Function Ext2SaveBuffer

Ext4Fsd/ext3/generic.c:882–947

BOOLEAN
Ext2SaveBuffer( IN PEXT2_IRP_CONTEXT    IrpContext,
                IN PEXT2_VCB            Vcb,
                IN LONGLONG             offset,
                IN ULONG                size,
                IN PVOID                buf )
{
    struct buffer_head *bh = NULL;
    BOOLEAN             rc = 0;

    __try {

        while (size) {

            sector_t    block;
            ULONG       len = 0, delta = 0;

            block = (sector_t) (offset >> BLOCK_BITS);
            delta = (ULONG)offset & (BLOCK_SIZE - 1);
            len = BLOCK_SIZE - delta;
            if (size < len)
                len = size;

            if (delta == 0 && len >= BLOCK_SIZE) {
                bh = sb_getblk_zero(&Vcb->sb, block);
            } else {
                bh = sb_getblk(&Vcb->sb, block);
            }

            if (!bh) {
                DEBUG(DL_ERR, ("Ext2SaveBuffer: can't load block %I64u\n", block));
                DbgBreak();
                __leave;
            }

            if (!buffer_uptodate(bh)) {
	            int err = bh_submit_read(bh);
	            if (err < 0) {
		            DEBUG(DL_ERR, ("Ext2SaveBuffer: bh_submit_read failed: %d\n", err));
		            __leave;
	            }
            }

            __try {
                RtlCopyMemory(bh->b_data + delta, buf, len);
                mark_buffer_dirty(bh);
            } __finally {
                fini_bh(&bh);
            }

            buf = (PUCHAR)buf + len;
            offset = offset + len;
            size = size - len;
        }

        rc = TRUE;

    } __finally {