Big performance improvement for fts-based tools that use FTS_NOSTAT.
Avoid spurious inode-mismatch problems on non-POSIX file systems. Details: http://article.gmane.org/gmane.comp.lib.gnulib.bugs/7416 * lib/fts_.h (FTS_DEFER_STAT): Define new flag. (FTS_OPTIONMASK): Extend the mask to reflect this addition. * lib/fts.c (DT_IS_KNOWN, DT_MUST_BE): Define. (FTS_NO_STAT_REQUIRED, FTS_STAT_REQUIRED): Define. (fts_set_stat_required): New function. (fts_open): Defer the calls to fts_stat, if possible or requested. Move the code that maps a command-line fts_info value FTS_DOT to FTS_D into fts_stat itself. (fts_read): Perform any required (deferred) fts_stat call. (fts_build): Likewise, for the directory we're about to open and read. In the readdir loop, carefully decide whether each entry will require an eventual call to fts_stat, using dirent.d_type info if available. (fts_stat): Move the test for whether to honor FTS_COMFOLLOW on a command line argument into this function. Update all callers. Map a return value of FTS_DOT to FTS_D for a command line argument. * modules/fts (Depends-on): Add d-type. Alphabetize. Thanks to Miklos Szeredi for his tenacity and for the initial bug report about "find" failing on a FUSE-based file system.
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