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mirror_ubuntu-kernels/fs/ceph/inode.c

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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 <linux/iversion.h>
#include <linux/fscrypt.h>
#include "super.h"
#include "mds_client.h"
#include "cache.h"
#include "crypto.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 const struct inode_operations ceph_encrypted_symlink_iops;
static void ceph_inode_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)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
ci->i_vino = *(struct ceph_vino *)data;
inode->i_ino = ceph_vino_to_ino_t(ci->i_vino);
inode_set_iversion_raw(inode, 0);
percpu_counter_inc(&mdsc->metric.total_inodes);
return 0;
}
/**
* ceph_new_inode - allocate a new inode in advance of an expected create
* @dir: parent directory for new inode
* @dentry: dentry that may eventually point to new inode
* @mode: mode of new inode
* @as_ctx: pointer to inherited security context
*
* Allocate a new inode in advance of an operation to create a new inode.
* This allocates the inode and sets up the acl_sec_ctx with appropriate
* info for the new inode.
*
* Returns a pointer to the new inode or an ERR_PTR.
*/
struct inode *ceph_new_inode(struct inode *dir, struct dentry *dentry,
umode_t *mode, struct ceph_acl_sec_ctx *as_ctx)
{
int err;
struct inode *inode;
inode = new_inode(dir->i_sb);
if (!inode)
return ERR_PTR(-ENOMEM);
inode->i_blkbits = CEPH_FSCRYPT_BLOCK_SHIFT;
if (!S_ISLNK(*mode)) {
err = ceph_pre_init_acls(dir, mode, as_ctx);
if (err < 0)
goto out_err;
}
inode->i_state = 0;
inode->i_mode = *mode;
err = ceph_security_init_secctx(dentry, *mode, as_ctx);
if (err < 0)
goto out_err;
/*
* We'll skip setting fscrypt context for snapshots, leaving that for
* the handle_reply().
*/
if (ceph_snap(dir) != CEPH_SNAPDIR) {
err = ceph_fscrypt_prepare_context(dir, inode, as_ctx);
if (err)
goto out_err;
}
return inode;
out_err:
iput(inode);
return ERR_PTR(err);
}
void ceph_as_ctx_to_req(struct ceph_mds_request *req,
struct ceph_acl_sec_ctx *as_ctx)
{
if (as_ctx->pagelist) {
req->r_pagelist = as_ctx->pagelist;
as_ctx->pagelist = NULL;
}
ceph_fscrypt_as_ctx_to_req(req, as_ctx);
}
/**
* ceph_get_inode - find or create/hash a new inode
* @sb: superblock to search and allocate in
* @vino: vino to search for
* @newino: optional new inode to insert if one isn't found (may be NULL)
*
* Search for or insert a new inode into the hash for the given vino, and
* return a reference to it. If new is non-NULL, its reference is consumed.
*/
struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino,
struct inode *newino)
{
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb);
struct ceph_client *cl = mdsc->fsc->client;
struct inode *inode;
if (ceph_vino_is_reserved(vino))
return ERR_PTR(-EREMOTEIO);
if (newino) {
inode = inode_insert5(newino, (unsigned long)vino.ino,
ceph_ino_compare, ceph_set_ino_cb, &vino);
if (inode != newino)
iput(newino);
} else {
inode = iget5_locked(sb, (unsigned long)vino.ino,
ceph_ino_compare, ceph_set_ino_cb, &vino);
}
if (!inode) {
doutc(cl, "no inode found for %llx.%llx\n", vino.ino, vino.snap);
return ERR_PTR(-ENOMEM);
}
doutc(cl, "on %llx=%llx.%llx got %p new %d\n",
ceph_present_inode(inode), ceph_vinop(inode), inode,
!!(inode->i_state & I_NEW));
return inode;
}
/*
* get/constuct snapdir inode for a given directory
*/
struct inode *ceph_get_snapdir(struct inode *parent)
{
struct ceph_client *cl = ceph_inode_to_client(parent);
struct ceph_vino vino = {
.ino = ceph_ino(parent),
.snap = CEPH_SNAPDIR,
};
struct inode *inode = ceph_get_inode(parent->i_sb, vino, NULL);
struct ceph_inode_info *ci = ceph_inode(inode);
int ret = -ENOTDIR;
if (IS_ERR(inode))
return inode;
if (!S_ISDIR(parent->i_mode)) {
pr_warn_once_client(cl, "bad snapdir parent type (mode=0%o)\n",
parent->i_mode);
goto err;
}
if (!(inode->i_state & I_NEW) && !S_ISDIR(inode->i_mode)) {
pr_warn_once_client(cl, "bad snapdir inode type (mode=0%o)\n",
inode->i_mode);
goto err;
}
inode->i_mode = parent->i_mode;
inode->i_uid = parent->i_uid;
inode->i_gid = parent->i_gid;
inode_set_mtime_to_ts(inode, inode_get_mtime(parent));
inode_set_ctime_to_ts(inode, inode_get_ctime(parent));
inode_set_atime_to_ts(inode, inode_get_atime(parent));
ci->i_rbytes = 0;
ci->i_btime = ceph_inode(parent)->i_btime;
#ifdef CONFIG_FS_ENCRYPTION
/* if encrypted, just borrow fscrypt_auth from parent */
if (IS_ENCRYPTED(parent)) {
struct ceph_inode_info *pci = ceph_inode(parent);
ci->fscrypt_auth = kmemdup(pci->fscrypt_auth,
pci->fscrypt_auth_len,
GFP_KERNEL);
if (ci->fscrypt_auth) {
inode->i_flags |= S_ENCRYPTED;
ci->fscrypt_auth_len = pci->fscrypt_auth_len;
} else {
doutc(cl, "Failed to alloc snapdir fscrypt_auth\n");
ret = -ENOMEM;
goto err;
}
}
#endif
if (inode->i_state & I_NEW) {
inode->i_op = &ceph_snapdir_iops;
inode->i_fop = &ceph_snapdir_fops;
ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
unlock_new_inode(inode);
}
return inode;
err:
if ((inode->i_state & I_NEW))
discard_new_inode(inode);
else
iput(inode);
return ERR_PTR(ret);
}
const struct inode_operations ceph_file_iops = {
.permission = ceph_permission,
.setattr = ceph_setattr,
.getattr = ceph_getattr,
.listxattr = ceph_listxattr,
.get_inode_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 inode *inode = &ci->netfs.inode;
struct ceph_client *cl = ceph_inode_to_client(inode);
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);
doutc(cl, "added %p %llx.%llx frag %x\n", inode, ceph_vinop(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)
{
struct ceph_client *cl = ceph_inode_to_client(&ci->netfs.inode);
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;
doutc(cl, "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);
}
doutc(cl, "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_client *cl = ceph_inode_to_client(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 */
doutc(cl, "removed %p %llx.%llx frag %x (no ref)\n",
inode, ceph_vinop(inode), id);
rb_erase(&frag->node, &ci->i_fragtree);
kfree(frag);
} else {
/* tree branch, keep and clear */
doutc(cl, "cleared %p %llx.%llx frag %x referral\n",
inode, 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_client(cl, "ENOMEM on mds ref %p %llx.%llx fg %x\n",
inode, 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]);
doutc(cl, "%p %llx.%llx frag %x ndist=%d\n", inode,
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_client *cl = ceph_inode_to_client(inode);
