inode.c 56.2 KB
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#include <linux/ceph/ceph_debug.h>
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#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>
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#include <linux/posix_acl.h>
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#include <linux/random.h>
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#include "super.h"
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#include "mds_client.h"
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#include "cache.h"
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#include <linux/ceph/decode.h>
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/*
 * 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;

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static void ceph_invalidate_work(struct work_struct *work);
static void ceph_writeback_work(struct work_struct *work);
static void ceph_vmtruncate_work(struct work_struct *work);
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/*
 * find or create an inode, given the ceph ino number
 */
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static int ceph_set_ino_cb(struct inode *inode, void *data)
{
	ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
	inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
	return 0;
}

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struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
{
	struct inode *inode;
	ino_t t = ceph_vino_to_ino(vino);

	inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
	if (inode == NULL)
		return ERR_PTR(-ENOMEM);
	if (inode->i_state & I_NEW) {
		dout("get_inode created new inode %p %llx.%llx ino %llx\n",
		     inode, ceph_vinop(inode), (u64)inode->i_ino);
		unlock_new_inode(inode);
	}

	dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
	     vino.snap, inode);
	return inode;
}

/*
 * get/constuct snapdir inode for a given directory
 */
struct inode *ceph_get_snapdir(struct inode *parent)
{
	struct ceph_vino vino = {
		.ino = ceph_ino(parent),
		.snap = CEPH_SNAPDIR,
	};
	struct inode *inode = ceph_get_inode(parent->i_sb, vino);
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	struct ceph_inode_info *ci = ceph_inode(inode);
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	BUG_ON(!S_ISDIR(parent->i_mode));
	if (IS_ERR(inode))
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		return inode;
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	inode->i_mode = parent->i_mode;
	inode->i_uid = parent->i_uid;
	inode->i_gid = parent->i_gid;
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	inode->i_op = &ceph_snapdir_iops;
	inode->i_fop = &ceph_snapdir_fops;
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	ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
	ci->i_rbytes = 0;
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	return inode;
}

const struct inode_operations ceph_file_iops = {
	.permission = ceph_permission,
	.setattr = ceph_setattr,
	.getattr = ceph_getattr,
	.setxattr = ceph_setxattr,
	.getxattr = ceph_getxattr,
	.listxattr = ceph_listxattr,
	.removexattr = ceph_removexattr,
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	.get_acl = ceph_get_acl,
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	.set_acl = ceph_set_acl,
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};


/*
 * 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) {
		pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
		       "frag %x\n", &ci->vfs_inode,
		       ceph_vinop(&ci->vfs_inode), f);
		return ERR_PTR(-ENOMEM);
	}
	frag->frag = f;
	frag->split_by = 0;
	frag->mds = -1;
	frag->ndist = 0;

	rb_link_node(&frag->node, parent, p);
	rb_insert_color(&frag->node, &ci->i_fragtree);

	dout("get_or_create_frag added %llx.%llx frag %x\n",
	     ceph_vinop(&ci->vfs_inode), f);
	return frag;
}

/*
 * find a specific frag @f
 */
struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
{
	struct rb_node *n = ci->i_fragtree.rb_node;

	while (n) {
		struct ceph_inode_frag *frag =
			rb_entry(n, struct ceph_inode_frag, node);
		int c = ceph_frag_compare(f, frag->frag);
		if (c < 0)
			n = n->rb_left;
		else if (c > 0)
			n = n->rb_right;
		else
			return frag;
	}
	return NULL;
}

/*
 * Choose frag containing the given value @v.  If @pfrag is
 * specified, copy the frag delegation info to the caller if
 * it is present.
 */
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static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
			      struct ceph_inode_frag *pfrag, int *found)
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{
	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;
}

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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;
}

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/*
 * 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);
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	int diri_auth = -1;
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	int i;
	int err = 0;

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	spin_lock(&ci->i_ceph_lock);
	if (ci->i_auth_cap)
		diri_auth = ci->i_auth_cap->mds;
	spin_unlock(&ci->i_ceph_lock);

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	mutex_lock(&ci->i_fragtree_mutex);
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	if (ndist == 0 && mds == diri_auth) {
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		/* 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;
}

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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;
	struct rb_node *rb_node;
	int i;
	u32 id, nsplits;
	bool update = false;

	mutex_lock(&ci->i_fragtree_mutex);
	nsplits = le32_to_cpu(fragtree->nsplits);
	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;

	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);
		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);
			rb_erase(&frag->node, &ci->i_fragtree);
			kfree(frag);
			frag = NULL;
		}
		if (!frag) {
			frag = __get_or_create_frag(ci, id);
			if (IS_ERR(frag))
				continue;
		}
		frag->split_by = le32_to_cpu(fragtree->splits[i].by);
		dout(" frag %x split by %d\n", frag->frag, frag->split_by);
	}
	while (rb_node) {
		frag = rb_entry(rb_node, struct ceph_inode_frag, node);
		rb_node = rb_next(rb_node);
		rb_erase(&frag->node, &ci->i_fragtree);
		kfree(frag);
	}
out_unlock:
	mutex_unlock(&ci->i_fragtree_mutex);
	return 0;
}
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/*
 * initialize a newly allocated inode.
 */
struct inode *ceph_alloc_inode(struct super_block *sb)
{
	struct ceph_inode_info *ci;
	int i;

	ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
	if (!ci)
		return NULL;

	dout("alloc_inode %p\n", &ci->vfs_inode);

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	spin_lock_init(&ci->i_ceph_lock);

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	ci->i_version = 0;
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	ci->i_inline_version = 0;
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	ci->i_time_warp_seq = 0;
	ci->i_ceph_flags = 0;
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	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);
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	ci->i_symlink = NULL;

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	memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
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	ci->i_pool_ns_len = 0;
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	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);
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	ci->i_prealloc_cap_flush = NULL;
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	ci->i_cap_flush_tree = RB_ROOT;
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	init_waitqueue_head(&ci->i_cap_wq);
	ci->i_hold_caps_min = 0;
	ci->i_hold_caps_max = 0;
	INIT_LIST_HEAD(&ci->i_cap_delay_list);
	INIT_LIST_HEAD(&ci->i_cap_snaps);
	ci->i_head_snapc = NULL;
	ci->i_snap_caps = 0;

	for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
		ci->i_nr_by_mode[i] = 0;

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	mutex_init(&ci->i_truncate_mutex);
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	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;
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	ci->i_wb_ref = 0;
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	ci->i_wrbuffer_ref = 0;
	ci->i_wrbuffer_ref_head = 0;
	ci->i_shared_gen = 0;
	ci->i_rdcache_gen = 0;
	ci->i_rdcache_revoking = 0;

	INIT_LIST_HEAD(&ci->i_unsafe_writes);
	INIT_LIST_HEAD(&ci->i_unsafe_dirops);
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	INIT_LIST_HEAD(&ci->i_unsafe_iops);
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	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);

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	INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
	INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
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	INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);

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	ceph_fscache_inode_init(ci);

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	return &ci->vfs_inode;
}

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static void ceph_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	struct ceph_inode_info *ci = ceph_inode(inode);

	kmem_cache_free(ceph_inode_cachep, ci);
}

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void ceph_destroy_inode(struct inode *inode)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	struct ceph_inode_frag *frag;
	struct rb_node *n;

	dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));

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	ceph_fscache_unregister_inode_cookie(ci);

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	ceph_queue_caps_release(inode);

