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linux/fs/ceph/inode.c
Jeff Layton 4b82228700 ceph: handle the case where a dentry has been renamed on outstanding req 
It's possible for us to issue a lookup to revalidate a dentry
concurrently with a rename. If done in the right order, then we could
end up processing dentry info in the reply that no longer reflects the
state of the dentry.

If req->r_dentry->d_name differs from the one in the trace, then just
ignore the trace in the reply. We only need to do this however if the
parent's i_rwsem is not held.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2019-04-23 21:37:54 +02:00

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// SPDX-License-Identifier: GPL-2.0
#include <linux/ceph/ceph_debug.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/kernel.h>
#include <linux/writeback.h>
#include <linux/vmalloc.h>
#include <linux/xattr.h>
#include <linux/posix_acl.h>
#include <linux/random.h>
#include <linux/sort.h>
#include "super.h"
#include "mds_client.h"
#include "cache.h"
#include <linux/ceph/decode.h>
/*
* Ceph inode operations
*
* Implement basic inode helpers (get, alloc) and inode ops (getattr,
* setattr, etc.), xattr helpers, and helpers for assimilating
* metadata returned by the MDS into our cache.
*
* Also define helpers for doing asynchronous writeback, invalidation,
* and truncation for the benefit of those who can't afford to block
* (typically because they are in the message handler path).
*/
static const struct inode_operations ceph_symlink_iops;
static void ceph_invalidate_work(struct work_struct *work);
static void ceph_writeback_work(struct work_struct *work);
static void ceph_vmtruncate_work(struct work_struct *work);
/*
* find or create an inode, given the ceph ino number
*/
static int ceph_set_ino_cb(struct inode *inode, void *data)
{
ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
return 0;
}
struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
{
struct inode *inode;
ino_t t = ceph_vino_to_ino(vino);
inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
if (!inode)
return ERR_PTR(-ENOMEM);
if (inode->i_state & I_NEW) {
dout("get_inode created new inode %p %llx.%llx ino %llx\n",
inode, ceph_vinop(inode), (u64)inode->i_ino);
unlock_new_inode(inode);
}
dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
vino.snap, inode);
return inode;
}
/*
* get/constuct snapdir inode for a given directory
*/
struct inode *ceph_get_snapdir(struct inode *parent)
{
struct ceph_vino vino = {
.ino = ceph_ino(parent),
.snap = CEPH_SNAPDIR,
};
struct inode *inode = ceph_get_inode(parent->i_sb, vino);
struct ceph_inode_info *ci = ceph_inode(inode);
BUG_ON(!S_ISDIR(parent->i_mode));
if (IS_ERR(inode))
return inode;
inode->i_mode = parent->i_mode;
inode->i_uid = parent->i_uid;
inode->i_gid = parent->i_gid;
inode->i_op = &ceph_snapdir_iops;
inode->i_fop = &ceph_snapdir_fops;
ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
ci->i_rbytes = 0;
return inode;
}
const struct inode_operations ceph_file_iops = {
.permission = ceph_permission,
.setattr = ceph_setattr,
.getattr = ceph_getattr,
.listxattr = ceph_listxattr,
.get_acl = ceph_get_acl,
.set_acl = ceph_set_acl,
};
/*
* We use a 'frag tree' to keep track of the MDS's directory fragments
* for a given inode (usually there is just a single fragment). We
* need to know when a child frag is delegated to a new MDS, or when
* it is flagged as replicated, so we can direct our requests
* accordingly.
*/
/*
* find/create a frag in the tree
*/
static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
u32 f)
{
struct rb_node **p;
struct rb_node *parent = NULL;
struct ceph_inode_frag *frag;
int c;
p = &ci->i_fragtree.rb_node;
while (*p) {
parent = *p;
frag = rb_entry(parent, struct ceph_inode_frag, node);
c = ceph_frag_compare(f, frag->frag);
if (c < 0)
p = &(*p)->rb_left;
else if (c > 0)
p = &(*p)->rb_right;
else
return frag;
}
frag = kmalloc(sizeof(*frag), GFP_NOFS);
if (!frag)
return ERR_PTR(-ENOMEM);
frag->frag = f;
frag->split_by = 0;
frag->mds = -1;
frag->ndist = 0;
rb_link_node(&frag->node, parent, p);
rb_insert_color(&frag->node, &ci->i_fragtree);
dout("get_or_create_frag added %llx.%llx frag %x\n",
ceph_vinop(&ci->vfs_inode), f);
return frag;
}
/*
* find a specific frag @f
*/
struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
{
struct rb_node *n = ci->i_fragtree.rb_node;
while (n) {
struct ceph_inode_frag *frag =
rb_entry(n, struct ceph_inode_frag, node);
int c = ceph_frag_compare(f, frag->frag);
if (c < 0)
n = n->rb_left;
else if (c > 0)
n = n->rb_right;
else
return frag;
}
return NULL;
}
/*
* Choose frag containing the given value @v. If @pfrag is
* specified, copy the frag delegation info to the caller if
* it is present.
*/
static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
struct ceph_inode_frag *pfrag, int *found)
{
u32 t = ceph_frag_make(0, 0);
struct ceph_inode_frag *frag;
unsigned nway, i;
u32 n;
if (found)
*found = 0;
while (1) {
WARN_ON(!ceph_frag_contains_value(t, v));
frag = __ceph_find_frag(ci, t);
if (!frag)
break; /* t is a leaf */
if (frag->split_by == 0) {
if (pfrag)
memcpy(pfrag, frag, sizeof(*pfrag));
if (found)
*found = 1;
break;
}
/* choose child */
nway = 1 << frag->split_by;
dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
frag->split_by, nway);
for (i = 0; i < nway; i++) {
n = ceph_frag_make_child(t, frag->split_by, i);
if (ceph_frag_contains_value(n, v)) {
t = n;
break;
}
}
BUG_ON(i == nway);
}
dout("choose_frag(%x) = %x\n", v, t);
return t;
}
u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
struct ceph_inode_frag *pfrag, int *found)
{
u32 ret;
mutex_lock(&ci->i_fragtree_mutex);
ret = __ceph_choose_frag(ci, v, pfrag, found);
mutex_unlock(&ci->i_fragtree_mutex);
return ret;
}
/*
* Process dirfrag (delegation) info from the mds. Include leaf
* fragment in tree ONLY if ndist > 0. Otherwise, only
* branches/splits are included in i_fragtree)
*/
static int ceph_fill_dirfrag(struct inode *inode,
struct ceph_mds_reply_dirfrag *dirinfo)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_inode_frag *frag;
u32 id = le32_to_cpu(dirinfo->frag);
int mds = le32_to_cpu(dirinfo->auth);
int ndist = le32_to_cpu(dirinfo->ndist);
int diri_auth = -1;
int i;
int err = 0;
spin_lock(&ci->i_ceph_lock);
if (ci->i_auth_cap)
diri_auth = ci->i_auth_cap->mds;
spin_unlock(&ci->i_ceph_lock);
if (mds == -1) /* CDIR_AUTH_PARENT */
mds = diri_auth;
mutex_lock(&ci->i_fragtree_mutex);
if (ndist == 0 && mds == diri_auth) {
/* no delegation info needed. */
frag = __ceph_find_frag(ci, id);
if (!frag)
goto out;
if (frag->split_by == 0) {
/* tree leaf, remove */
dout("fill_dirfrag removed %llx.%llx frag %x"
" (no ref)\n", ceph_vinop(inode), id);
rb_erase(&frag->node, &ci->i_fragtree);
kfree(frag);
} else {
/* tree branch, keep and clear */
dout("fill_dirfrag cleared %llx.%llx frag %x"
" referral\n", ceph_vinop(inode), id);
frag->mds = -1;
frag->ndist = 0;
}
goto out;
}
/* find/add this frag to store mds delegation info */
frag = __get_or_create_frag(ci, id);
if (IS_ERR(frag)) {
/* this is not the end of the world; we can continue
with bad/inaccurate delegation info */
pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
err = -ENOMEM;
goto out;
}
frag->mds = mds;
frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
for (i = 0; i < frag->ndist; i++)
frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
ceph_vinop(inode), frag->frag, frag->ndist);
out:
mutex_unlock(&ci->i_fragtree_mutex);
return err;
}
static int frag_tree_split_cmp(const void *l, const void *r)
{
struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
return ceph_frag_compare(le32_to_cpu(ls->frag),
le32_to_cpu(rs->frag));
}
static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
{
if (!frag)
return f == ceph_frag_make(0, 0);
if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
return false;
return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
}
static int ceph_fill_fragtree(struct inode *inode,
struct ceph_frag_tree_head *fragtree,
struct ceph_mds_reply_dirfrag *dirinfo)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_inode_frag *frag, *prev_frag = NULL;
struct rb_node *rb_node;
unsigned i, split_by, nsplits;
u32 id;
bool update = false;
mutex_lock(&ci->i_fragtree_mutex);
nsplits = le32_to_cpu(fragtree->nsplits);
if (nsplits != ci->i_fragtree_nsplits) {
update = true;
} else if (nsplits) {
i = prandom_u32() % nsplits;
id = le32_to_cpu(fragtree->splits[i].frag);
if (!__ceph_find_frag(ci, id))
update = true;
} else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
rb_node = rb_first(&ci->i_fragtree);
frag = rb_entry(rb_node, struct ceph_inode_frag, node);
if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
update = true;
}
if (!update && dirinfo) {
id = le32_to_cpu(dirinfo->frag);
if (id != __ceph_choose_frag(ci, id, NULL, NULL))
update = true;
}
if (!update)
goto out_unlock;
if (nsplits > 1) {
sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
frag_tree_split_cmp, NULL);
}
dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
rb_node = rb_first(&ci->i_fragtree);
for (i = 0; i < nsplits; i++) {
id = le32_to_cpu(fragtree->splits[i].frag);
split_by = le32_to_cpu(fragtree->splits[i].by);
if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
"frag %x split by %d\n", ceph_vinop(inode),
i, nsplits, id, split_by);
continue;
}
frag = NULL;
while (rb_node) {
frag = rb_entry(rb_node, struct ceph_inode_frag, node);
if (ceph_frag_compare(frag->frag, id) >= 0) {
if (frag->frag != id)
frag = NULL;
else
rb_node = rb_next(rb_node);
break;
}
rb_node = rb_next(rb_node);
/* delete stale split/leaf node */
if (frag->split_by > 0 ||
!is_frag_child(frag->frag, prev_frag)) {
rb_erase(&frag->node, &ci->i_fragtree);
if (frag->split_by > 0)
ci->i_fragtree_nsplits--;
kfree(frag);
}
frag = NULL;
}
if (!frag) {
frag = __get_or_create_frag(ci, id);
if (IS_ERR(frag))
continue;
}
if (frag->split_by == 0)
ci->i_fragtree_nsplits++;
frag->split_by = split_by;
dout(" frag %x split by %d\n", frag->frag, frag->split_by);
prev_frag = frag;
}
while (rb_node) {
frag = rb_entry(rb_node, struct ceph_inode_frag, node);
rb_node = rb_next(rb_node);
/* delete stale split/leaf node */
if (frag->split_by > 0 ||
!is_frag_child(frag->frag, prev_frag)) {
rb_erase(&frag->node, &ci->i_fragtree);
if (frag->split_by > 0)
ci->i_fragtree_nsplits--;
kfree(frag);
}
}
out_unlock:
mutex_unlock(&ci->i_fragtree_mutex);
return 0;
}
/*
* initialize a newly allocated inode.
*/
struct inode *ceph_alloc_inode(struct super_block *sb)
{
struct ceph_inode_info *ci;
int i;
ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
if (!ci)
return NULL;
dout("alloc_inode %p\n", &ci->vfs_inode);
spin_lock_init(&ci->i_ceph_lock);
ci->i_version = 0;
ci->i_inline_version = 0;
ci->i_time_warp_seq = 0;
ci->i_ceph_flags = 0;
atomic64_set(&ci->i_ordered_count, 1);
atomic64_set(&ci->i_release_count, 1);
atomic64_set(&ci->i_complete_seq[0], 0);
atomic64_set(&ci->i_complete_seq[1], 0);
ci->i_symlink = NULL;
ci->i_max_bytes = 0;
ci->i_max_files = 0;
memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
ci->i_fragtree = RB_ROOT;
mutex_init(&ci->i_fragtree_mutex);
ci->i_xattrs.blob = NULL;
ci->i_xattrs.prealloc_blob = NULL;
ci->i_xattrs.dirty = false;
ci->i_xattrs.index = RB_ROOT;
ci->i_xattrs.count = 0;
ci->i_xattrs.names_size = 0;
ci->i_xattrs.vals_size = 0;
ci->i_xattrs.version = 0;
ci->i_xattrs.index_version = 0;
ci->i_caps = RB_ROOT;
ci->i_auth_cap = NULL;
ci->i_dirty_caps = 0;
ci->i_flushing_caps = 0;
INIT_LIST_HEAD(&ci->i_dirty_item);
INIT_LIST_HEAD(&ci->i_flushing_item);
ci->i_prealloc_cap_flush = NULL;
INIT_LIST_HEAD(&ci->i_cap_flush_list);
init_waitqueue_head(&ci->i_cap_wq);
ci->i_hold_caps_min = 0;
ci->i_hold_caps_max = 0;
INIT_LIST_HEAD(&ci->i_cap_delay_list);
INIT_LIST_HEAD(&ci->i_cap_snaps);
ci->i_head_snapc = NULL;
ci->i_snap_caps = 0;
for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
ci->i_nr_by_mode[i] = 0;
mutex_init(&ci->i_truncate_mutex);
ci->i_truncate_seq = 0;
ci->i_truncate_size = 0;
ci->i_truncate_pending = 0;
ci->i_max_size = 0;
ci->i_reported_size = 0;
ci->i_wanted_max_size = 0;
ci->i_requested_max_size = 0;
ci->i_pin_ref = 0;
ci->i_rd_ref = 0;
ci->i_rdcache_ref = 0;
ci->i_wr_ref = 0;
ci->i_wb_ref = 0;
ci->i_wrbuffer_ref = 0;
ci->i_wrbuffer_ref_head = 0;
atomic_set(&ci->i_filelock_ref, 0);
atomic_set(&ci->i_shared_gen, 1);
ci->i_rdcache_gen = 0;
ci->i_rdcache_revoking = 0;
INIT_LIST_HEAD(&ci->i_unsafe_dirops);
INIT_LIST_HEAD(&ci->i_unsafe_iops);
spin_lock_init(&ci->i_unsafe_lock);
ci->i_snap_realm = NULL;
INIT_LIST_HEAD(&ci->i_snap_realm_item);
INIT_LIST_HEAD(&ci->i_snap_flush_item);
INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
ceph_fscache_inode_init(ci);
return &ci->vfs_inode;
}
static void ceph_i_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
struct ceph_inode_info *ci = ceph_inode(inode);
kfree(ci->i_symlink);
kmem_cache_free(ceph_inode_cachep, ci);
}
void ceph_destroy_inode(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_inode_frag *frag;
struct rb_node *n;
dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
ceph_fscache_unregister_inode_cookie(ci);
__ceph_remove_caps(inode);
if (__ceph_has_any_quota(ci))
ceph_adjust_quota_realms_count(inode, false);
/*
* we may still have a snap_realm reference if there are stray
* caps in i_snap_caps.
*/
if (ci->i_snap_realm) {
struct ceph_mds_client *mdsc =
ceph_inode_to_client(inode)->mdsc;
if (ceph_snap(inode) == CEPH_NOSNAP) {
struct ceph_snap_realm *realm = ci->i_snap_realm;
dout(" dropping residual ref to snap realm %p\n",
realm);
spin_lock(&realm->inodes_with_caps_lock);
list_del_init(&ci->i_snap_realm_item);
ci->i_snap_realm = NULL;
if (realm->ino == ci->i_vino.ino)
realm->inode = NULL;
spin_unlock(&realm->inodes_with_caps_lock);
ceph_put_snap_realm(mdsc, realm);
} else {
ceph_put_snapid_map(mdsc, ci->i_snapid_map);
ci->i_snap_realm = NULL;
}
}
while ((n = rb_first(&ci->i_fragtree)) != NULL) {
frag = rb_entry(n, struct ceph_inode_frag, node);
rb_erase(n, &ci->i_fragtree);
kfree(frag);
}
ci->i_fragtree_nsplits = 0;
__ceph_destroy_xattrs(ci);
if (ci->i_xattrs.blob)
ceph_buffer_put(ci->i_xattrs.blob);
if (ci->i_xattrs.prealloc_blob)
ceph_buffer_put(ci->i_xattrs.prealloc_blob);
ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
call_rcu(&inode->i_rcu, ceph_i_callback);
}
int ceph_drop_inode(struct inode *inode)
{
/*
* Positve dentry and corresponding inode are always accompanied
* in MDS reply. So no need to keep inode in the cache after
* dropping all its aliases.
