11da177e4SLinus Torvalds #define MSNFS /* HACK HACK */ 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * linux/fs/nfsd/vfs.c 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * File operations used by nfsd. Some of these have been ripped from 61da177e4SLinus Torvalds * other parts of the kernel because they weren't exported, others 71da177e4SLinus Torvalds * are partial duplicates with added or changed functionality. 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * Note that several functions dget() the dentry upon which they want 101da177e4SLinus Torvalds * to act, most notably those that create directory entries. Response 111da177e4SLinus Torvalds * dentry's are dput()'d if necessary in the release callback. 121da177e4SLinus Torvalds * So if you notice code paths that apparently fail to dput() the 131da177e4SLinus Torvalds * dentry, don't worry--they have been taken care of. 141da177e4SLinus Torvalds * 151da177e4SLinus Torvalds * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> 161da177e4SLinus Torvalds * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> 171da177e4SLinus Torvalds */ 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds #include <linux/string.h> 201da177e4SLinus Torvalds #include <linux/time.h> 211da177e4SLinus Torvalds #include <linux/errno.h> 221da177e4SLinus Torvalds #include <linux/fs.h> 231da177e4SLinus Torvalds #include <linux/file.h> 241da177e4SLinus Torvalds #include <linux/mount.h> 251da177e4SLinus Torvalds #include <linux/major.h> 26d6b29d7cSJens Axboe #include <linux/splice.h> 271da177e4SLinus Torvalds #include <linux/proc_fs.h> 281da177e4SLinus Torvalds #include <linux/stat.h> 291da177e4SLinus Torvalds #include <linux/fcntl.h> 301da177e4SLinus Torvalds #include <linux/net.h> 311da177e4SLinus Torvalds #include <linux/unistd.h> 321da177e4SLinus Torvalds #include <linux/slab.h> 331da177e4SLinus Torvalds #include <linux/pagemap.h> 341da177e4SLinus Torvalds #include <linux/in.h> 351da177e4SLinus Torvalds #include <linux/module.h> 361da177e4SLinus Torvalds #include <linux/namei.h> 371da177e4SLinus Torvalds #include <linux/vfs.h> 381da177e4SLinus Torvalds #include <linux/delay.h> 391da177e4SLinus Torvalds #include <linux/sunrpc/svc.h> 401da177e4SLinus Torvalds #include <linux/nfsd/nfsd.h> 411da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 421da177e4SLinus Torvalds #include <linux/nfs3.h> 431da177e4SLinus Torvalds #include <linux/nfsd/xdr3.h> 441da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 451da177e4SLinus Torvalds #include <linux/nfsd/nfsfh.h> 461da177e4SLinus Torvalds #include <linux/quotaops.h> 470eeca283SRobert Love #include <linux/fsnotify.h> 481da177e4SLinus Torvalds #include <linux/posix_acl.h> 491da177e4SLinus Torvalds #include <linux/posix_acl_xattr.h> 501da177e4SLinus Torvalds #include <linux/xattr.h> 515be196e5SChristoph Hellwig #ifdef CONFIG_NFSD_V4 521da177e4SLinus Torvalds #include <linux/nfs4.h> 531da177e4SLinus Torvalds #include <linux/nfs4_acl.h> 541da177e4SLinus Torvalds #include <linux/nfsd_idmap.h> 551da177e4SLinus Torvalds #include <linux/security.h> 561da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V4 */ 57fce1456aSGreg Banks #include <linux/jhash.h> 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds #include <asm/uaccess.h> 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds #define NFSDDBG_FACILITY NFSDDBG_FILEOP 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds /* 651da177e4SLinus Torvalds * This is a cache of readahead params that help us choose the proper 661da177e4SLinus Torvalds * readahead strategy. Initially, we set all readahead parameters to 0 671da177e4SLinus Torvalds * and let the VFS handle things. 681da177e4SLinus Torvalds * If you increase the number of cached files very much, you'll need to 691da177e4SLinus Torvalds * add a hash table here. 701da177e4SLinus Torvalds */ 711da177e4SLinus Torvalds struct raparms { 721da177e4SLinus Torvalds struct raparms *p_next; 731da177e4SLinus Torvalds unsigned int p_count; 741da177e4SLinus Torvalds ino_t p_ino; 751da177e4SLinus Torvalds dev_t p_dev; 761da177e4SLinus Torvalds int p_set; 771da177e4SLinus Torvalds struct file_ra_state p_ra; 78fce1456aSGreg Banks unsigned int p_hindex; 791da177e4SLinus Torvalds }; 801da177e4SLinus Torvalds 81fce1456aSGreg Banks struct raparm_hbucket { 82fce1456aSGreg Banks struct raparms *pb_head; 83fce1456aSGreg Banks spinlock_t pb_lock; 84fce1456aSGreg Banks } ____cacheline_aligned_in_smp; 85fce1456aSGreg Banks 861da177e4SLinus Torvalds static struct raparms * raparml; 87fce1456aSGreg Banks #define RAPARM_HASH_BITS 4 88fce1456aSGreg Banks #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) 89fce1456aSGreg Banks #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) 90fce1456aSGreg Banks static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds /* 931da177e4SLinus Torvalds * Called from nfsd_lookup and encode_dirent. Check if we have crossed 941da177e4SLinus Torvalds * a mount point. 95e0bb89efSJ.Bruce Fields * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, 961da177e4SLinus Torvalds * or nfs_ok having possibly changed *dpp and *expp 971da177e4SLinus Torvalds */ 981da177e4SLinus Torvalds int 991da177e4SLinus Torvalds nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 1001da177e4SLinus Torvalds struct svc_export **expp) 1011da177e4SLinus Torvalds { 1021da177e4SLinus Torvalds struct svc_export *exp = *expp, *exp2 = NULL; 1031da177e4SLinus Torvalds struct dentry *dentry = *dpp; 1041da177e4SLinus Torvalds struct vfsmount *mnt = mntget(exp->ex_mnt); 1051da177e4SLinus Torvalds struct dentry *mounts = dget(dentry); 1066264d69dSAl Viro int err = 0; 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts)); 1091da177e4SLinus Torvalds 1100989a788SJ. Bruce Fields exp2 = rqst_exp_get_by_name(rqstp, mnt, mounts); 1111da177e4SLinus Torvalds if (IS_ERR(exp2)) { 112a1033be7SNeil Brown if (PTR_ERR(exp2) != -ENOENT) 1131da177e4SLinus Torvalds err = PTR_ERR(exp2); 1141da177e4SLinus Torvalds dput(mounts); 1151da177e4SLinus Torvalds mntput(mnt); 1161da177e4SLinus Torvalds goto out; 1171da177e4SLinus Torvalds } 1185d3dbbeaSJ. Bruce Fields if ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { 1191da177e4SLinus Torvalds /* successfully crossed mount point */ 1201da177e4SLinus Torvalds exp_put(exp); 1211da177e4SLinus Torvalds *expp = exp2; 1221da177e4SLinus Torvalds dput(dentry); 1231da177e4SLinus Torvalds *dpp = mounts; 1241da177e4SLinus Torvalds } else { 1255d3dbbeaSJ. Bruce Fields exp_put(exp2); 1261da177e4SLinus Torvalds dput(mounts); 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds mntput(mnt); 1291da177e4SLinus Torvalds out: 1301da177e4SLinus Torvalds return err; 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds 1336264d69dSAl Viro __be32 1346c0a654dSJ. Bruce Fields nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, 1356c0a654dSJ. Bruce Fields const char *name, int len, 1366c0a654dSJ. Bruce Fields struct svc_export **exp_ret, struct dentry **dentry_ret) 1371da177e4SLinus Torvalds { 1381da177e4SLinus Torvalds struct svc_export *exp; 1391da177e4SLinus Torvalds struct dentry *dparent; 1401da177e4SLinus Torvalds struct dentry *dentry; 1416264d69dSAl Viro __be32 err; 1426264d69dSAl Viro int host_err; 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds /* Obtain dentry and export. */ 1471da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC); 1481da177e4SLinus Torvalds if (err) 1491da177e4SLinus Torvalds return err; 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds dparent = fhp->fh_dentry; 1521da177e4SLinus Torvalds exp = fhp->fh_export; 1531da177e4SLinus Torvalds exp_get(exp); 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds /* Lookup the name, but don't follow links */ 1561da177e4SLinus Torvalds if (isdotent(name, len)) { 1571da177e4SLinus Torvalds if (len==1) 1581da177e4SLinus Torvalds dentry = dget(dparent); 1591da177e4SLinus Torvalds else if (dparent != exp->ex_dentry) { 1601da177e4SLinus Torvalds dentry = dget_parent(dparent); 1611da177e4SLinus Torvalds } else if (!EX_NOHIDE(exp)) 1621da177e4SLinus Torvalds dentry = dget(dparent); /* .. == . just like at / */ 1631da177e4SLinus Torvalds else { 1641da177e4SLinus Torvalds /* checking mountpoint crossing is very different when stepping up */ 1651da177e4SLinus Torvalds struct svc_export *exp2 = NULL; 1661da177e4SLinus Torvalds struct dentry *dp; 1671da177e4SLinus Torvalds struct vfsmount *mnt = mntget(exp->ex_mnt); 1681da177e4SLinus Torvalds dentry = dget(dparent); 1691da177e4SLinus Torvalds while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry)) 1701da177e4SLinus Torvalds ; 1711da177e4SLinus Torvalds dp = dget_parent(dentry); 1721da177e4SLinus Torvalds dput(dentry); 1731da177e4SLinus Torvalds dentry = dp; 1741da177e4SLinus Torvalds 1750989a788SJ. Bruce Fields exp2 = rqst_exp_parent(rqstp, mnt, dentry); 1762d3bb252SJ. Bruce Fields if (PTR_ERR(exp2) == -ENOENT) { 1772d3bb252SJ. Bruce Fields dput(dentry); 1782d3bb252SJ. Bruce Fields dentry = dget(dparent); 1792d3bb252SJ. Bruce Fields } else if (IS_ERR(exp2)) { 1806264d69dSAl Viro host_err = PTR_ERR(exp2); 1811da177e4SLinus Torvalds dput(dentry); 1821da177e4SLinus Torvalds mntput(mnt); 1831da177e4SLinus Torvalds goto out_nfserr; 1841da177e4SLinus Torvalds } else { 1851da177e4SLinus Torvalds exp_put(exp); 1861da177e4SLinus Torvalds exp = exp2; 1871da177e4SLinus Torvalds } 1881da177e4SLinus Torvalds mntput(mnt); 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds } else { 1911da177e4SLinus Torvalds fh_lock(fhp); 1921da177e4SLinus Torvalds dentry = lookup_one_len(name, dparent, len); 1936264d69dSAl Viro host_err = PTR_ERR(dentry); 1941da177e4SLinus Torvalds if (IS_ERR(dentry)) 1951da177e4SLinus Torvalds goto out_nfserr; 1961da177e4SLinus Torvalds /* 1971da177e4SLinus Torvalds * check if we have crossed a mount point ... 1981da177e4SLinus Torvalds */ 1991da177e4SLinus Torvalds if (d_mountpoint(dentry)) { 2006264d69dSAl Viro if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 2011da177e4SLinus Torvalds dput(dentry); 2021da177e4SLinus Torvalds goto out_nfserr; 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds } 2051da177e4SLinus Torvalds } 2066c0a654dSJ. Bruce Fields *dentry_ret = dentry; 2076c0a654dSJ. Bruce Fields *exp_ret = exp; 2086c0a654dSJ. Bruce Fields return 0; 2096c0a654dSJ. Bruce Fields 2106c0a654dSJ. Bruce Fields out_nfserr: 2116c0a654dSJ. Bruce Fields exp_put(exp); 2126c0a654dSJ. Bruce Fields return nfserrno(host_err); 2136c0a654dSJ. Bruce Fields } 2146c0a654dSJ. Bruce Fields 2156c0a654dSJ. Bruce Fields /* 2166c0a654dSJ. Bruce Fields * Look up one component of a pathname. 2176c0a654dSJ. Bruce Fields * N.B. After this call _both_ fhp and resfh need an fh_put 2186c0a654dSJ. Bruce Fields * 2196c0a654dSJ. Bruce Fields * If the lookup would cross a mountpoint, and the mounted filesystem 2206c0a654dSJ. Bruce Fields * is exported to the client with NFSEXP_NOHIDE, then the lookup is 2216c0a654dSJ. Bruce Fields * accepted as it stands and the mounted directory is 2226c0a654dSJ. Bruce Fields * returned. Otherwise the covered directory is returned. 2236c0a654dSJ. Bruce Fields * NOTE: this mountpoint crossing is not supported properly by all 2246c0a654dSJ. Bruce Fields * clients and is explicitly disallowed for NFSv3 2256c0a654dSJ. Bruce Fields * NeilBrown <neilb@cse.unsw.edu.au> 2266c0a654dSJ. Bruce Fields */ 2276c0a654dSJ. Bruce Fields __be32 2286c0a654dSJ. Bruce Fields nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 2296c0a654dSJ. Bruce Fields int len, struct svc_fh *resfh) 2306c0a654dSJ. Bruce Fields { 2316c0a654dSJ. Bruce Fields struct svc_export *exp; 2326c0a654dSJ. Bruce Fields struct dentry *dentry; 2336c0a654dSJ. Bruce Fields __be32 err; 2346c0a654dSJ. Bruce Fields 2356c0a654dSJ. Bruce Fields err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); 2366c0a654dSJ. Bruce Fields if (err) 2376c0a654dSJ. Bruce Fields return err; 23832c1eb0cSAndy Adamson err = check_nfsd_access(exp, rqstp); 23932c1eb0cSAndy Adamson if (err) 24032c1eb0cSAndy Adamson goto out; 2411da177e4SLinus Torvalds /* 2421da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2431da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2441da177e4SLinus Torvalds */ 2451da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2461da177e4SLinus Torvalds if (!err && !dentry->d_inode) 2471da177e4SLinus Torvalds err = nfserr_noent; 24832c1eb0cSAndy Adamson out: 2491da177e4SLinus Torvalds dput(dentry); 2501da177e4SLinus Torvalds exp_put(exp); 2511da177e4SLinus Torvalds return err; 2521da177e4SLinus Torvalds } 2531da177e4SLinus Torvalds 2546c0a654dSJ. Bruce Fields 2551da177e4SLinus Torvalds /* 2561da177e4SLinus Torvalds * Set various file attributes. 