11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * File operations used by nfsd. Some of these have been ripped from 31da177e4SLinus Torvalds * other parts of the kernel because they weren't exported, others 41da177e4SLinus Torvalds * are partial duplicates with added or changed functionality. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Note that several functions dget() the dentry upon which they want 71da177e4SLinus Torvalds * to act, most notably those that create directory entries. Response 81da177e4SLinus Torvalds * dentry's are dput()'d if necessary in the release callback. 91da177e4SLinus Torvalds * So if you notice code paths that apparently fail to dput() the 101da177e4SLinus Torvalds * dentry, don't worry--they have been taken care of. 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> 131da177e4SLinus Torvalds * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> 141da177e4SLinus Torvalds */ 151da177e4SLinus Torvalds 161da177e4SLinus Torvalds #include <linux/fs.h> 171da177e4SLinus Torvalds #include <linux/file.h> 18d6b29d7cSJens Axboe #include <linux/splice.h> 191da177e4SLinus Torvalds #include <linux/fcntl.h> 201da177e4SLinus Torvalds #include <linux/namei.h> 211da177e4SLinus Torvalds #include <linux/delay.h> 220eeca283SRobert Love #include <linux/fsnotify.h> 231da177e4SLinus Torvalds #include <linux/posix_acl_xattr.h> 241da177e4SLinus Torvalds #include <linux/xattr.h> 259a74af21SBoaz Harrosh #include <linux/jhash.h> 269a74af21SBoaz Harrosh #include <linux/ima.h> 275a0e3ad6STejun Heo #include <linux/slab.h> 289a74af21SBoaz Harrosh #include <asm/uaccess.h> 29f501912aSBen Myers #include <linux/exportfs.h> 30f501912aSBen Myers #include <linux/writeback.h> 319a74af21SBoaz Harrosh 329a74af21SBoaz Harrosh #ifdef CONFIG_NFSD_V3 339a74af21SBoaz Harrosh #include "xdr3.h" 349a74af21SBoaz Harrosh #endif /* CONFIG_NFSD_V3 */ 359a74af21SBoaz Harrosh 365be196e5SChristoph Hellwig #ifdef CONFIG_NFSD_V4 372ca72e17SJ. Bruce Fields #include "acl.h" 382ca72e17SJ. Bruce Fields #include "idmap.h" 391da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V4 */ 401da177e4SLinus Torvalds 419a74af21SBoaz Harrosh #include "nfsd.h" 429a74af21SBoaz Harrosh #include "vfs.h" 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds #define NFSDDBG_FACILITY NFSDDBG_FILEOP 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds /* 481da177e4SLinus Torvalds * This is a cache of readahead params that help us choose the proper 491da177e4SLinus Torvalds * readahead strategy. Initially, we set all readahead parameters to 0 501da177e4SLinus Torvalds * and let the VFS handle things. 511da177e4SLinus Torvalds * If you increase the number of cached files very much, you'll need to 521da177e4SLinus Torvalds * add a hash table here. 531da177e4SLinus Torvalds */ 541da177e4SLinus Torvalds struct raparms { 551da177e4SLinus Torvalds struct raparms *p_next; 561da177e4SLinus Torvalds unsigned int p_count; 571da177e4SLinus Torvalds ino_t p_ino; 581da177e4SLinus Torvalds dev_t p_dev; 591da177e4SLinus Torvalds int p_set; 601da177e4SLinus Torvalds struct file_ra_state p_ra; 61fce1456aSGreg Banks unsigned int p_hindex; 621da177e4SLinus Torvalds }; 631da177e4SLinus Torvalds 64fce1456aSGreg Banks struct raparm_hbucket { 65fce1456aSGreg Banks struct raparms *pb_head; 66fce1456aSGreg Banks spinlock_t pb_lock; 67fce1456aSGreg Banks } ____cacheline_aligned_in_smp; 68fce1456aSGreg Banks 69fce1456aSGreg Banks #define RAPARM_HASH_BITS 4 70fce1456aSGreg Banks #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) 71fce1456aSGreg Banks #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) 72fce1456aSGreg Banks static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds /* 751da177e4SLinus Torvalds * Called from nfsd_lookup and encode_dirent. Check if we have crossed 761da177e4SLinus Torvalds * a mount point. 77e0bb89efSJ.Bruce Fields * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, 781da177e4SLinus Torvalds * or nfs_ok having possibly changed *dpp and *expp 791da177e4SLinus Torvalds */ 801da177e4SLinus Torvalds int 811da177e4SLinus Torvalds nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, 821da177e4SLinus Torvalds struct svc_export **expp) 831da177e4SLinus Torvalds { 841da177e4SLinus Torvalds struct svc_export *exp = *expp, *exp2 = NULL; 851da177e4SLinus Torvalds struct dentry *dentry = *dpp; 8691c9fa8fSAl Viro struct path path = {.mnt = mntget(exp->ex_path.mnt), 8791c9fa8fSAl Viro .dentry = dget(dentry)}; 886264d69dSAl Viro int err = 0; 891da177e4SLinus Torvalds 907cc90cc3SAl Viro err = follow_down(&path); 91cc53ce53SDavid Howells if (err < 0) 92cc53ce53SDavid Howells goto out; 931da177e4SLinus Torvalds 9491c9fa8fSAl Viro exp2 = rqst_exp_get_by_name(rqstp, &path); 951da177e4SLinus Torvalds if (IS_ERR(exp2)) { 961da177e4SLinus Torvalds err = PTR_ERR(exp2); 973b6cee7bSJ. Bruce Fields /* 983b6cee7bSJ. Bruce Fields * We normally allow NFS clients to continue 993b6cee7bSJ. Bruce Fields * "underneath" a mountpoint that is not exported. 1003b6cee7bSJ. Bruce Fields * The exception is V4ROOT, where no traversal is ever 1013b6cee7bSJ. Bruce Fields * allowed without an explicit export of the new 1023b6cee7bSJ. Bruce Fields * directory. 1033b6cee7bSJ. Bruce Fields */ 1043b6cee7bSJ. Bruce Fields if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) 1053b6cee7bSJ. Bruce Fields err = 0; 10691c9fa8fSAl Viro path_put(&path); 1071da177e4SLinus Torvalds goto out; 1081da177e4SLinus Torvalds } 1093c394ddaSSteve Dickson if (nfsd_v4client(rqstp) || 1103c394ddaSSteve Dickson (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { 1111da177e4SLinus Torvalds /* successfully crossed mount point */ 1121644ccc8SAl Viro /* 11391c9fa8fSAl Viro * This is subtle: path.dentry is *not* on path.mnt 11491c9fa8fSAl Viro * at this point. The only reason we are safe is that 11591c9fa8fSAl Viro * original mnt is pinned down by exp, so we should 11691c9fa8fSAl Viro * put path *before* putting exp 1171644ccc8SAl Viro */ 11891c9fa8fSAl Viro *dpp = path.dentry; 11991c9fa8fSAl Viro path.dentry = dentry; 1201644ccc8SAl Viro *expp = exp2; 12191c9fa8fSAl Viro exp2 = exp; 1221da177e4SLinus Torvalds } 12391c9fa8fSAl Viro path_put(&path); 12491c9fa8fSAl Viro exp_put(exp2); 1251da177e4SLinus Torvalds out: 1261da177e4SLinus Torvalds return err; 1271da177e4SLinus Torvalds } 1281da177e4SLinus Torvalds 129289ede45SJ. Bruce Fields static void follow_to_parent(struct path *path) 130289ede45SJ. Bruce Fields { 131289ede45SJ. Bruce Fields struct dentry *dp; 132289ede45SJ. Bruce Fields 133289ede45SJ. Bruce Fields while (path->dentry == path->mnt->mnt_root && follow_up(path)) 134289ede45SJ. Bruce Fields ; 135289ede45SJ. Bruce Fields dp = dget_parent(path->dentry); 136289ede45SJ. Bruce Fields dput(path->dentry); 137289ede45SJ. Bruce Fields path->dentry = dp; 138289ede45SJ. Bruce Fields } 139289ede45SJ. Bruce Fields 140289ede45SJ. Bruce Fields static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) 141289ede45SJ. Bruce Fields { 142289ede45SJ. Bruce Fields struct svc_export *exp2; 143289ede45SJ. Bruce Fields struct path path = {.mnt = mntget((*exp)->ex_path.mnt), 144289ede45SJ. Bruce Fields .dentry = dget(dparent)}; 145289ede45SJ. Bruce Fields 146289ede45SJ. Bruce Fields follow_to_parent(&path); 147289ede45SJ. Bruce Fields 148289ede45SJ. Bruce Fields exp2 = rqst_exp_parent(rqstp, &path); 149289ede45SJ. Bruce Fields if (PTR_ERR(exp2) == -ENOENT) { 150289ede45SJ. Bruce Fields *dentryp = dget(dparent); 151289ede45SJ. Bruce Fields } else if (IS_ERR(exp2)) { 152289ede45SJ. Bruce Fields path_put(&path); 153289ede45SJ. Bruce Fields return PTR_ERR(exp2); 154289ede45SJ. Bruce Fields } else { 155289ede45SJ. Bruce Fields *dentryp = dget(path.dentry); 156289ede45SJ. Bruce Fields exp_put(*exp); 157289ede45SJ. Bruce Fields *exp = exp2; 158289ede45SJ. Bruce Fields } 159289ede45SJ. Bruce Fields path_put(&path); 160289ede45SJ. Bruce Fields return 0; 161289ede45SJ. Bruce Fields } 162289ede45SJ. Bruce Fields 16382ead7feSJ. Bruce Fields /* 16482ead7feSJ. Bruce Fields * For nfsd purposes, we treat V4ROOT exports as though there was an 16582ead7feSJ. Bruce Fields * export at *every* directory. 16682ead7feSJ. Bruce Fields */ 1673227fa41SJ. Bruce Fields int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) 16882ead7feSJ. Bruce Fields { 16982ead7feSJ. Bruce Fields if (d_mountpoint(dentry)) 17082ead7feSJ. Bruce Fields return 1; 17182ead7feSJ. Bruce Fields if (!(exp->ex_flags & NFSEXP_V4ROOT)) 17282ead7feSJ. Bruce Fields return 0; 17382ead7feSJ. Bruce Fields return dentry->d_inode != NULL; 17482ead7feSJ. Bruce Fields } 17582ead7feSJ. Bruce Fields 1766264d69dSAl Viro __be32 1776c0a654dSJ. Bruce Fields nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, 1785a022fc8SChuck Lever const char *name, unsigned int len, 1796c0a654dSJ. Bruce Fields struct svc_export **exp_ret, struct dentry **dentry_ret) 1801da177e4SLinus Torvalds { 1811da177e4SLinus Torvalds struct svc_export *exp; 1821da177e4SLinus Torvalds struct dentry *dparent; 1831da177e4SLinus Torvalds struct dentry *dentry; 1846264d69dSAl Viro int host_err; 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds dparent = fhp->fh_dentry; 1891da177e4SLinus Torvalds exp = fhp->fh_export; 1901da177e4SLinus Torvalds exp_get(exp); 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds /* Lookup the name, but don't follow links */ 1931da177e4SLinus Torvalds if (isdotent(name, len)) { 1941da177e4SLinus Torvalds if (len==1) 1951da177e4SLinus Torvalds dentry = dget(dparent); 19654775491SJan Blunck else if (dparent != exp->ex_path.dentry) 1971da177e4SLinus Torvalds dentry = dget_parent(dparent); 198fed83811SJ. Bruce Fields else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) 1991da177e4SLinus Torvalds dentry = dget(dparent); /* .. == . just like at / */ 2001da177e4SLinus Torvalds else { 2011da177e4SLinus Torvalds /* checking mountpoint crossing is very different when stepping up */ 202289ede45SJ. Bruce Fields host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); 203289ede45SJ. Bruce Fields if (host_err) 2041da177e4SLinus Torvalds goto out_nfserr; 2051da177e4SLinus Torvalds } 2061da177e4SLinus Torvalds } else { 2071da177e4SLinus Torvalds fh_lock(fhp); 2081da177e4SLinus Torvalds dentry = lookup_one_len(name, dparent, len); 2096264d69dSAl Viro host_err = PTR_ERR(dentry); 2101da177e4SLinus Torvalds if (IS_ERR(dentry)) 2111da177e4SLinus Torvalds goto out_nfserr; 2121da177e4SLinus Torvalds /* 2131da177e4SLinus Torvalds * check if we have crossed a mount point ... 2141da177e4SLinus Torvalds */ 21582ead7feSJ. Bruce Fields if (nfsd_mountpoint(dentry, exp)) { 2166264d69dSAl Viro if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 2171da177e4SLinus Torvalds dput(dentry); 2181da177e4SLinus Torvalds goto out_nfserr; 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds } 2211da177e4SLinus Torvalds } 2226c0a654dSJ. Bruce Fields *dentry_ret = dentry; 2236c0a654dSJ. Bruce Fields *exp_ret = exp; 2246c0a654dSJ. Bruce Fields return 0; 2256c0a654dSJ. Bruce Fields 2266c0a654dSJ. Bruce Fields out_nfserr: 2276c0a654dSJ. Bruce Fields exp_put(exp); 2286c0a654dSJ. Bruce Fields return nfserrno(host_err); 2296c0a654dSJ. Bruce Fields } 2306c0a654dSJ. Bruce Fields 2316c0a654dSJ. Bruce Fields /* 2326c0a654dSJ. Bruce Fields * Look up one component of a pathname. 2336c0a654dSJ. Bruce Fields * N.B. After this call _both_ fhp and resfh need an fh_put 2346c0a654dSJ. Bruce Fields * 2356c0a654dSJ. Bruce Fields * If the lookup would cross a mountpoint, and the mounted filesystem 2366c0a654dSJ. Bruce Fields * is exported to the client with NFSEXP_NOHIDE, then the lookup is 2376c0a654dSJ. Bruce Fields * accepted as it stands and the mounted directory is 2386c0a654dSJ. Bruce Fields * returned. Otherwise the covered directory is returned. 2396c0a654dSJ. Bruce Fields * NOTE: this mountpoint crossing is not supported properly by all 2406c0a654dSJ. Bruce Fields * clients and is explicitly disallowed for NFSv3 2416c0a654dSJ. Bruce Fields * NeilBrown <neilb@cse.unsw.edu.au> 2426c0a654dSJ. Bruce Fields */ 2436c0a654dSJ. Bruce Fields __be32 2446c0a654dSJ. Bruce Fields nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 2455a022fc8SChuck Lever unsigned int len, struct svc_fh *resfh) 2466c0a654dSJ. Bruce Fields { 2476c0a654dSJ. Bruce Fields struct svc_export *exp; 2486c0a654dSJ. Bruce Fields struct dentry *dentry; 2496c0a654dSJ. Bruce Fields __be32 err; 2506c0a654dSJ. Bruce Fields 25129a78a3eSJ. Bruce Fields err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 25229a78a3eSJ. Bruce Fields if (err) 25329a78a3eSJ. Bruce Fields return err; 2546c0a654dSJ. Bruce Fields err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); 2556c0a654dSJ. Bruce Fields if (err) 2566c0a654dSJ. Bruce Fields return err; 25732c1eb0cSAndy Adamson err = check_nfsd_access(exp, rqstp); 25832c1eb0cSAndy Adamson if (err) 25932c1eb0cSAndy Adamson goto out; 2601da177e4SLinus Torvalds /* 2611da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2621da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2631da177e4SLinus Torvalds */ 2641da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2651da177e4SLinus Torvalds if (!err && !dentry->d_inode) 2661da177e4SLinus Torvalds err = nfserr_noent; 26732c1eb0cSAndy Adamson out: 2681da177e4SLinus Torvalds dput(dentry); 2691da177e4SLinus Torvalds exp_put(exp); 2701da177e4SLinus Torvalds return err; 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds 2734795bb37SJ. Bruce Fields static int nfsd_break_lease(struct inode *inode) 2744795bb37SJ. Bruce Fields { 2754795bb37SJ. Bruce Fields if (!S_ISREG(inode->i_mode)) 2764795bb37SJ. Bruce Fields return 0; 2774795bb37SJ. Bruce Fields return break_lease(inode, O_WRONLY | O_NONBLOCK); 2784795bb37SJ. Bruce Fields } 2794795bb37SJ. Bruce Fields 280f501912aSBen Myers /* 281f501912aSBen Myers * Commit metadata changes to stable storage. 