12bad8471SEric Van Hensbergen /* 22bad8471SEric Van Hensbergen * linux/fs/9p/vfs_inode.c 32bad8471SEric Van Hensbergen * 473c592b9SEric Van Hensbergen * This file contains vfs inode ops for the 9P2000 protocol. 52bad8471SEric Van Hensbergen * 62bad8471SEric Van Hensbergen * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> 72bad8471SEric Van Hensbergen * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 82bad8471SEric Van Hensbergen * 92bad8471SEric Van Hensbergen * This program is free software; you can redistribute it and/or modify 1042e8c509SEric Van Hensbergen * it under the terms of the GNU General Public License version 2 1142e8c509SEric Van Hensbergen * as published by the Free Software Foundation. 122bad8471SEric Van Hensbergen * 132bad8471SEric Van Hensbergen * This program is distributed in the hope that it will be useful, 142bad8471SEric Van Hensbergen * but WITHOUT ANY WARRANTY; without even the implied warranty of 152bad8471SEric Van Hensbergen * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 162bad8471SEric Van Hensbergen * GNU General Public License for more details. 172bad8471SEric Van Hensbergen * 182bad8471SEric Van Hensbergen * You should have received a copy of the GNU General Public License 192bad8471SEric Van Hensbergen * along with this program; if not, write to: 202bad8471SEric Van Hensbergen * Free Software Foundation 212bad8471SEric Van Hensbergen * 51 Franklin Street, Fifth Floor 222bad8471SEric Van Hensbergen * Boston, MA 02111-1301 USA 232bad8471SEric Van Hensbergen * 242bad8471SEric Van Hensbergen */ 252bad8471SEric Van Hensbergen 265d385153SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 275d385153SJoe Perches 282bad8471SEric Van Hensbergen #include <linux/module.h> 292bad8471SEric Van Hensbergen #include <linux/errno.h> 302bad8471SEric Van Hensbergen #include <linux/fs.h> 312bad8471SEric Van Hensbergen #include <linux/file.h> 322bad8471SEric Van Hensbergen #include <linux/pagemap.h> 332bad8471SEric Van Hensbergen #include <linux/stat.h> 342bad8471SEric Van Hensbergen #include <linux/string.h> 352bad8471SEric Van Hensbergen #include <linux/inet.h> 362bad8471SEric Van Hensbergen #include <linux/namei.h> 372bad8471SEric Van Hensbergen #include <linux/idr.h> 38e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 395a0e3ad6STejun Heo #include <linux/slab.h> 40ebf46264SAneesh Kumar K.V #include <linux/xattr.h> 4185ff872dSAneesh Kumar K.V #include <linux/posix_acl.h> 42bd238fb4SLatchesar Ionkov #include <net/9p/9p.h> 43bd238fb4SLatchesar Ionkov #include <net/9p/client.h> 442bad8471SEric Van Hensbergen 452bad8471SEric Van Hensbergen #include "v9fs.h" 462bad8471SEric Van Hensbergen #include "v9fs_vfs.h" 472bad8471SEric Van Hensbergen #include "fid.h" 4860e78d2cSAbhishek Kulkarni #include "cache.h" 49ebf46264SAneesh Kumar K.V #include "xattr.h" 5085ff872dSAneesh Kumar K.V #include "acl.h" 512bad8471SEric Van Hensbergen 52754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations; 539b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotu; 54754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations; 55754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations; 56f5fc6145SAneesh Kumar K.V 572bad8471SEric Van Hensbergen /** 582bad8471SEric Van Hensbergen * unixmode2p9mode - convert unix mode bits to plan 9 592bad8471SEric Van Hensbergen * @v9ses: v9fs session information 602bad8471SEric Van Hensbergen * @mode: mode to convert 612bad8471SEric Van Hensbergen * 622bad8471SEric Van Hensbergen */ 632bad8471SEric Van Hensbergen 643eda0de6SAl Viro static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode) 652bad8471SEric Van Hensbergen { 662bad8471SEric Van Hensbergen int res; 672bad8471SEric Van Hensbergen res = mode & 0777; 682bad8471SEric Van Hensbergen if (S_ISDIR(mode)) 69bd238fb4SLatchesar Ionkov res |= P9_DMDIR; 70dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 712bad8471SEric Van Hensbergen if (v9ses->nodev == 0) { 722bad8471SEric Van Hensbergen if (S_ISSOCK(mode)) 73bd238fb4SLatchesar Ionkov res |= P9_DMSOCKET; 742bad8471SEric Van Hensbergen if (S_ISFIFO(mode)) 75bd238fb4SLatchesar Ionkov res |= P9_DMNAMEDPIPE; 762bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 77bd238fb4SLatchesar Ionkov res |= P9_DMDEVICE; 782bad8471SEric Van Hensbergen if (S_ISCHR(mode)) 79bd238fb4SLatchesar Ionkov res |= P9_DMDEVICE; 802bad8471SEric Van Hensbergen } 812bad8471SEric Van Hensbergen 822bad8471SEric Van Hensbergen if ((mode & S_ISUID) == S_ISUID) 83bd238fb4SLatchesar Ionkov res |= P9_DMSETUID; 842bad8471SEric Van Hensbergen if ((mode & S_ISGID) == S_ISGID) 85bd238fb4SLatchesar Ionkov res |= P9_DMSETGID; 86d199d652SAnthony Liguori if ((mode & S_ISVTX) == S_ISVTX) 87d199d652SAnthony Liguori res |= P9_DMSETVTX; 882bad8471SEric Van Hensbergen } 892bad8471SEric Van Hensbergen return res; 902bad8471SEric Van Hensbergen } 912bad8471SEric Van Hensbergen 922bad8471SEric Van Hensbergen /** 93df345c67SAneesh Kumar K.V * p9mode2perm- convert plan9 mode bits to unix permission bits 94df345c67SAneesh Kumar K.V * @v9ses: v9fs session information 95df345c67SAneesh Kumar K.V * @stat: p9_wstat from which mode need to be derived 96df345c67SAneesh Kumar K.V * 97df345c67SAneesh Kumar K.V */ 98df345c67SAneesh Kumar K.V static int p9mode2perm(struct v9fs_session_info *v9ses, 99df345c67SAneesh Kumar K.V struct p9_wstat *stat) 100df345c67SAneesh Kumar K.V { 101df345c67SAneesh Kumar K.V int res; 102df345c67SAneesh Kumar K.V int mode = stat->mode; 103df345c67SAneesh Kumar K.V 104df345c67SAneesh Kumar K.V res = mode & S_IALLUGO; 105df345c67SAneesh Kumar K.V if (v9fs_proto_dotu(v9ses)) { 106df345c67SAneesh Kumar K.V if ((mode & P9_DMSETUID) == P9_DMSETUID) 107df345c67SAneesh Kumar K.V res |= S_ISUID; 108df345c67SAneesh Kumar K.V 109df345c67SAneesh Kumar K.V if ((mode & P9_DMSETGID) == P9_DMSETGID) 110df345c67SAneesh Kumar K.V res |= S_ISGID; 111df345c67SAneesh Kumar K.V 112df345c67SAneesh Kumar K.V if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 113df345c67SAneesh Kumar K.V res |= S_ISVTX; 114df345c67SAneesh Kumar K.V } 115df345c67SAneesh Kumar K.V return res; 116df345c67SAneesh Kumar K.V } 117df345c67SAneesh Kumar K.V 118df345c67SAneesh Kumar K.V /** 1192bad8471SEric Van Hensbergen * p9mode2unixmode- convert plan9 mode bits to unix mode bits 1202bad8471SEric Van Hensbergen * @v9ses: v9fs session information 12145089142SAneesh Kumar K.V * @stat: p9_wstat from which mode need to be derived 12245089142SAneesh Kumar K.V * @rdev: major number, minor number in case of device files. 1232bad8471SEric Van Hensbergen * 1242bad8471SEric Van Hensbergen */ 1253eda0de6SAl Viro static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses, 12645089142SAneesh Kumar K.V struct p9_wstat *stat, dev_t *rdev) 1272bad8471SEric Van Hensbergen { 1282bad8471SEric Van Hensbergen int res; 1293eda0de6SAl Viro u32 mode = stat->mode; 1302bad8471SEric Van Hensbergen 13145089142SAneesh Kumar K.V *rdev = 0; 132df345c67SAneesh Kumar K.V res = p9mode2perm(v9ses, stat); 1332bad8471SEric Van Hensbergen 134bd238fb4SLatchesar Ionkov if ((mode & P9_DMDIR) == P9_DMDIR) 1352bad8471SEric Van Hensbergen res |= S_IFDIR; 136dd6102fbSSripathi Kodi else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) 1372bad8471SEric Van Hensbergen res |= S_IFLNK; 138dd6102fbSSripathi Kodi else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) 1392bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1402bad8471SEric Van Hensbergen res |= S_IFSOCK; 141dd6102fbSSripathi Kodi else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) 1422bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1432bad8471SEric Van Hensbergen res |= S_IFIFO; 144dd6102fbSSripathi Kodi else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) 14545089142SAneesh Kumar K.V && (v9ses->nodev == 0)) { 14645089142SAneesh Kumar K.V char type = 0, ext[32]; 14745089142SAneesh Kumar K.V int major = -1, minor = -1; 14845089142SAneesh Kumar K.V 14945089142SAneesh Kumar K.V strncpy(ext, stat->extension, sizeof(ext)); 15045089142SAneesh Kumar K.V sscanf(ext, "%c %u %u", &type, &major, &minor); 15145089142SAneesh Kumar K.V switch (type) { 15245089142SAneesh Kumar K.V case 'c': 15345089142SAneesh Kumar K.V res |= S_IFCHR; 15445089142SAneesh Kumar K.V break; 15545089142SAneesh Kumar K.V case 'b': 1562bad8471SEric Van Hensbergen res |= S_IFBLK; 15745089142SAneesh Kumar K.V break; 15845089142SAneesh Kumar K.V default: 1595d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n", 1605d385153SJoe Perches type, stat->extension); 16145089142SAneesh Kumar K.V }; 16245089142SAneesh Kumar K.V *rdev = MKDEV(major, minor); 16345089142SAneesh Kumar K.V } else 1642bad8471SEric Van Hensbergen res |= S_IFREG; 1652bad8471SEric Van Hensbergen 1662bad8471SEric Van Hensbergen return res; 1672bad8471SEric Van Hensbergen } 1682bad8471SEric Van Hensbergen 169ee443996SEric Van Hensbergen /** 170ee443996SEric Van Hensbergen * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 171ee443996SEric Van Hensbergen * @uflags: flags to convert 1722e4bef41SEric Van Hensbergen * @extended: if .u extensions are active 173ee443996SEric Van Hensbergen */ 174ee443996SEric Van Hensbergen 1752e4bef41SEric Van Hensbergen int v9fs_uflags2omode(int uflags, int extended) 1766a3124a3SLatchesar Ionkov { 1776a3124a3SLatchesar Ionkov int ret; 1786a3124a3SLatchesar Ionkov 1796a3124a3SLatchesar Ionkov ret = 0; 1806a3124a3SLatchesar Ionkov switch (uflags&3) { 1816a3124a3SLatchesar Ionkov default: 1826a3124a3SLatchesar Ionkov case O_RDONLY: 183bd238fb4SLatchesar Ionkov ret = P9_OREAD; 1846a3124a3SLatchesar Ionkov break; 1856a3124a3SLatchesar Ionkov 1866a3124a3SLatchesar Ionkov case O_WRONLY: 187bd238fb4SLatchesar Ionkov ret = P9_OWRITE; 1886a3124a3SLatchesar Ionkov break; 1896a3124a3SLatchesar Ionkov 1906a3124a3SLatchesar Ionkov case O_RDWR: 191bd238fb4SLatchesar Ionkov