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NFS: Add a tracepoint in nfs_fh_to_dentry()

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Add a tracepoint in nfs_fh_to_dentry() for debugging issues with bad
userspace filehandles.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2019-11-01 15:33:55 -04:00
parent 70d136b2dc
commit 43622eab8d
2 changed files with 34 additions and 0 deletions
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1
fs/nfs/export.c
View File

@ -105,6 +105,7 @@ nfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
ret = rpc_ops->getattr(NFS_SB(sb), server_fh, fattr, label, NULL);
if (ret) {
dprintk("%s: getattr failed %d\n", __func__, ret);
trace_nfs_fh_to_dentry(sb, server_fh, fattr->fileid, ret);
dentry = ERR_PTR(ret);
goto out_free_label;
}

33
fs/nfs/nfstrace.h
View File

@ -1065,6 +1065,39 @@ TRACE_EVENT(nfs_commit_done,
)
);
TRACE_EVENT(nfs_fh_to_dentry,
TP_PROTO(
const struct super_block *sb,
const struct nfs_fh *fh,
u64 fileid,
int error
),
TP_ARGS(sb, fh, fileid, error),
TP_STRUCT__entry(
__field(int, error)
__field(dev_t, dev)
__field(u32, fhandle)
__field(u64, fileid)
),
TP_fast_assign(
__entry->error = error;
__entry->dev = sb->s_dev;
__entry->fileid = fileid;
__entry->fhandle = nfs_fhandle_hash(fh);
),
TP_printk(
"error=%d fileid=%02x:%02x:%llu fhandle=0x%08x ",
__entry->error,
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long long)__entry->fileid,
__entry->fhandle
)
);
TRACE_DEFINE_ENUM(NFS_OK);
TRACE_DEFINE_ENUM(NFSERR_PERM);
TRACE_DEFINE_ENUM(NFSERR_NOENT);