; 4721da177e4SLinus Torvalds } 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds static struct posix_acl * 4751da177e4SLinus Torvalds _get_posix_acl(struct dentry *dentry, char *key) 4761da177e4SLinus Torvalds { 4775be196e5SChristoph Hellwig void *buf = NULL; 4781da177e4SLinus Torvalds struct posix_acl *pacl = NULL; 4795be196e5SChristoph Hellwig int buflen; 4801da177e4SLinus Torvalds 4815be196e5SChristoph Hellwig buflen = nfsd_getxattr(dentry, key, &buf); 4825be196e5SChristoph Hellwig if (!buflen) 4835be196e5SChristoph Hellwig buflen = -ENODATA; 4845be196e5SChristoph Hellwig if (buflen <= 0) 4855be196e5SChristoph Hellwig return ERR_PTR(buflen); 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds pacl = posix_acl_from_xattr(buf, buflen); 4881da177e4SLinus Torvalds kfree(buf); 4891da177e4SLinus Torvalds return pacl; 4901da177e4SLinus Torvalds } 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds int 4931da177e4SLinus Torvalds nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) 4941da177e4SLinus Torvalds { 4951da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 4961da177e4SLinus Torvalds int error = 0; 4971da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 4981da177e4SLinus Torvalds unsigned int flags = 0; 4991da177e4SLinus Torvalds 5009a59f452SChristoph Hellwig pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); 5011da177e4SLinus Torvalds if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) 5021da177e4SLinus Torvalds pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 5031da177e4SLinus Torvalds if (IS_ERR(pacl)) { 5041da177e4SLinus Torvalds error = PTR_ERR(pacl); 5051da177e4SLinus Torvalds pacl = NULL; 5061da177e4SLinus Torvalds goto out; 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) { 5109a59f452SChristoph Hellwig dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); 5111da177e4SLinus Torvalds if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) 5121da177e4SLinus Torvalds dpacl = NULL; 5131da177e4SLinus Torvalds else if (IS_ERR(dpacl)) { 5141da177e4SLinus Torvalds error = PTR_ERR(dpacl); 5151da177e4SLinus Torvalds dpacl = NULL; 5161da177e4SLinus Torvalds goto out; 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5191da177e4SLinus Torvalds } 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); 5221da177e4SLinus Torvalds if (IS_ERR(*acl)) { 5231da177e4SLinus Torvalds error = PTR_ERR(*acl); 5241da177e4SLinus Torvalds *acl = NULL; 5251da177e4SLinus Torvalds } 5261da177e4SLinus Torvalds out: 5271da177e4SLinus Torvalds posix_acl_release(pacl); 5281da177e4SLinus Torvalds posix_acl_release(dpacl); 5291da177e4SLinus Torvalds return error; 5301da177e4SLinus Torvalds } 5311da177e4SLinus Torvalds 5321da177e4SLinus Torvalds #endif /* defined(CONFIG_NFS_V4) */ 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 5351da177e4SLinus Torvalds /* 5361da177e4SLinus Torvalds * Check server access rights to a file system object 5371da177e4SLinus Torvalds */ 5381da177e4SLinus Torvalds struct accessmap { 5391da177e4SLinus Torvalds u32 access; 5401da177e4SLinus Torvalds int how; 5411da177e4SLinus Torvalds }; 5421da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 5431da177e4SLinus Torvalds { NFS3_ACCESS_READ, MAY_READ }, 5441da177e4SLinus Torvalds { NFS3_ACCESS_EXECUTE, MAY_EXEC }, 5451da177e4SLinus Torvalds { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_TRUNC }, 5461da177e4SLinus Torvalds { NFS3_ACCESS_EXTEND, MAY_WRITE }, 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds { 0, 0 } 5491da177e4SLinus Torvalds }; 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 5521da177e4SLinus Torvalds { NFS3_ACCESS_READ, MAY_READ }, 5531da177e4SLinus Torvalds { NFS3_ACCESS_LOOKUP, MAY_EXEC }, 5541da177e4SLinus Torvalds { NFS3_ACCESS_MODIFY, MAY_EXEC|MAY_WRITE|MAY_TRUNC }, 5551da177e4SLinus Torvalds { NFS3_ACCESS_EXTEND, MAY_EXEC|MAY_WRITE }, 5561da177e4SLinus Torvalds { NFS3_ACCESS_DELETE, MAY_REMOVE }, 5571da177e4SLinus Torvalds 5581da177e4SLinus Torvalds { 0, 0 } 5591da177e4SLinus Torvalds }; 5601da177e4SLinus Torvalds 5611da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 5621da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 5631da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 5641da177e4SLinus Torvalds * (which really, the server doesn't care about). So 5651da177e4SLinus Torvalds * We provide simple access checking for them, looking 5661da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 5671da177e4SLinus Torvalds * filesystem checks 5681da177e4SLinus Torvalds */ 5691da177e4SLinus Torvalds { NFS3_ACCESS_READ, MAY_READ }, 5701da177e4SLinus Torvalds { NFS3_ACCESS_EXECUTE, MAY_EXEC }, 5711da177e4SLinus Torvalds { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_LOCAL_ACCESS }, 5721da177e4SLinus Torvalds { NFS3_ACCESS_EXTEND, MAY_WRITE|MAY_LOCAL_ACCESS }, 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds { 0, 0 } 5751da177e4SLinus Torvalds }; 5761da177e4SLinus Torvalds 5776264d69dSAl Viro __be32 5781da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 5791da177e4SLinus Torvalds { 5801da177e4SLinus Torvalds struct accessmap *map; 5811da177e4SLinus Torvalds struct svc_export *export; 5821da177e4SLinus Torvalds struct dentry *dentry; 5831da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 5846264d69dSAl Viro __be32 error; 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds error = fh_verify(rqstp, fhp, 0, MAY_NOP); 5871da177e4SLinus Torvalds if (error) 5881da177e4SLinus Torvalds goto out; 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds export = fhp->fh_export; 5911da177e4SLinus Torvalds dentry = fhp->fh_dentry; 5921da177e4SLinus Torvalds 5931da177e4SLinus Torvalds if (S_ISREG(dentry->d_inode->i_mode)) 5941da177e4SLinus Torvalds map = nfs3_regaccess; 5951da177e4SLinus Torvalds else if (S_ISDIR(dentry->d_inode->i_mode)) 5961da177e4SLinus Torvalds map = nfs3_diraccess; 5971da177e4SLinus Torvalds else 5981da177e4SLinus Torvalds map = nfs3_anyaccess; 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds query = *access; 6021da177e4SLinus Torvalds for (; map->access; map++) { 6031da177e4SLinus Torvalds if (map->access & query) { 6046264d69dSAl Viro __be32 err2; 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds sresult |= map->access; 6071da177e4SLinus Torvalds 6081da177e4SLinus Torvalds err2 = nfsd_permission(export, dentry, map->how); 6091da177e4SLinus Torvalds switch (err2) { 6101da177e4SLinus Torvalds case nfs_ok: 6111da177e4SLinus Torvalds result |= map->access; 6121da177e4SLinus Torvalds break; 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 6151da177e4SLinus Torvalds * rather than an error occurred */ 6161da177e4SLinus Torvalds case nfserr_rofs: 6171da177e4SLinus Torvalds case nfserr_acces: 6181da177e4SLinus Torvalds case nfserr_perm: 6191da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 6201da177e4SLinus Torvalds break; 6211da177e4SLinus Torvalds default: 6221da177e4SLinus Torvalds error = err2; 6231da177e4SLinus Torvalds goto out; 6241da177e4SLinus Torvalds } 6251da177e4SLinus Torvalds } 6261da177e4SLinus Torvalds } 6271da177e4SLinus Torvalds *access = result; 6281da177e4SLinus Torvalds if (supported) 6291da177e4SLinus Torvalds *supported = sresult; 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds out: 6321da177e4SLinus Torvalds return error; 6331da177e4SLinus Torvalds } 6341da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds 6381da177e4SLinus Torvalds /* 6391da177e4SLinus Torvalds * Open an existing file or directory. 6401da177e4SLinus Torvalds * The access argument indicates the type of open (read/write/lock) 6411da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 6421da177e4SLinus Torvalds */ 6436264d69dSAl Viro __be32 6441da177e4SLinus Torvalds nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 6451da177e4SLinus Torvalds int access, struct file **filp) 6461da177e4SLinus Torvalds { 6471da177e4SLinus Torvalds struct dentry *dentry; 6481da177e4SLinus Torvalds struct inode *inode; 6496264d69dSAl Viro int flags = O_RDONLY|O_LARGEFILE; 6506264d69dSAl Viro __be32 err; 6516264d69dSAl Viro int host_err; 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds /* 6541da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 6551da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 6561da177e4SLinus Torvalds * in case a chmod has now revoked permission. 6571da177e4SLinus Torvalds */ 6581da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE); 6591da177e4SLinus Torvalds if (err) 6601da177e4SLinus Torvalds goto out; 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6631da177e4SLinus Torvalds inode = dentry->d_inode; 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 6661da177e4SLinus Torvalds * or any access when mandatory locking enabled 6671da177e4SLinus Torvalds */ 6681da177e4SLinus Torvalds err = nfserr_perm; 6691da177e4SLinus Torvalds if (IS_APPEND(inode) && (access & MAY_WRITE)) 6701da177e4SLinus Torvalds goto out; 6711da177e4SLinus Torvalds if (IS_ISMNDLK(inode)) 6721da177e4SLinus Torvalds goto out; 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds if (!inode->i_fop) 6751da177e4SLinus Torvalds goto out; 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds /* 6781da177e4SLinus Torvalds * Check to see if there are any leases on this file. 6791da177e4SLinus Torvalds * This may block while leases are broken. 