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