| /* |
| * linux/fs/9p/vfs_inode.c |
| * |
| * This file contains vfs inode ops for the 9P2000 protocol. |
| * |
| * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
| * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to: |
| * Free Software Foundation |
| * 51 Franklin Street, Fifth Floor |
| * Boston, MA 02111-1301 USA |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/errno.h> |
| #include <linux/fs.h> |
| #include <linux/file.h> |
| #include <linux/pagemap.h> |
| #include <linux/stat.h> |
| #include <linux/string.h> |
| #include <linux/inet.h> |
| #include <linux/namei.h> |
| #include <linux/idr.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/xattr.h> |
| #include <net/9p/9p.h> |
| #include <net/9p/client.h> |
| |
| #include "v9fs.h" |
| #include "v9fs_vfs.h" |
| #include "fid.h" |
| #include "cache.h" |
| #include "xattr.h" |
| |
| static const struct inode_operations v9fs_dir_inode_operations; |
| static const struct inode_operations v9fs_dir_inode_operations_dotu; |
| static const struct inode_operations v9fs_dir_inode_operations_dotl; |
| static const struct inode_operations v9fs_file_inode_operations; |
| static const struct inode_operations v9fs_file_inode_operations_dotl; |
| static const struct inode_operations v9fs_symlink_inode_operations; |
| static const struct inode_operations v9fs_symlink_inode_operations_dotl; |
| |
| /** |
| * unixmode2p9mode - convert unix mode bits to plan 9 |
| * @v9ses: v9fs session information |
| * @mode: mode to convert |
| * |
| */ |
| |
| static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) |
| { |
| int res; |
| res = mode & 0777; |
| if (S_ISDIR(mode)) |
| res |= P9_DMDIR; |
| if (v9fs_proto_dotu(v9ses)) { |
| if (S_ISLNK(mode)) |
| res |= P9_DMSYMLINK; |
| if (v9ses->nodev == 0) { |
| if (S_ISSOCK(mode)) |
| res |= P9_DMSOCKET; |
| if (S_ISFIFO(mode)) |
| res |= P9_DMNAMEDPIPE; |
| if (S_ISBLK(mode)) |
| res |= P9_DMDEVICE; |
| if (S_ISCHR(mode)) |
| res |= P9_DMDEVICE; |
| } |
| |
| if ((mode & S_ISUID) == S_ISUID) |
| res |= P9_DMSETUID; |
| if ((mode & S_ISGID) == S_ISGID) |
| res |= P9_DMSETGID; |
| if ((mode & S_ISVTX) == S_ISVTX) |
| res |= P9_DMSETVTX; |
| if ((mode & P9_DMLINK)) |
| res |= P9_DMLINK; |
| } |
| |
| return res; |
| } |
| |
| /** |
| * p9mode2unixmode- convert plan9 mode bits to unix mode bits |
| * @v9ses: v9fs session information |
| * @mode: mode to convert |
| * |
| */ |
| |
| static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) |
| { |
| int res; |
| |
| res = mode & 0777; |
| |
| if ((mode & P9_DMDIR) == P9_DMDIR) |
| res |= S_IFDIR; |
| else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) |
| res |= S_IFLNK; |
| else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) |
| && (v9ses->nodev == 0)) |
| res |= S_IFSOCK; |
| else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) |
| && (v9ses->nodev == 0)) |
| res |= S_IFIFO; |
| else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) |
| && (v9ses->nodev == 0)) |
| res |= S_IFBLK; |
| else |
| res |= S_IFREG; |
| |
| if (v9fs_proto_dotu(v9ses)) { |
| if ((mode & P9_DMSETUID) == P9_DMSETUID) |
| res |= S_ISUID; |
| |
| if ((mode & P9_DMSETGID) == P9_DMSETGID) |
| res |= S_ISGID; |
| |
| if ((mode & P9_DMSETVTX) == P9_DMSETVTX) |
| res |= S_ISVTX; |
| } |
| |
| return res; |
| } |
| |
| /** |
| * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits |
| * @uflags: flags to convert |
| * @extended: if .u extensions are active |
| */ |
| |
| int v9fs_uflags2omode(int uflags, int extended) |
| { |
| int ret; |
| |
| ret = 0; |
| switch (uflags&3) { |
| default: |
| case O_RDONLY: |
| ret = P9_OREAD; |
| break; |
| |
| case O_WRONLY: |
| ret = P9_OWRITE; |
| break; |
| |
| case O_RDWR: |
| ret = P9_ORDWR; |
| break; |
| } |
| |
| if (uflags & O_TRUNC) |
| ret |= P9_OTRUNC; |
| |
| if (extended) { |
| if (uflags & O_EXCL) |
| ret |= P9_OEXCL; |
| |
| if (uflags & O_APPEND) |
| ret |= P9_OAPPEND; |
| } |
| |
| return ret; |
| } |
| |
| /** |
| * v9fs_blank_wstat - helper function to setup a 9P stat structure |
| * @wstat: structure to initialize |
| * |
| */ |
| |
| void |
| v9fs_blank_wstat(struct p9_wstat *wstat) |
| { |
| wstat->type = ~0; |
| wstat->dev = ~0; |
| wstat->qid.type = ~0; |
| wstat->qid.version = ~0; |
| *((long long *)&wstat->qid.path) = ~0; |
| wstat->mode = ~0; |
| wstat->atime = ~0; |
| wstat->mtime = ~0; |
| wstat->length = ~0; |
| wstat->name = NULL; |
| wstat->uid = NULL; |
| wstat->gid = NULL; |
| wstat->muid = NULL; |
| wstat->n_uid = ~0; |
| wstat->n_gid = ~0; |
| wstat->n_muid = ~0; |
| wstat->extension = NULL; |
| } |
| |
| #ifdef CONFIG_9P_FSCACHE |
| /** |
| * v9fs_alloc_inode - helper function to allocate an inode |
| * This callback is executed before setting up the inode so that we |
| * can associate a vcookie with each inode. |
| * |
| */ |
| |
| struct inode *v9fs_alloc_inode(struct super_block *sb) |
| { |
| struct v9fs_cookie *vcookie; |
| vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache, |
| GFP_KERNEL); |
| if (!vcookie) |
| return NULL; |
| |
| vcookie->fscache = NULL; |
| vcookie->qid = NULL; |
| spin_lock_init(&vcookie->lock); |
| return &vcookie->inode; |
| } |
| |
| /** |
| * v9fs_destroy_inode - destroy an inode |
| * |
| */ |
| |
| void v9fs_destroy_inode(struct inode *inode) |
| { |
| kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode)); |
| } |
| #endif |
| |
| /** |
| * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a |
| * new file system object. This checks the S_ISGID to determine the owning |
| * group of the new file system object. |
| */ |
| |
| static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode) |
| { |
| BUG_ON(dir_inode == NULL); |
| |
| if (dir_inode->i_mode & S_ISGID) { |
| /* set_gid bit is set.*/ |
| return dir_inode->i_gid; |
| } |
| return current_fsgid(); |
| } |
| |
| /** |
| * v9fs_dentry_from_dir_inode - helper function to get the dentry from |
| * dir inode. |
| * |
| */ |
| |
| struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode) |
| { |
| struct dentry *dentry; |
| |
| spin_lock(&dcache_lock); |
| /* Directory should have only one entry. */ |
| BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry)); |
| dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias); |
| spin_unlock(&dcache_lock); |
| return dentry; |
| } |
| |
| /** |
| * v9fs_get_inode - helper function to setup an inode |
| * @sb: superblock |
| * @mode: mode to setup inode with |
| * |
| */ |
| |
| struct inode *v9fs_get_inode(struct super_block *sb, int mode) |
| { |
| int err; |
| struct inode *inode; |
| struct v9fs_session_info *v9ses = sb->s_fs_info; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); |
| |
| inode = new_inode(sb); |
| if (!inode) { |
| P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| inode_init_owner(inode, NULL, mode); |
| inode->i_blocks = 0; |
| inode->i_rdev = 0; |
| inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| inode->i_mapping->a_ops = &v9fs_addr_operations; |
| |
| switch (mode & S_IFMT) { |
| case S_IFIFO: |
| case S_IFBLK: |
| case S_IFCHR: |
| case S_IFSOCK: |
| if (v9fs_proto_dotl(v9ses)) { |
| inode->i_op = &v9fs_file_inode_operations_dotl; |
| inode->i_fop = &v9fs_file_operations_dotl; |
| } else if (v9fs_proto_dotu(v9ses)) { |
| inode->i_op = &v9fs_file_inode_operations; |
| inode->i_fop = &v9fs_file_operations; |
| } else { |
| P9_DPRINTK(P9_DEBUG_ERROR, |
| "special files without extended mode\n"); |
| err = -EINVAL; |
| goto error; |
| } |
| init_special_inode(inode, inode->i_mode, inode->i_rdev); |
| break; |
| case S_IFREG: |
| if (v9fs_proto_dotl(v9ses)) { |
| inode->i_op = &v9fs_file_inode_operations_dotl; |
| inode->i_fop = &v9fs_file_operations_dotl; |
| } else { |
| inode->i_op = &v9fs_file_inode_operations; |
| inode->i_fop = &v9fs_file_operations; |
| } |
| |
| break; |
| |
| case S_IFLNK: |
| if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { |
| P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " |
| "legacy protocol.\n"); |
| err = -EINVAL; |
| goto error; |
| } |
| |
| if (v9fs_proto_dotl(v9ses)) |
| inode->i_op = &v9fs_symlink_inode_operations_dotl; |
| else |
| inode->i_op = &v9fs_symlink_inode_operations; |
| |
| break; |
| case S_IFDIR: |
| inc_nlink(inode); |
| if (v9fs_proto_dotl(v9ses)) |
| inode->i_op = &v9fs_dir_inode_operations_dotl; |
| else if (v9fs_proto_dotu(v9ses)) |
| inode->i_op = &v9fs_dir_inode_operations_dotu; |
| else |
| inode->i_op = &v9fs_dir_inode_operations; |
| |
| if (v9fs_proto_dotl(v9ses)) |
| inode->i_fop = &v9fs_dir_operations_dotl; |
| else |
| inode->i_fop = &v9fs_dir_operations; |
| |
| break; |
| default: |
| P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", |
| mode, mode & S_IFMT); |
| err = -EINVAL; |
| goto error; |
| } |
| |
| return inode; |
| |
| error: |
| iput(inode); |
| return ERR_PTR(err); |
| } |
| |
| /* |
| static struct v9fs_fid* |
| v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) |
| { |
| int err; |
| int nfid; |
| struct v9fs_fid *ret; |
| struct v9fs_fcall *fcall; |
| |
| nfid = v9fs_get_idpool(&v9ses->fidpool); |
| if (nfid < 0) { |
| eprintk(KERN_WARNING, "no free fids available\n"); |
| return ERR_PTR(-ENOSPC); |
| } |
| |
| err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
| &fcall); |
| |
| if (err < 0) { |
| if (fcall && fcall->id == RWALK) |
| goto clunk_fid; |
| |
| PRINT_FCALL_ERROR("walk error", fcall); |
| v9fs_put_idpool(nfid, &v9ses->fidpool); |
| goto error; |
| } |
| |
| kfree(fcall); |
| fcall = NULL; |
| ret = v9fs_fid_create(v9ses, nfid); |
| if (!ret) { |
| err = -ENOMEM; |
| goto clunk_fid; |
| } |
| |
| err = v9fs_fid_insert(ret, dentry); |
| if (err < 0) { |
| v9fs_fid_destroy(ret); |
| goto clunk_fid; |
| } |
| |
| return ret; |
| |
| clunk_fid: |
| v9fs_t_clunk(v9ses, nfid); |
| |
| error: |
| kfree(fcall); |
| return ERR_PTR(err); |
| } |
| */ |
| |
| |
| /** |
| * v9fs_clear_inode - release an inode |
| * @inode: inode to release |
| * |
| */ |
| void v9fs_clear_inode(struct inode *inode) |
| { |
| filemap_fdatawrite(inode->i_mapping); |
| |
| #ifdef CONFIG_9P_FSCACHE |
| v9fs_cache_inode_put_cookie(inode); |
| #endif |
| } |
| |
| static struct inode * |
| v9fs_inode(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
| struct super_block *sb) |
| { |
| int err, umode; |
| struct inode *ret = NULL; |
| struct p9_wstat *st; |
| |
| st = p9_client_stat(fid); |
| if (IS_ERR(st)) |
| return ERR_CAST(st); |
| |
| umode = p9mode2unixmode(v9ses, st->mode); |
| ret = v9fs_get_inode(sb, umode); |
| if (IS_ERR(ret)) { |
| err = PTR_ERR(ret); |
| goto error; |
| } |
| |
| v9fs_stat2inode(st, ret, sb); |
| ret->i_ino = v9fs_qid2ino(&st->qid); |
| |
| #ifdef CONFIG_9P_FSCACHE |
| v9fs_vcookie_set_qid(ret, &st->qid); |
| v9fs_cache_inode_get_cookie(ret); |
| #endif |
| p9stat_free(st); |
| kfree(st); |
| return ret; |
| error: |
| p9stat_free(st); |
| kfree(st); |
| return ERR_PTR(err); |
| } |
| |
| static struct inode * |
| v9fs_inode_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
| struct super_block *sb) |
| { |
| struct inode *ret = NULL; |
| int err; |
| struct p9_stat_dotl *st; |
| |
| st = p9_client_getattr_dotl(fid, P9_STATS_BASIC); |
| if (IS_ERR(st)) |
| return ERR_CAST(st); |
| |
| ret = v9fs_get_inode(sb, st->st_mode); |
| if (IS_ERR(ret)) { |
| err = PTR_ERR(ret); |
| goto error; |
| } |
| |
| v9fs_stat2inode_dotl(st, ret); |
| ret->i_ino = v9fs_qid2ino(&st->qid); |
| #ifdef CONFIG_9P_FSCACHE |
| v9fs_vcookie_set_qid(ret, &st->qid); |
| v9fs_cache_inode_get_cookie(ret); |
| #endif |
| kfree(st); |
| return ret; |
| error: |
| kfree(st); |
| return ERR_PTR(err); |
| } |
| |
| /** |
| * v9fs_inode_from_fid - Helper routine to populate an inode by |
| * issuing a attribute request |
| * @v9ses: session information |
| * @fid: fid to issue attribute request for |
| * @sb: superblock on which to create inode |
| * |
| */ |
| static inline struct inode * |
| v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
| struct super_block *sb) |
| { |
| if (v9fs_proto_dotl(v9ses)) |
| return v9fs_inode_dotl(v9ses, fid, sb); |
| else |
| return v9fs_inode(v9ses, fid, sb); |
| } |
| |
| /** |
| * v9fs_remove - helper function to remove files and directories |
| * @dir: directory inode that is being deleted |
| * @file: dentry that is being deleted |
| * @rmdir: removing a directory |
| * |
| */ |
| |
| static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) |
| { |
| int retval; |
| struct inode *file_inode; |
| struct p9_fid *v9fid; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, |
