diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_ag.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_ag.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c index 1ef8acf35e7d..b0c89f54d1bb 100644 --- a/fs/xfs/libxfs/xfs_ag.c +++ b/fs/xfs/libxfs/xfs_ag.c @@ -19,6 +19,8 @@ #include "xfs_ialloc.h" #include "xfs_rmap.h" #include "xfs_ag.h" +#include "xfs_ag_resv.h" +#include "xfs_health.h" static struct xfs_buf * xfs_get_aghdr_buf( @@ -461,3 +463,55 @@ xfs_ag_extend_space( len, &XFS_RMAP_OINFO_SKIP_UPDATE, XFS_AG_RESV_NONE); } + +/* Retrieve AG geometry. */ +int +xfs_ag_get_geometry( + struct xfs_mount *mp, + xfs_agnumber_t agno, + struct xfs_ag_geometry *ageo) +{ + struct xfs_buf *agi_bp; + struct xfs_buf *agf_bp; + struct xfs_agi *agi; + struct xfs_agf *agf; + struct xfs_perag *pag; + unsigned int freeblks; + int error; + + if (agno >= mp->m_sb.sb_agcount) + return -EINVAL; + + /* Lock the AG headers. */ + error = xfs_ialloc_read_agi(mp, NULL, agno, &agi_bp); + if (error) + return error; + error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agf_bp); + if (error) + goto out_agi; + pag = xfs_perag_get(mp, agno); + + /* Fill out form. */ + memset(ageo, 0, sizeof(*ageo)); + ageo->ag_number = agno; + + agi = XFS_BUF_TO_AGI(agi_bp); + ageo->ag_icount = be32_to_cpu(agi->agi_count); + ageo->ag_ifree = be32_to_cpu(agi->agi_freecount); + + agf = XFS_BUF_TO_AGF(agf_bp); + ageo->ag_length = be32_to_cpu(agf->agf_length); + freeblks = pag->pagf_freeblks + + pag->pagf_flcount + + pag->pagf_btreeblks - + xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE); + ageo->ag_freeblks = freeblks; + xfs_ag_geom_health(pag, ageo); + + /* Release resources. */ + xfs_perag_put(pag); + xfs_buf_relse(agf_bp); +out_agi: + xfs_buf_relse(agi_bp); + return error; +} |