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> 372bad8471SEric Van Hensbergen 382bad8471SEric Van Hensbergen #include "debug.h" 392bad8471SEric Van Hensbergen #include "v9fs.h" 402bad8471SEric Van Hensbergen #include "9p.h" 412bad8471SEric Van Hensbergen #include "v9fs_vfs.h" 422bad8471SEric Van Hensbergen #include "fid.h" 432bad8471SEric Van Hensbergen 44754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations; 45754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations_ext; 46754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations; 47754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations; 482bad8471SEric Van Hensbergen 492bad8471SEric Van Hensbergen /** 502bad8471SEric Van Hensbergen * unixmode2p9mode - convert unix mode bits to plan 9 512bad8471SEric Van Hensbergen * @v9ses: v9fs session information 522bad8471SEric Van Hensbergen * @mode: mode to convert 532bad8471SEric Van Hensbergen * 542bad8471SEric Van Hensbergen */ 552bad8471SEric Van Hensbergen 5673c592b9SEric Van Hensbergen static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) 572bad8471SEric Van Hensbergen { 582bad8471SEric Van Hensbergen int res; 592bad8471SEric Van Hensbergen res = mode & 0777; 602bad8471SEric Van Hensbergen if (S_ISDIR(mode)) 612bad8471SEric Van Hensbergen res |= V9FS_DMDIR; 622bad8471SEric Van Hensbergen if (v9ses->extended) { 632bad8471SEric Van Hensbergen if (S_ISLNK(mode)) 642bad8471SEric Van Hensbergen res |= V9FS_DMSYMLINK; 652bad8471SEric Van Hensbergen if (v9ses->nodev == 0) { 662bad8471SEric Van Hensbergen if (S_ISSOCK(mode)) 672bad8471SEric Van Hensbergen res |= V9FS_DMSOCKET; 682bad8471SEric Van Hensbergen if (S_ISFIFO(mode)) 692bad8471SEric Van Hensbergen res |= V9FS_DMNAMEDPIPE; 702bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 712bad8471SEric Van Hensbergen res |= V9FS_DMDEVICE; 722bad8471SEric Van Hensbergen if (S_ISCHR(mode)) 732bad8471SEric Van Hensbergen res |= V9FS_DMDEVICE; 742bad8471SEric Van Hensbergen } 752bad8471SEric Van Hensbergen 762bad8471SEric Van Hensbergen if ((mode & S_ISUID) == S_ISUID) 772bad8471SEric Van Hensbergen res |= V9FS_DMSETUID; 782bad8471SEric Van Hensbergen if ((mode & S_ISGID) == S_ISGID) 792bad8471SEric Van Hensbergen res |= V9FS_DMSETGID; 802bad8471SEric Van Hensbergen if ((mode & V9FS_DMLINK)) 812bad8471SEric Van Hensbergen res |= V9FS_DMLINK; 822bad8471SEric Van Hensbergen } 832bad8471SEric Van Hensbergen 842bad8471SEric Van Hensbergen return res; 852bad8471SEric Van Hensbergen } 862bad8471SEric Van Hensbergen 872bad8471SEric Van Hensbergen /** 882bad8471SEric Van Hensbergen * p9mode2unixmode- convert plan9 mode bits to unix mode bits 892bad8471SEric Van Hensbergen * @v9ses: v9fs session information 902bad8471SEric Van Hensbergen * @mode: mode to convert 912bad8471SEric Van Hensbergen * 922bad8471SEric Van Hensbergen */ 932bad8471SEric Van Hensbergen 9473c592b9SEric Van Hensbergen static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) 952bad8471SEric Van Hensbergen { 962bad8471SEric Van Hensbergen int res; 972bad8471SEric Van Hensbergen 982bad8471SEric Van Hensbergen res = mode & 0777; 992bad8471SEric Van Hensbergen 1002bad8471SEric Van Hensbergen if ((mode & V9FS_DMDIR) == V9FS_DMDIR) 1012bad8471SEric Van Hensbergen res |= S_IFDIR; 1022bad8471SEric Van Hensbergen else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended)) 1032bad8471SEric Van Hensbergen res |= S_IFLNK; 1042bad8471SEric Van Hensbergen else if ((mode & V9FS_DMSOCKET) && (v9ses->extended) 1052bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1062bad8471SEric Van Hensbergen res |= S_IFSOCK; 1072bad8471SEric Van Hensbergen else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended) 1082bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1092bad8471SEric Van Hensbergen res |= S_IFIFO; 1102bad8471SEric Van Hensbergen else if ((mode & V9FS_DMDEVICE) && (v9ses->extended) 1112bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1122bad8471SEric Van Hensbergen res |= S_IFBLK; 1132bad8471SEric Van Hensbergen else 1142bad8471SEric Van Hensbergen res |= S_IFREG; 1152bad8471SEric Van Hensbergen 1162bad8471SEric Van Hensbergen if (v9ses->extended) { 1172bad8471SEric Van Hensbergen if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID) 1182bad8471SEric Van Hensbergen res |= S_ISUID; 1192bad8471SEric Van Hensbergen 1202bad8471SEric Van Hensbergen if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID) 1212bad8471SEric Van Hensbergen res |= S_ISGID; 1222bad8471SEric Van Hensbergen } 1232bad8471SEric Van Hensbergen 1242bad8471SEric Van Hensbergen return res; 1252bad8471SEric Van Hensbergen } 1262bad8471SEric Van Hensbergen 1276a3124a3SLatchesar Ionkov int v9fs_uflags2omode(int uflags) 1286a3124a3SLatchesar Ionkov { 1296a3124a3SLatchesar Ionkov int ret; 1306a3124a3SLatchesar Ionkov 1316a3124a3SLatchesar Ionkov ret = 0; 1326a3124a3SLatchesar Ionkov switch (uflags&3) { 1336a3124a3SLatchesar Ionkov default: 1346a3124a3SLatchesar Ionkov case O_RDONLY: 1356a3124a3SLatchesar Ionkov ret = V9FS_OREAD; 1366a3124a3SLatchesar Ionkov break; 1376a3124a3SLatchesar Ionkov 1386a3124a3SLatchesar Ionkov case O_WRONLY: 1396a3124a3SLatchesar Ionkov ret = V9FS_OWRITE; 1406a3124a3SLatchesar Ionkov break; 1416a3124a3SLatchesar Ionkov 1426a3124a3SLatchesar Ionkov case O_RDWR: 1436a3124a3SLatchesar Ionkov ret = V9FS_ORDWR; 1446a3124a3SLatchesar Ionkov break; 1456a3124a3SLatchesar Ionkov } 1466a3124a3SLatchesar Ionkov 1476a3124a3SLatchesar Ionkov if (uflags & O_EXCL) 1486a3124a3SLatchesar Ionkov ret |= V9FS_OEXCL; 1496a3124a3SLatchesar Ionkov 1506a3124a3SLatchesar Ionkov if (uflags & O_TRUNC) 1516a3124a3SLatchesar Ionkov ret |= V9FS_OTRUNC; 1526a3124a3SLatchesar Ionkov 1536a3124a3SLatchesar Ionkov if (uflags & O_APPEND) 1546a3124a3SLatchesar Ionkov ret |= V9FS_OAPPEND; 1556a3124a3SLatchesar Ionkov 1566a3124a3SLatchesar Ionkov return ret; 1576a3124a3SLatchesar Ionkov } 1586a3124a3SLatchesar Ionkov 1592bad8471SEric Van Hensbergen /** 160531b1094SLatchesar Ionkov * v9fs_blank_wstat - helper function to setup a 9P stat structure 1612bad8471SEric Van Hensbergen * @v9ses: 9P session info (for determining extended mode) 162531b1094SLatchesar Ionkov * @wstat: structure to initialize 1632bad8471SEric Van Hensbergen * 1642bad8471SEric Van Hensbergen */ 1652bad8471SEric Van Hensbergen 16673c592b9SEric Van Hensbergen static void 167531b1094SLatchesar Ionkov v9fs_blank_wstat(struct v9fs_wstat *wstat) 1682bad8471SEric Van Hensbergen { 169531b1094SLatchesar Ionkov wstat->type = ~0; 170531b1094SLatchesar Ionkov wstat->dev = ~0; 171531b1094SLatchesar Ionkov wstat->qid.type = ~0; 172531b1094SLatchesar Ionkov wstat->qid.version = ~0; 173531b1094SLatchesar Ionkov *((long long *)&wstat->qid.path) = ~0; 174531b1094SLatchesar Ionkov wstat->mode = ~0; 175531b1094SLatchesar Ionkov wstat->atime = ~0; 176531b1094SLatchesar Ionkov wstat->mtime = ~0; 177531b1094SLatchesar Ionkov wstat->length = ~0; 178531b1094SLatchesar Ionkov wstat->name = NULL; 179531b1094SLatchesar Ionkov wstat->uid = NULL; 180531b1094SLatchesar Ionkov wstat->gid = NULL; 181531b1094SLatchesar Ionkov wstat->muid = NULL; 182531b1094SLatchesar Ionkov wstat->n_uid = ~0; 183531b1094SLatchesar Ionkov wstat->n_gid = ~0; 184531b1094SLatchesar Ionkov wstat->n_muid = ~0; 185531b1094SLatchesar Ionkov wstat->extension = NULL; 1862bad8471SEric Van Hensbergen } 1872bad8471SEric Van Hensbergen 1882bad8471SEric Van Hensbergen /** 1892bad8471SEric Van Hensbergen * v9fs_get_inode - helper function to setup an inode 1902bad8471SEric Van Hensbergen * @sb: superblock 1912bad8471SEric Van Hensbergen * @mode: mode to setup inode with 1922bad8471SEric Van Hensbergen * 1932bad8471SEric Van Hensbergen */ 1942bad8471SEric Van Hensbergen 1952bad8471SEric Van Hensbergen struct inode *v9fs_get_inode(struct super_block *sb, int mode) 1962bad8471SEric Van Hensbergen { 1976a3124a3SLatchesar Ionkov struct inode *inode; 198b501611aSEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 1992bad8471SEric Van Hensbergen 2002bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 2012bad8471SEric Van Hensbergen 2022bad8471SEric Van Hensbergen inode = new_inode(sb); 2032bad8471SEric Van Hensbergen if (inode) { 2042bad8471SEric Van Hensbergen inode->i_mode = mode; 