12bad8471SEric Van Hensbergen /* 22bad8471SEric Van Hensbergen * linux/fs/9p/vfs_inode.c 32bad8471SEric Van Hensbergen * 473c592b9SEric Van Hensbergen * This file contains vfs inode ops for the 9P2000 protocol. 52bad8471SEric Van Hensbergen * 62bad8471SEric Van Hensbergen * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> 72bad8471SEric Van Hensbergen * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 82bad8471SEric Van Hensbergen * 92bad8471SEric Van Hensbergen * This program is free software; you can redistribute it and/or modify 1042e8c509SEric Van Hensbergen * it under the terms of the GNU General Public License version 2 1142e8c509SEric Van Hensbergen * as published by the Free Software Foundation. 122bad8471SEric Van Hensbergen * 132bad8471SEric Van Hensbergen * This program is distributed in the hope that it will be useful, 142bad8471SEric Van Hensbergen * but WITHOUT ANY WARRANTY; without even the implied warranty of 152bad8471SEric Van Hensbergen * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 162bad8471SEric Van Hensbergen * GNU General Public License for more details. 172bad8471SEric Van Hensbergen * 182bad8471SEric Van Hensbergen * You should have received a copy of the GNU General Public License 192bad8471SEric Van Hensbergen * along with this program; if not, write to: 202bad8471SEric Van Hensbergen * Free Software Foundation 212bad8471SEric Van Hensbergen * 51 Franklin Street, Fifth Floor 222bad8471SEric Van Hensbergen * Boston, MA 02111-1301 USA 232bad8471SEric Van Hensbergen * 242bad8471SEric Van Hensbergen */ 252bad8471SEric Van Hensbergen 262bad8471SEric Van Hensbergen #include <linux/module.h> 272bad8471SEric Van Hensbergen #include <linux/errno.h> 282bad8471SEric Van Hensbergen #include <linux/fs.h> 292bad8471SEric Van Hensbergen #include <linux/file.h> 302bad8471SEric Van Hensbergen #include <linux/pagemap.h> 312bad8471SEric Van Hensbergen #include <linux/stat.h> 322bad8471SEric Van Hensbergen #include <linux/string.h> 332bad8471SEric Van Hensbergen #include <linux/inet.h> 342bad8471SEric Van Hensbergen #include <linux/namei.h> 352bad8471SEric Van Hensbergen #include <linux/idr.h> 36e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 375a0e3ad6STejun Heo #include <linux/slab.h> 38ebf46264SAneesh Kumar K.V #include <linux/xattr.h> 3985ff872dSAneesh Kumar K.V #include <linux/posix_acl.h> 40bd238fb4SLatchesar Ionkov #include <net/9p/9p.h> 41bd238fb4SLatchesar Ionkov #include <net/9p/client.h> 422bad8471SEric Van Hensbergen 432bad8471SEric Van Hensbergen #include "v9fs.h" 442bad8471SEric Van Hensbergen #include "v9fs_vfs.h" 452bad8471SEric Van Hensbergen #include "fid.h" 4660e78d2cSAbhishek Kulkarni #include "cache.h" 47ebf46264SAneesh Kumar K.V #include "xattr.h" 4885ff872dSAneesh Kumar K.V #include "acl.h" 492bad8471SEric Van Hensbergen 50754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations; 519b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotu; 52754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations; 53754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations; 54f5fc6145SAneesh Kumar K.V 552bad8471SEric Van Hensbergen /** 562bad8471SEric Van Hensbergen * unixmode2p9mode - convert unix mode bits to plan 9 572bad8471SEric Van Hensbergen * @v9ses: v9fs session information 582bad8471SEric Van Hensbergen * @mode: mode to convert 592bad8471SEric Van Hensbergen * 602bad8471SEric Van Hensbergen */ 612bad8471SEric Van Hensbergen 62c2837de7SAl Viro static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) 632bad8471SEric Van Hensbergen { 642bad8471SEric Van Hensbergen int res; 652bad8471SEric Van Hensbergen res = mode & 0777; 662bad8471SEric Van Hensbergen if (S_ISDIR(mode)) 67bd238fb4SLatchesar Ionkov res |= P9_DMDIR; 68dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 692bad8471SEric Van Hensbergen if (v9ses->nodev == 0) { 702bad8471SEric Van Hensbergen if (S_ISSOCK(mode)) 71bd238fb4SLatchesar Ionkov res |= P9_DMSOCKET; 722bad8471SEric Van Hensbergen if (S_ISFIFO(mode)) 73bd238fb4SLatchesar Ionkov res |= P9_DMNAMEDPIPE; 742bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 75bd238fb4SLatchesar Ionkov res |= P9_DMDEVICE; 762bad8471SEric Van Hensbergen if (S_ISCHR(mode)) 77bd238fb4SLatchesar Ionkov res |= P9_DMDEVICE; 782bad8471SEric Van Hensbergen } 792bad8471SEric Van Hensbergen 802bad8471SEric Van Hensbergen if ((mode & S_ISUID) == S_ISUID) 81bd238fb4SLatchesar Ionkov res |= P9_DMSETUID; 822bad8471SEric Van Hensbergen if ((mode & S_ISGID) == S_ISGID) 83bd238fb4SLatchesar Ionkov res |= P9_DMSETGID; 84d199d652SAnthony Liguori if ((mode & S_ISVTX) == S_ISVTX) 85d199d652SAnthony Liguori res |= P9_DMSETVTX; 862bad8471SEric Van Hensbergen } 872bad8471SEric Van Hensbergen return res; 882bad8471SEric Van Hensbergen } 892bad8471SEric Van Hensbergen 902bad8471SEric Van Hensbergen /** 912bad8471SEric Van Hensbergen * p9mode2unixmode- convert plan9 mode bits to unix mode bits 922bad8471SEric Van Hensbergen * @v9ses: v9fs session information 9345089142SAneesh Kumar K.V * @stat: p9_wstat from which mode need to be derived 9445089142SAneesh Kumar K.V * @rdev: major number, minor number in case of device files. 952bad8471SEric Van Hensbergen * 962bad8471SEric Van Hensbergen */ 9745089142SAneesh Kumar K.V static int p9mode2unixmode(struct v9fs_session_info *v9ses, 9845089142SAneesh Kumar K.V struct p9_wstat *stat, dev_t *rdev) 992bad8471SEric Van Hensbergen { 1002bad8471SEric Van Hensbergen int res; 10145089142SAneesh Kumar K.V int mode = stat->mode; 1022bad8471SEric Van Hensbergen 10345089142SAneesh Kumar K.V res = mode & S_IALLUGO; 10445089142SAneesh Kumar K.V *rdev = 0; 1052bad8471SEric Van Hensbergen 106bd238fb4SLatchesar Ionkov if ((mode & P9_DMDIR) == P9_DMDIR) 1072bad8471SEric Van Hensbergen res |= S_IFDIR; 108dd6102fbSSripathi Kodi else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) 1092bad8471SEric Van Hensbergen res |= S_IFLNK; 110dd6102fbSSripathi Kodi else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) 1112bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1122bad8471SEric Van Hensbergen res |= S_IFSOCK; 113dd6102fbSSripathi Kodi else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) 1142bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1152bad8471SEric Van Hensbergen res |= S_IFIFO; 116dd6102fbSSripathi Kodi else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) 11745089142SAneesh Kumar K.V && (v9ses->nodev == 0)) { 11845089142SAneesh Kumar K.V char type = 0, ext[32]; 11945089142SAneesh Kumar K.V int major = -1, minor = -1; 12045089142SAneesh Kumar K.V 12145089142SAneesh Kumar K.V strncpy(ext, stat->extension, sizeof(ext)); 12245089142SAneesh Kumar K.V sscanf(ext, "%c %u %u", &type, &major, &minor); 12345089142SAneesh Kumar K.V switch (type) { 12445089142SAneesh Kumar K.V case 'c': 12545089142SAneesh Kumar K.V res |= S_IFCHR; 12645089142SAneesh Kumar K.V break; 12745089142SAneesh Kumar K.V case 'b': 1282bad8471SEric Van Hensbergen res |= S_IFBLK; 12945089142SAneesh Kumar K.V break; 13045089142SAneesh Kumar K.V default: 13145089142SAneesh Kumar K.V P9_DPRINTK(P9_DEBUG_ERROR, 13245089142SAneesh Kumar K.V "Unknown special type %c %s\n", type, 13345089142SAneesh Kumar K.V stat->extension); 13445089142SAneesh Kumar K.V }; 13545089142SAneesh Kumar K.V *rdev = MKDEV(major, minor); 13645089142SAneesh Kumar K.V } else 1372bad8471SEric Van Hensbergen res |= S_IFREG; 1382bad8471SEric Van Hensbergen 139dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 140bd238fb4SLatchesar Ionkov if ((mode & P9_DMSETUID) == P9_DMSETUID) 1412bad8471SEric Van Hensbergen res |= S_ISUID; 1422bad8471SEric Van Hensbergen 143bd238fb4SLatchesar Ionkov if ((mode & P9_DMSETGID) == P9_DMSETGID) 1442bad8471SEric Van Hensbergen res |= S_ISGID; 145d199d652SAnthony Liguori 146d199d652SAnthony Liguori if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 147d199d652SAnthony Liguori res |= S_ISVTX; 1482bad8471SEric Van Hensbergen } 1492bad8471SEric Van Hensbergen return res; 1502bad8471SEric Van Hensbergen } 1512bad8471SEric Van Hensbergen 152ee443996SEric Van Hensbergen /** 153ee443996SEric Van Hensbergen * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 154ee443996SEric Van Hensbergen * @uflags: flags to convert 1552e4bef41SEric Van Hensbergen * @extended: if .u extensions are active 156ee443996SEric Van Hensbergen */ 157ee443996SEric Van Hensbergen 1582e4bef41SEric Van Hensbergen int v9fs_uflags2omode(int uflags, int extended) 1596a3124a3SLatchesar Ionkov { 1606a3124a3SLatchesar Ionkov int ret; 1616a3124a3SLatchesar Ionkov 1626a3124a3SLatchesar Ionkov ret = 0; 1636a3124a3SLatchesar Ionkov switch (uflags&3) { 1646a3124a3SLatchesar Ionkov default: 1656a3124a3SLatchesar Ionkov case O_RDONLY: 166bd238fb4SLatchesar Ionkov ret = P9_OREAD; 1676a3124a3SLatchesar Ionkov break; 1686a3124a3SLatchesar Ionkov 1696a3124a3SLatchesar Ionkov case O_WRONLY: 170bd238fb4SLatchesar Ionkov ret = P9_OWRITE; 1716a3124a3SLatchesar Ionkov break; 1726a3124a3SLatchesar Ionkov 1736a3124a3SLatchesar Ionkov case O_RDWR: 174bd238fb4SLatchesar Ionkov ret = P9_ORDWR; 1756a3124a3SLatchesar Ionkov break; 1766a3124a3SLatchesar Ionkov } 1776a3124a3SLatchesar Ionkov 1786a3124a3SLatchesar Ionkov if (uflags & O_TRUNC) 179bd238fb4SLatchesar Ionkov ret |= P9_OTRUNC; 1806a3124a3SLatchesar Ionkov 1812e4bef41SEric Van Hensbergen if (extended) { 1822e4bef41SEric Van Hensbergen if (uflags & O_EXCL) 1832e4bef41SEric Van Hensbergen ret |= P9_OEXCL; 1842e4bef41SEric Van Hensbergen 1856a3124a3SLatchesar Ionkov if (uflags & O_APPEND) 186bd238fb4SLatchesar Ionkov