inode.c 59.1 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/xattr.h>
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#include <linux/posix_acl.h>
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#include <linux/random.h>
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#include <linux/sort.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,
	.listxattr = ceph_listxattr,
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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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	if (mds == -1) /* CDIR_AUTH_PARENT */
		mds = diri_auth;

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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 frag_tree_split_cmp(const void *l, const void *r)
{
	struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
	struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
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	return ceph_frag_compare(le32_to_cpu(ls->frag),
				 le32_to_cpu(rs->frag));
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}

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static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
{
	if (!frag)
		return f == ceph_frag_make(0, 0);
	if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
		return false;
	return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
}

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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);
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	struct ceph_inode_frag *frag, *prev_frag = NULL;
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	struct rb_node *rb_node;
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	unsigned i, split_by, nsplits;
	u32 id;
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	bool update = false;

	mutex_lock(&ci->i_fragtree_mutex);
	nsplits = le32_to_cpu(fragtree->nsplits);
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	if (nsplits != ci->i_fragtree_nsplits) {
		update = true;
	} else if (nsplits) {
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		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;

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	if (nsplits > 1) {
		sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
		     frag_tree_split_cmp, NULL);
	}

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	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);
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		split_by = le32_to_cpu(fragtree->splits[i].by);
		if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
			pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
			       "frag %x split by %d\n", ceph_vinop(inode),
			       i, nsplits, id, split_by);
			continue;
		}
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		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);
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			/* delete stale split/leaf node */
			if (frag->split_by > 0 ||
			    !is_frag_child(frag->frag, prev_frag)) {
				rb_erase(&frag->node, &ci->i_fragtree);
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				if (frag->split_by > 0)
					ci->i_fragtree_nsplits--;
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				kfree(frag);
			}
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			frag = NULL;
		}
		if (!frag) {
			frag = __get_or_create_frag(ci, id);
			if (IS_ERR(frag))
				continue;
		}
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		if (frag->split_by == 0)
			ci->i_fragtree_nsplits++;
		frag->split_by = split_by;
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		dout(" frag %x split by %d\n", frag->frag, frag->split_by);
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		prev_frag = frag;
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	}
	while (rb_node) {
		frag = rb_entry(rb_node, struct ceph_inode_frag, node);
		rb_node = rb_next(rb_node);
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		/* delete stale split/leaf node */
		if (frag->split_by > 0 ||
		    !is_frag_child(frag->frag, prev_frag)) {
			rb_erase(&frag->node, &ci->i_fragtree);
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			if (frag->split_by > 0)
				ci->i_fragtree_nsplits--;
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			kfree(frag);
		}
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	}
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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	RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
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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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	INIT_LIST_HEAD(&ci->i_cap_flush_list);
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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;

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	for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
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		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);
	}
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	ci->i_fragtree_nsplits = 0;
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	__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);
S
Sage Weil 已提交
570

Y
Yan, Zheng 已提交
571
	ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
572

N
Nick Piggin 已提交
573
	call_rcu(&inode->i_rcu, ceph_i_callback);
S
Sage Weil 已提交
574 575
}

Y
Yan, Zheng 已提交
576 577 578 579 580 581 582 583 584 585
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;
}

586 587 588 589 590 591 592 593
void ceph_evict_inode(struct inode *inode)
{
	/* wait unsafe sync writes */
	ceph_sync_write_wait(inode);
	truncate_inode_pages_final(&inode->i_data);
	clear_inode(inode);
}

594 595 596 597 598
static inline blkcnt_t calc_inode_blocks(u64 size)
{
	return (size + (1<<9) - 1) >> 9;
}

S
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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);
616 617 618 619
		if (size > 0 && S_ISDIR(inode->i_mode)) {
			pr_err("fill_file_size non-zero size for directory\n");
			size = 0;
		}
620
		i_size_write(inode, size);
621
		inode->i_blocks = calc_inode_blocks(size);
S
Sage Weil 已提交
622 623 624 625 626
		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;
Y
Yan, Zheng 已提交
627 628 629 630 631 632

			/* 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));
633 634 635 636 637 638
			/*
			 * 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
639 640
			if ((issued & (CEPH_CAP_FILE_CACHE|
				       CEPH_CAP_FILE_BUFFER)) ||
641 642
			    mapping_mapped(inode->i_mapping) ||
			    __ceph_caps_file_wanted(ci)) {
S
Sage Weil 已提交
643 644 645 646 647 648 649 650 651 652 653
				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;
	}
654 655 656 657

	if (queue_trunc)
		ceph_fscache_invalidate(inode);

S
Sage Weil 已提交
658 659 660 661 662 663 664 665 666 667 668 669
	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
670 671 672
		      CEPH_CAP_FILE_BUFFER|
		      CEPH_CAP_AUTH_EXCL|
		      CEPH_CAP_XATTR_EXCL)) {
S
Sage Weil 已提交
673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711
		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
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712
		/* we have no write|excl caps; whatever the MDS says is true */
S
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713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730
		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.
 */
731
static int fill_inode(struct inode *inode, struct page *locked_page,
S
Sage Weil 已提交
732 733 734 735 736 737
		      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)
{
738
	struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
S
Sage Weil 已提交
739 740
	struct ceph_mds_reply_inode *info = iinfo->in;
	struct ceph_inode_info *ci = ceph_inode(inode);
741
	int issued = 0, implemented, new_issued;
S
Sage Weil 已提交
742 743
	struct timespec mtime, atime, ctime;
	struct ceph_buffer *xattr_blob = NULL;
Y
Yan, Zheng 已提交
744
	struct ceph_string *pool_ns = NULL;
745
	struct ceph_cap *new_cap = NULL;
S
Sage Weil 已提交
746
	int err = 0;
747
	bool wake = false;
748 749
	bool queue_trunc = false;
	bool new_version = false;
Y
Yan, Zheng 已提交
750
	bool fill_inline = false;
S
Sage Weil 已提交
751 752 753 754 755

