/*
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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"
|
|
static const struct inode_operations afs_symlink_inode_operations = {
|
.get_link = page_get_link,
|
};
|
|
static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode)
|
{
|
static unsigned long once_only;
|
|
pr_warn("kAFS: AFS vnode with undefined type %u\n", vnode->status.type);
|
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,
|
vnode->status.size,
|
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,
|
vnode->fid.unique);
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if (parent_vnode)
|
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);
|
|
if (!test_and_set_bit(0, &once_only))
|
dump_stack();
|
}
|
|
/*
|
* Initialise an inode from the vnode status.
|
*/
|
static int afs_inode_init_from_status(struct afs_operation *op,
|
struct afs_vnode_param *vp,
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struct afs_vnode *vnode)
|
{
|
struct afs_file_status *status = &vp->scb.status;
|
struct inode *inode = AFS_VNODE_TO_I(vnode);
|
struct timespec64 t;
|
|
_enter("{%llx:%llu.%u} %s",
|
vp->fid.vid, vp->fid.vnode, vp->fid.unique,
|
op->type ? op->type->name : "???");
|
|
_debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
|
status->type,
|
status->nlink,
|
(unsigned long long) status->size,
|
status->data_version,
|
status->mode);
|
|
write_seqlock(&vnode->cb_lock);
|
|
vnode->cb_v_break = op->cb_v_break;
|
vnode->cb_s_break = op->cb_s_break;
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vnode->status = *status;
|
|
t = status->mtime_client;
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inode->i_ctime = t;
|
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);
|
|
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;
|
case AFS_FTYPE_DIR:
|
inode->i_mode = S_IFDIR | (status->mode & S_IALLUGO);
|
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;
|
break;
|
case AFS_FTYPE_SYMLINK:
|
/* Symlinks with a mode of 0644 are actually mountpoints. */
|
if ((status->mode & 0777) == 0644) {
|
inode->i_flags |= S_AUTOMOUNT;
|
|
set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
|
|
inode->i_mode = S_IFDIR | 0555;
|
inode->i_op = &afs_mntpt_inode_operations;
|
inode->i_fop = &afs_mntpt_file_operations;
|
inode->i_mapping->a_ops = &afs_fs_aops;
|
} else {
|
inode->i_mode = S_IFLNK | status->mode;
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inode->i_op = &afs_symlink_inode_operations;
|
inode->i_mapping->a_ops = &afs_fs_aops;
|
}
|
inode_nohighmem(inode);
|
break;
|
default:
|
dump_vnode(vnode, op->file[0].vnode != vnode ? op->file[0].vnode : NULL);
|
write_sequnlock(&vnode->cb_lock);
|
return afs_protocol_error(NULL, afs_eproto_file_type);
|
}
|
|
afs_set_i_size(vnode, status->size);
|
|
vnode->invalid_before = status->data_version;
|
inode_set_iversion_raw(&vnode->vfs_inode, status->data_version);
|
|
if (!vp->scb.have_cb) {
|
/* it's a symlink we just created (the fileserver
|
* didn't give us a callback) */
|
vnode->cb_expires_at = ktime_get_real_seconds();
|
} else {
|
vnode->cb_expires_at = vp->scb.callback.expires_at;
|
vnode->cb_server = op->server;
|
set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
|
}
|
|
write_sequnlock(&vnode->cb_lock);
|
return 0;
|
}
|
|
/*
|
* Update the core inode struct from a returned status record.
