xfs: various fixes for 6.2 This is an assorted collection of bug fixes that have been bundled together. The first patch fixes a metadump corruption vector resulting from a three-way race between a slow-running blkid process, the kernel mounting, changing, and unmounting the fs, and xfs_db reading stale block device pagecache contents. The middle two patches address gcc warnings. The final patch fixes a subtle corruption bug wherein making a delalloc reservation on a filesystem with quotas enabled would sample the data mapping, try to attach dquots, unlock the inode to attach the dquots, relock the inode, and fail to reverify the sampled data. If another process updated the data mapping while the inode was unlocked, the reservation would proceed with stale data and corrupt the data fork. Signed-off-by: Darrick J. Wong <djwong@kernel.org>