2052bad8471SEric Van Hensbergen inode->i_uid = current->fsuid; 2062bad8471SEric Van Hensbergen inode->i_gid = current->fsgid; 2072bad8471SEric Van Hensbergen inode->i_blocks = 0; 2082bad8471SEric Van Hensbergen inode->i_rdev = 0; 2092bad8471SEric Van Hensbergen inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 210147b31cfSEric Van Hensbergen inode->i_mapping->a_ops = &v9fs_addr_operations; 2112bad8471SEric Van Hensbergen 2122bad8471SEric Van Hensbergen switch (mode & S_IFMT) { 2132bad8471SEric Van Hensbergen case S_IFIFO: 2142bad8471SEric Van Hensbergen case S_IFBLK: 2152bad8471SEric Van Hensbergen case S_IFCHR: 2162bad8471SEric Van Hensbergen case S_IFSOCK: 217b501611aSEric Van Hensbergen if(!v9ses->extended) { 218b501611aSEric Van Hensbergen dprintk(DEBUG_ERROR, "special files without extended mode\n"); 219b501611aSEric Van Hensbergen return ERR_PTR(-EINVAL); 220b501611aSEric Van Hensbergen } 2215d58bec5SEric Van Hensbergen init_special_inode(inode, inode->i_mode, 2225d58bec5SEric Van Hensbergen inode->i_rdev); 2235d58bec5SEric Van Hensbergen break; 2242bad8471SEric Van Hensbergen case S_IFREG: 2252bad8471SEric Van Hensbergen inode->i_op = &v9fs_file_inode_operations; 2262bad8471SEric Van Hensbergen inode->i_fop = &v9fs_file_operations; 2272bad8471SEric Van Hensbergen break; 228b501611aSEric Van Hensbergen case S_IFLNK: 229b501611aSEric Van Hensbergen if(!v9ses->extended) { 230b501611aSEric Van Hensbergen dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n"); 231b501611aSEric Van Hensbergen return ERR_PTR(-EINVAL); 232b501611aSEric Van Hensbergen } 233b501611aSEric Van Hensbergen inode->i_op = &v9fs_symlink_inode_operations; 234b501611aSEric Van Hensbergen break; 2352bad8471SEric Van Hensbergen case S_IFDIR: 236d8c76e6fSDave Hansen inc_nlink(inode); 237b501611aSEric Van Hensbergen if(v9ses->extended) 238b501611aSEric Van Hensbergen inode->i_op = &v9fs_dir_inode_operations_ext; 239b501611aSEric Van Hensbergen else 2402bad8471SEric Van Hensbergen inode->i_op = &v9fs_dir_inode_operations; 2412bad8471SEric Van Hensbergen inode->i_fop = &v9fs_dir_operations; 2422bad8471SEric Van Hensbergen break; 2432bad8471SEric Van Hensbergen default: 2442bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 2452bad8471SEric Van Hensbergen mode, mode & S_IFMT); 2462bad8471SEric Van Hensbergen return ERR_PTR(-EINVAL); 2472bad8471SEric Van Hensbergen } 2482bad8471SEric Van Hensbergen } else { 2492bad8471SEric Van Hensbergen eprintk(KERN_WARNING, "Problem allocating inode\n"); 2502bad8471SEric Van Hensbergen return ERR_PTR(-ENOMEM); 2512bad8471SEric Van Hensbergen } 2522bad8471SEric Van Hensbergen return inode; 2532bad8471SEric Van Hensbergen } 2542bad8471SEric Van Hensbergen 2552bad8471SEric Van Hensbergen static int 25616cce6d2SLatchesar Ionkov v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name, u32 perm, 25716cce6d2SLatchesar Ionkov u8 mode, char *extension, u32 *fidp, struct v9fs_qid *qid, u32 *iounit) 2582bad8471SEric Van Hensbergen { 259736c4b85SMika Kukkonen int fid; 2603cf6429aSLatchesar Ionkov int err; 2616a3124a3SLatchesar Ionkov struct v9fs_fcall *fcall; 2622bad8471SEric Van Hensbergen 2636a3124a3SLatchesar Ionkov fid = v9fs_get_idpool(&v9ses->fidpool); 2646a3124a3SLatchesar Ionkov if (fid < 0) { 2652bad8471SEric Van Hensbergen eprintk(KERN_WARNING, "no free fids available\n"); 266731805b4SLatchesar Ionkov return -ENOSPC; 2672bad8471SEric Van Hensbergen } 2682bad8471SEric Van Hensbergen 2696a3124a3SLatchesar Ionkov err = v9fs_t_walk(v9ses, pfid, fid, NULL, &fcall); 2706a3124a3SLatchesar Ionkov if (err < 0) { 271531b1094SLatchesar Ionkov PRINT_FCALL_ERROR("clone error", fcall); 27241e5a6acSLatchesar Ionkov if (fcall && fcall->id == RWALK) 27341e5a6acSLatchesar Ionkov goto clunk_fid; 27441e5a6acSLatchesar Ionkov else 27516cce6d2SLatchesar Ionkov goto put_fid; 2762bad8471SEric Van Hensbergen } 2772bad8471SEric Van Hensbergen kfree(fcall); 2782bad8471SEric Van Hensbergen 27916cce6d2SLatchesar Ionkov err = v9fs_t_create(v9ses, fid, name, perm, mode, extension, &fcall); 2806a3124a3SLatchesar Ionkov if (err < 0) { 281531b1094SLatchesar Ionkov PRINT_FCALL_ERROR("create fails", fcall); 28216cce6d2SLatchesar Ionkov goto clunk_fid; 2832bad8471SEric Van Hensbergen } 2842bad8471SEric Van Hensbergen 2856a3124a3SLatchesar Ionkov if (iounit) 2866a3124a3SLatchesar Ionkov *iounit = fcall->params.rcreate.iounit; 2876a3124a3SLatchesar Ionkov 2886a3124a3SLatchesar Ionkov if (qid) 2896a3124a3SLatchesar Ionkov *qid = fcall->params.rcreate.qid; 2906a3124a3SLatchesar Ionkov 2916a3124a3SLatchesar Ionkov if (fidp) 2926a3124a3SLatchesar Ionkov *fidp = fid; 2936a3124a3SLatchesar Ionkov 2942bad8471SEric Van Hensbergen kfree(fcall); 2956a3124a3SLatchesar Ionkov return 0; 2962bad8471SEric Van Hensbergen 29716cce6d2SLatchesar Ionkov clunk_fid: 29816cce6d2SLatchesar Ionkov v9fs_t_clunk(v9ses, fid); 29916cce6d2SLatchesar Ionkov fid = V9FS_NOFID; 30016cce6d2SLatchesar Ionkov 30116cce6d2SLatchesar Ionkov put_fid: 3029d7fa400SLatchesar Ionkov if (fid != V9FS_NOFID) 3036a3124a3SLatchesar Ionkov v9fs_put_idpool(fid, &v9ses->fidpool); 3046a3124a3SLatchesar Ionkov 3056a3124a3SLatchesar Ionkov kfree(fcall); 3066a3124a3SLatchesar Ionkov return err; 3072bad8471SEric Van Hensbergen } 3082bad8471SEric Van Hensbergen 3096a3124a3SLatchesar Ionkov static struct v9fs_fid* 3106a3124a3SLatchesar Ionkov v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 3116a3124a3SLatchesar Ionkov { 3126a3124a3SLatchesar Ionkov int err; 313736c4b85SMika Kukkonen int nfid; 3146a3124a3SLatchesar Ionkov struct v9fs_fid *ret; 3156a3124a3SLatchesar Ionkov struct v9fs_fcall *fcall; 3160b8dd177SLatchesar Ionkov 3176a3124a3SLatchesar Ionkov nfid = v9fs_get_idpool(&v9ses->fidpool); 3186a3124a3SLatchesar Ionkov if (nfid < 0) { 3190b8dd177SLatchesar Ionkov eprintk(KERN_WARNING, "no free fids available\n"); 320731805b4SLatchesar Ionkov return ERR_PTR(-ENOSPC); 3210b8dd177SLatchesar Ionkov } 3220b8dd177SLatchesar Ionkov 3236a3124a3SLatchesar Ionkov err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 3246a3124a3SLatchesar Ionkov &fcall); 3256a3124a3SLatchesar Ionkov 3266a3124a3SLatchesar Ionkov if (err < 0) { 32741e5a6acSLatchesar Ionkov if (fcall && fcall->id == RWALK) 32841e5a6acSLatchesar Ionkov goto clunk_fid; 32941e5a6acSLatchesar Ionkov 3306a3124a3SLatchesar Ionkov PRINT_FCALL_ERROR("walk error", fcall); 3316a3124a3SLatchesar Ionkov v9fs_put_idpool(nfid, &v9ses->fidpool); 3326a3124a3SLatchesar Ionkov goto error; 3330b8dd177SLatchesar Ionkov } 3346a3124a3SLatchesar Ionkov 3353cf6429aSLatchesar Ionkov kfree(fcall); 3363cf6429aSLatchesar Ionkov fcall = NULL; 3376a3124a3SLatchesar Ionkov ret = v9fs_fid_create(v9ses, nfid); 3386a3124a3SLatchesar Ionkov if (!ret) { 3396a3124a3SLatchesar Ionkov err = -ENOMEM; 3406a3124a3SLatchesar Ionkov goto clunk_fid; 3410b8dd177SLatchesar Ionkov } 3422bad8471SEric Van Hensbergen 3436a3124a3SLatchesar Ionkov err = v9fs_fid_insert(ret, dentry); 3446a3124a3SLatchesar Ionkov if (err < 0) { 3456a3124a3SLatchesar Ionkov v9fs_fid_destroy(ret); 3466a3124a3SLatchesar Ionkov goto clunk_fid; 3476a3124a3SLatchesar Ionkov } 3482bad8471SEric Van Hensbergen 3496a3124a3SLatchesar Ionkov return ret; 3506a3124a3SLatchesar Ionkov 3516a3124a3SLatchesar Ionkov clunk_fid: 3526a3124a3SLatchesar Ionkov v9fs_t_clunk(v9ses, nfid); 3536a3124a3SLatchesar Ionkov 3546a3124a3SLatchesar Ionkov error: 3556a3124a3SLatchesar Ionkov kfree(fcall); 3566a3124a3SLatchesar Ionkov return ERR_PTR(err); 3576a3124a3SLatchesar Ionkov } 3586a3124a3SLatchesar Ionkov 3595174fdabSLatchesar Ionkov static struct inode * 3606a3124a3SLatchesar Ionkov v9fs_inode_from_fid(struct v9fs_session_info *v9ses, u32 fid, 3616a3124a3SLatchesar Ionkov struct super_block *sb) 3626a3124a3SLatchesar Ionkov { 3636a3124a3SLatchesar Ionkov int err, umode; 3646a3124a3SLatchesar Ionkov struct inode *ret; 3656a3124a3SLatchesar Ionkov struct v9fs_fcall *fcall; 3666a3124a3SLatchesar Ionkov 3676a3124a3SLatchesar Ionkov ret = NULL; 3686a3124a3SLatchesar Ionkov err = v9fs_t_stat(v9ses, fid, &fcall); 3696a3124a3SLatchesar Ionkov if (err) { 370531b1094SLatchesar Ionkov PRINT_FCALL_ERROR("stat error", fcall); 3716a3124a3SLatchesar Ionkov goto error; 3722bad8471SEric Van Hensbergen } 3732bad8471SEric Van Hensbergen 