diff options
| -rw-r--r-- | NEWS | 3 | ||||
| -rw-r--r-- | doc/coreutils.texi | 8 | ||||
| -rw-r--r-- | src/dd.c | 12 |
3 files changed, 22 insertions, 1 deletions
@@ -4,6 +4,9 @@ GNU coreutils NEWS -*- outline -*- ** New features + dd accepts iflag=cio and oflag=cio to open the file in CIO (concurrent I/O) + mode where this feature is available. + ls --color now highlights hard linked files, too stat -f recognizes the Lustre file system type diff --git a/doc/coreutils.texi b/doc/coreutils.texi index 9047925e3..387377345 100644 --- a/doc/coreutils.texi +++ b/doc/coreutils.texi @@ -7729,6 +7729,14 @@ If you combine this flag with the @samp{of=@var{file}} operand, you should also specify @samp{conv=notrunc} unless you want the output file to be truncated before being appended to. +@item cio +@opindex cio +@cindex concurrent I/O +Use concurrent I/O mode for data. This mode performs direct I/O +and drops the @acronym{POSIX} requirement to serialize all I/O to the same file. +A file cannot be opened in CIO mode and with a standard open at the +same time. + @item direct @opindex direct @cindex direct I/O @@ -66,6 +66,12 @@ static void process_signals (void); # define SIGINFO SIGUSR1 #endif +/* This may belong in GNULIB's fcntl module instead. + Define O_CIO to 0 if it is not supported by this OS. */ +#ifndef O_CIO +# define O_CIO 0 +#endif + #if ! HAVE_FDATASYNC # define fdatasync(fd) (errno = ENOSYS, -1) #endif @@ -264,6 +270,7 @@ enum /* Use a value that is larger than that of any other O_ symbol. */ O_FULLBLOCK = ((MAX (O_APPEND, MAX (O_BINARY, + MAX (O_CIO, MAX (O_DIRECT, MAX (O_DIRECTORY, MAX (O_DSYNC, @@ -272,7 +279,7 @@ enum MAX (O_NOFOLLOW, MAX (O_NOLINKS, MAX (O_NONBLOCK, - MAX (O_SYNC, O_TEXT)))))))))))) << 1) + MAX (O_SYNC, O_TEXT))))))))))))) << 1) }; /* Ensure that we didn't shift it off the end. */ @@ -288,6 +295,7 @@ static struct symbol_value const flags[] = { {"append", O_APPEND}, {"binary", O_BINARY}, + {"cio", O_CIO}, {"direct", O_DIRECT}, {"directory", O_DIRECTORY}, {"dsync", O_DSYNC}, @@ -508,6 +516,8 @@ Each FLAG symbol may be:\n\ \n\ append append mode (makes sense only for output; conv=notrunc suggested)\n\ "), stdout); + if (O_CIO) + fputs (_(" cio use concurrent I/O for data\n"), stdout); if (O_DIRECT) fputs (_(" direct use direct I/O for data\n"), stdout); if (O_DIRECTORY) |