An open file description (struct file) in a given process can be
associated with two different lock owners.
It can have a Posix lock owner which will be different in each process
that has a fd on the file.
It can have a Flock owner which will be the same in all processes.
When searching for a lock stateid to use, we need to consider both of these
owners
So add a new "flock_owner" to the "nfs_open_context" (of which there
is one for each open file description).
This flock_owner does not need to be reference-counted as there is a
1-1 relation between 'struct file' and nfs open contexts,
and it will never be part of a list of contexts. So there is no need
for a 'flock_context' - just the owner is enough.
The io_count included in the (Posix) lock_context provides no
guarantee that all read-aheads that could use the state have
completed, so not supporting it for flock locks in not a serious
problem. Synchronization between flock and read-ahead can be added
later if needed.
When creating an open_context for a non-openning create call, we don't have
a 'struct file' to pass in, so the lock context gets initialized with
a NULL owner, but this will never be used.
The flock_owner is not used at all in this patch, that will come later.
Signed-off-by: NeilBrown <neilb@xxxxxxxx>
---
fs/nfs/dir.c | 6 +++---
fs/nfs/inode.c | 7 +++++--
fs/nfs/nfs4file.c | 2 +-
fs/nfs/nfs4proc.c | 2 +-
include/linux/nfs_fs.h | 3 ++-
5 files changed, 12 insertions(+), 8 deletions(-)
Sorry, two little errors in previous version....
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 06e0bf092ba9..d5b87b28010d 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1453,9 +1453,9 @@ static fmode_t flags_to_mode(int flags)
return res;
}
-static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags)
+static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags, struct file *filp)
{
- return alloc_nfs_open_context(dentry, flags_to_mode(open_flags));
+ return alloc_nfs_open_context(dentry, flags_to_mode(open_flags), filp);
}
static int do_open(struct inode *inode, struct file *filp)
@@ -1540,7 +1540,7 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
return finish_no_open(file, dentry);
}
- ctx = create_nfs_open_context(dentry, open_flags);
+ ctx = create_nfs_open_context(dentry, open_flags, file);
err = PTR_ERR(ctx);
if (IS_ERR(ctx))
goto out;
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 1752fc7c0024..2138027eaba9 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -796,7 +796,9 @@ void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
}
EXPORT_SYMBOL_GPL(nfs_close_context);
-struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
+struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
+ fmode_t f_mode,
+ struct file *filp)
{
struct nfs_open_context *ctx;
struct rpc_cred *cred = rpc_lookup_cred();
@@ -815,6 +817,7 @@ struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f
ctx->mode = f_mode;
ctx->flags = 0;
ctx->error = 0;
+ ctx->flock_owner = (fl_owner_t)filp;
nfs_init_lock_context(&ctx->lock_context);
ctx->lock_context.open_context = ctx;
INIT_LIST_HEAD(&ctx->list);
@@ -939,7 +942,7 @@ int nfs_open(struct inode *inode, struct file *filp)
{
struct nfs_open_context *ctx;
- ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode);
+ ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
nfs_file_set_open_context(filp, ctx);
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 89a77950e0b0..0efba77789b9 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -57,7 +57,7 @@ nfs4_file_open(struct inode *inode, struct file *filp)
parent = dget_parent(dentry);
dir = d_inode(parent);
- ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode);
+ ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
err = PTR_ERR(ctx);
if (IS_ERR(ctx))
goto out;
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index b7df3ef84fc3..422ed5ac4efe 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3792,7 +3792,7 @@ nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
struct nfs4_state *state;
int status = 0;
- ctx = alloc_nfs_open_context(dentry, FMODE_READ);
+ ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index bf8a713c45b4..0adb02c4744d 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -70,6 +70,7 @@ struct nfs_lock_context {
struct nfs4_state;
struct nfs_open_context {
struct nfs_lock_context lock_context;
+ fl_owner_t flock_owner;
struct dentry *dentry;
struct rpc_cred *cred;
struct nfs4_state *state;
@@ -357,7 +358,7 @@ extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
extern void put_nfs_open_context(struct nfs_open_context *ctx);
extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
-extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode);
+extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp);
extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
extern void nfs_file_clear_open_context(struct file *flip);
--
2.10.0
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