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 2226b39f6d2SAneesh Kumar K.V v9inode->writeback_fid = NULL; 223a78ce05dSAneesh Kumar K.V return &v9inode->vfs_inode; 22460e78d2cSAbhishek Kulkarni } 22560e78d2cSAbhishek Kulkarni 22660e78d2cSAbhishek Kulkarni /** 22760e78d2cSAbhishek Kulkarni * v9fs_destroy_inode - destroy an inode 22860e78d2cSAbhishek Kulkarni * 22960e78d2cSAbhishek Kulkarni */ 23060e78d2cSAbhishek Kulkarni 231fa0d7e3dSNick Piggin static void v9fs_i_callback(struct rcu_head *head) 232fa0d7e3dSNick Piggin { 233fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 234fa0d7e3dSNick Piggin INIT_LIST_HEAD(&inode->i_dentry); 235a78ce05dSAneesh Kumar K.V kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 236fa0d7e3dSNick Piggin } 237fa0d7e3dSNick Piggin 23860e78d2cSAbhishek Kulkarni void v9fs_destroy_inode(struct inode *inode) 23960e78d2cSAbhishek Kulkarni { 240fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, v9fs_i_callback); 24160e78d2cSAbhishek Kulkarni } 24260e78d2cSAbhishek Kulkarni 2435ffc0cb3SAneesh Kumar K.V int v9fs_init_inode(struct v9fs_session_info *v9ses, 2445ffc0cb3SAneesh Kumar K.V struct inode *inode, int mode) 2452bad8471SEric Van Hensbergen { 2465ffc0cb3SAneesh Kumar K.V int err = 0; 2472bb54115SAbhishek Kulkarni 248217f206dSDmitry Monakhov inode_init_owner(inode, NULL, mode); 2492bad8471SEric Van Hensbergen inode->i_blocks = 0; 2502bad8471SEric Van Hensbergen inode->i_rdev = 0; 2512bad8471SEric Van Hensbergen inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 252147b31cfSEric Van Hensbergen inode->i_mapping->a_ops = &v9fs_addr_operations; 2532bad8471SEric Van Hensbergen 2542bad8471SEric Van Hensbergen switch (mode & S_IFMT) { 2552bad8471SEric Van Hensbergen case S_IFIFO: 2562bad8471SEric Van Hensbergen case S_IFBLK: 2572bad8471SEric Van Hensbergen case S_IFCHR: 2582bad8471SEric Van Hensbergen case S_IFSOCK: 2594b43516aSM. Mohan Kumar if (v9fs_proto_dotl(v9ses)) { 2604b43516aSM. Mohan Kumar inode->i_op = &v9fs_file_inode_operations_dotl; 2614b43516aSM. Mohan Kumar inode->i_fop = &v9fs_file_operations_dotl; 2624b43516aSM. Mohan Kumar } else if (v9fs_proto_dotu(v9ses)) { 2634b43516aSM. Mohan Kumar inode->i_op = &v9fs_file_inode_operations; 2644b43516aSM. Mohan Kumar inode->i_fop = &v9fs_file_operations; 2654b43516aSM. Mohan Kumar } else { 266bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 267bd238fb4SLatchesar Ionkov "special files without extended mode\n"); 2682bb54115SAbhishek Kulkarni err = -EINVAL; 2692bb54115SAbhishek Kulkarni goto error; 270b501611aSEric Van Hensbergen } 2712bb54115SAbhishek Kulkarni init_special_inode(inode, inode->i_mode, inode->i_rdev); 2725d58bec5SEric Van Hensbergen break; 2732bad8471SEric Van Hensbergen case S_IFREG: 2749b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 2759b6533c9SSripathi Kodi inode->i_op = &v9fs_file_inode_operations_dotl; 27629236f4eSAneesh Kumar K.V if (v9ses->cache) 27729236f4eSAneesh Kumar K.V inode->i_fop = 27829236f4eSAneesh Kumar K.V &v9fs_cached_file_operations_dotl; 27929236f4eSAneesh Kumar K.V else 2809b6533c9SSripathi Kodi inode->i_fop = &v9fs_file_operations_dotl; 2819b6533c9SSripathi Kodi } else { 2822bad8471SEric Van Hensbergen inode->i_op = &v9fs_file_inode_operations; 28329236f4eSAneesh Kumar K.V if (v9ses->cache) 28429236f4eSAneesh Kumar K.V inode->i_fop = &v9fs_cached_file_operations; 28529236f4eSAneesh Kumar K.V else 2862bad8471SEric Van Hensbergen inode->i_fop = &v9fs_file_operations; 2879b6533c9SSripathi Kodi } 2889b6533c9SSripathi Kodi 2892bad8471SEric Van Hensbergen break; 290b501611aSEric Van Hensbergen case S_IFLNK: 2919b6533c9SSripathi Kodi if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 2929b6533c9SSripathi Kodi P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " 2939b6533c9SSripathi Kodi "legacy protocol.\n"); 2942bb54115SAbhishek Kulkarni err = -EINVAL; 2952bb54115SAbhishek Kulkarni goto error; 296b501611aSEric Van Hensbergen } 2979b6533c9SSripathi Kodi 2989b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 2999b6533c9SSripathi Kodi inode->i_op = &v9fs_symlink_inode_operations_dotl; 3009b6533c9SSripathi Kodi else 301b501611aSEric Van Hensbergen inode->i_op = &v9fs_symlink_inode_operations; 3029b6533c9SSripathi Kodi 303b501611aSEric Van Hensbergen break; 3042bad8471SEric Van Hensbergen case S_IFDIR: 305d8c76e6fSDave Hansen inc_nlink(inode); 3069b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3079b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotl; 3089b6533c9SSripathi Kodi else if (v9fs_proto_dotu(v9ses)) 3099b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotu; 310b501611aSEric Van Hensbergen else 3112bad8471SEric Van Hensbergen inode->i_op = &v9fs_dir_inode_operations; 3129b6533c9SSripathi Kodi 3139b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3149b6533c9SSripathi Kodi inode->i_fop = &v9fs_dir_operations_dotl; 3159b6533c9SSripathi Kodi else 3162bad8471SEric Van Hensbergen inode->i_fop = &v9fs_dir_operations; 3179b6533c9SSripathi Kodi 3182bad8471SEric Van Hensbergen break; 3192bad8471SEric Van Hensbergen default: 3202bb54115SAbhishek Kulkarni P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 3212bad8471SEric Van Hensbergen mode, mode & S_IFMT); 3222bb54115SAbhishek Kulkarni err = -EINVAL; 3232bb54115SAbhishek Kulkarni goto error; 3242bad8471SEric Van Hensbergen } 3252bb54115SAbhishek Kulkarni error: 3265ffc0cb3SAneesh Kumar K.V return err; 3275ffc0cb3SAneesh Kumar K.V 3285ffc0cb3SAneesh Kumar K.V } 3295ffc0cb3SAneesh Kumar K.V 3305ffc0cb3SAneesh Kumar K.V /** 3315ffc0cb3SAneesh Kumar K.V * v9fs_get_inode - helper function to setup an inode 3325ffc0cb3SAneesh Kumar K.V * @sb: superblock 3335ffc0cb3SAneesh Kumar K.V * @mode: mode to setup inode with 3345ffc0cb3SAneesh Kumar K.V * 3355ffc0cb3SAneesh Kumar K.V */ 3365ffc0cb3SAneesh Kumar K.V 3375ffc0cb3SAneesh Kumar K.V struct inode *v9fs_get_inode(struct super_block *sb, int mode) 3385ffc0cb3SAneesh Kumar K.V { 3395ffc0cb3SAneesh Kumar K.V int err; 3405ffc0cb3SAneesh Kumar K.V struct inode *inode; 3415ffc0cb3SAneesh Kumar K.V struct v9fs_session_info *v9ses = sb->s_fs_info; 3425ffc0cb3SAneesh Kumar K.V 3435ffc0cb3SAneesh Kumar K.V P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 3445ffc0cb3SAneesh Kumar K.V 3455ffc0cb3SAneesh Kumar K.V inode = new_inode(sb); 3465ffc0cb3SAneesh Kumar K.V if (!inode) { 3475ffc0cb3SAneesh Kumar K.V P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); 3485ffc0cb3SAneesh Kumar K.V return ERR_PTR(-ENOMEM); 3495ffc0cb3SAneesh Kumar K.V } 3505ffc0cb3SAneesh Kumar K.V err = v9fs_init_inode(v9ses, inode, mode); 3515ffc0cb3SAneesh Kumar K.V if (err) { 3522bb54115SAbhishek Kulkarni iput(inode); 3532bb54115SAbhishek Kulkarni return ERR_PTR(err); 3542bad8471SEric Van Hensbergen } 3555ffc0cb3SAneesh Kumar K.V return inode; 3565ffc0cb3SAneesh Kumar K.V } 3572bad8471SEric Van Hensbergen 358bd238fb4SLatchesar Ionkov /* 3596a3124a3SLatchesar Ionkov static struct v9fs_fid* 3606a3124a3SLatchesar Ionkov v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 3616a3124a3SLatchesar Ionkov { 