From: Christoph Hellwig <hch@lst.de>
To: xfs@oss.sgi.com, peterz@infradead.org
Subject: [PATCH, RFC] xfs: remove i_iolock and use i_rwsem in the VFS inode instead
Date: Thu, 11 Aug 2016 10:10:23 -0700 [thread overview]
Message-ID: <1470935423-12329-1-git-send-email-hch@lst.de> (raw)
This patch drops the XFS-own i_iolock and uses the VFS i_rwsem which
recently replaced i_mutex instead. This means we only have to take
one looks instead of two in many fast path operations, and we can
also shrink the xfs_inode structure. Thanks to the xfs_ilock family
there is very little churn as well.
There is one major issue with this change though: lockdep currently
doesn't have a facility to assert a rw_sempahore is held exclusively,
which means we lose the nice ability to assert locking context in
XFS.
Peter, I think you mentioned this would be fairly easy to add to
lockdep and the rw_semaphore code. Any chance to come up with a proof
of concept?
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/xfs/xfs_dir2_readdir.c | 2 -
fs/xfs/xfs_file.c | 95 ++++++++++++++++-------------------------------
fs/xfs/xfs_icache.c | 6 +--
fs/xfs/xfs_inode.c | 79 ++++++++++++++++-----------------------
fs/xfs/xfs_inode.h | 7 +---
fs/xfs/xfs_ioctl.c | 2 +-
fs/xfs/xfs_iops.c | 14 +++----
fs/xfs/xfs_pnfs.c | 7 +---
fs/xfs/xfs_pnfs.h | 4 +-
fs/xfs/xfs_super.c | 2 +-
fs/xfs/xfs_symlink.c | 7 ++--
11 files changed, 83 insertions(+), 142 deletions(-)
diff --git a/fs/xfs/xfs_dir2_readdir.c b/fs/xfs/xfs_dir2_readdir.c
index f44f799..7662140 100644
--- a/fs/xfs/xfs_dir2_readdir.c
+++ b/fs/xfs/xfs_dir2_readdir.c
@@ -676,7 +676,6 @@ xfs_readdir(
args.dp = dp;
args.geo = dp->i_mount->m_dir_geo;
- xfs_ilock(dp, XFS_IOLOCK_SHARED);
if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
rval = xfs_dir2_sf_getdents(&args, ctx);
else if ((rval = xfs_dir2_isblock(&args, &v)))
@@ -685,7 +684,6 @@ xfs_readdir(
rval = xfs_dir2_block_getdents(&args, ctx);
else
rval = xfs_dir2_leaf_getdents(&args, ctx, bufsize);
- xfs_iunlock(dp, XFS_IOLOCK_SHARED);
return rval;
}
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index ed95e5b..b604dc7 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -47,40 +47,6 @@
static const struct vm_operations_struct xfs_file_vm_ops;
/*
- * Locking primitives for read and write IO paths to ensure we consistently use
- * and order the inode->i_mutex, ip->i_lock and ip->i_iolock.
- */
-static inline void
-xfs_rw_ilock(
- struct xfs_inode *ip,
- int type)
-{
- if (type & XFS_IOLOCK_EXCL)
- inode_lock(VFS_I(ip));
- xfs_ilock(ip, type);
-}
-
-static inline void
-xfs_rw_iunlock(
- struct xfs_inode *ip,
- int type)
-{
- xfs_iunlock(ip, type);
- if (type & XFS_IOLOCK_EXCL)
- inode_unlock(VFS_I(ip));
-}
-
-static inline void
-xfs_rw_ilock_demote(
- struct xfs_inode *ip,
- int type)
-{
- xfs_ilock_demote(ip, type);
- if (type & XFS_IOLOCK_EXCL)
- inode_unlock(VFS_I(ip));
-}
-
-/*
* Clear the specified ranges to zero through either the pagecache or DAX.
* Holes and unwritten extents will be left as-is as they already are zeroed.
*/
@@ -279,10 +245,10 @@ xfs_file_dio_aio_read(
* IO case of no page cache pages to proceeed concurrently without
* serialisation.
