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/config.h> 201da177e4SLinus Torvalds #include <linux/string.h> 211da177e4SLinus Torvalds #include <linux/time.h> 221da177e4SLinus Torvalds #include <linux/errno.h> 231da177e4SLinus Torvalds #include <linux/fs.h> 241da177e4SLinus Torvalds #include <linux/file.h> 251da177e4SLinus Torvalds #include <linux/mount.h> 261da177e4SLinus Torvalds #include <linux/major.h> 271da177e4SLinus Torvalds #include <linux/ext2_fs.h> 281da177e4SLinus Torvalds #include <linux/proc_fs.h> 291da177e4SLinus Torvalds #include <linux/stat.h> 301da177e4SLinus Torvalds #include <linux/fcntl.h> 311da177e4SLinus Torvalds #include <linux/net.h> 321da177e4SLinus Torvalds #include <linux/unistd.h> 331da177e4SLinus Torvalds #include <linux/slab.h> 341da177e4SLinus Torvalds #include <linux/pagemap.h> 351da177e4SLinus Torvalds #include <linux/in.h> 361da177e4SLinus Torvalds #include <linux/module.h> 371da177e4SLinus Torvalds #include <linux/namei.h> 381da177e4SLinus Torvalds #include <linux/vfs.h> 391da177e4SLinus Torvalds #include <linux/delay.h> 401da177e4SLinus Torvalds #include <linux/sunrpc/svc.h> 411da177e4SLinus Torvalds #include <linux/nfsd/nfsd.h> 421da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 431da177e4SLinus Torvalds #include <linux/nfs3.h> 441da177e4SLinus Torvalds #include <linux/nfsd/xdr3.h> 451da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 461da177e4SLinus Torvalds #include <linux/nfsd/nfsfh.h> 471da177e4SLinus Torvalds #include <linux/quotaops.h> 481da177e4SLinus Torvalds #include <linux/dnotify.h> 491da177e4SLinus Torvalds #include <linux/posix_acl.h> 501da177e4SLinus Torvalds #include <linux/posix_acl_xattr.h> 51*334a13ecSChristoph Hellwig #ifdef CONFIG_NFSD_V4 521da177e4SLinus Torvalds #include <linux/xattr.h> 531da177e4SLinus Torvalds #include <linux/nfs4.h> 541da177e4SLinus Torvalds #include <linux/nfs4_acl.h> 551da177e4SLinus Torvalds #include <linux/nfsd_idmap.h> 561da177e4SLinus Torvalds #include <linux/security.h> 571da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V4 */ 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds #include <asm/uaccess.h> 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds #define NFSDDBG_FACILITY NFSDDBG_FILEOP 621da177e4SLinus Torvalds #define NFSD_PARANOIA 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds /* We must ignore files (but only files) which might have mandatory 661da177e4SLinus Torvalds * locks on them because there is no way to know if the accesser has 671da177e4SLinus Torvalds * the lock. 681da177e4SLinus Torvalds */ 691da177e4SLinus Torvalds #define IS_ISMNDLK(i) (S_ISREG((i)->i_mode) && MANDATORY_LOCK(i)) 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds /* 721da177e4SLinus Torvalds * This is a cache of readahead params that help us choose the proper 731da177e4SLinus Torvalds * readahead strategy. Initially, we set all readahead parameters to 0 741da177e4SLinus Torvalds * and let the VFS handle things. 751da177e4SLinus Torvalds * If you increase the number of cached files very much, you'll need to 761da177e4SLinus Torvalds * add a hash table here. 771da177e4SLinus Torvalds */ 781da177e4SLinus Torvalds struct raparms { 791da177e4SLinus Torvalds struct raparms *p_next; 801da177e4SLinus Torvalds unsigned int p_count; 811da177e4SLinus Torvalds ino_t p_ino; 821da177e4SLinus Torvalds dev_t p_dev; 831da177e4SLinus Torvalds int p_set; 841da177e4SLinus Torvalds struct file_ra_state p_ra; 851da177e4SLinus Torvalds }; 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds static struct raparms * raparml; 881da177e4SLinus Torvalds static struct raparms * raparm_cache; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds /* 911da177e4SLinus Torvalds * Called from nfsd_lookup and encode_dirent. Check if we have crossed 921da177e4SLinus Torvalds * a mount point. 931da177e4SLinus Torvalds * Returns -EAGAIN leaving *dpp and *expp unchanged, 941da177e4SLinus Torvalds * or nfs_ok having possibly changed *dpp and *expp 951da177e4SLinus Torvalds */ 961da177e4SLinus Torvalds int 971da177e4SLinus Torvalds nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 981da177e4SLinus Torvalds struct svc_export **expp) 991da177e4SLinus Torvalds { 1001da177e4SLinus Torvalds struct svc_export *exp = *expp, *exp2 = NULL; 1011da177e4SLinus Torvalds struct dentry *dentry = *dpp; 1021da177e4SLinus Torvalds struct vfsmount *mnt = mntget(exp->ex_mnt); 1031da177e4SLinus Torvalds struct dentry *mounts = dget(dentry); 1041da177e4SLinus Torvalds int err = nfs_ok; 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts)); 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds exp2 = exp_get_by_name(exp->ex_client, mnt, mounts, &rqstp->rq_chandle); 1091da177e4SLinus Torvalds if (IS_ERR(exp2)) { 1101da177e4SLinus Torvalds err = PTR_ERR(exp2); 1111da177e4SLinus Torvalds dput(mounts); 1121da177e4SLinus Torvalds mntput(mnt); 1131da177e4SLinus Torvalds goto out; 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds if (exp2 && ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2))) { 1161da177e4SLinus Torvalds /* successfully crossed mount point */ 1171da177e4SLinus Torvalds exp_put(exp); 1181da177e4SLinus Torvalds *expp = exp2; 1191da177e4SLinus Torvalds dput(dentry); 1201da177e4SLinus Torvalds *dpp = mounts; 1211da177e4SLinus Torvalds } else { 1221da177e4SLinus Torvalds if (exp2) exp_put(exp2); 1231da177e4SLinus Torvalds dput(mounts); 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds mntput(mnt); 1261da177e4SLinus Torvalds out: 1271da177e4SLinus Torvalds return err; 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds /* 1311da177e4SLinus Torvalds * Look up one component of a pathname. 1321da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfh need an fh_put 1331da177e4SLinus Torvalds * 1341da177e4SLinus Torvalds * If the lookup would cross a mountpoint, and the mounted filesystem 1351da177e4SLinus Torvalds * is exported to the client with NFSEXP_NOHIDE, then the lookup is 1361da177e4SLinus Torvalds * accepted as it stands and the mounted directory is 1371da177e4SLinus Torvalds * returned. Otherwise the covered directory is returned. 1381da177e4SLinus Torvalds * NOTE: this mountpoint crossing is not supported properly by all 1391da177e4SLinus Torvalds * clients and is explicitly disallowed for NFSv3 1401da177e4SLinus Torvalds * NeilBrown <neilb@cse.unsw.edu.au> 1411da177e4SLinus Torvalds */ 1421da177e4SLinus Torvalds int 1431da177e4SLinus Torvalds nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 1441da177e4SLinus Torvalds int len, struct svc_fh *resfh) 1451da177e4SLinus Torvalds { 1461da177e4SLinus Torvalds struct svc_export *exp; 1471da177e4SLinus Torvalds struct dentry *dparent; 1481da177e4SLinus Torvalds struct dentry *dentry; 1491da177e4SLinus Torvalds int err; 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds /* Obtain dentry and export. */ 1541da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC); 1551da177e4SLinus Torvalds if (err) 1561da177e4SLinus Torvalds return err; 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds dparent = fhp->fh_dentry; 1591da177e4SLinus Torvalds exp = fhp->fh_export; 1601da177e4SLinus Torvalds exp_get(exp); 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds err = nfserr_acces; 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds /* Lookup the name, but don't follow links */ 1651da177e4SLinus Torvalds if (isdotent(name, len)) { 1661da177e4SLinus Torvalds if (len==1) 1671da177e4SLinus Torvalds dentry = dget(dparent); 1681da177e4SLinus Torvalds else if (dparent != exp->ex_dentry) { 1691da177e4SLinus Torvalds dentry = dget_parent(dparent); 1701da177e4SLinus Torvalds } else if (!EX_NOHIDE(exp)) 1711da177e4SLinus Torvalds dentry = dget(dparent); /* .. == . just like at / */ 1721da177e4SLinus Torvalds else { 1731da177e4SLinus Torvalds /* checking mountpoint crossing is very different when stepping up */ 1741da177e4SLinus Torvalds struct svc_export *exp2 = NULL; 1751da177e4SLinus Torvalds struct dentry *dp; 1761da177e4SLinus Torvalds struct vfsmount *mnt = mntget(exp->ex_mnt); 1771da177e4SLinus Torvalds dentry = dget(dparent); 1781da177e4SLinus Torvalds while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry)) 1791da177e4SLinus Torvalds ; 1801da177e4SLinus Torvalds dp = dget_parent(dentry); 1811da177e4SLinus Torvalds dput(dentry); 1821da177e4SLinus Torvalds dentry = dp; 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds exp2 = exp_parent(exp->ex_client, mnt, dentry, 1851da177e4SLinus Torvalds &rqstp->rq_chandle); 1861da177e4SLinus Torvalds if (IS_ERR(exp2)) { 1871da177e4SLinus Torvalds err = PTR_ERR(exp2); 1881da177e4SLinus Torvalds dput(dentry); 1891da177e4SLinus Torvalds mntput(mnt); 1901da177e4SLinus Torvalds goto out_nfserr; 1911da177e4SLinus Torvalds } 1921da177e4SLinus Torvalds if (!exp2) { 1931da177e4SLinus Torvalds dput(dentry); 1941da177e4SLinus Torvalds dentry = dget(dparent); 1951da177e4SLinus Torvalds } else { 1961da177e4SLinus Torvalds exp_put(exp); 1971da177e4SLinus Torvalds exp = exp2; 1981da177e4SLinus Torvalds } 1991da177e4SLinus Torvalds mntput(mnt); 2001da177e4SLinus Torvalds } 2011da177e4SLinus Torvalds } else { 2021da177e4SLinus Torvalds fh_lock(fhp); 2031da177e4SLinus Torvalds dentry = lookup_one_len(name, dparent, len); 2041da177e4SLinus Torvalds err = PTR_ERR(dentry); 2051da177e4SLinus Torvalds if (IS_ERR(dentry)) 2061da177e4SLinus Torvalds goto out_nfserr; 2071da177e4SLinus Torvalds /* 2081da177e4SLinus Torvalds * check if we have crossed a mount point ... 2091da177e4SLinus Torvalds */ 2101da177e4SLinus Torvalds if (d_mountpoint(dentry)) { 2111da177e4SLinus Torvalds if ((err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 2121da177e4SLinus Torvalds dput(dentry); 2131da177e4SLinus Torvalds goto out_nfserr; 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds } 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds /* 2181da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2191da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2201da177e4SLinus Torvalds */ 2211da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2221da177e4SLinus Torvalds if (!err && !dentry->d_inode) 2231da177e4SLinus Torvalds err = nfserr_noent; 2241da177e4SLinus Torvalds dput(dentry); 2251da177e4SLinus Torvalds out: 2261da177e4SLinus Torvalds exp_put(exp); 2271da177e4SLinus Torvalds return err; 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds out_nfserr: 2301da177e4SLinus Torvalds err = nfserrno(err); 2311da177e4SLinus Torvalds goto out; 2321da177e4SLinus Torvalds } 2331da177e4SLinus Torvalds 2341da177e4SLinus Torvalds /* 2351da177e4SLinus Torvalds * Set various file attributes. 2361da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 2371da177e4SLinus Torvalds */ 2381da177e4SLinus Torvalds int 2391da177e4SLinus Torvalds nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 2401da177e4SLinus Torvalds int check_guard, time_t guardtime) 2411da177e4SLinus Torvalds { 2421da177e4SLinus Torvalds struct dentry *dentry; 2431da177e4SLinus Torvalds struct inode *inode; 2441da177e4SLinus Torvalds int accmode = MAY_SATTR; 2451da177e4SLinus Torvalds int ftype = 0; 2461da177e4SLinus Torvalds int imode; 2471da177e4SLinus Torvalds int err; 2481da177e4SLinus Torvalds int size_change = 0; 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) 2511da177e4SLinus Torvalds accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE; 2521da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) 2531da177e4SLinus Torvalds ftype = S_IFREG; 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds /* Get inode */ 2561da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 2571da177e4SLinus Torvalds if (err || !iap->ia_valid) 2581da177e4SLinus Torvalds goto out; 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds dentry = fhp->fh_dentry; 2611da177e4SLinus Torvalds inode = dentry->d_inode; 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds /* NFSv2 does not differentiate between "set-[ac]time-to-now" 2641da177e4SLinus Torvalds * which only requires access, and "set-[ac]time-to-X" which 2651da177e4SLinus Torvalds * requires ownership. 