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

756 757 758 759
	/* 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
760 761 762 763 764 765
	/*
	 * 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
766
		xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
S
Sage Weil 已提交
767 768 769 770 771
		if (!xattr_blob)
			pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
			       iinfo->xattr_len);
	}

Y
Yan, Zheng 已提交
772 773 774 775
	if (iinfo->pool_ns_len > 0)
		pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
						     iinfo->pool_ns_len);

776
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
777 778 779

	/*
	 * provided version will be odd if inode value is projected,
780 781 782 783 784 785 786 787
	 * 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
788
	 */
789 790 791 792 793
	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
794 795
	issued = __ceph_caps_issued(ci, &implemented);
	issued |= implemented | __ceph_caps_dirty(ci);
796
	new_issued = ~issued & le32_to_cpu(info->cap.caps);
S
Sage Weil 已提交
797 798 799 800 801

	/* update inode */
	ci->i_version = le64_to_cpu(info->version);
	inode->i_version++;
	inode->i_rdev = le32_to_cpu(info->rdev);
802
	inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
S
Sage Weil 已提交
803

804 805
	if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
	    (issued & CEPH_CAP_AUTH_EXCL) == 0) {
S
Sage Weil 已提交
806
		inode->i_mode = le32_to_cpu(info->mode);
807 808
		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
809
		dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
810 811
		     from_kuid(&init_user_ns, inode->i_uid),
		     from_kgid(&init_user_ns, inode->i_gid));
S
Sage Weil 已提交
812 813
	}

814 815
	if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
	    (issued & CEPH_CAP_LINK_EXCL) == 0)
M
Miklos Szeredi 已提交
816
		set_nlink(inode, le32_to_cpu(info->nlink));
S
Sage Weil 已提交
817

818 819 820 821 822 823 824 825 826 827 828 829
	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))) {
830
		s64 old_pool = ci->i_layout.pool_id;
Y
Yan, Zheng 已提交
831 832
		struct ceph_string *old_ns;

833
		ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
Y
Yan, Zheng 已提交
834 835 836 837 838
		old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
					lockdep_is_held(&ci->i_ceph_lock));
		rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);

		if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
839 840
			ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;

Y
Yan, Zheng 已提交
841
		pool_ns = old_ns;
842

843 844 845 846 847 848 849 850 851 852 853 854
		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
855 856 857

	/* xattrs */
	/* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
858
	if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))  &&
S
Sage Weil 已提交
859 860 861 862 863 864 865 866
	    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
867
		ceph_forget_all_cached_acls(inode);
868
		xattr_blob = NULL;
S
Sage Weil 已提交
869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887
	}

	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) {
888
			u32 symlen = iinfo->symlink_len;
S
Sage Weil 已提交
889 890
			char *sym;

891
			spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
892

893 894 895 896 897 898 899
			if (symlen != i_size_read(inode)) {
				pr_err("fill_inode %llx.%llx BAD symlink "
					"size %lld\n", ceph_vinop(inode),
					i_size_read(inode));
				i_size_write(inode, symlen);
				inode->i_blocks = calc_inode_blocks(symlen);
			}
900

S
Sage Weil 已提交
901
			err = -ENOMEM;
902
			sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
S
Sage Weil 已提交
903 904 905
			if (!sym)
				goto out;

906
			spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
907 908 909 910 911
			if (!ci->i_symlink)
				ci->i_symlink = sym;
			else
				kfree(sym); /* lost a race */
		}
A
Al Viro 已提交
912
		inode->i_link = ci->i_symlink;
S
Sage Weil 已提交
913 914 915 916 917
		break;
	case S_IFDIR:
		inode->i_op = &ceph_dir_iops;
		inode->i_fop = &ceph_dir_fops;

918 919
		ci->i_dir_layout = iinfo->dir_layout;

S
Sage Weil 已提交
920 921 922 923 924 925 926 927 928 929 930 931 932 933 934
		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) {
935
			unsigned caps = le32_to_cpu(info->cap.caps);
S
Sage Weil 已提交
936 937
			ceph_add_cap(inode, session,
				     le64_to_cpu(info->cap.cap_id),
938
				     cap_fmode, caps,
S
Sage Weil 已提交
939 940 941 942
				     le32_to_cpu(info->cap.wanted),
				     le32_to_cpu(info->cap.seq),
				     le32_to_cpu(info->cap.mseq),
				     le64_to_cpu(info->cap.realm),
943
				     info->cap.flags, &new_cap);
944 945 946 947 948 949 950 951

			/* 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
952
				i_size_write(inode, 0);
953
				__ceph_dir_set_complete(ci,
Y
Yan, Zheng 已提交
954 955
					atomic64_read(&ci->i_release_count),
					atomic64_read(&ci->i_ordered_count));
956 957
			}

958
			wake = true;
S
Sage Weil 已提交
959 960 961 962 963 964 965
		} 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);
		}
966
	} else if (cap_fmode >= 0) {
967
		pr_warn("mds issued no caps on %llx.%llx\n",
968 969
			   ceph_vinop(inode));
		__ceph_get_fmode(ci, cap_fmode);
S
Sage Weil 已提交
970
	}
Y
Yan, Zheng 已提交
971 972 973 974 975 976

