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> 480eeca283SRobert Love #include <linux/fsnotify.h> 491da177e4SLinus Torvalds #include <linux/posix_acl.h> 501da177e4SLinus Torvalds #include <linux/posix_acl_xattr.h> 511da177e4SLinus Torvalds #include <linux/xattr.h> 525be196e5SChristoph Hellwig #ifdef CONFIG_NFSD_V4 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); 25715b7a1b8SNeilBrown if (err) 2581da177e4SLinus Torvalds goto out; 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds dentry = fhp->fh_dentry; 2611da177e4SLinus Torvalds inode = dentry->d_inode; 2621da177e4SLinus Torvalds 26315b7a1b8SNeilBrown /* Ignore any mode updates on symlinks */ 26415b7a1b8SNeilBrown if (S_ISLNK(inode->i_mode)) 26515b7a1b8SNeilBrown iap->ia_valid &= ~ATTR_MODE; 26615b7a1b8SNeilBrown 26715b7a1b8SNeilBrown if (!iap->ia_valid) 26815b7a1b8SNeilBrown goto out; 26915b7a1b8SNeilBrown 2701da177e4SLinus Torvalds /* NFSv2 does not differentiate between "set-[ac]time-to-now" 2711da177e4SLinus Torvalds * which only requires access, and "set-[ac]time-to-X" which 2721da177e4SLinus Torvalds * requires ownership. 2731da177e4SLinus Torvalds * So if it looks like it might be "set both to the same time which 2741da177e4SLinus Torvalds * is close to now", and if inode_change_ok fails, then we 2751da177e4SLinus Torvalds * convert to "set to now" instead of "set to explicit time" 2761da177e4SLinus Torvalds * 2771da177e4SLinus Torvalds * We only call inode_change_ok as the last test as technically 2781da177e4SLinus Torvalds * it is not an interface that we should be using. It is only 2791da177e4SLinus Torvalds * valid if the filesystem does not define it's own i_op->setattr. 2801da177e4SLinus Torvalds */ 2811da177e4SLinus Torvalds #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) 2821da177e4SLinus Torvalds #define MAX_TOUCH_TIME_ERROR (30*60) 2831da177e4SLinus Torvalds if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET 2841da177e4SLinus Torvalds && iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec 2851da177e4SLinus Torvalds ) { 2861da177e4SLinus Torvalds /* Looks probable. Now just make sure time is in the right ballpark. 2871da177e4SLinus Torvalds * Solaris, at least, doesn't seem to care what the time request is. 2881da177e4SLinus Torvalds * We require it be within 30 minutes of now. 2891da177e4SLinus Torvalds */ 2901da177e4SLinus Torvalds time_t delta = iap->ia_atime.tv_sec - get_seconds(); 2911da177e4SLinus Torvalds if (delta<0) delta = -delta; 2921da177e4SLinus Torvalds if (delta < MAX_TOUCH_TIME_ERROR && 2931da177e4SLinus Torvalds inode_change_ok(inode, iap) != 0) { 2941da177e4SLinus Torvalds /* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME 2951da177e4SLinus Torvalds * this will cause notify_change to set these times to "now" 2961da177e4SLinus Torvalds */ 2971da177e4SLinus Torvalds iap->ia_valid &= ~BOTH_TIME_SET; 2981da177e4SLinus Torvalds } 2991da177e4SLinus Torvalds } 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds /* The size case is special. It changes the file as well as the attributes. */ 3021da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) { 3031da177e4SLinus Torvalds if (iap->ia_size < inode->i_size) { 3041da177e4SLinus Torvalds err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE); 3051da177e4SLinus Torvalds if (err) 3061da177e4SLinus Torvalds goto out; 3071da177e4SLinus Torvalds } 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds /* 3101da177e4SLinus Torvalds * If we are changing the size of the file, then 3111da177e4SLinus Torvalds * we need to break all leases. 3121da177e4SLinus Torvalds */ 3131da177e4SLinus Torvalds err = break_lease(inode, FMODE_WRITE | O_NONBLOCK); 3141da177e4SLinus Torvalds if (err == -EWOULDBLOCK) 3151da177e4SLinus Torvalds err = -ETIMEDOUT; 3161da177e4SLinus Torvalds if (err) /* ENOMEM or EWOULDBLOCK */ 3171da177e4SLinus Torvalds goto out_nfserr; 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds err = get_write_access(inode); 3201da177e4SLinus Torvalds if (err) 3211da177e4SLinus Torvalds goto out_nfserr; 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds size_change = 1; 3241da177e4SLinus Torvalds err = locks_verify_truncate(inode, NULL, iap->ia_size); 3251da177e4SLinus Torvalds if (err) { 3261da177e4SLinus Torvalds put_write_access(inode); 3271da177e4SLinus Torvalds goto out_nfserr; 3281da177e4SLinus Torvalds } 3291da177e4SLinus Torvalds DQUOT_INIT(inode); 3301da177e4SLinus Torvalds } 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds imode = inode->i_mode; 3331da177e4SLinus Torvalds if (iap->ia_valid & ATTR_MODE) { 3341da177e4SLinus Torvalds iap->ia_mode &= S_IALLUGO; 3351da177e4SLinus Torvalds imode = iap->ia_mode |= (imode & ~S_IALLUGO); 3361da177e4SLinus Torvalds } 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds /* Revoke setuid/setgid bit on chown/chgrp */ 3391da177e4SLinus Torvalds if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) 3401da177e4SLinus Torvalds iap->ia_valid |= ATTR_KILL_SUID; 3411da177e4SLinus Torvalds if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid) 3421da177e4SLinus Torvalds iap->ia_valid |= ATTR_KILL_SGID; 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds /* Change the attributes. */ 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds err = nfserr_notsync; 3491da177e4SLinus Torvalds if (!check_guard || guardtime == inode->i_ctime.tv_sec) { 3501da177e4SLinus Torvalds fh_lock(fhp); 3511da177e4SLinus Torvalds err = notify_change(dentry, iap); 3521da177e4SLinus Torvalds err = nfserrno(err); 3531da177e4SLinus Torvalds fh_unlock(fhp); 3541da177e4SLinus Torvalds } 3551da177e4SLinus Torvalds if (size_change) 3561da177e4SLinus Torvalds put_write_access(inode); 3571da177e4SLinus Torvalds if (!err) 3581da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 3591da177e4SLinus Torvalds write_inode_now(inode, 1); 3601da177e4SLinus Torvalds out: 3611da177e4SLinus Torvalds return err; 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds out_nfserr: 3641da177e4SLinus Torvalds err = nfserrno(err); 3651da177e4SLinus Torvalds goto out; 3661da177e4SLinus Torvalds } 3671da177e4SLinus Torvalds 3685be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V2_ACL) || \ 3695be196e5SChristoph Hellwig defined(CONFIG_NFSD_V3_ACL) || \ 3705be196e5SChristoph Hellwig defined(CONFIG_NFSD_V4) 3715be196e5SChristoph Hellwig static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) 3725be196e5SChristoph Hellwig { 3735be196e5SChristoph Hellwig ssize_t buflen; 3745be196e5SChristoph Hellwig int error; 3751da177e4SLinus Torvalds 3765be196e5SChristoph Hellwig buflen = vfs_getxattr(dentry, key, NULL, 0); 3775be196e5SChristoph Hellwig if (buflen <= 0) 3785be196e5SChristoph Hellwig return buflen; 3795be196e5SChristoph Hellwig 3805be196e5SChristoph Hellwig *buf = kmalloc(buflen, GFP_KERNEL); 3815be196e5SChristoph Hellwig if (!*buf) 3825be196e5SChristoph Hellwig return -ENOMEM; 3835be196e5SChristoph Hellwig 3845be196e5SChristoph Hellwig error = vfs_getxattr(dentry, key, *buf, buflen); 3855be196e5SChristoph Hellwig if (error < 0) 3865be196e5SChristoph Hellwig return error; 3875be196e5SChristoph Hellwig return buflen; 3885be196e5SChristoph Hellwig } 3895be196e5SChristoph Hellwig #endif 3905be196e5SChristoph Hellwig 3915be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V4) 3921da177e4SLinus Torvalds static int 3931da177e4SLinus Torvalds set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) 3941da177e4SLinus Torvalds { 3951da177e4SLinus Torvalds int len; 3961da177e4SLinus Torvalds size_t buflen; 3971da177e4SLinus Torvalds char *buf = NULL; 3981da177e4SLinus Torvalds int error = 0; 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds buflen = posix_acl_xattr_size(pacl->a_count); 4011da177e4SLinus Torvalds buf = kmalloc(buflen, GFP_KERNEL); 4021da177e4SLinus Torvalds error = -ENOMEM; 4031da177e4SLinus Torvalds if (buf == NULL) 4041da177e4SLinus Torvalds goto out; 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds len = posix_acl_to_xattr(pacl, buf, buflen); 4071da177e4SLinus Torvalds if (len < 0) { 4081da177e4SLinus Torvalds error = len; 4091da177e4SLinus Torvalds goto out; 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds 4125be196e5SChristoph Hellwig error = vfs_setxattr(dentry, key, buf, len, 0); 4131da177e4SLinus Torvalds out: 4141da177e4SLinus Torvalds kfree(buf); 4151da177e4SLinus Torvalds return error; 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds int 4191da177e4SLinus Torvalds nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, 4201da177e4SLinus Torvalds struct nfs4_acl *acl) 4211da177e4SLinus Torvalds { 4221da177e4SLinus Torvalds int error; 4231da177e4SLinus Torvalds struct dentry *dentry; 4241da177e4SLinus Torvalds struct inode *inode; 4251da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 4261da177e4SLinus Torvalds unsigned int flags = 0; 4271da177e4SLinus Torvalds 4281da177e4SLinus Torvalds /* Get inode */ 4291da177e4SLinus Torvalds error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR); 4301da177e4SLinus Torvalds if (error) 4311da177e4SLinus Torvalds goto out; 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds dentry = fhp->fh_dentry; 4341da177e4SLinus Torvalds inode = dentry->d_inode; 4351da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) 4361da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); 4391da177e4SLinus Torvalds if (error == -EINVAL) { 4401da177e4SLinus Torvalds error = nfserr_attrnotsupp; 4411da177e4SLinus Torvalds goto out; 4421da177e4SLinus Torvalds } else if (error < 0) 4431da177e4SLinus Torvalds goto out_nfserr; 4441da177e4SLinus Torvalds 4451da177e4SLinus Torvalds if (pacl) { 4469a59f452SChristoph Hellwig error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); 4471da177e4SLinus Torvalds if (error < 0) 4481da177e4SLinus Torvalds goto out_nfserr; 4491da177e4SLinus Torvalds } 4501da177e4SLinus Torvalds 4511da177e4SLinus Torvalds if (dpacl) { 4529a59f452SChristoph Hellwig error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); 4531da177e4SLinus Torvalds if (error < 0) 4541da177e4SLinus Torvalds goto out_nfserr; 4551da177e4SLinus Torvalds } 4561da177e4SLinus Torvalds 4571da177e4SLinus Torvalds error = nfs_ok; 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds out: 4601da177e4SLinus Torvalds posix_acl_release(pacl); 4611da177e4SLinus Torvalds posix_acl_release(dpacl); 4621da177e4SLinus Torvalds return (error); 4631da177e4SLinus Torvalds out_nfserr: 4641da177e4SLinus Torvalds error = nfserrno(error); 4651da177e4SLinus Torvalds goto out; 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds 4681da177e4SLinus Torvalds static struct posix_acl * 4691da177e4SLinus Torvalds _get_posix_acl(struct dentry *dentry, char *key) 4701da177e4SLinus Torvalds { 4715be196e5SChristoph Hellwig void *buf = NULL; 4721da177e4SLinus Torvalds struct posix_acl *pacl = NULL; 4735be196e5SChristoph Hellwig int buflen; 4741da177e4SLinus Torvalds 4755be196e5SChristoph Hellwig buflen = nfsd_getxattr(dentry, key, &buf); 4765be196e5SChristoph Hellwig if (!buflen) 4775be196e5SChristoph Hellwig buflen = -ENODATA; 4785be196e5SChristoph Hellwig if (buflen <= 0) 4795be196e5SChristoph Hellwig return ERR_PTR(buflen); 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds pacl = posix_acl_from_xattr(buf, buflen); 4821da177e4SLinus Torvalds kfree(buf); 4831da177e4SLinus Torvalds return pacl; 4841da177e4SLinus Torvalds } 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds int 4871da177e4SLinus Torvalds nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) 4881da177e4SLinus Torvalds { 4891da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 4901da177e4SLinus Torvalds int error = 0; 4911da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 4921da177e4SLinus Torvalds unsigned int flags = 0; 4931da177e4SLinus Torvalds 4949a59f452SChristoph Hellwig pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); 4951da177e4SLinus Torvalds if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) 4961da177e4SLinus Torvalds pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 4971da177e4SLinus Torvalds if (IS_ERR(pacl)) { 4981da177e4SLinus Torvalds error = PTR_ERR(pacl); 4991da177e4SLinus Torvalds pacl = NULL; 5001da177e4SLinus Torvalds goto out; 5011da177e4SLinus Torvalds } 5021da177e4SLinus Torvalds 5031da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) { 5049a59f452SChristoph Hellwig dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); 5051da177e4SLinus Torvalds if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) 5061da177e4SLinus Torvalds dpacl = NULL; 5071da177e4SLinus Torvalds else if (IS_ERR(dpacl)) { 5081da177e4SLinus Torvalds error = PTR_ERR(dpacl); 5091da177e4SLinus Torvalds dpacl = NULL; 5101da177e4SLinus Torvalds goto out; 5111da177e4SLinus Torvalds } 5121da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5131da177e4SLinus Torvalds } 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); 5161da177e4SLinus Torvalds if (IS_ERR(*acl)) { 5171da177e4SLinus Torvalds error = PTR_ERR(*acl); 5181da177e4SLinus Torvalds *acl = NULL; 5191da177e4SLinus Torvalds } 5201da177e4SLinus Torvalds out: 5211da177e4SLinus Torvalds posix_acl_release(pacl); 5221da177e4SLinus Torvalds posix_acl_release(dpacl); 5231da177e4SLinus Torvalds return error; 5241da177e4SLinus Torvalds } 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds #endif /* defined(CONFIG_NFS_V4) */ 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 5291da177e4SLinus Torvalds /* 5301da177e4SLinus Torvalds * Check server access rights to a file system object 5311da177e4SLinus Torvalds */ 5321da177e4SLinus Torvalds struct accessmap { 5331da177e4SLinus Torvalds u32 access; 5341da177e4SLinus Torvalds int how; 5351da177e4SLinus Torvalds }; 5361da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 5371da177e4SLinus Torvalds { NFS3_ACCESS_READ, MAY_READ }, 5381da177e4SLinus Torvalds { NFS3_ACCESS_EXECUTE, MAY_EXEC }, 5391da177e4SLinus Torvalds { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_TRUNC }, 5401da177e4SLinus Torvalds { NFS3_ACCESS_EXTEND, MAY_WRITE }, 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds { 0, 0 } 5431da177e4SLinus Torvalds }; 5441da177e4SLinus Torvalds 5451da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 5461da177e4SLinus Torvalds { NFS3_ACCESS_READ, MAY_READ }, 5471da177e4SLinus Torvalds { NFS3_ACCESS_LOOKUP, MAY_EXEC }, 5481da177e4SLinus Torvalds { NFS3_ACCESS_MODIFY, MAY_EXEC|MAY_WRITE|MAY_TRUNC }, 5491da177e4SLinus Torvalds { NFS3_ACCESS_EXTEND, MAY_EXEC|MAY_WRITE }, 5501da177e4SLinus Torvalds { NFS3_ACCESS_DELETE, MAY_REMOVE }, 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds { 0, 0 } 5531da177e4SLinus Torvalds }; 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 5561da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 5571da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 5581da177e4SLinus Torvalds * (which really, the server doesn't care about). So 5591da177e4SLinus Torvalds * We provide simple access checking for them, looking 5601da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 5611da177e4SLinus Torvalds * filesystem checks 5621da177e4SLinus Torvalds */ 5631da177e4SLinus Torvalds { NFS3_ACCESS_READ, MAY_READ }, 5641da177e4SLinus Torvalds { NFS3_ACCESS_EXECUTE, MAY_EXEC }, 5651da177e4SLinus Torvalds { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_LOCAL_ACCESS }, 5661da177e4SLinus Torvalds { NFS3_ACCESS_EXTEND, MAY_WRITE|MAY_LOCAL_ACCESS }, 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds { 0, 0 } 5691da177e4SLinus Torvalds }; 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds int 5721da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 5731da177e4SLinus Torvalds { 5741da177e4SLinus Torvalds struct accessmap *map; 5751da177e4SLinus Torvalds struct svc_export *export; 5761da177e4SLinus Torvalds struct dentry *dentry; 5771da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 5781da177e4SLinus Torvalds unsigned int error; 5791da177e4SLinus Torvalds 5801da177e4SLinus Torvalds error = fh_verify(rqstp, fhp, 0, MAY_NOP); 5811da177e4SLinus Torvalds if (error) 5821da177e4SLinus Torvalds goto out; 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds export = fhp->fh_export; 5851da177e4SLinus Torvalds dentry = fhp->fh_dentry; 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds if (S_ISREG(dentry->d_inode->i_mode)) 5881da177e4SLinus Torvalds map = nfs3_regaccess; 5891da177e4SLinus Torvalds else if (S_ISDIR(dentry->d_inode->i_mode)) 5901da177e4SLinus Torvalds map = nfs3_diraccess; 5911da177e4SLinus Torvalds else 5921da177e4SLinus Torvalds map = nfs3_anyaccess; 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds query = *access; 5961da177e4SLinus Torvalds for (; map->access; map++) { 5971da177e4SLinus Torvalds if (map->access & query) { 5981da177e4SLinus Torvalds unsigned int err2; 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds sresult |= map->access; 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds err2 = nfsd_permission(export, dentry, map->how); 6031da177e4SLinus Torvalds switch (err2) { 6041da177e4SLinus Torvalds case nfs_ok: 6051da177e4SLinus Torvalds result |= map->access; 6061da177e4SLinus Torvalds break; 6071da177e4SLinus Torvalds 6081da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 6091da177e4SLinus Torvalds * rather than an error occurred */ 6101da177e4SLinus Torvalds case nfserr_rofs: 6111da177e4SLinus Torvalds case nfserr_acces: 6121da177e4SLinus Torvalds case nfserr_perm: 6131da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 6141da177e4SLinus Torvalds break; 6151da177e4SLinus Torvalds default: 6161da177e4SLinus Torvalds error = err2; 6171da177e4SLinus Torvalds goto out; 6181da177e4SLinus Torvalds } 6191da177e4SLinus Torvalds } 6201da177e4SLinus Torvalds } 6211da177e4SLinus Torvalds *access = result; 6221da177e4SLinus Torvalds if (supported) 6231da177e4SLinus Torvalds *supported = sresult; 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds out: 6261da177e4SLinus Torvalds return error; 6271da177e4SLinus Torvalds } 6281da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 6291da177e4SLinus Torvalds 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds /* 6331da177e4SLinus Torvalds * Open an existing file or directory. 6341da177e4SLinus Torvalds * The access argument indicates the type of open (read/write/lock) 6351da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 6361da177e4SLinus Torvalds */ 6371da177e4SLinus Torvalds int 6381da177e4SLinus Torvalds nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 6391da177e4SLinus Torvalds int access, struct file **filp) 6401da177e4SLinus Torvalds { 6411da177e4SLinus Torvalds struct dentry *dentry; 6421da177e4SLinus Torvalds struct inode *inode; 6431da177e4SLinus Torvalds int flags = O_RDONLY|O_LARGEFILE, err; 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds /* 6461da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 6471da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 6481da177e4SLinus Torvalds * in case a chmod has now revoked permission. 6491da177e4SLinus Torvalds */ 6501da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE); 6511da177e4SLinus Torvalds if (err) 6521da177e4SLinus Torvalds goto out; 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6551da177e4SLinus Torvalds inode = dentry->d_inode; 6561da177e4SLinus Torvalds 6571da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 6581da177e4SLinus Torvalds * or any access when mandatory locking enabled 6591da177e4SLinus Torvalds */ 6601da177e4SLinus Torvalds err = nfserr_perm; 6611da177e4SLinus Torvalds if (IS_APPEND(inode) && (access & MAY_WRITE)) 6621da177e4SLinus Torvalds goto out; 6631da177e4SLinus Torvalds if (IS_ISMNDLK(inode)) 6641da177e4SLinus Torvalds goto out; 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds if (!inode->i_fop) 6671da177e4SLinus Torvalds goto out; 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds /* 6701da177e4SLinus Torvalds * Check to see if there are any leases on this file. 6711da177e4SLinus Torvalds * This may block while leases are broken. 