#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
+#include <linux/sched.h>
#include "internal.h"
struct afs_iget_data {
{
struct inode *inode = AFS_VNODE_TO_I(vnode);
- _debug("FS: ft=%d lk=%d sz=%Zu ver=%Lu mod=%hu",
+ _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
vnode->status.type,
vnode->status.nlink,
- vnode->status.size,
+ (unsigned long long) vnode->status.size,
vnode->status.data_version,
vnode->status.mode);
/*
* inode retrieval
*/
-inline struct inode *afs_iget(struct super_block *sb, struct key *key,
- struct afs_fid *fid)
+struct inode *afs_iget(struct super_block *sb, struct key *key,
+ struct afs_fid *fid, struct afs_file_status *status,
+ struct afs_callback *cb)
{
struct afs_iget_data data = { .fid = *fid };
struct afs_super_info *as;
struct inode *inode;
int ret;
- _enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique);
+ _enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);
as = sb->s_fs_info;
data.volume = as->volume;
&vnode->cache);
#endif
- /* okay... it's a new inode */
- set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
- ret = afs_vnode_fetch_status(vnode, NULL, key);
- if (ret < 0)
- goto bad_inode;
+ if (!status) {
+ /* it's a remotely extant inode */
+ set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
+ ret = afs_vnode_fetch_status(vnode, NULL, key);
+ if (ret < 0)
+ goto bad_inode;
+ } else {
+ /* it's an inode we just created */
+ memcpy(&vnode->status, status, sizeof(vnode->status));
+
+ if (!cb) {
+ /* it's a symlink we just created (the fileserver
+ * didn't give us a callback) */
+ vnode->cb_version = 0;
+ vnode->cb_expiry = 0;
+ vnode->cb_type = 0;
+ vnode->cb_expires = get_seconds();
+ } else {
+ vnode->cb_version = cb->version;
+ vnode->cb_expiry = cb->expiry;
+ vnode->cb_type = cb->type;
+ vnode->cb_expires = vnode->cb_expiry + get_seconds();
+ }
+ }
+
ret = afs_inode_map_status(vnode, key);
if (ret < 0)
goto bad_inode;
/* success */
+ clear_bit(AFS_VNODE_UNSET, &vnode->flags);
inode->i_flags |= S_NOATIME;
unlock_new_inode(inode);
_leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
}
/*
+ * mark the data attached to an inode as obsolete due to a write on the server
+ * - might also want to ditch all the outstanding writes and dirty pages
+ */
+void afs_zap_data(struct afs_vnode *vnode)
+{
+ _enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);
+
+ /* nuke all the non-dirty pages that aren't locked, mapped or being
+ * written back in a regular file and completely discard the pages in a
+ * directory or symlink */
+ if (S_ISREG(vnode->vfs_inode.i_mode))
+ invalidate_remote_inode(&vnode->vfs_inode);
+ else
+ invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
+}
+
+/*
+ * validate a vnode/inode
+ * - there are several things we need to check
+ * - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
+ * symlink)
+ * - parent dir metadata changed (security changes)
+ * - dentry data changed (write, truncate)
+ * - dentry metadata changed (security changes)
+ */
+int afs_validate(struct afs_vnode *vnode, struct key *key)
+{
+ int ret;
+
+ _enter("{v={%x:%u} fl=%lx},%x",
+ vnode->fid.vid, vnode->fid.vnode, vnode->flags,
+ key_serial(key));
+
+ if (vnode->cb_promised &&
+ !test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
+ !test_bit(AFS_VNODE_MODIFIED, &vnode->flags) &&
+ !test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
+ if (vnode->cb_expires < get_seconds() + 10) {
+ _debug("callback expired");
+ set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
+ } else {
+ goto valid;
+ }
+ }
+
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
+ goto valid;
+
+ mutex_lock(&vnode->validate_lock);
+
+ /* if the promise has expired, we need to check the server again to get
+ * a new promise - note that if the (parent) directory's metadata was
+ * changed then the security may be different and we may no longer have
+ * access */
+ if (!vnode->cb_promised ||
+ test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
+ _debug("not promised");
+ ret = afs_vnode_fetch_status(vnode, NULL, key);
+ if (ret < 0)
+ goto error_unlock;
+ _debug("new promise [fl=%lx]", vnode->flags);
+ }
+
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
+ _debug("file already deleted");
+ ret = -ESTALE;
+ goto error_unlock;
+ }
+
+ /* if the vnode's data version number changed then its contents are
+ * different */
+ if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
+ afs_zap_data(vnode);
+
+ clear_bit(AFS_VNODE_MODIFIED, &vnode->flags);
+ mutex_unlock(&vnode->validate_lock);
+valid:
+ _leave(" = 0");
+ return 0;
+
+error_unlock:
+ mutex_unlock(&vnode->validate_lock);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
* read the attributes of an inode
*/
-int afs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
+int afs_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat)
{
struct inode *inode;
vnode = AFS_FS_I(inode);
- _enter("ino=%lu { vn=%08x v=%u x=%u t=%u }",
- inode->i_ino,
+ _enter("{%x:%u.%d} v=%u x=%u t=%u }",
+ vnode->fid.vid,
vnode->fid.vnode,
+ vnode->fid.unique,
vnode->cb_version,
vnode->cb_expiry,
vnode->cb_type);
vnode->server = NULL;
}
+ ASSERT(list_empty(&vnode->writebacks));
ASSERT(!vnode->cb_promised);
#ifdef AFS_CACHING_SUPPORT
_leave("");
}
+
+/*
+ * set the attributes of an inode
+ */
+int afs_setattr(struct dentry *dentry, struct iattr *attr)
+{
+ struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
+ struct key *key;
+ int ret;
+
+ _enter("{%x:%u},{n=%s},%x",
+ vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
+ attr->ia_valid);
+
+ if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
+ ATTR_MTIME))) {
+ _leave(" = 0 [unsupported]");
+ return 0;
+ }
+
+ /* flush any dirty data outstanding on a regular file */
+ if (S_ISREG(vnode->vfs_inode.i_mode)) {
+ filemap_write_and_wait(vnode->vfs_inode.i_mapping);
+ afs_writeback_all(vnode);
+ }
+
+ if (attr->ia_valid & ATTR_FILE) {
+ key = attr->ia_file->private_data;
+ } else {
+ key = afs_request_key(vnode->volume->cell);
+ if (IS_ERR(key)) {
+ ret = PTR_ERR(key);
+ goto error;
+ }
+ }
+
+ ret = afs_vnode_setattr(vnode, key, attr);
+ if (!(attr->ia_valid & ATTR_FILE))
+ key_put(key);
+
+error:
+ _leave(" = %d", ret);
+ return ret;
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff