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 /** 20760e78d2cSAbhishek Kulkarni * v9fs_alloc_inode - helper function to allocate an inode 20860e78d2cSAbhishek Kulkarni * 20960e78d2cSAbhishek Kulkarni */ 21060e78d2cSAbhishek Kulkarni struct inode *v9fs_alloc_inode(struct super_block *sb) 21160e78d2cSAbhishek Kulkarni { 212a78ce05dSAneesh Kumar K.V struct v9fs_inode *v9inode; 213a78ce05dSAneesh Kumar K.V v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache, 21460e78d2cSAbhishek Kulkarni GFP_KERNEL); 215a78ce05dSAneesh Kumar K.V if (!v9inode) 21660e78d2cSAbhishek Kulkarni return NULL; 217a78ce05dSAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 218a78ce05dSAneesh Kumar K.V v9inode->fscache = NULL; 219a78ce05dSAneesh Kumar K.V v9inode->fscache_key = NULL; 220a78ce05dSAneesh Kumar K.V spin_lock_init(&v9inode->fscache_lock); 221a78ce05dSAneesh Kumar K.V #endif 222a78ce05dSAneesh Kumar K.V return &v9inode->vfs_inode; 22360e78d2cSAbhishek Kulkarni } 22460e78d2cSAbhishek Kulkarni 22560e78d2cSAbhishek Kulkarni /** 22660e78d2cSAbhishek Kulkarni * v9fs_destroy_inode - destroy an inode 22760e78d2cSAbhishek Kulkarni * 22860e78d2cSAbhishek Kulkarni */ 22960e78d2cSAbhishek Kulkarni 230fa0d7e3dSNick Piggin static void v9fs_i_callback(struct rcu_head *head) 231fa0d7e3dSNick Piggin { 232fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 233fa0d7e3dSNick Piggin INIT_LIST_HEAD(&inode->i_dentry); 234a78ce05dSAneesh Kumar K.V kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 235fa0d7e3dSNick Piggin } 236fa0d7e3dSNick Piggin 23760e78d2cSAbhishek Kulkarni void v9fs_destroy_inode(struct inode *inode) 23860e78d2cSAbhishek Kulkarni { 239fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, v9fs_i_callback); 24060e78d2cSAbhishek Kulkarni } 24160e78d2cSAbhishek Kulkarni 2425ffc0cb3SAneesh Kumar K.V int v9fs_init_inode(struct v9fs_session_info *v9ses, 2435ffc0cb3SAneesh Kumar K.V struct inode *inode, int mode) 2442bad8471SEric Van Hensbergen { 2455ffc0cb3SAneesh Kumar K.V int err = 0; 2462bb54115SAbhishek Kulkarni 247217f206dSDmitry Monakhov inode_init_owner(inode, NULL, mode); 2482bad8471SEric Van Hensbergen inode->i_blocks = 0; 2492bad8471SEric Van Hensbergen inode->i_rdev = 0; 2502bad8471SEric Van Hensbergen inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 251147b31cfSEric Van Hensbergen inode->i_mapping->a_ops = &v9fs_addr_operations; 2522bad8471SEric Van Hensbergen 2532bad8471SEric Van Hensbergen switch (mode & S_IFMT) { 2542bad8471SEric Van Hensbergen case S_IFIFO: 2552bad8471SEric Van Hensbergen case S_IFBLK: 2562bad8471SEric Van Hensbergen case S_IFCHR: 2572bad8471SEric Van Hensbergen case S_IFSOCK: 2584b43516aSM. Mohan Kumar if (v9fs_proto_dotl(v9ses)) { 2594b43516aSM. Mohan Kumar inode->i_op = &v9fs_file_inode_operations_dotl; 2604b43516aSM. Mohan Kumar inode->i_fop = &v9fs_file_operations_dotl; 2614b43516aSM. Mohan Kumar } else if (v9fs_proto_dotu(v9ses)) { 2624b43516aSM. Mohan Kumar inode->i_op = &v9fs_file_inode_operations; 2634b43516aSM. Mohan Kumar inode->i_fop = &v9fs_file_operations; 2644b43516aSM. Mohan Kumar } else { 265bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 266bd238fb4SLatchesar Ionkov "special files without extended mode\n"); 2672bb54115SAbhishek Kulkarni err = -EINVAL; 2682bb54115SAbhishek Kulkarni goto error; 269b501611aSEric Van Hensbergen } 2702bb54115SAbhishek Kulkarni init_special_inode(inode, inode->i_mode, inode->i_rdev); 2715d58bec5SEric Van Hensbergen break; 2722bad8471SEric Van Hensbergen case S_IFREG: 2739b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 2749b6533c9SSripathi Kodi inode->i_op = &v9fs_file_inode_operations_dotl; 27529236f4eSAneesh Kumar K.V if (v9ses->cache) 27629236f4eSAneesh Kumar K.V inode->i_fop = 27729236f4eSAneesh Kumar K.V &v9fs_cached_file_operations_dotl; 27829236f4eSAneesh Kumar K.V else 2799b6533c9SSripathi Kodi inode->i_fop = &v9fs_file_operations_dotl; 2809b6533c9SSripathi Kodi } else { 2812bad8471SEric Van Hensbergen inode->i_op = &v9fs_file_inode_operations; 28229236f4eSAneesh Kumar K.V if (v9ses->cache) 28329236f4eSAneesh Kumar K.V inode->i_fop = &v9fs_cached_file_operations; 28429236f4eSAneesh Kumar K.V else 2852bad8471SEric Van Hensbergen inode->i_fop = &v9fs_file_operations; 2869b6533c9SSripathi Kodi } 2879b6533c9SSripathi Kodi 2882bad8471SEric Van Hensbergen break; 289b501611aSEric Van Hensbergen case S_IFLNK: 2909b6533c9SSripathi Kodi if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 2919b6533c9SSripathi Kodi P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " 2929b6533c9SSripathi Kodi "legacy protocol.\n"); 2932bb54115SAbhishek Kulkarni err = -EINVAL; 2942bb54115SAbhishek Kulkarni goto error; 295b501611aSEric Van Hensbergen } 2969b6533c9SSripathi Kodi 2979b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 2989b6533c9SSripathi Kodi inode->i_op = &v9fs_symlink_inode_operations_dotl; 2999b6533c9SSripathi Kodi else 300b501611aSEric Van Hensbergen inode->i_op = &v9fs_symlink_inode_operations; 3019b6533c9SSripathi Kodi 302b501611aSEric Van Hensbergen break; 3032bad8471SEric Van Hensbergen case S_IFDIR: 304d8c76e6fSDave Hansen inc_nlink(inode); 3059b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3069b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotl; 3079b6533c9SSripathi Kodi else if (v9fs_proto_dotu(v9ses)) 3089b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotu; 309b501611aSEric Van Hensbergen else 3102bad8471SEric Van Hensbergen inode->i_op = &v9fs_dir_inode_operations; 3119b6533c9SSripathi Kodi 3129b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3139b6533c9SSripathi Kodi inode->i_fop = &v9fs_dir_operations_dotl; 3149b6533c9SSripathi Kodi else 3152bad8471SEric Van Hensbergen inode->i_fop = &v9fs_dir_operations; 3169b6533c9SSripathi Kodi 3172bad8471SEric Van Hensbergen break; 3182bad8471SEric Van Hensbergen default: 3192bb54115SAbhishek Kulkarni P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 3202bad8471SEric Van Hensbergen mode, mode & S_IFMT); 3212bb54115SAbhishek Kulkarni err = -EINVAL; 3222bb54115SAbhishek Kulkarni goto error; 3232bad8471SEric Van Hensbergen } 3242bb54115SAbhishek Kulkarni error: 3255ffc0cb3SAneesh Kumar K.V return err; 3265ffc0cb3SAneesh Kumar K.V 3275ffc0cb3SAneesh Kumar K.V } 3285ffc0cb3SAneesh Kumar K.V 3295ffc0cb3SAneesh Kumar K.V /** 3305ffc0cb3SAneesh Kumar K.V * v9fs_get_inode - helper function to setup an inode 3315ffc0cb3SAneesh Kumar K.V * @sb: superblock 3325ffc0cb3SAneesh Kumar K.V * @mode: mode to setup inode with 3335ffc0cb3SAneesh Kumar K.V * 3345ffc0cb3SAneesh Kumar K.V */ 3355ffc0cb3SAneesh Kumar K.V 3365ffc0cb3SAneesh Kumar K.V struct inode *v9fs_get_inode(struct super_block *sb, int mode) 3375ffc0cb3SAneesh Kumar K.V { 3385ffc0cb3SAneesh Kumar K.V int err; 3395ffc0cb3SAneesh Kumar K.V struct inode *inode; 3405ffc0cb3SAneesh Kumar K.V struct v9fs_session_info *v9ses = sb->s_fs_info; 3415ffc0cb3SAneesh Kumar K.V 3425ffc0cb3SAneesh Kumar K.V P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 3435ffc0cb3SAneesh Kumar K.V 3445ffc0cb3SAneesh Kumar K.V inode = new_inode(sb); 3455ffc0cb3SAneesh Kumar K.V if (!inode) { 3465ffc0cb3SAneesh