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> 38bd238fb4SLatchesar Ionkov #include <net/9p/9p.h> 39bd238fb4SLatchesar Ionkov #include <net/9p/client.h> 402bad8471SEric Van Hensbergen 412bad8471SEric Van Hensbergen #include "v9fs.h" 422bad8471SEric Van Hensbergen #include "v9fs_vfs.h" 432bad8471SEric Van Hensbergen #include "fid.h" 4460e78d2cSAbhishek Kulkarni #include "cache.h" 452bad8471SEric Van Hensbergen 46754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations; 479b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotu; 489b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotl; 49754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations; 509b6533c9SSripathi Kodi static const struct inode_operations v9fs_file_inode_operations_dotl; 51754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations; 529b6533c9SSripathi Kodi static const struct inode_operations v9fs_symlink_inode_operations_dotl; 532bad8471SEric Van Hensbergen 542bad8471SEric Van Hensbergen /** 552bad8471SEric Van Hensbergen * unixmode2p9mode - convert unix mode bits to plan 9 562bad8471SEric Van Hensbergen * @v9ses: v9fs session information 572bad8471SEric Van Hensbergen * @mode: mode to convert 582bad8471SEric Van Hensbergen * 592bad8471SEric Van Hensbergen */ 602bad8471SEric Van Hensbergen 6173c592b9SEric Van Hensbergen static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) 622bad8471SEric Van Hensbergen { 632bad8471SEric Van Hensbergen int res; 642bad8471SEric Van Hensbergen res = mode & 0777; 652bad8471SEric Van Hensbergen if (S_ISDIR(mode)) 66bd238fb4SLatchesar Ionkov res |= P9_DMDIR; 67dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 682bad8471SEric Van Hensbergen if (S_ISLNK(mode)) 69bd238fb4SLatchesar Ionkov res |= P9_DMSYMLINK; 702bad8471SEric Van Hensbergen if (v9ses->nodev == 0) { 712bad8471SEric Van Hensbergen if (S_ISSOCK(mode)) 72bd238fb4SLatchesar Ionkov res |= P9_DMSOCKET; 732bad8471SEric Van Hensbergen if (S_ISFIFO(mode)) 74bd238fb4SLatchesar Ionkov res |= P9_DMNAMEDPIPE; 752bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 76bd238fb4SLatchesar Ionkov res |= P9_DMDEVICE; 772bad8471SEric Van Hensbergen if (S_ISCHR(mode)) 78bd238fb4SLatchesar Ionkov res |= P9_DMDEVICE; 792bad8471SEric Van Hensbergen } 802bad8471SEric Van Hensbergen 812bad8471SEric Van Hensbergen if ((mode & S_ISUID) == S_ISUID) 82bd238fb4SLatchesar Ionkov res |= P9_DMSETUID; 832bad8471SEric Van Hensbergen if ((mode & S_ISGID) == S_ISGID) 84bd238fb4SLatchesar Ionkov res |= P9_DMSETGID; 85d199d652SAnthony Liguori if ((mode & S_ISVTX) == S_ISVTX) 86d199d652SAnthony Liguori res |= P9_DMSETVTX; 87bd238fb4SLatchesar Ionkov if ((mode & P9_DMLINK)) 88bd238fb4SLatchesar Ionkov res |= P9_DMLINK; 892bad8471SEric Van Hensbergen } 902bad8471SEric Van Hensbergen 912bad8471SEric Van Hensbergen return res; 922bad8471SEric Van Hensbergen } 932bad8471SEric Van Hensbergen 942bad8471SEric Van Hensbergen /** 952bad8471SEric Van Hensbergen * p9mode2unixmode- convert plan9 mode bits to unix mode bits 962bad8471SEric Van Hensbergen * @v9ses: v9fs session information 972bad8471SEric Van Hensbergen * @mode: mode to convert 982bad8471SEric Van Hensbergen * 992bad8471SEric Van Hensbergen */ 1002bad8471SEric Van Hensbergen 10173c592b9SEric Van Hensbergen static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) 1022bad8471SEric Van Hensbergen { 1032bad8471SEric Van Hensbergen int res; 1042bad8471SEric Van Hensbergen 1052bad8471SEric Van Hensbergen res = mode & 0777; 1062bad8471SEric Van Hensbergen 107bd238fb4SLatchesar Ionkov if ((mode & P9_DMDIR) == P9_DMDIR) 1082bad8471SEric Van Hensbergen res |= S_IFDIR; 109dd6102fbSSripathi Kodi else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) 1102bad8471SEric Van Hensbergen res |= S_IFLNK; 111dd6102fbSSripathi Kodi else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) 1122bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1132bad8471SEric Van Hensbergen res |= S_IFSOCK; 114dd6102fbSSripathi Kodi else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) 1152bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1162bad8471SEric Van Hensbergen res |= S_IFIFO; 117dd6102fbSSripathi Kodi else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) 1182bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1192bad8471SEric Van Hensbergen res |= S_IFBLK; 1202bad8471SEric Van Hensbergen else 1212bad8471SEric Van Hensbergen res |= S_IFREG; 1222bad8471SEric Van Hensbergen 123dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 124bd238fb4SLatchesar Ionkov if ((mode & P9_DMSETUID) == P9_DMSETUID) 1252bad8471SEric Van Hensbergen res |= S_ISUID; 1262bad8471SEric Van Hensbergen 127bd238fb4SLatchesar Ionkov if ((mode & P9_DMSETGID) == P9_DMSETGID) 1282bad8471SEric Van Hensbergen res |= S_ISGID; 129d199d652SAnthony Liguori 130d199d652SAnthony Liguori if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 131d199d652SAnthony Liguori res |= S_ISVTX; 1322bad8471SEric Van Hensbergen } 1332bad8471SEric Van Hensbergen 1342bad8471SEric Van Hensbergen return res; 1352bad8471SEric Van Hensbergen } 1362bad8471SEric Van Hensbergen 137ee443996SEric Van Hensbergen /** 138ee443996SEric Van Hensbergen * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 139ee443996SEric Van Hensbergen * @uflags: flags to convert 1402e4bef41SEric Van Hensbergen * @extended: if .u extensions are active 141ee443996SEric Van Hensbergen */ 142ee443996SEric Van Hensbergen 1432e4bef41SEric Van Hensbergen int v9fs_uflags2omode(int uflags, int extended) 1446a3124a3SLatchesar Ionkov { 1456a3124a3SLatchesar Ionkov int ret; 1466a3124a3SLatchesar Ionkov 1476a3124a3SLatchesar Ionkov ret = 0; 1486a3124a3SLatchesar Ionkov switch (uflags&3) { 1496a3124a3SLatchesar Ionkov default: 1506a3124a3SLatchesar Ionkov case O_RDONLY: 151bd238fb4SLatchesar Ionkov ret = P9_OREAD; 1526a3124a3SLatchesar Ionkov break; 1536a3124a3SLatchesar Ionkov 1546a3124a3SLatchesar Ionkov case O_WRONLY: 155bd238fb4SLatchesar Ionkov ret = P9_OWRITE; 1566a3124a3SLatchesar Ionkov break; 1576a3124a3SLatchesar Ionkov 1586a3124a3SLatchesar Ionkov case O_RDWR: 159bd238fb4SLatchesar Ionkov ret = P9_ORDWR; 1606a3124a3SLatchesar Ionkov break; 1616a3124a3SLatchesar Ionkov } 1626a3124a3SLatchesar Ionkov 1636a3124a3SLatchesar Ionkov if (uflags & O_TRUNC) 164bd238fb4SLatchesar Ionkov ret |= P9_OTRUNC; 1656a3124a3SLatchesar Ionkov 1662e4bef41SEric Van Hensbergen if (extended) { 1672e4bef41SEric Van Hensbergen if (uflags & O_EXCL) 1682e4bef41SEric Van Hensbergen ret |= P9_OEXCL; 1692e4bef41SEric Van Hensbergen 1706a3124a3SLatchesar Ionkov if (uflags & O_APPEND) 171bd238fb4SLatchesar Ionkov ret |= P9_OAPPEND; 1722e4bef41SEric Van Hensbergen } 1736a3124a3SLatchesar Ionkov 1746a3124a3SLatchesar Ionkov return ret; 1756a3124a3SLatchesar Ionkov } 1766a3124a3SLatchesar Ionkov 1772bad8471SEric Van Hensbergen /** 178531b1094SLatchesar Ionkov * v9fs_blank_wstat - helper function to setup a 9P stat structure 179531b1094SLatchesar Ionkov * @wstat: structure to initialize 1802bad8471SEric Van Hensbergen * 1812bad8471SEric Van Hensbergen */ 1822bad8471SEric Van Hensbergen 1837a4439c4SM. Mohan Kumar void 184bd238fb4SLatchesar Ionkov v9fs_blank_wstat(struct p9_wstat *wstat) 1852bad8471SEric Van Hensbergen { 186531b1094SLatchesar Ionkov wstat->type = ~0; 187531b1094SLatchesar Ionkov wstat->dev = ~0; 188531b1094SLatchesar Ionkov wstat->qid.type = ~0; 189531b1094SLatchesar Ionkov wstat->qid.version = ~0; 190531b1094SLatchesar Ionkov *((long long *)&wstat->qid.path) = ~0; 191531b1094SLatchesar Ionkov wstat->mode = ~0; 192531b1094SLatchesar Ionkov wstat->atime = ~0; 193531b1094SLatchesar Ionkov wstat->mtime = ~0; 194531b1094SLatchesar Ionkov wstat->length = ~0; 195531b1094SLatchesar Ionkov wstat->name = NULL; 196531b1094SLatchesar Ionkov wstat->uid = NULL; 197531b1094SLatchesar Ionkov wstat->gid = NULL; 198531b1094SLatchesar Ionkov wstat->muid = NULL; 199531b1094SLatchesar Ionkov wstat->n_uid = ~0; 200531b1094SLatchesar Ionkov wstat->n_gid = ~0; 201531b1094SLatchesar Ionkov wstat->n_muid = ~0; 202531b1094SLatchesar Ionkov wstat->extension = NULL; 2032bad8471SEric Van Hensbergen } 2042bad8471SEric Van Hensbergen 20560e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 20660e78d2cSAbhishek Kulkarni /** 20760e78d2cSAbhishek Kulkarni * v9fs_alloc_inode - helper function to allocate an inode 20860e78d2cSAbhishek Kulkarni * This callback is executed before setting up the inode so that we 20960e78d2cSAbhishek Kulkarni * can associate a vcookie with each inode. 