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Subject[PATCH 1/2] fs: add RWF_IOPRIO
Date
From: Adam Manzanares <adam.manzanares@wdc.com>

This is the per-I/O equivalent of the ioprio_set system call.

When the RWF_IOPRIO flag is set then the aio_reqprio field of the iocb
is interpreted as an I/O scheduling class and priority.

Signed-off-by: Adam Manzanares <adam.manzanares@wdc.com>
---
include/linux/fs.h | 4 ++++
include/uapi/linux/fs.h | 5 ++++-
2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 760d8da1b6c7..32614eb72a4a 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -292,6 +292,7 @@ enum rw_hint {
#define IOCB_SYNC (1 << 5)
#define IOCB_WRITE (1 << 6)
#define IOCB_NOWAIT (1 << 7)
+#define IOCB_IOPRIO (1 << 8)

struct kiocb {
struct file *ki_filp;
@@ -300,6 +301,7 @@ struct kiocb {
void *private;
int ki_flags;
enum rw_hint ki_hint;
+ u16 ki_ioprio; /* See linux/ioprio.h */
} __randomize_layout;

static inline bool is_sync_kiocb(struct kiocb *kiocb)
@@ -3243,6 +3245,8 @@ static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags)
ki->ki_flags |= (IOCB_DSYNC | IOCB_SYNC);
if (flags & RWF_APPEND)
ki->ki_flags |= IOCB_APPEND;
+ if (flags & RWF_IOPRIO)
+ ki->ki_flags |= IOCB_IOPRIO;
return 0;
}

diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index d2a8313fabd7..c8f69a00b566 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -380,8 +380,11 @@ typedef int __bitwise __kernel_rwf_t;
/* per-IO O_APPEND */
#define RWF_APPEND ((__force __kernel_rwf_t)0x00000010)

+/* per-IO IOPRIO */
+#define RWF_IOPRIO ((__force __kernel_rwf_t)0x00000020)
+
/* mask of flags supported by the kernel */
#define RWF_SUPPORTED (RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\
- RWF_APPEND)
+ RWF_APPEND | RWF_IOPRIO)

#endif /* _UAPI_LINUX_FS_H */
--
2.15.1
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