Function Ext2ReadInode

Ext4Fsd/read.c:310–468

}

NTSTATUS
Ext2ReadInode (
    IN PEXT2_IRP_CONTEXT    IrpContext,
    IN PEXT2_VCB            Vcb,
    IN PEXT2_MCB            Mcb,
    IN ULONGLONG            Offset,
    IN PVOID                Buffer,
    IN ULONG                Size,
    IN BOOLEAN              bDirectIo,
    OUT PULONG              BytesRead
)
{
    PEXT2_EXTENT    Chain = NULL;
    PEXT2_EXTENT    Extent = NULL, Prev = NULL;

    IO_STATUS_BLOCK IoStatus;
    NTSTATUS        Status = STATUS_UNSUCCESSFUL;
    ULONG           RealSize ;

    if (BytesRead) {
        *BytesRead = 0;
    }

    __try {

        Ext2ReferMcb(Mcb);

        ASSERT((Mcb->Identifier.Type == EXT2MCB) &&
               (Mcb->Identifier.Size == sizeof(EXT2_MCB)));

        if ((Mcb->Identifier.Type != EXT2MCB) ||
                (Mcb->Identifier.Size != sizeof(EXT2_MCB))) {
            __leave;
        }

        if (Buffer == NULL && IrpContext != NULL)
            Buffer = Ext2GetUserBuffer(IrpContext->Irp);


        /* handle fast symlinks */
        if (S_ISLNK(Mcb->Inode.i_mode) && 0 == Mcb->Inode.i_blocks) {

            PUCHAR Data = (PUCHAR) (&Mcb->Inode.i_block[0]);
            if (!Buffer) {
                Status = STATUS_INSUFFICIENT_RESOURCES;
                __leave;
            }

            if (Offset < EXT2_LINKLEN_IN_INODE) {
                if ((ULONG)Offset + Size >= EXT2_LINKLEN_IN_INODE)
                    Size = EXT2_LINKLEN_IN_INODE - (ULONG)Offset - 1;
                RtlCopyMemory(Buffer, Data + (ULONG)Offset, Size);
                Status = STATUS_SUCCESS;
            } else {
                Status = STATUS_END_OF_FILE;
            }
            __leave;
        }