3746a3124a3SLatchesar Ionkov umode = p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode); 3756a3124a3SLatchesar Ionkov ret = v9fs_get_inode(sb, umode); 3766a3124a3SLatchesar Ionkov if (IS_ERR(ret)) { 3776a3124a3SLatchesar Ionkov err = PTR_ERR(ret); 3786a3124a3SLatchesar Ionkov ret = NULL; 3796a3124a3SLatchesar Ionkov goto error; 3802bad8471SEric Van Hensbergen } 3812bad8471SEric Van Hensbergen 3826a3124a3SLatchesar Ionkov v9fs_stat2inode(&fcall->params.rstat.stat, ret, sb); 3832bad8471SEric Van Hensbergen kfree(fcall); 3846a3124a3SLatchesar Ionkov return ret; 3852bad8471SEric Van Hensbergen 3866a3124a3SLatchesar Ionkov error: 3872bad8471SEric Van Hensbergen kfree(fcall); 3886a3124a3SLatchesar Ionkov if (ret) 3896a3124a3SLatchesar Ionkov iput(ret); 3902bad8471SEric Van Hensbergen 3916a3124a3SLatchesar Ionkov return ERR_PTR(err); 3922bad8471SEric Van Hensbergen } 3932bad8471SEric Van Hensbergen 3942bad8471SEric Van Hensbergen /** 3952bad8471SEric Van Hensbergen * v9fs_remove - helper function to remove files and directories 39673c592b9SEric Van Hensbergen * @dir: directory inode that is being deleted 39773c592b9SEric Van Hensbergen * @file: dentry that is being deleted 39873c592b9SEric Van Hensbergen * @rmdir: removing a directory 3992bad8471SEric Van Hensbergen * 4002bad8471SEric Van Hensbergen */ 4012bad8471SEric Van Hensbergen 4022bad8471SEric Van Hensbergen static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) 4032bad8471SEric Van Hensbergen { 4042bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 4052bad8471SEric Van Hensbergen struct super_block *sb = NULL; 4062bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = NULL; 4072bad8471SEric Van Hensbergen struct v9fs_fid *v9fid = NULL; 4082bad8471SEric Van Hensbergen struct inode *file_inode = NULL; 4092bad8471SEric Van Hensbergen int fid = -1; 4102bad8471SEric Van Hensbergen int result = 0; 4112bad8471SEric Van Hensbergen 4122bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, 4132bad8471SEric Van Hensbergen rmdir); 4142bad8471SEric Van Hensbergen 4152bad8471SEric Van Hensbergen file_inode = file->d_inode; 4162bad8471SEric Van Hensbergen sb = file_inode->i_sb; 4172bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(file_inode); 418c959df9fSLatchesar Ionkov v9fid = v9fs_fid_clone(file); 419da977b2cSEric Van Hensbergen if(IS_ERR(v9fid)) 420da977b2cSEric Van Hensbergen return PTR_ERR(v9fid); 4212bad8471SEric Van Hensbergen 4222bad8471SEric Van Hensbergen fid = v9fid->fid; 4232bad8471SEric Van Hensbergen if (fid < 0) { 4242bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n", 4252bad8471SEric Van Hensbergen file_inode->i_ino); 4262bad8471SEric Van Hensbergen return -EBADF; 4272bad8471SEric Van Hensbergen } 4282bad8471SEric Van Hensbergen 4292bad8471SEric Van Hensbergen result = v9fs_t_remove(v9ses, fid, &fcall); 430531b1094SLatchesar Ionkov if (result < 0) { 431531b1094SLatchesar Ionkov PRINT_FCALL_ERROR("remove fails", fcall); 432da977b2cSEric Van Hensbergen goto Error; 433834a9b8cSEric Van Hensbergen } 434834a9b8cSEric Van Hensbergen 4352bad8471SEric Van Hensbergen v9fs_put_idpool(fid, &v9ses->fidpool); 4362bad8471SEric Van Hensbergen v9fs_fid_destroy(v9fid); 4372bad8471SEric Van Hensbergen 438da977b2cSEric Van Hensbergen Error: 4392bad8471SEric Van Hensbergen kfree(fcall); 4402bad8471SEric Van Hensbergen return result; 4412bad8471SEric Van Hensbergen } 4422bad8471SEric Van Hensbergen 4436a3124a3SLatchesar Ionkov static int 4446a3124a3SLatchesar Ionkov v9fs_open_created(struct inode *inode, struct file *file) 4456a3124a3SLatchesar Ionkov { 4466a3124a3SLatchesar Ionkov return 0; 4476a3124a3SLatchesar Ionkov } 4486a3124a3SLatchesar Ionkov 4492bad8471SEric Van Hensbergen /** 4502bad8471SEric Van Hensbergen * v9fs_vfs_create - VFS hook to create files 4512bad8471SEric Van Hensbergen * @inode: directory inode that is being deleted 4522bad8471SEric Van Hensbergen * @dentry: dentry that is being deleted 4536a3124a3SLatchesar Ionkov * @mode: create permissions 4542bad8471SEric Van Hensbergen * @nd: path information 4552bad8471SEric Van Hensbergen * 4562bad8471SEric Van Hensbergen */ 4572bad8471SEric Van Hensbergen 4582bad8471SEric Van Hensbergen static int 4596a3124a3SLatchesar Ionkov v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 4602bad8471SEric Van Hensbergen struct nameidata *nd) 4612bad8471SEric Van Hensbergen { 4626a3124a3SLatchesar Ionkov int err; 4636a3124a3SLatchesar Ionkov u32 fid, perm, iounit; 4646a3124a3SLatchesar Ionkov int flags; 4656a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 4666a3124a3SLatchesar Ionkov struct v9fs_fid *dfid, *vfid, *ffid; 4676a3124a3SLatchesar Ionkov struct inode *inode; 4686a3124a3SLatchesar Ionkov struct v9fs_qid qid; 4696a3124a3SLatchesar Ionkov struct file *filp; 4706a3124a3SLatchesar Ionkov 4716a3124a3SLatchesar Ionkov inode = NULL; 4726a3124a3SLatchesar Ionkov vfid = NULL; 4736a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 474da977b2cSEric Van Hensbergen dfid = v9fs_fid_clone(dentry->d_parent); 475da977b2cSEric Van Hensbergen if(IS_ERR(dfid)) { 476da977b2cSEric Van Hensbergen err = PTR_ERR(dfid); 477da977b2cSEric Van Hensbergen goto error; 478da977b2cSEric Van Hensbergen } 4796a3124a3SLatchesar Ionkov 480da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 4816a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) 4826a3124a3SLatchesar Ionkov flags = nd->intent.open.flags - 1; 4836a3124a3SLatchesar Ionkov else 4846a3124a3SLatchesar Ionkov flags = O_RDWR; 4856a3124a3SLatchesar Ionkov 4866a3124a3SLatchesar Ionkov err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, 48716cce6d2SLatchesar Ionkov perm, v9fs_uflags2omode(flags), NULL, &fid, &qid, &iounit); 4886a3124a3SLatchesar Ionkov 4896a3124a3SLatchesar Ionkov if (err) 490da977b2cSEric Van Hensbergen goto clunk_dfid; 4916a3124a3SLatchesar Ionkov 4926a3124a3SLatchesar Ionkov vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); 493da977b2cSEric Van Hensbergen v9fs_fid_clunk(v9ses, dfid); 4946a3124a3SLatchesar Ionkov if (IS_ERR(vfid)) { 4956a3124a3SLatchesar Ionkov err = PTR_ERR(vfid); 4966a3124a3SLatchesar Ionkov vfid = NULL; 4976a3124a3SLatchesar Ionkov goto error; 4986a3124a3SLatchesar Ionkov } 4996a3124a3SLatchesar Ionkov 5006a3124a3SLatchesar Ionkov inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); 5016a3124a3SLatchesar Ionkov if (IS_ERR(inode)) { 5026a3124a3SLatchesar Ionkov err = PTR_ERR(inode); 5036a3124a3SLatchesar Ionkov inode = NULL; 5046a3124a3SLatchesar Ionkov goto error; 5056a3124a3SLatchesar Ionkov } 5066a3124a3SLatchesar Ionkov 507e03abc0cSEric Van Hensbergen if(v9ses->cache) 508e03abc0cSEric Van Hensbergen dentry->d_op = &v9fs_cached_dentry_operations; 509e03abc0cSEric Van Hensbergen else 5106a3124a3SLatchesar Ionkov dentry->d_op = &v9fs_dentry_operations; 5116a3124a3SLatchesar Ionkov d_instantiate(dentry, inode); 5126a3124a3SLatchesar Ionkov 5136a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) { 5146a3124a3SLatchesar Ionkov ffid = v9fs_fid_create(v9ses, fid); 5156a3124a3SLatchesar Ionkov if (!ffid) 5166a3124a3SLatchesar Ionkov return -ENOMEM; 5176a3124a3SLatchesar Ionkov 5186a3124a3SLatchesar Ionkov filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); 5196a3124a3SLatchesar Ionkov if (IS_ERR(filp)) { 5206a3124a3SLatchesar Ionkov v9fs_fid_destroy(ffid); 5216a3124a3SLatchesar Ionkov return PTR_ERR(filp); 5226a3124a3SLatchesar Ionkov } 5236a3124a3SLatchesar Ionkov 5246a3124a3SLatchesar Ionkov ffid->rdir_pos = 0; 5256a3124a3SLatchesar Ionkov ffid->rdir_fcall = NULL; 5266a3124a3SLatchesar Ionkov ffid->fidopen = 1; 5276a3124a3SLatchesar Ionkov ffid->iounit = iounit; 5286a3124a3SLatchesar Ionkov ffid->filp = filp; 5296a3124a3SLatchesar Ionkov filp->private_data = ffid; 5306a3124a3SLatchesar Ionkov } 5316a3124a3SLatchesar Ionkov 5326a3124a3SLatchesar Ionkov return 0; 5336a3124a3SLatchesar Ionkov 534da977b2cSEric Van Hensbergen clunk_dfid: 535da977b2cSEric Van Hensbergen v9fs_fid_clunk(v9ses, dfid); 536da977b2cSEric Van Hensbergen 5376a3124a3SLatchesar Ionkov error: 5386a3124a3SLatchesar Ionkov if (vfid) 5396a3124a3SLatchesar Ionkov v9fs_fid_destroy(vfid); 5406a3124a3SLatchesar Ionkov 5416a3124a3SLatchesar Ionkov return err; 5422bad8471SEric Van Hensbergen } 5432bad8471SEric