*/
return 1;
}
static inline blkcnt_t calc_inode_blocks(u64 size)
{
return (size + (1<<9) - 1) >> 9;
}
/*
* Helpers to fill in size, ctime, mtime, and atime. We have to be
* careful because either the client or MDS may have more up to date
* info, depending on which capabilities are held, and whether
* time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
* and size are monotonically increasing, except when utimes() or
* truncate() increments the corresponding _seq values.)
*/
int ceph_fill_file_size(struct inode *inode, int issued,
u32 truncate_seq, u64 truncate_size, u64 size)
{
struct ceph_inode_info *ci = ceph_inode(inode);
int queue_trunc = 0;
if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
(truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
dout("size %lld -> %llu\n", inode->i_size, size);
if (size > 0 && S_ISDIR(inode->i_mode)) {
pr_err("fill_file_size non-zero size for directory\n");
size = 0;
}
i_size_write(inode, size);
inode->i_blocks = calc_inode_blocks(size);
ci->i_reported_size = size;
if (truncate_seq != ci->i_truncate_seq) {
dout("truncate_seq %u -> %u\n",
ci->i_truncate_seq, truncate_seq);
ci->i_truncate_seq = truncate_seq;
/* the MDS should have revoked these caps */
WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
CEPH_CAP_FILE_RD |
CEPH_CAP_FILE_WR |
CEPH_CAP_FILE_LAZYIO));
/*
* If we hold relevant caps, or in the case where we're
* not the only client referencing this file and we
* don't hold those caps, then we need to check whether
* the file is either opened or mmaped
*/
if ((issued & (CEPH_CAP_FILE_CACHE|
CEPH_CAP_FILE_BUFFER)) ||
mapping_mapped(inode->i_mapping) ||
__ceph_caps_file_wanted(ci)) {
ci->i_truncate_pending++;
queue_trunc = 1;
}
}
}
if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
ci->i_truncate_size != truncate_size) {
dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
truncate_size);
ci->i_truncate_size = truncate_size;
}
if (queue_trunc)
ceph_fscache_invalidate(inode);
return queue_trunc;
}
void ceph_fill_file_time(struct inode *inode, int issued,
u64 time_warp_seq, struct timespec64 *ctime,
struct timespec64 *mtime, struct timespec64 *atime)
{
struct ceph_inode_info *ci = ceph_inode(inode);
int warn = 0;
if (issued & (CEPH_CAP_FILE_EXCL|
CEPH_CAP_FILE_WR|
CEPH_CAP_FILE_BUFFER|
CEPH_CAP_AUTH_EXCL|
CEPH_CAP_XATTR_EXCL)) {
if (ci->i_version == 0 ||
timespec64_compare(ctime, &inode->i_ctime) > 0) {
dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
ctime->tv_sec, ctime->tv_nsec);
inode->i_ctime = *ctime;
}
if (ci->i_version == 0 ||
ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
/* the MDS did a utimes() */
dout("mtime %lld.%09ld -> %lld.%09ld "
"tw %d -> %d\n",
inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
mtime->tv_sec, mtime->tv_nsec,
ci->i_time_warp_seq, (int)time_warp_seq);
inode->i_mtime = *mtime;
inode->i_atime = *atime;
ci->i_time_warp_seq = time_warp_seq;
} else if (time_warp_seq == ci->i_time_warp_seq) {
/* nobody did utimes(); take the max */
if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
inode->i_mtime.tv_sec,
inode->i_mtime.tv_nsec,
mtime->tv_sec, mtime->tv_nsec);
inode->i_mtime = *mtime;
}
if (timespec64_compare(atime, &inode->i_atime) > 0) {
dout("atime %lld.%09ld -> %lld.%09ld inc\n",
inode->i_atime.tv_sec,
inode->i_atime.tv_nsec,
atime->tv_sec, atime->tv_nsec);
inode->i_atime = *atime;
}
} else if (issued & CEPH_CAP_FILE_EXCL) {
/* we did a utimes(); ignore mds values */
} else {
warn = 1;
}
} else {
/* we have no write|excl caps; whatever the MDS says is true */
if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
inode->i_ctime = *ctime;
inode->i_mtime = *mtime;
inode->i_atime = *atime;
ci->i_time_warp_seq = time_warp_seq;
} else {
warn = 1;
}
}
if (warn) /* time_warp_seq shouldn't go backwards */
dout("%p mds time_warp_seq %llu < %u\n",
inode, time_warp_seq, ci->i_time_warp_seq);
}
/*
* Populate an inode based on info from mds. May be called on new or
* existing inodes.
*/
static int fill_inode(struct inode *inode, struct page *locked_page,
struct ceph_mds_reply_info_in *iinfo,
struct ceph_mds_reply_dirfrag *dirinfo,
struct ceph_mds_session *session,
unsigned long ttl_from, int cap_fmode,
struct ceph_cap_reservation *caps_reservation)
{
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
struct ceph_mds_reply_inode *info = iinfo->in;
struct ceph_inode_info *ci = ceph_inode(inode);
int issued, new_issued, info_caps;
struct timespec64 mtime, atime, ctime;
struct ceph_buffer *xattr_blob = NULL;
struct ceph_string *pool_ns = NULL;
struct ceph_cap *new_cap = NULL;
int err = 0;
bool wake = false;
bool queue_trunc = false;
bool new_version = false;
bool fill_inline = false;
dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
inode, ceph_vinop(inode), le64_to_cpu(info->version),
ci->i_version);
info_caps = le32_to_cpu(info->cap.caps);
/* prealloc new cap struct */
if (info_caps && ceph_snap(inode) == CEPH_NOSNAP)
new_cap = ceph_get_cap(mdsc, caps_reservation);
/*
* prealloc xattr data, if it looks like we'll need it. only
* if len > 4 (meaning there are actually xattrs; the first 4
* bytes are the xattr count).
*/
if (iinfo->xattr_len > 4) {
xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
if (!xattr_blob)
pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
iinfo->xattr_len);
}
if (iinfo->pool_ns_len > 0)
pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
iinfo->pool_ns_len);
if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
spin_lock(&ci->i_ceph_lock);
/*
* provided version will be odd if inode value is projected,
* even if stable. skip the update if we have newer stable
* info (ours>=theirs, e.g. due to racing mds replies), unless
* we are getting projected (unstable) info (in which case the
* version is odd, and we want ours>theirs).