*/
- xfs_rw_ilock(ip, XFS_IOLOCK_SHARED);
+ xfs_ilock(ip, XFS_IOLOCK_SHARED);
if (mapping->nrpages) {
- xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);
- xfs_rw_ilock(ip, XFS_IOLOCK_EXCL);
+ xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+ xfs_ilock(ip, XFS_IOLOCK_EXCL);
/*
* The generic dio code only flushes the range of the particular
@@ -298,7 +264,7 @@ xfs_file_dio_aio_read(
if (mapping->nrpages) {
ret = filemap_write_and_wait(mapping);
if (ret) {
- xfs_rw_iunlock(ip, XFS_IOLOCK_EXCL);
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
return ret;
}
@@ -311,7 +277,7 @@ xfs_file_dio_aio_read(
WARN_ON_ONCE(ret);
ret = 0;
}
- xfs_rw_ilock_demote(ip, XFS_IOLOCK_EXCL);
+ xfs_ilock_demote(ip, XFS_IOLOCK_EXCL);
}
data = *to;
@@ -321,7 +287,7 @@ xfs_file_dio_aio_read(
iocb->ki_pos += ret;
iov_iter_advance(to, ret);
}
- xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);
+ xfs_iunlock(ip, XFS_IOLOCK_SHARED);
file_accessed(iocb->ki_filp);
return ret;
@@ -344,13 +310,13 @@ xfs_file_dax_read(
if (!count)
return 0; /* skip atime */
- xfs_rw_ilock(ip, XFS_IOLOCK_SHARED);
+ xfs_ilock(ip, XFS_IOLOCK_SHARED);
ret = dax_do_io(iocb, inode, &data, xfs_get_blocks_direct, NULL, 0);
if (ret > 0) {
iocb->ki_pos += ret;
iov_iter_advance(to, ret);
}
- xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);
+ xfs_iunlock(ip, XFS_IOLOCK_SHARED);
file_accessed(iocb->ki_filp);
return ret;
@@ -366,9 +332,9 @@ xfs_file_buffered_aio_read(
trace_xfs_file_buffered_read(ip, iov_iter_count(to), iocb->ki_pos);
- xfs_rw_ilock(ip, XFS_IOLOCK_SHARED);
+ xfs_ilock(ip, XFS_IOLOCK_SHARED);
ret = generic_file_read_iter(iocb, to);
- xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);
+ xfs_iunlock(ip, XFS_IOLOCK_SHARED);
return ret;
}
@@ -429,9 +395,9 @@ xfs_file_splice_read(
goto out;
}
- xfs_rw_ilock(ip, XFS_IOLOCK_SHARED);
+ xfs_ilock(ip, XFS_IOLOCK_SHARED);
ret = generic_file_splice_read(infilp, ppos, pipe, count, flags);
- xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);
+ xfs_iunlock(ip, XFS_IOLOCK_SHARED);
out:
if (ret > 0)
XFS_STATS_ADD(ip->i_mount, xs_read_bytes, ret);
@@ -488,15 +454,18 @@ restart:
if (error <= 0)
return error;
- error = xfs_break_layouts(inode, iolock, true);
+ error = xfs_break_layouts(inode, iolock);
if (error)
return error;
- /* For changing security info in file_remove_privs() we need i_mutex */
+ /*
+ * For changing security info in file_remove_privs() we need i_rwsem
+ * exclusively.
+ */
if (*iolock == XFS_IOLOCK_SHARED && !IS_NOSEC(inode)) {
- xfs_rw_iunlock(ip, *iolock);
+ xfs_iunlock(ip, *iolock);
*iolock = XFS_IOLOCK_EXCL;
- xfs_rw_ilock(ip, *iolock);
+ xfs_ilock(ip, *iolock);
goto restart;
}
/*
@@ -521,9 +490,9 @@ restart:
spin_unlock(&ip->i_flags_lock);
if (!drained_dio) {
if (*iolock == XFS_IOLOCK_SHARED) {
- xfs_rw_iunlock(ip, *iolock);
+ xfs_iunlock(ip, *iolock);
*iolock = XFS_IOLOCK_EXCL;
- xfs_rw_ilock(ip, *iolock);
+ xfs_ilock(ip, *iolock);
iov_iter_reexpand(from, count);
}
/*
@@ -630,7 +599,7 @@ xfs_file_dio_aio_write(
iolock = XFS_IOLOCK_EXCL;
else
iolock = XFS_IOLOCK_SHARED;
- xfs_rw_ilock(ip, iolock);
+ xfs_ilock(ip, iolock);
/*
* Recheck if there are cached pages that need invalidate after we got
@@ -638,9 +607,9 @@ xfs_file_dio_aio_write(
* we were waiting for the iolock.
