#include "scrub/xfile.h"
#include "scrub/xfarray.h"
#include "scrub/iscan.h"
+#include "scrub/orphanage.h"
#include "scrub/nlinks.h"
#include "scrub/trace.h"
#include "scrub/tempfile.h"
* inode is locked.
*/
+/* Set up to repair inode link counts. */
+int
+xrep_setup_nlinks(
+ struct xfs_scrub *sc)
+{
+ return xrep_orphanage_try_create(sc);
+}
+
+/*
+ * Inodes that aren't the root directory or the orphanage, have a nonzero link
+ * count, and no observed parents should be moved to the orphanage.
+ */
+static inline bool
+xrep_nlinks_is_orphaned(
+ struct xfs_scrub *sc,
+ struct xfs_inode *ip,
+ unsigned int actual_nlink,
+ const struct xchk_nlink *obs)
+{
+ struct xfs_mount *mp = ip->i_mount;
+
+ if (obs->parents != 0)
+ return false;
+ if (ip == mp->m_rootip || ip == sc->orphanage)
+ return false;
+ return actual_nlink != 0;
+}
+
/* Remove an inode from the unlinked list. */
STATIC int
xrep_nlinks_iunlink_remove(
struct xfs_inode *ip = sc->ip;
uint64_t total_links;
uint64_t actual_nlink;
+ bool orphanage_available = false;
bool dirty = false;
int error;
if (xrep_is_tempfile(ip))
return 0;
- xchk_ilock(sc, XFS_IOLOCK_EXCL);
+ /*
+ * If the filesystem has an orphanage attached to the scrub context,
+ * prepare for a link count repair that could involve @ip being adopted
+ * by the lost+found.
+ */
+ if (xrep_orphanage_can_adopt(sc)) {
+ error = xrep_orphanage_iolock_two(sc);
+ if (error)
+ return error;
+
+ error = xrep_adoption_trans_alloc(sc, &xnc->adoption);
+ if (error) {
+ xchk_iunlock(sc, XFS_IOLOCK_EXCL);
+ xrep_orphanage_iunlock(sc, XFS_IOLOCK_EXCL);
+ } else {
+ orphanage_available = true;
+ }
+ }
- error = xfs_trans_alloc(mp, &M_RES(mp)->tr_link, 0, 0, 0, &sc->tp);
- if (error)
- return error;
+ /*
+ * Either there is no orphanage or we couldn't allocate resources for
+ * that kind of update. Let's try again with only the resources we
+ * need for a simple link count update, since that's much more common.
+ */
+ if (!orphanage_available) {
+ xchk_ilock(sc, XFS_IOLOCK_EXCL);
+
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_link, 0, 0, 0,
+ &sc->tp);
+ if (error)
+ return error;
- xchk_ilock(sc, XFS_ILOCK_EXCL);
- xfs_trans_ijoin(sc->tp, ip, 0);
+ xchk_ilock(sc, XFS_ILOCK_EXCL);
+ xfs_trans_ijoin(sc->tp, ip, 0);
+ }
mutex_lock(&xnc->lock);
goto out_trans;
}
+ /*
+ * Decide if we're going to move this file to the orphanage, and fix
+ * up the incore link counts if we are.
+ */
+ if (orphanage_available &&
+ xrep_nlinks_is_orphaned(sc, ip, actual_nlink, &obs)) {
+ /* Figure out what name we're going to use here. */
+ error = xrep_adoption_compute_name(&xnc->adoption, &xnc->xname);
+ if (error)
+ goto out_trans;
+
+ /*
+ * Reattach this file to the directory tree by moving it to
+ * the orphanage per the adoption parameters that we already
+ * computed.
+ */
+ error = xrep_adoption_move(&xnc->adoption);
+ if (error)
+ goto out_trans;
+
+ /*
+ * Re-read the link counts since the reparenting will have
+ * updated our scan info.
+ */
+ mutex_lock(&xnc->lock);
+ error = xfarray_load_sparse(xnc->nlinks, ip->i_ino, &obs);
+ mutex_unlock(&xnc->lock);
+ if (error)
+ goto out_trans;
+
+ total_links = xchk_nlink_total(ip, &obs);
+ actual_nlink = VFS_I(ip)->i_nlink;
+ dirty = true;
+ }
+
/*
* If this inode is linked from the directory tree and on the unlinked
* list, remove it from the unlinked list.
xfs_trans_log_inode(sc->tp, ip, XFS_ILOG_CORE);
error = xrep_trans_commit(sc);
- xchk_iunlock(sc, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
- return error;
+ goto out_unlock;
out_scanlock:
mutex_unlock(&xnc->lock);
out_trans:
xchk_trans_cancel(sc);
- xchk_iunlock(sc, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+out_unlock:
+ xchk_iunlock(sc, XFS_ILOCK_EXCL);
+ if (orphanage_available) {
+ xrep_orphanage_iunlock(sc, XFS_ILOCK_EXCL);
+ xrep_orphanage_iunlock(sc, XFS_IOLOCK_EXCL);
+ }
+ xchk_iunlock(sc, XFS_IOLOCK_EXCL);
return error;
}
/*
* We need ftype for an accurate count of the number of child
* subdirectory links. Child subdirectories with a back link (dotdot
- * entry) but no forward link are unfixable, so we cannot repair the
- * link count of the parent directory based on the back link count
- * alone. Filesystems without ftype support are rare (old V4) so we
- * just skip out here.
+ * entry) but no forward link are moved to the orphanage, so we cannot
+ * repair the link count of the parent directory based on the back link
+ * count alone. Filesystems without ftype support are rare (old V4) so
+ * we just skip out here.
*/
if (!xfs_has_ftype(sc->mp))
return -EOPNOTSUPP;
DEFINE_XREP_PARENT_SALVAGE_EVENT(xrep_findparent_dirent);
DEFINE_XREP_PARENT_SALVAGE_EVENT(xrep_findparent_from_dcache);
+TRACE_EVENT(xrep_nlinks_set_record,
+ TP_PROTO(struct xfs_mount *mp, xfs_ino_t ino,
+ const struct xchk_nlink *obs),
+ TP_ARGS(mp, ino, obs),
+ TP_STRUCT__entry(
+ __field(dev_t, dev)
+ __field(xfs_ino_t, ino)
+ __field(xfs_nlink_t, parents)
+ __field(xfs_nlink_t, backrefs)
+ __field(xfs_nlink_t, children)
+ ),
+ TP_fast_assign(
+ __entry->dev = mp->m_super->s_dev;
+ __entry->ino = ino;
+ __entry->parents = obs->parents;
+ __entry->backrefs = obs->backrefs;
+ __entry->children = obs->children;
+ ),
+ TP_printk("dev %d:%d ino 0x%llx parents %u backrefs %u children %u",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ __entry->ino,
+ __entry->parents,
+ __entry->backrefs,
+ __entry->children)
+);
+
#endif /* IS_ENABLED(CONFIG_XFS_ONLINE_REPAIR) */
#endif /* _TRACE_XFS_SCRUB_TRACE_H */
projects / linux.git / commitdiff