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 102bad8471SEric Van Hensbergen * it under the terms of the GNU General Public License as published by 112bad8471SEric Van Hensbergen * the Free Software Foundation; either version 2 of the License, or 122bad8471SEric Van Hensbergen * (at your option) any later version. 132bad8471SEric Van Hensbergen * 142bad8471SEric Van Hensbergen * This program is distributed in the hope that it will be useful, 152bad8471SEric Van Hensbergen * but WITHOUT ANY WARRANTY; without even the implied warranty of 162bad8471SEric Van Hensbergen * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 172bad8471SEric Van Hensbergen * GNU General Public License for more details. 182bad8471SEric Van Hensbergen * 192bad8471SEric Van Hensbergen * You should have received a copy of the GNU General Public License 202bad8471SEric Van Hensbergen * along with this program; if not, write to: 212bad8471SEric Van Hensbergen * Free Software Foundation 222bad8471SEric Van Hensbergen * 51 Franklin Street, Fifth Floor 232bad8471SEric Van Hensbergen * Boston, MA 02111-1301 USA 242bad8471SEric Van Hensbergen * 252bad8471SEric Van Hensbergen */ 262bad8471SEric Van Hensbergen 272bad8471SEric Van Hensbergen #include <linux/module.h> 282bad8471SEric Van Hensbergen #include <linux/errno.h> 292bad8471SEric Van Hensbergen #include <linux/fs.h> 302bad8471SEric Van Hensbergen #include <linux/file.h> 312bad8471SEric Van Hensbergen #include <linux/pagemap.h> 322bad8471SEric Van Hensbergen #include <linux/stat.h> 332bad8471SEric Van Hensbergen #include <linux/string.h> 342bad8471SEric Van Hensbergen #include <linux/smp_lock.h> 352bad8471SEric Van Hensbergen #include <linux/inet.h> 362bad8471SEric Van Hensbergen #include <linux/namei.h> 372bad8471SEric Van Hensbergen #include <linux/idr.h> 382bad8471SEric Van Hensbergen 392bad8471SEric Van Hensbergen #include "debug.h" 402bad8471SEric Van Hensbergen #include "v9fs.h" 412bad8471SEric Van Hensbergen #include "9p.h" 422bad8471SEric Van Hensbergen #include "v9fs_vfs.h" 432bad8471SEric Van Hensbergen #include "conv.h" 442bad8471SEric Van Hensbergen #include "fid.h" 452bad8471SEric Van Hensbergen 462bad8471SEric Van Hensbergen static struct inode_operations v9fs_dir_inode_operations; 472bad8471SEric Van Hensbergen static struct inode_operations v9fs_file_inode_operations; 482bad8471SEric Van Hensbergen static struct inode_operations v9fs_symlink_inode_operations; 492bad8471SEric Van Hensbergen 502bad8471SEric Van Hensbergen /** 512bad8471SEric Van Hensbergen * unixmode2p9mode - convert unix mode bits to plan 9 522bad8471SEric Van Hensbergen * @v9ses: v9fs session information 532bad8471SEric Van Hensbergen * @mode: mode to convert 542bad8471SEric Van Hensbergen * 552bad8471SEric Van Hensbergen */ 562bad8471SEric Van Hensbergen 5773c592b9SEric Van Hensbergen static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) 582bad8471SEric Van Hensbergen { 592bad8471SEric Van Hensbergen int res; 602bad8471SEric Van Hensbergen res = mode & 0777; 612bad8471SEric Van Hensbergen if (S_ISDIR(mode)) 622bad8471SEric Van Hensbergen res |= V9FS_DMDIR; 632bad8471SEric Van Hensbergen if (v9ses->extended) { 642bad8471SEric Van Hensbergen if (S_ISLNK(mode)) 652bad8471SEric Van Hensbergen res |= V9FS_DMSYMLINK; 662bad8471SEric Van Hensbergen if (v9ses->nodev == 0) { 672bad8471SEric Van Hensbergen if (S_ISSOCK(mode)) 682bad8471SEric Van Hensbergen res |= V9FS_DMSOCKET; 692bad8471SEric Van Hensbergen if (S_ISFIFO(mode)) 702bad8471SEric Van Hensbergen res |= V9FS_DMNAMEDPIPE; 712bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 722bad8471SEric Van Hensbergen res |= V9FS_DMDEVICE; 732bad8471SEric Van Hensbergen if (S_ISCHR(mode)) 742bad8471SEric Van Hensbergen res |= V9FS_DMDEVICE; 752bad8471SEric Van Hensbergen } 762bad8471SEric Van Hensbergen 772bad8471SEric Van Hensbergen if ((mode & S_ISUID) == S_ISUID) 782bad8471SEric Van Hensbergen res |= V9FS_DMSETUID; 792bad8471SEric Van Hensbergen if ((mode & S_ISGID) == S_ISGID) 802bad8471SEric Van Hensbergen res |= V9FS_DMSETGID; 812bad8471SEric Van Hensbergen if ((mode & V9FS_DMLINK)) 822bad8471SEric Van Hensbergen res |= V9FS_DMLINK; 832bad8471SEric Van Hensbergen } 842bad8471SEric Van Hensbergen 852bad8471SEric Van Hensbergen return res; 862bad8471SEric Van Hensbergen } 872bad8471SEric Van Hensbergen 882bad8471SEric Van Hensbergen /** 892bad8471SEric Van Hensbergen * p9mode2unixmode- convert plan9 mode bits to unix mode bits 902bad8471SEric Van Hensbergen * @v9ses: v9fs session information 912bad8471SEric Van Hensbergen * @mode: mode to convert 922bad8471SEric Van Hensbergen * 932bad8471SEric Van Hensbergen */ 942bad8471SEric Van Hensbergen 9573c592b9SEric Van Hensbergen static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) 962bad8471SEric Van Hensbergen { 972bad8471SEric Van Hensbergen int res; 982bad8471SEric Van Hensbergen 992bad8471SEric Van Hensbergen res = mode & 0777; 1002bad8471SEric Van Hensbergen 1012bad8471SEric Van Hensbergen if ((mode & V9FS_DMDIR) == V9FS_DMDIR) 1022bad8471SEric Van Hensbergen res |= S_IFDIR; 1032bad8471SEric Van Hensbergen else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended)) 1042bad8471SEric Van Hensbergen res |= S_IFLNK; 1052bad8471SEric Van Hensbergen else if ((mode & V9FS_DMSOCKET) && (v9ses->extended) 1062bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1072bad8471SEric Van Hensbergen res |= S_IFSOCK; 1082bad8471SEric Van Hensbergen else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended) 1092bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1102bad8471SEric Van Hensbergen res |= S_IFIFO; 1112bad8471SEric Van Hensbergen else if ((mode & V9FS_DMDEVICE) && (v9ses->extended) 1122bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1132bad8471SEric Van Hensbergen res |= S_IFBLK; 1142bad8471SEric Van Hensbergen else 1152bad8471SEric Van Hensbergen res |= S_IFREG; 1162bad8471SEric Van Hensbergen 1172bad8471SEric Van Hensbergen if (v9ses->extended) { 1182bad8471SEric Van Hensbergen if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID) 1192bad8471SEric Van Hensbergen res |= S_ISUID; 1202bad8471SEric Van Hensbergen 1212bad8471SEric Van Hensbergen if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID) 1222bad8471SEric Van Hensbergen res |= S_ISGID; 1232bad8471SEric Van Hensbergen } 1242bad8471SEric Van Hensbergen 1252bad8471SEric Van Hensbergen return res; 1262bad8471SEric Van Hensbergen } 1272bad8471SEric Van Hensbergen 1282bad8471SEric Van Hensbergen /** 1292bad8471SEric Van Hensbergen * v9fs_blank_mistat - helper function to setup a 9P stat structure 1302bad8471SEric Van Hensbergen * @v9ses: 9P session info (for determining extended mode) 1312bad8471SEric Van Hensbergen * @mistat: structure to initialize 1322bad8471SEric Van Hensbergen * 1332bad8471SEric Van Hensbergen */ 1342bad8471SEric Van Hensbergen 13573c592b9SEric Van Hensbergen static void 1362bad8471SEric Van Hensbergen v9fs_blank_mistat(struct v9fs_session_info *v9ses, struct v9fs_stat *mistat) 1372bad8471SEric Van Hensbergen { 1382bad8471SEric Van Hensbergen mistat->type = ~0; 1392bad8471SEric Van Hensbergen mistat->dev = ~0; 1402bad8471SEric Van Hensbergen mistat->qid.type = ~0; 1412bad8471SEric Van Hensbergen mistat->qid.version = ~0; 1422bad8471SEric Van Hensbergen *((long long *)&mistat->qid.path) = ~0; 1432bad8471SEric Van Hensbergen mistat->mode = ~0; 1442bad8471SEric Van Hensbergen mistat->atime = ~0; 1452bad8471SEric Van Hensbergen mistat->mtime = ~0; 1462bad8471SEric Van Hensbergen mistat->length = ~0; 1472bad8471SEric Van Hensbergen mistat->name = mistat->data; 1482bad8471SEric Van Hensbergen mistat->uid = mistat->data; 1492bad8471SEric Van Hensbergen mistat->gid = mistat->data; 1502bad8471SEric Van Hensbergen mistat->muid = mistat->data; 1512bad8471SEric Van Hensbergen if (v9ses->extended) { 1522bad8471SEric Van Hensbergen mistat->n_uid = ~0; 1532bad8471SEric Van Hensbergen mistat->n_gid = ~0; 1542bad8471SEric Van Hensbergen mistat->n_muid = ~0; 1552bad8471SEric Van Hensbergen mistat->extension = mistat->data; 1562bad8471SEric Van Hensbergen } 1572bad8471SEric Van Hensbergen *mistat->data = 0; 1582bad8471SEric Van Hensbergen } 1592bad8471SEric Van Hensbergen 1602bad8471SEric Van Hensbergen /** 1612bad8471SEric Van Hensbergen * v9fs_mistat2unix - convert mistat to unix stat 1622bad8471SEric Van Hensbergen * @mistat: Plan 9 metadata (mistat) structure 16373c592b9SEric Van Hensbergen * @buf: unix metadata (stat) structure to populate 1642bad8471SEric Van Hensbergen * @sb: superblock 1652bad8471SEric Van Hensbergen * 1662bad8471SEric Van Hensbergen */ 1672bad8471SEric Van Hensbergen 