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Commit 5bc2afc2 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

NFSv4: Honour the 'opened' parameter in the atomic_open() filesystem method 



Determine if we've created a new file by examining the directory change
attribute and/or the O_EXCL flag.

This fixes a regression when doing a non-exclusive create of a new file.
If the FILE_CREATED flag is not set, the atomic_open() command will
perform full file access permissions checks instead of just checking
for MAY_OPEN.

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 4a10c2ac

fs/nfs/dir.c

+1 −1
Original line number Diff line number Diff line
@@ -1458,7 +1458,7 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry, 


	trace_nfs_atomic_open_enter(dir, ctx, open_flags);

	nfs_block_sillyrename(dentry->d_parent);

	inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr);

	inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, opened);

	nfs_unblock_sillyrename(dentry->d_parent);

	if (IS_ERR(inode)) {

		err = PTR_ERR(inode);

fs/nfs/nfs4file.c

+2 −1
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ nfs4_file_open(struct inode *inode, struct file *filp) 
	struct inode *dir;

	unsigned openflags = filp->f_flags;

	struct iattr attr;

	int opened = 0;

	int err;



	/*
@@ -55,7 +56,7 @@ nfs4_file_open(struct inode *inode, struct file *filp) 
		nfs_wb_all(inode);

	}



	inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr);

	inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, &opened);

	if (IS_ERR(inode)) {

		err = PTR_ERR(inode);

		switch (err) {

fs/nfs/nfs4proc.c

+19 −7
Original line number Diff line number Diff line
@@ -912,6 +912,7 @@ struct nfs4_opendata { 
	struct iattr attrs;

	unsigned long timestamp;

	unsigned int rpc_done : 1;

	unsigned int file_created : 1;

	unsigned int is_recover : 1;

	int rpc_status;

	int cancelled;
@@ -1946,8 +1947,13 @@ static int _nfs4_proc_open(struct nfs4_opendata *data) 


	nfs_fattr_map_and_free_names(server, &data->f_attr);



	if (o_arg->open_flags & O_CREAT)

	if (o_arg->open_flags & O_CREAT) {

		update_changeattr(dir, &o_res->cinfo);

		if (o_arg->open_flags & O_EXCL)

			data->file_created = 1;

		else if (o_res->cinfo.before != o_res->cinfo.after)

			data->file_created = 1;

	}

	if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)

		server->caps &= ~NFS_CAP_POSIX_LOCK;

	if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
@@ -2191,7 +2197,8 @@ static int _nfs4_do_open(struct inode *dir, 
			struct nfs_open_context *ctx,

			int flags,

			struct iattr *sattr,

			struct nfs4_label *label)

			struct nfs4_label *label,

			int *opened)

{

	struct nfs4_state_owner  *sp;

	struct nfs4_state     *state = NULL;
@@ -2261,6 +2268,8 @@ static int _nfs4_do_open(struct inode *dir, 
			nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);

		}

	}

	if (opendata->file_created)

		*opened |= FILE_CREATED;



	if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))

		*ctx_th = opendata->f_attr.mdsthreshold;
@@ -2289,7 +2298,8 @@ static struct nfs4_state *nfs4_do_open(struct inode *dir, 
					struct nfs_open_context *ctx,

					int flags,

					struct iattr *sattr,

					struct nfs4_label *label)

					struct nfs4_label *label,

					int *opened)

{

	struct nfs_server *server = NFS_SERVER(dir);

	struct nfs4_exception exception = { };
@@ -2297,7 +2307,7 @@ static struct nfs4_state *nfs4_do_open(struct inode *dir, 
	int status;



	do {

		status = _nfs4_do_open(dir, ctx, flags, sattr, label);

		status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);

		res = ctx->state;

		trace_nfs4_open_file(ctx, flags, status);

		if (status == 0)
@@ -2659,7 +2669,8 @@ int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 
}



static struct inode *

nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)

nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,

		int open_flags, struct iattr *attr, int *opened)

{

	struct nfs4_state *state;

	struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
@@ -2667,7 +2678,7 @@ nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags 
	label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);



	/* Protect against concurrent sillydeletes */

	state = nfs4_do_open(dir, ctx, open_flags, attr, label);

	state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);



	nfs4_label_release_security(label);
@@ -3332,6 +3343,7 @@ nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 
	struct nfs4_label l, *ilabel = NULL;

	struct nfs_open_context *ctx;

	struct nfs4_state *state;

	int opened = 0;

	int status = 0;



	ctx = alloc_nfs_open_context(dentry, FMODE_READ);
@@ -3341,7 +3353,7 @@ nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 
	ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);



	sattr->ia_mode &= ~current_umask();

	state = nfs4_do_open(dir, ctx, flags, sattr, ilabel);

	state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);

	if (IS_ERR(state)) {

		status = PTR_ERR(state);

		goto out;

include/linux/nfs_xdr.h

+2 −1
Original line number Diff line number Diff line
@@ -1455,7 +1455,8 @@ struct nfs_rpc_ops { 
	struct inode * (*open_context) (struct inode *dir,

				struct nfs_open_context *ctx,

				int open_flags,

				struct iattr *iattr);

				struct iattr *iattr,

				int *);

	int (*have_delegation)(struct inode *, fmode_t);

	int (*return_delegation)(struct inode *);

	struct nfs_client *(*alloc_client) (const struct nfs_client_initdata *);