mirror of
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473ef57ad8
no point reinventing it (with wrong ->read(), BTW). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
878 lines
22 KiB
C
878 lines
22 KiB
C
/*
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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@infradead.org>
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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/fs.h>
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#include <linux/pagemap.h>
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#include <linux/sched.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <linux/iversion.h>
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#include "internal.h"
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#include "afs_fs.h"
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static const struct inode_operations afs_symlink_inode_operations = {
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.get_link = page_get_link,
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.listxattr = afs_listxattr,
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};
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static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode)
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{
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static unsigned long once_only;
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pr_warn("kAFS: AFS vnode with undefined type %u\n",
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vnode->status.type);
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pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n",
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vnode->status.abort_code,
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vnode->status.mode,
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vnode->status.size,
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vnode->status.data_version);
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pr_warn("kAFS: vnode %llx:%llx:%x\n",
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vnode->fid.vid,
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vnode->fid.vnode,
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vnode->fid.unique);
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if (parent_vnode)
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pr_warn("kAFS: dir %llx:%llx:%x\n",
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parent_vnode->fid.vid,
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parent_vnode->fid.vnode,
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parent_vnode->fid.unique);
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if (!test_and_set_bit(0, &once_only))
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dump_stack();
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}
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/*
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* Set the file size and block count. Estimate the number of 512 bytes blocks
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* used, rounded up to nearest 1K for consistency with other AFS clients.
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*/
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static void afs_set_i_size(struct afs_vnode *vnode, u64 size)
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{
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i_size_write(&vnode->vfs_inode, size);
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vnode->vfs_inode.i_blocks = ((size + 1023) >> 10) << 1;
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}
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/*
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* Initialise an inode from the vnode status.
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*/
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static int afs_inode_init_from_status(struct afs_vnode *vnode, struct key *key,
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struct afs_cb_interest *cbi,
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struct afs_vnode *parent_vnode,
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struct afs_status_cb *scb)
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{
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struct afs_cb_interest *old_cbi = NULL;
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struct afs_file_status *status = &scb->status;
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struct inode *inode = AFS_VNODE_TO_I(vnode);
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struct timespec64 t;
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_debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
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status->type,
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status->nlink,
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(unsigned long long) status->size,
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status->data_version,
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status->mode);
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write_seqlock(&vnode->cb_lock);
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vnode->status = *status;
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t = status->mtime_client;
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inode->i_ctime = t;
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inode->i_mtime = t;
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inode->i_atime = t;
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inode->i_uid = make_kuid(&init_user_ns, status->owner);
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inode->i_gid = make_kgid(&init_user_ns, status->group);
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set_nlink(&vnode->vfs_inode, status->nlink);
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switch (status->type) {
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case AFS_FTYPE_FILE:
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inode->i_mode = S_IFREG | status->mode;
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inode->i_op = &afs_file_inode_operations;
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inode->i_fop = &afs_file_operations;
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inode->i_mapping->a_ops = &afs_fs_aops;
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break;
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case AFS_FTYPE_DIR:
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inode->i_mode = S_IFDIR | 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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inode->i_mapping->a_ops = &afs_dir_aops;
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break;
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case AFS_FTYPE_SYMLINK:
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/* Symlinks with a mode of 0644 are actually mountpoints. */
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if ((status->mode & 0777) == 0644) {
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inode->i_flags |= S_AUTOMOUNT;
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set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
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inode->i_mode = S_IFDIR | 0555;
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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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inode->i_mapping->a_ops = &afs_fs_aops;
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} else {
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inode->i_mode = S_IFLNK | status->mode;
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inode->i_op = &afs_symlink_inode_operations;
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inode->i_mapping->a_ops = &afs_fs_aops;
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}
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inode_nohighmem(inode);
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break;
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default:
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dump_vnode(vnode, parent_vnode);
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write_sequnlock(&vnode->cb_lock);
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return afs_protocol_error(NULL, -EBADMSG, afs_eproto_file_type);
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}
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afs_set_i_size(vnode, status->size);
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vnode->invalid_before = status->data_version;
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inode_set_iversion_raw(&vnode->vfs_inode, status->data_version);
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if (!scb->have_cb) {
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/* it's a symlink we just created (the fileserver
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* didn't give us a callback) */
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vnode->cb_expires_at = ktime_get_real_seconds();
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} else {
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vnode->cb_expires_at = scb->callback.expires_at;
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old_cbi = rcu_dereference_protected(vnode->cb_interest,
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lockdep_is_held(&vnode->cb_lock.lock));
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if (cbi != old_cbi)
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rcu_assign_pointer(vnode->cb_interest, afs_get_cb_interest(cbi));
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else
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old_cbi = NULL;
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set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
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}
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write_sequnlock(&vnode->cb_lock);
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afs_put_cb_interest(afs_v2net(vnode), old_cbi);
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return 0;
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}
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/*
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* Update the core inode struct from a returned status record.