ret |= P9_OAPPEND; 1872e4bef41SEric Van Hensbergen } 1886a3124a3SLatchesar Ionkov 1896a3124a3SLatchesar Ionkov return ret; 1906a3124a3SLatchesar Ionkov } 1916a3124a3SLatchesar Ionkov 1922bad8471SEric Van Hensbergen /** 193531b1094SLatchesar Ionkov * v9fs_blank_wstat - helper function to setup a 9P stat structure 194531b1094SLatchesar Ionkov * @wstat: structure to initialize 1952bad8471SEric Van Hensbergen * 1962bad8471SEric Van Hensbergen */ 1972bad8471SEric Van Hensbergen 1987a4439c4SM. Mohan Kumar void 199bd238fb4SLatchesar Ionkov v9fs_blank_wstat(struct p9_wstat *wstat) 2002bad8471SEric Van Hensbergen { 201531b1094SLatchesar Ionkov wstat->type = ~0; 202531b1094SLatchesar Ionkov wstat->dev = ~0; 203531b1094SLatchesar Ionkov wstat->qid.type = ~0; 204531b1094SLatchesar Ionkov wstat->qid.version = ~0; 205531b1094SLatchesar Ionkov *((long long *)&wstat->qid.path) = ~0; 206531b1094SLatchesar Ionkov wstat->mode = ~0; 207531b1094SLatchesar Ionkov wstat->atime = ~0; 208531b1094SLatchesar Ionkov wstat->mtime = ~0; 209531b1094SLatchesar Ionkov wstat->length = ~0; 210531b1094SLatchesar Ionkov wstat->name = NULL; 211531b1094SLatchesar Ionkov wstat->uid = NULL; 212531b1094SLatchesar Ionkov wstat->gid = NULL; 213531b1094SLatchesar Ionkov wstat->muid = NULL; 214531b1094SLatchesar Ionkov wstat->n_uid = ~0; 215531b1094SLatchesar Ionkov wstat->n_gid = ~0; 216531b1094SLatchesar Ionkov wstat->n_muid = ~0; 217531b1094SLatchesar Ionkov wstat->extension = NULL; 2182bad8471SEric Van Hensbergen } 2192bad8471SEric Van Hensbergen 22060e78d2cSAbhishek Kulkarni /** 22160e78d2cSAbhishek Kulkarni * v9fs_alloc_inode - helper function to allocate an inode 22260e78d2cSAbhishek Kulkarni * 22360e78d2cSAbhishek Kulkarni */ 22460e78d2cSAbhishek Kulkarni struct inode *v9fs_alloc_inode(struct super_block *sb) 22560e78d2cSAbhishek Kulkarni { 226a78ce05dSAneesh Kumar K.V struct v9fs_inode *v9inode; 227a78ce05dSAneesh Kumar K.V v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache, 22860e78d2cSAbhishek Kulkarni GFP_KERNEL); 229a78ce05dSAneesh Kumar K.V if (!v9inode) 23060e78d2cSAbhishek Kulkarni return NULL; 231a78ce05dSAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 232a78ce05dSAneesh Kumar K.V v9inode->fscache = NULL; 233a78ce05dSAneesh Kumar K.V spin_lock_init(&v9inode->fscache_lock); 234a78ce05dSAneesh Kumar K.V #endif 2356b39f6d2SAneesh Kumar K.V v9inode->writeback_fid = NULL; 236b3cbea03SAneesh Kumar K.V v9inode->cache_validity = 0; 2375a7e0a8cSAneesh Kumar K.V mutex_init(&v9inode->v_mutex); 238a78ce05dSAneesh Kumar K.V return &v9inode->vfs_inode; 23960e78d2cSAbhishek Kulkarni } 24060e78d2cSAbhishek Kulkarni 24160e78d2cSAbhishek Kulkarni /** 24260e78d2cSAbhishek Kulkarni * v9fs_destroy_inode - destroy an inode 24360e78d2cSAbhishek Kulkarni * 24460e78d2cSAbhishek Kulkarni */ 24560e78d2cSAbhishek Kulkarni 246fa0d7e3dSNick Piggin static void v9fs_i_callback(struct rcu_head *head) 247fa0d7e3dSNick Piggin { 248fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 249a78ce05dSAneesh Kumar K.V kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 250fa0d7e3dSNick Piggin } 251fa0d7e3dSNick Piggin 25260e78d2cSAbhishek Kulkarni void v9fs_destroy_inode(struct inode *inode) 25360e78d2cSAbhishek Kulkarni { 254fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, v9fs_i_callback); 25560e78d2cSAbhishek Kulkarni } 25660e78d2cSAbhishek Kulkarni 2575ffc0cb3SAneesh Kumar K.V int v9fs_init_inode(struct v9fs_session_info *v9ses, 25845089142SAneesh Kumar K.V struct inode *inode, int mode, dev_t rdev) 2592bad8471SEric Van Hensbergen { 2605ffc0cb3SAneesh Kumar K.V int err = 0; 2612bb54115SAbhishek Kulkarni 262217f206dSDmitry Monakhov inode_init_owner(inode, NULL, mode); 2632bad8471SEric Van Hensbergen inode->i_blocks = 0; 26445089142SAneesh Kumar K.V inode->i_rdev = rdev; 2652bad8471SEric Van Hensbergen inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 266147b31cfSEric Van Hensbergen inode->i_mapping->a_ops = &v9fs_addr_operations; 2672bad8471SEric Van Hensbergen 2682bad8471SEric Van Hensbergen switch (mode & S_IFMT) { 2692bad8471SEric Van Hensbergen case S_IFIFO: 2702bad8471SEric Van Hensbergen case S_IFBLK: 2712bad8471SEric Van Hensbergen case S_IFCHR: 2722bad8471SEric Van Hensbergen case S_IFSOCK: 2734b43516aSM. Mohan Kumar if (v9fs_proto_dotl(v9ses)) { 2744b43516aSM. Mohan Kumar inode->i_op = &v9fs_file_inode_operations_dotl; 2754b43516aSM. Mohan Kumar } else if (v9fs_proto_dotu(v9ses)) { 2764b43516aSM. Mohan Kumar inode->i_op = &v9fs_file_inode_operations; 2774b43516aSM. Mohan Kumar } else { 278bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 279bd238fb4SLatchesar Ionkov "special files without extended mode\n"); 2802bb54115SAbhishek Kulkarni err = -EINVAL; 2812bb54115SAbhishek Kulkarni goto error; 282b501611aSEric Van Hensbergen } 2832bb54115SAbhishek Kulkarni init_special_inode(inode, inode->i_mode, inode->i_rdev); 2845d58bec5SEric Van Hensbergen break; 2852bad8471SEric Van Hensbergen case S_IFREG: 2869b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 2879b6533c9SSripathi Kodi inode->i_op = &v9fs_file_inode_operations_dotl; 28829236f4eSAneesh Kumar K.V if (v9ses->cache) 28929236f4eSAneesh Kumar K.V inode->i_fop = 29029236f4eSAneesh Kumar K.V &v9fs_cached_file_operations_dotl; 29129236f4eSAneesh Kumar K.V else 2929b6533c9SSripathi Kodi inode->i_fop = &v9fs_file_operations_dotl; 2939b6533c9SSripathi Kodi } else { 2942bad8471SEric Van Hensbergen inode->i_op = &v9fs_file_inode_operations; 29529236f4eSAneesh Kumar K.V if (v9ses->cache) 29629236f4eSAneesh Kumar K.V inode->i_fop = &v9fs_cached_file_operations; 29729236f4eSAneesh Kumar K.V else 2982bad8471SEric Van Hensbergen inode->i_fop = &v9fs_file_operations; 2999b6533c9SSripathi Kodi } 3009b6533c9SSripathi Kodi 3012bad8471SEric Van Hensbergen break; 302b501611aSEric Van Hensbergen case S_IFLNK: 3039b6533c9SSripathi Kodi if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 3049b6533c9SSripathi Kodi P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " 3059b6533c9SSripathi Kodi "legacy protocol.\n"); 3062bb54115SAbhishek Kulkarni err = -EINVAL; 3072bb54115SAbhishek Kulkarni goto error; 308b501611aSEric Van Hensbergen } 3099b6533c9SSripathi Kodi 3109b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3119b6533c9SSripathi Kodi inode->i_op = &v9fs_symlink_inode_operations_dotl; 3129b6533c9SSripathi Kodi else 313b501611aSEric Van Hensbergen inode->i_op = &v9fs_symlink_inode_operations; 3149b6533c9SSripathi Kodi 315b501611aSEric Van Hensbergen break; 3162bad8471SEric Van Hensbergen case S_IFDIR: 317d8c76e6fSDave Hansen inc_nlink(inode); 3189b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3199b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotl; 3209b6533c9SSripathi Kodi else if (v9fs_proto_dotu(v9ses)) 3219b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotu; 322b501611aSEric Van Hensbergen else 3232bad8471SEric Van Hensbergen inode->i_op = &v9fs_dir_inode_operations; 3249b6533c9SSripathi Kodi 3259b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3269b6533c9SSripathi Kodi inode->i_fop = &v9fs_dir_operations_dotl; 3279b6533c9SSripathi Kodi else 3282bad8471SEric Van Hensbergen inode->i_fop = &v9fs_dir_operations; 3299b6533c9SSripathi Kodi 3302bad8471SEric Van Hensbergen break; 3312bad8471SEric Van Hensbergen default: 3322bb54115SAbhishek Kulkarni P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 3332bad8471SEric Van Hensbergen mode, mode & S_IFMT); 3342bb54115SAbhishek Kulkarni err = -EINVAL; 3352bb54115SAbhishek Kulkarni goto error; 3362bad8471SEric Van Hensbergen } 3372bb54115SAbhishek Kulkarni error: 3385ffc0cb3SAneesh Kumar K.V return err; 3395ffc0cb3SAneesh Kumar K.V 3405ffc0cb3SAneesh Kumar K.V } 3415ffc0cb3SAneesh Kumar K.V 3425ffc0cb3SAneesh Kumar K.V /** 3435ffc0cb3SAneesh Kumar K.V * v9fs_get_inode - helper function to setup an inode 3445ffc0cb3SAneesh Kumar K.V * @sb: superblock 3455ffc0cb3SAneesh Kumar K.V * @mode: mode to setup inode with 3465ffc0cb3SAneesh Kumar K.V * 3475ffc0cb3SAneesh Kumar K.V */ 3485ffc0cb3SAneesh Kumar K.V 34945089142SAneesh Kumar K.V struct inode *v9fs_get_inode(struct super_block *sb, int mode, dev_t rdev) 3505ffc0cb3SAneesh Kumar K.V { 3515ffc0cb3SAneesh Kumar K.V int err; 3525ffc0cb3SAneesh Kumar K.V struct inode *inode; 3535ffc0cb3SAneesh Kumar K.V struct v9fs_session_info *v9ses = sb->s_fs_info; 3545ffc0cb3SAneesh Kumar K.V 3555ffc0cb3SAneesh Kumar K.V P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 3565ffc0cb3SAneesh Kumar K.V 3575ffc0cb3SAneesh Kumar K.V inode = new_inode(sb); 3585ffc0cb3SAneesh Kumar K.V if (!inode) { 3595ffc0cb3SAneesh Kumar K.V P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); 3605ffc0cb3SAneesh Kumar K.V return ERR_PTR(-ENOMEM); 3615ffc0cb3SAneesh Kumar K.V } 36245089142SAneesh Kumar K.V err = v9fs_init_inode(v9ses, inode, mode, rdev); 3635ffc0cb3SAneesh Kumar K.V if (err) { 3642bb54115SAbhishek Kulkarni iput(inode); 3652bb54115SAbhishek Kulkarni return ERR_PTR(err); 3662bad8471SEric Van Hensbergen } 3675ffc0cb3SAneesh Kumar K.V return inode; 3685ffc0cb3SAneesh Kumar K.V } 3692bad8471SEric Van Hensbergen 370bd238fb4SLatchesar Ionkov /* 3716a3124a3SLatchesar Ionkov static struct v9fs_fid* 3726a3124a3SLatchesar Ionkov v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 3736a3124a3SLatchesar Ionkov { 3746a3124a3SLatchesar Ionkov int err; 375736c4b85SMika Kukkonen int nfid; 3766a3124a3SLatchesar Ionkov struct v9fs_fid *ret; 3776a3124a3SLatchesar Ionkov struct v9fs_fcall *fcall; 3780b8dd177SLatchesar Ionkov 3796a3124a3SLatchesar Ionkov nfid = v9fs_get_idpool(&v9ses->fidpool); 3806a3124a3SLatchesar Ionkov if (nfid < 0) { 3810b8dd177SLatchesar Ionkov eprintk(KERN_WARNING, "no free fids available\n"); 382731805b4SLatchesar Ionkov return ERR_PTR(-ENOSPC); 3830b8dd177SLatchesar Ionkov } 3840b8dd177SLatchesar Ionkov 3856a3124a3SLatchesar Ionkov err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 3866a3124a3SLatchesar Ionkov &fcall); 3876a3124a3SLatchesar Ionkov 3886a3124a3SLatchesar Ionkov if (err < 0) { 38941e5a6acSLatchesar Ionkov if (fcall && fcall->id == RWALK) 39041e5a6acSLatchesar Ionkov goto clunk_fid; 39141e5a6acSLatchesar Ionkov 3926a3124a3SLatchesar Ionkov PRINT_FCALL_ERROR("walk error", fcall); 3936a3124a3SLatchesar Ionkov v9fs_put_idpool(nfid, &v9ses->fidpool); 3946a3124a3SLatchesar Ionkov goto error; 3950b8dd177SLatchesar Ionkov } 3966a3124a3SLatchesar Ionkov 3973cf6429aSLatchesar Ionkov kfree(fcall); 3983cf6429aSLatchesar Ionkov fcall = NULL; 3996a3124a3SLatchesar Ionkov ret = v9fs_fid_create(v9ses, nfid); 4006a3124a3SLatchesar Ionkov if (!ret) { 4016a3124a3SLatchesar Ionkov err = -ENOMEM; 4026a3124a3SLatchesar Ionkov goto clunk_fid; 4030b8dd177SLatchesar Ionkov } 4042bad8471SEric Van Hensbergen 4056a3124a3SLatchesar Ionkov err = v9fs_fid_insert(ret, dentry); 4066a3124a3SLatchesar Ionkov if (err < 0) { 4076a3124a3SLatchesar Ionkov v9fs_fid_destroy(ret); 4086a3124a3SLatchesar Ionkov goto clunk_fid; 4096a3124a3SLatchesar Ionkov } 4102bad8471SEric Van Hensbergen 4116a3124a3SLatchesar Ionkov return ret; 4126a3124a3SLatchesar Ionkov 4136a3124a3SLatchesar Ionkov clunk_fid: 4146a3124a3SLatchesar Ionkov v9fs_t_clunk(v9ses, nfid); 4156a3124a3SLatchesar Ionkov 4166a3124a3SLatchesar Ionkov error: 4176a3124a3SLatchesar Ionkov kfree(fcall); 4186a3124a3SLatchesar Ionkov return ERR_PTR(err); 4196a3124a3SLatchesar Ionkov } 420bd238fb4SLatchesar Ionkov */ 4216a3124a3SLatchesar Ionkov 42260e78d2cSAbhishek Kulkarni 42360e78d2cSAbhishek Kulkarni /** 42460e78d2cSAbhishek Kulkarni * v9fs_clear_inode - release an inode 42560e78d2cSAbhishek Kulkarni * @inode: inode to release 42660e78d2cSAbhishek Kulkarni * 42760e78d2cSAbhishek Kulkarni */ 428b57922d9SAl Viro void v9fs_evict_inode(struct inode *inode) 42960e78d2cSAbhishek Kulkarni { 4306b39f6d2SAneesh Kumar K.V struct v9fs_inode *v9inode = V9FS_I(inode); 4316b39f6d2SAneesh Kumar K.V 432b57922d9SAl Viro truncate_inode_pages(inode->i_mapping, 0); 433b57922d9SAl Viro end_writeback(inode); 43460e78d2cSAbhishek Kulkarni filemap_fdatawrite(inode->i_mapping); 43560e78d2cSAbhishek Kulkarni 43660e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 43760e78d2cSAbhishek Kulkarni v9fs_cache_inode_put_cookie(inode); 43860e78d2cSAbhishek Kulkarni #endif 4396b39f6d2SAneesh Kumar K.V /* clunk the fid stashed in writeback_fid */ 4406b39f6d2SAneesh Kumar K.V if (v9inode->writeback_fid) { 4416b39f6d2SAneesh Kumar K.V p9_client_clunk(v9inode->writeback_fid); 4426b39f6d2SAneesh Kumar K.V v9inode->writeback_fid = NULL; 4433cf387d7SAneesh Kumar K.V } 44460e78d2cSAbhishek Kulkarni } 44560e78d2cSAbhishek Kulkarni 446fd2421f5SAneesh Kumar K.V static int v9fs_test_inode(struct inode *inode, void *data) 447fd2421f5SAneesh Kumar K.V { 448fd2421f5SAneesh Kumar K.V int umode; 44945089142SAneesh Kumar K.V dev_t rdev; 450fd2421f5SAneesh Kumar K.V struct v9fs_inode *v9inode = V9FS_I(inode); 451fd2421f5SAneesh Kumar K.V struct p9_wstat *st = (struct p9_wstat *)data; 452fd2421f5SAneesh Kumar K.V struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 453fd2421f5SAneesh Kumar K.V 45445089142SAneesh Kumar K.V umode = p9mode2unixmode(v9ses, st, &rdev); 455fd2421f5SAneesh Kumar K.V /* don't match inode of different type */ 456fd2421f5SAneesh Kumar K.V if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 457fd2421f5SAneesh Kumar K.V return 0; 458fd2421f5SAneesh Kumar K.V 459fd2421f5SAneesh Kumar K.V /* compare qid details */ 460fd2421f5SAneesh Kumar K.V if (memcmp(&v9inode->qid.version, 461fd2421f5SAneesh Kumar K.V &st->qid.version, sizeof(v9inode->qid.version))) 462fd2421f5SAneesh Kumar K.V return 0; 463fd2421f5SAneesh Kumar K.V 464fd2421f5SAneesh Kumar K.V if (v9inode->qid.type != st->qid.type) 465fd2421f5SAneesh Kumar K.V return 0; 466fd2421f5SAneesh Kumar K.V return 1; 467fd2421f5SAneesh Kumar K.V } 468fd2421f5SAneesh Kumar K.V 469ed80fcfaSAneesh Kumar K.V static int v9fs_test_new_inode(struct inode *inode, void *data) 470ed80fcfaSAneesh Kumar K.V { 471ed80fcfaSAneesh Kumar K.V return 0; 472ed80fcfaSAneesh Kumar K.V } 473ed80fcfaSAneesh Kumar K.V 474fd2421f5SAneesh Kumar K.V static int v9fs_set_inode(struct inode *inode, void *data) 475fd2421f5SAneesh Kumar K.V { 476fd2421f5SAneesh Kumar K.V struct v9fs_inode *v9inode = V9FS_I(inode); 477fd2421f5SAneesh Kumar K.V struct p9_wstat *st = (struct p9_wstat *)data; 478fd2421f5SAneesh Kumar K.V 479fd2421f5SAneesh Kumar K.V memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 480fd2421f5SAneesh Kumar K.V return 0; 481fd2421f5SAneesh Kumar K.V } 482fd2421f5SAneesh Kumar K.V 4835ffc0cb3SAneesh Kumar K.V static struct inode *v9fs_qid_iget(struct super_block *sb, 4845ffc0cb3SAneesh Kumar K.V struct p9_qid *qid, 485ed80fcfaSAneesh Kumar K.V struct p9_wstat *st, 486ed80fcfaSAneesh Kumar K.V int new) 4875ffc0cb3SAneesh Kumar K.V { 48845089142SAneesh Kumar K.V dev_t rdev; 4895ffc0cb3SAneesh Kumar K.V int retval, umode; 4905ffc0cb3SAneesh Kumar K.V unsigned long i_ino; 4915ffc0cb3SAneesh Kumar K.V struct inode *inode; 4925ffc0cb3SAneesh Kumar K.V struct v9fs_session_info *v9ses = sb->s_fs_info; 493ed80fcfaSAneesh Kumar K.V int (*test)(struct inode *, void *); 494ed80fcfaSAneesh Kumar K.V 495ed80fcfaSAneesh Kumar K.V if (new) 496ed80fcfaSAneesh Kumar K.V test = v9fs_test_new_inode; 497ed80fcfaSAneesh Kumar K.V else 498ed80fcfaSAneesh Kumar K.V test = v9fs_test_inode; 4995ffc0cb3SAneesh Kumar K.V 5005ffc0cb3SAneesh Kumar K.V i_ino = v9fs_qid2ino(qid); 501ed80fcfaSAneesh Kumar K.V inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 5025ffc0cb3SAneesh Kumar K.V if (!inode) 5035ffc0cb3SAneesh Kumar K.V return ERR_PTR(-ENOMEM); 5045ffc0cb3SAneesh Kumar K.V if (!(inode->i_state & I_NEW)) 5055ffc0cb3SAneesh Kumar K.V return inode; 5065ffc0cb3SAneesh Kumar K.V /* 5075ffc0cb3SAneesh Kumar K.V * initialize the inode with the stat info 5085ffc0cb3SAneesh Kumar K.V * FIXME!! we may need support for stale inodes 5095ffc0cb3SAneesh Kumar K.V * later. 5105ffc0cb3SAneesh Kumar K.V */ 511fd2421f5SAneesh Kumar K.V inode->i_ino = i_ino; 51245089142SAneesh Kumar K.V umode = p9mode2unixmode(v9ses, st, &rdev); 51345089142SAneesh Kumar K.V retval = v9fs_init_inode(v9ses, inode, umode, rdev); 5145ffc0cb3SAneesh Kumar K.V if (retval) 5155ffc0cb3SAneesh Kumar K.V goto error; 5165ffc0cb3SAneesh Kumar K.V 5175ffc0cb3SAneesh Kumar K.V v9fs_stat2inode(st, inode, sb); 5185ffc0cb3SAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 5195ffc0cb3SAneesh Kumar K.V v9fs_cache_inode_get_cookie(inode); 5205ffc0cb3SAneesh Kumar K.V #endif 5215ffc0cb3SAneesh Kumar K.V unlock_new_inode(inode); 5225ffc0cb3SAneesh Kumar K.V return inode; 5235ffc0cb3SAneesh Kumar K.V error: 5245ffc0cb3SAneesh Kumar K.V unlock_new_inode(inode); 5255ffc0cb3SAneesh Kumar K.V iput(inode); 5265ffc0cb3SAneesh Kumar K.V return ERR_PTR(retval); 5275ffc0cb3SAneesh Kumar K.V 5285ffc0cb3SAneesh Kumar K.V } 5295ffc0cb3SAneesh Kumar K.V 53053c06f4eSAneesh Kumar K.V struct inode * 531a78ce05dSAneesh Kumar K.V v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 532ed80fcfaSAneesh Kumar K.V struct super_block *sb, int new) 5336a3124a3SLatchesar Ionkov { 53451a87c55SEric Van Hensbergen struct p9_wstat *st; 5355ffc0cb3SAneesh Kumar K.V struct inode *inode = NULL; 5366a3124a3SLatchesar Ionkov 537bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 53802bc3567SAbhishek Kulkarni if (IS_ERR(st)) 53902bc3567SAbhishek Kulkarni return ERR_CAST(st); 5402bad8471SEric Van Hensbergen 541ed80fcfaSAneesh Kumar K.V inode = v9fs_qid_iget(sb, &st->qid, st, new); 54202bc3567SAbhishek Kulkarni p9stat_free(st); 543bd238fb4SLatchesar Ionkov kfree(st); 5445ffc0cb3SAneesh Kumar K.V return inode; 5452bad8471SEric Van Hensbergen } 5462bad8471SEric Van Hensbergen 5472bad8471SEric Van Hensbergen /** 548f88657ceSAneesh Kumar K.V * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 549f88657ceSAneesh Kumar K.V * plan 9 AT flag. 550f88657ceSAneesh Kumar K.V * @flags: flags to convert 551f88657ceSAneesh Kumar K.V */ 552f88657ceSAneesh Kumar K.V static int v9fs_at_to_dotl_flags(int flags) 553f88657ceSAneesh Kumar K.V { 554f88657ceSAneesh Kumar K.V int rflags = 0; 555f88657ceSAneesh Kumar K.V if (flags & AT_REMOVEDIR) 556f88657ceSAneesh Kumar K.V rflags |= P9_DOTL_AT_REMOVEDIR; 557f88657ceSAneesh Kumar K.V return rflags; 558f88657ceSAneesh Kumar K.V } 559f88657ceSAneesh Kumar K.V 560f88657ceSAneesh Kumar K.V /** 5612bad8471SEric Van Hensbergen * v9fs_remove - helper function to remove files and directories 56273c592b9SEric Van Hensbergen * @dir: directory inode that is being deleted 56348e370ffSAneesh Kumar K.V * @dentry: dentry that is being deleted 56473c592b9SEric Van Hensbergen * @rmdir: removing a directory 5652bad8471SEric Van Hensbergen * 5662bad8471SEric Van Hensbergen */ 5672bad8471SEric Van Hensbergen 56848e370ffSAneesh Kumar K.V static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 5692bad8471SEric Van Hensbergen { 57048e370ffSAneesh Kumar K.V struct inode *inode; 57148e370ffSAneesh Kumar K.V int retval = -EOPNOTSUPP; 57248e370ffSAneesh Kumar K.V struct p9_fid *v9fid, *dfid; 57348e370ffSAneesh Kumar K.V struct v9fs_session_info *v9ses; 5742bad8471SEric Van