21060e78d2cSAbhishek Kulkarni * 21160e78d2cSAbhishek Kulkarni */ 21260e78d2cSAbhishek Kulkarni 21360e78d2cSAbhishek Kulkarni struct inode *v9fs_alloc_inode(struct super_block *sb) 21460e78d2cSAbhishek Kulkarni { 21560e78d2cSAbhishek Kulkarni struct v9fs_cookie *vcookie; 21660e78d2cSAbhishek Kulkarni vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache, 21760e78d2cSAbhishek Kulkarni GFP_KERNEL); 21860e78d2cSAbhishek Kulkarni if (!vcookie) 21960e78d2cSAbhishek Kulkarni return NULL; 22060e78d2cSAbhishek Kulkarni 22160e78d2cSAbhishek Kulkarni vcookie->fscache = NULL; 22260e78d2cSAbhishek Kulkarni vcookie->qid = NULL; 22360e78d2cSAbhishek Kulkarni spin_lock_init(&vcookie->lock); 22460e78d2cSAbhishek Kulkarni return &vcookie->inode; 22560e78d2cSAbhishek Kulkarni } 22660e78d2cSAbhishek Kulkarni 22760e78d2cSAbhishek Kulkarni /** 22860e78d2cSAbhishek Kulkarni * v9fs_destroy_inode - destroy an inode 22960e78d2cSAbhishek Kulkarni * 23060e78d2cSAbhishek Kulkarni */ 23160e78d2cSAbhishek Kulkarni 23260e78d2cSAbhishek Kulkarni void v9fs_destroy_inode(struct inode *inode) 23360e78d2cSAbhishek Kulkarni { 23460e78d2cSAbhishek Kulkarni kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode)); 23560e78d2cSAbhishek Kulkarni } 23660e78d2cSAbhishek Kulkarni #endif 23760e78d2cSAbhishek Kulkarni 2382bad8471SEric Van Hensbergen /** 2392bad8471SEric Van Hensbergen * v9fs_get_inode - helper function to setup an inode 2402bad8471SEric Van Hensbergen * @sb: superblock 2412bad8471SEric Van Hensbergen * @mode: mode to setup inode with 2422bad8471SEric Van Hensbergen * 2432bad8471SEric Van Hensbergen */ 2442bad8471SEric Van Hensbergen 2452bad8471SEric Van Hensbergen struct inode *v9fs_get_inode(struct super_block *sb, int mode) 2462bad8471SEric Van Hensbergen { 2472bb54115SAbhishek Kulkarni int err; 2486a3124a3SLatchesar Ionkov struct inode *inode; 249b501611aSEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 2502bad8471SEric Van Hensbergen 251bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 2522bad8471SEric Van Hensbergen 2532bad8471SEric Van Hensbergen inode = new_inode(sb); 2542bb54115SAbhishek Kulkarni if (!inode) { 2552bb54115SAbhishek Kulkarni P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); 25648559b4cSAbhishek Kulkarni return ERR_PTR(-ENOMEM); 2572bb54115SAbhishek Kulkarni } 2582bb54115SAbhishek Kulkarni 2592bad8471SEric Van Hensbergen inode->i_mode = mode; 260f8b9d53aSDavid Howells inode->i_uid = current_fsuid(); 261f8b9d53aSDavid Howells inode->i_gid = current_fsgid(); 2622bad8471SEric Van Hensbergen inode->i_blocks = 0; 2632bad8471SEric Van Hensbergen inode->i_rdev = 0; 2642bad8471SEric Van Hensbergen inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 265147b31cfSEric Van Hensbergen inode->i_mapping->a_ops = &v9fs_addr_operations; 2662bad8471SEric Van Hensbergen 2672bad8471SEric Van Hensbergen switch (mode & S_IFMT) { 2682bad8471SEric Van Hensbergen case S_IFIFO: 2692bad8471SEric Van Hensbergen case S_IFBLK: 2702bad8471SEric Van Hensbergen case S_IFCHR: 2712bad8471SEric Van Hensbergen case S_IFSOCK: 272dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) { 273bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 274bd238fb4SLatchesar Ionkov "special files without extended mode\n"); 2752bb54115SAbhishek Kulkarni err = -EINVAL; 2762bb54115SAbhishek Kulkarni goto error; 277b501611aSEric Van Hensbergen } 2782bb54115SAbhishek Kulkarni init_special_inode(inode, inode->i_mode, inode->i_rdev); 2795d58bec5SEric Van Hensbergen break; 2802bad8471SEric Van Hensbergen case S_IFREG: 2819b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 2829b6533c9SSripathi Kodi inode->i_op = &v9fs_file_inode_operations_dotl; 2839b6533c9SSripathi Kodi inode->i_fop = &v9fs_file_operations_dotl; 2849b6533c9SSripathi Kodi } else { 2852bad8471SEric Van Hensbergen inode->i_op = &v9fs_file_inode_operations; 2862bad8471SEric Van Hensbergen inode->i_fop = &v9fs_file_operations; 2879b6533c9SSripathi Kodi } 2889b6533c9SSripathi Kodi 2892bad8471SEric Van Hensbergen break; 2909b6533c9SSripathi Kodi 291b501611aSEric Van Hensbergen case S_IFLNK: 2929b6533c9SSripathi Kodi if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 2939b6533c9SSripathi Kodi P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " 2949b6533c9SSripathi Kodi "legacy protocol.\n"); 2952bb54115SAbhishek Kulkarni err = -EINVAL; 2962bb54115SAbhishek Kulkarni goto error; 297b501611aSEric Van Hensbergen } 2989b6533c9SSripathi Kodi 2999b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3009b6533c9SSripathi Kodi inode->i_op = &v9fs_symlink_inode_operations_dotl; 3019b6533c9SSripathi Kodi else 302b501611aSEric Van Hensbergen inode->i_op = &v9fs_symlink_inode_operations; 3039b6533c9SSripathi Kodi 304b501611aSEric Van Hensbergen break; 3052bad8471SEric Van Hensbergen case S_IFDIR: 306d8c76e6fSDave Hansen inc_nlink(inode); 3079b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3089b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotl; 3099b6533c9SSripathi Kodi else if (v9fs_proto_dotu(v9ses)) 3109b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotu; 311b501611aSEric Van Hensbergen else 3122bad8471SEric Van Hensbergen inode->i_op = &v9fs_dir_inode_operations; 3139b6533c9SSripathi Kodi 3149b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3159b6533c9SSripathi Kodi inode->i_fop = &v9fs_dir_operations_dotl; 3169b6533c9SSripathi Kodi else 3172bad8471SEric Van Hensbergen inode->i_fop = &v9fs_dir_operations; 3189b6533c9SSripathi Kodi 3192bad8471SEric Van Hensbergen break; 3202bad8471SEric Van Hensbergen default: 3212bb54115SAbhishek Kulkarni P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 3222bad8471SEric Van Hensbergen mode, mode & S_IFMT); 3232bb54115SAbhishek Kulkarni err = -EINVAL; 3242bb54115SAbhishek Kulkarni goto error; 3252bad8471SEric Van Hensbergen } 3262bb54115SAbhishek Kulkarni 3272bad8471SEric Van Hensbergen return inode; 3282bb54115SAbhishek Kulkarni 3292bb54115SAbhishek Kulkarni error: 3302bb54115SAbhishek Kulkarni iput(inode); 3312bb54115SAbhishek Kulkarni return ERR_PTR(err); 3322bad8471SEric Van Hensbergen } 3332bad8471SEric Van Hensbergen 334bd238fb4SLatchesar Ionkov /* 3356a3124a3SLatchesar Ionkov static struct v9fs_fid* 3366a3124a3SLatchesar Ionkov v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 3376a3124a3SLatchesar Ionkov { 3386a3124a3SLatchesar Ionkov int err; 339736c4b85SMika Kukkonen int nfid; 3406a3124a3SLatchesar Ionkov struct v9fs_fid *ret; 3416a3124a3SLatchesar Ionkov struct v9fs_fcall *fcall; 3420b8dd177SLatchesar Ionkov 3436a3124a3SLatchesar Ionkov nfid = v9fs_get_idpool(&v9ses->fidpool); 3446a3124a3SLatchesar Ionkov if (nfid < 0) { 3450b8dd177SLatchesar Ionkov eprintk(KERN_WARNING, "no free fids available\n"); 346731805b4SLatchesar Ionkov return ERR_PTR(-ENOSPC); 3470b8dd177SLatchesar Ionkov } 3480b8dd177SLatchesar Ionkov 3496a3124a3SLatchesar Ionkov err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 3506a3124a3SLatchesar Ionkov &fcall); 3516a3124a3SLatchesar Ionkov 3526a3124a3SLatchesar Ionkov if (err < 0) { 35341e5a6acSLatchesar Ionkov if (fcall && fcall->id == RWALK) 35441e5a6acSLatchesar Ionkov goto clunk_fid; 35541e5a6acSLatchesar Ionkov 3566a3124a3SLatchesar Ionkov PRINT_FCALL_ERROR("walk error", fcall); 3576a3124a3SLatchesar Ionkov