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[virtio-9p] Stop renaming files with similar name! 

v9fs_complete_rename() mistakenly renames files with similar name
as we don't check if the matched name is really an offspring.

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Signed-off-by: Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>
This commit is contained in:
Malahal Naineni 2011-06-01 12:35:11 +05:30 committed by Venkateswararao Jujjuri (JV)
parent 578c7b2ca8
commit 936532a492
1 changed files with 20 additions and 4 deletions
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24
hw/9pfs/virtio-9p.c
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@ -423,6 +423,22 @@ static void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs)
v9fs_string_sprintf(lhs, "%s", rhs->data);
}
/*
* Return TRUE if s1 is an ancestor of s2.
*
* E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d".
* As a special case, We treat s1 as ancestor of s2 if they are same!
*/
static int v9fs_path_is_ancestor(V9fsString *s1, V9fsString *s2)
{
if (!strncmp(s1->data, s2->data, s1->size)) {
if (s2->data[s1->size] == '\0' || s2->data[s1->size] == '/') {
return 1;
}
}
return 0;
}
static size_t v9fs_string_size(V9fsString *str)
{
return str->size;
@ -2805,13 +2821,13 @@ static int v9fs_complete_rename(V9fsState *s, V9fsRenameState *vs)
for (fidp = s->fid_list; fidp; fidp = fidp->next) {
if (vs->fidp == fidp) {
/*
* we replace name of this fid towards the end
* so that our below strcmp will work
* we replace name of this fid towards the end so
* that our below v9fs_path_is_ancestor check will
* work
*/
continue;
}
if (!strncmp(vs->fidp->path.data, fidp->path.data,
strlen(vs->fidp->path.data))) {
if (v9fs_path_is_ancestor(&vs->fidp->path, &fidp->path)) {
/* replace the name */
v9fs_fix_path(&fidp->path, &vs->name,
strlen(vs->fidp->path.data));