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 262bad8471SEric Van Hensbergen #include <linux/module.h> 272bad8471SEric Van Hensbergen #include <linux/errno.h> 282bad8471SEric Van Hensbergen #include <linux/fs.h> 292bad8471SEric Van Hensbergen #include <linux/file.h> 302bad8471SEric Van Hensbergen #include <linux/pagemap.h> 312bad8471SEric Van Hensbergen #include <linux/stat.h> 322bad8471SEric Van Hensbergen #include <linux/string.h> 332bad8471SEric Van Hensbergen #include <linux/inet.h> 342bad8471SEric Van Hensbergen #include <linux/namei.h> 352bad8471SEric Van Hensbergen #include <linux/idr.h> 36e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 375a0e3ad6STejun Heo #include <linux/slab.h> 38ebf46264SAneesh Kumar K.V #include <linux/xattr.h> 3985ff872dSAneesh Kumar K.V #include <linux/posix_acl.h> 40bd238fb4SLatchesar Ionkov #include <net/9p/9p.h> 41bd238fb4SLatchesar Ionkov #include <net/9p/client.h> 422bad8471SEric Van Hensbergen 432bad8471SEric Van Hensbergen #include "v9fs.h" 442bad8471SEric Van Hensbergen #include "v9fs_vfs.h" 452bad8471SEric Van Hensbergen #include "fid.h" 4660e78d2cSAbhishek Kulkarni #include "cache.h" 47ebf46264SAneesh Kumar K.V #include "xattr.h" 4885ff872dSAneesh Kumar K.V #include "acl.h" 492bad8471SEric Van Hensbergen 50754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations; 519b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotu; 52754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations; 53754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations; 54f5fc6145SAneesh Kumar K.V 552bad8471SEric Van Hensbergen /** 562bad8471SEric Van Hensbergen * unixmode2p9mode - convert unix mode bits to plan 9 572bad8471SEric Van Hensbergen * @v9ses: v9fs session information 582bad8471SEric Van Hensbergen * @mode: mode to convert 592bad8471SEric Van Hensbergen * 602bad8471SEric Van Hensbergen */ 612bad8471SEric Van Hensbergen 6273c592b9SEric Van Hensbergen static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) 632bad8471SEric Van Hensbergen { 642bad8471SEric Van Hensbergen int res; 652bad8471SEric Van Hensbergen res = mode & 0777; 662bad8471SEric Van Hensbergen if (S_ISDIR(mode)) 67bd238fb4SLatchesar Ionkov res |= P9_DMDIR; 68dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 692bad8471SEric Van Hensbergen if (S_ISLNK(mode)) 70bd238fb4SLatchesar Ionkov res |= P9_DMSYMLINK; 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; 88bd238fb4SLatchesar Ionkov if ((mode & P9_DMLINK)) 89bd238fb4SLatchesar Ionkov res |= P9_DMLINK; 902bad8471SEric Van Hensbergen } 912bad8471SEric Van Hensbergen 922bad8471SEric Van Hensbergen return res; 932bad8471SEric Van Hensbergen } 942bad8471SEric Van Hensbergen 952bad8471SEric Van Hensbergen /** 962bad8471SEric Van Hensbergen * p9mode2unixmode- convert plan9 mode bits to unix mode bits 972bad8471SEric Van Hensbergen * @v9ses: v9fs session information 982bad8471SEric Van Hensbergen * @mode: mode to convert 992bad8471SEric Van Hensbergen * 1002bad8471SEric Van Hensbergen */ 1012bad8471SEric Van Hensbergen 10273c592b9SEric Van Hensbergen static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) 1032bad8471SEric Van Hensbergen { 1042bad8471SEric Van Hensbergen int res; 1052bad8471SEric Van Hensbergen 1062bad8471SEric Van Hensbergen res = mode & 0777; 1072bad8471SEric Van Hensbergen 108bd238fb4SLatchesar Ionkov if ((mode & P9_DMDIR) == P9_DMDIR) 1092bad8471SEric Van Hensbergen res |= S_IFDIR; 110dd6102fbSSripathi Kodi else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) 1112bad8471SEric Van Hensbergen res |= S_IFLNK; 112dd6102fbSSripathi Kodi else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) 1132bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1142bad8471SEric Van Hensbergen res |= S_IFSOCK; 115dd6102fbSSripathi Kodi else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) 1162bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1172bad8471SEric Van Hensbergen res |= S_IFIFO; 118dd6102fbSSripathi Kodi else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) 1192bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1202bad8471SEric Van Hensbergen res |= S_IFBLK; 1212bad8471SEric Van Hensbergen else 1222bad8471SEric Van Hensbergen res |= S_IFREG; 1232bad8471SEric Van Hensbergen 124dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 125bd238fb4SLatchesar Ionkov if ((mode & P9_DMSETUID) == P9_DMSETUID) 1262bad8471SEric Van Hensbergen res |= S_ISUID; 1272bad8471SEric Van Hensbergen 128bd238fb4SLatchesar Ionkov if ((mode & P9_DMSETGID) == P9_DMSETGID) 1292bad8471SEric Van Hensbergen res |= S_ISGID; 130d199d652SAnthony Liguori 131d199d652SAnthony Liguori if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 132d199d652SAnthony Liguori res |= S_ISVTX; 1332bad8471SEric Van Hensbergen } 1342bad8471SEric Van Hensbergen 1352bad8471SEric Van Hensbergen return res; 1362bad8471SEric Van Hensbergen } 1372bad8471SEric Van Hensbergen 138ee443996SEric Van Hensbergen /** 139ee443996SEric Van Hensbergen * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 140ee443996SEric Van Hensbergen * @uflags: flags to convert 1412e4bef41SEric Van Hensbergen * @extended: if .u extensions are active 142ee443996SEric Van Hensbergen */ 143ee443996SEric Van Hensbergen 1442e4bef41SEric Van Hensbergen int v9fs_uflags2omode(int uflags, int extended) 1456a3124a3SLatchesar Ionkov { 1466a3124a3SLatchesar Ionkov int ret; 1476a3124a3SLatchesar Ionkov 1486a3124a3SLatchesar Ionkov ret = 0; 1496a3124a3SLatchesar Ionkov switch (uflags&3) { 1506a3124a3SLatchesar Ionkov default: 1516a3124a3SLatchesar Ionkov case O_RDONLY: 152bd238fb4SLatchesar Ionkov ret = P9_OREAD; 1536a3124a3SLatchesar Ionkov break; 1546a3124a3SLatchesar Ionkov 1556a3124a3SLatchesar Ionkov case O_WRONLY: 156bd238fb4SLatchesar Ionkov ret = P9_OWRITE; 1576a3124a3SLatchesar Ionkov break; 1586a3124a3SLatchesar Ionkov 1596a3124a3SLatchesar Ionkov case O_RDWR: 160bd238fb4SLatchesar Ionkov ret = P9_ORDWR; 1616a3124a3SLatchesar Ionkov break; 1626a3124a3SLatchesar Ionkov } 1636a3124a3SLatchesar Ionkov 1646a3124a3SLatchesar Ionkov if (uflags & O_TRUNC) 165bd238fb4SLatchesar Ionkov ret |= P9_OTRUNC; 1666a3124a3SLatchesar Ionkov 1672e4bef41SEric Van Hensbergen if (extended) { 1682e4bef41SEric Van Hensbergen if (uflags & O_EXCL) 1692e4bef41SEric Van Hensbergen ret |= P9_OEXCL; 1702e4bef41SEric Van Hensbergen 1716a3124a3SLatchesar Ionkov if (uflags & O_APPEND) 172bd238fb4SLatchesar Ionkov ret |= P9_OAPPEND; 1732e4bef41SEric Van Hensbergen } 1746a3124a3SLatchesar Ionkov 1756a3124a3SLatchesar Ionkov return ret; 1766a3124a3SLatchesar Ionkov } 1776a3124a3SLatchesar Ionkov 1782bad8471SEric Van Hensbergen /** 179531b1094SLatchesar Ionkov * v9fs_blank_wstat - helper function to setup a 9P stat structure 180531b1094SLatchesar Ionkov * @wstat: structure to initialize 1812bad8471SEric Van Hensbergen * 1822bad8471SEric Van Hensbergen */ 1832bad8471SEric Van Hensbergen 1847a4439c4SM. Mohan Kumar void 185bd238fb4SLatchesar Ionkov v9fs_blank_wstat(struct p9_wstat *wstat) 1862bad8471SEric Van Hensbergen { 187531b1094SLatchesar Ionkov wstat->type = ~0; 188531b1094SLatchesar Ionkov wstat->dev = ~0; 189531b1094SLatchesar Ionkov wstat->qid.type = ~0; 190531b1094SLatchesar Ionkov wstat->qid.version = ~0; 191531b1094SLatchesar Ionkov *((long long *)&wstat->qid.path) = ~0; 192531b1094SLatchesar Ionkov wstat->mode = ~0; 193531b1094SLatchesar Ionkov wstat->atime = ~0; 194531b1094SLatchesar Ionkov wstat->mtime = ~0; 195531b1094SLatchesar Ionkov wstat->length = ~0; 196531b1094SLatchesar Ionkov wstat->name = NULL; 197531b1094SLatchesar Ionkov wstat->uid = NULL; 198531b1094SLatchesar Ionkov wstat->gid = NULL; 199531b1094SLatchesar Ionkov wstat->muid = NULL; 200531b1094SLatchesar Ionkov wstat->n_uid = ~0; 201531b1094SLatchesar Ionkov wstat->n_gid = ~0; 202531b1094SLatchesar Ionkov wstat->n_muid = ~0; 203531b1094SLatchesar Ionkov wstat->extension = NULL; 2042bad8471SEric Van Hensbergen } 2052bad8471SEric Van Hensbergen 20660e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 20760e78d2cSAbhishek Kulkarni /** 20860e78d2cSAbhishek Kulkarni * v9fs_alloc_inode - helper function to allocate an inode 20960e78d2cSAbhishek Kulkarni * This callback is executed before setting up the inode so that we 21060e78d2cSAbhishek Kulkarni * can associate a vcookie with each inode. 