	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 &&
977 978
		    (locked_page ||
		     (le32_to_cpu(info->cap.caps) & cache_caps)))
Y
Yan, Zheng 已提交
979 980 981
			fill_inline = true;
	}

982
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
983

Y
Yan, Zheng 已提交
984
	if (fill_inline)
985
		ceph_fill_inline_data(inode, locked_page,
Y
Yan, Zheng 已提交
986 987
				      iinfo->inline_data, iinfo->inline_len);

988 989 990
	if (wake)
		wake_up_all(&ci->i_cap_wq);

S
Sage Weil 已提交
991 992
	/* queue truncate if we saw i_size decrease */
	if (queue_trunc)
993
		ceph_queue_vmtruncate(inode);
S
Sage Weil 已提交
994 995

	/* populate frag tree */
996 997
	if (S_ISDIR(inode->i_mode))
		ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
S
Sage Weil 已提交
998 999 1000 1001 1002 1003 1004

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

	err = 0;
out:
1005 1006
	if (new_cap)
		ceph_put_cap(mdsc, new_cap);
S
Sage Weil 已提交
1007 1008
	if (xattr_blob)
		ceph_buffer_put(xattr_blob);
Y
Yan, Zheng 已提交
1009
	ceph_put_string(pool_ns);
S
Sage Weil 已提交
1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027
	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;

	spin_lock(&dentry->d_lock);
S
Sage Weil 已提交
1028 1029
	dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
	     dentry, duration, ttl);
S
Sage Weil 已提交
1030 1031

	/* make lease_rdcache_gen match directory */
1032
	dir = d_inode(dentry->d_parent);
A
Al Viro 已提交
1033 1034 1035 1036 1037

	/* only track leases on regular dentries */
	if (ceph_snap(dir) != CEPH_NOSNAP)
		goto out_unlock;

S
Sage Weil 已提交
1038 1039
	di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;

S
Sage Weil 已提交
1040
	if (duration == 0)
S
Sage Weil 已提交
1041 1042 1043
		goto out_unlock;

	if (di->lease_gen == session->s_cap_gen &&
M
Miklos Szeredi 已提交
1044
	    time_before(ttl, di->time))
S
Sage Weil 已提交
1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057
		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;
M
Miklos Szeredi 已提交
1058
	di->time = ttl;
S
Sage Weil 已提交
1059 1060 1061 1062 1063 1064 1065 1066 1067
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.
 */
1068
static struct dentry *splice_dentry(struct dentry *dn, struct inode *in)
S
Sage Weil 已提交
1069 1070 1071
{
	struct dentry *realdn;

1072
	BUG_ON(d_inode(dn));
S
Sage Weil 已提交
1073

S
Sage Weil 已提交
1074 1075 1076
	/* dn must be unhashed */
	if (!d_unhashed(dn))
		d_drop(dn);
1077
	realdn = d_splice_alias(in, dn);
S
Sage Weil 已提交
1078
	if (IS_ERR(realdn)) {
1079 1080
		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
1081 1082 1083 1084 1085
		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
1086 1087
		     dn, d_count(dn),
		     realdn, d_count(realdn),
1088
		     d_inode(realdn), ceph_vinop(d_inode(realdn)));
S
Sage Weil 已提交
1089 1090 1091 1092 1093
		dput(dn);
		dn = realdn;
	} else {
		BUG_ON(!ceph_dentry(dn));
		dout("dn %p attached to %p ino %llx.%llx\n",
1094
		     dn, d_inode(dn), ceph_vinop(d_inode(dn)));
S
Sage Weil 已提交
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110
	}
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).
 */
1111
int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
S
Sage Weil 已提交
1112
{
1113
	struct ceph_mds_session *session = req->r_session;
S
Sage Weil 已提交
1114 1115 1116
	struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
	struct inode *in = NULL;
	struct ceph_vino vino;
1117
	struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
S
Sage Weil 已提交
1118 1119 1120 1121 1122 1123 1124
	int err = 0;

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

	if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
		dout("fill_trace reply is empty!\n");
1125
		if (rinfo->head->result == 0 && req->r_parent)
1126
			ceph_invalidate_dir_request(req);
S
Sage Weil 已提交
1127 1128 1129 1130
		return 0;
	}

	if (rinfo->head->is_dentry) {
1131
		struct inode *dir = req->r_parent;
1132

1133
		if (dir) {
1134 1135
			err = fill_inode(dir, NULL,
					 &rinfo->diri, rinfo->dirfrag,
1136 1137 1138
					 session, req->r_request_started, -1,
					 &req->r_caps_reservation);
			if (err < 0)
1139
				goto done;
1140 1141 1142
		} else {
			WARN_ON_ONCE(1);
		}
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155

		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;
1156
			dname.hash = full_name_hash(parent, dname.name, dname.len);
1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
			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;
				}
A
Al Viro 已提交
1173
				err = 0;
1174 1175 1176
			} else if (d_really_is_positive(dn) &&
				   (ceph_ino(d_inode(dn)) != vino.ino ||
				    ceph_snap(d_inode(dn)) != vino.snap)) {
1177
				dout(" dn %p points to wrong inode %p\n",
1178
				     dn, d_inode(dn));
1179 1180 1181 1182 1183 1184 1185 1186
				d_delete(dn);
				dput(dn);
				goto retry_lookup;
			}

			req->r_dentry = dn;
			dput(parent);
		}
1187 1188
	}

1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
	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;

1200
		err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1201
				session, req->r_request_started,
1202 1203
				(!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
				rinfo->head->result == 0) ?  req->r_fmode : -1,
1204 1205 1206 1207 1208 1209 1210 1211
				&req->r_caps_reservation);
		if (err < 0) {
			pr_err("fill_inode badness %p %llx.%llx\n",
				in, ceph_vinop(in));
			goto done;
		}
	}