* us them
* 2 2 skip
* 3 2 skip
* 3 3 update
*/
if (ci->i_version == 0 ||
((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
le64_to_cpu(info->version) > (ci->i_version & ~1)))
new_version = true;
__ceph_caps_issued(ci, &issued);
issued |= __ceph_caps_dirty(ci);
new_issued = ~issued & info_caps;
/* update inode */
inode->i_rdev = le32_to_cpu(info->rdev);
inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
__ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
(issued & CEPH_CAP_AUTH_EXCL) == 0) {
inode->i_mode = le32_to_cpu(info->mode);
inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
from_kuid(&init_user_ns, inode->i_uid),
from_kgid(&init_user_ns, inode->i_gid));
}
if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
(issued & CEPH_CAP_LINK_EXCL) == 0)
set_nlink(inode, le32_to_cpu(info->nlink));
if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
/* be careful with mtime, atime, size */
ceph_decode_timespec64(&atime, &info->atime);
ceph_decode_timespec64(&mtime, &info->mtime);
ceph_decode_timespec64(&ctime, &info->ctime);
ceph_fill_file_time(inode, issued,
le32_to_cpu(info->time_warp_seq),
&ctime, &mtime, &atime);
}
if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
ci->i_files = le64_to_cpu(info->files);
ci->i_subdirs = le64_to_cpu(info->subdirs);
}
if (new_version ||
(new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
s64 old_pool = ci->i_layout.pool_id;
struct ceph_string *old_ns;
ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
lockdep_is_held(&ci->i_ceph_lock));
rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
pool_ns = old_ns;
queue_trunc = ceph_fill_file_size(inode, issued,
le32_to_cpu(info->truncate_seq),
le64_to_cpu(info->truncate_size),
le64_to_cpu(info->size));
/* only update max_size on auth cap */
if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
ci->i_max_size != le64_to_cpu(info->max_size)) {
dout("max_size %lld -> %llu\n", ci->i_max_size,
le64_to_cpu(info->max_size));
ci->i_max_size = le64_to_cpu(info->max_size);
}
}
/* layout and rstat are not tracked by capability, update them if
* the inode info is from auth mds */
if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
if (S_ISDIR(inode->i_mode)) {
ci->i_dir_layout = iinfo->dir_layout;
ci->i_rbytes = le64_to_cpu(info->rbytes);
ci->i_rfiles = le64_to_cpu(info->rfiles);
ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
ci->i_dir_pin = iinfo->dir_pin;
ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
}
}
/* xattrs */
/* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) &&
le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
if (ci->i_xattrs.blob)
ceph_buffer_put(ci->i_xattrs.blob);
ci->i_xattrs.blob = xattr_blob;
if (xattr_blob)
memcpy(ci->i_xattrs.blob->vec.iov_base,
iinfo->xattr_data, iinfo->xattr_len);
ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
ceph_forget_all_cached_acls(inode);
xattr_blob = NULL;
}
/* finally update i_version */
if (le64_to_cpu(info->version) > ci->i_version)
ci->i_version = le64_to_cpu(info->version);
inode->i_mapping->a_ops = &ceph_aops;
switch (inode->i_mode & S_IFMT) {
case S_IFIFO:
case S_IFBLK:
case S_IFCHR:
case S_IFSOCK:
inode->i_blkbits = PAGE_SHIFT;
init_special_inode(inode, inode->i_mode, inode->i_rdev);
inode->i_op = &ceph_file_iops;
break;
case S_IFREG:
inode->i_op = &ceph_file_iops;
inode->i_fop = &ceph_file_fops;
break;
case S_IFLNK:
inode->i_op = &ceph_symlink_iops;
if (!ci->i_symlink) {
u32 symlen = iinfo->symlink_len;
char *sym;
spin_unlock(&ci->i_ceph_lock);
if (symlen != i_size_read(inode)) {
pr_err("fill_inode %llx.%llx BAD symlink "
"size %lld\n", ceph_vinop(inode),
i_size_read(inode));
i_size_write(inode, symlen);
inode->i_blocks = calc_inode_blocks(symlen);
}
err = -ENOMEM;
sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
if (!sym)
goto out;
spin_lock(&ci->i_ceph_lock);
if (!ci->i_symlink)
ci->i_symlink = sym;
else
kfree(sym); /* lost a race */
}
inode->i_link = ci->i_symlink;
break;
case S_IFDIR:
inode->i_op = &ceph_dir_iops;
inode->i_fop = &ceph_dir_fops;
break;
default:
pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
ceph_vinop(inode), inode->i_mode);
}
/* were we issued a capability? */
if (info_caps) {
if (ceph_snap(inode) == CEPH_NOSNAP) {
ceph_add_cap(inode, session,
le64_to_cpu(info->cap.cap_id),
cap_fmode, info_caps,
le32_to_cpu(info->cap.wanted),
le32_to_cpu(info->cap.seq),
le32_to_cpu(info->cap.mseq),
le64_to_cpu(info->cap.realm),
info->cap.flags, &new_cap);
/* set dir completion flag? */
if (S_ISDIR(inode->i_mode) &&
ci->i_files == 0 && ci->i_subdirs == 0 &&
(info_caps & CEPH_CAP_FILE_SHARED) &&
(issued & CEPH_CAP_FILE_EXCL) == 0 &&
!__ceph_dir_is_complete(ci)) {
dout(" marking %p complete (empty)\n", inode);
i_size_write(inode, 0);
__ceph_dir_set_complete(ci,
atomic64_read(&ci->i_release_count),
atomic64_read(&ci->i_ordered_count));
}
wake = true;
} else {
dout(" %p got snap_caps %s\n", inode,
ceph_cap_string(info_caps));
ci->i_snap_caps |= info_caps;
if (cap_fmode >= 0)
__ceph_get_fmode(ci, cap_fmode);
}
} else if (cap_fmode >= 0) {
pr_warn("mds issued no caps on %llx.%llx\n",
ceph_vinop(inode));
__ceph_get_fmode(ci, cap_fmode);
}
if (iinfo->inline_version > 0 &&
iinfo->inline_version >= ci->i_inline_version) {
int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
ci->i_inline_version = iinfo->inline_version;
if (ci->i_inline_version != CEPH_INLINE_NONE &&
(locked_page || (info_caps & cache_caps)))
fill_inline = true;
}
spin_unlock(&ci->i_ceph_lock);
if (fill_inline)
ceph_fill_inline_data(inode, locked_page,
iinfo->inline_data, iinfo->inline_len);
if (wake)
wake_up_all(&ci->i_cap_wq);
/* queue truncate if we saw i_size decrease */
if (queue_trunc)
ceph_queue_vmtruncate(inode);
/* populate frag tree */
if (S_ISDIR(inode->i_mode))
ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
/* update delegation info? */
if (dirinfo)
ceph_fill_dirfrag(inode, dirinfo);
err = 0;
out:
if (new_cap)
ceph_put_cap(mdsc, new_cap);
if (xattr_blob)
ceph_buffer_put(xattr_blob);
ceph_put_string(pool_ns);
return err;
}
/*
* caller should hold session s_mutex.
*/
static void update_dentry_lease(struct dentry *dentry,
struct ceph_mds_reply_lease *lease,
struct ceph_mds_session *session,
unsigned long from_time,
struct ceph_vino *tgt_vino,
struct ceph_vino *dir_vino)
{
struct ceph_dentry_info *di = ceph_dentry(dentry);
long unsigned duration = le32_to_cpu(lease->duration_ms);
long unsigned ttl = from_time + (duration * HZ) / 1000;
long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
struct inode *dir;
struct ceph_mds_session *old_lease_session = NULL;
/*
* Make sure dentry's inode matches tgt_vino. NULL tgt_vino means that
* we expect a negative dentry.
*/
if (!tgt_vino && d_really_is_positive(dentry))
return;
if (tgt_vino && (d_really_is_negative(dentry) ||
!ceph_ino_compare(d_inode(dentry), tgt_vino)))
return;
spin_lock(&dentry->d_lock);
dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
dentry, duration, ttl);
dir = d_inode(dentry->d_parent);
/* make sure parent matches dir_vino */
if (!ceph_ino_compare(dir, dir_vino))
goto out_unlock;
/* only track leases on regular dentries */
if (ceph_snap(dir) != CEPH_NOSNAP)
goto out_unlock;
di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
if (duration == 0) {
__ceph_dentry_dir_lease_touch(di);
goto out_unlock;
}
if (di->lease_gen == session->s_cap_gen &&
time_before(ttl, di->time))
goto out_unlock; /* we already have a newer lease. */
if (di->lease_session && di->lease_session != session) {
old_lease_session = di->lease_session;
di->lease_session = NULL;
}
if (!di->lease_session)
di->lease_session = ceph_get_mds_session(session);
di->lease_gen = session->s_cap_gen;
di->lease_seq = le32_to_cpu(lease->seq);
di->lease_renew_after = half_ttl;
di->lease_renew_from = 0;
di->time = ttl;
__ceph_dentry_lease_touch(di);
out_unlock:
spin_unlock(&dentry->d_lock);
if (old_lease_session)
ceph_put_mds_session(old_lease_session);
}
/*
* splice a dentry to an inode.
* caller must hold directory i_mutex for this to be safe.
