11da177e4SLinus Torvalds #define MSNFS /* HACK HACK */ 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * File operations used by nfsd. Some of these have been ripped from 41da177e4SLinus Torvalds * other parts of the kernel because they weren't exported, others 51da177e4SLinus Torvalds * are partial duplicates with added or changed functionality. 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * Note that several functions dget() the dentry upon which they want 81da177e4SLinus Torvalds * to act, most notably those that create directory entries. Response 91da177e4SLinus Torvalds * dentry's are dput()'d if necessary in the release callback. 101da177e4SLinus Torvalds * So if you notice code paths that apparently fail to dput() the 111da177e4SLinus Torvalds * dentry, don't worry--they have been taken care of. 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> 141da177e4SLinus Torvalds * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> 151da177e4SLinus Torvalds */ 161da177e4SLinus Torvalds 171da177e4SLinus Torvalds #include <linux/fs.h> 181da177e4SLinus Torvalds #include <linux/file.h> 19d6b29d7cSJens Axboe #include <linux/splice.h> 201da177e4SLinus Torvalds #include <linux/fcntl.h> 211da177e4SLinus Torvalds #include <linux/namei.h> 221da177e4SLinus Torvalds #include <linux/delay.h> 230eeca283SRobert Love #include <linux/fsnotify.h> 241da177e4SLinus Torvalds #include <linux/posix_acl_xattr.h> 251da177e4SLinus Torvalds #include <linux/xattr.h> 269a74af21SBoaz Harrosh #include <linux/jhash.h> 279a74af21SBoaz Harrosh #include <linux/ima.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 371da177e4SLinus Torvalds #include <linux/nfs4_acl.h> 381da177e4SLinus Torvalds #include <linux/nfsd_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 909393bd07SAl Viro while (d_mountpoint(path.dentry) && follow_down(&path)) 9191c9fa8fSAl Viro ; 921da177e4SLinus Torvalds 9391c9fa8fSAl Viro exp2 = rqst_exp_get_by_name(rqstp, &path); 941da177e4SLinus Torvalds if (IS_ERR(exp2)) { 951da177e4SLinus Torvalds err = PTR_ERR(exp2); 963b6cee7bSJ. Bruce Fields /* 973b6cee7bSJ. Bruce Fields * We normally allow NFS clients to continue 983b6cee7bSJ. Bruce Fields * "underneath" a mountpoint that is not exported. 993b6cee7bSJ. Bruce Fields * The exception is V4ROOT, where no traversal is ever 1003b6cee7bSJ. Bruce Fields * allowed without an explicit export of the new 1013b6cee7bSJ. Bruce Fields * directory. 1023b6cee7bSJ. Bruce Fields */ 1033b6cee7bSJ. Bruce Fields if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) 1043b6cee7bSJ. Bruce Fields err = 0; 10591c9fa8fSAl Viro path_put(&path); 1061da177e4SLinus Torvalds goto out; 1071da177e4SLinus Torvalds } 1083c394ddaSSteve Dickson if (nfsd_v4client(rqstp) || 1093c394ddaSSteve Dickson (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { 1101da177e4SLinus Torvalds /* successfully crossed mount point */ 1111644ccc8SAl Viro /* 11291c9fa8fSAl Viro * This is subtle: path.dentry is *not* on path.mnt 11391c9fa8fSAl Viro * at this point. The only reason we are safe is that 11491c9fa8fSAl Viro * original mnt is pinned down by exp, so we should 11591c9fa8fSAl Viro * put path *before* putting exp 1161644ccc8SAl Viro */ 11791c9fa8fSAl Viro *dpp = path.dentry; 11891c9fa8fSAl Viro path.dentry = dentry; 1191644ccc8SAl Viro *expp = exp2; 12091c9fa8fSAl Viro exp2 = exp; 1211da177e4SLinus Torvalds } 12291c9fa8fSAl Viro path_put(&path); 12391c9fa8fSAl Viro exp_put(exp2); 1241da177e4SLinus Torvalds out: 1251da177e4SLinus Torvalds return err; 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 128289ede45SJ. Bruce Fields static void follow_to_parent(struct path *path) 129289ede45SJ. Bruce Fields { 130289ede45SJ. Bruce Fields struct dentry *dp; 131289ede45SJ. Bruce Fields 132289ede45SJ. Bruce Fields while (path->dentry == path->mnt->mnt_root && follow_up(path)) 133289ede45SJ. Bruce Fields ; 134289ede45SJ. Bruce Fields dp = dget_parent(path->dentry); 135289ede45SJ. Bruce Fields dput(path->dentry); 136289ede45SJ. Bruce Fields path->dentry = dp; 137289ede45SJ. Bruce Fields } 138289ede45SJ. Bruce Fields 139289ede45SJ. Bruce Fields static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) 140289ede45SJ. Bruce Fields { 141289ede45SJ. Bruce Fields struct svc_export *exp2; 142289ede45SJ. Bruce Fields struct path path = {.mnt = mntget((*exp)->ex_path.mnt), 143289ede45SJ. Bruce Fields .dentry = dget(dparent)}; 144289ede45SJ. Bruce Fields 145289ede45SJ. Bruce Fields follow_to_parent(&path); 146289ede45SJ. Bruce Fields 147289ede45SJ. Bruce Fields exp2 = rqst_exp_parent(rqstp, &path); 148289ede45SJ. Bruce Fields if (PTR_ERR(exp2) == -ENOENT) { 149289ede45SJ. Bruce Fields *dentryp = dget(dparent); 150289ede45SJ. Bruce Fields } else if (IS_ERR(exp2)) { 151289ede45SJ. Bruce Fields path_put(&path); 152289ede45SJ. Bruce Fields return PTR_ERR(exp2); 153289ede45SJ. Bruce Fields } else { 154289ede45SJ. Bruce Fields *dentryp = dget(path.dentry); 155289ede45SJ. Bruce Fields exp_put(*exp); 156289ede45SJ. Bruce Fields *exp = exp2; 157289ede45SJ. Bruce Fields } 158289ede45SJ. Bruce Fields path_put(&path); 159289ede45SJ. Bruce Fields return 0; 160289ede45SJ. Bruce Fields } 161289ede45SJ. Bruce Fields 16282ead7feSJ. Bruce Fields /* 16382ead7feSJ. Bruce Fields * For nfsd purposes, we treat V4ROOT exports as though there was an 16482ead7feSJ. Bruce Fields * export at *every* directory. 16582ead7feSJ. Bruce Fields */ 1663227fa41SJ. Bruce Fields int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) 16782ead7feSJ. Bruce Fields { 16882ead7feSJ. Bruce Fields if (d_mountpoint(dentry)) 16982ead7feSJ. Bruce Fields return 1; 17082ead7feSJ. Bruce Fields if (!(exp->ex_flags & NFSEXP_V4ROOT)) 17182ead7feSJ. Bruce Fields return 0; 17282ead7feSJ. Bruce Fields return dentry->d_inode != NULL; 17382ead7feSJ. Bruce Fields } 17482ead7feSJ. Bruce Fields 1756264d69dSAl Viro __be32 1766c0a654dSJ. Bruce Fields nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, 1775a022fc8SChuck Lever const char *name, unsigned int len, 1786c0a654dSJ. Bruce Fields struct svc_export **exp_ret, struct dentry **dentry_ret) 1791da177e4SLinus Torvalds { 1801da177e4SLinus Torvalds struct svc_export *exp; 1811da177e4SLinus Torvalds struct dentry *dparent; 1821da177e4SLinus Torvalds struct dentry *dentry; 1836264d69dSAl Viro __be32 err; 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 /* Obtain dentry and export. */ 1898837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); 1901da177e4SLinus Torvalds if (err) 1911da177e4SLinus Torvalds return err; 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds dparent = fhp->fh_dentry; 1941da177e4SLinus Torvalds exp = fhp->fh_export; 1951da177e4SLinus Torvalds exp_get(exp); 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds /* Lookup the name, but don't follow links */ 1981da177e4SLinus Torvalds if (isdotent(name, len)) { 1991da177e4SLinus Torvalds if (len==1) 2001da177e4SLinus Torvalds dentry = dget(dparent); 20154775491SJan Blunck else if (dparent != exp->ex_path.dentry) 2021da177e4SLinus Torvalds dentry = dget_parent(dparent); 203fed83811SJ. Bruce Fields else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) 2041da177e4SLinus Torvalds dentry = dget(dparent); /* .. == . just like at / */ 2051da177e4SLinus Torvalds else { 2061da177e4SLinus Torvalds /* checking mountpoint crossing is very different when stepping up */ 207289ede45SJ. Bruce Fields host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); 208289ede45SJ. Bruce Fields if (host_err) 2091da177e4SLinus Torvalds goto out_nfserr; 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds } else { 2121da177e4SLinus Torvalds fh_lock(fhp); 2131da177e4SLinus Torvalds dentry = lookup_one_len(name, dparent, len); 2146264d69dSAl Viro host_err = PTR_ERR(dentry); 2151da177e4SLinus Torvalds if (IS_ERR(dentry)) 2161da177e4SLinus Torvalds goto out_nfserr; 2171da177e4SLinus Torvalds /* 2181da177e4SLinus Torvalds * check if we have crossed a mount point ... 2191da177e4SLinus Torvalds */ 22082ead7feSJ. Bruce Fields if (nfsd_mountpoint(dentry, exp)) { 2216264d69dSAl Viro if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { 2221da177e4SLinus Torvalds dput(dentry); 2231da177e4SLinus Torvalds goto out_nfserr; 2241da177e4SLinus Torvalds } 2251da177e4SLinus Torvalds } 2261da177e4SLinus Torvalds } 2276c0a654dSJ. Bruce Fields *dentry_ret = dentry; 2286c0a654dSJ. Bruce Fields *exp_ret = exp; 2296c0a654dSJ. Bruce Fields return 0; 2306c0a654dSJ. Bruce Fields 2316c0a654dSJ. Bruce Fields out_nfserr: 2326c0a654dSJ. Bruce Fields exp_put(exp); 2336c0a654dSJ. Bruce Fields return nfserrno(host_err); 2346c0a654dSJ. Bruce Fields } 2356c0a654dSJ. Bruce Fields 2366c0a654dSJ. Bruce Fields /* 2376c0a654dSJ. Bruce Fields * Look up one component of a pathname. 2386c0a654dSJ. Bruce Fields * N.B. After this call _both_ fhp and resfh need an fh_put 2396c0a654dSJ. Bruce Fields * 2406c0a654dSJ. Bruce Fields * If the lookup would cross a mountpoint, and the mounted filesystem 2416c0a654dSJ. Bruce Fields * is exported to the client with NFSEXP_NOHIDE, then the lookup is 2426c0a654dSJ. Bruce Fields * accepted as it stands and the mounted directory is 2436c0a654dSJ. Bruce Fields * returned. Otherwise the covered directory is returned. 2446c0a654dSJ. Bruce Fields * NOTE: this mountpoint crossing is not supported properly by all 2456c0a654dSJ. Bruce Fields * clients and is explicitly disallowed for NFSv3 2466c0a654dSJ. Bruce Fields * NeilBrown <neilb@cse.unsw.edu.au> 2476c0a654dSJ. Bruce Fields */ 2486c0a654dSJ. Bruce Fields __be32 2496c0a654dSJ. Bruce Fields nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, 2505a022fc8SChuck Lever unsigned int len, struct svc_fh *resfh) 2516c0a654dSJ. Bruce Fields { 2526c0a654dSJ. Bruce Fields struct svc_export *exp; 2536c0a654dSJ. Bruce Fields struct dentry *dentry; 2546c0a654dSJ. Bruce Fields __be32 err; 2556c0a654dSJ. Bruce Fields 2566c0a654dSJ. Bruce Fields err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); 2576c0a654dSJ. Bruce Fields if (err) 2586c0a654dSJ. Bruce Fields return err; 25932c1eb0cSAndy Adamson err = check_nfsd_access(exp, rqstp); 26032c1eb0cSAndy Adamson if (err) 26132c1eb0cSAndy Adamson goto out; 2621da177e4SLinus Torvalds /* 2631da177e4SLinus Torvalds * Note: we compose the file handle now, but as the 2641da177e4SLinus Torvalds * dentry may be negative, it may need to be updated. 2651da177e4SLinus Torvalds */ 2661da177e4SLinus Torvalds err = fh_compose(resfh, exp, dentry, fhp); 2671da177e4SLinus Torvalds if (!err && !dentry->d_inode) 2681da177e4SLinus Torvalds err = nfserr_noent; 26932c1eb0cSAndy Adamson out: 2701da177e4SLinus Torvalds dput(dentry); 2711da177e4SLinus Torvalds exp_put(exp); 2721da177e4SLinus Torvalds return err; 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds 275f501912aSBen Myers /* 276f501912aSBen Myers * Commit metadata changes to stable storage. 277f501912aSBen Myers */ 278f501912aSBen Myers static int 279f501912aSBen Myers commit_metadata(struct svc_fh *fhp) 280f501912aSBen Myers { 281f501912aSBen Myers struct inode *inode = fhp->fh_dentry->d_inode; 282f501912aSBen Myers const struct export_operations *export_ops = inode->i_sb->s_export_op; 283f501912aSBen Myers int error = 0; 284f501912aSBen Myers 285f501912aSBen Myers if (!EX_ISSYNC(fhp->fh_export)) 286f501912aSBen Myers return 0; 287f501912aSBen Myers 288f501912aSBen Myers if (export_ops->commit_metadata) { 289f501912aSBen Myers error = export_ops->commit_metadata(inode); 290f501912aSBen Myers } else { 291f501912aSBen Myers struct writeback_control wbc = { 292f501912aSBen Myers .sync_mode = WB_SYNC_ALL, 293f501912aSBen Myers .nr_to_write = 0, /* metadata only */ 294f501912aSBen Myers }; 295f501912aSBen Myers 296f501912aSBen Myers error = sync_inode(inode, &wbc); 297f501912aSBen Myers } 298f501912aSBen Myers 299f501912aSBen Myers return error; 300f501912aSBen Myers } 3016c0a654dSJ. Bruce Fields 3021da177e4SLinus Torvalds /* 3031da177e4SLinus Torvalds * Set various file attributes. 3041da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 3051da177e4SLinus Torvalds */ 3066264d69dSAl Viro __be32 3071da177e4SLinus Torvalds nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, 3081da177e4SLinus Torvalds int check_guard, time_t guardtime) 3091da177e4SLinus Torvalds { 3101da177e4SLinus Torvalds struct dentry *dentry; 3111da177e4SLinus Torvalds struct inode *inode; 3128837abcaSMiklos Szeredi int accmode = NFSD_MAY_SATTR; 3131da177e4SLinus Torvalds int ftype = 0; 3146264d69dSAl Viro __be32 err; 3156264d69dSAl Viro int host_err; 3161da177e4SLinus Torvalds int size_change = 0; 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) 3198837abcaSMiklos Szeredi accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; 3201da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) 3211da177e4SLinus Torvalds ftype = S_IFREG; 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds /* Get inode */ 3241da177e4SLinus Torvalds err = fh_verify(rqstp, fhp, ftype, accmode); 32515b7a1b8SNeilBrown if (err) 3261da177e4SLinus Torvalds goto out; 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds dentry = fhp->fh_dentry; 3291da177e4SLinus Torvalds inode = dentry->d_inode; 3301da177e4SLinus Torvalds 33115b7a1b8SNeilBrown /* Ignore any mode updates on symlinks */ 33215b7a1b8SNeilBrown if (S_ISLNK(inode->i_mode)) 33315b7a1b8SNeilBrown iap->ia_valid &= ~ATTR_MODE; 33415b7a1b8SNeilBrown 33515b7a1b8SNeilBrown if (!iap->ia_valid) 33615b7a1b8SNeilBrown goto out; 33715b7a1b8SNeilBrown 3389c85fca5SChristoph Hellwig /* 3399c85fca5SChristoph Hellwig * NFSv2 does not differentiate between "set-[ac]time-to-now" 3401da177e4SLinus Torvalds * which only requires access, and "set-[ac]time-to-X" which 3411da177e4SLinus Torvalds * requires ownership. 