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Some partitioning schemes want to have partitions that are aligned

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with geometry. And they do recalculation of user specified parameters.
MBR, PC98, VTOC8, EBR schemes are doing that. For these schemes an
auto alignment feature (ie. gpart add -a alignment) would not work.
But it can work for GPT and BSD schemes. BSD scheme usualy is created
inside MBR, so we can use knowledge about offset of MBR partition to
calculate aligned values for BSD partitions.

Use "offset" attribute of the parent provider for better alignment.

MFC after:	2 weeks
This commit is contained in:
Andrey V. Elsukov 2011-05-15 16:16:48 +00:00
parent e9d1191f6a
commit 6c7e04f0f3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=221967
1 changed files with 14 additions and 10 deletions
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24
sbin/geom/class/part/geom_part.c
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@ -416,7 +416,7 @@ gpart_autofill(struct gctl_req *req)
struct gprovider *pp;
off_t first, last, a_first;
off_t size, start, a_lba;
off_t lba, len, alignment;
off_t lba, len, alignment, offset;
uintmax_t grade;
const char *s;
int error, has_size, has_start, has_alignment;
@ -467,8 +467,6 @@ gpart_autofill(struct gctl_req *req)
error = g_parse_lba(s, pp->lg_sectorsize, &size);
if (error)
errc(EXIT_FAILURE, error, "Invalid size param");
if (size > alignment)
size = ALIGNDOWN(size, alignment);
}
s = gctl_get_ascii(req, "start");
@ -478,22 +476,29 @@ gpart_autofill(struct gctl_req *req)
error = g_parse_lba(s, pp->lg_sectorsize, &start);
if (error)
errc(EXIT_FAILURE, error, "Invalid start param");
start = ALIGNUP(start, alignment);
}
/* No autofill necessary. */
if (has_size && has_start && !has_alignment)
goto done;
/* Adjust parameters to offset value for better alignment */
s = find_provcfg(pp, "offset");
offset = (s == NULL) ? 0:
(off_t)strtoimax(s, NULL, 0) / pp->lg_sectorsize;
start = ALIGNUP(start + offset, alignment);
if (size + offset > alignment)
size = ALIGNDOWN(size + offset, alignment);
first = (off_t)strtoimax(find_geomcfg(gp, "first"), NULL, 0);
last = (off_t)strtoimax(find_geomcfg(gp, "last"), NULL, 0);
grade = ~0ULL;
a_first = ALIGNUP(first, alignment);
last = ALIGNDOWN(last, alignment);
a_first = ALIGNUP(first + offset, alignment);
last = ALIGNDOWN(last + offset, alignment);
while ((pp = find_provider(gp, first)) != NULL) {
s = find_provcfg(pp, "start");
lba = (off_t)strtoimax(s, NULL, 0);
a_lba = ALIGNDOWN(lba, alignment);
a_lba = ALIGNDOWN(lba + offset, alignment);
if (first < a_lba && a_first < a_lba) {
/* Free space [first, lba> */
len = a_lba - a_first;
@ -519,7 +524,7 @@ gpart_autofill(struct gctl_req *req)
s = find_provcfg(pp, "end");
first = (off_t)strtoimax(s, NULL, 0) + 1;
a_first = ALIGNUP(first, alignment);
a_first = ALIGNUP(first + offset, alignment);
}
if (a_first <= last) {
/* Free space [first-last] */
@ -543,12 +548,11 @@ gpart_autofill(struct gctl_req *req)
}
}
}
if (grade == ~0ULL) {
geom_deletetree(&mesh);
return (ENOSPC);
}
start -= offset; /* Return back to real offset */
done:
snprintf(ssize, sizeof(ssize), "%jd", (intmax_t)size);
gctl_change_param(req, "size", -1, ssize);