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Pad the bootcode we write to the partition to a multiple of the

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sector size.

Submitted by:	Alexey Shuvaev <shuvaev@physik.uni-wuerzburg.de>
Prompted by: 	delphij
MFC after:	3 days
This commit is contained in:
Marcel Moolenaar 2008-11-18 00:03:30 +00:00
parent d57af1ab1d
commit 0a4acb2e3d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=185038
1 changed files with 16 additions and 1 deletions
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17
sbin/geom/class/part/geom_part.c
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@ -393,6 +393,8 @@ gpart_write_partcode(struct gctl_req *req, int idx, void *code, ssize_t size)
struct ggeom *gp;
struct gprovider *pp;
const char *s;
char *buf;
off_t bsize;
int error, fd;
s = gctl_get_ascii(req, "class");
@ -428,8 +430,21 @@ gpart_write_partcode(struct gctl_req *req, int idx, void *code, ssize_t size)
errx(EXIT_FAILURE, "%s: not enough space", dsf);
if (lseek(fd, 0, SEEK_SET) != 0)
err(EXIT_FAILURE, "%s", dsf);
if (write(fd, code, size) != size)
/*
* When writing to a disk device, the write must be
* sector aligned and not write to any partial sectors,
* so round up the buffer size to the next sector and zero it.
*/
bsize = (size + pp->lg_sectorsize - 1) /
pp->lg_sectorsize * pp->lg_sectorsize;
buf = calloc(1, bsize);
if (buf == NULL)
err(EXIT_FAILURE, "%s", dsf);
bcopy(code, buf, size);
if (write(fd, buf, bsize) != bsize)
err(EXIT_FAILURE, "%s", dsf);
free(buf);
close(fd);
} else
errx(EXIT_FAILURE, "invalid partition index");