3421da177e4SLinus Torvalds * So if it looks like it might be "set both to the same time which 3431da177e4SLinus Torvalds * is close to now", and if inode_change_ok fails, then we 3441da177e4SLinus Torvalds * convert to "set to now" instead of "set to explicit time" 3451da177e4SLinus Torvalds * 3461da177e4SLinus Torvalds * We only call inode_change_ok as the last test as technically 3471da177e4SLinus Torvalds * it is not an interface that we should be using. It is only 3481da177e4SLinus Torvalds * valid if the filesystem does not define it's own i_op->setattr. 3491da177e4SLinus Torvalds */ 3501da177e4SLinus Torvalds #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) 3511da177e4SLinus Torvalds #define MAX_TOUCH_TIME_ERROR (30*60) 3529c85fca5SChristoph Hellwig if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && 3539c85fca5SChristoph Hellwig iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { 3549c85fca5SChristoph Hellwig /* 3559c85fca5SChristoph Hellwig * Looks probable. 3569c85fca5SChristoph Hellwig * 3579c85fca5SChristoph Hellwig * Now just make sure time is in the right ballpark. 3589c85fca5SChristoph Hellwig * Solaris, at least, doesn't seem to care what the time 3599c85fca5SChristoph Hellwig * request is. We require it be within 30 minutes of now. 3601da177e4SLinus Torvalds */ 3611da177e4SLinus Torvalds time_t delta = iap->ia_atime.tv_sec - get_seconds(); 3629c85fca5SChristoph Hellwig if (delta < 0) 3639c85fca5SChristoph Hellwig delta = -delta; 3641da177e4SLinus Torvalds if (delta < MAX_TOUCH_TIME_ERROR && 3651da177e4SLinus Torvalds inode_change_ok(inode, iap) != 0) { 3669c85fca5SChristoph Hellwig /* 3679c85fca5SChristoph Hellwig * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. 3689c85fca5SChristoph Hellwig * This will cause notify_change to set these times 3699c85fca5SChristoph Hellwig * to "now" 3701da177e4SLinus Torvalds */ 3711da177e4SLinus Torvalds iap->ia_valid &= ~BOTH_TIME_SET; 3721da177e4SLinus Torvalds } 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds 3759c85fca5SChristoph Hellwig /* 3769c85fca5SChristoph Hellwig * The size case is special. 3779c85fca5SChristoph Hellwig * It changes the file as well as the attributes. 3789c85fca5SChristoph Hellwig */ 3791da177e4SLinus Torvalds if (iap->ia_valid & ATTR_SIZE) { 3801da177e4SLinus Torvalds if (iap->ia_size < inode->i_size) { 3818837abcaSMiklos Szeredi err = nfsd_permission(rqstp, fhp->fh_export, dentry, 3828837abcaSMiklos Szeredi NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE); 3831da177e4SLinus Torvalds if (err) 3841da177e4SLinus Torvalds goto out; 3851da177e4SLinus Torvalds } 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds /* 3881da177e4SLinus Torvalds * If we are changing the size of the file, then 3891da177e4SLinus Torvalds * we need to break all leases. 3901da177e4SLinus Torvalds */ 3918737c930SAl Viro host_err = break_lease(inode, O_WRONLY | O_NONBLOCK); 3926264d69dSAl Viro if (host_err == -EWOULDBLOCK) 3936264d69dSAl Viro host_err = -ETIMEDOUT; 3946264d69dSAl Viro if (host_err) /* ENOMEM or EWOULDBLOCK */ 3951da177e4SLinus Torvalds goto out_nfserr; 3961da177e4SLinus Torvalds 3976264d69dSAl Viro host_err = get_write_access(inode); 3986264d69dSAl Viro if (host_err) 3991da177e4SLinus Torvalds goto out_nfserr; 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds size_change = 1; 4026264d69dSAl Viro host_err = locks_verify_truncate(inode, NULL, iap->ia_size); 4036264d69dSAl Viro if (host_err) { 4041da177e4SLinus Torvalds put_write_access(inode); 4051da177e4SLinus Torvalds goto out_nfserr; 4061da177e4SLinus Torvalds } 4071da177e4SLinus Torvalds } 4081da177e4SLinus Torvalds 409ca456252SJeff Layton /* sanitize the mode change */ 4101da177e4SLinus Torvalds if (iap->ia_valid & ATTR_MODE) { 4111da177e4SLinus Torvalds iap->ia_mode &= S_IALLUGO; 412dee3209dSJeff Layton iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); 4131da177e4SLinus Torvalds } 414ca456252SJeff Layton 415ca456252SJeff Layton /* Revoke setuid/setgid on chown */ 4160953e620SSachin S. Prabhu if (!S_ISDIR(inode->i_mode) && 4170953e620SSachin S. Prabhu (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) || 4180953e620SSachin S. Prabhu ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) { 419ca456252SJeff Layton iap->ia_valid |= ATTR_KILL_PRIV; 420ca456252SJeff Layton if (iap->ia_valid & ATTR_MODE) { 421ca456252SJeff Layton /* we're setting mode too, just clear the s*id bits */ 422ca456252SJeff Layton iap->ia_mode &= ~S_ISUID; 423ca456252SJeff Layton if (iap->ia_mode & S_IXGRP) 4248a0ce7d9SJeff Layton iap->ia_mode &= ~S_ISGID; 4258a0ce7d9SJeff Layton } else { 426ca456252SJeff Layton /* set ATTR_KILL_* bits and let VFS handle it */ 427ca456252SJeff Layton iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); 428ca456252SJeff Layton } 4298a0ce7d9SJeff Layton } 4301da177e4SLinus Torvalds 4311da177e4SLinus Torvalds /* Change the attributes. */ 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds iap->ia_valid |= ATTR_CTIME; 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds err = nfserr_notsync; 4361da177e4SLinus Torvalds if (!check_guard || guardtime == inode->i_ctime.tv_sec) { 4371da177e4SLinus Torvalds fh_lock(fhp); 4386264d69dSAl Viro host_err = notify_change(dentry, iap); 4396264d69dSAl Viro err = nfserrno(host_err); 4401da177e4SLinus Torvalds fh_unlock(fhp); 4411da177e4SLinus Torvalds } 4421da177e4SLinus Torvalds if (size_change) 4431da177e4SLinus Torvalds put_write_access(inode); 4441da177e4SLinus Torvalds if (!err) 4451da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) 4461da177e4SLinus Torvalds write_inode_now(inode, 1); 4471da177e4SLinus Torvalds out: 4481da177e4SLinus Torvalds return err; 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds out_nfserr: 4516264d69dSAl Viro err = nfserrno(host_err); 4521da177e4SLinus Torvalds goto out; 4531da177e4SLinus Torvalds } 4541da177e4SLinus Torvalds 4555be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V2_ACL) || \ 4565be196e5SChristoph Hellwig defined(CONFIG_NFSD_V3_ACL) || \ 4575be196e5SChristoph Hellwig defined(CONFIG_NFSD_V4) 4585be196e5SChristoph Hellwig static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) 4595be196e5SChristoph Hellwig { 4605be196e5SChristoph Hellwig ssize_t buflen; 4616c6a426fSKrishna Kumar ssize_t ret; 4621da177e4SLinus Torvalds 4635be196e5SChristoph Hellwig buflen = vfs_getxattr(dentry, key, NULL, 0); 4645be196e5SChristoph Hellwig if (buflen <= 0) 4655be196e5SChristoph Hellwig return buflen; 4665be196e5SChristoph Hellwig 4675be196e5SChristoph Hellwig *buf = kmalloc(buflen, GFP_KERNEL); 4685be196e5SChristoph Hellwig if (!*buf) 4695be196e5SChristoph Hellwig return -ENOMEM; 4705be196e5SChristoph Hellwig 4716c6a426fSKrishna Kumar ret = vfs_getxattr(dentry, key, *buf, buflen); 4726c6a426fSKrishna Kumar if (ret < 0) 4736c6a426fSKrishna Kumar kfree(*buf); 4746c6a426fSKrishna Kumar return ret; 4755be196e5SChristoph Hellwig } 4765be196e5SChristoph Hellwig #endif 4775be196e5SChristoph Hellwig 4785be196e5SChristoph Hellwig #if defined(CONFIG_NFSD_V4) 4791da177e4SLinus Torvalds static int 4801da177e4SLinus Torvalds set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) 4811da177e4SLinus Torvalds { 4821da177e4SLinus Torvalds int len; 4831da177e4SLinus Torvalds size_t buflen; 4841da177e4SLinus Torvalds char *buf = NULL; 4851da177e4SLinus Torvalds int error = 0; 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds buflen = posix_acl_xattr_size(pacl->a_count); 4881da177e4SLinus Torvalds buf = kmalloc(buflen, GFP_KERNEL); 4891da177e4SLinus Torvalds error = -ENOMEM; 4901da177e4SLinus Torvalds if (buf == NULL) 4911da177e4SLinus Torvalds goto out; 4921da177e4SLinus Torvalds 4931da177e4SLinus Torvalds len = posix_acl_to_xattr(pacl, buf, buflen); 4941da177e4SLinus Torvalds if (len < 0) { 4951da177e4SLinus Torvalds error = len; 4961da177e4SLinus Torvalds goto out; 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds 4995be196e5SChristoph Hellwig error = vfs_setxattr(dentry, key, buf, len, 0); 5001da177e4SLinus Torvalds out: 5011da177e4SLinus Torvalds kfree(buf); 5021da177e4SLinus Torvalds return error; 5031da177e4SLinus Torvalds } 5041da177e4SLinus Torvalds 5056264d69dSAl Viro __be32 5061da177e4SLinus Torvalds nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, 5071da177e4SLinus Torvalds struct nfs4_acl *acl) 5081da177e4SLinus Torvalds { 5096264d69dSAl Viro __be32 error; 5106264d69dSAl Viro int host_error; 5111da177e4SLinus Torvalds struct dentry *dentry; 5121da177e4SLinus Torvalds struct inode *inode; 5131da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 5141da177e4SLinus Torvalds unsigned int flags = 0; 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds /* Get inode */ 5178837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); 5181da177e4SLinus Torvalds if (error) 5194b2ca38aSJ. Bruce Fields return error; 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds dentry = fhp->fh_dentry; 5221da177e4SLinus Torvalds inode = dentry->d_inode; 5231da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) 5241da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5251da177e4SLinus Torvalds 5266264d69dSAl Viro host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); 5276264d69dSAl Viro if (host_error == -EINVAL) { 5284b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 5296264d69dSAl Viro } else if (host_error < 0) 5301da177e4SLinus Torvalds goto out_nfserr; 5311da177e4SLinus Torvalds 5326264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); 5336264d69dSAl Viro if (host_error < 0) 5344b2ca38aSJ. Bruce Fields goto out_release; 5351da177e4SLinus Torvalds 5364b2ca38aSJ. Bruce Fields if (S_ISDIR(inode->i_mode)) 5376264d69dSAl Viro host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); 5381da177e4SLinus Torvalds 5394b2ca38aSJ. Bruce Fields out_release: 5401da177e4SLinus Torvalds posix_acl_release(pacl); 5411da177e4SLinus Torvalds posix_acl_release(dpacl); 5421da177e4SLinus Torvalds out_nfserr: 543f34f9242SJ. Bruce Fields if (host_error == -EOPNOTSUPP) 5444b2ca38aSJ. Bruce Fields return nfserr_attrnotsupp; 545f34f9242SJ. Bruce Fields else 5464b2ca38aSJ. Bruce Fields return nfserrno(host_error); 5471da177e4SLinus Torvalds } 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds static struct posix_acl * 5501da177e4SLinus Torvalds _get_posix_acl(struct dentry *dentry, char *key) 5511da177e4SLinus Torvalds { 5525be196e5SChristoph Hellwig void *buf = NULL; 5531da177e4SLinus Torvalds struct posix_acl *pacl = NULL; 5545be196e5SChristoph Hellwig int buflen; 5551da177e4SLinus Torvalds 5565be196e5SChristoph Hellwig buflen = nfsd_getxattr(dentry, key, &buf); 5575be196e5SChristoph Hellwig if (!buflen) 5585be196e5SChristoph Hellwig buflen = -ENODATA; 5595be196e5SChristoph Hellwig if (buflen <= 0) 5605be196e5SChristoph Hellwig return ERR_PTR(buflen); 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvalds pacl = posix_acl_from_xattr(buf, buflen); 5631da177e4SLinus Torvalds kfree(buf); 5641da177e4SLinus Torvalds return pacl; 5651da177e4SLinus Torvalds } 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds int 5681da177e4SLinus Torvalds nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) 5691da177e4SLinus Torvalds { 5701da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 5711da177e4SLinus Torvalds int error = 0; 5721da177e4SLinus Torvalds struct posix_acl *pacl = NULL, *dpacl = NULL; 5731da177e4SLinus Torvalds unsigned int flags = 0; 5741da177e4SLinus Torvalds 5759a59f452SChristoph Hellwig pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); 5761da177e4SLinus Torvalds if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) 5771da177e4SLinus Torvalds pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 5781da177e4SLinus Torvalds if (IS_ERR(pacl)) { 5791da177e4SLinus Torvalds error = PTR_ERR(pacl); 5801da177e4SLinus Torvalds pacl = NULL; 5811da177e4SLinus Torvalds goto out; 5821da177e4SLinus Torvalds } 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds if (S_ISDIR(inode->i_mode)) { 5859a59f452SChristoph Hellwig dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); 5861da177e4SLinus Torvalds if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) 5871da177e4SLinus Torvalds dpacl = NULL; 5881da177e4SLinus Torvalds else if (IS_ERR(dpacl)) { 5891da177e4SLinus Torvalds error = PTR_ERR(dpacl); 5901da177e4SLinus Torvalds dpacl = NULL; 5911da177e4SLinus Torvalds goto out; 5921da177e4SLinus Torvalds } 5931da177e4SLinus Torvalds flags = NFS4_ACL_DIR; 5941da177e4SLinus Torvalds } 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); 5971da177e4SLinus Torvalds if (IS_ERR(*acl)) { 5981da177e4SLinus Torvalds error = PTR_ERR(*acl); 5991da177e4SLinus Torvalds *acl = NULL; 6001da177e4SLinus Torvalds } 6011da177e4SLinus Torvalds out: 6021da177e4SLinus Torvalds posix_acl_release(pacl); 6031da177e4SLinus Torvalds posix_acl_release(dpacl); 6041da177e4SLinus Torvalds return error; 6051da177e4SLinus Torvalds } 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvalds #endif /* defined(CONFIG_NFS_V4) */ 6081da177e4SLinus Torvalds 6091da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 6101da177e4SLinus Torvalds /* 6111da177e4SLinus Torvalds * Check server access rights to a file system object 6121da177e4SLinus Torvalds */ 6131da177e4SLinus Torvalds struct