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https://github.com/edk2-porting/linux-next.git
synced 2024-12-15 16:53:54 +08:00
[XFS] merge xfs_imap into xfs_dilocate
xfs_imap is the only caller of xfs_dilocate and doesn't add any significant value. Merge the two functions and document the various cases we have for inode cluster lookup in the new xfs_imap. Also remove the unused im_agblkno and im_ioffset fields from struct xfs_imap while we're at it. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <david@fromorbit.com> Signed-off-by: Niv Sardi <xaiki@sgi.com>
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a194189503
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@ -40,6 +40,7 @@
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#include "xfs_rtalloc.h"
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#include "xfs_error.h"
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#include "xfs_bmap.h"
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#include "xfs_imap.h"
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/*
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@ -1196,36 +1197,28 @@ error0:
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}
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/*
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* Return the location of the inode in bno/off, for mapping it into a buffer.
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* Return the location of the inode in imap, for mapping it into a buffer.
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*/
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/*ARGSUSED*/
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int
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xfs_dilocate(
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xfs_mount_t *mp, /* file system mount structure */
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xfs_trans_t *tp, /* transaction pointer */
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xfs_imap(
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xfs_mount_t *mp, /* file system mount structure */
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xfs_trans_t *tp, /* transaction pointer */
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xfs_ino_t ino, /* inode to locate */
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xfs_fsblock_t *bno, /* output: block containing inode */
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int *len, /* output: num blocks in inode cluster */
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int *off, /* output: index in block of inode */
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uint flags) /* flags concerning inode lookup */
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struct xfs_imap *imap, /* location map structure */
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uint flags) /* flags for inode btree lookup */
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{
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xfs_agblock_t agbno; /* block number of inode in the alloc group */
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xfs_buf_t *agbp; /* agi buffer */
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xfs_agino_t agino; /* inode number within alloc group */
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xfs_agnumber_t agno; /* allocation group number */
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int blks_per_cluster; /* num blocks per inode cluster */
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xfs_agblock_t chunk_agbno; /* first block in inode chunk */
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xfs_agino_t chunk_agino; /* first agino in inode chunk */
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__int32_t chunk_cnt; /* count of free inodes in chunk */
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xfs_inofree_t chunk_free; /* mask of free inodes in chunk */
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xfs_agblock_t cluster_agbno; /* first block in inode cluster */
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xfs_btree_cur_t *cur; /* inode btree cursor */
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int error; /* error code */
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int i; /* temp state */
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int offset; /* index of inode in its buffer */
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int offset_agbno; /* blks from chunk start to inode */
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ASSERT(ino != NULLFSINO);
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/*
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* Split up the inode number into its parts.
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*/
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@ -1240,20 +1233,20 @@ xfs_dilocate(
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return XFS_ERROR(EINVAL);
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if (agno >= mp->m_sb.sb_agcount) {
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xfs_fs_cmn_err(CE_ALERT, mp,
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"xfs_dilocate: agno (%d) >= "
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"xfs_imap: agno (%d) >= "
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"mp->m_sb.sb_agcount (%d)",
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agno, mp->m_sb.sb_agcount);
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}
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if (agbno >= mp->m_sb.sb_agblocks) {
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xfs_fs_cmn_err(CE_ALERT, mp,
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"xfs_dilocate: agbno (0x%llx) >= "
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"xfs_imap: agbno (0x%llx) >= "
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"mp->m_sb.sb_agblocks (0x%lx)",
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(unsigned long long) agbno,
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(unsigned long) mp->m_sb.sb_agblocks);
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}
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if (ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
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xfs_fs_cmn_err(CE_ALERT, mp,
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"xfs_dilocate: ino (0x%llx) != "
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"xfs_imap: ino (0x%llx) != "
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"XFS_AGINO_TO_INO(mp, agno, agino) "
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"(0x%llx)",
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ino, XFS_AGINO_TO_INO(mp, agno, agino));
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@ -1262,63 +1255,89 @@ xfs_dilocate(
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#endif /* DEBUG */
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return XFS_ERROR(EINVAL);
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}
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if ((mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp))) {
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/*
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* If the inode cluster size is the same as the blocksize or
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* smaller we get to the buffer by simple arithmetics.
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*/
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if (XFS_INODE_CLUSTER_SIZE(mp) <= mp->m_sb.sb_blocksize) {
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offset = XFS_INO_TO_OFFSET(mp, ino);
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ASSERT(offset < mp->m_sb.sb_inopblock);
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*bno = XFS_AGB_TO_FSB(mp, agno, agbno);
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*off = offset;
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*len = 1;
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imap->im_blkno = XFS_AGB_TO_DADDR(mp, agno, agbno);
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imap->im_len = XFS_FSB_TO_BB(mp, 1);
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imap->im_boffset = (ushort)(offset << mp->m_sb.sb_inodelog);
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return 0;
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}
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blks_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_blocklog;
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if (*bno != NULLFSBLOCK) {
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/*
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* If we get a block number passed from bulkstat we can use it to
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* find the buffer easily.
