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...and unexport dirIVCache
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...against concurrent closes.
The testcase
(set -e; while true; do truncate -s $RANDOM b; done) &
(set -e; while true; do truncate -s $RANDOM b; done) &
uncovered lots of unnecessary RMW failures that were the result
of concurrent closes.
With this patch, the only remaining error is "Truncate on forgotten file"
that is probably caused by a problem in the go-fuse lib
( https://github.com/hanwen/go-fuse/issues/95 )
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The directory may have been concurrently deleted or moved. Failure to
read the diriv is not an error in that case.
Downgrading the message to debug.
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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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Another 3x performance boost for applications that walk the
directory tree.
Excerpt from performance.txt:
VERSION UNTAR LS RM
v0.4 48 1.5 5
v0.5-rc1 56 7 19
v0.5-rc1-1 54 4.1 9
v0.5-rc1-2 45 1.7 3.4 <---- THIS VERSION
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Formerly, we called decryptPath for every name.
That resulted in a directory walk that reads in all diriv files
on the way.
Massive improvement for RM and LS (check performance.txt for details)
VERSION UNTAR RM LS
v0.4 48 5 1.5
v0.5-rc1 56 19 7
v0.5-rc1-1 54 9 4.1 <---- THIS VERSION
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It decrypted all file names using the root directory iv
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(unused so far)
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