v9fs_put_idpool(nfid, &v9ses->fidpool); 3586a3124a3SLatchesar Ionkov goto error; 3590b8dd177SLatchesar Ionkov } 3606a3124a3SLatchesar Ionkov 3613cf6429aSLatchesar Ionkov kfree(fcall); 3623cf6429aSLatchesar Ionkov fcall = NULL; 3636a3124a3SLatchesar Ionkov ret = v9fs_fid_create(v9ses, nfid); 3646a3124a3SLatchesar Ionkov if (!ret) { 3656a3124a3SLatchesar Ionkov err = -ENOMEM; 3666a3124a3SLatchesar Ionkov goto clunk_fid; 3670b8dd177SLatchesar Ionkov } 3682bad8471SEric Van Hensbergen 3696a3124a3SLatchesar Ionkov err = v9fs_fid_insert(ret, dentry); 3706a3124a3SLatchesar Ionkov if (err < 0) { 3716a3124a3SLatchesar Ionkov v9fs_fid_destroy(ret); 3726a3124a3SLatchesar Ionkov goto clunk_fid; 3736a3124a3SLatchesar Ionkov } 3742bad8471SEric Van Hensbergen 3756a3124a3SLatchesar Ionkov return ret; 3766a3124a3SLatchesar Ionkov 3776a3124a3SLatchesar Ionkov clunk_fid: 3786a3124a3SLatchesar Ionkov v9fs_t_clunk(v9ses, nfid); 3796a3124a3SLatchesar Ionkov 3806a3124a3SLatchesar Ionkov error: 3816a3124a3SLatchesar Ionkov kfree(fcall); 3826a3124a3SLatchesar Ionkov return ERR_PTR(err); 3836a3124a3SLatchesar Ionkov } 384bd238fb4SLatchesar Ionkov */ 3856a3124a3SLatchesar Ionkov 38660e78d2cSAbhishek Kulkarni 38760e78d2cSAbhishek Kulkarni /** 38860e78d2cSAbhishek Kulkarni * v9fs_clear_inode - release an inode 38960e78d2cSAbhishek Kulkarni * @inode: inode to release 39060e78d2cSAbhishek Kulkarni * 39160e78d2cSAbhishek Kulkarni */ 39260e78d2cSAbhishek Kulkarni void v9fs_clear_inode(struct inode *inode) 39360e78d2cSAbhishek Kulkarni { 39460e78d2cSAbhishek Kulkarni filemap_fdatawrite(inode->i_mapping); 39560e78d2cSAbhishek Kulkarni 39660e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 39760e78d2cSAbhishek Kulkarni v9fs_cache_inode_put_cookie(inode); 39860e78d2cSAbhishek Kulkarni #endif 39960e78d2cSAbhishek Kulkarni } 40060e78d2cSAbhishek Kulkarni 401ee443996SEric Van Hensbergen /** 402ee443996SEric Van Hensbergen * v9fs_inode_from_fid - populate an inode by issuing a attribute request 403ee443996SEric Van Hensbergen * @v9ses: session information 404ee443996SEric Van Hensbergen * @fid: fid to issue attribute request for 405ee443996SEric Van Hensbergen * @sb: superblock on which to create inode 406ee443996SEric Van Hensbergen * 407ee443996SEric Van Hensbergen */ 408ee443996SEric Van Hensbergen 4095174fdabSLatchesar Ionkov static struct inode * 410bd238fb4SLatchesar Ionkov v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 4116a3124a3SLatchesar Ionkov struct super_block *sb) 4126a3124a3SLatchesar Ionkov { 4136a3124a3SLatchesar Ionkov int err, umode; 4146a3124a3SLatchesar Ionkov struct inode *ret; 41551a87c55SEric Van Hensbergen struct p9_wstat *st; 4166a3124a3SLatchesar Ionkov 4176a3124a3SLatchesar Ionkov ret = NULL; 418bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 41902bc3567SAbhishek Kulkarni if (IS_ERR(st)) 42002bc3567SAbhishek Kulkarni return ERR_CAST(st); 4212bad8471SEric Van Hensbergen 422bd238fb4SLatchesar Ionkov umode = p9mode2unixmode(v9ses, st->mode); 4236a3124a3SLatchesar Ionkov ret = v9fs_get_inode(sb, umode); 4246a3124a3SLatchesar Ionkov if (IS_ERR(ret)) { 4256a3124a3SLatchesar Ionkov err = PTR_ERR(ret); 4266a3124a3SLatchesar Ionkov goto error; 4272bad8471SEric Van Hensbergen } 4282bad8471SEric Van Hensbergen 429bd238fb4SLatchesar Ionkov v9fs_stat2inode(st, ret, sb); 430bd238fb4SLatchesar Ionkov ret->i_ino = v9fs_qid2ino(&st->qid); 43160e78d2cSAbhishek Kulkarni 43260e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 43360e78d2cSAbhishek Kulkarni v9fs_vcookie_set_qid(ret, &st->qid); 43460e78d2cSAbhishek Kulkarni v9fs_cache_inode_get_cookie(ret); 43560e78d2cSAbhishek Kulkarni #endif 43602bc3567SAbhishek Kulkarni p9stat_free(st); 437bd238fb4SLatchesar Ionkov kfree(st); 43860e78d2cSAbhishek Kulkarni 4396a3124a3SLatchesar Ionkov return ret; 4402bad8471SEric Van Hensbergen 4416a3124a3SLatchesar Ionkov error: 44202bc3567SAbhishek Kulkarni p9stat_free(st); 443bd238fb4SLatchesar Ionkov kfree(st); 4446a3124a3SLatchesar Ionkov return ERR_PTR(err); 4452bad8471SEric Van Hensbergen } 4462bad8471SEric Van Hensbergen 4472bad8471SEric Van Hensbergen /** 4482bad8471SEric Van Hensbergen * v9fs_remove - helper function to remove files and directories 44973c592b9SEric Van Hensbergen * @dir: directory inode that is being deleted 45073c592b9SEric Van Hensbergen * @file: dentry that is being deleted 45173c592b9SEric Van Hensbergen * @rmdir: removing a directory 4522bad8471SEric Van Hensbergen * 4532bad8471SEric Van Hensbergen */ 4542bad8471SEric Van Hensbergen 4552bad8471SEric Van Hensbergen static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) 4562bad8471SEric Van Hensbergen { 457d994f405SAneesh Kumar K.V int retval; 458bd238fb4SLatchesar Ionkov struct inode *file_inode; 459bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 460bd238fb4SLatchesar Ionkov struct p9_fid *v9fid; 4612bad8471SEric Van Hensbergen 462bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, 4632bad8471SEric Van Hensbergen rmdir); 4642bad8471SEric Van Hensbergen 4652bad8471SEric Van Hensbergen file_inode = file->d_inode; 4662bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(file_inode); 467c959df9fSLatchesar Ionkov v9fid = v9fs_fid_clone(file); 468da977b2cSEric Van Hensbergen if (IS_ERR(v9fid)) 469da977b2cSEric Van Hensbergen return PTR_ERR(v9fid); 4702bad8471SEric Van Hensbergen 471d994f405SAneesh Kumar K.V retval = p9_client_remove(v9fid); 472d994f405SAneesh Kumar K.V if (!retval) 473d994f405SAneesh Kumar K.V drop_nlink(file_inode); 474d994f405SAneesh Kumar K.V return retval; 4752bad8471SEric Van Hensbergen } 4762bad8471SEric Van Hensbergen 4776a3124a3SLatchesar Ionkov static int 4786a3124a3SLatchesar Ionkov v9fs_open_created(struct inode *inode, struct file *file) 4796a3124a3SLatchesar Ionkov { 4806a3124a3SLatchesar Ionkov return 0; 4816a3124a3SLatchesar Ionkov } 4826a3124a3SLatchesar Ionkov 483bd238fb4SLatchesar Ionkov 484bd238fb4SLatchesar Ionkov /** 485bd238fb4SLatchesar Ionkov * v9fs_create - Create a file 486ee443996SEric Van Hensbergen * @v9ses: session information 487ee443996SEric Van Hensbergen * @dir: directory that dentry is being created in 488bd238fb4SLatchesar Ionkov * @dentry: dentry that is being created 4890e15597eSAbhishek Kulkarni * @extension: 9p2000.u extension string to support devices, etc. 490bd238fb4SLatchesar Ionkov * @perm: create permissions 491bd238fb4SLatchesar Ionkov * @mode: open mode 492bd238fb4SLatchesar Ionkov * 493bd238fb4SLatchesar Ionkov */ 494bd238fb4SLatchesar Ionkov static struct p9_fid * 495bd238fb4SLatchesar Ionkov v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 496bd238fb4SLatchesar Ionkov struct dentry *dentry, char *extension, u32 perm, u8 mode) 497bd238fb4SLatchesar Ionkov { 498bd238fb4SLatchesar Ionkov int err; 499bd238fb4SLatchesar Ionkov char *name; 500bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *ofid, *fid; 501bd238fb4SLatchesar Ionkov struct inode *inode; 502bd238fb4SLatchesar Ionkov 50351a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 50451a87c55SEric Van Hensbergen 505bd238fb4SLatchesar Ionkov err = 0; 506bd238fb4SLatchesar Ionkov ofid = NULL; 507bd238fb4SLatchesar Ionkov fid = NULL; 508bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 509bd238fb4SLatchesar Ionkov dfid = v9fs_fid_clone(dentry->d_parent); 510bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) { 511bd238fb4SLatchesar Ionkov err = PTR_ERR(dfid); 51251a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "fid clone failed %d\n", err); 513bd238fb4SLatchesar Ionkov dfid = NULL; 514bd238fb4SLatchesar Ionkov goto error; 515bd238fb4SLatchesar Ionkov } 516bd238fb4SLatchesar Ionkov 517bd238fb4SLatchesar Ionkov /* clone a fid to use for creation */ 518bd238fb4SLatchesar Ionkov ofid = p9_client_walk(dfid, 0, NULL, 1); 519bd238fb4SLatchesar Ionkov if (IS_ERR(ofid)) { 520bd238fb4SLatchesar Ionkov err = PTR_ERR(ofid); 52151a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 