2661da177e4SLinus Torvalds * So if it looks like it might be "set both to the same time which 2671da177e4SLinus Torvalds * is close to now", and if inode_change_ok fails, then we 2681da177e4SLinus Torvalds * convert to "set to now" instead of "set to explicit time" 2691da177e4SLinus Torvalds * 2701da177e4SLinus Torvalds * We only call inode_change_ok as the last test as technically 2711da177e4SLinus Torvalds * it is not an interface that we should be using. It is only 2721da177e4SLinus Torvalds * valid if the filesystem does not define it's own i_op->setattr. 2731da177e4SLinus Torvalds */ 2741da177e4SLinus Torvalds #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) 2751da177e4SLinus Torvalds #define MAX_TOUCH_TIME_ERROR (30*60) 2761da177e4SLinus Torvalds if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET 2771da177e4SLinus Torvalds && iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec 2781da177e4SLinus Torvalds ) { 2791da177e4SLinus Torvalds /* Looks probable. Now just make sure time is in the right ballpark. 2801da177e4SLinus Torvalds * Solaris, at least, doesn't seem to care what the time request is. 2811da177e4SLinus Torvalds * We require it be within 30 minutes of now. 2821da177e4SLinus Torvalds */ 2831da177e4SLinus Torvalds time_t delta = iap->ia_atime.tv_sec - get_seconds(); 2841da177e4SLinus Torvalds if (delta<0) delta = -delta; 2851da177e4SLinus Torvalds if (delta < MAX_TOUCH_TIME_ERROR && 2861da177e4SLinus Torvalds inode_change_ok(inode, iap) != 0) { 2871da177e4SLinus Torvalds /* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME 2881da177e4SLinus Torvalds * this will cause notify_change to set these times to "now" 2891da177e4SLinus Torvalds */ 2901da177e4SLinus Torvalds iap->ia_valid &= ~BOTH_TIME_SET; 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds } 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds /* The size case is special. It changes the file as well as the attributes. */ 2951da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) { 2961da177e4SLinus Torvalds if (iap->ia_size < inode->i_size) { 2971da177e4SLinus Torvalds err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE); 2981da177e4SLinus Torvalds if (err) 2991da177e4SLinus Torvalds goto out; 3001da177e4SLinus Torvalds } 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds /* 3031da177e4SLinus Torvalds * If we are changing the size of the file, then 3041da177e4SLinus Torvalds * we need to break all leases. 3051da177e4SLinus Torvalds */ 3061da177e4SLinus Torvalds err = break_lease(inode, FMODE_WRITE | O_NONBLOCK); 3071da177e4SLinus Torvalds if (err == -EWOULDBLOCK) 3081da177e4SLinus Torvalds err = -ETIMEDOUT; 3091da177e4SLinus Torvalds if (err) /* ENOMEM or EWOULDBLOCK */ 3101da177e4SLinus Torvalds goto out_nfserr; 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds err = get_write_access(inode); 3131da177e4SLinus Torvalds if (err) 3141da177e4SLinus Torvalds goto out_nfserr; 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds size_change = 1; 3171da177e4SLinus Torvalds err = locks_verify_truncate(inode, NULL, iap->ia_size); 3181da177e4SLinus Torvalds if (err) { 3191da177e4SLinus Torvalds put_write_access(inode); 3201da177e4SLinus Torvalds goto out_nfserr; 3211da177e4SLinus Torvalds } 3221da177e4SLinus Torvalds DQUOT_INIT(inode); 3231da177e4SLinus Torvalds } 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds imode = inode->i_mode; 3261da177e4SLinus Torvalds if (iap->ia_valid & ATTR_MODE) { 3271da177e4SLinus Torvalds iap->ia_mode &= S_IALLUGO; 3281da177e4SLinus Torvalds imode = iap->ia_mode |= (imode & ~S_IALLUGO); 3291da177e4SLinus Torvalds } 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds /* Revoke setuid/setgid bit on chown/chgrp */ 3321da177e4SLinus Torvalds if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) 3331da177e4SLinus Torvalds iap->ia_valid |= ATTR_KILL_SUID; 3341da177e4SLinus Torvalds if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid) 3351da177e4SLinus Torvalds iap->ia_valid |= ATTR_KILL_SGID; 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds /* Change the attributes. */ 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds err = nfserr_notsync; 3421da177e4SLinus Torvalds if (!check_guard || guardtime == inode->i_ctime.tv_sec) { 3431da177e4SLinus Torvalds fh_lock(fhp); 3441da177e4SLinus Torvalds err = notify_change(dentry, iap); 3451da177e4SLinus Torvalds err = nfserrno(err); 3461da177e4SLinus Torvalds fh_unlock(fhp); 3471da177e4SLinus Torvalds } 3481da177e4SLinus Torvalds if (size_change) 3491da177e4SLinus Torvalds put_write_access(inode); 3501da177e4SLinus Torvalds if (!err) 3511da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 3521da177e4SLinus Torvalds write_inode_now(inode, 1); 3531da177e4SLinus Torvalds out: 3541da177e4SLinus Torvalds return err; 3551da177e4SLinus Torvalds 3561da177e4SLinus Torvalds out_nfserr: 3571da177e4SLinus Torvalds err = nfserrno(err); 3581da177e4SLinus Torvalds goto out; 3591da177e4SLinus Torvalds } 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds #if defined(CONFIG_NFSD_V4) 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds static int 3641da177e4SLinus Torvalds set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) 3651da177e4SLinus Torvalds { 3661da177e4SLinus Torvalds int len; 3671da177e4SLinus Torvalds size_t buflen; 3681da177e4SLinus Torvalds char *buf = NULL; 3691da177e4SLinus Torvalds int error = 0; 3701da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds buflen = posix_acl_xattr_size(pacl->a_count); 3731da177e4SLinus Torvalds buf = kmalloc(buflen, GFP_KERNEL); 3741da177e4SLinus Torvalds error = -ENOMEM; 3751da177e4SLinus Torvalds if (buf == NULL) 3761da177e4SLinus Torvalds goto out; 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds len = posix_acl_to_xattr(pacl, buf, buflen); 3791da177e4SLinus Torvalds if (len < 0) { 3801da177e4SLinus Torvalds error = len; 3811da177e4SLinus Torvalds goto out; 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 3841da177e4SLinus Torvalds error = -EOPNOTSUPP; 3851da177e4SLinus Torvalds if (inode->i_op && inode->i_op->setxattr) { 3861da177e4SLinus Torvalds down(&inode->i_sem); 3871da177e4SLinus Torvalds security_inode_setxattr(dentry, key, buf, len, 0); 3881da177e4SLinus Torvalds error = inode->i_op->setxattr(dentry, key, buf, len, 0); 3891da177e4SLinus Torvalds if (!error) 3901da177e4SLinus Torvalds security_inode_post_setxattr(dentry, key, buf, len, 0); 3911da177e4SLinus Torvalds up(&inode->i_sem); 3921da177e4SLinus Torvalds } 3931da177e4SLinus Torvalds out: 3941da177e4SLinus Torvalds kfree(buf); 3951da177e4SLinus Torvalds return error; 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds 3981da177e4SLinus Torvalds int 3991da177e4SLinus Torvalds nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, 4001da177e4SLinus Torvalds struct nfs4_acl *acl) 4011da177e4SLinus Torvalds { 4021da177e4SLinus Torvalds int error; 4031da177e4SLinus Torvalds struct dentry *dentry; 4041da177e4SLinus Torvalds struct inode *inode; 4051da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 4061da177e4SLinus Torvalds unsigned int flags = 0; 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds /* Get inode */ 4091da177e4SLinus Torvalds error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR); 4101da177e4SLinus Torvalds if (error) 4111da177e4SLinus Torvalds goto out; 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds dentry = fhp->fh_dentry; 4141da177e4SLinus Torvalds inode = dentry->d_inode; 4151da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) 4161da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); 4191da177e4SLinus Torvalds if (error == -EINVAL) { 4201da177e4SLinus Torvalds error = nfserr_attrnotsupp; 4211da177e4SLinus Torvalds goto out; 4221da177e4SLinus Torvalds } else if (error < 0) 4231da177e4SLinus Torvalds goto out_nfserr; 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds if (pacl) { 4269a59f452SChristoph Hellwig error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); 4271da177e4SLinus Torvalds if (error < 0) 4281da177e4SLinus Torvalds goto out_nfserr; 4291da177e4SLinus Torvalds } 4301da177e4SLinus Torvalds 4311da177e4SLinus Torvalds if (dpacl) { 4329a59f452SChristoph Hellwig error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); 4331da177e4SLinus Torvalds if (error < 0) 4341da177e4SLinus Torvalds goto out_nfserr; 4351da177e4SLinus Torvalds } 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds error = nfs_ok; 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds out: 4401da177e4SLinus Torvalds posix_acl_release(pacl); 4411da177e4SLinus Torvalds posix_acl_release(dpacl); 4421da177e4SLinus Torvalds return (error); 4431da177e4SLinus Torvalds out_nfserr: 4441da177e4SLinus Torvalds error = nfserrno(error); 4451da177e4SLinus Torvalds goto out; 4461da177e4SLinus Torvalds } 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds static struct posix_acl * 4491da177e4SLinus Torvalds _get_posix_acl(struct dentry *dentry, char *key) 4501da177e4SLinus Torvalds { 4511da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 4521da177e4SLinus Torvalds char *buf = NULL; 4531da177e4SLinus Torvalds int buflen, error = 0; 4541da177e4SLinus Torvalds struct posix_acl *pacl = NULL; 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds error = -EOPNOTSUPP; 4571da177e4SLinus Torvalds if (inode->i_op == NULL) 4581da177e4SLinus Torvalds goto out_err; 4591da177e4SLinus Torvalds if (inode->i_op->getxattr == NULL) 4601da177e4SLinus Torvalds goto out_err; 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds error = security_inode_getxattr(dentry, key); 4631da177e4SLinus Torvalds if (error) 4641da177e4SLinus Torvalds goto out_err; 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds buflen = inode->i_op->getxattr(dentry, key, NULL, 0); 4671da177e4SLinus Torvalds if (buflen <= 0) { 4681da177e4SLinus Torvalds error = buflen < 0 ? buflen : -ENODATA; 4691da177e4SLinus Torvalds goto out_err; 4701da177e4SLinus Torvalds } 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds buf = kmalloc(buflen, GFP_KERNEL); 4731da177e4SLinus Torvalds if (buf == NULL) { 4741da177e4SLinus Torvalds error = -ENOMEM; 4751da177e4SLinus Torvalds goto out_err; 4761da177e4SLinus Torvalds } 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds error = inode->i_op->getxattr(dentry, key, buf, buflen); 4791da177e4SLinus Torvalds if (error < 0) 4801da177e4SLinus Torvalds goto out_err; 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds pacl = posix_acl_from_xattr(buf, buflen); 4831da177e4SLinus Torvalds out: 4841da177e4SLinus Torvalds kfree(buf); 4851da177e4SLinus Torvalds return pacl; 4861da177e4SLinus Torvalds out_err: 4871da177e4SLinus Torvalds pacl = ERR_PTR(error); 4881da177e4SLinus Torvalds goto out; 4891da177e4SLinus Torvalds } 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds int 4921da177e4SLinus Torvalds nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) 4931da177e4SLinus Torvalds { 4941da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 4951da177e4SLinus Torvalds int error = 0; 4961da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 4971da177e4SLinus Torvalds unsigned int flags = 0; 4981da177e4SLinus Torvalds 4999a59f452SChristoph Hellwig pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); 5001da177e4SLinus Torvalds if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) 5011da177e4SLinus Torvalds pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 5021da177e4SLinus Torvalds if (IS_ERR(pacl)) { 5031da177e4SLinus Torvalds error = PTR_ERR(pacl); 5041da177e4SLinus Torvalds pacl = NULL; 5051da177e4SLinus Torvalds goto out; 5061da177e4SLinus Torvalds } 5071da177e4SLinus Torvalds 5081da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) { 5099a59f452SChristoph Hellwig dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); 5101da177e4SLinus Torvalds if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) 5111da177e4SLinus Torvalds dpacl = NULL; 5121da177e4SLinus Torvalds else if (IS_ERR(dpacl)) { 5131da177e4SLinus Torvalds error = PTR_ERR(dpacl); 5141da177e4SLinus Torvalds dpacl = NULL; 5151da177e4SLinus Torvalds goto out; 5161da177e4SLinus Torvalds } 5171da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5181da177e4SLinus Torvalds } 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); 5211da177e4SLinus Torvalds if (IS_ERR(*acl)) { 5221da177e4SLinus Torvalds error = PTR_ERR(*acl); 5231da177e4SLinus Torvalds *acl = NULL; 5241da177e4SLinus Torvalds } 5251da177e4SLinus Torvalds out: 5261da177e4SLinus Torvalds posix_acl_release(pacl); 5271da177e4SLinus Torvalds posix_acl_release(dpacl); 5281da177e4SLinus Torvalds return error; 5291da177e4SLinus Torvalds } 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds #endif /* defined(CONFIG_NFS_V4) */ 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 5341da177e4SLinus Torvalds /* 5351da177e4SLinus Torvalds * Check server access rights to a file system object 5361da177e4SLinus Torvalds */ 5371da177e4SLinus Torvalds struct accessmap { 5381da177e4SLinus Torvalds u32 access; 5391da177e4SLinus Torvalds int how; 5401da177e4SLinus Torvalds }; 5411da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 5421da177e4SLinus Torvalds { NFS3_ACCESS_READ, MAY_READ }, 5431da177e4SLinus Torvalds { NFS3_ACCESS_EXECUTE, MAY_EXEC }, 5441da177e4SLinus Torvalds { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_TRUNC }, 5451da177e4SLinus Torvalds { NFS3_ACCESS_EXTEND, MAY_WRITE }, 5461da177e4SLinus Torvalds 5471da177e4SLinus Torvalds { 0, 0 } 5481da177e4SLinus Torvalds }; 5491da177e4SLinus Torvalds 5501da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 5511da177e4SLinus Torvalds { NFS3_ACCESS_READ, MAY_READ }, 5521da177e4SLinus Torvalds { NFS3_ACCESS_LOOKUP, MAY_EXEC }, 5531da177e4SLinus Torvalds { NFS3_ACCESS_MODIFY, MAY_EXEC|MAY_WRITE|MAY_TRUNC }, 5541da177e4SLinus Torvalds { NFS3_ACCESS_EXTEND, MAY_EXEC|MAY_WRITE }, 5551da177e4SLinus Torvalds { NFS3_ACCESS_DELETE, MAY_REMOVE }, 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds { 0, 0 } 5581da177e4SLinus Torvalds }; 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 5611da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 5621da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 5631da177e4SLinus Torvalds * (which really, the server doesn't care about). So 5641da177e4SLinus Torvalds * We provide simple access checking for them, looking 5651da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 5661da177e4SLinus Torvalds * filesystem checks 5671da177e4SLinus Torvalds */ 5681da177e4SLinus Torvalds { NFS3_ACCESS_READ, MAY_READ }, 5691da177e4SLinus Torvalds { NFS3_ACCESS_EXECUTE, MAY_EXEC }, 5701da177e4SLinus Torvalds { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_LOCAL_ACCESS }, 5711da177e4SLinus Torvalds { NFS3_ACCESS_EXTEND, MAY_WRITE|MAY_LOCAL_ACCESS }, 5721da177e4SLinus Torvalds 5731da177e4SLinus Torvalds { 0, 0 } 5741da177e4SLinus Torvalds }; 5751da177e4SLinus Torvalds 5761da177e4SLinus Torvalds int 5771da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 5781da177e4SLinus Torvalds { 5791da177e4SLinus Torvalds struct accessmap *map; 5801da177e4SLinus Torvalds struct svc_export *export; 5811da177e4SLinus Torvalds struct dentry *dentry; 5821da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 5831da177e4SLinus Torvalds unsigned int error; 5841da177e4SLinus Torvalds 5851da177e4SLinus Torvalds error = fh_verify(rqstp, fhp, 0, MAY_NOP); 5861da177e4SLinus Torvalds if (error) 5871da177e4SLinus Torvalds goto out; 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvalds export = fhp->fh_export; 5901da177e4SLinus Torvalds dentry = fhp->fh_dentry; 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds if (S_ISREG(dentry->d_inode->i_mode)) 5931da177e4SLinus Torvalds map = nfs3_regaccess; 5941da177e4SLinus Torvalds else if (S_ISDIR(dentry->d_inode->i_mode)) 5951da177e4SLinus Torvalds map = nfs3_diraccess; 5961da177e4SLinus Torvalds else 5971da177e4SLinus Torvalds map = nfs3_anyaccess; 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds query = *access; 6011da177e4SLinus Torvalds for (; map->access; map++) { 6021da177e4SLinus Torvalds if (map->access & query) { 6031da177e4SLinus Torvalds unsigned int err2; 6041da177e4SLinus Torvalds 6051da177e4SLinus Torvalds sresult |= map->access; 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvalds err2 = nfsd_permission(export, dentry, map->how); 6081da177e4SLinus Torvalds switch (err2) { 6091da177e4SLinus Torvalds case nfs_ok: 6101da177e4SLinus Torvalds result |= map->access; 6111da177e4SLinus Torvalds break; 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 6141da177e4SLinus Torvalds * rather than an error occurred */ 6151da177e4SLinus Torvalds case nfserr_rofs: 6161da177e4SLinus Torvalds case nfserr_acces: 6171da177e4SLinus Torvalds case nfserr_perm: 6181da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 6191da177e4SLinus Torvalds break; 6201da177e4SLinus Torvalds default: 6211da177e4SLinus Torvalds error = err2; 6221da177e4SLinus Torvalds goto out; 6231da177e4SLinus Torvalds } 6241da177e4SLinus Torvalds } 6251da177e4SLinus Torvalds } 6261da177e4SLinus Torvalds *access = result; 6271da177e4SLinus Torvalds if (supported) 6281da177e4SLinus Torvalds *supported = sresult; 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds out: 6311da177e4SLinus Torvalds return error; 6321da177e4SLinus Torvalds } 6331da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 6341da177e4SLinus Torvalds 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds /* 6381da177e4SLinus Torvalds * Open an existing file or directory. 6391da177e4SLinus Torvalds * The access argument indicates the type of open (read/write/lock) 6401da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 6411da177e4SLinus Torvalds */ 6421da177e4SLinus Torvalds int 6431da177e4SLinus Torvalds nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 6441da177e4SLinus Torvalds int access, struct file **filp) 6451da177e4SLinus Torvalds { 6461da177e4SLinus Torvalds struct dentry *dentry; 6471da177e4SLinus Torvalds struct inode *inode; 6481da177e4SLinus Torvalds int flags = O_RDONLY|O_LARGEFILE, err; 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds /* 6511da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 6521da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 6531da177e4SLinus Torvalds * in case a chmod has now revoked permission. 6541da177e4SLinus Torvalds */ 6551da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE); 6561da177e4SLinus Torvalds if (err) 6571da177e4SLinus Torvalds goto out; 6581da177e4SLinus Torvalds 6591da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6601da177e4SLinus Torvalds inode = dentry->d_inode; 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 6631da177e4SLinus Torvalds * or any access when mandatory locking enabled 6641da177e4SLinus Torvalds */ 6651da177e4SLinus Torvalds err = nfserr_perm; 6661da177e4SLinus Torvalds if (IS_APPEND(inode) && (access & MAY_WRITE)) 6671da177e4SLinus Torvalds goto out; 6681da177e4SLinus Torvalds if (IS_ISMNDLK(inode)) 6691da177e4SLinus Torvalds goto out; 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds if (!inode->i_fop) 6721da177e4SLinus Torvalds goto out; 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds /* 6751da177e4SLinus Torvalds * Check to see if there are any leases on this file. 6761da177e4SLinus Torvalds * This may block while leases are broken. 6771da177e4SLinus Torvalds */ 6781da177e4SLinus Torvalds err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0)); 6791da177e4SLinus Torvalds if (err == -EWOULDBLOCK) 6801da177e4SLinus Torvalds err = -ETIMEDOUT; 6811da177e4SLinus Torvalds if (err) /* NOMEM or WOULDBLOCK */ 6821da177e4SLinus Torvalds goto out_nfserr; 6831da177e4SLinus Torvalds 6841da177e4SLinus Torvalds if (access & MAY_WRITE) { 6851da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds DQUOT_INIT(inode); 6881da177e4SLinus Torvalds } 6891da177e4SLinus Torvalds *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags); 6901da177e4SLinus Torvalds if (IS_ERR(*filp)) 6911da177e4SLinus Torvalds err = PTR_ERR(*filp); 6921da177e4SLinus Torvalds out_nfserr: 6931da177e4SLinus Torvalds if (err) 6941da177e4SLinus Torvalds err = nfserrno(err); 6951da177e4SLinus Torvalds out: 6961da177e4SLinus Torvalds return err; 6971da177e4SLinus Torvalds } 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds /* 7001da177e4SLinus Torvalds * Close a file. 7011da177e4SLinus Torvalds */ 7021da177e4SLinus Torvalds void 7031da177e4SLinus Torvalds nfsd_close(struct file *filp) 7041da177e4SLinus Torvalds { 7051da177e4SLinus Torvalds fput(filp); 7061da177e4SLinus Torvalds } 7071da177e4SLinus Torvalds 7081da177e4SLinus Torvalds /* 7091da177e4SLinus Torvalds * Sync a file 7101da177e4SLinus Torvalds * As this calls fsync (not fdatasync) there is no need for a write_inode 7111da177e4SLinus Torvalds * after it. 7121da177e4SLinus Torvalds */ 7131da177e4SLinus Torvalds static inline void nfsd_dosync(struct file *filp, struct dentry *dp, 7141da177e4SLinus Torvalds struct file_operations *fop) 7151da177e4SLinus Torvalds { 7161da177e4SLinus Torvalds struct inode *inode = dp->d_inode; 7171da177e4SLinus Torvalds int (*fsync) (struct file *, struct dentry *, int); 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds filemap_fdatawrite(inode->i_mapping); 7201da177e4SLinus Torvalds if (fop && (fsync = fop->fsync)) 7211da177e4SLinus Torvalds fsync(filp, dp, 0); 7221da177e4SLinus Torvalds filemap_fdatawait(inode->i_mapping); 7231da177e4SLinus Torvalds } 7241da177e4SLinus Torvalds 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds static void 7271da177e4SLinus Torvalds nfsd_sync(struct file *filp) 7281da177e4SLinus Torvalds { 7291da177e4SLinus Torvalds struct inode *inode = filp->f_dentry->d_inode; 7301da177e4SLinus Torvalds dprintk("nfsd: sync file %s\n", filp->f_dentry->d_name.name); 7311da177e4SLinus Torvalds down(&inode->i_sem); 7321da177e4SLinus Torvalds nfsd_dosync(filp, filp->f_dentry, filp->f_op); 7331da177e4SLinus Torvalds up(&inode->i_sem); 7341da177e4SLinus Torvalds } 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds static void 7371da177e4SLinus Torvalds nfsd_sync_dir(struct dentry *dp) 7381da177e4SLinus Torvalds { 7391da177e4SLinus Torvalds nfsd_dosync(NULL, dp, dp->d_inode->i_fop); 7401da177e4SLinus Torvalds } 7411da177e4SLinus Torvalds 7421da177e4SLinus Torvalds /* 7431da177e4SLinus Torvalds * Obtain the readahead parameters for the file 7441da177e4SLinus Torvalds * specified by (dev, ino). 