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 = get_random_u32_below(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);
}
doutc(cl, "%p %llx.%llx\n", inode, 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_client(cl, "%p %llx.%llx invalid split %d/%u, "
"frag %x split by %d\n", inode,
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;
doutc(cl, " 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_fs_client *fsc = ceph_sb_to_fs_client(sb);
struct ceph_inode_info *ci;
int i;
ci = alloc_inode_sb(sb, ceph_inode_cachep, GFP_NOFS);
if (!ci)
return NULL;
doutc(fsc->client, "%p\n", &ci->netfs.inode);
/* Set parameters for the netfs library */
netfs_inode_init(&ci->netfs, &ceph_netfs_ops, false);
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));
memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_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_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;
ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ;
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_truncate_pagecache_size = 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_fx_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_work, ceph_inode_work);
ci->i_work_mask = 0;
memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
#ifdef CONFIG_FS_ENCRYPTION
ci->fscrypt_auth = NULL;
ci->fscrypt_auth_len = 0;
#endif
return &ci->netfs.inode;
}
void ceph_free_inode(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
kfree(ci->i_symlink);
#ifdef CONFIG_FS_ENCRYPTION
kfree(ci->fscrypt_auth);
#endif
fscrypt_free_inode(inode);
kmem_cache_free(ceph_inode_cachep, ci);
}
void ceph_evict_inode(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
struct ceph_client *cl = ceph_inode_to_client(inode);
struct ceph_inode_frag *frag;
struct rb_node *n;
doutc(cl, "%p ino %llx.%llx\n", inode, ceph_vinop(inode));
percpu_counter_dec(&mdsc->metric.total_inodes);
truncate_inode_pages_final(&inode->i_data);
if (inode->i_state & I_PINNING_NETFS_WB)
ceph_fscache_unuse_cookie(inode, true);
clear_inode(inode);
ceph_fscache_unregister_inode_cookie(ci);
fscrypt_put_encryption_info(inode);
__ceph_remove_caps(ci);
if (__ceph_has_quota(ci, QUOTA_GET_ANY))
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) {
if (ceph_snap(inode) == CEPH_NOSNAP) {
doutc(cl, " dropping residual ref to snap realm %p\n",
ci->i_snap_realm);
ceph_change_snap_realm(inode, NULL);
} 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));
ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
}
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_client *cl = ceph_inode_to_client(inode);
struct ceph_inode_info *ci = ceph_inode(inode);
int queue_trunc = 0;
loff_t isize = i_size_read(inode);
if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
(truncate_seq == ci->i_truncate_seq && size > isize)) {
doutc(cl, "size %lld -> %llu\n", isize, size);
if (size > 0 && S_ISDIR(inode->i_mode)) {
pr_err_client(cl, "non-zero size for directory\n");
size = 0;
}
i_size_write(inode, size);
inode->i_blocks = calc_inode_blocks(size);
/*
* If we're expanding, then we should be able to just update
* the existing cookie.
*/
if (size > isize)
ceph_fscache_update(inode);
ci->i_reported_size = size;
if (truncate_seq != ci->i_truncate_seq) {
doutc(cl, "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_RD |
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_is_file_opened(ci)) {
ci->i_truncate_pending++;
queue_trunc = 1;
}
}
}
/*
* It's possible that the new sizes of the two consecutive
* size truncations will be in the same fscrypt last block,
* and we need to truncate the corresponding page caches
* anyway.
*/
if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0) {
doutc(cl, "truncate_size %lld -> %llu, encrypted %d\n",
ci->i_truncate_size, truncate_size,
!!IS_ENCRYPTED(inode));
ci->i_truncate_size = truncate_size;
if (IS_ENCRYPTED(inode)) {
doutc(cl, "truncate_pagecache_size %lld -> %llu\n",
ci->i_truncate_pagecache_size, size);
ci->i_truncate_pagecache_size = size;
} else {
ci->i_truncate_pagecache_size = truncate_size;
}
}
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_client *cl = ceph_inode_to_client(inode);
struct ceph_inode_info *ci = ceph_inode(inode);
struct timespec64 ictime = inode_get_ctime(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, &ictime) > 0) {
doutc(cl, "ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
ictime.tv_sec, ictime.tv_nsec,
ctime->tv_sec, ctime->tv_nsec);
inode_set_ctime_to_ts(inode, *ctime);
}
if (ci->i_version == 0 ||
ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
/* the MDS did a utimes() */
doutc(cl, "mtime %lld.%09ld -> %lld.%09ld tw %d -> %d\n",
inode_get_mtime_sec(inode),
inode_get_mtime_nsec(inode),
mtime->tv_sec, mtime->tv_nsec,
ci->i_time_warp_seq, (int)time_warp_seq);
inode_set_mtime_to_ts(inode, *mtime);
inode_set_atime_to_ts(inode, *atime);
ci->i_time_warp_seq = time_warp_seq;
} else if (time_warp_seq == ci->i_time_warp_seq) {
struct timespec64 ts;
/* nobody did utimes(); take the max */
ts = inode_get_mtime(inode);
if (timespec64_compare(mtime, &ts) > 0) {
doutc(cl, "mtime %lld.%09ld -> %lld.%09ld inc\n",
ts.tv_sec, ts.tv_nsec,
mtime->tv_sec, mtime->tv_nsec);
inode_set_mtime_to_ts(inode, *mtime);
}
ts = inode_get_atime(inode);
if (timespec64_compare(atime, &ts) > 0) {
doutc(cl, "atime %lld.%09ld -> %lld.%09ld inc\n",
ts.tv_sec, ts.tv_nsec,
atime->tv_sec, atime->tv_nsec);
inode_set_atime_to_ts(inode, *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_set_ctime_to_ts(inode, *ctime);
inode_set_mtime_to_ts(inode, *mtime);
inode_set_atime_to_ts(inode, *atime);
ci->i_time_warp_seq = time_warp_seq;
} else {
warn = 1;
}
}
if (warn) /* time_warp_seq shouldn't go backwards */
doutc(cl, "%p mds time_warp_seq %llu < %u\n", inode,
time_warp_seq, ci->i_time_warp_seq);
}
#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
static int decode_encrypted_symlink(struct ceph_mds_client *mdsc,
const char *encsym,
int enclen, u8 **decsym)
{
struct ceph_client *cl = mdsc->fsc->client;
int declen;
u8 *sym;
sym = kmalloc(enclen + 1, GFP_NOFS);
if (!sym)
return -ENOMEM;
declen = ceph_base64_decode(encsym, enclen, sym);
if (declen < 0) {
pr_err_client(cl,
"can't decode symlink (%d). Content: %.*s\n",
declen, enclen, encsym);
kfree(sym);
return -EIO;
}
sym[declen + 1] = '\0';
*decsym = sym;
return declen;
}
#else
static int decode_encrypted_symlink(struct ceph_mds_client *mdsc,
const char *encsym,
int symlen, u8 **decsym)
{
return -EOPNOTSUPP;
}
#endif
/*
* Populate an inode based on info from mds. May be called on new or
* existing inodes.
