diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/Kbuild | 1 | ||||
| -rw-r--r-- | include/linux/fs.h | 119 |
2 files changed, 59 insertions, 61 deletions
diff --git a/include/linux/Kbuild b/include/linux/Kbuild index d114db9477f..e2a1346514a 100644 --- a/include/linux/Kbuild +++ b/include/linux/Kbuild @@ -69,7 +69,6 @@ header-y += b1lli.h header-y += baycom.h header-y += bfs_fs.h header-y += binfmts.h -header-y += blk_types.h header-y += blkpg.h header-y += blktrace_api.h header-y += bpqether.h diff --git a/include/linux/fs.h b/include/linux/fs.h index 65fbf571023..8cb86cfc971 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -8,7 +8,6 @@ #include <linux/limits.h> #include <linux/ioctl.h> -#include <linux/blk_types.h> #include <linux/types.h> /* @@ -118,65 +117,6 @@ struct inodes_stat_t { #define FMODE_NONOTIFY ((__force fmode_t)0x1000000) /* - * The below are the various read and write types that we support. Some of - * them include behavioral modifiers that send information down to the - * block layer and IO scheduler. Terminology: - * - * The block layer uses device plugging to defer IO a little bit, in - * the hope that we will see more IO very shortly. This increases - * coalescing of adjacent IO and thus reduces the number of IOs we - * have to send to the device. It also allows for better queuing, - * if the IO isn't mergeable. If the caller is going to be waiting - * for the IO, then he must ensure that the device is unplugged so - * that the IO is dispatched to the driver. - * - * All IO is handled async in Linux. This is fine for background - * writes, but for reads or writes that someone waits for completion - * on, we want to notify the block layer and IO scheduler so that they - * know about it. That allows them to make better scheduling - * decisions. So when the below references 'sync' and 'async', it - * is referencing this priority hint. - * - * With that in mind, the available types are: - * - * READ A normal read operation. Device will be plugged. - * READ_SYNC A synchronous read. Device is not plugged, caller can - * immediately wait on this read without caring about - * unplugging. - * READA Used for read-ahead operations. Lower priority, and the - * block layer could (in theory) choose to ignore this - * request if it runs into resource problems. - * WRITE A normal async write. Device will be plugged. - * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down - * the hint that someone will be waiting on this IO - * shortly. The write equivalent of READ_SYNC. - * WRITE_ODIRECT Special case write for O_DIRECT only. - * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush. - * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on - * non-volatile media on completion. - * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded - * by a cache flush and data is guaranteed to be on - * non-volatile media on completion. - * - */ -#define RW_MASK REQ_WRITE -#define RWA_MASK REQ_RAHEAD - -#define READ 0 -#define WRITE RW_MASK -#define READA RWA_MASK -#define KERNEL_READ (READ|REQ_KERNEL) -#define KERNEL_WRITE (WRITE|REQ_KERNEL) - -#define READ_SYNC (READ | REQ_SYNC) -#define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE) -#define WRITE_ODIRECT (WRITE | REQ_SYNC) -#define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH) -#define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA) -#define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA) - - -/* * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector * that indicates that they should check the contents of the iovec are * valid, but not check the memory that the iovec elements @@ -417,6 +357,7 @@ struct inodes_stat_t { #include <linux/uidgid.h> #include <linux/lockdep.h> #include <linux/percpu-rwsem.h> +#include <linux/blk_types.h> #include <asm/byteorder.h> @@ -454,6 +395,64 @@ typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, bool is_async); /* + * The below are the various read and write types that we support. Some of + * them include behavioral modifiers that send information down to the + * block layer and IO scheduler. Terminology: + * + * The block layer uses device plugging to defer IO a little bit, in + * the hope that we will see more IO very shortly. This increases + * coalescing of adjacent IO and thus reduces the number of IOs we + * have to send to the device. It also allows for better queuing, + * if the IO isn't mergeable. If the caller is going to be waiting + * for the IO, then he must ensure that the device is unplugged so + * that the IO is dispatched to the driver. + * + * All IO is handled async in Linux. This is fine for background + * writes, but for reads or writes that someone waits for completion + * on, we want to notify the block layer and IO scheduler so that they + * know about it. That allows them to make better scheduling + * decisions. So when the below references 'sync' and 'async', it + * is referencing this priority hint. + * + * With that in mind, the available types are: + * + * READ A normal read operation. Device will be plugged. + * READ_SYNC A synchronous read. Device is not plugged, caller can + * immediately wait on this read without caring about + * unplugging. + * READA Used for read-ahead operations. Lower priority, and the + * block layer could (in theory) choose to ignore this + * request if it runs into resource problems. + * WRITE A normal async write. Device will be plugged. + * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down + * the hint that someone will be waiting on this IO + * shortly. The write equivalent of READ_SYNC. + * WRITE_ODIRECT Special case write for O_DIRECT only. + * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush. + * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on + * non-volatile media on completion. + * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded + * by a cache flush and data is guaranteed to be on + * non-volatile media on completion. + * + */ +#define RW_MASK REQ_WRITE +#define RWA_MASK REQ_RAHEAD + +#define READ 0 +#define WRITE RW_MASK +#define READA RWA_MASK +#define KERNEL_READ (READ|REQ_KERNEL) +#define KERNEL_WRITE (WRITE|REQ_KERNEL) + +#define READ_SYNC (READ | REQ_SYNC) +#define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE) +#define WRITE_ODIRECT (WRITE | REQ_SYNC) +#define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH) +#define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA) +#define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA) + +/* * Attribute flags. These should be or-ed together to figure out what * has been changed! */ |