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912 lines
23 KiB
912 lines
23 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 <[email protected]> |
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* David Howells <[email protected]> |
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* |
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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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|
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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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}; |
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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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|
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pr_warn("kAFS: AFS vnode with undefined type %u\n", 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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|
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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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/* |
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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_operation *op, |
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struct afs_vnode_param *vp, |
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struct afs_vnode *vnode) |
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{ |
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struct afs_file_status *status = &vp->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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_enter("{%llx:%llu.%u} %s", |
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vp->fid.vid, vp->fid.vnode, vp->fid.unique, |
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op->type ? op->type->name : "???"); |
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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->cb_v_break = op->cb_v_break; |
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vnode->cb_s_break = op->cb_s_break; |
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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_flags |= S_NOATIME; |
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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 & S_IALLUGO); |
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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 & S_IALLUGO); |
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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, op->file[0].vnode != vnode ? op->file[0].vnode : NULL); |
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write_sequnlock(&vnode->cb_lock); |
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return afs_protocol_error(NULL, 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 (!vp->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 = vp->scb.callback.expires_at; |
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vnode->cb_server = op->server; |
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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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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_operation *op, |
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struct afs_vnode_param *vp) |
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{ |
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struct afs_file_status *status = &vp->scb.status; |
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struct afs_vnode *vnode = vp->vnode; |
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struct inode *inode = &vnode->vfs_inode; |
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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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bool change_size = vp->set_size; |
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_enter("{%llx:%llu.%u} %s", |
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vp->fid.vid, vp->fid.vnode, vp->fid.unique, |
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op->type ? op->type->name : "???"); |
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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_warn("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, 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(inode, status->nlink); |
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if (status->owner != vnode->status.owner) |
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inode->i_uid = make_kuid(&init_user_ns, status->owner); |
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if (status->group != vnode->status.group) |
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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 = inode->i_mode; |
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mode &= ~S_IALLUGO; |
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mode |= status->mode & S_IALLUGO; |
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WRITE_ONCE(inode->i_mode, mode); |
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} |
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t = status->mtime_client; |
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inode->i_mtime = t; |
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if (vp->update_ctime) |
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inode->i_ctime = op->ctime; |
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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 (vp->dv_before + vp->dv_delta != 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 (op=%x)\n", |
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vnode->fid.vid, vnode->fid.vnode, |
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(unsigned long long)vp->dv_before + vp->dv_delta, |
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(unsigned long long)status->data_version, |
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op->type ? op->type->name : "???", |
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op->debug_id); |
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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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change_size = true; |
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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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change_size = true; |
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} |
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if (data_changed) { |
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inode_set_iversion_raw(inode, status->data_version); |
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/* Only update the size if the data version jumped. If the |
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* file is being modified locally, then we might have our own |
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* idea of what the size should be that's not the same as |
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* what's on the server. |
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*/ |
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if (change_size) { |
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afs_set_i_size(vnode, status->size); |
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inode->i_ctime = t; |
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inode->i_atime = t; |
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} |
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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_operation *op, |
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struct afs_vnode_param *vp) |
