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Fallocate can return EINTR (interrupted system call) and does so
quite often when cpu profiling is enabled.
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This makes sure writing to a file fails early if the underlying
filesystem does not support fallocate. It also prevents partial header
write due to ENOSPC.
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Prevent the case that we run out of space in the middle of
writing a block - that would leave a corrupt block behind.
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go get github.com/remyoudompheng/go-misc/deadcode
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Move all the intelligence into the new file address_translation.go.
That the calculations were spread out too much became apparent when adding
the file header. This should make the code much easier to modify in the
future.
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Format: [ "Version" uint16 big endian ] [ "Id" 16 random bytes ]
Quoting SECURITY.md:
* Every file has a header that contains a 16-byte random *file id*
* Each block uses the file id and its block number as GCM *authentication data*
* This means the position of the blocks is protected as well. The blocks
can not be reordered or copied between different files without
causing an decryption error.
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Futimes() only takes microsecond resolution while the FUSE call
Utimens() wants nanosecond precision.
This is why UTIME_OMIT did not work - this change fixes the
xfstests generic/258 test failure.
The go library does not provide a FutimesNano() function which is
why I use UtimesNano() on /proc/self/fd/n.
This is what the Go library does in Futimes().
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The implementation was incomplete, disable fallocate completely for now.
See https://github.com/rfjakob/gocryptfs/issues/1
Fixes xfstests generic/075
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The bug was caused by using cipherOff where plainOff should
have been used.
Renamed the symbols for less confusion.
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Uncovered by running xfstests generic/014 several times
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"Offset" is unclear whether it is an offset from the start of file
or start of block. "Skip" seems much better.
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Cuts down the runtime of xfstests generic/014
from 1822 seconds to 36 seconds
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Fixes TestFileHoles test
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The actual fix is
oldSize := f.cfs.PlainSize(uint64(fi.Size()))
the rest is logging improvements
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Makes the log output smaller and more readable.
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The too-large reported value broke mmap
(applications saw appended zero bytes)
Also
* Add locking for all fd operations
* Add "--debug" command line switch
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Also, re-enable openssl and disable debug messages so testing
gocryptfs is less painful
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Fix issues in read and write paths.
Now passes selftest.
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Currently fails main_test.go, will be fixed in part II
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