282f501912aSBen Myers */ 283f501912aSBen Myers static int 284f501912aSBen Myers commit_metadata(struct svc_fh *fhp) 285f501912aSBen Myers { 286f501912aSBen Myers struct inode *inode = fhp->fh_dentry->d_inode; 287f501912aSBen Myers const struct export_operations *export_ops = inode->i_sb->s_export_op; 288f501912aSBen Myers 289f501912aSBen Myers if (!EX_ISSYNC(fhp->fh_export)) 290f501912aSBen Myers return 0; 291f501912aSBen Myers 292c3765016SChristoph Hellwig if (export_ops->commit_metadata) 293c3765016SChristoph Hellwig return export_ops->commit_metadata(inode); 294c3765016SChristoph Hellwig return sync_inode_metadata(inode, 1); 295f501912aSBen Myers } 2966c0a654dSJ. Bruce Fields 2971da177e4SLinus Torvalds /* 2981da177e4SLinus Torvalds * Set various file attributes. 2991da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 3001da177e4SLinus Torvalds */ 3016264d69dSAl Viro __be32 3021da177e4SLinus Torvalds nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 3031da177e4SLinus Torvalds int check_guard, time_t guardtime) 3041da177e4SLinus Torvalds { 3051da177e4SLinus Torvalds struct dentry *dentry; 3061da177e4SLinus Torvalds struct inode *inode; 3078837abcaSMiklos Szeredi int accmode = NFSD_MAY_SATTR; 3081da177e4SLinus Torvalds int ftype = 0; 3096264d69dSAl Viro __be32 err; 3106264d69dSAl Viro int host_err; 3111da177e4SLinus Torvalds int size_change = 0; 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) 3148837abcaSMiklos Szeredi accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; 3151da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) 3161da177e4SLinus Torvalds ftype = S_IFREG; 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds /* Get inode */ 3191da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 32015b7a1b8SNeilBrown if (err) 3211da177e4SLinus Torvalds goto out; 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds dentry = fhp->fh_dentry; 3241da177e4SLinus Torvalds inode = dentry->d_inode; 3251da177e4SLinus Torvalds 32615b7a1b8SNeilBrown /* Ignore any mode updates on symlinks */ 32715b7a1b8SNeilBrown if (S_ISLNK(inode->i_mode)) 32815b7a1b8SNeilBrown iap->ia_valid &= ~ATTR_MODE; 32915b7a1b8SNeilBrown 33015b7a1b8SNeilBrown if (!iap->ia_valid) 33115b7a1b8SNeilBrown goto out; 33215b7a1b8SNeilBrown 3339c85fca5SChristoph Hellwig /* 3349c85fca5SChristoph Hellwig * NFSv2 does not differentiate between "set-[ac]time-to-now" 3351da177e4SLinus Torvalds * which only requires access, and "set-[ac]time-to-X" which 3361da177e4SLinus Torvalds * requires ownership. 3371da177e4SLinus Torvalds * So if it looks like it might be "set both to the same time which 3381da177e4SLinus Torvalds * is close to now", and if inode_change_ok fails, then we 3391da177e4SLinus Torvalds * convert to "set to now" instead of "set to explicit time" 3401da177e4SLinus Torvalds * 3411da177e4SLinus Torvalds * We only call inode_change_ok as the last test as technically 3421da177e4SLinus Torvalds * it is not an interface that we should be using. It is only 3431da177e4SLinus Torvalds * valid if the filesystem does not define it's own i_op->setattr. 3441da177e4SLinus Torvalds */ 3451da177e4SLinus Torvalds #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) 3461da177e4SLinus Torvalds #define MAX_TOUCH_TIME_ERROR (30*60) 3479c85fca5SChristoph Hellwig if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && 3489c85fca5SChristoph Hellwig iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { 3499c85fca5SChristoph Hellwig /* 3509c85fca5SChristoph Hellwig * Looks probable. 3519c85fca5SChristoph Hellwig * 3529c85fca5SChristoph Hellwig * Now just make sure time is in the right ballpark. 3539c85fca5SChristoph Hellwig * Solaris, at least, doesn't seem to care what the time 3549c85fca5SChristoph Hellwig * request is. We require it be within 30 minutes of now. 3551da177e4SLinus Torvalds */ 3561da177e4SLinus Torvalds time_t delta = iap->ia_atime.tv_sec - get_seconds(); 3579c85fca5SChristoph Hellwig if (delta < 0) 3589c85fca5SChristoph Hellwig delta = -delta; 3591da177e4SLinus Torvalds if (delta < MAX_TOUCH_TIME_ERROR && 3601da177e4SLinus Torvalds inode_change_ok(inode, iap) != 0) { 3619c85fca5SChristoph Hellwig /* 3629c85fca5SChristoph Hellwig * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. 3639c85fca5SChristoph Hellwig * This will cause notify_change to set these times 3649c85fca5SChristoph Hellwig * to "now" 3651da177e4SLinus Torvalds */ 3661da177e4SLinus Torvalds iap->ia_valid &= ~BOTH_TIME_SET; 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds } 3691da177e4SLinus Torvalds 3709c85fca5SChristoph Hellwig /* 3719c85fca5SChristoph Hellwig * The size case is special. 3729c85fca5SChristoph Hellwig * It changes the file as well as the attributes. 3739c85fca5SChristoph Hellwig */ 3741da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) { 3751da177e4SLinus Torvalds if (iap->ia_size < inode->i_size) { 3768837abcaSMiklos Szeredi err = nfsd_permission(rqstp, fhp->fh_export, dentry, 3778837abcaSMiklos Szeredi NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE); 3781da177e4SLinus Torvalds if (err) 3791da177e4SLinus Torvalds goto out; 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds 3826264d69dSAl Viro host_err = get_write_access(inode); 3836264d69dSAl Viro if (host_err) 3841da177e4SLinus Torvalds goto out_nfserr; 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds size_change = 1; 3876264d69dSAl Viro host_err = locks_verify_truncate(inode, NULL, iap->ia_size); 3886264d69dSAl Viro if (host_err) { 3891da177e4SLinus Torvalds put_write_access(inode); 3901da177e4SLinus Torvalds goto out_nfserr; 3911da177e4SLinus Torvalds } 3921da177e4SLinus Torvalds } 3931da177e4SLinus Torvalds 394ca456252SJeff Layton /* sanitize the mode change */ 3951da177e4SLinus Torvalds if (iap->ia_valid & ATTR_MODE) { 3961da177e4SLinus Torvalds iap->ia_mode &= S_IALLUGO; 397dee3209dSJeff Layton iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); 3981da177e4SLinus Torvalds } 399ca456252SJeff Layton 400ca456252SJeff Layton /* Revoke setuid/setgid on chown */ 4010953e620SSachin S. Prabhu if (!S_ISDIR(inode->i_mode) && 4020953e620SSachin S. Prabhu (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) || 4030953e620SSachin S. Prabhu ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) { 404ca456252SJeff Layton iap->ia_valid |= ATTR_KILL_PRIV; 405ca456252SJeff Layton if (iap->ia_valid & ATTR_MODE) { 406ca456252SJeff Layton /* we're setting mode too, just clear the s*id bits */ 407ca456252SJeff Layton iap->ia_mode &= ~S_ISUID; 408ca456252SJeff Layton if (iap->ia_mode & S_IXGRP) 4098a0ce7d9SJeff Layton iap->ia_mode &= ~S_ISGID; 4108a0ce7d9SJeff Layton } else { 411ca456252SJeff Layton /* set ATTR_KILL_* bits and let VFS handle it */ 412ca456252SJeff Layton iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); 413ca456252SJeff Layton } 4148a0ce7d9SJeff Layton } 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds /* Change the attributes. */ 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds err = nfserr_notsync; 4211da177e4SLinus Torvalds if (!check_guard || guardtime == inode->i_ctime.tv_sec) { 4224795bb37SJ. Bruce Fields host_err = nfsd_break_lease(inode); 4236a76bebeSJ. Bruce Fields if (host_err) 4246a76bebeSJ. Bruce Fields goto out_nfserr; 4251da177e4SLinus Torvalds fh_lock(fhp); 4266a76bebeSJ. Bruce Fields 4276264d69dSAl Viro host_err = notify_change(dentry, iap); 4286264d69dSAl Viro err = nfserrno(host_err); 4291da177e4SLinus Torvalds fh_unlock(fhp); 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds if (size_change) 4321da177e4SLinus Torvalds put_write_access(inode); 4331da177e4SLinus Torvalds if (!err) 434b160fdabSChristoph Hellwig commit_metadata(fhp); 4351da177e4SLinus Torvalds out: 4361da177e4SLinus Torvalds return err; 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds out_nfserr: 4396264d69dSAl Viro err = nfserrno(host_err); 4401da177e4SLinus Torvalds goto out; 4411da177e4SLinus Torvalds } 4421da177e4SLinus Torvalds 4435be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V2_ACL) || \ 4445be196e5SChristoph Hellwig defined(CONFIG_NFSD_V3_ACL) || \ 4455be196e5SChristoph Hellwig defined(CONFIG_NFSD_V4) 4465be196e5SChristoph Hellwig static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) 4475be196e5SChristoph Hellwig { 4485be196e5SChristoph Hellwig ssize_t buflen; 4496c6a426fSKrishna Kumar ssize_t ret; 4501da177e4SLinus Torvalds 4515be196e5SChristoph Hellwig buflen = vfs_getxattr(dentry, key, NULL, 0); 4525be196e5SChristoph Hellwig if (buflen <= 0) 4535be196e5SChristoph Hellwig return buflen; 4545be196e5SChristoph Hellwig 4555be196e5SChristoph Hellwig *buf = kmalloc(buflen, GFP_KERNEL); 4565be196e5SChristoph Hellwig if (!*buf) 4575be196e5SChristoph Hellwig return -ENOMEM; 4585be196e5SChristoph Hellwig 4596c6a426fSKrishna Kumar ret = vfs_getxattr(dentry, key, *buf, buflen); 4606c6a426fSKrishna Kumar if (ret < 0) 4616c6a426fSKrishna Kumar kfree(*buf); 4626c6a426fSKrishna Kumar return ret; 4635be196e5SChristoph Hellwig } 4645be196e5SChristoph Hellwig #endif 4655be196e5SChristoph Hellwig 4665be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V4) 4671da177e4SLinus Torvalds static int 4681da177e4SLinus Torvalds set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) 4691da177e4SLinus Torvalds { 4701da177e4SLinus Torvalds int len; 4711da177e4SLinus Torvalds size_t buflen; 4721da177e4SLinus Torvalds char *buf = NULL; 4731da177e4SLinus Torvalds int error = 0; 4741da177e4SLinus Torvalds 4751da177e4SLinus Torvalds buflen = posix_acl_xattr_size(pacl->a_count); 4761da177e4SLinus Torvalds buf = kmalloc(buflen, GFP_KERNEL); 4771da177e4SLinus Torvalds error = -ENOMEM; 4781da177e4SLinus Torvalds if (buf == NULL) 4791da177e4SLinus Torvalds goto out; 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds len = posix_acl_to_xattr(pacl, buf, buflen); 4821da177e4SLinus Torvalds if (len < 0) { 4831da177e4SLinus Torvalds error = len; 4841da177e4SLinus Torvalds goto out; 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds 4875be196e5SChristoph Hellwig error = vfs_setxattr(dentry, key, buf, len, 0); 4881da177e4SLinus Torvalds out: 4891da177e4SLinus Torvalds kfree(buf); 4901da177e4SLinus Torvalds return error; 4911da177e4SLinus Torvalds } 4921da177e4SLinus Torvalds 4936264d69dSAl Viro __be32 4941da177e4SLinus Torvalds nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, 4951da177e4SLinus Torvalds struct nfs4_acl *acl) 4961da177e4SLinus Torvalds { 4976264d69dSAl Viro __be32 error; 4986264d69dSAl Viro int host_error; 4991da177e4SLinus Torvalds struct dentry *dentry; 5001da177e4SLinus Torvalds struct inode *inode; 5011da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 5021da177e4SLinus Torvalds unsigned int flags = 0; 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds /* Get inode */ 5058837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); 5061da177e4SLinus Torvalds if (error) 5074b2ca38aSJ. Bruce Fields return error; 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds dentry = fhp->fh_dentry; 5101da177e4SLinus Torvalds inode = dentry->d_inode; 5111da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) 5121da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5131da177e4SLinus Torvalds 5146264d69dSAl Viro host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); 5156264d69dSAl Viro if (host_error == -EINVAL) { 5164b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 5176264d69dSAl Viro } else if (host_error < 0) 5181da177e4SLinus Torvalds goto out_nfserr; 5191da177e4SLinus Torvalds 5206264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); 5216264d69dSAl Viro if (host_error < 0) 5224b2ca38aSJ. Bruce Fields goto out_release; 5231da177e4SLinus Torvalds 5244b2ca38aSJ. Bruce Fields if (S_ISDIR(inode->i_mode)) 5256264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); 5261da177e4SLinus Torvalds 5274b2ca38aSJ. Bruce Fields out_release: 5281da177e4SLinus Torvalds posix_acl_release(pacl); 5291da177e4SLinus Torvalds posix_acl_release(dpacl); 5301da177e4SLinus Torvalds out_nfserr: 531f34f9242SJ. Bruce Fields if (host_error == -EOPNOTSUPP) 5324b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 533f34f9242SJ. Bruce Fields else 5344b2ca38aSJ. Bruce Fields return nfserrno(host_error); 5351da177e4SLinus Torvalds } 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds static struct posix_acl * 5381da177e4SLinus Torvalds _get_posix_acl(struct dentry *dentry, char *key) 5391da177e4SLinus Torvalds { 5405be196e5SChristoph Hellwig void *buf = NULL; 5411da177e4SLinus Torvalds struct posix_acl *pacl = NULL; 5425be196e5SChristoph Hellwig int buflen; 5431da177e4SLinus Torvalds 5445be196e5SChristoph Hellwig buflen = nfsd_getxattr(dentry, key, &buf); 5455be196e5SChristoph Hellwig if (!buflen) 5465be196e5SChristoph Hellwig buflen = -ENODATA; 5475be196e5SChristoph Hellwig if (buflen <= 0) 5485be196e5SChristoph Hellwig return ERR_PTR(buflen); 5491da177e4SLinus Torvalds 5501da177e4SLinus Torvalds pacl = posix_acl_from_xattr(buf, buflen); 5511da177e4SLinus Torvalds kfree(buf); 5521da177e4SLinus Torvalds return pacl; 5531da177e4SLinus Torvalds } 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds int 5561da177e4SLinus Torvalds nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) 5571da177e4SLinus Torvalds { 5581da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 