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fs/ntfs3: Check possible errors in run_pack in advance

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Checking in advance speeds things up in some cases.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov 2022-07-06 20:17:28 +03:00
parent 54033c1350
commit e6d9398c07
No known key found for this signature in database
GPG Key ID: A9B0331F832407B6
1 changed files with 22 additions and 17 deletions
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39
fs/ntfs3/run.c
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@ -820,26 +820,36 @@ int run_pack(const struct runs_tree *run, CLST svcn, CLST len, u8 *run_buf,
CLST next_vcn, vcn, lcn;
CLST prev_lcn = 0;
CLST evcn1 = svcn + len;
const struct ntfs_run *r, *r_end;
int packed_size = 0;
size_t i;
bool ok;
s64 dlcn;
int offset_size, size_size, tmp;
next_vcn = vcn = svcn;
*packed_vcns = 0;
if (!len)
goto out;
ok = run_lookup_entry(run, vcn, &lcn, &len, &i);
/* Check all required entries [svcn, encv1) available. */
if (!run_lookup(run, svcn, &i))
return -ENOENT;
if (!ok)
goto error;
r_end = run->runs + run->count;
r = run->runs + i;
if (next_vcn != vcn)
goto error;
for (next_vcn = r->vcn + r->len; next_vcn < evcn1;
next_vcn = r->vcn + r->len) {
if (++r >= r_end || r->vcn != next_vcn)
return -ENOENT;
}
/* Repeat cycle above and pack runs. Assume no errors. */
r = run->runs + i;
len = svcn - r->vcn;
vcn = svcn;
lcn = r->lcn == SPARSE_LCN ? SPARSE_LCN : (r->lcn + len);
len = r->len - len;
for (;;) {
next_vcn = vcn + len;
@ -888,12 +898,10 @@ int run_pack(const struct runs_tree *run, CLST svcn, CLST len, u8 *run_buf,
if (packed_size + 1 >= run_buf_size || next_vcn >= evcn1)
goto out;
ok = run_get_entry(run, ++i, &vcn, &lcn, &len);
if (!ok)
goto error;
if (next_vcn != vcn)
goto error;
r += 1;
vcn = r->vcn;
lcn = r->lcn;
len = r->len;
}
out:
@ -902,9 +910,6 @@ out:
run_buf[0] = 0;
return packed_size + 1;
error:
return -EOPNOTSUPP;
}
/*