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; 47754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations_ext; 48754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations; 49754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations; 502bad8471SEric Van Hensbergen 512bad8471SEric Van Hensbergen /** 522bad8471SEric Van Hensbergen * unixmode2p9mode - convert unix mode bits to plan 9 532bad8471SEric Van Hensbergen * @v9ses: v9fs session information 542bad8471SEric Van Hensbergen * @mode: mode to convert 552bad8471SEric Van Hensbergen * 562bad8471SEric Van Hensbergen */ 572bad8471SEric Van Hensbergen 5873c592b9SEric Van Hensbergen static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) 592bad8471SEric Van Hensbergen { 602bad8471SEric Van Hensbergen int res; 612bad8471SEric Van Hensbergen res = mode & 0777; 622bad8471SEric Van Hensbergen if (S_ISDIR(mode)) 63bd238fb4SLatchesar Ionkov res |= P9_DMDIR; 64dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 652bad8471SEric Van Hensbergen if (S_ISLNK(mode)) 66bd238fb4SLatchesar Ionkov res |= P9_DMSYMLINK; 672bad8471SEric Van Hensbergen if (v9ses->nodev == 0) { 682bad8471SEric Van Hensbergen if (S_ISSOCK(mode)) 69bd238fb4SLatchesar Ionkov res |= P9_DMSOCKET; 702bad8471SEric Van Hensbergen if (S_ISFIFO(mode)) 71bd238fb4SLatchesar Ionkov res |= P9_DMNAMEDPIPE; 722bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 73bd238fb4SLatchesar Ionkov res |= P9_DMDEVICE; 742bad8471SEric Van Hensbergen if (S_ISCHR(mode)) 75bd238fb4SLatchesar Ionkov res |= P9_DMDEVICE; 762bad8471SEric Van Hensbergen } 772bad8471SEric Van Hensbergen 782bad8471SEric Van Hensbergen if ((mode & S_ISUID) == S_ISUID) 79bd238fb4SLatchesar Ionkov res |= P9_DMSETUID; 802bad8471SEric Van Hensbergen if ((mode & S_ISGID) == S_ISGID) 81bd238fb4SLatchesar Ionkov res |= P9_DMSETGID; 82d199d652SAnthony Liguori if ((mode & S_ISVTX) == S_ISVTX) 83d199d652SAnthony Liguori res |= P9_DMSETVTX; 84bd238fb4SLatchesar Ionkov if ((mode & P9_DMLINK)) 85bd238fb4SLatchesar Ionkov res |= P9_DMLINK; 862bad8471SEric Van Hensbergen } 872bad8471SEric Van Hensbergen 882bad8471SEric Van Hensbergen return res; 892bad8471SEric Van Hensbergen } 902bad8471SEric Van Hensbergen 912bad8471SEric Van Hensbergen /** 922bad8471SEric Van Hensbergen * p9mode2unixmode- convert plan9 mode bits to unix mode bits 932bad8471SEric Van Hensbergen * @v9ses: v9fs session information 942bad8471SEric Van Hensbergen * @mode: mode to convert 952bad8471SEric Van Hensbergen * 962bad8471SEric Van Hensbergen */ 972bad8471SEric Van Hensbergen 9873c592b9SEric Van Hensbergen static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) 992bad8471SEric Van Hensbergen { 1002bad8471SEric Van Hensbergen int res; 1012bad8471SEric Van Hensbergen 1022bad8471SEric Van Hensbergen res = mode & 0777; 1032bad8471SEric Van Hensbergen 104bd238fb4SLatchesar Ionkov if ((mode & P9_DMDIR) == P9_DMDIR) 1052bad8471SEric Van Hensbergen res |= S_IFDIR; 106dd6102fbSSripathi Kodi else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) 1072bad8471SEric Van Hensbergen res |= S_IFLNK; 108dd6102fbSSripathi Kodi else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) 1092bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1102bad8471SEric Van Hensbergen res |= S_IFSOCK; 111dd6102fbSSripathi Kodi else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) 1122bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1132bad8471SEric Van Hensbergen res |= S_IFIFO; 114dd6102fbSSripathi Kodi else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) 1152bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1162bad8471SEric Van Hensbergen res |= S_IFBLK; 1172bad8471SEric Van Hensbergen else 1182bad8471SEric Van Hensbergen res |= S_IFREG; 1192bad8471SEric Van Hensbergen 120dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 121bd238fb4SLatchesar Ionkov if ((mode & P9_DMSETUID) == P9_DMSETUID) 1222bad8471SEric Van Hensbergen res |= S_ISUID; 1232bad8471SEric Van Hensbergen 124bd238fb4SLatchesar Ionkov if ((mode & P9_DMSETGID) == P9_DMSETGID) 1252bad8471SEric Van Hensbergen res |= S_ISGID; 126d199d652SAnthony Liguori 127d199d652SAnthony Liguori if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 128d199d652SAnthony Liguori res |= S_ISVTX; 1292bad8471SEric Van Hensbergen } 1302bad8471SEric Van Hensbergen 1312bad8471SEric Van Hensbergen return res; 1322bad8471SEric Van Hensbergen } 1332bad8471SEric Van Hensbergen 134ee443996SEric Van Hensbergen /** 135ee443996SEric Van Hensbergen * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 136ee443996SEric Van Hensbergen * @uflags: flags to convert 1372e4bef41SEric Van Hensbergen * @extended: if .u extensions are active 138ee443996SEric Van Hensbergen */ 139ee443996SEric Van Hensbergen 1402e4bef41SEric Van Hensbergen int v9fs_uflags2omode(int uflags, int extended) 1416a3124a3SLatchesar Ionkov { 1426a3124a3SLatchesar Ionkov int ret; 1436a3124a3SLatchesar Ionkov 1446a3124a3SLatchesar Ionkov ret = 0; 1456a3124a3SLatchesar Ionkov switch (uflags&3) { 1466a3124a3SLatchesar Ionkov default: 1476a3124a3SLatchesar Ionkov case O_RDONLY: 148bd238fb4SLatchesar Ionkov ret = P9_OREAD; 1496a3124a3SLatchesar Ionkov break; 1506a3124a3SLatchesar Ionkov 1516a3124a3SLatchesar Ionkov case O_WRONLY: 152bd238fb4SLatchesar Ionkov ret = P9_OWRITE; 1536a3124a3SLatchesar Ionkov break; 1546a3124a3SLatchesar Ionkov 1556a3124a3SLatchesar Ionkov case O_RDWR: 156bd238fb4SLatchesar Ionkov ret = P9_ORDWR; 1576a3124a3SLatchesar Ionkov break; 1586a3124a3SLatchesar Ionkov } 1596a3124a3SLatchesar Ionkov 1606a3124a3SLatchesar Ionkov if (uflags & O_TRUNC) 161bd238fb4SLatchesar Ionkov ret |= P9_OTRUNC; 1626a3124a3SLatchesar Ionkov 1632e4bef41SEric Van Hensbergen if (extended) { 1642e4bef41SEric Van Hensbergen if (uflags & O_EXCL) 1652e4bef41SEric Van Hensbergen ret |= P9_OEXCL; 1662e4bef41SEric Van Hensbergen 1676a3124a3SLatchesar Ionkov if (uflags & O_APPEND) 168bd238fb4SLatchesar Ionkov ret |= P9_OAPPEND; 1692e4bef41SEric Van Hensbergen } 1706a3124a3SLatchesar Ionkov 1716a3124a3SLatchesar Ionkov return ret; 1726a3124a3SLatchesar Ionkov } 1736a3124a3SLatchesar Ionkov 1742bad8471SEric Van Hensbergen /** 175531b1094SLatchesar Ionkov * v9fs_blank_wstat - helper function to setup a 9P stat structure 176531b1094SLatchesar Ionkov * @wstat: structure to initialize 1772bad8471SEric Van Hensbergen * 1782bad8471SEric Van Hensbergen */ 1792bad8471SEric Van Hensbergen 1807a4439c4SM. Mohan Kumar void 181bd238fb4SLatchesar Ionkov v9fs_blank_wstat(struct p9_wstat *wstat) 1822bad8471SEric Van Hensbergen { 183531b1094SLatchesar Ionkov wstat->type = ~0; 184531b1094SLatchesar Ionkov wstat->dev = ~0; 185531b1094SLatchesar Ionkov wstat->qid.type = ~0; 186531b1094SLatchesar Ionkov wstat->qid.version = ~0; 187531b1094SLatchesar Ionkov *((long long *)&wstat->qid.path) = ~0; 188531b1094SLatchesar Ionkov wstat->mode = ~0; 189531b1094SLatchesar Ionkov wstat->atime = ~0; 190531b1094SLatchesar Ionkov wstat->mtime = ~0; 191531b1094SLatchesar Ionkov wstat->length = ~0; 192531b1094SLatchesar Ionkov wstat->name = NULL; 193531b1094SLatchesar Ionkov wstat->uid = NULL; 194531b1094SLatchesar Ionkov wstat->gid = NULL; 195531b1094SLatchesar Ionkov wstat->muid = NULL; 196531b1094SLatchesar Ionkov wstat->n_uid = ~0; 197531b1094SLatchesar Ionkov wstat->n_gid = ~0; 198531b1094SLatchesar Ionkov wstat->n_muid = ~0; 199531b1094SLatchesar Ionkov wstat->extension = NULL; 2002bad8471SEric Van Hensbergen } 2012bad8471SEric Van Hensbergen 20260e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 20360e78d2cSAbhishek Kulkarni /** 20460e78d2cSAbhishek Kulkarni * v9fs_alloc_inode - helper function to allocate an inode 20560e78d2cSAbhishek Kulkarni * This callback is executed before setting up the inode so that we 20660e78d2cSAbhishek Kulkarni * can associate a vcookie with each inode. 