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linux-sg2042/fs/afs/inode.c

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/*
* 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,
.listxattr = afs_listxattr,
};
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_vnode *vnode, struct key *key,
struct afs_cb_interest *cbi,
struct afs_vnode *parent_vnode,
struct afs_status_cb *scb)
{
struct afs_cb_interest *old_cbi = NULL;
struct afs_file_status *status = &scb->status;
struct inode *inode = AFS_VNODE_TO_I(vnode);
struct timespec64 t;
_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->status = *status;
t = status->mtime_client;
inode->i_ctime = t;
inode->i_mtime = t;
inode->i_atime = t;
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;
inode->i_op = &afs_file_inode_operations;
inode->i_fop = &afs_file_operations;
inode->i_mapping->a_ops = &afs_fs_aops;
break;
case AFS_FTYPE_DIR:
inode->i_mode = S_IFDIR | status->mode;
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_fs_aops;
} else {
inode->i_mode = S_IFLNK | status->mode;
inode->i_op = &afs_symlink_inode_operations;
inode->i_mapping->a_ops = &afs_fs_aops;
}
inode_nohighmem(inode);
break;
default:
dump_vnode(vnode, parent_vnode);
write_sequnlock(&vnode->cb_lock);
return afs_protocol_error(NULL, -EBADMSG, afs_eproto_file_type);
}
/*
* Estimate 512 bytes blocks used, rounded up to nearest 1K
* for consistency with other AFS clients.
*/
inode->i_blocks = ((i_size_read(inode) + 1023) >> 10) << 1;
i_size_write(&vnode->vfs_inode, status->size);
vnode->invalid_before = status->data_version;
inode_set_iversion_raw(&vnode->vfs_inode, status->data_version);
if (!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 = scb->callback.expires_at;
old_cbi = rcu_dereference_protected(vnode->cb_interest,
lockdep_is_held(&vnode->cb_lock.lock));
if (cbi != old_cbi)
rcu_assign_pointer(vnode->cb_interest, afs_get_cb_interest(cbi));
else
old_cbi = NULL;
set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
}
write_sequnlock(&vnode->cb_lock);
afs_put_cb_interest(afs_v2net(vnode), old_cbi);
return 0;
}
/*
* Update the core inode struct from a returned status record.
*/
static void afs_apply_status(struct afs_fs_cursor *fc,
struct afs_vnode *vnode,
struct afs_status_cb *scb,
const afs_dataversion_t *expected_version)
{
struct afs_file_status *status = &scb->status;
struct timespec64 t;
umode_t mode;
bool data_changed = false;
BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags));
if (status->type != vnode->status.type) {
pr_warning("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, -EBADMSG, afs_eproto_bad_status);
return;
}
if (status->nlink != vnode->status.nlink)
set_nlink(&vnode->vfs_inode, status->nlink);
if (status->owner != vnode->status.owner)
vnode->vfs_inode.i_uid = make_kuid(&init_user_ns, status->owner);
if (status->group != vnode->status.group)
vnode->vfs_inode.i_gid = make_kgid(&init_user_ns, status->group);
if (status->mode != vnode->status.mode) {
mode = vnode->vfs_inode.i_mode;
mode &= ~S_IALLUGO;
mode |= status->mode;
WRITE_ONCE(vnode->vfs_inode.i_mode, mode);
}
t = status->mtime_client;
vnode->vfs_inode.i_ctime = t;
vnode->vfs_inode.i_mtime = t;
vnode->vfs_inode.i_atime = t;
if (vnode->status.data_version != status->data_version)
data_changed = true;
vnode->status = *status;
if (expected_version &&
*expected_version != status->data_version) {
kdebug("vnode modified %llx on {%llx:%llu} [exp %llx] %s",
(unsigned long long) status->data_version,
vnode->fid.vid, vnode->fid.vnode,
(unsigned long long) *expected_version,
fc->type ? fc->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);
}
} 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;
}
if (data_changed) {
inode_set_iversion_raw(&vnode->vfs_inode, status->data_version);
i_size_write(&vnode->vfs_inode, status->size);
}
}
/*
* Apply a callback to a vnode.