ret = P9_ORDWR; 1926a3124a3SLatchesar Ionkov break; 1936a3124a3SLatchesar Ionkov } 1946a3124a3SLatchesar Ionkov 1956a3124a3SLatchesar Ionkov if (uflags & O_TRUNC) 196bd238fb4SLatchesar Ionkov ret |= P9_OTRUNC; 1976a3124a3SLatchesar Ionkov 1982e4bef41SEric Van Hensbergen if (extended) { 1992e4bef41SEric Van Hensbergen if (uflags & O_EXCL) 2002e4bef41SEric Van Hensbergen ret |= P9_OEXCL; 2012e4bef41SEric Van Hensbergen 2026a3124a3SLatchesar Ionkov if (uflags & O_APPEND) 203bd238fb4SLatchesar Ionkov ret |= P9_OAPPEND; 2042e4bef41SEric Van Hensbergen } 2056a3124a3SLatchesar Ionkov 2066a3124a3SLatchesar Ionkov return ret; 2076a3124a3SLatchesar Ionkov } 2086a3124a3SLatchesar Ionkov 2092bad8471SEric Van Hensbergen /** 210531b1094SLatchesar Ionkov * v9fs_blank_wstat - helper function to setup a 9P stat structure 211531b1094SLatchesar Ionkov * @wstat: structure to initialize 2122bad8471SEric Van Hensbergen * 2132bad8471SEric Van Hensbergen */ 2142bad8471SEric Van Hensbergen 2157a4439c4SM. Mohan Kumar void 216bd238fb4SLatchesar Ionkov v9fs_blank_wstat(struct p9_wstat *wstat) 2172bad8471SEric Van Hensbergen { 218531b1094SLatchesar Ionkov wstat->type = ~0; 219531b1094SLatchesar Ionkov wstat->dev = ~0; 220531b1094SLatchesar Ionkov wstat->qid.type = ~0; 221531b1094SLatchesar Ionkov wstat->qid.version = ~0; 222531b1094SLatchesar Ionkov *((long long *)&wstat->qid.path) = ~0; 223531b1094SLatchesar Ionkov wstat->mode = ~0; 224531b1094SLatchesar Ionkov wstat->atime = ~0; 225531b1094SLatchesar Ionkov wstat->mtime = ~0; 226531b1094SLatchesar Ionkov wstat->length = ~0; 227531b1094SLatchesar Ionkov wstat->name = NULL; 228531b1094SLatchesar Ionkov wstat->uid = NULL; 229531b1094SLatchesar Ionkov wstat->gid = NULL; 230531b1094SLatchesar Ionkov wstat->muid = NULL; 231531b1094SLatchesar Ionkov wstat->n_uid = ~0; 232531b1094SLatchesar Ionkov wstat->n_gid = ~0; 233531b1094SLatchesar Ionkov wstat->n_muid = ~0; 234531b1094SLatchesar Ionkov wstat->extension = NULL; 2352bad8471SEric Van Hensbergen } 2362bad8471SEric Van Hensbergen 23760e78d2cSAbhishek Kulkarni /** 23860e78d2cSAbhishek Kulkarni * v9fs_alloc_inode - helper function to allocate an inode 23960e78d2cSAbhishek Kulkarni * 24060e78d2cSAbhishek Kulkarni */ 24160e78d2cSAbhishek Kulkarni struct inode *v9fs_alloc_inode(struct super_block *sb) 24260e78d2cSAbhishek Kulkarni { 243a78ce05dSAneesh Kumar K.V struct v9fs_inode *v9inode; 244a78ce05dSAneesh Kumar K.V v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache, 24560e78d2cSAbhishek Kulkarni GFP_KERNEL); 246a78ce05dSAneesh Kumar K.V if (!v9inode) 24760e78d2cSAbhishek Kulkarni return NULL; 248a78ce05dSAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 249a78ce05dSAneesh Kumar K.V v9inode->fscache = NULL; 250a78ce05dSAneesh Kumar K.V spin_lock_init(&v9inode->fscache_lock); 251a78ce05dSAneesh Kumar K.V #endif 2526b39f6d2SAneesh Kumar K.V v9inode->writeback_fid = NULL; 253b3cbea03SAneesh Kumar K.V v9inode->cache_validity = 0; 2545a7e0a8cSAneesh Kumar K.V mutex_init(&v9inode->v_mutex); 255a78ce05dSAneesh Kumar K.V return &v9inode->vfs_inode; 25660e78d2cSAbhishek Kulkarni } 25760e78d2cSAbhishek Kulkarni 25860e78d2cSAbhishek Kulkarni /** 25960e78d2cSAbhishek Kulkarni * v9fs_destroy_inode - destroy an inode 26060e78d2cSAbhishek Kulkarni * 26160e78d2cSAbhishek Kulkarni */ 26260e78d2cSAbhishek Kulkarni 263fa0d7e3dSNick Piggin static void v9fs_i_callback(struct rcu_head *head) 264fa0d7e3dSNick Piggin { 265fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 266a78ce05dSAneesh Kumar K.V kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 267fa0d7e3dSNick Piggin } 268fa0d7e3dSNick Piggin 26960e78d2cSAbhishek Kulkarni void v9fs_destroy_inode(struct inode *inode) 27060e78d2cSAbhishek Kulkarni { 271fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, v9fs_i_callback); 27260e78d2cSAbhishek Kulkarni } 27360e78d2cSAbhishek Kulkarni 2745ffc0cb3SAneesh Kumar K.V int v9fs_init_inode(struct v9fs_session_info *v9ses, 2753eda0de6SAl Viro struct inode *inode, umode_t mode, dev_t rdev) 2762bad8471SEric Van Hensbergen { 2775ffc0cb3SAneesh Kumar K.V int err = 0; 2782bb54115SAbhishek Kulkarni 279217f206dSDmitry Monakhov inode_init_owner(inode, NULL, mode); 2802bad8471SEric Van Hensbergen inode->i_blocks = 0; 28145089142SAneesh Kumar K.V inode->i_rdev = rdev; 2822bad8471SEric Van Hensbergen inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 283147b31cfSEric Van Hensbergen inode->i_mapping->a_ops = &v9fs_addr_operations; 2842bad8471SEric Van Hensbergen 2852bad8471SEric Van Hensbergen switch (mode & S_IFMT) { 2862bad8471SEric Van Hensbergen case S_IFIFO: 2872bad8471SEric Van Hensbergen case S_IFBLK: 2882bad8471SEric Van Hensbergen case S_IFCHR: 2892bad8471SEric Van Hensbergen case S_IFSOCK: 2904b43516aSM. Mohan Kumar if (v9fs_proto_dotl(v9ses)) { 2914b43516aSM. Mohan Kumar inode->i_op = &v9fs_file_inode_operations_dotl; 2924b43516aSM. Mohan Kumar } else if (v9fs_proto_dotu(v9ses)) { 2934b43516aSM. Mohan Kumar inode->i_op = &v9fs_file_inode_operations; 2944b43516aSM. Mohan Kumar } else { 2955d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, 296bd238fb4SLatchesar Ionkov "special files without extended mode\n"); 2972bb54115SAbhishek Kulkarni err = -EINVAL; 2982bb54115SAbhishek Kulkarni goto error; 299b501611aSEric Van Hensbergen } 3002bb54115SAbhishek Kulkarni init_special_inode(inode, inode->i_mode, inode->i_rdev); 3015d58bec5SEric Van Hensbergen break; 3022bad8471SEric Van Hensbergen case S_IFREG: 3039b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 3049b6533c9SSripathi Kodi inode->i_op = &v9fs_file_inode_operations_dotl; 30529236f4eSAneesh Kumar K.V if (v9ses->cache) 30629236f4eSAneesh Kumar K.V inode->i_fop = 30729236f4eSAneesh Kumar K.V &v9fs_cached_file_operations_dotl; 30829236f4eSAneesh Kumar K.V else 3099b6533c9SSripathi Kodi inode->i_fop = &v9fs_file_operations_dotl; 3109b6533c9SSripathi Kodi } else { 3112bad8471SEric Van Hensbergen inode->i_op = &v9fs_file_inode_operations; 31229236f4eSAneesh Kumar K.V if (v9ses->cache) 31329236f4eSAneesh Kumar K.V inode->i_fop = &v9fs_cached_file_operations; 31429236f4eSAneesh Kumar K.V else 3152bad8471SEric Van Hensbergen inode->i_fop = &v9fs_file_operations; 3169b6533c9SSripathi Kodi } 3179b6533c9SSripathi Kodi 3182bad8471SEric Van Hensbergen break; 319b501611aSEric Van Hensbergen case S_IFLNK: 3209b6533c9SSripathi Kodi if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 3215d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, 3225d385153SJoe Perches "extended modes used with legacy protocol\n"); 3232bb54115SAbhishek Kulkarni err = -EINVAL; 3242bb54115SAbhishek Kulkarni goto error; 325b501611aSEric Van Hensbergen } 3269b6533c9SSripathi Kodi 3279b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3289b6533c9SSripathi Kodi inode->i_op = &v9fs_symlink_inode_operations_dotl; 3299b6533c9SSripathi Kodi else 330b501611aSEric Van Hensbergen inode->i_op = &v9fs_symlink_inode_operations; 3319b6533c9SSripathi Kodi 332b501611aSEric Van Hensbergen break; 3332bad8471SEric Van Hensbergen case S_IFDIR: 334d8c76e6fSDave Hansen inc_nlink(inode); 3359b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3369b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotl; 3379b6533c9SSripathi Kodi else if (v9fs_proto_dotu(v9ses)) 3389b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotu; 339b501611aSEric Van Hensbergen else 3402bad8471SEric Van Hensbergen inode->i_op = &v9fs_dir_inode_operations; 3419b6533c9SSripathi Kodi 3429b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3439b6533c9SSripathi Kodi inode->i_fop = &v9fs_dir_operations_dotl; 3449b6533c9SSripathi Kodi else 3452bad8471SEric Van Hensbergen inode->i_fop = &v9fs_dir_operations; 3469b6533c9SSripathi Kodi 3472bad8471SEric Van Hensbergen break; 3482bad8471SEric Van Hensbergen default: 349609eac1cSLinus Torvalds p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 3502bad8471SEric Van Hensbergen mode, mode & S_IFMT); 3512bb54115SAbhishek Kulkarni err = -EINVAL; 3522bb54115SAbhishek Kulkarni goto error; 3532bad8471SEric Van Hensbergen } 3542bb54115SAbhishek Kulkarni error: 3555ffc0cb3SAneesh Kumar K.V return err; 3565ffc0cb3SAneesh Kumar K.V 3575ffc0cb3SAneesh Kumar K.V } 3585ffc0cb3SAneesh Kumar K.V 3595ffc0cb3SAneesh Kumar K.V /** 3605ffc0cb3SAneesh Kumar K.V * v9fs_get_inode - helper function to setup an inode 3615ffc0cb3SAneesh Kumar K.V * @sb: superblock 3625ffc0cb3SAneesh Kumar K.V * @mode: mode to setup inode with 3635ffc0cb3SAneesh Kumar K.V * 3645ffc0cb3SAneesh Kumar K.V */ 3655ffc0cb3SAneesh Kumar K.V 3663eda0de6SAl Viro struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) 3675ffc0cb3SAneesh Kumar K.V { 3685ffc0cb3SAneesh Kumar K.V int err; 3695ffc0cb3SAneesh Kumar K.V struct inode *inode; 3705ffc0cb3SAneesh Kumar K.V struct v9fs_session_info *v9ses = sb->s_fs_info; 3715ffc0cb3SAneesh Kumar K.V 372609eac1cSLinus Torvalds p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); 3735ffc0cb3SAneesh Kumar K.V 3745ffc0cb3SAneesh Kumar K.V inode = new_inode(sb); 3755ffc0cb3SAneesh Kumar K.V if (!inode) { 3765d385153SJoe Perches pr_warn("%s (%d): Problem allocating inode\n", 3775d385153SJoe Perches __func__, task_pid_nr(current)); 3785ffc0cb3SAneesh Kumar K.V return ERR_PTR(-ENOMEM); 3795ffc0cb3SAneesh Kumar K.V } 38045089142SAneesh Kumar K.V err = v9fs_init_inode(v9ses, inode, mode, rdev); 3815ffc0cb3SAneesh Kumar K.V if (err) { 3822bb54115SAbhishek Kulkarni iput(inode); 3832bb54115SAbhishek Kulkarni return ERR_PTR(err); 3842bad8471SEric Van Hensbergen } 3855ffc0cb3SAneesh Kumar K.V return inode; 3865ffc0cb3SAneesh Kumar K.V } 3872bad8471SEric Van Hensbergen 388bd238fb4SLatchesar Ionkov /* 3896a3124a3SLatchesar Ionkov static struct v9fs_fid* 3906a3124a3SLatchesar Ionkov v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 3916a3124a3SLatchesar Ionkov { 3926a3124a3SLatchesar Ionkov int err; 