|
*/
|
static void afs_apply_status(struct afs_operation *op,
|
struct afs_vnode_param *vp)
|
{
|
struct afs_file_status *status = &vp->scb.status;
|
struct afs_vnode *vnode = vp->vnode;
|
struct inode *inode = &vnode->vfs_inode;
|
struct timespec64 t;
|
umode_t mode;
|
bool data_changed = false;
|
bool change_size = vp->set_size;
|
|
_enter("{%llx:%llu.%u} %s",
|
vp->fid.vid, vp->fid.vnode, vp->fid.unique,
|
op->type ? op->type->name : "???");
|
|
BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags));
|
|
if (status->type != vnode->status.type) {
|
pr_warn("Vnode %llx:%llx:%x changed type %u to %u\n",
|
vnode->fid.vid,
|
vnode->fid.vnode,
|
vnode->fid.unique,
|
status->type, vnode->status.type);
|
afs_protocol_error(NULL, afs_eproto_bad_status);
|
return;
|
}
|
|
if (status->nlink != vnode->status.nlink)
|
set_nlink(inode, status->nlink);
|
|
if (status->owner != vnode->status.owner)
|
inode->i_uid = make_kuid(&init_user_ns, status->owner);
|
|
if (status->group != vnode->status.group)
|
inode->i_gid = make_kgid(&init_user_ns, status->group);
|
|
if (status->mode != vnode->status.mode) {
|
mode = inode->i_mode;
|
mode &= ~S_IALLUGO;
|
mode |= status->mode & S_IALLUGO;
|
WRITE_ONCE(inode->i_mode, mode);
|
}
|
|
t = status->mtime_client;
|
inode->i_mtime = t;
|
if (vp->update_ctime)
|
inode->i_ctime = op->ctime;
|
|
if (vnode->status.data_version != status->data_version)
|
data_changed = true;
|
|
vnode->status = *status;
|
|
if (vp->dv_before + vp->dv_delta != status->data_version) {
|
if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags))
|
pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s\n",
|
vnode->fid.vid, vnode->fid.vnode,
|
(unsigned long long)vp->dv_before + vp->dv_delta,
|
(unsigned long long)status->data_version,
|
op->type ? op->type->name : "???");
|
|
vnode->invalid_before = status->data_version;
|
if (vnode->status.type == AFS_FTYPE_DIR) {
|
if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
|
afs_stat_v(vnode, n_inval);
|
} else {
|
set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
|
}
|
change_size = true;
|
} else if (vnode->status.type == AFS_FTYPE_DIR) {
|
/* Expected directory change is handled elsewhere so
|
* that we can locally edit the directory and save on a
|
* download.
|
*/
|
if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
|
data_changed = false;
|
change_size = true;
|
}
|
|
if (data_changed) {
|
inode_set_iversion_raw(inode, status->data_version);
|
|
/* Only update the size if the data version jumped. If the
|
* file is being modified locally, then we might have our own
|
* idea of what the size should be that's not the same as
|
* what's on the server.
|
*/
|
if (change_size) {
|
afs_set_i_size(vnode, status->size);
|
inode->i_ctime = t;
|
inode->i_atime = t;
|
}
|
}
|
}
|
|
/*
|
* Apply a callback to a vnode.
|
*/
|
static void afs_apply_callback(struct afs_operation *op,
|
struct afs_vnode_param *vp)
|
{
|
struct afs_callback *cb = &vp->scb.callback;
|
struct afs_vnode *vnode = vp->vnode;
|
|
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;
|
set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
|
}
|
}
|
|
/*
|
* Apply the received status and callback to an inode all in the same critical
|
* section to avoid races with afs_validate().
|
*/
|
void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *vp)
|
{
|
struct afs_vnode *vnode = vp->vnode;
|
|
_enter("");
|
|
write_seqlock(&vnode->cb_lock);
|
|
if (vp->scb.have_error) {
|
/* A YFS server will return this from RemoveFile2 and AFS and
|
* YFS will return this from InlineBulkStatus.
|
*/
|
if (vp->scb.status.abort_code == VNOVNODE) {
|
set_bit(AFS_VNODE_DELETED, &vnode->flags);
|
clear_nlink(&vnode->vfs_inode);
|
__afs_break_callback(vnode, afs_cb_break_for_deleted);
|
op->flags &= ~AFS_OPERATION_DIR_CONFLICT;
|
}
|
} else if (vp->scb.have_status) {
|
if (vp->speculative &&
|
(test_bit(AFS_VNODE_MODIFYING, &vnode->flags) ||
|
vp->dv_before != vnode->status.data_version))
|
/* Ignore the result of a speculative bulk status fetch
|
* if it splits around a modification op, thereby
|
* appearing to regress the data version.
