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 259217f206dSDmitry Monakhov inode_init_owner(inode, NULL, mode); 2602bad8471SEric Van Hensbergen inode->i_blocks = 0; 2612bad8471SEric Van Hensbergen inode->i_rdev = 0; 2622bad8471SEric Van Hensbergen inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 263147b31cfSEric Van Hensbergen inode->i_mapping->a_ops = &v9fs_addr_operations; 2642bad8471SEric Van Hensbergen 2652bad8471SEric Van Hensbergen switch (mode & S_IFMT) { 2662bad8471SEric Van Hensbergen case S_IFIFO: 2672bad8471SEric Van Hensbergen case S_IFBLK: 2682bad8471SEric Van Hensbergen case S_IFCHR: 2692bad8471SEric Van Hensbergen case S_IFSOCK: 270dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) { 271bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 272bd238fb4SLatchesar Ionkov "special files without extended mode\n"); 2732bb54115SAbhishek Kulkarni err = -EINVAL; 2742bb54115SAbhishek Kulkarni goto error; 275b501611aSEric Van Hensbergen } 2762bb54115SAbhishek Kulkarni init_special_inode(inode, inode->i_mode, inode->i_rdev); 2775d58bec5SEric Van Hensbergen break; 2782bad8471SEric Van Hensbergen case S_IFREG: 2799b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 2809b6533c9SSripathi Kodi inode->i_op = &v9fs_file_inode_operations_dotl; 2819b6533c9SSripathi Kodi inode->i_fop = &v9fs_file_operations_dotl; 2829b6533c9SSripathi Kodi } else { 2832bad8471SEric Van Hensbergen inode->i_op = &v9fs_file_inode_operations; 2842bad8471SEric Van Hensbergen inode->i_fop = &v9fs_file_operations; 2859b6533c9SSripathi Kodi } 2869b6533c9SSripathi Kodi 2872bad8471SEric Van Hensbergen break; 2889b6533c9SSripathi Kodi 289b501611aSEric Van Hensbergen case S_IFLNK: 2909b6533c9SSripathi Kodi if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 2919b6533c9SSripathi Kodi P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " 2929b6533c9SSripathi Kodi "legacy protocol.\n"); 2932bb54115SAbhishek Kulkarni err = -EINVAL; 2942bb54115SAbhishek Kulkarni goto error; 295b501611aSEric Van Hensbergen } 2969b6533c9SSripathi Kodi 2979b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 2989b6533c9SSripathi Kodi inode->i_op = &v9fs_symlink_inode_operations_dotl; 2999b6533c9SSripathi Kodi else 300b501611aSEric Van Hensbergen inode->i_op = &v9fs_symlink_inode_operations; 3019b6533c9SSripathi Kodi 302b501611aSEric Van Hensbergen break; 3032bad8471SEric Van Hensbergen case S_IFDIR: 304d8c76e6fSDave Hansen inc_nlink(inode); 3059b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3069b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotl; 3079b6533c9SSripathi Kodi else if (v9fs_proto_dotu(v9ses)) 3089b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotu; 309b501611aSEric Van Hensbergen else 3102bad8471SEric Van Hensbergen inode->i_op = &v9fs_dir_inode_operations; 3119b6533c9SSripathi Kodi 3129b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3139b6533c9SSripathi Kodi inode->i_fop = &v9fs_dir_operations_dotl; 3149b6533c9SSripathi Kodi else 3152bad8471SEric Van Hensbergen inode->i_fop = &v9fs_dir_operations; 3169b6533c9SSripathi Kodi 3172bad8471SEric Van Hensbergen break; 3182bad8471SEric Van Hensbergen default: 3192bb54115SAbhishek Kulkarni P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 3202bad8471SEric Van Hensbergen mode, mode & S_IFMT); 3212bb54115SAbhishek Kulkarni err = -EINVAL; 3222bb54115SAbhishek Kulkarni goto error; 3232bad8471SEric Van Hensbergen } 3242bb54115SAbhishek Kulkarni 3252bad8471SEric Van Hensbergen return inode; 3262bb54115SAbhishek Kulkarni 3272bb54115SAbhishek Kulkarni error: 3282bb54115SAbhishek Kulkarni iput(inode); 3292bb54115SAbhishek Kulkarni return ERR_PTR(err); 3302bad8471SEric Van Hensbergen } 3312bad8471SEric Van Hensbergen 332bd238fb4SLatchesar Ionkov /* 3336a3124a3SLatchesar Ionkov static struct v9fs_fid* 3346a3124a3SLatchesar Ionkov v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 3356a3124a3SLatchesar Ionkov { 3366a3124a3SLatchesar Ionkov int err; 337736c4b85SMika Kukkonen int nfid; 3386a3124a3SLatchesar Ionkov struct v9fs_fid *ret; 3396a3124a3SLatchesar Ionkov struct v9fs_fcall *fcall; 3400b8dd177SLatchesar Ionkov 3416a3124a3SLatchesar Ionkov nfid = v9fs_get_idpool(&v9ses->fidpool); 3426a3124a3SLatchesar Ionkov if (nfid < 0) { 3430b8dd177SLatchesar Ionkov eprintk(KERN_WARNING, "no free fids available\n"); 344731805b4SLatchesar Ionkov return ERR_PTR(-ENOSPC); 3450b8dd177SLatchesar Ionkov } 3460b8dd177SLatchesar Ionkov 3476a3124a3SLatchesar Ionkov err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 3486a3124a3SLatchesar Ionkov &fcall); 3496a3124a3SLatchesar Ionkov 3506a3124a3SLatchesar Ionkov if (err < 0) { 35141e5a6acSLatchesar Ionkov if (fcall && fcall->id == RWALK) 35241e5a6acSLatchesar Ionkov goto clunk_fid; 35341e5a6acSLatchesar Ionkov 3546a3124a3SLatchesar Ionkov PRINT_FCALL_ERROR("walk error", fcall); 3556a3124a3SLatchesar Ionkov v9fs_put_idpool(nfid, &v9ses->fidpool); 3566a3124a3SLatchesar Ionkov goto error; 3570b8dd177SLatchesar Ionkov } 3586a3124a3SLatchesar Ionkov 3593cf6429aSLatchesar Ionkov kfree(fcall); 3603cf6429aSLatchesar Ionkov fcall = NULL; 3616a3124a3SLatchesar Ionkov ret = v9fs_fid_create(v9ses, nfid); 3626a3124a3SLatchesar Ionkov if (!ret) { 3636a3124a3SLatchesar Ionkov err = -ENOMEM; 3646a3124a3SLatchesar Ionkov goto clunk_fid; 3650b8dd177SLatchesar Ionkov } 3662bad8471SEric Van Hensbergen 3676a3124a3SLatchesar Ionkov err = v9fs_fid_insert(ret, dentry); 3686a3124a3SLatchesar Ionkov if (err < 0) { 3696a3124a3SLatchesar Ionkov v9fs_fid_destroy(ret); 3706a3124a3SLatchesar Ionkov goto clunk_fid; 