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Commit 4b4f8580 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'locks-v3.20-1' of git://git.samba.org/jlayton/linux 

Pull file locking related changes #1 from Jeff Layton:
 "This patchset contains a fairly major overhaul of how file locks are
  tracked within the inode.  Rather than a single list, we now create a
  per-inode "lock context" that contains individual lists for the file
  locks, and a new dedicated spinlock for them.

  There are changes in other trees that are based on top of this set so
  it may be easiest to pull this in early"

* tag 'locks-v3.20-1' of git://git.samba.org/jlayton/linux:
  locks: update comments that refer to inode->i_flock
  locks: consolidate NULL i_flctx checks in locks_remove_file
  locks: keep a count of locks on the flctx lists
  locks: clean up the lm_change prototype
  locks: add a dedicated spinlock to protect i_flctx lists
  locks: remove i_flock field from struct inode
  locks: convert lease handling to file_lock_context
  locks: convert posix locks to file_lock_context
  locks: move flock locks to file_lock_context
  ceph: move spinlocking into ceph_encode_locks_to_buffer and ceph_count_locks
  locks: add a new struct file_locking_context pointer to struct inode
  locks: have locks_release_file use flock_lock_file to release generic flock locks
  locks: add new struct list_head to struct file_lock
parents 87291235 8116bf4c

fs/ceph/locks.c

+32 −32
Original line number Diff line number Diff line
@@ -239,23 +239,21 @@ 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.

 */

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;



	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)

			++(*flock_count);

	ctx = inode->i_flctx;

	if (ctx) {

		*fcntl_count = ctx->flc_posix_cnt;

		*flock_count = ctx->flc_flock_cnt;

	}

	dout("counted %d flock locks and %d fcntl locks",

	     *flock_count, *fcntl_count);
@@ -271,6 +269,7 @@ 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 = inode->i_flctx;

	int err = 0;

	int seen_fcntl = 0;

	int seen_flock = 0;
@@ -279,8 +278,11 @@ int ceph_encode_locks_to_buffer(struct inode *inode, 
	dout("encoding %d flock and %d fcntl locks", num_flock_locks,

	     num_fcntl_locks);



	for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {

		if (lock->fl_flags & FL_POSIX) {

	if (!ctx)

		return 0;



	spin_lock(&ctx->flc_lock);

	list_for_each_entry(lock, &ctx->flc_flock, fl_list) {

		++seen_fcntl;

		if (seen_fcntl > num_fcntl_locks) {

			err = -ENOSPC;
@@ -291,9 +293,7 @@ int ceph_encode_locks_to_buffer(struct inode *inode, 
			goto fail;

		++l;

	}

	}

	for (lock = inode->i_flock; lock != NULL; lock = lock->fl_next) {

		if (lock->fl_flags & FL_FLOCK) {

	list_for_each_entry(lock, &ctx->flc_flock, fl_list) {

		++seen_flock;

		if (seen_flock > num_flock_locks) {

			err = -ENOSPC;
@@ -304,8 +304,8 @@ int ceph_encode_locks_to_buffer(struct inode *inode, 
			goto fail;

		++l;

	}

	}

fail:

	spin_unlock(&ctx->flc_lock);

	return err;

}

fs/ceph/mds_client.c

+0 −4
Original line number Diff line number Diff line
@@ -2700,20 +2700,16 @@ static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, 
		struct ceph_filelock *flocks;



encode_again:

		spin_lock(&inode->i_lock);

		ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);

		spin_unlock(&inode->i_lock);

		flocks = kmalloc((num_fcntl_locks+num_flock_locks) *

				 sizeof(struct ceph_filelock), GFP_NOFS);

		if (!flocks) {

			err = -ENOMEM;

			goto out_free;

		}

		spin_lock(&inode->i_lock);

		err = ceph_encode_locks_to_buffer(inode, flocks,

						  num_fcntl_locks,

						  num_flock_locks);

		spin_unlock(&inode->i_lock);

		if (err) {

			kfree(flocks);

			if (err == -ENOSPC)

fs/cifs/file.c

+11 −23
Original line number Diff line number Diff line
@@ -1113,11 +1113,6 @@ cifs_push_mandatory_locks(struct cifsFileInfo *cfile) 
	return rc;

}



/* copied from fs/locks.c with a name change */

#define cifs_for_each_lock(inode, lockp) \

	for (lockp = &inode->i_flock; *lockp != NULL; \

	     lockp = &(*lockp)->fl_next)



struct lock_to_push {

	struct list_head llist;

	__u64 offset;
@@ -1132,8 +1127,9 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile) 
{

	struct inode *inode = cfile->dentry->d_inode;