3626a3124a3SLatchesar Ionkov int err; 363736c4b85SMika Kukkonen int nfid; 3646a3124a3SLatchesar Ionkov struct v9fs_fid *ret; 3656a3124a3SLatchesar Ionkov struct v9fs_fcall *fcall; 3660b8dd177SLatchesar Ionkov 3676a3124a3SLatchesar Ionkov nfid = v9fs_get_idpool(&v9ses->fidpool); 3686a3124a3SLatchesar Ionkov if (nfid < 0) { 3690b8dd177SLatchesar Ionkov eprintk(KERN_WARNING, "no free fids available\n"); 370731805b4SLatchesar Ionkov return ERR_PTR(-ENOSPC); 3710b8dd177SLatchesar Ionkov } 3720b8dd177SLatchesar Ionkov 3736a3124a3SLatchesar Ionkov err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 3746a3124a3SLatchesar Ionkov &fcall); 3756a3124a3SLatchesar Ionkov 3766a3124a3SLatchesar Ionkov if (err < 0) { 37741e5a6acSLatchesar Ionkov if (fcall && fcall->id == RWALK) 37841e5a6acSLatchesar Ionkov goto clunk_fid; 37941e5a6acSLatchesar Ionkov 3806a3124a3SLatchesar Ionkov PRINT_FCALL_ERROR("walk error", fcall); 3816a3124a3SLatchesar Ionkov v9fs_put_idpool(nfid, &v9ses->fidpool); 3826a3124a3SLatchesar Ionkov goto error; 3830b8dd177SLatchesar Ionkov } 3846a3124a3SLatchesar Ionkov 3853cf6429aSLatchesar Ionkov kfree(fcall); 3863cf6429aSLatchesar Ionkov fcall = NULL; 3876a3124a3SLatchesar Ionkov ret = v9fs_fid_create(v9ses, nfid); 3886a3124a3SLatchesar Ionkov if (!ret) { 3896a3124a3SLatchesar Ionkov err = -ENOMEM; 3906a3124a3SLatchesar Ionkov goto clunk_fid; 3910b8dd177SLatchesar Ionkov } 3922bad8471SEric Van Hensbergen 3936a3124a3SLatchesar Ionkov err = v9fs_fid_insert(ret, dentry); 3946a3124a3SLatchesar Ionkov if (err < 0) { 3956a3124a3SLatchesar Ionkov v9fs_fid_destroy(ret); 3966a3124a3SLatchesar Ionkov goto clunk_fid; 3976a3124a3SLatchesar Ionkov } 3982bad8471SEric Van Hensbergen 3996a3124a3SLatchesar Ionkov return ret; 4006a3124a3SLatchesar Ionkov 4016a3124a3SLatchesar Ionkov clunk_fid: 4026a3124a3SLatchesar Ionkov v9fs_t_clunk(v9ses, nfid); 4036a3124a3SLatchesar Ionkov 4046a3124a3SLatchesar Ionkov error: 4056a3124a3SLatchesar Ionkov kfree(fcall); 4066a3124a3SLatchesar Ionkov return ERR_PTR(err); 4076a3124a3SLatchesar Ionkov } 408bd238fb4SLatchesar Ionkov */ 4096a3124a3SLatchesar Ionkov 41060e78d2cSAbhishek Kulkarni 41160e78d2cSAbhishek Kulkarni /** 41260e78d2cSAbhishek Kulkarni * v9fs_clear_inode - release an inode 41360e78d2cSAbhishek Kulkarni * @inode: inode to release 41460e78d2cSAbhishek Kulkarni * 41560e78d2cSAbhishek Kulkarni */ 416b57922d9SAl Viro void v9fs_evict_inode(struct inode *inode) 41760e78d2cSAbhishek Kulkarni { 4186b39f6d2SAneesh Kumar K.V struct v9fs_inode *v9inode = V9FS_I(inode); 4196b39f6d2SAneesh Kumar K.V 420b57922d9SAl Viro truncate_inode_pages(inode->i_mapping, 0); 421b57922d9SAl Viro end_writeback(inode); 42260e78d2cSAbhishek Kulkarni filemap_fdatawrite(inode->i_mapping); 42360e78d2cSAbhishek Kulkarni 42460e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 42560e78d2cSAbhishek Kulkarni v9fs_cache_inode_put_cookie(inode); 42660e78d2cSAbhishek Kulkarni #endif 4276b39f6d2SAneesh Kumar K.V /* clunk the fid stashed in writeback_fid */ 4286b39f6d2SAneesh Kumar K.V if (v9inode->writeback_fid) { 4296b39f6d2SAneesh Kumar K.V p9_client_clunk(v9inode->writeback_fid); 4306b39f6d2SAneesh Kumar K.V v9inode->writeback_fid = NULL; 4313cf387d7SAneesh Kumar K.V } 43260e78d2cSAbhishek Kulkarni } 43360e78d2cSAbhishek Kulkarni 4345ffc0cb3SAneesh Kumar K.V static struct inode *v9fs_qid_iget(struct super_block *sb, 4355ffc0cb3SAneesh Kumar K.V struct p9_qid *qid, 4365ffc0cb3SAneesh Kumar K.V struct p9_wstat *st) 4375ffc0cb3SAneesh Kumar K.V { 4385ffc0cb3SAneesh Kumar K.V int retval, umode; 4395ffc0cb3SAneesh Kumar K.V unsigned long i_ino; 4405ffc0cb3SAneesh Kumar K.V struct inode *inode; 4415ffc0cb3SAneesh Kumar K.V struct v9fs_session_info *v9ses = sb->s_fs_info; 4425ffc0cb3SAneesh Kumar K.V 4435ffc0cb3SAneesh Kumar K.V i_ino = v9fs_qid2ino(qid); 4445ffc0cb3SAneesh Kumar K.V inode = iget_locked(sb, i_ino); 4455ffc0cb3SAneesh Kumar K.V if (!inode) 4465ffc0cb3SAneesh Kumar K.V return ERR_PTR(-ENOMEM); 4475ffc0cb3SAneesh Kumar K.V if (!(inode->i_state & I_NEW)) 4485ffc0cb3SAneesh Kumar K.V return inode; 4495ffc0cb3SAneesh Kumar K.V /* 4505ffc0cb3SAneesh Kumar K.V * initialize the inode with the stat info 4515ffc0cb3SAneesh Kumar K.V * FIXME!! we may need support for stale inodes 4525ffc0cb3SAneesh Kumar K.V * later. 4535ffc0cb3SAneesh Kumar K.V */ 4545ffc0cb3SAneesh Kumar K.V umode = p9mode2unixmode(v9ses, st->mode); 4555ffc0cb3SAneesh Kumar K.V retval = v9fs_init_inode(v9ses, inode, umode); 4565ffc0cb3SAneesh Kumar K.V if (retval) 4575ffc0cb3SAneesh Kumar K.V goto error; 4585ffc0cb3SAneesh Kumar K.V 4595ffc0cb3SAneesh Kumar K.V v9fs_stat2inode(st, inode, sb); 4605ffc0cb3SAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 461a78ce05dSAneesh Kumar K.V v9fs_fscache_set_key(inode, &st->qid); 4625ffc0cb3SAneesh Kumar K.V v9fs_cache_inode_get_cookie(inode); 4635ffc0cb3SAneesh Kumar K.V #endif 4645ffc0cb3SAneesh Kumar K.V unlock_new_inode(inode); 4655ffc0cb3SAneesh Kumar K.V return inode; 4665ffc0cb3SAneesh Kumar K.V error: 4675ffc0cb3SAneesh Kumar K.V unlock_new_inode(inode); 4685ffc0cb3SAneesh Kumar K.V iput(inode); 4695ffc0cb3SAneesh Kumar K.V return ERR_PTR(retval); 4705ffc0cb3SAneesh Kumar K.V 4715ffc0cb3SAneesh Kumar K.V } 4725ffc0cb3SAneesh Kumar K.V 47353c06f4eSAneesh Kumar K.V struct inode * 474a78ce05dSAneesh Kumar K.V v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 4756a3124a3SLatchesar Ionkov struct super_block *sb) 4766a3124a3SLatchesar Ionkov { 47751a87c55SEric Van Hensbergen struct p9_wstat *st; 4785ffc0cb3SAneesh Kumar K.V struct inode *inode = NULL; 4796a3124a3SLatchesar Ionkov 480bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 48102bc3567SAbhishek Kulkarni if (IS_ERR(st)) 48202bc3567SAbhishek Kulkarni return ERR_CAST(st); 4832bad8471SEric Van Hensbergen 4845ffc0cb3SAneesh Kumar K.V inode = v9fs_qid_iget(sb, &st->qid, st); 48502bc3567SAbhishek Kulkarni p9stat_free(st); 486bd238fb4SLatchesar Ionkov kfree(st); 4875ffc0cb3SAneesh Kumar K.V return inode; 4882bad8471SEric Van Hensbergen } 4892bad8471SEric Van Hensbergen 4902bad8471SEric Van Hensbergen /** 4912bad8471SEric Van Hensbergen * v9fs_remove - helper function to remove files and directories 49273c592b9SEric Van Hensbergen * @dir: directory inode that is being deleted 49373c592b9SEric Van Hensbergen * @file: dentry that is being deleted 49473c592b9SEric Van Hensbergen * @rmdir: removing a directory 4952bad8471SEric Van Hensbergen * 4962bad8471SEric Van Hensbergen */ 4972bad8471SEric Van Hensbergen 4982bad8471SEric Van Hensbergen static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) 4992bad8471SEric Van Hensbergen { 500d994f405SAneesh Kumar K.V int retval; 501bd238fb4SLatchesar Ionkov struct inode *file_inode; 502bd238fb4SLatchesar Ionkov struct p9_fid *v9fid; 5032bad8471SEric Van Hensbergen 504bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, 5052bad8471SEric Van Hensbergen rmdir); 5062bad8471SEric Van Hensbergen 5072bad8471SEric Van Hensbergen file_inode = file->d_inode; 508c959df9fSLatchesar Ionkov v9fid = v9fs_fid_clone(file); 509da977b2cSEric Van