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libi386: remove BD_SUPPORT_FRAGS

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BD_SUPPORT_FRAGS is preprocessor knob to allow partial reads in bioscd/biosdisk
level. However, we already have support for partial reads in bcache, and there
is no need to have duplication via preprocessor controls.

Note that bioscd/biosdisk interface is assumed to perform IO in 512B blocks,
so the only translation we have to do is 512 <-> native block size.

Differential Revision:	https://reviews.freebsd.org/D16600
This commit is contained in:
Toomas Soome 2018-08-15 21:21:16 +00:00
parent 99a9cf5164
commit 4273aef54d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=337872
2 changed files with 0 additions and 41 deletions
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20
stand/i386/libi386/bioscd.c
View File

@ -258,15 +258,9 @@ bc_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size,
struct i386_devdesc *dev;
int unit;
int blks;
#ifdef BD_SUPPORT_FRAGS
char fragbuf[BIOSCD_SECSIZE];
size_t fragsize;
fragsize = size % BIOSCD_SECSIZE;
#else
if (size % BIOSCD_SECSIZE)
return (EINVAL);
#endif
if ((rw & F_MASK) != F_READ)
return(EROFS);
@ -290,20 +284,6 @@ bc_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size,
return (0);
}
}
#ifdef BD_SUPPORT_FRAGS
DEBUG("frag read %d from %lld+%d to %p",
fragsize, dblk, blks, buf + (blks * BIOSCD_SECSIZE));
if (fragsize && bc_read(unit, dblk + blks, 1, fragbuf) != 1) {
if (blks) {
if (rsize)
*rsize = blks * BIOSCD_SECSIZE;
return (0);
}
DEBUG("frag read error");
return(EIO);
}
bcopy(fragbuf, buf + (blks * BIOSCD_SECSIZE), fragsize);
#endif
if (rsize)
*rsize = size;
return (0);

21
stand/i386/libi386/biosdisk.c
View File

@ -451,17 +451,11 @@ bd_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size,
struct disk_devdesc *dev = (struct disk_devdesc *)devdata;
uint64_t disk_blocks;
int blks, rc;
#ifdef BD_SUPPORT_FRAGS /* XXX: sector size */
char fragbuf[BIOSDISK_SECSIZE];
size_t fragsize;
fragsize = size % BIOSDISK_SECSIZE;
#else
if (size % BD(dev).bd_sectorsize) {
panic("bd_strategy: %d bytes I/O not multiple of block size",
size);
}
#endif
DEBUG("open_disk %p", dev);
@ -520,15 +514,6 @@ bd_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size,
}
return (EIO);
}
#ifdef BD_SUPPORT_FRAGS /* XXX: sector size */
DEBUG("bd_strategy: frag read %d from %d+%d to %p",
fragsize, dblk, blks, buf + (blks * BIOSDISK_SECSIZE));
if (fragsize && bd_read(od, dblk + blks, 1, fragsize)) {
DEBUG("frag read error");
return (EIO);
}
bcopy(fragbuf, buf + (blks * BIOSDISK_SECSIZE), fragsize);
#endif
break;
case F_WRITE :
DEBUG("write %d from %lld to %p", blks, dblk, buf);
@ -537,12 +522,6 @@ bd_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size,
DEBUG("write error");
return (EIO);
}
#ifdef BD_SUPPORT_FRAGS
if (fragsize) {
DEBUG("Attempted to write a frag");
return (EIO);
}
#endif
break;
default:
/* DO NOTHING */