*/
static void afs_apply_callback(struct afs_fs_cursor *fc,
struct afs_vnode *vnode,
struct afs_status_cb *scb,
unsigned int cb_break)
{
struct afs_cb_interest *old;
struct afs_callback *cb = &scb->callback;
if (!afs_cb_is_broken(cb_break, vnode, fc->cbi)) {
vnode->cb_expires_at = cb->expires_at;
old = rcu_dereference_protected(vnode->cb_interest,
lockdep_is_held(&vnode->cb_lock.lock));
if (old != fc->cbi) {
rcu_assign_pointer(vnode->cb_interest, afs_get_cb_interest(fc->cbi));
afs_put_cb_interest(afs_v2net(vnode), old);
}
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_fs_cursor *fc,
struct afs_vnode *vnode,
unsigned int cb_break,
const afs_dataversion_t *expected_version,
struct afs_status_cb *scb)
{
if (fc->ac.error != 0)
return;
write_seqlock(&vnode->cb_lock);
if (scb->have_error) {
if (scb->status.abort_code == VNOVNODE) {
set_bit(AFS_VNODE_DELETED, &vnode->flags);
clear_nlink(&vnode->vfs_inode);
__afs_break_callback(vnode);
}
} else {
if (scb->have_status)
afs_apply_status(fc, vnode, scb, expected_version);
if (scb->have_cb)
afs_apply_callback(fc, vnode, scb, cb_break);
}
write_sequnlock(&vnode->cb_lock);
if (fc->ac.error == 0 && scb->have_status)
afs_cache_permit(vnode, fc->key, cb_break, scb);
}
/*
* 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_status_cb *scb;
struct afs_fs_cursor fc;
int ret;
_enter("%s,{%llx:%llu.%u,S=%lx}",
vnode->volume->name,
vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
vnode->flags);
scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL);
if (!scb)
return -ENOMEM;
ret = -ERESTARTSYS;
if (afs_begin_vnode_operation(&fc, vnode, key, true)) {
afs_dataversion_t data_version = vnode->status.data_version;
while (afs_select_fileserver(&fc)) {
fc.cb_break = afs_calc_vnode_cb_break(vnode);
afs_fs_fetch_file_status(&fc, scb, NULL);
}
if (fc.error) {
/* Do nothing. */
} else if (is_new) {
ret = afs_inode_init_from_status(vnode, key, fc.cbi,
NULL, scb);
fc.error = ret;
if (ret == 0)
afs_cache_permit(vnode, key, fc.cb_break, scb);
} else {
afs_vnode_commit_status(&fc, vnode, fc.cb_break,
&data_version, scb);
}
afs_check_for_remote_deletion(&fc, vnode);
ret = afs_end_vnode_operation(&fc);
}
if (ret == 0 && _caller_access)
*_caller_access = scb->status.caller_access;
kfree(scb);
_leave(" = %d", ret);
return ret;
}
/*
* iget5() comparator
*/
int afs_iget5_test(struct inode *inode, void *opaque)
{
struct afs_iget_data *iget_data = opaque;
struct afs_vnode *vnode = AFS_FS_I(inode);
return memcmp(&vnode->fid, &iget_data->fid, sizeof(iget_data->fid)) == 0;
}
/*
* iget5() comparator for inode created by autocell operations
*
* These pseudo inodes don't match anything.
*/
static int afs_iget5_pseudo_dir_test(struct inode *inode, void *opaque)
{
return 0;
}
/*
* iget5() inode initialiser
*/
static int afs_iget5_set(struct inode *inode, void *opaque)
{
struct afs_iget_data *iget_data = opaque;
struct afs_vnode *vnode = AFS_FS_I(inode);
vnode->fid = iget_data->fid;
vnode->volume = iget_data->volume;
vnode->cb_v_break = iget_data->cb_v_break;
vnode->cb_s_break = iget_data->cb_s_break;
/* YFS supports 96-bit vnode IDs, but Linux only supports
* 64-bit inode numbers.
*/
inode->i_ino = iget_data->fid.vnode;
inode->i_generation = iget_data->fid.unique;
return 0;
}
/*
* Create an inode for a dynamic root directory or an autocell dynamic
* automount dir.
*/
struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root)
{
struct afs_super_info *as;
struct afs_vnode *vnode;
struct inode *inode;
static atomic_t afs_autocell_ino;
struct afs_iget_data iget_data = {
.cb_v_break = 0,
.cb_s_break = 0,
};
_enter("");
as = sb->s_fs_info;
if (as->volume) {
iget_data.volume = as->volume;
iget_data.fid.vid = as->volume->vid;
}
if (root) {
iget_data.fid.vnode = 1;
iget_data.fid.unique = 1;
} else {
iget_data.fid.vnode = atomic_inc_return(&afs_autocell_ino);
iget_data.fid.unique = 0;
}
inode = iget5_locked(sb, iget_data.fid.vnode,
afs_iget5_pseudo_dir_test, afs_iget5_set,
&iget_data);
if (!inode) {
_leave(" = -ENOMEM");
return ERR_PTR(-ENOMEM);
}
_debug("GOT INODE %p { ino=%lu, vl=%llx, vn=%llx, u=%x }",
inode, inode->i_ino, iget_data.fid.vid, iget_data.fid.vnode,
iget_data.fid.unique);
vnode = AFS_FS_I(inode);
/* there shouldn't be an existing inode */
BUG_ON(!(inode->i_state & I_NEW));
inode->i_size = 0;
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
if (root) {
inode->i_op = &afs_dynroot_inode_operations;
inode->i_fop = &afs_dynroot_file_operations;
} else {
inode->i_op = &afs_autocell_inode_operations;
}
set_nlink(inode, 2);
inode->i_uid = GLOBAL_ROOT_UID;
inode->i_gid = GLOBAL_ROOT_GID;
inode->i_ctime = inode->i_atime = inode->i_mtime = current_time(inode);
inode->i_blocks = 0;
inode_set_iversion_raw(inode, 0);
inode->i_generation = 0;
set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
if (!root) {
set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
inode->i_flags |= S_AUTOMOUNT;
}
inode->i_flags |= S_NOATIME;
unlock_new_inode(inode);
_leave(" = %p", inode);
return inode;
}
/*
* Get a cache cookie for an inode.
*/
static void afs_get_inode_cache(struct afs_vnode *vnode)
{
#ifdef CONFIG_AFS_FSCACHE
struct {
u32 vnode_id;
u32 unique;
u32 vnode_id_ext[2]; /* Allow for a 96-bit key */
} __packed key;
struct afs_vnode_cache_aux aux;
if (vnode->status.type == AFS_FTYPE_DIR) {
vnode->cache = NULL;
return;
}
key.vnode_id = vnode->fid.vnode;
key.unique = vnode->fid.unique;
key.vnode_id_ext[0] = vnode->fid.vnode >> 32;
key.vnode_id_ext[1] = vnode->fid.vnode_hi;
aux.data_version = vnode->status.data_version;
vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
&afs_vnode_cache_index_def,
&key, sizeof(key),
&aux, sizeof(aux),
vnode, vnode->status.size, true);
#endif
}
/*
* inode retrieval
*/
struct inode *afs_iget(struct super_block *sb, struct key *key,
struct afs_iget_data *iget_data,
struct afs_status_cb *scb,
struct afs_cb_interest *cbi,
struct afs_vnode *parent_vnode)
{
struct afs_super_info *as;
struct afs_vnode *vnode;
struct afs_fid *fid = &iget_data->fid;
struct inode *inode;
int ret;
_enter(",{%llx:%llu.%u},,", fid->vid, fid->vnode, fid->unique);
as = sb->s_fs_info;
iget_data->volume = as->volume;
inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
iget_data);
if (!inode) {
_leave(" = -ENOMEM");
return ERR_PTR(-ENOMEM);
}
_debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
inode, fid->vid, fid->vnode, fid->unique);
vnode = AFS_FS_I(inode);
/* deal with an existing inode */
if (!(inode->i_state & I_NEW)) {
_leave(" = %p", inode);
return inode;
}
if (!scb) {
/* it's a remotely extant inode */
ret = afs_fetch_status(vnode, key, true, NULL);
if (ret < 0)
goto bad_inode;
} else {
ret = afs_inode_init_from_status(vnode, key, cbi, parent_vnode,
scb);
if (ret < 0)
goto bad_inode;
}
afs_get_inode_cache(vnode);
/* success */
clear_bit(AFS_VNODE_UNSET, &vnode->flags);
inode->i_flags |= S_NOATIME;
