inode.c 56.7 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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		if (size > 0 && S_ISDIR(inode->i_mode)) {
			pr_err("fill_file_size non-zero size for directory\n");
			size = 0;
		}
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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));
569 570 571 572 573 574
			/*
			 * 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
575 576
			if ((issued & (CEPH_CAP_FILE_CACHE|
				       CEPH_CAP_FILE_BUFFER)) ||
577 578
			    mapping_mapped(inode->i_mapping) ||
			    __ceph_caps_file_wanted(ci)) {
S
Sage Weil 已提交
579 580 581 582 583 584 585 586 587 588 589
				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;
	}
590 591 592 593

	if (queue_trunc)
		ceph_fscache_invalidate(inode);

S
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594 595 596 597 598 599 600 601 602 603 604 605
	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
606 607 608
		      CEPH_CAP_FILE_BUFFER|
		      CEPH_CAP_AUTH_EXCL|
		      CEPH_CAP_XATTR_EXCL)) {
S
Sage Weil 已提交
609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647
		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
648
		/* we have no write|excl caps; whatever the MDS says is true */
S
Sage Weil 已提交
649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666
		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.
 */
667
static int fill_inode(struct inode *inode, struct page *locked_page,
S
Sage Weil 已提交
668 669 670 671 672 673
		      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)
{
674
	struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
S
Sage Weil 已提交
675 676
	struct ceph_mds_reply_inode *info = iinfo->in;
	struct ceph_inode_info *ci = ceph_inode(inode);
677
	int issued = 0, implemented, new_issued;
S
Sage Weil 已提交
678 679
	struct timespec mtime, atime, ctime;
	struct ceph_buffer *xattr_blob = NULL;
680
	struct ceph_cap *new_cap = NULL;
S
Sage Weil 已提交
681
	int err = 0;
682
	bool wake = false;
683 684
	bool queue_trunc = false;
	bool new_version = false;
Y
Yan, Zheng 已提交
685
	bool fill_inline = false;
S
Sage Weil 已提交
686 687 688 689 690

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

691 692 693 694
	/* 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
695 696 697 698 699 700
	/*
	 * 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
701
		xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
S
Sage Weil 已提交
702 703 704 705 706
		if (!xattr_blob)
			pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
			       iinfo->xattr_len);
	}

707
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
708 709 710

	/*
	 * provided version will be odd if inode value is projected,
711 712 713 714 715 716 717 718
	 * 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
719
	 */
720 721 722 723 724
	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
725 726
	issued = __ceph_caps_issued(ci, &implemented);
	issued |= implemented | __ceph_caps_dirty(ci);
727
	new_issued = ~issued & le32_to_cpu(info->cap.caps);
S
Sage Weil 已提交
728 729 730 731 732

	/* update inode */
	ci->i_version = le64_to_cpu(info->version);
	inode->i_version++;
	inode->i_rdev = le32_to_cpu(info->rdev);
733
	inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
S
Sage Weil 已提交
734

735 736
	if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
	    (issued & CEPH_CAP_AUTH_EXCL) == 0) {
S
Sage Weil 已提交
737
		inode->i_mode = le32_to_cpu(info->mode);
738 739
		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
740
		dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
741 742
		     from_kuid(&init_user_ns, inode->i_uid),
		     from_kgid(&init_user_ns, inode->i_gid));
S
Sage Weil 已提交
743 744
	}

745 746
	if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
	    (issued & CEPH_CAP_LINK_EXCL) == 0)
M
Miklos Szeredi 已提交
747
		set_nlink(inode, le32_to_cpu(info->nlink));
S
Sage Weil 已提交
748

749 750 751 752 753 754 755 756 757 758 759 760
	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))) {
761 762
		if (ci->i_layout.fl_pg_pool != info->layout.fl_pg_pool)
			ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
763
		ci->i_layout = info->layout;
764
		ci->i_pool_ns_len = iinfo->pool_ns_len;
765

766 767 768 769 770 771 772 773 774 775 776 777
		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
778 779 780

	/* xattrs */
	/* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
781
	if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
S
Sage Weil 已提交
782 783 784 785 786 787 788 789
	    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
790
		ceph_forget_all_cached_acls(inode);
791
		xattr_blob = NULL;
S
Sage Weil 已提交
792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810
	}

	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) {
811
			u32 symlen = iinfo->symlink_len;
S
Sage Weil 已提交
812 813
			char *sym;