3716a3124a3SLatchesar Ionkov } 3722bad8471SEric Van Hensbergen 3736a3124a3SLatchesar Ionkov return ret; 3746a3124a3SLatchesar Ionkov 3756a3124a3SLatchesar Ionkov clunk_fid: 3766a3124a3SLatchesar Ionkov v9fs_t_clunk(v9ses, nfid); 3776a3124a3SLatchesar Ionkov 3786a3124a3SLatchesar Ionkov error: 3796a3124a3SLatchesar Ionkov kfree(fcall); 3806a3124a3SLatchesar Ionkov return ERR_PTR(err); 3816a3124a3SLatchesar Ionkov } 382bd238fb4SLatchesar Ionkov */ 3836a3124a3SLatchesar Ionkov 38460e78d2cSAbhishek Kulkarni 38560e78d2cSAbhishek Kulkarni /** 38660e78d2cSAbhishek Kulkarni * v9fs_clear_inode - release an inode 38760e78d2cSAbhishek Kulkarni * @inode: inode to release 38860e78d2cSAbhishek Kulkarni * 38960e78d2cSAbhishek Kulkarni */ 390b57922d9SAl Viro void v9fs_evict_inode(struct inode *inode) 39160e78d2cSAbhishek Kulkarni { 392b57922d9SAl Viro truncate_inode_pages(inode->i_mapping, 0); 393b57922d9SAl Viro end_writeback(inode); 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 p9_fid *v9fid; 4602bad8471SEric Van Hensbergen 461bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, 4622bad8471SEric Van Hensbergen rmdir); 4632bad8471SEric Van Hensbergen 4642bad8471SEric Van Hensbergen file_inode = file->d_inode; 465c959df9fSLatchesar Ionkov v9fid = v9fs_fid_clone(file); 466da977b2cSEric Van Hensbergen if (IS_ERR(v9fid)) 467da977b2cSEric Van Hensbergen return PTR_ERR(v9fid); 4682bad8471SEric Van Hensbergen 469d994f405SAneesh Kumar K.V retval = p9_client_remove(v9fid); 470d994f405SAneesh Kumar K.V if (!retval) 471d994f405SAneesh Kumar K.V drop_nlink(file_inode); 472d994f405SAneesh Kumar K.V return retval; 4732bad8471SEric Van Hensbergen } 4742bad8471SEric Van Hensbergen 4756a3124a3SLatchesar Ionkov static int 4766a3124a3SLatchesar Ionkov v9fs_open_created(struct inode *inode, struct file *file) 4776a3124a3SLatchesar Ionkov { 4786a3124a3SLatchesar Ionkov return 0; 4796a3124a3SLatchesar Ionkov } 4806a3124a3SLatchesar Ionkov 481bd238fb4SLatchesar Ionkov 482bd238fb4SLatchesar Ionkov /** 483bd238fb4SLatchesar Ionkov * v9fs_create - Create a file 484ee443996SEric Van Hensbergen * @v9ses: session information 485ee443996SEric Van Hensbergen * @dir: directory that dentry is being created in 486bd238fb4SLatchesar Ionkov * @dentry: dentry that is being created 4870e15597eSAbhishek Kulkarni * @extension: 9p2000.u extension string to support devices, etc. 488bd238fb4SLatchesar Ionkov * @perm: create permissions 489bd238fb4SLatchesar Ionkov * @mode: open mode 490bd238fb4SLatchesar Ionkov * 491bd238fb4SLatchesar Ionkov */ 492bd238fb4SLatchesar Ionkov static struct p9_fid * 493bd238fb4SLatchesar Ionkov v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 494bd238fb4SLatchesar Ionkov struct dentry *dentry, char *extension, u32 perm, u8 mode) 495bd238fb4SLatchesar Ionkov { 496bd238fb4SLatchesar Ionkov int err; 497bd238fb4SLatchesar Ionkov char *name; 498bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *ofid, *fid; 499bd238fb4SLatchesar Ionkov struct inode *inode; 500bd238fb4SLatchesar Ionkov 50151a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 50251a87c55SEric Van Hensbergen 503bd238fb4SLatchesar Ionkov err = 0; 504bd238fb4SLatchesar Ionkov ofid = NULL; 505bd238fb4SLatchesar Ionkov fid = NULL; 506bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 5076d27e64dSVenkateswararao Jujjuri dfid = v9fs_fid_lookup(dentry->d_parent); 508bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) { 509bd238fb4SLatchesar Ionkov err = PTR_ERR(dfid); 5106d27e64dSVenkateswararao Jujjuri P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 5116d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 512bd238fb4SLatchesar Ionkov } 513bd238fb4SLatchesar Ionkov 514bd238fb4SLatchesar Ionkov /* clone a fid to use for creation */ 515bd238fb4SLatchesar Ionkov ofid = p9_client_walk(dfid, 0, NULL, 1); 516bd238fb4SLatchesar Ionkov if (IS_ERR(ofid)) { 517bd238fb4SLatchesar Ionkov err = PTR_ERR(ofid); 51851a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 5196d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 520bd238fb4SLatchesar Ionkov } 521bd238fb4SLatchesar Ionkov 522bd238fb4SLatchesar Ionkov err = p9_client_fcreate(ofid, name, perm, mode, extension); 52351a87c55SEric Van Hensbergen if (err < 0) { 52451a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 525bd238fb4SLatchesar Ionkov goto error; 52651a87c55SEric Van Hensbergen } 527bd238fb4SLatchesar Ionkov 528bd238fb4SLatchesar Ionkov /* now walk from the parent so we can get unopened fid */ 5296d27e64dSVenkateswararao Jujjuri fid = p9_client_walk(dfid, 1, &name, 1); 530bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 531bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 53251a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 533bd238fb4SLatchesar Ionkov fid = NULL; 534bd238fb4SLatchesar Ionkov goto error; 5356d27e64dSVenkateswararao Jujjuri } 536bd238fb4SLatchesar Ionkov 537bd238fb4SLatchesar Ionkov /* instantiate inode and assign the unopened fid to the dentry */ 538bd238fb4SLatchesar Ionkov inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 539bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 540bd238fb4SLatchesar Ionkov err = PTR_ERR(inode); 54151a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); 542bd238fb4SLatchesar Ionkov goto error; 543bd238fb4SLatchesar Ionkov } 544bd238fb4SLatchesar Ionkov 545bd238fb4SLatchesar Ionkov if (v9ses->cache) 546bd238fb4SLatchesar Ionkov dentry->d_op = &v9fs_cached_dentry_operations; 547bd238fb4SLatchesar Ionkov else 548bd238fb4SLatchesar Ionkov dentry->d_op = &v9fs_dentry_operations; 549bd238fb4SLatchesar Ionkov 550bd238fb4SLatchesar Ionkov d_instantiate(dentry, inode); 55150fb6d2bSAbhishek Kulkarni err = v9fs_fid_add(dentry, fid); 55250fb6d2bSAbhishek Kulkarni if (err < 0) 55350fb6d2bSAbhishek Kulkarni goto error; 55450fb6d2bSAbhishek Kulkarni 555bd238fb4SLatchesar Ionkov return ofid; 556bd238fb4SLatchesar Ionkov 557bd238fb4SLatchesar Ionkov error: 558bd238fb4SLatchesar Ionkov if (ofid) 559bd238fb4SLatchesar Ionkov p9_client_clunk(ofid); 560bd238fb4SLatchesar Ionkov 561bd238fb4SLatchesar Ionkov if (fid) 562bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 563bd238fb4SLatchesar Ionkov 564bd238fb4SLatchesar Ionkov return ERR_PTR(err); 565bd238fb4SLatchesar Ionkov } 566bd238fb4SLatchesar Ionkov 5672bad8471SEric Van Hensbergen /** 5682bad8471SEric Van Hensbergen * v9fs_vfs_create - VFS hook to create files 569ee443996SEric Van Hensbergen * @dir: directory inode that is being created 5702bad8471SEric Van Hensbergen * @dentry: dentry that is being deleted 5716a3124a3SLatchesar Ionkov * @mode: create permissions 5722bad8471SEric Van Hensbergen * @nd: path information 5732bad8471SEric Van Hensbergen * 5742bad8471SEric Van Hensbergen */ 5752bad8471SEric Van Hensbergen 5762bad8471SEric Van Hensbergen static int 5776a3124a3SLatchesar Ionkov v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 5782bad8471SEric Van Hensbergen struct nameidata *nd) 5792bad8471SEric Van Hensbergen { 5806a3124a3SLatchesar Ionkov int err; 581bd238fb4SLatchesar Ionkov u32 perm; 5826a3124a3SLatchesar Ionkov int flags; 5836a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 584bd238fb4SLatchesar Ionkov struct p9_fid *fid; 5856a3124a3SLatchesar Ionkov struct file *filp; 5866a3124a3SLatchesar Ionkov 587bd238fb4SLatchesar Ionkov err = 0; 588bd238fb4SLatchesar Ionkov fid = NULL; 5896a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 590da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 5916a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) 5926a3124a3SLatchesar Ionkov flags = nd->intent.open.flags - 1; 5936a3124a3SLatchesar Ionkov else 5946a3124a3SLatchesar Ionkov flags = O_RDWR; 5956a3124a3SLatchesar Ionkov 596bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 597dd6102fbSSripathi Kodi v9fs_uflags2omode(flags, 598dd6102fbSSripathi Kodi v9fs_proto_dotu(v9ses))); 599bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 600bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 601bd238fb4SLatchesar Ionkov fid = NULL; 6026a3124a3SLatchesar Ionkov goto error; 6036a3124a3SLatchesar Ionkov } 6046a3124a3SLatchesar Ionkov 605bd238fb4SLatchesar Ionkov /* if we are opening a file, assign the open fid to the file */ 6066a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) { 6076a3124a3SLatchesar Ionkov filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); 6086a3124a3SLatchesar Ionkov if (IS_ERR(filp)) { 609bd238fb4SLatchesar Ionkov err = PTR_ERR(filp); 610bd238fb4SLatchesar Ionkov goto error; 6116a3124a3SLatchesar Ionkov } 6126a3124a3SLatchesar Ionkov 613bd238fb4SLatchesar Ionkov filp->private_data = fid; 614bd238fb4SLatchesar Ionkov } else 615bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6166a3124a3SLatchesar Ionkov 6176a3124a3SLatchesar Ionkov return 0; 6186a3124a3SLatchesar Ionkov 6196a3124a3SLatchesar Ionkov error: 620bd238fb4SLatchesar Ionkov if (fid) 621bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6226a3124a3SLatchesar Ionkov 6236a3124a3SLatchesar Ionkov return err; 6242bad8471SEric Van Hensbergen } 6252bad8471SEric Van Hensbergen 6262bad8471SEric Van Hensbergen /** 6272bad8471SEric Van Hensbergen * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 628ee443996SEric Van Hensbergen * @dir: inode that is being unlinked 6292bad8471SEric Van Hensbergen * @dentry: dentry that is being unlinked 6302bad8471SEric Van Hensbergen * @mode: mode for new directory 6312bad8471SEric Van Hensbergen * 6322bad8471SEric Van Hensbergen */ 6332bad8471SEric Van Hensbergen 6346a3124a3SLatchesar Ionkov static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 6352bad8471SEric Van Hensbergen { 6366a3124a3SLatchesar Ionkov int err; 637bd238fb4SLatchesar Ionkov u32 perm; 6386a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 639bd238fb4SLatchesar Ionkov struct p9_fid *fid; 6406a3124a3SLatchesar Ionkov 641bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 642bd238fb4SLatchesar Ionkov err = 0; 6436a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 6446a3124a3SLatchesar Ionkov perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 645bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 646bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 647bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 648bd238fb4SLatchesar Ionkov fid = NULL; 6496a3124a3SLatchesar Ionkov } 6506a3124a3SLatchesar Ionkov 651bd238fb4SLatchesar Ionkov if (fid) 652bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6536a3124a3SLatchesar Ionkov 6546a3124a3SLatchesar Ionkov return err; 6552bad8471SEric Van Hensbergen } 6562bad8471SEric Van Hensbergen 6572bad8471SEric Van Hensbergen /** 6582bad8471SEric Van Hensbergen * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 6592bad8471SEric Van Hensbergen * @dir: inode that is being walked from 6602bad8471SEric Van Hensbergen * @dentry: dentry that is being walked to? 6612bad8471SEric Van Hensbergen * @nameidata: path data 6622bad8471SEric Van Hensbergen * 6632bad8471SEric Van Hensbergen */ 6642bad8471SEric Van Hensbergen 6652bad8471SEric Van Hensbergen static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 