accessmap { 6141da177e4SLinus Torvalds u32 access; 6151da177e4SLinus Torvalds int how; 6161da177e4SLinus Torvalds }; 6171da177e4SLinus Torvalds static struct accessmap nfs3_regaccess[] = { 6188837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6198837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6208837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, 6218837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds { 0, 0 } 6241da177e4SLinus Torvalds }; 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds static struct accessmap nfs3_diraccess[] = { 6278837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6288837abcaSMiklos Szeredi { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, 6298837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, 6308837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, 6318837abcaSMiklos Szeredi { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds { 0, 0 } 6341da177e4SLinus Torvalds }; 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds static struct accessmap nfs3_anyaccess[] = { 6371da177e4SLinus Torvalds /* Some clients - Solaris 2.6 at least, make an access call 6381da177e4SLinus Torvalds * to the server to check for access for things like /dev/null 6391da177e4SLinus Torvalds * (which really, the server doesn't care about). So 6401da177e4SLinus Torvalds * We provide simple access checking for them, looking 6411da177e4SLinus Torvalds * mainly at mode bits, and we make sure to ignore read-only 6421da177e4SLinus Torvalds * filesystem checks 6431da177e4SLinus Torvalds */ 6448837abcaSMiklos Szeredi { NFS3_ACCESS_READ, NFSD_MAY_READ }, 6458837abcaSMiklos Szeredi { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, 6468837abcaSMiklos Szeredi { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6478837abcaSMiklos Szeredi { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds { 0, 0 } 6501da177e4SLinus Torvalds }; 6511da177e4SLinus Torvalds 6526264d69dSAl Viro __be32 6531da177e4SLinus Torvalds nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) 6541da177e4SLinus Torvalds { 6551da177e4SLinus Torvalds struct accessmap *map; 6561da177e4SLinus Torvalds struct svc_export *export; 6571da177e4SLinus Torvalds struct dentry *dentry; 6581da177e4SLinus Torvalds u32 query, result = 0, sresult = 0; 6596264d69dSAl Viro __be32 error; 6601da177e4SLinus Torvalds 6618837abcaSMiklos Szeredi error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); 6621da177e4SLinus Torvalds if (error) 6631da177e4SLinus Torvalds goto out; 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds export = fhp->fh_export; 6661da177e4SLinus Torvalds dentry = fhp->fh_dentry; 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds if (S_ISREG(dentry->d_inode->i_mode)) 6691da177e4SLinus Torvalds map = nfs3_regaccess; 6701da177e4SLinus Torvalds else if (S_ISDIR(dentry->d_inode->i_mode)) 6711da177e4SLinus Torvalds map = nfs3_diraccess; 6721da177e4SLinus Torvalds else 6731da177e4SLinus Torvalds map = nfs3_anyaccess; 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds 6761da177e4SLinus Torvalds query = *access; 6771da177e4SLinus Torvalds for (; map->access; map++) { 6781da177e4SLinus Torvalds if (map->access & query) { 6796264d69dSAl Viro __be32 err2; 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds sresult |= map->access; 6821da177e4SLinus Torvalds 6830ec757dfSJ. Bruce Fields err2 = nfsd_permission(rqstp, export, dentry, map->how); 6841da177e4SLinus Torvalds switch (err2) { 6851da177e4SLinus Torvalds case nfs_ok: 6861da177e4SLinus Torvalds result |= map->access; 6871da177e4SLinus Torvalds break; 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvalds /* the following error codes just mean the access was not allowed, 6901da177e4SLinus Torvalds * rather than an error occurred */ 6911da177e4SLinus Torvalds case nfserr_rofs: 6921da177e4SLinus Torvalds case nfserr_acces: 6931da177e4SLinus Torvalds case nfserr_perm: 6941da177e4SLinus Torvalds /* simply don't "or" in the access bit. */ 6951da177e4SLinus Torvalds break; 6961da177e4SLinus Torvalds default: 6971da177e4SLinus Torvalds error = err2; 6981da177e4SLinus Torvalds goto out; 6991da177e4SLinus Torvalds } 7001da177e4SLinus Torvalds } 7011da177e4SLinus Torvalds } 7021da177e4SLinus Torvalds *access = result; 7031da177e4SLinus Torvalds if (supported) 7041da177e4SLinus Torvalds *supported = sresult; 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds out: 7071da177e4SLinus Torvalds return error; 7081da177e4SLinus Torvalds } 7091da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 7101da177e4SLinus Torvalds 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds 7131da177e4SLinus Torvalds /* 7141da177e4SLinus Torvalds * Open an existing file or directory. 7151da177e4SLinus Torvalds * The access argument indicates the type of open (read/write/lock) 7161da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 7171da177e4SLinus Torvalds */ 7186264d69dSAl Viro __be32 7191da177e4SLinus Torvalds nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 7201da177e4SLinus Torvalds int access, struct file **filp) 7211da177e4SLinus Torvalds { 7221da177e4SLinus Torvalds struct dentry *dentry; 7231da177e4SLinus Torvalds struct inode *inode; 7246264d69dSAl Viro int flags = O_RDONLY|O_LARGEFILE; 7256264d69dSAl Viro __be32 err; 726*91885258SJeff Layton int host_err = 0; 7271da177e4SLinus Torvalds 728e0e81739SDavid Howells validate_process_creds(); 729e0e81739SDavid Howells 7301da177e4SLinus Torvalds /* 7311da177e4SLinus Torvalds * If we get here, then the client has already done an "open", 7321da177e4SLinus Torvalds * and (hopefully) checked permission - so allow OWNER_OVERRIDE 7331da177e4SLinus Torvalds * in case a chmod has now revoked permission. 7341da177e4SLinus Torvalds */ 7358837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE); 7361da177e4SLinus Torvalds if (err) 7371da177e4SLinus Torvalds goto out; 7381da177e4SLinus Torvalds 7391da177e4SLinus Torvalds dentry = fhp->fh_dentry; 7401da177e4SLinus Torvalds inode = dentry->d_inode; 7411da177e4SLinus Torvalds 7421da177e4SLinus Torvalds /* Disallow write access to files with the append-only bit set 7431da177e4SLinus Torvalds * or any access when mandatory locking enabled 7441da177e4SLinus Torvalds */ 7451da177e4SLinus Torvalds err = nfserr_perm; 7468837abcaSMiklos Szeredi if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE)) 7471da177e4SLinus Torvalds goto out; 7485e7fc436SJ. Bruce Fields /* 7495e7fc436SJ. Bruce Fields * We must ignore files (but only files) which might have mandatory 7505e7fc436SJ. Bruce Fields * locks on them because there is no way to know if the accesser has 7515e7fc436SJ. Bruce Fields * the lock. 7525e7fc436SJ. Bruce Fields */ 7535e7fc436SJ. Bruce Fields if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) 7541da177e4SLinus Torvalds goto out; 7551da177e4SLinus Torvalds 7561da177e4SLinus Torvalds if (!inode->i_fop) 7571da177e4SLinus Torvalds goto out; 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds /* 7601da177e4SLinus Torvalds * Check to see if there are any leases on this file. 7611da177e4SLinus Torvalds * This may block while leases are broken. 7621da177e4SLinus Torvalds */ 763*91885258SJeff Layton if (!(access & NFSD_MAY_NOT_BREAK_LEASE)) 7648737c930SAl Viro host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? O_WRONLY : 0)); 7656264d69dSAl Viro if (host_err == -EWOULDBLOCK) 7666264d69dSAl Viro host_err = -ETIMEDOUT; 7676264d69dSAl Viro if (host_err) /* NOMEM or WOULDBLOCK */ 7681da177e4SLinus Torvalds goto out_nfserr; 7691da177e4SLinus Torvalds 7708837abcaSMiklos Szeredi if (access & NFSD_MAY_WRITE) { 7718837abcaSMiklos Szeredi if (access & NFSD_MAY_READ) 7729ecb6a08SJ. Bruce Fields flags = O_RDWR|O_LARGEFILE; 7739ecb6a08SJ. Bruce Fields else 7741da177e4SLinus Torvalds flags = O_WRONLY|O_LARGEFILE; 7751da177e4SLinus Torvalds } 77654775491SJan Blunck *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt), 777033a666cSDavid Howells flags, current_cred()); 7781da177e4SLinus Torvalds if (IS_ERR(*filp)) 7796264d69dSAl Viro host_err = PTR_ERR(*filp); 780aeaa5ccdSChuck Ebbert else 7819bbb6cadSMimi Zohar host_err = ima_file_check(*filp, access); 7821da177e4SLinus Torvalds out_nfserr: 7836264d69dSAl Viro err = nfserrno(host_err); 7841da177e4SLinus Torvalds out: 785e0e81739SDavid Howells validate_process_creds(); 7861da177e4SLinus Torvalds return err; 7871da177e4SLinus Torvalds } 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvalds /* 7901da177e4SLinus Torvalds * Close a file. 7911da177e4SLinus Torvalds */ 7921da177e4SLinus Torvalds void 7931da177e4SLinus Torvalds nfsd_close(struct file *filp) 7941da177e4SLinus Torvalds { 7951da177e4SLinus Torvalds fput(filp); 7961da177e4SLinus Torvalds } 7971da177e4SLinus Torvalds 7989a8d248eSJ. Bruce Fields /* 7991da177e4SLinus Torvalds * Obtain the readahead parameters for the file 8001da177e4SLinus Torvalds * specified by (dev, ino). 8011da177e4SLinus Torvalds */ 8021da177e4SLinus Torvalds 8031da177e4SLinus Torvalds static inline struct raparms * 8041da177e4SLinus Torvalds nfsd_get_raparms(dev_t dev, ino_t ino) 8051da177e4SLinus Torvalds { 8061da177e4SLinus Torvalds struct raparms *ra, **rap, **frap = NULL; 8071da177e4SLinus Torvalds int depth = 0; 808fce1456aSGreg Banks unsigned int hash; 809fce1456aSGreg Banks struct raparm_hbucket *rab; 8101da177e4SLinus Torvalds 811fce1456aSGreg Banks hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; 812fce1456aSGreg Banks rab = &raparm_hash[hash]; 813fce1456aSGreg Banks 814fce1456aSGreg Banks spin_lock(&rab->pb_lock); 815fce1456aSGreg Banks for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { 8161da177e4SLinus Torvalds if (ra->p_ino == ino && ra->p_dev == dev) 8171da177e4SLinus Torvalds goto found; 8181da177e4SLinus Torvalds depth++; 8191da177e4SLinus Torvalds if (ra->p_count == 0) 8201da177e4SLinus Torvalds frap = rap; 8211da177e4SLinus Torvalds } 8221da177e4SLinus Torvalds depth = nfsdstats.ra_size*11/10; 8231da177e4SLinus Torvalds if (!frap) { 824fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8251da177e4SLinus Torvalds return NULL; 8261da177e4SLinus Torvalds } 8271da177e4SLinus Torvalds rap = frap; 8281da177e4SLinus Torvalds ra = *frap; 8291da177e4SLinus Torvalds ra->p_dev = dev; 8301da177e4SLinus Torvalds ra->p_ino = ino; 8311da177e4SLinus Torvalds ra->p_set = 0; 832fce1456aSGreg Banks ra->p_hindex = hash; 8331da177e4SLinus Torvalds found: 834fce1456aSGreg Banks if (rap != &rab->pb_head) { 8351da177e4SLinus Torvalds *rap = ra->p_next; 836fce1456aSGreg Banks ra->p_next = rab->pb_head; 837fce1456aSGreg Banks rab->pb_head = ra; 8381da177e4SLinus Torvalds } 8391da177e4SLinus Torvalds ra->p_count++; 8401da177e4SLinus Torvalds nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; 841fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 8421da177e4SLinus Torvalds return ra; 8431da177e4SLinus Torvalds } 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvalds /* 846cf8208d0SJens Axboe * Grab and keep cached pages associated with a file in the svc_rqst 847cf8208d0SJens Axboe * so that they can be passed to the network sendmsg/sendpage routines 848cf8208d0SJens Axboe * directly. They will be released after the sending has completed. 8491da177e4SLinus Torvalds */ 8501da177e4SLinus Torvalds static int 851cf8208d0SJens Axboe nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, 852cf8208d0SJens Axboe struct splice_desc *sd) 8531da177e4SLinus Torvalds { 854cf8208d0SJens Axboe struct svc_rqst *rqstp = sd->u.data; 85544524359SNeilBrown struct page **pp = rqstp->rq_respages + rqstp->rq_resused; 856cf8208d0SJens Axboe struct page *page = buf->page; 857cf8208d0SJens Axboe size_t size; 858cf8208d0SJens Axboe int ret; 8591da177e4SLinus Torvalds 860cac36bb0SJens Axboe ret = buf->ops->confirm(pipe, buf); 861cf8208d0SJens Axboe if (unlikely(ret)) 862cf8208d0SJens Axboe return ret; 863cf8208d0SJens Axboe 864cf8208d0SJens Axboe size = sd->len; 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds if (rqstp->rq_res.page_len == 0) { 8671da177e4SLinus Torvalds get_page(page); 86844524359SNeilBrown put_page(*pp); 86944524359SNeilBrown *pp = page; 87044524359SNeilBrown rqstp->rq_resused++; 871cf8208d0SJens Axboe rqstp->rq_res.page_base = buf->offset; 8721da177e4SLinus Torvalds rqstp->rq_res.page_len = size; 87344524359SNeilBrown } else if (page != pp[-1]) { 8741da177e4SLinus Torvalds get_page(page); 875250f3915SNeilBrown if (*pp) 87644524359SNeilBrown put_page(*pp); 87744524359SNeilBrown *pp = page; 87844524359SNeilBrown rqstp->rq_resused++; 8791da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 88044524359SNeilBrown } else 8811da177e4SLinus Torvalds rqstp->rq_res.page_len += size; 8821da177e4SLinus Torvalds 8831da177e4SLinus Torvalds return size; 8841da177e4SLinus Torvalds } 8851da177e4SLinus Torvalds 886cf8208d0SJens Axboe static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, 887cf8208d0SJens Axboe struct splice_desc *sd) 888cf8208d0SJens Axboe { 889cf8208d0SJens Axboe return __splice_from_pipe(pipe, sd, nfsd_splice_actor); 890cf8208d0SJens Axboe } 891cf8208d0SJens Axboe 892a8754beeSDave Hansen static inline int svc_msnfs(struct svc_fh *ffhp) 893a8754beeSDave Hansen { 894a8754beeSDave Hansen #ifdef MSNFS 895a8754beeSDave Hansen return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS); 896a8754beeSDave Hansen #else 897a8754beeSDave Hansen return 0; 898a8754beeSDave Hansen #endif 899a8754beeSDave Hansen } 900a8754beeSDave Hansen 9016264d69dSAl Viro static __be32 9021da177e4SLinus Torvalds nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 9031da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, unsigned long *count) 9041da177e4SLinus Torvalds { 9051da177e4SLinus Torvalds struct inode *inode; 9061da177e4SLinus Torvalds struct raparms *ra; 9071da177e4SLinus Torvalds mm_segment_t oldfs; 9086264d69dSAl Viro __be32 err; 9096264d69dSAl Viro int host_err; 9101da177e4SLinus Torvalds 9111da177e4SLinus Torvalds err = nfserr_perm; 9127eaa36e2SJosef "Jeff" Sipek inode = file->f_path.dentry->d_inode; 913a8754beeSDave Hansen 914a8754beeSDave Hansen if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count)) 9151da177e4SLinus Torvalds goto out; 9161da177e4SLinus Torvalds 9171da177e4SLinus Torvalds /* Get readahead parameters */ 9181da177e4SLinus Torvalds ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); 9191da177e4SLinus Torvalds 9201da177e4SLinus Torvalds if (ra && ra->p_set) 9211da177e4SLinus Torvalds file->f_ra = ra->p_ra; 9221da177e4SLinus Torvalds 923cf8208d0SJens Axboe if (file->f_op->splice_read && rqstp->rq_splice_ok) { 924cf8208d0SJens Axboe struct splice_desc sd = { 925cf8208d0SJens Axboe .len = 0, 926cf8208d0SJens Axboe .total_len = *count, 927cf8208d0SJens Axboe .pos = offset, 928cf8208d0SJens Axboe .u.data = rqstp, 929cf8208d0SJens Axboe }; 930cf8208d0SJens Axboe 9314fbef206SJens Axboe rqstp->rq_resused = 1; 932cf8208d0SJens Axboe host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); 9331da177e4SLinus Torvalds } else { 9341da177e4SLinus Torvalds oldfs = get_fs(); 9351da177e4SLinus Torvalds set_fs(KERNEL_DS); 9366264d69dSAl Viro host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); 9371da177e4SLinus Torvalds set_fs(oldfs); 9381da177e4SLinus Torvalds } 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds /* Write back readahead params */ 9411da177e4SLinus Torvalds if (ra) { 942fce1456aSGreg Banks struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; 943fce1456aSGreg Banks spin_lock(&rab->pb_lock); 9441da177e4SLinus Torvalds ra->p_ra = file->f_ra; 9451da177e4SLinus Torvalds ra->p_set = 1; 9461da177e4SLinus Torvalds ra->p_count--; 947fce1456aSGreg Banks spin_unlock(&rab->pb_lock); 9481da177e4SLinus Torvalds } 9491da177e4SLinus Torvalds 9506264d69dSAl Viro if (host_err >= 0) { 9516264d69dSAl Viro nfsdstats.io_read += host_err; 9526264d69dSAl Viro *count = host_err; 9531da177e4SLinus Torvalds err = 0; 9547eaa36e2SJosef "Jeff" Sipek fsnotify_access(file->f_path.dentry); 9551da177e4SLinus Torvalds } else 9566264d69dSAl Viro err = nfserrno(host_err); 9571da177e4SLinus Torvalds out: 9581da177e4SLinus Torvalds return err; 9591da177e4SLinus Torvalds } 9601da177e4SLinus Torvalds 9619f708e40SNeil Brown static void kill_suid(struct dentry *dentry) 9629f708e40SNeil Brown { 9639f708e40SNeil Brown struct iattr ia; 964b5376771SSerge E. Hallyn ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; 9659f708e40SNeil Brown 9661b1dcc1bSJes Sorensen mutex_lock(&dentry->d_inode->i_mutex); 9679f708e40SNeil Brown notify_change(dentry, &ia); 9681b1dcc1bSJes Sorensen mutex_unlock(&dentry->d_inode->i_mutex); 9699f708e40SNeil Brown } 9709f708e40SNeil Brown 971d911df7bSJ. Bruce Fields /* 972d911df7bSJ. Bruce Fields * Gathered writes: If another process is currently writing to the file, 973d911df7bSJ. Bruce Fields * there's a high chance this is another nfsd (triggered by a bulk write 974d911df7bSJ. Bruce Fields * from a client's biod). Rather than syncing the file with each write 975d911df7bSJ. Bruce Fields * request, we sleep for 10 msec. 976d911df7bSJ. Bruce Fields * 977d911df7bSJ. Bruce Fields * I don't know if this roughly approximates C. Juszak's idea of 978d911df7bSJ. Bruce Fields * gathered writes, but it's a nice and simple solution (IMHO), and it 979d911df7bSJ. Bruce Fields * seems to work:-) 980d911df7bSJ. Bruce Fields * 981d911df7bSJ. Bruce Fields * Note: we do this only in the NFSv2 case, since v3 and higher have a 982d911df7bSJ. Bruce Fields * better tool (separate unstable writes and commits) for solving this 983d911df7bSJ. Bruce Fields * problem. 984d911df7bSJ. Bruce Fields */ 985d911df7bSJ. Bruce Fields static int wait_for_concurrent_writes(struct file *file) 986d911df7bSJ. Bruce Fields { 987d911df7bSJ. Bruce Fields struct inode *inode = file->f_path.dentry->d_inode; 988d911df7bSJ. Bruce Fields static ino_t last_ino; 989d911df7bSJ. Bruce Fields static dev_t last_dev; 990d911df7bSJ. Bruce Fields int err = 0; 991d911df7bSJ. Bruce Fields 992d911df7bSJ. Bruce Fields if (atomic_read(&inode->i_writecount) > 1 993d911df7bSJ. Bruce Fields || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { 994d911df7bSJ. Bruce Fields dprintk("nfsd: write defer %d\n", task_pid_nr(current)); 995d911df7bSJ. Bruce Fields msleep(10); 996d911df7bSJ. Bruce Fields dprintk("nfsd: write resume %d\n", task_pid_nr(current)); 997d911df7bSJ. Bruce Fields } 998d911df7bSJ. Bruce Fields 999d911df7bSJ. Bruce Fields if (inode->i_state & I_DIRTY) { 1000d911df7bSJ. Bruce Fields dprintk("nfsd: write sync %d\n", task_pid_nr(current)); 10016a68f89eSChristoph Hellwig err = vfs_fsync(file, file->f_path.dentry, 0); 1002d911df7bSJ. Bruce Fields } 1003d911df7bSJ. Bruce Fields last_ino = inode->i_ino; 1004d911df7bSJ. Bruce Fields last_dev = inode->i_sb->s_dev; 1005d911df7bSJ. Bruce Fields return err; 1006d911df7bSJ. Bruce Fields } 1007d911df7bSJ. Bruce Fields 10086264d69dSAl Viro static __be32 10091da177e4SLinus Torvalds nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10101da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 101131dec253SDavid Shaw unsigned long *cnt, int *stablep) 10121da177e4SLinus Torvalds { 10131da177e4SLinus Torvalds struct svc_export *exp; 10141da177e4SLinus Torvalds struct dentry *dentry; 10151da177e4SLinus Torvalds struct inode *inode; 10161da177e4SLinus Torvalds mm_segment_t oldfs; 10176264d69dSAl Viro __be32 err = 0; 10186264d69dSAl Viro int host_err; 10191da177e4SLinus Torvalds int stable = *stablep; 102048e03bc5STrond Myklebust int use_wgather; 10211da177e4SLinus Torvalds 102245bd3b3dSNeilBrown #ifdef MSNFS 10231da177e4SLinus Torvalds err = nfserr_perm; 10241da177e4SLinus Torvalds 10251da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 102631dec253SDavid Shaw (!lock_may_write(file->f_path.dentry->d_inode, offset, *cnt))) 10271da177e4SLinus Torvalds goto out; 10281da177e4SLinus Torvalds #endif 10291da177e4SLinus Torvalds 10307eaa36e2SJosef "Jeff" Sipek dentry = file->f_path.dentry; 10311da177e4SLinus Torvalds inode = dentry->d_inode; 10321da177e4SLinus Torvalds exp = fhp->fh_export; 10331da177e4SLinus Torvalds 10341da177e4SLinus Torvalds /* 10351da177e4SLinus Torvalds * Request sync writes if 10361da177e4SLinus Torvalds * - the sync export option has been set, or 10371da177e4SLinus Torvalds * - the client requested O_SYNC behavior (NFSv3 feature). 10381da177e4SLinus Torvalds * - The file system doesn't support fsync(). 103948e03bc5STrond Myklebust * When NFSv2 gathered writes have been configured for this volume, 10401da177e4SLinus Torvalds * flushing the data to disk is handled separately below. 10411da177e4SLinus Torvalds */ 104248e03bc5STrond Myklebust use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); 10431da177e4SLinus Torvalds 10443ba15148SHarvey Harrison if (!file->f_op->fsync) {/* COMMIT3 cannot work */ 10451da177e4SLinus Torvalds stable = 2; 10461da177e4SLinus Torvalds *stablep = 2; /* FILE_SYNC */ 10471da177e4SLinus Torvalds } 10481da177e4SLinus Torvalds 10491da177e4SLinus Torvalds if (!EX_ISSYNC(exp)) 10501da177e4SLinus Torvalds stable = 0; 105148e03bc5STrond Myklebust if (stable && !use_wgather) { 1052db1dd4d3SJonathan Corbet spin_lock(&file->f_lock); 10531da177e4SLinus Torvalds file->f_flags |= O_SYNC; 1054db1dd4d3SJonathan Corbet spin_unlock(&file->f_lock); 1055db1dd4d3SJonathan Corbet } 10561da177e4SLinus Torvalds 10571da177e4SLinus Torvalds /* Write the data. */ 10581da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 10596264d69dSAl Viro host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); 10601da177e4SLinus Torvalds set_fs(oldfs); 1061e4636d53SJ. Bruce Fields if (host_err < 0) 1062e4636d53SJ. Bruce Fields goto out_nfserr; 1063a0d24b29SWei Yongjun *cnt = host_err; 106431dec253SDavid Shaw nfsdstats.io_write += host_err; 10657eaa36e2SJosef "Jeff" Sipek fsnotify_modify(file->f_path.dentry); 10661da177e4SLinus Torvalds 10671da177e4SLinus Torvalds /* clear setuid/setgid flag after write */ 1068e4636d53SJ. Bruce Fields if (inode->i_mode & (S_ISUID | S_ISGID)) 10699f708e40SNeil Brown kill_suid(dentry); 10701da177e4SLinus Torvalds 1071e4636d53SJ. Bruce Fields if (stable && use_wgather) 1072d911df7bSJ. Bruce Fields host_err = wait_for_concurrent_writes(file); 10731da177e4SLinus Torvalds 1074e4636d53SJ. Bruce Fields out_nfserr: 10756264d69dSAl Viro dprintk("nfsd: write complete host_err=%d\n", host_err); 1076a0d24b29SWei Yongjun if (host_err >= 0) 10771da177e4SLinus Torvalds err = 0; 1078a0d24b29SWei Yongjun else 10796264d69dSAl Viro err = nfserrno(host_err); 10801da177e4SLinus Torvalds out: 10811da177e4SLinus Torvalds return err; 10821da177e4SLinus Torvalds } 10831da177e4SLinus Torvalds 10841da177e4SLinus Torvalds /* 10851da177e4SLinus Torvalds * Read data from a file. count must contain the requested read count 10861da177e4SLinus Torvalds * on entry. On return, *count contains the number of bytes actually read. 10871da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 10881da177e4SLinus Torvalds */ 10896264d69dSAl Viro __be32 10901da177e4SLinus Torvalds nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 10911da177e4SLinus Torvalds loff_t offset, struct kvec *vec, int vlen, 10921da177e4SLinus Torvalds unsigned long *count) 10931da177e4SLinus Torvalds { 10946264d69dSAl Viro __be32 err; 10951da177e4SLinus Torvalds 10961da177e4SLinus Torvalds if (file) { 10970ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 10988837abcaSMiklos Szeredi NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); 10991da177e4SLinus Torvalds if (err) 11001da177e4SLinus Torvalds goto out; 11011da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 11021da177e4SLinus Torvalds } else { 11038837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); 11041da177e4SLinus Torvalds if (err) 11051da177e4SLinus Torvalds goto out; 11061da177e4SLinus Torvalds err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); 11071da177e4SLinus Torvalds nfsd_close(file); 11081da177e4SLinus Torvalds } 11091da177e4SLinus Torvalds out: 11101da177e4SLinus Torvalds return err; 11111da177e4SLinus Torvalds } 11121da177e4SLinus Torvalds 11131da177e4SLinus Torvalds /* 11141da177e4SLinus Torvalds * Write data to a file. 11151da177e4SLinus Torvalds * The stable flag requests synchronous writes. 11161da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 11171da177e4SLinus Torvalds */ 11186264d69dSAl Viro __be32 11191da177e4SLinus Torvalds nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, 112031dec253SDavid Shaw loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, 11211da177e4SLinus Torvalds int *stablep) 11221da177e4SLinus Torvalds { 11236264d69dSAl Viro __be32 err = 0; 11241da177e4SLinus Torvalds 11251da177e4SLinus Torvalds if (file) { 11260ec757dfSJ. Bruce Fields err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, 11278837abcaSMiklos Szeredi NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); 11281da177e4SLinus Torvalds if (err) 11291da177e4SLinus Torvalds goto out; 11301da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, 11311da177e4SLinus Torvalds stablep); 11321da177e4SLinus Torvalds } else { 11338837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); 11341da177e4SLinus Torvalds if (err) 11351da177e4SLinus Torvalds goto out; 11361da177e4SLinus Torvalds 11371da177e4SLinus Torvalds if (cnt) 11381da177e4SLinus Torvalds err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, 11391da177e4SLinus Torvalds cnt, stablep); 11401da177e4SLinus Torvalds nfsd_close(file); 11411da177e4SLinus Torvalds } 11421da177e4SLinus Torvalds out: 11431da177e4SLinus Torvalds return err; 11441da177e4SLinus Torvalds } 11451da177e4SLinus Torvalds 11461da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 11471da177e4SLinus Torvalds /* 11481da177e4SLinus Torvalds * Commit all pending writes to stable storage. 1149aa696a6fSTrond Myklebust * 1150aa696a6fSTrond Myklebust * Note: we only guarantee that data that lies within the range specified 1151aa696a6fSTrond Myklebust * by the 'offset' and 'count' parameters will be synced. 11521da177e4SLinus Torvalds * 11531da177e4SLinus Torvalds * Unfortunately we cannot lock the file to make sure we return full WCC 11541da177e4SLinus Torvalds * data to the client, as locking happens lower down in the filesystem. 