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xfs: introduce fake roots for ag-rooted btrees

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Create an in-core fake root for AG-rooted btree types so that callers
can generate a whole new btree using the upcoming btree bulk load
function without making the new tree accessible from the rest of the
filesystem.  It is up to the individual btree type to provide a function
to create a staged cursor (presumably with the appropriate callouts to
update the fakeroot) and then commit the staged root back into the
filesystem.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong
2020-03-11 10:40:26 -07:00
parent 608eb3cee7
commit e06536a692
7 changed files with 249 additions and 1 deletions
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11
fs/xfs/libxfs/xfs_btree.h
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@@ -179,7 +179,10 @@ union xfs_btree_irec {
/* Per-AG btree information. */
struct xfs_btree_cur_ag {
struct xfs_buf *agbp;
union {
struct xfs_buf *agbp;
struct xbtree_afakeroot *afake; /* for staging cursor */
};
xfs_agnumber_t agno;
union {
struct {
@@ -238,6 +241,12 @@ typedef struct xfs_btree_cur
#define XFS_BTREE_LASTREC_UPDATE (1<<2) /* track last rec externally */
#define XFS_BTREE_CRC_BLOCKS (1<<3) /* uses extended btree blocks */
#define XFS_BTREE_OVERLAPPING (1<<4) /* overlapping intervals */
/*
* The root of this btree is a fakeroot structure so that we can stage a btree
* rebuild without leaving it accessible via primary metadata. The ops struct
* is dynamically allocated and must be freed when the cursor is deleted.
*/
#define XFS_BTREE_STAGING (1<<5)
#define XFS_BTREE_NOERROR 0