|
*/
|
goto out;
|
afs_apply_status(op, vp);
|
if (vp->scb.have_cb)
|
afs_apply_callback(op, vp);
|
} else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) {
|
drop_nlink(&vnode->vfs_inode);
|
if (vnode->vfs_inode.i_nlink == 0) {
|
set_bit(AFS_VNODE_DELETED, &vnode->flags);
|
__afs_break_callback(vnode, afs_cb_break_for_deleted);
|
}
|
}
|
|
out:
|
write_sequnlock(&vnode->cb_lock);
|
|
if (vp->scb.have_status)
|
afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
|
}
|
|
static void afs_fetch_status_success(struct afs_operation *op)
|
{
|
struct afs_vnode_param *vp = &op->file[op->fetch_status.which];
|
struct afs_vnode *vnode = vp->vnode;
|
int ret;
|
|
if (vnode->vfs_inode.i_state & I_NEW) {
|
ret = afs_inode_init_from_status(op, vp, vnode);
|
op->error = ret;
|
if (ret == 0)
|
afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
|
} else {
|
afs_vnode_commit_status(op, vp);
|
}
|
}
|
|
const struct afs_operation_ops afs_fetch_status_operation = {
|
.issue_afs_rpc = afs_fs_fetch_status,
|
.issue_yfs_rpc = yfs_fs_fetch_status,
|
.success = afs_fetch_status_success,
|
.aborted = afs_check_for_remote_deletion,
|
};
|
|
/*
|
* Fetch file status from the volume.
|
*/
|
int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new,
|
afs_access_t *_caller_access)
|
{
|
struct afs_operation *op;
|
|
_enter("%s,{%llx:%llu.%u,S=%lx}",
|
vnode->volume->name,
|
vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
|
vnode->flags);
|
|
op = afs_alloc_operation(key, vnode->volume);
|
if (IS_ERR(op))
|
return PTR_ERR(op);
|
|
afs_op_set_vnode(op, 0, vnode);
|
|
op->nr_files = 1;
|
op->ops = &afs_fetch_status_operation;
|
afs_begin_vnode_operation(op);
|
afs_wait_for_operation(op);
|
|
if (_caller_access)
|
*_caller_access = op->file[0].scb.status.caller_access;
|
return afs_put_operation(op);
|
}
|
|
/*
|
* ilookup() comparator
|
*/
|
int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque)
|
{
|
struct afs_vnode *vnode = AFS_FS_I(inode);
|
struct afs_fid *fid = opaque;
|
|
return (fid->vnode == vnode->fid.vnode &&
|
fid->vnode_hi == vnode->fid.vnode_hi &&
|
fid->unique == vnode->fid.unique);
|
}
|
|
/*
|
* iget5() comparator
|
*/
|
static int afs_iget5_test(struct inode *inode, void *opaque)
|
{
|
struct afs_vnode_param *vp = opaque;
|
//struct afs_vnode *vnode = AFS_FS_I(inode);
|
|
return afs_ilookup5_test_by_fid(inode, &vp->fid);
|
}
|
|
/*
|
* iget5() inode initialiser
|
*/
|
static int afs_iget5_set(struct inode *inode, void *opaque)
|
{
|
struct afs_vnode_param *vp = opaque;
|
struct afs_super_info *as = AFS_FS_S(inode->i_sb);
|
struct afs_vnode *vnode = AFS_FS_I(inode);
|
|
vnode->volume = as->volume;
|
vnode->fid = vp->fid;
|
|
/* YFS supports 96-bit vnode IDs, but Linux only supports
|
* 64-bit inode numbers.
