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 1952e4bef41SEric Van Hensbergen if (extended) { 1962e4bef41SEric Van Hensbergen if (uflags & O_EXCL) 1972e4bef41SEric Van Hensbergen ret |= P9_OEXCL; 1982e4bef41SEric Van Hensbergen 1996a3124a3SLatchesar Ionkov if (uflags & O_APPEND) 200bd238fb4SLatchesar Ionkov ret |= P9_OAPPEND; 2012e4bef41SEric Van Hensbergen } 2026a3124a3SLatchesar Ionkov 2036a3124a3SLatchesar Ionkov return ret; 2046a3124a3SLatchesar Ionkov } 2056a3124a3SLatchesar Ionkov 2062bad8471SEric Van Hensbergen /** 207531b1094SLatchesar Ionkov * v9fs_blank_wstat - helper function to setup a 9P stat structure 208531b1094SLatchesar Ionkov * @wstat: structure to initialize 2092bad8471SEric Van Hensbergen * 2102bad8471SEric Van Hensbergen */ 2112bad8471SEric Van Hensbergen 2127a4439c4SM. Mohan Kumar void 213bd238fb4SLatchesar Ionkov v9fs_blank_wstat(struct p9_wstat *wstat) 2142bad8471SEric Van Hensbergen { 215531b1094SLatchesar Ionkov wstat->type = ~0; 216531b1094SLatchesar Ionkov wstat->dev = ~0; 217531b1094SLatchesar Ionkov wstat->qid.type = ~0; 218531b1094SLatchesar Ionkov wstat->qid.version = ~0; 219531b1094SLatchesar Ionkov *((long long *)&wstat->qid.path) = ~0; 220531b1094SLatchesar Ionkov wstat->mode = ~0; 221531b1094SLatchesar Ionkov wstat->atime = ~0; 222531b1094SLatchesar Ionkov wstat->mtime = ~0; 223531b1094SLatchesar Ionkov wstat->length = ~0; 224531b1094SLatchesar Ionkov wstat->name = NULL; 225531b1094SLatchesar Ionkov wstat->uid = NULL; 226531b1094SLatchesar Ionkov wstat->gid = NULL; 227531b1094SLatchesar Ionkov wstat->muid = NULL; 228447c5094SEric W. Biederman wstat->n_uid = INVALID_UID; 229447c5094SEric W. Biederman wstat->n_gid = INVALID_GID; 230447c5094SEric W. Biederman wstat->n_muid = INVALID_UID; 231531b1094SLatchesar Ionkov wstat->extension = NULL; 2322bad8471SEric Van Hensbergen } 2332bad8471SEric Van Hensbergen 23460e78d2cSAbhishek Kulkarni /** 23560e78d2cSAbhishek Kulkarni * v9fs_alloc_inode - helper function to allocate an inode 23660e78d2cSAbhishek Kulkarni * 23760e78d2cSAbhishek Kulkarni */ 23860e78d2cSAbhishek Kulkarni struct inode *v9fs_alloc_inode(struct super_block *sb) 23960e78d2cSAbhishek Kulkarni { 240a78ce05dSAneesh Kumar K.V struct v9fs_inode *v9inode; 241a78ce05dSAneesh Kumar K.V v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache, 24260e78d2cSAbhishek Kulkarni GFP_KERNEL); 243a78ce05dSAneesh Kumar K.V if (!v9inode) 24460e78d2cSAbhishek Kulkarni return NULL; 245a78ce05dSAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 246a78ce05dSAneesh Kumar K.V v9inode->fscache = NULL; 247a78ce05dSAneesh Kumar K.V spin_lock_init(&v9inode->fscache_lock); 248a78ce05dSAneesh Kumar K.V #endif 2496b39f6d2SAneesh Kumar K.V v9inode->writeback_fid = NULL; 250b3cbea03SAneesh Kumar K.V v9inode->cache_validity = 0; 2515a7e0a8cSAneesh Kumar K.V mutex_init(&v9inode->v_mutex); 252a78ce05dSAneesh Kumar K.V return &v9inode->vfs_inode; 25360e78d2cSAbhishek Kulkarni } 25460e78d2cSAbhishek Kulkarni 25560e78d2cSAbhishek Kulkarni /** 25660e78d2cSAbhishek Kulkarni * v9fs_destroy_inode - destroy an inode 25760e78d2cSAbhishek Kulkarni * 25860e78d2cSAbhishek Kulkarni */ 25960e78d2cSAbhishek Kulkarni 260fa0d7e3dSNick Piggin static void v9fs_i_callback(struct rcu_head *head) 261fa0d7e3dSNick Piggin { 262fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 263a78ce05dSAneesh Kumar K.V kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 264fa0d7e3dSNick Piggin } 265fa0d7e3dSNick Piggin 26660e78d2cSAbhishek Kulkarni void v9fs_destroy_inode(struct inode *inode) 26760e78d2cSAbhishek Kulkarni { 268fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, v9fs_i_callback); 26960e78d2cSAbhishek Kulkarni } 27060e78d2cSAbhishek Kulkarni 2715ffc0cb3SAneesh Kumar K.V int v9fs_init_inode(struct v9fs_session_info *v9ses, 2723eda0de6SAl Viro struct inode *inode, umode_t mode, dev_t rdev) 2732bad8471SEric Van Hensbergen { 2745ffc0cb3SAneesh Kumar K.V int err = 0; 2752bb54115SAbhishek Kulkarni 276217f206dSDmitry Monakhov inode_init_owner(inode, NULL, mode); 2772bad8471SEric Van Hensbergen inode->i_blocks = 0; 27845089142SAneesh Kumar K.V inode->i_rdev = rdev; 2792bad8471SEric Van Hensbergen inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 280147b31cfSEric Van Hensbergen inode->i_mapping->a_ops = &v9fs_addr_operations; 2812bad8471SEric Van Hensbergen 2822bad8471SEric Van Hensbergen switch (mode & S_IFMT) { 2832bad8471SEric Van Hensbergen case S_IFIFO: 2842bad8471SEric Van Hensbergen case S_IFBLK: 2852bad8471SEric Van Hensbergen case S_IFCHR: 2862bad8471SEric Van Hensbergen case S_IFSOCK: 2874b43516aSM. Mohan Kumar if (v9fs_proto_dotl(v9ses)) { 2884b43516aSM. Mohan Kumar inode->i_op = &v9fs_file_inode_operations_dotl; 2894b43516aSM. Mohan Kumar } else if (v9fs_proto_dotu(v9ses)) { 2904b43516aSM. Mohan Kumar inode->i_op = &v9fs_file_inode_operations; 2914b43516aSM. Mohan Kumar } else { 2925d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, 293bd238fb4SLatchesar Ionkov "special files without extended mode\n"); 2942bb54115SAbhishek Kulkarni err = -EINVAL; 2952bb54115SAbhishek Kulkarni goto error; 296b501611aSEric Van Hensbergen } 2972bb54115SAbhishek Kulkarni init_special_inode(inode, inode->i_mode, inode->i_rdev); 2985d58bec5SEric Van Hensbergen break; 2992bad8471SEric Van Hensbergen case S_IFREG: 3009b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 3019b6533c9SSripathi Kodi inode->i_op = &v9fs_file_inode_operations_dotl; 30229236f4eSAneesh Kumar K.V if (v9ses->cache) 30329236f4eSAneesh Kumar K.V inode->i_fop = 30429236f4eSAneesh Kumar K.V &v9fs_cached_file_operations_dotl; 30529236f4eSAneesh Kumar K.V else 3069b6533c9SSripathi Kodi inode->i_fop = &v9fs_file_operations_dotl; 3079b6533c9SSripathi Kodi } else { 3082bad8471SEric Van Hensbergen inode->i_op = &v9fs_file_inode_operations; 30929236f4eSAneesh Kumar K.V if (v9ses->cache) 31029236f4eSAneesh Kumar K.V inode->i_fop = &v9fs_cached_file_operations; 31129236f4eSAneesh Kumar K.V else 3122bad8471SEric Van Hensbergen inode->i_fop = &v9fs_file_operations; 3139b6533c9SSripathi Kodi } 3149b6533c9SSripathi Kodi 3152bad8471SEric Van Hensbergen break; 316b501611aSEric Van Hensbergen case S_IFLNK: 3179b6533c9SSripathi Kodi if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 3185d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, 3195d385153SJoe Perches "extended modes used with legacy protocol\n"); 3202bb54115SAbhishek Kulkarni err = -EINVAL; 3212bb54115SAbhishek Kulkarni goto error; 322b501611aSEric Van Hensbergen } 3239b6533c9SSripathi Kodi 3249b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3259b6533c9SSripathi Kodi inode->i_op = &v9fs_symlink_inode_operations_dotl; 3269b6533c9SSripathi Kodi else 327b501611aSEric Van Hensbergen inode->i_op = &v9fs_symlink_inode_operations; 3289b6533c9SSripathi Kodi 329b501611aSEric Van Hensbergen break; 3302bad8471SEric Van Hensbergen case S_IFDIR: 331d8c76e6fSDave Hansen inc_nlink(inode); 3329b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3339b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotl; 3349b6533c9SSripathi Kodi else if (v9fs_proto_dotu(v9ses)) 3359b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotu; 336b501611aSEric Van Hensbergen else 3372bad8471SEric Van Hensbergen inode->i_op = &v9fs_dir_inode_operations; 3389b6533c9SSripathi Kodi 3399b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3409b6533c9SSripathi Kodi inode->i_fop = &v9fs_dir_operations_dotl; 3419b6533c9SSripathi Kodi else 3422bad8471SEric Van Hensbergen inode->i_fop = &v9fs_dir_operations; 3439b6533c9SSripathi Kodi 3442bad8471SEric Van Hensbergen break; 3452bad8471SEric Van Hensbergen default: 346609eac1cSLinus Torvalds p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 3472bad8471SEric Van Hensbergen mode, mode & S_IFMT); 3482bb54115SAbhishek Kulkarni err = -EINVAL; 3492bb54115SAbhishek Kulkarni goto error; 3502bad8471SEric Van Hensbergen } 3512bb54115SAbhishek Kulkarni error: 3525ffc0cb3SAneesh Kumar K.V return err; 3535ffc0cb3SAneesh Kumar K.V 3545ffc0cb3SAneesh Kumar K.V } 3555ffc0cb3SAneesh Kumar K.V 3565ffc0cb3SAneesh Kumar K.V /** 3575ffc0cb3SAneesh Kumar K.V * v9fs_get_inode - helper function to setup an inode 3585ffc0cb3SAneesh Kumar K.V * @sb: superblock 3595ffc0cb3SAneesh Kumar K.V * @mode: mode to setup inode with 3605ffc0cb3SAneesh Kumar K.V * 3615ffc0cb3SAneesh Kumar K.V */ 3625ffc0cb3SAneesh Kumar K.V 3633eda0de6SAl Viro struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) 3645ffc0cb3SAneesh Kumar K.V { 3655ffc0cb3SAneesh Kumar K.V