*/
int ceph_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, int cap_fmode,
struct ceph_cap_reservation *caps_reservation)
{
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
struct ceph_client *cl = mdsc->fsc->client;
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_buffer *old_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;
umode_t mode = le32_to_cpu(info->mode);
dev_t rdev = le32_to_cpu(info->rdev);
lockdep_assert_held(&mdsc->snap_rwsem);
doutc(cl, "%p ino %llx.%llx v %llu had %llu\n", inode, ceph_vinop(inode),
le64_to_cpu(info->version), ci->i_version);
/* Once I_NEW is cleared, we can't change type or dev numbers */
if (inode->i_state & I_NEW) {
inode->i_mode = mode;
} else {
if (inode_wrong_type(inode, mode)) {
pr_warn_once_client(cl,
"inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n",
ceph_vinop(inode), inode->i_mode, mode);
return -ESTALE;
}
if ((S_ISCHR(mode) || S_ISBLK(mode)) && inode->i_rdev != rdev) {
pr_warn_once_client(cl,
"dev inode rdev changed! (ino %llx.%llx is %u:%u, mds says %u:%u)\n",
ceph_vinop(inode), MAJOR(inode->i_rdev),
MINOR(inode->i_rdev), MAJOR(rdev),
MINOR(rdev));
return -ESTALE;
}
}
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);
if (!new_cap)
return -ENOMEM;
}
/*
* 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_client(cl, "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;
/* Update change_attribute */
inode_set_max_iversion_raw(inode, iinfo->change_attr);
__ceph_caps_issued(ci, &issued);
issued |= __ceph_caps_dirty(ci);
new_issued = ~issued & info_caps;
__ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
#ifdef CONFIG_FS_ENCRYPTION
if (iinfo->fscrypt_auth_len &&
((inode->i_state & I_NEW) || (ci->fscrypt_auth_len == 0))) {
kfree(ci->fscrypt_auth);
ci->fscrypt_auth_len = iinfo->fscrypt_auth_len;
ci->fscrypt_auth = iinfo->fscrypt_auth;
iinfo->fscrypt_auth = NULL;
iinfo->fscrypt_auth_len = 0;
inode_set_flags(inode, S_ENCRYPTED, S_ENCRYPTED);
}
#endif
if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
(issued & CEPH_CAP_AUTH_EXCL) == 0) {
inode->i_mode = 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));
doutc(cl, "%p %llx.%llx mode 0%o uid.gid %d.%d\n", inode,
ceph_vinop(inode), inode->i_mode,
from_kuid(&init_user_ns, inode->i_uid),
from_kgid(&init_user_ns, inode->i_gid));
ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
}
/* directories have fl_stripe_unit set to zero */
if (IS_ENCRYPTED(inode))
inode->i_blkbits = CEPH_FSCRYPT_BLOCK_SHIFT;
else if (le32_to_cpu(info->layout.fl_stripe_unit))
inode->i_blkbits =
fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
else
inode->i_blkbits = CEPH_BLOCK_SHIFT;
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))) {
u64 size = le64_to_cpu(info->size);
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;
if (IS_ENCRYPTED(inode) && size &&
iinfo->fscrypt_file_len == sizeof(__le64)) {
u64 fsize = __le64_to_cpu(*(__le64 *)iinfo->fscrypt_file);
if (size == round_up(fsize, CEPH_FSCRYPT_BLOCK_SIZE)) {
size = fsize;
} else {
pr_warn_client(cl,
"fscrypt size mismatch: size=%llu fscrypt_file=%llu, discarding fscrypt_file size.\n",
info->size, size);
}
}
queue_trunc = ceph_fill_file_size(inode, issued,
le32_to_cpu(info->truncate_seq),
le64_to_cpu(info->truncate_size),
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)) {
doutc(cl, "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;
ci->i_rsnaps = iinfo->rsnaps;
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)
old_blob = 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);
ceph_security_invalidate_secctx(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, 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:
if (!ci->i_symlink) {
u32 symlen = iinfo->symlink_len;
char *sym;
spin_unlock(&ci->i_ceph_lock);
if (IS_ENCRYPTED(inode)) {
if (symlen != i_size_read(inode))
pr_err_client(cl,
"%p %llx.%llx BAD symlink size %lld\n",
inode, ceph_vinop(inode),
i_size_read(inode));
err = decode_encrypted_symlink(mdsc, iinfo->symlink,
symlen, (u8 **)&sym);
if (err < 0) {
pr_err_client(cl,
"decoding encrypted symlink failed: %d\n",
err);
goto out;
}
symlen = err;
i_size_write(inode, symlen);
inode->i_blocks = calc_inode_blocks(symlen);
} else {
if (symlen != i_size_read(inode)) {
pr_err_client(cl,
"%p %llx.%llx BAD symlink size %lld\n",
inode, 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 */
}
if (IS_ENCRYPTED(inode)) {
/*
* Encrypted symlinks need to be decrypted before we can
* cache their targets in i_link. Don't touch it here.
*/
inode->i_op = &ceph_encrypted_symlink_iops;
} else {
inode->i_link = ci->i_symlink;
inode->i_op = &ceph_symlink_iops;
}
break;
case S_IFDIR:
inode->i_op = &ceph_dir_iops;
inode->i_fop = &ceph_dir_fops;
break;
default:
pr_err_client(cl, "%p %llx.%llx BAD mode 0%o\n", inode,
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),
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)) {
doutc(cl, " 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 {
doutc(cl, " %p got snap_caps %s\n", inode,
ceph_cap_string(info_caps));
ci->i_snap_caps |= info_caps;
}
}
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 (ceph_has_inline_data(ci) &&
(locked_page || (info_caps & cache_caps)))
fill_inline = true;
}
if (cap_fmode >= 0) {
if (!info_caps)
pr_warn_client(cl, "mds issued no caps on %llx.%llx\n",
ceph_vinop(inode));
__ceph_touch_fmode(ci, mdsc, cap_fmode);
}
spin_unlock(&ci->i_ceph_lock);
ceph_fscache_register_inode_cookie(inode);
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);
ceph_buffer_put(old_blob);
ceph_buffer_put(xattr_blob);
ceph_put_string(pool_ns);
return err;
}
/*
* caller should hold session s_mutex and dentry->d_lock.