20760e78d2cSAbhishek Kulkarni * 20860e78d2cSAbhishek Kulkarni */ 20960e78d2cSAbhishek Kulkarni 21060e78d2cSAbhishek Kulkarni struct inode *v9fs_alloc_inode(struct super_block *sb) 21160e78d2cSAbhishek Kulkarni { 21260e78d2cSAbhishek Kulkarni struct v9fs_cookie *vcookie; 21360e78d2cSAbhishek Kulkarni vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache, 21460e78d2cSAbhishek Kulkarni GFP_KERNEL); 21560e78d2cSAbhishek Kulkarni if (!vcookie) 21660e78d2cSAbhishek Kulkarni return NULL; 21760e78d2cSAbhishek Kulkarni 21860e78d2cSAbhishek Kulkarni vcookie->fscache = NULL; 21960e78d2cSAbhishek Kulkarni vcookie->qid = NULL; 22060e78d2cSAbhishek Kulkarni spin_lock_init(&vcookie->lock); 22160e78d2cSAbhishek Kulkarni return &vcookie->inode; 22260e78d2cSAbhishek Kulkarni } 22360e78d2cSAbhishek Kulkarni 22460e78d2cSAbhishek Kulkarni /** 22560e78d2cSAbhishek Kulkarni * v9fs_destroy_inode - destroy an inode 22660e78d2cSAbhishek Kulkarni * 22760e78d2cSAbhishek Kulkarni */ 22860e78d2cSAbhishek Kulkarni 22960e78d2cSAbhishek Kulkarni void v9fs_destroy_inode(struct inode *inode) 23060e78d2cSAbhishek Kulkarni { 23160e78d2cSAbhishek Kulkarni kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode)); 23260e78d2cSAbhishek Kulkarni } 23360e78d2cSAbhishek Kulkarni #endif 23460e78d2cSAbhishek Kulkarni 2352bad8471SEric Van Hensbergen /** 2362bad8471SEric Van Hensbergen * v9fs_get_inode - helper function to setup an inode 2372bad8471SEric Van Hensbergen * @sb: superblock 2382bad8471SEric Van Hensbergen * @mode: mode to setup inode with 2392bad8471SEric Van Hensbergen * 2402bad8471SEric Van Hensbergen */ 2412bad8471SEric Van Hensbergen 2422bad8471SEric Van Hensbergen struct inode *v9fs_get_inode(struct super_block *sb, int mode) 2432bad8471SEric Van Hensbergen { 2442bb54115SAbhishek Kulkarni int err; 2456a3124a3SLatchesar Ionkov struct inode *inode; 246b501611aSEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 2472bad8471SEric Van Hensbergen 248bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 2492bad8471SEric Van Hensbergen 2502bad8471SEric Van Hensbergen inode = new_inode(sb); 2512bb54115SAbhishek Kulkarni if (!inode) { 2522bb54115SAbhishek Kulkarni P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); 25348559b4cSAbhishek Kulkarni return ERR_PTR(-ENOMEM); 2542bb54115SAbhishek Kulkarni } 2552bb54115SAbhishek Kulkarni 2562bad8471SEric Van Hensbergen inode->i_mode = mode; 257f8b9d53aSDavid Howells inode->i_uid = current_fsuid(); 258f8b9d53aSDavid Howells inode->i_gid = current_fsgid(); 2592bad8471SEric Van Hensbergen inode->i_blocks = 0; 2602bad8471SEric Van Hensbergen inode->i_rdev = 0; 2612bad8471SEric Van Hensbergen inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 262147b31cfSEric Van Hensbergen inode->i_mapping->a_ops = &v9fs_addr_operations; 2632bad8471SEric Van Hensbergen 2642bad8471SEric Van Hensbergen switch (mode & S_IFMT) { 2652bad8471SEric Van Hensbergen case S_IFIFO: 2662bad8471SEric Van Hensbergen case S_IFBLK: 2672bad8471SEric Van Hensbergen case S_IFCHR: 2682bad8471SEric Van Hensbergen case S_IFSOCK: 269dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) { 270bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 271bd238fb4SLatchesar Ionkov "special files without extended mode\n"); 2722bb54115SAbhishek Kulkarni err = -EINVAL; 2732bb54115SAbhishek Kulkarni goto error; 274b501611aSEric Van Hensbergen } 2752bb54115SAbhishek Kulkarni init_special_inode(inode, inode->i_mode, inode->i_rdev); 2765d58bec5SEric Van Hensbergen break; 2772bad8471SEric Van Hensbergen case S_IFREG: 2782bad8471SEric Van Hensbergen inode->i_op = &v9fs_file_inode_operations; 2792bad8471SEric Van Hensbergen inode->i_fop = &v9fs_file_operations; 2802bad8471SEric Van Hensbergen break; 281b501611aSEric Van Hensbergen case S_IFLNK: 282dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) { 283bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 284bd238fb4SLatchesar Ionkov "extended modes used w/o 9P2000.u\n"); 2852bb54115SAbhishek Kulkarni err = -EINVAL; 2862bb54115SAbhishek Kulkarni goto error; 287b501611aSEric Van Hensbergen } 288b501611aSEric Van Hensbergen inode->i_op = &v9fs_symlink_inode_operations; 289b501611aSEric Van Hensbergen break; 2902bad8471SEric Van Hensbergen case S_IFDIR: 291d8c76e6fSDave Hansen inc_nlink(inode); 292dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) 293b501611aSEric Van Hensbergen inode->i_op = &v9fs_dir_inode_operations_ext; 294b501611aSEric Van Hensbergen else 2952bad8471SEric Van Hensbergen inode->i_op = &v9fs_dir_inode_operations; 2962bad8471SEric Van Hensbergen inode->i_fop = &v9fs_dir_operations; 2972bad8471SEric Van Hensbergen break; 2982bad8471SEric Van Hensbergen default: 2992bb54115SAbhishek Kulkarni P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 3002bad8471SEric Van Hensbergen mode, mode & S_IFMT); 3012bb54115SAbhishek Kulkarni err = -EINVAL; 3022bb54115SAbhishek Kulkarni goto error; 3032bad8471SEric Van Hensbergen } 3042bb54115SAbhishek Kulkarni 3052bad8471SEric Van Hensbergen return inode; 3062bb54115SAbhishek Kulkarni 3072bb54115SAbhishek Kulkarni error: 3082bb54115SAbhishek Kulkarni iput(inode); 3092bb54115SAbhishek Kulkarni return ERR_PTR(err); 3102bad8471SEric Van Hensbergen } 3112bad8471SEric Van Hensbergen 312bd238fb4SLatchesar Ionkov /* 3136a3124a3SLatchesar Ionkov static struct v9fs_fid* 3146a3124a3SLatchesar Ionkov v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 3156a3124a3SLatchesar Ionkov { 3166a3124a3SLatchesar Ionkov int err; 317736c4b85SMika Kukkonen int nfid; 3186a3124a3SLatchesar Ionkov struct v9fs_fid *ret; 3196a3124a3SLatchesar Ionkov struct v9fs_fcall *fcall; 3200b8dd177SLatchesar Ionkov 3216a3124a3SLatchesar Ionkov nfid = v9fs_get_idpool(&v9ses->fidpool); 3226a3124a3SLatchesar Ionkov if (nfid < 0) { 3230b8dd177SLatchesar Ionkov eprintk(KERN_WARNING, "no free fids available\n"); 324731805b4SLatchesar Ionkov return ERR_PTR(-ENOSPC); 3250b8dd177SLatchesar Ionkov } 3260b8dd177SLatchesar Ionkov 3276a3124a3SLatchesar Ionkov err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 3286a3124a3SLatchesar Ionkov &fcall); 3296a3124a3SLatchesar Ionkov 3306a3124a3SLatchesar Ionkov if (err < 0) { 33141e5a6acSLatchesar Ionkov if (fcall && fcall->id == RWALK) 33241e5a6acSLatchesar Ionkov goto clunk_fid; 33341e5a6acSLatchesar Ionkov 3346a3124a3SLatchesar Ionkov PRINT_FCALL_ERROR("walk error", fcall); 3356a3124a3SLatchesar Ionkov v9fs_put_idpool(nfid, &v9ses->fidpool); 3366a3124a3SLatchesar Ionkov goto error; 3370b8dd177SLatchesar Ionkov } 3386a3124a3SLatchesar Ionkov 3393cf6429aSLatchesar Ionkov kfree(fcall); 3403cf6429aSLatchesar Ionkov fcall = NULL; 3416a3124a3SLatchesar Ionkov ret = v9fs_fid_create(v9ses, nfid); 3426a3124a3SLatchesar Ionkov if (!ret) { 3436a3124a3SLatchesar Ionkov err = -ENOMEM; 3446a3124a3SLatchesar Ionkov goto clunk_fid; 3450b8dd177SLatchesar Ionkov } 3462bad8471SEric Van Hensbergen 3476a3124a3SLatchesar Ionkov err = v9fs_fid_insert(ret, dentry); 3486a3124a3SLatchesar Ionkov if (err < 0) { 3496a3124a3SLatchesar Ionkov v9fs_fid_destroy(ret); 3506a3124a3SLatchesar Ionkov goto clunk_fid; 3516a3124a3SLatchesar Ionkov } 3522bad8471SEric Van