21160e78d2cSAbhishek Kulkarni * 21260e78d2cSAbhishek Kulkarni */ 21360e78d2cSAbhishek Kulkarni 21460e78d2cSAbhishek Kulkarni struct inode *v9fs_alloc_inode(struct super_block *sb) 21560e78d2cSAbhishek Kulkarni { 21660e78d2cSAbhishek Kulkarni struct v9fs_cookie *vcookie; 21760e78d2cSAbhishek Kulkarni vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache, 21860e78d2cSAbhishek Kulkarni GFP_KERNEL); 21960e78d2cSAbhishek Kulkarni if (!vcookie) 22060e78d2cSAbhishek Kulkarni return NULL; 22160e78d2cSAbhishek Kulkarni 22260e78d2cSAbhishek Kulkarni vcookie->fscache = NULL; 22360e78d2cSAbhishek Kulkarni vcookie->qid = NULL; 22460e78d2cSAbhishek Kulkarni spin_lock_init(&vcookie->lock); 22560e78d2cSAbhishek Kulkarni return &vcookie->inode; 22660e78d2cSAbhishek Kulkarni } 22760e78d2cSAbhishek Kulkarni 22860e78d2cSAbhishek Kulkarni /** 22960e78d2cSAbhishek Kulkarni * v9fs_destroy_inode - destroy an inode 23060e78d2cSAbhishek Kulkarni * 23160e78d2cSAbhishek Kulkarni */ 23260e78d2cSAbhishek Kulkarni 233fa0d7e3dSNick Piggin static void v9fs_i_callback(struct rcu_head *head) 234fa0d7e3dSNick Piggin { 235fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 236fa0d7e3dSNick Piggin INIT_LIST_HEAD(&inode->i_dentry); 237fa0d7e3dSNick Piggin kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode)); 238fa0d7e3dSNick Piggin } 239fa0d7e3dSNick Piggin 24060e78d2cSAbhishek Kulkarni void v9fs_destroy_inode(struct inode *inode) 24160e78d2cSAbhishek Kulkarni { 242fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, v9fs_i_callback); 24360e78d2cSAbhishek Kulkarni } 24460e78d2cSAbhishek Kulkarni #endif 24560e78d2cSAbhishek Kulkarni 2462bad8471SEric Van Hensbergen /** 2472bad8471SEric Van Hensbergen * v9fs_get_inode - helper function to setup an inode 2482bad8471SEric Van Hensbergen * @sb: superblock 2492bad8471SEric Van Hensbergen * @mode: mode to setup inode with 2502bad8471SEric Van Hensbergen * 2512bad8471SEric Van Hensbergen */ 2522bad8471SEric Van Hensbergen 2532bad8471SEric Van Hensbergen struct inode *v9fs_get_inode(struct super_block *sb, int mode) 2542bad8471SEric Van Hensbergen { 2552bb54115SAbhishek Kulkarni int err; 2566a3124a3SLatchesar Ionkov struct inode *inode; 257b501611aSEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 2582bad8471SEric Van Hensbergen 259bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 2602bad8471SEric Van Hensbergen 2612bad8471SEric Van Hensbergen inode = new_inode(sb); 2622bb54115SAbhishek Kulkarni if (!inode) { 2632bb54115SAbhishek Kulkarni P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); 26448559b4cSAbhishek Kulkarni return ERR_PTR(-ENOMEM); 2652bb54115SAbhishek Kulkarni } 2662bb54115SAbhishek Kulkarni 267217f206dSDmitry Monakhov inode_init_owner(inode, NULL, mode); 2682bad8471SEric Van Hensbergen inode->i_blocks = 0; 2692bad8471SEric Van Hensbergen inode->i_rdev = 0; 2702bad8471SEric Van Hensbergen inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 271147b31cfSEric Van Hensbergen inode->i_mapping->a_ops = &v9fs_addr_operations; 2722bad8471SEric Van Hensbergen 2732bad8471SEric Van Hensbergen switch (mode & S_IFMT) { 2742bad8471SEric Van Hensbergen case S_IFIFO: 2752bad8471SEric Van Hensbergen case S_IFBLK: 2762bad8471SEric Van Hensbergen case S_IFCHR: 2772bad8471SEric Van Hensbergen case S_IFSOCK: 2784b43516aSM. Mohan Kumar if (v9fs_proto_dotl(v9ses)) { 2794b43516aSM. Mohan Kumar inode->i_op = &v9fs_file_inode_operations_dotl; 2804b43516aSM. Mohan Kumar inode->i_fop = &v9fs_file_operations_dotl; 2814b43516aSM. Mohan Kumar } else if (v9fs_proto_dotu(v9ses)) { 2824b43516aSM. Mohan Kumar inode->i_op = &v9fs_file_inode_operations; 2834b43516aSM. Mohan Kumar inode->i_fop = &v9fs_file_operations; 2844b43516aSM. Mohan Kumar } else { 285bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 286bd238fb4SLatchesar Ionkov "special files without extended mode\n"); 2872bb54115SAbhishek Kulkarni err = -EINVAL; 2882bb54115SAbhishek Kulkarni goto error; 289b501611aSEric Van Hensbergen } 2902bb54115SAbhishek Kulkarni init_special_inode(inode, inode->i_mode, inode->i_rdev); 2915d58bec5SEric Van Hensbergen break; 2922bad8471SEric Van Hensbergen case S_IFREG: 2939b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 2949b6533c9SSripathi Kodi inode->i_op = &v9fs_file_inode_operations_dotl; 29529236f4eSAneesh Kumar K.V if (v9ses->cache) 29629236f4eSAneesh Kumar K.V inode->i_fop = 29729236f4eSAneesh Kumar K.V &v9fs_cached_file_operations_dotl; 29829236f4eSAneesh Kumar K.V else 2999b6533c9SSripathi Kodi inode->i_fop = &v9fs_file_operations_dotl; 3009b6533c9SSripathi Kodi } else { 3012bad8471SEric Van Hensbergen inode->i_op = &v9fs_file_inode_operations; 30229236f4eSAneesh Kumar K.V if (v9ses->cache) 30329236f4eSAneesh Kumar K.V inode->i_fop = &v9fs_cached_file_operations; 30429236f4eSAneesh Kumar K.V else 3052bad8471SEric Van Hensbergen inode->i_fop = &v9fs_file_operations; 3069b6533c9SSripathi Kodi } 3079b6533c9SSripathi Kodi 3082bad8471SEric Van Hensbergen break; 3099b6533c9SSripathi Kodi 310b501611aSEric Van Hensbergen case S_IFLNK: 3119b6533c9SSripathi Kodi if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 3129b6533c9SSripathi Kodi P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " 3139b6533c9SSripathi Kodi "legacy protocol.\n"); 3142bb54115SAbhishek Kulkarni err = -EINVAL; 3152bb54115SAbhishek Kulkarni goto error; 316b501611aSEric Van Hensbergen } 3179b6533c9SSripathi Kodi 3189b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3199b6533c9SSripathi Kodi inode->i_op = &v9fs_symlink_inode_operations_dotl; 3209b6533c9SSripathi Kodi else 321b501611aSEric Van Hensbergen inode->i_op = &v9fs_symlink_inode_operations; 3229b6533c9SSripathi Kodi 323b501611aSEric Van Hensbergen break; 3242bad8471SEric Van Hensbergen case S_IFDIR: 325d8c76e6fSDave Hansen inc_nlink(inode); 3269b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3279b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotl; 3289b6533c9SSripathi Kodi else if (v9fs_proto_dotu(v9ses)) 3299b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotu; 330b501611aSEric Van Hensbergen else 3312bad8471SEric Van Hensbergen inode->i_op = &v9fs_dir_inode_operations; 3329b6533c9SSripathi Kodi 3339b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3349b6533c9SSripathi Kodi inode->i_fop = &v9fs_dir_operations_dotl; 3359b6533c9SSripathi Kodi else 3362bad8471SEric Van Hensbergen inode->i_fop = &v9fs_dir_operations; 3379b6533c9SSripathi Kodi 3382bad8471SEric Van Hensbergen break; 3392bad8471SEric Van Hensbergen default: 3402bb54115SAbhishek Kulkarni P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 3412bad8471SEric Van Hensbergen mode, mode & S_IFMT); 3422bb54115SAbhishek Kulkarni err = -EINVAL; 3432bb54115SAbhishek Kulkarni goto error; 3442bad8471SEric Van Hensbergen } 3452bb54115SAbhishek Kulkarni 3462bad8471SEric Van Hensbergen return inode; 3472bb54115SAbhishek Kulkarni 3482bb54115SAbhishek Kulkarni error: 3492bb54115SAbhishek Kulkarni iput(inode); 3502bb54115SAbhishek Kulkarni return ERR_PTR(err); 3512bad8471SEric Van Hensbergen } 3522bad8471SEric Van Hensbergen 353bd238fb4SLatchesar Ionkov /* 3546a3124a3SLatchesar Ionkov static struct v9fs_fid* 3556a3124a3SLatchesar Ionkov v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 3566a3124a3SLatchesar Ionkov { 3576a3124a3SLatchesar Ionkov int err; 358736c4b85SMika Kukkonen int nfid; 3596a3124a3SLatchesar Ionkov struct v9fs_fid *ret; 3606a3124a3SLatchesar Ionkov struct v9fs_fcall *fcall; 3610b8dd177SLatchesar Ionkov 3626a3124a3SLatchesar Ionkov nfid = v9fs_get_idpool(&v9ses->fidpool); 3636a3124a3SLatchesar Ionkov if (nfid < 0) { 3640b8dd177SLatchesar