7451da177e4SLinus Torvalds */ 7461da177e4SLinus Torvalds static DEFINE_SPINLOCK(ra_lock); 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds static inline struct raparms * 7491da177e4SLinus Torvalds nfsd_get_raparms(dev_t dev, ino_t ino) 7501da177e4SLinus Torvalds { 7511da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 7521da177e4SLinus Torvalds int depth = 0; 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds spin_lock(&ra_lock); 7551da177e4SLinus Torvalds for (rap = &raparm_cache; (ra = *rap); rap = &ra->p_next) { 7561da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 7571da177e4SLinus Torvalds goto found; 7581da177e4SLinus Torvalds depth++; 7591da177e4SLinus Torvalds if (ra->p_count == 0) 7601da177e4SLinus Torvalds frap = rap; 7611da177e4SLinus Torvalds } 7621da177e4SLinus Torvalds depth = nfsdstats.ra_size*11/10; 7631da177e4SLinus Torvalds if (!frap) { 7641da177e4SLinus Torvalds spin_unlock(&ra_lock); 7651da177e4SLinus Torvalds return NULL; 7661da177e4SLinus Torvalds } 7671da177e4SLinus Torvalds rap = frap; 7681da177e4SLinus Torvalds ra = *frap; 7691da177e4SLinus Torvalds ra->p_dev = dev; 7701da177e4SLinus Torvalds ra->p_ino = ino; 7711da177e4SLinus Torvalds ra->p_set = 0; 7721da177e4SLinus Torvalds found: 7731da177e4SLinus Torvalds if (rap != &raparm_cache) { 7741da177e4SLinus Torvalds *rap = ra->p_next; 7751da177e4SLinus Torvalds ra->p_next = raparm_cache; 7761da177e4SLinus Torvalds raparm_cache = ra; 7771da177e4SLinus Torvalds } 7781da177e4SLinus Torvalds ra->p_count++; 7791da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 7801da177e4SLinus Torvalds spin_unlock(&ra_lock); 7811da177e4SLinus Torvalds return ra; 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvalds /* 7851da177e4SLinus Torvalds * Grab and keep cached pages assosiated with a file in the svc_rqst 7861da177e4SLinus Torvalds * so that they can be passed to the netowork sendmsg/sendpage routines 7871da177e4SLinus Torvalds * directrly. They will be released after the sending has completed. 7881da177e4SLinus Torvalds */ 7891da177e4SLinus Torvalds static int 7901da177e4SLinus Torvalds nfsd_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset , unsigned long size) 7911da177e4SLinus Torvalds { 7921da177e4SLinus Torvalds unsigned long count = desc->count; 7931da177e4SLinus Torvalds struct svc_rqst *rqstp = desc->arg.data; 7941da177e4SLinus Torvalds 7951da177e4SLinus Torvalds if (size > count) 7961da177e4SLinus Torvalds size = count; 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 7991da177e4SLinus Torvalds get_page(page); 8001da177e4SLinus Torvalds rqstp->rq_respages[rqstp->rq_resused++] = page; 8011da177e4SLinus Torvalds rqstp->rq_res.page_base = offset; 8021da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 8031da177e4SLinus Torvalds } else if (page != rqstp->rq_respages[rqstp->rq_resused-1]) { 8041da177e4SLinus Torvalds get_page(page); 8051da177e4SLinus Torvalds rqstp->rq_respages[rqstp->rq_resused++] = page; 8061da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8071da177e4SLinus Torvalds } else { 8081da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8091da177e4SLinus Torvalds } 8101da177e4SLinus Torvalds 8111da177e4SLinus Torvalds desc->count = count - size; 8121da177e4SLinus Torvalds desc->written += size; 8131da177e4SLinus Torvalds return size; 8141da177e4SLinus Torvalds } 8151da177e4SLinus Torvalds 8161da177e4SLinus Torvalds static inline int 8171da177e4SLinus Torvalds nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 8181da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 8191da177e4SLinus Torvalds { 8201da177e4SLinus Torvalds struct inode *inode; 8211da177e4SLinus Torvalds struct raparms *ra; 8221da177e4SLinus Torvalds mm_segment_t oldfs; 8231da177e4SLinus Torvalds int err; 8241da177e4SLinus Torvalds 8251da177e4SLinus Torvalds err = nfserr_perm; 8261da177e4SLinus Torvalds inode = file->f_dentry->d_inode; 8271da177e4SLinus Torvalds #ifdef MSNFS 8281da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 8291da177e4SLinus Torvalds (!lock_may_read(inode, offset, *count))) 8301da177e4SLinus Torvalds goto out; 8311da177e4SLinus Torvalds #endif 8321da177e4SLinus Torvalds 8331da177e4SLinus Torvalds /* Get readahead parameters */ 8341da177e4SLinus Torvalds ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvalds if (ra && ra->p_set) 8371da177e4SLinus Torvalds file->f_ra = ra->p_ra; 8381da177e4SLinus Torvalds 8391da177e4SLinus Torvalds if (file->f_op->sendfile) { 8401da177e4SLinus Torvalds svc_pushback_unused_pages(rqstp); 8411da177e4SLinus Torvalds err = file->f_op->sendfile(file, &offset, *count, 8421da177e4SLinus Torvalds nfsd_read_actor, rqstp); 8431da177e4SLinus Torvalds } else { 8441da177e4SLinus Torvalds oldfs = get_fs(); 8451da177e4SLinus Torvalds set_fs(KERNEL_DS); 8461da177e4SLinus Torvalds err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); 8471da177e4SLinus Torvalds set_fs(oldfs); 8481da177e4SLinus Torvalds } 8491da177e4SLinus Torvalds 8501da177e4SLinus Torvalds /* Write back readahead params */ 8511da177e4SLinus Torvalds if (ra) { 8521da177e4SLinus Torvalds spin_lock(&ra_lock); 8531da177e4SLinus Torvalds ra->p_ra = file->f_ra; 8541da177e4SLinus Torvalds ra->p_set = 1; 8551da177e4SLinus Torvalds ra->p_count--; 8561da177e4SLinus Torvalds spin_unlock(&ra_lock); 8571da177e4SLinus Torvalds } 8581da177e4SLinus Torvalds 8591da177e4SLinus Torvalds if (err >= 0) { 8601da177e4SLinus Torvalds nfsdstats.io_read += err; 8611da177e4SLinus Torvalds *count = err; 8621da177e4SLinus Torvalds err = 0; 8631da177e4SLinus Torvalds dnotify_parent(file->f_dentry, DN_ACCESS); 8641da177e4SLinus Torvalds } else 8651da177e4SLinus Torvalds err = nfserrno(err); 8661da177e4SLinus Torvalds out: 8671da177e4SLinus Torvalds return err; 8681da177e4SLinus Torvalds } 8691da177e4SLinus Torvalds 8701da177e4SLinus Torvalds static inline int 8711da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 8721da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 8731da177e4SLinus Torvalds unsigned long cnt, int *stablep) 8741da177e4SLinus Torvalds { 8751da177e4SLinus Torvalds struct svc_export *exp; 8761da177e4SLinus Torvalds struct dentry *dentry; 8771da177e4SLinus Torvalds struct inode *inode; 8781da177e4SLinus Torvalds mm_segment_t oldfs; 8791da177e4SLinus Torvalds int err = 0; 8801da177e4SLinus Torvalds int stable = *stablep; 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds err = nfserr_perm; 8831da177e4SLinus Torvalds 8841da177e4SLinus Torvalds #ifdef MSNFS 8851da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 8861da177e4SLinus Torvalds (!lock_may_write(file->f_dentry->d_inode, offset, cnt))) 8871da177e4SLinus Torvalds goto out; 8881da177e4SLinus Torvalds #endif 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds dentry = file->f_dentry; 8911da177e4SLinus Torvalds inode = dentry->d_inode; 8921da177e4SLinus Torvalds exp = fhp->fh_export; 8931da177e4SLinus Torvalds 8941da177e4SLinus Torvalds /* 8951da177e4SLinus Torvalds * Request sync writes if 8961da177e4SLinus Torvalds * - the sync export option has been set, or 8971da177e4SLinus Torvalds * - the client requested O_SYNC behavior (NFSv3 feature). 8981da177e4SLinus Torvalds * - The file system doesn't support fsync(). 8991da177e4SLinus Torvalds * When gathered writes have been configured for this volume, 9001da177e4SLinus Torvalds * flushing the data to disk is handled separately below. 9011da177e4SLinus Torvalds */ 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */ 9041da177e4SLinus Torvalds stable = 2; 9051da177e4SLinus Torvalds *stablep = 2; /* FILE_SYNC */ 9061da177e4SLinus Torvalds } 9071da177e4SLinus Torvalds 9081da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 9091da177e4SLinus Torvalds stable = 0; 9101da177e4SLinus Torvalds if (stable && !EX_WGATHER(exp)) 9111da177e4SLinus Torvalds file->f_flags |= O_SYNC; 9121da177e4SLinus Torvalds 9131da177e4SLinus Torvalds /* Write the data. */ 9141da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 9151da177e4SLinus Torvalds err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); 9161da177e4SLinus Torvalds set_fs(oldfs); 9171da177e4SLinus Torvalds if (err >= 0) { 9181da177e4SLinus Torvalds nfsdstats.io_write += cnt; 9191da177e4SLinus Torvalds dnotify_parent(file->f_dentry, DN_MODIFY); 9201da177e4SLinus Torvalds } 9211da177e4SLinus Torvalds 9221da177e4SLinus Torvalds /* clear setuid/setgid flag after write */ 9231da177e4SLinus Torvalds if (err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) { 9241da177e4SLinus Torvalds struct iattr ia; 9251da177e4SLinus Torvalds ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID; 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds down(&inode->i_sem); 9281da177e4SLinus Torvalds notify_change(dentry, &ia); 9291da177e4SLinus Torvalds up(&inode->i_sem); 9301da177e4SLinus Torvalds } 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds if (err >= 0 && stable) { 9331da177e4SLinus Torvalds static ino_t last_ino; 9341da177e4SLinus Torvalds static dev_t last_dev; 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds /* 9371da177e4SLinus Torvalds * Gathered writes: If another process is currently 9381da177e4SLinus Torvalds * writing to the file, there's a high chance 9391da177e4SLinus Torvalds * this is another nfsd (triggered by a bulk write 9401da177e4SLinus Torvalds * from a client's biod). Rather than syncing the 9411da177e4SLinus Torvalds * file with each write request, we sleep for 10 msec. 9421da177e4SLinus Torvalds * 9431da177e4SLinus Torvalds * I don't know if this roughly approximates 9441da177e4SLinus Torvalds * C. Juszak's idea of gathered writes, but it's a 9451da177e4SLinus Torvalds * nice and simple solution (IMHO), and it seems to 9461da177e4SLinus Torvalds * work:-) 9471da177e4SLinus Torvalds */ 9481da177e4SLinus Torvalds if (EX_WGATHER(exp)) { 9491da177e4SLinus Torvalds if (atomic_read(&inode->i_writecount) > 1 9501da177e4SLinus Torvalds || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 9511da177e4SLinus Torvalds dprintk("nfsd: write defer %d\n", current->pid); 9521da177e4SLinus Torvalds msleep(10); 9531da177e4SLinus Torvalds dprintk("nfsd: write resume %d\n", current->pid); 9541da177e4SLinus Torvalds } 9551da177e4SLinus Torvalds 9561da177e4SLinus Torvalds if (inode->i_state & I_DIRTY) { 9571da177e4SLinus Torvalds dprintk("nfsd: write sync %d\n", current->pid); 9581da177e4SLinus Torvalds nfsd_sync(file); 9591da177e4SLinus Torvalds } 9601da177e4SLinus Torvalds #if 0 9611da177e4SLinus Torvalds wake_up(&inode->i_wait); 9621da177e4SLinus Torvalds #endif 9631da177e4SLinus Torvalds } 9641da177e4SLinus Torvalds last_ino = inode->i_ino; 9651da177e4SLinus Torvalds last_dev = inode->i_sb->s_dev; 9661da177e4SLinus Torvalds } 9671da177e4SLinus Torvalds 9681da177e4SLinus Torvalds dprintk("nfsd: write complete err=%d\n", err); 9691da177e4SLinus Torvalds if (err >= 0) 9701da177e4SLinus Torvalds err = 0; 9711da177e4SLinus Torvalds else 9721da177e4SLinus Torvalds err = nfserrno(err); 9731da177e4SLinus Torvalds out: 9741da177e4SLinus Torvalds return err; 9751da177e4SLinus Torvalds } 9761da177e4SLinus Torvalds 9771da177e4SLinus Torvalds /* 9781da177e4SLinus Torvalds * Read data from a file. count must contain the requested read count 9791da177e4SLinus Torvalds * on entry. On return, *count contains the number of bytes actually read. 9801da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 9811da177e4SLinus Torvalds */ 9821da177e4SLinus Torvalds int 9831da177e4SLinus Torvalds nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 9841da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 9851da177e4SLinus Torvalds unsigned long *count) 9861da177e4SLinus Torvalds { 9871da177e4SLinus Torvalds int err; 9881da177e4SLinus Torvalds 9891da177e4SLinus Torvalds if (file) { 9901da177e4SLinus Torvalds err = nfsd_permission(fhp->fh_export, fhp->fh_dentry, 9911da177e4SLinus Torvalds MAY_READ|MAY_OWNER_OVERRIDE); 9921da177e4SLinus Torvalds if (err) 9931da177e4SLinus Torvalds goto out; 9941da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 9951da177e4SLinus Torvalds } else { 9961da177e4SLinus Torvalds err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file); 9971da177e4SLinus Torvalds if (err) 9981da177e4SLinus Torvalds goto out; 9991da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 10001da177e4SLinus Torvalds nfsd_close(file); 10011da177e4SLinus Torvalds } 10021da177e4SLinus Torvalds out: 10031da177e4SLinus Torvalds return err; 10041da177e4SLinus Torvalds } 10051da177e4SLinus Torvalds 10061da177e4SLinus Torvalds /* 10071da177e4SLinus Torvalds * Write data to a file. 10081da177e4SLinus Torvalds * The stable flag requests synchronous writes. 