Hensbergen 3536a3124a3SLatchesar Ionkov return ret; 3546a3124a3SLatchesar Ionkov 3556a3124a3SLatchesar Ionkov clunk_fid: 3566a3124a3SLatchesar Ionkov v9fs_t_clunk(v9ses, nfid); 3576a3124a3SLatchesar Ionkov 3586a3124a3SLatchesar Ionkov error: 3596a3124a3SLatchesar Ionkov kfree(fcall); 3606a3124a3SLatchesar Ionkov return ERR_PTR(err); 3616a3124a3SLatchesar Ionkov } 362bd238fb4SLatchesar Ionkov */ 3636a3124a3SLatchesar Ionkov 36460e78d2cSAbhishek Kulkarni 36560e78d2cSAbhishek Kulkarni /** 36660e78d2cSAbhishek Kulkarni * v9fs_clear_inode - release an inode 36760e78d2cSAbhishek Kulkarni * @inode: inode to release 36860e78d2cSAbhishek Kulkarni * 36960e78d2cSAbhishek Kulkarni */ 37060e78d2cSAbhishek Kulkarni void v9fs_clear_inode(struct inode *inode) 37160e78d2cSAbhishek Kulkarni { 37260e78d2cSAbhishek Kulkarni filemap_fdatawrite(inode->i_mapping); 37360e78d2cSAbhishek Kulkarni 37460e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 37560e78d2cSAbhishek Kulkarni v9fs_cache_inode_put_cookie(inode); 37660e78d2cSAbhishek Kulkarni #endif 37760e78d2cSAbhishek Kulkarni } 37860e78d2cSAbhishek Kulkarni 379ee443996SEric Van Hensbergen /** 380ee443996SEric Van Hensbergen * v9fs_inode_from_fid - populate an inode by issuing a attribute request 381ee443996SEric Van Hensbergen * @v9ses: session information 382ee443996SEric Van Hensbergen * @fid: fid to issue attribute request for 383ee443996SEric Van Hensbergen * @sb: superblock on which to create inode 384ee443996SEric Van Hensbergen * 385ee443996SEric Van Hensbergen */ 386ee443996SEric Van Hensbergen 3875174fdabSLatchesar Ionkov static struct inode * 388bd238fb4SLatchesar Ionkov v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 3896a3124a3SLatchesar Ionkov struct super_block *sb) 3906a3124a3SLatchesar Ionkov { 3916a3124a3SLatchesar Ionkov int err, umode; 3926a3124a3SLatchesar Ionkov struct inode *ret; 39351a87c55SEric Van Hensbergen struct p9_wstat *st; 3946a3124a3SLatchesar Ionkov 3956a3124a3SLatchesar Ionkov ret = NULL; 396bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 39702bc3567SAbhishek Kulkarni if (IS_ERR(st)) 39802bc3567SAbhishek Kulkarni return ERR_CAST(st); 3992bad8471SEric Van Hensbergen 400bd238fb4SLatchesar Ionkov umode = p9mode2unixmode(v9ses, st->mode); 4016a3124a3SLatchesar Ionkov ret = v9fs_get_inode(sb, umode); 4026a3124a3SLatchesar Ionkov if (IS_ERR(ret)) { 4036a3124a3SLatchesar Ionkov err = PTR_ERR(ret); 4046a3124a3SLatchesar Ionkov goto error; 4052bad8471SEric Van Hensbergen } 4062bad8471SEric Van Hensbergen 407bd238fb4SLatchesar Ionkov v9fs_stat2inode(st, ret, sb); 408bd238fb4SLatchesar Ionkov ret->i_ino = v9fs_qid2ino(&st->qid); 40960e78d2cSAbhishek Kulkarni 41060e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 41160e78d2cSAbhishek Kulkarni v9fs_vcookie_set_qid(ret, &st->qid); 41260e78d2cSAbhishek Kulkarni v9fs_cache_inode_get_cookie(ret); 41360e78d2cSAbhishek Kulkarni #endif 41402bc3567SAbhishek Kulkarni p9stat_free(st); 415bd238fb4SLatchesar Ionkov kfree(st); 41660e78d2cSAbhishek Kulkarni 4176a3124a3SLatchesar Ionkov return ret; 4182bad8471SEric Van Hensbergen 4196a3124a3SLatchesar Ionkov error: 42002bc3567SAbhishek Kulkarni p9stat_free(st); 421bd238fb4SLatchesar Ionkov kfree(st); 4226a3124a3SLatchesar Ionkov return ERR_PTR(err); 4232bad8471SEric Van Hensbergen } 4242bad8471SEric Van Hensbergen 4252bad8471SEric Van Hensbergen /** 4262bad8471SEric Van Hensbergen * v9fs_remove - helper function to remove files and directories 42773c592b9SEric Van Hensbergen * @dir: directory inode that is being deleted 42873c592b9SEric Van Hensbergen * @file: dentry that is being deleted 42973c592b9SEric Van Hensbergen * @rmdir: removing a directory 4302bad8471SEric Van Hensbergen * 4312bad8471SEric Van Hensbergen */ 4322bad8471SEric Van Hensbergen 4332bad8471SEric Van Hensbergen static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) 4342bad8471SEric Van Hensbergen { 435bd238fb4SLatchesar Ionkov struct inode *file_inode; 436bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 437bd238fb4SLatchesar Ionkov struct p9_fid *v9fid; 4382bad8471SEric Van Hensbergen 439bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, 4402bad8471SEric Van Hensbergen rmdir); 4412bad8471SEric Van Hensbergen 4422bad8471SEric Van Hensbergen file_inode = file->d_inode; 4432bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(file_inode); 444c959df9fSLatchesar Ionkov v9fid = v9fs_fid_clone(file); 445da977b2cSEric Van Hensbergen if (IS_ERR(v9fid)) 446da977b2cSEric Van Hensbergen return PTR_ERR(v9fid); 4472bad8471SEric Van Hensbergen 448bd238fb4SLatchesar Ionkov return p9_client_remove(v9fid); 4492bad8471SEric Van Hensbergen } 4502bad8471SEric Van Hensbergen 4516a3124a3SLatchesar Ionkov static int 4526a3124a3SLatchesar Ionkov v9fs_open_created(struct inode *inode, struct file *file) 4536a3124a3SLatchesar Ionkov { 4546a3124a3SLatchesar Ionkov return 0; 4556a3124a3SLatchesar Ionkov } 4566a3124a3SLatchesar Ionkov 457bd238fb4SLatchesar Ionkov 458bd238fb4SLatchesar Ionkov /** 459bd238fb4SLatchesar Ionkov * v9fs_create - Create a file 460ee443996SEric Van Hensbergen * @v9ses: session information 461ee443996SEric Van Hensbergen * @dir: directory that dentry is being created in 462bd238fb4SLatchesar Ionkov * @dentry: dentry that is being created 4630e15597eSAbhishek Kulkarni * @extension: 9p2000.u extension string to support devices, etc. 464bd238fb4SLatchesar Ionkov * @perm: create permissions 465bd238fb4SLatchesar Ionkov * @mode: open mode 466bd238fb4SLatchesar Ionkov * 467bd238fb4SLatchesar Ionkov */ 468bd238fb4SLatchesar Ionkov static struct p9_fid * 469bd238fb4SLatchesar Ionkov v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 470bd238fb4SLatchesar Ionkov struct dentry *dentry, char *extension, u32 perm, u8 mode) 471bd238fb4SLatchesar Ionkov { 472bd238fb4SLatchesar Ionkov int err; 473bd238fb4SLatchesar Ionkov char *name; 474bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *ofid, *fid; 475bd238fb4SLatchesar Ionkov struct inode *inode; 476bd238fb4SLatchesar Ionkov 47751a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 47851a87c55SEric Van Hensbergen 479bd238fb4SLatchesar Ionkov err = 0; 480bd238fb4SLatchesar Ionkov ofid = NULL; 481bd238fb4SLatchesar Ionkov fid = NULL; 482bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 483bd238fb4SLatchesar Ionkov dfid = v9fs_fid_clone(dentry->d_parent); 484bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) { 485bd238fb4SLatchesar Ionkov err = PTR_ERR(dfid); 48651a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "fid clone failed %d\n", err); 487bd238fb4SLatchesar Ionkov dfid = NULL; 488bd238fb4SLatchesar Ionkov goto error; 489bd238fb4SLatchesar Ionkov } 490bd238fb4SLatchesar Ionkov 491bd238fb4SLatchesar Ionkov /* clone a fid to use for creation */ 492bd238fb4SLatchesar Ionkov ofid = p9_client_walk(dfid, 0, NULL, 1); 493bd238fb4SLatchesar Ionkov if (IS_ERR(ofid)) { 494bd238fb4SLatchesar Ionkov err = PTR_ERR(ofid); 49551a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 496bd238fb4SLatchesar Ionkov ofid = NULL; 497bd238fb4SLatchesar Ionkov goto error; 498bd238fb4SLatchesar Ionkov } 499bd238fb4SLatchesar Ionkov 500bd238fb4SLatchesar Ionkov err = p9_client_fcreate(ofid, name, perm, mode, extension); 50151a87c55SEric Van Hensbergen if (err < 0) { 50251a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 503bd238fb4SLatchesar Ionkov goto error; 50451a87c55SEric Van Hensbergen } 505bd238fb4SLatchesar Ionkov 506bd238fb4SLatchesar Ionkov /* now