Ionkov eprintk(KERN_WARNING, "no free fids available\n"); 365731805b4SLatchesar Ionkov return ERR_PTR(-ENOSPC); 3660b8dd177SLatchesar Ionkov } 3670b8dd177SLatchesar Ionkov 3686a3124a3SLatchesar Ionkov err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 3696a3124a3SLatchesar Ionkov &fcall); 3706a3124a3SLatchesar Ionkov 3716a3124a3SLatchesar Ionkov if (err < 0) { 37241e5a6acSLatchesar Ionkov if (fcall && fcall->id == RWALK) 37341e5a6acSLatchesar Ionkov goto clunk_fid; 37441e5a6acSLatchesar Ionkov 3756a3124a3SLatchesar Ionkov PRINT_FCALL_ERROR("walk error", fcall); 3766a3124a3SLatchesar Ionkov v9fs_put_idpool(nfid, &v9ses->fidpool); 3776a3124a3SLatchesar Ionkov goto error; 3780b8dd177SLatchesar Ionkov } 3796a3124a3SLatchesar Ionkov 3803cf6429aSLatchesar Ionkov kfree(fcall); 3813cf6429aSLatchesar Ionkov fcall = NULL; 3826a3124a3SLatchesar Ionkov ret = v9fs_fid_create(v9ses, nfid); 3836a3124a3SLatchesar Ionkov if (!ret) { 3846a3124a3SLatchesar Ionkov err = -ENOMEM; 3856a3124a3SLatchesar Ionkov goto clunk_fid; 3860b8dd177SLatchesar Ionkov } 3872bad8471SEric Van Hensbergen 3886a3124a3SLatchesar Ionkov err = v9fs_fid_insert(ret, dentry); 3896a3124a3SLatchesar Ionkov if (err < 0) { 3906a3124a3SLatchesar Ionkov v9fs_fid_destroy(ret); 3916a3124a3SLatchesar Ionkov goto clunk_fid; 3926a3124a3SLatchesar Ionkov } 3932bad8471SEric Van Hensbergen 3946a3124a3SLatchesar Ionkov return ret; 3956a3124a3SLatchesar Ionkov 3966a3124a3SLatchesar Ionkov clunk_fid: 3976a3124a3SLatchesar Ionkov v9fs_t_clunk(v9ses, nfid); 3986a3124a3SLatchesar Ionkov 3996a3124a3SLatchesar Ionkov error: 4006a3124a3SLatchesar Ionkov kfree(fcall); 4016a3124a3SLatchesar Ionkov return ERR_PTR(err); 4026a3124a3SLatchesar Ionkov } 403bd238fb4SLatchesar Ionkov */ 4046a3124a3SLatchesar Ionkov 40560e78d2cSAbhishek Kulkarni 40660e78d2cSAbhishek Kulkarni /** 40760e78d2cSAbhishek Kulkarni * v9fs_clear_inode - release an inode 40860e78d2cSAbhishek Kulkarni * @inode: inode to release 40960e78d2cSAbhishek Kulkarni * 41060e78d2cSAbhishek Kulkarni */ 411b57922d9SAl Viro void v9fs_evict_inode(struct inode *inode) 41260e78d2cSAbhishek Kulkarni { 413b57922d9SAl Viro truncate_inode_pages(inode->i_mapping, 0); 414b57922d9SAl Viro end_writeback(inode); 41560e78d2cSAbhishek Kulkarni filemap_fdatawrite(inode->i_mapping); 41660e78d2cSAbhishek Kulkarni 41760e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 41860e78d2cSAbhishek Kulkarni v9fs_cache_inode_put_cookie(inode); 41960e78d2cSAbhishek Kulkarni #endif 4203cf387d7SAneesh Kumar K.V /* clunk the fid stashed in inode->i_private */ 4213cf387d7SAneesh Kumar K.V if (inode->i_private) { 4223cf387d7SAneesh Kumar K.V p9_client_clunk((struct p9_fid *)inode->i_private); 4233cf387d7SAneesh Kumar K.V inode->i_private = NULL; 4243cf387d7SAneesh Kumar K.V } 42560e78d2cSAbhishek Kulkarni } 42660e78d2cSAbhishek Kulkarni 42753c06f4eSAneesh Kumar K.V struct inode * 428f0853122SSripathi Kodi v9fs_inode(struct v9fs_session_info *v9ses, struct p9_fid *fid, 4296a3124a3SLatchesar Ionkov struct super_block *sb) 4306a3124a3SLatchesar Ionkov { 4316a3124a3SLatchesar Ionkov int err, umode; 432f0853122SSripathi Kodi struct inode *ret = NULL; 43351a87c55SEric Van Hensbergen struct p9_wstat *st; 4346a3124a3SLatchesar Ionkov 435bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 43602bc3567SAbhishek Kulkarni if (IS_ERR(st)) 43702bc3567SAbhishek Kulkarni return ERR_CAST(st); 4382bad8471SEric Van Hensbergen 439bd238fb4SLatchesar Ionkov umode = p9mode2unixmode(v9ses, st->mode); 4406a3124a3SLatchesar Ionkov ret = v9fs_get_inode(sb, umode); 4416a3124a3SLatchesar Ionkov if (IS_ERR(ret)) { 4426a3124a3SLatchesar Ionkov err = PTR_ERR(ret); 4436a3124a3SLatchesar Ionkov goto error; 4442bad8471SEric Van Hensbergen } 4452bad8471SEric Van Hensbergen 446bd238fb4SLatchesar Ionkov v9fs_stat2inode(st, ret, sb); 447bd238fb4SLatchesar Ionkov ret->i_ino = v9fs_qid2ino(&st->qid); 44860e78d2cSAbhishek Kulkarni 44960e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 45060e78d2cSAbhishek Kulkarni v9fs_vcookie_set_qid(ret, &st->qid); 45160e78d2cSAbhishek Kulkarni v9fs_cache_inode_get_cookie(ret); 45260e78d2cSAbhishek Kulkarni #endif 45302bc3567SAbhishek Kulkarni p9stat_free(st); 454bd238fb4SLatchesar Ionkov kfree(st); 4556a3124a3SLatchesar Ionkov return ret; 4566a3124a3SLatchesar Ionkov error: 45702bc3567SAbhishek Kulkarni p9stat_free(st); 458bd238fb4SLatchesar Ionkov kfree(st); 4596a3124a3SLatchesar Ionkov return ERR_PTR(err); 4602bad8471SEric Van Hensbergen } 4612bad8471SEric Van Hensbergen 4622bad8471SEric Van Hensbergen /** 4632bad8471SEric Van Hensbergen * v9fs_remove - helper function to remove files and directories 46473c592b9SEric Van Hensbergen * @dir: directory inode that is being deleted 46573c592b9SEric Van Hensbergen * @file: dentry that is being deleted 46673c592b9SEric Van Hensbergen * @rmdir: removing a directory 4672bad8471SEric Van Hensbergen * 4682bad8471SEric Van Hensbergen */ 4692bad8471SEric Van Hensbergen 4702bad8471SEric Van Hensbergen static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) 4712bad8471SEric Van Hensbergen { 472d994f405SAneesh Kumar K.V int retval; 473bd238fb4SLatchesar Ionkov struct inode *file_inode; 474bd238fb4SLatchesar Ionkov struct p9_fid *v9fid; 4752bad8471SEric Van Hensbergen 476bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, 4772bad8471SEric Van Hensbergen rmdir); 4782bad8471SEric Van Hensbergen 4792bad8471SEric Van Hensbergen file_inode = file->d_inode; 480c959df9fSLatchesar Ionkov v9fid = v9fs_fid_clone(file); 481da977b2cSEric Van Hensbergen if (IS_ERR(v9fid)) 482da977b2cSEric Van Hensbergen return PTR_ERR(v9fid); 4832bad8471SEric Van Hensbergen 484d994f405SAneesh Kumar K.V retval = p9_client_remove(v9fid); 485d994f405SAneesh Kumar K.V if (!retval) 486d994f405SAneesh Kumar K.V drop_nlink(file_inode); 487d994f405SAneesh Kumar K.V return retval; 4882bad8471SEric Van Hensbergen } 4892bad8471SEric Van Hensbergen 490bd238fb4SLatchesar Ionkov /** 491bd238fb4SLatchesar Ionkov * v9fs_create - Create a file 492ee443996SEric Van Hensbergen * @v9ses: session information 493ee443996SEric Van Hensbergen * @dir: directory that dentry is being created in 494bd238fb4SLatchesar Ionkov * @dentry: dentry that is being created 4950e15597eSAbhishek Kulkarni * @extension: 9p2000.u extension string to support devices, etc. 496bd238fb4SLatchesar Ionkov * @perm: create permissions 497bd238fb4SLatchesar Ionkov * @mode: open mode 498bd238fb4SLatchesar Ionkov * 499bd238fb4SLatchesar Ionkov */ 500bd238fb4SLatchesar Ionkov static struct p9_fid * 501bd238fb4SLatchesar Ionkov v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 502bd238fb4SLatchesar Ionkov struct dentry *dentry, char *extension, u32 perm, u8 mode) 503bd238fb4SLatchesar Ionkov { 504bd238fb4SLatchesar Ionkov int err; 505bd238fb4SLatchesar Ionkov char *name; 506bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *ofid, *fid; 507bd238fb4SLatchesar Ionkov struct inode *inode; 508bd238fb4SLatchesar Ionkov 50951a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 51051a87c55SEric Van Hensbergen 511bd238fb4SLatchesar Ionkov err = 0; 512bd238fb4SLatchesar Ionkov ofid = NULL; 513bd238fb4SLatchesar Ionkov fid = NULL; 514bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 5156d27e64dSVenkateswararao Jujjuri dfid = v9fs_fid_lookup(dentry->d_parent); 516bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) { 517bd238fb4SLatchesar Ionkov err = PTR_ERR(dfid); 5186d27e64dSVenkateswararao Jujjuri P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 5196d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 520bd238fb4SLatchesar Ionkov } 521bd238fb4SLatchesar Ionkov 522bd238fb4SLatchesar Ionkov /* clone a fid to use for creation */ 523bd238fb4SLatchesar Ionkov ofid = p9_client_walk(dfid, 0, NULL, 1); 524bd238fb4SLatchesar Ionkov if (IS_ERR(ofid)) { 525bd238fb4SLatchesar Ionkov err = PTR_ERR(ofid); 52651a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 