6801da177e4SLinus Torvalds */ 6816264d69dSAl Viro host_err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0)); 6826264d69dSAl Viro if (host_err == -EWOULDBLOCK) 6836264d69dSAl Viro host_err = -ETIMEDOUT; 6846264d69dSAl Viro if (host_err) /* NOMEM or WOULDBLOCK */ 6851da177e4SLinus Torvalds goto out_nfserr; 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds if (access & MAY_WRITE) { 6889ecb6a08SJ. Bruce Fields if (access & MAY_READ) 6899ecb6a08SJ. Bruce Fields flags = O_RDWR|O_LARGEFILE; 6909ecb6a08SJ. Bruce Fields else 6911da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 6921da177e4SLinus Torvalds 6931da177e4SLinus Torvalds DQUOT_INIT(inode); 6941da177e4SLinus Torvalds } 6951da177e4SLinus Torvalds *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags); 6961da177e4SLinus Torvalds if (IS_ERR(*filp)) 6976264d69dSAl Viro host_err = PTR_ERR(*filp); 6981da177e4SLinus Torvalds out_nfserr: 6996264d69dSAl Viro err = nfserrno(host_err); 7001da177e4SLinus Torvalds out: 7011da177e4SLinus Torvalds return err; 7021da177e4SLinus Torvalds } 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds /* 7051da177e4SLinus Torvalds * Close a file. 7061da177e4SLinus Torvalds */ 7071da177e4SLinus Torvalds void 7081da177e4SLinus Torvalds nfsd_close(struct file *filp) 7091da177e4SLinus Torvalds { 7101da177e4SLinus Torvalds fput(filp); 7111da177e4SLinus Torvalds } 7121da177e4SLinus Torvalds 7131da177e4SLinus Torvalds /* 7141da177e4SLinus Torvalds * Sync a file 7151da177e4SLinus Torvalds * As this calls fsync (not fdatasync) there is no need for a write_inode 7161da177e4SLinus Torvalds * after it. 7171da177e4SLinus Torvalds */ 718a334de28SDavid Shaw static inline int nfsd_dosync(struct file *filp, struct dentry *dp, 71999ac48f5SArjan van de Ven const struct file_operations *fop) 7201da177e4SLinus Torvalds { 7211da177e4SLinus Torvalds struct inode *inode = dp->d_inode; 7221da177e4SLinus Torvalds int (*fsync) (struct file *, struct dentry *, int); 723f193fbabSYAMAMOTO Takashi int err; 7241da177e4SLinus Torvalds 725f193fbabSYAMAMOTO Takashi err = filemap_fdatawrite(inode->i_mapping); 726f193fbabSYAMAMOTO Takashi if (err == 0 && fop && (fsync = fop->fsync)) 727a334de28SDavid Shaw err = fsync(filp, dp, 0); 728f193fbabSYAMAMOTO Takashi if (err == 0) 729f193fbabSYAMAMOTO Takashi err = filemap_fdatawait(inode->i_mapping); 730a334de28SDavid Shaw 731f193fbabSYAMAMOTO Takashi return err; 7321da177e4SLinus Torvalds } 7331da177e4SLinus Torvalds 7341da177e4SLinus Torvalds 735a334de28SDavid Shaw static int 7361da177e4SLinus Torvalds nfsd_sync(struct file *filp) 7371da177e4SLinus Torvalds { 738a334de28SDavid Shaw int err; 7397eaa36e2SJosef "Jeff" Sipek struct inode *inode = filp->f_path.dentry->d_inode; 7407eaa36e2SJosef "Jeff" Sipek dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name); 7411b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 7427eaa36e2SJosef "Jeff" Sipek err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op); 7431b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 744a334de28SDavid Shaw 745a334de28SDavid Shaw return err; 7461da177e4SLinus Torvalds } 7471da177e4SLinus Torvalds 748f193fbabSYAMAMOTO Takashi int 7491da177e4SLinus Torvalds nfsd_sync_dir(struct dentry *dp) 7501da177e4SLinus Torvalds { 751f193fbabSYAMAMOTO Takashi return nfsd_dosync(NULL, dp, dp->d_inode->i_fop); 7521da177e4SLinus Torvalds } 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds /* 7551da177e4SLinus Torvalds * Obtain the readahead parameters for the file 7561da177e4SLinus Torvalds * specified by (dev, ino). 7571da177e4SLinus Torvalds */ 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds static inline struct raparms * 7601da177e4SLinus Torvalds nfsd_get_raparms(dev_t dev, ino_t ino) 7611da177e4SLinus Torvalds { 7621da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 7631da177e4SLinus Torvalds int depth = 0; 764fce1456aSGreg Banks unsigned int hash; 765fce1456aSGreg Banks struct raparm_hbucket *rab; 7661da177e4SLinus Torvalds 767fce1456aSGreg Banks hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; 768fce1456aSGreg Banks rab = &raparm_hash[hash]; 769fce1456aSGreg Banks 770fce1456aSGreg Banks spin_lock(&rab->pb_lock); 771fce1456aSGreg Banks for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { 7721da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 7731da177e4SLinus Torvalds goto found; 7741da177e4SLinus Torvalds depth++; 7751da177e4SLinus Torvalds if (ra->p_count == 0) 7761da177e4SLinus Torvalds frap = rap; 7771da177e4SLinus Torvalds } 7781da177e4SLinus Torvalds depth = nfsdstats.ra_size*11/10; 7791da177e4SLinus Torvalds if (!frap) { 780fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 7811da177e4SLinus Torvalds return NULL; 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds rap = frap; 7841da177e4SLinus Torvalds ra = *frap; 7851da177e4SLinus Torvalds ra->p_dev = dev; 7861da177e4SLinus Torvalds ra->p_ino = ino; 7871da177e4SLinus Torvalds ra->p_set = 0; 788fce1456aSGreg Banks ra->p_hindex = hash; 7891da177e4SLinus Torvalds found: 790fce1456aSGreg Banks if (rap != &rab->pb_head) { 7911da177e4SLinus Torvalds *rap = ra->p_next; 792fce1456aSGreg Banks ra->p_next = rab->pb_head; 793fce1456aSGreg Banks rab->pb_head = ra; 7941da177e4SLinus Torvalds } 7951da177e4SLinus Torvalds ra->p_count++; 7961da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 797fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 7981da177e4SLinus Torvalds return ra; 7991da177e4SLinus Torvalds } 8001da177e4SLinus Torvalds 8011da177e4SLinus Torvalds /* 8021da177e4SLinus Torvalds * Grab and keep cached pages assosiated with a file in the svc_rqst 8031da177e4SLinus Torvalds * so that they can be passed to the netowork sendmsg/sendpage routines 8041da177e4SLinus Torvalds * directrly. They will be released after the sending has completed. 8051da177e4SLinus Torvalds */ 8061da177e4SLinus Torvalds static int 8071da177e4SLinus Torvalds nfsd_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset , unsigned long size) 8081da177e4SLinus Torvalds { 8091da177e4SLinus Torvalds unsigned long count = desc->count; 8101da177e4SLinus Torvalds struct svc_rqst *rqstp = desc->arg.data; 81144524359SNeilBrown struct page **pp = rqstp->rq_respages + rqstp->rq_resused; 8121da177e4SLinus Torvalds 8131da177e4SLinus Torvalds if (size > count) 8141da177e4SLinus Torvalds size = count; 8151da177e4SLinus Torvalds 8161da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 8171da177e4SLinus Torvalds get_page(page); 81844524359SNeilBrown put_page(*pp); 81944524359SNeilBrown *pp = page; 82044524359SNeilBrown rqstp->rq_resused++; 8211da177e4SLinus Torvalds rqstp->rq_res.page_base = offset; 8221da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 82344524359SNeilBrown } else if (page != pp[-1]) { 8241da177e4SLinus Torvalds get_page(page); 825250f3915SNeilBrown if (*pp) 82644524359SNeilBrown put_page(*pp); 82744524359SNeilBrown *pp = page; 82844524359SNeilBrown rqstp->rq_resused++; 8291da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 83044524359SNeilBrown } else 8311da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8321da177e4SLinus Torvalds 8331da177e4SLinus Torvalds desc->count = count - size; 8341da177e4SLinus Torvalds desc->written += size; 8351da177e4SLinus Torvalds return size; 8361da177e4SLinus Torvalds } 8371da177e4SLinus Torvalds 8386264d69dSAl Viro static __be32 8391da177e4SLinus Torvalds nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 8401da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 8411da177e4SLinus Torvalds { 8421da177e4SLinus Torvalds struct inode *inode; 8431da177e4SLinus Torvalds struct raparms *ra; 8441da177e4SLinus Torvalds mm_segment_t oldfs; 8456264d69dSAl Viro __be32 err; 8466264d69dSAl Viro int host_err; 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds err = nfserr_perm; 8497eaa36e2SJosef "Jeff" Sipek inode = file->f_path.dentry->d_inode; 8501da177e4SLinus Torvalds #ifdef MSNFS 8511da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 8521da177e4SLinus Torvalds (!lock_may_read(inode, offset, *count))) 8531da177e4SLinus Torvalds goto out; 8541da177e4SLinus Torvalds #endif 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds /* Get readahead parameters */ 8571da177e4SLinus Torvalds ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); 8581da177e4SLinus Torvalds 8591da177e4SLinus Torvalds if (ra && ra->p_set) 8601da177e4SLinus Torvalds file->f_ra = ra->p_ra; 8611da177e4SLinus Torvalds 8625c04c46aSJ. Bruce Fields if (file->f_op->sendfile && rqstp->rq_sendfile_ok) { 86344524359SNeilBrown rqstp->rq_resused = 1; 8646264d69dSAl