2571da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 2581da177e4SLinus Torvalds */ 2596264d69dSAl Viro __be32 2601da177e4SLinus Torvalds nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 2611da177e4SLinus Torvalds int check_guard, time_t guardtime) 2621da177e4SLinus Torvalds { 2631da177e4SLinus Torvalds struct dentry *dentry; 2641da177e4SLinus Torvalds struct inode *inode; 2651da177e4SLinus Torvalds int accmode = MAY_SATTR; 2661da177e4SLinus Torvalds int ftype = 0; 2671da177e4SLinus Torvalds int imode; 2686264d69dSAl Viro __be32 err; 2696264d69dSAl Viro int host_err; 2701da177e4SLinus Torvalds int size_change = 0; 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) 2731da177e4SLinus Torvalds accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE; 2741da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) 2751da177e4SLinus Torvalds ftype = S_IFREG; 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds /* Get inode */ 2781da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 27915b7a1b8SNeilBrown if (err) 2801da177e4SLinus Torvalds goto out; 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds dentry = fhp->fh_dentry; 2831da177e4SLinus Torvalds inode = dentry->d_inode; 2841da177e4SLinus Torvalds 28515b7a1b8SNeilBrown /* Ignore any mode updates on symlinks */ 28615b7a1b8SNeilBrown if (S_ISLNK(inode->i_mode)) 28715b7a1b8SNeilBrown iap->ia_valid &= ~ATTR_MODE; 28815b7a1b8SNeilBrown 28915b7a1b8SNeilBrown if (!iap->ia_valid) 29015b7a1b8SNeilBrown goto out; 29115b7a1b8SNeilBrown 2921da177e4SLinus Torvalds /* NFSv2 does not differentiate between "set-[ac]time-to-now" 2931da177e4SLinus Torvalds * which only requires access, and "set-[ac]time-to-X" which 2941da177e4SLinus Torvalds * requires ownership. 2951da177e4SLinus Torvalds * So if it looks like it might be "set both to the same time which 2961da177e4SLinus Torvalds * is close to now", and if inode_change_ok fails, then we 2971da177e4SLinus Torvalds * convert to "set to now" instead of "set to explicit time" 2981da177e4SLinus Torvalds * 2991da177e4SLinus Torvalds * We only call inode_change_ok as the last test as technically 3001da177e4SLinus Torvalds * it is not an interface that we should be using. It is only 3011da177e4SLinus Torvalds * valid if the filesystem does not define it's own i_op->setattr. 3021da177e4SLinus Torvalds */ 3031da177e4SLinus Torvalds #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) 3041da177e4SLinus Torvalds #define MAX_TOUCH_TIME_ERROR (30*60) 3051da177e4SLinus Torvalds if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET 3061da177e4SLinus Torvalds && iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec 3071da177e4SLinus Torvalds ) { 3081da177e4SLinus Torvalds /* Looks probable. Now just make sure time is in the right ballpark. 3091da177e4SLinus Torvalds * Solaris, at least, doesn't seem to care what the time request is. 3101da177e4SLinus Torvalds * We require it be within 30 minutes of now. 3111da177e4SLinus Torvalds */ 3121da177e4SLinus Torvalds time_t delta = iap->ia_atime.tv_sec - get_seconds(); 3131da177e4SLinus Torvalds if (delta<0) delta = -delta; 3141da177e4SLinus Torvalds if (delta < MAX_TOUCH_TIME_ERROR && 3151da177e4SLinus Torvalds inode_change_ok(inode, iap) != 0) { 3161da177e4SLinus Torvalds /* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME 3171da177e4SLinus Torvalds * this will cause notify_change to set these times to "now" 3181da177e4SLinus Torvalds */ 3191da177e4SLinus Torvalds iap->ia_valid &= ~BOTH_TIME_SET; 3201da177e4SLinus Torvalds } 3211da177e4SLinus Torvalds } 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds /* The size case is special. It changes the file as well as the attributes. */ 3241da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) { 3251da177e4SLinus Torvalds if (iap->ia_size < inode->i_size) { 3260ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE); 3271da177e4SLinus Torvalds if (err) 3281da177e4SLinus Torvalds goto out; 3291da177e4SLinus Torvalds } 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds /* 3321da177e4SLinus Torvalds * If we are changing the size of the file, then 3331da177e4SLinus Torvalds * we need to break all leases. 3341da177e4SLinus Torvalds */ 3356264d69dSAl Viro host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK); 3366264d69dSAl Viro if (host_err == -EWOULDBLOCK) 3376264d69dSAl Viro host_err = -ETIMEDOUT; 3386264d69dSAl Viro if (host_err) /* ENOMEM or EWOULDBLOCK */ 3391da177e4SLinus Torvalds goto out_nfserr; 3401da177e4SLinus Torvalds 3416264d69dSAl Viro host_err = get_write_access(inode); 3426264d69dSAl Viro if (host_err) 3431da177e4SLinus Torvalds goto out_nfserr; 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds size_change = 1; 3466264d69dSAl Viro host_err = locks_verify_truncate(inode, NULL, iap->ia_size); 3476264d69dSAl Viro if (host_err) { 3481da177e4SLinus Torvalds put_write_access(inode); 3491da177e4SLinus Torvalds goto out_nfserr; 3501da177e4SLinus Torvalds } 3511da177e4SLinus Torvalds DQUOT_INIT(inode); 3521da177e4SLinus Torvalds } 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds imode = inode->i_mode; 3551da177e4SLinus Torvalds if (iap->ia_valid & ATTR_MODE) { 3561da177e4SLinus Torvalds iap->ia_mode &= S_IALLUGO; 3571da177e4SLinus Torvalds imode = iap->ia_mode |= (imode & ~S_IALLUGO); 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds /* Revoke setuid/setgid bit on chown/chgrp */ 3611da177e4SLinus Torvalds if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) 3621da177e4SLinus Torvalds iap->ia_valid |= ATTR_KILL_SUID; 3631da177e4SLinus Torvalds if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid) 3641da177e4SLinus Torvalds iap->ia_valid |= ATTR_KILL_SGID; 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds /* Change the attributes. */ 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvalds err = nfserr_notsync; 3711da177e4SLinus Torvalds if (!check_guard || guardtime == inode->i_ctime.tv_sec) { 3721da177e4SLinus Torvalds fh_lock(fhp); 3736264d69dSAl Viro host_err = notify_change(dentry, iap); 3746264d69dSAl Viro err = nfserrno(host_err); 3751da177e4SLinus Torvalds fh_unlock(fhp); 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds if (size_change) 3781da177e4SLinus Torvalds put_write_access(inode); 3791da177e4SLinus Torvalds if (!err) 3801da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 3811da177e4SLinus Torvalds write_inode_now(inode, 1); 3821da177e4SLinus Torvalds out: 3831da177e4SLinus Torvalds return err; 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds out_nfserr: 3866264d69dSAl Viro err = nfserrno(host_err); 3871da177e4SLinus Torvalds goto out; 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds 3905be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V2_ACL) || \ 3915be196e5SChristoph Hellwig defined(CONFIG_NFSD_V3_ACL) || \ 3925be196e5SChristoph Hellwig defined(CONFIG_NFSD_V4) 3935be196e5SChristoph Hellwig static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) 3945be196e5SChristoph Hellwig { 3955be196e5SChristoph Hellwig ssize_t buflen; 3961da177e4SLinus Torvalds 3975be196e5SChristoph Hellwig buflen = vfs_getxattr(dentry, key, NULL, 0); 3985be196e5SChristoph Hellwig if (buflen <= 0) 3995be196e5SChristoph Hellwig return buflen; 4005be196e5SChristoph Hellwig 4015be196e5SChristoph Hellwig *buf = kmalloc(buflen, GFP_KERNEL); 4025be196e5SChristoph Hellwig if (!*buf) 4035be196e5SChristoph Hellwig return -ENOMEM; 4045be196e5SChristoph Hellwig 405b5872b0dSNeilBrown return vfs_getxattr(dentry, key, *buf, buflen); 4065be196e5SChristoph Hellwig } 4075be196e5SChristoph Hellwig #endif 4085be196e5SChristoph Hellwig 4095be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V4) 4101da177e4SLinus Torvalds static int 4111da177e4SLinus Torvalds set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) 4121da177e4SLinus Torvalds { 4131da177e4SLinus Torvalds int len; 4141da177e4SLinus Torvalds size_t buflen; 4151da177e4SLinus Torvalds char *buf = NULL; 4161da177e4SLinus Torvalds int error = 0; 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds buflen = posix_acl_xattr_size(pacl->a_count); 4191da177e4SLinus Torvalds buf = kmalloc(buflen, GFP_KERNEL); 4201da177e4SLinus Torvalds error = -ENOMEM; 4211da177e4SLinus Torvalds if (buf == NULL) 4221da177e4SLinus Torvalds goto out; 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds len = posix_acl_to_xattr(pacl, buf, buflen); 4251da177e4SLinus Torvalds if (len < 0) { 4261da177e4SLinus Torvalds error = len; 4271da177e4SLinus Torvalds goto out; 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds 4305be196e5SChristoph Hellwig error = vfs_setxattr(dentry, key, buf, len, 0); 4311da177e4SLinus Torvalds out: 4321da177e4SLinus Torvalds kfree(buf); 4331da177e4SLinus Torvalds return error; 4341da177e4SLinus Torvalds } 4351da177e4SLinus Torvalds 4366264d69dSAl Viro __be32 4371da177e4SLinus Torvalds nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, 4381da177e4SLinus Torvalds struct nfs4_acl *acl) 4391da177e4SLinus Torvalds { 4406264d69dSAl Viro __be32 error; 4416264d69dSAl Viro int host_error; 4421da177e4SLinus Torvalds struct dentry *dentry; 4431da177e4SLinus Torvalds struct inode *inode; 4441da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 4451da177e4SLinus Torvalds unsigned int flags = 0; 4461da177e4SLinus Torvalds 4471da177e4SLinus Torvalds /* Get inode */ 4481da177e4SLinus Torvalds error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR); 4491da177e4SLinus Torvalds if (error) 4504b2ca38aSJ. Bruce Fields return error; 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds dentry = fhp->fh_dentry; 4531da177e4SLinus Torvalds inode = dentry->d_inode; 4541da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) 4551da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 4561da177e4SLinus Torvalds 4576264d69dSAl Viro host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); 4586264d69dSAl Viro if (host_error == -EINVAL) { 4594b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 4606264d69dSAl Viro } else if (host_error < 0) 4611da177e4SLinus Torvalds goto out_nfserr; 4621da177e4SLinus Torvalds 4636264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); 4646264d69dSAl Viro if (host_error < 0) 4654b2ca38aSJ. Bruce Fields goto out_release; 4661da177e4SLinus Torvalds 4674b2ca38aSJ. Bruce Fields if (S_ISDIR(inode->i_mode)) 4686264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); 4691da177e4SLinus Torvalds 4704b2ca38aSJ. Bruce Fields out_release: 4711da177e4SLinus Torvalds posix_acl_release(pacl); 4721da177e4SLinus Torvalds posix_acl_release(dpacl); 4731da177e4SLinus Torvalds out_nfserr: 474f34f9242SJ. Bruce Fields if (host_error == -EOPNOTSUPP) 4754b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 476f34f9242SJ. Bruce Fields else 4774b2ca38aSJ. Bruce Fields return nfserrno(host_error); 4781da177e4SLinus Torvalds } 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds static struct posix_acl * 4811da177e4SLinus Torvalds _get_posix_acl(struct dentry *dentry, char *key) 4821da177e4SLinus Torvalds { 4835be196e5SChristoph Hellwig void *buf = NULL; 4841da177e4SLinus Torvalds struct posix_acl *pacl = NULL; 4855be196e5SChristoph Hellwig int buflen; 4861da177e4SLinus Torvalds 4875be196e5SChristoph Hellwig buflen = nfsd_getxattr(dentry, key, &buf); 4885be196e5SChristoph Hellwig if (!buflen) 4895be196e5SChristoph Hellwig buflen = -ENODATA; 4905be196e5SChristoph Hellwig if (buflen <= 0) 4915be196e5SChristoph Hellwig