[PATCH v3 05/13] locks: move flock locks to file_lock_context
From: Jeff Layton
Date: Thu Jan 22 2015 - 09:35:59 EST
From: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
Acked-by: Christoph Hellwig <hch@xxxxxx>
---
fs/ceph/locks.c | 23 ++++++++++++++++-------
fs/locks.c | 54 ++++++++++++++++++++++++++++++++++-------------------
fs/nfs/delegation.c | 19 +++++++++++++++++--
fs/nfs/nfs4state.c | 42 +++++++++++++++++++++++++++++++++++++++--
fs/nfs/pagelist.c | 6 ++++++
fs/nfs/write.c | 43 +++++++++++++++++++++++++++++++++++++-----
6 files changed, 152 insertions(+), 35 deletions(-)
diff --git a/fs/ceph/locks.c b/fs/ceph/locks.c
index 366dc2412605..917656ea8dcf 100644
--- 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 526d5fca67c8..055df53f19de 100644
--- 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 7f3f60641344..9f9f67b17e2b 100644
--- 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 5194933ed419..65c404bf61ae 100644
--- 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 2b5e769beb16..a3b62e15b444 100644
--- 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 af3af685a9e3..e072aeb34195 100644
--- 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;
}
/*
--
2.1.0
--
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