Viro host_err = file->f_op->sendfile(file, &offset, *count, 8651da177e4SLinus Torvalds nfsd_read_actor, rqstp); 8661da177e4SLinus Torvalds } else { 8671da177e4SLinus Torvalds oldfs = get_fs(); 8681da177e4SLinus Torvalds set_fs(KERNEL_DS); 8696264d69dSAl Viro host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); 8701da177e4SLinus Torvalds set_fs(oldfs); 8711da177e4SLinus Torvalds } 8721da177e4SLinus Torvalds 8731da177e4SLinus Torvalds /* Write back readahead params */ 8741da177e4SLinus Torvalds if (ra) { 875fce1456aSGreg Banks struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; 876fce1456aSGreg Banks spin_lock(&rab->pb_lock); 8771da177e4SLinus Torvalds ra->p_ra = file->f_ra; 8781da177e4SLinus Torvalds ra->p_set = 1; 8791da177e4SLinus Torvalds ra->p_count--; 880fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8811da177e4SLinus Torvalds } 8821da177e4SLinus Torvalds 8836264d69dSAl Viro if (host_err >= 0) { 8846264d69dSAl Viro nfsdstats.io_read += host_err; 8856264d69dSAl Viro *count = host_err; 8861da177e4SLinus Torvalds err = 0; 8877eaa36e2SJosef "Jeff" Sipek fsnotify_access(file->f_path.dentry); 8881da177e4SLinus Torvalds } else 8896264d69dSAl Viro err = nfserrno(host_err); 8901da177e4SLinus Torvalds out: 8911da177e4SLinus Torvalds return err; 8921da177e4SLinus Torvalds } 8931da177e4SLinus Torvalds 8949f708e40SNeil Brown static void kill_suid(struct dentry *dentry) 8959f708e40SNeil Brown { 8969f708e40SNeil Brown struct iattr ia; 8979f708e40SNeil Brown ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID; 8989f708e40SNeil Brown 8991b1dcc1bSJes Sorensen mutex_lock(&dentry->d_inode->i_mutex); 9009f708e40SNeil Brown notify_change(dentry, &ia); 9011b1dcc1bSJes Sorensen mutex_unlock(&dentry->d_inode->i_mutex); 9029f708e40SNeil Brown } 9039f708e40SNeil Brown 9046264d69dSAl Viro static __be32 9051da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 9061da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 9071da177e4SLinus Torvalds unsigned long cnt, int *stablep) 9081da177e4SLinus Torvalds { 9091da177e4SLinus Torvalds struct svc_export *exp; 9101da177e4SLinus Torvalds struct dentry *dentry; 9111da177e4SLinus Torvalds struct inode *inode; 9121da177e4SLinus Torvalds mm_segment_t oldfs; 9136264d69dSAl Viro __be32 err = 0; 9146264d69dSAl Viro int host_err; 9151da177e4SLinus Torvalds int stable = *stablep; 9161da177e4SLinus Torvalds 91745bd3b3dSNeilBrown #ifdef MSNFS 9181da177e4SLinus Torvalds err = nfserr_perm; 9191da177e4SLinus Torvalds 9201da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 9217eaa36e2SJosef "Jeff" Sipek (!lock_may_write(file->f_path.dentry->d_inode, offset, cnt))) 9221da177e4SLinus Torvalds goto out; 9231da177e4SLinus Torvalds #endif 9241da177e4SLinus Torvalds 9257eaa36e2SJosef "Jeff" Sipek dentry = file->f_path.dentry; 9261da177e4SLinus Torvalds inode = dentry->d_inode; 9271da177e4SLinus Torvalds exp = fhp->fh_export; 9281da177e4SLinus Torvalds 9291da177e4SLinus Torvalds /* 9301da177e4SLinus Torvalds * Request sync writes if 9311da177e4SLinus Torvalds * - the sync export option has been set, or 9321da177e4SLinus Torvalds * - the client requested O_SYNC behavior (NFSv3 feature). 9331da177e4SLinus Torvalds * - The file system doesn't support fsync(). 9341da177e4SLinus Torvalds * When gathered writes have been configured for this volume, 9351da177e4SLinus Torvalds * flushing the data to disk is handled separately below. 9361da177e4SLinus Torvalds */ 9371da177e4SLinus Torvalds 9381da177e4SLinus Torvalds if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */ 9391da177e4SLinus Torvalds stable = 2; 9401da177e4SLinus Torvalds *stablep = 2; /* FILE_SYNC */ 9411da177e4SLinus Torvalds } 9421da177e4SLinus Torvalds 9431da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 9441da177e4SLinus Torvalds stable = 0; 9451da177e4SLinus Torvalds if (stable && !EX_WGATHER(exp)) 9461da177e4SLinus Torvalds file->f_flags |= O_SYNC; 9471da177e4SLinus Torvalds 9481da177e4SLinus Torvalds /* Write the data. */ 9491da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 9506264d69dSAl Viro host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); 9511da177e4SLinus Torvalds set_fs(oldfs); 9526264d69dSAl Viro if (host_err >= 0) { 9531da177e4SLinus Torvalds nfsdstats.io_write += cnt; 9547eaa36e2SJosef "Jeff" Sipek fsnotify_modify(file->f_path.dentry); 9551da177e4SLinus Torvalds } 9561da177e4SLinus Torvalds 9571da177e4SLinus Torvalds /* clear setuid/setgid flag after write */ 9586264d69dSAl Viro if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) 9599f708e40SNeil Brown kill_suid(dentry); 9601da177e4SLinus Torvalds 9616264d69dSAl Viro if (host_err >= 0 && stable) { 9621da177e4SLinus Torvalds static ino_t last_ino; 9631da177e4SLinus Torvalds static dev_t last_dev; 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds /* 9661da177e4SLinus Torvalds * Gathered writes: If another process is currently 9671da177e4SLinus Torvalds * writing to the file, there's a high chance 9681da177e4SLinus Torvalds * this is another nfsd (triggered by a bulk write 9691da177e4SLinus Torvalds * from a client's biod). Rather than syncing the 9701da177e4SLinus Torvalds * file with each write request, we sleep for 10 msec. 9711da177e4SLinus Torvalds * 9721da177e4SLinus Torvalds * I don't know if this roughly approximates 9731da177e4SLinus Torvalds * C. Juszak's idea of gathered writes, but it's a 9741da177e4SLinus Torvalds * nice and simple solution (IMHO), and it seems to 9751da177e4SLinus Torvalds * work:-) 9761da177e4SLinus Torvalds */ 9771da177e4SLinus Torvalds if (EX_WGATHER(exp)) { 9781da177e4SLinus Torvalds if (atomic_read(&inode->i_writecount) > 1 9791da177e4SLinus Torvalds || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 9801da177e4SLinus Torvalds dprintk("nfsd: write defer %d\n", current->pid); 9811da177e4SLinus Torvalds msleep(10); 9821da177e4SLinus Torvalds dprintk("nfsd: write resume %d\n", current->pid); 9831da177e4SLinus Torvalds } 9841da177e4SLinus Torvalds 9851da177e4SLinus Torvalds if (inode->i_state & I_DIRTY) { 9861da177e4SLinus Torvalds dprintk("nfsd: write sync %d\n", current->pid); 9876264d69dSAl Viro host_err=nfsd_sync(file); 9881da177e4SLinus Torvalds } 9891da177e4SLinus Torvalds #if 0 9901da177e4SLinus Torvalds wake_up(&inode->i_wait); 9911da177e4SLinus Torvalds #endif 9921da177e4SLinus Torvalds } 9931da177e4SLinus Torvalds last_ino = inode->i_ino; 9941da177e4SLinus Torvalds last_dev = inode->i_sb->s_dev; 9951da177e4SLinus Torvalds } 9961da177e4SLinus Torvalds 9976264d69dSAl Viro dprintk("nfsd: write complete host_err=%d\n", host_err); 9986264d69dSAl Viro if (host_err >= 0) 9991da177e4SLinus Torvalds err = 0; 10001da177e4SLinus Torvalds else 10016264d69dSAl Viro err = nfserrno(host_err); 10021da177e4SLinus Torvalds out: 10031da177e4SLinus Torvalds return err; 10041da177e4SLinus Torvalds } 10051da177e4SLinus Torvalds 10061da177e4SLinus Torvalds /* 10071da177e4SLinus Torvalds * Read data from a file. count must contain the requested read count 10081da177e4SLinus Torvalds * on entry. On return, *count contains the number of bytes actually read. 10091da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10101da177e4SLinus Torvalds */ 10116264d69dSAl Viro __be32 10121da177e4SLinus Torvalds nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10131da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 10141da177e4SLinus Torvalds unsigned long *count) 10151da177e4SLinus Torvalds { 10166264d69dSAl Viro __be32 err; 10171da177e4SLinus Torvalds 10181da177e4SLinus Torvalds if (file) { 10191da177e4SLinus Torvalds err = nfsd_permission(fhp->fh_export, fhp->fh_dentry, 10201da177e4SLinus Torvalds MAY_READ|MAY_OWNER_OVERRIDE); 10211da177e4SLinus Torvalds if (err) 10221da177e4SLinus Torvalds goto out; 10231da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 10241da177e4SLinus Torvalds } else { 10251da177e4SLinus Torvalds err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file); 10261da177e4SLinus Torvalds if (err) 10271da177e4SLinus Torvalds goto out; 10281da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 10291da177e4SLinus Torvalds nfsd_close(file); 10301da177e4SLinus Torvalds } 10311da177e4SLinus Torvalds out: 10321da177e4SLinus Torvalds return err; 10331da177e4SLinus Torvalds } 10341da177e4SLinus Torvalds 10351da177e4SLinus Torvalds /* 10361da177e4SLinus Torvalds * Write data to a file. 10371da177e4SLinus Torvalds * The stable flag requests synchronous writes. 