1212 1213 1214 1215
	/*
	 * ignore null lease/binding on snapdir ENOENT, or else we
	 * will have trouble splicing in the virtual snapdir later
	 */
1216 1217 1218
	if (rinfo->head->is_dentry &&
            !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
	    test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1219
	    (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1220
					       fsc->mount_options->snapdir_name,
1221
					       req->r_dentry->d_name.len))) {
S
Sage Weil 已提交
1222 1223 1224 1225 1226
		/*
		 * lookup link rename   : null -> possibly existing inode
		 * mknod symlink mkdir  : null -> new inode
		 * unlink               : linked -> null
		 */
1227
		struct inode *dir = req->r_parent;
S
Sage Weil 已提交
1228 1229 1230 1231 1232
		struct dentry *dn = req->r_dentry;
		bool have_dir_cap, have_lease;

		BUG_ON(!dn);
		BUG_ON(!dir);
1233
		BUG_ON(d_inode(dn->d_parent) != dir);
S
Sage Weil 已提交
1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245
		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
1246
			le32_to_cpu(rinfo->dlease->duration_ms);
S
Sage Weil 已提交
1247 1248 1249 1250 1251
		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) {
1252 1253 1254
			struct inode *olddir = req->r_old_dentry_dir;
			BUG_ON(!olddir);

A
Al Viro 已提交
1255
			dout(" src %p '%pd' dst %p '%pd'\n",
S
Sage Weil 已提交
1256
			     req->r_old_dentry,
A
Al Viro 已提交
1257 1258
			     req->r_old_dentry,
			     dn, dn);
S
Sage Weil 已提交
1259 1260
			dout("fill_trace doing d_move %p -> %p\n",
			     req->r_old_dentry, dn);
S
Sage Weil 已提交
1261

Y
Yan, Zheng 已提交
1262 1263 1264 1265
			/* d_move screws up sibling dentries' offsets */
			ceph_dir_clear_ordered(dir);
			ceph_dir_clear_ordered(olddir);

S
Sage Weil 已提交
1266
			d_move(req->r_old_dentry, dn);
A
Al Viro 已提交
1267 1268
			dout(" src %p '%pd' dst %p '%pd'\n",
			     req->r_old_dentry,
S
Sage Weil 已提交
1269
			     req->r_old_dentry,
A
Al Viro 已提交
1270
			     dn, dn);
1271

1272 1273
			/* ensure target dentry is invalidated, despite
			   rehashing bug in vfs_rename_dir */
1274 1275
			ceph_invalidate_dentry_lease(dn);

1276
			dout("dn %p gets new offset %lld\n", req->r_old_dentry,
S
Sage Weil 已提交
1277
			     ceph_dentry(req->r_old_dentry)->offset);
1278

S
Sage Weil 已提交
1279 1280 1281 1282 1283 1284
			dn = req->r_old_dentry;  /* use old_dentry */
		}

		/* null dentry? */
		if (!rinfo->head->is_target) {
			dout("fill_trace null dentry\n");
1285
			if (d_really_is_positive(dn)) {
1286
				ceph_dir_clear_ordered(dir);
S
Sage Weil 已提交
1287 1288
				dout("d_delete %p\n", dn);
				d_delete(dn);
1289 1290
			} else if (have_lease) {
				if (d_unhashed(dn))
1291
					d_add(dn, NULL);
S
Sage Weil 已提交
1292 1293 1294 1295 1296 1297 1298 1299
				update_dentry_lease(dn, rinfo->dlease,
						    session,
						    req->r_request_started);
			}
			goto done;
		}

		/* attach proper inode */
1300
		if (d_really_is_negative(dn)) {
1301
			ceph_dir_clear_ordered(dir);
1302
			ihold(in);
1303
			dn = splice_dentry(dn, in);
S
Sage Weil 已提交
1304 1305 1306 1307 1308
			if (IS_ERR(dn)) {
				err = PTR_ERR(dn);
				goto done;
			}
			req->r_dentry = dn;  /* may have spliced */
1309
		} else if (d_really_is_positive(dn) && d_inode(dn) != in) {
S
Sage Weil 已提交
1310
			dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1311
			     dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1312
			     ceph_vinop(in));
1313
			d_invalidate(dn);
S
Sage Weil 已提交
1314 1315 1316 1317 1318 1319 1320
			have_lease = false;
		}

		if (have_lease)
			update_dentry_lease(dn, rinfo->dlease, session,
					    req->r_request_started);
		dout(" final dn %p\n", dn);
1321 1322 1323
	} else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
		    req->r_op == CEPH_MDS_OP_MKSNAP) &&
		   !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
S
Sage Weil 已提交
1324
		struct dentry *dn = req->r_dentry;
1325
		struct inode *dir = req->r_parent;
S
Sage Weil 已提交
1326 1327 1328

		/* fill out a snapdir LOOKUPSNAP dentry */
		BUG_ON(!dn);
1329 1330
		BUG_ON(!dir);
		BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
S
Sage Weil 已提交
1331
		dout(" linking snapped dir %p to dn %p\n", in, dn);
1332
		ceph_dir_clear_ordered(dir);
1333
		ihold(in);
1334
		dn = splice_dentry(dn, in);
S
Sage Weil 已提交
1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348
		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.
 */
1349 1350 1351 1352 1353 1354 1355
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++) {
1356
		struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1357 1358 1359 1360
		struct ceph_vino vino;
		struct inode *in;
		int rc;