11551da177e4SLinus Torvalds */ 11566264d69dSAl Viro __be32 11571da177e4SLinus Torvalds nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, 11581da177e4SLinus Torvalds loff_t offset, unsigned long count) 11591da177e4SLinus Torvalds { 11601da177e4SLinus Torvalds struct file *file; 1161aa696a6fSTrond Myklebust loff_t end = LLONG_MAX; 1162aa696a6fSTrond Myklebust __be32 err = nfserr_inval; 11631da177e4SLinus Torvalds 1164aa696a6fSTrond Myklebust if (offset < 0) 1165aa696a6fSTrond Myklebust goto out; 1166aa696a6fSTrond Myklebust if (count != 0) { 1167aa696a6fSTrond Myklebust end = offset + (loff_t)count - 1; 1168aa696a6fSTrond Myklebust if (end < offset) 1169aa696a6fSTrond Myklebust goto out; 1170aa696a6fSTrond Myklebust } 11711da177e4SLinus Torvalds 1172*91885258SJeff Layton err = nfsd_open(rqstp, fhp, S_IFREG, 1173*91885258SJeff Layton NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file); 11748837abcaSMiklos Szeredi if (err) 1175aa696a6fSTrond Myklebust goto out; 11761da177e4SLinus Torvalds if (EX_ISSYNC(fhp->fh_export)) { 1177aa696a6fSTrond Myklebust int err2 = vfs_fsync_range(file, file->f_path.dentry, 1178aa696a6fSTrond Myklebust offset, end, 0); 1179aa696a6fSTrond Myklebust 1180aa696a6fSTrond Myklebust if (err2 != -EINVAL) 1181aa696a6fSTrond Myklebust err = nfserrno(err2); 1182aa696a6fSTrond Myklebust else 11831da177e4SLinus Torvalds err = nfserr_notsupp; 11841da177e4SLinus Torvalds } 11851da177e4SLinus Torvalds 11861da177e4SLinus Torvalds nfsd_close(file); 1187aa696a6fSTrond Myklebust out: 11881da177e4SLinus Torvalds return err; 11891da177e4SLinus Torvalds } 11901da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 11911da177e4SLinus Torvalds 1192f2b0dee2SAdrian Bunk static __be32 11935c002b3bSJ. Bruce Fields nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, 11945c002b3bSJ. Bruce Fields struct iattr *iap) 11955c002b3bSJ. Bruce Fields { 11965c002b3bSJ. Bruce Fields /* 11975c002b3bSJ. Bruce Fields * Mode has already been set earlier in create: 11985c002b3bSJ. Bruce Fields */ 11995c002b3bSJ. Bruce Fields iap->ia_valid &= ~ATTR_MODE; 12005c002b3bSJ. Bruce Fields /* 12015c002b3bSJ. Bruce Fields * Setting uid/gid works only for root. Irix appears to 12025c002b3bSJ. Bruce Fields * send along the gid on create when it tries to implement 12035c002b3bSJ. Bruce Fields * setgid directories via NFS: 12045c002b3bSJ. Bruce Fields */ 12055cc0a840SDavid Howells if (current_fsuid() != 0) 12065c002b3bSJ. Bruce Fields iap->ia_valid &= ~(ATTR_UID|ATTR_GID); 12075c002b3bSJ. Bruce Fields if (iap->ia_valid) 12085c002b3bSJ. Bruce Fields return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); 12095c002b3bSJ. Bruce Fields return 0; 12105c002b3bSJ. Bruce Fields } 12115c002b3bSJ. Bruce Fields 12124ac35c2fSwengang wang /* HPUX client sometimes creates a file in mode 000, and sets size to 0. 12134ac35c2fSwengang wang * setting size to 0 may fail for some specific file systems by the permission 12144ac35c2fSwengang wang * checking which requires WRITE permission but the mode is 000. 12154ac35c2fSwengang wang * we ignore the resizing(to 0) on the just new created file, since the size is 12164ac35c2fSwengang wang * 0 after file created. 12174ac35c2fSwengang wang * 12184ac35c2fSwengang wang * call this only after vfs_create() is called. 12194ac35c2fSwengang wang * */ 12204ac35c2fSwengang wang static void 12214ac35c2fSwengang wang nfsd_check_ignore_resizing(struct iattr *iap) 12224ac35c2fSwengang wang { 12234ac35c2fSwengang wang if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) 12244ac35c2fSwengang wang iap->ia_valid &= ~ATTR_SIZE; 12254ac35c2fSwengang wang } 12264ac35c2fSwengang wang 12271da177e4SLinus Torvalds /* 12281da177e4SLinus Torvalds * Create a file (regular, directory, device, fifo); UNIX sockets 12291da177e4SLinus Torvalds * not yet implemented. 12301da177e4SLinus Torvalds * If the response fh has been verified, the parent directory should 12311da177e4SLinus Torvalds * already be locked. Note that the parent directory is left locked. 12321da177e4SLinus Torvalds * 12331da177e4SLinus Torvalds * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp 12341da177e4SLinus Torvalds */ 12356264d69dSAl Viro __be32 12361da177e4SLinus Torvalds nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, 12371da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 12381da177e4SLinus Torvalds int type, dev_t rdev, struct svc_fh *resfhp) 12391da177e4SLinus Torvalds { 12401da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 12411da177e4SLinus Torvalds struct inode *dirp; 12426264d69dSAl Viro __be32 err; 12435c002b3bSJ. Bruce Fields __be32 err2; 12446264d69dSAl Viro int host_err; 12451da177e4SLinus Torvalds 12461da177e4SLinus Torvalds err = nfserr_perm; 12471da177e4SLinus Torvalds if (!flen) 12481da177e4SLinus Torvalds goto out; 12491da177e4SLinus Torvalds err = nfserr_exist; 12501da177e4SLinus Torvalds if (isdotent(fname, flen)) 12511da177e4SLinus Torvalds goto out; 12521da177e4SLinus Torvalds 12538837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 12541da177e4SLinus Torvalds if (err) 12551da177e4SLinus Torvalds goto out; 12561da177e4SLinus Torvalds 12571da177e4SLinus Torvalds dentry = fhp->fh_dentry; 12581da177e4SLinus Torvalds dirp = dentry->d_inode; 12591da177e4SLinus Torvalds 12601da177e4SLinus Torvalds err = nfserr_notdir; 1261acfa4380SAl Viro if (!dirp->i_op->lookup) 12621da177e4SLinus Torvalds goto out; 12631da177e4SLinus Torvalds /* 12641da177e4SLinus Torvalds * Check whether the response file handle has been verified yet. 12651da177e4SLinus Torvalds * If it has, the parent directory should already be locked. 12661da177e4SLinus Torvalds */ 12671da177e4SLinus Torvalds if (!resfhp->fh_dentry) { 12681da177e4SLinus Torvalds /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ 126912fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 12701da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 12716264d69dSAl Viro host_err = PTR_ERR(dchild); 12721da177e4SLinus Torvalds if (IS_ERR(dchild)) 12731da177e4SLinus Torvalds goto out_nfserr; 12741da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 12751da177e4SLinus Torvalds if (err) 12761da177e4SLinus Torvalds goto out; 12771da177e4SLinus Torvalds } else { 12781da177e4SLinus Torvalds /* called from nfsd_proc_create */ 12791da177e4SLinus Torvalds dchild = dget(resfhp->fh_dentry); 12801da177e4SLinus Torvalds if (!fhp->fh_locked) { 12811da177e4SLinus Torvalds /* not actually possible */ 12821da177e4SLinus Torvalds printk(KERN_ERR 12831da177e4SLinus Torvalds "nfsd_create: parent %s/%s not locked!\n", 12841da177e4SLinus Torvalds dentry->d_parent->d_name.name, 12851da177e4SLinus Torvalds dentry->d_name.name); 1286d75f2b9fSAl Viro err = nfserr_io; 12871da177e4SLinus Torvalds goto out; 12881da177e4SLinus Torvalds } 12891da177e4SLinus Torvalds } 12901da177e4SLinus Torvalds /* 12911da177e4SLinus Torvalds * Make sure the child dentry is still negative ... 12921da177e4SLinus Torvalds */ 12931da177e4SLinus Torvalds err = nfserr_exist; 12941da177e4SLinus Torvalds if (dchild->d_inode) { 12951da177e4SLinus Torvalds dprintk("nfsd_create: dentry %s/%s not negative!\n", 12961da177e4SLinus Torvalds dentry->d_name.name, dchild->d_name.name); 12971da177e4SLinus Torvalds goto out; 12981da177e4SLinus Torvalds } 12991da177e4SLinus Torvalds 13001da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 13011da177e4SLinus Torvalds iap->ia_mode = 0; 13021da177e4SLinus Torvalds iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; 13031da177e4SLinus Torvalds 130407cad1d2SMiklos Szeredi err = nfserr_inval; 130507cad1d2SMiklos Szeredi if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { 130607cad1d2SMiklos Szeredi printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", 130707cad1d2SMiklos Szeredi type); 130807cad1d2SMiklos Szeredi goto out; 130907cad1d2SMiklos Szeredi } 131007cad1d2SMiklos Szeredi 131107cad1d2SMiklos Szeredi host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 131207cad1d2SMiklos Szeredi if (host_err) 131307cad1d2SMiklos Szeredi goto out_nfserr; 131407cad1d2SMiklos Szeredi 13151da177e4SLinus Torvalds /* 13161da177e4SLinus Torvalds * Get the dir op function pointer. 13171da177e4SLinus Torvalds */ 1318088406bcSJ. Bruce Fields err = 0; 13191da177e4SLinus Torvalds switch (type) { 13201da177e4SLinus Torvalds case S_IFREG: 13216264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 13224ac35c2fSwengang wang if (!host_err) 13234ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 13241da177e4SLinus Torvalds break; 13251da177e4SLinus Torvalds case S_IFDIR: 13266264d69dSAl Viro host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); 13271da177e4SLinus Torvalds break; 13281da177e4SLinus Torvalds case S_IFCHR: 13291da177e4SLinus Torvalds case S_IFBLK: 13301da177e4SLinus Torvalds case S_IFIFO: 13311da177e4SLinus Torvalds case S_IFSOCK: 13326264d69dSAl Viro host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); 13331da177e4SLinus Torvalds break; 1334463c3197SDave Hansen } 1335463c3197SDave Hansen if (host_err < 0) { 1336463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1337463c3197SDave Hansen goto out_nfserr; 1338463c3197SDave Hansen } 13391da177e4SLinus Torvalds 1340f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 13411da177e4SLinus Torvalds 1342f501912aSBen Myers /* 1343f501912aSBen Myers * nfsd_setattr already committed the child. Transactional filesystems 1344f501912aSBen Myers * had a chance to commit changes for both parent and child 1345f501912aSBen Myers * simultaneously making the following commit_metadata a noop. 1346f501912aSBen Myers */ 1347f501912aSBen Myers err2 = nfserrno(commit_metadata(fhp)); 1348f193fbabSYAMAMOTO Takashi if (err2) 1349f193fbabSYAMAMOTO Takashi err = err2; 1350463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 13511da177e4SLinus Torvalds /* 13521da177e4SLinus Torvalds * Update the file handle to get the new inode info. 13531da177e4SLinus Torvalds */ 13541da177e4SLinus Torvalds if (!err) 13551da177e4SLinus Torvalds err = fh_update(resfhp); 13561da177e4SLinus Torvalds out: 13571da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 13581da177e4SLinus Torvalds dput(dchild); 13591da177e4SLinus Torvalds return err; 13601da177e4SLinus Torvalds 13611da177e4SLinus Torvalds out_nfserr: 13626264d69dSAl Viro err = nfserrno(host_err); 13631da177e4SLinus Torvalds goto out; 13641da177e4SLinus Torvalds } 13651da177e4SLinus Torvalds 13661da177e4SLinus Torvalds #ifdef CONFIG_NFSD_V3 13671da177e4SLinus Torvalds /* 13681da177e4SLinus Torvalds * NFSv3 version of nfsd_create 13691da177e4SLinus Torvalds */ 13706264d69dSAl Viro __be32 13711da177e4SLinus Torvalds nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, 13721da177e4SLinus Torvalds char *fname, int flen, struct iattr *iap, 13731da177e4SLinus Torvalds struct svc_fh *resfhp, int createmode, u32 *verifier, 137481ac95c5SJ. Bruce Fields int *truncp, int *created) 13751da177e4SLinus Torvalds { 13761da177e4SLinus Torvalds struct dentry *dentry, *dchild = NULL; 13771da177e4SLinus Torvalds struct inode *dirp; 13786264d69dSAl Viro __be32 err; 13796264d69dSAl Viro int host_err; 13801da177e4SLinus Torvalds __u32 v_mtime=0, v_atime=0; 13811da177e4SLinus Torvalds 13821da177e4SLinus Torvalds err = nfserr_perm; 13831da177e4SLinus Torvalds if (!flen) 13841da177e4SLinus Torvalds goto out; 13851da177e4SLinus Torvalds err = nfserr_exist; 13861da177e4SLinus Torvalds if (isdotent(fname, flen)) 13871da177e4SLinus Torvalds goto out; 13881da177e4SLinus Torvalds if (!(iap->ia_valid & ATTR_MODE)) 13891da177e4SLinus Torvalds iap->ia_mode = 0; 13908837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 13911da177e4SLinus Torvalds if (err) 13921da177e4SLinus Torvalds goto out; 13931da177e4SLinus Torvalds 13941da177e4SLinus Torvalds dentry = fhp->fh_dentry; 13951da177e4SLinus Torvalds dirp = dentry->d_inode; 13961da177e4SLinus Torvalds 13971da177e4SLinus Torvalds /* Get all the sanity checks out of the way before 13981da177e4SLinus Torvalds * we lock the parent. */ 13991da177e4SLinus Torvalds err = nfserr_notdir; 1400acfa4380SAl Viro if (!dirp->i_op->lookup) 14011da177e4SLinus Torvalds goto out; 140212fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 14031da177e4SLinus Torvalds 14041da177e4SLinus Torvalds /* 14051da177e4SLinus Torvalds * Compose the response file handle. 14061da177e4SLinus Torvalds */ 14071da177e4SLinus Torvalds dchild = lookup_one_len(fname, dentry, flen); 14086264d69dSAl Viro host_err = PTR_ERR(dchild); 14091da177e4SLinus Torvalds if (IS_ERR(dchild)) 14101da177e4SLinus Torvalds goto out_nfserr; 14111da177e4SLinus Torvalds 14121da177e4SLinus Torvalds err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); 14131da177e4SLinus Torvalds if (err) 14141da177e4SLinus Torvalds goto out; 14151da177e4SLinus Torvalds 14161da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1417c397852cSPeter Staubach /* solaris7 gets confused (bugid 4218508) if these have 1418749997e5SJeff Layton * the high bit set, so just clear the high bits. If this is 1419749997e5SJeff Layton * ever changed to use different attrs for storing the 1420749997e5SJeff Layton * verifier, then do_open_lookup() will also need to be fixed 1421749997e5SJeff Layton * accordingly. 