10091da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10101da177e4SLinus Torvalds */ 10111da177e4SLinus Torvalds int 10121da177e4SLinus Torvalds nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10131da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long cnt, 10141da177e4SLinus Torvalds int *stablep) 10151da177e4SLinus Torvalds { 10161da177e4SLinus Torvalds int err = 0; 10171da177e4SLinus Torvalds 10181da177e4SLinus Torvalds if (file) { 10191da177e4SLinus Torvalds err = nfsd_permission(fhp->fh_export, fhp->fh_dentry, 10201da177e4SLinus Torvalds MAY_WRITE|MAY_OWNER_OVERRIDE); 10211da177e4SLinus Torvalds if (err) 10221da177e4SLinus Torvalds goto out; 10231da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, 10241da177e4SLinus Torvalds stablep); 10251da177e4SLinus Torvalds } else { 10261da177e4SLinus Torvalds err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file); 10271da177e4SLinus Torvalds if (err) 10281da177e4SLinus Torvalds goto out; 10291da177e4SLinus Torvalds 10301da177e4SLinus Torvalds if (cnt) 10311da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, 10321da177e4SLinus Torvalds cnt, stablep); 10331da177e4SLinus Torvalds nfsd_close(file); 10341da177e4SLinus Torvalds } 10351da177e4SLinus Torvalds out: 10361da177e4SLinus Torvalds return err; 10371da177e4SLinus Torvalds } 10381da177e4SLinus Torvalds 10391da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 10401da177e4SLinus Torvalds /* 10411da177e4SLinus Torvalds * Commit all pending writes to stable storage. 10421da177e4SLinus Torvalds * Strictly speaking, we could sync just the indicated file region here, 10431da177e4SLinus Torvalds * but there's currently no way we can ask the VFS to do so. 10441da177e4SLinus Torvalds * 10451da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 10461da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 10471da177e4SLinus Torvalds */ 10481da177e4SLinus Torvalds int 10491da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 10501da177e4SLinus Torvalds loff_t offset, unsigned long count) 10511da177e4SLinus Torvalds { 10521da177e4SLinus Torvalds struct file *file; 10531da177e4SLinus Torvalds int err; 10541da177e4SLinus Torvalds 10551da177e4SLinus Torvalds if ((u64)count > ~(u64)offset) 10561da177e4SLinus Torvalds return nfserr_inval; 10571da177e4SLinus Torvalds 10581da177e4SLinus Torvalds if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0) 10591da177e4SLinus Torvalds return err; 10601da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 10611da177e4SLinus Torvalds if (file->f_op && file->f_op->fsync) { 10621da177e4SLinus Torvalds nfsd_sync(file); 10631da177e4SLinus Torvalds } else { 10641da177e4SLinus Torvalds err = nfserr_notsupp; 10651da177e4SLinus Torvalds } 10661da177e4SLinus Torvalds } 10671da177e4SLinus Torvalds 10681da177e4SLinus Torvalds nfsd_close(file); 10691da177e4SLinus Torvalds return err; 10701da177e4SLinus Torvalds } 10711da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 10721da177e4SLinus Torvalds 10731da177e4SLinus Torvalds /* 10741da177e4SLinus Torvalds * Create a file (regular, directory, device, fifo); UNIX sockets 10751da177e4SLinus Torvalds * not yet implemented. 10761da177e4SLinus Torvalds * If the response fh has been verified, the parent directory should 10771da177e4SLinus Torvalds * already be locked. Note that the parent directory is left locked. 10781da177e4SLinus Torvalds * 10791da177e4SLinus Torvalds * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 10801da177e4SLinus Torvalds */ 10811da177e4SLinus Torvalds int 10821da177e4SLinus Torvalds nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 10831da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 10841da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 10851da177e4SLinus Torvalds { 10861da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 10871da177e4SLinus Torvalds struct inode *dirp; 10881da177e4SLinus Torvalds int err; 10891da177e4SLinus Torvalds 10901da177e4SLinus Torvalds err = nfserr_perm; 10911da177e4SLinus Torvalds if (!flen) 10921da177e4SLinus Torvalds goto out; 10931da177e4SLinus Torvalds err = nfserr_exist; 10941da177e4SLinus Torvalds if (isdotent(fname, flen)) 10951da177e4SLinus Torvalds goto out; 10961da177e4SLinus Torvalds 10971da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); 10981da177e4SLinus Torvalds if (err) 10991da177e4SLinus Torvalds goto out; 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds dentry = fhp->fh_dentry; 11021da177e4SLinus Torvalds dirp = dentry->d_inode; 11031da177e4SLinus Torvalds 11041da177e4SLinus Torvalds err = nfserr_notdir; 11051da177e4SLinus Torvalds if(!dirp->i_op || !dirp->i_op->lookup) 11061da177e4SLinus Torvalds goto out; 11071da177e4SLinus Torvalds /* 11081da177e4SLinus Torvalds * Check whether the response file handle has been verified yet. 11091da177e4SLinus Torvalds * If it has, the parent directory should already be locked. 11101da177e4SLinus Torvalds */ 11111da177e4SLinus Torvalds if (!resfhp->fh_dentry) { 11121da177e4SLinus Torvalds /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ 11131da177e4SLinus Torvalds fh_lock(fhp); 11141da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 11151da177e4SLinus Torvalds err = PTR_ERR(dchild); 11161da177e4SLinus Torvalds if (IS_ERR(dchild)) 11171da177e4SLinus Torvalds goto out_nfserr; 11181da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 11191da177e4SLinus Torvalds if (err) 11201da177e4SLinus Torvalds goto out; 11211da177e4SLinus Torvalds } else { 11221da177e4SLinus Torvalds /* called from nfsd_proc_create */ 11231da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 11241da177e4SLinus Torvalds if (!fhp->fh_locked) { 11251da177e4SLinus Torvalds /* not actually possible */ 11261da177e4SLinus Torvalds printk(KERN_ERR 11271da177e4SLinus Torvalds "nfsd_create: parent %s/%s not locked!\n", 11281da177e4SLinus Torvalds dentry->d_parent->d_name.name, 11291da177e4SLinus Torvalds dentry->d_name.name); 11301da177e4SLinus Torvalds err = -EIO; 11311da177e4SLinus Torvalds goto out; 11321da177e4SLinus Torvalds } 11331da177e4SLinus Torvalds } 11341da177e4SLinus Torvalds /* 11351da177e4SLinus Torvalds * Make sure the child dentry is still negative ... 11361da177e4SLinus Torvalds */ 11371da177e4SLinus Torvalds err = nfserr_exist; 11381da177e4SLinus Torvalds if (dchild->d_inode) { 11391da177e4SLinus Torvalds dprintk("nfsd_create: dentry %s/%s not negative!\n", 11401da177e4SLinus Torvalds dentry->d_name.name, dchild->d_name.name); 11411da177e4SLinus Torvalds goto out; 11421da177e4SLinus Torvalds } 11431da177e4SLinus Torvalds 11441da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 11451da177e4SLinus Torvalds iap->ia_mode = 0; 11461da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 11471da177e4SLinus Torvalds 11481da177e4SLinus Torvalds /* 11491da177e4SLinus Torvalds * Get the dir op function pointer. 11501da177e4SLinus Torvalds */ 11511da177e4SLinus Torvalds err = nfserr_perm; 11521da177e4SLinus Torvalds switch (type) { 11531da177e4SLinus Torvalds case S_IFREG: 11541da177e4SLinus Torvalds err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 11551da177e4SLinus Torvalds break; 11561da177e4SLinus Torvalds case S_IFDIR: 11571da177e4SLinus Torvalds err = vfs_mkdir(dirp, dchild, iap->ia_mode); 11581da177e4SLinus Torvalds break; 11591da177e4SLinus Torvalds case S_IFCHR: 11601da177e4SLinus Torvalds case S_IFBLK: 11611da177e4SLinus Torvalds case S_IFIFO: 11621da177e4SLinus Torvalds case S_IFSOCK: 11631da177e4SLinus Torvalds err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 11641da177e4SLinus Torvalds break; 11651da177e4SLinus Torvalds default: 11661da177e4SLinus Torvalds printk("nfsd: bad file type %o in nfsd_create\n", type); 11671da177e4SLinus Torvalds err = -EINVAL; 11681da177e4SLinus Torvalds } 11691da177e4SLinus Torvalds if (err < 0) 11701da177e4SLinus Torvalds goto out_nfserr; 11711da177e4SLinus Torvalds 11721da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 11731da177e4SLinus Torvalds nfsd_sync_dir(dentry); 11741da177e4SLinus Torvalds write_inode_now(dchild->d_inode, 1); 11751da177e4SLinus Torvalds } 11761da177e4SLinus Torvalds 11771da177e4SLinus Torvalds 11781da177e4SLinus Torvalds /* Set file attributes. Mode has already been set and 11791da177e4SLinus Torvalds * setting uid/gid works only for root. Irix appears to 11801da177e4SLinus Torvalds * send along the gid when it tries to implement setgid 11811da177e4SLinus Torvalds * directories via NFS. 11821da177e4SLinus Torvalds */ 11831da177e4SLinus Torvalds err = 0; 11841da177e4SLinus Torvalds if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) 11851da177e4SLinus Torvalds err = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 11861da177e4SLinus Torvalds /* 11871da177e4SLinus Torvalds * Update the file handle to get the new inode info. 11881da177e4SLinus Torvalds */ 11891da177e4SLinus Torvalds if (!err) 11901da177e4SLinus Torvalds err = fh_update(resfhp); 11911da177e4SLinus Torvalds out: 11921da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 11931da177e4SLinus Torvalds dput(dchild); 11941da177e4SLinus Torvalds return err; 11951da177e4SLinus Torvalds 11961da177e4SLinus Torvalds out_nfserr: 11971da177e4SLinus Torvalds err = nfserrno(err); 11981da177e4SLinus Torvalds goto out; 11991da177e4SLinus Torvalds } 12001da177e4SLinus Torvalds 12011da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 12021da177e4SLinus Torvalds /* 12031da177e4SLinus Torvalds * NFSv3 version of nfsd_create 12041da177e4SLinus Torvalds */ 12051da177e4SLinus Torvalds int 12061da177e4SLinus Torvalds nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, 12071da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 12081da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 12091da177e4SLinus Torvalds int *truncp) 12101da177e4SLinus Torvalds { 12111da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 12121da177e4SLinus Torvalds struct inode *dirp; 12131da177e4SLinus Torvalds int err; 12141da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 12151da177e4SLinus Torvalds int v_mode=0; 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds err = nfserr_perm; 12181da177e4SLinus Torvalds if (!flen) 12191da177e4SLinus Torvalds goto out; 12201da177e4SLinus Torvalds err = nfserr_exist; 12211da177e4SLinus Torvalds if (isdotent(fname, flen)) 12221da177e4SLinus Torvalds goto out; 12231da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 12241da177e4SLinus Torvalds iap->ia_mode = 0; 12251da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); 12261da177e4SLinus Torvalds if (err) 12271da177e4SLinus Torvalds goto out; 12281da177e4SLinus Torvalds 12291da177e4SLinus Torvalds dentry = fhp->fh_dentry; 12301da177e4SLinus Torvalds dirp = dentry->d_inode; 12311da177e4SLinus Torvalds 12321da177e4SLinus Torvalds /* Get all the sanity checks out of the way before 12331da177e4SLinus Torvalds * we lock the parent. */ 12341da177e4SLinus Torvalds err = nfserr_notdir; 12351da177e4SLinus Torvalds if(!dirp->i_op || !dirp->i_op->lookup) 12361da177e4SLinus Torvalds goto out; 12371da177e4SLinus Torvalds fh_lock(fhp); 12381da177e4SLinus Torvalds 12391da177e4SLinus Torvalds /* 12401da177e4SLinus Torvalds * Compose the response file handle. 