814
			spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
815

816
			err = -EINVAL;
817
			if (WARN_ON(symlen != i_size_read(inode)))
818 819
				goto out;

S
Sage Weil 已提交
820
			err = -ENOMEM;
821
			sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
S
Sage Weil 已提交
822 823 824
			if (!sym)
				goto out;

825
			spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
826 827 828 829 830
			if (!ci->i_symlink)
				ci->i_symlink = sym;
			else
				kfree(sym); /* lost a race */
		}
A
Al Viro 已提交
831
		inode->i_link = ci->i_symlink;
S
Sage Weil 已提交
832 833 834 835 836
		break;
	case S_IFDIR:
		inode->i_op = &ceph_dir_iops;
		inode->i_fop = &ceph_dir_fops;

837 838
		ci->i_dir_layout = iinfo->dir_layout;

S
Sage Weil 已提交
839 840 841 842 843 844 845 846 847 848 849 850 851 852 853
		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) {
854
			unsigned caps = le32_to_cpu(info->cap.caps);
S
Sage Weil 已提交
855 856
			ceph_add_cap(inode, session,
				     le64_to_cpu(info->cap.cap_id),
857
				     cap_fmode, caps,
S
Sage Weil 已提交
858 859 860 861
				     le32_to_cpu(info->cap.wanted),
				     le32_to_cpu(info->cap.seq),
				     le32_to_cpu(info->cap.mseq),
				     le64_to_cpu(info->cap.realm),
862
				     info->cap.flags, &new_cap);
863 864 865 866 867 868 869 870

			/* 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
871
				i_size_write(inode, 0);
872
				__ceph_dir_set_complete(ci,
Y
Yan, Zheng 已提交
873 874
					atomic64_read(&ci->i_release_count),
					atomic64_read(&ci->i_ordered_count));
875 876
			}

877
			wake = true;
S
Sage Weil 已提交
878 879 880 881 882 883 884
		} 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);
		}
885
	} else if (cap_fmode >= 0) {
886
		pr_warn("mds issued no caps on %llx.%llx\n",
887 888
			   ceph_vinop(inode));
		__ceph_get_fmode(ci, cap_fmode);
S
Sage Weil 已提交
889
	}
Y
Yan, Zheng 已提交
890 891 892 893 894 895

	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 &&
896 897
		    (locked_page ||
		     (le32_to_cpu(info->cap.caps) & cache_caps)))
Y
Yan, Zheng 已提交
898 899 900
			fill_inline = true;
	}

901
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
902

Y
Yan, Zheng 已提交
903
	if (fill_inline)
904
		ceph_fill_inline_data(inode, locked_page,
Y
Yan, Zheng 已提交
905 906
				      iinfo->inline_data, iinfo->inline_len);

907 908 909
	if (wake)
		wake_up_all(&ci->i_cap_wq);

S
Sage Weil 已提交
910 911
	/* queue truncate if we saw i_size decrease */
	if (queue_trunc)
912
		ceph_queue_vmtruncate(inode);
S
Sage Weil 已提交
913 914

	/* populate frag tree */
915 916
	if (S_ISDIR(inode->i_mode))
		ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
S
Sage Weil 已提交
917 918 919 920 921 922 923

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

	err = 0;
out:
924 925
	if (new_cap)
		ceph_put_cap(mdsc, new_cap);
S
Sage Weil 已提交
926 927
	if (xattr_blob)
		ceph_buffer_put(xattr_blob);
S
Sage Weil 已提交
928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949
	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
950 951
	dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
	     dentry, duration, ttl);
S
Sage Weil 已提交
952 953

	/* make lease_rdcache_gen match directory */
954
	dir = d_inode(dentry->d_parent);
S
Sage Weil 已提交
955 956
	di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;

S
Sage Weil 已提交
957
	if (duration == 0)
S
Sage Weil 已提交
958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984
		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.
 */
985
static struct dentry *splice_dentry(struct dentry *dn, struct inode *in)
S
Sage Weil 已提交
986 987 988
{
	struct dentry *realdn;

