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authorJan Kara <jack@suse.cz>2016-05-11 11:58:50 +0200
committerVishal Verma <vishal.l.verma@intel.com>2016-05-17 00:44:08 -0600
commit2b10945c532c165a824f541df76a15ed0be04d78 (patch)
tree2bbe9d771e8a2c2f53a23b80045bd6a6cb3d3ccf /fs/dax.c
parent86b0624e42d03a424e9571b8591d191c436f9af1 (diff)
dax: Remove dead zeroing code from fault handlers
Now that all filesystems zero out blocks allocated for a fault handler, we can just remove the zeroing from the handler itself. Also add checks that no filesystem returns to us unwritten or new buffer. Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Diffstat (limited to 'fs/dax.c')
-rw-r--r--fs/dax.c17
1 files changed, 2 insertions, 15 deletions
diff --git a/fs/dax.c b/fs/dax.c
index 83e7894d86d8..ccb8bc399d78 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -587,11 +587,6 @@ static int dax_insert_mapping(struct inode *inode, struct buffer_head *bh,
error = PTR_ERR(dax.addr);
goto out;
}
-
- if (buffer_unwritten(bh) || buffer_new(bh)) {
- clear_pmem(dax.addr, PAGE_SIZE);
- wmb_pmem();
- }
dax_unmap_atomic(bdev, &dax);
error = dax_radix_entry(mapping, vmf->pgoff, dax.sector, false,
@@ -722,7 +717,7 @@ int __dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
}
/* Filesystem should not return unwritten buffers to us! */
- WARN_ON_ONCE(buffer_unwritten(&bh));
+ WARN_ON_ONCE(buffer_unwritten(&bh) || buffer_new(&bh));
error = dax_insert_mapping(inode, &bh, vma, vmf);
out:
@@ -854,7 +849,7 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
if (get_block(inode, block, &bh, 1) != 0)
return VM_FAULT_SIGBUS;
alloc = true;
- WARN_ON_ONCE(buffer_unwritten(&bh));
+ WARN_ON_ONCE(buffer_unwritten(&bh) || buffer_new(&bh));
}
bdev = bh.b_bdev;
@@ -953,14 +948,6 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
dax_pmd_dbg(&bh, address, "pfn not in memmap");
goto fallback;
}
-
- if (buffer_unwritten(&bh) || buffer_new(&bh)) {
- clear_pmem(dax.addr, PMD_SIZE);
- wmb_pmem();
- count_vm_event(PGMAJFAULT);
- mem_cgroup_count_vm_event(vma->vm_mm, PGMAJFAULT);
- result |= VM_FAULT_MAJOR;
- }
dax_unmap_atomic(bdev, &dax);
/*