int err; 3665ffc0cb3SAneesh Kumar K.V struct inode *inode; 3675ffc0cb3SAneesh Kumar K.V struct v9fs_session_info *v9ses = sb->s_fs_info; 3685ffc0cb3SAneesh Kumar K.V 369609eac1cSLinus Torvalds p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); 3705ffc0cb3SAneesh Kumar K.V 3715ffc0cb3SAneesh Kumar K.V inode = new_inode(sb); 3725ffc0cb3SAneesh Kumar K.V if (!inode) { 3735d385153SJoe Perches pr_warn("%s (%d): Problem allocating inode\n", 3745d385153SJoe Perches __func__, task_pid_nr(current)); 3755ffc0cb3SAneesh Kumar K.V return ERR_PTR(-ENOMEM); 3765ffc0cb3SAneesh Kumar K.V } 37745089142SAneesh Kumar K.V err = v9fs_init_inode(v9ses, inode, mode, rdev); 3785ffc0cb3SAneesh Kumar K.V if (err) { 3792bb54115SAbhishek Kulkarni iput(inode); 3802bb54115SAbhishek Kulkarni return ERR_PTR(err); 3812bad8471SEric Van Hensbergen } 3825ffc0cb3SAneesh Kumar K.V return inode; 3835ffc0cb3SAneesh Kumar K.V } 3842bad8471SEric Van Hensbergen 385bd238fb4SLatchesar Ionkov /* 3866a3124a3SLatchesar Ionkov static struct v9fs_fid* 3876a3124a3SLatchesar Ionkov v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 3886a3124a3SLatchesar Ionkov { 3896a3124a3SLatchesar Ionkov int err; 390736c4b85SMika Kukkonen int nfid; 3916a3124a3SLatchesar Ionkov struct v9fs_fid *ret; 3926a3124a3SLatchesar Ionkov struct v9fs_fcall *fcall; 3930b8dd177SLatchesar Ionkov 3946a3124a3SLatchesar Ionkov nfid = v9fs_get_idpool(&v9ses->fidpool); 3956a3124a3SLatchesar Ionkov if (nfid < 0) { 3960b8dd177SLatchesar Ionkov eprintk(KERN_WARNING, "no free fids available\n"); 397731805b4SLatchesar Ionkov return ERR_PTR(-ENOSPC); 3980b8dd177SLatchesar Ionkov } 3990b8dd177SLatchesar Ionkov 4006a3124a3SLatchesar Ionkov err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 4016a3124a3SLatchesar Ionkov &fcall); 4026a3124a3SLatchesar Ionkov 4036a3124a3SLatchesar Ionkov if (err < 0) { 40441e5a6acSLatchesar Ionkov if (fcall && fcall->id == RWALK) 40541e5a6acSLatchesar Ionkov goto clunk_fid; 40641e5a6acSLatchesar Ionkov 4076a3124a3SLatchesar Ionkov PRINT_FCALL_ERROR("walk error", fcall); 4086a3124a3SLatchesar Ionkov v9fs_put_idpool(nfid, &v9ses->fidpool); 4096a3124a3SLatchesar Ionkov goto error; 4100b8dd177SLatchesar Ionkov } 4116a3124a3SLatchesar Ionkov 4123cf6429aSLatchesar Ionkov kfree(fcall); 4133cf6429aSLatchesar Ionkov fcall = NULL; 4146a3124a3SLatchesar Ionkov ret = v9fs_fid_create(v9ses, nfid); 4156a3124a3SLatchesar Ionkov if (!ret) { 4166a3124a3SLatchesar Ionkov err = -ENOMEM; 4176a3124a3SLatchesar Ionkov goto clunk_fid; 4180b8dd177SLatchesar Ionkov } 4192bad8471SEric Van Hensbergen 4206a3124a3SLatchesar Ionkov err = v9fs_fid_insert(ret, dentry); 4216a3124a3SLatchesar Ionkov if (err < 0) { 4226a3124a3SLatchesar Ionkov v9fs_fid_destroy(ret); 4236a3124a3SLatchesar Ionkov goto clunk_fid; 4246a3124a3SLatchesar Ionkov } 4252bad8471SEric Van Hensbergen 4266a3124a3SLatchesar Ionkov return ret; 4276a3124a3SLatchesar Ionkov 4286a3124a3SLatchesar Ionkov clunk_fid: 4296a3124a3SLatchesar Ionkov v9fs_t_clunk(v9ses, nfid); 4306a3124a3SLatchesar Ionkov 4316a3124a3SLatchesar Ionkov error: 4326a3124a3SLatchesar Ionkov kfree(fcall); 4336a3124a3SLatchesar Ionkov return ERR_PTR(err); 4346a3124a3SLatchesar Ionkov } 435bd238fb4SLatchesar Ionkov */ 4366a3124a3SLatchesar Ionkov 43760e78d2cSAbhishek Kulkarni 43860e78d2cSAbhishek Kulkarni /** 43960e78d2cSAbhishek Kulkarni * v9fs_clear_inode - release an inode 44060e78d2cSAbhishek Kulkarni * @inode: inode to release 44160e78d2cSAbhishek Kulkarni * 44260e78d2cSAbhishek Kulkarni */ 443b57922d9SAl Viro void v9fs_evict_inode(struct inode *inode) 44460e78d2cSAbhishek Kulkarni { 4456b39f6d2SAneesh Kumar K.V struct v9fs_inode *v9inode = V9FS_I(inode); 4466b39f6d2SAneesh Kumar K.V 447b57922d9SAl Viro truncate_inode_pages(inode->i_mapping, 0); 448dbd5768fSJan Kara clear_inode(inode); 44960e78d2cSAbhishek Kulkarni filemap_fdatawrite(inode->i_mapping); 45060e78d2cSAbhishek Kulkarni 45160e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 45260e78d2cSAbhishek Kulkarni v9fs_cache_inode_put_cookie(inode); 45360e78d2cSAbhishek Kulkarni #endif 4546b39f6d2SAneesh Kumar K.V /* clunk the fid stashed in writeback_fid */ 4556b39f6d2SAneesh Kumar K.V if (v9inode->writeback_fid) { 4566b39f6d2SAneesh Kumar K.V p9_client_clunk(v9inode->writeback_fid); 4576b39f6d2SAneesh Kumar K.V v9inode->writeback_fid = NULL; 4583cf387d7SAneesh Kumar K.V } 45960e78d2cSAbhishek Kulkarni } 46060e78d2cSAbhishek Kulkarni 461fd2421f5SAneesh Kumar K.V static int v9fs_test_inode(struct inode *inode, void *data) 462fd2421f5SAneesh Kumar K.V { 463fd2421f5SAneesh Kumar K.V int umode; 46445089142SAneesh Kumar K.V dev_t rdev; 465fd2421f5SAneesh Kumar K.V struct v9fs_inode *v9inode = V9FS_I(inode); 466fd2421f5SAneesh Kumar K.V struct p9_wstat *st = (struct p9_wstat *)data; 467fd2421f5SAneesh Kumar K.V struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 468fd2421f5SAneesh Kumar K.V 46945089142SAneesh Kumar K.V umode = p9mode2unixmode(v9ses, st, &rdev); 470fd2421f5SAneesh Kumar K.V /* don't match inode of different type */ 471fd2421f5SAneesh Kumar K.V if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 472fd2421f5SAneesh Kumar K.V return 0; 473fd2421f5SAneesh Kumar K.V 474fd2421f5SAneesh Kumar K.V /* compare qid details */ 475fd2421f5SAneesh Kumar K.V if (memcmp(&v9inode->qid.version, 476fd2421f5SAneesh Kumar K.V &st->qid.version, sizeof(v9inode->qid.version))) 477fd2421f5SAneesh Kumar K.V return 0; 478fd2421f5SAneesh Kumar K.V 479fd2421f5SAneesh Kumar K.V if (v9inode->qid.type != st->qid.type) 480fd2421f5SAneesh Kumar K.V return 0; 481fd2421f5SAneesh Kumar K.V return 1; 482fd2421f5SAneesh Kumar K.V } 483fd2421f5SAneesh Kumar K.V 484ed80fcfaSAneesh Kumar K.V static int v9fs_test_new_inode(struct inode *inode, void *data) 485ed80fcfaSAneesh Kumar K.V { 486ed80fcfaSAneesh Kumar K.V return 0; 487ed80fcfaSAneesh Kumar K.V } 488ed80fcfaSAneesh Kumar K.V 489fd2421f5SAneesh Kumar K.V static int v9fs_set_inode(struct inode *inode, void *data) 490fd2421f5SAneesh Kumar K.V { 491fd2421f5SAneesh Kumar K.V struct v9fs_inode *v9inode = V9FS_I(inode); 492fd2421f5SAneesh Kumar K.V struct p9_wstat *st = (struct p9_wstat *)data; 493fd2421f5SAneesh Kumar K.V 494fd2421f5SAneesh Kumar K.V memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 495fd2421f5SAneesh Kumar K.V return 0; 496fd2421f5SAneesh Kumar K.V } 497fd2421f5SAneesh Kumar K.V 4985ffc0cb3SAneesh Kumar K.V static struct inode *v9fs_qid_iget(struct super_block *sb, 4995ffc0cb3SAneesh Kumar K.V struct p9_qid *qid, 500ed80fcfaSAneesh Kumar K.V struct p9_wstat *st, 501ed80fcfaSAneesh Kumar K.V int new) 5025ffc0cb3SAneesh Kumar K.V { 50345089142SAneesh Kumar K.V dev_t rdev; 5043eda0de6SAl Viro int retval; 5053eda0de6SAl Viro umode_t umode; 5065ffc0cb3SAneesh Kumar K.V unsigned long i_ino; 5075ffc0cb3SAneesh Kumar K.V struct inode *inode; 5085ffc0cb3SAneesh Kumar K.V struct v9fs_session_info *v9ses = sb->s_fs_info; 509ed80fcfaSAneesh Kumar K.V int (*test)(struct inode *, void *); 510ed80fcfaSAneesh Kumar K.V 511ed80fcfaSAneesh Kumar K.V if (new) 512ed80fcfaSAneesh Kumar K.V test = v9fs_test_new_inode; 513ed80fcfaSAneesh Kumar K.V else 514ed80fcfaSAneesh Kumar K.V test = v9fs_test_inode; 5155ffc0cb3SAneesh Kumar K.V 5165ffc0cb3SAneesh Kumar K.V i_ino = v9fs_qid2ino(qid); 517ed80fcfaSAneesh Kumar K.V inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 5185ffc0cb3SAneesh Kumar K.V if (!inode) 5195ffc0cb3SAneesh Kumar K.V return ERR_PTR(-ENOMEM); 5205ffc0cb3SAneesh Kumar K.V if (!(inode->i_state & I_NEW)) 5215ffc0cb3SAneesh Kumar K.V return inode; 5225ffc0cb3SAneesh Kumar K.V /* 5235ffc0cb3SAneesh Kumar K.V * initialize the inode with the stat info 5245ffc0cb3SAneesh Kumar K.V * FIXME!! we may need support for stale inodes 5255ffc0cb3SAneesh Kumar K.V * later. 