walk from the parent so we can get unopened fid */ 507bd238fb4SLatchesar Ionkov fid = p9_client_walk(dfid, 1, &name, 0); 508bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 509bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 51051a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 511bd238fb4SLatchesar Ionkov fid = NULL; 512bd238fb4SLatchesar Ionkov goto error; 513bd238fb4SLatchesar Ionkov } else 514bd238fb4SLatchesar Ionkov dfid = NULL; 515bd238fb4SLatchesar Ionkov 516bd238fb4SLatchesar Ionkov /* instantiate inode and assign the unopened fid to the dentry */ 517bd238fb4SLatchesar Ionkov inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 518bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 519bd238fb4SLatchesar Ionkov err = PTR_ERR(inode); 52051a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); 521bd238fb4SLatchesar Ionkov goto error; 522bd238fb4SLatchesar Ionkov } 523bd238fb4SLatchesar Ionkov 524bd238fb4SLatchesar Ionkov if (v9ses->cache) 525bd238fb4SLatchesar Ionkov dentry->d_op = &v9fs_cached_dentry_operations; 526bd238fb4SLatchesar Ionkov else 527bd238fb4SLatchesar Ionkov dentry->d_op = &v9fs_dentry_operations; 528bd238fb4SLatchesar Ionkov 529bd238fb4SLatchesar Ionkov d_instantiate(dentry, inode); 53050fb6d2bSAbhishek Kulkarni err = v9fs_fid_add(dentry, fid); 53150fb6d2bSAbhishek Kulkarni if (err < 0) 53250fb6d2bSAbhishek Kulkarni goto error; 53350fb6d2bSAbhishek Kulkarni 534bd238fb4SLatchesar Ionkov return ofid; 535bd238fb4SLatchesar Ionkov 536bd238fb4SLatchesar Ionkov error: 537bd238fb4SLatchesar Ionkov if (dfid) 538bd238fb4SLatchesar Ionkov p9_client_clunk(dfid); 539bd238fb4SLatchesar Ionkov 540bd238fb4SLatchesar Ionkov if (ofid) 541bd238fb4SLatchesar Ionkov p9_client_clunk(ofid); 542bd238fb4SLatchesar Ionkov 543bd238fb4SLatchesar Ionkov if (fid) 544bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 545bd238fb4SLatchesar Ionkov 546bd238fb4SLatchesar Ionkov return ERR_PTR(err); 547bd238fb4SLatchesar Ionkov } 548bd238fb4SLatchesar Ionkov 5492bad8471SEric Van Hensbergen /** 5502bad8471SEric Van Hensbergen * v9fs_vfs_create - VFS hook to create files 551ee443996SEric Van Hensbergen * @dir: directory inode that is being created 5522bad8471SEric Van Hensbergen * @dentry: dentry that is being deleted 5536a3124a3SLatchesar Ionkov * @mode: create permissions 5542bad8471SEric Van Hensbergen * @nd: path information 5552bad8471SEric Van Hensbergen * 5562bad8471SEric Van Hensbergen */ 5572bad8471SEric Van Hensbergen 5582bad8471SEric Van Hensbergen static int 5596a3124a3SLatchesar Ionkov v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 5602bad8471SEric Van Hensbergen struct nameidata *nd) 5612bad8471SEric Van Hensbergen { 5626a3124a3SLatchesar Ionkov int err; 563bd238fb4SLatchesar Ionkov u32 perm; 5646a3124a3SLatchesar Ionkov int flags; 5656a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 566bd238fb4SLatchesar Ionkov struct p9_fid *fid; 5676a3124a3SLatchesar Ionkov struct file *filp; 5686a3124a3SLatchesar Ionkov 569bd238fb4SLatchesar Ionkov err = 0; 570bd238fb4SLatchesar Ionkov fid = NULL; 5716a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 572da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 5736a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) 5746a3124a3SLatchesar Ionkov flags = nd->intent.open.flags - 1; 5756a3124a3SLatchesar Ionkov else 5766a3124a3SLatchesar Ionkov flags = O_RDWR; 5776a3124a3SLatchesar Ionkov 578bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 579dd6102fbSSripathi Kodi v9fs_uflags2omode(flags, 580dd6102fbSSripathi Kodi v9fs_proto_dotu(v9ses))); 581bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 582bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 583bd238fb4SLatchesar Ionkov fid = NULL; 5846a3124a3SLatchesar Ionkov goto error; 5856a3124a3SLatchesar Ionkov } 5866a3124a3SLatchesar Ionkov 587bd238fb4SLatchesar Ionkov /* if we are opening a file, assign the open fid to the file */ 5886a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) { 5896a3124a3SLatchesar Ionkov filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); 5906a3124a3SLatchesar Ionkov if (IS_ERR(filp)) { 591bd238fb4SLatchesar Ionkov err = PTR_ERR(filp); 592bd238fb4SLatchesar Ionkov goto error; 5936a3124a3SLatchesar Ionkov } 5946a3124a3SLatchesar Ionkov 595bd238fb4SLatchesar Ionkov filp->private_data = fid; 596bd238fb4SLatchesar Ionkov } else 597bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 5986a3124a3SLatchesar Ionkov 5996a3124a3SLatchesar Ionkov return 0; 6006a3124a3SLatchesar Ionkov 6016a3124a3SLatchesar Ionkov error: 602bd238fb4SLatchesar Ionkov if (fid) 603bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6046a3124a3SLatchesar Ionkov 6056a3124a3SLatchesar Ionkov return err; 6062bad8471SEric Van Hensbergen } 6072bad8471SEric Van Hensbergen 6082bad8471SEric Van Hensbergen /** 6092bad8471SEric Van Hensbergen * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 610ee443996SEric Van Hensbergen * @dir: inode that is being unlinked 6112bad8471SEric Van Hensbergen * @dentry: dentry that is being unlinked 6122bad8471SEric Van Hensbergen * @mode: mode for new directory 6132bad8471SEric Van Hensbergen * 6142bad8471SEric Van Hensbergen */ 6152bad8471SEric Van Hensbergen 6166a3124a3SLatchesar Ionkov static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 6172bad8471SEric Van Hensbergen { 6186a3124a3SLatchesar Ionkov int err; 619bd238fb4SLatchesar Ionkov u32 perm; 6206a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 621bd238fb4SLatchesar Ionkov struct p9_fid *fid; 6226a3124a3SLatchesar Ionkov 623bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 624bd238fb4SLatchesar Ionkov err = 0; 6256a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 6266a3124a3SLatchesar Ionkov perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 627bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 628bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 629bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 630bd238fb4SLatchesar Ionkov fid = NULL; 6316a3124a3SLatchesar Ionkov } 6326a3124a3SLatchesar Ionkov 633bd238fb4SLatchesar Ionkov if (fid) 634bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6356a3124a3SLatchesar Ionkov 6366a3124a3SLatchesar Ionkov return err; 6372bad8471SEric Van Hensbergen } 6382bad8471SEric Van Hensbergen 6392bad8471SEric Van Hensbergen /** 6402bad8471SEric Van Hensbergen * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 6412bad8471SEric Van Hensbergen * @dir: inode that is being walked from 6422bad8471SEric Van Hensbergen * @dentry: dentry that is being walked to? 6432bad8471SEric Van Hensbergen * @nameidata: path data 6442bad8471SEric Van Hensbergen * 6452bad8471SEric Van Hensbergen */ 6462bad8471SEric Van Hensbergen 6472bad8471SEric Van Hensbergen static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 6482bad8471SEric Van Hensbergen struct nameidata *nameidata) 6492bad8471SEric Van Hensbergen { 6502bad8471SEric Van Hensbergen struct super_block *sb; 6512bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses; 652bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *fid; 6532bad8471SEric Van Hensbergen struct inode *inode; 654bd238fb4SLatchesar Ionkov char *name; 6552bad8471SEric Van Hensbergen int result = 0; 6562bad8471SEric Van Hensbergen 657bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 658731805b4SLatchesar Ionkov dir, dentry->d_name.name, dentry, nameidata); 6592bad8471SEric Van Hensbergen 6602bad8471SEric Van Hensbergen