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9p fid refcount: add p9_fid_get/put wrappers

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I was recently reminded that it is not clear that p9_client_clunk()
was actually just decrementing refcount and clunking only when that
reaches zero: make it clear through a set of helpers.

This will also allow instrumenting refcounting better for debugging
next patch

Link: https://lkml.kernel.org/r/20220612085330.1451496-5-asmadeus@codewreck.org
Reviewed-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Reviewed-by: Christian Schoenebeck <linux_oss@crudebyte.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
This commit is contained in:
Dominique Martinet
2022-06-12 13:42:32 +09:00
committed by Dominique Martinet
parent b296d05746
commit b48dbb998d
12 changed files with 100 additions and 81 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
net/9p/client.c
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@@ -1228,7 +1228,7 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
clunk_fid:
kfree(wqids);
p9_client_clunk(fid);
p9_fid_put(fid);
fid = NULL;
error:
@@ -1459,15 +1459,6 @@ int p9_client_clunk(struct p9_fid *fid)
struct p9_req_t *req;
int retries = 0;
if (!fid || IS_ERR(fid)) {
pr_warn("%s (%d): Trying to clunk with invalid fid\n",
__func__, task_pid_nr(current));
dump_stack();
return 0;
}
if (!refcount_dec_and_test(&fid->count))
return 0;
again:
p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n",
fid->fid, retries);
@@ -1519,7 +1510,7 @@ int p9_client_remove(struct p9_fid *fid)
p9_tag_remove(clnt, req);
error:
if (err == -ERESTARTSYS)
p9_client_clunk(fid);
p9_fid_put(fid);
else
p9_fid_destroy(fid);
return err;
@@ -2042,7 +2033,7 @@ struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
attr_fid->fid, *attr_size);
return attr_fid;
clunk_fid:
p9_client_clunk(attr_fid);
p9_fid_put(attr_fid);
attr_fid = NULL;
error:
if (attr_fid && attr_fid != file_fid)