5276d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 528bd238fb4SLatchesar Ionkov } 529bd238fb4SLatchesar Ionkov 530bd238fb4SLatchesar Ionkov err = p9_client_fcreate(ofid, name, perm, mode, extension); 53151a87c55SEric Van Hensbergen if (err < 0) { 53251a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 533bd238fb4SLatchesar Ionkov goto error; 53451a87c55SEric Van Hensbergen } 535bd238fb4SLatchesar Ionkov 536bd238fb4SLatchesar Ionkov /* now walk from the parent so we can get unopened fid */ 5376d27e64dSVenkateswararao Jujjuri fid = p9_client_walk(dfid, 1, &name, 1); 538bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 539bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 54051a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 541bd238fb4SLatchesar Ionkov fid = NULL; 542bd238fb4SLatchesar Ionkov goto error; 5436d27e64dSVenkateswararao Jujjuri } 544bd238fb4SLatchesar Ionkov 545bd238fb4SLatchesar Ionkov /* instantiate inode and assign the unopened fid to the dentry */ 546bd238fb4SLatchesar Ionkov inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 547bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 548bd238fb4SLatchesar Ionkov err = PTR_ERR(inode); 54951a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); 550bd238fb4SLatchesar Ionkov goto error; 551bd238fb4SLatchesar Ionkov } 552bd238fb4SLatchesar Ionkov d_instantiate(dentry, inode); 55350fb6d2bSAbhishek Kulkarni err = v9fs_fid_add(dentry, fid); 55450fb6d2bSAbhishek Kulkarni if (err < 0) 55550fb6d2bSAbhishek Kulkarni goto error; 55650fb6d2bSAbhishek Kulkarni 557bd238fb4SLatchesar Ionkov return ofid; 558bd238fb4SLatchesar Ionkov 559bd238fb4SLatchesar Ionkov error: 560bd238fb4SLatchesar Ionkov if (ofid) 561bd238fb4SLatchesar Ionkov p9_client_clunk(ofid); 562bd238fb4SLatchesar Ionkov 563bd238fb4SLatchesar Ionkov if (fid) 564bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 565bd238fb4SLatchesar Ionkov 566bd238fb4SLatchesar Ionkov return ERR_PTR(err); 567bd238fb4SLatchesar Ionkov } 568bd238fb4SLatchesar Ionkov 5692bad8471SEric Van Hensbergen /** 5702bad8471SEric Van Hensbergen * v9fs_vfs_create - VFS hook to create files 571ee443996SEric Van Hensbergen * @dir: directory inode that is being created 5722bad8471SEric Van Hensbergen * @dentry: dentry that is being deleted 5736a3124a3SLatchesar Ionkov * @mode: create permissions 5742bad8471SEric Van Hensbergen * @nd: path information 5752bad8471SEric Van Hensbergen * 5762bad8471SEric Van Hensbergen */ 5772bad8471SEric Van Hensbergen 5782bad8471SEric Van Hensbergen static int 5796a3124a3SLatchesar Ionkov v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 5802bad8471SEric Van Hensbergen struct nameidata *nd) 5812bad8471SEric Van Hensbergen { 5826a3124a3SLatchesar Ionkov int err; 583bd238fb4SLatchesar Ionkov u32 perm; 5846a3124a3SLatchesar Ionkov int flags; 5856a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 5863cf387d7SAneesh Kumar K.V struct p9_fid *fid, *inode_fid; 5876a3124a3SLatchesar Ionkov struct file *filp; 5886a3124a3SLatchesar Ionkov 589bd238fb4SLatchesar Ionkov err = 0; 590bd238fb4SLatchesar Ionkov fid = NULL; 5916a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 592da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 5936a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) 5946a3124a3SLatchesar Ionkov flags = nd->intent.open.flags - 1; 5956a3124a3SLatchesar Ionkov else 5966a3124a3SLatchesar Ionkov flags = O_RDWR; 5976a3124a3SLatchesar Ionkov 598bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 599dd6102fbSSripathi Kodi v9fs_uflags2omode(flags, 600dd6102fbSSripathi Kodi v9fs_proto_dotu(v9ses))); 601bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 602bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 603bd238fb4SLatchesar Ionkov fid = NULL; 6046a3124a3SLatchesar Ionkov goto error; 6056a3124a3SLatchesar Ionkov } 6066a3124a3SLatchesar Ionkov 607bd238fb4SLatchesar Ionkov /* if we are opening a file, assign the open fid to the file */ 6086a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) { 6093cf387d7SAneesh Kumar K.V if (v9ses->cache && !dentry->d_inode->i_private) { 6103cf387d7SAneesh Kumar K.V /* 6113cf387d7SAneesh Kumar K.V * clone a fid and add it to inode->i_private 6123cf387d7SAneesh Kumar K.V * we do it during open time instead of 6133cf387d7SAneesh Kumar K.V * page dirty time via write_begin/page_mkwrite 6143cf387d7SAneesh Kumar K.V * because we want write after unlink usecase 6153cf387d7SAneesh Kumar K.V * to work. 6163cf387d7SAneesh Kumar K.V */ 6173cf387d7SAneesh Kumar K.V inode_fid = v9fs_writeback_fid(dentry); 6183cf387d7SAneesh Kumar K.V if (IS_ERR(inode_fid)) { 6193cf387d7SAneesh Kumar K.V err = PTR_ERR(inode_fid); 6203cf387d7SAneesh Kumar K.V goto error; 6213cf387d7SAneesh Kumar K.V } 6223cf387d7SAneesh Kumar K.V dentry->d_inode->i_private = (void *) inode_fid; 6233cf387d7SAneesh Kumar K.V } 624877cb3d4SAneesh Kumar K.V filp = lookup_instantiate_filp(nd, dentry, generic_file_open); 6256a3124a3SLatchesar Ionkov if (IS_ERR(filp)) { 626bd238fb4SLatchesar Ionkov err = PTR_ERR(filp); 627bd238fb4SLatchesar Ionkov goto error; 6286a3124a3SLatchesar Ionkov } 6296a3124a3SLatchesar Ionkov 630bd238fb4SLatchesar Ionkov filp->private_data = fid; 63146848de0SAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 63246848de0SAneesh Kumar K.V if (v9ses->cache) 63346848de0SAneesh Kumar K.V v9fs_cache_inode_set_cookie(dentry->d_inode, filp); 63446848de0SAneesh Kumar K.V #endif 635bd238fb4SLatchesar Ionkov } else 636bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6376a3124a3SLatchesar Ionkov 6386a3124a3SLatchesar Ionkov return 0; 6396a3124a3SLatchesar Ionkov 6406a3124a3SLatchesar Ionkov error: 641bd238fb4SLatchesar Ionkov if (fid) 642bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6436a3124a3SLatchesar Ionkov 6446a3124a3SLatchesar Ionkov return err; 6452bad8471SEric Van Hensbergen } 6462bad8471SEric Van Hensbergen 6472bad8471SEric Van Hensbergen /** 6482bad8471SEric Van Hensbergen * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 649ee443996SEric Van Hensbergen * @dir: inode that is being unlinked 6502bad8471SEric Van Hensbergen * @dentry: dentry that is being unlinked 6512bad8471SEric Van Hensbergen * @mode: mode for new directory 6522bad8471SEric Van Hensbergen * 6532bad8471SEric Van Hensbergen */ 6542bad8471SEric Van Hensbergen 6556a3124a3SLatchesar Ionkov static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 6562bad8471SEric Van Hensbergen { 6576a3124a3SLatchesar Ionkov int err; 658bd238fb4SLatchesar Ionkov u32 perm; 6596a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 660bd238fb4SLatchesar Ionkov struct p9_fid *fid; 6616a3124a3SLatchesar Ionkov 662bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 663bd238fb4SLatchesar Ionkov err = 0; 6646a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 6656a3124a3SLatchesar Ionkov perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 666bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 667bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 668bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 669bd238fb4SLatchesar Ionkov fid = NULL; 6706a3124a3SLatchesar Ionkov } 6716a3124a3SLatchesar Ionkov 672bd238fb4SLatchesar Ionkov if (fid) 673bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6746a3124a3SLatchesar Ionkov 6756a3124a3SLatchesar Ionkov return err; 6762bad8471SEric Van Hensbergen } 6772bad8471SEric Van Hensbergen 6782bad8471SEric Van Hensbergen /** 6792bad8471SEric Van Hensbergen * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 6802bad8471SEric Van Hensbergen * @dir: inode that is being walked from 6812bad8471SEric Van Hensbergen * @dentry: dentry that is being walked to? 6822bad8471SEric Van Hensbergen * @nameidata: path data 6832bad8471SEric Van Hensbergen * 6842bad8471SEric Van Hensbergen */ 6852bad8471SEric Van Hensbergen 68653c06f4eSAneesh Kumar K.V struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 6872bad8471SEric Van Hensbergen struct nameidata *nameidata) 