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Commit d9df2783 authored by Yan, Zheng's avatar Yan, Zheng
Browse files

ceph: pre-allocate ceph_cap struct for ceph_add_cap() 



So that ceph_add_cap() can be used while i_ceph_lock is locked.
This simplifies the code that handle cap import/export.

Signed-off-by: default avatarYan, Zheng <zheng.z.yan@intel.com>
parent f98a128a

fs/ceph/caps.c

+39 −42
Original line number Diff line number Diff line
@@ -221,7 +221,7 @@ int ceph_unreserve_caps(struct ceph_mds_client *mdsc, 
	return 0;

}



static struct ceph_cap *get_cap(struct ceph_mds_client *mdsc,

struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,

			      struct ceph_cap_reservation *ctx)

{

	struct ceph_cap *cap = NULL;
@@ -508,15 +508,14 @@ static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap, 
 * it is < 0.  (This is so we can atomically add the cap and add an

 * open file reference to it.)

 */

int ceph_add_cap(struct inode *inode,

void ceph_add_cap(struct inode *inode,

		  struct ceph_mds_session *session, u64 cap_id,

		  int fmode, unsigned issued, unsigned wanted,

		  unsigned seq, unsigned mseq, u64 realmino, int flags,

		 struct ceph_cap_reservation *caps_reservation)

		  struct ceph_cap **new_cap)

{

	struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;

	struct ceph_inode_info *ci = ceph_inode(inode);

	struct ceph_cap *new_cap = NULL;

	struct ceph_cap *cap;

	int mds = session->s_mds;

	int actual_wanted;
@@ -531,20 +530,10 @@ int ceph_add_cap(struct inode *inode, 
	if (fmode >= 0)

		wanted |= ceph_caps_for_mode(fmode);



retry:

	spin_lock(&ci->i_ceph_lock);

	cap = __get_cap_for_mds(ci, mds);

	if (!cap) {

		if (new_cap) {

			cap = new_cap;

			new_cap = NULL;

		} else {

			spin_unlock(&ci->i_ceph_lock);

			new_cap = get_cap(mdsc, caps_reservation);

			if (new_cap == NULL)

				return -ENOMEM;

			goto retry;

		}

		cap = *new_cap;

		*new_cap = NULL;



		cap->issued = 0;

		cap->implemented = 0;
@@ -562,9 +551,6 @@ int ceph_add_cap(struct inode *inode, 
		session->s_nr_caps++;

		spin_unlock(&session->s_cap_lock);

	} else {

		if (new_cap)

			ceph_put_cap(mdsc, new_cap);



		/*

		 * auth mds of the inode changed. we received the cap export

		 * message, but still haven't received the cap import message.
@@ -626,7 +612,6 @@ int ceph_add_cap(struct inode *inode, 
			ci->i_auth_cap = cap;

			cap->mds_wanted = wanted;

		}

		ci->i_cap_exporting_issued = 0;

	} else {

		WARN_ON(ci->i_auth_cap == cap);

	}
@@ -648,9 +633,6 @@ int ceph_add_cap(struct inode *inode, 


	if (fmode >= 0)

		__ceph_get_fmode(ci, fmode);

	spin_unlock(&ci->i_ceph_lock);

	wake_up_all(&ci->i_cap_wq);

	return 0;

}



/*
@@ -685,7 +667,7 @@ static int __cap_is_valid(struct ceph_cap *cap) 
 */

int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)

{

	int have = ci->i_snap_caps | ci->i_cap_exporting_issued;

	int have = ci->i_snap_caps;

	struct ceph_cap *cap;

	struct rb_node *p;
@@ -900,7 +882,7 @@ int __ceph_caps_mds_wanted(struct ceph_inode_info *ci) 
 */

static int __ceph_is_any_caps(struct ceph_inode_info *ci)

{

	return !RB_EMPTY_ROOT(&ci->i_caps) || ci->i_cap_exporting_issued;

	return !RB_EMPTY_ROOT(&ci->i_caps);

}



int ceph_is_any_caps(struct inode *inode)
@@ -2796,7 +2778,7 @@ static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex, 
{

	struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;

	struct ceph_mds_session *tsession = NULL;

	struct ceph_cap *cap, *tcap;

	struct ceph_cap *cap, *tcap, *new_cap = NULL;

	struct ceph_inode_info *ci = ceph_inode(inode);

	u64 t_cap_id;

	unsigned mseq = le32_to_cpu(ex->migrate_seq);
@@ -2858,15 +2840,14 @@ static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex, 
		}

		__ceph_remove_cap(cap, false);

		goto out_unlock;

	}



	if (tsession) {

		int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0;

		spin_unlock(&ci->i_ceph_lock);