10381da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10391da177e4SLinus Torvalds */ 10406264d69dSAl Viro __be32 10411da177e4SLinus Torvalds nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10421da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long cnt, 10431da177e4SLinus Torvalds int *stablep) 10441da177e4SLinus Torvalds { 10456264d69dSAl Viro __be32 err = 0; 10461da177e4SLinus Torvalds 10471da177e4SLinus Torvalds if (file) { 10481da177e4SLinus Torvalds err = nfsd_permission(fhp->fh_export, fhp->fh_dentry, 10491da177e4SLinus Torvalds MAY_WRITE|MAY_OWNER_OVERRIDE); 10501da177e4SLinus Torvalds if (err) 10511da177e4SLinus Torvalds goto out; 10521da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, 10531da177e4SLinus Torvalds stablep); 10541da177e4SLinus Torvalds } else { 10551da177e4SLinus Torvalds err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file); 10561da177e4SLinus Torvalds if (err) 10571da177e4SLinus Torvalds goto out; 10581da177e4SLinus Torvalds 10591da177e4SLinus Torvalds if (cnt) 10601da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, 10611da177e4SLinus Torvalds cnt, stablep); 10621da177e4SLinus Torvalds nfsd_close(file); 10631da177e4SLinus Torvalds } 10641da177e4SLinus Torvalds out: 10651da177e4SLinus Torvalds return err; 10661da177e4SLinus Torvalds } 10671da177e4SLinus Torvalds 10681da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 10691da177e4SLinus Torvalds /* 10701da177e4SLinus Torvalds * Commit all pending writes to stable storage. 10711da177e4SLinus Torvalds * Strictly speaking, we could sync just the indicated file region here, 10721da177e4SLinus Torvalds * but there's currently no way we can ask the VFS to do so. 10731da177e4SLinus Torvalds * 10741da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 10751da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 10761da177e4SLinus Torvalds */ 10776264d69dSAl Viro __be32 10781da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 10791da177e4SLinus Torvalds loff_t offset, unsigned long count) 10801da177e4SLinus Torvalds { 10811da177e4SLinus Torvalds struct file *file; 10826264d69dSAl Viro __be32 err; 10831da177e4SLinus Torvalds 10841da177e4SLinus Torvalds if ((u64)count > ~(u64)offset) 10851da177e4SLinus Torvalds return nfserr_inval; 10861da177e4SLinus Torvalds 10871da177e4SLinus Torvalds if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0) 10881da177e4SLinus Torvalds return err; 10891da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 10901da177e4SLinus Torvalds if (file->f_op && file->f_op->fsync) { 109145bd3b3dSNeilBrown err = nfserrno(nfsd_sync(file)); 10921da177e4SLinus Torvalds } else { 10931da177e4SLinus Torvalds err = nfserr_notsupp; 10941da177e4SLinus Torvalds } 10951da177e4SLinus Torvalds } 10961da177e4SLinus Torvalds 10971da177e4SLinus Torvalds nfsd_close(file); 10981da177e4SLinus Torvalds return err; 10991da177e4SLinus Torvalds } 11001da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 11011da177e4SLinus Torvalds 11021da177e4SLinus Torvalds /* 11031da177e4SLinus Torvalds * Create a file (regular, directory, device, fifo); UNIX sockets 11041da177e4SLinus Torvalds * not yet implemented. 11051da177e4SLinus Torvalds * If the response fh has been verified, the parent directory should 11061da177e4SLinus Torvalds * already be locked. Note that the parent directory is left locked. 11071da177e4SLinus Torvalds * 11081da177e4SLinus Torvalds * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 11091da177e4SLinus Torvalds */ 11106264d69dSAl Viro __be32 11111da177e4SLinus Torvalds nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 11121da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 11131da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 11141da177e4SLinus Torvalds { 11151da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 11161da177e4SLinus Torvalds struct inode *dirp; 11176264d69dSAl Viro __be32 err; 11186264d69dSAl Viro int host_err; 11191da177e4SLinus Torvalds 11201da177e4SLinus Torvalds err = nfserr_perm; 11211da177e4SLinus Torvalds if (!flen) 11221da177e4SLinus Torvalds goto out; 11231da177e4SLinus Torvalds err = nfserr_exist; 11241da177e4SLinus Torvalds if (isdotent(fname, flen)) 11251da177e4SLinus Torvalds goto out; 11261da177e4SLinus Torvalds 11271da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); 11281da177e4SLinus Torvalds if (err) 11291da177e4SLinus Torvalds goto out; 11301da177e4SLinus Torvalds 11311da177e4SLinus Torvalds dentry = fhp->fh_dentry; 11321da177e4SLinus Torvalds dirp = dentry->d_inode; 11331da177e4SLinus Torvalds 11341da177e4SLinus Torvalds err = nfserr_notdir; 11351da177e4SLinus Torvalds if(!dirp->i_op || !dirp->i_op->lookup) 11361da177e4SLinus Torvalds goto out; 11371da177e4SLinus Torvalds /* 11381da177e4SLinus Torvalds * Check whether the response file handle has been verified yet. 11391da177e4SLinus Torvalds * If it has, the parent directory should already be locked. 11401da177e4SLinus Torvalds */ 11411da177e4SLinus Torvalds if (!resfhp->fh_dentry) { 11421da177e4SLinus Torvalds /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ 114312fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 11441da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 11456264d69dSAl Viro host_err = PTR_ERR(dchild); 11461da177e4SLinus Torvalds if (IS_ERR(dchild)) 11471da177e4SLinus Torvalds goto out_nfserr; 11481da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 11491da177e4SLinus Torvalds if (err) 11501da177e4SLinus Torvalds goto out; 11511da177e4SLinus Torvalds } else { 11521da177e4SLinus Torvalds /* called from nfsd_proc_create */ 11531da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 11541da177e4SLinus Torvalds if (!fhp->fh_locked) { 11551da177e4SLinus Torvalds /* not actually possible */ 11561da177e4SLinus Torvalds printk(KERN_ERR 11571da177e4SLinus Torvalds "nfsd_create: parent %s/%s not locked!\n", 11581da177e4SLinus Torvalds dentry->d_parent->d_name.name, 11591da177e4SLinus Torvalds dentry->d_name.name); 1160d75f2b9fSAl Viro err = nfserr_io; 11611da177e4SLinus Torvalds goto out; 11621da177e4SLinus Torvalds } 11631da177e4SLinus Torvalds } 11641da177e4SLinus Torvalds /* 11651da177e4SLinus Torvalds * Make sure the child dentry is still negative ... 11661da177e4SLinus Torvalds */ 11671da177e4SLinus Torvalds err = nfserr_exist; 11681da177e4SLinus Torvalds if (dchild->d_inode) { 11691da177e4SLinus Torvalds dprintk("nfsd_create: dentry %s/%s not negative!\n", 11701da177e4SLinus Torvalds dentry->d_name.name, dchild->d_name.name); 11711da177e4SLinus Torvalds goto out; 11721da177e4SLinus Torvalds } 11731da177e4SLinus Torvalds 11741da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 11751da177e4SLinus Torvalds iap->ia_mode = 0; 11761da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 11771da177e4SLinus Torvalds 11781da177e4SLinus Torvalds /* 11791da177e4SLinus Torvalds * Get the dir op function pointer. 11801da177e4SLinus Torvalds */ 1181088406bcSJ. Bruce Fields err = 0; 11821da177e4SLinus Torvalds switch (type) { 11831da177e4SLinus Torvalds case S_IFREG: 11846264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 11851da177e4SLinus Torvalds break; 11861da177e4SLinus Torvalds case S_IFDIR: 11876264d69dSAl Viro host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); 11881da177e4SLinus Torvalds break; 11891da177e4SLinus Torvalds case S_IFCHR: 11901da177e4SLinus Torvalds case S_IFBLK: 11911da177e4SLinus Torvalds case S_IFIFO: 11921da177e4SLinus Torvalds case S_IFSOCK: 11936264d69dSAl Viro host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 11941da177e4SLinus Torvalds break; 11951da177e4SLinus Torvalds default: 11961da177e4SLinus Torvalds printk("nfsd: bad file type %o in nfsd_create\n", type); 11976264d69dSAl Viro host_err = -EINVAL; 11981da177e4SLinus Torvalds } 11996264d69dSAl Viro if (host_err < 0) 12001da177e4SLinus Torvalds goto out_nfserr; 12011da177e4SLinus Torvalds 12021da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 120345bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(dentry)); 12041da177e4SLinus Torvalds write_inode_now(dchild->d_inode, 1); 12051da177e4SLinus Torvalds } 12061da177e4SLinus Torvalds 12071da177e4SLinus Torvalds 12081da177e4SLinus Torvalds /* Set file attributes. Mode has already been set and 12091da177e4SLinus Torvalds * setting uid/gid works only for root. Irix appears to 12101da177e4SLinus Torvalds * send along the gid when it tries to implement setgid 12111da177e4SLinus Torvalds * directories via NFS. 12121da177e4SLinus Torvalds */ 1213f193fbabSYAMAMOTO Takashi if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) { 12146264d69dSAl Viro __be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 1215f193fbabSYAMAMOTO Takashi if (err2) 1216f193fbabSYAMAMOTO Takashi err = err2; 1217f193fbabSYAMAMOTO Takashi } 12181da177e4SLinus Torvalds /* 12191da177e4SLinus Torvalds * Update the file handle to get the new inode info. 12201da177e4SLinus Torvalds */ 12211da177e4SLinus Torvalds if (!err) 12221da177e4SLinus Torvalds err = fh_update(resfhp); 12231da177e4SLinus Torvalds out: 12241da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 12251da177e4SLinus Torvalds dput(dchild); 12261da177e4SLinus Torvalds return err; 12271da177e4SLinus Torvalds 12281da177e4SLinus Torvalds out_nfserr: 12296264d69dSAl Viro err = nfserrno(host_err); 12301da177e4SLinus Torvalds goto out; 12311da177e4SLinus Torvalds } 12321da177e4SLinus Torvalds 12331da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 