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Certain function must never be automatically inlined by gcc because
they are stack heavy or called recursively. This patch flags all
such functions I've found as 'noinline' to prevent gcc from making
the optimization.
Signed-off-by: Brian Behlendorf <[email protected]>
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Reduce kernel stack usage by lzjb_compress() by moving uint16 array
off the stack and on to the heap. The exact performance implications
of this I have not measured but we absolutely need to keep stack
usage to a minimum. If/when this becomes and issue we optimize.
Signed-off-by: Brian Behlendorf <[email protected]>
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Decrease stack usage for various call paths by forcing certain
functions to be inlined. By inlining the functions the overhead
of a new stack frame is removed at the cost of increased code size.
Signed-off-by: Brian Behlendorf <[email protected]>
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To reduce stack overhead this topic branch moves the 128 byte
blkptr_t data strucutre in dsl_scan_visitbp() to the heap.
Signed-off-by: Brian Behlendorf <[email protected]>
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Reduce stack usage by 256 bytes by moving buf char array from
the stack to the heap.
Signed-off-by: Brian Behlendorf <[email protected]>
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Reduce stack usage in dsl_deleg_get, gcc flagged it as consuming a
whopping 1040 bytes or potentially 1/4 of a 4K stack. This patch
moves all the large structures and buffer off the stack and on to
the heap. This includes 2 zap_cursor_t structs each 52 bytes in
size, 2 zap_attribute_t structs each 280 bytes in size, and 1
256 byte char array. The total saves on the stack is 880 bytes
after you account for the 5 new pointers added.
Also the source buffer length has been increased from MAXNAMELEN
to MAXNAMELEN+strlen(MOS_DIR_NAME)+1 as described by the comment in
dsl_dir_name(). A buffer overrun may have been possible with the
slightly smaller buffer.
Signed-off-by: Brian Behlendorf <[email protected]>
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Move dsl_dataset_t local variable from the stack to the heap.
This reduces the stack usage of this function from 2048 bytes
to 176 bytes for x84_64 arches.
Signed-off-by: Brian Behlendorf <[email protected]>
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Reduce stack usage by 276 bytes by moving the snaparg struct from the
stack to the heap. We have limited stack space we must not waste.
Signed-off-by: Brian Behlendorf <[email protected]>
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This commit preserves the recursive function dbuf_hold_impl() but moves
the local variables and function arguments to the heap to minimize
the stack frame size. Enough space is initially allocated on the
stack for 20 levels of recursion. This technique was based on commit
34229a2f2ac07363f64ddd63e014964fff2f0671 which reduced stack usage of
traverse_visitbp().
Signed-off-by: Brian Behlendorf <[email protected]>
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The dnode_move() functionality is only used in the kernel build.
As such we should be careful to wrap all of the related code
with '#ifdef _KERNEL' to avoid gcc warnings about unused code.
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This is a portability change which removes the dependence of the Solaris
thread library. All locations where Solaris thread API was used before
have been replaced with equivilant Solaris kernel style thread calls.
In user space the kernel style threading API is implemented in term of
the portable pthreads library. This includes all threads, mutexs,
condition variables, reader/writer locks, and taskqs.
Signed-off-by: Brian Behlendorf <[email protected]>
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Interestingly this looks like an upstream bug as well. If for some
reason we are unable to get a zvols statistics, because perhaps the
zpool is hopelessly corrupt, we would trigger the VERIFY. This
commit adds the proper error handling just to propagate the error
back to user space. Now the user space tools still must handle this
properly but in the worst case the tool will crash or perhaps have
some missing output. That's far far better than crashing the host.
Signed-off-by: Brian Behlendorf <[email protected]>
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The zio_taskq_dispatch() function may be called at interrupt time
and it is critical that we never sleep.
Additionally, wrap taskq_dispatch() in a while loop because it may
fail. This is non optimal but is OK for now.
Signed-off-by: Brian Behlendorf <[email protected]>
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This look like a typo. The intention was to use strlcat() however
strncat() was used instead accidentally this may lead to a buffer
overflow. This was caught by gcc -D_FORTIFY_SOURCE=2.
Signed-off-by: Brian Behlendorf <[email protected]>
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Properly initialize rwlock primitives.
Signed-off-by: Brian Behlendorf <[email protected]>
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Do not use zmod.h in userspace.
This has also been filed with the ZFS team. It makes the userspace
libzpool code use the zlib API, instead of the Solaris-only and
non-standard zmod.h. The zlib API is almost identical and is a de
facto standard, so this is a no-brainer.
Signed-off-by: Brian Behlendorf <[email protected]>
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Add missing \n's to dprintf()s
Signed-off-by: Brian Behlendorf <[email protected]>
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If your only going to allow one allocator to be used and it is defined
at compile time there is no point including the others in the build.
This patch could/should be refined for Linux to make the metaslab
configurable at run time. That might be a bit tricky however since
you would need to quiese all IO. Short of that making it configurable
as a module load option would be a reasonable compromise.
