diff options
| author | tegge <tegge@FreeBSD.org> | 2003-03-26 23:40:42 +0000 |
|---|---|---|
| committer | tegge <tegge@FreeBSD.org> | 2003-03-26 23:40:42 +0000 |
| commit | ede5ebede767d6fee0a2d6efee34a51cc7b61bb7 (patch) | |
| tree | b84c95f715ab6a5b3a21a9fb5fb5b689068fd91d /sys/kern | |
| parent | 5e14826743f78c1b683ca05407f54b99a075c1de (diff) | |
| download | FreeBSD-src-ede5ebede767d6fee0a2d6efee34a51cc7b61bb7.zip FreeBSD-src-ede5ebede767d6fee0a2d6efee34a51cc7b61bb7.tar.gz | |
Add support for reading directly from file to userland buffer when the
O_DIRECT descriptor status flag is set and both offset and length is a
multiple of the physical media sector size.
Diffstat (limited to 'sys/kern')
| -rw-r--r-- | sys/kern/vfs_bio.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c index f904aec..82db7f4 100644 --- a/sys/kern/vfs_bio.c +++ b/sys/kern/vfs_bio.c @@ -52,6 +52,8 @@ #include <vm/vm_object.h> #include <vm/vm_extern.h> #include <vm/vm_map.h> +#include "opt_directio.h" +#include "opt_swap.h" static MALLOC_DEFINE(M_BIOBUF, "BIO buffer", "BIO buffer"); @@ -246,6 +248,9 @@ const char *buf_wmesg = BUF_WMESG; #define VFS_BIO_NEED_FREE 0x04 /* wait for free bufs, hi hysteresis */ #define VFS_BIO_NEED_BUFSPACE 0x08 /* wait for buf space, lo hysteresis */ +#ifdef DIRECTIO +extern void ffs_rawread_setup(void); +#endif /* DIRECTIO */ /* * numdirtywakeup: * @@ -463,6 +468,13 @@ kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est) * We have no less then 16 and no more then 256. */ nswbuf = max(min(nbuf/4, 256), 16); +#ifdef NSWBUF_MIN + if (nswbuf < NSWBUF_MIN) + nswbuf = NSWBUF_MIN; +#endif +#ifdef DIRECTIO + ffs_rawread_setup(); +#endif /* * Reserve space for the buffer cache buffers |