6721da177e4SLinus Torvalds */ 6731da177e4SLinus Torvalds err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0)); 6741da177e4SLinus Torvalds if (err == -EWOULDBLOCK) 6751da177e4SLinus Torvalds err = -ETIMEDOUT; 6761da177e4SLinus Torvalds if (err) /* NOMEM or WOULDBLOCK */ 6771da177e4SLinus Torvalds goto out_nfserr; 6781da177e4SLinus Torvalds 6791da177e4SLinus Torvalds if (access & MAY_WRITE) { 6801da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds DQUOT_INIT(inode); 6831da177e4SLinus Torvalds } 6841da177e4SLinus Torvalds *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags); 6851da177e4SLinus Torvalds if (IS_ERR(*filp)) 6861da177e4SLinus Torvalds err = PTR_ERR(*filp); 6871da177e4SLinus Torvalds out_nfserr: 6881da177e4SLinus Torvalds if (err) 6891da177e4SLinus Torvalds err = nfserrno(err); 6901da177e4SLinus Torvalds out: 6911da177e4SLinus Torvalds return err; 6921da177e4SLinus Torvalds } 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds /* 6951da177e4SLinus Torvalds * Close a file. 6961da177e4SLinus Torvalds */ 6971da177e4SLinus Torvalds void 6981da177e4SLinus Torvalds nfsd_close(struct file *filp) 6991da177e4SLinus Torvalds { 7001da177e4SLinus Torvalds fput(filp); 7011da177e4SLinus Torvalds } 7021da177e4SLinus Torvalds 7031da177e4SLinus Torvalds /* 7041da177e4SLinus Torvalds * Sync a file 7051da177e4SLinus Torvalds * As this calls fsync (not fdatasync) there is no need for a write_inode 7061da177e4SLinus Torvalds * after it. 7071da177e4SLinus Torvalds */ 708a334de28SDavid Shaw static inline int nfsd_dosync(struct file *filp, struct dentry *dp, 7091da177e4SLinus Torvalds struct file_operations *fop) 7101da177e4SLinus Torvalds { 7111da177e4SLinus Torvalds struct inode *inode = dp->d_inode; 7121da177e4SLinus Torvalds int (*fsync) (struct file *, struct dentry *, int); 713f193fbabSYAMAMOTO Takashi int err; 7141da177e4SLinus Torvalds 715f193fbabSYAMAMOTO Takashi err = filemap_fdatawrite(inode->i_mapping); 716f193fbabSYAMAMOTO Takashi if (err == 0 && fop && (fsync = fop->fsync)) 717a334de28SDavid Shaw err = fsync(filp, dp, 0); 718f193fbabSYAMAMOTO Takashi if (err == 0) 719f193fbabSYAMAMOTO Takashi err = filemap_fdatawait(inode->i_mapping); 720a334de28SDavid Shaw 721f193fbabSYAMAMOTO Takashi return err; 7221da177e4SLinus Torvalds } 7231da177e4SLinus Torvalds 7241da177e4SLinus Torvalds 725a334de28SDavid Shaw static int 7261da177e4SLinus Torvalds nfsd_sync(struct file *filp) 7271da177e4SLinus Torvalds { 728a334de28SDavid Shaw int err; 7291da177e4SLinus Torvalds struct inode *inode = filp->f_dentry->d_inode; 7301da177e4SLinus Torvalds dprintk("nfsd: sync file %s\n", filp->f_dentry->d_name.name); 7311b1dcc1bSJes Sorensen mutex_lock(&inode->i_mutex); 732a334de28SDavid Shaw err=nfsd_dosync(filp, filp->f_dentry, filp->f_op); 7331b1dcc1bSJes Sorensen mutex_unlock(&inode->i_mutex); 734a334de28SDavid Shaw 735a334de28SDavid Shaw return err; 7361da177e4SLinus Torvalds } 7371da177e4SLinus Torvalds 738f193fbabSYAMAMOTO Takashi int 7391da177e4SLinus Torvalds nfsd_sync_dir(struct dentry *dp) 7401da177e4SLinus Torvalds { 741f193fbabSYAMAMOTO Takashi return nfsd_dosync(NULL, dp, dp->d_inode->i_fop); 7421da177e4SLinus Torvalds } 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds /* 7451da177e4SLinus Torvalds * Obtain the readahead parameters for the file 7461da177e4SLinus Torvalds * specified by (dev, ino). 7471da177e4SLinus Torvalds */ 7481da177e4SLinus Torvalds static DEFINE_SPINLOCK(ra_lock); 7491da177e4SLinus Torvalds 7501da177e4SLinus Torvalds static inline struct raparms * 7511da177e4SLinus Torvalds nfsd_get_raparms(dev_t dev, ino_t ino) 7521da177e4SLinus Torvalds { 7531da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 7541da177e4SLinus Torvalds int depth = 0; 7551da177e4SLinus Torvalds 7561da177e4SLinus Torvalds spin_lock(&ra_lock); 7571da177e4SLinus Torvalds for (rap = &raparm_cache; (ra = *rap); rap = &ra->p_next) { 7581da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 7591da177e4SLinus Torvalds goto found; 7601da177e4SLinus Torvalds depth++; 7611da177e4SLinus Torvalds if (ra->p_count == 0) 7621da177e4SLinus Torvalds frap = rap; 7631da177e4SLinus Torvalds } 7641da177e4SLinus Torvalds depth = nfsdstats.ra_size*11/10; 7651da177e4SLinus Torvalds if (!frap) { 7661da177e4SLinus Torvalds spin_unlock(&ra_lock); 7671da177e4SLinus Torvalds return NULL; 7681da177e4SLinus Torvalds } 7691da177e4SLinus Torvalds rap = frap; 7701da177e4SLinus Torvalds ra = *frap; 7711da177e4SLinus Torvalds ra->p_dev = dev; 7721da177e4SLinus Torvalds ra->p_ino = ino; 7731da177e4SLinus Torvalds ra->p_set = 0; 7741da177e4SLinus Torvalds found: 7751da177e4SLinus Torvalds if (rap != &raparm_cache) { 7761da177e4SLinus Torvalds *rap = ra->p_next; 7771da177e4SLinus Torvalds ra->p_next = raparm_cache; 7781da177e4SLinus Torvalds raparm_cache = ra; 7791da177e4SLinus Torvalds } 7801da177e4SLinus Torvalds ra->p_count++; 7811da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 7821da177e4SLinus Torvalds spin_unlock(&ra_lock); 7831da177e4SLinus Torvalds return ra; 7841da177e4SLinus Torvalds } 7851da177e4SLinus Torvalds 7861da177e4SLinus Torvalds /* 7871da177e4SLinus Torvalds * Grab and keep cached pages assosiated with a file in the svc_rqst 7881da177e4SLinus Torvalds * so that they can be passed to the netowork sendmsg/sendpage routines 7891da177e4SLinus Torvalds * directrly. They will be released after the sending has completed. 7901da177e4SLinus Torvalds */ 7911da177e4SLinus Torvalds static int 7921da177e4SLinus Torvalds nfsd_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset , unsigned long size) 7931da177e4SLinus Torvalds { 7941da177e4SLinus Torvalds unsigned long count = desc->count; 7951da177e4SLinus Torvalds struct svc_rqst *rqstp = desc->arg.data; 7961da177e4SLinus Torvalds 7971da177e4SLinus Torvalds if (size > count) 7981da177e4SLinus Torvalds size = count; 7991da177e4SLinus Torvalds 8001da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 8011da177e4SLinus Torvalds get_page(page); 8021da177e4SLinus Torvalds rqstp->rq_respages[rqstp->rq_resused++] = page; 8031da177e4SLinus Torvalds rqstp->rq_res.page_base = offset; 8041da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 8051da177e4SLinus Torvalds } else if (page != rqstp->rq_respages[rqstp->rq_resused-1]) { 8061da177e4SLinus Torvalds get_page(page); 8071da177e4SLinus Torvalds rqstp->rq_respages[rqstp->rq_resused++] = page; 8081da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8091da177e4SLinus Torvalds } else { 8101da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8111da177e4SLinus Torvalds } 8121da177e4SLinus Torvalds 8131da177e4SLinus Torvalds desc->count = count - size; 8141da177e4SLinus Torvalds desc->written += size; 8151da177e4SLinus Torvalds return size; 8161da177e4SLinus Torvalds } 8171da177e4SLinus Torvalds 818*7e8f0593SNeilBrown static int 8191da177e4SLinus Torvalds nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 8201da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 8211da177e4SLinus Torvalds { 8221da177e4SLinus Torvalds struct inode *inode; 8231da177e4SLinus Torvalds struct raparms *ra; 8241da177e4SLinus Torvalds mm_segment_t oldfs; 8251da177e4SLinus Torvalds int err; 8261da177e4SLinus Torvalds 8271da177e4SLinus Torvalds err = nfserr_perm; 8281da177e4SLinus Torvalds inode = file->f_dentry->d_inode; 8291da177e4SLinus Torvalds #ifdef MSNFS 8301da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 8311da177e4SLinus Torvalds (!lock_may_read(inode, offset, *count))) 8321da177e4SLinus Torvalds goto out; 8331da177e4SLinus Torvalds #endif 8341da177e4SLinus Torvalds 8351da177e4SLinus Torvalds /* Get readahead parameters */ 8361da177e4SLinus Torvalds ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); 8371da177e4SLinus Torvalds 8381da177e4SLinus Torvalds if (ra && ra->p_set) 8391da177e4SLinus Torvalds file->f_ra = ra->p_ra; 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvalds if (file->f_op->sendfile) { 8421da177e4SLinus Torvalds svc_pushback_unused_pages(rqstp); 8431da177e4SLinus Torvalds err = file->f_op->sendfile(file, &offset, *count, 8441da177e4SLinus Torvalds nfsd_read_actor, rqstp); 8451da177e4SLinus Torvalds } else { 8461da177e4SLinus Torvalds oldfs = get_fs(); 8471da177e4SLinus Torvalds set_fs(KERNEL_DS); 8481da177e4SLinus Torvalds err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); 8491da177e4SLinus Torvalds set_fs(oldfs); 8501da177e4SLinus Torvalds } 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvalds /* Write back readahead params */ 8531da177e4SLinus Torvalds if (ra) { 8541da177e4SLinus Torvalds spin_lock(&ra_lock); 8551da177e4SLinus Torvalds ra->p_ra = file->f_ra; 8561da177e4SLinus Torvalds ra->p_set = 1; 8571da177e4SLinus Torvalds ra->p_count--; 8581da177e4SLinus Torvalds spin_unlock(&ra_lock); 8591da177e4SLinus Torvalds } 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds if (err >= 0) { 8621da177e4SLinus Torvalds nfsdstats.io_read += err; 8631da177e4SLinus Torvalds *count = err; 8641da177e4SLinus Torvalds err = 0; 8650eeca283SRobert Love fsnotify_access(file->f_dentry); 8661da177e4SLinus Torvalds } else 8671da177e4SLinus Torvalds err = nfserrno(err); 8681da177e4SLinus Torvalds out: 8691da177e4SLinus Torvalds return err; 8701da177e4SLinus Torvalds } 8711da177e4SLinus Torvalds 8729f708e40SNeil Brown static void kill_suid(struct dentry *dentry) 8739f708e40SNeil Brown { 8749f708e40SNeil Brown struct iattr ia; 8759f708e40SNeil Brown ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID; 8769f708e40SNeil Brown 8771b1dcc1bSJes Sorensen mutex_lock(&dentry->d_inode->i_mutex); 8789f708e40SNeil Brown notify_change(dentry, &ia); 8791b1dcc1bSJes Sorensen mutex_unlock(&dentry->d_inode->i_mutex); 8809f708e40SNeil Brown } 8819f708e40SNeil Brown 882*7e8f0593SNeilBrown static int 8831da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 8841da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 8851da177e4SLinus Torvalds unsigned long cnt, int *stablep) 8861da177e4SLinus Torvalds { 8871da177e4SLinus Torvalds struct svc_export *exp; 8881da177e4SLinus Torvalds struct dentry *dentry; 8891da177e4SLinus Torvalds struct inode *inode; 8901da177e4SLinus Torvalds mm_segment_t oldfs; 8911da177e4SLinus Torvalds int err = 0; 8921da177e4SLinus Torvalds int stable = *stablep; 8931da177e4SLinus Torvalds 8941da177e4SLinus Torvalds err = nfserr_perm; 8951da177e4SLinus Torvalds 8961da177e4SLinus Torvalds #ifdef MSNFS 8971da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 8981da177e4SLinus Torvalds (!lock_may_write(file->f_dentry->d_inode, offset, cnt))) 8991da177e4SLinus Torvalds goto out; 9001da177e4SLinus Torvalds #endif 9011da177e4SLinus Torvalds 9021da177e4SLinus Torvalds dentry = file->f_dentry; 9031da177e4SLinus Torvalds inode = dentry->d_inode; 9041da177e4SLinus Torvalds exp = fhp->fh_export; 9051da177e4SLinus Torvalds 9061da177e4SLinus Torvalds /* 9071da177e4SLinus Torvalds * Request sync writes if 9081da177e4SLinus Torvalds * - the sync export option has been set, or 9091da177e4SLinus Torvalds * - the client requested O_SYNC behavior (NFSv3 feature). 