Kumar K.V P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); 3475ffc0cb3SAneesh Kumar K.V return ERR_PTR(-ENOMEM); 3485ffc0cb3SAneesh Kumar K.V } 3495ffc0cb3SAneesh Kumar K.V err = v9fs_init_inode(v9ses, inode, mode); 3505ffc0cb3SAneesh Kumar K.V if (err) { 3512bb54115SAbhishek Kulkarni iput(inode); 3522bb54115SAbhishek Kulkarni return ERR_PTR(err); 3532bad8471SEric Van Hensbergen } 3545ffc0cb3SAneesh Kumar K.V return inode; 3555ffc0cb3SAneesh Kumar K.V } 3562bad8471SEric Van Hensbergen 357bd238fb4SLatchesar Ionkov /* 3586a3124a3SLatchesar Ionkov static struct v9fs_fid* 3596a3124a3SLatchesar Ionkov v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 3606a3124a3SLatchesar Ionkov { 3616a3124a3SLatchesar Ionkov int err; 362736c4b85SMika Kukkonen int nfid; 3636a3124a3SLatchesar Ionkov struct v9fs_fid *ret; 3646a3124a3SLatchesar Ionkov struct v9fs_fcall *fcall; 3650b8dd177SLatchesar Ionkov 3666a3124a3SLatchesar Ionkov nfid = v9fs_get_idpool(&v9ses->fidpool); 3676a3124a3SLatchesar Ionkov if (nfid < 0) { 3680b8dd177SLatchesar Ionkov eprintk(KERN_WARNING, "no free fids available\n"); 369731805b4SLatchesar Ionkov return ERR_PTR(-ENOSPC); 3700b8dd177SLatchesar Ionkov } 3710b8dd177SLatchesar Ionkov 3726a3124a3SLatchesar Ionkov err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 3736a3124a3SLatchesar Ionkov &fcall); 3746a3124a3SLatchesar Ionkov 3756a3124a3SLatchesar Ionkov if (err < 0) { 37641e5a6acSLatchesar Ionkov if (fcall && fcall->id == RWALK) 37741e5a6acSLatchesar Ionkov goto clunk_fid; 37841e5a6acSLatchesar Ionkov 3796a3124a3SLatchesar Ionkov PRINT_FCALL_ERROR("walk error", fcall); 3806a3124a3SLatchesar Ionkov v9fs_put_idpool(nfid, &v9ses->fidpool); 3816a3124a3SLatchesar Ionkov goto error; 3820b8dd177SLatchesar Ionkov } 3836a3124a3SLatchesar Ionkov 3843cf6429aSLatchesar Ionkov kfree(fcall); 3853cf6429aSLatchesar Ionkov fcall = NULL; 3866a3124a3SLatchesar Ionkov ret = v9fs_fid_create(v9ses, nfid); 3876a3124a3SLatchesar Ionkov if (!ret) { 3886a3124a3SLatchesar Ionkov err = -ENOMEM; 3896a3124a3SLatchesar Ionkov goto clunk_fid; 3900b8dd177SLatchesar Ionkov } 3912bad8471SEric Van Hensbergen 3926a3124a3SLatchesar Ionkov err = v9fs_fid_insert(ret, dentry); 3936a3124a3SLatchesar Ionkov if (err < 0) { 3946a3124a3SLatchesar Ionkov v9fs_fid_destroy(ret); 3956a3124a3SLatchesar Ionkov goto clunk_fid; 3966a3124a3SLatchesar Ionkov } 3972bad8471SEric Van Hensbergen 3986a3124a3SLatchesar Ionkov return ret; 3996a3124a3SLatchesar Ionkov 4006a3124a3SLatchesar Ionkov clunk_fid: 4016a3124a3SLatchesar Ionkov v9fs_t_clunk(v9ses, nfid); 4026a3124a3SLatchesar Ionkov 4036a3124a3SLatchesar Ionkov error: 4046a3124a3SLatchesar Ionkov kfree(fcall); 4056a3124a3SLatchesar Ionkov return ERR_PTR(err); 4066a3124a3SLatchesar Ionkov } 407bd238fb4SLatchesar Ionkov */ 4086a3124a3SLatchesar Ionkov 40960e78d2cSAbhishek Kulkarni 41060e78d2cSAbhishek Kulkarni /** 41160e78d2cSAbhishek Kulkarni * v9fs_clear_inode - release an inode 41260e78d2cSAbhishek Kulkarni * @inode: inode to release 41360e78d2cSAbhishek Kulkarni * 41460e78d2cSAbhishek Kulkarni */ 415b57922d9SAl Viro void v9fs_evict_inode(struct inode *inode) 41660e78d2cSAbhishek Kulkarni { 417b57922d9SAl Viro truncate_inode_pages(inode->i_mapping, 0); 418b57922d9SAl Viro end_writeback(inode); 41960e78d2cSAbhishek Kulkarni filemap_fdatawrite(inode->i_mapping); 42060e78d2cSAbhishek Kulkarni 42160e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 42260e78d2cSAbhishek Kulkarni v9fs_cache_inode_put_cookie(inode); 42360e78d2cSAbhishek Kulkarni #endif 4243cf387d7SAneesh Kumar K.V /* clunk the fid stashed in inode->i_private */ 4253cf387d7SAneesh Kumar K.V if (inode->i_private) { 4263cf387d7SAneesh Kumar K.V p9_client_clunk((struct p9_fid *)inode->i_private); 4273cf387d7SAneesh Kumar K.V inode->i_private = NULL; 4283cf387d7SAneesh Kumar K.V } 42960e78d2cSAbhishek Kulkarni } 43060e78d2cSAbhishek Kulkarni 4315ffc0cb3SAneesh Kumar K.V static struct inode *v9fs_qid_iget(struct super_block *sb, 4325ffc0cb3SAneesh Kumar K.V struct p9_qid *qid, 4335ffc0cb3SAneesh Kumar K.V struct p9_wstat *st) 4345ffc0cb3SAneesh Kumar K.V { 4355ffc0cb3SAneesh Kumar K.V int retval, umode; 4365ffc0cb3SAneesh Kumar K.V unsigned long i_ino; 4375ffc0cb3SAneesh Kumar K.V struct inode *inode; 4385ffc0cb3SAneesh Kumar K.V struct v9fs_session_info *v9ses = sb->s_fs_info; 4395ffc0cb3SAneesh Kumar K.V 4405ffc0cb3SAneesh Kumar K.V i_ino = v9fs_qid2ino(qid); 4415ffc0cb3SAneesh Kumar K.V inode = iget_locked(sb, i_ino); 4425ffc0cb3SAneesh Kumar K.V if (!inode) 4435ffc0cb3SAneesh Kumar K.V return ERR_PTR(-ENOMEM); 4445ffc0cb3SAneesh Kumar K.V if (!(inode->i_state & I_NEW)) 4455ffc0cb3SAneesh Kumar K.V return inode; 4465ffc0cb3SAneesh Kumar K.V /* 4475ffc0cb3SAneesh Kumar K.V * initialize the inode with the stat info 4485ffc0cb3SAneesh Kumar K.V * FIXME!! we may need support for stale inodes 4495ffc0cb3SAneesh Kumar K.V * later. 4505ffc0cb3SAneesh Kumar K.V */ 4515ffc0cb3SAneesh Kumar K.V umode = p9mode2unixmode(v9ses, st->mode); 4525ffc0cb3SAneesh Kumar K.V retval = v9fs_init_inode(v9ses, inode, umode); 4535ffc0cb3SAneesh Kumar K.V if (retval) 4545ffc0cb3SAneesh Kumar K.V goto error; 4555ffc0cb3SAneesh Kumar K.V 4565ffc0cb3SAneesh Kumar K.V v9fs_stat2inode(st, inode, sb); 4575ffc0cb3SAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 458a78ce05dSAneesh Kumar K.V v9fs_fscache_set_key(inode, &st->qid); 4595ffc0cb3SAneesh Kumar K.V v9fs_cache_inode_get_cookie(inode); 4605ffc0cb3SAneesh Kumar K.V #endif 4615ffc0cb3SAneesh Kumar K.V unlock_new_inode(inode); 4625ffc0cb3SAneesh Kumar K.V return inode; 4635ffc0cb3SAneesh Kumar K.V error: 4645ffc0cb3SAneesh Kumar K.V unlock_new_inode(inode); 4655ffc0cb3SAneesh Kumar K.V iput(inode); 4665ffc0cb3SAneesh Kumar K.V return ERR_PTR(retval); 4675ffc0cb3SAneesh Kumar K.V 4685ffc0cb3SAneesh Kumar K.V } 4695ffc0cb3SAneesh Kumar K.V 47053c06f4eSAneesh Kumar K.V struct inode * 471a78ce05dSAneesh Kumar K.V v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 4726a3124a3SLatchesar Ionkov struct super_block *sb) 4736a3124a3SLatchesar Ionkov { 47451a87c55SEric Van Hensbergen struct p9_wstat *st; 4755ffc0cb3SAneesh Kumar K.V struct inode *inode = NULL; 4766a3124a3SLatchesar Ionkov 477bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 47802bc3567SAbhishek Kulkarni if (IS_ERR(st)) 47902bc3567SAbhishek Kulkarni return ERR_CAST(st); 4802bad8471SEric Van Hensbergen 4815ffc0cb3SAneesh Kumar K.V inode = v9fs_qid_iget(sb, &st->qid, st); 48202bc3567SAbhishek Kulkarni p9stat_free(st); 483bd238fb4SLatchesar Ionkov kfree(st); 4845ffc0cb3SAneesh Kumar K.V return inode; 4852bad8471SEric Van Hensbergen } 4862bad8471SEric Van Hensbergen 4872bad8471SEric Van Hensbergen /** 4882bad8471SEric Van Hensbergen * v9fs_remove - helper function to remove files and directories 48973c592b9SEric Van Hensbergen * @dir: directory inode that is being deleted 49073c592b9SEric Van Hensbergen * @file: dentry that is being deleted 49173c592b9SEric Van Hensbergen * @rmdir: removing a directory 4922bad8471SEric Van Hensbergen * 4932bad8471SEric Van Hensbergen */ 4942bad8471SEric Van Hensbergen 4952bad8471SEric Van Hensbergen