Signed-off-by: Brian Behlendorf <[email protected]>
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Remove all instances of list handling where the API is not used
and instead list data members are directly accessed. Doing this
sort of thing is bad for portability.
Additionally, ensure that list_link_init() is called on newly
created list nodes. This ensures the node is properly initialized
and does not rely on the assumption that zero'ing the list_node_t
via kmem_zalloc() is the same as proper initialization.
Signed-off-by: Brian Behlendorf <[email protected]>
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Move xiou stat structures from a header to the dmu.c source as is
done with all the other kstat interfaces. This information is local
to dmu.c registered the xuio kstat and should stay that way.
Signed-off-by: Brian Behlendorf <[email protected]>
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Replace non-fatal assertion with warning. This was being observed
during testing and it should not be fatal.
Signed-off-by: Brian Behlendorf <[email protected]>
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1) In vn_open(), if fstat64() returned an error, the real errno
was being obscured by calling close().
2) Add error handling for both pwrite64() calls in vn_rdwr().
Signed-off-by: Ricardo M. Correia <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
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Remove deadcode. It's possible the code should be in use
somewhere, but as the source code is laid out it currently
is not.
Signed-off-by: Brian Behlendorf <[email protected]>
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Fix two leaks with dbuf_dirty_record_t
Signed-off-by: Brian Behlendorf <[email protected]>
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In the linux kernel 'current' is defined to mean the current process
and can never be used as a local variable in a function. Simply
replace all usage of 'current' with 'curr' in this function.
Signed-off-by: Brian Behlendorf <[email protected]>
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The upstream commit cb code had a few bugs:
1) The arguments of the list_move_tail() call in txg_dispatch_callbacks()
were reversed by mistake. This caused the commit callbacks to not be
called at all.
2) ztest had a bug in ztest_dmu_commit_callbacks() where "error" was not
initialized correctly. This seems to have caused the test to always take
the simulated error code path, which made ztest unable to detect whether
commit cbs were being called for transactions that successfuly complete.
3) ztest had another bug in ztest_dmu_commit_callbacks() where the commit
cb threshold was not being compared correctly.
4) The commit cb taskq was using 'max_ncpus * 2' as the maxalloc argument
of taskq_create(), which could have caused unnecessary delays in the txg
sync thread.
Signed-off-by: Brian Behlendorf <[email protected]>
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Minor fixes for newly introduced acl support.
Signed-off-by: Brian Behlendorf <[email protected]>
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Gcc -Wall warn: 'uninitialized variable'
Signed-off-by: Brian Behlendorf <[email protected]>
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Gcc -Wall warn: 'unused variable'
Signed-off-by: Brian Behlendorf <[email protected]>
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Gcc -Wall warn: 'missing parenthesis'
Signed-off-by: Brian Behlendorf <[email protected]>
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Gcc ASSERT() missing cases are impossible
Signed-off-by: Brian Behlendorf <[email protected]>
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Resolve compiler warnings concerning missing braces.
Signed-off-by: Brian Behlendorf <[email protected]>
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Gcc -Wall warn: 'invalid prototype'
Signed-off-by: Brian Behlendorf <[email protected]>
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Use constructor attribute on non-Solaris platforms.
The #pragma init/fini ->__attribute__((constructor/destructor))
conversions, these should go upstream.
Signed-off-by: Brian Behlendorf <[email protected]>
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Remove all ident pragmas which are unknown to gcc.
Signed-off-by: Brian Behlendorf <[email protected]>
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Resolve issues uncovered by -D_FORTIFY_SOURCE=2, the default redhat
macro's file adds this option to the cflags. This causes warnings
of the following type designed to keep the developer honest:
warning: ignoring return value of 'foo', declared
with attribute warn_unused_result
The short term fix is to wrap these calls in VERIFY() to check the
return code. The code was already assusing these would never fail.
Signed-off-by: Brian Behlendorf <[email protected]>
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Gcc useless debugging.
Signed-off-by: Brian Behlendorf <[email protected]>
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Gcc -Wall warn: 'lacks a cast'
Gcc -Wall warn: 'comparison between pointer and integer'
Signed-off-by: Brian Behlendorf <[email protected]>
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Fix non-c90 compliant code, for the most part these changes
simply deal with where a particular variable is declared.
Under c90 it must alway be done at the very start of a block.
Signed-off-by: Brian Behlendorf <[email protected]>
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Add 'ull' suffix to 64-bit constants.
Signed-off-by: Brian Behlendorf <[email protected]>
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This is the last official OpenSolaris tag before the public
development tree was closed.
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These notes describe how to use TopGit with this repo. As of
this point TopGit is no longer used so the notes have been removed.
Signed-off-by: Brian Behlendorf <[email protected]>
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A simple README with a short summary of the project and a link
directing people to the online documentation.
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Update the COPYRIGHT and DISCLAIMER in an attempt to be clear about
the copyright and licensing issues.
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