return ERR_PTR(buflen); 4921da177e4SLinus Torvalds 4931da177e4SLinus Torvalds pacl = posix_acl_from_xattr(buf, buflen); 4941da177e4SLinus Torvalds kfree(buf); 4951da177e4SLinus Torvalds return pacl; 4961da177e4SLinus Torvalds } 4971da177e4SLinus Torvalds 4981da177e4SLinus Torvalds int 4991da177e4SLinus Torvalds nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) 5001da177e4SLinus Torvalds { 5011da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 5021da177e4SLinus Torvalds int error = 0; 5031da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 5041da177e4SLinus Torvalds unsigned int flags = 0; 5051da177e4SLinus Torvalds 5069a59f452SChristoph Hellwig pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); 5071da177e4SLinus Torvalds if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) 5081da177e4SLinus Torvalds pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 5091da177e4SLinus Torvalds if (IS_ERR(pacl)) { 5101da177e4SLinus Torvalds error = PTR_ERR(pacl); 5111da177e4SLinus Torvalds pacl = NULL; 5121da177e4SLinus Torvalds goto out; 5131da177e4SLinus Torvalds } 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) { 5169a59f452SChristoph Hellwig dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); 5171da177e4SLinus Torvalds if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) 5181da177e4SLinus Torvalds dpacl = NULL; 5191da177e4SLinus Torvalds else if (IS_ERR(dpacl)) { 5201da177e4SLinus Torvalds error = PTR_ERR(dpacl); 5211da177e4SLinus Torvalds dpacl = NULL; 5221da177e4SLinus Torvalds goto out; 5231da177e4SLinus Torvalds } 5241da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5251da177e4SLinus Torvalds } 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); 5281da177e4SLinus Torvalds if (IS_ERR(*acl)) { 5291da177e4SLinus Torvalds error = PTR_ERR(*acl); 5301da177e4SLinus Torvalds *acl = NULL; 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds out: 5331da177e4SLinus Torvalds posix_acl_release(pacl); 5341da177e4SLinus Torvalds posix_acl_release(dpacl); 5351da177e4SLinus Torvalds return error; 5361da177e4SLinus Torvalds } 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds #endif /* defined(CONFIG_NFS_V4) */ 5391da177e4SLinus Torvalds 5401da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 5411da177e4SLinus Torvalds /* 5421da177e4SLinus Torvalds * Check server access rights to a file system object 5431da177e4SLinus Torvalds */ 5441da177e4SLinus Torvalds struct accessmap { 5451da177e4SLinus Torvalds u32 access; 5461da177e4SLinus Torvalds int how; 5471da177e4SLinus Torvalds }; 5481da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 5491da177e4SLinus Torvalds { NFS3_ACCESS_READ, MAY_READ }, 5501da177e4SLinus Torvalds { NFS3_ACCESS_EXECUTE, MAY_EXEC }, 5511da177e4SLinus Torvalds { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_TRUNC }, 5521da177e4SLinus Torvalds { NFS3_ACCESS_EXTEND, MAY_WRITE }, 5531da177e4SLinus Torvalds 5541da177e4SLinus Torvalds { 0, 0 } 5551da177e4SLinus Torvalds }; 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 5581da177e4SLinus Torvalds { NFS3_ACCESS_READ, MAY_READ }, 5591da177e4SLinus Torvalds { NFS3_ACCESS_LOOKUP, MAY_EXEC }, 5601da177e4SLinus Torvalds { NFS3_ACCESS_MODIFY, MAY_EXEC|MAY_WRITE|MAY_TRUNC }, 5611da177e4SLinus Torvalds { NFS3_ACCESS_EXTEND, MAY_EXEC|MAY_WRITE }, 5621da177e4SLinus Torvalds { NFS3_ACCESS_DELETE, MAY_REMOVE }, 5631da177e4SLinus Torvalds 5641da177e4SLinus Torvalds { 0, 0 } 5651da177e4SLinus Torvalds }; 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 5681da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 5691da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 5701da177e4SLinus Torvalds * (which really, the server doesn't care about). So 5711da177e4SLinus Torvalds * We provide simple access checking for them, looking 5721da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 5731da177e4SLinus Torvalds * filesystem checks 5741da177e4SLinus Torvalds */ 5751da177e4SLinus Torvalds { NFS3_ACCESS_READ, MAY_READ }, 5761da177e4SLinus Torvalds { NFS3_ACCESS_EXECUTE, MAY_EXEC }, 5771da177e4SLinus Torvalds { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_LOCAL_ACCESS }, 5781da177e4SLinus Torvalds { NFS3_ACCESS_EXTEND, MAY_WRITE|MAY_LOCAL_ACCESS }, 5791da177e4SLinus Torvalds 5801da177e4SLinus Torvalds { 0, 0 } 5811da177e4SLinus Torvalds }; 5821da177e4SLinus Torvalds 5836264d69dSAl Viro __be32 5841da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 5851da177e4SLinus Torvalds { 5861da177e4SLinus Torvalds struct accessmap *map; 5871da177e4SLinus Torvalds struct svc_export *export; 5881da177e4SLinus Torvalds struct dentry *dentry; 5891da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 5906264d69dSAl Viro __be32 error; 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds error = fh_verify(rqstp, fhp, 0, MAY_NOP); 5931da177e4SLinus Torvalds if (error) 5941da177e4SLinus Torvalds goto out; 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds export = fhp->fh_export; 5971da177e4SLinus Torvalds dentry = fhp->fh_dentry; 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds if (S_ISREG(dentry->d_inode->i_mode)) 6001da177e4SLinus Torvalds map = nfs3_regaccess; 6011da177e4SLinus Torvalds else if (S_ISDIR(dentry->d_inode->i_mode)) 6021da177e4SLinus Torvalds map = nfs3_diraccess; 6031da177e4SLinus Torvalds else 6041da177e4SLinus Torvalds map = nfs3_anyaccess; 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvalds query = *access; 6081da177e4SLinus Torvalds for (; map->access; map++) { 6091da177e4SLinus Torvalds if (map->access & query) { 6106264d69dSAl Viro __be32 err2; 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds sresult |= map->access; 6131da177e4SLinus Torvalds 6140ec757dfSJ. Bruce Fields err2 = nfsd_permission(rqstp, export, dentry, map->how); 6151da177e4SLinus Torvalds switch (err2) { 6161da177e4SLinus Torvalds case nfs_ok: 6171da177e4SLinus Torvalds result |= map->access; 6181da177e4SLinus Torvalds break; 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 6211da177e4SLinus Torvalds * rather than an error occurred */ 6221da177e4SLinus Torvalds case nfserr_rofs: 6231da177e4SLinus Torvalds case nfserr_acces: 6241da177e4SLinus Torvalds case nfserr_perm: 6251da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 6261da177e4SLinus Torvalds break; 6271da177e4SLinus Torvalds default: 6281da177e4SLinus Torvalds error = err2; 6291da177e4SLinus Torvalds goto out; 6301da177e4SLinus Torvalds } 6311da177e4SLinus Torvalds } 6321da177e4SLinus Torvalds } 6331da177e4SLinus Torvalds *access = result; 6341da177e4SLinus Torvalds if (supported) 6351da177e4SLinus Torvalds *supported = sresult; 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds out: 6381da177e4SLinus Torvalds return error; 6391da177e4SLinus Torvalds } 6401da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds 6441da177e4SLinus Torvalds /* 6451da177e4SLinus Torvalds * Open an existing file or directory. 6461da177e4SLinus Torvalds * The access argument indicates the type of open (read/write/lock) 6471da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 6481da177e4SLinus Torvalds */ 6496264d69dSAl Viro __be32 6501da177e4SLinus Torvalds nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 6511da177e4SLinus Torvalds int access, struct file **filp) 6521da177e4SLinus Torvalds { 6531da177e4SLinus Torvalds struct dentry *dentry; 6541da177e4SLinus Torvalds struct inode *inode; 6556264d69dSAl Viro int flags = O_RDONLY|O_LARGEFILE; 6566264d69dSAl Viro __be32 err; 6576264d69dSAl Viro int host_err; 6581da177e4SLinus Torvalds 6591da177e4SLinus Torvalds /* 6601da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 6611da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 6621da177e4SLinus Torvalds * in case a chmod has now revoked permission. 6631da177e4SLinus Torvalds */ 6641da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE); 6651da177e4SLinus Torvalds if (err) 6661da177e4SLinus Torvalds goto out; 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6691da177e4SLinus Torvalds inode = dentry->d_inode; 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 6721da177e4SLinus Torvalds * or any access when mandatory locking enabled 6731da177e4SLinus Torvalds */ 6741da177e4SLinus Torvalds err = nfserr_perm; 6751da177e4SLinus Torvalds if (IS_APPEND(inode) && (access & MAY_WRITE)) 6761da177e4SLinus Torvalds goto out; 677*5e7fc436SJ. Bruce Fields /* 678*5e7fc436SJ. Bruce Fields * We must ignore files (but only files) which might have mandatory 679*5e7fc436SJ. Bruce Fields * locks on them because there is no way to know if the accesser has 680*5e7fc436SJ. Bruce Fields * the lock. 681*5e7fc436SJ. Bruce Fields */ 682*5e7fc436SJ. Bruce Fields if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) 6831da177e4SLinus Torvalds goto out; 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds if (!inode->i_fop) 6861da177e4SLinus Torvalds goto out; 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds /* 6891da177e4SLinus Torvalds * Check to see if there are any leases on this file. 6901da177e4SLinus Torvalds * This may block while leases are broken. 6911da177e4SLinus Torvalds */ 6926264d69dSAl Viro host_err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0)); 6936264d69dSAl Viro if (host_err == -EWOULDBLOCK) 6946264d69dSAl Viro host_err = -ETIMEDOUT; 6956264d69dSAl Viro if (host_err) /* NOMEM or WOULDBLOCK */ 6961da177e4SLinus Torvalds goto out_nfserr; 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds if (access & MAY_WRITE) { 6999ecb6a08SJ. Bruce Fields if (access & MAY_READ) 7009ecb6a08SJ. Bruce Fields flags = O_RDWR|O_LARGEFILE; 7019ecb6a08SJ. Bruce Fields else 7021da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds DQUOT_INIT(inode); 7051da177e4SLinus Torvalds } 7061da177e4SLinus Torvalds *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags); 7071da177e4SLinus Torvalds if (IS_ERR(*filp)) 7086264d69dSAl Viro host_err = PTR_ERR(*filp); 7091da177e4SLinus Torvalds out_nfserr: 7106264d69dSAl Viro err = nfserrno(host_err); 7111da177e4SLinus Torvalds out: 7121da177e4SLinus Torvalds return err; 7131da177e4SLinus Torvalds } 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds /* 7161da177e4SLinus Torvalds * Close a file. 7171da177e4SLinus Torvalds */ 7181da177e4SLinus Torvalds void 7191da177e4SLinus Torvalds nfsd_close(struct file *filp) 7201da177e4SLinus Torvalds { 7211da177e4SLinus Torvalds fput(filp); 7221da177e4SLinus Torvalds } 7231da177e4SLinus Torvalds 7241da177e4SLinus Torvalds /* 7251da177e4SLinus Torvalds * Sync a file 7261da177e4SLinus Torvalds * As this calls fsync (not fdatasync) there is no need for a write_inode 7271da177e4SLinus Torvalds * after it. 7281da177e4SLinus Torvalds */ 729a334de28SDavid Shaw static inline int nfsd_dosync(struct file *filp, struct dentry *dp, 73099ac48f5SArjan van de Ven const struct file_operations *fop) 7311da177e4SLinus Torvalds { 7321da177e4SLinus Torvalds struct inode *inode = dp->d_inode; 7331da177e4SLinus Torvalds int (*fsync) (struct file *, struct dentry *, int); 734f193fbabSYAMAMOTO Takashi int err; 7351da177e4SLinus Torvalds 736f193fbabSYAMAMOTO Takashi err = filemap_fdatawrite(inode->i_mapping); 737f193fbabSYAMAMOTO Takashi if (err == 0 && fop && (fsync = fop->fsync)) 738a334de28SDavid Shaw err = fsync(filp, dp, 0); 739f193fbabSYAMAMOTO Takashi if (err == 0) 740f193fbabSYAMAMOTO Takashi err = filemap_fdatawait(inode->i_mapping); 741a334de28SDavid Shaw 742f193fbabSYAMAMOTO Takashi return err; 7431da177e4SLinus Torvalds } 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvalds 746a334de28SDavid Shaw static int 7471da177e4SLinus Torvalds nfsd_sync(struct file *filp) 7481da177e4SLinus Torvalds { 749a334de28SDavid Shaw int err; 7507eaa36e2SJosef "Jeff" Sipek struct inode *inode = filp->f_path.dentry->d_inode; 7517eaa36e2SJosef "Jeff" Sipek dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name); 7521b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 7537eaa36e2SJosef "Jeff" Sipek err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op); 7541b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 755a334de28SDavid Shaw 756a334de28SDavid Shaw return err; 7571da177e4SLinus Torvalds } 7581da177e4SLinus Torvalds 759f193fbabSYAMAMOTO Takashi int 7601da177e4SLinus Torvalds nfsd_sync_dir(struct dentry *dp) 7611da177e4SLinus Torvalds { 762f193fbabSYAMAMOTO Takashi return nfsd_dosync(NULL, dp, dp->d_inode->i_fop); 7631da177e4SLinus Torvalds } 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds /* 7661da177e4SLinus Torvalds * Obtain the readahead parameters for the file 7671da177e4SLinus Torvalds * specified by (dev, ino). 