1361 1362
		vino.ino = le64_to_cpu(rde->inode.in->ino);
		vino.snap = le64_to_cpu(rde->inode.in->snapid);
1363 1364 1365 1366 1367 1368 1369

		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;
		}
1370
		rc = fill_inode(in, NULL, &rde->inode, NULL, session,
1371 1372 1373 1374 1375 1376
				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;
		}
Y
Yan, Zheng 已提交
1377
		iput(in);
1378 1379 1380 1381 1382
	}

	return err;
}

Y
Yan, Zheng 已提交
1383 1384 1385 1386
void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
{
	if (ctl->page) {
		kunmap(ctl->page);
1387
		put_page(ctl->page);
Y
Yan, Zheng 已提交
1388 1389 1390 1391 1392 1393 1394 1395 1396
		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);
1397
	unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
Y
Yan, Zheng 已提交
1398 1399 1400 1401 1402
	unsigned idx = ctl->index % nsize;
	pgoff_t pgoff = ctl->index / nsize;

	if (!ctl->page || pgoff != page_index(ctl->page)) {
		ceph_readdir_cache_release(ctl);
1403 1404 1405 1406
		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
1407 1408
		if (!ctl->page) {
			ctl->index = -1;
1409
			return idx == 0 ? -ENOMEM : 0;
Y
Yan, Zheng 已提交
1410 1411 1412 1413 1414
		}
		/* reading/filling the cache are serialized by
		 * i_mutex, no need to use page lock */
		unlock_page(ctl->page);
		ctl->dentries = kmap(ctl->page);
1415
		if (idx == 0)
1416
			memset(ctl->dentries, 0, PAGE_SIZE);
Y
Yan, Zheng 已提交
1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430
	}

	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
1431 1432 1433 1434
int ceph_readdir_prepopulate(struct ceph_mds_request *req,
			     struct ceph_mds_session *session)
{
	struct dentry *parent = req->r_dentry;
1435
	struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
S
Sage Weil 已提交
1436 1437 1438 1439
	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
1440
	int err = 0, skipped = 0, ret, i;
S
Sage Weil 已提交
1441 1442
	struct inode *snapdir = NULL;
	struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1443
	u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1444 1445
	u32 last_hash = 0;
	u32 fpos_offset;
Y
Yan, Zheng 已提交
1446 1447
	struct ceph_readdir_cache_control cache_ctl = {};

1448
	if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
Y
Yan, Zheng 已提交
1449
		return readdir_prepopulate_inodes_only(req, session);
1450

1451 1452 1453 1454 1455 1456
	if (rinfo->hash_order && req->r_path2) {
		last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
					  req->r_path2, strlen(req->r_path2));
		last_hash = ceph_frag_value(last_hash);
	}

1457 1458 1459 1460 1461
	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);
1462
		if (!rinfo->hash_order)
Y
Yan, Zheng 已提交
1463
			req->r_readdir_offset = 2;
1464
	}
S
Sage Weil 已提交
1465 1466

	if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1467
		snapdir = ceph_get_snapdir(d_inode(parent));
S
Sage Weil 已提交
1468 1469 1470 1471 1472 1473 1474
		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)
1475
			ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
S
Sage Weil 已提交
1476 1477
	}

1478 1479
	if (ceph_frag_is_leftmost(frag) && req->r_readdir_offset == 2 &&
	    !(rinfo->hash_order && req->r_path2)) {
Y
Yan, Zheng 已提交
1480 1481 1482 1483 1484 1485 1486 1487
		/* note dir version at start of readdir so we can tell
		 * if any dentries get dropped */
		req->r_dir_release_cnt = atomic64_read(&ci->i_release_count);
		req->r_dir_ordered_cnt = atomic64_read(&ci->i_ordered_count);
		req->r_readdir_cache_idx = 0;
	}

	cache_ctl.index = req->r_readdir_cache_idx;
1488
	fpos_offset = req->r_readdir_offset;
Y
Yan, Zheng 已提交
1489

1490
	/* FIXME: release caps/leases if error occurs */
S
Sage Weil 已提交
1491
	for (i = 0; i < rinfo->dir_nr; i++) {
1492
		struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
S
Sage Weil 已提交
1493 1494
		struct ceph_vino vino;

1495 1496
		dname.name = rde->name;
		dname.len = rde->name_len;
1497
		dname.hash = full_name_hash(parent, dname.name, dname.len);
S
Sage Weil 已提交
1498

1499 1500
		vino.ino = le64_to_cpu(rde->inode.in->ino);
		vino.snap = le64_to_cpu(rde->inode.in->snapid);
S
Sage Weil 已提交
1501

1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512
		if (rinfo->hash_order) {
			u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
						 rde->name, rde->name_len);
			hash = ceph_frag_value(hash);
			if (hash != last_hash)
				fpos_offset = 2;
			last_hash = hash;
			rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
		} else {
			rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
		}
S
Sage Weil 已提交
1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527

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;
			}
1528 1529 1530
		} 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
1531
			dout(" dn %p points to wrong inode %p\n",
1532
			     dn, d_inode(dn));
S
Sage Weil 已提交
1533 1534 1535 1536 1537 1538
			d_delete(dn);
			dput(dn);
			goto retry_lookup;
		}

		/* inode */
1539 1540
		if (d_really_is_positive(dn)) {
			in = d_inode(dn);
S
Sage Weil 已提交
1541 1542
		} else {
			in = ceph_get_inode(parent->d_sb, vino);
1543
			if (IS_ERR(in)) {
S
Sage Weil 已提交
1544
				dout("new_inode badness\n");
1545
				d_drop(dn);
S
Sage Weil 已提交
1546
				dput(dn);
1547
				err = PTR_ERR(in);
S
Sage Weil 已提交
1548 1549 1550 1551
				goto out;
			}
		}