1682bad8471SEric Van Hensbergen static void 1692bad8471SEric Van Hensbergen v9fs_mistat2unix(struct v9fs_stat *mistat, struct stat *buf, 1702bad8471SEric Van Hensbergen struct super_block *sb) 1712bad8471SEric Van Hensbergen { 1722bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = sb ? sb->s_fs_info : NULL; 1732bad8471SEric Van Hensbergen 1742bad8471SEric Van Hensbergen buf->st_nlink = 1; 1752bad8471SEric Van Hensbergen 1762bad8471SEric Van Hensbergen buf->st_atime = mistat->atime; 1772bad8471SEric Van Hensbergen buf->st_mtime = mistat->mtime; 1782bad8471SEric Van Hensbergen buf->st_ctime = mistat->mtime; 1792bad8471SEric Van Hensbergen 1802bad8471SEric Van Hensbergen buf->st_uid = (unsigned short)-1; 1812bad8471SEric Van Hensbergen buf->st_gid = (unsigned short)-1; 1822bad8471SEric Van Hensbergen 1832bad8471SEric Van Hensbergen if (v9ses && v9ses->extended) { 18473c592b9SEric Van Hensbergen /* TODO: string to uid mapping via user-space daemon */ 1852bad8471SEric Van Hensbergen if (mistat->n_uid != -1) 1862bad8471SEric Van Hensbergen sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid); 1872bad8471SEric Van Hensbergen 1882bad8471SEric Van Hensbergen if (mistat->n_gid != -1) 1892bad8471SEric Van Hensbergen sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid); 1902bad8471SEric Van Hensbergen } 1912bad8471SEric Van Hensbergen 1922bad8471SEric Van Hensbergen if (buf->st_uid == (unsigned short)-1) 1932bad8471SEric Van Hensbergen buf->st_uid = v9ses->uid; 1942bad8471SEric Van Hensbergen if (buf->st_gid == (unsigned short)-1) 1952bad8471SEric Van Hensbergen buf->st_gid = v9ses->gid; 1962bad8471SEric Van Hensbergen 1972bad8471SEric Van Hensbergen buf->st_mode = p9mode2unixmode(v9ses, mistat->mode); 1982bad8471SEric Van Hensbergen if ((S_ISBLK(buf->st_mode)) || (S_ISCHR(buf->st_mode))) { 1992bad8471SEric Van Hensbergen char type = 0; 2002bad8471SEric Van Hensbergen int major = -1; 2012bad8471SEric Van Hensbergen int minor = -1; 2022bad8471SEric Van Hensbergen sscanf(mistat->extension, "%c %u %u", &type, &major, &minor); 2032bad8471SEric Van Hensbergen switch (type) { 2042bad8471SEric Van Hensbergen case 'c': 2052bad8471SEric Van Hensbergen buf->st_mode &= ~S_IFBLK; 2062bad8471SEric Van Hensbergen buf->st_mode |= S_IFCHR; 2072bad8471SEric Van Hensbergen break; 2082bad8471SEric Van Hensbergen case 'b': 2092bad8471SEric Van Hensbergen break; 2102bad8471SEric Van Hensbergen default: 2112bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n", 2122bad8471SEric Van Hensbergen type, mistat->extension); 2132bad8471SEric Van Hensbergen }; 2142bad8471SEric Van Hensbergen buf->st_rdev = MKDEV(major, minor); 2152bad8471SEric Van Hensbergen } else 2162bad8471SEric Van Hensbergen buf->st_rdev = 0; 2172bad8471SEric Van Hensbergen 2182bad8471SEric Van Hensbergen buf->st_size = mistat->length; 2192bad8471SEric Van Hensbergen 2202bad8471SEric Van Hensbergen buf->st_blksize = sb->s_blocksize; 2212bad8471SEric Van Hensbergen buf->st_blocks = 2222bad8471SEric Van Hensbergen (buf->st_size + buf->st_blksize - 1) >> sb->s_blocksize_bits; 2232bad8471SEric Van Hensbergen } 2242bad8471SEric Van Hensbergen 2252bad8471SEric Van Hensbergen /** 2262bad8471SEric Van Hensbergen * v9fs_get_inode - helper function to setup an inode 2272bad8471SEric Van Hensbergen * @sb: superblock 2282bad8471SEric Van Hensbergen * @mode: mode to setup inode with 2292bad8471SEric Van Hensbergen * 2302bad8471SEric Van Hensbergen */ 2312bad8471SEric Van Hensbergen 2322bad8471SEric Van Hensbergen struct inode *v9fs_get_inode(struct super_block *sb, int mode) 2332bad8471SEric Van Hensbergen { 2342bad8471SEric Van Hensbergen struct inode *inode = NULL; 2352bad8471SEric Van Hensbergen 2362bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 2372bad8471SEric Van Hensbergen 2382bad8471SEric Van Hensbergen inode = new_inode(sb); 2392bad8471SEric Van Hensbergen if (inode) { 2402bad8471SEric Van Hensbergen inode->i_mode = mode; 2412bad8471SEric Van Hensbergen inode->i_uid = current->fsuid; 2422bad8471SEric Van Hensbergen inode->i_gid = current->fsgid; 2432bad8471SEric Van Hensbergen inode->i_blksize = sb->s_blocksize; 2442bad8471SEric Van Hensbergen inode->i_blocks = 0; 2452bad8471SEric Van Hensbergen inode->i_rdev = 0; 2462bad8471SEric Van Hensbergen inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2472bad8471SEric Van Hensbergen 2482bad8471SEric Van Hensbergen switch (mode & S_IFMT) { 2492bad8471SEric Van Hensbergen case S_IFIFO: 2502bad8471SEric Van Hensbergen case S_IFBLK: 2512bad8471SEric Van Hensbergen case S_IFCHR: 2522bad8471SEric Van Hensbergen case S_IFSOCK: 2535d58bec5SEric Van Hensbergen init_special_inode(inode, inode->i_mode, 2545d58bec5SEric Van Hensbergen inode->i_rdev); 2555d58bec5SEric Van Hensbergen break; 2562bad8471SEric Van Hensbergen case S_IFREG: 2572bad8471SEric Van Hensbergen inode->i_op = &v9fs_file_inode_operations; 2582bad8471SEric Van Hensbergen inode->i_fop = &v9fs_file_operations; 2592bad8471SEric Van Hensbergen break; 2602bad8471SEric Van Hensbergen case S_IFDIR: 2612bad8471SEric Van Hensbergen inode->i_nlink++; 2622bad8471SEric Van Hensbergen inode->i_op = &v9fs_dir_inode_operations; 2632bad8471SEric Van Hensbergen inode->i_fop = &v9fs_dir_operations; 2642bad8471SEric Van Hensbergen break; 2652bad8471SEric Van Hensbergen case S_IFLNK: 2662bad8471SEric Van Hensbergen inode->i_op = &v9fs_symlink_inode_operations; 2672bad8471SEric Van Hensbergen break; 2682bad8471SEric Van Hensbergen default: 2692bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 2702bad8471SEric Van Hensbergen mode, mode & S_IFMT); 2712bad8471SEric Van Hensbergen return ERR_PTR(-EINVAL); 2722bad8471SEric Van Hensbergen } 2732bad8471SEric Van Hensbergen } else { 2742bad8471SEric Van Hensbergen eprintk(KERN_WARNING, "Problem allocating inode\n"); 2752bad8471SEric Van Hensbergen return ERR_PTR(-ENOMEM); 2762bad8471SEric Van Hensbergen } 2772bad8471SEric Van Hensbergen return inode; 2782bad8471SEric Van Hensbergen } 2792bad8471SEric Van Hensbergen 2802bad8471SEric Van Hensbergen /** 2812bad8471SEric Van Hensbergen * v9fs_create - helper function to create files and directories 2822bad8471SEric Van Hensbergen * @dir: directory inode file is being created in 2832bad8471SEric Van Hensbergen * @file_dentry: dentry file is being created in 2842bad8471SEric Van Hensbergen * @perm: permissions file is being created with 28573c592b9SEric Van Hensbergen * @open_mode: resulting open mode for file 2862bad8471SEric Van Hensbergen * 2872bad8471SEric Van Hensbergen */ 2882bad8471SEric Van Hensbergen 2892bad8471SEric Van Hensbergen static int 2902bad8471SEric Van Hensbergen v9fs_create(struct inode *dir, 2912bad8471SEric Van Hensbergen struct dentry *file_dentry, 2922bad8471SEric Van Hensbergen unsigned int perm, unsigned int open_mode) 2932bad8471SEric Van Hensbergen { 2942bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 2952bad8471SEric Van Hensbergen struct super_block *sb = dir->i_sb; 2962bad8471SEric Van Hensbergen struct v9fs_fid *dirfid = 2972bad8471SEric Van Hensbergen v9fs_fid_lookup(file_dentry->d_parent, FID_WALK); 2982bad8471SEric Van Hensbergen struct v9fs_fid *fid = NULL; 2992bad8471SEric Van Hensbergen struct inode *file_inode = NULL; 3002bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 3012bad8471SEric Van Hensbergen struct v9fs_qid qid; 3022bad8471SEric Van Hensbergen struct stat newstat; 3032bad8471SEric Van Hensbergen int dirfidnum = -1; 3042bad8471SEric Van Hensbergen long newfid = -1; 3052bad8471SEric Van Hensbergen int result = 0; 3062bad8471SEric Van Hensbergen unsigned int iounit = 0; 3072bad8471SEric Van Hensbergen 3082bad8471SEric Van Hensbergen perm = unixmode2p9mode(v9ses, perm); 3092bad8471SEric Van Hensbergen 3102bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir, 3112bad8471SEric Van Hensbergen file_dentry, perm, open_mode); 3122bad8471SEric Van Hensbergen 3132bad8471SEric Van Hensbergen if (!dirfid) 3142bad8471SEric Van Hensbergen return -EBADF; 3152bad8471SEric Van Hensbergen 3162bad8471SEric Van Hensbergen dirfidnum = dirfid->fid; 3172bad8471SEric Van Hensbergen if (dirfidnum < 0) { 3182bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n", 3192bad8471SEric Van Hensbergen dir->i_ino); 3202bad8471SEric Van Hensbergen return -EBADF; 3212bad8471SEric Van Hensbergen } 3222bad8471SEric Van Hensbergen 3232bad8471SEric Van Hensbergen if (file_dentry->d_inode) { 3242bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, 3252bad8471SEric Van Hensbergen "Odd. There is an inode for dir %lu, name :%s:\n", 3262bad8471SEric Van Hensbergen dir->i_ino, file_dentry->d_name.name); 3272bad8471SEric Van Hensbergen return -EEXIST; 