12411da177e4SLinus Torvalds */ 12421da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 12431da177e4SLinus Torvalds err = PTR_ERR(dchild); 12441da177e4SLinus Torvalds if (IS_ERR(dchild)) 12451da177e4SLinus Torvalds goto out_nfserr; 12461da177e4SLinus Torvalds 12471da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 12481da177e4SLinus Torvalds if (err) 12491da177e4SLinus Torvalds goto out; 12501da177e4SLinus Torvalds 12511da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 12521da177e4SLinus Torvalds /* while the verifier would fit in mtime+atime, 12531da177e4SLinus Torvalds * solaris7 gets confused (bugid 4218508) if these have 12541da177e4SLinus Torvalds * the high bit set, so we use the mode as well 12551da177e4SLinus Torvalds */ 12561da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 12571da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 12581da177e4SLinus Torvalds v_mode = S_IFREG 12591da177e4SLinus Torvalds | ((verifier[0]&0x80000000) >> (32-7)) /* u+x */ 12601da177e4SLinus Torvalds | ((verifier[1]&0x80000000) >> (32-9)) /* u+r */ 12611da177e4SLinus Torvalds ; 12621da177e4SLinus Torvalds } 12631da177e4SLinus Torvalds 12641da177e4SLinus Torvalds if (dchild->d_inode) { 12651da177e4SLinus Torvalds err = 0; 12661da177e4SLinus Torvalds 12671da177e4SLinus Torvalds switch (createmode) { 12681da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 12691da177e4SLinus Torvalds if (! S_ISREG(dchild->d_inode->i_mode)) 12701da177e4SLinus Torvalds err = nfserr_exist; 12711da177e4SLinus Torvalds else if (truncp) { 12721da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 12731da177e4SLinus Torvalds * differently. we don't want to truncate the 12741da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 12751da177e4SLinus Torvalds * fails for some other reason. furthermore, 12761da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 12771da177e4SLinus Torvalds * according to spec! 12781da177e4SLinus Torvalds */ 12791da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 12801da177e4SLinus Torvalds } 12811da177e4SLinus Torvalds else { 12821da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 12831da177e4SLinus Torvalds goto set_attr; 12841da177e4SLinus Torvalds } 12851da177e4SLinus Torvalds break; 12861da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 12871da177e4SLinus Torvalds if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 12881da177e4SLinus Torvalds && dchild->d_inode->i_atime.tv_sec == v_atime 12891da177e4SLinus Torvalds && dchild->d_inode->i_mode == v_mode 12901da177e4SLinus Torvalds && dchild->d_inode->i_size == 0 ) 12911da177e4SLinus Torvalds break; 12921da177e4SLinus Torvalds /* fallthru */ 12931da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 12941da177e4SLinus Torvalds err = nfserr_exist; 12951da177e4SLinus Torvalds } 12961da177e4SLinus Torvalds goto out; 12971da177e4SLinus Torvalds } 12981da177e4SLinus Torvalds 12991da177e4SLinus Torvalds err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 13001da177e4SLinus Torvalds if (err < 0) 13011da177e4SLinus Torvalds goto out_nfserr; 13021da177e4SLinus Torvalds 13031da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 13041da177e4SLinus Torvalds nfsd_sync_dir(dentry); 13051da177e4SLinus Torvalds /* setattr will sync the child (or not) */ 13061da177e4SLinus Torvalds } 13071da177e4SLinus Torvalds 13081da177e4SLinus Torvalds /* 13091da177e4SLinus Torvalds * Update the filehandle to get the new inode info. 13101da177e4SLinus Torvalds */ 13111da177e4SLinus Torvalds err = fh_update(resfhp); 13121da177e4SLinus Torvalds if (err) 13131da177e4SLinus Torvalds goto out; 13141da177e4SLinus Torvalds 13151da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 13161da177e4SLinus Torvalds /* Cram the verifier into atime/mtime/mode */ 13171da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 13181da177e4SLinus Torvalds | ATTR_MTIME_SET|ATTR_ATIME_SET 13191da177e4SLinus Torvalds | ATTR_MODE; 13201da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 13211da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 13221da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 13231da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 13241da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 13251da177e4SLinus Torvalds iap->ia_mode = v_mode; 13261da177e4SLinus Torvalds } 13271da177e4SLinus Torvalds 13281da177e4SLinus Torvalds /* Set file attributes. 13291da177e4SLinus Torvalds * Mode has already been set but we might need to reset it 13301da177e4SLinus Torvalds * for CREATE_EXCLUSIVE 13311da177e4SLinus Torvalds * Irix appears to send along the gid when it tries to 13321da177e4SLinus Torvalds * implement setgid directories via NFS. Clear out all that cruft. 13331da177e4SLinus Torvalds */ 13341da177e4SLinus Torvalds set_attr: 13351da177e4SLinus Torvalds if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID)) != 0) 13361da177e4SLinus Torvalds err = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 13371da177e4SLinus Torvalds 13381da177e4SLinus Torvalds out: 13391da177e4SLinus Torvalds fh_unlock(fhp); 13401da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 13411da177e4SLinus Torvalds dput(dchild); 13421da177e4SLinus Torvalds return err; 13431da177e4SLinus Torvalds 13441da177e4SLinus Torvalds out_nfserr: 13451da177e4SLinus Torvalds err = nfserrno(err); 13461da177e4SLinus Torvalds goto out; 13471da177e4SLinus Torvalds } 13481da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 13491da177e4SLinus Torvalds 13501da177e4SLinus Torvalds /* 13511da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 13521da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 13531da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 13541da177e4SLinus Torvalds */ 13551da177e4SLinus Torvalds int 13561da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 13571da177e4SLinus Torvalds { 13581da177e4SLinus Torvalds struct dentry *dentry; 13591da177e4SLinus Torvalds struct inode *inode; 13601da177e4SLinus Torvalds mm_segment_t oldfs; 13611da177e4SLinus Torvalds int err; 13621da177e4SLinus Torvalds 13631da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP); 13641da177e4SLinus Torvalds if (err) 13651da177e4SLinus Torvalds goto out; 13661da177e4SLinus Torvalds 13671da177e4SLinus Torvalds dentry = fhp->fh_dentry; 13681da177e4SLinus Torvalds inode = dentry->d_inode; 13691da177e4SLinus Torvalds 13701da177e4SLinus Torvalds err = nfserr_inval; 13711da177e4SLinus Torvalds if (!inode->i_op || !inode->i_op->readlink) 13721da177e4SLinus Torvalds goto out; 13731da177e4SLinus Torvalds 13741da177e4SLinus Torvalds touch_atime(fhp->fh_export->ex_mnt, dentry); 13751da177e4SLinus Torvalds /* N.B. Why does this call need a get_fs()?? 13761da177e4SLinus Torvalds * Remove the set_fs and watch the fireworks:-) --okir 13771da177e4SLinus Torvalds */ 13781da177e4SLinus Torvalds 13791da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 13801da177e4SLinus Torvalds err = inode->i_op->readlink(dentry, buf, *lenp); 13811da177e4SLinus Torvalds set_fs(oldfs); 13821da177e4SLinus Torvalds 13831da177e4SLinus Torvalds if (err < 0) 13841da177e4SLinus Torvalds goto out_nfserr; 13851da177e4SLinus Torvalds *lenp = err; 13861da177e4SLinus Torvalds err = 0; 13871da177e4SLinus Torvalds out: 13881da177e4SLinus Torvalds return err; 13891da177e4SLinus Torvalds 13901da177e4SLinus Torvalds out_nfserr: 13911da177e4SLinus Torvalds err = nfserrno(err); 13921da177e4SLinus Torvalds goto out; 13931da177e4SLinus Torvalds } 13941da177e4SLinus Torvalds 13951da177e4SLinus Torvalds /* 13961da177e4SLinus Torvalds * Create a symlink and look up its inode 13971da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 13981da177e4SLinus Torvalds */ 13991da177e4SLinus Torvalds int 14001da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 14011da177e4SLinus Torvalds char *fname, int flen, 14021da177e4SLinus Torvalds char *path, int plen, 14031da177e4SLinus Torvalds struct svc_fh *resfhp, 14041da177e4SLinus Torvalds struct iattr *iap) 14051da177e4SLinus Torvalds { 14061da177e4SLinus Torvalds struct dentry *dentry, *dnew; 14071da177e4SLinus Torvalds int err, cerr; 14081da177e4SLinus Torvalds umode_t mode; 14091da177e4SLinus Torvalds 14101da177e4SLinus Torvalds err = nfserr_noent; 14111da177e4SLinus Torvalds if (!flen || !plen) 14121da177e4SLinus Torvalds goto out; 14131da177e4SLinus Torvalds err = nfserr_exist; 14141da177e4SLinus Torvalds if (isdotent(fname, flen)) 14151da177e4SLinus Torvalds goto out; 14161da177e4SLinus Torvalds 14171da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); 14181da177e4SLinus Torvalds if (err) 14191da177e4SLinus Torvalds goto out; 14201da177e4SLinus Torvalds fh_lock(fhp); 14211da177e4SLinus Torvalds dentry = fhp->fh_dentry; 14221da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 14231da177e4SLinus Torvalds err = PTR_ERR(dnew); 14241da177e4SLinus Torvalds if (IS_ERR(dnew)) 14251da177e4SLinus Torvalds goto out_nfserr; 14261da177e4SLinus Torvalds 14271da177e4SLinus Torvalds mode = S_IALLUGO; 14281da177e4SLinus Torvalds /* Only the MODE ATTRibute is even vaguely meaningful */ 14291da177e4SLinus Torvalds if (iap && (iap->ia_valid & ATTR_MODE)) 14301da177e4SLinus Torvalds mode = iap->ia_mode & S_IALLUGO; 14311da177e4SLinus Torvalds 14321da177e4SLinus Torvalds if (unlikely(path[plen] != 0)) { 14331da177e4SLinus Torvalds char *path_alloced = kmalloc(plen+1, GFP_KERNEL); 14341da177e4SLinus Torvalds if (path_alloced == NULL) 14351da177e4SLinus Torvalds err = -ENOMEM; 14361da177e4SLinus Torvalds else { 14371da177e4SLinus Torvalds strncpy(path_alloced, path, plen); 14381da177e4SLinus Torvalds path_alloced[plen] = 0; 14391da177e4SLinus Torvalds err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode); 14401da177e4SLinus Torvalds kfree(path_alloced); 14411da177e4SLinus Torvalds } 14421da177e4SLinus Torvalds } else 14431da177e4SLinus Torvalds err = vfs_symlink(dentry->d_inode, dnew, path, mode); 14441da177e4SLinus Torvalds 14451da177e4SLinus Torvalds if (!err) { 14461da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 14471da177e4SLinus Torvalds nfsd_sync_dir(dentry); 14481da177e4SLinus Torvalds } else 14491da177e4SLinus Torvalds err = nfserrno(err); 14501da177e4SLinus Torvalds fh_unlock(fhp); 14511da177e4SLinus Torvalds 14521da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 14531da177e4SLinus Torvalds dput(dnew); 14541da177e4SLinus Torvalds if (err==0) err = cerr; 14551da177e4SLinus Torvalds out: 14561da177e4SLinus Torvalds return err; 14571da177e4SLinus Torvalds 14581da177e4SLinus Torvalds out_nfserr: 14591da177e4SLinus Torvalds err = nfserrno(err); 14601da177e4SLinus Torvalds goto out; 14611da177e4SLinus Torvalds } 14621da177e4SLinus Torvalds 14631da177e4SLinus Torvalds /* 14641da177e4SLinus Torvalds * Create a hardlink 14651da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 14661da177e4SLinus Torvalds */ 14671da177e4SLinus Torvalds int 14681da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 14691da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 14701da177e4SLinus Torvalds { 14711da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 14721da177e4SLinus Torvalds struct inode *dirp, *dest; 14731da177e4SLinus Torvalds int err; 14741da177e4SLinus Torvalds 14751da177e4SLinus Torvalds err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE); 14761da177e4SLinus Torvalds if (err) 14771da177e4SLinus Torvalds goto out; 14781da177e4SLinus Torvalds err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP); 14791da177e4SLinus Torvalds if (err) 14801da177e4SLinus Torvalds goto out; 