393736c4b85SMika Kukkonen int nfid; 3946a3124a3SLatchesar Ionkov struct v9fs_fid *ret; 3956a3124a3SLatchesar Ionkov struct v9fs_fcall *fcall; 3960b8dd177SLatchesar Ionkov 3976a3124a3SLatchesar Ionkov nfid = v9fs_get_idpool(&v9ses->fidpool); 3986a3124a3SLatchesar Ionkov if (nfid < 0) { 3990b8dd177SLatchesar Ionkov eprintk(KERN_WARNING, "no free fids available\n"); 400731805b4SLatchesar Ionkov return ERR_PTR(-ENOSPC); 4010b8dd177SLatchesar Ionkov } 4020b8dd177SLatchesar Ionkov 4036a3124a3SLatchesar Ionkov err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 4046a3124a3SLatchesar Ionkov &fcall); 4056a3124a3SLatchesar Ionkov 4066a3124a3SLatchesar Ionkov if (err < 0) { 40741e5a6acSLatchesar Ionkov if (fcall && fcall->id == RWALK) 40841e5a6acSLatchesar Ionkov goto clunk_fid; 40941e5a6acSLatchesar Ionkov 4106a3124a3SLatchesar Ionkov PRINT_FCALL_ERROR("walk error", fcall); 4116a3124a3SLatchesar Ionkov v9fs_put_idpool(nfid, &v9ses->fidpool); 4126a3124a3SLatchesar Ionkov goto error; 4130b8dd177SLatchesar Ionkov } 4146a3124a3SLatchesar Ionkov 4153cf6429aSLatchesar Ionkov kfree(fcall); 4163cf6429aSLatchesar Ionkov fcall = NULL; 4176a3124a3SLatchesar Ionkov ret = v9fs_fid_create(v9ses, nfid); 4186a3124a3SLatchesar Ionkov if (!ret) { 4196a3124a3SLatchesar Ionkov err = -ENOMEM; 4206a3124a3SLatchesar Ionkov goto clunk_fid; 4210b8dd177SLatchesar Ionkov } 4222bad8471SEric Van Hensbergen 4236a3124a3SLatchesar Ionkov err = v9fs_fid_insert(ret, dentry); 4246a3124a3SLatchesar Ionkov if (err < 0) { 4256a3124a3SLatchesar Ionkov v9fs_fid_destroy(ret); 4266a3124a3SLatchesar Ionkov goto clunk_fid; 4276a3124a3SLatchesar Ionkov } 4282bad8471SEric Van Hensbergen 4296a3124a3SLatchesar Ionkov return ret; 4306a3124a3SLatchesar Ionkov 4316a3124a3SLatchesar Ionkov clunk_fid: 4326a3124a3SLatchesar Ionkov v9fs_t_clunk(v9ses, nfid); 4336a3124a3SLatchesar Ionkov 4346a3124a3SLatchesar Ionkov error: 4356a3124a3SLatchesar Ionkov kfree(fcall); 4366a3124a3SLatchesar Ionkov return ERR_PTR(err); 4376a3124a3SLatchesar Ionkov } 438bd238fb4SLatchesar Ionkov */ 4396a3124a3SLatchesar Ionkov 44060e78d2cSAbhishek Kulkarni 44160e78d2cSAbhishek Kulkarni /** 44260e78d2cSAbhishek Kulkarni * v9fs_clear_inode - release an inode 44360e78d2cSAbhishek Kulkarni * @inode: inode to release 44460e78d2cSAbhishek Kulkarni * 44560e78d2cSAbhishek Kulkarni */ 446b57922d9SAl Viro void v9fs_evict_inode(struct inode *inode) 44760e78d2cSAbhishek Kulkarni { 4486b39f6d2SAneesh Kumar K.V struct v9fs_inode *v9inode = V9FS_I(inode); 4496b39f6d2SAneesh Kumar K.V 450b57922d9SAl Viro truncate_inode_pages(inode->i_mapping, 0); 451dbd5768fSJan Kara clear_inode(inode); 45260e78d2cSAbhishek Kulkarni filemap_fdatawrite(inode->i_mapping); 45360e78d2cSAbhishek Kulkarni 45460e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 45560e78d2cSAbhishek Kulkarni v9fs_cache_inode_put_cookie(inode); 45660e78d2cSAbhishek Kulkarni #endif 4576b39f6d2SAneesh Kumar K.V /* clunk the fid stashed in writeback_fid */ 4586b39f6d2SAneesh Kumar K.V if (v9inode->writeback_fid) { 4596b39f6d2SAneesh Kumar K.V p9_client_clunk(v9inode->writeback_fid); 4606b39f6d2SAneesh Kumar K.V v9inode->writeback_fid = NULL; 4613cf387d7SAneesh Kumar K.V } 46260e78d2cSAbhishek Kulkarni } 46360e78d2cSAbhishek Kulkarni 464fd2421f5SAneesh Kumar K.V static int v9fs_test_inode(struct inode *inode, void *data) 465fd2421f5SAneesh Kumar K.V { 466fd2421f5SAneesh Kumar K.V int umode; 46745089142SAneesh Kumar K.V dev_t rdev; 468fd2421f5SAneesh Kumar K.V struct v9fs_inode *v9inode = V9FS_I(inode); 469fd2421f5SAneesh Kumar K.V struct p9_wstat *st = (struct p9_wstat *)data; 470fd2421f5SAneesh Kumar K.V struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 471fd2421f5SAneesh Kumar K.V 47245089142SAneesh Kumar K.V umode = p9mode2unixmode(v9ses, st, &rdev); 473fd2421f5SAneesh Kumar K.V /* don't match inode of different type */ 474fd2421f5SAneesh Kumar K.V if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 475fd2421f5SAneesh Kumar K.V return 0; 476fd2421f5SAneesh Kumar K.V 477fd2421f5SAneesh Kumar K.V /* compare qid details */ 478fd2421f5SAneesh Kumar K.V if (memcmp(&v9inode->qid.version, 479fd2421f5SAneesh Kumar K.V &st->qid.version, sizeof(v9inode->qid.version))) 480fd2421f5SAneesh Kumar K.V return 0; 481fd2421f5SAneesh Kumar K.V 482fd2421f5SAneesh Kumar K.V if (v9inode->qid.type != st->qid.type) 483fd2421f5SAneesh Kumar K.V return 0; 484fd2421f5SAneesh Kumar K.V return 1; 485fd2421f5SAneesh Kumar K.V } 486fd2421f5SAneesh Kumar K.V 487ed80fcfaSAneesh Kumar K.V static int v9fs_test_new_inode(struct inode *inode, void *data) 488ed80fcfaSAneesh Kumar K.V { 489ed80fcfaSAneesh Kumar K.V return 0; 490ed80fcfaSAneesh Kumar K.V } 491ed80fcfaSAneesh Kumar K.V 492fd2421f5SAneesh Kumar K.V static int v9fs_set_inode(struct inode *inode, void *data) 493fd2421f5SAneesh Kumar K.V { 494fd2421f5SAneesh Kumar K.V struct v9fs_inode *v9inode = V9FS_I(inode); 495fd2421f5SAneesh Kumar K.V struct p9_wstat *st = (struct p9_wstat *)data; 496fd2421f5SAneesh Kumar K.V 497fd2421f5SAneesh Kumar K.V memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 498fd2421f5SAneesh Kumar K.V return 0; 499fd2421f5SAneesh Kumar K.V } 500fd2421f5SAneesh Kumar K.V 5015ffc0cb3SAneesh Kumar K.V static struct inode *v9fs_qid_iget(struct super_block *sb, 5025ffc0cb3SAneesh Kumar K.V struct p9_qid *qid, 503ed80fcfaSAneesh Kumar K.V struct p9_wstat *st, 504ed80fcfaSAneesh Kumar K.V int new) 5055ffc0cb3SAneesh Kumar K.V { 50645089142SAneesh Kumar K.V dev_t rdev; 5073eda0de6SAl Viro int retval; 5083eda0de6SAl Viro umode_t umode; 5095ffc0cb3SAneesh Kumar K.V unsigned long i_ino; 5105ffc0cb3SAneesh Kumar K.V struct inode *inode; 5115ffc0cb3SAneesh Kumar K.V struct v9fs_session_info *v9ses = sb->s_fs_info; 512ed80fcfaSAneesh Kumar K.V int (*test)(struct inode *, void *); 513ed80fcfaSAneesh Kumar K.V 514ed80fcfaSAneesh Kumar K.V if (new) 515ed80fcfaSAneesh Kumar K.V test = v9fs_test_new_inode; 516ed80fcfaSAneesh Kumar K.V else 517ed80fcfaSAneesh Kumar K.V test = v9fs_test_inode; 5185ffc0cb3SAneesh Kumar K.V 5195ffc0cb3SAneesh Kumar K.V i_ino = v9fs_qid2ino(qid); 520ed80fcfaSAneesh Kumar K.V inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 5215ffc0cb3SAneesh Kumar K.V if (!inode) 5225ffc0cb3SAneesh Kumar K.V return ERR_PTR(-ENOMEM); 5235ffc0cb3SAneesh Kumar K.V if (!(inode->i_state & I_NEW)) 5245ffc0cb3SAneesh Kumar K.V return inode; 5255ffc0cb3SAneesh Kumar K.V /* 5265ffc0cb3SAneesh Kumar K.V * initialize the inode with the stat info 5275ffc0cb3SAneesh Kumar K.V * FIXME!! we may need support for stale inodes 5285ffc0cb3SAneesh Kumar K.V * later. 5295ffc0cb3SAneesh Kumar K.V */ 530fd2421f5SAneesh Kumar K.V inode->i_ino = i_ino; 53145089142SAneesh Kumar K.V umode = p9mode2unixmode(v9ses, st, &rdev); 53245089142SAneesh Kumar K.V retval = v9fs_init_inode(v9ses, inode, umode, rdev); 5335ffc0cb3SAneesh Kumar K.V if (retval) 5345ffc0cb3SAneesh Kumar K.V goto error; 5355ffc0cb3SAneesh Kumar K.V 5365ffc0cb3SAneesh Kumar K.V v9fs_stat2inode(st, inode, sb); 5375ffc0cb3SAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 5385ffc0cb3SAneesh Kumar K.V v9fs_cache_inode_get_cookie(inode); 5395ffc0cb3SAneesh Kumar K.V #endif 5405ffc0cb3SAneesh Kumar K.V unlock_new_inode(inode); 5415ffc0cb3SAneesh Kumar K.V return inode; 5425ffc0cb3SAneesh Kumar K.V error: 5435ffc0cb3SAneesh Kumar K.V unlock_new_inode(inode); 5445ffc0cb3SAneesh Kumar K.V iput(inode); 5455ffc0cb3SAneesh Kumar K.V return ERR_PTR(retval); 5465ffc0cb3SAneesh Kumar K.V 5475ffc0cb3SAneesh Kumar K.V } 5485ffc0cb3SAneesh Kumar K.V 54953c06f4eSAneesh Kumar K.V struct inode * 550a78ce05dSAneesh Kumar K.V v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 551ed80fcfaSAneesh Kumar K.V struct super_block *sb, int new) 5526a3124a3SLatchesar Ionkov { 55351a87c55SEric Van Hensbergen struct p9_wstat *st; 5545ffc0cb3SAneesh Kumar K.V struct inode *inode = NULL; 5556a3124a3SLatchesar Ionkov 556bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 55702bc3567SAbhishek Kulkarni if (IS_ERR(st)) 55802bc3567SAbhishek Kulkarni return ERR_CAST(st); 5592bad8471SEric Van Hensbergen 560ed80fcfaSAneesh Kumar K.V inode = v9fs_qid_iget(sb, &st->qid, st, new); 56102bc3567SAbhishek Kulkarni p9stat_free(st); 562bd238fb4SLatchesar Ionkov kfree(st); 5635ffc0cb3SAneesh Kumar K.V return inode; 5642bad8471SEric Van Hensbergen } 5652bad8471SEric Van Hensbergen 5662bad8471SEric Van Hensbergen /** 567f88657ceSAneesh Kumar K.V * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 568f88657ceSAneesh Kumar K.V * plan 9 AT flag. 569f88657ceSAneesh Kumar K.V * @flags: flags to convert 570f88657ceSAneesh Kumar K.V */ 571f88657ceSAneesh Kumar K.V static int v9fs_at_to_dotl_flags(int flags) 572f88657ceSAneesh Kumar K.V { 573f88657ceSAneesh Kumar K.V int rflags = 0; 574f88657ceSAneesh Kumar K.V if (flags & AT_REMOVEDIR) 575f88657ceSAneesh Kumar K.V rflags |= P9_DOTL_AT_REMOVEDIR; 576f88657ceSAneesh Kumar K.V return rflags; 577f88657ceSAneesh Kumar K.V } 578f88657ceSAneesh Kumar K.V 579f88657ceSAneesh Kumar K.V /** 5802bad8471SEric Van Hensbergen * v9fs_remove - helper function to remove files and directories 58173c592b9SEric Van Hensbergen * @dir: directory inode that is being deleted 58248e370ffSAneesh Kumar K.V * @dentry: dentry that is being deleted 58373c592b9SEric Van Hensbergen * @rmdir: removing a directory 5842bad8471SEric Van Hensbergen * 5852bad8471SEric Van Hensbergen */ 5862bad8471SEric Van Hensbergen 58748e370ffSAneesh Kumar K.V static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 5882bad8471SEric Van Hensbergen { 58948e370ffSAneesh Kumar K.V struct inode *inode; 59048e370ffSAneesh Kumar K.V int retval = -EOPNOTSUPP; 59148e370ffSAneesh Kumar K.V struct p9_fid *v9fid, *dfid; 59248e370ffSAneesh Kumar K.V struct v9fs_session_info *v9ses; 5932bad8471SEric Van Hensbergen 5945d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 