5591da177e4SLinus Torvalds int error = 0; 5601da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 5611da177e4SLinus Torvalds unsigned int flags = 0; 5621da177e4SLinus Torvalds 5639a59f452SChristoph Hellwig pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); 5641da177e4SLinus Torvalds if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) 5651da177e4SLinus Torvalds pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 5661da177e4SLinus Torvalds if (IS_ERR(pacl)) { 5671da177e4SLinus Torvalds error = PTR_ERR(pacl); 5681da177e4SLinus Torvalds pacl = NULL; 5691da177e4SLinus Torvalds goto out; 5701da177e4SLinus Torvalds } 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) { 5739a59f452SChristoph Hellwig dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); 5741da177e4SLinus Torvalds if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) 5751da177e4SLinus Torvalds dpacl = NULL; 5761da177e4SLinus Torvalds else if (IS_ERR(dpacl)) { 5771da177e4SLinus Torvalds error = PTR_ERR(dpacl); 5781da177e4SLinus Torvalds dpacl = NULL; 5791da177e4SLinus Torvalds goto out; 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5821da177e4SLinus Torvalds } 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); 5851da177e4SLinus Torvalds if (IS_ERR(*acl)) { 5861da177e4SLinus Torvalds error = PTR_ERR(*acl); 5871da177e4SLinus Torvalds *acl = NULL; 5881da177e4SLinus Torvalds } 5891da177e4SLinus Torvalds out: 5901da177e4SLinus Torvalds posix_acl_release(pacl); 5911da177e4SLinus Torvalds posix_acl_release(dpacl); 5921da177e4SLinus Torvalds return error; 5931da177e4SLinus Torvalds } 5941da177e4SLinus Torvalds 5956a85d6c7SJ. Bruce Fields #endif /* defined(CONFIG_NFSD_V4) */ 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 5981da177e4SLinus Torvalds /* 5991da177e4SLinus Torvalds * Check server access rights to a file system object 6001da177e4SLinus Torvalds */ 6011da177e4SLinus Torvalds struct accessmap { 6021da177e4SLinus Torvalds u32 access; 6031da177e4SLinus Torvalds int how; 6041da177e4SLinus Torvalds }; 6051da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 6068837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6078837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6088837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, 6098837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, 6101da177e4SLinus Torvalds 6111da177e4SLinus Torvalds { 0, 0 } 6121da177e4SLinus Torvalds }; 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 6158837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6168837abcaSMiklos Szeredi { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, 6178837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, 6188837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, 6198837abcaSMiklos Szeredi { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds { 0, 0 } 6221da177e4SLinus Torvalds }; 6231da177e4SLinus Torvalds 6241da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 6251da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 6261da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 6271da177e4SLinus Torvalds * (which really, the server doesn't care about). So 6281da177e4SLinus Torvalds * We provide simple access checking for them, looking 6291da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 6301da177e4SLinus Torvalds * filesystem checks 6311da177e4SLinus Torvalds */ 6328837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6338837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6348837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6358837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds { 0, 0 } 6381da177e4SLinus Torvalds }; 6391da177e4SLinus Torvalds 6406264d69dSAl Viro __be32 6411da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 6421da177e4SLinus Torvalds { 6431da177e4SLinus Torvalds struct accessmap *map; 6441da177e4SLinus Torvalds struct svc_export *export; 6451da177e4SLinus Torvalds struct dentry *dentry; 6461da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 6476264d69dSAl Viro __be32 error; 6481da177e4SLinus Torvalds 6498837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 6501da177e4SLinus Torvalds if (error) 6511da177e4SLinus Torvalds goto out; 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds export = fhp->fh_export; 6541da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6551da177e4SLinus Torvalds 6561da177e4SLinus Torvalds if (S_ISREG(dentry->d_inode->i_mode)) 6571da177e4SLinus Torvalds map = nfs3_regaccess; 6581da177e4SLinus Torvalds else if (S_ISDIR(dentry->d_inode->i_mode)) 6591da177e4SLinus Torvalds map = nfs3_diraccess; 6601da177e4SLinus Torvalds else 6611da177e4SLinus Torvalds map = nfs3_anyaccess; 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds 6641da177e4SLinus Torvalds query = *access; 6651da177e4SLinus Torvalds for (; map->access; map++) { 6661da177e4SLinus Torvalds if (map->access & query) { 6676264d69dSAl Viro __be32 err2; 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds sresult |= map->access; 6701da177e4SLinus Torvalds 6710ec757dfSJ. Bruce Fields err2 = nfsd_permission(rqstp, export, dentry, map->how); 6721da177e4SLinus Torvalds switch (err2) { 6731da177e4SLinus Torvalds case nfs_ok: 6741da177e4SLinus Torvalds result |= map->access; 6751da177e4SLinus Torvalds break; 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 6781da177e4SLinus Torvalds * rather than an error occurred */ 6791da177e4SLinus Torvalds case nfserr_rofs: 6801da177e4SLinus Torvalds case nfserr_acces: 6811da177e4SLinus Torvalds case nfserr_perm: 6821da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 6831da177e4SLinus Torvalds break; 6841da177e4SLinus Torvalds default: 6851da177e4SLinus Torvalds error = err2; 6861da177e4SLinus Torvalds goto out; 6871da177e4SLinus Torvalds } 6881da177e4SLinus Torvalds } 6891da177e4SLinus Torvalds } 6901da177e4SLinus Torvalds *access = result; 6911da177e4SLinus Torvalds if (supported) 6921da177e4SLinus Torvalds *supported = sresult; 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds out: 6951da177e4SLinus Torvalds return error; 6961da177e4SLinus Torvalds } 6971da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds 7011da177e4SLinus Torvalds /* 7021da177e4SLinus Torvalds * Open an existing file or directory. 7031da177e4SLinus Torvalds * The access argument indicates the type of open (read/write/lock) 7041da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 7051da177e4SLinus Torvalds */ 7066264d69dSAl Viro __be32 7071da177e4SLinus Torvalds nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 7081da177e4SLinus Torvalds int access, struct file **filp) 7091da177e4SLinus Torvalds { 7101da177e4SLinus Torvalds struct dentry *dentry; 7111da177e4SLinus Torvalds struct inode *inode; 7126264d69dSAl Viro int flags = O_RDONLY|O_LARGEFILE; 7136264d69dSAl Viro __be32 err; 71491885258SJeff Layton int host_err = 0; 7151da177e4SLinus Torvalds 716e0e81739SDavid Howells validate_process_creds(); 717e0e81739SDavid Howells 7181da177e4SLinus Torvalds /* 7191da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 7201da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 7211da177e4SLinus Torvalds * in case a chmod has now revoked permission. 7221da177e4SLinus Torvalds */ 7238837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE); 7241da177e4SLinus Torvalds if (err) 7251da177e4SLinus Torvalds goto out; 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds dentry = fhp->fh_dentry; 7281da177e4SLinus Torvalds inode = dentry->d_inode; 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 7311da177e4SLinus Torvalds * or any access when mandatory locking enabled 7321da177e4SLinus Torvalds */ 7331da177e4SLinus Torvalds err = nfserr_perm; 7348837abcaSMiklos Szeredi if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE)) 7351da177e4SLinus Torvalds goto out; 7365e7fc436SJ. Bruce Fields /* 7375e7fc436SJ. Bruce Fields * We must ignore files (but only files) which might have mandatory 7385e7fc436SJ. Bruce Fields * locks on them because there is no way to know if the accesser has 7395e7fc436SJ. Bruce Fields * the lock. 7405e7fc436SJ. Bruce Fields */ 7415e7fc436SJ. Bruce Fields if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) 7421da177e4SLinus Torvalds goto out; 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds if (!inode->i_fop) 7451da177e4SLinus Torvalds goto out; 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds /* 7481da177e4SLinus Torvalds * Check to see if there are any leases on this file. 7491da177e4SLinus Torvalds * This may block while leases are broken. 7501da177e4SLinus Torvalds */ 75191885258SJeff Layton if (!(access & NFSD_MAY_NOT_BREAK_LEASE)) 7528737c930SAl Viro host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? O_WRONLY : 0)); 7536264d69dSAl Viro if (host_err) /* NOMEM or WOULDBLOCK */ 7541da177e4SLinus Torvalds goto out_nfserr; 7551da177e4SLinus Torvalds 7568837abcaSMiklos Szeredi if (access & NFSD_MAY_WRITE) { 7578837abcaSMiklos Szeredi if (access & NFSD_MAY_READ) 7589ecb6a08SJ. Bruce Fields flags = O_RDWR|O_LARGEFILE; 7599ecb6a08SJ. Bruce Fields else 7601da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 7611da177e4SLinus Torvalds } 76254775491SJan Blunck *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt), 763033a666cSDavid Howells flags, current_cred()); 7641da177e4SLinus Torvalds if (IS_ERR(*filp)) 7656264d69dSAl Viro host_err = PTR_ERR(*filp); 766aeaa5ccdSChuck Ebbert else 7679bbb6cadSMimi Zohar host_err = ima_file_check(*filp, access); 7681da177e4SLinus Torvalds out_nfserr: 7696264d69dSAl Viro err = nfserrno(host_err); 7701da177e4SLinus Torvalds out: 771e0e81739SDavid Howells validate_process_creds(); 7721da177e4SLinus Torvalds return err; 7731da177e4SLinus Torvalds } 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds /* 7761da177e4SLinus Torvalds * Close a file. 7771da177e4SLinus Torvalds */ 7781da177e4SLinus Torvalds void 7791da177e4SLinus Torvalds nfsd_close(struct file *filp) 7801da177e4SLinus Torvalds { 7811da177e4SLinus Torvalds fput(filp); 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds 7849a8d248eSJ. Bruce Fields /* 7851da177e4SLinus Torvalds * Obtain the readahead parameters for the file 7861da177e4SLinus Torvalds * specified by (dev, ino). 7871da177e4SLinus Torvalds */ 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvalds static inline struct raparms * 7901da177e4SLinus Torvalds nfsd_get_raparms(dev_t dev, ino_t ino) 7911da177e4SLinus Torvalds { 7921da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 7931da177e4SLinus Torvalds int depth = 0; 794fce1456aSGreg Banks unsigned int hash; 795fce1456aSGreg Banks struct raparm_hbucket *rab; 7961da177e4SLinus Torvalds 797fce1456aSGreg Banks hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; 798fce1456aSGreg Banks rab = &raparm_hash[hash]; 799fce1456aSGreg Banks 800fce1456aSGreg Banks spin_lock(&rab->pb_lock); 801fce1456aSGreg Banks for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { 8021da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 8031da177e4SLinus Torvalds goto found; 8041da177e4SLinus Torvalds depth++; 8051da177e4SLinus Torvalds if (ra->p_count == 0) 8061da177e4SLinus Torvalds frap = rap; 8071da177e4SLinus Torvalds } 8083aa6e0aaSKonstantin Khorenko depth = nfsdstats.ra_size; 8091da177e4SLinus Torvalds if (!frap) { 810fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8111da177e4SLinus Torvalds return NULL; 8121da177e4SLinus Torvalds } 8131da177e4SLinus Torvalds rap = frap; 8141da177e4SLinus Torvalds ra = *frap; 8151da177e4SLinus Torvalds ra->p_dev = dev; 8161da177e4SLinus Torvalds ra->p_ino = ino; 8171da177e4SLinus Torvalds ra->p_set = 0; 818fce1456aSGreg Banks ra->p_hindex = hash; 8191da177e4SLinus Torvalds found: 820fce1456aSGreg Banks if (rap != &rab->pb_head) { 8211da177e4SLinus Torvalds *rap = ra->p_next; 822fce1456aSGreg Banks ra->p_next = rab->pb_head; 823fce1456aSGreg Banks rab->pb_head = ra; 8241da177e4SLinus Torvalds } 8251da177e4SLinus Torvalds ra->p_count++; 8261da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 827fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8281da177e4SLinus Torvalds return ra; 8291da177e4SLinus Torvalds } 8301da177e4SLinus Torvalds 8311da177e4SLinus Torvalds /* 832cf8208d0SJens Axboe * Grab and keep cached pages associated with a file in the svc_rqst 833cf8208d0SJens Axboe * so that they can be passed to the network sendmsg/sendpage routines 834cf8208d0SJens Axboe * directly. They will be released after the sending has completed. 