GekkoFS user library creation.

Build over replication/gekkofwd changes. This MR aims to create a standalone library to use inside a client application without LD_PRELOAD and syscall interception.

The user library needs some changes as some syscall_no_intercept calls are scattered through the logging and the general code of the client. Also we need to do not link syscall_intercept and to remove (or avoid) the gekkofs client constructor.

There is an example of write - read on the example directory.

The user needs to link gkfs_user_lib.so and use user_functions.hpp (installed on include/gkfs directory)

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• c4a2bcac - Library finish

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• 9de53b76 - Create an user_functions.hpp

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• 7d4c585d - Create an user_functions.hpp

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changed the description

marked this merge request as ready

added 39 commits

• 7d4c585d...0916c555 - 20 commits from branch master
• 0916c555...8b03dbf4 - 9 earlier commits
• b00ff754 - change forwarding option order
• fefe12a3 - Reduced syscall log
• 69d1e044 - Change CMake to remove Forward, changelog
• 3615063d - Disable GKFWD
• f5525c0f - remove endif
• 15c72260 - gkfwd leftover
• b007bfc6 - Creating Gekko API example
• a5cc36fb - 2 libs, disable syscall_intercept
• 31f42970 - Library finish
• e0fee784 - Create an user_functions.hpp

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• e0fee784...2835322a - 5 commits from branch master
• 2835322a...8bac7172 - 12 earlier commits
• d2660157 - removed old include date/tz
• 3f346104 - Removal of date leftovers
• 6e6a9a21 - extra comma on merge
• 2413965c - Creating Gekko API example
• 362fdbba - 2 libs, disable syscall_intercept
• a8adf8e1 - Library finish
• 67e22861 - Create an user_functions.hpp
• 4c76843e - Update submodule commit hash and add new user
• 134cc489 - Adding gkfs_stat to the user lib
• e46fd685 - Add file_list function, remove and expand gkfs_lib example

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added 23 commits

• 137dd33f - 1 commit from branch master
• 137dd33f...ad767d17 - 12 earlier commits
• 271b4a10 - removed old include date/tz
• 8699a0ab - Removal of date leftovers
• edcbcade - extra comma on merge
• 6356cb91 - Creating Gekko API example
• e4eee5ee - 2 libs, disable syscall_intercept
• fc78b4cb - Library finish
• ddd2e69b - Create an user_functions.hpp
• d7329711 - Update submodule commit hash and add new user
• 691fd0ad - Adding gkfs_stat to the user lib
• ccf3ac9e - Add file_list function, remove and expand gkfs_lib example

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• c4f37209 - Fix Git submodules
• cac14d84 - Creating Gekko API example
• 82200afb - 2 libs, disable syscall_intercept
• 339a5ce7 - Library finish
• a245eb7c - Create an user_functions.hpp
• 5a2d4a0c - Add headers and new user function headers
• a8819275 - Adding gkfs_stat to the user lib
• 18f8794f - Add file_list function, remove and expand gkfs_lib example

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• 10d1b9d5 - Fix submodules and CMake
• 7afe20d6 - Creating Gekko API example
• 17a5a1e5 - 2 libs, disable syscall_intercept
• 7955a5f6 - Library finish
• 3bd05e27 - Create an user_functions.hpp
• 7d2c3868 - Add headers and new user function headers
• 459f7685 - Adding gkfs_stat to the user lib
• 52f21e7e - Add file_list function, remove and expand gkfs_lib example

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@rnou When linking there is this warning:

/usr/lib/gcc/x86_64-pc-linux-gnu/12/../../../../x86_64-pc-linux-gnu/bin/ld: warning: CMakeFiles/gkfs_user_lib.dir/syscalls/util.S.o: missing .note.GNU-stack section implies executable stack
/usr/lib/gcc/x86_64-pc-linux-gnu/12/../../../../x86_64-pc-linux-gnu/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
[ 91%] Built target gkfs_user_lib

Setting the .note.GNU-stack section in the Util file actually disables the whole code, so this doesn't help. An alternative is adding -z noexecstack to the compiler flags. This seems to work but I am not sure about any ramifications to this flag. Any experience or insights with this?

assigned to @rnou

requested review from @marcvef

Um, no, could be that we are missing ASM in the CMakeFile ?

I am using gcc-12.3.0 :/.

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• 21ef0cb0 - Updated to Cxx 17

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• 21ef0cb0...5c3777f6 - 23 commits from branch master
• 6cbdc20c - Creating Gekko API example
• 9f5e4f34 - 2 libs, disable syscall_intercept
• 395e9329 - Library finish
• 965614f4 - Create an user_functions.hpp
• 3fefaec3 - Add headers and new user function headers
• 649df72d - Adding gkfs_stat to the user lib
• 751bceaa - Add file_list function, remove and expand gkfs_lib example
• b749fdf9 - Gfind CMake updated to Cxx 17

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resolved all threads

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• 634f0a71 - Update Hermes for CMake fixes
• e70867a1 - CMake cleanup
• 6adbd340 - CMake: Always build examples
• 3fc110d3 - Fix user library headers
• ad021c4b - Instruct the linker to mark the stack segment of gkfs_user_lib as non-executable.

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resolved all threads

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• 5320d81d - Fix user library headers
• 5aa4e850 - Instruct the linker to mark the stack segment of gkfs_user_lib as non-executable.

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approved this merge request

enabled an automatic merge when the pipeline for 5aa4e850 succeeds

canceled the automatic merge

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• 92c904a2 - Added changelog

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enabled an automatic merge when the pipeline for 92c904a2 succeeds

Successfully tested for several months.

merged

mentioned in commit 471a7739