6882bad8471SEric Van Hensbergen { 6892bad8471SEric Van Hensbergen struct super_block *sb; 6902bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses; 691bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *fid; 6922bad8471SEric Van Hensbergen struct inode *inode; 693bd238fb4SLatchesar Ionkov char *name; 6942bad8471SEric Van Hensbergen int result = 0; 6952bad8471SEric Van Hensbergen 696bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 697731805b4SLatchesar Ionkov dir, dentry->d_name.name, dentry, nameidata); 6982bad8471SEric Van Hensbergen 69911e9b49bSSripathi Kodi if (dentry->d_name.len > NAME_MAX) 70011e9b49bSSripathi Kodi return ERR_PTR(-ENAMETOOLONG); 70111e9b49bSSripathi Kodi 7022bad8471SEric Van Hensbergen sb = dir->i_sb; 7032bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(dir); 704a534c8d1SAneesh Kumar K.V /* We can walk d_parent because we hold the dir->i_mutex */ 705bd238fb4SLatchesar Ionkov dfid = v9fs_fid_lookup(dentry->d_parent); 706bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) 707e231c2eeSDavid Howells return ERR_CAST(dfid); 7082bad8471SEric Van Hensbergen 709bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 710bd238fb4SLatchesar Ionkov fid = p9_client_walk(dfid, 1, &name, 1); 711bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 712bd238fb4SLatchesar Ionkov result = PTR_ERR(fid); 7132bad8471SEric Van Hensbergen if (result == -ENOENT) { 71485e0df24SAneesh Kumar K.V inode = NULL; 71585e0df24SAneesh Kumar K.V goto inst_out; 7162bad8471SEric Van Hensbergen } 7172bad8471SEric Van Hensbergen 718bd238fb4SLatchesar Ionkov return ERR_PTR(result); 7192bad8471SEric Van Hensbergen } 7202bad8471SEric Van Hensbergen 721bd238fb4SLatchesar Ionkov inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 722bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 723bd238fb4SLatchesar Ionkov result = PTR_ERR(inode); 724bd238fb4SLatchesar Ionkov inode = NULL; 725bd238fb4SLatchesar Ionkov goto error; 7262bad8471SEric Van Hensbergen } 7272bad8471SEric Van Hensbergen 728bd238fb4SLatchesar Ionkov result = v9fs_fid_add(dentry, fid); 7296a3124a3SLatchesar Ionkov if (result < 0) 7309856af8bSAneesh Kumar K.V goto error_iput; 7316a3124a3SLatchesar Ionkov 73285e0df24SAneesh Kumar K.V inst_out: 7332bad8471SEric Van Hensbergen d_add(dentry, inode); 7342bad8471SEric Van Hensbergen return NULL; 7352bad8471SEric Van Hensbergen 7369856af8bSAneesh Kumar K.V error_iput: 7379856af8bSAneesh Kumar K.V iput(inode); 738bd238fb4SLatchesar Ionkov error: 739bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 740da977b2cSEric Van Hensbergen 7412bad8471SEric Van Hensbergen return ERR_PTR(result); 7422bad8471SEric Van Hensbergen } 7432bad8471SEric Van Hensbergen 7442bad8471SEric Van Hensbergen /** 7452bad8471SEric Van Hensbergen * v9fs_vfs_unlink - VFS unlink hook to delete an inode 7462bad8471SEric Van Hensbergen * @i: inode that is being unlinked 74773c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7482bad8471SEric Van Hensbergen * 7492bad8471SEric Van Hensbergen */ 7502bad8471SEric Van Hensbergen 75153c06f4eSAneesh Kumar K.V int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 7522bad8471SEric Van Hensbergen { 7532bad8471SEric Van Hensbergen return v9fs_remove(i, d, 0); 7542bad8471SEric Van Hensbergen } 7552bad8471SEric Van Hensbergen 7562bad8471SEric Van Hensbergen /** 7572bad8471SEric Van Hensbergen * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 7582bad8471SEric Van Hensbergen * @i: inode that is being unlinked 75973c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7602bad8471SEric Van Hensbergen * 7612bad8471SEric Van Hensbergen */ 7622bad8471SEric Van Hensbergen 76353c06f4eSAneesh Kumar K.V int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 7642bad8471SEric Van Hensbergen { 7652bad8471SEric Van Hensbergen return v9fs_remove(i, d, 1); 7662bad8471SEric Van Hensbergen } 7672bad8471SEric Van Hensbergen 7682bad8471SEric Van Hensbergen /** 7692bad8471SEric Van Hensbergen * v9fs_vfs_rename - VFS hook to rename an inode 7702bad8471SEric Van Hensbergen * @old_dir: old dir inode 7712bad8471SEric Van Hensbergen * @old_dentry: old dentry 7722bad8471SEric Van Hensbergen * @new_dir: new dir inode 7732bad8471SEric Van Hensbergen * @new_dentry: new dentry 7742bad8471SEric Van Hensbergen * 7752bad8471SEric Van Hensbergen */ 7762bad8471SEric Van Hensbergen 77753c06f4eSAneesh Kumar K.V int 7782bad8471SEric Van Hensbergen v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 7792bad8471SEric Van Hensbergen struct inode *new_dir, struct dentry *new_dentry) 7802bad8471SEric Van Hensbergen { 781bd238fb4SLatchesar Ionkov struct inode *old_inode; 782bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 783bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 784bd238fb4SLatchesar Ionkov struct p9_fid *olddirfid; 785bd238fb4SLatchesar Ionkov struct p9_fid *newdirfid; 786bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 787bd238fb4SLatchesar Ionkov int retval; 7882bad8471SEric Van Hensbergen 789bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 790bd238fb4SLatchesar Ionkov retval = 0; 791bd238fb4SLatchesar Ionkov old_inode = old_dentry->d_inode; 792bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(old_inode); 793bd238fb4SLatchesar Ionkov oldfid = v9fs_fid_lookup(old_dentry); 794da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 795da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 796da977b2cSEric Van Hensbergen 797da977b2cSEric Van Hensbergen olddirfid = v9fs_fid_clone(old_dentry->d_parent); 798da977b2cSEric Van Hensbergen if (IS_ERR(olddirfid)) { 799da977b2cSEric Van Hensbergen retval = PTR_ERR(olddirfid); 800bd238fb4SLatchesar Ionkov goto done; 801da977b2cSEric Van Hensbergen } 802da977b2cSEric Van Hensbergen 803da977b2cSEric Van Hensbergen newdirfid = v9fs_fid_clone(new_dentry->d_parent); 804da977b2cSEric Van Hensbergen if (IS_ERR(newdirfid)) { 805da977b2cSEric Van Hensbergen retval = PTR_ERR(newdirfid); 806bd238fb4SLatchesar Ionkov goto clunk_olddir; 8072bad8471SEric Van Hensbergen } 8082bad8471SEric Van Hensbergen 809a534c8d1SAneesh Kumar K.V down_write(&v9ses->rename_sem); 8104681dbdaSSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 8114681dbdaSSripathi Kodi retval = p9_client_rename(oldfid, newdirfid, 8124681dbdaSSripathi Kodi (char *) new_dentry->d_name.name); 8134681dbdaSSripathi Kodi if (retval != -ENOSYS) 8144681dbdaSSripathi Kodi goto clunk_newdir; 8154681dbdaSSripathi Kodi } 816a534c8d1SAneesh Kumar K.V if (old_dentry->d_parent != new_dentry->d_parent) { 817a534c8d1SAneesh Kumar K.V /* 818a534c8d1SAneesh Kumar K.V * 9P .u can only handle file rename in the same directory 819a534c8d1SAneesh Kumar K.V */ 8204681dbdaSSripathi Kodi 821bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 822bd238fb4SLatchesar Ionkov "old dir and new dir are different\n"); 823621997cdSEric Van Hensbergen retval = -EXDEV; 824bd238fb4SLatchesar Ionkov goto clunk_newdir; 8252bad8471SEric Van Hensbergen } 826531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 827ba17674fSLatchesar Ionkov wstat.muid = v9ses->uname; 828531b1094SLatchesar Ionkov wstat.name = (char *) new_dentry->d_name.name; 829bd238fb4SLatchesar Ionkov retval = p9_client_wstat(oldfid, &wstat); 8302bad8471SEric Van Hensbergen 831bd238fb4SLatchesar Ionkov clunk_newdir: 832a534c8d1SAneesh Kumar K.V if (!retval) 833a534c8d1SAneesh Kumar K.V /* successful rename */ 834a534c8d1SAneesh Kumar K.V d_move(old_dentry, new_dentry); 835a534c8d1SAneesh Kumar K.V up_write(&v9ses->rename_sem); 83622150c4fSLatchesar Ionkov p9_client_clunk(newdirfid); 8372bad8471SEric Van Hensbergen 838bd238fb4SLatchesar Ionkov clunk_olddir: 83922150c4fSLatchesar Ionkov p9_client_clunk(olddirfid); 8402bad8471SEric Van Hensbergen 841bd238fb4SLatchesar Ionkov done: 8422bad8471SEric Van Hensbergen return retval; 8432bad8471SEric Van Hensbergen } 8442bad8471SEric Van Hensbergen 8452bad8471SEric Van Hensbergen /** 846943ffb58SAdrian Bunk * v9fs_vfs_getattr - retrieve file metadata 847ee443996SEric Van Hensbergen * @mnt: mount information 848ee443996SEric Van Hensbergen * @dentry: file to get attributes on 849ee443996SEric Van Hensbergen * @stat: metadata structure to populate 8502bad8471SEric Van Hensbergen * 8512bad8471SEric Van Hensbergen */ 8522bad8471SEric Van Hensbergen 8532bad8471SEric Van Hensbergen static int 8542bad8471SEric Van Hensbergen v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 8552bad8471SEric Van Hensbergen struct kstat *stat) 8562bad8471SEric Van Hensbergen { 857bd238fb4SLatchesar Ionkov int err; 858bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 859bd238fb4SLatchesar Ionkov struct p9_fid *fid; 86051a87c55SEric Van Hensbergen struct p9_wstat *st; 8612bad8471SEric Van Hensbergen 862bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); 863bd238fb4SLatchesar Ionkov err = -EPERM; 864bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 86560e78d2cSAbhishek Kulkarni if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 8669523a841SEric Van Hensbergen return simple_getattr(mnt, dentry, stat); 8679523a841SEric Van Hensbergen 868bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 869da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 870da977b2cSEric Van Hensbergen return PTR_ERR(fid); 8712bad8471SEric Van Hensbergen 872bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 873bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 874bd238fb4SLatchesar Ionkov return PTR_ERR(st); 8752bad8471SEric Van Hensbergen 876bd238fb4SLatchesar Ionkov v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 8772bad8471SEric Van Hensbergen generic_fillattr(dentry->d_inode, stat); 8782bad8471SEric Van Hensbergen 87962b2be59SLatchesar Ionkov p9stat_free(st); 880bd238fb4SLatchesar Ionkov kfree(st); 881bd238fb4SLatchesar Ionkov return 0; 8822bad8471SEric Van Hensbergen } 8832bad8471SEric Van Hensbergen 8842bad8471SEric Van Hensbergen /** 8852bad8471SEric Van Hensbergen * v9fs_vfs_setattr - set file metadata 8862bad8471SEric Van Hensbergen * @dentry: file whose metadata to set 8872bad8471SEric Van Hensbergen * @iattr: metadata assignment structure 8882bad8471SEric Van Hensbergen * 8892bad8471SEric Van Hensbergen */ 8902bad8471SEric Van Hensbergen 8912bad8471SEric Van Hensbergen static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 8922bad8471SEric Van Hensbergen { 893bd238fb4SLatchesar Ionkov int retval; 894bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 895bd238fb4SLatchesar Ionkov struct p9_fid *fid; 896bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 8972bad8471SEric Van Hensbergen 898bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 899bd238fb4SLatchesar Ionkov retval = -EPERM; 900bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 901bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 902da977b2cSEric Van Hensbergen if(IS_ERR(fid)) 903da977b2cSEric Van Hensbergen return PTR_ERR(fid); 9042bad8471SEric Van Hensbergen 905531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 9062bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MODE) 907531b1094SLatchesar Ionkov wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 9082bad8471SEric Van Hensbergen 9092bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MTIME) 910531b1094SLatchesar Ionkov wstat.mtime = iattr->ia_mtime.tv_sec; 9112bad8471SEric Van Hensbergen 9122bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_ATIME) 913531b1094SLatchesar Ionkov wstat.atime = iattr->ia_atime.tv_sec; 9142bad8471SEric Van Hensbergen 9152bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_SIZE) 916531b1094SLatchesar Ionkov wstat.length = iattr->ia_size; 9172bad8471SEric Van Hensbergen 918dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 919531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_UID) 920531b1094SLatchesar Ionkov wstat.n_uid = iattr->ia_uid; 9212bad8471SEric Van Hensbergen 922531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_GID) 923531b1094SLatchesar Ionkov wstat.n_gid = iattr->ia_gid; 9242bad8471SEric Van Hensbergen } 9252bad8471SEric Van Hensbergen 926bd238fb4SLatchesar Ionkov retval = p9_client_wstat(fid, &wstat); 9271025774cSChristoph Hellwig if (retval < 0) 928bd238fb4SLatchesar Ionkov return retval; 9291025774cSChristoph Hellwig 9301025774cSChristoph Hellwig if ((iattr->ia_valid & ATTR_SIZE) && 9311025774cSChristoph Hellwig iattr->ia_size != i_size_read(dentry->d_inode)) { 9321025774cSChristoph Hellwig retval = vmtruncate(dentry->d_inode, iattr->ia_size); 9331025774cSChristoph Hellwig if (retval) 9341025774cSChristoph Hellwig return retval; 9351025774cSChristoph Hellwig } 9361025774cSChristoph Hellwig 9371025774cSChristoph Hellwig setattr_copy(dentry->d_inode, iattr); 9381025774cSChristoph Hellwig mark_inode_dirty(dentry->d_inode); 9391025774cSChristoph Hellwig return 0; 9402bad8471SEric Van Hensbergen } 9412bad8471SEric Van Hensbergen 9422bad8471SEric Van Hensbergen /** 943531b1094SLatchesar Ionkov * v9fs_stat2inode - populate an inode structure with mistat info 944531b1094SLatchesar Ionkov * @stat: Plan 9 metadata (mistat) structure 9452bad8471SEric Van Hensbergen * @inode: inode to populate 9462bad8471SEric Van Hensbergen * @sb: superblock of filesystem 9472bad8471SEric Van Hensbergen * 9482bad8471SEric Van Hensbergen */ 9492bad8471SEric Van Hensbergen 9502bad8471SEric Van Hensbergen void 95151a87c55SEric Van Hensbergen v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 9522bad8471SEric Van Hensbergen struct super_block *sb) 9532bad8471SEric Van Hensbergen { 954531b1094SLatchesar Ionkov char ext[32]; 9555717144aSAneesh Kumar K.V char tag_name[14]; 9565717144aSAneesh Kumar K.V unsigned int i_nlink; 9572bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 9582bad8471SEric Van Hensbergen 9592bad8471SEric Van Hensbergen inode->i_nlink = 1; 9602bad8471SEric Van Hensbergen 961531b1094SLatchesar Ionkov inode->i_atime.tv_sec = stat->atime; 962531b1094SLatchesar Ionkov inode->i_mtime.tv_sec = stat->mtime; 963531b1094SLatchesar Ionkov inode->i_ctime.tv_sec = stat->mtime; 9642bad8471SEric Van Hensbergen 965bd32b82dSLatchesar Ionkov inode->i_uid = v9ses->dfltuid; 966bd32b82dSLatchesar Ionkov inode->i_gid = v9ses->dfltgid; 9672bad8471SEric Van Hensbergen 968dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 969531b1094SLatchesar Ionkov inode->i_uid = stat->n_uid; 970531b1094SLatchesar Ionkov inode->i_gid = stat->n_gid; 971531b1094SLatchesar Ionkov } 9725717144aSAneesh Kumar K.V if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 9735717144aSAneesh Kumar K.V if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 9745717144aSAneesh Kumar K.V /* 9755717144aSAneesh Kumar K.V * Hadlink support got added later to 9765717144aSAneesh Kumar K.V * to the .u extension. So there can be 9775717144aSAneesh Kumar K.V * server out there that doesn't support 9785717144aSAneesh Kumar K.V * this even with .u extension. So check 9795717144aSAneesh Kumar K.V * for non NULL stat->extension 9805717144aSAneesh Kumar K.V */ 9815717144aSAneesh Kumar K.V strncpy(ext, stat->extension, sizeof(ext)); 9825717144aSAneesh Kumar K.V /* HARDLINKCOUNT %u */ 9835717144aSAneesh Kumar K.V sscanf(ext, "%13s %u", tag_name, &i_nlink); 9845717144aSAneesh Kumar K.V if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 9855717144aSAneesh Kumar K.V inode->i_nlink = i_nlink; 9865717144aSAneesh Kumar K.V } 9875717144aSAneesh Kumar K.V } 988531b1094SLatchesar Ionkov inode->i_mode = p9mode2unixmode(v9ses, stat->mode); 9892bad8471SEric Van Hensbergen if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 9902bad8471SEric Van Hensbergen char type = 0; 9912bad8471SEric Van Hensbergen int major = -1; 9922bad8471SEric Van Hensbergen int minor = -1; 993531b1094SLatchesar Ionkov 99451a87c55SEric Van Hensbergen strncpy(ext, stat->extension, sizeof(ext)); 995531b1094SLatchesar Ionkov sscanf(ext, "%c %u %u", &type, &major, &minor); 9962bad8471SEric Van Hensbergen switch (type) { 9972bad8471SEric