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*/
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static void afs_apply_status(struct afs_fs_cursor *fc,
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struct afs_vnode *vnode,
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struct afs_status_cb *scb,
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const afs_dataversion_t *expected_version)
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{
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struct afs_file_status *status = &scb->status;
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struct timespec64 t;
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umode_t mode;
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bool data_changed = false;
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BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags));
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if (status->type != vnode->status.type) {
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pr_warning("Vnode %llx:%llx:%x changed type %u to %u\n",
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vnode->fid.vid,
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vnode->fid.vnode,
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vnode->fid.unique,
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status->type, vnode->status.type);
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afs_protocol_error(NULL, -EBADMSG, afs_eproto_bad_status);
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return;
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}
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if (status->nlink != vnode->status.nlink)
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set_nlink(&vnode->vfs_inode, status->nlink);
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if (status->owner != vnode->status.owner)
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vnode->vfs_inode.i_uid = make_kuid(&init_user_ns, status->owner);
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if (status->group != vnode->status.group)
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vnode->vfs_inode.i_gid = make_kgid(&init_user_ns, status->group);
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if (status->mode != vnode->status.mode) {
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mode = vnode->vfs_inode.i_mode;
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mode &= ~S_IALLUGO;
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mode |= status->mode;
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WRITE_ONCE(vnode->vfs_inode.i_mode, mode);
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}
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t = status->mtime_client;
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vnode->vfs_inode.i_ctime = t;
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vnode->vfs_inode.i_mtime = t;
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vnode->vfs_inode.i_atime = t;
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if (vnode->status.data_version != status->data_version)
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data_changed = true;
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vnode->status = *status;
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if (expected_version &&
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*expected_version != status->data_version) {
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if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags))
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pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s\n",
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vnode->fid.vid, vnode->fid.vnode,
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(unsigned long long)*expected_version,
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(unsigned long long)status->data_version,
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fc->type ? fc->type->name : "???");
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vnode->invalid_before = status->data_version;
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if (vnode->status.type == AFS_FTYPE_DIR) {
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if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
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afs_stat_v(vnode, n_inval);
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} else {
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set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
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}
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} else if (vnode->status.type == AFS_FTYPE_DIR) {
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/* Expected directory change is handled elsewhere so
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* that we can locally edit the directory and save on a
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* download.
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*/
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if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
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data_changed = false;
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}
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if (data_changed) {
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inode_set_iversion_raw(&vnode->vfs_inode, status->data_version);
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afs_set_i_size(vnode, status->size);
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}
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}
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/*
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* Apply a callback to a vnode.
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*/
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static void afs_apply_callback(struct afs_fs_cursor *fc,
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struct afs_vnode *vnode,
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struct afs_status_cb *scb,
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unsigned int cb_break)
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{
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struct afs_cb_interest *old;
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struct afs_callback *cb = &scb->callback;
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if (!afs_cb_is_broken(cb_break, vnode, fc->cbi)) {
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vnode->cb_expires_at = cb->expires_at;
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old = rcu_dereference_protected(vnode->cb_interest,
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lockdep_is_held(&vnode->cb_lock.lock));
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if (old != fc->cbi) {
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rcu_assign_pointer(vnode->cb_interest, afs_get_cb_interest(fc->cbi));
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afs_put_cb_interest(afs_v2net(vnode), old);
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}
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set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
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}
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}
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/*
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* Apply the received status and callback to an inode all in the same critical
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* section to avoid races with afs_validate().
