| /* |
| * linux/fs/9p/vfs_super.c |
| * |
| * This file contians superblock ops for 9P2000. It is intended that |
| * you mount this file system on directories. |
| * |
| * 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/kernel.h> |
| #include <linux/module.h> |
| #include <linux/errno.h> |
| #include <linux/fs.h> |
| #include <linux/file.h> |
| #include <linux/stat.h> |
| #include <linux/string.h> |
| #include <linux/inet.h> |
| #include <linux/pagemap.h> |
| #include <linux/seq_file.h> |
| #include <linux/mount.h> |
| #include <linux/idr.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/statfs.h> |
| #include <net/9p/9p.h> |
| #include <net/9p/client.h> |
| |
| #include "v9fs.h" |
| #include "v9fs_vfs.h" |
| #include "fid.h" |
| |
| static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl; |
| |
| /** |
| * v9fs_set_super - set the superblock |
| * @s: super block |
| * @data: file system specific data |
| * |
| */ |
| |
| static int v9fs_set_super(struct super_block *s, void *data) |
| { |
| s->s_fs_info = data; |
| return set_anon_super(s, data); |
| } |
| |
| /** |
| * v9fs_fill_super - populate superblock with info |
| * @sb: superblock |
| * @v9ses: session information |
| * @flags: flags propagated from v9fs_get_sb() |
| * |
| */ |
| |
| static void |
| v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses, |
| int flags, void *data) |
| { |
| sb->s_maxbytes = MAX_LFS_FILESIZE; |
| sb->s_blocksize_bits = fls(v9ses->maxdata - 1); |
| sb->s_blocksize = 1 << sb->s_blocksize_bits; |
| sb->s_magic = V9FS_MAGIC; |
| if (v9fs_proto_dotl(v9ses)) |
| sb->s_op = &v9fs_super_ops_dotl; |
| else |
| sb->s_op = &v9fs_super_ops; |
| sb->s_bdi = &v9ses->bdi; |
| |
| sb->s_flags = flags | MS_ACTIVE | MS_SYNCHRONOUS | MS_DIRSYNC | |
| MS_NOATIME; |
| |
| save_mount_options(sb, data); |
| } |
| |
| /** |
| * v9fs_get_sb - mount a superblock |
| * @fs_type: file system type |
| * @flags: mount flags |
| * @dev_name: device name that was mounted |
| * @data: mount options |
| * @mnt: mountpoint record to be instantiated |
| * |
| */ |
| |
| static int v9fs_get_sb(struct file_system_type *fs_type, int flags, |
| const char *dev_name, void *data, |
| struct vfsmount *mnt) |
| { |
| struct super_block *sb = NULL; |
| struct inode *inode = NULL; |
| struct dentry *root = NULL; |
| struct v9fs_session_info *v9ses = NULL; |
| struct p9_wstat *st = NULL; |
| int mode = S_IRWXUGO | S_ISVTX; |
| struct p9_fid *fid; |
| int retval = 0; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, " \n"); |
| |
| v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL); |
| if (!v9ses) |
| return -ENOMEM; |
| |
| fid = v9fs_session_init(v9ses, dev_name, data); |
| if (IS_ERR(fid)) { |
| retval = PTR_ERR(fid); |
| goto close_session; |
| } |
| |
| st = p9_client_stat(fid); |
| if (IS_ERR(st)) { |
| retval = PTR_ERR(st); |
| goto clunk_fid; |
| } |
| |
| sb = sget(fs_type, NULL, v9fs_set_super, v9ses); |
| if (IS_ERR(sb)) { |
| retval = PTR_ERR(sb); |
| goto free_stat; |
| } |
| v9fs_fill_super(sb, v9ses, flags, data); |
| |
| inode = v9fs_get_inode(sb, S_IFDIR | mode); |
| if (IS_ERR(inode)) { |
| retval = PTR_ERR(inode); |
| goto release_sb; |