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	/*
	 * we may still have a snap_realm reference if there are stray
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	 * caps in i_snap_caps.
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	 */
	if (ci->i_snap_realm) {
		struct ceph_mds_client *mdsc =
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			ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
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		struct ceph_snap_realm *realm = ci->i_snap_realm;

		dout(" dropping residual ref to snap realm %p\n", realm);
		spin_lock(&realm->inodes_with_caps_lock);
		list_del_init(&ci->i_snap_realm_item);
		spin_unlock(&realm->inodes_with_caps_lock);
		ceph_put_snap_realm(mdsc, realm);
	}

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	kfree(ci->i_symlink);
	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);
	}

	__ceph_destroy_xattrs(ci);
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	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);
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	call_rcu(&inode->i_rcu, ceph_i_callback);
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}

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int ceph_drop_inode(struct inode *inode)
{
	/*
	 * Positve dentry and corresponding inode are always accompanied
	 * in MDS reply. So no need to keep inode in the cache after
	 * dropping all its aliases.
	 */
	return 1;
}

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/*
 * Helpers to fill in size, ctime, mtime, and atime.  We have to be
 * careful because either the client or MDS may have more up to date
 * info, depending on which capabilities are held, and whether
 * time_warp_seq or truncate_seq have increased.  (Ordinarily, mtime
 * and size are monotonically increasing, except when utimes() or
 * truncate() increments the corresponding _seq values.)
 */
int ceph_fill_file_size(struct inode *inode, int issued,
			u32 truncate_seq, u64 truncate_size, u64 size)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	int queue_trunc = 0;

	if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
	    (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
		dout("size %lld -> %llu\n", inode->i_size, size);
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		i_size_write(inode, size);
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		inode->i_blocks = (size + (1<<9) - 1) >> 9;
		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;
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			/* 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));
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			/*
			 * 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
			 */
Y
Yan, Zheng 已提交
571 572
			if ((issued & (CEPH_CAP_FILE_CACHE|
				       CEPH_CAP_FILE_BUFFER)) ||
573 574
			    mapping_mapped(inode->i_mapping) ||
			    __ceph_caps_file_wanted(ci)) {
S
Sage Weil 已提交
575 576 577 578 579 580 581 582 583 584 585
				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;
	}
586 587 588 589

	if (queue_trunc)
		ceph_fscache_invalidate(inode);

S
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590 591 592 593 594 595 596 597 598 599 600 601
	return queue_trunc;
}

void ceph_fill_file_time(struct inode *inode, int issued,
			 u64 time_warp_seq, struct timespec *ctime,
			 struct timespec *mtime, struct timespec *atime)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	int warn = 0;

	if (issued & (CEPH_CAP_FILE_EXCL|
		      CEPH_CAP_FILE_WR|
S
Sage Weil 已提交
602 603 604
		      CEPH_CAP_FILE_BUFFER|
		      CEPH_CAP_AUTH_EXCL|
		      CEPH_CAP_XATTR_EXCL)) {
S
Sage Weil 已提交
605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643
		if (timespec_compare(ctime, &inode->i_ctime) > 0) {
			dout("ctime %ld.%09ld -> %ld.%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 (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
			/* the MDS did a utimes() */
			dout("mtime %ld.%09ld -> %ld.%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 (timespec_compare(mtime, &inode->i_mtime) > 0) {
				dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
				     inode->i_mtime.tv_sec,
				     inode->i_mtime.tv_nsec,
				     mtime->tv_sec, mtime->tv_nsec);
				inode->i_mtime = *mtime;
			}
			if (timespec_compare(atime, &inode->i_atime) > 0) {
				dout("atime %ld.%09ld -> %ld.%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 {
S
Sage Weil 已提交
644
		/* we have no write|excl caps; whatever the MDS says is true */
S
Sage Weil 已提交
645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662
		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.
 */
663
static int fill_inode(struct inode *inode, struct page *locked_page,
S
Sage Weil 已提交
664 665 666 667 668 669
		      struct ceph_mds_reply_info_in *iinfo,
		      struct ceph_mds_reply_dirfrag *dirinfo,
		      struct ceph_mds_session *session,
		      unsigned long ttl_from, int cap_fmode,
		      struct ceph_cap_reservation *caps_reservation)
{
670
	struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
S
Sage Weil 已提交
671 672
	struct ceph_mds_reply_inode *info = iinfo->in;
	struct ceph_inode_info *ci = ceph_inode(inode);
673
	int issued = 0, implemented, new_issued;
S
Sage Weil 已提交
674 675
	struct timespec mtime, atime, ctime;
	struct ceph_buffer *xattr_blob = NULL;
676
	struct ceph_cap *new_cap = NULL;
S
Sage Weil 已提交
677
	int err = 0;
678
	bool wake = false;
679 680
	bool queue_trunc = false;
	bool new_version = false;
Y
Yan, Zheng 已提交
681
	bool fill_inline = false;
S
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682 683 684 685 686

	dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
	     inode, ceph_vinop(inode), le64_to_cpu(info->version),
	     ci->i_version);

687 688 689 690
	/* prealloc new cap struct */
	if (info->cap.caps && ceph_snap(inode) == CEPH_NOSNAP)
		new_cap = ceph_get_cap(mdsc, caps_reservation);

S
Sage Weil 已提交
691 692 693 694 695 696
	/*
	 * 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) {
S
Sage Weil 已提交
697
		xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
S
Sage Weil 已提交
698 699 700 701 702
		if (!xattr_blob)
			pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
			       iinfo->xattr_len);
	}

703
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
704 705 706

	/*
	 * provided version will be odd if inode value is projected,
707 708 709 710 711 712 713 714
	 * 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
S
Sage Weil 已提交
715
	 */
716 717 718 719 720
	if (ci->i_version == 0 ||
	    ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
	     le64_to_cpu(info->version) > (ci->i_version & ~1)))
		new_version = true;

S
Sage Weil 已提交
721 722
	issued = __ceph_caps_issued(ci, &implemented);
	issued |= implemented | __ceph_caps_dirty(ci);
723
	new_issued = ~issued & le32_to_cpu(info->cap.caps);
S
Sage Weil 已提交
724 725 726 727 728

	/* update inode */
	ci->i_version = le64_to_cpu(info->version);
	inode->i_version++;
	inode->i_rdev = le32_to_cpu(info->rdev);
729
	inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
S
Sage Weil 已提交
730

731 732
	if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
	    (issued & CEPH_CAP_AUTH_EXCL) == 0) {
S
Sage Weil 已提交
733
		inode->i_mode = le32_to_cpu(info->mode);
734 735
		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));
S
Sage Weil 已提交
736
		dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
737 738
		     from_kuid(&init_user_ns, inode->i_uid),
		     from_kgid(&init_user_ns, inode->i_gid));
S
Sage Weil 已提交
739 740
	}

741 742
	if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
	    (issued & CEPH_CAP_LINK_EXCL) == 0)
M
Miklos Szeredi 已提交
743
		set_nlink(inode, le32_to_cpu(info->nlink));
S
Sage Weil 已提交
744

745 746 747 748 749 750 751 752 753 754 755 756
	if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
		/* be careful with mtime, atime, size */
		ceph_decode_timespec(&atime, &info->atime);
		ceph_decode_timespec(&mtime, &info->mtime);
		ceph_decode_timespec(&ctime, &info->ctime);
		ceph_fill_file_time(inode, issued,
				le32_to_cpu(info->time_warp_seq),
				&ctime, &mtime, &atime);
	}

	if (new_version ||
	    (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
757 758
		if (ci->i_layout.fl_pg_pool != info->layout.fl_pg_pool)
			ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
759
		ci->i_layout = info->layout;
760
		ci->i_pool_ns_len = iinfo->pool_ns_len;
761