static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) 4962bad8471SEric Van Hensbergen { 497d994f405SAneesh Kumar K.V int retval; 498bd238fb4SLatchesar Ionkov struct inode *file_inode; 499bd238fb4SLatchesar Ionkov struct p9_fid *v9fid; 5002bad8471SEric Van Hensbergen 501bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, 5022bad8471SEric Van Hensbergen rmdir); 5032bad8471SEric Van Hensbergen 5042bad8471SEric Van Hensbergen file_inode = file->d_inode; 505c959df9fSLatchesar Ionkov v9fid = v9fs_fid_clone(file); 506da977b2cSEric Van Hensbergen if (IS_ERR(v9fid)) 507da977b2cSEric Van Hensbergen return PTR_ERR(v9fid); 5082bad8471SEric Van Hensbergen 509d994f405SAneesh Kumar K.V retval = p9_client_remove(v9fid); 510d994f405SAneesh Kumar K.V if (!retval) 511d994f405SAneesh Kumar K.V drop_nlink(file_inode); 512d994f405SAneesh Kumar K.V return retval; 5132bad8471SEric Van Hensbergen } 5142bad8471SEric Van Hensbergen 515bd238fb4SLatchesar Ionkov /** 516bd238fb4SLatchesar Ionkov * v9fs_create - Create a file 517ee443996SEric Van Hensbergen * @v9ses: session information 518ee443996SEric Van Hensbergen * @dir: directory that dentry is being created in 519bd238fb4SLatchesar Ionkov * @dentry: dentry that is being created 5200e15597eSAbhishek Kulkarni * @extension: 9p2000.u extension string to support devices, etc. 521bd238fb4SLatchesar Ionkov * @perm: create permissions 522bd238fb4SLatchesar Ionkov * @mode: open mode 523bd238fb4SLatchesar Ionkov * 524bd238fb4SLatchesar Ionkov */ 525bd238fb4SLatchesar Ionkov static struct p9_fid * 526bd238fb4SLatchesar Ionkov v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 527bd238fb4SLatchesar Ionkov struct dentry *dentry, char *extension, u32 perm, u8 mode) 528bd238fb4SLatchesar Ionkov { 529bd238fb4SLatchesar Ionkov int err; 530bd238fb4SLatchesar Ionkov char *name; 531bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *ofid, *fid; 532bd238fb4SLatchesar Ionkov struct inode *inode; 533bd238fb4SLatchesar Ionkov 53451a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 53551a87c55SEric Van Hensbergen 536bd238fb4SLatchesar Ionkov err = 0; 537bd238fb4SLatchesar Ionkov ofid = NULL; 538bd238fb4SLatchesar Ionkov fid = NULL; 539bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 5406d27e64dSVenkateswararao Jujjuri dfid = v9fs_fid_lookup(dentry->d_parent); 541bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) { 542bd238fb4SLatchesar Ionkov err = PTR_ERR(dfid); 5436d27e64dSVenkateswararao Jujjuri P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 5446d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 545bd238fb4SLatchesar Ionkov } 546bd238fb4SLatchesar Ionkov 547bd238fb4SLatchesar Ionkov /* clone a fid to use for creation */ 548bd238fb4SLatchesar Ionkov ofid = p9_client_walk(dfid, 0, NULL, 1); 549bd238fb4SLatchesar Ionkov if (IS_ERR(ofid)) { 550bd238fb4SLatchesar Ionkov err = PTR_ERR(ofid); 55151a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 5526d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 553bd238fb4SLatchesar Ionkov } 554bd238fb4SLatchesar Ionkov 555bd238fb4SLatchesar Ionkov err = p9_client_fcreate(ofid, name, perm, mode, extension); 55651a87c55SEric Van Hensbergen if (err < 0) { 55751a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 558bd238fb4SLatchesar Ionkov goto error; 55951a87c55SEric Van Hensbergen } 560bd238fb4SLatchesar Ionkov 561bd238fb4SLatchesar Ionkov /* now walk from the parent so we can get unopened fid */ 5626d27e64dSVenkateswararao Jujjuri fid = p9_client_walk(dfid, 1, &name, 1); 563bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 564bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 56551a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 566bd238fb4SLatchesar Ionkov fid = NULL; 567bd238fb4SLatchesar Ionkov goto error; 5686d27e64dSVenkateswararao Jujjuri } 569bd238fb4SLatchesar Ionkov 570bd238fb4SLatchesar Ionkov /* instantiate inode and assign the unopened fid to the dentry */ 571a78ce05dSAneesh Kumar K.V inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 572bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 573bd238fb4SLatchesar Ionkov err = PTR_ERR(inode); 57451a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); 575bd238fb4SLatchesar Ionkov goto error; 576bd238fb4SLatchesar Ionkov } 577bd238fb4SLatchesar Ionkov d_instantiate(dentry, inode); 57850fb6d2bSAbhishek Kulkarni err = v9fs_fid_add(dentry, fid); 57950fb6d2bSAbhishek Kulkarni if (err < 0) 58050fb6d2bSAbhishek Kulkarni goto error; 58150fb6d2bSAbhishek Kulkarni 582bd238fb4SLatchesar Ionkov return ofid; 583bd238fb4SLatchesar Ionkov 584bd238fb4SLatchesar Ionkov error: 585bd238fb4SLatchesar Ionkov if (ofid) 586bd238fb4SLatchesar Ionkov p9_client_clunk(ofid); 587bd238fb4SLatchesar Ionkov 588bd238fb4SLatchesar Ionkov if (fid) 589bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 590bd238fb4SLatchesar Ionkov 591bd238fb4SLatchesar Ionkov return ERR_PTR(err); 592bd238fb4SLatchesar Ionkov } 593bd238fb4SLatchesar Ionkov 5942bad8471SEric Van Hensbergen /** 5952bad8471SEric Van Hensbergen * v9fs_vfs_create - VFS hook to create files 596ee443996SEric Van Hensbergen * @dir: directory inode that is being created 5972bad8471SEric Van Hensbergen * @dentry: dentry that is being deleted 5986a3124a3SLatchesar Ionkov * @mode: create permissions 5992bad8471SEric Van Hensbergen * @nd: path information 6002bad8471SEric Van Hensbergen * 6012bad8471SEric Van Hensbergen */ 6022bad8471SEric Van Hensbergen 6032bad8471SEric Van Hensbergen static int 6046a3124a3SLatchesar Ionkov v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 6052bad8471SEric Van Hensbergen struct nameidata *nd) 6062bad8471SEric Van Hensbergen { 6076a3124a3SLatchesar Ionkov int err; 608bd238fb4SLatchesar Ionkov u32 perm; 6096a3124a3SLatchesar Ionkov int flags; 6106a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 6113cf387d7SAneesh Kumar K.V struct p9_fid *fid, *inode_fid; 6126a3124a3SLatchesar Ionkov struct file *filp; 6136a3124a3SLatchesar Ionkov 614bd238fb4SLatchesar Ionkov err = 0; 615bd238fb4SLatchesar Ionkov fid = NULL; 6166a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 617da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 6186a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) 6196a3124a3SLatchesar Ionkov flags = nd->intent.open.flags - 1; 6206a3124a3SLatchesar Ionkov else 6216a3124a3SLatchesar Ionkov flags = O_RDWR; 6226a3124a3SLatchesar Ionkov 623bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 624dd6102fbSSripathi Kodi v9fs_uflags2omode(flags, 625dd6102fbSSripathi Kodi v9fs_proto_dotu(v9ses))); 626bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 627bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 628bd238fb4SLatchesar Ionkov fid = NULL; 6296a3124a3SLatchesar Ionkov goto error; 6306a3124a3SLatchesar Ionkov } 6316a3124a3SLatchesar Ionkov 632bd238fb4SLatchesar Ionkov /* if we are opening a file, assign the open fid to the file */ 6336a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) { 6343cf387d7SAneesh Kumar K.V if (v9ses->cache && !dentry->d_inode->i_private) { 6353cf387d7SAneesh Kumar K.V /* 6363cf387d7SAneesh Kumar K.V * clone a fid and add it to