Hensbergen if (IS_ERR(v9fid)) 510da977b2cSEric Van Hensbergen return PTR_ERR(v9fid); 5112bad8471SEric Van Hensbergen 512d994f405SAneesh Kumar K.V retval = p9_client_remove(v9fid); 513d994f405SAneesh Kumar K.V if (!retval) 514d994f405SAneesh Kumar K.V drop_nlink(file_inode); 515d994f405SAneesh Kumar K.V return retval; 5162bad8471SEric Van Hensbergen } 5172bad8471SEric Van Hensbergen 518bd238fb4SLatchesar Ionkov /** 519bd238fb4SLatchesar Ionkov * v9fs_create - Create a file 520ee443996SEric Van Hensbergen * @v9ses: session information 521ee443996SEric Van Hensbergen * @dir: directory that dentry is being created in 522bd238fb4SLatchesar Ionkov * @dentry: dentry that is being created 5230e15597eSAbhishek Kulkarni * @extension: 9p2000.u extension string to support devices, etc. 524bd238fb4SLatchesar Ionkov * @perm: create permissions 525bd238fb4SLatchesar Ionkov * @mode: open mode 526bd238fb4SLatchesar Ionkov * 527bd238fb4SLatchesar Ionkov */ 528bd238fb4SLatchesar Ionkov static struct p9_fid * 529bd238fb4SLatchesar Ionkov v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 530bd238fb4SLatchesar Ionkov struct dentry *dentry, char *extension, u32 perm, u8 mode) 531bd238fb4SLatchesar Ionkov { 532bd238fb4SLatchesar Ionkov int err; 533bd238fb4SLatchesar Ionkov char *name; 534bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *ofid, *fid; 535bd238fb4SLatchesar Ionkov struct inode *inode; 536bd238fb4SLatchesar Ionkov 53751a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 53851a87c55SEric Van Hensbergen 539bd238fb4SLatchesar Ionkov err = 0; 540bd238fb4SLatchesar Ionkov ofid = NULL; 541bd238fb4SLatchesar Ionkov fid = NULL; 542bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 5436d27e64dSVenkateswararao Jujjuri dfid = v9fs_fid_lookup(dentry->d_parent); 544bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) { 545bd238fb4SLatchesar Ionkov err = PTR_ERR(dfid); 5466d27e64dSVenkateswararao Jujjuri P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 5476d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 548bd238fb4SLatchesar Ionkov } 549bd238fb4SLatchesar Ionkov 550bd238fb4SLatchesar Ionkov /* clone a fid to use for creation */ 551bd238fb4SLatchesar Ionkov ofid = p9_client_walk(dfid, 0, NULL, 1); 552bd238fb4SLatchesar Ionkov if (IS_ERR(ofid)) { 553bd238fb4SLatchesar Ionkov err = PTR_ERR(ofid); 55451a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 5556d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 556bd238fb4SLatchesar Ionkov } 557bd238fb4SLatchesar Ionkov 558bd238fb4SLatchesar Ionkov err = p9_client_fcreate(ofid, name, perm, mode, extension); 55951a87c55SEric Van Hensbergen if (err < 0) { 56051a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 561bd238fb4SLatchesar Ionkov goto error; 56251a87c55SEric Van Hensbergen } 563bd238fb4SLatchesar Ionkov 564bd238fb4SLatchesar Ionkov /* now walk from the parent so we can get unopened fid */ 5656d27e64dSVenkateswararao Jujjuri fid = p9_client_walk(dfid, 1, &name, 1); 566bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 567bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 56851a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 569bd238fb4SLatchesar Ionkov fid = NULL; 570bd238fb4SLatchesar Ionkov goto error; 5716d27e64dSVenkateswararao Jujjuri } 572bd238fb4SLatchesar Ionkov 573bd238fb4SLatchesar Ionkov /* instantiate inode and assign the unopened fid to the dentry */ 574a78ce05dSAneesh Kumar K.V inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 575bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 576bd238fb4SLatchesar Ionkov err = PTR_ERR(inode); 57751a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); 578bd238fb4SLatchesar Ionkov goto error; 579bd238fb4SLatchesar Ionkov } 580bd238fb4SLatchesar Ionkov d_instantiate(dentry, inode); 58150fb6d2bSAbhishek Kulkarni err = v9fs_fid_add(dentry, fid); 58250fb6d2bSAbhishek Kulkarni if (err < 0) 58350fb6d2bSAbhishek Kulkarni goto error; 58450fb6d2bSAbhishek Kulkarni 585bd238fb4SLatchesar Ionkov return ofid; 586bd238fb4SLatchesar Ionkov 587bd238fb4SLatchesar Ionkov error: 588bd238fb4SLatchesar Ionkov if (ofid) 589bd238fb4SLatchesar Ionkov p9_client_clunk(ofid); 590bd238fb4SLatchesar Ionkov 591bd238fb4SLatchesar Ionkov if (fid) 592bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 593bd238fb4SLatchesar Ionkov 594bd238fb4SLatchesar Ionkov return ERR_PTR(err); 595bd238fb4SLatchesar Ionkov } 596bd238fb4SLatchesar Ionkov 5972bad8471SEric Van Hensbergen /** 5982bad8471SEric Van Hensbergen * v9fs_vfs_create - VFS hook to create files 599ee443996SEric Van Hensbergen * @dir: directory inode that is being created 6002bad8471SEric Van Hensbergen * @dentry: dentry that is being deleted 6016a3124a3SLatchesar Ionkov * @mode: create permissions 6022bad8471SEric Van Hensbergen * @nd: path information 6032bad8471SEric Van Hensbergen * 6042bad8471SEric Van Hensbergen */ 6052bad8471SEric Van Hensbergen 6062bad8471SEric Van Hensbergen static int 6076a3124a3SLatchesar Ionkov v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 6082bad8471SEric Van Hensbergen struct nameidata *nd) 6092bad8471SEric Van Hensbergen { 6106a3124a3SLatchesar Ionkov int err; 611bd238fb4SLatchesar Ionkov u32 perm; 6126a3124a3SLatchesar Ionkov int flags; 6136b39f6d2SAneesh Kumar K.V struct file *filp; 6146b39f6d2SAneesh Kumar K.V struct v9fs_inode *v9inode; 6156a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 6163cf387d7SAneesh Kumar K.V struct p9_fid *fid, *inode_fid; 6176a3124a3SLatchesar Ionkov 618bd238fb4SLatchesar Ionkov err = 0; 619bd238fb4SLatchesar Ionkov fid = NULL; 6206a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 621da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 6226a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) 6236a3124a3SLatchesar Ionkov flags = nd->intent.open.flags - 1; 6246a3124a3SLatchesar Ionkov else 6256a3124a3SLatchesar Ionkov flags = O_RDWR; 6266a3124a3SLatchesar Ionkov 627bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 628dd6102fbSSripathi Kodi v9fs_uflags2omode(flags, 629dd6102fbSSripathi Kodi v9fs_proto_dotu(v9ses))); 630bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 631bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 632bd238fb4SLatchesar Ionkov fid = NULL; 6336a3124a3SLatchesar Ionkov goto error; 6346a3124a3SLatchesar Ionkov } 6356a3124a3SLatchesar Ionkov 636bd238fb4SLatchesar Ionkov /* if we are opening a file, assign the open fid to the file */ 6376a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) { 6386b39f6d2SAneesh Kumar K.V v9inode = V9FS_I(dentry->d_inode); 6396b39f6d2SAneesh Kumar K.V if (v9ses->cache && !v9inode->writeback_fid) { 6403cf387d7SAneesh Kumar K.V /* 6416b39f6d2SAneesh Kumar K.V * clone a fid and add it to writeback_fid 6423cf387d7SAneesh Kumar K.V * we do it during open time instead of 6433cf387d7SAneesh Kumar K.V * page dirty time via write_begin/page_mkwrite 6443cf387d7SAneesh Kumar K.V * because we want write after unlink usecase 6453cf387d7SAneesh Kumar K.V * to work. 6463cf387d7SAneesh Kumar K.V */ 6473cf387d7SAneesh Kumar K.V inode_fid = v9fs_writeback_fid(dentry); 6483cf387d7SAneesh Kumar K.V if (IS_ERR(inode_fid)) { 6493cf387d7SAneesh Kumar K.V err = PTR_ERR(inode_fid); 6503cf387d7SAneesh Kumar K.V goto error; 6513cf387d7SAneesh Kumar K.V } 6526b39f6d2SAneesh Kumar K.V v9inode->writeback_fid = (void *) inode_fid; 6533cf387d7SAneesh Kumar K.V } 654877cb3d4SAneesh Kumar K.V filp = lookup_instantiate_filp(nd, dentry, generic_file_open); 6556a3124a3SLatchesar Ionkov if (IS_ERR(filp)) { 656bd238fb4SLatchesar Ionkov err = PTR_ERR(filp); 657bd238fb4SLatchesar Ionkov goto error; 6586a3124a3SLatchesar Ionkov } 6596a3124a3SLatchesar Ionkov 660bd238fb4SLatchesar Ionkov filp->private_data = fid; 66146848de0SAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 66246848de0SAneesh Kumar K.V if (v9ses->cache) 66346848de0SAneesh Kumar K.V v9fs_cache_inode_set_cookie(dentry->d_inode, filp); 66446848de0SAneesh Kumar K.V #endif 665bd238fb4SLatchesar Ionkov } else 666bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6676a3124a3SLatchesar Ionkov 6686a3124a3SLatchesar Ionkov return 0; 6696a3124a3SLatchesar Ionkov 6706a3124a3SLatchesar Ionkov error: 671bd238fb4SLatchesar Ionkov if (fid) 672bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6736a3124a3SLatchesar Ionkov 6746a3124a3SLatchesar Ionkov return err; 6752bad8471SEric Van Hensbergen } 6762bad8471SEric Van Hensbergen 6772bad8471SEric Van Hensbergen /** 6782bad8471SEric Van Hensbergen * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 679ee443996SEric Van Hensbergen * @dir: inode that is being unlinked 6802bad8471SEric Van Hensbergen * @dentry: dentry that is being unlinked 6812bad8471SEric Van Hensbergen * @mode: mode for new directory 6822bad8471SEric Van Hensbergen * 6832bad8471SEric Van Hensbergen */ 6842bad8471SEric Van Hensbergen 6856a3124a3SLatchesar Ionkov static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 6862bad8471SEric Van Hensbergen { 6876a3124a3SLatchesar Ionkov int err; 688bd238fb4SLatchesar Ionkov u32 perm; 6896a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 690bd238fb4SLatchesar Ionkov struct p9_fid *fid; 6916a3124a3SLatchesar Ionkov 692bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 693bd238fb4SLatchesar Ionkov err = 0; 6946a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 6956a3124a3SLatchesar Ionkov perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 696bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 697bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 698bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 699bd238fb4SLatchesar Ionkov fid = NULL; 7006a3124a3SLatchesar Ionkov } 7016a3124a3SLatchesar Ionkov 702bd238fb4SLatchesar Ionkov if (fid) 703bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 7046a3124a3SLatchesar Ionkov 7056a3124a3SLatchesar Ionkov return err; 7062bad8471SEric Van Hensbergen } 7072bad8471SEric Van Hensbergen 7082bad8471SEric Van Hensbergen /** 7092bad8471SEric Van Hensbergen * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 7102bad8471SEric Van Hensbergen * @dir: inode that is being walked from 7112bad8471SEric Van Hensbergen * @dentry: dentry that is being walked to? 7122bad8471SEric Van Hensbergen * @nameidata: path data 7132bad8471SEric Van Hensbergen * 7142bad8471SEric Van Hensbergen */ 7152bad8471SEric Van Hensbergen 71653c06f4eSAneesh Kumar K.V struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 7172bad8471SEric Van Hensbergen struct nameidata *nameidata) 7182bad8471SEric Van Hensbergen { 7192bad8471SEric Van Hensbergen struct super_block *sb; 7202bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses; 721bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *fid; 7222bad8471SEric Van Hensbergen struct inode *inode; 723bd238fb4SLatchesar Ionkov char *name; 7242bad8471SEric Van Hensbergen int result = 0; 7252bad8471SEric Van Hensbergen 726bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 727731805b4SLatchesar Ionkov dir, dentry->d_name.name, dentry, nameidata); 7282bad8471SEric Van Hensbergen 72911e9b49bSSripathi Kodi if (dentry->d_name.len > NAME_MAX) 73011e9b49bSSripathi Kodi return ERR_PTR(-ENAMETOOLONG); 73111e9b49bSSripathi Kodi 7322bad8471SEric Van Hensbergen sb = dir->i_sb; 7332bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(dir); 734a534c8d1SAneesh Kumar K.V /* We can walk d_parent because we hold the dir->i_mutex */ 735bd238fb4SLatchesar Ionkov dfid = v9fs_fid_lookup(dentry->d_parent); 736bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) 737e231c2eeSDavid Howells return ERR_CAST(dfid); 7382bad8471SEric Van Hensbergen 739bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 740bd238fb4SLatchesar Ionkov fid = p9_client_walk(dfid, 1, &name, 1); 741bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 742bd238fb4SLatchesar Ionkov result = PTR_ERR(fid); 7432bad8471SEric Van Hensbergen if (result == -ENOENT) { 74485e0df24SAneesh Kumar K.V inode = NULL; 74585e0df24SAneesh Kumar K.V goto inst_out; 7462bad8471SEric Van Hensbergen } 7472bad8471SEric Van Hensbergen 748bd238fb4SLatchesar Ionkov return ERR_PTR(result); 7492bad8471SEric Van Hensbergen } 7502bad8471SEric Van Hensbergen 751a78ce05dSAneesh Kumar K.V inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 752bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 753bd238fb4SLatchesar Ionkov result = PTR_ERR(inode); 754bd238fb4SLatchesar Ionkov inode = NULL; 755bd238fb4SLatchesar Ionkov goto error; 7562bad8471SEric Van Hensbergen } 7572bad8471SEric Van Hensbergen 758bd238fb4SLatchesar Ionkov result = v9fs_fid_add(dentry, fid); 7596a3124a3SLatchesar Ionkov if (result < 0) 7609856af8bSAneesh Kumar K.V goto error_iput; 7616a3124a3SLatchesar Ionkov 76285e0df24SAneesh Kumar K.V inst_out: 7632bad8471SEric Van Hensbergen d_add(dentry, inode); 7642bad8471SEric Van Hensbergen return NULL; 7652bad8471SEric Van Hensbergen 7669856af8bSAneesh Kumar K.V error_iput: 7679856af8bSAneesh Kumar K.V iput(inode); 768bd238fb4SLatchesar Ionkov error: 769bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 770da977b2cSEric Van Hensbergen 7712bad8471SEric Van Hensbergen return ERR_PTR(result); 7722bad8471SEric Van Hensbergen } 7732bad8471SEric Van Hensbergen 7742bad8471SEric Van Hensbergen /** 7752bad8471SEric Van Hensbergen * v9fs_vfs_unlink - VFS unlink hook to delete an inode 7762bad8471SEric Van Hensbergen * @i: inode that is being unlinked 77773c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7782bad8471SEric Van Hensbergen * 7792bad8471SEric Van Hensbergen */ 7802bad8471SEric Van Hensbergen 78153c06f4eSAneesh Kumar K.V int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 7822bad8471SEric Van Hensbergen { 7832bad8471SEric Van Hensbergen return v9fs_remove(i, d, 0); 7842bad8471SEric Van Hensbergen } 7852bad8471SEric Van Hensbergen 7862bad8471SEric Van Hensbergen /** 7872bad8471SEric Van Hensbergen * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 7882bad8471SEric Van Hensbergen * @i: inode that is being unlinked 78973c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7902bad8471SEric Van Hensbergen * 7912bad8471SEric Van Hensbergen */ 7922bad8471SEric