| } |
| |
| root = d_alloc_root(inode); |
| if (!root) { |
| iput(inode); |
| retval = -ENOMEM; |
| goto release_sb; |
| } |
| |
| sb->s_root = root; |
| root->d_inode->i_ino = v9fs_qid2ino(&st->qid); |
| |
| v9fs_stat2inode(st, root->d_inode, sb); |
| |
| v9fs_fid_add(root, fid); |
| p9stat_free(st); |
| kfree(st); |
| |
| P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n"); |
| simple_set_mnt(mnt, sb); |
| return 0; |
| |
| free_stat: |
| p9stat_free(st); |
| kfree(st); |
| |
| clunk_fid: |
| p9_client_clunk(fid); |
| |
| close_session: |
| v9fs_session_close(v9ses); |
| kfree(v9ses); |
| return retval; |
| |
| release_sb: |
| p9stat_free(st); |
| kfree(st); |
| deactivate_locked_super(sb); |
| return retval; |
| } |
| |
| /** |
| * v9fs_kill_super - Kill Superblock |
| * @s: superblock |
| * |
| */ |
| |
| static void v9fs_kill_super(struct super_block *s) |
| { |
| struct v9fs_session_info *v9ses = s->s_fs_info; |
| |
| P9_DPRINTK(P9_DEBUG_VFS, " %p\n", s); |
| |
| if (s->s_root) |
| v9fs_dentry_release(s->s_root); /* clunk root */ |
| |
| kill_anon_super(s); |
| |
| v9fs_session_cancel(v9ses); |
| v9fs_session_close(v9ses); |
| kfree(v9ses); |
| s->s_fs_info = NULL; |
| P9_DPRINTK(P9_DEBUG_VFS, "exiting kill_super\n"); |
| } |
| |
| static void |
| v9fs_umount_begin(struct super_block *sb) |
| { |
| struct v9fs_session_info *v9ses; |
| |
| v9ses = sb->s_fs_info; |
| v9fs_session_begin_cancel(v9ses); |
| } |
| |
| static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| { |
| struct v9fs_session_info *v9ses; |
| struct p9_fid *fid; |
| struct p9_rstatfs rs; |
| int res; |
| |
| fid = v9fs_fid_lookup(dentry); |
| if (IS_ERR(fid)) { |
| res = PTR_ERR(fid); |
| goto done; |
| } |
| |
| v9ses = v9fs_inode2v9ses(dentry->d_inode); |
| if (v9fs_proto_dotl(v9ses)) { |
| res = p9_client_statfs(fid, &rs); |
| if (res == 0) { |
| buf->f_type = rs.type; |
| buf->f_bsize = rs.bsize; |
| buf->f_blocks = rs.blocks; |
| buf->f_bfree = rs.bfree; |
| buf->f_bavail = rs.bavail; |
| buf->f_files = rs.files; |
| buf->f_ffree = rs.ffree; |
| buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL; |
| buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL; |
| buf->f_namelen = rs.namelen; |
| } |
| if (res != -ENOSYS) |
| goto done; |
| } |
| res = simple_statfs(dentry, buf); |
| done: |
| return res; |
| } |
| |
| static const struct super_operations v9fs_super_ops = { |
| #ifdef CONFIG_9P_FSCACHE |
| .alloc_inode = v9fs_alloc_inode, |
| .destroy_inode = v9fs_destroy_inode, |
| #endif |
| .statfs = simple_statfs, |
| .evict_inode = v9fs_evict_inode, |
| .show_options = generic_show_options, |
| .umount_begin = v9fs_umount_begin, |
| }; |
| |
| static const struct super_operations v9fs_super_ops_dotl = { |
| #ifdef CONFIG_9P_FSCACHE |
| .alloc_inode = v9fs_alloc_inode, |
| .destroy_inode = v9fs_destroy_inode, |
| #endif |
| .statfs = v9fs_statfs, |
| .evict_inode = v9fs_evict_inode, |
| .show_options = generic_show_options, |
| .umount_begin = v9fs_umount_begin, |
| }; |
| |
| struct file_system_type v9fs_fs_type = { |
| .name = "9p", |
| .get_sb = v9fs_get_sb, |
| .kill_sb = v9fs_kill_super, |
| .owner = THIS_MODULE, |
| }; |