12341da177e4SLinus Torvalds /* 12351da177e4SLinus Torvalds * NFSv3 version of nfsd_create 12361da177e4SLinus Torvalds */ 12376264d69dSAl Viro __be32 12381da177e4SLinus Torvalds nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, 12391da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 12401da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 124181ac95c5SJ. Bruce Fields int *truncp, int *created) 12421da177e4SLinus Torvalds { 12431da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 12441da177e4SLinus Torvalds struct inode *dirp; 12456264d69dSAl Viro __be32 err; 12466264d69dSAl Viro int host_err; 12471da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 12481da177e4SLinus Torvalds 12491da177e4SLinus Torvalds err = nfserr_perm; 12501da177e4SLinus Torvalds if (!flen) 12511da177e4SLinus Torvalds goto out; 12521da177e4SLinus Torvalds err = nfserr_exist; 12531da177e4SLinus Torvalds if (isdotent(fname, flen)) 12541da177e4SLinus Torvalds goto out; 12551da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 12561da177e4SLinus Torvalds iap->ia_mode = 0; 12571da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); 12581da177e4SLinus Torvalds if (err) 12591da177e4SLinus Torvalds goto out; 12601da177e4SLinus Torvalds 12611da177e4SLinus Torvalds dentry = fhp->fh_dentry; 12621da177e4SLinus Torvalds dirp = dentry->d_inode; 12631da177e4SLinus Torvalds 12641da177e4SLinus Torvalds /* Get all the sanity checks out of the way before 12651da177e4SLinus Torvalds * we lock the parent. */ 12661da177e4SLinus Torvalds err = nfserr_notdir; 12671da177e4SLinus Torvalds if(!dirp->i_op || !dirp->i_op->lookup) 12681da177e4SLinus Torvalds goto out; 126912fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 12701da177e4SLinus Torvalds 12711da177e4SLinus Torvalds /* 12721da177e4SLinus Torvalds * Compose the response file handle. 12731da177e4SLinus Torvalds */ 12741da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 12756264d69dSAl Viro host_err = PTR_ERR(dchild); 12761da177e4SLinus Torvalds if (IS_ERR(dchild)) 12771da177e4SLinus Torvalds goto out_nfserr; 12781da177e4SLinus Torvalds 12791da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 12801da177e4SLinus Torvalds if (err) 12811da177e4SLinus Torvalds goto out; 12821da177e4SLinus Torvalds 12831da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1284*c397852cSPeter Staubach /* solaris7 gets confused (bugid 4218508) if these have 1285*c397852cSPeter Staubach * the high bit set, so just clear the high bits. 12861da177e4SLinus Torvalds */ 12871da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 12881da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 12891da177e4SLinus Torvalds } 12901da177e4SLinus Torvalds 12911da177e4SLinus Torvalds if (dchild->d_inode) { 12921da177e4SLinus Torvalds err = 0; 12931da177e4SLinus Torvalds 12941da177e4SLinus Torvalds switch (createmode) { 12951da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 12961da177e4SLinus Torvalds if (! S_ISREG(dchild->d_inode->i_mode)) 12971da177e4SLinus Torvalds err = nfserr_exist; 12981da177e4SLinus Torvalds else if (truncp) { 12991da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 13001da177e4SLinus Torvalds * differently. we don't want to truncate the 13011da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 13021da177e4SLinus Torvalds * fails for some other reason. furthermore, 13031da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 13041da177e4SLinus Torvalds * according to spec! 13051da177e4SLinus Torvalds */ 13061da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 13071da177e4SLinus Torvalds } 13081da177e4SLinus Torvalds else { 13091da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 13101da177e4SLinus Torvalds goto set_attr; 13111da177e4SLinus Torvalds } 13121da177e4SLinus Torvalds break; 13131da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 13141da177e4SLinus Torvalds if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 13151da177e4SLinus Torvalds && dchild->d_inode->i_atime.tv_sec == v_atime 13161da177e4SLinus Torvalds && dchild->d_inode->i_size == 0 ) 13171da177e4SLinus Torvalds break; 13181da177e4SLinus Torvalds /* fallthru */ 13191da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 13201da177e4SLinus Torvalds err = nfserr_exist; 13211da177e4SLinus Torvalds } 13221da177e4SLinus Torvalds goto out; 13231da177e4SLinus Torvalds } 13241da177e4SLinus Torvalds 13256264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 13266264d69dSAl Viro if (host_err < 0) 13271da177e4SLinus Torvalds goto out_nfserr; 132881ac95c5SJ. Bruce Fields if (created) 132981ac95c5SJ. Bruce Fields *created = 1; 13301da177e4SLinus Torvalds 13311da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 133245bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(dentry)); 13331da177e4SLinus Torvalds /* setattr will sync the child (or not) */ 13341da177e4SLinus Torvalds } 13351da177e4SLinus Torvalds 13361da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1337*c397852cSPeter Staubach /* Cram the verifier into atime/mtime */ 13381da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 1339*c397852cSPeter Staubach | ATTR_MTIME_SET|ATTR_ATIME_SET; 13401da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 13411da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 13421da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 13431da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 13441da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 13451da177e4SLinus Torvalds } 13461da177e4SLinus Torvalds 13471da177e4SLinus Torvalds /* Set file attributes. 13481da177e4SLinus Torvalds * Irix appears to send along the gid when it tries to 13491da177e4SLinus Torvalds * implement setgid directories via NFS. Clear out all that cruft. 13501da177e4SLinus Torvalds */ 13511da177e4SLinus Torvalds set_attr: 1352*c397852cSPeter Staubach if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) { 13536264d69dSAl Viro __be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 1354f193fbabSYAMAMOTO Takashi if (err2) 135545bd3b3dSNeilBrown err = err2; 1356f193fbabSYAMAMOTO Takashi } 1357f193fbabSYAMAMOTO Takashi 1358f193fbabSYAMAMOTO Takashi /* 1359f193fbabSYAMAMOTO Takashi * Update the filehandle to get the new inode info. 1360f193fbabSYAMAMOTO Takashi */ 1361f193fbabSYAMAMOTO Takashi if (!err) 1362f193fbabSYAMAMOTO Takashi err = fh_update(resfhp); 13631da177e4SLinus Torvalds 13641da177e4SLinus Torvalds out: 13651da177e4SLinus Torvalds fh_unlock(fhp); 13661da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 13671da177e4SLinus Torvalds dput(dchild); 13681da177e4SLinus Torvalds return err; 13691da177e4SLinus Torvalds 13701da177e4SLinus Torvalds out_nfserr: 13716264d69dSAl Viro err = nfserrno(host_err); 13721da177e4SLinus Torvalds goto out; 13731da177e4SLinus Torvalds } 13741da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 13751da177e4SLinus Torvalds 13761da177e4SLinus Torvalds /* 13771da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 13781da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 13791da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 13801da177e4SLinus Torvalds */ 13816264d69dSAl Viro __be32 13821da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 13831da177e4SLinus Torvalds { 13841da177e4SLinus Torvalds struct dentry *dentry; 13851da177e4SLinus Torvalds struct inode *inode; 13861da177e4SLinus Torvalds mm_segment_t oldfs; 13876264d69dSAl Viro __be32 err; 13886264d69dSAl Viro int host_err; 13891da177e4SLinus Torvalds 13901da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP); 13911da177e4SLinus Torvalds if (err) 13921da177e4SLinus Torvalds goto out; 13931da177e4SLinus Torvalds 13941da177e4SLinus Torvalds dentry = fhp->fh_dentry; 13951da177e4SLinus Torvalds inode = dentry->d_inode; 13961da177e4SLinus Torvalds 13971da177e4SLinus Torvalds err = nfserr_inval; 13981da177e4SLinus Torvalds if (!inode->i_op || !inode->i_op->readlink) 13991da177e4SLinus Torvalds goto out; 14001da177e4SLinus Torvalds 14011da177e4SLinus Torvalds touch_atime(fhp->fh_export->ex_mnt, dentry); 14021da177e4SLinus Torvalds /* N.B. Why does this call need a get_fs()?? 