Commit 13cd2184 authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds
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[PATCH] nfsd4: reference count struct nfs4_file 



Add a struct kref to each nfs4_file and take a reference to it from each
stateid and delegation that refers to it.  The atomicity guarantees are
overkill given that all this stuff is done under the single nfsd4 state lock,
but a) we'd like finer-grained locking some day, and b) this simplifies the
cleanup of the structures a bit, something that has previously been a bit
complicated and bug-prone.

Signed-off-by: default avatarJ. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: default avatarNeil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 8beefa24

fs/nfsd/nfs4state.c

+51 −49
Original line number Diff line number Diff line
@@ -111,7 +111,6 @@ opaque_hashval(const void *ptr, int nbytes) 
/* forward declarations */

static void release_stateowner(struct nfs4_stateowner *sop);

static void release_stateid(struct nfs4_stateid *stp, int flags);

static void release_file(struct nfs4_file *fp);



/*

 * Delegation state
@@ -121,6 +120,27 @@ static void release_file(struct nfs4_file *fp); 
spinlock_t recall_lock;

static struct list_head del_recall_lru;



static void

free_nfs4_file(struct kref *kref)

{

	struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);

	list_del(&fp->fi_hash);

	iput(fp->fi_inode);

	kmem_cache_free(file_slab, fp);

}



static inline void

put_nfs4_file(struct nfs4_file *fi)

{

	kref_put(&fi->fi_ref, free_nfs4_file);

}



static inline void

get_nfs4_file(struct nfs4_file *fi)

{

	kref_get(&fi->fi_ref);

}



static struct nfs4_delegation *

alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)

{
@@ -136,6 +156,7 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_f 
	INIT_LIST_HEAD(&dp->dl_del_perclnt);

	INIT_LIST_HEAD(&dp->dl_recall_lru);

	dp->dl_client = clp;

	get_nfs4_file(fp);

	dp->dl_file = fp;

	dp->dl_flock = NULL;

	get_file(stp->st_vfs_file);
@@ -163,6 +184,7 @@ nfs4_put_delegation(struct nfs4_delegation *dp) 
{

	if (atomic_dec_and_test(&dp->dl_count)) {

		dprintk("NFSD: freeing dp %p\n",dp);

		put_nfs4_file(dp->dl_file);

		kmem_cache_free(deleg_slab, dp);

	}

}
@@ -953,6 +975,7 @@ alloc_init_file(struct inode *ino) 


	fp = kmem_cache_alloc(file_slab, GFP_KERNEL);

	if (fp) {

		kref_init(&fp->fi_ref);

		INIT_LIST_HEAD(&fp->fi_hash);

		INIT_LIST_HEAD(&fp->fi_stateids);

		INIT_LIST_HEAD(&fp->fi_delegations);
@@ -964,24 +987,6 @@ alloc_init_file(struct inode *ino) 
	return NULL;

}



static void

release_all_files(void)

{

	int i;

	struct nfs4_file *fp;



	for (i=0;i<FILE_HASH_SIZE;i++) {

		while (!list_empty(&file_hashtbl[i])) {

			fp = list_entry(file_hashtbl[i].next, struct nfs4_file, fi_hash);

			/* this should never be more than once... */

			if (!list_empty(&fp->fi_stateids) || !list_empty(&fp->fi_delegations)) {

				printk("ERROR: release_all_files: file %p is open, creating dangling state !!!\n",fp);

			}

			release_file(fp);

		}

	}

}



static void

nfsd4_free_slab(kmem_cache_t **slab)

{
@@ -1141,6 +1146,7 @@ init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open * 
	list_add(&stp->st_perfilestate, &sop->so_perfilestate);

	list_add(&stp->st_perfile, &fp->fi_stateids);

	stp->st_stateowner = sop;

	get_nfs4_file(fp);

	stp->st_file = fp;

	stp->st_stateid.si_boot = boot_time;

	stp->st_stateid.si_stateownerid = sop->so_id;
@@ -1166,18 +1172,11 @@ release_stateid(struct nfs4_stateid *stp, int flags) 
		nfsd_close(filp);

	} else if (flags & LOCK_STATE)

		locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);

	put_nfs4_file(stp->st_file);

	kmem_cache_free(stateid_slab, stp);

	stp = NULL;

}



static void

release_file(struct nfs4_file *fp)

