preload: fix truncate for paths outside of pmemfile pool

[marcinslusarz]

... when path crosses pmemfile mount point

Ref: #306

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This change is 

[krzycz]

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Reviewed 1 of 1 files at r1. Review status: all files reviewed at latest revision, all discussions resolved, some commit checks failed.

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Comments from Reviewable

[GBuella]

Could you add a test which truncates a file outside a pool? I'm curious about what codecov will say. Right now, it reports 50% of the diff is covered.

[sarahjelinek]

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Review status: all files reviewed at latest revision, all discussions resolved, some commit checks failed.

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Comments from Reviewable

[GBuella]

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Reviewed 1 of 1 files at r2, 2 of 2 files at r3. Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[codecov[bot]]

Codecov Report

Merging #337 into master will increase coverage by 0.34%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #337      +/-   ##
==========================================
+ Coverage   73.66%   74.01%   +0.34%     
==========================================
  Files          64       64              
  Lines        7990     7988       -2     
  Branches     1613     1612       -1     
==========================================
+ Hits         5886     5912      +26     
+ Misses       1588     1567      -21     
+ Partials      516      509       -7

Flag	Coverage Δ
#sqlite_tests	45.55% <0%> (-0.07%)	:arrow_down:
#tests_antool	12.21% <0%> (ø)	:arrow_up:
#tests_posix_multi_threaded	25.99% <0%> (+0.06%)	:arrow_up:
#tests_posix_single_threaded	56.09% <0%> (+0.04%)	:arrow_up:
#tests_preload	46.02% <100%> (+0.58%)	:arrow_up:

Impacted Files	Coverage Δ
src/libpmemfile/preload.c	49.25% <100%> (+2.13%)	:arrow_up:
src/libpmemfile-posix/rename.c	92% <0%> (+0.4%)	:arrow_up:
src/libpmemfile-posix/dir.c	85.5% <0%> (+0.73%)	:arrow_up:

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[sarahjelinek]

Reviewed 1 of 1 files at r2, 2 of 2 files at r3. Review status: :shipit: all files reviewed at latest revision, all discussions resolved, all commit checks successful.

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Comments from Reviewable