*/
static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
struct ceph_mds_reply_lease *lease,
struct ceph_mds_session *session,
unsigned long from_time,
struct ceph_mds_session **old_lease_session)
{
struct ceph_client *cl = ceph_inode_to_client(dir);
struct ceph_dentry_info *di = ceph_dentry(dentry);
unsigned mask = le16_to_cpu(lease->mask);
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;
doutc(cl, "%p duration %lu ms ttl %lu\n", dentry, duration, ttl);
/* only track leases on regular dentries */
if (ceph_snap(dir) != CEPH_NOSNAP)
return;
if (mask & CEPH_LEASE_PRIMARY_LINK)
di->flags |= CEPH_DENTRY_PRIMARY_LINK;
else
di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
if (!(mask & CEPH_LEASE_VALID)) {
__ceph_dentry_dir_lease_touch(di);
return;
}
if (di->lease_gen == atomic_read(&session->s_cap_gen) &&
time_before(ttl, di->time))
return; /* 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 = atomic_read(&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);
}
static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
struct ceph_mds_reply_lease *lease,
struct ceph_mds_session *session,
unsigned long from_time)
{
struct ceph_mds_session *old_lease_session = NULL;
spin_lock(&dentry->d_lock);
__update_dentry_lease(dir, dentry, lease, session, from_time,
&old_lease_session);
spin_unlock(&dentry->d_lock);
ceph_put_mds_session(old_lease_session);
}
/*
* update dentry lease without having parent inode locked
*/
static void update_dentry_lease_careful(struct dentry *dentry,
struct ceph_mds_reply_lease *lease,
struct ceph_mds_session *session,
unsigned long from_time,
char *dname, u32 dname_len,
struct ceph_vino *pdvino,
struct ceph_vino *ptvino)
{
struct inode *dir;
struct ceph_mds_session *old_lease_session = NULL;
spin_lock(&dentry->d_lock);
/* make sure dentry's name matches target */
if (dentry->d_name.len != dname_len ||
memcmp(dentry->d_name.name, dname, dname_len))
goto out_unlock;
dir = d_inode(dentry->d_parent);
/* make sure parent matches dvino */
if (!ceph_ino_compare(dir, pdvino))
goto out_unlock;
/* make sure dentry's inode matches target. NULL ptvino means that
* we expect a negative dentry */
if (ptvino) {
if (d_really_is_negative(dentry))
goto out_unlock;
if (!ceph_ino_compare(d_inode(dentry), ptvino))
goto out_unlock;
} else {
if (d_really_is_positive(dentry))
goto out_unlock;
}
__update_dentry_lease(dir, dentry, lease, session,
from_time, &old_lease_session);
out_unlock:
spin_unlock(&dentry->d_lock);
ceph_put_mds_session(old_lease_session);
}
/*
* splice a dentry to an inode.
* caller must hold directory i_rwsem for this to be safe.
*/
static int splice_dentry(struct dentry **pdn, struct inode *in)
{
struct ceph_client *cl = ceph_inode_to_client(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_client(cl, "error %ld %p inode %p ino %llx.%llx\n",
PTR_ERR(realdn), dn, in, ceph_vinop(in));
return PTR_ERR(realdn);
}
if (realdn) {
doutc(cl, "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));
doutc(cl, "dn %p attached to %p ino %llx.%llx\n", dn,
d_inode(dn), ceph_vinop(d_inode(dn)));
}
return 0;
}
/*
* 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_fs_client(sb);
struct ceph_client *cl = fsc->client;
int err = 0;
doutc(cl, "%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) {
doutc(cl, "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 = ceph_fill_inode(dir, NULL, &rinfo->diri,
rinfo->dirfrag, session, -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)) {
bool is_nokey = false;
struct qstr dname;
struct dentry *dn, *parent;
struct fscrypt_str oname = FSTR_INIT(NULL, 0);
struct ceph_fname fname = { .dir = dir,
.name = rinfo->dname,
.ctext = rinfo->altname,
.name_len = rinfo->dname_len,
.ctext_len = rinfo->altname_len };
BUG_ON(!rinfo->head->is_target);
BUG_ON(req->r_dentry);
parent = d_find_any_alias(dir);
BUG_ON(!parent);
err = ceph_fname_alloc_buffer(dir, &oname);
if (err < 0) {
dput(parent);
goto done;
}
err = ceph_fname_to_usr(&fname, NULL, &oname, &is_nokey);
if (err < 0) {
dput(parent);
ceph_fname_free_buffer(dir, &oname);
goto done;
}
dname.name = oname.name;
dname.len = oname.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);
doutc(cl, "d_lookup on parent=%p name=%.*s got %p\n",
parent, dname.len, dname.name, dn);
if (!dn) {
dn = d_alloc(parent, &dname);
doutc(cl, "d_alloc %p '%.*s' = %p\n", parent,
dname.len, dname.name, dn);
if (!dn) {
dput(parent);
ceph_fname_free_buffer(dir, &oname);
err = -ENOMEM;
goto done;
}
if (is_nokey) {
spin_lock(&dn->d_lock);
dn->d_flags |= DCACHE_NOKEY_NAME;
spin_unlock(&dn->d_lock);
}
err = 0;
} else if (d_really_is_positive(dn) &&
(ceph_ino(d_inode(dn)) != tvino.ino ||
ceph_snap(d_inode(dn)) != tvino.snap)) {
doutc(cl, " 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;
}
ceph_fname_free_buffer(dir, &oname);
req->r_dentry = dn;
dput(parent);
}
}
if (rinfo->head->is_target) {
/* Should be filled in by handle_reply */
BUG_ON(!req->r_target_inode);
in = req->r_target_inode;
err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
NULL, session,
(!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
!test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
rinfo->head->result == 0) ? req->r_fmode : -1,
&req->r_caps_reservation);
if (err < 0) {
pr_err_client(cl, "badness %p %llx.%llx\n", in,
ceph_vinop(in));
req->r_target_inode = NULL;
if (in->i_state & I_NEW)
discard_new_inode(in);
else
iput(in);
goto done;
}
if (in->i_state & I_NEW)
unlock_new_inode(in);
}
/*
* 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)
doutc(cl, "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);
doutc(cl, " src %p '%pd' dst %p '%pd'\n",
req->r_old_dentry, req->r_old_dentry, dn, dn);
doutc(cl, "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);
doutc(cl, " 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);
doutc(cl, "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) {
doutc(cl, "null dentry\n");
if (d_really_is_positive(dn)) {
doutc(cl, "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);
}
if (!d_unhashed(dn) && have_lease)
update_dentry_lease(dir, dn,
rinfo->dlease, session,
req->r_request_started);
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) {
doutc(cl, " %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) {
update_dentry_lease(dir, dn,
rinfo->dlease, session,
req->r_request_started);
}
doutc(cl, " 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_PARENT_LOCKED, &req->r_req_flags) &&
!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);
doutc(cl, " 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 && req->r_dentry) {
/* parent inode is not locked, be carefull */
struct ceph_vino *ptvino = NULL;
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_careful(req->r_dentry, rinfo->dlease,
session, req->r_request_started,
rinfo->dname, rinfo->dname_len,
&dvino, ptvino);
}
done:
doutc(cl, "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;
struct ceph_client *cl = session->s_mdsc->fsc->client;
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, NULL);
if (IS_ERR(in)) {
err = PTR_ERR(in);
doutc(cl, "badness got %d\n", err);
continue;
}
rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
-1, &req->r_caps_reservation);
if (rc < 0) {
