diff options
| author |   Jan Kara <jack@suse.cz> | 2016-05-12 18:29:20 +0200 |
|---|---|---|
| committer |   Ross Zwisler <ross.zwisler@linux.intel.com> | 2016-05-19 15:28:40 -0600 |
| commit | 4d9a2c8746671efbb0c27d3ae28c7474597a7aad (patch) | |
| tree | 34fb766e63a1e503ba48482b34325dbb7bd3aafe /mm/memory.c | |
| parent | dax: Use radix tree entry lock to protect cow faults (diff) | |
| download | linux-dev-4d9a2c8746671efbb0c27d3ae28c7474597a7aad.tar.xz linux-dev-4d9a2c8746671efbb0c27d3ae28c7474597a7aad.zip | |
dax: Remove i_mmap_lock protection
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.
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/mm/memory.c b/mm/memory.c index f09cdb8d48fa..06f552504e79 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2453,8 +2453,6 @@ void unmap_mapping_range(struct address_space *mapping, if (details.last_index < details.first_index) details.last_index = ULONG_MAX; - - /* DAX uses i_mmap_lock to serialise file truncate vs page fault */ i_mmap_lock_write(mapping); if (unlikely(!RB_EMPTY_ROOT(&mapping->i_mmap))) unmap_mapping_range_tree(&mapping->i_mmap, &details); |