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| author | Thomas Munro <tmunro@postgresql.org> | 2018-11-07 09:51:50 +1300 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2018-11-07 09:51:50 +1300 |
| commit | c24dcd0cfd949bdf245814c4c2b3df828ee7db36 (patch) | |
| tree | 7b361229b1a9bb895894dff9eaa8a593be9e20ce /src/include | |
| parent | 3fd2a7932ef0708dda57369bb20c0499d905cc82 (diff) | |
| download | postgresql-c24dcd0cfd949bdf245814c4c2b3df828ee7db36.tar.gz postgresql-c24dcd0cfd949bdf245814c4c2b3df828ee7db36.zip | |
Use pg_pread() and pg_pwrite() for data files and WAL.
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
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/storage/fd.h | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/src/include/storage/fd.h b/src/include/storage/fd.h index 8e7c9728f4b..1289589a46b 100644 --- a/src/include/storage/fd.h +++ b/src/include/storage/fd.h @@ -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); |