Hensbergen 57548e370ffSAneesh Kumar K.V P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 57648e370ffSAneesh Kumar K.V dir, dentry, flags); 5772bad8471SEric Van Hensbergen 57848e370ffSAneesh Kumar K.V v9ses = v9fs_inode2v9ses(dir); 57948e370ffSAneesh Kumar K.V inode = dentry->d_inode; 58048e370ffSAneesh Kumar K.V dfid = v9fs_fid_lookup(dentry->d_parent); 58148e370ffSAneesh Kumar K.V if (IS_ERR(dfid)) { 58248e370ffSAneesh Kumar K.V retval = PTR_ERR(dfid); 58348e370ffSAneesh Kumar K.V P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 58448e370ffSAneesh Kumar K.V return retval; 58548e370ffSAneesh Kumar K.V } 58648e370ffSAneesh Kumar K.V if (v9fs_proto_dotl(v9ses)) 587f88657ceSAneesh Kumar K.V retval = p9_client_unlinkat(dfid, dentry->d_name.name, 588f88657ceSAneesh Kumar K.V v9fs_at_to_dotl_flags(flags)); 58948e370ffSAneesh Kumar K.V if (retval == -EOPNOTSUPP) { 59048e370ffSAneesh Kumar K.V /* Try the one based on path */ 59148e370ffSAneesh Kumar K.V v9fid = v9fs_fid_clone(dentry); 592da977b2cSEric Van Hensbergen if (IS_ERR(v9fid)) 593da977b2cSEric Van Hensbergen return PTR_ERR(v9fid); 594d994f405SAneesh Kumar K.V retval = p9_client_remove(v9fid); 59548e370ffSAneesh Kumar K.V } 596b271ec47SAneesh Kumar K.V if (!retval) { 597b271ec47SAneesh Kumar K.V /* 598b271ec47SAneesh Kumar K.V * directories on unlink should have zero 599b271ec47SAneesh Kumar K.V * link count 600b271ec47SAneesh Kumar K.V */ 60148e370ffSAneesh Kumar K.V if (flags & AT_REMOVEDIR) { 60248e370ffSAneesh Kumar K.V clear_nlink(inode); 603b271ec47SAneesh Kumar K.V drop_nlink(dir); 604b271ec47SAneesh Kumar K.V } else 60548e370ffSAneesh Kumar K.V drop_nlink(inode); 606d28c61f0SAneesh Kumar K.V 60748e370ffSAneesh Kumar K.V v9fs_invalidate_inode_attr(inode); 608d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(dir); 609b271ec47SAneesh Kumar K.V } 610d994f405SAneesh Kumar K.V return retval; 6112bad8471SEric Van Hensbergen } 6122bad8471SEric Van Hensbergen 613bd238fb4SLatchesar Ionkov /** 614bd238fb4SLatchesar Ionkov * v9fs_create - Create a file 615ee443996SEric Van Hensbergen * @v9ses: session information 616ee443996SEric Van Hensbergen * @dir: directory that dentry is being created in 617bd238fb4SLatchesar Ionkov * @dentry: dentry that is being created 6180e15597eSAbhishek Kulkarni * @extension: 9p2000.u extension string to support devices, etc. 619bd238fb4SLatchesar Ionkov * @perm: create permissions 620bd238fb4SLatchesar Ionkov * @mode: open mode 621bd238fb4SLatchesar Ionkov * 622bd238fb4SLatchesar Ionkov */ 623bd238fb4SLatchesar Ionkov static struct p9_fid * 624bd238fb4SLatchesar Ionkov v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 625bd238fb4SLatchesar Ionkov struct dentry *dentry, char *extension, u32 perm, u8 mode) 626bd238fb4SLatchesar Ionkov { 627bd238fb4SLatchesar Ionkov int err; 628bd238fb4SLatchesar Ionkov char *name; 629bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *ofid, *fid; 630bd238fb4SLatchesar Ionkov struct inode *inode; 631bd238fb4SLatchesar Ionkov 63251a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 63351a87c55SEric Van Hensbergen 634bd238fb4SLatchesar Ionkov err = 0; 635bd238fb4SLatchesar Ionkov ofid = NULL; 636bd238fb4SLatchesar Ionkov fid = NULL; 637bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 6386d27e64dSVenkateswararao Jujjuri dfid = v9fs_fid_lookup(dentry->d_parent); 639bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) { 640bd238fb4SLatchesar Ionkov err = PTR_ERR(dfid); 6416d27e64dSVenkateswararao Jujjuri P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 6426d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 643bd238fb4SLatchesar Ionkov } 644bd238fb4SLatchesar Ionkov 645bd238fb4SLatchesar Ionkov /* clone a fid to use for creation */ 646bd238fb4SLatchesar Ionkov ofid = p9_client_walk(dfid, 0, NULL, 1); 647bd238fb4SLatchesar Ionkov if (IS_ERR(ofid)) { 648bd238fb4SLatchesar Ionkov err = PTR_ERR(ofid); 64951a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 6506d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 651bd238fb4SLatchesar Ionkov } 652bd238fb4SLatchesar Ionkov 653bd238fb4SLatchesar Ionkov err = p9_client_fcreate(ofid, name, perm, mode, extension); 65451a87c55SEric Van Hensbergen if (err < 0) { 65551a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 656bd238fb4SLatchesar Ionkov goto error; 65751a87c55SEric Van Hensbergen } 658bd238fb4SLatchesar Ionkov 659bd238fb4SLatchesar Ionkov /* now walk from the parent so we can get unopened fid */ 6606d27e64dSVenkateswararao Jujjuri fid = p9_client_walk(dfid, 1, &name, 1); 661bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 662bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 66351a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 664bd238fb4SLatchesar Ionkov fid = NULL; 665bd238fb4SLatchesar Ionkov goto error; 6666d27e64dSVenkateswararao Jujjuri } 667bd238fb4SLatchesar Ionkov 668bd238fb4SLatchesar Ionkov /* instantiate inode and assign the unopened fid to the dentry */ 669ed80fcfaSAneesh Kumar K.V inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 670bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 671bd238fb4SLatchesar Ionkov err = PTR_ERR(inode); 67251a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); 673bd238fb4SLatchesar Ionkov goto error; 674bd238fb4SLatchesar Ionkov } 67550fb6d2bSAbhishek Kulkarni err = v9fs_fid_add(dentry, fid); 67650fb6d2bSAbhishek Kulkarni if (err < 0) 67750fb6d2bSAbhishek Kulkarni goto error; 6785441ae5eSAneesh Kumar K.V d_instantiate(dentry, inode); 679bd238fb4SLatchesar Ionkov return ofid; 680bd238fb4SLatchesar Ionkov error: 681bd238fb4SLatchesar Ionkov if (ofid) 682bd238fb4SLatchesar Ionkov p9_client_clunk(ofid); 683bd238fb4SLatchesar Ionkov 684bd238fb4SLatchesar Ionkov if (fid) 685bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 686bd238fb4SLatchesar Ionkov 687bd238fb4SLatchesar Ionkov return ERR_PTR(err); 688bd238fb4SLatchesar Ionkov } 689bd238fb4SLatchesar Ionkov 6902bad8471SEric Van Hensbergen /** 6912bad8471SEric Van Hensbergen * v9fs_vfs_create - VFS hook to create files 692ee443996SEric Van Hensbergen * @dir: directory inode that is being created 6932bad8471SEric Van Hensbergen * @dentry: dentry that is being deleted 6946a3124a3SLatchesar Ionkov * @mode: create permissions 6952bad8471SEric Van Hensbergen * @nd: path information 6962bad8471SEric Van Hensbergen * 6972bad8471SEric Van Hensbergen */ 6982bad8471SEric Van Hensbergen 6992bad8471SEric Van Hensbergen static int 7004acdaf27SAl Viro v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 7012bad8471SEric Van Hensbergen struct nameidata *nd) 7022bad8471SEric Van Hensbergen { 7036a3124a3SLatchesar Ionkov int err; 704bd238fb4SLatchesar Ionkov u32 perm; 7056a3124a3SLatchesar Ionkov int flags; 7066b39f6d2SAneesh Kumar K.V struct file *filp; 7076b39f6d2SAneesh Kumar K.V struct v9fs_inode *v9inode; 7086a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 7093cf387d7SAneesh Kumar K.V struct p9_fid *fid, *inode_fid; 7106a3124a3SLatchesar Ionkov 711bd238fb4SLatchesar Ionkov err = 0; 712bd238fb4SLatchesar Ionkov fid = NULL; 7136a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 714da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 715dd7dd556SAl Viro if (nd) 7168a5e929dSAl Viro flags = nd->intent.open.flags; 7176a3124a3SLatchesar Ionkov else 7186a3124a3SLatchesar Ionkov flags = O_RDWR; 7196a3124a3SLatchesar Ionkov 720bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 721dd6102fbSSripathi Kodi v9fs_uflags2omode(flags, 722dd6102fbSSripathi Kodi v9fs_proto_dotu(v9ses))); 723bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 724bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 725bd238fb4SLatchesar Ionkov fid = NULL; 7266a3124a3SLatchesar Ionkov goto error; 7276a3124a3SLatchesar Ionkov } 7286a3124a3SLatchesar Ionkov 729d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(dir); 730bd238fb4SLatchesar Ionkov /* if we are opening a file, assign the open fid to the file */ 731dd7dd556SAl Viro if (nd) { 7326b39f6d2SAneesh Kumar K.V v9inode = V9FS_I(dentry->d_inode); 7335a7e0a8cSAneesh Kumar K.V mutex_lock(&v9inode->v_mutex); 7347add697aSAneesh Kumar K.V if (v9ses->cache && !v9inode->writeback_fid && 7357add697aSAneesh Kumar K.V ((flags & O_ACCMODE) != O_RDONLY)) { 7363cf387d7SAneesh Kumar K.V /* 7376b39f6d2SAneesh Kumar K.V * clone a fid and add it to writeback_fid 7383cf387d7SAneesh Kumar K.V * we do it during open time instead of 7393cf387d7SAneesh Kumar K.V * page dirty time via write_begin/page_mkwrite 7403cf387d7SAneesh Kumar K.V * because we want write after unlink usecase 7413cf387d7SAneesh Kumar K.V * to work. 7423cf387d7SAneesh Kumar K.V */ 7433cf387d7SAneesh Kumar K.V inode_fid = v9fs_writeback_fid(dentry); 7443cf387d7SAneesh Kumar K.V if (IS_ERR(inode_fid)) { 7453cf387d7SAneesh Kumar K.V err = PTR_ERR(inode_fid); 7465a7e0a8cSAneesh Kumar K.V mutex_unlock(&v9inode->v_mutex); 7473cf387d7SAneesh Kumar K.V goto error; 7483cf387d7SAneesh Kumar K.V } 7496b39f6d2SAneesh Kumar K.V v9inode->writeback_fid = (void *) inode_fid; 7503cf387d7SAneesh Kumar K.V } 7515a7e0a8cSAneesh Kumar K.V mutex_unlock(&v9inode->v_mutex); 752877cb3d4SAneesh Kumar K.V filp = lookup_instantiate_filp(nd, dentry, generic_file_open); 7536a3124a3SLatchesar Ionkov if (IS_ERR(filp)) { 754bd238fb4SLatchesar Ionkov err = PTR_ERR(filp); 755bd238fb4SLatchesar Ionkov goto error; 7566a3124a3SLatchesar Ionkov } 7576a3124a3SLatchesar Ionkov 758bd238fb4SLatchesar Ionkov filp->private_data = fid; 75946848de0SAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 76046848de0SAneesh