1552
		ret = fill_inode(in, NULL, &rde->inode, NULL, session,
Y
Yan, Zheng 已提交
1553 1554 1555
				 req->r_request_started, -1,
				 &req->r_caps_reservation);
		if (ret < 0) {
S
Sage Weil 已提交
1556
			pr_err("fill_inode badness on %p\n", in);
1557
			if (d_really_is_negative(dn))
1558 1559
				iput(in);
			d_drop(dn);
Y
Yan, Zheng 已提交
1560
			err = ret;
1561
			goto next_item;
S
Sage Weil 已提交
1562
		}
1563

1564
		if (d_really_is_negative(dn)) {
Y
Yan, Zheng 已提交
1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575
			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
1576 1577 1578
			if (IS_ERR(realdn)) {
				err = PTR_ERR(realdn);
				d_drop(dn);
1579 1580 1581
				dn = NULL;
				goto next_item;
			}
Y
Yan, Zheng 已提交
1582
			dn = realdn;
1583 1584
		}

1585
		ceph_dentry(dn)->offset = rde->offset;
1586

1587
		update_dentry_lease(dn, rde->lease, req->r_session,
1588
				    req->r_request_started);
Y
Yan, Zheng 已提交
1589

Y
Yan, Zheng 已提交
1590
		if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
Y
Yan, Zheng 已提交
1591 1592 1593 1594 1595
			ret = fill_readdir_cache(d_inode(parent), dn,
						 &cache_ctl, req);
			if (ret < 0)
				err = ret;
		}
1596 1597 1598
next_item:
		if (dn)
			dput(dn);
S
Sage Weil 已提交
1599 1600
	}
out:
Y
Yan, Zheng 已提交
1601
	if (err == 0 && skipped == 0) {
1602
		set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
Y
Yan, Zheng 已提交
1603 1604 1605
		req->r_readdir_cache_idx = cache_ctl.index;
	}
	ceph_readdir_cache_release(&cache_ctl);
S
Sage Weil 已提交
1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618
	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;

1619
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1620
	dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1621
	i_size_write(inode, size);
1622
	inode->i_blocks = calc_inode_blocks(size);
S
Sage Weil 已提交
1623 1624 1625 1626 1627 1628

	/* 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;

1629
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1630 1631 1632 1633 1634 1635 1636
	return ret;
}

/*
 * Write back inode data in a worker thread.  (This can't be done
 * in the message handler context.)
 */
1637 1638
void ceph_queue_writeback(struct inode *inode)
{
1639
	ihold(inode);
1640 1641
	if (queue_work(ceph_inode_to_client(inode)->wb_wq,
		       &ceph_inode(inode)->i_wb_work)) {
1642
		dout("ceph_queue_writeback %p\n", inode);
1643
	} else {
1644
		dout("ceph_queue_writeback %p failed\n", inode);
1645
		iput(inode);
1646 1647 1648 1649
	}
}

static void ceph_writeback_work(struct work_struct *work)
S
Sage Weil 已提交
1650 1651 1652 1653 1654 1655 1656 1657 1658 1659
{
	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);
}

1660 1661 1662 1663 1664
/*
 * queue an async invalidation
 */
void ceph_queue_invalidate(struct inode *inode)
{
1665
	ihold(inode);
1666 1667 1668 1669 1670
	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);
1671
		iput(inode);
1672 1673 1674
	}
}

S
Sage Weil 已提交
1675 1676 1677 1678
/*
 * Invalidate inode pages in a worker thread.  (This can't be done
 * in the message handler context.)
 */
1679
static void ceph_invalidate_work(struct work_struct *work)
S
Sage Weil 已提交
1680 1681 1682 1683
{
	struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
						  i_pg_inv_work);
	struct inode *inode = &ci->vfs_inode;
1684
	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
S
Sage Weil 已提交
1685 1686 1687
	u32 orig_gen;
	int check = 0;

Y
Yan, Zheng 已提交
1688
	mutex_lock(&ci->i_truncate_mutex);
1689

1690
	if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1691 1692 1693 1694 1695 1696 1697 1698
		pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
				    inode, ceph_ino(inode));
		mapping_set_error(inode->i_mapping, -EIO);
		truncate_pagecache(inode, 0);
		mutex_unlock(&ci->i_truncate_mutex);
		goto out;
	}

1699
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1700 1701
	dout("invalidate_pages %p gen %d revoking %d\n", inode,
	     ci->i_rdcache_gen, ci->i_rdcache_revoking);
1702
	if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
Y
Yan, Zheng 已提交
1703 1704
		if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
			check = 1;
1705
		spin_unlock(&ci->i_ceph_lock);
Y
Yan, Zheng 已提交
1706
		mutex_unlock(&ci->i_truncate_mutex);
S
Sage Weil 已提交
1707 1708 1709
		goto out;
	}
	orig_gen = ci->i_rdcache_gen;
1710
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1711

1712 1713 1714
	if (invalidate_inode_pages2(inode->i_mapping) < 0) {
		pr_err("invalidate_pages %p fails\n", inode);
	}
S
Sage Weil 已提交
1715