Van Hensbergen 5442bad8471SEric Van Hensbergen /** 5452bad8471SEric Van Hensbergen * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 54673c592b9SEric Van Hensbergen * @inode: inode that is being unlinked 5472bad8471SEric Van Hensbergen * @dentry: dentry that is being unlinked 5482bad8471SEric Van Hensbergen * @mode: mode for new directory 5492bad8471SEric Van Hensbergen * 5502bad8471SEric Van Hensbergen */ 5512bad8471SEric Van Hensbergen 5526a3124a3SLatchesar Ionkov static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 5532bad8471SEric Van Hensbergen { 5546a3124a3SLatchesar Ionkov int err; 5556a3124a3SLatchesar Ionkov u32 fid, perm; 5566a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 5576a3124a3SLatchesar Ionkov struct v9fs_fid *dfid, *vfid; 5586a3124a3SLatchesar Ionkov struct inode *inode; 5596a3124a3SLatchesar Ionkov 5606a3124a3SLatchesar Ionkov inode = NULL; 5616a3124a3SLatchesar Ionkov vfid = NULL; 5626a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 563da977b2cSEric Van Hensbergen dfid = v9fs_fid_clone(dentry->d_parent); 564da977b2cSEric Van Hensbergen if(IS_ERR(dfid)) { 565da977b2cSEric Van Hensbergen err = PTR_ERR(dfid); 566da977b2cSEric Van Hensbergen goto error; 567da977b2cSEric Van Hensbergen } 568da977b2cSEric Van Hensbergen 5696a3124a3SLatchesar Ionkov perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 5706a3124a3SLatchesar Ionkov 5716a3124a3SLatchesar Ionkov err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, 57216cce6d2SLatchesar Ionkov perm, V9FS_OREAD, NULL, &fid, NULL, NULL); 5736a3124a3SLatchesar Ionkov 5746a3124a3SLatchesar Ionkov if (err) { 5756a3124a3SLatchesar Ionkov dprintk(DEBUG_ERROR, "create error %d\n", err); 576da977b2cSEric Van Hensbergen goto clean_up_dfid; 5776a3124a3SLatchesar Ionkov } 5786a3124a3SLatchesar Ionkov 5796a3124a3SLatchesar Ionkov vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); 5806a3124a3SLatchesar Ionkov if (IS_ERR(vfid)) { 5816a3124a3SLatchesar Ionkov err = PTR_ERR(vfid); 5826a3124a3SLatchesar Ionkov vfid = NULL; 583da977b2cSEric Van Hensbergen goto clean_up_dfid; 5846a3124a3SLatchesar Ionkov } 5856a3124a3SLatchesar Ionkov 586da977b2cSEric Van Hensbergen v9fs_fid_clunk(v9ses, dfid); 5876a3124a3SLatchesar Ionkov inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); 5886a3124a3SLatchesar Ionkov if (IS_ERR(inode)) { 5896a3124a3SLatchesar Ionkov err = PTR_ERR(inode); 5906a3124a3SLatchesar Ionkov inode = NULL; 591835d90c4SAdrian Bunk v9fs_fid_destroy(vfid); 592835d90c4SAdrian Bunk goto error; 5936a3124a3SLatchesar Ionkov } 5946a3124a3SLatchesar Ionkov 595e03abc0cSEric Van Hensbergen if(v9ses->cache) 596e03abc0cSEric Van Hensbergen dentry->d_op = &v9fs_cached_dentry_operations; 597e03abc0cSEric Van Hensbergen else 5986a3124a3SLatchesar Ionkov dentry->d_op = &v9fs_dentry_operations; 5996a3124a3SLatchesar Ionkov d_instantiate(dentry, inode); 6006a3124a3SLatchesar Ionkov return 0; 6016a3124a3SLatchesar Ionkov 602da977b2cSEric Van Hensbergen clean_up_dfid: 603da977b2cSEric Van Hensbergen v9fs_fid_clunk(v9ses, dfid); 604da977b2cSEric Van Hensbergen 605da977b2cSEric Van Hensbergen error: 6066a3124a3SLatchesar Ionkov return err; 6072bad8471SEric Van Hensbergen } 6082bad8471SEric Van Hensbergen 6092bad8471SEric Van Hensbergen /** 6102bad8471SEric Van Hensbergen * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 6112bad8471SEric Van Hensbergen * @dir: inode that is being walked from 6122bad8471SEric Van Hensbergen * @dentry: dentry that is being walked to? 6132bad8471SEric Van Hensbergen * @nameidata: path data 6142bad8471SEric Van Hensbergen * 6152bad8471SEric Van Hensbergen */ 6162bad8471SEric Van Hensbergen 6172bad8471SEric Van Hensbergen static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 6182bad8471SEric Van Hensbergen struct nameidata *nameidata) 6192bad8471SEric Van Hensbergen { 6202bad8471SEric Van Hensbergen struct super_block *sb; 6212bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses; 6222bad8471SEric Van Hensbergen struct v9fs_fid *dirfid; 6232bad8471SEric Van Hensbergen struct v9fs_fid *fid; 6242bad8471SEric Van Hensbergen struct inode *inode; 6252bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 6262bad8471SEric Van Hensbergen int dirfidnum = -1; 6272bad8471SEric Van Hensbergen int newfid = -1; 6282bad8471SEric Van Hensbergen int result = 0; 6292bad8471SEric Van Hensbergen 6302bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 631731805b4SLatchesar Ionkov dir, dentry->d_name.name, dentry, nameidata); 6322bad8471SEric Van Hensbergen 6332bad8471SEric Van Hensbergen sb = dir->i_sb; 6342bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(dir); 6350b8dd177SLatchesar Ionkov dirfid = v9fs_fid_lookup(dentry->d_parent); 6362bad8471SEric Van Hensbergen 637da977b2cSEric Van Hensbergen if(IS_ERR(dirfid)) 638da977b2cSEric Van Hensbergen return ERR_PTR(PTR_ERR(dirfid)); 6392bad8471SEric Van Hensbergen 6402bad8471SEric Van Hensbergen dirfidnum = dirfid->fid; 6412bad8471SEric Van Hensbergen 6422bad8471SEric Van Hensbergen newfid = v9fs_get_idpool(&v9ses->fidpool); 6432bad8471SEric Van Hensbergen if (newfid < 0) { 6442bad8471SEric Van Hensbergen eprintk(KERN_WARNING, "newfid fails!\n"); 645da977b2cSEric Van Hensbergen result = -ENOSPC; 646da977b2cSEric Van Hensbergen goto Release_Dirfid; 6472bad8471SEric Van Hensbergen } 6482bad8471SEric Van Hensbergen 6496a3124a3SLatchesar Ionkov result = v9fs_t_walk(v9ses, dirfidnum, newfid, 65041e5a6acSLatchesar Ionkov (char *)dentry->d_name.name, &fcall); 65141e5a6acSLatchesar Ionkov 652da977b2cSEric Van Hensbergen up(&dirfid->lock); 653da977b2cSEric Van Hensbergen 6542bad8471SEric Van Hensbergen if (result < 0) { 65541e5a6acSLatchesar Ionkov if (fcall && fcall->id == RWALK) 65641e5a6acSLatchesar Ionkov v9fs_t_clunk(v9ses, newfid); 65741e5a6acSLatchesar Ionkov else 6582bad8471SEric Van Hensbergen v9fs_put_idpool(newfid, &v9ses->fidpool); 65941e5a6acSLatchesar Ionkov 6602bad8471SEric Van Hensbergen if (result == -ENOENT) { 6612bad8471SEric Van Hensbergen d_add(dentry, NULL); 6620b8dd177SLatchesar Ionkov dprintk(DEBUG_VFS, 6632bad8471SEric Van Hensbergen "Return negative dentry %p count %d\n", 6642bad8471SEric Van Hensbergen dentry, atomic_read(&dentry->d_count)); 66541e5a6acSLatchesar Ionkov kfree(fcall); 6662bad8471SEric Van Hensbergen return NULL; 6672bad8471SEric Van Hensbergen } 6682bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "walk error:%d\n", result); 6692bad8471SEric Van Hensbergen goto FreeFcall; 6702bad8471SEric Van Hensbergen } 67141e5a6acSLatchesar Ionkov kfree(fcall); 6722bad8471SEric Van Hensbergen 6732bad8471SEric Van Hensbergen result = v9fs_t_stat(v9ses, newfid, &fcall); 6742bad8471SEric Van Hensbergen if (result < 0) { 6752bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "stat error\n"); 6762bad8471SEric Van Hensbergen goto FreeFcall; 6772bad8471SEric Van Hensbergen } 6782bad8471SEric Van Hensbergen 679531b1094SLatchesar Ionkov inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses, 680531b1094SLatchesar Ionkov fcall->params.rstat.stat.mode)); 6812bad8471SEric Van Hensbergen 6822bad8471SEric Van Hensbergen if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) { 6832bad8471SEric Van Hensbergen eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n", 6842bad8471SEric Van Hensbergen PTR_ERR(inode)); 6852bad8471SEric Van Hensbergen 6862bad8471SEric Van Hensbergen result = -ENOSPC; 6872bad8471SEric Van Hensbergen goto FreeFcall; 6882bad8471SEric Van Hensbergen } 6892bad8471SEric Van Hensbergen 690531b1094SLatchesar Ionkov inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid); 6912bad8471SEric Van Hensbergen 6926a3124a3SLatchesar Ionkov fid = v9fs_fid_create(v9ses, newfid); 6932bad8471SEric Van Hensbergen if (fid == NULL) { 6942bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "couldn't insert\n"); 6952bad8471SEric Van Hensbergen result = -ENOMEM; 6962bad8471SEric Van Hensbergen goto FreeFcall; 6972bad8471SEric Van Hensbergen } 6982bad8471SEric Van Hensbergen 6996a3124a3SLatchesar Ionkov result = v9fs_fid_insert(fid, dentry); 7006a3124a3SLatchesar Ionkov if (result < 0) 7016a3124a3SLatchesar Ionkov goto FreeFcall; 7026a3124a3SLatchesar Ionkov 703531b1094SLatchesar Ionkov fid->qid = fcall->params.rstat.stat.qid; 