5265ffc0cb3SAneesh Kumar K.V */ 527fd2421f5SAneesh Kumar K.V inode->i_ino = i_ino; 52845089142SAneesh Kumar K.V umode = p9mode2unixmode(v9ses, st, &rdev); 52945089142SAneesh Kumar K.V retval = v9fs_init_inode(v9ses, inode, umode, rdev); 5305ffc0cb3SAneesh Kumar K.V if (retval) 5315ffc0cb3SAneesh Kumar K.V goto error; 5325ffc0cb3SAneesh Kumar K.V 5335ffc0cb3SAneesh Kumar K.V v9fs_stat2inode(st, inode, sb); 5345ffc0cb3SAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 5355ffc0cb3SAneesh Kumar K.V v9fs_cache_inode_get_cookie(inode); 5365ffc0cb3SAneesh Kumar K.V #endif 5375ffc0cb3SAneesh Kumar K.V unlock_new_inode(inode); 5385ffc0cb3SAneesh Kumar K.V return inode; 5395ffc0cb3SAneesh Kumar K.V error: 5405ffc0cb3SAneesh Kumar K.V unlock_new_inode(inode); 5415ffc0cb3SAneesh Kumar K.V iput(inode); 5425ffc0cb3SAneesh Kumar K.V return ERR_PTR(retval); 5435ffc0cb3SAneesh Kumar K.V 5445ffc0cb3SAneesh Kumar K.V } 5455ffc0cb3SAneesh Kumar K.V 54653c06f4eSAneesh Kumar K.V struct inode * 547a78ce05dSAneesh Kumar K.V v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 548ed80fcfaSAneesh Kumar K.V struct super_block *sb, int new) 5496a3124a3SLatchesar Ionkov { 55051a87c55SEric Van Hensbergen struct p9_wstat *st; 5515ffc0cb3SAneesh Kumar K.V struct inode *inode = NULL; 5526a3124a3SLatchesar Ionkov 553bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 55402bc3567SAbhishek Kulkarni if (IS_ERR(st)) 55502bc3567SAbhishek Kulkarni return ERR_CAST(st); 5562bad8471SEric Van Hensbergen 557ed80fcfaSAneesh Kumar K.V inode = v9fs_qid_iget(sb, &st->qid, st, new); 55802bc3567SAbhishek Kulkarni p9stat_free(st); 559bd238fb4SLatchesar Ionkov kfree(st); 5605ffc0cb3SAneesh Kumar K.V return inode; 5612bad8471SEric Van Hensbergen } 5622bad8471SEric Van Hensbergen 5632bad8471SEric Van Hensbergen /** 564f88657ceSAneesh Kumar K.V * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 565f88657ceSAneesh Kumar K.V * plan 9 AT flag. 566f88657ceSAneesh Kumar K.V * @flags: flags to convert 567f88657ceSAneesh Kumar K.V */ 568f88657ceSAneesh Kumar K.V static int v9fs_at_to_dotl_flags(int flags) 569f88657ceSAneesh Kumar K.V { 570f88657ceSAneesh Kumar K.V int rflags = 0; 571f88657ceSAneesh Kumar K.V if (flags & AT_REMOVEDIR) 572f88657ceSAneesh Kumar K.V rflags |= P9_DOTL_AT_REMOVEDIR; 573f88657ceSAneesh Kumar K.V return rflags; 574f88657ceSAneesh Kumar K.V } 575f88657ceSAneesh Kumar K.V 576f88657ceSAneesh Kumar K.V /** 5772bad8471SEric Van Hensbergen * v9fs_remove - helper function to remove files and directories 57873c592b9SEric Van Hensbergen * @dir: directory inode that is being deleted 57948e370ffSAneesh Kumar K.V * @dentry: dentry that is being deleted 58073c592b9SEric Van Hensbergen * @rmdir: removing a directory 5812bad8471SEric Van Hensbergen * 5822bad8471SEric Van Hensbergen */ 5832bad8471SEric Van Hensbergen 58448e370ffSAneesh Kumar K.V static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 5852bad8471SEric Van Hensbergen { 58648e370ffSAneesh Kumar K.V struct inode *inode; 58748e370ffSAneesh Kumar K.V int retval = -EOPNOTSUPP; 58848e370ffSAneesh Kumar K.V struct p9_fid *v9fid, *dfid; 58948e370ffSAneesh Kumar K.V struct v9fs_session_info *v9ses; 5902bad8471SEric Van Hensbergen 5915d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 59248e370ffSAneesh Kumar K.V dir, dentry, flags); 5932bad8471SEric Van Hensbergen 59448e370ffSAneesh Kumar K.V v9ses = v9fs_inode2v9ses(dir); 59548e370ffSAneesh Kumar K.V inode = dentry->d_inode; 59648e370ffSAneesh Kumar K.V dfid = v9fs_fid_lookup(dentry->d_parent); 59748e370ffSAneesh Kumar K.V if (IS_ERR(dfid)) { 59848e370ffSAneesh Kumar K.V retval = PTR_ERR(dfid); 5995d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 60048e370ffSAneesh Kumar K.V return retval; 60148e370ffSAneesh Kumar K.V } 60248e370ffSAneesh Kumar K.V if (v9fs_proto_dotl(v9ses)) 603f88657ceSAneesh Kumar K.V retval = p9_client_unlinkat(dfid, dentry->d_name.name, 604f88657ceSAneesh Kumar K.V v9fs_at_to_dotl_flags(flags)); 60548e370ffSAneesh Kumar K.V if (retval == -EOPNOTSUPP) { 60648e370ffSAneesh Kumar K.V /* Try the one based on path */ 60748e370ffSAneesh Kumar K.V v9fid = v9fs_fid_clone(dentry); 608da977b2cSEric Van Hensbergen if (IS_ERR(v9fid)) 609da977b2cSEric Van Hensbergen return PTR_ERR(v9fid); 610d994f405SAneesh Kumar K.V retval = p9_client_remove(v9fid); 61148e370ffSAneesh Kumar K.V } 612b271ec47SAneesh Kumar K.V if (!retval) { 613b271ec47SAneesh Kumar K.V /* 614b271ec47SAneesh Kumar K.V * directories on unlink should have zero 615b271ec47SAneesh Kumar K.V * link count 616b271ec47SAneesh Kumar K.V */ 61748e370ffSAneesh Kumar K.V if (flags & AT_REMOVEDIR) { 61848e370ffSAneesh Kumar K.V clear_nlink(inode); 619b271ec47SAneesh Kumar K.V drop_nlink(dir); 620b271ec47SAneesh Kumar K.V } else 62148e370ffSAneesh Kumar K.V drop_nlink(inode); 622d28c61f0SAneesh Kumar K.V 62348e370ffSAneesh Kumar K.V v9fs_invalidate_inode_attr(inode); 624d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(dir); 625b271ec47SAneesh Kumar K.V } 626d994f405SAneesh Kumar K.V return retval; 6272bad8471SEric Van Hensbergen } 6282bad8471SEric Van Hensbergen 629bd238fb4SLatchesar Ionkov /** 630bd238fb4SLatchesar Ionkov * v9fs_create - Create a file 631ee443996SEric Van Hensbergen * @v9ses: session information 632ee443996SEric Van Hensbergen * @dir: directory that dentry is being created in 633bd238fb4SLatchesar Ionkov * @dentry: dentry that is being created 6340e15597eSAbhishek Kulkarni * @extension: 9p2000.u extension string to support devices, etc. 635bd238fb4SLatchesar Ionkov * @perm: create permissions 636bd238fb4SLatchesar Ionkov * @mode: open mode 637bd238fb4SLatchesar Ionkov * 638bd238fb4SLatchesar Ionkov */ 639bd238fb4SLatchesar Ionkov static struct p9_fid * 640bd238fb4SLatchesar Ionkov v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 641bd238fb4SLatchesar Ionkov struct dentry *dentry, char *extension, u32 perm, u8 mode) 642bd238fb4SLatchesar Ionkov { 643bd238fb4SLatchesar Ionkov int err; 644bd238fb4SLatchesar Ionkov char *name; 645bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *ofid, *fid; 646bd238fb4SLatchesar Ionkov struct inode *inode; 647bd238fb4SLatchesar Ionkov 6485d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 64951a87c55SEric Van Hensbergen 650bd238fb4SLatchesar Ionkov err = 0; 651bd238fb4SLatchesar Ionkov ofid = NULL; 652bd238fb4SLatchesar Ionkov fid = NULL; 653bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 6546d27e64dSVenkateswararao Jujjuri dfid = v9fs_fid_lookup(dentry->d_parent); 655bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) { 656bd238fb4SLatchesar Ionkov err = PTR_ERR(dfid); 6575d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 6586d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 659bd238fb4SLatchesar Ionkov } 660bd238fb4SLatchesar Ionkov 661bd238fb4SLatchesar Ionkov /* clone a fid to use for creation */ 662bd238fb4SLatchesar Ionkov ofid = p9_client_walk(dfid, 0, NULL, 1); 663bd238fb4SLatchesar Ionkov if (IS_ERR(ofid)) { 664bd238fb4SLatchesar Ionkov err = PTR_ERR(ofid); 6655d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 6666d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 667bd238fb4SLatchesar Ionkov } 668bd238fb4SLatchesar Ionkov 669bd238fb4SLatchesar Ionkov err = p9_client_fcreate(ofid, name, perm, mode, extension); 67051a87c55SEric Van Hensbergen if (err < 0) { 6715d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 672bd238fb4SLatchesar Ionkov goto error; 67351a87c55SEric Van Hensbergen } 674bd238fb4SLatchesar Ionkov 675b6054793SAneesh Kumar K.V if (!(perm & P9_DMLINK)) { 676bd238fb4SLatchesar Ionkov /* now walk from the parent so we can get unopened fid */ 6776d27e64dSVenkateswararao Jujjuri fid = p9_client_walk(dfid, 1, &name, 1); 678bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 679bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 680b6054793SAneesh Kumar K.V p9_debug(P9_DEBUG_VFS, 681b6054793SAneesh Kumar K.V "p9_client_walk failed %d\n", err); 682bd238fb4SLatchesar Ionkov fid = NULL; 683bd238fb4SLatchesar Ionkov goto error; 6846d27e64dSVenkateswararao Jujjuri } 685b6054793SAneesh Kumar K.V /* 686b6054793SAneesh Kumar K.V * instantiate inode and assign the unopened fid to the dentry 687b6054793SAneesh Kumar K.V */ 688ed80fcfaSAneesh Kumar K.V inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 689bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 690bd238fb4SLatchesar Ionkov err = PTR_ERR(inode); 691b6054793SAneesh Kumar K.V p9_debug(P9_DEBUG_VFS, 692b6054793SAneesh Kumar K.V "inode creation failed %d\n", err); 693bd238fb4SLatchesar Ionkov goto error; 694bd238fb4SLatchesar Ionkov } 6952ea03e1dSAl Viro v9fs_fid_add(dentry, fid); 6965441ae5eSAneesh Kumar K.V d_instantiate(dentry, inode); 697b6054793SAneesh Kumar K.V } 698bd238fb4SLatchesar Ionkov return ofid; 699bd238fb4SLatchesar Ionkov error: 700bd238fb4SLatchesar Ionkov if (ofid) 701bd238fb4SLatchesar Ionkov p9_client_clunk(ofid); 702bd238fb4SLatchesar Ionkov 703bd238fb4SLatchesar Ionkov if (fid) 704bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 705bd238fb4SLatchesar Ionkov 706bd238fb4SLatchesar Ionkov return ERR_PTR(err); 707bd238fb4SLatchesar Ionkov } 708bd238fb4SLatchesar Ionkov 7092bad8471SEric Van Hensbergen /** 710e43ae79cSMiklos Szeredi * v9fs_vfs_create - VFS hook to create a regular file 711e43ae79cSMiklos Szeredi * 712e43ae79cSMiklos Szeredi * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 713e43ae79cSMiklos Szeredi * for mknod(2). 