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{ |
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struct afs_callback *cb = &vp->scb.callback; |
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struct afs_vnode *vnode = vp->vnode; |
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if (!afs_cb_is_broken(vp->cb_break_before, vnode)) { |
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vnode->cb_expires_at = cb->expires_at; |
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vnode->cb_server = op->server; |
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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_operation *op, struct afs_vnode_param *vp) |
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{ |
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struct afs_vnode *vnode = vp->vnode; |
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_enter(""); |
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write_seqlock(&vnode->cb_lock); |
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if (vp->scb.have_error) { |
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/* A YFS server will return this from RemoveFile2 and AFS and |
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* YFS will return this from InlineBulkStatus. |
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*/ |
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if (vp->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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op->flags &= ~AFS_OPERATION_DIR_CONFLICT; |
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} |
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} else if (vp->scb.have_status) { |
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if (vp->speculative && |
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(test_bit(AFS_VNODE_MODIFYING, &vnode->flags) || |
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vp->dv_before != vnode->status.data_version)) |
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/* Ignore the result of a speculative bulk status fetch |
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* if it splits around a modification op, thereby |
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* appearing to regress the data version. |
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*/ |
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goto out; |
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afs_apply_status(op, vp); |
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if (vp->scb.have_cb) |
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afs_apply_callback(op, vp); |
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} else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) { |
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drop_nlink(&vnode->vfs_inode); |
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if (vnode->vfs_inode.i_nlink == 0) { |
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set_bit(AFS_VNODE_DELETED, &vnode->flags); |
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__afs_break_callback(vnode, afs_cb_break_for_deleted); |
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} |
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} |
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out: |
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write_sequnlock(&vnode->cb_lock); |
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|
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if (vp->scb.have_status) |
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afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb); |
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} |
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static void afs_fetch_status_success(struct afs_operation *op) |
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{ |
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struct afs_vnode_param *vp = &op->file[op->fetch_status.which]; |
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struct afs_vnode *vnode = vp->vnode; |
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int ret; |
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|
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if (vnode->vfs_inode.i_state & I_NEW) { |
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ret = afs_inode_init_from_status(op, vp, vnode); |
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op->error = ret; |
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if (ret == 0) |
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afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb); |
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} else { |
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afs_vnode_commit_status(op, vp); |
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} |
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} |
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const struct afs_operation_ops afs_fetch_status_operation = { |
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.issue_afs_rpc = afs_fs_fetch_status, |
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.issue_yfs_rpc = yfs_fs_fetch_status, |
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.success = afs_fetch_status_success, |
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.aborted = afs_check_for_remote_deletion, |
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}; |
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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_operation *op; |
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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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|
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op = afs_alloc_operation(key, vnode->volume); |
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if (IS_ERR(op)) |
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return PTR_ERR(op); |
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afs_op_set_vnode(op, 0, vnode); |
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op->nr_files = 1; |
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op->ops = &afs_fetch_status_operation; |
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afs_begin_vnode_operation(op); |
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afs_wait_for_operation(op); |
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|
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if (_caller_access) |
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*_caller_access = op->file[0].scb.status.caller_access; |
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return afs_put_operation(op); |
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} |
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|
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/* |
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* ilookup() comparator |
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*/ |
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int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque) |
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{ |
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struct afs_vnode *vnode = AFS_FS_I(inode); |
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struct afs_fid *fid = opaque; |
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|
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return (fid->vnode == vnode->fid.vnode && |
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fid->vnode_hi == vnode->fid.vnode_hi && |
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fid->unique == vnode->fid.unique); |
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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_vnode_param *vp = opaque; |
