/* * xfs_inval_cached_pages * * This routine is responsible for keeping direct I/O and buffered I/O * somewhat coherent. From here we make sure that we're at least * temporarily holding the inode I/O lock exclusively and then call * the page cache to flush and invalidate any cached pages. If there * are no cached pages this routine will be very quick. */ void xfs_inval_cached_pages( vnode_t *vp, xfs_iocore_t *io, xfs_off_t offset, int write, int relock) { xfs_mount_t *mp; if (!VN_CACHED(vp)) { return; } mp = io->io_mount; /* * We need to get the I/O lock exclusively in order * to safely invalidate pages and mappings. */ if (relock) { XFS_IUNLOCK(mp, io, XFS_IOLOCK_SHARED); XFS_ILOCK(mp, io, XFS_IOLOCK_EXCL); } /* Writing beyond EOF creates a hole that must be zeroed */ if (write && (offset > XFS_SIZE(mp, io))) { xfs_fsize_t isize; XFS_ILOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD); isize = XFS_SIZE(mp, io); if (offset > isize) { xfs_zero_eof(vp, io, offset, isize, offset); } XFS_IUNLOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD); } xfs_inval_cached_trace(io, offset, -1, ctooff(offtoct(offset)), -1); VOP_FLUSHINVAL_PAGES(vp, ctooff(offtoct(offset)), -1, FI_REMAPF_LOCKED); if (relock) { XFS_ILOCK_DEMOTE(mp, io, XFS_IOLOCK_EXCL); } }
STATIC int xfs_imap_to_bmap( xfs_iocore_t *io, xfs_off_t offset, xfs_bmbt_irec_t *imap, xfs_iomap_t *iomapp, int imaps, /* Number of imap entries */ int iomaps, /* Number of iomap entries */ int flags) { xfs_mount_t *mp; xfs_fsize_t nisize; int pbm; xfs_fsblock_t start_block; mp = io->io_mount; nisize = XFS_SIZE(mp, io); if (io->io_new_size > nisize) nisize = io->io_new_size; for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) { iomapp->iomap_offset = XFS_FSB_TO_B(mp, imap->br_startoff); iomapp->iomap_delta = offset - iomapp->iomap_offset; iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount); iomapp->iomap_flags = flags; if (io->io_flags & XFS_IOCORE_RT) { iomapp->iomap_flags |= IOMAP_REALTIME; iomapp->iomap_target = mp->m_rtdev_targp; } else { iomapp->iomap_target = mp->m_ddev_targp; } start_block = imap->br_startblock; if (start_block == HOLESTARTBLOCK) { iomapp->iomap_bn = IOMAP_DADDR_NULL; iomapp->iomap_flags |= IOMAP_HOLE; } else if (start_block == DELAYSTARTBLOCK) { iomapp->iomap_bn = IOMAP_DADDR_NULL; iomapp->iomap_flags |= IOMAP_DELAY; } else { iomapp->iomap_bn = XFS_FSB_TO_DB_IO(io, start_block); if (ISUNWRITTEN(imap)) iomapp->iomap_flags |= IOMAP_UNWRITTEN; } if ((iomapp->iomap_offset + iomapp->iomap_bsize) >= nisize) { iomapp->iomap_flags |= IOMAP_EOF; } offset += iomapp->iomap_bsize - iomapp->iomap_delta; } return pbm; /* Return the number filled */ }