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using the new routine H5FDdeduplicate().
Simplify H5F_open() a bit, pushing some of the configuration checks into the
SMWR VFD. For example, check that page buffering is enabled in
H5FD_vfd_swmr_open() instead of in H5F_open(). Compare VFD SWMR configurations
in H5FD_vfd_swmr_dedup() instead of in H5F_open().
Clone the default file-access property list at a new file-access property list
ID, H5P_FILE_ACCESS_ANY_VFD. The new ID is used to indicate that if the file
that's being opened is already open under an existing virtual file, and if that
virtual file would not ordinarily be opened with the default FAPL, then it's ok
to use that virtual file.
Add a new optional method, `dedup`, to H5FD_class_t, and use it to customize a
VFD's deduplication.
Customize the SWMR VFD's deduplication. Make it honor H5P_FILE_ACCESS_ANY_VFD
Embed the VFD SWMR configuration in the H5FD_vfd_swmr_t to facilitate
comparison of configuration between new and old SWMR virtual files.
In H5F__sfile_search(), match using a pointer comparison instead of H5FD_cmp(),
because we will only ever enter H5F__sfile_search() with a deduplicated
H5FD_t *.
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of the va_list, so it's at least possible for another connector to know what
the operation is and decide whether to implement it or not.
Added a new VOL sub-class called "introspect" where callbacks that report
information about the connector or container can be placed. Added an
'opt_query' callback to this sub-class, for a connector to report back
to the library whether a particular optional callback operation is supported.
Also added a 'get_conn_cls' introspection callback, to retrieve the H5VL_class_t
of a connector (either the "current" connector, H5VL_GET_CONN_LVL_CURR, or
the terminal connector, H5VL_GET_CONN_LVL_TERM).
Moved the "post open" operation from a file 'specific' operation to a file
'optional' operation, now that it's possible to detect (with the 'opt_query'
introspection callback) whether a VOL connector implements an optional
operation, without just returning an error.
Added new internal VOL helper routines: H5VL_object_is_native, to determine
if an object is in (or is a) native file, and H5VL_file_is_same, to determine
if two objects are in (or are) the same terminal VOL connector's container.
(And moved the special handling for FILE_IS_EQUAL operation out of internal VOL
callback routine into H5VL_file_is_same)
Made new dataset 'get' operation for H5Dvlen_get_buf_size, aligning it better
with other 'get' operations in API.
Fixed several issues with pass-through connectors, which are now passing the
'make check-passthrough-vol' tests again.
A bunch of warning and style cleanups as well.
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level and fixing some code.' (commit 5c911d8baf3)"
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including the merge of `hdffv/hdf5/develop`, back to the branch that Vailin and
I share.
Now I need to put this branch on a fork with a less confusing name than
vchoi_fork!
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