diff options
| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-09-29 17:15:37 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-10-02 13:15:21 -0700 |
| commit | b32f4c7ed85c5cee2a21a55c9f59ebc9d57a2463 (patch) | |
| tree | 547896c5f54e03ba8635ae22b35f4d534b2272fe /drivers/target/target_core_file.h | |
| parent | f25590f39d543272f7ae7b00d533359c8d7ff331 (diff) | |
target/file: Re-enable optional fd_buffered_io=1 operation
This patch re-adds the ability to optionally run in buffered FILEIO mode
(eg: w/o O_DSYNC) for device backends in order to once again use the
Linux buffered cache as a write-back storage mechanism.
This logic was originally dropped with mainline v3.5-rc commit:
commit a4dff3043c231d57f982af635c9d2192ee40e5ae
Author: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Wed May 30 16:25:41 2012 -0700
target/file: Use O_DSYNC by default for FILEIO backends
This difference with this patch is that fd_create_virtdevice() now
forces the explicit setting of emulate_write_cache=1 when buffered FILEIO
operation has been enabled.
(v2: Switch to FDBD_HAS_BUFFERED_IO_WCE + add more detailed
comment as requested by hch)
Reported-by: Ferry <iscsitmp@bananateam.nl>
Cc: Christoph Hellwig <hch@lst.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_file.h')
| -rw-r--r-- | drivers/target/target_core_file.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/target/target_core_file.h b/drivers/target/target_core_file.h index 70ce7fd7111..876ae53ef5b 100644 --- a/drivers/target/target_core_file.h +++ b/drivers/target/target_core_file.h @@ -14,6 +14,7 @@ #define FBDF_HAS_PATH 0x01 #define FBDF_HAS_SIZE 0x02 +#define FDBD_HAS_BUFFERED_IO_WCE 0x04 struct fd_dev { u32 fbd_flags; |