704531b1094SLatchesar Ionkov v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb); 705e03abc0cSEric Van Hensbergen if((fid->qid.version)&&(v9ses->cache)) 706e03abc0cSEric Van Hensbergen dentry->d_op = &v9fs_cached_dentry_operations; 707e03abc0cSEric Van Hensbergen else 708e03abc0cSEric Van Hensbergen dentry->d_op = &v9fs_dentry_operations; 7092bad8471SEric Van Hensbergen 7102bad8471SEric Van Hensbergen d_add(dentry, inode); 7112bad8471SEric Van Hensbergen kfree(fcall); 7122bad8471SEric Van Hensbergen 7132bad8471SEric Van Hensbergen return NULL; 7142bad8471SEric Van Hensbergen 715da977b2cSEric Van Hensbergen Release_Dirfid: 716da977b2cSEric Van Hensbergen up(&dirfid->lock); 717da977b2cSEric Van Hensbergen 7182bad8471SEric Van Hensbergen FreeFcall: 7192bad8471SEric Van Hensbergen kfree(fcall); 720da977b2cSEric Van Hensbergen 7212bad8471SEric Van Hensbergen return ERR_PTR(result); 7222bad8471SEric Van Hensbergen } 7232bad8471SEric Van Hensbergen 7242bad8471SEric Van Hensbergen /** 7252bad8471SEric Van Hensbergen * v9fs_vfs_unlink - VFS unlink hook to delete an inode 7262bad8471SEric Van Hensbergen * @i: inode that is being unlinked 72773c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7282bad8471SEric Van Hensbergen * 7292bad8471SEric Van Hensbergen */ 7302bad8471SEric Van Hensbergen 7312bad8471SEric Van Hensbergen static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 7322bad8471SEric Van Hensbergen { 7332bad8471SEric Van Hensbergen return v9fs_remove(i, d, 0); 7342bad8471SEric Van Hensbergen } 7352bad8471SEric Van Hensbergen 7362bad8471SEric Van Hensbergen /** 7372bad8471SEric Van Hensbergen * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 7382bad8471SEric Van Hensbergen * @i: inode that is being unlinked 73973c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7402bad8471SEric Van Hensbergen * 7412bad8471SEric Van Hensbergen */ 7422bad8471SEric Van Hensbergen 7432bad8471SEric Van Hensbergen static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 7442bad8471SEric Van Hensbergen { 7452bad8471SEric Van Hensbergen return v9fs_remove(i, d, 1); 7462bad8471SEric Van Hensbergen } 7472bad8471SEric Van Hensbergen 7482bad8471SEric Van Hensbergen /** 7492bad8471SEric Van Hensbergen * v9fs_vfs_rename - VFS hook to rename an inode 7502bad8471SEric Van Hensbergen * @old_dir: old dir inode 7512bad8471SEric Van Hensbergen * @old_dentry: old dentry 7522bad8471SEric Van Hensbergen * @new_dir: new dir inode 7532bad8471SEric Van Hensbergen * @new_dentry: new dentry 7542bad8471SEric Van Hensbergen * 7552bad8471SEric Van Hensbergen */ 7562bad8471SEric Van Hensbergen 7572bad8471SEric Van Hensbergen static int 7582bad8471SEric Van Hensbergen v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 7592bad8471SEric Van Hensbergen struct inode *new_dir, struct dentry *new_dentry) 7602bad8471SEric Van Hensbergen { 7612bad8471SEric Van Hensbergen struct inode *old_inode = old_dentry->d_inode; 7622bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode); 7630b8dd177SLatchesar Ionkov struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry); 764da977b2cSEric Van Hensbergen struct v9fs_fid *olddirfid; 765da977b2cSEric Van Hensbergen struct v9fs_fid *newdirfid; 766531b1094SLatchesar Ionkov struct v9fs_wstat wstat; 7672bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 7682bad8471SEric Van Hensbergen int fid = -1; 7692bad8471SEric Van Hensbergen int olddirfidnum = -1; 7702bad8471SEric Van Hensbergen int newdirfidnum = -1; 7712bad8471SEric Van Hensbergen int retval = 0; 7722bad8471SEric Van Hensbergen 7732bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, "\n"); 7742bad8471SEric Van Hensbergen 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); 781da977b2cSEric Van Hensbergen goto Release_lock; 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); 787da977b2cSEric Van Hensbergen goto Clunk_olddir; 7882bad8471SEric Van Hensbergen } 7892bad8471SEric Van Hensbergen 7902bad8471SEric Van Hensbergen /* 9P can only handle file rename in the same directory */ 7912bad8471SEric Van Hensbergen if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { 7922bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "old dir and new dir are different\n"); 793621997cdSEric Van Hensbergen retval = -EXDEV; 794da977b2cSEric Van Hensbergen goto Clunk_newdir; 7952bad8471SEric Van Hensbergen } 7962bad8471SEric Van Hensbergen 7972bad8471SEric Van Hensbergen fid = oldfid->fid; 7982bad8471SEric Van Hensbergen olddirfidnum = olddirfid->fid; 7992bad8471SEric Van Hensbergen newdirfidnum = newdirfid->fid; 8002bad8471SEric Van Hensbergen 8012bad8471SEric Van Hensbergen if (fid < 0) { 8022bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "no fid for old file #%lu\n", 8032bad8471SEric Van Hensbergen old_inode->i_ino); 8042bad8471SEric Van Hensbergen retval = -EBADF; 805da977b2cSEric Van Hensbergen goto Clunk_newdir; 8062bad8471SEric Van Hensbergen } 8072bad8471SEric Van Hensbergen 808531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 809531b1094SLatchesar Ionkov wstat.muid = v9ses->name; 810531b1094SLatchesar Ionkov wstat.name = (char *) new_dentry->d_name.name; 8112bad8471SEric Van Hensbergen 812531b1094SLatchesar Ionkov retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall); 8132bad8471SEric Van Hensbergen 8142bad8471SEric Van Hensbergen if (retval < 0) 815531b1094SLatchesar Ionkov PRINT_FCALL_ERROR("wstat error", fcall); 8162bad8471SEric Van Hensbergen 8172bad8471SEric Van Hensbergen kfree(fcall); 818da977b2cSEric Van Hensbergen 819da977b2cSEric Van Hensbergen Clunk_newdir: 820da977b2cSEric Van Hensbergen v9fs_fid_clunk(v9ses, newdirfid); 821da977b2cSEric Van Hensbergen 822da977b2cSEric Van Hensbergen Clunk_olddir: 823da977b2cSEric Van Hensbergen v9fs_fid_clunk(v9ses, olddirfid); 824da977b2cSEric Van Hensbergen 825da977b2cSEric Van Hensbergen Release_lock: 826da977b2cSEric Van Hensbergen up(&oldfid->lock); 827da977b2cSEric Van Hensbergen 8282bad8471SEric Van Hensbergen return retval; 8292bad8471SEric Van Hensbergen } 8302bad8471SEric Van Hensbergen 8312bad8471SEric Van Hensbergen /** 832943ffb58SAdrian Bunk * v9fs_vfs_getattr - retrieve file metadata 8332bad8471SEric Van Hensbergen * @mnt - mount information 8342bad8471SEric Van Hensbergen * @dentry - file to get attributes on 8352bad8471SEric Van Hensbergen * @stat - metadata structure to populate 8362bad8471SEric Van Hensbergen * 8372bad8471SEric Van Hensbergen */ 8382bad8471SEric Van Hensbergen 8392bad8471SEric Van Hensbergen static int 8402bad8471SEric Van Hensbergen v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 8412bad8471SEric Van Hensbergen struct kstat *stat) 8422bad8471SEric Van Hensbergen { 8432bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 8442bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); 845da977b2cSEric Van Hensbergen struct v9fs_fid *fid = v9fs_fid_clone(dentry); 8462bad8471SEric Van Hensbergen int err = -EPERM; 8472bad8471SEric Van Hensbergen 8482bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, "dentry: %p\n", dentry); 849da977b2cSEric Van Hensbergen if(IS_ERR(fid)) 850da977b2cSEric Van Hensbergen return PTR_ERR(fid); 8512bad8471SEric Van Hensbergen 8522bad8471SEric Van Hensbergen err = v9fs_t_stat(v9ses, fid->fid, &fcall); 8532bad8471SEric Van Hensbergen 8542bad8471SEric Van Hensbergen if (err < 0) 8552bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "stat error\n"); 8562bad8471SEric Van Hensbergen else { 857531b1094SLatchesar Ionkov v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode, 8582bad8471SEric Van Hensbergen dentry->d_inode->i_sb); 8592bad8471SEric Van Hensbergen generic_fillattr(dentry->d_inode, stat); 8602bad8471SEric Van Hensbergen } 8612bad8471SEric Van Hensbergen 8622bad8471SEric Van Hensbergen kfree(fcall); 863da977b2cSEric Van Hensbergen v9fs_fid_clunk(v9ses, fid); 8642bad8471SEric Van Hensbergen return err; 8652bad8471SEric Van Hensbergen } 8662bad8471SEric Van Hensbergen 8672bad8471SEric Van Hensbergen /** 8682bad8471SEric Van Hensbergen * v9fs_vfs_setattr - set file metadata 8692bad8471SEric Van Hensbergen * @dentry: file whose metadata to set 8702bad8471SEric Van Hensbergen * @iattr: metadata assignment structure 8712bad8471SEric Van Hensbergen * 8722bad8471SEric Van Hensbergen */ 