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; 2959b6533c9SSripathi Kodi inode->i_fop = &v9fs_file_operations_dotl; 2969b6533c9SSripathi Kodi } else { 2972bad8471SEric Van Hensbergen inode->i_op = &v9fs_file_inode_operations; 2982bad8471SEric Van Hensbergen inode->i_fop = &v9fs_file_operations; 2999b6533c9SSripathi Kodi } 3009b6533c9SSripathi Kodi 3012bad8471SEric Van Hensbergen break; 3029b6533c9SSripathi Kodi 303b501611aSEric Van Hensbergen case S_IFLNK: 3049b6533c9SSripathi Kodi if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 3059b6533c9SSripathi Kodi P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " 3069b6533c9SSripathi Kodi "legacy protocol.\n"); 3072bb54115SAbhishek Kulkarni err = -EINVAL; 3082bb54115SAbhishek Kulkarni goto error; 309b501611aSEric Van Hensbergen } 3109b6533c9SSripathi Kodi 3119b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3129b6533c9SSripathi Kodi inode->i_op = &v9fs_symlink_inode_operations_dotl; 3139b6533c9SSripathi Kodi else 314b501611aSEric Van Hensbergen inode->i_op = &v9fs_symlink_inode_operations; 3159b6533c9SSripathi Kodi 316b501611aSEric Van Hensbergen break; 3172bad8471SEric Van Hensbergen case S_IFDIR: 318d8c76e6fSDave Hansen inc_nlink(inode); 3199b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3209b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotl; 3219b6533c9SSripathi Kodi else if (v9fs_proto_dotu(v9ses)) 3229b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotu; 323b501611aSEric Van Hensbergen else 3242bad8471SEric Van Hensbergen inode->i_op = &v9fs_dir_inode_operations; 3259b6533c9SSripathi Kodi 3269b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3279b6533c9SSripathi Kodi inode->i_fop = &v9fs_dir_operations_dotl; 3289b6533c9SSripathi Kodi else 3292bad8471SEric Van Hensbergen inode->i_fop = &v9fs_dir_operations; 3309b6533c9SSripathi Kodi 3312bad8471SEric Van Hensbergen break; 3322bad8471SEric Van Hensbergen default: 3332bb54115SAbhishek Kulkarni P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 3342bad8471SEric Van Hensbergen mode, mode & S_IFMT); 3352bb54115SAbhishek Kulkarni err = -EINVAL; 3362bb54115SAbhishek Kulkarni goto error; 3372bad8471SEric Van Hensbergen } 3382bb54115SAbhishek Kulkarni 3392bad8471SEric Van Hensbergen return inode; 3402bb54115SAbhishek Kulkarni 3412bb54115SAbhishek Kulkarni error: 3422bb54115SAbhishek Kulkarni iput(inode); 3432bb54115SAbhishek Kulkarni return ERR_PTR(err); 3442bad8471SEric Van Hensbergen } 3452bad8471SEric Van Hensbergen 346bd238fb4SLatchesar Ionkov /* 3476a3124a3SLatchesar Ionkov static struct v9fs_fid* 3486a3124a3SLatchesar Ionkov v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 3496a3124a3SLatchesar Ionkov { 3506a3124a3SLatchesar Ionkov int err; 351736c4b85SMika Kukkonen int nfid; 3526a3124a3SLatchesar Ionkov struct v9fs_fid *ret; 3536a3124a3SLatchesar Ionkov struct v9fs_fcall *fcall; 3540b8dd177SLatchesar Ionkov 3556a3124a3SLatchesar Ionkov nfid = v9fs_get_idpool(&v9ses->fidpool); 3566a3124a3SLatchesar Ionkov if (nfid < 0) { 3570b8dd177SLatchesar Ionkov eprintk(KERN_WARNING, "no free fids available\n"); 358731805b4SLatchesar Ionkov return ERR_PTR(-ENOSPC); 3590b8dd177SLatchesar Ionkov } 3600b8dd177SLatchesar Ionkov 3616a3124a3SLatchesar Ionkov err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 3626a3124a3SLatchesar Ionkov &fcall); 3636a3124a3SLatchesar Ionkov 3646a3124a3SLatchesar Ionkov if (err < 0) { 36541e5a6acSLatchesar Ionkov if (fcall && fcall->id == RWALK) 36641e5a6acSLatchesar Ionkov goto clunk_fid; 36741e5a6acSLatchesar Ionkov 3686a3124a3SLatchesar Ionkov PRINT_FCALL_ERROR("walk error", fcall); 3696a3124a3SLatchesar Ionkov v9fs_put_idpool(nfid, &v9ses->fidpool); 3706a3124a3SLatchesar Ionkov goto error; 3710b8dd177SLatchesar Ionkov } 3726a3124a3SLatchesar Ionkov 3733cf6429aSLatchesar Ionkov kfree(fcall); 3743cf6429aSLatchesar Ionkov fcall = NULL; 3756a3124a3SLatchesar Ionkov ret = v9fs_fid_create(v9ses, nfid); 3766a3124a3SLatchesar Ionkov if (!ret) { 3776a3124a3SLatchesar Ionkov err = -ENOMEM; 3786a3124a3SLatchesar Ionkov goto clunk_fid; 3790b8dd177SLatchesar Ionkov } 3802bad8471SEric Van Hensbergen 3816a3124a3SLatchesar Ionkov err = v9fs_fid_insert(ret, dentry); 3826a3124a3SLatchesar Ionkov if (err < 0) { 3836a3124a3SLatchesar Ionkov v9fs_fid_destroy(ret); 3846a3124a3SLatchesar Ionkov goto clunk_fid; 3856a3124a3SLatchesar Ionkov } 3862bad8471SEric Van Hensbergen 3876a3124a3SLatchesar Ionkov return ret; 3886a3124a3SLatchesar Ionkov 3896a3124a3SLatchesar Ionkov clunk_fid: 3906a3124a3SLatchesar Ionkov v9fs_t_clunk(v9ses, nfid); 3916a3124a3SLatchesar Ionkov 3926a3124a3SLatchesar Ionkov error: 3936a3124a3SLatchesar Ionkov kfree(fcall); 3946a3124a3SLatchesar Ionkov return ERR_PTR(err); 3956a3124a3SLatchesar Ionkov } 396bd238fb4SLatchesar Ionkov */ 3976a3124a3SLatchesar Ionkov 39860e78d2cSAbhishek Kulkarni 39960e78d2cSAbhishek Kulkarni /** 40060e78d2cSAbhishek Kulkarni * v9fs_clear_inode - release an inode 40160e78d2cSAbhishek Kulkarni * @inode: inode to release 40260e78d2cSAbhishek Kulkarni * 40360e78d2cSAbhishek Kulkarni */ 404b57922d9SAl Viro void v9fs_evict_inode(struct inode *inode) 40560e78d2cSAbhishek Kulkarni { 406b57922d9SAl Viro truncate_inode_pages(inode->i_mapping, 0); 407b57922d9SAl Viro end_writeback(inode); 40860e78d2cSAbhishek Kulkarni filemap_fdatawrite(inode->i_mapping); 40960e78d2cSAbhishek Kulkarni 41060e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 41160e78d2cSAbhishek Kulkarni v9fs_cache_inode_put_cookie(inode); 41260e78d2cSAbhishek Kulkarni #endif 41360e78d2cSAbhishek Kulkarni } 41460e78d2cSAbhishek Kulkarni 41553c06f4eSAneesh Kumar K.V struct inode * 416f0853122SSripathi Kodi v9fs_inode(struct v9fs_session_info *v9ses, struct p9_fid *fid, 4176a3124a3SLatchesar Ionkov struct super_block *sb) 4186a3124a3SLatchesar Ionkov { 4196a3124a3SLatchesar Ionkov int err, umode; 420f0853122SSripathi Kodi struct inode *ret = NULL; 42151a87c55SEric Van Hensbergen struct p9_wstat *st; 4226a3124a3SLatchesar Ionkov 423bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 42402bc3567SAbhishek Kulkarni if (IS_ERR(st)) 42502bc3567SAbhishek Kulkarni return ERR_CAST(st); 4262bad8471SEric Van Hensbergen 427bd238fb4SLatchesar Ionkov umode = p9mode2unixmode(v9ses, st->mode); 