*/
static int splice_dentry(struct dentry **pdn, struct inode *in)
{
struct dentry *dn = *pdn;
struct dentry *realdn;
BUG_ON(d_inode(dn));
if (S_ISDIR(in->i_mode)) {
/* If inode is directory, d_splice_alias() below will remove
* 'realdn' from its origin parent. We need to ensure that
* origin parent's readdir cache will not reference 'realdn'
*/
realdn = d_find_any_alias(in);
if (realdn) {
struct ceph_dentry_info *di = ceph_dentry(realdn);
spin_lock(&realdn->d_lock);
realdn->d_op->d_prune(realdn);
di->time = jiffies;
di->lease_shared_gen = 0;
di->offset = 0;
spin_unlock(&realdn->d_lock);
dput(realdn);
}
}
/* dn must be unhashed */
if (!d_unhashed(dn))
d_drop(dn);
realdn = d_splice_alias(in, dn);
if (IS_ERR(realdn)) {
pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
PTR_ERR(realdn), dn, in, ceph_vinop(in));
return PTR_ERR(realdn);
}
if (realdn) {
dout("dn %p (%d) spliced with %p (%d) "
"inode %p ino %llx.%llx\n",
dn, d_count(dn),
realdn, d_count(realdn),
d_inode(realdn), ceph_vinop(d_inode(realdn)));
dput(dn);
*pdn = realdn;
} else {
BUG_ON(!ceph_dentry(dn));
dout("dn %p attached to %p ino %llx.%llx\n",
dn, d_inode(dn), ceph_vinop(d_inode(dn)));
}
return 0;
}
static int d_name_cmp(struct dentry *dentry, const char *name, size_t len)
{
int ret;
/* take d_lock to ensure dentry->d_name stability */
spin_lock(&dentry->d_lock);
ret = dentry->d_name.len - len;
if (!ret)
ret = memcmp(dentry->d_name.name, name, len);
spin_unlock(&dentry->d_lock);
return ret;
}
/*
* Incorporate results into the local cache. This is either just
* one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
* after a lookup).
*
* A reply may contain
* a directory inode along with a dentry.
* and/or a target inode
*
* Called with snap_rwsem (read).
*/
int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
{
struct ceph_mds_session *session = req->r_session;
struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
struct inode *in = NULL;
struct ceph_vino tvino, dvino;
struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
int err = 0;
dout("fill_trace %p is_dentry %d is_target %d\n", req,
rinfo->head->is_dentry, rinfo->head->is_target);
if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
dout("fill_trace reply is empty!\n");
if (rinfo->head->result == 0 && req->r_parent)
ceph_invalidate_dir_request(req);
return 0;
}
if (rinfo->head->is_dentry) {
struct inode *dir = req->r_parent;
if (dir) {
err = fill_inode(dir, NULL,
&rinfo->diri, rinfo->dirfrag,
session, req->r_request_started, -1,
&req->r_caps_reservation);
if (err < 0)
goto done;
} else {
WARN_ON_ONCE(1);
}
if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
struct qstr dname;
struct dentry *dn, *parent;
BUG_ON(!rinfo->head->is_target);
BUG_ON(req->r_dentry);
parent = d_find_any_alias(dir);
BUG_ON(!parent);
dname.name = rinfo->dname;
dname.len = rinfo->dname_len;
dname.hash = full_name_hash(parent, dname.name, dname.len);
tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
retry_lookup:
dn = d_lookup(parent, &dname);
dout("d_lookup on parent=%p name=%.*s got %p\n",
parent, dname.len, dname.name, dn);
if (!dn) {
dn = d_alloc(parent, &dname);
dout("d_alloc %p '%.*s' = %p\n", parent,
dname.len, dname.name, dn);
if (!dn) {
dput(parent);
err = -ENOMEM;
goto done;
}
err = 0;
} else if (d_really_is_positive(dn) &&
(ceph_ino(d_inode(dn)) != tvino.ino ||
ceph_snap(d_inode(dn)) != tvino.snap)) {
dout(" dn %p points to wrong inode %p\n",
dn, d_inode(dn));
ceph_dir_clear_ordered(dir);
d_delete(dn);
dput(dn);
goto retry_lookup;
}
req->r_dentry = dn;
dput(parent);
}
}
if (rinfo->head->is_target) {
tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
in = ceph_get_inode(sb, tvino);
if (IS_ERR(in)) {
err = PTR_ERR(in);
goto done;
}
req->r_target_inode = in;
err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
session, req->r_request_started,
(!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
rinfo->head->result == 0) ? req->r_fmode : -1,
&req->r_caps_reservation);
if (err < 0) {
pr_err("fill_inode badness %p %llx.%llx\n",
in, ceph_vinop(in));
goto done;
}
}
/*
* ignore null lease/binding on snapdir ENOENT, or else we
* will have trouble splicing in the virtual snapdir later
*/
if (rinfo->head->is_dentry &&
!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
(rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
fsc->mount_options->snapdir_name,
req->r_dentry->d_name.len))) {
/*
* lookup link rename : null -> possibly existing inode
* mknod symlink mkdir : null -> new inode
* unlink : linked -> null
*/
struct inode *dir = req->r_parent;
struct dentry *dn = req->r_dentry;
bool have_dir_cap, have_lease;
BUG_ON(!dn);
BUG_ON(!dir);
BUG_ON(d_inode(dn->d_parent) != dir);
dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
BUG_ON(ceph_ino(dir) != dvino.ino);
BUG_ON(ceph_snap(dir) != dvino.snap);
/* do we have a lease on the whole dir? */
have_dir_cap =
(le32_to_cpu(rinfo->diri.in->cap.caps) &
CEPH_CAP_FILE_SHARED);
/* do we have a dn lease? */
have_lease = have_dir_cap ||
le32_to_cpu(rinfo->dlease->duration_ms);
if (!have_lease)
dout("fill_trace no dentry lease or dir cap\n");
/* rename? */
if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
struct inode *olddir = req->r_old_dentry_dir;
BUG_ON(!olddir);
dout(" src %p '%pd' dst %p '%pd'\n",
req->r_old_dentry,
req->r_old_dentry,
dn, dn);
dout("fill_trace doing d_move %p -> %p\n",
req->r_old_dentry, dn);
/* d_move screws up sibling dentries' offsets */
ceph_dir_clear_ordered(dir);
ceph_dir_clear_ordered(olddir);
d_move(req->r_old_dentry, dn);
dout(" src %p '%pd' dst %p '%pd'\n",
req->r_old_dentry,
req->r_old_dentry,
dn, dn);
/* ensure target dentry is invalidated, despite
rehashing bug in vfs_rename_dir */
ceph_invalidate_dentry_lease(dn);
dout("dn %p gets new offset %lld\n", req->r_old_dentry,
ceph_dentry(req->r_old_dentry)->offset);
/* swap r_dentry and r_old_dentry in case that
* splice_dentry() gets called later. This is safe
* because no other place will use them */
req->r_dentry = req->r_old_dentry;
req->r_old_dentry = dn;
dn = req->r_dentry;
}
/* null dentry? */
if (!rinfo->head->is_target) {
dout("fill_trace null dentry\n");
if (d_really_is_positive(dn)) {
dout("d_delete %p\n", dn);
ceph_dir_clear_ordered(dir);
d_delete(dn);
} else if (have_lease) {
if (d_unhashed(dn))
d_add(dn, NULL);
update_dentry_lease(dn, rinfo->dlease,
session,
req->r_request_started,
NULL, &dvino);
}
goto done;
}
/* attach proper inode */
if (d_really_is_negative(dn)) {
ceph_dir_clear_ordered(dir);
ihold(in);
err = splice_dentry(&req->r_dentry, in);
if (err < 0)
goto done;
dn = req->r_dentry; /* may have spliced */
} else if (d_really_is_positive(dn) && d_inode(dn) != in) {
dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
dn, d_inode(dn), ceph_vinop(d_inode(dn)),
ceph_vinop(in));
d_invalidate(dn);
have_lease = false;
}
if (have_lease) {
tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
update_dentry_lease(dn, rinfo->dlease, session,
req->r_request_started,
&tvino, &dvino);
}
dout(" final dn %p\n", dn);
} else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
req->r_op == CEPH_MDS_OP_MKSNAP) &&
!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
struct inode *dir = req->r_parent;
/* fill out a snapdir LOOKUPSNAP dentry */
BUG_ON(!dir);
BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
BUG_ON(!req->r_dentry);
dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
ceph_dir_clear_ordered(dir);
ihold(in);
err = splice_dentry(&req->r_dentry, in);
if (err < 0)
goto done;
} else if (rinfo->head->is_dentry &&
!d_name_cmp(req->r_dentry, rinfo->dname, rinfo->dname_len)) {
struct ceph_vino *ptvino = NULL;
if ((le32_to_cpu(rinfo->diri.in->cap.caps) & CEPH_CAP_FILE_SHARED) ||
le32_to_cpu(rinfo->dlease->duration_ms)) {
dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
if (rinfo->head->is_target) {
tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
ptvino = &tvino;
}
update_dentry_lease(req->r_dentry, rinfo->dlease,
session, req->r_request_started, ptvino,
&dvino);
} else {
dout("%s: no dentry lease or dir cap\n", __func__);
}
}
done:
dout("fill_trace done err=%d\n", err);
return err;
}
/*
* Prepopulate our cache with readdir results, leases, etc.