8732bad8471SEric Van Hensbergen 8742bad8471SEric Van Hensbergen static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 8752bad8471SEric Van Hensbergen { 8762bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); 877da977b2cSEric Van Hensbergen struct v9fs_fid *fid = v9fs_fid_clone(dentry); 8782bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 879531b1094SLatchesar Ionkov struct v9fs_wstat wstat; 8802bad8471SEric Van Hensbergen int res = -EPERM; 8812bad8471SEric Van Hensbergen 8822bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, "\n"); 883da977b2cSEric Van Hensbergen if(IS_ERR(fid)) 884da977b2cSEric Van Hensbergen return PTR_ERR(fid); 8852bad8471SEric Van Hensbergen 886531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 8872bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MODE) 888531b1094SLatchesar Ionkov wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 8892bad8471SEric Van Hensbergen 8902bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MTIME) 891531b1094SLatchesar Ionkov wstat.mtime = iattr->ia_mtime.tv_sec; 8922bad8471SEric Van Hensbergen 8932bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_ATIME) 894531b1094SLatchesar Ionkov wstat.atime = iattr->ia_atime.tv_sec; 8952bad8471SEric Van Hensbergen 8962bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_SIZE) 897531b1094SLatchesar Ionkov wstat.length = iattr->ia_size; 8982bad8471SEric Van Hensbergen 8992bad8471SEric Van Hensbergen if (v9ses->extended) { 900531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_UID) 901531b1094SLatchesar Ionkov wstat.n_uid = iattr->ia_uid; 9022bad8471SEric Van Hensbergen 903531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_GID) 904531b1094SLatchesar Ionkov wstat.n_gid = iattr->ia_gid; 9052bad8471SEric Van Hensbergen } 9062bad8471SEric Van Hensbergen 907531b1094SLatchesar Ionkov res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall); 9082bad8471SEric Van Hensbergen 9092bad8471SEric Van Hensbergen if (res < 0) 910531b1094SLatchesar Ionkov PRINT_FCALL_ERROR("wstat error", fcall); 9112bad8471SEric Van Hensbergen 9122bad8471SEric Van Hensbergen kfree(fcall); 9132bad8471SEric Van Hensbergen if (res >= 0) 9142bad8471SEric Van Hensbergen res = inode_setattr(dentry->d_inode, iattr); 9152bad8471SEric Van Hensbergen 916da977b2cSEric Van Hensbergen v9fs_fid_clunk(v9ses, fid); 9172bad8471SEric Van Hensbergen return res; 9182bad8471SEric Van Hensbergen } 9192bad8471SEric Van Hensbergen 9202bad8471SEric Van Hensbergen /** 921531b1094SLatchesar Ionkov * v9fs_stat2inode - populate an inode structure with mistat info 922531b1094SLatchesar Ionkov * @stat: Plan 9 metadata (mistat) structure 9232bad8471SEric Van Hensbergen * @inode: inode to populate 9242bad8471SEric Van Hensbergen * @sb: superblock of filesystem 9252bad8471SEric Van Hensbergen * 9262bad8471SEric Van Hensbergen */ 9272bad8471SEric Van Hensbergen 9282bad8471SEric Van Hensbergen void 929531b1094SLatchesar Ionkov v9fs_stat2inode(struct v9fs_stat *stat, struct inode *inode, 9302bad8471SEric Van Hensbergen struct super_block *sb) 9312bad8471SEric Van Hensbergen { 9321dac06b2SLatchesar Ionkov int n; 933531b1094SLatchesar Ionkov char ext[32]; 9342bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 9352bad8471SEric Van Hensbergen 9362bad8471SEric Van Hensbergen inode->i_nlink = 1; 9372bad8471SEric Van Hensbergen 938531b1094SLatchesar Ionkov inode->i_atime.tv_sec = stat->atime; 939531b1094SLatchesar Ionkov inode->i_mtime.tv_sec = stat->mtime; 940531b1094SLatchesar Ionkov inode->i_ctime.tv_sec = stat->mtime; 9412bad8471SEric Van Hensbergen 9422bad8471SEric Van Hensbergen inode->i_uid = v9ses->uid; 9432bad8471SEric Van Hensbergen inode->i_gid = v9ses->gid; 9442bad8471SEric Van Hensbergen 945531b1094SLatchesar Ionkov if (v9ses->extended) { 946531b1094SLatchesar Ionkov inode->i_uid = stat->n_uid; 947531b1094SLatchesar Ionkov inode->i_gid = stat->n_gid; 948531b1094SLatchesar Ionkov } 949531b1094SLatchesar Ionkov 950531b1094SLatchesar Ionkov inode->i_mode = p9mode2unixmode(v9ses, stat->mode); 9512bad8471SEric Van Hensbergen if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 9522bad8471SEric Van Hensbergen char type = 0; 9532bad8471SEric Van Hensbergen int major = -1; 9542bad8471SEric Van Hensbergen int minor = -1; 955531b1094SLatchesar Ionkov 9561dac06b2SLatchesar Ionkov n = stat->extension.len; 9571dac06b2SLatchesar Ionkov if (n > sizeof(ext)-1) 9581dac06b2SLatchesar Ionkov n = sizeof(ext)-1; 9591dac06b2SLatchesar Ionkov memmove(ext, stat->extension.str, n); 9601dac06b2SLatchesar Ionkov ext[n] = 0; 961531b1094SLatchesar Ionkov sscanf(ext, "%c %u %u", &type, &major, &minor); 9622bad8471SEric Van Hensbergen switch (type) { 9632bad8471SEric Van Hensbergen case 'c': 9642bad8471SEric Van Hensbergen inode->i_mode &= ~S_IFBLK; 9652bad8471SEric Van Hensbergen inode->i_mode |= S_IFCHR; 9662bad8471SEric Van Hensbergen break; 9672bad8471SEric Van Hensbergen case 'b': 9682bad8471SEric Van Hensbergen break; 9692bad8471SEric Van Hensbergen default: 970531b1094SLatchesar Ionkov dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n", 971531b1094SLatchesar Ionkov type, stat->extension.len, stat->extension.str); 9722bad8471SEric Van Hensbergen }; 9732bad8471SEric Van Hensbergen inode->i_rdev = MKDEV(major, minor); 9742bad8471SEric Van Hensbergen } else 9752bad8471SEric Van Hensbergen inode->i_rdev = 0; 9762bad8471SEric Van Hensbergen 977531b1094SLatchesar Ionkov inode->i_size = stat->length; 9782bad8471SEric Van Hensbergen 9792bad8471SEric Van Hensbergen inode->i_blocks = 980ba52de12STheodore Ts'o (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 9812bad8471SEric Van Hensbergen } 9822bad8471SEric Van Hensbergen 9832bad8471SEric Van Hensbergen /** 9842bad8471SEric Van Hensbergen * v9fs_qid2ino - convert qid into inode number 9852bad8471SEric Van Hensbergen * @qid: qid to hash 9862bad8471SEric Van Hensbergen * 9872bad8471SEric Van Hensbergen * BUG: potential for inode number collisions? 9882bad8471SEric Van Hensbergen */ 9892bad8471SEric Van Hensbergen 9902bad8471SEric Van Hensbergen ino_t v9fs_qid2ino(struct v9fs_qid *qid) 9912bad8471SEric Van Hensbergen { 9922bad8471SEric Van Hensbergen u64 path = qid->path + 2; 9932bad8471SEric Van Hensbergen ino_t i = 0; 9942bad8471SEric Van Hensbergen 9952bad8471SEric Van Hensbergen if (sizeof(ino_t) == sizeof(path)) 9962bad8471SEric Van Hensbergen memcpy(&i, &path, sizeof(ino_t)); 9972bad8471SEric Van Hensbergen else 9982bad8471SEric Van Hensbergen i = (ino_t) (path ^ (path >> 32)); 9992bad8471SEric Van Hensbergen 10002bad8471SEric Van Hensbergen return i; 10012bad8471SEric Van Hensbergen } 10022bad8471SEric Van Hensbergen 10032bad8471SEric Van Hensbergen /** 10042bad8471SEric Van Hensbergen * v9fs_readlink - read a symlink's location (internal version) 10052bad8471SEric Van Hensbergen * @dentry: dentry for symlink 100673c592b9SEric Van Hensbergen * @buffer: buffer to load symlink location into 10072bad8471SEric Van Hensbergen * @buflen: length of buffer 10082bad8471SEric Van Hensbergen * 10092bad8471SEric Van Hensbergen */ 10102bad8471SEric Van Hensbergen 10112bad8471SEric Van Hensbergen static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 10122bad8471SEric Van Hensbergen { 10132bad8471SEric Van Hensbergen int retval = -EPERM; 10142bad8471SEric Van Hensbergen 10152bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 10162bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); 1017da977b2cSEric Van Hensbergen struct v9fs_fid *fid = v9fs_fid_clone(dentry); 10182bad8471SEric Van Hensbergen 1019da977b2cSEric Van Hensbergen if(IS_ERR(fid)) 1020da977b2cSEric Van Hensbergen return PTR_ERR(fid); 10212bad8471SEric Van Hensbergen 10222bad8471SEric Van Hensbergen if (!v9ses->extended) { 10232bad8471SEric Van Hensbergen retval = -EBADF; 10242bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "not extended\n"); 1025da977b2cSEric Van Hensbergen goto ClunkFid; 10262bad8471SEric Van Hensbergen } 10272bad8471SEric Van Hensbergen 10282bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name); 10292bad8471SEric Van Hensbergen retval = v9fs_t_stat(v9ses, fid->fid, &fcall); 10302bad8471SEric Van Hensbergen 10312bad8471SEric Van Hensbergen if (retval < 0) { 10322bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "stat error\n"); 10332bad8471SEric Van Hensbergen goto FreeFcall; 10342bad8471SEric Van Hensbergen } 10352bad8471SEric Van Hensbergen 1036da977b2cSEric Van Hensbergen if (!fcall) { 1037da977b2cSEric Van Hensbergen retval = -EIO; 1038da977b2cSEric Van Hensbergen goto ClunkFid; 1039da977b2cSEric Van Hensbergen } 10402bad8471SEric Van Hensbergen 1041531b1094SLatchesar Ionkov if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) { 10422bad8471SEric Van Hensbergen retval = -EINVAL; 10432bad8471SEric Van Hensbergen goto FreeFcall; 10442bad8471SEric Van Hensbergen } 10452bad8471SEric Van Hensbergen 10462bad8471SEric Van Hensbergen /* copy extension buffer into buffer */ 10476a3124a3SLatchesar Ionkov if (fcall->params.rstat.stat.extension.len < buflen) 104816cce6d2SLatchesar Ionkov buflen = fcall->params.rstat.stat.extension.len + 1; 10492bad8471SEric Van Hensbergen 105016cce6d2SLatchesar Ionkov memmove(buffer, fcall->params.rstat.stat.extension.str, buflen - 1); 1051531b1094SLatchesar Ionkov buffer[buflen-1] = 0; 10522bad8471SEric Van Hensbergen 105316cce6d2SLatchesar Ionkov dprintk(DEBUG_ERROR, "%s -> %.