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-rw-r--r--fs/afs/inode.c287
1 files changed, 287 insertions, 0 deletions
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
new file mode 100644
index 000000000000..c476fde33fbc
--- /dev/null
+++ b/fs/afs/inode.c
@@ -0,0 +1,287 @@
+/*
+ * 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/sched.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	= &afs_file_file_operations;
+		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_blksize	= PAGE_CACHE_SIZE;
+	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() */
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-09-28 11:24:58 +0000