762 763 764 765 766 767 768 769 770 771 772 773
		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);
		}
	}
S
Sage Weil 已提交
774 775 776

	/* xattrs */
	/* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
777
	if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
S
Sage Weil 已提交
778 779 780 781 782 783 784 785
	    le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
		if (ci->i_xattrs.blob)
			ceph_buffer_put(ci->i_xattrs.blob);
		ci->i_xattrs.blob = xattr_blob;
		if (xattr_blob)
			memcpy(ci->i_xattrs.blob->vec.iov_base,
			       iinfo->xattr_data, iinfo->xattr_len);
		ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
G
Guangliang Zhao 已提交
786
		ceph_forget_all_cached_acls(inode);
787
		xattr_blob = NULL;
S
Sage Weil 已提交
788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806
	}

	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:
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
		inode->i_op = &ceph_file_iops;
		break;
	case S_IFREG:
		inode->i_op = &ceph_file_iops;
		inode->i_fop = &ceph_file_fops;
		break;
	case S_IFLNK:
		inode->i_op = &ceph_symlink_iops;
		if (!ci->i_symlink) {
807
			u32 symlen = iinfo->symlink_len;
S
Sage Weil 已提交
808 809
			char *sym;

810
			spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
811

812
			err = -EINVAL;
813
			if (WARN_ON(symlen != i_size_read(inode)))
814 815
				goto out;

S
Sage Weil 已提交
816
			err = -ENOMEM;
817
			sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
S
Sage Weil 已提交
818 819 820
			if (!sym)
				goto out;

821
			spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
822 823 824 825 826
			if (!ci->i_symlink)
				ci->i_symlink = sym;
			else
				kfree(sym); /* lost a race */
		}
A
Al Viro 已提交
827
		inode->i_link = ci->i_symlink;
S
Sage Weil 已提交
828 829 830 831 832
		break;
	case S_IFDIR:
		inode->i_op = &ceph_dir_iops;
		inode->i_fop = &ceph_dir_fops;

833 834
		ci->i_dir_layout = iinfo->dir_layout;

S
Sage Weil 已提交
835 836 837 838 839 840 841 842 843 844 845 846 847 848 849
		ci->i_files = le64_to_cpu(info->files);
		ci->i_subdirs = le64_to_cpu(info->subdirs);
		ci->i_rbytes = le64_to_cpu(info->rbytes);
		ci->i_rfiles = le64_to_cpu(info->rfiles);
		ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
		ceph_decode_timespec(&ci->i_rctime, &info->rctime);
		break;
	default:
		pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
		       ceph_vinop(inode), inode->i_mode);
	}

	/* were we issued a capability? */
	if (info->cap.caps) {
		if (ceph_snap(inode) == CEPH_NOSNAP) {
850
			unsigned caps = le32_to_cpu(info->cap.caps);
S
Sage Weil 已提交
851 852
			ceph_add_cap(inode, session,
				     le64_to_cpu(info->cap.cap_id),
853
				     cap_fmode, caps,
S
Sage Weil 已提交
854 855 856 857
				     le32_to_cpu(info->cap.wanted),
				     le32_to_cpu(info->cap.seq),
				     le32_to_cpu(info->cap.mseq),
				     le64_to_cpu(info->cap.realm),
858
				     info->cap.flags, &new_cap);
859 860 861 862 863 864 865 866

			/* set dir completion flag? */
			if (S_ISDIR(inode->i_mode) &&
			    ci->i_files == 0 && ci->i_subdirs == 0 &&
			    (caps & CEPH_CAP_FILE_SHARED) &&
			    (issued & CEPH_CAP_FILE_EXCL) == 0 &&
			    !__ceph_dir_is_complete(ci)) {
				dout(" marking %p complete (empty)\n", inode);
Y
Yan, Zheng 已提交
867
				i_size_write(inode, 0);
868
				__ceph_dir_set_complete(ci,
Y
Yan, Zheng 已提交
869 870
					atomic64_read(&ci->i_release_count),
					atomic64_read(&ci->i_ordered_count));
871 872
			}

873
			wake = true;
S
Sage Weil 已提交
874 875 876 877 878 879 880
		} else {
			dout(" %p got snap_caps %s\n", inode,
			     ceph_cap_string(le32_to_cpu(info->cap.caps)));
			ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
			if (cap_fmode >= 0)
				__ceph_get_fmode(ci, cap_fmode);
		}
881
	} else if (cap_fmode >= 0) {
882
		pr_warn("mds issued no caps on %llx.%llx\n",
883 884
			   ceph_vinop(inode));
		__ceph_get_fmode(ci, cap_fmode);
S
Sage Weil 已提交
885
	}
Y
Yan, Zheng 已提交
886 887 888 889 890 891

	if (iinfo->inline_version > 0 &&
	    iinfo->inline_version >= ci->i_inline_version) {
		int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
		ci->i_inline_version = iinfo->inline_version;
		if (ci->i_inline_version != CEPH_INLINE_NONE &&
892 893
		    (locked_page ||
		     (le32_to_cpu(info->cap.caps) & cache_caps)))
Y
Yan, Zheng 已提交
894 895 896
			fill_inline = true;
	}

897
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
898

Y
Yan, Zheng 已提交
899
	if (fill_inline)
900
		ceph_fill_inline_data(inode, locked_page,
Y
Yan, Zheng 已提交
901 902
				      iinfo->inline_data, iinfo->inline_len);

903 904 905
	if (wake)
		wake_up_all(&ci->i_cap_wq);

S
Sage Weil 已提交
906 907
	/* queue truncate if we saw i_size decrease */
	if (queue_trunc)
908
		ceph_queue_vmtruncate(inode);
S
Sage Weil 已提交
909 910

	/* populate frag tree */
911 912
	if (S_ISDIR(inode->i_mode))
		ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
S
Sage Weil 已提交
913 914 915 916 917 918 919

	/* update delegation info? */
	if (dirinfo)
		ceph_fill_dirfrag(inode, dirinfo);

	err = 0;
out:
920 921
	if (new_cap)
		ceph_put_cap(mdsc, new_cap);
S
Sage Weil 已提交
922 923
	if (xattr_blob)
		ceph_buffer_put(xattr_blob);
S
Sage Weil 已提交
924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945
	return err;
}

/*
 * caller should hold session s_mutex.
 */
static void update_dentry_lease(struct dentry *dentry,
				struct ceph_mds_reply_lease *lease,
				struct ceph_mds_session *session,
				unsigned long from_time)
{
	struct ceph_dentry_info *di = ceph_dentry(dentry);
	long unsigned duration = le32_to_cpu(lease->duration_ms);
	long unsigned ttl = from_time + (duration * HZ) / 1000;
	long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
	struct inode *dir;

	/* only track leases on regular dentries */
	if (dentry->d_op != &ceph_dentry_ops)
		return;

	spin_lock(&dentry->d_lock);
S
Sage Weil 已提交
946 947
	dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
	     dentry, duration, ttl);
S
Sage Weil 已提交
948 949

	/* make lease_rdcache_gen match directory */
950
	dir = d_inode(dentry->d_parent);
S
Sage Weil 已提交
951 952
	di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;