inode->i_private 6373cf387d7SAneesh Kumar K.V * we do it during open time instead of 6383cf387d7SAneesh Kumar K.V * page dirty time via write_begin/page_mkwrite 6393cf387d7SAneesh Kumar K.V * because we want write after unlink usecase 6403cf387d7SAneesh Kumar K.V * to work. 6413cf387d7SAneesh Kumar K.V */ 6423cf387d7SAneesh Kumar K.V inode_fid = v9fs_writeback_fid(dentry); 6433cf387d7SAneesh Kumar K.V if (IS_ERR(inode_fid)) { 6443cf387d7SAneesh Kumar K.V err = PTR_ERR(inode_fid); 6453cf387d7SAneesh Kumar K.V goto error; 6463cf387d7SAneesh Kumar K.V } 6473cf387d7SAneesh Kumar K.V dentry->d_inode->i_private = (void *) inode_fid; 6483cf387d7SAneesh Kumar K.V } 649877cb3d4SAneesh Kumar K.V filp = lookup_instantiate_filp(nd, dentry, generic_file_open); 6506a3124a3SLatchesar Ionkov if (IS_ERR(filp)) { 651bd238fb4SLatchesar Ionkov err = PTR_ERR(filp); 652bd238fb4SLatchesar Ionkov goto error; 6536a3124a3SLatchesar Ionkov } 6546a3124a3SLatchesar Ionkov 655bd238fb4SLatchesar Ionkov filp->private_data = fid; 65646848de0SAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 65746848de0SAneesh Kumar K.V if (v9ses->cache) 65846848de0SAneesh Kumar K.V v9fs_cache_inode_set_cookie(dentry->d_inode, filp); 65946848de0SAneesh Kumar K.V #endif 660bd238fb4SLatchesar Ionkov } else 661bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6626a3124a3SLatchesar Ionkov 6636a3124a3SLatchesar Ionkov return 0; 6646a3124a3SLatchesar Ionkov 6656a3124a3SLatchesar Ionkov error: 666bd238fb4SLatchesar Ionkov if (fid) 667bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6686a3124a3SLatchesar Ionkov 6696a3124a3SLatchesar Ionkov return err; 6702bad8471SEric Van Hensbergen } 6712bad8471SEric Van Hensbergen 6722bad8471SEric Van Hensbergen /** 6732bad8471SEric Van Hensbergen * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 674ee443996SEric Van Hensbergen * @dir: inode that is being unlinked 6752bad8471SEric Van Hensbergen * @dentry: dentry that is being unlinked 6762bad8471SEric Van Hensbergen * @mode: mode for new directory 6772bad8471SEric Van Hensbergen * 6782bad8471SEric Van Hensbergen */ 6792bad8471SEric Van Hensbergen 6806a3124a3SLatchesar Ionkov static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 6812bad8471SEric Van Hensbergen { 6826a3124a3SLatchesar Ionkov int err; 683bd238fb4SLatchesar Ionkov u32 perm; 6846a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 685bd238fb4SLatchesar Ionkov struct p9_fid *fid; 6866a3124a3SLatchesar Ionkov 687bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 688bd238fb4SLatchesar Ionkov err = 0; 6896a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 6906a3124a3SLatchesar Ionkov perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 691bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 692bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 693bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 694bd238fb4SLatchesar Ionkov fid = NULL; 6956a3124a3SLatchesar Ionkov } 6966a3124a3SLatchesar Ionkov 697bd238fb4SLatchesar Ionkov if (fid) 698bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6996a3124a3SLatchesar Ionkov 7006a3124a3SLatchesar Ionkov return err; 7012bad8471SEric Van Hensbergen } 7022bad8471SEric Van Hensbergen 7032bad8471SEric Van Hensbergen /** 7042bad8471SEric Van Hensbergen * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 7052bad8471SEric Van Hensbergen * @dir: inode that is being walked from 7062bad8471SEric Van Hensbergen * @dentry: dentry that is being walked to? 7072bad8471SEric Van Hensbergen * @nameidata: path data 7082bad8471SEric Van Hensbergen * 7092bad8471SEric Van Hensbergen */ 7102bad8471SEric Van Hensbergen 71153c06f4eSAneesh Kumar K.V struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 7122bad8471SEric Van Hensbergen struct nameidata *nameidata) 7132bad8471SEric Van Hensbergen { 7142bad8471SEric Van Hensbergen struct super_block *sb; 7152bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses; 716bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *fid; 7172bad8471SEric Van Hensbergen struct inode *inode; 718bd238fb4SLatchesar Ionkov char *name; 7192bad8471SEric Van Hensbergen int result = 0; 7202bad8471SEric Van Hensbergen 721bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 722731805b4SLatchesar Ionkov dir, dentry->d_name.name, dentry, nameidata); 7232bad8471SEric Van Hensbergen 72411e9b49bSSripathi Kodi if (dentry->d_name.len > NAME_MAX) 72511e9b49bSSripathi Kodi return ERR_PTR(-ENAMETOOLONG); 72611e9b49bSSripathi Kodi 7272bad8471SEric Van Hensbergen sb = dir->i_sb; 7282bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(dir); 729a534c8d1SAneesh Kumar K.V /* We can walk d_parent because we hold the dir->i_mutex */ 730bd238fb4SLatchesar Ionkov dfid = v9fs_fid_lookup(dentry->d_parent); 731bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) 732e231c2eeSDavid Howells return ERR_CAST(dfid); 7332bad8471SEric Van Hensbergen 734bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 735bd238fb4SLatchesar Ionkov fid = p9_client_walk(dfid, 1, &name, 1); 736bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 737bd238fb4SLatchesar Ionkov result = PTR_ERR(fid); 7382bad8471SEric Van Hensbergen if (result == -ENOENT) { 73985e0df24SAneesh Kumar K.V inode = NULL; 74085e0df24SAneesh Kumar K.V goto inst_out; 7412bad8471SEric Van Hensbergen } 7422bad8471SEric Van Hensbergen 743bd238fb4SLatchesar Ionkov return ERR_PTR(result); 7442bad8471SEric Van Hensbergen } 7452bad8471SEric Van Hensbergen 746a78ce05dSAneesh Kumar K.V inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 747bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 748bd238fb4SLatchesar Ionkov result = PTR_ERR(inode); 749bd238fb4SLatchesar Ionkov inode = NULL; 750bd238fb4SLatchesar Ionkov goto error; 7512bad8471SEric Van Hensbergen } 7522bad8471SEric Van Hensbergen 753bd238fb4SLatchesar Ionkov result = v9fs_fid_add(dentry, fid); 7546a3124a3SLatchesar Ionkov if (result < 0) 7559856af8bSAneesh Kumar K.V goto error_iput; 7566a3124a3SLatchesar Ionkov 75785e0df24SAneesh Kumar K.V inst_out: 7582bad8471SEric Van Hensbergen d_add(dentry, inode); 7592bad8471SEric Van Hensbergen return NULL; 7602bad8471SEric Van Hensbergen 7619856af8bSAneesh Kumar K.V error_iput: 7629856af8bSAneesh Kumar K.V iput(inode); 763bd238fb4SLatchesar Ionkov error: 764bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 765da977b2cSEric Van Hensbergen 7662bad8471SEric Van Hensbergen return ERR_PTR(result); 7672bad8471SEric Van Hensbergen } 7682bad8471SEric Van Hensbergen 7692bad8471SEric Van Hensbergen /** 7702bad8471SEric Van Hensbergen * v9fs_vfs_unlink - VFS unlink hook to delete an inode 7712bad8471SEric Van Hensbergen * @i: inode that is being unlinked 77273c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7732bad8471SEric Van Hensbergen * 7742bad8471SEric Van Hensbergen */ 7752bad8471SEric Van Hensbergen 77653c06f4eSAneesh Kumar K.V int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 7772bad8471SEric Van Hensbergen { 7782bad8471SEric Van Hensbergen return v9fs_remove(i, d, 0); 7792bad8471SEric Van Hensbergen } 7802bad8471SEric Van Hensbergen 7812bad8471SEric Van Hensbergen /** 7822bad8471SEric