| rmdir); |
| |
| file_inode = file->d_inode; |
| v9fid = v9fs_fid_clone(file); |
| if (IS_ERR(v9fid)) |
| return PTR_ERR(v9fid); |
| |
| retval = p9_client_remove(v9fid); |
| if (!retval) |
| drop_nlink(file_inode); |
| return retval; |
| } |
| |
| static int |
| v9fs_open_created(struct inode *inode, struct file *file) |
| { |
| return 0; |
| } |
| |
| |
| /** |
| * v9fs_create - Create a file |
| * @v9ses: session information |
| * @dir: directory that dentry is being created in |
| * @dentry: dentry that is being created |
| * @extension: 9p2000.u extension string to support devices, etc. |
| * @perm: create permissions |
| * @mode: open mode |
| * |
| */ |
| static struct p9_fid * |
| v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, |
| struct dentry *dentry, char *extension, u32 perm, u8 mode) |
| { |
| int err; |
| char *name; |
| struct p9_fid *dfid, *ofid, *fid; |
| struct inode *inode; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
| |
| err = 0; |
| ofid = NULL; |
| fid = NULL; |
| name = (char *) dentry->d_name.name; |
| dfid = v9fs_fid_lookup(dentry->d_parent); |
| if (IS_ERR(dfid)) { |
| err = PTR_ERR(dfid); |
| P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| return ERR_PTR(err); |
| } |
| |
| /* clone a fid to use for creation */ |
| ofid = p9_client_walk(dfid, 0, NULL, 1); |
| if (IS_ERR(ofid)) { |
| err = PTR_ERR(ofid); |
| P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
| return ERR_PTR(err); |
| } |
| |
| err = p9_client_fcreate(ofid, name, perm, mode, extension); |
| if (err < 0) { |
| P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); |
| goto error; |
| } |
| |
| /* now walk from the parent so we can get unopened fid */ |
| fid = p9_client_walk(dfid, 1, &name, 1); |
| if (IS_ERR(fid)) { |
| err = PTR_ERR(fid); |
| P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
| fid = NULL; |
| goto error; |
| } |
| |
| /* instantiate inode and assign the unopened fid to the dentry */ |
| inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
| if (IS_ERR(inode)) { |
| err = PTR_ERR(inode); |
| P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
| goto error; |
| } |
| |
| if (v9ses->cache) |
| dentry->d_op = &v9fs_cached_dentry_operations; |
| else |
| dentry->d_op = &v9fs_dentry_operations; |
| |
| d_instantiate(dentry, inode); |
| err = v9fs_fid_add(dentry, fid); |
| if (err < 0) |
| goto error; |
| |
| return ofid; |
| |
| error: |
| if (ofid) |
| p9_client_clunk(ofid); |
| |
| if (fid) |
| p9_client_clunk(fid); |
| |
| return ERR_PTR(err); |
| } |
| |
| /** |
| * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. |
| * @dir: directory inode that is being created |
| * @dentry: dentry that is being deleted |
| * @mode: create permissions |
| * @nd: path information |
| * |
| */ |
| |
| static int |
| v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int mode, |
| struct nameidata *nd) |
| { |
| int err = 0; |
| char *name = NULL; |
| gid_t gid; |
| int flags; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid = NULL; |
| struct p9_fid *dfid, *ofid; |
| struct file *filp; |
| struct p9_qid qid; |
| struct inode *inode; |
| |
| v9ses = v9fs_inode2v9ses(dir); |
| if (nd && nd->flags & LOOKUP_OPEN) |
| flags = nd->intent.open.flags - 1; |
| else |
| flags = O_RDWR; |
| |
| name = (char *) dentry->d_name.name; |
| P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x " |
| "mode:0x%x\n", name, flags, mode); |
| |
| dfid = v9fs_fid_lookup(dentry->d_parent); |
| if (IS_ERR(dfid)) { |
| err = PTR_ERR(dfid); |
| P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| return err; |
| } |
| |
| /* clone a fid to use for creation */ |
| ofid = p9_client_walk(dfid, 0, NULL, 1); |
| if (IS_ERR(ofid)) { |
| err = PTR_ERR(ofid); |
| P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
| return err; |
| } |
| |
| gid = v9fs_get_fsgid_for_create(dir); |
| err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid); |
| if (err < 0) { |
| P9_DPRINTK(P9_DEBUG_VFS, |
| "p9_client_open_dotl failed in creat %d\n", |
| err); |
| goto error; |
| } |
| |
| /* No need to populate the inode if we are not opening the file AND |
| * not in cached mode. |
| */ |
| if (!v9ses->cache && !(nd && nd->flags & LOOKUP_OPEN)) { |
| /* Not in cached mode. No need to populate inode with stat */ |
| dentry->d_op = &v9fs_dentry_operations; |
| p9_client_clunk(ofid); |
| d_instantiate(dentry, NULL); |
| return 0; |
| } |
| |
| /* Now walk from the parent so we can get an unopened fid. */ |
| fid = p9_client_walk(dfid, 1, &name, 1); |
| if (IS_ERR(fid)) { |
| err = PTR_ERR(fid); |
| P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
| fid = NULL; |
| goto error; |
| } |
| |
| /* instantiate inode and assign the unopened fid to dentry */ |
| inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
| if (IS_ERR(inode)) { |
| err = PTR_ERR(inode); |
| P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
| goto error; |
| } |
| dentry->d_op = &v9fs_cached_dentry_operations; |
| d_instantiate(dentry, inode); |
| err = v9fs_fid_add(dentry, fid); |
| if (err < 0) |
| goto error; |
| |
| /* if we are opening a file, assign the open fid to the file */ |
| if (nd && nd->flags & LOOKUP_OPEN) { |
| filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); |
| if (IS_ERR(filp)) { |
| p9_client_clunk(ofid); |
| return PTR_ERR(filp); |
| } |
| filp->private_data = ofid; |
| } else |
| p9_client_clunk(ofid); |
| |
| return 0; |
| |
| error: |
| if (ofid) |
| p9_client_clunk(ofid); |
| if (fid) |
| p9_client_clunk(fid); |
| return err; |
| } |
| |
| /** |
| * v9fs_vfs_create - VFS hook to create files |
| * @dir: directory inode that is being created |
| * @dentry: dentry that is being deleted |
| * @mode: create permissions |
| * @nd: path information |
| * |
| */ |
| |
| static int |
| v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, |
| struct nameidata *nd) |
| { |
| int err; |
| u32 perm; |
| int flags; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid; |
| struct file *filp; |
| |
| err = 0; |
| fid = NULL; |
| v9ses = v9fs_inode2v9ses(dir); |
| perm = unixmode2p9mode(v9ses, mode); |
| if (nd && nd->flags & LOOKUP_OPEN) |
| flags = nd->intent.open.flags - 1; |
| else |
| flags = O_RDWR; |
