* [merged] dax-fix-conversion-of-holes-to-pmds.patch removed from -mm tree
@ 2016-01-25 18:58 akpm
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From: akpm @ 2016-01-25 18:58 UTC (permalink / raw)
To: ross.zwisler, adilger.kernel, bfields, dan.j.williams,
dave.hansen, david, hpa, jack, jlayton, matthew.r.wilcox, mingo,
tglx, tytso, viro, willy, mm-commits
The patch titled
Subject: dax: fix conversion of holes to PMDs
has been removed from the -mm tree. Its filename was
dax-fix-conversion-of-holes-to-pmds.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Ross Zwisler <ross.zwisler@linux.intel.com>
Subject: dax: fix conversion of holes to PMDs
When we get a DAX PMD fault for a write it is possible that there could be
some number of 4k zero pages already present for the same range that were
inserted to service reads from a hole. These 4k zero pages need to be
unmapped from the VMAs and removed from the struct address_space radix
tree before the real DAX PMD entry can be inserted.
For PTE faults this same use case also exists and is handled by a
combination of unmap_mapping_range() to unmap the VMAs and
delete_from_page_cache() to remove the page from the address_space radix
tree.
For PMD faults we do have a call to unmap_mapping_range() (protected by a
buffer_new() check), but nothing clears out the radix tree entry. The
buffer_new() check is also incorrect as the current ext4 and XFS
filesystem code will never return a buffer_head with BH_New set, even when
allocating new blocks over a hole. Instead the filesystem will zero the
blocks manually and return a buffer_head with only BH_Mapped set.
Fix this situation by removing the buffer_new() check and adding a call to
truncate_inode_pages_range() to clear out the radix tree entries before we
insert the DAX PMD.
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reported-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jeff Layton <jlayton@poochiereds.net>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/dax.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff -puN fs/dax.c~dax-fix-conversion-of-holes-to-pmds fs/dax.c
--- a/fs/dax.c~dax-fix-conversion-of-holes-to-pmds
+++ a/fs/dax.c
@@ -589,6 +589,7 @@ int __dax_pmd_fault(struct vm_area_struc
bool write = flags & FAULT_FLAG_WRITE;
struct block_device *bdev;
pgoff_t size, pgoff;
+ loff_t lstart, lend;
sector_t block;
int result = 0;
@@ -643,15 +644,13 @@ int __dax_pmd_fault(struct vm_area_struc
goto fallback;
}
- /*
- * If we allocated new storage, make sure no process has any
- * zero pages covering this hole
- */
- if (buffer_new(&bh)) {
- i_mmap_unlock_read(mapping);
- unmap_mapping_range(mapping, pgoff << PAGE_SHIFT, PMD_SIZE, 0);
- i_mmap_lock_read(mapping);
- }
+ /* make sure no process has any zero pages covering this hole */
+ lstart = pgoff << PAGE_SHIFT;
+ lend = lstart + PMD_SIZE - 1; /* inclusive */
+ i_mmap_unlock_read(mapping);
+ unmap_mapping_range(mapping, lstart, PMD_SIZE, 0);
+ truncate_inode_pages_range(mapping, lstart, lend);
+ i_mmap_lock_read(mapping);
/*
* If a truncate happened while we were allocating blocks, we may
@@ -665,7 +664,8 @@ int __dax_pmd_fault(struct vm_area_struc
goto out;
}
if ((pgoff | PG_PMD_COLOUR) >= size) {
- dax_pmd_dbg(&bh, address, "pgoff unaligned");
+ dax_pmd_dbg(&bh, address,
+ "offset + huge page size > file size");
goto fallback;
}
_
Patches currently in -mm which might be from ross.zwisler@linux.intel.com are
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2016-01-25 18:58 [merged] dax-fix-conversion-of-holes-to-pmds.patch removed from -mm tree akpm
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