	} else if (tsession) {

		/* add placeholder for the export tagert */

		int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0;

		ceph_add_cap(inode, tsession, t_cap_id, -1, issued, 0,

			     t_seq - 1, t_mseq, (u64)-1, flag, NULL);

		goto retry;

			     t_seq - 1, t_mseq, (u64)-1, flag, &new_cap);



		__ceph_remove_cap(cap, false);

		goto out_unlock;

	}



	spin_unlock(&ci->i_ceph_lock);
@@ -2885,6 +2866,7 @@ static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex, 
					  SINGLE_DEPTH_NESTING);

		}

		ceph_add_cap_releases(mdsc, tsession);

		new_cap = ceph_get_cap(mdsc, NULL);

	} else {

		WARN_ON(1);

		tsession = NULL;
@@ -2899,6 +2881,8 @@ static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex, 
		mutex_unlock(&tsession->s_mutex);

		ceph_put_mds_session(tsession);

	}

	if (new_cap)

		ceph_put_cap(mdsc, new_cap);

}



/*
@@ -2914,7 +2898,7 @@ static void handle_cap_import(struct ceph_mds_client *mdsc, 
			      void *snaptrace, int snaptrace_len)

{

	struct ceph_inode_info *ci = ceph_inode(inode);

	struct ceph_cap *cap;

	struct ceph_cap *cap, *new_cap = NULL;

	int mds = session->s_mds;

	unsigned issued = le32_to_cpu(im->caps);

	unsigned wanted = le32_to_cpu(im->wanted);
@@ -2936,7 +2920,20 @@ static void handle_cap_import(struct ceph_mds_client *mdsc, 
	dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n",

	     inode, ci, mds, mseq, peer);



retry:

	spin_lock(&ci->i_ceph_lock);

	cap = __get_cap_for_mds(ci, mds);

	if (!cap) {

		if (!new_cap) {

			spin_unlock(&ci->i_ceph_lock);

			new_cap = ceph_get_cap(mdsc, NULL);

			goto retry;

		}

	}



	ceph_add_cap(inode, session, cap_id, -1, issued, wanted, seq, mseq,

		     realmino, CEPH_CAP_FLAG_AUTH, &new_cap);



	cap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL;

	if (cap && cap->cap_id == p_cap_id) {

		dout(" remove export cap %p mds%d flags %d\n",
@@ -2951,7 +2948,6 @@ static void handle_cap_import(struct ceph_mds_client *mdsc, 
			       cap->mseq, mds, le32_to_cpu(ph->seq),

			       le32_to_cpu(ph->mseq));

		}

		ci->i_cap_exporting_issued = cap->issued;

		__ceph_remove_cap(cap, (ph->flags & CEPH_CAP_FLAG_RELEASE));

	}
@@ -2960,16 +2956,17 @@ static void handle_cap_import(struct ceph_mds_client *mdsc, 
	ci->i_requested_max_size = 0;

	spin_unlock(&ci->i_ceph_lock);



	wake_up_all(&ci->i_cap_wq);



	down_write(&mdsc->snap_rwsem);

	ceph_update_snap_trace(mdsc, snaptrace, snaptrace+snaptrace_len,

			       false);

	downgrade_write(&mdsc->snap_rwsem);

	ceph_add_cap(inode, session, cap_id, -1,

		     issued, wanted, seq, mseq, realmino, CEPH_CAP_FLAG_AUTH,

		     NULL /* no caps context */);

	kick_flushing_inode_caps(mdsc, session, inode);

	up_read(&mdsc->snap_rwsem);



	if (new_cap)

		ceph_put_cap(mdsc, new_cap);

}



/*

fs/ceph/inode.c

+39 −31
Original line number Diff line number Diff line
@@ -341,7 +341,6 @@ struct inode *ceph_alloc_inode(struct super_block *sb) 
	INIT_LIST_HEAD(&ci->i_cap_snaps);

	ci->i_head_snapc = NULL;

	ci->i_snap_caps = 0;

	ci->i_cap_exporting_issued = 0;



	for (i = 0; i < CEPH_FILE_MODE_NUM; i++)

		ci->i_nr_by_mode[i] = 0;
@@ -407,7 +406,7 @@ void ceph_destroy_inode(struct inode *inode) 


	/*

	 * we may still have a snap_realm reference if there are stray

	 * caps in i_cap_exporting_issued or i_snap_caps.

	 * caps in i_snap_caps.