pr_err_client(cl, "inode badness on %p got %d\n", in,
rc);
err = rc;
if (in->i_state & I_NEW) {
ihold(in);
discard_new_inode(in);
}
} else if (in->i_state & I_NEW) {
unlock_new_inode(in);
}
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_client *cl = ceph_inode_to_client(dir);
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_rwsem, 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)) {
doutc(cl, "dn %p idx %d\n", dn, ctl->index);
ctl->dentries[idx] = dn;
ctl->index++;
} else {
doutc(cl, "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 inode *inode = d_inode(parent);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
struct ceph_client *cl = session->s_mdsc->fsc->client;
struct qstr dname;
struct dentry *dn;
struct inode *in;
int err = 0, skipped = 0, ret, i;
u32 frag = le32_to_cpu(req->r_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(req->r_args.readdir.offset_hash);
}
}
if (rinfo->dir_dir &&
le32_to_cpu(rinfo->dir_dir->frag) != frag) {
doutc(cl, "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) {
doutc(cl, "%d items under SNAPDIR dn %p\n",
rinfo->dir_nr, parent);
} else {
doutc(cl, "%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;
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_frag_value(rde->raw_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);
doutc(cl, "d_lookup on parent=%p name=%.*s got %p\n",
parent, dname.len, dname.name, dn);
if (!dn) {
dn = d_alloc(parent, &dname);
doutc(cl, "d_alloc %p '%.*s' = %p\n", parent,
dname.len, dname.name, dn);
if (!dn) {
doutc(cl, "d_alloc badness\n");
err = -ENOMEM;
goto out;
}
if (rde->is_nokey) {
spin_lock(&dn->d_lock);
dn->d_flags |= DCACHE_NOKEY_NAME;
spin_unlock(&dn->d_lock);
}
} 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);
doutc(cl, " 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, NULL);
if (IS_ERR(in)) {
doutc(cl, "new_inode badness\n");
d_drop(dn);
dput(dn);
err = PTR_ERR(in);
goto out;
}
}
ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
-1, &req->r_caps_reservation);
if (ret < 0) {
pr_err_client(cl, "badness on %p %llx.%llx\n", in,
ceph_vinop(in));
if (d_really_is_negative(dn)) {
if (in->i_state & I_NEW) {
ihold(in);
discard_new_inode(in);
}
iput(in);
}
d_drop(dn);
err = ret;
goto next_item;
}
if (in->i_state & I_NEW)
unlock_new_inode(in);
if (d_really_is_negative(dn)) {
if (ceph_security_xattr_deadlock(in)) {
doutc(cl, " 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;
update_dentry_lease(d_inode(parent), dn,
rde->lease, req->r_session,
req->r_request_started);
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);
doutc(cl, "done\n");
return err;
}
bool ceph_inode_set_size(struct inode *inode, loff_t size)
{
struct ceph_client *cl = ceph_inode_to_client(inode);
struct ceph_inode_info *ci = ceph_inode(inode);
bool ret;
spin_lock(&ci->i_ceph_lock);
doutc(cl, "set_size %p %llu -> %llu\n", inode, i_size_read(inode), size);
i_size_write(inode, size);
ceph_fscache_update(inode);
inode->i_blocks = calc_inode_blocks(size);
ret = __ceph_should_report_size(ci);
spin_unlock(&ci->i_ceph_lock);
return ret;
}
void ceph_queue_inode_work(struct inode *inode, int work_bit)
{
struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
struct ceph_client *cl = fsc->client;
struct ceph_inode_info *ci = ceph_inode(inode);
set_bit(work_bit, &ci->i_work_mask);
ihold(inode);
if (queue_work(fsc->inode_wq, &ci->i_work)) {
doutc(cl, "%p %llx.%llx mask=%lx\n", inode,
ceph_vinop(inode), ci->i_work_mask);
} else {
doutc(cl, "%p %llx.%llx already queued, mask=%lx\n",
inode, ceph_vinop(inode), ci->i_work_mask);
iput(inode);
}
}
static void ceph_do_invalidate_pages(struct inode *inode)
{
struct ceph_client *cl = ceph_inode_to_client(inode);
struct ceph_inode_info *ci = ceph_inode(inode);
u32 orig_gen;
int check = 0;
ceph_fscache_invalidate(inode, false);
mutex_lock(&ci->i_truncate_mutex);
if (ceph_inode_is_shutdown(inode)) {
pr_warn_ratelimited_client(cl,
"%p %llx.%llx is shut down\n", inode,
ceph_vinop(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);
doutc(cl, "%p %llx.%llx gen %d revoking %d\n", inode,
ceph_vinop(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_client(cl, "invalidate_inode_pages2 %llx.%llx failed\n",
ceph_vinop(inode));
}
spin_lock(&ci->i_ceph_lock);
if (orig_gen == ci->i_rdcache_gen &&
orig_gen == ci->i_rdcache_revoking) {
doutc(cl, "%p %llx.%llx gen %d successful\n", inode,
ceph_vinop(inode), ci->i_rdcache_gen);
ci->i_rdcache_revoking--;
check = 1;
} else {
doutc(cl, "%p %llx.%llx gen %d raced, now %d revoking %d\n",
inode, ceph_vinop(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);
}
/*
* 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_client *cl = ceph_inode_to_client(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) {
doutc(cl, "%p %llx.%llx none pending\n", inode,
ceph_vinop(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);
doutc(cl, "%p %llx.%llx flushing snaps first\n", inode,
ceph_vinop(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_pagecache_size;
wrbuffer_refs = ci->i_wrbuffer_ref;
doutc(cl, "%p %llx.%llx (%d) to %lld\n", inode, ceph_vinop(inode),
ci->i_truncate_pending, to);
spin_unlock(&ci->i_ceph_lock);
ceph_fscache_resize(inode, to);
truncate_pagecache(inode, to);
spin_lock(&ci->i_ceph_lock);
if (to == ci->i_truncate_pagecache_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, 0);
wake_up_all(&ci->i_cap_wq);
}
static void ceph_inode_work(struct work_struct *work)
{
struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
i_work);
struct inode *inode = &ci->netfs.inode;
struct ceph_client *cl = ceph_inode_to_client(inode);
if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
doutc(cl, "writeback %p %llx.%llx\n", inode, ceph_vinop(inode));
filemap_fdatawrite(&inode->i_data);
}
if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
ceph_do_invalidate_pages(inode);
if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
__ceph_do_pending_vmtruncate(inode);
if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask))
ceph_check_caps(ci, 0);
if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask))
ceph_flush_snaps(ci, NULL);
iput(inode);
}
static const char *ceph_encrypted_get_link(struct dentry *dentry,
struct inode *inode,
struct delayed_call *done)
{
struct ceph_inode_info *ci = ceph_inode(inode);
if (!dentry)
return ERR_PTR(-ECHILD);
return fscrypt_get_symlink(inode, ci->i_symlink, i_size_read(inode),
done);
}
static int ceph_encrypted_symlink_getattr(struct mnt_idmap *idmap,
const struct path *path,
struct kstat *stat, u32 request_mask,
unsigned int query_flags)
{
int ret;
ret = ceph_getattr(idmap, path, stat, request_mask, query_flags);
if (ret)
return ret;
return fscrypt_symlink_getattr(path, stat);
}
/*
* symlinks
*/
static const struct inode_operations ceph_symlink_iops = {
.get_link = simple_get_link,
.setattr = ceph_setattr,
.getattr = ceph_getattr,
.listxattr = ceph_listxattr,
};
static const struct inode_operations ceph_encrypted_symlink_iops = {
.get_link = ceph_encrypted_get_link,
.setattr = ceph_setattr,
.getattr = ceph_encrypted_symlink_getattr,
.listxattr = ceph_listxattr,
};
/*
* Transfer the encrypted last block to the MDS and the MDS
* will help update it when truncating a smaller size.