*/
if (mapping->nrpages && iolock == XFS_IOLOCK_SHARED) {
- xfs_rw_iunlock(ip, iolock);
+ xfs_iunlock(ip, iolock);
iolock = XFS_IOLOCK_EXCL;
- xfs_rw_ilock(ip, iolock);
+ xfs_ilock(ip, iolock);
}
ret = xfs_file_aio_write_checks(iocb, from, &iolock);
@@ -673,7 +642,7 @@ xfs_file_dio_aio_write(
if (unaligned_io)
inode_dio_wait(inode);
else if (iolock == XFS_IOLOCK_EXCL) {
- xfs_rw_ilock_demote(ip, XFS_IOLOCK_EXCL);
+ xfs_ilock_demote(ip, XFS_IOLOCK_EXCL);
iolock = XFS_IOLOCK_SHARED;
}
@@ -696,7 +665,7 @@ xfs_file_dio_aio_write(
iov_iter_advance(from, ret);
}
out:
- xfs_rw_iunlock(ip, iolock);
+ xfs_iunlock(ip, iolock);
/*
* No fallback to buffered IO on errors for XFS, direct IO will either
@@ -730,7 +699,7 @@ xfs_file_dax_write(
} else {
iolock = XFS_IOLOCK_SHARED;
}
- xfs_rw_ilock(ip, iolock);
+ xfs_ilock(ip, iolock);
ret = xfs_file_aio_write_checks(iocb, from, &iolock);
if (ret)
@@ -748,7 +717,7 @@ xfs_file_dax_write(
}
if (iolock == XFS_IOLOCK_EXCL && !unaligned_io) {
- xfs_rw_ilock_demote(ip, XFS_IOLOCK_EXCL);
+ xfs_ilock_demote(ip, XFS_IOLOCK_EXCL);
iolock = XFS_IOLOCK_SHARED;
}
@@ -762,7 +731,7 @@ xfs_file_dax_write(
iov_iter_advance(from, ret);
}
out:
- xfs_rw_iunlock(ip, iolock);
+ xfs_iunlock(ip, iolock);
return ret;
}
@@ -779,7 +748,7 @@ xfs_file_buffered_aio_write(
int enospc = 0;
int iolock = XFS_IOLOCK_EXCL;
- xfs_rw_ilock(ip, iolock);
+ xfs_ilock(ip, iolock);
ret = xfs_file_aio_write_checks(iocb, from, &iolock);
if (ret)
@@ -820,7 +789,7 @@ write_retry:
current->backing_dev_info = NULL;
out:
- xfs_rw_iunlock(ip, iolock);
+ xfs_iunlock(ip, iolock);
return ret;
}
@@ -886,7 +855,7 @@ xfs_file_fallocate(
return -EOPNOTSUPP;
xfs_ilock(ip, iolock);
- error = xfs_break_layouts(inode, &iolock, false);
+ error = xfs_break_layouts(inode, &iolock);
if (error)
goto out_unlock;
diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index fb39a66..cc5e7b2 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -69,8 +69,6 @@ xfs_inode_alloc(
ASSERT(!xfs_isiflocked(ip));
ASSERT(ip->i_ino == 0);
- mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);
-
/* initialise the xfs inode */
ip->i_ino = ino;
ip->i_mount = mp;
@@ -387,8 +385,8 @@ xfs_iget_cache_hit(
xfs_inode_clear_reclaim_tag(pag, ip->i_ino);
inode->i_state = I_NEW;
- ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
- mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);
+ ASSERT(!rwsem_is_locked(&inode->i_rwsem));
+ init_rwsem(&inode->i_rwsem);
spin_unlock(&ip->i_flags_lock);
spin_unlock(&pag->pag_ici_lock);
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index e08eaea..e2b94bf 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -118,31 +118,31 @@ xfs_ilock_attr_map_shared(
}
/*
- * The xfs inode contains 3 multi-reader locks: the i_iolock the i_mmap_lock and
- * the i_lock. This routine allows various combinations of the locks to be
- * obtained.
