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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>
This commit is contained in:
Trond Myklebust 2013-09-23 18:01:28 -04:00
parent 4a10c2ac2f
commit 5bc2afc2b5
4 changed files with 24 additions and 10 deletions
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2
fs/nfs/dir.c
View File

@ -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);

3
fs/nfs/nfs4file.c
View File

@ -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) {

26
fs/nfs/nfs4proc.c
View File

@ -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;

3
include/linux/nfs_xdr.h
View File

@ -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 *);