714e43ae79cSMiklos Szeredi * 715ee443996SEric Van Hensbergen * @dir: directory inode that is being created 7162bad8471SEric Van Hensbergen * @dentry: dentry that is being deleted 7176a3124a3SLatchesar Ionkov * @mode: create permissions 7182bad8471SEric Van Hensbergen * 7192bad8471SEric Van Hensbergen */ 7202bad8471SEric Van Hensbergen 7212bad8471SEric Van Hensbergen static int 7224acdaf27SAl Viro v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 723ebfc3b49SAl Viro bool excl) 7242bad8471SEric Van Hensbergen { 725e43ae79cSMiklos Szeredi struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 726e43ae79cSMiklos Szeredi u32 perm = unixmode2p9mode(v9ses, mode); 727e43ae79cSMiklos Szeredi struct p9_fid *fid; 7286a3124a3SLatchesar Ionkov 729e43ae79cSMiklos Szeredi /* P9_OEXCL? */ 730e43ae79cSMiklos Szeredi fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 731e43ae79cSMiklos Szeredi if (IS_ERR(fid)) 732e43ae79cSMiklos Szeredi return PTR_ERR(fid); 7336a3124a3SLatchesar Ionkov 734d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(dir); 735bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 7366a3124a3SLatchesar Ionkov 7376a3124a3SLatchesar Ionkov return 0; 7382bad8471SEric Van Hensbergen } 7392bad8471SEric Van Hensbergen 7402bad8471SEric Van Hensbergen /** 7412bad8471SEric Van Hensbergen * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 742ee443996SEric Van Hensbergen * @dir: inode that is being unlinked 7432bad8471SEric Van Hensbergen * @dentry: dentry that is being unlinked 7442bad8471SEric Van Hensbergen * @mode: mode for new directory 7452bad8471SEric Van Hensbergen * 7462bad8471SEric Van Hensbergen */ 7472bad8471SEric Van Hensbergen 74818bb1db3SAl Viro static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 7492bad8471SEric Van Hensbergen { 7506a3124a3SLatchesar Ionkov int err; 751bd238fb4SLatchesar Ionkov u32 perm; 752bd238fb4SLatchesar Ionkov struct p9_fid *fid; 753d28c61f0SAneesh Kumar K.V struct v9fs_session_info *v9ses; 7546a3124a3SLatchesar Ionkov 7555d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 756bd238fb4SLatchesar Ionkov err = 0; 7576a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 7586a3124a3SLatchesar Ionkov perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 759bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 760bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 761bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 762bd238fb4SLatchesar Ionkov fid = NULL; 763d28c61f0SAneesh Kumar K.V } else { 764b271ec47SAneesh Kumar K.V inc_nlink(dir); 765d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(dir); 766d28c61f0SAneesh Kumar K.V } 7676a3124a3SLatchesar Ionkov 768bd238fb4SLatchesar Ionkov if (fid) 769bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 7706a3124a3SLatchesar Ionkov 7716a3124a3SLatchesar Ionkov return err; 7722bad8471SEric Van Hensbergen } 7732bad8471SEric Van Hensbergen 7742bad8471SEric Van Hensbergen /** 7752bad8471SEric Van Hensbergen * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 7762bad8471SEric Van Hensbergen * @dir: inode that is being walked from 7772bad8471SEric Van Hensbergen * @dentry: dentry that is being walked to? 7782bad8471SEric Van Hensbergen * @nameidata: path data 7792bad8471SEric Van Hensbergen * 7802bad8471SEric Van Hensbergen */ 7812bad8471SEric Van Hensbergen 78253c06f4eSAneesh Kumar K.V struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 78300cd8dd3SAl Viro unsigned int flags) 7842bad8471SEric Van Hensbergen { 78573f50717SAneesh Kumar K.V struct dentry *res; 7862bad8471SEric Van Hensbergen struct super_block *sb; 7872bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses; 788bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *fid; 7892bad8471SEric Van Hensbergen struct inode *inode; 790bd238fb4SLatchesar Ionkov char *name; 7912bad8471SEric Van Hensbergen 79200cd8dd3SAl Viro p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p flags: %x\n", 79300cd8dd3SAl Viro dir, dentry->d_name.name, dentry, flags); 7942bad8471SEric Van Hensbergen 79511e9b49bSSripathi Kodi if (dentry->d_name.len > NAME_MAX) 79611e9b49bSSripathi Kodi return ERR_PTR(-ENAMETOOLONG); 79711e9b49bSSripathi Kodi 7982bad8471SEric Van Hensbergen sb = dir->i_sb; 7992bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(dir); 800a534c8d1SAneesh Kumar K.V /* We can walk d_parent because we hold the dir->i_mutex */ 801bd238fb4SLatchesar Ionkov dfid = v9fs_fid_lookup(dentry->d_parent); 802bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) 803e231c2eeSDavid Howells return ERR_CAST(dfid); 8042bad8471SEric Van Hensbergen 805bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 806bd238fb4SLatchesar Ionkov fid = p9_client_walk(dfid, 1, &name, 1); 807bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 8087b5be621SAl Viro if (fid == ERR_PTR(-ENOENT)) { 8097b5be621SAl Viro d_add(dentry, NULL); 8107b5be621SAl Viro return NULL; 8112bad8471SEric Van Hensbergen } 8127b5be621SAl Viro return ERR_CAST(fid); 8132bad8471SEric Van Hensbergen } 81473f50717SAneesh Kumar K.V /* 81573f50717SAneesh Kumar K.V * Make sure we don't use a wrong inode due to parallel 81673f50717SAneesh Kumar K.V * unlink. For cached mode create calls request for new 81773f50717SAneesh Kumar K.V * inode. But with cache disabled, lookup should do this. 81873f50717SAneesh Kumar K.V */ 81973f50717SAneesh Kumar K.V if (v9ses->cache) 820a78ce05dSAneesh Kumar K.V inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 82173f50717SAneesh Kumar K.V else 82273f50717SAneesh Kumar K.V inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 823bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 8247b5be621SAl Viro p9_client_clunk(fid); 8257b5be621SAl Viro return ERR_CAST(inode); 8262bad8471SEric Van Hensbergen } 82773f50717SAneesh Kumar K.V /* 82873f50717SAneesh Kumar K.V * If we had a rename on the server and a parallel lookup 82973f50717SAneesh Kumar K.V * for the new name, then make sure we instantiate with 83073f50717SAneesh Kumar K.V * the new name. ie look up for a/b, while on server somebody 83173f50717SAneesh Kumar K.V * moved b under k and client parallely did a lookup for 83273f50717SAneesh Kumar K.V * k/b. 83373f50717SAneesh Kumar K.V */ 83473f50717SAneesh Kumar K.V res = d_materialise_unique(dentry, inode); 835a3b2157eSAl Viro if (!res) 836a3b2157eSAl Viro v9fs_fid_add(dentry, fid); 837a3b2157eSAl Viro else if (!IS_ERR(res)) 838a3b2157eSAl Viro v9fs_fid_add(res, fid); 839a3b2157eSAl Viro else 840bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 8417b5be621SAl Viro return res; 8422bad8471SEric Van Hensbergen } 8432bad8471SEric Van Hensbergen 844d9585277SAl Viro static int 845e43ae79cSMiklos Szeredi v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 84630d90494SAl Viro struct file *file, unsigned flags, umode_t mode, 84747237687SAl Viro int *opened) 848e43ae79cSMiklos Szeredi { 849e43ae79cSMiklos Szeredi int err; 850e43ae79cSMiklos Szeredi u32 perm; 851e43ae79cSMiklos Szeredi struct v9fs_inode *v9inode; 852e43ae79cSMiklos Szeredi struct v9fs_session_info *v9ses; 853e43ae79cSMiklos Szeredi struct p9_fid *fid, *inode_fid; 854e43ae79cSMiklos Szeredi struct dentry *res = NULL; 855e43ae79cSMiklos Szeredi 856e43ae79cSMiklos Szeredi if (d_unhashed(dentry)) { 85700cd8dd3SAl Viro res = v9fs_vfs_lookup(dir, dentry, 0); 858e43ae79cSMiklos Szeredi if (IS_ERR(res)) 859d9585277SAl Viro return PTR_ERR(res); 860e43ae79cSMiklos Szeredi 861e43ae79cSMiklos Szeredi if (res) 862e43ae79cSMiklos Szeredi dentry = res; 863e43ae79cSMiklos Szeredi } 864e43ae79cSMiklos Szeredi 865e43ae79cSMiklos Szeredi /* Only creates */ 866e45198a6SAl Viro if (!