*
* We don't support a PAGE_SIZE that is smaller than the
* CEPH_FSCRYPT_BLOCK_SIZE.
*/
static int fill_fscrypt_truncate(struct inode *inode,
struct ceph_mds_request *req,
struct iattr *attr)
{
struct ceph_client *cl = ceph_inode_to_client(inode);
struct ceph_inode_info *ci = ceph_inode(inode);
int boff = attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE;
loff_t pos, orig_pos = round_down(attr->ia_size,
CEPH_FSCRYPT_BLOCK_SIZE);
u64 block = orig_pos >> CEPH_FSCRYPT_BLOCK_SHIFT;
struct ceph_pagelist *pagelist = NULL;
struct kvec iov = {0};
struct iov_iter iter;
struct page *page = NULL;
struct ceph_fscrypt_truncate_size_header header;
int retry_op = 0;
int len = CEPH_FSCRYPT_BLOCK_SIZE;
loff_t i_size = i_size_read(inode);
int got, ret, issued;
u64 objver;
ret = __ceph_get_caps(inode, NULL, CEPH_CAP_FILE_RD, 0, -1, &got);
if (ret < 0)
return ret;
issued = __ceph_caps_issued(ci, NULL);
doutc(cl, "size %lld -> %lld got cap refs on %s, issued %s\n",
i_size, attr->ia_size, ceph_cap_string(got),
ceph_cap_string(issued));
/* Try to writeback the dirty pagecaches */
if (issued & (CEPH_CAP_FILE_BUFFER)) {
loff_t lend = orig_pos + CEPH_FSCRYPT_BLOCK_SHIFT - 1;
ret = filemap_write_and_wait_range(inode->i_mapping,
orig_pos, lend);
if (ret < 0)
goto out;
}
page = __page_cache_alloc(GFP_KERNEL);
if (page == NULL) {
ret = -ENOMEM;
goto out;
}
pagelist = ceph_pagelist_alloc(GFP_KERNEL);
if (!pagelist) {
ret = -ENOMEM;
goto out;
}
iov.iov_base = kmap_local_page(page);
iov.iov_len = len;
iov_iter_kvec(&iter, READ, &iov, 1, len);
pos = orig_pos;
ret = __ceph_sync_read(inode, &pos, &iter, &retry_op, &objver);
if (ret < 0)
goto out;
/* Insert the header first */
header.ver = 1;
header.compat = 1;
header.change_attr = cpu_to_le64(inode_peek_iversion_raw(inode));
/*
* Always set the block_size to CEPH_FSCRYPT_BLOCK_SIZE,
* because in MDS it may need this to do the truncate.
*/
header.block_size = cpu_to_le32(CEPH_FSCRYPT_BLOCK_SIZE);
/*
* If we hit a hole here, we should just skip filling
* the fscrypt for the request, because once the fscrypt
* is enabled, the file will be split into many blocks
* with the size of CEPH_FSCRYPT_BLOCK_SIZE, if there
* has a hole, the hole size should be multiple of block
* size.
*
* If the Rados object doesn't exist, it will be set to 0.
*/
if (!objver) {
doutc(cl, "hit hole, ppos %lld < size %lld\n", pos, i_size);
header.data_len = cpu_to_le32(8 + 8 + 4);
header.file_offset = 0;
ret = 0;
} else {
header.data_len = cpu_to_le32(8 + 8 + 4 + CEPH_FSCRYPT_BLOCK_SIZE);
header.file_offset = cpu_to_le64(orig_pos);
doutc(cl, "encrypt block boff/bsize %d/%lu\n", boff,
CEPH_FSCRYPT_BLOCK_SIZE);
/* truncate and zero out the extra contents for the last block */
memset(iov.iov_base + boff, 0, PAGE_SIZE - boff);
/* encrypt the last block */
ret = ceph_fscrypt_encrypt_block_inplace(inode, page,
CEPH_FSCRYPT_BLOCK_SIZE,
0, block,
GFP_KERNEL);
if (ret)
goto out;
}
/* Insert the header */
ret = ceph_pagelist_append(pagelist, &header, sizeof(header));
if (ret)
goto out;
if (header.block_size) {
/* Append the last block contents to pagelist */
ret = ceph_pagelist_append(pagelist, iov.iov_base,
CEPH_FSCRYPT_BLOCK_SIZE);
if (ret)
goto out;
}
req->r_pagelist = pagelist;
out:
doutc(cl, "%p %llx.%llx size dropping cap refs on %s\n", inode,
ceph_vinop(inode), ceph_cap_string(got));
ceph_put_cap_refs(ci, got);
if (iov.iov_base)
kunmap_local(iov.iov_base);
if (page)
__free_pages(page, 0);
if (ret && pagelist)
ceph_pagelist_release(pagelist);
return ret;
}
int __ceph_setattr(struct mnt_idmap *idmap, struct inode *inode,
struct iattr *attr, struct ceph_iattr *cia)
{
struct ceph_inode_info *ci = ceph_inode(inode);
unsigned int ia_valid = attr->ia_valid;
struct ceph_mds_request *req;
struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc;
struct ceph_client *cl = ceph_inode_to_client(inode);
struct ceph_cap_flush *prealloc_cf;
loff_t isize = i_size_read(inode);
int issued;
int release = 0, dirtied = 0;
int mask = 0;
int err = 0;
int inode_dirty_flags = 0;
bool lock_snap_rwsem = false;
bool fill_fscrypt;
int truncate_retry = 20; /* The RMW will take around 50ms */
retry:
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);
}
fill_fscrypt = false;
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);
}
}
doutc(cl, "%p %llx.%llx issued %s\n", inode, ceph_vinop(inode),
ceph_cap_string(issued));
#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
if (cia && cia->fscrypt_auth) {
u32 len = ceph_fscrypt_auth_len(cia->fscrypt_auth);
if (len > sizeof(*cia->fscrypt_auth)) {
err = -EINVAL;
spin_unlock(&ci->i_ceph_lock);
goto out;
}
doutc(cl, "%p %llx.%llx fscrypt_auth len %u to %u)\n", inode,
ceph_vinop(inode), ci->fscrypt_auth_len, len);
/* It should never be re-set once set */
WARN_ON_ONCE(ci->fscrypt_auth);
if (issued & CEPH_CAP_AUTH_EXCL) {
dirtied |= CEPH_CAP_AUTH_EXCL;
kfree(ci->fscrypt_auth);
ci->fscrypt_auth = (u8 *)cia->fscrypt_auth;
ci->fscrypt_auth_len = len;
} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
ci->fscrypt_auth_len != len ||
memcmp(ci->fscrypt_auth, cia->fscrypt_auth, len)) {
req->r_fscrypt_auth = cia->fscrypt_auth;
mask |= CEPH_SETATTR_FSCRYPT_AUTH;
release |= CEPH_CAP_AUTH_SHARED;
}
cia->fscrypt_auth = NULL;
}
#else
if (cia && cia->fscrypt_auth) {
err = -EINVAL;
spin_unlock(&ci->i_ceph_lock);
goto out;
}
#endif /* CONFIG_FS_ENCRYPTION */
if (ia_valid & ATTR_UID) {
kuid_t fsuid = from_vfsuid(idmap, i_user_ns(inode), attr->ia_vfsuid);
doutc(cl, "%p %llx.%llx uid %d -> %d\n", inode,
ceph_vinop(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 = fsuid;
dirtied |= CEPH_CAP_AUTH_EXCL;
} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
!uid_eq(fsuid, inode->i_uid)) {
req->r_args.setattr.uid = cpu_to_le32(
from_kuid(&init_user_ns, fsuid));
mask |= CEPH_SETATTR_UID;
release |= CEPH_CAP_AUTH_SHARED;
}
}
if (ia_valid & ATTR_GID) {
kgid_t fsgid = from_vfsgid(idmap, i_user_ns(inode), attr->ia_vfsgid);