	 */

	if (ci->i_snap_realm) {

		struct ceph_mds_client *mdsc =
@@ -582,6 +581,7 @@ static int fill_inode(struct inode *inode, 
		      unsigned long ttl_from, int cap_fmode,

		      struct ceph_cap_reservation *caps_reservation)

{

	struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;

	struct ceph_mds_reply_inode *info = iinfo->in;

	struct ceph_inode_info *ci = ceph_inode(inode);

	int i;
@@ -591,7 +591,9 @@ static int fill_inode(struct inode *inode, 
	struct ceph_inode_frag *frag;

	struct rb_node *rb_node;

	struct ceph_buffer *xattr_blob = NULL;

	struct ceph_cap *new_cap = NULL;

	int err = 0;

	bool wake = false;

	bool queue_trunc = false;

	bool new_version = false;
@@ -599,6 +601,10 @@ static int fill_inode(struct inode *inode, 
	     inode, ceph_vinop(inode), le64_to_cpu(info->version),

	     ci->i_version);



	/* prealloc new cap struct */

	if (info->cap.caps && ceph_snap(inode) == CEPH_NOSNAP)

		new_cap = ceph_get_cap(mdsc, caps_reservation);



	/*

	 * prealloc xattr data, if it looks like we'll need it.  only

	 * if len > 4 (meaning there are actually xattrs; the first 4
@@ -762,8 +768,37 @@ static int fill_inode(struct inode *inode, 
		dout(" marking %p complete (empty)\n", inode);

		__ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count));

	}



	/* were we issued a capability? */

	if (info->cap.caps) {

		if (ceph_snap(inode) == CEPH_NOSNAP) {

			ceph_add_cap(inode, session,

				     le64_to_cpu(info->cap.cap_id),

				     cap_fmode,

				     le32_to_cpu(info->cap.caps),

				     le32_to_cpu(info->cap.wanted),

				     le32_to_cpu(info->cap.seq),

				     le32_to_cpu(info->cap.mseq),

				     le64_to_cpu(info->cap.realm),

				     info->cap.flags, &new_cap);

			wake = true;

		} 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);

		}

	} else if (cap_fmode >= 0) {

		pr_warning("mds issued no caps on %llx.%llx\n",

			   ceph_vinop(inode));

		__ceph_get_fmode(ci, cap_fmode);

	}

	spin_unlock(&ci->i_ceph_lock);



	if (wake)

		wake_up_all(&ci->i_cap_wq);



	/* queue truncate if we saw i_size decrease */

	if (queue_trunc)

		ceph_queue_vmtruncate(inode);
@@ -806,41 +841,14 @@ static int fill_inode(struct inode *inode, 
	}

	mutex_unlock(&ci->i_fragtree_mutex);



	/* were we issued a capability? */

	if (info->cap.caps) {

		if (ceph_snap(inode) == CEPH_NOSNAP) {

			ceph_add_cap(inode, session,

				     le64_to_cpu(info->cap.cap_id),

				     cap_fmode,

				     le32_to_cpu(info->cap.caps),

				     le32_to_cpu(info->cap.wanted),

				     le32_to_cpu(info->cap.seq),

				     le32_to_cpu(info->cap.mseq),

				     le64_to_cpu(info->cap.realm),

				     info->cap.flags,

				     caps_reservation);

		} else {

			spin_lock(&ci->i_ceph_lock);

			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);

			spin_unlock(&ci->i_ceph_lock);

		}

	} else if (cap_fmode >= 0) {

		pr_warning("mds issued no caps on %llx.%llx\n",

			   ceph_vinop(inode));

		__ceph_get_fmode(ci, cap_fmode);

	}



	/* update delegation info? */

	if (dirinfo)

		ceph_fill_dirfrag(inode, dirinfo);



	err = 0;



out:

	if (new_cap)

		ceph_put_cap(mdsc, new_cap);

	if (xattr_blob)

		ceph_buffer_put(xattr_blob);

	return err;

fs/ceph/super.h

+7 −6
Original line number Diff line number Diff line
@@ -292,7 +292,6 @@ struct ceph_inode_info { 
	struct ceph_snap_context *i_head_snapc;  /* set if wr_buffer_head > 0 or

						    dirty|flushing caps */

	unsigned i_snap_caps;           /* cap bits for snapped files */

	unsigned i_cap_exporting_issued;



	int i_nr_by_mode[CEPH_FILE_MODE_NUM];  /* open file counts */
@@ -775,11 +774,13 @@ static inline void ceph_forget_all_cached_acls(struct inode *inode) 
extern const char *ceph_cap_string(int c);

extern void ceph_handle_caps(struct ceph_mds_session *session,

			     struct ceph_msg *msg);

extern int ceph_add_cap(struct inode *inode,

extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc,

				     struct ceph_cap_reservation *ctx);

extern void ceph_add_cap(struct inode *inode,

			 struct ceph_mds_session *session, u64 cap_id,

			 int fmode, unsigned issued, unsigned wanted,

			 unsigned cap, unsigned seq, u64 realmino, int flags,

			struct ceph_cap_reservation *caps_reservation);

			 struct ceph_cap **new_cap);

extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release);

extern void ceph_put_cap(struct ceph_mds_client *mdsc,

			 struct ceph_cap *cap);