1716
	spin_lock(&ci->i_ceph_lock);
1717 1718
	if (orig_gen == ci->i_rdcache_gen &&
	    orig_gen == ci->i_rdcache_revoking) {
S
Sage Weil 已提交
1719 1720
		dout("invalidate_pages %p gen %d successful\n", inode,
		     ci->i_rdcache_gen);
1721
		ci->i_rdcache_revoking--;
S
Sage Weil 已提交
1722 1723
		check = 1;
	} else {
1724 1725 1726
		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
1727 1728
		if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
			check = 1;
S
Sage Weil 已提交
1729
	}
1730
	spin_unlock(&ci->i_ceph_lock);
Y
Yan, Zheng 已提交
1731
	mutex_unlock(&ci->i_truncate_mutex);
Y
Yan, Zheng 已提交
1732
out:
S
Sage Weil 已提交
1733 1734 1735 1736 1737 1738 1739
	if (check)
		ceph_check_caps(ci, 0, NULL);
	iput(inode);
}


/*
1740
 * called by trunc_wq;
S
Sage Weil 已提交
1741 1742 1743
 *
 * We also truncate in a separate thread as well.
 */
1744
static void ceph_vmtruncate_work(struct work_struct *work)
S
Sage Weil 已提交
1745 1746 1747 1748 1749 1750
{
	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
1751
	__ceph_do_pending_vmtruncate(inode);
S
Sage Weil 已提交
1752 1753 1754
	iput(inode);
}

1755 1756 1757 1758 1759 1760 1761 1762
/*
 * 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);

1763
	ihold(inode);
1764

1765
	if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1766 1767 1768 1769 1770
		       &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);
1771
		iput(inode);
1772 1773 1774
	}
}

S
Sage Weil 已提交
1775 1776 1777 1778
/*
 * Make sure any pending truncation is applied before doing anything
 * that may depend on it.
 */
Y
Yan, Zheng 已提交
1779
void __ceph_do_pending_vmtruncate(struct inode *inode)
S
Sage Weil 已提交
1780 1781 1782
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	u64 to;
1783
	int wrbuffer_refs, finish = 0;
S
Sage Weil 已提交
1784

Y
Yan, Zheng 已提交
1785
	mutex_lock(&ci->i_truncate_mutex);
S
Sage Weil 已提交
1786
retry:
1787
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1788 1789
	if (ci->i_truncate_pending == 0) {
		dout("__do_pending_vmtruncate %p none pending\n", inode);
1790
		spin_unlock(&ci->i_ceph_lock);
Y
Yan, Zheng 已提交
1791
		mutex_unlock(&ci->i_truncate_mutex);
S
Sage Weil 已提交
1792 1793 1794 1795 1796 1797 1798 1799 1800 1801
		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);
1802
		spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1803 1804 1805 1806 1807
		filemap_write_and_wait_range(&inode->i_data, 0,
					     inode->i_sb->s_maxbytes);
		goto retry;
	}

Y
Yan, Zheng 已提交
1808 1809 1810
	/* there should be no reader or writer */
	WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);

S
Sage Weil 已提交
1811 1812 1813 1814
	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);
1815
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1816

1817
	truncate_pagecache(inode, to);
S
Sage Weil 已提交
1818

1819
	spin_lock(&ci->i_ceph_lock);
1820 1821 1822 1823
	if (to == ci->i_truncate_size) {
		ci->i_truncate_pending = 0;
		finish = 1;
	}
1824
	spin_unlock(&ci->i_ceph_lock);
1825 1826
	if (!finish)
		goto retry;
S
Sage Weil 已提交
1827

Y
Yan, Zheng 已提交
1828 1829
	mutex_unlock(&ci->i_truncate_mutex);

S
Sage Weil 已提交
1830 1831
	if (wrbuffer_refs == 0)
		ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1832 1833

	wake_up_all(&ci->i_cap_wq);
S
Sage Weil 已提交
1834 1835 1836 1837 1838 1839
}

/*
 * symlinks
 */
static const struct inode_operations ceph_symlink_iops = {
1840
	.get_link = simple_get_link,
Y
Yan, Zheng 已提交
1841 1842 1843
	.setattr = ceph_setattr,
	.getattr = ceph_getattr,
	.listxattr = ceph_listxattr,
S
Sage Weil 已提交
1844 1845
};

1846
int __ceph_setattr(struct inode *inode, struct iattr *attr)
S
Sage Weil 已提交
1847 1848 1849 1850
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	const unsigned int ia_valid = attr->ia_valid;
	struct ceph_mds_request *req;
1851
	struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1852
	struct ceph_cap_flush *prealloc_cf;
S
Sage Weil 已提交
1853 1854 1855 1856
	int issued;
	int release = 0, dirtied = 0;
	int mask = 0;
	int err = 0;
1857
	int inode_dirty_flags = 0;
1858
	bool lock_snap_rwsem = false;
S
Sage Weil 已提交
1859

1860 1861 1862 1863
	prealloc_cf = ceph_alloc_cap_flush();
	if (!prealloc_cf)
		return -ENOMEM;

S
Sage Weil 已提交
1864 1865
	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
				       USE_AUTH_MDS);
1866 1867
	if (IS_ERR(req)) {
		ceph_free_cap_flush(prealloc_cf);
S
Sage Weil 已提交
1868
		return PTR_ERR(req);
1869
	}
S
Sage Weil 已提交
1870

1871
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
1872
	issued = __ceph_caps_issued(ci, NULL);
1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884