989
	BUG_ON(d_inode(dn));
S
Sage Weil 已提交
990

S
Sage Weil 已提交
991 992 993
	/* dn must be unhashed */
	if (!d_unhashed(dn))
		d_drop(dn);
994
	realdn = d_splice_alias(in, dn);
S
Sage Weil 已提交
995
	if (IS_ERR(realdn)) {
996 997
		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
998 999 1000 1001 1002
		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
1003 1004
		     dn, d_count(dn),
		     realdn, d_count(realdn),
1005
		     d_inode(realdn), ceph_vinop(d_inode(realdn)));
S
Sage Weil 已提交
1006 1007 1008 1009 1010
		dput(dn);
		dn = realdn;
	} else {
		BUG_ON(!ceph_dentry(dn));
		dout("dn %p attached to %p ino %llx.%llx\n",
1011
		     dn, d_inode(dn), ceph_vinop(d_inode(dn)));
S
Sage Weil 已提交
1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
	}
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;
1034
	struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
S
Sage Weil 已提交
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 1072 1073 1074 1075
	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");
1076 1077
		if (rinfo->head->result == 0 && req->r_locked_dir)
			ceph_invalidate_dir_request(req);
S
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1078 1079 1080 1081
		return 0;
	}

	if (rinfo->head->is_dentry) {
1082 1083
		struct inode *dir = req->r_locked_dir;

1084
		if (dir) {
1085 1086
			err = fill_inode(dir, NULL,
					 &rinfo->diri, rinfo->dirfrag,
1087 1088 1089
					 session, req->r_request_started, -1,
					 &req->r_caps_reservation);
			if (err < 0)
1090
				goto done;
1091 1092 1093
		} else {
			WARN_ON_ONCE(1);
		}
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 1126 1127 1128 1129

		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;
				}
1130 1131 1132
			} else if (d_really_is_positive(dn) &&
				   (ceph_ino(d_inode(dn)) != vino.ino ||
				    ceph_snap(d_inode(dn)) != vino.snap)) {
1133
				dout(" dn %p points to wrong inode %p\n",
1134
				     dn, d_inode(dn));
1135 1136 1137 1138 1139 1140 1141 1142
				d_delete(dn);
				dput(dn);
				goto retry_lookup;
			}

			req->r_dentry = dn;
			dput(parent);
		}
1143 1144
	}

1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155
	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;

1156
		err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1157
				session, req->r_request_started,
1158
				(!req->r_aborted && rinfo->head->result == 0) ?
1159 1160 1161 1162 1163 1164 1165 1166 1167
				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;
		}
	}

1168 1169 1170 1171 1172
	/*
	 * 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 &&
1173
	    req->r_locked_dir &&
1174
	    (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1175
					       fsc->mount_options->snapdir_name,
1176
					       req->r_dentry->d_name.len))) {
S
Sage Weil 已提交
1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
		/*
		 * 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);
1188
		BUG_ON(d_inode(dn->d_parent) != dir);
S
Sage Weil 已提交
1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200
		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
1201
			le32_to_cpu(rinfo->dlease->duration_ms);
S
Sage Weil 已提交
1202 1203 1204 1205 1206
		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) {
1207 1208 1209
			struct inode *olddir = req->r_old_dentry_dir;
			BUG_ON(!olddir);

A
Al Viro 已提交
1210
			dout(" src %p '%pd' dst %p '%pd'\n",
S
Sage Weil 已提交
1211
			     req->r_old_dentry,
A
Al Viro 已提交
1212 1213
			     req->r_old_dentry,
			     dn, dn);
S
Sage Weil 已提交
1214 1215
			dout("fill_trace doing d_move %p -> %p\n",
			     req->r_old_dentry, dn);
S
Sage Weil 已提交
1216

Y
Yan, Zheng 已提交
1217 1218 1219 1220
			/* d_move screws up sibling dentries' offsets */
			ceph_dir_clear_ordered(dir);
			ceph_dir_clear_ordered(olddir);

S
Sage Weil 已提交
1221
			d_move(req->r_old_dentry, dn);
A
Al Viro 已提交
1222 1223
			dout(" src %p '%pd' dst %p '%pd'\n",
			     req->r_old_dentry,
S
Sage Weil 已提交
1224
			     req->r_old_dentry,
A
Al Viro 已提交
1225
			     dn, dn);
1226

1227 1228
			/* ensure target dentry is invalidated, despite
			   rehashing bug in vfs_rename_dir */
1229 1230
			ceph_invalidate_dentry_lease(dn);