14031da177e4SLinus Torvalds * Remove the set_fs and watch the fireworks:-) --okir 14041da177e4SLinus Torvalds */ 14051da177e4SLinus Torvalds 14061da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 14076264d69dSAl Viro host_err = inode->i_op->readlink(dentry, buf, *lenp); 14081da177e4SLinus Torvalds set_fs(oldfs); 14091da177e4SLinus Torvalds 14106264d69dSAl Viro if (host_err < 0) 14111da177e4SLinus Torvalds goto out_nfserr; 14126264d69dSAl Viro *lenp = host_err; 14131da177e4SLinus Torvalds err = 0; 14141da177e4SLinus Torvalds out: 14151da177e4SLinus Torvalds return err; 14161da177e4SLinus Torvalds 14171da177e4SLinus Torvalds out_nfserr: 14186264d69dSAl Viro err = nfserrno(host_err); 14191da177e4SLinus Torvalds goto out; 14201da177e4SLinus Torvalds } 14211da177e4SLinus Torvalds 14221da177e4SLinus Torvalds /* 14231da177e4SLinus Torvalds * Create a symlink and look up its inode 14241da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 14251da177e4SLinus Torvalds */ 14266264d69dSAl Viro __be32 14271da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 14281da177e4SLinus Torvalds char *fname, int flen, 14291da177e4SLinus Torvalds char *path, int plen, 14301da177e4SLinus Torvalds struct svc_fh *resfhp, 14311da177e4SLinus Torvalds struct iattr *iap) 14321da177e4SLinus Torvalds { 14331da177e4SLinus Torvalds struct dentry *dentry, *dnew; 14346264d69dSAl Viro __be32 err, cerr; 14356264d69dSAl Viro int host_err; 14361da177e4SLinus Torvalds umode_t mode; 14371da177e4SLinus Torvalds 14381da177e4SLinus Torvalds err = nfserr_noent; 14391da177e4SLinus Torvalds if (!flen || !plen) 14401da177e4SLinus Torvalds goto out; 14411da177e4SLinus Torvalds err = nfserr_exist; 14421da177e4SLinus Torvalds if (isdotent(fname, flen)) 14431da177e4SLinus Torvalds goto out; 14441da177e4SLinus Torvalds 14451da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); 14461da177e4SLinus Torvalds if (err) 14471da177e4SLinus Torvalds goto out; 14481da177e4SLinus Torvalds fh_lock(fhp); 14491da177e4SLinus Torvalds dentry = fhp->fh_dentry; 14501da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 14516264d69dSAl Viro host_err = PTR_ERR(dnew); 14521da177e4SLinus Torvalds if (IS_ERR(dnew)) 14531da177e4SLinus Torvalds goto out_nfserr; 14541da177e4SLinus Torvalds 14551da177e4SLinus Torvalds mode = S_IALLUGO; 14561da177e4SLinus Torvalds /* Only the MODE ATTRibute is even vaguely meaningful */ 14571da177e4SLinus Torvalds if (iap && (iap->ia_valid & ATTR_MODE)) 14581da177e4SLinus Torvalds mode = iap->ia_mode & S_IALLUGO; 14591da177e4SLinus Torvalds 14601da177e4SLinus Torvalds if (unlikely(path[plen] != 0)) { 14611da177e4SLinus Torvalds char *path_alloced = kmalloc(plen+1, GFP_KERNEL); 14621da177e4SLinus Torvalds if (path_alloced == NULL) 14636264d69dSAl Viro host_err = -ENOMEM; 14641da177e4SLinus Torvalds else { 14651da177e4SLinus Torvalds strncpy(path_alloced, path, plen); 14661da177e4SLinus Torvalds path_alloced[plen] = 0; 14676264d69dSAl Viro host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode); 14681da177e4SLinus Torvalds kfree(path_alloced); 14691da177e4SLinus Torvalds } 14701da177e4SLinus Torvalds } else 14716264d69dSAl Viro host_err = vfs_symlink(dentry->d_inode, dnew, path, mode); 14721da177e4SLinus Torvalds 14736264d69dSAl Viro if (!host_err) { 14741da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 14756264d69dSAl Viro host_err = nfsd_sync_dir(dentry); 14766264d69dSAl Viro } 14776264d69dSAl Viro err = nfserrno(host_err); 14781da177e4SLinus Torvalds fh_unlock(fhp); 14791da177e4SLinus Torvalds 14801da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 14811da177e4SLinus Torvalds dput(dnew); 14821da177e4SLinus Torvalds if (err==0) err = cerr; 14831da177e4SLinus Torvalds out: 14841da177e4SLinus Torvalds return err; 14851da177e4SLinus Torvalds 14861da177e4SLinus Torvalds out_nfserr: 14876264d69dSAl Viro err = nfserrno(host_err); 14881da177e4SLinus Torvalds goto out; 14891da177e4SLinus Torvalds } 14901da177e4SLinus Torvalds 14911da177e4SLinus Torvalds /* 14921da177e4SLinus Torvalds * Create a hardlink 14931da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 14941da177e4SLinus Torvalds */ 14956264d69dSAl Viro __be32 14961da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 14971da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 14981da177e4SLinus Torvalds { 14991da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 15001da177e4SLinus Torvalds struct inode *dirp, *dest; 15016264d69dSAl Viro __be32 err; 15026264d69dSAl Viro int host_err; 15031da177e4SLinus Torvalds 15041da177e4SLinus Torvalds err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE); 15051da177e4SLinus Torvalds if (err) 15061da177e4SLinus Torvalds goto out; 15071da177e4SLinus Torvalds err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP); 15081da177e4SLinus Torvalds if (err) 15091da177e4SLinus Torvalds goto out; 15101da177e4SLinus Torvalds 15111da177e4SLinus Torvalds err = nfserr_perm; 15121da177e4SLinus Torvalds if (!len) 15131da177e4SLinus Torvalds goto out; 15141da177e4SLinus Torvalds err = nfserr_exist; 15151da177e4SLinus Torvalds if (isdotent(name, len)) 15161da177e4SLinus Torvalds goto out; 15171da177e4SLinus Torvalds 151812fd3520SPeter Zijlstra fh_lock_nested(ffhp, I_MUTEX_PARENT); 15191da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 15201da177e4SLinus Torvalds dirp = ddir->d_inode; 15211da177e4SLinus Torvalds 15221da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 15236264d69dSAl Viro host_err = PTR_ERR(dnew); 15241da177e4SLinus Torvalds if (IS_ERR(dnew)) 15251da177e4SLinus Torvalds goto out_nfserr; 15261da177e4SLinus Torvalds 15271da177e4SLinus Torvalds dold = tfhp->fh_dentry; 15281da177e4SLinus Torvalds dest = dold->d_inode; 15291da177e4SLinus Torvalds 15306264d69dSAl Viro host_err = vfs_link(dold, dirp, dnew); 15316264d69dSAl Viro if (!host_err) { 15321da177e4SLinus Torvalds if (EX_ISSYNC(ffhp->fh_export)) { 153345bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(ddir)); 15341da177e4SLinus Torvalds write_inode_now(dest, 1); 15351da177e4SLinus Torvalds } 15366264d69dSAl Viro err = 0; 15371da177e4SLinus Torvalds } else { 15386264d69dSAl Viro if (host_err == -EXDEV && rqstp->rq_vers == 2) 15391da177e4SLinus Torvalds err = nfserr_acces; 15401da177e4SLinus Torvalds else 15416264d69dSAl Viro err = nfserrno(host_err); 15421da177e4SLinus Torvalds } 15431da177e4SLinus Torvalds 15441da177e4SLinus Torvalds dput(dnew); 1545270d56e5SDavid M. Richter out_unlock: 1546270d56e5SDavid M. Richter fh_unlock(ffhp); 15471da177e4SLinus Torvalds out: 15481da177e4SLinus Torvalds return err; 15491da177e4SLinus Torvalds 15501da177e4SLinus Torvalds out_nfserr: 15516264d69dSAl Viro err = nfserrno(host_err); 1552270d56e5SDavid M. Richter goto out_unlock; 15531da177e4SLinus Torvalds } 15541da177e4SLinus Torvalds 15551da177e4SLinus Torvalds /* 15561da177e4SLinus Torvalds * Rename a file 15571da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 15581da177e4SLinus Torvalds */ 15596264d69dSAl Viro __be32 15601da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 15611da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 15621da177e4SLinus Torvalds { 15631da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 15641da177e4SLinus Torvalds struct inode *fdir, *tdir; 15656264d69dSAl Viro __be32 err; 15666264d69dSAl Viro int host_err; 15671da177e4SLinus Torvalds 15681da177e4SLinus Torvalds err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE); 15691da177e4SLinus Torvalds if (err) 15701da177e4SLinus Torvalds goto out; 15711da177e4SLinus Torvalds err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE); 15721da177e4SLinus Torvalds if (err) 15731da177e4SLinus Torvalds goto out; 15741da177e4SLinus Torvalds 15751da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 15761da177e4SLinus Torvalds fdir = fdentry->d_inode; 15771da177e4SLinus Torvalds 15781da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 15791da177e4SLinus Torvalds tdir = tdentry->d_inode; 15801da177e4SLinus Torvalds 15811da177e4SLinus Torvalds err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; 1582a56f3937SNeilBrown if (ffhp->fh_export != tfhp->fh_export) 15831da177e4SLinus Torvalds goto out; 15841da177e4SLinus Torvalds 15851da177e4SLinus Torvalds err = nfserr_perm; 15861da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 15871da177e4SLinus Torvalds goto out; 15881da177e4SLinus Torvalds 15891da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 15901da177e4SLinus Torvalds * so do it by hand */ 15911da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 15921da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 1; 15931da177e4SLinus Torvalds fill_pre_wcc(ffhp); 15941da177e4SLinus Torvalds fill_pre_wcc(tfhp); 15951da177e4SLinus Torvalds 15961da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 15976264d69dSAl Viro host_err = PTR_ERR(odentry); 15981da177e4SLinus Torvalds if (IS_ERR(odentry)) 15991da177e4SLinus Torvalds goto out_nfserr; 16001da177e4SLinus Torvalds 16016264d69dSAl Viro host_err = -ENOENT; 16021da177e4SLinus Torvalds if (!odentry->d_inode) 16031da177e4SLinus Torvalds goto out_dput_old; 16046264d69dSAl Viro host_err = -EINVAL; 16051da177e4SLinus Torvalds if (odentry == trap) 16061da177e4SLinus Torvalds goto out_dput_old; 16071da177e4SLinus Torvalds 16081da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 16096264d69dSAl Viro host_err = PTR_ERR(ndentry); 16101da177e4SLinus Torvalds if (IS_ERR(ndentry)) 16111da177e4SLinus Torvalds goto out_dput_old; 16126264d69dSAl Viro host_err = -ENOTEMPTY; 16131da177e4SLinus Torvalds if (ndentry == trap) 16141da177e4SLinus Torvalds goto out_dput_new; 16151da177e4SLinus Torvalds 16161da177e4SLinus Torvalds #ifdef MSNFS 16171da177e4SLinus Torvalds if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) && 