4286a3124a3SLatchesar Ionkov ret = v9fs_get_inode(sb, umode); 4296a3124a3SLatchesar Ionkov if (IS_ERR(ret)) { 4306a3124a3SLatchesar Ionkov err = PTR_ERR(ret); 4316a3124a3SLatchesar Ionkov goto error; 4322bad8471SEric Van Hensbergen } 4332bad8471SEric Van Hensbergen 434bd238fb4SLatchesar Ionkov v9fs_stat2inode(st, ret, sb); 435bd238fb4SLatchesar Ionkov ret->i_ino = v9fs_qid2ino(&st->qid); 43660e78d2cSAbhishek Kulkarni 43760e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 43860e78d2cSAbhishek Kulkarni v9fs_vcookie_set_qid(ret, &st->qid); 43960e78d2cSAbhishek Kulkarni v9fs_cache_inode_get_cookie(ret); 44060e78d2cSAbhishek Kulkarni #endif 44102bc3567SAbhishek Kulkarni p9stat_free(st); 442bd238fb4SLatchesar Ionkov kfree(st); 4436a3124a3SLatchesar Ionkov return ret; 4446a3124a3SLatchesar Ionkov error: 44502bc3567SAbhishek Kulkarni p9stat_free(st); 446bd238fb4SLatchesar Ionkov kfree(st); 4476a3124a3SLatchesar Ionkov return ERR_PTR(err); 4482bad8471SEric Van Hensbergen } 4492bad8471SEric Van Hensbergen 4502bad8471SEric Van Hensbergen /** 4512bad8471SEric Van Hensbergen * v9fs_remove - helper function to remove files and directories 45273c592b9SEric Van Hensbergen * @dir: directory inode that is being deleted 45373c592b9SEric Van Hensbergen * @file: dentry that is being deleted 45473c592b9SEric Van Hensbergen * @rmdir: removing a directory 4552bad8471SEric Van Hensbergen * 4562bad8471SEric Van Hensbergen */ 4572bad8471SEric Van Hensbergen 4582bad8471SEric Van Hensbergen static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) 4592bad8471SEric Van Hensbergen { 460d994f405SAneesh Kumar K.V int retval; 461bd238fb4SLatchesar Ionkov struct inode *file_inode; 462bd238fb4SLatchesar Ionkov struct p9_fid *v9fid; 4632bad8471SEric Van Hensbergen 464bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, 4652bad8471SEric Van Hensbergen rmdir); 4662bad8471SEric Van Hensbergen 4672bad8471SEric Van Hensbergen file_inode = file->d_inode; 468c959df9fSLatchesar Ionkov v9fid = v9fs_fid_clone(file); 469da977b2cSEric Van Hensbergen if (IS_ERR(v9fid)) 470da977b2cSEric Van Hensbergen return PTR_ERR(v9fid); 4712bad8471SEric Van Hensbergen 472d994f405SAneesh Kumar K.V retval = p9_client_remove(v9fid); 473d994f405SAneesh Kumar K.V if (!retval) 474d994f405SAneesh Kumar K.V drop_nlink(file_inode); 475d994f405SAneesh Kumar K.V return retval; 4762bad8471SEric Van Hensbergen } 4772bad8471SEric Van Hensbergen 478bd238fb4SLatchesar Ionkov /** 479bd238fb4SLatchesar Ionkov * v9fs_create - Create a file 480ee443996SEric Van Hensbergen * @v9ses: session information 481ee443996SEric Van Hensbergen * @dir: directory that dentry is being created in 482bd238fb4SLatchesar Ionkov * @dentry: dentry that is being created 4830e15597eSAbhishek Kulkarni * @extension: 9p2000.u extension string to support devices, etc. 484bd238fb4SLatchesar Ionkov * @perm: create permissions 485bd238fb4SLatchesar Ionkov * @mode: open mode 486bd238fb4SLatchesar Ionkov * 487bd238fb4SLatchesar Ionkov */ 488bd238fb4SLatchesar Ionkov static struct p9_fid * 489bd238fb4SLatchesar Ionkov v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 490bd238fb4SLatchesar Ionkov struct dentry *dentry, char *extension, u32 perm, u8 mode) 491bd238fb4SLatchesar Ionkov { 492bd238fb4SLatchesar Ionkov int err; 493bd238fb4SLatchesar Ionkov char *name; 494bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *ofid, *fid; 495bd238fb4SLatchesar Ionkov struct inode *inode; 496bd238fb4SLatchesar Ionkov 49751a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 49851a87c55SEric Van Hensbergen 499bd238fb4SLatchesar Ionkov err = 0; 500bd238fb4SLatchesar Ionkov ofid = NULL; 501bd238fb4SLatchesar Ionkov fid = NULL; 502bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 5036d27e64dSVenkateswararao Jujjuri dfid = v9fs_fid_lookup(dentry->d_parent); 504bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) { 505bd238fb4SLatchesar Ionkov err = PTR_ERR(dfid); 5066d27e64dSVenkateswararao Jujjuri P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 5076d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 508bd238fb4SLatchesar Ionkov } 509bd238fb4SLatchesar Ionkov 510bd238fb4SLatchesar Ionkov /* clone a fid to use for creation */ 511bd238fb4SLatchesar Ionkov ofid = p9_client_walk(dfid, 0, NULL, 1); 512bd238fb4SLatchesar Ionkov if (IS_ERR(ofid)) { 513bd238fb4SLatchesar Ionkov err = PTR_ERR(ofid); 51451a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 5156d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 516bd238fb4SLatchesar Ionkov } 517bd238fb4SLatchesar Ionkov 518bd238fb4SLatchesar Ionkov err = p9_client_fcreate(ofid, name, perm, mode, extension); 51951a87c55SEric Van Hensbergen if (err < 0) { 52051a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 521bd238fb4SLatchesar Ionkov goto error; 52251a87c55SEric Van Hensbergen } 523bd238fb4SLatchesar Ionkov 524bd238fb4SLatchesar Ionkov /* now walk from the parent so we can get unopened fid */ 5256d27e64dSVenkateswararao Jujjuri fid = p9_client_walk(dfid, 1, &name, 1); 526bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 527bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 52851a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 529bd238fb4SLatchesar Ionkov fid = NULL; 530bd238fb4SLatchesar Ionkov goto error; 5316d27e64dSVenkateswararao Jujjuri } 532bd238fb4SLatchesar Ionkov 533bd238fb4SLatchesar Ionkov /* instantiate inode and assign the unopened fid to the dentry */ 534bd238fb4SLatchesar Ionkov inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 535bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 536bd238fb4SLatchesar Ionkov err = PTR_ERR(inode); 53751a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); 538bd238fb4SLatchesar Ionkov goto error; 539bd238fb4SLatchesar Ionkov } 540bd238fb4SLatchesar Ionkov 541bd238fb4SLatchesar Ionkov if (v9ses->cache) 542fb045adbSNick Piggin d_set_d_op(dentry, &v9fs_cached_dentry_operations); 543bd238fb4SLatchesar Ionkov else 544fb045adbSNick Piggin d_set_d_op(dentry, &v9fs_dentry_operations); 545bd238fb4SLatchesar Ionkov 546bd238fb4SLatchesar Ionkov d_instantiate(dentry, inode); 54750fb6d2bSAbhishek Kulkarni err = v9fs_fid_add(dentry, fid); 54850fb6d2bSAbhishek Kulkarni if (err < 0) 54950fb6d2bSAbhishek Kulkarni