6662bad8471SEric Van Hensbergen struct nameidata *nameidata) 6672bad8471SEric Van Hensbergen { 6682bad8471SEric Van Hensbergen struct super_block *sb; 6692bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses; 670bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *fid; 6712bad8471SEric Van Hensbergen struct inode *inode; 672bd238fb4SLatchesar Ionkov char *name; 6732bad8471SEric Van Hensbergen int result = 0; 6742bad8471SEric Van Hensbergen 675bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 676731805b4SLatchesar Ionkov dir, dentry->d_name.name, dentry, nameidata); 6772bad8471SEric Van Hensbergen 67811e9b49bSSripathi Kodi if (dentry->d_name.len > NAME_MAX) 67911e9b49bSSripathi Kodi return ERR_PTR(-ENAMETOOLONG); 68011e9b49bSSripathi Kodi 6812bad8471SEric Van Hensbergen sb = dir->i_sb; 6822bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(dir); 683bd238fb4SLatchesar Ionkov dfid = v9fs_fid_lookup(dentry->d_parent); 684bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) 685e231c2eeSDavid Howells return ERR_CAST(dfid); 6862bad8471SEric Van Hensbergen 687bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 688bd238fb4SLatchesar Ionkov fid = p9_client_walk(dfid, 1, &name, 1); 689bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 690bd238fb4SLatchesar Ionkov result = PTR_ERR(fid); 6912bad8471SEric Van Hensbergen if (result == -ENOENT) { 69285e0df24SAneesh Kumar K.V inode = NULL; 69385e0df24SAneesh Kumar K.V goto inst_out; 6942bad8471SEric Van Hensbergen } 6952bad8471SEric Van Hensbergen 696bd238fb4SLatchesar Ionkov return ERR_PTR(result); 6972bad8471SEric Van Hensbergen } 6982bad8471SEric Van Hensbergen 699bd238fb4SLatchesar Ionkov inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 700bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 701bd238fb4SLatchesar Ionkov result = PTR_ERR(inode); 702bd238fb4SLatchesar Ionkov inode = NULL; 703bd238fb4SLatchesar Ionkov goto error; 7042bad8471SEric Van Hensbergen } 7052bad8471SEric Van Hensbergen 706bd238fb4SLatchesar Ionkov result = v9fs_fid_add(dentry, fid); 7076a3124a3SLatchesar Ionkov if (result < 0) 708bd238fb4SLatchesar Ionkov goto error; 7096a3124a3SLatchesar Ionkov 71085e0df24SAneesh Kumar K.V inst_out: 71185e0df24SAneesh Kumar K.V if (v9ses->cache) 712e03abc0cSEric Van Hensbergen dentry->d_op = &v9fs_cached_dentry_operations; 713e03abc0cSEric Van Hensbergen else 714e03abc0cSEric Van Hensbergen dentry->d_op = &v9fs_dentry_operations; 7152bad8471SEric Van Hensbergen 7162bad8471SEric Van Hensbergen d_add(dentry, inode); 7172bad8471SEric Van Hensbergen return NULL; 7182bad8471SEric Van Hensbergen 719bd238fb4SLatchesar Ionkov error: 720bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 721da977b2cSEric Van Hensbergen 7222bad8471SEric Van Hensbergen return ERR_PTR(result); 7232bad8471SEric Van Hensbergen } 7242bad8471SEric Van Hensbergen 7252bad8471SEric Van Hensbergen /** 7262bad8471SEric Van Hensbergen * v9fs_vfs_unlink - VFS unlink hook to delete an inode 7272bad8471SEric Van Hensbergen * @i: inode that is being unlinked 72873c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7292bad8471SEric Van Hensbergen * 7302bad8471SEric Van Hensbergen */ 7312bad8471SEric Van Hensbergen 7322bad8471SEric Van Hensbergen static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 7332bad8471SEric Van Hensbergen { 7342bad8471SEric Van Hensbergen return v9fs_remove(i, d, 0); 7352bad8471SEric Van Hensbergen } 7362bad8471SEric Van Hensbergen 7372bad8471SEric Van Hensbergen /** 7382bad8471SEric Van Hensbergen * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 7392bad8471SEric Van Hensbergen * @i: inode that is being unlinked 74073c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7412bad8471SEric Van Hensbergen * 7422bad8471SEric Van Hensbergen */ 7432bad8471SEric Van Hensbergen 7442bad8471SEric Van Hensbergen static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 7452bad8471SEric Van Hensbergen { 7462bad8471SEric Van Hensbergen return v9fs_remove(i, d, 1); 7472bad8471SEric Van Hensbergen } 7482bad8471SEric Van Hensbergen 7492bad8471SEric Van Hensbergen /** 7502bad8471SEric Van Hensbergen * v9fs_vfs_rename - VFS hook to rename an inode 7512bad8471SEric Van Hensbergen * @old_dir: old dir inode 7522bad8471SEric Van Hensbergen * @old_dentry: old dentry 7532bad8471SEric Van Hensbergen * @new_dir: new dir inode 7542bad8471SEric Van Hensbergen * @new_dentry: new dentry 7552bad8471SEric Van Hensbergen * 7562bad8471SEric Van Hensbergen */ 7572bad8471SEric Van Hensbergen 7582bad8471SEric Van Hensbergen static int 7592bad8471SEric Van Hensbergen v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 7602bad8471SEric Van Hensbergen struct inode *new_dir, struct dentry *new_dentry) 7612bad8471SEric Van Hensbergen { 762bd238fb4SLatchesar Ionkov struct inode *old_inode; 763bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 764bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 765bd238fb4SLatchesar Ionkov struct p9_fid *olddirfid; 766bd238fb4SLatchesar Ionkov struct p9_fid *newdirfid; 767bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 768bd238fb4SLatchesar Ionkov int retval; 7692bad8471SEric Van Hensbergen 770bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 771bd238fb4SLatchesar Ionkov retval = 0; 772bd238fb4SLatchesar Ionkov old_inode = old_dentry->d_inode; 773bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(old_inode); 774bd238fb4SLatchesar Ionkov oldfid = v9fs_fid_lookup(old_dentry); 775da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 