unlock_new_inode(inode);
_leave(" = %p", inode);
return inode;
/* failure */
bad_inode:
iget_failed(inode);
_leave(" = %d [bad]", ret);
return ERR_PTR(ret);
}
/*
* mark the data attached to an inode as obsolete due to a write on the server
* - might also want to ditch all the outstanding writes and dirty pages
*/
void afs_zap_data(struct afs_vnode *vnode)
{
_enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode);
#ifdef CONFIG_AFS_FSCACHE
fscache_invalidate(vnode->cache);
#endif
/* nuke all the non-dirty pages that aren't locked, mapped or being
* written back in a regular file and completely discard the pages in a
* directory or symlink */
if (S_ISREG(vnode->vfs_inode.i_mode))
invalidate_remote_inode(&vnode->vfs_inode);
else
invalidate_inode_pages2(vnode->vfs_inode.i_mapping);
}
/*
* Check the validity of a vnode/inode.
*/
bool afs_check_validity(struct afs_vnode *vnode)
{
struct afs_cb_interest *cbi;
struct afs_server *server;
struct afs_volume *volume = vnode->volume;
time64_t now = ktime_get_real_seconds();
bool valid, need_clear = false;
unsigned int cb_break, cb_s_break, cb_v_break;
int seq = 0;
do {
read_seqbegin_or_lock(&vnode->cb_lock, &seq);
cb_v_break = READ_ONCE(volume->cb_v_break);
cb_break = vnode->cb_break;
if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
cbi = rcu_dereference(vnode->cb_interest);
server = rcu_dereference(cbi->server);
cb_s_break = READ_ONCE(server->cb_s_break);
if (vnode->cb_s_break != cb_s_break ||
vnode->cb_v_break != cb_v_break) {
vnode->cb_s_break = cb_s_break;
vnode->cb_v_break = cb_v_break;
need_clear = true;
valid = false;
} else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
need_clear = true;
valid = false;
} else if (vnode->cb_expires_at - 10 <= now) {
need_clear = true;
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) {
write_seqlock(&vnode->cb_lock);
if (cb_break == vnode->cb_break)
__afs_break_callback(vnode);
write_sequnlock(&vnode->cb_lock);
valid = false;
}
return valid;
}
/*
* validate a vnode/inode
* - there are several things we need to check
* - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
* symlink)
* - parent dir metadata changed (security changes)
* - dentry data changed (write, truncate)
* - dentry metadata changed (security changes)
*/
int afs_validate(struct afs_vnode *vnode, struct key *key)
{
bool valid;
int ret;
_enter("{v={%llx:%llu} fl=%lx},%x",
vnode->fid.vid, vnode->fid.vnode, vnode->flags,
key_serial(key));
rcu_read_lock();
valid = afs_check_validity(vnode);
rcu_read_unlock();
if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
clear_nlink(&vnode->vfs_inode);
if (valid)
goto valid;
down_write(&vnode->validate_lock);
/* if the promise has expired, we need to check the server again to get
* a new promise - note that if the (parent) directory's metadata was
* changed then the security may be different and we may no longer have
* access */
if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
_debug("not promised");
ret = afs_fetch_status(vnode, key, false, NULL);
if (ret < 0) {
if (ret == -ENOENT) {
set_bit(AFS_VNODE_DELETED, &vnode->flags);
ret = -ESTALE;
}
goto error_unlock;
}
_debug("new promise [fl=%lx]", vnode->flags);
}
if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
_debug("file already deleted");
ret = -ESTALE;
goto error_unlock;
}
/* if the vnode's data version number changed then its contents are
* different */
if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
afs_zap_data(vnode);
up_write(&vnode->validate_lock);
valid:
_leave(" = 0");
return 0;
