Messages in this thread Patch in this message | | | Date | Sat, 29 Aug 2009 19:03:33 -0400 | From | Christoph Hellwig <> | Subject | [PATCH 1/7] Make DISCARD_BARRIER and DISCARD_NOBARRIER writes instead of reads |
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From: David Woodhouse <dwmw2@infradead.org>
The commands are conceptually writes, and in the case of IDE and SCSI commands actually are writes. They were only reads because we thought that would interact better with the elevators. Now the elevators know about discard requests, that advantage no longer exists.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Matthew Wilcox <willy@linux.intel.com> ---
diff --git a/include/linux/fs.h b/include/linux/fs.h index 5bed436..28f8e5d 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -161,8 +161,8 @@ struct inodes_stat_t { * These aren't really reads or writes, they pass down information about * parts of device that are now unused by the file system. */ -#define DISCARD_NOBARRIER (1 << BIO_RW_DISCARD) -#define DISCARD_BARRIER ((1 << BIO_RW_DISCARD) | (1 << BIO_RW_BARRIER)) +#define DISCARD_NOBARRIER (WRITE | (1 << BIO_RW_DISCARD)) +#define DISCARD_BARRIER (DISCARD_NOBARRIER | (1 << BIO_RW_BARRIER)) #define SEL_IN 1 #define SEL_OUT 2
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