This checkin adds support in ufs/ffs for the FS_NEEDSFSCK flag.

It is described in ufs/ffs/fs.h as follows:

/*
 * Filesystem flags.
 *
 * Note that the FS_NEEDSFSCK flag is set and cleared only by the
 * fsck utility. It is set when background fsck finds an unexpected
 * inconsistency which requires a traditional foreground fsck to be
 * run. Such inconsistencies should only be found after an uncorrectable
 * disk error. A foreground fsck will clear the FS_NEEDSFSCK flag when
 * it has successfully cleaned up the filesystem. The kernel uses this
 * flag to enforce that inconsistent filesystems be mounted read-only.
 */
#define FS_UNCLEAN    0x01	/* filesystem not clean at mount */
#define FS_DOSOFTDEP  0x02	/* filesystem using soft dependencies */
#define FS_NEEDSFSCK  0x04	/* filesystem needs sync fsck before mount */

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