S
Sage Weil 已提交
953
	if (duration == 0)
S
Sage Weil 已提交
954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980
		goto out_unlock;

	if (di->lease_gen == session->s_cap_gen &&
	    time_before(ttl, dentry->d_time))
		goto out_unlock;  /* we already have a newer lease. */

	if (di->lease_session && di->lease_session != session)
		goto out_unlock;

	ceph_dentry_lru_touch(dentry);

	if (!di->lease_session)
		di->lease_session = ceph_get_mds_session(session);
	di->lease_gen = session->s_cap_gen;
	di->lease_seq = le32_to_cpu(lease->seq);
	di->lease_renew_after = half_ttl;
	di->lease_renew_from = 0;
	dentry->d_time = ttl;
out_unlock:
	spin_unlock(&dentry->d_lock);
	return;
}

/*
 * splice a dentry to an inode.
 * caller must hold directory i_mutex for this to be safe.
 */
981
static struct dentry *splice_dentry(struct dentry *dn, struct inode *in)
S
Sage Weil 已提交
982 983 984
{
	struct dentry *realdn;

985
	BUG_ON(d_inode(dn));
S
Sage Weil 已提交
986

S
Sage Weil 已提交
987 988 989
	/* dn must be unhashed */
	if (!d_unhashed(dn))
		d_drop(dn);
990
	realdn = d_splice_alias(in, dn);
S
Sage Weil 已提交
991
	if (IS_ERR(realdn)) {
992 993
		pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
		       PTR_ERR(realdn), dn, in, ceph_vinop(in));
S
Sage Weil 已提交
994 995 996 997 998
		dn = realdn; /* note realdn contains the error */
		goto out;
	} else if (realdn) {
		dout("dn %p (%d) spliced with %p (%d) "
		     "inode %p ino %llx.%llx\n",
A
Al Viro 已提交
999 1000
		     dn, d_count(dn),
		     realdn, d_count(realdn),
1001
		     d_inode(realdn), ceph_vinop(d_inode(realdn)));
S
Sage Weil 已提交
1002 1003 1004 1005 1006
		dput(dn);
		dn = realdn;
	} else {
		BUG_ON(!ceph_dentry(dn));
		dout("dn %p attached to %p ino %llx.%llx\n",
1007
		     dn, d_inode(dn), ceph_vinop(d_inode(dn)));
S
Sage Weil 已提交
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
	}
out:
	return dn;
}

/*
 * 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)
{
	struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
	struct inode *in = NULL;
	struct ceph_vino vino;
1030
	struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
S
Sage Weil 已提交
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071
	int err = 0;

	dout("fill_trace %p is_dentry %d is_target %d\n", req,
	     rinfo->head->is_dentry, rinfo->head->is_target);

#if 0
	/*
	 * Debugging hook:
	 *
	 * If we resend completed ops to a recovering mds, we get no
	 * trace.  Since that is very rare, pretend this is the case
	 * to ensure the 'no trace' handlers in the callers behave.
	 *
	 * Fill in inodes unconditionally to avoid breaking cap
	 * invariants.
	 */
	if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
		pr_info("fill_trace faking empty trace on %lld %s\n",
			req->r_tid, ceph_mds_op_name(rinfo->head->op));
		if (rinfo->head->is_dentry) {
			rinfo->head->is_dentry = 0;
			err = fill_inode(req->r_locked_dir,
					 &rinfo->diri, rinfo->dirfrag,
					 session, req->r_request_started, -1);
		}
		if (rinfo->head->is_target) {
			rinfo->head->is_target = 0;
			ininfo = rinfo->targeti.in;
			vino.ino = le64_to_cpu(ininfo->ino);
			vino.snap = le64_to_cpu(ininfo->snapid);
			in = ceph_get_inode(sb, vino);
			err = fill_inode(in, &rinfo->targeti, NULL,
					 session, req->r_request_started,
					 req->r_fmode);
			iput(in);
		}
	}
#endif

	if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
		dout("fill_trace reply is empty!\n");
1072 1073
		if (rinfo->head->result == 0 && req->r_locked_dir)
			ceph_invalidate_dir_request(req);
S
Sage Weil 已提交
1074 1075 1076 1077
		return 0;
	}

	if (rinfo->head->is_dentry) {
1078 1079
		struct inode *dir = req->r_locked_dir;

1080
		if (dir) {
1081 1082
			err = fill_inode(dir, NULL,
					 &rinfo->diri, rinfo->dirfrag,
1083 1084 1085
					 session, req->r_request_started, -1,
					 &req->r_caps_reservation);
			if (err < 0)
1086
				goto done;
1087 1088 1089
		} else {
			WARN_ON_ONCE(1);
		}
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125

		if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
			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(dname.name, dname.len);
			vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
			vino.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 == NULL) {
					dput(parent);
					err = -ENOMEM;
					goto done;
				}
				err = ceph_init_dentry(dn);
				if (err < 0) {
					dput(dn);
					dput(parent);
					goto done;
				}
1126 1127 1128
			} else if (d_really_is_positive(dn) &&
				   (ceph_ino(d_inode(dn)) != vino.ino ||
				    ceph_snap(d_inode(dn)) != vino.snap)) {
1129
				dout(" dn %p points to wrong inode %p\n",
1130
				     dn, d_inode(dn));
1131 1132 1133 1134 1135 1136 1137 1138
				d_delete(dn);
				dput(dn);
				goto retry_lookup;
			}

			req->r_dentry = dn;
			dput(parent);
		}
1139 1140
	}

1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
	if (rinfo->head->is_target) {
		vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
		vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);

		in = ceph_get_inode(sb, vino);
		if (IS_ERR(in)) {
			err = PTR_ERR(in);
			goto done;
		}
		req->r_target_inode = in;

1152
		err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1153
				session, req->r_request_started,
1154
				(!req->r_aborted && rinfo->head->result == 0) ?
1155 1156 1157 1158 1159 1160 1161 1162 1163
				req->r_fmode : -1,
				&req->r_caps_reservation);
		if (err < 0) {
			pr_err("fill_inode badness %p %llx.%llx\n",
				in, ceph_vinop(in));
			goto done;
		}
	}

1164 1165 1166 1167 1168
	/*
	 * ignore null lease/binding on snapdir ENOENT, or else we
	 * will have trouble splicing in the virtual snapdir later
	 */
	if (rinfo->head->is_dentry && !req->r_aborted &&
1169
	    req->r_locked_dir &&
1170
	    (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1171
					       fsc->mount_options->snapdir_name,
1172
					       req->r_dentry->d_name.len))) {
S
Sage Weil 已提交
1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
		/*
		 * lookup link rename   : null -> possibly existing inode
		 * mknod symlink mkdir  : null -> new inode
		 * unlink               : linked -> null
		 */
		struct inode *dir = req->r_locked_dir;
		struct dentry *dn = req->r_dentry;
		bool have_dir_cap, have_lease;

		BUG_ON(!dn);
		BUG_ON(!dir);
1184
		BUG_ON(d_inode(dn->d_parent) != dir);
S
Sage Weil 已提交
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
		BUG_ON(ceph_ino(dir) !=
		       le64_to_cpu(rinfo->diri.in->ino));
		BUG_ON(ceph_snap(dir) !=
		       le64_to_cpu(rinfo->diri.in->snapid));