| |
| fid = v9fs_create(v9ses, dir, dentry, NULL, perm, |
| v9fs_uflags2omode(flags, |
| v9fs_proto_dotu(v9ses))); |
| if (IS_ERR(fid)) { |
| err = PTR_ERR(fid); |
| fid = NULL; |
| goto error; |
| } |
| |
| /* if we are opening a file, assign the open fid to the file */ |
| if (nd && nd->flags & LOOKUP_OPEN) { |
| filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); |
| if (IS_ERR(filp)) { |
| err = PTR_ERR(filp); |
| goto error; |
| } |
| |
| filp->private_data = fid; |
| } else |
| p9_client_clunk(fid); |
| |
| return 0; |
| |
| error: |
| if (fid) |
| p9_client_clunk(fid); |
| |
| return err; |
| } |
| |
| /** |
| * v9fs_vfs_mkdir - VFS mkdir hook to create a directory |
| * @dir: inode that is being unlinked |
| * @dentry: dentry that is being unlinked |
| * @mode: mode for new directory |
| * |
| */ |
| |
| static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| { |
| int err; |
| u32 perm; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
| err = 0; |
| v9ses = v9fs_inode2v9ses(dir); |
| perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
| fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
| if (IS_ERR(fid)) { |
| err = PTR_ERR(fid); |
| fid = NULL; |
| } |
| |
| if (fid) |
| p9_client_clunk(fid); |
| |
| return err; |
| } |
| |
| |
| /** |
| * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory |
| * @dir: inode that is being unlinked |
| * @dentry: dentry that is being unlinked |
| * @mode: mode for new directory |
| * |
| */ |
| |
| static int v9fs_vfs_mkdir_dotl(struct inode *dir, struct dentry *dentry, |
| int mode) |
| { |
| int err; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid = NULL, *dfid = NULL; |
| gid_t gid; |
| char *name; |
| struct inode *inode; |
| struct p9_qid qid; |
| struct dentry *dir_dentry; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
| err = 0; |
| v9ses = v9fs_inode2v9ses(dir); |
| |
| mode |= S_IFDIR; |
| dir_dentry = v9fs_dentry_from_dir_inode(dir); |
| dfid = v9fs_fid_lookup(dir_dentry); |
| if (IS_ERR(dfid)) { |
| err = PTR_ERR(dfid); |
| P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| dfid = NULL; |
| goto error; |
| } |
| |
| gid = v9fs_get_fsgid_for_create(dir); |
| if (gid < 0) { |
| P9_DPRINTK(P9_DEBUG_VFS, "v9fs_get_fsgid_for_create failed\n"); |
| goto error; |
| } |
| |
| name = (char *) dentry->d_name.name; |
| err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); |
| if (err < 0) |
| goto error; |
| |
| /* instantiate inode and assign the unopened fid to the dentry */ |
| if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { |
| fid = p9_client_walk(dfid, 1, &name, 1); |
| if (IS_ERR(fid)) { |
| err = PTR_ERR(fid); |
| P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", |
| err); |
| fid = NULL; |
| goto error; |
| } |
| |
| inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
| if (IS_ERR(inode)) { |
| err = PTR_ERR(inode); |
| P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", |
| err); |
| goto error; |
| } |
| dentry->d_op = &v9fs_cached_dentry_operations; |
| d_instantiate(dentry, inode); |
| err = v9fs_fid_add(dentry, fid); |
| if (err < 0) |
| goto error; |
| fid = NULL; |
| } |
| error: |
| if (fid) |
| p9_client_clunk(fid); |
| return err; |
| } |
| |
| /** |
| * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode |
| * @dir: inode that is being walked from |
| * @dentry: dentry that is being walked to? |
| * @nameidata: path data |
| * |
| */ |
| |
| static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, |
| struct nameidata *nameidata) |
| { |
| struct super_block *sb; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *dfid, *fid; |
| struct inode *inode; |
| char *name; |
| int result = 0; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
| dir, dentry->d_name.name, dentry, nameidata); |
| |
| if (dentry->d_name.len > NAME_MAX) |
| return ERR_PTR(-ENAMETOOLONG); |
| |
| sb = dir->i_sb; |
| v9ses = v9fs_inode2v9ses(dir); |
| /* We can walk d_parent because we hold the dir->i_mutex */ |
| dfid = v9fs_fid_lookup(dentry->d_parent); |
| if (IS_ERR(dfid)) |
| return ERR_CAST(dfid); |
| |
| name = (char *) dentry->d_name.name; |
| fid = p9_client_walk(dfid, 1, &name, 1); |
| if (IS_ERR(fid)) { |
| result = PTR_ERR(fid); |
| if (result == -ENOENT) { |
| inode = NULL; |
| goto inst_out; |
| } |
| |
| return ERR_PTR(result); |
| } |
| |
| inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
| if (IS_ERR(inode)) { |
| result = PTR_ERR(inode); |
| inode = NULL; |
| goto error; |
| } |
| |
| result = v9fs_fid_add(dentry, fid); |
| if (result < 0) |
| goto error; |
| |
| inst_out: |
| if (v9ses->cache) |
| dentry->d_op = &v9fs_cached_dentry_operations; |
| else |
| dentry->d_op = &v9fs_dentry_operations; |
| |
| d_add(dentry, inode); |
| return NULL; |
| |
| error: |
| p9_client_clunk(fid); |
| |
| return ERR_PTR(result); |
| } |
| |
| /** |
| * v9fs_vfs_unlink - VFS unlink hook to delete an inode |
| * @i: inode that is being unlinked |
| * @d: dentry that is being unlinked |
| * |
| */ |
| |
| static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) |
| { |
| return v9fs_remove(i, d, 0); |
| } |
| |
| /** |
| * v9fs_vfs_rmdir - VFS unlink hook to delete a directory |
| * @i: inode that is being unlinked |
| * @d: dentry that is being unlinked |
| * |
| */ |
| |
| static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) |
| { |
| return v9fs_remove(i, d, 1); |
| } |
| |
| /** |
| * v9fs_vfs_rename - VFS hook to rename an inode |
| * @old_dir: old dir inode |
| * @old_dentry: old dentry |
| * @new_dir: new dir inode |
| * @new_dentry: new dentry |
| * |
| */ |
| |
| static int |
| v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| struct inode *new_dir, struct dentry *new_dentry) |
| { |
| struct inode *old_inode; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *oldfid; |
| struct p9_fid *olddirfid; |
| struct p9_fid *newdirfid; |
| struct p9_wstat wstat; |
| int retval; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
| retval = 0; |
| old_inode = old_dentry->d_inode; |
| v9ses = v9fs_inode2v9ses(old_inode); |
| oldfid = v9fs_fid_lookup(old_dentry); |
| if (IS_ERR(oldfid)) |
| return PTR_ERR(oldfid); |
| |
| olddirfid = v9fs_fid_clone(old_dentry->d_parent); |
| if (IS_ERR(olddirfid)) { |