1231
			dout("dn %p gets new offset %lld\n", req->r_old_dentry,
S
Sage Weil 已提交
1232
			     ceph_dentry(req->r_old_dentry)->offset);
1233

S
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1234 1235 1236 1237 1238 1239
			dn = req->r_old_dentry;  /* use old_dentry */
		}

		/* null dentry? */
		if (!rinfo->head->is_target) {
			dout("fill_trace null dentry\n");
1240
			if (d_really_is_positive(dn)) {
1241
				ceph_dir_clear_ordered(dir);
S
Sage Weil 已提交
1242 1243 1244 1245
				dout("d_delete %p\n", dn);
				d_delete(dn);
			} else {
				if (have_lease && d_unhashed(dn))
1246
					d_add(dn, NULL);
S
Sage Weil 已提交
1247 1248 1249 1250 1251 1252 1253 1254
				update_dentry_lease(dn, rinfo->dlease,
						    session,
						    req->r_request_started);
			}
			goto done;
		}

		/* attach proper inode */
1255
		if (d_really_is_negative(dn)) {
1256
			ceph_dir_clear_ordered(dir);
1257
			ihold(in);
1258
			dn = splice_dentry(dn, in);
S
Sage Weil 已提交
1259 1260 1261 1262 1263
			if (IS_ERR(dn)) {
				err = PTR_ERR(dn);
				goto done;
			}
			req->r_dentry = dn;  /* may have spliced */
1264
		} else if (d_really_is_positive(dn) && d_inode(dn) != in) {
S
Sage Weil 已提交
1265
			dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1266
			     dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1267
			     ceph_vinop(in));
1268
			d_invalidate(dn);
S
Sage Weil 已提交
1269 1270 1271 1272 1273 1274 1275
			have_lease = false;
		}

		if (have_lease)
			update_dentry_lease(dn, rinfo->dlease, session,
					    req->r_request_started);
		dout(" final dn %p\n", dn);
1276 1277 1278
	} 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
1279
		struct dentry *dn = req->r_dentry;
1280
		struct inode *dir = req->r_locked_dir;
S
Sage Weil 已提交
1281 1282 1283

		/* fill out a snapdir LOOKUPSNAP dentry */
		BUG_ON(!dn);
1284 1285
		BUG_ON(!dir);
		BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
S
Sage Weil 已提交
1286
		dout(" linking snapped dir %p to dn %p\n", in, dn);
1287
		ceph_dir_clear_ordered(dir);
1288
		ihold(in);
1289
		dn = splice_dentry(dn, in);
S
Sage Weil 已提交
1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
		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.
 */
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323
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;
		}
1324
		rc = fill_inode(in, NULL, &rinfo->dir_in[i], NULL, session,
1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336
				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
1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356
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);
1357 1358 1359 1360
		if (idx == 0)
			ctl->page = grab_cache_page(&dir->i_data, pgoff);
		else
			ctl->page = find_lock_page(&dir->i_data, pgoff);
Y
Yan, Zheng 已提交
1361 1362
		if (!ctl->page) {
			ctl->index = -1;
1363
			return idx == 0 ? -ENOMEM : 0;
Y
Yan, Zheng 已提交
1364 1365 1366 1367 1368
		}
		/* reading/filling the cache are serialized by
		 * i_mutex, no need to use page lock */
		unlock_page(ctl->page);
		ctl->dentries = kmap(ctl->page);
1369 1370
		if (idx == 0)
			memset(ctl->dentries, 0, PAGE_CACHE_SIZE);
Y
Yan, Zheng 已提交
1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384
	}

	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
1385 1386 1387 1388 1389 1390 1391 1392
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;
Y
Yan, Zheng 已提交
1393
	int err = 0, skipped = 0, ret, i;
S
Sage Weil 已提交
1394 1395 1396
	struct inode *snapdir = NULL;
	struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
	struct ceph_dentry_info *di;
1397
	u32 frag = le32_to_cpu(rhead->args.readdir.frag);
Y
Yan, Zheng 已提交
1398 1399 1400 1401
	struct ceph_readdir_cache_control cache_ctl = {};

	if (req->r_aborted)
		return readdir_prepopulate_inodes_only(req, session);
1402 1403 1404 1405 1406 1407 1408