522bd238fb4SLatchesar Ionkov ofid = NULL; 523bd238fb4SLatchesar Ionkov goto error; 524bd238fb4SLatchesar Ionkov } 525bd238fb4SLatchesar Ionkov 526bd238fb4SLatchesar Ionkov err = p9_client_fcreate(ofid, name, perm, mode, extension); 52751a87c55SEric Van Hensbergen if (err < 0) { 52851a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 529bd238fb4SLatchesar Ionkov goto error; 53051a87c55SEric Van Hensbergen } 531bd238fb4SLatchesar Ionkov 532bd238fb4SLatchesar Ionkov /* now walk from the parent so we can get unopened fid */ 533bd238fb4SLatchesar Ionkov fid = p9_client_walk(dfid, 1, &name, 0); 534bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 535bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 53651a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 537bd238fb4SLatchesar Ionkov fid = NULL; 538bd238fb4SLatchesar Ionkov goto error; 539bd238fb4SLatchesar Ionkov } else 540bd238fb4SLatchesar Ionkov dfid = NULL; 541bd238fb4SLatchesar Ionkov 542bd238fb4SLatchesar Ionkov /* instantiate inode and assign the unopened fid to the dentry */ 543bd238fb4SLatchesar Ionkov inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 544bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 545bd238fb4SLatchesar Ionkov err = PTR_ERR(inode); 54651a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); 547bd238fb4SLatchesar Ionkov goto error; 548bd238fb4SLatchesar Ionkov } 549bd238fb4SLatchesar Ionkov 550bd238fb4SLatchesar Ionkov if (v9ses->cache) 551bd238fb4SLatchesar Ionkov dentry->d_op = &v9fs_cached_dentry_operations; 552bd238fb4SLatchesar Ionkov else 553bd238fb4SLatchesar Ionkov dentry->d_op = &v9fs_dentry_operations; 554bd238fb4SLatchesar Ionkov 555bd238fb4SLatchesar Ionkov d_instantiate(dentry, inode); 55650fb6d2bSAbhishek Kulkarni err = v9fs_fid_add(dentry, fid); 55750fb6d2bSAbhishek Kulkarni if (err < 0) 55850fb6d2bSAbhishek Kulkarni goto error; 55950fb6d2bSAbhishek Kulkarni 560bd238fb4SLatchesar Ionkov return ofid; 561bd238fb4SLatchesar Ionkov 562bd238fb4SLatchesar Ionkov error: 563bd238fb4SLatchesar Ionkov if (dfid) 564bd238fb4SLatchesar Ionkov p9_client_clunk(dfid); 565bd238fb4SLatchesar Ionkov 566bd238fb4SLatchesar Ionkov if (ofid) 567bd238fb4SLatchesar Ionkov p9_client_clunk(ofid); 568bd238fb4SLatchesar Ionkov 569bd238fb4SLatchesar Ionkov if (fid) 570bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 571bd238fb4SLatchesar Ionkov 572bd238fb4SLatchesar Ionkov return ERR_PTR(err); 573bd238fb4SLatchesar Ionkov } 574bd238fb4SLatchesar Ionkov 5752bad8471SEric Van Hensbergen /** 5762bad8471SEric Van Hensbergen * v9fs_vfs_create - VFS hook to create files 577ee443996SEric Van Hensbergen * @dir: directory inode that is being created 5782bad8471SEric Van Hensbergen * @dentry: dentry that is being deleted 5796a3124a3SLatchesar Ionkov * @mode: create permissions 5802bad8471SEric Van Hensbergen * @nd: path information 5812bad8471SEric Van Hensbergen * 5822bad8471SEric Van Hensbergen */ 5832bad8471SEric Van Hensbergen 5842bad8471SEric Van Hensbergen static int 5856a3124a3SLatchesar Ionkov v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 5862bad8471SEric Van Hensbergen struct nameidata *nd) 5872bad8471SEric Van Hensbergen { 5886a3124a3SLatchesar Ionkov int err; 589bd238fb4SLatchesar Ionkov u32 perm; 5906a3124a3SLatchesar Ionkov int flags; 5916a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 592bd238fb4SLatchesar Ionkov struct p9_fid *fid; 5936a3124a3SLatchesar Ionkov struct file *filp; 5946a3124a3SLatchesar Ionkov 595bd238fb4SLatchesar Ionkov err = 0; 596bd238fb4SLatchesar Ionkov fid = NULL; 5976a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 598da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 5996a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) 6006a3124a3SLatchesar Ionkov flags = nd->intent.open.flags - 1; 6016a3124a3SLatchesar Ionkov else 6026a3124a3SLatchesar Ionkov flags = O_RDWR; 6036a3124a3SLatchesar Ionkov 604bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 605dd6102fbSSripathi Kodi v9fs_uflags2omode(flags, 606dd6102fbSSripathi Kodi v9fs_proto_dotu(v9ses))); 607bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 608bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 609bd238fb4SLatchesar Ionkov fid = NULL; 6106a3124a3SLatchesar Ionkov goto error; 6116a3124a3SLatchesar Ionkov } 6126a3124a3SLatchesar Ionkov 613bd238fb4SLatchesar Ionkov /* if we are opening a file, assign the open fid to the file */ 6146a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) { 6156a3124a3SLatchesar Ionkov filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); 6166a3124a3SLatchesar Ionkov if (IS_ERR(filp)) { 617bd238fb4SLatchesar Ionkov err = PTR_ERR(filp); 618bd238fb4SLatchesar Ionkov goto error; 6196a3124a3SLatchesar Ionkov } 6206a3124a3SLatchesar Ionkov 621bd238fb4SLatchesar Ionkov filp->private_data = fid; 622bd238fb4SLatchesar Ionkov } else 623bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6246a3124a3SLatchesar Ionkov 6256a3124a3SLatchesar Ionkov return 0; 6266a3124a3SLatchesar Ionkov 6276a3124a3SLatchesar Ionkov error: 628bd238fb4SLatchesar Ionkov if (fid) 629bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6306a3124a3SLatchesar Ionkov 6316a3124a3SLatchesar Ionkov return err; 6322bad8471SEric Van Hensbergen } 6332bad8471SEric Van Hensbergen 6342bad8471SEric Van Hensbergen /** 6352bad8471SEric Van Hensbergen * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 636ee443996SEric Van Hensbergen * @dir: inode that is being unlinked 6372bad8471SEric Van Hensbergen * @dentry: dentry that is being unlinked 6382bad8471SEric Van Hensbergen * @mode: mode for new directory 6392bad8471SEric Van Hensbergen * 6402bad8471SEric Van Hensbergen */ 6412bad8471SEric Van Hensbergen 6426a3124a3SLatchesar Ionkov static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 6432bad8471SEric Van Hensbergen { 6446a3124a3SLatchesar Ionkov int err; 645bd238fb4SLatchesar Ionkov u32 perm; 6466a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 647bd238fb4SLatchesar Ionkov struct p9_fid *fid; 6486a3124a3SLatchesar Ionkov 649bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 650bd238fb4SLatchesar Ionkov err = 0; 6516a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 6526a3124a3SLatchesar Ionkov perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 653bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 654bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 655bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 656bd238fb4SLatchesar Ionkov fid = NULL; 6576a3124a3SLatchesar Ionkov } 6586a3124a3SLatchesar Ionkov 659bd238fb4SLatchesar Ionkov if (fid) 660bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6616a3124a3SLatchesar Ionkov 6626a3124a3SLatchesar Ionkov return err; 6632bad8471SEric Van Hensbergen } 6642bad8471SEric Van Hensbergen 6652bad8471SEric Van Hensbergen /** 6662bad8471SEric Van Hensbergen * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 6672bad8471SEric Van Hensbergen * @dir: inode that is being walked from 6682bad8471SEric Van Hensbergen * @dentry: dentry that is being walked to? 6692bad8471SEric Van Hensbergen * @nameidata: path data 6702bad8471SEric Van Hensbergen * 6712bad8471SEric Van Hensbergen */ 6722bad8471SEric Van Hensbergen 6732bad8471SEric Van Hensbergen static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 6742bad8471SEric Van Hensbergen struct nameidata *nameidata) 6752bad8471SEric Van Hensbergen { 6762bad8471SEric Van Hensbergen struct super_block *sb; 6772bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses; 678bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *fid; 6792bad8471SEric Van Hensbergen struct inode *inode; 680bd238fb4SLatchesar Ionkov char *name; 6812bad8471SEric Van Hensbergen int result = 0; 6822bad8471SEric Van Hensbergen 683bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 684731805b4SLatchesar Ionkov dir, dentry->d_name.name, dentry, nameidata); 