nfsd: protect lease-related nfs4_file fields with fi_lock
Currently these fields are protected with the state_lock, but that doesn't really make a lot of sense. These fields are "private" to the nfs4_file, and can be protected with the more granular fi_lock. The fi_lock is already held when setting these fields. Make the code hold the fp->fi_lock when clearing the lease-related fields in the nfs4_file, and no longer require that the state_lock be held when calling into this function. To prevent lock inversion with the i_lock, we also move the vfs_setlease and fput calls outside of the fi_lock. This also sets us up for allowing vfs_setlease calls to block in the future. Finally, remove a redundant NULL pointer check. unhash_delegation_locked locks the fp->fi_lock prior to that check, so fp in that function must never be NULL. Signed-off-by: Jeff Layton <jlayton@primarydata.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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ef9b16dc6d
Коммит
6bcc034eac
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@ -673,15 +673,20 @@ nfs4_put_stid(struct nfs4_stid *s)
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static void nfs4_put_deleg_lease(struct nfs4_file *fp)
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{
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lockdep_assert_held(&state_lock);
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struct file *filp = NULL;
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struct file_lock *fl;
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if (!fp->fi_lease)
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return;
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if (atomic_dec_and_test(&fp->fi_delegees)) {
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vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
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spin_lock(&fp->fi_lock);
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if (fp->fi_lease && atomic_dec_and_test(&fp->fi_delegees)) {
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swap(filp, fp->fi_deleg_file);
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fl = fp->fi_lease;
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fp->fi_lease = NULL;
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fput(fp->fi_deleg_file);
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fp->fi_deleg_file = NULL;
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}
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spin_unlock(&fp->fi_lock);
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if (filp) {
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vfs_setlease(filp, F_UNLCK, &fl);
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fput(filp);
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}
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}
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@ -717,8 +722,7 @@ unhash_delegation_locked(struct nfs4_delegation *dp)
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list_del_init(&dp->dl_recall_lru);
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list_del_init(&dp->dl_perfile);
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spin_unlock(&fp->fi_lock);
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if (fp)
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nfs4_put_deleg_lease(fp);
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nfs4_put_deleg_lease(fp);
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}
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static void destroy_delegation(struct nfs4_delegation *dp)
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