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authorTrond Myklebust <trond.myklebust@hammerspace.com>2020-04-13 22:55:21 +0300
committerTrond Myklebust <trond.myklebust@hammerspace.com>2020-04-13 22:55:21 +0300
commitfbf4bcc9a8373122881909331f2f9566a128126e (patch)
tree8ab1e8a6c18cc76d2e520dc6095cbead15847f81 /fs/nfs
parent8f3d9f354286745c751374f5f1fcafee6b3f3136 (diff)
downloadlinux-fbf4bcc9a8373122881909331f2f9566a128126e.tar.xz
NFS: Fix an ABBA spinlock issue in pnfs_update_layout()
We need to drop the inode spinlock while calling nfs4_select_rw_stateid(), since nfs4_copy_delegation_stateid() could take the delegation lock. Note that it is safe to do this, since all other calls to pnfs_update_layout() for that inode will find themselves blocked by the lock we hold on NFS_LAYOUT_FIRST_LAYOUTGET. Fixes: fc51b1cf391d ("NFS: Beware when dereferencing the delegation cred") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/pnfs.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index f2dc35c22964..b8d78f393365 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -2023,6 +2023,7 @@ lookup_again:
goto lookup_again;
}
+ spin_unlock(&ino->i_lock);
first = true;
status = nfs4_select_rw_stateid(ctx->state,
iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
@@ -2032,12 +2033,12 @@ lookup_again:
trace_pnfs_update_layout(ino, pos, count,
iomode, lo, lseg,
PNFS_UPDATE_LAYOUT_INVALID_OPEN);
- spin_unlock(&ino->i_lock);
nfs4_schedule_stateid_recovery(server, ctx->state);
pnfs_clear_first_layoutget(lo);
pnfs_put_layout_hdr(lo);
goto lookup_again;
}
+ spin_lock(&ino->i_lock);
} else {
nfs4_stateid_copy(&stateid, &lo->plh_stateid);
}