+ * In addition to i_rwsem in the VFS inode, the xfs inode contains 2
+ * multi-reader locks: i_mmap_lock and the i_lock. This routine allows
+ * various combinations of the locks to be obtained.
*
* The 3 locks should always be ordered so that the IO lock is obtained first,
* the mmap lock second and the ilock last in order to prevent deadlock.
*
* Basic locking order:
*
- * i_iolock -> i_mmap_lock -> page_lock -> i_ilock
+ * i_rwsem -> i_mmap_lock -> page_lock -> i_ilock
*
* mmap_sem locking order:
*
- * i_iolock -> page lock -> mmap_sem
+ * i_rwsem -> page lock -> mmap_sem
* mmap_sem -> i_mmap_lock -> page_lock
*
* The difference in mmap_sem locking order mean that we cannot hold the
* i_mmap_lock over syscall based read(2)/write(2) based IO. These IO paths can
* fault in pages during copy in/out (for buffered IO) or require the mmap_sem
* in get_user_pages() to map the user pages into the kernel address space for
- * direct IO. Similarly the i_iolock cannot be taken inside a page fault because
+ * direct IO. Similarly the i_rwsem cannot be taken inside a page fault because
* page faults already hold the mmap_sem.
*
* Hence to serialise fully against both syscall and mmap based IO, we need to
- * take both the i_iolock and the i_mmap_lock. These locks should *only* be both
+ * take both the i_rwsem and the i_mmap_lock. These locks should *only* be both
* taken in places where we need to invalidate the page cache in a race
* free manner (e.g. truncate, hole punch and other extent manipulation
* functions).
@@ -167,10 +167,13 @@ xfs_ilock(
(XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_SUBCLASS_MASK)) == 0);
- if (lock_flags & XFS_IOLOCK_EXCL)
- mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
- else if (lock_flags & XFS_IOLOCK_SHARED)
- mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
+ if (lock_flags & XFS_IOLOCK_EXCL) {
+ down_write_nested(&VFS_I(ip)->i_rwsem,
+ XFS_IOLOCK_DEP(lock_flags));
+ } else if (lock_flags & XFS_IOLOCK_SHARED) {
+ down_read_nested(&VFS_I(ip)->i_rwsem,
+ XFS_IOLOCK_DEP(lock_flags));
+ }
if (lock_flags & XFS_MMAPLOCK_EXCL)
mrupdate_nested(&ip->i_mmaplock, XFS_MMAPLOCK_DEP(lock_flags));
@@ -216,10 +219,10 @@ xfs_ilock_nowait(
ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_SUBCLASS_MASK)) == 0);
if (lock_flags & XFS_IOLOCK_EXCL) {
- if (!mrtryupdate(&ip->i_iolock))
+ if (!down_write_trylock(&VFS_I(ip)->i_rwsem))
goto out;
} else if (lock_flags & XFS_IOLOCK_SHARED) {
- if (!mrtryaccess(&ip->i_iolock))
+ if (!down_read_trylock(&VFS_I(ip)->i_rwsem))
goto out;
}
@@ -247,9 +250,9 @@ out_undo_mmaplock:
mrunlock_shared(&ip->i_mmaplock);
out_undo_iolock:
if (lock_flags & XFS_IOLOCK_EXCL)
- mrunlock_excl(&ip->i_iolock);
+ up_write(&VFS_I(ip)->i_rwsem);
else if (lock_flags & XFS_IOLOCK_SHARED)
- mrunlock_shared(&ip->i_iolock);
+ up_read(&VFS_I(ip)->i_rwsem);
out:
return 0;
}
@@ -286,9 +289,9 @@ xfs_iunlock(
ASSERT(lock_flags != 0);
if (lock_flags & XFS_IOLOCK_EXCL)
- mrunlock_excl(&ip->i_iolock);
+ up_write(&VFS_I(ip)->i_rwsem);
else if (lock_flags & XFS_IOLOCK_SHARED)
- mrunlock_shared(&ip->i_iolock);
+ up_read(&VFS_I(ip)->i_rwsem);
if (lock_flags & XFS_MMAPLOCK_EXCL)
mrunlock_excl(&ip->i_mmaplock);
@@ -321,7 +324,7 @@ xfs_ilock_demote(
if (lock_flags & XFS_MMAPLOCK_EXCL)
mrdemote(&ip->i_mmaplock);
if (lock_flags & XFS_IOLOCK_EXCL)
- mrdemote(&ip->i_iolock);
+ downgrade_write(&VFS_I(ip)->i_rwsem);
trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_);
}
@@ -345,9 +348,11 @@ xfs_isilocked(
}
if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) {
- if (!(lock_flags & XFS_IOLOCK_SHARED))
- return !!ip->i_iolock.mr_writer;
- return rwsem_is_locked(&ip->i_iolock.mr_lock);
+ /*
+ * XXX: we'd need something like a rwsem_is_write_locked
+ * helper for the XFS_IOLOCK_EXCL case..
