diff options
| -rw-r--r-- | mysys/mf_iocache.c | 4 | ||||
| -rw-r--r-- | mysys/my_pread.c | 26 | ||||
| -rw-r--r-- | mysys/my_read.c | 52 |
3 files changed, 51 insertions, 31 deletions
diff --git a/mysys/mf_iocache.c b/mysys/mf_iocache.c index bd71e2ae527..9a051cf6a9e 100644 --- a/mysys/mf_iocache.c +++ b/mysys/mf_iocache.c @@ -282,6 +282,10 @@ int init_io_cache(IO_CACHE *info, File file, size_t cachesize, } info->inited=info->aio_result.pending=0; #endif + if (type == READ_CACHE || type == WRITE_CACHE || type == SEQ_READ_APPEND) + info->myflags|= MY_FULL_IO; + else + info->myflags&= ~MY_FULL_IO; DBUG_RETURN(0); } /* init_io_cache */ diff --git a/mysys/my_pread.c b/mysys/my_pread.c index 51b4c5f5599..52d5c382960 100644 --- a/mysys/my_pread.c +++ b/mysys/my_pread.c @@ -47,8 +47,7 @@ size_t my_pread(File Filedes, uchar *Buffer, size_t Count, my_off_t offset, myf MyFlags) { - size_t readbytes; - int error= 0; + size_t readbytes, save_count= 0; DBUG_ENTER("my_pread"); @@ -66,11 +65,10 @@ size_t my_pread(File Filedes, uchar *Buffer, size_t Count, my_off_t offset, #else readbytes= pread(Filedes, Buffer, Count, offset); #endif - error = (readbytes != Count); - if (error) + if (readbytes != Count) { - my_errno= errno ? errno : -1; + my_errno= errno; if (errno == 0 || (readbytes != (size_t) -1 && (MyFlags & (MY_NABP | MY_FNABP)))) my_errno= HA_ERR_FILE_TOO_SHORT; @@ -82,6 +80,18 @@ size_t my_pread(File Filedes, uchar *Buffer, size_t Count, my_off_t offset, (int) readbytes)); continue; /* Interrupted */ } + + /* Do a read retry if we didn't get enough data on first read */ + if (readbytes != (size_t) -1 && readbytes != 0 && + (MyFlags & MY_FULL_IO)) + { + Buffer+= readbytes; + Count-= readbytes; + save_count+= readbytes; + offset+= readbytes; + continue; + } + if (MyFlags & (MY_WME | MY_FAE | MY_FNABP)) { if (readbytes == (size_t) -1) @@ -97,8 +107,10 @@ size_t my_pread(File Filedes, uchar *Buffer, size_t Count, my_off_t offset, DBUG_RETURN(MY_FILE_ERROR); /* Return with error */ } if (MyFlags & (MY_NABP | MY_FNABP)) - DBUG_RETURN(0); /* Read went ok; Return 0 */ - DBUG_RETURN(readbytes); /* purecov: inspected */ + readbytes= 0; /* Read went ok; Return 0 */ + else + readbytes+= save_count; + DBUG_RETURN(readbytes); } } /* my_pread */ diff --git a/mysys/my_read.c b/mysys/my_read.c index 883a1c5fdc7..47f2d725f65 100644 --- a/mysys/my_read.c +++ b/mysys/my_read.c @@ -35,17 +35,16 @@ size_t my_read(File Filedes, uchar *Buffer, size_t Count, myf MyFlags) { - size_t readbytes, save_count; + size_t readbytes, save_count= 0; DBUG_ENTER("my_read"); - DBUG_PRINT("my",("fd: %d Buffer: %p Count: %lu MyFlags: %d", - Filedes, Buffer, (ulong) Count, MyFlags)); - save_count= Count; + DBUG_PRINT("my",("fd: %d Buffer: %p Count: %lu MyFlags: %lu", + Filedes, Buffer, (ulong) Count, (ulong) MyFlags)); if (!(MyFlags & (MY_WME | MY_FAE | MY_FNABP))) MyFlags|= my_global_flags; for (;;) { - errno= 0; /* Linux, Windows don't reset this on EOF/success */ + errno= 0; /* Linux, Windows don't reset this on EOF/success */ #ifdef _WIN32 readbytes= my_win_read(Filedes, Buffer, Count); #else @@ -61,47 +60,52 @@ size_t my_read(File Filedes, uchar *Buffer, size_t Count, myf MyFlags) if (readbytes != Count) { - my_errno= errno; - if (errno == 0 || (readbytes != (size_t) -1 && - (MyFlags & (MY_NABP | MY_FNABP)))) - my_errno= HA_ERR_FILE_TOO_SHORT; + int got_errno= my_errno= errno; DBUG_PRINT("warning",("Read only %d bytes off %lu from %d, errno: %d", (int) readbytes, (ulong) Count, Filedes, - my_errno)); + got_errno)); + + if (got_errno == 0 || (readbytes != (size_t) -1 && + (MyFlags & (MY_NABP | MY_FNABP)))) + my_errno= HA_ERR_FILE_TOO_SHORT; - if ((readbytes == 0 || (int) readbytes == -1) && errno == EINTR) - { + if ((readbytes == 0 || (int) readbytes == -1) && got_errno == EINTR) + { DBUG_PRINT("debug", ("my_read() was interrupted and returned %ld", (long) readbytes)); continue; /* Interrupted */ } + /* Do a read retry if we didn't get enough data on first read */ + if (readbytes != (size_t) -1 && readbytes != 0 && + (MyFlags & MY_FULL_IO)) + { + Buffer+= readbytes; + Count-= readbytes; + save_count+= readbytes; + continue; + } + if (MyFlags & (MY_WME | MY_FAE | MY_FNABP)) { if (readbytes == (size_t) -1) my_error(EE_READ, MYF(ME_BELL | ME_WAITTANG | (MyFlags & (ME_JUST_INFO | ME_NOREFRESH))), - my_filename(Filedes),my_errno); + my_filename(Filedes), got_errno); else if (MyFlags & (MY_NABP | MY_FNABP)) my_error(EE_EOFERR, MYF(ME_BELL | ME_WAITTANG | (MyFlags & (ME_JUST_INFO | ME_NOREFRESH))), - my_filename(Filedes),my_errno); + my_filename(Filedes), got_errno); } if (readbytes == (size_t) -1 || ((MyFlags & (MY_FNABP | MY_NABP)) && !(MyFlags & MY_FULL_IO))) - DBUG_RETURN(MY_FILE_ERROR); /* Return with error */ - if (readbytes != (size_t) -1 && (MyFlags & MY_FULL_IO)) - { - Buffer+= readbytes; - Count-= readbytes; - continue; - } + DBUG_RETURN(MY_FILE_ERROR); /* Return with error */ } if (MyFlags & (MY_NABP | MY_FNABP)) - readbytes= 0; /* Ok on read */ - else if (MyFlags & MY_FULL_IO) - readbytes= save_count; + readbytes= 0; /* Ok on read */ + else + readbytes+= save_count; break; } DBUG_RETURN(readbytes); |