--- /dev/null
+/*
+ * 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 <linux/magic.h>
+#include <net/9p/9p.h>
+#include <net/9p/client.h>
+
+#include "v9fs.h"
+#include "v9fs_vfs.h"
+#include "fid.h"
+#include "xattr.h"
+#include "acl.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_mount()
+ *
+ */
+
+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;
+ sb->s_xattr = v9fs_xattr_handlers;
+ } else
+ sb->s_op = &v9fs_super_ops;
+ sb->s_bdi = &v9ses->bdi;
+ if (v9ses->cache)
+ sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024)/PAGE_CACHE_SIZE;
+
+ sb->s_flags |= MS_ACTIVE | MS_DIRSYNC | MS_NOATIME;
+ if (!v9ses->cache)
+ sb->s_flags |= MS_SYNCHRONOUS;
+
+#ifdef CONFIG_9P_FS_POSIX_ACL
+ if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL)
+ sb->s_flags |= MS_POSIXACL;
+#endif
+
+ save_mount_options(sb, data);
+}
+
+/**
+ * v9fs_mount - mount a superblock
+ * @fs_type: file system type
+ * @flags: mount flags
+ * @dev_name: device name that was mounted
+ * @data: mount options
+ *
+ */
+
+static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *data)
+{
+ struct super_block *sb = NULL;
+ struct inode *inode = NULL;
+ struct dentry *root = NULL;
+ struct v9fs_session_info *v9ses = NULL;
+ umode_t mode = S_IRWXUGO | S_ISVTX;
+ struct p9_fid *fid;
+ int retval = 0;
+
+ p9_debug(P9_DEBUG_VFS, "\n");
+
+ v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
+ if (!v9ses)
+ return ERR_PTR(-ENOMEM);
+
+ fid = v9fs_session_init(v9ses, dev_name, data);
+ if (IS_ERR(fid)) {
+ retval = PTR_ERR(fid);
+ /*
+ * we need to call session_close to tear down some
+ * of the data structure setup by session_init
+ */
+ goto close_session;
+ }
+
+ sb = sget(fs_type, NULL, v9fs_set_super, flags, v9ses);
+ if (IS_ERR(sb)) {
+ retval = PTR_ERR(sb);
+ goto clunk_fid;
+ }
+ v9fs_fill_super(sb, v9ses, flags, data);
+
+ if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
+ sb->s_d_op = &v9fs_cached_dentry_operations;
+ else
+ sb->s_d_op = &v9fs_dentry_operations;
+
+ inode = v9fs_get_inode(sb, S_IFDIR | mode, 0);
+ if (IS_ERR(inode)) {
+ retval = PTR_ERR(inode);
+ goto release_sb;
+ }
+
+ root = d_make_root(inode);
+ if (!root) {
+ retval = -ENOMEM;
+ goto release_sb;
+ }
+ sb->s_root = root;
+ if (v9fs_proto_dotl(v9ses)) {
+ struct p9_stat_dotl *st = NULL;
+ st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
+ if (IS_ERR(st)) {
+ retval = PTR_ERR(st);
+ goto release_sb;
+ }
+ d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
+ v9fs_stat2inode_dotl(st, d_inode(root));
+ kfree(st);
+ } else {
+ struct p9_wstat *st = NULL;
+ st = p9_client_stat(fid);
+ if (IS_ERR(st)) {
+ retval = PTR_ERR(st);
+ goto release_sb;
+ }
+
+ d_inode(root)->i_ino = v9fs_qid2ino(&st->qid);
+ v9fs_stat2inode(st, d_inode(root), sb);
+
+ p9stat_free(st);
+ kfree(st);
+ }
+ retval = v9fs_get_acl(inode, fid);
+ if (retval)
+ goto release_sb;
+ v9fs_fid_add(root, fid);
+
+ p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n");
+ return dget(sb->s_root);
+
+clunk_fid:
+ p9_client_clunk(fid);
+close_session:
+ v9fs_session_close(v9ses);
+ kfree(v9ses);
+ return ERR_PTR(retval);
+
+release_sb:
+ /*
+ * we will do the session_close and root dentry release
+ * in the below call. But we need to clunk fid, because we haven't
+ * attached the fid to dentry so it won't get clunked
+ * automatically.
