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Return back checking file for sparseness. Use lseek(SEEK_HOLE) if supported by the system, otherwise fallback to block check. This allows to workaround bugs with SMB client and not introduce new bugs for filesystems with compression and deduplication.

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This has theoretical bug if our collection spans different
filesystems and some filesystems support holes, and some not.
If this ever encountered we should use pathconf(2) and cache
its result for directories.
This commit is contained in:
Gleb Smirnoff
2018-01-12 22:40:15 -08:00
committed by Justin Maggard
parent debb502ff3
commit 3e8da9bb1a
2 changed files with 28 additions and 7 deletions
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configure.ac
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@@ -68,6 +68,7 @@ AC_C_BIGENDIAN
AC_FUNC_FORK
AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK
AC_CHECK_FUNCS([gethostname getifaddrs gettimeofday inet_ntoa memmove memset mkdir realpath select sendfile setlocale socket strcasecmp strchr strdup strerror strncasecmp strpbrk strrchr strstr strtol strtoul])
AC_CHECK_DECLS([SEEK_HOLE])
#
# Check for struct ip_mreqn