| retval = PTR_ERR(olddirfid); |
| goto done; |
| } |
| |
| newdirfid = v9fs_fid_clone(new_dentry->d_parent); |
| if (IS_ERR(newdirfid)) { |
| retval = PTR_ERR(newdirfid); |
| goto clunk_olddir; |
| } |
| |
| down_write(&v9ses->rename_sem); |
| if (v9fs_proto_dotl(v9ses)) { |
| retval = p9_client_rename(oldfid, newdirfid, |
| (char *) new_dentry->d_name.name); |
| if (retval != -ENOSYS) |
| goto clunk_newdir; |
| } |
| if (old_dentry->d_parent != new_dentry->d_parent) { |
| /* |
| * 9P .u can only handle file rename in the same directory |
| */ |
| |
| P9_DPRINTK(P9_DEBUG_ERROR, |
| "old dir and new dir are different\n"); |
| retval = -EXDEV; |
| goto clunk_newdir; |
| } |
| v9fs_blank_wstat(&wstat); |
| wstat.muid = v9ses->uname; |
| wstat.name = (char *) new_dentry->d_name.name; |
| retval = p9_client_wstat(oldfid, &wstat); |
| |
| clunk_newdir: |
| if (!retval) |
| /* successful rename */ |
| d_move(old_dentry, new_dentry); |
| up_write(&v9ses->rename_sem); |
| p9_client_clunk(newdirfid); |
| |
| clunk_olddir: |
| p9_client_clunk(olddirfid); |
| |
| done: |
| return retval; |
| } |
| |
| /** |
| * v9fs_vfs_getattr - retrieve file metadata |
| * @mnt: mount information |
| * @dentry: file to get attributes on |
| * @stat: metadata structure to populate |
| * |
| */ |
| |
| static int |
| v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| struct kstat *stat) |
| { |
| int err; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid; |
| struct p9_wstat *st; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); |
| err = -EPERM; |
| v9ses = v9fs_inode2v9ses(dentry->d_inode); |
| if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
| return simple_getattr(mnt, dentry, stat); |
| |
| fid = v9fs_fid_lookup(dentry); |
| if (IS_ERR(fid)) |
| return PTR_ERR(fid); |
| |
| st = p9_client_stat(fid); |
| if (IS_ERR(st)) |
| return PTR_ERR(st); |
| |
| v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
| generic_fillattr(dentry->d_inode, stat); |
| |
| kfree(st); |
| return 0; |
| } |
| |
| static int |
| v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry, |
| struct kstat *stat) |
| { |
| int err; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid; |
| struct p9_stat_dotl *st; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); |
| err = -EPERM; |
| v9ses = v9fs_inode2v9ses(dentry->d_inode); |
| if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
| return simple_getattr(mnt, dentry, stat); |
| |
| fid = v9fs_fid_lookup(dentry); |
| if (IS_ERR(fid)) |
| return PTR_ERR(fid); |
| |
| /* Ask for all the fields in stat structure. Server will return |
| * whatever it supports |
| */ |
| |
| st = p9_client_getattr_dotl(fid, P9_STATS_ALL); |
| if (IS_ERR(st)) |
| return PTR_ERR(st); |
| |
| v9fs_stat2inode_dotl(st, dentry->d_inode); |
| generic_fillattr(dentry->d_inode, stat); |
| /* Change block size to what the server returned */ |
| stat->blksize = st->st_blksize; |
| |
| kfree(st); |
| return 0; |
| } |
| |
| /** |
| * v9fs_vfs_setattr - set file metadata |
| * @dentry: file whose metadata to set |
| * @iattr: metadata assignment structure |
| * |
| */ |
| |
| static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) |
| { |
| int retval; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid; |
| struct p9_wstat wstat; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
| retval = -EPERM; |
| v9ses = v9fs_inode2v9ses(dentry->d_inode); |
| fid = v9fs_fid_lookup(dentry); |
| if(IS_ERR(fid)) |
| return PTR_ERR(fid); |
| |
| v9fs_blank_wstat(&wstat); |
| if (iattr->ia_valid & ATTR_MODE) |
| wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
| |
| if (iattr->ia_valid & ATTR_MTIME) |
| wstat.mtime = iattr->ia_mtime.tv_sec; |
| |
| if (iattr->ia_valid & ATTR_ATIME) |
| wstat.atime = iattr->ia_atime.tv_sec; |
| |
| if (iattr->ia_valid & ATTR_SIZE) |
| wstat.length = iattr->ia_size; |
| |
| if (v9fs_proto_dotu(v9ses)) { |
| if (iattr->ia_valid & ATTR_UID) |
| wstat.n_uid = iattr->ia_uid; |
| |
| if (iattr->ia_valid & ATTR_GID) |
| wstat.n_gid = iattr->ia_gid; |
| } |
| |
| retval = p9_client_wstat(fid, &wstat); |
| if (retval >= 0) |
| retval = inode_setattr(dentry->d_inode, iattr); |
| |
| return retval; |
| } |
| |
| /** |
| * v9fs_vfs_setattr_dotl - set file metadata |
| * @dentry: file whose metadata to set |
| * @iattr: metadata assignment structure |
| * |
| */ |
| |
| static int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) |
| { |
| int retval; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid; |
| struct p9_iattr_dotl p9attr; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, "\n"); |
| |
| retval = inode_change_ok(dentry->d_inode, iattr); |
| if (retval) |
| return retval; |
| |
| p9attr.valid = iattr->ia_valid; |
| p9attr.mode = iattr->ia_mode; |
| p9attr.uid = iattr->ia_uid; |
| p9attr.gid = iattr->ia_gid; |
| p9attr.size = iattr->ia_size; |
| p9attr.atime_sec = iattr->ia_atime.tv_sec; |
| p9attr.atime_nsec = iattr->ia_atime.tv_nsec; |
| p9attr.mtime_sec = iattr->ia_mtime.tv_sec; |
| p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; |
| |
| retval = -EPERM; |
| v9ses = v9fs_inode2v9ses(dentry->d_inode); |
| fid = v9fs_fid_lookup(dentry); |
| if (IS_ERR(fid)) |
| return PTR_ERR(fid); |
| |
| retval = p9_client_setattr(fid, &p9attr); |
| if (retval >= 0) |
| retval = inode_setattr(dentry->d_inode, iattr); |
| |
| return retval; |
| } |
| |
| /** |
| * v9fs_stat2inode - populate an inode structure with mistat info |
| * @stat: Plan 9 metadata (mistat) structure |
| * @inode: inode to populate |
| * @sb: superblock of filesystem |
| * |
| */ |
| |
| void |
| v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
| struct super_block *sb) |
| { |
| char ext[32]; |
| char tag_name[14]; |
| unsigned int i_nlink; |
| struct v9fs_session_info *v9ses = sb->s_fs_info; |
| |
| inode->i_nlink = 1; |
| |
| inode->i_atime.tv_sec = stat->atime; |
| inode->i_mtime.tv_sec = stat->mtime; |
| inode->i_ctime.tv_sec = stat->mtime; |
| |
| inode->i_uid = v9ses->dfltuid; |
| inode->i_gid = v9ses->dfltgid; |
| |
| if (v9fs_proto_dotu(v9ses)) { |
| inode->i_uid = stat->n_uid; |
| inode->i_gid = stat->n_gid; |
| } |
| if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { |
| if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { |
| /* |
| * Hadlink support got added later to |
| * to the .u extension. So there can be |
| * server out there that doesn't support |
| * this even with .u extension. So check |
| * for non NULL stat->extension |
| */ |
| strncpy(ext, stat->extension, sizeof(ext)); |
| /* HARDLINKCOUNT %u */ |
| sscanf(ext, "%13s %u", tag_name, &i_nlink); |
| if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) |
| inode->i_nlink = i_nlink; |
| } |
| } |
| inode->i_mode = p9mode2unixmode(v9ses, stat->mode); |
| if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { |
| char type = 0; |
| int major = -1; |
| int minor = -1; |
| |
| strncpy(ext, stat->extension, sizeof(ext)); |
| sscanf(ext, "%c %u %u", &type, &major, &minor); |
| switch (type) { |
| case 'c': |
| inode->i_mode &= ~S_IFBLK; |
| inode->i_mode |= S_IFCHR; |
| break; |
| case 'b': |
| break; |
| default: |
| P9_DPRINTK(P9_DEBUG_ERROR, |
| "Unknown special type %c %s\n", type, |
| stat->extension); |
| }; |
| inode->i_rdev = MKDEV(major, minor); |
| init_special_inode(inode, inode->i_mode, inode->i_rdev); |
| } else |
| inode->i_rdev = 0; |
| |
| i_size_write(inode, stat->length); |
| |
| /* not real number of blocks, but 512 byte ones ... */ |
| inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; |
| } |
| |
| /** |
| * v9fs_stat2inode_dotl - populate an inode structure with stat info |
| * @stat: stat structure |
| * @inode: inode to populate |
| * @sb: superblock of filesystem |
| * |
| */ |
| |
| void |
| v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode) |
| { |
| |
| if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { |
| inode->i_atime.tv_sec = stat->st_atime_sec; |
| inode->i_atime.tv_nsec = stat->st_atime_nsec; |
| inode->i_mtime.tv_sec = stat->st_mtime_sec; |
| inode->i_mtime.tv_nsec = stat->st_mtime_nsec; |
| inode->i_ctime.tv_sec = stat->st_ctime_sec; |
| inode->i_ctime.tv_nsec = stat->st_ctime_nsec; |
| inode->i_uid = stat->st_uid; |
| inode->i_gid = stat->st_gid; |
| inode->i_nlink = stat->st_nlink; |
| inode->i_mode = stat->st_mode; |
| inode->i_rdev = new_decode_dev(stat->st_rdev); |
| |
| if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) |
| init_special_inode(inode, inode->i_mode, inode->i_rdev); |
| |
| i_size_write(inode, stat->st_size); |
| inode->i_blocks = stat->st_blocks; |
| } else { |
| if (stat->st_result_mask & P9_STATS_ATIME) { |
| inode->i_atime.tv_sec = stat->st_atime_sec; |
| inode->i_atime.tv_nsec = stat->st_atime_nsec; |
| } |
| if (stat->st_result_mask & P9_STATS_MTIME) { |
| inode->i_mtime.tv_sec = stat->st_mtime_sec; |
| inode->i_mtime.tv_nsec = stat->st_mtime_nsec; |
| } |
| if (stat->st_result_mask & P9_STATS_CTIME) { |
| inode->i_ctime.tv_sec = stat->st_ctime_sec; |
| inode->i_ctime.tv_nsec = stat->st_ctime_nsec; |
| } |
| if (stat->st_result_mask & P9_STATS_UID) |
| inode->i_uid = stat->st_uid; |
| if (stat->st_result_mask & P9_STATS_GID) |
| inode->i_gid = stat->st_gid; |
| if (stat->st_result_mask & P9_STATS_NLINK) |
| inode->i_nlink = stat->st_nlink; |
| if (stat->st_result_mask & P9_STATS_MODE) { |
| inode->i_mode = stat->st_mode; |
| if ((S_ISBLK(inode->i_mode)) || |
| (S_ISCHR(inode->i_mode))) |
| init_special_inode(inode, inode->i_mode, |
| inode->i_rdev); |
| } |
| if (stat->st_result_mask & P9_STATS_RDEV) |
| inode->i_rdev = new_decode_dev(stat->st_rdev); |
| if (stat->st_result_mask & P9_STATS_SIZE) |
| i_size_write(inode, stat->st_size); |
| if (stat->st_result_mask & P9_STATS_BLOCKS) |
| inode->i_blocks = stat->st_blocks; |
| } |
| if (stat->st_result_mask & P9_STATS_GEN) |
| inode->i_generation = stat->st_gen; |
| |
| /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION |
| * because the inode structure does not have fields for them. |
| */ |
| } |
| |
| /** |
| * v9fs_qid2ino - convert qid into inode number |
| * @qid: qid to hash |
| * |
| * BUG: potential for inode number collisions? |
| */ |
| |
| ino_t v9fs_qid2ino(struct p9_qid *qid) |
| { |
| u64 path = qid->path + 2; |
| ino_t i = 0; |
| |
| if (sizeof(ino_t) == sizeof(path)) |
| memcpy(&i, &path, sizeof(ino_t)); |
| else |
| i = (ino_t) (path ^ (path >> 32)); |
| |
| return i; |
| } |
| |
| /** |
| * v9fs_readlink - read a symlink's location (internal version) |
| * @dentry: dentry for symlink |
| * @buffer: buffer to load symlink location into |
| * @buflen: length of buffer |
| * |
| */ |
| |
| static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) |
| { |
| int retval; |
| |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid; |
| struct p9_wstat *st; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
| retval = -EPERM; |
| v9ses = v9fs_inode2v9ses(dentry->d_inode); |
| fid = v9fs_fid_lookup(dentry); |
| if (IS_ERR(fid)) |
| return PTR_ERR(fid); |
| |
| if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) |
| return -EBADF; |
| |
| st = p9_client_stat(fid); |
| if (IS_ERR(st)) |
| return PTR_ERR(st); |
| |
| if (!(st->mode & P9_DMSYMLINK)) { |
| retval = -EINVAL; |
| goto done; |
| } |
| |
| /* copy extension buffer into buffer */ |
| strncpy(buffer, st->extension, buflen); |
| |
| P9_DPRINTK(P9_DEBUG_VFS, |
| "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); |
| |
| retval = strnlen(buffer, buflen); |
| done: |
| kfree(st); |
| return retval; |
| } |
| |
| /** |
| * v9fs_vfs_follow_link - follow a symlink path |
| * @dentry: dentry for symlink |
| * @nd: nameidata |
| * |
| */ |
| |
| static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) |
| { |
| int len = 0; |
| char *link = __getname(); |
| |
| P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); |
| |
| if (!link) |
| link = ERR_PTR(-ENOMEM); |
| else { |
| len = v9fs_readlink(dentry, link, PATH_MAX); |
| |
| if (len < 0) { |
| __putname(link); |
| link = ERR_PTR(len); |
| } else |
| link[min(len, PATH_MAX-1)] = 0; |
| } |
| nd_set_link(nd, link); |
| |
| return NULL; |
| } |
| |
| /** |
| * v9fs_vfs_put_link - release a symlink path |
| * @dentry: dentry for symlink |
| * @nd: nameidata |
| * @p: unused |
| * |
| */ |
| |
| static void |
| v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
| { |
| char *s = nd_get_link(nd); |
| |
| P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, |
| IS_ERR(s) ? "<error>" : s); |
| if (!IS_ERR(s)) |