7681da177e4SLinus Torvalds */ 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvalds static inline struct raparms * 7711da177e4SLinus Torvalds nfsd_get_raparms(dev_t dev, ino_t ino) 7721da177e4SLinus Torvalds { 7731da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 7741da177e4SLinus Torvalds int depth = 0; 775fce1456aSGreg Banks unsigned int hash; 776fce1456aSGreg Banks struct raparm_hbucket *rab; 7771da177e4SLinus Torvalds 778fce1456aSGreg Banks hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; 779fce1456aSGreg Banks rab = &raparm_hash[hash]; 780fce1456aSGreg Banks 781fce1456aSGreg Banks spin_lock(&rab->pb_lock); 782fce1456aSGreg Banks for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { 7831da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 7841da177e4SLinus Torvalds goto found; 7851da177e4SLinus Torvalds depth++; 7861da177e4SLinus Torvalds if (ra->p_count == 0) 7871da177e4SLinus Torvalds frap = rap; 7881da177e4SLinus Torvalds } 7891da177e4SLinus Torvalds depth = nfsdstats.ra_size*11/10; 7901da177e4SLinus Torvalds if (!frap) { 791fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 7921da177e4SLinus Torvalds return NULL; 7931da177e4SLinus Torvalds } 7941da177e4SLinus Torvalds rap = frap; 7951da177e4SLinus Torvalds ra = *frap; 7961da177e4SLinus Torvalds ra->p_dev = dev; 7971da177e4SLinus Torvalds ra->p_ino = ino; 7981da177e4SLinus Torvalds ra->p_set = 0; 799fce1456aSGreg Banks ra->p_hindex = hash; 8001da177e4SLinus Torvalds found: 801fce1456aSGreg Banks if (rap != &rab->pb_head) { 8021da177e4SLinus Torvalds *rap = ra->p_next; 803fce1456aSGreg Banks ra->p_next = rab->pb_head; 804fce1456aSGreg Banks rab->pb_head = ra; 8051da177e4SLinus Torvalds } 8061da177e4SLinus Torvalds ra->p_count++; 8071da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 808fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8091da177e4SLinus Torvalds return ra; 8101da177e4SLinus Torvalds } 8111da177e4SLinus Torvalds 8121da177e4SLinus Torvalds /* 813cf8208d0SJens Axboe * Grab and keep cached pages associated with a file in the svc_rqst 814cf8208d0SJens Axboe * so that they can be passed to the network sendmsg/sendpage routines 815cf8208d0SJens Axboe * directly. They will be released after the sending has completed. 8161da177e4SLinus Torvalds */ 8171da177e4SLinus Torvalds static int 818cf8208d0SJens Axboe nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, 819cf8208d0SJens Axboe struct splice_desc *sd) 8201da177e4SLinus Torvalds { 821cf8208d0SJens Axboe struct svc_rqst *rqstp = sd->u.data; 82244524359SNeilBrown struct page **pp = rqstp->rq_respages + rqstp->rq_resused; 823cf8208d0SJens Axboe struct page *page = buf->page; 824cf8208d0SJens Axboe size_t size; 825cf8208d0SJens Axboe int ret; 8261da177e4SLinus Torvalds 827cac36bb0SJens Axboe ret = buf->ops->confirm(pipe, buf); 828cf8208d0SJens Axboe if (unlikely(ret)) 829cf8208d0SJens Axboe return ret; 830cf8208d0SJens Axboe 831cf8208d0SJens Axboe size = sd->len; 8321da177e4SLinus Torvalds 8331da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 8341da177e4SLinus Torvalds get_page(page); 83544524359SNeilBrown put_page(*pp); 83644524359SNeilBrown *pp = page; 83744524359SNeilBrown rqstp->rq_resused++; 838cf8208d0SJens Axboe rqstp->rq_res.page_base = buf->offset; 8391da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 84044524359SNeilBrown } else if (page != pp[-1]) { 8411da177e4SLinus Torvalds get_page(page); 842250f3915SNeilBrown if (*pp) 84344524359SNeilBrown put_page(*pp); 84444524359SNeilBrown *pp = page; 84544524359SNeilBrown rqstp->rq_resused++; 8461da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 84744524359SNeilBrown } else 8481da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8491da177e4SLinus Torvalds 8501da177e4SLinus Torvalds return size; 8511da177e4SLinus Torvalds } 8521da177e4SLinus Torvalds 853cf8208d0SJens Axboe static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, 854cf8208d0SJens Axboe struct splice_desc *sd) 855cf8208d0SJens Axboe { 856cf8208d0SJens Axboe return __splice_from_pipe(pipe, sd, nfsd_splice_actor); 857cf8208d0SJens Axboe } 858cf8208d0SJens Axboe 8596264d69dSAl Viro static __be32 8601da177e4SLinus Torvalds nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 8611da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 8621da177e4SLinus Torvalds { 8631da177e4SLinus Torvalds struct inode *inode; 8641da177e4SLinus Torvalds struct raparms *ra; 8651da177e4SLinus Torvalds mm_segment_t oldfs; 8666264d69dSAl Viro __be32 err; 8676264d69dSAl Viro int host_err; 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds err = nfserr_perm; 8707eaa36e2SJosef "Jeff" Sipek inode = file->f_path.dentry->d_inode; 8711da177e4SLinus Torvalds #ifdef MSNFS 8721da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 8731da177e4SLinus Torvalds (!lock_may_read(inode, offset, *count))) 8741da177e4SLinus Torvalds goto out; 8751da177e4SLinus Torvalds #endif 8761da177e4SLinus Torvalds 8771da177e4SLinus Torvalds /* Get readahead parameters */ 8781da177e4SLinus Torvalds ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); 8791da177e4SLinus Torvalds 8801da177e4SLinus Torvalds if (ra && ra->p_set) 8811da177e4SLinus Torvalds file->f_ra = ra->p_ra; 8821da177e4SLinus Torvalds 883cf8208d0SJens Axboe if (file->f_op->splice_read && rqstp->rq_splice_ok) { 884cf8208d0SJens Axboe struct splice_desc sd = { 885cf8208d0SJens Axboe .len = 0, 886cf8208d0SJens Axboe .total_len = *count, 887cf8208d0SJens Axboe .pos = offset, 888cf8208d0SJens Axboe .u.data = rqstp, 889cf8208d0SJens Axboe }; 890cf8208d0SJens Axboe 8914fbef206SJens Axboe rqstp->rq_resused = 1; 892cf8208d0SJens Axboe host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); 8931da177e4SLinus Torvalds } else { 8941da177e4SLinus Torvalds oldfs = get_fs(); 8951da177e4SLinus Torvalds set_fs(KERNEL_DS); 8966264d69dSAl Viro host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); 8971da177e4SLinus Torvalds set_fs(oldfs); 8981da177e4SLinus Torvalds } 8991da177e4SLinus Torvalds 9001da177e4SLinus Torvalds /* Write back readahead params */ 9011da177e4SLinus Torvalds if (ra) { 902fce1456aSGreg Banks struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; 903fce1456aSGreg Banks spin_lock(&rab->pb_lock); 9041da177e4SLinus Torvalds ra->p_ra = file->f_ra; 9051da177e4SLinus Torvalds ra->p_set = 1; 9061da177e4SLinus Torvalds ra->p_count--; 907fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 9081da177e4SLinus Torvalds } 9091da177e4SLinus Torvalds 9106264d69dSAl Viro if (host_err >= 0) { 9116264d69dSAl Viro nfsdstats.io_read += host_err; 9126264d69dSAl Viro *count = host_err; 9131da177e4SLinus Torvalds err = 0; 9147eaa36e2SJosef "Jeff" Sipek fsnotify_access(file->f_path.dentry); 9151da177e4SLinus Torvalds } else 9166264d69dSAl Viro err = nfserrno(host_err); 9171da177e4SLinus Torvalds out: 9181da177e4SLinus Torvalds return err; 9191da177e4SLinus Torvalds } 9201da177e4SLinus Torvalds 9219f708e40SNeil Brown static void kill_suid(struct dentry *dentry) 9229f708e40SNeil Brown { 9239f708e40SNeil Brown struct iattr ia; 9249f708e40SNeil Brown ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID; 9259f708e40SNeil Brown 9261b1dcc1bSJes Sorensen mutex_lock(&dentry->d_inode->i_mutex); 9279f708e40SNeil Brown notify_change(dentry, &ia); 9281b1dcc1bSJes Sorensen mutex_unlock(&dentry->d_inode->i_mutex); 9299f708e40SNeil Brown } 9309f708e40SNeil Brown 9316264d69dSAl Viro static __be32 9321da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 9331da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 9341da177e4SLinus Torvalds unsigned long cnt, int *stablep) 9351da177e4SLinus Torvalds { 9361da177e4SLinus Torvalds struct svc_export *exp; 9371da177e4SLinus Torvalds struct dentry *dentry; 9381da177e4SLinus Torvalds struct inode *inode; 9391da177e4SLinus Torvalds mm_segment_t oldfs; 9406264d69dSAl Viro __be32 err = 0; 9416264d69dSAl Viro int host_err; 9421da177e4SLinus Torvalds int stable = *stablep; 9431da177e4SLinus Torvalds 94445bd3b3dSNeilBrown #ifdef MSNFS 9451da177e4SLinus Torvalds err = nfserr_perm; 9461da177e4SLinus Torvalds 9471da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 9487eaa36e2SJosef "Jeff" Sipek (!lock_may_write(file->f_path.dentry->d_inode, offset, cnt))) 9491da177e4SLinus Torvalds goto out; 9501da177e4SLinus Torvalds #endif 9511da177e4SLinus Torvalds 9527eaa36e2SJosef "Jeff" Sipek dentry = file->f_path.dentry; 9531da177e4SLinus Torvalds inode = dentry->d_inode; 9541da177e4SLinus Torvalds exp = fhp->fh_export; 9551da177e4SLinus Torvalds 9561da177e4SLinus Torvalds /* 9571da177e4SLinus Torvalds * Request sync writes if 9581da177e4SLinus Torvalds * - the sync export option has been set, or 9591da177e4SLinus Torvalds * - the client requested O_SYNC behavior (NFSv3 feature). 9601da177e4SLinus Torvalds * - The file system doesn't support fsync(). 9611da177e4SLinus Torvalds * When gathered writes have been configured for this volume, 9621da177e4SLinus Torvalds * flushing the data to disk is handled separately below. 9631da177e4SLinus Torvalds */ 9641da177e4SLinus Torvalds 9651da177e4SLinus Torvalds if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */ 9661da177e4SLinus Torvalds stable = 2; 9671da177e4SLinus Torvalds *stablep = 2; /* FILE_SYNC */ 9681da177e4SLinus Torvalds } 9691da177e4SLinus Torvalds 9701da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 9711da177e4SLinus Torvalds stable = 0; 9721da177e4SLinus Torvalds if (stable && !EX_WGATHER(exp)) 9731da177e4SLinus Torvalds file->f_flags |= O_SYNC; 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds /* Write the data. */ 9761da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 9776264d69dSAl Viro host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); 9781da177e4SLinus Torvalds set_fs(oldfs); 9796264d69dSAl Viro if (host_err >= 0) { 9801da177e4SLinus Torvalds nfsdstats.io_write += cnt; 9817eaa36e2SJosef "Jeff" Sipek fsnotify_modify(file->f_path.dentry); 9821da177e4SLinus Torvalds } 9831da177e4SLinus Torvalds 9841da177e4SLinus Torvalds /* clear setuid/setgid flag after write */ 9856264d69dSAl Viro if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) 9869f708e40SNeil Brown kill_suid(dentry); 9871da177e4SLinus Torvalds 9886264d69dSAl Viro if (host_err >= 0 && stable) { 9891da177e4SLinus Torvalds static ino_t last_ino; 9901da177e4SLinus Torvalds static dev_t last_dev; 9911da177e4SLinus Torvalds 9921da177e4SLinus Torvalds /* 9931da177e4SLinus Torvalds * Gathered writes: If another process is currently 9941da177e4SLinus Torvalds * writing to the file, there's a high chance 9951da177e4SLinus Torvalds * this is another nfsd (triggered by a bulk write 9961da177e4SLinus Torvalds * from a client's biod). Rather than syncing the 9971da177e4SLinus Torvalds * file with each write request, we sleep for 10 msec. 9981da177e4SLinus Torvalds * 9991da177e4SLinus Torvalds * I don't know if this roughly approximates 10001da177e4SLinus Torvalds * C. Juszak's idea of gathered writes, but it's a 10011da177e4SLinus Torvalds * nice and simple solution (IMHO), and it seems to 10021da177e4SLinus Torvalds * work:-) 10031da177e4SLinus Torvalds */ 10041da177e4SLinus Torvalds if (EX_WGATHER(exp)) { 10051da177e4SLinus Torvalds if (atomic_read(&inode->i_writecount) > 1 10061da177e4SLinus Torvalds || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 10071da177e4SLinus Torvalds dprintk("nfsd: write defer %d\n", current->pid); 10081da177e4SLinus Torvalds msleep(10); 10091da177e4SLinus Torvalds dprintk("nfsd: write resume %d\n", current->pid); 10101da177e4SLinus Torvalds } 