You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
285 lines
6.8 KiB
285 lines
6.8 KiB
/*
|
|
* Copyright (c) 2002 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* This software may be freely redistributed under the terms of the
|
|
* GNU General Public License.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* Authors: David Woodhouse <dwmw2@cambridge.redhat.com>
|
|
* David Howells <dhowells@redhat.com>
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/pagemap.h>
|
|
#include "volume.h"
|
|
#include "vnode.h"
|
|
#include "super.h"
|
|
#include "internal.h"
|
|
|
|
struct afs_iget_data {
|
|
struct afs_fid fid;
|
|
struct afs_volume *volume; /* volume on which resides */
|
|
};
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* map the AFS file status to the inode member variables
|
|
*/
|
|
static int afs_inode_map_status(struct afs_vnode *vnode)
|
|
{
|
|
struct inode *inode = AFS_VNODE_TO_I(vnode);
|
|
|
|
_debug("FS: ft=%d lk=%d sz=%Zu ver=%Lu mod=%hu",
|
|
vnode->status.type,
|
|
vnode->status.nlink,
|
|
vnode->status.size,
|
|
vnode->status.version,
|
|
vnode->status.mode);
|
|
|
|
switch (vnode->status.type) {
|
|
case AFS_FTYPE_FILE:
|
|
inode->i_mode = S_IFREG | vnode->status.mode;
|
|
inode->i_op = &afs_file_inode_operations;
|
|
inode->i_fop = &generic_ro_fops;
|
|
break;
|
|
case AFS_FTYPE_DIR:
|
|
inode->i_mode = S_IFDIR | vnode->status.mode;
|
|
inode->i_op = &afs_dir_inode_operations;
|
|
inode->i_fop = &afs_dir_file_operations;
|
|
break;
|
|
case AFS_FTYPE_SYMLINK:
|
|
inode->i_mode = S_IFLNK | vnode->status.mode;
|
|
inode->i_op = &page_symlink_inode_operations;
|
|
break;
|
|
default:
|
|
printk("kAFS: AFS vnode with undefined type\n");
|
|
return -EBADMSG;
|
|
}
|
|
|
|
inode->i_nlink = vnode->status.nlink;
|
|
inode->i_uid = vnode->status.owner;
|
|
inode->i_gid = 0;
|
|
inode->i_size = vnode->status.size;
|
|
inode->i_ctime.tv_sec = vnode->status.mtime_server;
|
|
inode->i_ctime.tv_nsec = 0;
|
|
inode->i_atime = inode->i_mtime = inode->i_ctime;
|
|
inode->i_blocks = 0;
|
|
inode->i_version = vnode->fid.unique;
|
|
inode->i_mapping->a_ops = &afs_fs_aops;
|
|
|
|
/* check to see whether a symbolic link is really a mountpoint */
|
|
if (vnode->status.type == AFS_FTYPE_SYMLINK) {
|
|
afs_mntpt_check_symlink(vnode);
|
|
|
|
if (vnode->flags & AFS_VNODE_MOUNTPOINT) {
|
|
inode->i_mode = S_IFDIR | vnode->status.mode;
|
|
inode->i_op = &afs_mntpt_inode_operations;
|
|
inode->i_fop = &afs_mntpt_file_operations;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
} /* end afs_inode_map_status() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* attempt to fetch the status of an inode, coelescing multiple simultaneous
|
|
* fetches
|
|
*/
|
|
static int afs_inode_fetch_status(struct inode *inode)
|
|
{
|
|
struct afs_vnode *vnode;
|
|
int ret;
|
|
|
|
vnode = AFS_FS_I(inode);
|
|
|
|
ret = afs_vnode_fetch_status(vnode);
|
|
|
|
if (ret == 0)
|
|
ret = afs_inode_map_status(vnode);
|
|
|
|
return ret;
|
|
|
|
} /* end afs_inode_fetch_status() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* iget5() comparator
|
|
*/
|
|
static int afs_iget5_test(struct inode *inode, void *opaque)
|
|
{
|
|
struct afs_iget_data *data = opaque;
|
|
|
|
return inode->i_ino == data->fid.vnode &&
|
|
inode->i_version == data->fid.unique;
|
|
} /* end afs_iget5_test() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* iget5() inode initialiser
|
|
*/
|
|
static int afs_iget5_set(struct inode *inode, void *opaque)
|
|
{
|
|
struct afs_iget_data *data = opaque;
|
|