	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);

	struct file_lock *flock, **before;

	unsigned int count = 0, i = 0;

	struct file_lock *flock;

	struct file_lock_context *flctx = inode->i_flctx;

	unsigned int i;

	int rc = 0, xid, type;

	struct list_head locks_to_send, *el;

	struct lock_to_push *lck, *tmp;
@@ -1141,21 +1137,17 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile) 


	xid = get_xid();



	spin_lock(&inode->i_lock);

	cifs_for_each_lock(inode, before) {

		if ((*before)->fl_flags & FL_POSIX)

			count++;

	}

	spin_unlock(&inode->i_lock);

	if (!flctx)

		goto out;



	INIT_LIST_HEAD(&locks_to_send);



	/*

	 * Allocating count locks is enough because no FL_POSIX locks can be

	 * added to the list while we are holding cinode->lock_sem that

	 * Allocating flc_posix_cnt locks is enough because no FL_POSIX locks

	 * can be added to the list while we are holding cinode->lock_sem that

	 * protects locking operations of this inode.

	 */

	for (; i < count; i++) {

	for (i = 0; i < flctx->flc_posix_cnt; i++) {

		lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL);

		if (!lck) {

			rc = -ENOMEM;
@@ -1165,11 +1157,8 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile) 
	}



	el = locks_to_send.next;

	spin_lock(&inode->i_lock);

	cifs_for_each_lock(inode, before) {

		flock = *before;

		if ((flock->fl_flags & FL_POSIX) == 0)

			continue;

	spin_lock(&flctx->flc_lock);

	list_for_each_entry(flock, &flctx->flc_posix, fl_list) {

		if (el == &locks_to_send) {

			/*

			 * The list ended. We don't have enough allocated
@@ -1189,9 +1178,8 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile) 
		lck->length = length;

		lck->type = type;

		lck->offset = flock->fl_start;

		el = el->next;

	}

	spin_unlock(&inode->i_lock);

	spin_unlock(&flctx->flc_lock);



	list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) {

		int stored_rc;

fs/inode.c

+2 −1
Original line number Diff line number Diff line
@@ -194,7 +194,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode) 
#ifdef CONFIG_FSNOTIFY

	inode->i_fsnotify_mask = 0;

#endif



	inode->i_flctx = NULL;

	this_cpu_inc(nr_inodes);



	return 0;
@@ -237,6 +237,7 @@ void __destroy_inode(struct inode *inode) 
	BUG_ON(inode_has_buffers(inode));

	security_inode_free(inode);

	fsnotify_inode_delete(inode);

	locks_free_lock_context(inode->i_flctx);

	if (!inode->i_nlink) {

		WARN_ON(atomic_long_read(&inode->i_sb->s_remove_count) == 0);

		atomic_long_dec(&inode->i_sb->s_remove_count);

fs/lockd/svcsubs.c

+16 −10
Original line number Diff line number Diff line
@@ -164,12 +164,15 @@ nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file, 
{

	struct inode	 *inode = nlmsvc_file_inode(file);

	struct file_lock *fl;

	struct file_lock_context *flctx = inode->i_flctx;

	struct nlm_host	 *lockhost;



	if (!flctx || list_empty_careful(&flctx->flc_posix))

		return 0;

again:

	file->f_locks = 0;

	spin_lock(&inode->i_lock);

	for (fl = inode->i_flock; fl; fl = fl->fl_next) {

	spin_lock(&flctx->flc_lock);

	list_for_each_entry(fl, &flctx->flc_posix, fl_list) {

		if (fl->fl_lmops != &nlmsvc_lock_operations)

			continue;
@@ -180,7 +183,7 @@ nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file, 
		if (match(lockhost, host)) {

			struct file_lock lock = *fl;



			spin_unlock(&inode->i_lock);

			spin_unlock(&flctx->flc_lock);

			lock.fl_type  = F_UNLCK;

			lock.fl_start = 0;

			lock.fl_end   = OFFSET_MAX;
@@ -192,7 +195,7 @@ nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file, 
			goto again;

		}

	}

	spin_unlock(&inode->i_lock);

	spin_unlock(&flctx->flc_lock);



	return 0;

}
@@ -223,18 +226,21 @@ nlm_file_inuse(struct nlm_file *file) 
{

	struct inode	 *inode = nlmsvc_file_inode(file);

	struct file_lock *fl;

	struct file_lock_context *flctx = inode->i_flctx;



	if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares)

		return 1;



	spin_lock(&inode->i_lock);

	for (fl = inode->i_flock; fl; fl = fl->fl_next) {

	if (flctx && !list_empty_careful(&flctx->flc_posix)) {

		spin_lock(&flctx->flc_lock);

		list_for_each_entry(fl, &flctx->flc_posix, fl_list) {

			if (fl->fl_lmops == &nlmsvc_lock_operations) {

			spin_unlock(&inode->i_lock);

				spin_unlock(&flctx->flc_lock);

				return 1;

			}

		}

	spin_unlock(&inode->i_lock);

		spin_unlock(&flctx->flc_lock);

	}

	file->f_locks = 0;

	return 0;

}