	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
1885 1886 1887 1888
	dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));

	if (ia_valid & ATTR_UID) {
		dout("setattr %p uid %d -> %d\n", inode,
1889 1890
		     from_kuid(&init_user_ns, inode->i_uid),
		     from_kuid(&init_user_ns, attr->ia_uid));
S
Sage Weil 已提交
1891 1892 1893 1894
		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 ||
1895 1896 1897
			   !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
1898 1899 1900 1901 1902 1903
			mask |= CEPH_SETATTR_UID;
			release |= CEPH_CAP_AUTH_SHARED;
		}
	}
	if (ia_valid & ATTR_GID) {
		dout("setattr %p gid %d -> %d\n", inode,
1904 1905
		     from_kgid(&init_user_ns, inode->i_gid),
		     from_kgid(&init_user_ns, attr->ia_gid));
S
Sage Weil 已提交
1906 1907 1908 1909
		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 ||
1910 1911 1912
			   !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
1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924
			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
1925
			inode->i_mode = attr->ia_mode;
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 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980
			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) {
1981
			i_size_write(inode, attr->ia_size);
1982
			inode->i_blocks = calc_inode_blocks(attr->ia_size);
S
Sage Weil 已提交
1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
			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) {
2026 2027
		inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
							   &prealloc_cf);
2028
		inode->i_ctime = current_time(inode);
S
Sage Weil 已提交
2029 2030 2031
	}

	release &= issued;
2032
	spin_unlock(&ci->i_ceph_lock);
2033 2034
	if (lock_snap_rwsem)
		up_read(&mdsc->snap_rwsem);
S
Sage Weil 已提交
2035

2036 2037 2038
	if (inode_dirty_flags)
		__mark_inode_dirty(inode, inode_dirty_flags);

G
Guangliang Zhao 已提交
2039
	if (ia_valid & ATTR_MODE) {
2040
		err = posix_acl_chmod(inode, attr->ia_mode);
G
Guangliang Zhao 已提交
2041 2042 2043 2044
		if (err)
			goto out_put;
	}

S
Sage Weil 已提交
2045
	if (mask) {
2046 2047
		req->r_inode = inode;
		ihold(inode);
S
Sage Weil 已提交
2048 2049 2050
		req->r_inode_drop = release;
		req->r_args.setattr.mask = cpu_to_le32(mask);
		req->r_num_caps = 1;
2051
		err = ceph_mdsc_do_request(mdsc, NULL, req);
S
Sage Weil 已提交
2052 2053 2054 2055 2056
	}
	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
2057 2058
	if (mask & CEPH_SETATTR_SIZE)
		__ceph_do_pending_vmtruncate(inode);
2059
	ceph_free_cap_flush(prealloc_cf);
S
Sage Weil 已提交
2060
	return err;
G
Guangliang Zhao 已提交
2061
out_put:
S
Sage Weil 已提交
2062
	ceph_mdsc_put_request(req);
2063
	ceph_free_cap_flush(prealloc_cf);
S
Sage Weil 已提交
2064 2065 2066
	return err;
}

2067 2068 2069 2070 2071
/*
 * setattr
 */
int ceph_setattr(struct dentry *dentry, struct iattr *attr)
{
2072 2073 2074 2075 2076 2077
	struct inode *inode = d_inode(dentry);
	int err;

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

2078
	err = setattr_prepare(dentry, attr);
2079 2080 2081 2082
	if (err != 0)
		return err;

	return __ceph_setattr(inode, attr);
2083 2084
}

S
Sage Weil 已提交
2085 2086 2087 2088
/*
 * Verify that we have a lease on the given mask.  If not,
 * do a getattr against an mds.
 */
2089 2090
int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
		      int mask, bool force)
S
Sage Weil 已提交
2091
{
2092 2093
	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
2094 2095 2096 2097 2098 2099 2100 2101
	struct ceph_mds_request *req;
	int err;

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

2102 2103
	dout("do_getattr inode %p mask %s mode 0%o\n",
	     inode, ceph_cap_string(mask), inode->i_mode);
2104
	if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
S
Sage Weil 已提交
2105 2106 2107 2108 2109
		return 0;

	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
	if (IS_ERR(req))
		return PTR_ERR(req);
2110 2111
	req->r_inode = inode;
	ihold(inode);
S
Sage Weil 已提交
2112 2113
	req->r_num_caps = 1;
	req->r_args.getattr.mask = cpu_to_le32(mask);
2114
	req->r_locked_page = locked_page;
S
Sage Weil 已提交
2115
	err = ceph_mdsc_do_request(mdsc, NULL, req);
2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126
	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
2127 2128 2129 2130 2131 2132 2133 2134 2135 2136
	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.
 */
2137
int ceph_permission(struct inode *inode, int mask)
S
Sage Weil 已提交
2138
{
2139 2140
	int err;

2141
	if (mask & MAY_NOT_BLOCK)
2142 2143
		return -ECHILD;

2144
	err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
S
Sage Weil 已提交
2145 2146

	if (!err)
2147
		err = generic_permission(inode, mask);
S
Sage Weil 已提交
2148 2149 2150 2151 2152 2153 2154 2155 2156 2157
	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)
{
2158
	struct inode *inode = d_inode(dentry);
2159
	struct ceph_inode_info *ci = ceph_inode(inode);
S
Sage Weil 已提交
2160 2161
	int err;

2162
	err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
S
Sage Weil 已提交
2163 2164
	if (!err) {
		generic_fillattr(inode, stat);
Y
Yehuda Sadeh 已提交
2165
		stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
S
Sage Weil 已提交
2166 2167 2168 2169
		if (ceph_snap(inode) != CEPH_NOSNAP)
			stat->dev = ceph_snap(inode);
		else
			stat->dev = 0;
2170
		if (S_ISDIR(inode->i_mode)) {
2171 2172 2173 2174 2175
			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;
2176
			stat->blocks = 0;
S
Sage Weil 已提交
2177
			stat->blksize = 65536;
2178
		}
S
Sage Weil 已提交
2179 2180 2181
	}
	return err;
}