(flags & O_CREAT) || dentry->d_inode) 867e45198a6SAl Viro return finish_no_open(file, res); 868e43ae79cSMiklos Szeredi 869e43ae79cSMiklos Szeredi err = 0; 870e43ae79cSMiklos Szeredi fid = NULL; 871e43ae79cSMiklos Szeredi v9ses = v9fs_inode2v9ses(dir); 872e43ae79cSMiklos Szeredi perm = unixmode2p9mode(v9ses, mode); 873e43ae79cSMiklos Szeredi fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 874e43ae79cSMiklos Szeredi v9fs_uflags2omode(flags, 875e43ae79cSMiklos Szeredi v9fs_proto_dotu(v9ses))); 876e43ae79cSMiklos Szeredi if (IS_ERR(fid)) { 877e43ae79cSMiklos Szeredi err = PTR_ERR(fid); 878e43ae79cSMiklos Szeredi fid = NULL; 879e43ae79cSMiklos Szeredi goto error; 880e43ae79cSMiklos Szeredi } 881e43ae79cSMiklos Szeredi 882e43ae79cSMiklos Szeredi v9fs_invalidate_inode_attr(dir); 883e43ae79cSMiklos Szeredi v9inode = V9FS_I(dentry->d_inode); 884e43ae79cSMiklos Szeredi mutex_lock(&v9inode->v_mutex); 885e43ae79cSMiklos Szeredi if (v9ses->cache && !v9inode->writeback_fid && 886e43ae79cSMiklos Szeredi ((flags & O_ACCMODE) != O_RDONLY)) { 887e43ae79cSMiklos Szeredi /* 888e43ae79cSMiklos Szeredi * clone a fid and add it to writeback_fid 889e43ae79cSMiklos Szeredi * we do it during open time instead of 890e43ae79cSMiklos Szeredi * page dirty time via write_begin/page_mkwrite 891e43ae79cSMiklos Szeredi * because we want write after unlink usecase 892e43ae79cSMiklos Szeredi * to work. 893e43ae79cSMiklos Szeredi */ 894e43ae79cSMiklos Szeredi inode_fid = v9fs_writeback_fid(dentry); 895e43ae79cSMiklos Szeredi if (IS_ERR(inode_fid)) { 896e43ae79cSMiklos Szeredi err = PTR_ERR(inode_fid); 897e43ae79cSMiklos Szeredi mutex_unlock(&v9inode->v_mutex); 898e43ae79cSMiklos Szeredi goto error; 899e43ae79cSMiklos Szeredi } 900e43ae79cSMiklos Szeredi v9inode->writeback_fid = (void *) inode_fid; 901e43ae79cSMiklos Szeredi } 902e43ae79cSMiklos Szeredi mutex_unlock(&v9inode->v_mutex); 90330d90494SAl Viro err = finish_open(file, dentry, generic_file_open, opened); 90430d90494SAl Viro if (err) 905e43ae79cSMiklos Szeredi goto error; 906e43ae79cSMiklos Szeredi 90730d90494SAl Viro file->private_data = fid; 908e43ae79cSMiklos Szeredi #ifdef CONFIG_9P_FSCACHE 909e43ae79cSMiklos Szeredi if (v9ses->cache) 91030d90494SAl Viro v9fs_cache_inode_set_cookie(dentry->d_inode, file); 911e43ae79cSMiklos Szeredi #endif 912e43ae79cSMiklos Szeredi 91347237687SAl Viro *opened |= FILE_CREATED; 914e43ae79cSMiklos Szeredi out: 915e43ae79cSMiklos Szeredi dput(res); 916d9585277SAl Viro return err; 917e43ae79cSMiklos Szeredi 918e43ae79cSMiklos Szeredi error: 919e43ae79cSMiklos Szeredi if (fid) 920e43ae79cSMiklos Szeredi p9_client_clunk(fid); 921e43ae79cSMiklos Szeredi goto out; 922e43ae79cSMiklos Szeredi } 923e43ae79cSMiklos Szeredi 9242bad8471SEric Van Hensbergen /** 9252bad8471SEric Van Hensbergen * v9fs_vfs_unlink - VFS unlink hook to delete an inode 9262bad8471SEric Van Hensbergen * @i: inode that is being unlinked 92773c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 9282bad8471SEric Van Hensbergen * 9292bad8471SEric Van Hensbergen */ 9302bad8471SEric Van Hensbergen 93153c06f4eSAneesh Kumar K.V int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 9322bad8471SEric Van Hensbergen { 9332bad8471SEric Van Hensbergen return v9fs_remove(i, d, 0); 9342bad8471SEric Van Hensbergen } 9352bad8471SEric Van Hensbergen 9362bad8471SEric Van Hensbergen /** 9372bad8471SEric Van Hensbergen * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 9382bad8471SEric Van Hensbergen * @i: inode that is being unlinked 93973c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 9402bad8471SEric Van Hensbergen * 9412bad8471SEric Van Hensbergen */ 9422bad8471SEric Van Hensbergen 94353c06f4eSAneesh Kumar K.V int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 9442bad8471SEric Van Hensbergen { 94548e370ffSAneesh Kumar K.V return v9fs_remove(i, d, AT_REMOVEDIR); 9462bad8471SEric Van Hensbergen } 9472bad8471SEric Van Hensbergen 9482bad8471SEric Van Hensbergen /** 9492bad8471SEric Van Hensbergen * v9fs_vfs_rename - VFS hook to rename an inode 9502bad8471SEric Van Hensbergen * @old_dir: old dir inode 9512bad8471SEric Van Hensbergen * @old_dentry: old dentry 9522bad8471SEric Van Hensbergen * @new_dir: new dir inode 9532bad8471SEric Van Hensbergen * @new_dentry: new dentry 9542bad8471SEric Van Hensbergen * 9552bad8471SEric Van Hensbergen */ 9562bad8471SEric Van Hensbergen 95753c06f4eSAneesh Kumar K.V int 9582bad8471SEric Van Hensbergen v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 9592bad8471SEric Van Hensbergen struct inode *new_dir, struct dentry *new_dentry) 9602bad8471SEric Van Hensbergen { 961d28c61f0SAneesh Kumar K.V int retval; 962bd238fb4SLatchesar Ionkov struct inode *old_inode; 963b271ec47SAneesh Kumar K.V struct inode *new_inode; 964bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 965bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 966bd238fb4SLatchesar Ionkov struct p9_fid *olddirfid; 967bd238fb4SLatchesar Ionkov struct p9_fid *newdirfid; 968bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 9692bad8471SEric Van Hensbergen 9705d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "\n"); 971bd238fb4SLatchesar Ionkov retval = 0; 972bd238fb4SLatchesar Ionkov old_inode = old_dentry->d_inode; 973b271ec47SAneesh Kumar K.V new_inode = new_dentry->d_inode; 974bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(old_inode); 975bd238fb4SLatchesar Ionkov oldfid = v9fs_fid_lookup(old_dentry); 976da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 977da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 978da977b2cSEric Van Hensbergen 979da977b2cSEric Van Hensbergen olddirfid = v9fs_fid_clone(old_dentry->d_parent); 980da977b2cSEric Van Hensbergen if (IS_ERR(olddirfid)) { 981da977b2cSEric Van Hensbergen retval = PTR_ERR(olddirfid); 982bd238fb4SLatchesar Ionkov goto done; 983da977b2cSEric Van Hensbergen } 984da977b2cSEric Van Hensbergen 985da977b2cSEric Van Hensbergen newdirfid = v9fs_fid_clone(new_dentry->d_parent); 986da977b2cSEric Van Hensbergen if (IS_ERR(newdirfid)) { 987da977b2cSEric Van Hensbergen retval = PTR_ERR(newdirfid); 988bd238fb4SLatchesar Ionkov goto clunk_olddir; 9892bad8471SEric Van Hensbergen } 9902bad8471SEric Van Hensbergen 991a534c8d1SAneesh Kumar K.V down_write(&v9ses->rename_sem); 9924681dbdaSSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 9939e8fb38eSAneesh Kumar K.V retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 9949e8fb38eSAneesh Kumar K.V newdirfid, new_dentry->d_name.name); 9959e8fb38eSAneesh Kumar K.V if (retval == -EOPNOTSUPP) 9964681dbdaSSripathi Kodi retval = p9_client_rename(oldfid, newdirfid, 9979e8fb38eSAneesh Kumar K.V new_dentry->d_name.name); 9989e8fb38eSAneesh Kumar K.V if (retval != -EOPNOTSUPP) 9994681dbdaSSripathi Kodi goto clunk_newdir; 10004681dbdaSSripathi Kodi } 1001a534c8d1SAneesh Kumar K.V if (old_dentry->d_parent != new_dentry->d_parent) { 1002a534c8d1SAneesh Kumar K.V /* 1003a534c8d1SAneesh Kumar K.V * 9P .u can only handle file rename in the same directory 1004a534c8d1SAneesh Kumar K.V */ 10054681dbdaSSripathi Kodi 10065d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 1007621997cdSEric Van Hensbergen retval = -EXDEV; 1008bd238fb4SLatchesar Ionkov goto clunk_newdir; 10092bad8471SEric Van Hensbergen } 1010531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 1011ba17674fSLatchesar Ionkov wstat.muid = v9ses->uname; 1012531b1094SLatchesar Ionkov wstat.name = (char *) new_dentry->d_name.name; 1013bd238fb4SLatchesar Ionkov retval = p9_client_wstat(oldfid, &wstat); 10142bad8471SEric Van Hensbergen 1015bd238fb4SLatchesar Ionkov clunk_newdir: 1016b271ec47SAneesh Kumar K.V if (!retval) { 1017b271ec47SAneesh Kumar K.V if (new_inode) { 1018b271ec47SAneesh Kumar K.V if (S_ISDIR(new_inode->i_mode)) 1019b271ec47SAneesh Kumar K.V clear_nlink(new_inode); 1020b271ec47SAneesh Kumar K.V else 1021b271ec47SAneesh Kumar K.V drop_nlink(new_inode); 1022b271ec47SAneesh Kumar K.V } 1023b271ec47SAneesh Kumar K.V if (S_ISDIR(old_inode->i_mode)) { 1024b271ec47SAneesh Kumar K.V if (!new_inode) 1025b271ec47SAneesh Kumar K.V inc_nlink(new_dir); 1026b271ec47SAneesh Kumar K.V drop_nlink(old_dir); 1027b271ec47SAneesh Kumar K.V } 10283bc86de3SAneesh Kumar K.V v9fs_invalidate_inode_attr(old_inode); 1029d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(old_dir); 1030d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(new_dir); 10313bc86de3SAneesh Kumar K.V 1032a534c8d1SAneesh Kumar K.V /* successful rename */ 1033a534c8d1SAneesh Kumar K.V d_move(old_dentry, new_dentry); 1034b271ec47SAneesh Kumar K.V } 1035a534c8d1SAneesh Kumar K.V up_write(&v9ses->rename_sem); 103622150c4fSLatchesar Ionkov p9_client_clunk(newdirfid); 10372bad8471SEric Van Hensbergen 1038bd238fb4SLatchesar Ionkov clunk_olddir: 103922150c4fSLatchesar Ionkov p9_client_clunk(olddirfid); 10402bad8471SEric Van Hensbergen 1041bd238fb4SLatchesar Ionkov done: 10422bad8471SEric Van Hensbergen return retval; 10432bad8471SEric Van Hensbergen } 10442bad8471SEric Van Hensbergen 10452bad8471SEric Van Hensbergen /** 1046943ffb58SAdrian Bunk * v9fs_vfs_getattr - retrieve file metadata 1047ee443996SEric Van Hensbergen * @mnt: mount information 1048ee443996SEric Van Hensbergen * @dentry: file to get attributes