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On Fri, Feb 26, 2021 at 08:20:27AM +0800, Shiyang Ruan wrote:
> Some operations, such as comparing a range of data in two files under
> fsdax mode, requires nested iomap_open()/iomap_end() on two file. Thus,
> we introduce iomap_apply2() to accept arguments from two files and
> iomap_actor2_t for
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With dax we cannot deal with readpage() etc. So, we create a dax
comparison funciton which is similar with
vfs_dedupe_file_range_compare().
And introduce dax_remap_file_range_prep() for filesystem use.
Signed-off-by: Goldwyn Rodrigues
Signed-off-by: Shiyang Ruan
---
fs/dax.c | 51
Add xfs_break_two_dax_layouts() to break layout for tow dax files. Then
call compare range function only when files are both DAX or not.
Signed-off-by: Shiyang Ruan
---
fs/xfs/xfs_file.c| 20
fs/xfs/xfs_inode.c | 8 +++-
fs/xfs/xfs_inode.h | 1 +
Punch hole on a reflinked file needs dax_copy_edge() too. Otherwise,
data in not aligned area will be not correct. So, add the srcmap to
dax_iomap_zero() and replace memset() as dax_copy_edge().
Signed-off-by: Shiyang Ruan
---
fs/dax.c | 6 --
fs/iomap/buffered-io.c | 2 +-
We replace the existing entry to the newly allocated one in case of CoW.
Also, we mark the entry as PAGECACHE_TAG_TOWRITE so writeback marks this
entry as writeprotected. This helps us snapshots so new write
pagefaults after snapshots trigger a CoW.
Signed-off-by: Goldwyn Rodrigues
In fsdax mode, WRITE and ZERO on a shared extent need CoW performed. After
CoW, new allocated extents needs to be remapped to the file. So, add an
iomap_end for dax write ops to do the remapping work.
Signed-off-by: Shiyang Ruan
---
fs/xfs/xfs_bmap_util.c | 3 ++-
fs/xfs/xfs_file.c | 9
Some operations, such as comparing a range of data in two files under
fsdax mode, requires nested iomap_open()/iomap_end() on two file. Thus,
we introduce iomap_apply2() to accept arguments from two files and
iomap_actor2_t for actions on two files.
Signed-off-by: Shiyang Ruan
---
This patchset is attempt to add CoW support for fsdax, and take XFS,
which has both reflink and fsdax feature, as an example.
Changes from V1:
- Factor some helper functions to simplify dax fault code
- Introduce iomap_apply2() for dax_dedupe_file_range_compare()
- Fix mistakes and other
The dax page fault code is too long and a bit difficult to read. And it
is hard to understand when we trying to add new features. Some of the
PTE/PMD codes have similar logic. So, factor them as helper functions to
simplify the code.
Signed-off-by: Shiyang Ruan
---
fs/dax.c | 152
Add address output in dax_iomap_pfn() in order to perform a memcpy() in
CoW case. Since this function both output address and pfn, rename it to
dax_iomap_direct_access().
Signed-off-by: Shiyang Ruan
Reviewed-by: Christoph Hellwig
---
fs/dax.c | 16
1 file changed, 12
In the case where the iomap is a write operation and iomap is not equal
to srcmap after iomap_begin, we consider it is a CoW operation.
The destance extent which iomap indicated is new allocated extent.
So, it is needed to copy the data from srcmap to new allocated extent.
In theory, it is better
The core logic in the two dax page fault functions is similar. So, move
the logic into a common helper function. Also, to facilitate the
addition of new features, such as CoW, switch-case is no longer used to
handle different iomap types.
Signed-off-by: Shiyang Ruan
---
fs/dax.c | 211
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Hi QI,
QI Fuli writes:
> Due to the lack of jq command, the result of the test will be 'fail'.
> This patch adds checking the presence of jq commmand ahead.
> If there is no jq command in the system, the test will be marked as 'skip'.
>
> Signed-off-by: QI Fuli
> Link:
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