8351da177e4SLinus Torvalds */ 8361da177e4SLinus Torvalds static int 837cf8208d0SJens Axboe nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, 838cf8208d0SJens Axboe struct splice_desc *sd) 8391da177e4SLinus Torvalds { 840cf8208d0SJens Axboe struct svc_rqst *rqstp = sd->u.data; 84144524359SNeilBrown struct page **pp = rqstp->rq_respages + rqstp->rq_resused; 842cf8208d0SJens Axboe struct page *page = buf->page; 843cf8208d0SJens Axboe size_t size; 844cf8208d0SJens Axboe 845cf8208d0SJens Axboe size = sd->len; 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 8481da177e4SLinus Torvalds get_page(page); 84944524359SNeilBrown put_page(*pp); 85044524359SNeilBrown *pp = page; 85144524359SNeilBrown rqstp->rq_resused++; 852cf8208d0SJens Axboe rqstp->rq_res.page_base = buf->offset; 8531da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 85444524359SNeilBrown } else if (page != pp[-1]) { 8551da177e4SLinus Torvalds get_page(page); 856250f3915SNeilBrown if (*pp) 85744524359SNeilBrown put_page(*pp); 85844524359SNeilBrown *pp = page; 85944524359SNeilBrown rqstp->rq_resused++; 8601da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 86144524359SNeilBrown } else 8621da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds return size; 8651da177e4SLinus Torvalds } 8661da177e4SLinus Torvalds 867cf8208d0SJens Axboe static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, 868cf8208d0SJens Axboe struct splice_desc *sd) 869cf8208d0SJens Axboe { 870cf8208d0SJens Axboe return __splice_from_pipe(pipe, sd, nfsd_splice_actor); 871cf8208d0SJens Axboe } 872cf8208d0SJens Axboe 8736264d69dSAl Viro static __be32 8741da177e4SLinus Torvalds nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 8751da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 8761da177e4SLinus Torvalds { 8771da177e4SLinus Torvalds mm_segment_t oldfs; 8786264d69dSAl Viro __be32 err; 8796264d69dSAl Viro int host_err; 8801da177e4SLinus Torvalds 8811da177e4SLinus Torvalds err = nfserr_perm; 882a8754beeSDave Hansen 883cf8208d0SJens Axboe if (file->f_op->splice_read && rqstp->rq_splice_ok) { 884cf8208d0SJens Axboe struct splice_desc sd = { 885cf8208d0SJens Axboe .len = 0, 886cf8208d0SJens Axboe .total_len = *count, 887cf8208d0SJens Axboe .pos = offset, 888cf8208d0SJens Axboe .u.data = rqstp, 889cf8208d0SJens Axboe }; 890cf8208d0SJens Axboe 8914fbef206SJens Axboe rqstp->rq_resused = 1; 892cf8208d0SJens Axboe host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); 8931da177e4SLinus Torvalds } else { 8941da177e4SLinus Torvalds oldfs = get_fs(); 8951da177e4SLinus Torvalds set_fs(KERNEL_DS); 8966264d69dSAl Viro host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); 8971da177e4SLinus Torvalds set_fs(oldfs); 8981da177e4SLinus Torvalds } 8991da177e4SLinus Torvalds 9006264d69dSAl Viro if (host_err >= 0) { 9016264d69dSAl Viro nfsdstats.io_read += host_err; 9026264d69dSAl Viro *count = host_err; 9031da177e4SLinus Torvalds err = 0; 9042a12a9d7SEric Paris fsnotify_access(file); 9051da177e4SLinus Torvalds } else 9066264d69dSAl Viro err = nfserrno(host_err); 9071da177e4SLinus Torvalds return err; 9081da177e4SLinus Torvalds } 9091da177e4SLinus Torvalds 9109f708e40SNeil Brown static void kill_suid(struct dentry *dentry) 9119f708e40SNeil Brown { 9129f708e40SNeil Brown struct iattr ia; 913b5376771SSerge E. Hallyn ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; 9149f708e40SNeil Brown 9151b1dcc1bSJes Sorensen mutex_lock(&dentry->d_inode->i_mutex); 9169f708e40SNeil Brown notify_change(dentry, &ia); 9171b1dcc1bSJes Sorensen mutex_unlock(&dentry->d_inode->i_mutex); 9189f708e40SNeil Brown } 9199f708e40SNeil Brown 920d911df7bSJ. Bruce Fields /* 921d911df7bSJ. Bruce Fields * Gathered writes: If another process is currently writing to the file, 922d911df7bSJ. Bruce Fields * there's a high chance this is another nfsd (triggered by a bulk write 923d911df7bSJ. Bruce Fields * from a client's biod). Rather than syncing the file with each write 924d911df7bSJ. Bruce Fields * request, we sleep for 10 msec. 925d911df7bSJ. Bruce Fields * 926d911df7bSJ. Bruce Fields * I don't know if this roughly approximates C. Juszak's idea of 927d911df7bSJ. Bruce Fields * gathered writes, but it's a nice and simple solution (IMHO), and it 928d911df7bSJ. Bruce Fields * seems to work:-) 929d911df7bSJ. Bruce Fields * 930d911df7bSJ. Bruce Fields * Note: we do this only in the NFSv2 case, since v3 and higher have a 931d911df7bSJ. Bruce Fields * better tool (separate unstable writes and commits) for solving this 932d911df7bSJ. Bruce Fields * problem. 933d911df7bSJ. Bruce Fields */ 934d911df7bSJ. Bruce Fields static int wait_for_concurrent_writes(struct file *file) 935d911df7bSJ. Bruce Fields { 936d911df7bSJ. Bruce Fields struct inode *inode = file->f_path.dentry->d_inode; 937d911df7bSJ. Bruce Fields static ino_t last_ino; 938d911df7bSJ. Bruce Fields static dev_t last_dev; 939d911df7bSJ. Bruce Fields int err = 0; 940d911df7bSJ. Bruce Fields 941d911df7bSJ. Bruce Fields if (atomic_read(&inode->i_writecount) > 1 942d911df7bSJ. Bruce Fields || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 943d911df7bSJ. Bruce Fields dprintk("nfsd: write defer %d\n", task_pid_nr(current)); 944d911df7bSJ. Bruce Fields msleep(10); 945d911df7bSJ. Bruce Fields dprintk("nfsd: write resume %d\n", task_pid_nr(current)); 946d911df7bSJ. Bruce Fields } 947d911df7bSJ. Bruce Fields 948d911df7bSJ. Bruce Fields if (inode->i_state & I_DIRTY) { 949d911df7bSJ. Bruce Fields dprintk("nfsd: write sync %d\n", task_pid_nr(current)); 9508018ab05SChristoph Hellwig err = vfs_fsync(file, 0); 951d911df7bSJ. Bruce Fields } 952d911df7bSJ. Bruce Fields last_ino = inode->i_ino; 953d911df7bSJ. Bruce Fields last_dev = inode->i_sb->s_dev; 954d911df7bSJ. Bruce Fields return err; 955d911df7bSJ. Bruce Fields } 956d911df7bSJ. Bruce Fields 9576264d69dSAl Viro static __be32 9581da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 9591da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 96031dec253SDavid Shaw unsigned long *cnt, int *stablep) 9611da177e4SLinus Torvalds { 9621da177e4SLinus Torvalds struct svc_export *exp; 9631da177e4SLinus Torvalds struct dentry *dentry; 9641da177e4SLinus Torvalds struct inode *inode; 9651da177e4SLinus Torvalds mm_segment_t oldfs; 9666264d69dSAl Viro __be32 err = 0; 9676264d69dSAl Viro int host_err; 9681da177e4SLinus Torvalds int stable = *stablep; 96948e03bc5STrond Myklebust int use_wgather; 9701da177e4SLinus Torvalds 9717eaa36e2SJosef "Jeff" Sipek dentry = file->f_path.dentry; 9721da177e4SLinus Torvalds inode = dentry->d_inode; 9731da177e4SLinus Torvalds exp = fhp->fh_export; 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds /* 9761da177e4SLinus Torvalds * Request sync writes if 9771da177e4SLinus Torvalds * - the sync export option has been set, or 9781da177e4SLinus Torvalds * - the client requested O_SYNC behavior (NFSv3 feature). 9791da177e4SLinus Torvalds * - The file system doesn't support fsync(). 98048e03bc5STrond Myklebust * When NFSv2 gathered writes have been configured for this volume, 9811da177e4SLinus Torvalds * flushing the data to disk is handled separately below. 9821da177e4SLinus Torvalds */ 98348e03bc5STrond Myklebust use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); 9841da177e4SLinus Torvalds 9853ba15148SHarvey Harrison if (!file->f_op->fsync) {/* COMMIT3 cannot work */ 9861da177e4SLinus Torvalds stable = 2; 9871da177e4SLinus Torvalds *stablep = 2; /* FILE_SYNC */ 9881da177e4SLinus Torvalds } 9891da177e4SLinus Torvalds 9901da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 9911da177e4SLinus Torvalds stable = 0; 99248e03bc5STrond Myklebust if (stable && !use_wgather) { 993db1dd4d3SJonathan Corbet spin_lock(&file->f_lock); 9941da177e4SLinus Torvalds file->f_flags |= O_SYNC; 995db1dd4d3SJonathan Corbet spin_unlock(&file->f_lock); 996db1dd4d3SJonathan Corbet } 9971da177e4SLinus Torvalds 9981da177e4SLinus Torvalds /* Write the data. */ 9991da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 10006264d69dSAl Viro host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); 10011da177e4SLinus Torvalds set_fs(oldfs); 1002e4636d53SJ. Bruce Fields if (host_err < 0) 1003e4636d53SJ. Bruce Fields goto out_nfserr; 1004a0d24b29SWei Yongjun *cnt = host_err; 100531dec253SDavid Shaw nfsdstats.io_write += host_err; 10062a12a9d7SEric Paris fsnotify_modify(file); 10071da177e4SLinus Torvalds 10081da177e4SLinus Torvalds /* clear setuid/setgid flag after write */ 1009e4636d53SJ. Bruce Fields if (inode->i_mode & (S_ISUID | S_ISGID)) 10109f708e40SNeil Brown kill_suid(dentry); 10111da177e4SLinus Torvalds 1012e4636d53SJ. Bruce Fields if (stable && use_wgather) 1013d911df7bSJ. Bruce Fields host_err = wait_for_concurrent_writes(file); 10141da177e4SLinus Torvalds 1015e4636d53SJ. Bruce Fields out_nfserr: 10166264d69dSAl Viro dprintk("nfsd: write complete host_err=%d\n", host_err); 1017a0d24b29SWei Yongjun if (host_err >= 0) 10181da177e4SLinus Torvalds err = 0; 1019a0d24b29SWei Yongjun else 10206264d69dSAl Viro err = nfserrno(host_err); 10211da177e4SLinus Torvalds return err; 10221da177e4SLinus Torvalds } 10231da177e4SLinus Torvalds 10241da177e4SLinus Torvalds /* 10251da177e4SLinus Torvalds * Read data from a file. count must contain the requested read count 10261da177e4SLinus Torvalds * on entry. On return, *count contains the number of bytes actually read. 10271da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10281da177e4SLinus Torvalds */ 1029039a87caSJ. Bruce Fields __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, 1030fa0a2126SJ. Bruce Fields loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 1031fa0a2126SJ. Bruce Fields { 1032fa0a2126SJ. Bruce Fields struct file *file; 1033fa0a2126SJ. Bruce Fields struct inode *inode; 1034fa0a2126SJ. Bruce Fields struct raparms *ra; 1035fa0a2126SJ. Bruce Fields __be32 err; 1036fa0a2126SJ. Bruce Fields 1037fa0a2126SJ. Bruce Fields err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 1038fa0a2126SJ. Bruce Fields if (err) 1039fa0a2126SJ. Bruce Fields return err; 1040fa0a2126SJ. Bruce Fields 1041fa0a2126SJ. Bruce Fields inode = file->f_path.dentry->d_inode; 1042fa0a2126SJ. Bruce Fields 1043fa0a2126SJ. Bruce Fields /* Get readahead parameters */ 1044fa0a2126SJ. Bruce Fields ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); 1045fa0a2126SJ. Bruce Fields 1046fa0a2126SJ. Bruce Fields if (ra && ra->p_set) 1047fa0a2126SJ. Bruce Fields file->f_ra = ra->p_ra; 1048fa0a2126SJ. Bruce Fields 1049fa0a2126SJ. Bruce Fields err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 1050fa0a2126SJ. Bruce Fields 1051fa0a2126SJ. Bruce Fields /* Write back readahead params */ 1052fa0a2126SJ. Bruce Fields if (ra) { 1053fa0a2126SJ. Bruce Fields struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; 1054fa0a2126SJ. Bruce Fields spin_lock(&rab->pb_lock); 1055fa0a2126SJ. Bruce Fields ra->p_ra = file->f_ra; 1056fa0a2126SJ. Bruce Fields ra->p_set = 1; 1057fa0a2126SJ. Bruce Fields ra->p_count--; 1058fa0a2126SJ. Bruce Fields spin_unlock(&rab->pb_lock); 1059fa0a2126SJ. Bruce Fields } 1060fa0a2126SJ. Bruce Fields 1061fa0a2126SJ. Bruce Fields nfsd_close(file); 1062fa0a2126SJ. Bruce Fields return err; 1063fa0a2126SJ. Bruce Fields } 1064fa0a2126SJ. Bruce Fields 1065039a87caSJ. Bruce Fields /* As above, but use the provided file descriptor. */ 10666264d69dSAl Viro __be32 1067039a87caSJ. Bruce Fields nfsd_read_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10681da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 10691da177e4SLinus Torvalds unsigned long *count) 10701da177e4SLinus Torvalds { 10716264d69dSAl Viro __be32 err; 10721da177e4SLinus Torvalds 10731da177e4SLinus Torvalds if (file) { 10740ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 10758837abcaSMiklos Szeredi NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); 10761da177e4SLinus Torvalds if (err) 10771da177e4SLinus Torvalds goto out; 10781da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 1079039a87caSJ. Bruce Fields } else /* Note file may still be NULL in NFSv4 special stateid case: */ 1080039a87caSJ. Bruce Fields err = nfsd_read(rqstp, fhp, offset, vec, vlen, count); 10811da177e4SLinus Torvalds out: 10821da177e4SLinus Torvalds return err; 10831da177e4SLinus Torvalds } 10841da177e4SLinus Torvalds 10851da177e4SLinus Torvalds /* 10861da177e4SLinus Torvalds * Write data to a file. 10871da177e4SLinus Torvalds * The stable flag requests synchronous writes. 10881da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10891da177e4SLinus Torvalds */ 10906264d69dSAl Viro __be32 10911da177e4SLinus Torvalds nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 109231dec253SDavid Shaw loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, 10931da177e4SLinus Torvalds int *stablep) 10941da177e4SLinus Torvalds { 10956264d69dSAl Viro __be32 err = 0; 10961da177e4SLinus Torvalds 10971da177e4SLinus Torvalds if (file) { 10980ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 10998837abcaSMiklos Szeredi NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); 11001da177e4SLinus Torvalds if (err) 11011da177e4SLinus Torvalds goto out; 11021da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, 11031da177e4SLinus Torvalds stablep); 11041da177e4SLinus Torvalds } else { 11058837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 11061da177e4SLinus Torvalds if (err) 11071da177e4SLinus Torvalds goto out; 11081da177e4SLinus Torvalds 11091da177e4SLinus Torvalds if (cnt) 11101da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, 11111da177e4SLinus Torvalds cnt, stablep); 11121da177e4SLinus Torvalds nfsd_close(file); 11131da177e4SLinus Torvalds } 11141da177e4SLinus Torvalds out: 11151da177e4SLinus Torvalds return err; 11161da177e4SLinus Torvalds } 11171da177e4SLinus Torvalds 11181da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 11191da177e4SLinus Torvalds /* 11201da177e4SLinus Torvalds * Commit all pending writes to stable storage. 1121aa696a6fSTrond Myklebust * 1122aa696a6fSTrond Myklebust * Note: we only guarantee that data that lies within the range specified 1123aa696a6fSTrond Myklebust * by the 'offset' and 'count' parameters will be synced. 