doutc(cl, "%p %llx.%llx gid %d -> %d\n", inode,
ceph_vinop(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 = fsgid;
dirtied |= CEPH_CAP_AUTH_EXCL;
} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
!gid_eq(fsgid, inode->i_gid)) {
req->r_args.setattr.gid = cpu_to_le32(
from_kgid(&init_user_ns, fsgid));
mask |= CEPH_SETATTR_GID;
release |= CEPH_CAP_AUTH_SHARED;
}
}
if (ia_valid & ATTR_MODE) {
doutc(cl, "%p %llx.%llx mode 0%o -> 0%o\n", inode,
ceph_vinop(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) {
struct timespec64 atime = inode_get_atime(inode);
doutc(cl, "%p %llx.%llx atime %lld.%09ld -> %lld.%09ld\n",
inode, ceph_vinop(inode),
atime.tv_sec, 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_set_atime_to_ts(inode, attr->ia_atime);
dirtied |= CEPH_CAP_FILE_EXCL;
} else if ((issued & CEPH_CAP_FILE_WR) &&
timespec64_compare(&atime,
&attr->ia_atime) < 0) {
inode_set_atime_to_ts(inode, attr->ia_atime);
dirtied |= CEPH_CAP_FILE_WR;
} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
!timespec64_equal(&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_SIZE) {
doutc(cl, "%p %llx.%llx size %lld -> %lld\n", inode,
ceph_vinop(inode), isize, attr->ia_size);
/*
* Only when the new size is smaller and not aligned to
* CEPH_FSCRYPT_BLOCK_SIZE will the RMW is needed.
*/
if (IS_ENCRYPTED(inode) && attr->ia_size < isize &&
(attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE)) {
mask |= CEPH_SETATTR_SIZE;
release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
mask |= CEPH_SETATTR_FSCRYPT_FILE;
req->r_args.setattr.size =
cpu_to_le64(round_up(attr->ia_size,
CEPH_FSCRYPT_BLOCK_SIZE));
req->r_args.setattr.old_size =
cpu_to_le64(round_up(isize,
CEPH_FSCRYPT_BLOCK_SIZE));
req->r_fscrypt_file = attr->ia_size;
fill_fscrypt = true;
} else if ((issued & CEPH_CAP_FILE_EXCL) && attr->ia_size >= isize) {
if (attr->ia_size > isize) {
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;
ia_valid |= ATTR_MTIME;
}
} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
attr->ia_size != isize) {
mask |= CEPH_SETATTR_SIZE;
release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
if (IS_ENCRYPTED(inode) && attr->ia_size) {
set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
mask |= CEPH_SETATTR_FSCRYPT_FILE;
req->r_args.setattr.size =
cpu_to_le64(round_up(attr->ia_size,
CEPH_FSCRYPT_BLOCK_SIZE));
req->r_args.setattr.old_size =
cpu_to_le64(round_up(isize,
CEPH_FSCRYPT_BLOCK_SIZE));
req->r_fscrypt_file = attr->ia_size;
} else {
req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
req->r_args.setattr.old_size = cpu_to_le64(isize);
req->r_fscrypt_file = 0;
}
}
}
if (ia_valid & ATTR_MTIME) {
struct timespec64 mtime = inode_get_mtime(inode);
doutc(cl, "%p %llx.%llx mtime %lld.%09ld -> %lld.%09ld\n",
inode, ceph_vinop(inode),
mtime.tv_sec, 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_set_mtime_to_ts(inode, attr->ia_mtime);
dirtied |= CEPH_CAP_FILE_EXCL;
} else if ((issued & CEPH_CAP_FILE_WR) &&
timespec64_compare(&mtime, &attr->ia_mtime) < 0) {
inode_set_mtime_to_ts(inode, attr->ia_mtime);
dirtied |= CEPH_CAP_FILE_WR;
} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
!timespec64_equal(&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;
}
}
/* 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;
doutc(cl, "%p %llx.%llx ctime %lld.%09ld -> %lld.%09ld (%s)\n",
inode, ceph_vinop(inode),
inode_get_ctime_sec(inode),
inode_get_ctime_nsec(inode),
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)
doutc(cl, "%p %llx.%llx ATTR_FILE ... hrm!\n", inode,
ceph_vinop(inode));
if (dirtied) {
inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
&prealloc_cf);
inode_set_ctime_to_ts(inode, attr->ia_ctime);
inode_inc_iversion_raw(inode);
}
release &= issued;
spin_unlock(&ci->i_ceph_lock);
if (lock_snap_rwsem) {
up_read(&mdsc->snap_rwsem);
lock_snap_rwsem = false;
}
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;
if (fill_fscrypt) {
err = fill_fscrypt_truncate(inode, req, attr);
if (err)
goto out;
}
/*
* The truncate request will return -EAGAIN when the
* last block has been updated just before the MDS
* successfully gets the xlock for the FILE lock. To
* avoid corrupting the file contents we need to retry
* it.
*/
err = ceph_mdsc_do_request(mdsc, NULL, req);
if (err == -EAGAIN && truncate_retry--) {
doutc(cl, "%p %llx.%llx result=%d (%s locally, %d remote), retry it!\n",
inode, ceph_vinop(inode), err,
ceph_cap_string(dirtied), mask);
ceph_mdsc_put_request(req);
ceph_free_cap_flush(prealloc_cf);
goto retry;
}
}
out:
doutc(cl, "%p %llx.%llx result=%d (%s locally, %d remote)\n", inode,
ceph_vinop(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 mnt_idmap *idmap, struct dentry *dentry,
struct iattr *attr)
{
struct inode *inode = d_inode(dentry);
struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
int err;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
if (ceph_inode_is_shutdown(inode))
return -ESTALE;
err = fscrypt_prepare_setattr(dentry, attr);
if (err)
return err;
err = setattr_prepare(idmap, dentry, attr);
if (err != 0)
return err;
if ((attr->ia_valid & ATTR_SIZE) &&
attr->ia_size > max(i_size_read(inode), 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(idmap, inode, attr, NULL);
if (err >= 0 && (attr->ia_valid & ATTR_MODE))
err = posix_acl_chmod(idmap, dentry, attr->ia_mode);
return err;
}
int ceph_try_to_choose_auth_mds(struct inode *inode, int mask)
{
int issued = ceph_caps_issued(ceph_inode(inode));
/*
* If any 'x' caps is issued we can just choose the auth MDS
* instead of the random replica MDSes. Because only when the
* Locker is in LOCK_EXEC state will the loner client could
* get the 'x' caps. And if we send the getattr requests to
* any replica MDS it must auth pin and tries to rdlock from
* the auth MDS, and then the auth MDS need to do the Locker
* state transition to LOCK_SYNC. And after that the lock state
* will change back.