3282bad8471SEric Van Hensbergen } 3292bad8471SEric Van Hensbergen 3302bad8471SEric Van Hensbergen newfid = v9fs_get_idpool(&v9ses->fidpool); 3312bad8471SEric Van Hensbergen if (newfid < 0) { 3322bad8471SEric Van Hensbergen eprintk(KERN_WARNING, "no free fids available\n"); 3332bad8471SEric Van Hensbergen return -ENOSPC; 3342bad8471SEric Van Hensbergen } 3352bad8471SEric Van Hensbergen 3362bad8471SEric Van Hensbergen result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall); 3372bad8471SEric Van Hensbergen if (result < 0) { 3382bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall)); 3392bad8471SEric Van Hensbergen v9fs_put_idpool(newfid, &v9ses->fidpool); 3402bad8471SEric Van Hensbergen newfid = 0; 3412bad8471SEric Van Hensbergen goto CleanUpFid; 3422bad8471SEric Van Hensbergen } 3432bad8471SEric Van Hensbergen 3442bad8471SEric Van Hensbergen kfree(fcall); 3452bad8471SEric Van Hensbergen 3462bad8471SEric Van Hensbergen result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name, 3472bad8471SEric Van Hensbergen perm, open_mode, &fcall); 3482bad8471SEric Van Hensbergen if (result < 0) { 3492bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "create fails: %s(%d)\n", 3502bad8471SEric Van Hensbergen FCALL_ERROR(fcall), result); 3512bad8471SEric Van Hensbergen 3522bad8471SEric Van Hensbergen goto CleanUpFid; 3532bad8471SEric Van Hensbergen } 3542bad8471SEric Van Hensbergen 3552bad8471SEric Van Hensbergen iounit = fcall->params.rcreate.iounit; 3562bad8471SEric Van Hensbergen qid = fcall->params.rcreate.qid; 3572bad8471SEric Van Hensbergen kfree(fcall); 3582bad8471SEric Van Hensbergen 3592bad8471SEric Van Hensbergen fid = v9fs_fid_create(file_dentry); 3602bad8471SEric Van Hensbergen if (!fid) { 3612bad8471SEric Van Hensbergen result = -ENOMEM; 3622bad8471SEric Van Hensbergen goto CleanUpFid; 3632bad8471SEric Van Hensbergen } 3642bad8471SEric Van Hensbergen 3652bad8471SEric Van Hensbergen fid->fid = newfid; 3662bad8471SEric Van Hensbergen fid->fidopen = 0; 3672bad8471SEric Van Hensbergen fid->fidcreate = 1; 3682bad8471SEric Van Hensbergen fid->qid = qid; 3692bad8471SEric Van Hensbergen fid->iounit = iounit; 3702bad8471SEric Van Hensbergen fid->rdir_pos = 0; 3712bad8471SEric Van Hensbergen fid->rdir_fcall = NULL; 3722bad8471SEric Van Hensbergen fid->v9ses = v9ses; 3732bad8471SEric Van Hensbergen 3742bad8471SEric Van Hensbergen if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) || 3752bad8471SEric Van Hensbergen (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) || 3762bad8471SEric Van Hensbergen (perm & V9FS_DMDEVICE)) 3772bad8471SEric Van Hensbergen return 0; 3782bad8471SEric Van Hensbergen 3792bad8471SEric Van Hensbergen result = v9fs_t_stat(v9ses, newfid, &fcall); 3802bad8471SEric Van Hensbergen if (result < 0) { 3812bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "stat error: %s(%d)\n", FCALL_ERROR(fcall), 3822bad8471SEric Van Hensbergen result); 3832bad8471SEric Van Hensbergen goto CleanUpFid; 3842bad8471SEric Van Hensbergen } 3852bad8471SEric Van Hensbergen 3862bad8471SEric Van Hensbergen v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); 3872bad8471SEric Van Hensbergen 3882bad8471SEric Van Hensbergen file_inode = v9fs_get_inode(sb, newstat.st_mode); 3892bad8471SEric Van Hensbergen if ((!file_inode) || IS_ERR(file_inode)) { 3902bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "create inode failed\n"); 3912bad8471SEric Van Hensbergen result = -EBADF; 3922bad8471SEric Van Hensbergen goto CleanUpFid; 3932bad8471SEric Van Hensbergen } 3942bad8471SEric Van Hensbergen 3952bad8471SEric Van Hensbergen v9fs_mistat2inode(fcall->params.rstat.stat, file_inode, sb); 3962bad8471SEric Van Hensbergen kfree(fcall); 3972bad8471SEric Van Hensbergen d_instantiate(file_dentry, file_inode); 3982bad8471SEric Van Hensbergen 3992bad8471SEric Van Hensbergen if (perm & V9FS_DMDIR) { 4002bad8471SEric Van Hensbergen if (v9fs_t_clunk(v9ses, newfid, &fcall)) 4012bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n", 4022bad8471SEric Van Hensbergen FCALL_ERROR(fcall)); 4032bad8471SEric Van Hensbergen 4042bad8471SEric Van Hensbergen v9fs_put_idpool(newfid, &v9ses->fidpool); 4052bad8471SEric Van Hensbergen kfree(fcall); 4062bad8471SEric Van Hensbergen fid->fidopen = 0; 4072bad8471SEric Van Hensbergen fid->fidcreate = 0; 4082bad8471SEric Van Hensbergen d_drop(file_dentry); 4092bad8471SEric Van Hensbergen } 4102bad8471SEric Van Hensbergen 4112bad8471SEric Van Hensbergen return 0; 4122bad8471SEric Van Hensbergen 4132bad8471SEric Van Hensbergen CleanUpFid: 4142bad8471SEric Van Hensbergen kfree(fcall); 4152bad8471SEric Van Hensbergen 4162bad8471SEric Van Hensbergen if (newfid) { 4172bad8471SEric Van Hensbergen if (v9fs_t_clunk(v9ses, newfid, &fcall)) 4182bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "clunk failed: %s\n", 4192bad8471SEric Van Hensbergen FCALL_ERROR(fcall)); 4202bad8471SEric Van Hensbergen 4212bad8471SEric Van Hensbergen v9fs_put_idpool(newfid, &v9ses->fidpool); 4222bad8471SEric Van Hensbergen kfree(fcall); 4232bad8471SEric Van Hensbergen } 4242bad8471SEric Van Hensbergen return result; 4252bad8471SEric Van Hensbergen } 4262bad8471SEric Van Hensbergen 4272bad8471SEric Van Hensbergen /** 4282bad8471SEric Van Hensbergen * v9fs_remove - helper function to remove files and directories 42973c592b9SEric Van Hensbergen * @dir: directory inode that is being deleted 43073c592b9SEric Van Hensbergen * @file: dentry that is being deleted 43173c592b9SEric Van Hensbergen * @rmdir: removing a directory 4322bad8471SEric Van Hensbergen * 4332bad8471SEric Van Hensbergen */ 4342bad8471SEric Van Hensbergen 4352bad8471SEric Van Hensbergen static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) 4362bad8471SEric Van Hensbergen { 4372bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 4382bad8471SEric Van Hensbergen struct super_block *sb = NULL; 4392bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = NULL; 4402bad8471SEric Van Hensbergen struct v9fs_fid *v9fid = NULL; 4412bad8471SEric Van Hensbergen struct inode *file_inode = NULL; 4422bad8471SEric Van Hensbergen int fid = -1; 4432bad8471SEric Van Hensbergen int result = 0; 4442bad8471SEric Van Hensbergen 4452bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, 4462bad8471SEric Van Hensbergen rmdir); 4472bad8471SEric Van Hensbergen 4482bad8471SEric Van Hensbergen file_inode = file->d_inode; 4492bad8471SEric Van Hensbergen sb = file_inode->i_sb; 4502bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(file_inode); 4512bad8471SEric Van Hensbergen v9fid = v9fs_fid_lookup(file, FID_OP); 4522bad8471SEric Van Hensbergen 4532bad8471SEric Van Hensbergen if (!v9fid) { 4542bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, 4552bad8471SEric Van Hensbergen "no v9fs_fid\n"); 4562bad8471SEric Van Hensbergen return -EBADF; 4572bad8471SEric Van Hensbergen } 4582bad8471SEric Van Hensbergen 4592bad8471SEric Van Hensbergen fid = v9fid->fid; 4602bad8471SEric Van Hensbergen if (fid < 0) { 4612bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n", 4622bad8471SEric Van Hensbergen file_inode->i_ino); 4632bad8471SEric Van Hensbergen return -EBADF; 4642bad8471SEric Van Hensbergen } 4652bad8471SEric Van Hensbergen 4662bad8471SEric Van Hensbergen result = v9fs_t_remove(v9ses, fid, &fcall); 4672bad8471SEric Van Hensbergen if (result < 0) 4682bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n", 4692bad8471SEric Van Hensbergen FCALL_ERROR(fcall), result); 4702bad8471SEric Van Hensbergen else { 4712bad8471SEric Van Hensbergen v9fs_put_idpool(fid, &v9ses->fidpool); 4722bad8471SEric Van Hensbergen v9fs_fid_destroy(v9fid); 4732bad8471SEric Van Hensbergen } 4742bad8471SEric Van Hensbergen 4752bad8471SEric Van Hensbergen kfree(fcall); 4762bad8471SEric Van Hensbergen return result; 4772bad8471SEric Van Hensbergen } 4782bad8471SEric Van Hensbergen 4792bad8471SEric Van Hensbergen /** 4802bad8471SEric Van Hensbergen * v9fs_vfs_create - VFS hook to create files 4812bad8471SEric Van Hensbergen * @inode: directory inode that is being deleted 4822bad8471SEric Van Hensbergen * @dentry: dentry that is being deleted 4832bad8471SEric Van Hensbergen * @perm: create permissions 4842bad8471SEric Van Hensbergen * @nd: path information 4852bad8471SEric Van Hensbergen * 4862bad8471SEric Van Hensbergen */ 4872bad8471SEric Van Hensbergen 4882bad8471SEric Van Hensbergen static int 4892bad8471SEric Van Hensbergen v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm, 4902bad8471SEric Van Hensbergen struct nameidata *nd) 4912bad8471SEric Van Hensbergen { 4922bad8471SEric Van Hensbergen return v9fs_create(inode, dentry, perm, O_RDWR); 4932bad8471SEric Van Hensbergen } 