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*/
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void afs_vnode_commit_status(struct afs_fs_cursor *fc,
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struct afs_vnode *vnode,
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unsigned int cb_break,
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const afs_dataversion_t *expected_version,
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struct afs_status_cb *scb)
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{
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if (fc->ac.error != 0)
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return;
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write_seqlock(&vnode->cb_lock);
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if (scb->have_error) {
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if (scb->status.abort_code == VNOVNODE) {
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set_bit(AFS_VNODE_DELETED, &vnode->flags);
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clear_nlink(&vnode->vfs_inode);
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__afs_break_callback(vnode, afs_cb_break_for_deleted);
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}
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} else {
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if (scb->have_status)
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afs_apply_status(fc, vnode, scb, expected_version);
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if (scb->have_cb)
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afs_apply_callback(fc, vnode, scb, cb_break);
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}
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write_sequnlock(&vnode->cb_lock);
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if (fc->ac.error == 0 && scb->have_status)
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afs_cache_permit(vnode, fc->key, cb_break, scb);
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}
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/*
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* Fetch file status from the volume.
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*/
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int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new,
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afs_access_t *_caller_access)
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{
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struct afs_status_cb *scb;
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struct afs_fs_cursor fc;
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int ret;
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_enter("%s,{%llx:%llu.%u,S=%lx}",
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vnode->volume->name,
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vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
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vnode->flags);
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scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL);
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if (!scb)
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return -ENOMEM;
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ret = -ERESTARTSYS;
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if (afs_begin_vnode_operation(&fc, vnode, key, true)) {
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afs_dataversion_t data_version = vnode->status.data_version;
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while (afs_select_fileserver(&fc)) {
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fc.cb_break = afs_calc_vnode_cb_break(vnode);
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afs_fs_fetch_file_status(&fc, scb, NULL);
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}
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if (fc.error) {
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/* Do nothing. */
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} else if (is_new) {
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ret = afs_inode_init_from_status(vnode, key, fc.cbi,
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NULL, scb);
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fc.error = ret;
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if (ret == 0)
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afs_cache_permit(vnode, key, fc.cb_break, scb);
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} else {
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afs_vnode_commit_status(&fc, vnode, fc.cb_break,
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&data_version, scb);
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}
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afs_check_for_remote_deletion(&fc, vnode);
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ret = afs_end_vnode_operation(&fc);
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}
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if (ret == 0 && _caller_access)
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*_caller_access = scb->status.caller_access;
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kfree(scb);
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_leave(" = %d", ret);
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return ret;
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}
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/*
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* iget5() comparator
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*/
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int afs_iget5_test(struct inode *inode, void *opaque)
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{
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struct afs_iget_data *iget_data = opaque;
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struct afs_vnode *vnode = AFS_FS_I(inode);
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return memcmp(&vnode->fid, &iget_data->fid, sizeof(iget_data->fid)) == 0;
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}
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/*
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* iget5() comparator for inode created by autocell operations
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*
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* These pseudo inodes don't match anything.
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*/
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static int afs_iget5_pseudo_dir_test(struct inode *inode, void *opaque)
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{
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return 0;
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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 *iget_data = opaque;
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struct afs_vnode *vnode = AFS_FS_I(inode);
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vnode->fid = iget_data->fid;
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vnode->volume = iget_data->volume;
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vnode->cb_v_break = iget_data->cb_v_break;
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vnode->cb_s_break = iget_data->cb_s_break;
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/* YFS supports 96-bit vnode IDs, but Linux only supports
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* 64-bit inode numbers.
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*/
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inode->i_ino = iget_data->fid.vnode;
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inode->i_generation = iget_data->fid.unique;
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return 0;
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}
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/*
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* Create an inode for a dynamic root directory or an autocell dynamic
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* automount dir.