16181da177e4SLinus Torvalds ((atomic_read(&odentry->d_count) > 1) 16191da177e4SLinus Torvalds || (atomic_read(&ndentry->d_count) > 1))) { 16206264d69dSAl Viro host_err = -EPERM; 16211da177e4SLinus Torvalds } else 16221da177e4SLinus Torvalds #endif 16236264d69dSAl Viro host_err = vfs_rename(fdir, odentry, tdir, ndentry); 16246264d69dSAl Viro if (!host_err && EX_ISSYNC(tfhp->fh_export)) { 16256264d69dSAl Viro host_err = nfsd_sync_dir(tdentry); 16266264d69dSAl Viro if (!host_err) 16276264d69dSAl Viro host_err = nfsd_sync_dir(fdentry); 16281da177e4SLinus Torvalds } 16291da177e4SLinus Torvalds 16301da177e4SLinus Torvalds out_dput_new: 16311da177e4SLinus Torvalds dput(ndentry); 16321da177e4SLinus Torvalds out_dput_old: 16331da177e4SLinus Torvalds dput(odentry); 16341da177e4SLinus Torvalds out_nfserr: 16356264d69dSAl Viro err = nfserrno(host_err); 16361da177e4SLinus Torvalds 16371da177e4SLinus Torvalds /* we cannot reply on fh_unlock on the two filehandles, 16381da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 16391da177e4SLinus Torvalds * were the same, so again we do it by hand 16401da177e4SLinus Torvalds */ 16411da177e4SLinus Torvalds fill_post_wcc(ffhp); 16421da177e4SLinus Torvalds fill_post_wcc(tfhp); 16431da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 16441da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 0; 16451da177e4SLinus Torvalds 16461da177e4SLinus Torvalds out: 16471da177e4SLinus Torvalds return err; 16481da177e4SLinus Torvalds } 16491da177e4SLinus Torvalds 16501da177e4SLinus Torvalds /* 16511da177e4SLinus Torvalds * Unlink a file or directory 16521da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 16531da177e4SLinus Torvalds */ 16546264d69dSAl Viro __be32 16551da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 16561da177e4SLinus Torvalds char *fname, int flen) 16571da177e4SLinus Torvalds { 16581da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 16591da177e4SLinus Torvalds struct inode *dirp; 16606264d69dSAl Viro __be32 err; 16616264d69dSAl Viro int host_err; 16621da177e4SLinus Torvalds 16631da177e4SLinus Torvalds err = nfserr_acces; 16641da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 16651da177e4SLinus Torvalds goto out; 16661da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE); 16671da177e4SLinus Torvalds if (err) 16681da177e4SLinus Torvalds goto out; 16691da177e4SLinus Torvalds 167012fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 16711da177e4SLinus Torvalds dentry = fhp->fh_dentry; 16721da177e4SLinus Torvalds dirp = dentry->d_inode; 16731da177e4SLinus Torvalds 16741da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 16756264d69dSAl Viro host_err = PTR_ERR(rdentry); 16761da177e4SLinus Torvalds if (IS_ERR(rdentry)) 16771da177e4SLinus Torvalds goto out_nfserr; 16781da177e4SLinus Torvalds 16791da177e4SLinus Torvalds if (!rdentry->d_inode) { 16801da177e4SLinus Torvalds dput(rdentry); 16811da177e4SLinus Torvalds err = nfserr_noent; 16821da177e4SLinus Torvalds goto out; 16831da177e4SLinus Torvalds } 16841da177e4SLinus Torvalds 16851da177e4SLinus Torvalds if (!type) 16861da177e4SLinus Torvalds type = rdentry->d_inode->i_mode & S_IFMT; 16871da177e4SLinus Torvalds 16881da177e4SLinus Torvalds if (type != S_IFDIR) { /* It's UNLINK */ 16891da177e4SLinus Torvalds #ifdef MSNFS 16901da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 16911da177e4SLinus Torvalds (atomic_read(&rdentry->d_count) > 1)) { 16926264d69dSAl Viro host_err = -EPERM; 16931da177e4SLinus Torvalds } else 16941da177e4SLinus Torvalds #endif 16956264d69dSAl Viro host_err = vfs_unlink(dirp, rdentry); 16961da177e4SLinus Torvalds } else { /* It's RMDIR */ 16976264d69dSAl Viro host_err = vfs_rmdir(dirp, rdentry); 16981da177e4SLinus Torvalds } 16991da177e4SLinus Torvalds 17001da177e4SLinus Torvalds dput(rdentry); 17011da177e4SLinus Torvalds 17026264d69dSAl Viro if (host_err) 17036264d69dSAl Viro goto out_nfserr; 17046264d69dSAl Viro if (EX_ISSYNC(fhp->fh_export)) 17056264d69dSAl Viro host_err = nfsd_sync_dir(dentry); 17061da177e4SLinus Torvalds 17071da177e4SLinus Torvalds out_nfserr: 17086264d69dSAl Viro err = nfserrno(host_err); 1709f193fbabSYAMAMOTO Takashi out: 1710f193fbabSYAMAMOTO Takashi return err; 17111da177e4SLinus Torvalds } 17121da177e4SLinus Torvalds 17131da177e4SLinus Torvalds /* 17141da177e4SLinus Torvalds * Read entries from a directory. 17151da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 17161da177e4SLinus Torvalds */ 17176264d69dSAl Viro __be32 17181da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 17191da177e4SLinus Torvalds struct readdir_cd *cdp, encode_dent_fn func) 17201da177e4SLinus Torvalds { 17216264d69dSAl Viro __be32 err; 17226264d69dSAl Viro int host_err; 17231da177e4SLinus Torvalds struct file *file; 17241da177e4SLinus Torvalds loff_t offset = *offsetp; 17251da177e4SLinus Torvalds 17261da177e4SLinus Torvalds err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file); 17271da177e4SLinus Torvalds if (err) 17281da177e4SLinus Torvalds goto out; 17291da177e4SLinus Torvalds 17301da177e4SLinus Torvalds offset = vfs_llseek(file, offset, 0); 17311da177e4SLinus Torvalds if (offset < 0) { 17321da177e4SLinus Torvalds err = nfserrno((int)offset); 17331da177e4SLinus Torvalds goto out_close; 17341da177e4SLinus Torvalds } 17351da177e4SLinus Torvalds 17361da177e4SLinus Torvalds /* 17371da177e4SLinus Torvalds * Read the directory entries. This silly loop is necessary because 17381da177e4SLinus Torvalds * readdir() is not guaranteed to fill up the entire buffer, but 17391da177e4SLinus Torvalds * may choose to do less. 17401da177e4SLinus Torvalds */ 17411da177e4SLinus Torvalds 17421da177e4SLinus Torvalds do { 17431da177e4SLinus Torvalds cdp->err = nfserr_eof; /* will be cleared on successful read */ 17446264d69dSAl Viro host_err = vfs_readdir(file, (filldir_t) func, cdp); 17456264d69dSAl Viro } while (host_err >=0 && cdp->err == nfs_ok); 17466264d69dSAl Viro if (host_err) 17476264d69dSAl Viro err = nfserrno(host_err); 17481da177e4SLinus Torvalds else 17491da177e4SLinus Torvalds err = cdp->err; 17501da177e4SLinus Torvalds *offsetp = vfs_llseek(file, 0, 1); 17511da177e4SLinus Torvalds 17521da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 17531da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 17541da177e4SLinus Torvalds out_close: 17551da177e4SLinus Torvalds nfsd_close(file); 17561da177e4SLinus Torvalds out: 17571da177e4SLinus Torvalds return err; 17581da177e4SLinus Torvalds } 17591da177e4SLinus Torvalds 17601da177e4SLinus Torvalds /* 17611da177e4SLinus Torvalds * Get file system stats 17621da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 17631da177e4SLinus Torvalds */ 17646264d69dSAl Viro __be32 17651da177e4SLinus Torvalds nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat) 17661da177e4SLinus Torvalds { 17676264d69dSAl Viro __be32 err = fh_verify(rqstp, fhp, 0, MAY_NOP); 1768726c3342SDavid Howells if (!err && vfs_statfs(fhp->fh_dentry,stat)) 17691da177e4SLinus Torvalds err = nfserr_io; 17701da177e4SLinus Torvalds return err; 17711da177e4SLinus Torvalds } 17721da177e4SLinus Torvalds 17731da177e4SLinus Torvalds /* 17741da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 17751da177e4SLinus Torvalds */ 17766264d69dSAl Viro __be32 17771da177e4SLinus Torvalds nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc) 17781da177e4SLinus Torvalds { 17791da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 17801da177e4SLinus Torvalds int err; 17811da177e4SLinus Torvalds 17821da177e4SLinus Torvalds if (acc == MAY_NOP) 17831da177e4SLinus Torvalds return 0; 17841da177e4SLinus Torvalds #if 0 17851da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 17861da177e4SLinus Torvalds acc, 17871da177e4SLinus Torvalds (acc & MAY_READ)? " read" : "", 17881da177e4SLinus Torvalds (acc & MAY_WRITE)? " write" : "", 17891da177e4SLinus Torvalds (acc & MAY_EXEC)? " exec" : "", 17901da177e4SLinus Torvalds (acc & MAY_SATTR)? " sattr" : "", 17911da177e4SLinus Torvalds (acc & MAY_TRUNC)? " trunc" : "", 17921da177e4SLinus Torvalds (acc & MAY_LOCK)? " lock" : "", 17931da177e4SLinus Torvalds (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "", 17941da177e4SLinus Torvalds inode->i_mode, 17951da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 17961da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 17971da177e4SLinus Torvalds IS_RDONLY(inode)? " ro" : ""); 17981da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 17991da177e4SLinus Torvalds inode->i_uid, inode->i_gid, current->fsuid, current->fsgid); 18001da177e4SLinus Torvalds #endif 18011da177e4SLinus Torvalds 18021da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 18031da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 18041da177e4SLinus Torvalds * device special file, we ignore rofs. 18051da177e4SLinus Torvalds */ 18061da177e4SLinus Torvalds if (!