4942bad8471SEric Van Hensbergen 4952bad8471SEric Van Hensbergen /** 4962bad8471SEric Van Hensbergen * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 49773c592b9SEric Van Hensbergen * @inode: inode that is being unlinked 4982bad8471SEric Van Hensbergen * @dentry: dentry that is being unlinked 4992bad8471SEric Van Hensbergen * @mode: mode for new directory 5002bad8471SEric Van Hensbergen * 5012bad8471SEric Van Hensbergen */ 5022bad8471SEric Van Hensbergen 5032bad8471SEric Van Hensbergen static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode) 5042bad8471SEric Van Hensbergen { 5052bad8471SEric Van Hensbergen return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY); 5062bad8471SEric Van Hensbergen } 5072bad8471SEric Van Hensbergen 5082bad8471SEric Van Hensbergen /** 5092bad8471SEric Van Hensbergen * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 5102bad8471SEric Van Hensbergen * @dir: inode that is being walked from 5112bad8471SEric Van Hensbergen * @dentry: dentry that is being walked to? 5122bad8471SEric Van Hensbergen * @nameidata: path data 5132bad8471SEric Van Hensbergen * 5142bad8471SEric Van Hensbergen */ 5152bad8471SEric Van Hensbergen 5162bad8471SEric Van Hensbergen static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 5172bad8471SEric Van Hensbergen struct nameidata *nameidata) 5182bad8471SEric Van Hensbergen { 5192bad8471SEric Van Hensbergen struct super_block *sb; 5202bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses; 5212bad8471SEric Van Hensbergen struct v9fs_fid *dirfid; 5222bad8471SEric Van Hensbergen struct v9fs_fid *fid; 5232bad8471SEric Van Hensbergen struct inode *inode; 5242bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 5252bad8471SEric Van Hensbergen struct stat newstat; 5262bad8471SEric Van Hensbergen int dirfidnum = -1; 5272bad8471SEric Van Hensbergen int newfid = -1; 5282bad8471SEric Van Hensbergen int result = 0; 5292bad8471SEric Van Hensbergen 5302bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 5312bad8471SEric Van Hensbergen dir, dentry->d_iname, dentry, nameidata); 5322bad8471SEric Van Hensbergen 5332bad8471SEric Van Hensbergen sb = dir->i_sb; 5342bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(dir); 5352bad8471SEric Van Hensbergen dirfid = v9fs_fid_lookup(dentry->d_parent, FID_WALK); 5362bad8471SEric Van Hensbergen 5372bad8471SEric Van Hensbergen if (!dirfid) { 5382bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "no dirfid\n"); 5392bad8471SEric Van Hensbergen return ERR_PTR(-EINVAL); 5402bad8471SEric Van Hensbergen } 5412bad8471SEric Van Hensbergen 5422bad8471SEric Van Hensbergen dirfidnum = dirfid->fid; 5432bad8471SEric Van Hensbergen 5442bad8471SEric Van Hensbergen if (dirfidnum < 0) { 5452bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n", 5462bad8471SEric Van Hensbergen dir, dir->i_ino); 5472bad8471SEric Van Hensbergen return ERR_PTR(-EBADF); 5482bad8471SEric Van Hensbergen } 5492bad8471SEric Van Hensbergen 5502bad8471SEric Van Hensbergen newfid = v9fs_get_idpool(&v9ses->fidpool); 5512bad8471SEric Van Hensbergen if (newfid < 0) { 5522bad8471SEric Van Hensbergen eprintk(KERN_WARNING, "newfid fails!\n"); 5532bad8471SEric Van Hensbergen return ERR_PTR(-ENOSPC); 5542bad8471SEric Van Hensbergen } 5552bad8471SEric Van Hensbergen 5562bad8471SEric Van Hensbergen result = 5572bad8471SEric Van Hensbergen v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name, 5582bad8471SEric Van Hensbergen NULL); 5592bad8471SEric Van Hensbergen if (result < 0) { 5602bad8471SEric Van Hensbergen v9fs_put_idpool(newfid, &v9ses->fidpool); 5612bad8471SEric Van Hensbergen if (result == -ENOENT) { 5622bad8471SEric Van Hensbergen d_add(dentry, NULL); 5632bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, 5642bad8471SEric Van Hensbergen "Return negative dentry %p count %d\n", 5652bad8471SEric Van Hensbergen dentry, atomic_read(&dentry->d_count)); 5662bad8471SEric Van Hensbergen return NULL; 5672bad8471SEric Van Hensbergen } 5682bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "walk error:%d\n", result); 5692bad8471SEric Van Hensbergen goto FreeFcall; 5702bad8471SEric Van Hensbergen } 5712bad8471SEric Van Hensbergen 5722bad8471SEric Van Hensbergen result = v9fs_t_stat(v9ses, newfid, &fcall); 5732bad8471SEric Van Hensbergen if (result < 0) { 5742bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "stat error\n"); 5752bad8471SEric Van Hensbergen goto FreeFcall; 5762bad8471SEric Van Hensbergen } 5772bad8471SEric Van Hensbergen 5782bad8471SEric Van Hensbergen v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb); 5792bad8471SEric Van Hensbergen inode = v9fs_get_inode(sb, newstat.st_mode); 5802bad8471SEric Van Hensbergen 5812bad8471SEric Van Hensbergen if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) { 5822bad8471SEric Van Hensbergen eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n", 5832bad8471SEric Van Hensbergen PTR_ERR(inode)); 5842bad8471SEric Van Hensbergen 5852bad8471SEric Van Hensbergen result = -ENOSPC; 5862bad8471SEric Van Hensbergen goto FreeFcall; 5872bad8471SEric Van Hensbergen } 5882bad8471SEric Van Hensbergen 5892bad8471SEric Van Hensbergen inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat->qid); 5902bad8471SEric Van Hensbergen 5912bad8471SEric Van Hensbergen fid = v9fs_fid_create(dentry); 5922bad8471SEric Van Hensbergen if (fid == NULL) { 5932bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "couldn't insert\n"); 5942bad8471SEric Van Hensbergen result = -ENOMEM; 5952bad8471SEric Van Hensbergen goto FreeFcall; 5962bad8471SEric Van Hensbergen } 5972bad8471SEric Van Hensbergen 5982bad8471SEric Van Hensbergen fid->fid = newfid; 5992bad8471SEric Van Hensbergen fid->fidopen = 0; 6002bad8471SEric Van Hensbergen fid->v9ses = v9ses; 6012bad8471SEric Van Hensbergen fid->qid = fcall->params.rstat.stat->qid; 6022bad8471SEric Van Hensbergen 6032bad8471SEric Van Hensbergen dentry->d_op = &v9fs_dentry_operations; 6042bad8471SEric Van Hensbergen v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb); 6052bad8471SEric Van Hensbergen 6062bad8471SEric Van Hensbergen d_add(dentry, inode); 6072bad8471SEric Van Hensbergen kfree(fcall); 6082bad8471SEric Van Hensbergen 6092bad8471SEric Van Hensbergen return NULL; 6102bad8471SEric Van Hensbergen 6112bad8471SEric Van Hensbergen FreeFcall: 6122bad8471SEric Van Hensbergen kfree(fcall); 6132bad8471SEric Van Hensbergen return ERR_PTR(result); 6142bad8471SEric Van Hensbergen } 6152bad8471SEric Van Hensbergen 6162bad8471SEric Van Hensbergen /** 6172bad8471SEric Van Hensbergen * v9fs_vfs_unlink - VFS unlink hook to delete an inode 6182bad8471SEric Van Hensbergen * @i: inode that is being unlinked 61973c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 6202bad8471SEric Van Hensbergen * 6212bad8471SEric Van Hensbergen */ 6222bad8471SEric Van Hensbergen 6232bad8471SEric Van Hensbergen static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 6242bad8471SEric Van Hensbergen { 6252bad8471SEric Van Hensbergen return v9fs_remove(i, d, 0); 6262bad8471SEric Van Hensbergen } 6272bad8471SEric Van Hensbergen 6282bad8471SEric Van Hensbergen /** 6292bad8471SEric Van Hensbergen * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 6302bad8471SEric Van Hensbergen * @i: inode that is being unlinked 63173c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 6322bad8471SEric Van Hensbergen * 6332bad8471SEric Van Hensbergen */ 6342bad8471SEric Van Hensbergen 6352bad8471SEric Van Hensbergen static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 6362bad8471SEric Van Hensbergen { 6372bad8471SEric Van Hensbergen return v9fs_remove(i, d, 1); 6382bad8471SEric Van Hensbergen } 6392bad8471SEric Van Hensbergen 6402bad8471SEric Van Hensbergen /** 6412bad8471SEric Van Hensbergen * v9fs_vfs_rename - VFS hook to rename an inode 6422bad8471SEric Van Hensbergen * @old_dir: old dir inode 6432bad8471SEric Van Hensbergen * @old_dentry: old dentry 6442bad8471SEric Van Hensbergen * @new_dir: new dir inode 6452bad8471SEric Van Hensbergen * @new_dentry: new dentry 6462bad8471SEric Van Hensbergen * 6472bad8471SEric Van Hensbergen */ 6482bad8471SEric Van Hensbergen 6492bad8471SEric Van Hensbergen static int 6502bad8471SEric Van Hensbergen v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 6512bad8471SEric Van Hensbergen struct inode *new_dir, struct dentry *new_dentry) 6522bad8471SEric Van Hensbergen { 6532bad8471SEric Van Hensbergen struct inode *old_inode = old_dentry->d_inode; 6542bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode); 6552bad8471SEric Van Hensbergen struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_WALK); 6562bad8471SEric Van Hensbergen struct v9fs_fid *olddirfid = 6572bad8471SEric Van Hensbergen v9fs_fid_lookup(old_dentry->d_parent, FID_WALK); 6582bad8471SEric Van Hensbergen struct v9fs_fid *newdirfid = 6592bad8471SEric Van Hensbergen v9fs_fid_lookup(new_dentry->d_parent, FID_WALK); 6602bad8471SEric Van Hensbergen struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); 6612bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 6622bad8471SEric Van Hensbergen int fid = -1; 6632bad8471SEric Van Hensbergen int olddirfidnum = -1; 6642bad8471SEric Van Hensbergen int newdirfidnum = -1; 6652bad8471SEric Van Hensbergen int retval = 0; 6662bad8471SEric Van Hensbergen 6672bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, "\n"); 6682bad8471SEric Van Hensbergen 66973c592b9SEric Van Hensbergen if (!mistat) 67073c592b9SEric Van Hensbergen return -ENOMEM; 67173c592b9SEric Van Hensbergen 6722bad8471SEric Van Hensbergen if ((!oldfid) || (!olddirfid) || (!newdirfid)) { 6732bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "problem with arguments\n"); 6742bad8471SEric Van Hensbergen return -EBADF; 6752bad8471SEric Van Hensbergen } 6762bad8471SEric Van Hensbergen 6772bad8471SEric Van Hensbergen /* 9P can only handle file rename in the same directory */ 6782bad8471SEric Van Hensbergen if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { 6792bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "old dir and new dir are different\n"); 6802bad8471SEric Van Hensbergen retval = -EPERM; 6812bad8471SEric Van Hensbergen goto FreeFcallnBail; 6822bad8471SEric Van Hensbergen } 6832bad8471SEric Van Hensbergen 6842bad8471SEric Van Hensbergen fid = oldfid->fid; 6852bad8471SEric Van Hensbergen olddirfidnum = olddirfid->fid; 6862bad8471SEric Van Hensbergen newdirfidnum = newdirfid->fid; 6872bad8471SEric Van Hensbergen 6882bad8471SEric Van Hensbergen if (fid < 0) { 6892bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "no fid for old file #%lu\n", 6902bad8471SEric Van Hensbergen old_inode->i_ino); 6912bad8471SEric Van Hensbergen retval = -EBADF; 6922bad8471SEric Van Hensbergen goto FreeFcallnBail; 6932bad8471SEric Van Hensbergen } 6942bad8471SEric Van Hensbergen 6952bad8471SEric Van Hensbergen v9fs_blank_mistat(v9ses, mistat); 6962bad8471SEric Van Hensbergen 6972bad8471SEric Van Hensbergen strcpy(mistat->data + 1, v9ses->name); 6982bad8471SEric Van Hensbergen mistat->name = mistat->data + 1 + strlen(v9ses->name); 6992bad8471SEric Van Hensbergen 7002bad8471SEric Van Hensbergen if (new_dentry->d_name.len > 7012bad8471SEric Van Hensbergen (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) { 7022bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "new name too long\n"); 7032bad8471SEric Van Hensbergen goto FreeFcallnBail; 7042bad8471SEric Van Hensbergen } 7052bad8471SEric Van Hensbergen 7062bad8471SEric Van Hensbergen strcpy(mistat->name, new_dentry->d_name.name); 7072bad8471SEric Van Hensbergen retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall); 7082bad8471SEric Van Hensbergen 7092bad8471SEric Van Hensbergen FreeFcallnBail: 7102bad8471SEric Van Hensbergen kfree(mistat); 7112bad8471SEric Van Hensbergen 7122bad8471SEric Van Hensbergen if (retval < 0) 7132bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", 7142bad8471SEric Van Hensbergen FCALL_ERROR(fcall)); 7152bad8471SEric Van Hensbergen 7162bad8471SEric Van Hensbergen kfree(fcall); 7172bad8471SEric Van Hensbergen return retval; 7182bad8471SEric Van Hensbergen } 7192bad8471SEric Van Hensbergen 7202bad8471SEric Van Hensbergen /** 7212bad8471SEric Van Hensbergen * v9fs_vfs_getattr - retreive file metadata 7222bad8471SEric Van Hensbergen * @mnt - mount information 7232bad8471SEric Van Hensbergen * @dentry - file to get attributes on 7242bad8471SEric Van Hensbergen * @stat - metadata structure to populate 7252bad8471SEric Van Hensbergen * 7262bad8471SEric Van Hensbergen */ 7272bad8471SEric Van Hensbergen 7282bad8471SEric Van Hensbergen static int 7292bad8471SEric Van Hensbergen v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 7302bad8471SEric Van Hensbergen struct kstat *stat) 7312bad8471SEric Van Hensbergen { 7322bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 7332bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); 7342bad8471SEric Van Hensbergen struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP); 7352bad8471SEric Van Hensbergen int err = -EPERM; 7362bad8471SEric Van Hensbergen 7372bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, "dentry: %p\n", dentry); 7382bad8471SEric Van Hensbergen if (!fid) { 7392bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, 7402bad8471SEric Van Hensbergen "couldn't find fid associated with dentry\n"); 7412bad8471SEric Van Hensbergen return -EBADF; 7422bad8471SEric Van Hensbergen } 7432bad8471SEric Van Hensbergen 7442bad8471SEric Van Hensbergen err = v9fs_t_stat(v9ses, fid->fid, &fcall); 7452bad8471SEric Van Hensbergen 7462bad8471SEric Van Hensbergen if (err < 0) 7472bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "stat error\n"); 7482bad8471SEric Van Hensbergen else { 7492bad8471SEric Van Hensbergen v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode, 7502bad8471SEric Van Hensbergen dentry->d_inode->i_sb); 7512bad8471SEric Van Hensbergen generic_fillattr(dentry->d_inode, stat); 7522bad8471SEric Van Hensbergen } 7532bad8471SEric Van Hensbergen 7542bad8471SEric Van Hensbergen kfree(fcall); 7552bad8471SEric Van Hensbergen return err; 7562bad8471SEric Van Hensbergen } 7572bad8471SEric Van Hensbergen 7582bad8471SEric Van Hensbergen /** 7592bad8471SEric Van Hensbergen * v9fs_vfs_setattr - set file metadata 7602bad8471SEric Van Hensbergen * @dentry: file whose metadata to set 7612bad8471SEric Van Hensbergen * @iattr: metadata assignment structure 7622bad8471SEric Van Hensbergen * 7632bad8471SEric Van Hensbergen */ 7642bad8471SEric Van Hensbergen 7652bad8471SEric Van Hensbergen static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 7662bad8471SEric Van Hensbergen { 7672bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); 7682bad8471SEric Van Hensbergen struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP); 7692bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 77073c592b9SEric Van Hensbergen struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); 7712bad8471SEric Van Hensbergen int res = -EPERM; 7722bad8471SEric Van Hensbergen 7732bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, "\n"); 77473c592b9SEric Van Hensbergen 77573c592b9SEric Van Hensbergen if (!mistat) 77673c592b9SEric Van Hensbergen return -ENOMEM; 77773c592b9SEric Van Hensbergen 7782bad8471SEric Van Hensbergen if (!fid) { 7792bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, 7802bad8471SEric Van Hensbergen "Couldn't find fid associated with dentry\n"); 7812bad8471SEric Van Hensbergen return -EBADF; 7822bad8471SEric Van Hensbergen } 7832bad8471SEric Van Hensbergen 7842bad8471SEric Van Hensbergen v9fs_blank_mistat(v9ses, mistat); 7852bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MODE) 7862bad8471SEric Van Hensbergen mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode); 7872bad8471SEric Van Hensbergen 7882bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MTIME) 7892bad8471SEric Van Hensbergen mistat->mtime = iattr->ia_mtime.tv_sec; 7902bad8471SEric Van Hensbergen 7912bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_ATIME) 7922bad8471SEric Van Hensbergen mistat->atime = iattr->ia_atime.tv_sec; 7932bad8471SEric Van Hensbergen 7942bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_SIZE) 7952bad8471SEric Van Hensbergen mistat->length = iattr->ia_size; 7962bad8471SEric Van Hensbergen 7972bad8471SEric Van Hensbergen if (v9ses->extended) { 79873c592b9SEric Van Hensbergen char *ptr = mistat->data+1; 7992bad8471SEric Van Hensbergen 8002bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_UID) { 80173c592b9SEric Van Hensbergen mistat->uid = ptr; 80273c592b9SEric Van Hensbergen ptr += 1+sprintf(ptr, "%08x", iattr->ia_uid); 8032bad8471SEric Van Hensbergen mistat->n_uid = iattr->ia_uid; 8042bad8471SEric Van Hensbergen } 8052bad8471SEric Van Hensbergen 8062bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_GID) { 80773c592b9SEric Van Hensbergen mistat->gid = ptr; 80873c592b9SEric Van Hensbergen ptr += 1+sprintf(ptr, "%08x", iattr->ia_gid); 8092bad8471SEric Van Hensbergen mistat->n_gid = iattr->ia_gid; 8102bad8471SEric Van Hensbergen } 8112bad8471SEric Van Hensbergen } 8122bad8471SEric Van Hensbergen 8132bad8471SEric Van Hensbergen res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall); 8142bad8471SEric Van Hensbergen 8152bad8471SEric Van Hensbergen if (res < 0) 8162bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall)); 