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*/
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struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root)
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{
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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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static atomic_t afs_autocell_ino;
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struct afs_iget_data iget_data = {
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.cb_v_break = 0,
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.cb_s_break = 0,
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};
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_enter("");
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as = sb->s_fs_info;
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if (as->volume) {
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iget_data.volume = as->volume;
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iget_data.fid.vid = as->volume->vid;
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}
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if (root) {
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iget_data.fid.vnode = 1;
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iget_data.fid.unique = 1;
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} else {
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iget_data.fid.vnode = atomic_inc_return(&afs_autocell_ino);
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iget_data.fid.unique = 0;
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}
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inode = iget5_locked(sb, iget_data.fid.vnode,
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afs_iget5_pseudo_dir_test, afs_iget5_set,
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&iget_data);
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if (!inode) {
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_leave(" = -ENOMEM");
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return ERR_PTR(-ENOMEM);
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}
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_debug("GOT INODE %p { ino=%lu, vl=%llx, vn=%llx, u=%x }",
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inode, inode->i_ino, iget_data.fid.vid, iget_data.fid.vnode,
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iget_data.fid.unique);
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vnode = AFS_FS_I(inode);
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/* there shouldn't be an existing inode */
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BUG_ON(!(inode->i_state & I_NEW));
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inode->i_size = 0;
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inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
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if (root) {
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inode->i_op = &afs_dynroot_inode_operations;
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inode->i_fop = &simple_dir_operations;
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} else {
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inode->i_op = &afs_autocell_inode_operations;
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}
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set_nlink(inode, 2);
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inode->i_uid = GLOBAL_ROOT_UID;
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inode->i_gid = GLOBAL_ROOT_GID;
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inode->i_ctime = inode->i_atime = inode->i_mtime = current_time(inode);
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inode->i_blocks = 0;
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inode_set_iversion_raw(inode, 0);
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inode->i_generation = 0;
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set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
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if (!root) {
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set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
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inode->i_flags |= S_AUTOMOUNT;
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}
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inode->i_flags |= S_NOATIME;
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unlock_new_inode(inode);
|
|
_leave(" = %p", inode);
|
|
return inode;
|
|
}
|
|
|
|
/*
|
|
* Get a cache cookie for an inode.
|
|
*/
|
|
static void afs_get_inode_cache(struct afs_vnode *vnode)
|
|
{
|
|
#ifdef CONFIG_AFS_FSCACHE
|
|
struct {
|
|
u32 vnode_id;
|
|
u32 unique;
|
|
u32 vnode_id_ext[2]; /* Allow for a 96-bit key */
|
|
} __packed key;
|
|
struct afs_vnode_cache_aux aux;
|
|
|
|
if (vnode->status.type == AFS_FTYPE_DIR) {
|
|
vnode->cache = NULL;
|
|
return;
|
|
}
|
|
|
|
key.vnode_id = vnode->fid.vnode;
|
|
key.unique = vnode->fid.unique;
|
|
key.vnode_id_ext[0] = vnode->fid.vnode >> 32;
|
|
key.vnode_id_ext[1] = vnode->fid.vnode_hi;
|
|
aux.data_version = vnode->status.data_version;
|
|
|
|
vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
|
|
&afs_vnode_cache_index_def,
|
|
&key, sizeof(key),
|
|
&aux, sizeof(aux),
|
|
vnode, vnode->status.size, true);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* inode retrieval
|
|
*/
|
|
struct inode *afs_iget(struct super_block *sb, struct key *key,
|
|
struct afs_iget_data *iget_data,
|
|
struct afs_status_cb *scb,
|
|
struct afs_cb_interest *cbi,
|
|
struct afs_vnode *parent_vnode)
|
|
{
|
|
struct afs_super_info *as;
|
|
struct afs_vnode *vnode;
|
|
struct afs_fid *fid = &iget_data->fid;
|
|
struct inode *inode;
|
|
int ret;
|
|
|
|
_enter(",{%llx:%llu.%u},,", fid->vid, fid->vnode, fid->unique);
|
|
|
|
as = sb->s_fs_info;
|
|
iget_data->volume = as->volume;
|
|
|
|
inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
|
|
iget_data);
|
|
if (!inode) {
|
|
_leave(" = -ENOMEM");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
_debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
|
|
inode, fid->vid, fid->vnode, fid->unique);
|
|
|
|
vnode = AFS_FS_I(inode);
|
|
|
|
/* deal with an existing inode */
|
|
if (!(inode->i_state & I_NEW)) {
|
|
_leave(" = %p", inode);
|
|
return inode;
|
|
}
|
|
|
|
if (!scb) {
|
|
/* it's a remotely extant inode */
|
|
ret = afs_fetch_status(vnode, key, true, NULL);
|
|
if (ret < 0)
|
|
goto bad_inode;
|
|
} else {
|
|
ret = afs_inode_init_from_status(vnode, key, cbi, parent_vnode,
|
|
scb);
|
|
if (ret < 0)
|
|
goto bad_inode;
|
|
}
|
|
|
|
afs_get_inode_cache(vnode);
|
|
|
|
/* success */
|
|
clear_bit(AFS_VNODE_UNSET, &vnode->flags);
|
|
inode->i_flags |= S_NOATIME;
|
|
unlock_new_inode(inode);
|
|
_leave(" = %p", inode);
|
|
return inode;
|
|
|
|
/* failure */
|
|
bad_inode:
|
|
iget_failed(inode);
|
|
_leave(" = %d [bad]", ret);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/*
|
|
* 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("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode);
|
|
|
|
#ifdef CONFIG_AFS_FSCACHE
|
|
fscache_invalidate(vnode->cache);
|
|
#endif
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/*
|
|
* Check the validity of a vnode/inode.