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//struct afs_vnode *vnode = AFS_FS_I(inode); |
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return afs_ilookup5_test_by_fid(inode, &vp->fid); |
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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_vnode_param *vp = opaque; |
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struct afs_super_info *as = AFS_FS_S(inode->i_sb); |
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struct afs_vnode *vnode = AFS_FS_I(inode); |
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vnode->volume = as->volume; |
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vnode->fid = vp->fid; |
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|
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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 = vnode->fid.vnode; |
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inode->i_generation = vnode->fid.unique; |
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return 0; |
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} |
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|
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/* |
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* Get a cache cookie for an inode. |
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*/ |
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static void afs_get_inode_cache(struct afs_vnode *vnode) |
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{ |
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#ifdef CONFIG_AFS_FSCACHE |
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struct { |
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u32 vnode_id; |
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u32 unique; |
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u32 vnode_id_ext[2]; /* Allow for a 96-bit key */ |
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} __packed key; |
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struct afs_vnode_cache_aux aux; |
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|
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if (vnode->status.type != AFS_FTYPE_FILE) { |
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vnode->cache = NULL; |
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return; |
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} |
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|
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key.vnode_id = vnode->fid.vnode; |
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key.unique = vnode->fid.unique; |
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key.vnode_id_ext[0] = vnode->fid.vnode >> 32; |
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key.vnode_id_ext[1] = vnode->fid.vnode_hi; |
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aux.data_version = vnode->status.data_version; |
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vnode->cache = fscache_acquire_cookie(vnode->volume->cache, |
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&afs_vnode_cache_index_def, |
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&key, sizeof(key), |
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&aux, sizeof(aux), |
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vnode, vnode->status.size, true); |
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#endif |
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} |
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|
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/* |
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* inode retrieval |
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*/ |
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struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp) |
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{ |
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struct afs_vnode_param *dvp = &op->file[0]; |
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struct super_block *sb = dvp->vnode->vfs_inode.i_sb; |
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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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|
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_enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique); |
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|
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inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp); |
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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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vnode = AFS_FS_I(inode); |
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|
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_debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }", |
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inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); |
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|
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/* deal with an existing inode */ |
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if (!(inode->i_state & I_NEW)) { |
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_leave(" = %p", inode); |
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return inode; |
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} |
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|
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ret = afs_inode_init_from_status(op, vp, vnode); |
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if (ret < 0) |
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goto bad_inode; |
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|
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afs_get_inode_cache(vnode); |
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|
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/* success */ |
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clear_bit(AFS_VNODE_UNSET, &vnode->flags); |
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unlock_new_inode(inode); |
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_leave(" = %p", inode); |
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return inode; |
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|
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/* failure */ |
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bad_inode: |
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iget_failed(inode); |
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_leave(" = %d [bad]", ret); |
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return ERR_PTR(ret); |
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} |
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|
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static int afs_iget5_set_root(struct inode *inode, void *opaque) |
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{ |
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struct afs_super_info *as = AFS_FS_S(inode->i_sb); |
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struct afs_vnode *vnode = AFS_FS_I(inode); |
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|
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vnode->volume = as->volume; |
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vnode->fid.vid = as->volume->vid, |
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vnode->fid.vnode = 1; |
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vnode->fid.unique = 1; |
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inode->i_ino = 1; |
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inode->i_generation = 1; |