9101da177e4SLinus Torvalds * - The file system doesn't support fsync(). 9111da177e4SLinus Torvalds * When gathered writes have been configured for this volume, 9121da177e4SLinus Torvalds * flushing the data to disk is handled separately below. 9131da177e4SLinus Torvalds */ 9141da177e4SLinus Torvalds 9151da177e4SLinus Torvalds if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */ 9161da177e4SLinus Torvalds stable = 2; 9171da177e4SLinus Torvalds *stablep = 2; /* FILE_SYNC */ 9181da177e4SLinus Torvalds } 9191da177e4SLinus Torvalds 9201da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 9211da177e4SLinus Torvalds stable = 0; 9221da177e4SLinus Torvalds if (stable && !EX_WGATHER(exp)) 9231da177e4SLinus Torvalds file->f_flags |= O_SYNC; 9241da177e4SLinus Torvalds 9251da177e4SLinus Torvalds /* Write the data. */ 9261da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 9271da177e4SLinus Torvalds err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); 9281da177e4SLinus Torvalds set_fs(oldfs); 9291da177e4SLinus Torvalds if (err >= 0) { 9301da177e4SLinus Torvalds nfsdstats.io_write += cnt; 9310eeca283SRobert Love fsnotify_modify(file->f_dentry); 9321da177e4SLinus Torvalds } 9331da177e4SLinus Torvalds 9341da177e4SLinus Torvalds /* clear setuid/setgid flag after write */ 9359f708e40SNeil Brown if (err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) 9369f708e40SNeil Brown kill_suid(dentry); 9371da177e4SLinus Torvalds 9381da177e4SLinus Torvalds if (err >= 0 && stable) { 9391da177e4SLinus Torvalds static ino_t last_ino; 9401da177e4SLinus Torvalds static dev_t last_dev; 9411da177e4SLinus Torvalds 9421da177e4SLinus Torvalds /* 9431da177e4SLinus Torvalds * Gathered writes: If another process is currently 9441da177e4SLinus Torvalds * writing to the file, there's a high chance 9451da177e4SLinus Torvalds * this is another nfsd (triggered by a bulk write 9461da177e4SLinus Torvalds * from a client's biod). Rather than syncing the 9471da177e4SLinus Torvalds * file with each write request, we sleep for 10 msec. 9481da177e4SLinus Torvalds * 9491da177e4SLinus Torvalds * I don't know if this roughly approximates 9501da177e4SLinus Torvalds * C. Juszak's idea of gathered writes, but it's a 9511da177e4SLinus Torvalds * nice and simple solution (IMHO), and it seems to 9521da177e4SLinus Torvalds * work:-) 9531da177e4SLinus Torvalds */ 9541da177e4SLinus Torvalds if (EX_WGATHER(exp)) { 9551da177e4SLinus Torvalds if (atomic_read(&inode->i_writecount) > 1 9561da177e4SLinus Torvalds || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 9571da177e4SLinus Torvalds dprintk("nfsd: write defer %d\n", current->pid); 9581da177e4SLinus Torvalds msleep(10); 9591da177e4SLinus Torvalds dprintk("nfsd: write resume %d\n", current->pid); 9601da177e4SLinus Torvalds } 9611da177e4SLinus Torvalds 9621da177e4SLinus Torvalds if (inode->i_state & I_DIRTY) { 9631da177e4SLinus Torvalds dprintk("nfsd: write sync %d\n", current->pid); 964a334de28SDavid Shaw err=nfsd_sync(file); 9651da177e4SLinus Torvalds } 9661da177e4SLinus Torvalds #if 0 9671da177e4SLinus Torvalds wake_up(&inode->i_wait); 9681da177e4SLinus Torvalds #endif 9691da177e4SLinus Torvalds } 9701da177e4SLinus Torvalds last_ino = inode->i_ino; 9711da177e4SLinus Torvalds last_dev = inode->i_sb->s_dev; 9721da177e4SLinus Torvalds } 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds dprintk("nfsd: write complete err=%d\n", err); 9751da177e4SLinus Torvalds if (err >= 0) 9761da177e4SLinus Torvalds err = 0; 9771da177e4SLinus Torvalds else 9781da177e4SLinus Torvalds err = nfserrno(err); 9791da177e4SLinus Torvalds out: 9801da177e4SLinus Torvalds return err; 9811da177e4SLinus Torvalds } 9821da177e4SLinus Torvalds 9831da177e4SLinus Torvalds /* 9841da177e4SLinus Torvalds * Read data from a file. count must contain the requested read count 9851da177e4SLinus Torvalds * on entry. On return, *count contains the number of bytes actually read. 9861da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 9871da177e4SLinus Torvalds */ 9881da177e4SLinus Torvalds int 9891da177e4SLinus Torvalds nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 9901da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 9911da177e4SLinus Torvalds unsigned long *count) 9921da177e4SLinus Torvalds { 9931da177e4SLinus Torvalds int err; 9941da177e4SLinus Torvalds 9951da177e4SLinus Torvalds if (file) { 9961da177e4SLinus Torvalds err = nfsd_permission(fhp->fh_export, fhp->fh_dentry, 9971da177e4SLinus Torvalds MAY_READ|MAY_OWNER_OVERRIDE); 9981da177e4SLinus Torvalds if (err) 9991da177e4SLinus Torvalds goto out; 10001da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 10011da177e4SLinus Torvalds } else { 10021da177e4SLinus Torvalds err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file); 10031da177e4SLinus Torvalds if (err) 10041da177e4SLinus Torvalds goto out; 10051da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 10061da177e4SLinus Torvalds nfsd_close(file); 10071da177e4SLinus Torvalds } 10081da177e4SLinus Torvalds out: 10091da177e4SLinus Torvalds return err; 10101da177e4SLinus Torvalds } 10111da177e4SLinus Torvalds 10121da177e4SLinus Torvalds /* 10131da177e4SLinus Torvalds * Write data to a file. 10141da177e4SLinus Torvalds * The stable flag requests synchronous writes. 10151da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10161da177e4SLinus Torvalds */ 10171da177e4SLinus Torvalds int 10181da177e4SLinus Torvalds nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10191da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long cnt, 10201da177e4SLinus Torvalds int *stablep) 10211da177e4SLinus Torvalds { 10221da177e4SLinus Torvalds int err = 0; 10231da177e4SLinus Torvalds 10241da177e4SLinus Torvalds if (file) { 10251da177e4SLinus Torvalds err = nfsd_permission(fhp->fh_export, fhp->fh_dentry, 10261da177e4SLinus Torvalds MAY_WRITE|MAY_OWNER_OVERRIDE); 10271da177e4SLinus Torvalds if (err) 10281da177e4SLinus Torvalds goto out; 10291da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, 10301da177e4SLinus Torvalds stablep); 10311da177e4SLinus Torvalds } else { 10321da177e4SLinus Torvalds err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file); 10331da177e4SLinus Torvalds if (err) 10341da177e4SLinus Torvalds goto out; 10351da177e4SLinus Torvalds 10361da177e4SLinus Torvalds if (cnt) 10371da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, 10381da177e4SLinus Torvalds cnt, stablep); 10391da177e4SLinus Torvalds nfsd_close(file); 10401da177e4SLinus Torvalds } 10411da177e4SLinus Torvalds out: 10421da177e4SLinus Torvalds return err; 10431da177e4SLinus Torvalds } 10441da177e4SLinus Torvalds 10451da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 10461da177e4SLinus Torvalds /* 10471da177e4SLinus Torvalds * Commit all pending writes to stable storage. 10481da177e4SLinus Torvalds * Strictly speaking, we could sync just the indicated file region here, 10491da177e4SLinus Torvalds * but there's currently no way we can ask the VFS to do so. 10501da177e4SLinus Torvalds * 10511da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 10521da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 10531da177e4SLinus Torvalds */ 10541da177e4SLinus Torvalds int 10551da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 10561da177e4SLinus Torvalds loff_t offset, unsigned long count) 10571da177e4SLinus Torvalds { 10581da177e4SLinus Torvalds struct file *file; 10591da177e4SLinus Torvalds int err; 10601da177e4SLinus Torvalds 10611da177e4SLinus Torvalds if ((u64)count > ~(u64)offset) 10621da177e4SLinus Torvalds return nfserr_inval; 10631da177e4SLinus Torvalds 10641da177e4SLinus Torvalds if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0) 10651da177e4SLinus Torvalds return err; 10661da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 10671da177e4SLinus Torvalds if (file->f_op && file->f_op->fsync) { 1068a334de28SDavid Shaw err = nfsd_sync(file); 1069f193fbabSYAMAMOTO Takashi err = nfserrno(err); 10701da177e4SLinus Torvalds } else { 10711da177e4SLinus Torvalds err = nfserr_notsupp; 10721da177e4SLinus Torvalds } 10731da177e4SLinus Torvalds } 10741da177e4SLinus Torvalds 10751da177e4SLinus Torvalds nfsd_close(file); 10761da177e4SLinus Torvalds return err; 10771da177e4SLinus Torvalds } 10781da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 10791da177e4SLinus Torvalds 10801da177e4SLinus Torvalds /* 10811da177e4SLinus Torvalds * Create a file (regular, directory, device, fifo); UNIX sockets 10821da177e4SLinus Torvalds * not yet implemented. 10831da177e4SLinus Torvalds * If the response fh has been verified, the parent directory should 10841da177e4SLinus Torvalds * already be locked. Note that the parent directory is left locked. 10851da177e4SLinus Torvalds * 10861da177e4SLinus Torvalds * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 10871da177e4SLinus Torvalds */ 10881da177e4SLinus Torvalds int 10891da177e4SLinus Torvalds nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 10901da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 10911da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 10921da177e4SLinus Torvalds { 10931da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 10941da177e4SLinus Torvalds struct inode *dirp; 10951da177e4SLinus Torvalds int err; 10961da177e4SLinus Torvalds 10971da177e4SLinus Torvalds err = nfserr_perm; 10981da177e4SLinus Torvalds if (!flen) 10991da177e4SLinus Torvalds goto out; 11001da177e4SLinus Torvalds err = nfserr_exist; 11011da177e4SLinus Torvalds if (isdotent(fname, flen)) 11021da177e4SLinus Torvalds goto out; 11031da177e4SLinus Torvalds 11041da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); 11051da177e4SLinus Torvalds if (err) 11061da177e4SLinus Torvalds goto out; 11071da177e4SLinus Torvalds 11081da177e4SLinus Torvalds dentry = fhp->fh_dentry; 11091da177e4SLinus Torvalds dirp = dentry->d_inode; 11101da177e4SLinus Torvalds 11111da177e4SLinus Torvalds err = nfserr_notdir; 11121da177e4SLinus Torvalds if(!dirp->i_op || !dirp->i_op->lookup) 11131da177e4SLinus Torvalds goto out; 11141da177e4SLinus Torvalds /* 11151da177e4SLinus Torvalds * Check whether the response file handle has been verified yet. 11161da177e4SLinus Torvalds * If it has, the parent directory should already be locked. 