@@ -216,6 +216,36 @@ nfsd_file_free(struct nfsd_file *nf)
return flush;
}
+static bool
+nfsd_file_check_writeback(struct nfsd_file *nf)
+{
+ struct file *file = nf->nf_file;
+ struct address_space *mapping;
+
+ if (!file || !(file->f_mode & FMODE_WRITE))
+ return false;
+ mapping = file->f_mapping;
+ return mapping_tagged(mapping, PAGECACHE_TAG_DIRTY) ||
+ mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK);
+}
+
+static int
+nfsd_file_check_write_error(struct nfsd_file *nf)
+{
+ struct file *file = nf->nf_file;
+
+ if (!file || !(file->f_mode & FMODE_WRITE))
+ return 0;
+ return filemap_check_wb_err(file->f_mapping, READ_ONCE(file->f_wb_err));
+}
+
+static bool
+nfsd_file_in_use(struct nfsd_file *nf)
+{
+ return nfsd_file_check_writeback(nf) ||
+ nfsd_file_check_write_error(nf);
+}
+
static void
nfsd_file_do_unhash(struct nfsd_file *nf)
{
@@ -223,6 +253,8 @@ nfsd_file_do_unhash(struct nfsd_file *nf)
trace_nfsd_file_unhash(nf);
+ if (nfsd_file_check_write_error(nf))
+ nfsd_reset_boot_verifier(net_generic(nf->nf_net, nfsd_net_id));
--nfsd_file_hashtbl[nf->nf_hashval].nfb_count;
hlist_del_rcu(&nf->nf_node);
if (!list_empty(&nf->nf_lru))
@@ -277,9 +309,10 @@ void
nfsd_file_put(struct nfsd_file *nf)
{
bool is_hashed = test_bit(NFSD_FILE_HASHED, &nf->nf_flags) != 0;
+ bool unused = !nfsd_file_in_use(nf);
set_bit(NFSD_FILE_REFERENCED, &nf->nf_flags);
- if (nfsd_file_put_noref(nf) == 1 && is_hashed)
+ if (nfsd_file_put_noref(nf) == 1 && is_hashed && unused)
nfsd_file_schedule_laundrette(NFSD_FILE_LAUNDRETTE_MAY_FLUSH);
}
@@ -345,6 +378,14 @@ nfsd_file_lru_cb(struct list_head *item, struct list_lru_one *lru,
*/
if (atomic_read(&nf->nf_ref) > 1)
goto out_skip;
+
+ /*
+ * Don't throw out files that are still undergoing I/O or
+ * that have uncleared errors pending.
+ */
+ if (nfsd_file_check_writeback(nf))
+ goto out_skip;
+
if (test_and_clear_bit(NFSD_FILE_REFERENCED, &nf->nf_flags))
goto out_rescan;
If a file may contain unstable writes that can error out, then we want to avoid garbage collecting the struct nfsd_file that may be tracking those errors. So in the garbage collector, we try to avoid collecting files that aren't clean. Furthermore, we avoid immediately kicking off the garbage collector in the case where the reference drops to zero for the case where there is a write error that is being tracked. If the file is unhashed while an error is pending, then declare a reboot, to ensure the client resends any unstable writes. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> --- fs/nfsd/filecache.c | 43 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 42 insertions(+), 1 deletion(-)