Van Hensbergen * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 7832bad8471SEric Van Hensbergen * @i: inode that is being unlinked 78473c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7852bad8471SEric Van Hensbergen * 7862bad8471SEric Van Hensbergen */ 7872bad8471SEric Van Hensbergen 78853c06f4eSAneesh Kumar K.V int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 7892bad8471SEric Van Hensbergen { 7902bad8471SEric Van Hensbergen return v9fs_remove(i, d, 1); 7912bad8471SEric Van Hensbergen } 7922bad8471SEric Van Hensbergen 7932bad8471SEric Van Hensbergen /** 7942bad8471SEric Van Hensbergen * v9fs_vfs_rename - VFS hook to rename an inode 7952bad8471SEric Van Hensbergen * @old_dir: old dir inode 7962bad8471SEric Van Hensbergen * @old_dentry: old dentry 7972bad8471SEric Van Hensbergen * @new_dir: new dir inode 7982bad8471SEric Van Hensbergen * @new_dentry: new dentry 7992bad8471SEric Van Hensbergen * 8002bad8471SEric Van Hensbergen */ 8012bad8471SEric Van Hensbergen 80253c06f4eSAneesh Kumar K.V int 8032bad8471SEric Van Hensbergen v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 8042bad8471SEric Van Hensbergen struct inode *new_dir, struct dentry *new_dentry) 8052bad8471SEric Van Hensbergen { 806bd238fb4SLatchesar Ionkov struct inode *old_inode; 807bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 808bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 809bd238fb4SLatchesar Ionkov struct p9_fid *olddirfid; 810bd238fb4SLatchesar Ionkov struct p9_fid *newdirfid; 811bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 812bd238fb4SLatchesar Ionkov int retval; 8132bad8471SEric Van Hensbergen 814bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 815bd238fb4SLatchesar Ionkov retval = 0; 816bd238fb4SLatchesar Ionkov old_inode = old_dentry->d_inode; 817bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(old_inode); 818bd238fb4SLatchesar Ionkov oldfid = v9fs_fid_lookup(old_dentry); 819da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 820da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 821da977b2cSEric Van Hensbergen 822da977b2cSEric Van Hensbergen olddirfid = v9fs_fid_clone(old_dentry->d_parent); 823da977b2cSEric Van Hensbergen if (IS_ERR(olddirfid)) { 824da977b2cSEric Van Hensbergen retval = PTR_ERR(olddirfid); 825bd238fb4SLatchesar Ionkov goto done; 826da977b2cSEric Van Hensbergen } 827da977b2cSEric Van Hensbergen 828da977b2cSEric Van Hensbergen newdirfid = v9fs_fid_clone(new_dentry->d_parent); 829da977b2cSEric Van Hensbergen if (IS_ERR(newdirfid)) { 830da977b2cSEric Van Hensbergen retval = PTR_ERR(newdirfid); 831bd238fb4SLatchesar Ionkov goto clunk_olddir; 8322bad8471SEric Van Hensbergen } 8332bad8471SEric Van Hensbergen 834a534c8d1SAneesh Kumar K.V down_write(&v9ses->rename_sem); 8354681dbdaSSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 8364681dbdaSSripathi Kodi retval = p9_client_rename(oldfid, newdirfid, 8374681dbdaSSripathi Kodi (char *) new_dentry->d_name.name); 8384681dbdaSSripathi Kodi if (retval != -ENOSYS) 8394681dbdaSSripathi Kodi goto clunk_newdir; 8404681dbdaSSripathi Kodi } 841a534c8d1SAneesh Kumar K.V if (old_dentry->d_parent != new_dentry->d_parent) { 842a534c8d1SAneesh Kumar K.V /* 843a534c8d1SAneesh Kumar K.V * 9P .u can only handle file rename in the same directory 844a534c8d1SAneesh Kumar K.V */ 8454681dbdaSSripathi Kodi 846bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 847bd238fb4SLatchesar Ionkov "old dir and new dir are different\n"); 848621997cdSEric Van Hensbergen retval = -EXDEV; 849bd238fb4SLatchesar Ionkov goto clunk_newdir; 8502bad8471SEric Van Hensbergen } 851531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 852ba17674fSLatchesar Ionkov wstat.muid = v9ses->uname; 853531b1094SLatchesar Ionkov wstat.name = (char *) new_dentry->d_name.name; 854bd238fb4SLatchesar Ionkov retval = p9_client_wstat(oldfid, &wstat); 8552bad8471SEric Van Hensbergen 856bd238fb4SLatchesar Ionkov clunk_newdir: 857a534c8d1SAneesh Kumar K.V if (!retval) 858a534c8d1SAneesh Kumar K.V /* successful rename */ 859a534c8d1SAneesh Kumar K.V d_move(old_dentry, new_dentry); 860a534c8d1SAneesh Kumar K.V up_write(&v9ses->rename_sem); 86122150c4fSLatchesar Ionkov p9_client_clunk(newdirfid); 8622bad8471SEric Van Hensbergen 863bd238fb4SLatchesar Ionkov clunk_olddir: 86422150c4fSLatchesar Ionkov p9_client_clunk(olddirfid); 8652bad8471SEric Van Hensbergen 866bd238fb4SLatchesar Ionkov done: 8672bad8471SEric Van Hensbergen return retval; 8682bad8471SEric Van Hensbergen } 8692bad8471SEric Van Hensbergen 8702bad8471SEric Van Hensbergen /** 871943ffb58SAdrian Bunk * v9fs_vfs_getattr - retrieve file metadata 872ee443996SEric Van Hensbergen * @mnt: mount information 873ee443996SEric Van Hensbergen * @dentry: file to get attributes on 874ee443996SEric Van Hensbergen * @stat: metadata structure to populate 8752bad8471SEric Van Hensbergen * 8762bad8471SEric Van Hensbergen */ 8772bad8471SEric Van Hensbergen 8782bad8471SEric Van Hensbergen static int 8792bad8471SEric Van Hensbergen v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 8802bad8471SEric Van Hensbergen struct kstat *stat) 8812bad8471SEric Van Hensbergen { 882bd238fb4SLatchesar Ionkov int err; 883bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 884bd238fb4SLatchesar Ionkov struct p9_fid *fid; 88551a87c55SEric Van Hensbergen struct p9_wstat *st; 8862bad8471SEric Van Hensbergen 887bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); 888bd238fb4SLatchesar Ionkov err = -EPERM; 889bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 890a1211908SAneesh Kumar K.V if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 891a1211908SAneesh Kumar K.V generic_fillattr(dentry->d_inode, stat); 892a1211908SAneesh Kumar K.V return 0; 893a1211908SAneesh Kumar K.V } 894bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 895da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 896da977b2cSEric Van Hensbergen return PTR_ERR(fid); 8972bad8471SEric Van Hensbergen 898bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 899bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 900bd238fb4SLatchesar Ionkov return PTR_ERR(st); 9012bad8471SEric Van Hensbergen 902bd238fb4SLatchesar Ionkov v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 9032bad8471SEric Van Hensbergen generic_fillattr(dentry->d_inode, stat); 9042bad8471SEric Van Hensbergen 90562b2be59SLatchesar Ionkov p9stat_free(st); 906bd238fb4SLatchesar Ionkov kfree(st); 907bd238fb4SLatchesar Ionkov return 0; 9082bad8471SEric Van Hensbergen } 9092bad8471SEric Van Hensbergen 9102bad8471SEric Van Hensbergen /** 9112bad8471SEric Van Hensbergen * v9fs_vfs_setattr - set file metadata 9122bad8471SEric Van Hensbergen * @dentry: file whose metadata to set 9132bad8471SEric Van Hensbergen * @iattr: metadata assignment structure 9142bad8471SEric Van Hensbergen * 9152bad8471SEric Van Hensbergen */ 9162bad8471SEric Van Hensbergen 9172bad8471SEric Van Hensbergen static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 9182bad8471SEric Van Hensbergen { 919bd238fb4SLatchesar Ionkov int retval; 920bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 921bd238fb4SLatchesar