776da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 777da977b2cSEric Van Hensbergen 778da977b2cSEric Van Hensbergen olddirfid = v9fs_fid_clone(old_dentry->d_parent); 779da977b2cSEric Van Hensbergen if (IS_ERR(olddirfid)) { 780da977b2cSEric Van Hensbergen retval = PTR_ERR(olddirfid); 781bd238fb4SLatchesar Ionkov goto done; 782da977b2cSEric Van Hensbergen } 783da977b2cSEric Van Hensbergen 784da977b2cSEric Van Hensbergen newdirfid = v9fs_fid_clone(new_dentry->d_parent); 785da977b2cSEric Van Hensbergen if (IS_ERR(newdirfid)) { 786da977b2cSEric Van Hensbergen retval = PTR_ERR(newdirfid); 787bd238fb4SLatchesar Ionkov goto clunk_olddir; 7882bad8471SEric Van Hensbergen } 7892bad8471SEric Van Hensbergen 7904681dbdaSSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 7914681dbdaSSripathi Kodi retval = p9_client_rename(oldfid, newdirfid, 7924681dbdaSSripathi Kodi (char *) new_dentry->d_name.name); 7934681dbdaSSripathi Kodi if (retval != -ENOSYS) 7944681dbdaSSripathi Kodi goto clunk_newdir; 7954681dbdaSSripathi Kodi } 7964681dbdaSSripathi Kodi 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); 9011025774cSChristoph Hellwig if (retval < 0) 902bd238fb4SLatchesar Ionkov return retval; 9031025774cSChristoph Hellwig 9041025774cSChristoph Hellwig if ((iattr->ia_valid & ATTR_SIZE) && 9051025774cSChristoph Hellwig iattr->ia_size != i_size_read(dentry->d_inode)) { 9061025774cSChristoph Hellwig retval = vmtruncate(dentry->d_inode, iattr->ia_size); 9071025774cSChristoph Hellwig if (retval) 9081025774cSChristoph Hellwig return retval; 9091025774cSChristoph Hellwig } 9101025774cSChristoph Hellwig 9111025774cSChristoph Hellwig setattr_copy(dentry->d_inode, iattr); 9121025774cSChristoph Hellwig mark_inode_dirty(dentry->d_inode); 9131025774cSChristoph Hellwig return 0; 9142bad8471SEric Van Hensbergen } 9152bad8471SEric Van Hensbergen 9162bad8471SEric Van Hensbergen /** 917531b1094SLatchesar Ionkov * v9fs_stat2inode - populate an inode structure with mistat info 918531b1094SLatchesar Ionkov * @stat: Plan 9 metadata (mistat) structure 9192bad8471SEric Van Hensbergen * @inode: inode to populate 9202bad8471SEric Van Hensbergen * @sb: superblock of filesystem 9212bad8471SEric Van Hensbergen * 9222bad8471SEric Van Hensbergen */ 9232bad8471SEric Van Hensbergen 9242bad8471SEric Van Hensbergen void 92551a87c55SEric Van Hensbergen v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 9262bad8471SEric Van Hensbergen struct super_block *sb) 9272bad8471SEric Van Hensbergen { 928531b1094SLatchesar Ionkov char ext[32]; 9295717144aSAneesh Kumar K.V char tag_name[14]; 9305717144aSAneesh Kumar K.V unsigned int i_nlink; 9312bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 9322bad8471SEric Van Hensbergen 9332bad8471SEric Van Hensbergen inode->i_nlink = 1; 9342bad8471SEric Van Hensbergen 935531b1094SLatchesar Ionkov inode->i_atime.tv_sec = stat->atime; 936531b1094SLatchesar Ionkov inode->i_mtime.tv_sec = stat->mtime; 937531b1094SLatchesar Ionkov inode->i_ctime.tv_sec = stat->mtime; 9382bad8471SEric Van Hensbergen 939bd32b82dSLatchesar Ionkov inode->i_uid = v9ses->dfltuid; 940bd32b82dSLatchesar Ionkov inode->i_gid = v9ses->dfltgid; 9412bad8471SEric Van Hensbergen 942dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 943531b1094SLatchesar Ionkov inode->i_uid = stat->n_uid; 944531b1094SLatchesar Ionkov inode->i_gid = stat->n_gid; 945531b1094SLatchesar Ionkov } 9465717144aSAneesh Kumar K.V if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 9475717144aSAneesh Kumar K.V if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 9485717144aSAneesh Kumar K.V /* 9495717144aSAneesh Kumar K.V * Hadlink support got added later to 9505717144aSAneesh Kumar K.V * to the .u extension. So there can be 9515717144aSAneesh Kumar K.V * server out there that doesn't support 9525717144aSAneesh Kumar K.V * this even with .u extension. So check 9535717144aSAneesh Kumar K.V * for non NULL stat->extension 9545717144aSAneesh Kumar K.V */ 9555717144aSAneesh Kumar K.V strncpy(ext, stat->extension, sizeof(ext)); 9565717144aSAneesh Kumar K.V /* HARDLINKCOUNT %u */ 9575717144aSAneesh Kumar K.V sscanf(ext, "%13s %u", tag_name, &i_nlink); 9585717144aSAneesh Kumar K.V if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 9595717144aSAneesh Kumar K.V inode->i_nlink = i_nlink; 9605717144aSAneesh Kumar K.V } 9615717144aSAneesh Kumar K.V } 962531b1094SLatchesar Ionkov inode->i_mode = p9mode2unixmode(v9ses, stat->mode); 9632bad8471SEric Van Hensbergen if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 9642bad8471SEric Van Hensbergen char type = 0; 9652bad8471SEric Van Hensbergen int major = -1; 9662bad8471SEric Van Hensbergen int minor = -1; 967531b1094SLatchesar Ionkov 96851a87c55SEric Van Hensbergen strncpy(ext, stat->extension, sizeof(ext)); 969531b1094SLatchesar Ionkov sscanf(ext, "%c %u %u", &type, &major, &minor); 9702bad8471SEric Van Hensbergen switch (type) { 9712bad8471SEric Van Hensbergen case 'c': 9722bad8471SEric Van Hensbergen inode->i_mode &= ~S_IFBLK; 9732bad8471SEric Van Hensbergen inode->i_mode |= S_IFCHR; 9742bad8471SEric Van Hensbergen break; 9752bad8471SEric Van Hensbergen case 'b': 9762bad8471SEric Van Hensbergen break; 9772bad8471SEric Van Hensbergen default: 978bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 97951a87c55SEric Van Hensbergen "Unknown special type %c %s\n", type, 98051a87c55SEric Van Hensbergen stat->extension); 9812bad8471SEric Van Hensbergen }; 9822bad8471SEric Van Hensbergen inode->i_rdev = MKDEV(major, minor); 98357c7b4e6SMagnus Deininger init_special_inode(inode, inode->i_mode, inode->i_rdev); 9842bad8471SEric Van Hensbergen } else 9852bad8471SEric Van Hensbergen inode->i_rdev = 0; 9862bad8471SEric Van Hensbergen 9877549ae3eSAbhishek Kulkarni i_size_write(inode, stat->length); 9882bad8471SEric Van Hensbergen 989bd238fb4SLatchesar Ionkov /* not real number of blocks, but 512 byte ones ... */ 9907549ae3eSAbhishek Kulkarni inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 9912bad8471SEric Van Hensbergen } 9922bad8471SEric Van Hensbergen 9932bad8471SEric Van Hensbergen /** 9942bad8471SEric Van Hensbergen * v9fs_qid2ino - convert qid into inode number 9952bad8471SEric Van Hensbergen * @qid: qid to hash 9962bad8471SEric Van Hensbergen * 9972bad8471SEric Van Hensbergen * BUG: potential for inode number collisions? 