11241da177e4SLinus Torvalds * 11251da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 11261da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 11271da177e4SLinus Torvalds */ 11286264d69dSAl Viro __be32 11291da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 11301da177e4SLinus Torvalds loff_t offset, unsigned long count) 11311da177e4SLinus Torvalds { 11321da177e4SLinus Torvalds struct file *file; 1133aa696a6fSTrond Myklebust loff_t end = LLONG_MAX; 1134aa696a6fSTrond Myklebust __be32 err = nfserr_inval; 11351da177e4SLinus Torvalds 1136aa696a6fSTrond Myklebust if (offset < 0) 1137aa696a6fSTrond Myklebust goto out; 1138aa696a6fSTrond Myklebust if (count != 0) { 1139aa696a6fSTrond Myklebust end = offset + (loff_t)count - 1; 1140aa696a6fSTrond Myklebust if (end < offset) 1141aa696a6fSTrond Myklebust goto out; 1142aa696a6fSTrond Myklebust } 11431da177e4SLinus Torvalds 114491885258SJeff Layton err = nfsd_open(rqstp, fhp, S_IFREG, 114591885258SJeff Layton NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file); 11468837abcaSMiklos Szeredi if (err) 1147aa696a6fSTrond Myklebust goto out; 11481da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 11498018ab05SChristoph Hellwig int err2 = vfs_fsync_range(file, offset, end, 0); 1150aa696a6fSTrond Myklebust 1151aa696a6fSTrond Myklebust if (err2 != -EINVAL) 1152aa696a6fSTrond Myklebust err = nfserrno(err2); 1153aa696a6fSTrond Myklebust else 11541da177e4SLinus Torvalds err = nfserr_notsupp; 11551da177e4SLinus Torvalds } 11561da177e4SLinus Torvalds 11571da177e4SLinus Torvalds nfsd_close(file); 1158aa696a6fSTrond Myklebust out: 11591da177e4SLinus Torvalds return err; 11601da177e4SLinus Torvalds } 11611da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 11621da177e4SLinus Torvalds 1163f2b0dee2SAdrian Bunk static __be32 11645c002b3bSJ. Bruce Fields nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, 11655c002b3bSJ. Bruce Fields struct iattr *iap) 11665c002b3bSJ. Bruce Fields { 11675c002b3bSJ. Bruce Fields /* 11685c002b3bSJ. Bruce Fields * Mode has already been set earlier in create: 11695c002b3bSJ. Bruce Fields */ 11705c002b3bSJ. Bruce Fields iap->ia_valid &= ~ATTR_MODE; 11715c002b3bSJ. Bruce Fields /* 11725c002b3bSJ. Bruce Fields * Setting uid/gid works only for root. Irix appears to 11735c002b3bSJ. Bruce Fields * send along the gid on create when it tries to implement 11745c002b3bSJ. Bruce Fields * setgid directories via NFS: 11755c002b3bSJ. Bruce Fields */ 11765cc0a840SDavid Howells if (current_fsuid() != 0) 11775c002b3bSJ. Bruce Fields iap->ia_valid &= ~(ATTR_UID|ATTR_GID); 11785c002b3bSJ. Bruce Fields if (iap->ia_valid) 11795c002b3bSJ. Bruce Fields return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 11805c002b3bSJ. Bruce Fields return 0; 11815c002b3bSJ. Bruce Fields } 11825c002b3bSJ. Bruce Fields 11834ac35c2fSwengang wang /* HPUX client sometimes creates a file in mode 000, and sets size to 0. 11844ac35c2fSwengang wang * setting size to 0 may fail for some specific file systems by the permission 11854ac35c2fSwengang wang * checking which requires WRITE permission but the mode is 000. 11864ac35c2fSwengang wang * we ignore the resizing(to 0) on the just new created file, since the size is 11874ac35c2fSwengang wang * 0 after file created. 11884ac35c2fSwengang wang * 11894ac35c2fSwengang wang * call this only after vfs_create() is called. 11904ac35c2fSwengang wang * */ 11914ac35c2fSwengang wang static void 11924ac35c2fSwengang wang nfsd_check_ignore_resizing(struct iattr *iap) 11934ac35c2fSwengang wang { 11944ac35c2fSwengang wang if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) 11954ac35c2fSwengang wang iap->ia_valid &= ~ATTR_SIZE; 11964ac35c2fSwengang wang } 11974ac35c2fSwengang wang 11981da177e4SLinus Torvalds /* 11991da177e4SLinus Torvalds * Create a file (regular, directory, device, fifo); UNIX sockets 12001da177e4SLinus Torvalds * not yet implemented. 12011da177e4SLinus Torvalds * If the response fh has been verified, the parent directory should 12021da177e4SLinus Torvalds * already be locked. Note that the parent directory is left locked. 12031da177e4SLinus Torvalds * 12041da177e4SLinus Torvalds * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 12051da177e4SLinus Torvalds */ 12066264d69dSAl Viro __be32 12071da177e4SLinus Torvalds nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 12081da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 12091da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 12101da177e4SLinus Torvalds { 12111da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 12121da177e4SLinus Torvalds struct inode *dirp; 12136264d69dSAl Viro __be32 err; 12145c002b3bSJ. Bruce Fields __be32 err2; 12156264d69dSAl Viro int host_err; 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds err = nfserr_perm; 12181da177e4SLinus Torvalds if (!flen) 12191da177e4SLinus Torvalds goto out; 12201da177e4SLinus Torvalds err = nfserr_exist; 12211da177e4SLinus Torvalds if (isdotent(fname, flen)) 12221da177e4SLinus Torvalds goto out; 12231da177e4SLinus Torvalds 12248837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 12251da177e4SLinus Torvalds if (err) 12261da177e4SLinus Torvalds goto out; 12271da177e4SLinus Torvalds 12281da177e4SLinus Torvalds dentry = fhp->fh_dentry; 12291da177e4SLinus Torvalds dirp = dentry->d_inode; 12301da177e4SLinus Torvalds 12311da177e4SLinus Torvalds err = nfserr_notdir; 1232acfa4380SAl Viro if (!dirp->i_op->lookup) 12331da177e4SLinus Torvalds goto out; 12341da177e4SLinus Torvalds /* 12351da177e4SLinus Torvalds * Check whether the response file handle has been verified yet. 12361da177e4SLinus Torvalds * If it has, the parent directory should already be locked. 12371da177e4SLinus Torvalds */ 12381da177e4SLinus Torvalds if (!resfhp->fh_dentry) { 12391da177e4SLinus Torvalds /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ 124012fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 12411da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 12426264d69dSAl Viro host_err = PTR_ERR(dchild); 12431da177e4SLinus Torvalds if (IS_ERR(dchild)) 12441da177e4SLinus Torvalds goto out_nfserr; 12451da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 12461da177e4SLinus Torvalds if (err) 12471da177e4SLinus Torvalds goto out; 12481da177e4SLinus Torvalds } else { 12491da177e4SLinus Torvalds /* called from nfsd_proc_create */ 12501da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 12511da177e4SLinus Torvalds if (!fhp->fh_locked) { 12521da177e4SLinus Torvalds /* not actually possible */ 12531da177e4SLinus Torvalds printk(KERN_ERR 12541da177e4SLinus Torvalds "nfsd_create: parent %s/%s not locked!\n", 12551da177e4SLinus Torvalds dentry->d_parent->d_name.name, 12561da177e4SLinus Torvalds dentry->d_name.name); 1257d75f2b9fSAl Viro err = nfserr_io; 12581da177e4SLinus Torvalds goto out; 12591da177e4SLinus Torvalds } 12601da177e4SLinus Torvalds } 12611da177e4SLinus Torvalds /* 12621da177e4SLinus Torvalds * Make sure the child dentry is still negative ... 12631da177e4SLinus Torvalds */ 12641da177e4SLinus Torvalds err = nfserr_exist; 12651da177e4SLinus Torvalds if (dchild->d_inode) { 12661da177e4SLinus Torvalds dprintk("nfsd_create: dentry %s/%s not negative!\n", 12671da177e4SLinus Torvalds dentry->d_name.name, dchild->d_name.name); 12681da177e4SLinus Torvalds goto out; 12691da177e4SLinus Torvalds } 12701da177e4SLinus Torvalds 12711da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 12721da177e4SLinus Torvalds iap->ia_mode = 0; 12731da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 12741da177e4SLinus Torvalds 127507cad1d2SMiklos Szeredi err = nfserr_inval; 127607cad1d2SMiklos Szeredi if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { 127707cad1d2SMiklos Szeredi printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", 127807cad1d2SMiklos Szeredi type); 127907cad1d2SMiklos Szeredi goto out; 128007cad1d2SMiklos Szeredi } 128107cad1d2SMiklos Szeredi 128207cad1d2SMiklos Szeredi host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 128307cad1d2SMiklos Szeredi if (host_err) 128407cad1d2SMiklos Szeredi goto out_nfserr; 128507cad1d2SMiklos Szeredi 12861da177e4SLinus Torvalds /* 12871da177e4SLinus Torvalds * Get the dir op function pointer. 12881da177e4SLinus Torvalds */ 1289088406bcSJ. Bruce Fields err = 0; 12901da177e4SLinus Torvalds switch (type) { 12911da177e4SLinus Torvalds case S_IFREG: 12926264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 12934ac35c2fSwengang wang if (!host_err) 12944ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 12951da177e4SLinus Torvalds break; 12961da177e4SLinus Torvalds case S_IFDIR: 12976264d69dSAl Viro host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); 12981da177e4SLinus Torvalds break; 12991da177e4SLinus Torvalds case S_IFCHR: 13001da177e4SLinus Torvalds case S_IFBLK: 13011da177e4SLinus Torvalds case S_IFIFO: 13021da177e4SLinus Torvalds case S_IFSOCK: 13036264d69dSAl Viro host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 13041da177e4SLinus Torvalds break; 1305463c3197SDave Hansen } 1306463c3197SDave Hansen if (host_err < 0) { 1307463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1308463c3197SDave Hansen goto out_nfserr; 1309463c3197SDave Hansen } 13101da177e4SLinus Torvalds 1311f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 13121da177e4SLinus Torvalds 1313f501912aSBen Myers /* 1314f501912aSBen Myers * nfsd_setattr already committed the child. Transactional filesystems 1315f501912aSBen Myers * had a chance to commit changes for both parent and child 1316f501912aSBen Myers * simultaneously making the following commit_metadata a noop. 1317f501912aSBen Myers */ 1318f501912aSBen Myers err2 = nfserrno(commit_metadata(fhp)); 1319f193fbabSYAMAMOTO Takashi if (err2) 1320f193fbabSYAMAMOTO Takashi err = err2; 1321463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 13221da177e4SLinus Torvalds /* 13231da177e4SLinus Torvalds * Update the file handle to get the new inode info. 13241da177e4SLinus Torvalds */ 13251da177e4SLinus Torvalds if (!err) 13261da177e4SLinus Torvalds err = fh_update(resfhp); 13271da177e4SLinus Torvalds out: 13281da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 13291da177e4SLinus Torvalds dput(dchild); 13301da177e4SLinus Torvalds return err; 13311da177e4SLinus Torvalds 13321da177e4SLinus Torvalds out_nfserr: 13336264d69dSAl Viro err = nfserrno(host_err); 13341da177e4SLinus Torvalds goto out; 13351da177e4SLinus Torvalds } 13361da177e4SLinus Torvalds 13371da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 1338ac6721a1SMi Jinlong 1339ac6721a1SMi Jinlong static inline int nfsd_create_is_exclusive(int createmode) 1340ac6721a1SMi Jinlong { 1341ac6721a1SMi Jinlong return createmode == NFS3_CREATE_EXCLUSIVE 1342ac6721a1SMi Jinlong || createmode == NFS4_CREATE_EXCLUSIVE4_1; 1343ac6721a1SMi Jinlong } 1344ac6721a1SMi Jinlong 13451da177e4SLinus Torvalds /* 1346ac6721a1SMi Jinlong * NFSv3 and NFSv4 version of nfsd_create 13471da177e4SLinus Torvalds */ 13486264d69dSAl Viro __be32 1349ac6721a1SMi Jinlong do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 13501da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 13511da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 135281ac95c5SJ. Bruce Fields int *truncp, int *created) 13531da177e4SLinus Torvalds { 13541da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 13551da177e4SLinus Torvalds struct inode *dirp; 13566264d69dSAl Viro __be32 err; 13576264d69dSAl Viro int host_err; 13581da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 13591da177e4SLinus Torvalds 13601da177e4SLinus Torvalds err = nfserr_perm; 13611da177e4SLinus Torvalds if (!flen) 13621da177e4SLinus Torvalds goto out; 13631da177e4SLinus Torvalds err = nfserr_exist; 13641da177e4SLinus Torvalds if (isdotent(fname, flen)) 13651da177e4SLinus Torvalds goto out; 13661da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 13671da177e4SLinus Torvalds iap->ia_mode = 0; 13681574dff8SSachin Prabhu err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 13691da177e4SLinus Torvalds if (err) 13701da177e4SLinus Torvalds goto out; 13711da177e4SLinus Torvalds 13721da177e4SLinus Torvalds dentry = fhp->fh_dentry; 13731da177e4SLinus Torvalds dirp = dentry->d_inode; 13741da177e4SLinus Torvalds 13751da177e4SLinus Torvalds /* Get all the sanity checks out of the way before 13761da177e4SLinus Torvalds * we lock the parent. */ 13771da177e4SLinus Torvalds err = nfserr_notdir; 1378acfa4380SAl Viro if (!dirp->i_op->lookup) 13791da177e4SLinus Torvalds goto out; 138012fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 13811da177e4SLinus Torvalds 13821da177e4SLinus Torvalds /* 13831da177e4SLinus Torvalds * Compose the response file handle. 13841da177e4SLinus Torvalds */ 13851da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 13866264d69dSAl Viro host_err = PTR_ERR(dchild); 13871da177e4SLinus Torvalds if (IS_ERR(dchild)) 13881da177e4SLinus Torvalds goto out_nfserr; 13891da177e4SLinus Torvalds 13901574dff8SSachin Prabhu /* If file doesn't exist, check for permissions to create one */ 13911574dff8SSachin Prabhu if (!dchild->d_inode) { 13921574dff8SSachin Prabhu err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 13931574dff8SSachin Prabhu if (err) 13941574dff8SSachin Prabhu goto out; 13951574dff8SSachin Prabhu } 13961574dff8SSachin Prabhu 13971da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 13981da177e4SLinus Torvalds if (err) 13991da177e4SLinus Torvalds goto out; 14001da177e4SLinus Torvalds 1401ac6721a1SMi Jinlong if (nfsd_create_is_exclusive(createmode)) { 1402c397852cSPeter Staubach /* solaris7 gets confused (bugid 4218508) if these have 1403749997e5SJeff Layton * the high bit set, so just clear the high bits. If this is 1404749997e5SJeff Layton * ever changed to use different attrs for storing the 1405749997e5SJeff Layton * verifier, then do_open_lookup() will also need to be fixed 1406749997e5SJeff Layton * accordingly. 