On Wed, 06 Aug 2014 21:33:25 +0800
Kinglong Mee <kinglongmee@xxxxxxxxx> wrote:
> Using fl_flags instead of fl_lmops for marking file_lock belongs to NFSD.
>
> Signed-off-by: Kinglong Mee <kinglongmee@xxxxxxxxx>
> ---
> fs/nfsd/nfs4state.c | 15 ++++-----------
> include/linux/fs.h | 1 +
> 2 files changed, 5 insertions(+), 11 deletions(-)
>
> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
> index 2e80a59..24168ae 100644
> --- a/fs/nfsd/nfs4state.c
> +++ b/fs/nfsd/nfs4state.c
> @@ -4867,17 +4867,12 @@ nfs4_transform_lock_offset(struct file_lock *lock)
> lock->fl_end = OFFSET_MAX;
> }
>
> -/* Hack!: For now, we're defining this just so we can use a pointer to it
> - * as a unique cookie to identify our (NFSv4's) posix locks. */
> -static const struct lock_manager_operations nfsd_posix_mng_ops = {
> -};
> -
> static inline void
> nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
> {
> struct nfs4_lockowner *lo;
>
> - if (fl->fl_lmops == &nfsd_posix_mng_ops) {
> + if (fl->fl_flags & FL_NFSD) {
> lo = (struct nfs4_lockowner *) fl->fl_owner;
> deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
> lo->lo_owner.so_owner.len, GFP_KERNEL);
> @@ -5241,8 +5236,7 @@ nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> file_lock->fl_owner = (fl_owner_t)lock_sop;
> file_lock->fl_pid = current->tgid;
> file_lock->fl_file = filp;
> - file_lock->fl_flags = FL_POSIX;
> - file_lock->fl_lmops = &nfsd_posix_mng_ops;
> + file_lock->fl_flags = FL_POSIX | FL_NFSD;
> file_lock->fl_start = lock->lk_offset;
> file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
> nfs4_transform_lock_offset(file_lock);
> @@ -5375,7 +5369,7 @@ nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> if (lo)
> file_lock->fl_owner = (fl_owner_t)lo;
> file_lock->fl_pid = current->tgid;
> - file_lock->fl_flags = FL_POSIX;
> + file_lock->fl_flags = FL_POSIX | FL_NFSD;
>
> file_lock->fl_start = lockt->lt_offset;
> file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
> @@ -5437,8 +5431,7 @@ nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
> file_lock->fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
> file_lock->fl_pid = current->tgid;
> file_lock->fl_file = filp;
> - file_lock->fl_flags = FL_POSIX;
> - file_lock->fl_lmops = &nfsd_posix_mng_ops;
> + file_lock->fl_flags = FL_POSIX | FL_NFSD;
> file_lock->fl_start = locku->lu_offset;
>
> file_lock->fl_end = last_byte_offset(locku->lu_offset,
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index e11d60c..4d40097 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -819,6 +819,7 @@ static inline struct file *get_file(struct file *f)
> #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
> #define FL_UNLOCK_PENDING 512 /* Lease is being broken */
> #define FL_OFDLCK 1024 /* lock is "owned" by struct file */
> +#define FL_NFSD 2048 /* NFSD holds this lock */
>
> /*
> * Special return value from posix_lock_file() and vfs_lock_file() for
Honestly, I'd prefer not using a fl_flag for this. Why, might you ask?
Currently, there are two alternate lock managers in the kernel (nfsd
and lockd) but there could (in principle) be an arbitrary number of
them later. What's so special about knfsd that it warrants its own flag?
I think existing use of an empty lock_manager_operations is a cleaner
solution than this for identifying locks owned by knfsd.
--
Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
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