locks: move flock locks to file_lock_context

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Acked-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/ceph/locks.c b/fs/ceph/locks.c
index 366dc24..917656e 100644 (file)
--- a/fs/ceph/locks.c
+++ b/fs/ceph/locks.c
@@ -239,14 +239,16 @@ int ceph_flock(struct file *file, int cmd, struct file_lock *fl)
        return err;
 }
 
-/**
- * Must be called with lock_flocks() already held. Fills in the passed
- * counter variables, so you can prepare pagelist metadata before calling
- * ceph_encode_locks.
+/*
+ * Fills in the passed counter variables, so you can prepare pagelist metadata
+ * before calling ceph_encode_locks.
+ *
+ * FIXME: add counters to struct file_lock_context so we don't need to do this?
  */
 void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count)
 {
        struct file_lock *lock;
+       struct file_lock_context *ctx;
 
        *fcntl_count = 0;
        *flock_count = 0;
@@ -255,7 +257,11 @@ void ceph_count_locks(struct inode *inode, int *fcntl_count, int *flock_count)
        for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
                if (lock->fl_flags & FL_POSIX)
                        ++(*fcntl_count);
-               else if (lock->fl_flags & FL_FLOCK)
+       }
+
+       ctx = inode->i_flctx;
+       if (ctx) {
+               list_for_each_entry(lock, &ctx->flc_flock, fl_list)
                        ++(*flock_count);
        }
        spin_unlock(&inode->i_lock);
@@ -273,6 +279,7 @@ int ceph_encode_locks_to_buffer(struct inode *inode,
                                int num_fcntl_locks, int num_flock_locks)
 {
        struct file_lock *lock;
+       struct file_lock_context *ctx;
        int err = 0;
        int seen_fcntl = 0;
        int seen_flock = 0;
@@ -295,8 +302,10 @@ int ceph_encode_locks_to_buffer(struct inode *inode,
                        ++l;
                }
        }
-       for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {
-               if (lock->fl_flags & FL_FLOCK) {
+
+       ctx = inode->i_flctx;
+       if (ctx) {
+               list_for_each_entry(lock, &ctx->flc_flock, fl_list) {
                        ++seen_flock;
                        if (seen_flock > num_flock_locks) {
                                err = -ENOSPC;

diff --git a/fs/locks.c b/fs/locks.c
index 526d5fc..055df53 100644 (file)
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -694,6 +694,14 @@ static void locks_insert_lock(struct file_lock **pos, struct file_lock *fl)
        locks_insert_global_locks(fl);
 }
 
+static void
+locks_insert_lock_ctx(struct file_lock *fl, struct list_head *before)
+{
+       fl->fl_nspid = get_pid(task_tgid(current));
+       list_add_tail(&fl->fl_list, before);
+       locks_insert_global_locks(fl);
+}
+
 /**
  * locks_delete_lock - Delete a lock and then free it.
  * @thisfl_p: pointer that points to the fl_next field of the previous
@@ -739,6 +747,18 @@ static void locks_delete_lock(struct file_lock **thisfl_p,
                locks_free_lock(fl);
 }
 
+static void
+locks_delete_lock_ctx(struct file_lock *fl, struct list_head *dispose)
+{
+       locks_delete_global_locks(fl);
+       if (fl->fl_nspid) {
+               put_pid(fl->fl_nspid);
+               fl->fl_nspid = NULL;
+       }
+       locks_wake_up_blocks(fl);
+       list_move(&fl->fl_list, dispose);
+}
+
 /* Determine if lock sys_fl blocks lock caller_fl. Common functionality
  * checks for shared/exclusive status of overlapping locks.
  */
@@ -888,12 +908,17 @@ static int posix_locks_deadlock(struct file_lock *caller_fl,
 static int flock_lock_file(struct file *filp, struct file_lock *request)
 {
        struct file_lock *new_fl = NULL;
-       struct file_lock **before;
-       struct inode * inode = file_inode(filp);
+       struct file_lock *fl;
+       struct file_lock_context *ctx;
+       struct inode *inode = file_inode(filp);
        int error = 0;
-       int found = 0;
+       bool found = false;
        LIST_HEAD(dispose);
 
+       ctx = locks_get_lock_context(inode);
+       if (!ctx)
+               return -ENOMEM;
+
        if (!(request->fl_flags & FL_ACCESS) && (request->fl_type != F_UNLCK)) {
                new_fl = locks_alloc_lock();
                if (!new_fl)
@@ -904,18 +929,13 @@ static int flock_lock_file(struct file *filp, struct file_lock *request)
        if (request->fl_flags & FL_ACCESS)
                goto find_conflict;
 