59548e370ffSAneesh Kumar K.V dir, dentry, flags); 5962bad8471SEric Van Hensbergen 59748e370ffSAneesh Kumar K.V v9ses = v9fs_inode2v9ses(dir); 59848e370ffSAneesh Kumar K.V inode = dentry->d_inode; 59948e370ffSAneesh Kumar K.V dfid = v9fs_fid_lookup(dentry->d_parent); 60048e370ffSAneesh Kumar K.V if (IS_ERR(dfid)) { 60148e370ffSAneesh Kumar K.V retval = PTR_ERR(dfid); 6025d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 60348e370ffSAneesh Kumar K.V return retval; 60448e370ffSAneesh Kumar K.V } 60548e370ffSAneesh Kumar K.V if (v9fs_proto_dotl(v9ses)) 606f88657ceSAneesh Kumar K.V retval = p9_client_unlinkat(dfid, dentry->d_name.name, 607f88657ceSAneesh Kumar K.V v9fs_at_to_dotl_flags(flags)); 60848e370ffSAneesh Kumar K.V if (retval == -EOPNOTSUPP) { 60948e370ffSAneesh Kumar K.V /* Try the one based on path */ 61048e370ffSAneesh Kumar K.V v9fid = v9fs_fid_clone(dentry); 611da977b2cSEric Van Hensbergen if (IS_ERR(v9fid)) 612da977b2cSEric Van Hensbergen return PTR_ERR(v9fid); 613d994f405SAneesh Kumar K.V retval = p9_client_remove(v9fid); 61448e370ffSAneesh Kumar K.V } 615b271ec47SAneesh Kumar K.V if (!retval) { 616b271ec47SAneesh Kumar K.V /* 617b271ec47SAneesh Kumar K.V * directories on unlink should have zero 618b271ec47SAneesh Kumar K.V * link count 619b271ec47SAneesh Kumar K.V */ 62048e370ffSAneesh Kumar K.V if (flags & AT_REMOVEDIR) { 62148e370ffSAneesh Kumar K.V clear_nlink(inode); 622b271ec47SAneesh Kumar K.V drop_nlink(dir); 623b271ec47SAneesh Kumar K.V } else 62448e370ffSAneesh Kumar K.V drop_nlink(inode); 625d28c61f0SAneesh Kumar K.V 62648e370ffSAneesh Kumar K.V v9fs_invalidate_inode_attr(inode); 627d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(dir); 628b271ec47SAneesh Kumar K.V } 629d994f405SAneesh Kumar K.V return retval; 6302bad8471SEric Van Hensbergen } 6312bad8471SEric Van Hensbergen 632bd238fb4SLatchesar Ionkov /** 633bd238fb4SLatchesar Ionkov * v9fs_create - Create a file 634ee443996SEric Van Hensbergen * @v9ses: session information 635ee443996SEric Van Hensbergen * @dir: directory that dentry is being created in 636bd238fb4SLatchesar Ionkov * @dentry: dentry that is being created 6370e15597eSAbhishek Kulkarni * @extension: 9p2000.u extension string to support devices, etc. 638bd238fb4SLatchesar Ionkov * @perm: create permissions 639bd238fb4SLatchesar Ionkov * @mode: open mode 640bd238fb4SLatchesar Ionkov * 641bd238fb4SLatchesar Ionkov */ 642bd238fb4SLatchesar Ionkov static struct p9_fid * 643bd238fb4SLatchesar Ionkov v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 644bd238fb4SLatchesar Ionkov struct dentry *dentry, char *extension, u32 perm, u8 mode) 645bd238fb4SLatchesar Ionkov { 646bd238fb4SLatchesar Ionkov int err; 647bd238fb4SLatchesar Ionkov char *name; 648bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *ofid, *fid; 649bd238fb4SLatchesar Ionkov struct inode *inode; 650bd238fb4SLatchesar Ionkov 6515d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 65251a87c55SEric Van Hensbergen 653bd238fb4SLatchesar Ionkov err = 0; 654bd238fb4SLatchesar Ionkov ofid = NULL; 655bd238fb4SLatchesar Ionkov fid = NULL; 656bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 6576d27e64dSVenkateswararao Jujjuri dfid = v9fs_fid_lookup(dentry->d_parent); 658bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) { 659bd238fb4SLatchesar Ionkov err = PTR_ERR(dfid); 6605d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 6616d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 662bd238fb4SLatchesar Ionkov } 663bd238fb4SLatchesar Ionkov 664bd238fb4SLatchesar Ionkov /* clone a fid to use for creation */ 665bd238fb4SLatchesar Ionkov ofid = p9_client_walk(dfid, 0, NULL, 1); 666bd238fb4SLatchesar Ionkov if (IS_ERR(ofid)) { 667bd238fb4SLatchesar Ionkov err = PTR_ERR(ofid); 6685d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 6696d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 670bd238fb4SLatchesar Ionkov } 671bd238fb4SLatchesar Ionkov 672bd238fb4SLatchesar Ionkov err = p9_client_fcreate(ofid, name, perm, mode, extension); 67351a87c55SEric Van Hensbergen if (err < 0) { 6745d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 675bd238fb4SLatchesar Ionkov goto error; 67651a87c55SEric Van Hensbergen } 677bd238fb4SLatchesar Ionkov 678b6054793SAneesh Kumar K.V if (!(perm & P9_DMLINK)) { 679bd238fb4SLatchesar Ionkov /* now walk from the parent so we can get unopened fid */ 6806d27e64dSVenkateswararao Jujjuri fid = p9_client_walk(dfid, 1, &name, 1); 681bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 682bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 683b6054793SAneesh Kumar K.V p9_debug(P9_DEBUG_VFS, 684b6054793SAneesh Kumar K.V "p9_client_walk failed %d\n", err); 685bd238fb4SLatchesar Ionkov fid = NULL; 686bd238fb4SLatchesar Ionkov goto error; 6876d27e64dSVenkateswararao Jujjuri } 688b6054793SAneesh Kumar K.V /* 689b6054793SAneesh Kumar K.V * instantiate inode and assign the unopened fid to the dentry 690b6054793SAneesh Kumar K.V */ 691ed80fcfaSAneesh Kumar K.V inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 692bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 693bd238fb4SLatchesar Ionkov err = PTR_ERR(inode); 694b6054793SAneesh Kumar K.V p9_debug(P9_DEBUG_VFS, 695b6054793SAneesh Kumar K.V "inode creation failed %d\n", err); 696bd238fb4SLatchesar Ionkov goto error; 697bd238fb4SLatchesar Ionkov } 69850fb6d2bSAbhishek Kulkarni err = v9fs_fid_add(dentry, fid); 69950fb6d2bSAbhishek Kulkarni if (err < 0) 70050fb6d2bSAbhishek Kulkarni goto error; 7015441ae5eSAneesh Kumar K.V d_instantiate(dentry, inode); 702b6054793SAneesh Kumar K.V } 703bd238fb4SLatchesar Ionkov return ofid; 704bd238fb4SLatchesar Ionkov error: 705bd238fb4SLatchesar Ionkov if (ofid) 706bd238fb4SLatchesar Ionkov p9_client_clunk(ofid); 707bd238fb4SLatchesar Ionkov 708bd238fb4SLatchesar Ionkov if (fid) 709bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 710bd238fb4SLatchesar Ionkov 711bd238fb4SLatchesar Ionkov return ERR_PTR(err); 712bd238fb4SLatchesar Ionkov } 713bd238fb4SLatchesar Ionkov 7142bad8471SEric Van Hensbergen /** 715e43ae79cSMiklos Szeredi * v9fs_vfs_create - VFS hook to create a regular file 716e43ae79cSMiklos Szeredi * 717e43ae79cSMiklos Szeredi * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 718e43ae79cSMiklos Szeredi * for mknod(2). 719e43ae79cSMiklos Szeredi * 720ee443996SEric Van Hensbergen * @dir: directory inode that is being created 7212bad8471SEric Van Hensbergen * @dentry: dentry that is being deleted 7226a3124a3SLatchesar Ionkov * @mode: create permissions 7232bad8471SEric Van Hensbergen * 7242bad8471SEric Van Hensbergen */ 7252bad8471SEric Van Hensbergen 7262bad8471SEric Van Hensbergen static int 7274acdaf27SAl Viro v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 7282bad8471SEric Van Hensbergen struct nameidata *nd) 7292bad8471SEric Van Hensbergen { 730e43ae79cSMiklos Szeredi struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 731e43ae79cSMiklos Szeredi u32 perm = unixmode2p9mode(v9ses, mode); 732e43ae79cSMiklos Szeredi struct p9_fid *fid; 7336a3124a3SLatchesar Ionkov 734e43ae79cSMiklos Szeredi /* P9_OEXCL? */ 735e43ae79cSMiklos Szeredi fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 736e43ae79cSMiklos Szeredi if (IS_ERR(fid)) 737e43ae79cSMiklos Szeredi return PTR_ERR(fid); 7386a3124a3SLatchesar Ionkov 739d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(dir); 740bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 7416a3124a3SLatchesar Ionkov 7426a3124a3SLatchesar Ionkov return 0; 7432bad8471SEric Van Hensbergen } 7442bad8471SEric Van Hensbergen 7452bad8471SEric Van Hensbergen /** 7462bad8471SEric Van Hensbergen * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 747ee443996SEric Van Hensbergen * @dir: inode that is being unlinked 7482bad8471SEric Van Hensbergen * @dentry: dentry that is being unlinked 7492bad8471SEric Van Hensbergen * @mode: mode for new directory 7502bad8471SEric Van Hensbergen * 7512bad8471SEric Van Hensbergen */ 7522bad8471SEric Van Hensbergen 75318bb1db3SAl Viro static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 7542bad8471SEric Van Hensbergen { 7556a3124a3SLatchesar Ionkov int err; 756bd238fb4SLatchesar Ionkov u32 perm; 757bd238fb4SLatchesar Ionkov struct p9_fid *fid; 758d28c61f0SAneesh Kumar K.V struct v9fs_session_info *v9ses; 7596a3124a3SLatchesar Ionkov 7605d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 761bd238fb4SLatchesar Ionkov err = 0; 7626a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 7636a3124a3SLatchesar Ionkov perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 764bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 765bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 766bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 767bd238fb4SLatchesar Ionkov fid = NULL; 768d28c61f0SAneesh Kumar K.V } else { 769b271ec47SAneesh Kumar K.V inc_nlink(dir); 770d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(dir); 771d28c61f0SAneesh Kumar K.V } 7726a3124a3SLatchesar Ionkov 773bd238fb4SLatchesar Ionkov if (fid) 774bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 7756a3124a3SLatchesar Ionkov 7766a3124a3SLatchesar Ionkov return err; 7772bad8471SEric Van Hensbergen } 7782bad8471SEric Van Hensbergen 7792bad8471SEric Van Hensbergen /** 7802bad8471SEric Van Hensbergen * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 7812bad8471SEric Van Hensbergen * @dir: inode that is being walked from 7822bad8471SEric Van Hensbergen * @dentry: dentry that is being walked to? 7832bad8471SEric Van Hensbergen * @nameidata: path data 7842bad8471SEric Van Hensbergen * 7852bad8471SEric Van Hensbergen */ 7862bad8471SEric Van Hensbergen 78753c06f4eSAneesh Kumar K.V struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 78800cd8dd3SAl Viro unsigned int flags) 7892bad8471SEric Van Hensbergen { 79073f50717SAneesh Kumar K.V struct