| __putname(s); |
| } |
| |
| /** |
| * v9fs_vfs_mkspecial - create a special file |
| * @dir: inode to create special file in |
| * @dentry: dentry to create |
| * @mode: mode to create special file |
| * @extension: 9p2000.u format extension string representing special file |
| * |
| */ |
| |
| static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
| int mode, const char *extension) |
| { |
| u32 perm; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid; |
| |
| v9ses = v9fs_inode2v9ses(dir); |
| if (!v9fs_proto_dotu(v9ses)) { |
| P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); |
| return -EPERM; |
| } |
| |
| perm = unixmode2p9mode(v9ses, mode); |
| fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
| P9_OREAD); |
| if (IS_ERR(fid)) |
| return PTR_ERR(fid); |
| |
| p9_client_clunk(fid); |
| return 0; |
| } |
| |
| /** |
| * v9fs_vfs_symlink_dotl - helper function to create symlinks |
| * @dir: directory inode containing symlink |
| * @dentry: dentry for symlink |
| * @symname: symlink data |
| * |
| * See Also: 9P2000.L RFC for more information |
| * |
| */ |
| |
| static int |
| v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, |
| const char *symname) |
| { |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *dfid; |
| struct p9_fid *fid = NULL; |
| struct inode *inode; |
| struct p9_qid qid; |
| char *name; |
| int err; |
| gid_t gid; |
| |
| name = (char *) dentry->d_name.name; |
| P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n", |
| dir->i_ino, name, symname); |
| v9ses = v9fs_inode2v9ses(dir); |
| |
| dfid = v9fs_fid_lookup(dentry->d_parent); |
| if (IS_ERR(dfid)) { |
| err = PTR_ERR(dfid); |
| P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| return err; |
| } |
| |
| gid = v9fs_get_fsgid_for_create(dir); |
| |
| if (gid < 0) { |
| P9_DPRINTK(P9_DEBUG_VFS, "v9fs_get_egid failed %d\n", gid); |
| goto error; |
| } |
| |
| /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ |
| err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid); |
| |
| if (err < 0) { |
| P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); |
| goto error; |
| } |
| |
| if (v9ses->cache) { |
| /* Now walk from the parent so we can get an unopened fid. */ |
| fid = p9_client_walk(dfid, 1, &name, 1); |
| if (IS_ERR(fid)) { |
| err = PTR_ERR(fid); |
| P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", |
| err); |
| fid = NULL; |
| goto error; |
| } |
| |
| /* instantiate inode and assign the unopened fid to dentry */ |
| inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
| if (IS_ERR(inode)) { |
| err = PTR_ERR(inode); |
| P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", |
| err); |
| goto error; |
| } |
| dentry->d_op = &v9fs_cached_dentry_operations; |
| d_instantiate(dentry, inode); |
| err = v9fs_fid_add(dentry, fid); |
| if (err < 0) |
| goto error; |
| fid = NULL; |
| } else { |
| /* Not in cached mode. No need to populate inode with stat */ |
| inode = v9fs_get_inode(dir->i_sb, S_IFLNK); |
| if (IS_ERR(inode)) { |
| err = PTR_ERR(inode); |
| goto error; |
| } |
| dentry->d_op = &v9fs_dentry_operations; |
| d_instantiate(dentry, inode); |
| } |
| |
| error: |
| if (fid) |
| p9_client_clunk(fid); |
| |
| return err; |
| } |
| |
| /** |
| * v9fs_vfs_symlink - helper function to create symlinks |
| * @dir: directory inode containing symlink |
| * @dentry: dentry for symlink |
| * @symname: symlink data |
| * |
| * See Also: 9P2000.u RFC for more information |
| * |
| */ |
| |
| static int |
| v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
| { |
| P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, |
| dentry->d_name.name, symname); |
| |
| return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); |
| } |
| |
| /** |
| * v9fs_vfs_link - create a hardlink |
| * @old_dentry: dentry for file to link to |
| * @dir: inode destination for new link |
| * @dentry: dentry for link |
| * |
| */ |
| |
| static int |
| v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, |
| struct dentry *dentry) |
| { |
| int retval; |
| struct p9_fid *oldfid; |
| char *name; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, |
| " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, |
| old_dentry->d_name.name); |
| |
| oldfid = v9fs_fid_clone(old_dentry); |
| if (IS_ERR(oldfid)) |
| return PTR_ERR(oldfid); |
| |
| name = __getname(); |
| if (unlikely(!name)) { |
| retval = -ENOMEM; |
| goto clunk_fid; |
| } |
| |
| sprintf(name, "%d\n", oldfid->fid); |
| retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
| __putname(name); |
| |
| clunk_fid: |
| p9_client_clunk(oldfid); |
| return retval; |
| } |
| |
| /** |
| * v9fs_vfs_link_dotl - create a hardlink for dotl |
| * @old_dentry: dentry for file to link to |
| * @dir: inode destination for new link |
| * @dentry: dentry for link |
| * |
| */ |
| |
| static int |
| v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, |
| struct dentry *dentry) |
| { |
| int err; |
| struct p9_fid *dfid, *oldfid; |
| char *name; |
| struct v9fs_session_info *v9ses; |
| struct dentry *dir_dentry; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n", |
| dir->i_ino, old_dentry->d_name.name, |
| dentry->d_name.name); |
| |
| v9ses = v9fs_inode2v9ses(dir); |
| dir_dentry = v9fs_dentry_from_dir_inode(dir); |
| dfid = v9fs_fid_lookup(dir_dentry); |
| if (IS_ERR(dfid)) |
| return PTR_ERR(dfid); |
| |
| oldfid = v9fs_fid_lookup(old_dentry); |
| if (IS_ERR(oldfid)) |
| return PTR_ERR(oldfid); |
| |
| name = (char *) dentry->d_name.name; |
| |
| err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name); |
| |
| if (err < 0) { |
| P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); |
| return err; |
| } |
| |
| if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { |
| /* Get the latest stat info from server. */ |
| struct p9_fid *fid; |
| struct p9_stat_dotl *st; |
| |
| fid = v9fs_fid_lookup(old_dentry); |
| if (IS_ERR(fid)) |
| return PTR_ERR(fid); |
| |
| st = p9_client_getattr_dotl(fid, P9_STATS_BASIC); |
| if (IS_ERR(st)) |
| return PTR_ERR(st); |
| |
| v9fs_stat2inode_dotl(st, old_dentry->d_inode); |
| |
| kfree(st); |
| } else { |
| /* Caching disabled. No need to get upto date stat info. |
| * This dentry will be released immediately. So, just i_count++ |