*
* This cost much when doing the Locker state transition and
* usually will need to revoke caps from clients.
*
* And for the 'Xs' caps for getxattr we will also choose the
* auth MDS, because the MDS side code is buggy due to setxattr
* won't notify the replica MDSes when the values changed and
* the replica MDS will return the old values. Though we will
* fix it in MDS code, but this still makes sense for old ceph.
*/
if (((mask & CEPH_CAP_ANY_SHARED) && (issued & CEPH_CAP_ANY_EXCL))
|| (mask & (CEPH_STAT_RSTAT | CEPH_STAT_CAP_XATTR)))
return USE_AUTH_MDS;
else
return USE_ANY_MDS;
}
/*
* 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_fs_client(inode->i_sb);
struct ceph_client *cl = fsc->client;
struct ceph_mds_client *mdsc = fsc->mdsc;
struct ceph_mds_request *req;
int mode;
int err;
if (ceph_snap(inode) == CEPH_SNAPDIR) {
doutc(cl, "inode %p %llx.%llx SNAPDIR\n", inode,
ceph_vinop(inode));
return 0;
}
doutc(cl, "inode %p %llx.%llx mask %s mode 0%o\n", inode,
ceph_vinop(inode), ceph_cap_string(mask), inode->i_mode);
if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
return 0;
mode = ceph_try_to_choose_auth_mds(inode, mask);
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 ||
inline_version == 1) {
err = -ENODATA;
} else {
err = req->r_reply_info.targeti.inline_len;
}
}
ceph_mdsc_put_request(req);
doutc(cl, "result=%d\n", err);
return err;
}
int ceph_do_getvxattr(struct inode *inode, const char *name, void *value,
size_t size)
{
struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
struct ceph_client *cl = fsc->client;
struct ceph_mds_client *mdsc = fsc->mdsc;
struct ceph_mds_request *req;
int mode = USE_AUTH_MDS;
int err;
char *xattr_value;
size_t xattr_value_len;
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETVXATTR, mode);
if (IS_ERR(req)) {
err = -ENOMEM;
goto out;
}
req->r_feature_needed = CEPHFS_FEATURE_OP_GETVXATTR;
req->r_path2 = kstrdup(name, GFP_NOFS);
if (!req->r_path2) {
err = -ENOMEM;
goto put;
}
ihold(inode);
req->r_inode = inode;
err = ceph_mdsc_do_request(mdsc, NULL, req);
if (err < 0)
goto put;
xattr_value = req->r_reply_info.xattr_info.xattr_value;
xattr_value_len = req->r_reply_info.xattr_info.xattr_value_len;
doutc(cl, "xattr_value_len:%zu, size:%zu\n", xattr_value_len, size);
err = (int)xattr_value_len;
if (size == 0)
goto put;
if (xattr_value_len > size) {
err = -ERANGE;
goto put;
}
memcpy(value, xattr_value, xattr_value_len);
put:
ceph_mdsc_put_request(req);
out:
doutc(cl, "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 mnt_idmap *idmap, 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(idmap, inode, mask);
return err;
}
/* Craft a mask of needed caps given a set of requested statx attrs. */
static int statx_to_caps(u32 want, umode_t mode)
{
int mask = 0;
if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME|STATX_CHANGE_COOKIE))
mask |= CEPH_CAP_AUTH_SHARED;
if (want & (STATX_NLINK|STATX_CTIME|STATX_CHANGE_COOKIE)) {
/*
* The link count for directories depends on inode->i_subdirs,
* and that is only updated when Fs caps are held.
*/
if (S_ISDIR(mode))
mask |= CEPH_CAP_FILE_SHARED;
else
mask |= CEPH_CAP_LINK_SHARED;
}
if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|STATX_BLOCKS|STATX_CHANGE_COOKIE))
mask |= CEPH_CAP_FILE_SHARED;
if (want & (STATX_CTIME|STATX_CHANGE_COOKIE))
mask |= CEPH_CAP_XATTR_SHARED;
return mask;
}
/*
* Get all the attributes. If we have sufficient caps for the requested attrs,
* then we can avoid talking to the MDS at all.
*/
int ceph_getattr(struct mnt_idmap *idmap, const struct path *path,
struct kstat *stat, u32 request_mask, unsigned int flags)
{
struct inode *inode = d_inode(path->dentry);
struct super_block *sb = inode->i_sb;
struct ceph_inode_info *ci = ceph_inode(inode);
u32 valid_mask = STATX_BASIC_STATS;
int err = 0;
if (ceph_inode_is_shutdown(inode))
return -ESTALE;
/* Skip the getattr altogether if we're asked not to sync */
if ((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) {
err = ceph_do_getattr(inode,
statx_to_caps(request_mask, inode->i_mode),
flags & AT_STATX_FORCE_SYNC);
if (err)
return err;
}
generic_fillattr(idmap, request_mask, inode, stat);
stat->ino = ceph_present_inode(inode);
/*
* btime on newly-allocated inodes is 0, so if this is still set to
* that, then assume that it's not valid.
*/
if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
stat->btime = ci->i_btime;
valid_mask |= STATX_BTIME;
}
if (request_mask & STATX_CHANGE_COOKIE) {
stat->change_cookie = inode_peek_iversion_raw(inode);
valid_mask |= STATX_CHANGE_COOKIE;
}
if (ceph_snap(inode) == CEPH_NOSNAP)
stat->dev = 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_fs_client(sb), RBYTES)) {
stat->size = ci->i_rbytes;
} else if (ceph_snap(inode) == CEPH_SNAPDIR) {
struct ceph_inode_info *pci;
struct ceph_snap_realm *realm;
struct inode *parent;
parent = ceph_lookup_inode(sb, ceph_ino(inode));
if (IS_ERR(parent))
return PTR_ERR(parent);
pci = ceph_inode(parent);
spin_lock(&pci->i_ceph_lock);
realm = pci->i_snap_realm;
if (realm)
stat->size = realm->num_snaps;
else
stat->size = 0;
spin_unlock(&pci->i_ceph_lock);
iput(parent);
} 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;
}
stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
if (IS_ENCRYPTED(inode))
stat->attributes |= STATX_ATTR_ENCRYPTED;
stat->attributes_mask |= (STATX_ATTR_CHANGE_MONOTONIC |
STATX_ATTR_ENCRYPTED);
stat->result_mask = request_mask & valid_mask;
return err;
}
void ceph_inode_shutdown(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct rb_node *p;
int iputs = 0;
bool invalidate = false;
spin_lock(&ci->i_ceph_lock);
ci->i_ceph_flags |= CEPH_I_SHUTDOWN;
p = rb_first(&ci->i_caps);
while (p) {
struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
p = rb_next(p);
iputs += ceph_purge_inode_cap(inode, cap, &invalidate);
}
spin_unlock(&ci->i_ceph_lock);
if (invalidate)
ceph_queue_invalidate(inode);
while (iputs--)
iput(inode);
}
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