9982bad8471SEric Van Hensbergen */ 9992bad8471SEric Van Hensbergen 1000bd238fb4SLatchesar Ionkov ino_t v9fs_qid2ino(struct p9_qid *qid) 10012bad8471SEric Van Hensbergen { 10022bad8471SEric Van Hensbergen u64 path = qid->path + 2; 10032bad8471SEric Van Hensbergen ino_t i = 0; 10042bad8471SEric Van Hensbergen 10052bad8471SEric Van Hensbergen if (sizeof(ino_t) == sizeof(path)) 10062bad8471SEric Van Hensbergen memcpy(&i, &path, sizeof(ino_t)); 10072bad8471SEric Van Hensbergen else 10082bad8471SEric Van Hensbergen i = (ino_t) (path ^ (path >> 32)); 10092bad8471SEric Van Hensbergen 10102bad8471SEric Van Hensbergen return i; 10112bad8471SEric Van Hensbergen } 10122bad8471SEric Van Hensbergen 10132bad8471SEric Van Hensbergen /** 10142bad8471SEric Van Hensbergen * v9fs_readlink - read a symlink's location (internal version) 10152bad8471SEric Van Hensbergen * @dentry: dentry for symlink 101673c592b9SEric Van Hensbergen * @buffer: buffer to load symlink location into 10172bad8471SEric Van Hensbergen * @buflen: length of buffer 10182bad8471SEric Van Hensbergen * 10192bad8471SEric Van Hensbergen */ 10202bad8471SEric Van Hensbergen 10212bad8471SEric Van Hensbergen static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 10222bad8471SEric Van Hensbergen { 1023bd238fb4SLatchesar Ionkov int retval; 10242bad8471SEric Van Hensbergen 1025bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1026bd238fb4SLatchesar Ionkov struct p9_fid *fid; 102751a87c55SEric Van Hensbergen struct p9_wstat *st; 10282bad8471SEric Van Hensbergen 1029bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 1030bd238fb4SLatchesar Ionkov retval = -EPERM; 1031bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 1032bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1033da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 1034da977b2cSEric Van Hensbergen return PTR_ERR(fid); 10352bad8471SEric Van Hensbergen 1036dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) 1037bd238fb4SLatchesar Ionkov return -EBADF; 10382bad8471SEric Van Hensbergen 1039bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 1040bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 1041bd238fb4SLatchesar Ionkov return PTR_ERR(st); 10422bad8471SEric Van Hensbergen 1043bd238fb4SLatchesar Ionkov if (!(st->mode & P9_DMSYMLINK)) { 10442bad8471SEric Van Hensbergen retval = -EINVAL; 1045bd238fb4SLatchesar Ionkov goto done; 10462bad8471SEric Van Hensbergen } 10472bad8471SEric Van Hensbergen 10482bad8471SEric Van Hensbergen /* copy extension buffer into buffer */ 104951a87c55SEric Van Hensbergen strncpy(buffer, st->extension, buflen); 10502bad8471SEric Van Hensbergen 1051bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 105251a87c55SEric Van Hensbergen "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); 1053bd238fb4SLatchesar Ionkov 10542511cd0bSMartin Stava retval = strnlen(buffer, buflen); 1055bd238fb4SLatchesar Ionkov done: 1056bd238fb4SLatchesar Ionkov kfree(st); 10572bad8471SEric Van Hensbergen return retval; 10582bad8471SEric Van Hensbergen } 10592bad8471SEric Van Hensbergen 10602bad8471SEric Van Hensbergen /** 10612bad8471SEric Van Hensbergen * v9fs_vfs_follow_link - follow a symlink path 10622bad8471SEric Van Hensbergen * @dentry: dentry for symlink 10632bad8471SEric Van Hensbergen * @nd: nameidata 10642bad8471SEric Van Hensbergen * 10652bad8471SEric Van Hensbergen */ 10662bad8471SEric Van Hensbergen 10672bad8471SEric Van Hensbergen static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 10682bad8471SEric Van Hensbergen { 10692bad8471SEric Van Hensbergen int len = 0; 10702bad8471SEric Van Hensbergen char *link = __getname(); 10712bad8471SEric Van Hensbergen 1072bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); 10732bad8471SEric Van Hensbergen 10742bad8471SEric Van Hensbergen if (!link) 10752bad8471SEric Van Hensbergen link = ERR_PTR(-ENOMEM); 10762bad8471SEric Van Hensbergen else { 107716cce6d2SLatchesar Ionkov len = v9fs_readlink(dentry, link, PATH_MAX); 10782bad8471SEric Van Hensbergen 10792bad8471SEric Van Hensbergen if (len < 0) { 1080ce44eeb6SDavi Arnaut __putname(link); 10812bad8471SEric Van Hensbergen link = ERR_PTR(len); 10822bad8471SEric Van Hensbergen } else 10832511cd0bSMartin Stava link[min(len, PATH_MAX-1)] = 0; 10842bad8471SEric Van Hensbergen } 10852bad8471SEric Van Hensbergen nd_set_link(nd, link); 10862bad8471SEric Van Hensbergen 10872bad8471SEric Van Hensbergen return NULL; 10882bad8471SEric Van Hensbergen } 10892bad8471SEric Van Hensbergen 10902bad8471SEric Van Hensbergen /** 10912bad8471SEric Van Hensbergen * v9fs_vfs_put_link - release a symlink path 10922bad8471SEric Van Hensbergen * @dentry: dentry for symlink 10932bad8471SEric Van Hensbergen * @nd: nameidata 1094ee443996SEric Van Hensbergen * @p: unused 10952bad8471SEric Van Hensbergen * 10962bad8471SEric