| */ |
| atomic_inc(&old_dentry->d_inode->i_count); |
| } |
| |
| dentry->d_op = old_dentry->d_op; |
| d_instantiate(dentry, old_dentry->d_inode); |
| |
| return err; |
| } |
| |
| /** |
| * v9fs_vfs_mknod - create a special file |
| * @dir: inode destination for new link |
| * @dentry: dentry for file |
| * @mode: mode for creation |
| * @rdev: device associated with special file |
| * |
| */ |
| |
| static int |
| v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) |
| { |
| int retval; |
| char *name; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, |
| " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, |
| dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
| |
| if (!new_valid_dev(rdev)) |
| return -EINVAL; |
| |
| name = __getname(); |
| if (!name) |
| return -ENOMEM; |
| /* build extension */ |
| if (S_ISBLK(mode)) |
| sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
| else if (S_ISCHR(mode)) |
| sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
| else if (S_ISFIFO(mode)) |
| *name = 0; |
| else if (S_ISSOCK(mode)) |
| *name = 0; |
| else { |
| __putname(name); |
| return -EINVAL; |
| } |
| |
| retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); |
| __putname(name); |
| |
| return retval; |
| } |
| |
| /** |
| * v9fs_vfs_mknod_dotl - create a special file |
| * @dir: inode destination for new link |
| * @dentry: dentry for file |
| * @mode: mode for creation |
| * @rdev: device associated with special file |
| * |
| */ |
| static int |
| v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int mode, |
| dev_t rdev) |
| { |
| int err; |
| char *name; |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid = NULL, *dfid = NULL; |
| struct inode *inode; |
| gid_t gid; |
| struct p9_qid qid; |
| struct dentry *dir_dentry; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, |
| " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, |
| dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); |
| |
| if (!new_valid_dev(rdev)) |
| return -EINVAL; |
| |
| v9ses = v9fs_inode2v9ses(dir); |
| dir_dentry = v9fs_dentry_from_dir_inode(dir); |
| dfid = v9fs_fid_lookup(dir_dentry); |
| if (IS_ERR(dfid)) { |
| err = PTR_ERR(dfid); |
| P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| dfid = NULL; |
| goto error; |
| } |
| |
| gid = v9fs_get_fsgid_for_create(dir); |
| if (gid < 0) { |
| P9_DPRINTK(P9_DEBUG_VFS, "v9fs_get_fsgid_for_create failed\n"); |
| goto error; |
| } |
| |
| name = (char *) dentry->d_name.name; |
| |
| err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); |
| if (err < 0) |
| goto error; |
| |
| /* instantiate inode and assign the unopened fid to the dentry */ |
| if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { |
| fid = p9_client_walk(dfid, 1, &name, 1); |
| if (IS_ERR(fid)) { |
| err = PTR_ERR(fid); |
| P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", |
| err); |
| fid = NULL; |
| goto error; |
| } |
| |
| inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); |
| if (IS_ERR(inode)) { |
| err = PTR_ERR(inode); |
| P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", |
| err); |
| goto error; |
| } |
| dentry->d_op = &v9fs_cached_dentry_operations; |
| d_instantiate(dentry, inode); |
| err = v9fs_fid_add(dentry, fid); |
| if (err < 0) |
| goto error; |
| fid = NULL; |
| } else { |
| /* |
| * Not in cached mode. No need to populate inode with stat. |
| * socket syscall returns a fd, so we need instantiate |
| */ |
| inode = v9fs_get_inode(dir->i_sb, mode); |
| if (IS_ERR(inode)) { |
| err = PTR_ERR(inode); |
| goto error; |
| } |
| dentry->d_op = &v9fs_dentry_operations; |
| d_instantiate(dentry, inode); |
| } |
| |
| error: |
| if (fid) |
| p9_client_clunk(fid); |
| return err; |
| } |
| |
| static const struct inode_operations v9fs_dir_inode_operations_dotu = { |
| .create = v9fs_vfs_create, |
| .lookup = v9fs_vfs_lookup, |
| .symlink = v9fs_vfs_symlink, |
| .link = v9fs_vfs_link, |
| .unlink = v9fs_vfs_unlink, |
| .mkdir = v9fs_vfs_mkdir, |
| .rmdir = v9fs_vfs_rmdir, |
| .mknod = v9fs_vfs_mknod_dotl, |
| .rename = v9fs_vfs_rename, |
| .getattr = v9fs_vfs_getattr, |
| .setattr = v9fs_vfs_setattr, |
| }; |
| |
| static const struct inode_operations v9fs_dir_inode_operations_dotl = { |
| .create = v9fs_vfs_create_dotl, |
| .lookup = v9fs_vfs_lookup, |
| .link = v9fs_vfs_link_dotl, |
| .symlink = v9fs_vfs_symlink_dotl, |
| .unlink = v9fs_vfs_unlink, |
| .mkdir = v9fs_vfs_mkdir_dotl, |
| .rmdir = v9fs_vfs_rmdir, |
| .mknod = v9fs_vfs_mknod_dotl, |
| .rename = v9fs_vfs_rename, |
| .getattr = v9fs_vfs_getattr_dotl, |
| .setattr = v9fs_vfs_setattr_dotl, |
| .setxattr = generic_setxattr, |
| .getxattr = generic_getxattr, |
| .removexattr = generic_removexattr, |
| .listxattr = v9fs_listxattr, |
| |
| }; |
| |
| static const struct inode_operations v9fs_dir_inode_operations = { |
| .create = v9fs_vfs_create, |
| .lookup = v9fs_vfs_lookup, |
| .unlink = v9fs_vfs_unlink, |
| .mkdir = v9fs_vfs_mkdir, |
| .rmdir = v9fs_vfs_rmdir, |
| .mknod = v9fs_vfs_mknod, |
| .rename = v9fs_vfs_rename, |
| .getattr = v9fs_vfs_getattr, |
| .setattr = v9fs_vfs_setattr, |
| }; |
| |
| static const struct inode_operations v9fs_file_inode_operations = { |
| .getattr = v9fs_vfs_getattr, |
| .setattr = v9fs_vfs_setattr, |
| }; |
| |
| static const struct inode_operations v9fs_file_inode_operations_dotl = { |
| .getattr = v9fs_vfs_getattr_dotl, |
| .setattr = v9fs_vfs_setattr_dotl, |
| .setxattr = generic_setxattr, |
| .getxattr = generic_getxattr, |
| .removexattr = generic_removexattr, |
| .listxattr = v9fs_listxattr, |
| }; |
| |
| static const struct inode_operations v9fs_symlink_inode_operations = { |
| .readlink = generic_readlink, |
| .follow_link = v9fs_vfs_follow_link, |
| .put_link = v9fs_vfs_put_link, |
| .getattr = v9fs_vfs_getattr, |
| .setattr = v9fs_vfs_setattr, |
| }; |
| |
| static const struct inode_operations v9fs_symlink_inode_operations_dotl = { |
| .readlink = generic_readlink, |
| .follow_link = v9fs_vfs_follow_link, |
| .put_link = v9fs_vfs_put_link, |
| .getattr = v9fs_vfs_getattr_dotl, |
| .setattr = v9fs_vfs_setattr_dotl, |
| .setxattr = generic_setxattr, |
| .getxattr = generic_getxattr, |
| .removexattr = generic_removexattr, |
| .listxattr = v9fs_listxattr, |
| }; |