goto error; 55050fb6d2bSAbhishek Kulkarni 551bd238fb4SLatchesar Ionkov return ofid; 552bd238fb4SLatchesar Ionkov 553bd238fb4SLatchesar Ionkov error: 554bd238fb4SLatchesar Ionkov if (ofid) 555bd238fb4SLatchesar Ionkov p9_client_clunk(ofid); 556bd238fb4SLatchesar Ionkov 557bd238fb4SLatchesar Ionkov if (fid) 558bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 559bd238fb4SLatchesar Ionkov 560bd238fb4SLatchesar Ionkov return ERR_PTR(err); 561bd238fb4SLatchesar Ionkov } 562bd238fb4SLatchesar Ionkov 5632bad8471SEric Van Hensbergen /** 5642bad8471SEric Van Hensbergen * v9fs_vfs_create - VFS hook to create files 565ee443996SEric Van Hensbergen * @dir: directory inode that is being created 5662bad8471SEric Van Hensbergen * @dentry: dentry that is being deleted 5676a3124a3SLatchesar Ionkov * @mode: create permissions 5682bad8471SEric Van Hensbergen * @nd: path information 5692bad8471SEric Van Hensbergen * 5702bad8471SEric Van Hensbergen */ 5712bad8471SEric Van Hensbergen 5722bad8471SEric Van Hensbergen static int 5736a3124a3SLatchesar Ionkov v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 5742bad8471SEric Van Hensbergen struct nameidata *nd) 5752bad8471SEric Van Hensbergen { 5766a3124a3SLatchesar Ionkov int err; 577bd238fb4SLatchesar Ionkov u32 perm; 5786a3124a3SLatchesar Ionkov int flags; 5796a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 580bd238fb4SLatchesar Ionkov struct p9_fid *fid; 5816a3124a3SLatchesar Ionkov struct file *filp; 5826a3124a3SLatchesar Ionkov 583bd238fb4SLatchesar Ionkov err = 0; 584bd238fb4SLatchesar Ionkov fid = NULL; 5856a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 586da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 5876a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) 5886a3124a3SLatchesar Ionkov flags = nd->intent.open.flags - 1; 5896a3124a3SLatchesar Ionkov else 5906a3124a3SLatchesar Ionkov flags = O_RDWR; 5916a3124a3SLatchesar Ionkov 592bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 593dd6102fbSSripathi Kodi v9fs_uflags2omode(flags, 594dd6102fbSSripathi Kodi v9fs_proto_dotu(v9ses))); 595bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 596bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 597bd238fb4SLatchesar Ionkov fid = NULL; 5986a3124a3SLatchesar Ionkov goto error; 5996a3124a3SLatchesar Ionkov } 6006a3124a3SLatchesar Ionkov 601bd238fb4SLatchesar Ionkov /* if we are opening a file, assign the open fid to the file */ 6026a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) { 603877cb3d4SAneesh Kumar K.V filp = lookup_instantiate_filp(nd, dentry, generic_file_open); 6046a3124a3SLatchesar Ionkov if (IS_ERR(filp)) { 605bd238fb4SLatchesar Ionkov err = PTR_ERR(filp); 606bd238fb4SLatchesar Ionkov goto error; 6076a3124a3SLatchesar Ionkov } 6086a3124a3SLatchesar Ionkov 609bd238fb4SLatchesar Ionkov filp->private_data = fid; 610bd238fb4SLatchesar Ionkov } else 611bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6126a3124a3SLatchesar Ionkov 6136a3124a3SLatchesar Ionkov return 0; 6146a3124a3SLatchesar Ionkov 6156a3124a3SLatchesar Ionkov error: 616bd238fb4SLatchesar Ionkov if (fid) 617bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6186a3124a3SLatchesar Ionkov 6196a3124a3SLatchesar Ionkov return err; 6202bad8471SEric Van Hensbergen } 6212bad8471SEric Van Hensbergen 6222bad8471SEric Van Hensbergen /** 6232bad8471SEric Van Hensbergen * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 624ee443996SEric Van Hensbergen * @dir: inode that is being unlinked 6252bad8471SEric Van Hensbergen * @dentry: dentry that is being unlinked 6262bad8471SEric Van Hensbergen * @mode: mode for new directory 6272bad8471SEric Van Hensbergen * 6282bad8471SEric Van Hensbergen */ 6292bad8471SEric Van Hensbergen 6306a3124a3SLatchesar Ionkov static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 6312bad8471SEric Van Hensbergen { 6326a3124a3SLatchesar Ionkov int err; 633bd238fb4SLatchesar Ionkov u32 perm; 6346a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 635bd238fb4SLatchesar Ionkov struct p9_fid *fid; 6366a3124a3SLatchesar Ionkov 637bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 638bd238fb4SLatchesar Ionkov err = 0; 6396a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 6406a3124a3SLatchesar Ionkov perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 641bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 642bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 643bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 644bd238fb4SLatchesar Ionkov fid = NULL; 6456a3124a3SLatchesar Ionkov } 6466a3124a3SLatchesar Ionkov 647bd238fb4SLatchesar Ionkov if (fid) 648bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6496a3124a3SLatchesar Ionkov 6506a3124a3SLatchesar Ionkov return err; 6512bad8471SEric Van Hensbergen } 6522bad8471SEric Van Hensbergen 6532bad8471SEric Van Hensbergen /** 6542bad8471SEric Van Hensbergen * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 6552bad8471SEric Van Hensbergen * @dir: inode that is being walked from 6562bad8471SEric Van Hensbergen * @dentry: dentry that is being walked to? 6572bad8471SEric Van Hensbergen * @nameidata: path data 6582bad8471SEric Van Hensbergen * 6592bad8471SEric Van Hensbergen */ 6602bad8471SEric Van Hensbergen 66153c06f4eSAneesh Kumar K.V struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 6622bad8471SEric Van Hensbergen struct nameidata *nameidata) 6632bad8471SEric Van Hensbergen { 6642bad8471SEric Van Hensbergen struct super_block *sb; 6652bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses; 666bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *fid; 6672bad8471SEric Van Hensbergen struct inode *inode; 668bd238fb4SLatchesar Ionkov char *name; 6692bad8471SEric Van Hensbergen int result = 0; 6702bad8471SEric Van Hensbergen 671bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 672731805b4SLatchesar Ionkov dir, dentry->d_name.name, dentry, nameidata); 6732bad8471SEric Van Hensbergen 67411e9b49bSSripathi Kodi if (dentry->d_name.len > NAME_MAX) 67511e9b49bSSripathi Kodi return ERR_PTR(-ENAMETOOLONG); 67611e9b49bSSripathi Kodi 6772bad8471SEric Van Hensbergen sb = dir->i_sb; 6782bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(dir); 679a534c8d1SAneesh Kumar K.V /* We can walk