*/
static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
struct ceph_mds_session *session)
{
struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
int i, err = 0;
for (i = 0; i < rinfo->dir_nr; i++) {
struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
struct ceph_vino vino;
struct inode *in;
int rc;
vino.ino = le64_to_cpu(rde->inode.in->ino);
vino.snap = le64_to_cpu(rde->inode.in->snapid);
in = ceph_get_inode(req->r_dentry->d_sb, vino);
if (IS_ERR(in)) {
err = PTR_ERR(in);
dout("new_inode badness got %d\n", err);
continue;
}
rc = fill_inode(in, NULL, &rde->inode, NULL, session,
req->r_request_started, -1,
&req->r_caps_reservation);
if (rc < 0) {
pr_err("fill_inode badness on %p got %d\n", in, rc);
err = rc;
}
iput(in);
}
return err;
}
void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
{
if (ctl->page) {
kunmap(ctl->page);
put_page(ctl->page);
ctl->page = NULL;
}
}
static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
struct ceph_readdir_cache_control *ctl,
struct ceph_mds_request *req)
{
struct ceph_inode_info *ci = ceph_inode(dir);
unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
unsigned idx = ctl->index % nsize;
pgoff_t pgoff = ctl->index / nsize;
if (!ctl->page || pgoff != page_index(ctl->page)) {
ceph_readdir_cache_release(ctl);
if (idx == 0)
ctl->page = grab_cache_page(&dir->i_data, pgoff);
else
ctl->page = find_lock_page(&dir->i_data, pgoff);
if (!ctl->page) {
ctl->index = -1;
return idx == 0 ? -ENOMEM : 0;
}
/* reading/filling the cache are serialized by
* i_mutex, no need to use page lock */
unlock_page(ctl->page);
ctl->dentries = kmap(ctl->page);
if (idx == 0)
memset(ctl->dentries, 0, PAGE_SIZE);
}
if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
dout("readdir cache dn %p idx %d\n", dn, ctl->index);
ctl->dentries[idx] = dn;
ctl->index++;
} else {
dout("disable readdir cache\n");
ctl->index = -1;
}
return 0;
}
int ceph_readdir_prepopulate(struct ceph_mds_request *req,
struct ceph_mds_session *session)
{
struct dentry *parent = req->r_dentry;
struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
struct qstr dname;
struct dentry *dn;
struct inode *in;
int err = 0, skipped = 0, ret, i;
struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
u32 frag = le32_to_cpu(rhead->args.readdir.frag);
u32 last_hash = 0;
u32 fpos_offset;
struct ceph_readdir_cache_control cache_ctl = {};
if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
return readdir_prepopulate_inodes_only(req, session);
if (rinfo->hash_order) {
if (req->r_path2) {
last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
req->r_path2,
strlen(req->r_path2));
last_hash = ceph_frag_value(last_hash);
} else if (rinfo->offset_hash) {
/* mds understands offset_hash */
WARN_ON_ONCE(req->r_readdir_offset != 2);
last_hash = le32_to_cpu(rhead->args.readdir.offset_hash);
}
}
if (rinfo->dir_dir &&
le32_to_cpu(rinfo->dir_dir->frag) != frag) {
dout("readdir_prepopulate got new frag %x -> %x\n",
frag, le32_to_cpu(rinfo->dir_dir->frag));
frag = le32_to_cpu(rinfo->dir_dir->frag);
if (!rinfo->hash_order)
req->r_readdir_offset = 2;
}
if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
rinfo->dir_nr, parent);
} else {
dout("readdir_prepopulate %d items under dn %p\n",
rinfo->dir_nr, parent);
if (rinfo->dir_dir)
ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
if (ceph_frag_is_leftmost(frag) &&
req->r_readdir_offset == 2 &&
!(rinfo->hash_order && last_hash)) {
/* note dir version at start of readdir so we can
* tell if any dentries get dropped */
req->r_dir_release_cnt =
atomic64_read(&ci->i_release_count);
req->r_dir_ordered_cnt =
atomic64_read(&ci->i_ordered_count);
req->r_readdir_cache_idx = 0;
}
}
cache_ctl.index = req->r_readdir_cache_idx;
fpos_offset = req->r_readdir_offset;
/* FIXME: release caps/leases if error occurs */
for (i = 0; i < rinfo->dir_nr; i++) {
struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
struct ceph_vino tvino, dvino;
dname.name = rde->name;
dname.len = rde->name_len;
dname.hash = full_name_hash(parent, dname.name, dname.len);
tvino.ino = le64_to_cpu(rde->inode.in->ino);
tvino.snap = le64_to_cpu(rde->inode.in->snapid);
if (rinfo->hash_order) {
u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
rde->name, rde->name_len);
hash = ceph_frag_value(hash);
if (hash != last_hash)
fpos_offset = 2;
last_hash = hash;
rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
} else {
rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
}
retry_lookup:
dn = d_lookup(parent, &dname);
dout("d_lookup on parent=%p name=%.*s got %p\n",
parent, dname.len, dname.name, dn);
if (!dn) {
dn = d_alloc(parent, &dname);
dout("d_alloc %p '%.*s' = %p\n", parent,
dname.len, dname.name, dn);
if (!dn) {
dout("d_alloc badness\n");
err = -ENOMEM;
goto out;
}
} else if (d_really_is_positive(dn) &&
(ceph_ino(d_inode(dn)) != tvino.ino ||
ceph_snap(d_inode(dn)) != tvino.snap)) {
struct ceph_dentry_info *di = ceph_dentry(dn);
dout(" dn %p points to wrong inode %p\n",
dn, d_inode(dn));
spin_lock(&dn->d_lock);
if (di->offset > 0 &&
di->lease_shared_gen ==
atomic_read(&ci->i_shared_gen)) {
__ceph_dir_clear_ordered(ci);
di->offset = 0;
}
spin_unlock(&dn->d_lock);
d_delete(dn);
dput(dn);
goto retry_lookup;
}
/* inode */
if (d_really_is_positive(dn)) {
in = d_inode(dn);
} else {
in = ceph_get_inode(parent->d_sb, tvino);
if (IS_ERR(in)) {
dout("new_inode badness\n");
d_drop(dn);
dput(dn);
err = PTR_ERR(in);
goto out;
}
}
ret = fill_inode(in, NULL, &rde->inode, NULL, session,
req->r_request_started, -1,
&req->r_caps_reservation);
if (ret < 0) {
pr_err("fill_inode badness on %p\n", in);
if (d_really_is_negative(dn))
iput(in);
d_drop(dn);
err = ret;
goto next_item;
}
if (d_really_is_negative(dn)) {
if (ceph_security_xattr_deadlock(in)) {
dout(" skip splicing dn %p to inode %p"
" (security xattr deadlock)\n", dn, in);
iput(in);
skipped++;
goto next_item;
}
err = splice_dentry(&dn, in);
if (err < 0)
goto next_item;
}
ceph_dentry(dn)->offset = rde->offset;
dvino = ceph_vino(d_inode(parent));
update_dentry_lease(dn, rde->lease, req->r_session,
req->r_request_started, &tvino, &dvino);
if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
ret = fill_readdir_cache(d_inode(parent), dn,
&cache_ctl, req);
if (ret < 0)
err = ret;
}
next_item:
dput(dn);
}
out:
if (err == 0 && skipped == 0) {
set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
req->r_readdir_cache_idx = cache_ctl.index;
}
ceph_readdir_cache_release(&cache_ctl);
dout("readdir_prepopulate done\n");
return err;
}
bool ceph_inode_set_size(struct inode *inode, loff_t size)
{
struct ceph_inode_info *ci = ceph_inode(inode);
bool ret;
spin_lock(&ci->i_ceph_lock);
dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
i_size_write(inode, size);
inode->i_blocks = calc_inode_blocks(size);
ret = __ceph_should_report_size(ci);
spin_unlock(&ci->i_ceph_lock);
return ret;
}
/*
* Write back inode data in a worker thread. (This can't be done
* in the message handler context.)