14071da177e4SLinus Torvalds */ 14081da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 14091da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 14101da177e4SLinus Torvalds } 14111da177e4SLinus Torvalds 1412463c3197SDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 1413463c3197SDave Hansen if (host_err) 1414463c3197SDave Hansen goto out_nfserr; 14151da177e4SLinus Torvalds if (dchild->d_inode) { 14161da177e4SLinus Torvalds err = 0; 14171da177e4SLinus Torvalds 14181da177e4SLinus Torvalds switch (createmode) { 14191da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 14201da177e4SLinus Torvalds if (! S_ISREG(dchild->d_inode->i_mode)) 14211da177e4SLinus Torvalds err = nfserr_exist; 14221da177e4SLinus Torvalds else if (truncp) { 14231da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 14241da177e4SLinus Torvalds * differently. we don't want to truncate the 14251da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 14261da177e4SLinus Torvalds * fails for some other reason. furthermore, 14271da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 14281da177e4SLinus Torvalds * according to spec! 14291da177e4SLinus Torvalds */ 14301da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 14311da177e4SLinus Torvalds } 14321da177e4SLinus Torvalds else { 14331da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 14341da177e4SLinus Torvalds goto set_attr; 14351da177e4SLinus Torvalds } 14361da177e4SLinus Torvalds break; 14371da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 14381da177e4SLinus Torvalds if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 14391da177e4SLinus Torvalds && dchild->d_inode->i_atime.tv_sec == v_atime 14401da177e4SLinus Torvalds && dchild->d_inode->i_size == 0 ) 14411da177e4SLinus Torvalds break; 1442ac6721a1SMi Jinlong case NFS4_CREATE_EXCLUSIVE4_1: 1443ac6721a1SMi Jinlong if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 1444ac6721a1SMi Jinlong && dchild->d_inode->i_atime.tv_sec == v_atime 1445ac6721a1SMi Jinlong && dchild->d_inode->i_size == 0 ) 1446ac6721a1SMi Jinlong goto set_attr; 14471da177e4SLinus Torvalds /* fallthru */ 14481da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 14491da177e4SLinus Torvalds err = nfserr_exist; 14501da177e4SLinus Torvalds } 1451463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14521da177e4SLinus Torvalds goto out; 14531da177e4SLinus Torvalds } 14541da177e4SLinus Torvalds 14556264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 1456463c3197SDave Hansen if (host_err < 0) { 1457463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14581da177e4SLinus Torvalds goto out_nfserr; 1459463c3197SDave Hansen } 146081ac95c5SJ. Bruce Fields if (created) 146181ac95c5SJ. Bruce Fields *created = 1; 14621da177e4SLinus Torvalds 14634ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 14644ac35c2fSwengang wang 1465ac6721a1SMi Jinlong if (nfsd_create_is_exclusive(createmode)) { 1466c397852cSPeter Staubach /* Cram the verifier into atime/mtime */ 14671da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 1468c397852cSPeter Staubach | ATTR_MTIME_SET|ATTR_ATIME_SET; 14691da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 14701da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 14711da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 14721da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 14731da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 14741da177e4SLinus Torvalds } 14751da177e4SLinus Torvalds 14761da177e4SLinus Torvalds set_attr: 1477f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 1478f501912aSBen Myers 1479f501912aSBen Myers /* 1480f501912aSBen Myers * nfsd_setattr already committed the child (and possibly also the parent). 1481f501912aSBen Myers */ 1482f501912aSBen Myers if (!err) 1483f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 1484f193fbabSYAMAMOTO Takashi 1485463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1486f193fbabSYAMAMOTO Takashi /* 1487f193fbabSYAMAMOTO Takashi * Update the filehandle to get the new inode info. 1488f193fbabSYAMAMOTO Takashi */ 1489f193fbabSYAMAMOTO Takashi if (!err) 1490f193fbabSYAMAMOTO Takashi err = fh_update(resfhp); 14911da177e4SLinus Torvalds 14921da177e4SLinus Torvalds out: 14931da177e4SLinus Torvalds fh_unlock(fhp); 14941da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 14951da177e4SLinus Torvalds dput(dchild); 14961da177e4SLinus Torvalds return err; 14971da177e4SLinus Torvalds 14981da177e4SLinus Torvalds out_nfserr: 14996264d69dSAl Viro err = nfserrno(host_err); 15001da177e4SLinus Torvalds goto out; 15011da177e4SLinus Torvalds } 15021da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 15031da177e4SLinus Torvalds 15041da177e4SLinus Torvalds /* 15051da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 15061da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 15071da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 15081da177e4SLinus Torvalds */ 15096264d69dSAl Viro __be32 15101da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 15111da177e4SLinus Torvalds { 15121da177e4SLinus Torvalds struct dentry *dentry; 15131da177e4SLinus Torvalds struct inode *inode; 15141da177e4SLinus Torvalds mm_segment_t oldfs; 15156264d69dSAl Viro __be32 err; 15166264d69dSAl Viro int host_err; 15171da177e4SLinus Torvalds 15188837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); 15191da177e4SLinus Torvalds if (err) 15201da177e4SLinus Torvalds goto out; 15211da177e4SLinus Torvalds 15221da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15231da177e4SLinus Torvalds inode = dentry->d_inode; 15241da177e4SLinus Torvalds 15251da177e4SLinus Torvalds err = nfserr_inval; 1526acfa4380SAl Viro if (!inode->i_op->readlink) 15271da177e4SLinus Torvalds goto out; 15281da177e4SLinus Torvalds 152954775491SJan Blunck touch_atime(fhp->fh_export->ex_path.mnt, dentry); 15301da177e4SLinus Torvalds /* N.B. Why does this call need a get_fs()?? 15311da177e4SLinus Torvalds * Remove the set_fs and watch the fireworks:-) --okir 15321da177e4SLinus Torvalds */ 15331da177e4SLinus Torvalds 15341da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 15356264d69dSAl Viro host_err = inode->i_op->readlink(dentry, buf, *lenp); 15361da177e4SLinus Torvalds set_fs(oldfs); 15371da177e4SLinus Torvalds 15386264d69dSAl Viro if (host_err < 0) 15391da177e4SLinus Torvalds goto out_nfserr; 15406264d69dSAl Viro *lenp = host_err; 15411da177e4SLinus Torvalds err = 0; 15421da177e4SLinus Torvalds out: 15431da177e4SLinus Torvalds return err; 15441da177e4SLinus Torvalds 15451da177e4SLinus Torvalds out_nfserr: 15466264d69dSAl Viro err = nfserrno(host_err); 15471da177e4SLinus Torvalds goto out; 15481da177e4SLinus Torvalds } 15491da177e4SLinus Torvalds 15501da177e4SLinus Torvalds /* 15511da177e4SLinus Torvalds * Create a symlink and look up its inode 15521da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 15531da177e4SLinus Torvalds */ 15546264d69dSAl Viro __be32 15551da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 15561da177e4SLinus Torvalds char *fname, int flen, 15571da177e4SLinus Torvalds char *path, int plen, 15581da177e4SLinus Torvalds struct svc_fh *resfhp, 15591da177e4SLinus Torvalds struct iattr *iap) 15601da177e4SLinus Torvalds { 15611da177e4SLinus Torvalds struct dentry *dentry, *dnew; 15626264d69dSAl Viro __be32 err, cerr; 15636264d69dSAl Viro int host_err; 15641da177e4SLinus Torvalds 15651da177e4SLinus Torvalds err = nfserr_noent; 15661da177e4SLinus Torvalds if (!flen || !plen) 15671da177e4SLinus Torvalds goto out; 15681da177e4SLinus Torvalds err = nfserr_exist; 15691da177e4SLinus Torvalds if (isdotent(fname, flen)) 15701da177e4SLinus Torvalds goto out; 15711da177e4SLinus Torvalds 15728837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 15731da177e4SLinus Torvalds if (err) 15741da177e4SLinus Torvalds goto out; 15751da177e4SLinus Torvalds fh_lock(fhp); 15761da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15771da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 15786264d69dSAl Viro host_err = PTR_ERR(dnew); 15791da177e4SLinus Torvalds if (IS_ERR(dnew)) 15801da177e4SLinus Torvalds goto out_nfserr; 15811da177e4SLinus Torvalds 158275c3f29dSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 158375c3f29dSDave Hansen if (host_err) 158475c3f29dSDave Hansen goto out_nfserr; 158575c3f29dSDave Hansen 15861da177e4SLinus Torvalds if (unlikely(path[plen] != 0)) { 15871da177e4SLinus Torvalds char *path_alloced = kmalloc(plen+1, GFP_KERNEL); 15881da177e4SLinus Torvalds if (path_alloced == NULL) 15896264d69dSAl Viro host_err = -ENOMEM; 15901da177e4SLinus Torvalds else { 15911da177e4SLinus Torvalds strncpy(path_alloced, path, plen); 15921da177e4SLinus Torvalds path_alloced[plen] = 0; 1593db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); 15941da177e4SLinus Torvalds kfree(path_alloced); 15951da177e4SLinus Torvalds } 15961da177e4SLinus Torvalds } else 1597db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path); 15986264d69dSAl Viro err = nfserrno(host_err); 1599f501912aSBen Myers if (!err) 1600f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 16011da177e4SLinus Torvalds fh_unlock(fhp); 16021da177e4SLinus Torvalds 160375c3f29dSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 160475c3f29dSDave Hansen 16051da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 16061da177e4SLinus Torvalds dput(dnew); 16071da177e4SLinus Torvalds if (err==0) err = cerr; 16081da177e4SLinus Torvalds out: 16091da177e4SLinus Torvalds return err; 16101da177e4SLinus Torvalds 16111da177e4SLinus Torvalds out_nfserr: 16126264d69dSAl Viro err = nfserrno(host_err); 16131da177e4SLinus Torvalds goto out; 16141da177e4SLinus Torvalds } 16151da177e4SLinus Torvalds 16161da177e4SLinus Torvalds /* 16171da177e4SLinus Torvalds * Create a hardlink 16181da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16191da177e4SLinus Torvalds */ 16206264d69dSAl Viro __be32 16211da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 16221da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 16231da177e4SLinus Torvalds { 16241da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 162555b13354SJ. Bruce Fields struct inode *dirp; 16266264d69dSAl Viro __be32 err; 16276264d69dSAl Viro int host_err; 16281da177e4SLinus Torvalds 16298837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); 16301da177e4SLinus Torvalds if (err) 16311da177e4SLinus Torvalds goto out; 16328837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP); 16331da177e4SLinus Torvalds if (err) 16341da177e4SLinus Torvalds goto out; 16351da177e4SLinus Torvalds 16361da177e4SLinus Torvalds err = nfserr_perm; 16371da177e4SLinus Torvalds if (!len) 16381da177e4SLinus Torvalds goto out; 16391da177e4SLinus Torvalds err = nfserr_exist; 16401da177e4SLinus Torvalds if (isdotent(name, len)) 16411da177e4SLinus Torvalds goto out; 16421da177e4SLinus Torvalds 164312fd3520SPeter Zijlstra fh_lock_nested(ffhp, I_MUTEX_PARENT); 16441da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 16451da177e4SLinus Torvalds dirp = ddir->d_inode; 16461da177e4SLinus Torvalds 16471da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 16486264d69dSAl Viro host_err = PTR_ERR(dnew); 16491da177e4SLinus Torvalds if (IS_ERR(dnew)) 16501da177e4SLinus Torvalds goto out_nfserr; 16511da177e4SLinus Torvalds 16521da177e4SLinus Torvalds dold = tfhp->fh_dentry; 16531da177e4SLinus Torvalds 165475c3f29dSDave Hansen host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt); 165575c3f29dSDave Hansen if (host_err) { 165675c3f29dSDave Hansen err = nfserrno(host_err); 165775c3f29dSDave Hansen goto out_dput; 165875c3f29dSDave Hansen } 16594795bb37SJ. Bruce Fields err = nfserr_noent; 16604795bb37SJ. Bruce Fields if (!dold->d_inode) 16614795bb37SJ. Bruce Fields goto out_drop_write; 16624795bb37SJ. Bruce Fields host_err = nfsd_break_lease(dold->d_inode); 1663*7d751f6fSCasey Bodley if (host_err) { 1664*7d751f6fSCasey Bodley err = nfserrno(host_err); 16654795bb37SJ. Bruce Fields goto out_drop_write; 1666*7d751f6fSCasey Bodley } 16676264d69dSAl Viro host_err = vfs_link(dold, dirp, dnew); 16686264d69dSAl Viro if (!host_err) { 1669f501912aSBen Myers err = nfserrno(commit_metadata(ffhp)); 1670f501912aSBen Myers if (!err) 1671f501912aSBen Myers err = nfserrno(commit_metadata(tfhp)); 16721da177e4SLinus Torvalds } else { 16736264d69dSAl Viro if (host_err == -EXDEV && rqstp->rq_vers == 2) 16741da177e4SLinus Torvalds err = nfserr_acces; 16751da177e4SLinus Torvalds else 16766264d69dSAl Viro err = nfserrno(host_err); 16771da177e4SLinus Torvalds } 16784795bb37SJ. Bruce Fields out_drop_write: 167975c3f29dSDave Hansen mnt_drop_write(tfhp->fh_export->ex_path.mnt); 168075c3f29dSDave Hansen out_dput: 16811da177e4SLinus Torvalds dput(dnew); 1682270d56e5SDavid M. Richter out_unlock: 1683270d56e5SDavid M. Richter fh_unlock(ffhp); 16841da177e4SLinus Torvalds out: 16851da177e4SLinus Torvalds return err; 16861da177e4SLinus Torvalds 16871da177e4SLinus Torvalds out_nfserr: 16886264d69dSAl Viro err = nfserrno(host_err); 1689270d56e5SDavid M. Richter goto out_unlock; 16901da177e4SLinus Torvalds } 16911da177e4SLinus Torvalds 16921da177e4SLinus Torvalds /* 16931da177e4SLinus Torvalds * Rename a file 16941da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16951da177e4SLinus Torvalds */ 16966264d69dSAl Viro __be32 16971da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 16981da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 16991da177e4SLinus Torvalds { 17001da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 17011da177e4SLinus Torvalds struct inode *fdir, *tdir; 17026264d69dSAl Viro __be32 err; 17036264d69dSAl Viro int host_err; 17041da177e4SLinus Torvalds 17058837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); 17061da177e4SLinus Torvalds if (err) 17071da177e4SLinus Torvalds goto out; 