linux/fs/afs/inode.c
David Howells 0770bd4187 afs: Skip truncation on the server of data we haven't written yet
Don't send a truncation RPC to the server if we're only shortening data
that's in the pagecache and is beyond the server's EOF.

Also don't automatically force writeback on setattr, but do wait to store
RPCs that are in the region to be removed on a shortening truncation.

Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: kafs-testing@auristor.com
Acked-by: Jeff Layton <jlayton@kernel.org>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Link: https://lore.kernel.org/r/163819663275.215744.4781075713714590913.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906972600.143852.14237659724463048094.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967177522.1823006.15336589054269480601.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021571880.640689.1837025861707111004.stgit@warthog.procyon.org.uk/ # v4
2022-01-07 13:44:56 +00:00

940 lines
24 KiB
C

/*
* Copyright (c) 2002 Red Hat, Inc. All rights reserved.
*
* This software may be freely redistributed under the terms of the
* GNU General Public License.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Authors: David Woodhouse <dwmw2@infradead.org>
* David Howells <dhowells@redhat.com>
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/sched.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/iversion.h>
#include "internal.h"
#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",
vnode->status.abort_code,
vnode->status.mode,
vnode->status.size,
vnode->status.data_version);
pr_warn("kAFS: vnode %llx:%llx:%x\n",
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique);
if (parent_vnode)
pr_warn("kAFS: dir %llx:%llx:%x\n",
parent_vnode->fid.vid,
parent_vnode->fid.vnode,
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,
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;
vnode->status = *status;
t = status->mtime_client;
inode->i_ctime = t;
inode->i_mtime = t;
inode->i_atime = t;
inode->i_flags |= S_NOATIME;
inode->i_uid = make_kuid(&init_user_ns, status->owner);
inode->i_gid = make_kgid(&init_user_ns, status->group);
set_nlink(&vnode->vfs_inode, status->nlink);
switch (status->type) {
case AFS_FTYPE_FILE:
inode->i_mode = S_IFREG | (status->mode & S_IALLUGO);
inode->i_op = &afs_file_inode_operations;
inode->i_fop = &afs_file_operations;
inode->i_mapping->a_ops = &afs_file_aops;
break;
case AFS_FTYPE_DIR:
inode->i_mode = S_IFDIR | (status->mode & S_IALLUGO);
inode->i_op = &afs_dir_inode_operations;
inode->i_fop = &afs_dir_file_operations;
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_symlink_aops;
} else {
inode->i_mode = S_IFLNK | status->mode;
inode->i_op = &afs_symlink_inode_operations;
inode->i_mapping->a_ops = &afs_symlink_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 (op=%x)\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 : "???",
op->debug_id);
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)) {
vnode->cb_expires_at = cb->expires_at;
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 {
__be32 vnode_id;
__be32 unique;
__be32 vnode_id_ext[2]; /* Allow for a 96-bit key */
} __packed key;
struct afs_vnode_cache_aux aux;
if (vnode->status.type != AFS_FTYPE_FILE) {
vnode->cache = NULL;
return;
}
key.vnode_id = htonl(vnode->fid.vnode);
key.unique = htonl(vnode->fid.unique);
key.vnode_id_ext[0] = htonl(vnode->fid.vnode >> 32);
key.vnode_id_ext[1] = htonl(vnode->fid.vnode_hi);
afs_set_cache_aux(vnode, &aux);
vnode->cache = fscache_acquire_cookie(
vnode->volume->cache,
vnode->status.type == AFS_FTYPE_FILE ? 0 : FSCACHE_ADV_SINGLE_CHUNK,
&key, sizeof(key),
&aux, sizeof(aux),
vnode->status.size);
#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);
afs_invalidate_cache(vnode, 0);
/* 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_cache_aux aux;
struct afs_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);
afs_set_cache_aux(vnode, &aux);
fscache_clear_inode_writeback(afs_vnode_cache(vnode), inode, &aux);
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
fscache_relinquish_cookie(vnode->cache,
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);
if (size != i_size)
fscache_resize_cookie(afs_vnode_cache(vp->vnode),
vp->scb.status.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)
{
const unsigned int supported =
ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | ATTR_TOUCH;
struct afs_operation *op;
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
struct inode *inode = &vnode->vfs_inode;
loff_t i_size;
int ret;
_enter("{%llx:%llu},{n=%pd},%x",
vnode->fid.vid, vnode->fid.vnode, dentry,
attr->ia_valid);
if (!(attr->ia_valid & supported)) {
_leave(" = 0 [unsupported]");
return 0;
}
i_size = i_size_read(inode);
if (attr->ia_valid & ATTR_SIZE) {
if (!S_ISREG(inode->i_mode))
return -EISDIR;
ret = inode_newsize_ok(inode, attr->ia_size);
if (ret)
return ret;
if (attr->ia_size == i_size)
attr->ia_valid &= ~ATTR_SIZE;
}
fscache_use_cookie(afs_vnode_cache(vnode), true);
/* Prevent any new writebacks from starting whilst we do this. */
down_write(&vnode->validate_lock);
if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode)) {
loff_t size = attr->ia_size;
/* Wait for any outstanding writes to the server to complete */
loff_t from = min(size, i_size);
loff_t to = max(size, i_size);
ret = filemap_fdatawait_range(inode->i_mapping, from, to);
if (ret < 0)
goto out_unlock;
/* Don't talk to the server if we're just shortening in-memory
* writes that haven't gone to the server yet.
*/
if (!(attr->ia_valid & (supported & ~ATTR_SIZE & ~ATTR_MTIME)) &&
attr->ia_size < i_size &&
attr->ia_size > vnode->status.size) {
truncate_pagecache(inode, attr->ia_size);
fscache_resize_cookie(afs_vnode_cache(vnode),
attr->ia_size);
i_size_write(inode, attr->ia_size);
ret = 0;
goto out_unlock;
}
}
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);
fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL);
_leave(" = %d", ret);
return ret;
}