int xfs_readfile_btree(xfs_inode_t *ip, void *buffer, off_t offset, size_t len, int *last_extent) {
xfs_extnum_t nextents;
xfs_extnum_t extent;
xfs_ifork_t *dp;
xfs_bmbt_rec_host_t *ep;
xfs_bmbt_irec_t rec;
xfs_mount_t *mp = ip->i_mount; /* filesystem mount point */
xfs_fsize_t size = ip->i_d.di_size;
int error;
if (offset >= size) return 0;
if (offset + len > size)
len = size - offset;
dp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
if (!(dp->if_flags & XFS_IFEXTENTS) &&
(error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
return error;
nextents = XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK);
for (extent=0; extent<nextents; extent++) {
ep = xfs_iext_get_ext(dp, extent);
xfs_bmbt_get_all(ep, &rec);
if (extent_overlaps_buffer(mp, rec, offset, len)) {
error = copy_extent_to_buffer(mp, rec, buffer, offset, len);
if (error) return error;
}
}
return len;
}
/*
* Count leaf blocks given a range of extent records.
*/
STATIC void
xfs_bmap_count_leaves(
xfs_ifork_t *ifp,
xfs_extnum_t idx,
int numrecs,
int *count)
{
int b;
for (b = 0; b < numrecs; b++) {
xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, idx + b);
*count += xfs_bmbt_get_blockcount(frp);
}
}
STATIC int
xfs_qm_get_rtblks(
xfs_inode_t *ip,
xfs_qcnt_t *O_rtblks)
{
xfs_filblks_t rtblks; /* total rt blks */
xfs_extnum_t idx; /* extent record index */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_extnum_t nextents; /* number of extent entries */
int error;
ASSERT(XFS_IS_REALTIME_INODE(ip));
ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
return error;
}
rtblks = 0;
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
for (idx = 0; idx < nextents; idx++)
rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
*O_rtblks = (xfs_qcnt_t)rtblks;
return 0;
}
