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metadata: format_text: better check for metadata overlap

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Actually, we don't need extra condition as introduced in commit
00348c0a63. We should fix the last
condition:

  (mdac->rlocn.size >= mdah->size)

...which should be:

  (MDA_HEADER_SIZE + (rlocn ? rlocn->size : 0) + mdac->rlocn.size >= mdah->size))

Where the "mdac" is new metadata, the "rlocn" is old metadata.

So the main problem with the previous condition was that it
didn't count in MDA_HEADER_SIZE properly (and possible existing
metadata - the "rlocn"). This could have caused the error state
where metadata in ring buffer overlap to not be hit.

Replace the new condition introduced in 00348c0a63
with the improved one for the condition that existed there
already but it was just incomplete.
This commit is contained in:
Peter Rajnoha 2015-10-30 08:57:34 +01:00
parent 406d8ff332
commit c2e88d1107
1 changed files with 1 additions and 2 deletions
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3
lib/format_text/format-text.c
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@ -654,8 +654,7 @@ static int _vg_write_raw(struct format_instance *fid, struct volume_group *vg,
if ((new_wrap && old_wrap) ||
(rlocn && (new_wrap || old_wrap) && (new_end > rlocn->offset)) ||
(!rlocn && new_wrap && (new_end > mdac->rlocn.offset)) ||
(mdac->rlocn.size >= mdah->size)) {
(MDA_HEADER_SIZE + (rlocn ? rlocn->size : 0) + mdac->rlocn.size >= mdah->size)) {
log_error("VG %s metadata too large for circular buffer",
vg->name);
goto out;