14221da177e4SLinus Torvalds */ 14231da177e4SLinus Torvalds v_mtime = verifier[0]&0x7fffffff; 14241da177e4SLinus Torvalds v_atime = verifier[1]&0x7fffffff; 14251da177e4SLinus Torvalds } 14261da177e4SLinus Torvalds 1427463c3197SDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 1428463c3197SDave Hansen if (host_err) 1429463c3197SDave Hansen goto out_nfserr; 14301da177e4SLinus Torvalds if (dchild->d_inode) { 14311da177e4SLinus Torvalds err = 0; 14321da177e4SLinus Torvalds 14331da177e4SLinus Torvalds switch (createmode) { 14341da177e4SLinus Torvalds case NFS3_CREATE_UNCHECKED: 14351da177e4SLinus Torvalds if (! S_ISREG(dchild->d_inode->i_mode)) 14361da177e4SLinus Torvalds err = nfserr_exist; 14371da177e4SLinus Torvalds else if (truncp) { 14381da177e4SLinus Torvalds /* in nfsv4, we need to treat this case a little 14391da177e4SLinus Torvalds * differently. we don't want to truncate the 14401da177e4SLinus Torvalds * file now; this would be wrong if the OPEN 14411da177e4SLinus Torvalds * fails for some other reason. furthermore, 14421da177e4SLinus Torvalds * if the size is nonzero, we should ignore it 14431da177e4SLinus Torvalds * according to spec! 14441da177e4SLinus Torvalds */ 14451da177e4SLinus Torvalds *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; 14461da177e4SLinus Torvalds } 14471da177e4SLinus Torvalds else { 14481da177e4SLinus Torvalds iap->ia_valid &= ATTR_SIZE; 14491da177e4SLinus Torvalds goto set_attr; 14501da177e4SLinus Torvalds } 14511da177e4SLinus Torvalds break; 14521da177e4SLinus Torvalds case NFS3_CREATE_EXCLUSIVE: 14531da177e4SLinus Torvalds if ( dchild->d_inode->i_mtime.tv_sec == v_mtime 14541da177e4SLinus Torvalds && dchild->d_inode->i_atime.tv_sec == v_atime 14551da177e4SLinus Torvalds && dchild->d_inode->i_size == 0 ) 14561da177e4SLinus Torvalds break; 14571da177e4SLinus Torvalds /* fallthru */ 14581da177e4SLinus Torvalds case NFS3_CREATE_GUARDED: 14591da177e4SLinus Torvalds err = nfserr_exist; 14601da177e4SLinus Torvalds } 1461463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14621da177e4SLinus Torvalds goto out; 14631da177e4SLinus Torvalds } 14641da177e4SLinus Torvalds 14656264d69dSAl Viro host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); 1466463c3197SDave Hansen if (host_err < 0) { 1467463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 14681da177e4SLinus Torvalds goto out_nfserr; 1469463c3197SDave Hansen } 147081ac95c5SJ. Bruce Fields if (created) 147181ac95c5SJ. Bruce Fields *created = 1; 14721da177e4SLinus Torvalds 14734ac35c2fSwengang wang nfsd_check_ignore_resizing(iap); 14744ac35c2fSwengang wang 14751da177e4SLinus Torvalds if (createmode == NFS3_CREATE_EXCLUSIVE) { 1476c397852cSPeter Staubach /* Cram the verifier into atime/mtime */ 14771da177e4SLinus Torvalds iap->ia_valid = ATTR_MTIME|ATTR_ATIME 1478c397852cSPeter Staubach | ATTR_MTIME_SET|ATTR_ATIME_SET; 14791da177e4SLinus Torvalds /* XXX someone who knows this better please fix it for nsec */ 14801da177e4SLinus Torvalds iap->ia_mtime.tv_sec = v_mtime; 14811da177e4SLinus Torvalds iap->ia_atime.tv_sec = v_atime; 14821da177e4SLinus Torvalds iap->ia_mtime.tv_nsec = 0; 14831da177e4SLinus Torvalds iap->ia_atime.tv_nsec = 0; 14841da177e4SLinus Torvalds } 14851da177e4SLinus Torvalds 14861da177e4SLinus Torvalds set_attr: 1487f501912aSBen Myers err = nfsd_create_setattr(rqstp, resfhp, iap); 1488f501912aSBen Myers 1489f501912aSBen Myers /* 1490f501912aSBen Myers * nfsd_setattr already committed the child (and possibly also the parent). 1491f501912aSBen Myers */ 1492f501912aSBen Myers if (!err) 1493f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 1494f193fbabSYAMAMOTO Takashi 1495463c3197SDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 1496f193fbabSYAMAMOTO Takashi /* 1497f193fbabSYAMAMOTO Takashi * Update the filehandle to get the new inode info. 1498f193fbabSYAMAMOTO Takashi */ 1499f193fbabSYAMAMOTO Takashi if (!err) 1500f193fbabSYAMAMOTO Takashi err = fh_update(resfhp); 15011da177e4SLinus Torvalds 15021da177e4SLinus Torvalds out: 15031da177e4SLinus Torvalds fh_unlock(fhp); 15041da177e4SLinus Torvalds if (dchild && !IS_ERR(dchild)) 15051da177e4SLinus Torvalds dput(dchild); 15061da177e4SLinus Torvalds return err; 15071da177e4SLinus Torvalds 15081da177e4SLinus Torvalds out_nfserr: 15096264d69dSAl Viro err = nfserrno(host_err); 15101da177e4SLinus Torvalds goto out; 15111da177e4SLinus Torvalds } 15121da177e4SLinus Torvalds #endif /* CONFIG_NFSD_V3 */ 15131da177e4SLinus Torvalds 15141da177e4SLinus Torvalds /* 15151da177e4SLinus Torvalds * Read a symlink. On entry, *lenp must contain the maximum path length that 15161da177e4SLinus Torvalds * fits into the buffer. On return, it contains the true length. 15171da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 15181da177e4SLinus Torvalds */ 15196264d69dSAl Viro __be32 15201da177e4SLinus Torvalds nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) 15211da177e4SLinus Torvalds { 15221da177e4SLinus Torvalds struct dentry *dentry; 15231da177e4SLinus Torvalds struct inode *inode; 15241da177e4SLinus Torvalds mm_segment_t oldfs; 15256264d69dSAl Viro __be32 err; 15266264d69dSAl Viro int host_err; 15271da177e4SLinus Torvalds 15288837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); 15291da177e4SLinus Torvalds if (err) 15301da177e4SLinus Torvalds goto out; 15311da177e4SLinus Torvalds 15321da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15331da177e4SLinus Torvalds inode = dentry->d_inode; 15341da177e4SLinus Torvalds 15351da177e4SLinus Torvalds err = nfserr_inval; 1536acfa4380SAl Viro if (!inode->i_op->readlink) 15371da177e4SLinus Torvalds goto out; 15381da177e4SLinus Torvalds 153954775491SJan Blunck touch_atime(fhp->fh_export->ex_path.mnt, dentry); 15401da177e4SLinus Torvalds /* N.B. Why does this call need a get_fs()?? 15411da177e4SLinus Torvalds * Remove the set_fs and watch the fireworks:-) --okir 15421da177e4SLinus Torvalds */ 15431da177e4SLinus Torvalds 15441da177e4SLinus Torvalds oldfs = get_fs(); set_fs(KERNEL_DS); 15456264d69dSAl Viro host_err = inode->i_op->readlink(dentry, buf, *lenp); 15461da177e4SLinus Torvalds set_fs(oldfs); 15471da177e4SLinus Torvalds 15486264d69dSAl Viro if (host_err < 0) 15491da177e4SLinus Torvalds goto out_nfserr; 15506264d69dSAl Viro *lenp = host_err; 15511da177e4SLinus Torvalds err = 0; 15521da177e4SLinus Torvalds out: 15531da177e4SLinus Torvalds return err; 15541da177e4SLinus Torvalds 15551da177e4SLinus Torvalds out_nfserr: 15566264d69dSAl Viro err = nfserrno(host_err); 15571da177e4SLinus Torvalds goto out; 15581da177e4SLinus Torvalds } 15591da177e4SLinus Torvalds 15601da177e4SLinus Torvalds /* 15611da177e4SLinus Torvalds * Create a symlink and look up its inode 15621da177e4SLinus Torvalds * N.B. After this call _both_ fhp and resfhp need an fh_put 15631da177e4SLinus Torvalds */ 15646264d69dSAl Viro __be32 15651da177e4SLinus Torvalds nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, 15661da177e4SLinus Torvalds char *fname, int flen, 15671da177e4SLinus Torvalds char *path, int plen, 15681da177e4SLinus Torvalds struct svc_fh *resfhp, 15691da177e4SLinus Torvalds struct iattr *iap) 15701da177e4SLinus Torvalds { 15711da177e4SLinus Torvalds struct dentry *dentry, *dnew; 15726264d69dSAl Viro __be32 err, cerr; 15736264d69dSAl Viro int host_err; 15741da177e4SLinus Torvalds 15751da177e4SLinus Torvalds err = nfserr_noent; 15761da177e4SLinus Torvalds if (!flen || !plen) 15771da177e4SLinus Torvalds goto out; 15781da177e4SLinus Torvalds err = nfserr_exist; 15791da177e4SLinus Torvalds if (isdotent(fname, flen)) 15801da177e4SLinus Torvalds goto out; 15811da177e4SLinus Torvalds 15828837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); 15831da177e4SLinus Torvalds if (err) 15841da177e4SLinus Torvalds goto out; 15851da177e4SLinus Torvalds fh_lock(fhp); 15861da177e4SLinus Torvalds dentry = fhp->fh_dentry; 15871da177e4SLinus Torvalds dnew = lookup_one_len(fname, dentry, flen); 15886264d69dSAl Viro host_err = PTR_ERR(dnew); 15891da177e4SLinus Torvalds if (IS_ERR(dnew)) 15901da177e4SLinus Torvalds goto out_nfserr; 15911da177e4SLinus Torvalds 159275c3f29dSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 159375c3f29dSDave Hansen if (host_err) 159475c3f29dSDave Hansen goto out_nfserr; 159575c3f29dSDave Hansen 15961da177e4SLinus Torvalds if (unlikely(path[plen] != 0)) { 15971da177e4SLinus Torvalds char *path_alloced = kmalloc(plen+1, GFP_KERNEL); 15981da177e4SLinus Torvalds if (path_alloced == NULL) 15996264d69dSAl Viro host_err = -ENOMEM; 16001da177e4SLinus Torvalds else { 16011da177e4SLinus Torvalds strncpy(path_alloced, path, plen); 16021da177e4SLinus Torvalds path_alloced[plen] = 0; 1603db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); 16041da177e4SLinus Torvalds kfree(path_alloced); 16051da177e4SLinus Torvalds } 16061da177e4SLinus Torvalds } else 1607db2e747bSMiklos Szeredi host_err = vfs_symlink(dentry->d_inode, dnew, path); 16086264d69dSAl Viro err = nfserrno(host_err); 1609f501912aSBen Myers if (!err) 1610f501912aSBen Myers err = nfserrno(commit_metadata(fhp)); 16111da177e4SLinus Torvalds fh_unlock(fhp); 16121da177e4SLinus Torvalds 161375c3f29dSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 161475c3f29dSDave Hansen 16151da177e4SLinus Torvalds cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); 16161da177e4SLinus Torvalds dput(dnew); 16171da177e4SLinus Torvalds if (err==0) err = cerr; 16181da177e4SLinus Torvalds out: 16191da177e4SLinus Torvalds return err; 16201da177e4SLinus Torvalds 16211da177e4SLinus Torvalds out_nfserr: 16226264d69dSAl Viro err = nfserrno(host_err); 16231da177e4SLinus Torvalds goto out; 16241da177e4SLinus Torvalds } 16251da177e4SLinus Torvalds 16261da177e4SLinus Torvalds /* 16271da177e4SLinus Torvalds * Create a hardlink 16281da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16291da177e4SLinus Torvalds */ 16306264d69dSAl Viro __be32 16311da177e4SLinus Torvalds nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, 16321da177e4SLinus Torvalds char *name, int len, struct svc_fh *tfhp) 16331da177e4SLinus Torvalds { 16341da177e4SLinus Torvalds struct dentry *ddir, *dnew, *dold; 16351da177e4SLinus Torvalds struct inode *dirp, *dest; 16366264d69dSAl Viro __be32 err; 16376264d69dSAl Viro int host_err; 16381da177e4SLinus Torvalds 16398837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); 16401da177e4SLinus Torvalds if (err) 16411da177e4SLinus Torvalds goto out; 16428837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP); 16431da177e4SLinus Torvalds if (err) 16441da177e4SLinus Torvalds goto out; 16451da177e4SLinus Torvalds 16461da177e4SLinus Torvalds err = nfserr_perm; 16471da177e4SLinus Torvalds if (!len) 16481da177e4SLinus Torvalds goto out; 16491da177e4SLinus Torvalds err = nfserr_exist; 16501da177e4SLinus Torvalds if (isdotent(name, len)) 16511da177e4SLinus Torvalds goto out; 16521da177e4SLinus Torvalds 165312fd3520SPeter Zijlstra fh_lock_nested(ffhp, I_MUTEX_PARENT); 16541da177e4SLinus Torvalds ddir = ffhp->fh_dentry; 16551da177e4SLinus Torvalds dirp = ddir->d_inode; 16561da177e4SLinus Torvalds 16571da177e4SLinus Torvalds dnew = lookup_one_len(name, ddir, len); 16586264d69dSAl Viro host_err = PTR_ERR(dnew); 16591da177e4SLinus Torvalds if (IS_ERR(dnew)) 16601da177e4SLinus Torvalds goto out_nfserr; 16611da177e4SLinus Torvalds 16621da177e4SLinus Torvalds dold = tfhp->fh_dentry; 16631da177e4SLinus Torvalds dest = dold->d_inode; 16641da177e4SLinus Torvalds 166575c3f29dSDave Hansen host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt); 166675c3f29dSDave Hansen if (host_err) { 166775c3f29dSDave Hansen err = nfserrno(host_err); 166875c3f29dSDave Hansen goto out_dput; 166975c3f29dSDave Hansen } 16706264d69dSAl Viro host_err = vfs_link(dold, dirp, dnew); 16716264d69dSAl Viro if (!host_err) { 1672f501912aSBen Myers err = nfserrno(commit_metadata(ffhp)); 1673f501912aSBen Myers if (!err) 1674f501912aSBen Myers err = nfserrno(commit_metadata(tfhp)); 16751da177e4SLinus Torvalds } else { 16766264d69dSAl Viro if (host_err == -EXDEV && rqstp->rq_vers == 2) 16771da177e4SLinus Torvalds err = nfserr_acces; 16781da177e4SLinus Torvalds else 16796264d69dSAl Viro err = nfserrno(host_err); 16801da177e4SLinus Torvalds } 168175c3f29dSDave Hansen mnt_drop_write(tfhp->fh_export->ex_path.mnt); 168275c3f29dSDave Hansen out_dput: 16831da177e4SLinus Torvalds dput(dnew); 1684270d56e5SDavid M. Richter out_unlock: 1685270d56e5SDavid M. Richter fh_unlock(ffhp); 16861da177e4SLinus Torvalds out: 16871da177e4SLinus Torvalds return err; 16881da177e4SLinus Torvalds 16891da177e4SLinus Torvalds out_nfserr: 16906264d69dSAl Viro err = nfserrno(host_err); 1691270d56e5SDavid M. Richter goto out_unlock; 16921da177e4SLinus Torvalds } 16931da177e4SLinus Torvalds 16941da177e4SLinus Torvalds /* 16951da177e4SLinus Torvalds * Rename a file 16961da177e4SLinus Torvalds * N.B. After this call _both_ ffhp and tfhp need an fh_put 16971da177e4SLinus Torvalds */ 16986264d69dSAl Viro __be32 16991da177e4SLinus Torvalds nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, 17001da177e4SLinus Torvalds struct svc_fh *tfhp, char *tname, int tlen) 17011da177e4SLinus Torvalds { 17021da177e4SLinus Torvalds struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; 17031da177e4SLinus Torvalds struct inode *fdir, *tdir; 17046264d69dSAl Viro __be32 err; 17056264d69dSAl Viro int host_err; 17061da177e4SLinus Torvalds 17078837abcaSMiklos Szeredi err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); 17081da177e4SLinus Torvalds if (err) 17091da177e4SLinus Torvalds goto out; 17108837abcaSMiklos Szeredi err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); 17111da177e4SLinus Torvalds if (err) 17121da177e4SLinus Torvalds goto out; 17131da177e4SLinus Torvalds 17141da177e4SLinus Torvalds fdentry = ffhp->fh_dentry; 17151da177e4SLinus Torvalds fdir = fdentry->d_inode; 17161da177e4SLinus Torvalds 17171da177e4SLinus Torvalds tdentry = tfhp->fh_dentry; 17181da177e4SLinus Torvalds tdir = tdentry->d_inode; 17191da177e4SLinus Torvalds 17201da177e4SLinus Torvalds err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; 1721a56f3937SNeilBrown if (ffhp->fh_export != tfhp->fh_export) 17221da177e4SLinus Torvalds goto out; 17231da177e4SLinus Torvalds 17241da177e4SLinus Torvalds err = nfserr_perm; 17251da177e4SLinus Torvalds if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) 17261da177e4SLinus Torvalds goto out; 17271da177e4SLinus Torvalds 17281da177e4SLinus Torvalds /* cannot use fh_lock as we need deadlock protective ordering 17291da177e4SLinus Torvalds * so do it by hand */ 17301da177e4SLinus Torvalds trap = lock_rename(tdentry, fdentry); 17311da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 