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*/
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if (imap->im_blkno) {
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offset = XFS_INO_TO_OFFSET(mp, ino);
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ASSERT(offset < mp->m_sb.sb_inopblock);
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cluster_agbno = XFS_FSB_TO_AGBNO(mp, *bno);
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*off = ((agbno - cluster_agbno) * mp->m_sb.sb_inopblock) +
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offset;
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*len = blks_per_cluster;
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cluster_agbno = XFS_DADDR_TO_AGBNO(mp, imap->im_blkno);
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offset += (agbno - cluster_agbno) * mp->m_sb.sb_inopblock;
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imap->im_len = XFS_FSB_TO_BB(mp, blks_per_cluster);
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imap->im_boffset = (ushort)(offset << mp->m_sb.sb_inodelog);
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return 0;
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}
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/*
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* If the inode chunks are aligned then use simple maths to
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* find the location. Otherwise we have to do a btree
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* lookup to find the location.
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*/
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if (mp->m_inoalign_mask) {
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offset_agbno = agbno & mp->m_inoalign_mask;
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chunk_agbno = agbno - offset_agbno;
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} else {
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xfs_btree_cur_t *cur; /* inode btree cursor */
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xfs_agino_t chunk_agino; /* first agino in inode chunk */
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__int32_t chunk_cnt; /* count of free inodes in chunk */
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xfs_inofree_t chunk_free; /* mask of free inodes in chunk */
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xfs_buf_t *agbp; /* agi buffer */
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int i; /* temp state */
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down_read(&mp->m_peraglock);
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error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
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up_read(&mp->m_peraglock);
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if (error) {
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#ifdef DEBUG
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xfs_fs_cmn_err(CE_ALERT, mp, "xfs_dilocate: "
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xfs_fs_cmn_err(CE_ALERT, mp, "xfs_imap: "
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"xfs_ialloc_read_agi() returned "
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"error %d, agno %d",
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error, agno);
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#endif /* DEBUG */
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return error;
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}
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cur = xfs_inobt_init_cursor(mp, tp, agbp, agno);
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if ((error = xfs_inobt_lookup_le(cur, agino, 0, 0, &i))) {
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#ifdef DEBUG
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xfs_fs_cmn_err(CE_ALERT, mp, "xfs_dilocate: "
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error = xfs_inobt_lookup_le(cur, agino, 0, 0, &i);
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if (error) {
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xfs_fs_cmn_err(CE_ALERT, mp, "xfs_imap: "
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"xfs_inobt_lookup_le() failed");
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#endif /* DEBUG */
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goto error0;
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}
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if ((error = xfs_inobt_get_rec(cur, &chunk_agino, &chunk_cnt,
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&chunk_free, &i))) {
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#ifdef DEBUG
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xfs_fs_cmn_err(CE_ALERT, mp, "xfs_dilocate: "
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error = xfs_inobt_get_rec(cur, &chunk_agino, &chunk_cnt,
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&chunk_free, &i);
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if (error) {
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xfs_fs_cmn_err(CE_ALERT, mp, "xfs_imap: "
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"xfs_inobt_get_rec() failed");
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#endif /* DEBUG */
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goto error0;
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}
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if (i == 0) {
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#ifdef DEBUG
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xfs_fs_cmn_err(CE_ALERT, mp, "xfs_dilocate: "
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xfs_fs_cmn_err(CE_ALERT, mp, "xfs_imap: "
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"xfs_inobt_get_rec() failed");
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#endif /* DEBUG */
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error = XFS_ERROR(EINVAL);
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}
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error0:
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xfs_trans_brelse(tp, agbp);
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xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
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if (error)
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@ -1326,19 +1345,35 @@ xfs_dilocate(
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chunk_agbno = XFS_AGINO_TO_AGBNO(mp, chunk_agino);
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offset_agbno = agbno - chunk_agbno;
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}
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ASSERT(agbno >= chunk_agbno);
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cluster_agbno = chunk_agbno +
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((offset_agbno / blks_per_cluster) * blks_per_cluster);
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offset = ((agbno - cluster_agbno) * mp->m_sb.sb_inopblock) +
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XFS_INO_TO_OFFSET(mp, ino);
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*bno = XFS_AGB_TO_FSB(mp, agno, cluster_agbno);
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*off = offset;
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*len = blks_per_cluster;
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imap->im_blkno = XFS_AGB_TO_DADDR(mp, agno, cluster_agbno);
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imap->im_len = XFS_FSB_TO_BB(mp, blks_per_cluster);
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imap->im_boffset = (ushort)(offset << mp->m_sb.sb_inodelog);
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/*
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* If the inode number maps to a block outside the bounds
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* of the file system then return NULL rather than calling
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* read_buf and panicing when we get an error from the
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* driver.