6852bad8471SEric Van Hensbergen 68611e9b49bSSripathi Kodi if (dentry->d_name.len > NAME_MAX) 68711e9b49bSSripathi Kodi return ERR_PTR(-ENAMETOOLONG); 68811e9b49bSSripathi Kodi 6892bad8471SEric Van Hensbergen sb = dir->i_sb; 6902bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(dir); 691bd238fb4SLatchesar Ionkov dfid = v9fs_fid_lookup(dentry->d_parent); 692bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) 693e231c2eeSDavid Howells return ERR_CAST(dfid); 6942bad8471SEric Van Hensbergen 695bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 696bd238fb4SLatchesar Ionkov fid = p9_client_walk(dfid, 1, &name, 1); 697bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 698bd238fb4SLatchesar Ionkov result = PTR_ERR(fid); 6992bad8471SEric Van Hensbergen if (result == -ENOENT) { 7002bad8471SEric Van Hensbergen d_add(dentry, NULL); 7012bad8471SEric Van Hensbergen return NULL; 7022bad8471SEric Van Hensbergen } 7032bad8471SEric Van Hensbergen 704bd238fb4SLatchesar Ionkov return ERR_PTR(result); 7052bad8471SEric Van Hensbergen } 7062bad8471SEric Van Hensbergen 707bd238fb4SLatchesar Ionkov inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 708bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 709bd238fb4SLatchesar Ionkov result = PTR_ERR(inode); 710bd238fb4SLatchesar Ionkov inode = NULL; 711bd238fb4SLatchesar Ionkov goto error; 7122bad8471SEric Van Hensbergen } 7132bad8471SEric Van Hensbergen 714bd238fb4SLatchesar Ionkov result = v9fs_fid_add(dentry, fid); 7156a3124a3SLatchesar Ionkov if (result < 0) 716bd238fb4SLatchesar Ionkov goto error; 7176a3124a3SLatchesar Ionkov 718e03abc0cSEric Van Hensbergen if ((fid->qid.version) && (v9ses->cache)) 719e03abc0cSEric Van Hensbergen dentry->d_op = &v9fs_cached_dentry_operations; 720e03abc0cSEric Van Hensbergen else 721e03abc0cSEric Van Hensbergen dentry->d_op = &v9fs_dentry_operations; 7222bad8471SEric Van Hensbergen 7232bad8471SEric Van Hensbergen d_add(dentry, inode); 7242bad8471SEric Van Hensbergen return NULL; 7252bad8471SEric Van Hensbergen 726bd238fb4SLatchesar Ionkov error: 727bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 728da977b2cSEric Van Hensbergen 7292bad8471SEric Van Hensbergen return ERR_PTR(result); 7302bad8471SEric Van Hensbergen } 7312bad8471SEric Van Hensbergen 7322bad8471SEric Van Hensbergen /** 7332bad8471SEric Van Hensbergen * v9fs_vfs_unlink - VFS unlink hook to delete an inode 7342bad8471SEric Van Hensbergen * @i: inode that is being unlinked 73573c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7362bad8471SEric Van Hensbergen * 7372bad8471SEric Van Hensbergen */ 7382bad8471SEric Van Hensbergen 7392bad8471SEric Van Hensbergen static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 7402bad8471SEric Van Hensbergen { 7412bad8471SEric Van Hensbergen return v9fs_remove(i, d, 0); 7422bad8471SEric Van Hensbergen } 7432bad8471SEric Van Hensbergen 7442bad8471SEric Van Hensbergen /** 7452bad8471SEric Van Hensbergen * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 7462bad8471SEric Van Hensbergen * @i: inode that is being unlinked 74773c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7482bad8471SEric Van Hensbergen * 7492bad8471SEric Van Hensbergen */ 7502bad8471SEric Van Hensbergen 7512bad8471SEric Van Hensbergen static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 7522bad8471SEric Van Hensbergen { 7532bad8471SEric Van Hensbergen return v9fs_remove(i, d, 1); 7542bad8471SEric Van Hensbergen } 7552bad8471SEric Van Hensbergen 7562bad8471SEric Van Hensbergen /** 7572bad8471SEric Van Hensbergen * v9fs_vfs_rename - VFS hook to rename an inode 7582bad8471SEric Van Hensbergen * @old_dir: old dir inode 7592bad8471SEric Van Hensbergen * @old_dentry: old dentry 7602bad8471SEric Van Hensbergen * @new_dir: new dir inode 7612bad8471SEric Van Hensbergen * @new_dentry: new dentry 7622bad8471SEric Van Hensbergen * 7632bad8471SEric Van Hensbergen */ 7642bad8471SEric Van Hensbergen 7652bad8471SEric Van Hensbergen static int 7662bad8471SEric Van Hensbergen v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 7672bad8471SEric Van Hensbergen struct inode *new_dir, struct dentry *new_dentry) 7682bad8471SEric Van Hensbergen { 769bd238fb4SLatchesar Ionkov struct inode *old_inode; 770bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 771bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 772bd238fb4SLatchesar Ionkov struct p9_fid *olddirfid; 773bd238fb4SLatchesar Ionkov struct p9_fid *newdirfid; 774bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 775bd238fb4SLatchesar Ionkov int retval; 7762bad8471SEric Van Hensbergen 777bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 778bd238fb4SLatchesar Ionkov retval = 0; 779bd238fb4SLatchesar Ionkov old_inode = old_dentry->d_inode; 780bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(old_inode); 781bd238fb4SLatchesar Ionkov oldfid = v9fs_fid_lookup(old_dentry); 782da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 783da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 784da977b2cSEric Van Hensbergen 785da977b2cSEric Van Hensbergen olddirfid = v9fs_fid_clone(old_dentry->d_parent); 786da977b2cSEric Van Hensbergen if (IS_ERR(olddirfid)) { 787da977b2cSEric Van Hensbergen retval = PTR_ERR(olddirfid); 788bd238fb4SLatchesar Ionkov goto done; 789da977b2cSEric Van Hensbergen } 790da977b2cSEric Van Hensbergen 791da977b2cSEric Van Hensbergen newdirfid = v9fs_fid_clone(new_dentry->d_parent); 792da977b2cSEric Van Hensbergen if (IS_ERR(newdirfid)) { 793da977b2cSEric Van Hensbergen retval = PTR_ERR(newdirfid); 794bd238fb4SLatchesar Ionkov goto clunk_olddir; 7952bad8471SEric Van Hensbergen } 7962bad8471SEric Van Hensbergen 7972bad8471SEric Van Hensbergen /* 9P can only handle file rename in the same directory */ 7982bad8471SEric Van Hensbergen if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { 799bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 800bd238fb4SLatchesar Ionkov "old dir and new dir are different\n"); 801621997cdSEric Van Hensbergen retval = -EXDEV; 802bd238fb4SLatchesar Ionkov goto clunk_newdir; 8032bad8471SEric Van Hensbergen } 8042bad8471SEric Van Hensbergen 805531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 806ba17674fSLatchesar Ionkov wstat.muid = v9ses->uname; 807531b1094SLatchesar Ionkov wstat.name = (char *) new_dentry->d_name.name; 808bd238fb4SLatchesar Ionkov retval = p9_client_wstat(oldfid, &wstat); 8092bad8471SEric Van Hensbergen 810bd238fb4SLatchesar Ionkov clunk_newdir: 81122150c4fSLatchesar Ionkov p9_client_clunk(newdirfid); 8122bad8471SEric Van Hensbergen 813bd238fb4SLatchesar Ionkov clunk_olddir: 81422150c4fSLatchesar Ionkov p9_client_clunk(olddirfid); 8152bad8471SEric Van Hensbergen 816bd238fb4SLatchesar Ionkov done: 8172bad8471SEric Van Hensbergen return retval; 8182bad8471SEric Van Hensbergen } 8192bad8471SEric Van Hensbergen 8202bad8471SEric Van Hensbergen /** 821943ffb58SAdrian Bunk * v9fs_vfs_getattr - retrieve file metadata 822ee443996SEric Van Hensbergen * @mnt: mount information 823ee443996SEric Van Hensbergen * @dentry: file to get attributes on 824ee443996SEric Van Hensbergen * @stat: metadata structure to populate 8252bad8471SEric Van Hensbergen * 8262bad8471SEric Van Hensbergen */ 8272bad8471SEric Van Hensbergen 8282bad8471SEric Van Hensbergen static int 8292bad8471SEric Van Hensbergen v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 8302bad8471SEric Van Hensbergen struct kstat *stat) 8312bad8471SEric Van Hensbergen { 832bd238fb4SLatchesar Ionkov int err; 833bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 834bd238fb4SLatchesar Ionkov struct p9_fid *fid; 83551a87c55SEric Van Hensbergen struct p9_wstat *st; 8362bad8471SEric Van Hensbergen 837bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); 838bd238fb4SLatchesar Ionkov err = -EPERM; 839bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 84060e78d2cSAbhishek Kulkarni