*s (%s)\n", dentry->d_name.name, fcall->params.rstat.stat.extension.len, 105416cce6d2SLatchesar Ionkov fcall->params.rstat.stat.extension.str, buffer); 10552bad8471SEric Van Hensbergen retval = buflen; 10562bad8471SEric Van Hensbergen 10572bad8471SEric Van Hensbergen FreeFcall: 10582bad8471SEric Van Hensbergen kfree(fcall); 10592bad8471SEric Van Hensbergen 1060da977b2cSEric Van Hensbergen ClunkFid: 1061da977b2cSEric Van Hensbergen v9fs_fid_clunk(v9ses, fid); 1062da977b2cSEric Van Hensbergen 10632bad8471SEric Van Hensbergen return retval; 10642bad8471SEric Van Hensbergen } 10652bad8471SEric Van Hensbergen 10662bad8471SEric Van Hensbergen /** 10672bad8471SEric Van Hensbergen * v9fs_vfs_readlink - read a symlink's location 10682bad8471SEric Van Hensbergen * @dentry: dentry for symlink 10692bad8471SEric Van Hensbergen * @buf: buffer to load symlink location into 10702bad8471SEric Van Hensbergen * @buflen: length of buffer 10712bad8471SEric Van Hensbergen * 10722bad8471SEric Van Hensbergen */ 10732bad8471SEric Van Hensbergen 10742bad8471SEric Van Hensbergen static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, 10752bad8471SEric Van Hensbergen int buflen) 10762bad8471SEric Van Hensbergen { 10772bad8471SEric Van Hensbergen int retval; 10782bad8471SEric Van Hensbergen int ret; 10792bad8471SEric Van Hensbergen char *link = __getname(); 10802bad8471SEric Van Hensbergen 10810710d36aSFlorin Malita if (unlikely(!link)) 10820710d36aSFlorin Malita return -ENOMEM; 10830710d36aSFlorin Malita 1084a1f9d8d2SLatchesar Ionkov if (buflen > PATH_MAX) 1085a1f9d8d2SLatchesar Ionkov buflen = PATH_MAX; 10862bad8471SEric Van Hensbergen 10872bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); 10882bad8471SEric Van Hensbergen 10892bad8471SEric Van Hensbergen retval = v9fs_readlink(dentry, link, buflen); 10902bad8471SEric Van Hensbergen 10912bad8471SEric Van Hensbergen if (retval > 0) { 10922bad8471SEric Van Hensbergen if ((ret = copy_to_user(buffer, link, retval)) != 0) { 10932bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "problem copying to user: %d\n", 10942bad8471SEric Van Hensbergen ret); 10952bad8471SEric Van Hensbergen retval = ret; 10962bad8471SEric Van Hensbergen } 10972bad8471SEric Van Hensbergen } 10982bad8471SEric Van Hensbergen 1099ce44eeb6SDavi Arnaut __putname(link); 11002bad8471SEric Van Hensbergen return retval; 11012bad8471SEric Van Hensbergen } 11022bad8471SEric Van Hensbergen 11032bad8471SEric Van Hensbergen /** 11042bad8471SEric Van Hensbergen * v9fs_vfs_follow_link - follow a symlink path 11052bad8471SEric Van Hensbergen * @dentry: dentry for symlink 11062bad8471SEric Van Hensbergen * @nd: nameidata 11072bad8471SEric Van Hensbergen * 11082bad8471SEric Van Hensbergen */ 11092bad8471SEric Van Hensbergen 11102bad8471SEric Van Hensbergen static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 11112bad8471SEric Van Hensbergen { 11122bad8471SEric Van Hensbergen int len = 0; 11132bad8471SEric Van Hensbergen char *link = __getname(); 11142bad8471SEric Van Hensbergen 11152bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, "%s n", dentry->d_name.name); 11162bad8471SEric Van Hensbergen 11172bad8471SEric Van Hensbergen if (!link) 11182bad8471SEric Van Hensbergen link = ERR_PTR(-ENOMEM); 11192bad8471SEric Van Hensbergen else { 112016cce6d2SLatchesar Ionkov len = v9fs_readlink(dentry, link, PATH_MAX); 11212bad8471SEric Van Hensbergen 11222bad8471SEric Van Hensbergen if (len < 0) { 1123ce44eeb6SDavi Arnaut __putname(link); 11242bad8471SEric Van Hensbergen link = ERR_PTR(len); 11252bad8471SEric Van Hensbergen } else 11262bad8471SEric Van Hensbergen link[len] = 0; 11272bad8471SEric Van Hensbergen } 11282bad8471SEric Van Hensbergen nd_set_link(nd, link); 11292bad8471SEric Van Hensbergen 11302bad8471SEric Van Hensbergen return NULL; 11312bad8471SEric Van Hensbergen } 11322bad8471SEric Van Hensbergen 11332bad8471SEric Van Hensbergen /** 11342bad8471SEric Van Hensbergen * v9fs_vfs_put_link - release a symlink path 11352bad8471SEric Van Hensbergen * @dentry: dentry for symlink 11362bad8471SEric Van Hensbergen * @nd: nameidata 11372bad8471SEric Van Hensbergen * 11382bad8471SEric Van Hensbergen */ 11392bad8471SEric Van Hensbergen 11402bad8471SEric Van Hensbergen static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 11412bad8471SEric Van Hensbergen { 11422bad8471SEric Van Hensbergen char *s = nd_get_link(nd); 11432bad8471SEric Van Hensbergen 11442bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); 11452bad8471SEric Van Hensbergen if (!IS_ERR(s)) 1146ce44eeb6SDavi Arnaut __putname(s); 11472bad8471SEric Van Hensbergen } 11482bad8471SEric Van Hensbergen 1149531b1094SLatchesar Ionkov static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1150531b1094SLatchesar Ionkov int mode, const char *extension) 1151531b1094SLatchesar Ionkov { 11526a3124a3SLatchesar Ionkov int err; 11536a3124a3SLatchesar Ionkov u32 fid, perm; 1154531b1094SLatchesar Ionkov struct v9fs_session_info *v9ses; 1155da977b2cSEric Van Hensbergen struct v9fs_fid *dfid, *vfid = NULL; 1156da977b2cSEric Van Hensbergen struct inode *inode = NULL; 1157531b1094SLatchesar Ionkov 11586a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 1159531b1094SLatchesar Ionkov if (!v9ses->extended) { 1160531b1094SLatchesar Ionkov dprintk(DEBUG_ERROR, "not extended\n"); 11616a3124a3SLatchesar Ionkov return -EPERM; 1162531b1094SLatchesar Ionkov } 1163531b1094SLatchesar Ionkov 1164da977b2cSEric Van Hensbergen dfid = v9fs_fid_clone(dentry->d_parent); 1165da977b2cSEric Van Hensbergen if(IS_ERR(dfid)) { 1166da977b2cSEric Van Hensbergen err = PTR_ERR(dfid); 1167da977b2cSEric Van Hensbergen goto error; 1168da977b2cSEric Van Hensbergen } 1169da977b2cSEric Van Hensbergen 1170da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 1171da977b2cSEric Van Hensbergen 11726a3124a3SLatchesar Ionkov err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, 117316cce6d2SLatchesar Ionkov perm, V9FS_OREAD, (char *) extension, &fid, NULL, NULL); 1174531b1094SLatchesar Ionkov 11756a3124a3SLatchesar Ionkov if (err) 1176da977b2cSEric Van Hensbergen goto clunk_dfid; 11776a3124a3SLatchesar Ionkov 11786a3124a3SLatchesar Ionkov err = v9fs_t_clunk(v9ses, fid); 11796a3124a3SLatchesar Ionkov if (err) 1180da977b2cSEric Van Hensbergen goto clunk_dfid; 11816a3124a3SLatchesar Ionkov 11826a3124a3SLatchesar Ionkov vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); 11836a3124a3SLatchesar Ionkov if (IS_ERR(vfid)) { 11846a3124a3SLatchesar Ionkov err = PTR_ERR(vfid); 11856a3124a3SLatchesar Ionkov vfid = NULL; 1186da977b2cSEric Van Hensbergen goto clunk_dfid; 11876a3124a3SLatchesar Ionkov } 11886a3124a3SLatchesar Ionkov 11896a3124a3SLatchesar Ionkov inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); 11906a3124a3SLatchesar Ionkov if (IS_ERR(inode)) { 11916a3124a3SLatchesar Ionkov err = PTR_ERR(inode); 11926a3124a3SLatchesar Ionkov inode = NULL; 1193da977b2cSEric Van Hensbergen goto free_vfid; 1194531b1094SLatchesar Ionkov } 1195531b1094SLatchesar Ionkov 1196e03abc0cSEric Van Hensbergen if(v9ses->cache) 1197e03abc0cSEric Van Hensbergen dentry->d_op = &v9fs_cached_dentry_operations; 1198e03abc0cSEric Van Hensbergen else 11996a3124a3SLatchesar Ionkov dentry->d_op = &v9fs_dentry_operations; 12006a3124a3SLatchesar Ionkov d_instantiate(dentry, inode); 12016a3124a3SLatchesar Ionkov return 0; 12026a3124a3SLatchesar Ionkov 1203da977b2cSEric Van Hensbergen free_vfid: 12046a3124a3SLatchesar Ionkov v9fs_fid_destroy(vfid); 12056a3124a3SLatchesar Ionkov 1206da977b2cSEric Van Hensbergen clunk_dfid: 1207da977b2cSEric Van Hensbergen v9fs_fid_clunk(v9ses, dfid); 1208da977b2cSEric Van Hensbergen 1209da977b2cSEric Van Hensbergen error: 12106a3124a3SLatchesar Ionkov return err; 12116a3124a3SLatchesar Ionkov 1212531b1094SLatchesar Ionkov } 1213531b1094SLatchesar Ionkov 1214531b1094SLatchesar Ionkov /** 1215531b1094SLatchesar Ionkov * v9fs_vfs_symlink - helper function to create symlinks 1216531b1094SLatchesar Ionkov * @dir: directory inode containing symlink 1217531b1094SLatchesar Ionkov * @dentry: dentry for symlink 1218531b1094SLatchesar Ionkov * @symname: symlink data 1219531b1094SLatchesar Ionkov * 1220531b1094SLatchesar Ionkov * See 9P2000.u RFC for more information 1221531b1094SLatchesar Ionkov * 1222531b1094SLatchesar Ionkov */ 1223531b1094SLatchesar Ionkov 1224531b1094SLatchesar Ionkov static int 1225531b1094SLatchesar Ionkov v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1226531b1094SLatchesar Ionkov { 1227531b1094SLatchesar Ionkov dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 1228531b1094SLatchesar Ionkov symname); 1229531b1094SLatchesar Ionkov 1230531b1094SLatchesar Ionkov return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1231531b1094SLatchesar Ionkov } 1232531b1094SLatchesar Ionkov 12332bad8471SEric Van Hensbergen /** 12342bad8471SEric Van Hensbergen * v9fs_vfs_link - create a hardlink 12352bad8471SEric Van Hensbergen * @old_dentry: dentry for file to link to 12362bad8471SEric Van Hensbergen * @dir: inode destination for new link 123773c592b9SEric Van Hensbergen * @dentry: dentry for link 12382bad8471SEric Van Hensbergen * 12392bad8471SEric Van Hensbergen */ 12402bad8471SEric Van Hensbergen 12412bad8471SEric Van Hensbergen /* XXX - lots of code dup'd from symlink and creates, 12422bad8471SEric Van Hensbergen * figure out a better reuse strategy 12432bad8471SEric Van Hensbergen */ 12442bad8471SEric Van Hensbergen 12452bad8471SEric Van Hensbergen static int 12462bad8471SEric Van Hensbergen v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 12472bad8471SEric Van Hensbergen struct dentry *dentry) 12482bad8471SEric Van Hensbergen { 1249531b1094SLatchesar Ionkov int retval; 1250da977b2cSEric Van Hensbergen struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1251531b1094SLatchesar Ionkov struct v9fs_fid *oldfid; 1252531b1094SLatchesar Ionkov char *name; 12532bad8471SEric Van Hensbergen 12542bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 12552bad8471SEric Van Hensbergen old_dentry->d_name.name); 12562bad8471SEric Van Hensbergen 1257da977b2cSEric Van Hensbergen oldfid = v9fs_fid_clone(old_dentry); 1258da977b2cSEric Van Hensbergen if(IS_ERR(oldfid)) 1259da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 12602bad8471SEric Van Hensbergen 1261531b1094SLatchesar Ionkov name = __getname(); 1262da977b2cSEric Van Hensbergen if (unlikely(!name)) { 1263da977b2cSEric Van Hensbergen retval = -ENOMEM; 1264da977b2cSEric Van Hensbergen goto clunk_fid; 1265da977b2cSEric Van Hensbergen } 12660710d36aSFlorin Malita 126716cce6d2SLatchesar Ionkov sprintf(name, "%d\n", oldfid->fid); 1268531b1094SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name); 1269531b1094SLatchesar Ionkov __putname(name); 12702bad8471SEric Van Hensbergen 1271da977b2cSEric Van Hensbergen clunk_fid: 1272da977b2cSEric Van Hensbergen v9fs_fid_clunk(v9ses, oldfid); 12732bad8471SEric Van Hensbergen return retval; 12742bad8471SEric Van Hensbergen } 12752bad8471SEric Van Hensbergen 12762bad8471SEric Van Hensbergen /** 12772bad8471SEric Van Hensbergen * v9fs_vfs_mknod - create a special file 12782bad8471SEric Van Hensbergen * @dir: inode destination for new link 12792bad8471SEric Van Hensbergen * @dentry: dentry for file 12802bad8471SEric Van Hensbergen * @mode: mode for creation 12812bad8471SEric Van Hensbergen * @dev_t: device associated with special file 12822bad8471SEric Van Hensbergen * 12832bad8471SEric Van Hensbergen */ 12842bad8471SEric Van Hensbergen 12852bad8471SEric Van Hensbergen static int 12862bad8471SEric Van Hensbergen v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 12872bad8471SEric Van Hensbergen { 1288531b1094SLatchesar Ionkov int retval; 1289531b1094SLatchesar Ionkov char *name; 12902bad8471SEric Van Hensbergen 12912bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 12922bad8471SEric Van Hensbergen dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 12932bad8471SEric Van Hensbergen 1294531b1094SLatchesar Ionkov if (!new_valid_dev(rdev)) 1295531b1094SLatchesar Ionkov return -EINVAL; 129673c592b9SEric Van Hensbergen 1297531b1094SLatchesar Ionkov name = __getname(); 1298c0291a05SEugene Teo if (!name) 1299c0291a05SEugene Teo return -ENOMEM; 13002bad8471SEric Van Hensbergen /* build extension */ 13012bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 1302531b1094SLatchesar Ionkov sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 13032bad8471SEric Van Hensbergen else if (S_ISCHR(mode)) 1304531b1094SLatchesar Ionkov sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 130573c592b9SEric Van Hensbergen else if (S_ISFIFO(mode)) 1306531b1094SLatchesar Ionkov *name = 0; 13072bad8471SEric Van Hensbergen else { 1308531b1094SLatchesar Ionkov __putname(name); 1309531b1094SLatchesar Ionkov return -EINVAL; 13102bad8471SEric Van Hensbergen } 13112bad8471SEric Van Hensbergen 1312531b1094SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1313531b1094SLatchesar Ionkov __putname(name); 13142bad8471SEric Van Hensbergen 13152bad8471SEric Van Hensbergen return retval; 13162bad8471SEric Van Hensbergen } 13172bad8471SEric Van Hensbergen 1318754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations_ext = { 13192bad8471SEric Van Hensbergen .create = v9fs_vfs_create, 13202bad8471SEric Van Hensbergen .lookup = v9fs_vfs_lookup, 13212bad8471SEric Van Hensbergen .symlink = v9fs_vfs_symlink, 13222bad8471SEric Van Hensbergen .link = v9fs_vfs_link, 13232bad8471SEric Van Hensbergen .unlink = v9fs_vfs_unlink, 13242bad8471SEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 13252bad8471SEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 13262bad8471SEric Van Hensbergen .mknod = v9fs_vfs_mknod, 13272bad8471SEric Van Hensbergen .rename = v9fs_vfs_rename, 13282bad8471SEric Van Hensbergen .readlink = v9fs_vfs_readlink, 13292bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 13302bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 13312bad8471SEric Van Hensbergen }; 13322bad8471SEric Van Hensbergen 1333754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations = { 1334b501611aSEric Van Hensbergen .create = v9fs_vfs_create, 1335b501611aSEric Van Hensbergen .lookup = v9fs_vfs_lookup, 1336b501611aSEric Van Hensbergen .unlink = v9fs_vfs_unlink, 1337b501611aSEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 1338b501611aSEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 1339b501611aSEric Van Hensbergen .mknod = v9fs_vfs_mknod, 1340b501611aSEric Van Hensbergen .rename = v9fs_vfs_rename, 1341b501611aSEric Van Hensbergen .getattr = v9fs_vfs_getattr, 1342b501611aSEric Van Hensbergen .setattr = v9fs_vfs_setattr, 1343b501611aSEric Van Hensbergen }; 1344b501611aSEric Van Hensbergen 1345754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations = { 13462bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 13472bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 13482bad8471SEric Van Hensbergen }; 13492bad8471SEric Van Hensbergen 1350754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations = { 13512bad8471SEric Van Hensbergen .readlink = v9fs_vfs_readlink, 13522bad8471SEric Van Hensbergen .follow_link = v9fs_vfs_follow_link, 13532bad8471SEric Van Hensbergen .put_link = v9fs_vfs_put_link, 13542bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 13552bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 13562bad8471SEric Van Hensbergen }; 1357