d_parent because we hold the dir->i_mutex */ 680bd238fb4SLatchesar Ionkov dfid = v9fs_fid_lookup(dentry->d_parent); 681bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) 682e231c2eeSDavid Howells return ERR_CAST(dfid); 6832bad8471SEric Van Hensbergen 684bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 685bd238fb4SLatchesar Ionkov fid = p9_client_walk(dfid, 1, &name, 1); 686bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 687bd238fb4SLatchesar Ionkov result = PTR_ERR(fid); 6882bad8471SEric Van Hensbergen if (result == -ENOENT) { 68985e0df24SAneesh Kumar K.V inode = NULL; 69085e0df24SAneesh Kumar K.V goto inst_out; 6912bad8471SEric Van Hensbergen } 6922bad8471SEric Van Hensbergen 693bd238fb4SLatchesar Ionkov return ERR_PTR(result); 6942bad8471SEric Van Hensbergen } 6952bad8471SEric Van Hensbergen 696bd238fb4SLatchesar Ionkov inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 697bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 698bd238fb4SLatchesar Ionkov result = PTR_ERR(inode); 699bd238fb4SLatchesar Ionkov inode = NULL; 700bd238fb4SLatchesar Ionkov goto error; 7012bad8471SEric Van Hensbergen } 7022bad8471SEric Van Hensbergen 703bd238fb4SLatchesar Ionkov result = v9fs_fid_add(dentry, fid); 7046a3124a3SLatchesar Ionkov if (result < 0) 7059856af8bSAneesh Kumar K.V goto error_iput; 7066a3124a3SLatchesar Ionkov 70785e0df24SAneesh Kumar K.V inst_out: 70885e0df24SAneesh Kumar K.V if (v9ses->cache) 709fb045adbSNick Piggin d_set_d_op(dentry, &v9fs_cached_dentry_operations); 710e03abc0cSEric Van Hensbergen else 711fb045adbSNick Piggin d_set_d_op(dentry, &v9fs_dentry_operations); 7122bad8471SEric Van Hensbergen 7132bad8471SEric Van Hensbergen d_add(dentry, inode); 7142bad8471SEric Van Hensbergen return NULL; 7152bad8471SEric Van Hensbergen 7169856af8bSAneesh Kumar K.V error_iput: 7179856af8bSAneesh Kumar K.V iput(inode); 718bd238fb4SLatchesar Ionkov error: 719bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 720da977b2cSEric Van Hensbergen 7212bad8471SEric Van Hensbergen return ERR_PTR(result); 7222bad8471SEric Van Hensbergen } 7232bad8471SEric Van Hensbergen 7242bad8471SEric Van Hensbergen /** 7252bad8471SEric Van Hensbergen * v9fs_vfs_unlink - VFS unlink hook to delete an inode 7262bad8471SEric Van Hensbergen * @i: inode that is being unlinked 72773c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7282bad8471SEric Van Hensbergen * 7292bad8471SEric Van Hensbergen */ 7302bad8471SEric Van Hensbergen 73153c06f4eSAneesh Kumar K.V int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 7322bad8471SEric Van Hensbergen { 7332bad8471SEric Van Hensbergen return v9fs_remove(i, d, 0); 7342bad8471SEric Van Hensbergen } 7352bad8471SEric Van Hensbergen 7362bad8471SEric Van Hensbergen /** 7372bad8471SEric Van Hensbergen * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 7382bad8471SEric Van Hensbergen * @i: inode that is being unlinked 73973c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7402bad8471SEric Van Hensbergen * 7412bad8471SEric Van Hensbergen */ 7422bad8471SEric Van Hensbergen 74353c06f4eSAneesh Kumar K.V int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 7442bad8471SEric Van Hensbergen { 7452bad8471SEric Van Hensbergen return v9fs_remove(i, d, 1); 7462bad8471SEric Van Hensbergen } 7472bad8471SEric Van Hensbergen 7482bad8471SEric Van Hensbergen /** 7492bad8471SEric Van Hensbergen * v9fs_vfs_rename - VFS hook to rename an inode 7502bad8471SEric Van Hensbergen * @old_dir: old dir inode 7512bad8471SEric Van Hensbergen * @old_dentry: old dentry 7522bad8471SEric Van Hensbergen * @new_dir: new dir inode 7532bad8471SEric Van Hensbergen * @new_dentry: new dentry 7542bad8471SEric Van Hensbergen * 7552bad8471SEric Van Hensbergen */ 7562bad8471SEric Van Hensbergen 75753c06f4eSAneesh Kumar K.V int 7582bad8471SEric Van Hensbergen v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 7592bad8471SEric Van Hensbergen struct inode *new_dir, struct dentry *new_dentry) 7602bad8471SEric Van Hensbergen { 761bd238fb4SLatchesar Ionkov struct inode *old_inode; 762bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 763bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 764bd238fb4SLatchesar Ionkov struct p9_fid *olddirfid; 765bd238fb4SLatchesar Ionkov struct p9_fid *newdirfid; 766bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 767bd238fb4SLatchesar Ionkov int retval; 7682bad8471SEric Van Hensbergen 769bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 770bd238fb4SLatchesar Ionkov retval = 0; 771bd238fb4SLatchesar Ionkov old_inode = old_dentry->d_inode; 772bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(old_inode); 773bd238fb4SLatchesar Ionkov oldfid = v9fs_fid_lookup(old_dentry); 774da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 775da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 776da977b2cSEric Van Hensbergen 777da977b2cSEric Van Hensbergen olddirfid = v9fs_fid_clone(old_dentry->d_parent); 778da977b2cSEric Van Hensbergen if (IS_ERR(olddirfid)) { 779da977b2cSEric Van Hensbergen retval = PTR_ERR(olddirfid); 780bd238fb4SLatchesar Ionkov goto done; 781da977b2cSEric Van Hensbergen } 782da977b2cSEric Van Hensbergen 783da977b2cSEric Van Hensbergen newdirfid = v9fs_fid_clone(new_dentry->d_parent); 784da977b2cSEric Van Hensbergen if (IS_ERR(newdirfid)) { 785da977b2cSEric Van Hensbergen retval = PTR_ERR(newdirfid); 786bd238fb4SLatchesar Ionkov goto clunk_olddir; 7872bad8471SEric Van Hensbergen } 7882bad8471SEric Van Hensbergen 789a534c8d1SAneesh Kumar K.V down_write(&v9ses->rename_sem); 7904681dbdaSSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 7914681dbdaSSripathi Kodi retval = p9_client_rename(oldfid, newdirfid, 7924681dbdaSSripathi Kodi (char *) new_dentry->d_name.name); 7934681dbdaSSripathi Kodi if (retval != -ENOSYS) 7944681dbdaSSripathi Kodi goto clunk_newdir; 7954681dbdaSSripathi Kodi } 796a534c8d1SAneesh Kumar K.V if (old_dentry->d_parent != new_dentry->d_parent) { 797a534c8d1SAneesh Kumar K.V /* 798a534c8d1SAneesh Kumar K.V * 9P .u can only handle file rename in the same directory 799a534c8d1SAneesh Kumar K.V */ 8004681dbdaSSripathi Kodi 801bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 802bd238fb4SLatchesar Ionkov "old dir and new dir are different\n"); 803621997cdSEric