1; 17321da177e4SLinus Torvalds fill_pre_wcc(ffhp); 17331da177e4SLinus Torvalds fill_pre_wcc(tfhp); 17341da177e4SLinus Torvalds 17351da177e4SLinus Torvalds odentry = lookup_one_len(fname, fdentry, flen); 17366264d69dSAl Viro host_err = PTR_ERR(odentry); 17371da177e4SLinus Torvalds if (IS_ERR(odentry)) 17381da177e4SLinus Torvalds goto out_nfserr; 17391da177e4SLinus Torvalds 17406264d69dSAl Viro host_err = -ENOENT; 17411da177e4SLinus Torvalds if (!odentry->d_inode) 17421da177e4SLinus Torvalds goto out_dput_old; 17436264d69dSAl Viro host_err = -EINVAL; 17441da177e4SLinus Torvalds if (odentry == trap) 17451da177e4SLinus Torvalds goto out_dput_old; 17461da177e4SLinus Torvalds 17471da177e4SLinus Torvalds ndentry = lookup_one_len(tname, tdentry, tlen); 17486264d69dSAl Viro host_err = PTR_ERR(ndentry); 17491da177e4SLinus Torvalds if (IS_ERR(ndentry)) 17501da177e4SLinus Torvalds goto out_dput_old; 17516264d69dSAl Viro host_err = -ENOTEMPTY; 17521da177e4SLinus Torvalds if (ndentry == trap) 17531da177e4SLinus Torvalds goto out_dput_new; 17541da177e4SLinus Torvalds 17559079b1ebSDave Hansen if (svc_msnfs(ffhp) && 17561da177e4SLinus Torvalds ((atomic_read(&odentry->d_count) > 1) 17571da177e4SLinus Torvalds || (atomic_read(&ndentry->d_count) > 1))) { 17586264d69dSAl Viro host_err = -EPERM; 17599079b1ebSDave Hansen goto out_dput_new; 17609079b1ebSDave Hansen } 17619079b1ebSDave Hansen 17629079b1ebSDave Hansen host_err = -EXDEV; 17639079b1ebSDave Hansen if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) 17649079b1ebSDave Hansen goto out_dput_new; 17659079b1ebSDave Hansen host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt); 17669079b1ebSDave Hansen if (host_err) 17679079b1ebSDave Hansen goto out_dput_new; 17689079b1ebSDave Hansen 17696264d69dSAl Viro host_err = vfs_rename(fdir, odentry, tdir, ndentry); 1770f501912aSBen Myers if (!host_err) { 1771f501912aSBen Myers host_err = commit_metadata(tfhp); 17726264d69dSAl Viro if (!host_err) 1773f501912aSBen Myers host_err = commit_metadata(ffhp); 17741da177e4SLinus Torvalds } 17751da177e4SLinus Torvalds 17769079b1ebSDave Hansen mnt_drop_write(ffhp->fh_export->ex_path.mnt); 17779079b1ebSDave Hansen 17781da177e4SLinus Torvalds out_dput_new: 17791da177e4SLinus Torvalds dput(ndentry); 17801da177e4SLinus Torvalds out_dput_old: 17811da177e4SLinus Torvalds dput(odentry); 17821da177e4SLinus Torvalds out_nfserr: 17836264d69dSAl Viro err = nfserrno(host_err); 17841da177e4SLinus Torvalds 17851da177e4SLinus Torvalds /* we cannot reply on fh_unlock on the two filehandles, 17861da177e4SLinus Torvalds * as that would do the wrong thing if the two directories 17871da177e4SLinus Torvalds * were the same, so again we do it by hand 17881da177e4SLinus Torvalds */ 17891da177e4SLinus Torvalds fill_post_wcc(ffhp); 17901da177e4SLinus Torvalds fill_post_wcc(tfhp); 17911da177e4SLinus Torvalds unlock_rename(tdentry, fdentry); 17921da177e4SLinus Torvalds ffhp->fh_locked = tfhp->fh_locked = 0; 17931da177e4SLinus Torvalds 17941da177e4SLinus Torvalds out: 17951da177e4SLinus Torvalds return err; 17961da177e4SLinus Torvalds } 17971da177e4SLinus Torvalds 17981da177e4SLinus Torvalds /* 17991da177e4SLinus Torvalds * Unlink a file or directory 18001da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 18011da177e4SLinus Torvalds */ 18026264d69dSAl Viro __be32 18031da177e4SLinus Torvalds nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, 18041da177e4SLinus Torvalds char *fname, int flen) 18051da177e4SLinus Torvalds { 18061da177e4SLinus Torvalds struct dentry *dentry, *rdentry; 18071da177e4SLinus Torvalds struct inode *dirp; 18086264d69dSAl Viro __be32 err; 18096264d69dSAl Viro int host_err; 18101da177e4SLinus Torvalds 18111da177e4SLinus Torvalds err = nfserr_acces; 18121da177e4SLinus Torvalds if (!flen || isdotent(fname, flen)) 18131da177e4SLinus Torvalds goto out; 18148837abcaSMiklos Szeredi err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); 18151da177e4SLinus Torvalds if (err) 18161da177e4SLinus Torvalds goto out; 18171da177e4SLinus Torvalds 181812fd3520SPeter Zijlstra fh_lock_nested(fhp, I_MUTEX_PARENT); 18191da177e4SLinus Torvalds dentry = fhp->fh_dentry; 18201da177e4SLinus Torvalds dirp = dentry->d_inode; 18211da177e4SLinus Torvalds 18221da177e4SLinus Torvalds rdentry = lookup_one_len(fname, dentry, flen); 18236264d69dSAl Viro host_err = PTR_ERR(rdentry); 18241da177e4SLinus Torvalds if (IS_ERR(rdentry)) 18251da177e4SLinus Torvalds goto out_nfserr; 18261da177e4SLinus Torvalds 18271da177e4SLinus Torvalds if (!rdentry->d_inode) { 18281da177e4SLinus Torvalds dput(rdentry); 18291da177e4SLinus Torvalds err = nfserr_noent; 18301da177e4SLinus Torvalds goto out; 18311da177e4SLinus Torvalds } 18321da177e4SLinus Torvalds 18331da177e4SLinus Torvalds if (!type) 18341da177e4SLinus Torvalds type = rdentry->d_inode->i_mode & S_IFMT; 18351da177e4SLinus Torvalds 18360622753bSDave Hansen host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); 18370622753bSDave Hansen if (host_err) 18380622753bSDave Hansen goto out_nfserr; 18390622753bSDave Hansen 18401da177e4SLinus Torvalds if (type != S_IFDIR) { /* It's UNLINK */ 18411da177e4SLinus Torvalds #ifdef MSNFS 18421da177e4SLinus Torvalds if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && 18431da177e4SLinus Torvalds (atomic_read(&rdentry->d_count) > 1)) { 18446264d69dSAl Viro host_err = -EPERM; 18451da177e4SLinus Torvalds } else 18461da177e4SLinus Torvalds #endif 18476264d69dSAl Viro host_err = vfs_unlink(dirp, rdentry); 18481da177e4SLinus Torvalds } else { /* It's RMDIR */ 18496264d69dSAl Viro host_err = vfs_rmdir(dirp, rdentry); 18501da177e4SLinus Torvalds } 18511da177e4SLinus Torvalds 18521da177e4SLinus Torvalds dput(rdentry); 18531da177e4SLinus Torvalds 1854f501912aSBen Myers if (!host_err) 1855f501912aSBen Myers host_err = commit_metadata(fhp); 18561da177e4SLinus Torvalds 18570622753bSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 18581da177e4SLinus Torvalds out_nfserr: 18596264d69dSAl Viro err = nfserrno(host_err); 1860f193fbabSYAMAMOTO Takashi out: 1861f193fbabSYAMAMOTO Takashi return err; 18621da177e4SLinus Torvalds } 18631da177e4SLinus Torvalds 18641da177e4SLinus Torvalds /* 186514f7dd63SDavid Woodhouse * We do this buffering because we must not call back into the file 186614f7dd63SDavid Woodhouse * system's ->lookup() method from the filldir callback. That may well 186714f7dd63SDavid Woodhouse * deadlock a number of file systems. 186814f7dd63SDavid Woodhouse * 186914f7dd63SDavid Woodhouse * This is based heavily on the implementation of same in XFS. 187014f7dd63SDavid Woodhouse */ 187114f7dd63SDavid Woodhouse struct buffered_dirent { 187214f7dd63SDavid Woodhouse u64 ino; 187314f7dd63SDavid Woodhouse loff_t offset; 187414f7dd63SDavid Woodhouse int namlen; 187514f7dd63SDavid Woodhouse unsigned int d_type; 187614f7dd63SDavid Woodhouse char name[]; 187714f7dd63SDavid Woodhouse }; 187814f7dd63SDavid Woodhouse 187914f7dd63SDavid Woodhouse struct readdir_data { 188014f7dd63SDavid Woodhouse char *dirent; 188114f7dd63SDavid Woodhouse size_t used; 188253c9c5c0SAl Viro int full; 188314f7dd63SDavid Woodhouse }; 188414f7dd63SDavid Woodhouse 188514f7dd63SDavid Woodhouse static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, 188614f7dd63SDavid Woodhouse loff_t offset, u64 ino, unsigned int d_type) 188714f7dd63SDavid Woodhouse { 188814f7dd63SDavid Woodhouse struct readdir_data *buf = __buf; 188914f7dd63SDavid Woodhouse struct buffered_dirent *de = (void *)(buf->dirent + buf->used); 189014f7dd63SDavid Woodhouse unsigned int reclen; 189114f7dd63SDavid Woodhouse 189214f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); 189353c9c5c0SAl Viro if (buf->used + reclen > PAGE_SIZE) { 189453c9c5c0SAl Viro buf->full = 1; 189514f7dd63SDavid Woodhouse return -EINVAL; 189653c9c5c0SAl Viro } 189714f7dd63SDavid Woodhouse 189814f7dd63SDavid Woodhouse de->namlen = namlen; 189914f7dd63SDavid Woodhouse de->offset = offset; 190014f7dd63SDavid Woodhouse de->ino = ino; 190114f7dd63SDavid Woodhouse de->d_type = d_type; 190214f7dd63SDavid Woodhouse memcpy(de->name, name, namlen); 190314f7dd63SDavid Woodhouse buf->used += reclen; 190414f7dd63SDavid Woodhouse 190514f7dd63SDavid Woodhouse return 0; 190614f7dd63SDavid Woodhouse } 190714f7dd63SDavid Woodhouse 19082f9092e1SDavid Woodhouse static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func, 19092628b766SDavid Woodhouse struct readdir_cd *cdp, loff_t *offsetp) 19102628b766SDavid Woodhouse { 191114f7dd63SDavid Woodhouse struct readdir_data buf; 191214f7dd63SDavid Woodhouse struct buffered_dirent *de; 19132628b766SDavid Woodhouse int host_err; 191414f7dd63SDavid Woodhouse int size; 191514f7dd63SDavid Woodhouse loff_t offset; 19162628b766SDavid Woodhouse 191714f7dd63SDavid Woodhouse buf.dirent = (void *)__get_free_page(GFP_KERNEL); 191814f7dd63SDavid Woodhouse if (!buf.dirent) 19192f9092e1SDavid Woodhouse return nfserrno(-ENOMEM); 192014f7dd63SDavid Woodhouse 192114f7dd63SDavid Woodhouse offset = *offsetp; 19222628b766SDavid Woodhouse 192314f7dd63SDavid Woodhouse while (1) { 19242f9092e1SDavid Woodhouse struct inode *dir_inode = file->f_path.dentry->d_inode; 192514f7dd63SDavid Woodhouse unsigned int reclen; 192614f7dd63SDavid Woodhouse 1927b726e923SDoug Nazar cdp->err = nfserr_eof; /* will be cleared on successful read */ 192814f7dd63SDavid Woodhouse buf.used = 0; 192953c9c5c0SAl Viro buf.full = 0; 193014f7dd63SDavid Woodhouse 193114f7dd63SDavid Woodhouse host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf); 193253c9c5c0SAl Viro if (buf.full) 193353c9c5c0SAl Viro host_err = 0; 193453c9c5c0SAl Viro 193553c9c5c0SAl Viro if (host_err < 0) 193614f7dd63SDavid Woodhouse break; 193714f7dd63SDavid Woodhouse 193814f7dd63SDavid Woodhouse size = buf.used; 193914f7dd63SDavid Woodhouse 194014f7dd63SDavid Woodhouse if (!size) 194114f7dd63SDavid Woodhouse break; 194214f7dd63SDavid Woodhouse 19432f9092e1SDavid Woodhouse /* 19442f9092e1SDavid Woodhouse * Various filldir functions may end up calling back into 19452f9092e1SDavid Woodhouse * lookup_one_len() and the file system's ->lookup() method. 19462f9092e1SDavid Woodhouse * These expect i_mutex to be held, as it would within readdir. 19472f9092e1SDavid Woodhouse */ 19482f9092e1SDavid Woodhouse host_err = mutex_lock_killable(&dir_inode->i_mutex); 19492f9092e1SDavid Woodhouse if (host_err) 19502f9092e1SDavid Woodhouse break; 19512f9092e1SDavid Woodhouse 195214f7dd63SDavid Woodhouse de = (struct buffered_dirent *)buf.dirent; 195314f7dd63SDavid Woodhouse while (size > 0) { 195414f7dd63SDavid Woodhouse offset = de->offset; 195514f7dd63SDavid Woodhouse 195614f7dd63SDavid Woodhouse if (func(cdp, de->name, de->namlen, de->offset, 195714f7dd63SDavid Woodhouse de->ino, de->d_type)) 19582f9092e1SDavid Woodhouse break; 195914f7dd63SDavid Woodhouse 196014f7dd63SDavid Woodhouse if (cdp->err != nfs_ok) 19612f9092e1SDavid Woodhouse break; 196214f7dd63SDavid Woodhouse 196314f7dd63SDavid Woodhouse reclen = ALIGN(sizeof(*de) + de->namlen, 196414f7dd63SDavid Woodhouse sizeof(u64)); 196514f7dd63SDavid Woodhouse size -= reclen; 196614f7dd63SDavid Woodhouse de = (struct buffered_dirent *)((char *)de + reclen); 196714f7dd63SDavid Woodhouse } 19682f9092e1SDavid Woodhouse mutex_unlock(&dir_inode->i_mutex); 19692f9092e1SDavid Woodhouse if (size > 0) /* We bailed out early */ 19702f9092e1SDavid Woodhouse break; 19712f9092e1SDavid Woodhouse 1972c002a6c7SDavid Woodhouse offset = vfs_llseek(file, 0, SEEK_CUR); 197314f7dd63SDavid Woodhouse } 197414f7dd63SDavid Woodhouse 197514f7dd63SDavid Woodhouse free_page((unsigned long)(buf.dirent)); 19762628b766SDavid Woodhouse 19772628b766SDavid Woodhouse if (host_err) 19782628b766SDavid Woodhouse return nfserrno(host_err); 197914f7dd63SDavid Woodhouse 198014f7dd63SDavid Woodhouse *offsetp = offset; 19812628b766SDavid Woodhouse return cdp->err; 19822628b766SDavid Woodhouse } 19832628b766SDavid Woodhouse 19841da177e4SLinus Torvalds /* 19851da177e4SLinus Torvalds * Read entries from a directory. 19861da177e4SLinus Torvalds * The NFSv3/4 verifier we ignore for now. 19871da177e4SLinus Torvalds */ 19886264d69dSAl Viro __be32 19891da177e4SLinus Torvalds nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, 1990a0ad13efSNeilBrown struct readdir_cd *cdp, filldir_t func) 19911da177e4SLinus Torvalds { 19926264d69dSAl Viro __be32 err; 19931da177e4SLinus Torvalds struct file *file; 19941da177e4SLinus Torvalds loff_t offset = *offsetp; 19951da177e4SLinus Torvalds 19968837abcaSMiklos Szeredi err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file); 19971da177e4SLinus Torvalds if (err) 19981da177e4SLinus Torvalds goto out; 19991da177e4SLinus Torvalds 20001da177e4SLinus Torvalds offset = vfs_llseek(file, offset, 0); 20011da177e4SLinus Torvalds if (offset < 0) { 20021da177e4SLinus Torvalds err = nfserrno((int)offset); 20031da177e4SLinus Torvalds goto out_close; 20041da177e4SLinus Torvalds } 20051da177e4SLinus Torvalds 200614f7dd63SDavid Woodhouse err = nfsd_buffered_readdir(file, func, cdp, offsetp); 20071da177e4SLinus Torvalds 20081da177e4SLinus Torvalds if (err == nfserr_eof || err == nfserr_toosmall) 20091da177e4SLinus Torvalds err = nfs_ok; /* can still be found in ->err */ 20101da177e4SLinus Torvalds out_close: 20111da177e4SLinus Torvalds nfsd_close(file); 20121da177e4SLinus Torvalds out: 20131da177e4SLinus Torvalds return err; 20141da177e4SLinus Torvalds } 20151da177e4SLinus Torvalds 20161da177e4SLinus Torvalds /* 20171da177e4SLinus Torvalds * Get file system stats 20181da177e4SLinus Torvalds * N.B. After this call fhp needs an fh_put 20191da177e4SLinus Torvalds */ 20206264d69dSAl Viro __be32 202104716e66SJ. Bruce Fields nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) 20221da177e4SLinus Torvalds { 202304716e66SJ. Bruce Fields __be32 err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); 2024726c3342SDavid Howells if (!err && vfs_statfs(fhp->fh_dentry,stat)) 20251da177e4SLinus Torvalds err = nfserr_io; 20261da177e4SLinus Torvalds return err; 20271da177e4SLinus Torvalds } 20281da177e4SLinus Torvalds 2029c7d51402SJ. Bruce Fields static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) 2030e22841c6SJ. Bruce Fields { 2031c7d51402SJ. Bruce Fields return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; 2032e22841c6SJ. Bruce Fields } 2033e22841c6SJ. Bruce Fields 20341da177e4SLinus Torvalds /* 20351da177e4SLinus Torvalds * Check for a user's access permissions to this inode. 