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storage: Reuse already open caller objects

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In the event that the remote crashes, or for other reasons try to open a
partition that we already have open we should reuse the caller objects,
so that we don't run out of them. This should likely be replaced by a
working mechanism for notifications when the remote is going away.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Bjorn Andersson
2016-11-21 19:12:12 +00:00
parent d28f52c246
commit 8c79959935
1 changed files with 13 additions and 1 deletions
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14
storage.c
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@@ -19,6 +19,7 @@ struct caller {
unsigned node;
int fd;
unsigned dev_error;
const struct partition *partition;
};
static const struct partition partition_table[] = {
@@ -46,7 +47,7 @@ int storage_open(void)
int storage_get(unsigned node, const char *path)
{
const struct partition *part;
struct caller *caller;
struct caller *caller = NULL;
int saved_errno;
int fd;
int i;
@@ -60,6 +61,14 @@ int storage_get(unsigned node, const char *path)
return -EPERM;
found:
/* Check if this node already has the requested path open */
for (i = 0; i < MAX_CALLERS; i++) {
if (caller_handles[i].fd != -1 &&
caller_handles[i].node == node &&
caller_handles[i].partition == part)
return caller_handles[i].id;
}
for (i = 0; i < MAX_CALLERS; i++) {
if (caller_handles[i].fd == -1) {
caller = &caller_handles[i];
@@ -81,6 +90,7 @@ found:
caller->node = node;
caller->fd = fd;
caller->partition = part;
return caller->id;
}
@@ -98,6 +108,8 @@ int storage_put(unsigned node, int caller_id)
close(caller->fd);
caller->fd = -1;
caller->partition = NULL;
return 0;
}