Van Hensbergen retval = -EXDEV; 804bd238fb4SLatchesar Ionkov goto clunk_newdir; 8052bad8471SEric Van Hensbergen } 806531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 807ba17674fSLatchesar Ionkov wstat.muid = v9ses->uname; 808531b1094SLatchesar Ionkov wstat.name = (char *) new_dentry->d_name.name; 809bd238fb4SLatchesar Ionkov retval = p9_client_wstat(oldfid, &wstat); 8102bad8471SEric Van Hensbergen 811bd238fb4SLatchesar Ionkov clunk_newdir: 812a534c8d1SAneesh Kumar K.V if (!retval) 813a534c8d1SAneesh Kumar K.V /* successful rename */ 814a534c8d1SAneesh Kumar K.V d_move(old_dentry, new_dentry); 815a534c8d1SAneesh Kumar K.V up_write(&v9ses->rename_sem); 81622150c4fSLatchesar Ionkov p9_client_clunk(newdirfid); 8172bad8471SEric Van Hensbergen 818bd238fb4SLatchesar Ionkov clunk_olddir: 81922150c4fSLatchesar Ionkov p9_client_clunk(olddirfid); 8202bad8471SEric Van Hensbergen 821bd238fb4SLatchesar Ionkov done: 8222bad8471SEric Van Hensbergen return retval; 8232bad8471SEric Van Hensbergen } 8242bad8471SEric Van Hensbergen 8252bad8471SEric Van Hensbergen /** 826943ffb58SAdrian Bunk * v9fs_vfs_getattr - retrieve file metadata 827ee443996SEric Van Hensbergen * @mnt: mount information 828ee443996SEric Van Hensbergen * @dentry: file to get attributes on 829ee443996SEric Van Hensbergen * @stat: metadata structure to populate 8302bad8471SEric Van Hensbergen * 8312bad8471SEric Van Hensbergen */ 8322bad8471SEric Van Hensbergen 8332bad8471SEric Van Hensbergen static int 8342bad8471SEric Van Hensbergen v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 8352bad8471SEric Van Hensbergen struct kstat *stat) 8362bad8471SEric Van Hensbergen { 837bd238fb4SLatchesar Ionkov int err; 838bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 839bd238fb4SLatchesar Ionkov struct p9_fid *fid; 84051a87c55SEric Van Hensbergen struct p9_wstat *st; 8412bad8471SEric Van Hensbergen 842bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); 843bd238fb4SLatchesar Ionkov err = -EPERM; 844bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 84560e78d2cSAbhishek Kulkarni if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 8469523a841SEric Van Hensbergen return simple_getattr(mnt, dentry, stat); 8479523a841SEric Van Hensbergen 848bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 849da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 850da977b2cSEric Van Hensbergen return PTR_ERR(fid); 8512bad8471SEric Van Hensbergen 852bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 853bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 854bd238fb4SLatchesar Ionkov return PTR_ERR(st); 8552bad8471SEric Van Hensbergen 856bd238fb4SLatchesar Ionkov v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 8572bad8471SEric Van Hensbergen generic_fillattr(dentry->d_inode, stat); 8582bad8471SEric Van Hensbergen 85962b2be59SLatchesar Ionkov p9stat_free(st); 860bd238fb4SLatchesar Ionkov kfree(st); 861bd238fb4SLatchesar Ionkov return 0; 8622bad8471SEric Van Hensbergen } 8632bad8471SEric Van Hensbergen 8642bad8471SEric Van Hensbergen /** 8652bad8471SEric Van Hensbergen * v9fs_vfs_setattr - set file metadata 8662bad8471SEric Van Hensbergen * @dentry: file whose metadata to set 8672bad8471SEric Van Hensbergen * @iattr: metadata assignment structure 8682bad8471SEric Van Hensbergen * 8692bad8471SEric Van Hensbergen */ 8702bad8471SEric Van Hensbergen 8712bad8471SEric Van Hensbergen static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 8722bad8471SEric Van Hensbergen { 873bd238fb4SLatchesar Ionkov int retval; 874bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 875bd238fb4SLatchesar Ionkov struct p9_fid *fid; 876bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 8772bad8471SEric Van Hensbergen 878bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 879bd238fb4SLatchesar Ionkov retval = -EPERM; 880bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 881bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 882da977b2cSEric Van Hensbergen if(IS_ERR(fid)) 883da977b2cSEric Van Hensbergen return PTR_ERR(fid); 8842bad8471SEric Van Hensbergen 885531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 8862bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MODE) 887531b1094SLatchesar Ionkov wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 8882bad8471SEric Van Hensbergen 8892bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MTIME) 890531b1094SLatchesar Ionkov wstat.mtime = iattr->ia_mtime.tv_sec; 8912bad8471SEric Van Hensbergen 8922bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_ATIME) 893531b1094SLatchesar Ionkov wstat.atime = iattr->ia_atime.tv_sec; 8942bad8471SEric Van Hensbergen 8952bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_SIZE) 896531b1094SLatchesar Ionkov wstat.length = iattr->ia_size; 8972bad8471SEric Van Hensbergen 898dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 899531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_UID) 900531b1094SLatchesar Ionkov wstat.n_uid = iattr->ia_uid; 9012bad8471SEric Van Hensbergen 902531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_GID) 903531b1094SLatchesar Ionkov wstat.n_gid = iattr->ia_gid; 9042bad8471SEric Van Hensbergen } 9052bad8471SEric Van Hensbergen 906bd238fb4SLatchesar Ionkov retval = p9_client_wstat(fid, &wstat); 9071025774cSChristoph Hellwig if (retval < 0) 908bd238fb4SLatchesar Ionkov return retval; 9091025774cSChristoph Hellwig 9101025774cSChristoph Hellwig if ((iattr->ia_valid & ATTR_SIZE) && 9111025774cSChristoph Hellwig iattr->ia_size != i_size_read(dentry->d_inode)) { 9121025774cSChristoph Hellwig retval = vmtruncate(dentry->d_inode, iattr->ia_size); 9131025774cSChristoph Hellwig if (retval) 9141025774cSChristoph Hellwig return retval; 9151025774cSChristoph Hellwig } 9161025774cSChristoph Hellwig 9171025774cSChristoph Hellwig setattr_copy(dentry->d_inode, iattr); 9181025774cSChristoph Hellwig mark_inode_dirty(dentry->d_inode); 9191025774cSChristoph Hellwig return 0; 9202bad8471SEric Van Hensbergen } 9212bad8471SEric Van Hensbergen 9222bad8471SEric Van Hensbergen /** 923531b1094SLatchesar Ionkov * v9fs_stat2inode - populate an inode structure with mistat info 924531b1094SLatchesar Ionkov * @stat: Plan 9 metadata (mistat) structure 9252bad8471SEric Van