on 1049ee443996SEric Van Hensbergen * @stat: metadata structure to populate 10502bad8471SEric Van Hensbergen * 10512bad8471SEric Van Hensbergen */ 10522bad8471SEric Van Hensbergen 10532bad8471SEric Van Hensbergen static int 10542bad8471SEric Van Hensbergen v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 10552bad8471SEric Van Hensbergen struct kstat *stat) 10562bad8471SEric Van Hensbergen { 1057bd238fb4SLatchesar Ionkov int err; 1058bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1059bd238fb4SLatchesar Ionkov struct p9_fid *fid; 106051a87c55SEric Van Hensbergen struct p9_wstat *st; 10612bad8471SEric Van Hensbergen 10625d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1063bd238fb4SLatchesar Ionkov err = -EPERM; 106442869c8aSAneesh Kumar K.V v9ses = v9fs_dentry2v9ses(dentry); 1065a1211908SAneesh Kumar K.V if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1066a1211908SAneesh Kumar K.V generic_fillattr(dentry->d_inode, stat); 1067a1211908SAneesh Kumar K.V return 0; 1068a1211908SAneesh Kumar K.V } 1069bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1070da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 1071da977b2cSEric Van Hensbergen return PTR_ERR(fid); 10722bad8471SEric Van Hensbergen 1073bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 1074bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 1075bd238fb4SLatchesar Ionkov return PTR_ERR(st); 10762bad8471SEric Van Hensbergen 1077bd238fb4SLatchesar Ionkov v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 10782bad8471SEric Van Hensbergen generic_fillattr(dentry->d_inode, stat); 10792bad8471SEric Van Hensbergen 108062b2be59SLatchesar Ionkov p9stat_free(st); 1081bd238fb4SLatchesar Ionkov kfree(st); 1082bd238fb4SLatchesar Ionkov return 0; 10832bad8471SEric Van Hensbergen } 10842bad8471SEric Van Hensbergen 10852bad8471SEric Van Hensbergen /** 10862bad8471SEric Van Hensbergen * v9fs_vfs_setattr - set file metadata 10872bad8471SEric Van Hensbergen * @dentry: file whose metadata to set 10882bad8471SEric Van Hensbergen * @iattr: metadata assignment structure 10892bad8471SEric Van Hensbergen * 10902bad8471SEric Van Hensbergen */ 10912bad8471SEric Van Hensbergen 10922bad8471SEric Van Hensbergen static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 10932bad8471SEric Van Hensbergen { 1094bd238fb4SLatchesar Ionkov int retval; 1095bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1096bd238fb4SLatchesar Ionkov struct p9_fid *fid; 1097bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 10982bad8471SEric Van Hensbergen 10995d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "\n"); 1100059c138bSAneesh Kumar K.V retval = inode_change_ok(dentry->d_inode, iattr); 1101059c138bSAneesh Kumar K.V if (retval) 1102059c138bSAneesh Kumar K.V return retval; 1103059c138bSAneesh Kumar K.V 1104bd238fb4SLatchesar Ionkov retval = -EPERM; 110542869c8aSAneesh Kumar K.V v9ses = v9fs_dentry2v9ses(dentry); 1106bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1107da977b2cSEric Van Hensbergen if(IS_ERR(fid)) 1108da977b2cSEric Van Hensbergen return PTR_ERR(fid); 11092bad8471SEric Van Hensbergen 1110531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 11112bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MODE) 1112531b1094SLatchesar Ionkov wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 11132bad8471SEric Van Hensbergen 11142bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MTIME) 1115531b1094SLatchesar Ionkov wstat.mtime = iattr->ia_mtime.tv_sec; 11162bad8471SEric Van Hensbergen 11172bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_ATIME) 1118531b1094SLatchesar Ionkov wstat.atime = iattr->ia_atime.tv_sec; 11192bad8471SEric Van Hensbergen 11202bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_SIZE) 1121531b1094SLatchesar Ionkov wstat.length = iattr->ia_size; 11222bad8471SEric Van Hensbergen 1123dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 1124531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_UID) 1125531b1094SLatchesar Ionkov wstat.n_uid = iattr->ia_uid; 11262bad8471SEric Van Hensbergen 1127531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_GID) 1128531b1094SLatchesar Ionkov wstat.n_gid = iattr->ia_gid; 11292bad8471SEric Van Hensbergen } 1130059c138bSAneesh Kumar K.V 11313dc5436aSAneesh Kumar K.V /* Write all dirty data */ 11323dc5436aSAneesh Kumar K.V if (S_ISREG(dentry->d_inode->i_mode)) 11333dc5436aSAneesh Kumar K.V filemap_write_and_wait(dentry->d_inode->i_mapping); 11343dc5436aSAneesh Kumar K.V 1135f10fc50fSAneesh Kumar K.V retval = p9_client_wstat(fid, &wstat); 1136f10fc50fSAneesh Kumar K.V if (retval < 0) 1137f10fc50fSAneesh Kumar K.V return retval; 1138059c138bSAneesh Kumar K.V 1139059c138bSAneesh Kumar K.V if ((iattr->ia_valid & ATTR_SIZE) && 1140059c138bSAneesh Kumar K.V iattr->ia_size != i_size_read(dentry->d_inode)) 1141059c138bSAneesh Kumar K.V truncate_setsize(dentry->d_inode, iattr->ia_size); 1142059c138bSAneesh Kumar K.V 1143f10fc50fSAneesh Kumar K.V v9fs_invalidate_inode_attr(dentry->d_inode); 11441025774cSChristoph Hellwig 11451025774cSChristoph Hellwig setattr_copy(dentry->d_inode, iattr); 11461025774cSChristoph Hellwig mark_inode_dirty(dentry->d_inode); 11471025774cSChristoph Hellwig return 0; 11482bad8471SEric Van Hensbergen } 11492bad8471SEric Van Hensbergen 11502bad8471SEric Van Hensbergen /** 1151531b1094SLatchesar Ionkov * v9fs_stat2inode - populate an inode structure with mistat info 1152531b1094SLatchesar Ionkov * @stat: Plan 9 metadata (mistat) structure 11532bad8471SEric Van Hensbergen * @inode: inode to populate 11542bad8471SEric Van Hensbergen * @sb: superblock of filesystem 11552bad8471SEric Van Hensbergen * 11562bad8471SEric Van Hensbergen */ 11572bad8471SEric Van Hensbergen 11582bad8471SEric Van Hensbergen void 115951a87c55SEric Van Hensbergen v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 11602bad8471SEric Van Hensbergen struct super_block *sb) 11612bad8471SEric Van Hensbergen { 11623eda0de6SAl Viro umode_t mode; 1163531b1094SLatchesar Ionkov char ext[32]; 11645717144aSAneesh Kumar K.V char tag_name[14]; 11655717144aSAneesh Kumar K.V unsigned int i_nlink; 11662bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 1167b3cbea03SAneesh Kumar K.V struct v9fs_inode *v9inode = V9FS_I(inode); 11682bad8471SEric Van Hensbergen 1169bfe86848SMiklos Szeredi set_nlink(inode, 1); 11702bad8471SEric Van Hensbergen 1171531b1094SLatchesar Ionkov inode->i_atime.tv_sec = stat->atime; 1172531b1094SLatchesar Ionkov inode->i_mtime.tv_sec = stat->mtime; 1173531b1094SLatchesar Ionkov inode->i_ctime.tv_sec = stat->mtime; 11742bad8471SEric Van Hensbergen 1175bd32b82dSLatchesar Ionkov inode->i_uid = v9ses->dfltuid; 1176bd32b82dSLatchesar Ionkov inode->i_gid = v9ses->dfltgid; 11772bad8471SEric Van Hensbergen 1178dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 1179531b1094SLatchesar Ionkov inode->i_uid = stat->n_uid; 1180531b1094SLatchesar Ionkov inode->i_gid = stat->n_gid; 1181531b1094SLatchesar Ionkov } 11825717144aSAneesh Kumar K.V if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 11835717144aSAneesh Kumar K.V if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 11845717144aSAneesh Kumar K.V /* 11855717144aSAneesh Kumar K.V * Hadlink support got added later to 11865717144aSAneesh Kumar K.V * to the .u extension. So there can be 11875717144aSAneesh Kumar K.V * server out there that doesn't support 11885717144aSAneesh Kumar K.V * this even with .u extension. So check 11895717144aSAneesh Kumar K.V * for non NULL stat->extension 11905717144aSAneesh Kumar K.V */ 11915717144aSAneesh Kumar K.V strncpy(ext, stat->extension, sizeof(ext)); 11925717144aSAneesh Kumar K.V /* HARDLINKCOUNT %u */ 11935717144aSAneesh Kumar K.V sscanf(ext, "%13s %u", tag_name, &i_nlink); 11945717144aSAneesh Kumar K.V if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 1195bfe86848SMiklos Szeredi set_nlink(inode, i_nlink); 11965717144aSAneesh Kumar K.V } 11975717144aSAneesh Kumar K.V } 1198df345c67SAneesh Kumar K.V mode = p9mode2perm(v9ses, stat); 119945089142SAneesh Kumar K.V mode |= inode->i_mode & ~S_IALLUGO; 120045089142SAneesh Kumar K.V inode->i_mode = mode; 12017549ae3eSAbhishek Kulkarni i_size_write(inode, stat->length); 12022bad8471SEric Van Hensbergen 1203bd238fb4SLatchesar Ionkov /* not real number of blocks, but 512 byte ones ... */ 12047549ae3eSAbhishek Kulkarni inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 1205b3cbea03SAneesh Kumar K.V v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 12062bad8471SEric Van Hensbergen } 12072bad8471SEric Van Hensbergen 12082bad8471SEric Van Hensbergen /** 12092bad8471SEric Van Hensbergen * v9fs_qid2ino - convert qid into inode number 12102bad8471SEric Van Hensbergen * @qid: qid to hash 12112bad8471SEric Van Hensbergen * 12122bad8471SEric Van Hensbergen * BUG: potential for inode number collisions? 