if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 8419523a841SEric Van Hensbergen return simple_getattr(mnt, dentry, stat); 8429523a841SEric Van Hensbergen 843bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 844da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 845da977b2cSEric Van Hensbergen return PTR_ERR(fid); 8462bad8471SEric Van Hensbergen 847bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 848bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 849bd238fb4SLatchesar Ionkov return PTR_ERR(st); 8502bad8471SEric Van Hensbergen 851bd238fb4SLatchesar Ionkov v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 8522bad8471SEric Van Hensbergen generic_fillattr(dentry->d_inode, stat); 8532bad8471SEric Van Hensbergen 854bd238fb4SLatchesar Ionkov kfree(st); 855bd238fb4SLatchesar Ionkov return 0; 8562bad8471SEric Van Hensbergen } 8572bad8471SEric Van Hensbergen 8582bad8471SEric Van Hensbergen /** 8592bad8471SEric Van Hensbergen * v9fs_vfs_setattr - set file metadata 8602bad8471SEric Van Hensbergen * @dentry: file whose metadata to set 8612bad8471SEric Van Hensbergen * @iattr: metadata assignment structure 8622bad8471SEric Van Hensbergen * 8632bad8471SEric Van Hensbergen */ 8642bad8471SEric Van Hensbergen 8652bad8471SEric Van Hensbergen static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 8662bad8471SEric Van Hensbergen { 867bd238fb4SLatchesar Ionkov int retval; 868bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 869bd238fb4SLatchesar Ionkov struct p9_fid *fid; 870bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 8712bad8471SEric Van Hensbergen 872bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 873bd238fb4SLatchesar Ionkov retval = -EPERM; 874bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 875bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 876da977b2cSEric Van Hensbergen if(IS_ERR(fid)) 877da977b2cSEric Van Hensbergen return PTR_ERR(fid); 8782bad8471SEric Van Hensbergen 879531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 8802bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MODE) 881531b1094SLatchesar Ionkov wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 8822bad8471SEric Van Hensbergen 8832bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MTIME) 884531b1094SLatchesar Ionkov wstat.mtime = iattr->ia_mtime.tv_sec; 8852bad8471SEric Van Hensbergen 8862bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_ATIME) 887531b1094SLatchesar Ionkov wstat.atime = iattr->ia_atime.tv_sec; 8882bad8471SEric Van Hensbergen 8892bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_SIZE) 890531b1094SLatchesar Ionkov wstat.length = iattr->ia_size; 8912bad8471SEric Van Hensbergen 892dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 893531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_UID) 894531b1094SLatchesar Ionkov wstat.n_uid = iattr->ia_uid; 8952bad8471SEric Van Hensbergen 896531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_GID) 897531b1094SLatchesar Ionkov wstat.n_gid = iattr->ia_gid; 8982bad8471SEric Van Hensbergen } 8992bad8471SEric Van Hensbergen 900bd238fb4SLatchesar Ionkov retval = p9_client_wstat(fid, &wstat); 901bd238fb4SLatchesar Ionkov if (retval >= 0) 902bd238fb4SLatchesar Ionkov retval = inode_setattr(dentry->d_inode, iattr); 9032bad8471SEric Van Hensbergen 904bd238fb4SLatchesar Ionkov return retval; 9052bad8471SEric Van Hensbergen } 9062bad8471SEric Van Hensbergen 9072bad8471SEric Van Hensbergen /** 908531b1094SLatchesar Ionkov * v9fs_stat2inode - populate an inode structure with mistat info 909531b1094SLatchesar Ionkov * @stat: Plan 9 metadata (mistat) structure 9102bad8471SEric Van Hensbergen * @inode: inode to populate 9112bad8471SEric Van Hensbergen * @sb: superblock of filesystem 9122bad8471SEric Van Hensbergen * 9132bad8471SEric Van Hensbergen */ 9142bad8471SEric Van Hensbergen 9152bad8471SEric Van Hensbergen void 91651a87c55SEric Van Hensbergen v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 9172bad8471SEric Van Hensbergen struct super_block *sb) 9182bad8471SEric Van Hensbergen { 919531b1094SLatchesar Ionkov char ext[32]; 9205717144aSAneesh Kumar K.V char tag_name[14]; 9215717144aSAneesh Kumar K.V unsigned int i_nlink; 9222bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 9232bad8471SEric Van Hensbergen 9242bad8471SEric Van Hensbergen inode->i_nlink = 1; 9252bad8471SEric Van Hensbergen 926531b1094SLatchesar Ionkov inode->i_atime.tv_sec = stat->atime; 927531b1094SLatchesar Ionkov inode->i_mtime.tv_sec = stat->mtime; 928531b1094SLatchesar Ionkov inode->i_ctime.tv_sec = stat->mtime; 9292bad8471SEric Van Hensbergen 930bd32b82dSLatchesar Ionkov inode->i_uid = v9ses->dfltuid; 931bd32b82dSLatchesar Ionkov inode->i_gid = v9ses->dfltgid; 9322bad8471SEric Van Hensbergen 933dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 934531b1094SLatchesar Ionkov inode->i_uid = stat->n_uid; 935531b1094SLatchesar Ionkov inode->i_gid = stat->n_gid; 936531b1094SLatchesar Ionkov } 9375717144aSAneesh Kumar K.V if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 9385717144aSAneesh Kumar K.V if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 9395717144aSAneesh Kumar K.V /* 9405717144aSAneesh Kumar K.V * Hadlink support got added later to 9415717144aSAneesh Kumar K.V * to the .u extension. So there can be 9425717144aSAneesh Kumar K.V * server out there that doesn't support 9435717144aSAneesh Kumar K.V * this even with .u extension. So check 9445717144aSAneesh Kumar K.V * for non NULL stat->extension 9455717144aSAneesh Kumar K.V */ 9465717144aSAneesh Kumar K.V strncpy(ext, stat->extension, sizeof(ext)); 9475717144aSAneesh Kumar K.V /* HARDLINKCOUNT %u */ 9485717144aSAneesh Kumar K.V sscanf(ext, "%13s %u", tag_name, &i_nlink); 9495717144aSAneesh Kumar K.V if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 9505717144aSAneesh Kumar K.V inode->i_nlink = i_nlink; 9515717144aSAneesh Kumar K.V } 9525717144aSAneesh Kumar K.V } 953531b1094SLatchesar Ionkov inode->i_mode = p9mode2unixmode(v9ses, stat->mode); 9542bad8471SEric Van Hensbergen if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 9552bad8471SEric Van Hensbergen char type = 0; 9562bad8471SEric Van Hensbergen int major = -1; 9572bad8471SEric Van Hensbergen int minor = -1; 958531b1094SLatchesar Ionkov 95951a87c55SEric Van Hensbergen strncpy(ext, stat->extension, sizeof(ext)); 960531b1094SLatchesar Ionkov sscanf(ext, "%c %u %u", &type, &major, &minor); 9612bad8471SEric Van Hensbergen switch (type) { 9622bad8471SEric Van Hensbergen case 'c': 9632bad8471SEric Van Hensbergen inode->i_mode &= ~S_IFBLK; 9642bad8471SEric Van Hensbergen inode->i_mode |= S_IFCHR; 9652bad8471SEric Van Hensbergen break; 9662bad8471SEric Van Hensbergen case 'b': 9672bad8471SEric Van Hensbergen break; 9682bad8471SEric Van Hensbergen default: 969bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 97051a87c55SEric Van Hensbergen "Unknown special type %c %s\n", type, 97151a87c55SEric Van Hensbergen stat->extension); 9722bad8471SEric Van Hensbergen }; 9732bad8471SEric Van Hensbergen inode->i_rdev = MKDEV(major, minor); 97457c7b4e6SMagnus Deininger init_special_inode(inode, inode->i_mode, inode->i_rdev); 9752bad8471SEric Van Hensbergen } else 9762bad8471SEric Van Hensbergen inode->i_rdev = 0; 9772bad8471SEric Van Hensbergen 9787549ae3eSAbhishek Kulkarni i_size_write(inode, stat->length); 9792bad8471SEric Van Hensbergen 980bd238fb4SLatchesar Ionkov /* not real number of blocks, but 512 byte ones ... */ 9817549ae3eSAbhishek Kulkarni inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 9822bad8471SEric Van Hensbergen } 9832bad8471SEric Van Hensbergen 9842bad8471SEric Van Hensbergen /** 9852bad8471SEric Van Hensbergen * v9fs_qid2ino - convert qid into inode number 9862bad8471SEric Van Hensbergen * @qid: qid to hash 9872bad8471SEric Van Hensbergen * 9882bad8471SEric Van Hensbergen * BUG: potential for inode number collisions? 