		/* 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 ||
S
Sage Weil 已提交
1197
			le32_to_cpu(rinfo->dlease->duration_ms);
S
Sage Weil 已提交
1198 1199 1200 1201 1202
		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) {
1203 1204 1205
			struct inode *olddir = req->r_old_dentry_dir;
			BUG_ON(!olddir);

A
Al Viro 已提交
1206
			dout(" src %p '%pd' dst %p '%pd'\n",
S
Sage Weil 已提交
1207
			     req->r_old_dentry,
A
Al Viro 已提交
1208 1209
			     req->r_old_dentry,
			     dn, dn);
S
Sage Weil 已提交
1210 1211
			dout("fill_trace doing d_move %p -> %p\n",
			     req->r_old_dentry, dn);
S
Sage Weil 已提交
1212

Y
Yan, Zheng 已提交
1213 1214 1215 1216
			/* d_move screws up sibling dentries' offsets */
			ceph_dir_clear_ordered(dir);
			ceph_dir_clear_ordered(olddir);

S
Sage Weil 已提交
1217
			d_move(req->r_old_dentry, dn);
A
Al Viro 已提交
1218 1219
			dout(" src %p '%pd' dst %p '%pd'\n",
			     req->r_old_dentry,
S
Sage Weil 已提交
1220
			     req->r_old_dentry,
A
Al Viro 已提交
1221
			     dn, dn);
1222

1223 1224
			/* ensure target dentry is invalidated, despite
			   rehashing bug in vfs_rename_dir */
1225 1226
			ceph_invalidate_dentry_lease(dn);

1227
			dout("dn %p gets new offset %lld\n", req->r_old_dentry,
S
Sage Weil 已提交
1228
			     ceph_dentry(req->r_old_dentry)->offset);
1229

S
Sage Weil 已提交
1230 1231 1232 1233 1234 1235
			dn = req->r_old_dentry;  /* use old_dentry */
		}

		/* null dentry? */
		if (!rinfo->head->is_target) {
			dout("fill_trace null dentry\n");
1236
			if (d_really_is_positive(dn)) {
1237
				ceph_dir_clear_ordered(dir);
S
Sage Weil 已提交
1238 1239 1240 1241
				dout("d_delete %p\n", dn);
				d_delete(dn);
			} else {
				if (have_lease && d_unhashed(dn))
1242
					d_add(dn, NULL);
S
Sage Weil 已提交
1243 1244 1245 1246 1247 1248 1249 1250
				update_dentry_lease(dn, rinfo->dlease,
						    session,
						    req->r_request_started);
			}
			goto done;
		}

		/* attach proper inode */
1251
		if (d_really_is_negative(dn)) {
1252
			ceph_dir_clear_ordered(dir);
1253
			ihold(in);
1254
			dn = splice_dentry(dn, in);
S
Sage Weil 已提交
1255 1256 1257 1258 1259
			if (IS_ERR(dn)) {
				err = PTR_ERR(dn);
				goto done;
			}
			req->r_dentry = dn;  /* may have spliced */
1260
		} else if (d_really_is_positive(dn) && d_inode(dn) != in) {
S
Sage Weil 已提交
1261
			dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1262
			     dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1263
			     ceph_vinop(in));
S
Sage Weil 已提交
1264 1265 1266 1267 1268 1269 1270
			have_lease = false;
		}

		if (have_lease)
			update_dentry_lease(dn, rinfo->dlease, session,
					    req->r_request_started);
		dout(" final dn %p\n", dn);
1271 1272 1273
	} else if (!req->r_aborted &&
		   (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
		    req->r_op == CEPH_MDS_OP_MKSNAP)) {
S
Sage Weil 已提交
1274
		struct dentry *dn = req->r_dentry;
1275
		struct inode *dir = req->r_locked_dir;
S
Sage Weil 已提交
1276 1277 1278

		/* fill out a snapdir LOOKUPSNAP dentry */
		BUG_ON(!dn);
1279 1280
		BUG_ON(!dir);
		BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
S
Sage Weil 已提交
1281
		dout(" linking snapped dir %p to dn %p\n", in, dn);
1282
		ceph_dir_clear_ordered(dir);
1283
		ihold(in);
1284
		dn = splice_dentry(dn, in);
S
Sage Weil 已提交
1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
		if (IS_ERR(dn)) {
			err = PTR_ERR(dn);
			goto done;
		}
		req->r_dentry = dn;  /* may have spliced */
	}
done:
	dout("fill_trace done err=%d\n", err);
	return err;
}

/*
 * Prepopulate our cache with readdir results, leases, etc.
 */
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318
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_vino vino;
		struct inode *in;
		int rc;

		vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
		vino.snap = le64_to_cpu(rinfo->dir_in[i].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;
		}
1319
		rc = fill_inode(in, NULL, &rinfo->dir_in[i], NULL, session,
1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
				req->r_request_started, -1,
				&req->r_caps_reservation);
		if (rc < 0) {
			pr_err("fill_inode badness on %p got %d\n", in, rc);
			err = rc;
			continue;
		}
	}

	return err;
}

Y
Yan, Zheng 已提交
1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374
void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
{
	if (ctl->page) {
		kunmap(ctl->page);
		page_cache_release(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_CACHE_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);
		ctl->page  = grab_cache_page(&dir->i_data, pgoff);
		if (!ctl->page) {
			ctl->index = -1;
			return -ENOMEM;
		}
		/* reading/filling the cache are serialized by
		 * i_mutex, no need to use page lock */
		unlock_page(ctl->page);
		ctl->dentries = kmap(ctl->page);
	}

	if (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;
}

S
Sage Weil 已提交
1375 1376 1377 1378 1379 1380 1381 1382
int ceph_readdir_prepopulate(struct ceph_mds_request *req,
			     struct ceph_mds_session *session)
{
	struct dentry *parent = req->r_dentry;
	struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
	struct qstr dname;
	struct dentry *dn;
	struct inode *in;
1383
	int err = 0, ret, i;
S
Sage Weil 已提交
1384 1385 1386
	struct inode *snapdir = NULL;
	struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
	struct ceph_dentry_info *di;
1387
	u32 frag = le32_to_cpu(rhead->args.readdir.frag);
Y
Yan, Zheng 已提交
1388 1389 1390 1391
	struct ceph_readdir_cache_control cache_ctl = {};

	if (req->r_aborted)
		return readdir_prepopulate_inodes_only(req, session);
1392 1393 1394 1395 1396 1397 1398

	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 (ceph_frag_is_leftmost(frag))
Y
Yan, Zheng 已提交
1399
			req->r_readdir_offset = 2;
1400
		else
Y
Yan, Zheng 已提交
1401
			req->r_readdir_offset = 0;
1402
	}
S
Sage Weil 已提交
1403 1404

	if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1405
		snapdir = ceph_get_snapdir(d_inode(parent));
S
Sage Weil 已提交
1406 1407 1408 1409 1410 1411 1412
		parent = d_find_alias(snapdir);
		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)
1413
			ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
S
Sage Weil 已提交
1414 1415
	}

Y
Yan, Zheng 已提交
1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426
	if (ceph_frag_is_leftmost(frag) && req->r_readdir_offset == 2) {
		/* note dir version at start of readdir so we can tell
		 * if any dentries get dropped */
		struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
		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;