Van Hensbergen 79353c06f4eSAneesh Kumar K.V int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 7942bad8471SEric Van Hensbergen { 7952bad8471SEric Van Hensbergen return v9fs_remove(i, d, 1); 7962bad8471SEric Van Hensbergen } 7972bad8471SEric Van Hensbergen 7982bad8471SEric Van Hensbergen /** 7992bad8471SEric Van Hensbergen * v9fs_vfs_rename - VFS hook to rename an inode 8002bad8471SEric Van Hensbergen * @old_dir: old dir inode 8012bad8471SEric Van Hensbergen * @old_dentry: old dentry 8022bad8471SEric Van Hensbergen * @new_dir: new dir inode 8032bad8471SEric Van Hensbergen * @new_dentry: new dentry 8042bad8471SEric Van Hensbergen * 8052bad8471SEric Van Hensbergen */ 8062bad8471SEric Van Hensbergen 80753c06f4eSAneesh Kumar K.V int 8082bad8471SEric Van Hensbergen v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 8092bad8471SEric Van Hensbergen struct inode *new_dir, struct dentry *new_dentry) 8102bad8471SEric Van Hensbergen { 811bd238fb4SLatchesar Ionkov struct inode *old_inode; 812bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 813bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 814bd238fb4SLatchesar Ionkov struct p9_fid *olddirfid; 815bd238fb4SLatchesar Ionkov struct p9_fid *newdirfid; 816bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 817bd238fb4SLatchesar Ionkov int retval; 8182bad8471SEric Van Hensbergen 819bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 820bd238fb4SLatchesar Ionkov retval = 0; 821bd238fb4SLatchesar Ionkov old_inode = old_dentry->d_inode; 822bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(old_inode); 823bd238fb4SLatchesar Ionkov oldfid = v9fs_fid_lookup(old_dentry); 824da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 825da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 826da977b2cSEric Van Hensbergen 827da977b2cSEric Van Hensbergen olddirfid = v9fs_fid_clone(old_dentry->d_parent); 828da977b2cSEric Van Hensbergen if (IS_ERR(olddirfid)) { 829da977b2cSEric Van Hensbergen retval = PTR_ERR(olddirfid); 830bd238fb4SLatchesar Ionkov goto done; 831da977b2cSEric Van Hensbergen } 832da977b2cSEric Van Hensbergen 833da977b2cSEric Van Hensbergen newdirfid = v9fs_fid_clone(new_dentry->d_parent); 834da977b2cSEric Van Hensbergen if (IS_ERR(newdirfid)) { 835da977b2cSEric Van Hensbergen retval = PTR_ERR(newdirfid); 836bd238fb4SLatchesar Ionkov goto clunk_olddir; 8372bad8471SEric Van Hensbergen } 8382bad8471SEric Van Hensbergen 839a534c8d1SAneesh Kumar K.V down_write(&v9ses->rename_sem); 8404681dbdaSSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 8414681dbdaSSripathi Kodi retval = p9_client_rename(oldfid, newdirfid, 8424681dbdaSSripathi Kodi (char *) new_dentry->d_name.name); 8434681dbdaSSripathi Kodi if (retval != -ENOSYS) 8444681dbdaSSripathi Kodi goto clunk_newdir; 8454681dbdaSSripathi Kodi } 846a534c8d1SAneesh Kumar K.V if (old_dentry->d_parent != new_dentry->d_parent) { 847a534c8d1SAneesh Kumar K.V /* 848a534c8d1SAneesh Kumar K.V * 9P .u can only handle file rename in the same directory 849a534c8d1SAneesh Kumar K.V */ 8504681dbdaSSripathi Kodi 851bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 852bd238fb4SLatchesar Ionkov "old dir and new dir are different\n"); 853621997cdSEric Van Hensbergen retval = -EXDEV; 854bd238fb4SLatchesar Ionkov goto clunk_newdir; 8552bad8471SEric Van Hensbergen } 856531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 857ba17674fSLatchesar Ionkov wstat.muid = v9ses->uname; 858531b1094SLatchesar Ionkov wstat.name = (char *) new_dentry->d_name.name; 859bd238fb4SLatchesar Ionkov retval = p9_client_wstat(oldfid, &wstat); 8602bad8471SEric Van Hensbergen 861bd238fb4SLatchesar Ionkov clunk_newdir: 862a534c8d1SAneesh Kumar K.V if (!retval) 863a534c8d1SAneesh Kumar K.V /* successful rename */ 864a534c8d1SAneesh Kumar K.V d_move(old_dentry, new_dentry); 865a534c8d1SAneesh Kumar K.V up_write(&v9ses->rename_sem); 86622150c4fSLatchesar Ionkov p9_client_clunk(newdirfid); 8672bad8471SEric Van Hensbergen 868bd238fb4SLatchesar Ionkov clunk_olddir: 86922150c4fSLatchesar Ionkov p9_client_clunk(olddirfid); 8702bad8471SEric Van Hensbergen 871bd238fb4SLatchesar Ionkov done: 8722bad8471SEric Van Hensbergen return retval; 8732bad8471SEric Van Hensbergen } 8742bad8471SEric Van Hensbergen 8752bad8471SEric Van Hensbergen /** 876943ffb58SAdrian Bunk * v9fs_vfs_getattr - retrieve file metadata 877ee443996SEric Van Hensbergen * @mnt: mount information 878ee443996SEric Van Hensbergen * @dentry: file to get attributes on 879ee443996SEric Van Hensbergen * @stat: metadata structure to populate 8802bad8471SEric Van Hensbergen * 8812bad8471SEric Van Hensbergen */ 8822bad8471SEric Van Hensbergen 8832bad8471SEric Van Hensbergen static int 8842bad8471SEric Van Hensbergen v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 8852bad8471SEric Van Hensbergen struct kstat *stat) 8862bad8471SEric Van Hensbergen { 887bd238fb4SLatchesar Ionkov int err; 888bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 889bd238fb4SLatchesar Ionkov struct p9_fid *fid; 89051a87c55SEric Van Hensbergen struct p9_wstat *st; 8912bad8471SEric Van Hensbergen 892bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); 893bd238fb4SLatchesar Ionkov err = -EPERM; 894bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 895a1211908SAneesh Kumar K.V if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 896a1211908SAneesh Kumar K.V generic_fillattr(dentry->d_inode, stat); 897a1211908SAneesh Kumar K.V return 0; 898a1211908SAneesh Kumar K.V } 899bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 900da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 901da977b2cSEric Van Hensbergen return PTR_ERR(fid); 9022bad8471SEric Van Hensbergen 903bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 904bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 905bd238fb4SLatchesar Ionkov return PTR_ERR(st); 9062bad8471SEric Van Hensbergen 907bd238fb4SLatchesar Ionkov v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 9082bad8471SEric Van Hensbergen generic_fillattr(dentry->d_inode, stat); 9092bad8471SEric Van Hensbergen 91062b2be59SLatchesar Ionkov p9stat_free(st); 911bd238fb4SLatchesar Ionkov kfree(st); 912bd238fb4SLatchesar Ionkov return 0; 9132bad8471SEric Van Hensbergen } 9142bad8471SEric Van Hensbergen 9152bad8471SEric Van Hensbergen /** 9162bad8471SEric Van Hensbergen * v9fs_vfs_setattr - set file metadata 9172bad8471SEric Van Hensbergen * @dentry: file whose metadata to set 9182bad8471SEric Van Hensbergen * @iattr: metadata assignment structure 9192bad8471SEric Van Hensbergen * 9202bad8471SEric Van Hensbergen */ 9212bad8471SEric Van Hensbergen 9222bad8471SEric Van Hensbergen static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 9232bad8471SEric Van Hensbergen { 924bd238fb4SLatchesar Ionkov int retval; 925bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 926bd238fb4SLatchesar Ionkov struct p9_fid *fid; 927bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 9282bad8471SEric Van Hensbergen 929bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 930bd238fb4SLatchesar Ionkov retval = -EPERM; 931bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 932bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 933da977b2cSEric Van Hensbergen if(IS_ERR(fid)) 934da977b2cSEric Van Hensbergen return PTR_ERR(fid); 9352bad8471SEric Van Hensbergen 936531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 9372bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MODE) 938531b1094SLatchesar Ionkov wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 9392bad8471SEric Van Hensbergen 9402bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MTIME) 941531b1094SLatchesar Ionkov wstat.mtime = iattr->ia_mtime.tv_sec; 9422bad8471SEric Van Hensbergen 9432bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_ATIME) 944531b1094SLatchesar Ionkov wstat.atime = iattr->ia_atime.tv_sec; 9452bad8471SEric Van Hensbergen 9462bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_SIZE) 947531b1094SLatchesar Ionkov wstat.length = iattr->ia_size; 9482bad8471SEric Van Hensbergen 949dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 950531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_UID) 951531b1094SLatchesar Ionkov wstat.n_uid = iattr->ia_uid; 9522bad8471SEric Van Hensbergen 953531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_GID) 954531b1094SLatchesar Ionkov wstat.n_gid = iattr->ia_gid; 9552bad8471SEric Van Hensbergen } 9562bad8471SEric Van Hensbergen 957bd238fb4SLatchesar Ionkov retval = p9_client_wstat(fid, &wstat); 9581025774cSChristoph Hellwig if (retval < 0) 959bd238fb4SLatchesar Ionkov return retval; 9601025774cSChristoph Hellwig 9611025774cSChristoph Hellwig if ((iattr->ia_valid & ATTR_SIZE) && 9621025774cSChristoph Hellwig iattr->ia_size != i_size_read(dentry->d_inode)) { 9631025774cSChristoph Hellwig retval = vmtruncate(dentry->d_inode, iattr->ia_size); 9641025774cSChristoph Hellwig if (retval) 9651025774cSChristoph Hellwig return retval; 9661025774cSChristoph Hellwig } 9671025774cSChristoph Hellwig 9681025774cSChristoph Hellwig setattr_copy(dentry->d_inode, iattr); 9691025774cSChristoph Hellwig mark_inode_dirty(dentry->d_inode); 9701025774cSChristoph Hellwig return 0; 9712bad8471SEric Van Hensbergen } 9722bad8471SEric Van Hensbergen 9732bad8471SEric Van Hensbergen /** 974531b1094SLatchesar Ionkov * v9fs_stat2inode - populate an inode structure with mistat info 975531b1094SLatchesar Ionkov * @stat: Plan 9 metadata (mistat) structure 9762bad8471SEric Van Hensbergen * @inode: inode to populate 9772bad8471SEric Van Hensbergen * @sb: superblock of filesystem 9782bad8471SEric Van Hensbergen * 9792bad8471SEric Van Hensbergen */ 9802bad8471SEric Van Hensbergen 9812bad8471SEric Van Hensbergen void 98251a87c55SEric Van Hensbergen v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 9832bad8471SEric Van Hensbergen struct super_block *sb) 9842bad8471SEric Van Hensbergen { 985531b1094SLatchesar Ionkov char ext[32]; 9865717144aSAneesh Kumar K.V char tag_name[14]; 9875717144aSAneesh Kumar K.V unsigned int i_nlink; 9882bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 9892bad8471SEric Van Hensbergen 9902bad8471SEric Van Hensbergen inode->i_nlink = 1; 9912bad8471SEric Van Hensbergen 992531b1094SLatchesar Ionkov inode->i_atime.tv_sec = stat->atime; 993531b1094SLatchesar Ionkov inode->i_mtime.tv_sec = stat->mtime; 994531b1094SLatchesar Ionkov inode->i_ctime.tv_sec = stat->mtime; 9952bad8471SEric Van Hensbergen 996bd32b82dSLatchesar Ionkov inode->i_uid = v9ses->dfltuid; 997bd32b82dSLatchesar Ionkov inode->i_gid = v9ses->dfltgid; 9982bad8471SEric Van Hensbergen 999dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 1000531b1094SLatchesar Ionkov inode->i_uid = stat->n_uid; 1001531b1094SLatchesar Ionkov inode->i_gid = stat->n_gid; 1002531b1094SLatchesar Ionkov } 10035717144aSAneesh Kumar K.V if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 10045717144aSAneesh Kumar K.V if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 10055717144aSAneesh Kumar K.V /* 10065717144aSAneesh Kumar K.V * Hadlink support got added later to 10075717144aSAneesh Kumar K.V * to the .u extension. So there can be 10085717144aSAneesh Kumar K.V * server out there that doesn't support 10095717144aSAneesh Kumar K.V * this even with .u extension. So check 10105717144aSAneesh Kumar K.V * for non NULL stat->extension 10115717144aSAneesh Kumar K.V */ 10125717144aSAneesh Kumar K.V strncpy(ext, stat->extension, sizeof(ext)); 10135717144aSAneesh Kumar K.V /* HARDLINKCOUNT %u */ 10145717144aSAneesh Kumar K.V sscanf(ext, "%13s %u", tag_name, &i_nlink); 10155717144aSAneesh Kumar K.V if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 10165717144aSAneesh Kumar K.V inode->i_nlink = i_nlink; 10175717144aSAneesh Kumar K.V } 10185717144aSAneesh Kumar K.V } 1019531b1094SLatchesar Ionkov inode->i_mode = p9mode2unixmode(v9ses, stat->mode); 10202bad8471SEric Van Hensbergen if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 10212bad8471SEric Van Hensbergen char type = 0; 10222bad8471SEric Van Hensbergen int major = -1; 10232bad8471SEric Van Hensbergen int minor = -1; 1024531b1094SLatchesar Ionkov 102551a87c55SEric Van Hensbergen strncpy(ext, stat->extension, sizeof(ext)); 1026531b1094SLatchesar Ionkov sscanf(ext, "%c %u %u", &type, &major, &minor); 10272bad8471SEric Van Hensbergen switch (type) { 10282bad8471SEric Van Hensbergen case 'c': 10292bad8471SEric Van Hensbergen inode->i_mode &= ~S_IFBLK; 10302bad8471SEric Van Hensbergen inode->i_mode |= S_IFCHR; 10312bad8471SEric Van Hensbergen break; 10322bad8471SEric Van Hensbergen case 'b': 10332bad8471SEric Van Hensbergen break; 10342bad8471SEric Van Hensbergen default: 1035bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 103651a87c55SEric Van Hensbergen "Unknown special type %c %s\n", type, 103751a87c55SEric Van Hensbergen stat->extension); 10382bad8471SEric Van Hensbergen }; 10392bad8471SEric Van Hensbergen inode->i_rdev = MKDEV(major, minor); 104057c7b4e6SMagnus Deininger init_special_inode(inode, inode->i_mode, inode->i_rdev); 10412bad8471SEric Van Hensbergen } else 10422bad8471SEric Van Hensbergen inode->i_rdev = 0; 10432bad8471SEric Van Hensbergen 10447549ae3eSAbhishek Kulkarni i_size_write(inode, stat->length); 10452bad8471SEric Van Hensbergen 1046bd238fb4SLatchesar Ionkov /* not real number of blocks, but 512 byte ones ... */ 10477549ae3eSAbhishek Kulkarni inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 10482bad8471SEric Van Hensbergen } 10492bad8471SEric Van Hensbergen 10502bad8471SEric Van Hensbergen /** 10512bad8471SEric Van Hensbergen * v9fs_qid2ino - convert qid into inode number 10522bad8471SEric Van Hensbergen * @qid: qid to hash 10532bad8471SEric Van Hensbergen * 10542bad8471SEric Van Hensbergen * BUG: potential for inode number collisions? 