Currently faults are protected against truncate by filesystem specific
i_mmap_sem and page lock in case of hole page. Cow faults are protected
DAX radix tree entry locking. So there's no need for i_mmap_lock in DAX
code. Remove it.
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
fs/dax.c | 7 -------
1 file changed, 7 deletions(-)
diff --git a/fs/dax.c b/fs/dax.c
index 2fcf4e8a17c5..a2a370db59b7 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -795,8 +795,6 @@ static int dax_insert_mapping(struct address_space *mapping,
int error;
void *ret;
- i_mmap_lock_read(mapping);
-
if (dax_map_atomic(bdev, &dax) < 0) {
error = PTR_ERR(dax.addr);
goto out;
@@ -821,7 +819,6 @@ static int dax_insert_mapping(struct address_space *mapping,
error = vm_insert_mixed(vma, vaddr, dax.pfn);
out:
- i_mmap_unlock_read(mapping);
put_locked_mapping_entry(mapping, vmf->pgoff, entry);
return error;
}
@@ -1063,8 +1060,6 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
truncate_pagecache_range(inode, lstart, lend);
}
- i_mmap_lock_read(mapping);
-
if (!write && !buffer_mapped(&bh) && buffer_uptodate(&bh)) {
spinlock_t *ptl;
pmd_t entry;
@@ -1162,8 +1157,6 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
}
out:
- i_mmap_unlock_read(mapping);
-
return result;
fallback:
--
2.6.2
--
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