11171da177e4SLinus Torvalds */ 11181da177e4SLinus Torvalds if (!resfhp->fh_dentry) { 11191da177e4SLinus Torvalds /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ 11201da177e4SLinus Torvalds fh_lock(fhp); 11211da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 11221da177e4SLinus Torvalds err = PTR_ERR(dchild); 11231da177e4SLinus Torvalds if (IS_ERR(dchild)) 11241da177e4SLinus Torvalds goto out_nfserr; 11251da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 11261da177e4SLinus Torvalds if (err) 11271da177e4SLinus Torvalds goto out; 11281da177e4SLinus Torvalds } else { 11291da177e4SLinus Torvalds /* called from nfsd_proc_create */ 11301da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 11311da177e4SLinus Torvalds if (!fhp->fh_locked) { 11321da177e4SLinus Torvalds /* not actually possible */ 11331da177e4SLinus Torvalds printk(KERN_ERR 11341da177e4SLinus Torvalds "nfsd_create: parent %s/%s not locked!\n", 11351da177e4SLinus Torvalds dentry->d_parent->d_name.name, 11361da177e4SLinus Torvalds dentry->d_name.name); 11371da177e4SLinus Torvalds err = -EIO; 11381da177e4SLinus Torvalds goto out; 11391da177e4SLinus Torvalds } 11401da177e4SLinus Torvalds } 11411da177e4SLinus Torvalds /* 11421da177e4SLinus Torvalds * Make sure the child dentry is still negative ... 11431da177e4SLinus Torvalds */ 11441da177e4SLinus Torvalds err = nfserr_exist; 11451da177e4SLinus Torvalds if (dchild->d_inode) { 11461da177e4SLinus Torvalds dprintk("nfsd_create: dentry %s/%s not negative!\n", 11471da177e4SLinus Torvalds dentry->d_name.name, dchild->d_name.name); 11481da177e4SLinus Torvalds goto out; 11491da177e4SLinus Torvalds } 11501da177e4SLinus Torvalds 11511da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 11521da177e4SLinus Torvalds iap->ia_mode = 0; 11531da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 11541da177e4SLinus Torvalds 11551da177e4SLinus Torvalds /* 11561da177e4SLinus Torvalds * Get the dir op function pointer. 11571da177e4SLinus Torvalds */ 11581da177e4SLinus Torvalds err = nfserr_perm; 11591da177e4SLinus Torvalds switch (type) { 11601da177e4SLinus Torvalds case S_IFREG: 11611da177e4SLinus Torvalds err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 11621da177e4SLinus Torvalds break; 11631da177e4SLinus Torvalds case S_IFDIR: 11641da177e4SLinus Torvalds err = vfs_mkdir(dirp, dchild, iap->ia_mode); 11651da177e4SLinus Torvalds break; 11661da177e4SLinus Torvalds case S_IFCHR: 11671da177e4SLinus Torvalds case S_IFBLK: 11681da177e4SLinus Torvalds case S_IFIFO: 11691da177e4SLinus Torvalds case S_IFSOCK: 11701da177e4SLinus Torvalds err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 11711da177e4SLinus Torvalds break; 11721da177e4SLinus Torvalds default: 11731da177e4SLinus Torvalds printk("nfsd: bad file type %o in nfsd_create\n", type); 11741da177e4SLinus Torvalds err = -EINVAL; 11751da177e4SLinus Torvalds } 11761da177e4SLinus Torvalds if (err < 0) 11771da177e4SLinus Torvalds goto out_nfserr; 11781da177e4SLinus Torvalds 11791da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 1180f193fbabSYAMAMOTO Takashi err = nfsd_sync_dir(dentry); 11811da177e4SLinus Torvalds write_inode_now(dchild->d_inode, 1); 11821da177e4SLinus Torvalds } 11831da177e4SLinus Torvalds 11841da177e4SLinus Torvalds 11851da177e4SLinus Torvalds /* Set file attributes. Mode has already been set and 11861da177e4SLinus Torvalds * setting uid/gid works only for root. Irix appears to 11871da177e4SLinus Torvalds * send along the gid when it tries to implement setgid 11881da177e4SLinus Torvalds * directories via NFS. 11891da177e4SLinus Torvalds */ 1190f193fbabSYAMAMOTO Takashi if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) { 1191f193fbabSYAMAMOTO Takashi int err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 1192f193fbabSYAMAMOTO Takashi if (err2) 1193f193fbabSYAMAMOTO Takashi err = err2; 1194f193fbabSYAMAMOTO Takashi } 11951da177e4SLinus Torvalds /* 11961da177e4SLinus Torvalds * Update the file handle to get the new inode info. 11971da177e4SLinus Torvalds */ 11981da177e4SLinus Torvalds if (!err) 11991da177e4SLinus Torvalds err = fh_update(resfhp); 12001da177e4SLinus Torvalds out: 12011da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 12021da177e4SLinus Torvalds dput(dchild); 12031da177e4SLinus Torvalds return err; 12041da177e4SLinus Torvalds 12051da177e4SLinus Torvalds out_nfserr: 12061da177e4SLinus Torvalds err = nfserrno(err); 12071da177e4SLinus Torvalds goto out; 12081da177e4SLinus Torvalds } 12091da177e4SLinus Torvalds 12101da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 12111da177e4SLinus Torvalds /* 12121da177e4SLinus Torvalds * NFSv3 version of nfsd_create 12131da177e4SLinus Torvalds */ 12141da177e4SLinus Torvalds int 12151da177e4SLinus Torvalds nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, 12161da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 12171da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 12181da177e4SLinus Torvalds int *truncp) 12191da177e4SLinus Torvalds { 12201da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 12211da177e4SLinus Torvalds struct inode *dirp; 12221da177e4SLinus Torvalds int err; 12231da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 12241da177e4SLinus Torvalds int v_mode=0; 12251da177e4SLinus Torvalds 12261da177e4SLinus Torvalds err = nfserr_perm; 12271da177e4SLinus Torvalds if (!flen) 12281da177e4SLinus Torvalds goto out; 12291da177e4SLinus Torvalds err = nfserr_exist; 12301da177e4SLinus Torvalds if (isdotent(fname, flen)) 12311da177e4SLinus Torvalds goto out; 12321da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 12331da177e4SLinus Torvalds iap->ia_mode = 0; 12341da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); 12351da177e4SLinus Torvalds if (err) 12361da177e4SLinus Torvalds goto out; 12371da177e4SLinus Torvalds 12381da177e4SLinus Torvalds dentry = fhp->fh_dentry; 12391da177e4SLinus Torvalds dirp = dentry->d_inode; 12401da177e4SLinus Torvalds 12411da177e4SLinus Torvalds /* Get all the sanity checks out of the way before 12421da177e4SLinus Torvalds * we lock the parent. */ 12431da177e4SLinus Torvalds err = nfserr_notdir; 12441da177e4SLinus Torvalds if(!dirp->i_op || !dirp->i_op->lookup) 12451da177e4SLinus Torvalds goto out; 12461da177e4SLinus Torvalds fh_lock(fhp); 12471da177e4SLinus Torvalds 12481da177e4SLinus Torvalds /* 12491da177e4SLinus Torvalds * Compose the response file handle. 12501da177e4SLinus Torvalds */ 12511da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 12521da177e4SLinus Torvalds err = PTR_ERR(dchild); 12531da177e4SLinus Torvalds if (IS_ERR(dchild)) 12541da177e4SLinus Torvalds goto out_nfserr; 12551da177e4SLinus Torvalds 12561da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 12571da177e4SLinus Torvalds if (err) 12581da177e4SLinus Torvalds goto out; 12591da177e4SLinus Torvalds 12601da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 12611da177e4SLinus Torvalds /* while the verifier would fit in mtime+atime, 12621da177e4SLinus Torvalds * solaris7 gets confused (bugid 4218508) if these have 12631da177e4SLinus Torvalds * the high bit set, so we use the mode as well 12641da177e4SLinus Torvalds */ 12651da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 12661da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 12671da177e4SLinus Torvalds v_mode = S_IFREG 12681da177e4SLinus Torvalds | ((verifier[0]&0x80000000) >> (32-7)) /* u+x */ 12691da177e4SLinus Torvalds | ((verifier[1]&0x80000000) >> (32-9)) /* u+r */ 12701da177e4SLinus Torvalds ; 12711da177e4SLinus Torvalds } 12721da177e4SLinus Torvalds 12731da177e4SLinus Torvalds if (dchild->d_inode) { 12741da177e4SLinus Torvalds err = 0; 12751da177e4SLinus Torvalds 12761da177e4SLinus Torvalds switch (createmode) { 12771da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 12781da177e4SLinus Torvalds if (! S_ISREG(dchild->d_inode->i_mode)) 12791da177e4SLinus Torvalds err = nfserr_exist; 12801da177e4SLinus Torvalds else if (truncp) { 12811da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 12821da177e4SLinus Torvalds * differently. we don't want to truncate the 12831da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 12841da177e4SLinus Torvalds * fails for some other reason. furthermore, 12851da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 12861da177e4SLinus Torvalds * according to spec! 12871da177e4SLinus Torvalds */ 12881da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 12891da177e4SLinus Torvalds } 12901da177e4SLinus Torvalds else { 12911da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 12921da177e4SLinus Torvalds goto set_attr; 12931da177e4SLinus Torvalds } 12941da177e4SLinus Torvalds break; 12951da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 12961da177e4SLinus Torvalds if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 12971da177e4SLinus Torvalds && dchild->d_inode->i_atime.tv_sec == v_atime 12981da177e4SLinus Torvalds && dchild->d_inode->i_mode == v_mode 12991da177e4SLinus Torvalds && dchild->d_inode->i_size == 0 ) 13001da177e4SLinus Torvalds break; 13011da177e4SLinus Torvalds /* fallthru */ 13021da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 13031da177e4SLinus Torvalds err = nfserr_exist; 13041da177e4SLinus Torvalds } 13051da177e4SLinus Torvalds goto out; 13061da177e4SLinus Torvalds } 13071da177e4SLinus Torvalds 13081da177e4SLinus Torvalds err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 13091da177e4SLinus Torvalds if (err < 0) 13101da177e4SLinus Torvalds goto out_nfserr; 13111da177e4SLinus Torvalds 13121da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 1313f193fbabSYAMAMOTO Takashi err = nfsd_sync_dir(dentry); 1314f193fbabSYAMAMOTO Takashi if (err) 1315f193fbabSYAMAMOTO Takashi err = nfserrno(err); 13161da177e4SLinus Torvalds /* setattr will sync the child (or not) */ 13171da177e4SLinus Torvalds } 13181da177e4SLinus Torvalds 13191da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 13201da177e4SLinus Torvalds /* Cram the verifier into atime/mtime/mode */ 13211da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 13221da177e4SLinus Torvalds | ATTR_MTIME_SET|ATTR_ATIME_SET 13231da177e4SLinus Torvalds | ATTR_MODE; 13241da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 13251da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 13261da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 13271da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 13281da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 13291da177e4SLinus Torvalds iap->ia_mode = v_mode; 13301da177e4SLinus Torvalds } 13311da177e4SLinus Torvalds 13321da177e4SLinus Torvalds /* Set file attributes. 