1427
	/* FIXME: release caps/leases if error occurs */
S
Sage Weil 已提交
1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451
	for (i = 0; i < rinfo->dir_nr; i++) {
		struct ceph_vino vino;

		dname.name = rinfo->dir_dname[i];
		dname.len = rinfo->dir_dname_len[i];
		dname.hash = full_name_hash(dname.name, dname.len);

		vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
		vino.snap = le64_to_cpu(rinfo->dir_in[i].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 == NULL) {
				dout("d_alloc badness\n");
				err = -ENOMEM;
				goto out;
			}
1452 1453
			ret = ceph_init_dentry(dn);
			if (ret < 0) {
1454
				dput(dn);
1455
				err = ret;
S
Sage Weil 已提交
1456
				goto out;
1457
			}
1458 1459 1460
		} else if (d_really_is_positive(dn) &&
			   (ceph_ino(d_inode(dn)) != vino.ino ||
			    ceph_snap(d_inode(dn)) != vino.snap)) {
S
Sage Weil 已提交
1461
			dout(" dn %p points to wrong inode %p\n",
1462
			     dn, d_inode(dn));
S
Sage Weil 已提交
1463 1464 1465 1466 1467 1468
			d_delete(dn);
			dput(dn);
			goto retry_lookup;
		}

		/* inode */
1469 1470
		if (d_really_is_positive(dn)) {
			in = d_inode(dn);
S
Sage Weil 已提交
1471 1472
		} else {
			in = ceph_get_inode(parent->d_sb, vino);
1473
			if (IS_ERR(in)) {
S
Sage Weil 已提交
1474
				dout("new_inode badness\n");
1475
				d_drop(dn);
S
Sage Weil 已提交
1476
				dput(dn);
1477
				err = PTR_ERR(in);
S
Sage Weil 已提交
1478 1479 1480 1481
				goto out;
			}
		}

Y
Yan, Zheng 已提交
1482 1483 1484 1485
		ret = fill_inode(in, NULL, &rinfo->dir_in[i], NULL, session,
				 req->r_request_started, -1,
				 &req->r_caps_reservation);
		if (ret < 0) {
S
Sage Weil 已提交
1486
			pr_err("fill_inode badness on %p\n", in);
1487
			if (d_really_is_negative(dn))
1488 1489
				iput(in);
			d_drop(dn);
Y
Yan, Zheng 已提交
1490
			err = ret;
1491
			goto next_item;
S
Sage Weil 已提交
1492
		}
1493

1494
		if (d_really_is_negative(dn)) {
1495
			struct dentry *realdn = splice_dentry(dn, in);
Y
Yan, Zheng 已提交
1496 1497 1498
			if (IS_ERR(realdn)) {
				err = PTR_ERR(realdn);
				d_drop(dn);
1499 1500 1501
				dn = NULL;
				goto next_item;
			}
Y
Yan, Zheng 已提交
1502
			dn = realdn;
1503 1504 1505
		}

		di = dn->d_fsdata;
Y
Yan, Zheng 已提交
1506
		di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1507 1508 1509 1510

		update_dentry_lease(dn, rinfo->dir_dlease[i],
				    req->r_session,
				    req->r_request_started);
Y
Yan, Zheng 已提交
1511 1512 1513 1514 1515 1516 1517

		if (err == 0 && cache_ctl.index >= 0) {
			ret = fill_readdir_cache(d_inode(parent), dn,
						 &cache_ctl, req);
			if (ret < 0)
				err = ret;
		}
1518 1519 1520
next_item:
		if (dn)
			dput(dn);
S
Sage Weil 已提交
1521 1522
	}
out:
Y
Yan, Zheng 已提交
1523 1524 1525 1526 1527
	if (err == 0) {
		req->r_did_prepopulate = true;
		req->r_readdir_cache_idx = cache_ctl.index;
	}
	ceph_readdir_cache_release(&cache_ctl);
S
Sage Weil 已提交
1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540
	if (snapdir) {
		iput(snapdir);
		dput(parent);
	}
	dout("readdir_prepopulate done\n");
	return err;
}

int ceph_inode_set_size(struct inode *inode, loff_t size)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	int ret = 0;

1541
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1542
	dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1543
	i_size_write(inode, size);
S
Sage Weil 已提交
1544 1545 1546 1547 1548 1549 1550
	inode->i_blocks = (size + (1 << 9) - 1) >> 9;

	/* tell the MDS if we are approaching max_size */
	if ((size << 1) >= ci->i_max_size &&
	    (ci->i_reported_size << 1) < ci->i_max_size)
		ret = 1;

1551
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1552 1553 1554 1555 1556 1557 1558
	return ret;
}

/*
 * Write back inode data in a worker thread.  (This can't be done
 * in the message handler context.)
 */
1559 1560
void ceph_queue_writeback(struct inode *inode)
{
1561
	ihold(inode);
1562 1563
	if (queue_work(ceph_inode_to_client(inode)->wb_wq,
		       &ceph_inode(inode)->i_wb_work)) {
1564
		dout("ceph_queue_writeback %p\n", inode);
1565
	} else {
1566
		dout("ceph_queue_writeback %p failed\n", inode);
1567
		iput(inode);
1568 1569 1570 1571
	}
}

static void ceph_writeback_work(struct work_struct *work)
S
Sage Weil 已提交
1572 1573 1574 1575 1576 1577 1578 1579 1580 1581
{
	struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
						  i_wb_work);
	struct inode *inode = &ci->vfs_inode;

	dout("writeback %p\n", inode);
	filemap_fdatawrite(&inode->i_data);
	iput(inode);
}

1582 1583 1584 1585 1586
/*
 * queue an async invalidation
 */
void ceph_queue_invalidate(struct inode *inode)
{
1587
	ihold(inode);
1588 1589 1590 1591 1592
	if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
		       &ceph_inode(inode)->i_pg_inv_work)) {
		dout("ceph_queue_invalidate %p\n", inode);
	} else {
		dout("ceph_queue_invalidate %p failed\n", inode);
1593
		iput(inode);
1594 1595 1596
	}
}

S
Sage Weil 已提交
1597 1598 1599 1600
/*
 * Invalidate inode pages in a worker thread.  (This can't be done
 * in the message handler context.)
 */
1601
static void ceph_invalidate_work(struct work_struct *work)
S
Sage Weil 已提交
1602 1603 1604 1605 1606 1607 1608
{
	struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
						  i_pg_inv_work);
	struct inode *inode = &ci->vfs_inode;
	u32 orig_gen;
	int check = 0;

Y
Yan, Zheng 已提交
1609
	mutex_lock(&ci->i_truncate_mutex);
1610
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1611 1612
	dout("invalidate_pages %p gen %d revoking %d\n", inode,
	     ci->i_rdcache_gen, ci->i_rdcache_revoking);
1613
	if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
Y
Yan, Zheng 已提交
1614 1615
		if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
			check = 1;
1616
		spin_unlock(&ci->i_ceph_lock);
Y
Yan, Zheng 已提交
1617
		mutex_unlock(&ci->i_truncate_mutex);
S
Sage Weil 已提交
1618 1619 1620
		goto out;
	}
	orig_gen = ci->i_rdcache_gen;
1621
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1622

