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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 00000000000..c476fde33fb
--- /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 v1.2.3 (git 2.25.1) at 2024-04-25 19:10:54 +0000