+ */
+ p9_client_clunk(fid);
+ deactivate_locked_super(sb);
+ return ERR_PTR(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_debug(P9_DEBUG_VFS, " %p\n", s);
+
+ kill_anon_super(s);
+
+ v9fs_session_cancel(v9ses);
+ v9fs_session_close(v9ses);
+ kfree(v9ses);
+ s->s_fs_info = NULL;
+ p9_debug(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_dentry2v9ses(dentry);
+ 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 int v9fs_drop_inode(struct inode *inode)
+{
+ struct v9fs_session_info *v9ses;
+ v9ses = v9fs_inode2v9ses(inode);
+ if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
+ return generic_drop_inode(inode);
+ /*
+ * in case of non cached mode always drop the
+ * the inode because we want the inode attribute
+ * to always match that on the server.
+ */
+ return 1;
+}
+
+static int v9fs_write_inode(struct inode *inode,
+ struct writeback_control *wbc)
+{
+ int ret;
+ struct p9_wstat wstat;
+ struct v9fs_inode *v9inode;
+ /*
+ * send an fsync request to server irrespective of
+ * wbc->sync_mode.
+ */
+ p9_debug(P9_DEBUG_VFS, "%s: inode %p\n", __func__, inode);
+ v9inode = V9FS_I(inode);
+ if (!v9inode->writeback_fid)
+ return 0;
+ v9fs_blank_wstat(&wstat);
+
+ ret = p9_client_wstat(v9inode->writeback_fid, &wstat);
+ if (ret < 0) {
+ __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
+ return ret;
+ }
+ return 0;
+}
+
+static int v9fs_write_inode_dotl(struct inode *inode,
+ struct writeback_control *wbc)
+{
+ int ret;
+ struct v9fs_inode *v9inode;
+ /*
+ * send an fsync request to server irrespective of
+ * wbc->sync_mode.
+ */
+ v9inode = V9FS_I(inode);
+ p9_debug(P9_DEBUG_VFS, "%s: inode %p, writeback_fid %p\n",
+ __func__, inode, v9inode->writeback_fid);
+ if (!v9inode->writeback_fid)
+ return 0;
+
+ ret = p9_client_fsync(v9inode->writeback_fid, 0);
+ if (ret < 0) {
+ __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
+ return ret;
+ }
+ return 0;
+}
+
+static const struct super_operations v9fs_super_ops = {
+ .alloc_inode = v9fs_alloc_inode,
+ .destroy_inode = v9fs_destroy_inode,
+ .statfs = simple_statfs,
+ .evict_inode = v9fs_evict_inode,
+ .show_options = generic_show_options,
+ .umount_begin = v9fs_umount_begin,
+ .write_inode = v9fs_write_inode,
+};
+
+static const struct super_operations v9fs_super_ops_dotl = {
+ .alloc_inode = v9fs_alloc_inode,
+ .destroy_inode = v9fs_destroy_inode,
+ .statfs = v9fs_statfs,
+ .drop_inode = v9fs_drop_inode,
+ .evict_inode = v9fs_evict_inode,
+ .show_options = generic_show_options,
+ .umount_begin = v9fs_umount_begin,
+ .write_inode = v9fs_write_inode_dotl,
+};
+
+struct file_system_type v9fs_fs_type = {
+ .name = "9p",
+ .mount = v9fs_mount,
+ .kill_sb = v9fs_kill_super,
+ .owner = THIS_MODULE,
+ .fs_flags = FS_RENAME_DOES_D_MOVE,
+};
+MODULE_ALIAS_FS("9p");
Code Review / kvmfornfv.git / blobdiff