	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
1409
			req->r_readdir_offset = 2;
1410
		else
Y
Yan, Zheng 已提交
1411
			req->r_readdir_offset = 0;
1412
	}
S
Sage Weil 已提交
1413 1414

	if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1415
		snapdir = ceph_get_snapdir(d_inode(parent));
S
Sage Weil 已提交
1416 1417 1418 1419 1420 1421 1422
		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)
1423
			ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
S
Sage Weil 已提交
1424 1425
	}

Y
Yan, Zheng 已提交
1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436
	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;

1437
	/* FIXME: release caps/leases if error occurs */
S
Sage Weil 已提交
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461
	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;
			}
1462 1463
			ret = ceph_init_dentry(dn);
			if (ret < 0) {
1464
				dput(dn);
1465
				err = ret;
S
Sage Weil 已提交
1466
				goto out;
1467
			}
1468 1469 1470
		} 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
1471
			dout(" dn %p points to wrong inode %p\n",
1472
			     dn, d_inode(dn));
S
Sage Weil 已提交
1473 1474 1475 1476 1477 1478
			d_delete(dn);
			dput(dn);
			goto retry_lookup;
		}

		/* inode */
1479 1480
		if (d_really_is_positive(dn)) {
			in = d_inode(dn);
S
Sage Weil 已提交
1481 1482
		} else {
			in = ceph_get_inode(parent->d_sb, vino);
1483
			if (IS_ERR(in)) {
S
Sage Weil 已提交
1484
				dout("new_inode badness\n");
1485
				d_drop(dn);
S
Sage Weil 已提交
1486
				dput(dn);
1487
				err = PTR_ERR(in);
S
Sage Weil 已提交
1488 1489 1490 1491
				goto out;
			}
		}

Y
Yan, Zheng 已提交
1492 1493 1494 1495
		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
1496
			pr_err("fill_inode badness on %p\n", in);
1497
			if (d_really_is_negative(dn))
1498 1499
				iput(in);
			d_drop(dn);
Y
Yan, Zheng 已提交
1500
			err = ret;
1501
			goto next_item;
S
Sage Weil 已提交
1502
		}
1503

1504
		if (d_really_is_negative(dn)) {
Y
Yan, Zheng 已提交
1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515
			struct dentry *realdn;

			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;
			}

			realdn = splice_dentry(dn, in);
Y
Yan, Zheng 已提交
1516 1517 1518
			if (IS_ERR(realdn)) {
				err = PTR_ERR(realdn);
				d_drop(dn);
1519 1520 1521
				dn = NULL;
				goto next_item;
			}
Y
Yan, Zheng 已提交
1522
			dn = realdn;
1523 1524 1525
		}

		di = dn->d_fsdata;
Y
Yan, Zheng 已提交
1526
		di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1527 1528 1529 1530

		update_dentry_lease(dn, rinfo->dir_dlease[i],
				    req->r_session,
				    req->r_request_started);
Y
Yan, Zheng 已提交
1531

Y
Yan, Zheng 已提交
1532
		if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
Y
Yan, Zheng 已提交
1533 1534 1535 1536 1537
			ret = fill_readdir_cache(d_inode(parent), dn,
						 &cache_ctl, req);
			if (ret < 0)
				err = ret;
		}
1538 1539 1540
next_item:
		if (dn)
			dput(dn);
S
Sage Weil 已提交
1541 1542
	}
out:
Y
Yan, Zheng 已提交
1543
	if (err == 0 && skipped == 0) {
Y
Yan, Zheng 已提交
1544 1545 1546 1547
		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
1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560
	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;

1561
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1562
	dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1563
	i_size_write(inode, size);
S
Sage Weil 已提交
1564 1565 1566 1567 1568 1569 1570
	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;

1571
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1572 1573 1574 1575 1576 1577 1578
	return ret;
}

/*
 * Write back inode data in a worker thread.  (This can't be done
 * in the message handler context.)
 */
1579 1580
void ceph_queue_writeback(struct inode *inode)
{
1581
	ihold(inode);
1582 1583
	if (queue_work(ceph_inode_to_client(inode)->wb_wq,
		       &ceph_inode(inode)->i_wb_work)) {
1584
		dout("ceph_queue_writeback %p\n", inode);
1585
	} else {
1586
		dout("ceph_queue_writeback %p failed\n", inode);
1587
		iput(inode);
1588 1589 1590 1591
	}
}

static void ceph_writeback_work(struct work_struct *work)
S
Sage Weil 已提交
1592 1593 1594 1595 1596 1597 1598 1599 1600 1601
{
	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);
}