9892bad8471SEric Van Hensbergen */ 9902bad8471SEric Van Hensbergen 991bd238fb4SLatchesar Ionkov ino_t v9fs_qid2ino(struct p9_qid *qid) 9922bad8471SEric Van Hensbergen { 9932bad8471SEric Van Hensbergen u64 path = qid->path + 2; 9942bad8471SEric Van Hensbergen ino_t i = 0; 9952bad8471SEric Van Hensbergen 9962bad8471SEric Van Hensbergen if (sizeof(ino_t) == sizeof(path)) 9972bad8471SEric Van Hensbergen memcpy(&i, &path, sizeof(ino_t)); 9982bad8471SEric Van Hensbergen else 9992bad8471SEric Van Hensbergen i = (ino_t) (path ^ (path >> 32)); 10002bad8471SEric Van Hensbergen 10012bad8471SEric Van Hensbergen return i; 10022bad8471SEric Van Hensbergen } 10032bad8471SEric Van Hensbergen 10042bad8471SEric Van Hensbergen /** 10052bad8471SEric Van Hensbergen * v9fs_readlink - read a symlink's location (internal version) 10062bad8471SEric Van Hensbergen * @dentry: dentry for symlink 100773c592b9SEric Van Hensbergen * @buffer: buffer to load symlink location into 10082bad8471SEric Van Hensbergen * @buflen: length of buffer 10092bad8471SEric Van Hensbergen * 10102bad8471SEric Van Hensbergen */ 10112bad8471SEric Van Hensbergen 10122bad8471SEric Van Hensbergen static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 10132bad8471SEric Van Hensbergen { 1014bd238fb4SLatchesar Ionkov int retval; 10152bad8471SEric Van Hensbergen 1016bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1017bd238fb4SLatchesar Ionkov struct p9_fid *fid; 101851a87c55SEric Van Hensbergen struct p9_wstat *st; 10192bad8471SEric Van Hensbergen 1020bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 1021bd238fb4SLatchesar Ionkov retval = -EPERM; 1022bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 1023bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1024da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 1025da977b2cSEric Van Hensbergen return PTR_ERR(fid); 10262bad8471SEric Van Hensbergen 1027dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) 1028bd238fb4SLatchesar Ionkov return -EBADF; 10292bad8471SEric Van Hensbergen 1030bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 1031bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 1032bd238fb4SLatchesar Ionkov return PTR_ERR(st); 10332bad8471SEric Van Hensbergen 1034bd238fb4SLatchesar Ionkov if (!(st->mode & P9_DMSYMLINK)) { 10352bad8471SEric Van Hensbergen retval = -EINVAL; 1036bd238fb4SLatchesar Ionkov goto done; 10372bad8471SEric Van Hensbergen } 10382bad8471SEric Van Hensbergen 10392bad8471SEric Van Hensbergen /* copy extension buffer into buffer */ 104051a87c55SEric Van Hensbergen strncpy(buffer, st->extension, buflen); 10412bad8471SEric Van Hensbergen 1042bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 104351a87c55SEric Van Hensbergen "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); 1044bd238fb4SLatchesar Ionkov 10452511cd0bSMartin Stava retval = strnlen(buffer, buflen); 1046bd238fb4SLatchesar Ionkov done: 1047bd238fb4SLatchesar Ionkov kfree(st); 10482bad8471SEric Van Hensbergen return retval; 10492bad8471SEric Van Hensbergen } 10502bad8471SEric Van Hensbergen 10512bad8471SEric Van Hensbergen /** 10522bad8471SEric Van Hensbergen * v9fs_vfs_follow_link - follow a symlink path 10532bad8471SEric Van Hensbergen * @dentry: dentry for symlink 10542bad8471SEric Van Hensbergen * @nd: nameidata 10552bad8471SEric Van Hensbergen * 10562bad8471SEric Van Hensbergen */ 10572bad8471SEric Van Hensbergen 10582bad8471SEric Van Hensbergen static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 10592bad8471SEric Van Hensbergen { 10602bad8471SEric Van Hensbergen int len = 0; 10612bad8471SEric Van Hensbergen char *link = __getname(); 10622bad8471SEric Van Hensbergen 1063bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); 10642bad8471SEric Van Hensbergen 10652bad8471SEric Van Hensbergen if (!link) 10662bad8471SEric Van Hensbergen link = ERR_PTR(-ENOMEM); 10672bad8471SEric Van Hensbergen else { 106816cce6d2SLatchesar Ionkov len = v9fs_readlink(dentry, link, PATH_MAX); 10692bad8471SEric Van Hensbergen 10702bad8471SEric Van Hensbergen if (len < 0) { 1071ce44eeb6SDavi Arnaut __putname(link); 10722bad8471SEric Van Hensbergen link = ERR_PTR(len); 10732bad8471SEric Van Hensbergen } else 10742511cd0bSMartin Stava link[min(len, PATH_MAX-1)] = 0; 10752bad8471SEric Van Hensbergen } 10762bad8471SEric Van Hensbergen nd_set_link(nd, link); 10772bad8471SEric Van Hensbergen 10782bad8471SEric Van Hensbergen return NULL; 10792bad8471SEric Van Hensbergen } 10802bad8471SEric Van Hensbergen 10812bad8471SEric Van Hensbergen /** 10822bad8471SEric Van Hensbergen * v9fs_vfs_put_link - release a symlink path 10832bad8471SEric Van Hensbergen * @dentry: dentry for symlink 10842bad8471SEric Van Hensbergen * @nd: nameidata 1085ee443996SEric Van Hensbergen * @p: unused 10862bad8471SEric Van Hensbergen * 10872bad8471SEric Van Hensbergen */ 10882bad8471SEric Van Hensbergen 1089ee443996SEric Van Hensbergen static void 1090ee443996SEric Van Hensbergen v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 10912bad8471SEric Van Hensbergen { 10922bad8471SEric Van Hensbergen char *s = nd_get_link(nd); 10932bad8471SEric Van Hensbergen 10946ff23207SDuane Griffin P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, 10956ff23207SDuane Griffin IS_ERR(s) ? "<error>" : s); 10962bad8471SEric Van Hensbergen if (!IS_ERR(s)) 1097ce44eeb6SDavi Arnaut __putname(s); 10982bad8471SEric Van Hensbergen } 10992bad8471SEric Van Hensbergen 1100ee443996SEric Van Hensbergen /** 1101ee443996SEric Van Hensbergen * v9fs_vfs_mkspecial - create a special file 1102ee443996SEric Van Hensbergen * @dir: inode to create special file in 1103ee443996SEric Van Hensbergen * @dentry: dentry to create 1104ee443996SEric Van Hensbergen * @mode: mode to create special file 1105ee443996SEric Van Hensbergen * @extension: 9p2000.u format extension string representing special file 1106ee443996SEric Van Hensbergen * 1107ee443996SEric Van Hensbergen */ 1108ee443996SEric Van Hensbergen 1109531b1094SLatchesar Ionkov static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1110531b1094SLatchesar Ionkov int mode, const char *extension) 1111531b1094SLatchesar Ionkov { 1112bd238fb4SLatchesar Ionkov u32 perm; 1113531b1094SLatchesar Ionkov struct v9fs_session_info *v9ses; 1114bd238fb4SLatchesar Ionkov struct p9_fid *fid; 1115531b1094SLatchesar Ionkov 11166a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 1117dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) { 1118bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); 11196a3124a3SLatchesar Ionkov return -EPERM; 1120531b1094SLatchesar Ionkov } 1121531b1094SLatchesar Ionkov 1122da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 1123bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1124bd238fb4SLatchesar Ionkov P9_OREAD); 1125bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) 1126bd238fb4SLatchesar Ionkov return PTR_ERR(fid); 1127da977b2cSEric Van Hensbergen 1128bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 11296a3124a3SLatchesar Ionkov return 0; 1130531b1094SLatchesar Ionkov } 1131531b1094SLatchesar Ionkov 1132531b1094SLatchesar Ionkov /** 1133531b1094SLatchesar Ionkov * v9fs_vfs_symlink - helper function to create symlinks 1134531b1094SLatchesar Ionkov * @dir: directory inode containing symlink 1135531b1094SLatchesar Ionkov * @dentry: dentry for symlink 1136531b1094SLatchesar Ionkov * @symname: symlink data 1137531b1094SLatchesar Ionkov * 1138ee443996SEric Van Hensbergen * See Also: 9P2000.u RFC for more information 1139531b1094SLatchesar Ionkov * 1140531b1094SLatchesar Ionkov */ 1141531b1094SLatchesar Ionkov 1142531b1094SLatchesar Ionkov static int 1143531b1094SLatchesar Ionkov v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1144531b1094SLatchesar Ionkov { 1145bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, 1146bd238fb4SLatchesar Ionkov dentry->d_name.name, symname); 1147531b1094SLatchesar Ionkov 1148531b1094SLatchesar Ionkov