Ionkov struct p9_fid *fid; 922bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 9232bad8471SEric Van Hensbergen 924bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 925bd238fb4SLatchesar Ionkov retval = -EPERM; 926bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 927bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 928da977b2cSEric Van Hensbergen if(IS_ERR(fid)) 929da977b2cSEric Van Hensbergen return PTR_ERR(fid); 9302bad8471SEric Van Hensbergen 931531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 9322bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MODE) 933531b1094SLatchesar Ionkov wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 9342bad8471SEric Van Hensbergen 9352bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MTIME) 936531b1094SLatchesar Ionkov wstat.mtime = iattr->ia_mtime.tv_sec; 9372bad8471SEric Van Hensbergen 9382bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_ATIME) 939531b1094SLatchesar Ionkov wstat.atime = iattr->ia_atime.tv_sec; 9402bad8471SEric Van Hensbergen 9412bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_SIZE) 942531b1094SLatchesar Ionkov wstat.length = iattr->ia_size; 9432bad8471SEric Van Hensbergen 944dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 945531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_UID) 946531b1094SLatchesar Ionkov wstat.n_uid = iattr->ia_uid; 9472bad8471SEric Van Hensbergen 948531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_GID) 949531b1094SLatchesar Ionkov wstat.n_gid = iattr->ia_gid; 9502bad8471SEric Van Hensbergen } 9512bad8471SEric Van Hensbergen 952bd238fb4SLatchesar Ionkov retval = p9_client_wstat(fid, &wstat); 9531025774cSChristoph Hellwig if (retval < 0) 954bd238fb4SLatchesar Ionkov return retval; 9551025774cSChristoph Hellwig 9561025774cSChristoph Hellwig if ((iattr->ia_valid & ATTR_SIZE) && 9571025774cSChristoph Hellwig iattr->ia_size != i_size_read(dentry->d_inode)) { 9581025774cSChristoph Hellwig retval = vmtruncate(dentry->d_inode, iattr->ia_size); 9591025774cSChristoph Hellwig if (retval) 9601025774cSChristoph Hellwig return retval; 9611025774cSChristoph Hellwig } 9621025774cSChristoph Hellwig 9631025774cSChristoph Hellwig setattr_copy(dentry->d_inode, iattr); 9641025774cSChristoph Hellwig mark_inode_dirty(dentry->d_inode); 9651025774cSChristoph Hellwig return 0; 9662bad8471SEric Van Hensbergen } 9672bad8471SEric Van Hensbergen 9682bad8471SEric Van Hensbergen /** 969531b1094SLatchesar Ionkov * v9fs_stat2inode - populate an inode structure with mistat info 970531b1094SLatchesar Ionkov * @stat: Plan 9 metadata (mistat) structure 9712bad8471SEric Van Hensbergen * @inode: inode to populate 9722bad8471SEric Van Hensbergen * @sb: superblock of filesystem 9732bad8471SEric Van Hensbergen * 9742bad8471SEric Van Hensbergen */ 9752bad8471SEric Van Hensbergen 9762bad8471SEric Van Hensbergen void 97751a87c55SEric Van Hensbergen v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 9782bad8471SEric Van Hensbergen struct super_block *sb) 9792bad8471SEric Van Hensbergen { 980531b1094SLatchesar Ionkov char ext[32]; 9815717144aSAneesh Kumar K.V char tag_name[14]; 9825717144aSAneesh Kumar K.V unsigned int i_nlink; 9832bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 9842bad8471SEric Van Hensbergen 9852bad8471SEric Van Hensbergen inode->i_nlink = 1; 9862bad8471SEric Van Hensbergen 987531b1094SLatchesar Ionkov inode->i_atime.tv_sec = stat->atime; 988531b1094SLatchesar Ionkov inode->i_mtime.tv_sec = stat->mtime; 989531b1094SLatchesar Ionkov inode->i_ctime.tv_sec = stat->mtime; 9902bad8471SEric Van Hensbergen 991bd32b82dSLatchesar Ionkov inode->i_uid = v9ses->dfltuid; 992bd32b82dSLatchesar Ionkov inode->i_gid = v9ses->dfltgid; 9932bad8471SEric Van Hensbergen 994dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 995531b1094SLatchesar Ionkov inode->i_uid = stat->n_uid; 996531b1094SLatchesar Ionkov inode->i_gid = stat->n_gid; 997531b1094SLatchesar Ionkov } 9985717144aSAneesh Kumar K.V if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 9995717144aSAneesh Kumar K.V if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 10005717144aSAneesh Kumar K.V /* 10015717144aSAneesh Kumar K.V * Hadlink support got added later to 10025717144aSAneesh Kumar K.V * to the .u extension. So there can be 10035717144aSAneesh Kumar K.V * server out there that doesn't support 10045717144aSAneesh Kumar K.V * this even with .u extension. So check 10055717144aSAneesh Kumar K.V * for non NULL stat->extension 10065717144aSAneesh Kumar K.V */ 10075717144aSAneesh Kumar K.V strncpy(ext, stat->extension, sizeof(ext)); 10085717144aSAneesh Kumar K.V /* HARDLINKCOUNT %u */ 10095717144aSAneesh Kumar K.V sscanf(ext, "%13s %u", tag_name, &i_nlink); 10105717144aSAneesh Kumar K.V if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 10115717144aSAneesh Kumar K.V inode->i_nlink = i_nlink; 10125717144aSAneesh Kumar K.V } 10135717144aSAneesh Kumar K.V } 1014531b1094SLatchesar Ionkov inode->i_mode = p9mode2unixmode(v9ses, stat->mode); 10152bad8471SEric Van Hensbergen if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 10162bad8471SEric Van Hensbergen char type = 0; 10172bad8471SEric Van Hensbergen int major = -1; 10182bad8471SEric Van Hensbergen int minor = -1; 1019531b1094SLatchesar Ionkov 102051a87c55SEric Van Hensbergen strncpy(ext, stat->extension, sizeof(ext)); 1021531b1094SLatchesar Ionkov sscanf(ext, "%c %u %u", &type, &major, &minor); 10222bad8471SEric Van Hensbergen switch (type) { 10232bad8471SEric Van Hensbergen case 'c': 10242bad8471SEric Van Hensbergen inode->i_mode &= ~S_IFBLK; 10252bad8471SEric Van Hensbergen inode->i_mode |= S_IFCHR; 10262bad8471SEric Van Hensbergen break; 10272bad8471SEric Van Hensbergen case 'b': 10282bad8471SEric Van Hensbergen break; 10292bad8471SEric Van Hensbergen default: 1030bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 103151a87c55SEric Van Hensbergen "Unknown special type %c %s\n", type, 103251a87c55SEric Van Hensbergen stat->extension); 10332bad8471SEric Van Hensbergen }; 10342bad8471SEric Van Hensbergen inode->i_rdev = MKDEV(major, minor); 103557c7b4e6SMagnus Deininger init_special_inode(inode, inode->i_mode, inode->i_rdev); 10362bad8471SEric Van Hensbergen } else 10372bad8471SEric Van Hensbergen inode->i_rdev = 0; 10382bad8471SEric Van Hensbergen 10397549ae3eSAbhishek Kulkarni i_size_write(inode, stat->length); 10402bad8471SEric Van Hensbergen 1041bd238fb4SLatchesar Ionkov /* not real number of blocks, but 512 byte ones ... */ 10427549ae3eSAbhishek Kulkarni inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 10432bad8471SEric Van Hensbergen } 10442bad8471SEric Van Hensbergen 10452bad8471SEric Van Hensbergen /** 10462bad8471SEric Van Hensbergen * v9fs_qid2ino - convert qid into inode number 10472bad8471SEric Van Hensbergen * @qid: qid to hash 10482bad8471SEric Van Hensbergen * 10492bad8471SEric Van Hensbergen * BUG: potential for inode number collisions? 10502bad8471SEric Van Hensbergen */ 10512bad8471SEric Van Hensbergen 1052bd238fb4SLatchesar Ionkov ino_t v9fs_qid2ino(struct p9_qid *qid) 10532bad8471SEric Van Hensbergen { 10542bad8471SEric Van Hensbergen u64 path = qid->path + 2; 10552bad8471SEric Van Hensbergen ino_t i = 0; 10562bad8471SEric Van Hensbergen 10572bad8471SEric Van Hensbergen if (sizeof(ino_t) == sizeof(path)) 10582bad8471SEric Van Hensbergen memcpy(&i, &path, sizeof(ino_t)); 10592bad8471SEric Van Hensbergen else 10602bad8471SEric Van Hensbergen i = (ino_t) (path ^ (path >> 32)); 10612bad8471SEric Van Hensbergen 10622bad8471SEric Van Hensbergen return i; 10632bad8471SEric Van Hensbergen } 10642bad8471SEric Van Hensbergen 10652bad8471SEric Van Hensbergen /** 10662bad8471SEric Van Hensbergen * v9fs_readlink - read a symlink's location (internal version) 10672bad8471SEric Van Hensbergen * @dentry: dentry for symlink 106873c592b9SEric Van Hensbergen * @buffer: buffer to load symlink location into 10692bad8471SEric Van Hensbergen * @buflen: length of buffer 10702bad8471SEric Van Hensbergen * 10712bad8471SEric Van Hensbergen */ 10722bad8471SEric Van Hensbergen 10732bad8471SEric Van Hensbergen static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 10742bad8471SEric Van Hensbergen { 1075bd238fb4SLatchesar Ionkov int retval; 10762bad8471SEric Van Hensbergen 1077bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1078bd238fb4SLatchesar Ionkov struct p9_fid *fid; 107951a87c55SEric Van Hensbergen struct p9_wstat *st; 10802bad8471SEric Van Hensbergen 1081bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 1082bd238fb4SLatchesar Ionkov retval = -EPERM; 1083bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 1084bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1085da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 1086da977b2cSEric Van Hensbergen return PTR_ERR(fid); 10872bad8471SEric Van Hensbergen 1088329176ccSM. Mohan Kumar if (!v9fs_proto_dotu(v9ses)) 1089bd238fb4SLatchesar Ionkov return -EBADF; 10902bad8471SEric Van Hensbergen 1091bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 1092bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 1093bd238fb4SLatchesar Ionkov return PTR_ERR(st); 10942bad8471SEric Van Hensbergen 1095bd238fb4SLatchesar Ionkov if (!(st->mode & P9_DMSYMLINK)) { 10962bad8471SEric Van Hensbergen retval = -EINVAL; 1097bd238fb4SLatchesar Ionkov goto done; 10982bad8471SEric Van Hensbergen } 10992bad8471SEric Van Hensbergen 11002bad8471SEric Van Hensbergen /* copy extension buffer into buffer */ 110151a87c55SEric Van Hensbergen strncpy(buffer, st->extension, buflen); 11022bad8471SEric Van Hensbergen 1103bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 110451a87c55SEric Van Hensbergen "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); 1105bd238fb4SLatchesar Ionkov 11062511cd0bSMartin Stava retval = strnlen(buffer, buflen); 1107bd238fb4SLatchesar Ionkov done: 110862b2be59SLatchesar Ionkov p9stat_free(st); 1109bd238fb4SLatchesar Ionkov kfree(st); 11102bad8471SEric Van Hensbergen return retval; 11112bad8471SEric Van Hensbergen } 11122bad8471SEric Van Hensbergen 11132bad8471SEric Van Hensbergen /** 11142bad8471SEric Van Hensbergen * v9fs_vfs_follow_link - follow a symlink path 11152bad8471SEric Van Hensbergen * @dentry: dentry for symlink 11162bad8471SEric Van Hensbergen * @nd: nameidata 11172bad8471SEric Van Hensbergen * 11182bad8471SEric Van Hensbergen */ 11192bad8471SEric Van Hensbergen 11202bad8471SEric Van Hensbergen static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 11212bad8471SEric Van Hensbergen { 11222bad8471SEric Van Hensbergen int len = 0; 11232bad8471SEric Van Hensbergen char *link = __getname(); 11242bad8471SEric Van Hensbergen 1125bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); 11262bad8471SEric Van Hensbergen 11272bad8471SEric Van Hensbergen if (!link) 11282bad8471SEric Van Hensbergen link = ERR_PTR(-ENOMEM); 11292bad8471SEric Van Hensbergen else { 113016cce6d2SLatchesar Ionkov len = v9fs_readlink(dentry, link, PATH_MAX); 11312bad8471SEric Van Hensbergen 11322bad8471SEric Van Hensbergen if (len < 0) { 1133ce44eeb6SDavi Arnaut __putname(link); 11342bad8471SEric Van Hensbergen link = ERR_PTR(len); 11352bad8471SEric Van Hensbergen } else 11362511cd0bSMartin Stava link[min(len, PATH_MAX-1)] = 0; 11372bad8471SEric Van Hensbergen } 11382bad8471SEric Van Hensbergen nd_set_link(nd, link); 11392bad8471SEric Van Hensbergen 11402bad8471SEric Van Hensbergen return NULL; 11412bad8471SEric Van Hensbergen } 11422bad8471SEric Van Hensbergen 11432bad8471SEric Van Hensbergen /** 11442bad8471SEric Van Hensbergen * v9fs_vfs_put_link - release a symlink path 11452bad8471SEric Van Hensbergen * @dentry: dentry for symlink 11462bad8471SEric Van Hensbergen * @nd: nameidata 1147ee443996SEric Van Hensbergen * @p: unused 11482bad8471SEric Van Hensbergen * 11492bad8471SEric Van Hensbergen */ 11502bad8471SEric Van Hensbergen 115153c06f4eSAneesh Kumar K.V void 1152ee443996SEric Van Hensbergen v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 11532bad8471SEric Van Hensbergen { 11542bad8471SEric Van Hensbergen char *s = nd_get_link(nd); 11552bad8471SEric Van Hensbergen 11566ff23207SDuane Griffin P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, 11576ff23207SDuane Griffin IS_ERR(s) ? "<error>" : s); 11582bad8471SEric Van Hensbergen if (!IS_ERR(s)) 1159ce44eeb6SDavi Arnaut __putname(s); 11602bad8471SEric Van Hensbergen } 11612bad8471SEric Van Hensbergen 1162ee443996SEric Van Hensbergen /** 1163ee443996SEric Van Hensbergen * v9fs_vfs_mkspecial - create a special file 1164ee443996SEric Van Hensbergen * @dir: inode to create special file in 1165ee443996SEric Van Hensbergen * @dentry: dentry to create 1166ee443996SEric Van Hensbergen * @mode: mode to create special file 1167ee443996SEric Van Hensbergen * @extension: 9p2000.u format extension string representing special file 1168ee443996SEric Van Hensbergen * 1169ee443996SEric Van Hensbergen */ 1170ee443996SEric Van Hensbergen 1171531b1094SLatchesar Ionkov static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1172531b1094SLatchesar Ionkov int mode, const char *extension) 1173531b1094SLatchesar Ionkov { 1174bd238fb4SLatchesar Ionkov u32 perm; 1175531b1094SLatchesar Ionkov struct v9fs_session_info *v9ses; 1176bd238fb4SLatchesar Ionkov struct p9_fid *fid; 1177531b1094SLatchesar Ionkov 11786a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 1179dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) { 1180bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); 11816a3124a3SLatchesar Ionkov return -EPERM; 1182531b1094SLatchesar Ionkov } 1183531b1094SLatchesar Ionkov 1184da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 1185bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1186bd238fb4SLatchesar Ionkov P9_OREAD); 1187bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) 1188bd238fb4SLatchesar Ionkov return PTR_ERR(fid); 1189da977b2cSEric Van Hensbergen 1190bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 11916a3124a3SLatchesar Ionkov return 0; 1192531b1094SLatchesar Ionkov } 1193531b1094SLatchesar Ionkov 1194531b1094SLatchesar Ionkov /** 1195531b1094SLatchesar Ionkov * v9fs_vfs_symlink - helper function to create symlinks 1196531b1094SLatchesar Ionkov * @dir: directory inode containing symlink 1197531b1094SLatchesar Ionkov * @dentry: dentry for symlink 1198531b1094SLatchesar Ionkov * @symname: symlink data 1199531b1094SLatchesar Ionkov * 1200ee443996SEric Van Hensbergen * See Also: 9P2000.u RFC for more information 1201531b1094SLatchesar Ionkov * 1202531b1094SLatchesar Ionkov */ 1203531b1094SLatchesar Ionkov 1204531b1094SLatchesar Ionkov static int 1205531b1094SLatchesar Ionkov v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1206531b1094SLatchesar Ionkov { 1207bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, 1208bd238fb4SLatchesar Ionkov dentry->d_name.name, symname); 1209531b1094SLatchesar Ionkov 1210531b1094SLatchesar Ionkov return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1211531b1094SLatchesar Ionkov } 1212531b1094SLatchesar Ionkov 12132bad8471SEric Van Hensbergen /** 12142bad8471SEric Van Hensbergen * v9fs_vfs_link - create a hardlink 12152bad8471SEric Van Hensbergen * @old_dentry: dentry for file to link to 12162bad8471SEric Van Hensbergen * @dir: inode destination for new link 121773c592b9SEric Van Hensbergen * @dentry: dentry for link 12182bad8471SEric Van Hensbergen * 12192bad8471SEric Van Hensbergen */ 12202bad8471SEric Van Hensbergen 12212bad8471SEric Van Hensbergen static int 12222bad8471SEric Van Hensbergen v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 12232bad8471SEric Van Hensbergen struct dentry *dentry) 12242bad8471SEric Van Hensbergen { 1225531b1094SLatchesar Ionkov int retval; 1226bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 1227531b1094SLatchesar Ionkov char *name; 12282bad8471SEric Van Hensbergen 1229bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1230bd238fb4SLatchesar Ionkov " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 12312bad8471SEric Van Hensbergen old_dentry->d_name.name); 12322bad8471SEric Van Hensbergen 1233da977b2cSEric Van Hensbergen oldfid = v9fs_fid_clone(old_dentry); 1234da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 1235da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 12362bad8471SEric Van Hensbergen 1237531b1094SLatchesar Ionkov name = __getname(); 1238da977b2cSEric Van Hensbergen if (unlikely(!name)) { 1239da977b2cSEric Van Hensbergen retval = -ENOMEM; 1240da977b2cSEric Van Hensbergen goto clunk_fid; 1241da977b2cSEric Van Hensbergen } 12420710d36aSFlorin Malita 124316cce6d2SLatchesar Ionkov sprintf(name, "%d\n", oldfid->fid); 1244bd238fb4SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1245531b1094SLatchesar Ionkov __putname(name); 12462bad8471SEric Van Hensbergen 1247da977b2cSEric Van Hensbergen clunk_fid: 1248bd238fb4SLatchesar Ionkov p9_client_clunk(oldfid); 12492bad8471SEric Van Hensbergen return retval; 12502bad8471SEric Van Hensbergen } 12512bad8471SEric Van Hensbergen 12522bad8471SEric Van Hensbergen /** 12532bad8471SEric Van Hensbergen * v9fs_vfs_mknod - create a special file 12542bad8471SEric Van Hensbergen * @dir: inode destination for new link 12552bad8471SEric Van Hensbergen * @dentry: dentry for file 12562bad8471SEric Van Hensbergen * @mode: mode for creation 1257ee443996SEric Van Hensbergen * @rdev: device associated with special file 12582bad8471SEric Van Hensbergen * 12592bad8471SEric Van Hensbergen */ 12602bad8471SEric Van Hensbergen 12612bad8471SEric Van Hensbergen static int 12622bad8471SEric Van Hensbergen v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 12632bad8471SEric Van Hensbergen { 1264531b1094SLatchesar Ionkov int retval; 1265531b1094SLatchesar Ionkov char *name; 12662bad8471SEric Van Hensbergen 1267bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1268bd238fb4SLatchesar Ionkov " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 12692bad8471SEric Van Hensbergen dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 12702bad8471SEric Van Hensbergen 1271531b1094SLatchesar Ionkov if (!new_valid_dev(rdev)) 1272531b1094SLatchesar Ionkov return -EINVAL; 127373c592b9SEric Van Hensbergen 1274531b1094SLatchesar Ionkov name = __getname(); 1275c0291a05SEugene Teo if (!name) 1276c0291a05SEugene Teo return -ENOMEM; 12772bad8471SEric Van Hensbergen /* build extension */ 12782bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 1279531b1094SLatchesar Ionkov sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 12802bad8471SEric Van Hensbergen else if (S_ISCHR(mode)) 1281531b1094SLatchesar Ionkov sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 128273c592b9SEric Van Hensbergen else if (S_ISFIFO(mode)) 1283531b1094SLatchesar Ionkov *name = 0; 128475cc5c9bSVenkateswararao Jujjuri else if (S_ISSOCK(mode)) 128575cc5c9bSVenkateswararao Jujjuri *name = 0; 12862bad8471SEric Van Hensbergen else { 1287531b1094SLatchesar Ionkov __putname(name); 1288531b1094SLatchesar Ionkov return -EINVAL; 12892bad8471SEric Van Hensbergen } 12902bad8471SEric Van Hensbergen 1291531b1094SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1292531b1094SLatchesar Ionkov __putname(name); 12932bad8471SEric Van Hensbergen 12942bad8471SEric Van Hensbergen return retval; 12952bad8471SEric Van Hensbergen } 12962bad8471SEric Van Hensbergen 12979b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotu = { 12989b6533c9SSripathi Kodi .create = v9fs_vfs_create, 12999b6533c9SSripathi Kodi .lookup = v9fs_vfs_lookup, 13009b6533c9SSripathi Kodi .symlink = v9fs_vfs_symlink, 130150cc42ffSVenkateswararao Jujjuri (JV) .link = v9fs_vfs_link, 13029b6533c9SSripathi Kodi .unlink = v9fs_vfs_unlink, 13039b6533c9SSripathi Kodi .mkdir = v9fs_vfs_mkdir, 13049b6533c9SSripathi Kodi .rmdir = v9fs_vfs_rmdir, 13051d76e313SAneesh Kumar K.V .mknod = v9fs_vfs_mknod, 13069b6533c9SSripathi Kodi .rename = v9fs_vfs_rename, 13079b6533c9SSripathi Kodi .getattr = v9fs_vfs_getattr, 13089b6533c9SSripathi Kodi .setattr = v9fs_vfs_setattr, 13099b6533c9SSripathi Kodi }; 13109b6533c9SSripathi Kodi 1311754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations = { 1312b501611aSEric Van Hensbergen .create = v9fs_vfs_create, 1313b501611aSEric Van Hensbergen .lookup = v9fs_vfs_lookup, 1314b501611aSEric Van Hensbergen .unlink = v9fs_vfs_unlink, 1315b501611aSEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 1316b501611aSEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 1317b501611aSEric Van Hensbergen .mknod = v9fs_vfs_mknod, 1318b501611aSEric Van Hensbergen .rename = v9fs_vfs_rename, 1319b501611aSEric Van Hensbergen .getattr = v9fs_vfs_getattr, 1320b501611aSEric Van Hensbergen .setattr = v9fs_vfs_setattr, 1321b501611aSEric Van Hensbergen }; 1322b501611aSEric Van Hensbergen 1323754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations = { 13242bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 13252bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 13262bad8471SEric Van Hensbergen }; 13272bad8471SEric Van Hensbergen 1328754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations = { 1329204f2f0eSAl Viro .readlink = generic_readlink, 13302bad8471SEric Van Hensbergen .follow_link = v9fs_vfs_follow_link, 13312bad8471SEric Van Hensbergen .put_link = v9fs_vfs_put_link, 13322bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 13332bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 13342bad8471SEric Van Hensbergen }; 13359b6533c9SSripathi Kodi 1336