Hensbergen * @inode: inode to populate 9262bad8471SEric Van Hensbergen * @sb: superblock of filesystem 9272bad8471SEric Van Hensbergen * 9282bad8471SEric Van Hensbergen */ 9292bad8471SEric Van Hensbergen 9302bad8471SEric Van Hensbergen void 93151a87c55SEric Van Hensbergen v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 9322bad8471SEric Van Hensbergen struct super_block *sb) 9332bad8471SEric Van Hensbergen { 934531b1094SLatchesar Ionkov char ext[32]; 9355717144aSAneesh Kumar K.V char tag_name[14]; 9365717144aSAneesh Kumar K.V unsigned int i_nlink; 9372bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 9382bad8471SEric Van Hensbergen 9392bad8471SEric Van Hensbergen inode->i_nlink = 1; 9402bad8471SEric Van Hensbergen 941531b1094SLatchesar Ionkov inode->i_atime.tv_sec = stat->atime; 942531b1094SLatchesar Ionkov inode->i_mtime.tv_sec = stat->mtime; 943531b1094SLatchesar Ionkov inode->i_ctime.tv_sec = stat->mtime; 9442bad8471SEric Van Hensbergen 945bd32b82dSLatchesar Ionkov inode->i_uid = v9ses->dfltuid; 946bd32b82dSLatchesar Ionkov inode->i_gid = v9ses->dfltgid; 9472bad8471SEric Van Hensbergen 948dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 949531b1094SLatchesar Ionkov inode->i_uid = stat->n_uid; 950531b1094SLatchesar Ionkov inode->i_gid = stat->n_gid; 951531b1094SLatchesar Ionkov } 9525717144aSAneesh Kumar K.V if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 9535717144aSAneesh Kumar K.V if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 9545717144aSAneesh Kumar K.V /* 9555717144aSAneesh Kumar K.V * Hadlink support got added later to 9565717144aSAneesh Kumar K.V * to the .u extension. So there can be 9575717144aSAneesh Kumar K.V * server out there that doesn't support 9585717144aSAneesh Kumar K.V * this even with .u extension. So check 9595717144aSAneesh Kumar K.V * for non NULL stat->extension 9605717144aSAneesh Kumar K.V */ 9615717144aSAneesh Kumar K.V strncpy(ext, stat->extension, sizeof(ext)); 9625717144aSAneesh Kumar K.V /* HARDLINKCOUNT %u */ 9635717144aSAneesh Kumar K.V sscanf(ext, "%13s %u", tag_name, &i_nlink); 9645717144aSAneesh Kumar K.V if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 9655717144aSAneesh Kumar K.V inode->i_nlink = i_nlink; 9665717144aSAneesh Kumar K.V } 9675717144aSAneesh Kumar K.V } 968531b1094SLatchesar Ionkov inode->i_mode = p9mode2unixmode(v9ses, stat->mode); 9692bad8471SEric Van Hensbergen if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 9702bad8471SEric Van Hensbergen char type = 0; 9712bad8471SEric Van Hensbergen int major = -1; 9722bad8471SEric Van Hensbergen int minor = -1; 973531b1094SLatchesar Ionkov 97451a87c55SEric Van Hensbergen strncpy(ext, stat->extension, sizeof(ext)); 975531b1094SLatchesar Ionkov sscanf(ext, "%c %u %u", &type, &major, &minor); 9762bad8471SEric Van Hensbergen switch (type) { 9772bad8471SEric Van Hensbergen case 'c': 9782bad8471SEric Van Hensbergen inode->i_mode &= ~S_IFBLK; 9792bad8471SEric Van Hensbergen inode->i_mode |= S_IFCHR; 9802bad8471SEric Van Hensbergen break; 9812bad8471SEric Van Hensbergen case 'b': 9822bad8471SEric Van Hensbergen break; 9832bad8471SEric Van Hensbergen default: 984bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 98551a87c55SEric Van Hensbergen "Unknown special type %c %s\n", type, 98651a87c55SEric Van Hensbergen stat->extension); 9872bad8471SEric Van Hensbergen }; 9882bad8471SEric Van Hensbergen inode->i_rdev = MKDEV(major, minor); 98957c7b4e6SMagnus Deininger init_special_inode(inode, inode->i_mode, inode->i_rdev); 9902bad8471SEric Van Hensbergen } else 9912bad8471SEric Van Hensbergen inode->i_rdev = 0; 9922bad8471SEric Van Hensbergen 9937549ae3eSAbhishek Kulkarni i_size_write(inode, stat->length); 9942bad8471SEric Van Hensbergen 995bd238fb4SLatchesar Ionkov /* not real number of blocks, but 512 byte ones ... */ 9967549ae3eSAbhishek Kulkarni inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 9972bad8471SEric Van Hensbergen } 9982bad8471SEric Van Hensbergen 9992bad8471SEric Van Hensbergen /** 10002bad8471SEric Van Hensbergen * v9fs_qid2ino - convert qid into inode number 10012bad8471SEric Van Hensbergen * @qid: qid to hash 10022bad8471SEric Van Hensbergen * 10032bad8471SEric Van Hensbergen * BUG: potential for inode number collisions? 10042bad8471SEric Van Hensbergen */ 10052bad8471SEric Van Hensbergen 1006bd238fb4SLatchesar Ionkov ino_t v9fs_qid2ino(struct p9_qid *qid) 10072bad8471SEric Van Hensbergen { 10082bad8471SEric Van Hensbergen u64 path = qid->path + 2; 10092bad8471SEric Van Hensbergen ino_t i = 0; 10102bad8471SEric Van Hensbergen 10112bad8471SEric Van Hensbergen if (sizeof(ino_t) == sizeof(path)) 10122bad8471SEric Van Hensbergen memcpy(&i, &path, sizeof(ino_t)); 10132bad8471SEric Van Hensbergen else 10142bad8471SEric Van Hensbergen i = (ino_t) (path ^ (path >> 32)); 10152bad8471SEric Van Hensbergen 10162bad8471SEric Van Hensbergen return i; 10172bad8471SEric Van Hensbergen } 10182bad8471SEric Van Hensbergen 10192bad8471SEric Van Hensbergen /** 10202bad8471SEric Van Hensbergen * v9fs_readlink - read a symlink's location (internal version) 10212bad8471SEric Van Hensbergen * @dentry: dentry for symlink 102273c592b9SEric Van Hensbergen * @buffer: buffer to load symlink location into 10232bad8471SEric Van Hensbergen * @buflen: length of buffer 10242bad8471SEric Van Hensbergen * 10252bad8471SEric Van Hensbergen */ 10262bad8471SEric Van Hensbergen 10272bad8471SEric Van Hensbergen static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 10282bad8471SEric Van Hensbergen { 1029bd238fb4SLatchesar Ionkov int retval; 10302bad8471SEric Van Hensbergen 1031bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1032bd238fb4SLatchesar Ionkov struct p9_fid *fid; 103351a87c55SEric Van Hensbergen struct p9_wstat *st; 10342bad8471SEric Van Hensbergen 1035bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 1036bd238fb4SLatchesar Ionkov retval = -EPERM; 1037bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 1038bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1039da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 1040da977b2cSEric Van Hensbergen return PTR_ERR(fid); 10412bad8471SEric Van Hensbergen 1042329176ccSM. Mohan Kumar if (!v9fs_proto_dotu(v9ses)) 1043bd238fb4SLatchesar Ionkov return -EBADF; 10442bad8471SEric Van Hensbergen 1045bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 1046bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 1047bd238fb4SLatchesar Ionkov return PTR_ERR(st); 10482bad8471SEric Van Hensbergen 1049bd238fb4SLatchesar Ionkov if (!