Van Hensbergen case 'c': 9982bad8471SEric Van Hensbergen inode->i_mode &= ~S_IFBLK; 9992bad8471SEric Van Hensbergen inode->i_mode |= S_IFCHR; 10002bad8471SEric Van Hensbergen break; 10012bad8471SEric Van Hensbergen case 'b': 10022bad8471SEric Van Hensbergen break; 10032bad8471SEric Van Hensbergen default: 1004bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 100551a87c55SEric Van Hensbergen "Unknown special type %c %s\n", type, 100651a87c55SEric Van Hensbergen stat->extension); 10072bad8471SEric Van Hensbergen }; 10082bad8471SEric Van Hensbergen inode->i_rdev = MKDEV(major, minor); 100957c7b4e6SMagnus Deininger init_special_inode(inode, inode->i_mode, inode->i_rdev); 10102bad8471SEric Van Hensbergen } else 10112bad8471SEric Van Hensbergen inode->i_rdev = 0; 10122bad8471SEric Van Hensbergen 10137549ae3eSAbhishek Kulkarni i_size_write(inode, stat->length); 10142bad8471SEric Van Hensbergen 1015bd238fb4SLatchesar Ionkov /* not real number of blocks, but 512 byte ones ... */ 10167549ae3eSAbhishek Kulkarni inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 10172bad8471SEric Van Hensbergen } 10182bad8471SEric Van Hensbergen 10192bad8471SEric Van Hensbergen /** 10202bad8471SEric Van Hensbergen * v9fs_qid2ino - convert qid into inode number 10212bad8471SEric Van Hensbergen * @qid: qid to hash 10222bad8471SEric Van Hensbergen * 10232bad8471SEric Van Hensbergen * BUG: potential for inode number collisions? 10242bad8471SEric Van Hensbergen */ 10252bad8471SEric Van Hensbergen 1026bd238fb4SLatchesar Ionkov ino_t v9fs_qid2ino(struct p9_qid *qid) 10272bad8471SEric Van Hensbergen { 10282bad8471SEric Van Hensbergen u64 path = qid->path + 2; 10292bad8471SEric Van Hensbergen ino_t i = 0; 10302bad8471SEric Van Hensbergen 10312bad8471SEric Van Hensbergen if (sizeof(ino_t) == sizeof(path)) 10322bad8471SEric Van Hensbergen memcpy(&i, &path, sizeof(ino_t)); 10332bad8471SEric Van Hensbergen else 10342bad8471SEric Van Hensbergen i = (ino_t) (path ^ (path >> 32)); 10352bad8471SEric Van Hensbergen 10362bad8471SEric Van Hensbergen return i; 10372bad8471SEric Van Hensbergen } 10382bad8471SEric Van Hensbergen 10392bad8471SEric Van Hensbergen /** 10402bad8471SEric Van Hensbergen * v9fs_readlink - read a symlink's location (internal version) 10412bad8471SEric Van Hensbergen * @dentry: dentry for symlink 104273c592b9SEric Van Hensbergen * @buffer: buffer to load symlink location into 10432bad8471SEric Van Hensbergen * @buflen: length of buffer 10442bad8471SEric Van Hensbergen * 10452bad8471SEric Van Hensbergen */ 10462bad8471SEric Van Hensbergen 10472bad8471SEric Van Hensbergen static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 10482bad8471SEric Van Hensbergen { 1049bd238fb4SLatchesar Ionkov int retval; 10502bad8471SEric Van Hensbergen 1051bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1052bd238fb4SLatchesar Ionkov struct p9_fid *fid; 105351a87c55SEric Van Hensbergen struct p9_wstat *st; 10542bad8471SEric Van Hensbergen 1055bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 1056bd238fb4SLatchesar Ionkov retval = -EPERM; 1057bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 1058bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1059da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 1060da977b2cSEric Van Hensbergen return PTR_ERR(fid); 10612bad8471SEric Van Hensbergen 1062329176ccSM. Mohan Kumar if (!v9fs_proto_dotu(v9ses)) 1063bd238fb4SLatchesar Ionkov return -EBADF; 10642bad8471SEric Van Hensbergen 1065bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 1066bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 1067bd238fb4SLatchesar Ionkov return PTR_ERR(st); 10682bad8471SEric Van Hensbergen 1069bd238fb4SLatchesar Ionkov if (!(st->mode & P9_DMSYMLINK)) { 10702bad8471SEric Van Hensbergen retval = -EINVAL; 1071bd238fb4SLatchesar Ionkov goto done; 10722bad8471SEric Van Hensbergen } 10732bad8471SEric Van Hensbergen 10742bad8471SEric Van Hensbergen /* copy extension buffer into buffer */ 107551a87c55SEric Van Hensbergen strncpy(buffer, st->extension, buflen); 10762bad8471SEric Van Hensbergen 1077bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 107851a87c55SEric Van Hensbergen "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); 1079bd238fb4SLatchesar Ionkov 10802511cd0bSMartin Stava retval = strnlen(buffer, buflen); 1081bd238fb4SLatchesar Ionkov done: 108262b2be59SLatchesar Ionkov p9stat_free(st); 1083bd238fb4SLatchesar Ionkov kfree(st); 10842bad8471SEric Van Hensbergen return retval; 10852bad8471SEric Van Hensbergen } 10862bad8471SEric Van Hensbergen 10872bad8471SEric Van Hensbergen /** 10882bad8471SEric Van Hensbergen * v9fs_vfs_follow_link - follow a symlink path 10892bad8471SEric Van Hensbergen * @dentry: dentry for symlink 10902bad8471SEric Van Hensbergen * @nd: nameidata 10912bad8471SEric Van Hensbergen * 10922bad8471SEric Van Hensbergen */ 10932bad8471SEric Van Hensbergen 10942bad8471SEric Van Hensbergen static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 10952bad8471SEric Van Hensbergen { 10962bad8471SEric Van Hensbergen int len = 0; 10972bad8471SEric Van Hensbergen char *link = __getname(); 10982bad8471SEric Van Hensbergen 1099bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); 11002bad8471SEric Van Hensbergen 11012bad8471SEric Van Hensbergen if (!link) 11022bad8471SEric Van Hensbergen link = ERR_PTR(-ENOMEM); 11032bad8471SEric Van Hensbergen else { 110416cce6d2SLatchesar Ionkov len = v9fs_readlink(dentry, link, PATH_MAX); 11052bad8471SEric Van Hensbergen 11062bad8471SEric Van Hensbergen if (len < 0) { 1107ce44eeb6SDavi Arnaut __putname(link); 11082bad8471SEric Van Hensbergen link = ERR_PTR(len); 11092bad8471SEric Van Hensbergen } else 11102511cd0bSMartin Stava link[min(len, PATH_MAX-1)] = 0; 11112bad8471SEric Van Hensbergen } 11122bad8471SEric Van Hensbergen nd_set_link(nd, link); 11132bad8471SEric Van Hensbergen 11142bad8471SEric Van Hensbergen return NULL; 11152bad8471SEric Van Hensbergen } 11162bad8471SEric Van Hensbergen 11172bad8471SEric Van Hensbergen /** 11182bad8471SEric Van Hensbergen * v9fs_vfs_put_link - release a symlink path 11192bad8471SEric Van Hensbergen * @dentry: dentry for symlink 11202bad8471SEric Van Hensbergen * @nd: nameidata 1121ee443996SEric Van Hensbergen * @p: unused 11222bad8471SEric Van Hensbergen * 11232bad8471SEric Van Hensbergen */ 11242bad8471SEric Van Hensbergen 112553c06f4eSAneesh Kumar K.V void 1126ee443996SEric Van Hensbergen v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 11272bad8471SEric Van Hensbergen { 11282bad8471SEric Van Hensbergen char *s = nd_get_link(nd); 11292bad8471SEric Van Hensbergen 11306ff23207SDuane Griffin P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, 11316ff23207SDuane Griffin IS_ERR(s) ? "<error>" : s); 11322bad8471SEric Van Hensbergen if (!IS_ERR(s)) 1133ce44eeb6SDavi Arnaut __putname(s); 11342bad8471SEric Van Hensbergen } 11352bad8471SEric Van Hensbergen 1136ee443996SEric Van Hensbergen /** 1137ee443996SEric Van Hensbergen * v9fs_vfs_mkspecial - create a special file 1138ee443996SEric Van Hensbergen * @dir: inode to create special file in 1139ee443996SEric Van Hensbergen * @dentry: dentry to create 1140ee443996SEric Van Hensbergen * @mode: mode to create special file 1141ee443996SEric Van Hensbergen * @extension: 9p2000.u format extension string representing special file 1142ee443996SEric Van Hensbergen * 1143ee443996SEric Van Hensbergen */ 1144ee443996SEric Van Hensbergen 1145531b1094SLatchesar Ionkov static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1146531b1094SLatchesar Ionkov int mode, const char *extension) 1147531b1094SLatchesar Ionkov { 1148bd238fb4SLatchesar Ionkov u32 perm; 1149531b1094SLatchesar Ionkov struct v9fs_session_info *v9ses; 1150bd238fb4SLatchesar Ionkov struct p9_fid *fid; 1151531b1094SLatchesar Ionkov 11526a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 1153dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) { 1154bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); 