dentry *res; 7912bad8471SEric Van Hensbergen struct super_block *sb; 7922bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses; 793bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *fid; 7942bad8471SEric Van Hensbergen struct inode *inode; 795bd238fb4SLatchesar Ionkov char *name; 7962bad8471SEric Van Hensbergen int result = 0; 7972bad8471SEric Van Hensbergen 79800cd8dd3SAl Viro p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p flags: %x\n", 79900cd8dd3SAl Viro dir, dentry->d_name.name, dentry, flags); 8002bad8471SEric Van Hensbergen 80111e9b49bSSripathi Kodi if (dentry->d_name.len > NAME_MAX) 80211e9b49bSSripathi Kodi return ERR_PTR(-ENAMETOOLONG); 80311e9b49bSSripathi Kodi 8042bad8471SEric Van Hensbergen sb = dir->i_sb; 8052bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(dir); 806a534c8d1SAneesh Kumar K.V /* We can walk d_parent because we hold the dir->i_mutex */ 807bd238fb4SLatchesar Ionkov dfid = v9fs_fid_lookup(dentry->d_parent); 808bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) 809e231c2eeSDavid Howells return ERR_CAST(dfid); 8102bad8471SEric Van Hensbergen 811bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 812bd238fb4SLatchesar Ionkov fid = p9_client_walk(dfid, 1, &name, 1); 813bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 814bd238fb4SLatchesar Ionkov result = PTR_ERR(fid); 8152bad8471SEric Van Hensbergen if (result == -ENOENT) { 81685e0df24SAneesh Kumar K.V inode = NULL; 81785e0df24SAneesh Kumar K.V goto inst_out; 8182bad8471SEric Van Hensbergen } 8192bad8471SEric Van Hensbergen 820bd238fb4SLatchesar Ionkov return ERR_PTR(result); 8212bad8471SEric Van Hensbergen } 82273f50717SAneesh Kumar K.V /* 82373f50717SAneesh Kumar K.V * Make sure we don't use a wrong inode due to parallel 82473f50717SAneesh Kumar K.V * unlink. For cached mode create calls request for new 82573f50717SAneesh Kumar K.V * inode. But with cache disabled, lookup should do this. 82673f50717SAneesh Kumar K.V */ 82773f50717SAneesh Kumar K.V if (v9ses->cache) 828a78ce05dSAneesh Kumar K.V inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 82973f50717SAneesh Kumar K.V else 83073f50717SAneesh Kumar K.V inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 831bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 832bd238fb4SLatchesar Ionkov result = PTR_ERR(inode); 833bd238fb4SLatchesar Ionkov inode = NULL; 834bd238fb4SLatchesar Ionkov goto error; 8352bad8471SEric Van Hensbergen } 836bd238fb4SLatchesar Ionkov result = v9fs_fid_add(dentry, fid); 8376a3124a3SLatchesar Ionkov if (result < 0) 8389856af8bSAneesh Kumar K.V goto error_iput; 83985e0df24SAneesh Kumar K.V inst_out: 84073f50717SAneesh Kumar K.V /* 84173f50717SAneesh Kumar K.V * If we had a rename on the server and a parallel lookup 84273f50717SAneesh Kumar K.V * for the new name, then make sure we instantiate with 84373f50717SAneesh Kumar K.V * the new name. ie look up for a/b, while on server somebody 84473f50717SAneesh Kumar K.V * moved b under k and client parallely did a lookup for 84573f50717SAneesh Kumar K.V * k/b. 84673f50717SAneesh Kumar K.V */ 84773f50717SAneesh Kumar K.V res = d_materialise_unique(dentry, inode); 84873f50717SAneesh Kumar K.V if (!IS_ERR(res)) 84973f50717SAneesh Kumar K.V return res; 85073f50717SAneesh Kumar K.V result = PTR_ERR(res); 8519856af8bSAneesh Kumar K.V error_iput: 8529856af8bSAneesh Kumar K.V iput(inode); 853bd238fb4SLatchesar Ionkov error: 854bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 855da977b2cSEric Van Hensbergen 8562bad8471SEric Van Hensbergen return ERR_PTR(result); 8572bad8471SEric Van Hensbergen } 8582bad8471SEric Van Hensbergen 859d9585277SAl Viro static int 860e43ae79cSMiklos Szeredi v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 86130d90494SAl Viro struct file *file, unsigned flags, umode_t mode, 86247237687SAl Viro int *opened) 863e43ae79cSMiklos Szeredi { 864e43ae79cSMiklos Szeredi int err; 865e43ae79cSMiklos Szeredi u32 perm; 866e43ae79cSMiklos Szeredi struct v9fs_inode *v9inode; 867e43ae79cSMiklos Szeredi struct v9fs_session_info *v9ses; 868e43ae79cSMiklos Szeredi struct p9_fid *fid, *inode_fid; 869e43ae79cSMiklos Szeredi struct dentry *res = NULL; 870e43ae79cSMiklos Szeredi 871e43ae79cSMiklos Szeredi if (d_unhashed(dentry)) { 87200cd8dd3SAl Viro res = v9fs_vfs_lookup(dir, dentry, 0); 873e43ae79cSMiklos Szeredi if (IS_ERR(res)) 874d9585277SAl Viro return PTR_ERR(res); 875e43ae79cSMiklos Szeredi 876e43ae79cSMiklos Szeredi if (res) 877e43ae79cSMiklos Szeredi dentry = res; 878e43ae79cSMiklos Szeredi } 879e43ae79cSMiklos Szeredi 880e43ae79cSMiklos Szeredi /* Only creates */ 881e45198a6SAl Viro if (!(flags & O_CREAT) || dentry->d_inode) 882e45198a6SAl Viro return finish_no_open(file, res); 883e43ae79cSMiklos Szeredi 884e43ae79cSMiklos Szeredi err = 0; 885e43ae79cSMiklos Szeredi fid = NULL; 886e43ae79cSMiklos Szeredi v9ses = v9fs_inode2v9ses(dir); 887e43ae79cSMiklos Szeredi perm = unixmode2p9mode(v9ses, mode); 888e43ae79cSMiklos Szeredi fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 889e43ae79cSMiklos Szeredi v9fs_uflags2omode(flags, 890e43ae79cSMiklos Szeredi v9fs_proto_dotu(v9ses))); 891e43ae79cSMiklos Szeredi if (IS_ERR(fid)) { 892e43ae79cSMiklos Szeredi err = PTR_ERR(fid); 893e43ae79cSMiklos Szeredi fid = NULL; 894e43ae79cSMiklos Szeredi goto error; 895e43ae79cSMiklos Szeredi } 896e43ae79cSMiklos Szeredi 897e43ae79cSMiklos Szeredi v9fs_invalidate_inode_attr(dir); 898e43ae79cSMiklos Szeredi v9inode = V9FS_I(dentry->d_inode); 899e43ae79cSMiklos Szeredi mutex_lock(&v9inode->v_mutex); 900e43ae79cSMiklos Szeredi if (v9ses->cache && !v9inode->writeback_fid && 901e43ae79cSMiklos Szeredi ((flags & O_ACCMODE) != O_RDONLY)) { 902e43ae79cSMiklos Szeredi /* 903e43ae79cSMiklos Szeredi * clone a fid and add it to writeback_fid 904e43ae79cSMiklos Szeredi * we do it during open time instead of 905e43ae79cSMiklos Szeredi * page dirty time via write_begin/page_mkwrite 906e43ae79cSMiklos Szeredi * because we want write after unlink usecase 907e43ae79cSMiklos Szeredi * to work. 908e43ae79cSMiklos Szeredi */ 909e43ae79cSMiklos Szeredi inode_fid = v9fs_writeback_fid(dentry); 910e43ae79cSMiklos Szeredi if (IS_ERR(inode_fid)) { 911e43ae79cSMiklos Szeredi err = PTR_ERR(inode_fid); 912e43ae79cSMiklos Szeredi mutex_unlock(&v9inode->v_mutex); 913e43ae79cSMiklos Szeredi goto error; 914e43ae79cSMiklos Szeredi } 915e43ae79cSMiklos Szeredi v9inode->writeback_fid = (void *) inode_fid; 916e43ae79cSMiklos Szeredi } 917e43ae79cSMiklos Szeredi mutex_unlock(&v9inode->v_mutex); 91830d90494SAl Viro err = finish_open(file, dentry, generic_file_open, opened); 91930d90494SAl Viro if (err) 920e43ae79cSMiklos Szeredi goto error; 921e43ae79cSMiklos Szeredi 92230d90494SAl Viro file->private_data = fid; 923e43ae79cSMiklos Szeredi #ifdef CONFIG_9P_FSCACHE 924e43ae79cSMiklos Szeredi if (v9ses->cache) 92530d90494SAl Viro v9fs_cache_inode_set_cookie(dentry->d_inode, file); 926e43ae79cSMiklos Szeredi #endif 927e43ae79cSMiklos Szeredi 92847237687SAl Viro *opened |= FILE_CREATED; 929e43ae79cSMiklos Szeredi out: 930e43ae79cSMiklos Szeredi dput(res); 931d9585277SAl Viro return err; 932e43ae79cSMiklos Szeredi 933e43ae79cSMiklos Szeredi error: 934e43ae79cSMiklos Szeredi if (fid) 935e43ae79cSMiklos Szeredi p9_client_clunk(fid); 936e43ae79cSMiklos Szeredi goto out; 937e43ae79cSMiklos Szeredi } 938e43ae79cSMiklos Szeredi 9392bad8471SEric Van Hensbergen /** 9402bad8471SEric Van Hensbergen * v9fs_vfs_unlink - VFS unlink hook to delete an inode 9412bad8471SEric Van Hensbergen * @i: inode that is being unlinked 94273c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 9432bad8471SEric Van Hensbergen * 9442bad8471SEric Van Hensbergen */ 9452bad8471SEric Van Hensbergen 94653c06f4eSAneesh Kumar K.V int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 9472bad8471SEric Van Hensbergen { 9482bad8471SEric Van Hensbergen return v9fs_remove(i, d, 0); 9492bad8471SEric Van Hensbergen } 9502bad8471SEric Van Hensbergen 9512bad8471SEric Van Hensbergen /** 9522bad8471SEric Van Hensbergen * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 9532bad8471SEric Van Hensbergen * @i: inode that is being unlinked 95473c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 9552bad8471SEric Van Hensbergen * 9562bad8471SEric Van Hensbergen */ 9572bad8471SEric Van Hensbergen 95853c06f4eSAneesh Kumar K.V int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 9592bad8471SEric Van Hensbergen { 96048e370ffSAneesh Kumar K.V return v9fs_remove(i, d, AT_REMOVEDIR); 9612bad8471SEric Van Hensbergen } 9622bad8471SEric Van Hensbergen 9632bad8471SEric Van Hensbergen /** 9642bad8471SEric Van Hensbergen * v9fs_vfs_rename - VFS hook to rename an inode 9652bad8471SEric Van Hensbergen * @old_dir: old dir inode 9662bad8471SEric Van Hensbergen * @old_dentry: old dentry 9672bad8471SEric Van Hensbergen * @new_dir: new dir inode 9682bad8471SEric Van Hensbergen * @new_dentry: new dentry 9692bad8471SEric Van Hensbergen * 9702bad8471SEric Van Hensbergen */ 9712bad8471SEric Van Hensbergen 97253c06f4eSAneesh Kumar K.V int 9732bad8471SEric Van Hensbergen v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 9742bad8471SEric Van Hensbergen struct inode *new_dir, struct dentry *new_dentry) 9752bad8471SEric Van Hensbergen { 976d28c61f0SAneesh Kumar K.V int retval; 977bd238fb4SLatchesar Ionkov struct inode *old_inode; 978b271ec47SAneesh Kumar K.V struct inode *new_inode; 979bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 980bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 981bd238fb4SLatchesar Ionkov struct p9_fid *olddirfid; 982bd238fb4SLatchesar Ionkov struct p9_fid *newdirfid; 983bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 9842bad8471SEric Van Hensbergen 9855d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "\n"); 986bd238fb4SLatchesar Ionkov retval = 0; 987bd238fb4SLatchesar Ionkov old_inode = old_dentry->d_inode; 988b271ec47SAneesh Kumar K.V new_inode = new_dentry->d_inode; 989bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(old_inode); 990bd238fb4SLatchesar Ionkov oldfid = v9fs_fid_lookup(old_dentry); 991da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 992da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 993da977b2cSEric Van Hensbergen 994da977b2cSEric Van Hensbergen olddirfid = v9fs_fid_clone(old_dentry->d_parent); 995da977b2cSEric Van Hensbergen if (IS_ERR(olddirfid)) { 996da977b2cSEric Van Hensbergen retval = PTR_ERR(olddirfid); 997bd238fb4SLatchesar Ionkov goto done; 998da977b2cSEric Van Hensbergen } 999da977b2cSEric Van Hensbergen 1000da977b2cSEric Van Hensbergen newdirfid = v9fs_fid_clone(new_dentry->d_parent); 1001da977b2cSEric Van Hensbergen if (IS_ERR(newdirfid)) { 1002da977b2cSEric Van Hensbergen retval = PTR_ERR(newdirfid); 1003bd238fb4SLatchesar Ionkov goto clunk_olddir; 10042bad8471SEric Van Hensbergen } 10052bad8471SEric Van Hensbergen 1006a534c8d1SAneesh Kumar K.V down_write(&v9ses->rename_sem); 10074681dbdaSSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 10089e8fb38eSAneesh Kumar K.V retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 10099e8fb38eSAneesh Kumar K.V newdirfid, new_dentry->d_name.name); 10109e8fb38eSAneesh Kumar K.V if (retval == -EOPNOTSUPP) 10114681dbdaSSripathi Kodi retval = p9_client_rename(oldfid, newdirfid, 10129e8fb38eSAneesh Kumar K.V new_dentry->d_name.name); 10139e8fb38eSAneesh Kumar K.V if (retval != -EOPNOTSUPP) 10144681dbdaSSripathi Kodi goto clunk_newdir; 10154681dbdaSSripathi Kodi } 1016a534c8d1SAneesh Kumar K.V if (old_dentry->d_parent != new_dentry->d_parent) { 1017a534c8d1SAneesh Kumar K.V /* 1018a534c8d1SAneesh Kumar K.V * 9P .u can only handle file rename in the same directory 1019a534c8d1SAneesh Kumar K.V */ 10204681dbdaSSripathi Kodi 10215d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 1022621997cdSEric Van Hensbergen retval = -EXDEV; 1023bd238fb4SLatchesar Ionkov goto clunk_newdir; 10242bad8471SEric Van Hensbergen } 1025531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 1026ba17674fSLatchesar Ionkov wstat.muid = v9ses->uname; 1027531b1094SLatchesar Ionkov wstat.name = (char *) new_dentry->d_name.name; 1028bd238fb4SLatchesar Ionkov retval = p9_client_wstat(oldfid, &wstat); 10292bad8471SEric Van Hensbergen 1030bd238fb4SLatchesar Ionkov clunk_newdir: 1031b271ec47SAneesh Kumar K.V if (!retval) { 1032b271ec47SAneesh Kumar K.V if (new_inode) { 1033b271ec47SAneesh Kumar K.V if (S_ISDIR(new_inode->i_mode)) 1034b271ec47SAneesh Kumar K.V clear_nlink(new_inode); 1035b271ec47SAneesh Kumar K.V else 1036b271ec47SAneesh Kumar K.V drop_nlink(new_inode); 1037b271ec47SAneesh Kumar K.V } 1038b271ec47SAneesh Kumar K.V if (S_ISDIR(old_inode->i_mode)) { 1039b271ec47SAneesh Kumar K.V if (!new_inode) 1040b271ec47SAneesh Kumar K.V inc_nlink(new_dir); 1041b271ec47SAneesh Kumar K.V drop_nlink(old_dir); 1042b271ec47SAneesh Kumar K.V } 10433bc86de3SAneesh Kumar K.V v9fs_invalidate_inode_attr(old_inode); 1044d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(old_dir); 1045d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(new_dir); 10463bc86de3SAneesh Kumar K.V 1047a534c8d1SAneesh Kumar K.V /* successful rename */ 1048a534c8d1SAneesh Kumar K.V d_move(old_dentry, new_dentry); 1049b271ec47SAneesh Kumar K.V } 1050a534c8d1SAneesh Kumar K.V up_write(&v9ses->rename_sem); 105122150c4fSLatchesar Ionkov p9_client_clunk(newdirfid); 10522bad8471SEric Van Hensbergen 1053bd238fb4SLatchesar Ionkov clunk_olddir: 105422150c4fSLatchesar Ionkov p9_client_clunk(olddirfid); 10552bad8471SEric Van Hensbergen 1056bd238fb4SLatchesar Ionkov done: 10572bad8471SEric Van Hensbergen return retval; 10582bad8471SEric Van Hensbergen } 10592bad8471SEric Van Hensbergen 10602bad8471SEric Van Hensbergen /** 1061943ffb58SAdrian Bunk * v9fs_vfs_getattr - retrieve file metadata 1062ee443996SEric Van Hensbergen * @mnt: mount information 1063ee443996SEric Van Hensbergen * @dentry: file to get attributes on 1064ee443996SEric Van Hensbergen * @stat: metadata structure to populate 10652bad8471SEric Van Hensbergen * 10662bad8471SEric Van Hensbergen */ 10672bad8471SEric Van Hensbergen 10682bad8471SEric Van Hensbergen static int 10692bad8471SEric Van Hensbergen v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 10702bad8471SEric Van Hensbergen struct kstat *stat) 10712bad8471SEric Van Hensbergen { 1072bd238fb4SLatchesar Ionkov int err; 1073bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1074bd238fb4SLatchesar Ionkov struct p9_fid *fid; 107551a87c55SEric Van Hensbergen struct p9_wstat *st; 10762bad8471SEric Van Hensbergen 10775d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1078bd238fb4SLatchesar Ionkov err = -EPERM; 107942869c8aSAneesh Kumar K.V v9ses = v9fs_dentry2v9ses(dentry); 1080a1211908SAneesh Kumar K.V if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1081a1211908SAneesh Kumar K.V generic_fillattr(dentry->d_inode, stat); 1082a1211908SAneesh Kumar K.V return 0; 1083a1211908SAneesh Kumar K.V } 1084bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1085da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 1086da977b2cSEric Van Hensbergen return PTR_ERR(fid); 10872bad8471SEric Van Hensbergen 1088bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 1089bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 1090bd238fb4SLatchesar Ionkov return PTR_ERR(st); 10912bad8471SEric Van Hensbergen 1092bd238fb4SLatchesar Ionkov v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 10932bad8471SEric Van Hensbergen generic_fillattr(dentry->d_inode, stat); 10942bad8471SEric Van Hensbergen 109562b2be59SLatchesar Ionkov p9stat_free(st); 1096bd238fb4SLatchesar Ionkov kfree(st); 1097bd238fb4SLatchesar Ionkov return 0; 10982bad8471SEric Van Hensbergen } 10992bad8471SEric Van Hensbergen 11002bad8471SEric Van Hensbergen /** 11012bad8471SEric Van Hensbergen * v9fs_vfs_setattr - set file metadata 11022bad8471SEric Van Hensbergen * @dentry: file whose metadata to set 11032bad8471SEric Van Hensbergen * @iattr: metadata assignment structure 11042bad8471SEric Van Hensbergen * 11052bad8471SEric Van Hensbergen */ 11062bad8471SEric Van Hensbergen 11072bad8471SEric Van Hensbergen static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 11082bad8471SEric Van Hensbergen { 1109bd238fb4SLatchesar Ionkov int retval; 1110bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1111bd238fb4SLatchesar Ionkov struct p9_fid *fid; 1112bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 11132bad8471SEric Van Hensbergen 11145d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "\n"); 1115059c138bSAneesh Kumar K.V retval = inode_change_ok(dentry->d_inode, iattr); 1116059c138bSAneesh Kumar K.V if (retval) 1117059c138bSAneesh Kumar K.V return retval; 1118059c138bSAneesh Kumar K.V 1119bd238fb4SLatchesar Ionkov retval = -EPERM; 112042869c8aSAneesh Kumar K.V v9ses = v9fs_dentry2v9ses(dentry); 1121bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1122da977b2cSEric Van Hensbergen if(IS_ERR(fid)) 1123da977b2cSEric Van Hensbergen return PTR_ERR(fid); 11242bad8471SEric Van Hensbergen 1125531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 11262bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MODE) 1127531b1094SLatchesar Ionkov wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 11282bad8471SEric Van Hensbergen 11292bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MTIME) 1130531b1094SLatchesar Ionkov wstat.mtime = iattr->ia_mtime.tv_sec; 11312bad8471SEric Van Hensbergen 11322bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_ATIME) 1133531b1094SLatchesar Ionkov wstat.atime = iattr->ia_atime.tv_sec; 11342bad8471SEric Van Hensbergen 11352bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_SIZE) 1136531b1094SLatchesar Ionkov wstat.length = iattr->ia_size; 11372bad8471SEric Van Hensbergen 1138dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 1139531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_UID) 1140531b1094SLatchesar Ionkov wstat.n_uid = iattr->ia_uid; 11412bad8471SEric Van Hensbergen 1142531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_GID) 1143531b1094SLatchesar Ionkov wstat.n_gid = iattr->ia_gid; 11442bad8471SEric Van Hensbergen } 1145059c138bSAneesh Kumar K.V 11463dc5436aSAneesh Kumar K.V /* Write all dirty data */ 11473dc5436aSAneesh Kumar K.V if (S_ISREG(dentry->d_inode->i_mode)) 11483dc5436aSAneesh Kumar K.V filemap_write_and_wait(dentry->d_inode->i_mapping); 11493dc5436aSAneesh Kumar K.V 1150f10fc50fSAneesh Kumar K.V retval = p9_client_wstat(fid, &wstat); 1151f10fc50fSAneesh Kumar K.V if (retval < 0) 1152f10fc50fSAneesh Kumar K.V return retval; 1153059c138bSAneesh Kumar K.V 1154059c138bSAneesh Kumar K.V if ((iattr->ia_valid & ATTR_SIZE) && 1155059c138bSAneesh Kumar K.V iattr->ia_size != i_size_read(dentry->d_inode)) 1156059c138bSAneesh Kumar K.V truncate_setsize(dentry->d_inode, iattr->ia_size); 1157059c138bSAneesh Kumar K.V 1158f10fc50fSAneesh Kumar K.V v9fs_invalidate_inode_attr(dentry->d_inode); 11591025774cSChristoph Hellwig 11601025774cSChristoph Hellwig setattr_copy(dentry->d_inode, iattr); 11611025774cSChristoph Hellwig mark_inode_dirty(dentry->d_inode); 11621025774cSChristoph Hellwig return 0; 11632bad8471SEric Van Hensbergen } 11642bad8471SEric Van Hensbergen 11652bad8471SEric Van Hensbergen /** 1166531b1094SLatchesar Ionkov * v9fs_stat2inode - populate an inode structure with mistat info 1167531b1094SLatchesar Ionkov * @stat: Plan 9 metadata (mistat) structure 11682bad8471SEric Van Hensbergen * @inode: inode to populate 11692bad8471SEric Van Hensbergen * @sb: superblock of filesystem 11702bad8471SEric Van Hensbergen * 11712bad8471SEric Van Hensbergen */ 11722bad8471SEric Van Hensbergen 11732bad8471SEric Van Hensbergen void 117451a87c55SEric Van Hensbergen v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 