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Use pg_pread() and pg_pwrite() for data files and WAL.

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Cut down on system calls by doing random I/O using offset-based OS
routines where available.  Remove the code for tracking the 'virtual'
seek position.  The only reason left to call FileSeek() was to get
the file's size, so provide a new function FileSize() instead.

Author: Oskari Saarenmaa, Thomas Munro
Reviewed-by: Thomas Munro, Jesper Pedersen, Tom Lane, Alvaro Herrera
Discussion: https://postgr.es/m/CAEepm=02rapCpPR3ZGF2vW=SBHSdFYO_bz_f-wwWJonmA3APgw@mail.gmail.com
Discussion: https://postgr.es/m/b8748d39-0b19-0514-a1b9-4e5a28e6a208%40gmail.com
Discussion: https://postgr.es/m/a86bd200-ebbe-d829-e3ca-0c4474b2fcb7%40ohmu.fi
This commit is contained in:
Thomas Munro
2018-11-07 09:51:50 +13:00
parent 3fd2a7932e
commit c24dcd0cfd
6 changed files with 42 additions and 288 deletions
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12
src/include/storage/fd.h
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@@ -15,7 +15,7 @@
/*
* calls:
*
* File {Close, Read, Write, Seek, Tell, Sync}
* File {Close, Read, Write, Size, Sync}
* {Path Name Open, Allocate, Free} File
*
* These are NOT JUST RENAMINGS OF THE UNIX ROUTINES.
@@ -42,10 +42,6 @@
#include <dirent.h>
/*
* FileSeek uses the standard UNIX lseek(2) flags.
*/
typedef int File;
@@ -68,10 +64,10 @@ extern File PathNameOpenFilePerm(const char *fileName, int fileFlags, mode_t fil
extern File OpenTemporaryFile(bool interXact);
extern void FileClose(File file);
extern int FilePrefetch(File file, off_t offset, int amount, uint32 wait_event_info);
extern int FileRead(File file, char *buffer, int amount, uint32 wait_event_info);
extern int FileWrite(File file, char *buffer, int amount, uint32 wait_event_info);
extern int FileRead(File file, char *buffer, int amount, off_t offset, uint32 wait_event_info);
extern int FileWrite(File file, char *buffer, int amount, off_t offset, uint32 wait_event_info);
extern int FileSync(File file, uint32 wait_event_info);
extern off_t FileSeek(File file, off_t offset, int whence);
extern off_t FileSize(File file);
extern int FileTruncate(File file, off_t offset, uint32 wait_event_info);
extern void FileWriteback(File file, off_t offset, off_t nbytes, uint32 wait_event_info);
extern char *FilePathName(File file);