Kumar K.V if (v9ses->cache) 76146848de0SAneesh Kumar K.V v9fs_cache_inode_set_cookie(dentry->d_inode, filp); 76246848de0SAneesh Kumar K.V #endif 763bd238fb4SLatchesar Ionkov } else 764bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 7656a3124a3SLatchesar Ionkov 7666a3124a3SLatchesar Ionkov return 0; 7676a3124a3SLatchesar Ionkov 7686a3124a3SLatchesar Ionkov error: 769bd238fb4SLatchesar Ionkov if (fid) 770bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 7716a3124a3SLatchesar Ionkov 7726a3124a3SLatchesar Ionkov return err; 7732bad8471SEric Van Hensbergen } 7742bad8471SEric Van Hensbergen 7752bad8471SEric Van Hensbergen /** 7762bad8471SEric Van Hensbergen * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 777ee443996SEric Van Hensbergen * @dir: inode that is being unlinked 7782bad8471SEric Van Hensbergen * @dentry: dentry that is being unlinked 7792bad8471SEric Van Hensbergen * @mode: mode for new directory 7802bad8471SEric Van Hensbergen * 7812bad8471SEric Van Hensbergen */ 7822bad8471SEric Van Hensbergen 78318bb1db3SAl Viro static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 7842bad8471SEric Van Hensbergen { 7856a3124a3SLatchesar Ionkov int err; 786bd238fb4SLatchesar Ionkov u32 perm; 787bd238fb4SLatchesar Ionkov struct p9_fid *fid; 788d28c61f0SAneesh Kumar K.V struct v9fs_session_info *v9ses; 7896a3124a3SLatchesar Ionkov 790bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 791bd238fb4SLatchesar Ionkov err = 0; 7926a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 7936a3124a3SLatchesar Ionkov perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 794bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 795bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 796bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 797bd238fb4SLatchesar Ionkov fid = NULL; 798d28c61f0SAneesh Kumar K.V } else { 799b271ec47SAneesh Kumar K.V inc_nlink(dir); 800d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(dir); 801d28c61f0SAneesh Kumar K.V } 8026a3124a3SLatchesar Ionkov 803bd238fb4SLatchesar Ionkov if (fid) 804bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 8056a3124a3SLatchesar Ionkov 8066a3124a3SLatchesar Ionkov return err; 8072bad8471SEric Van Hensbergen } 8082bad8471SEric Van Hensbergen 8092bad8471SEric Van Hensbergen /** 8102bad8471SEric Van Hensbergen * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 8112bad8471SEric Van Hensbergen * @dir: inode that is being walked from 8122bad8471SEric Van Hensbergen * @dentry: dentry that is being walked to? 8132bad8471SEric Van Hensbergen * @nameidata: path data 8142bad8471SEric Van Hensbergen * 8152bad8471SEric Van Hensbergen */ 8162bad8471SEric Van Hensbergen 81753c06f4eSAneesh Kumar K.V struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 8182bad8471SEric Van Hensbergen struct nameidata *nameidata) 8192bad8471SEric Van Hensbergen { 82073f50717SAneesh Kumar K.V struct dentry *res; 8212bad8471SEric Van Hensbergen struct super_block *sb; 8222bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses; 823bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *fid; 8242bad8471SEric Van Hensbergen struct inode *inode; 825bd238fb4SLatchesar Ionkov char *name; 8262bad8471SEric Van Hensbergen int result = 0; 8272bad8471SEric Van Hensbergen 828bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 829731805b4SLatchesar Ionkov dir, dentry->d_name.name, dentry, nameidata); 8302bad8471SEric Van Hensbergen 83111e9b49bSSripathi Kodi if (dentry->d_name.len > NAME_MAX) 83211e9b49bSSripathi Kodi return ERR_PTR(-ENAMETOOLONG); 83311e9b49bSSripathi Kodi 8342bad8471SEric Van Hensbergen sb = dir->i_sb; 8352bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(dir); 836a534c8d1SAneesh Kumar K.V /* We can walk d_parent because we hold the dir->i_mutex */ 837bd238fb4SLatchesar Ionkov dfid = v9fs_fid_lookup(dentry->d_parent); 838bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) 839e231c2eeSDavid Howells return ERR_CAST(dfid); 8402bad8471SEric Van Hensbergen 841bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 842bd238fb4SLatchesar Ionkov fid = p9_client_walk(dfid, 1, &name, 1); 843bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 844bd238fb4SLatchesar Ionkov result = PTR_ERR(fid); 8452bad8471SEric Van Hensbergen if (result == -ENOENT) { 84685e0df24SAneesh Kumar K.V inode = NULL; 84785e0df24SAneesh Kumar K.V goto inst_out; 8482bad8471SEric Van Hensbergen } 8492bad8471SEric Van Hensbergen 850bd238fb4SLatchesar Ionkov return ERR_PTR(result); 8512bad8471SEric Van Hensbergen } 85273f50717SAneesh Kumar K.V /* 85373f50717SAneesh Kumar K.V * Make sure we don't use a wrong inode due to parallel 85473f50717SAneesh Kumar K.V * unlink. For cached mode create calls request for new 85573f50717SAneesh Kumar K.V * inode. But with cache disabled, lookup should do this. 85673f50717SAneesh Kumar K.V */ 85773f50717SAneesh Kumar K.V if (v9ses->cache) 858a78ce05dSAneesh Kumar K.V inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 85973f50717SAneesh Kumar K.V else 86073f50717SAneesh Kumar K.V inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 861bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 862bd238fb4SLatchesar Ionkov result = PTR_ERR(inode); 863bd238fb4SLatchesar Ionkov inode = NULL; 864bd238fb4SLatchesar Ionkov goto error; 8652bad8471SEric Van Hensbergen } 866bd238fb4SLatchesar Ionkov result = v9fs_fid_add(dentry, fid); 8676a3124a3SLatchesar Ionkov if (result < 0) 8689856af8bSAneesh Kumar K.V goto error_iput; 86985e0df24SAneesh Kumar K.V inst_out: 87073f50717SAneesh Kumar K.V /* 87173f50717SAneesh Kumar K.V * If we had a rename on the server and a parallel lookup 87273f50717SAneesh Kumar K.V * for the new name, then make sure we instantiate with 87373f50717SAneesh Kumar K.V * the new name. ie look up for a/b, while on server somebody 87473f50717SAneesh Kumar K.V * moved b under k and client parallely did a lookup for 87573f50717SAneesh Kumar K.V * k/b. 87673f50717SAneesh Kumar K.V */ 87773f50717SAneesh Kumar K.V res = d_materialise_unique(dentry, inode); 87873f50717SAneesh Kumar K.V if (!IS_ERR(res)) 87973f50717SAneesh Kumar K.V return res; 88073f50717SAneesh Kumar K.V result = PTR_ERR(res); 8819856af8bSAneesh Kumar K.V error_iput: 8829856af8bSAneesh Kumar K.V iput(inode); 883bd238fb4SLatchesar Ionkov error: 884bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 885da977b2cSEric Van Hensbergen 8862bad8471SEric Van Hensbergen return ERR_PTR(result); 8872bad8471SEric Van Hensbergen } 8882bad8471SEric Van Hensbergen 8892bad8471SEric Van Hensbergen /** 8902bad8471SEric Van Hensbergen * v9fs_vfs_unlink - VFS unlink hook to delete an inode 8912bad8471SEric Van Hensbergen * @i: inode that is being unlinked 89273c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 8932bad8471SEric Van Hensbergen * 8942bad8471SEric Van Hensbergen */ 8952bad8471SEric Van Hensbergen 89653c06f4eSAneesh Kumar K.V int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 8972bad8471SEric Van Hensbergen { 8982bad8471SEric Van Hensbergen return v9fs_remove(i, d, 0); 8992bad8471SEric Van Hensbergen } 9002bad8471SEric Van Hensbergen 9012bad8471SEric Van Hensbergen /** 9022bad8471SEric Van Hensbergen * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 9032bad8471SEric Van Hensbergen * @i: inode that is being unlinked 90473c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 9052bad8471SEric Van Hensbergen * 9062bad8471SEric Van Hensbergen */ 9072bad8471SEric Van Hensbergen 90853c06f4eSAneesh Kumar K.V int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 9092bad8471SEric Van Hensbergen { 91048e370ffSAneesh Kumar K.V return v9fs_remove(i, d, AT_REMOVEDIR); 9112bad8471SEric Van Hensbergen } 9122bad8471SEric Van Hensbergen 9132bad8471SEric Van Hensbergen /** 9142bad8471SEric Van Hensbergen * v9fs_vfs_rename - VFS hook to rename an inode 9152bad8471SEric Van Hensbergen * @old_dir: old dir inode 9162bad8471SEric Van Hensbergen * @old_dentry: old dentry 9172bad8471SEric Van Hensbergen * @new_dir: new dir inode 9182bad8471SEric Van Hensbergen * @new_dentry: new dentry 9192bad8471SEric Van Hensbergen * 9202bad8471SEric Van Hensbergen */ 9212bad8471SEric Van Hensbergen 92253c06f4eSAneesh Kumar K.V int 9232bad8471SEric Van Hensbergen v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 9242bad8471SEric Van Hensbergen struct inode *new_dir, struct dentry *new_dentry) 9252bad8471SEric Van Hensbergen { 926d28c61f0SAneesh Kumar K.V int retval; 927bd238fb4SLatchesar Ionkov struct inode *old_inode; 928b271ec47SAneesh Kumar K.V struct inode *new_inode; 929bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 930bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 931bd238fb4SLatchesar Ionkov struct p9_fid *olddirfid; 932bd238fb4SLatchesar Ionkov struct p9_fid *newdirfid; 933bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 9342bad8471SEric Van Hensbergen 935bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 936bd238fb4SLatchesar Ionkov retval = 0; 937bd238fb4SLatchesar Ionkov old_inode = old_dentry->d_inode; 938b271ec47SAneesh Kumar K.V new_inode = new_dentry->d_inode; 939bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(old_inode); 940bd238fb4SLatchesar Ionkov oldfid = v9fs_fid_lookup(old_dentry); 941da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 942da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 943da977b2cSEric Van Hensbergen 944da977b2cSEric Van Hensbergen olddirfid = v9fs_fid_clone(old_dentry->d_parent); 945da977b2cSEric Van Hensbergen if (IS_ERR(olddirfid)) { 946da977b2cSEric Van Hensbergen retval = PTR_ERR(olddirfid); 947bd238fb4SLatchesar Ionkov goto done; 948da977b2cSEric Van Hensbergen } 949da977b2cSEric Van Hensbergen 950da977b2cSEric Van Hensbergen newdirfid = v9fs_fid_clone(new_dentry->d_parent); 951da977b2cSEric Van Hensbergen if (IS_ERR(newdirfid)) { 952da977b2cSEric Van Hensbergen retval = PTR_ERR(newdirfid); 953bd238fb4SLatchesar Ionkov goto clunk_olddir; 9542bad8471SEric Van Hensbergen } 9552bad8471SEric Van Hensbergen 956a534c8d1SAneesh Kumar K.V down_write(&v9ses->rename_sem); 9574681dbdaSSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 9589e8fb38eSAneesh Kumar K.V retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 9599e8fb38eSAneesh Kumar K.V newdirfid, new_dentry->d_name.name); 9609e8fb38eSAneesh Kumar K.V if (retval == -EOPNOTSUPP) 9614681dbdaSSripathi Kodi retval = p9_client_rename(oldfid, newdirfid, 9629e8fb38eSAneesh Kumar K.V new_dentry->d_name.name); 9639e8fb38eSAneesh Kumar K.V if (retval != -EOPNOTSUPP) 9644681dbdaSSripathi Kodi goto clunk_newdir; 9654681dbdaSSripathi Kodi } 966a534c8d1SAneesh Kumar K.V if (old_dentry->d_parent != new_dentry->d_parent) { 967a534c8d1SAneesh Kumar K.V /* 968a534c8d1SAneesh Kumar K.V * 9P .u can only handle file rename in the same directory 969a534c8d1SAneesh Kumar K.V */ 9704681dbdaSSripathi Kodi 971bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 972bd238fb4SLatchesar Ionkov "old dir and new dir are different\n"); 973621997cdSEric Van Hensbergen retval = -EXDEV; 974bd238fb4SLatchesar Ionkov goto clunk_newdir; 9752bad8471SEric Van Hensbergen } 976531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 977ba17674fSLatchesar Ionkov wstat.muid = v9ses->uname; 978531b1094SLatchesar Ionkov wstat.name = (char *) new_dentry->d_name.name; 979bd238fb4SLatchesar Ionkov retval = p9_client_wstat(oldfid, &wstat); 9802bad8471SEric Van Hensbergen 981bd238fb4SLatchesar Ionkov clunk_newdir: 982b271ec47SAneesh Kumar K.V if (!retval) { 983b271ec47SAneesh Kumar K.V if (new_inode) { 984b271ec47SAneesh Kumar K.V if (S_ISDIR(new_inode->i_mode)) 985b271ec47SAneesh Kumar K.V clear_nlink(new_inode); 986b271ec47SAneesh Kumar K.V else 987b271ec47SAneesh Kumar K.V drop_nlink(new_inode); 988b271ec47SAneesh Kumar K.V } 989b271ec47SAneesh Kumar K.V if (S_ISDIR(old_inode->i_mode)) { 990b271ec47SAneesh Kumar K.V if (!new_inode) 991b271ec47SAneesh Kumar K.V inc_nlink(new_dir); 992b271ec47SAneesh Kumar K.V drop_nlink(old_dir); 993b271ec47SAneesh Kumar K.V } 9943bc86de3SAneesh Kumar K.V v9fs_invalidate_inode_attr(old_inode); 995d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(old_dir); 996d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(new_dir); 9973bc86de3SAneesh Kumar K.V 998a534c8d1SAneesh Kumar K.V /* successful rename */ 999a534c8d1SAneesh Kumar K.V d_move(old_dentry, new_dentry); 1000b271ec47SAneesh Kumar K.V } 1001a534c8d1SAneesh Kumar K.V up_write(&v9ses->rename_sem); 100222150c4fSLatchesar Ionkov p9_client_clunk(newdirfid); 10032bad8471SEric Van Hensbergen 1004bd238fb4SLatchesar Ionkov clunk_olddir: 100522150c4fSLatchesar Ionkov p9_client_clunk(olddirfid); 10062bad8471SEric Van Hensbergen 1007bd238fb4SLatchesar Ionkov done: 10082bad8471SEric Van Hensbergen return retval; 10092bad8471SEric Van Hensbergen } 10102bad8471SEric Van Hensbergen 10112bad8471SEric Van Hensbergen /** 1012943ffb58SAdrian Bunk * v9fs_vfs_getattr - retrieve file metadata 1013ee443996SEric Van Hensbergen * @mnt: mount information 1014ee443996SEric Van Hensbergen * @dentry: file to get attributes on 1015ee443996SEric Van Hensbergen * @stat: metadata structure to populate 10162bad8471SEric Van Hensbergen * 10172bad8471SEric Van Hensbergen */ 10182bad8471SEric Van Hensbergen 10192bad8471SEric Van Hensbergen static int 10202bad8471SEric Van Hensbergen v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 10212bad8471SEric Van Hensbergen struct kstat *stat) 10222bad8471SEric Van Hensbergen { 1023bd238fb4SLatchesar Ionkov int err; 1024bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1025bd238fb4SLatchesar Ionkov struct p9_fid *fid; 102651a87c55SEric Van Hensbergen struct p9_wstat *st; 10272bad8471SEric Van Hensbergen 1028bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1029bd238fb4SLatchesar Ionkov err = -EPERM; 103042869c8aSAneesh Kumar K.V v9ses = v9fs_dentry2v9ses(dentry); 1031a1211908SAneesh Kumar K.V if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1032a1211908SAneesh Kumar K.V generic_fillattr(dentry->d_inode, stat); 1033a1211908SAneesh Kumar K.V return 0; 1034a1211908SAneesh Kumar K.V } 1035bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1036da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 1037da977b2cSEric Van Hensbergen return PTR_ERR(fid); 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 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 10442bad8471SEric Van Hensbergen generic_fillattr(dentry->d_inode, stat); 10452bad8471SEric Van Hensbergen 104662b2be59SLatchesar Ionkov p9stat_free(st); 1047bd238fb4SLatchesar Ionkov kfree(st); 1048bd238fb4SLatchesar Ionkov return 0; 10492bad8471SEric Van Hensbergen } 10502bad8471SEric Van Hensbergen 10512bad8471SEric Van Hensbergen /** 10522bad8471SEric Van Hensbergen * v9fs_vfs_setattr - set file metadata 10532bad8471SEric Van Hensbergen * @dentry: file whose metadata to set 10542bad8471SEric Van Hensbergen * @iattr: metadata assignment structure 10552bad8471SEric Van Hensbergen * 10562bad8471SEric Van Hensbergen */ 10572bad8471SEric Van Hensbergen 10582bad8471SEric Van Hensbergen static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 10592bad8471SEric Van Hensbergen { 1060bd238fb4SLatchesar Ionkov int retval; 1061bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1062bd238fb4SLatchesar Ionkov struct p9_fid *fid; 1063bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 10642bad8471SEric Van Hensbergen 1065bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 1066059c138bSAneesh Kumar K.V retval = inode_change_ok(dentry->d_inode, iattr); 1067059c138bSAneesh Kumar K.V if (retval) 1068059c138bSAneesh Kumar K.V return retval; 1069059c138bSAneesh Kumar K.V 1070bd238fb4SLatchesar Ionkov retval = -EPERM; 107142869c8aSAneesh Kumar K.V v9ses = v9fs_dentry2v9ses(dentry); 1072bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1073da977b2cSEric Van Hensbergen if(IS_ERR(fid)) 1074da977b2cSEric Van Hensbergen return PTR_ERR(fid); 10752bad8471SEric Van Hensbergen 1076531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 10772bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MODE) 1078531b1094SLatchesar Ionkov wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 10792bad8471SEric Van Hensbergen 10802bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MTIME) 1081531b1094SLatchesar Ionkov wstat.mtime = iattr->ia_mtime.tv_sec; 10822bad8471SEric Van Hensbergen 10832bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_ATIME) 1084531b1094SLatchesar Ionkov wstat.atime = iattr->ia_atime.tv_sec; 10852bad8471SEric Van Hensbergen 10862bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_SIZE) 1087531b1094SLatchesar Ionkov wstat.length = iattr->ia_size; 10882bad8471SEric Van Hensbergen 1089dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 1090531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_UID) 1091531b1094SLatchesar Ionkov wstat.n_uid = iattr->ia_uid; 10922bad8471SEric Van Hensbergen 1093531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_GID) 1094531b1094SLatchesar Ionkov wstat.n_gid = iattr->ia_gid; 10952bad8471SEric Van Hensbergen } 1096059c138bSAneesh Kumar K.V 10973dc5436aSAneesh Kumar K.V /* Write all dirty data */ 10983dc5436aSAneesh Kumar K.V if (S_ISREG(dentry->d_inode->i_mode)) 10993dc5436aSAneesh Kumar K.V filemap_write_and_wait(dentry->d_inode->i_mapping); 11003dc5436aSAneesh Kumar K.V 1101f10fc50fSAneesh Kumar K.V retval = p9_client_wstat(fid, &wstat); 1102f10fc50fSAneesh Kumar K.V if (retval < 0) 1103f10fc50fSAneesh Kumar K.V return retval; 1104059c138bSAneesh Kumar K.V 1105059c138bSAneesh Kumar K.V if ((iattr->ia_valid & ATTR_SIZE) && 1106059c138bSAneesh Kumar K.V iattr->ia_size != i_size_read(dentry->d_inode)) 1107059c138bSAneesh Kumar K.V truncate_setsize(dentry->d_inode, iattr->ia_size); 1108059c138bSAneesh Kumar K.V 1109f10fc50fSAneesh Kumar K.V v9fs_invalidate_inode_attr(dentry->d_inode); 11101025774cSChristoph Hellwig 11111025774cSChristoph Hellwig setattr_copy(dentry->d_inode, iattr); 11121025774cSChristoph Hellwig mark_inode_dirty(dentry->d_inode); 11131025774cSChristoph Hellwig return 0; 11142bad8471SEric Van Hensbergen } 11152bad8471SEric Van Hensbergen 11162bad8471SEric Van Hensbergen /** 1117531b1094SLatchesar Ionkov * v9fs_stat2inode - populate an inode structure with mistat info 1118531b1094SLatchesar Ionkov * @stat: Plan 9 metadata (mistat) structure 11192bad8471SEric Van Hensbergen * @inode: inode to populate 11202bad8471SEric Van Hensbergen * @sb: superblock of filesystem 11212bad8471SEric Van Hensbergen * 11222bad8471SEric Van Hensbergen */ 11232bad8471SEric Van Hensbergen 11242bad8471SEric Van Hensbergen void 112551a87c55SEric Van Hensbergen v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 11262bad8471SEric Van Hensbergen struct super_block *sb) 11272bad8471SEric Van Hensbergen { 112845089142SAneesh Kumar K.V mode_t mode; 1129531b1094SLatchesar Ionkov char ext[32]; 11305717144aSAneesh Kumar K.V char tag_name[14]; 11315717144aSAneesh Kumar K.V unsigned int i_nlink; 11322bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 1133b3cbea03SAneesh Kumar K.V struct v9fs_inode *v9inode = V9FS_I(inode); 11342bad8471SEric