20361da177e4SLinus Torvalds */ 20376264d69dSAl Viro __be32 20380ec757dfSJ. Bruce Fields nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, 20390ec757dfSJ. Bruce Fields struct dentry *dentry, int acc) 20401da177e4SLinus Torvalds { 20411da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 204214dba533SMimi Zohar struct path path; 20431da177e4SLinus Torvalds int err; 20441da177e4SLinus Torvalds 20458837abcaSMiklos Szeredi if (acc == NFSD_MAY_NOP) 20461da177e4SLinus Torvalds return 0; 20471da177e4SLinus Torvalds #if 0 20481da177e4SLinus Torvalds dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", 20491da177e4SLinus Torvalds acc, 20508837abcaSMiklos Szeredi (acc & NFSD_MAY_READ)? " read" : "", 20518837abcaSMiklos Szeredi (acc & NFSD_MAY_WRITE)? " write" : "", 20528837abcaSMiklos Szeredi (acc & NFSD_MAY_EXEC)? " exec" : "", 20538837abcaSMiklos Szeredi (acc & NFSD_MAY_SATTR)? " sattr" : "", 20548837abcaSMiklos Szeredi (acc & NFSD_MAY_TRUNC)? " trunc" : "", 20558837abcaSMiklos Szeredi (acc & NFSD_MAY_LOCK)? " lock" : "", 20568837abcaSMiklos Szeredi (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", 20571da177e4SLinus Torvalds inode->i_mode, 20581da177e4SLinus Torvalds IS_IMMUTABLE(inode)? " immut" : "", 20591da177e4SLinus Torvalds IS_APPEND(inode)? " append" : "", 20602c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); 20611da177e4SLinus Torvalds dprintk(" owner %d/%d user %d/%d\n", 20625cc0a840SDavid Howells inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); 20631da177e4SLinus Torvalds #endif 20641da177e4SLinus Torvalds 20651da177e4SLinus Torvalds /* Normally we reject any write/sattr etc access on a read-only file 20661da177e4SLinus Torvalds * system. But if it is IRIX doing check on write-access for a 20671da177e4SLinus Torvalds * device special file, we ignore rofs. 20681da177e4SLinus Torvalds */ 20698837abcaSMiklos Szeredi if (!(acc & NFSD_MAY_LOCAL_ACCESS)) 20708837abcaSMiklos Szeredi if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { 20712c463e95SDave Hansen if (exp_rdonly(rqstp, exp) || 20722c463e95SDave Hansen __mnt_is_readonly(exp->ex_path.mnt)) 20731da177e4SLinus Torvalds return nfserr_rofs; 20748837abcaSMiklos Szeredi if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) 20751da177e4SLinus Torvalds return nfserr_perm; 20761da177e4SLinus Torvalds } 20778837abcaSMiklos Szeredi if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) 20781da177e4SLinus Torvalds return nfserr_perm; 20791da177e4SLinus Torvalds 20808837abcaSMiklos Szeredi if (acc & NFSD_MAY_LOCK) { 20811da177e4SLinus Torvalds /* If we cannot rely on authentication in NLM requests, 20821da177e4SLinus Torvalds * just allow locks, otherwise require read permission, or 20831da177e4SLinus Torvalds * ownership 20841da177e4SLinus Torvalds */ 20851da177e4SLinus Torvalds if (exp->ex_flags & NFSEXP_NOAUTHNLM) 20861da177e4SLinus Torvalds return 0; 20871da177e4SLinus Torvalds else 20888837abcaSMiklos Szeredi acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; 20891da177e4SLinus Torvalds } 20901da177e4SLinus Torvalds /* 20911da177e4SLinus Torvalds * The file owner always gets access permission for accesses that 20921da177e4SLinus Torvalds * would normally be checked at open time. This is to make 20931da177e4SLinus Torvalds * file access work even when the client has done a fchmod(fd, 0). 20941da177e4SLinus Torvalds * 20951da177e4SLinus Torvalds * However, `cp foo bar' should fail nevertheless when bar is 20961da177e4SLinus Torvalds * readonly. A sensible way to do this might be to reject all 20971da177e4SLinus Torvalds * attempts to truncate a read-only file, because a creat() call 20981da177e4SLinus Torvalds * always implies file truncation. 20991da177e4SLinus Torvalds * ... but this isn't really fair. A process may reasonably call 21001da177e4SLinus Torvalds * ftruncate on an open file descriptor on a file with perm 000. 21011da177e4SLinus Torvalds * We must trust the client to do permission checking - using "ACCESS" 21021da177e4SLinus Torvalds * with NFSv3. 21031da177e4SLinus Torvalds */ 21048837abcaSMiklos Szeredi if ((acc & NFSD_MAY_OWNER_OVERRIDE) && 21055cc0a840SDavid Howells inode->i_uid == current_fsuid()) 21061da177e4SLinus Torvalds return 0; 21071da177e4SLinus Torvalds 21088837abcaSMiklos Szeredi /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ 2109f419a2e3SAl Viro err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); 21101da177e4SLinus Torvalds 21111da177e4SLinus Torvalds /* Allow read access to binaries even when mode 111 */ 21121da177e4SLinus Torvalds if (err == -EACCES && S_ISREG(inode->i_mode) && 21138837abcaSMiklos Szeredi acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE)) 2114f419a2e3SAl Viro err = inode_permission(inode, MAY_EXEC); 211514dba533SMimi Zohar if (err) 211614dba533SMimi Zohar goto nfsd_out; 21171da177e4SLinus Torvalds 211814dba533SMimi Zohar /* Do integrity (permission) checking now, but defer incrementing 211914dba533SMimi Zohar * IMA counts to the actual file open. 212014dba533SMimi Zohar */ 212114dba533SMimi Zohar path.mnt = exp->ex_path.mnt; 212214dba533SMimi Zohar path.dentry = dentry; 212314dba533SMimi Zohar nfsd_out: 21241da177e4SLinus Torvalds return err? nfserrno(err) : 0; 21251da177e4SLinus Torvalds } 21261da177e4SLinus Torvalds 21271da177e4SLinus Torvalds void 21281da177e4SLinus Torvalds nfsd_racache_shutdown(void) 21291da177e4SLinus Torvalds { 213054a66e54SJeff Layton struct raparms *raparm, *last_raparm; 213154a66e54SJeff Layton unsigned int i; 213254a66e54SJeff Layton 21331da177e4SLinus Torvalds dprintk("nfsd: freeing readahead buffers.\n"); 213454a66e54SJeff Layton 213554a66e54SJeff Layton for (i = 0; i < RAPARM_HASH_SIZE; i++) { 213654a66e54SJeff Layton raparm = raparm_hash[i].pb_head; 213754a66e54SJeff Layton while(raparm) { 213854a66e54SJeff Layton last_raparm = raparm; 213954a66e54SJeff Layton raparm = raparm->p_next; 214054a66e54SJeff Layton kfree(last_raparm); 214154a66e54SJeff Layton } 214254a66e54SJeff Layton raparm_hash[i].pb_head = NULL; 214354a66e54SJeff Layton } 21441da177e4SLinus Torvalds } 21451da177e4SLinus Torvalds /* 21461da177e4SLinus Torvalds * Initialize readahead param cache 21471da177e4SLinus Torvalds */ 21481da177e4SLinus Torvalds int 21491da177e4SLinus Torvalds nfsd_racache_init(int cache_size) 21501da177e4SLinus Torvalds { 21511da177e4SLinus Torvalds int i; 2152fce1456aSGreg Banks int j = 0; 2153fce1456aSGreg Banks int nperbucket; 215454a66e54SJeff Layton struct raparms **raparm = NULL; 21551da177e4SLinus Torvalds 2156fce1456aSGreg Banks 215754a66e54SJeff Layton if (raparm_hash[0].pb_head) 21581da177e4SLinus Torvalds return 0; 215954a66e54SJeff Layton nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); 216054a66e54SJeff Layton if (nperbucket < 2) 216154a66e54SJeff Layton nperbucket = 2; 216254a66e54SJeff Layton cache_size = nperbucket * RAPARM_HASH_SIZE; 21634b3bb06bSYan Burman 21644b3bb06bSYan Burman dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); 216554a66e54SJeff Layton 2166fce1456aSGreg Banks for (i = 0; i < RAPARM_HASH_SIZE; i++) { 2167fce1456aSGreg Banks spin_lock_init(&raparm_hash[i].pb_lock); 216854a66e54SJeff Layton 216954a66e54SJeff Layton raparm = &raparm_hash[i].pb_head; 217054a66e54SJeff Layton for (j = 0; j < nperbucket; j++) { 217154a66e54SJeff Layton *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); 217254a66e54SJeff Layton if (!*raparm) 217354a66e54SJeff Layton goto out_nomem; 217454a66e54SJeff Layton raparm = &(*raparm)->p_next; 2175fce1456aSGreg Banks } 217654a66e54SJeff Layton *raparm = NULL; 21771da177e4SLinus Torvalds } 21784b3bb06bSYan Burman 21791da177e4SLinus Torvalds nfsdstats.ra_size = cache_size; 21801da177e4SLinus Torvalds return 0; 218154a66e54SJeff Layton 218254a66e54SJeff Layton out_nomem: 218354a66e54SJeff Layton dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); 218454a66e54SJeff Layton nfsd_racache_shutdown(); 218554a66e54SJeff Layton return -ENOMEM; 21861da177e4SLinus Torvalds } 2187a257cdd0SAndreas Gruenbacher 2188a257cdd0SAndreas Gruenbacher #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) 2189a257cdd0SAndreas Gruenbacher struct posix_acl * 2190a257cdd0SAndreas Gruenbacher nfsd_get_posix_acl(struct svc_fh *fhp, int type) 2191a257cdd0SAndreas Gruenbacher { 2192a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2193a257cdd0SAndreas Gruenbacher char *name; 2194a257cdd0SAndreas Gruenbacher void *value = NULL; 2195a257cdd0SAndreas Gruenbacher ssize_t size; 2196a257cdd0SAndreas Gruenbacher struct posix_acl *acl; 2197a257cdd0SAndreas Gruenbacher 21985be196e5SChristoph Hellwig if (!IS_POSIXACL(inode)) 2199a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 22005be196e5SChristoph Hellwig 2201a257cdd0SAndreas Gruenbacher switch (type) { 2202a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2203334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2204a257cdd0SAndreas Gruenbacher break; 2205a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2206334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2207a257cdd0SAndreas Gruenbacher break; 2208a257cdd0SAndreas Gruenbacher default: 2209a257cdd0SAndreas Gruenbacher return ERR_PTR(-EOPNOTSUPP); 2210a257cdd0SAndreas Gruenbacher } 2211a257cdd0SAndreas Gruenbacher 22125be196e5SChristoph Hellwig size = nfsd_getxattr(fhp->fh_dentry, name, &value); 22135be196e5SChristoph Hellwig if (size < 0) 22145be196e5SChristoph Hellwig return ERR_PTR(size); 2215a257cdd0SAndreas Gruenbacher 2216a257cdd0SAndreas Gruenbacher acl = posix_acl_from_xattr(value, size); 2217a257cdd0SAndreas Gruenbacher kfree(value); 2218a257cdd0SAndreas Gruenbacher return acl; 2219a257cdd0SAndreas Gruenbacher } 2220a257cdd0SAndreas Gruenbacher 2221a257cdd0SAndreas Gruenbacher int 2222a257cdd0SAndreas Gruenbacher nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) 2223a257cdd0SAndreas Gruenbacher { 2224a257cdd0SAndreas Gruenbacher struct inode *inode = fhp->fh_dentry->d_inode; 2225a257cdd0SAndreas Gruenbacher char *name; 2226a257cdd0SAndreas Gruenbacher void *value = NULL; 2227a257cdd0SAndreas Gruenbacher size_t size; 2228a257cdd0SAndreas Gruenbacher int error; 2229a257cdd0SAndreas Gruenbacher 2230acfa4380SAl Viro if (!IS_POSIXACL(inode) || 2231a257cdd0SAndreas Gruenbacher !inode->i_op->setxattr || !inode->i_op->removexattr) 2232a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2233a257cdd0SAndreas Gruenbacher switch(type) { 2234a257cdd0SAndreas Gruenbacher case ACL_TYPE_ACCESS: 2235334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_ACCESS; 2236a257cdd0SAndreas Gruenbacher break; 2237a257cdd0SAndreas Gruenbacher case ACL_TYPE_DEFAULT: 2238334a13ecSChristoph Hellwig name = POSIX_ACL_XATTR_DEFAULT; 2239a257cdd0SAndreas Gruenbacher break; 2240a257cdd0SAndreas Gruenbacher default: 2241a257cdd0SAndreas Gruenbacher return -EOPNOTSUPP; 2242a257cdd0SAndreas Gruenbacher } 2243a257cdd0SAndreas Gruenbacher 2244a257cdd0SAndreas Gruenbacher if (acl && acl->a_count) { 2245334a13ecSChristoph Hellwig size = posix_acl_xattr_size(acl->a_count); 2246a257cdd0SAndreas Gruenbacher value = kmalloc(size, GFP_KERNEL); 2247a257cdd0SAndreas Gruenbacher if (!value) 2248a257cdd0SAndreas Gruenbacher return -ENOMEM; 22499ccfc29cSFlorin Malita error = posix_acl_to_xattr(acl, value, size); 22509ccfc29cSFlorin Malita if (error < 0) 2251a257cdd0SAndreas Gruenbacher goto getout; 22529ccfc29cSFlorin Malita size = error; 2253a257cdd0SAndreas Gruenbacher } else 2254a257cdd0SAndreas Gruenbacher size = 0; 2255a257cdd0SAndreas Gruenbacher 225618f335afSDave Hansen error = mnt_want_write(fhp->fh_export->ex_path.mnt); 225718f335afSDave Hansen if (error) 225818f335afSDave Hansen goto getout; 2259a257cdd0SAndreas Gruenbacher if (size) 22605be196e5SChristoph Hellwig error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); 2261a257cdd0SAndreas Gruenbacher else { 2262a257cdd0SAndreas Gruenbacher if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) 2263a257cdd0SAndreas Gruenbacher error = 0; 2264a257cdd0SAndreas Gruenbacher else { 22655be196e5SChristoph Hellwig error = vfs_removexattr(fhp->fh_dentry, name); 2266a257cdd0SAndreas Gruenbacher if (error == -ENODATA) 2267a257cdd0SAndreas Gruenbacher error = 0; 2268a257cdd0SAndreas Gruenbacher } 2269a257cdd0SAndreas Gruenbacher } 227018f335afSDave Hansen mnt_drop_write(fhp->fh_export->ex_path.mnt); 2271a257cdd0SAndreas Gruenbacher 2272a257cdd0SAndreas Gruenbacher getout: 2273a257cdd0SAndreas Gruenbacher kfree(value); 2274a257cdd0SAndreas Gruenbacher return error; 2275a257cdd0SAndreas Gruenbacher } 2276a257cdd0SAndreas Gruenbacher #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ 2277