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ext4: convert DAX faults to iomap infrastructure

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Convert DAX faults to use iomap infrastructure. We would not have to start
transaction in ext4_dax_fault() anymore since ext4_iomap_begin takes
care of that but so far we do that to avoid lock inversion of
transaction start with DAX entry lock which gets acquired in
dax_iomap_fault() before calling ->iomap_begin handler.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara
2016-11-20 18:51:24 -05:00
committed by Theodore Ts'o
parent 96f8ba3dd6
commit e2ae766c1b
2 changed files with 14 additions and 9 deletions
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9
fs/ext4/file.c
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@@ -275,7 +275,7 @@ static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
if (IS_ERR(handle))
result = VM_FAULT_SIGBUS;
else
result = dax_fault(vma, vmf, ext4_dax_get_block);
result = dax_iomap_fault(vma, vmf, &ext4_iomap_ops);
if (write) {
if (!IS_ERR(handle))
@@ -309,9 +309,10 @@ static int ext4_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
if (IS_ERR(handle))
result = VM_FAULT_SIGBUS;
else
result = dax_pmd_fault(vma, addr, pmd, flags,
ext4_dax_get_block);
else {
result = dax_iomap_pmd_fault(vma, addr, pmd, flags,
&ext4_iomap_ops);
}
if (write) {
if (!IS_ERR(handle))