12132bad8471SEric Van Hensbergen */ 12142bad8471SEric Van Hensbergen 1215bd238fb4SLatchesar Ionkov ino_t v9fs_qid2ino(struct p9_qid *qid) 12162bad8471SEric Van Hensbergen { 12172bad8471SEric Van Hensbergen u64 path = qid->path + 2; 12182bad8471SEric Van Hensbergen ino_t i = 0; 12192bad8471SEric Van Hensbergen 12202bad8471SEric Van Hensbergen if (sizeof(ino_t) == sizeof(path)) 12212bad8471SEric Van Hensbergen memcpy(&i, &path, sizeof(ino_t)); 12222bad8471SEric Van Hensbergen else 12232bad8471SEric Van Hensbergen i = (ino_t) (path ^ (path >> 32)); 12242bad8471SEric Van Hensbergen 12252bad8471SEric Van Hensbergen return i; 12262bad8471SEric Van Hensbergen } 12272bad8471SEric Van Hensbergen 12282bad8471SEric Van Hensbergen /** 12292bad8471SEric Van Hensbergen * v9fs_readlink - read a symlink's location (internal version) 12302bad8471SEric Van Hensbergen * @dentry: dentry for symlink 123173c592b9SEric Van Hensbergen * @buffer: buffer to load symlink location into 12322bad8471SEric Van Hensbergen * @buflen: length of buffer 12332bad8471SEric Van Hensbergen * 12342bad8471SEric Van Hensbergen */ 12352bad8471SEric Van Hensbergen 12362bad8471SEric Van Hensbergen static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 12372bad8471SEric Van Hensbergen { 1238bd238fb4SLatchesar Ionkov int retval; 12392bad8471SEric Van Hensbergen 1240bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1241bd238fb4SLatchesar Ionkov struct p9_fid *fid; 124251a87c55SEric Van Hensbergen struct p9_wstat *st; 12432bad8471SEric Van Hensbergen 12445d385153SJoe Perches p9_debug(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 1245bd238fb4SLatchesar Ionkov retval = -EPERM; 124642869c8aSAneesh Kumar K.V v9ses = v9fs_dentry2v9ses(dentry); 1247bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1248da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 1249da977b2cSEric Van Hensbergen return PTR_ERR(fid); 12502bad8471SEric Van Hensbergen 1251329176ccSM. Mohan Kumar if (!v9fs_proto_dotu(v9ses)) 1252bd238fb4SLatchesar Ionkov return -EBADF; 12532bad8471SEric Van Hensbergen 1254bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 1255bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 1256bd238fb4SLatchesar Ionkov return PTR_ERR(st); 12572bad8471SEric Van Hensbergen 1258bd238fb4SLatchesar Ionkov if (!(st->mode & P9_DMSYMLINK)) { 12592bad8471SEric Van Hensbergen retval = -EINVAL; 1260bd238fb4SLatchesar Ionkov goto done; 12612bad8471SEric Van Hensbergen } 12622bad8471SEric Van Hensbergen 12632bad8471SEric Van Hensbergen /* copy extension buffer into buffer */ 1264ba413ab2SJim Meyering retval = min(strlen(st->extension)+1, (size_t)buflen); 1265ba413ab2SJim Meyering memcpy(buffer, st->extension, retval); 12662bad8471SEric Van Hensbergen 1267ba413ab2SJim Meyering p9_debug(P9_DEBUG_VFS, "%s -> %s (%.*s)\n", 1268ba413ab2SJim Meyering dentry->d_name.name, st->extension, buflen, buffer); 1269bd238fb4SLatchesar Ionkov 1270bd238fb4SLatchesar Ionkov done: 127162b2be59SLatchesar Ionkov p9stat_free(st); 1272bd238fb4SLatchesar Ionkov kfree(st); 12732bad8471SEric Van Hensbergen return retval; 12742bad8471SEric Van Hensbergen } 12752bad8471SEric Van Hensbergen 12762bad8471SEric Van Hensbergen /** 12772bad8471SEric Van Hensbergen * v9fs_vfs_follow_link - follow a symlink path 12782bad8471SEric Van Hensbergen * @dentry: dentry for symlink 12792bad8471SEric Van Hensbergen * @nd: nameidata 12802bad8471SEric Van Hensbergen * 12812bad8471SEric Van Hensbergen */ 12822bad8471SEric Van Hensbergen 12832bad8471SEric Van Hensbergen static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 12842bad8471SEric Van Hensbergen { 12852bad8471SEric Van Hensbergen int len = 0; 12862bad8471SEric Van Hensbergen char *link = __getname(); 12872bad8471SEric Van Hensbergen 12885d385153SJoe Perches p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name); 12892bad8471SEric Van Hensbergen 12902bad8471SEric Van Hensbergen if (!link) 12912bad8471SEric Van Hensbergen link = ERR_PTR(-ENOMEM); 12922bad8471SEric Van Hensbergen else { 129316cce6d2SLatchesar Ionkov len = v9fs_readlink(dentry, link, PATH_MAX); 12942bad8471SEric Van Hensbergen 12952bad8471SEric Van Hensbergen if (len < 0) { 1296ce44eeb6SDavi Arnaut __putname(link); 12972bad8471SEric Van Hensbergen link = ERR_PTR(len); 12982bad8471SEric Van Hensbergen } else 12992511cd0bSMartin Stava link[min(len, PATH_MAX-1)] = 0; 13002bad8471SEric Van Hensbergen } 13012bad8471SEric Van Hensbergen nd_set_link(nd, link); 13022bad8471SEric Van Hensbergen 13032bad8471SEric Van Hensbergen return NULL; 13042bad8471SEric Van Hensbergen } 13052bad8471SEric Van Hensbergen 13062bad8471SEric Van Hensbergen /** 13072bad8471SEric Van Hensbergen * v9fs_vfs_put_link - release a symlink path 13082bad8471SEric Van Hensbergen * @dentry: dentry for symlink 13092bad8471SEric Van Hensbergen * @nd: nameidata 1310ee443996SEric Van Hensbergen * @p: unused 13112bad8471SEric Van Hensbergen * 13122bad8471SEric Van Hensbergen */ 13132bad8471SEric Van Hensbergen 131453c06f4eSAneesh Kumar K.V void 1315ee443996SEric Van Hensbergen v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 13162bad8471SEric Van Hensbergen { 13172bad8471SEric Van Hensbergen char *s = nd_get_link(nd); 13182bad8471SEric Van Hensbergen 13195d385153SJoe Perches p9_debug(P9_DEBUG_VFS, " %s %s\n", 13205d385153SJoe Perches dentry->d_name.name, IS_ERR(s) ? "<error>" : s); 13212bad8471SEric Van Hensbergen if (!IS_ERR(s)) 1322ce44eeb6SDavi Arnaut __putname(s); 13232bad8471SEric Van Hensbergen } 13242bad8471SEric Van Hensbergen 1325ee443996SEric Van Hensbergen /** 1326ee443996SEric Van Hensbergen * v9fs_vfs_mkspecial - create a special file 1327ee443996SEric Van Hensbergen * @dir: inode to create special file in 1328ee443996SEric Van Hensbergen * @dentry: dentry to create 1329ee443996SEric Van Hensbergen * @mode: mode to create special file 1330ee443996SEric Van Hensbergen * @extension: 9p2000.u format extension string representing special file 1331ee443996SEric Van Hensbergen * 1332ee443996SEric Van Hensbergen */ 1333ee443996SEric Van Hensbergen 1334531b1094SLatchesar Ionkov static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1335c2837de7SAl Viro u32 perm, const char *extension) 1336531b1094SLatchesar Ionkov { 1337bd238fb4SLatchesar Ionkov struct p9_fid *fid; 1338d28c61f0SAneesh Kumar K.V struct v9fs_session_info *v9ses; 1339531b1094SLatchesar Ionkov 13406a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 1341dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) { 13425d385153SJoe Perches p9_debug(P9_DEBUG_ERROR, "not extended\n"); 13436a3124a3SLatchesar Ionkov return -EPERM; 1344531b1094SLatchesar Ionkov } 1345531b1094SLatchesar Ionkov 1346bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1347bd238fb4SLatchesar Ionkov P9_OREAD); 1348bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) 1349bd238fb4SLatchesar Ionkov return PTR_ERR(fid); 1350da977b2cSEric Van Hensbergen 1351d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(dir); 1352bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 13536a3124a3SLatchesar Ionkov return 0; 1354531b1094SLatchesar Ionkov } 1355531b1094SLatchesar Ionkov 1356531b1094SLatchesar Ionkov /** 1357531b1094SLatchesar Ionkov * v9fs_vfs_symlink - helper function to create symlinks 1358531b1094SLatchesar Ionkov * @dir: directory inode containing symlink 1359531b1094SLatchesar Ionkov * @dentry: dentry for symlink 1360531b1094SLatchesar Ionkov * @symname: symlink data 1361531b1094SLatchesar Ionkov * 1362ee443996SEric Van Hensbergen * See Also: 9P2000.u RFC for more information 1363531b1094SLatchesar Ionkov * 1364531b1094SLatchesar Ionkov */ 1365531b1094SLatchesar Ionkov 1366531b1094SLatchesar Ionkov static int 1367531b1094SLatchesar Ionkov v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1368531b1094SLatchesar Ionkov { 13695d385153SJoe Perches p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n", 13705d385153SJoe Perches dir->i_ino, dentry->d_name.name, symname); 1371531b1094SLatchesar Ionkov 1372c2837de7SAl Viro return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1373531b1094SLatchesar Ionkov } 1374531b1094SLatchesar Ionkov 13752bad8471SEric Van Hensbergen /** 13762bad8471SEric