11556a3124a3SLatchesar Ionkov return -EPERM; 1156531b1094SLatchesar Ionkov } 1157531b1094SLatchesar Ionkov 1158da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 1159bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1160bd238fb4SLatchesar Ionkov P9_OREAD); 1161bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) 1162bd238fb4SLatchesar Ionkov return PTR_ERR(fid); 1163da977b2cSEric Van Hensbergen 1164bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 11656a3124a3SLatchesar Ionkov return 0; 1166531b1094SLatchesar Ionkov } 1167531b1094SLatchesar Ionkov 1168531b1094SLatchesar Ionkov /** 1169531b1094SLatchesar Ionkov * v9fs_vfs_symlink - helper function to create symlinks 1170531b1094SLatchesar Ionkov * @dir: directory inode containing symlink 1171531b1094SLatchesar Ionkov * @dentry: dentry for symlink 1172531b1094SLatchesar Ionkov * @symname: symlink data 1173531b1094SLatchesar Ionkov * 1174ee443996SEric Van Hensbergen * See Also: 9P2000.u RFC for more information 1175531b1094SLatchesar Ionkov * 1176531b1094SLatchesar Ionkov */ 1177531b1094SLatchesar Ionkov 1178531b1094SLatchesar Ionkov static int 1179531b1094SLatchesar Ionkov v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1180531b1094SLatchesar Ionkov { 1181bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, 1182bd238fb4SLatchesar Ionkov dentry->d_name.name, symname); 1183531b1094SLatchesar Ionkov 1184531b1094SLatchesar Ionkov return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1185531b1094SLatchesar Ionkov } 1186531b1094SLatchesar Ionkov 11872bad8471SEric Van Hensbergen /** 11882bad8471SEric Van Hensbergen * v9fs_vfs_link - create a hardlink 11892bad8471SEric Van Hensbergen * @old_dentry: dentry for file to link to 11902bad8471SEric Van Hensbergen * @dir: inode destination for new link 119173c592b9SEric Van Hensbergen * @dentry: dentry for link 11922bad8471SEric Van Hensbergen * 11932bad8471SEric Van Hensbergen */ 11942bad8471SEric Van Hensbergen 11952bad8471SEric Van Hensbergen static int 11962bad8471SEric Van Hensbergen v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 11972bad8471SEric Van Hensbergen struct dentry *dentry) 11982bad8471SEric Van Hensbergen { 1199531b1094SLatchesar Ionkov int retval; 1200bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 1201531b1094SLatchesar Ionkov char *name; 12022bad8471SEric Van Hensbergen 1203bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1204bd238fb4SLatchesar Ionkov " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 12052bad8471SEric Van Hensbergen old_dentry->d_name.name); 12062bad8471SEric Van Hensbergen 1207da977b2cSEric Van Hensbergen oldfid = v9fs_fid_clone(old_dentry); 1208da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 1209da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 12102bad8471SEric Van Hensbergen 1211531b1094SLatchesar Ionkov name = __getname(); 1212da977b2cSEric Van Hensbergen if (unlikely(!name)) { 1213da977b2cSEric Van Hensbergen retval = -ENOMEM; 1214da977b2cSEric Van Hensbergen goto clunk_fid; 1215da977b2cSEric Van Hensbergen } 12160710d36aSFlorin Malita 121716cce6d2SLatchesar Ionkov sprintf(name, "%d\n", oldfid->fid); 1218bd238fb4SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1219531b1094SLatchesar Ionkov __putname(name); 12202bad8471SEric Van Hensbergen 1221da977b2cSEric Van Hensbergen clunk_fid: 1222bd238fb4SLatchesar Ionkov p9_client_clunk(oldfid); 12232bad8471SEric Van Hensbergen return retval; 12242bad8471SEric Van Hensbergen } 12252bad8471SEric Van Hensbergen 12262bad8471SEric Van Hensbergen /** 12272bad8471SEric Van Hensbergen * v9fs_vfs_mknod - create a special file 12282bad8471SEric Van Hensbergen * @dir: inode destination for new link 12292bad8471SEric Van Hensbergen * @dentry: dentry for file 12302bad8471SEric Van Hensbergen * @mode: mode for creation 1231ee443996SEric Van Hensbergen * @rdev: device associated with special file 12322bad8471SEric Van Hensbergen * 12332bad8471SEric Van Hensbergen */ 12342bad8471SEric Van Hensbergen 12352bad8471SEric Van Hensbergen static int 12362bad8471SEric Van Hensbergen v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 12372bad8471SEric Van Hensbergen { 1238531b1094SLatchesar Ionkov int retval; 1239531b1094SLatchesar Ionkov char *name; 12402bad8471SEric Van Hensbergen 1241bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1242bd238fb4SLatchesar Ionkov " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 12432bad8471SEric Van Hensbergen dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 12442bad8471SEric Van Hensbergen 1245531b1094SLatchesar Ionkov if (!new_valid_dev(rdev)) 1246531b1094SLatchesar Ionkov return -EINVAL; 124773c592b9SEric Van Hensbergen 1248531b1094SLatchesar Ionkov name = __getname(); 1249c0291a05SEugene Teo if (!name) 1250c0291a05SEugene Teo return -ENOMEM; 12512bad8471SEric Van Hensbergen /* build extension */ 12522bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 1253531b1094SLatchesar Ionkov sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 12542bad8471SEric Van Hensbergen else if (S_ISCHR(mode)) 1255531b1094SLatchesar Ionkov sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 125673c592b9SEric Van Hensbergen else if (S_ISFIFO(mode)) 1257531b1094SLatchesar Ionkov *name = 0; 125875cc5c9bSVenkateswararao Jujjuri else if (S_ISSOCK(mode)) 125975cc5c9bSVenkateswararao Jujjuri *name = 0; 12602bad8471SEric Van Hensbergen else { 1261531b1094SLatchesar Ionkov __putname(name); 1262531b1094SLatchesar Ionkov return -EINVAL; 12632bad8471SEric Van Hensbergen } 12642bad8471SEric Van Hensbergen 1265531b1094SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1266531b1094SLatchesar Ionkov __putname(name); 12672bad8471SEric Van Hensbergen 12682bad8471SEric Van Hensbergen return retval; 12692bad8471SEric Van Hensbergen } 12702bad8471SEric Van Hensbergen 12719b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotu = { 12729b6533c9SSripathi Kodi .create = v9fs_vfs_create, 12739b6533c9SSripathi Kodi .lookup = v9fs_vfs_lookup, 12749b6533c9SSripathi Kodi .symlink = v9fs_vfs_symlink, 127550cc42ffSVenkateswararao Jujjuri (JV) .link = v9fs_vfs_link, 12769b6533c9SSripathi Kodi .unlink = v9fs_vfs_unlink, 12779b6533c9SSripathi Kodi .mkdir = v9fs_vfs_mkdir, 12789b6533c9SSripathi Kodi .rmdir = v9fs_vfs_rmdir, 12791d76e313SAneesh Kumar K.V .mknod = v9fs_vfs_mknod, 12809b6533c9SSripathi Kodi .rename = v9fs_vfs_rename, 12819b6533c9SSripathi Kodi .getattr = v9fs_vfs_getattr, 12829b6533c9SSripathi Kodi .setattr = v9fs_vfs_setattr, 12839b6533c9SSripathi Kodi }; 12849b6533c9SSripathi Kodi 1285754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations = { 1286b501611aSEric Van Hensbergen .create = v9fs_vfs_create, 1287b501611aSEric Van Hensbergen .lookup = v9fs_vfs_lookup, 1288b501611aSEric Van Hensbergen .unlink = v9fs_vfs_unlink, 1289b501611aSEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 1290b501611aSEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 1291b501611aSEric Van Hensbergen .mknod = v9fs_vfs_mknod, 1292b501611aSEric Van Hensbergen .rename = v9fs_vfs_rename, 1293b501611aSEric Van Hensbergen .getattr = v9fs_vfs_getattr, 1294b501611aSEric Van Hensbergen .setattr = v9fs_vfs_setattr, 1295b501611aSEric Van Hensbergen }; 1296b501611aSEric Van Hensbergen 1297754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations = { 12982bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 12992bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 13002bad8471SEric Van Hensbergen }; 13012bad8471SEric Van Hensbergen 1302754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations = { 1303204f2f0eSAl Viro .readlink = generic_readlink, 13042bad8471SEric Van Hensbergen .follow_link = v9fs_vfs_follow_link, 13052bad8471SEric Van Hensbergen .put_link = v9fs_vfs_put_link, 13062bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 13072bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 13082bad8471SEric Van Hensbergen }; 13099b6533c9SSripathi Kodi 1310