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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // 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 "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_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;
 }
 
 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
 {
     struct inode *inode;
 
     if (ceph_vino_is_reserved(vino))
         return ERR_PTR(-EREMOTEIO);
 
     inode = iget5_locked(sb, (unsigned long)vino.ino, ceph_ino_compare,
                  ceph_set_ino_cb, &vino);
     if (!inode)
         return ERR_PTR(-ENOMEM);
 
     dout("get_inode on %llu=%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_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);
 
     if (IS_ERR(inode))
         return inode;
 
     if (!S_ISDIR(parent->i_mode)) {
         pr_warn_once("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("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->i_mtime = parent->i_mtime;
     inode->i_ctime = parent->i_ctime;
     inode->i_atime = parent->i_atime;
     ci->i_rbytes = 0;
     ci->i_btime = ceph_inode(parent)->i_btime;
 
     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(-ENOTDIR);
 }
 
 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->netfs.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 = alloc_inode_sb(sb, ceph_inode_cachep, GFP_NOFS);
     if (!ci)
         return NULL;
 
     dout("alloc_inode %p\n", &ci->netfs.inode);
 
     /* Set parameters for the netfs library */
     netfs_inode_init(&ci->netfs, &ceph_netfs_ops);
 
     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_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));
     return &ci->netfs.inode;
 }
 
 void ceph_free_inode(struct inode *inode)
 {
     struct ceph_inode_info *ci = ceph_inode(inode);
 
     kfree(ci->i_symlink);
     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_inode_frag *frag;
     struct rb_node *n;
 
     dout("evict_inode %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_FSCACHE_WB)
         ceph_fscache_unuse_cookie(inode, true);
     clear_inode(inode);
 
     ceph_fscache_unregister_inode_cookie(ci);
 
     __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) {
             dout(" 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_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)) {
         dout("size %lld -> %llu\n", isize, 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);
         /*
          * 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) {
             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_is_file_opened(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;
     }
     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.
  */
 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_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);
 
     dout("%s %p ino %llx.%llx v %llu had %llu\n", __func__,
          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("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("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("%s ENOMEM xattr blob %d bytes\n", __func__,
                    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;
 
     /* directories have fl_stripe_unit set to zero */
     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;
 
     __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 = 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));
         ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
         ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
     }
 
     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;
             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:
         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("%s %llx.%llx BAD symlink "
                     "size %lld\n", __func__,
                     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("%s %llx.%llx BAD mode 0%o\n", __func__,
                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)) {
                 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 (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("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_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;
 
     dout("update_dentry_lease %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 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;
 }
 
 /*
  * 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 = 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)) {
             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) {
         /* 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("ceph_fill_inode 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)
             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);
             }
 
             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) {
             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) {
             update_dentry_lease(dir, dn,
                         rinfo->dlease, session,
                         req->r_request_started);
         }
         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_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);
         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 && 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:
     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 = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
                      -1, &req->r_caps_reservation);
         if (rc < 0) {
             pr_err("ceph_fill_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_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)) {
         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;
     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) {
         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;
 
         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 = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
                       -1, &req->r_caps_reservation);
         if (ret < 0) {
             pr_err("ceph_fill_inode badness on %p\n", 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)) {
                 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;
 
         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);
     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, 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_client(inode);
     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)) {
         dout("queue_inode_work %p, mask=%lx\n", inode, ci->i_work_mask);
     } else {
         dout("queue_inode_work %p already queued, mask=%lx\n",
              inode, ci->i_work_mask);
         iput(inode);
     }
 }
 
 static void ceph_do_invalidate_pages(struct inode *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("%s: inode %llx.%llx is shut down\n",
                     __func__, 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);
     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_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) {
         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);
 }
 
 /*
  * 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);
 
     ceph_fscache_resize(inode, to);
     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, 0, NULL);
 
     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;
 
     if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
         dout("writeback %p\n", 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, NULL);
 
     if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask))
         ceph_flush_snaps(ci, NULL);
 
     iput(inode);
 }
 
 /*
  * 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);
     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_SIZE) {
         loff_t isize = i_size_read(inode);
 
         dout("setattr %p size %lld -> %lld\n", inode, isize, attr->ia_size);
         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) {
             req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
             req->r_args.setattr.old_size = cpu_to_le64(isize);
             mask |= CEPH_SETATTR_SIZE;
             release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
                    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;
         }
     }
 
     /* 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 user_namespace *mnt_userns, 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;
 
     if (ceph_inode_is_shutdown(inode))
         return -ESTALE;
 
     err = setattr_prepare(&init_user_ns, 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(inode, attr);
 
     if (err >= 0 && (attr->ia_valid & ATTR_MODE))
         err = posix_acl_chmod(&init_user_ns, inode, 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_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_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);
     dout("do_getattr 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_client(inode->i_sb);
     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_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;
 
     dout("do_getvxattr 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:
     dout("do_getvxattr 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 user_namespace *mnt_userns, 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(&init_user_ns, 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))
         mask |= CEPH_CAP_AUTH_SHARED;
 
     if (want & (STATX_NLINK|STATX_CTIME)) {
         /*
          * 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))
         mask |= CEPH_CAP_FILE_SHARED;
 
     if (want & (STATX_CTIME))
         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 user_namespace *mnt_userns, 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);
     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(&init_user_ns, 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 (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;
     }
 
     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);
 }