|
*/
|
inode->i_ino = vnode->fid.vnode;
|
inode->i_generation = vnode->fid.unique;
|
return 0;
|
}
|
|
/*
|
* 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 afs_operation *op, struct afs_vnode_param *vp)
|
{
|
struct afs_vnode_param *dvp = &op->file[0];
|
struct super_block *sb = dvp->vnode->vfs_inode.i_sb;
|
struct afs_vnode *vnode;
|
struct inode *inode;
|
int ret;
|
|
_enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique);
|
|
inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp);
|
if (!inode) {
|
_leave(" = -ENOMEM");
|
return ERR_PTR(-ENOMEM);
|
}
|
|
vnode = AFS_FS_I(inode);
|
|
_debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
|
inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
|
|
/* deal with an existing inode */
|
if (!(inode->i_state & I_NEW)) {
|
_leave(" = %p", inode);
|
return inode;
|
}
|
|
ret = afs_inode_init_from_status(op, vp, vnode);
|
if (ret < 0)
|
goto bad_inode;
|
|
afs_get_inode_cache(vnode);
|
|
/* success */
|
clear_bit(AFS_VNODE_UNSET, &vnode->flags);
|
unlock_new_inode(inode);
|
_leave(" = %p", inode);
|
return inode;
|
|
/* failure */
|
bad_inode:
|
iget_failed(inode);
|
_leave(" = %d [bad]", ret);
|
return ERR_PTR(ret);
|
}
|
|
static int afs_iget5_set_root(struct inode *inode, void *opaque)
|
{
|
struct afs_super_info *as = AFS_FS_S(inode->i_sb);
|
struct afs_vnode *vnode = AFS_FS_I(inode);
|
|
vnode->volume = as->volume;
|
vnode->fid.vid = as->volume->vid,
|
vnode->fid.vnode = 1;
|
vnode->fid.unique = 1;
|
inode->i_ino = 1;
|
inode->i_generation = 1;
|
return 0;
|
}
|
|
/*
|
* Set up the root inode for a volume. This is always vnode 1, unique 1 within
|
* the volume.
|
*/
|
struct inode *afs_root_iget(struct super_block *sb, struct key *key)
|
{
|
struct afs_super_info *as = AFS_FS_S(sb);
|
struct afs_operation *op;
|
struct afs_vnode *vnode;
|
struct inode *inode;
|
int ret;
|
|
_enter(",{%llx},,", as->volume->vid);
|
|
inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL);
|
if (!inode) {
|
_leave(" = -ENOMEM");
|
return ERR_PTR(-ENOMEM);
|
}
|
|
_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);
|
}
|
|
/*
|
* Get the server reinit counter for a vnode's current server.
|
*/
|
static bool afs_get_s_break_rcu(struct afs_vnode *vnode, unsigned int *_s_break)
|
{
|
struct afs_server_list *slist = rcu_dereference(vnode->volume->servers);
|
struct afs_server *server;
|
int i;
|
|
for (i = 0; i < slist->nr_servers; i++) {
|
server = slist->servers[i].server;
|
if (server == vnode->cb_server) {
|
*_s_break = READ_ONCE(server->cb_s_break);
|
return true;
|
}
|
}
|
|
return false;
|
}
|
|
/*
|
* Check the validity of a vnode/inode.
|
*/
|
bool afs_check_validity(struct afs_vnode *vnode)
|
{
|
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) &&
|
afs_get_s_break_rcu(vnode, &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);
|
struct key *key;
|
int ret, seq = 0;
|
|
_enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
|
|
if (vnode->volume &&
|
!(query_flags & AT_STATX_DONT_SYNC) &&
|
!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
|
key = afs_request_key(vnode->volume->cell);
|
if (IS_ERR(key))
|
return PTR_ERR(key);
|
ret = afs_validate(vnode, key);
|
key_put(key);
|
if (ret < 0)
|
return ret;
|
}
|
|
do {
|
read_seqbegin_or_lock(&vnode->cb_lock, &seq);
|
generic_fillattr(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 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;
|
}
|