11752bad8471SEric Van Hensbergen struct super_block *sb) 11762bad8471SEric Van Hensbergen { 11773eda0de6SAl Viro umode_t mode; 1178531b1094SLatchesar Ionkov char ext[32]; 11795717144aSAneesh Kumar K.V char tag_name[14]; 11805717144aSAneesh Kumar K.V unsigned int i_nlink; 11812bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 1182b3cbea03SAneesh Kumar K.V struct v9fs_inode *v9inode = V9FS_I(inode); 11832bad8471SEric Van Hensbergen 1184bfe86848SMiklos Szeredi set_nlink(inode, 1); 11852bad8471SEric Van Hensbergen 1186531b1094SLatchesar Ionkov inode->i_atime.tv_sec = stat->atime; 1187531b1094SLatchesar Ionkov inode->i_mtime.tv_sec = stat->mtime; 1188531b1094SLatchesar Ionkov inode->i_ctime.tv_sec = stat->mtime; 11892bad8471SEric Van Hensbergen 1190bd32b82dSLatchesar Ionkov inode->i_uid = v9ses->dfltuid; 1191bd32b82dSLatchesar Ionkov inode->i_gid = v9ses->dfltgid; 11922bad8471SEric Van Hensbergen 1193dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 1194531b1094SLatchesar Ionkov inode->i_uid = stat->n_uid; 1195531b1094SLatchesar Ionkov inode->i_gid = stat->n_gid; 1196531b1094SLatchesar Ionkov } 11975717144aSAneesh Kumar K.V if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 11985717144aSAneesh Kumar K.V if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 11995717144aSAneesh Kumar K.V /* 12005717144aSAneesh Kumar K.V * Hadlink support got added later to 12015717144aSAneesh Kumar K.V * to the .u extension. So there can be 12025717144aSAneesh Kumar K.V * server out there that doesn't support 12035717144aSAneesh Kumar K.V * this even with .u extension. So check 12045717144aSAneesh Kumar K.V * for non NULL stat->extension 12055717144aSAneesh Kumar K.V */ 12065717144aSAneesh Kumar K.V strncpy(ext, stat->extension, sizeof(ext)); 12075717144aSAneesh Kumar K.V /* HARDLINKCOUNT %u */ 12085717144aSAneesh Kumar K.V sscanf(ext, "%13s %u", tag_name, &i_nlink); 12095717144aSAneesh Kumar K.V if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 1210bfe86848SMiklos Szeredi set_nlink(inode, i_nlink); 12115717144aSAneesh Kumar K.V } 12125717144aSAneesh Kumar K.V } 1213df345c67SAneesh Kumar K.V mode = p9mode2perm(v9ses, stat); 121445089142SAneesh Kumar K.V mode |= inode->i_mode & ~S_IALLUGO; 121545089142SAneesh Kumar K.V inode->i_mode = mode; 12167549ae3eSAbhishek Kulkarni i_size_write(inode, stat->length); 12172bad8471SEric Van Hensbergen 1218bd238fb4SLatchesar Ionkov /* not real number of blocks, but 512 byte ones ... */ 12197549ae3eSAbhishek Kulkarni inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 1220b3cbea03SAneesh Kumar K.V v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 12212bad8471SEric Van Hensbergen } 12222bad8471SEric Van Hensbergen 12232bad8471SEric Van Hensbergen /** 12242bad8471SEric Van Hensbergen * v9fs_qid2ino - convert qid into inode number 12252bad8471SEric Van Hensbergen * @qid: qid to hash 12262bad8471SEric Van Hensbergen * 12272bad8471SEric Van Hensbergen * BUG: potential for inode number collisions? 12282bad8471SEric Van Hensbergen */ 12292bad8471SEric Van Hensbergen 1230bd238fb4SLatchesar Ionkov ino_t v9fs_qid2ino(struct p9_qid *qid) 12312bad8471SEric Van Hensbergen { 12322bad8471SEric Van Hensbergen u64 path = qid->path + 2; 12332bad8471SEric Van Hensbergen ino_t i = 0; 12342bad8471SEric Van Hensbergen 12352bad8471SEric Van Hensbergen if (sizeof(ino_t) == sizeof(path)) 12362bad8471SEric Van Hensbergen memcpy(&i, &path, sizeof(ino_t)); 12372bad8471SEric Van Hensbergen else 12382bad8471SEric Van Hensbergen i = (ino_t) (path ^ (path >> 32)); 12392bad8471SEric Van Hensbergen 12402bad8471SEric Van Hensbergen return i; 12412bad8471SEric Van Hensbergen } 12422bad8471SEric Van Hensbergen 12432bad8471SEric Van Hensbergen /** 12442bad8471SEric Van Hensbergen * v9fs_readlink - read a symlink's location (internal version) 12452bad8471SEric Van Hensbergen * @dentry: dentry for symlink 124673c592b9SEric Van Hensbergen * @buffer: buffer to load symlink location into 12472bad8471SEric Van Hensbergen * @buflen: length of buffer 12482bad8471SEric Van Hensbergen * 12492bad8471SEric Van Hensbergen */ 12502bad8471SEric Van Hensbergen 12512bad8471SEric Van Hensbergen static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 12522bad8471SEric Van Hensbergen { 1253bd238fb4SLatchesar Ionkov int retval; 12542bad8471SEric Van Hensbergen 1255bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1256bd238fb4SLatchesar Ionkov struct p9_fid *fid; 125751a87c55SEric Van Hensbergen struct p9_wstat *st; 12582bad8471SEric Van Hensbergen 12595d385153SJoe Perches p9_debug(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 1260bd238fb4SLatchesar Ionkov retval = -EPERM; 126142869c8aSAneesh Kumar K.V v9ses = v9fs_dentry2v9ses(dentry); 1262bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1263da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 1264da977b2cSEric Van Hensbergen return PTR_ERR(fid); 12652bad8471SEric Van Hensbergen 1266329176ccSM. Mohan Kumar if (!v9fs_proto_dotu(v9ses)) 1267bd238fb4SLatchesar Ionkov return -EBADF; 12682bad8471SEric Van Hensbergen 1269bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 1270bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 1271bd238fb4SLatchesar Ionkov return PTR_ERR(st); 12722bad8471SEric Van Hensbergen 1273bd238fb4SLatchesar Ionkov if (!(st->mode & P9_DMSYMLINK)) { 12742bad8471SEric Van Hensbergen retval = -EINVAL; 1275bd238fb4SLatchesar Ionkov goto done; 12762bad8471SEric Van Hensbergen } 12772bad8471SEric Van Hensbergen 12782bad8471SEric Van Hensbergen /* copy extension buffer into buffer */ 127951a87c55SEric Van Hensbergen strncpy(buffer, st->extension, buflen); 12802bad8471SEric Van Hensbergen 12815d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "%s -> %s (%s)\n", 12825d385153SJoe Perches dentry->d_name.name, st->extension, buffer); 1283bd238fb4SLatchesar Ionkov 12842511cd0bSMartin Stava retval = strnlen(buffer, buflen); 1285bd238fb4SLatchesar Ionkov done: 128662b2be59SLatchesar Ionkov p9stat_free(st); 1287bd238fb4SLatchesar Ionkov kfree(st); 12882bad8471SEric Van Hensbergen return retval; 12892bad8471SEric Van Hensbergen } 12902bad8471SEric Van Hensbergen 12912bad8471SEric Van Hensbergen /** 12922bad8471SEric Van Hensbergen * v9fs_vfs_follow_link - follow a symlink path 12932bad8471SEric Van Hensbergen * @dentry: dentry for symlink 12942bad8471SEric Van Hensbergen * @nd: nameidata 12952bad8471SEric Van Hensbergen * 12962bad8471SEric Van Hensbergen */ 12972bad8471SEric Van Hensbergen 12982bad8471SEric Van Hensbergen static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 12992bad8471SEric Van Hensbergen { 13002bad8471SEric Van Hensbergen int len = 0; 13012bad8471SEric Van Hensbergen char *link = __getname(); 13022bad8471SEric Van Hensbergen 13035d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name); 13042bad8471SEric Van Hensbergen 13052bad8471SEric Van Hensbergen if (!link) 13062bad8471SEric Van Hensbergen link = ERR_PTR(-ENOMEM); 13072bad8471SEric Van Hensbergen else { 130816cce6d2SLatchesar Ionkov len = v9fs_readlink(dentry, link, PATH_MAX); 13092bad8471SEric Van Hensbergen 13102bad8471SEric Van Hensbergen if (len < 0) { 1311ce44eeb6SDavi Arnaut __putname(link); 13122bad8471SEric Van Hensbergen link = ERR_PTR(len); 13132bad8471SEric Van Hensbergen } else 13142511cd0bSMartin Stava link[min(len, PATH_MAX-1)] = 0; 13152bad8471SEric Van Hensbergen } 13162bad8471SEric Van Hensbergen nd_set_link(nd, link); 13172bad8471SEric Van Hensbergen 13182bad8471SEric Van Hensbergen return NULL; 13192bad8471SEric Van Hensbergen } 13202bad8471SEric Van Hensbergen 13212bad8471SEric Van Hensbergen /** 13222bad8471SEric Van Hensbergen * v9fs_vfs_put_link - release a symlink path 13232bad8471SEric Van Hensbergen * @dentry: dentry for symlink 13242bad8471SEric Van Hensbergen * @nd: nameidata 1325ee443996SEric Van Hensbergen * @p: unused 13262bad8471SEric Van Hensbergen * 13272bad8471SEric Van Hensbergen */ 13282bad8471SEric Van Hensbergen 132953c06f4eSAneesh Kumar K.V void 1330ee443996SEric Van Hensbergen v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 13312bad8471SEric Van Hensbergen { 13322bad8471SEric Van Hensbergen char *s = nd_get_link(nd); 13332bad8471SEric Van Hensbergen 13345d385153SJoe Perches p9_debug(P9_DEBUG_VFS, " %s %s\n", 13355d385153SJoe Perches dentry->d_name.name, IS_ERR(s) ? "<error>" : s); 13362bad8471SEric Van Hensbergen if (!IS_ERR(s)) 1337ce44eeb6SDavi Arnaut __putname(s); 13382bad8471SEric Van Hensbergen } 13392bad8471SEric Van Hensbergen 1340ee443996SEric Van Hensbergen /** 1341ee443996SEric Van Hensbergen * v9fs_vfs_mkspecial - create a special file 1342ee443996SEric Van Hensbergen * @dir: inode to create special file in 1343ee443996SEric Van Hensbergen * @dentry: dentry to create 1344ee443996SEric Van Hensbergen * @mode: mode to create special file 1345ee443996SEric Van Hensbergen * @extension: 9p2000.u format extension string representing special file 1346ee443996SEric Van Hensbergen * 1347ee443996SEric Van Hensbergen */ 1348ee443996SEric Van Hensbergen 1349531b1094SLatchesar Ionkov static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1350c2837de7SAl Viro u32 perm, const char *extension) 1351531b1094SLatchesar Ionkov { 1352bd238fb4SLatchesar Ionkov struct p9_fid *fid; 1353d28c61f0SAneesh Kumar K.V struct v9fs_session_info *v9ses; 1354531b1094SLatchesar Ionkov 13556a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 1356dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) { 13575d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "not extended\n"); 13586a3124a3SLatchesar Ionkov return -EPERM; 1359531b1094SLatchesar Ionkov } 1360531b1094SLatchesar Ionkov 1361bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1362bd238fb4SLatchesar Ionkov P9_OREAD); 1363bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) 1364bd238fb4SLatchesar