+ */
+ return rwsem_is_locked(&VFS_I(ip)->i_rwsem);
}
ASSERT(0);
@@ -397,11 +402,7 @@ xfs_lock_inumorder(int lock_mode, int subclass)
if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) {
ASSERT(subclass <= XFS_IOLOCK_MAX_SUBCLASS);
- ASSERT(xfs_lockdep_subclass_ok(subclass +
- XFS_IOLOCK_PARENT_VAL));
class += subclass << XFS_IOLOCK_SHIFT;
- if (lock_mode & XFS_IOLOCK_PARENT)
- class += XFS_IOLOCK_PARENT_VAL << XFS_IOLOCK_SHIFT;
}
if (lock_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) {
@@ -453,8 +454,6 @@ xfs_lock_inodes(
XFS_ILOCK_EXCL));
ASSERT(!(lock_mode & (XFS_IOLOCK_SHARED | XFS_MMAPLOCK_SHARED |
XFS_ILOCK_SHARED)));
- ASSERT(!(lock_mode & XFS_IOLOCK_EXCL) ||
- inodes <= XFS_IOLOCK_MAX_SUBCLASS + 1);
ASSERT(!(lock_mode & XFS_MMAPLOCK_EXCL) ||
inodes <= XFS_MMAPLOCK_MAX_SUBCLASS + 1);
ASSERT(!(lock_mode & XFS_ILOCK_EXCL) ||
@@ -689,7 +688,6 @@ xfs_lookup(
if (XFS_FORCED_SHUTDOWN(dp->i_mount))
return -EIO;
- xfs_ilock(dp, XFS_IOLOCK_SHARED);
error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
if (error)
goto out_unlock;
@@ -698,14 +696,12 @@ xfs_lookup(
if (error)
goto out_free_name;
- xfs_iunlock(dp, XFS_IOLOCK_SHARED);
return 0;
out_free_name:
if (ci_name)
kmem_free(ci_name->name);
out_unlock:
- xfs_iunlock(dp, XFS_IOLOCK_SHARED);
*ipp = NULL;
return error;
}
@@ -1179,8 +1175,7 @@ xfs_create(
if (error)
goto out_release_inode;
- xfs_ilock(dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL |
- XFS_IOLOCK_PARENT | XFS_ILOCK_PARENT);
+ xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
unlock_dp_on_error = true;
xfs_defer_init(&dfops, &first_block);
@@ -1216,7 +1211,7 @@ xfs_create(
* the transaction cancel unlocking dp so don't do it explicitly in the
* error path.
*/
- xfs_trans_ijoin(tp, dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
unlock_dp_on_error = false;
error = xfs_dir_createname(tp, dp, name, ip->i_ino,
@@ -1289,7 +1284,7 @@ xfs_create(
xfs_qm_dqrele(pdqp);
if (unlock_dp_on_error)
- xfs_iunlock(dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
+ xfs_iunlock(dp, XFS_ILOCK_EXCL);
return error;
}
@@ -1430,11 +1425,10 @@ xfs_link(
if (error)
goto std_return;
- xfs_ilock(tdp, XFS_IOLOCK_EXCL | XFS_IOLOCK_PARENT);
xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL);
- xfs_trans_ijoin(tp, tdp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
/*
* If we are using project inheritance, we only allow hard link
@@ -2528,10 +2522,9 @@ xfs_remove(
goto std_return;
}
- xfs_ilock(dp, XFS_IOLOCK_EXCL | XFS_IOLOCK_PARENT);
xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL);
- xfs_trans_ijoin(tp, dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
/*
@@ -2912,12 +2905,6 @@ xfs_rename(
* whether the target directory is the same as the source
* directory, we can lock from 2 to 4 inodes.
*/
- if (!new_parent)
- xfs_ilock(src_dp, XFS_IOLOCK_EXCL | XFS_IOLOCK_PARENT);
- else
- xfs_lock_two_inodes(src_dp, target_dp,
- XFS_IOLOCK_EXCL | XFS_IOLOCK_PARENT);
-
xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);
/*
@@ -2925,9 +2912,9 @@ xfs_rename(
* we can rely on either trans_commit or trans_cancel to unlock
* them.
*/
- xfs_trans_ijoin(tp, src_dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL);
if (new_parent)
- xfs_trans_ijoin(tp, target_dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL);
if (target_ip)
xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL);
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index e1a411e..dc8806f 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -55,7 +55,6 @@ typedef struct xfs_inode {
/* Transaction and locking information. */
struct xfs_inode_log_item *i_itemp; /* logging information */
mrlock_t i_lock; /* inode lock */
- mrlock_t i_iolock; /* inode IO lock */
mrlock_t i_mmaplock; /* inode mmap IO lock */
atomic_t i_pincount; /* inode pin count */
spinlock_t i_flags_lock; /* inode i_flags lock */
@@ -316,7 +315,7 @@ static inline int xfs_isiflocked(struct xfs_inode *ip)
* IOLOCK values
*
* 0-3 subclass value
- * 4-7 PARENT subclass values
+ * 4-7 unused
*
* MMAPLOCK values
*
@@ -331,10 +330,8 @@ static inline int xfs_isiflocked(struct xfs_inode *ip)
*
*/
#define XFS_IOLOCK_SHIFT 16
-#define XFS_IOLOCK_PARENT_VAL 4
-#define XFS_IOLOCK_MAX_SUBCLASS (XFS_IOLOCK_PARENT_VAL - 1)
+#define XFS_IOLOCK_MAX_SUBCLASS 3
#define XFS_IOLOCK_DEP_MASK 0x000f0000
-#define XFS_IOLOCK_PARENT (XFS_IOLOCK_PARENT_VAL << XFS_IOLOCK_SHIFT)
#define XFS_MMAPLOCK_SHIFT 20
#define XFS_MMAPLOCK_NUMORDER 0
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 96a70fd..29e0471 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -639,7 +639,7 @@ xfs_ioc_space(
return error;
xfs_ilock(ip, iolock);
- error = xfs_break_layouts(inode, &iolock, false);
+ error = xfs_break_layouts(inode, &iolock);
if (error)
goto out_unlock;
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index ab820f8..36ac28c 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -953,15 +953,13 @@ xfs_vn_setattr(
if (iattr->ia_valid & ATTR_SIZE) {
uint iolock = XFS_IOLOCK_EXCL;
- xfs_ilock(ip, iolock);
- error = xfs_break_layouts(d_inode(dentry), &iolock, true);
- if (!error) {
- xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
- iolock |= XFS_MMAPLOCK_EXCL;
+ error = xfs_break_layouts(d_inode(dentry), &iolock);
+ if (error)
+ return error;
- error = xfs_setattr_size(ip, iattr);
- }
- xfs_iunlock(ip, iolock);
+ xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
+ error = xfs_setattr_size(ip, iattr);
+ xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
} else {
error = xfs_setattr_nonsize(ip, iattr, 0);
}
diff --git a/fs/xfs/xfs_pnfs.c b/fs/xfs/xfs_pnfs.c
index 0f14b2e..94c8faa 100644
--- a/fs/xfs/xfs_pnfs.c
+++ b/fs/xfs/xfs_pnfs.c
@@ -32,8 +32,7 @@
int
xfs_break_layouts(
struct inode *inode,
- uint *iolock,
- bool with_imutex)
+ uint *iolock)
{
struct xfs_inode *ip = XFS_I(inode);
int error;
@@ -42,12 +41,8 @@ xfs_break_layouts(
while ((error = break_layout(inode, false) == -EWOULDBLOCK)) {
xfs_iunlock(ip, *iolock);