sb = dir->i_sb; 6612bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(dir); 662bd238fb4SLatchesar Ionkov dfid = v9fs_fid_lookup(dentry->d_parent); 663bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) 664e231c2eeSDavid Howells return ERR_CAST(dfid); 6652bad8471SEric Van Hensbergen 666bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 667bd238fb4SLatchesar Ionkov fid = p9_client_walk(dfid, 1, &name, 1); 668bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 669bd238fb4SLatchesar Ionkov result = PTR_ERR(fid); 6702bad8471SEric Van Hensbergen if (result == -ENOENT) { 6712bad8471SEric Van Hensbergen d_add(dentry, NULL); 6722bad8471SEric Van Hensbergen return NULL; 6732bad8471SEric Van Hensbergen } 6742bad8471SEric Van Hensbergen 675bd238fb4SLatchesar Ionkov return ERR_PTR(result); 6762bad8471SEric Van Hensbergen } 6772bad8471SEric Van Hensbergen 678bd238fb4SLatchesar Ionkov inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 679bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 680bd238fb4SLatchesar Ionkov result = PTR_ERR(inode); 681bd238fb4SLatchesar Ionkov inode = NULL; 682bd238fb4SLatchesar Ionkov goto error; 6832bad8471SEric Van Hensbergen } 6842bad8471SEric Van Hensbergen 685bd238fb4SLatchesar Ionkov result = v9fs_fid_add(dentry, fid); 6866a3124a3SLatchesar Ionkov if (result < 0) 687bd238fb4SLatchesar Ionkov goto error; 6886a3124a3SLatchesar Ionkov 689e03abc0cSEric Van Hensbergen if ((fid->qid.version) && (v9ses->cache)) 690e03abc0cSEric Van Hensbergen dentry->d_op = &v9fs_cached_dentry_operations; 691e03abc0cSEric Van Hensbergen else 692e03abc0cSEric Van Hensbergen dentry->d_op = &v9fs_dentry_operations; 6932bad8471SEric Van Hensbergen 6942bad8471SEric Van Hensbergen d_add(dentry, inode); 6952bad8471SEric Van Hensbergen return NULL; 6962bad8471SEric Van Hensbergen 697bd238fb4SLatchesar Ionkov error: 698bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 699da977b2cSEric Van Hensbergen 7002bad8471SEric Van Hensbergen return ERR_PTR(result); 7012bad8471SEric Van Hensbergen } 7022bad8471SEric Van Hensbergen 7032bad8471SEric Van Hensbergen /** 7042bad8471SEric Van Hensbergen * v9fs_vfs_unlink - VFS unlink hook to delete an inode 7052bad8471SEric Van Hensbergen * @i: inode that is being unlinked 70673c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7072bad8471SEric Van Hensbergen * 7082bad8471SEric Van Hensbergen */ 7092bad8471SEric Van Hensbergen 7102bad8471SEric Van Hensbergen static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 7112bad8471SEric Van Hensbergen { 7122bad8471SEric Van Hensbergen return v9fs_remove(i, d, 0); 7132bad8471SEric Van Hensbergen } 7142bad8471SEric Van Hensbergen 7152bad8471SEric Van Hensbergen /** 7162bad8471SEric Van Hensbergen * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 7172bad8471SEric Van Hensbergen * @i: inode that is being unlinked 71873c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7192bad8471SEric Van Hensbergen * 7202bad8471SEric Van Hensbergen */ 7212bad8471SEric Van Hensbergen 7222bad8471SEric Van Hensbergen static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 7232bad8471SEric Van Hensbergen { 7242bad8471SEric Van Hensbergen return v9fs_remove(i, d, 1); 7252bad8471SEric Van Hensbergen } 7262bad8471SEric Van Hensbergen 7272bad8471SEric Van Hensbergen /** 7282bad8471SEric Van Hensbergen * v9fs_vfs_rename - VFS hook to rename an inode 7292bad8471SEric Van Hensbergen * @old_dir: old dir inode 7302bad8471SEric Van Hensbergen * @old_dentry: old dentry 7312bad8471SEric Van Hensbergen * @new_dir: new dir inode 7322bad8471SEric Van Hensbergen * @new_dentry: new dentry 7332bad8471SEric Van Hensbergen * 7342bad8471SEric Van Hensbergen */ 7352bad8471SEric Van Hensbergen 7362bad8471SEric Van Hensbergen static int 7372bad8471SEric Van Hensbergen v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 7382bad8471SEric Van Hensbergen struct inode *new_dir, struct dentry *new_dentry) 7392bad8471SEric Van Hensbergen { 740bd238fb4SLatchesar Ionkov struct inode *old_inode; 741bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 742bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 743bd238fb4SLatchesar Ionkov struct p9_fid *olddirfid; 744bd238fb4SLatchesar Ionkov struct p9_fid *newdirfid; 745bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 746bd238fb4SLatchesar Ionkov int retval; 7472bad8471SEric Van Hensbergen 748bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 749bd238fb4SLatchesar Ionkov retval = 0; 750bd238fb4SLatchesar Ionkov old_inode = old_dentry->d_inode; 751bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(old_inode); 752bd238fb4SLatchesar Ionkov oldfid = v9fs_fid_lookup(old_dentry); 753da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 754da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 755da977b2cSEric Van Hensbergen 756da977b2cSEric Van Hensbergen olddirfid = v9fs_fid_clone(old_dentry->d_parent); 757da977b2cSEric Van Hensbergen if (IS_ERR(olddirfid)) { 758da977b2cSEric Van Hensbergen retval = PTR_ERR(olddirfid); 759bd238fb4SLatchesar Ionkov goto done; 760da977b2cSEric Van Hensbergen } 761da977b2cSEric Van Hensbergen 762da977b2cSEric Van Hensbergen newdirfid = v9fs_fid_clone(new_dentry->d_parent); 763da977b2cSEric Van Hensbergen if (IS_ERR(newdirfid)) { 764da977b2cSEric Van Hensbergen retval = PTR_ERR(newdirfid); 765bd238fb4SLatchesar Ionkov goto clunk_olddir; 7662bad8471SEric Van Hensbergen } 7672bad8471SEric Van Hensbergen 7682bad8471SEric Van Hensbergen /* 9P can only handle file rename in the same directory */ 7692bad8471SEric Van Hensbergen if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { 770bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 771bd238fb4SLatchesar Ionkov "old dir and new dir are different\n"); 772621997cdSEric Van Hensbergen retval = -EXDEV; 773bd238fb4SLatchesar Ionkov goto clunk_newdir; 7742bad8471SEric Van Hensbergen } 7752bad8471SEric Van Hensbergen 776531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 777ba17674fSLatchesar Ionkov wstat.muid = v9ses->uname; 778531b1094SLatchesar Ionkov wstat.name = (char *) new_dentry->d_name.name; 779bd238fb4SLatchesar Ionkov retval = p9_client_wstat(oldfid, &wstat); 7802bad8471SEric Van Hensbergen 781bd238fb4SLatchesar Ionkov clunk_newdir: 78222150c4fSLatchesar Ionkov p9_client_clunk(newdirfid); 7832bad8471SEric Van Hensbergen 784bd238fb4SLatchesar Ionkov clunk_olddir: 78522150c4fSLatchesar Ionkov p9_client_clunk(olddirfid); 7862bad8471SEric Van Hensbergen 787bd238fb4SLatchesar Ionkov done: 7882bad8471SEric Van Hensbergen return retval; 7892bad8471SEric Van Hensbergen } 7902bad8471SEric Van Hensbergen 7912bad8471SEric Van Hensbergen /** 792943ffb58SAdrian Bunk * v9fs_vfs_getattr - retrieve file metadata 793ee443996SEric Van Hensbergen * @mnt: mount information 794ee443996SEric Van Hensbergen * @dentry: file to get attributes on 795ee443996SEric Van Hensbergen * @stat: metadata structure to populate 7962bad8471SEric Van Hensbergen * 7972bad8471SEric Van Hensbergen */ 7982bad8471SEric Van Hensbergen 7992bad8471SEric Van Hensbergen static int 8002bad8471SEric Van Hensbergen v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 8012bad8471SEric Van Hensbergen struct kstat *stat) 8022bad8471SEric Van Hensbergen { 803bd238fb4SLatchesar Ionkov int err; 804bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 805bd238fb4SLatchesar Ionkov struct p9_fid *fid; 80651a87c55SEric Van Hensbergen struct p9_wstat *st; 8072bad8471SEric Van Hensbergen 808bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); 809bd238fb4SLatchesar Ionkov err = -EPERM; 810bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 81160e78d2cSAbhishek Kulkarni if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 8129523a841SEric Van Hensbergen return simple_getattr(mnt, dentry, stat); 8139523a841SEric Van Hensbergen 814bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 815da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 816da977b2cSEric Van Hensbergen return PTR_ERR(fid); 8172bad8471SEric Van Hensbergen 818bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 819bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 820bd238fb4SLatchesar Ionkov return PTR_ERR(st); 8212bad8471SEric Van Hensbergen 822bd238fb4SLatchesar Ionkov v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 8232bad8471SEric Van Hensbergen generic_fillattr(dentry->d_inode, stat); 8242bad8471SEric Van Hensbergen 825bd238fb4SLatchesar Ionkov kfree(st); 826bd238fb4SLatchesar Ionkov return 0; 8272bad8471SEric Van Hensbergen } 8282bad8471SEric Van Hensbergen 8292bad8471SEric Van Hensbergen /** 8302bad8471SEric Van Hensbergen * v9fs_vfs_setattr - set file metadata 8312bad8471SEric Van Hensbergen * @dentry: file whose metadata to set 8322bad8471SEric Van Hensbergen * @iattr: metadata assignment structure 8332bad8471SEric Van Hensbergen * 8342bad8471SEric Van Hensbergen */ 8352bad8471SEric Van Hensbergen 8362bad8471SEric Van Hensbergen static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 8372bad8471SEric Van Hensbergen { 838bd238fb4SLatchesar Ionkov int retval; 839bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 840bd238fb4SLatchesar Ionkov struct p9_fid *fid; 841bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 8422bad8471SEric Van Hensbergen 843bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 844bd238fb4SLatchesar Ionkov retval = -EPERM; 845bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 846bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 847da977b2cSEric Van Hensbergen if(IS_ERR(fid)) 848da977b2cSEric Van Hensbergen return PTR_ERR(fid); 8492bad8471SEric Van Hensbergen 850531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 8512bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MODE) 852531b1094SLatchesar Ionkov wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 8532bad8471SEric Van Hensbergen 8542bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MTIME) 855531b1094SLatchesar Ionkov wstat.mtime = iattr->ia_mtime.tv_sec; 8562bad8471SEric Van Hensbergen 8572bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_ATIME) 858531b1094SLatchesar Ionkov wstat.atime = iattr->ia_atime.tv_sec; 8592bad8471SEric Van Hensbergen 8602bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_SIZE) 861531b1094SLatchesar Ionkov wstat.length = iattr->ia_size; 8622bad8471SEric Van Hensbergen 863dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 864531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_UID) 865531b1094SLatchesar Ionkov wstat.n_uid = iattr->ia_uid; 8662bad8471SEric Van Hensbergen 867531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_GID) 868531b1094SLatchesar Ionkov wstat.n_gid = iattr->ia_gid; 8692bad8471SEric Van Hensbergen } 8702bad8471SEric Van Hensbergen 871bd238fb4SLatchesar Ionkov retval = p9_client_wstat(fid, &wstat); 872bd238fb4SLatchesar Ionkov if (retval >= 0) 873bd238fb4SLatchesar Ionkov retval = inode_setattr(dentry->d_inode, iattr); 8742bad8471SEric Van Hensbergen 875bd238fb4SLatchesar Ionkov return retval; 8762bad8471SEric Van Hensbergen } 8772bad8471SEric Van Hensbergen 8782bad8471SEric Van Hensbergen /** 879531b1094SLatchesar Ionkov * v9fs_stat2inode - populate an inode structure with mistat info 880531b1094SLatchesar Ionkov * @stat: Plan 9 metadata (mistat) structure 8812bad8471SEric Van Hensbergen * @inode: inode to populate 8822bad8471SEric Van Hensbergen * @sb: superblock of filesystem 8832bad8471SEric Van Hensbergen * 8842bad8471SEric Van Hensbergen */ 8852bad8471SEric Van Hensbergen 8862bad8471SEric Van Hensbergen void 88751a87c55SEric Van Hensbergen v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 8882bad8471SEric Van Hensbergen struct super_block *sb) 8892bad8471SEric Van Hensbergen { 890531b1094SLatchesar Ionkov char ext[32]; 8915717144aSAneesh Kumar K.V char tag_name[14]; 8925717144aSAneesh Kumar K.V unsigned int i_nlink; 8932bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 8942bad8471SEric Van Hensbergen 8952bad8471SEric Van Hensbergen inode->i_nlink = 1; 8962bad8471SEric Van Hensbergen 897531b1094SLatchesar Ionkov inode->i_atime.tv_sec = stat->atime; 898531b1094SLatchesar Ionkov inode->i_mtime.tv_sec = stat->mtime; 899531b1094SLatchesar Ionkov inode->i_ctime.tv_sec = stat->mtime; 9002bad8471SEric Van Hensbergen 901bd32b82dSLatchesar Ionkov inode->i_uid = v9ses->dfltuid; 902bd32b82dSLatchesar Ionkov inode->i_gid = v9ses->dfltgid; 9032bad8471SEric Van Hensbergen 904dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 905531b1094SLatchesar Ionkov inode->i_uid = stat->n_uid; 906531b1094SLatchesar Ionkov inode->i_gid = stat->n_gid; 907531b1094SLatchesar Ionkov } 9085717144aSAneesh Kumar K.V if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 9095717144aSAneesh Kumar K.V if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 9105717144aSAneesh Kumar K.V /* 9115717144aSAneesh Kumar K.V * Hadlink support got added later to 9125717144aSAneesh Kumar K.V * to the .u extension. So there can be 9135717144aSAneesh Kumar K.V * server out there that doesn't support 9145717144aSAneesh Kumar K.V * this even with .u extension. So check 9155717144aSAneesh Kumar K.V * for non NULL stat->extension 9165717144aSAneesh Kumar K.V */ 9175717144aSAneesh Kumar K.V strncpy(ext, stat->extension, sizeof(ext)); 9185717144aSAneesh Kumar K.V /* HARDLINKCOUNT %u */ 9195717144aSAneesh Kumar K.V sscanf(ext, "%13s %u", tag_name, &i_nlink); 9205717144aSAneesh Kumar K.V if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 9215717144aSAneesh Kumar K.V inode->i_nlink = i_nlink; 9225717144aSAneesh Kumar K.V } 9235717144aSAneesh Kumar K.V } 924531b1094SLatchesar Ionkov inode->i_mode = p9mode2unixmode(v9ses, stat->mode); 9252bad8471SEric Van Hensbergen if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 9262bad8471SEric Van Hensbergen char type = 0; 9272bad8471SEric Van Hensbergen int major = -1; 9282bad8471SEric Van Hensbergen int minor = -1; 929531b1094SLatchesar Ionkov 93051a87c55SEric Van Hensbergen strncpy(ext, stat->extension, sizeof(ext)); 931531b1094SLatchesar Ionkov sscanf(ext, "%c %u %u", &type, &major, &minor); 9322bad8471SEric Van Hensbergen switch (type) { 9332bad8471SEric Van Hensbergen case 'c': 9342bad8471SEric Van Hensbergen inode->i_mode &= ~S_IFBLK; 9352bad8471SEric Van Hensbergen inode->i_mode |= S_IFCHR; 9362bad8471SEric Van Hensbergen break; 9372bad8471SEric Van Hensbergen case 'b': 9382bad8471SEric Van Hensbergen break; 9392bad8471SEric Van Hensbergen default: 940bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 94151a87c55SEric Van Hensbergen "Unknown special type %c %s\n", type, 94251a87c55SEric Van Hensbergen stat->extension); 9432bad8471SEric Van Hensbergen }; 9442bad8471SEric Van Hensbergen inode->i_rdev = MKDEV(major, minor); 94557c7b4e6SMagnus Deininger init_special_inode(inode, inode->i_mode, inode->i_rdev); 9462bad8471SEric Van Hensbergen } else 9472bad8471SEric Van Hensbergen inode->i_rdev = 0; 9482bad8471SEric Van Hensbergen 9497549ae3eSAbhishek Kulkarni i_size_write(inode, stat->length); 9502bad8471SEric Van Hensbergen 951bd238fb4SLatchesar Ionkov /* not real number of blocks, but 512 byte ones ... */ 9527549ae3eSAbhishek Kulkarni inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 9532bad8471SEric Van Hensbergen } 9542bad8471SEric Van Hensbergen 9552bad8471SEric Van Hensbergen /** 9562bad8471SEric Van Hensbergen * v9fs_qid2ino - convert qid into inode number 9572bad8471SEric Van Hensbergen * @qid: qid to hash 9582bad8471SEric Van Hensbergen * 9592bad8471SEric Van Hensbergen * BUG: potential for inode number collisions? 