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*/
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if ((imap->im_blkno + imap->im_len) >
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XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)) {
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xfs_fs_cmn_err(CE_ALERT, mp, "xfs_imap: "
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"(imap->im_blkno (0x%llx) + imap->im_len (0x%llx)) > "
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" XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) (0x%llx)",
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(unsigned long long) imap->im_blkno,
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(unsigned long long) imap->im_len,
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XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks));
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return XFS_ERROR(EINVAL);
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}
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return 0;
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error0:
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xfs_trans_brelse(tp, agbp);
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xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
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return error;
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}
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/*
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@ -20,6 +20,7 @@
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struct xfs_buf;
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struct xfs_dinode;
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struct xfs_imap;
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struct xfs_mount;
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struct xfs_trans;
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@ -104,17 +105,14 @@ xfs_difree(
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xfs_ino_t *first_ino); /* first inode in deleted cluster */
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/*
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* Return the location of the inode in bno/len/off,
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* for mapping it into a buffer.
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* Return the location of the inode in imap, for mapping it into a buffer.
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*/
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int
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xfs_dilocate(
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xfs_imap(
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struct xfs_mount *mp, /* file system mount structure */
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struct xfs_trans *tp, /* transaction pointer */
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xfs_ino_t ino, /* inode to locate */
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xfs_fsblock_t *bno, /* output: block containing inode */
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int *len, /* output: num blocks in cluster*/
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int *off, /* output: index in block of inode */
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struct xfs_imap *imap, /* location map structure */
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uint flags); /* flags for inode btree lookup */
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/*
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@ -25,14 +25,7 @@
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typedef struct xfs_imap {
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xfs_daddr_t im_blkno; /* starting BB of inode chunk */
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uint im_len; /* length in BBs of inode chunk */
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xfs_agblock_t im_agblkno; /* logical block of inode chunk in ag */
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ushort im_ioffset; /* inode offset in block in "inodes" */
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ushort im_boffset; /* inode offset in block in bytes */
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} xfs_imap_t;
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struct xfs_mount;
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struct xfs_trans;
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int xfs_imap(struct xfs_mount *, struct xfs_trans *, xfs_ino_t,
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xfs_imap_t *, uint);
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#endif /* __XFS_IMAP_H__ */
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@ -266,7 +266,7 @@ xfs_inotobp(
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* in once, thus we can use the mapping information stored in the inode
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* rather than calling xfs_imap(). This allows us to avoid the overhead
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* of looking at the inode btree for small block file systems
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* (see xfs_dilocate()).
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* (see xfs_imap()).
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*/
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int
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xfs_itobp(
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@ -2508,64 +2508,6 @@ xfs_idata_realloc(
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ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork));
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}
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/*
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* Map inode to disk block and offset.
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*
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* mp -- the mount point structure for the current file system
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* tp -- the current transaction
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* ino -- the inode number of the inode to be located
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* imap -- this structure is filled in with the information necessary
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* to retrieve the given inode from disk
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* flags -- flags to pass to xfs_dilocate indicating whether or not
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* lookups in the inode btree were OK or not
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*/
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int
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xfs_imap(
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xfs_mount_t *mp,
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xfs_trans_t *tp,
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xfs_ino_t ino,
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xfs_imap_t *imap,
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uint flags)
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{
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xfs_fsblock_t fsbno;
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int len;
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int off;
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int error;
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fsbno = imap->im_blkno ?
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XFS_DADDR_TO_FSB(mp, imap->im_blkno) : NULLFSBLOCK;
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error = xfs_dilocate(mp, tp, ino, &fsbno, &len, &off, flags);
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if (error)
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return error;
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imap->im_blkno = XFS_FSB_TO_DADDR(mp, fsbno);
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imap->im_len = XFS_FSB_TO_BB(mp, len);
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imap->im_agblkno = XFS_FSB_TO_AGBNO(mp, fsbno);
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imap->im_ioffset = (ushort)off;
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imap->im_boffset = (ushort)(off << mp->m_sb.sb_inodelog);
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/*
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* If the inode number maps to a block outside the bounds
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* of the file system then return NULL rather than calling
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* read_buf and panicing when we get an error from the
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* driver.
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*/
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if ((imap->im_blkno + imap->im_len) >
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XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)) {
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xfs_fs_cmn_err(CE_ALERT, mp, "xfs_imap: "
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"(imap->im_blkno (0x%llx) + imap->im_len (0x%llx)) > "
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" XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) (0x%llx)",
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(unsigned long long) imap->im_blkno,
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(unsigned long long) imap->im_len,
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XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks));
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return EINVAL;
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}
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return 0;
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}
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void
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xfs_idestroy_fork(
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xfs_inode_t *ip,
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@ -157,7 +157,7 @@ typedef struct xfs_icdinode {
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#define XFS_IFEXTIREC 0x08 /* Indirection array of extent blocks */
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/*
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* Flags for xfs_inotobp, xfs_imap() and xfs_dilocate().
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* Flags for xfs_inotobp and xfs_imap().
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*/
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#define XFS_IMAP_BULKSTAT 0x1
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