(st->mode & P9_DMSYMLINK)) { 10502bad8471SEric Van Hensbergen retval = -EINVAL; 1051bd238fb4SLatchesar Ionkov goto done; 10522bad8471SEric Van Hensbergen } 10532bad8471SEric Van Hensbergen 10542bad8471SEric Van Hensbergen /* copy extension buffer into buffer */ 105551a87c55SEric Van Hensbergen strncpy(buffer, st->extension, buflen); 10562bad8471SEric Van Hensbergen 1057bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 105851a87c55SEric Van Hensbergen "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); 1059bd238fb4SLatchesar Ionkov 10602511cd0bSMartin Stava retval = strnlen(buffer, buflen); 1061bd238fb4SLatchesar Ionkov done: 106262b2be59SLatchesar Ionkov p9stat_free(st); 1063bd238fb4SLatchesar Ionkov kfree(st); 10642bad8471SEric Van Hensbergen return retval; 10652bad8471SEric Van Hensbergen } 10662bad8471SEric Van Hensbergen 10672bad8471SEric Van Hensbergen /** 10682bad8471SEric Van Hensbergen * v9fs_vfs_follow_link - follow a symlink path 10692bad8471SEric Van Hensbergen * @dentry: dentry for symlink 10702bad8471SEric Van Hensbergen * @nd: nameidata 10712bad8471SEric Van Hensbergen * 10722bad8471SEric Van Hensbergen */ 10732bad8471SEric Van Hensbergen 10742bad8471SEric Van Hensbergen static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 10752bad8471SEric Van Hensbergen { 10762bad8471SEric Van Hensbergen int len = 0; 10772bad8471SEric Van Hensbergen char *link = __getname(); 10782bad8471SEric Van Hensbergen 1079bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); 10802bad8471SEric Van Hensbergen 10812bad8471SEric Van Hensbergen if (!link) 10822bad8471SEric Van Hensbergen link = ERR_PTR(-ENOMEM); 10832bad8471SEric Van Hensbergen else { 108416cce6d2SLatchesar Ionkov len = v9fs_readlink(dentry, link, PATH_MAX); 10852bad8471SEric Van Hensbergen 10862bad8471SEric Van Hensbergen if (len < 0) { 1087ce44eeb6SDavi Arnaut __putname(link); 10882bad8471SEric Van Hensbergen link = ERR_PTR(len); 10892bad8471SEric Van Hensbergen } else 10902511cd0bSMartin Stava link[min(len, PATH_MAX-1)] = 0; 10912bad8471SEric Van Hensbergen } 10922bad8471SEric Van Hensbergen nd_set_link(nd, link); 10932bad8471SEric Van Hensbergen 10942bad8471SEric Van Hensbergen return NULL; 10952bad8471SEric Van Hensbergen } 10962bad8471SEric Van Hensbergen 10972bad8471SEric Van Hensbergen /** 10982bad8471SEric Van Hensbergen * v9fs_vfs_put_link - release a symlink path 10992bad8471SEric Van Hensbergen * @dentry: dentry for symlink 11002bad8471SEric Van Hensbergen * @nd: nameidata 1101ee443996SEric Van Hensbergen * @p: unused 11022bad8471SEric Van Hensbergen * 11032bad8471SEric Van Hensbergen */ 11042bad8471SEric Van Hensbergen 110553c06f4eSAneesh Kumar K.V void 1106ee443996SEric Van Hensbergen v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 11072bad8471SEric Van Hensbergen { 11082bad8471SEric Van Hensbergen char *s = nd_get_link(nd); 11092bad8471SEric Van Hensbergen 11106ff23207SDuane Griffin P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, 11116ff23207SDuane Griffin IS_ERR(s) ? "<error>" : s); 11122bad8471SEric Van Hensbergen if (!IS_ERR(s)) 1113ce44eeb6SDavi Arnaut __putname(s); 11142bad8471SEric Van Hensbergen } 11152bad8471SEric Van Hensbergen 1116ee443996SEric Van Hensbergen /** 1117ee443996SEric Van Hensbergen * v9fs_vfs_mkspecial - create a special file 1118ee443996SEric Van Hensbergen * @dir: inode to create special file in 1119ee443996SEric Van Hensbergen * @dentry: dentry to create 1120ee443996SEric Van Hensbergen * @mode: mode to create special file 1121ee443996SEric Van Hensbergen * @extension: 9p2000.u format extension string representing special file 1122ee443996SEric Van Hensbergen * 1123ee443996SEric Van Hensbergen */ 1124ee443996SEric Van Hensbergen 1125531b1094SLatchesar Ionkov static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1126531b1094SLatchesar Ionkov int mode, const char *extension) 1127531b1094SLatchesar Ionkov { 1128bd238fb4SLatchesar Ionkov u32 perm; 1129531b1094SLatchesar Ionkov struct v9fs_session_info *v9ses; 1130bd238fb4SLatchesar Ionkov struct p9_fid *fid; 1131531b1094SLatchesar Ionkov 11326a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 1133dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) { 1134bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); 11356a3124a3SLatchesar Ionkov return -EPERM; 1136531b1094SLatchesar Ionkov } 1137531b1094SLatchesar Ionkov 1138da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 1139bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1140bd238fb4SLatchesar Ionkov P9_OREAD); 1141bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) 1142bd238fb4SLatchesar Ionkov return PTR_ERR(fid); 1143da977b2cSEric Van Hensbergen 1144bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 11456a3124a3SLatchesar Ionkov return 0; 1146531b1094SLatchesar Ionkov } 1147531b1094SLatchesar Ionkov 1148531b1094SLatchesar Ionkov /** 1149531b1094SLatchesar Ionkov * v9fs_vfs_symlink - helper function to create symlinks 1150531b1094SLatchesar Ionkov * @dir: directory inode containing symlink 1151531b1094SLatchesar Ionkov * @dentry: dentry for symlink 1152531b1094SLatchesar Ionkov * @symname: symlink data 1153531b1094SLatchesar Ionkov * 1154ee443996SEric Van Hensbergen * See Also: 9P2000.u RFC for more information 1155531b1094SLatchesar Ionkov * 1156531b1094SLatchesar Ionkov */ 1157531b1094SLatchesar Ionkov 1158531b1094SLatchesar Ionkov static int 1159531b1094SLatchesar Ionkov v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1160531b1094SLatchesar Ionkov { 1161bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, 1162bd238fb4SLatchesar Ionkov dentry->d_name.name, symname); 1163531b1094SLatchesar Ionkov 1164531b1094SLatchesar Ionkov return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1165531b1094SLatchesar Ionkov } 1166531b1094SLatchesar Ionkov 11672bad8471SEric Van Hensbergen /** 11682bad8471SEric Van Hensbergen * v9fs_vfs_link - create a hardlink 11692bad8471SEric Van Hensbergen * @old_dentry: dentry