1623
	truncate_pagecache(inode, 0);
S
Sage Weil 已提交
1624

1625
	spin_lock(&ci->i_ceph_lock);
1626 1627
	if (orig_gen == ci->i_rdcache_gen &&
	    orig_gen == ci->i_rdcache_revoking) {
S
Sage Weil 已提交
1628 1629
		dout("invalidate_pages %p gen %d successful\n", inode,
		     ci->i_rdcache_gen);
1630
		ci->i_rdcache_revoking--;
S
Sage Weil 已提交
1631 1632
		check = 1;
	} else {
1633 1634 1635
		dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
		     inode, orig_gen, ci->i_rdcache_gen,
		     ci->i_rdcache_revoking);
Y
Yan, Zheng 已提交
1636 1637
		if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
			check = 1;
S
Sage Weil 已提交
1638
	}
1639
	spin_unlock(&ci->i_ceph_lock);
Y
Yan, Zheng 已提交
1640
	mutex_unlock(&ci->i_truncate_mutex);
Y
Yan, Zheng 已提交
1641
out:
S
Sage Weil 已提交
1642 1643 1644 1645 1646 1647 1648
	if (check)
		ceph_check_caps(ci, 0, NULL);
	iput(inode);
}


/*
1649
 * called by trunc_wq;
S
Sage Weil 已提交
1650 1651 1652
 *
 * We also truncate in a separate thread as well.
 */
1653
static void ceph_vmtruncate_work(struct work_struct *work)
S
Sage Weil 已提交
1654 1655 1656 1657 1658 1659
{
	struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
						  i_vmtruncate_work);
	struct inode *inode = &ci->vfs_inode;

	dout("vmtruncate_work %p\n", inode);
Y
Yan, Zheng 已提交
1660
	__ceph_do_pending_vmtruncate(inode);
S
Sage Weil 已提交
1661 1662 1663
	iput(inode);
}

1664 1665 1666 1667 1668 1669 1670 1671
/*
 * Queue an async vmtruncate.  If we fail to queue work, we will handle
 * the truncation the next time we call __ceph_do_pending_vmtruncate.
 */
void ceph_queue_vmtruncate(struct inode *inode)
{
	struct ceph_inode_info *ci = ceph_inode(inode);

1672
	ihold(inode);
1673

1674
	if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1675 1676 1677 1678 1679
		       &ci->i_vmtruncate_work)) {
		dout("ceph_queue_vmtruncate %p\n", inode);
	} else {
		dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
		     inode, ci->i_truncate_pending);
1680
		iput(inode);
1681 1682 1683
	}
}

S
Sage Weil 已提交
1684 1685 1686 1687
/*
 * Make sure any pending truncation is applied before doing anything
 * that may depend on it.
 */
Y
Yan, Zheng 已提交
1688
void __ceph_do_pending_vmtruncate(struct inode *inode)
S
Sage Weil 已提交
1689 1690 1691
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	u64 to;
1692
	int wrbuffer_refs, finish = 0;
S
Sage Weil 已提交
1693

Y
Yan, Zheng 已提交
1694
	mutex_lock(&ci->i_truncate_mutex);
S
Sage Weil 已提交
1695
retry:
1696
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1697 1698
	if (ci->i_truncate_pending == 0) {
		dout("__do_pending_vmtruncate %p none pending\n", inode);
1699
		spin_unlock(&ci->i_ceph_lock);
Y
Yan, Zheng 已提交
1700
		mutex_unlock(&ci->i_truncate_mutex);
S
Sage Weil 已提交
1701 1702 1703 1704 1705 1706 1707 1708 1709 1710
		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) {
		dout("__do_pending_vmtruncate %p flushing snaps first\n",
		     inode);
1711
		spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1712 1713 1714 1715 1716
		filemap_write_and_wait_range(&inode->i_data, 0,
					     inode->i_sb->s_maxbytes);
		goto retry;
	}

Y
Yan, Zheng 已提交
1717 1718 1719
	/* there should be no reader or writer */
	WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);

S
Sage Weil 已提交
1720 1721 1722 1723
	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);
1724
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1725

1726
	truncate_pagecache(inode, to);
S
Sage Weil 已提交
1727

1728
	spin_lock(&ci->i_ceph_lock);
1729 1730 1731 1732
	if (to == ci->i_truncate_size) {
		ci->i_truncate_pending = 0;
		finish = 1;
	}
1733
	spin_unlock(&ci->i_ceph_lock);
1734 1735
	if (!finish)
		goto retry;
S
Sage Weil 已提交
1736

Y
Yan, Zheng 已提交
1737 1738
	mutex_unlock(&ci->i_truncate_mutex);

S
Sage Weil 已提交
1739 1740
	if (wrbuffer_refs == 0)
		ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1741 1742

	wake_up_all(&ci->i_cap_wq);
S
Sage Weil 已提交
1743 1744 1745 1746 1747 1748 1749
}

/*
 * symlinks
 */
static const struct inode_operations ceph_symlink_iops = {
	.readlink = generic_readlink,
1750
	.get_link = simple_get_link,
Y
Yan, Zheng 已提交
1751 1752 1753 1754 1755 1756
	.setattr = ceph_setattr,
	.getattr = ceph_getattr,
	.setxattr = ceph_setxattr,
	.getxattr = ceph_getxattr,
	.listxattr = ceph_listxattr,
	.removexattr = ceph_removexattr,
S
Sage Weil 已提交
1757 1758 1759 1760 1761 1762 1763
};

/*
 * setattr
 */
int ceph_setattr(struct dentry *dentry, struct iattr *attr)
{
1764
	struct inode *inode = d_inode(dentry);
S
Sage Weil 已提交
1765 1766 1767
	struct ceph_inode_info *ci = ceph_inode(inode);
	const unsigned int ia_valid = attr->ia_valid;
	struct ceph_mds_request *req;
1768
	struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1769
	struct ceph_cap_flush *prealloc_cf;
S
Sage Weil 已提交
1770 1771 1772 1773
	int issued;
	int release = 0, dirtied = 0;
	int mask = 0;
	int err = 0;
1774
	int inode_dirty_flags = 0;
1775
	bool lock_snap_rwsem = false;
S
Sage Weil 已提交
1776 1777 1778 1779 1780 1781 1782 1783

	if (ceph_snap(inode) != CEPH_NOSNAP)
		return -EROFS;

	err = inode_change_ok(inode, attr);
	if (err != 0)
		return err;

1784 1785 1786 1787
	prealloc_cf = ceph_alloc_cap_flush();
	if (!prealloc_cf)
		return -ENOMEM;

S
Sage Weil 已提交
1788 1789
	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
				       USE_AUTH_MDS);
1790 1791
	if (IS_ERR(req)) {
		ceph_free_cap_flush(prealloc_cf);
S
Sage Weil 已提交
1792
		return PTR_ERR(req);
1793
	}
S
Sage Weil 已提交
1794

1795
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1796
	issued = __ceph_caps_issued(ci, NULL);
1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808

