From 7cd5006bdb6f6d9d9d7e68aa1d96b6e4a8b68bc5 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Fri, 12 Apr 2019 07:41:17 -0700 Subject: xfs: add a new ioctl to describe allocation group geometry Add a new ioctl to describe an allocation group's geometry. Signed-off-by: Darrick J. Wong Reviewed-by: Brian Foster --- fs/xfs/libxfs/xfs_ag.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_ag.h | 2 ++ fs/xfs/libxfs/xfs_fs.h | 14 ++++++++++++++ fs/xfs/xfs_ioctl.c | 24 +++++++++++++++++++++++ fs/xfs/xfs_ioctl32.c | 1 + 5 files changed, 93 insertions(+) diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c index 1ef8acf35e7d..1c0f2a6c10b4 100644 --- a/fs/xfs/libxfs/xfs_ag.c +++ b/fs/xfs/libxfs/xfs_ag.c @@ -19,6 +19,7 @@ #include "xfs_ialloc.h" #include "xfs_rmap.h" #include "xfs_ag.h" +#include "xfs_ag_resv.h" static struct xfs_buf * xfs_get_aghdr_buf( @@ -461,3 +462,54 @@ 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; + + /* Release resources. */ + xfs_perag_put(pag); + xfs_buf_relse(agf_bp); +out_agi: + xfs_buf_relse(agi_bp); + return error; +} diff --git a/fs/xfs/libxfs/xfs_ag.h b/fs/xfs/libxfs/xfs_ag.h index 412702e23f61..5166322807e7 100644 --- a/fs/xfs/libxfs/xfs_ag.h +++ b/fs/xfs/libxfs/xfs_ag.h @@ -26,5 +26,7 @@ struct aghdr_init_data { int xfs_ag_init_headers(struct xfs_mount *mp, struct aghdr_init_data *id); int xfs_ag_extend_space(struct xfs_mount *mp, struct xfs_trans *tp, struct aghdr_init_data *id, xfs_extlen_t len); +int xfs_ag_get_geometry(struct xfs_mount *mp, xfs_agnumber_t agno, + struct xfs_ag_geometry *ageo); #endif /* __LIBXFS_AG_H */ diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h index cb7d0b1453cd..ee33d628a240 100644 --- a/fs/xfs/libxfs/xfs_fs.h +++ b/fs/xfs/libxfs/xfs_fs.h @@ -267,6 +267,19 @@ typedef struct xfs_fsop_resblks { #define XFS_MIN_DBLOCKS(s) ((xfs_rfsblock_t)((s)->sb_agcount - 1) * \ (s)->sb_agblocks + XFS_MIN_AG_BLOCKS) +/* + * Output for XFS_IOC_AG_GEOMETRY + */ +struct xfs_ag_geometry { + uint32_t ag_number; /* i/o: AG number */ + uint32_t ag_length; /* o: length in blocks */ + uint32_t ag_freeblks; /* o: free space */ + uint32_t ag_icount; /* o: inodes allocated */ + uint32_t ag_ifree; /* o: inodes free */ + uint32_t ag_reserved32; /* o: zero */ + uint64_t ag_reserved[13];/* o: zero */ +}; + /* * Structures for XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG & XFS_IOC_FSGROWFSRT */ @@ -620,6 +633,7 @@ struct xfs_scrub_metadata { #define XFS_IOC_FREE_EOFBLOCKS _IOR ('X', 58, struct xfs_fs_eofblocks) /* XFS_IOC_GETFSMAP ------ hoisted 59 */ #define XFS_IOC_SCRUB_METADATA _IOWR('X', 60, struct xfs_scrub_metadata) +#define XFS_IOC_AG_GEOMETRY _IOWR('X', 61, struct xfs_ag_geometry) /* * ioctl commands that replace IRIX syssgi()'s diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index ec3c6c401ee7..b36abd453709 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -33,6 +33,7 @@ #include "xfs_fsmap.h" #include "scrub/xfs_scrub.h" #include "xfs_sb.h" +#include "xfs_ag.h" #include #include @@ -804,6 +805,26 @@ xfs_ioc_fsgeometry( return 0; } +STATIC int +xfs_ioc_ag_geometry( + struct xfs_mount *mp, + void __user *arg) +{ + struct xfs_ag_geometry ageo; + int error; + + if (copy_from_user(&ageo, arg, sizeof(ageo))) + return -EFAULT; + + error = xfs_ag_get_geometry(mp, ageo.ag_number, &ageo); + if (error) + return error; + + if (copy_to_user(arg, &ageo, sizeof(ageo))) + return -EFAULT; + return 0; +} + /* * Linux extended inode flags interface. */ @@ -1930,6 +1951,9 @@ xfs_file_ioctl( case XFS_IOC_FSGEOMETRY: return xfs_ioc_fsgeometry(mp, arg, 5); + case XFS_IOC_AG_GEOMETRY: + return xfs_ioc_ag_geometry(mp, arg); + case XFS_IOC_GETVERSION: return put_user(inode->i_generation, (int __user *)arg); diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c index 55ace6308637..65997a6315e9 100644 --- a/fs/xfs/xfs_ioctl32.c +++ b/fs/xfs/xfs_ioctl32.c @@ -563,6 +563,7 @@ xfs_file_compat_ioctl( case XFS_IOC_DIOINFO: case XFS_IOC_FSGEOMETRY_V4: case XFS_IOC_FSGEOMETRY: + case XFS_IOC_AG_GEOMETRY: case XFS_IOC_FSGETXATTR: case XFS_IOC_FSSETXATTR: case XFS_IOC_FSGETXATTRA: -- cgit v1.2.3