return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1149531b1094SLatchesar Ionkov } 1150531b1094SLatchesar Ionkov 11512bad8471SEric Van Hensbergen /** 11522bad8471SEric Van Hensbergen * v9fs_vfs_link - create a hardlink 11532bad8471SEric Van Hensbergen * @old_dentry: dentry for file to link to 11542bad8471SEric Van Hensbergen * @dir: inode destination for new link 115573c592b9SEric Van Hensbergen * @dentry: dentry for link 11562bad8471SEric Van Hensbergen * 11572bad8471SEric Van Hensbergen */ 11582bad8471SEric Van Hensbergen 11592bad8471SEric Van Hensbergen static int 11602bad8471SEric Van Hensbergen v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 11612bad8471SEric Van Hensbergen struct dentry *dentry) 11622bad8471SEric Van Hensbergen { 1163531b1094SLatchesar Ionkov int retval; 1164bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 1165531b1094SLatchesar Ionkov char *name; 11662bad8471SEric Van Hensbergen 1167bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1168bd238fb4SLatchesar Ionkov " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 11692bad8471SEric Van Hensbergen old_dentry->d_name.name); 11702bad8471SEric Van Hensbergen 1171da977b2cSEric Van Hensbergen oldfid = v9fs_fid_clone(old_dentry); 1172da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 1173da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 11742bad8471SEric Van Hensbergen 1175531b1094SLatchesar Ionkov name = __getname(); 1176da977b2cSEric Van Hensbergen if (unlikely(!name)) { 1177da977b2cSEric Van Hensbergen retval = -ENOMEM; 1178da977b2cSEric Van Hensbergen goto clunk_fid; 1179da977b2cSEric Van Hensbergen } 11800710d36aSFlorin Malita 118116cce6d2SLatchesar Ionkov sprintf(name, "%d\n", oldfid->fid); 1182bd238fb4SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1183531b1094SLatchesar Ionkov __putname(name); 11842bad8471SEric Van Hensbergen 1185da977b2cSEric Van Hensbergen clunk_fid: 1186bd238fb4SLatchesar Ionkov p9_client_clunk(oldfid); 11872bad8471SEric Van Hensbergen return retval; 11882bad8471SEric Van Hensbergen } 11892bad8471SEric Van Hensbergen 11902bad8471SEric Van Hensbergen /** 11912bad8471SEric Van Hensbergen * v9fs_vfs_mknod - create a special file 11922bad8471SEric Van Hensbergen * @dir: inode destination for new link 11932bad8471SEric Van Hensbergen * @dentry: dentry for file 11942bad8471SEric Van Hensbergen * @mode: mode for creation 1195ee443996SEric Van Hensbergen * @rdev: device associated with special file 11962bad8471SEric Van Hensbergen * 11972bad8471SEric Van Hensbergen */ 11982bad8471SEric Van Hensbergen 11992bad8471SEric Van Hensbergen static int 12002bad8471SEric Van Hensbergen v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 12012bad8471SEric Van Hensbergen { 1202531b1094SLatchesar Ionkov int retval; 1203531b1094SLatchesar Ionkov char *name; 12042bad8471SEric Van Hensbergen 1205bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1206bd238fb4SLatchesar Ionkov " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 12072bad8471SEric Van Hensbergen dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 12082bad8471SEric Van Hensbergen 1209531b1094SLatchesar Ionkov if (!new_valid_dev(rdev)) 1210531b1094SLatchesar Ionkov return -EINVAL; 121173c592b9SEric Van Hensbergen 1212531b1094SLatchesar Ionkov name = __getname(); 1213c0291a05SEugene Teo if (!name) 1214c0291a05SEugene Teo return -ENOMEM; 12152bad8471SEric Van Hensbergen /* build extension */ 12162bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 1217531b1094SLatchesar Ionkov sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 12182bad8471SEric Van Hensbergen else if (S_ISCHR(mode)) 1219531b1094SLatchesar Ionkov sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 122073c592b9SEric Van Hensbergen else if (S_ISFIFO(mode)) 1221531b1094SLatchesar Ionkov *name = 0; 12222bad8471SEric Van Hensbergen else { 1223531b1094SLatchesar Ionkov __putname(name); 1224531b1094SLatchesar Ionkov return -EINVAL; 12252bad8471SEric Van Hensbergen } 12262bad8471SEric Van Hensbergen 1227531b1094SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1228531b1094SLatchesar Ionkov __putname(name); 12292bad8471SEric Van Hensbergen 12302bad8471SEric Van Hensbergen return retval; 12312bad8471SEric Van Hensbergen } 12322bad8471SEric Van Hensbergen 12339b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotu = { 12349b6533c9SSripathi Kodi .create = v9fs_vfs_create, 12359b6533c9SSripathi Kodi .lookup = v9fs_vfs_lookup, 12369b6533c9SSripathi Kodi .symlink = v9fs_vfs_symlink, 12379b6533c9SSripathi Kodi .link = v9fs_vfs_link, 12389b6533c9SSripathi Kodi .unlink = v9fs_vfs_unlink, 12399b6533c9SSripathi Kodi .mkdir = v9fs_vfs_mkdir, 12409b6533c9SSripathi Kodi .rmdir = v9fs_vfs_rmdir, 12419b6533c9SSripathi Kodi .mknod = v9fs_vfs_mknod, 12429b6533c9SSripathi Kodi .rename = v9fs_vfs_rename, 12439b6533c9SSripathi Kodi .getattr = v9fs_vfs_getattr, 12449b6533c9SSripathi Kodi .setattr = v9fs_vfs_setattr, 12459b6533c9SSripathi Kodi }; 12469b6533c9SSripathi Kodi 12479b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotl = { 12482bad8471SEric Van Hensbergen .create = v9fs_vfs_create, 12492bad8471SEric Van Hensbergen .lookup = v9fs_vfs_lookup, 12502bad8471SEric Van Hensbergen .symlink = v9fs_vfs_symlink, 12512bad8471SEric Van Hensbergen .link = v9fs_vfs_link, 12522bad8471SEric Van Hensbergen .unlink = v9fs_vfs_unlink, 12532bad8471SEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 12542bad8471SEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 12552bad8471SEric Van Hensbergen .mknod = v9fs_vfs_mknod, 12562bad8471SEric Van Hensbergen .rename = v9fs_vfs_rename, 12572bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 12582bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 12592bad8471SEric Van Hensbergen }; 12602bad8471SEric Van Hensbergen 1261754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations = { 1262b501611aSEric Van Hensbergen .create = v9fs_vfs_create, 1263b501611aSEric Van Hensbergen .lookup = v9fs_vfs_lookup, 1264b501611aSEric Van Hensbergen .unlink = v9fs_vfs_unlink, 1265b501611aSEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 1266b501611aSEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 1267b501611aSEric Van Hensbergen .mknod = v9fs_vfs_mknod, 1268b501611aSEric Van Hensbergen .rename = v9fs_vfs_rename, 1269b501611aSEric Van Hensbergen .getattr = v9fs_vfs_getattr, 1270b501611aSEric Van Hensbergen .setattr = v9fs_vfs_setattr, 1271b501611aSEric Van Hensbergen }; 1272b501611aSEric Van Hensbergen 1273754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations = { 12742bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 12752bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 12762bad8471SEric Van Hensbergen }; 12772bad8471SEric Van Hensbergen 12789b6533c9SSripathi Kodi static const struct inode_operations v9fs_file_inode_operations_dotl = { 12799b6533c9SSripathi Kodi .getattr = v9fs_vfs_getattr, 12809b6533c9SSripathi Kodi .setattr = v9fs_vfs_setattr, 12819b6533c9SSripathi Kodi }; 12829b6533c9SSripathi Kodi 1283754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations = { 1284204f2f0eSAl Viro .readlink = generic_readlink, 12852bad8471SEric Van Hensbergen .follow_link = v9fs_vfs_follow_link, 12862bad8471SEric Van Hensbergen .put_link = v9fs_vfs_put_link, 12872bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 12882bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 12892bad8471SEric Van Hensbergen }; 12909b6533c9SSripathi Kodi 12919b6533c9SSripathi Kodi static const struct inode_operations v9fs_symlink_inode_operations_dotl = { 12929b6533c9SSripathi Kodi .readlink = generic_readlink, 12939b6533c9SSripathi Kodi .follow_link = v9fs_vfs_follow_link, 12949b6533c9SSripathi Kodi .put_link = v9fs_vfs_put_link, 12959b6533c9SSripathi Kodi .getattr = v9fs_vfs_getattr, 12969b6533c9SSripathi Kodi .setattr = v9fs_vfs_setattr, 12979b6533c9SSripathi Kodi }; 1298