10111da177e4SLinus Torvalds 10121da177e4SLinus Torvalds if (inode->i_state & I_DIRTY) { 10131da177e4SLinus Torvalds dprintk("nfsd: write sync %d\n", current->pid); 10146264d69dSAl Viro host_err=nfsd_sync(file); 10151da177e4SLinus Torvalds } 10161da177e4SLinus Torvalds #if 0 10171da177e4SLinus Torvalds wake_up(&inode->i_wait); 10181da177e4SLinus Torvalds #endif 10191da177e4SLinus Torvalds } 10201da177e4SLinus Torvalds last_ino = inode->i_ino; 10211da177e4SLinus Torvalds last_dev = inode->i_sb->s_dev; 10221da177e4SLinus Torvalds } 10231da177e4SLinus Torvalds 10246264d69dSAl Viro dprintk("nfsd: write complete host_err=%d\n", host_err); 10256264d69dSAl Viro if (host_err >= 0) 10261da177e4SLinus Torvalds err = 0; 10271da177e4SLinus Torvalds else 10286264d69dSAl Viro err = nfserrno(host_err); 10291da177e4SLinus Torvalds out: 10301da177e4SLinus Torvalds return err; 10311da177e4SLinus Torvalds } 10321da177e4SLinus Torvalds 10331da177e4SLinus Torvalds /* 10341da177e4SLinus Torvalds * Read data from a file. count must contain the requested read count 10351da177e4SLinus Torvalds * on entry. On return, *count contains the number of bytes actually read. 10361da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10371da177e4SLinus Torvalds */ 10386264d69dSAl Viro __be32 10391da177e4SLinus Torvalds nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10401da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 10411da177e4SLinus Torvalds unsigned long *count) 10421da177e4SLinus Torvalds { 10436264d69dSAl Viro __be32 err; 10441da177e4SLinus Torvalds 10451da177e4SLinus Torvalds if (file) { 10460ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 10471da177e4SLinus Torvalds MAY_READ|MAY_OWNER_OVERRIDE); 10481da177e4SLinus Torvalds if (err) 10491da177e4SLinus Torvalds goto out; 10501da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 10511da177e4SLinus Torvalds } else { 10521da177e4SLinus Torvalds err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file); 10531da177e4SLinus Torvalds if (err) 10541da177e4SLinus Torvalds goto out; 10551da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 10561da177e4SLinus Torvalds nfsd_close(file); 10571da177e4SLinus Torvalds } 10581da177e4SLinus Torvalds out: 10591da177e4SLinus Torvalds return err; 10601da177e4SLinus Torvalds } 10611da177e4SLinus Torvalds 10621da177e4SLinus Torvalds /* 10631da177e4SLinus Torvalds * Write data to a file. 10641da177e4SLinus Torvalds * The stable flag requests synchronous writes. 10651da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10661da177e4SLinus Torvalds */ 10676264d69dSAl Viro __be32 10681da177e4SLinus Torvalds nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10691da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long cnt, 10701da177e4SLinus Torvalds int *stablep) 10711da177e4SLinus Torvalds { 10726264d69dSAl Viro __be32 err = 0; 10731da177e4SLinus Torvalds 10741da177e4SLinus Torvalds if (file) { 10750ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 10761da177e4SLinus Torvalds MAY_WRITE|MAY_OWNER_OVERRIDE); 10771da177e4SLinus Torvalds if (err) 10781da177e4SLinus Torvalds goto out; 10791da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, 10801da177e4SLinus Torvalds stablep); 10811da177e4SLinus Torvalds } else { 10821da177e4SLinus Torvalds err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file); 10831da177e4SLinus Torvalds if (err) 10841da177e4SLinus Torvalds goto out; 10851da177e4SLinus Torvalds 10861da177e4SLinus Torvalds if (cnt) 10871da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, 10881da177e4SLinus Torvalds cnt, stablep); 10891da177e4SLinus Torvalds nfsd_close(file); 10901da177e4SLinus Torvalds } 10911da177e4SLinus Torvalds out: 10921da177e4SLinus Torvalds return err; 10931da177e4SLinus Torvalds } 10941da177e4SLinus Torvalds 10951da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 10961da177e4SLinus Torvalds /* 10971da177e4SLinus Torvalds * Commit all pending writes to stable storage. 10981da177e4SLinus Torvalds * Strictly speaking, we could sync just the indicated file region here, 10991da177e4SLinus Torvalds * but there's currently no way we can ask the VFS to do so. 11001da177e4SLinus Torvalds * 11011da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 11021da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 11031da177e4SLinus Torvalds */ 11046264d69dSAl Viro __be32 11051da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 11061da177e4SLinus Torvalds loff_t offset, unsigned long count) 11071da177e4SLinus Torvalds { 11081da177e4SLinus Torvalds struct file *file; 11096264d69dSAl Viro __be32 err; 11101da177e4SLinus Torvalds 11111da177e4SLinus Torvalds if ((u64)count > ~(u64)offset) 11121da177e4SLinus Torvalds return nfserr_inval; 11131da177e4SLinus Torvalds 11141da177e4SLinus Torvalds if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0) 11151da177e4SLinus Torvalds return err; 11161da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 11171da177e4SLinus Torvalds if (file->f_op && file->f_op->fsync) { 111845bd3b3dSNeilBrown err = nfserrno(nfsd_sync(file)); 11191da177e4SLinus Torvalds } else { 11201da177e4SLinus Torvalds err = nfserr_notsupp; 11211da177e4SLinus Torvalds } 11221da177e4SLinus Torvalds } 11231da177e4SLinus Torvalds 11241da177e4SLinus Torvalds nfsd_close(file); 11251da177e4SLinus Torvalds return err; 11261da177e4SLinus Torvalds } 11271da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 11281da177e4SLinus Torvalds 11291da177e4SLinus Torvalds /* 11301da177e4SLinus Torvalds * Create a file (regular, directory, device, fifo); UNIX sockets 11311da177e4SLinus Torvalds * not yet implemented. 11321da177e4SLinus Torvalds * If the response fh has been verified, the parent directory should 11331da177e4SLinus Torvalds * already be locked. Note that the parent directory is left locked. 11341da177e4SLinus Torvalds * 11351da177e4SLinus Torvalds * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 11361da177e4SLinus Torvalds */ 11376264d69dSAl Viro __be32 11381da177e4SLinus Torvalds nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 11391da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 11401da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 11411da177e4SLinus Torvalds { 11421da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 11431da177e4SLinus Torvalds struct inode *dirp; 11446264d69dSAl Viro __be32 err; 11456264d69dSAl Viro int host_err; 11461da177e4SLinus Torvalds 11471da177e4SLinus Torvalds err = nfserr_perm; 11481da177e4SLinus Torvalds if (!flen) 11491da177e4SLinus Torvalds goto out; 11501da177e4SLinus Torvalds err = nfserr_exist; 11511da177e4SLinus Torvalds if (isdotent(fname, flen)) 11521da177e4SLinus Torvalds goto out; 11531da177e4SLinus Torvalds 11541da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); 11551da177e4SLinus Torvalds if (err) 11561da177e4SLinus Torvalds goto out; 11571da177e4SLinus Torvalds 11581da177e4SLinus Torvalds dentry = fhp->fh_dentry; 11591da177e4SLinus Torvalds dirp = dentry->d_inode; 11601da177e4SLinus Torvalds 11611da177e4SLinus Torvalds err = nfserr_notdir; 11621da177e4SLinus Torvalds if(!dirp->i_op || !dirp->i_op->lookup) 11631da177e4SLinus Torvalds goto out; 11641da177e4SLinus Torvalds /* 11651da177e4SLinus Torvalds * Check whether the response file handle has been verified yet. 11661da177e4SLinus Torvalds * If it has, the parent directory should already be locked. 11671da177e4SLinus Torvalds */ 11681da177e4SLinus Torvalds if (!resfhp->fh_dentry) { 11691da177e4SLinus Torvalds /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ 117012fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 11711da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 11726264d69dSAl Viro host_err = PTR_ERR(dchild); 11731da177e4SLinus Torvalds if (IS_ERR(dchild)) 11741da177e4SLinus Torvalds goto out_nfserr; 11751da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 11761da177e4SLinus Torvalds if (err) 11771da177e4SLinus Torvalds goto out; 11781da177e4SLinus Torvalds } else { 11791da177e4SLinus Torvalds /* called from nfsd_proc_create */ 11801da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 11811da177e4SLinus Torvalds if (!fhp->fh_locked) { 11821da177e4SLinus Torvalds /* not actually possible */ 11831da177e4SLinus Torvalds printk(KERN_ERR 11841da177e4SLinus Torvalds "nfsd_create: parent %s/%s not locked!\n", 11851da177e4SLinus Torvalds dentry->d_parent->d_name.name, 11861da177e4SLinus Torvalds dentry->d_name.name); 1187d75f2b9fSAl Viro err = nfserr_io; 11881da177e4SLinus Torvalds goto out; 11891da177e4SLinus Torvalds } 11901da177e4SLinus Torvalds } 11911da177e4SLinus Torvalds /* 11921da177e4SLinus Torvalds * Make sure the child dentry is still negative ... 11931da177e4SLinus Torvalds */ 11941da177e4SLinus Torvalds err = nfserr_exist; 11951da177e4SLinus Torvalds if (dchild->d_inode) { 11961da177e4SLinus Torvalds dprintk("nfsd_create: dentry %s/%s not negative!\n", 11971da177e4SLinus Torvalds dentry->d_name.name, dchild->d_name.name); 11981da177e4SLinus Torvalds goto out; 11991da177e4SLinus Torvalds } 12001da177e4SLinus Torvalds 12011da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 12021da177e4SLinus Torvalds iap->ia_mode = 0; 12031da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 12041da177e4SLinus Torvalds 12051da177e4SLinus Torvalds /* 12061da177e4SLinus Torvalds * Get the dir op function pointer. 12071da177e4SLinus Torvalds */ 1208088406bcSJ. Bruce Fields err = 0; 12091da177e4SLinus Torvalds switch (type) { 12101da177e4SLinus Torvalds case S_IFREG: 12116264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 12121da177e4SLinus Torvalds break; 12131da177e4SLinus Torvalds case S_IFDIR: 12146264d69dSAl Viro host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); 12151da177e4SLinus Torvalds break; 12161da177e4SLinus Torvalds case S_IFCHR: 12171da177e4SLinus Torvalds case S_IFBLK: 12181da177e4SLinus Torvalds case S_IFIFO: 12191da177e4SLinus Torvalds case S_IFSOCK: 12206264d69dSAl Viro host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 12211da177e4SLinus Torvalds break; 12221da177e4SLinus Torvalds default: 12231da177e4SLinus Torvalds printk("nfsd: bad file type %o in nfsd_create\n", type); 12246264d69dSAl Viro host_err = -EINVAL; 12251da177e4SLinus Torvalds } 12266264d69dSAl Viro if (host_err < 0) 12271da177e4SLinus Torvalds goto out_nfserr; 12281da177e4SLinus Torvalds 12291da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 123045bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(dentry)); 12311da177e4SLinus Torvalds write_inode_now(dchild->d_inode, 1); 12321da177e4SLinus Torvalds } 12331da177e4SLinus Torvalds 12341da177e4SLinus Torvalds 12351da177e4SLinus Torvalds /* Set file attributes. Mode has already been set and 12361da177e4SLinus Torvalds * setting uid/gid works only for root. Irix appears to 12371da177e4SLinus Torvalds * send along the gid when it tries to implement setgid 12381da177e4SLinus Torvalds * directories via NFS. 12391da177e4SLinus Torvalds */ 1240f193fbabSYAMAMOTO Takashi if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) { 12416264d69dSAl Viro __be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 1242f193fbabSYAMAMOTO Takashi if (err2) 1243f193fbabSYAMAMOTO Takashi err = err2; 1244f193fbabSYAMAMOTO Takashi } 12451da177e4SLinus Torvalds /* 12461da177e4SLinus Torvalds * Update the file handle to get the new inode info. 12471da177e4SLinus Torvalds */ 12481da177e4SLinus Torvalds if (!err) 12491da177e4SLinus Torvalds err = fh_update(resfhp); 12501da177e4SLinus Torvalds out: 12511da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 12521da177e4SLinus Torvalds dput(dchild); 12531da177e4SLinus Torvalds return err; 12541da177e4SLinus Torvalds 12551da177e4SLinus Torvalds out_nfserr: 12566264d69dSAl Viro err = nfserrno(host_err); 12571da177e4SLinus Torvalds goto out; 12581da177e4SLinus Torvalds } 12591da177e4SLinus Torvalds 12601da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 12611da177e4SLinus Torvalds /* 12621da177e4SLinus Torvalds * NFSv3 version of nfsd_create 12631da177e4SLinus Torvalds */ 12646264d69dSAl Viro __be32 12651da177e4SLinus Torvalds nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, 12661da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 12671da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 126881ac95c5SJ. Bruce Fields int *truncp, int *created) 12691da177e4SLinus Torvalds { 12701da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 12711da177e4SLinus Torvalds struct inode *dirp; 12726264d69dSAl Viro __be32 err; 12736264d69dSAl Viro int host_err; 12741da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 12751da177e4SLinus Torvalds 12761da177e4SLinus Torvalds err = nfserr_perm; 12771da177e4SLinus Torvalds if (!flen) 12781da177e4SLinus Torvalds goto out; 12791da177e4SLinus Torvalds err = nfserr_exist; 12801da177e4SLinus Torvalds if (isdotent(fname, flen)) 12811da177e4SLinus Torvalds goto out; 12821da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 12831da177e4SLinus Torvalds iap->ia_mode = 0; 12841da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); 12851da177e4SLinus Torvalds if (err) 12861da177e4SLinus Torvalds goto out; 12871da177e4SLinus Torvalds 12881da177e4SLinus Torvalds dentry = fhp->fh_dentry; 12891da177e4SLinus Torvalds dirp = dentry->d_inode; 12901da177e4SLinus Torvalds 12911da177e4SLinus Torvalds /* Get all the sanity checks out of the way before 12921da177e4SLinus Torvalds * we lock the parent. */ 12931da177e4SLinus Torvalds err = nfserr_notdir; 12941da177e4SLinus Torvalds if(!dirp->i_op || !dirp->i_op->lookup) 12951da177e4SLinus Torvalds goto out; 129612fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 12971da177e4SLinus Torvalds 12981da177e4SLinus Torvalds /* 12991da177e4SLinus Torvalds * Compose the response file handle. 