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return 0; |
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} |
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|
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/* |
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* Set up the root inode for a volume. This is always vnode 1, unique 1 within |
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* the volume. |
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*/ |
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struct inode *afs_root_iget(struct super_block *sb, struct key *key) |
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{ |
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struct afs_super_info *as = AFS_FS_S(sb); |
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struct afs_operation *op; |
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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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|
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_enter(",{%llx},,", as->volume->vid); |
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|
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inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL); |
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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 ROOT INODE %p { vl=%llx }", inode, as->volume->vid); |
|
|
|
BUG_ON(!(inode->i_state & I_NEW)); |
|
|
|
vnode = AFS_FS_I(inode); |
|
vnode->cb_v_break = as->volume->cb_v_break, |
|
|
|
op = afs_alloc_operation(key, as->volume); |
|
if (IS_ERR(op)) { |
|
ret = PTR_ERR(op); |
|
goto error; |
|
} |
|
|
|
afs_op_set_vnode(op, 0, vnode); |
|
|
|
op->nr_files = 1; |
|
op->ops = &afs_fetch_status_operation; |
|
ret = afs_do_sync_operation(op); |
|
if (ret < 0) |
|
goto error; |
|
|
|
afs_get_inode_cache(vnode); |
|
|
|
clear_bit(AFS_VNODE_UNSET, &vnode->flags); |
|
unlock_new_inode(inode); |
|
_leave(" = %p", inode); |
|
return inode; |
|
|
|
error: |
|
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 |
|
*/ |
|
static 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 to see if we have a server currently serving this volume and that it |
|
* hasn't been reinitialised or dropped from the list. |
|
*/ |
|
static bool afs_check_server_good(struct afs_vnode *vnode) |
|
{ |
|
struct afs_server_list *slist; |
|
struct afs_server *server; |
|
bool good; |
|
int i; |
|
|
|
if (vnode->cb_fs_s_break == atomic_read(&vnode->volume->cell->fs_s_break)) |
|
return true; |
|
|
|
rcu_read_lock(); |
|
|
|
slist = rcu_dereference(vnode->volume->servers); |
|
for (i = 0; i < slist->nr_servers; i++) { |
|
server = slist->servers[i].server; |
|
if (server == vnode->cb_server) { |
|
good = (vnode->cb_s_break == server->cb_s_break); |
|
rcu_read_unlock(); |
|
return good; |
|
} |
|
} |
|
|
|
rcu_read_unlock(); |
|
return false; |
|
} |
|
|
|
/* |
|
* Check the validity of a vnode/inode. |
|
*/ |
|
bool afs_check_validity(struct afs_vnode *vnode) |
|
{ |
|
enum afs_cb_break_reason need_clear = afs_cb_break_no_break; |
|
time64_t now = ktime_get_real_seconds(); |
|
unsigned int cb_break; |
|
int seq = 0; |
|
|
|
do { |
|
read_seqbegin_or_lock(&vnode->cb_lock, &seq); |
|
cb_break = vnode->cb_break; |
|
|
|
if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { |
|
if (vnode->cb_v_break != vnode->volume->cb_v_break) |
|
need_clear = afs_cb_break_for_v_break; |
|
else if (!afs_check_server_good(vnode)) |
|
need_clear = afs_cb_break_for_s_reinit; |
|
else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) |
|
need_clear = afs_cb_break_for_zap; |
|
else if (vnode->cb_expires_at - 10 <= now) |
|
need_clear = afs_cb_break_for_lapsed; |
|
} else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { |
|
; |
|
} else { |
|
need_clear = afs_cb_break_no_promise; |
|
} |
|
|
|
} while (need_seqretry(&vnode->cb_lock, seq)); |
|
|
|
done_seqretry(&vnode->cb_lock, seq); |
|
|
|
if (need_clear == afs_cb_break_no_break) |
|
return true; |
|
|
|
write_seqlock(&vnode->cb_lock); |
|
if (need_clear == afs_cb_break_no_promise) |
|
vnode->cb_v_break = vnode->volume->cb_v_break; |
|
else 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); |
|
return false; |
|
} |
|
|
|
/* |
|
* 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={%llx:%llu} fl=%lx},%x", |
|
vnode->fid.vid, vnode->fid.vnode, vnode->flags, |
|
key_serial(key)); |
|
|
|
if (unlikely(test_bit(AFS_VNODE_DELETED, &vnode->flags))) { |
|
if (vnode->vfs_inode.i_nlink) |
|
clear_nlink(&vnode->vfs_inode); |
|
goto valid; |
|
} |
|
|
|
if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) && |
|
afs_check_validity(vnode)) |
|
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(struct user_namespace *mnt_userns, 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(&init_user_ns, inode, stat); |
|
if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) && |
|
stat->nlink > 0) |
|
stat->nlink -= 1; |
|
} 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_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); |
|
|
|
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(""); |
|
} |
|
|
|
static void afs_setattr_success(struct afs_operation *op) |
|
{ |
|
struct afs_vnode_param *vp = &op->file[0]; |
|
struct inode *inode = &vp->vnode->vfs_inode; |
|
loff_t old_i_size = i_size_read(inode); |
|
|
|
op->setattr.old_i_size = old_i_size; |
|
afs_vnode_commit_status(op, vp); |
|
/* inode->i_size has now been changed. */ |
|
|
|
if (op->setattr.attr->ia_valid & ATTR_SIZE) { |
|
loff_t size = op->setattr.attr->ia_size; |
|
if (size > old_i_size) |
|
pagecache_isize_extended(inode, old_i_size, size); |
|
} |
|
} |
|
|
|
static void afs_setattr_edit_file(struct afs_operation *op) |
|
{ |
|
struct afs_vnode_param *vp = &op->file[0]; |
|
struct inode *inode = &vp->vnode->vfs_inode; |
|
|
|
if (op->setattr.attr->ia_valid & ATTR_SIZE) { |
|
loff_t size = op->setattr.attr->ia_size; |
|
loff_t i_size = op->setattr.old_i_size; |
|
|
|
if (size < i_size) |
|
truncate_pagecache(inode, size); |
|
} |
|
} |
|
|
|
static const struct afs_operation_ops afs_setattr_operation = { |
|
.issue_afs_rpc = afs_fs_setattr, |
|
.issue_yfs_rpc = yfs_fs_setattr, |
|
.success = afs_setattr_success, |
|
.edit_dir = afs_setattr_edit_file, |
|
}; |
|
|
|
/* |
|
* set the attributes of an inode |
|
*/ |
|
int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, |
|
struct iattr *attr) |
|
{ |
|
struct afs_operation *op; |
|
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); |
|
int ret; |
|
|
|
_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 | ATTR_MTIME_SET | ATTR_TIMES_SET | |
|
ATTR_TOUCH))) { |
|
_leave(" = 0 [unsupported]"); |
|
return 0; |
|
} |
|
|
|
if (attr->ia_valid & ATTR_SIZE) { |
|
if (!S_ISREG(vnode->vfs_inode.i_mode)) |
|
return -EISDIR; |
|
|
|
ret = inode_newsize_ok(&vnode->vfs_inode, attr->ia_size); |
|
if (ret) |
|
return ret; |
|
|
|
if (attr->ia_size == i_size_read(&vnode->vfs_inode)) |
|
attr->ia_valid &= ~ATTR_SIZE; |
|
} |
|
|
|
/* 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); |
|
|
|
/* Prevent any new writebacks from starting whilst we do this. */ |
|
down_write(&vnode->validate_lock); |
|
|
|
op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ? |
|
afs_file_key(attr->ia_file) : NULL), |
|
vnode->volume); |
|
if (IS_ERR(op)) { |
|
ret = PTR_ERR(op); |
|
goto out_unlock; |
|
} |
|
|
|
afs_op_set_vnode(op, 0, vnode); |
|
op->setattr.attr = attr; |
|
|
|
if (attr->ia_valid & ATTR_SIZE) { |
|
op->file[0].dv_delta = 1; |
|
op->file[0].set_size = true; |
|
} |
|
op->ctime = attr->ia_ctime; |
|
op->file[0].update_ctime = 1; |
|
op->file[0].modification = true; |
|
|
|
op->ops = &afs_setattr_operation; |
|
ret = afs_do_sync_operation(op); |
|
|
|
out_unlock: |
|
up_write(&vnode->validate_lock); |
|
_leave(" = %d", ret); |
|
return ret; |
|
}
|
|
|