14811da177e4SLinus Torvalds 14821da177e4SLinus Torvalds err = nfserr_perm; 14831da177e4SLinus Torvalds if (!len) 14841da177e4SLinus Torvalds goto out; 14851da177e4SLinus Torvalds err = nfserr_exist; 14861da177e4SLinus Torvalds if (isdotent(name, len)) 14871da177e4SLinus Torvalds goto out; 14881da177e4SLinus Torvalds 14891da177e4SLinus Torvalds fh_lock(ffhp); 14901da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 14911da177e4SLinus Torvalds dirp = ddir->d_inode; 14921da177e4SLinus Torvalds 14931da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 14941da177e4SLinus Torvalds err = PTR_ERR(dnew); 14951da177e4SLinus Torvalds if (IS_ERR(dnew)) 14961da177e4SLinus Torvalds goto out_nfserr; 14971da177e4SLinus Torvalds 14981da177e4SLinus Torvalds dold = tfhp->fh_dentry; 14991da177e4SLinus Torvalds dest = dold->d_inode; 15001da177e4SLinus Torvalds 15011da177e4SLinus Torvalds err = vfs_link(dold, dirp, dnew); 15021da177e4SLinus Torvalds if (!err) { 15031da177e4SLinus Torvalds if (EX_ISSYNC(ffhp->fh_export)) { 15041da177e4SLinus Torvalds nfsd_sync_dir(ddir); 15051da177e4SLinus Torvalds write_inode_now(dest, 1); 15061da177e4SLinus Torvalds } 15071da177e4SLinus Torvalds } else { 15081da177e4SLinus Torvalds if (err == -EXDEV && rqstp->rq_vers == 2) 15091da177e4SLinus Torvalds err = nfserr_acces; 15101da177e4SLinus Torvalds else 15111da177e4SLinus Torvalds err = nfserrno(err); 15121da177e4SLinus Torvalds } 15131da177e4SLinus Torvalds 15141da177e4SLinus Torvalds fh_unlock(ffhp); 15151da177e4SLinus Torvalds dput(dnew); 15161da177e4SLinus Torvalds out: 15171da177e4SLinus Torvalds return err; 15181da177e4SLinus Torvalds 15191da177e4SLinus Torvalds out_nfserr: 15201da177e4SLinus Torvalds err = nfserrno(err); 15211da177e4SLinus Torvalds goto out; 15221da177e4SLinus Torvalds } 15231da177e4SLinus Torvalds 15241da177e4SLinus Torvalds /* 15251da177e4SLinus Torvalds * Rename a file 15261da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 15271da177e4SLinus Torvalds */ 15281da177e4SLinus Torvalds int 15291da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 15301da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 15311da177e4SLinus Torvalds { 15321da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 15331da177e4SLinus Torvalds struct inode *fdir, *tdir; 15341da177e4SLinus Torvalds int err; 15351da177e4SLinus Torvalds 15361da177e4SLinus Torvalds err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE); 15371da177e4SLinus Torvalds if (err) 15381da177e4SLinus Torvalds goto out; 15391da177e4SLinus Torvalds err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE); 15401da177e4SLinus Torvalds if (err) 15411da177e4SLinus Torvalds goto out; 15421da177e4SLinus Torvalds 15431da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 15441da177e4SLinus Torvalds fdir = fdentry->d_inode; 15451da177e4SLinus Torvalds 15461da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 15471da177e4SLinus Torvalds tdir = tdentry->d_inode; 15481da177e4SLinus Torvalds 15491da177e4SLinus Torvalds err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; 15501da177e4SLinus Torvalds if (fdir->i_sb != tdir->i_sb) 15511da177e4SLinus Torvalds goto out; 15521da177e4SLinus Torvalds 15531da177e4SLinus Torvalds err = nfserr_perm; 15541da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 15551da177e4SLinus Torvalds goto out; 15561da177e4SLinus Torvalds 15571da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 15581da177e4SLinus Torvalds * so do it by hand */ 15591da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 15601da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 1; 15611da177e4SLinus Torvalds fill_pre_wcc(ffhp); 15621da177e4SLinus Torvalds fill_pre_wcc(tfhp); 15631da177e4SLinus Torvalds 15641da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 15651da177e4SLinus Torvalds err = PTR_ERR(odentry); 15661da177e4SLinus Torvalds if (IS_ERR(odentry)) 15671da177e4SLinus Torvalds goto out_nfserr; 15681da177e4SLinus Torvalds 15691da177e4SLinus Torvalds err = -ENOENT; 15701da177e4SLinus Torvalds if (!odentry->d_inode) 15711da177e4SLinus Torvalds goto out_dput_old; 15721da177e4SLinus Torvalds err = -EINVAL; 15731da177e4SLinus Torvalds if (odentry == trap) 15741da177e4SLinus Torvalds goto out_dput_old; 15751da177e4SLinus Torvalds 15761da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 15771da177e4SLinus Torvalds err = PTR_ERR(ndentry); 15781da177e4SLinus Torvalds if (IS_ERR(ndentry)) 15791da177e4SLinus Torvalds goto out_dput_old; 15801da177e4SLinus Torvalds err = -ENOTEMPTY; 15811da177e4SLinus Torvalds if (ndentry == trap) 15821da177e4SLinus Torvalds goto out_dput_new; 15831da177e4SLinus Torvalds 15841da177e4SLinus Torvalds #ifdef MSNFS 15851da177e4SLinus Torvalds if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) && 15861da177e4SLinus Torvalds ((atomic_read(&odentry->d_count) > 1) 15871da177e4SLinus Torvalds || (atomic_read(&ndentry->d_count) > 1))) { 15881da177e4SLinus Torvalds err = nfserr_perm; 15891da177e4SLinus Torvalds } else 15901da177e4SLinus Torvalds #endif 15911da177e4SLinus Torvalds err = vfs_rename(fdir, odentry, tdir, ndentry); 15921da177e4SLinus Torvalds if (!err && EX_ISSYNC(tfhp->fh_export)) { 15931da177e4SLinus Torvalds nfsd_sync_dir(tdentry); 15941da177e4SLinus Torvalds nfsd_sync_dir(fdentry); 15951da177e4SLinus Torvalds } 15961da177e4SLinus Torvalds 15971da177e4SLinus Torvalds out_dput_new: 15981da177e4SLinus Torvalds dput(ndentry); 15991da177e4SLinus Torvalds out_dput_old: 16001da177e4SLinus Torvalds dput(odentry); 16011da177e4SLinus Torvalds out_nfserr: 16021da177e4SLinus Torvalds if (err) 16031da177e4SLinus Torvalds err = nfserrno(err); 16041da177e4SLinus Torvalds 16051da177e4SLinus Torvalds /* we cannot reply on fh_unlock on the two filehandles, 16061da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 16071da177e4SLinus Torvalds * were the same, so again we do it by hand 16081da177e4SLinus Torvalds */ 16091da177e4SLinus Torvalds fill_post_wcc(ffhp); 16101da177e4SLinus Torvalds fill_post_wcc(tfhp); 16111da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 16121da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 0; 16131da177e4SLinus Torvalds 16141da177e4SLinus Torvalds out: 16151da177e4SLinus Torvalds return err; 16161da177e4SLinus Torvalds } 16171da177e4SLinus Torvalds 16181da177e4SLinus Torvalds /* 16191da177e4SLinus Torvalds * Unlink a file or directory 16201da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 16211da177e4SLinus Torvalds */ 16221da177e4SLinus Torvalds int 16231da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 16241da177e4SLinus Torvalds char *fname, int flen) 16251da177e4SLinus Torvalds { 16261da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 16271da177e4SLinus Torvalds struct inode *dirp; 16281da177e4SLinus Torvalds int err; 16291da177e4SLinus Torvalds 16301da177e4SLinus Torvalds err = nfserr_acces; 16311da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 16321da177e4SLinus Torvalds goto out; 16331da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE); 16341da177e4SLinus Torvalds if (err) 16351da177e4SLinus Torvalds goto out; 16361da177e4SLinus Torvalds 16371da177e4SLinus Torvalds fh_lock(fhp); 16381da177e4SLinus Torvalds dentry = fhp->fh_dentry; 16391da177e4SLinus Torvalds dirp = dentry->d_inode; 16401da177e4SLinus Torvalds 16411da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 16421da177e4SLinus Torvalds err = PTR_ERR(rdentry); 16431da177e4SLinus Torvalds if (IS_ERR(rdentry)) 16441da177e4SLinus Torvalds goto out_nfserr; 16451da177e4SLinus Torvalds 16461da177e4SLinus Torvalds if (!rdentry->d_inode) { 16471da177e4SLinus Torvalds dput(rdentry); 16481da177e4SLinus Torvalds err = nfserr_noent; 16491da177e4SLinus Torvalds goto out; 16501da177e4SLinus Torvalds } 16511da177e4SLinus Torvalds 16521da177e4SLinus Torvalds if (!type) 16531da177e4SLinus Torvalds type = rdentry->d_inode->i_mode & S_IFMT; 16541da177e4SLinus Torvalds 16551da177e4SLinus Torvalds if (type != S_IFDIR) { /* It's UNLINK */ 16561da177e4SLinus Torvalds #ifdef MSNFS 16571da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 16581da177e4SLinus Torvalds (atomic_read(&rdentry->d_count) > 1)) { 16591da177e4SLinus Torvalds err = nfserr_perm; 16601da177e4SLinus Torvalds } else 16611da177e4SLinus Torvalds #endif 16621da177e4SLinus Torvalds err = vfs_unlink(dirp, rdentry); 16631da177e4SLinus Torvalds } else { /* It's RMDIR */ 16641da177e4SLinus Torvalds err = vfs_rmdir(dirp, rdentry); 16651da177e4SLinus Torvalds } 16661da177e4SLinus Torvalds 16671da177e4SLinus Torvalds dput(rdentry); 16681da177e4SLinus Torvalds 16691da177e4SLinus Torvalds if (err) 16701da177e4SLinus Torvalds goto out_nfserr; 16711da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 16721da177e4SLinus Torvalds nfsd_sync_dir(dentry); 16731da177e4SLinus Torvalds 16741da177e4SLinus Torvalds out: 16751da177e4SLinus Torvalds return err; 16761da177e4SLinus Torvalds 16771da177e4SLinus Torvalds out_nfserr: 16781da177e4SLinus Torvalds err = nfserrno(err); 16791da177e4SLinus Torvalds goto out; 16801da177e4SLinus Torvalds } 16811da177e4SLinus Torvalds 16821da177e4SLinus Torvalds /* 16831da177e4SLinus Torvalds * Read entries from a directory. 16841da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 16851da177e4SLinus Torvalds */ 16861da177e4SLinus Torvalds int 16871da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 16881da177e4SLinus Torvalds struct readdir_cd *cdp, encode_dent_fn func) 16891da177e4SLinus Torvalds { 16901da177e4SLinus Torvalds int err; 16911da177e4SLinus Torvalds struct file *file; 16921da177e4SLinus Torvalds loff_t offset = *offsetp; 16931da177e4SLinus Torvalds 16941da177e4SLinus Torvalds err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file); 16951da177e4SLinus Torvalds if (err) 16961da177e4SLinus Torvalds goto out; 16971da177e4SLinus Torvalds 16981da177e4SLinus Torvalds offset = vfs_llseek(file, offset, 0); 16991da177e4SLinus Torvalds if (offset < 0) { 17001da177e4SLinus Torvalds err = nfserrno((int)offset); 17011da177e4SLinus Torvalds goto out_close; 17021da177e4SLinus Torvalds } 17031da177e4SLinus Torvalds 17041da177e4SLinus Torvalds /* 17051da177e4SLinus Torvalds * Read the directory entries. This silly loop is necessary because 17061da177e4SLinus Torvalds * readdir() is not guaranteed to fill up the entire buffer, but 17071da177e4SLinus Torvalds * may choose to do less. 17081da177e4SLinus Torvalds */ 17091da177e4SLinus Torvalds 17101da177e4SLinus Torvalds do { 17111da177e4SLinus Torvalds cdp->err = nfserr_eof; /* will be cleared on successful read */ 17121da177e4SLinus Torvalds err = vfs_readdir(file, (filldir_t) func, cdp); 17131da177e4SLinus Torvalds } while (err >=0 && cdp->err == nfs_ok); 17141da177e4SLinus Torvalds if (err) 17151da177e4SLinus Torvalds err = nfserrno(err); 17161da177e4SLinus Torvalds else 17171da177e4SLinus Torvalds err = cdp->err; 17181da177e4SLinus Torvalds *offsetp = vfs_llseek(file, 0, 1); 17191da177e4SLinus Torvalds 17201da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 17211da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 17221da177e4SLinus Torvalds out_close: 17231da177e4SLinus Torvalds nfsd_close(file); 17241da177e4SLinus Torvalds out: 17251da177e4SLinus Torvalds return err; 17261da177e4SLinus Torvalds } 17271da177e4SLinus Torvalds 17281da177e4SLinus Torvalds /* 17291da177e4SLinus Torvalds * Get file system stats 17301da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 17311da177e4SLinus Torvalds */ 17321da177e4SLinus Torvalds int 17331da177e4SLinus Torvalds nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat) 17341da177e4SLinus Torvalds { 17351da177e4SLinus Torvalds int err = fh_verify(rqstp, fhp, 