13001da177e4SLinus Torvalds */ 13011da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 13026264d69dSAl Viro host_err = PTR_ERR(dchild); 13031da177e4SLinus Torvalds if (IS_ERR(dchild)) 13041da177e4SLinus Torvalds goto out_nfserr; 13051da177e4SLinus Torvalds 13061da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 13071da177e4SLinus Torvalds if (err) 13081da177e4SLinus Torvalds goto out; 13091da177e4SLinus Torvalds 13101da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1311c397852cSPeter Staubach /* solaris7 gets confused (bugid 4218508) if these have 1312749997e5SJeff Layton * the high bit set, so just clear the high bits. If this is 1313749997e5SJeff Layton * ever changed to use different attrs for storing the 1314749997e5SJeff Layton * verifier, then do_open_lookup() will also need to be fixed 1315749997e5SJeff Layton * accordingly. 13161da177e4SLinus Torvalds */ 13171da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 13181da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 13191da177e4SLinus Torvalds } 13201da177e4SLinus Torvalds 13211da177e4SLinus Torvalds if (dchild->d_inode) { 13221da177e4SLinus Torvalds err = 0; 13231da177e4SLinus Torvalds 13241da177e4SLinus Torvalds switch (createmode) { 13251da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 13261da177e4SLinus Torvalds if (! S_ISREG(dchild->d_inode->i_mode)) 13271da177e4SLinus Torvalds err = nfserr_exist; 13281da177e4SLinus Torvalds else if (truncp) { 13291da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 13301da177e4SLinus Torvalds * differently. we don't want to truncate the 13311da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 13321da177e4SLinus Torvalds * fails for some other reason. furthermore, 13331da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 13341da177e4SLinus Torvalds * according to spec! 13351da177e4SLinus Torvalds */ 13361da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 13371da177e4SLinus Torvalds } 13381da177e4SLinus Torvalds else { 13391da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 13401da177e4SLinus Torvalds goto set_attr; 13411da177e4SLinus Torvalds } 13421da177e4SLinus Torvalds break; 13431da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 13441da177e4SLinus Torvalds if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 13451da177e4SLinus Torvalds && dchild->d_inode->i_atime.tv_sec == v_atime 13461da177e4SLinus Torvalds && dchild->d_inode->i_size == 0 ) 13471da177e4SLinus Torvalds break; 13481da177e4SLinus Torvalds /* fallthru */ 13491da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 13501da177e4SLinus Torvalds err = nfserr_exist; 13511da177e4SLinus Torvalds } 13521da177e4SLinus Torvalds goto out; 13531da177e4SLinus Torvalds } 13541da177e4SLinus Torvalds 13556264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 13566264d69dSAl Viro if (host_err < 0) 13571da177e4SLinus Torvalds goto out_nfserr; 135881ac95c5SJ. Bruce Fields if (created) 135981ac95c5SJ. Bruce Fields *created = 1; 13601da177e4SLinus Torvalds 13611da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 136245bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(dentry)); 13631da177e4SLinus Torvalds /* setattr will sync the child (or not) */ 13641da177e4SLinus Torvalds } 13651da177e4SLinus Torvalds 13661da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1367c397852cSPeter Staubach /* Cram the verifier into atime/mtime */ 13681da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 1369c397852cSPeter Staubach | ATTR_MTIME_SET|ATTR_ATIME_SET; 13701da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 13711da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 13721da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 13731da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 13741da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 13751da177e4SLinus Torvalds } 13761da177e4SLinus Torvalds 13771da177e4SLinus Torvalds /* Set file attributes. 13781da177e4SLinus Torvalds * Irix appears to send along the gid when it tries to 13791da177e4SLinus Torvalds * implement setgid directories via NFS. Clear out all that cruft. 13801da177e4SLinus Torvalds */ 13811da177e4SLinus Torvalds set_attr: 1382c397852cSPeter Staubach if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) { 13836264d69dSAl Viro __be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 1384f193fbabSYAMAMOTO Takashi if (err2) 138545bd3b3dSNeilBrown err = err2; 1386f193fbabSYAMAMOTO Takashi } 1387f193fbabSYAMAMOTO Takashi 1388f193fbabSYAMAMOTO Takashi /* 1389f193fbabSYAMAMOTO Takashi * Update the filehandle to get the new inode info. 1390f193fbabSYAMAMOTO Takashi */ 1391f193fbabSYAMAMOTO Takashi if (!err) 1392f193fbabSYAMAMOTO Takashi err = fh_update(resfhp); 13931da177e4SLinus Torvalds 13941da177e4SLinus Torvalds out: 13951da177e4SLinus Torvalds fh_unlock(fhp); 13961da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 13971da177e4SLinus Torvalds dput(dchild); 13981da177e4SLinus Torvalds return err; 13991da177e4SLinus Torvalds 14001da177e4SLinus Torvalds out_nfserr: 14016264d69dSAl Viro err = nfserrno(host_err); 14021da177e4SLinus Torvalds goto out; 14031da177e4SLinus Torvalds } 14041da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 14051da177e4SLinus Torvalds 14061da177e4SLinus Torvalds /* 14071da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 14081da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 14091da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 14101da177e4SLinus Torvalds */ 14116264d69dSAl Viro __be32 14121da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 14131da177e4SLinus Torvalds { 14141da177e4SLinus Torvalds struct dentry *dentry; 14151da177e4SLinus Torvalds struct inode *inode; 14161da177e4SLinus Torvalds mm_segment_t oldfs; 14176264d69dSAl Viro __be32 err; 14186264d69dSAl Viro int host_err; 14191da177e4SLinus Torvalds 14201da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP); 14211da177e4SLinus Torvalds if (err) 14221da177e4SLinus Torvalds goto out; 14231da177e4SLinus Torvalds 14241da177e4SLinus Torvalds dentry = fhp->fh_dentry; 14251da177e4SLinus Torvalds inode = dentry->d_inode; 14261da177e4SLinus Torvalds 14271da177e4SLinus Torvalds err = nfserr_inval; 14281da177e4SLinus Torvalds if (!inode->i_op || !inode->i_op->readlink) 14291da177e4SLinus Torvalds goto out; 14301da177e4SLinus Torvalds 14311da177e4SLinus Torvalds touch_atime(fhp->fh_export->ex_mnt, dentry); 14321da177e4SLinus Torvalds /* N.B. Why does this call need a get_fs()?? 14331da177e4SLinus Torvalds * Remove the set_fs and watch the fireworks:-) --okir 14341da177e4SLinus Torvalds */ 14351da177e4SLinus Torvalds 14361da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 14376264d69dSAl Viro host_err = inode->i_op->readlink(dentry, buf, *lenp); 14381da177e4SLinus Torvalds set_fs(oldfs); 14391da177e4SLinus Torvalds 14406264d69dSAl Viro if (host_err < 0) 14411da177e4SLinus Torvalds goto out_nfserr; 14426264d69dSAl Viro *lenp = host_err; 14431da177e4SLinus Torvalds err = 0; 14441da177e4SLinus Torvalds out: 14451da177e4SLinus Torvalds return err; 14461da177e4SLinus Torvalds 14471da177e4SLinus Torvalds out_nfserr: 14486264d69dSAl Viro err = nfserrno(host_err); 14491da177e4SLinus Torvalds goto out; 14501da177e4SLinus Torvalds } 14511da177e4SLinus Torvalds 14521da177e4SLinus Torvalds /* 14531da177e4SLinus Torvalds * Create a symlink and look up its inode 14541da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 14551da177e4SLinus Torvalds */ 14566264d69dSAl Viro __be32 14571da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 14581da177e4SLinus Torvalds char *fname, int flen, 14591da177e4SLinus Torvalds char *path, int plen, 14601da177e4SLinus Torvalds struct svc_fh *resfhp, 14611da177e4SLinus Torvalds struct iattr *iap) 14621da177e4SLinus Torvalds { 14631da177e4SLinus Torvalds struct dentry *dentry, *dnew; 14646264d69dSAl Viro __be32 err, cerr; 14656264d69dSAl Viro int host_err; 14661da177e4SLinus Torvalds umode_t mode; 14671da177e4SLinus Torvalds 14681da177e4SLinus Torvalds err = nfserr_noent; 14691da177e4SLinus Torvalds if (!flen || !plen) 14701da177e4SLinus Torvalds goto out; 14711da177e4SLinus Torvalds err = nfserr_exist; 14721da177e4SLinus Torvalds if (isdotent(fname, flen)) 14731da177e4SLinus Torvalds goto out; 14741da177e4SLinus Torvalds 14751da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); 14761da177e4SLinus Torvalds if (err) 14771da177e4SLinus Torvalds goto out; 14781da177e4SLinus Torvalds fh_lock(fhp); 14791da177e4SLinus Torvalds dentry = fhp->fh_dentry; 14801da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 14816264d69dSAl Viro host_err = PTR_ERR(dnew); 14821da177e4SLinus Torvalds if (IS_ERR(dnew)) 14831da177e4SLinus Torvalds goto out_nfserr; 14841da177e4SLinus Torvalds 14851da177e4SLinus Torvalds mode = S_IALLUGO; 14861da177e4SLinus Torvalds /* Only the MODE ATTRibute is even vaguely meaningful */ 14871da177e4SLinus Torvalds if (iap && (iap->ia_valid & ATTR_MODE)) 14881da177e4SLinus Torvalds mode = iap->ia_mode & S_IALLUGO; 14891da177e4SLinus Torvalds 14901da177e4SLinus Torvalds if (unlikely(path[plen] != 0)) { 14911da177e4SLinus Torvalds char *path_alloced = kmalloc(plen+1, GFP_KERNEL); 14921da177e4SLinus Torvalds if (path_alloced == NULL) 14936264d69dSAl Viro host_err = -ENOMEM; 14941da177e4SLinus Torvalds else { 14951da177e4SLinus Torvalds strncpy(path_alloced, path, plen); 14961da177e4SLinus Torvalds path_alloced[plen] = 0; 14976264d69dSAl Viro host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode); 14981da177e4SLinus Torvalds kfree(path_alloced); 14991da177e4SLinus Torvalds } 15001da177e4SLinus Torvalds } else 15016264d69dSAl Viro host_err = vfs_symlink(dentry->d_inode, dnew, path, mode); 15021da177e4SLinus Torvalds 15036264d69dSAl Viro if (!host_err) { 15041da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 15056264d69dSAl Viro host_err = nfsd_sync_dir(dentry); 15066264d69dSAl Viro } 15076264d69dSAl Viro err = nfserrno(host_err); 15081da177e4SLinus Torvalds fh_unlock(fhp); 15091da177e4SLinus Torvalds 15101da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 15111da177e4SLinus Torvalds dput(dnew); 15121da177e4SLinus Torvalds if (err==0) err = cerr; 15131da177e4SLinus Torvalds out: 15141da177e4SLinus Torvalds return err; 15151da177e4SLinus Torvalds 15161da177e4SLinus Torvalds out_nfserr: 15176264d69dSAl Viro err = nfserrno(host_err); 