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directory offsets.
* src/gdbm.h.in (GDBM_BSEXACT): New flag.
* src/gdbmopen.c (compute_directory_size): New function.
(gdbm_open): When creating new database, adjust the requested
block size so that the block holds integer number of directory
indices. Disable this behavior if GDBM_BSEXACT flag is set
(this reverts to old behavior). Always unset GDBM_BSEXACT if
using block size returned by stat(2). This makes sure gdbm_open
succeeds on file systems reporting block sizes not divisible by
512.
* src/gdbmconst.h (GDBM_MIN_BLOCK_SIZE): New constant.
* src/gdbmimp.c (gdbm_import_from_file): Use GDBM_MIN_BLOCK_SIZE
instead of the hardcoded value.
* NEWS: Document GDBM_BSEXACT.
* doc/gdbm.texi: Likewise.
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* src/gdbmconst.h (GDBM_HASH_BITS): New constant.
* src/bucket.c: Use GDBM_HASH_BITS instead of the
hardcoded value.
* src/findkey.c (_gdbm_findkey): Use _gdbm_hash_key.
* src/gdbmtool.c (hash_handler): Use _gdbm_hash_key if the
database is open.
* src/hash.c (_gdbm_bucket_dir, _gdbm_hash_key): New functions.
* src/proto.h (_gdbm_bucket_dir, _gdbm_hash_key): New protos.
* src/systems.h (STATBLKSIZE): Take a struct stat as argument.
* src/gdbmopen.c (STATBLKSIZE): Takes argument now.
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reflect their nesting level.
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* src/gdbm.h.in (GDBM_OPENMASK): New constant.
* src/gdbmconst.h: Remove constants duplicated in
gdbm.h.in.
* src/gdbmdefs.h (gdbm_file_info) <allow_mmap>
<mmap_inited>: Replace with a single member: memory_mapping.
All callers updated.
(GDBM_SETCACHESIZE,GDBM_SETSYNCMODE)
(GDBM_SETCENTFREE,GDBM_SETCOALESCEBLKS): New option names.
(GDBM_SETMMAP,GDBM_GETMMAP,GDBM_GETFLAGS)
(GDBM_GETCACHESIZE,GDBM_GETSYNCMODE,GDBM_GETCENTFREE)
(GDBM_GETCOALESCEBLKS,GDBM_GETMAXMAPSIZE): New option codes.
* src/gdbmsetopt.c: Implement new options.
* doc/gdbm.texinfo: Document new options.
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The new code is more flexible and performs better when
lots of inserts are being made (e.g. when populating the
database with new data).
* src/gdbm.h.in (GDBM_SETMAXMAPSIZE): New constant.
* src/gdbmconst.h (SIZE_T_MAX): New define.
* src/gdbmdefs.h (gdbm_file_info) <cache_size>: Change type
to size_t.
<mmap_inited,mapped_size_max>: New member.
<mapped_remap>: Remove.
* src/gdbmopen.c: Fix a typo.
(gdbm_open): Initialize new members.
(_gdbm_init_cache): Second argument is size_t.
* src/gdbmsetopt.c (gdbm_setopt): Optval argument is void*.
Handle GDBM_SETMAXMAPSIZE.
Improve error checking.
* src/mmap.c (_GDBM_IN_MAPPED_REGION_P): Fix comparison with
the lower bound.
(_GDBM_NEED_REMAP): Return true if mapped_region is NULL.
(SUM_FILE_SIZE): Rewrite.
(_gdbm_mapped_unmap): Don't call msync.
(_gdbm_internal_remap): Take 2 arguments, the second one
giving the new mapped size.
Unmap the region prior to remapping it.
Always pass NULL as the argument to mmap.
(_gdbm_mapped_remap): Rewrite the logic. Change semantics of the
third argument. All uses updated.
(_gdbm_mapped_init): Reflect the above changes.
(_gdbm_mapped_read,_gdbm_mapped_write): Use mmap_inited to decide
whether to use mmap, because mapped_region can be reset to zero
by another functions (namely, _gdbm_mapped_lseek).
Reset mmap_inited to FALSE, if _gdbm_mapped_remap fails.
(_gdbm_mapped_lseek): Rewrite offset computations. Invalidate
the mapped region.
* src/proto.h (_gdbm_init_cache): Change prototype.
* src/update.c (write_header, _gdbm_end_update): Remove checks
for dbf->mapped_region.
* tests/gtload.c: Implement the -maxmap option (set maximal
mapped memory size).
* doc/gdbm.texinfo: Document GDBM_SETMAXMAPSIZE.
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