13331da177e4SLinus Torvalds * Mode has already been set but we might need to reset it 13341da177e4SLinus Torvalds * for CREATE_EXCLUSIVE 13351da177e4SLinus Torvalds * Irix appears to send along the gid when it tries to 13361da177e4SLinus Torvalds * implement setgid directories via NFS. Clear out all that cruft. 13371da177e4SLinus Torvalds */ 13381da177e4SLinus Torvalds set_attr: 1339f193fbabSYAMAMOTO Takashi if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID)) != 0) { 1340f193fbabSYAMAMOTO Takashi int err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 1341f193fbabSYAMAMOTO Takashi if (err2) 1342f193fbabSYAMAMOTO Takashi err = nfserrno(err2); 1343f193fbabSYAMAMOTO Takashi } 1344f193fbabSYAMAMOTO Takashi 1345f193fbabSYAMAMOTO Takashi /* 1346f193fbabSYAMAMOTO Takashi * Update the filehandle to get the new inode info. 1347f193fbabSYAMAMOTO Takashi */ 1348f193fbabSYAMAMOTO Takashi if (!err) 1349f193fbabSYAMAMOTO Takashi err = fh_update(resfhp); 13501da177e4SLinus Torvalds 13511da177e4SLinus Torvalds out: 13521da177e4SLinus Torvalds fh_unlock(fhp); 13531da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 13541da177e4SLinus Torvalds dput(dchild); 13551da177e4SLinus Torvalds return err; 13561da177e4SLinus Torvalds 13571da177e4SLinus Torvalds out_nfserr: 13581da177e4SLinus Torvalds err = nfserrno(err); 13591da177e4SLinus Torvalds goto out; 13601da177e4SLinus Torvalds } 13611da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 13621da177e4SLinus Torvalds 13631da177e4SLinus Torvalds /* 13641da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 13651da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 13661da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 13671da177e4SLinus Torvalds */ 13681da177e4SLinus Torvalds int 13691da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 13701da177e4SLinus Torvalds { 13711da177e4SLinus Torvalds struct dentry *dentry; 13721da177e4SLinus Torvalds struct inode *inode; 13731da177e4SLinus Torvalds mm_segment_t oldfs; 13741da177e4SLinus Torvalds int err; 13751da177e4SLinus Torvalds 13761da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP); 13771da177e4SLinus Torvalds if (err) 13781da177e4SLinus Torvalds goto out; 13791da177e4SLinus Torvalds 13801da177e4SLinus Torvalds dentry = fhp->fh_dentry; 13811da177e4SLinus Torvalds inode = dentry->d_inode; 13821da177e4SLinus Torvalds 13831da177e4SLinus Torvalds err = nfserr_inval; 13841da177e4SLinus Torvalds if (!inode->i_op || !inode->i_op->readlink) 13851da177e4SLinus Torvalds goto out; 13861da177e4SLinus Torvalds 13871da177e4SLinus Torvalds touch_atime(fhp->fh_export->ex_mnt, dentry); 13881da177e4SLinus Torvalds /* N.B. Why does this call need a get_fs()?? 13891da177e4SLinus Torvalds * Remove the set_fs and watch the fireworks:-) --okir 13901da177e4SLinus Torvalds */ 13911da177e4SLinus Torvalds 13921da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 13931da177e4SLinus Torvalds err = inode->i_op->readlink(dentry, buf, *lenp); 13941da177e4SLinus Torvalds set_fs(oldfs); 13951da177e4SLinus Torvalds 13961da177e4SLinus Torvalds if (err < 0) 13971da177e4SLinus Torvalds goto out_nfserr; 13981da177e4SLinus Torvalds *lenp = err; 13991da177e4SLinus Torvalds err = 0; 14001da177e4SLinus Torvalds out: 14011da177e4SLinus Torvalds return err; 14021da177e4SLinus Torvalds 14031da177e4SLinus Torvalds out_nfserr: 14041da177e4SLinus Torvalds err = nfserrno(err); 14051da177e4SLinus Torvalds goto out; 14061da177e4SLinus Torvalds } 14071da177e4SLinus Torvalds 14081da177e4SLinus Torvalds /* 14091da177e4SLinus Torvalds * Create a symlink and look up its inode 14101da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 14111da177e4SLinus Torvalds */ 14121da177e4SLinus Torvalds int 14131da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 14141da177e4SLinus Torvalds char *fname, int flen, 14151da177e4SLinus Torvalds char *path, int plen, 14161da177e4SLinus Torvalds struct svc_fh *resfhp, 14171da177e4SLinus Torvalds struct iattr *iap) 14181da177e4SLinus Torvalds { 14191da177e4SLinus Torvalds struct dentry *dentry, *dnew; 14201da177e4SLinus Torvalds int err, cerr; 14211da177e4SLinus Torvalds umode_t mode; 14221da177e4SLinus Torvalds 14231da177e4SLinus Torvalds err = nfserr_noent; 14241da177e4SLinus Torvalds if (!flen || !plen) 14251da177e4SLinus Torvalds goto out; 14261da177e4SLinus Torvalds err = nfserr_exist; 14271da177e4SLinus Torvalds if (isdotent(fname, flen)) 14281da177e4SLinus Torvalds goto out; 14291da177e4SLinus Torvalds 14301da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); 14311da177e4SLinus Torvalds if (err) 14321da177e4SLinus Torvalds goto out; 14331da177e4SLinus Torvalds fh_lock(fhp); 14341da177e4SLinus Torvalds dentry = fhp->fh_dentry; 14351da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 14361da177e4SLinus Torvalds err = PTR_ERR(dnew); 14371da177e4SLinus Torvalds if (IS_ERR(dnew)) 14381da177e4SLinus Torvalds goto out_nfserr; 14391da177e4SLinus Torvalds 14401da177e4SLinus Torvalds mode = S_IALLUGO; 14411da177e4SLinus Torvalds /* Only the MODE ATTRibute is even vaguely meaningful */ 14421da177e4SLinus Torvalds if (iap && (iap->ia_valid & ATTR_MODE)) 14431da177e4SLinus Torvalds mode = iap->ia_mode & S_IALLUGO; 14441da177e4SLinus Torvalds 14451da177e4SLinus Torvalds if (unlikely(path[plen] != 0)) { 14461da177e4SLinus Torvalds char *path_alloced = kmalloc(plen+1, GFP_KERNEL); 14471da177e4SLinus Torvalds if (path_alloced == NULL) 14481da177e4SLinus Torvalds err = -ENOMEM; 14491da177e4SLinus Torvalds else { 14501da177e4SLinus Torvalds strncpy(path_alloced, path, plen); 14511da177e4SLinus Torvalds path_alloced[plen] = 0; 14521da177e4SLinus Torvalds err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode); 14531da177e4SLinus Torvalds kfree(path_alloced); 14541da177e4SLinus Torvalds } 14551da177e4SLinus Torvalds } else 14561da177e4SLinus Torvalds err = vfs_symlink(dentry->d_inode, dnew, path, mode); 14571da177e4SLinus Torvalds 1458f193fbabSYAMAMOTO Takashi if (!err) 14591da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 1460f193fbabSYAMAMOTO Takashi err = nfsd_sync_dir(dentry); 1461f193fbabSYAMAMOTO Takashi if (err) 14621da177e4SLinus Torvalds err = nfserrno(err); 14631da177e4SLinus Torvalds fh_unlock(fhp); 14641da177e4SLinus Torvalds 14651da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 14661da177e4SLinus Torvalds dput(dnew); 14671da177e4SLinus Torvalds if (err==0) err = cerr; 14681da177e4SLinus Torvalds out: 14691da177e4SLinus Torvalds return err; 14701da177e4SLinus Torvalds 14711da177e4SLinus Torvalds out_nfserr: 14721da177e4SLinus Torvalds err = nfserrno(err); 14731da177e4SLinus Torvalds goto out; 14741da177e4SLinus Torvalds } 14751da177e4SLinus Torvalds 14761da177e4SLinus Torvalds /* 14771da177e4SLinus Torvalds * Create a hardlink 14781da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 14791da177e4SLinus Torvalds */ 14801da177e4SLinus Torvalds int 14811da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 14821da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 14831da177e4SLinus Torvalds { 14841da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 14851da177e4SLinus Torvalds struct inode *dirp, *dest; 14861da177e4SLinus Torvalds int err; 14871da177e4SLinus Torvalds 14881da177e4SLinus Torvalds err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE); 14891da177e4SLinus Torvalds if (err) 14901da177e4SLinus Torvalds goto out; 14911da177e4SLinus Torvalds err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP); 14921da177e4SLinus Torvalds if (err) 14931da177e4SLinus Torvalds goto out; 14941da177e4SLinus Torvalds 14951da177e4SLinus Torvalds err = nfserr_perm; 14961da177e4SLinus Torvalds if (!len) 14971da177e4SLinus Torvalds goto out; 14981da177e4SLinus Torvalds err = nfserr_exist; 14991da177e4SLinus Torvalds if (isdotent(name, len)) 15001da177e4SLinus Torvalds goto out; 15011da177e4SLinus Torvalds 15021da177e4SLinus Torvalds fh_lock(ffhp); 15031da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 15041da177e4SLinus Torvalds dirp = ddir->d_inode; 15051da177e4SLinus Torvalds 15061da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 15071da177e4SLinus Torvalds err = PTR_ERR(dnew); 15081da177e4SLinus Torvalds if (IS_ERR(dnew)) 15091da177e4SLinus Torvalds goto out_nfserr; 15101da177e4SLinus Torvalds 15111da177e4SLinus Torvalds dold = tfhp->fh_dentry; 15121da177e4SLinus Torvalds dest = dold->d_inode; 15131da177e4SLinus Torvalds 15141da177e4SLinus Torvalds err = vfs_link(dold, dirp, dnew); 15151da177e4SLinus Torvalds if (!err) { 15161da177e4SLinus Torvalds if (EX_ISSYNC(ffhp->fh_export)) { 1517f193fbabSYAMAMOTO Takashi err = nfsd_sync_dir(ddir); 15181da177e4SLinus Torvalds write_inode_now(dest, 1); 1519f193fbabSYAMAMOTO Takashi if (err) 1520f193fbabSYAMAMOTO Takashi err = nfserrno(err); 15211da177e4SLinus Torvalds } 15221da177e4SLinus Torvalds } else { 15231da177e4SLinus Torvalds if (err == -EXDEV && rqstp->rq_vers == 2) 15241da177e4SLinus Torvalds err = nfserr_acces; 15251da177e4SLinus Torvalds else 15261da177e4SLinus Torvalds err = nfserrno(err); 15271da177e4SLinus Torvalds } 15281da177e4SLinus Torvalds 15291da177e4SLinus Torvalds fh_unlock(ffhp); 15301da177e4SLinus Torvalds dput(dnew); 15311da177e4SLinus Torvalds out: 15321da177e4SLinus Torvalds return err; 15331da177e4SLinus Torvalds 15341da177e4SLinus Torvalds out_nfserr: 15351da177e4SLinus Torvalds err = nfserrno(err); 15361da177e4SLinus Torvalds goto out; 15371da177e4SLinus Torvalds } 15381da177e4SLinus Torvalds 15391da177e4SLinus Torvalds /* 15401da177e4SLinus