15181da177e4SLinus Torvalds goto out; 15191da177e4SLinus Torvalds } 15201da177e4SLinus Torvalds 15211da177e4SLinus Torvalds /* 15221da177e4SLinus Torvalds * Create a hardlink 15231da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 15241da177e4SLinus Torvalds */ 15256264d69dSAl Viro __be32 15261da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 15271da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 15281da177e4SLinus Torvalds { 15291da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 15301da177e4SLinus Torvalds struct inode *dirp, *dest; 15316264d69dSAl Viro __be32 err; 15326264d69dSAl Viro int host_err; 15331da177e4SLinus Torvalds 15341da177e4SLinus Torvalds err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE); 15351da177e4SLinus Torvalds if (err) 15361da177e4SLinus Torvalds goto out; 15371da177e4SLinus Torvalds err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP); 15381da177e4SLinus Torvalds if (err) 15391da177e4SLinus Torvalds goto out; 15401da177e4SLinus Torvalds 15411da177e4SLinus Torvalds err = nfserr_perm; 15421da177e4SLinus Torvalds if (!len) 15431da177e4SLinus Torvalds goto out; 15441da177e4SLinus Torvalds err = nfserr_exist; 15451da177e4SLinus Torvalds if (isdotent(name, len)) 15461da177e4SLinus Torvalds goto out; 15471da177e4SLinus Torvalds 154812fd3520SPeter Zijlstra fh_lock_nested(ffhp, I_MUTEX_PARENT); 15491da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 15501da177e4SLinus Torvalds dirp = ddir->d_inode; 15511da177e4SLinus Torvalds 15521da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 15536264d69dSAl Viro host_err = PTR_ERR(dnew); 15541da177e4SLinus Torvalds if (IS_ERR(dnew)) 15551da177e4SLinus Torvalds goto out_nfserr; 15561da177e4SLinus Torvalds 15571da177e4SLinus Torvalds dold = tfhp->fh_dentry; 15581da177e4SLinus Torvalds dest = dold->d_inode; 15591da177e4SLinus Torvalds 15606264d69dSAl Viro host_err = vfs_link(dold, dirp, dnew); 15616264d69dSAl Viro if (!host_err) { 15621da177e4SLinus Torvalds if (EX_ISSYNC(ffhp->fh_export)) { 156345bd3b3dSNeilBrown err = nfserrno(nfsd_sync_dir(ddir)); 15641da177e4SLinus Torvalds write_inode_now(dest, 1); 15651da177e4SLinus Torvalds } 15666264d69dSAl Viro err = 0; 15671da177e4SLinus Torvalds } else { 15686264d69dSAl Viro if (host_err == -EXDEV && rqstp->rq_vers == 2) 15691da177e4SLinus Torvalds err = nfserr_acces; 15701da177e4SLinus Torvalds else 15716264d69dSAl Viro err = nfserrno(host_err); 15721da177e4SLinus Torvalds } 15731da177e4SLinus Torvalds 15741da177e4SLinus Torvalds dput(dnew); 1575270d56e5SDavid M. Richter out_unlock: 1576270d56e5SDavid M. Richter fh_unlock(ffhp); 15771da177e4SLinus Torvalds out: 15781da177e4SLinus Torvalds return err; 15791da177e4SLinus Torvalds 15801da177e4SLinus Torvalds out_nfserr: 15816264d69dSAl Viro err = nfserrno(host_err); 1582270d56e5SDavid M. Richter goto out_unlock; 15831da177e4SLinus Torvalds } 15841da177e4SLinus Torvalds 15851da177e4SLinus Torvalds /* 15861da177e4SLinus Torvalds * Rename a file 15871da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 15881da177e4SLinus Torvalds */ 15896264d69dSAl Viro __be32 15901da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 15911da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 15921da177e4SLinus Torvalds { 15931da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 15941da177e4SLinus Torvalds struct inode *fdir, *tdir; 15956264d69dSAl Viro __be32 err; 15966264d69dSAl Viro int host_err; 15971da177e4SLinus Torvalds 15981da177e4SLinus Torvalds err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE); 15991da177e4SLinus Torvalds if (err) 16001da177e4SLinus Torvalds goto out; 16011da177e4SLinus Torvalds err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE); 16021da177e4SLinus Torvalds if (err) 16031da177e4SLinus Torvalds goto out; 16041da177e4SLinus Torvalds 16051da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 16061da177e4SLinus Torvalds fdir = fdentry->d_inode; 16071da177e4SLinus Torvalds 16081da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 16091da177e4SLinus Torvalds tdir = tdentry->d_inode; 16101da177e4SLinus Torvalds 16111da177e4SLinus Torvalds err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; 1612a56f3937SNeilBrown if (ffhp->fh_export != tfhp->fh_export) 16131da177e4SLinus Torvalds goto out; 16141da177e4SLinus Torvalds 16151da177e4SLinus Torvalds err = nfserr_perm; 16161da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 16171da177e4SLinus Torvalds goto out; 16181da177e4SLinus Torvalds 16191da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 16201da177e4SLinus Torvalds * so do it by hand */ 16211da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 16221da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 1; 16231da177e4SLinus Torvalds fill_pre_wcc(ffhp); 16241da177e4SLinus Torvalds fill_pre_wcc(tfhp); 16251da177e4SLinus Torvalds 16261da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 16276264d69dSAl Viro host_err = PTR_ERR(odentry); 16281da177e4SLinus Torvalds if (IS_ERR(odentry)) 16291da177e4SLinus Torvalds goto out_nfserr; 16301da177e4SLinus Torvalds 16316264d69dSAl Viro host_err = -ENOENT; 16321da177e4SLinus Torvalds if (!odentry->d_inode) 16331da177e4SLinus Torvalds goto out_dput_old; 16346264d69dSAl Viro host_err = -EINVAL; 16351da177e4SLinus Torvalds if (odentry == trap) 16361da177e4SLinus Torvalds goto out_dput_old; 16371da177e4SLinus Torvalds 16381da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 16396264d69dSAl Viro host_err = PTR_ERR(ndentry); 16401da177e4SLinus Torvalds if (IS_ERR(ndentry)) 16411da177e4SLinus Torvalds goto out_dput_old; 16426264d69dSAl Viro host_err = -ENOTEMPTY; 16431da177e4SLinus Torvalds if (ndentry == trap) 16441da177e4SLinus Torvalds goto out_dput_new; 16451da177e4SLinus Torvalds 16461da177e4SLinus Torvalds #ifdef MSNFS 16471da177e4SLinus Torvalds if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) && 16481da177e4SLinus Torvalds ((atomic_read(&odentry->d_count) > 1) 16491da177e4SLinus Torvalds || (atomic_read(&ndentry->d_count) > 1))) { 16506264d69dSAl Viro host_err = -EPERM; 16511da177e4SLinus Torvalds } else 16521da177e4SLinus Torvalds #endif 16536264d69dSAl Viro host_err = vfs_rename(fdir, odentry, tdir, ndentry); 16546264d69dSAl Viro if (!host_err && EX_ISSYNC(tfhp->fh_export)) { 16556264d69dSAl Viro host_err = nfsd_sync_dir(tdentry); 16566264d69dSAl Viro if (!host_err) 16576264d69dSAl Viro host_err = nfsd_sync_dir(fdentry); 16581da177e4SLinus Torvalds } 16591da177e4SLinus Torvalds 16601da177e4SLinus Torvalds out_dput_new: 16611da177e4SLinus Torvalds dput(ndentry); 16621da177e4SLinus Torvalds out_dput_old: 16631da177e4SLinus Torvalds dput(odentry); 16641da177e4SLinus Torvalds out_nfserr: 16656264d69dSAl Viro err = nfserrno(host_err); 16661da177e4SLinus Torvalds 16671da177e4SLinus Torvalds /* we cannot reply on fh_unlock on the two filehandles, 16681da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 16691da177e4SLinus Torvalds * were the same, so again we do it by hand 16701da177e4SLinus Torvalds */ 16711da177e4SLinus Torvalds fill_post_wcc(ffhp); 16721da177e4SLinus Torvalds fill_post_wcc(tfhp); 16731da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 16741da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 0; 16751da177e4SLinus Torvalds 16761da177e4SLinus Torvalds out: 16771da177e4SLinus Torvalds return err; 16781da177e4SLinus Torvalds } 16791da177e4SLinus Torvalds 16801da177e4SLinus Torvalds /* 16811da177e4SLinus Torvalds * Unlink a file or directory 16821da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 16831da177e4SLinus Torvalds */ 16846264d69dSAl Viro __be32 16851da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 16861da177e4SLinus Torvalds char *fname, int flen) 16871da177e4SLinus Torvalds { 16881da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 16891da177e4SLinus Torvalds struct inode *dirp; 16906264d69dSAl Viro __be32 err; 16916264d69dSAl Viro int host_err; 16921da177e4SLinus Torvalds 16931da177e4SLinus Torvalds err = nfserr_acces; 16941da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 16951da177e4SLinus Torvalds goto out; 16961da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE); 16971da177e4SLinus Torvalds if (err) 16981da177e4SLinus Torvalds goto out; 16991da177e4SLinus Torvalds 170012fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 17011da177e4SLinus Torvalds dentry = fhp->fh_dentry; 17021da177e4SLinus Torvalds dirp = dentry->d_inode; 17031da177e4SLinus Torvalds 17041da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 17056264d69dSAl Viro host_err = PTR_ERR(rdentry); 17061da177e4SLinus Torvalds if (IS_ERR(rdentry)) 17071da177e4SLinus Torvalds goto out_nfserr; 17081da177e4SLinus Torvalds 17091da177e4SLinus Torvalds if (!rdentry->d_inode) { 17101da177e4SLinus Torvalds dput(rdentry); 17111da177e4SLinus Torvalds err = nfserr_noent; 17121da177e4SLinus Torvalds goto out; 17131da177e4SLinus Torvalds } 17141da177e4SLinus Torvalds 17151da177e4SLinus Torvalds if (!type) 17161da177e4SLinus Torvalds type = rdentry->d_inode->i_mode & S_IFMT; 17171da177e4SLinus Torvalds 17181da177e4SLinus Torvalds if (type != S_IFDIR) { /* It's UNLINK */ 17191da177e4SLinus Torvalds #ifdef MSNFS 17201da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 17211da177e4SLinus Torvalds (atomic_read(&rdentry->d_count) > 1)) { 17226264d69dSAl Viro host_err = -EPERM; 17231da177e4SLinus Torvalds } else 17241da177e4SLinus Torvalds #endif 17256264d69dSAl Viro host_err = vfs_unlink(dirp, rdentry); 17261da177e4SLinus Torvalds } else { /* It's RMDIR */ 17276264d69dSAl Viro host_err = vfs_rmdir(dirp, rdentry); 17281da177e4SLinus Torvalds } 17291da177e4SLinus Torvalds 17301da177e4SLinus Torvalds dput(rdentry); 17311da177e4SLinus Torvalds 17326264d69dSAl Viro if (host_err) 17336264d69dSAl Viro goto out_nfserr; 17346264d69dSAl Viro if (EX_ISSYNC(fhp->fh_export)) 17356264d69dSAl Viro host_err = nfsd_sync_dir(dentry); 17361da177e4SLinus Torvalds 17371da177e4SLinus Torvalds out_nfserr: 17386264d69dSAl Viro err = nfserrno(host_err); 1739f193fbabSYAMAMOTO Takashi out: 1740f193fbabSYAMAMOTO Takashi return err; 17411da177e4SLinus Torvalds } 17421da177e4SLinus Torvalds 17431da177e4SLinus Torvalds /* 17441da177e4SLinus Torvalds * Read entries from a directory. 17451da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 17461da177e4SLinus Torvalds */ 17476264d69dSAl Viro __be32 17481da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 1749a0ad13efSNeilBrown struct readdir_cd *cdp, filldir_t func) 17501da177e4SLinus Torvalds { 17516264d69dSAl Viro __be32 err; 17526264d69dSAl Viro int host_err; 17531da177e4SLinus Torvalds struct file *file; 17541da177e4SLinus Torvalds loff_t offset = *offsetp; 17551da177e4SLinus Torvalds 17561da177e4SLinus Torvalds err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file); 17571da177e4SLinus Torvalds if (err) 17581da177e4SLinus Torvalds goto out; 17591da177e4SLinus Torvalds 17601da177e4SLinus Torvalds offset = vfs_llseek(file, offset, 0); 17611da177e4SLinus Torvalds if (offset < 0) { 17621da177e4SLinus Torvalds err = nfserrno((int)offset); 17631da177e4SLinus Torvalds goto out_close; 17641da177e4SLinus Torvalds } 17651da177e4SLinus Torvalds 17661da177e4SLinus Torvalds /* 17671da177e4SLinus Torvalds * Read the directory entries. This silly loop is necessary because 17681da177e4SLinus Torvalds * readdir() is not guaranteed to fill up the entire buffer, but 17691da177e4SLinus Torvalds * may choose to do less. 17701da177e4SLinus Torvalds */ 17711da177e4SLinus Torvalds 17721da177e4SLinus Torvalds do { 17731da177e4SLinus Torvalds cdp->err = nfserr_eof; /* will be cleared on successful read */ 1774a0ad13efSNeilBrown host_err = vfs_readdir(file, func, cdp); 17756264d69dSAl Viro } while (host_err >=0 && cdp->err == nfs_ok); 17766264d69dSAl Viro if (host_err) 17776264d69dSAl Viro err = nfserrno(host_err); 17781da177e4SLinus Torvalds else 17791da177e4SLinus Torvalds err = cdp->err; 17801da177e4SLinus Torvalds *offsetp = vfs_llseek(file, 0, 1); 17811da177e4SLinus Torvalds 17821da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 