10552bad8471SEric Van Hensbergen */ 10562bad8471SEric Van Hensbergen 1057bd238fb4SLatchesar Ionkov ino_t v9fs_qid2ino(struct p9_qid *qid) 10582bad8471SEric Van Hensbergen { 10592bad8471SEric Van Hensbergen u64 path = qid->path + 2; 10602bad8471SEric Van Hensbergen ino_t i = 0; 10612bad8471SEric Van Hensbergen 10622bad8471SEric Van Hensbergen if (sizeof(ino_t) == sizeof(path)) 10632bad8471SEric Van Hensbergen memcpy(&i, &path, sizeof(ino_t)); 10642bad8471SEric Van Hensbergen else 10652bad8471SEric Van Hensbergen i = (ino_t) (path ^ (path >> 32)); 10662bad8471SEric Van Hensbergen 10672bad8471SEric Van Hensbergen return i; 10682bad8471SEric Van Hensbergen } 10692bad8471SEric Van Hensbergen 10702bad8471SEric Van Hensbergen /** 10712bad8471SEric Van Hensbergen * v9fs_readlink - read a symlink's location (internal version) 10722bad8471SEric Van Hensbergen * @dentry: dentry for symlink 107373c592b9SEric Van Hensbergen * @buffer: buffer to load symlink location into 10742bad8471SEric Van Hensbergen * @buflen: length of buffer 10752bad8471SEric Van Hensbergen * 10762bad8471SEric Van Hensbergen */ 10772bad8471SEric Van Hensbergen 10782bad8471SEric Van Hensbergen static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 10792bad8471SEric Van Hensbergen { 1080bd238fb4SLatchesar Ionkov int retval; 10812bad8471SEric Van Hensbergen 1082bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1083bd238fb4SLatchesar Ionkov struct p9_fid *fid; 108451a87c55SEric Van Hensbergen struct p9_wstat *st; 10852bad8471SEric Van Hensbergen 1086bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 1087bd238fb4SLatchesar Ionkov retval = -EPERM; 1088bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 1089bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1090da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 1091da977b2cSEric Van Hensbergen return PTR_ERR(fid); 10922bad8471SEric Van Hensbergen 1093329176ccSM. Mohan Kumar if (!v9fs_proto_dotu(v9ses)) 1094bd238fb4SLatchesar Ionkov return -EBADF; 10952bad8471SEric Van Hensbergen 1096bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 1097bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 1098bd238fb4SLatchesar Ionkov return PTR_ERR(st); 10992bad8471SEric Van Hensbergen 1100bd238fb4SLatchesar Ionkov if (!(st->mode & P9_DMSYMLINK)) { 11012bad8471SEric Van Hensbergen retval = -EINVAL; 1102bd238fb4SLatchesar Ionkov goto done; 11032bad8471SEric Van Hensbergen } 11042bad8471SEric Van Hensbergen 11052bad8471SEric Van Hensbergen /* copy extension buffer into buffer */ 110651a87c55SEric Van Hensbergen strncpy(buffer, st->extension, buflen); 11072bad8471SEric Van Hensbergen 1108bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 110951a87c55SEric Van Hensbergen "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); 1110bd238fb4SLatchesar Ionkov 11112511cd0bSMartin Stava retval = strnlen(buffer, buflen); 1112bd238fb4SLatchesar Ionkov done: 111362b2be59SLatchesar Ionkov p9stat_free(st); 1114bd238fb4SLatchesar Ionkov kfree(st); 11152bad8471SEric Van Hensbergen return retval; 11162bad8471SEric Van Hensbergen } 11172bad8471SEric Van Hensbergen 11182bad8471SEric Van Hensbergen /** 11192bad8471SEric Van Hensbergen * v9fs_vfs_follow_link - follow a symlink path 11202bad8471SEric Van Hensbergen * @dentry: dentry for symlink 11212bad8471SEric Van Hensbergen * @nd: nameidata 11222bad8471SEric Van Hensbergen * 11232bad8471SEric Van Hensbergen */ 11242bad8471SEric Van Hensbergen 11252bad8471SEric Van Hensbergen static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 11262bad8471SEric Van Hensbergen { 11272bad8471SEric Van Hensbergen int len = 0; 11282bad8471SEric Van Hensbergen char *link = __getname(); 11292bad8471SEric Van Hensbergen 1130bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); 11312bad8471SEric Van Hensbergen 11322bad8471SEric Van Hensbergen if (!link) 11332bad8471SEric Van Hensbergen link = ERR_PTR(-ENOMEM); 11342bad8471SEric Van Hensbergen else { 113516cce6d2SLatchesar Ionkov len = v9fs_readlink(dentry, link, PATH_MAX); 11362bad8471SEric Van Hensbergen 11372bad8471SEric Van Hensbergen if (len < 0) { 1138ce44eeb6SDavi Arnaut __putname(link); 11392bad8471SEric Van Hensbergen link = ERR_PTR(len); 11402bad8471SEric Van Hensbergen } else 11412511cd0bSMartin Stava link[min(len, PATH_MAX-1)] = 0; 11422bad8471SEric Van Hensbergen } 11432bad8471SEric Van Hensbergen nd_set_link(nd, link); 11442bad8471SEric Van Hensbergen 11452bad8471SEric Van Hensbergen return NULL; 11462bad8471SEric Van Hensbergen } 11472bad8471SEric Van Hensbergen 11482bad8471SEric Van Hensbergen /** 11492bad8471SEric Van Hensbergen * v9fs_vfs_put_link - release a symlink path 11502bad8471SEric Van Hensbergen * @dentry: dentry for symlink 11512bad8471SEric Van Hensbergen * @nd: nameidata 1152ee443996SEric Van Hensbergen * @p: unused 11532bad8471SEric Van Hensbergen * 11542bad8471SEric Van Hensbergen */ 11552bad8471SEric Van Hensbergen 115653c06f4eSAneesh Kumar K.V void 1157ee443996SEric Van Hensbergen v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 11582bad8471SEric Van Hensbergen { 11592bad8471SEric Van Hensbergen char *s = nd_get_link(nd); 11602bad8471SEric Van Hensbergen 11616ff23207SDuane Griffin P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, 11626ff23207SDuane Griffin IS_ERR(s) ? "<error>" : s); 11632bad8471SEric Van Hensbergen if (!IS_ERR(s)) 1164ce44eeb6SDavi Arnaut __putname(s); 11652bad8471SEric Van Hensbergen } 11662bad8471SEric Van Hensbergen 1167ee443996SEric Van Hensbergen /** 1168ee443996SEric Van Hensbergen * v9fs_vfs_mkspecial - create a special file 1169ee443996SEric Van Hensbergen * @dir: inode to create special file in 1170ee443996SEric Van Hensbergen * @dentry: dentry to create 1171ee443996SEric Van Hensbergen * @mode: mode to create special file 1172ee443996SEric Van Hensbergen * @extension: 9p2000.u format extension string representing special file 1173ee443996SEric Van Hensbergen * 1174ee443996SEric Van Hensbergen */ 1175ee443996SEric Van Hensbergen 1176531b1094SLatchesar Ionkov static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1177531b1094SLatchesar Ionkov int mode, const char *extension) 1178531b1094SLatchesar Ionkov { 1179bd238fb4SLatchesar Ionkov u32 perm; 1180531b1094SLatchesar Ionkov struct v9fs_session_info *v9ses; 1181bd238fb4SLatchesar Ionkov struct p9_fid *fid; 1182531b1094SLatchesar Ionkov 11836a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 1184dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) { 1185bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); 11866a3124a3SLatchesar Ionkov return -EPERM; 1187531b1094SLatchesar Ionkov } 1188531b1094SLatchesar Ionkov 1189da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 1190bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1191bd238fb4SLatchesar Ionkov P9_OREAD); 1192bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) 1193bd238fb4SLatchesar Ionkov return PTR_ERR(fid); 1194da977b2cSEric Van Hensbergen 1195bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 11966a3124a3SLatchesar Ionkov return 0; 1197531b1094SLatchesar Ionkov } 1198531b1094SLatchesar Ionkov 1199531b1094SLatchesar Ionkov /** 1200531b1094SLatchesar Ionkov * v9fs_vfs_symlink - helper function to create symlinks 1201531b1094SLatchesar Ionkov * @dir: directory inode containing symlink 1202531b1094SLatchesar Ionkov * @dentry: dentry for symlink 1203531b1094SLatchesar Ionkov * @symname: symlink data 