Van Hensbergen */ 10972bad8471SEric Van Hensbergen 1098ee443996SEric Van Hensbergen static void 1099ee443996SEric Van Hensbergen v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 11002bad8471SEric Van Hensbergen { 11012bad8471SEric Van Hensbergen char *s = nd_get_link(nd); 11022bad8471SEric Van Hensbergen 11036ff23207SDuane Griffin P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, 11046ff23207SDuane Griffin IS_ERR(s) ? "<error>" : s); 11052bad8471SEric Van Hensbergen if (!IS_ERR(s)) 1106ce44eeb6SDavi Arnaut __putname(s); 11072bad8471SEric Van Hensbergen } 11082bad8471SEric Van Hensbergen 1109ee443996SEric Van Hensbergen /** 1110ee443996SEric Van Hensbergen * v9fs_vfs_mkspecial - create a special file 1111ee443996SEric Van Hensbergen * @dir: inode to create special file in 1112ee443996SEric Van Hensbergen * @dentry: dentry to create 1113ee443996SEric Van Hensbergen * @mode: mode to create special file 1114ee443996SEric Van Hensbergen * @extension: 9p2000.u format extension string representing special file 1115ee443996SEric Van Hensbergen * 1116ee443996SEric Van Hensbergen */ 1117ee443996SEric Van Hensbergen 1118531b1094SLatchesar Ionkov static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1119531b1094SLatchesar Ionkov int mode, const char *extension) 1120531b1094SLatchesar Ionkov { 1121bd238fb4SLatchesar Ionkov u32 perm; 1122531b1094SLatchesar Ionkov struct v9fs_session_info *v9ses; 1123bd238fb4SLatchesar Ionkov struct p9_fid *fid; 1124531b1094SLatchesar Ionkov 11256a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 1126dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) { 1127bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); 11286a3124a3SLatchesar Ionkov return -EPERM; 1129531b1094SLatchesar Ionkov } 1130531b1094SLatchesar Ionkov 1131da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 1132bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1133bd238fb4SLatchesar Ionkov P9_OREAD); 1134bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) 1135bd238fb4SLatchesar Ionkov return PTR_ERR(fid); 1136da977b2cSEric Van Hensbergen 1137bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 11386a3124a3SLatchesar Ionkov return 0; 1139531b1094SLatchesar Ionkov } 1140531b1094SLatchesar Ionkov 1141531b1094SLatchesar Ionkov /** 1142531b1094SLatchesar Ionkov * v9fs_vfs_symlink - helper function to create symlinks 1143531b1094SLatchesar Ionkov * @dir: directory inode containing symlink 1144531b1094SLatchesar Ionkov * @dentry: dentry for symlink 1145531b1094SLatchesar Ionkov * @symname: symlink data 1146531b1094SLatchesar Ionkov * 1147ee443996SEric Van Hensbergen * See Also: 9P2000.u RFC for more information 1148531b1094SLatchesar Ionkov * 1149531b1094SLatchesar Ionkov */ 1150531b1094SLatchesar Ionkov 1151531b1094SLatchesar Ionkov static int 1152531b1094SLatchesar Ionkov v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1153531b1094SLatchesar Ionkov { 1154bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, 1155bd238fb4SLatchesar Ionkov dentry->d_name.name, symname); 1156531b1094SLatchesar Ionkov 1157531b1094SLatchesar Ionkov return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1158531b1094SLatchesar Ionkov } 1159531b1094SLatchesar Ionkov 11602bad8471SEric Van Hensbergen /** 11612bad8471SEric Van Hensbergen * v9fs_vfs_link - create a hardlink 11622bad8471SEric Van Hensbergen * @old_dentry: dentry for file to link to 11632bad8471SEric Van Hensbergen * @dir: inode destination for new link 116473c592b9SEric Van Hensbergen * @dentry: dentry for link 11652bad8471SEric Van Hensbergen * 11662bad8471SEric Van Hensbergen */ 11672bad8471SEric Van Hensbergen 11682bad8471SEric Van Hensbergen static int 11692bad8471SEric Van Hensbergen v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 11702bad8471SEric Van Hensbergen struct dentry *dentry) 11712bad8471SEric Van Hensbergen { 1172531b1094SLatchesar Ionkov int retval; 1173bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 1174531b1094SLatchesar Ionkov char *name; 11752bad8471SEric Van Hensbergen 1176bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1177bd238fb4SLatchesar Ionkov " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 11782bad8471SEric Van Hensbergen old_dentry->d_name.name); 11792bad8471SEric Van Hensbergen 1180da977b2cSEric Van Hensbergen oldfid = v9fs_fid_clone(old_dentry); 1181da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 1182da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 11832bad8471SEric Van Hensbergen 1184531b1094SLatchesar Ionkov name = __getname(); 1185da977b2cSEric Van Hensbergen if (unlikely(!name)) { 1186da977b2cSEric Van Hensbergen retval = -ENOMEM; 1187da977b2cSEric Van Hensbergen goto clunk_fid; 1188da977b2cSEric Van Hensbergen } 11890710d36aSFlorin Malita 119016cce6d2SLatchesar Ionkov sprintf(name, "%d\n", oldfid->fid); 1191bd238fb4SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1192531b1094SLatchesar Ionkov __putname(name); 11932bad8471SEric Van Hensbergen 1194da977b2cSEric Van Hensbergen clunk_fid: 1195bd238fb4SLatchesar Ionkov p9_client_clunk(oldfid); 11962bad8471SEric Van Hensbergen return retval; 11972bad8471SEric Van Hensbergen } 11982bad8471SEric Van Hensbergen 11992bad8471SEric Van Hensbergen /** 12002bad8471SEric Van Hensbergen * v9fs_vfs_mknod - create a special file 12012bad8471SEric Van Hensbergen * @dir: inode destination for new link 12022bad8471SEric Van Hensbergen * @dentry: dentry for file 12032bad8471SEric Van Hensbergen * @mode: mode for creation 1204ee443996SEric Van Hensbergen * @rdev: device associated