17831da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 17841da177e4SLinus Torvalds out_close: 17851da177e4SLinus Torvalds nfsd_close(file); 17861da177e4SLinus Torvalds out: 17871da177e4SLinus Torvalds return err; 17881da177e4SLinus Torvalds } 17891da177e4SLinus Torvalds 17901da177e4SLinus Torvalds /* 17911da177e4SLinus Torvalds * Get file system stats 17921da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 17931da177e4SLinus Torvalds */ 17946264d69dSAl Viro __be32 17951da177e4SLinus Torvalds nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat) 17961da177e4SLinus Torvalds { 17976264d69dSAl Viro __be32 err = fh_verify(rqstp, fhp, 0, MAY_NOP); 1798726c3342SDavid Howells if (!err && vfs_statfs(fhp->fh_dentry,stat)) 17991da177e4SLinus Torvalds err = nfserr_io; 18001da177e4SLinus Torvalds return err; 18011da177e4SLinus Torvalds } 18021da177e4SLinus Torvalds 1803c7d51402SJ. Bruce Fields static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) 1804e22841c6SJ. Bruce Fields { 1805c7d51402SJ. Bruce Fields return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; 1806e22841c6SJ. Bruce Fields } 1807e22841c6SJ. Bruce Fields 18081da177e4SLinus Torvalds /* 18091da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 18101da177e4SLinus Torvalds */ 18116264d69dSAl Viro __be32 18120ec757dfSJ. Bruce Fields nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, 18130ec757dfSJ. Bruce Fields struct dentry *dentry, int acc) 18141da177e4SLinus Torvalds { 18151da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 18161da177e4SLinus Torvalds int err; 18171da177e4SLinus Torvalds 18181da177e4SLinus Torvalds if (acc == MAY_NOP) 18191da177e4SLinus Torvalds return 0; 18201da177e4SLinus Torvalds #if 0 18211da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 18221da177e4SLinus Torvalds acc, 18231da177e4SLinus Torvalds (acc & MAY_READ)? " read" : "", 18241da177e4SLinus Torvalds (acc & MAY_WRITE)? " write" : "", 18251da177e4SLinus Torvalds (acc & MAY_EXEC)? " exec" : "", 18261da177e4SLinus Torvalds (acc & MAY_SATTR)? " sattr" : "", 18271da177e4SLinus Torvalds (acc & MAY_TRUNC)? " trunc" : "", 18281da177e4SLinus Torvalds (acc & MAY_LOCK)? " lock" : "", 18291da177e4SLinus Torvalds (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "", 18301da177e4SLinus Torvalds inode->i_mode, 18311da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 18321da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 18331da177e4SLinus Torvalds IS_RDONLY(inode)? " ro" : ""); 18341da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 18351da177e4SLinus Torvalds inode->i_uid, inode->i_gid, current->fsuid, current->fsgid); 18361da177e4SLinus Torvalds #endif 18371da177e4SLinus Torvalds 18381da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 18391da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 18401da177e4SLinus Torvalds * device special file, we ignore rofs. 18411da177e4SLinus Torvalds */ 18421da177e4SLinus Torvalds if (!(acc & MAY_LOCAL_ACCESS)) 18431da177e4SLinus Torvalds if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) { 1844c7d51402SJ. Bruce Fields if (exp_rdonly(rqstp, exp) || IS_RDONLY(inode)) 18451da177e4SLinus Torvalds return nfserr_rofs; 18461da177e4SLinus Torvalds if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode)) 18471da177e4SLinus Torvalds return nfserr_perm; 18481da177e4SLinus Torvalds } 18491da177e4SLinus Torvalds if ((acc & MAY_TRUNC) && IS_APPEND(inode)) 18501da177e4SLinus Torvalds return nfserr_perm; 18511da177e4SLinus Torvalds 18521da177e4SLinus Torvalds if (acc & MAY_LOCK) { 18531da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 18541da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 18551da177e4SLinus Torvalds * ownership 18561da177e4SLinus Torvalds */ 18571da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 18581da177e4SLinus Torvalds return 0; 18591da177e4SLinus Torvalds else 18601da177e4SLinus Torvalds acc = MAY_READ | MAY_OWNER_OVERRIDE; 18611da177e4SLinus Torvalds } 18621da177e4SLinus Torvalds /* 18631da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 18641da177e4SLinus Torvalds * would normally be checked at open time. This is to make 18651da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 18661da177e4SLinus Torvalds * 18671da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 18681da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 18691da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 18701da177e4SLinus Torvalds * always implies file truncation. 18711da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 18721da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 18731da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 18741da177e4SLinus Torvalds * with NFSv3. 18751da177e4SLinus Torvalds */ 18761da177e4SLinus Torvalds if ((acc & MAY_OWNER_OVERRIDE) && 18771da177e4SLinus Torvalds inode->i_uid == current->fsuid) 18781da177e4SLinus Torvalds return 0; 18791da177e4SLinus Torvalds 18801da177e4SLinus Torvalds err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL); 18811da177e4SLinus Torvalds 18821da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 18831da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 18841da177e4SLinus Torvalds acc == (MAY_READ | MAY_OWNER_OVERRIDE)) 18851da177e4SLinus Torvalds err = permission(inode, MAY_EXEC, NULL); 18861da177e4SLinus Torvalds 18871da177e4SLinus Torvalds return err? nfserrno(err) : 0; 18881da177e4SLinus Torvalds } 18891da177e4SLinus Torvalds 18901da177e4SLinus Torvalds void 18911da177e4SLinus Torvalds nfsd_racache_shutdown(void) 18921da177e4SLinus Torvalds { 1893fce1456aSGreg Banks if (!raparml) 18941da177e4SLinus Torvalds return; 18951da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 18961da177e4SLinus Torvalds kfree(raparml); 1897fce1456aSGreg Banks raparml = NULL; 18981da177e4SLinus Torvalds } 18991da177e4SLinus Torvalds /* 19001da177e4SLinus Torvalds * Initialize readahead param cache 19011da177e4SLinus Torvalds */ 19021da177e4SLinus Torvalds int 19031da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 19041da177e4SLinus Torvalds { 19051da177e4SLinus Torvalds int i; 1906fce1456aSGreg Banks int j = 0; 1907fce1456aSGreg Banks int nperbucket; 19081da177e4SLinus Torvalds 1909fce1456aSGreg Banks 1910fce1456aSGreg Banks if (raparml) 19111da177e4SLinus Torvalds return 0; 1912fce1456aSGreg Banks if (cache_size < 2*RAPARM_HASH_SIZE) 1913fce1456aSGreg Banks cache_size = 2*RAPARM_HASH_SIZE; 19144b3bb06bSYan Burman raparml = kcalloc(cache_size, sizeof(struct raparms), GFP_KERNEL); 19151da177e4SLinus Torvalds 19164b3bb06bSYan Burman if (!raparml) { 19174b3bb06bSYan Burman printk(KERN_WARNING 19184b3bb06bSYan Burman "nfsd: Could not allocate memory read-ahead cache.\n"); 19194b3bb06bSYan Burman return -ENOMEM; 19204b3bb06bSYan Burman } 19214b3bb06bSYan Burman 19224b3bb06bSYan Burman dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); 1923fce1456aSGreg Banks for (i = 0 ; i < RAPARM_HASH_SIZE ; i++) { 1924fce1456aSGreg Banks raparm_hash[i].pb_head = NULL; 1925fce1456aSGreg Banks spin_lock_init(&raparm_hash[i].pb_lock); 1926fce1456aSGreg Banks } 1927a280df32SJ. Bruce Fields nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); 19281da177e4SLinus Torvalds for (i = 0; i < cache_size - 1; i++) { 1929fce1456aSGreg Banks if (i % nperbucket == 0) 1930fce1456aSGreg Banks raparm_hash[j++].pb_head = raparml + i; 1931fce1456aSGreg Banks if (i % nperbucket < nperbucket-1) 19321da177e4SLinus Torvalds raparml[i].p_next = raparml + i + 1; 19331da177e4SLinus Torvalds } 19344b3bb06bSYan Burman 19351da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 19361da177e4SLinus Torvalds return 0; 19371da177e4SLinus Torvalds } 1938a257cdd0SAndreas Gruenbacher 1939a257cdd0SAndreas Gruenbacher #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 1940a257cdd0SAndreas Gruenbacher struct posix_acl * 1941a257cdd0SAndreas Gruenbacher nfsd_get_posix_acl(struct svc_fh *fhp, int type) 1942a257cdd0SAndreas Gruenbacher { 1943a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 1944a257cdd0SAndreas Gruenbacher char *name; 1945a257cdd0SAndreas Gruenbacher void *value = NULL; 1946a257cdd0SAndreas Gruenbacher ssize_t size; 1947a257cdd0SAndreas Gruenbacher struct posix_acl *acl; 1948a257cdd0SAndreas Gruenbacher 19495be196e5SChristoph Hellwig if (!IS_POSIXACL(inode)) 1950a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 19515be196e5SChristoph Hellwig 1952a257cdd0SAndreas Gruenbacher switch (type) { 1953a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 1954334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 1955a257cdd0SAndreas Gruenbacher break; 1956a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 1957334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 1958a257cdd0SAndreas Gruenbacher break; 1959a257cdd0SAndreas Gruenbacher default: 1960a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 1961a257cdd0SAndreas Gruenbacher } 1962a257cdd0SAndreas Gruenbacher 19635be196e5SChristoph Hellwig size = nfsd_getxattr(fhp->fh_dentry, name, &value); 19645be196e5SChristoph Hellwig if (size < 0) 19655be196e5SChristoph Hellwig return ERR_PTR(size); 1966a257cdd0SAndreas Gruenbacher 1967a257cdd0SAndreas Gruenbacher acl = posix_acl_from_xattr(value, size); 1968a257cdd0SAndreas Gruenbacher kfree(value); 1969a257cdd0SAndreas Gruenbacher return acl; 1970a257cdd0SAndreas Gruenbacher } 1971a257cdd0SAndreas Gruenbacher 1972a257cdd0SAndreas Gruenbacher int 1973a257cdd0SAndreas Gruenbacher nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) 1974a257cdd0SAndreas Gruenbacher { 1975a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 1976a257cdd0SAndreas Gruenbacher char *name; 1977a257cdd0SAndreas Gruenbacher void *value = NULL; 1978a257cdd0SAndreas Gruenbacher size_t size; 1979a257cdd0SAndreas Gruenbacher int error; 1980a257cdd0SAndreas Gruenbacher 1981a257cdd0SAndreas Gruenbacher if (!IS_POSIXACL(inode) || !inode->i_op || 1982a257cdd0SAndreas Gruenbacher !inode->i_op->setxattr || !inode->i_op->removexattr) 1983a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 1984a257cdd0SAndreas Gruenbacher switch(type) { 1985a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 1986334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 1987a257cdd0SAndreas Gruenbacher break; 1988a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 1989334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 1990a257cdd0SAndreas Gruenbacher break; 1991a257cdd0SAndreas Gruenbacher default: 1992a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 1993a257cdd0SAndreas Gruenbacher } 1994a257cdd0SAndreas Gruenbacher 1995a257cdd0SAndreas Gruenbacher if (acl && acl->a_count) { 1996334a13ecSChristoph Hellwig size = posix_acl_xattr_size(acl->a_count); 1997a257cdd0SAndreas Gruenbacher value = kmalloc(size, GFP_KERNEL); 1998a257cdd0SAndreas Gruenbacher if (!value) 1999a257cdd0SAndreas Gruenbacher return -ENOMEM; 20009ccfc29cSFlorin Malita error = posix_acl_to_xattr(acl, value, size); 20019ccfc29cSFlorin Malita if (error < 0) 2002a257cdd0SAndreas Gruenbacher goto getout; 20039ccfc29cSFlorin Malita size = error; 2004a257cdd0SAndreas Gruenbacher } else 2005a257cdd0SAndreas Gruenbacher size = 0; 2006a257cdd0SAndreas Gruenbacher 2007a257cdd0SAndreas Gruenbacher if (size) 20085be196e5SChristoph Hellwig error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); 2009a257cdd0SAndreas Gruenbacher else { 2010a257cdd0SAndreas Gruenbacher if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) 2011a257cdd0SAndreas Gruenbacher error = 0; 2012a257cdd0SAndreas Gruenbacher else { 20135be196e5SChristoph Hellwig error = vfs_removexattr(fhp->fh_dentry, name); 2014a257cdd0SAndreas Gruenbacher if (error == -ENODATA) 2015a257cdd0SAndreas Gruenbacher error = 0; 2016a257cdd0SAndreas Gruenbacher } 2017a257cdd0SAndreas Gruenbacher } 2018a257cdd0SAndreas Gruenbacher 2019a257cdd0SAndreas Gruenbacher getout: 2020a257cdd0SAndreas Gruenbacher kfree(value); 2021a257cdd0SAndreas Gruenbacher return error; 2022a257cdd0SAndreas Gruenbacher } 2023a257cdd0SAndreas Gruenbacher #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ 2024