- if (with_imutex && (*iolock & XFS_IOLOCK_EXCL))
- inode_unlock(inode);
error = break_layout(inode, true);
*iolock = XFS_IOLOCK_EXCL;
- if (with_imutex)
- inode_lock(inode);
xfs_ilock(ip, *iolock);
}
diff --git a/fs/xfs/xfs_pnfs.h b/fs/xfs/xfs_pnfs.h
index e8339f7..b587cb9 100644
--- a/fs/xfs/xfs_pnfs.h
+++ b/fs/xfs/xfs_pnfs.h
@@ -8,10 +8,10 @@ int xfs_fs_map_blocks(struct inode *inode, loff_t offset, u64 length,
int xfs_fs_commit_blocks(struct inode *inode, struct iomap *maps, int nr_maps,
struct iattr *iattr);
-int xfs_break_layouts(struct inode *inode, uint *iolock, bool with_imutex);
+int xfs_break_layouts(struct inode *inode, uint *iolock);
#else
static inline int
-xfs_break_layouts(struct inode *inode, uint *iolock, bool with_imutex)
+xfs_break_layouts(struct inode *inode, uint *iolock)
{
return 0;
}
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 24ef83e..f32b95e 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -939,7 +939,7 @@ xfs_fs_destroy_inode(
trace_xfs_destroy_inode(ip);
- ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
+ ASSERT(!rwsem_is_locked(&inode->i_rwsem));
XFS_STATS_INC(ip->i_mount, vn_rele);
XFS_STATS_INC(ip->i_mount, vn_remove);
diff --git a/fs/xfs/xfs_symlink.c b/fs/xfs/xfs_symlink.c
index 58142ae..f2cb45e 100644
--- a/fs/xfs/xfs_symlink.c
+++ b/fs/xfs/xfs_symlink.c
@@ -238,8 +238,7 @@ xfs_symlink(
if (error)
goto out_release_inode;
- xfs_ilock(dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL |
- XFS_IOLOCK_PARENT | XFS_ILOCK_PARENT);
+ xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
unlock_dp_on_error = true;
/*
@@ -287,7 +286,7 @@ xfs_symlink(
* the transaction cancel unlocking dp so don't do it explicitly in the
* error path.
*/
- xfs_trans_ijoin(tp, dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
unlock_dp_on_error = false;
/*
@@ -412,7 +411,7 @@ out_release_inode:
xfs_qm_dqrele(pdqp);
if (unlock_dp_on_error)
- xfs_iunlock(dp, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL);
+ xfs_iunlock(dp, XFS_ILOCK_EXCL);
return error;
}
--
2.1.4
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next reply other threads:[~2016-08-11 17:10 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-11 17:10 Christoph Hellwig [this message]
2016-08-11 21:54 ` [PATCH, RFC] xfs: remove i_iolock and use i_rwsem in the VFS inode instead Peter Zijlstra
2016-08-18 17:37 ` Christoph Hellwig
2016-08-19 13:27 ` Peter Zijlstra
2016-08-20 6:37 ` Christoph Hellwig
2016-08-22 8:34 ` Peter Zijlstra
2016-09-05 15:12 ` Christoph Hellwig
2016-09-07 7:43 ` Peter Zijlstra
2016-09-08 6:06 ` Ingo Molnar
2016-08-11 23:43 ` Dave Chinner
2016-08-12 2:50 ` Christoph Hellwig
2016-08-12 9:58 ` Dave Chinner
2016-09-05 15:15 ` Christoph Hellwig
2016-09-07 21:45 ` Dave Chinner
2016-09-08 6:54 ` Peter Zijlstra
2016-09-09 1:06 ` Dave Chinner
2016-09-09 8:21 ` Peter Zijlstra
2016-09-09 8:34 ` Christoph Hellwig
2016-09-11 0:17 ` Dave Chinner
2016-09-13 19:42 ` Peter Zijlstra
2016-09-09 8:33 ` Christoph Hellwig
2016-09-09 8:44 ` Peter Zijlstra
2016-09-09 9:05 ` Christoph Hellwig
2016-09-09 9:51 ` Peter Zijlstra
2016-09-10 16:20 ` Christoph Hellwig
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