8172bad8471SEric Van Hensbergen 8182bad8471SEric Van Hensbergen kfree(mistat); 8192bad8471SEric Van Hensbergen kfree(fcall); 8202bad8471SEric Van Hensbergen 8212bad8471SEric Van Hensbergen if (res >= 0) 8222bad8471SEric Van Hensbergen res = inode_setattr(dentry->d_inode, iattr); 8232bad8471SEric Van Hensbergen 8242bad8471SEric Van Hensbergen return res; 8252bad8471SEric Van Hensbergen } 8262bad8471SEric Van Hensbergen 8272bad8471SEric Van Hensbergen /** 8282bad8471SEric Van Hensbergen * v9fs_mistat2inode - populate an inode structure with mistat info 8292bad8471SEric Van Hensbergen * @mistat: Plan 9 metadata (mistat) structure 8302bad8471SEric Van Hensbergen * @inode: inode to populate 8312bad8471SEric Van Hensbergen * @sb: superblock of filesystem 8322bad8471SEric Van Hensbergen * 8332bad8471SEric Van Hensbergen */ 8342bad8471SEric Van Hensbergen 8352bad8471SEric Van Hensbergen void 8362bad8471SEric Van Hensbergen v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode, 8372bad8471SEric Van Hensbergen struct super_block *sb) 8382bad8471SEric Van Hensbergen { 8392bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 8402bad8471SEric Van Hensbergen 8412bad8471SEric Van Hensbergen inode->i_nlink = 1; 8422bad8471SEric Van Hensbergen 8432bad8471SEric Van Hensbergen inode->i_atime.tv_sec = mistat->atime; 8442bad8471SEric Van Hensbergen inode->i_mtime.tv_sec = mistat->mtime; 8452bad8471SEric Van Hensbergen inode->i_ctime.tv_sec = mistat->mtime; 8462bad8471SEric Van Hensbergen 8472bad8471SEric Van Hensbergen inode->i_uid = -1; 8482bad8471SEric Van Hensbergen inode->i_gid = -1; 8492bad8471SEric Van Hensbergen 8502bad8471SEric Van Hensbergen if (v9ses->extended) { 8512bad8471SEric Van Hensbergen /* TODO: string to uid mapping via user-space daemon */ 8522bad8471SEric Van Hensbergen inode->i_uid = mistat->n_uid; 8532bad8471SEric Van Hensbergen inode->i_gid = mistat->n_gid; 8542bad8471SEric Van Hensbergen 8552bad8471SEric Van Hensbergen if (mistat->n_uid == -1) 8562bad8471SEric Van Hensbergen sscanf(mistat->uid, "%x", &inode->i_uid); 8572bad8471SEric Van Hensbergen 8582bad8471SEric Van Hensbergen if (mistat->n_gid == -1) 8592bad8471SEric Van Hensbergen sscanf(mistat->gid, "%x", &inode->i_gid); 8602bad8471SEric Van Hensbergen } 8612bad8471SEric Van Hensbergen 8622bad8471SEric Van Hensbergen if (inode->i_uid == -1) 8632bad8471SEric Van Hensbergen inode->i_uid = v9ses->uid; 8642bad8471SEric Van Hensbergen if (inode->i_gid == -1) 8652bad8471SEric Van Hensbergen inode->i_gid = v9ses->gid; 8662bad8471SEric Van Hensbergen 8672bad8471SEric Van Hensbergen inode->i_mode = p9mode2unixmode(v9ses, mistat->mode); 8682bad8471SEric Van Hensbergen if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 8692bad8471SEric Van Hensbergen char type = 0; 8702bad8471SEric Van Hensbergen int major = -1; 8712bad8471SEric Van Hensbergen int minor = -1; 8722bad8471SEric Van Hensbergen sscanf(mistat->extension, "%c %u %u", &type, &major, &minor); 8732bad8471SEric Van Hensbergen switch (type) { 8742bad8471SEric Van Hensbergen case 'c': 8752bad8471SEric Van Hensbergen inode->i_mode &= ~S_IFBLK; 8762bad8471SEric Van Hensbergen inode->i_mode |= S_IFCHR; 8772bad8471SEric Van Hensbergen break; 8782bad8471SEric Van Hensbergen case 'b': 8792bad8471SEric Van Hensbergen break; 8802bad8471SEric Van Hensbergen default: 8812bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n", 8822bad8471SEric Van Hensbergen type, mistat->extension); 8832bad8471SEric Van Hensbergen }; 8842bad8471SEric Van Hensbergen inode->i_rdev = MKDEV(major, minor); 8852bad8471SEric Van Hensbergen } else 8862bad8471SEric Van Hensbergen inode->i_rdev = 0; 8872bad8471SEric Van Hensbergen 8882bad8471SEric Van Hensbergen inode->i_size = mistat->length; 8892bad8471SEric Van Hensbergen 8902bad8471SEric Van Hensbergen inode->i_blksize = sb->s_blocksize; 8912bad8471SEric Van Hensbergen inode->i_blocks = 8922bad8471SEric Van Hensbergen (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits; 8932bad8471SEric Van Hensbergen } 8942bad8471SEric Van Hensbergen 8952bad8471SEric Van Hensbergen /** 8962bad8471SEric Van Hensbergen * v9fs_qid2ino - convert qid into inode number 8972bad8471SEric Van Hensbergen * @qid: qid to hash 8982bad8471SEric Van Hensbergen * 8992bad8471SEric Van Hensbergen * BUG: potential for inode number collisions? 9002bad8471SEric Van Hensbergen */ 9012bad8471SEric Van Hensbergen 9022bad8471SEric Van Hensbergen ino_t v9fs_qid2ino(struct v9fs_qid *qid) 9032bad8471SEric Van Hensbergen { 9042bad8471SEric Van Hensbergen u64 path = qid->path + 2; 9052bad8471SEric Van Hensbergen ino_t i = 0; 9062bad8471SEric Van Hensbergen 9072bad8471SEric Van Hensbergen if (sizeof(ino_t) == sizeof(path)) 9082bad8471SEric Van Hensbergen memcpy(&i, &path, sizeof(ino_t)); 9092bad8471SEric Van Hensbergen else 9102bad8471SEric Van Hensbergen i = (ino_t) (path ^ (path >> 32)); 9112bad8471SEric Van Hensbergen 9122bad8471SEric Van Hensbergen return i; 9132bad8471SEric Van Hensbergen } 9142bad8471SEric Van Hensbergen 9152bad8471SEric Van Hensbergen /** 9162bad8471SEric Van Hensbergen * v9fs_vfs_symlink - helper function to create symlinks 9172bad8471SEric Van Hensbergen * @dir: directory inode containing symlink 9182bad8471SEric Van Hensbergen * @dentry: dentry for symlink 9192bad8471SEric Van Hensbergen * @symname: symlink data 9202bad8471SEric Van Hensbergen * 9212bad8471SEric Van Hensbergen * See 9P2000.u RFC for more information 9222bad8471SEric Van Hensbergen * 9232bad8471SEric Van Hensbergen */ 9242bad8471SEric Van Hensbergen 9252bad8471SEric Van Hensbergen static int 9262bad8471SEric Van Hensbergen v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 9272bad8471SEric Van Hensbergen { 9282bad8471SEric Van Hensbergen int retval = -EPERM; 9292bad8471SEric Van Hensbergen struct v9fs_fid *newfid; 9302bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 9312bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 9322bad8471SEric Van Hensbergen struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); 9332bad8471SEric Van Hensbergen 9342bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 9352bad8471SEric Van Hensbergen symname); 9362bad8471SEric Van Hensbergen 93773c592b9SEric Van Hensbergen if (!mistat) 93873c592b9SEric Van Hensbergen return -ENOMEM; 9392bad8471SEric Van Hensbergen 9402bad8471SEric Van Hensbergen if (!v9ses->extended) { 9412bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "not extended\n"); 9422bad8471SEric Van Hensbergen goto FreeFcall; 9432bad8471SEric Van Hensbergen } 9442bad8471SEric Van Hensbergen 9452bad8471SEric Van Hensbergen /* issue a create */ 9462bad8471SEric Van Hensbergen retval = v9fs_create(dir, dentry, S_IFLNK, 0); 9472bad8471SEric Van Hensbergen if (retval != 0) 9482bad8471SEric Van Hensbergen goto FreeFcall; 9492bad8471SEric Van Hensbergen 9502bad8471SEric Van Hensbergen newfid = v9fs_fid_lookup(dentry, FID_OP); 9512bad8471SEric Van Hensbergen 9522bad8471SEric Van Hensbergen /* issue a twstat */ 9532bad8471SEric Van Hensbergen v9fs_blank_mistat(v9ses, mistat); 9542bad8471SEric Van Hensbergen strcpy(mistat->data + 1, symname); 9552bad8471SEric Van Hensbergen mistat->extension = mistat->data + 1; 9562bad8471SEric Van Hensbergen retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); 9572bad8471SEric Van Hensbergen if (retval < 0) { 9582bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", 9592bad8471SEric Van Hensbergen FCALL_ERROR(fcall)); 9602bad8471SEric Van Hensbergen goto FreeFcall; 9612bad8471SEric Van Hensbergen } 9622bad8471SEric Van Hensbergen 9632bad8471SEric Van Hensbergen kfree(fcall); 9642bad8471SEric Van Hensbergen 9652bad8471SEric Van Hensbergen if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { 9662bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", 9672bad8471SEric Van Hensbergen FCALL_ERROR(fcall)); 9682bad8471SEric Van Hensbergen goto FreeFcall; 9692bad8471SEric Van Hensbergen } 9702bad8471SEric Van Hensbergen 9712bad8471SEric Van Hensbergen d_drop(dentry); /* FID - will this also clunk? */ 9722bad8471SEric Van Hensbergen 9732bad8471SEric Van Hensbergen FreeFcall: 9742bad8471SEric Van Hensbergen kfree(mistat); 9752bad8471SEric Van Hensbergen kfree(fcall); 9762bad8471SEric Van Hensbergen 9772bad8471SEric Van Hensbergen return retval; 9782bad8471SEric Van Hensbergen } 9792bad8471SEric Van Hensbergen 9802bad8471SEric Van Hensbergen /** 9812bad8471SEric Van Hensbergen * v9fs_readlink - read a symlink's location (internal version) 9822bad8471SEric Van Hensbergen * @dentry: dentry for symlink 98373c592b9SEric Van Hensbergen * @buffer: buffer to load symlink location into 9842bad8471SEric Van Hensbergen * @buflen: length of buffer 9852bad8471SEric Van Hensbergen * 9862bad8471SEric Van Hensbergen */ 9872bad8471SEric Van Hensbergen 9882bad8471SEric Van Hensbergen static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 9892bad8471SEric Van Hensbergen { 9902bad8471SEric Van Hensbergen int retval = -EPERM; 9912bad8471SEric Van Hensbergen 9922bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 9932bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); 9942bad8471SEric Van Hensbergen struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP); 9952bad8471SEric Van Hensbergen 9962bad8471SEric Van Hensbergen if (!fid) { 9972bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n"); 9982bad8471SEric Van Hensbergen retval = -EBADF; 9992bad8471SEric Van Hensbergen goto FreeFcall; 10002bad8471SEric Van Hensbergen } 10012bad8471SEric Van Hensbergen 10022bad8471SEric Van Hensbergen if (!v9ses->extended) { 10032bad8471SEric Van Hensbergen retval = -EBADF; 10042bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "not extended\n"); 10052bad8471SEric Van Hensbergen goto FreeFcall; 10062bad8471SEric Van Hensbergen } 10072bad8471SEric Van Hensbergen 10082bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name); 10092bad8471SEric Van Hensbergen retval = v9fs_t_stat(v9ses, fid->fid, &fcall); 10102bad8471SEric Van Hensbergen 10112bad8471SEric Van Hensbergen if (retval < 0) { 10122bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "stat error\n"); 10132bad8471SEric Van Hensbergen goto FreeFcall; 10142bad8471SEric Van Hensbergen } 10152bad8471SEric Van Hensbergen 10162bad8471SEric Van Hensbergen if (!fcall) 10172bad8471SEric Van Hensbergen return -EIO; 10182bad8471SEric Van Hensbergen 10192bad8471SEric Van Hensbergen if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) { 10202bad8471SEric Van Hensbergen retval = -EINVAL; 10212bad8471SEric Van Hensbergen goto FreeFcall; 10222bad8471SEric Van Hensbergen } 10232bad8471SEric Van Hensbergen 10242bad8471SEric Van Hensbergen /* copy extension buffer into buffer */ 10252bad8471SEric Van Hensbergen if (strlen(fcall->params.rstat.stat->extension) < buflen) 10262bad8471SEric Van Hensbergen buflen = strlen(fcall->params.rstat.stat->extension); 10272bad8471SEric Van Hensbergen 10282bad8471SEric Van Hensbergen memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1); 10292bad8471SEric Van Hensbergen 10302bad8471SEric Van Hensbergen retval = buflen; 10312bad8471SEric Van Hensbergen 10322bad8471SEric Van Hensbergen FreeFcall: 10332bad8471SEric Van Hensbergen kfree(fcall); 10342bad8471SEric Van Hensbergen 10352bad8471SEric Van Hensbergen return retval; 10362bad8471SEric Van Hensbergen } 10372bad8471SEric Van Hensbergen 10382bad8471SEric Van Hensbergen /** 10392bad8471SEric Van Hensbergen * v9fs_vfs_readlink - read a symlink's location 10402bad8471SEric Van Hensbergen * @dentry: dentry for symlink 10412bad8471SEric Van Hensbergen * @buf: buffer to load symlink location into 10422bad8471SEric Van Hensbergen * @buflen: length of buffer 10432bad8471SEric Van Hensbergen * 10442bad8471SEric Van Hensbergen */ 10452bad8471SEric Van Hensbergen 10462bad8471SEric Van Hensbergen static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, 10472bad8471SEric Van Hensbergen int buflen) 10482bad8471SEric Van Hensbergen { 10492bad8471SEric Van Hensbergen int retval; 10502bad8471SEric Van Hensbergen int ret; 10512bad8471SEric Van Hensbergen char *link = __getname(); 10522bad8471SEric Van Hensbergen 10532bad8471SEric Van Hensbergen if (strlen(link) < buflen) 10542bad8471SEric Van Hensbergen buflen = strlen(link); 10552bad8471SEric Van Hensbergen 10562bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); 10572bad8471SEric Van Hensbergen 10582bad8471SEric Van Hensbergen retval = v9fs_readlink(dentry, link, buflen); 10592bad8471SEric Van Hensbergen 10602bad8471SEric Van Hensbergen if (retval > 0) { 10612bad8471SEric Van Hensbergen if ((ret = copy_to_user(buffer, link, retval)) != 0) { 10622bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "problem copying to user: %d\n", 10632bad8471SEric Van Hensbergen ret); 10642bad8471SEric Van Hensbergen retval = ret; 10652bad8471SEric Van Hensbergen } 10662bad8471SEric Van Hensbergen } 10672bad8471SEric Van Hensbergen 10682bad8471SEric Van Hensbergen putname(link); 10692bad8471SEric Van Hensbergen return retval; 10702bad8471SEric Van Hensbergen } 10712bad8471SEric Van Hensbergen 10722bad8471SEric Van Hensbergen /** 10732bad8471SEric Van Hensbergen * v9fs_vfs_follow_link - follow a symlink path 10742bad8471SEric Van Hensbergen * @dentry: dentry for symlink 10752bad8471SEric Van Hensbergen * @nd: nameidata 10762bad8471SEric Van Hensbergen * 10772bad8471SEric Van Hensbergen */ 10782bad8471SEric Van Hensbergen 10792bad8471SEric Van Hensbergen static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 10802bad8471SEric Van Hensbergen { 10812bad8471SEric Van Hensbergen int len = 0; 10822bad8471SEric Van Hensbergen char *link = __getname(); 10832bad8471SEric Van Hensbergen 10842bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, "%s n", dentry->d_name.name); 10852bad8471SEric Van Hensbergen 10862bad8471SEric Van Hensbergen if (!link) 10872bad8471SEric Van Hensbergen link = ERR_PTR(-ENOMEM); 10882bad8471SEric Van Hensbergen else { 10892bad8471SEric Van Hensbergen len = v9fs_readlink(dentry, link, strlen(link)); 10902bad8471SEric Van Hensbergen 10912bad8471SEric Van Hensbergen if (len < 0) { 10922bad8471SEric Van Hensbergen putname(link); 10932bad8471SEric Van Hensbergen link = ERR_PTR(len); 10942bad8471SEric Van Hensbergen } else 10952bad8471SEric Van Hensbergen link[len] = 0; 10962bad8471SEric Van Hensbergen } 10972bad8471SEric Van Hensbergen nd_set_link(nd, link); 10982bad8471SEric Van Hensbergen 10992bad8471SEric Van Hensbergen return NULL; 11002bad8471SEric Van Hensbergen } 11012bad8471SEric Van Hensbergen 11022bad8471SEric Van Hensbergen /** 11032bad8471SEric Van Hensbergen * v9fs_vfs_put_link - release a symlink path 11042bad8471SEric Van Hensbergen * @dentry: dentry for symlink 11052bad8471SEric Van Hensbergen * @nd: nameidata 11062bad8471SEric Van Hensbergen * 11072bad8471SEric Van Hensbergen */ 11082bad8471SEric Van Hensbergen 11092bad8471SEric Van Hensbergen static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 11102bad8471SEric Van Hensbergen { 11112bad8471SEric Van Hensbergen char *s = nd_get_link(nd); 11122bad8471SEric Van Hensbergen 11132bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); 11142bad8471SEric Van Hensbergen if (!IS_ERR(s)) 11152bad8471SEric Van Hensbergen putname(s); 11162bad8471SEric Van Hensbergen } 11172bad8471SEric Van Hensbergen 11182bad8471SEric Van Hensbergen /** 11192bad8471SEric Van Hensbergen * v9fs_vfs_link - create a hardlink 11202bad8471SEric Van Hensbergen * @old_dentry: dentry for file to link to 11212bad8471SEric Van Hensbergen * @dir: inode destination for new link 112273c592b9SEric Van Hensbergen * @dentry: dentry for link 11232bad8471SEric Van Hensbergen * 11242bad8471SEric Van Hensbergen */ 11252bad8471SEric Van Hensbergen 11262bad8471SEric Van Hensbergen /* XXX - lots of code dup'd from symlink and creates, 11272bad8471SEric Van Hensbergen * figure out a better reuse strategy 11282bad8471SEric Van Hensbergen */ 11292bad8471SEric Van Hensbergen 11302bad8471SEric Van Hensbergen static int 11312bad8471SEric Van Hensbergen v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 11322bad8471SEric Van Hensbergen struct dentry *dentry) 11332bad8471SEric Van Hensbergen { 11342bad8471SEric Van Hensbergen int retval = -EPERM; 11352bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 11362bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 11372bad8471SEric Van Hensbergen struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); 11382bad8471SEric Van Hensbergen struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_OP); 11392bad8471SEric Van Hensbergen struct v9fs_fid *newfid = NULL; 11402bad8471SEric Van Hensbergen char *symname = __getname(); 11412bad8471SEric Van Hensbergen 11422bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 11432bad8471SEric Van Hensbergen old_dentry->d_name.name); 11442bad8471SEric Van Hensbergen 11452bad8471SEric Van Hensbergen if (!v9ses->extended) { 11462bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "not extended\n"); 11472bad8471SEric Van Hensbergen goto FreeMem; 11482bad8471SEric Van Hensbergen } 11492bad8471SEric Van Hensbergen 11502bad8471SEric Van Hensbergen /* get fid of old_dentry */ 11512bad8471SEric Van Hensbergen sprintf(symname, "hardlink(%d)\n", oldfid->fid); 11522bad8471SEric Van Hensbergen 11532bad8471SEric Van Hensbergen /* issue