with special file 12052bad8471SEric Van Hensbergen * 12062bad8471SEric Van Hensbergen */ 12072bad8471SEric Van Hensbergen 12082bad8471SEric Van Hensbergen static int 12092bad8471SEric Van Hensbergen v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 12102bad8471SEric Van Hensbergen { 1211531b1094SLatchesar Ionkov int retval; 1212531b1094SLatchesar Ionkov char *name; 12132bad8471SEric Van Hensbergen 1214bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1215bd238fb4SLatchesar Ionkov " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 12162bad8471SEric Van Hensbergen dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 12172bad8471SEric Van Hensbergen 1218531b1094SLatchesar Ionkov if (!new_valid_dev(rdev)) 1219531b1094SLatchesar Ionkov return -EINVAL; 122073c592b9SEric Van Hensbergen 1221531b1094SLatchesar Ionkov name = __getname(); 1222c0291a05SEugene Teo if (!name) 1223c0291a05SEugene Teo return -ENOMEM; 12242bad8471SEric Van Hensbergen /* build extension */ 12252bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 1226531b1094SLatchesar Ionkov sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 12272bad8471SEric Van Hensbergen else if (S_ISCHR(mode)) 1228531b1094SLatchesar Ionkov sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 122973c592b9SEric Van Hensbergen else if (S_ISFIFO(mode)) 1230531b1094SLatchesar Ionkov *name = 0; 123175cc5c9bSVenkateswararao Jujjuri else if (S_ISSOCK(mode)) 123275cc5c9bSVenkateswararao Jujjuri *name = 0; 12332bad8471SEric Van Hensbergen else { 1234531b1094SLatchesar Ionkov __putname(name); 1235531b1094SLatchesar Ionkov return -EINVAL; 12362bad8471SEric Van Hensbergen } 12372bad8471SEric Van Hensbergen 1238531b1094SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1239531b1094SLatchesar Ionkov __putname(name); 12402bad8471SEric Van Hensbergen 12412bad8471SEric Van Hensbergen return retval; 12422bad8471SEric Van Hensbergen } 12432bad8471SEric Van Hensbergen 12449b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotu = { 12459b6533c9SSripathi Kodi .create = v9fs_vfs_create, 12469b6533c9SSripathi Kodi .lookup = v9fs_vfs_lookup, 12479b6533c9SSripathi Kodi .symlink = v9fs_vfs_symlink, 12489b6533c9SSripathi Kodi .link = v9fs_vfs_link, 12499b6533c9SSripathi Kodi .unlink = v9fs_vfs_unlink, 12509b6533c9SSripathi Kodi .mkdir = v9fs_vfs_mkdir, 12519b6533c9SSripathi Kodi .rmdir = v9fs_vfs_rmdir, 12529b6533c9SSripathi Kodi .mknod = v9fs_vfs_mknod, 12539b6533c9SSripathi Kodi .rename = v9fs_vfs_rename, 12549b6533c9SSripathi Kodi .getattr = v9fs_vfs_getattr, 12559b6533c9SSripathi Kodi .setattr = v9fs_vfs_setattr, 12569b6533c9SSripathi Kodi }; 12579b6533c9SSripathi Kodi 12589b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotl = { 12592bad8471SEric Van Hensbergen .create = v9fs_vfs_create, 12602bad8471SEric Van Hensbergen .lookup = v9fs_vfs_lookup, 12612bad8471SEric Van Hensbergen .symlink = v9fs_vfs_symlink, 12622bad8471SEric Van Hensbergen .link = v9fs_vfs_link, 12632bad8471SEric Van Hensbergen .unlink = v9fs_vfs_unlink, 12642bad8471SEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 12652bad8471SEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 12662bad8471SEric Van Hensbergen .mknod = v9fs_vfs_mknod, 12672bad8471SEric Van Hensbergen .rename = v9fs_vfs_rename, 12682bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 12692bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 12702bad8471SEric Van Hensbergen }; 12712bad8471SEric Van Hensbergen 1272754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations = { 1273b501611aSEric Van Hensbergen .create = v9fs_vfs_create, 1274b501611aSEric Van Hensbergen .lookup = v9fs_vfs_lookup, 1275b501611aSEric Van Hensbergen .unlink = v9fs_vfs_unlink, 1276b501611aSEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 1277b501611aSEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 1278b501611aSEric Van Hensbergen .mknod = v9fs_vfs_mknod, 1279b501611aSEric Van Hensbergen .rename = v9fs_vfs_rename, 1280b501611aSEric Van Hensbergen .getattr = v9fs_vfs_getattr, 1281b501611aSEric Van Hensbergen .setattr = v9fs_vfs_setattr, 1282b501611aSEric Van Hensbergen }; 1283b501611aSEric Van Hensbergen 1284754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations = { 12852bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 12862bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 12872bad8471SEric Van Hensbergen }; 12882bad8471SEric Van Hensbergen 12899b6533c9SSripathi Kodi static const struct inode_operations v9fs_file_inode_operations_dotl = { 12909b6533c9SSripathi Kodi .getattr = v9fs_vfs_getattr, 12919b6533c9SSripathi Kodi .setattr = v9fs_vfs_setattr, 12929b6533c9SSripathi Kodi }; 12939b6533c9SSripathi Kodi 1294754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations = { 1295204f2f0eSAl Viro .readlink = generic_readlink, 12962bad8471SEric Van Hensbergen .follow_link = v9fs_vfs_follow_link, 12972bad8471SEric Van Hensbergen .put_link = v9fs_vfs_put_link, 12982bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 12992bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 13002bad8471SEric Van Hensbergen }; 13019b6533c9SSripathi Kodi 13029b6533c9SSripathi Kodi static const struct inode_operations v9fs_symlink_inode_operations_dotl = { 13039b6533c9SSripathi Kodi .readlink = generic_readlink, 13049b6533c9SSripathi Kodi .follow_link = v9fs_vfs_follow_link, 13059b6533c9SSripathi Kodi .put_link = v9fs_vfs_put_link, 13069b6533c9SSripathi Kodi .getattr = v9fs_vfs_getattr, 13079b6533c9SSripathi Kodi .setattr = v9fs_vfs_setattr, 13089b6533c9SSripathi Kodi }; 1309