|
|
*/
|
|
bool afs_check_validity(struct afs_vnode *vnode)
|
|
{
|
|
struct afs_cb_interest *cbi;
|
|
struct afs_server *server;
|
|
struct afs_volume *volume = vnode->volume;
|
|
enum afs_cb_break_reason need_clear = afs_cb_break_no_break;
|
|
time64_t now = ktime_get_real_seconds();
|
|
bool valid;
|
|
unsigned int cb_break, cb_s_break, cb_v_break;
|
|
int seq = 0;
|
|
|
|
do {
|
|
read_seqbegin_or_lock(&vnode->cb_lock, &seq);
|
|
cb_v_break = READ_ONCE(volume->cb_v_break);
|
|
cb_break = vnode->cb_break;
|
|
|
|
if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
|
|
cbi = rcu_dereference(vnode->cb_interest);
|
|
server = rcu_dereference(cbi->server);
|
|
cb_s_break = READ_ONCE(server->cb_s_break);
|
|
|
|
if (vnode->cb_s_break != cb_s_break ||
|
|
vnode->cb_v_break != cb_v_break) {
|
|
vnode->cb_s_break = cb_s_break;
|
|
vnode->cb_v_break = cb_v_break;
|
|
need_clear = afs_cb_break_for_vsbreak;
|
|
valid = false;
|
|
} else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
|
|
need_clear = afs_cb_break_for_zap;
|
|
valid = false;
|
|
} else if (vnode->cb_expires_at - 10 <= now) {
|
|
need_clear = afs_cb_break_for_lapsed;
|
|
valid = false;
|
|
} else {
|
|
valid = true;
|
|
}
|
|
} else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
|
|
valid = true;
|
|
} else {
|
|
vnode->cb_v_break = cb_v_break;
|
|
valid = false;
|
|
}
|
|
|
|
} while (need_seqretry(&vnode->cb_lock, seq));
|
|
|
|
done_seqretry(&vnode->cb_lock, seq);
|
|
|
|
if (need_clear != afs_cb_break_no_break) {
|
|
write_seqlock(&vnode->cb_lock);
|
|
if (cb_break == vnode->cb_break)
|
|
__afs_break_callback(vnode, need_clear);
|
|
else
|
|
trace_afs_cb_miss(&vnode->fid, need_clear);
|
|
write_sequnlock(&vnode->cb_lock);
|
|
valid = false;
|
|
}
|
|
|
|
return valid;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
bool valid;
|
|
int ret;
|
|
|
|
_enter("{v={%llx:%llu} fl=%lx},%x",
|
|
vnode->fid.vid, vnode->fid.vnode, vnode->flags,
|
|
key_serial(key));
|
|
|
|
rcu_read_lock();
|
|
valid = afs_check_validity(vnode);
|
|
rcu_read_unlock();
|
|
|
|
if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
|
|
clear_nlink(&vnode->vfs_inode);
|
|
|
|
if (valid)
|
|
goto valid;
|
|
|
|
down_write(&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 (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
|
|
_debug("not promised");
|
|
ret = afs_fetch_status(vnode, key, false, NULL);
|
|
if (ret < 0) {
|
|
if (ret == -ENOENT) {
|
|
set_bit(AFS_VNODE_DELETED, &vnode->flags);
|
|
ret = -ESTALE;
|
|
}
|
|
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);
|
|
up_write(&vnode->validate_lock);
|
|
valid:
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
error_unlock:
|
|
up_write(&vnode->validate_lock);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* read the attributes of an inode
|
|
*/
|
|
int afs_getattr(const struct path *path, struct kstat *stat,
|
|
u32 request_mask, unsigned int query_flags)
|
|
{
|
|
struct inode *inode = d_inode(path->dentry);
|
|
struct afs_vnode *vnode = AFS_FS_I(inode);
|
|
int seq = 0;
|
|
|
|
_enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
|
|
|
|
do {
|
|
read_seqbegin_or_lock(&vnode->cb_lock, &seq);
|
|
generic_fillattr(inode, stat);
|
|
} while (need_seqretry(&vnode->cb_lock, seq));
|
|
|
|
done_seqretry(&vnode->cb_lock, seq);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* discard an AFS inode