*/
void ceph_queue_writeback(struct inode *inode)
{
ihold(inode);
if (queue_work(ceph_inode_to_client(inode)->wb_wq,
&ceph_inode(inode)->i_wb_work)) {
dout("ceph_queue_writeback %p\n", inode);
} else {
dout("ceph_queue_writeback %p failed\n", inode);
iput(inode);
}
}
static void ceph_writeback_work(struct work_struct *work)
{
struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
i_wb_work);
struct inode *inode = &ci->vfs_inode;
dout("writeback %p\n", inode);
filemap_fdatawrite(&inode->i_data);
iput(inode);
}
/*
* queue an async invalidation
*/
void ceph_queue_invalidate(struct inode *inode)
{
ihold(inode);
if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
&ceph_inode(inode)->i_pg_inv_work)) {
dout("ceph_queue_invalidate %p\n", inode);
} else {
dout("ceph_queue_invalidate %p failed\n", inode);
iput(inode);
}
}
/*
* Invalidate inode pages in a worker thread. (This can't be done
* in the message handler context.)
*/
static void ceph_invalidate_work(struct work_struct *work)
{
struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
i_pg_inv_work);
struct inode *inode = &ci->vfs_inode;
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
u32 orig_gen;
int check = 0;
mutex_lock(&ci->i_truncate_mutex);
if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
inode, ceph_ino(inode));
mapping_set_error(inode->i_mapping, -EIO);
truncate_pagecache(inode, 0);
mutex_unlock(&ci->i_truncate_mutex);
goto out;
}
spin_lock(&ci->i_ceph_lock);
dout("invalidate_pages %p gen %d revoking %d\n", inode,
ci->i_rdcache_gen, ci->i_rdcache_revoking);
if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
check = 1;
spin_unlock(&ci->i_ceph_lock);
mutex_unlock(&ci->i_truncate_mutex);
goto out;
}
orig_gen = ci->i_rdcache_gen;
spin_unlock(&ci->i_ceph_lock);
if (invalidate_inode_pages2(inode->i_mapping) < 0) {
pr_err("invalidate_pages %p fails\n", inode);
}
spin_lock(&ci->i_ceph_lock);
if (orig_gen == ci->i_rdcache_gen &&
orig_gen == ci->i_rdcache_revoking) {
dout("invalidate_pages %p gen %d successful\n", inode,
ci->i_rdcache_gen);
ci->i_rdcache_revoking--;
check = 1;
} else {
dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
inode, orig_gen, ci->i_rdcache_gen,
ci->i_rdcache_revoking);
if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
check = 1;
}
spin_unlock(&ci->i_ceph_lock);
mutex_unlock(&ci->i_truncate_mutex);
out:
if (check)
ceph_check_caps(ci, 0, NULL);
iput(inode);
}
/*
* called by trunc_wq;
*
* We also truncate in a separate thread as well.
*/
static void ceph_vmtruncate_work(struct work_struct *work)
{
struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
i_vmtruncate_work);
struct inode *inode = &ci->vfs_inode;
dout("vmtruncate_work %p\n", inode);
__ceph_do_pending_vmtruncate(inode);
iput(inode);
}
/*
* Queue an async vmtruncate. If we fail to queue work, we will handle
* the truncation the next time we call __ceph_do_pending_vmtruncate.
*/
void ceph_queue_vmtruncate(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
ihold(inode);
if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
&ci->i_vmtruncate_work)) {
dout("ceph_queue_vmtruncate %p\n", inode);
} else {
dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
inode, ci->i_truncate_pending);
iput(inode);
}
}
/*
* Make sure any pending truncation is applied before doing anything
* that may depend on it.
*/
void __ceph_do_pending_vmtruncate(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
u64 to;
int wrbuffer_refs, finish = 0;
mutex_lock(&ci->i_truncate_mutex);
retry:
spin_lock(&ci->i_ceph_lock);
if (ci->i_truncate_pending == 0) {
dout("__do_pending_vmtruncate %p none pending\n", inode);
spin_unlock(&ci->i_ceph_lock);
mutex_unlock(&ci->i_truncate_mutex);
return;
}
/*
* make sure any dirty snapped pages are flushed before we
* possibly truncate them.. so write AND block!
*/
if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
spin_unlock(&ci->i_ceph_lock);
dout("__do_pending_vmtruncate %p flushing snaps first\n",
inode);
filemap_write_and_wait_range(&inode->i_data, 0,
inode->i_sb->s_maxbytes);
goto retry;
}
/* there should be no reader or writer */
WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
to = ci->i_truncate_size;
wrbuffer_refs = ci->i_wrbuffer_ref;
dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
ci->i_truncate_pending, to);
spin_unlock(&ci->i_ceph_lock);
truncate_pagecache(inode, to);
spin_lock(&ci->i_ceph_lock);
if (to == ci->i_truncate_size) {
ci->i_truncate_pending = 0;
finish = 1;
}
spin_unlock(&ci->i_ceph_lock);
if (!finish)
goto retry;
mutex_unlock(&ci->i_truncate_mutex);
if (wrbuffer_refs == 0)
ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
wake_up_all(&ci->i_cap_wq);
}
/*
* symlinks
*/
static const struct inode_operations ceph_symlink_iops = {
.get_link = simple_get_link,
.setattr = ceph_setattr,
.getattr = ceph_getattr,
.listxattr = ceph_listxattr,
};
int __ceph_setattr(struct inode *inode, struct iattr *attr)
{
struct ceph_inode_info *ci = ceph_inode(inode);
const unsigned int ia_valid = attr->ia_valid;
struct ceph_mds_request *req;
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
struct ceph_cap_flush *prealloc_cf;
int issued;
int release = 0, dirtied = 0;
int mask = 0;
int err = 0;
int inode_dirty_flags = 0;
bool lock_snap_rwsem = false;
prealloc_cf = ceph_alloc_cap_flush();
if (!prealloc_cf)
return -ENOMEM;
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
USE_AUTH_MDS);
if (IS_ERR(req)) {
ceph_free_cap_flush(prealloc_cf);
return PTR_ERR(req);
}
spin_lock(&ci->i_ceph_lock);
issued = __ceph_caps_issued(ci, NULL);
if (!ci->i_head_snapc &&
(issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
lock_snap_rwsem = true;
if (!down_read_trylock(&mdsc->snap_rwsem)) {
spin_unlock(&ci->i_ceph_lock);
down_read(&mdsc->snap_rwsem);
spin_lock(&ci->i_ceph_lock);
issued = __ceph_caps_issued(ci, NULL);
}
}
dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
if (ia_valid & ATTR_UID) {
dout("setattr %p uid %d -> %d\n", inode,
from_kuid(&init_user_ns, inode->i_uid),
from_kuid(&init_user_ns, attr->ia_uid));
if (issued & CEPH_CAP_AUTH_EXCL) {
inode->i_uid = attr->ia_uid;
dirtied |= CEPH_CAP_AUTH_EXCL;
} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
!uid_eq(attr->ia_uid, inode->i_uid)) {
req->r_args.setattr.uid = cpu_to_le32(
from_kuid(&init_user_ns, attr->ia_uid));
mask |= CEPH_SETATTR_UID;
release |= CEPH_CAP_AUTH_SHARED;
}
}
if (ia_valid & ATTR_GID) {
dout("setattr %p gid %d -> %d\n", inode,
from_kgid(&init_user_ns, inode->i_gid),
from_kgid(&init_user_ns, attr->ia_gid));
if (issued & CEPH_CAP_AUTH_EXCL) {
inode->i_gid = attr->ia_gid;
dirtied |= CEPH_CAP_AUTH_EXCL;
} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
!gid_eq(attr->ia_gid, inode->i_gid)) {
req->r_args.setattr.gid = cpu_to_le32(
from_kgid(&init_user_ns, attr->ia_gid));
mask |= CEPH_SETATTR_GID;
release |= CEPH_CAP_AUTH_SHARED;
}
}
if (ia_valid & ATTR_MODE) {
dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
attr->ia_mode);
if (issued & CEPH_CAP_AUTH_EXCL) {
inode->i_mode = attr->ia_mode;