9602bad8471SEric Van Hensbergen */ 9612bad8471SEric Van Hensbergen 962bd238fb4SLatchesar Ionkov ino_t v9fs_qid2ino(struct p9_qid *qid) 9632bad8471SEric Van Hensbergen { 9642bad8471SEric Van Hensbergen u64 path = qid->path + 2; 9652bad8471SEric Van Hensbergen ino_t i = 0; 9662bad8471SEric Van Hensbergen 9672bad8471SEric Van Hensbergen if (sizeof(ino_t) == sizeof(path)) 9682bad8471SEric Van Hensbergen memcpy(&i, &path, sizeof(ino_t)); 9692bad8471SEric Van Hensbergen else 9702bad8471SEric Van Hensbergen i = (ino_t) (path ^ (path >> 32)); 9712bad8471SEric Van Hensbergen 9722bad8471SEric Van Hensbergen return i; 9732bad8471SEric Van Hensbergen } 9742bad8471SEric Van Hensbergen 9752bad8471SEric Van Hensbergen /** 9762bad8471SEric Van Hensbergen * v9fs_readlink - read a symlink's location (internal version) 9772bad8471SEric Van Hensbergen * @dentry: dentry for symlink 97873c592b9SEric Van Hensbergen * @buffer: buffer to load symlink location into 9792bad8471SEric Van Hensbergen * @buflen: length of buffer 9802bad8471SEric Van Hensbergen * 9812bad8471SEric Van Hensbergen */ 9822bad8471SEric Van Hensbergen 9832bad8471SEric Van Hensbergen static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 9842bad8471SEric Van Hensbergen { 985bd238fb4SLatchesar Ionkov int retval; 9862bad8471SEric Van Hensbergen 987bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 988bd238fb4SLatchesar Ionkov struct p9_fid *fid; 98951a87c55SEric Van Hensbergen struct p9_wstat *st; 9902bad8471SEric Van Hensbergen 991bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 992bd238fb4SLatchesar Ionkov retval = -EPERM; 993bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 994bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 995da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 996da977b2cSEric Van Hensbergen return PTR_ERR(fid); 9972bad8471SEric Van Hensbergen 998dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) 999bd238fb4SLatchesar Ionkov return -EBADF; 10002bad8471SEric Van Hensbergen 1001bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 1002bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 1003bd238fb4SLatchesar Ionkov return PTR_ERR(st); 10042bad8471SEric Van Hensbergen 1005bd238fb4SLatchesar Ionkov if (!(st->mode & P9_DMSYMLINK)) { 10062bad8471SEric Van Hensbergen retval = -EINVAL; 1007bd238fb4SLatchesar Ionkov goto done; 10082bad8471SEric Van Hensbergen } 10092bad8471SEric Van Hensbergen 10102bad8471SEric Van Hensbergen /* copy extension buffer into buffer */ 101151a87c55SEric Van Hensbergen strncpy(buffer, st->extension, buflen); 10122bad8471SEric Van Hensbergen 1013bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 101451a87c55SEric Van Hensbergen "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); 1015bd238fb4SLatchesar Ionkov 10162511cd0bSMartin Stava retval = strnlen(buffer, buflen); 1017bd238fb4SLatchesar Ionkov done: 1018bd238fb4SLatchesar Ionkov kfree(st); 10192bad8471SEric Van Hensbergen return retval; 10202bad8471SEric Van Hensbergen } 10212bad8471SEric Van Hensbergen 10222bad8471SEric Van Hensbergen /** 10232bad8471SEric Van Hensbergen * v9fs_vfs_follow_link - follow a symlink path 10242bad8471SEric Van Hensbergen * @dentry: dentry for symlink 10252bad8471SEric Van Hensbergen * @nd: nameidata 10262bad8471SEric Van Hensbergen * 10272bad8471SEric Van Hensbergen */ 10282bad8471SEric Van Hensbergen 10292bad8471SEric Van Hensbergen static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 10302bad8471SEric Van Hensbergen { 10312bad8471SEric Van Hensbergen int len = 0; 10322bad8471SEric Van Hensbergen char *link = __getname(); 10332bad8471SEric Van Hensbergen 1034bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); 10352bad8471SEric Van Hensbergen 10362bad8471SEric Van Hensbergen if (!link) 10372bad8471SEric Van Hensbergen link = ERR_PTR(-ENOMEM); 10382bad8471SEric Van Hensbergen else { 103916cce6d2SLatchesar Ionkov len = v9fs_readlink(dentry, link, PATH_MAX); 10402bad8471SEric Van Hensbergen 10412bad8471SEric Van Hensbergen if (len < 0) { 1042ce44eeb6SDavi Arnaut __putname(link); 10432bad8471SEric Van Hensbergen link = ERR_PTR(len); 10442bad8471SEric Van Hensbergen } else 10452511cd0bSMartin Stava link[min(len, PATH_MAX-1)] = 0; 10462bad8471SEric Van Hensbergen } 10472bad8471SEric Van Hensbergen nd_set_link(nd, link); 10482bad8471SEric Van Hensbergen 10492bad8471SEric Van Hensbergen return NULL; 10502bad8471SEric Van Hensbergen } 10512bad8471SEric Van Hensbergen 10522bad8471SEric Van Hensbergen /** 10532bad8471SEric Van Hensbergen * v9fs_vfs_put_link - release a symlink path 10542bad8471SEric Van Hensbergen * @dentry: dentry for symlink 10552bad8471SEric Van Hensbergen * @nd: nameidata 1056ee443996SEric Van Hensbergen * @p: unused 10572bad8471SEric Van Hensbergen * 10582bad8471SEric Van Hensbergen */ 10592bad8471SEric Van Hensbergen 1060ee443996SEric Van Hensbergen static void 1061ee443996SEric Van Hensbergen v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 10622bad8471SEric Van Hensbergen { 10632bad8471SEric Van Hensbergen char *s = nd_get_link(nd); 10642bad8471SEric Van Hensbergen 10656ff23207SDuane Griffin P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, 10666ff23207SDuane Griffin IS_ERR(s) ? "<error>" : s); 10672bad8471SEric Van Hensbergen if (!IS_ERR(s)) 1068ce44eeb6SDavi Arnaut __putname(s); 10692bad8471SEric Van Hensbergen } 10702bad8471SEric Van Hensbergen 1071ee443996SEric Van Hensbergen /** 1072ee443996SEric Van Hensbergen * v9fs_vfs_mkspecial - create a special file 1073ee443996SEric Van Hensbergen * @dir: inode to create special file in 1074ee443996SEric Van Hensbergen * @dentry: dentry to create 1075ee443996SEric Van Hensbergen * @mode: mode to create special file 1076ee443996SEric Van Hensbergen * @extension: 9p2000.u format extension string representing special file 1077ee443996SEric Van Hensbergen * 1078ee443996SEric Van Hensbergen */ 1079ee443996SEric Van Hensbergen 1080531b1094SLatchesar Ionkov static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1081531b1094SLatchesar Ionkov int mode, const char *extension) 1082531b1094SLatchesar Ionkov { 1083bd238fb4SLatchesar Ionkov u32 perm; 1084531b1094SLatchesar Ionkov struct v9fs_session_info *v9ses; 1085bd238fb4SLatchesar Ionkov struct p9_fid *fid; 1086531b1094SLatchesar Ionkov 10876a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 1088dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) { 1089bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); 10906a3124a3SLatchesar Ionkov return -EPERM; 1091531b1094SLatchesar Ionkov } 1092531b1094SLatchesar Ionkov 1093da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 1094bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1095bd238fb4SLatchesar Ionkov P9_OREAD); 1096bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) 1097bd238fb4SLatchesar Ionkov return PTR_ERR(fid); 1098da977b2cSEric Van Hensbergen 