Van Hensbergen 1135bfe86848SMiklos Szeredi set_nlink(inode, 1); 11362bad8471SEric Van Hensbergen 1137531b1094SLatchesar Ionkov inode->i_atime.tv_sec = stat->atime; 1138531b1094SLatchesar Ionkov inode->i_mtime.tv_sec = stat->mtime; 1139531b1094SLatchesar Ionkov inode->i_ctime.tv_sec = stat->mtime; 11402bad8471SEric Van Hensbergen 1141bd32b82dSLatchesar Ionkov inode->i_uid = v9ses->dfltuid; 1142bd32b82dSLatchesar Ionkov inode->i_gid = v9ses->dfltgid; 11432bad8471SEric Van Hensbergen 1144dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 1145531b1094SLatchesar Ionkov inode->i_uid = stat->n_uid; 1146531b1094SLatchesar Ionkov inode->i_gid = stat->n_gid; 1147531b1094SLatchesar Ionkov } 11485717144aSAneesh Kumar K.V if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 11495717144aSAneesh Kumar K.V if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 11505717144aSAneesh Kumar K.V /* 11515717144aSAneesh Kumar K.V * Hadlink support got added later to 11525717144aSAneesh Kumar K.V * to the .u extension. So there can be 11535717144aSAneesh Kumar K.V * server out there that doesn't support 11545717144aSAneesh Kumar K.V * this even with .u extension. So check 11555717144aSAneesh Kumar K.V * for non NULL stat->extension 11565717144aSAneesh Kumar K.V */ 11575717144aSAneesh Kumar K.V strncpy(ext, stat->extension, sizeof(ext)); 11585717144aSAneesh Kumar K.V /* HARDLINKCOUNT %u */ 11595717144aSAneesh Kumar K.V sscanf(ext, "%13s %u", tag_name, &i_nlink); 11605717144aSAneesh Kumar K.V if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 1161bfe86848SMiklos Szeredi set_nlink(inode, i_nlink); 11625717144aSAneesh Kumar K.V } 11635717144aSAneesh Kumar K.V } 116445089142SAneesh Kumar K.V mode = stat->mode & S_IALLUGO; 116545089142SAneesh Kumar K.V mode |= inode->i_mode & ~S_IALLUGO; 116645089142SAneesh Kumar K.V inode->i_mode = mode; 11677549ae3eSAbhishek Kulkarni i_size_write(inode, stat->length); 11682bad8471SEric Van Hensbergen 1169bd238fb4SLatchesar Ionkov /* not real number of blocks, but 512 byte ones ... */ 11707549ae3eSAbhishek Kulkarni inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 1171b3cbea03SAneesh Kumar K.V v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 11722bad8471SEric Van Hensbergen } 11732bad8471SEric Van Hensbergen 11742bad8471SEric Van Hensbergen /** 11752bad8471SEric Van Hensbergen * v9fs_qid2ino - convert qid into inode number 11762bad8471SEric Van Hensbergen * @qid: qid to hash 11772bad8471SEric Van Hensbergen * 11782bad8471SEric Van Hensbergen * BUG: potential for inode number collisions? 11792bad8471SEric Van Hensbergen */ 11802bad8471SEric Van Hensbergen 1181bd238fb4SLatchesar Ionkov ino_t v9fs_qid2ino(struct p9_qid *qid) 11822bad8471SEric Van Hensbergen { 11832bad8471SEric Van Hensbergen u64 path = qid->path + 2; 11842bad8471SEric Van Hensbergen ino_t i = 0; 11852bad8471SEric Van Hensbergen 11862bad8471SEric Van Hensbergen if (sizeof(ino_t) == sizeof(path)) 11872bad8471SEric Van Hensbergen memcpy(&i, &path, sizeof(ino_t)); 11882bad8471SEric Van Hensbergen else 11892bad8471SEric Van Hensbergen i = (ino_t) (path ^ (path >> 32)); 11902bad8471SEric Van Hensbergen 11912bad8471SEric Van Hensbergen return i; 11922bad8471SEric Van Hensbergen } 11932bad8471SEric Van Hensbergen 11942bad8471SEric Van Hensbergen /** 11952bad8471SEric Van Hensbergen * v9fs_readlink - read a symlink's location (internal version) 11962bad8471SEric Van Hensbergen * @dentry: dentry for symlink 119773c592b9SEric Van Hensbergen * @buffer: buffer to load symlink location into 11982bad8471SEric Van Hensbergen * @buflen: length of buffer 11992bad8471SEric Van Hensbergen * 12002bad8471SEric Van Hensbergen */ 12012bad8471SEric Van Hensbergen 12022bad8471SEric Van Hensbergen static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 12032bad8471SEric Van Hensbergen { 1204bd238fb4SLatchesar Ionkov int retval; 12052bad8471SEric Van Hensbergen 1206bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1207bd238fb4SLatchesar Ionkov struct p9_fid *fid; 120851a87c55SEric Van Hensbergen struct p9_wstat *st; 12092bad8471SEric Van Hensbergen 1210bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 1211bd238fb4SLatchesar Ionkov retval = -EPERM; 121242869c8aSAneesh Kumar K.V v9ses = v9fs_dentry2v9ses(dentry); 1213bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1214da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 1215da977b2cSEric Van Hensbergen return PTR_ERR(fid); 12162bad8471SEric Van Hensbergen 1217329176ccSM. Mohan Kumar if (!v9fs_proto_dotu(v9ses)) 1218bd238fb4SLatchesar Ionkov return -EBADF; 12192bad8471SEric Van Hensbergen 1220bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 1221bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 1222bd238fb4SLatchesar Ionkov return PTR_ERR(st); 12232bad8471SEric Van Hensbergen 1224bd238fb4SLatchesar Ionkov if (!(st->mode & P9_DMSYMLINK)) { 12252bad8471SEric Van Hensbergen retval = -EINVAL; 1226bd238fb4SLatchesar Ionkov goto done; 12272bad8471SEric Van Hensbergen } 12282bad8471SEric Van Hensbergen 12292bad8471SEric Van Hensbergen /* copy extension buffer into buffer */ 123051a87c55SEric Van Hensbergen strncpy(buffer, st->extension, buflen); 12312bad8471SEric Van Hensbergen 1232bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 123351a87c55SEric Van Hensbergen "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); 1234bd238fb4SLatchesar Ionkov 12352511cd0bSMartin Stava retval = strnlen(buffer, buflen); 1236bd238fb4SLatchesar Ionkov done: 123762b2be59SLatchesar Ionkov p9stat_free(st); 1238bd238fb4SLatchesar Ionkov kfree(st); 12392bad8471SEric Van Hensbergen return retval; 12402bad8471SEric Van Hensbergen } 12412bad8471SEric Van Hensbergen 12422bad8471SEric Van Hensbergen /** 12432bad8471SEric Van Hensbergen * v9fs_vfs_follow_link - follow a symlink path 12442bad8471SEric Van Hensbergen * @dentry: dentry for symlink 12452bad8471SEric Van Hensbergen * @nd: nameidata 12462bad8471SEric Van Hensbergen * 12472bad8471SEric Van Hensbergen */ 12482bad8471SEric Van Hensbergen 12492bad8471SEric Van Hensbergen static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 12502bad8471SEric Van Hensbergen { 12512bad8471SEric Van Hensbergen int len = 0; 12522bad8471SEric Van Hensbergen char *link = __getname(); 12532bad8471SEric Van Hensbergen 1254bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); 12552bad8471SEric Van Hensbergen 12562bad8471SEric Van Hensbergen if (!link) 12572bad8471SEric Van Hensbergen link = ERR_PTR(-ENOMEM); 12582bad8471SEric Van Hensbergen else { 125916cce6d2SLatchesar Ionkov len = v9fs_readlink(dentry, link, PATH_MAX); 12602bad8471SEric Van Hensbergen 12612bad8471SEric Van Hensbergen if (len < 0) { 1262ce44eeb6SDavi Arnaut __putname(link); 12632bad8471SEric Van Hensbergen link = ERR_PTR(len); 12642bad8471SEric Van Hensbergen } else 12652511cd0bSMartin Stava link[min(len, PATH_MAX-1)] = 0; 12662bad8471SEric Van Hensbergen } 12672bad8471SEric Van Hensbergen nd_set_link(nd, link); 12682bad8471SEric Van Hensbergen 12692bad8471SEric Van Hensbergen return NULL; 12702bad8471SEric Van Hensbergen } 12712bad8471SEric Van Hensbergen 12722bad8471SEric Van Hensbergen /** 12732bad8471SEric Van Hensbergen * v9fs_vfs_put_link - release a symlink path 12742bad8471SEric Van Hensbergen * @dentry: dentry for symlink 12752bad8471SEric Van Hensbergen * @nd: nameidata 1276ee443996SEric Van Hensbergen * @p: unused 12772bad8471SEric Van Hensbergen * 12782bad8471SEric Van Hensbergen */ 12792bad8471SEric Van Hensbergen 128053c06f4eSAneesh Kumar K.V void 1281ee443996SEric Van Hensbergen v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 12822bad8471SEric Van Hensbergen { 12832bad8471SEric Van Hensbergen char *s = nd_get_link(nd); 12842bad8471SEric Van Hensbergen 12856ff23207SDuane Griffin P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, 12866ff23207SDuane Griffin IS_ERR(s) ? "<error>" : s); 12872bad8471SEric Van Hensbergen if (!IS_ERR(s)) 1288ce44eeb6SDavi Arnaut __putname(s); 12892bad8471SEric Van Hensbergen } 12902bad8471SEric Van Hensbergen 1291ee443996SEric Van Hensbergen /** 1292ee443996SEric Van Hensbergen * v9fs_vfs_mkspecial - create a special file 1293ee443996SEric Van Hensbergen * @dir: inode to create special file in 1294ee443996SEric Van Hensbergen * @dentry: dentry to create 1295ee443996SEric Van Hensbergen * @mode: mode to create special file 1296ee443996SEric Van Hensbergen * @extension: 9p2000.u format extension string representing special file 1297ee443996SEric Van Hensbergen * 1298ee443996SEric Van Hensbergen */ 1299ee443996SEric Van Hensbergen 1300531b1094SLatchesar Ionkov static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1301c2837de7SAl Viro u32 perm, const char *extension) 1302531b1094SLatchesar Ionkov { 1303bd238fb4SLatchesar Ionkov struct p9_fid *fid; 1304d28c61f0SAneesh Kumar K.V struct v9fs_session_info *v9ses; 1305531b1094SLatchesar Ionkov 13066a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 1307dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) { 1308bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); 13096a3124a3SLatchesar Ionkov return -EPERM; 1310531b1094SLatchesar Ionkov } 1311531b1094SLatchesar Ionkov 1312bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1313bd238fb4SLatchesar Ionkov P9_OREAD); 1314bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) 1315bd238fb4SLatchesar Ionkov return PTR_ERR(fid); 1316da977b2cSEric Van Hensbergen 1317d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(dir); 1318bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 13196a3124a3SLatchesar