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Use truncate(2) where appropriate.

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When truncating files by name, use truncate(2).  Windows hasn't got it,
so keep our previous coding based on ftruncate(2) as a fallback.

Discussion: https://postgr.es/m/16663-fe97ccf9932fc800%40postgresql.org
This commit is contained in:
Thomas Munro
2020-12-01 15:34:57 +13:00
parent 9f35f94373
commit 57faaf376e
3 changed files with 29 additions and 12 deletions
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src/include/storage/fd.h
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@@ -153,6 +153,7 @@ extern int pg_fsync_no_writethrough(int fd);
extern int pg_fsync_writethrough(int fd);
extern int pg_fdatasync(int fd);
extern void pg_flush_data(int fd, off_t offset, off_t amount);
extern int pg_truncate(const char *path, off_t length);
extern void fsync_fname(const char *fname, bool isdir);
extern int fsync_fname_ext(const char *fname, bool isdir, bool ignore_perm, int elevel);
extern int durable_rename(const char *oldfile, const char *newfile, int loglevel);