Ionkov return PTR_ERR(fid); 1365da977b2cSEric Van Hensbergen 1366d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(dir); 1367bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 13686a3124a3SLatchesar Ionkov return 0; 1369531b1094SLatchesar Ionkov } 1370531b1094SLatchesar Ionkov 1371531b1094SLatchesar Ionkov /** 1372531b1094SLatchesar Ionkov * v9fs_vfs_symlink - helper function to create symlinks 1373531b1094SLatchesar Ionkov * @dir: directory inode containing symlink 1374531b1094SLatchesar Ionkov * @dentry: dentry for symlink 1375531b1094SLatchesar Ionkov * @symname: symlink data 1376531b1094SLatchesar Ionkov * 1377ee443996SEric Van Hensbergen * See Also: 9P2000.u RFC for more information 1378531b1094SLatchesar Ionkov * 1379531b1094SLatchesar Ionkov */ 1380531b1094SLatchesar Ionkov 1381531b1094SLatchesar Ionkov static int 1382531b1094SLatchesar Ionkov v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1383531b1094SLatchesar Ionkov { 13845d385153SJoe Perches p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n", 13855d385153SJoe Perches dir->i_ino, dentry->d_name.name, symname); 1386531b1094SLatchesar Ionkov 1387c2837de7SAl Viro return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1388531b1094SLatchesar Ionkov } 1389531b1094SLatchesar Ionkov 13902bad8471SEric Van Hensbergen /** 13912bad8471SEric Van Hensbergen * v9fs_vfs_link - create a hardlink 13922bad8471SEric Van Hensbergen * @old_dentry: dentry for file to link to 13932bad8471SEric Van Hensbergen * @dir: inode destination for new link 139473c592b9SEric Van Hensbergen * @dentry: dentry for link 13952bad8471SEric Van Hensbergen * 13962bad8471SEric Van Hensbergen */ 13972bad8471SEric Van Hensbergen 13982bad8471SEric Van Hensbergen static int 13992bad8471SEric Van Hensbergen v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 14002bad8471SEric Van Hensbergen struct dentry *dentry) 14012bad8471SEric Van Hensbergen { 1402531b1094SLatchesar Ionkov int retval; 1403531b1094SLatchesar Ionkov char *name; 1404d28c61f0SAneesh Kumar K.V struct p9_fid *oldfid; 14052bad8471SEric Van Hensbergen 14065d385153SJoe Perches p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n", 14075d385153SJoe Perches dir->i_ino, dentry->d_name.name, old_dentry->d_name.name); 14082bad8471SEric Van Hensbergen 1409da977b2cSEric Van Hensbergen oldfid = v9fs_fid_clone(old_dentry); 1410da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 1411da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 14122bad8471SEric Van Hensbergen 1413531b1094SLatchesar Ionkov name = __getname(); 1414da977b2cSEric Van Hensbergen if (unlikely(!name)) { 1415da977b2cSEric Van Hensbergen retval = -ENOMEM; 1416da977b2cSEric Van Hensbergen goto clunk_fid; 1417da977b2cSEric Van Hensbergen } 14180710d36aSFlorin Malita 141916cce6d2SLatchesar Ionkov sprintf(name, "%d\n", oldfid->fid); 1420bd238fb4SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1421531b1094SLatchesar Ionkov __putname(name); 1422c06c066aSAneesh Kumar K.V if (!retval) { 1423c06c066aSAneesh Kumar K.V v9fs_refresh_inode(oldfid, old_dentry->d_inode); 1424d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(dir); 1425c06c066aSAneesh Kumar K.V } 1426da977b2cSEric Van Hensbergen clunk_fid: 1427bd238fb4SLatchesar Ionkov p9_client_clunk(oldfid); 14282bad8471SEric Van Hensbergen return retval; 14292bad8471SEric Van Hensbergen } 14302bad8471SEric Van Hensbergen 14312bad8471SEric Van Hensbergen /** 14322bad8471SEric Van Hensbergen * v9fs_vfs_mknod - create a special file 14332bad8471SEric Van Hensbergen * @dir: inode destination for new link 14342bad8471SEric Van Hensbergen * @dentry: dentry for file 14352bad8471SEric Van Hensbergen * @mode: mode for creation 1436ee443996SEric Van Hensbergen * @rdev: device associated with special file 14372bad8471SEric Van Hensbergen * 14382bad8471SEric Van Hensbergen */ 14392bad8471SEric Van Hensbergen 14402bad8471SEric Van Hensbergen static int 14411a67aafbSAl Viro v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 14422bad8471SEric Van Hensbergen { 1443c2837de7SAl Viro struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1444531b1094SLatchesar Ionkov int retval; 1445531b1094SLatchesar Ionkov char *name; 1446c2837de7SAl Viro u32 perm; 14472bad8471SEric Van Hensbergen 1448609eac1cSLinus Torvalds p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n", 14495d385153SJoe Perches dir->i_ino, dentry->d_name.name, mode, 14505d385153SJoe Perches MAJOR(rdev), MINOR(rdev)); 14512bad8471SEric Van Hensbergen 1452531b1094SLatchesar Ionkov if (!new_valid_dev(rdev)) 1453531b1094SLatchesar Ionkov return -EINVAL; 145473c592b9SEric Van Hensbergen 1455531b1094SLatchesar Ionkov name = __getname(); 1456c0291a05SEugene Teo if (!name) 1457c0291a05SEugene Teo return -ENOMEM; 14582bad8471SEric Van Hensbergen /* build extension */ 14592bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 1460531b1094SLatchesar Ionkov sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 14612bad8471SEric Van Hensbergen else if (S_ISCHR(mode)) 1462531b1094SLatchesar Ionkov sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 146373c592b9SEric Van Hensbergen else if (S_ISFIFO(mode)) 1464531b1094SLatchesar Ionkov *name = 0; 146575cc5c9bSVenkateswararao Jujjuri else if (S_ISSOCK(mode)) 146675cc5c9bSVenkateswararao Jujjuri *name = 0; 14672bad8471SEric Van Hensbergen else { 1468531b1094SLatchesar Ionkov __putname(name); 1469531b1094SLatchesar Ionkov return -EINVAL; 14702bad8471SEric Van Hensbergen } 14712bad8471SEric Van Hensbergen 1472c2837de7SAl Viro perm = unixmode2p9mode(v9ses, mode); 1473c2837de7SAl Viro retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1474531b1094SLatchesar Ionkov __putname(name); 14752bad8471SEric Van Hensbergen 14762bad8471SEric Van Hensbergen return retval; 14772bad8471SEric Van Hensbergen } 14782bad8471SEric Van Hensbergen 1479b3cbea03SAneesh Kumar K.V int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1480b3cbea03SAneesh Kumar K.V { 148145089142SAneesh Kumar K.V int umode; 148245089142SAneesh Kumar K.V dev_t rdev; 1483b3cbea03SAneesh Kumar K.V loff_t i_size; 1484b3cbea03SAneesh Kumar K.V struct p9_wstat *st; 1485b3cbea03SAneesh Kumar K.V struct v9fs_session_info *v9ses; 1486b3cbea03SAneesh Kumar K.V 1487b3cbea03SAneesh Kumar K.V v9ses = v9fs_inode2v9ses(inode); 1488b3cbea03SAneesh Kumar K.V st = p9_client_stat(fid); 1489b3cbea03SAneesh Kumar K.V if (IS_ERR(st)) 1490b3cbea03SAneesh Kumar K.V return PTR_ERR(st); 149145089142SAneesh Kumar K.V /* 149245089142SAneesh Kumar K.V * Don't update inode if the file type is different 149345089142SAneesh Kumar K.V */ 149445089142SAneesh Kumar K.V umode = p9mode2unixmode(v9ses, st, &rdev); 149545089142SAneesh Kumar K.V if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 149645089142SAneesh Kumar K.V goto out; 1497b3cbea03SAneesh Kumar K.V 1498b3cbea03SAneesh Kumar K.V spin_lock(&inode->i_lock); 1499b3cbea03SAneesh Kumar K.V /* 1500b3cbea03SAneesh Kumar K.V * We don't want to refresh inode->i_size, 1501b3cbea03SAneesh Kumar K.V * because we may have cached data 1502b3cbea03SAneesh Kumar K.V */ 1503b3cbea03SAneesh Kumar K.V i_size = inode->i_size; 1504b3cbea03SAneesh Kumar K.V v9fs_stat2inode(st, inode, inode->i_sb); 1505b3cbea03SAneesh Kumar K.V if (v9ses->cache) 1506b3cbea03SAneesh Kumar K.V inode->i_size = i_size; 1507b3cbea03SAneesh Kumar K.V spin_unlock(&inode->i_lock); 150845089142SAneesh Kumar K.V out: 1509b3cbea03SAneesh Kumar K.V p9stat_free(st); 1510b3cbea03SAneesh Kumar K.V kfree(st); 1511b3cbea03SAneesh Kumar K.V return 0; 1512b3cbea03SAneesh Kumar K.V } 1513b3cbea03SAneesh Kumar K.V 15149b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotu = { 15159b6533c9SSripathi Kodi .create = v9fs_vfs_create, 15169b6533c9SSripathi Kodi .lookup = v9fs_vfs_lookup, 1517e43ae79cSMiklos Szeredi .atomic_open = v9fs_vfs_atomic_open, 15189b6533c9SSripathi Kodi .symlink = v9fs_vfs_symlink, 151950cc42ffSVenkateswararao Jujjuri (JV) .link = v9fs_vfs_link, 15209b6533c9SSripathi Kodi .unlink = v9fs_vfs_unlink, 15219b6533c9SSripathi Kodi .mkdir = v9fs_vfs_mkdir, 15229b6533c9SSripathi Kodi .rmdir = v9fs_vfs_rmdir, 15231d76e313SAneesh Kumar K.V .mknod = v9fs_vfs_mknod, 15249b6533c9SSripathi Kodi .rename = v9fs_vfs_rename, 15259b6533c9SSripathi Kodi .getattr = v9fs_vfs_getattr, 15269b6533c9SSripathi Kodi .setattr = v9fs_vfs_setattr, 15279b6533c9SSripathi Kodi }; 15289b6533c9SSripathi Kodi 1529754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations = { 1530b501611aSEric Van Hensbergen .create = v9fs_vfs_create, 1531b501611aSEric Van Hensbergen .lookup = v9fs_vfs_lookup, 1532e43ae79cSMiklos Szeredi .atomic_open = v9fs_vfs_atomic_open, 1533b501611aSEric Van Hensbergen .unlink = v9fs_vfs_unlink, 1534b501611aSEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 1535b501611aSEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 1536b501611aSEric Van Hensbergen .mknod = v9fs_vfs_mknod, 1537b501611aSEric Van Hensbergen .rename = v9fs_vfs_rename, 1538b501611aSEric Van Hensbergen .getattr = v9fs_vfs_getattr, 1539b501611aSEric Van Hensbergen .setattr = v9fs_vfs_setattr, 1540b501611aSEric Van Hensbergen }; 1541b501611aSEric Van Hensbergen 1542754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations = { 15432bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 15442bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 15452bad8471SEric Van Hensbergen }; 15462bad8471SEric Van Hensbergen 1547754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations = { 1548204f2f0eSAl Viro .readlink = generic_readlink, 15492bad8471SEric Van Hensbergen .follow_link = v9fs_vfs_follow_link, 15502bad8471SEric Van Hensbergen .put_link = v9fs_vfs_put_link, 15512bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 15522bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 15532bad8471SEric Van Hensbergen }; 15549b6533c9SSripathi Kodi 1555