1602 1603 1604 1605 1606
/*
 * queue an async invalidation
 */
void ceph_queue_invalidate(struct inode *inode)
{
1607
	ihold(inode);
1608 1609 1610 1611 1612
	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);
1613
		iput(inode);
1614 1615 1616
	}
}

S
Sage Weil 已提交
1617 1618 1619 1620
/*
 * Invalidate inode pages in a worker thread.  (This can't be done
 * in the message handler context.)
 */
1621
static void ceph_invalidate_work(struct work_struct *work)
S
Sage Weil 已提交
1622 1623 1624 1625 1626 1627 1628
{
	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
1629
	mutex_lock(&ci->i_truncate_mutex);
1630
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1631 1632
	dout("invalidate_pages %p gen %d revoking %d\n", inode,
	     ci->i_rdcache_gen, ci->i_rdcache_revoking);
1633
	if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
Y
Yan, Zheng 已提交
1634 1635
		if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
			check = 1;
1636
		spin_unlock(&ci->i_ceph_lock);
Y
Yan, Zheng 已提交
1637
		mutex_unlock(&ci->i_truncate_mutex);
S
Sage Weil 已提交
1638 1639 1640
		goto out;
	}
	orig_gen = ci->i_rdcache_gen;
1641
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1642

1643
	truncate_pagecache(inode, 0);
S
Sage Weil 已提交
1644

1645
	spin_lock(&ci->i_ceph_lock);
1646 1647
	if (orig_gen == ci->i_rdcache_gen &&
	    orig_gen == ci->i_rdcache_revoking) {
S
Sage Weil 已提交
1648 1649
		dout("invalidate_pages %p gen %d successful\n", inode,
		     ci->i_rdcache_gen);
1650
		ci->i_rdcache_revoking--;
S
Sage Weil 已提交
1651 1652
		check = 1;
	} else {
1653 1654 1655
		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
1656 1657
		if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
			check = 1;
S
Sage Weil 已提交
1658
	}
1659
	spin_unlock(&ci->i_ceph_lock);
Y
Yan, Zheng 已提交
1660
	mutex_unlock(&ci->i_truncate_mutex);
Y
Yan, Zheng 已提交
1661
out:
S
Sage Weil 已提交
1662 1663 1664 1665 1666 1667 1668
	if (check)
		ceph_check_caps(ci, 0, NULL);
	iput(inode);
}


/*
1669
 * called by trunc_wq;
S
Sage Weil 已提交
1670 1671 1672
 *
 * We also truncate in a separate thread as well.
 */
1673
static void ceph_vmtruncate_work(struct work_struct *work)
S
Sage Weil 已提交
1674 1675 1676 1677 1678 1679
{
	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
1680
	__ceph_do_pending_vmtruncate(inode);
S
Sage Weil 已提交
1681 1682 1683
	iput(inode);
}

1684 1685 1686 1687 1688 1689 1690 1691
/*
 * 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);

1692
	ihold(inode);
1693

1694
	if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1695 1696 1697 1698 1699
		       &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);
1700
		iput(inode);
1701 1702 1703
	}
}

S
Sage Weil 已提交
1704 1705 1706 1707
/*
 * Make sure any pending truncation is applied before doing anything
 * that may depend on it.
 */
Y
Yan, Zheng 已提交
1708
void __ceph_do_pending_vmtruncate(struct inode *inode)
S
Sage Weil 已提交
1709 1710 1711
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	u64 to;
1712
	int wrbuffer_refs, finish = 0;
S
Sage Weil 已提交
1713

Y
Yan, Zheng 已提交
1714
	mutex_lock(&ci->i_truncate_mutex);
S
Sage Weil 已提交
1715
retry:
1716
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1717 1718
	if (ci->i_truncate_pending == 0) {
		dout("__do_pending_vmtruncate %p none pending\n", inode);
1719
		spin_unlock(&ci->i_ceph_lock);
Y
Yan, Zheng 已提交
1720
		mutex_unlock(&ci->i_truncate_mutex);
S
Sage Weil 已提交
1721 1722 1723 1724 1725 1726 1727 1728 1729 1730
		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);
1731
		spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1732 1733 1734 1735 1736
		filemap_write_and_wait_range(&inode->i_data, 0,
					     inode->i_sb->s_maxbytes);
		goto retry;
	}