17088837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); 17091da177e4SLinus Torvalds if (err) 17101da177e4SLinus Torvalds goto out; 17111da177e4SLinus Torvalds 17121da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 17131da177e4SLinus Torvalds fdir = fdentry->d_inode; 17141da177e4SLinus Torvalds 17151da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 17161da177e4SLinus Torvalds tdir = tdentry->d_inode; 17171da177e4SLinus Torvalds 17181da177e4SLinus Torvalds err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; 1719a56f3937SNeilBrown if (ffhp->fh_export != tfhp->fh_export) 17201da177e4SLinus Torvalds goto out; 17211da177e4SLinus Torvalds 17221da177e4SLinus Torvalds err = nfserr_perm; 17231da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 17241da177e4SLinus Torvalds goto out; 17251da177e4SLinus Torvalds 17261da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 17271da177e4SLinus Torvalds * so do it by hand */ 17281da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 17291da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 1; 17301da177e4SLinus Torvalds fill_pre_wcc(ffhp); 17311da177e4SLinus Torvalds fill_pre_wcc(tfhp); 17321da177e4SLinus Torvalds 17331da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 17346264d69dSAl Viro host_err = PTR_ERR(odentry); 17351da177e4SLinus Torvalds if (IS_ERR(odentry)) 17361da177e4SLinus Torvalds goto out_nfserr; 17371da177e4SLinus Torvalds 17386264d69dSAl Viro host_err = -ENOENT; 17391da177e4SLinus Torvalds if (!odentry->d_inode) 17401da177e4SLinus Torvalds goto out_dput_old; 17416264d69dSAl Viro host_err = -EINVAL; 17421da177e4SLinus Torvalds if (odentry == trap) 17431da177e4SLinus Torvalds goto out_dput_old; 17441da177e4SLinus Torvalds 17451da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 17466264d69dSAl Viro host_err = PTR_ERR(ndentry); 17471da177e4SLinus Torvalds if (IS_ERR(ndentry)) 17481da177e4SLinus Torvalds goto out_dput_old; 17496264d69dSAl Viro host_err = -ENOTEMPTY; 17501da177e4SLinus Torvalds if (ndentry == trap) 17511da177e4SLinus Torvalds goto out_dput_new; 17521da177e4SLinus Torvalds 17539079b1ebSDave Hansen host_err = -EXDEV; 17549079b1ebSDave Hansen if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) 17559079b1ebSDave Hansen goto out_dput_new; 17569079b1ebSDave Hansen host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt); 17579079b1ebSDave Hansen if (host_err) 17589079b1ebSDave Hansen goto out_dput_new; 17599079b1ebSDave Hansen 17604795bb37SJ. Bruce Fields host_err = nfsd_break_lease(odentry->d_inode); 17614795bb37SJ. Bruce Fields if (host_err) 17624795bb37SJ. Bruce Fields goto out_drop_write; 176383f6b0c1SJ. Bruce Fields if (ndentry->d_inode) { 176483f6b0c1SJ. Bruce Fields host_err = nfsd_break_lease(ndentry->d_inode); 176583f6b0c1SJ. Bruce Fields if (host_err) 176683f6b0c1SJ. Bruce Fields goto out_drop_write; 176783f6b0c1SJ. Bruce Fields } 17686264d69dSAl Viro host_err = vfs_rename(fdir, odentry, tdir, ndentry); 1769f501912aSBen Myers if (!host_err) { 1770f501912aSBen Myers host_err = commit_metadata(tfhp); 17716264d69dSAl Viro if (!host_err) 1772f501912aSBen Myers host_err = commit_metadata(ffhp); 17731da177e4SLinus Torvalds } 17744795bb37SJ. Bruce Fields out_drop_write: 17759079b1ebSDave Hansen mnt_drop_write(ffhp->fh_export->ex_path.mnt); 17761da177e4SLinus Torvalds out_dput_new: 17771da177e4SLinus Torvalds dput(ndentry); 17781da177e4SLinus Torvalds out_dput_old: 17791da177e4SLinus Torvalds dput(odentry); 17801da177e4SLinus Torvalds out_nfserr: 17816264d69dSAl Viro err = nfserrno(host_err); 17821da177e4SLinus Torvalds 17831da177e4SLinus Torvalds /* we cannot reply on fh_unlock on the two filehandles, 17841da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 17851da177e4SLinus Torvalds * were the same, so again we do it by hand 17861da177e4SLinus Torvalds */ 17871da177e4SLinus Torvalds fill_post_wcc(ffhp); 17881da177e4SLinus Torvalds fill_post_wcc(tfhp); 17891da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 17901da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 0; 17911da177e4SLinus Torvalds 17921da177e4SLinus Torvalds out: 17931da177e4SLinus Torvalds return err; 17941da177e4SLinus Torvalds } 17951da177e4SLinus Torvalds 17961da177e4SLinus Torvalds /* 17971da177e4SLinus Torvalds * Unlink a file or directory 17981da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 17991da177e4SLinus Torvalds */ 18006264d69dSAl Viro __be32 18011da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 18021da177e4SLinus Torvalds char *fname, int flen) 18031da177e4SLinus Torvalds { 18041da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 18051da177e4SLinus Torvalds struct inode *dirp; 18066264d69dSAl Viro __be32 err; 18076264d69dSAl Viro int host_err; 18081da177e4SLinus Torvalds 18091da177e4SLinus Torvalds err = nfserr_acces; 18101da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 18111da177e4SLinus Torvalds goto out; 18128837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); 18131da177e4SLinus Torvalds if (err) 18141da177e4SLinus Torvalds goto out; 18151da177e4SLinus Torvalds 181612fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 18171da177e4SLinus Torvalds dentry = fhp->fh_dentry; 18181da177e4SLinus Torvalds dirp = dentry->d_inode; 18191da177e4SLinus Torvalds 18201da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 18216264d69dSAl Viro host_err = PTR_ERR(rdentry); 18221da177e4SLinus Torvalds if (IS_ERR(rdentry)) 18231da177e4SLinus Torvalds goto out_nfserr; 18241da177e4SLinus Torvalds 18251da177e4SLinus Torvalds if (!rdentry->d_inode) { 18261da177e4SLinus Torvalds dput(rdentry); 18271da177e4SLinus Torvalds err = nfserr_noent; 18281da177e4SLinus Torvalds goto out; 18291da177e4SLinus Torvalds } 18301da177e4SLinus Torvalds 18311da177e4SLinus Torvalds if (!type) 18321da177e4SLinus Torvalds type = rdentry->d_inode->i_mode & S_IFMT; 18331da177e4SLinus Torvalds 18340622753bSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 18350622753bSDave Hansen if (host_err) 1836541ce98cSJ. Bruce Fields goto out_put; 18370622753bSDave Hansen 18384795bb37SJ. Bruce Fields host_err = nfsd_break_lease(rdentry->d_inode); 18394795bb37SJ. Bruce Fields if (host_err) 1840541ce98cSJ. Bruce Fields goto out_drop_write; 18419ce137eeSJ. Bruce Fields if (type != S_IFDIR) 18426264d69dSAl Viro host_err = vfs_unlink(dirp, rdentry); 18439ce137eeSJ. Bruce Fields else 18446264d69dSAl Viro host_err = vfs_rmdir(dirp, rdentry); 1845541ce98cSJ. Bruce Fields if (!host_err) 1846541ce98cSJ. Bruce Fields host_err = commit_metadata(fhp); 1847541ce98cSJ. Bruce Fields out_drop_write: 1848541ce98cSJ. Bruce Fields mnt_drop_write(fhp->fh_export->ex_path.mnt); 18494795bb37SJ. Bruce Fields out_put: 18501da177e4SLinus Torvalds dput(rdentry); 18511da177e4SLinus Torvalds 18521da177e4SLinus Torvalds out_nfserr: 18536264d69dSAl Viro err = nfserrno(host_err); 1854f193fbabSYAMAMOTO Takashi out: 1855f193fbabSYAMAMOTO Takashi return err; 18561da177e4SLinus Torvalds } 18571da177e4SLinus Torvalds 18581da177e4SLinus Torvalds /* 185914f7dd63SDavid Woodhouse * We do this buffering because we must not call back into the file 186014f7dd63SDavid Woodhouse * system's ->lookup() method from the filldir callback. That may well 186114f7dd63SDavid Woodhouse * deadlock a number of file systems. 186214f7dd63SDavid Woodhouse * 186314f7dd63SDavid Woodhouse * This is based heavily on the implementation of same in XFS. 186414f7dd63SDavid Woodhouse */ 186514f7dd63SDavid Woodhouse struct buffered_dirent { 186614f7dd63SDavid Woodhouse u64 ino; 186714f7dd63SDavid Woodhouse loff_t offset; 186814f7dd63SDavid Woodhouse int namlen; 186914f7dd63SDavid Woodhouse unsigned int d_type; 187014f7dd63SDavid Woodhouse char name[]; 187114f7dd63SDavid Woodhouse }; 187214f7dd63SDavid Woodhouse 187314f7dd63SDavid Woodhouse struct readdir_data { 187414f7dd63SDavid Woodhouse char *dirent; 187514f7dd63SDavid Woodhouse size_t used; 187653c9c5c0SAl Viro int full; 187714f7dd63SDavid Woodhouse }; 187814f7dd63SDavid Woodhouse 187914f7dd63SDavid Woodhouse static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, 188014f7dd63SDavid Woodhouse loff_t offset, u64 ino, unsigned int d_type) 188114f7dd63SDavid Woodhouse { 188214f7dd63SDavid Woodhouse struct readdir_data *buf = __buf; 188314f7dd63SDavid Woodhouse struct buffered_dirent *de = (void *)(buf->dirent + buf->used); 188414f7dd63SDavid Woodhouse unsigned int reclen; 188514f7dd63SDavid Woodhouse 188614f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); 188753c9c5c0SAl Viro if (buf->used + reclen > PAGE_SIZE) { 188853c9c5c0SAl Viro buf->full = 1; 188914f7dd63SDavid Woodhouse return -EINVAL; 189053c9c5c0SAl Viro } 189114f7dd63SDavid Woodhouse 189214f7dd63SDavid Woodhouse de->namlen = namlen; 189314f7dd63SDavid Woodhouse de->offset = offset; 189414f7dd63SDavid Woodhouse de->ino = ino; 189514f7dd63SDavid Woodhouse de->d_type = d_type; 189614f7dd63SDavid Woodhouse memcpy(de->name, name, namlen); 189714f7dd63SDavid Woodhouse buf->used += reclen; 189814f7dd63SDavid Woodhouse 189914f7dd63SDavid Woodhouse return 0; 190014f7dd63SDavid Woodhouse } 190114f7dd63SDavid Woodhouse 19022f9092e1SDavid Woodhouse static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func, 19032628b766SDavid Woodhouse struct readdir_cd *cdp, loff_t *offsetp) 19042628b766SDavid Woodhouse { 190514f7dd63SDavid Woodhouse struct readdir_data buf; 190614f7dd63SDavid Woodhouse struct buffered_dirent *de; 19072628b766SDavid Woodhouse int host_err; 190814f7dd63SDavid Woodhouse int size; 190914f7dd63SDavid Woodhouse loff_t offset; 19102628b766SDavid Woodhouse 191114f7dd63SDavid Woodhouse buf.dirent = (void *)__get_free_page(GFP_KERNEL); 191214f7dd63SDavid Woodhouse if (!buf.dirent) 19132f9092e1SDavid Woodhouse return nfserrno(-ENOMEM); 191414f7dd63SDavid Woodhouse 191514f7dd63SDavid Woodhouse offset = *offsetp; 19162628b766SDavid Woodhouse 191714f7dd63SDavid Woodhouse while (1) { 19182f9092e1SDavid Woodhouse struct inode *dir_inode = file->f_path.dentry->d_inode; 191914f7dd63SDavid Woodhouse unsigned int reclen; 192014f7dd63SDavid Woodhouse 1921b726e923SDoug Nazar cdp->err = nfserr_eof; /* will be cleared on successful read */ 192214f7dd63SDavid Woodhouse buf.used = 0; 192353c9c5c0SAl Viro buf.full = 0; 192414f7dd63SDavid Woodhouse 192514f7dd63SDavid Woodhouse host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf); 192653c9c5c0SAl Viro if (buf.full) 192753c9c5c0SAl Viro host_err = 0; 192853c9c5c0SAl Viro 192953c9c5c0SAl Viro if (host_err < 0) 193014f7dd63SDavid Woodhouse break; 193114f7dd63SDavid Woodhouse 193214f7dd63SDavid Woodhouse size = buf.used; 193314f7dd63SDavid Woodhouse 193414f7dd63SDavid Woodhouse if (!size) 193514f7dd63SDavid Woodhouse break; 193614f7dd63SDavid Woodhouse 19372f9092e1SDavid Woodhouse /* 19382f9092e1SDavid Woodhouse * Various filldir functions may end up calling back into 19392f9092e1SDavid Woodhouse * lookup_one_len() and the file system's ->lookup() method. 19402f9092e1SDavid Woodhouse * These expect i_mutex to be held, as it would within readdir. 19412f9092e1SDavid Woodhouse */ 19422f9092e1SDavid Woodhouse host_err = mutex_lock_killable(&dir_inode->i_mutex); 19432f9092e1SDavid Woodhouse if (host_err) 19442f9092e1SDavid Woodhouse break; 19452f9092e1SDavid Woodhouse 194614f7dd63SDavid Woodhouse de = (struct buffered_dirent *)buf.dirent; 194714f7dd63SDavid Woodhouse while (size > 0) { 194814f7dd63SDavid Woodhouse offset = de->offset; 194914f7dd63SDavid Woodhouse 195014f7dd63SDavid Woodhouse if (func(cdp, de->name, de->namlen, de->offset, 195114f7dd63SDavid Woodhouse de->ino, de->d_type)) 19522f9092e1SDavid Woodhouse break; 195314f7dd63SDavid Woodhouse 195414f7dd63SDavid Woodhouse if (cdp->err != nfs_ok) 19552f9092e1SDavid Woodhouse break; 195614f7dd63SDavid Woodhouse 195714f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(*de) + de->namlen, 195814f7dd63SDavid Woodhouse sizeof(u64)); 195914f7dd63SDavid Woodhouse size -= reclen; 196014f7dd63SDavid Woodhouse de = (struct buffered_dirent *)((char *)de + reclen); 196114f7dd63SDavid Woodhouse } 19622f9092e1SDavid Woodhouse mutex_unlock(&dir_inode->i_mutex); 19632f9092e1SDavid Woodhouse if (size > 0) /* We bailed out early */ 19642f9092e1SDavid Woodhouse break; 19652f9092e1SDavid Woodhouse 1966c002a6c7SDavid Woodhouse offset = vfs_llseek(file, 0, SEEK_CUR); 196714f7dd63SDavid Woodhouse } 196814f7dd63SDavid Woodhouse 196914f7dd63SDavid Woodhouse free_page((unsigned long)(buf.dirent)); 19702628b766SDavid Woodhouse 19712628b766SDavid Woodhouse if (host_err) 19722628b766SDavid Woodhouse return nfserrno(host_err); 197314f7dd63SDavid Woodhouse 197414f7dd63SDavid Woodhouse *offsetp = offset; 19752628b766SDavid Woodhouse return cdp->err; 19762628b766SDavid Woodhouse } 19772628b766SDavid Woodhouse 19781da177e4SLinus Torvalds /* 19791da177e4SLinus Torvalds * Read entries from a directory. 