a create */ 11542bad8471SEric Van Hensbergen retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0); 11552bad8471SEric Van Hensbergen if (retval != 0) 11562bad8471SEric Van Hensbergen goto FreeMem; 11572bad8471SEric Van Hensbergen 11582bad8471SEric Van Hensbergen newfid = v9fs_fid_lookup(dentry, FID_OP); 11592bad8471SEric Van Hensbergen if (!newfid) { 11602bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n"); 11612bad8471SEric Van Hensbergen goto FreeMem; 11622bad8471SEric Van Hensbergen } 11632bad8471SEric Van Hensbergen 11642bad8471SEric Van Hensbergen /* issue a twstat */ 11652bad8471SEric Van Hensbergen v9fs_blank_mistat(v9ses, mistat); 11662bad8471SEric Van Hensbergen strcpy(mistat->data + 1, symname); 11672bad8471SEric Van Hensbergen mistat->extension = mistat->data + 1; 11682bad8471SEric Van Hensbergen retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); 11692bad8471SEric Van Hensbergen if (retval < 0) { 11702bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", 11712bad8471SEric Van Hensbergen FCALL_ERROR(fcall)); 11722bad8471SEric Van Hensbergen goto FreeMem; 11732bad8471SEric Van Hensbergen } 11742bad8471SEric Van Hensbergen 11752bad8471SEric Van Hensbergen kfree(fcall); 11762bad8471SEric Van Hensbergen 11772bad8471SEric Van Hensbergen if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { 11782bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", 11792bad8471SEric Van Hensbergen FCALL_ERROR(fcall)); 11802bad8471SEric Van Hensbergen goto FreeMem; 11812bad8471SEric Van Hensbergen } 11822bad8471SEric Van Hensbergen 11832bad8471SEric Van Hensbergen d_drop(dentry); /* FID - will this also clunk? */ 11842bad8471SEric Van Hensbergen 11852bad8471SEric Van Hensbergen kfree(fcall); 11862bad8471SEric Van Hensbergen fcall = NULL; 11872bad8471SEric Van Hensbergen 11882bad8471SEric Van Hensbergen FreeMem: 11892bad8471SEric Van Hensbergen kfree(mistat); 11902bad8471SEric Van Hensbergen kfree(fcall); 11912bad8471SEric Van Hensbergen putname(symname); 11922bad8471SEric Van Hensbergen return retval; 11932bad8471SEric Van Hensbergen } 11942bad8471SEric Van Hensbergen 11952bad8471SEric Van Hensbergen /** 11962bad8471SEric Van Hensbergen * v9fs_vfs_mknod - create a special file 11972bad8471SEric Van Hensbergen * @dir: inode destination for new link 11982bad8471SEric Van Hensbergen * @dentry: dentry for file 11992bad8471SEric Van Hensbergen * @mode: mode for creation 12002bad8471SEric Van Hensbergen * @dev_t: device associated with special file 12012bad8471SEric Van Hensbergen * 12022bad8471SEric Van Hensbergen */ 12032bad8471SEric Van Hensbergen 12042bad8471SEric Van Hensbergen static int 12052bad8471SEric Van Hensbergen v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 12062bad8471SEric Van Hensbergen { 12072bad8471SEric Van Hensbergen int retval = -EPERM; 12082bad8471SEric Van Hensbergen struct v9fs_fid *newfid; 12092bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 12102bad8471SEric Van Hensbergen struct v9fs_fcall *fcall = NULL; 12112bad8471SEric Van Hensbergen struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL); 12122bad8471SEric Van Hensbergen char *symname = __getname(); 12132bad8471SEric Van Hensbergen 12142bad8471SEric Van Hensbergen dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 12152bad8471SEric Van Hensbergen dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 12162bad8471SEric Van Hensbergen 121773c592b9SEric Van Hensbergen if (!mistat) 121873c592b9SEric Van Hensbergen return -ENOMEM; 121973c592b9SEric Van Hensbergen 12202bad8471SEric Van Hensbergen if (!new_valid_dev(rdev)) { 12212bad8471SEric Van Hensbergen retval = -EINVAL; 12222bad8471SEric Van Hensbergen goto FreeMem; 12232bad8471SEric Van Hensbergen } 12242bad8471SEric Van Hensbergen 12252bad8471SEric Van Hensbergen if (!v9ses->extended) { 12262bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "not extended\n"); 12272bad8471SEric Van Hensbergen goto FreeMem; 12282bad8471SEric Van Hensbergen } 12292bad8471SEric Van Hensbergen 12302bad8471SEric Van Hensbergen /* issue a create */ 12312bad8471SEric Van Hensbergen retval = v9fs_create(dir, dentry, mode, 0); 12322bad8471SEric Van Hensbergen 12332bad8471SEric Van Hensbergen if (retval != 0) 12342bad8471SEric Van Hensbergen goto FreeMem; 12352bad8471SEric Van Hensbergen 12362bad8471SEric Van Hensbergen newfid = v9fs_fid_lookup(dentry, FID_OP); 12372bad8471SEric Van Hensbergen if (!newfid) { 12382bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n"); 12392bad8471SEric Van Hensbergen retval = -EINVAL; 12402bad8471SEric Van Hensbergen goto FreeMem; 12412bad8471SEric Van Hensbergen } 12422bad8471SEric Van Hensbergen 12432bad8471SEric Van Hensbergen /* build extension */ 12442bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 12452bad8471SEric Van Hensbergen sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev)); 12462bad8471SEric Van Hensbergen else if (S_ISCHR(mode)) 12472bad8471SEric Van Hensbergen sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev)); 124873c592b9SEric Van Hensbergen else if (S_ISFIFO(mode)) 124973c592b9SEric Van Hensbergen ; /* DO NOTHING */ 12502bad8471SEric Van Hensbergen else { 12512bad8471SEric Van Hensbergen retval = -EINVAL; 12522bad8471SEric Van Hensbergen goto FreeMem; 12532bad8471SEric Van Hensbergen } 12542bad8471SEric Van Hensbergen 12552bad8471SEric Van Hensbergen if (!S_ISFIFO(mode)) { 12562bad8471SEric Van Hensbergen /* issue a twstat */ 12572bad8471SEric Van Hensbergen v9fs_blank_mistat(v9ses, mistat); 12582bad8471SEric Van Hensbergen strcpy(mistat->data + 1, symname); 12592bad8471SEric Van Hensbergen mistat->extension = mistat->data + 1; 12602bad8471SEric Van Hensbergen retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall); 12612bad8471SEric Van Hensbergen if (retval < 0) { 12622bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n", 12632bad8471SEric Van Hensbergen FCALL_ERROR(fcall)); 12642bad8471SEric Van Hensbergen goto FreeMem; 12652bad8471SEric Van Hensbergen } 12662bad8471SEric Van Hensbergen } 12672bad8471SEric Van Hensbergen 12682bad8471SEric Van Hensbergen /* need to update dcache so we show up */ 12692bad8471SEric Van Hensbergen kfree(fcall); 12702bad8471SEric Van Hensbergen 12712bad8471SEric Van Hensbergen if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) { 12722bad8471SEric Van Hensbergen dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n", 12732bad8471SEric Van Hensbergen FCALL_ERROR(fcall)); 12742bad8471SEric Van Hensbergen goto FreeMem; 12752bad8471SEric Van Hensbergen } 12762bad8471SEric Van Hensbergen 12772bad8471SEric Van Hensbergen d_drop(dentry); /* FID - will this also clunk? */ 12782bad8471SEric Van Hensbergen 12792bad8471SEric Van Hensbergen FreeMem: 12802bad8471SEric Van Hensbergen kfree(mistat); 12812bad8471SEric Van Hensbergen kfree(fcall); 12822bad8471SEric Van Hensbergen putname(symname); 12832bad8471SEric Van Hensbergen 12842bad8471SEric Van Hensbergen return retval; 12852bad8471SEric Van Hensbergen } 12862bad8471SEric Van Hensbergen 12872bad8471SEric Van Hensbergen static struct inode_operations v9fs_dir_inode_operations = { 12882bad8471SEric Van Hensbergen .create = v9fs_vfs_create, 12892bad8471SEric Van Hensbergen .lookup = v9fs_vfs_lookup, 12902bad8471SEric Van Hensbergen .symlink = v9fs_vfs_symlink, 12912bad8471SEric Van Hensbergen .link = v9fs_vfs_link, 12922bad8471SEric Van Hensbergen .unlink = v9fs_vfs_unlink, 12932bad8471SEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 12942bad8471SEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 12952bad8471SEric Van Hensbergen .mknod = v9fs_vfs_mknod, 12962bad8471SEric Van Hensbergen .rename = v9fs_vfs_rename, 12972bad8471SEric Van Hensbergen .readlink = v9fs_vfs_readlink, 12982bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 12992bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 13002bad8471SEric Van Hensbergen }; 13012bad8471SEric Van Hensbergen 13022bad8471SEric Van Hensbergen static struct inode_operations v9fs_file_inode_operations = { 13032bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 13042bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 13052bad8471SEric Van Hensbergen }; 13062bad8471SEric Van Hensbergen 13072bad8471SEric Van Hensbergen static struct inode_operations v9fs_symlink_inode_operations = { 13082bad8471SEric Van Hensbergen .readlink = v9fs_vfs_readlink, 13092bad8471SEric Van Hensbergen .follow_link = v9fs_vfs_follow_link, 13102bad8471SEric Van Hensbergen .put_link = v9fs_vfs_put_link, 13112bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 13122bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 13132bad8471SEric Van Hensbergen }; 1314