error_unlock:
up_write(&vnode->validate_lock);
_leave(" = %d", ret);
return ret;
}
/*
* read the attributes of an inode
*/
int afs_getattr(const struct path *path, struct kstat *stat,
u32 request_mask, unsigned int query_flags)
{
struct inode *inode = d_inode(path->dentry);
struct afs_vnode *vnode = AFS_FS_I(inode);
int seq = 0;
_enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
do {
read_seqbegin_or_lock(&vnode->cb_lock, &seq);
generic_fillattr(inode, stat);
} while (need_seqretry(&vnode->cb_lock, seq));
done_seqretry(&vnode->cb_lock, seq);
return 0;
}
/*
* discard an AFS inode
*/
int afs_drop_inode(struct inode *inode)
{
_enter("");
if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
return generic_delete_inode(inode);
else
return generic_drop_inode(inode);
}
/*
* clear an AFS inode
*/
void afs_evict_inode(struct inode *inode)
{
struct afs_cb_interest *cbi;
struct afs_vnode *vnode;
vnode = AFS_FS_I(inode);
_enter("{%llx:%llu.%d}",
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique);
_debug("CLEAR INODE %p", inode);
ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
truncate_inode_pages_final(&inode->i_data);
clear_inode(inode);
write_seqlock(&vnode->cb_lock);
cbi = rcu_dereference_protected(vnode->cb_interest,
lockdep_is_held(&vnode->cb_lock.lock));
if (cbi) {
afs_put_cb_interest(afs_i2net(inode), cbi);
rcu_assign_pointer(vnode->cb_interest, NULL);
}
write_sequnlock(&vnode->cb_lock);
while (!list_empty(&vnode->wb_keys)) {
struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
struct afs_wb_key, vnode_link);
list_del(&wbk->vnode_link);
afs_put_wb_key(wbk);
}
#ifdef CONFIG_AFS_FSCACHE
{
struct afs_vnode_cache_aux aux;
aux.data_version = vnode->status.data_version;
fscache_relinquish_cookie(vnode->cache, &aux,
test_bit(AFS_VNODE_DELETED, &vnode->flags));
vnode->cache = NULL;
}
#endif
afs_prune_wb_keys(vnode);
afs_put_permits(rcu_access_pointer(vnode->permit_cache));
key_put(vnode->silly_key);
vnode->silly_key = NULL;
key_put(vnode->lock_key);
vnode->lock_key = NULL;
_leave("");
}
/*
* set the attributes of an inode
*/
int afs_setattr(struct dentry *dentry, struct iattr *attr)
{
struct afs_fs_cursor fc;
struct afs_status_cb *scb;
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
struct key *key;
int ret = -ENOMEM;
_enter("{%llx:%llu},{n=%pd},%x",
vnode->fid.vid, vnode->fid.vnode, dentry,
attr->ia_valid);
if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
ATTR_MTIME))) {
_leave(" = 0 [unsupported]");
return 0;
}
scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL);
if (!scb)
goto error;
/* flush any dirty data outstanding on a regular file */
if (S_ISREG(vnode->vfs_inode.i_mode))
filemap_write_and_wait(vnode->vfs_inode.i_mapping);
if (attr->ia_valid & ATTR_FILE) {
key = afs_file_key(attr->ia_file);
} else {
key = afs_request_key(vnode->volume->cell);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error_scb;
}
}
ret = -ERESTARTSYS;
if (afs_begin_vnode_operation(&fc, vnode, key, false)) {
afs_dataversion_t data_version = vnode->status.data_version;
if (attr->ia_valid & ATTR_SIZE)
data_version++;
while (afs_select_fileserver(&fc)) {
fc.cb_break = afs_calc_vnode_cb_break(vnode);
afs_fs_setattr(&fc, attr, scb);
}
afs_check_for_remote_deletion(&fc, vnode);
afs_vnode_commit_status(&fc, vnode, fc.cb_break,
&data_version, scb);
ret = afs_end_vnode_operation(&fc);
}
if (!(attr->ia_valid & ATTR_FILE))
key_put(key);
error_scb:
kfree(scb);
error:
_leave(" = %d", ret);
return ret;
}
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