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Add pg_file_sync() to adminpack extension.

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This function allows us to fsync the specified file or directory.
It's useful, for example, when we want to sync the file that
pg_file_write() writes out or that COPY TO exports the data into,
for durability.

Author: Fujii Masao
Reviewed-By: Julien Rouhaud, Arthur Zakirov, Michael Paquier, Atsushi Torikoshi
Discussion: https://www.postgresql.org/message-id/CAHGQGwGY8uzZ_k8dHRoW1zDcy1Z7=5GQ+So4ZkVy2u=nLsk=hA@mail.gmail.com
This commit is contained in:
Fujii Masao
2020-01-24 20:42:52 +09:00
parent cc25464763
commit d694e0bb79
9 changed files with 89 additions and 4 deletions
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3
src/backend/storage/file/fd.c
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@ -319,7 +319,6 @@ static void pre_sync_fname(const char *fname, bool isdir, int elevel);
static void datadir_fsync_fname(const char *fname, bool isdir, int elevel);
static void unlink_if_exists_fname(const char *fname, bool isdir, int elevel);
static int fsync_fname_ext(const char *fname, bool isdir, bool ignore_perm, int elevel);
static int fsync_parent_path(const char *fname, int elevel);
@ -3376,7 +3375,7 @@ unlink_if_exists_fname(const char *fname, bool isdir, int elevel)
*
* Returns 0 if the operation succeeded, -1 otherwise.
*/
static int
int
fsync_fname_ext(const char *fname, bool isdir, bool ignore_perm, int elevel)
{
int fd;

1
src/include/storage/fd.h
View File

@ -145,6 +145,7 @@ 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 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);
extern int durable_unlink(const char *fname, int loglevel);
extern int durable_link_or_rename(const char *oldfile, const char *newfile, int loglevel);