Commit 7d947842 authored by J. Bruce Fields's avatar J. Bruce Fields
Browse files

nfsd4: fix downgrade/lock logic 



If we already had a RW open for a file, and get a readonly open, we were
piggybacking on the existing RW open.  That's inconsistent with the
downgrade logic which blows away the RW open assuming you'll still have
a readonly open.

Also, make sure there is a readonly or writeonly open available for
locking, again to prevent bad behavior in downgrade cases when any RW
open may be lost.

Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent 18608ad4

fs/nfsd/nfs4state.c

+15 −10
Original line number Diff line number Diff line
@@ -2450,14 +2450,13 @@ nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh, 
static __be32

nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)

{

	u32 op_share_access, new_access;

	u32 op_share_access = open->op_share_access & ~NFS4_SHARE_WANT_MASK;

	bool new_access;

	__be32 status;



	set_access(&new_access, stp->st_access_bmap);

	new_access = (~new_access) & open->op_share_access & ~NFS4_SHARE_WANT_MASK;



	new_access = !test_bit(op_share_access, &stp->st_access_bmap);

	if (new_access) {

		status = nfs4_get_vfs_file(rqstp, fp, cur_fh, new_access);

		status = nfs4_get_vfs_file(rqstp, fp, cur_fh, op_share_access);

		if (status)

			return status;

	}
@@ -2470,7 +2469,6 @@ nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *c 
		return status;

	}

	/* remember the open */

	op_share_access = open->op_share_access & ~NFS4_SHARE_WANT_MASK;

	__set_bit(op_share_access, &stp->st_access_bmap);

	__set_bit(open->op_share_deny, &stp->st_deny_bmap);
@@ -3560,7 +3558,8 @@ nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 
	struct nfs4_stateowner *open_sop = NULL;

	struct nfs4_stateowner *lock_sop = NULL;

	struct nfs4_stateid *lock_stp;

	struct file *filp;

	struct nfs4_file *fp;

	struct file *filp = NULL;

	struct file_lock file_lock;

	struct file_lock conflock;

	__be32 status = 0;
@@ -3590,7 +3589,6 @@ nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 
		 * lock stateid.

		 */

		struct nfs4_stateid *open_stp = NULL;

		struct nfs4_file *fp;

		

		status = nfserr_stale_clientid;

		if (!nfsd4_has_session(cstate) &&
@@ -3633,6 +3631,7 @@ nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 
		if (status)

			goto out;

		lock_sop = lock->lk_replay_owner;

		fp = lock_stp->st_file;

	}

	/* lock->lk_replay_owner and lock_stp have been created or found */
@@ -3647,13 +3646,19 @@ nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, 
	switch (lock->lk_type) {

		case NFS4_READ_LT:

		case NFS4_READW_LT:

			if (find_readable_file(lock_stp->st_file)) {

				nfs4_get_vfs_file(rqstp, fp, &cstate->current_fh, NFS4_SHARE_ACCESS_READ);

				filp = find_readable_file(lock_stp->st_file);

			}

			file_lock.fl_type = F_RDLCK;

			cmd = F_SETLK;

		break;

		case NFS4_WRITE_LT:

		case NFS4_WRITEW_LT:

			if (find_writeable_file(lock_stp->st_file)) {

				nfs4_get_vfs_file(rqstp, fp, &cstate->current_fh, NFS4_SHARE_ACCESS_WRITE);

				filp = find_writeable_file(lock_stp->st_file);

			}

			file_lock.fl_type = F_WRLCK;

			cmd = F_SETLK;

		break;

fs/nfsd/state.h

+6 −6
Original line number Diff line number Diff line
@@ -363,16 +363,16 @@ struct nfs4_file { 
 * at all? */

static inline struct file *find_writeable_file(struct nfs4_file *f)

{

	if (f->fi_fds[O_RDWR])

		return f->fi_fds[O_RDWR];

	if (f->fi_fds[O_WRONLY])

		return f->fi_fds[O_WRONLY];

	return f->fi_fds[O_RDWR];

}



static inline struct file *find_readable_file(struct nfs4_file *f)

{

	if (f->fi_fds[O_RDWR])

		return f->fi_fds[O_RDWR];

	if (f->fi_fds[O_RDONLY])

		return f->fi_fds[O_RDONLY];

	return f->fi_fds[O_RDWR];

}



static inline struct file *find_any_file(struct nfs4_file *f)

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