	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);
		}
	}

S
Sage Weil 已提交
1809 1810 1811 1812
	dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));

	if (ia_valid & ATTR_UID) {
		dout("setattr %p uid %d -> %d\n", inode,
1813 1814
		     from_kuid(&init_user_ns, inode->i_uid),
		     from_kuid(&init_user_ns, attr->ia_uid));
S
Sage Weil 已提交
1815 1816 1817 1818
		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 ||
1819 1820 1821
			   !uid_eq(attr->ia_uid, inode->i_uid)) {
			req->r_args.setattr.uid = cpu_to_le32(
				from_kuid(&init_user_ns, attr->ia_uid));
S
Sage Weil 已提交
1822 1823 1824 1825 1826 1827
			mask |= CEPH_SETATTR_UID;
			release |= CEPH_CAP_AUTH_SHARED;
		}
	}
	if (ia_valid & ATTR_GID) {
		dout("setattr %p gid %d -> %d\n", inode,
1828 1829
		     from_kgid(&init_user_ns, inode->i_gid),
		     from_kgid(&init_user_ns, attr->ia_gid));
S
Sage Weil 已提交
1830 1831 1832 1833
		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 ||
1834 1835 1836
			   !gid_eq(attr->ia_gid, inode->i_gid)) {
			req->r_args.setattr.gid = cpu_to_le32(
				from_kgid(&init_user_ns, attr->ia_gid));
S
Sage Weil 已提交
1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848
			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) {
G
Guangliang Zhao 已提交
1849
			inode->i_mode = attr->ia_mode;
S
Sage Weil 已提交
1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904
			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 %ld.%ld -> %ld.%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) &&
			   timespec_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 ||
			   !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
			ceph_encode_timespec(&req->r_args.setattr.atime,
					     &attr->ia_atime);
			mask |= CEPH_SETATTR_ATIME;
			release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
				CEPH_CAP_FILE_WR;
		}
	}
	if (ia_valid & ATTR_MTIME) {
		dout("setattr %p mtime %ld.%ld -> %ld.%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) &&
			   timespec_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 ||
			   !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
			ceph_encode_timespec(&req->r_args.setattr.mtime,
					     &attr->ia_mtime);
			mask |= CEPH_SETATTR_MTIME;
			release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
				CEPH_CAP_FILE_WR;
		}
	}
	if (ia_valid & ATTR_SIZE) {
		dout("setattr %p size %lld -> %lld\n", inode,
		     inode->i_size, attr->ia_size);
		if ((issued & CEPH_CAP_FILE_EXCL) &&
		    attr->ia_size > inode->i_size) {
1905
			i_size_write(inode, attr->ia_size);
S
Sage Weil 已提交
1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950
			inode->i_blocks =
				(attr->ia_size + (1 << 9) - 1) >> 9;
			inode->i_ctime = attr->ia_ctime;
			ci->i_reported_size = attr->ia_size;
			dirtied |= CEPH_CAP_FILE_EXCL;
		} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
			   attr->ia_size != inode->i_size) {
			req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
			req->r_args.setattr.old_size =
				cpu_to_le64(inode->i_size);
			mask |= CEPH_SETATTR_SIZE;
			release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_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 %ld.%ld -> %ld.%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");
		inode->i_ctime = attr->ia_ctime;
		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) {
1951 1952
		inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
							   &prealloc_cf);
S
Sage Weil 已提交
1953 1954 1955 1956
		inode->i_ctime = CURRENT_TIME;
	}

	release &= issued;
1957
	spin_unlock(&ci->i_ceph_lock);
1958 1959
	if (lock_snap_rwsem)
		up_read(&mdsc->snap_rwsem);
S
Sage Weil 已提交
1960

1961 1962 1963
	if (inode_dirty_flags)
		__mark_inode_dirty(inode, inode_dirty_flags);

G
Guangliang Zhao 已提交
1964
	if (ia_valid & ATTR_MODE) {
1965
		err = posix_acl_chmod(inode, attr->ia_mode);
G
Guangliang Zhao 已提交
1966 1967 1968 1969
		if (err)
			goto out_put;
	}

S
Sage Weil 已提交
1970
	if (mask) {
1971 1972
		req->r_inode = inode;
		ihold(inode);
S
Sage Weil 已提交
1973 1974 1975
		req->r_inode_drop = release;
		req->r_args.setattr.mask = cpu_to_le32(mask);
		req->r_num_caps = 1;
1976
		err = ceph_mdsc_do_request(mdsc, NULL, req);
S
Sage Weil 已提交
1977 1978 1979 1980 1981
	}
	dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
	     ceph_cap_string(dirtied), mask);

	ceph_mdsc_put_request(req);
Y
Yan, Zheng 已提交
1982 1983
	if (mask & CEPH_SETATTR_SIZE)
		__ceph_do_pending_vmtruncate(inode);
1984
	ceph_free_cap_flush(prealloc_cf);
S
Sage Weil 已提交
1985
	return err;
G
Guangliang Zhao 已提交
1986
out_put:
S
Sage Weil 已提交
1987
	ceph_mdsc_put_request(req);
1988
	ceph_free_cap_flush(prealloc_cf);
S
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1989 1990 1991 1992 1993 1994 1995
	return err;
}

/*
 * Verify that we have a lease on the given mask.  If not,
 * do a getattr against an mds.
 */
1996 1997
int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
		      int mask, bool force)
S
Sage Weil 已提交
1998
{
1999 2000
	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
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2001 2002 2003 2004 2005 2006 2007 2008
	struct ceph_mds_request *req;
	int err;

	if (ceph_snap(inode) == CEPH_SNAPDIR) {
		dout("do_getattr inode %p SNAPDIR\n", inode);
		return 0;
	}

2009 2010
	dout("do_getattr inode %p mask %s mode 0%o\n",
	     inode, ceph_cap_string(mask), inode->i_mode);
2011
	if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
S
Sage Weil 已提交
2012 2013 2014 2015 2016
		return 0;

	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
	if (IS_ERR(req))
		return PTR_ERR(req);
2017 2018
	req->r_inode = inode;
	ihold(inode);
S
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2019 2020
	req->r_num_caps = 1;
	req->r_args.getattr.mask = cpu_to_le32(mask);
2021
	req->r_locked_page = locked_page;
S
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2022
	err = ceph_mdsc_do_request(mdsc, NULL, req);
2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033
	if (locked_page && err == 0) {
		u64 inline_version = req->r_reply_info.targeti.inline_version;
		if (inline_version == 0) {
			/* the reply is supposed to contain inline data */
			err = -EINVAL;
		} else if (inline_version == CEPH_INLINE_NONE) {
			err = -ENODATA;
		} else {
			err = req->r_reply_info.targeti.inline_len;
		}
	}
S
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2034 2035 2036 2037 2038 2039 2040 2041 2042 2043
	ceph_mdsc_put_request(req);
	dout("do_getattr result=%d\n", err);
	return err;
}


/*
 * Check inode permissions.  We verify we have a valid value for
 * the AUTH cap, then call the generic handler.
 */
2044
int ceph_permission(struct inode *inode, int mask)
S
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2045
{
2046 2047
	int err;

2048
	if (mask & MAY_NOT_BLOCK)
2049 2050
		return -ECHILD;

2051
	err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
S
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2052 2053

	if (!err)
2054
		err = generic_permission(inode, mask);
S
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2055 2056 2057 2058 2059 2060 2061 2062 2063 2064
	return err;
}

/*
 * Get all attributes.  Hopefully somedata we'll have a statlite()
 * and can limit the fields we require to be accurate.
 */
int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
		 struct kstat *stat)
{
2065
	struct inode *inode = d_inode(dentry);
2066
	struct ceph_inode_info *ci = ceph_inode(inode);
S
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	int err;

2069
	err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
S
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2070 2071
	if (!err) {
		generic_fillattr(inode, stat);
Y
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		stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
S
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2073 2074 2075 2076
		if (ceph_snap(inode) != CEPH_NOSNAP)
			stat->dev = ceph_snap(inode);
		else
			stat->dev = 0;
2077
		if (S_ISDIR(inode->i_mode)) {
2078 2079 2080 2081 2082
			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;
2083
			stat->blocks = 0;
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			stat->blksize = 65536;
2085
		}
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	}
	return err;
}