The patch titled
Subject: dax: add support for fsync/msync
has been added to the -mm tree. Its filename is
dax-add-support-for-fsync-msync-v7.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/dax-add-support-for-fsync-msync-v7.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/dax-add-support-for-fsync-msync-v7.patch
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------------------------------------------------------
From: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Subject: dax: add support for fsync/msync
3) Removed second verification of our radix tree entry before cache flush
in dax_writeback_one(). (Jan Kara)
Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: "J. Bruce Fields" <bfields@xxxxxxxxxxxx>
Cc: "Theodore Ts'o" <tytso@xxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Andreas Dilger <adilger.kernel@xxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxxx>
Cc: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/dax.c | 15 +++------------
1 file changed, 3 insertions(+), 12 deletions(-)
diff -puN fs/dax.c~dax-add-support-for-fsync-msync-v7 fs/dax.c
--- a/fs/dax.c~dax-add-support-for-fsync-msync-v7
+++ a/fs/dax.c
@@ -420,23 +420,14 @@ static int dax_writeback_one(struct bloc
if (WARN_ON_ONCE(ret < dax.size)) {
ret = -EIO;
- dax_unmap_atomic(bdev, &dax);
- return ret;
- }
-
- spin_lock_irq(&mapping->tree_lock);
- /*
- * We need to revalidate our radix entry while holding tree_lock
- * before we do the writeback.
- */
- if (!__radix_tree_lookup(page_tree, index, &node, &slot))
- goto unmap;
- if (*slot != entry)
goto unmap;
+ }
wb_cache_pmem(dax.addr, dax.size);
unmap:
dax_unmap_atomic(bdev, &dax);
+ return ret;
+
unlock:
spin_unlock_irq(&mapping->tree_lock);
return ret;
_
Patches currently in -mm which might be from ross.zwisler@xxxxxxxxxxxxxxx are
mm-dax-fix-livelock-allow-dax-pmd-mappings-to-become-writeable.patch
dax-fix-null-pointer-dereference-in-__dax_dbg.patch
dax-fix-conversion-of-holes-to-pmds.patch
pmem-add-wb_cache_pmem-to-the-pmem-api.patch
pmem-add-wb_cache_pmem-to-the-pmem-api-v6.patch
dax-support-dirty-dax-entries-in-radix-tree.patch
dax-support-dirty-dax-entries-in-radix-tree-v6.patch
mm-add-find_get_entries_tag.patch
dax-add-support-for-fsync-sync.patch
dax-add-support-for-fsync-sync-v6.patch
dax-add-support-for-fsync-msync-v7.patch
ext2-call-dax_pfn_mkwrite-for-dax-fsync-msync.patch
ext4-call-dax_pfn_mkwrite-for-dax-fsync-msync.patch
xfs-call-dax_pfn_mkwrite-for-dax-fsync-msync.patch
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