dirtied |= CEPH_CAP_AUTH_EXCL;
} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
attr->ia_mode != inode->i_mode) {
inode->i_mode = attr->ia_mode;
req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
mask |= CEPH_SETATTR_MODE;
release |= CEPH_CAP_AUTH_SHARED;
}
}
if (ia_valid & ATTR_ATIME) {
dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
if (issued & CEPH_CAP_FILE_EXCL) {
ci->i_time_warp_seq++;
inode->i_atime = attr->ia_atime;
dirtied |= CEPH_CAP_FILE_EXCL;
} else if ((issued & CEPH_CAP_FILE_WR) &&
timespec64_compare(&inode->i_atime,
&attr->ia_atime) < 0) {
inode->i_atime = attr->ia_atime;
dirtied |= CEPH_CAP_FILE_WR;
} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
!timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
ceph_encode_timespec64(&req->r_args.setattr.atime,
&attr->ia_atime);
mask |= CEPH_SETATTR_ATIME;
release |= CEPH_CAP_FILE_SHARED |
CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
}
}
if (ia_valid & ATTR_MTIME) {
dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
if (issued & CEPH_CAP_FILE_EXCL) {
ci->i_time_warp_seq++;
inode->i_mtime = attr->ia_mtime;
dirtied |= CEPH_CAP_FILE_EXCL;
} else if ((issued & CEPH_CAP_FILE_WR) &&
timespec64_compare(&inode->i_mtime,
&attr->ia_mtime) < 0) {
inode->i_mtime = attr->ia_mtime;
dirtied |= CEPH_CAP_FILE_WR;
} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
!timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
ceph_encode_timespec64(&req->r_args.setattr.mtime,
&attr->ia_mtime);
mask |= CEPH_SETATTR_MTIME;
release |= CEPH_CAP_FILE_SHARED |
CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
}
}
if (ia_valid & ATTR_SIZE) {
dout("setattr %p size %lld -> %lld\n", inode,
inode->i_size, attr->ia_size);
if ((issued & CEPH_CAP_FILE_EXCL) &&
attr->ia_size > inode->i_size) {
i_size_write(inode, attr->ia_size);
inode->i_blocks = calc_inode_blocks(attr->ia_size);
ci->i_reported_size = attr->ia_size;
dirtied |= CEPH_CAP_FILE_EXCL;
} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
attr->ia_size != inode->i_size) {
req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
req->r_args.setattr.old_size =
cpu_to_le64(inode->i_size);
mask |= CEPH_SETATTR_SIZE;
release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
}
}
/* these do nothing */
if (ia_valid & ATTR_CTIME) {
bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
only ? "ctime only" : "ignored");
if (only) {
/*
* if kernel wants to dirty ctime but nothing else,
* we need to choose a cap to dirty under, or do
* a almost-no-op setattr
*/
if (issued & CEPH_CAP_AUTH_EXCL)
dirtied |= CEPH_CAP_AUTH_EXCL;
else if (issued & CEPH_CAP_FILE_EXCL)
dirtied |= CEPH_CAP_FILE_EXCL;
else if (issued & CEPH_CAP_XATTR_EXCL)
dirtied |= CEPH_CAP_XATTR_EXCL;
else
mask |= CEPH_SETATTR_CTIME;
}
}
if (ia_valid & ATTR_FILE)
dout("setattr %p ATTR_FILE ... hrm!\n", inode);
if (dirtied) {
inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
&prealloc_cf);
inode->i_ctime = attr->ia_ctime;
}
release &= issued;
spin_unlock(&ci->i_ceph_lock);
if (lock_snap_rwsem)
up_read(&mdsc->snap_rwsem);
if (inode_dirty_flags)
__mark_inode_dirty(inode, inode_dirty_flags);
if (mask) {
req->r_inode = inode;
ihold(inode);
req->r_inode_drop = release;
req->r_args.setattr.mask = cpu_to_le32(mask);
req->r_num_caps = 1;
req->r_stamp = attr->ia_ctime;
err = ceph_mdsc_do_request(mdsc, NULL, req);
}
dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
ceph_cap_string(dirtied), mask);
ceph_mdsc_put_request(req);
ceph_free_cap_flush(prealloc_cf);
if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
__ceph_do_pending_vmtruncate(inode);
return err;
}
/*
* setattr
*/
int ceph_setattr(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = d_inode(dentry);
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
int err;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
err = setattr_prepare(dentry, attr);
if (err != 0)
return err;
if ((attr->ia_valid & ATTR_SIZE) &&
attr->ia_size > max(inode->i_size, fsc->max_file_size))
return -EFBIG;
if ((attr->ia_valid & ATTR_SIZE) &&
ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
return -EDQUOT;
err = __ceph_setattr(inode, attr);
if (err >= 0 && (attr->ia_valid & ATTR_MODE))
err = posix_acl_chmod(inode, attr->ia_mode);
return err;
}
/*
* Verify that we have a lease on the given mask. If not,
* do a getattr against an mds.
*/
int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
int mask, bool force)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
struct ceph_mds_client *mdsc = fsc->mdsc;
struct ceph_mds_request *req;
int mode;
int err;
if (ceph_snap(inode) == CEPH_SNAPDIR) {
dout("do_getattr inode %p SNAPDIR\n", inode);
return 0;
}
dout("do_getattr inode %p mask %s mode 0%o\n",
inode, ceph_cap_string(mask), inode->i_mode);
if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
return 0;
mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS;
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
if (IS_ERR(req))
return PTR_ERR(req);
req->r_inode = inode;
ihold(inode);
req->r_num_caps = 1;
req->r_args.getattr.mask = cpu_to_le32(mask);
req->r_locked_page = locked_page;
err = ceph_mdsc_do_request(mdsc, NULL, req);
if (locked_page && err == 0) {
u64 inline_version = req->r_reply_info.targeti.inline_version;
if (inline_version == 0) {
/* the reply is supposed to contain inline data */
err = -EINVAL;
} else if (inline_version == CEPH_INLINE_NONE) {
err = -ENODATA;
} else {
err = req->r_reply_info.targeti.inline_len;
}
}
ceph_mdsc_put_request(req);
dout("do_getattr result=%d\n", err);
return err;
}
/*
* Check inode permissions. We verify we have a valid value for
* the AUTH cap, then call the generic handler.
*/
int ceph_permission(struct inode *inode, int mask)
{
int err;
if (mask & MAY_NOT_BLOCK)
return -ECHILD;
err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
if (!err)
err = generic_permission(inode, mask);
return err;
}
/*
* Get all attributes. Hopefully somedata we'll have a statlite()
* and can limit the fields we require to be accurate.
*/
int ceph_getattr(const struct path *path, struct kstat *stat,
u32 request_mask, unsigned int flags)
{
struct inode *inode = d_inode(path->dentry);
struct ceph_inode_info *ci = ceph_inode(inode);
int err;
err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
if (!err) {
generic_fillattr(inode, stat);
stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
if (ceph_snap(inode) == CEPH_NOSNAP)
stat->dev = inode->i_sb->s_dev;
else
stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
if (S_ISDIR(inode->i_mode)) {
if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
RBYTES))
stat->size = ci->i_rbytes;
else
stat->size = ci->i_files + ci->i_subdirs;
stat->blocks = 0;
stat->blksize = 65536;
/*
* Some applications rely on the number of st_nlink
* value on directories to be either 0 (if unlinked)
* or 2 + number of subdirectories.
*/
if (stat->nlink == 1)
/* '.' + '..' + subdirs */
stat->nlink = 1 + 1 + ci->i_subdirs;
}
}
return err;
}
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