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: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 854a8f0..02b0df7 100644 (file)
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -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);

diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index e5b804d..77efaf1 100644 (file)
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -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) {

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 989bb9d..488ef9b 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -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 @@ out:
 }
 
 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;

diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 01fd84b..49f52c8 100644 (file)
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -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 *);