Y
Yan, Zheng 已提交
1737 1738 1739
	/* there should be no reader or writer */
	WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);

S
Sage Weil 已提交
1740 1741 1742 1743
	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);
1744
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1745

1746
	truncate_pagecache(inode, to);
S
Sage Weil 已提交
1747

1748
	spin_lock(&ci->i_ceph_lock);
1749 1750 1751 1752
	if (to == ci->i_truncate_size) {
		ci->i_truncate_pending = 0;
		finish = 1;
	}
1753
	spin_unlock(&ci->i_ceph_lock);
1754 1755
	if (!finish)
		goto retry;
S
Sage Weil 已提交
1756

Y
Yan, Zheng 已提交
1757 1758
	mutex_unlock(&ci->i_truncate_mutex);

S
Sage Weil 已提交
1759 1760
	if (wrbuffer_refs == 0)
		ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1761 1762

	wake_up_all(&ci->i_cap_wq);
S
Sage Weil 已提交
1763 1764 1765 1766 1767 1768 1769
}

/*
 * symlinks
 */
static const struct inode_operations ceph_symlink_iops = {
	.readlink = generic_readlink,
1770
	.get_link = simple_get_link,
Y
Yan, Zheng 已提交
1771 1772 1773 1774 1775 1776
	.setattr = ceph_setattr,
	.getattr = ceph_getattr,
	.setxattr = ceph_setxattr,
	.getxattr = ceph_getxattr,
	.listxattr = ceph_listxattr,
	.removexattr = ceph_removexattr,
S
Sage Weil 已提交
1777 1778 1779 1780 1781 1782 1783
};

/*
 * setattr
 */
int ceph_setattr(struct dentry *dentry, struct iattr *attr)
{
1784
	struct inode *inode = d_inode(dentry);
S
Sage Weil 已提交
1785 1786 1787
	struct ceph_inode_info *ci = ceph_inode(inode);
	const unsigned int ia_valid = attr->ia_valid;
	struct ceph_mds_request *req;
1788
	struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1789
	struct ceph_cap_flush *prealloc_cf;
S
Sage Weil 已提交
1790 1791 1792 1793
	int issued;
	int release = 0, dirtied = 0;
	int mask = 0;
	int err = 0;
1794
	int inode_dirty_flags = 0;
1795
	bool lock_snap_rwsem = false;
S
Sage Weil 已提交
1796 1797 1798 1799 1800 1801 1802 1803

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

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

1804 1805 1806 1807
	prealloc_cf = ceph_alloc_cap_flush();
	if (!prealloc_cf)
		return -ENOMEM;

S
Sage Weil 已提交
1808 1809
	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
				       USE_AUTH_MDS);
1810 1811
	if (IS_ERR(req)) {
		ceph_free_cap_flush(prealloc_cf);
S
Sage Weil 已提交
1812
		return PTR_ERR(req);
1813
	}
S
Sage Weil 已提交
1814

1815
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1816
	issued = __ceph_caps_issued(ci, NULL);
1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828

	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
1829 1830 1831 1832
	dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));

	if (ia_valid & ATTR_UID) {
		dout("setattr %p uid %d -> %d\n", inode,
1833 1834
		     from_kuid(&init_user_ns, inode->i_uid),
		     from_kuid(&init_user_ns, attr->ia_uid));
S
Sage Weil 已提交
1835 1836 1837 1838
		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 ||
1839 1840 1841
			   !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
1842 1843 1844 1845 1846 1847
			mask |= CEPH_SETATTR_UID;
			release |= CEPH_CAP_AUTH_SHARED;
		}
	}
	if (ia_valid & ATTR_GID) {
		dout("setattr %p gid %d -> %d\n", inode,
1848 1849
		     from_kgid(&init_user_ns, inode->i_gid),
		     from_kgid(&init_user_ns, attr->ia_gid));
S
Sage Weil 已提交
1850 1851 1852 1853
		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 ||
1854 1855 1856
			   !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
1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868
			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
1869
			inode->i_mode = attr->ia_mode;
S
Sage Weil 已提交
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 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924
			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) {
1925
			i_size_write(inode, attr->ia_size);
S
Sage Weil 已提交
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 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970
			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) {
1971 1972
		inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
							   &prealloc_cf);
1973
		inode->i_ctime = current_fs_time(inode->i_sb);
S
Sage Weil 已提交
1974 1975 1976
	}

	release &= issued;
1977
	spin_unlock(&ci->i_ceph_lock);
1978 1979
	if (lock_snap_rwsem)
		up_read(&mdsc->snap_rwsem);
S
Sage Weil 已提交
1980