Van Hensbergen * v9fs_vfs_link - create a hardlink 13772bad8471SEric Van Hensbergen * @old_dentry: dentry for file to link to 13782bad8471SEric Van Hensbergen * @dir: inode destination for new link 137973c592b9SEric Van Hensbergen * @dentry: dentry for link 13802bad8471SEric Van Hensbergen * 13812bad8471SEric Van Hensbergen */ 13822bad8471SEric Van Hensbergen 13832bad8471SEric Van Hensbergen static int 13842bad8471SEric Van Hensbergen v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 13852bad8471SEric Van Hensbergen struct dentry *dentry) 13862bad8471SEric Van Hensbergen { 1387531b1094SLatchesar Ionkov int retval; 1388531b1094SLatchesar Ionkov char *name; 1389d28c61f0SAneesh Kumar K.V struct p9_fid *oldfid; 13902bad8471SEric Van Hensbergen 13915d385153SJoe Perches p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n", 13925d385153SJoe Perches dir->i_ino, dentry->d_name.name, old_dentry->d_name.name); 13932bad8471SEric Van Hensbergen 1394da977b2cSEric Van Hensbergen oldfid = v9fs_fid_clone(old_dentry); 1395da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 1396da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 13972bad8471SEric Van Hensbergen 1398531b1094SLatchesar Ionkov name = __getname(); 1399da977b2cSEric Van Hensbergen if (unlikely(!name)) { 1400da977b2cSEric Van Hensbergen retval = -ENOMEM; 1401da977b2cSEric Van Hensbergen goto clunk_fid; 1402da977b2cSEric Van Hensbergen } 14030710d36aSFlorin Malita 140416cce6d2SLatchesar Ionkov sprintf(name, "%d\n", oldfid->fid); 1405bd238fb4SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1406531b1094SLatchesar Ionkov __putname(name); 1407c06c066aSAneesh Kumar K.V if (!retval) { 1408c06c066aSAneesh Kumar K.V v9fs_refresh_inode(oldfid, old_dentry->d_inode); 1409d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(dir); 1410c06c066aSAneesh Kumar K.V } 1411da977b2cSEric Van Hensbergen clunk_fid: 1412bd238fb4SLatchesar Ionkov p9_client_clunk(oldfid); 14132bad8471SEric Van Hensbergen return retval; 14142bad8471SEric Van Hensbergen } 14152bad8471SEric Van Hensbergen 14162bad8471SEric Van Hensbergen /** 14172bad8471SEric Van Hensbergen * v9fs_vfs_mknod - create a special file 14182bad8471SEric Van Hensbergen * @dir: inode destination for new link 14192bad8471SEric Van Hensbergen * @dentry: dentry for file 14202bad8471SEric Van Hensbergen * @mode: mode for creation 1421ee443996SEric Van Hensbergen * @rdev: device associated with special file 14222bad8471SEric Van Hensbergen * 14232bad8471SEric Van Hensbergen */ 14242bad8471SEric Van Hensbergen 14252bad8471SEric Van Hensbergen static int 14261a67aafbSAl Viro v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 14272bad8471SEric Van Hensbergen { 1428c2837de7SAl Viro struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1429531b1094SLatchesar Ionkov int retval; 1430531b1094SLatchesar Ionkov char *name; 1431c2837de7SAl Viro u32 perm; 14322bad8471SEric Van Hensbergen 1433609eac1cSLinus Torvalds p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n", 14345d385153SJoe Perches dir->i_ino, dentry->d_name.name, mode, 14355d385153SJoe Perches MAJOR(rdev), MINOR(rdev)); 14362bad8471SEric Van Hensbergen 1437531b1094SLatchesar Ionkov if (!new_valid_dev(rdev)) 1438531b1094SLatchesar Ionkov return -EINVAL; 143973c592b9SEric Van Hensbergen 1440531b1094SLatchesar Ionkov name = __getname(); 1441c0291a05SEugene Teo if (!name) 1442c0291a05SEugene Teo return -ENOMEM; 14432bad8471SEric Van Hensbergen /* build extension */ 14442bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 1445531b1094SLatchesar Ionkov sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 14462bad8471SEric Van Hensbergen else if (S_ISCHR(mode)) 1447531b1094SLatchesar Ionkov sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 144873c592b9SEric Van Hensbergen else if (S_ISFIFO(mode)) 1449531b1094SLatchesar Ionkov *name = 0; 145075cc5c9bSVenkateswararao Jujjuri else if (S_ISSOCK(mode)) 145175cc5c9bSVenkateswararao Jujjuri *name = 0; 14522bad8471SEric Van Hensbergen else { 1453531b1094SLatchesar Ionkov __putname(name); 1454531b1094SLatchesar Ionkov return -EINVAL; 14552bad8471SEric Van Hensbergen } 14562bad8471SEric Van Hensbergen 1457c2837de7SAl Viro perm = unixmode2p9mode(v9ses, mode); 1458c2837de7SAl Viro retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1459531b1094SLatchesar Ionkov __putname(name); 14602bad8471SEric Van Hensbergen 14612bad8471SEric Van Hensbergen return retval; 14622bad8471SEric Van Hensbergen } 14632bad8471SEric Van Hensbergen 1464b3cbea03SAneesh Kumar K.V int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1465b3cbea03SAneesh Kumar K.V { 146645089142SAneesh Kumar K.V int umode; 146745089142SAneesh Kumar K.V dev_t rdev; 1468b3cbea03SAneesh Kumar K.V loff_t i_size; 1469b3cbea03SAneesh Kumar K.V struct p9_wstat *st; 1470b3cbea03SAneesh Kumar K.V struct v9fs_session_info *v9ses; 1471b3cbea03SAneesh Kumar K.V 1472b3cbea03SAneesh Kumar K.V v9ses = v9fs_inode2v9ses(inode); 1473b3cbea03SAneesh Kumar K.V st = p9_client_stat(fid); 1474b3cbea03SAneesh Kumar K.V if (IS_ERR(st)) 1475b3cbea03SAneesh Kumar K.V return PTR_ERR(st); 147645089142SAneesh Kumar K.V /* 147745089142SAneesh Kumar K.V * Don't update inode if the file type is different 147845089142SAneesh Kumar K.V */ 147945089142SAneesh Kumar K.V umode = p9mode2unixmode(v9ses, st, &rdev); 148045089142SAneesh Kumar K.V if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 148145089142SAneesh Kumar K.V goto out; 1482b3cbea03SAneesh Kumar K.V 1483b3cbea03SAneesh Kumar K.V spin_lock(&inode->i_lock); 1484b3cbea03SAneesh Kumar K.V /* 1485b3cbea03SAneesh Kumar K.V * We don't want to refresh inode->i_size, 1486b3cbea03SAneesh Kumar K.V * because we may have cached data 1487b3cbea03SAneesh Kumar K.V */ 1488b3cbea03SAneesh Kumar K.V i_size = inode->i_size; 1489b3cbea03SAneesh Kumar K.V v9fs_stat2inode(st, inode, inode->i_sb); 1490b3cbea03SAneesh Kumar K.V if (v9ses->cache) 1491b3cbea03SAneesh Kumar K.V inode->i_size = i_size; 1492b3cbea03SAneesh Kumar K.V spin_unlock(&inode->i_lock); 149345089142SAneesh Kumar K.V out: 1494b3cbea03SAneesh Kumar K.V p9stat_free(st); 1495b3cbea03SAneesh Kumar K.V kfree(st); 1496b3cbea03SAneesh Kumar K.V return 0; 1497b3cbea03SAneesh Kumar K.V } 1498b3cbea03SAneesh Kumar K.V 14999b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotu = { 15009b6533c9SSripathi Kodi .create = v9fs_vfs_create, 15019b6533c9SSripathi Kodi .lookup = v9fs_vfs_lookup, 1502e43ae79cSMiklos Szeredi .atomic_open = v9fs_vfs_atomic_open, 15039b6533c9SSripathi Kodi .symlink = v9fs_vfs_symlink, 150450cc42ffSVenkateswararao Jujjuri (JV) .link = v9fs_vfs_link, 15059b6533c9SSripathi Kodi .unlink = v9fs_vfs_unlink, 15069b6533c9SSripathi Kodi .mkdir = v9fs_vfs_mkdir, 15079b6533c9SSripathi Kodi .rmdir = v9fs_vfs_rmdir, 15081d76e313SAneesh Kumar K.V .mknod = v9fs_vfs_mknod, 15099b6533c9SSripathi Kodi .rename = v9fs_vfs_rename, 15109b6533c9SSripathi Kodi .getattr = v9fs_vfs_getattr, 15119b6533c9SSripathi Kodi .setattr = v9fs_vfs_setattr, 15129b6533c9SSripathi Kodi }; 15139b6533c9SSripathi Kodi 1514754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations = { 1515b501611aSEric Van Hensbergen .create = v9fs_vfs_create, 1516b501611aSEric Van Hensbergen .lookup = v9fs_vfs_lookup, 1517e43ae79cSMiklos Szeredi .atomic_open = v9fs_vfs_atomic_open, 1518b501611aSEric Van Hensbergen .unlink = v9fs_vfs_unlink, 1519b501611aSEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 1520b501611aSEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 1521b501611aSEric Van Hensbergen .mknod = v9fs_vfs_mknod, 1522b501611aSEric Van Hensbergen .rename = v9fs_vfs_rename, 1523b501611aSEric Van Hensbergen .getattr = v9fs_vfs_getattr, 1524b501611aSEric Van Hensbergen .setattr = v9fs_vfs_setattr, 1525b501611aSEric Van Hensbergen }; 1526b501611aSEric Van Hensbergen 1527754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations = { 15282bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 15292bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 15302bad8471SEric Van Hensbergen }; 15312bad8471SEric Van Hensbergen 1532754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations = { 1533204f2f0eSAl Viro .readlink = generic_readlink, 15342bad8471SEric Van Hensbergen .follow_link = v9fs_vfs_follow_link, 15352bad8471SEric Van Hensbergen .put_link = v9fs_vfs_put_link, 15362bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 15372bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 15382bad8471SEric Van Hensbergen }; 15399b6533c9SSripathi Kodi 1540