(acc & MAY_LOCAL_ACCESS)) 18071da177e4SLinus Torvalds if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) { 18081da177e4SLinus Torvalds if (EX_RDONLY(exp) || IS_RDONLY(inode)) 18091da177e4SLinus Torvalds return nfserr_rofs; 18101da177e4SLinus Torvalds if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode)) 18111da177e4SLinus Torvalds return nfserr_perm; 18121da177e4SLinus Torvalds } 18131da177e4SLinus Torvalds if ((acc & MAY_TRUNC) && IS_APPEND(inode)) 18141da177e4SLinus Torvalds return nfserr_perm; 18151da177e4SLinus Torvalds 18161da177e4SLinus Torvalds if (acc & MAY_LOCK) { 18171da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 18181da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 18191da177e4SLinus Torvalds * ownership 18201da177e4SLinus Torvalds */ 18211da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 18221da177e4SLinus Torvalds return 0; 18231da177e4SLinus Torvalds else 18241da177e4SLinus Torvalds acc = MAY_READ | MAY_OWNER_OVERRIDE; 18251da177e4SLinus Torvalds } 18261da177e4SLinus Torvalds /* 18271da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 18281da177e4SLinus Torvalds * would normally be checked at open time. This is to make 18291da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 18301da177e4SLinus Torvalds * 18311da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 18321da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 18331da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 18341da177e4SLinus Torvalds * always implies file truncation. 18351da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 18361da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 18371da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 18381da177e4SLinus Torvalds * with NFSv3. 18391da177e4SLinus Torvalds */ 18401da177e4SLinus Torvalds if ((acc & MAY_OWNER_OVERRIDE) && 18411da177e4SLinus Torvalds inode->i_uid == current->fsuid) 18421da177e4SLinus Torvalds return 0; 18431da177e4SLinus Torvalds 18441da177e4SLinus Torvalds err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL); 18451da177e4SLinus Torvalds 18461da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 18471da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 18481da177e4SLinus Torvalds acc == (MAY_READ | MAY_OWNER_OVERRIDE)) 18491da177e4SLinus Torvalds err = permission(inode, MAY_EXEC, NULL); 18501da177e4SLinus Torvalds 18511da177e4SLinus Torvalds return err? nfserrno(err) : 0; 18521da177e4SLinus Torvalds } 18531da177e4SLinus Torvalds 18541da177e4SLinus Torvalds void 18551da177e4SLinus Torvalds nfsd_racache_shutdown(void) 18561da177e4SLinus Torvalds { 1857fce1456aSGreg Banks if (!raparml) 18581da177e4SLinus Torvalds return; 18591da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 18601da177e4SLinus Torvalds kfree(raparml); 1861fce1456aSGreg Banks raparml = NULL; 18621da177e4SLinus Torvalds } 18631da177e4SLinus Torvalds /* 18641da177e4SLinus Torvalds * Initialize readahead param cache 18651da177e4SLinus Torvalds */ 18661da177e4SLinus Torvalds int 18671da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 18681da177e4SLinus Torvalds { 18691da177e4SLinus Torvalds int i; 1870fce1456aSGreg Banks int j = 0; 1871fce1456aSGreg Banks int nperbucket; 18721da177e4SLinus Torvalds 1873fce1456aSGreg Banks 1874fce1456aSGreg Banks if (raparml) 18751da177e4SLinus Torvalds return 0; 1876fce1456aSGreg Banks if (cache_size < 2*RAPARM_HASH_SIZE) 1877fce1456aSGreg Banks cache_size = 2*RAPARM_HASH_SIZE; 18784b3bb06bSYan Burman raparml = kcalloc(cache_size, sizeof(struct raparms), GFP_KERNEL); 18791da177e4SLinus Torvalds 18804b3bb06bSYan Burman if (!raparml) { 18814b3bb06bSYan Burman printk(KERN_WARNING 18824b3bb06bSYan Burman "nfsd: Could not allocate memory read-ahead cache.\n"); 18834b3bb06bSYan Burman return -ENOMEM; 18844b3bb06bSYan Burman } 18854b3bb06bSYan Burman 18864b3bb06bSYan Burman dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); 1887fce1456aSGreg Banks for (i = 0 ; i < RAPARM_HASH_SIZE ; i++) { 1888fce1456aSGreg Banks raparm_hash[i].pb_head = NULL; 1889fce1456aSGreg Banks spin_lock_init(&raparm_hash[i].pb_lock); 1890fce1456aSGreg Banks } 1891fce1456aSGreg Banks nperbucket = cache_size >> RAPARM_HASH_BITS; 18921da177e4SLinus Torvalds for (i = 0; i < cache_size - 1; i++) { 1893fce1456aSGreg Banks if (i % nperbucket == 0) 1894fce1456aSGreg Banks raparm_hash[j++].pb_head = raparml + i; 1895fce1456aSGreg Banks if (i % nperbucket < nperbucket-1) 18961da177e4SLinus Torvalds raparml[i].p_next = raparml + i + 1; 18971da177e4SLinus Torvalds } 18984b3bb06bSYan Burman 18991da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 19001da177e4SLinus Torvalds return 0; 19011da177e4SLinus Torvalds } 1902a257cdd0SAndreas Gruenbacher 1903a257cdd0SAndreas Gruenbacher #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 1904a257cdd0SAndreas Gruenbacher struct posix_acl * 1905a257cdd0SAndreas Gruenbacher nfsd_get_posix_acl(struct svc_fh *fhp, int type) 1906a257cdd0SAndreas Gruenbacher { 1907a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 1908a257cdd0SAndreas Gruenbacher char *name; 1909a257cdd0SAndreas Gruenbacher void *value = NULL; 1910a257cdd0SAndreas Gruenbacher ssize_t size; 1911a257cdd0SAndreas Gruenbacher struct posix_acl *acl; 1912a257cdd0SAndreas Gruenbacher 19135be196e5SChristoph Hellwig if (!IS_POSIXACL(inode)) 1914a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 19155be196e5SChristoph Hellwig 1916a257cdd0SAndreas Gruenbacher switch (type) { 1917a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 1918334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 1919a257cdd0SAndreas Gruenbacher break; 1920a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 1921334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 1922a257cdd0SAndreas Gruenbacher break; 1923a257cdd0SAndreas Gruenbacher default: 1924a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 1925a257cdd0SAndreas Gruenbacher } 1926a257cdd0SAndreas Gruenbacher 19275be196e5SChristoph Hellwig size = nfsd_getxattr(fhp->fh_dentry, name, &value); 19285be196e5SChristoph Hellwig if (size < 0) 19295be196e5SChristoph Hellwig return ERR_PTR(size); 1930a257cdd0SAndreas Gruenbacher 1931a257cdd0SAndreas Gruenbacher acl = posix_acl_from_xattr(value, size); 1932a257cdd0SAndreas Gruenbacher kfree(value); 1933a257cdd0SAndreas Gruenbacher return acl; 1934a257cdd0SAndreas Gruenbacher } 1935a257cdd0SAndreas Gruenbacher 1936a257cdd0SAndreas Gruenbacher int 1937a257cdd0SAndreas Gruenbacher nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) 1938a257cdd0SAndreas Gruenbacher { 1939a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 1940a257cdd0SAndreas Gruenbacher char *name; 1941a257cdd0SAndreas Gruenbacher void *value = NULL; 1942a257cdd0SAndreas Gruenbacher size_t size; 1943a257cdd0SAndreas Gruenbacher int error; 1944a257cdd0SAndreas Gruenbacher 1945a257cdd0SAndreas Gruenbacher if (!IS_POSIXACL(inode) || !inode->i_op || 1946a257cdd0SAndreas Gruenbacher !inode->i_op->setxattr || !inode->i_op->removexattr) 1947a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 1948a257cdd0SAndreas Gruenbacher switch(type) { 1949a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 1950334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 1951a257cdd0SAndreas Gruenbacher break; 1952a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 1953334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 1954a257cdd0SAndreas Gruenbacher break; 1955a257cdd0SAndreas Gruenbacher default: 1956a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 1957a257cdd0SAndreas Gruenbacher } 1958a257cdd0SAndreas Gruenbacher 1959a257cdd0SAndreas Gruenbacher if (acl && acl->a_count) { 1960334a13ecSChristoph Hellwig size = posix_acl_xattr_size(acl->a_count); 1961a257cdd0SAndreas Gruenbacher value = kmalloc(size, GFP_KERNEL); 1962a257cdd0SAndreas Gruenbacher if (!value) 1963a257cdd0SAndreas Gruenbacher return -ENOMEM; 19649ccfc29cSFlorin Malita error = posix_acl_to_xattr(acl, value, size); 19659ccfc29cSFlorin Malita if (error < 0) 1966a257cdd0SAndreas Gruenbacher goto getout; 19679ccfc29cSFlorin Malita size = error; 1968a257cdd0SAndreas Gruenbacher } else 1969a257cdd0SAndreas Gruenbacher size = 0; 1970a257cdd0SAndreas Gruenbacher 1971a257cdd0SAndreas Gruenbacher if (size) 19725be196e5SChristoph Hellwig error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); 1973a257cdd0SAndreas Gruenbacher else { 1974a257cdd0SAndreas Gruenbacher if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) 1975a257cdd0SAndreas Gruenbacher error = 0; 1976a257cdd0SAndreas Gruenbacher else { 19775be196e5SChristoph Hellwig error = vfs_removexattr(fhp->fh_dentry, name); 1978a257cdd0SAndreas Gruenbacher if (error == -ENODATA) 1979a257cdd0SAndreas Gruenbacher error = 0; 1980a257cdd0SAndreas Gruenbacher } 1981a257cdd0SAndreas Gruenbacher } 1982a257cdd0SAndreas Gruenbacher 1983a257cdd0SAndreas Gruenbacher getout: 1984a257cdd0SAndreas Gruenbacher kfree(value); 1985a257cdd0SAndreas Gruenbacher return error; 1986a257cdd0SAndreas Gruenbacher } 1987a257cdd0SAndreas Gruenbacher #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ 1988