Ionkov return 0; 1320531b1094SLatchesar Ionkov } 1321531b1094SLatchesar Ionkov 1322531b1094SLatchesar Ionkov /** 1323531b1094SLatchesar Ionkov * v9fs_vfs_symlink - helper function to create symlinks 1324531b1094SLatchesar Ionkov * @dir: directory inode containing symlink 1325531b1094SLatchesar Ionkov * @dentry: dentry for symlink 1326531b1094SLatchesar Ionkov * @symname: symlink data 1327531b1094SLatchesar Ionkov * 1328ee443996SEric Van Hensbergen * See Also: 9P2000.u RFC for more information 1329531b1094SLatchesar Ionkov * 1330531b1094SLatchesar Ionkov */ 1331531b1094SLatchesar Ionkov 1332531b1094SLatchesar Ionkov static int 1333531b1094SLatchesar Ionkov v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1334531b1094SLatchesar Ionkov { 1335bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, 1336bd238fb4SLatchesar Ionkov dentry->d_name.name, symname); 1337531b1094SLatchesar Ionkov 1338c2837de7SAl Viro return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1339531b1094SLatchesar Ionkov } 1340531b1094SLatchesar Ionkov 13412bad8471SEric Van Hensbergen /** 13422bad8471SEric Van Hensbergen * v9fs_vfs_link - create a hardlink 13432bad8471SEric Van Hensbergen * @old_dentry: dentry for file to link to 13442bad8471SEric Van Hensbergen * @dir: inode destination for new link 134573c592b9SEric Van Hensbergen * @dentry: dentry for link 13462bad8471SEric Van Hensbergen * 13472bad8471SEric Van Hensbergen */ 13482bad8471SEric Van Hensbergen 13492bad8471SEric Van Hensbergen static int 13502bad8471SEric Van Hensbergen v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 13512bad8471SEric Van Hensbergen struct dentry *dentry) 13522bad8471SEric Van Hensbergen { 1353531b1094SLatchesar Ionkov int retval; 1354531b1094SLatchesar Ionkov char *name; 1355d28c61f0SAneesh Kumar K.V struct p9_fid *oldfid; 13562bad8471SEric Van Hensbergen 1357bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1358bd238fb4SLatchesar Ionkov " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 13592bad8471SEric Van Hensbergen old_dentry->d_name.name); 13602bad8471SEric Van Hensbergen 1361da977b2cSEric Van Hensbergen oldfid = v9fs_fid_clone(old_dentry); 1362da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 1363da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 13642bad8471SEric Van Hensbergen 1365531b1094SLatchesar Ionkov name = __getname(); 1366da977b2cSEric Van Hensbergen if (unlikely(!name)) { 1367da977b2cSEric Van Hensbergen retval = -ENOMEM; 1368da977b2cSEric Van Hensbergen goto clunk_fid; 1369da977b2cSEric Van Hensbergen } 13700710d36aSFlorin Malita 137116cce6d2SLatchesar Ionkov sprintf(name, "%d\n", oldfid->fid); 1372bd238fb4SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1373531b1094SLatchesar Ionkov __putname(name); 1374c06c066aSAneesh Kumar K.V if (!retval) { 1375c06c066aSAneesh Kumar K.V v9fs_refresh_inode(oldfid, old_dentry->d_inode); 1376d28c61f0SAneesh Kumar K.V v9fs_invalidate_inode_attr(dir); 1377c06c066aSAneesh Kumar K.V } 1378da977b2cSEric Van Hensbergen clunk_fid: 1379bd238fb4SLatchesar Ionkov p9_client_clunk(oldfid); 13802bad8471SEric Van Hensbergen return retval; 13812bad8471SEric Van Hensbergen } 13822bad8471SEric Van Hensbergen 13832bad8471SEric Van Hensbergen /** 13842bad8471SEric Van Hensbergen * v9fs_vfs_mknod - create a special file 13852bad8471SEric Van Hensbergen * @dir: inode destination for new link 13862bad8471SEric Van Hensbergen * @dentry: dentry for file 13872bad8471SEric Van Hensbergen * @mode: mode for creation 1388ee443996SEric Van Hensbergen * @rdev: device associated with special file 13892bad8471SEric Van Hensbergen * 13902bad8471SEric Van Hensbergen */ 13912bad8471SEric Van Hensbergen 13922bad8471SEric Van Hensbergen static int 13931a67aafbSAl Viro v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 13942bad8471SEric Van Hensbergen { 1395c2837de7SAl Viro struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1396531b1094SLatchesar Ionkov int retval; 1397531b1094SLatchesar Ionkov char *name; 1398c2837de7SAl Viro u32 perm; 13992bad8471SEric Van Hensbergen 1400bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1401c2837de7SAl Viro " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n", dir->i_ino, 14022bad8471SEric Van Hensbergen dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 14032bad8471SEric Van Hensbergen 1404531b1094SLatchesar Ionkov if (!new_valid_dev(rdev)) 1405531b1094SLatchesar Ionkov return -EINVAL; 140673c592b9SEric Van Hensbergen 1407531b1094SLatchesar Ionkov name = __getname(); 1408c0291a05SEugene Teo if (!name) 1409c0291a05SEugene Teo return -ENOMEM; 14102bad8471SEric Van Hensbergen /* build extension */ 14112bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 1412531b1094SLatchesar Ionkov sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 14132bad8471SEric Van Hensbergen else if (S_ISCHR(mode)) 1414531b1094SLatchesar Ionkov sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 141573c592b9SEric Van Hensbergen else if (S_ISFIFO(mode)) 1416531b1094SLatchesar Ionkov *name = 0; 141775cc5c9bSVenkateswararao Jujjuri else if (S_ISSOCK(mode)) 141875cc5c9bSVenkateswararao Jujjuri *name = 0; 14192bad8471SEric Van Hensbergen else { 1420531b1094SLatchesar Ionkov __putname(name); 1421531b1094SLatchesar Ionkov return -EINVAL; 14222bad8471SEric Van Hensbergen } 14232bad8471SEric Van Hensbergen 1424c2837de7SAl Viro perm = unixmode2p9mode(v9ses, mode); 1425c2837de7SAl Viro retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1426531b1094SLatchesar Ionkov __putname(name); 14272bad8471SEric Van Hensbergen 14282bad8471SEric Van Hensbergen return retval; 14292bad8471SEric Van Hensbergen } 14302bad8471SEric Van Hensbergen 1431b3cbea03SAneesh Kumar K.V int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1432b3cbea03SAneesh Kumar K.V { 143345089142SAneesh Kumar K.V int umode; 143445089142SAneesh Kumar K.V dev_t rdev; 1435b3cbea03SAneesh Kumar K.V loff_t i_size; 1436b3cbea03SAneesh Kumar K.V struct p9_wstat *st; 1437b3cbea03SAneesh Kumar K.V struct v9fs_session_info *v9ses; 1438b3cbea03SAneesh Kumar K.V 1439b3cbea03SAneesh Kumar K.V v9ses = v9fs_inode2v9ses(inode); 1440b3cbea03SAneesh Kumar K.V st = p9_client_stat(fid); 1441b3cbea03SAneesh Kumar K.V if (IS_ERR(st)) 1442b3cbea03SAneesh Kumar K.V return PTR_ERR(st); 144345089142SAneesh Kumar K.V /* 144445089142SAneesh Kumar K.V * Don't update inode if the file type is different 144545089142SAneesh Kumar K.V */ 144645089142SAneesh Kumar K.V umode = p9mode2unixmode(v9ses, st, &rdev); 144745089142SAneesh Kumar K.V if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 144845089142SAneesh Kumar K.V goto out; 1449b3cbea03SAneesh Kumar K.V 1450b3cbea03SAneesh Kumar K.V spin_lock(&inode->i_lock); 1451b3cbea03SAneesh Kumar K.V /* 1452b3cbea03SAneesh Kumar K.V * We don't want to refresh inode->i_size, 1453b3cbea03SAneesh Kumar K.V * because we may have cached data 1454b3cbea03SAneesh Kumar K.V */ 1455b3cbea03SAneesh Kumar K.V i_size = inode->i_size; 1456b3cbea03SAneesh Kumar K.V v9fs_stat2inode(st, inode, inode->i_sb); 1457b3cbea03SAneesh Kumar K.V if (v9ses->cache) 1458b3cbea03SAneesh Kumar K.V inode->i_size = i_size; 1459b3cbea03SAneesh Kumar K.V spin_unlock(&inode->i_lock); 146045089142SAneesh Kumar K.V out: 1461b3cbea03SAneesh Kumar K.V p9stat_free(st); 1462b3cbea03SAneesh Kumar K.V kfree(st); 1463b3cbea03SAneesh Kumar K.V return 0; 1464b3cbea03SAneesh Kumar K.V } 1465b3cbea03SAneesh Kumar K.V 14669b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotu = { 14679b6533c9SSripathi Kodi .create = v9fs_vfs_create, 14689b6533c9SSripathi Kodi .lookup = v9fs_vfs_lookup, 14699b6533c9SSripathi Kodi .symlink = v9fs_vfs_symlink, 147050cc42ffSVenkateswararao Jujjuri (JV) .link = v9fs_vfs_link, 14719b6533c9SSripathi Kodi .unlink = v9fs_vfs_unlink, 14729b6533c9SSripathi Kodi .mkdir = v9fs_vfs_mkdir, 14739b6533c9SSripathi Kodi .rmdir = v9fs_vfs_rmdir, 14741d76e313SAneesh Kumar K.V .mknod = v9fs_vfs_mknod, 14759b6533c9SSripathi Kodi .rename = v9fs_vfs_rename, 14769b6533c9SSripathi Kodi .getattr = v9fs_vfs_getattr, 14779b6533c9SSripathi Kodi .setattr = v9fs_vfs_setattr, 14789b6533c9SSripathi Kodi }; 14799b6533c9SSripathi Kodi 1480754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations = { 1481b501611aSEric Van Hensbergen .create = v9fs_vfs_create, 1482b501611aSEric Van Hensbergen .lookup = v9fs_vfs_lookup, 1483b501611aSEric Van Hensbergen .unlink = v9fs_vfs_unlink, 1484b501611aSEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 1485b501611aSEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 1486b501611aSEric Van Hensbergen .mknod = v9fs_vfs_mknod, 1487b501611aSEric Van Hensbergen .rename = v9fs_vfs_rename, 1488b501611aSEric Van Hensbergen .getattr = v9fs_vfs_getattr, 1489b501611aSEric Van Hensbergen .setattr = v9fs_vfs_setattr, 1490b501611aSEric Van Hensbergen }; 1491b501611aSEric Van Hensbergen 1492754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations = { 14932bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 14942bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 14952bad8471SEric Van Hensbergen }; 14962bad8471SEric Van Hensbergen 1497754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations = { 1498204f2f0eSAl Viro .readlink = generic_readlink, 14992bad8471SEric Van Hensbergen .follow_link = v9fs_vfs_follow_link, 15002bad8471SEric Van Hensbergen .put_link = v9fs_vfs_put_link, 15012bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 15022bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 15032bad8471SEric Van Hensbergen }; 15049b6533c9SSripathi Kodi 1505