|
|
*/
|
|
int afs_drop_inode(struct inode *inode)
|
|
{
|
|
_enter("");
|
|
|
|
if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
|
|
return generic_delete_inode(inode);
|
|
else
|
|
return generic_drop_inode(inode);
|
|
}
|
|
|
|
/*
|
|
* clear an AFS inode
|
|
*/
|
|
void afs_evict_inode(struct inode *inode)
|
|
{
|
|
struct afs_cb_interest *cbi;
|
|
struct afs_vnode *vnode;
|
|
|
|
vnode = AFS_FS_I(inode);
|
|
|
|
_enter("{%llx:%llu.%d}",
|
|
vnode->fid.vid,
|
|
vnode->fid.vnode,
|
|
vnode->fid.unique);
|
|
|
|
_debug("CLEAR INODE %p", inode);
|
|
|
|
ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
|
|
|
|
truncate_inode_pages_final(&inode->i_data);
|
|
clear_inode(inode);
|
|
|
|
write_seqlock(&vnode->cb_lock);
|
|
cbi = rcu_dereference_protected(vnode->cb_interest,
|
|
lockdep_is_held(&vnode->cb_lock.lock));
|
|
if (cbi) {
|
|
afs_put_cb_interest(afs_i2net(inode), cbi);
|
|
rcu_assign_pointer(vnode->cb_interest, NULL);
|
|
}
|
|
write_sequnlock(&vnode->cb_lock);
|
|
|
|
while (!list_empty(&vnode->wb_keys)) {
|
|
struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
|
|
struct afs_wb_key, vnode_link);
|
|
list_del(&wbk->vnode_link);
|
|
afs_put_wb_key(wbk);
|
|
}
|
|
|
|
#ifdef CONFIG_AFS_FSCACHE
|
|
{
|
|
struct afs_vnode_cache_aux aux;
|
|
|
|
aux.data_version = vnode->status.data_version;
|
|
fscache_relinquish_cookie(vnode->cache, &aux,
|
|
test_bit(AFS_VNODE_DELETED, &vnode->flags));
|
|
vnode->cache = NULL;
|
|
}
|
|
#endif
|
|
|
|
afs_prune_wb_keys(vnode);
|
|
afs_put_permits(rcu_access_pointer(vnode->permit_cache));
|
|
key_put(vnode->silly_key);
|
|
vnode->silly_key = NULL;
|
|
key_put(vnode->lock_key);
|
|
vnode->lock_key = NULL;
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* set the attributes of an inode
|
|
*/
|
|
int afs_setattr(struct dentry *dentry, struct iattr *attr)
|
|
{
|
|
struct afs_fs_cursor fc;
|
|
struct afs_status_cb *scb;
|
|
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
|
|
struct key *key;
|
|
int ret = -ENOMEM;
|
|
|
|
_enter("{%llx:%llu},{n=%pd},%x",
|
|
vnode->fid.vid, vnode->fid.vnode, dentry,
|
|
attr->ia_valid);
|
|
|
|
if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
|
|
ATTR_MTIME))) {
|
|
_leave(" = 0 [unsupported]");
|
|
return 0;
|
|
}
|
|
|
|
scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL);
|
|
if (!scb)
|
|
goto error;
|
|
|
|
/* 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);
|
|
|
|
if (attr->ia_valid & ATTR_FILE) {
|
|
key = afs_file_key(attr->ia_file);
|
|
} else {
|
|
key = afs_request_key(vnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error_scb;
|
|
}
|
|
}
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, vnode, key, false)) {
|
|
afs_dataversion_t data_version = vnode->status.data_version;
|
|
|
|
if (attr->ia_valid & ATTR_SIZE)
|
|
data_version++;
|
|
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = afs_calc_vnode_cb_break(vnode);
|
|
afs_fs_setattr(&fc, attr, scb);
|
|
}
|
|
|
|
afs_check_for_remote_deletion(&fc, vnode);
|
|
afs_vnode_commit_status(&fc, vnode, fc.cb_break,
|
|
&data_version, scb);
|
|
ret = afs_end_vnode_operation(&fc);
|
|
}
|
|
|
|
if (!(attr->ia_valid & ATTR_FILE))
|
|
key_put(key);
|
|
|
|
error_scb:
|
|
kfree(scb);
|
|
error:
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|