1204531b1094SLatchesar Ionkov * 1205ee443996SEric Van Hensbergen * See Also: 9P2000.u RFC for more information 1206531b1094SLatchesar Ionkov * 1207531b1094SLatchesar Ionkov */ 1208531b1094SLatchesar Ionkov 1209531b1094SLatchesar Ionkov static int 1210531b1094SLatchesar Ionkov v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1211531b1094SLatchesar Ionkov { 1212bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, 1213bd238fb4SLatchesar Ionkov dentry->d_name.name, symname); 1214531b1094SLatchesar Ionkov 1215531b1094SLatchesar Ionkov return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1216531b1094SLatchesar Ionkov } 1217531b1094SLatchesar Ionkov 12182bad8471SEric Van Hensbergen /** 12192bad8471SEric Van Hensbergen * v9fs_vfs_link - create a hardlink 12202bad8471SEric Van Hensbergen * @old_dentry: dentry for file to link to 12212bad8471SEric Van Hensbergen * @dir: inode destination for new link 122273c592b9SEric Van Hensbergen * @dentry: dentry for link 12232bad8471SEric Van Hensbergen * 12242bad8471SEric Van Hensbergen */ 12252bad8471SEric Van Hensbergen 12262bad8471SEric Van Hensbergen static int 12272bad8471SEric Van Hensbergen v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 12282bad8471SEric Van Hensbergen struct dentry *dentry) 12292bad8471SEric Van Hensbergen { 1230531b1094SLatchesar Ionkov int retval; 1231bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 1232531b1094SLatchesar Ionkov char *name; 12332bad8471SEric Van Hensbergen 1234bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1235bd238fb4SLatchesar Ionkov " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 12362bad8471SEric Van Hensbergen old_dentry->d_name.name); 12372bad8471SEric Van Hensbergen 1238da977b2cSEric Van Hensbergen oldfid = v9fs_fid_clone(old_dentry); 1239da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 1240da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 12412bad8471SEric Van Hensbergen 1242531b1094SLatchesar Ionkov name = __getname(); 1243da977b2cSEric Van Hensbergen if (unlikely(!name)) { 1244da977b2cSEric Van Hensbergen retval = -ENOMEM; 1245da977b2cSEric Van Hensbergen goto clunk_fid; 1246da977b2cSEric Van Hensbergen } 12470710d36aSFlorin Malita 124816cce6d2SLatchesar Ionkov sprintf(name, "%d\n", oldfid->fid); 1249bd238fb4SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1250531b1094SLatchesar Ionkov __putname(name); 12512bad8471SEric Van Hensbergen 1252da977b2cSEric Van Hensbergen clunk_fid: 1253bd238fb4SLatchesar Ionkov p9_client_clunk(oldfid); 12542bad8471SEric Van Hensbergen return retval; 12552bad8471SEric Van Hensbergen } 12562bad8471SEric Van Hensbergen 12572bad8471SEric Van Hensbergen /** 12582bad8471SEric Van Hensbergen * v9fs_vfs_mknod - create a special file 12592bad8471SEric Van Hensbergen * @dir: inode destination for new link 12602bad8471SEric Van Hensbergen * @dentry: dentry for file 12612bad8471SEric Van Hensbergen * @mode: mode for creation 1262ee443996SEric Van Hensbergen * @rdev: device associated with special file 12632bad8471SEric Van Hensbergen * 12642bad8471SEric Van Hensbergen */ 12652bad8471SEric Van Hensbergen 12662bad8471SEric Van Hensbergen static int 12672bad8471SEric Van Hensbergen v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 12682bad8471SEric Van Hensbergen { 1269531b1094SLatchesar Ionkov int retval; 1270531b1094SLatchesar Ionkov char *name; 12712bad8471SEric Van Hensbergen 1272bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1273bd238fb4SLatchesar Ionkov " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 12742bad8471SEric Van Hensbergen dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 12752bad8471SEric Van Hensbergen 1276531b1094SLatchesar Ionkov if (!new_valid_dev(rdev)) 1277531b1094SLatchesar Ionkov return -EINVAL; 127873c592b9SEric Van Hensbergen 1279531b1094SLatchesar Ionkov name = __getname(); 1280c0291a05SEugene Teo if (!name) 1281c0291a05SEugene Teo return -ENOMEM; 12822bad8471SEric Van Hensbergen /* build extension */ 12832bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 1284531b1094SLatchesar Ionkov sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 12852bad8471SEric Van Hensbergen else if (S_ISCHR(mode)) 1286531b1094SLatchesar Ionkov sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 128773c592b9SEric Van Hensbergen else if (S_ISFIFO(mode)) 1288531b1094SLatchesar Ionkov *name = 0; 128975cc5c9bSVenkateswararao Jujjuri else if (S_ISSOCK(mode)) 129075cc5c9bSVenkateswararao Jujjuri *name = 0; 12912bad8471SEric Van Hensbergen else { 1292531b1094SLatchesar Ionkov __putname(name); 1293531b1094SLatchesar Ionkov return -EINVAL; 12942bad8471SEric Van Hensbergen } 12952bad8471SEric Van Hensbergen 1296531b1094SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1297531b1094SLatchesar Ionkov __putname(name); 12982bad8471SEric Van Hensbergen 12992bad8471SEric Van Hensbergen return retval; 13002bad8471SEric Van Hensbergen } 13012bad8471SEric Van Hensbergen 13029b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotu = { 13039b6533c9SSripathi Kodi .create = v9fs_vfs_create, 13049b6533c9SSripathi Kodi .lookup = v9fs_vfs_lookup, 13059b6533c9SSripathi Kodi .symlink = v9fs_vfs_symlink, 130650cc42ffSVenkateswararao Jujjuri (JV) .link = v9fs_vfs_link, 13079b6533c9SSripathi Kodi .unlink = v9fs_vfs_unlink, 13089b6533c9SSripathi Kodi .mkdir = v9fs_vfs_mkdir, 13099b6533c9SSripathi Kodi .rmdir = v9fs_vfs_rmdir, 13101d76e313SAneesh Kumar K.V .mknod = v9fs_vfs_mknod, 13119b6533c9SSripathi Kodi .rename = v9fs_vfs_rename, 13129b6533c9SSripathi Kodi .getattr = v9fs_vfs_getattr, 13139b6533c9SSripathi Kodi .setattr = v9fs_vfs_setattr, 13149b6533c9SSripathi Kodi }; 13159b6533c9SSripathi Kodi 1316754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations = { 1317b501611aSEric Van Hensbergen .create = v9fs_vfs_create, 1318b501611aSEric Van Hensbergen .lookup = v9fs_vfs_lookup, 1319b501611aSEric Van Hensbergen .unlink = v9fs_vfs_unlink, 1320b501611aSEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 1321b501611aSEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 1322b501611aSEric Van Hensbergen .mknod = v9fs_vfs_mknod, 1323b501611aSEric Van Hensbergen .rename = v9fs_vfs_rename, 1324b501611aSEric Van Hensbergen .getattr = v9fs_vfs_getattr, 1325b501611aSEric Van Hensbergen .setattr = v9fs_vfs_setattr, 1326b501611aSEric Van Hensbergen }; 1327b501611aSEric Van Hensbergen 1328754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations = { 13292bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 13302bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 13312bad8471SEric Van Hensbergen }; 13322bad8471SEric Van Hensbergen 1333754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations = { 1334204f2f0eSAl Viro .readlink = generic_readlink, 13352bad8471SEric Van Hensbergen .follow_link = v9fs_vfs_follow_link, 13362bad8471SEric Van Hensbergen .put_link = v9fs_vfs_put_link, 13372bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 13382bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 13392bad8471SEric Van Hensbergen }; 13409b6533c9SSripathi Kodi 1341