0, MAY_NOP); 17361da177e4SLinus Torvalds if (!err && vfs_statfs(fhp->fh_dentry->d_inode->i_sb,stat)) 17371da177e4SLinus Torvalds err = nfserr_io; 17381da177e4SLinus Torvalds return err; 17391da177e4SLinus Torvalds } 17401da177e4SLinus Torvalds 17411da177e4SLinus Torvalds /* 17421da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 17431da177e4SLinus Torvalds */ 17441da177e4SLinus Torvalds int 17451da177e4SLinus Torvalds nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc) 17461da177e4SLinus Torvalds { 17471da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 17481da177e4SLinus Torvalds int err; 17491da177e4SLinus Torvalds 17501da177e4SLinus Torvalds if (acc == MAY_NOP) 17511da177e4SLinus Torvalds return 0; 17521da177e4SLinus Torvalds #if 0 17531da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 17541da177e4SLinus Torvalds acc, 17551da177e4SLinus Torvalds (acc & MAY_READ)? " read" : "", 17561da177e4SLinus Torvalds (acc & MAY_WRITE)? " write" : "", 17571da177e4SLinus Torvalds (acc & MAY_EXEC)? " exec" : "", 17581da177e4SLinus Torvalds (acc & MAY_SATTR)? " sattr" : "", 17591da177e4SLinus Torvalds (acc & MAY_TRUNC)? " trunc" : "", 17601da177e4SLinus Torvalds (acc & MAY_LOCK)? " lock" : "", 17611da177e4SLinus Torvalds (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "", 17621da177e4SLinus Torvalds inode->i_mode, 17631da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 17641da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 17651da177e4SLinus Torvalds IS_RDONLY(inode)? " ro" : ""); 17661da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 17671da177e4SLinus Torvalds inode->i_uid, inode->i_gid, current->fsuid, current->fsgid); 17681da177e4SLinus Torvalds #endif 17691da177e4SLinus Torvalds 17701da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 17711da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 17721da177e4SLinus Torvalds * device special file, we ignore rofs. 17731da177e4SLinus Torvalds */ 17741da177e4SLinus Torvalds if (!(acc & MAY_LOCAL_ACCESS)) 17751da177e4SLinus Torvalds if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) { 17761da177e4SLinus Torvalds if (EX_RDONLY(exp) || IS_RDONLY(inode)) 17771da177e4SLinus Torvalds return nfserr_rofs; 17781da177e4SLinus Torvalds if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode)) 17791da177e4SLinus Torvalds return nfserr_perm; 17801da177e4SLinus Torvalds } 17811da177e4SLinus Torvalds if ((acc & MAY_TRUNC) && IS_APPEND(inode)) 17821da177e4SLinus Torvalds return nfserr_perm; 17831da177e4SLinus Torvalds 17841da177e4SLinus Torvalds if (acc & MAY_LOCK) { 17851da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 17861da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 17871da177e4SLinus Torvalds * ownership 17881da177e4SLinus Torvalds */ 17891da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 17901da177e4SLinus Torvalds return 0; 17911da177e4SLinus Torvalds else 17921da177e4SLinus Torvalds acc = MAY_READ | MAY_OWNER_OVERRIDE; 17931da177e4SLinus Torvalds } 17941da177e4SLinus Torvalds /* 17951da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 17961da177e4SLinus Torvalds * would normally be checked at open time. This is to make 17971da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 17981da177e4SLinus Torvalds * 17991da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 18001da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 18011da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 18021da177e4SLinus Torvalds * always implies file truncation. 18031da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 18041da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 18051da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 18061da177e4SLinus Torvalds * with NFSv3. 18071da177e4SLinus Torvalds */ 18081da177e4SLinus Torvalds if ((acc & MAY_OWNER_OVERRIDE) && 18091da177e4SLinus Torvalds inode->i_uid == current->fsuid) 18101da177e4SLinus Torvalds return 0; 18111da177e4SLinus Torvalds 18121da177e4SLinus Torvalds err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL); 18131da177e4SLinus Torvalds 18141da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 18151da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 18161da177e4SLinus Torvalds acc == (MAY_READ | MAY_OWNER_OVERRIDE)) 18171da177e4SLinus Torvalds err = permission(inode, MAY_EXEC, NULL); 18181da177e4SLinus Torvalds 18191da177e4SLinus Torvalds return err? nfserrno(err) : 0; 18201da177e4SLinus Torvalds } 18211da177e4SLinus Torvalds 18221da177e4SLinus Torvalds void 18231da177e4SLinus Torvalds nfsd_racache_shutdown(void) 18241da177e4SLinus Torvalds { 18251da177e4SLinus Torvalds if (!raparm_cache) 18261da177e4SLinus Torvalds return; 18271da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 18281da177e4SLinus Torvalds kfree(raparml); 18291da177e4SLinus Torvalds raparm_cache = raparml = NULL; 18301da177e4SLinus Torvalds } 18311da177e4SLinus Torvalds /* 18321da177e4SLinus Torvalds * Initialize readahead param cache 18331da177e4SLinus Torvalds */ 18341da177e4SLinus Torvalds int 18351da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 18361da177e4SLinus Torvalds { 18371da177e4SLinus Torvalds int i; 18381da177e4SLinus Torvalds 18391da177e4SLinus Torvalds if (raparm_cache) 18401da177e4SLinus Torvalds return 0; 18411da177e4SLinus Torvalds raparml = kmalloc(sizeof(struct raparms) * cache_size, GFP_KERNEL); 18421da177e4SLinus Torvalds 18431da177e4SLinus Torvalds if (raparml != NULL) { 18441da177e4SLinus Torvalds dprintk("nfsd: allocating %d readahead buffers.\n", 18451da177e4SLinus Torvalds cache_size); 18461da177e4SLinus Torvalds memset(raparml, 0, sizeof(struct raparms) * cache_size); 18471da177e4SLinus Torvalds for (i = 0; i < cache_size - 1; i++) { 18481da177e4SLinus Torvalds raparml[i].p_next = raparml + i + 1; 18491da177e4SLinus Torvalds } 18501da177e4SLinus Torvalds raparm_cache = raparml; 18511da177e4SLinus Torvalds } else { 18521da177e4SLinus Torvalds printk(KERN_WARNING 18531da177e4SLinus Torvalds "nfsd: Could not allocate memory read-ahead cache.\n"); 18541da177e4SLinus Torvalds return -ENOMEM; 18551da177e4SLinus Torvalds } 18561da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 18571da177e4SLinus Torvalds return 0; 18581da177e4SLinus Torvalds } 1859a257cdd0SAndreas Gruenbacher 1860a257cdd0SAndreas Gruenbacher #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 1861a257cdd0SAndreas Gruenbacher struct posix_acl * 1862a257cdd0SAndreas Gruenbacher nfsd_get_posix_acl(struct svc_fh *fhp, int type) 1863a257cdd0SAndreas Gruenbacher { 1864a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 1865a257cdd0SAndreas Gruenbacher char *name; 1866a257cdd0SAndreas Gruenbacher void *value = NULL; 1867a257cdd0SAndreas Gruenbacher ssize_t size; 1868a257cdd0SAndreas Gruenbacher struct posix_acl *acl; 1869a257cdd0SAndreas Gruenbacher 1870a257cdd0SAndreas Gruenbacher if (!IS_POSIXACL(inode) || !inode->i_op || !inode->i_op->getxattr) 1871a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 1872a257cdd0SAndreas Gruenbacher switch(type) { 1873a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 1874*334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 1875a257cdd0SAndreas Gruenbacher break; 1876a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 1877*334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 1878a257cdd0SAndreas Gruenbacher break; 1879a257cdd0SAndreas Gruenbacher default: 1880a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 1881a257cdd0SAndreas Gruenbacher } 1882a257cdd0SAndreas Gruenbacher 1883a257cdd0SAndreas Gruenbacher size = inode->i_op->getxattr(fhp->fh_dentry, name, NULL, 0); 1884a257cdd0SAndreas Gruenbacher 1885a257cdd0SAndreas Gruenbacher if (size < 0) { 1886a257cdd0SAndreas Gruenbacher acl = ERR_PTR(size); 1887a257cdd0SAndreas Gruenbacher goto getout; 1888a257cdd0SAndreas Gruenbacher } else if (size > 0) { 1889a257cdd0SAndreas Gruenbacher value = kmalloc(size, GFP_KERNEL); 1890a257cdd0SAndreas Gruenbacher if (!value) { 1891a257cdd0SAndreas Gruenbacher acl = ERR_PTR(-ENOMEM); 1892a257cdd0SAndreas Gruenbacher goto getout; 1893a257cdd0SAndreas Gruenbacher } 1894a257cdd0SAndreas Gruenbacher size = inode->i_op->getxattr(fhp->fh_dentry, name, value, size); 1895a257cdd0SAndreas Gruenbacher if (size < 0) { 1896a257cdd0SAndreas Gruenbacher acl = ERR_PTR(size); 1897a257cdd0SAndreas Gruenbacher goto getout; 1898a257cdd0SAndreas Gruenbacher } 1899a257cdd0SAndreas Gruenbacher } 1900a257cdd0SAndreas Gruenbacher acl = posix_acl_from_xattr(value, size); 1901a257cdd0SAndreas Gruenbacher 1902a257cdd0SAndreas Gruenbacher getout: 1903a257cdd0SAndreas Gruenbacher kfree(value); 1904a257cdd0SAndreas Gruenbacher return acl; 1905a257cdd0SAndreas Gruenbacher } 1906a257cdd0SAndreas Gruenbacher 1907a257cdd0SAndreas Gruenbacher int 1908a257cdd0SAndreas Gruenbacher nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) 1909a257cdd0SAndreas Gruenbacher { 1910a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 1911a257cdd0SAndreas Gruenbacher char *name; 1912a257cdd0SAndreas Gruenbacher void *value = NULL; 1913a257cdd0SAndreas Gruenbacher size_t size; 1914a257cdd0SAndreas Gruenbacher int error; 1915a257cdd0SAndreas Gruenbacher 1916a257cdd0SAndreas Gruenbacher if (!IS_POSIXACL(inode) || !inode->i_op || 1917a257cdd0SAndreas Gruenbacher !inode->i_op->setxattr || !inode->i_op->removexattr) 1918a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 1919a257cdd0SAndreas Gruenbacher switch(type) { 1920a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 1921*334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 1922a257cdd0SAndreas Gruenbacher break; 1923a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 1924*334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 1925a257cdd0SAndreas Gruenbacher break; 1926a257cdd0SAndreas Gruenbacher default: 1927a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 1928a257cdd0SAndreas Gruenbacher } 1929a257cdd0SAndreas Gruenbacher 1930a257cdd0SAndreas Gruenbacher if (acl && acl->a_count) { 1931*334a13ecSChristoph Hellwig size = posix_acl_xattr_size(acl->a_count); 1932a257cdd0SAndreas Gruenbacher value = kmalloc(size, GFP_KERNEL); 1933a257cdd0SAndreas Gruenbacher if (!value) 1934a257cdd0SAndreas Gruenbacher return -ENOMEM; 1935a257cdd0SAndreas Gruenbacher size = posix_acl_to_xattr(acl, value, size); 1936a257cdd0SAndreas Gruenbacher if (size < 0) { 1937a257cdd0SAndreas Gruenbacher error = size; 1938a257cdd0SAndreas Gruenbacher goto getout; 1939a257cdd0SAndreas Gruenbacher } 1940a257cdd0SAndreas Gruenbacher } else 1941a257cdd0SAndreas Gruenbacher size = 0; 1942a257cdd0SAndreas Gruenbacher 1943a257cdd0SAndreas Gruenbacher if (!fhp->fh_locked) 1944a257cdd0SAndreas Gruenbacher fh_lock(fhp); /* unlocking is done automatically */ 1945a257cdd0SAndreas Gruenbacher if (size) 1946a257cdd0SAndreas Gruenbacher error = inode->i_op->setxattr(fhp->fh_dentry, name, 1947a257cdd0SAndreas Gruenbacher value, size, 0); 1948a257cdd0SAndreas Gruenbacher else { 1949a257cdd0SAndreas Gruenbacher if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) 1950a257cdd0SAndreas Gruenbacher error = 0; 1951a257cdd0SAndreas Gruenbacher else { 1952a257cdd0SAndreas Gruenbacher error = inode->i_op->removexattr(fhp->fh_dentry, name); 1953a257cdd0SAndreas Gruenbacher if (error == -ENODATA) 1954a257cdd0SAndreas Gruenbacher error = 0; 1955a257cdd0SAndreas Gruenbacher } 1956a257cdd0SAndreas Gruenbacher } 1957a257cdd0SAndreas Gruenbacher 1958a257cdd0SAndreas Gruenbacher getout: 1959a257cdd0SAndreas Gruenbacher kfree(value); 1960a257cdd0SAndreas Gruenbacher return error; 1961a257cdd0SAndreas Gruenbacher } 1962a257cdd0SAndreas Gruenbacher #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ 1963