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| author | Benjamin Coddington <bcodding@redhat.com> | 2017-01-05 10:20:16 -0500 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2017-01-12 12:51:29 -0500 |
| commit | 4b09ec4b14a168bf2c687e1f598140c3c11e9222 (patch) | |
| tree | f52a87c8690567266fa29b829ec231303f7cbe0d /fs | |
| parent | a121103c922847ba5010819a3f250f1f7fc84ab8 (diff) | |
| download | linux-0-day-4b09ec4b14a168bf2c687e1f598140c3c11e9222.tar.gz linux-0-day-4b09ec4b14a168bf2c687e1f598140c3c11e9222.tar.xz | |
nfs: Don't take a reference on fl->fl_file for LOCK operation
I have reports of a crash that look like __fput() was called twice for
a NFSv4.0 file. It seems possible that the state manager could try to
reclaim a lock and take a reference on the fl->fl_file at the same time the
file is being released if, during the close(), a signal interrupts the wait
for outstanding IO while removing locks which then skips the removal
of that lock.
Since 83bfff23e9ed ("nfs4: have do_vfs_lock take an inode pointer") has
removed the need to traverse fl->fl_file->f_inode in nfs4_lock_done(),
taking that reference is no longer necessary.
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfs/nfs4proc.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 6dcbc5defb7a8..700ed1fc10759 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -38,7 +38,6 @@ #include <linux/mm.h> #include <linux/delay.h> #include <linux/errno.h> -#include <linux/file.h> #include <linux/string.h> #include <linux/ratelimit.h> #include <linux/printk.h> @@ -6127,7 +6126,6 @@ static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, p->server = server; atomic_inc(&lsp->ls_count); p->ctx = get_nfs_open_context(ctx); - get_file(fl->fl_file); memcpy(&p->fl, fl, sizeof(p->fl)); return p; out_free_seqid: @@ -6240,7 +6238,6 @@ static void nfs4_lock_release(void *calldata) nfs_free_seqid(data->arg.lock_seqid); nfs4_put_lock_state(data->lsp); put_nfs_open_context(data->ctx); - fput(data->fl.fl_file); kfree(data); dprintk("%s: done!\n", __func__); } |