for file to link to 11702bad8471SEric Van Hensbergen * @dir: inode destination for new link 117173c592b9SEric Van Hensbergen * @dentry: dentry for link 11722bad8471SEric Van Hensbergen * 11732bad8471SEric Van Hensbergen */ 11742bad8471SEric Van Hensbergen 11752bad8471SEric Van Hensbergen static int 11762bad8471SEric Van Hensbergen v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 11772bad8471SEric Van Hensbergen struct dentry *dentry) 11782bad8471SEric Van Hensbergen { 1179531b1094SLatchesar Ionkov int retval; 1180bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 1181531b1094SLatchesar Ionkov char *name; 11822bad8471SEric Van Hensbergen 1183bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1184bd238fb4SLatchesar Ionkov " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 11852bad8471SEric Van Hensbergen old_dentry->d_name.name); 11862bad8471SEric Van Hensbergen 1187da977b2cSEric Van Hensbergen oldfid = v9fs_fid_clone(old_dentry); 1188da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 1189da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 11902bad8471SEric Van Hensbergen 1191531b1094SLatchesar Ionkov name = __getname(); 1192da977b2cSEric Van Hensbergen if (unlikely(!name)) { 1193da977b2cSEric Van Hensbergen retval = -ENOMEM; 1194da977b2cSEric Van Hensbergen goto clunk_fid; 1195da977b2cSEric Van Hensbergen } 11960710d36aSFlorin Malita 119716cce6d2SLatchesar Ionkov sprintf(name, "%d\n", oldfid->fid); 1198bd238fb4SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1199531b1094SLatchesar Ionkov __putname(name); 12002bad8471SEric Van Hensbergen 1201da977b2cSEric Van Hensbergen clunk_fid: 1202bd238fb4SLatchesar Ionkov p9_client_clunk(oldfid); 12032bad8471SEric Van Hensbergen return retval; 12042bad8471SEric Van Hensbergen } 12052bad8471SEric Van Hensbergen 12062bad8471SEric Van Hensbergen /** 12072bad8471SEric Van Hensbergen * v9fs_vfs_mknod - create a special file 12082bad8471SEric Van Hensbergen * @dir: inode destination for new link 12092bad8471SEric Van Hensbergen * @dentry: dentry for file 12102bad8471SEric Van Hensbergen * @mode: mode for creation 1211ee443996SEric Van Hensbergen * @rdev: device associated with special file 12122bad8471SEric Van Hensbergen * 12132bad8471SEric Van Hensbergen */ 12142bad8471SEric Van Hensbergen 12152bad8471SEric Van Hensbergen static int 12162bad8471SEric Van Hensbergen v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 12172bad8471SEric Van Hensbergen { 1218531b1094SLatchesar Ionkov int retval; 1219531b1094SLatchesar Ionkov char *name; 12202bad8471SEric Van Hensbergen 1221bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1222bd238fb4SLatchesar Ionkov " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 12232bad8471SEric Van Hensbergen dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 12242bad8471SEric Van Hensbergen 1225531b1094SLatchesar Ionkov if (!new_valid_dev(rdev)) 1226531b1094SLatchesar Ionkov return -EINVAL; 122773c592b9SEric Van Hensbergen 1228531b1094SLatchesar Ionkov name = __getname(); 1229c0291a05SEugene Teo if (!name) 1230c0291a05SEugene Teo return -ENOMEM; 12312bad8471SEric Van Hensbergen /* build extension */ 12322bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 1233531b1094SLatchesar Ionkov sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 12342bad8471SEric Van Hensbergen else if (S_ISCHR(mode)) 1235531b1094SLatchesar Ionkov sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 123673c592b9SEric Van Hensbergen else if (S_ISFIFO(mode)) 1237531b1094SLatchesar Ionkov *name = 0; 123875cc5c9bSVenkateswararao Jujjuri else if (S_ISSOCK(mode)) 123975cc5c9bSVenkateswararao Jujjuri *name = 0; 12402bad8471SEric Van Hensbergen else { 1241531b1094SLatchesar Ionkov __putname(name); 1242531b1094SLatchesar Ionkov return -EINVAL; 12432bad8471SEric Van Hensbergen } 12442bad8471SEric Van Hensbergen 1245531b1094SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1246531b1094SLatchesar Ionkov __putname(name); 12472bad8471SEric Van Hensbergen 12482bad8471SEric Van Hensbergen return retval; 12492bad8471SEric Van Hensbergen } 12502bad8471SEric Van Hensbergen 12519b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotu = { 12529b6533c9SSripathi Kodi .create = v9fs_vfs_create, 12539b6533c9SSripathi Kodi .lookup = v9fs_vfs_lookup, 12549b6533c9SSripathi Kodi .symlink = v9fs_vfs_symlink, 125550cc42ffSVenkateswararao Jujjuri (JV) .link = v9fs_vfs_link, 12569b6533c9SSripathi Kodi .unlink = v9fs_vfs_unlink, 12579b6533c9SSripathi Kodi .mkdir = v9fs_vfs_mkdir, 12589b6533c9SSripathi Kodi .rmdir = v9fs_vfs_rmdir, 12591d76e313SAneesh Kumar K.V .mknod = v9fs_vfs_mknod, 12609b6533c9SSripathi Kodi .rename = v9fs_vfs_rename, 12619b6533c9SSripathi Kodi .getattr = v9fs_vfs_getattr, 12629b6533c9SSripathi Kodi .setattr = v9fs_vfs_setattr, 12639b6533c9SSripathi Kodi }; 12649b6533c9SSripathi Kodi 1265754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations = { 1266b501611aSEric Van Hensbergen .create = v9fs_vfs_create, 1267b501611aSEric Van Hensbergen .lookup = v9fs_vfs_lookup, 1268b501611aSEric Van Hensbergen .unlink = v9fs_vfs_unlink, 1269b501611aSEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 1270b501611aSEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 1271b501611aSEric Van Hensbergen .mknod = v9fs_vfs_mknod, 1272b501611aSEric Van Hensbergen .rename = v9fs_vfs_rename, 1273b501611aSEric Van Hensbergen .getattr = v9fs_vfs_getattr, 1274b501611aSEric Van Hensbergen .setattr = v9fs_vfs_setattr, 1275b501611aSEric Van Hensbergen }; 1276b501611aSEric Van Hensbergen 1277754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations = { 12782bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 12792bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 12802bad8471SEric Van Hensbergen }; 12812bad8471SEric Van Hensbergen 1282754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations = { 1283204f2f0eSAl Viro .readlink = generic_readlink, 12842bad8471SEric Van Hensbergen .follow_link = v9fs_vfs_follow_link, 12852bad8471SEric Van Hensbergen .put_link = v9fs_vfs_put_link, 12862bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 12872bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 12882bad8471SEric Van Hensbergen }; 12899b6533c9SSripathi Kodi 1290