19801da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 19811da177e4SLinus Torvalds */ 19826264d69dSAl Viro __be32 19831da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 1984a0ad13efSNeilBrown struct readdir_cd *cdp, filldir_t func) 19851da177e4SLinus Torvalds { 19866264d69dSAl Viro __be32 err; 19871da177e4SLinus Torvalds struct file *file; 19881da177e4SLinus Torvalds loff_t offset = *offsetp; 19891da177e4SLinus Torvalds 19908837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file); 19911da177e4SLinus Torvalds if (err) 19921da177e4SLinus Torvalds goto out; 19931da177e4SLinus Torvalds 19941da177e4SLinus Torvalds offset = vfs_llseek(file, offset, 0); 19951da177e4SLinus Torvalds if (offset < 0) { 19961da177e4SLinus Torvalds err = nfserrno((int)offset); 19971da177e4SLinus Torvalds goto out_close; 19981da177e4SLinus Torvalds } 19991da177e4SLinus Torvalds 200014f7dd63SDavid Woodhouse err = nfsd_buffered_readdir(file, func, cdp, offsetp); 20011da177e4SLinus Torvalds 20021da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 20031da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 20041da177e4SLinus Torvalds out_close: 20051da177e4SLinus Torvalds nfsd_close(file); 20061da177e4SLinus Torvalds out: 20071da177e4SLinus Torvalds return err; 20081da177e4SLinus Torvalds } 20091da177e4SLinus Torvalds 20101da177e4SLinus Torvalds /* 20111da177e4SLinus Torvalds * Get file system stats 20121da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 20131da177e4SLinus Torvalds */ 20146264d69dSAl Viro __be32 201504716e66SJ. Bruce Fields nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) 20161da177e4SLinus Torvalds { 2017f6360efbSTakashi Iwai __be32 err; 2018f6360efbSTakashi Iwai 2019f6360efbSTakashi Iwai err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); 2020f6360efbSTakashi Iwai if (!err) { 2021ebabe9a9SChristoph Hellwig struct path path = { 2022ebabe9a9SChristoph Hellwig .mnt = fhp->fh_export->ex_path.mnt, 2023ebabe9a9SChristoph Hellwig .dentry = fhp->fh_dentry, 2024ebabe9a9SChristoph Hellwig }; 2025f6360efbSTakashi Iwai if (vfs_statfs(&path, stat)) 20261da177e4SLinus Torvalds err = nfserr_io; 2027f6360efbSTakashi Iwai } 20281da177e4SLinus Torvalds return err; 20291da177e4SLinus Torvalds } 20301da177e4SLinus Torvalds 2031c7d51402SJ. Bruce Fields static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) 2032e22841c6SJ. Bruce Fields { 2033c7d51402SJ. Bruce Fields return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; 2034e22841c6SJ. Bruce Fields } 2035e22841c6SJ. Bruce Fields 20361da177e4SLinus Torvalds /* 20371da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 20381da177e4SLinus Torvalds */ 20396264d69dSAl Viro __be32 20400ec757dfSJ. Bruce Fields nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, 20410ec757dfSJ. Bruce Fields struct dentry *dentry, int acc) 20421da177e4SLinus Torvalds { 20431da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 20441da177e4SLinus Torvalds int err; 20451da177e4SLinus Torvalds 2046aea93397SJ. Bruce Fields if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) 20471da177e4SLinus Torvalds return 0; 20481da177e4SLinus Torvalds #if 0 20491da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 20501da177e4SLinus Torvalds acc, 20518837abcaSMiklos Szeredi (acc & NFSD_MAY_READ)? " read" : "", 20528837abcaSMiklos Szeredi (acc & NFSD_MAY_WRITE)? " write" : "", 20538837abcaSMiklos Szeredi (acc & NFSD_MAY_EXEC)? " exec" : "", 20548837abcaSMiklos Szeredi (acc & NFSD_MAY_SATTR)? " sattr" : "", 20558837abcaSMiklos Szeredi (acc & NFSD_MAY_TRUNC)? " trunc" : "", 20568837abcaSMiklos Szeredi (acc & NFSD_MAY_LOCK)? " lock" : "", 20578837abcaSMiklos Szeredi (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", 20581da177e4SLinus Torvalds inode->i_mode, 20591da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 20601da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 20612c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); 20621da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 20635cc0a840SDavid Howells inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); 20641da177e4SLinus Torvalds #endif 20651da177e4SLinus Torvalds 20661da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 20671da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 20681da177e4SLinus Torvalds * device special file, we ignore rofs. 20691da177e4SLinus Torvalds */ 20708837abcaSMiklos Szeredi if (!(acc & NFSD_MAY_LOCAL_ACCESS)) 20718837abcaSMiklos Szeredi if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { 20722c463e95SDave Hansen if (exp_rdonly(rqstp, exp) || 20732c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)) 20741da177e4SLinus Torvalds return nfserr_rofs; 20758837abcaSMiklos Szeredi if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) 20761da177e4SLinus Torvalds return nfserr_perm; 20771da177e4SLinus Torvalds } 20788837abcaSMiklos Szeredi if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) 20791da177e4SLinus Torvalds return nfserr_perm; 20801da177e4SLinus Torvalds 20818837abcaSMiklos Szeredi if (acc & NFSD_MAY_LOCK) { 20821da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 20831da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 20841da177e4SLinus Torvalds * ownership 20851da177e4SLinus Torvalds */ 20861da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 20871da177e4SLinus Torvalds return 0; 20881da177e4SLinus Torvalds else 20898837abcaSMiklos Szeredi acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; 20901da177e4SLinus Torvalds } 20911da177e4SLinus Torvalds /* 20921da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 20931da177e4SLinus Torvalds * would normally be checked at open time. This is to make 20941da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 20951da177e4SLinus Torvalds * 20961da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 20971da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 20981da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 20991da177e4SLinus Torvalds * always implies file truncation. 21001da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 21011da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 21021da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 21031da177e4SLinus Torvalds * with NFSv3. 21041da177e4SLinus Torvalds */ 21058837abcaSMiklos Szeredi if ((acc & NFSD_MAY_OWNER_OVERRIDE) && 21065cc0a840SDavid Howells inode->i_uid == current_fsuid()) 21071da177e4SLinus Torvalds return 0; 21081da177e4SLinus Torvalds 21098837abcaSMiklos Szeredi /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ 2110f419a2e3SAl Viro err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); 21111da177e4SLinus Torvalds 21121da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 21131da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 21148837abcaSMiklos Szeredi acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE)) 2115f419a2e3SAl Viro err = inode_permission(inode, MAY_EXEC); 21161da177e4SLinus Torvalds 21171da177e4SLinus Torvalds return err? nfserrno(err) : 0; 21181da177e4SLinus Torvalds } 21191da177e4SLinus Torvalds 21201da177e4SLinus Torvalds void 21211da177e4SLinus Torvalds nfsd_racache_shutdown(void) 21221da177e4SLinus Torvalds { 212354a66e54SJeff Layton struct raparms *raparm, *last_raparm; 212454a66e54SJeff Layton unsigned int i; 212554a66e54SJeff Layton 21261da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 212754a66e54SJeff Layton 212854a66e54SJeff Layton for (i = 0; i < RAPARM_HASH_SIZE; i++) { 212954a66e54SJeff Layton raparm = raparm_hash[i].pb_head; 213054a66e54SJeff Layton while(raparm) { 213154a66e54SJeff Layton last_raparm = raparm; 213254a66e54SJeff Layton raparm = raparm->p_next; 213354a66e54SJeff Layton kfree(last_raparm); 213454a66e54SJeff Layton } 213554a66e54SJeff Layton raparm_hash[i].pb_head = NULL; 213654a66e54SJeff Layton } 21371da177e4SLinus Torvalds } 21381da177e4SLinus Torvalds /* 21391da177e4SLinus Torvalds * Initialize readahead param cache 21401da177e4SLinus Torvalds */ 21411da177e4SLinus Torvalds int 21421da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 21431da177e4SLinus Torvalds { 21441da177e4SLinus Torvalds int i; 2145fce1456aSGreg Banks int j = 0; 2146fce1456aSGreg Banks int nperbucket; 214754a66e54SJeff Layton struct raparms **raparm = NULL; 21481da177e4SLinus Torvalds 2149fce1456aSGreg Banks 215054a66e54SJeff Layton if (raparm_hash[0].pb_head) 21511da177e4SLinus Torvalds return 0; 215254a66e54SJeff Layton nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); 215354a66e54SJeff Layton if (nperbucket < 2) 215454a66e54SJeff Layton nperbucket = 2; 215554a66e54SJeff Layton cache_size = nperbucket * RAPARM_HASH_SIZE; 21564b3bb06bSYan Burman 21574b3bb06bSYan Burman dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); 215854a66e54SJeff Layton 2159fce1456aSGreg Banks for (i = 0; i < RAPARM_HASH_SIZE; i++) { 2160fce1456aSGreg Banks spin_lock_init(&raparm_hash[i].pb_lock); 216154a66e54SJeff Layton 216254a66e54SJeff Layton raparm = &raparm_hash[i].pb_head; 216354a66e54SJeff Layton for (j = 0; j < nperbucket; j++) { 216454a66e54SJeff Layton *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); 216554a66e54SJeff Layton if (!*raparm) 216654a66e54SJeff Layton goto out_nomem; 216754a66e54SJeff Layton raparm = &(*raparm)->p_next; 2168fce1456aSGreg Banks } 216954a66e54SJeff Layton *raparm = NULL; 21701da177e4SLinus Torvalds } 21714b3bb06bSYan Burman 21721da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 21731da177e4SLinus Torvalds return 0; 217454a66e54SJeff Layton 217554a66e54SJeff Layton out_nomem: 217654a66e54SJeff Layton dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); 217754a66e54SJeff Layton nfsd_racache_shutdown(); 217854a66e54SJeff Layton return -ENOMEM; 21791da177e4SLinus Torvalds } 2180a257cdd0SAndreas Gruenbacher 2181a257cdd0SAndreas Gruenbacher #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 2182a257cdd0SAndreas Gruenbacher struct posix_acl * 2183a257cdd0SAndreas Gruenbacher nfsd_get_posix_acl(struct svc_fh *fhp, int type) 2184a257cdd0SAndreas Gruenbacher { 2185a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2186a257cdd0SAndreas Gruenbacher char *name; 2187a257cdd0SAndreas Gruenbacher void *value = NULL; 2188a257cdd0SAndreas Gruenbacher ssize_t size; 2189a257cdd0SAndreas Gruenbacher struct posix_acl *acl; 2190a257cdd0SAndreas Gruenbacher 21915be196e5SChristoph Hellwig if (!IS_POSIXACL(inode)) 2192a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 21935be196e5SChristoph Hellwig 2194a257cdd0SAndreas Gruenbacher switch (type) { 2195a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2196334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2197a257cdd0SAndreas Gruenbacher break; 2198a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2199334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2200a257cdd0SAndreas Gruenbacher break; 2201a257cdd0SAndreas Gruenbacher default: 2202a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 2203a257cdd0SAndreas Gruenbacher } 2204a257cdd0SAndreas Gruenbacher 22055be196e5SChristoph Hellwig size = nfsd_getxattr(fhp->fh_dentry, name, &value); 22065be196e5SChristoph Hellwig if (size < 0) 22075be196e5SChristoph Hellwig return ERR_PTR(size); 2208a257cdd0SAndreas Gruenbacher 2209a257cdd0SAndreas Gruenbacher acl = posix_acl_from_xattr(value, size); 2210a257cdd0SAndreas Gruenbacher kfree(value); 2211a257cdd0SAndreas Gruenbacher return acl; 2212a257cdd0SAndreas Gruenbacher } 2213a257cdd0SAndreas Gruenbacher 2214a257cdd0SAndreas Gruenbacher int 2215a257cdd0SAndreas Gruenbacher nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) 2216a257cdd0SAndreas Gruenbacher { 2217a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2218a257cdd0SAndreas Gruenbacher char *name; 2219a257cdd0SAndreas Gruenbacher void *value = NULL; 2220a257cdd0SAndreas Gruenbacher size_t size; 2221a257cdd0SAndreas Gruenbacher int error; 2222a257cdd0SAndreas Gruenbacher 2223acfa4380SAl Viro if (!IS_POSIXACL(inode) || 2224a257cdd0SAndreas Gruenbacher !inode->i_op->setxattr || !inode->i_op->removexattr) 2225a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2226a257cdd0SAndreas Gruenbacher switch(type) { 2227a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2228334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2229a257cdd0SAndreas Gruenbacher break; 2230a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2231334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2232a257cdd0SAndreas Gruenbacher break; 2233a257cdd0SAndreas Gruenbacher default: 2234a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2235a257cdd0SAndreas Gruenbacher } 2236a257cdd0SAndreas Gruenbacher 2237a257cdd0SAndreas Gruenbacher if (acl && acl->a_count) { 2238334a13ecSChristoph Hellwig size = posix_acl_xattr_size(acl->a_count); 2239a257cdd0SAndreas Gruenbacher value = kmalloc(size, GFP_KERNEL); 2240a257cdd0SAndreas Gruenbacher if (!value) 2241a257cdd0SAndreas Gruenbacher return -ENOMEM; 22429ccfc29cSFlorin Malita error = posix_acl_to_xattr(acl, value, size); 22439ccfc29cSFlorin Malita if (error < 0) 2244a257cdd0SAndreas Gruenbacher goto getout; 22459ccfc29cSFlorin Malita size = error; 2246a257cdd0SAndreas Gruenbacher } else 2247a257cdd0SAndreas Gruenbacher size = 0; 2248a257cdd0SAndreas Gruenbacher 224918f335afSDave Hansen error = mnt_want_write(fhp->fh_export->ex_path.mnt); 225018f335afSDave Hansen if (error) 225118f335afSDave Hansen goto getout; 2252a257cdd0SAndreas Gruenbacher if (size) 22535be196e5SChristoph Hellwig error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); 2254a257cdd0SAndreas Gruenbacher else { 2255a257cdd0SAndreas Gruenbacher if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) 2256a257cdd0SAndreas Gruenbacher error = 0; 2257a257cdd0SAndreas Gruenbacher else { 22585be196e5SChristoph Hellwig error = vfs_removexattr(fhp->fh_dentry, name); 2259a257cdd0SAndreas Gruenbacher if (error == -ENODATA) 2260a257cdd0SAndreas Gruenbacher error = 0; 2261a257cdd0SAndreas Gruenbacher } 2262a257cdd0SAndreas Gruenbacher } 226318f335afSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 2264a257cdd0SAndreas Gruenbacher 2265a257cdd0SAndreas Gruenbacher getout: 2266a257cdd0SAndreas Gruenbacher kfree(value); 2267a257cdd0SAndreas Gruenbacher return error; 2268a257cdd0SAndreas Gruenbacher } 2269a257cdd0SAndreas Gruenbacher #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ 2270