Torvalds * Rename a file 15411da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 15421da177e4SLinus Torvalds */ 15431da177e4SLinus Torvalds int 15441da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 15451da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 15461da177e4SLinus Torvalds { 15471da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 15481da177e4SLinus Torvalds struct inode *fdir, *tdir; 15491da177e4SLinus Torvalds int err; 15501da177e4SLinus Torvalds 15511da177e4SLinus Torvalds err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE); 15521da177e4SLinus Torvalds if (err) 15531da177e4SLinus Torvalds goto out; 15541da177e4SLinus Torvalds err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE); 15551da177e4SLinus Torvalds if (err) 15561da177e4SLinus Torvalds goto out; 15571da177e4SLinus Torvalds 15581da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 15591da177e4SLinus Torvalds fdir = fdentry->d_inode; 15601da177e4SLinus Torvalds 15611da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 15621da177e4SLinus Torvalds tdir = tdentry->d_inode; 15631da177e4SLinus Torvalds 15641da177e4SLinus Torvalds err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; 15651da177e4SLinus Torvalds if (fdir->i_sb != tdir->i_sb) 15661da177e4SLinus Torvalds goto out; 15671da177e4SLinus Torvalds 15681da177e4SLinus Torvalds err = nfserr_perm; 15691da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 15701da177e4SLinus Torvalds goto out; 15711da177e4SLinus Torvalds 15721da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 15731da177e4SLinus Torvalds * so do it by hand */ 15741da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 15751da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 1; 15761da177e4SLinus Torvalds fill_pre_wcc(ffhp); 15771da177e4SLinus Torvalds fill_pre_wcc(tfhp); 15781da177e4SLinus Torvalds 15791da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 15801da177e4SLinus Torvalds err = PTR_ERR(odentry); 15811da177e4SLinus Torvalds if (IS_ERR(odentry)) 15821da177e4SLinus Torvalds goto out_nfserr; 15831da177e4SLinus Torvalds 15841da177e4SLinus Torvalds err = -ENOENT; 15851da177e4SLinus Torvalds if (!odentry->d_inode) 15861da177e4SLinus Torvalds goto out_dput_old; 15871da177e4SLinus Torvalds err = -EINVAL; 15881da177e4SLinus Torvalds if (odentry == trap) 15891da177e4SLinus Torvalds goto out_dput_old; 15901da177e4SLinus Torvalds 15911da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 15921da177e4SLinus Torvalds err = PTR_ERR(ndentry); 15931da177e4SLinus Torvalds if (IS_ERR(ndentry)) 15941da177e4SLinus Torvalds goto out_dput_old; 15951da177e4SLinus Torvalds err = -ENOTEMPTY; 15961da177e4SLinus Torvalds if (ndentry == trap) 15971da177e4SLinus Torvalds goto out_dput_new; 15981da177e4SLinus Torvalds 15991da177e4SLinus Torvalds #ifdef MSNFS 16001da177e4SLinus Torvalds if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) && 16011da177e4SLinus Torvalds ((atomic_read(&odentry->d_count) > 1) 16021da177e4SLinus Torvalds || (atomic_read(&ndentry->d_count) > 1))) { 16031da177e4SLinus Torvalds err = nfserr_perm; 16041da177e4SLinus Torvalds } else 16051da177e4SLinus Torvalds #endif 16061da177e4SLinus Torvalds err = vfs_rename(fdir, odentry, tdir, ndentry); 16071da177e4SLinus Torvalds if (!err && EX_ISSYNC(tfhp->fh_export)) { 1608f193fbabSYAMAMOTO Takashi err = nfsd_sync_dir(tdentry); 1609f193fbabSYAMAMOTO Takashi if (!err) 1610f193fbabSYAMAMOTO Takashi err = nfsd_sync_dir(fdentry); 16111da177e4SLinus Torvalds } 16121da177e4SLinus Torvalds 16131da177e4SLinus Torvalds out_dput_new: 16141da177e4SLinus Torvalds dput(ndentry); 16151da177e4SLinus Torvalds out_dput_old: 16161da177e4SLinus Torvalds dput(odentry); 16171da177e4SLinus Torvalds out_nfserr: 16181da177e4SLinus Torvalds if (err) 16191da177e4SLinus Torvalds err = nfserrno(err); 16201da177e4SLinus Torvalds 16211da177e4SLinus Torvalds /* we cannot reply on fh_unlock on the two filehandles, 16221da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 16231da177e4SLinus Torvalds * were the same, so again we do it by hand 16241da177e4SLinus Torvalds */ 16251da177e4SLinus Torvalds fill_post_wcc(ffhp); 16261da177e4SLinus Torvalds fill_post_wcc(tfhp); 16271da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 16281da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 0; 16291da177e4SLinus Torvalds 16301da177e4SLinus Torvalds out: 16311da177e4SLinus Torvalds return err; 16321da177e4SLinus Torvalds } 16331da177e4SLinus Torvalds 16341da177e4SLinus Torvalds /* 16351da177e4SLinus Torvalds * Unlink a file or directory 16361da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 16371da177e4SLinus Torvalds */ 16381da177e4SLinus Torvalds int 16391da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 16401da177e4SLinus Torvalds char *fname, int flen) 16411da177e4SLinus Torvalds { 16421da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 16431da177e4SLinus Torvalds struct inode *dirp; 16441da177e4SLinus Torvalds int err; 16451da177e4SLinus Torvalds 16461da177e4SLinus Torvalds err = nfserr_acces; 16471da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 16481da177e4SLinus Torvalds goto out; 16491da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE); 16501da177e4SLinus Torvalds if (err) 16511da177e4SLinus Torvalds goto out; 16521da177e4SLinus Torvalds 16531da177e4SLinus Torvalds fh_lock(fhp); 16541da177e4SLinus Torvalds dentry = fhp->fh_dentry; 16551da177e4SLinus Torvalds dirp = dentry->d_inode; 16561da177e4SLinus Torvalds 16571da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 16581da177e4SLinus Torvalds err = PTR_ERR(rdentry); 16591da177e4SLinus Torvalds if (IS_ERR(rdentry)) 16601da177e4SLinus Torvalds goto out_nfserr; 16611da177e4SLinus Torvalds 16621da177e4SLinus Torvalds if (!rdentry->d_inode) { 16631da177e4SLinus Torvalds dput(rdentry); 16641da177e4SLinus Torvalds err = nfserr_noent; 16651da177e4SLinus Torvalds goto out; 16661da177e4SLinus Torvalds } 16671da177e4SLinus Torvalds 16681da177e4SLinus Torvalds if (!type) 16691da177e4SLinus Torvalds type = rdentry->d_inode->i_mode & S_IFMT; 16701da177e4SLinus Torvalds 16711da177e4SLinus Torvalds if (type != S_IFDIR) { /* It's UNLINK */ 16721da177e4SLinus Torvalds #ifdef MSNFS 16731da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 16741da177e4SLinus Torvalds (atomic_read(&rdentry->d_count) > 1)) { 16751da177e4SLinus Torvalds err = nfserr_perm; 16761da177e4SLinus Torvalds } else 16771da177e4SLinus Torvalds #endif 16781da177e4SLinus Torvalds err = vfs_unlink(dirp, rdentry); 16791da177e4SLinus Torvalds } else { /* It's RMDIR */ 16801da177e4SLinus Torvalds err = vfs_rmdir(dirp, rdentry); 16811da177e4SLinus Torvalds } 16821da177e4SLinus Torvalds 16831da177e4SLinus Torvalds dput(rdentry); 16841da177e4SLinus Torvalds 1685f193fbabSYAMAMOTO Takashi if (err == 0 && 1686f193fbabSYAMAMOTO Takashi EX_ISSYNC(fhp->fh_export)) 1687f193fbabSYAMAMOTO Takashi err = nfsd_sync_dir(dentry); 16881da177e4SLinus Torvalds 16891da177e4SLinus Torvalds out_nfserr: 16901da177e4SLinus Torvalds err = nfserrno(err); 1691f193fbabSYAMAMOTO Takashi out: 1692f193fbabSYAMAMOTO Takashi return err; 16931da177e4SLinus Torvalds } 16941da177e4SLinus Torvalds 16951da177e4SLinus Torvalds /* 16961da177e4SLinus Torvalds * Read entries from a directory. 16971da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 16981da177e4SLinus Torvalds */ 16991da177e4SLinus Torvalds int 17001da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 17011da177e4SLinus Torvalds struct readdir_cd *cdp, encode_dent_fn func) 17021da177e4SLinus Torvalds { 17031da177e4SLinus Torvalds int err; 17041da177e4SLinus Torvalds struct file *file; 17051da177e4SLinus Torvalds loff_t offset = *offsetp; 17061da177e4SLinus Torvalds 17071da177e4SLinus Torvalds err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file); 17081da177e4SLinus Torvalds if (err) 17091da177e4SLinus Torvalds goto out; 17101da177e4SLinus Torvalds 17111da177e4SLinus Torvalds offset = vfs_llseek(file, offset, 0); 17121da177e4SLinus Torvalds if (offset < 0) { 17131da177e4SLinus Torvalds err = nfserrno((int)offset); 17141da177e4SLinus Torvalds goto out_close; 17151da177e4SLinus Torvalds } 17161da177e4SLinus Torvalds 17171da177e4SLinus Torvalds /* 17181da177e4SLinus Torvalds * Read the directory entries. This silly loop is necessary because 17191da177e4SLinus Torvalds * readdir() is not guaranteed to fill up the entire buffer, but 17201da177e4SLinus Torvalds * may choose to do less. 17211da177e4SLinus Torvalds */ 17221da177e4SLinus Torvalds 17231da177e4SLinus Torvalds do { 17241da177e4SLinus Torvalds cdp->err = nfserr_eof; /* will be cleared on successful read */ 17251da177e4SLinus Torvalds err = vfs_readdir(file, (filldir_t) func, cdp); 17261da177e4SLinus Torvalds } while (err >=0 && cdp->err == nfs_ok); 17271da177e4SLinus Torvalds if (err) 17281da177e4SLinus Torvalds err = nfserrno(err); 17291da177e4SLinus Torvalds else 17301da177e4SLinus Torvalds err = cdp->err; 17311da177e4SLinus Torvalds *offsetp = vfs_llseek(file, 0, 1); 17321da177e4SLinus Torvalds 17331da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 17341da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 17351da177e4SLinus Torvalds out_close: 17361da177e4SLinus Torvalds nfsd_close(file); 17371da177e4SLinus Torvalds out: 17381da177e4SLinus Torvalds return err; 17391da177e4SLinus Torvalds } 17401da177e4SLinus Torvalds 17411da177e4SLinus Torvalds /* 17421da177e4SLinus Torvalds * Get file system stats 17431da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 17441da177e4SLinus Torvalds */ 17451da177e4SLinus Torvalds int 17461da177e4SLinus Torvalds nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat) 17471da177e4SLinus Torvalds { 17481da177e4SLinus Torvalds int err = fh_verify(rqstp, fhp, 0, MAY_NOP); 17491da177e4SLinus Torvalds if (!err && vfs_statfs(fhp->fh_dentry->d_inode->i_sb,stat)) 17501da177e4SLinus Torvalds err = nfserr_io; 17511da177e4SLinus Torvalds return err; 17521da177e4SLinus Torvalds } 17531da177e4SLinus Torvalds 17541da177e4SLinus Torvalds /* 17551da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 17561da177e4SLinus Torvalds */ 17571da177e4SLinus Torvalds int 17581da177e4SLinus Torvalds nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc) 17591da177e4SLinus Torvalds { 17601da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 17611da177e4SLinus Torvalds int err; 17621da177e4SLinus Torvalds 17631da177e4SLinus Torvalds if (acc == MAY_NOP) 17641da177e4SLinus Torvalds return 0; 17651da177e4SLinus Torvalds #if 0 17661da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 17671da177e4SLinus Torvalds acc, 17681da177e4SLinus Torvalds (acc & MAY_READ)? " read" : "", 17691da177e4SLinus Torvalds (acc & MAY_WRITE)? " write" : "", 17701da177e4SLinus Torvalds (acc & MAY_EXEC)? " exec" : "", 17711da177e4SLinus Torvalds (acc & MAY_SATTR)? " sattr" : "", 17721da177e4SLinus Torvalds (acc & MAY_TRUNC)? " trunc" : "", 17731da177e4SLinus Torvalds (acc & MAY_LOCK)? " lock" : "", 17741da177e4SLinus Torvalds (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "", 17751da177e4SLinus Torvalds inode->i_mode, 17761da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 17771da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 17781da177e4SLinus Torvalds IS_RDONLY(inode)? " ro" : ""); 17791da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 17801da177e4SLinus Torvalds inode->i_uid, inode->i_gid, current->fsuid, current->fsgid); 17811da177e4SLinus Torvalds #endif 17821da177e4SLinus Torvalds 17831da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 17841da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 17851da177e4SLinus Torvalds * device special file, we ignore rofs. 17861da177e4SLinus Torvalds */ 17871da177e4SLinus Torvalds if (!