1099bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 11006a3124a3SLatchesar Ionkov return 0; 1101531b1094SLatchesar Ionkov } 1102531b1094SLatchesar Ionkov 1103531b1094SLatchesar Ionkov /** 1104531b1094SLatchesar Ionkov * v9fs_vfs_symlink - helper function to create symlinks 1105531b1094SLatchesar Ionkov * @dir: directory inode containing symlink 1106531b1094SLatchesar Ionkov * @dentry: dentry for symlink 1107531b1094SLatchesar Ionkov * @symname: symlink data 1108531b1094SLatchesar Ionkov * 1109ee443996SEric Van Hensbergen * See Also: 9P2000.u RFC for more information 1110531b1094SLatchesar Ionkov * 1111531b1094SLatchesar Ionkov */ 1112531b1094SLatchesar Ionkov 1113531b1094SLatchesar Ionkov static int 1114531b1094SLatchesar Ionkov v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1115531b1094SLatchesar Ionkov { 1116bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, 1117bd238fb4SLatchesar Ionkov dentry->d_name.name, symname); 1118531b1094SLatchesar Ionkov 1119531b1094SLatchesar Ionkov return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1120531b1094SLatchesar Ionkov } 1121531b1094SLatchesar Ionkov 11222bad8471SEric Van Hensbergen /** 11232bad8471SEric Van Hensbergen * v9fs_vfs_link - create a hardlink 11242bad8471SEric Van Hensbergen * @old_dentry: dentry for file to link to 11252bad8471SEric Van Hensbergen * @dir: inode destination for new link 112673c592b9SEric Van Hensbergen * @dentry: dentry for link 11272bad8471SEric Van Hensbergen * 11282bad8471SEric Van Hensbergen */ 11292bad8471SEric Van Hensbergen 11302bad8471SEric Van Hensbergen static int 11312bad8471SEric Van Hensbergen v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 11322bad8471SEric Van Hensbergen struct dentry *dentry) 11332bad8471SEric Van Hensbergen { 1134531b1094SLatchesar Ionkov int retval; 1135bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 1136531b1094SLatchesar Ionkov char *name; 11372bad8471SEric Van Hensbergen 1138bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1139bd238fb4SLatchesar Ionkov " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 11402bad8471SEric Van Hensbergen old_dentry->d_name.name); 11412bad8471SEric Van Hensbergen 1142da977b2cSEric Van Hensbergen oldfid = v9fs_fid_clone(old_dentry); 1143da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 1144da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 11452bad8471SEric Van Hensbergen 1146531b1094SLatchesar Ionkov name = __getname(); 1147da977b2cSEric Van Hensbergen if (unlikely(!name)) { 1148da977b2cSEric Van Hensbergen retval = -ENOMEM; 1149da977b2cSEric Van Hensbergen goto clunk_fid; 1150da977b2cSEric Van Hensbergen } 11510710d36aSFlorin Malita 115216cce6d2SLatchesar Ionkov sprintf(name, "%d\n", oldfid->fid); 1153bd238fb4SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1154531b1094SLatchesar Ionkov __putname(name); 11552bad8471SEric Van Hensbergen 1156da977b2cSEric Van Hensbergen clunk_fid: 1157bd238fb4SLatchesar Ionkov p9_client_clunk(oldfid); 11582bad8471SEric Van Hensbergen return retval; 11592bad8471SEric Van Hensbergen } 11602bad8471SEric Van Hensbergen 11612bad8471SEric Van Hensbergen /** 11622bad8471SEric Van Hensbergen * v9fs_vfs_mknod - create a special file 11632bad8471SEric Van Hensbergen * @dir: inode destination for new link 11642bad8471SEric Van Hensbergen * @dentry: dentry for file 11652bad8471SEric Van Hensbergen * @mode: mode for creation 1166ee443996SEric Van Hensbergen * @rdev: device associated with special file 11672bad8471SEric Van Hensbergen * 11682bad8471SEric Van Hensbergen */ 11692bad8471SEric Van Hensbergen 11702bad8471SEric Van Hensbergen static int 11712bad8471SEric Van Hensbergen v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 11722bad8471SEric Van Hensbergen { 1173531b1094SLatchesar Ionkov int retval; 1174531b1094SLatchesar Ionkov char *name; 11752bad8471SEric Van Hensbergen 1176bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1177bd238fb4SLatchesar Ionkov " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 11782bad8471SEric Van Hensbergen dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 11792bad8471SEric Van Hensbergen 1180531b1094SLatchesar Ionkov if (!new_valid_dev(rdev)) 1181531b1094SLatchesar Ionkov return -EINVAL; 118273c592b9SEric Van Hensbergen 1183531b1094SLatchesar Ionkov name = __getname(); 1184c0291a05SEugene Teo if (!name) 1185c0291a05SEugene Teo return -ENOMEM; 11862bad8471SEric Van Hensbergen /* build extension */ 11872bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 1188531b1094SLatchesar Ionkov sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 11892bad8471SEric Van Hensbergen else if (S_ISCHR(mode)) 1190531b1094SLatchesar Ionkov sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 119173c592b9SEric Van Hensbergen else if (S_ISFIFO(mode)) 1192531b1094SLatchesar Ionkov *name = 0; 11932bad8471SEric Van Hensbergen else { 1194531b1094SLatchesar Ionkov __putname(name); 1195531b1094SLatchesar Ionkov return -EINVAL; 11962bad8471SEric Van Hensbergen } 11972bad8471SEric Van Hensbergen 1198531b1094SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1199531b1094SLatchesar Ionkov __putname(name); 12002bad8471SEric Van Hensbergen 12012bad8471SEric Van Hensbergen return retval; 12022bad8471SEric Van Hensbergen } 12032bad8471SEric Van Hensbergen 1204754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations_ext = { 12052bad8471SEric Van Hensbergen .create = v9fs_vfs_create, 12062bad8471SEric Van Hensbergen .lookup = v9fs_vfs_lookup, 12072bad8471SEric Van Hensbergen .symlink = v9fs_vfs_symlink, 12082bad8471SEric Van Hensbergen .link = v9fs_vfs_link, 12092bad8471SEric Van Hensbergen .unlink = v9fs_vfs_unlink, 12102bad8471SEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 12112bad8471SEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 12122bad8471SEric Van Hensbergen .mknod = v9fs_vfs_mknod, 12132bad8471SEric Van Hensbergen .rename = v9fs_vfs_rename, 12142bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 12152bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 12162bad8471SEric Van Hensbergen }; 12172bad8471SEric Van Hensbergen 1218754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations = { 1219b501611aSEric Van Hensbergen .create = v9fs_vfs_create, 1220b501611aSEric Van Hensbergen .lookup = v9fs_vfs_lookup, 1221b501611aSEric Van Hensbergen .unlink = v9fs_vfs_unlink, 1222b501611aSEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 1223b501611aSEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 1224b501611aSEric Van Hensbergen .mknod = v9fs_vfs_mknod, 1225b501611aSEric Van Hensbergen .rename = v9fs_vfs_rename, 1226b501611aSEric Van Hensbergen .getattr = v9fs_vfs_getattr, 1227b501611aSEric Van Hensbergen .setattr = v9fs_vfs_setattr, 1228b501611aSEric Van Hensbergen }; 1229b501611aSEric Van Hensbergen 1230754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations = { 12312bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 12322bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 12332bad8471SEric Van Hensbergen }; 12342bad8471SEric Van Hensbergen 1235754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations = { 1236204f2f0eSAl Viro .readlink = generic_readlink, 12372bad8471SEric Van Hensbergen .follow_link = v9fs_vfs_follow_link, 12382bad8471SEric Van Hensbergen .put_link = v9fs_vfs_put_link, 12392bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 12402bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 12412bad8471SEric Van Hensbergen }; 1242