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aio: Implement support for reads in smgr/md/fd

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This implements the following:

1) An smgr AIO target, for AIO on smgr files. This should be usable not just
   for md.c but also other SMGR implementation if we ever get them.
2) readv support in fd.c, which requires a small bit of infrastructure work in
   fd.c
3) smgr.c and md.c support for readv

There still is nothing performing AIO, but as of this commit it would be
possible.

As part of this change FileGetRawDesc() actually ensures that the file is
opened - previously it was basically not usable. It's used to reopen a file in
IO workers.

Reviewed-by: Noah Misch <noah@leadboat.com>
Discussion: https://postgr.es/m/uvrtrknj4kdytuboidbhwclo4gxhswwcpgadptsjvjqcluzmah%40brqs62irg4dt
Discussion: https://postgr.es/m/20210223100344.llw5an2aklengrmn@alap3.anarazel.de
Discussion: https://postgr.es/m/stj36ea6yyhoxtqkhpieia2z4krnam7qyetc57rfezgk4zgapf@gcnactj4z56m
This commit is contained in:
Andres Freund
2025-03-29 13:38:35 -04:00
parent dee8002468
commit 50cb7505b3
10 changed files with 437 additions and 4 deletions
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3
src/include/storage/fd.h
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@@ -101,6 +101,8 @@ extern PGDLLIMPORT int max_safe_fds;
* prototypes for functions in fd.c
*/
struct PgAioHandle;
/* Operations on virtual Files --- equivalent to Unix kernel file ops */
extern File PathNameOpenFile(const char *fileName, int fileFlags);
extern File PathNameOpenFilePerm(const char *fileName, int fileFlags, mode_t fileMode);
@@ -109,6 +111,7 @@ extern void FileClose(File file);
extern int FilePrefetch(File file, off_t offset, off_t amount, uint32 wait_event_info);
extern ssize_t FileReadV(File file, const struct iovec *iov, int iovcnt, off_t offset, uint32 wait_event_info);
extern ssize_t FileWriteV(File file, const struct iovec *iov, int iovcnt, off_t offset, uint32 wait_event_info);
extern int FileStartReadV(struct PgAioHandle *ioh, File file, int iovcnt, off_t offset, uint32 wait_event_info);
extern int FileSync(File file, uint32 wait_event_info);
extern int FileZero(File file, off_t offset, off_t amount, uint32 wait_event_info);
extern int FileFallocate(File file, off_t offset, off_t amount, uint32 wait_event_info);