(acc & MAY_LOCAL_ACCESS)) 17881da177e4SLinus Torvalds if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) { 17891da177e4SLinus Torvalds if (EX_RDONLY(exp) || IS_RDONLY(inode)) 17901da177e4SLinus Torvalds return nfserr_rofs; 17911da177e4SLinus Torvalds if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode)) 17921da177e4SLinus Torvalds return nfserr_perm; 17931da177e4SLinus Torvalds } 17941da177e4SLinus Torvalds if ((acc & MAY_TRUNC) && IS_APPEND(inode)) 17951da177e4SLinus Torvalds return nfserr_perm; 17961da177e4SLinus Torvalds 17971da177e4SLinus Torvalds if (acc & MAY_LOCK) { 17981da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 17991da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 18001da177e4SLinus Torvalds * ownership 18011da177e4SLinus Torvalds */ 18021da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 18031da177e4SLinus Torvalds return 0; 18041da177e4SLinus Torvalds else 18051da177e4SLinus Torvalds acc = MAY_READ | MAY_OWNER_OVERRIDE; 18061da177e4SLinus Torvalds } 18071da177e4SLinus Torvalds /* 18081da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 18091da177e4SLinus Torvalds * would normally be checked at open time. This is to make 18101da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 18111da177e4SLinus Torvalds * 18121da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 18131da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 18141da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 18151da177e4SLinus Torvalds * always implies file truncation. 18161da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 18171da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 18181da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 18191da177e4SLinus Torvalds * with NFSv3. 18201da177e4SLinus Torvalds */ 18211da177e4SLinus Torvalds if ((acc & MAY_OWNER_OVERRIDE) && 18221da177e4SLinus Torvalds inode->i_uid == current->fsuid) 18231da177e4SLinus Torvalds return 0; 18241da177e4SLinus Torvalds 18251da177e4SLinus Torvalds err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL); 18261da177e4SLinus Torvalds 18271da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 18281da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 18291da177e4SLinus Torvalds acc == (MAY_READ | MAY_OWNER_OVERRIDE)) 18301da177e4SLinus Torvalds err = permission(inode, MAY_EXEC, NULL); 18311da177e4SLinus Torvalds 18321da177e4SLinus Torvalds return err? nfserrno(err) : 0; 18331da177e4SLinus Torvalds } 18341da177e4SLinus Torvalds 18351da177e4SLinus Torvalds void 18361da177e4SLinus Torvalds nfsd_racache_shutdown(void) 18371da177e4SLinus Torvalds { 18381da177e4SLinus Torvalds if (!raparm_cache) 18391da177e4SLinus Torvalds return; 18401da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 18411da177e4SLinus Torvalds kfree(raparml); 18421da177e4SLinus Torvalds raparm_cache = raparml = NULL; 18431da177e4SLinus Torvalds } 18441da177e4SLinus Torvalds /* 18451da177e4SLinus Torvalds * Initialize readahead param cache 18461da177e4SLinus Torvalds */ 18471da177e4SLinus Torvalds int 18481da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 18491da177e4SLinus Torvalds { 18501da177e4SLinus Torvalds int i; 18511da177e4SLinus Torvalds 18521da177e4SLinus Torvalds if (raparm_cache) 18531da177e4SLinus Torvalds return 0; 18541da177e4SLinus Torvalds raparml = kmalloc(sizeof(struct raparms) * cache_size, GFP_KERNEL); 18551da177e4SLinus Torvalds 18561da177e4SLinus Torvalds if (raparml != NULL) { 18571da177e4SLinus Torvalds dprintk("nfsd: allocating %d readahead buffers.\n", 18581da177e4SLinus Torvalds cache_size); 18591da177e4SLinus Torvalds memset(raparml, 0, sizeof(struct raparms) * cache_size); 18601da177e4SLinus Torvalds for (i = 0; i < cache_size - 1; i++) { 18611da177e4SLinus Torvalds raparml[i].p_next = raparml + i + 1; 18621da177e4SLinus Torvalds } 18631da177e4SLinus Torvalds raparm_cache = raparml; 18641da177e4SLinus Torvalds } else { 18651da177e4SLinus Torvalds printk(KERN_WARNING 18661da177e4SLinus Torvalds "nfsd: Could not allocate memory read-ahead cache.\n"); 18671da177e4SLinus Torvalds return -ENOMEM; 18681da177e4SLinus Torvalds } 18691da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 18701da177e4SLinus Torvalds return 0; 18711da177e4SLinus Torvalds } 1872a257cdd0SAndreas Gruenbacher 1873a257cdd0SAndreas Gruenbacher #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 1874a257cdd0SAndreas Gruenbacher struct posix_acl * 1875a257cdd0SAndreas Gruenbacher nfsd_get_posix_acl(struct svc_fh *fhp, int type) 1876a257cdd0SAndreas Gruenbacher { 1877a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 1878a257cdd0SAndreas Gruenbacher char *name; 1879a257cdd0SAndreas Gruenbacher void *value = NULL; 1880a257cdd0SAndreas Gruenbacher ssize_t size; 1881a257cdd0SAndreas Gruenbacher struct posix_acl *acl; 1882a257cdd0SAndreas Gruenbacher 18835be196e5SChristoph Hellwig if (!IS_POSIXACL(inode)) 1884a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 18855be196e5SChristoph Hellwig 1886a257cdd0SAndreas Gruenbacher switch (type) { 1887a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 1888334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 1889a257cdd0SAndreas Gruenbacher break; 1890a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 1891334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 1892a257cdd0SAndreas Gruenbacher break; 1893a257cdd0SAndreas Gruenbacher default: 1894a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 1895a257cdd0SAndreas Gruenbacher } 1896a257cdd0SAndreas Gruenbacher 18975be196e5SChristoph Hellwig size = nfsd_getxattr(fhp->fh_dentry, name, &value); 18985be196e5SChristoph Hellwig if (size < 0) 18995be196e5SChristoph Hellwig return ERR_PTR(size); 1900a257cdd0SAndreas Gruenbacher 1901a257cdd0SAndreas Gruenbacher acl = posix_acl_from_xattr(value, size); 1902a257cdd0SAndreas Gruenbacher kfree(value); 1903a257cdd0SAndreas Gruenbacher return acl; 1904a257cdd0SAndreas Gruenbacher } 1905a257cdd0SAndreas Gruenbacher 1906a257cdd0SAndreas Gruenbacher int 1907a257cdd0SAndreas Gruenbacher nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) 1908a257cdd0SAndreas Gruenbacher { 1909a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 1910a257cdd0SAndreas Gruenbacher char *name; 1911a257cdd0SAndreas Gruenbacher void *value = NULL; 1912a257cdd0SAndreas Gruenbacher size_t size; 1913a257cdd0SAndreas Gruenbacher int error; 1914a257cdd0SAndreas Gruenbacher 1915a257cdd0SAndreas Gruenbacher if (!IS_POSIXACL(inode) || !inode->i_op || 1916a257cdd0SAndreas Gruenbacher !inode->i_op->setxattr || !inode->i_op->removexattr) 1917a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 1918a257cdd0SAndreas Gruenbacher switch(type) { 1919a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 1920334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 1921a257cdd0SAndreas Gruenbacher break; 1922a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 1923334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 1924a257cdd0SAndreas Gruenbacher break; 1925a257cdd0SAndreas Gruenbacher default: 1926a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 1927a257cdd0SAndreas Gruenbacher } 1928a257cdd0SAndreas Gruenbacher 1929a257cdd0SAndreas Gruenbacher if (acl && acl->a_count) { 1930334a13ecSChristoph Hellwig size = posix_acl_xattr_size(acl->a_count); 1931a257cdd0SAndreas Gruenbacher value = kmalloc(size, GFP_KERNEL); 1932a257cdd0SAndreas Gruenbacher if (!value) 1933a257cdd0SAndreas Gruenbacher return -ENOMEM; 1934a257cdd0SAndreas Gruenbacher size = posix_acl_to_xattr(acl, value, size); 1935a257cdd0SAndreas Gruenbacher if (size < 0) { 1936a257cdd0SAndreas Gruenbacher error = size; 1937a257cdd0SAndreas Gruenbacher goto getout; 1938a257cdd0SAndreas Gruenbacher } 1939a257cdd0SAndreas Gruenbacher } else 1940a257cdd0SAndreas Gruenbacher size = 0; 1941a257cdd0SAndreas Gruenbacher 1942a257cdd0SAndreas Gruenbacher if (size) 19435be196e5SChristoph Hellwig error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); 1944a257cdd0SAndreas Gruenbacher else { 1945a257cdd0SAndreas Gruenbacher if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) 1946a257cdd0SAndreas Gruenbacher error = 0; 1947a257cdd0SAndreas Gruenbacher else { 19485be196e5SChristoph Hellwig error = vfs_removexattr(fhp->fh_dentry, name); 1949a257cdd0SAndreas Gruenbacher if (error == -ENODATA) 1950a257cdd0SAndreas Gruenbacher error = 0; 1951a257cdd0SAndreas Gruenbacher } 1952a257cdd0SAndreas Gruenbacher } 1953a257cdd0SAndreas Gruenbacher 1954a257cdd0SAndreas Gruenbacher getout: 1955a257cdd0SAndreas Gruenbacher kfree(value); 1956a257cdd0SAndreas Gruenbacher return error; 1957a257cdd0SAndreas Gruenbacher } 1958a257cdd0SAndreas Gruenbacher #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ 1959