struct afs_vnode *vnode = AFS_FS_I(inode);
|
|
|
|
inode->i_ino = data->fid.vnode;
|
|
inode->i_version = data->fid.unique;
|
|
vnode->fid = data->fid;
|
|
vnode->volume = data->volume;
|
|
|
|
return 0;
|
|
} /* end afs_iget5_set() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* inode retrieval
|
|
*/
|
|
inline int afs_iget(struct super_block *sb, struct afs_fid *fid,
|
|
struct inode **_inode)
|
|
{
|
|
struct afs_iget_data data = { .fid = *fid };
|
|
struct afs_super_info *as;
|
|
struct afs_vnode *vnode;
|
|
struct inode *inode;
|
|
int ret;
|
|
|
|
_enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique);
|
|
|
|
as = sb->s_fs_info;
|
|
data.volume = as->volume;
|
|
|
|
inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
|
|
&data);
|
|
if (!inode) {
|
|
_leave(" = -ENOMEM");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
vnode = AFS_FS_I(inode);
|
|
|
|
/* deal with an existing inode */
|
|
if (!(inode->i_state & I_NEW)) {
|
|
ret = afs_vnode_fetch_status(vnode);
|
|
if (ret==0)
|
|
*_inode = inode;
|
|
else
|
|
iput(inode);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef AFS_CACHING_SUPPORT
|
|
/* set up caching before reading the status, as fetch-status reads the
|
|
* first page of symlinks to see if they're really mntpts */
|
|
cachefs_acquire_cookie(vnode->volume->cache,
|
|
NULL,
|
|
vnode,
|
|
&vnode->cache);
|
|
#endif
|
|
|
|
/* okay... it's a new inode */
|
|
inode->i_flags |= S_NOATIME;
|
|
vnode->flags |= AFS_VNODE_CHANGED;
|
|
ret = afs_inode_fetch_status(inode);
|
|
if (ret<0)
|
|
goto bad_inode;
|
|
|
|
/* success */
|
|
unlock_new_inode(inode);
|
|
|
|
*_inode = inode;
|
|
_leave(" = 0 [CB { v=%u x=%lu t=%u }]",
|
|
vnode->cb_version,
|
|
vnode->cb_timeout.timo_jif,
|
|
vnode->cb_type);
|
|
return 0;
|
|
|
|
/* failure */
|
|
bad_inode:
|
|
make_bad_inode(inode);
|
|
unlock_new_inode(inode);
|
|
iput(inode);
|
|
|
|
_leave(" = %d [bad]", ret);
|
|
return ret;
|
|
} /* end afs_iget() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* read the attributes of an inode
|
|
*/
|
|
int afs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
|
|
struct kstat *stat)
|
|
{
|
|
struct afs_vnode *vnode;
|
|
struct inode *inode;
|
|
int ret;
|
|
|
|
inode = dentry->d_inode;
|
|
|
|
_enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version);
|
|
|
|
vnode = AFS_FS_I(inode);
|
|
|
|
ret = afs_inode_fetch_status(inode);
|
|
if (ret == -ENOENT) {
|
|
_leave(" = %d [%d %p]",
|
|
ret, atomic_read(&dentry->d_count), dentry->d_inode);
|
|
return ret;
|
|
}
|
|
else if (ret < 0) {
|
|
make_bad_inode(inode);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* transfer attributes from the inode structure to the stat
|
|
* structure */
|
|
generic_fillattr(inode, stat);
|
|
|
|
_leave(" = 0 CB { v=%u x=%u t=%u }",
|
|
vnode->cb_version,
|
|
vnode->cb_expiry,
|
|
vnode->cb_type);
|
|
|
|
return 0;
|
|
} /* end afs_inode_getattr() */
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* clear an AFS inode
|
|
*/
|
|
void afs_clear_inode(struct inode *inode)
|
|
{
|
|
struct afs_vnode *vnode;
|
|
|
|
vnode = AFS_FS_I(inode);
|
|
|
|
_enter("ino=%lu { vn=%08x v=%u x=%u t=%u }",
|
|
inode->i_ino,
|
|
vnode->fid.vnode,
|
|
vnode->cb_version,
|
|
vnode->cb_expiry,
|
|
vnode->cb_type
|
|
);
|
|
|
|
BUG_ON(inode->i_ino != vnode->fid.vnode);
|
|
|
|
afs_vnode_give_up_callback(vnode);
|
|
|
|
#ifdef AFS_CACHING_SUPPORT
|
|
cachefs_relinquish_cookie(vnode->cache, 0);
|
|
vnode->cache = NULL;
|
|
#endif
|
|
|
|
_leave("");
|
|
} /* end afs_clear_inode() */
|
|
|