-       for_each_lock(inode, before) {
-               struct file_lock *fl = *before;
-               if (IS_POSIX(fl))
-                       break;
-               if (IS_LEASE(fl))
-                       continue;
+       list_for_each_entry(fl, &ctx->flc_flock, fl_list) {
                if (filp != fl->fl_file)
                        continue;
                if (request->fl_type == fl->fl_type)
                        goto out;
-               found = 1;
-               locks_delete_lock(before, &dispose);
+               found = true;
+               locks_delete_lock_ctx(fl, &dispose);
                break;
        }
 
@@ -936,12 +956,7 @@ static int flock_lock_file(struct file *filp, struct file_lock *request)
        }
 
 find_conflict:
-       for_each_lock(inode, before) {
-               struct file_lock *fl = *before;
-               if (IS_POSIX(fl))
-                       break;
-               if (IS_LEASE(fl))
-                       continue;
+       list_for_each_entry(fl, &ctx->flc_flock, fl_list) {
                if (!flock_locks_conflict(request, fl))
                        continue;
                error = -EAGAIN;
@@ -954,7 +969,7 @@ find_conflict:
        if (request->fl_flags & FL_ACCESS)
                goto out;
        locks_copy_lock(new_fl, request);
-       locks_insert_lock(before, new_fl);
+       locks_insert_lock_ctx(new_fl, &ctx->flc_flock);
        new_fl = NULL;
        error = 0;
 
@@ -2412,8 +2427,9 @@ locks_remove_flock(struct file *filp)
                .fl_type = F_UNLCK,
                .fl_end = OFFSET_MAX,
        };
+       struct file_lock_context *flctx = file_inode(filp)->i_flctx;
 
-       if (!file_inode(filp)->i_flock)
+       if (!flctx || list_empty(&flctx->flc_flock))
                return;
 
        if (filp->f_op->flock)

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 7f3f606..9f9f67b 100644 (file)
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -85,15 +85,16 @@ static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_
 {
        struct inode *inode = state->inode;
        struct file_lock *fl;
+       struct file_lock_context *flctx;
        int status = 0;
 
-       if (inode->i_flock == NULL)
+       if (inode->i_flock == NULL && inode->i_flctx == NULL)
                goto out;
 
        /* Protect inode->i_flock using the i_lock */
        spin_lock(&inode->i_lock);
        for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
-               if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
+               if (!(fl->fl_flags & (FL_POSIX)))
                        continue;
                if (nfs_file_open_context(fl->fl_file) != ctx)
                        continue;
@@ -103,6 +104,20 @@ static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_
                        goto out;
                spin_lock(&inode->i_lock);
        }
+
+       flctx = inode->i_flctx;
+       if (flctx) {
+               list_for_each_entry(fl, &flctx->flc_flock, fl_list) {
+                       if (nfs_file_open_context(fl->fl_file) != ctx)
+                               continue;
+                       spin_unlock(&inode->i_lock);
+                       status = nfs4_lock_delegation_recall(fl, state,
+                                                               stateid);
+                       if (status < 0)
+                               goto out;
+                       spin_lock(&inode->i_lock);
+               }
+       }
        spin_unlock(&inode->i_lock);
 out:
        return status;

diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 5194933..65c404b 100644 (file)
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1366,8 +1366,9 @@ static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_
        struct nfs_inode *nfsi = NFS_I(inode);
        struct file_lock *fl;
        int status = 0;
+       struct file_lock_context *flctx = inode->i_flctx;
 
-       if (inode->i_flock == NULL)
+       if (inode->i_flock == NULL && flctx == NULL)
                return 0;
 
        /* Guard against delegation returns and new lock/unlock calls */
@@ -1375,7 +1376,7 @@ static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_
        /* Protect inode->i_flock using the BKL */
        spin_lock(&inode->i_lock);
        for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
-               if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
+               if (!(fl->fl_flags & FL_POSIX))
                        continue;
                if (nfs_file_open_context(fl->fl_file)->state != state)
                        continue;
@@ -1408,6 +1409,43 @@ static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_
                }
                spin_lock(&inode->i_lock);
        }
+
+       if (!flctx)
+               goto out_unlock;
+
+       list_for_each_entry(fl, &flctx->flc_flock, fl_list) {
+               if (nfs_file_open_context(fl->fl_file)->state != state)
+                       continue;
+               spin_unlock(&inode->i_lock);
+               status = ops->recover_lock(state, fl);
+               switch (status) {
+               case 0:
+                       break;
+               case -ESTALE:
+               case -NFS4ERR_ADMIN_REVOKED:
+               case -NFS4ERR_STALE_STATEID:
+               case -NFS4ERR_BAD_STATEID:
+               case -NFS4ERR_EXPIRED:
+               case -NFS4ERR_NO_GRACE:
+               case -NFS4ERR_STALE_CLIENTID:
+               case -NFS4ERR_BADSESSION:
+               case -NFS4ERR_BADSLOT:
+               case -NFS4ERR_BAD_HIGH_SLOT:
+               case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
+                       goto out;
+               default:
+                       pr_err("NFS: %s: unhandled error %d\n",
+                                       __func__, status);
+               case -ENOMEM:
+               case -NFS4ERR_DENIED:
+               case -NFS4ERR_RECLAIM_BAD:
+               case -NFS4ERR_RECLAIM_CONFLICT:
+                       /* kill_proc(fl->fl_pid, SIGLOST, 1); */
+                       status = 0;
+               }
+               spin_lock(&inode->i_lock);
+       }
+out_unlock:
        spin_unlock(&inode->i_lock);
 out:
        up_write(&nfsi->rwsem);

diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 2b5e769..a3b62e1 100644 (file)
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -826,6 +826,7 @@ static bool nfs_can_coalesce_requests(struct nfs_page *prev,
                                      struct nfs_pageio_descriptor *pgio)
 {
        size_t size;
+       struct file_lock_context *flctx;
 
        if (prev) {
                if (!nfs_match_open_context(req->wb_context, prev->wb_context))
@@ -834,6 +835,11 @@ static bool nfs_can_coalesce_requests(struct nfs_page *prev,
                    !nfs_match_lock_context(req->wb_lock_context,
                                            prev->wb_lock_context))
                        return false;
+               flctx = req->wb_context->dentry->d_inode->i_flctx;
+               if (flctx != NULL && !list_empty_careful(&flctx->flc_flock) &&
+                   !nfs_match_lock_context(req->wb_lock_context,
+                                           prev->wb_lock_context))
+                       return false;
                if (req_offset(req) != req_offset(prev) + prev->wb_bytes)
                        return false;
                if (req->wb_page == prev->wb_page) {

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index af3af68..e072aeb 100644 (file)
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1113,6 +1113,11 @@ int nfs_flush_incompatible(struct file *file, struct page *page)
                        do_flush |= l_ctx->lockowner.l_owner != current->files
                                || l_ctx->lockowner.l_pid != current->tgid;
                }
+               if (l_ctx && ctx->dentry->d_inode->i_flctx &&
+                   !list_empty_careful(&ctx->dentry->d_inode->i_flctx->flc_flock)) {
+                       do_flush |= l_ctx->lockowner.l_owner != current->files
+                               || l_ctx->lockowner.l_pid != current->tgid;
+               }
                nfs_release_request(req);
                if (!do_flush)
                        return 0;
@@ -1170,6 +1175,13 @@ out:
        return PageUptodate(page) != 0;
 }
 
+static bool
+is_whole_file_wrlock(struct file_lock *fl)
+{
+       return fl->fl_start == 0 && fl->fl_end == OFFSET_MAX &&
+                       fl->fl_type == F_WRLCK;
+}
+
 /* If we know the page is up to date, and we're not using byte range locks (or
  * if we have the whole file locked for writing), it may be more efficient to
  * extend the write to cover the entire page in order to avoid fragmentation
@@ -1180,17 +1192,38 @@ out:
  */
 static int nfs_can_extend_write(struct file *file, struct page *page, struct inode *inode)
 {
+       int ret;
+       struct file_lock_context *flctx = inode->i_flctx;
+       struct file_lock *fl;
+
        if (file->f_flags & O_DSYNC)
                return 0;
        if (!nfs_write_pageuptodate(page, inode))
                return 0;
        if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
                return 1;
-       if (inode->i_flock == NULL || (inode->i_flock->fl_start == 0 &&
-                       inode->i_flock->fl_end == OFFSET_MAX &&
-                       inode->i_flock->fl_type != F_RDLCK))
-               return 1;
-       return 0;
+       if (!inode->i_flock && !flctx)
+               return 0;
+
+       /* Check to see if there are whole file write locks */
+       spin_lock(&inode->i_lock);
+       ret = 0;
+
+       fl = inode->i_flock;
+       if (fl && is_whole_file_wrlock(fl)) {
+               ret = 1;
+               goto out;
+       }
+
+       if (!list_empty(&flctx->flc_flock)) {
+               fl = list_first_entry(&flctx->flc_flock, struct file_lock,
+                                       fl_list);
+               if (fl->fl_type == F_WRLCK)
+                       ret = 1;
+       }
+out:
+       spin_unlock(&inode->i_lock);
+       return ret;
 }
 
 /*