{

	list_del(&fp->fi_hash);

	iput(fp->fi_inode);

	kmem_cache_free(file_slab, fp);

}	



void

move_to_close_lru(struct nfs4_stateowner *sop)

{
@@ -1192,7 +1191,6 @@ void 
release_state_owner(struct nfs4_stateid *stp, int flag)

{

	struct nfs4_stateowner *sop = stp->st_stateowner;

	struct nfs4_file *fp = stp->st_file;



	dprintk("NFSD: release_state_owner\n");

	release_stateid(stp, flag);
@@ -1203,10 +1201,6 @@ release_state_owner(struct nfs4_stateid *stp, int flag) 
	 */

	if (sop->so_confirmed && list_empty(&sop->so_perfilestate))

		move_to_close_lru(sop);

	/* unused nfs4_file's are releseed. XXX slab cache? */

	if (list_empty(&fp->fi_stateids) && list_empty(&fp->fi_delegations)) {

		release_file(fp);

	}

}



static int
@@ -1236,9 +1230,11 @@ find_file(struct inode *ino) 
	struct nfs4_file *fp;



	list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {

		if (fp->fi_inode == ino)

		if (fp->fi_inode == ino) {

			get_nfs4_file(fp);

			return fp;

		}

	}

	return NULL;

}
@@ -1288,19 +1284,24 @@ nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type) 
	struct inode *ino = current_fh->fh_dentry->d_inode;

	struct nfs4_file *fp;

	struct nfs4_stateid *stp;

	int ret;



	dprintk("NFSD: nfs4_share_conflict\n");



	fp = find_file(ino);

	if (fp) {

	if (!fp)

		return nfs_ok;

	ret = nfserr_share_denied;

	/* Search for conflicting share reservations */

	list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {

		if (test_bit(deny_type, &stp->st_deny_bmap) ||

		    test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))

				return nfserr_share_denied;

		}

			goto out;

	}

	return nfs_ok;

	ret = nfs_ok;

out:

	put_nfs4_file(fp);

	return ret;

}



static inline void
@@ -1829,10 +1830,8 @@ nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nf 
	            stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,

	            stp->st_stateid.si_fileid, stp->st_stateid.si_generation);

out:

	/* take the opportunity to clean up unused state */

	if (fp && list_empty(&fp->fi_stateids) && list_empty(&fp->fi_delegations))

		release_file(fp);



	if (fp)

		put_nfs4_file(fp);

	/* CLAIM_PREVIOUS has different error returns */

	nfs4_set_claim_prev(open, &status);

	/*
@@ -2480,16 +2479,19 @@ find_stateid(stateid_t *stid, int flags) 
static struct nfs4_delegation *

find_delegation_stateid(struct inode *ino, stateid_t *stid)

{

	struct nfs4_file *fp = NULL;

	struct nfs4_file *fp;

	struct nfs4_delegation *dl;



	dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",

                    stid->si_boot, stid->si_stateownerid,

                    stid->si_fileid, stid->si_generation);



	fp = find_file(ino);

	if (fp)

		return find_delegation_file(fp, stid);

	if (!fp)

		return NULL;

	dl = find_delegation_file(fp, stid);

	put_nfs4_file(fp);

	return dl;

}



/*
@@ -2636,6 +2638,7 @@ alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struc 
	list_add(&stp->st_perfile, &fp->fi_stateids);

	list_add(&stp->st_perfilestate, &sop->so_perfilestate);

	stp->st_stateowner = sop;

	get_nfs4_file(fp);

	stp->st_file = fp;

	stp->st_stateid.si_boot = boot_time;

	stp->st_stateid.si_stateownerid = sop->so_id;
@@ -3287,7 +3290,6 @@ __nfs4_state_shutdown(void) 
		unhash_delegation(dp);

	}



	release_all_files();

	cancel_delayed_work(&laundromat_work);

	flush_scheduled_work();

	nfs4_init = 0;

include/linux/nfsd/state.h

+1 −0
Original line number Diff line number Diff line
@@ -217,6 +217,7 @@ struct nfs4_stateowner { 
*      share_acces, share_deny on the file.

*/

struct nfs4_file {

	struct kref		fi_ref;

	struct list_head        fi_hash;    /* hash by "struct inode *" */

	struct list_head        fi_stateids;

	struct list_head	fi_delegations;

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