1981 1982 1983
	if (inode_dirty_flags)
		__mark_inode_dirty(inode, inode_dirty_flags);

G
Guangliang Zhao 已提交
1984
	if (ia_valid & ATTR_MODE) {
1985
		err = posix_acl_chmod(inode, attr->ia_mode);
G
Guangliang Zhao 已提交
1986 1987 1988 1989
		if (err)
			goto out_put;
	}

S
Sage Weil 已提交
1990
	if (mask) {
1991 1992
		req->r_inode = inode;
		ihold(inode);
S
Sage Weil 已提交
1993 1994 1995
		req->r_inode_drop = release;
		req->r_args.setattr.mask = cpu_to_le32(mask);
		req->r_num_caps = 1;
1996
		err = ceph_mdsc_do_request(mdsc, NULL, req);
S
Sage Weil 已提交
1997 1998 1999 2000 2001
	}
	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
2002 2003
	if (mask & CEPH_SETATTR_SIZE)
		__ceph_do_pending_vmtruncate(inode);
2004
	ceph_free_cap_flush(prealloc_cf);
S
Sage Weil 已提交
2005
	return err;
G
Guangliang Zhao 已提交
2006
out_put:
S
Sage Weil 已提交
2007
	ceph_mdsc_put_request(req);
2008
	ceph_free_cap_flush(prealloc_cf);
S
Sage Weil 已提交
2009 2010 2011 2012 2013 2014 2015
	return err;
}

/*
 * Verify that we have a lease on the given mask.  If not,
 * do a getattr against an mds.
 */
2016 2017
int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
		      int mask, bool force)
S
Sage Weil 已提交
2018
{
2019 2020
	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
Sage Weil 已提交
2021 2022 2023 2024 2025 2026 2027 2028
	struct ceph_mds_request *req;
	int err;

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

2029 2030
	dout("do_getattr inode %p mask %s mode 0%o\n",
	     inode, ceph_cap_string(mask), inode->i_mode);
2031
	if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
S
Sage Weil 已提交
2032 2033 2034 2035 2036
		return 0;

	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
	if (IS_ERR(req))
		return PTR_ERR(req);
2037 2038
	req->r_inode = inode;
	ihold(inode);
S
Sage Weil 已提交
2039 2040
	req->r_num_caps = 1;
	req->r_args.getattr.mask = cpu_to_le32(mask);
2041
	req->r_locked_page = locked_page;
S
Sage Weil 已提交
2042
	err = ceph_mdsc_do_request(mdsc, NULL, req);
2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053
	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
Sage Weil 已提交
2054 2055 2056 2057 2058 2059 2060 2061 2062 2063
	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.
 */
2064
int ceph_permission(struct inode *inode, int mask)
S
Sage Weil 已提交
2065
{
2066 2067
	int err;

2068
	if (mask & MAY_NOT_BLOCK)
2069 2070
		return -ECHILD;

2071
	err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
S
Sage Weil 已提交
2072 2073

	if (!err)
2074
		err = generic_permission(inode, mask);
S
Sage Weil 已提交
2075 2076 2077 2078 2079 2080 2081 2082 2083 2084
	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)
{
2085
	struct inode *inode = d_inode(dentry);
2086
	struct ceph_inode_info *ci = ceph_inode(inode);
S
Sage Weil 已提交
2087 2088
	int err;

2089
	err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
S
Sage Weil 已提交
2090 2091
	if (!err) {
		generic_fillattr(inode, stat);
Y
Yehuda Sadeh 已提交
2092
		stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
S
Sage Weil 已提交
2093 2094 2095 2096
		if (ceph_snap(inode) != CEPH_NOSNAP)
			stat->dev = ceph_snap(inode);
		else
			stat->dev = 0;
2097
		if (S_ISDIR(inode->i_mode)) {
2098 2099 2100 2101 2102
			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;
2103
			stat->blocks = 0;
S
Sage Weil 已提交
2104
			stat->blksize = 65536;
2105
		}
S
Sage Weil 已提交
2106 2107 2108
	}
	return err;
}