mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
7ff3c20468
When the user uses some syscall, for example mmap(v9fs_file_mmap), it will not update atime even if user's was set mnt_flags without MNT_NOATIME, because v9fs defaults to settine SB_NOATIME in v9fs_set_super. For supporting access time updating when the user mounts with relatime, we should not set SB_NOATIME by default. Link: http://lkml.kernel.org/r/5AB9A377.6080906@huawei.com Signed-off-by: Yiwen Jiang <jiangyiwen@huawei.com> Reviewed-by: Greg Kurz <groug@kaod.org> Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Ron Minnich <rminnich@sandia.gov> Cc: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
374 lines
8.6 KiB
C
374 lines
8.6 KiB
C
/*
|
|
* 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/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 int
|
|
v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
|
|
int flags, void *data)
|
|
{
|
|
int ret;
|
|
|
|
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;
|
|
|
|
ret = super_setup_bdi(sb);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (v9ses->cache)
|
|
sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024)/PAGE_SIZE;
|
|
|
|
sb->s_flags |= SB_ACTIVE | SB_DIRSYNC;
|
|
if (!v9ses->cache)
|
|
sb->s_flags |= SB_SYNCHRONOUS;
|
|
|
|
#ifdef CONFIG_9P_FS_POSIX_ACL
|
|
if ((v9ses->flags & V9FS_ACL_MASK) == V9FS_POSIX_ACL)
|
|
sb->s_flags |= SB_POSIXACL;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
goto free_session;
|
|
}
|
|
|
|
sb = sget(fs_type, NULL, v9fs_set_super, flags, v9ses);
|
|
if (IS_ERR(sb)) {
|
|
retval = PTR_ERR(sb);
|
|
goto clunk_fid;
|
|
}
|
|
retval = v9fs_fill_super(sb, v9ses, flags, data);
|
|
if (retval)
|
|
goto release_sb;
|
|
|
|
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);
|
|
v9fs_session_close(v9ses);
|
|
free_session:
|
|
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 = v9fs_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 = v9fs_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");
|